CN113258800B - Bidirectional power supply equipment, power supply control method and device - Google Patents

Bidirectional power supply equipment, power supply control method and device Download PDF

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Publication number
CN113258800B
CN113258800B CN202110803680.0A CN202110803680A CN113258800B CN 113258800 B CN113258800 B CN 113258800B CN 202110803680 A CN202110803680 A CN 202110803680A CN 113258800 B CN113258800 B CN 113258800B
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triode
current voltage
capacitor
ripple
direct
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CN113258800A (en
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张勇
魏学海
吴斌
陈炎坤
甘旭
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Shenzhen Lorentz Technology Co ltd
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Shenzhen Lorentz Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention provides a bidirectional power supply device, a power supply control method and a power supply control device, which relate to the technical field of power electronics and comprise the following steps: the AC/DC conversion device, the resonance conversion circuit and the synchronous rectification circuit are connected in sequence; the resonance transformation circuit comprises at least two resonance networks which are connected with each other; the alternating current-direct current conversion device is used for receiving three-phase alternating current voltage provided by external equipment and converting the three-phase alternating current voltage into first direct current voltage; the resonance conversion circuit is used for inverting the first direct-current voltage into a target alternating-current voltage in a mode of carrying out staggered wave sending on at least two mutually connected resonance networks; the synchronous rectification circuit is used for rectifying the target alternating-current voltage into a second direct-current voltage. The invention does not need to be externally connected with a large number of capacitors, has simple structural design, effectively reduces the ripple of the second direct current voltage, and greatly improves the overall performance of the bidirectional power supply equipment.

Description

Bidirectional power supply equipment, power supply control method and device
Technical Field
The invention relates to the technical field of power electronics, in particular to bidirectional power supply equipment, a power supply control method and a power supply control device.
Background
The existing bidirectional power supply equipment mostly adopts unidirectional alternating current input, and has the following obvious defects: (1) because of the unidirectional ac input, there is inevitably a large zero line current in the system. The transformer is prone to serious heating due to the fact that the zero line point is too large, the transformer can be burnt out due to too long time, and great potential safety hazards exist. (2) Most of the current application occasions are three-phase alternating current power distribution, when a plurality of existing bidirectional power supply devices are used in parallel, the power supply power of each phase needs to be calculated and configured, the load power of a three-phase alternating current input end is balanced as much as possible, and the zero line current of the alternating current input end is reduced. But this configuration is complicated and it is difficult to ensure true three-phase balance. (3) The existing bidirectional power supply equipment has a power frequency ripple wave of about 100HZ at a direct current bus end due to the self-topology, the amplitude is large, the power frequency ripple wave can further influence the output end ripple wave of a post converter, and the power supply performance is poor.
The existing scheme mostly reduces ripples of a direct current output end of a power supply in a mode of externally connecting a large number of capacitors to the direct current output end of bidirectional power supply equipment, the method is high in cost, the dynamic effect of the power supply is influenced by the large number of externally connected capacitors, other problems are easily introduced into the method, and more limitations are caused in practical use.
Disclosure of Invention
The invention aims to provide bidirectional power supply equipment, a power supply control method and a power supply control device, and aims to solve the technical problems that in the prior art, the cost of an external large number of capacitors is high, the application scene is limited, and the performance of a power supply is poor.
In a first aspect, the present invention provides a bidirectional power supply device, including: the AC/DC conversion device, the resonance conversion circuit and the synchronous rectification circuit are connected in sequence; the resonant transformation circuit comprises at least two resonant networks which are connected with each other; the alternating current-direct current conversion device is used for receiving three-phase alternating current voltage provided by external equipment and converting the three-phase alternating current voltage into first direct current voltage; wherein a ripple of the first direct-current voltage is lower than a ripple of the three-phase alternating-current voltage; the resonance conversion circuit is used for inverting the first direct-current voltage into a target alternating-current voltage in a mode of carrying out staggered wave sending on the at least two mutually connected resonance networks; wherein a ripple of the target alternating-current voltage is lower than a ripple of the first direct-current voltage; the synchronous rectification circuit is used for rectifying the target alternating-current voltage into a second direct-current voltage; wherein a ripple of the second direct current voltage is lower than a ripple of the target alternating current voltage.
Further, the ac-dc conversion device includes a target power conversion topology circuit, and the target power conversion topology circuit includes: a two-level topology circuit, a three-level topology circuit, or a custom topology circuit.
Further, the three-level topology circuit includes: the circuit comprises an input circuit, a first element device group, a second element device group, a third element device group and a capacitor group; the input circuit is connected with the first element device group, the second element device group, the third element device group and the resonance transformation circuit; the first component group comprises a first triode, a second triode, a third triode and a fourth triode which are connected in sequence, and further comprises a first diode and a second diode, one end of the first diode is connected with a node between the first triode and the second triode, the other end of the first diode is connected with one end of the second diode, and the other end of the second diode is connected with a node between the third triode and the fourth triode; the second component group comprises a fifth triode, a sixth triode, a seventh triode and an eighth triode which are sequentially connected, and further comprises a third diode and a fourth diode, wherein one end of the third diode is connected with a node between the fifth triode and the sixth triode, the other end of the third diode is connected with one end of the fourth diode, and the other end of the fourth diode is connected with a node between the seventh triode and the eighth triode; the third component group comprises a ninth triode, a thirteenth triode, an eleventh triode and a twelfth triode which are sequentially connected, and further comprises a fifth diode and a sixth diode, one end of the fifth diode is connected with a node between the ninth triode and the thirteenth triode, the other end of the fifth diode is connected with one end of the sixth diode, and the other end of the sixth diode is connected with a node between the eleventh triode and the twelfth triode; the input circuit comprises a first sub-input circuit, a second sub-input circuit and a third sub-input circuit; the first sub-input circuit comprises a first port, a first inductor and a first capacitor, one end of the first port is connected with a first alternating-current voltage in the three-phase alternating-current voltages, the other end of the first port is connected with one end of the first inductor, the other end of the first inductor is connected with a node between the second triode and the third triode, the other end of the first port is further connected with one end of the first capacitor, and the other end of the first capacitor is connected with the resonance conversion circuit; the second sub-input circuit comprises a second port, a second inductor and a second capacitor, one end of the second port is connected with a second-phase alternating-current voltage in the three-phase alternating-current voltages, the other end of the second port is connected with one end of the second inductor, the other end of the second inductor is connected with a node between the sixth triode and the seventh triode, the other end of the second port is also connected with one end of the second capacitor, and the other end of the second capacitor is connected with the resonance conversion circuit; the third sub-input circuit comprises a third port, a third inductor and a third capacitor, one end of the third port is connected with a third alternating-current voltage in the three-phase alternating-current voltages, the other end of the third port is connected with one end of the third inductor, the other end of the third inductor is connected with a node between the thirteenth triode and the eleventh triode, the other end of the third port is further connected with one end of the third capacitor, and the other end of the third capacitor is connected with the resonance conversion circuit.
Further, when the number of the resonant networks is two, the two interconnected resonant networks include a first resonant network and a second resonant network; the first resonant network comprises: a thirteenth triode, a fourteenth triode, a fifteenth triode, a sixteenth triode, a fourth inductor, a fourth capacitor, a sixth capacitor and a first transformer; the second resonant network comprises: the seventeenth triode, the eighteenth triode, the nineteenth triode, the twentieth triode, the fifth inductor, the fifth capacitor, the seventh capacitor and the second transformer; one end of the fourth capacitor is connected with one end of the ninth triode, and the other end of the fourth capacitor is connected with one end of the fifth capacitor; one end of the fourth capacitor is further connected with one end of the thirteenth triode, the other end of the thirteenth triode is connected with one end of the fourteenth triode, the other end of the fourteenth triode is connected with the other end of the fourth capacitor, one end of the fifteenth triode is connected with one end of the thirteenth triode, the other end of the fifteenth triode is connected with one end of the sixteenth triode, the other end of the sixteenth triode is connected with the other end of the fourth capacitor, one end of the fourth inductor is connected with a node between the thirteenth triode and the fourteenth triode, the other end of the fourth inductor is connected with one end of the sixth capacitor, the other end of the sixth capacitor is connected with one end of the first transformer, the other end of the first transformer is connected with a node between the fifteenth triode and the sixteenth triode; the other end of the fifth capacitor is connected with the other end of the twelfth triode, one end of the fifth capacitor is further connected with one end of the seventeenth triode, the other end of the seventeenth triode is connected with one end of the eighteenth triode, the other end of the eighteenth triode is connected with the other end of the fifth capacitor, one end of the nineteenth triode is connected with one end of the seventeenth triode, the other end of the nineteenth triode is connected with one end of the twentieth triode, the other end of the twentieth triode is connected with the other end of the fifth capacitor, one end of the fifth inductor is connected with a node between the seventeenth triode and the eighteenth triode, the other end of the fifth inductor is connected with one end of the seventh capacitor, and the other end of the seventh capacitor is connected with one end of a second transformer, the other end of the second transformer is connected with a node between the nineteenth triode and the twentieth triode.
Further, the synchronous rectification circuit includes: a twenty-first triode, a twenty-second triode, a twenty-third triode, a twenty-fourth triode and an eighth capacitor; one end of the twenty-first triode is connected with the first transformer, one end of the twenty-second triode is connected with the first transformer, and the other end of the twenty-first triode is connected with the other end of the twenty-second triode; one end of the twenty-third triode is connected with the second transformer, one end of the twenty-fourth triode is connected with the second transformer, and the other end of the twenty-third triode is connected with the other end of the twenty-fourth triode; the twenty-second triode is also connected with the other end of the twenty-fourth triode; one end of the eighth capacitor is connected with a node between the first transformer and the second transformer; the other end of the eighth capacitor is connected with a node between the twenty-second triode and the twenty-fourth triode.
Further, the staggered wave sending mode is as follows: the wave-sending phase of the first resonant network is different from the wave-sending phase of the second resonant network by 90 degrees.
In a second aspect, the present invention provides a power control method, which is applied to the bidirectional power supply device according to the first aspect, and includes: receiving three-phase alternating-current voltage provided by external equipment, and converting the three-phase alternating-current voltage into first direct-current voltage; wherein a ripple of the first direct-current voltage is lower than a ripple of the three-phase alternating-current voltage; inverting the first direct-current voltage into a target alternating-current voltage by adopting a staggered wave-sending mode; wherein a ripple of the target alternating-current voltage is lower than a ripple of the first direct-current voltage; rectifying the target alternating-current voltage into a second direct-current voltage; wherein a ripple of the second direct current voltage is lower than a ripple of the target alternating current voltage.
In a third aspect, the present invention provides a power control apparatus, which is applied to the bidirectional power supply device of the first aspect, including: the receiving and converting module is used for receiving three-phase alternating-current voltage provided by external equipment and converting the three-phase alternating-current voltage into first direct-current voltage; wherein a ripple of the first direct-current voltage is lower than a ripple of the three-phase alternating-current voltage; the inversion module is used for inverting the first direct-current voltage into a target alternating-current voltage in a staggered wave-sending mode; wherein a ripple of the target alternating-current voltage is lower than a ripple of the first direct-current voltage; the rectifying module is used for rectifying the target alternating-current voltage into a second direct-current voltage; wherein a ripple of the second direct current voltage is lower than a ripple of the target alternating current voltage.
In a fourth aspect, the present invention further provides an electronic device, including a memory and a processor, where the memory stores a computer program operable on the processor, and the processor executes the computer program to implement the steps of the power control method.
In a fifth aspect, the present invention also provides a computer readable medium having non-volatile program code executable by a processor, wherein the program code causes the processor to execute the power control method.
The invention provides a bidirectional power supply device, a power supply control method and a power supply control device, which comprise: the AC/DC conversion device, the resonance conversion circuit and the synchronous rectification circuit are connected in sequence; the resonance transformation circuit comprises at least two resonance networks which are connected with each other; the alternating current-direct current conversion device is used for receiving three-phase alternating current voltage provided by external equipment and converting the three-phase alternating current voltage into first direct current voltage; wherein, the ripple of the first direct current voltage is lower than the ripple of the three-phase alternating current voltage; the resonance conversion circuit is used for inverting the first direct-current voltage into a target alternating-current voltage in a mode of carrying out staggered wave sending on at least two mutually connected resonance networks; wherein the ripple of the target alternating-current voltage is lower than the ripple of the first direct-current voltage; the synchronous rectification circuit is used for rectifying the target alternating-current voltage into a second direct-current voltage; wherein the ripple of the second DC voltage is lower than the ripple of the target AC voltage.
The invention does not need to be externally connected with a large number of capacitors, structurally redesigns bidirectional power supply equipment, and the bidirectional power supply equipment comprises an alternating current-direct current conversion device, a resonance conversion circuit and a synchronous rectification circuit which can reduce the ripple of output voltage. The bidirectional power supply equipment is simple in structural design, ripples of the second direct-current voltage are effectively reduced, and meanwhile the overall performance of the bidirectional power supply equipment is greatly improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a bidirectional power supply device according to an embodiment of the present invention;
fig. 2 is a schematic diagram comparing a three-phase PFC bus voltage ripple and a single-phase PFC bus voltage ripple;
fig. 3 is a schematic structural diagram of an ac-dc conversion device;
FIG. 4 is a schematic diagram of the resonant inverter circuit and the synchronous rectifier circuit;
fig. 5 is a schematic diagram of the staggered wave-emitting timing of the thirteenth transistor VT41 and the seventeenth transistor VT 51;
fig. 6 is a flowchart of a power control method according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a power control apparatus according to an embodiment of the present invention.
Icon:
10-ac-dc conversion device; 20-a resonant conversion circuit; 21-a first resonant network; 22-a second resonant network; 30-a synchronous rectification circuit; 71-a reception conversion module; 72-an inverter module; 73-rectifying module.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Most of the existing bidirectional power supply equipment adopts a single-phase alternating current input mode. Since this approach has a neutral access, there is inevitably a large zero current in the system. When the current of the zero line is too large, the power transformer can be heated seriously, and the transformer can be burnt out if the time is too long, so that great potential safety hazards exist. In addition, the existing single-phase alternating-current input bidirectional power supply equipment has the following obvious disadvantages: (1) the power of a single power supply is low, and a plurality of power supplies are needed to be used in parallel in high-power application occasions. (2) In practical use, most of industrial power distribution is three-phase alternating current power distribution, and when a plurality of existing single-phase alternating current input power supplies (namely, existing bidirectional power supply equipment) are used in parallel, the power of each phase needs to be calculated and configured, and the load power of the three-phase alternating current input end needs to be balanced as much as possible, so that the zero line current of the alternating current input end is reduced. This configuration is complicated and it is difficult to ensure true three-phase balance. That is, in most of the current applications, the load of each phase is balanced as much as possible in the three-phase power supply to achieve approximate balance of the three-phase load, and at this time, the system configuration is not flexible enough, and the configuration is complicated, so that it is difficult to prevent the occurrence of abnormal situations. (3) Due to the topology of the existing single-phase alternating-current input power supply, a power-frequency ripple voltage of about 100HZ inevitably exists at the end of a direct-current bus, and the amplitude is large. The power frequency ripple further affects the output end ripple of the post-stage dc converter.
In the high-power application of the bidirectional power supply equipment, in order to reduce the ripple of the dc output end as much as possible and improve the voltage stabilization precision of the dc output end, the current scheme is to connect a large number of capacitors to the dc output end of the bidirectional power supply equipment to reduce the ripple of the dc output end. The method is high in cost, a large number of external capacitors can influence the dynamic effect of the power supply, other problems are introduced while the direct-current output ripple of the power supply is reduced, and more limitations are generated in practical use.
Therefore, the invention aims to provide a bidirectional power supply device, a power supply control method and a power supply control device, which not only have simple structural design for the bidirectional power supply device, but also greatly improve the overall performance of the bidirectional power supply device while effectively reducing the ripple of the second direct-current voltage.
For the convenience of understanding the present embodiment, a bidirectional power supply device disclosed in the present embodiment will be described in detail first.
Example 1:
fig. 1 is a schematic structural diagram of a bidirectional power supply device according to an embodiment of the present invention. From the connection structure, as shown in fig. 1, the bidirectional power supply apparatus includes: the AC-DC conversion device 10, the resonance conversion circuit 20 and the synchronous rectification circuit 30 are connected in sequence; the resonant conversion circuit 20 comprises at least two interconnected resonant networks. When the number of the resonant networks is two, it is referred to as a first resonant network 21 and a second resonant network 22, respectively.
The following analyses were performed functionally from the elements: the ac-dc conversion device 10 is configured to receive a three-phase ac voltage provided by an external device, and convert the three-phase ac voltage into a first dc voltage; wherein, the ripple of the first direct current voltage is lower than the ripple of the three-phase alternating current voltage; the resonant conversion circuit 20 is configured to invert the first direct-current voltage into a target alternating-current voltage by performing interleaved wave sending on at least two mutually connected resonant networks; wherein the ripple of the target alternating-current voltage is lower than the ripple of the first direct-current voltage; the synchronous rectification circuit 30 is configured to rectify the target ac voltage into a second dc voltage; wherein the ripple of the second DC voltage is lower than the ripple of the target AC voltage.
The AC/DC conversion device 10 may be referred to as an AC/DC device, and is essentially a device that converts AC power into DC power. The ripple of the first DC voltage output by the AC/DC device may be referred to as a power frequency ripple. The resonant conversion circuit 20 may be referred to as an LLC resonant conversion circuit, or as an LLC resonant network conversion topology. The ripple of the second dc voltage output from the synchronous rectification circuit 30 may be referred to as a high-frequency ripple. The following analysis can also be performed functionally from the elements: the AC/DC device is configured to convert an input three-phase AC voltage into a high-voltage DC (i.e., the first DC voltage) with a low power-frequency ripple through a target power conversion topology circuit described below, and output the high-voltage DC. The resonant converter circuit 20 converts the high-voltage dc into a low-voltage high-frequency voltage (i.e., the target ac voltage) through the connection scheme and power topology shown in fig. 4 and outputs the low-voltage high-frequency voltage. The resonant converter circuit 20 requires the use of high frequency transformers (e.g., T1, T2 in fig. 4) to achieve energy transfer and electrical isolation between the high and low voltage sides during power conversion. The synchronous rectification circuit 30 rectifies the low-voltage high-frequency voltage into a dc voltage (i.e., the second dc voltage) and outputs the dc voltage, and realizes a single-output with low ripple by the connection mode and the control method of the synchronous rectification circuit 30 in fig. 4. Since the power flows of the ac/dc conversion device 10, the resonant conversion circuit 20, and the synchronous rectification circuit 30 can all flow in two directions, the function of a bidirectional power supply can be realized by a corresponding switching control method.
As shown in fig. 2, the three-phase PFC bus voltage ripple Y1 is significantly less than the single-phase PFC bus voltage ripple Y0. In view of the above drawbacks of the existing single-phase ac input power supply, an embodiment of the present invention provides a bidirectional power supply apparatus, which is a low-ripple and high-power bidirectional power supply apparatus based on three-phase ac input. Because the bidirectional power supply equipment provided by the embodiment of the invention is three-phase alternating current input, the problems of large zero line current, serious heating of a power transformer, over-small power supply and complex system configuration of a single-phase alternating current input power supply can be effectively solved. That is to say, the embodiment of the invention can effectively reduce the difficulty of system configuration and effectively reduce the problem of zero line current in practical application. Meanwhile, in the application of the bidirectional power supply equipment, the ripple of the direct current output end is an important index of the bidirectional power supply, and the embodiment of the invention can effectively reduce the ripple of the second direct current voltage at the output end (which can be understood as the direct current output end) of the synchronous rectification circuit 30 and greatly improve the overall performance of the bidirectional power supply equipment.
In an alternative embodiment, ac-dc converter 10 includes a target power conversion topology, which includes: a two-level topology circuit, a three-level topology circuit, or a custom topology circuit. That is, the target power conversion topology circuit includes, but is not limited to, a two-level topology, a three-level topology, or other PFC architecture.
The target power conversion topology circuit may be referred to as a PFC power factor correction circuit. The ac-dc converter 10 has a main function of converting a three-phase ac input into a high-voltage dc voltage with a low power frequency ripple through a two-level or three-level topology circuit, where the dc voltage may also be referred to as a first bus voltage in the embodiment of the present invention.
In an alternative embodiment, as shown in fig. 3, a three-level topology circuit includes: the circuit comprises an input circuit, a first element device group, a second element device group, a third element device group and a capacitor group; the input circuit is connected with the first element device group, the second element device group, the third element device group and the resonance conversion circuit 20;
as shown in fig. 3, the first component group includes a first triode VT11, a second triode VT12, a third triode VT13, a fourth triode VT14, a first diode VD11 and a second diode VD12, which are connected in sequence, one end of the first diode VD11 is connected to a node between the first triode VT11 and the second triode VT12, the other end of the first diode VD11 is connected to one end of the second diode VD12, and the other end of the second diode VD12 is connected to a node between the third triode VT13 and the fourth triode VT 14;
as shown in fig. 3, the structure of the second component device group is similar to that of the first component device group, and includes a fifth triode VT21, a sixth triode VT22, a seventh triode VT23, an eighth triode VT24, a third diode VD21 and a fourth diode VD22, which are connected in sequence, one end of the third diode VD21 is connected to a node between the fifth triode VT21 and the sixth triode VT22, the other end of the third diode VD21 is connected to one end of the fourth diode VD22, and the other end of the fourth diode VD22 is connected to a node between the seventh triode VT23 and the eighth triode VT 24;
as shown in fig. 3, the third component device group also has a structure similar to that of the first component device group, and includes a ninth triode VT31, a thirteenth triode VT32, an eleventh triode VT33, and a twelfth triode VT34, which are connected in sequence, and further includes a fifth diode VD31 and a sixth diode VD32, one end of the fifth diode VD31 is connected to a node between the ninth triode VT31 and the thirteenth triode VT32, the other end of the fifth diode VD31 is connected to one end of the sixth diode VD32, and the other end of the sixth diode VD32 is connected to a node between the eleventh triode VT33 and the twelfth triode VT 34;
the input circuit comprises a first sub-input circuit, a second sub-input circuit and a third sub-input circuit, and the three sub-input circuits are similar in structure. As shown in fig. 3, the first sub-input circuit includes a first port a, a first inductor L1 and a first capacitor C1, one end of the first port a is connected to a first phase alternating current voltage of the three-phase alternating current voltages, the other end of the first port a is connected to one end of a first inductor L1, the other end of the first inductor L1 is connected to a node between the second transistor VT12 and the third transistor VT13, the other end of the first port a is further connected to one end of a first capacitor C1, and the other end of the first capacitor C1 is connected to the resonance converting circuit 20;
the second sub-input circuit comprises a second port B, a second inductor L2 and a second capacitor C2, wherein one end of the second port B is connected with a second-phase alternating-current voltage in the three-phase alternating-current voltages, the other end of the second port B is connected with one end of a second inductor L2, the other end of the second inductor L2 is connected with a node between a sixth triode VT22 and a seventh triode VT23, the other end of the second port B is also connected with one end of a second capacitor C2, and the other end of the second capacitor C2 is connected with the resonance transformation circuit 20;
the third sub-input circuit comprises a third port C, a third inductor L3 and a third capacitor C3, wherein one end of the third port C is connected with a third alternating-current voltage in the three-phase alternating-current voltages, the other end of the third port C is connected with one end of a third inductor L3, the other end of the third inductor L3 is connected with a node between a thirteenth diode VT32 and an eleventh diode VT33, the other end of the third port C is further connected with one end of a third capacitor C3, and the other end of the third capacitor C3 is connected with the resonance transformation circuit 20.
With reference to fig. 1 and fig. 3, taking a three-level topology as an example, a certain phase of three-phase ac input is selected as an example to perform the following specific analysis on the ac/dc conversion device 10:
taking the a-phase rectification as an example, when the a-phase sine wave ac input is positive half cycle, the first transistor VT11 and the third transistor VT13 are switched on, the second transistor VT12 is normally on, and the fourth transistor VT14 is normally off, and at this time, an inductive current flows in from the a port (i.e., the first port) to charge the fourth capacitor (or the positive bus capacitor) C4. Specifically, when the third transistor VT13 is in an on state, a current flows from the a port through the first inductor L1, the third transistor VT13, the second diode VD12, and energy is stored in the first inductor L1; when the third transistor VT13 is in the off state, the energy of the first inductor L1 charges the fourth capacitor C4 by boosting through the first transistor VT11 and the diode (e.g., body diode) of the second transistor VT 12. Similarly, when the a-phase sine wave ac input is negative half cycle, the second transistor VT12 and the fourth transistor VT14 switch to operate, the third transistor VT13 is normally on, the first transistor VT11 is normally off, and at this time, the inductive current flows out from the a port to charge the fifth capacitor (or negative bus capacitor) C5. Specifically, when the second triode VT12 is in an on state, current flows out from the port a through the first diode VD11, the second triode VT12 and the first inductor L1 to store energy for the first inductor L1; when the third transistor VT13 is in the off state, the energy of the first inductor L1 charges the fifth capacitor C5 with a boost voltage through the third transistor VT13 and the diode (e.g., body diode) of the fourth transistor VT 14. The working principle of other phases is the same as the working mode, and the description is omitted here.
The conversion function of the ac-dc conversion device 10 can convert the three-phase ac power into the dc power having a ripple frequency 6 times the input frequency, that is, the ripple frequency of the first dc voltage is 6 times the ripple frequency of the three-phase ac voltage. While a single-phase ac input power supply device (i.e., a stand-alone device described below) outputs a dc ripple having a frequency that is only 2 times the input frequency by a similar transformation. Therefore, when the bus capacitance is reduced to a considerable capacity, the dc bus ripple of the three-phase ac input device (i.e., the ac/dc converter 10) is much smaller than that of a single device. The size of the ripple (namely the ripple of the second direct current voltage) of the low-voltage direct current output end of the power supply is influenced by the direct current of the size of the direct current bus ripple, and the ripple of the low-voltage direct current output end of the power supply is smaller because the direct current bus ripple of the three-phase alternating current input equipment is smaller, so that the ripple of the low-voltage direct current output end of the power supply is smaller, and the performance of the whole bidirectional power supply is more excellent.
In an alternative embodiment, when the number of resonant networks is two, the two interconnected resonant networks comprise a first resonant network 21 and a second resonant network 22; as shown in fig. 4, the first resonant network 21 includes: a thirteenth triode VT41, a fourteenth triode VT42, a fifteenth triode VT43, a sixteenth triode VT44, a fourth inductor L4, a fourth capacitor C4, a sixth capacitor C6 and a first transformer T1; the second resonant network 22 comprises: the circuit comprises a seventeenth triode VT51, an eighteenth triode VT52, a nineteenth triode VT53, a twentieth triode VT54, a fifth inductor L5, a fifth capacitor C5, a seventh capacitor C7 and a second transformer T2.
In terms of the connection structure, as shown in fig. 4, one end of the fourth capacitor C4 is connected to one end of the ninth transistor VT31, and the other end of the fourth capacitor C4 is connected to one end of the fifth capacitor C5; one end of a fourth capacitor C4 is further connected to one end of a thirteenth transistor VT41, the other end of the thirteenth transistor VT41 is connected to one end of a fourteenth transistor VT42, the other end of the fourteenth transistor VT42 is connected to the other end of the fourth capacitor C4, one end of a fifteenth transistor VT43 is connected to one end of the thirteenth transistor VT41, the other end of the fifteenth transistor VT43 is connected to one end of a sixteenth transistor VT44, the other end of the sixteenth transistor VT44 is connected to the other end of the fourth capacitor C4, one end of a fourth inductor L4 is connected to a node between the thirteenth transistor VT41 and the fourteenth transistor VT42, the other end of the fourth inductor L4 is connected to one end of a sixth capacitor C6, the other end of the sixth capacitor C6 is connected to one end of a first transformer T1, and the other end of a first transformer T1 is connected to a node between the fifteenth transistor VT43 and the sixteenth transistor VT 44;
the other end of the fifth capacitor C5 is connected to the other end of the twelfth transistor VT34, one end of the fifth capacitor C5 is further connected to one end of the seventeenth transistor VT51, the other end of the seventeenth transistor VT51 is connected to one end of the eighteenth transistor VT52, the other end of the eighteenth transistor VT52 is connected to the other end of the fifth capacitor C5, one end of the nineteenth transistor VT53 is connected to one end of the seventeenth transistor VT51, the other end of the nineteenth transistor VT53 is connected to one end of the twentieth transistor VT54, the other end of the twentieth transistor VT54 is connected to the other end of the fifth capacitor C5, one end of the fifth inductor L5 is connected to a node between the seventeenth transistor VT51 and the eighteenth transistor VT52, the other end of the fifth inductor L5 is connected to one end of the seventh capacitor C7, the other end of the seventh capacitor C7 is connected to one end of the second transformer T2, and the other end of the second transformer T56 is connected to a node 86 53 and the nineteenth transistor VT 54.
The resonant converter circuit 20 mainly functions to convert the high-voltage DC voltage output from the AC/DC device into a high-frequency AC low-voltage (i.e., the target AC voltage) by means of the LLC resonant network conversion topology. The part divides the high-voltage direct current voltage into a positive bus voltage part and a negative bus voltage part through two resonance networks with the same parameters. At this time, the resonant transformation circuit 20 forms two resonant cavities, namely a first resonant network 21 and a second resonant network 22. Although the hardware parameters of the two resonant networks are the same, the low ripple voltage (i.e. the target alternating voltage) output is realized by adopting a staggered wave-sending mode on the wave-sending control. In fig. 4, the parameters of the fourth inductor L4 and the fifth inductor L5 are the same, the parameters of the sixth capacitor C6 and the seventh capacitor C7 are the same, and the parameters of the transformer T1 and the transformer T2 are the same.
As shown in fig. 4, a first resonant network 21 is formed by a fourth capacitor C4, a thirteenth triode VT 41-a sixteenth triode VT44, a fourth inductor L4, a sixth capacitor C6 and a transformer T1, a second resonant network 22 is formed by a fifth capacitor C5, a seventeenth triode VT 51-a twentieth triode VT54, a fifth inductor L5, a seventh capacitor C7 and a transformer T2, hardware parameters of the two resonant networks are consistent, and a staggered wave-sending mode is adopted during wave sending, so that low ripple voltage output at a direct-current end can be realized.
In an alternative embodiment, when the number of the resonant networks is two, the above-mentioned manner of staggered wave-sending may be: the phase of the wave of the first resonant network 21 differs from the phase of the wave of the second resonant network 22 by 90 degrees. It should be noted that the number of the resonant networks may be two or more, and therefore, the staggered wave-sending mode based on the resonant networks is not specifically limited in the embodiment of the present invention.
Fig. 5 is a schematic diagram of the staggered wave-emitting timing of the thirteenth transistor VT41 and the seventeenth transistor VT 51. Because the LLC control strategy is adopted in the application, the wave-emitting frequencies of the two resonant networks are the same, and the wave-emitting phases of the two resonant networks corresponding to the switch tube have a 90-degree difference.
In an alternative embodiment, as shown in fig. 4, the synchronous rectification circuit 30 includes: a twenty-first triode VT45, a twenty-second triode VT46, a twenty-third triode VT55, a twenty-fourth triode VT56 and an eighth capacitor C8; one end of a twenty-first triode VT45 is connected with the first transformer T1, one end of a twenty-second triode VT46 is connected with the first transformer T1, and the other end of the twenty-first triode VT45 is connected with the other end of the twenty-second triode VT 46; one end of a twenty-third triode VT55 is connected with the second transformer T2, one end of a twenty-fourth triode VT56 is connected with the second transformer T2, and the other end of the twenty-third triode VT55 is connected with the other end of the twenty-fourth triode VT 56; the twenty-second triode VT46 is also connected with the other end of the twenty-fourth triode VT 56; one end of the eighth capacitor C8 is connected to a node between the first transformer T1 and the second transformer T2; the other end of the eighth capacitor C8 is connected to a node between the twenty-second transistor VT46 and the twenty-fourth transistor VT 56.
The main function of the synchronous rectification circuit 30 is to rectify the low-voltage high-frequency voltage output by the resonant conversion circuit 20 into a second dc voltage for output, and the low ripple at the dc output end can be realized by combining with a staggered wave-sending control method, so that the performance of the whole power supply device can be improved. The synchronous rectification circuit 30 described above may include: a first synchronous rectifier sub-circuit and a second synchronous rectifier sub-circuit, wherein the first synchronous rectifier sub-circuit and the second synchronous rectifier sub-circuit correspond to the first resonant network 21 and the second resonant network 22, respectively. The wave-sending time sequences of the two synchronous rectifier sub-circuits correspond to the wave-sending time sequences of the corresponding resonant networks, and because the synchronous rectifier circuit 30 also adopts an interleaving wave-sending mode, the high-frequency ripple frequency at the low-voltage direct-current output end is 4 times of the wave-sending frequency of the LLC resonant network. This embodiment can make the ripple of the low-voltage dc output terminal smaller, which can greatly reduce the capacity of the output capacitor (i.e., the above-mentioned eighth capacitor) C8 in fig. 4.
It should be noted that the bidirectional power supply device in the embodiment of the present invention may be replaced with a unidirectional power supply device. The application does not do specific limitation to the model and the specification of all the components and parts such as the diode, the triode, the inductor, the capacitor, the transformer and the like related to the bidirectional power supply equipment.
In summary, the scheme that the three-phase PFC forms the low bus voltage ripple, the connection mode of the two resonant cavities in the resonant conversion circuit 20, and the control mode that the high frequency ripple at the low-voltage dc output end is reduced by interleaving the wave sending are the inventions of the embodiment of the present invention. Specifically, (1) compared with a single-phase PFC, the three-phase high-power PFC has higher power and lower bus ripple, can realize low power frequency ripple of the output end of the AC/DC device, and reduces software difficulty. (2) The staggered LLC design in the embodiment of the invention can divide the bus voltage into the positive bus voltage and the negative bus voltage to form two resonant cavities, greatly reduces the capacity of an output capacitor in a staggered wave-sending mode, and can obtain smaller high-frequency ripples.
Compared with the prior art, the embodiment of the invention can enable the synchronous rectification circuit 30 to output lower ripple voltage at lower cost, thereby enabling the system performance to be better. Specifically, the power frequency ripple of the direct current bus can be reduced through the above AC/DC device, and the high frequency ripple of the low-voltage direct current output end is reduced by the staggered wave-sending mode of the resonant conversion circuit 20 and the synchronous rectification circuit 30, so that the low power frequency ripple and the low high frequency ripple of the direct current output end can be realized by adopting the above technical scheme.
Example 2:
according to an embodiment of the present invention, there is provided a flowchart of a power supply control method applied to the bidirectional power supply device in embodiment 1. It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions and that, although a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than presented herein.
Fig. 6 is a flowchart of a power control method according to an embodiment of the present invention, and as shown in fig. 6, the method includes the following steps:
step S101, receiving a three-phase ac voltage provided by an external device, and converting the three-phase ac voltage into a first dc voltage. Wherein the ripple of the first direct-current voltage is lower than the ripple of the three-phase alternating-current voltage.
And step S102, inverting the first direct-current voltage into a target alternating-current voltage by adopting a staggered wave-sending mode. Wherein the ripple of the target alternating-current voltage is lower than the ripple of the first direct-current voltage.
Step S103, rectifies the target ac voltage into a second dc voltage. Wherein the ripple of the second DC voltage is lower than the ripple of the target AC voltage.
According to the embodiment of the invention, the ripple waves of the target alternating-current voltage are reduced through three-phase alternating-current input and a staggered wave-sending mode, and the low power frequency ripple waves and the low high frequency ripple waves of the target alternating-current voltage can be realized by adopting the technical scheme.
It is clear to those skilled in the art that, for convenience and brevity of description, the working processes of the elements in the foregoing embodiment 1 of the apparatus may be referred to in the above described embodiment of the method, and are not described herein again.
Example 3:
the embodiment of the present invention provides a power control device, which is mainly used for executing the power control method provided in the above-mentioned embodiment 2, and the following describes the power control device provided in the embodiment of the present invention in detail.
Fig. 7 is a schematic structural diagram of a power control apparatus according to an embodiment of the present invention. As shown in fig. 7, the power supply control device mainly includes: a receiving conversion module 71, an inversion module 72 and a rectification module 73, wherein:
a receiving and converting module 71, configured to receive a three-phase alternating-current voltage provided by an external device, and convert the three-phase alternating-current voltage into a first direct-current voltage; wherein, the ripple of the first direct current voltage is lower than the ripple of the three-phase alternating current voltage;
an inverting module 72 for inverting the first direct-current voltage into a target alternating-current voltage by adopting a staggered wave-sending manner; wherein the ripple of the target alternating-current voltage is lower than the ripple of the first direct-current voltage;
a rectifying module 73 for rectifying the target ac voltage into a second dc voltage; wherein the ripple of the second DC voltage is lower than the ripple of the target AC voltage.
The embodiment of the invention combines the three-phase alternating current input of the receiving and converting module and the staggered wave-sending mode of the inverting module and the rectifying module, reduces the ripple waves of the target alternating current voltage, and can realize the low power frequency ripple waves and the low high frequency ripple waves of the target alternating current voltage by adopting the technical scheme.
In an optional embodiment, the present embodiment further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program operable on the processor, and the processor executes the computer program to implement the steps of the method of the foregoing method embodiment.
In an alternative embodiment, the present embodiment also provides a computer readable medium having non-volatile program code executable by a processor, wherein the program code causes the processor to perform the method of the above method embodiment.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present embodiment, it should be understood that the disclosed method and apparatus may be implemented in other manners. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present embodiment or parts of the technical solution may be essentially implemented in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.

Claims (9)

1. A bi-directional power supply apparatus, comprising: the AC/DC conversion device, the resonance conversion circuit and the synchronous rectification circuit are connected in sequence; the resonant transformation circuit comprises at least two resonant networks which are connected with each other; the power flows of the alternating current-direct current conversion device, the resonance conversion circuit and the synchronous rectification circuit all flow in two directions;
the alternating current-direct current conversion device is used for receiving three-phase alternating current voltage provided by external equipment and converting the three-phase alternating current voltage into first direct current voltage; wherein a ripple of the first direct-current voltage is lower than a ripple of the three-phase alternating-current voltage; the ripple frequency of the first direct-current voltage is 6 times of the ripple frequency of the three-phase alternating-current voltage;
the resonance conversion circuit is used for inverting the first direct-current voltage into a target alternating-current voltage in a mode of carrying out staggered wave sending on the at least two mutually connected resonance networks; wherein a ripple of the target alternating-current voltage is lower than a ripple of the first direct-current voltage;
the synchronous rectification circuit is used for rectifying the target alternating-current voltage into a second direct-current voltage; wherein a ripple of the second direct current voltage is lower than a ripple of the target alternating current voltage; the ripple frequency of the second direct-current voltage is 4 times of the ripple frequency of the target alternating-current voltage;
the alternating current-direct current conversion device comprises a target power conversion topological circuit, and the target power conversion topological circuit comprises: a two-level topology circuit, a three-level topology circuit, or a custom topology circuit.
2. The bi-directional power supply device of claim 1, wherein the three-level topology circuit comprises: the circuit comprises an input circuit, a first element device group, a second element device group, a third element device group and a capacitor group; the input circuit is connected with the first element device group, the second element device group, the third element device group and the resonance transformation circuit;
the first component group comprises a first triode, a second triode, a third triode and a fourth triode which are connected in sequence, and further comprises a first diode and a second diode, one end of the first diode is connected with a node between the first triode and the second triode, the other end of the first diode is connected with one end of the second diode, and the other end of the second diode is connected with a node between the third triode and the fourth triode;
the second component group comprises a fifth triode, a sixth triode, a seventh triode and an eighth triode which are sequentially connected, and further comprises a third diode and a fourth diode, wherein one end of the third diode is connected with a node between the fifth triode and the sixth triode, the other end of the third diode is connected with one end of the fourth diode, and the other end of the fourth diode is connected with a node between the seventh triode and the eighth triode;
the third component group comprises a ninth triode, a thirteenth triode, an eleventh triode and a twelfth triode which are sequentially connected, and further comprises a fifth diode and a sixth diode, one end of the fifth diode is connected with a node between the ninth triode and the thirteenth triode, the other end of the fifth diode is connected with one end of the sixth diode, and the other end of the sixth diode is connected with a node between the eleventh triode and the twelfth triode;
the input circuit comprises a first sub-input circuit, a second sub-input circuit and a third sub-input circuit;
the first sub-input circuit comprises a first port, a first inductor and a first capacitor, one end of the first port is connected with a first alternating-current voltage in the three-phase alternating-current voltages, the other end of the first port is connected with one end of the first inductor, the other end of the first inductor is connected with a node between the second triode and the third triode, the other end of the first port is further connected with one end of the first capacitor, and the other end of the first capacitor is connected with the resonance conversion circuit;
the second sub-input circuit comprises a second port, a second inductor and a second capacitor, one end of the second port is connected with a second-phase alternating-current voltage in the three-phase alternating-current voltages, the other end of the second port is connected with one end of the second inductor, the other end of the second inductor is connected with a node between the sixth triode and the seventh triode, the other end of the second port is also connected with one end of the second capacitor, and the other end of the second capacitor is connected with the resonance conversion circuit;
the third sub-input circuit comprises a third port, a third inductor and a third capacitor, one end of the third port is connected with a third alternating-current voltage in the three-phase alternating-current voltages, the other end of the third port is connected with one end of the third inductor, the other end of the third inductor is connected with a node between the thirteenth triode and the eleventh triode, the other end of the third port is further connected with one end of the third capacitor, and the other end of the third capacitor is connected with the resonance conversion circuit.
3. The bidirectional power supply apparatus according to claim 2, wherein when the number of the resonant networks is two, the two interconnected resonant networks include a first resonant network and a second resonant network;
the first resonant network comprises: a thirteenth triode, a fourteenth triode, a fifteenth triode, a sixteenth triode, a fourth inductor, a fourth capacitor, a sixth capacitor and a first transformer;
the second resonant network comprises: the seventeenth triode, the eighteenth triode, the nineteenth triode, the twentieth triode, the fifth inductor, the fifth capacitor, the seventh capacitor and the second transformer;
one end of the fourth capacitor is connected with one end of the ninth triode, and the other end of the fourth capacitor is connected with one end of the fifth capacitor; one end of the fourth capacitor is further connected with one end of the thirteenth triode, the other end of the thirteenth triode is connected with one end of the fourteenth triode, the other end of the fourteenth triode is connected with the other end of the fourth capacitor, one end of the fifteenth triode is connected with one end of the thirteenth triode, the other end of the fifteenth triode is connected with one end of the sixteenth triode, the other end of the sixteenth triode is connected with the other end of the fourth capacitor, one end of the fourth inductor is connected with a node between the thirteenth triode and the fourteenth triode, the other end of the fourth inductor is connected with one end of the sixth capacitor, the other end of the sixth capacitor is connected with one end of the first transformer, the other end of the first transformer is connected with a node between the fifteenth triode and the sixteenth triode;
the other end of the fifth capacitor is connected with the other end of the twelfth triode, one end of the fifth capacitor is further connected with one end of the seventeenth triode, the other end of the seventeenth triode is connected with one end of the eighteenth triode, the other end of the eighteenth triode is connected with the other end of the fifth capacitor, one end of the nineteenth triode is connected with one end of the seventeenth triode, the other end of the nineteenth triode is connected with one end of the twentieth triode, the other end of the twentieth triode is connected with the other end of the fifth capacitor, one end of the fifth inductor is connected with a node between the seventeenth triode and the eighteenth triode, the other end of the fifth inductor is connected with one end of the seventh capacitor, and the other end of the seventh capacitor is connected with one end of a second transformer, the other end of the second transformer is connected with a node between the nineteenth triode and the twentieth triode.
4. The bidirectional power supply apparatus according to claim 3, wherein said synchronous rectification circuit comprises: a twenty-first triode, a twenty-second triode, a twenty-third triode, a twenty-fourth triode and an eighth capacitor;
one end of the twenty-first triode is connected with the first transformer, one end of the twenty-second triode is connected with the first transformer, and the other end of the twenty-first triode is connected with the other end of the twenty-second triode;
one end of the twenty-third triode is connected with the second transformer, one end of the twenty-fourth triode is connected with the second transformer, and the other end of the twenty-third triode is connected with the other end of the twenty-fourth triode;
the twenty-second triode is also connected with the other end of the twenty-fourth triode;
one end of the eighth capacitor is connected with a node between the first transformer and the second transformer; the other end of the eighth capacitor is connected with a node between the twenty-second triode and the twenty-fourth triode.
5. The bi-directional power supply device of claim 3, wherein said staggered pulsing is by: the wave-sending phase of the first resonant network is different from the wave-sending phase of the second resonant network by 90 degrees.
6. A power supply control method applied to the bidirectional power supply device according to any one of claims 1 to 5, comprising:
receiving three-phase alternating-current voltage provided by external equipment, and converting the three-phase alternating-current voltage into first direct-current voltage; wherein a ripple of the first direct-current voltage is lower than a ripple of the three-phase alternating-current voltage; the ripple frequency of the first direct-current voltage is 6 times of the ripple frequency of the three-phase alternating-current voltage;
inverting the first direct-current voltage into a target alternating-current voltage by adopting a staggered wave-sending mode; wherein a ripple of the target alternating-current voltage is lower than a ripple of the first direct-current voltage;
rectifying the target alternating-current voltage into a second direct-current voltage; wherein a ripple of the second direct current voltage is lower than a ripple of the target alternating current voltage; the ripple frequency of the second direct-current voltage is 4 times of the ripple frequency of the target alternating-current voltage.
7. A power supply control device applied to the bidirectional power supply apparatus according to any one of claims 1 to 5, comprising:
the receiving and converting module is used for receiving three-phase alternating-current voltage provided by external equipment and converting the three-phase alternating-current voltage into first direct-current voltage; wherein a ripple of the first direct-current voltage is lower than a ripple of the three-phase alternating-current voltage; the ripple frequency of the first direct-current voltage is 6 times of the ripple frequency of the three-phase alternating-current voltage;
the inversion module is used for inverting the first direct-current voltage into a target alternating-current voltage in a staggered wave-sending mode; wherein a ripple of the target alternating-current voltage is lower than a ripple of the first direct-current voltage;
the rectifying module is used for rectifying the target alternating-current voltage into a second direct-current voltage; wherein a ripple of the second direct current voltage is lower than a ripple of the target alternating current voltage; the ripple frequency of the second direct-current voltage is 4 times of the ripple frequency of the target alternating-current voltage.
8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method of claim 6 when executing the computer program.
9. A computer-readable medium having non-volatile program code executable by a processor, the program code causing the processor to perform the method of claim 6.
CN202110803680.0A 2021-07-16 2021-07-16 Bidirectional power supply equipment, power supply control method and device Active CN113258800B (en)

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