CN113949275B - Multi-source DC-DC conversion circuit - Google Patents

Multi-source DC-DC conversion circuit Download PDF

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CN113949275B
CN113949275B CN202111128398.3A CN202111128398A CN113949275B CN 113949275 B CN113949275 B CN 113949275B CN 202111128398 A CN202111128398 A CN 202111128398A CN 113949275 B CN113949275 B CN 113949275B
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diode
transformer
anode
cathode
source
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CN113949275A (en
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杨益平
陈怡�
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Hangzhou Yunshi Iot Technology Co ltd
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Hangzhou Yunshi Iot 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
    • 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
    • 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
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H02M1/34—Snubber circuits

Abstract

A multi-source DC-DC conversion circuit comprises transformers T1 to Tn, switches S1 to Sn, diodes D1a to Dna, diodes D1b to Dnb, diodes D1c to Dnc, inductors L1 to Ln and capacitors Co, wherein the range of the values of the capacitors Co and n is an integer larger than 1. The inductors L1 to Ln which are similar to polygonal connection modes are adopted to cooperate with the transformers T1 to Tn, so that energy coupling between multiple inputs can be realized, and the utilization rate of the transformers is improved; the switch can be switched on and off by changing the working state of the switch, and can support the connection and disconnection of a direct-current voltage source.

Description

Multi-source DC-DC conversion circuit
Technical Field
The present invention relates to a DC-DC conversion circuit, and more particularly, to a multi-source DC-DC conversion circuit.
Background
The new energy technology comprises comprehensive utilization of various energy sources, and a multi-input DC-DC (direct current to direct current, direct current-direct current) conversion circuit is an important component of the multi-energy comprehensive utilization device. For the case of multiple inputs, the most common practice is at present: a plurality of independent single-input single-output DC-DC conversion circuits are adopted to form a single-phase multiple circuit, namely, the input ends are kept independent, and the output ends are connected in parallel.
The single-phase multiple circuit has simple structure, and because each sub-circuit works independently, the whole sub-circuit and the whole sub-circuit only show a simple superposition relation. To improve the performance of existing conventional multi-input DC-DC conversion circuits, the possibility of further exploiting the more efficient relationship between the whole and the sub-circuits is needed.
Disclosure of Invention
In order to overcome the defect that the whole and sub-circuits of the existing single-phase multiple circuit only show a simple superposition relationship, the invention provides a multi-source DC-DC conversion circuit, which shows a complex relationship between the whole and sub-circuits and is beneficial to fully utilizing energy sources of all paths.
According to the embodiment of the invention, the multi-source DC-DC conversion circuit comprises transformers T1 to Tn, switches S1 to Sn, diodes D1a to Dna, diodes D1b to Dnb, diodes D1c to Dnc, inductors L1 to Ln and capacitors Co, wherein the range of the values of the diodes D1a to Dna, the diodes D1c to Dnc, the inductors L1 to Ln is an integer larger than 1.
The positive end of the direct current voltage source Vij is connected with the first end of the primary side of the transformer Tj, the second end of the primary side of the transformer Tj is connected with the first end of the switch Sj, the second end of the switch Sj is connected with the negative end of the direct current voltage source Vij, the first end of the secondary side of the transformer Tj is connected with the anode of the diode Dja, the cathode of the diode Dja is simultaneously connected with the first end of the capacitor Co and the first end of the load, the second end of the secondary side of the transformer Tj is connected with the cathode of the diode Djb, the anode of the diode Djb is simultaneously connected with the second end of the capacitor Co and the second end of the load, the first end of the primary side of the transformer Tj and the second end of the secondary side of the transformer Tj are in homonymous end relation, and the value range of j is 1 to n. The first end of the inductor L1 is connected with the second end of the inductor Ln, the second end of the inductor Lk is connected with the first end of the inductor Lk+1, and the value range of k is 1 to n-1.
The inductors L1 to Ln which are connected end to end and adopt a similar polygonal connection mode cooperate with the transformers T1 to Tn, so that energy coupling between multiple inputs can be realized.
Preferably, the anode of diode Djc is connected to the anode of diode Djb, the cathode of diode Djc is connected to the anode of diode Dja, and the first terminal of inductor Lj is connected to the second terminal of the secondary side of transformer Tj.
Alternatively, the anode of diode Djc is connected to the cathode of diode Djb, the cathode of diode Djc is connected to the cathode of diode Dja, and the first terminal of inductor Lj is connected to the first terminal of the secondary side of transformer Tj.
In order to overcome the influence of leakage inductance of the transformer Tj, a buffer branch j can be connected in parallel with the primary side of the transformer Tj, so that the terminal voltage of the switch Sj is restrained, and the effect of protecting the switch Sj is achieved. The buffer branch j may include a diode, a TVS (transient diode), a resistor, a capacitor, and the like.
The direct-current voltage sources Vi1 to Vin can be direct-current power generation systems (such as photovoltaic power generation) or direct-current energy storage systems (such as battery energy storage), and can also be alternating-current power generation systems (such as wind power generation, photo-thermal power generation, tidal power generation and the like) or alternating-current energy storage systems (such as flywheel energy storage) cascading rectifier circuits.
The driving signals vg1 to vgn of the switches S1 to Sn may be synchronous or asynchronous (e.g., staggered asynchronous). When the voltages of the direct voltage sources are not exactly the same or the switch drive signals are not exactly synchronized, there is an energy coupling between the inputs.
The parameters of the transformers T1 to Tn allow differences such as: the primary and secondary side excitation inductances are not identical.
The switches S1 to Sn may be MOSFET, IGBT, BJT or the like.
One or more of the diodes D1a to Dna, D1b to Dnb, and D1c to Dnc may be replaced by synchronous rectification MOSFETs.
The embodiment of the invention also provides a multi-source DC-DC conversion circuit which comprises a plurality of conversion units respectively connected to a plurality of direct current voltage sources, a plurality of inductors and a capacitor connected in parallel with a load, wherein each inductor and each capacitor are provided with a first end and a second end. Each transformation unit comprises: the transformer is provided with a primary side and a secondary side, wherein the first end of the primary side is connected with the first end of a corresponding direct current voltage source; the switch is provided with a first end and a second end, wherein the first end of the switch is connected with the second end of the primary side of the transformer, and the second end of the switch is connected with the second end of the corresponding direct-current voltage source; the first diode is provided with an anode and a cathode, wherein the anode of the first diode is connected with the first end of the secondary side of the transformer, and the cathode of the first diode is connected with the first end of the capacitor; the second diode is provided with an anode and a cathode, wherein the anode of the second diode is connected with the second end of the capacitor, and the cathode of the second diode is connected with the second end of the secondary side of the transformer; and a third diode having an anode and a cathode, wherein the anode of the third diode is connected to the anode of the second diode and the cathode of the third diode is connected to the anode of the first diode. The inductors are connected end to end, and the first end of each inductor is connected with the second end of the secondary side of the transformer in the corresponding transformation unit.
Embodiments of the present invention still further provide a multi-source DC-DC conversion circuit including a plurality of conversion units respectively connected to a plurality of DC voltage sources, a plurality of inductors, and a capacitor connected in parallel with a load, wherein each of the inductors and the capacitor has a first end and a second end. Each transformation unit comprises: the transformer is provided with a primary side and a secondary side, wherein the first end of the primary side is connected with the first end of a corresponding direct current voltage source; the switch is provided with a first end and a second end, wherein the first end of the switch is connected with the second end of the primary side of the transformer, and the second end of the switch is connected with the second end of the corresponding direct-current voltage source; the first diode is provided with an anode and a cathode, wherein the anode of the first diode is connected with the first end of the secondary side of the transformer, and the cathode of the first diode is connected with the first end of the capacitor; the second diode is provided with an anode and a cathode, wherein the anode of the second diode is connected with the second end of the capacitor, and the cathode of the second diode is connected with the second end of the secondary side of the transformer; and a third diode having an anode and a cathode, wherein the anode of the third diode is connected to the cathode of the second diode and the cathode of the third diode is connected to the cathode of the first diode. The inductors are connected end to end, and the first end of each inductor is connected with the first end of the secondary side of the transformer in the corresponding transformation unit.
The beneficial effects of the invention are mainly shown in the following steps: in the multi-source DC-DC conversion circuit provided by the embodiment of the invention, the energy coupling between multiple inputs can be realized by adopting the inductors similar to the polygonal connection mode and cooperating with the transformers T1 to Tn, so that the utilization rate of the transformers is improved.
Drawings
Fig. 1 is a circuit diagram of embodiment 1 of the present invention.
Fig. 2 is a circuit diagram of embodiment 2 of the present invention.
Fig. 3 is a waveform diagram of steady-state simulation of embodiment 1 of the present invention in a synchronous state of switch driving signals when the dc voltage source is fully connected.
Fig. 4 is a waveform diagram of steady-state simulation of embodiment 1 of the present invention in an asynchronous state of a switch driving signal when a dc voltage source is fully connected.
Fig. 5 is a dynamic simulation waveform diagram of embodiment 1 of the present invention when a dc voltage source is switched in/out in an asynchronous state of a switch driving signal.
Fig. 6 is a waveform diagram of steady-state simulation of embodiment 2 of the present invention in an asynchronous state of a switch driving signal when a dc voltage source is fully connected.
Fig. 7 is a dynamic simulation waveform diagram of embodiment 1 of the present invention when a dc voltage source is switched in/out in an asynchronous state of a switch driving signal.
Detailed Description
The invention is further described below with reference to the accompanying drawings. It should be noted that the embodiments described herein are for illustration only and are not intended to limit the invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be understood by those of ordinary skill in the art that these specific details are not required in order to practice the present invention. In other instances, well-known circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.
Throughout the specification, references to "one embodiment," "an embodiment," "one example," or "an example" mean: a particular feature, structure, or characteristic described in connection with the embodiment or example is included within at least one embodiment of the invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "one example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that like reference numerals designate like elements. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present.
The invention provides a multi-source DC-DC conversion circuit which supports multi-path input and can realize partial coupling of energy of each path. Compared with a single-phase multiple circuit in the prior art, the invention utilizes the characteristic of electrical isolation of the transformer, realizes partial coupling of energy of each path on the secondary side of the transformer, and is beneficial to expanding the variety of the multi-input DC-DC conversion circuit and improving the performance of the multi-input DC-DC conversion circuit.
Example 1
Referring to fig. 1, a multi-source DC-DC conversion circuit includes transformers T1 to Tn, switches S1 to Sn, diodes D1a to Dna, diodes D1b to Dnb, diodes D1c to Dnc, inductors L1 to Ln, and capacitors Co, where n are integers greater than 1.
The positive end of the direct current voltage source Vij is connected with the first end of the primary side of the transformer Tj, the second end of the primary side of the transformer Tj is connected with the first end of the switch Sj, the second end of the switch Sj is connected with the negative end of the direct current voltage source Vij, the first end of the secondary side of the transformer Tj is connected with the anode of the diode Dja, the cathode of the diode Dja is simultaneously connected with the first end of the capacitor Co and the first end of the load, the second end of the secondary side of the transformer Tj is connected with the cathode of the diode Djb, the anode of the diode Djb is simultaneously connected with the second end of the capacitor Co and the second end of the load, the first end of the primary side of the transformer Tj and the second end of the secondary side of the transformer Tj are in homonymous end relation, and the value range of j is 1 to n. The first end of the inductor L1 is connected with the second end of the inductor Ln, the second end of the inductor Lk is connected with the first end of the inductor Lk+1, and the value range of k is 1 to n-1. An anode of the diode Djc is connected to an anode of the diode Djb, a cathode of the diode Djc is connected to an anode of the diode Dja, and a first terminal of the inductor Lj is connected to a second terminal of the secondary side of the transformer Tj.
When the switch Sj is normally open (or normally closed), the direct-current voltage source Vij is connected out; when the switch Sj is periodically turned on/off (or periodically turned on/off), the dc voltage source Vij is turned on.
In order to overcome the influence of leakage inductance of the transformer Tj, a buffer branch j is connected in parallel with the primary side of the transformer Tj, so that the terminal voltage of the switch Sj is restrained, and the effect of protecting the switch Sj is achieved. The buffer branch j may include a diode, a TVS (transient diode), a resistor, a capacitor, and the like.
The direct-current voltage sources Vi1 to Vin can be direct-current power generation systems (such as photovoltaic power generation) or direct-current energy storage systems (such as battery energy storage), and can also be alternating-current power generation systems (such as wind power generation, photo-thermal power generation, tidal power generation and the like) or alternating-current energy storage systems (such as flywheel energy storage) cascading rectifier circuits.
The driving signals vg1 to vgn of the switches S1 to Sn may be synchronous or asynchronous (e.g., staggered asynchronous).
The parameters of the transformers T1 to Tn allow differences such as: the primary and secondary side excitation inductances are not identical.
The switches S1 to Sn may be MOSFETs, or may be other suitable controllable switching devices, such as IGBTs, BJTs, etc.
The transformer Tj, the switch Sj, and the diode Dja, djb, djc can be regarded as one transforming unit, and the multi-source DC-DC transforming circuit according to an embodiment of the present invention includes n transforming units, n inductors, and a capacitor Co. The number of the input ports can be expanded only by increasing the number of the conversion units and the inductors. The inductors L1 to Ln are connected end to end, and energy coupling between multiple inputs can be realized by adopting a polygonal connection mode and cooperating with the transformers T1 to Tn in the transformation unit.
For ease of understanding and simplicity, assuming that v1= … =vin, t1= … =tn, l1= … =ln, and each component is ideal, a typical operating state and a circuit portion related to v1, S1, T1, D1a, D1b, D1c, and L1 are selected for steady-state operation principle analysis of Continuous Conduction Mode (CCM).
(1) Direct current voltage source full access
When vg1 to vgn are synchronized, the terminal voltage of the inductor Lj is 0, the current iLj of the inductor Lj is 0, and no energy coupling exists between the inputs; when vg1 to vgn are asynchronous, the terminal voltage of the inductor Lj is not constant equal to 0, ilj is not constant equal to 0, and energy coupling exists between the inputs.
Taking vg1 to vgn as an example, analysis was performed. If the Lj terminal voltage is positive, iLj is increased positively; if the Lj terminal voltage is 0, lj maintains the existing energy level, iLj remains unchanged; if the Lj terminal voltage is negative, iLj increases inversely. Lj stores energy when | iLj | increases; when | iLj | decreases, lj releases energy. When idja is greater than 0, dja is turned on; otherwise, dja is cut off. When idjb >0, djb turns on; otherwise, djb is cut off. When idjc >0, djc turns on; otherwise, djc is cut off. With S1 as the view angle, the working state can be divided into 2 stages.
Stage 1: s1 is conducted, vi1 is output, vi1, T1 primary side and S1 form a loop, and excitation inductance of T1 primary side stores energy. On the load side, D1b is off. If iL1-iLn <0, D1a is on; if iL1-iLn >0, D1c is turned on. The loop that can be formed on the load side depends on iL1 to iLn and on/off states of the respective diodes. For example: when D2b is turned on, if iL1-iLn is less than 0 and iL1 is less than 0, L1, T1 secondary side, D1a, co, load and D2b form a loop, iL1 is reduced and L1 releases energy to T1, co and load.
Stage 2: s1 is cut off, and Vi1 stops outputting. On the load side, D1a is on and D1c is off. The loop that can be formed on the load side is still dependent on iL1 to iLn and on/off state of each diode. For example: when D1b is conducted, the secondary side of T1, D1a, co, the load and D1b form a loop, and the exciting inductance of the secondary side of T1 releases energy to Co and the load.
In the 2 working stages, the secondary side of the T1 participates in the work, and the utilization rate of the T1 is high.
(2) DC voltage source part is tapped
Let vgj always be 0 and Sj always be off, assuming Vij is out. Except for Lj, the circuit portion associated with Vij will no longer be involved in operation. However, the working state when part of the signals are out is still similar to the working state when all the signals are in the in-process state, and the description is omitted.
Taking n=3, v1=v2=v3=48v, load=50Ω; the parameters of T1 to T3 are the same, primary side excitation inductance Lmpj=500 mu H, tj of Tj and secondary side excitation inductance Lmsj=2mh of Tj, the coupling coefficient of Tj is 0.99, and the value range of j is 1 to 3; l1=l2=l3=300 μh; the frequencies of the switch drive signals vg1 to vg3 are each 100kHz and the duty cycles are each 0.5.
Taking the synchronous state of the switch driving signal as vg1=vg2=vg3; the phases of the switch driving signals with asynchronous states of vg1, vg2 and vg3 are sequentially delayed by 2 pi/3. Fig. 3 is a waveform diagram of steady-state simulation of embodiment 1 of the present invention in a synchronous state of switch driving signals when the dc voltage source is fully connected. Fig. 4 is a waveform diagram of steady-state simulation of embodiment 1 of the present invention in an asynchronous state of a switch driving signal when a dc voltage source is fully connected. Fig. 5 is a dynamic simulation waveform diagram of embodiment 1 of the present invention when the dc voltage source Vi3 is switched in/out in an asynchronous state of the switch driving signal.
From the simulation results shown in fig. 3 and fig. 4, it is known that the operating states of the switch driving signals in the full access case are different between synchronous and asynchronous states. When asynchronous, energy coupling exists between the inputs, and the secondary side of the transformer participates in the work in the whole working period, so that the utilization rate is high. From the simulation results shown in fig. 5, it can be seen that embodiment 1 of the present invention supports the switching in/out of the dc voltage source.
Example 2
Referring to fig. 2, a multi-source DC-DC conversion circuit includes transformers T1 to Tn, switches S1 to Sn, diodes D1a to Dna, diodes D1b to Dnb, diodes D1c to Dnc, inductors L1 to Ln, and capacitors Co, where n are integers greater than 1. An anode of the diode Djc is connected to a cathode of the diode Djb, a cathode of the diode Djc is connected to a cathode of the diode Dja, a first end of the inductor Lj is connected to a first end of a secondary side of the transformer Tj, and a value of j ranges from 1 to n. The rest of the structure is the same as in embodiment 1.
The working principle of embodiment 2 is similar to that of embodiment 1, and the waveforms are also similar. A typical asynchronous operating state is as follows:
stage 1: s1 is conducted, vi1 is output, vi1, T1 primary side and S1 form a loop, and excitation inductance of T1 primary side stores energy. On the load side, D1a is off. If iL1-iLn <0, D1c is on; if iL1-iLn >0, D1b is turned on. The loop that can be formed on the load side depends on iL1 to iLn and on/off states of the respective diodes. For example: when D2a is turned on, if iL1-iLn >0 and iL1>0, L1, D2a, co, load, D1b, T1 secondary side will form a loop, iL1 is reduced, L1 releases energy to T1, co and load.
Stage 2: s1 is cut off, and Vi1 stops outputting. On the load side, D1b is on and D1c is off. The loop that can be formed on the load side is still dependent on iL1 to iLn and on/off state of each diode. For example: when D1a is conducted, the secondary side of T1, D1a, co, the load and D1b form a loop, and the exciting inductance of the secondary side of T1 releases energy to Co and the load.
The same simulation setup as in example 1 was used. Fig. 6 is a waveform diagram of steady-state simulation of embodiment 2 of the present invention in an asynchronous state of a switch driving signal when a dc voltage source is fully connected. Fig. 7 is a dynamic simulation waveform diagram of embodiment 2 of the present invention when the dc voltage source Vi3 is switched in/out in an asynchronous state of the switch driving signal.
As can be seen from the simulation result shown in FIG. 6, when the switch driving signals are asynchronous under the full-access condition, energy coupling exists between the inputs, and the secondary side of the transformer participates in the work in the whole working period, so that the utilization rate is high. From the simulation results shown in fig. 7, it can be seen that embodiment 2 of the present invention supports switching in/out of the dc voltage source.
According to the multi-source DC-DC conversion circuit provided by the embodiment of the invention, the energy coupling between multiple inputs can be realized by adopting the inductors similar to the polygonal connection mode and cooperating with the transformers T1 to Tn, so that the utilization rate of the transformers is improved; the switch can be switched on and off by changing the working state of the switch, and can support the connection and disconnection of a direct-current voltage source.
While diodes are used in the foregoing embodiments for freewheeling and energy transfer on the secondary side of each transformer, those skilled in the art will appreciate that the diodes may be replaced by controllable switching devices (e.g., synchronous rectifier MOSFETs). In addition, as shown in fig. 1-2, the switch Sj is connected between the primary side of the transformer and the negative side of the DC voltage source Vij, and the first end of the primary side of the transformer Tj and the second end of the secondary side of the transformer Tj are in the same-name relationship, so long as the conversion unit in the multi-source DC-DC conversion circuit according to the embodiment of the present invention can adopt other suitable topologies, so long as the energy can be controlled to be transferred from the primary side of the transformer Tj to the secondary side of the transformer through the on and off of the switch Sj. The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, but the scope of protection of the present invention and equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims (10)

1. A multi-source DC-DC conversion circuit, characterized by: the multi-source DC-DC conversion circuit comprises transformers T1 to Tn, switches S1 to Sn, diodes D1a to Dna, diodes D1b to Dnb, diodes D1c to Dnc, inductors L1 to Ln and capacitors Co, wherein the range of the values of the capacitors Co and n is an integer larger than 1;
the first end of the primary side of the transformer Tj is connected with the positive end of the direct current voltage source Vij, the second end of the primary side of the transformer Tj is connected with the first end of the switch Sj, the second end of the switch Sj is connected with the negative end of the direct current voltage source Vij, the first end of the secondary side of the transformer Tj is connected with the anode of the diode Dja, the cathode of the diode Dja is simultaneously connected with the first end of the capacitor Co and the first end of the load, the second end of the secondary side of the transformer Tj is connected with the cathode of the diode Djb, the anode of the diode Djb is simultaneously connected with the second end of the capacitor Co and the second end of the load, the first end of the primary side of the transformer Tj and the second end of the secondary side of the transformer Tj are in the same-name end relationship, and the value range of j is 1 to n;
the first end of the inductor L1 is connected with the second end of the inductor Ln, the second end of the inductor Lk is connected with the first end of the inductor Lk+1, and the value range of k is 1 to n-1;
an anode of the diode Djc is connected to an anode of the diode Djb, a cathode of the diode Djc is connected to an anode of the diode Dja, and a first terminal of the inductor Lj is connected to a second terminal of the secondary side of the transformer Tj.
2. A multi-source DC-DC conversion circuit, characterized by: the multi-source DC-DC conversion circuit comprises transformers T1 to Tn, switches S1 to Sn, diodes D1a to Dna, diodes D1b to Dnb, diodes D1c to Dnc, inductors L1 to Ln and capacitors Co, wherein the range of the values of the capacitors Co and n is an integer larger than 1;
the first end of the primary side of the transformer Tj is connected with the positive end of the direct current voltage source Vij, the second end of the primary side of the transformer Tj is connected with the first end of the switch Sj, the second end of the switch Sj is connected with the negative end of the direct current voltage source Vij, the first end of the secondary side of the transformer Tj is connected with the anode of the diode Dja, the cathode of the diode Dja is simultaneously connected with the first end of the capacitor Co and the first end of the load, the second end of the secondary side of the transformer Tj is connected with the cathode of the diode Djb, the anode of the diode Djb is simultaneously connected with the second end of the capacitor Co and the second end of the load, the first end of the primary side of the transformer Tj and the second end of the secondary side of the transformer Tj are in the same-name end relationship, and the value range of j is 1 to n;
the first end of the inductor L1 is connected with the second end of the inductor Ln, the second end of the inductor Lk is connected with the first end of the inductor Lk+1, and the value range of k is 1 to n-1;
an anode of the diode Djc is connected to a cathode of the diode Djb, a cathode of the diode Djc is connected to a cathode of the diode Dja, and a first terminal of the inductor Lj is connected to a first terminal of the secondary side of the transformer Tj.
3. A multi-source DC-DC conversion circuit as claimed in claim 1 or 2, characterized in that: the multi-source DC-DC conversion circuit further comprises a buffer branch 1 to a buffer branch n, and the primary side of the transformer Tj is connected with the buffer branch j in parallel.
4. A multi-source DC-DC conversion circuit as claimed in claim 1 or 2, characterized in that: the direct-current voltage sources Vi1 to Vin are direct-current power generation systems or direct-current energy storage systems or cascade rectification circuits of alternating-current power generation systems or alternating-current energy storage systems.
5. A multi-source DC-DC conversion circuit as claimed in claim 1 or 2, characterized in that: the driving signals vg1 to vgn of the switches S1 to Sn are synchronous or asynchronous.
6. A multi-source DC-DC conversion circuit as claimed in claim 1 or 2, characterized in that: the parameters of the transformers T1 to Tn differ.
7. A multi-source DC-DC conversion circuit as claimed in claim 1 or 2, characterized in that: one or more of the diodes D1a to Dna, D1b to Dnb, and D1c to Dnc are replaced by synchronous rectification MOSFETs.
8. A multi-source DC-DC conversion circuit comprising a plurality of conversion units respectively connected to a plurality of DC voltage sources, a plurality of inductors, and a capacitor connected in parallel with a load, wherein each of the inductors and the capacitor has a first end and a second end, each conversion unit comprising:
the transformer is provided with a primary side and a secondary side, wherein the first end of the primary side is connected with the first end of a corresponding direct current voltage source;
the switch is provided with a first end and a second end, wherein the first end of the switch is connected with the second end of the primary side of the transformer, and the second end of the switch is connected with the second end of the corresponding direct-current voltage source;
the first diode is provided with an anode and a cathode, wherein the anode of the first diode is connected with the first end of the secondary side of the transformer, and the cathode of the first diode is connected with the first end of the capacitor;
the second diode is provided with an anode and a cathode, wherein the anode of the second diode is connected with the second end of the capacitor, and the cathode of the second diode is connected with the second end of the secondary side of the transformer; and
a third diode having an anode and a cathode, wherein the anode of the third diode is connected to the anode of the second diode and the cathode of the third diode is connected to the anode of the first diode;
the inductors are connected end to end, and the first end of each inductor is connected with the second end of the secondary side of the transformer in the corresponding transformation unit.
9. A multi-source DC-DC conversion circuit comprising a plurality of conversion units respectively connected to a plurality of DC voltage sources, a plurality of inductors, and a capacitor connected in parallel with a load, wherein each of the inductors and the capacitor has a first end and a second end, each conversion unit comprising:
the transformer is provided with a primary side and a secondary side, wherein the first end of the primary side is connected with the first end of a corresponding direct current voltage source;
the switch is provided with a first end and a second end, wherein the first end of the switch is connected with the second end of the primary side of the transformer, and the second end of the switch is connected with the second end of the corresponding direct-current voltage source;
the first diode is provided with an anode and a cathode, wherein the anode of the first diode is connected with the first end of the secondary side of the transformer, and the cathode of the first diode is connected with the first end of the capacitor;
the second diode is provided with an anode and a cathode, wherein the anode of the second diode is connected with the second end of the capacitor, and the cathode of the second diode is connected with the second end of the secondary side of the transformer; and
a third diode having an anode and a cathode, wherein the anode of the third diode is connected to the cathode of the second diode, and the cathode of the third diode is connected to the cathode of the first diode;
the inductors are connected end to end, and the first end of each inductor is connected with the first end of the secondary side of the transformer in the corresponding transformation unit.
10. A multi-source DC-DC conversion circuit as claimed in claim 8 or 9, wherein one or more of the first to third diodes is replaced by a synchronous rectification MOSFET.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101060285A (en) * 2007-03-16 2007-10-24 华为技术有限公司 A system and method for realizing the isolation of high frequency switch DC-DC conversion
WO2009039733A1 (en) * 2007-09-26 2009-04-02 Huawei Technologies Co., Ltd. Direct current converter power supply apparatus and method for improving direct current converter power supply apparatus
CN101902139A (en) * 2010-07-22 2010-12-01 浙江大学 Modularized multiple constant current output converter
CN108365760A (en) * 2018-04-12 2018-08-03 浙江大学 A kind of hybrid modulation isolated form doubleway output DC-DC converter
CN112908655A (en) * 2021-02-02 2021-06-04 浙江工业大学之江学院 Multi-input single-output distributed transformer and application circuit thereof
CN112908653A (en) * 2021-02-02 2021-06-04 浙江工业大学之江学院 Distributed transformer and application circuit thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101060285A (en) * 2007-03-16 2007-10-24 华为技术有限公司 A system and method for realizing the isolation of high frequency switch DC-DC conversion
WO2009039733A1 (en) * 2007-09-26 2009-04-02 Huawei Technologies Co., Ltd. Direct current converter power supply apparatus and method for improving direct current converter power supply apparatus
CN101902139A (en) * 2010-07-22 2010-12-01 浙江大学 Modularized multiple constant current output converter
CN108365760A (en) * 2018-04-12 2018-08-03 浙江大学 A kind of hybrid modulation isolated form doubleway output DC-DC converter
CN112908655A (en) * 2021-02-02 2021-06-04 浙江工业大学之江学院 Multi-input single-output distributed transformer and application circuit thereof
CN112908653A (en) * 2021-02-02 2021-06-04 浙江工业大学之江学院 Distributed transformer and application circuit thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
一种适用于两级DC/DC变换器的磁集成结构;陈怡;徐德鸿;伍晓峰;;电机与控制学报(第06期) *

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