CN107769592B - A kind of both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance - Google Patents

A kind of both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance Download PDF

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Publication number
CN107769592B
CN107769592B CN201711277567.3A CN201711277567A CN107769592B CN 107769592 B CN107769592 B CN 107769592B CN 201711277567 A CN201711277567 A CN 201711277567A CN 107769592 B CN107769592 B CN 107769592B
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inductance
power switch
diode
power
current transformer
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CN107769592A (en
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吴卫民
王侯清
安丽琼
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Shanghai Maritime University
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Shanghai Maritime University
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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
    • 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
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static 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
    • 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
    • H02M3/33592—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
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • 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 discloses a kind of both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance, belongs to field of power electronics.The both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance specifically includes that the first convertor circuit, the second convertor circuit, filter capacitor, control circuit and detection circuit；First convertor circuit includes the second power switch, the first inductance and first diode；Second convertor circuit includes third power switch, the second inductance, the first power switch, the 4th diode, the second diode, third diode and flat wave capacitor.Control circuit according to the detection circuit DC voltage acquired and the network voltage of power grid AC power source control first to third power switch on and off.According to the present invention, it exchanges and uses joint grounding structure between side and DC side, and only need three power switch, with high conversion efficiency, at low cost, DC side electric capacity of voltage regulation is small, exports the advantages such as DC voltage stability, practical.

Description

A kind of both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance
Technical field
The present invention relates to a kind of both ends shape of the mouth as one speaks AC/DC current transformer, in particular to a kind of AC/DC unsteady flow based on coupling inductance Device.
Background technique
AC/DC current transformer is mainly used for the exchange that the alternating current for exporting AC network or distributed generation system generate Direct current needed for electricity is transformed into direct-current micro-grid.In the prior art, the ground connection side applied to the AC/DC current transformer of direct-current micro-grid Formula can be generally divided into joint grounding structure, unilateral ground structure, virtual isolation ground structure etc..
Fig. 1 gives the joint grounding structure of AC/DC current transformer in direct-current micro-grid.In this configuration, ac high-voltage is first By splitting phase transformer T1It is reduced to the AC low-tension of 110V, then AC low-tension access AC/DC current transformer is subjected to ac/dc and is turned It changes, finally provides power to direct-current micro-grid.Wherein, AC low-tension system and direct-current micro-grid share ground wire.Joint grounding structure Advantage is that direct-current micro-grid can be easily mounted in original AC low-tension power grid, to constitute hybrid power system.Mixed It closes in electric system, low voltage equipment needs safe and reliable ground wire.But if without special or complicated AC/ DC current transformer provides ground wire, and most of low-voltage alternating-current system is not suitable for this structure.Simultaneously, it is desirable that direct-current micro-grid must be applicable in Bipolar voltage mapped structure in three ports.
Conventionally, as being limited by low-voltage equipment, direct-current micro-grid and the shared ground wire of low-voltage alternating-current system are tired Difficult.So many scholars consider unilateral ground structure.Fig. 2 shows the unilateral of double DC trunk is had in direct-current micro-grid Ground structure.In this configuration, ac high-voltage passes through step-down transformer T2It is transformed into the exchange of suitable AC/DC current transformer input Low pressure, then power is provided to direct-current micro-grid by AC/DC current transformer.Here step-down transformer T2Similar to isolating transformer, And it is usually forced down than the alternating current of standard for the alternating voltage that direct-current micro-grid provides.For example, a triphase step-down transformer It may export the line voltage of a 200V, rather than the 380V line voltage of a standard.In addition, according to direct voltage output function The needs of rate and rated power, AC/DC current transformer can be converted into AC power the dc power of different requirements.For example, straight Stream microgrid may be a single system for DC master row or the system of double DC trunk.
The advantages of this unilateral ground structure is the current transformer that AC/DC current transformer can use simple structure, such as two level 3-phase power converter or three level 3-phase power converter, or other current transformer.The disadvantage is that the output of step-down transformer It cannot be connected directly with the civilian load of other low-voltage alternating-currents, so the adaptability of direct-current micro-grid will receive limitation.
In the prior art, because of the presence of low-voltage equipment, to realize that mixing AC and DC network system is total to ground wire and is It is very difficult.Therefore, scholar proposes virtual isolation ground structure.As shown in Figure 3 a-3b, not according to transformer type Together, virtually isolation ground structure can be generally divided into two classes.
Fig. 3 a is shown based on Industrial Frequency Transformer T3Virtual isolation ground structure.The structure and unilateral ground structure phase Seemingly, but transformer and low-voltage alternating-current electric system connect herein, rather than high-voltage alternating system.Fig. 3 b is shown based on height Frequency power transformer T4Virtual isolation ground structure.It is compared with method shown in Fig. 3 a, high frequency transformer T has been used in Fig. 3 b4With two Current transformer.Due to wherein current transformer transfer efficiency with higher, so the high frequency transformer based on this method is with respect to power frequency It is more advantageous for voltage transformer system.
Although virtually isolation earthing mode can extremely flexibly adapt to the needs of direct-current micro-grid structure, the change used in it Depressor and multiple current transformers can reduce the transfer efficiency of whole system with additional power loss.
In direct-current micro-grid, if connecting AC electric power systems using virtual isolation ground structure, system can be reduced Transfer efficiency.If the adaptability of direct-current micro-grid will receive limitation using unilateral ground structure.So in the prior art, A kind of AC/DC current transformer of joint grounding structure is given, as shown in Figure 4.The AC/DC current transformer has efficiently, low cost, peace Complete reliable advantage.But there is also defects for the AC/DC current transformer.For example, due to power frequency positive half cycle or power frequency negative half period only There are the first convertor circuit or the work of the second convertor circuit, it is therefore desirable in the biggish flat wave electricity of output one capacity of DC side parallel Hold, so that output DC voltage keeps basicly stable.Simultaneously as the first output power and the second output power are equal, if The power difference in two DC loads absorption of DC output end is connect, then the first output DC voltage E1With the second output direct current Voltage E2Be difficult keep balance, and then be not able to satisfy the requirement of DC load stabilized input voltage.Please refer to Fig. 5 and figure 6, respectively BUCK (decompression) working state figure of the AC/DC current transformer of the joint grounding structure and BOOST (boosting) work shape State figure.If it is intended to solving the above problems, just a dc-voltage balance adjustment electricity must be increased in circuit shown in Fig. 4 Road, to increase cost.
The shortcomings that for AC/DC current transformer shown in Fig. 4 in the prior art, it is necessary to propose a kind of new A C/DC unsteady flow Device.
Summary of the invention
It is an object of the invention to propose a kind of safe, reliable, efficient AC/DC current transformer.
Both ends shape of the mouth as one speaks AC/DC current transformer provided by the invention based on coupling inductance, comprising: the first convertor circuit, second Convertor circuit, filter capacitor, control circuit and detection circuit；
First convertor circuit includes the second power switch, the first inductance and first diode；The exchange of current transformer is defeated Enter the first end that end is connected to the first inductance by first diode, the second end of the first inductance is connect by the second power switch Ground；
Second convertor circuit includes third power switch, the second inductance, the first power switch, the 4th diode, Two diodes, third diode and flat wave capacitor；Current transformer is connected to after 4th diode and the series connection of third power switch Ac input end and the second inductance second end between；The second end of second inductance also passes through the second diode ground connection； The first end of second inductance is grounded by the first power switch；The first end of second inductance also passes through third diode and is connected to directly Flow output end；Flat wave capacitor is connected in parallel between DC output end and ground；
First inductance is mutually coupled with the second inductance, and the first end of the first end of the first inductance and the second inductance For Same Name of Ends；
The filter capacitor is used to be filtered the alternating current of the first convertor circuit of input and the second convertor circuit；
The detection circuit is used to detect the DC voltage of DC output end output and the power grid electricity of power grid AC power source Pressure, and feed back to the control circuit；
The control circuit is used to send switch control signal to institute according to the DC voltage and network voltage of detection The controlled end of the first power switch to third power switch is stated, to control by first convertor circuit and the second convertor circuit structure At convertor circuit work in flyback, boosting and the operating mode of decompression.
In the both ends shape of the mouth as one speaks AC/DC current transformer according to the present invention based on coupling inductance, it is preferable that the control Circuit controls the convertor circuit work in power frequency positive half cycle in flyback mode, and in power frequency negative half period and DC voltage is higher than institute The convertor circuit work is controlled when stating the absolute value of network voltage instantaneous value in boost mode, in power frequency negative half period and direct current It forces down and controls the convertor circuit work when absolute value of the network voltage instantaneous value in decompression mode；Or the control Circuit controls the convertor circuit work in power frequency negative half period in flyback mode, and in power frequency positive half cycle and DC voltage is higher than institute The convertor circuit work is controlled when stating the absolute value of network voltage instantaneous value in boost mode, in power frequency positive half cycle and direct current It forces down and controls the convertor circuit work when absolute value of the network voltage instantaneous value in decompression mode.
In the both ends shape of the mouth as one speaks AC/DC current transformer according to the present invention based on coupling inductance, it is preferable that described first The anode of diode is connect with ac input end, and cathode is connect with the first end of the first inductance；The anode of second diode It is connect with the second end of the second inductance, minus earth；The anode of the third diode is connect with DC output end, cathode and The first end of two inductance connects；The cathode of 4th diode is connect with ac input end, and anode and third power switch connect It connects.Therefore, control circuit is when determining that DC voltage is higher than the absolute value of network voltage instantaneous value: in power frequency positive half cycle, making Second power switch high-frequency work, third and the first power switch disconnect；In power frequency negative half period, close third power switch It closes, the first power switch high-frequency work, the second power switch disconnects.Control circuit is determining DC voltage lower than network voltage wink When the absolute value of duration: in power frequency positive half cycle, making the second power switch high-frequency work, third and the first power switch disconnect； In power frequency negative half period, make third power switch high-frequency work, the second and first power switch disconnects.
In the both ends shape of the mouth as one speaks AC/DC current transformer according to the present invention based on coupling inductance, it is preferable that described first The cathode of diode is connect with ac input end, and anode is connect with the first end of the first inductance；The cathode of second diode It is connect with the second end of the second inductance, plus earth；The cathode of the third diode is connect with DC output end, anode and The first end of two inductance connects；The anode of 4th diode is connect with ac input end, and cathode and third power switch connect It connects.Correspondingly, control circuit is when determining that DC voltage is higher than the absolute value of network voltage instantaneous value: in power frequency negative half period, Make the second power switch high-frequency work, third and the first power switch disconnect；In power frequency positive half cycle, close third power switch It closes, the first power switch high-frequency work, the second power switch disconnects.Control circuit is determining DC voltage lower than network voltage wink When the absolute value of duration: in power frequency negative half period, making the second power switch high-frequency work, third and the first power switch disconnect； In power frequency positive half cycle, make third power switch high-frequency work, the second and first power switch disconnects.
In the both ends shape of the mouth as one speaks AC/DC current transformer according to the present invention based on coupling inductance, it is preferable that described to be based on The both ends shape of the mouth as one speaks AC/DC current transformer of coupling inductance further includes being connected between the power grid AC power source and the ac input end Third inductance.
In the both ends shape of the mouth as one speaks AC/DC current transformer according to the present invention based on coupling inductance, it is preferable that described first Power switch to third power switch is MOS type field-effect tube, insulated gate bipolar transistor or integrated gate commutated thyristor.
In the both ends shape of the mouth as one speaks AC/DC current transformer according to the present invention based on coupling inductance, it is preferable that described first Diode and the 4th diode are substituted by MOS type field-effect tube, insulated gate bipolar transistor or integrated gate commutated thyristor.
In the both ends shape of the mouth as one speaks AC/DC current transformer according to the present invention based on coupling inductance, it is preferable that described first Diode and the second power switch are integrated into entirety, and the 4th diode and third power switch are integrated into entirety, exhausted by inverse-impedance type The replacement of edge grid bipolar junction transistor.
First inductance and the second inductance are carried out coupling by the both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance of the invention It closes, and first to third power switch state is controlled according to DC output voltage, network voltage by control circuit, DC voltage to make convertor circuit export keeps stablizing.Three switch power devices are used only in AC/DC current transformer of the invention Part reduces the cost of system.
Detailed description of the invention
The specific embodiment part provided and referring to the drawings, the features and advantages of the present invention will become more It is readily appreciated that, in the accompanying drawings:
Fig. 1 is the joint grounding structure of prior art AC/DC current transformer；
Fig. 2 is the unilateral ground structure of prior art AC/DC current transformer；
Fig. 3 a is the virtual isolation ground structure based on Industrial Frequency Transformer of prior art AC/DC current transformer；
Fig. 3 b is the virtual isolation ground structure based on high frequency transformer of prior art AC/DC current transformer；
Fig. 4 is a kind of AC/DC current transformer of joint grounding structure of the prior art；
Fig. 5 is a kind of decompression working state figure of the AC/DC current transformer of joint grounding structure of the prior art；
Fig. 6 is a kind of boosting working state figure of the AC/DC current transformer of joint grounding structure of the prior art；
Fig. 7 is the convertor circuit of the both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance of first embodiment of the invention Schematic diagram；
Fig. 8 be first embodiment of the invention the both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance control circuit and The schematic diagram of detection circuit；
Fig. 9 is the convertor circuit of the both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance of second embodiment of the invention Schematic diagram；
100, the first convertor circuit；200, the second convertor circuit；300, detection circuit；400, control circuit；S1, the first function Rate switch；D1, first diode；L1, the first inductance；S2, the second power switch；D2, the second diode；D3, third diode；C, Flat wave capacitor；R, Equivalent DC loads；S3, third power switch；L2, the second inductance；D4, the 4th diode；Lg, third inductance； Cf, filter capacitor.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
For the defect for the AC/DC current transformer ground structure for being applied to direct-current micro-grid in the prior art, in particular for Fig. 4 Shown in joint grounding structure AC/DC current transformer existing for defect, the present invention provides a kind of both ends based on coupling inductance Shape of the mouth as one speaks AC/DC current transformer.Main thought of the invention is, will be in the first inductance and the second convertor circuit in the first convertor circuit The second inductance coupled, and the first end of the first end of the first inductance and the second inductance is Same Name of Ends；Then control electricity Road is according to detection circuit detected DC voltage E and network voltage Vg, to first to third power switch state into Row control, so as to so that the DC voltage stability of output is reliable.
The embodiment of the present invention is described in detail in 7-8 with reference to the accompanying drawing.Fig. 7 and Fig. 8 respectively illustrate the present invention The convertor circuit and control section schematic diagram of the both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance of first embodiment.This hair The AC/DC current transformer of bright first embodiment includes at least: the first convertor circuit 100, the second convertor circuit 200, filter capacitor Cf、 Detection circuit 300 and control circuit 400.First convertor circuit 100 and the second convertor circuit 200 constitute total convertor circuit.
First convertor circuit 100 includes the first inductance L1, the second power switch S2With first diode D1.The friendship of current transformer It flows input terminal and passes through first diode D1It is connected to the first inductance L1First end, the first inductance L1Second end pass through the second function Rate switch S2Ground connection.Preferably, in this first embodiment, first diode D1Anode and exchanging for power grid AC power source it is defeated Enter end connection, first diode D1Cathode and the first inductance L1First end be connected.
Second convertor circuit 200 includes third power switch S3, the second inductance L2, the first power switch S1, the 4th diode D4, the second diode D2, third diode D3With flat wave capacitor C.R is Equivalent DC load in Fig. 7.4th diode D4With Three power switch S3The ac input end and the second inductance L of current transformer are connected to after series connection2Second end between.Second inductance L2 Second end also pass through the second diode D2Ground connection.Second inductance L2First end pass through the first power switch S1Ground connection, the second electricity Feel L2First end also pass through third diode D3It is connected to DC output end.Flat wave capacitor C is connected in parallel on DC output end and ground Between.Preferably, in this first embodiment, the second diode D2Anode and the second inductance L2Second end connection, the two or two pole Pipe D2Minus earth；Third diode D3Anode connect with DC output end, third diode D3Cathode and the second inductance L2First end connection；4th diode D4Cathode connect with ac input end, the 4th diode D4Anode and third power Switch S3Connection.
First inductance L1With the second inductance L2It is mutually coupled, and the first inductance L1First end and the second inductance L2? One end is Same Name of Ends.
The ac input end of current transformer is connect with one end of power grid AC power source, the other end ground connection of power grid AC power source. Filter capacitor Cf, it is filtered for the alternating current to the first convertor circuit 100 of input and the second convertor circuit 200.Preferably, AC/DC current transformer in the embodiment of the present invention further includes being connected between power grid AC power source and the ac input end of current transformer Third inductance Lg.Filter capacitor CfOne end connect with ac input end, one end ground connection.
Detection circuit 300 is used to detect the convertor circuit i.e. DC voltage E and power grid alternating current of DC output end output The network voltage V in sourceg, and the DC voltage E and network voltage V that will testgIt is sent to control circuit 400.
Control circuit 400 is used for the DC voltage E and network voltage V detected according to detection circuit 300gTo current work Mode judges, to first to third power switch S1~S3Controlled end send switch control signal, to control convertor circuit Work is in flyback, boosting and the operating mode of decompression.Preferably, the detection circuit 300 is also used to detect power grid AC power source Power grid export electric current ig, and it is sent to control circuit 400.Control circuit 400 is also used to root when sending switch control signal The duty ratio of switch control signal is determined according to circuit parameter.Specifically, control circuit 400 is used to be exported according to DC output end DC voltage E and reference DC voltage ErefIt is compared, gives its error to DC voltage outer ring controller；Outside DC voltage The output result of ring controller exports electric current i with the power grid fed back to again multiplied by a sinusoidal signalgIt is compared, by its error Give alternating current inner loop control device；Last control circuit 400 is opened according to the determination of the output result of alternating current inner loop control device Close the duty ratio of control signal.
In the first embodiment, control circuit 400 controls convertor circuit work in power frequency positive half cycle in flyback mode, Power frequency negative half period and DC voltage E are higher than the network voltage VgInstantaneous value absolute value when control convertor circuit work rising Die pressing type, in the absolute value for the instantaneous value that power frequency negative half period and DC voltage are lower than network voltage, control convertor circuit work exists Decompression mode.
Specifically, control circuit 400 is when determining DC voltage E is higher than (containing being equal to) network voltage VgInstantaneous value it is absolute It is performed the following operation when value:
In power frequency positive half cycle, so that the first convertor circuit 100 is worked in flyback mode, specifically include: the second power switch S2High-frequency work, third power switch S3With the first power switch S1It disconnects；In power frequency negative half period, make the second convertor circuit 200 Boost mode is worked in, is specifically included: making third power switch S3Closure, the first power switch S1High-frequency work, the second power are opened Close S2It disconnects.
Control circuit 400 is lower than network voltage V as determining DC voltage EgInstantaneous value absolute value when carry out following behaviour Make:
In power frequency positive half cycle, so that the first convertor circuit 100 is worked in flyback mode, specifically include: the second power switch S2High-frequency work, third power switch S3With the first power switch S1It disconnects；In power frequency negative half period, make the second convertor circuit 200 Decompression mode is worked in, is specifically included: third power switch S3High-frequency work, the second power switch S2With the first power switch S1 It disconnects.
In the embodiment of the present invention, in power frequency positive half cycle, third power switch S3With the first power switch S1It disconnects.Pass through In the first inductance L1Energy storage stage be closed the second power switch S2, so that power grid AC power source and the first inductance L1Constitute closure Circuit, and then strengthen the energy storage in coupling inductance.And in the first inductance L1Release can the stage, disconnect the second power switch S2, The energy being stored in coupling inductance is set to be supplied to Equivalent DC load R in a manner of flyback.By controlling above, ensure The stability of AC/DC current transformer DC load both end voltage.
In the embodiment of the present invention, by coupling the first inductance with the second inductance, is detected and obtained by detection circuit Convertor circuit output DC voltage, then by control circuit control first to third power switch state, so as to The normal operation of AC/DC current transformer is ensured under various operating conditions.Both ends shape of the mouth as one speaks AC/DC current transformer of the invention is compared with prior art For, since required number of devices is few, and joint grounding structure is used, both reduced costs and the ripple rate of DC voltage, The safety of AC/DC current transformer is improved again.
In the embodiment of the present invention, first to third power switch can use MOS type field-effect tube (MOSFET), insulated gate Bipolar junction transistor (IGBT) or integrated gate commutated thyristor (IGCT) etc. are realized.Preferably, the first power switch S1Extremely Third power switch S3It is all made of N-channel MOS type field-effect tube (MOSFET).By using MOS type field-effect tube as switch Device can further decrease conduction loss.
In this embodiment, first diode D1With the second power switch S2Physical location, the 4th diode D4And third Power switch S3Physical location can be interchanged.First diode D1With the second power switch S2It is integrated into entirety, the 4th diode D4With third power switch S3It is integrated into entirety, can also be replaced using an inverse-impedance type insulated gate bipolar transistor, Ke Yijin The number of one step reduction device.First diode D1With the 4th diode D4Corresponding MOS type field-effect tube can be used (MOSFET), insulated gate bipolar transistor (IGBT) or integrated gate commutated thyristor (IGCT) replace, for example, by using N ditch Road MOS type field-effect tube replaces, to further decrease conduction loss.
As shown in figure 9, for unsteady flow in the both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance of second embodiment of the invention The schematic diagram of circuit.The second embodiment provides another topological structure.Compared with Fig. 7, other than polarity of voltage is different, Working principle and operating mode are identical as Fig. 7.Difference place is, wherein preferably, in this second embodiment, the one or two Pole pipe D1Cathode connect with ac input end, anode and the first inductance L1First end connection；Second diode D2Cathode with Second inductance L2Second end connection, the second diode D2Plus earth；Third diode D3Cathode and DC output end connect It connects, third diode D3Anode and the second inductance L2First end connection；4th diode D4Anode and ac input end connect It connects, the 4th diode D4Cathode and third power switch S3Connection.
In this second embodiment, correspondingly, control circuit 400 controls convertor circuit work in power frequency negative half period anti- Energizing mode, in power frequency positive half cycle and DC voltage E is higher than the network voltage VgInstantaneous value absolute value when control unsteady flow electricity Road work is in boost mode, and in power frequency positive half cycle and DC voltage E is lower than network voltage VgInstantaneous value absolute value when control Convertor circuit works in decompression mode.
Specifically, control circuit 400 is when determining DC voltage E is higher than (containing being equal to) network voltage VgInstantaneous value it is absolute It is performed the following operation when value:
In power frequency negative half period, so that the first convertor circuit 100 is worked in flyback mode, specifically include: the second power switch S2High-frequency work, third power switch S3With the first power switch S1It disconnects；In power frequency positive half cycle, make the second convertor circuit 200 Boost mode is worked in, is specifically included: making third power switch S3Closure, the first power switch S1High-frequency work, the second power are opened Close S2It disconnects.
Control circuit 400 is lower than network voltage V as determining DC voltage EgInstantaneous value absolute value when carry out following behaviour Make:
In power frequency negative half period, so that the first convertor circuit 100 is worked in flyback mode, specifically include: the second power switch S2High-frequency work, third power switch S3With the first power switch S1It disconnects；In power frequency positive half cycle, make the second convertor circuit 200 Decompression mode is worked in, is specifically included: third power switch S3High-frequency work, the second power switch S2With the first power switch S1 It disconnects.
In conclusion using joint grounding structure between exchange side of the invention and DC side, and three power is only needed to open It closes, with high conversion efficiency, at low cost, DC side electric capacity of voltage regulation is small, exports the advantages such as DC voltage stability, practical.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features； And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (14)

1. a kind of both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance, which is characterized in that the both ends based on coupling inductance Shape of the mouth as one speaks AC/DC current transformer includes: the first convertor circuit, the second convertor circuit, filter capacitor, control circuit and detection circuit；
First convertor circuit includes the second power switch, the first inductance and first diode；The ac input end of current transformer The first end of the first inductance is connected to by first diode, the second end of the first inductance is grounded by the second power switch；
Second convertor circuit includes third power switch, the second inductance, the first power switch, the 4th diode, the two or two Pole pipe, third diode and flat wave capacitor；The friendship of current transformer is connected to after 4th diode and the series connection of third power switch It flows between input terminal and the second end of the second inductance；The second end of second inductance also passes through the second diode ground connection；Second The first end of inductance is grounded by the first power switch；The first end of second inductance also passes through third diode, and to be connected to direct current defeated Outlet；Flat wave capacitor is connected in parallel between DC output end and ground；
First inductance is mutually coupled with the second inductance, and the first end of the first inductance and the first end of the second inductance are same Name end；
The filter capacitor is used to be filtered the alternating current of the first convertor circuit of input and the second convertor circuit；
The detection circuit is used to detect the DC voltage of DC output end output and the network voltage of power grid AC power source, And feed back to the control circuit；
The control circuit is used to send switch control signal to described the according to the DC voltage and network voltage of detection One power switch is made of with control first convertor circuit and the second convertor circuit to the controlled end of third power switch Convertor circuit works in flyback, boosting and the operating mode of decompression；
The anode of the first diode is connect with ac input end, and cathode is connect with the first end of the first inductance；Described second The anode of diode is connect with the second end of the second inductance, minus earth；The anode and DC output end of the third diode Connection, cathode are connect with the first end of the second inductance；The cathode of 4th diode is connect with ac input end, anode and The connection of three power switch.
2. the both ends shape of the mouth as one speaks AC/DC current transformer according to claim 1 based on coupling inductance, it is characterised in that:
The control circuit controls the convertor circuit work in power frequency positive half cycle in flyback mode, in power frequency negative half period and directly Galvanic electricity pressure controls the convertor circuit work in boost mode when being higher than the absolute value of the network voltage instantaneous value, bear in power frequency Half cycle and DC voltage control the convertor circuit and work in decompression mode when being lower than the absolute value of the network voltage instantaneous value； Or
The control circuit controls the convertor circuit work in power frequency negative half period in flyback mode, in power frequency positive half cycle and directly Galvanic electricity pressure controls convertor circuit work in boost mode when being higher than the absolute value of the network voltage instantaneous value, power frequency just Half cycle and DC voltage control the convertor circuit and work in decompression mode when being lower than the absolute value of the network voltage instantaneous value.
3. the both ends shape of the mouth as one speaks AC/DC current transformer according to claim 1 based on coupling inductance, it is characterised in that:
The control circuit is when determining that DC voltage is higher than the absolute value of network voltage instantaneous value: in power frequency positive half cycle, making Second power switch high-frequency work, third and the first power switch disconnect；In power frequency negative half period, close third power switch It closes, the first power switch high-frequency work, the second power switch disconnects；
The control circuit is when determining that DC voltage is lower than the absolute value of network voltage instantaneous value: in power frequency positive half cycle, making Second power switch high-frequency work, third and the first power switch disconnect；In power frequency negative half period, make third power switch high frequency Work, the second and first power switch disconnect.
4. the both ends shape of the mouth as one speaks AC/DC current transformer described in any one of claim 1 to 3 based on coupling inductance, feature It is, the both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance further includes being connected to the power grid AC power source and described Third inductance between ac input end.
5. the both ends shape of the mouth as one speaks AC/DC current transformer described in any one of claim 1 to 3 based on coupling inductance, feature It is, first power switch to third power switch is MOS type field-effect tube, insulated gate bipolar transistor or integrated door Pole commutated thyristor.
6. the both ends shape of the mouth as one speaks AC/DC current transformer described in any one of claim 1 to 3 based on coupling inductance, feature It is, the first diode and the 4th diode are changed by MOS type field-effect tube, insulated gate bipolar transistor or integral gate Flow thyristor substitution.
7. the both ends shape of the mouth as one speaks AC/DC current transformer described in any one of claim 1 to 3 based on coupling inductance, feature It is, the first diode and the second power switch are integrated into entirety, and the 4th diode and third power switch are integrated into whole Body is replaced by inverse-impedance type insulated gate bipolar transistor.
8. a kind of both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance, which is characterized in that the both ends based on coupling inductance Shape of the mouth as one speaks AC/DC current transformer includes: the first convertor circuit, the second convertor circuit, filter capacitor, control circuit and detection circuit；
First convertor circuit includes the second power switch, the first inductance and first diode；The ac input end of current transformer The first end of the first inductance is connected to by first diode, the second end of the first inductance is grounded by the second power switch；
Second convertor circuit includes third power switch, the second inductance, the first power switch, the 4th diode, the two or two Pole pipe, third diode and flat wave capacitor；The friendship of current transformer is connected to after 4th diode and the series connection of third power switch It flows between input terminal and the second end of the second inductance；The second end of second inductance also passes through the second diode ground connection；Second The first end of inductance is grounded by the first power switch；The first end of second inductance also passes through third diode, and to be connected to direct current defeated Outlet；Flat wave capacitor is connected in parallel between DC output end and ground；
First inductance is mutually coupled with the second inductance, and the first end of the first inductance and the first end of the second inductance are same Name end；
The filter capacitor is used to be filtered the alternating current of the first convertor circuit of input and the second convertor circuit；
The detection circuit is used to detect the DC voltage of DC output end output and the network voltage of power grid AC power source, And feed back to the control circuit；
The control circuit is used to send switch control signal to described the according to the DC voltage and network voltage of detection One power switch is made of with control first convertor circuit and the second convertor circuit to the controlled end of third power switch Convertor circuit works in flyback, boosting and the operating mode of decompression；
The cathode of the first diode is connect with ac input end, and anode is connect with the first end of the first inductance；Described second The cathode of diode is connect with the second end of the second inductance, plus earth；The cathode and DC output end of the third diode Connection, anode are connect with the first end of the second inductance；The anode of 4th diode is connect with ac input end, cathode and The connection of three power switch.
9. the both ends shape of the mouth as one speaks AC/DC current transformer according to claim 8 based on coupling inductance, it is characterised in that:
The control circuit controls the convertor circuit work in power frequency positive half cycle in flyback mode, in power frequency negative half period and directly Galvanic electricity pressure controls the convertor circuit work in boost mode when being higher than the absolute value of the network voltage instantaneous value, bear in power frequency Half cycle and DC voltage control the convertor circuit and work in decompression mode when being lower than the absolute value of the network voltage instantaneous value； Or
The control circuit controls the convertor circuit work in power frequency negative half period in flyback mode, in power frequency positive half cycle and directly Galvanic electricity pressure controls convertor circuit work in boost mode when being higher than the absolute value of the network voltage instantaneous value, power frequency just Half cycle and DC voltage control the convertor circuit and work in decompression mode when being lower than the absolute value of the network voltage instantaneous value.
10. the both ends shape of the mouth as one speaks AC/DC current transformer according to claim 8 based on coupling inductance, it is characterised in that:
The control circuit is when determining that DC voltage is higher than the absolute value of network voltage instantaneous value: in power frequency negative half period, making Second power switch high-frequency work, third and the first power switch disconnect；In power frequency positive half cycle, close third power switch It closes, the first power switch high-frequency work, the second power switch disconnects；
The control circuit is when determining that DC voltage is lower than the absolute value of network voltage instantaneous value: in power frequency negative half period, making Second power switch high-frequency work, third and the first power switch disconnect；In power frequency positive half cycle, make third power switch high frequency Work, the second and first power switch disconnect.
11. the both ends shape of the mouth as one speaks AC/DC current transformer according to any one of claims 8 to 10 based on coupling inductance, special Sign is that the both ends shape of the mouth as one speaks AC/DC current transformer based on coupling inductance further includes being connected to the power grid AC power source and institute State the third inductance between ac input end.
12. the both ends shape of the mouth as one speaks AC/DC current transformer according to any one of claims 8 to 10 based on coupling inductance, special Sign is that first power switch to third power switch is MOS type field-effect tube, insulated gate bipolar transistor or integrated Door pole stream-exchanging thyristor.
13. the both ends shape of the mouth as one speaks AC/DC current transformer according to any one of claims 8 to 10 based on coupling inductance, special Sign is that the first diode and the 4th diode are by MOS type field-effect tube, insulated gate bipolar transistor or integral gate Commutated thyristor substitution.
14. the both ends shape of the mouth as one speaks AC/DC current transformer according to any one of claims 8 to 10 based on coupling inductance, special Sign is that the first diode and the second power switch are integrated into entirety, and the 4th diode and third power switch are integrated into It is whole, it is replaced by inverse-impedance type insulated gate bipolar transistor.
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