CN110299825B - Parallel current equalizing system for switching devices - Google Patents
Parallel current equalizing system for switching devices Download PDFInfo
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- CN110299825B CN110299825B CN201810241776.0A CN201810241776A CN110299825B CN 110299825 B CN110299825 B CN 110299825B CN 201810241776 A CN201810241776 A CN 201810241776A CN 110299825 B CN110299825 B CN 110299825B
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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
- 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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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Abstract
A switching device parallel current sharing system, comprising: the parallel-connection module of the switching device comprises at least two switching devices which are connected in parallel, the current-sharing module of the transformer comprises at least one transformer, the first ends of the switching devices are all connected with the input end of the current-sharing module of the transformer, the control ends of the switching devices are all connected with the output end of the current-sharing module of the transformer so as to control the currents flowing through the switching devices to be equal, and the second ends of the switching devices are grounded. By connecting the control ends of the parallel switching devices to the two ends of the secondary coil of the transformer, the parallel switching device current sharing system is forced to equalize the currents of the parallel switching devices. Further, the switching times of the switching devices are also forced to be synchronized.
Description
Technical Field
The invention relates to the field of switching devices, in particular to a parallel current sharing system of switching devices.
Background
In a power conversion circuit, an electronic switching device such as an IGBT is used in parallel. In order to reduce parameter dispersion among switching devices, in parallel application, IGBTs with good consistency are generally adopted in parallel connection, the consistency of distribution parameters among all IGBTs is ensured in circuit design and layout, and the same manufacturer and model are controlled in production. However, such an approach inevitably causes a parallel non-uniform current phenomenon due to device dispersion and dispersion of peripheral device parameters, and is unpredictable with respect to the degree of parameter dispersion.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a parallel current sharing system of the switching devices, which can forcedly share current of the parallel switching devices, aiming at the defects in the prior art.
The technical scheme adopted for solving the technical problems is as follows: a parallel current sharing system of switching devices is constructed, comprising: the parallel-connection module of the switching device comprises at least two switching devices which are connected in parallel, the current-sharing module of the transformer comprises at least one transformer, the first ends of the switching devices are all connected with the input end of the current-sharing module of the transformer, the control ends of the switching devices are all connected with the output end of the current-sharing module of the transformer so as to control the currents flowing through the switching devices to be equal, and the second ends of the switching devices are grounded.
In the parallel current sharing system of the switching devices, the parallel switching device module comprises a first switching device and a second switching device which are connected in parallel, the transformer current sharing module comprises a first transformer, the first transformer comprises a first transformer secondary side coil, a first transformer primary side first coil and a first transformer primary side second coil, a control end of the first switching device is connected to a first end of the first transformer secondary side coil, a control end of the second switching device is connected to a second end of the first transformer secondary side coil, a first end of the first switching device is connected to a first end of the first transformer primary side first coil, a first end of the second switching device is connected to a second end of the first transformer primary side second coil, a second end of the first transformer primary side first coil is connected to a first end of the first transformer primary side second coil, and a second end of the first switching device and a second end of the second switching device are both grounded.
In the parallel current sharing system of the switching devices, the turns ratio of the primary side first coil of the first transformer to the primary side second coil of the first transformer is 1:1.
In the parallel current sharing system of the switching devices, the parallel switching device module further comprises a third switching device connected with the first switching device and the second switching device in parallel, the transformer current sharing module comprises a second transformer, the second transformer comprises a second transformer secondary side coil, a second transformer primary side first coil and a second transformer primary side second coil, the midpoint of the first transformer secondary side coil is connected with the first end of the second transformer primary side first coil, the control end of the third switching device is connected with the second end of the second transformer secondary side coil, the first end of the third switching device is connected with the second end of the second transformer primary side second coil, the first end of the second transformer primary side second coil is connected with the second end of the second transformer primary side first coil, the first end of the second transformer primary side first coil is connected with the first end of the first transformer primary side first coil and the second end of the second transformer primary side second coil, and the third switching device is connected with the second end of the second transformer primary side first end of the second transformer.
In the parallel current sharing system of the switching devices, the turns ratio of the primary side first coil of the first transformer to the primary side second coil of the first transformer is 1:1; the turns ratio of the primary side first coil of the second transformer to the primary side second coil of the second transformer is 1:2.
In the parallel current equalizing system of the switching devices, the switching device parallel module further comprises a fourth switching device, a second switching device and a third transformer, wherein the fourth switching device is connected with the first switching device in parallel with the second switching device, the transformer current equalizing module comprises a third transformer, a first transformer and a second transformer, and the N is a positive integer greater than 4.
In the parallel current equalizing system of the switching devices, the parallel switching device module further comprises a third switching device and a fourth switching device which are connected in parallel, the transformer current equalizing module comprises a second transformer and a third transformer, the third switching device and the fourth switching device which are connected in parallel with the first switching device and the second switching device which are connected in parallel, the second transformer comprises a second transformer secondary winding, a second transformer primary winding and a second transformer primary winding, the third transformer comprises a third transformer secondary winding, a third transformer primary winding and a third transformer primary winding, the control end of the third switching device is connected to the first end of the second transformer secondary winding, the control end of the fourth switching device is connected to the second end of the second transformer secondary winding, the first end of the third switching device is connected to the first end of the second transformer primary winding, the second end of the fourth switching device is connected to the second end of the second transformer primary winding, and the fourth switching device is connected to the first end of the second transformer primary winding; the midpoint of the secondary coil of the first transformer is connected with the first end of the secondary coil of the third transformer, the midpoint of the secondary coil of the second transformer is connected with the second end of the secondary coil of the third transformer, the second end of the primary first coil of the first transformer and the first end of the primary second coil of the first transformer are connected with the first end of the primary first coil of the third transformer, the second end of the primary first coil of the second transformer and the first end of the primary second coil of the second transformer are connected with the second end of the primary second coil of the third transformer, and the first end of the primary second coil of the third transformer is connected with the second end of the primary first coil of the third transformer.
In the parallel current sharing system of the switching devices, the turns ratio of the primary side first coil of the first transformer to the primary side second coil of the first transformer is 1:1; the turns ratio of the primary side first coil of the second transformer to the primary side second coil of the second transformer is 1:1; the turns ratio of the primary side first coil of the third transformer to the primary side second coil of the third transformer is 1:1.
The parallel current sharing system of the switching device further comprises a load diode and a load inductor, wherein the load diode and the load inductor are connected between the transformer current sharing module and a power supply, the cathode of the load diode is connected with the power supply, the anode of the load diode is connected with the input end of the transformer current sharing module, one end of the load inductor is connected with the power supply, and the other end of the load inductor is connected with the input end of the transformer current sharing module.
In the parallel current sharing system of the switching devices, the switching devices comprise IGBT and MOSFET, and the transformer is a magnetic ring transformer.
By connecting the control ends of the parallel switching devices to the two ends of the secondary coil of the transformer, the parallel switching device current sharing system is forced to equalize the currents of the parallel switching devices. Further, the switching times of the switching devices are also forced to be synchronized.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic block diagram of a first embodiment of a switching device parallel current sharing system of the present invention;
fig. 2 is a circuit diagram of a second embodiment of the switching device parallel current sharing system of the present invention;
fig. 3 is a circuit diagram of a third embodiment of a switching device parallel current sharing system of the present invention;
fig. 4 is a circuit diagram of a fourth embodiment of the switching device parallel current sharing system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a schematic block diagram of a first embodiment of a switching device parallel current sharing system of the present invention. As shown in fig. 1, the parallel current sharing system of the switching device of the present invention includes: a switching device parallel module 100 and a transformer current sharing module 200. The switching device parallel module 100 includes at least two switching devices connected in parallel with each other. In a preferred embodiment of the invention, two or more switching devices may be included in parallel with each other. The transformer current sharing module 200 includes at least one transformer. Preferably, the transformer comprises one secondary winding and two primary windings. The input end of the transformer current equalizing module 200 is arranged at one side of the primary coil, and the output end of the transformer current equalizing module 200 is arranged at one side of the secondary coil.
As shown in fig. 1, the first ends of the switching devices are all connected to the input end of the transformer current equalizing module 200, and the second ends are grounded. Meanwhile, the control ends of the switching devices are connected with the output ends of the transformer current equalizing module 200. Thus, if the currents on the switching devices are equal, the currents flowing into the input terminals of the transformer current sharing module 200 by the switching devices are equal, and the output terminals of the transformer current sharing module 200 will not output. If the currents on the switching devices are not equal, the currents flowing into the input ends of the transformer current sharing module 200 are not equal, and then the output ends of the transformer current sharing module 200 will have currents output to the control ends of the two switching devices, so as to control the currents of the two switching devices to be equal.
In this embodiment, the switching device may be any switching device such as an IGBT tube and a MOSFET tube. The transformer can be a magnetic ring transformer and comprises a magnetic ring and a penetrating wire sleeved on the magnetic ring. It will be appreciated by those skilled in the art that in other preferred embodiments of the present invention, the switching device may be constructed using any switching device known in the art, such as a switching tube, etc., and the transformer may be any current transformer. According to the parallel current equalizing system for the switching devices, the control ends of the parallel switching devices are connected to the two ends of the secondary side coil of the transformer, so that currents of the parallel switching devices are forced to be equal. Further, the switching times of the switching devices are also forced to be synchronized.
Fig. 2 is a circuit diagram of a second embodiment of the switching device parallel current sharing system of the present invention. As shown in fig. 2, the parallel current equalizing system for switching devices of the present invention includes: a switching device parallel module 100 and a transformer current sharing module 200. The switching device parallel module 100 includes a first IGBT tube Q1 and a second IGBT tube Q2 connected in parallel to each other. The transformer current equalizing module 200 includes a first transformer T1. The first transformer T1 comprises a first transformer secondary coil L1, a first transformer primary first coil L2 and a first transformer primary second coil L3. The gate terminal of the first IGBT tube Q1 is connected to the first end A of the first transformer secondary coil L1, and the gate terminal of the second IGBT tube Q2 is connected to the second end B of the first transformer secondary coil L1. The collector of the first IGBT tube Q1 is connected with the first end C of the first coil L2 of the primary side of the first transformer, the collector of the second IGBT tube Q2 is connected with the second end E of the second coil L3 of the primary side of the first transformer, and the second end of the first coil L2 of the primary side of the first transformer and the first end of the second coil L3 of the primary side of the first transformer are connected to form a D end. The emitters of the first IGBT tube Q1 and the second IGBT tube Q2 are grounded. In this embodiment, the turns ratio of the primary side first coil L2 of the first transformer and the primary side second coil L3 of the first transformer is 1:1.
In the preferred embodiment shown in fig. 2, the switching device parallel current sharing system of the present invention further includes a load diode D1 and a load inductance L0 connected between the transformer current sharing module 200 and the power source VCC. The cathode of the load diode D1 is connected with the power supply VCC, the anode of the load diode D is connected with the end D, one end of the load inductor L0 is connected with the power supply VCC, and the other end of the load inductor L0 is connected with the end D.
In the preferred embodiment shown in fig. 2, the parallel current equalizing system for switching devices of the present invention further includes resistors R1-R3, wherein the resistor R1 is connected between the gate of the first IGBT tube Q1 and the control signal receiving terminal, the resistor R2 is connected between the gate of the second IGBT tube Q2 and the control signal receiving terminal, and the resistor R3 is connected between the second terminal B of the first transformer secondary coil L1 and the gate of the second IGBT tube Q2.
In this embodiment, collector currents of the first IGBT tube Q1 and the second IGBT tube Q2 are negatively fed back, and collector current differential signals of the first IGBT tube Q1 and the second IGBT tube Q2 connected in parallel are led into T gates of the first IGBT tube Q1 and the second IGBT tube Q2 as output voltages through a transformer T1, so that current sharing of the first IGBT tube Q1 and the second IGBT tube Q2 connected in parallel is forced.
In this embodiment, when the currents of the first IGBT tube Q1 and the second IGBT tube Q2 are equal, the first primary winding L2 of the first transformer and the second primary winding L3 of the first transformer cancel each other, and when the currents of the first IGBT tube Q1 and the second IGBT tube Q2 are unequal, the first secondary winding L1 of the first transformer T1 has a voltage signal output, and is applied to the gates of the first IGBT tube Q1 and the second IGBT tube Q2, so that the gate voltage of the IGBT tube with the larger collector current among the first IGBT tube Q1 and the second IGBT tube Q2 is reduced, and the gate voltage of the IGBT tube with the smaller collector current is raised, so that the currents of the first IGBT tube Q1 and the second IGBT tube Q2 are finally equalized.
In a preferred embodiment of the present invention, the first transformer T1 may be formed of a magnetic ring and a through wire, and the first transformer primary side first coil L2 and the first transformer primary side second coil L3 may correspond to single gate coils. When the current of the first IGBT tube Q1 and the current of the second IGBT tube Q2 are required to be equal, the turns ratio of the first transformer primary side first coil L2 and the first transformer primary side second coil L3 is 1:1. When the current of the first IGBT tube Q1 and the current of the second IGBT tube Q2 are required to be in a certain proportion, the turns ratio of the first primary winding L2 of the first transformer and the second primary winding L3 of the first transformer may be adjusted to be a set proportion. Those skilled in the art will appreciate that the first transformer T1, the first IGBT tube Q1, and the second IGBT tube Q2 are merely illustrative, and that other types of switching devices and current transformers may be used with the present invention.
Compared with the actual measurement of the parallel circuit of the switching device, the current-sharing condition caused by the device parameter difference and the driving circuit difference can reach 60% or more generally, and after the parallel current-sharing system of the switching device is adopted, the current-sharing degree is reduced to be within 3%, and the switching time is forced to be synchronous.
By connecting the control ends of the parallel switching devices to the two ends of the secondary coil of the transformer, the parallel switching device current sharing system is forced to equalize the currents of the parallel switching devices. Further, the switching times of the switching devices are also forced to be synchronized.
Fig. 3 is a circuit diagram of a third embodiment of the switching device parallel current sharing system of the present invention. As shown in fig. 3, the parallel current equalizing system for switching devices of the present invention includes: a switching device parallel module 100 and a transformer current sharing module 200. The switching device parallel module 100 includes a first IGBT tube Q1, a second IGBT tube Q2, and a third IGBT tube Q3 connected in parallel to each other. The transformer current equalizing module 200 includes a first transformer T1 and a second transformer T2. The first transformer T1 comprises a first transformer secondary coil L1, a first transformer primary first coil L2 and a first transformer primary second coil L3. The second transformer comprises a second transformer secondary coil L1', a second transformer primary first coil L2' and a second transformer primary second coil L3'. The gate terminal of the first IGBT tube Q1 is connected to the first terminal A of the first transformer secondary coil L1, and the gate terminal of the second IGBT tube Q2 is connected to the second terminal B of the first transformer secondary coil L1 through a resistor R3. The gate terminal of the third IGBT tube Q3 is connected to the second terminal B 'of the second transformer secondary winding L1'. The collector of the first IGBT tube Q1 is connected with the first end C of the primary side first coil L2 of the first transformer, and the collector of the second IGBT tube Q2 is connected with the second end E of the primary side second coil L3 of the first transformer. And the collector electrode of the third IGBT tube Q3 is connected with the second end E 'of the primary side second coil L3' of the second transformer. The second end of the primary side first coil L2 of the first transformer is connected with the first end of the primary side second coil L3 of the first transformer to form a D end, and the D end is connected with the first end C 'of the primary side first coil L2' of the second transformer. The midpoint of the first transformer secondary winding L1 is connected to the first end a 'of the second transformer secondary winding L1'. The emitters of the first IGBT tube Q1, the second IGBT tube Q2 and the third IGBT tube Q3 are grounded. The first end of the second coil L3' on the primary side of the second transformer and the second end of the first coil L2' on the primary side of the second transformer are connected to the end D '.
In the preferred embodiment shown in fig. 3, the switching device parallel current sharing system of the present invention further includes a load diode D1 and a load inductance L0 connected between the transformer current sharing module 200 and the power source VCC. The cathode of the load diode D1 is connected with the power supply VCC, the anode of the load diode D1 is connected with the end D ', one end of the load inductor L0 is connected with the power supply VCC, and the other end of the load inductor L0 is connected with the end D'.
In the preferred embodiment shown in fig. 3, the parallel current sharing system of the switching device of the present invention further includes resistors R1, R2 and R4, wherein the resistor R1 is connected between the gate of the first IGBT tube Q1 and the control signal receiving terminal, the resistor R2 is connected between the gate of the second IGBT tube Q2 and the control signal receiving terminal, and the resistor R4 is connected between the gate of the third IGBT tube Q3 and the control signal receiving terminal.
In this embodiment, the manner of controlling the first IGBT tube Q1, the second IGBT tube Q2, and the third IGBT tube Q3 is similar to the embodiment shown in fig. 2. Based on the teachings of the embodiment shown in fig. 2, one skilled in the art can implement the embodiment shown in fig. 3, and will not be further described herein. In the embodiment shown in fig. 3, the turns ratio of the primary side first coil L2 of the first transformer to the primary side second coil L3 of the first transformer is 1:1; the turns ratio of the primary side first coil L2 'of the second transformer to the primary side second coil L3' of the second transformer is 1:2.
In a further preferred embodiment of the present invention, the switching device parallel module 100 further includes a first IGBT tube Q1, the second IGBT tube Q2, a third IGBT tube Q3, and fourth IGBT tube Q4 … and an nth IGBT tube QN connected in parallel to each other. The transformer current equalizing module 200 includes a first transformer T1, a second transformer T2 …, and an N-1 transformer, where N is a positive integer greater than 4. In this embodiment, the turns ratio of the primary first coil L2 of the first transformer and the primary second coil L3 of the first transformer is 1:1; the turns ratio of the primary side first coil L2 'of the second transformer to the primary side second coil L3' of the second transformer is 1:2. The turns ratio of the primary side first coil L2N of the N-1 transformer to the primary side second coil L3N of the second transformer is 1 (N-1). Those skilled in the art will be able to implement the above embodiments based on the teachings of the embodiments shown in fig. 2-3, and will not be further described herein.
By connecting the control ends of the parallel switching devices to the two ends of the secondary coil of the transformer, the parallel switching device current sharing system is forced to equalize the currents of the parallel switching devices. Further, the switching times of the switching devices are also forced to be synchronized.
Fig. 4 is a circuit diagram of a fourth embodiment of the switching device parallel current sharing system of the present invention. In this embodiment, the parallel current sharing system for switching devices of the present invention includes: a switching device parallel module 100 and a transformer current sharing module 200. The switching device parallel module 100 includes a first IGBT tube Q1, a second IGBT tube Q2, and a third IGBT tube Q3 and a fourth IGBT tube Q4 connected in parallel with each other. The third IGBT tube Q3 and the fourth IGBT tube Q4 connected in parallel with each other and the first IGBT tube Q1 and the second IGBT tube Q2 connected in parallel with each other are connected in parallel with each other. The transformer current equalizing module 200 includes a first transformer T1, a second transformer T2, and a third transformer T3. The first transformer T1 comprises a first transformer secondary coil L1, a first transformer primary first coil L2 and a first transformer primary second coil L3. The second transformer comprises a second transformer secondary coil L1', a second transformer primary first coil L2' and a second transformer primary second coil L3'. The third transformer T3 comprises a third transformer secondary coil L1', a third transformer primary first coil L2', and a third transformer primary second coil L3'. The gate terminal of the first IGBT tube Q1 is connected to the first terminal A of the first transformer secondary coil L1, and the gate terminal of the second IGBT tube Q2 is connected to the second terminal B of the first transformer secondary coil L1 through a resistor R3. The collector of the first IGBT tube Q1 is connected with the first end C of the primary side first coil L2 of the first transformer, and the collector of the second IGBT tube Q2 is connected with the second end E of the primary side second coil L3 of the first transformer. The second end of the primary side first coil L2 of the first transformer is connected with the first end of the primary side second coil L3 of the first transformer to form a D end, and the D end is connected with the first end C 'of the primary side first coil L2' of the third transformer. The midpoint of the first transformer secondary coil L1 is connected to the first end a "of the third transformer secondary coil L1". The gate terminal of the third IGBT tube Q3 is connected to the first terminal a 'of the second transformer secondary winding L1', and the gate terminal of the fourth IGBT tube Q4 is connected to the second terminal B 'of the second transformer secondary winding L1' via a resistor R6. The collector of the third IGBT Q3 is connected to the first end C 'of the primary side first coil L2' of the second transformer, and the collector of the fourth IGBT Q4 is connected to the second end E 'of the primary side second coil L3' of the second transformer. The second end of the primary side first coil L2 'of the second transformer is connected with the first end of the primary side second coil L3' of the second transformer to form a D 'end, and the D' end is connected with the second end E 'of the primary side second coil L3' of the third transformer. The midpoint of the secondary winding L1' of the second transformer is connected with the second end B "of the secondary winding L1" of the third transformer through a resistor R7. The emitters of the first IGBT tube Q1, the second IGBT tube Q2, the third IGBT tube Q3 and the fourth IGBT tube Q4 are all grounded.
In the preferred embodiment shown in fig. 4, the parallel current sharing system of the switching device of the present invention further includes resistors R1, R2, R4 and R5, the resistor R1 is connected between the gate of the first IGBT Q1 and the control signal receiving terminal, the resistor R2 is connected between the gate of the second IGBT Q2 and the control signal receiving terminal, the resistor R4 is connected between the gate of the third IGBT Q3 and the control signal receiving terminal, and the resistor R5 is connected between the gate of the fourth IGBT Q4 and the control signal receiving terminal.
In the preferred embodiment shown in fig. 4, the switching device parallel current sharing system of the present invention further includes a load diode D1 and a load inductance L0 connected between the transformer current sharing module 200 and the power source VCC. The cathode of the load diode D1 is connected with the power supply VCC, the anode of the load diode D1 is connected with the end D', one end of the load inductor L0 is connected with the power supply VCC, and the other end of the load inductor L0 is connected with the end D ".
In the present embodiment, the manner of controlling the first IGBT tube Q1, the second IGBT tube Q2, the third IGBT tube Q3, and the fourth IGBT tube Q4 is similar to the embodiment shown in fig. 2. Based on the teachings of the embodiment shown in fig. 2, one skilled in the art can implement the embodiment shown in fig. 4, and will not be further described herein. In the embodiment shown in fig. 4, the turns ratio of the primary side first coil L2 of the first transformer to the primary side second coil L3 of the first transformer is 1:1; the turns ratio of the primary side first coil L2 'of the second transformer to the primary side second coil L3' of the second transformer is 1:1. The turns ratio of the primary side first coil L2 'of the third transformer to the primary side second coil L3' of the third transformer is 1:1.
In a further preferred embodiment of the present invention, the switching device parallel module 100 further includes a plurality of switching device groups connected in parallel with each other, and each switching device group includes at least two switching devices connected in parallel with each other. A person skilled in the art may construct a suitable transformer current sharing module 200 based on the embodiments shown in fig. 2-4. Those skilled in the art will be able to implement the above embodiments based on the teachings of the embodiments shown in fig. 2-3, and will not be further described herein.
By connecting the control ends of the parallel switching devices to the two ends of the secondary coil of the transformer, the parallel switching device current sharing system is forced to equalize the currents of the parallel switching devices. Further, the switching times of the switching devices are also forced to be synchronized.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A parallel current sharing system of switching devices, comprising: the switching device parallel module comprises at least two switching devices which are connected in parallel with each other, the transformer current sharing module comprises at least one transformer, first ends of the switching devices are all connected with the input end of the transformer current sharing module, control ends of the switching devices are all connected with the output end of the transformer current sharing module so as to control the currents flowing through the switching devices to be equal, and second ends of the switching devices are grounded; the parallel switch device module comprises a first switch device and a second switch device which are connected in parallel, the transformer current equalizing module comprises a first transformer, the first transformer comprises a first transformer secondary coil, a first transformer primary first coil and a first transformer primary second coil, the control end of the first switch device is connected to the first end of the first transformer secondary coil, the control end of the second switch device is connected to the second end of the first transformer secondary coil, the first end of the first switch device is connected to the first end of the first transformer primary first coil, the first end of the second switch device is connected to the second end of the first transformer primary second coil, the second end of the first transformer primary first coil is connected to the first end of the first transformer primary second coil, and the second ends of the first switch device and the second switch device are grounded.
2. The parallel current sharing system of claim 1, wherein the turns ratio of the first primary winding of the first transformer to the second primary winding of the first transformer is 1:1.
3. The switching device parallel current sharing system of claim 1, wherein the switching device parallel module further comprises a third switching device connected in parallel with the first switching device and the second switching device, the transformer current sharing module comprises a second transformer comprising a second transformer secondary winding, a second transformer primary first winding, and a second transformer primary second winding, a midpoint of the first transformer secondary winding is connected to a first end of the second transformer secondary winding, a control end of the third switching device is connected to a second end of the second transformer secondary winding, a first end of the third switching device is connected to a second end of the second transformer primary second winding, a first end of the second transformer primary second winding is connected to a second end of the second transformer primary first winding, a first end of the second transformer primary first winding is connected to a first end of the first transformer primary first winding and a second end of the second transformer primary winding is connected to a second end of the first transformer primary winding, and a third end of the third switching device is connected to the second end of the first winding.
4. The parallel current sharing system of claim 3, wherein the turns ratio of the first primary winding of the first transformer to the second primary winding of the first transformer is 1:1; the turns ratio of the primary side first coil of the second transformer to the primary side second coil of the second transformer is 1:2.
5. The switching device parallel current sharing system of claim 3, wherein the switching device parallel module further comprises a fourth-nth switching device in parallel with the first switching device and the second switching device, the transformer current sharing module comprising a third transformer-nth-1 transformer, wherein N is a positive integer greater than 4.
6. The switching device parallel current sharing system of claim 1, wherein the switching device parallel module further comprises a third switching device and a fourth switching device connected in parallel with each other, the transformer current sharing module comprises a second transformer and a third transformer, the third switching device and the fourth switching device connected in parallel with each other and the first switching device and the second switching device connected in parallel with each other, the second transformer comprises a second transformer secondary winding, a second transformer primary winding and a second transformer primary winding, the third transformer comprises a third transformer secondary winding, a third transformer primary winding and a third transformer primary winding, a control terminal of the third switching device is connected to a first terminal of the second transformer secondary winding, a control terminal of the fourth switching device is connected to a second terminal of the second transformer secondary winding, a first terminal of the third switching device is connected to a second terminal of the second transformer primary winding, a first terminal of the third switching device is connected to a first terminal of the second transformer primary winding, a second terminal of the fourth switching device is connected to a second terminal of the second transformer primary winding, a fourth switching device is connected to a second terminal of the fourth transformer primary winding, and a fourth terminal of the fourth switching device is connected to a second terminal of the second transformer primary winding; the midpoint of the secondary coil of the first transformer is connected with the first end of the secondary coil of the third transformer, the midpoint of the secondary coil of the second transformer is connected with the second end of the secondary coil of the third transformer, the second end of the primary coil of the first transformer and the first end of the primary coil of the first transformer are connected with the first end of the primary coil of the third transformer, the second end of the primary coil of the second transformer and the first end of the primary coil of the second transformer are connected with the second end of the primary coil of the third transformer, and the first end of the primary coil of the third transformer is connected with the second end of the primary coil of the third transformer.
7. The parallel current sharing system of claim 6, wherein the turns ratio of the first primary winding of the first transformer to the second primary winding of the first transformer is 1:1; the turns ratio of the primary side first coil of the second transformer to the primary side second coil of the second transformer is 1:1; the turns ratio of the primary side first coil of the third transformer to the primary side second coil of the third transformer is 1:1.
8. The parallel current sharing system of switching devices of claim 1, further comprising a load diode and a load inductor connected between the transformer current sharing module and a power supply, wherein a cathode of the load diode is connected to the power supply, an anode of the load diode is connected to a second end of the first primary transformer coil, one end of the load inductor is connected to the power supply, and the other end of the load inductor is connected to the second end of the first primary transformer coil.
9. The parallel current sharing system according to any one of claims 1-8, wherein the switching device comprises an IGBT tube and a MOSFET tube, and the transformer is a magnetic ring transformer.
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| CN207926432U (en) * | 2018-03-22 | 2018-09-28 | 维谛技术有限公司 | A kind of switching device parallel current-sharing system |
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| CN103199679A (en) * | 2013-04-18 | 2013-07-10 | 电子科技大学 | Equalized current output circuit of insulated gate bipolar transistor |
| CN203933364U (en) * | 2014-05-28 | 2014-11-05 | 天津瑞能电气有限公司 | A kind of high-power drive circuit in parallel of multiple IGBT modules |
| CN104201882A (en) * | 2014-08-20 | 2014-12-10 | 华为技术有限公司 | Non-isolated voltage-stabilization current-sharing circuit and power supply system |
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