Insulated gate bipolar transistor (IGBT) isolation driving power supply
By utilizing the difference in the number of turns in the transformer windings and the switching of the switching unit in the IGBT isolated drive power supply, the amplitude of the drive voltage is adjusted, solving the problem of the non-adjustable power of the existing IGBT drive power supply, and realizing the adaptation of multiple IGBT modules and cost reduction.
Patent Information
- Application Number
- CN202423236326.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Existing IGBT driver power supplies have non-adjustable power and cannot be adapted to the compatible design of various IGBTs, which leads to the need to increase the capacity and size of the driver transformer, thus increasing production costs.
Design an IGBT isolated drive power supply. By configuring different winding turns of the transformer and switching the switching unit, the voltage division of the rectifier unit is adjusted, the amplitude of the drive voltage is changed, and the power is regulated to adapt to IGBT modules of different specifications.
It enables adjustable output power of IGBT isolated drive power supply, reduces power supply cost, expands the scope of application, and eliminates the need to increase transformer capacity and size.
Smart Images
Figure CN223771950U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drive power supply technology, specifically to an IGBT isolated drive power supply. Background Technology
[0002] Existing IGBT drive power supplies can only provide a single positive and negative power supply. Given a fixed switching frequency f and IGBT gate charge Qg, the drive power P = f * Qg * (V1 - V2) is fixed.
[0003] In normal power electronic devices, IGBTs may be designed with compatible solutions from different manufacturers. The gate charge Qg of IGBTs varies, which means that a single drive power supply cannot be adapted to the compatible design of multiple IGBTs. This requires increasing the capacity and size of the drive transformer, increasing production costs and causing great inconvenience to production. Utility Model Content
[0004] In view of this, the present invention provides an IGBT isolated drive power supply to solve the problem of the non-adjustable power of existing IGBT drive power supplies.
[0005] This utility model provides an IGBT isolated drive power supply, including: a transformer, a rectifier unit, a first switching unit, and a second switching unit. The transformer includes a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding. The first primary winding and the second primary winding have the same number of turns, while the first secondary winding has a greater number of turns than the second secondary winding. A push-pull signal is input to the first end of the first primary winding and the first end of the second primary winding. The second ends of both the first and second primary windings are connected to an external power supply. The transformer is used to generate an induced voltage in the first and second secondary windings based on the push-pull signal. The rectifier unit... One end of the rectifier unit is connected to the first end of the first secondary winding and the first end of the first switching unit; the second end of the rectifier unit is connected to the second end of the first switching unit and the first end of the second switching unit; the third end of the rectifier unit is connected to the second end of the first secondary winding and the first end of the second secondary winding. The rectifier unit is used to output a positive or negative voltage based on the induced voltage. The second end of the second switching unit is connected to the second end of the second secondary winding. When the first switching unit is turned on and the second switching unit is turned off, the amplitudes of the positive and negative driving voltages are equal. When the first switching unit is turned off and the second switching unit is turned on, the amplitude of the positive driving voltage is greater than the amplitude of the negative driving voltage.
[0006] The IGBT isolated drive power supply provided by this utility model can change the connection relationship between the first secondary winding and the second secondary winding and the rectifier unit by switching the on and off states of the first switching unit and the second switching unit. This adjusts the voltage division in the rectifier unit, changes the amplitude of the driving negative voltage, and thus adjusts the output power of the IGBT isolated drive power supply. As a result, the IGBT isolated drive power supply can drive IGBT modules of various specifications without increasing the capacity and size of the transformer, reducing power supply costs and expanding the applicability.
[0007] In one alternative embodiment, the first switching unit includes: a first switch, wherein a first end of the first switch is connected to a first end of a first secondary winding, and a second end of the first switch is connected to a first end of a second switching unit.
[0008] In one optional embodiment, the second switching unit includes a second switch, wherein a first end of the second switch is connected to a second end of the first switching unit, and a second end of the second switch is connected to a second end of the second secondary winding.
[0009] In one alternative implementation, the first switch and the second switch are any one of a MOSFET, an IGBT, a relay, and a contactor.
[0010] In one optional embodiment, the rectifier unit includes a first diode, a second diode, a first capacitor, and a second capacitor, wherein the anode of the first diode is connected to the first end of the first secondary winding, the cathode of the first diode is connected to the first end of the first capacitor and outputs a positive driving voltage; the second end of the first capacitor is connected to the first end of the second capacitor and the second end of the first secondary winding and grounded; the anode of the second diode is connected to the second end of the second capacitor and outputs a negative driving voltage, and the cathode of the second diode is connected to the second end of the first switching unit.
[0011] In one optional embodiment, the IGBT isolated drive power supply further includes a push-pull circuit, wherein a first input terminal and a second input terminal of the push-pull circuit are respectively input to a first drive signal and a second drive signal, and a first output terminal and a second output terminal of the push-pull circuit are respectively connected to the first end of the first primary winding and the first end of the second primary winding, and the push-pull circuit is used to switch the on / off state based on the first drive signal and the second drive signal and output a push-pull signal.
[0012] In one optional embodiment, the push-pull circuit includes a third switch and a fourth switch, wherein the control terminal of the third switch receives a first drive signal, the first terminal of the third switch is connected to the first terminal of the first primary winding, the second terminal of the third switch is connected to the first terminal of the fourth switch and grounded; the control terminal of the fourth switch receives a second drive signal, and the second terminal of the fourth switch is connected to the first terminal of the second primary winding.
[0013] In one alternative implementation, both the third and fourth switches are NMOS.
[0014] In one alternative implementation, the first drive signal and the second drive signal have the same duty cycle.
[0015] In one optional embodiment, the IGBT isolated drive power supply further includes a control unit, wherein the input terminal of the control unit receives a control signal, and the first output terminal and the second output terminal of the control unit are respectively connected to the control terminal of the first switching unit and the control terminal of the second switching unit. The control unit is used to control the control terminal of the first switching unit and the second switching unit to switch on / off states based on the control signal.
[0016] The IGBT isolated drive power supply provided by this utility model has a control unit that can automatically control the switching states of the first switching unit and the second switching unit according to the control signal, thereby improving the automation of the IGBT isolated drive unit. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a component diagram of an IGBT isolated drive power supply according to an embodiment of the present utility model;
[0019] Figure 2 This is a specific circuit structure diagram of an IGBT isolated drive power supply according to an embodiment of the present utility model;
[0020] Figure 3 This is another component diagram of the IGBT isolated drive power supply according to an embodiment of the present utility model. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0024] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0025] This embodiment provides an IGBT isolated drive power supply, such as Figure 1 As shown, it includes: transformer 1, rectifier unit 2, first switch unit 3 and second switch unit 4.
[0026] Figure 1 In the transformer 1, there are a first primary winding N1, a second primary winding N2, a first secondary winding N3 and a second secondary winding N4. The first primary winding N1 and the second primary winding N2 have the same number of turns, and the first secondary winding N3 has a greater number of turns than the second secondary winding N4. Push-pull signals are input to the first end of the first primary winding N1 and the first end of the second primary winding N2. The second ends of the first primary winding N1 and the second primary winding N2 are both connected to an external power supply.
[0027] Figure 1 In the rectifier unit 2, the first end is connected to the first end of the first secondary winding N3 and the first end of the first switching unit 3, the second end of the rectifier unit 2 is connected to the second end of the first switching unit 3 and the first end of the second switching unit 4, the third end of the rectifier unit 2 is connected to the second end of the first secondary winding N3 and the first end of the second secondary winding N4, and the second end of the second switching unit 4 is connected to the second end of the second secondary winding N4.
[0028] Specifically, Figure 1 In this circuit, transformer 1 generates induced voltages in the first secondary winding N3 and the second secondary winding N4 based on a push-pull signal. Rectifier unit 2 is used to output a positive driving voltage V1 or a negative driving voltage V2 based on the induced voltage. An external power supply outputs the primary input voltage VCC. By switching the on / off states of the first switching unit 3 and the second switching unit 4, the turns ratio of the primary and secondary sides of the transformer is adjusted. The relationship between the driving positive voltage V1 and the primary input voltage VCC is V1:VCC = N3:N1. When the first switch unit 3 is turned on and the second switch unit 4 is turned off, there is no induced voltage in the second secondary winding N4, so the circuit is disconnected and does not work. The relationship between the driving negative voltage V2 and the primary input voltage VCC is V2:VCC=N3:N1, that is, the amplitudes of the driving positive voltage V1 and the driving negative voltage V2 are equal. When the first switch unit 3 is turned off and the second switch unit 4 is turned on, the relationship between the driving negative voltage V2 and the primary input voltage VCC is V2:VCC=N4:N1. Since the number of turns in the first secondary winding N3 is greater than the number of turns in the second secondary winding N4, the amplitude of the driving negative voltage V2 is lower than the amplitude of the driving positive voltage V1.
[0029] Specifically, Figure 1 In the IGBT isolated drive power supply, the output power P = f * Qg * (V1 - V2), where f is the switching frequency of the IGBT and Qg is the gate charge of the IGBT. Different IGBTs have different gate charges.
[0030] For example, Figure 1 In the process, when driving an IGBT with gate charge Qg1 and an IGBT with gate charge Qg2 respectively, and Qg1 is less than Qg2, when the IGBT isolation drive power supply drives the IGBT with gate charge Qg1, the first switching unit 3 is turned on and the second switching unit 4 is turned off. At this time, the output power of the IGBT isolation drive power supply is P1 = f * Qg1 * (V1 - V2). When the IGBT isolation drive power supply drives the IGBT with gate charge Qg2, the first switching unit 3 is turned off and the second switching unit 4 is turned on. At this time, the output power of the IGBT isolation drive power supply is P2 = f * Qg2 * (V1 - V2). Since the amplitude of V2 decreases, the output power of the IGBT isolation drive power supply is less than the output power when driving the IGBT with gate charge Qg1. That is, by switching the on and off states of the first switching unit 3 and the second switching unit 4, P2 is made less than P1.
[0031] It should be noted that the number of primary windings and secondary windings of a transformer can be flexibly set according to actual needs, and there are no restrictions here.
[0032] The IGBT isolated drive power supply provided by this utility model can change the connection relationship between the first and second secondary windings and the rectifier unit by switching the on / off states of the first and second switching units. This adjusts the voltage division within the rectifier unit, changes the amplitude of the driving negative voltage, and thus adjusts the output power of the IGBT isolated drive power supply. When the IGBT gate charge is low, switching the on / off states of the first and second switching units increases the output power of the IGBT isolated drive power supply; when the IGBT gate charge is high, switching the on / off states of the first and second switching units decreases the output power of the IGBT isolated drive power supply. This allows the IGBT isolated drive power supply to drive IGBT modules of various specifications without increasing the capacity and size of the transformer, reducing power supply costs and expanding its applicability.
[0033] In one alternative implementation, such as Figure 2 As shown, the first switching unit 3 includes: a first switch K1, wherein the first end of the first switch is connected to the first end of the first secondary winding, and the second end of the first switch is connected to the first end of the second switching unit; the second switching unit 4 includes: a second switch K2, wherein the first end of the second switch is connected to the second end of the first switching unit, and the second end of the second switch is connected to the second end of the second secondary winding.
[0034] Specifically, Figure 2 When the first switch K1 is on and the second switch K2 is off, the relationship between the positive driving voltage V1 and the primary input voltage VCC is V1:VCC = N3:N1, and the relationship between the negative driving voltage V2 and the primary input voltage VCC is V2:VCC = N3:N1, meaning that the amplitudes of the positive driving voltage V1 and the negative driving voltage V2 are equal. When the first switch K1 is off and the second switch K2 is on, the amplitude of the positive driving voltage V1 remains unchanged, and the relationship between the negative driving voltage V2 and the primary input voltage VCC is V2:VCC = N4:N1. Since the number of turns of the first secondary winding N3 is greater than the number of turns of the second secondary winding N4, the amplitude of the positive driving voltage V1 is greater than the amplitude of the negative driving voltage V2 at this time.
[0035] Optionally, the first switch K1 and the second switch K2 can be selected from MOSFETs, IGBTs, relays, contactors, etc.
[0036] Specifically, Figure 2In the rectifier unit 2, there are a first diode D1, a second diode D2, a first capacitor C1, and a second capacitor C2. The anode of the first diode D1 is connected to the first terminal of the first secondary winding N3, and the cathode of the first diode D1 is connected to the first terminal of the first capacitor C1 and outputs a positive driving voltage V1. The second terminal of the first capacitor C1 is connected to the first terminal of the second capacitor C2 and the second terminal of the first secondary winding N3 and grounded. The anode of the second diode D2 is connected to the second terminal of the second capacitor C2 and outputs a negative driving voltage V2. The cathode of the second diode D2 is connected to the second terminal of the first switching unit 3.
[0037] In one alternative implementation, such as Figure 2 As shown, the IGBT isolated drive power supply also includes a push-pull circuit 5, wherein the first input terminal and the second input terminal of the push-pull circuit 5 are respectively input to the first drive signal and the second drive signal, and the first output terminal and the second output terminal of the push-pull circuit 5 are respectively connected to the first terminal of the first primary winding N1 and the first terminal of the second primary winding N2. The push-pull circuit 5 is used to switch the on / off state based on the first drive signal and the second drive signal and output the push-pull signal.
[0038] Specifically, Figure 2 In the push-pull circuit 5, there are: a third switch Q1 and a fourth switch Q2. The control terminal of the third switch Q1 receives a first drive signal PWM1. The first terminal of the third switch Q1 is connected to the first terminal of the first primary winding N1. The second terminal of the third switch Q1 is connected to the first terminal of the fourth switch Q2 and connected to the primary ground GND1. The control terminal of the fourth switch Q2 receives a second drive signal PWM2. The second terminal of the fourth switch Q2 is connected to the first terminal of the second primary winding N2.
[0039] Specifically, the duty cycles of the first drive signal PWM1 and the second drive signal PWM2 are the same. When PWM1 is high, the third switch Q1 is turned on, and VCC flows through the first primary winding N1 and the third switch Q1 to the primary ground GND1, thereby inducing a voltage in the secondary winding of transformer 1 and outputting a positive driving voltage V1 through the rectifier unit 2. When PWM2 is high, the fourth switch Q2 is turned on, and the power supply VCC flows through the second primary winding N2 and the fourth switch Q2 to the primary ground GND1, thereby inducing a voltage in the secondary winding of transformer 1 and outputting a negative driving voltage V2 through the rectifier unit 2.
[0040] Optionally, both the third switch Q1 and the fourth switch Q2 are NMOS.
[0041] In one alternative implementation, such as Figure 3As shown, the IGBT isolated drive power supply also includes: a control unit 6, wherein the input terminal of the control unit 6 receives a control signal, and the first output terminal and the second output terminal of the control unit 6 are respectively connected to the control terminal of the first switching unit 3 and the control terminal of the second switching unit 4. The control unit 6 is used to control the control terminal of the first switching unit 3 and the second switching unit 4 to switch on and off states based on the control signal.
[0042] Optionally, the operator can input the switching signal as a control signal into the control unit 6 based on the gate charge of the IGBT, so that the first switching unit 3 and the second switching unit 4 can automatically switch between on and off states under the control of the control unit 6. The operator can also input a preset gate charge into the control unit 6, and the control unit 6 can automatically control the first switching unit 3 and the second switching unit 4 to switch between on and off states by comparing the gate charge of the IGBT connected to the IGBT isolated drive power supply with the preset gate charge.
[0043] In this embodiment, the control unit integrates existing mature switching control software. Those skilled in the art can program the control unit according to the mature switching control program in the prior art and combine it with actual needs to adjust the switching unit's on and off logic. That is, this embodiment only protects the connection relationship of the control unit and the structure of the IGBT isolated drive power supply, and does not protect the specific control method of the switching unit in the control unit.
[0044] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. An isolated drive power supply for an IGBT, characterized by, The transformer, the rectifier unit, the first switch unit and the second switch unit comprise: The transformer comprises a first primary winding, a second primary winding, a first secondary winding and a second secondary winding, the number of turns of the first primary winding is the same as that of the second primary winding, and the number of turns of the first secondary winding is greater than that of the second secondary winding; a first end of the first primary winding and a first end of the second primary winding input a push-pull signal, a second end of the first primary winding and a second end of the second primary winding are connected with an external power supply, and the transformer is used for generating induced voltages in the first secondary winding and the second secondary winding based on the push-pull signal; The first end of the rectifier unit is connected with the first end of the first secondary winding and the first end of the first switch unit, the second end of the rectifier unit is connected with the second end of the first switch unit and the first end of the second switch unit, the third end of the rectifier unit is connected with the second end of the first secondary winding and the first end of the second secondary winding, and the rectifier unit is used for outputting a driving positive voltage or a driving negative voltage based on the induced voltages; The second end of the second switch unit is connected with the second end of the second secondary winding; When the first switch unit is turned on and the second switch unit is turned off, the amplitudes of the driving positive voltage and the driving negative voltage are equal; When the first switch unit is turned off and the second switch unit is turned on, the amplitude of the driving positive voltage is greater than that of the driving negative voltage. The first switch unit comprises a first switch, wherein 2. The isolated IGBT driver power supply of claim 1, wherein, The first end of the first switch is connected with the first end of the first secondary winding, and the second end of the first switch is connected with the first end of the second switch unit. The second switch unit comprises a second switch, wherein 3. The isolated IGBT driver power supply of claim 2, wherein, The first end of the second switch is connected with the second end of the first switch unit, and the second end of the second switch is connected with the second end of the second secondary winding.
4. The IGBT isolation driving power supply according to claim 3, wherein The first switch and the second switch are any one of MOSFET, IGBT, relay and contactor. The rectifier unit comprises a first diode, a second diode, a first capacitor and a second capacitor, wherein 5. The isolated IGBT driver power supply of claim 1, wherein, The anode of the first diode is connected with the first end of the first secondary winding, the cathode of the first diode is connected with the first end of the first capacitor and outputs the driving positive voltage; The second end of the first capacitor is connected with the first end of the second capacitor and the second end of the first secondary winding and grounded; The anode of the second diode is connected with the second end of the second capacitor and outputs the driving negative voltage, and the cathode of the second diode is connected with the second end of the first switch unit. Further comprising:
6. The isolated IGBT driver power supply of claim 1, wherein, A push-pull circuit, wherein The first end of the first switch unit is connected with the first end of the first secondary winding, the second end of the first switch unit is connected with the first end of the second switch unit, and the third end of the first switch unit is connected with the second end of the first secondary winding and the first end of the second secondary winding. The first input end and the second input end of the push-pull circuit input a first drive signal and a second drive signal respectively, the first output end and the second output end of the push-pull circuit are connected with the first end of the first primary winding and the first end of the second primary winding respectively, and the push-pull circuit is used for switching on and off states based on the first drive signal and the second drive signal and outputting the push-pull signal.
7. The isolated IGBT driver power supply of claim 6, wherein, The push-pull circuit comprises a third switch and a fourth switch, wherein, The control end of the third switch receives the first drive signal, the first end of the third switch is connected with the first end of the first primary winding, and the second end of the third switch is connected with the first end of the fourth switch and grounded; The control end of the fourth switch receives the second drive signal, and the second end of the fourth switch is connected with the first end of the second primary winding.
8. The IGBT isolated drive power supply according to claim 7, characterized in that, The third switch and the fourth switch are both NMOS.
9. The isolated IGBT driver power supply of claim 7, wherein, The duty cycle of the first drive signal is the same as that of the second drive signal.
10. The isolated IGBT driver power supply of claim 7, wherein, Further comprising: A control unit, wherein, The input end of the control unit inputs a control signal, the first output end and the second output end of the control unit are connected with the control end of the first switch unit and the control end of the second switch unit respectively, and the control unit is used for controlling the control end of the first switch unit and the second switch unit to switch on and off states based on the control signal.