Driving circuit of power tube and electronic equipment

Abstract

The utility model relates to the technical field of electronic power, and discloses a driving circuit of a power tube and electronic equipment, the driving circuit comprises a driving signal output circuit, a switch control circuit and a driving control circuit; the driving signal output circuit is used for outputting a driving signal when receiving the wave sending signal; the switch control circuit is connected with the driving signal output circuit, and the switch control circuit is used for outputting a switch control signal when receiving the driving signal; the drive control circuit is connected with the switch control circuit and the power tube, and the switch control circuit is used for controlling the power tube to be switched on or switched off when receiving the switch control signal. The on-off delay and the on-off speed of the power tube can be flexibly adjusted only by adjusting the circuit parameters of the on-off control circuit, the driving consistency is high in multiple high-power complete machine parallel operation occasions, the power tube driving circuit can be used in parallel with different driving chips, and the flexibility is greatly improved.

Description

Technical Field

[0001] The present application relates to the field of electronic power technology, and in particular to a driving circuit of a power tube and an electronic device. Background Art

[0002] With the rapid development of industrial technology, the demand for high-power inverters, grid-connected inverters and energy storage converters is growing. IGBT (Insulate-Gate Bipolar Transistor) is the core component of the above devices, and high-performance IGBT drive circuits will improve the overall performance and reliability of the equipment.

[0003] Currently, the commonly used IGBT drive circuit is composed of an IGBT drive chip plus a push-pull circuit. However, when multiple complete machines are running in parallel, the IGBT drive circuit relies on the delay of the drive chip and the IGBT itself. It is difficult to flexibly adjust the turn-on and turn-off delays of the IGBT. There are problems such as low drive consistency and poor parallel current sharing. In addition, it cannot be used in parallel with different drive chips. Utility Model Content

[0004] The main purpose of the present application is to propose a driving circuit and electronic device for a power tube, aiming to solve the problems of low driving consistency and poor parallel current sharing of existing driving circuits in parallel driving scenarios.

[0005] To achieve the above object, the present application provides a driving circuit for a power tube, the driving circuit comprising:

[0006] A driving signal output circuit, wherein the driving signal output circuit is used to output a driving signal when receiving a wave transmission signal;

[0007] a switch control circuit, the switch control circuit being connected to the drive signal output circuit, and the switch control circuit being configured to output a switch control signal when receiving the drive signal;

[0008] A drive control circuit, wherein the drive control circuit is connected to the switch control circuit and the power tube respectively, and the switch control circuit is used to control the power tube to be turned on or off when receiving the switch control signal.

[0009] Optionally, the switch control circuit includes a first switch control circuit, the drive signal includes a first drive signal, and the switch control signal includes a first switch control signal;

[0010] The first switch control circuit is used to output the first switch control signal to the drive control circuit when receiving the first drive signal, so that the drive control circuit controls the power tube to turn on.

[0011] Optionally, the first switch control circuit includes a second chip, a second resistor, a third resistor, a first diode and a fourth capacitor;

[0012] The first end of the second resistor and the first end of the third resistor are respectively connected to the drive signal output circuit, the second end of the second resistor is connected to the second end of the first diode, the second end of the third resistor, the first end of the first diode and the first end of the fourth capacitor are respectively connected to the second pin of the second chip, the second end of the fourth capacitor is connected to the reference ground, and the fifth pin of the second chip is connected to the drive control circuit.

[0013] Optionally, the first switch control circuit further includes:

[0014] a second diode, wherein the second end of the second diode is connected to the second pin of the second chip, and the first end of the second diode is connected to the reference ground terminal; and / or,

[0015] A sixth resistor, wherein a first end of the sixth resistor is connected to the fifth pin of the second chip, and a second end of the sixth resistor is connected to the drive control circuit.

[0016] Optionally, the switch control circuit further includes a second switch control circuit, the drive signal further includes a second drive signal, and the switch control signal includes a second switch control signal;

[0017] The second switch control circuit is used to output the second switch control signal to the drive control circuit when receiving the second drive signal, so that the drive control circuit controls the power tube to be turned off.

[0018] Optionally, the second switch control circuit includes a third chip, a fourth resistor, and a fifth resistor;

[0019] The first end of the fourth resistor and the first end of the fifth resistor are respectively connected to the drive signal output circuit, the second end of the fifth resistor is connected to the second pin of the third chip, the second end of the fourth resistor is connected to the reference ground, and the fifth pin of the third chip is connected to the drive control circuit.

[0020] Optionally, the second switch control circuit further includes a seventh resistor, a first end of the seventh resistor is connected to the fifth pin of the third chip, and a second end of the seventh resistor is connected to the drive control circuit.

[0021] Optionally, the drive control circuit includes a first switch tube, a second switch tube, an eighth resistor and a ninth resistor;

[0022] The controlled end of the first switch tube is connected to the first switch control circuit, the first end of the first switch tube is connected to the positive electrode of the first power supply, the second end of the first switch tube is connected to the first end of the eighth resistor, and the second end of the eighth resistor is connected to the controlled end of the power tube;

[0023] The controlled end of the second switch tube is connected to the second switch control circuit, the second end of the second switch tube is connected to the negative electrode of the first power supply, the first end of the second switch tube is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the controlled end of the power tube.

[0024] Optionally, the driving circuit further includes a reset circuit;

[0025] The reset circuit is connected to the drive signal output circuit, and is used to output a reset signal to the drive signal output circuit when receiving a fault signal output by the drive signal output circuit.

[0026] Optionally, the reset circuit includes a fourth chip, a fourth switch tube, a fifth switch tube, a third diode, a sixth capacitor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor;

[0027] The controlled end of the fourth switch tube is respectively connected to the first end of the third diode and the second end of the tenth resistor, the second end of the third diode is connected to the fault signal output end of the drive signal output circuit, the first end of the fourth switch tube is respectively connected to the first pin of the fourth chip and the second end of the eleventh resistor, the first end of the sixth capacitor is respectively connected to the third pin of the fourth chip, the fourth pin of the fourth chip, the second end of the twelfth resistor and the second end of the thirteenth resistor, the first end of the thirteenth resistor is connected to the second pin of the fourth chip, the controlled end of the fifth switch tube is connected to the second end of the fourteenth resistor, the first end of the fourteenth resistor is connected to the eighth pin of the fourth chip, the first end of the fifth switch tube is respectively connected to the second end of the fifteenth resistor and the reset signal input end of the drive signal output circuit, the first end of the tenth resistor, the first end of the eleventh resistor, the first end of the twelfth resistor and the first end of the fifteenth resistor are respectively connected to the second power supply, and the second end of the fourth switch tube, the second end of the fifth switch tube and the second end of the sixth capacitor are respectively grounded.

[0028] In addition, to achieve the above-mentioned purpose, the present application also provides an electronic device, which includes the driving circuit of the power tube as described above.

[0029] The present application provides a driving circuit for a power tube, the driving circuit comprising a driving signal output circuit, a switch control circuit and a driving control circuit connected in sequence, the driving signal output circuit is used to output a driving signal to the switch control circuit when receiving a wave signal, the switch control circuit is used to output a switch control signal to the driving control circuit when receiving the driving signal, and the driving control circuit is used to control the power tube to be turned on or off when receiving the switch control signal. The present application receives the driving signal output by the driving signal output circuit through the switch control circuit, and outputs the switch control signal to the driving control circuit, so that the driving control circuit controls the power tube to be turned on or off according to the received switch control signal. Compared with the existing IGBT driving circuit composed of an IGBT driving chip and a push-pull circuit, the present application can flexibly adjust the on-off delay and on-off speed of the power tube by adjusting the circuit parameters of the switch control circuit, thereby making it possible to achieve extremely high driving consistency in the case of multiple high-power complete machines running in parallel, while improving the control accuracy of the parallel current sharing, enhancing the stability of the parallel machine, and can also be used in parallel with different driving chips, greatly improving flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the framework structure of a driving circuit in one embodiment of the present application;

[0031] Figure 2 A schematic diagram of the structure of a switch control circuit and a drive control circuit of a drive circuit in one embodiment of the present application;

[0032] Figure 3 This is a schematic diagram of the structure of a driving signal output circuit of a driving circuit in one embodiment of the present application;

[0033] Figure 4 This is a schematic diagram of the framework structure of a driving circuit in another embodiment of the present application;

[0034] Figure 5 for Figure 4 A schematic diagram of the structure of a reset circuit of the driving circuit shown;

[0035] Figure 6 This is a schematic diagram of the framework structure of a driving circuit in yet another embodiment of the present application;

[0036] Figure 7 for Figure 6 Schematic diagram of the structure of the power supply circuit of the driving circuit shown.

[0037] Description of Figure Numbers:

[0038] Label name Label name 100 Drive circuit 10 Drive signal output circuit 20 Switch control circuit 30 Drive control circuit 40 Reset Circuit 50 Power Circuit 21 First switch control circuit 22 Second switch control circuit

[0039] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0040] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0043] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0045] With the rapid development of industrial technology, the demand for high-power inverters, grid-connected inverters and energy storage converters is growing. IGBT is the core component of the above equipment, and high-performance IGBT drive circuits will improve the overall performance and reliability of the equipment.

[0046] Currently, the commonly used IGBT drive circuit is composed of an IGBT drive chip plus a push-pull circuit. However, when multiple complete machines are running in parallel, the IGBT drive circuit relies on the delay of the drive chip and the IGBT itself. It is difficult to flexibly adjust the turn-on and turn-off delays of the IGBT. There are problems such as low drive consistency and poor parallel current sharing. In addition, it cannot be used in parallel with different drive chips.

[0047] Based on this, the present application provides a driving circuit of a power tube. In one embodiment of the present application, referring to Figure 1 As shown, the driving circuit includes a driving signal output circuit 10, a switch control circuit 20, and a driving control circuit 30;

[0048] The driving signal output circuit 10 is used to output a driving signal when receiving a wave signal;

[0049] The switch control circuit 20 is connected to the drive signal output circuit 10, and the switch control circuit 20 is used to output a switch control signal when receiving the drive signal;

[0050] The drive control circuit 30 is connected to the switch control circuit 20 and the power tube respectively. The switch control circuit 30 is used to control the power tube to turn on or off when receiving a switch control signal.

[0051] In this embodiment, the drive signal output circuit 10 can be connected to an external controller, and the controller sends a wave signal to the drive signal output circuit 10. The drive signal output circuit 10 sends a drive signal to the switch control circuit 20 according to the received wave signal. The switch control circuit 20 then sends a switch control signal to the drive control circuit 30 according to the received drive signal. The drive control circuit 30 can control the power tube to be turned on or off according to the switch control signal. It should be noted that the power tube refers to a device such as a triode, a MOS tube, an IGBT, etc. for realizing a switch function. In this embodiment, the power tube is an IGBT, that is, the third switch tube Q3. Compared with the existing IGBT drive chip plus a push-pull circuit to form an IGBT drive circuit, the present application can flexibly adjust the on-off delay of the power tube by adjusting the circuit parameters of the switch control circuit 20, so that in the case of multiple high-power complete machines running in parallel, its drive consistency is high, and at the same time, the control accuracy of the parallel current sharing is improved, and the stability of the parallel machine is enhanced. It can also be used in parallel with different drive chips, and the flexibility is greatly improved.

[0052] In one embodiment, reference Figure 2 , the switch control circuit 20 includes a first switch control circuit 21, the drive signal includes a first drive signal, and the switch control signal includes a first switch control signal;

[0053] The first switch control circuit 21 is used to output the first switch control signal to the drive control circuit 30 when receiving the first drive signal, so that the drive control circuit 30 controls the power tube to be turned on.

[0054] In this embodiment, the first switch control circuit 21 can be used to output the first switch control signal to the drive control circuit 30 when receiving the first drive signal, so as to instruct the drive control circuit 30 to control the power tube to turn on, and output the shutdown signal to the drive control circuit 30 when not receiving the first drive signal, and the drive control circuit 30 can control the power tube to remain in the shutdown state when receiving the shutdown signal. Compared with the existing IGBT drive circuit, the present application can flexibly adjust the on-off delay of the power tube by adjusting the circuit parameters of the first switch control circuit 21, thereby achieving high drive consistency in high-power parallel operation.

[0055] Optionally, in some feasible embodiments, reference Figure 2 , the first switch control circuit 21 includes a second chip U2, a second resistor R2, a third resistor R3, a first diode D1 and a fourth capacitor C4;

[0056] The first end of the second resistor R2 and the first end of the third resistor R3 are respectively connected to the drive signal output circuit 10, the second end of the second resistor R2 is connected to the second end of the first diode D1, the second end of the third resistor R3, the first end of the first diode D1 and the first end of the fourth capacitor C4 are respectively connected to the second pin of the second chip U2, the second end of the fourth capacitor C4 is connected to the reference ground, and the fifth pin of the second chip U2 is connected to the drive control circuit 30.

[0057] In this embodiment, the first drive signal is a positive voltage signal. Since the first drive signal output by the drive signal output circuit 10 needs to charge the fourth capacitor C4, the voltage signal received by the second pin of the second chip U2 is insufficient to enable the second chip U2 to output the first switch control signal. After the fourth capacitor C4 is charged to the preset voltage threshold, the voltage signal of the second pin of the second chip U2 can enable the second chip U2 to output the first switch control signal, so that the drive control circuit 30 controls the power tube to turn on after receiving the first switch control signal, thereby delaying the turning on of the power tube. It should be noted that the first switch control signal refers to a control signal that can drive the drive control circuit 30 to control the power tube to turn on. When the drive signal output circuit 10 stops outputting the first drive signal, the fourth capacitor C4 starts to discharge through the second resistor R2 and the third resistor R3, and provides a voltage signal for the second pin of the second chip U2, so that the second chip U2 can continue to output the first switch control signal. After the fourth capacitor C4 discharges for a period of time, the voltage signal of the second pin of the second chip U2 is not enough to maintain the second chip U2 to continue to output the first switch control signal. At this time, the second chip U2 stops outputting the first switch control signal or starts to output the shutdown signal, and the drive control circuit 30 controls the power tube to shut down based on this. In this embodiment, the delay of the drive control circuit 30 controlling the power tube to turn on is mainly determined by the third resistor R3, and the third resistor R3 is much larger than the second resistor R2. The delay of the drive control circuit 30 controlling the power tube to shut down is mainly determined by the second resistor R2, thereby realizing the decoupling of the power tube turn-on delay and the turn-off delay. It should be noted that the second chip U2 uses an inverter chip, which can invert the voltage signal input to the second pin of the second chip U2 to form the first switch control signal. The turn-on delay and turn-off delay of the existing driving circuit are mainly determined by the internal circuit of the driving chip and the power tube itself, resulting in the inability to decouple the turn-on delay and the turn-off delay, and the limited adjustment capability, which will cause the driving control circuit 30 to be directly turned on, causing the driving power supply to overload and the power tube to be mistakenly turned on. The present application can achieve the decoupling of the turn-on delay and the turn-off delay through the first switch control circuit 21, and can adjust the resistance values ​​of the third resistor R3 and the second resistor R2 respectively to adjust the delay time, thereby improving the adjustment capability, which is conducive to the application in the parallel operation of multiple high-power complete machines, and has high driving consistency and high control accuracy of parallel current sharing. At the same time, it can flexibly replace different driving chips to achieve the same driving effect.

[0058] Optionally, in some feasible embodiments, reference Figure 2 , the first switch control circuit 21 further includes:

[0059] A second diode D2, a second end of the second diode D2 is connected to the second pin of the second chip U2, and a first end of the second diode D2 is connected to the reference ground terminal; and / or,

[0060] A sixth resistor R6 , wherein a first end of the sixth resistor R6 is connected to the fifth pin of the second chip U2 , and a second end of the sixth resistor R6 is connected to the driving control circuit 30 .

[0061] In this embodiment, the input voltage of the second pin of the second chip U2 can be clamped at a voltage threshold by the second diode D2, thereby avoiding damage to the second chip U2. In addition, the sixth resistor R6 between the second chip U2 and the drive control circuit 30 can be adjusted to change the turn-on speed of the power tube controlled by the drive control circuit 30, so that the entire first switch control circuit can adjust the turn-on delay and the turn-off delay, and control the turn-on speed of the power tube, which is very beneficial for application in the occasion of parallel operation of multiple high-power complete machines.

[0062] In one embodiment, reference Figure 2 , the switch control circuit 20 further includes a second switch control circuit 22, the drive signal further includes a second drive signal, and the switch control signal includes a second switch control signal;

[0063] The second switch control circuit 22 is used for outputting a second switch control signal to the drive control circuit 30 when receiving the second drive signal, so that the drive control circuit 30 controls the power tube to be turned off.

[0064] In this embodiment, the second switch control circuit 22 can be used to output a second switch control signal to the drive control circuit 30 when receiving the second drive signal, so as to instruct the drive control circuit 30 to control the power tube to be turned off. The present application sets the first switch control circuit 21 so that the drive control circuit 30 drives the power tube to be turned on, and sets the second switch control circuit 22 so that the drive control circuit 30 drives the power tube to be turned off, so as to realize the alternating turning on and off of the power tube, thereby improving the efficiency of turning on and off the power tube, and improving the accuracy and reliability of the control of the power tube.

[0065] Optionally, in some feasible embodiments, reference Figure 2 , the second switch control circuit 22 includes a third chip U3, a fourth resistor R4, and a fifth resistor R5;

[0066] The first end of the fourth resistor R4 and the first end of the fifth resistor R5 are respectively connected to the drive signal output circuit 10, the second end of the fifth resistor R5 is connected to the second pin of the third chip U3, the second end of the fourth resistor R4 is connected to the reference ground, and the fifth pin of the third chip U3 is connected to the drive control circuit 30.

[0067] In this embodiment, when the drive signal output circuit 10 stops outputting the first drive signal, the drive signal output circuit 10 starts to output the second drive signal, and the second drive signal is a negative voltage signal. The voltage signal of the second pin of the third chip U3 is discharged through the fifth resistor R5. At this time, the voltage signal of the second pin of the third chip U3 is not enough to make the third chip U3 output the second switch control signal. After discharging to the chip threshold voltage of the third chip U3, the voltage signal of the second pin of the third chip U3 can make the third chip U3 output the second switch control signal, so that the drive control circuit 30 controls the power tube to turn off after receiving the second switch control signal, thereby forming a delay in the shutdown of the power tube. It should be noted that the second switch control signal refers to a control signal that can drive the drive control circuit 30 to control the power tube to turn off. In this embodiment, the delay of the drive control circuit 30 controlling the power tube to turn off is determined by the fifth resistor R5. It should be noted that the third chip U3 uses an inverter chip to invert the voltage signal of the second pin of the third chip U3 to form a second switch control signal.

[0068] Optionally, in some feasible embodiments, reference Figure 2 The second switch control circuit 22 further includes a seventh resistor R7 , a first end of the seventh resistor R7 is connected to the fifth pin of the third chip U3 , and a second end of the seventh resistor R7 is connected to the drive control circuit 30 .

[0069] In this embodiment, the seventh resistor R7 between the third chip U3 and the drive control circuit 30 can be adjusted to change the turn-on speed of the power tube controlled by the drive control circuit 30, so that the entire second switch control circuit 22 can not only adjust the turn-off delay of the power tube, but also control the turn-on speed of the power tube, which is very beneficial for application in high-power parallel operation.

[0070] Optionally, in some feasible embodiments, reference Figure 2 , the driving control circuit 30 includes a first switch tube Q1, a second switch tube Q2, an eighth resistor R8 and a ninth resistor R9;

[0071] The controlled end of the first switch tube Q1 is connected to the first switch control circuit 21, the first end of the first switch tube Q1 is connected to the positive electrode of the first power supply, the second end of the first switch tube Q1 is connected to the first end of the eighth resistor R8, and the second end of the eighth resistor R8 is connected to the controlled end of the power tube;

[0072] The controlled end of the second switch tube Q2 is connected to the second switch control circuit 21, the second end of the second switch tube Q2 is connected to the negative electrode of the first power supply, the first end of the second switch tube Q2 is connected to the first end of the ninth resistor R9, and the second end of the ninth resistor R9 is connected to the controlled end of the power tube.

[0073] In this embodiment, the first switch tube Q1 is turned on when receiving the first switch control signal output by the first switch control circuit 21, at which time the positive voltage H_VCC of the first power supply is connected to the controlled end of the power tube through the eighth resistor R8, and the controlled end of the power tube is at a high level, so the power tube is turned on. The second switch tube Q2 is turned on when receiving the second switch control signal output by the second switch control circuit 22, at which time the negative voltage H_VEE of the first power supply is connected to the controlled end of the power tube through the ninth resistor R9, and the controlled end of the power tube is at a low level, so the power tube is turned off. It should be noted that the first switch tube Q1 can be a P-channel MOS tube, then the first switch control signal formed by inverting the voltage signal of the second pin of the input second chip U2 is the reference ground voltage H_E, and the first switch tube Q1 is turned on; the second switch tube Q2 can be an N-channel MOS tube, then the second switch control signal formed by inverting the voltage signal of the second pin of the input third chip U3 is also the reference ground voltage H_E, and the second end of the second switch tube Q2 is connected to the negative voltage H_VEE of the first power supply, and the voltage difference between the controlled end and the second end of the second switch tube Q2 reaches the turn-on voltage threshold of the second switch tube Q2, at which time the second switch tube Q2 is turned on. In the present application, the first switch control circuit 21 and the second switch control circuit 22 respectively alternately control the conduction of the first switch tube Q1 and the second switch tube Q2 of the drive control circuit 30, so that the drive control circuit 30 can control the power tube to realize alternate opening and closing, thereby improving the efficiency of opening and closing the power tube, and improving the accuracy and reliability of the power tube control.

[0074] Optionally, in some feasible embodiments, reference Figure 3 The driving signal output circuit 10 includes a first chip U1, the first pin and the second pin of the first chip U1 are connected to the controller for receiving the wave signal, and the tenth pin and the ninth pin of the first chip U1 are respectively connected to the first switch control circuit 21 and the second switch control circuit 22 of the switch control circuit 20.

[0075] In this embodiment, the tenth pin and the ninth pin of the first chip U1 are used to output the first drive signal and the second drive signal, respectively. The third pin of the first chip U1 is used to receive a reset signal, and the fifth pin of the first chip U1 is used to output a fault signal. It should be noted that the first chip U1 can be a driver chip of any type of power tube, which is not limited in this embodiment. Compared with the existing IGBT drive circuit, different first drive signals and second drive signals are output for different drive chips. The present application only needs to adjust the circuit parameters of the first switch control circuit 21 and the second switch control circuit 22 to flexibly replace different drive chips to achieve the same drive effect, so that in the scenario where different drive chips drive multiple power tubes in parallel, the drive consistency is high, which enhances the stability of the parallel operation.

[0076] In one embodiment, reference Figure 4 , the driving circuit 100 further includes a reset circuit 40;

[0077] The reset circuit 40 is connected to the driving signal output circuit 10 , and is used to output a reset signal to the driving signal output circuit 10 when receiving a fault signal output by the driving signal output circuit 10 .

[0078] In this embodiment, after a short circuit fault occurs in the power tube, the drive signal output circuit 10 outputs a fault signal to the reset circuit 40. When the reset circuit 40 receives the fault signal output by the drive signal output circuit 10, it outputs a reset signal to the drive signal output circuit 10 to control the drive signal output circuit 10 to perform a reset operation, so that the drive circuit 100 can resume normal operation when the fault is eliminated. The existing drive circuit needs to use the short circuit protection and fault self-reset function of the drive chip to effectively shut down the tube when the drive chip fails. However, there is a problem that the drive chip cannot be reliably shut down when the drive chip fails, causing damage to the equipment. After a fault occurs, the controller often needs to send a reset signal to the drive chip to reliably reset it. When the software interface is tight, the use of the drive chip is limited. However, the present application can achieve hardware self-reset only through the reset circuit, thereby avoiding occupying the software interface.

[0079] Optionally, in some feasible embodiments, reference Figure 5 , the reset circuit includes a fourth chip U4, a fourth switch tube Q4, a fifth switch tube Q5, a third diode D3, a sixth capacitor C6, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14 and a fifteenth resistor R15;

[0080] The controlled end of the fourth switch tube Q4 is respectively connected to the first end of the third diode D3 and the second end of the tenth resistor R10, the second end of the third diode D3 is connected to the fault signal output end of the drive signal output circuit 10, the first end of the fourth switch tube Q4 is respectively connected to the first pin of the fourth chip U4 and the second end of the eleventh resistor R11, the first end of the sixth capacitor C6 is respectively connected to the third pin of the fourth chip U4, the fourth pin of the fourth chip U4, the second end of the twelfth resistor R12 and the second end of the thirteenth resistor R13, the first end of the thirteenth resistor R13 is connected to the second pin of the fourth chip U4, and the first end of the sixth capacitor C6 is respectively connected to the third pin of the fourth chip U4, the fourth pin of the fourth chip U4, the second end of the twelfth resistor R12 and the second end of the thirteenth resistor R13. The controlled end of the fifth switch tube Q5 is connected to the second end of the fourteenth resistor R14, the first end of the fourteenth resistor R14 is connected to the eighth pin of the fourth chip U4, the first end of the fifth switch tube Q5 is respectively connected to the second end of the fifteenth resistor R15 and the reset signal input end of the drive signal output circuit 10, the first end of the tenth resistor R10, the first end of the eleventh resistor R11, the first end of the twelfth resistor R12 and the first end of the fifteenth resistor R15 are respectively connected to the second power supply VCC, and the second end of the fourth switch tube Q4, the second end of the fifth switch tube Q5 and the second end of the sixth capacitor C6 are respectively grounded.

[0081] In this embodiment, when the driving circuit 10 works normally, the fault signal outputted from the fault signal output terminal of the driving signal output circuit 10 is at a high level, and the third diode D3 is cut off. At this time, the fourth switch tube Q4 is turned on, the first pin of the fourth chip U4 is at a low level, the eighth pin of the fourth chip U4 outputs a low level, the fifth switch tube Q5 is cut off, the reset signal continues to be at a high level, and at this time, the second pin of the fourth chip U4 is at a high level, and the voltages of the third and fourth pins of the fourth chip U4 are less than 1 / 3VCC. When the power tube fails, the fault signal is low level, the third diode D3 is turned on, the fourth switch tube Q4 is turned off, the first pin of the fourth chip U4 is high level, the eighth pin of the fourth chip U4 outputs high level, the fifth switch tube Q5 is turned on, the reset signal is low level, and the second pin of the fourth chip U4 is low level, the sixth capacitor C6 starts to charge, when the voltage of the third pin and the fourth pin of the fourth chip U4 is greater than 2 / 3VCC, the eighth pin of the fourth chip U4 outputs low level, the fifth switch tube Q5 is turned off, the reset signal is high level, the sixth capacitor C6 starts to discharge, and then the reset signal is low level, and after repeatedly sending out the reset signal of the pulse wave, when the driving circuit 100 resumes normal operation, the reset signal continues to be high level. Therefore, the driving signal output circuit 10 can determine whether a reset operation is required by judging the type of the reset signal. When the reset signal continues to be high level, the driving signal output circuit 10 maintains a normal working state, and when the reset signal is a pulse wave, the driving signal output circuit 10 needs to perform a reset operation. The present application can realize hardware self-reset only through the reset circuit, and when the driver chip fails, there is no need for the controller to send a reset signal to the driver chip, thereby avoiding occupying the software interface. It should be noted that in this embodiment, the fourth switch tube Q4 and the fifth switch tube Q5 are triodes, and in other embodiments, the fourth switch tube Q4 and the fifth switch tube Q5 can also be MOS tubes, IGBTs and other devices for realizing switch functions.

[0082] In one embodiment, reference Figure 6 , the driving circuit 100 further includes a power supply circuit 50;

[0083] The power supply circuit 50 is connected to the drive signal output circuit 10, the switch control circuit 20 and the drive control circuit 30 respectively. The power supply circuit 50 is used to convert the external power supply to power the drive signal output circuit 10, the switch control circuit 20 and the drive control circuit 30 respectively.

[0084] In this embodiment, the external power supply can be converted by the power supply circuit 50 to obtain a stable power supply suitable for the drive signal output circuit 10, the switch control circuit 20 and the drive control circuit 30, so as to ensure that the drive signal output circuit 10, the switch control circuit 20 and the drive control circuit 30 can work normally.

[0085] Optionally, in some feasible embodiments, reference Figure 7 , the power supply circuit 50 includes a tenth capacitor C10, an eleventh capacitor C11, a fourth diode D4, a sixth switch tube Q6 and a transformer;

[0086] A first end of the sixth switch tube Q6 is connected to a second end of the primary winding N1 of the transformer, a first end of the tenth capacitor C10 and a first end of the primary winding N1 are respectively connected to a positive electrode of a voltage input terminal of the power supply circuit 50, and a second end of the tenth capacitor C10 and a second end of the sixth switch tube Q6 are respectively connected to a negative electrode of the voltage input terminal;

[0087] A first end of the secondary winding N2 of the transformer is connected to a first end of a fourth diode D4, a second end of the fourth diode D4 and a first end of an eleventh capacitor C11 are respectively connected to a positive electrode of a voltage output end of the power supply circuit 50, and a second end of the secondary winding N2 and a second end of the eleventh capacitor C11 are respectively connected to a negative electrode of the voltage output end.

[0088] In this embodiment, when the sixth switch tube Q6 is turned on, the external power supply is converted into a power supply through a transformer, for example, the external power supply is converted into a first power supply. At this time, the positive and negative electrodes of the voltage output terminal are respectively connected to the corresponding ports of the drive signal output circuit 10, the switch control circuit 20 and the drive control circuit 30, so that the first power supply supplies power to the drive signal output circuit 10, the switch control circuit 20 and the drive control circuit 30 respectively.

[0089] Optionally, in other feasible embodiments, the power supply circuit 50 also includes a twelfth capacitor C12 and a fifth diode D5, the first end of the secondary winding N3 of the transformer is connected to the first end of the fifth diode D5, the second end of the fifth diode D5 and the first end of the twelfth capacitor C12 are respectively connected to the positive electrode of the second voltage output terminal of the power supply circuit 50, and the second end of the secondary winding N3 and the second end of the twelfth capacitor C12 are respectively connected to the negative electrode of the second voltage output terminal.

[0090] In this embodiment, the secondary side of the transformer may have two voltage outputs to respectively power multiple drive circuits in a parallel drive scenario.

[0091] The present application also proposes an electronic device, which includes the driving circuit of the power tube mentioned above. The specific structure of the driving circuit of the power tube refers to the above embodiment. Since the electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0092] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the application concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A driving circuit for a power tube, characterized in that: The driving circuit comprises: A driving signal output circuit, wherein the driving signal output circuit is used to output a driving signal when receiving a wave transmission signal; a switch control circuit, the switch control circuit being connected to the drive signal output circuit, and the switch control circuit being configured to output a switch control signal when receiving the drive signal; A drive control circuit, wherein the drive control circuit is connected to the switch control circuit and the power tube respectively, and the switch control circuit is used to control the power tube to be turned on or off when receiving the switch control signal.

2. The driving circuit of the power tube according to claim 1, characterized in that: The switch control circuit includes a first switch control circuit, the drive signal includes a first drive signal, and the switch control signal includes a first switch control signal; The first switch control circuit is used to output the first switch control signal to the drive control circuit when receiving the first drive signal, so that the drive control circuit controls the power tube to turn on.

3. The driving circuit of the power tube as claimed in claim 2, characterized in that: The first switch control circuit includes a second chip, a second resistor, a third resistor, a first diode and a fourth capacitor; The first end of the second resistor and the first end of the third resistor are respectively connected to the drive signal output circuit, the second end of the second resistor is connected to the second end of the first diode, the second end of the third resistor, the first end of the first diode and the first end of the fourth capacitor are respectively connected to the second pin of the second chip, the second end of the fourth capacitor is connected to the reference ground, and the fifth pin of the second chip is connected to the drive control circuit.

4. The driving circuit of the power tube as claimed in claim 3, characterized in that: The first switch control circuit further includes: a second diode, wherein the second end of the second diode is connected to the second pin of the second chip, and the first end of the second diode is connected to the reference ground terminal; and / or, A sixth resistor, wherein a first end of the sixth resistor is connected to the fifth pin of the second chip, and a second end of the sixth resistor is connected to the drive control circuit.

5. The driving circuit of the power tube as claimed in claim 2, characterized in that: The switch control circuit further includes a second switch control circuit, the drive signal further includes a second drive signal, and the switch control signal includes a second switch control signal; The second switch control circuit is used to output the second switch control signal to the drive control circuit when receiving the second drive signal, so that the drive control circuit controls the power tube to be turned off.

6. The driving circuit of the power tube as claimed in claim 5, characterized in that: The second switch control circuit includes a third chip, a fourth resistor, and a fifth resistor; The first end of the fourth resistor and the first end of the fifth resistor are respectively connected to the drive signal output circuit, the second end of the fifth resistor is connected to the second pin of the third chip, the second end of the fourth resistor is connected to the reference ground, and the fifth pin of the third chip is connected to the drive control circuit.

7. The driving circuit of the power tube according to claim 6, characterized in that: The second switch control circuit further includes a seventh resistor, a first end of the seventh resistor is connected to the fifth pin of the third chip, and a second end of the seventh resistor is connected to the drive control circuit.

8. The driving circuit of the power tube as claimed in claim 5, characterized in that: The drive control circuit includes a first switch tube, a second switch tube, an eighth resistor and a ninth resistor; The controlled end of the first switch tube is connected to the first switch control circuit, the first end of the first switch tube is connected to the positive electrode of the first power supply, the second end of the first switch tube is connected to the first end of the eighth resistor, and the second end of the eighth resistor is connected to the controlled end of the power tube; The controlled end of the second switch tube is connected to the second switch control circuit, the second end of the second switch tube is connected to the negative electrode of the first power supply, the first end of the second switch tube is connected to the first end of the ninth resistor, and the second end of the ninth resistor is connected to the controlled end of the power tube.

9. The driving circuit of the power tube according to claim 1, characterized in that: The driving circuit also includes a reset circuit; The reset circuit is connected to the drive signal output circuit, and is used to output a reset signal to the drive signal output circuit when receiving a fault signal output by the drive signal output circuit.

10. The driving circuit of the power tube according to claim 9, characterized in that: The reset circuit includes a fourth chip, a fourth switch tube, a fifth switch tube, a third diode, a sixth capacitor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor and a fifteenth resistor; The controlled end of the fourth switch tube is respectively connected to the first end of the third diode and the second end of the tenth resistor, the second end of the third diode is connected to the fault signal output end of the drive signal output circuit, the first end of the fourth switch tube is respectively connected to the first pin of the fourth chip and the second end of the eleventh resistor, the first end of the sixth capacitor is respectively connected to the third pin of the fourth chip, the fourth pin of the fourth chip, the second end of the twelfth resistor and the second end of the thirteenth resistor, the first end of the thirteenth resistor is connected to the second pin of the fourth chip, the controlled end of the fifth switch tube is connected to the second end of the fourteenth resistor, the first end of the fourteenth resistor is connected to the eighth pin of the fourth chip, the first end of the fifth switch tube is respectively connected to the second end of the fifteenth resistor and the reset signal input end of the drive signal output circuit, the first end of the tenth resistor, the first end of the eleventh resistor, the first end of the twelfth resistor and the first end of the fifteenth resistor are respectively connected to the second power supply, and the second end of the fourth switch tube, the second end of the fifth switch tube and the second end of the sixth capacitor are respectively grounded.

11. An electronic device, characterized in that: The electronic device comprises the driving circuit of the power tube according to any one of claims 1-10.

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