Driving circuit and electronic device

Abstract

The utility model provides a driving circuit and electronic equipment, and belongs to the technical field of electronic power. The circuit at least comprises a control unit, a signal output unit, a driving control unit and a feedback unit, the output end of the control unit is connected with the input end of the signal output unit, the input end of the control unit is connected with the output end of the feedback unit, and the control end of the control unit is connected with the control end of the driving control unit. And the output end of the signal output unit is connected with the input end of the driving control unit. A first output end of the driving control unit is connected with an input end of the feedback unit, and a second output end, a third output end and a fourth output end of the driving control unit are respectively used for connecting a gate pole, an emitting electrode and a collector electrode of a to-be-driven switching tube. According to the invention, the driving circuit can be suitable for circuits with different topological structures, so that the driving application range and practicability of the driving circuit are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to a driving circuit and an electronic device. BACKGROUND

[0002] With the rapid development of electronic technology, the Insulated Gate Bipolar Transistor (IGBT) has been widely applied, and the IGBT has the advantages of small driving power and low saturation voltage drop, and is therefore widely used in frequency converters, energy storage converters and other devices.

[0003] In the related art, a common scheme for driving the IGBT is to apply positive and negative voltages to the gate supply of the IGBT and to make the source of the IGBT always grounded. Specifically, when the IGBT needs to be turned on, a +15V positive voltage can be applied to the gate supply of the IGBT; when the IGBT needs to be turned off, a negative voltage of about -10V can be applied to the gate of the IGBT.

[0004] However, the driving logic of the related art scheme can generally only be applied to a circuit of one topology, and is difficult to be applied to a main power circuit or device of different topologies, and therefore the related art has the problems of small applicable range and poor practicability. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a driving circuit and an electronic device, which can make the driving circuit applicable to circuits of different topologies, so as to improve the applicable range and practicability of the driving circuit for driving.

[0006] Embodiments of the present application are implemented as follows:

[0007] In a first aspect, the present application provides a driving circuit, which at least comprises: a control unit, a signal output unit, a driving control unit and a feedback unit.

[0008] The output end of the control unit is connected to the input end of the signal output unit, the input end of the control unit is connected to the output end of the feedback unit, and the control end of the control unit is connected to the control end of the driving control unit; the feedback unit is configured to output a feedback signal to the control unit based on the driving control unit, the feedback signal being used to indicate the working state of the to-be-driven switching tube; the control unit is configured to output a pulse width modulation signal to the signal output unit and control the driving control unit to switch driving logic based on the feedback signal, the driving logic including two-level driving logic and three-level driving logic.

[0009] The output end of the signal output unit is connected with the input end of the drive control unit; the signal output unit is used for converting the pulse width modulation signal into a target signal and outputting the target signal to the drive control unit, so that the drive control unit is enabled;

[0010] The first output end of the drive control unit is connected with the input end of the feedback unit, and the second output end, the third output end and the fourth output end of the drive control unit are respectively used for connecting the gate, the emitter and the collector of the to-be-driven switching tube; the drive control unit is used for outputting a drive signal to each pole of the to-be-driven switching tube under the action of the drive logic and the target signal.

[0011] Optionally, the drive control unit comprises a logic gate circuit, a drive unit, a protection unit and at least one capacitor adjustment unit.

[0012] The first end of the logic gate circuit is connected with the output end of the signal output unit, the second end of the logic gate circuit is connected with the input end of the feedback unit, the third end and the fourth end of the logic gate circuit are respectively connected with the first input end and the second input end of the drive unit, and the fifth end of the logic gate circuit is used for inputting a first working voltage.

[0013] The sixth end of the logic gate circuit is connected with the input end of the protection unit, the power supply end of the protection unit is used for inputting the first working voltage, and the third end and the fourth end of the protection unit and the fifth end and the sixth end of the protection unit are respectively connected with the capacitor adjustment unit.

[0014] The first output end and the second output end of the drive unit are respectively used for connecting the gate and the emitter of the to-be-driven switching tube, and the third end of the protection unit is further used for connecting the collector of the to-be-driven switching tube; and the second output end of the drive unit is further connected with the fourth end of the protection unit.

[0015] The capacitor adjustment unit is used for adjusting the capacitance value connected to the protection unit under the control of the control unit, so as to adjust the action timing of the protection unit.

[0016] Optionally, the logic gate circuit comprises an exclusive OR gate circuit and an AND gate circuit.

[0017] The input end of the XOR gate circuit is connected with the output end of the signal output unit, the power supply end, the first input end and the second input end of the XOR gate circuit are respectively used for inputting the first working voltage, the first output end of the XOR gate circuit is respectively connected with the third input end of the XOR gate circuit, the first input end of the AND gate circuit and the first input end of the driving unit, and the second output end of the XOR gate circuit is respectively connected with the fourth input end of the XOR gate circuit and the second input end of the driving unit.

[0018] The fifth input end and the sixth input end of the XOR gate circuit are respectively connected with the first output end and the second output end of the AND gate circuit, and the third output end and the fourth output end of the XOR gate circuit are respectively connected with the second input end and the third input end of the AND gate circuit.

[0019] The power supply end, the fourth input end, the fifth input end, the sixth input end and the seventh input end of the AND gate circuit are respectively used for inputting the first working voltage, and the third output end of the AND gate circuit is connected with the input end of the feedback unit.

[0020] Optionally, the feedback unit comprises a first isolation device.

[0021] The first input end of the first isolation device is used for inputting the first working voltage, the second input end of the first isolation device is used for connecting the second end of the logic gate circuit, the first output end of the first isolation device is used for connecting the second working voltage, and the second output end of the first isolation device is connected with the input end of the control unit.

[0022] Optionally, the driving unit comprises a switch tube driver and a push-pull unit.

[0023] The first input end and the second input end of the switch tube driver are respectively connected with the third end and the fourth end of the logic gate circuit, the first output end and the second output end of the switch tube driver are respectively connected with the first control end and the second control end of the push-pull unit, and the power supply end of the switch tube driver is used for inputting the second working voltage.

[0024] The power supply end of the push-pull unit is used for inputting the third working voltage, the first output end and the second output end of the push-pull unit are respectively used for connecting the gate and the emitter of the to-be-driven switch tube, and the second output end of the push-pull unit is also connected with the fourth end of the protection unit.

[0025] The push-pull unit is used for outputting a driving voltage to the gate and the emitter of the to-be-driven switch tube under the action of the driving signal output by the switch tube driver.

[0026] Optionally, the protection unit further comprises a timer, a first switch tube, a second switch tube, a first capacitor, and a second capacitor; the capacitor adjustment unit comprises a first capacitor adjustment unit and a second capacitor adjustment unit;

[0027] The power supply pin of the timer is connected with the ground pin of the timer, the first plate of the first capacitor, and the first end of the first capacitor adjustment unit respectively, the discharge pin of the timer is used for inputting the first working voltage, the trigger pin of the timer is connected with the second plate of the first capacitor, the second end of the capacitor adjustment unit, and the first pole of the first switch tube respectively, the output pin of the timer is connected with the second pole of the first switch tube, and the threshold pin of the timer is connected with the first pole of the second switch tube, the first plate of the second capacitor, and the first end of the second capacitor adjustment unit respectively;

[0028] The comparison pin of the timer is connected with the second output end of the driving unit, and the power supply pin of the timer and the third pole of the first switch tube are used for inputting the second working voltage respectively;

[0029] The second pole of the second switch tube is connected with the sixth end of the logic gate circuit, the third pole of the second switch tube is connected with the second pole of the second switch tube, and the third pole of the second switch tube is grounded.

[0030] Optionally, the first capacitor adjustment unit comprises a first switch and a third capacitor; the control end of the first switch is connected with the control end of the control unit, and the first switch and the third capacitor are connected between the first plate and the second plate of the first capacitor;

[0031] The first switch is used for being turned off when the driving logic is a two-level driving logic, and the first switch is used for being turned on when the driving logic is a three-level driving logic.

[0032] The second capacitor adjustment unit comprises a second switch and a fourth capacitor; the control end of the second switch is connected with the control end of the control unit, and the second switch and the fourth capacitor are connected between the first plate and the second plate of the second capacitor;

[0033] The second switch is used for being turned off when the driving logic is a two-level driving logic, and the second switch is used for being turned on when the driving logic is a three-level driving logic.

[0034] Optionally, the protection unit further comprises a third switch tube and a first diode;

[0035] The first electrode of the third switch tube is connected with the output pin of the timer and the second electrode of the first switch tube respectively, the second electrode of the third switch tube is connected with the reset pin of the timer, the second electrode of the third switch tube is also connected with the third electrode of the third switch tube through the first diode, and the third electrode of the third switch tube is also used for inputting the second working voltage.

[0036] Optionally, the signal output unit comprises a second isolation device;

[0037] The first input end of the second isolation device is connected with the output end of the control unit, the second input end of the second isolation device is grounded, the first output end of the second isolation device is used for inputting the first working voltage, the second output end of the second isolation device is connected with the input end of the drive control unit, and the third output end of the second isolation device is grounded.

[0038] In a second aspect, the embodiment of the present application provides an electronic device, which comprises a plurality of the drive circuit provided in the first aspect.

[0039] The embodiment of the present application has the following beneficial effects:

[0040] The drive circuit provided by the embodiment of the present application comprises a control unit, a signal output unit, a drive control unit and a feedback unit. Specifically, the output end of the control unit is connected with the input end of the signal output unit, the input end of the control unit is connected with the output end of the feedback unit, and the control end of the control unit is connected with the control end of the drive control unit. The output end of the signal output unit is connected with the input end of the drive control unit.

[0041] The first output end of the drive control unit is connected with the input end of the feedback unit, and the second output end, the third output end and the fourth output end of the drive control unit are respectively used for connecting the gate, the emitter and the collector of the switch tube to be driven.

[0042] The control unit can output corresponding pulse width modulation signals to the drive control unit through the signal output unit, so that the drive control unit is enabled, and then the feedback signal used for indicating the working state of the switch tube to be driven in the electronic device is obtained. The control unit can also determine the driving logic currently required according to the feedback signal. Then, the drive control unit is switched to two-level driving logic or three-level driving logic according to the feedback signal, so that the drive control unit can drive the devices of two-level main power topology or three-level main power topology respectively.

[0043] In this way, the drive circuit can be applied to circuits with different topological structures, so as to improve the application range and practicability of the drive circuit. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0045] Figure 1 The structural schematic diagram of the first driving circuit provided by the embodiments of the present application is shown in the following figure:

[0046] Figure 2 The structural schematic diagram of the second driving circuit provided by the embodiments of the present application is shown in the following figure:

[0047] Figure 3 The structural schematic diagram of the third driving circuit provided by the embodiments of the present application is shown in the following figure:

[0048] Figure 4 The schematic diagram of a driving logic provided by the embodiments of the present application is shown in the following figure:

[0049] Figure 5 The structural schematic diagram of the fourth driving circuit provided by the embodiments of the present application is shown in the following figure:

[0050] Figure 6 The structural schematic diagram of the fifth driving circuit provided by the embodiments of the present application is shown in the following figure:

[0051] Figure 7 The structural schematic diagram of the sixth driving circuit provided by the embodiments of the present application is shown in the following figure:

[0052] Figure 8 The structural schematic diagram of the seventh driving circuit provided by the embodiments of the present application is shown in the following figure:

[0053] Figure 9 The structural schematic diagram of the eighth driving circuit provided by the embodiments of the present application is shown in the following figure. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine 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 some of the embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor are within the scope of protection of the application.

[0056] It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0057] In the description of the application, it should be noted that the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0058] In the description of the application, it should also be noted that unless otherwise specified and limited, the terms "set", "mount", "connect", "connect" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0059] A common scheme for driving IGBT is to apply positive and negative voltages to the gate of IGBT for power supply, and to make the source of IGBT constant ground. Specifically, when IGBT needs to be turned on, +15V positive voltage can be applied to the gate of IGBT for power supply; when IGBT needs to be turned off, -10V or so negative voltage can be applied to the gate of IGBT.

[0060] However, the driving logic of the related technical scheme can generally only be applied to a circuit of one topology, and it is difficult to be applied to a main power circuit or device of different topologies, so the related technology has the problems of small applicable range and poor practicability.

[0061] To this end, the embodiment of the present application provides a driving circuit, by setting a control unit, a signal output unit, a driving control unit, a feedback unit in the driving circuit. And the output end of the control unit is connected with the input end of the signal output unit, the input end of the control unit is connected with the output end of the feedback unit, the control end of the control unit is connected with the control end of the driving control unit. The output end of the signal output unit is connected with the input end of the driving control unit; the first output end of the driving control unit is connected with the input end of the feedback unit, the second output end, the third output end and the fourth output end of the driving control unit are respectively used for connecting the gate, the emitter and the collector of the to-be-driven switching tube; the driving control unit is used for outputting driving signals to each pole of the to-be-driven switching tube under the action of the driving logic and the target signal. In this way, the driving circuit can be applied to circuits with different topological structures, so as to improve the application range and practicability of the driving circuit for driving.

[0062] The embodiment of the present application takes the driving circuit applied in the electronic device for driving IGBT as an example for description. But it does not mean that the embodiment of the present application can only be applied to driving IGBT.

[0063] Optionally, the electronic device can be any possible device including IGBT, such as energy storage converter, frequency converter, DC-DC converter, etc., and the embodiment of the present application does not limit this.

[0064] The driving circuit provided by the embodiment of the present application will be explained and described in detail below.

[0065] Figure 1 The structure diagram of the driving circuit provided by the present application is shown in FIG. 1. Referring to FIG. 1, the embodiment of the present application provides a driving circuit, which comprises a control unit 101, a signal output unit 102, a driving control unit 103 and a feedback unit 104. Figure 1 The embodiment of the present application provides a driving circuit, which comprises a control unit 101, a signal output unit 102, a driving control unit 103 and a feedback unit 104.

[0066] The output end of the control unit 101 is connected with the input end of the signal output unit 102, the input end of the control unit 101 is connected with the output end of the feedback unit 104, and the control end of the control unit 101 is connected with the control end of the driving control unit 103.

[0067] The output end of the signal output unit 102 is connected with the input end of the driving control unit 103.

[0068] The first output end of the driving control unit 103 is connected with the input end of the feedback unit 104, and the second output end, the third output end and the fourth output end of the driving control unit 103 are respectively used for connecting the gate, the emitter and the collector of the to-be-driven switching tube.

[0069] The feedback unit 104 is configured to output a feedback signal to the control unit 101 based on the driving control unit 103. The feedback signal is used to indicate the working state of the to-be-driven switch tube.

[0070] The control unit 101 is configured to output a pulse width modulation signal to the signal output unit 102, and control the driving control unit 103 to switch the driving logic based on the feedback signal.

[0071] The signal output unit 102 is configured to convert the pulse width modulation signal into a target signal, and output the target signal to the driving control unit 103, so that the driving control unit 103 is enabled.

[0072] The driving control unit 103 is configured to output a driving signal to each pole of the to-be-driven switch tube under the action of the driving logic and the target signal.

[0073] Optionally, the control unit 101 can be any element with processing, control, recognition, judgment and the like, and the control unit 101 can include one processing element or multiple processing elements. For example, the control unit 101 can include a DSP and an FPGA, and different operations are performed by the DSP and the FPGA respectively, which is not limited in the embodiments of the present application.

[0074] Optionally, the signal output unit 102 can have signal isolation and power isolation functions, which can be realized by optical coupling isolation, pulse transformer isolation, optical fiber isolation and the like, so as to separate the high-voltage domain and the low-voltage domain in the circuit 100, and further avoid damaging the elements in the circuit 100.

[0075] It can be seen that the signal output unit 102 can be specifically configured to convert the voltage level, current size and the like of the pulse width modulation signal, and output the converted signal as the target signal to the driving control unit 103.

[0076] Optionally, the driving control unit 103 can specifically detect and / or determine the working state of the to-be-driven switch tube under the action of the target signal, and output a corresponding indication signal to the feedback unit 104 based on the working state of the to-be-driven switch tube.

[0077] The working state can include a normal working state of the to-be-driven switch tube and a fault state of the to-be-driven switch tube. The fault state of the to-be-driven switch tube can be caused by over-current protection of the to-be-driven switch tube, or caused by hardware failure of the to-be-driven switch tube, which is not limited in the embodiments of the present application.

[0078] Optionally, the feedback unit 104 is specifically configured to receive an indication signal output by the drive control unit 103, and convert the indication signal into the feedback signal output to the control unit 101, so that the control unit 101 determines and / or knows the working state of the to-be-driven switch tube.

[0079] Further, the feedback unit 104 can also have the functions of signal isolation and power supply isolation, and specifically can realize the isolation function of the feedback unit 104 through optical coupling isolation, pulse transformer isolation, optical fiber isolation and the like, so as to ensure the separation of the high-voltage domain and the low-voltage domain in the circuit 100, and further avoid causing damage to the elements in the circuit 100.

[0080] Optionally, the to-be-driven switch tube can be an IGBT in any device or any other device that needs to be driven by voltage, and the embodiments of the present application do not limit this.

[0081] Exemplarily, continuing to refer to Figure 1 , if the to-be-driven switch tube is an IGBT, then the gate, emitter and collector of the to-be-driven switch tube can be the G, E and C poles of the IGBT shown in Figure 1 .

[0082] Specifically, the drive logic refers to a control mode in which the drive control unit 103 outputs high or low level control to the gate G, emitter E and collector C of the to-be-driven switch tube by inputting high and low levels of PWM.

[0083] At the same time, whether the circuit 100 is in a protection state can also be determined by the high and low levels of the feedback signal. Generally, if the feedback signal is high, it can be determined that the to-be-driven switch tube is normal, and the circuit 100 is not in a protection state; if the feedback signal is low, it can be determined that the to-be-driven switch tube is faulty, and the circuit 100 is in a protection state,

[0084] Optionally, the drive logic includes two-level drive logic and three-level drive logic.

[0085] Exemplarily, if multiple circuits 100 are provided in an electronic device, then the type of power main topology of the electronic device can be determined by identifying different combinations of high and low levels of the feedback signal corresponding to each circuit 100.

[0086] For example, if the electronic device is a frequency converter, and the frequency converter is a two-level main power topology, there are only two IGBT tubes in any bridge arm of the frequency converter, and multiple circuits 100 can be arranged in the electronic device for driving. In this case, when detecting the main power topology of the frequency converter, the feedback signal of any bridge arm of the frequency converter with only two IGBT tubes is high level, and other feedback signals are low level, and the control unit 101 can determine that the electronic device needs to use two-level driving logic according to the feedback signal.

[0087] If the electronic device is an energy storage converter, and the frequency converter is a three-level main power topology, there are four IGBT tubes in any bridge arm of the energy storage converter, and two of the four IGBTs are outer tubes and the other two are inner tubes, and multiple circuits 100 can be arranged in the electronic device for driving. In this case, the feedback signal of any bridge arm of the energy storage converter with four IGBT tubes is high level, and the feedback signal corresponding to each circuit 100 can indicate that the electronic device needs to use three-level driving logic.

[0088] It can be understood that, since the outer tube must be turned off first and then the inner tube when the three-level main power topology is turned off, otherwise it may cause damage to the IGBT, therefore the three-level driving logic can have the functions of software overcurrent protection, IGBT switch tube timing protection, and / or IGBT hardware overcurrent protection.

[0089] However, the two-level main power topology can turn off the two IGBTs at the same time when turning off the tubes, so the two-level driving logic can only have the functions of IGBT hardware overcurrent protection and software overcurrent protection.

[0090] That is, the driving control unit 103 can at least have the functions of IGBT hardware overcurrent protection and software overcurrent protection, and in the case of switching to three-level driving logic, the driving control unit 103 can also have the function of IGBT switch tube timing protection. These functions can be realized by writing corresponding programs to the processing device in the driving control unit 103 and / or by using corresponding circuit structures, and the embodiments of the present application do not limit this.

[0091] In the present embodiment, when the control unit 101 controls the driving control unit 103 to switch the driving logic, the IGBT switch tube timing protection of the driving control unit 103 can be turned on or off by changing the size of the capacitor inside the driving control unit 103, so that the driving control unit 103 can be switched between three-level driving logic and two-level driving logic.

[0092] Optionally, the driving signal can include a high level signal and a low level signal.

[0093] Optionally, the drive control unit 103 can output a high level signal or a low level signal to each pole of the switch tube to be driven under the action of the target signal, and perform software over-current protection, IGBT hardware over-current protection, and / or IGBT switch tube timing protection on the switch tube to be driven under the action of the drive logic.

[0094] It is worth noting that when the circuit 100 provided in the embodiment is applied to drive each IGBT in a corresponding electronic device, the control unit 101 can output a corresponding pulse width modulation signal to the drive control unit 103 through the signal output unit 102, so that the drive control unit 103 is enabled, and then a feedback signal for indicating the working state of the IGBT in the electronic device is obtained, and the control unit 101 can also determine the drive logic currently required according to the feedback signal. Further, according to the feedback signal, the drive control unit 103 is switched to two-level drive logic or three-level drive logic, so that the drive control unit 103 can drive the devices of two-level main power topology or three-level main power topology, respectively.

[0095] In this way, the drive circuit 100 can be applied to circuits with different topologies, so as to improve the application range and practicability of the drive circuit 100.

[0096] In the embodiment of the application, the control unit 101, the signal output unit 102, the drive control unit 103, and the feedback unit 104 are arranged in the drive circuit 100. Specifically, the output end of the control unit 101 is connected with the input end of the signal output unit 102, the input end of the control unit 101 is connected with the output end of the feedback unit 104, and the control end of the control unit 101 is connected with the control end of the drive control unit 103. The output end of the signal output unit 102 is connected with the input end of the drive control unit 103.

[0097] The first output end of the drive control unit 103 is connected with the input end of the feedback unit 104, and the second output end, the third output end, and the fourth output end of the drive control unit 103 are respectively used to connect the gate, the emitter, and the collector of the switch tube to be driven.

[0098] The corresponding pulse width modulation signal can be output by the control unit 101 to the drive control unit 103 through the signal output unit 102, so that the drive control unit 103 is enabled, and then a feedback signal for indicating the working state of the IGBT in the electronic device is obtained, and the control unit 101 can also determine the driving logic currently required according to the feedback signal. Further, the drive control unit 103 is switched to two-level driving logic or three-level driving logic according to the feedback signal, so that the drive control unit 103 can drive the devices of the two-level main power topology or the three-level main power topology, respectively.

[0099] In this way, the drive circuit 100 can be applied to circuits with different topologies, so as to improve the application range and practicability of the drive circuit 100.

[0100] In addition, the drive control unit 103 can also provide software overcurrent protection, IGBT hardware overcurrent protection, and / or IGBT switch timing protection for the to-be-driven switch tube, so as to prevent damage of the to-be-driven switch tube caused by overcurrent problems and / or timing errors of turn-off, and further improve the safety and reliability of the drive circuit 100.

[0101] In one possible implementation, referring to Figure 2 The drive control unit 103 includes a logic gate circuit 1031, a drive unit 1032, a protection unit 1033, and at least one capacitor adjustment unit 1034.

[0102] The first end of the logic gate circuit 1031 is connected with the output end of the signal output unit 102, the second end of the logic gate circuit 1031 is connected with the input end of the feedback unit 104, the third end and the fourth end of the logic gate circuit 1031 are respectively connected with the first input end and the second input end of the drive unit 1032, and the fifth end of the logic gate circuit 1031 is used for inputting a first working voltage.

[0103] The sixth end of the logic gate circuit 1031 is connected with the input end of the protection unit 1033, the power supply end of the protection unit 1033 is used for inputting the first working voltage, and the third end and the fourth end of the protection unit 1033 and the fifth end and the sixth end of the protection unit 1033 are respectively used for connecting the capacitor adjustment unit 1034.

[0104] The first output end and the second output end of the drive unit 1032 are respectively used for connecting the gate and the emitter of the to-be-driven switch tube, the third end of the protection unit 1033 is also used for connecting the collector of the to-be-driven switch tube, and the second output end of the drive unit 1032 is also connected with the fourth end of the protection unit 1033.

[0105] The capacitor adjusting unit 1034 is configured to adjust the capacitance value of the access protection unit 1033 under the control of the control unit 101, so as to adjust the action timing of the protection unit 1033.

[0106] Generally, the greater the capacitance value of the access protection unit 1033, the more delayed the timing of the protection unit 1033, that is, the later the protection unit 1033 turns off the switch tube to be driven.

[0107] Optionally, the logic gate circuit 1031 can include any possible logic gate element such as an AND gate, a NOT gate, an XOR gate, etc., and the embodiments of the present application do not limit this.

[0108] Specifically, the logic gate circuit 1031 can be configured to generate the above-mentioned indication signal according to the working state of the switch tube to be driven and output the indication signal to the feedback unit 104, and can also be configured to control the drive unit 1032 to output a high-level signal or a low-level signal to the switch tube to be driven based on the pulse width modulation signal.

[0109] Optionally, the protection unit 1033 can realize the function of turning off the switch tube to be driven, and specifically can turn off the switch tube to be driven in the case of overcurrent, etc. The protection unit 1033 can include corresponding switch tubes, processing units, etc., and the embodiments of the present application do not limit this.

[0110] Furthermore, the protection unit 1033 can also output a corresponding drive signal to the collector of the switch tube to be driven.

[0111] Optionally, the capacitor adjusting unit 1034 can specifically include corresponding capacitors, which can be connected in parallel or in series to the circuit of the protection unit 1033 when needed, so as to change the capacitance value of the access protection unit 1033. The embodiments of the present application do not limit this.

[0112] Optionally, the first working voltage (such as VDD1 shown in the figure) can be a voltage of any voltage level, such as 5V, and can be selected according to the parameters of the elements in the drive control unit 103, and the embodiments of the present application do not limit this.

[0113] Exemplarily, since the second output end of the drive unit 1032 is also connected to the fourth end of the protection unit 1033, the drive voltage output by the drive unit 1032 to the emitter E of the switch tube to be driven is also output to the protection unit 1033. Then the protection unit 1033 can also take the drive voltage output by the drive unit 1032 to the emitter E of the switch tube to be driven as a reference voltage, and determine whether overcurrent protection is needed according to the reference voltage.

[0114] Specifically, when the reference voltage is less than the voltage of the driving signal outputted by the protection unit 1033 to the collector of the switch tube to be driven, it can be determined that overcurrent protection needs to be performed. When the reference voltage is greater than or equal to the voltage of the driving signal outputted by the protection unit 1033 to the collector of the switch tube to be driven, it can be determined that overcurrent protection does not need to be performed. The embodiments of the present application do not limit this.

[0115] It can be understood that in this way, the overcurrent protection function of the switch tube to be driven can be realized by the driving control unit 103, and the turn-off time of the switch tube to be driven can be further delayed by changing the capacitance value connected to the protection unit 1033 to adjust the action timing of the protection unit 1033.

[0116] Then, if the driving circuit 100 is an inner tube in an electronic device for driving a three-level main power topology, the inner tube driven by the driving circuit 100 can be delayed to turn off by adjusting the capacitance value connected to the protection unit 1033 in the driving circuit 100, so as to realize the purpose of turning off the outer tube first and then turning off the inner tube, thereby preventing the occurrence of the straight-through phenomenon and protecting the devices in the circuit 100.

[0117] In a possible implementation manner, referring to Figure 3 , the logic gate circuit 1031 comprises an exclusive OR gate circuit U1 and an AND gate circuit U2.

[0118] The input end of the exclusive OR gate circuit U1 (2A pin of U1 in Figure 3 ) is connected with the output end of the signal output unit 102, the power supply end (VCC pin of U1) of the exclusive OR gate circuit U1, the first input end (4V pin of U1) and the second input end (3B pin of U1) of the exclusive OR gate circuit U1 are used for inputting the first working voltage respectively, the first output end (4Y pin of U1) of the exclusive OR gate circuit U1 is connected with the third input end (1A pin of U1) of the exclusive OR gate circuit U1, the first input end of the driving unit 1032 and the first input end (4A pin of U2) of the AND gate circuit U2 respectively, and the second output end (3Y pin of U1) of the exclusive OR gate circuit U1 is connected with the fourth input end (4A pin of U1) of the exclusive OR gate circuit U1 and the second input end of the driving unit 1032 respectively.

[0119] The fifth input end (3A pin of U1) and the sixth input end (1B pin of U1) of the exclusive OR gate circuit U1 are connected with the first output end (3Y pin of U1) and the second output end (4Y pin of U1) of the AND gate circuit U2 respectively, and the third output end (1Y pin of U1) and the fourth output end (2Y pin of U1) of the exclusive OR gate circuit U1 are connected with the second input end (2B pin of U1) and the third input end (3B pin of U1) of the AND gate circuit U2 respectively.

[0120] The power supply end of the AND gate circuit U2 (the VCC pin of U2), the fourth input end (the 4B pin of U2), the fifth input end (the 3A pin of U2), the sixth input end (the 1A pin of U2), and the seventh input end (the 2A pin of U2) are respectively used for inputting a first working voltage, and the third output end (the 2Y pin of U2) of the AND gate circuit U2 is connected with the input end of the feedback unit 104.

[0121] Optionally, the fifth input end of the AND gate circuit U2 can input the first working voltage through the resistor Ra. The resistor Ra can be used for current limiting and / or voltage dividing.

[0122] In addition, the capacitor Ca and the capacitor Cb can also be included in the logic gate circuit 1031 as filter capacitors for inputting the first working voltage.

[0123] Exemplarily, on the basis of Figure 3 , reference is made to Figure 4 , the driving logic provided by the embodiments of the present application is shown in Figure 4 , in which 0 represents a low level, 1 represents a high level, the DISCH signal is a variable level, and a high level is inputted in a normal case. When overvoltage protection occurs in the circuit 100, the input port signal is pulled low, and thus the low level is inputted.

[0124] In addition, Figure 4 , the MOSA refers to the driving unit 1032 described above, the optocoupler outputting the feedback signal (the ST signal in Figure 4 ) refers to the feedback unit 104 described above, and the optocoupler inputting the pulse width modulation signal (the PWM in Figure 4 ) refers to the signal output unit 102 described above.

[0125] It should be noted that, from the driving logic of Figure 4 , it can be determined that when DISCH = 1, the feedback signal outputs 1; and when the pulse width modulation signal input is 1, the IGBT gate is 1 after processing, and the IGBT is turned on; when the pulse width modulation signal input is 0, the IGBT gate is 0, and at this time, the IGBT is turned off.

[0126] When DISCH = 0, the feedback signal outputs 0, and the IGBT gate is 0 when the pulse width modulation signal input is 1 or 0, and at this time, the driving circuit 100 is in a protection state.

[0127] Therefore, when DISCH = 1, the feedback signal output is 1, which indicates that the driving circuit 100 is in a normal working state, in which case, if the pulse width modulation signal input is 1, the IGBT is turned on, and if the pulse width modulation signal input is 0, the IGBT is turned off. When DISCH = 0, the feedback signal output is 0, that is, no matter whether the pulse width modulation signal input is 1 or 0, the MOSA outputs 0, and the IGBT is in an off state.

[0128] In this way, the feedback signal (and / or indication signal) can be obtained through the logic gate circuit 1031 to know the working state of the switch tube to be driven, and the logic gate circuit 1031 is used to drive the switch tube to be driven.

[0129] In a possible implementation, referring to Figure 5 , the feedback unit 104 includes a first isolation device A1.

[0130] The first input end of the first isolation device A1 is configured to input a first working voltage, the second input end of the first isolation device A1 is configured to be connected to the second end of the logic gate circuit 1031, the first output end of the first isolation device A1 is configured to be connected to a second working voltage, and the second output end of the first isolation device A1 is connected to the input end of the control unit 101.

[0131] Optionally, the second working voltage can be Figure 5 VDD2 as shown, and the voltage level of the second working voltage can be higher than that of the first working voltage. For example, the second working voltage can be 15 V, or can be any other possible level, which is not limited in the embodiments of the present application.

[0132] Optionally, the first isolation device A1 is configured to realize high-low voltage isolation, so that the feedback unit 104 has the functions of signal isolation and power isolation to avoid damaging the elements in the circuit 100.

[0133] For example, continuing to refer to Figure 5 , the feedback unit 104 can further include a resistor Rb connected between the first input end and the second input end of the first isolation device A1, and a capacitor Cc connected between the first output end and the second output end of the first isolation device A1.

[0134] In this way, the electrical isolation between the driving control unit 103 and the control module 101 can be realized.

[0135] In a possible implementation, referring to Figure 6 , the signal output unit 102 includes a second isolation device A2.

[0136] The first input end of the second isolation device A2 is connected with the output end of the control unit 101, the second input end of the second isolation device A2 is grounded, the first output end of the second isolation device is used for inputting the first working voltage, the second output end of the second isolation device A2 is connected with the input end of the drive control unit 103, and the third output end of the second isolation device A2 is grounded.

[0137] Optionally, the second isolation device A2 is used for realizing high-low voltage isolation, so that the signal output unit 102 has the functions of signal isolation and power supply isolation, so as to avoid damaging the elements in the circuit 100.

[0138] Exemplarily, continuing to refer to Figure 6 , the signal output unit 102 can further include a resistor Rx connected to the second input end of the second isolation device A2, a resistor Ry connected between the first input end and the second input end of the second isolation device A2, a resistor Rz connected to the second output end of the second isolation device A2, and a capacitor Cq connected between the first output end and the third output end of the second isolation device A2. Wherein, each resistor and each capacitor is respectively used for realizing functions such as voltage division, current limiting, filtering, etc.

[0139] In this way, the electrical isolation between the drive control unit 103 and the control module 101 can be realized.

[0140] In a possible implementation manner, referring to Figure 7 , the drive unit 1032 includes a switch tube driver K and a push-pull unit T.

[0141] The first input end and the second input end of the switch tube driver K are respectively connected with the third end and the fourth end of the logic gate circuit 1031, the first output end and the second output end of the switch tube driver K are respectively connected with the first control end and the second control end of the push-pull unit T, and the power supply end of the switch tube driver K is used for inputting the second working voltage.

[0142] The power supply end of the push-pull unit T is used for inputting the third working voltage, and the first output end and the second output end of the push-pull unit T are respectively used for connecting the gate and the emitter of the switch tube to be driven. The second output end of the push-pull unit T is further connected with the fourth end of the protection unit 1033.

[0143] Wherein, the push-pull unit T is used for outputting a driving voltage to the gate and the emitter of the switch tube to be driven under the action of the driving signal output by the switch tube driver K.

[0144] Optionally, the third working voltage can be any possible level voltage, and the third working voltage can be the same voltage as the first working voltage or the second working voltage. The third working voltage can be selected according to actual needs, and the embodiments of the present application do not limit this.

[0145] Optionally, the switch tube driver K can be a MOSA as shown in Figure 4 , and is specifically configured to provide a driving current and / or other driving signals to the push-pull unit T. The switch tube driver K can be any possible MOS driving chip, and the embodiments of the present application do not limit the same.

[0146] Optionally, the push-pull unit T can be built by a PNP type transistor and an NPN type transistor. The main function is to amplify the current, so as to provide a large enough driving current for the switch tube to be driven. In the present application, two similar structures are connected in parallel to provide a large enough peak driving current. After the parallel output is passed through a driving resistor for limiting the amplitude of the driving peak current, the IGBT is driven. When the resistance value of the driving resistor is small, the driving current can be oscillated. If the driving resistor is too small, the electromagnetic compatibility (EMC) effect will be affected.

[0147] Specifically, continuing to refer to Figure 7 , the push-pull unit T can include a transistor Qa, a transistor Qb, a transistor Qc, a transistor Qd, and a capacitor Cd. The specific connection structure is shown in Figure 6 , and the embodiments of the present application do not repeat the same here.

[0148] It should be noted that the push-pull unit T adopted in the embodiments of the present application generates two paths of +15V complementary pulses, which are respectively applied to the gate and source of the switch tube to be driven. That is, when the switch tube to be driven needs to be turned on, +15V is applied to the gate, and 0V pulse is applied to the source; when the switch tube to be driven needs to be turned off, 0V is applied to the gate, and +15V pulse is applied to the source. In this way, only one +15V power supply is needed, which can simplify the design of the driving unit 1032.

[0149] In addition, the push-pull driving chip with the power isolation function can also be selected as the push-pull unit T in the embodiments of the present application, such as the push-pull driving chip with the model number UCC2808. Only one resistor and one capacitor are needed to set the working frequency of the push-pull driving chip, and two paths of complementary pulses can be output at the same time.

[0150] In a possible implementation manner, referring to Figure 8 , the protection unit 1033 further includes a timer S, a first switch tube Q1, a second switch tube Q2, a first capacitor C1, and a second capacitor C2. The capacitor adjustment unit 1034 includes a first capacitor adjustment unit J1 and a second capacitor adjustment unit J2.

[0151] The power supply pin (V+) in the Figure 8 of the timer S is connected with the ground pin (GND) in the Figure 8 of the timer S, the first plate of the first capacitor C1, and the first end of the first capacitor adjustment unit J1, respectively. The discharge pin (OC) of the timer S is connected with the first plate of the second capacitor C2, the second plate of the first capacitor C1, the first plate of the second capacitor adjustment unit J2, and the second plate of the first capacitor adjustment unit J1, respectively.Figure 8 The DIS pin is used to input the first operating voltage (which can be input by connecting it to the fifth terminal of logic gate 1031), and the trigger pin of timer S ( Figure 8 The TR pin of the timer S is connected to the second plate of the first capacitor C1, the second terminal of the capacitor adjustment unit 1034, and the first terminal of the first switching transistor Q1, respectively. Figure 8 The O pin of the timer S is connected to the second terminal of the first switching transistor Q1, and the threshold pin of the timer S is connected to the second terminal of the first switching transistor Q1. Figure 8 The THR in the second capacitor is connected to the first terminal of the second switching transistor Q2, the first plate of the second capacitor, and the first end of the second capacitor adjustment unit J2.

[0152] The compare pin of timer S ( Figure 8 The CV in the timer is connected to the second output terminal of the drive unit 1032, and the power supply pin of the timer S and the third terminal of the first switching transistor Q1 are respectively used to input the second working voltage.

[0153] The second terminal of the second switch Q2 is connected to the sixth terminal of the logic gate circuit 1031, the third terminal of the second switch Q2 is connected to the second terminal of the second switch Q2, and the third terminal of the second switch Q2 is grounded.

[0154] Optionally, the first switching transistor Q1 and the second switching transistor Q2 are NPN transistors.

[0155] Optionally, the timer S can be a 555 timer or any other possible timer, and this application embodiment does not limit this.

[0156] Specifically, the discharge pin of timer S, namely the DIS pin (also known as the DISCH pin) of timer S, can be pulled low when overcurrent protection is activated, and pulled high when overcurrent protection is deactivated.

[0157] And above Figure 4 In this context, DISCH refers to the high or low level of the discharge pin of timer S.

[0158] In other words, this discharge pin can be used as the output terminal of the protection unit 1033, and the high or low level of this discharge pin is determined by the state of the IGBT. When the IGBT is normal, DISCH is 1. The state of DISCH, in turn, affects the high or low level of the aforementioned feedback signal.

[0159] In one possible implementation, see [link to previous section] Figure 8 The first capacitor adjustment unit J1 includes a first switch K1 and a third capacitor C3.

[0160] The control end of the first switch K1 is connected with the control end of the control unit 101, and the first switch K1 and the third capacitor C3 are connected between the first plate and the second plate of the first capacitor C1.

[0161] The first switch K1 is used to be turned off when the driving logic is two-level driving logic, and the first switch K1 is used to be turned on when the driving logic is three-level driving logic.

[0162] In one possible mode, continuing to refer to Figure 8 , the second capacitor adjustment unit J2 includes the second switch K2 and the fourth capacitor C4, the control end of the second switch K2 is connected with the control end of the control unit 101, and the second switch K2 and the fourth capacitor C4 are connected between the first plate and the second plate of the second capacitor C2.

[0163] The second switch K2 is used to be turned off when the driving logic is two-level driving logic, and the second switch K2 is used to be turned on when the driving logic is three-level driving logic.

[0164] In addition, as shown in the structure of Figure 8 , the protection unit 1033 can further include a resistor Rc, a resistor Rd, a resistor Re, a resistor Rf, a resistor Rg, a resistor Rh, a resistor Ri, a resistor Rj, a resistor Rk, a capacitor Ce, a capacitor Cf, a diode Da and a diode Db. For specific connection relationship, please refer to Figure 8 , and the embodiments of the present application do not make redundant description here.

[0165] It can be understood that when the output pin (O pin) of the timer S outputs a high level, the first switch tube Q1 is turned on, the emitter of the first switch tube Q1 outputs a high level to charge the first capacitor C1, and the trigger pin (TR pin) of the timer S is powered (which can be a voltage of 14.08V), when the circuit 100 is protected, the first capacitor C1 is discharged through the resistor Re, and the voltage of the trigger pin of the timer S continuously decreases.

[0166] When the control unit 101 controls the first switch K1 to be closed to connect the third capacitor C3 to the protection unit 1033, the third capacitor C3 and the first capacitor C1 are connected in parallel, at this time, the size of the discharge time is determined by the third capacitor C3 and the first capacitor C1 together. If the first switch K1 is turned off, at this time, the size of the discharge time is determined by the first capacitor C1.

[0167] Exemplarily, the discharge time: T = RCln(U0 / U C ). Wherein, U0 is the voltage of the TR pin after discharge, U C is the power voltage (i.e. the second working voltage).

[0168] The charging time: Where U1 is the initial voltage and U2 is the voltage value after charging (equal to the voltage value at the threshold level).

[0169]

[0170] Furthermore, as can be seen from the above formula, the protection unit 1033 is... Figure 8 The voltage at point P, i.e., the voltage of the threshold voltage (THR) pin of timer S, is compared with the reference voltage of the comparator voltage (CV) pin of timer S. Overcurrent protection occurs when the voltage of THR is greater than the voltage of CV. The time taken for this process is the time it takes for the voltage of the second capacitor C2 to rise from voltage U1 to voltage U2. Therefore, to ensure that the three-level drive logic turns off the outer transistor first and then the inner transistor, the turn-off time of the inner transistor must be delayed by more than one switching time Toff compared to the outer transistor. This can be achieved by increasing the resistance value of resistor Rk and the capacitance value of the second capacitor C2. Therefore, when the second switch K2 is turned on, connecting the fourth capacitor C4 in parallel with the second capacitor C2 can achieve the above function.

[0171] In one possible implementation, see [link to relevant documentation]. Figure 9 The protection unit 1033 also includes a third switch Q3 and a first diode D1.

[0172] The first terminal of the third switch Q3 is connected to the output pin of the timer S and the second terminal of the first switch Q1, respectively. The second terminal of the third switch Q3 is connected to the reset pin of the timer S. The second terminal of the third switch Q3 is also connected to the third terminal of the third switch Q3 through the first diode D0. The third terminal of the third switch Q3 is also used to input the second operating voltage.

[0173] Optionally, the third switch Q3 is a PNP type switch.

[0174] It is worth noting that, for example, when the output pin (pin 0) of timer S outputs a high level of +15V, since the third switching transistor Q3 is a PNP type switching transistor, the reset pin of timer S ( Figure 9 The power supply requirement for the RS pin of the timer S is above 5V. Therefore, when the base of the third switch Q3 is powered by a 5.6V Zener diode, the emitter potential of the third switch Q3 is around 6.1V, and the third switch Q3 operates in a switching state. When the third switch Q3 is turned on, the voltage on the collector of the third switch Q3 supplies power to the reset pin (RS) of the timer S. Furthermore, connecting the emitter of the third switch Q3 to the output pin of the timer S ensures sufficient emitter current when the third switch Q3 is turned on.

[0175] This ensures that the protection unit 1033 can work normally, improving the practicality and reliability of the circuit 100.

[0176] The electronic device can include the drive circuit 100 provided by any of the above embodiments.

[0177] Optionally, the electronic device can further include one or more IGBTs to be driven. The IGBTs in the electronic device can be arranged in an energy storage converter, a frequency converter, or the like, which is not limited in the embodiments of the present application.

[0178] It can be understood that the electronic device provided by the embodiments of the present application can further include any other possible device to achieve corresponding functions, which is not limited in the embodiments of the present application.

[0179] The above is merely specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0180] The above is merely preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be covered in the protection scope of the present application.

Claims

1. A drive circuit characterized by comprising: The circuit comprises at least a control unit, a signal output unit, a drive control unit and a feedback unit; an output end of the control unit is connected with an input end of the signal output unit, an input end of the control unit is connected with an output end of the feedback unit, and a control end of the control unit is connected with a control end of the drive control unit; the feedback unit is configured to output a feedback signal to the control unit based on the drive control unit, the feedback signal being configured to indicate a working state of a to-be-driven switch tube; the control unit is configured to output a pulse width modulation signal to the signal output unit and control the drive control unit to switch a drive logic based on the feedback signal, the drive logic comprising two-level drive logic and three-level drive logic; an output end of the signal output unit is connected with an input end of the drive control unit; the signal output unit is configured to convert the pulse width modulation signal into a target signal and output the target signal to the drive control unit so as to enable the drive control unit; a first output end of the drive control unit is connected with an input end of the feedback unit, and a second output end, a third output end and a fourth output end of the drive control unit are respectively configured to be connected with a gate, an emitter and a collector of the to-be-driven switch tube; the drive control unit is configured to output a drive signal to each pole of the to-be-driven switch tube under the action of the drive logic and the target signal.

2. The drive circuit of claim 1, wherein, The drive control unit comprises a logic gate circuit, a drive unit, a protection unit and at least one capacitor adjustment unit. a first end of the logic gate circuit is connected with an output end of the signal output unit, a second end of the logic gate circuit is connected with an input end of the feedback unit, a third end and a fourth end of the logic gate circuit are respectively connected with a first input end and a second input end of the drive unit, and a fifth end of the logic gate circuit is configured to input a first working voltage; a sixth end of the logic gate circuit is connected with an input end of the protection unit, a power supply end of the protection unit is connected with the fifth end of the logic gate circuit, and a third end and a fourth end of the protection unit and a fifth end and a sixth end of the protection unit are respectively configured to be connected with the capacitor adjustment unit; a first output end and a second output end of the drive unit are respectively configured to be connected with the gate and the emitter of the to-be-driven switch tube, and the third end of the protection unit is further configured to be connected with the collector of the to-be-driven switch tube; and the second output end of the drive unit is further connected with the fourth end of the protection unit; The capacitor adjustment unit is configured to adjust a capacitance value connected with the protection unit under the control of the control unit, so as to adjust an action timing of the protection unit.

3. The drive circuit of claim 2, wherein, The logic gate circuit comprises an exclusive-OR gate circuit and an AND gate circuit. The input end of the XOR gate circuit is connected with the output end of the signal output unit, the power supply end, the first input end and the second input end of the XOR gate circuit are used for inputting the first working voltage respectively, the first output end of the XOR gate circuit is connected with the third input end of the XOR gate circuit, the first input end of the AND gate circuit and the first input end of the driving unit respectively, and the second output end of the XOR gate circuit is connected with the fourth input end of the XOR gate circuit and the second input end of the driving unit respectively. The fifth input end and the sixth input end of the XOR gate circuit are connected with the first output end and the second output end of the AND gate circuit respectively, and the third output end and the fourth output end of the XOR gate circuit are connected with the second input end and the third input end of the AND gate circuit respectively. The power supply end, the fourth input end, the fifth input end, the sixth input end and the seventh input end of the AND gate circuit are used for inputting the first working voltage respectively, and the third output end of the AND gate circuit is connected with the input end of the feedback unit.

4. The drive circuit of claim 2, wherein The feedback unit comprises a first isolation device. The first input end of the first isolation device is used for inputting the first working voltage, the second input end of the first isolation device is used for connecting the second end of the logic gate circuit, the first output end of the first isolation device is used for connecting the second working voltage, and the second output end of the first isolation device is connected with the input end of the control unit.

5. The drive circuit of claim 2, wherein, The driving unit comprises a switch tube driver and a push-pull unit. The first input end and the second input end of the switch tube driver are connected with the third end and the fourth end of the logic gate circuit respectively, the first output end and the second output end of the switch tube driver are connected with the first control end and the second control end of the push-pull unit respectively, and the power supply end of the switch tube driver is used for inputting the second working voltage. The power supply end of the push-pull unit is used for inputting the third working voltage, the first output end and the second output end of the push-pull unit are used for connecting the gate and the emitter of the switch tube to be driven respectively, and the second output end of the push-pull unit is also connected with the fourth end of the protection unit. The push-pull unit is used for outputting a driving voltage to the gate and the emitter of the switch tube to be driven under the action of the driving signal output by the switch tube driver.

6. The drive circuit of claim 2, wherein, The protection unit further comprises a timer, a first switch tube, a second switch tube, a first capacitor and a second capacitor, and the capacitor adjustment unit comprises a first capacitor adjustment unit and a second capacitor adjustment unit. The power supply pin of the timer is connected with the ground pin of the timer, the first plate of the first capacitor and the first end of the first capacitor adjustment unit respectively, the discharge pin of the timer is connected with the second plate of the first capacitor, the trigger pin of the timer is connected with the second plate of the first capacitor, the second end of the capacitor adjustment unit and the first pole of the first switch tube respectively, the output pin of the timer is connected with the second pole of the first switch tube, and the threshold value pin of the timer is connected with the first pole of the second switch tube, the first plate of the second capacitor and the first end of the second capacitor adjustment unit respectively. The comparison pin of the timer is connected with the second output end of the driving unit, and the power pin of the timer and the third pole of the first switch tube are respectively used for inputting the second working voltage; The second pole of the second switch tube is connected with the sixth end of the logic gate circuit, the third pole of the second switch tube is connected with the second pole of the second switch tube, and the third pole of the second switch tube is grounded.

7. The drive circuit of claim 6, wherein, The first capacitor adjusting unit comprises a first switch and a third capacitor; the control end of the first switch is connected with the control end of the control unit, and the first switch and the third capacitor are connected between the first pole plate and the second pole plate of the first capacitor; The first switch is used for being turned off when the driving logic is two-level driving logic, and the first switch is used for being turned on when the driving logic is three-level driving logic. The second capacitor adjusting unit comprises a second switch and a fourth capacitor; the control end of the second switch is connected with the control end of the control unit, and the second switch and the fourth capacitor are connected between the first pole plate and the second pole plate of the second capacitor; The second switch is used for being turned off when the driving logic is two-level driving logic, and the second switch is used for being turned on when the driving logic is three-level driving logic.

8. The drive circuit of claim 6, wherein, The protection unit further comprises a third switch tube and a first diode; The first pole of the third switch tube is connected with the output pin of the timer and the second pole of the first switch tube respectively, the second pole of the third switch tube is connected with the reset pin of the timer, and the second pole of the third switch tube is further connected with the third pole of the third switch tube through the first diode, and the third pole of the third switch tube is further used for inputting the second working voltage.

9. The drive circuit of any one of claims 1-8, wherein, The signal output unit comprises a second isolation device; The first input end of the second isolation device is connected with the output end of the control unit, the second input end of the second isolation device is grounded, the first output end of the second isolation device is used for inputting the first working voltage, the second output end of the second isolation device is connected with the input end of the driving control unit, and the third output end of the second isolation device is grounded.

10. An electronic device, comprising: The electronic device comprises a plurality of driving circuits according to any one of claims 1 to 9.

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