Driving circuit and electronic device

Abstract

The invention 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 field of electronic technology, and in particular to a driving circuit and an electronic device. Background Art

[0002] With the rapid development of electronic technology, insulated gate bipolar transistors (IGBTs) have been widely used. IGBTs have the advantages of low driving power and low saturation voltage drop, so they are widely used in inverters, energy storage converters and other equipment.

[0003] In the related art, the common solution for driving IGBT is to apply positive and negative voltages to the gate of IGBT for power supply and keep the source of IGBT grounded. Specifically, when the IGBT needs to be turned on, a +15V positive voltage can be applied to the gate of the IGBT for power supply; 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 technical solution is generally only applicable to circuits of one topology and is difficult to be applied to main power circuits or devices of different topologies. Therefore, the related technology has the problems of a small scope of application and poor practicality. Summary 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 with different topological structures, so as to improve the application scope and practicality of the driving circuit.

[0006] The embodiment of the present application is implemented as follows:

[0007] In a first aspect of an embodiment of the present application, a driving circuit is provided, the circuit comprising at least: 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 drive control unit; the feedback unit is used to output a feedback signal to the control unit based on the drive control unit, and the feedback signal is used to indicate the working state of the switch tube to be driven; the control unit is used to output a pulse width modulation signal to the signal output unit, and control the drive control unit to switch the drive logic based on the feedback signal, and the drive logic includes a two-level drive logic and a three-level drive logic;

[0009] The output end of the signal output unit is connected to the input end of the drive control unit; the signal output unit is used to convert the pulse width modulation signal into a target signal and output the target signal to the drive control unit to enable the drive control unit;

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

[0011] Optionally, the driving control unit includes: a logic gate circuit, a driving unit, a protection unit, and at least one capacitance adjustment unit;

[0012] The first end of the logic gate circuit is connected to the output end of the signal output unit, the second end of the logic gate circuit is connected to the input end of the feedback unit, the third end and the fourth end of the logic gate circuit are connected to the first input end and the second input end of the driving unit respectively, and the fifth end of the logic gate circuit is used to input the first working voltage;

[0013] The sixth end of the logic gate circuit is connected to the input end of the protection unit, the power supply end of the protection unit is used to input the first working voltage, and the third and fourth ends of the protection unit and the fifth and sixth ends of the protection unit are respectively used to connect the capacitance adjustment unit;.

[0014] The first output terminal and the second output terminal of the driving unit are respectively used to connect the gate and the emitter of the switch tube to be driven, and the third terminal of the protection unit is also used to connect the collector of the switch tube to be driven; and the second output terminal of the driving unit is also connected to the fourth terminal of the protection unit;

[0015] The capacitance adjustment unit is used to adjust the capacitance value connected to the protection unit under the control of the control unit to adjust the action timing of the protection unit.

[0016] Optionally, the logic gate circuit includes: an XOR gate circuit and an AND gate circuit;

[0017] The input end of the XOR gate circuit is connected to 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 to input the first working voltage, the first output end of the XOR gate circuit is respectively connected to 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 to the fourth input end of the XOR gate circuit and the second input end of the driving unit;

[0018] The fifth input terminal and the sixth input terminal of the XOR gate circuit are connected to the first output terminal and the second output terminal of the AND gate circuit respectively, and the third output terminal and the fourth output terminal of the XOR gate circuit are connected to the second input terminal and the third input terminal of the AND gate circuit respectively;

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

[0020] Optionally, the feedback unit includes: a first isolation device;

[0021] The first input end of the first isolation device is used to input a first operating voltage, the second input end of the first isolation device is used to connect to the second end of the logic gate circuit, the first output end of the first isolation device is used to connect to a second operating voltage, and the second output end of the first isolation device is connected to the input end of the control unit.

[0022] Optionally, the driving unit includes: a switch tube driver and a push-pull unit;

[0023] The first input terminal and the second input terminal of the switch tube driver are respectively connected to the third terminal and the fourth terminal of the logic gate circuit, the first output terminal and the second output terminal of the switch tube driver are respectively connected to the first control terminal and the second control terminal of the push-pull unit, and the power supply terminal of the switch tube driver is used to input a second working voltage;

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

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

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

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

[0028] The comparison pin of the timer is connected to the second output terminal of the driving unit, and the power pin of the timer and the third electrode of the first switch tube are respectively used to input the second working voltage;

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

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

[0031] Wherein, the first switch is used to be disconnected when the driving logic is a two-level driving logic, and the first switch is used to be turned on when the driving logic is a three-level driving logic;

[0032] The second capacitance adjustment unit includes a second switch and a fourth capacitor; the control end of the second switch is connected to 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 to be disconnected when the driving logic is a two-level driving logic, and the second switch is used to be turned on when the driving logic is a three-level driving logic.

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

[0035] The first pole of the third switch tube is respectively connected to the output pin of the timer and the second pole of the first switch tube, the second pole of the third switch tube is connected to the reset pin of the timer, and the second pole of the third switch tube is also connected to the third pole of the third switch tube through the first diode, and the third pole of the third switch tube is also used to input the second working voltage.

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

[0037] The first input terminal of the second isolation device is connected to the output terminal of the control unit, the second input terminal of the second isolation device is grounded, the first output terminal of the second isolation device is used to input a first operating voltage, the second output terminal of the second isolation device is connected to the input terminal of the driving control unit, and the third output terminal of the second isolation device is grounded.

[0038] According to a second aspect of the embodiments of the present application, an electronic device is provided, comprising a plurality of any one of the driving circuits provided in the first aspect.

[0039] The beneficial effects of the embodiments of the present application include:

[0040] The embodiment of the present application provides a driving circuit, in which a control unit, a signal output unit, a driving control unit, and a feedback unit are arranged. Specifically, 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 output end of the signal output unit is connected to the input end of the driving control unit.

[0041] The first output terminal of the driving control unit is connected to the input terminal of the feedback unit, and the second output terminal, the third output terminal and the fourth output terminal of the driving control unit are respectively used to connect the gate, the emitter and the collector of the switch tube to be driven.

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

[0043] In this way, the driving circuit can be adapted to circuits with different topological structures, thereby improving the applicable scope and practicality of the driving circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the structure of a first driving circuit provided in an embodiment of the present application;

[0046] Figure 2 A schematic diagram of the structure of a second driving circuit provided in an embodiment of the present application;

[0047] Figure 3 A schematic diagram of the structure of a third driving circuit provided in an embodiment of the present application;

[0048] Figure 4 A schematic diagram of a driving logic provided in an embodiment of the present application;

[0049] Figure 5 A schematic diagram of the structure of a fourth driving circuit provided in an embodiment of the present application;

[0050] Figure 6 A schematic diagram of the structure of a fifth driving circuit provided in an embodiment of the present application;

[0051] Figure 7 A schematic diagram of the structure of a sixth driving circuit provided in an embodiment of the present application;

[0052] Figure 8 A schematic diagram of the structure of a seventh driving circuit provided in an embodiment of the present application;

[0053] Fig. 9 A schematic diagram of the structure of an eighth driving circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than 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 present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0056] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

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

[0058] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] The common solution for driving IGBT is to apply positive and negative voltages to the gate of IGBT for power supply, and keep the source of IGBT grounded. Specifically, when the IGBT needs to be turned on, a +15V positive voltage can be applied to the gate of the IGBT for power supply; when the IGBT needs to be turned off, a negative voltage of about -10V can be applied to the gate of the IGBT.

[0060] However, the driving logic of the related technical solution is generally only applicable to circuits of one topology and is difficult to be applied to main power circuits or devices of different topologies. Therefore, the related technology has the problems of a small scope of application and poor practicality.

[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, and a feedback unit in the driving circuit. 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 output end of the signal output unit is connected to the input end of the driving control unit; the first output end of the driving control unit is connected to the input end of the feedback unit, and the second output end, the third output end and the fourth output end of the driving control unit are respectively used to connect the gate, the emitter and the collector of the switch tube to be driven; the driving control unit is used to output a driving signal to each pole of the switch tube to be driven under the action of the driving logic and the target signal. In this way, the driving circuit can be applied to circuits of different topological structures to improve the scope of application and practicality of the driving circuit.

[0062] The embodiments of the present application are described by taking a driving circuit used in an electronic device for driving an IGBT as an example, but this does not mean that the embodiments of the present application can only be used to drive an IGBT.

[0063] Optionally, the electronic device may be any device that may include an IGBT, such as an energy storage converter, a frequency converter, or a DC-DC converter, and the embodiments of the present application are not limited to this.

[0064] The driving circuit provided in the embodiment of the present application is explained in detail below.

[0065] Figure 1 This is a schematic diagram of the structure of a driving circuit provided by the present application. Figure 1 An embodiment of the present application provides a driving circuit, and the driving circuit 100 includes: 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 to the input end of the signal output unit 102 , the input end of the control unit 101 is connected to the output end of the feedback unit 104 , and the control end of the control unit 101 is connected to the control end of the driving control unit 103 .

[0067] An output terminal of the signal output unit 102 is connected to an input terminal of the driving control unit 103 .

[0068] The first output terminal of the driving control unit 103 is connected to the input terminal of the feedback unit 104 , and the second output terminal, the third output terminal and the fourth output terminal of the driving control unit 103 are respectively used to connect the gate, the emitter and the collector of the switch tube to be driven.

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

[0070] The control unit 101 is used 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 used to convert the pulse width modulation signal into a target signal and output the target signal to the driving control unit 103 to enable the driving control unit 103 .

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

[0073] Optionally, the control unit 101 may be any element having functions such as processing, controlling, identifying, and judging, and the control unit 101 may include one processing element or multiple processing elements. For example, the control unit 101 may 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 the functions of signal isolation and power isolation. Specifically, the isolation function of the signal output unit 102 can be achieved through optocoupler isolation, pulse transformer isolation, and optical fiber isolation, so as to ensure the separation of the high-voltage domain and the low-voltage domain in the circuit 100, thereby avoiding damage to components in the circuit 100.

[0075] It can be seen that the signal output unit 102 can be specifically used to convert the voltage level, current size and other parameters 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 may specifically detect and / or determine the working state of the switch tube to be driven 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 switch tube to be driven.

[0077] The working state may include a state in which the switch to be driven is working normally and a state in which the switch to be driven is faulty. The state in which the switch to be driven is faulty may be caused by overcurrent protection of the switch to be driven or by hardware failure of the switch to be driven itself, which is not limited in the embodiments of the present application.

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

[0079] Furthermore, the feedback unit 104 may also have the functions of signal isolation and power isolation. Specifically, the isolation function of the feedback unit 104 may be realized by means of optical coupler isolation, pulse transformer isolation, and optical fiber isolation, so as to ensure the separation of the high-voltage domain and the low-voltage domain in the circuit 100, thereby avoiding damage to components in the circuit 100.

[0080] Optionally, the switch tube to be driven may be an IGBT in any device or any other device that may need to be driven by voltage, which is not limited in the embodiment of the present application.

[0081] For example, see Figure 1 If the switch to be driven is an IGBT, then the gate, emitter and collector of the switch to be driven can refer to Figure 1 The G, E and C poles of the IGBT are shown.

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

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

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

[0085] Exemplarily, if a plurality of circuits 100 are provided in the electronic device, the type of the power main topology of the electronic device can be determined by specifically 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 set in the electronic device for driving. In this case, when detecting the main power topology of the frequency converter, only the feedback signals of the two IGBT tubes in any bridge arm of the frequency converter are high level and the other feedback signals are low level, and the control unit 101 can determine that the electronic device needs to adopt a 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 used as outer tubes and the other two IGBTs are used as inner tubes, and multiple circuits 100 can be set in the electronic device for driving. In this case, the feedback signals of the four IGBT tubes in any bridge arm of the energy storage converter are high level, and the feedback signals corresponding to each circuit 100 can indicate that the electronic device needs to adopt a three-level driving logic.

[0088] It can be understood that since the three-level main power topology must turn off the outer tube first and then the inner tube when turning off the tube, otherwise the IGBT may be damaged. Therefore, the three-level drive 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 shutting down the tube, so the two-level driving logic can only have the functions of IGBT hardware overcurrent protection and software overcurrent protection.

[0090] That is to say, the drive control unit 103 can at least have the functions of IGBT hardware overcurrent protection and software overcurrent protection, and can also have the function of IGBT switch timing protection when the drive control unit 103 is switched to a three-level drive logic. These functions can be implemented by writing corresponding programs into the processing device in the drive control unit 103 and / or by adopting corresponding circuit structures, and the embodiments of the present application do not limit this.

[0091] In this embodiment, when the control unit 101 controls the driving control unit 103 to switch the driving logic, the driving control unit 103 can specifically turn on or off the IGBT switch tube timing protection by changing the size of the capacitor inside the driving control unit 103. In this way, the driving control unit 103 can also switch between the three-level driving logic and the two-level driving logic.

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

[0093] Optionally, the driving control unit 103 can specifically 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 overcurrent protection, IGBT hardware overcurrent protection, and / or IGBT switch tube timing protection on the switch tube to be driven under the action of the driving logic.

[0094] It is worth noting that when the circuit 100 provided in this embodiment is applied to the corresponding electronic device to drive each IGBT, the control unit 101 can output the 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 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 to be used according to the feedback signal. Then, according to the feedback signal, the drive control unit 103 is controlled to switch to a two-level drive logic or a three-level drive logic, so that the drive control unit 103 can drive the device of the two-level main power topology or the three-level main power topology respectively.

[0095] In this way, the driving circuit 100 can be applied to circuits with different topological structures, so as to improve the application range and practicality of the driving circuit 100.

[0096] In the embodiment of the present application, a control unit 101, a signal output unit 102, a driving control unit 103, and a feedback unit 104 are provided in the driving circuit 100. Specifically, the output end of the control unit 101 is connected to the input end of the signal output unit 102, the input end of the control unit 101 is connected to the output end of the feedback unit 104, and the control end of the control unit 101 is connected to the control end of the driving control unit 103. The output end of the signal output unit 102 is connected to the input end of the driving control unit 103.

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

[0098] 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 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 to be used according to the feedback signal. Then, according to the feedback signal, the drive control unit 103 is controlled to switch to a two-level driving logic or a three-level driving logic, so that the drive control unit 103 can drive the device of the two-level main power topology or the three-level main power topology respectively.

[0099] In this way, the driving circuit 100 can be applied to circuits with different topological structures, so as to improve the application range and practicality of the driving circuit 100.

[0100] In addition, since the driving control unit 103 can also provide software overcurrent protection, IGBT hardware overcurrent protection, and / or IGBT switch tube timing protection for the switch tube to be driven, this can also prevent the switch tube to be driven from being damaged due to overcurrent problems and / or shutdown timing errors, thereby improving the safety and reliability of the driving circuit 100.

[0101] For a possible implementation, see Figure 2 The driving control unit 103 includes: a logic gate circuit 1031, a driving unit 1032, a protection unit 1033, and at least one capacitance adjustment unit 1034.

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

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

[0104] The first output terminal and the second output terminal of the driving unit 1032 are respectively used to connect the gate and the emitter of the switch tube to be driven, and the third terminal of the protection unit 1033 is also used to connect the collector of the switch tube to be driven; and the second output terminal of the driving unit 1032 is also connected to the fourth terminal of the protection unit 1033.

[0105] The capacitance adjustment unit 1034 is used to adjust the capacitance value of the access protection unit 1033 under the control of the control unit 101 to adjust the action timing of the protection unit 1033 .

[0106] Generally, if the capacitance value connected to the protection unit 1033 is larger, the timing of the protection unit 1033 will be delayed, that is, the time when the protection unit 1033 turns off the switch to be driven will be later.

[0107] Optionally, the logic gate circuit 1031 may include any possible logic gate elements such as an AND gate, a NOT gate, an XOR gate, etc., which is not limited in the embodiment of the present application.

[0108] Specifically, the logic gate circuit 1031 can be used to generate the above-mentioned indication signal according to the working state of the switch tube to be driven and output it to the feedback unit 104, and can also be used to control the driving 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 shutting down the switch tube to be driven, and specifically can shut down the switch tube to be driven in the case of overcurrent, etc. The protection unit 1033 can include corresponding switch tubes, processing units and other devices, which are not limited in the embodiment of the present application.

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

[0111] Optionally, the capacitance adjustment unit 1034 may specifically include a corresponding capacitor, and when necessary, the capacitor in the capacitance adjustment unit 1034 may be connected in parallel or in series to the circuit of the protection unit 1033 to change the capacitance value of the protection unit 1033. This embodiment of the application is not limited to this.

[0112] Optionally, the first operating voltage (VDD1 as shown in the figure) can be a voltage of any voltage level, such as 5V, and can be specifically selected according to the parameters of each component in the driving control unit 103, which is not limited in the embodiment of the present application.

[0113] Exemplarily, since the second output terminal of the driving unit 1032 is also connected to the fourth terminal of the protection unit 1033, the driving voltage output by the driving 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 use the driving voltage output by the driving unit 1032 to the emitter E of the switch tube to be driven as a reference voltage, and determine whether overcurrent protection is required according to the reference voltage.

[0114] Specifically, when the reference voltage is less than the voltage of the driving signal output by the protection unit 1033 to the collector of the switch tube to be driven, it can be determined that overcurrent protection is required. When the reference voltage is greater than or equal to the voltage of the driving signal output by the protection unit 1033 to the collector of the switch tube to be driven, it can be determined that overcurrent protection is not required. This embodiment of the application is not limited to 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 action timing of the protection unit 1033 can be adjusted by changing the capacitance value of the protection unit 1033, so that the shutdown time of the switch tube to be driven is delayed.

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

[0117] For a possible implementation, see Figure 3 , the logic gate circuit 1031 includes: an XOR gate circuit U1 and an AND gate circuit U2.

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

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

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

[0121] Optionally, the first operating voltage may be input to the fifth input terminal of the AND gate circuit U2 through a resistor Ra. The resistor Ra may be used for current limiting and / or voltage division.

[0122] Furthermore, the logic gate circuit 1031 may further include a capacitor Ca and a capacitor Cb as filter capacitors for inputting the first operating voltage.

[0123] For example, in Figure 3 Based on Figure 4 , the driving logic provided in the embodiment of the present application is as follows Figure 4 As shown, 0 represents a low level and 1 represents a high level. The DISCH signal is a variable level. Under normal circumstances, the input is a high level. When the circuit 100 is under overvoltage protection, the input port signal is pulled down and becomes a low level.

[0124] and, Figure 4 The MOSA in the above-mentioned driving unit 1032 outputs the above-mentioned feedback signal ( Figure 4 The optocoupler of the ST signal in the above-mentioned feedback unit 104 is input with the pulse width modulation signal ( Figure 4 The optocoupler of PWM in the signal output refers to the above-mentioned signal output unit 102.

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

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

[0127] Therefore, when DISCH=1, the feedback signal output is 1, which indicates that the drive circuit 100 is in a normal working state. In this 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, MOSA outputs 0, and the IGBT is in the off state.

[0128] In this way, a feedback signal (and / or an 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 can be used to drive the switch tube to be driven.

[0129] For a possible implementation, see Figure 5 , the feedback unit 104 includes: a first isolation device A1.

[0130] The first input terminal of the first isolation device A1 is used to input a first operating voltage, the second input terminal of the first isolation device A1 is used to connect to the second terminal of the logic gate circuit 1031, the first output terminal of the first isolation device A1 is used to connect to the second operating voltage, and the second output terminal of the first isolation device A1 is connected to the input terminal of the control unit 101.

[0131] Optionally, the second operating voltage may be Figure 5 As shown in VDD2, the voltage level of the second operating voltage may be higher than the voltage level of the first operating voltage. For example, the second operating voltage may be 15V, or any other possible level, which is not limited in the present embodiment.

[0132] Optionally, the first isolation device A1 is used to achieve high and low voltage isolation, so that the feedback unit 104 has the functions of signal isolation and power isolation to avoid damage to components in the circuit 100 .

[0133] For example, see Figure 5 The feedback unit 104 may further include a resistor Rb connected between the first input terminal and the second input terminal of the first isolation device A1, and a capacitor Cc connected between the first output terminal and the second output terminal of the first isolation device A1.

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

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

[0136] The first input terminal of the second isolation device A2 is connected to the output terminal of the control unit 101, the second input terminal of the second isolation device A2 is grounded, the first output terminal of the second isolation device A2 is used to input the first working voltage, the second output terminal of the second isolation device A2 is connected to the input terminal of the driving control unit 103, and the third output terminal of the second isolation device A2 is grounded.

[0137] Optionally, the second isolation device A2 is used to achieve high and low voltage isolation, so that the signal output unit 102 has the functions of signal isolation and power isolation to avoid damage to components in the circuit 100.

[0138] For example, see Figure 6 The signal output unit 102 may further include a resistor Rx connected to the second input terminal of the second isolation device A2, a resistor Ry connected between the first input terminal and the second input terminal of the second isolation device A2, a resistor Rz connected to the second output terminal of the second isolation device A2, and a capacitor Cq connected between the first output terminal and the third output terminal of the second isolation device A2. The resistors and capacitors are respectively used to realize functions such as voltage division, current limiting, and filtering.

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

[0140] For a possible implementation, see Figure 7 The driving unit 1032 includes: a switch tube driver K and a push-pull unit T.

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

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

[0143] The push-pull unit T is used to output a driving voltage to the gate and 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 operating voltage may be a voltage of any possible level, and the third operating voltage may be the same voltage as the first operating voltage or the second operating voltage. The specific selection may be made according to actual needs, and the embodiment of the present application does not limit this.

[0145] Optionally, the switch driver K can be Figure 4 The MOSA shown in FIG. 1 is specifically used 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 driver chip, which is not limited in the embodiment of the present application.

[0146] Optionally, the push-pull unit T can be constructed by a PNP transistor and an NPN transistor. The main function is to amplify the current in order to provide a sufficiently large driving current for the switch tube to be driven. In this application, two similar structures are connected in parallel to provide a sufficiently large peak driving current. After the parallel output passes through a driving resistor used to limit the amplitude of the driving peak current, it is used to drive the IGBT. When the resistance value of the driving resistor is small, the driving current may oscillate. If the driving resistor is too small, it will also affect the electromagnetic compatibility (EMC) effect.

[0147] Specifically, see Figure 7 The push-pull unit T may include transistor Qa, transistor Qb, transistor Qc, transistor Qd, and capacitor Cd. For a specific connection structure, see Figure 6 As shown, the embodiments of the present application are not described in detail here.

[0148] It should be noted that the push-pull unit T used in the embodiment of the present application generates two +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 added to the gate and 0V pulse is added to the source; when the switch tube to be driven needs to be turned off, 0V is added to the gate and +15V pulse is added 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 embodiment of the present application can also select a push-pull drive chip with a power isolation function as the push-pull unit T, such as a push-pull drive chip of model UCC2808. Only one resistor and capacitor are needed to set the operating frequency of the push-pull drive chip, and two complementary pulses can be output simultaneously.

[0150] For a possible implementation, see 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 capacitance adjustment unit 1034 includes a first capacitance adjustment unit J1 and a second capacitance adjustment unit J2.

[0151] The power supply pin of the timer S ( Figure 8 V+ in the timer) and the ground pin ( Figure 8 The first plate of the first capacitor C1 is connected to the first end of the first capacitor adjustment unit J1, and the discharge pin ( Figure 8 DIS in the figure) is used to input the first working voltage (can be connected to the fifth terminal of the logic gate circuit 1031 to input the first working voltage), the trigger pin of the timer S ( Figure 8 The output pin (TR) of the timer S is connected to the second plate of the first capacitor C1, the second end of the capacitor adjustment unit 1034 and the first electrode of the first switch tube Q1 respectively. Figure 8 The O in the figure is connected to the second electrode of the first switch tube Q1, and the threshold pin ( Figure 8 The THR in the capacitor is respectively connected to the first electrode of the second switch tube Q2, the first electrode 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 figure is connected to the second output terminal of the driving unit 1032, and the power pin of the timer S and the third electrode of the first switch tube Q1 are respectively used to input the second working voltage.

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

[0154] Optionally, the first switch tube Q1 and the second switch tube Q2 are NPN transistors.

[0155] Optionally, timer S may be a 555 timer or any other possible timer, which is not limited in the embodiment of the present application.

[0156] Specifically, the discharge pin of the timer S, that is, the DIS pin (also called the DISCH pin) of the timer S, can pull the level of this pin down when overcurrent protection is performed, and can pull the level of this pin up when the overcurrent protection is triggered.

[0157] And on Figure 4 The DISCH here refers to the level of the discharge pin of the timer S.

[0158] That is to say, the discharge pin can be used as the output terminal of the protection unit 1033, and the level of the discharge pin is determined by the state of the IGBT. When the IGBT is normal, DISCH is 1. The state of DISCH will affect the level of the above feedback signal.

[0159] In a possible implementation, see Figure 8 , the first capacitance adjustment unit J1 includes a first switch K1 and a third capacitor C3.

[0160] The control end of the first switch K1 is connected to 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 disconnected when the driving logic is a two-level driving logic, and the first switch K1 is used to be turned on when the driving logic is a three-level driving logic.

[0162] In one possible approach, see Figure 8 The second capacitance adjustment unit J2 includes a second switch K2 and a fourth capacitor C4, the control end of the second switch K2 is connected to 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 disconnected when the driving logic is a two-level driving logic, and the second switch K2 is used to be turned on when the driving logic is a three-level driving logic.

[0164] In addition, from Figure 8 As can be seen from the structure shown, the protection unit 1033 may also 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 relationships, see Figure 8 , this embodiment of the present application will not be elaborated on this.

[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, and the emitter of the first switch tube Q1 outputs a high level to charge the first capacitor C1, and supplies power to the trigger pin (TR pin) of the timer S (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 continues to decrease.

[0166] When the control unit 101 controls the first switch K1 to close 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 discharge time is determined by the third capacitor C3 and the first capacitor C1. If the first switch K1 is turned off, the discharge time is determined by the first capacitor C1.

[0167] For example, discharge time: T = RCln (U0 / U C ). Among them, U0 is the voltage of TR pin after discharge, U C is the power supply voltage (ie, the second operating voltage).

[0168] Charging time: Among them, U1 is the initial voltage, and U2 is the voltage value after charging (equal to the voltage value of the thres level).

[0169]

[0170] In addition, it can be seen from the above formula that the protection unit 1033 is Figure 8 The voltage at point P shown, i.e., the voltage of the threshold pin (THR) of the timer S, is compared with the value of the reference voltage of the comparison pin (CV) of the timer S. When the voltage of THR is greater than the voltage of CV, overcurrent protection occurs. The time experienced in this process is the time for the voltage of the second capacitor C2 to rise from the voltage U1 to the voltage U2. Therefore, in order to ensure that the three-level drive logic can satisfy the requirement of first turning off the outer tube and then turning off the inner tube when turning off the tube, the turning-off time of the inner tube must be delayed by more than one switch tube time Toff than the outer tube, which can be achieved by increasing the resistance value of the resistor Rk and the capacitance value of the second capacitor C2. Therefore, when the second switch K2 is turned on, the fourth capacitor C4 is connected in parallel to the second capacitor C2 to achieve the above function.

[0171] For a possible implementation, see Fig. 9 , the protection unit 1033 also includes: a third switch tube Q3 and a first diode D1.

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

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

[0174] It is worth noting that, for example, when the output pin (O pin) of the timer S outputs a high level of +15V, since the third switch tube Q3 is a PNP type switch tube, the reset pin ( Fig. 9 The power supply of the RS pin in the timer S is required to be above 5V. Therefore, when the base of the third switch tube Q3 is powered by a 5.6V voltage regulator, the emitter potential of the third switch tube Q3 is about 6.1V. The third switch tube Q3 works in a switching state. When the third switch tube Q3 is turned on, the voltage on the collector of the third switch tube Q3 supplies power to the reset pin (RS) of the timer S. In addition, the emitter of the third switch tube Q3 is connected to the output pin of the timer S in order to provide sufficient emitter current when the third switch tube Q3 is turned on.

[0175] In this way, it is possible to ensure that the protection unit 1033 can work normally, thereby improving the practicality and reliability of the circuit 100.

[0176] An embodiment of the present application further provides an electronic device, which may include any one of the driving circuits 100 provided by a plurality of the above embodiments.

[0177] Optionally, the electronic device may further include one or more IGBTs to be driven. Moreover, each IGBT in the electronic device may be arranged in a device such as an energy storage converter and a frequency converter, which is not limited in the embodiment of the present application.

[0178] It is understandable that the electronic device provided in the embodiment of the present application may also include any other possible devices to achieve corresponding functions, and the embodiment of the present application does not limit this.

[0179] In the several embodiments provided by the present invention, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0180] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0181] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of the methods of various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated: ROM), random access memory (English: Random Access Memory, abbreviated: RAM), disk or optical disk and other media that can store program codes.

[0182] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0183] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A driving circuit, characterized in that: The circuit at least includes: a control unit, a signal output unit, a drive control unit, and a feedback unit; 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 drive control unit; the feedback unit is used to output a feedback signal to the control unit based on the drive control unit, and the feedback signal is used to indicate the working state of the switch tube to be driven; the control unit is used to output a pulse width modulation signal to the signal output unit, and control the drive control unit to switch the drive logic based on the feedback signal, and the drive logic includes a two-level drive logic and a three-level drive logic; The output end of the signal output unit is connected to the input end of the drive control unit; the signal output unit is used to convert the pulse width modulation signal into a target signal and output the target signal to the drive control unit to enable the drive control unit; The first output end of the driving control unit is connected to the input end of the feedback unit, and the second output end, the third output end and the fourth output end of the driving control unit are respectively used to connect the gate, the emitter and the collector of the switching tube to be driven; the driving control unit is used to output driving signals to each pole of the switching tube to be driven under the action of the driving logic and the target signal.

2. The driving circuit according to claim 1, characterized in that: The driving control unit includes: a logic gate circuit, a driving unit, a protection unit, and at least one capacitance adjustment unit; The first end of the logic gate circuit is connected to the output end of the signal output unit, the second end of the logic gate circuit is connected to the input end of the feedback unit, the third end and the fourth end of the logic gate circuit are connected to the first input end and the second input end of the driving unit respectively, and the fifth end of the logic gate circuit is used to input the first working voltage; The sixth end of the logic gate circuit is connected to the input end of the protection unit, the power supply end of the protection unit is connected to the fifth end of the logic gate circuit, 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 used to connect the capacitance adjustment unit; The first output terminal and the second output terminal of the driving unit are respectively used to connect the gate and the emitter of the switch tube to be driven, and the third terminal of the protection unit is also used to connect the collector of the switch tube to be driven; and the second output terminal of the driving unit is also connected to the fourth terminal of the protection unit; The capacitance adjustment unit is used to adjust the capacitance value connected to the protection unit under the control of the control unit to adjust the action timing of the protection unit.

3. The driving circuit according to claim 2, characterized in that: The logic gate circuit includes: an XOR gate circuit and an AND gate circuit; The input end of the XOR gate circuit is connected to 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 to input the first working voltage, the first output end of the XOR gate circuit is respectively connected to 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 to the fourth input end of the XOR gate circuit and the second input end of the driving unit; The fifth input terminal and the sixth input terminal of the XOR gate circuit are connected to the first output terminal and the second output terminal of the AND gate circuit respectively, and the third output terminal and the fourth output terminal of the XOR gate circuit are connected to the second input terminal and the third input terminal of the AND gate circuit respectively; The power supply terminal, the fourth input terminal, the fifth input terminal, the sixth input terminal and the seventh input terminal of the AND gate circuit are respectively used to input the first working voltage, and the third output terminal of the AND gate circuit is connected to the input terminal of the feedback unit.

4. The driving circuit according to claim 2, characterized in that: The feedback unit includes: a first isolation device; The first input end of the first isolation device is used to input a first operating voltage, the second input end of the first isolation device is used to connect to the second end of the logic gate circuit, the first output end of the first isolation device is used to connect to a second operating voltage, and the second output end of the first isolation device is connected to the input end of the control unit.

5. The driving circuit according to claim 2, characterized in that: The driving unit includes: a switch tube driver and a push-pull unit; The first input terminal and the second input terminal of the switch tube driver are respectively connected to the third terminal and the fourth terminal of the logic gate circuit, the first output terminal and the second output terminal of the switch tube driver are respectively connected to the first control terminal and the second control terminal of the push-pull unit, and the power supply terminal of the switch tube driver is used to input a second working voltage; The power supply end of the push-pull unit is used to input a third working voltage, the first output end and the second output end of the push-pull unit are respectively used to connect the gate and the emitter of the switch tube to be driven, and the second output end of the push-pull unit is also connected to the fourth end of the protection unit; Wherein, the push-pull unit is used to output a driving voltage to the gate and emitter of the switch tube to be driven under the action of the driving signal output by the switch tube driver.

6. The driving circuit according to claim 2, characterized in that: The protection unit further includes: a timer, a first switch tube, a second switch tube, a first capacitor, and a second capacitor; the capacitance adjustment unit includes a first capacitance adjustment unit and a second capacitance adjustment unit; The power pin of the timer is respectively connected to the ground pin of the timer, the first plate of the first capacitor and the first end of the first capacitance adjustment unit, the discharge pin of the timer is respectively connected to the first plate of the first capacitor, the second end of the capacitance adjustment unit and the first pole of the first switch tube, the output pin of the timer is connected to the second pole of the first switch tube, and the threshold pin of the timer is respectively connected to the first pole of the second switch tube, the first plate of the second capacitor and the first end of the second capacitance adjustment unit; The comparison pin of the timer is connected to the second output terminal of the driving unit, and the power pin of the timer and the third electrode of the first switch tube are respectively used to input the second working voltage; The second electrode of the second switch tube is connected to the sixth end of the logic gate circuit, the third electrode of the second switch tube is connected to the second electrode of the second switch tube, and the third electrode of the second switch tube is grounded.

7. The driving circuit according to claim 6, characterized in that: The first capacitance adjustment unit includes a first switch and a third capacitor; a control end of the first switch is connected to a control end of the control unit, and the first switch and the third capacitor are connected between a first plate and a second plate of the first capacitor; Wherein, the first switch is used to be disconnected when the driving logic is a two-level driving logic, and the first switch is used to be turned on when the driving logic is a three-level driving logic; The second capacitance adjustment unit includes a second switch and a fourth capacitor; the control end of the second switch is connected to 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; The second switch is used to be disconnected when the driving logic is a two-level driving logic, and the second switch is used to be turned on when the driving logic is a three-level driving logic.

8. The driving circuit according to claim 6, characterized in that: The protection unit further includes: a third switch tube and a first diode; The first pole of the third switch tube is respectively connected to the output pin of the timer and the second pole of the first switch tube, the second pole of the third switch tube is connected to the reset pin of the timer, and the second pole of the third switch tube is also connected to the third pole of the third switch tube through the first diode, and the third pole of the third switch tube is also used to input the second working voltage.

9. The driving circuit according to any one of claims 1 to 8, characterized in that: The signal output unit includes a second isolation device; The first input terminal of the second isolation device is connected to the output terminal of the control unit, the second input terminal of the second isolation device is grounded, the first output terminal of the second isolation device is used to input a first operating voltage, the second output terminal of the second isolation device is connected to the input terminal of the driving control unit, and the third output terminal of the second isolation device is grounded.

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

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