IGBT drive circuit, H-bridge control circuit and defibrillator

Abstract

The invention relates to an IGBT drive circuit, an H-bridge control circuit and a defibrillator. The IGBT driving circuit comprises a light-induced power generation module which is configured to convert a light signal into a charging signal and output the charging signal under the control of an input power generation control signal; and the charging and discharging module is configured to obtain the charging signal output by the light-induced power generation module to perform charging, perform discharging under the control of an input discharging control signal and output a driving signal to conduct the IGBT. According to the IGBT driving circuit, a transformer is not used, and miniaturization of equipment and reduction of production cost are facilitated.

Description

Technical Field

[0001] The present application relates to the technical field of integrated circuits, and in particular to an IGBT drive circuit, an H-bridge control circuit and a defibrillator. Background Art

[0002] At present, the driving circuit of the transformer is generally used to drive the on or off of the upper tube IGBT (insulated gate bipolar transistor) of the H-bridge, so that the H-bridge can switch quickly. And for the low-voltage control circuit of the H-bridge, the driving circuit is high voltage, so the transformer can also be used to isolate the high-voltage and low-voltage circuits. There are many devices that use this transformer-driven H-bridge, such as a defibrillator. The use of the H-bridge can make the defibrillator generate a bidirectional discharge waveform to stimulate the heart first with a current from left to right, and then with a current from right to left.

[0003] However, such transformers are generally large in size and expensive, which is not conducive to reducing production costs and miniaturization of equipment. Therefore, the drive circuit using the transformer needs to be improved. Summary of the invention

[0004] In view of this, the embodiments of the present application provide an IGBT drive circuit, an H-bridge control circuit and a defibrillator to solve at least one problem existing in the background technology.

[0005] In a first aspect, an embodiment of the present application provides an IGBT driving circuit, wherein the IGBT driving circuit comprises:

[0006] A photovoltaic power generation module is configured to convert a light signal into a charging signal and output the charging signal;

[0007] And, a charge and discharge module is configured to obtain a charging signal output by the photovoltaic power generation module to charge, and discharge under the control of an input discharge control signal and output a driving signal to turn on the IGBT.

[0008] In combination with the first aspect, in an optional implementation, the charge and discharge module includes a discharge circuit;

[0009] The discharge circuit is connected between the gate and emitter of the IGBT, and is configured to be turned on under the control of the discharge control signal to connect the gate and emitter of the IGBT and output the drive signal to the gate of the IGBT to turn on the IGBT; or to be turned off under the control of the discharge control signal to control the IGBT to be turned off.

[0010] In combination with the first aspect, in an optional implementation, the discharge circuit includes an energy storage module and an isolation switch module;

[0011] The positive charge and discharge port of the energy storage module is connected to the gate of the IGBT, and the negative charge and discharge port of the energy storage module is connected to the emitter of the IGBT; the isolation switch module is connected in series in a loop connecting the positive charge and discharge port of the energy storage module, the gate of the IGBT, the emitter of the IGBT and the negative charge and discharge port of the energy storage module;

[0012] The isolation switch module is configured to be turned on or off under the control of the discharge control signal to turn on or off the discharge circuit.

[0013] In combination with the first aspect, in an optional implementation, the isolation switch module includes a first photoelectric coupler;

[0014] The positive charge and discharge port of the energy storage module is connected to the gate of the IGBT, the negative charge and discharge port of the energy storage module is connected to the first output end of the first photocoupler, the second output end of the first photocoupler is connected to the emitter of the IGBT, and the input end of the first photocoupler is configured to input the discharge control signal.

[0015] In combination with the first aspect, in an optional implementation manner, the energy storage module includes a first capacitor;

[0016] The first end of the first capacitor serves as a positive charging and discharging port of the energy storage module, and the second end of the first capacitor serves as a negative charging and discharging port of the energy storage module.

[0017] In combination with the first aspect, in an optional implementation manner, the discharge circuit further includes a first resistor;

[0018] A first end of the first resistor is connected to the gate of the IGBT, and a second end of the first resistor is connected to the emitter of the IGBT.

[0019] In combination with the first aspect, in an optional implementation, the isolation switch module includes a second photoelectric coupler;

[0020] The positive charge and discharge port of the energy storage module is connected to the second output end of the second photocoupler, the negative charge and discharge port of the energy storage module is connected to the emitter of the IGBT, the first output end of the second photocoupler is connected to the gate of the IGBT, and the input end of the second photocoupler is configured to input the discharge control signal.

[0021] In combination with the first aspect, in an optional implementation manner, the energy storage module includes a second capacitor;

[0022] The first end of the second capacitor serves as the positive charge and discharge port of the energy storage module, and the second end of the second capacitor serves as the negative charge and discharge port of the energy storage module.

[0023] In combination with the first aspect, in an optional implementation manner, the discharge circuit further includes a third photocoupler;

[0024] The first output terminal of the third photocoupler is connected to the emitter of the IGBT, the second output terminal of the third photocoupler is connected to the gate of the IGBT, and the input terminal of the third photocoupler is configured to input a third control signal.

[0025] In combination with the first aspect, in an optional implementation, the photovoltaic power generation module includes an electro-optical conversion module and a photoelectric conversion module;

[0026] The electro-optical conversion module is configured to convert the input electrical signal into the optical signal and output the optical signal;

[0027] The photoelectric conversion module is configured to obtain the optical signal, convert it into the charging signal, and output it.

[0028] In combination with the first aspect, in an optional implementation, the charging and discharging module further includes a charging circuit;

[0029] The charging circuit is configured to transmit the charging signal output through the positive output terminal and the negative output terminal of the photoelectric conversion module.

[0030] In a second aspect, an embodiment of the present application provides an H-bridge control circuit, comprising four IGBTs constituting an H-bridge and two drive circuits of the above-mentioned IGBTs;

[0031] The first IGBT and the third IGBT are sequentially connected in series between the positive reference voltage terminal and the zero reference voltage terminal, the second IGBT and the fourth IGBT are sequentially connected in series between the positive reference voltage terminal and the zero reference voltage terminal, the series connection point between the first IGBT and the third IGBT serves as the first drive output terminal, and the series connection point between the second IGBT and the fourth IGBT serves as the second drive output terminal;

[0032] The driving circuit of the first IGBT is configured to control the first IGBT to be turned on or off, and the driving circuit of the second IGBT is configured to control the second IGBT to be turned on or off.

[0033] In conjunction with the second aspect, in an optional implementation manner, the operating mode of the H-bridge control circuit includes a first operating mode and a second operating mode;

[0034] In the first working mode, the first IGBT and the fourth IGBT are controlled to be turned on, and the second IGBT and the third IGBT are controlled to be turned off, so that a current signal flowing from the first driving output end to the second driving output end is input to a load connected between the first driving output end and the second driving output end;

[0035] In the second operating mode, the first IGBT and the fourth IGBT are controlled to be turned off, and the second IGBT and the third IGBT are controlled to be turned on, so that the load is fed with a current signal flowing from the second drive output terminal to the first drive output terminal.

[0036] In a third aspect, an embodiment of the present application provides a defibrillator, comprising the above-mentioned H-bridge control circuit.

[0037] The beneficial effects brought about by the technical solution provided in the embodiment of the present application include: by adopting a combination of a photovoltaic power generation module and a charge and discharge module to drive the IGBT to be turned on or off, the use of a transformer is eliminated in the IGBT driving circuit, thereby reducing the volume of the IGBT driving circuit, which is conducive to the miniaturization of the equipment and can also reduce the production cost of the equipment.

[0038] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below and in part will become apparent from the description below or will be learned through the practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application for those skilled in the art by referring to specific embodiments. In the drawings:

[0040] Figure 1 A schematic block diagram of a specific example of an IGBT driving circuit in an embodiment of the present application;

[0041] Figure 2 A schematic block diagram of a specific example of a discharge circuit in an embodiment of the present application;

[0042] Figure 3 A circuit diagram of a specific example of a discharge circuit in an embodiment of the present application;

[0043] Figure 4 A circuit diagram of another specific example of a discharge circuit in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of a specific example of a photovoltaic power generation module in an embodiment of the present application;

[0045] Figure 6 A schematic block diagram of a specific example of an H-bridge control circuit in an embodiment of the present application;

[0046] Figure 7 The schematic diagram is a schematic diagram of a specific example of a defibrillator in an embodiment of the present application. DETAILED DESCRIPTION

[0047] In order to make the technical solutions and beneficial effects of the embodiments of the present application more obvious and easy to understand, the following is a detailed description by listing specific embodiments. Among them, the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meaning as those in the technical field to which the embodiments of the present application belong.

[0048] It should be noted that the terms "first", "second", etc. may be used in this article to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. When describing "first", it does not mean that there must be a "second"; and when discussing "second", it does not mean that there must be a "first" in this application. The singular forms of "one", "an" and "said / the" may also be intended to include plural forms, unless the context clearly indicates otherwise. The term "includes" is to determine the existence of the included features, but does not exclude the existence or addition of one or more other features. The term "and / or" includes any and all combinations of the relevant listed items.

[0049] The embodiment of the present application provides an IGBT driving circuit, which can be applied to an H-bridge control circuit in a defibrillator, a motor drive device, an inverter, and the like. Figure 1 As shown, the IGBT driving circuit 01 includes:

[0050] The photovoltaic power generation module 10 is configured to convert the optical signal into a charging signal and output the charging signal;

[0051] And, the charge-discharge module 20 is configured to obtain the charging signal output by the photovoltaic power generation module to charge, and discharge under the control of the input discharge control signal and output a driving signal to turn on the IGBT.

[0052] In the embodiment of the present application, the energy conversion process in the photovoltaic power generation module 10 can be electric energy-light energy-electric energy, that is, the input electric energy is first converted into light energy, and then the light energy is converted into electric energy and output; it can also be directly converted into electric energy and output, so it can play the role of photoelectric isolation. The photovoltaic power generation module 10 can be converted under the control of the input power generation control signal, or it can be converted and output electric energy without the control of the power generation control signal in the presence of light. For example, in the H-bridge control circuit, for the upper tube IGBT that constitutes the H-bridge, the voltage value of the reference ground connected to its emitter is a relative voltage value. For example, in the H-bridge control circuit used by the defibrillator, the relative voltage value of the reference ground of the upper tube IGBT may reach the kilovolt level. Therefore, when driving the upper tube IGBT to turn on, it is necessary to provide a voltage greater than the relative voltage value (kilovolt-level high voltage) to the gate of the upper tube IGBT. For example, if the reference ground of the upper tube IGBT is 1500V, it is necessary to provide a 1515V voltage to turn on the upper tube IGBT. Therefore, the voltage generated by the driving circuit reaches a high voltage of 1515V, so that the photovoltaic power generation module can photoelectrically isolate the low-voltage circuit on the input side and the high-voltage circuit on the output side, ensuring the safety of the IGBT driving circuit. In addition, the photovoltaic power generation module can output electric energy with adjustable power by setting the photoelectric conversion efficiency, so that the charging speed of the charging and discharging module can also be adjusted accordingly. For example, when the photoelectric conversion efficiency of the photovoltaic power generation module is improved, the output power of the electric energy will increase, and the charging speed of the charging and discharging module can be accelerated to shorten the time for the charging and discharging module to store the required energy. The capacity of the charging and discharging module can be set according to actual needs. For example, the capacity can be large enough to transfer the required energy to the gate of the IGBT without losing most of the voltage to fully drive the IGBT. Moreover, sufficient energy reserves can also ensure a higher switching frequency of the H-bridge control circuit and shorten the switching delay, thereby increasing the switching frequency of the output bidirectional wave and reducing the delay of switching between the two directions of the bidirectional wave.

[0053] In the embodiment of the present application, a combination of a photovoltaic power generation module and a charge and discharge module is used to drive the IGBT to be turned on or off, thereby eliminating the use of a transformer in the IGBT drive circuit, thereby reducing the volume of the IGBT drive circuit, facilitating the miniaturization of the device, and reducing the production cost of the device.

[0054] In an alternative embodiment, if Figure 2 As shown, the charge and discharge module includes a discharge circuit 21;

[0055] The discharge circuit 21 is connected between the gate G and emitter E of the IGBT, and is configured to be turned on under the control of a discharge control signal to connect the gate G and emitter E of the IGBT and output a drive signal to the gate G of the IGBT to turn on the IGBT; or to be turned off under the control of the discharge control signal to control the IGBT to be turned off.

[0056] In the embodiment of the present application, when the discharge circuit 21 is turned on, the working state of the charge and discharge module 20 can be a discharge state or a charge and discharge state. When the discharge circuit 21 is turned off, the working state of the charge and discharge module 20 can be a charge state. By providing the discharge circuit 21 connected between the gate and the emitter of the IGBT, the control of the on and off of the IGBT can be stably and effectively achieved.

[0057] In an optional implementation, the discharge circuit 21 includes an energy storage module 211 and an isolation switch module 212;

[0058] The positive charge and discharge port of the energy storage module 211 is connected to the gate G of the IGBT, and the negative charge and discharge port of the energy storage module 211 is connected to the emitter E of the IGBT; the isolation switch module 212 is connected in series in a loop connecting the positive charge and discharge port of the energy storage module 211, the gate G of the IGBT, the emitter E of the IGBT and the negative charge and discharge port of the energy storage module 211;

[0059] The isolation switch module 212 is configured to be turned on or off under the control of the discharge control signal to turn on or off the discharge circuit 21 .

[0060] In the embodiment of the present application, by providing an isolating switch module between the positive charge and discharge port of the energy storage module and the gate of the IGBT, or between the negative charge and discharge port of the energy storage module and the emitter of the IGBT, the high-voltage circuit and the low-voltage circuit on both sides of the switch can be isolated, thereby improving circuit safety and simplifying the circuit structure, and realizing on-off control of the discharge circuit connecting the gate and emitter of the IGBT to control the conduction or cutoff of the IGBT, and can meet the application requirements of the H-bridge control circuit, which is conducive to miniaturization of equipment and cost reduction.

[0061] As a specific example, Figure 3 As shown, the isolation switch module 212 includes a first photocoupler OC1;

[0062] The positive charge and discharge port of the energy storage module 211 is connected to the gate G of the IGBT, the negative charge and discharge port of the energy storage module 211 is connected to the first output end of the first photocoupler OC1, the second output end of the first photocoupler OC1 is connected to the emitter E of the IGBT, and the input end of the first photocoupler OC1 is configured to input a discharge control signal.

[0063] As a specific example, the energy storage module 211 includes a first capacitor C1;

[0064] The first end of the first capacitor C1 serves as a positive charging and discharging port of the energy storage module 211 , and the second end of the first capacitor C1 serves as a negative charging and discharging port of the energy storage module 211 .

[0065] In the embodiment of the present application, the first photocoupler OC1 is closed to close the first capacitor discharge loop between the gate and emitter of the IGBT, thereby providing a discharge loop for the first capacitor C1, which is from the first end of the first capacitor C1 through the gate, emitter, second output end of the first photocoupler OC1, first output end and then back to the second end of the first capacitor C1, thereby providing an electrical signal to the gate of the IGBT to drive the IGBT to turn on. Conversely, the first photocoupler OC1 is disconnected to turn off the IGBT.

[0066] In the embodiment of the present application, in order to improve the stability and safety of driving the IGBT to turn on, it can be achieved by controlling the voltage of the gate of the IGBT. In an optional implementation, the discharge circuit 21 also includes a first resistor R1;

[0067] A first end of the first resistor R1 is connected to a gate G of the IGBT, and a second end of the first resistor R1 is connected to an emitter E of the IGBT.

[0068] In the embodiment of the present application, by setting the resistor R1, the voltage at the gate G when the IGBT is turned on can be limited, thereby improving the stability and safety of the IGBT operation. It can also limit the current in the discharge circuit, improve the circuit safety as a protection element, and protect the energy storage module (such as the first capacitor). It can also speed up the circuit power-off when the discharge circuit is disconnected, and the consumption of the charge between the gate and the emitter of the IGBT, so as to speed up the shutdown of the IGBT.

[0069] As another specific example, Figure 4 As shown, the isolation switch module 212 includes a second photocoupler OC2;

[0070] The positive charge and discharge port of the energy storage module 211 is connected to the second output terminal of the second photocoupler OC2, the negative charge and discharge port of the energy storage module 211 is connected to the emitter E of the IGBT, the first output terminal of the second photocoupler OC2 is connected to the gate G of the IGBT, and the input terminal of the second photocoupler OC2 is configured to input a discharge control signal.

[0071] As another specific example, the energy storage module 211 includes a second capacitor C2;

[0072] The first end of the second capacitor C2 serves as a positive charging and discharging port of the energy storage module 211 , and the second end of the second capacitor C2 serves as a negative charging and discharging port of the energy storage module 211 .

[0073] In the embodiment of the present application, the second photocoupler OC2 is closed to close the second capacitor discharge loop between the gate and emitter of the IGBT, thereby providing a discharge loop for the second capacitor C2, which is from the first end of the second capacitor C2 through the second output end of the second photocoupler OC2, the first output end, the gate of the IGBT, and the emitter, and then returns to the second end of the second capacitor C2, thereby providing an electrical signal to the gate of the IGBT to drive the IGBT to turn on. Conversely, the second photocoupler OC2 is disconnected to turn off the IGBT. The charge and discharge module in the embodiment of the present application, as known to those skilled in the art, can also be implemented by other circuits that can realize the functions of the above-mentioned charge and discharge module.

[0074] In the embodiment of the present application, in order to improve the stability and safety of driving the IGBT to turn on, it can be achieved by controlling the voltage of the gate of the IGBT. In an optional implementation, the discharge circuit 21 also includes a first voltage regulator diode D1;

[0075] The cathode of the first voltage stabilizing diode D1 is connected to the positive charge and discharge port of the energy storage module 211 , and the anode of the first voltage stabilizing diode D1 is connected to the negative charge and discharge port of the energy storage module 211 .

[0076] In the embodiment of the present application, by setting the first voltage stabilizing diode D1, the voltage at the gate G when the IGBT is turned on can be limited, thereby improving the stability and safety of the IGBT operation. It can also limit the current in the discharge circuit, serve as a protection element to improve circuit safety, and protect the energy storage module (such as the second capacitor).

[0077] In an optional implementation, the discharge circuit 21 further includes a third photocoupler OC3;

[0078] A first output terminal of the third photocoupler OC3 is connected to the emitter E of the IGBT, a second output terminal of the third photocoupler OC3 is connected to the gate G of the IGBT, and an input terminal of the third photocoupler OC3 is configured to input a third control signal.

[0079] In the embodiment of the present application, when the discharge control signal controls the second photocoupler OC2 to be closed, the third control signal can control the third photocoupler OC3 to be disconnected to turn on the IGBT. When the discharge control signal controls the second photocoupler OC2 to be disconnected, the third control signal can control the third photocoupler OC3 to be closed, which can accelerate the consumption of the charge between the gate and the emitter of the IGBT when the discharge circuit is disconnected, so as to accelerate the closing of the IGBT.

[0080] The photovoltaic power generation module 10 in the embodiment of the present application can be an electric-light-electric conversion module, and its energy conversion process is electric energy-light energy-electric energy, that is, the input electric energy is first converted into light energy, and then the light energy is converted into electric energy and output. The photovoltaic power generation module 10 can also be a light-electric conversion module, and its energy conversion process is to directly convert light energy into electric energy and output it, such as a solar power generation module.

[0081] In an alternative embodiment, if Figure 5 As shown, the photovoltaic power generation module 10 includes an electro-optical conversion module 11 and a photoelectric conversion module 12;

[0082] The electrical-optical conversion module 11 is configured to convert the input electrical signal into an optical signal and output it;

[0083] The photoelectric conversion module 12 is configured to acquire an optical signal, convert it into a charging signal, and output it.

[0084] In the embodiment of the present application, the photoelectric conversion module 12 outputs a charging signal to charge the energy storage module 211. The specific implementation of the electro-optical conversion module 11 and the photoelectric conversion module 12 can be set according to actual needs. The electro-optical conversion module 11 can be configured to convert the input electrical signal into an optical signal and output it under the control of the power generation control signal. As a specific example, the electro-optical conversion module 11 may include a light emitting diode, etc., and the photoelectric conversion module 12 may include at least one of a photoelectric sensor, a photocell, etc. By providing a photovoltaic power generation module to provide charging power to the energy storage module, the use of a transformer is abandoned, which is conducive to miniaturization of the equipment and reduction of production costs.

[0085] In an optional embodiment, the charge and discharge module further includes a charging circuit 22;

[0086] The charging circuit 22 is configured to transmit the charging signal output through the positive output terminal and the negative output terminal of the photoelectric conversion module 12 .

[0087] In an embodiment of the present application, the charging circuit 22 can be configured to connect the positive output end of the photoelectric conversion module 12 to the positive charging and discharging port of the energy storage module 211, and to connect the negative output end of the photoelectric conversion module 12 to the negative charging and discharging port of the energy storage module 211.

[0088] As a specific example, Figure 3 and Figure 5 As shown, the positive output terminal of the photoelectric conversion module 12 is connected to the first end of the first capacitor C1, and the negative output terminal of the photoelectric conversion module 12 is connected to the second end of the first capacitor C1. As another specific example, Figure 4 and Figure 5As shown, the positive output end of the photoelectric conversion module 12 is connected to the first end of the second capacitor C2, and the negative output end of the photoelectric conversion module 12 is connected to the second end of the second capacitor C2.

[0089] The present application also provides an H-bridge control circuit, which can be applied to defibrillators, motor drive equipment, inverters and other equipment. Figure 6 As shown, the H-bridge control circuit includes four IGBTs constituting the H-bridge and two IGBT drive circuits in the above-mentioned embodiments;

[0090] Wherein, the first IGBT201 and the third IGBT203 are sequentially connected in series between the positive reference voltage terminal Vdd and the zero reference voltage terminal, the second IGBT202 and the fourth IGBT204 are sequentially connected in series between the positive reference voltage terminal Vdd and the zero reference voltage terminal, the series connection point between the first IGBT201 and the third IGBT203 serves as the first drive output terminal, and the series connection point between the second IGBT202 and the fourth IGBT204 serves as the second drive output terminal;

[0091] The first IGBT driving circuit 101 is configured to control the first IGBT 201 to be turned on or off, and the second IGBT driving circuit 102 is configured to control the second IGBT 202 to be turned on or off.

[0092] In an optional implementation, the operating mode of the H-bridge control circuit includes a first operating mode and a second operating mode;

[0093] In the first working mode, the first IGBT 201 and the fourth IGBT 204 are controlled to be turned on, and the second IGBT 202 and the third IGBT 203 are controlled to be turned off, so that the load 300 connected between the first driving output terminal and the second driving output terminal is fed with a current signal flowing from the first driving output terminal to the second driving output terminal;

[0094] In the second working mode, the first IGBT 201 and the fourth IGBT 204 are controlled to be turned off, and the second IGBT 202 and the third IGBT 203 are controlled to be turned on, so that the load 300 is supplied with a current signal flowing from the second driving output terminal to the first driving output terminal.

[0095] In the embodiment of the present application, the first IGBT201 and the second IGBT202 are in parallel and are the upper IGBTs in the H-bridge; the third IGBT203 and the fourth IGBT204 are in parallel and are the lower IGBTs in the H-bridge. For the upper IGBTs in the H-bridge (the first IGBT201 and the second IGBT202), the IGBT driving circuit in the embodiment of the present application can be used to control the on or off. For the lower IGBTs in the H-bridge (the third IGBT203 and the fourth IGBT204), since the emitter is connected to the zero reference voltage terminal, a low voltage can be provided to the gate when driving it to turn on. The embodiment of the present application uses a driving circuit of an IGBT without a transformer to drive the upper tube in the H-bridge to turn on or off, which improves circuit safety and is conducive to equipment miniaturization and cost reduction.

[0096] The present application also provides a defibrillator, such as Figure 7 As shown, the defibrillator 001 includes the H-bridge control circuit 100 in the above embodiment. The load 300 connected to the defibrillator 001 can be a patient. The defibrillator 001 can output a bidirectional wave signal to the patient through the first drive output terminal and the second drive output terminal to provide a defibrillation shock. The bidirectional wave signal output by the defibrillator has two modes, and the switching between the two modes is achieved by the H-bridge control circuit 100. Figure 6 and Figure 7 As shown, if the first IGBT201 and the fourth IGBT204 in the H-bridge control circuit 100 are controlled to be turned on, and the second IGBT202 and the third IGBT203 are controlled to be turned off, the bidirectional wave signal output by the defibrillator is in the first mode, in which the load 300 connected between the first drive output terminal and the second drive output terminal can be fed with a current signal flowing from the first drive output terminal to the second drive output terminal. If the first IGBT201 and the fourth IGBT204 in the H-bridge control circuit 100 are controlled to be turned off, and the second IGBT202 and the third IGBT203 are controlled to be turned on, the bidirectional wave signal output by the defibrillator is in the second mode, in which the load 300 can be fed with a current signal flowing from the second drive output terminal to the first drive output terminal. The defibrillator of the embodiment of the present application can improve the stability of the output bidirectional wave signal and the safety of the circuit by using the H-bridge control circuit without using a transformer, which is conducive to the miniaturization of the defibrillator and the reduction of production costs.

[0097] It should be understood that the above embodiments are exemplary and are not intended to include all possible implementations included in the claims. Various modifications and changes may be made on the basis of the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form other embodiments of the present application that may not be explicitly described. Therefore, the above embodiments only express several implementations of the present application and do not limit the scope of protection of the patent of this application.

Claims

1. A driving circuit for an IGBT, It is characterized in that The IGBT driving circuit comprises: A photovoltaic power generation module is configured to convert a light signal into a charging signal and output the charging signal; And, a charge and discharge module is configured to obtain a charging signal output by the photovoltaic power generation module to charge, and discharge under the control of an input discharge control signal and output a driving signal to turn on the IGBT.

2. The IGBT driving circuit according to claim 1, It is characterized in that The charging and discharging module includes a discharging circuit; The discharge circuit is connected between the gate and emitter of the IGBT, and is configured to be turned on under the control of the discharge control signal to connect the gate and emitter of the IGBT and output the drive signal to the gate of the IGBT to turn on the IGBT; or to be turned off under the control of the discharge control signal to control the IGBT to be turned off.

3. The IGBT driving circuit according to claim 2, It is characterized in that The discharge circuit includes an energy storage module and an isolating switch module; The positive charge and discharge port of the energy storage module is connected to the gate of the IGBT, and the negative charge and discharge port of the energy storage module is connected to the emitter of the IGBT; the isolation switch module is connected in series in a loop connecting the positive charge and discharge port of the energy storage module, the gate of the IGBT, the emitter of the IGBT and the negative charge and discharge port of the energy storage module; The isolation switch module is configured to be turned on or off under the control of the discharge control signal to turn on or off the discharge circuit.

4. The IGBT driving circuit according to claim 3, It is characterized in that The isolation switch module includes a first photoelectric coupler; The positive charge and discharge port of the energy storage module is connected to the gate of the IGBT, the negative charge and discharge port of the energy storage module is connected to the first output end of the first photocoupler, the second output end of the first photocoupler is connected to the emitter of the IGBT, and the input end of the first photocoupler is configured to input the discharge control signal.

5. The IGBT driving circuit according to claim 4, It is characterized in that The energy storage module includes a first capacitor; The first end of the first capacitor serves as a positive charging and discharging port of the energy storage module, and the second end of the first capacitor serves as a negative charging and discharging port of the energy storage module.

6. The IGBT driving circuit according to claim 2, It is characterized in that The discharge circuit also includes a first resistor; A first end of the first resistor is connected to the gate of the IGBT, and a second end of the first resistor is connected to the emitter of the IGBT.

7. The IGBT driving circuit according to claim 3, It is characterized in that The isolating switch module includes a second photoelectric coupler; The positive charge and discharge port of the energy storage module is connected to the second output end of the second photocoupler, the negative charge and discharge port of the energy storage module is connected to the emitter of the IGBT, the first output end of the second photocoupler is connected to the gate of the IGBT, and the input end of the second photocoupler is configured to input the discharge control signal.

8. The IGBT driving circuit according to claim 7, It is characterized in that The energy storage module includes a second capacitor; The first end of the second capacitor serves as the positive charge and discharge port of the energy storage module, and the second end of the second capacitor serves as the negative charge and discharge port of the energy storage module.

9. The IGBT driving circuit according to claim 2, It is characterized in that The discharge circuit also includes a third photocoupler; The first output terminal of the third photocoupler is connected to the emitter of the IGBT, the second output terminal of the third photocoupler is connected to the gate of the IGBT, and the input terminal of the third photocoupler is configured to input a third control signal.

10. The IGBT driving circuit according to any one of claims 1 to 9, It is characterized in that The photovoltaic power generation module includes an electro-optical conversion module and a photoelectric conversion module; The electro-optical conversion module is configured to convert the input electrical signal into the optical signal and output the optical signal; The photoelectric conversion module is configured to obtain the optical signal, convert it into the charging signal, and output it.

11. The IGBT driving circuit according to claim 10, It is characterized in that The charging and discharging module also includes a charging circuit; The charging circuit is configured to transmit the charging signal output through the positive output terminal and the negative output terminal of the photoelectric conversion module.

12. An H-bridge control circuit, It is characterized in that A driving circuit comprising four IGBTs constituting an H-bridge and two IGBTs as claimed in any one of claims 1 to 11; The first IGBT and the third IGBT are sequentially connected in series between the positive reference voltage terminal and the zero reference voltage terminal, the second IGBT and the fourth IGBT are sequentially connected in series between the positive reference voltage terminal and the zero reference voltage terminal, the series connection point between the first IGBT and the third IGBT serves as the first drive output terminal, and the series connection point between the second IGBT and the fourth IGBT serves as the second drive output terminal; The driving circuit of the first IGBT is configured to control the first IGBT to be turned on or off, and the driving circuit of the second IGBT is configured to control the second IGBT to be turned on or off.

13. The H-bridge control circuit according to claim 12, It is characterized in that The operating mode of the H-bridge control circuit includes a first operating mode and a second operating mode; In the first working mode, the first IGBT and the fourth IGBT are controlled to be turned on, and the second IGBT and the third IGBT are controlled to be turned off, so that a current signal flowing from the first driving output end to the second driving output end is input to a load connected between the first driving output end and the second driving output end; In the second operating mode, the first IGBT and the fourth IGBT are controlled to be turned off, and the second IGBT and the third IGBT are controlled to be turned on, so that the load is fed with a current signal flowing from the second drive output terminal to the first drive output terminal.

14. A defibrillator, It is characterized in that Comprising the H-bridge control circuit as claimed in claim 12 or 13.

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