Driving circuit and electronic equipment

Abstract

The utility model discloses a driving circuit and electronic equipment, relates to the technical field of power electronics, and discloses the driving circuit and the electronic equipment, which comprise a power supply voltage module and a driving control module, the power supply end of the power voltage module is connected with the power input end of the drive control module and used for inputting power voltage to the drive control module. The power supply voltage module samples the output power supply voltage to obtain a voltage sampling signal, performs differential transmission on the voltage sampling signal to obtain a voltage feedback signal, and controls the output power supply voltage based on the voltage feedback signal; the driving control module carries out differential transmission on an incoming modulation control signal and outputs a control signal, and detection of power supply voltage and transmission of the modulation control signal are respectively realized through differential transmission of the power supply voltage module and the driving control module. The defect that the device replacement cost is increased due to the fact that an optical coupler and magnetic coupling isolation (or capacitive coupling isolation) are used is overcome.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to drive circuits and electronic equipment. Background Art

[0002] In the field of power electronics, gate drive technology is a common and important circuit design used to control the switching operation of power semiconductor devices (such as MOSFET, SiC, IGBT, GaN, etc.).

[0003] Among them, the modulation control signal (for example, pulse width modulation "PWM" signal) used to control the on / off switching of the power switch in the gate drive technology is mostly transmitted using magnetic coupling isolation or capacitive coupling isolation. At the same time, in order to achieve the buffering and amplification control during the transmission of the modulation control signal in the gate drive technology and to achieve the effectiveness of controlling the switching operation of the power semiconductor device, the intervention of the gate driver is generally required. The gate driver that intervenes needs to be connected to a stable power supply voltage, and whether the connected power supply voltage is stable is generally fed back to the corresponding controller through an optical coupler.

[0004] However, due to problems with magnetic coupling isolation, capacitive coupling isolation and optical couplers themselves, their speed is limited and their reliability is low during use. It is necessary to replace the devices at a fixed period of time, which increases the cost of the devices.

[0005] Application Contents

[0006] The main purpose of the present application is to provide a driving circuit and an electronic device, aiming to solve the technical problem of high device cost in conventional gate driving solutions.

[0007] To achieve the above object, the present application proposes a driving circuit, the driving circuit comprising a power supply voltage module and a driving control module, and a switch module is connected to the output control end of the driving control module;

[0008] The power supply end of the power supply voltage module is connected to the power supply input end of the drive control module, and is used to input the power supply voltage to the drive control module;

[0009] The power supply voltage module samples the output power supply voltage to obtain a voltage sampling signal, performs differential transmission on the voltage sampling signal to obtain a voltage feedback signal, and controls the output power supply voltage based on the voltage feedback signal;

[0010] The driving control module performs differential transmission on the incoming modulated control signal, outputs a control signal, and gives the control signal to the switch module to drive the switch module to turn on and off.

[0011] In one embodiment, the power supply voltage module includes a power supply control unit, a voltage conversion unit and a voltage sampling unit;

[0012] The control end of the power control unit is connected to the input end of the voltage conversion unit, the voltage feedback end of the power control unit is connected to the output end of the voltage sampling unit, and the sampling input end of the voltage sampling unit is connected to the output end of the voltage conversion unit;

[0013] The power control unit is used to control the on and off of the conversion channel of the voltage conversion unit;

[0014] The voltage conversion unit is used to convert the connected bus voltage and output the power supply voltage;

[0015] The voltage sampling unit is used to sample the power supply voltage output by the voltage conversion unit and feed back the sampling result to the power supply control unit.

[0016] In one embodiment, the power control unit comprises a primary controller and a first switching semiconductor;

[0017] The control output terminal of the primary controller is connected to the gate / control electrode of the first switch semiconductor, the drain / collector of the first switch semiconductor is connected to the input terminal of the voltage conversion unit, and the source / emitter of the first switch semiconductor is connected to the ground terminal.

[0018] In one embodiment, the voltage conversion unit includes a transformer, a secondary diode and an output capacitor group, and the transformer includes a primary coil and a secondary coil;

[0019] A first end of the primary coil is connected to the bus voltage, and a second end of the primary coil is connected to the drain / collector of the first switching semiconductor;

[0020] The first end of the secondary coil is connected to the positive electrode of the secondary diode, the second end of the secondary coil is connected to the ground, and the negative electrode of the secondary diode is connected to the power supply end of the voltage conversion unit;

[0021] The first end of the output capacitor group is connected to the connection line between the cathode of the secondary diode and the power supply end of the voltage conversion unit, and the second end of the output capacitor group is connected to the connection line between the second end of the secondary coil and the ground end.

[0022] In one embodiment, the voltage sampling unit includes a voltage sampling comparator and a first millimeter wave isolation device, and the first millimeter wave isolation device includes a first millimeter wave transmitter and a first millimeter wave receiver;

[0023] The sampling input end of the voltage sampling comparator is connected to the connection line between the first end of the output capacitor group and the power supply end of the voltage conversion unit, the first millimeter wave transmitter is connected to the sampling output end of the voltage sampling comparator, and the output end of the first millimeter wave receiver is connected to the voltage feedback end of the primary controller.

[0024] In one embodiment, the drive control module includes a microcontroller, a drive transmission unit and a power supply voltage detection unit;

[0025] The output end of the microcontroller is connected to the input end of the drive transmission unit, the output end of the drive transmission unit is connected to the switch module, the input end of the power supply voltage detection unit is connected to the connection line between the power supply input end of the drive transmission unit and the power supply end of the voltage conversion unit, and the output end of the power supply voltage detection unit is connected to the input end of the microcontroller;

[0026] The microcontroller is used to output the modulation control signal according to the voltage detection signal fed back by the power supply voltage detection unit;

[0027] The driving transmission unit is used to transmit the received modulation control signal to the switch module;

[0028] The power supply voltage detection unit is used to detect the power supply voltage output by the voltage conversion unit to the drive transmission unit, and feed back the detection result to the microcontroller.

[0029] In one embodiment, the driving transmission unit includes a second millimeter wave isolation device and a gate driver, and the second millimeter wave isolation device includes a second millimeter wave transmitter and a second millimeter wave receiver;

[0030] The second millimeter wave transmitter is connected to the output end of the microcontroller, the second millimeter wave receiver is connected to the level access end of the gate driver, and the output end of the gate driver is connected to the switch module.

[0031] In one embodiment, the power supply voltage detection unit includes a ripple detector and a third millimeter wave isolation device, and the third millimeter wave isolation device includes a third millimeter wave transmitter and a third millimeter wave receiver;

[0032] The input end of the ripple detector is connected to the connection line between the power supply end of the voltage conversion unit and the power supply input end of the gate driver, the output end of the ripple detector is connected to the third millimeter wave transmitter, and the third millimeter wave receiver is connected to the input end of the microcontroller.

[0033] In one embodiment, the switch module comprises a second switch semiconductor;

[0034] The gate / control electrode of the second switch semiconductor is connected to the output end of the gate driver, the drain / collector of the second switch semiconductor is connected to the high voltage bus, and the source / emitter of the second switch semiconductor is connected to the ground.

[0035] The present application also proposes an electronic device, including a driving circuit, wherein the driving circuit includes a power supply voltage module and a driving control module, and an output control terminal of the driving control module is connected to a switch module;

[0036] The power supply end of the power supply voltage module is connected to the power supply input end of the drive control module, and is used to input the power supply voltage to the drive control module;

[0037] The power supply voltage module samples the output power supply voltage to obtain a voltage sampling signal, performs differential transmission on the voltage sampling signal to obtain a voltage feedback signal, and controls the output power supply voltage based on the voltage feedback signal;

[0038] The driving control module performs differential transmission on the incoming modulated control signal, outputs a control signal, and gives the control signal to the switch module to drive the switch module to turn on and off.

[0039] One or more technical solutions proposed in this application have at least the following technical effects:

[0040] A driving circuit is proposed. The driving circuit includes a power supply voltage module and a driving control module. The output control end of the driving control module is connected to a switch module. The power supply end of the power supply voltage module is connected to the power input end of the driving control module, so as to input the power supply voltage to the driving control module. The power supply voltage module samples the output power supply voltage to obtain a voltage sampling signal, performs differential transmission on the voltage sampling signal to obtain a voltage feedback signal, and controls the output power supply voltage based on the voltage feedback signal. The driving control module performs differential transmission on the input modulation control signal to obtain a control signal, and gives the control signal to the switch module to drive the switch module to turn on and off. The power supply voltage is detected and the modulation control signal is transmitted respectively through the differential transmission of the power supply voltage module and the driving control module, thereby avoiding the defect of increased device replacement cost due to the use of optical couplers and magnetic coupling isolation (or capacitive coupling isolation). BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] Figure 1 This is a module schematic diagram of the driving circuit of this application;

[0044] Figure 2 This is a schematic diagram of the power supply voltage module and the drive control module of the present application;

[0045] Figure 3 A schematic diagram of the circuit structure of the driving circuit of this application;

[0046] Figure 4 Schematic diagram of the structure of the millimeter wave isolation unit.

[0047] Description of Figure Numbers:

[0048] 10. Power supply voltage module; 20. Drive control module; 30. Switch module;

[0049] 101, power control unit; MCU1, primary controller; Q1, first switch semiconductor; 102, voltage conversion unit; T1, transformer; D1, secondary diode; C, output capacitor group; 103, voltage sampling unit; U1, voltage sampling comparator; U2, first millimeter wave isolation device;

[0050] MCU2, microcontroller; 201, drive transmission unit; U3, second millimeter wave isolation device; U4, gate driver; 202, power supply voltage detection unit; U5, ripple detector; U6, third millimeter wave isolation device;

[0051] Q2, second switching semiconductor.

[0052] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0055] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0056] In gate drive technology, the modulation control signal (for example, pulse width modulation "PWM" signal) used to control the on / off switching of the power switch is mostly transmitted using magnetic coupling isolation or capacitive coupling isolation. At the same time, in order to modulate the buffering and amplification control during the transmission of the control signal in the gate drive technology and realize the effectiveness of controlling the switching operation of the power semiconductor device, the intervention of the gate driver is generally required. The intervened gate driver needs to be connected to a stable power supply voltage, and whether the connected power supply voltage is stable is generally fed back to the corresponding controller through an optical coupler. However, due to the problems of magnetic coupling isolation, capacitive coupling isolation and optical couplers themselves, their speed is limited and their reliability is low during use. It is necessary to replace the device at a fixed time, which increases the cost of the device.

[0057] In order to solve this technical problem, the present application provides a driving circuit to solve the technical problem of high device cost in conventional gate driving solutions.

[0058] See also Figure 1 , the present application proposes a driving circuit, the driving circuit comprising a power supply voltage module 10 and a driving control module 20, the output control end of the driving control module 20 is connected to a switch module 30;

[0059] The power supply end of the power supply voltage module 10 is connected to the power supply input end of the drive control module 20, and is used to input the power supply voltage to the drive control module 20;

[0060] The power supply voltage module 10 samples the output power supply voltage to obtain a voltage sampling signal, performs differential transmission on the voltage sampling signal to obtain a voltage feedback signal, and controls the output power supply voltage based on the voltage feedback signal. The differential transmission of the power supply voltage module 10 realizes the ability to suppress common-mode transients, thereby avoiding the need to suppress common-mode transients through an optical coupler. However, due to the problem of the parasitic input and output capacitance of the optical coupler itself, the ability to suppress common-mode transients will weaken with the increase of usage time, and there will also be speed limitations, easy aging, and replacement costs caused by the need to replace components regularly.

[0061] The drive control module 20 performs differential transmission on the incoming modulation control signal, outputs a control signal, and gives the control signal to the switch module 30 to drive the switch module 30 to turn on and off. The transmission effect of the modulation control signal is achieved through the differential transmission of the drive control module 20, thereby avoiding the need to perform isolated transmission of the modulation control signal through magnetic coupling isolation or capacitive coupling isolation. However, due to the problems of magnetic coupling isolation or capacitive coupling isolation itself, the transmission speed slows down with the increase of usage time, and the replacement cost of components needs to be replaced regularly.

[0062] For details, see Figure 2 , the power supply voltage module 10 includes a power supply control unit 101, a voltage conversion unit 102 and a voltage sampling unit 103;

[0063] The control end of the power control unit 101 is connected to the input end of the voltage conversion unit 102, the voltage feedback end of the power control unit 101 is connected to the output end of the voltage sampling unit 103, and the sampling input end of the voltage sampling unit 103 is connected to the output end of the voltage conversion unit 102;

[0064] The power control unit 101 is used to control the on and off of the conversion channel of the voltage conversion unit 102; the voltage conversion unit 102 is used to convert the connected bus voltage and output the power supply voltage; the voltage sampling unit 103 is used to sample the power supply voltage output by the voltage conversion unit 102 and feed the sampling result back to the power control unit 101.

[0065] according to Figure 2It can be known that the power control unit 101 determines whether the power supply voltage converted and output by the voltage conversion unit 102 is a stable power supply voltage at this time based on the sampling result transmitted by the voltage sampling unit 103. When it is determined that the power supply voltage converted and output by the voltage conversion unit 102 is not a stable power supply voltage, the conversion channel of the voltage conversion unit 102 is switched to prevent the voltage conversion unit 102 from continuously outputting an unstable power supply voltage to power the drive control module 20, thereby affecting the normal operation of the drive control module 20, increasing the load of the drive control module 20, causing overload, overheating, and damage to the drive control module 20.

[0066] For details, see Figure 3 , the power control unit 101 includes a primary controller MCU1 and a first switch semiconductor Q1;

[0067] The control output terminal of the primary controller MCU1 is connected to the gate / control electrode of the first switch semiconductor Q1, the drain / collector of the first switch semiconductor Q1 is connected to the input terminal of the voltage conversion unit 102, and the source / emitter of the first switch semiconductor Q1 is connected to the ground terminal (i.e. Figure 3 Connect to GND1 in the circuit.

[0068] Further, the voltage conversion unit 102 includes a transformer T1, a secondary diode D1 and an output capacitor group C, and the transformer T1 includes a primary coil and a secondary coil;

[0069] The first end of the primary coil is connected to the bus voltage (i.e. Figure 3 The second end of the primary coil is connected to the drain / collector of the first switching semiconductor Q1; the first end of the secondary coil is connected to the anode of the secondary diode D1, and the second end of the secondary coil is connected to the ground (i.e. Figure 3 The cathode of the secondary diode D1 is connected to the power supply terminal of the voltage conversion unit 102; the first end of the output capacitor group C is connected to the connection line between the cathode of the secondary diode D1 and the power supply terminal of the voltage conversion unit 102, and the second end of the output capacitor group C is connected to the connection line between the second end of the secondary coil and the ground terminal. Figure 3 The VCC in it is the external power supply terminal.

[0070] It should be noted that the function of the power control unit 101 and the voltage conversion unit 102 is to output a relatively stable power supply voltage VCC. When any capacitor in the output capacitor group C is damaged, the ripple of the output power supply voltage VCC will become larger, and the power supply voltage detection unit 202 will detect the abnormal ripple and feed back the voltage detection signal corresponding to the abnormal ripple to the microcontroller MCU2. The microcontroller MCU2 adjusts the output modulation control signal according to the voltage detection signal.

[0071] Combination Figure 3 Provide explanation.

[0072] The energy input by the power supply Vbus charges the inductance of the primary side of the transformer T1 through the turned-on first switching semiconductor. When the first switching semiconductor Q1 is turned off, the energy stored in the primary side of the transformer T1 is output as the power supply voltage and transmitted to the output end. The power supply voltage is fed back to the primary controller MCU1 through the voltage sampling comparator U1 and the first millimeter wave isolation device U2 to achieve power supply voltage stabilization.

[0073] Further, the voltage sampling unit 103 includes a voltage sampling comparator U1 and a first millimeter wave isolation device U2, and the first millimeter wave isolation device U2 includes a first millimeter wave transmitter and a first millimeter wave receiver;

[0074] The sampling input terminal of the voltage sampling comparator U1 is connected to the connection line between the first end of the output capacitor group C and the power supply end of the voltage conversion unit 102, the first millimeter wave transmitter is connected to the sampling output terminal of the voltage sampling comparator U1, and the output terminal of the first millimeter wave receiver is connected to the voltage feedback terminal of the primary controller MCU1.

[0075] Specifically, the present embodiment can avoid using an optical coupler because Figure 3 The first millimeter wave isolation device U2 is described below based on the actual application of the first millimeter wave isolation device U2.

[0076] First, the voltage sampling comparator U1 samples the power supply voltage output at the output end of the voltage conversion unit 102 in real time, and compares the sampled power supply voltage with the reference voltage to determine the magnitude relationship between the power supply voltage output by the power conversion unit and the reference voltage at this time, and then determines whether the power supply voltage output at this time is a stable power supply voltage.

[0077] After the voltage sampling comparator U1 generates and outputs a voltage sampling signal according to the judgment result, the voltage sampling signal is transmitted to the first millimeter wave transmitter. The first millimeter wave transmitter outputs a millimeter wave signal according to the connected voltage sampling signal. The millimeter wave signal is differentially transmitted to the first millimeter wave receiver. The first millimeter wave receiver receives the millimeter wave signal and generates a voltage feedback signal based on the millimeter wave signal. The voltage feedback signal is transmitted to the primary controller MCU1, so that the primary controller MCU1 adjusts the level state of the input voltage feedback signal output to the first switching semiconductor Q1.

[0078] Compared with the optocoupler isolator, the first millimeter wave isolation device U2 can improve the reliability and efficiency of the gate drive.

[0079] The voltage sampling comparator U1 is a voltage comparator, which can realize real-time sampling of voltage.

[0080] For details, see Figure 2 , the drive control module 20 includes a microcontroller MCU2, a drive transmission unit 201 and a power supply voltage detection unit 202;

[0081] The output end of the microcontroller MCU2 is connected to the input end of the drive transmission unit 201, the output end of the drive transmission unit 201 is connected to the switch module 30, the input end of the power supply voltage detection unit 202 is connected to the connection line between the power input end of the drive transmission unit 201 and the power supply end of the voltage conversion unit 102, and the output end of the power supply voltage detection unit 202 is connected to the input end of the microcontroller MCU2;

[0082] The microcontroller MCU2 is used to output the modulation control signal according to the voltage detection signal fed back by the power supply voltage detection unit 202; the drive transmission unit 201 is used to transmit the connected modulation control signal to the switch module 30; the power supply voltage detection unit 202 is used to detect the power supply voltage output by the voltage conversion unit 102 to the drive transmission unit 201, and feed back the detection result to the microcontroller MCU2.

[0083] according to Figure 2It can be seen that the microcontroller MCU2 outputs a modulation control signal to the drive transmission unit 201. After the modulation control signal is isolated and transmitted by the drive transmission unit 201, it is output to the switch module 30 to control the switch state of the switch module 30; at the same time, the power supply voltage detection unit 202 collects and detects the power supply voltage transmitted to the drive transmission unit 201, and feeds the detection result back to the microcontroller MCU2. The microcontroller MCU2 adaptively adjusts the output modulation control signal according to the received detection result, as described below.

[0084] For details, see Figure 3 , the driving transmission unit 201 includes a second millimeter wave isolation device U3 and a gate driver U4, and the second millimeter wave isolation device U3 includes a second millimeter wave transmitter and a second millimeter wave receiver;

[0085] The second millimeter wave transmitter is connected to the output end of the microcontroller MCU2 , the second millimeter wave receiver is connected to the level access end of the gate driver U4 , and the output end of the gate driver U4 is connected to the switch module 30 .

[0086] Specifically, the reason why this embodiment can avoid using magnetic coupling isolation or capacitive coupling isolation is that Figure 3 The second millimeter wave isolation device U3 is described below based on the actual application of the second millimeter wave isolation device U3.

[0087] The second millimeter wave transmitter in the second millimeter wave isolation device U3 is connected to the modulation control signal output by the microcontroller MCU2. The second millimeter wave transmitter outputs a millimeter wave signal according to the connected modulation control signal. The millimeter wave signal is differentially transmitted to the second millimeter wave receiver. The second millimeter wave receiver receives the millimeter wave signal and outputs a corresponding modulation control signal based on the millimeter wave signal. The modulation control signal is transmitted to the gate driver U4. The gate driver U4 amplifies the modulation control signal and transmits it to the switch module 30. The switch module 30 corresponds to the on / off state of the converter according to the received modulation control signal.

[0088] Compared with magnetic coupling isolation or capacitive coupling isolation, the transmission speed through the second millimeter wave isolation device U3 in this embodiment will not only not slow down with the use time, but also has a small delay, high transmission efficiency, and higher safety and reliability of transmission isolation.

[0089] Further, the power supply voltage detection unit 202 includes a ripple detector U5 and a third millimeter wave isolation device U6, and the third millimeter wave isolation device U6 includes a third millimeter wave transmitter and a third millimeter wave receiver;

[0090] The input end of the ripple detector U5 is connected to the connection line between the power supply end of the voltage conversion unit 102 and the power input end of the gate driver U4, the output end of the ripple detector U5 is connected to the third millimeter wave transmitter, and the third millimeter wave receiver is connected to the input end of the microcontroller MCU2.

[0091] In addition, if the output capacitor group C in the voltage conversion unit 102 fails, the ripple signal in the power supply voltage output through the output capacitor group C will be enhanced, and the power supply voltage with a strong ripple signal supplies power to the gate driver U4, which will affect the working state of the gate driver U4.

[0092] Therefore, in order to detect the above situation, the present embodiment further provides a power supply voltage detection unit 202, which includes a ripple detector U5 and a third millimeter wave isolation device U6. The ripple detector U5 collects the power supply voltage output to the gate driver U4 in real time, detects whether there is an excessive ripple signal in the collected power supply voltage, generates a corresponding detection signal according to the detection result, and transmits it to the third millimeter wave transmitter of the third millimeter wave isolation device U6. The third millimeter wave transmitter outputs a millimeter wave signal according to the received detection signal, and the millimeter wave signal is differentially transmitted to the third millimeter wave receiver. The third millimeter wave receiver receives the millimeter wave signal, and outputs a corresponding detection signal based on the millimeter wave signal, and transmits the detection signal to the microcontroller MCU2. The microcontroller MCU2 adjusts the output modulation control signal according to the detection signal.

[0093] If the information reflected by the detection signal is that there is a large ripple signal in the power supply voltage, the microcontroller MCU2 stops outputting the modulation control signal to stop the operation of outputting the modulation control signal to the output switch module 30 via the gate driver U4, so as to achieve safe control of the switch module 30, and generate an alarm signal to prompt the operator.

[0094] It should be noted that the ripple detector U5 in this embodiment is a ripple tester.

[0095] Further, the switch module 30 includes a second switch semiconductor Q2;

[0096] The gate / control electrode of the second switch semiconductor Q2 is connected to the output end of the gate driver U4, and the drain / collector of the second switch semiconductor Q2 is connected to the high voltage bus (i.e. Figure 3 The source / emitter of the second switch semiconductor Q2 is connected to the ground terminal (i.e. Figure 3 Connect to GND3 in the circuit.

[0097] Specifically, in this embodiment, the gate / control electrode of the second switch semiconductor Q2 is connected to the output end of the gate driver U4, and enters the corresponding switching state according to the level state of the modulation control signal output by the gate driver U4; and if the level state of the modulation control signal is a low level, the second switch semiconductor Q2 enters the off state; if the level state of the modulation control signal is a high level, the second switch semiconductor Q2 enters the on state, connecting the high-voltage bus and the ground to form a path.

[0098] Also, see Figure 4 , Figure 4 This is a schematic diagram of the structure of the first millimeter wave isolation device U2, the second millimeter wave isolation device U3 and the third millimeter wave isolation device U6 involved in this application. According to the figure, the millimeter wave transmitter in the millimeter wave isolation device can output a millimeter wave signal corresponding to the signal according to the received signal, and the millimeter wave signal will be differentially transmitted through the transmitting antenna on the millimeter wave transmitter. The transmission process is received by the receiving antenna on the millimeter wave receiver in the same millimeter wave isolation device. The millimeter wave receiver outputs a corresponding signal according to the received millimeter wave signal to realize the coupled transmission of the signal.

[0099] The present application also proposes an electronic device, which includes the driving circuit as described above. The specific structure of the driving circuit refers to the above embodiments. Since the electronic device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0100] The above description is only an exemplary embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A driving circuit, characterized in that: The driving circuit comprises a power supply voltage module and a driving control module, and the output control terminal of the driving control module is connected to a switch module; The power supply end of the power supply voltage module is connected to the power supply input end of the drive control module, and is used to input the power supply voltage to the drive control module; The power supply voltage module samples the output power supply voltage to obtain a voltage sampling signal, performs differential transmission on the voltage sampling signal to obtain a voltage feedback signal, and controls the output power supply voltage based on the voltage feedback signal; The driving control module performs differential transmission on the incoming modulated control signal, outputs a control signal, and gives the control signal to the switch module to drive the switch module to turn on and off.

2. The driving circuit according to claim 1, characterized in that: The power supply voltage module includes a power supply control unit, a voltage conversion unit and a voltage sampling unit; The control end of the power control unit is connected to the input end of the voltage conversion unit, the voltage feedback end of the power control unit is connected to the output end of the voltage sampling unit, and the sampling input end of the voltage sampling unit is connected to the output end of the voltage conversion unit; The power control unit is used to control the on and off of the conversion channel of the voltage conversion unit; The voltage conversion unit is used to convert the connected bus voltage and output the power supply voltage; The voltage sampling unit is used to sample the power supply voltage output by the voltage conversion unit and feed back the sampling result to the power supply control unit.

3. The driving circuit according to claim 2, characterized in that: The power control unit includes a primary controller and a first switching semiconductor; The control output terminal of the primary controller is connected to the gate / control electrode of the first switch semiconductor, the drain / collector of the first switch semiconductor is connected to the input terminal of the voltage conversion unit, and the source / emitter of the first switch semiconductor is connected to the ground terminal.

4. The driving circuit according to claim 3, characterized in that: The voltage conversion unit includes a transformer, a secondary diode and an output capacitor group, and the transformer includes a primary coil and a secondary coil; A first end of the primary coil is connected to the bus voltage, and a second end of the primary coil is connected to the drain / collector of the first switching semiconductor; The first end of the secondary coil is connected to the positive electrode of the secondary diode, the second end of the secondary coil is connected to the ground, and the negative electrode of the secondary diode is connected to the power supply end of the voltage conversion unit; The first end of the output capacitor group is connected to the connection line between the cathode of the secondary diode and the power supply end of the voltage conversion unit, and the second end of the output capacitor group is connected to the connection line between the second end of the secondary coil and the ground end.

5. The driving circuit according to claim 4, characterized in that: The voltage sampling unit includes a voltage sampling comparator and a first millimeter wave isolation device, and the first millimeter wave isolation device includes a first millimeter wave transmitter and a first millimeter wave receiver; The sampling input end of the voltage sampling comparator is connected to the connection line between the first end of the output capacitor group and the power supply end of the voltage conversion unit, the first millimeter wave transmitter is connected to the sampling output end of the voltage sampling comparator, and the output end of the first millimeter wave receiver is connected to the voltage feedback end of the primary controller.

6. The driving circuit according to claim 5, characterized in that: The drive control module includes a microcontroller, a drive transmission unit and a power supply voltage detection unit; The output end of the microcontroller is connected to the input end of the drive transmission unit, the output end of the drive transmission unit is connected to the switch module, the input end of the power supply voltage detection unit is connected to the connection line between the power supply input end of the drive transmission unit and the power supply end of the voltage conversion unit, and the output end of the power supply voltage detection unit is connected to the input end of the microcontroller; The microcontroller is used to output the modulation control signal according to the voltage detection signal fed back by the power supply voltage detection unit; The driving transmission unit is used to transmit the received modulation control signal to the switch module; The power supply voltage detection unit is used to detect the power supply voltage output by the voltage conversion unit to the drive transmission unit, and feed back the detection result to the microcontroller.

7. The driving circuit according to claim 6, characterized in that: The driving transmission unit includes a second millimeter wave isolation device and a gate driver, and the second millimeter wave isolation device includes a second millimeter wave transmitter and a second millimeter wave receiver; The second millimeter wave transmitter is connected to the output end of the microcontroller, the second millimeter wave receiver is connected to the level access end of the gate driver, and the output end of the gate driver is connected to the switch module.

8. The driving circuit according to claim 7, characterized in that: The power supply voltage detection unit includes a ripple detector and a third millimeter wave isolation device, and the third millimeter wave isolation device includes a third millimeter wave transmitter and a third millimeter wave receiver; The input end of the ripple detector is connected to the connection line between the power supply end of the voltage conversion unit and the power supply input end of the gate driver, the output end of the ripple detector is connected to the third millimeter wave transmitter, and the third millimeter wave receiver is connected to the input end of the microcontroller.

9. The driving circuit according to claim 8, characterized in that: The switch module includes a second switch semiconductor; The gate / control electrode of the second switch semiconductor is connected to the output end of the gate driver, the drain / collector of the second switch semiconductor is connected to the high voltage bus, and the source / emitter of the second switch semiconductor is connected to the ground.

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

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