Intelligent switch driving control circuit

Abstract

The application discloses an intelligent switch driving control circuit, and relates to the technical field of switch driving, which comprises a micro control module, driving switch elements of positive periods and negative periods of an inverter output module to work, and inverting a direct current power connected with a power module; when the inverting work is not performed, overvoltage detection of the power module is performed by an inverter detection module according to a set overvoltage threshold value, and when overvoltage occurs, the power module is controlled to perform voltage division; when the inverting work is performed, current detection and overcurrent judgment of the switch elements of the positive periods or the switch elements of the negative periods are performed by the inverter detection module according to an inverting state and a set overcurrent threshold value, and when overcurrent of the switch elements of the positive periods occurs, working current of the switch elements of the positive periods is adjusted, and when overcurrent of the switch elements of the negative periods occurs, working current of the switch elements of the negative periods is adjusted. The intelligent switch driving control circuit can improve inverting efficiency and driving safety of the switch elements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switch driving, and particularly relates to an intelligent switch driving control circuit. BACKGROUND

[0002] In the process of DC-AC conversion, an inverter composed of MOS tubes is generally adopted to complete the inverter adjustment work driven by a single-chip microcomputer. In the prior art, in order to improve the control accuracy of the inverter, a current sampling circuit composed of multiple groups of sampling resistors or current transformers is adopted to perform current sampling processing on the MOS tubes, which increases the detection cost. When the inverter has current abnormalities, the inverter stops working, and the input power or the driving signal provided by the single-chip microcomputer cannot be timely adjusted and processed, which not only reduces the inverter efficiency, but also has certain safety hazards, and therefore needs to be improved. SUMMARY

[0003] The embodiment of the present application provides an intelligent switch driving control circuit to solve the problems in the background art.

[0004] According to the embodiment of the present application, an intelligent switch driving control circuit is provided, which comprises:

[0005] A power module is connected with the micro-control module and the inverter detection module, and is used for connecting the DC power, performing voltage division on the DC power when the micro-control module does not drive the inverter output module to inverter and the inverter detection module detects that the DC power is overvoltage;

[0006] An inverter output module is connected with the power module and the micro-control module, and is used for receiving the first inverter signal and the second inverter signal output by the micro-control module and driving the switch element in the negative cycle and the switch element in the positive cycle to inverter the DC power respectively;

[0007] An inverter detection module is connected with the micro-control module and the inverter output module, and is used for setting an overcurrent threshold and an overvoltage threshold, performing overvoltage judgment and outputting a first detection signal when the DC power is greater than the overvoltage threshold, performing current detection on the switch element in the negative cycle of the inverter output module and outputting a second detection signal when the first inverter signal is received, performing current detection on the switch element in the positive cycle of the inverter output module and outputting a third detection signal when the second inverter signal is received, comparing the overcurrent threshold and the voltage of the second detection signal or the third detection signal, and outputting a fourth detection signal when the second detection signal or the third detection signal is greater than the overcurrent threshold;

[0008] The driving adjustment module is connected with the inversion detection module and the inversion output module, and is configured to output a fifth detection signal and adjust the working current of the switch element in the negative period when the first inversion signal and the fourth detection signal are received, and output a sixth detection signal and adjust the working current of the switch element in the positive period when the second inversion signal and the fourth detection signal are received.

[0009] The micro control module is connected with the driving adjustment module, and is configured to provide the first inversion signal and the second inversion signal, receive the first detection signal, the second detection signal, the third detection signal, the fifth detection signal and the sixth detection signal, and adjust the duty cycle of the first inversion signal and the second inversion signal and perform constant power control on the inversion output module when the fourth detection signal is received.

[0010] As a further scheme of the present application, the power supply module comprises a power supply unit, a voltage reduction control unit and a driving control unit.

[0011] Preferably, the power supply unit is configured to access the direct current power.

[0012] Preferably, the driving control unit is connected with the micro control module and the inversion detection module, and is configured to output a first control signal when the micro control module does not drive the inversion output module to invert and the first detection signal is received.

[0013] Preferably, the voltage reduction control unit is connected with the power supply unit and the driving control unit, and is configured to receive the first control signal and perform voltage reduction processing on the direct current power.

[0014] As a further scheme of the present application, the inversion detection module comprises a power detection unit and a fault detection unit.

[0015] Preferably, the power detection unit is connected with the micro control module, the power supply module and the inversion output module, and is configured to set an overvoltage threshold, perform overvoltage judgment and output the first detection signal when the direct current power is greater than the overvoltage threshold, perform current detection on the switch element in the negative period of the inversion output module and output the second detection signal when the first inversion signal is received, and perform current detection on the switch element in the positive period of the inversion output module and output the third detection signal when the second inversion signal is received.

[0016] Preferably, the fault detection unit is connected with the power detection unit, and is configured to set an overcurrent threshold and output the fourth detection signal when the second detection signal or the third detection signal is greater than the overcurrent threshold.

[0017] As a further scheme of the present application, the power supply unit comprises a power supply port and a first capacitor, and the voltage reduction control unit comprises a fifth power tube and a first resistor.

[0018] Preferably, the first end of the power port is connected to the drain of the fifth power tube and the second end of the power port and one end of the first resistor are connected through the first capacitor, the other end of the first resistor is connected to the source of the fifth power tube, and the gate of the fifth power tube is connected to the drive control unit.

[0019] As a further scheme of the present application: the inverter output module comprises a first power tube, a first diode, a second power tube, a second diode, a third power tube, a third diode, a fourth power tube, a fourth diode, and an output port; the micro control module comprises a first controller;

[0020] Preferably, the drain of the first power tube is connected to the drain of the fourth power tube and the first end of the power port, the source of the first power tube is connected to the drain of the second power tube and one end of the output port, the source of the fourth power tube is connected to the other end of the output port and the drain of the third power tube, the source of the second power tube is connected to the source of the third power tube and the second end of the power port, the gate of the first power tube, the gate of the second power tube, the gate of the third power tube, and the gate of the fourth power tube are respectively connected to the cathode of the first diode, the cathode of the second diode, the cathode of the third diode, and the cathode of the fourth diode, and the anode of the first diode, the anode of the second diode, the anode of the third diode, and the anode of the fourth diode are respectively connected to the IO1 end, the IO2 end, the IO3 end, and the IO4 end of the first controller.

[0021] As a further scheme of the present application: the electric energy detection unit comprises a fifth diode, an eighth resistor, a sixth diode, a fifth resistor, a fourth resistor, a sixth resistor, a seventh resistor, a first operational amplifier, and a first analog switch;

[0022] Preferably, the cathode of the fifth diode is connected to the drain of the fourth power tube, the anode of the fifth diode is connected to the anode of the sixth diode and the first end of the eighth resistor and connected to the fourth end and the ninth end of the first analog switch through the third resistor, the second end of the eighth resistor is connected to the IO9 end of the first controller and the drive control unit, the cathode of the sixth diode is connected to the non-inverting end of the first operational amplifier and one end of the seventh resistor through the fifth resistor, the other end of the seventh resistor is connected to the output end of the first operational amplifier and the IO5 end of the first controller, the inverting end of the first operational amplifier is connected to one end of the sixth resistor and connected to the other end of the sixth resistor and the ground end through the fourth resistor, the fifth end and the third end of the first analog switch are both connected to the IO1 end of the first controller, and the sixth end and the eighth end of the first analog switch are both connected to the IO4 end of the first controller.

[0023] As a further scheme of the present application: the fault detection unit comprises a first comparator and a first reference power supply;

[0024] The non-inverting terminal of the first comparator is connected with the output terminal of the first operational amplifier, the inverting terminal of the first comparator is connected with the first reference power supply, and the output terminal of the first comparator is connected with the IO6 terminal of the first controller and the driving adjustment module.

[0025] As a further scheme of the present application, the driving control unit comprises a first logic device, a second logic device and a self-locking device.

[0026] Preferably, the A terminal and the B terminal of the first logic device are connected with the IO1 terminal and the IO4 terminal of the first controller respectively, the Y terminal of the first logic device is connected with the B terminal of the second logic device, the A terminal of the second logic device is connected with the second terminal of the eighth resistor, the Y terminal of the second logic device is connected with the input terminal of the self-locking device, and the output terminal of the self-locking device is connected with the gate of the fifth power transistor.

[0027] As a further scheme of the present application, the driving adjustment module comprises a first switch transistor, a second switch transistor, a ninth resistor, a tenth resistor and a fourth logic device.

[0028] Preferably, the collector of the first switch transistor and the collector of the second switch transistor are connected with the gate of the third power transistor and the gate of the first power transistor respectively, the emitter of the first switch transistor is connected with one end of the tenth resistor and the ground terminal through the ninth resistor, the other end of the tenth resistor is connected with the emitter of the second switch transistor, the base of the first switch transistor is connected with the base of the second switch transistor, the IO7 terminal of the first controller and the Y terminal of the fourth logic device, the B terminal of the fourth logic device is connected with the IO1 terminal of the first controller, and the A terminal of the fourth logic device is connected with the output terminal of the first comparator.

[0029] As a further scheme of the present application, the driving adjustment module further comprises a third switch transistor, a fourth switch transistor, an eleventh resistor, a second resistor and a third logic device.

[0030] Preferably, the collector of the third switch transistor and the collector of the fourth switch transistor are connected with the gate of the second power transistor and the gate of the fourth power transistor respectively, the emitter of the third switch transistor is connected with one end of the second resistor and the ground terminal through the eleventh resistor, the other end of the second resistor is connected with the emitter of the fourth switch transistor, the base of the third switch transistor is connected with the base of the fourth switch transistor, the IO8 terminal of the first controller and the Y terminal of the third logic device, the A terminal and the B terminal of the third logic device are connected with the output terminal of the first comparator and the IO4 terminal of the first controller respectively.

[0031] Compared with the prior art, the beneficial effects of the present application are that the intelligent switch driving control circuit can drive the positive period switch element and the negative period switch element of the inverter output module by the micro control module, and the DC power connected to the power module is inverter processed, when the inverter is not working, the overvoltage detection of the power module is performed by the inverter detection module according to the set overvoltage threshold, and when the overvoltage occurs, the power module is controlled to perform the voltage division processing, when the inverter is working, the current detection and overcurrent judgment of the positive period switch element or the negative period switch element are performed by the inverter detection module according to the inverter state and the set overcurrent threshold, and when the overcurrent of the positive period switch element occurs, the working current of the positive period switch element is adjusted, when the overcurrent of the negative period switch element occurs, the working current of the negative period switch element is adjusted, the inverter efficiency and the driving safety of the switch element are improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0033] Figure 1 A principle block diagram of an intelligent switch driving control circuit provided by the embodiments of the present application is shown.

[0034] Figure 2 A principle block diagram of a power module provided by the embodiments of the present application is shown.

[0035] Figure 3 A principle block diagram of an inverter detection module provided by the embodiments of the present application is shown.

[0036] Figure 4 A circuit diagram of an intelligent switch driving control circuit provided by the embodiments of the present application is shown.

[0037] Figure 5 A circuit diagram of a fault detection unit provided by the embodiments of the present application is shown.

[0038] Figure 6 A circuit diagram of a driving control unit provided by the embodiments of the present application is shown.

[0039] Figure 7 A circuit diagram of a driving adjustment module provided by the embodiments of the present application is shown. DETAILED DESCRIPTION

[0040] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

[0041] In one embodiment, please refer to Figure 1 、 Figure 2 and Figure 3 An intelligent switch driving control circuit comprises:

[0042] The power module 1 is connected with the micro-control module 4 and the inversion detection module 3, used for accessing direct current power, performing voltage division on the direct current power when the micro-control module 4 does not drive the inversion output module 2 to invert and the inversion detection module 3 detects that the direct current power is overvoltage;

[0043] The inversion output module 2 is connected with the power module 1 and the micro-control module 4, used for receiving the first inversion signal and the second inversion signal output by the micro-control module 4 and driving the switch element in the negative cycle and the switch element in the positive cycle to invert the direct current power respectively;

[0044] The inversion detection module 3 is connected with the micro-control module 4 and the inversion output module 2, used for setting an overcurrent threshold and an overvoltage threshold, performing overvoltage judgment and outputting a first detection signal when the direct current power is greater than the overvoltage threshold, performing current detection on the switch element in the negative cycle of the inversion output module 2 and outputting a second detection signal when the first inversion signal is received, performing current detection on the switch element in the positive cycle of the inversion output module 2 and outputting a third detection signal when the second inversion signal is received, comparing the overcurrent threshold with the voltage of the second detection signal or the third detection signal, and outputting a fourth detection signal when the second detection signal or the third detection signal is greater than the overcurrent threshold;

[0045] The driving adjustment module 5 is connected with the inversion detection module 3 and the inversion output module 2, used for outputting a fifth detection signal and adjusting the working current of the switch element in the negative cycle when the first inversion signal and the fourth detection signal are received, and outputting a sixth detection signal and adjusting the working current of the switch element in the positive cycle when the second inversion signal and the fourth detection signal are received;

[0046] The micro-control module 4 is connected with the driving adjustment module 5, used for providing the first inversion signal and the second inversion signal, receiving the first detection signal, the second detection signal, the third detection signal, the fifth detection signal and the sixth detection signal, adjusting the duty cycle of the first inversion signal and the second inversion signal and performing constant power control on the inversion output module 2 when the fourth detection signal is received.

[0047] In specific embodiments, the power supply module 1 can adopt a power supply circuit composed of a power supply port, a field effect tube, a logic device, etc., can access direct current power, detect whether the micro control module 4 is in inverter driving, and when the inverter detection module 3 detects overvoltage without inverter operation, divide the direct current power; the inverter output module 2 can adopt an inverter output circuit composed of a field effect tube, a diode and an output port, can perform inverter adjustment and power output; the inverter detection module 3 can adopt an inverter detection circuit composed of a diode, an operational amplifier, a comparator, etc., can set an overvoltage threshold and an overcurrent threshold, detect the overvoltage of the direct current power, according to the inverter state, detect the current of the positive period switch element or the negative period switch element of the inverter output module 2, and compare the signal obtained by the current detection with the current threshold voltage, and then judge the overcurrent; the micro control module 4 can adopt a micro control circuit composed of a single chip microcomputer, integrates many components such as an arithmetic unit, a controller, a memory and an input-output device, realizes signal processing, data storage, module control, timing control and other functions; the driving adjustment module 5 can adopt a driving adjustment circuit composed of a resistor, a triode and a logic chip, can adjust the driving state of the positive period switch element or the negative period switch element according to the overcurrent state of the positive period switch element and the negative period switch element, and then adjust the working current of the positive period switch element or the negative period switch element.

[0048] Further, the power supply module 1 includes a power supply unit 101, a voltage reduction control unit 102 and a driving control unit 103.

[0049] Specifically, the power supply unit 101 is used for accessing direct current power.

[0050] Specifically, the driving control unit 103 is connected with the micro control module 4 and the inverter detection module 3, and is used for outputting a first control signal when the micro control module 4 does not drive the inverter output module 2 and receives a first detection signal.

[0051] Specifically, the voltage reduction control unit 102 is connected with the power supply unit 101 and the driving control unit 103, and is used for receiving the first control signal and dividing the direct current power.

[0052] Further, the inverter detection module 3 includes a power detection unit 301 and a fault detection unit 302.

[0053] Specifically, the electric energy detection unit 301 is connected with the micro control module 4, the power supply module 1 and the inverter output module 2, for setting an overvoltage threshold, and when the direct current electric energy is greater than the overvoltage threshold, performing overvoltage judgment and outputting a first detection signal, when receiving a first inverter signal, performing current detection on the switching element of the inverter output module 2 in the negative period and outputting a second detection signal, and when receiving a second inverter signal, performing current detection on the switching element of the inverter output module 2 in the positive period and outputting a third detection signal.

[0054] Specifically, the fault detection unit 302 is connected with the electric energy detection unit 301, for setting an overcurrent threshold, and when the second detection signal or the third detection signal is greater than the overcurrent threshold, outputting a fourth detection signal.

[0055] In another embodiment, please refer to Figure 4 、 Figure 5 、 Figure 6 and Figure 7 , the power supply unit 101 includes a power supply port and a first capacitor C1; the step-down control unit 102 includes a fifth power tube Q5 and a first resistor R1;

[0056] Specifically, the first end of the power supply port is connected with the drain of the fifth power tube Q5, and the second end of the power supply port and one end of the first resistor R1 are connected through the first capacitor C1, the other end of the first resistor R1 is connected with the source of the fifth power tube Q5, and the gate of the fifth power tube Q5 is connected with the drive control unit 103.

[0057] In a specific embodiment, the above-mentioned fifth power tube Q5 can be selected as an N-channel field effect tube, and the voltage division processing is performed in cooperation with the first resistor R1.

[0058] Further, the inverter output module 2 includes a first power tube Q1, a first diode D1, a second power tube Q2, a second diode D2, a third power tube Q3, a third diode D3, a fourth power tube Q4, a fourth diode D4 and an output port; the micro control module 4 includes a first controller U1;

[0059] Specifically, the drain of the first power tube Q1 is connected with the drain of the fourth power tube Q4 and the first end of the power port, the source of the first power tube Q1 is connected with the drain of the second power tube Q2 and one end of the output port, the source of the fourth power tube Q4 is connected with the other end of the output port and the drain of the third power tube Q3, the source of the second power tube Q2 is connected with the source of the third power tube Q3 and the second end of the power port, the gate of the first power tube Q1, the gate of the second power tube Q2, the gate of the third power tube Q3 and the gate of the fourth power tube Q4 are respectively connected with the cathode of the first diode D1, the cathode of the second diode D2, the cathode of the third diode D3 and the cathode of the fourth diode D4, the anode of the first diode D1, the anode of the second diode D2, the anode of the third diode D3 and the anode of the fourth diode D4 are respectively connected with the IO1 end, the IO2 end, the IO3 end and the IO4 end of the first controller U1.

[0060] In specific embodiments, the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 can all be N-channel field effect tubes, wherein the first power tube Q1 and the third power tube Q3 are used as switching elements of negative cycle, and the second power tube Q2 and the fourth power tube Q4 are used as switching elements of positive cycle; the first controller U1 can be an STM32 single-chip microcomputer.

[0061] Further, the electric energy detection unit 301 comprises a fifth diode D5, an eighth resistor R8, a sixth diode D6, a fifth resistor R5, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, a first operational amplifier OP1 and a first analog switch U2.

[0062] Specifically, the cathode of the fifth diode D5 is connected with the drain of the fourth power tube Q4, the anode of the fifth diode D5 is connected with the anode of the sixth diode D6 and the first end of the eighth resistor R8 and connected with the fourth end and the ninth end of the first analog switch U2 through the third resistor, the second end of the eighth resistor R8 is connected with the IO9 end of the first controller U1 and the driving control unit 103, the cathode of the sixth diode D6 is connected with the non-inverting end of the first operational amplifier OP1 and one end of the seventh resistor R7 through the fifth resistor R5, the other end of the seventh resistor R7 is connected with the output end of the first operational amplifier OP1 and the IO5 end of the first controller U1, the inverting end of the first operational amplifier OP1 is connected with one end of the sixth resistor R6 and connected with the other end of the sixth resistor R6 and the ground end through the fourth resistor R4, the fifth end and the third end of the first analog switch U2 are both connected with the IO1 end of the first controller U1, the sixth end and the eighth end of the first analog switch U2 are both connected with the IO4 end of the first controller U1.

[0063] In specific embodiments, the first operational amplifier OP1 can be an OP07 operational amplifier, which is used for differential processing in cooperation with the fifth resistor R5, the fourth resistor R4, the sixth resistor R6 and the seventh resistor R7; the first analog switch U2 can be a CD4066 chip, which is used for current sampling in cooperation with the sixth diode D6, the third resistor and the fifth diode D5; the fifth diode D5 cooperates with the eighth resistor R8 to set an overvoltage threshold, which is the maximum working voltage of the inverter output module 2.

[0064] Further, the fault detection unit 302 includes a first comparator A1 and a first reference power supply VF1.

[0065] Specifically, the non-inverting terminal of the first comparator A1 is connected to the output terminal of the first operational amplifier OP1, the inverting terminal of the first comparator A1 is connected to the first reference power supply VF1, and the output terminal of the first comparator A1 is connected to the IO6 terminal of the first controller U1 and the drive adjustment module 5.

[0066] In specific embodiments, the first reference power supply VF1 can set an overcurrent threshold, which is the maximum working current of the inverter output module 2; the first comparator A1 can be an LM358 comparator.

[0067] Further, the drive control unit 103 includes a first logic J1, a second logic J2 and a self-locking device.

[0068] Specifically, the A terminal and the B terminal of the first logic J1 are connected to the IO1 terminal and the IO4 terminal of the first controller U1, respectively, the Y terminal of the first logic J1 is connected to the B terminal of the second logic J2, the A terminal of the second logic J2 is connected to the second terminal of the eighth resistor R8, the Y terminal of the second logic J2 is connected to the input terminal of the self-locking device, and the output terminal of the self-locking device is connected to the gate of the fifth power tube Q5.

[0069] In specific embodiments, the first logic J1 can be an OR gate; the second logic J2 can be an AND gate; and the self-locking device can be composed of a transistor and a resistor, which performs self-locking processing on the input high-level signal.

[0070] Further, the drive adjustment module 5 includes a first switch tube V1, a second switch tube V2, a ninth resistor R9, a tenth resistor R10 and a fourth logic J4.

[0071] Specifically, the collector of the first switch tube V1 and the collector of the second switch tube V2 are connected to the gate of the third power tube Q3 and the gate of the first power tube Q1 respectively, the emitter of the first switch tube V1 is connected to one end of the tenth resistor R10 and the ground through the ninth resistor R9, the other end of the tenth resistor R10 is connected to the emitter of the second switch tube V2, the base of the first switch tube V1 is connected to the base of the second switch tube V2, the IO7 terminal of the first controller U1 and the Y terminal of the fourth logic J4, the B terminal of the fourth logic J4 is connected to the IO1 terminal of the first controller U1, and the A terminal of the fourth logic J4 is connected to the output terminal of the first comparator A1.

[0072] In specific embodiments, the first switch tube V1 and the second switch tube V2 can be NPN type triodes.

[0073] Further, the drive adjustment module 5 further comprises a third switch tube V3, a fourth switch tube V4, an eleventh resistor R11, a second resistor R2 and a third logic J3.

[0074] Specifically, the collector of the third switch tube V3 and the collector of the fourth switch tube V4 are connected to the gate of the second power tube Q2 and the gate of the fourth power tube Q4 respectively, the emitter of the third switch tube V3 is connected to one end of the second resistor R2 and the ground through the eleventh resistor R11, the other end of the second resistor R2 is connected to the emitter of the fourth switch tube V4, the base of the third switch tube V3 is connected to the base of the fourth switch tube V4, the IO8 terminal of the first controller U1 and the Y terminal of the third logic J3, the A terminal and the B terminal of the third logic J3 are connected to the output terminal of the first comparator A1 and the IO4 terminal of the first controller U1 respectively.

[0075] In specific embodiments, the third switch tube V3 and the fourth switch tube V4 can be NPN type triodes, and the third logic J3 can be an AND gate.

[0076] In the intelligent switch driving control circuit of the embodiment, DC power is accessed through the power port, and the first capacitor C1 performs filtering. When no inverter operation is performed, the Y terminal of the first logic device J1 outputs a high level. At this time, if the DC power is greater than the overvoltage threshold set by the fifth diode D5 and the eighth resistor R8, the Y terminal of the second logic device J2 will output a high level and be self-locked by the self-locking device, controlling the fifth power tube Q5 to be turned on, cooperating with the first resistor R1 to perform voltage division processing, reducing the voltage of the DC power, and performing inverter operation. When the inverter operation is performed, the IO4 terminal and the IO2 terminal of the first controller U1 output the second inverter signal to control the second power tube Q2 and the fourth power tube Q4 to be turned on, performing positive cycle inverter processing. The IO1 terminal and the IO3 terminal of the first controller U1 output the first inverter signal to control the first power tube Q1 and the third power tube Q3 to be turned on, performing negative cycle inverter processing, and supplying power to the electronic device connected to the output port. When the negative cycle inverter is performed, the third terminal and the fourth terminal of the first analog switch U2 are turned on, so that the signal output by the IO1 terminal of the first controller U1 is transmitted to the anode of the fifth diode D5 through the first analog switch U2. Since the cathode of the fifth diode D5 is connected to the drain of the first power tube Q1, the anode voltage of the fifth diode D5 corresponds to the sampling voltage value when the current passes through the first power tube Q1. The voltage value is transmitted through the sixth diode D6, and after offsetting the voltage drop of the fifth diode D5, the voltage value is subjected to differential amplification conditioning by the fifth resistor R5, the fourth resistor R4, the sixth resistor R6, the seventh resistor R7, and the first operational amplifier OP1, and the second detection signal is output. Similarly, when the positive cycle inverter is performed, the current of the fourth power tube Q4 is detected and the third detection signal is output by the first operational amplifier OP1. When the second detection signal or the third detection signal is greater than the overcurrent threshold set by the first reference power source VF1, the first comparator A1 outputs the fourth detection signal. During the period when the second detection signal is greater than the overcurrent threshold, the IO1 terminal of the first controller U1 outputs the first inverter signal, so that the fourth logic device J4 triggers the first switch tube V1 and the second switch tube V2 to be turned on, thereby reducing the gate voltage of the first power tube Q1 and the third power tube Q3, reducing the working current of the first power tube Q1 and the third power tube Q3, and being received by the IO7 terminal of the first controller U1, so that the first controller U1 adjusts the duty cycle of the first inverter signal to perform constant power regulation on the first power tube Q1 and the third power tube Q3. Similarly, when the third detection signal is greater than the overcurrent threshold, the third logic device J3 triggers the third switch tube V3 and the fourth switch tube V4 to be turned on, thereby reducing the working current of the second power tube Q2 and the fourth power tube Q4, and being received by the IO8 terminal of the first controller U1, so that the first controller U1 adjusts the duty cycle of the second inverter signal to perform constant power regulation on the second power tube Q2 and the fourth power tube Q4.

[0077] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0078] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. An intelligent switch drive control circuit, characterized by, The circuit comprises: The power module is connected with the micro-control module and the inversion detection module, is used for accessing the direct-current power, and performs voltage division on the direct-current power when the micro-control module does not drive the inversion output module to invert and the inversion detection module detects that the direct-current power is overvoltage; The inversion output module is connected with the power module and the micro-control module, is used for receiving the first inversion signal and the second inversion signal output by the micro-control module and driving the switch element in the negative cycle and the switch element in the positive cycle to invert the direct-current power respectively; The inversion detection module is connected with the micro-control module and the inversion output module, is used for setting an overcurrent threshold and an overvoltage threshold, performing overvoltage judgment and outputting a first detection signal when the direct-current power is greater than the overvoltage threshold, performing current detection on the switch element in the negative cycle of the inversion output module and outputting a second detection signal when the first inversion signal is received, performing current detection on the switch element in the positive cycle of the inversion output module and outputting a third detection signal when the second inversion signal is received, comparing the overcurrent threshold with the voltage of the second detection signal or the third detection signal, and outputting a fourth detection signal when the second detection signal or the third detection signal is greater than the overcurrent threshold; The drive adjustment module is connected with the inversion detection module and the inversion output module, is used for outputting a fifth detection signal and adjusting the working current of the switch element in the negative cycle when the first inversion signal and the fourth detection signal are received, and outputting a sixth detection signal and adjusting the working current of the switch element in the positive cycle when the second inversion signal and the fourth detection signal are received; The micro-control module is connected with the drive adjustment module, is used for providing the first inversion signal and the second inversion signal, receiving the first detection signal, the second detection signal, the third detection signal, the fifth detection signal and the sixth detection signal, adjusting the duty cycle of the first inversion signal and the second inversion signal and performing constant-power control on the inversion output module when the fourth detection signal is received.

2. The intelligent switch driving control circuit according to claim 1, wherein, The power module comprises a power supply unit, a voltage reduction control unit and a drive control unit; The power supply unit is used for accessing the direct-current power; The drive control unit is connected with the micro-control module and the inversion detection module, is used for outputting a first control signal when the micro-control module does not drive the inversion output module to invert and the first detection signal is received; The voltage reduction control unit is connected with the power supply unit and the drive control unit, is used for receiving the first control signal and performing voltage division on the direct-current power.

3. The intelligent switch driving control circuit according to claim 2, wherein, The inversion detection module comprises a power detection unit and a fault detection unit; The power detection unit is connected with the micro-control module, the power module and the inversion output module, is used for setting an overvoltage threshold and performing overvoltage judgment and outputting a first detection signal when the direct-current power is greater than the overvoltage threshold, performing current detection on the switch element in the negative cycle of the inversion output module and outputting a second detection signal when the first inversion signal is received, and performing current detection on the switch element in the positive cycle of the inversion output module and outputting a third detection signal when the second inversion signal is received; The fault detection unit is connected with the electric energy detection unit, and is configured to set an overcurrent threshold value, and output a fourth detection signal when the second detection signal or the third detection signal is greater than the overcurrent threshold value.

4. The intelligent switch driving control circuit according to claim 3, wherein, The power supply unit comprises a power port and a first capacitor; and the step-down control unit comprises a fifth power tube and a first resistor. The first end of the power port is connected to the drain of the fifth power tube, and the second end of the power port and one end of the first resistor are connected through the first capacitor; the other end of the first resistor is connected to the source of the fifth power tube; and the gate of the fifth power tube is connected to the drive control unit.

5. The intelligent switch driving control circuit according to claim 4, wherein, The inverter output module comprises a first power tube, a first diode, a second power tube, a second diode, a third power tube, a third diode, a fourth power tube, a fourth diode and an output port; and the micro control module comprises a first controller. The drain of the first power tube is connected to the drain of the fourth power tube and the first end of the power port; the source of the first power tube is connected to the drain of the second power tube and one end of the output port; the source of the fourth power tube is connected to the other end of the output port and the drain of the third power tube; the source of the second power tube is connected to the source of the third power tube and the second end of the power port; the gates of the first power tube, the second power tube, the third power tube and the fourth power tube are respectively connected to the cathodes of the first diode, the second diode, the third diode and the fourth diode; and the anodes of the first diode, the second diode, the third diode and the fourth diode are respectively connected to the IO1 end, the IO2 end, the IO3 end and the IO4 end of the first controller.

6. The intelligent switch drive control circuit of claim 5, wherein, The electric energy detection unit comprises a fifth diode, an eighth resistor, a sixth diode, a third resistor, a fifth resistor, a fourth resistor, a sixth resistor, a seventh resistor, a first operational amplifier and a first analog switch. The cathode of the fifth diode is connected to the drain of the fourth power tube; the anode of the fifth diode is connected to the anode of the sixth diode and the first end of the eighth resistor, and is connected to the fourth end and the ninth end of the first analog switch through the third resistor; the second end of the eighth resistor is connected to the IO9 end of the first controller and the drive control unit; the cathode of the sixth diode is connected to the non-inverting end of the first operational amplifier and one end of the seventh resistor through the fifth resistor; the other end of the seventh resistor is connected to the output end of the first operational amplifier and the IO5 end of the first controller; the inverting end of the first operational amplifier is connected to one end of the sixth resistor and the other end of the sixth resistor and the ground end through the fourth resistor; the fifth end and the third end of the first analog switch are both connected to the IO1 end of the first controller; and the sixth end and the eighth end of the first analog switch are both connected to the IO4 end of the first controller.

7. The intelligent switch drive control circuit of claim 6, wherein, The fault detection unit comprises a first comparator and a first reference power supply. The non-inverting end of the first comparator is connected to the output end of the first operational amplifier; the inverting end of the first comparator is connected to the first reference power supply; and the output end of the first comparator is connected to the IO6 end of the first controller and the drive adjustment module.

8. The intelligent switch driving control circuit according to claim 6, wherein, The drive control unit comprises a first logic device, a second logic device and a self-locking device; the first logic device is selected from an or gate; and the second logic device is selected from an and gate. The A end and the B end of the first logic device are connected to the IO1 end and the IO4 end of the first controller respectively, the Y end of the first logic device is connected to the B end of the second logic device, the A end of the second logic device is connected to the second end of the eighth resistor, the Y end of the second logic device is connected to the input end of the self-locking device, and the output end of the self-locking device is connected to the gate of the fifth power tube.

9. The intelligent switch drive control circuit of claim 7, wherein, The driving adjustment module comprises a first switch tube, a second switch tube, a ninth resistor, a tenth resistor and a fourth logic device; The collector of the first switch tube and the collector of the second switch tube are connected to the gate of the third power tube and the gate of the first power tube respectively, the emitter of the first switch tube is connected to one end of the tenth resistor and the ground end through the ninth resistor, the other end of the tenth resistor is connected to the emitter of the second switch tube, the base of the first switch tube is connected to the base of the second switch tube, the IO7 end of the first controller and the Y end of the fourth logic device, the B end of the fourth logic device is connected to the IO1 end of the first controller, and the A end of the fourth logic device is connected to the output end of the first comparator.

10. The intelligent switch drive control circuit of claim 9, wherein, The driving adjustment module further comprises a third switch tube, a fourth switch tube, an eleventh resistor, a second resistor and a third logic device; The collector of the third switch tube and the collector of the fourth switch tube are connected to the gate of the second power tube and the gate of the fourth power tube respectively, the emitter of the third switch tube is connected to one end of the second resistor and the ground end through the eleventh resistor, the other end of the second resistor is connected to the emitter of the fourth switch tube, the base of the third switch tube is connected to the base of the fourth switch tube, the IO8 end of the first controller and the Y end of the third logic device, and the A end and the B end of the third logic device are connected to the output end of the first comparator and the IO4 end of the first controller respectively.

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