A frequency converter intelligent drive control circuit

Abstract

The utility model discloses a frequency converter intelligent drive control circuit, which relates to the technical field of frequency converters, including a power module for power supply; a drive control module for amplifying and processing the connected signal; a drive detection module for detecting whether the drive control module outputs the signal normally; a standby drive module for signal transmission and providing a standby drive signal; a drive control protection module for amplifying and processing the connected signal, detecting whether the signal is output normally, and performing signal transmission and providing a standby drive signal; a frequency conversion module for receiving the signal output by the standby drive module and the drive control protection module and performing frequency conversion work, and an output module for receiving the electric energy output by the frequency conversion module after frequency conversion. After the frequency conversion starts, the utility model frequency converter intelligent drive control circuit ensures the completion of the frequency conversion work and improves the frequency conversion work efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency converters, in particular to an intelligent drive control circuit for a frequency converter. Background Art

[0002] The variable-frequency drive (VFD) is a power control device that uses frequency conversion technology and microelectronics technology to control the AC motor by changing the working power frequency of the motor. In order to improve the driving ability of the inverter, the microcontroller in the prior art will use an inverter drive control circuit. The inverter drive control circuit generally uses a push-pull circuit composed of triodes to improve the driving ability of the drive signal output by the microcontroller. However, when a short circuit occurs in the push-pull circuit, signal transmission and signal processing cannot be performed normally, which in turn leads to the inability to control the inverter's inversion work normally, reducing the user experience of the inverter, and therefore needs to be improved. Utility Model Content

[0003] The embodiment of the utility model provides an inverter intelligent drive control circuit to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] An inverter intelligent drive control circuit comprises: a power supply module, a drive control module, a drive detection module, a standby drive module, a drive control protection module, a frequency conversion module and an output module;

[0006] A power module is used to receive working power and perform rectification and filtering on the working power;

[0007] A drive control module, used for receiving a first pulse signal, amplifying the first drive signal and outputting the first drive signal;

[0008] A drive detection module, connected to the drive control module, configured to perform isolation detection on the first pulse signal and the first drive signal, and output a first control signal when the first pulse signal is received but the first drive signal is not received;

[0009] A standby driving module, connected to the driving control module, the driving detection module and the frequency conversion module, for transmitting the first driving signal to the frequency conversion module, amplifying the first pulse signal and outputting the first standby driving signal, and upon receiving the first control signal, transmitting the first standby driving signal to the frequency conversion module and stopping the transmission of the first driving signal;

[0010] a drive control protection module, used for amplifying the second pulse signal received and outputting the second drive signal and the second standby drive signal, amplifying the third pulse signal received and outputting the third drive signal and the third standby drive signal, amplifying the fourth pulse signal received and outputting the fourth drive signal and the fourth standby drive signal, transmitting the second drive signal, the third drive signal and the fourth drive signal to the frequency conversion module, transmitting the second standby drive signal to the frequency conversion module when the second pulse signal is received but the second drive signal is not received, transmitting the third standby drive signal to the frequency conversion module when the third pulse signal is received but the third drive signal is not received, and transmitting the fourth standby drive signal to the frequency conversion module when the fourth pulse signal is received but the fourth drive signal is not received;

[0011] A frequency conversion module, connected to the power module and the drive control protection module, used to receive the first drive signal or the first standby drive signal, receive the second drive signal or the second standby drive signal, receive the third drive signal or the third standby drive signal, receive the fourth drive signal or the fourth standby drive signal, and perform frequency conversion;

[0012] The output module is connected to the frequency conversion module and is used to receive the electric energy output by the frequency conversion module after frequency conversion.

[0013] As a further solution of the utility model: the power module includes a power input port, a first rectifier and a first capacitor; the frequency conversion module includes a first power tube, a second power tube, a third power tube and a fourth power tube; the output module includes an output port;

[0014] Preferably, the first end and the second end of the power input port are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to one end of the first capacitor, the collector of the first power tube and the collector of the third power tube, the emitter of the first power tube is connected to the collector of the second power tube and one end of the output port, the emitter of the third power tube is connected to the collector of the fourth power tube and the other end of the output port, the fourth end of the first rectifier is connected to the other end of the first capacitor, the emitter of the second power tube and the emitter of the fourth power tube, the gate of the first power tube is connected to the standby drive module, and the second power tube, the third power tube and the fourth power tube are connected to the drive control protection module.

[0015] As a further solution of the utility model: the standby driving module includes a first analog switch; the driving control module includes a signal interface, a sixth resistor, a seventh resistor, a third power supply, a second switch tube, a third switch tube, a second capacitor, an eighth resistor and a first diode;

[0016] Preferably, the output end of the signal interface is connected to one end of the seventh resistor, the collector of the second switch tube, the base of the third switch tube, one end of the second capacitor, the other end of the seventh resistor, the other end of the second capacitor and the emitter of the third switch tube through the sixth resistor, and the emitter of the second switch tube is connected to the third power supply, the base of the second switch tube is connected to the collector of the third switch tube and the cathode of the first diode and is connected to the anode of the first diode and the third end of the first analog switch through the eighth resistor, and the fourth end and the ninth end of the first analog switch are both connected to the gate of the first power tube.

[0017] As a further solution of the utility model: the backup driving module also includes a first backup device, a fifth resistor, a second power supply and a first switch tube;

[0018] Preferably, the input end of the first backup device is connected to the output end of the signal interface, the output end of the first backup device is connected to the fifth end of the first analog switch, the second power supply is connected to the fifth end of the first analog switch and the collector of the first switch tube through the fifth resistor, the emitter of the first switch tube is grounded, and the base of the first switch tube is connected to the sixth end of the first analog switch and the drive detection module.

[0019] As a further solution of the utility model: the driving detection module includes a first resistor, a first logic chip, a first optical coupler, a first power supply, a second resistor, a third resistor, a fourth resistor and a second optical coupler;

[0020] Preferably, the first end of the first optocoupler is connected to the output end of the signal interface through the first resistor, the second end of the first optocoupler and the second end of the second optocoupler are both grounded, the third end of the first optocoupler is connected to the first power supply and connected to the second end of the second optocoupler and the B end of the first logic chip through the fourth resistor, the fourth end of the first optocoupler is connected to the A end of the first logic chip and grounded through the second resistor, the fourth end of the second optocoupler is grounded, and the F end of the first logic chip is connected to the base of the first switching tube.

[0021] As a further solution of the utility model: the drive control protection module includes a first drive device, a second drive device and a third drive device;

[0022] Preferably, the output end of the first driving device is connected to the gate of the second power tube, the output end of the second driving device is connected to the gate of the third power tube, and the output end of the third driving device is connected to the gate of the fourth power tube.

[0023] Compared with the prior art, the beneficial effects of the utility model are as follows: the intelligent drive control circuit of the frequency converter of the utility model improves the driving ability of the signal by the drive control module and the drive control protection module, so that the drive control of the frequency conversion module can be completed after completion. At the same time, the standby drive module and the drive control protection module can provide standby drive signals, so that when the drive detection module detects that the signal transmission cannot be performed normally, the standby drive signal is controlled to complete the drive control of the frequency conversion module, complete the frequency conversion work, and improve the frequency conversion work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The present invention provides a schematic block diagram of a frequency converter intelligent drive control circuit.

[0026] Figure 2 A circuit diagram of a frequency converter intelligent drive control circuit provided in an example of the utility model.

[0027] Figure 3 This is a connection circuit diagram of a drive control module provided for an example of the utility model. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In one embodiment, see Figure 1 , an inverter intelligent drive control circuit, comprising: a power supply module 1, a drive control module 2, a drive detection module 3, a standby drive module 4, a drive control protection module 5, a frequency conversion module 6 and an output module 7;

[0030] Specifically, the power module 1 is used to receive the working power and perform rectification and filtering on the working power;

[0031] The drive control module 2 is used to receive the first pulse signal, amplify the first drive signal and output the first drive signal;

[0032] A drive detection module 3, connected to the drive control module 2, for isolating and detecting the first pulse signal and the first drive signal, and outputting a first control signal when the first pulse signal is received but the first drive signal is not received;

[0033] The standby drive module 4 is connected to the drive control module 2, the drive detection module 3 and the frequency conversion module 6, and is used to transmit the first drive signal to the frequency conversion module 6, amplify the first pulse signal and output the first standby drive signal, and when receiving the first control signal, transmit the first standby drive signal to the frequency conversion module 6 and stop transmitting the first drive signal;

[0034] The drive control protection module 5 is used to amplify the second pulse signal received and output the second drive signal and the second standby drive signal, amplify the third pulse signal received and output the third drive signal and the third standby drive signal, amplify the fourth pulse signal received and output the fourth drive signal and the fourth standby drive signal, transmit the second drive signal, the third drive signal and the fourth drive signal to the frequency conversion module 6, and transmit the second standby drive signal to the frequency conversion module 6 when the second pulse signal is received but the second drive signal is not received, and transmit the third standby drive signal to the frequency conversion module 6 when the third pulse signal is received but the third drive signal is not received, and transmit the fourth standby drive signal to the frequency conversion module 6 when the fourth pulse signal is received but the fourth drive signal is not received;

[0035] The frequency conversion module 6 is connected to the power module 1 and the drive control protection module 5, and is used to receive the first drive signal or the first standby drive signal, receive the second drive signal or the second standby drive signal, receive the third drive signal or the third standby drive signal, receive the fourth drive signal or the fourth standby drive signal, and perform frequency conversion;

[0036] The output module 7 is connected to the frequency conversion module 6 and is used to receive the electric energy output by the frequency conversion module 6 after frequency conversion.

[0037] In a specific embodiment, the power supply module 1 can adopt a power supply circuit composed of a power access port, a rectifier and a capacitor, can access working power, that is, AC power, and rectify and filter the working power; the drive control module 2 can adopt a drive control circuit composed of a signal interface, a transistor, a resistor, etc., and the signal interface receives a first pulse signal, and the first pulse signal can be generated by an STM32 single-chip microcomputer, and the first pulse signal is amplified to meet the driving work; the drive detection module 3 can adopt a drive detection circuit composed of a photocoupler, a power supply and a resistor, which can detect the signal accessed by the drive control module 2 and the signal output by the drive control module 2, and when the drive control module 2 accesses the signal but does not output the signal, control the standby drive module 4 to switch the transmission path of the signal; the standby drive module 4 can adopt the first A backup drive circuit composed of a backup device, an analog switch, a triode, etc., the circuit composition structure of the first backup drive device is the same as the circuit composition structure of the drive control module 2, the input signal is amplified, and then a backup first backup drive signal is provided, and the transmission state of the first backup drive signal and the first drive signal can be controlled; the above-mentioned drive control protection module 5 can adopt a drive control protection circuit composed of a first drive control device, a second drive control device and a third drive control device, all of which can provide a drive signal and a backup drive signal, and determine whether to provide a drive signal. If the drive signal is not provided, the backup drive signal is transmitted to the frequency conversion module 6; the above-mentioned frequency conversion module 6 can adopt a frequency conversion circuit composed of a power tube to perform inversion work; the above-mentioned output module 7 can adopt an output circuit composed of an output port to receive electric energy.

[0038] In another embodiment, see Figure 1 , Figure 2 and Figure 3 The power module 1 includes a power input port, a first rectifier T1 and a first capacitor C1; the frequency conversion module 6 includes a first power tube Q1, a second power tube Q2, a third power tube Q3 and a fourth power tube Q4; the output module 7 includes an output port;

[0039] Specifically, the first end and the second end of the power input port are respectively connected to the first end and the second end of the first rectifier T1, the third end of the first rectifier T1 is connected to one end of the first capacitor C1, the collector of the first power tube Q1 and the collector of the third power tube Q3, the emitter of the first power tube Q1 is connected to the collector of the second power tube Q2 and one end of the output port, the emitter of the third power tube Q3 is connected to the collector of the fourth power tube Q4 and the other end of the output port, the fourth end of the first rectifier T1 is connected to the other end of the first capacitor C1, the emitter of the second power tube Q2 and the emitter of the fourth power tube Q4, the gate of the first power tube Q1 is connected to the standby drive module 4, and the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 are connected to the drive control protection module 5.

[0040] In a specific embodiment, the first power tube Q1 , the second power tube Q2 , the third power tube Q3 and the fourth power tube Q4 may all be IGBTs.

[0041] Further, the backup driving module 4 includes a first analog switch IC1; the driving control module 2 includes a signal interface, a sixth resistor R6, a seventh resistor R7, a third power supply VCC3, a second switch tube V2, a third switch tube V3, a second capacitor C2, an eighth resistor R8 and a first diode D1;

[0042] Specifically, the output end of the signal interface is connected to one end of the seventh resistor R7, the collector of the second switch tube V2, the base of the third switch tube V3, and one end of the second capacitor C2 through the sixth resistor R6, the other end of the seventh resistor R7, the other end of the second capacitor C2, and the emitter of the third switch tube V3 are all grounded, the emitter of the second switch tube V2 is connected to the third power supply VCC3, the base of the second switch tube V2 is connected to the collector of the third switch tube V3 and the cathode of the first diode D1, and is connected to the anode of the first diode D1 and the third end of the first analog switch IC1 through the eighth resistor R8, and the fourth end and the ninth end of the first analog switch IC1 are both connected to the gate of the first power tube Q1.

[0043] In a specific embodiment, the first analog switch IC1 can use a CD4066 chip; the second switch tube V2 can use a PNP transistor, and the third switch tube V3 can use an NPN transistor, and cooperate with the sixth resistor R6, the seventh resistor R7, the third power supply VCC3, the second capacitor C2, the eighth resistor R8 and the first diode D1 to amplify and protect the signal connected to the signal interface; the signal interface can receive the first pulse signal sent by the STM32 microcontroller.

[0044] Furthermore, the backup driving module 4 also includes a first backup device, a fifth resistor R5, a second power supply VCC2 and a first switch tube V1;

[0045] Specifically, the input end of the first backup device is connected to the output end of the signal interface, the output end of the first backup device is connected to the fifth end of the first analog switch IC1, the second power supply VCC2 is connected to the fifth end of the first analog switch IC1 and the collector of the first switch tube V1 through the fifth resistor R5, the emitter of the first switch tube V1 is grounded, and the base of the first switch tube V1 is connected to the sixth end of the first analog switch IC1 and the drive detection module 3.

[0046] In a specific embodiment, the circuit composition structure of the above-mentioned first backup device is the same as the circuit composition structure of the sixth resistor R6, the seventh resistor R7, the third power supply VCC3, the second switch tube V2, the third switch tube V3, the second capacitor C2, the eighth resistor R8 and the first diode D1, and the signal connected to the signal interface is amplified and protected; the above-mentioned first switch tube V1 can be an NPN type transistor.

[0047] Further, the driving detection module 3 includes a first resistor R1, a first logic chip IC2, a first optical coupler J1, a first power supply VCC1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a second optical coupler J2;

[0048] Specifically, the first end of the first optocoupler J1 is connected to the output end of the signal interface through the first resistor R1, the second end of the first optocoupler J1 and the second end of the second optocoupler J2 are both grounded, the third end of the first optocoupler J1 is connected to the first power supply VCC1 and connected to the second end of the second optocoupler J2 and the B end of the first logic chip IC2 through the fourth resistor R4, the fourth end of the first optocoupler J1 is connected to the A end of the first logic chip IC2 and grounded through the second resistor R2, the fourth end of the second optocoupler J2 is grounded, and the F end of the first logic chip IC2 is connected to the base of the first switch tube V1.

[0049] In a specific embodiment, the first optocoupler J1 and the second optocoupler J2 can both be PC817 photoelectric couplers, wherein the first optocoupler J1 detects the signal connected to the signal interface, and the second optocoupler J2 detects the signal output by the drive control module 2; the first logic chip IC2 can be an AND gate chip.

[0050] Further, the driving control protection module 5 includes a first driving device, a second driving device and a third driving device;

[0051] Specifically, the output end of the first driving device is connected to the gate of the second power tube Q2, the output end of the second driving device is connected to the gate of the third power tube Q3, and the output end of the third driving device is connected to the gate of the fourth power tube Q4.

[0052] In a specific embodiment, the circuit composition structure of the second drive device and the circuit composition structure of the third drive device are the same as the circuit composition structure of the first drive device, and the circuit composition structure of the first drive device is the same as the circuit composition structure of the drive detection module 3, the circuit composition structure of the drive control module 2 and the circuit composition structure of the standby drive module 4, and the first drive device, the second drive device and the third drive device can respectively receive the second pulse signal, the third pulse signal and the fourth pulse signal output by the STM32 microcontroller.

[0053] In an inverter intelligent drive control circuit of the present embodiment, working power is connected to the power access port, and the first rectifier T1 and the first capacitor C1 perform rectification and filtering on the working power. When the signal interface receives the first drive signal, the second switch tube V2 cooperates with the third switch tube V3, the third power supply VCC3, the sixth resistor R6, the seventh resistor R7, the second capacitor C2, the eighth resistor R8 and the first diode D1 to amplify and protect the first drive signal and output the first drive signal. At the same time, the second power supply VCC2 triggers the fifth end of the first analog switch IC1 to become a high level through the fifth resistor R5, so that the third end and the fourth end of the first analog switch IC1 are turned on, so that the first drive signal is transmitted to the first power tube Q1 through the first analog switch IC1 to control the conduction state of the first power tube Q1. Similarly, the first standby device amplifies and protects the first pulse signal and outputs the first standby drive signal. At the same time, the first optical coupler J1 amplifies the signal interface. The first pulse signal received by the port is detected, and the first drive signal is detected by the second optical coupler J2. When the first pulse signal is received but the first drive signal is not received, the first optical coupler J1 is turned on, and the second optical coupler J2 is turned off. The F terminal of the first logic chip IC2 will output a high level to control the first switch tube V1 to be turned on, and the sixth terminal of the first analog switch IC1 becomes a high level. At this time, the eighth terminal and the ninth terminal of the first analog switch IC1 are turned on, and the first standby drive signal is transmitted to the first power tube Q1 through the first analog switch IC1 to ensure the normal operation of the first power tube Q1. Similarly, since the control principles of the first drive control device, the second drive control device and the third drive control device are the same as the control principles of the standby drive module 4, the drive control module 2 and the drive detection module 3, and the conduction states of the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 are respectively ensured, and then the frequency conversion work is completed. The electric energy output after the frequency conversion is output by the output port interface.

[0054] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0055] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A frequency converter intelligent drive control circuit, characterized in that: The inverter intelligent drive control circuit includes: a power supply module, a drive control module, a drive detection module, a standby drive module, a drive control protection module, a frequency conversion module and an output module; The power supply module is used to receive working power and perform rectification and filtering on the working power; The drive control module is used to receive the first pulse signal, amplify the first drive signal and output the first drive signal; The drive detection module is connected to the drive control module, and is used to isolate and detect the first pulse signal and the first drive signal, and output a first control signal when the first pulse signal is received but the first drive signal is not received; The standby driving module is connected to the driving control module, the driving detection module and the frequency conversion module, and is used to transmit the first driving signal to the frequency conversion module, amplify the first pulse signal and output the first standby driving signal, and when receiving the first control signal, transmit the first standby driving signal to the frequency conversion module and stop transmitting the first driving signal; The drive control protection module is used to amplify the second pulse signal received and output the second drive signal and the second standby drive signal, amplify the third pulse signal received and output the third drive signal and the third standby drive signal, amplify the fourth pulse signal received and output the fourth drive signal and the fourth standby drive signal, transmit the second drive signal, the third drive signal and the fourth drive signal to the frequency conversion module, and transmit the second standby drive signal to the frequency conversion module when the second pulse signal is received but the second drive signal is not received, and transmit the third standby drive signal to the frequency conversion module when the third pulse signal is received but the third drive signal is not received, and transmit the fourth standby drive signal to the frequency conversion module when the fourth pulse signal is received but the fourth drive signal is not received; The frequency conversion module is connected to the power supply module and the drive control protection module, and is used to receive the first drive signal or the first standby drive signal, receive the second drive signal or the second standby drive signal, receive the third drive signal or the third standby drive signal, receive the fourth drive signal or the fourth standby drive signal, and perform frequency conversion; The output module is connected to the frequency conversion module and is used to receive the electric energy output by the frequency conversion module after frequency conversion.

2. The inverter intelligent drive control circuit according to claim 1, characterized in that: The power module includes a power input port, a first rectifier and a first capacitor; the frequency conversion module includes a first power tube, a second power tube, a third power tube and a fourth power tube; the output module includes an output port; The first end and the second end of the power input port are respectively connected to the first end and the second end of the first rectifier, the third end of the first rectifier is connected to one end of the first capacitor, the collector of the first power tube and the collector of the third power tube, the emitter of the first power tube is connected to the collector of the second power tube and one end of the output port, the emitter of the third power tube is connected to the collector of the fourth power tube and the other end of the output port, the fourth end of the first rectifier is connected to the other end of the first capacitor, the emitter of the second power tube and the emitter of the fourth power tube, the gate of the first power tube is connected to the standby drive module, and the second power tube, the third power tube and the fourth power tube are connected to the drive control protection module.

3. The inverter intelligent drive control circuit according to claim 2, characterized in that: The standby driving module includes a first analog switch; the driving control module includes a signal interface, a sixth resistor, a seventh resistor, a third power supply, a second switch tube, a third switch tube, a second capacitor, an eighth resistor and a first diode; The output end of the signal interface is connected to one end of the seventh resistor, the collector of the second switch tube, the base of the third switch tube and one end of the second capacitor through the sixth resistor, the other end of the seventh resistor, the other end of the second capacitor and the emitter of the third switch tube are all grounded, the emitter of the second switch tube is connected to the third power supply, the base of the second switch tube is connected to the collector of the third switch tube and the cathode of the first diode and is connected to the anode of the first diode and the third end of the first analog switch through the eighth resistor, and the fourth end and the ninth end of the first analog switch are both connected to the gate of the first power tube.

4. The inverter intelligent drive control circuit according to claim 3, characterized in that: The backup driving module also includes a first backup device, a fifth resistor, a second power supply and a first switch tube; The input end of the first backup device is connected to the output end of the signal interface, the output end of the first backup device is connected to the fifth end of the first analog switch, the second power supply is connected to the fifth end of the first analog switch and the collector of the first switch tube through the fifth resistor, the emitter of the first switch tube is grounded, and the base of the first switch tube is connected to the sixth end of the first analog switch and the drive detection module.

5. The intelligent drive control circuit of a frequency converter according to claim 4, characterized in that: The driving detection module includes a first resistor, a first logic chip, a first optical coupler, a first power supply, a second resistor, a third resistor, a fourth resistor and a second optical coupler; The first end of the first optocoupler is connected to the output end of the signal interface through the first resistor, the second end of the first optocoupler and the second end of the second optocoupler are both grounded, the third end of the first optocoupler is connected to the first power supply and connected to the second end of the second optocoupler and the B end of the first logic chip through the fourth resistor, the fourth end of the first optocoupler is connected to the A end of the first logic chip and grounded through the second resistor, the fourth end of the second optocoupler is grounded, and the F end of the first logic chip is connected to the base of the first switch tube.

6. The intelligent drive control circuit of a frequency converter according to claim 2, characterized in that: The drive control protection module includes a first drive device, a second drive device and a third drive device; The output end of the first driving device is connected to the gate of the second power tube, the output end of the second driving device is connected to the gate of the third power tube, and the output end of the third driving device is connected to the gate of the fourth power tube.

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