Switching power supply circuit

Abstract

The utility model discloses a switching power supply circuit, which relates to the technical field of switching power supply protection and comprises a power supply module used for supplying power; the switching power supply module is used for isolation voltage transformation regulation, multi-path rectification filtering, voltage stabilization regulation and current detection; the over-temperature detection module is used for over-temperature detection; the output module is used for receiving electric energy and detecting voltage; the driving control module is used for outputting a first pulse signal; the level detection module is used for detecting the level state of the first pulse signal; the switching control module is used for controlling the switch switching module to perform path switching when the temperature is over-high and the first pulse signal is in a low-level state; the switch switching module is used for transmitting the first pulse signal to the standby switch module and the switch power supply module; and the standby switch module is used for controlling the work of the switch power supply module. The switching power supply circuit can reduce the temperature of a power device in the switching power supply module, avoids a voltage reduction phenomenon caused by switching, and ensures power supply safety and power supply efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of switch power supply protection, in particular to a switch power supply circuit. Background Art

[0002] In the design of switching power supplies, the over-temperature protection circuit mainly determines whether the temperature of the switching power supply is too high by detecting the temperature of the power device. When the switching power supply works normally, the temperature of its power device will not exceed the critical temperature. When the switching power supply is over-temperature, the power device will be disconnected and the voltage regulation will be stopped. In some places where power supply needs to be maintained, when the temperature is over-temperature, the operating temperature of the power device is reduced by reducing the driving power of the power device. However, reducing the driving power will lead to a decrease in power supply efficiency when the switching power supply is over-temperature, and the power supply cannot be reasonably and effectively supplied, and there are hidden dangers in power supply safety. Therefore, it needs to be improved. Utility Model Content

[0003] The embodiment of the utility model provides a switching power supply 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] A switching power supply circuit, comprising: a power supply module, a switching power supply module, an over-temperature detection module, an output module, a drive control module, a level detection module, a switching control module, a switch switching module and a standby switch module;

[0006] A power module, used for providing direct current power;

[0007] A switch power supply module, connected to the power supply module and the switch switching module, for receiving the first pulse signal transmitted by the switch switching module and performing isolation, voltage transformation, multi-channel rectification, filtering and voltage stabilization on the input electric energy, and for detecting the regulated electric energy current and outputting a current feedback signal;

[0008] an over-temperature detection module, connected to the switching power supply module, for receiving the electric energy output by the switching power supply module and setting an over-temperature threshold, for detecting the temperature of the switching power supply module and outputting a temperature signal, and for outputting a first control signal when the temperature signal is greater than the over-temperature threshold;

[0009] An output module, connected to the switching power supply module, for receiving the electric energy output by the switching power supply module, for performing voltage sampling on the received electric energy and outputting a voltage feedback signal;

[0010] A drive control module, connected to the output module and the switch power module, configured to output a first pulse signal, receive a voltage feedback signal and a current feedback signal, and adjust a duty cycle of the first pulse signal;

[0011] A level detection module, connected to the drive control module, for detecting the level state of the first pulse signal output by the drive control module and outputting a second control signal when the first pulse signal is a low level device;

[0012] A switching control module, connected to the level detection module and the over-temperature detection module, used to perform logic calculation on the first control signal and the second control signal and output a third control signal of a high level, and used to self-lock and output the third control signal;

[0013] A switch switching module, connected to the switching control module, the drive control module and the standby switch module, for receiving the first pulse signal and transmitting the first pulse signal to the switch power module, for receiving the third control signal outputted by the switching control module by self-locking, for changing the transmission path of the received first pulse signal and transmitting the first pulse signal to the standby switch module;

[0014] The standby switch module is connected to the switch power module and is used to receive the first pulse signal transmitted by the switch switching module and control the isolation, transformation and regulation work of the switch power module.

[0015] As a further solution of the utility model: the power supply module includes a power supply and a first capacitor; the switching power supply module includes a first transformer, a first diode, a third capacitor, a first power tube, a first resistor, a second diode, a second capacitor and a first voltage stabilizer;

[0016] Preferably, the first end of the power supply is connected to the first end of the primary side of the first transformer and is connected to the second end of the power supply, the first end of the first resistor and the ground through the first capacitor, the second end of the first resistor is connected to the source of the first power tube, the drain of the first power tube is connected to the second end of the primary side of the first transformer, the gate of the first power tube is connected to the switch switching module, the first end of the first secondary side of the first transformer and the first end of the second secondary side are respectively connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the second end of the first secondary side of the first transformer and the ground through the third capacitor, the cathode of the second diode is connected to the first end of the first regulator and is connected to the second end of the second secondary side of the first transformer, the third end of the first regulator and the ground through the second capacitor.

[0017] As a further solution of the utility model: the drive control module includes a drive control device; the output module includes an output port and a voltage feedback device;

[0018] Preferably, one end of the output port and one end of the voltage feedback device are both connected to the cathode of the first diode, the other end of the output port is grounded, the other end of the voltage feedback device is connected to the voltage feedback end of the drive control device, the current feedback end of the drive control device is connected to the second end of the first resistor, and the output end of the drive control device is connected to the switch switching module.

[0019] As a further solution of the utility model: the switch switching module includes a first analog switch, a second resistor, a first power supply and a first switch tube; the standby switch module includes a second power tube;

[0020] Preferably, the third end and the eighth end of the first analog switch are both connected to the output end of the drive control device, the sixth end of the first analog switch is connected to the switching control module and the base of the first switch tube, the base of the first switch tube is grounded, the collector of the first switch tube is connected to the fifth end of the first analog switch and is connected to the first power supply through the second resistor, the fourth end and the ninth end of the first analog switch are respectively connected to the gate of the first power tube and the gate of the second power tube, and the drain and source of the second power tube are respectively connected to the second end of the primary side of the first transformer and the second end of the first resistor.

[0021] As a further solution of the utility model: the level detection module includes a third diode, a second switch tube, a third resistor and a second power supply;

[0022] Preferably, the anode of the third diode is connected to the output end of the drive control device, the cathode of the third diode is connected to the base of the second switch tube, the emitter of the second switch tube is grounded, and the collector of the second switch tube is connected to the switching control module and connected to the second power supply through the third resistor.

[0023] As a further solution of the utility model: the over-temperature detection module includes a sixth resistor, a first thermistor, a fourth resistor, a fifth resistor and a first comparator;

[0024] Preferably, the in-phase end of the first comparator is connected to one end of the sixth resistor and grounded through the first thermistor, the inverting end of the first comparator is connected to one end of the fourth resistor and grounded through the fifth resistor, the other end of the sixth resistor and the other end of the fourth resistor are both connected to the second end of the first regulator, and the output end of the first comparator is connected to the switching control module.

[0025] As a further solution of the utility model: the switching control module includes a first logic chip and a signal self-locking device;

[0026] Preferably, the first end and the second end of the first logic chip are respectively connected to the output end of the first comparator and the collector of the second switch tube, the third end of the first logic chip is connected to the input end of the signal self-locking device, and the output end of the signal self-locking device is connected to the base of the first switch tube.

[0027] Compared with the prior art, the beneficial effects of the utility model are as follows: the switching power supply circuit of the utility model controls the switching power supply module to perform voltage stabilization and regulation processing by the driving control module in cooperation with the voltage feedback signal output by the output module and the current feedback signal output by the switching power supply module, the over-temperature detection module performs temperature detection on the power device of the switching power supply module, the level detection module detects the level state of the signal output by the driving control module, and when the temperature is over and the level detection module detects that the signal output by the driving control module is at a low level, the switching control module triggers the switch switching module to control the standby switch module to enter the power regulation operation, thereby reducing the temperature of the power device in the switching power supply module and avoiding the temporary voltage drop phenomenon caused by switch switching, thereby ensuring power supply safety and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 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.

[0029] Figure 1 The present invention provides a schematic block diagram of a switching power supply circuit.

[0030] Figure 2 A circuit diagram of a switching power supply circuit provided in an example of the utility model.

[0031] Figure 3 This is a connection circuit diagram of a switching control module provided by an example of the utility model. DETAILED DESCRIPTION

[0032] 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.

[0033] In one embodiment, see Figure 1 , a switching power supply circuit, comprising: a power supply module 1, a switching power supply module 2, an over-temperature detection module 3, an output module 4, a drive control module 5, a level detection module 6, a switching control module 7, a switch switching module 8 and a standby switch module 9;

[0034] Specifically, the power module 1 is used to provide DC power;

[0035] The switch power supply module 2 is connected to the power supply module 1 and the switch switching module 8, and is used to receive the first pulse signal transmitted by the switch switching module 8 and perform isolation, voltage transformation, multi-channel rectification, filtering and voltage stabilization on the input electric energy, and is used to detect the regulated electric energy current and output a current feedback signal;

[0036] an over-temperature detection module 3, connected to the switching power supply module 2, for receiving the electric energy output by the switching power supply module 2 and setting an over-temperature threshold, for detecting the temperature of the switching power supply module 2 and outputting a temperature signal, and for outputting a first control signal when the temperature signal is greater than the over-temperature threshold;

[0037] An output module 4, connected to the switching power supply module 2, for receiving the electric energy output by the switching power supply module 2, for performing voltage sampling on the received electric energy and outputting a voltage feedback signal;

[0038] A drive control module 5, connected to the output module 4 and the switch power module 2, for outputting a first pulse signal, for receiving a voltage feedback signal and a current feedback signal and adjusting a duty cycle of the first pulse signal;

[0039] A level detection module 6, connected to the drive control module 5, for detecting the level state of the first pulse signal output by the drive control module 5 and outputting a second control signal when the first pulse signal is a low level device;

[0040] A switching control module 7, connected to the level detection module 6 and the over-temperature detection module 3, for performing logic calculation on the first control signal and the second control signal and outputting a third control signal of a high level, for self-locking and outputting the third control signal;

[0041] The switch switching module 8 is connected to the switch control module 7, the drive control module 5 and the standby switch module 9, and is used to receive the first pulse signal and transmit the first pulse signal to the switch power supply module 2, and is used to receive the third control signal output by the self-locking switch control module 7, and is used to change the transmission path of the received first pulse signal and transmit the first pulse signal to the standby switch module 9;

[0042] The standby switch module 9 is connected to the switch power module 2 and is used to receive the first pulse signal transmitted by the switch switching module 8 and control the isolation, transformation and regulation work of the switch power module 2 .

[0043] In a specific embodiment, the power supply module 1 can adopt a power supply circuit composed of a power supply and a capacitor to provide DC power; the switching power supply module 2 can adopt a switching power supply circuit composed of a transformer, a diode, a capacitor, a power tube, a voltage stabilizer, etc. to realize isolation transformer regulation, multi-channel rectification filtering and voltage regulation; the over-temperature detection module 3 can adopt an over-temperature detection circuit composed of a transformer, a thermistor, etc., which can set the over-temperature threshold and compare the magnitude relationship between the detected temperature signal and the over-temperature threshold; the output module 4 can adopt an output circuit composed of a voltage feedback device and an output port, which is connected to the power load, and samples and processes the input power voltage; the drive control module 5 can adopt a drive control circuit composed of a pulse width modulation chip, which can output a first pulse signal, that is, a drive signal, and feedback the feedback voltage according to the feedback voltage. The signal and the current feedback signal adjust the duty cycle of the first pulse signal; the level detection module 6 can adopt a level detection circuit composed of a diode, a triode, etc., and when the input signal is in a low level state, it outputs a high level second control signal; the switching control module 7 can adopt a switching control circuit composed of a logic chip and a signal self-locking device, and when the temperature is over and the first pulse signal is in a low level state, the switch switching module 8 is triggered to switch the path; the switch switching module 8 can adopt a switch switching circuit composed of an analog switch, a triode, etc., which can transmit the input signal to the switching power supply module 2, and after receiving the signal output by the switching control module 7, switch the signal transmission path, and transmit the signal to the standby switch module 9; the standby switch module 9 can adopt a standby power supply circuit composed of a power tube to control the operation of the switching power supply module 2.

[0044] In another embodiment, see Figure 1 , Figure 2 and Figure 3 The power supply module 1 includes a power supply and a first capacitor C1; the switching power supply module 2 includes a first transformer B1, a first diode D1, a third capacitor C3, a first power tube Q1, a first resistor R1, a second diode D2, a second capacitor C2 and a first voltage stabilizer U2;

[0045] Specifically, the first end of the power supply is connected to the first end of the primary side of the first transformer B1 and is connected to the second end of the power supply, the first end of the first resistor R1 and the ground through the first capacitor C1, the second end of the first resistor R1 is connected to the source of the first power tube Q1, the drain of the first power tube Q1 is connected to the second end of the primary side of the first transformer B1, the gate of the first power tube Q1 is connected to the switch switching module 8, the first end of the first secondary side of the first transformer B1 and the first end of the second secondary side are respectively connected to the anode of the first diode D1 and the anode of the second diode D2, the cathode of the first diode D1 is connected to the second end of the first secondary side of the first transformer B1 and the ground through the third capacitor C3, and the cathode of the second diode D2 is connected to the first end of the first voltage regulator U2 and is connected to the second end of the second secondary side of the first transformer B1, the third end of the first voltage regulator U2 and the ground through the second capacitor C2.

[0046] In a specific embodiment, the power supply can be a DC power supply device such as a battery; the first transformer B1 can be a high-frequency transformer; the first power tube Q1 can be an N-channel field effect tube to control the isolation and transformation work of the first comparator A1; the first voltage stabilizer U2 can be an LM317 voltage stabilizer.

[0047] Further, the drive control module 5 includes a drive control device; the output module 4 includes an output port and a voltage feedback device;

[0048] Specifically, one end of the output port and one end of the voltage feedback device are both connected to the cathode of the first diode D1, the other end of the output port is grounded, the other end of the voltage feedback device is connected to the voltage feedback end of the drive control device, the current feedback end of the drive control device is connected to the second end of the first resistor R1, and the output end of the drive control device is connected to the switch switching module 8.

[0049] In a specific embodiment, the voltage feedback device may be composed of a resistor voltage divider circuit, a PC817 photocoupler, a TL431 voltage regulator and a capacitor to provide a voltage feedback signal for the drive control device; the drive control device may use a UC3824 pulse width modulation chip.

[0050] Furthermore, the switch switching module 8 includes a first analog switch U1, a second resistor R2, a first power supply VCC1 and a first switch tube VT1; the standby switch module 9 includes a second power tube Q2;

[0051] Specifically, the third end and the eighth end of the first analog switch U1 are both connected to the output end of the drive control device, the sixth end of the first analog switch U1 is connected to the switching control module 7 and the base of the first switch tube VT1, the base of the first switch tube VT1 is grounded, the collector of the first switch tube VT1 is connected to the fifth end of the first analog switch U1 and is connected to the first power supply VCC1 through the second resistor R2, the fourth end and the ninth end of the first analog switch U1 are respectively connected to the gate of the first power tube Q1 and the gate of the second power tube Q2, and the drain and source of the second power tube Q2 are respectively connected to the second end of the primary side of the first transformer B1 and the second end of the first resistor R1.

[0052] In a specific embodiment, the first analog switch U1 can use a CD4066 chip, wherein when the sixth terminal of the first analog switch U1 is in a high level state, the eighth terminal and the ninth terminal of the first analog switch U1 are controlled to be turned on, and when the fifth terminal is in a high level state, the third terminal and the fourth terminal are controlled to be turned on; the first switch tube VT1 can use an NPN transistor; the second power tube Q2 can use an N-channel field effect tube.

[0053] Furthermore, the level detection module 6 includes a third diode D3, a second switch tube VT2, a third resistor R3 and a second power supply VCC2;

[0054] Specifically, the anode of the third diode D3 is connected to the output end of the drive control device, the cathode of the third diode D3 is connected to the base of the second switch tube VT2, the emitter of the second switch tube VT2 is grounded, and the collector of the second switch tube VT2 is connected to the switching control module 7 and connected to the second power supply VCC2 through the third resistor R3.

[0055] In a specific embodiment, the second switch tube VT2 can be a NPN transistor. When the first pulse signal output by the driving control device is at a low level, the second switch tube VT2 is turned off.

[0056] Further, the over-temperature detection module 3 includes a sixth resistor R6, a first thermistor NTC, a fourth resistor R4, a fifth resistor R5 and a first comparator A1;

[0057] Specifically, the in-phase end of the first comparator A1 is connected to one end of the sixth resistor R6 and is grounded through the first thermistor NTC, the inverting end of the first comparator A1 is connected to one end of the fourth resistor R4 and is grounded through the fifth resistor R5, the other end of the sixth resistor R6 and the other end of the fourth resistor R4 are both connected to the second end of the first regulator U2, and the output end of the first comparator A1 is connected to the switching control module 7.

[0058] In a specific embodiment, the first comparator A1 may be a LM397 comparator, the fourth resistor R4 and the fifth resistor R5 provide an over-temperature threshold; the first thermistor NTC may be a thermistor with a positive temperature coefficient.

[0059] Furthermore, the switching control module 7 includes a first logic chip U3 and a signal self-locking device;

[0060] Specifically, the first and second ends of the first logic chip U3 are respectively connected to the output end of the first comparator A1 and the collector of the second switch tube VT2, the third end of the first logic chip U3 is connected to the input end of the signal self-locking device, and the output end of the signal self-locking device is connected to the base of the first switch tube VT1.

[0061] In a specific embodiment, the first logic chip U3 can be selected as a logic chip; the signal self-locking device can adopt a signal self-locking circuit composed of a transistor and a resistor, which can self-lock the input high-level signal and output a high-level signal, which will not be elaborated here.

[0062] In a switching power supply circuit of the present embodiment, a power supply provides direct current power, a first capacitor C1 performs filtering, a first transformer B1 cooperates with a first power tube Q1 to perform isolation transformation and regulation, a first resistor R1 performs current detection, a first diode D1 and a third capacitor C3 and a second diode D2 and a second capacitor C2 all perform rectification and filtering processing, and transmit the current to an output port, a voltage feedback device detects the output power voltage and feeds back the detection signal to a drive control device, the drive control device controls the conduction degree of the first power tube Q1 according to the feedback signal, and then controls the power transmitted by the first transformer B1, a first voltage stabilizer U2 performs voltage stabilization processing, a sixth resistor R6 and a first thermistor NTC perform temperature detection on the first power tube Q1, and when the detected temperature exceeds the fourth When the resistor R4 and the fifth resistor R5 set the over-temperature threshold, the first comparator A1 outputs a high level, and when the first pulse signal output by the drive control device is in a low level state, the first power tube Q1 is in a cut-off state, and the primary side of the first transformer B1 stores energy. At this time, the second switch tube VT2 is cut off, and the second power supply VCC2 and the third resistor R3 pull up the potential of the second end of the first logic chip U3, so that the first logic chip U3 outputs a high level, and the signal self-locking device performs high-level self-locking, and triggers the first switch tube VT1 to turn on, the sixth end of the first analog switch U1 becomes a high level, the eighth end and the ninth end of the first logic chip U3 are turned on, the first power tube Q1 is cut off, and the drive control device drives the second power tube Q2 to work normally through the first analog switch U1.

Claims

1. A switching power supply circuit, It is characterized in that The switch power supply circuit includes: a power supply module, a switch power supply module, an over-temperature detection module, an output module, a drive control module, a level detection module, a switch control module, a switch switching module and a standby switch module; The power module is used to provide direct current power; The switch power supply module is connected to the power supply module and the switch switching module, and is used to receive the first pulse signal transmitted by the switch switching module and perform isolation, voltage transformation, multi-channel rectification, filtering and voltage stabilization on the input electric energy, and is used to detect the regulated electric energy current and output a current feedback signal; The over-temperature detection module is connected to the switching power supply module, and is used to receive the electric energy output by the switching power supply module and set the over-temperature threshold, and is used to detect the temperature of the switching power supply module and output a temperature signal, and is used to output a first control signal when the temperature signal is greater than the over-temperature threshold; The output module is connected to the switching power supply module, and is used to receive the electric energy output by the switching power supply module, and is used to perform voltage sampling on the received electric energy and output a voltage feedback signal; The drive control module is connected to the output module and the switch power supply module, and is used to output a first pulse signal, receive a voltage feedback signal and a current feedback signal, and adjust a duty cycle of the first pulse signal; The level detection module is connected to the drive control module and is used to detect the level state of the first pulse signal output by the drive control module and output a second control signal when the first pulse signal is a low level device; The switching control module is connected to the level detection module and the over-temperature detection module, and is used to perform logic calculation on the first control signal and the second control signal and output a third control signal of a high level, and is used to self-lock and output the third control signal; The switch switching module is connected to the switch control module, the drive control module and the standby switch module, and is used to receive the first pulse signal and transmit the first pulse signal to the switch power supply module, and is used to receive the third control signal output by the switch control module, and is used to change the transmission path of the received first pulse signal and transmit the first pulse signal to the standby switch module; The standby switch module is connected to the switch power module and is used to receive the first pulse signal transmitted by the switch switching module and control the isolation, transformation and regulation work of the switch power module; The power supply module includes a power supply and a first capacitor; the switching power supply module includes a first transformer, a first diode, a third capacitor, a first power tube, a first resistor, a second diode, a second capacitor and a first voltage stabilizer; The drive control module includes a drive control device; the output module includes an output port and a voltage feedback device; The switch switching module includes a first analog switch, a second resistor, a first power supply and a first switch tube; the standby switch module includes a second power tube; The third end and the eighth end of the first analog switch are both connected to the output end of the drive control device, the sixth end of the first analog switch is connected to the switching control module and the base of the first switch tube, the base of the first switch tube is grounded, the collector of the first switch tube is connected to the fifth end of the first analog switch and is connected to the first power supply through the second resistor, the fourth end and the ninth end of the first analog switch are respectively connected to the gate of the first power tube and the gate of the second power tube, and the drain and source of the second power tube are respectively connected to the second end of the primary side of the first transformer and the second end of the first resistor; The level detection module includes a third diode, a second switch tube, a third resistor and a second power supply; The anode of the third diode is connected to the output end of the driving control device, the cathode of the third diode is connected to the base of the second switch tube, the emitter of the second switch tube is grounded, and the collector of the second switch tube is connected to the switching control module and connected to the second power supply through the third resistor; The over-temperature detection module includes a sixth resistor, a first thermistor, a fourth resistor, a fifth resistor and a first comparator; The non-inverting end of the first comparator is connected to one end of the sixth resistor and grounded through the first thermistor, the inverting end of the first comparator is connected to one end of the fourth resistor and grounded through the fifth resistor, the other end of the sixth resistor and the other end of the fourth resistor are both connected to the second end of the first regulator, and the output end of the first comparator is connected to the switching control module; The switching control module includes a first logic chip and a signal self-locking device; The first end and the second end of the first logic chip are respectively connected to the output end of the first comparator and the collector of the second switch tube, the third end of the first logic chip is connected to the input end of the signal self-locking device, and the output end of the signal self-locking device is connected to the base of the first switch tube.

2. A switching power supply circuit according to claim 1, It is characterized in that The first end of the power supply is connected to the first end of the primary side of the first transformer and is connected to the second end of the power supply, the first end of the first resistor and the ground through the first capacitor; the second end of the first resistor is connected to the source of the first power tube, the drain of the first power tube is connected to the second end of the primary side of the first transformer, the gate of the first power tube is connected to the switch switching module, the first end of the first secondary side of the first transformer and the first end of the second secondary side are respectively connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the second end of the first secondary side of the first transformer and the ground through the third capacitor, the cathode of the second diode is connected to the first end of the first regulator and is connected to the second end of the second secondary side of the first transformer, the third end of the first regulator and the ground through the second capacitor.

3. A switching power supply circuit according to claim 2, It is characterized in that One end of the output port and one end of the voltage feedback device are both connected to the cathode of the first diode, the other end of the output port is grounded, the other end of the voltage feedback device is connected to the voltage feedback end of the drive control device, the current feedback end of the drive control device is connected to the second end of the first resistor, and the output end of the drive control device is connected to the switch switching module.

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