An ACDC switching power supply safety protection circuit

Abstract

The present invention discloses an ACDC switching power supply safety protection circuit, which relates to the technical field of power supply protection. The circuit includes a switching power supply module that cooperates with an output detection module and a multi-output module to perform power rectification and DC high-frequency regulation work; a primary detection module for performing overvoltage judgment on the voltage output by the multi-output module; an output detection module for performing voltage detection, overvoltage judgment and signal processing on the first output module; a first protection module for controlling the transmission of electric energy and stopping the transmission of electric energy when overvoltage first occurs in the first output module; a second protection module for controlling the transmission of electric energy and stopping the transmission of electric energy when overvoltage first occurs in the second output module; a first output module and a second output module, both of which are used for output rectification. The ACDC switching power supply safety protection circuit of the present invention realizes voltage stabilization processing and multi-channel equal-voltage output, and judges whether the output is overvoltage, so as to control the power supply states of the first output module and the second output module.

Description

Technical Field

[0001] The present invention relates to the technical field of power protection, and specifically to an ACDC switching power supply safety protection circuit. Background Art

[0002] With the continuous improvement of the social development speed, people's demand for electric power resources is also gradually increasing. As an indispensable electric energy conversion device in modern electronic systems, a switching power supply can convert voltage into a specific voltage suitable for the needs of electrical equipment. In existing switching power supplies, multiple outputs can be achieved, and mostly the secondary side feedback control method is used to sample the output electric energy of one of the multiple output terminals, and then perform multi-channel equal-voltage regulation output on the multiple output terminals. However, when a fault occurs in the load connected to one of the output terminals, resulting in voltage boost, the switching power supply can only protect the circuit by cutting off the power supply, with low intelligence, and the switching power supply maintains the power supply state, resulting in a reduction in the working efficiency of the switching power supply. Therefore, it needs to be improved. Summary of the Invention

[0003] An embodiment of the present invention provides an ACDC switching power supply safety protection circuit to solve the problems raised in the above background art.

[0004] According to the embodiment of the present invention, an ACDC switching power supply safety protection circuit is provided. The ACDC switching power supply safety protection circuit includes: a switching power supply module, a multiple output module, a primary side detection module, a first protection module, a second protection module, a first output module, a second output module, and an output detection module;

[0005] The switching power supply module is connected to the output detection module and the multiple output module, and is used to provide AC electric energy and perform rectification and filtering processing on the AC electric energy, and is used to receive the signal output by the output detection module and perform high-frequency regulation on the electric energy input to the multiple output module;

[0006] The multiple output module is used to cooperate with the switching power supply module and perform high-frequency DC-DC regulation control on the input electric energy, and is used to isolate and output the regulated electric energy in multiple equal-voltage channels,

[0007] The primary side detection module is connected to the multiple output module, and is used to detect the voltage output by the multiple output module and output a first detection signal, and is used to set a first overvoltage threshold and determine whether the first detection signal is greater than the set first overvoltage threshold, and is used to output a first control signal when the first detection signal is greater than the set first overvoltage threshold;

[0008] The output detection module, connected to the first output module, is used to detect the voltage of the electric energy output by the first output module, determine overvoltage, and output a second control signal in case of overvoltage, invert the second control signal and output a third control signal, and transmit the signal obtained from voltage detection to the switching power supply module;

[0009] The first protection module, connected to the primary side detection module, output detection module, multi-output module, and first output module, is used to transmit the electric energy output by the multi-output module to the first output module through the first relay circuit, invert the first control signal through the first logic circuit, perform an AND logic operation on the inverted signal and the third control signal, and perform signal self-locking, and control the first relay circuit to stop the power transmission work when overvoltage occurs in the first output module first;

[0010] The second protection module, connected to the primary side detection module, output detection module, multi-output module, and second output module, is used to transmit the electric energy output by the multi-output module to the second output module through the second relay circuit, perform an AND logic operation on the first control signal and the second control signal through the second logic circuit, and perform signal self-locking, and control the second relay circuit to stop the power transmission work when overvoltage occurs in the second output module first;

[0011] The first output module is used to rectify and filter the electric energy transmitted by the first protection module and output it;

[0012] The second output module is used to rectify and filter the electric energy transmitted by the second protection module and output it.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The ACDC switching power supply safety protection circuit of the present invention performs voltage stabilization adjustment and multi-path equal-voltage output control by cooperating the switching power supply module with the multi-output module. The primary side detection module and the output detection module respectively judge whether overvoltage occurs in the voltage output by the multi-output module and the voltage input to the first output module. The first protection module disconnects the operation of the first output module when the first output module is overvoltage and the primary side detection module is not overvoltage. The second protection circuit disconnects the operation of the second output module when the primary side detection module is overvoltage but the first output module is not overvoltage, realizing the normal power supply work of the normal circuit, and improving the power supply efficiency and power supply safety of the switching power supply. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic block diagram of the principle of an ACDC switching power supply safety protection circuit provided by an example of the present invention.

[0016] Figure 2 It is a circuit diagram of an ACDC switching power supply safety protection circuit provided by an example of the present invention.

[0017] Figure 3 It is a connection circuit diagram of the first protection module provided by an example of the present invention.

[0018] Figure 4 It is a connection circuit diagram of the second protection module provided by an example of the present invention Specific implementation mode

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] In one embodiment, please refer to Figure 1 , an ACDC switching power supply safety protection circuit includes: a switching power supply module 1, a multi-output module 2, a primary detection module 3, a first protection module 4, a second protection module 5, a first output module 6, a second output module 7, and an output detection module 8;

[0021] Specifically, the switching power supply module 1 is connected to the output detection module 8 and the multi-output module 2, and is used to provide AC power and perform rectification and filtering processing on the AC power, and is used to receive the signal output by the output detection module 8 and perform high-frequency regulation on the power input to the multi-output module 2;

[0022] The multi-output module 2 is used to cooperate with the switching power supply module 1 and perform high-frequency DC-DC regulation control on the input power, and is used to isolate and output the regulated power in multiple equal-voltage ways,

[0023] The primary detection module 3 is connected to the multi-output module 2, and is used to detect the voltage output by the multi-output module 2 and output a first detection signal, and is used to set a first overvoltage threshold and determine whether the first detection signal is greater than the set first overvoltage threshold, and is used to output a first control signal when the first detection signal is greater than the set first overvoltage threshold;

[0024] The output detection module 8, connected to the first output module 6, is configured to perform voltage detection and overvoltage judgment on the electric energy output by the first output module 6 and output a second control signal when overvoltage occurs, to perform an inversion process on the second control signal and output a third control signal, and to transmit the signal obtained from voltage detection to the switching power supply module 1;

[0025] The first protection module 4, connected to the primary side detection module 3, the output detection module 8, the multi-output module 2, and the first output module 6, is configured to transmit the electric energy output by the multi-output module 2 to the first output module 6 through a first relay circuit, to perform an inversion process on the first control signal through a first logic circuit and perform an AND logic operation and signal self-locking on the inverted signal and the third control signal, and to control the first relay circuit to stop the power transmission work when overvoltage occurs first in the first output module 6;

[0026] The second protection module 5, connected to the primary side detection module 3, the output detection module 8, the multi-output module 2, and the second output module 7, is configured to transmit the electric energy output by the multi-output module 2 to the second output module 7 through a second relay circuit, to perform an AND logic operation and signal self-locking on the first control signal and the second control signal through a second logic circuit, and to control the second relay circuit to stop the power transmission work when overvoltage occurs first in the second output module 7;

[0027] The first output module 6 is configured to perform rectification and filtering processing on the electric energy transmitted by the first protection module 4 and output it;

[0028] The second output module 7 is configured to perform rectification and filtering processing on the electric energy transmitted by the second protection module 5 and output it.

[0029] In a specific embodiment, the above-mentioned switching power supply module 1 may adopt a rectifier filter circuit and a pulse width modulation circuit. The rectifier filter circuit provides AC electrical energy and performs rectification and filtering processing on the AC electrical energy. The pulse width modulation circuit performs high-frequency regulation on the electrical energy input to the multi-output module 2 according to the signal detected by the output detection module 8. The above-mentioned multi-output module 2 may adopt a high-frequency transformer circuit, which is controlled by the switching power supply module 1 to achieve multi-channel equal-voltage output control. The above-mentioned primary side detection module 3 may adopt a primary side detection circuit composed of an overvoltage detection circuit to detect and perform overvoltage judgment on the voltage output from the output side of the multi-output module 2. The above-mentioned first protection module 4 may adopt a first relay circuit and a first logic circuit. The first relay circuit controls the transmission of electrical energy, and the first logic circuit processes the input signal and performs AND logic self-locking processing and controls the first relay circuit to stop the transmission of electrical energy when overvoltage first appears in the first output module 6. The above-mentioned second protection module 5 may adopt a second relay circuit and a second logic circuit. The second relay circuit controls the transmission of electrical energy, and the second logic circuit processes the input signal and performs AND logic self-locking processing and controls the second relay circuit to stop the transmission of electrical energy when overvoltage first appears in the second output module 7. The above-mentioned first output module 6 and second output module 7 may both adopt a rectifier filter output circuit to perform rectification, filtering processing and electrical energy output on the input electrical energy. The above-mentioned output detection module 8 may adopt a voltage detection circuit and an overvoltage detection circuit. The voltage detection circuit detects the voltage of the first output module 6 and the overvoltage detection circuit performs overvoltage judgment.

[0030] In another embodiment, please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the switching power supply module 1 includes an AC power supply, a first rectifier T1, a first capacitor C1, a first resistor R1, a first power transistor Q1, a pulse regulating device U1 and an isolation feedback device; the output detection module 8 includes a third resistor R3 and a fourth resistor R4.

[0031] Specifically, the first end and the second end of the AC power supply are respectively connected to the first input end and the second input end of the first rectifier T1. The first output end of the first rectifier T1 is connected to the first end of the first capacitor C1. The second end of the first capacitor C1 is connected to the second output end of the first rectifier T1, one end of the first resistor R1 and the ground terminal. The second end of the first resistor R1 is connected to the current terminal of the pulse regulating device U1 and the drain of the first power transistor Q1. The source of the first power transistor Q1 is connected to the multi-output module 2. The gate of the first power transistor Q1 is connected to the output end of the pulse regulating device U1. The voltage terminal of the pulse regulating device U1 is connected to the output end of the isolation feedback device. The input end of the isolation feedback device is connected to the first end of the third resistor R3 and grounded through the fourth resistor R4. The second end of the third resistor R3 is connected to the first output module 6.

[0032] In a specific embodiment, the above-mentioned first power transistor Q1 can be a P-channel enhancement-mode MOS transistor; the above-mentioned pulse adjustment device U1 can be selected, but is not limited to, switching power supply control chips such as CR5069S, which is not limited here; the above-mentioned isolation feedback device can adopt a secondary-side feedback control method, which will not be elaborated here; the above-mentioned third resistor R3 and fourth resistor R4 form a voltage detection circuit.

[0033] Further, the multi-output module 2 includes a first transformer B1;

[0034] Specifically, the first end of the primary winding of the first transformer B1 is connected to the first end of the first capacitor C1, the second end of the primary winding of the first transformer B1 is connected to the source electrode of the first power transistor Q1, the first secondary winding and the second secondary winding of the first transformer B1 are respectively connected to the first protection module 4 and the second protection module 5, and the auxiliary winding of the first transformer B1 is connected to the primary-side detection module 3.

[0035] In a specific embodiment, the above-mentioned first transformer B1 can be a high-frequency transformer, and the auxiliary winding of the first transformer B1 can detect the voltages output by the first secondary winding and the second secondary winding of the first transformer B1, which will not be elaborated here.

[0036] Further, the primary-side detection module 3 includes a first diode D1, a first potentiometer RP1, and a second diode D2;

[0037] Specifically, the anode of the first diode D1 is connected to the first end of the auxiliary winding of the first transformer B1, the second end of the auxiliary winding of the first transformer B1 is grounded, the cathode of the first diode D1 is connected to the first end and the sliding contact end of the first potentiometer RP1, the second end of the first potentiometer RP1 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is connected to the first protection module 4 and the second protection module 5.

[0038] In a specific embodiment, the above-mentioned second potentiometer RP2 and second diode D2 are used to set the overvoltage threshold and form a primary-side detection circuit in cooperation with the first diode D1.

[0039] Further, the first protection module 4 includes a first relay switch K1-1; the first output module 6 includes a fifth diode D5, a sixth diode D6, a third capacitor C3, and a first output port;

[0040] Specifically, the first end of the first relay switch K1-1 is connected to the first end of the first secondary winding of the first transformer B1, the second end of the first relay switch K1-1 is connected to the anode of the fifth diode D5, the cathode of the fifth diode D5 is connected to the cathode of the sixth diode D6, one end of the third capacitor C3, the second end of the third resistor R3, and the first end of the first output port. The second end of the first output port, the other end of the third capacitor C3, the anode of the sixth diode D6, and the second end of the secondary winding of the first transformer B1 are all grounded.

[0041] In a specific embodiment, the above-mentioned first relay switch K1-1 can be selected as a normally closed switch; the above-mentioned fifth diode D5, sixth diode D6, and third capacitor C3 perform filtering and rectification work. It should be noted that the first output circuit composed of the fifth diode D5, sixth diode D6, third capacitor C3, and the first output port is the main output port.

[0042] Furthermore, the second protection module 5 includes a second relay switch K2-1; the second output module 7 includes a third diode D3, a fourth diode D4, a second capacitor C2, and a second output port;

[0043] Specifically, the first end of the second relay switch K2-1 is connected to the first end of the second secondary winding of the first transformer B1, the second end of the second relay switch K2-1 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to the cathode of the fourth diode D4, one end of the second capacitor C2, and the first end of the second output port. The anode of the fourth diode D4, the other end of the second capacitor C2, the second end of the second output port, and the second end of the second secondary winding of the first transformer B1 are all grounded.

[0044] In a specific embodiment, the above-mentioned second relay switch K2-1 can be selected as a normally closed switch; the above-mentioned third diode D3, fourth diode D4, and second capacitor C2 perform rectification and filtering work. It should be noted that the second output circuit composed of the third diode D3, fourth diode D4, second capacitor C2, and the second output port is the port for branch output, and the branch output port is not limited to the second output module 7. The third output module, fourth output module, etc. can be expanded according to requirements and will not be elaborated here.

[0045] Furthermore, the output detection module 8 further includes a second potentiometer RP2, a seventh diode D7, and a first inverter J1; the second protection module 5 further includes a second logic chip J4, a ninth diode D9, a second resistor R2, a second switching transistor VT2, a second relay K2, and a second power supply VCC2;

[0046] Specifically, one end of the second potentiometer RP2 is connected to the first end of the third resistor R3, the other end of the second potentiometer RP2 is connected to the cathode of the seventh diode D7, the anode of the seventh diode D7 is connected to the input end of the first inverter J1, the output end of the first inverter J1 is connected to the second input end of the second logic chip J4, the first input end of the second logic chip J4 is connected to the cathode of the ninth diode D9 and the anode of the second diode D2, the output end of the second logic chip J4 is connected to the anode of the ninth diode D9 and connected to the base of the second switching transistor VT2 through the second resistor R2, the emitter of the second switching transistor VT2 is grounded, and the collector of the second switching transistor VT2 is connected to the second power supply VCC2 through the second relay K2.

[0047] In a specific embodiment, the above-mentioned second potentiometer RP2 and seventh diode D7 provide an overvoltage threshold; the above-mentioned second logic chip J4 can be a NAND logic chip, and cooperate with the ninth diode D9 and the second resistor R2 to realize the self-locking control of the output signal of the primary side detection module 3; the above-mentioned second switching transistor VT2 can be an NPN type triode to control the operation of the second relay K2, where the second relay K2 controls the conduction and disconnection of the second relay switch K2-1.

[0048] Further, the first protection module 4 further includes a second inverter J2, a first logic chip J3, an eighth diode D8, a fifth resistor R5, a first switching transistor VT1, a first relay K1, and a first power supply VCC1;

[0049] Specifically, the input end of the second inverter J2 is connected to the anode of the second diode D2, the output end of the second inverter J2 is connected to the first input end of the first logic chip J3, the second input end of the first logic chip J3 is connected to the cathode of the eighth diode D8 and the anode of the seventh diode D7, the output end of the first logic chip J3 is connected to the anode of the eighth diode D8 and connected to the base of the first switching transistor VT1 through the fifth resistor R5, the emitter of the first switching transistor VT1 is grounded, and the collector of the first switching transistor VT1 is connected to the first power supply VCC1 through the first relay K1.

[0050] In a specific embodiment, the above-mentioned second logic chip J4 can be a NAND logic chip, and cooperate with the eighth diode D8 and the fifth resistor R5 to perform self-locking control on the signal output by the output detection module 8; the above-mentioned first switching transistor VT1 can be an NPN type triode to control the operation of the first relay K1, and the first relay K1 controls the conduction and disconnection of the first relay switch K1-1.

[0051] In a safety protection circuit of an AC-DC switching power supply according to the present invention, the AC power supplied by an AC power source is subjected to AC-DC processing through a first rectifier T1 and a first capacitor C1. A pulse regulating device U1 controls the conduction degree of a first power transistor Q1 according to signals fed back by a third resistor R3, a fourth resistor R4, and an isolation feedback device, and then adjusts the electric energy transmitted by a primary winding of a first transformer B1. The electric energy is output by a first secondary winding and a second secondary winding of the first transformer B1. The output electric energy is transmitted to a first output port and a second output port through a first relay switch K1-1 and a second relay switch K2-1 respectively. The auxiliary winding of the first transformer B1 can detect the output voltage conditions of the first secondary winding and the second secondary winding. Overvoltage detection is performed by a first diode D1, a first potentiometer RP1, and a second diode D2. Overvoltage detection of the voltage input to the first output port is performed by the third resistor R3, the fourth resistor R4, a second potentiometer RP2, and a seventh diode D7. When a short circuit occurs in the load other than the first output port, the second diode D2 in the primary detection module 3 is first broken down, so that the second logic chip J4 first outputs a high level, self-locks the first input terminal of the second logic chip J4, and controls the second switching transistor VT2 to conduct. The second relay switch K2-1 is controlled to be turned off by the second relay switch K2-1. At this time, the first relay switch K1-1 is still in the conducting state. When a short circuit occurs in the load connected to the first output port and the seventh diode D7 is broken down, the second inverter J2 outputs a high level at this time. The second input terminal of the first logic chip J3 is self-locked and controls the first switching transistor VT1 to conduct. The first relay K1 controls the first relay switch K1-1 to be turned off, avoiding the influence of the short circuit on the other output ports.

[0052] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0053] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An ACDC switching power supply safety protection circuit, characterized in that the ACDC switching power supply safety protection circuit includes: a switching power supply module, a multi-output module, a primary detection module, a first protection module, a second protection module, a first output module, a second output module, and an output detection module; the switching power supply module is connected to the output detection module and the multi-output module, and is used to provide AC power and perform rectification and filtering processing on the AC power, and is used to receive the signal output by the output detection module and perform high-frequency regulation on the power input to the multi-output module; the multi-output module is used to cooperate with the switching power supply module and perform high-frequency DC-DC regulation control on the input power, and is used to isolate and equally divide the regulated power into multiple outputs; the primary detection module is connected to the multi-output module, and is used to detect the voltage output by the multi-output module and output a first detection signal, and is used to set a first overvoltage threshold and determine whether the first detection signal is greater than the set first overvoltage threshold, and is used to output a first control signal when the first detection signal is greater than the set first overvoltage threshold; the output detection module is connected to the first output module, and is used to perform voltage detection and overvoltage judgment on the power output by the first output module and output a second control signal when overvoltage occurs, and is used to perform inversion processing on the second control signal and output a third control signal, and is used to transmit the signal obtained by voltage detection to the switching power supply module; the first protection module is connected to the primary detection module, the output detection module, the multi-output module, and the first output module, and is used to transmit the power output by the multi-output module to the first output module through a first relay circuit, and is used to perform inversion processing on the first control signal through a first logic circuit and perform AND logic operation and signal self-locking on the inverted signal and the third control signal, and control the first relay circuit to stop the power transmission work when overvoltage occurs first in the first output module; the second protection module is connected to the primary detection module, the output detection module, the multi-output module, and the second output module, and is used to transmit the power output by the multi-output module to the second output module through a second relay circuit, and is used to perform AND logic operation and signal self-locking on the first control signal and the second control signal through a second logic circuit, and control the second relay circuit to stop the power transmission work when overvoltage occurs first in the second output module; the first output module is used to perform rectification and filtering processing on the power transmitted by the first protection module and output it; the second output module is used to perform rectification and filtering processing on the power transmitted by the second protection module and output it.

2. The ACDC switching power supply safety protection circuit according to claim 1, characterized in that The switching power supply module includes an AC power supply, a first rectifier, a first capacitor, a first resistor, a first power transistor, a pulse regulation device, and an isolation feedback device; the output detection module includes a third resistor and a fourth resistor. The first end and the second end of the AC power supply are respectively connected to the first input end and the second input end of the first rectifier. The first output end of the first rectifier is connected to the first end of the first capacitor. The second end of the first capacitor is connected to the second output end of the first rectifier, the first end of the first resistor and the ground terminal. The second end of the first resistor is connected to the current terminal of the pulse regulating device and the drain of the first power transistor. The source of the first power transistor is connected to the multi-output module. The gate of the first power transistor is connected to the output end of the pulse regulating device. The voltage terminal of the pulse regulating device is connected to the output end of the isolation feedback device. The input end of the isolation feedback device is connected to the first end of the third resistor and grounded through the fourth resistor. The second end of the third resistor is connected to the first output module.

3. The ACDC switching power supply safety protection circuit according to claim 2, wherein The multi-output module includes a first transformer; The first end of the primary winding of the first transformer is connected to the first end of the first capacitor. The second end of the primary winding of the first transformer is connected to the source of the first power transistor. The first secondary winding and the second secondary winding of the first transformer are respectively connected to the first protection module and the second protection module. The auxiliary winding of the first transformer is connected to the primary detection module.

4. The ACDC switching power supply safety protection circuit according to claim 3, characterized in that, The primary detection module includes a first diode, a first potentiometer and a second diode; The anode of the first diode is connected to the first end of the auxiliary winding of the first transformer. The second end of the auxiliary winding of the first transformer is grounded. The cathode of the first diode is connected to the first end and the sliding contact end of the first potentiometer. The second end of the first potentiometer is connected to the cathode of the second diode. The anode of the second diode is connected to the first protection module and the second protection module.

5. The ACDC switching power supply safety protection circuit according to claim 4, characterized in that, The first protection module includes a first relay switch; the first output module includes a fifth diode, a sixth diode, a third capacitor and a first output port; The first end of the first relay switch is connected to the first end of the first secondary winding of the first transformer. The second end of the first relay switch is connected to the anode of the fifth diode. The cathode of the fifth diode is connected to the cathode of the sixth diode, one end of the third capacitor, the second end of the third resistor and the first end of the first output port. The second end of the first output port, the other end of the third capacitor, the anode of the sixth diode and the second end of the secondary winding of the first transformer are all grounded.

6. The ACDC switching power supply safety protection circuit according to claim 3, characterized in that, The second protection module includes a second relay switch; the second output module includes a third diode, a fourth diode, a second capacitor and a second output port; The first end of the second relay switch is connected to the first end of the second secondary winding of the first transformer. The second end of the second relay switch is connected to the anode of the third diode. The cathode of the third diode is connected to the cathode of the fourth diode, one end of the second capacitor and the first end of the second output port. The anode of the fourth diode, the other end of the second capacitor, the second end of the second output port and the second end of the second secondary winding of the first transformer are all grounded.

7. The ACDC switch power supply safety protection circuit according to claim 5, wherein, The output detection module further includes a second potentiometer, a seventh diode, a first inverter; the second protection module further includes a second logic chip, a ninth diode, a second resistor, a second switching transistor, a second relay and a second power supply; One end of the second potentiometer is connected to the first end of the third resistor, the other end of the second potentiometer is connected to the cathode of the seventh diode, the anode of the seventh diode is connected to the input end of the first inverter, the output end of the first inverter is connected to the second input end of the second logic chip, the first input end of the second logic chip is connected to the cathode of the ninth diode and the anode of the second diode, the output end of the second logic chip is connected to the anode of the ninth diode and connected to the base of the second switching tube through the second resistor, the emitter of the second switching tube is grounded, and the collector of the second switching tube is connected to the second power supply through the second relay.

8. The ACDC switching power supply safety protection circuit according to claim 7, characterized in that, The first protection module further includes a second inverter, a first logic chip, an eighth diode, a fifth resistor, a first switching tube, a first relay and a first power supply; The input end of the second inverter is connected to the anode of the second diode, the output end of the second inverter is connected to the first input end of the first logic chip, the second input end of the first logic chip is connected to the cathode of the eighth diode and the anode of the seventh diode, the output end of the first logic chip is connected to the anode of the eighth diode and connected to the base of the first switching tube through the fifth resistor, the emitter of the first switching tube is grounded, and the collector of the first switching tube is connected to the first power supply through the first relay.

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