Output over-current automatic turn-off circuit suitable for non-CPU (Central Processing Unit) control

Abstract

The invention relates to an open-out overcurrent automatic turn-off circuit suitable for non-CPU control. The open-out overcurrent automatic turn-off circuit comprises a self-locking turn-off circuit, an overcurrent detection circuit and an open-out circuit. The self-locking turn-off circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first triode, a second triode, a third triode, a fourth triode and a first diode; the overcurrent detection circuit comprises an eighth resistor, a ninth resistor, a tenth resistor and a fifth triode; and the output circuit comprises a seventh resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a fifth capacitor, a sixth triode, a third diode, a second voltage-regulator tube and a seventh field-effect tube. According to the invention, the resistor and the triode form a detection circuit, the resistor, the capacitor and the triode form a self-locking turn-off circuit, and overcurrent protection of an output loop can still be realized through an analog circuit under the condition of no CPU control signal.

Description

Technical Field

[0001] The invention relates to an over-current automatic shut-off circuit, and specifically discloses an output over-current automatic shut-off circuit suitable for non-CPU control. Background Art

[0002] In the motor control circuit of aerospace applications, the output circuit is usually used as a power switch to control the power supply of subsequent circuits. When the motor controller has no CPU or insufficient communication lines to communicate with the external CPU due to structural and process constraints, the design of the motor controller will be restricted, and a CPU-free output overcurrent automatic shutdown circuit is needed. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an output overcurrent automatic shutdown circuit suitable for non-CPU control, which uses a few analog devices to replace the CPU to complete overcurrent monitoring and continuous protection.

[0004] According to the technical solution provided by the present invention, the output overcurrent automatic shutdown circuit applicable to non-CPU control includes a self-locking shutdown circuit, an overcurrent detection circuit and an output circuit; The self-locking shutdown circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first triode, a second triode, a third triode, a fourth triode and a first diode; The overcurrent detection circuit comprises an eighth resistor, a ninth resistor, a tenth resistor and a fifth triode; The output circuit includes a seventh resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a fifth capacitor, a sixth triode, a third diode, a second voltage regulator and a seventh field effect transistor; The circuit enable signal is connected to one end of a fifteenth resistor, the other end of the fifteenth resistor is connected to the base of a sixth transistor, the emitter of the sixth transistor is grounded, the fourteenth resistor and the fifth capacitor are connected in parallel at both ends of the emitter junction of the sixth transistor, the collector of the sixth transistor is connected to one end of a twelfth resistor, the other end of the twelfth resistor is connected to the cathode of the third diode, one end of the eleventh resistor and one end of the thirteenth resistor, the anode of the third diode is connected to the collector of the fifth transistor in the overcurrent detection circuit, and the other end of the thirteenth resistor is connected to the gate of the seventh field effect transistor; The second DC power supply is connected to one end of the seventh resistor and the emitter of the fifth transistor, the other end of the seventh resistor is connected to one end of the eighth resistor, the other end of the eleventh resistor in the output circuit, the negative electrode of the second voltage regulator and the source of the seventh field effect transistor, the positive electrode of the second voltage regulator is connected to the gate of the seventh field effect transistor, the drain of the seventh field effect transistor is connected, the other end of the eighth resistor is connected to the base of the fifth transistor, the collector of the fifth transistor is connected to one end of the ninth resistor and the positive electrode of the third diode, the other end of the ninth resistor is connected to one end of the tenth resistor, the other end of the tenth resistor is grounded, and the voltage dividing point between the ninth resistor and the tenth resistor is connected to the base of the fourth transistor in the self-locking shutdown circuit; The first DC power supply is connected to one end of the fifth resistor and one end of the third capacitor, the fifth resistor and the third capacitor are connected in parallel, the other end of the fifth resistor and the other end of the third capacitor are commonly connected to the cathode of the first diode and one end of the sixth resistor, the anode of the first diode is connected to the base of the sixth transistor in the output circuit, the other end of the sixth resistor is connected to the collector of the fourth transistor, the emitter of the fourth transistor is grounded, and the fourth capacitor is connected in parallel to both ends of the emitter junction of the fourth transistor; The voltage dividing point between the fifth resistor and the sixth resistor is connected to one end of the third resistor and the collector of the second diode, the other end of the third resistor is connected to the base of the first transistor, the emitter of the first transistor is connected back to the first DC power supply, the collector of the first transistor is connected to one end of the first resistor, and the other end of the first resistor is connected to the emitter of the second transistor and the collector of the third transistor; the base of the second transistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to the collector of the first transistor, the emitter of the second transistor is connected to the collector of the third transistor, the first capacitor is connected in parallel to both ends of the emitter junction of the second transistor, the base of the third transistor is connected to one end of the second resistor, the other end of the second resistor is connected to the circuit enable signal, the emitter of the third transistor is grounded, and the second capacitor is connected in parallel to both ends of the emitter junction of the third transistor.

[0005] Preferably, the first transistor and the fifth transistor are of PNP type, the second transistor, the third transistor, the fourth transistor and the sixth transistor are of NPN type, and the seventh field effect transistor is of P-channel type.

[0006] Preferably, the voltage of the first DC power supply is 15V, and the voltage of the second DC power supply is 28V.

[0007] Preferably, the resistance values ​​of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the fourteenth resistor and the fifteenth resistor are equal, the resistance values ​​of the eighth resistor and the thirteenth resistor are equal, and the resistance values ​​of the tenth resistor and the eleventh resistor are equal.

[0008] Further preferably, the resistance values ​​of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the fourteenth resistor and the fifteenth resistor are all equal to 10kΩ, the resistance value of the sixth resistor is equal to 20kΩ, the resistance value of the seventh resistor is equal to 0.24Ω, the resistance values ​​of the eighth resistor and the thirteenth resistor are both equal to 200Ω, the resistance value of the ninth resistor is equal to 100kΩ, the resistance values ​​of the tenth resistor and the eleventh resistor are both equal to 15kΩ, and the resistance value of the twelfth resistor is equal to 12kΩ.

[0009] Preferably, the capacitances of the first capacitor, the second capacitor, the fourth capacitor and the fifth capacitor are equal.

[0010] Further preferably, the capacitances of the first capacitor, the second capacitor, the fourth capacitor and the fifth capacitor are all equal to 100 nF, and the capacitance of the third capacitor is equal to 10 nF.

[0011] The present invention uses a resistor and a triode to form a detection circuit, uses a resistor, a capacitor and a triode to form a self-locking shutdown circuit, and can still achieve overcurrent protection for the open circuit in the absence of a CPU control signal through an analog circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a circuit schematic diagram of the present invention. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0014] A circuit suitable for automatic shutdown of output overcurrent without CPU control, such as Figure 1 As shown, it includes a self-locking shutdown circuit 1, an overcurrent detection circuit 2 and an output circuit 3; The self-locking shutdown circuit 1 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first triode V1, a second triode V2, a third triode V3, a fourth triode V4 and a first diode VD1; wherein the first resistor R1 is equal to 10kΩ, the second resistor R2 is equal to 10kΩ, the third resistor R3 is equal to 10kΩ, the fourth resistor R4 is equal to 10kΩ, Equal to 10kΩ, the fifth resistor R5 equal to 10kΩ, the sixth resistor R6 equal to 20kΩ, the first capacitor C1 equal to 100nF, the second capacitor C2 equal to 100nF, the third capacitor C3 equal to 10nF, the fourth capacitor C4 equal to 100nF, the first transistor V1 adopts BT5401, the second transistor V2 adopts BT5551, the third transistor V3 adopts BT5551, the fourth transistor V4 adopts BT5551, and the first diode VD1 adopts 1N4148H.

[0015] When the circuit is enabled and there is no overcurrent, the third transistor V3 is turned on, the fourth transistor V4 is not turned on, and the emitter junction voltages of the first transistor V1 and the second transistor V2 do not meet the conduction condition and are both turned off. At this time, the cathode voltage of the first diode VD1 is 15V, and the anode voltage of the first diode VD1 is less than the divided voltage of 7.5V of the fifteenth resistor R15 and the fourteenth resistor R14 in the output circuit 3. The first diode VD1 is cut off, which does not affect the normal operation of the output circuit 3. When the circuit is enabled and overcurrent occurs, the third transistor V3 and the fourth transistor V4 are both turned on, and the fifth resistor R5 and the sixth resistor R6 divide the voltage, so that the first transistor V1 is turned on, and then the second transistor V2 is turned on. At this time, the cathode voltage of the first diode VD1 is grounded through the second transistor V2 and the third transistor V3, which is a low voltage. The anode voltage of the first diode VD1, 7.5V, is greater than its cathode voltage. The first diode VD1 is turned on, clamping the anode voltage to about 0.7V, and turning off the sixth transistor V6 in the output circuit 3 to protect the circuit. When the circuit is turned off in this way, the fourth transistor V4 returns to the cut-off state, but because the first transistor V1 and the second transistor V2 are already turned on, the cathode of the first diode VD1 will remain in a low level state and will not return to a high level, stabilizing in this state and controlling the shutdown of the output circuit 3.

[0016] The overcurrent detection circuit 2 includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a fifth transistor V5; wherein the eighth resistor R8 is equal to 200Ω, the ninth resistor R9 is equal to 100kΩ, the tenth resistor R10 is equal to 15kΩ, and the fifth transistor V5 adopts BT5401.

[0017] The fifth transistor V5 and the eighth resistor R8 jointly detect the voltage across the seventh resistor R7 in the output circuit 3. When no overcurrent occurs, the fifth transistor V5 is cut off, the ninth resistor R9 and the tenth resistor R10 are divided into a low voltage level, and the fourth transistor V4 in the self-locking shutdown circuit 1 is controlled to be cut off, and the circuit operates normally without self-locking; when overcurrent occurs, the emitter junction voltage of the fifth transistor V5 increases and turns on, the ninth resistor R9 and the tenth resistor R10 are divided into a high voltage level, and the fourth transistor V4 in the self-locking shutdown circuit 1 is controlled to be turned on, the self-locking shutdown circuit 1 is locked, and the output circuit 3 is closed.

[0018] The output circuit 3 includes a seventh resistor R7, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a fifth capacitor C5, a sixth transistor V6, a third diode VD3, a second voltage regulator VD2 and a seventh field effect transistor V7; wherein the seventh resistor R7 is equal to 0.24Ω, the eleventh resistor R11 is equal to 15kΩ, the twelfth resistor R12 is equal to 12kΩ, the thirteenth resistor R13 is equal to 200Ω, the fourteenth resistor R14 is equal to 10kΩ, the fifteenth resistor R15 is equal to 10kΩ, the fifth capacitor C5 is equal to 100nF, the sixth transistor V6 adopts BT5551, the third diode VD3 adopts 1N4148H, the second voltage regulator VD2 adopts MM3Z15V, and the seventh field effect transistor V7 adopts CS12P100U.

[0019] The circuit enable signal Enable is set high, the sixth transistor V6 is turned on, the eleventh resistor R11 and the twelfth resistor R12 divide the voltage, so that the gate-source voltage of the seventh field effect tube V7 is less than 0 and turned on, the circuit output VOUT connection is turned on, and the power supply starts. The function of the second voltage regulator tube VD2 is to clamp the gate and source voltages of the seventh field effect tube V7, and turn on the voltage regulator protection when an excessively high peak occurs. The function of the third diode VD3 is to prevent the voltage division of the eleventh resistor R11 and the twelfth resistor R12 from affecting the BIT signal detection function of the overcurrent detection circuit 2. At the same time, when the circuit overcurrent causes the fifth transistor to be turned on, it works together with the fifth transistor V5 to reduce the gate and source voltages of the seventh field effect tube V7, so that its working state changes from the saturation area to the linear area (variable resistance area), and further reduce the current flowing through the seventh field effect tube V7 to prevent it from being burned due to excessive power.

[0020] In the present invention, the circuit enable signal Enable is connected to one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected to the base of the sixth transistor V6, the emitter of the sixth transistor V6 is grounded, the fourteenth resistor R14 and the fifth capacitor C5 are connected in parallel at both ends of the emitter junction of the sixth transistor V6, the collector of the sixth transistor V6 is connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected to the cathode of the third diode VD3, one end of the eleventh resistor R11 and one end of the thirteenth resistor R13, the anode of the third diode VD3 is connected to the collector of the fifth transistor V5 in the overcurrent detection circuit 2, and the other end of the thirteenth resistor R13 is connected to the gate of the seventh field effect transistor V7; The second DC power supply VDD is connected to one end of the seventh resistor R7 and the emitter of the fifth transistor V5, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, the other end of the eleventh resistor R11 in the output circuit 3, the negative electrode of the second voltage regulator tube VD2 and the source of the seventh field effect tube V7, the positive electrode of the second voltage regulator tube VD2 is connected to the gate of the seventh field effect tube V7, the drain of the seventh field effect tube V7 is connected to the output, that is, the output of the output circuit VOUT, the other end of the eighth resistor R8 is connected to the base of the fifth transistor V5, the collector of the fifth transistor V5 is connected to one end of the ninth resistor R9 and the positive electrode of the third diode VD3, the other end of the ninth resistor R9 is connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is grounded, and the voltage dividing point between the ninth resistor R9 and the tenth resistor R10 is connected to the base of the fourth transistor V4 in the self-locking shutdown circuit 1; The first DC power supply VCC is connected to one end of the fifth resistor R5 and one end of the third capacitor C3, the fifth resistor R5 and the third capacitor C3 are connected in parallel, the other end of the fifth resistor R5 and the other end of the third capacitor C3 are commonly connected to the cathode of the first diode VD1 and one end of the sixth resistor R6, the anode of the first diode VD1 is connected to the base of the sixth transistor V6 in the output circuit 3, the other end of the sixth resistor R6 is connected to the collector of the fourth transistor V4, the emitter of the fourth transistor V4 is grounded, and the fourth capacitor C4 is connected in parallel to both ends of the emitter junction of the fourth transistor V4; A voltage dividing point between the fifth resistor R5 and the sixth resistor R6 is connected to one end of the third resistor R3 and the collector of the second diode V2, the other end of the third resistor R3 is connected to the base of the first triode V1, the emitter of the first triode V1 is connected back to the first DC power supply VCC, the collector of the first triode V1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the emitter of the second triode V2 and the collector of the third triode V3; the base of the second triode V2 is connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to the collector of the first triode V1, the emitter of the second triode V2 is connected to the collector of the third triode V3, the first capacitor C1 is connected in parallel to both ends of the emitter junction of the second triode V2, the base of the third triode V3 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to the circuit enable signal Enable, the emitter of the third triode V3 is grounded, and the second capacitor C2 is connected in parallel to both ends of the emitter junction of the third triode V3.

[0021] The working principle of the control circuit and the protection circuit of the present invention is: After the circuit enable signal Enable is set high, the self-locking shutdown circuit 1, the overcurrent detection circuit 2 and the output circuit 3 enter the working state. When there is no overcurrent, the output circuit 3 works normally, and the voltage division on the seventh resistor R7 is not enough to turn on the fifth transistor V5 of the overcurrent detection circuit 2, and then the first transistor V1, the second transistor V2, and the fourth transistor V4 in the self-locking shutdown circuit 1 are all turned off.

[0022] When the current increases to the overcurrent protection threshold, the fifth transistor V5 of the overcurrent detection circuit 2 is turned on. On the one hand, the DC power supply VDD clamps the seventh field effect transistor V7 through the fifth transistor V5 and the third diode VD3, so that the working area is changed from the saturation area to the linear area (variable resistance area), the on-resistance of the seventh field effect transistor is increased, the current is reduced, and the circuit is protected; on the other hand, the fifth transistor V5 of the overcurrent detection circuit 2 is turned on, and then the ninth resistor R9 and the tenth resistor R10 divide the voltage, so that the fourth transistor V4 in the self-locking shutdown circuit 1 is turned on, and the base voltage of the first transistor V1 is lowered, so that the first transistor V1 is turned on, and then the base voltage of the second transistor V2 is pulled up to the first DC power supply VCC, the second transistor V2 is turned on, and the third transistor V3 remains turned on under the action of the circuit enable signal Enable. Under the joint action of the voltage division of the first resistor R1, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 and the first transistor V1, the second transistor V2, and the third transistor V3, the circuit state remains stable; when the current returns to normal, the fifth transistor V5 and the fourth transistor V4 are turned off successively, and the circuit is automatically turned off continuously, and circuit instability caused by repeated current jumps will not occur.

[0023] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A circuit suitable for automatic shutdown of output overcurrent without CPU control, characterized by: It includes a self-locking shutdown circuit (1), an overcurrent detection circuit (2) and an output circuit (3); The self-locking shutdown circuit (1) comprises a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a first triode (V1), a second triode (V2), a third triode (V3), a fourth triode (V4) and a first diode (VD1); The overcurrent detection circuit (2) comprises an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10) and a fifth triode (V5); The output circuit (3) comprises a seventh resistor (R7), an eleventh resistor (R11), a twelfth resistor (R12), a thirteenth resistor (R13), a fourteenth resistor (R14), a fifteenth resistor (R15), a fifth capacitor (C5), a sixth triode (V6), a third diode (VD3), a second voltage regulator (VD2) and a seventh field effect transistor (V7); A circuit enable signal (Enable) is connected to one end of a fifteenth resistor (R15), the other end of the fifteenth resistor (R15) is connected to the base of a sixth transistor (V6), the emitter of the sixth transistor (V6) is grounded, a fourteenth resistor (R14) and a fifth capacitor (C5) are connected in parallel at both ends of the emitter junction of the sixth transistor (V6), the collector of the sixth transistor (V6) is connected to one end of a twelfth resistor (R12), the other end of the twelfth resistor (R12) is connected to the cathode of a third diode (VD3), one end of an eleventh resistor (R11) and one end of a thirteenth resistor (R13), the anode of the third diode (VD3) is connected to the collector of a fifth transistor (V5) in the overcurrent detection circuit (2), and the other end of the thirteenth resistor (R13) is connected to the gate of a seventh field effect transistor (V7); The second DC power supply (VDD) is connected to one end of the seventh resistor (R7) and the emitter of the fifth triode (V5), the other end of the seventh resistor (R7) is connected to one end of the eighth resistor (R8), the other end of the eleventh resistor (R11) in the output circuit (3), the cathode of the second voltage regulator (VD2) and the source of the seventh field effect transistor (V7), the anode of the second voltage regulator (VD2) is connected to the gate of the seventh field effect transistor (V7), and the drain of the seventh field effect transistor (V7) is connected to the output circuit. output (VOUT), the other end of the eighth resistor (R8) is connected to the base of the fifth transistor (V5), the collector of the fifth transistor (V5) is connected to one end of the ninth resistor (R9) and the positive electrode of the third diode (VD3), the other end of the ninth resistor (R9) is connected to one end of the tenth resistor (R10), the other end of the tenth resistor (R10) is grounded, and the voltage dividing point between the ninth resistor (R9) and the tenth resistor (R10) is connected to the base of the fourth transistor (V4) in the self-locking shutdown circuit (1); A first DC power supply (VCC) is connected to one end of a fifth resistor (R5) and one end of a third capacitor (C3); the fifth resistor (R5) and the third capacitor (C3) are connected in parallel; the other end of the fifth resistor (R5) and the other end of the third capacitor (C3) are connected to the cathode of a first diode (VD1) and one end of a sixth resistor (R6); the anode of the first diode (VD1) is connected to the base of a sixth transistor (V6) in an output circuit (3); the other end of the sixth resistor (R6) is connected to the collector of a fourth transistor (V4); the emitter of the fourth transistor (V4) is grounded; and the fourth capacitor (C4) is connected in parallel to both ends of the emitter junction of the fourth transistor (V4); The voltage dividing point between the fifth resistor (R5) and the sixth resistor (R6) is connected to one end of the third resistor (R3) and the collector of the second diode (V2); the other end of the third resistor (R3) is connected to the base of the first triode (V1); the emitter of the first triode (V1) is connected back to the first DC power supply (VCC); the collector of the first triode (V1) is connected to one end of the first resistor (R1); the other end of the first resistor (R1) is connected to the emitter of the second triode (V2) and the collector of the third triode (V3); the base of the second triode (V2) is connected to the fourth One end of the resistor (R4) and the other end of the fourth resistor (R4) are connected to the collector of the first triode (V1), the emitter of the second triode (V2) is connected to the collector of the third triode (V3), the first capacitor (C1) is connected in parallel to both ends of the emitter junction of the second triode (V2), the base of the third triode (V3) is connected to one end of the second resistor (R2), the other end of the second resistor (R2) is connected to the circuit enable signal (Enable), the emitter of the third triode (V3) is grounded, and the second capacitor (C2) is connected in parallel to both ends of the emitter junction of the third triode (V3).

2. The output overcurrent automatic shutdown circuit suitable for non-CPU control as claimed in claim 1, characterized in that: The first transistor (V1) and the fifth transistor (V5) are of PNP type, the second transistor (V2), the third transistor (V3), the fourth transistor (V4) and the sixth transistor (V6) are of NPN type, and the seventh field effect transistor (V7) is of P channel type.

3. The output overcurrent automatic shutdown circuit suitable for non-CPU control as claimed in claim 1, characterized in that: The voltage of the first DC power supply (VCC) is 15V, and the voltage of the second DC power supply (VDD) is 28V.

4. The output overcurrent automatic shutdown circuit suitable for non-CPU control as claimed in claim 1, characterized in that: The resistance values ​​of the first resistor (R1), the second resistor (R2), the third resistor (R3), the fourth resistor (R4), the fifth resistor (R5), the fourteenth resistor (R14) and the fifteenth resistor (R15) are equal, the resistance values ​​of the eighth resistor (R8) and the thirteenth resistor (R13) are equal, and the resistance values ​​of the tenth resistor (R10) and the eleventh resistor (R11) are equal.

5. The output overcurrent automatic shutdown circuit suitable for non-CPU control as claimed in claim 4, characterized in that: The resistance values ​​of the first resistor (R1), the second resistor (R2), the third resistor (R3), the fourth resistor (R4), the fifth resistor (R5), the fourteenth resistor (R14) and the fifteenth resistor (R15) are all equal to 10 kΩ, the resistance value of the sixth resistor (R6) is equal to 20 kΩ, the resistance value of the seventh resistor (R7) is equal to 0.24 Ω, the resistance values ​​of the eighth resistor (R8) and the thirteenth resistor (R13) are all equal to 200 Ω, the resistance value of the ninth resistor (R9) is equal to 100 kΩ, the resistance values ​​of the tenth resistor (R10) and the eleventh resistor (R11) are all equal to 15 kΩ, and the resistance value of the twelfth resistor (R12) is equal to 12 kΩ.

6. The output overcurrent automatic shutdown circuit suitable for non-CPU control as claimed in claim 1, characterized in that: The capacitances of the first capacitor (C1), the second capacitor (C2), the fourth capacitor (C4) and the fifth capacitor (C5) are equal.

7. The output overcurrent automatic shutdown circuit suitable for non-CPU control as claimed in claim 6, characterized in that: The capacitances of the first capacitor (C1), the second capacitor (C2), the fourth capacitor (C4) and the fifth capacitor (C5) are all equal to 100 nF, and the capacitance of the third capacitor (C3) is equal to 10 nF.

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