Output overvoltage input protection circuit with locking function
By designing an output overvoltage input protection circuit that includes a transistor and an optocoupler, the problem of input-side damage caused by output overvoltage of the circuit module is solved. This circuit achieves rapid power cut-off and lockout protection, thereby improving the safety and stability of electronic equipment.
Patent Information
- Application Number
- CN202423321275.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-16
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In modern electronic devices, if an output overvoltage occurs in a circuit module and is not effectively controlled, it can lead to damage on the input side, affecting system stability and safety.
An output overvoltage input protection circuit was designed, which includes a transistor, optocoupler, capacitor and resistor. It has a lockout function, which can quickly cut off the power path when an overvoltage is detected and maintain the protection state until the abnormal situation is resolved.
It enables rapid disconnection of the power path under overvoltage conditions and prevents automatic power restoration through a locking function, significantly improving the safety and stability of the system.
Smart Images
Figure CN223680735U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model embodiment relates to electronic circuit field, especially output overvoltage input protection circuit with locking function. BACKGROUND
[0002] In modern electronic equipment, various power conversion circuits and power amplifier circuit modules are widely used. When these circuits fail or have abnormal conditions, the output voltage may abnormally rise, that is, the output overvoltage phenomenon. If this output overvoltage is not effectively controlled, it will be conducted in reverse to the input side, causing serious damage to the input power supply, front-end control circuit, etc., affecting the stability and reliability of the entire electronic system, and even possibly causing a safety accident, which needs to be solved urgently. SUMMARY
[0003] Therefore, the utility model provides output overvoltage input protection circuit with locking function to solve the problems mentioned in the background technology part.
[0004] To achieve the above purpose, the utility model embodiment adopts the following technical scheme:
[0005] The utility model embodiment provides output overvoltage input protection circuit with locking function, and the circuit comprises: triode Q1, optical coupling light emitting part PC1A, optical coupling light receiving part PC1B, triode Q1, capacitor C1, resistance R1, resistance R2, diode D1, resistance R3, resistance R4, diode DZ1, resistance R5, resistance R6 and resistance R7;The collector of triode Q1 is connected with one end of resistance R7, the other end of resistance R7 is connected with the base of triode Q2 and the negative electrode of optical coupling light emitting part PC1A, the positive electrode of optical coupling light emitting part PC1A is connected with one end of resistance R4, the other end of resistance R4 is connected with the negative electrode of diode D1, the positive electrode of diode D1 is connected with power supply end VCC, one end of resistance R2 and one end of resistance R1, the other end of resistance R1 is connected with one end of resistance R5 and the base of triode Q1, the other end of resistance R5 is connected with the collector of triode Q2, one end of resistance R3 is connected with voltage end V0, the negative electrode of diode DZ1 is connected with the other end of resistance R3, the positive electrode of diode DZ1 is connected with the collector of optical coupling light receiving part PC1B, one end of resistance R6 and one end of capacitor C1, the other end of resistance R6 is connected with the emitter of optical coupling light receiving part PC1B and the other end of capacitor C1 and then grounded GND.
[0006] Preferably, the output overvoltage input protection circuit with locking function further comprises a resistor R8 and a resistor R9; one end of the resistor R8 is connected with the emitter of the transistor Q2 and then connected with the control end CONTROL, one end of the resistor R9 is connected with the other end of the resistor R8 and then connected with the ground GND, and the other end of the resistor R9 is connected with the negative electrode of the light coupling light emitting part PC1A.
[0007] Preferably, the diode DZ1 is a voltage stabilizing diode, but is not limited to.
[0008] Preferably, the transistor Q1 is a PNP type transistor, and the transistor Q2 is an NPN type transistor.
[0009] When the output voltage V0 rises, the voltage stabilizing diode DZ1 is turned on, the light coupling PC1 is turned on, the base stage of the transistor Q2 is powered by the power supply end VCC, the resistor R4 and the resistor R9 are divided to be powered and turned on, the base stage of the transistor Q1 is turned on by the voltage division of the resistor R1, the resistor R5 and the resistor R8 due to the turn-on of the transistor Q2, the voltage of the power supply end VCC is always turned on through the resistor R2, the transistor Q1, the resistor R7 and the resistor R9, the resistor R8 and the e pin of the transistor Q2 are always high level, so that the control circuit is always in a protection state. The utility model not only can cut off the power supply path rapidly when overvoltage is detected, but also introduces a locking function, ensures that the power supply will not be automatically restored before the abnormal condition is removed, greatly improves the safety, and is suitable for popularization and application. BRIEF DESCRIPTION OF DRAWINGS
[0010] In order to more clearly illustrate and understand the technical scheme in the embodiments of the utility model, the following will introduce the drawings needed to be used in the background art, the embodiment description of the utility model, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings without creative labor.
[0011] Figure 1 The utility model provides an output overvoltage input protection circuit structure diagram with locking function. DETAILED DESCRIPTION
[0012] In order to make the purpose, technical scheme and advantage of the embodiments of the utility model more clear, the following will combine the drawings in the embodiments of the utility model, and the technical scheme in the embodiments of the utility model is clearly and completely described, obviously, the described embodiments are some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the range of the utility model protection.
[0013] As Figure 1 shown, Figure 1 The utility model discloses an output overvoltage input protection circuit structure with locking function provides, this embodiment provides an output overvoltage input protection circuit with locking function, this circuit includes: triode Q1, optical coupling luminous part PC1A, optical coupling light receiving part PC1B, triode Q1, electric capacity C1, resistance R1, resistance R2, diode D1, resistance R3, resistance R4, diode DZ1, resistance R5, resistance R6 and resistance R7, the collector of triode Q1 is connected with one end of resistance R7, the other end of resistance R7 is connected with the base of triode Q2, the negative pole of optical coupling luminous part PC1A, the positive pole of optical coupling luminous part PC1A is connected with one end of resistance R4, the other end of resistance R4 is connected with the negative pole of diode D1, the positive pole of diode D1 is connected with power supply end VCC, one end of resistance R2, one end of resistance R1, the other end of resistance R1 is connected with one end of resistance R5, the base of triode Q1, one end of resistance R5 is connected with the collector of triode Q2, one end of resistance R3 is connected with voltage terminal V0, the negative pole of diode DZ1 is connected with the other end of resistance R3, the positive pole of diode DZ1 is connected with the collector of optical coupling light receiving part PC1B, one end of resistance R6, one end of electric capacity C1, the other end of resistance R6 is connected with the emitter of optical coupling light receiving part PC1B, the other end of electric capacity C1 is connected with ground GND after.
[0014] Specifically, the output overvoltage input protection circuit with locking function further comprises resistors R8 and R9; one end of the resistor R8 is connected to the emitter of the triode Q2 and then to the control terminal CONTROL, one end of the resistor R9 is connected to the other end of the resistor R8 and then to the ground GND, and the other end of the resistor R9 is connected to the negative pole of the optical coupling luminous part PC1A.
[0015] Specifically, the diode DZ1 is a voltage stabilizing diode, but is not limited to. The triode Q1 is a PNP type triode, and the triode Q2 is an NPN type triode.
[0016] When the output voltage V0 rises, the voltage stabilizing diode DZ1 is turned on, the optical coupling PC1 is turned on, the base of the triode Q2 is powered by the power supply terminal VCC, the resistance R4 and the resistance R9 are divided to be powered and turned on, and since the triode Q2 is turned on, the base of the triode Q1 is divided by the resistance R1, the resistance R5, and the resistance R8 to be powered and turned on; the voltage of the power supply terminal VCC is always turned on through the resistance R2, the triode Q1, the resistance R7, and the resistance R9, and the e pin of the triode Q2 is always high, so that the control circuit is always in a protection state.
[0017] The output overvoltage input protection circuit with the locking function provided by the embodiment can not only rapidly cut off the power supply path when overvoltage is detected, but also introduces the locking function, ensures that the power supply will not be automatically restored before the abnormal condition is removed, greatly improves the safety, and is suitable for popularization and application.
[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An output overvoltage input protection circuit having a lock function, characterized by comprising: It comprises: A triode Q1, a light coupling light emitting part PC1A, a light coupling light receiving part PC1B, a triode Q1, a capacitor C1, a resistor R1, a resistor R2, a diode D1, a resistor R3, a resistor R4, a diode DZ1, a resistor R5, a resistor R6 and a resistor R7; the collector of the triode Q1 is connected with one end of the resistor R7, the other end of the resistor R7 is connected with the base of the triode Q2 and the negative electrode of the light coupling light emitting part PC1A, the positive electrode of the light coupling light emitting part PC1A is connected with one end of the resistor R4, the other end of the resistor R4 is connected with the negative electrode of the diode D1, the positive electrode of the diode D1 is connected with the power supply end VCC, one end of the resistor R2 and one end of the resistor R1, the other end of the resistor R1 is connected with one end of the resistor R5 and the base of the triode Q1, the other end of the resistor R5 is connected with the collector of the triode Q2, one end of the resistor R3 is connected with the voltage end V0, the negative electrode of the diode DZ1 is connected with the other end of the resistor R3, the positive electrode of the diode DZ1 is connected with the collector of the light coupling light receiving part PC1B, one end of the resistor R6 and one end of the capacitor C1, the other end of the resistor R6 is connected with the emitter of the light coupling light receiving part PC1B and the other end of the capacitor C1 and then grounded GND.
2. The output overvoltage input protection circuit with a locking function according to claim 1, characterized in that, It also comprises a resistor R8 and a resistor R9; one end of the resistor R8 is connected with the emitter of the triode Q2 and then connected with the control end CONTROL, one end of the resistor R9 is connected with the other end of the resistor R8 and then grounded GND, the other end of the resistor R9 is connected with the negative electrode of the light coupling light emitting part PC1A.
3. The output overvoltage input protection circuit with locking function according to any one of claims 1 or 2, characterized in that, The diode DZ1 adopts but is not limited to a voltage stabilizing diode.
4. The output overvoltage input protection circuit with a locking function according to one of claims 1 to 3, characterized in that, The triode Q1 adopts a PNP type triode; the triode Q2 adopts an NPN type triode.