Self-locking protection control circuit

Abstract

The utility model discloses a kind of with self-locking protection control circuit, it is related to safety protection field, the self-locking protection control circuit of this with including: indicator light operating module, for when load normal work, green light indication, when load works abnormally, red light indication;Relay operating module, for when load normal work, relay switch is in normally closed state, when load works abnormally, relay switch is in normally open state;Load operating module, for load power work;The beneficial effects of the utility model are: the utility model will disconnect the loop where load is when load works abnormally, avoid load continuous abnormal work damage circuit;The component cost of entire circuit selected is cheap, all adopt ordinary conventional device, economic benefit is very considerable;The utility model does not need MCU control, commonality and timeliness are good, and reliability is high;Selected device and material are all general piece, the industrialization of circuit is very easy to realize, with the significance of promotion.

Description

Technical Field

[0001] This utility model relates to the field of safety protection, specifically a self-locking protection control circuit. Background Technology

[0002] Among various AC-powered electrical products, such as motors, pumps, and fans, load devices are prone to abnormal conditions such as short circuits, overloads, and stalling due to complex working environments or sudden load changes. If the power supply is not cut off in time, it will not only damage the equipment itself but may also cause safety accidents.

[0003] Currently, common load protection solutions mainly include fuses, thermal relays, electronic protection circuits, and microcontroller (MCU)-based intelligent protection systems. While fuses and thermal relays are simple in structure and low in cost, they have slow response times, are inconvenient to reset, and are one-time or mechanical protections, unable to achieve automatic recovery or status indication. Electronic protection circuits, although having faster response times, are typically complex in structure, expensive, and rely on multiple active components, making their reliability highly susceptible to environmental influences. MCU-based protection systems, while flexible in function, require programming and peripheral circuit support, resulting in high costs, long development cycles, and susceptibility to program errors or malfunctions in environments with strong interference, affecting system stability and reliability.

[0004] Therefore, it is necessary to provide a control circuit that is simple in structure, low in cost, requires no MCU control, has self-locking protection function, and is highly reliable, in order to solve the above-mentioned problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a control circuit with self-locking protection to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A control circuit with self-locking protection includes:

[0008] The indicator light module is used to indicate that the load is working normally with a green light and that the load is malfunctioning with a red light.

[0009] The relay working module is used to keep the relay switch in the normally closed state when the load is working normally, and in the normally open state when the load is working abnormally.

[0010] Load working module, used for load to operate when powered;

[0011] The loop control module is used to detect whether the load is working properly. When the load is working properly, it constructs the loop of the line where the load is located; when the load is working abnormally, it constructs the loop of the line where the relay is located; and based on the constructed different loops, it changes the working loop of the indicator light to realize green light or red light indication.

[0012] The first end of the indicator light module is connected to the first end of the relay module, the second end of the indicator light module is connected to the second end of the relay module and the first end of the circuit control module, the third end of the relay module is connected to the first end of the load module, and the second end of the load module is connected to the second end of the circuit control module.

[0013] As a further embodiment of this utility model: the indicator light working module includes a switch S1, a resistor R1, a diode D1, a resistor R2, an indicator light LED1, a resistor R5, a diode D4, one end of the switch S1 is connected to the live wire L, the other end of the switch S1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the positive terminal of the diode D1, the negative terminal of the diode D1 is connected to the first terminal of the relay working module and one end of the resistor R2, the other end of the resistor R2 is connected to the first terminal of the indicator light LED1, the second terminal of the indicator light LED1 is connected to the neutral wire N through the resistor R5, the third terminal of the indicator light LED1 is connected to the positive terminal of the diode D4, and the negative terminal of the diode D4 is connected to the second terminal of the relay working module and the first terminal of the circuit control module.

[0014] As a further embodiment of this utility model: the relay working module includes diode D2, relay RY1, and capacitor C2. The negative terminal of diode D2 is connected to the first terminal of relay RY1, the negative terminal of diode D1, and one terminal of capacitor C2. The second terminal of relay RY1 is connected to the negative terminal of diode D4 and the positive terminal of diode D2. The other terminal of capacitor C2 is grounded. The third terminal of relay RY1 is connected to the first terminal of the load working module. The fourth terminal of relay RY1 is connected to the other terminal of switch S1.

[0015] As a further embodiment of this utility model: the load working module includes a rectifier DB1, an inductor L1, an inductor L2, a capacitor C1, and a load M1 (specifically a motor). The first end of the rectifier DB1 is connected to the third end of the relay working module, the second end of the rectifier DB1 is connected to the second end of the circuit control module, the third end of the rectifier DB1 is connected to one end of the inductor L1, the fourth end of the rectifier DB1 is connected to one end of the inductor L2, the other end of the inductor L1 is connected to one end of the capacitor C1 and one end of the load M1, and the other end of the inductor L2 is connected to the other end of the capacitor C1 and the other end of the load M1.

[0016] As a further embodiment of this utility model: the circuit control module includes a diode D3, a potentiometer RW1, a resistor R3, a resistor R4, a resistor R6, a capacitor C3, and a unidirectional thyristor TR1. The positive terminal of the diode D3 is connected to one end of the resistor R3 and the second terminal of the load working module. The other end of the resistor R3 is connected to the neutral line N, one end of the capacitor C3, the negative terminal of the unidirectional thyristor TR1, and one end of the resistor R6. The negative terminal of the diode D3 is connected to one end of the potentiometer RW1. The other end of the potentiometer RW1 is connected to one end of the resistor R4. The other end of the resistor R4 is connected to the other end of the resistor R6, the other end of the capacitor C3, and the control terminal of the unidirectional thyristor TR1. The positive terminal of the unidirectional thyristor TR1 is connected to the second terminal of the indicator light working module and the second terminal of the relay working module.

[0017] Compared with the prior art, the beneficial effects of this utility model are: this utility model will disconnect the circuit where the load is located when the load is working abnormally, so as to avoid the continuous abnormal operation of the load and damage to the circuit; the components selected in the entire circuit are low cost, and all of them are ordinary conventional components, which is very economical; this utility model does not require MCU control, has good versatility and timeliness, and high reliability; the selected components and materials are all general-purpose components, and the industrialization of the circuit is easy to realize, which has the significance of promotion. Attached Figure Description

[0018] Figure 1 This is a circuit diagram of a control circuit with self-locking protection. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1 A control circuit with self-locking protection includes:

[0021] The indicator light module is used to indicate that the load is working normally with a green light and that the load is malfunctioning with a red light.

[0022] The relay working module is used to keep the relay switch in the normally closed state when the load is working normally, and in the normally open state when the load is working abnormally.

[0023] Load working module, used for load to operate when powered;

[0024] The loop control module is used to detect whether the load is working properly. When the load is working properly, it constructs the loop of the line where the load is located; when the load is working abnormally, it constructs the loop of the line where the relay is located; and based on the constructed different loops, it changes the working loop of the indicator light to realize green light or red light indication.

[0025] The first end of the indicator light module is connected to the first end of the relay module, the second end of the indicator light module is connected to the second end of the relay module and the first end of the circuit control module, the third end of the relay module is connected to the first end of the load module, and the second end of the load module is connected to the second end of the circuit control module.

[0026] In this embodiment: Please refer to Figure 1 The indicator light working module includes a switch S1, a resistor R1, a diode D1, a resistor R2, an indicator light LED1, a resistor R5, a diode D4, one end of the switch S1 is connected to the live wire L, the other end of the switch S1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the positive terminal of the diode D1, the negative terminal of the diode D1 is connected to the first terminal of the relay working module and one end of the resistor R2, the other end of the resistor R2 is connected to the first terminal of the indicator light LED1, the second terminal of the indicator light LED1 is connected to the neutral wire N through the resistor R5, the third terminal of the indicator light LED1 is connected to the positive terminal of the diode D4, and the negative terminal of the diode D4 is connected to the second terminal of the relay working module and the first terminal of the circuit control module.

[0027] When load M1 is working normally, the live wire L, switch S1, resistor R1, diode D1, resistor R2, indicator light LED1, resistor R5, and neutral wire N form a circuit, causing the green light inside indicator light LED1 to light up.

[0028] When load M1 malfunctions, the circuit control module will turn on the unidirectional thyristor TR1. The live wire L, switch S1, resistor R1, diode D1, resistor R2, indicator light LED1, diode D4, unidirectional thyristor TR1, and neutral wire N form a circuit, causing the red light inside indicator light LED1 to light up.

[0029] In this embodiment: Please refer to Figure 1 The relay working module includes diode D2, relay RY1, and capacitor C2. The negative terminal of diode D2 is connected to the first terminal of relay RY1, the negative terminal of diode D1, and one terminal of capacitor C2. The second terminal of relay RY1 is connected to the negative terminal of diode D4 and the positive terminal of diode D2. The other terminal of capacitor C2 is grounded. The third terminal of relay RY1 is connected to the first terminal of the load working module, and the fourth terminal of relay RY1 is connected to the other terminal of switch S1.

[0030] When load M1 is working normally, unidirectional thyristor TR1 is cut off, relay RY1 cannot be powered, so that the switch of relay RY1 remains closed.

[0031] When load M1 is malfunctioning, the circuit control module will turn on the unidirectional thyristor TR1. The live wire L, switch S1, resistor R1, diode D1, relay RY1, unidirectional thyristor TR1, and neutral wire N form a circuit. The relay RY1 is energized and the control switch is turned off.

[0032] In this embodiment: Please refer to Figure 1 The load working module includes a rectifier DB1, an inductor L1, an inductor L2, a capacitor C1, and a load M1 (specifically a motor). The first end of the rectifier DB1 is connected to the third end of the relay working module, the second end of the rectifier DB1 is connected to the second end of the circuit control module, the third end of the rectifier DB1 is connected to one end of the inductor L1, the fourth end of the rectifier DB1 is connected to one end of the inductor L2, the other end of the inductor L1 is connected to one end of the capacitor C1 and one end of the load M1, and the other end of the inductor L2 is connected to the other end of the capacitor C1 and the other end of the load M1.

[0033] When the relay RY1 is in the closed state, the live wire L, the switch S1, the relay RY1, the rectifier DB1, the inductor L1, the load M1, the inductor L2, the rectifier DB1, the resistor R3, and the neutral wire N form a circuit, and the load M1 is energized and works.

[0034] In this embodiment: Please refer to Figure 1 The circuit control module includes diode D3, potentiometer RW1, resistors R3, R4, and R6, capacitor C3, and unidirectional thyristor TR1. The positive terminal of diode D3 is connected to one end of resistor R3 and the second terminal of the load working module. The other end of resistor R3 is connected to the neutral line N. One end of capacitor C3 is connected to the negative terminal of unidirectional thyristor TR1 and one end of resistor R6. The negative terminal of diode D3 is connected to one end of potentiometer RW1. The other end of potentiometer RW1 is connected to one end of resistor R4. The other end of resistor R4 is connected to the other end of resistor R6, the other end of capacitor C3, and the control terminal of unidirectional thyristor TR1. The positive terminal of unidirectional thyristor TR1 is connected to the second terminal of the indicator light working module and the second terminal of the relay working module.

[0035] When load M1 malfunctions (short circuit, jamming, etc.), the current flowing through resistor R3 in the circuit containing load M1 will increase, generating a voltage drop across resistor R3. This voltage is divided by diode D3, potentiometer RW1, resistor R4, and resistor R6, making the voltage across resistor R6 sufficient to turn on the unidirectional thyristor TR1. This, in turn, forms the circuit for relay RY1 (disconnecting the load M1 circuit and providing protection), changing the circuit of indicator LED1 (LED1 lights up red, indicating a fault).

[0036] This circuit cleverly utilizes resistor R3 to monitor the current of load M1 during operation. When load M1 malfunctions, the voltage generated across resistor R3 causes the unidirectional thyristor TR1 to conduct. It cleverly leverages the characteristic that once triggered, TR1 remains on until power is cut off, ensuring that if an abnormality occurs at load M1, the self-locking relay RY1 disconnects load M1 without power interruption, while indicator LED1 provides a warning, effectively guaranteeing product safety.

[0037] The working principle of this utility model is as follows: the indicator light module is used to indicate green when the load is working normally and red when the load is malfunctioning; the relay module is used to keep the relay switch in a normally closed state when the load is working normally and in a normally open state when the load is malfunctioning; the load module is used to ensure the load is powered on; the circuit control module is used to detect whether the load is working normally, and when the load is working normally, it constructs the circuit of the line where the load is located; when the load is malfunctioning, it constructs the circuit of the line where the relay is located; and based on the constructed different circuits, it changes the working circuit of the indicator light to achieve green or red light indication.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and 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. A control circuit with self-locking protection, characterized in that, The self-locking protection control circuit includes: The indicator light module is used to indicate that the load is working normally with a green light and that the load is malfunctioning with a red light. The relay working module is used to keep the relay switch in a normally closed state when the load is working normally, and to keep the relay switch in a normally open state when the load is working abnormally. Load working module, used for load to operate when powered; The loop control module is used to detect whether the load is working properly. When the load is working properly, it constructs the loop of the line where the load is located; when the load is working abnormally, it constructs the loop of the line where the relay is located; and based on the constructed different loops, it changes the working loop of the indicator light to realize green light or red light indication. The first end of the indicator light module is connected to the first end of the relay module, the second end of the indicator light module is connected to the second end of the relay module and the first end of the circuit control module, the third end of the relay module is connected to the first end of the load module, and the second end of the load module is connected to the second end of the circuit control module.

2. The self-locking protection control circuit according to claim 1, characterized in that, The indicator light working module includes a switch S1, a resistor R1, a diode D1, a resistor R2, an indicator light LED1, a resistor R5, a diode D4, one end of the switch S1 is connected to the live wire L, the other end of the switch S1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the positive terminal of the diode D1, the negative terminal of the diode D1 is connected to the first terminal of the relay working module and one end of the resistor R2, the other end of the resistor R2 is connected to the first terminal of the indicator light LED1, the second terminal of the indicator light LED1 is connected to the neutral wire N through the resistor R5, the third terminal of the indicator light LED1 is connected to the positive terminal of the diode D4, and the negative terminal of the diode D4 is connected to the second terminal of the relay working module and the first terminal of the circuit control module.

3. The control circuit with self-locking protection according to claim 2, characterized in that, The relay working module includes diode D2, relay RY1, and capacitor C2. The negative terminal of diode D2 is connected to the first terminal of relay RY1, the negative terminal of diode D1, and one terminal of capacitor C2. The second terminal of relay RY1 is connected to the negative terminal of diode D4 and the positive terminal of diode D2. The other terminal of capacitor C2 is grounded. The third terminal of relay RY1 is connected to the first terminal of the load working module, and the fourth terminal of relay RY1 is connected to the other terminal of switch S1.

4. The control circuit with self-locking protection according to claim 1, characterized in that, The load working module includes a rectifier DB1, an inductor L1, an inductor L2, a capacitor C1, and a load M1. The first terminal of the rectifier DB1 is connected to the third terminal of the relay working module, the second terminal of the rectifier DB1 is connected to the second terminal of the circuit control module, the third terminal of the rectifier DB1 is connected to one end of the inductor L1, the fourth terminal of the rectifier DB1 is connected to one end of the inductor L2, the other end of the inductor L1 is connected to one end of the capacitor C1 and one end of the load M1, and the other end of the inductor L2 is connected to the other end of the capacitor C1 and the other end of the load M1.

5. The control circuit with self-locking protection according to claim 1, characterized in that, The circuit control module includes diode D3, potentiometer RW1, resistors R3, R4, and R6, capacitor C3, and unidirectional thyristor TR1. The positive terminal of diode D3 is connected to one end of resistor R3 and the second terminal of the load working module. The other end of resistor R3 is connected to the neutral line N. One end of capacitor C3 is connected to the negative terminal of unidirectional thyristor TR1 and one end of resistor R6. The negative terminal of diode D3 is connected to one end of potentiometer RW1. The other end of potentiometer RW1 is connected to one end of resistor R4. The other end of resistor R4 is connected to the other end of resistor R6, the other end of capacitor C3, and the control terminal of unidirectional thyristor TR1. The positive terminal of unidirectional thyristor TR1 is connected to the second terminal of the indicator light working module and the second terminal of the relay working module.

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