A false start prevention switch delay controller for a power supply

Abstract

The utility model belongs to power control technical field, and disclose a kind of for power anti-misoperation switch delay controller, including buck circuit, switching circuit, delay circuit and drive circuit.Adopt the utility model technical scheme, through pure hardware circuit integration buck, switch, delay and drive function, the delay control of power anti-misoperation switch is realized;The utility model constructs full hardware circuit using discrete component, without MCU or special chip, cost and circuit complexity are significantly reduced;Buck circuit realizes stable voltage output by resistance, stabilivolt and triode combination, avoids the dependence on specific external power supply;Switching circuit uses self-locking mechanism to ensure reliable conduction of short press trigger, delay circuit controls off delay accurately by RC charging time, effectively prevents misoperation;Drive circuit directly controls DC / DC converter, response is fast and stability is high.Overall structure is compact, easy to implement, applicable to industrial power supply, household appliances and a variety of scenes.

Description

Technical Field

[0001] This utility model belongs to the field of power control technology, specifically relating to a delay controller for preventing accidental switching of power supplies. Background Technology

[0002] With the widespread application of electronic devices in industrial control, home appliances and communication systems, the reliability and safety of power management systems are receiving increasing attention. Among them, power switching control, especially preventing accidental power-on or power-off due to accidental touch, has become one of the key technical requirements.

[0003] Power supply delay control to prevent accidental power-on / off typically employs integrated chips or software delay solutions. Integrated chips require a fixed external power supply, while software solutions require an MCU and peripheral circuits, resulting in high costs and complex circuits. Existing technologies suffer from high costs, complex circuits, reliance on software, and specific power supply requirements, which limit their application in low-cost, high-reliability scenarios. Utility Model Content

[0004] In view of the problems mentioned above in the background technology, the purpose of this utility model is to provide a delay controller for preventing accidental switching of power supplies.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by this utility model is as follows:

[0006] A power supply anti-misoperation switch delay controller includes a buck circuit, a switching circuit, a delay circuit, and a drive circuit. The buck circuit includes resistors R1 and R2, transistor Q2, Zener diode ZD1, and capacitors C2 and C3. After the input voltage is current-limited by R1 and R2 and regulated by ZD1, a stable output voltage is clamped by the BE junction of Q2. The switching circuit includes resistors R3, R5, R6, and R8, and transistors Q1 and Q3, which form a self-locking path triggered by switch S1. The delay circuit includes transistor Q5, resistors R7, R9, and R10, capacitors C4 and C1, and diodes D1, D2, and D3, which control the turn-off delay of the switching circuit through RC charging time. The drive circuit includes resistors R4 and R11, and transistor Q4, which is used to drive the switching operation of the DC / DC converter.

[0007] Preferably, in the step-down circuit, the BE junction voltage of Q2 is 0.7V lower than the regulated voltage of ZD1, and C2 and C3 are filter capacitors.

[0008] Preferably, in the switching circuit, S1 is a switch without self-locking. When S1 is pressed, C1 is charged through R3, which turns on Q1 and triggers Q3 to turn on, thus forming a self-locking circuit.

[0009] Preferably, in the delay circuit, the values ​​of R7 and C4 determine the delay time, and the delay length is estimated by the RC time constant.

[0010] Preferably, in the driving circuit, after Q1 is turned on, Q4 is driven by voltage divider through R4 and R11 to control the operation of the DC / DC converter.

[0011] Preferably, the selection of the transistor Q2 is determined based on the input voltage and power consumption requirements.

[0012] Preferably, when the voltage of capacitor C4 in the delay circuit reaches the conduction point of Q5, Q3 is turned off, and the self-locking is released.

[0013] Preferably, after S1 is turned off, the switching circuit automatically turns off Q1 and Q3 through a delay circuit to achieve delay control.

[0014] This invention integrates buck, switching, delay, and drive functions into a pure hardware circuit, achieving delay control for power supply anti-misoperation switching. The invention uses discrete components to construct the entire hardware circuit, eliminating the need for an MCU or dedicated chip, significantly reducing cost and circuit complexity. The buck circuit achieves stable voltage output through a combination of resistors, Zener diodes, and transistors, avoiding dependence on a specific external power supply. The switching circuit utilizes a self-locking mechanism to ensure reliable conduction after a short press, and the delay circuit precisely controls the turn-off delay through RC charging time, effectively preventing misoperation. The drive circuit directly controls the DC / DC converter, offering fast response and high stability. The overall structure is compact and easy to implement, suitable for various scenarios such as industrial power supplies and household appliances. While ensuring functional reliability, it significantly saves on materials and development costs, demonstrating high practicality. Attached Figure Description

[0015] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings;

[0016] Figure 1 This is a schematic diagram of the circuit structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the step-down circuit structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the switching circuit structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the delay circuit structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the driving circuit structure of this utility model;

[0021] Figure 6 This is a schematic diagram of the DC / DC converter structure of this utility model.

[0022] The symbols for the main components are explained below:

[0023] 1. Step-down circuit; 2. Switching circuit; 3. Delay circuit; 4. Drive circuit; 5. DC / DC converter. Detailed Implementation

[0024] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Example 1:

[0026] Please see Figure 1 This utility model provides a technical solution: a power supply anti-misoperation switch delay controller, including a step-down circuit 1, a switch circuit 2, a delay circuit 3, and a drive circuit 4. The output terminal of the step-down circuit 1 is electrically connected to the input terminal of the switch circuit 2, the output terminal of the switch circuit 2 is electrically connected to the input terminal of the delay circuit 3, the output terminal of the delay circuit 3 is electrically connected to the input terminal of the drive circuit 4, and the output terminal of the drive circuit 4 is electrically connected to the input terminal of the DC / DC converter 5.

[0027] In this invention, the working steps of the device are as follows: First, the input voltage is current-limited and voltage-regulated by the step-down circuit 1, and the output stable voltage supplies power to the entire system; then, by pressing switch S1, the switching circuit 2 is triggered, making Q1 and Q3 conduct to form a self-locking path; next, the delay circuit 3 starts to work, and the delay is controlled by the RC charging time. When the voltage of capacitor C4 is charged to the conduction point of Q5, Q3 is turned off to release the self-locking; finally, the drive circuit 4 drives Q4 when Q1 is on, controlling the DC / DC converter 5 to work, realizing the delay switch control of the power supply.

[0028] Example 2:

[0029] Please see Figure 2 The step-down circuit 1 includes resistors R1 and R2, transistor Q2, Zener diode ZD1, and capacitors C2 and C3. After the input voltage is current-limited by R1 and R2 and regulated by ZD1, the output voltage is clamped by the BE junction of Q2.

[0030] In this invention, the working steps of the device are as follows: the input voltage is current-limited by R1 and R2, ZD1 is used for voltage regulation, the BE junction of Q2 further clamps the voltage so that the output voltage is 0.7V lower than the ZD1 regulated voltage, and capacitors C2 and C3 are used for filtering to provide a clean and stable voltage, ensuring that the subsequent circuits work normally.

[0031] Example 3:

[0032] Please see Figure 3 andFigure 4 The switching circuit 2 includes resistors R3, R5, R6, R8 and transistors Q1 and Q3, and the delay circuit 3 includes transistor Q5, resistors R7, R9, R10, capacitors C4 and C1 and diodes D1, D2 and D3.

[0033] In this invention, the working steps of the device are as follows: Pressing switch S1 charges capacitor C1 through R3, causing Q1 to conduct. After Q1 conducts, Q3 is triggered to conduct, forming a self-locking path. At the same time, the delay circuit 3 starts to work, and the power supply charges capacitor C4 through R7. When the voltage of C4 is charged to the conduction point of Q5, Q5 conducts, turning off Q3, thereby releasing the self-locking and automatically turning off the switch circuit 2, realizing delay control. The delay time is determined by the RC time constant of R7 and C4.

[0034] Example 4:

[0035] Please see Figure 5 and Figure 6 The driving circuit 4 includes resistors R4 and R11 and transistor Q4, which are used to drive the DC / DC converter 5.

[0036] In this invention, the working steps of the device are as follows: When Q1 in the switching circuit 2 is turned on, Q4 is driven to turn on through the voltage divider of R4 and R11. Q4 controls the switching operation of the DC / DC converter 5, so that the DC / DC converter 5 starts to work; when the delay circuit 3 turns off the switching circuit 2, Q1 is turned off, Q4 is turned off accordingly, the DC / DC converter 5 stops working, and the power supply is turned off in a delayed manner.

[0037] All electrical components mentioned in this article are connected to an external main controller and 220V AC mains power, and the main controller can be a conventional known device such as a computer that can be used for control.

[0038] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A power supply anti-misoperation switching delay controller, comprising a step-down circuit (1), a switching circuit (2), a delay circuit (3), and a drive circuit (4), characterized in that: The step-down circuit (1) includes resistors R1 and R2, transistor Q2, Zener diode ZD1, and capacitors C2 and C3. After the input voltage is current-limited by R1 and R2 and regulated by ZD1, a stable output voltage is clamped by the BE junction of Q2. The switching circuit (2) includes resistors R3, R5, R6, R8, and transistors Q1 and Q3. A self-locking path is formed by triggering switch S1. The delay circuit (3) includes transistor Q5, resistors R7, R9, R10, capacitors C4 and C1, and diodes D1, D2, and D3. The turn-off delay of the switching circuit (2) is controlled by the RC charging time. The driving circuit (4) includes resistors R4 and R11 and transistor Q4. It is used to drive the switching operation of the DC / DC converter (5).

2. The anti-misoperation switching delay controller for power supplies according to claim 1, characterized in that: In the step-down circuit (1), the BE junction voltage of Q2 is 0.7V lower than the regulated voltage of ZD1, and C2 and C3 are filter capacitors.

3. A power supply anti-misoperation switch delay controller according to claim 1, characterized in that: In the switch circuit (2), S1 is a switch without self-locking. When S1 is pressed, C1 is charged through R3, which turns on Q1 and triggers Q3 to turn on, thus forming a self-locking circuit.

4. A power supply anti-misoperation switch delay controller according to claim 1, characterized in that: In the delay circuit (3), the values ​​of R7 and C4 determine the delay time, and the delay length is estimated by the RC time constant.

5. A power supply anti-misoperation switch delay controller according to claim 1, characterized in that: In the driving circuit (4), after Q1 is turned on, it drives Q4 through voltage division by R4 and R11, thereby controlling the DC / DC converter (5) to work.

6. A power supply anti-misoperation switch delay controller according to claim 1, characterized in that: The selection of transistor Q2 is determined based on the input voltage and power consumption requirements.

7. A power supply anti-misoperation switch delay controller according to claim 1, characterized in that: When the voltage of capacitor C4 in the delay circuit (3) is charged to the conduction point of Q5, Q3 is turned off and the self-locking is released.

8. A power supply anti-misoperation switch delay controller according to claim 1, characterized in that: After S1 is disconnected, the switching circuit (2) automatically turns off Q1 and Q3 through the delay circuit (3) to achieve delay control.

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