Safety protection module for dual-power supply system

Abstract

The utility model relates to the technical field of power supply systems, in particular to a safety protection module for a dual-power supply system, which comprises a low-voltage direct-current power supply module, a pulse square wave output circuit, a direct-current switch circuit, an alternating-current switch circuit, a direct-current trigger protection circuit and an alternating-current trigger protection circuit. The pulse square wave output circuit is connected to the direct current switch circuit; the direct current trigger protection circuit is used for triggering the pulse square wave output circuit to be started or closed, and the alternating current trigger protection circuit is connected with the alternating current switch circuit and used for triggering the alternating current switch circuit to be connected or disconnected. The beneficial effects are that pulse square wave direct current with a certain frequency and duty ratio is output on a ground zero line, power supply of a low-voltage direct current power supply is provided for a power supply system, and reverse voltage on the ground zero line is detected by using a time period of zero potential in the pulse square wave direct current; fault signals can be transmitted in a mode of outputting reverse voltage on a ground null line, and effective protection of a power supply system is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply systems, and in particular to a safety protection module for a dual power supply system. Background Art

[0002] In the process of electricity use, there are many kinds of circuit faults caused by various reasons, such as overload, overcurrent, over-voltage, undervoltage, leakage, etc. If these circuit faults are not discovered and handled in time, it is easy to further lead to various dangers, such as electric shock, fire, etc. Therefore, in order to detect the faults in the power supply system in time, it is necessary to set up relevant protection circuits to detect the faults and handle them in time. The current protection circuit has a relatively single function. If you want to achieve safety protection of multiple functions, you need to install a lot of additional safety protectors, which takes up too much distribution space and it is difficult to achieve comprehensive safety protection. Utility Model Content

[0003] The utility model aims to provide a safety protection module for a dual power supply system, specifically to provide a module which provides low-voltage direct current on a ground neutral line and uses the low-voltage direct current to achieve safety protection of the power supply system.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a safety protection module for a dual power supply system, comprising a low-voltage DC power supply module, a pulse square wave output circuit, a DC switching circuit, an AC switching circuit, a DC trigger protection circuit and an AC trigger protection circuit; the low-voltage DC power supply module is connected to the ground neutral line through the DC switching circuit, and the AC switching circuit is connected to the live neutral line; the output end of the pulse square wave output circuit is connected to the DC switching circuit, and the pulse square wave output circuit triggers the DC switching circuit to turn on when the pulse square wave output circuit outputs a high level; the DC trigger protection circuit is connected to the pulse square wave output circuit to trigger the pulse square wave output circuit to start or shut down, and the AC trigger protection circuit is connected to the AC switching circuit to trigger the AC switching circuit to turn on or off.

[0005] Specifically, the pulse square wave output circuit includes a precise voltage stabilization circuit, an oscillation circuit and a push-pull output circuit. The precise voltage stabilization circuit supplies power to the oscillation circuit and the push-pull output circuit. The output end of the oscillation circuit is connected to the input end of the push-pull output circuit. The output end of the oscillation circuit is also connected to a DC trigger protection circuit.

[0006] Specifically, the DC trigger protection circuit includes one or more of an over-temperature trigger circuit, a DC manual switch circuit, and an under-voltage trigger circuit.

[0007] Specifically, the AC trigger protection circuit includes one or more of a fault trigger circuit, a leakage trigger circuit, an AC manual switch circuit, an over-voltage or under-voltage trigger circuit, and an overload trigger circuit.

[0008] Specifically, the direct current switch circuit adopts a field effect transistor switch circuit.

[0009] Specifically, the AC switching circuit adopts a relay switching circuit.

[0010] Specifically, the fault alarm trigger circuit includes a reverse voltage output circuit and a reverse voltage detection trigger circuit. The reverse voltage output circuit can output a reverse voltage to the ground neutral line after detecting a fault, and the reverse voltage detection trigger circuit can detect the reverse voltage appearing on the ground neutral line and trigger the AC switch circuit to disconnect.

[0011] The beneficial effects of the utility model are as follows: by outputting pulsed square wave direct current with a certain frequency and duty cycle on the ground neutral line, a low-voltage direct current power supply is provided to the power supply system, and at the same time, the reverse voltage on the ground neutral line is detected by utilizing the zero potential time period in the pulsed square wave direct current. When a fault occurs, the fault signal can be transmitted by outputting a reverse voltage on the ground neutral line, thereby achieving effective protection of the power supply system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Attached Figure 1 This is a schematic diagram of the connection between the safety protection module and the power supply system in the embodiment;

[0013] Attached Figure 2 4 is a circuit connection diagram of the pulse square wave output circuit in the embodiment. DETAILED DESCRIPTION

[0014] Example 1, reference Figure 1-2 , a safety protection module for a dual power supply system, comprising a low-voltage DC power supply module, a pulse square wave output circuit, a DC switching circuit, an AC switching circuit, a DC trigger protection circuit and an AC trigger protection circuit; the low-voltage DC power supply module is connected to the ground neutral line through the DC switching circuit, and the AC switching circuit is connected to the live neutral line; the output end of the pulse square wave output circuit is connected to the DC switching circuit, and the DC switching circuit is triggered to turn on when the pulse square wave output circuit outputs a high level; the DC trigger protection circuit is connected to the pulse square wave output circuit to trigger the pulse square wave output circuit to start or shut down, and the AC trigger protection circuit is connected to the AC switching circuit to trigger the AC switching circuit to turn on or off.

[0015] In this embodiment, the low-voltage DC power supply module uses an AC-to-DC circuit to convert the AC power of the mains into low-voltage DC power and outputs it to the ground neutral line through a DC switch circuit. Specifically, the output ground line is the positive output of the low-voltage DC power, and the output neutral line is the negative output of the low-voltage DC power. The pulse square wave output circuit is used to output a pulse square wave signal of a certain frequency to the DC switch circuit, triggering the DC switch circuit to turn on. When the pulse square wave output circuit outputs a high level, the DC switch circuit is turned on. When the pulse square wave output circuit outputs a low level, the DC switch circuit is turned off. Therefore, when the pulse square wave output circuit works normally, the ground neutral line outputs a pulse square wave DC power with the same frequency as the pulse square wave output circuit. On the basis of conventional AC power of the mains, the power supply of low-voltage DC power is increased. In addition, the DC trigger protection circuit can detect faults in the DC power and trigger the pulse square wave output circuit to start or shut down, or trigger the pulse square wave output circuit to start or shut down according to the state of the trigger switch. By triggering the pulse square wave output circuit to shut down, the DC switch circuit can be turned off to shut down the output of DC power on the ground neutral line. The AC trigger protection circuit can detect the fault of AC power and control the output of AC power by triggering the conduction or disconnection of the AC switch circuit. The DC switch circuit can use a transistor switch circuit, preferably a field effect transistor switch circuit. When the input end is at a high level, the transistor or field effect transistor can be triggered to conduct to realize the conduction of the DC switch circuit; the AC switch circuit uses a relay switch circuit, which controls the conduction or disconnection of the relay by controlling the power supply of the relay coil to be turned on or off.

[0016] Specifically, the pulse square wave output circuit includes a precise voltage stabilizing circuit, an oscillating circuit and a push-pull output circuit. The precise voltage stabilizing circuit supplies power to the oscillating circuit and the push-pull output circuit. The output end of the oscillating circuit is connected to the input end of the push-pull output circuit. The output end of the oscillating circuit is connected to the input end of the push-pull output circuit to control the output of the push-pull output circuit. When the oscillating circuit outputs a high level, the push-pull output circuit also outputs a high level. In addition, the output end of the oscillating circuit is connected to the DC triggering protection circuit. The DC triggering protection circuit controls the level of the output end of the oscillating circuit by detecting a fault of the DC power or the state of the manual triggering switch. Specifically, the output end of the oscillating circuit is connected to the ground point to lower its level, so that the push-pull output circuit outputs a low level and controls the DC switch circuit to disconnect.

[0017] Specifically, the above-mentioned DC trigger protection circuit includes one or more of an over-temperature trigger circuit, a DC manual switch circuit, and an under-voltage trigger circuit. Among them, the DC trigger protection circuit can control the conduction of the transistor and connect its collector end to the output end of the oscillation circuit. When the transistor is turned on, the level of the output end of the oscillation circuit can be pulled down, which has the effect of turning off the low-voltage DC power supply. Specifically, the over-temperature trigger circuit sets a thermistor, and when the operating temperature is too high, it will trigger the pulse square wave output circuit to shut down, the DC manual switch circuit triggers the start or shut down of the pulse square wave output circuit by switch triggering, and the under-voltage trigger circuit triggers the start or shut down of the pulse square wave output circuit by detecting the voltage of the power supply output by the low-voltage DC power supply module.

[0018] Specifically, the AC trigger protection circuit includes one or more of a fault trigger circuit, a leakage trigger circuit, an AC manual switch circuit, an overvoltage and undervoltage trigger circuit, and an overload trigger circuit. Among them, the above-mentioned fault alarm trigger circuit includes a reverse voltage output circuit and a reverse voltage detection trigger circuit. After detecting a fault, the reverse voltage output circuit can output a reverse voltage to the ground neutral line, and the reverse voltage detection trigger circuit can detect the reverse voltage appearing on the ground neutral line and trigger the AC switch circuit to disconnect. The reverse voltage output circuit can be triggered to turn on by using a sensor such as a smoke sensor or a temperature sensor to send a reverse voltage to the ground neutral line, and the reverse voltage detection trigger circuit can be used to trigger the DC switch circuit to disconnect according to the reverse voltage on the ground neutral line to disconnect the AC power. The reverse voltage output circuit can use an inductor circuit, connect the inductor circuit to the sensor switch for fault detection and trigger the conduction of the reverse voltage output circuit, and the reverse voltage output circuit is connected to the ground neutral line. The reverse voltage detection trigger circuit can use an optocoupler trigger circuit. When a reverse voltage appears on the ground neutral line, the optocoupler trigger circuit can be triggered to turn on, thereby triggering the DC switch circuit to turn off.

[0019] Of course, the above are only preferred implementations of the present utility model, and are not intended to limit the scope of use of the present utility model. Therefore, any equivalent changes made to the principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A safety protection module for a dual power supply system, characterized in that: It includes a low-voltage DC power supply module, a pulse square wave output circuit, a DC switching circuit, an AC switching circuit, a DC trigger protection circuit and an AC trigger protection circuit; the low-voltage DC power supply module is connected to the ground neutral line through the DC switching circuit, and the AC switching circuit is connected to the live neutral line; the output end of the pulse square wave output circuit is connected to the DC switching circuit, and the DC switching circuit is triggered to turn on when the pulse square wave output circuit outputs a high level; the DC trigger protection circuit is connected to the pulse square wave output circuit to trigger the pulse square wave output circuit to start or shut down, and the AC trigger protection circuit is connected to the AC switching circuit to trigger the AC switching circuit to turn on or off.

2. A safety protection module for a dual power supply system according to claim 1, characterized in that: The pulse square wave output circuit includes a precise voltage stabilization circuit, an oscillation circuit and a push-pull output circuit. The precise voltage stabilization circuit supplies power to the oscillation circuit and the push-pull output circuit. The output end of the oscillation circuit is connected to the input end of the push-pull output circuit. The output end of the oscillation circuit is simultaneously connected to a DC trigger protection circuit.

3. The safety protection module for a dual power supply system according to claim 1, characterized in that: The DC trigger protection circuit includes one or more of an over-temperature trigger circuit, a DC manual switch circuit, and an under-voltage trigger circuit.

4. The safety protection module for a dual power supply system according to claim 1, characterized in that: The AC trigger protection circuit includes one or more of a fault trigger circuit, a leakage trigger circuit, an AC manual switch circuit, an over-voltage or under-voltage trigger circuit, and an overload trigger circuit.

5. The safety protection module for a dual power supply system according to claim 1, characterized in that: The direct current switch circuit adopts a field effect tube switch circuit.

6. The safety protection module for a dual power supply system according to claim 1, characterized in that: The AC switching circuit adopts a relay switching circuit.

7. The safety protection module for a dual power supply system according to claim 4, characterized in that: The fault trigger circuit includes a reverse voltage output circuit and a reverse voltage detection trigger circuit. The reverse voltage output circuit can output a reverse voltage to the ground neutral line after detecting a fault. The reverse voltage detection trigger circuit can detect the reverse voltage appearing on the ground neutral line and trigger the AC switch circuit to disconnect.

Images