CN215897591U

CN215897591U - Power switch circuit

Info

Publication number: CN215897591U
Application number: CN202122107090.2U
Authority: CN
Inventors: 王能达; 吴广华; 谈超华; 王俊
Original assignee: Guangzhou Shangwei Electronics Co ltd
Current assignee: Guangzhou Shangwei Electronics Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-02-22
Anticipated expiration: 2031-09-02

Abstract

The utility model discloses a power supply switch circuit which comprises a switch power supply U1, a rectifying circuit, a high-temperature on-off control circuit, a controllable conductive switch circuit and a voltage stabilizing circuit, wherein the output end of the switch power supply U1 is electrically connected with the rectifying circuit, the high-temperature on-off control circuit is electrically connected between the switch power supply U1 and the rectifying circuit, the output end of the rectifying circuit is electrically connected with the controllable conductive switch circuit, and the output end of the controllable conductive switch circuit is electrically connected with the voltage stabilizing circuit. The rectifier circuit that this power switching circuit set up is used for control current to switch on to the restriction current, controllable conductive switch circuit can play the switching action in the circuit, and high temperature on-off control circuit can rise along with the temperature, increases circuit resistance for change the electric energy into heat release, protection circuit, and cooperation voltage stabilizing circuit are used for keeping the stability of circuit output.

Description

Power switch circuit

Technical Field

The utility model relates to the technical field of power switch circuits, in particular to a power switch circuit.

Background

With the high-speed development of power electronic technology, the power electronic equipment has increasingly close relationship with the work and life of people, electronic equipment can not be switched off from a reliable power supply, the power supply of computers in the 80 s is comprehensively changed into a switching power supply, the power supply of computers is firstly replaced, the switching power supply enters the fields of various electronic and electrical equipment in the 90 s, the switching power supply is widely used in a program-controlled exchanger, a communication, an electronic detection equipment power supply, a control equipment power supply and the like, and the rapid development of the switching power supply technology is promoted.

The existing power switch circuit is easily influenced by the running state of the power switch circuit, so that the output voltage or current is unstable, the on-off of the circuit is not convenient to control, the use requirements of people cannot be well met, and technical innovation is performed on the basis of the existing power switch circuit according to the situation.

SUMMERY OF THE UTILITY MODEL

The present invention provides a power switch circuit, so as to solve the problems that the existing power switch circuit is easily affected by its own operation state during the use process, resulting in unstable output voltage or current and inconvenient control of the on/off of the circuit.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a power switch circuit, includes switching power supply U1, rectifier circuit, high temperature on-off control circuit, controllable conductive switch circuit and voltage stabilizing circuit, switching power supply U1's output electricity is connected with rectifier circuit, the electricity is connected between switching power supply U1 and the rectifier circuit has high temperature on-off control circuit, rectifier circuit's output electricity is connected with controllable conductive switch circuit, controllable conductive switch circuit's output electricity is connected with voltage stabilizing circuit.

Preferably, the rectifying circuit comprises a resistor R1, a capacitor C1, a diode D1 and a resistor R2, a lead led out from a power supply voltage pin VCC of the switching power supply U1 is electrically connected with the resistor R1 and the diode D1, a lead led out from the resistor R1 is electrically connected with the capacitor C1, a lead led out from the capacitor C1 is grounded, and the diode D1 is electrically connected in parallel with the resistor R2.

Preferably, the resistor R1 is connected in series with the capacitor C1 through a lead, and the resistor R1 and the capacitor C1 are connected in parallel to the switching power supply U1.

Preferably, the high-temperature on-off control circuit comprises a PTC thermistor and a capacitor C2, a lead led out from a grounding pin GND of the switching power supply U1 is electrically connected with the PTC thermistor, and the PTC thermistor is electrically connected with the capacitor C2 in parallel.

Preferably, the controllable conductive switch circuit comprises a resistor R3, a resistor R4, a diode D2, a diode D3 and a capacitor C2, a lead wire led out from a diode D1 of the rectification circuit is electrically connected with a resistor R3, a lead wire led out from a resistor R3 is electrically connected with a diode D2, a lead wire led out from a diode D2 is electrically connected with a switch diode D3, a switch diode D3 is electrically connected with the resistor R4, and a capacitor C2 is electrically connected between the switch diode D3 and the resistor R4.

Preferably, the resistor R3, the diode D2 and the switching diode D3 are electrically connected in series, and the resistor R4 and the capacitor C2 are electrically connected in parallel.

Preferably, the voltage stabilizing circuit comprises a capacitor C3, a zener diode ZD1, a resistor R5, a resistor R6 and a resistor R7, a lead led out from a diode D1 of the rectifying circuit is electrically connected with a zener diode ZD1, leads led out from two ends of the zener diode ZD1 are electrically connected with the capacitor C3 and the resistor R7 respectively, and a resistor R5 and a resistor R6 are electrically connected between the capacitor C3 and the resistor R7.

Preferably, the resistor R5 and the resistor R6 are connected in series, the zener diode ZD1 is connected in parallel with the resistor R5 and the resistor R6, and the capacitor C3 is connected in parallel with the resistor R7.

Compared with the prior art, the utility model has the following beneficial effects:

the rectifier circuit is used for controlling current conduction and limiting current, the controllable conductive switch circuit can play a switching role in the circuit, the high-temperature on-off control circuit can increase the circuit resistance along with temperature rise, is used for converting electric energy into heat to release, protects the circuit, and is matched with the voltage stabilizing circuit to maintain the stability of circuit output;

the utility model is provided with a rectifying circuit, a diode D1 utilizes the unidirectional conductivity of the diode, and can convert alternating current with alternately changed directions into pulse direct current with a single direction, thereby realizing the stable power supply of a switching power supply U1 for the circuit operation, and a diode D1 is matched with a resistor R2 for separating the circuit current and keeping the stable operation of the circuit;

the high-temperature on-off control circuit is arranged, the temperature is increased after the current passes through the PTC thermistor, the resistance is increased, the current is limited to be increased, the current is reduced, the temperature of an element is reduced, the resistance value is reduced, the current of the circuit is increased, the temperature can be kept in a specific range, and the function of switching is achieved, wherein the capacitor C2 is used for dividing the voltage and protecting the PTC thermistor;

the utility model is provided with a controllable conductive switch circuit, which is used for limiting current through the matching of a resistor R3 and a diode D2, protecting a circuit accessed by a diode D2, and being accessed by a switch diode D3, and can play a role of switching under a cut-off state to disconnect the circuit;

the voltage stabilizing circuit is provided with a voltage stabilizing circuit, the voltage stabilizing diode ZD1 is used for keeping the voltage at two ends of the voltage stabilizing diode ZD1 unchanged after breakdown, and the voltage stabilizing circuit is matched with the resistor R5 and the resistor R6 for shunting and providing protection for the voltage stabilizing diode ZD 1.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

As shown in fig. 1, the present embodiment provides a power switch circuit, which includes a switching power supply U1, a rectifying circuit, a high-temperature on-off control circuit, a controllable conducting switch circuit, and a voltage stabilizing circuit, where an output terminal of the switching power supply U1 is electrically connected to the rectifying circuit, the rectifying circuit includes a resistor R1, a capacitor C1, a diode D1, and a resistor R2, a lead from a supply voltage pin VCC of the switching power supply U1 is electrically connected to a resistor R1 and a diode D1, a lead from the resistor R1 is electrically connected to a capacitor C1, a lead from the capacitor C1 is grounded, the diode D1 is electrically connected in parallel to a resistor R2, the resistor R1 is connected in series with a capacitor C1 through a lead, the resistor R1 and the capacitor C1 are connected in parallel to the switching power supply U1, and a diode D1 uses unidirectional conductivity of the diode to convert alternating current whose direction is changed into direct current pulses in a single direction, the switch power supply U1 is used for supplying power for the circuit stably, the diode D1 is matched with the resistor R2 to separate the circuit current and keep the circuit stably running, a high-temperature on-off control circuit is electrically connected between the switch power supply U1 and the rectifying circuit, the high-temperature on-off control circuit comprises a PTC thermistor and a capacitor C2, a lead led out from a grounding pin GND of the switch power supply U1 is electrically connected with the PTC thermistor, the PTC thermistor is electrically connected with the capacitor C2 in parallel, the temperature of the current is increased after passing through the PTC thermistor, the resistance is increased, the current is limited to be increased, the current is reduced, the temperature of an element is reduced, the circuit current is increased, the temperature can be kept in a specific range and can play a role of switching, the capacitor C2 is used for dividing the voltage and protecting the PTC thermistor, the output end of the rectifying circuit is electrically connected with a controllable conductive switch circuit, the controllable conductive switch circuit comprises a resistor R3, a resistor R4, a diode D2, a diode D3 and a capacitor C2, a lead led out from a diode D1 of the rectifying circuit is electrically connected with a resistor R3, a lead led out from a resistor R3 is electrically connected with a diode D2, a lead led out from a diode D2 is electrically connected with a switch diode D3, a switch diode D3 is electrically connected with the resistor R4, a capacitor C2 is electrically connected between the switch diode D3 and the resistor R4, the resistor R3, the diode D2 and the switch diode D3 are electrically connected in series, a resistor R4 and a capacitor C2 are electrically connected in parallel, the circuit connected by the cooperation of the resistor R3 and the diode D2 is used for current limiting, the circuit connected by the diode D2 is protected, the circuit connected by the switch diode D3 is connected in a matching mode, the circuit can be used for switching off under the switching state, and the output end of the controllable conductive switch circuit is electrically connected with a voltage stabilizing circuit, the rectifier circuit is used for controlling current conduction and limiting current, the controllable conductive switch circuit can play a switching role in the circuit, the high-temperature on-off control circuit can increase circuit resistance along with temperature rise, and the high-temperature on-off control circuit is used for converting electric energy into heat to be released, protecting the circuit and matching with the voltage stabilizing circuit to keep the stability of circuit output.

Example two

The scheme in the first embodiment is further described in the following with reference to specific working modes, which are described in detail in the following:

as shown in fig. 1, as a preferred embodiment, in addition to the above manner, the voltage stabilizing circuit further includes a capacitor C3, a zener diode ZD1, a resistor R5, a resistor R6, and a resistor R7, the conducting wire led out from the diode D1 of the rectifying circuit is electrically connected to a zener diode ZD1, the conducting wire led out from both ends of the zener diode ZD1 is electrically connected to a capacitor C3 and a resistor R7, respectively, the resistor R5 and a resistor R6 are electrically connected between the capacitor C3 and the resistor R7, the resistor R5 and the resistor R6 are connected in series, the zener diode ZD1 is connected in parallel to the resistor R5 and the resistor R6, the capacitor C3 is connected in parallel to the resistor R7, the zener diode ZD1 is used for maintaining the voltage across the zener diode 1 unchanged after breakdown, and the resistor R5 and the resistor R6 are used for shunting and providing protection for the zener diode ZD 1.

The working principle of the power switch circuit is as follows: firstly, diode D1 utilizes diode single-direction conductivity to convert alternating current with alternating direction into pulse direct current with single direction, so as to realize that switching power supply U1 supplies power stably for circuit operation, diode D1 cooperates with resistor R2 to separate circuit current and maintain stable operation of the circuit, then the current passes through PTC thermistor to cause temperature rise, resistance increase, thereby limiting current increase, current decrease, element temperature decrease, resistance decrease and circuit current increase, temperature can be kept in a specific range, and the function of switching is achieved, and the function of limiting current through cooperation of resistor R3 and diode D2, and protecting the circuit accessed by diode D2, and cooperates with switching diode D3 to access the circuit, and the function of switching is achieved in the cut-off state, and the circuit is disconnected; then, the zener diode ZD1 is used to keep the voltage across the zener diode ZD1 unchanged after breakdown, and the resistor R5 and the resistor R6 are used to shunt current and provide protection for the zener diode ZD 1.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a power switching circuit, includes switching power supply U1, rectifier circuit, high temperature on-off control circuit, controllable conductive switch circuit and voltage stabilizing circuit, its characterized in that: the output end of the switch power supply U1 is electrically connected with a rectifying circuit, a high-temperature on-off control circuit is electrically connected between the switch power supply U1 and the rectifying circuit, the output end of the rectifying circuit is electrically connected with a controllable conductive switch circuit, and the output end of the controllable conductive switch circuit is electrically connected with a voltage stabilizing circuit.

2. A power switching circuit as claimed in claim 1, wherein: the rectifying circuit comprises a resistor R1, a capacitor C1, a diode D1 and a resistor R2, a lead led out from a power supply voltage pin VCC of the switch power supply U1 is electrically connected with a resistor R1 and a diode D1, a lead led out from the resistor R1 is electrically connected with the capacitor C1, a lead led out from the capacitor C1 is grounded, and the diode D1 is electrically connected with the resistor R2 in parallel.

3. A power switching circuit as claimed in claim 2, wherein: the resistor R1 is connected with the capacitor C1 in series through a lead, and the resistor R1 and the capacitor C1 are connected into the switching power supply U1 in parallel.

4. A power switching circuit as claimed in claim 1, wherein: the high-temperature on-off control circuit comprises a PTC thermistor and a capacitor C2, a lead led out from a grounding pin GND of the switching power supply U1 is electrically connected with the PTC thermistor, and the PTC thermistor is electrically connected with the capacitor C2 in parallel.

5. A power switching circuit as claimed in claim 1, wherein: the controllable conductive switch circuit comprises a resistor R3, a resistor R4, a diode D2, a diode D3 and a capacitor C2, a lead led out from a diode D1 of the rectifying circuit is electrically connected with a resistor R3, a lead led out from the resistor R3 is electrically connected with the diode D2, a lead led out from a diode D2 is electrically connected with a switch diode D3, a switch diode D3 is electrically connected with the resistor R4, and the capacitor C2 is electrically connected between the switch diode D3 and the resistor R4.

6. A power switching circuit according to claim 5, wherein: the resistor R3, the diode D2 and the switch diode D3 are electrically connected in series, and the resistor R4 and the capacitor C2 are electrically connected in parallel.

7. A power switching circuit as claimed in claim 1, wherein: the voltage stabilizing circuit comprises a capacitor C3, a voltage stabilizing diode ZD1, a resistor R5, a resistor R6 and a resistor R7, a lead led out from a diode D1 of the rectifying circuit is also electrically connected with a voltage stabilizing diode ZD1, leads led out from two ends of the voltage stabilizing diode ZD1 are respectively electrically connected with the capacitor C3 and the resistor R7, and a resistor R5 and a resistor R6 are electrically connected between the capacitor C3 and the resistor R7.

8. A power switching circuit according to claim 7, wherein: the resistor R5 and the resistor R6 are connected in series, the zener diode ZD1 is connected in parallel with the resistor R5 and the resistor R6, and the capacitor C3 is connected in parallel with the resistor R7.