CN205336141U

CN205336141U - Safety protection switch power supply circuit

Info

Publication number: CN205336141U
Application number: CN201620092420.1U
Authority: CN
Inventors: 陈旭
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-01-31
Filing date: 2016-01-31
Publication date: 2016-06-22
Anticipated expiration: 2026-01-31

Abstract

The utility model discloses a safety protection switch power supply circuit, including transformer W, rectifier bridge T, chip IC1 and relay K, relay K's contact K -1 and 220V alternating current are connected to transformer W's winding N1's one end, transformer W's winding N1's the other end connected load A and the other end of 220V alternating current, rectifier bridge T's port 1 and rectifier bridge T's port 3 are connected respectively to transformer W's winding N2's both ends, rectifier bridge T's port 2 connecting resistance R2, resistance R4, triode V3's projecting pole, electric capacity C1, chip IC1's pin 4 and chip IC1's pin 8. The utility model discloses safety protection switch power supply circuit simple structure, components and parts are few, utilize 555 timer chip to combine original papers such as triode, relay to realize the undulant protection to the commercial power, can make the protection action to overvoltage and overcurrent phenomenon, increase the electrical safety performance, thus have that the function is various, convenient to use and advantage with low costs.

Description

A kind of safety protection switch power circuit

Technical field

This utility model relates to a kind of power circuit, specifically a kind of safety protection switch power circuit。

Background technology

Switching Power Supply is to utilize modern power electronics technology, controls the time ratio that switching tube turns on and off, and maintains a kind of power supply of regulated output voltage, and traditional Switching Power Supply is generally made up of pulse width modulation control chip and MOSFET。Development and innovation along with Power Electronic Technique so that switch power technology is also innovated constantly。At present; Switching Power Supply is widely used almost all of electronic equipment with small-sized, light weight and high efficiency feature; it is that current electronics and information industry develops rapidly indispensable a kind of power mode; stability and operating frequency are requisite performance indications; the most structure of Switching Power Supply common in life is complicated, function singleness, it is impossible to effectively protection electric loading。

Utility model content

The purpose of this utility model is in that to provide a kind of safety protection switch power circuit, with the problem solving to propose in above-mentioned background technology。

For achieving the above object, this utility model provides following technical scheme:

A kind of safety protection switch power circuit, including transformator W, rectifier bridge T, chip IC 1 and relay K, one end of the winding N1 of described transformator W connects contact K-1 and the 220V alternating current of relay K, the other end of the winding N1 of transformator W connects the other end of load A and 220V alternating current, the two ends of the winding N2 of transformator W connect the port 1 of rectifier bridge T and the port 3 of rectifier bridge T respectively, and the port 2 of rectifier bridge T connects resistance R2, resistance R4, the emitter stage of audion V3, electric capacity C1, the pin 4 of chip IC 1 and the pin 8 of chip IC 1, the other end of electric capacity C1 connects electric capacity C2, electric capacity C3, the port 4 of rectifier bridge T, relay K, the negative electrode of diode D1, the emitter stage of audion V1, the pin 1 of resistance R6 and chip IC 1, the pin 3 of chip IC 1 connects resistance R1, the other end of resistance R1 connects the other end of relay K and the anode of diode D1, the pin 7 of chip IC 1 connects resistance R3, the other end of resistance R3 connects the other end of resistance R4 and the base stage of audion V3, and the other end of resistance R2 connects the other end of electric capacity C3, the anode of diode D2, the colelctor electrode of audion V2, the pin 2 of chip IC 1 and the pin 6 of chip IC 1, the colelctor electrode of the negative electrode connecting triode V1 of diode D2, the base stage of audion V1 connects the other end of the other end connection resistance R6 of resistance R5, resistance R5, resistance R7, the emitter stage of the fixing end of of potentiometer RP1 and audion V2, the base stage of audion V2 connects the anode of diode D3, the negative electrode of diode D3 connects the sliding end of potentiometer RP1, the colelctor electrode of audion V3 connects the other end of resistance R7 and another fixing end of potentiometer RP1, and the model of described chip IC 1 is NE555。

As preferred version of the present utility model: described diode D1 is light emitting diode。

Compared with prior art; the beneficial effects of the utility model are: this utility model safety protection switch circuit construction of electric power is simple, components and parts are few; 555 timer chips are utilized to realize the wave protection to civil power in conjunction with the original paper such as audion, relay; overvoltage and overcurrent phenomenon can be made protection act; increase Electrical Safety performance, therefore there is diverse in function, the advantage that easy to use and cost is low。

Accompanying drawing explanation

Fig. 1 is the circuit diagram of safety protection switch power circuit。

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is only a part of embodiment of this utility model, rather than whole embodiments。Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection。

Referring to Fig. 1, in this utility model embodiment, a kind of safety protection switch power circuit, including transformator W, rectifier bridge T, chip IC 1 and relay K, one end of the winding N1 of described transformator W connects contact K-1 and the 220V alternating current of relay K, the other end of the winding N1 of transformator W connects the other end of load A and 220V alternating current, the two ends of the winding N2 of transformator W connect the port 1 of rectifier bridge T and the port 3 of rectifier bridge T respectively, and the port 2 of rectifier bridge T connects resistance R2, resistance R4, the emitter stage of audion V3, electric capacity C1, the pin 4 of chip IC 1 and the pin 8 of chip IC 1, the other end of electric capacity C1 connects electric capacity C2, electric capacity C3, the port 4 of rectifier bridge T, relay K, the negative electrode of diode D1, the emitter stage of audion V1, the pin 1 of resistance R6 and chip IC 1, the pin 3 of chip IC 1 connects resistance R1, the other end of resistance R1 connects the other end of relay K and the anode of diode D1, the pin 7 of chip IC 1 connects resistance R3, the other end of resistance R3 connects the other end of resistance R4 and the base stage of audion V3, and the other end of resistance R2 connects the other end of electric capacity C3, the anode of diode D2, the colelctor electrode of audion V2, the pin 2 of chip IC 1 and the pin 6 of chip IC 1, the colelctor electrode of the negative electrode connecting triode V1 of diode D2, the base stage of audion V1 connects the other end of the other end connection resistance R6 of resistance R5, resistance R5, resistance R7, the emitter stage of the fixing end of of potentiometer RP1 and audion V2, the base stage of audion V2 connects the anode of diode D3, the negative electrode of diode D3 connects the sliding end of potentiometer RP1, the colelctor electrode of audion V3 connects the other end of resistance R7 and another fixing end of potentiometer RP1, and the model of described chip IC 1 is NE555。

Diode D1 is light emitting diode。

Operation principle of the present utility model is: when civil power normal operation, and 220V line voltage, transformator W, rectifier bridge T, audion V3, R7 and resistor R6 form loop, and load is powered by power supply。When overcurrent phenomenon occurs in civil power, the increase of load current makes the current potential on resistor R6 increase, and the current potential that resistor R6 increases is added to the base stage of audion V1 and V1 is turned on。Now, 6 feet of 555 time base circuits, 2 feet obtain a low level, the set at once of 555 time base circuits, 3 foot output high level, light emitting diode D1 lights, light emitting diode D2 also lights, relay K action, and contact K-1 disconnects, simultaneously, discharge tube cut-off in 555 time base circuits, namely 7 feet are unsettled, and audion V3 ends。After power supply and load disconnect, capacitor C3 is charged by power supply by resistor R2, when the voltage at capacitor C3 two ends is raised to the resetting voltage of 555,555 time base circuits reset again, and audion V3 turns on, and V1, V2 end, power supply is added in load two ends again, if also in, under overcurrent conditions, said process being repeated, until load powers on to flow down and drops to normal value。Thus having reached overcurrent protection effect。If there is overpressure situation in civil power; overvoltage in load is added on potentiometer RP1; the current potential making stabilivolt D3 positive pole increases; cause that stabilivolt D3 punctures so that audion V2 turns on, and 555 time base circuits will be in SM set mode; again such that audion V3 cut-off; relay K action, contact K-1 disconnects, and has reached the effect of overvoltage protection。Can be facilitated by the change of light emitting diode D1 and D2 and judge overvoltage protection or overcurrent protection accurately。

Claims

1. a safety protection switch power circuit, including transformator W, rectifier bridge T, chip IC 1 and relay K, it is characterized in that, one end of the winding N1 of described transformator W connects contact K-1 and the 220V alternating current of relay K, the other end of the winding N1 of transformator W connects the other end of load A and 220V alternating current, the two ends of the winding N2 of transformator W connect the port 1 of rectifier bridge T and the port 3 of rectifier bridge T respectively, and the port 2 of rectifier bridge T connects resistance R2, resistance R4, the emitter stage of audion V3, electric capacity C1, the pin 4 of chip IC 1 and the pin 8 of chip IC 1, the other end of electric capacity C1 connects electric capacity C2, electric capacity C3, the port 4 of rectifier bridge T, relay K, the negative electrode of diode D1, the emitter stage of audion V1, the pin 1 of resistance R6 and chip IC 1, the pin 3 of chip IC 1 connects resistance R1, the other end of resistance R1 connects the other end of relay K and the anode of diode D1, the pin 7 of chip IC 1 connects resistance R3, the other end of resistance R3 connects the other end of resistance R4 and the base stage of audion V3, and the other end of resistance R2 connects the other end of electric capacity C3, the anode of diode D2, the colelctor electrode of audion V2, the pin 2 of chip IC 1 and the pin 6 of chip IC 1, the colelctor electrode of the negative electrode connecting triode V1 of diode D2, the base stage of audion V1 connects the other end of the other end connection resistance R6 of resistance R5, resistance R5, resistance R7, the emitter stage of the fixing end of of potentiometer RP1 and audion V2, the base stage of audion V2 connects the anode of diode D3, the negative electrode of diode D3 connects the sliding end of potentiometer RP1, the colelctor electrode of audion V3 connects the other end of resistance R7 and another fixing end of potentiometer RP1, and the model of described chip IC 1 is NE555。

2. safety protection switch power circuit according to claim 1, it is characterised in that described diode D1 is light emitting diode。