CN2176614Y

CN2176614Y - Automatic switch for leakage, overvoltage, overcurrent and short circuit protections

Info

Publication number: CN2176614Y
Application number: CN 93235283
Authority: CN
Inventors: 朱志杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-12-23
Filing date: 1993-12-23
Publication date: 1994-09-07
Anticipated expiration: 2003-12-23

Abstract

The utility model relates to an automatic switch for leakage, overvoltage, overcurrent and short circuit protections. The outputs of a signal rectifying filter circuit, a comparison circuit, and an antijamming circuit are directly connected to a drive circuit. The inputs of the signal rectifying filter circuit and the comparison circuit are respectively from a leakage signal detecting circuit and a power supply voltage detecting circuit. The output of the drive circuit is connected with a tripping mechanism. The utility model has the advantages of simple circuits, complete protection functions, and reliable performance.

Description

Automatic switch for leakage, overvoltage, overcurrent and short circuit protections

The utility model relates to a kind of power supply Automatic Protection Switching device, particularly a kind of automatic power switch with electric leakage, overvoltage, overcurrent, short circuit integrated protection function.

Existing widely used power supply Automatic Protection Switching; earth leakage circuit-breaker for example; over-current and-load Automatic Protection Switching etc.; it mostly is the product of simple function; thereby range of application is subjected to certain restriction, and some line design complexity is affected reliability; particularly when the low-voltage network neutral line (being zero line) disconnects, can not realize protection well.

The purpose of the utility model aim to provide a kind of have electric leakage, overvoltage, overcurrent, short circuit integrated protection, circuit simple, use reliable, antijamming capability is strong, widely used comprehensive Automatic Protection Switching.

Fig. 1 is the utility model electricity theory diagram.

Among Fig. 1,1-leakaging signal detecting circuit 2-signal rectification filter circuit

3-voltage detection circuit 4--comparison circuit

5-drive circuit 6-tripping mechanism 7-anti-jamming circuit

Fig. 2 is the utility model circuit diagram.

Technical solution of the present utility model is: this electric leakage and over-voltage and over-current short circuit integrated protection automatic switch are made up of leakaging signal detecting circuit (1), signal rectification filter circuit (2), voltage detection circuit (3), comparison circuit (4), drive circuit (5), tripping mechanism (6), anti-jamming circuit (7); the output of signal rectification filter circuit (2), comparison circuit (4), anti-jamming circuit (7) is connected directly to drive circuit (5), and signal rectification filter circuit (2) and comparison circuit (4) input is then respectively from leakaging signal detecting circuit (1) and voltage detection circuit (3); the output of drive circuit (5) connects tripping mechanism (6); tripping mechanism (6) connects or cuts off out-put supply, realizes the comprehensive automatically protection to electrical appliance.

Be described in further detail below in conjunction with 2 pairs of the technical solution of the utility model of accompanying drawing:

As shown in Figure 2; leakaging signal detecting circuit of the present utility model is made of instrument transformer CT; the two ends output of coil is as signal rectification filter circuit (D1～D4; C1) (the interchange input of D1～D4) of rectifier bridge; drive circuit is made of controllable silicon T; voltage detection circuit is by another rectifier bridge D5～D8; dc partial voltage resistance R 4; R5 constitutes; resistance R 4; two ends, R5 series connection back are connected to the positive-negative output end of rectifier bridge D5～D8 respectively; the rectifier bridge of voltage detection circuit exchanges input and is connected by two power lines; wherein a power line also is in series with the coil L of tripping mechanism; comparison circuit is made of voltage stabilizing didoe WYD; two ends are connected to the dc partial voltage resistance R 4 of trigger electrode and the voltage detection circuit of drive circuit controllable silicon T respectively; R5 connects mid point; anti-jamming circuit is by piezo-resistance R2; resistance R 3; capacitor C 2 constitutes; resistance R 3; after capacitor C 2 serial connections; two ends are attempted by between the positive-negative output end of rectifier bridge D5～D8; that is be attempted by the positive negative electrode of controllable silicon T; piezo-resistance R2 two ends then respectively and be connected to rectifier bridge (two ac input ends of D5～D8) of voltage detection circuit; in addition; the utility model also is serially connected with electromagnetism overcurrent coil EL and bimetal leaf SB in power supply output line; K switch of their same control tripping mechanisms is with as overcurrent and short-circuit protection.

The course of work:

When human electric shock or line electrical leakage take place when, the magnetic test coil of leakaging signal detecting circuit detects electric leakage signal, become pulsating dc voltage by the signal rectification filter circuit, be connected to the control utmost point of controllable silicon T, when level magnitude surpasses the trigger value of controllable silicon T, the controllable silicon conducting, the coil L of tripping mechanism obtains enough electric currents, produce electromagnetic force, drive K switch, at 0.1 second internal cutting off out-put supply.

When power network line voltage rises to 250V when above by 220V, take a sample by the supply voltage that resistance R 4, R5 constitute, obtain the overvoltage signal, surpass the comparison circuit critical value that constitutes by WYD when its value, the WYD conducting triggers controllable silicon T, and the coil L of tripping mechanism is by enough electric currents, out-put supply is cut off in the K switch disjunction equally.

When load or circuit were short-circuited fault, the electromagnetism overcurrent coil EL of switch inside produced electromagnetic force, pull switch K action; tripping operation, when protected circuit generation overcurrent, the bimetal leaf SB of switch inside bends; the action of drive K switch makes it tripping operation, has realized automatic protection simultaneously.

The anti-jamming circuit of piezo-resistance R2, resistance R 3, capacitor C 2 is mainly used to lightning impulse resistant and absorbs power voltage surge.

Knob SA and resistance R 1 are electric leakage, human electric shock's simulated experiment knob.

The utility model circuit is simple, dependable performance, antijamming capability is strong, defencive function is complete, can be widely used on industry and the civil electrical circuit, is subjected to the favorable comment of brainstrust.

Claims

1; a kind of electric leakage and over-voltage and over-current short circuit integrated protection automatic switch; it is characterized in that by leakaging signal detecting circuit (1); signal rectification filter circuit (2); voltage detection circuit (3); comparison circuit (4); drive circuit (5); tripping mechanism (6); anti-jamming circuit (7) is formed; signal rectification filter circuit (2); comparison circuit (4); the output of anti-jamming circuit (7) is connected directly to drive circuit (5); the input of signal rectification filter circuit (2) and comparison circuit (4) is then respectively from leakaging signal detecting circuit (1) and voltage detection circuit (3); the output of drive circuit (5) connects tripping mechanism (6), and tripping mechanism (6) connects or the cut-out out-put supply.

2, according to the automatic switch of claim 1, it is characterized in that (D5～D8), dc partial voltage resistance R 4, R5 constitute voltage detection circuit (3), and resistance R 4, two ends, R5 series connection back are connected to the rectifier bridge (positive-negative output end of D5～D8) respectively by rectifier bridge.

3, according to the automatic switch of claim 1 or 2, it is characterized in that comparison circuit (4) is made of voltage stabilizing didoe WYD, two ends are connected to the trigger electrode of drive circuit controllable silicon (T) and the mid point that is connected of dc partial voltage resistance R 4, R5 respectively.

4, according to the automatic switch of claim 1 or 2, it is characterized in that anti-jamming circuit (7) is made of piezo-resistance (R2), resistance (R3), electric capacity (C2), (between the positive-negative output end of D5～D8), piezo-resistance (R2) two ends then respectively and be connected to rectifier bridge (two ac input ends of D5～D8) to be attempted by rectifier bridge after 2 series connection of resistance R 3, capacitor C.

5,, it is characterized in that leakaging signal detecting circuit (1) is made of instrument transformer (CT) according to the automatic switch of claim 1.

6,, it is characterized in that drive circuit (5) is made of controllable silicon (T) according to the automatic switch of claim 1.