CN2728069Y

CN2728069Y - High voltage electric leakage protector

Info

Publication number: CN2728069Y
Application number: CN 200420074532
Authority: CN
Inventors: 田玉江
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-08-25
Filing date: 2004-08-25
Publication date: 2005-09-21
Anticipated expiration: 2014-08-25

Abstract

The utility model relates to a high voltage electric leakage protector, a current mutual inductor ZL is connected with the input terminal of an electric leakage protective application-specific integrated circuit IC, and the output terminal of the integrated circuit IC is connected with the trigger electrode of controlled silicon. The high voltage electric leakage protector is characterized in that the controlled silicon is composed of two controlled silicon Q1 and Q2 connected in series, and the trigger electrodes of the two controlled silicon are respectively connected with the output terminal of the integrated circuit IC. The utility model has high overpressure resistant value and the breakdown failure is not easy to happen.

Description

The high voltage earth leakage protective device

Technical field

The utility model belongs to circuit protection device, particularly relates to a kind of earth leakage protective device.

Background technology

Present popular on the market leakage protection switch circuit; when improper situation (human electric shock etc.); all utilize leakage current to trigger a controllable silicon and control drop-away current realization tripping operation outage; and silicon controlled is withstand voltage limited; in the circuit of high pressure AC380V, just be easy to occur breakdown fault, bring very big hidden danger of quality to product.

Summary of the invention

The purpose of this utility model provides a kind of withstand voltage height, is not easy to occur the high voltage earth leakage protective device of breakdown fault.

For achieving the above object; the technical solution adopted in the utility model is: a kind of high voltage earth leakage protective device; current transformer ZL connects earth leakage protective application-specific integrated circuit (ASIC) IC input; integrated circuit (IC) output termination controllable silicon trigger electrode; described controllable silicon is controllable silicon Q1, the Q2 of two series connection, and its trigger electrode connects the output of integrated circuit (IC) respectively.

Output 7 pin of earth leakage protective integrated circuit (IC) are connected on the trigger electrode of controllable silicon Q1; the negative electrode of controllable silicon Q2 connects the zero line side of earth leakage circuit-breaker output loading end; after connecting with Q2, Q1 is connected on the live wire end of earth leakage circuit-breaker output loading end by tripping coil JL; the negative electrode of Q1 and the anode of Q2 together are attempted by earth terminal 6 pin of IC; 6 pin of one termination IC of capacitor C 5; the trigger electrode of another termination controllable silicon Q2, and by ground connection after resistance R 5 dividing potential drops.

Leakage protection switch circuit of the present utility model utilizes the outage that realizes tripping of the common control in two controllable silicons series connection back drop-away currents; share supply voltage because be jointly after two controllable silicon series connection; so that the voltage that is added on every controllable silicon has reduced half; alleviate the silicon controlled burden greatly, improved reliability of products.

Description of drawings

Accompanying drawing is depicted as circuit theory diagrams of the present utility model.

Embodiment

As shown in the figure, input 2,3 pin of earth leakage protective application-specific integrated circuit (ASIC) IC (FM2140) are received at the two ends of instrument transformer ZL by R1, C2, output 7 pin of IC are connected on the trigger electrode of controllable silicon Q1, the negative electrode of controllable silicon Q2 meets the zero line N of earth leakage circuit-breaker output loading end, after connecting with Q2, Q1 is connected on the live wire L of earth leakage circuit-breaker output loading end by tripping coil JL, the negative electrode of Q1 and the anode of Q2 together are attempted by earth terminal 6 pin of IC, the termination IC6 pin of C5, the trigger electrode of another termination controllable silicon Q2, and by ground connection after the R5 dividing potential drop; Power supply connects 5,6 pin of IC by R6, R4, provides necessary working power to IC, need not to add in addition the AC-DC change-over circuit.

During use, press reset button, switch JK energized, ZL powers to the load by instrument transformer; Under the normal condition, by the load current equal and opposite in direction of instrument transformer ZL, direction is opposite, and cancelling out each other is zero; The non-inductive electric current signal of instrument transformer ZL, the also no signal output of 6,7 pin of IC, controllable silicon Q1, Q2 are in cut-off state, and tripping coil JL has only very little IC supply current, the not stretchy release tripping operation of the Weak magentic-field of its generation, circuit is kept the normal power supply state.

During improper situation (load end has electric leakage); leakage current on the live wire is after passing instrument transformer ZL; directly work hard in glove with and form the loop by human body grounding and power supply; rather than work hard in glove with the formation loop with power supply by another zero (N) line of instrument transformer ZL; so instrument transformer ZL will sense leakage current signal; and pass through R1; C2 is added to the input 2 of IC; 3 pin; amplify through the IC computing; latch and trigger the back from 6; 7 pin output to controllable silicon Q1; the trigger electrode of Q2; order about Q1; Q2 is saturation conduction simultaneously; make tripping coil JL by very big electric current and produce high-intensity magnetic field pulling release tripping operation outage, reach the purpose of protection personal safety.

Claims

1, a kind of high voltage earth leakage protective device; current transformer ZL connects earth leakage protective application-specific integrated circuit (ASIC) IC input; integrated circuit (IC) output termination controllable silicon trigger electrode; it is characterized in that; described controllable silicon is controllable silicon Q1, the Q2 of two series connection, and its trigger electrode connects the output of integrated circuit (IC) respectively.

2, earth leakage protective device as claimed in claim 1; it is characterized in that; output 7 pin of earth leakage protective integrated circuit (IC) are connected on the trigger electrode of controllable silicon Q1; the negative electrode of controllable silicon Q2 connects the zero line side of earth leakage circuit-breaker output loading end; after connecting with Q2, Q1 is connected on the live wire end of earth leakage circuit-breaker output loading end by tripping coil JL; the negative electrode of Q1 and the anode of Q2 together are attempted by earth terminal 6 pin of IC; 6 pin of one termination IC of capacitor C 5; the trigger electrode of another termination controllable silicon Q2, and by ground connection after resistance R 5 dividing potential drops.