CN2234660Y

CN2234660Y - Multifunctional electric leakage protection switch

Info

Publication number: CN2234660Y
Application number: CN 95205891
Authority: CN
Inventors: 谭均恒
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-03-23
Filing date: 1995-03-23
Publication date: 1996-09-04
Anticipated expiration: 2005-03-23

Abstract

The utility model relates to a multifunctional electric leakage protection switch. Compared with the existing electric leakage protection switch, the utility model has the differences that the zero line and the live wire of the main circuit of the utility model do not pass through a zero sequence mutual inductor, a primary coil L1 is coiled on an arranged signal transformer B1, one end of the primary coil is connected with the zero line, the other end of the primary coil is connected with an electric leakage detector head ZH contacted with a protection device, a primary coil L2 is coiled on the signal transformer B1, both ends of the primary coil L2 are connected with an amplifier IC1, and the amplifier IC1 is connected with a trip coil. When the current leakage occurs, the induced current of the primary coil L1 is amplified by the amplifier IC1 to make a trip cut off the current. The utility model has the advantages of no misoperation generation, safety and reliability.

Description

The multifunctional electric leakage protection switch

The utility model relates to a kind of multifunctional electric leakage protection switch, can with the supporting use of fast shower, also can with the supporting use of other electrical installation, in order to a kind of protection switch that detects, prevents to leak electricity and hurt sb.'s feelings.

In the existing technology, the basic function of earth leakage protective device is when the human electric shock, does not cut off the electricity supply automatically when current strength and time reach extent of injury as yet, to reach the purpose of protection personal safety.Even get an electric shock but the human electric shock is slight, always human body there is certain infringement, be to make us uncomfortable.This scheme is not optimal so design is cut off the electricity supply behind the human electric shock again.On the loop, the scheme that existing technology also adopts is that major loop passes through zero-sequence transformer, changes the electric leakage signal of major loop into the loop voltage signal and release is disconnected the method that makes the major loop outage by tripping coil after amplifying.But owing to live wire, zero line process zero-sequence transformer, influence zero-sequence transformer work, can cause the release misoperation.So above-mentioned earth leakage protective device is not a preferred plan.Live wire in the at present popular rapid hot water shower major loop, neutral line current are uneven all the time, can't also have this problem with the supporting use of above-mentioned earth leakage protective device.

As long as the purpose of this utility model is to have electric leakage to produce the new type electric leakageproof switch that can cut off the power supply automatically and can not produce misoperation at the problems referred to above design is a kind of.

Scheme of the present utility model is as follows: major loop does not pass through zero-sequence transformer, but establishes a signal transformer B in addition ₁, this signal transformer B ₁On two coils are arranged, first coil L ₁With inferior coil L ₂Just coil has only several circles, more than the hundreds of circles of inferior coil.Just an end at the two ends of coil and the zero line of major loop join, and the other end is connected to a detection of electrical leakage head, receive on the shell of shower or employed household electrical appliance, when electric leakage produces, are found out by this detection head, make around B ₁On first coil L ₁And time coil L ₂Induced current is arranged.L ₂The voltage signal that two ends produce threads off release after amplifier amplifies automatically, and major loop is disconnected, and reaches the purpose of protection personal safety.

The utility model is simple in structure, owing to use detection head to find out electric leakage, so changed the present anticreeping switch un-reasonable phenomenon that could cut off the power supply automatically when not reaching certain intensity and injury and spend when the person gets an electric shock.Simultaneously owing to not being that the current imbalance that major loop is produced by zero-sequence transformer reaches the purpose of cutting off major loop, so also can not produce misoperation.Safer, more reliable, can not work the mischief fully to human body.

Below in conjunction with drawings and Examples the utility model is illustrated.

Fig. 1 is the line assumption diagram of the utility model embodiment 1, and Fig. 2 is the line assumption diagram of embodiment 2, and Fig. 3 is IC ₁Structure chart.

Embodiment 1:

Two line O-O, H-H of major loop connect the power supply of shower PN respectively by two contact JK-1, the JK-2 of release.Signal transformer B ₁First coil L ₁, inferior coil L ₂Just an end of coil and the zero line of major loop are connected, and the other end is connected to a detection of electrical leakage ZH, and the shell of this detection of electrical leakage ZH and shower PN (or other tested household electrical appliance and electric welding machine etc.) contacts.When electric leakage produced, electric current passed through L by ZH to A point ₁Be back to zero line, make and L ₁Unroll at B ₁On L ₂Produce induced current, L ₂Two ends and amplifier IC ₁Connect L ₂An end enter amplifier by the Q point, the other end passes through K ₃IC ₁IC ₁Output (11) make tripping coil J charged, and drive release JK-1, JK-2 disconnected, reached the purpose of protection personal safety.Principal current is without signal transformer.K ₄Whether can operate as normal, and B if being used to detect this detection of electrical leakage switch ₁On coil L ₃Join.

Embodiment 2:

This device also can be provided with zero-sequence transformer B simultaneously ₂(as shown in Figure 2), with double-pole switch K ₃Pull side to D, when electric leakage produces, B ₂On L ₅Induced current by Q, D dual-point entry IC ₁JK-2, the JK-1 of release threaded off, and used electric device MP is protected.Work as K ₃Reach linked switch and pull when f, ZH detects electric leakage by probe.

Detection of electrical leakage probe ZH available metal sheet or pin are made.Only the shell of need and protected device contacts, and just can make L when electric leakage produces ₁Produce induced current.When the shell of protected device was goods such as plastics (as shower), probe was positioned on water outlet place.

As shown in Figure 3, used amplifier IC ₁Available C ₁₅₈₃And peripheral circuit is formed.Work as IC ₁The output 4 alternating-current switch connection that makes emitter follower Q trigger controllable silicon SCR and then make controllable silicon and form with rectifier bridge VC.

Claims

1, multifunctional electric leakage protection switch comprises signal amplifier IC ₁, the zero line O-O of major loop and live wire H-H join by two contact JK-2, JK-1 back of release J and zero line and the live wire of protected device (or shower) PN respectively, it is characterized in that above-mentioned earth leakage circuit-breaker has a signal transformer B ₁, B ₁On first coil L ₁Zero line O-the O of one end and major loop joins, first coil L ₁The other end be connected to detection of electrical leakage probe ZH, shell or water outlet place of the termination of ZH and protected device PN contact, at above-mentioned B ₁On also be wound with another coil L simultaneously ₂, L ₂Two ends and signal amplifier IC ₁Input join IC ₁Output (11) and tripping coil J join.

2, multifunctional electric leakage protection switch according to claim 1 is characterized in that above-mentioned detection of electrical leakage probe ZH can be made of metal.