CN2157613Y

CN2157613Y - Multifunctional emergency protection circuit arrangement

Info

Publication number: CN2157613Y
Application number: CN 93215540
Authority: CN
Inventors: 黄万昌
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-07
Filing date: 1993-06-07
Publication date: 1994-02-23
Anticipated expiration: 2003-06-07

Abstract

The utility model relates to an emergency protective circuit device, which is the improvement of the existing protector for electricity leakage. A positive-feedback self-locking circuit from a trigger to a signal amplifying pole is matched with the time-delay reset circuit of the signal amplifying pole, and when accidents are not yet eliminated, the utility model can realize the power-off self locking. The device is provided with an over-voltage detecting circuit and an over-current detecting circuit which use current mutual inductors for electric leakage and which work in the mode of the simulation of the electric leakage; the utility model is also provided with a starting time-delay circuit for a refrigerator; thus the product of the utility model becomes a multi-functional circuit protecting device.

Description

Multifunctional emergency protection circuit arrangement

The utility model relates to a kind of emergency protective circuit device, belongs to and comprises earth leakage protective multifunctional circuit technical field of safety devices at least.

Though existing electric leakage safety circuit device can cut off the power supply under accident situation automatically, and eliminate the back in accident and recover automatically to send, but general employing is simple delay circuit, promptly whether eliminate regardless of accident, safety device outage-time-delay-this process of power supply-outage that circulates repeatedly, bring harmful effect under not elimination situation of accident, can for equipment or personnel, so most of electric leakage safety circuit device is simply cast out the automatic time delay function that restores electricity, and the employing artificial treatment, this makes troubles to use again certainly.

The purpose of this utility model is that disclosing a kind of is the multifunctional emergency protective circuit device that the time-delay auto-lock function is arranged, and is the improvement to existing electric leakage safety circuit device.

Task of the present utility model is achieved in that comprises an electric-leakage detection circuit at least; contain in the emergency protective circuit device of the signal amplification circuit of time-delay reset circuit and trigger control circuit; also be provided with by the positive feedback latching circuit of trigger control circuit to signal amplification circuit; be provided with a RC integrating circuit in this regenerative circuit, and the feedback path behind integrating circuit is provided with blocking diode.

Main feature of the present utility model is set regenerative circuit first course of work in electric leakage signal amplification and trigger control circuit, integrating capacitor only can partly be charged, blocking diode can not conducting, do not get rid of as if accident behind the time-delay reset when the first time, signal amplification circuit and trigger control circuit are still worked, continuation is charged to integrating capacitor, until reaching threshold values and opening blocking diode, form voltage positive feedback, with the trigger control circuit self-locking, can avoid time-delay reset circuit periodic duty before accident is eliminated like this, cause harm for equipment and people.Except that the electric leakage protective device was touched in conduct, the utility model also can add overcurrent, overvoltage detection and refrigerator easily and start delay circuit, makes product become a kind of multifunctional safe protective device.

With regard to drawings and Examples the utility model is specified below.

Fig. 1 is a circuit block diagram.

Fig. 2 is circuit theory diagrams.

Touch electric-leakage detection circuit 1, over-current detection circuit 2 and over-voltage detection circuit 3 among Fig. 1 and from mains-supplied circuit 4, obtain trouble signal, after signal amplification circuit 5 amplifies,, cut off electric current by Schmidt trigger circuit 6 control relays 7.Be provided with time-delay reset circuit 8 in the signal amplification circuit 5, from Schmidt trigger circuit 6 to also being provided with a positive feedback latching circuit 9 between the signal amplification circuit 5.Startup delay circuit 10 can be refrigerator provides special service.Regulator rectifier circuit 11 provides direct voltage for each circuit.

Fig. 2 testing circuit mainly comprises a zero sequence current mutual inductor ZCT, and its coil L2 and L3 are serially connected in respectively among the phase line AA ' and zero line OO ' of supply line.When touching leakage current and flow through L2, produce the zero sequence magnetic flux in the magnet ring, coil L4 just has induced voltage output.Piezo-resistance RMG cross-over connection between coil L3 input and L2 output, is just formed overvoltage and detects, and during for the electrical network overvoltage, piezo-resistance RMG resistance descends, and forms the simulation electric leakage.Coil L1 is serially connected with phase line AA ', constitutes over-current detection with tongue tube JAG and since tongue tube JAG as described the same cross-over connection of piezo-resistance RMG between coil L3 and L2, so when the load overcurrent, tongue tube JAG closure forms simulation and leaks electricity equally.Amplifier pipe IC1 and IC2 are that two-stage signal is amplified, and the detection signal that coil L4 is exported is amplified to required trigger voltage.Resistance R 2, R3 and capacitor C 1 are time-delay reset circuit, when the accident detection signal is arranged, the output of IC1 is charged to C1 simultaneously, so when electric is cut off, voltage on the C1 still can make IC2 export required trigger voltage, C1 is through R3, R2 and coil L4 discharge then, until the output voltage of IC2 less than triggering required following threshold values, circuit reset.IC4 is a Schmidt trigger circuit, its end of oppisite phase is connected with a valve value regulating circuit, resistance R 6, R7 and R8 go here and there in DC power supply, crystal BG and resistance R 8 also connect switch of formation, its base stage is connected with trigger IC4 output, like this when trigger IC4 is output as high level, the BG conducting, the IC4 end of oppisite phase is in the lower limit threshold values.The variation of trigger IC4 end of oppisite phase set point is finished time-delay reset with aforementioned time-delay with cooperate during work, and relay J is by the output level control of trigger IC4, and its normally-closed contact K is serially connected among the phase line AA '.By the output of trigger IC4 to also being provided with one between the normal phase input end of amplifying stage IC2 by resistance R 9, RW, the positive feedback latching circuit that capacitor C 2 and diode DW form.Its work was divided into for two steps: when circuit is in first delay cycle, capacitor C 2 can only partly be charged, still deficiency is so that the DW conducting, so positive feedback does not form, if the accident detection signal still occurs, C2 continues charging when time-delay reset, make the DW conducting at last, form the positive feedback self-locking, make relay J keep attracting state, wait for artificial treatment.

Trigger IC3 is that refrigerator starts the time-delay special use, and it and IC4 use same output circuit and end of oppisite phase threshold values control circuit, and its positive terminal is connected with resistance R 4, R5, capacitor C 3 and selector switch K1-1, constitutes a delay circuit.When selector switch K1-1 was closed, this circuit entered operating state.During grid power blackout, capacitor C 3 is discharged through R4; When restoring electricity, supply voltage earlier adds to the IC3 positive terminal through K1-1 and C3, makes IC3 output high level, and C3 charges through R5 then, and IC3 positive terminal voltage descends, until less than the lower limit threshold values.K switch 1-2 is connected in parallel on the RW two ends, this switch and K1-1 interlock, and when device selected refrigerator to start delay function, regenerative circuit was influenced by time-delay reset circuit no longer, directly enters self-locking state.

Push-button switch AN2 is in parallel with capacitor C 2, after the circuit self-locking, presses AN2 and can make circuit remove self-locking.Whether push-button switch AN1 after resistance R 1 cross-over connection in parallel with tongue tube JAG between L2, L3, pressed AN1 and can be simulated electric leakage, normal with checking circuit work.

Claims

1, a kind of multifunctional emergency protective circuit device; by electric-leakage detection circuit; the signal amplification circuit and the trigger control circuit that contain time-delay reset circuit are formed; it is characterized in that also being provided with one by the positive feedback latching circuit of trigger control circuit to signal amplification circuit; be provided with a RC integrating circuit in this circuit, blocking diode is located in the positive feedback passage between this integrating circuit and the signal amplification circuit.

2, by the described multifunctional emergency protective circuit of claim 1 device, it is characterized in that described electric-leakage detection circuit is zero sequence current mutual inductor ZCT.

3,, it is characterized in that cross-over connection piezo-resistance RMG between the magnetic ring coil L2 of described zero sequence current mutual inductor ZCT and the L3 by the described multifunctional emergency protective circuit of claim 2 device.

4, by the described multifunctional emergency protective circuit of claim 2 device, it is characterized in that cross-over connection tongue tube JAG between magnetic ring coil L2, the L3 of described zero sequence current mutual inductor ZCT, the control coil L1 of this tongue tube JAG is connected in series with in the phase line.

5, by the described multifunctional emergency protective circuit of claim 1 device; it is characterized in that also being provided with a refrigerator and start delay circuit; this circuit is Schmidt trigger IC3, is provided with C3 and R5 delay circuit in its input circuit, and capacitor C 3 is connected with DC power supply through selector switch K1-1.