CN2355484Y - Protector for electric leakage ard electric shock - Google Patents

Abstract

The utility model relates to a protector for electric leakage and electric shock which is a safeguard device. The control circuit comprises a CPU circuit, an executive, status indication and timing circuit connected with the output and reset terminal of the CPU circuit, a reference, reference enlarge and shaping trigger circuit connected with the input terminal of the CPU circuit, a sensor, limiter amplification, enlarge and shaping trigger circuit, a sensor, limiter amplification, accumulator, follower, amplifier and V/F conversion circuit and a power circuit. The utility model overcomes the problem of leaking, contacting point protection blind area, which has compact structure, convenient installation, high sensibility and strong reliability.

Description

A kind of electric leakage electric protective device

The utility model relates to a kind of electric leakage electric shock and uses protective device, and particularly a kind of intelligent electric leakage electric protective device belongs to electric and electronic technical field.

The electric leakage electric protective device is steelyard slepsydra electricity protector again, is a kind of more common electric power safety protective device.There are following defective in phase discriminator type in the past, pulsed protector: 1, can only do qualitative analysis to touching electric leakage signal, can't do quantitative analysis, there is the protection dead band,, often exists two-phase in the three-phase to produce unreliable action or be failure to actuate promptly owing to the vector superposed reason of alternating current; 2, poor anti jamming capability also promptly very easily produces misoperation under extraneous interference signal effect; 3, the circuit design of such device adopts analog circuit more usually, makes that control precision and antijamming capability are low; 4, for distinguishing electric leakage and getting an electric shock, this class device often can not be analyzed solution quantitatively.

The purpose of this utility model is to provide a kind of elimination electric leakage electrical shock protection dead band, improves antijamming capability, to the new pattern creepage electric protective device of electric leakage, contact energy quantitative analysis judgement.

For reaching above-mentioned purpose, the utility model is taked following technical scheme: the utility model is made up of shell and control circuit, be provided with cpu circuit 11 in the control circuit, cpu circuit 11 outputs connect executive circuit 17, condition indication circuit 15, cpu circuit 11 reset terminals connect timer circuit 16, reference circuit 12 connects benchmark amplifying circuit 13 in regular turn, shaping triggers II circuit 14 backs and links to each other with an input of cpu circuit 11, sensor circuit 1 connects amplitude limiting amplifier circuit 2 in regular turn, amplifying circuit 5, shaping triggers I circuit 8 backs and links to each other with an input of cpu circuit 11, sensor circuit 1 also connects amplitude limiting amplifier circuit 2 in regular turn, adder circuit 3, follower I circuit 4, follower II circuit 6, amplifier circuit 9, V/F translation circuit 10 backs link to each other with an input of cpu circuit 11, also comprise power circuit 18 in the control circuit.

Also be provided with display circuit 7 between follower II circuit 6 and the sensor circuit 1 in the control circuit.

Sensor circuit 1 is a current transformer L.Amplitude limiting amplifier circuit 2, adder circuit 3, follower II circuit 6, follower I circuit 4, amplifier circuit 9, amplifying circuit 5, benchmark amplifying circuit 13 is made of operational amplifier integrated circuit (IC) 1-IC7 and peripheral circuit respectively, shaping triggers I circuit 8, shaping triggers II circuit 14 and triggers integrated circuit (IC) 9 by shaped pulse respectively, IC8 and peripheral circuit constitute, V/F translation circuit 10 is made of integrated V/F change-over circuit IC15 and peripheral circuit, cpu circuit 11 is made of single-chip microcomputer integrated circuit (IC) 10, timer circuit 16 is made of integrated timer IC circuit 14 and peripheral circuit, power circuit 18 is by transformer T, three grades of integrated regulator IC11-IC13 and peripheral circuit constitute, transformer T secondary coil in the power circuit 18 constitutes reference circuit 12, the triode that condition indication circuit 15 is connected by the cpu circuit output, the resistance that is connected with the triode output, luminous tube constitutes, executive circuit 17 is by the triode that is connected with the cpu circuit output, and the relay J that is connected with the triode output constitutes.

Display circuit 7 is made of ammeter A, potentiometer and the button AN of serial connection.

Sensor circuit 1 is sent into detected synthetic leakage, shock current signal in amplitude limiting amplifier circuit 2, amplifying circuit 5, follower 1 circuit 4 and the follower II circuit 6, amplitude limiting amplifier circuit 2 outputs link to each other with amplifying circuit 5 with adder circuit 3 respectively, adder circuit 3 links to each other with follower I circuit 4, the output of follower I circuit 4 respectively with adder circuit 3, the input of follower II circuit 6, display circuit 7 links to each other.Two inputs of amplifying circuit 5 connect the output of sensor circuit 1, amplitude limiting amplifier circuit 2 respectively, and its output signal is sent into cpu circuit 11 after shaping triggers 8 shapings of I circuit; Two inputs of follower II circuit 6 connect the output of sensor circuit 1 and follower I circuit 4 respectively, its output connects display circuit 7 and amplifier circuit 9 respectively, voltage signal after amplifier circuit 9 amplifies is transformed into frequency signal through V/F translation circuit 10 and sends in the cpu circuit 11, and display circuit 7 also joins with an end of sensor circuit 1; The reference signal of reference circuit 12 is amplified after the shaping of shaping triggering II circuit is sent in the cpu circuit 11 through benchmark amplifying circuit 13; Timer circuit 16 is integrated timer circuit, this timing signal is sent into the reset terminal of cpu circuit 11, the working state signal of cpu circuit 11 is sent in the condition indication circuit 15 to show the different operating state, its working signal is sent in the executive circuit 17, and power circuit 18 provides different operating voltages for whole circuit.

Operation principle of the present utility model is: synthetic leakage current vector of sensor circuit output, comprise the electric shock component of sudden change and gradual electric leakage component, amplify add operation through amplitude limit, amplify then by entering CPU after the V/F conversion, detect synthetic leakage current amplitude; The reference signal of reference circuit output is sent into CPU through amplifying shaping, the detected synthetic electric leakage shock current of sensor circuit enters CPU, CPU through the amplification shaping this signal and reference signal is carried out information processing, with leak, the phase place of shock current detects and further determine electric leakage signal or electric shock signal, CPU carries out the calculating of the phase place of leakage current and amplitude and compares with setting value then, to judge whether to trigger the executive circuit action.Timer circuit plays the effect that the operating state of CPU is monitored, and assurance whole C PU system reliably accurately works.

The utlity model has the even type of very high sensitivity and sensitivity, and the influence of not leaked electricity of sensitivity, overcome the protection dead-time problem of leakage, electric shock fully; Can distinguish electric leakage and electric shock state exactly; Adopt the multi-stage protection form, have high protection reliability; Have circuit electric leakage adaptivity, can adjust voluntarily whole line work state; Also have self check simultaneously and send the electric work energy certainly; The utility model also has compact conformation, and the cost performance height is installed and used advantages such as simple.

Accompanying drawing and drawing explanation:

Fig. 1-control circuit electricity functional-block diagram of the present utility model;

The most preferred embodiment electrical schematic diagram of Fig. 2-the utility model control circuit.

In the drawings, 1 sensor circuit, 2 amplitude limiting amplifier circuits, 3 adder circuits, 4 follower I circuit, 5 amplifying circuits, 6 follower II circuit, 7 display circuits, 8 shapings trigger I circuit, 9 amplifier circuits, 10V/F translation circuit, the 11CPU circuit, 12 reference circuits, 13 benchmark amplifying circuits, 14 shapings trigger II circuit, 15 condition indication circuits, 16 timer circuits, 17 executive circuits, 18 power circuits, a, b, c, d, e, f, g are respectively each corresponding interconnection point of circuit.

Below in conjunction with accompanying drawing the utility model is described further.

With reference to Fig. 1, Fig. 2, the most preferred embodiment that the utility model provides is: sensor circuit 1 is a current transformer L.Integrated circuit (IC) 1 and diode D6, D7, resistance R 26, R27 form limiting amplifier 2, two inputs of IC1 link to each other with L, and its output links to each other with adder circuit 3 and amplifier circuit 5 respectively, and adder circuit 3 is made up of IC2 and resistance R 28, R29, potentiometer RP4 and diode D12.The inverting input of IC2 connects the output of amplitude limiting amplifier circuit 2, the output of follower I circuit 4 respectively, and its in-phase input end connects the end of instrument transformer L, and its output links to each other with the in-phase input end of follower I circuit 4.Integrated circuit (IC) 4 and resistance R 30, R31 form follower I circuit 4, the in-phase input end of IC4 links to each other with the output of IC2, inverting input links to each other with output and IC2 inverting input, and its output also joins with the in-phase input end of display circuit 7 and follower II circuit 6.Amplifying circuit 5 is integrated circuit (IC) 6, and its in-phase input end links to each other with L one end, and end of oppisite phase links to each other with the output of amplitude limiting amplifier circuit 2, and output and shaping trigger I circuit 8 and join.Shaping triggers I circuit 8 to be made up of IC9 and R23, and the input of IC9 and the output of IC6 join, and input 7 pin of its output and CPU join.Integrated circuit (IC) 3 and resistance R 33, R34, diode D8-D11, capacitor C 20-C22, potentiometer RP1 form follower II circuit 6, the inverting input of IC3 links to each other with output, in-phase input end links to each other with sensor circuit 1, and its output also joins with display circuit 2.Integrated circuit (IC) 5 and resistance R 35-R37, R39-R42, capacitor C 23 are formed amplifier circuit 9, and the inverting input of IC5 links to each other with output by R42, and its in-phase input end joins by R36 and IC3 output, and its output and V/F translation circuit 10 join.IC15, resistance R 43-R47, capacitor C 24, C25, potentiometer RP3 form V/F translation circuit 10, the input of IC15 (7 pin) joins by the output of R44 and IC5,1,6 pin join the back by and the R43, the C24 ground connection that connect, 5 pin are by C25 ground connection and connect the C tie point of power circuit 18 by R45,2 pin are by R46, RP3 ground connection, and 3 pin are output termination CPU8 pin and the d tie point that connects power circuit 18 by R47.Reference circuit 12 is the secondary coil of power transformer T.Benchmark amplifying circuit 13 is made up of IC7 and R20, R21, the reversed-phase output of IC7 connects the end of L by R20 and joins by R21 and in-phase input end, in-phase input end also connects the other end of L and the C tie point of power circuit 18 respectively, and output links to each other with the input that shaping triggers II circuit 14.IC8 and R22 form shaping and trigger II circuit 14, and the input of IC8 links to each other with the output of IC7 by R22, and its output links to each other with 6 pin of CPU.Integrated circuit (IC) 10, crystal oscillator JT, capacitor C 26, C27 form cpu circuit 11,6,7,8,1,19 pin of IC10 are signal input end, triggering II circuit 14, shaping triggering I circuit 8, V/F translation circuit 10 and timer circuit 16 with shaping respectively joins, 9,16,17,18 pin are output, wherein 9 pin and executive circuit 17 join, 16,17,18 pin join with three inputs of condition indication circuit 15 respectively, JT in parallel and respectively by C26, C27 ground connection between 4,5 pin.Condition indication circuit 15 is made up of triode VT1-VT3, resistance R 51-R57, luminous tube LED1-LED4.The base stage of VT1-VT3 connects 18,17,16 pin of IC10 respectively by R51-R53, the collector electrode of VT1-VT3 is pressed the d tie point of power circuit 18 respectively by R54LED4, R55LED3, the R56LED2 of series connection, the equal ground connection of its emitter, emitter also by R57LED, connect the d tie point.Integrated circuit (IC) 14 and resistance R 50 are formed timer circuit 16.IC4 is a timer circuit, and 1,8 pin join, 3,4 pin ground connection, and 2 pin connect the d tie point of power circuit 18 and connect 6 pin by R50, and 6 pin also connect 19 pin of IC10,1 pin that 7 pin meet IC10.Triode VT4, relay J, diode D13, resistance R 58 are formed executive circuit 17, and the VT4 base stage is joined by 9 pin of R58 and IC10, grounded emitter, and collector electrode connects a tie point of power circuit 18 by J, the D13 of parallel connection.Display circuit 7 is made up of ammeter A, potentiometer RP2, resistance R 38, R32 and push-button switch AN, the output of the termination follower I circuit 4 of R32 wherein, and the other end is by AN ground connection; The output of RP2, R38, A series connection back one termination follower II circuit 6, the end of another termination L.Integrated circuit (IC) 11-IC13, transformer T, diode D1-D5, D14, resistance R 10, capacitor C 10-C18 form power circuit 18, wherein D1-D4 forms bridge rectifier, IC11-IC13 is three groups of integrated regulators, and the output voltage of together forming 4 different brackets with bridge rectifier is a, b, c, d interconnection point.

The effect of foregoing circuit 1 to 17 is respectively: sensor circuit 1 detects Lou, electric shock signal (the synthetic leakage of inspection, shock current); Amplitude limit amplifies 2 and amplifies leakage, electric shock signal; Adder 3 is carried out add operation with the output signal of amplitude limit amplifying signal and follower I; Follower I circuit 4 carries out impedance matching and feeds back in the summing amplifier; 5 pairs of limitation signals of amplifying circuit and transducing signal carry out difference and amplify; The signal of 6 pairs of amplifying circuits of shaping triggering I circuit, 5 outputs carries out shaping and forms the CPU triggering signal of specific pulsewidth; The impedance matching voluntarily after the computing that superposes of the output signal of follower II circuit 7 couples of follower I circuit 6 and sensor circuit 1; Display circuit 8 shows leakage, electric shock resultant current signal and can simulate the test of getting an electric shock; 9 couples of follower II of amplifier circuit and power supply signal compare and enlarge; The leakage that V/F translation circuit 10 will synthesize, electric shock signal carry out the voltage/frequency conversion and are transported to and make sampled signal among the CPU and use; Cpu circuit 11 is treated control signal and is carried out digital information processing; 12 pairs of AC signal of reference circuit take a sample (from the secondary sampling of T); Benchmark amplifies 13 pairs of sampled signals and dc power signal compares and enlarges stack to improve antijamming capability; Shaping triggers 14 pairs of benchmark amplifying signals of II circuit and carries out shaping, and forms the CPU triggering signal of specific pulsewidth; Condition indication circuit 15 shows the operating state of CPU; The antijamming capability that timer circuit 16 improves CPU promptly makes CPU reset by force when interference signal exists; The output signal of 17 couples of CPU of executive circuit is carried out work and is carried out.

The electric leakage electric protective device of present embodiment has solved leakage, electrical shock protection dead-time problem, the reliability height, and compact conformation, easy for installation.

In the present embodiment, IC1-IC7 is a LM324 type integrated amplifier, IC10 is an AT89C2051 type single chip circuit, IC11-IC13 is respectively 7815,7809,7805 type integrated stable voltage circuits, IC14 is a MAX813 type timer circuit, IC15 is a LM331 type V/F converter ic, and IC8, IC9 are that P521 type shaped pulse triggers integrated circuit.

Claims (4)

1; a kind of electric leakage electric protective device; comprise shell and control circuit; it is characterized in that being provided with in the control circuit cpu circuit (11); cpu circuit (11) output connects executive circuit (17); condition indication circuit (15); cpu circuit (11) reset terminal connects timer circuit (16); reference circuit (12) connects benchmark amplifying circuit (13) in regular turn; shaping triggers (II) circuit (14) back and links to each other with an input of cpu circuit (11); sensor circuit (1) connects amplitude limiting amplifier circuit (2) in regular turn; amplifying circuit (5); shaping triggers (I) circuit (8) back and links to each other with an input of cpu circuit (11); sensor circuit (1) also connects amplitude limiting amplifier circuit (2) in regular turn; adder circuit (3); follower (I) circuit (4); follower (II) circuit (6); amplifier circuit (9); V/F translation circuit (10) back links to each other with an input of cpu circuit (11), also comprises power circuit (18) in the control circuit.

2,, it is characterized in that also being provided with display circuit (7) between follower in the described control circuit (II) circuit (6) and the sensor circuit (1) according to the described electric leakage electric protective device of claim 1.

3; according to the described electric leakage electric protective device of claim 1; it is characterized in that sensor circuit (1) is a current transformer (L); amplitude limiting amplifier circuit (2); adder circuit (3); follower (II) circuit (6); follower (I) circuit (4); amplifier circuit (9); amplifying circuit (5); benchmark amplifying circuit (13) is made of operational amplifier integrated circuit (IC1)-(IC7) and peripheral circuit respectively; shaping triggers (I) circuit (8); shaping triggers (II) circuit (14) and triggers integrated circuit (IC9) by shaped pulse respectively; (IC8) constitute with peripheral circuit; V/F translation circuit (10) is made of integrated V/F change-over circuit (IC15) and peripheral circuit; cpu circuit (11) is made of single-chip microcomputer integrated circuit (IC10); timer circuit (16) is made of integrated timer circuit (IC14) and peripheral circuit; power circuit (18) is by transformer (T); three grades of integrated regulators (IC11)-(IC13) constitute with peripheral circuit; transformer (T) secondary coil in the power circuit (18) constitutes reference circuit (12); the triode that condition indication circuit (15) is connected by the cpu circuit output; the resistance that is connected with the triode output; luminous tube constitutes, and executive circuit (17) is by the triode that is connected with the cpu circuit output; the relay (J) that is connected with the triode output constitutes.

4,, it is characterized in that described display circuit (7) is made of ammeter (A), potentiometer and the button (AN) of serial connection according to the described electric leakage electric protective device of claim 2.

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