Summary of the invention
Technical problem to be solved by this invention be to provide a kind of test specification wide and performance is comparatively reliable and stable forThe modified checkout equipment of test RCCB.
For solving the problems of the technologies described above, the invention provides a kind of for testing the modified checkout equipment of RCCB,Comprise AC power circuit, DC power-supply circuit, phase generating circuit, ac leakage regulating circuit, phase place display circuit,Indicator light circuit and time detection circuit; AC power circuit have the first live wire end for forming load circuit and forForm the second live wire end of simulation loop of electric leakage, the first live wire end and the second live wire end are for inputting with the live wire of equipment under testEnd is connected, and the zero line side of described load circuit is for being connected with the zero line side of equipment under test; Described equipment under test is that A type leaksElectrical circuit breakers; Phase generating circuit is for being connected with the live wire output L2 of equipment under test; Phase generating circuit comprises controlButton circuit, control button circuit produces circuit for control phase and generates respectively current hysteresis at described simulation loop of electric leakageHalf of 135 ° of half-wave rectified current, electric current lagging voltages that half-wave rectified current, electric current lagging voltage that rear voltage is 0 ° are 90 °The half-wave rectified current of ripple rectified current and 0 ° of the electric current lagging voltage that contains 6mA direct current; Ac leakage regulating circuit is used forControl the size of current of described simulation loop of electric leakage; Time detection circuit is for measuring from the conducting of described simulation loop of electric leakage extremelyA type RCCB is threaded off required time, i.e. actuation time; Described phase generating circuit comprises: electric current lagging voltage135 ° of the second half-wave rectifying circuit, the electric current lagging voltages of 90 ° of the first half-wave rectifying circuit, the electric current lagging voltages of 0 °The 3rd half-wave rectifying circuit, 6mA direct current generative circuit and controllable silicon current control circuit, controllable silicon current control circuitFor believing according to the control of described the first half-wave rectifying circuit, the second half-wave rectifying circuit and the output of the 3rd half-wave rectifying circuitNumber in described simulation loop of electric leakage, generate respectively 90 ° of half-wave rectified current, the electric current lagging voltages of 0 ° of electric current lagging voltageThe half-wave rectified current of 135 ° of half-wave rectified current, electric current lagging voltages and 0 ° of the electric current lagging voltage that contains 6mA direct currentHalf-wave rectified current; The 3rd half-wave rectifying circuit that described electric current lagging voltage is 135 ° comprises: by transformer T2, two utmost pointsPipe D5, resistance R 3, R4, R5, R6, R7 and the sine wave shaped that operational amplifier IC1A forms become circuit, put with computingThe charging circuit being formed by resistance R 8, capacitor C 5 that the output of large device IC1A is connected, formed by diode D6, D7 withDoor; Be used for setting resistance R 9 and the R10 with respect to the voltage of adjusting of 135 ° of electric current lagging voltages, be used for regulating operation amplifierResistance R 11 and the potentiometer WR1 of the comparative voltage with respect to 135 ° of electric current lagging voltages of the backward end of device IC1B, computing is putThe output of large device IC1B is for the control signal of 135 ° of output current lagging voltages; Resistance R 12 is triode BG3 base stagesCurrent-limiting resistance, triode BG3 and resistance R 13 form emitter follower, the control that electric current lagging voltage in resistance R 13 is 135 °Signal processed is given triode BG18 by press button SB1, resistance R 58, and triode BG18 drives opto-coupler chip IC4, electricityResistance R59 is current-limiting resistance, ensures that opto-coupler chip IC4 effectively works; Opto-coupler chip IC4 is in order to isolate alternating current 220V and phase placeProduce circuit direct current component, control the turn-on and turn-off of bidirectional triode thyristor BG19, resistance R 60, R61 be used for controlling two-way canThe G utmost point input current of control silicon BG19, makes input signal enough trigger bidirectional triode thyristor BG19 conducting; Bidirectional triode thyristor BG19A, K bis-utmost points be connected between load and AC power, the electric current that flows through load is exactly that to lag behind the half-wave of 135 ° of voltages wholeStream electric current; Controlling bidirectional triode thyristor BG19 gets final product in control circuit by the residue pulsating current of regulation, regulator potentiometerWR3, WR4, WR5 can control leakage current; In the time that press button SB10 is closed, in two of press button SB10Between contact for the detection of phase generating circuit output waveform; Described controllable silicon current control circuit comprises: according to describedThe control signal of one half-wave rectifying circuit, the second half-wave rectifying circuit and the output of the 3rd half-wave rectifying circuit and three utmost points of conductingPipe BG18, the opto-coupler chip IC4 being driven by triode BG18, by the bidirectional triode thyristor BG19 of opto-coupler chip IC4 control break-make,The A of bidirectional triode thyristor BG19, the K utmost point are connected in described simulation loop of electric leakage; Described time detection circuit comprises: single-chip microcomputerIC6, be connected with the detection of electrical leakage end of single-chip microcomputer IC6 for detection of the whether electric leakage signal of conducting of described simulation loop of electric leakageTesting circuit and the charactron for displaying time being connected with the temporal information output of single-chip microcomputer IC6; Single-chip microcomputer IC6Measure from the conducting of described simulation loop of electric leakage to A type RCCB according to the electric leakage signal of leakaging signal detecting circuit outputThread off required time show this time by described charactron; Phase generating circuit comprises direct current generative circuit; DescribedDirect current generative circuit is made up of resistance R 67,9V dry cell Bt, press button SB5, SB6; One end of resistance R 67 and 9V are dryThe positive pole of battery U is connected, and the other end of resistance R 67 is connected with the intermediate contact of press button SB5, and press button SB5's is normalOpen contact and be connected with normally opened contact, the normally-closed contact of press button SB6,9V dry battery cathode connects often opening of press button SB6Contact, the intermediate contact of press button SB6 is connected with direct current output wiring terminal "+", the intermediate contact of press button SB6SB6-21 is connected with direct current output "-".
The present invention has positive effect: (1) the present invention, by improving direct current generative circuit, makes its structure comparatively reasonable,Can effectively meet the testing requirement of special RCCB.
Detailed description of the invention
(embodiment 1)
See Fig. 1-3, the present embodiment is a kind of for testing the modified checkout equipment of RCCB, comprising: alternating currentSource circuit 1, DC power-supply circuit 7, phase generating circuit 2, ac leakage regulating circuit 3, phase place display circuit 6, refer toIndication lamp circuit 5 and time detection circuit 4.
AC power circuit 1 has the first live wire end for forming load circuit and for forming simulation loop of electric leakageThe second live wire end, the first live wire end is used for being connected with the live wire input of equipment under test 9 with the second live wire end, described loadThe zero line side in loop is for being connected with the zero line side of equipment under test 9. In the present embodiment, equipment under test 9 is A type RCCBs.
Phase generating circuit 2 is for being connected with the live wire output L2 of equipment under test 9; Phase generating circuit 2 comprise control byButton circuit, control button circuit produces circuit 2 for control phase and generates respectively current hysteresis at described simulation loop of electric leakageHalf of 135 ° of half-wave rectified current, electric current lagging voltages that half-wave rectified current, electric current lagging voltage that rear voltage is 0 ° are 90 °The half-wave rectified current of ripple rectified current and 0 ° of the electric current lagging voltage that contains 6mA direct current.
Ac leakage regulating circuit 3 is for controlling the size of current of described simulation loop of electric leakage; Time detection circuit 4 forMeasure and thread off required time, i.e. actuation time from described simulation loop of electric leakage conducting to A type RCCB.
Described phase generating circuit 2 comprises: the first half-wave rectifying circuit, electric current lagging voltage that electric current lagging voltage is 0 °The 3rd half-wave rectifying circuit of 135 ° of the second half-wave rectifying circuit, the electric current lagging voltages of 90 °, 6mA direct current generative circuit,And for according to the control of described the first half-wave rectifying circuit, the second half-wave rectifying circuit and the output of the 3rd half-wave rectifying circuitSignal processed generates respectively half-wave rectified current, the electric current lagging voltage of 0 ° of electric current lagging voltage in described simulation loop of electric leakageElectricity after the half-wave rectified current of 135 ° of half-wave rectified current, the electric current lagging voltages of 90 ° and the current hysteresis that contains 6mA direct currentPress the controllable silicon current control circuit of the half-wave rectified current of 0 °.
The 3rd half-wave rectifying circuit that described electric current lagging voltage is 135 ° comprises: by transformer T2, diode D5, resistanceThe sine wave shaped that R3, R4, R5, R6, R7 and operational amplifier IC1A form becomes circuit, with operational amplifier IC1AOutput be connected the charging circuit being formed by resistance R 8, capacitor C 5, formed by diode D6, D7 with door; WithSet resistance R 9 and R10 with respect to the voltage of adjusting of 135 ° of electric current lagging voltages, be used for regulating operational amplifier IC1BResistance R 11 and the potentiometer WR1 of the comparative voltage with respect to 135 ° of electric current lagging voltages of backward end, operational amplifierThe output of IC1B is for the control signal of 135 ° of output current lagging voltages.
Resistance R 12 is current-limiting resistances of triode BG3 base stage, and triode BG3 and resistance R 13 form emitter follower,The control signal that electric current lagging voltage in resistance R 13 is 135 ° is given triode by press button SB1, resistance R 58BG18, triode BG18 drives opto-coupler chip IC4, and resistance R 59 is current-limiting resistances, ensures the effective work of opto-coupler chip IC4Do. Opto-coupler chip IC4, in order to isolate alternating current 220V and phase generating circuit direct current component, controls bidirectional triode thyristor BG19Turn-on and turn-off, resistance R 60, R61, for controlling the G utmost point input current of bidirectional triode thyristor BG19, make input signalEnough trigger bidirectional triode thyristor BG19 conducting. A, K bis-utmost points of bidirectional triode thyristor BG19 are connected on load and AC powerBetween, the electric current that flows through load is exactly the half-wave rectified current that lags behind 135 ° of voltages. Control bidirectional triode thyristor BG19In can control circuit, by the residue pulsating current of regulation, regulator potentiometer WR3, WR4, that WR5 can control leakage current be largeLittle.
In the time that press button SB10 is closed, two intermediate contacts of press button SB10 are for phase generating circuit output waveThe detection of shape.
Described controllable silicon current control circuit comprises: according to described the first half-wave rectifying circuit, the second half-wave rectifying circuit andThe control signal of the 3rd half-wave rectifying circuit output and the triode BG18 of conducting, the optocoupler core being driven by triode BG18Sheet IC4, by the bidirectional triode thyristor BG19 of opto-coupler chip IC4 control break-make, the A of bidirectional triode thyristor BG19, the series connection of the K utmost pointIn described simulation loop of electric leakage.
Described time detection circuit 4 comprises: single-chip microcomputer IC6, be connected with the detection of electrical leakage end of single-chip microcomputer IC6 for inspectionSurvey described simulation loop of electric leakage whether conducting leakaging signal detecting circuit and with the temporal information output of single-chip microcomputer IC6The charactron for displaying time that end is connected; Single-chip microcomputer IC6 surveys according to the electric leakage signal of leakaging signal detecting circuit outputAmount is threaded off the required time from described simulation loop of electric leakage conducting to A type RCCB also should by described charactron demonstrationTime.
Described phase generating circuit 2 is connected with for showing that described simulation loop of electric leakage exists half of 0 ° of electric current lagging voltageThe half-wave rectified current that the half-wave rectified current that ripple rectified current or electric current lagging voltage are 90 ° or electric current lagging voltage are 135 ° orThe phase place display circuit 6 of the half-wave rectified current of 0 ° of the electric current lagging voltage that contains 6mA direct current.
AC power circuit by 220V50Hz ac power supply to transformer T4, transformer T4 output 180V, 220V,250V, 380V voltage are connected to and exchange on output wiring terminal L1, N through band switch SA1. Pass through adjusting band switchThe gear of SA1, can change the voltage that exchanges output wiring terminal L1 and N two ends. The load of transformer T4 is ac leakageRegulating circuit 3.
Ac leakage regulating circuit 3 is by transformer T4 output 26V alternating current, its output one end and band switch SA2After series connection, be connected to and exchange output wiring terminal L1, the other end and ammeter, the regulating resistance that leaks electricity, bidirectional triode thyristor BG19,After band switch SA3 series connection, be connected to and exchange output wiring terminal L2.
The logic that phase place display circuit 6 is made up of charactron LED1-LED4, diode D11-36, triode BG7-16Circuit, press button composition.
In the time pressing the button switch S B4, current signal trigger triode BG20 conducting, triode BG20 output signal is touchedSend out triode BG7, BG8 conducting, charactron LED1 shows " A ", and charactron LED2 shows " C ". Press the buttonWhen switch S B3, charactron LED1, LED4 show " A0 "; Press the button switch S B2, charactron LED1, LED3,LED4 shows " A90 "; Press the button switch S B5, charactron LED1, LED2, LED3, LED4 show " A0-6 ".
Indicator light circuit 5 is by transformer T4, commutation diode D42-45, three terminal regulator BG27, RC filter circuit groupBecome. DC power-supply circuit 7 comprises: the 5V DC power-supply circuit of being powered by transformer T1, powered by transformer T35V DC power-supply circuit, 12V DC power-supply circuit, 6mA direct current generative circuit.
Time detection circuit 4 by press button, commutation diode D46-49, triode BG23-26, resistance, capacitor C 15,The compositions such as photoelectrical coupler IC5, single-chip microcomputer IC6, charactron LED11.
6mA direct current generative circuit is made up of resistance R 67,9V dry cell Bt, press button SB5, SB6. Resistance R 67One end be connected with the positive pole of 9V dry cell U, the other end of resistance R 67 is connected with the intermediate contact of press button SB5,The normally opened contact of press button SB5 is connected with normally opened contact, the normally-closed contact of press button SB6, and 9V dry battery cathode connectsNormally opened contact, the normally opened contact of press button SB6 are connected, the intermediate contact of press button SB6 and direct current output wiring terminal"+" is connected, and the intermediate contact SB6-21 of press button SB6 is connected with direct current output "-".
The second half-wave rectifying circuit that electric current lagging voltage is 90 ° by resistance R 17, R18, R19, R20, R21, R22, R23,R24, R25, R26, R27, R57, R58, R59, R60, R61, capacitor C 6, diode D8, D9, D10, threeUtmost point pipe BG5, BG18, bidirectional triode thyristor BG19, operational amplifier IC2, opto-coupler chip IC4, potentiometer WR2 forms.
The first half-wave rectifying circuit that electric current lagging voltage is 0 ° by resistance R 50, R51, R52, R53, R54, R55, R56,R57, R58, R59, R60, R61, diode D37, triode BG17, BG18, bidirectional triode thyristor BG19, computingAmplifier IC3, opto-coupler chip IC4 forms. Triode BG22 in the positive terminal of diode D51 and phase place display circuitE extremely connected, the negative pole end of diode D51 is connected with one end of resistance R 75, the other end of resistance R 75 and triodeThe b of BG28 is extremely connected, and 2 pin of opto-coupler chip IC7 are extremely connected with the c of triode BG28, the e of triode BG28The utmost point is connected with 2 pin of voltage-stabiliser tube BG21. One end of resistance R 74 is connected with 3 pin of voltage-stabiliser tube BG21, opto-coupler chip IC74,6 pin be connected with press button SB3 intermediate contact SB3-21, normally opened contact SB3-22 respectively. Because of " remaining of regulationRemaining pulsating current " in have the half-wave rectified current that contains 6mA direct current of 0 ° of electric current lagging voltage, therefore this part is to be reality, in the situation of " A0-6 ", ensure the output of the half-wave rectified current of 0 ° of electric current lagging voltage now.
Resistance R 73, R77 are the current-limiting resistance of opto-coupler chip IC5, and resistance R 78 is the current limliting of 1 pin of single-chip microcomputer IC6Resistance, capacitor C 15, resistance R 79 form differential circuit, resistance R 80, R81, R82, R83, R84, R85, R86,R87 is the current-limiting resistance of the each pin of charactron LED11, resistance R 88, R89, R90, R91 be triode BG23, BG24,The current-limiting resistance of the b utmost point of BG25, BG26. Press button SB17 is testing button, and press button SB18 is SR.
In the time that press button SB17 is closed, breaker electrifying, DC current forms a spike through differential circuit, defeated1 pin that enters single-chip microcomputer IC6, single-chip microcomputer IC6 starts timing. In the time of circuit breaker trip, opto-coupler chip IC5 dead electricity, its4,6 pin turn-off, and 3 pin of single-chip microcomputer IC6 have high level input, and single-chip microcomputer IC6 stops timing and exports data to digitalPipe LED11 shows. In the time that press button SB18 presses, single-chip microcomputer IC6, charactron LED11 zero clearing.
Above-described embodiment is only for example of the present invention is clearly described, and is not to embodiments of the present inventionRestriction. For those of ordinary skill in the field, can also make on the basis of the above description other differenceThe variation of form or variation. Here without also giving exhaustive to all embodiments. And these belong to of the present inventionThe apparent variation that spirit is extended out or variation are still among protection scope of the present invention.