CN204992525U - Undervoltage protection circuit of delaying of switch electrical apparatus - Google Patents

Undervoltage protection circuit of delaying of switch electrical apparatus Download PDF

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Publication number
CN204992525U
CN204992525U CN201520682847.2U CN201520682847U CN204992525U CN 204992525 U CN204992525 U CN 204992525U CN 201520682847 U CN201520682847 U CN 201520682847U CN 204992525 U CN204992525 U CN 204992525U
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voltage
circuit
under
resistance
time delay
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杨奎
章金土
涂兵
刘瑾
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Zhejiang Chint Electrics Co Ltd
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Zhejiang Chint Electrics Co Ltd
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Abstract

Undervoltage protection circuit of delaying of switch electrical apparatus, including the surge snubber circuit who is coupled in proper order, half -wave rectifier circuit, detection circuitry, trigger buffer circuit and implementation of circuit, detection circuitry includes by two divider resistance from rectifier circuit's DC output sample and the voltage detecting delay circuit that crosses who charges and constitute an electric capacity, when the sample result is greater than its excessive pressure setting value, this circuit has excessive pressure time delay process and could export excessive pressure control signal to the buffer circuit that triggers who is coupled after excessive pressure time delay process. Still including owing voltage detecting delay circuit, the projecting pole of its triode obtains reference voltage from DC output, and the base of this triode is through two divider resistance from DC output sample, and when the sample result was less than under -voltage setting value, this triode switched on, owes that voltage detecting delay circuit has under -voltage time delay process and could trigger buffer circuit and export under -voltage control signal to what be coupled after under -voltage time delay process. Simple structure is with low costs.

Description

Device for switching can time delay over under-voltage protection circuit
Technical field
The utility model belongs to Low Voltage Electrical Apparatus, is specifically related to a kind of electronic circuit of device for switching, particularly to voltage detecting, there is the overvoltage protection of delay function and the circuit of under voltage protection.
Background technology
Because the instability of line voltage or people are the reasons such as the wiring error (as 380V voltage is applied on 230V circuit) caused; the voltage of the mains side of circuit breaker usually there will be the abnormal conditions of overvoltage (exceeding the rated voltage of circuit breaker) or under voltage (rated voltage lower than circuit breaker), and these abnormal conditions often cause the problem of the power consumption equipment burning circuit breaker lower end electricity consumption load-side.People are in the urgent need to a kind of overvoltage and under voltage (being called for short " overvoltage/undervoltage ") protective circuit for this reason; when there is overvoltage or under voltage in the voltage of mains side; threaded off by this over under-voltage protection circuit auto-controlled circuit breaker and trip and output of cutting off the electricity supply, thus prevent overvoltage/undervoltage from causing adverse consequences to circuit breaker lower end electricity consumption load-side.
The overvoltage that device for switching traditional at present adopts, under-voltage protecting circuit, mainly comprise three major types: one is only have overvoltage protection, does not have the protection such as under-voltage protection and surge, and defencive function is incomplete.Although two is adopt overvoltage/undervoltage full protection circuit, but circuit structure is complicated, not only manufacturing cost is high, be difficult to be applicable to miniature circuit breaker, and due to using same resistance both as superpotential detecting element also as a part for the detecting element of under voltage, in production process, overvoltage and under voltage debugging influence each other, and qualification rate is lower; Moreover, only utilize piezo-resistance to absorb surge voltage, need to adopt the piezo-resistance that volume is large, cost is high.Three is circuit working shortcoming stability, reliabilities.The destructiveness of known overvoltage or under voltage acts on load equipment time length with it is closely related, but overvoltage or the under voltage as being shorter than 0.3 second of moment, destructiveness for conventional load equipment is very little, even can ignore, when the common transient overvoltage that do not constitute a threat to load equipment or under voltage appear in supply voltage, make over under-voltage protection circuit work unreliable, unnecessary dropout misoperation may be caused, have a strong impact on normal electricity consumption, and the most of fluctuation belonging to moment in fluctuating of the overvoltage of electrical network or under voltage, therefore, if can trip by the reasonably avoiding false tripping that overvoltage/undervoltage causes instantaneously, for guaranteeing that normal electricity consumption order is very necessary and useful, and existing over under-voltage protection circuit does not all consider this safety measure.Although at present the existing circuit adopting filter capacitor, can only filter out the interference of high order harmonic component to circuit, but it effectively can not improve the problem of the unnecessary dropout of circuit breaker caused because of transient overvoltage or under voltage.
Utility model content
Technical problem to be solved in the utility model is to provide that a kind of circuit is simple, cost is low, antijamming capability is strong, there is the device for switching of certain time-delay function can time delay over under-voltage protection circuit.
The technical scheme that the utility model is adopted for achieving the above object is:
A kind of device for switching can time delay over under-voltage protection circuit, comprise the surge absorbing circuit coupled successively, half-wave rectifying circuit, testing circuit, trigger buffer circuit and executive circuit, it is characterized in that, described testing circuit comprises: Zenith tracking delay circuit and under voltage detect delay circuit, Zenith tracking delay circuit is sampled by two divider resistances from the DC output end of half-wave rectifying circuit and carries out charging to an electric capacity and forms, when sampling result is greater than its overvoltage set point, described Zenith tracking delay circuit has overvoltage time delay process, and could to coupled triggering buffer circuit output overvoltage control signal after overvoltage time delay process terminates, make triggering buffer circuit control executive circuit and perform trip action.Under voltage detects delay circuit, the emitter of its triode Q1 obtains reference voltage from the DC output end of half-wave rectifying circuit, the base stage of this triode Q1 samples through the DC output end of two divider resistances from half-wave rectifying circuit, when sampling result is less than under-voltage set point, this triode Q1 conducting, described under voltage detects delay circuit and has under-voltage time delay process, and under-voltage control signal could be exported to coupled triggering buffer circuit after under-voltage time delay process terminates, make triggering buffer circuit control executive circuit and perform trip action.
Described half-wave rectifying circuit comprises rectifier diode VD1, the ac input end be just very connected with the electromagnetic type tripping coil KA of executive circuit of rectifier diode VD1, AC power carries out halfwave rectifier by diode VD1 again through described electromagnetic type tripping coil KA; The negative pole of rectifier diode VD1 is DC output end, and this DC output end is used for providing DC power supply simultaneously for circuit provides sampling voltage for circuit.
Further: described surge absorbing circuit comprises the current-limiting inductor KA1 of piezo-resistance RV1 and electromagnetic type tripping coil KA, one end of current-limiting inductor KA1 is connected with the live wire phase L of AC power, the other end of current-limiting inductor KA1 is connected with one end of piezo-resistance RV1, and the other end of piezo-resistance RV1 is connected with the neutral phase N of AC power.Above-mentioned electromagnetic type tripping coil KA comprises current-limiting inductor KA1 and coil KA2, trip action is performed for described in executive circuit, current-limiting inductor KA1 is for absorbing moment surge voltage simultaneously, described one end of coil KA2 is connected with the ac input end of half-wave rectifying circuit, and one end of the other end of coil KA2 and the piezo-resistance RV1 of surge absorbing circuit is connected in parallel.
Be provided with overvoltage delay capacitor C1 in described Zenith tracking delay circuit, described overvoltage time delay process was formed by the charging interval of overvoltage delay capacitor C1; The voltage that described overvoltage time delay process terminates the DC output end referring to described half-wave rectifying circuit is be more than or equal to the state in the charging interval of described overvoltage delay capacitor C1 higher than duration of overvoltage set point.
Further: the one end of divider resistance R1 in described Zenith tracking delay circuit is connected with the DC output end of half-wave rectifying circuit, one end of divider resistance R2, one end of overvoltage delay capacitor C1 and earth polar are connected in parallel, and the other end of the other end of divider resistance R1, the other end of divider resistance R2, delay capacitor C1 is connected in parallel with the overvoltage control input end of triggering buffer circuit.
Described under voltage detects in delay circuit and is provided with under-voltage delay capacitor C3, and described under-voltage time delay process was formed by the charging interval of under-voltage delay capacitor C3; The voltage that described under-voltage time delay process terminates the DC output end referring to described half-wave rectifying circuit is be more than or equal to the state in the charging interval of described under-voltage delay capacitor C3 lower than duration of under-voltage set point.Further: above-mentioned under voltage detects delay circuit and also comprises resistance R3, resistance R4, resistance R5, resistance R7, resistance R8, voltage-stabiliser tube VZ1, with electric capacity C2, wherein one end of resistance R3, one end of resistance R4 and the DC output end of half-wave rectifying circuit are connected in parallel, the E pole of triode Q1, the negative pole of voltage-stabiliser tube VZ1, one end of electric capacity C2 and the other end of resistance R3 are connected in parallel, the B pole of triode Q1 is connected with one end of resistance R7, the C pole of triode Q1 is connected with one end of resistance R8, the other end of resistance R8, one end of under-voltage delay capacitor C3 is connected in parallel with the under-voltage control input end of triggering buffer circuit, the other end of under-voltage delay capacitor C3, the positive pole of voltage-stabiliser tube VZ1, one end and the earth polar of resistance R5 are connected in parallel, the other end of electric capacity C2, the other end of resistance R4, the other end of resistance R5 and the other end of resistance R7 are connected in parallel.
Described triggering buffer circuit comprises voltage-stabiliser tube VZ2 and diode VD2, the negative pole of voltage-stabiliser tube VZ2 is overvoltage control input end, the just very under-voltage control input end of diode VD2, the dropout control input end of the positive pole of voltage-stabiliser tube VZ2 and the negative pole of diode VD2 and described executive circuit is connected in parallel.
Described executive circuit comprises electromagnetic type tripping coil KA, controllable silicon SCR and electric capacity C4, described electromagnetic type tripping coil KA is connected in series between the live wire phase L of AC power and the ac input end of half-wave rectifying circuit, the control pole of controllable silicon SCR and one end of electric capacity C4 are connected in parallel and form dropout control input end, the anode of controllable silicon SCR is connected with the DC output end of half-wave rectifying circuit, and the negative electrode of controllable silicon SCR, the other end of electric capacity C4 and earth polar are connected in parallel.
The utility model has the advantage of; it adopts simple circuit structure; not only achieve the function that overvoltage protection, under voltage protection and antisurge impact; but also extend the function that overvoltage detects time delay, under-voltage detection time delay; thus effectively can avoid the unnecessary dropout that transient overvoltage causes with moment under voltage; the General Promotion safety and reliability of trip action, improves the serviceability of circuit breaker.The over under-voltage protection circuit of circuit breaker of the present invention also efficiently solves that overvoltage protection that existing product circuit all exists, under voltage protection debugging difficulty are high, the problem of poor anti jamming capability, and can the Miniaturization Design of optimizing product and low cost manufacture further.
Accompanying drawing explanation
Fig. 1 be device for switching of the present utility model can the structured flowchart of time delay over under-voltage protection circuit.
Fig. 2 be device for switching of the present utility model can the electrical block diagram of a time delay over under-voltage protection circuit embodiment.
Embodiment
Below in conjunction with the embodiment that attached Fig. 1 and 2 provides, what further illustrate device for switching of the present utility model can the embodiment of time delay over under-voltage protection circuit.
See Fig. 1, 2, a kind of for the device for switching such as circuit breaker with the use of can time delay over under-voltage protection circuit, comprise the surge absorbing circuit coupled successively, half-wave rectifying circuit, testing circuit, trigger buffer circuit and executive circuit, described testing circuit further comprises: Zenith tracking delay circuit and under voltage detect delay circuit, Zenith tracking delay circuit is sampled by two divider resistances from the DC output end of half-wave rectifying circuit and carries out charging to an electric capacity and forms, when sampling result is greater than its overvoltage set point, described Zenith tracking delay circuit has overvoltage time delay process, and could to coupled triggering buffer circuit output overvoltage control signal after overvoltage time delay process terminates, make triggering buffer circuit control executive circuit and perform trip action.Under voltage detects delay circuit, the emitter of its triode Q1 obtains reference voltage from the DC output end of half-wave rectifying circuit, the base stage of this triode Q1 samples through the DC output end of two divider resistances from half-wave rectifying circuit, when sampling result is less than under-voltage set point, this triode Q1 conducting, described under voltage detects delay circuit and has under-voltage time delay process, and under-voltage control signal could be exported to coupled triggering buffer circuit after under-voltage time delay process terminates, make triggering buffer circuit control executive circuit and perform trip action.
In the embodiment of fig. 2, described rectification circuit is half-wave rectifying circuit, it comprises rectifier diode VD1, as everyone knows, described circuit breaker (not shown) has mains side and load-side, two inputs of mains side are connected with the live wire phase L in electrical network, neutral line N respectively, the live wire phase L of load-side, neutral line N electricity supply and use equipment (load equipment) access.Described half-wave rectifying circuit has an ac input end and a DC output end, the ac input end be just very connected with the electromagnetic type tripping coil KA of surge absorbing circuit of rectifier diode VD1, described surge absorbing circuit is connected between the live wire phase L of AC power and neutral line N, AC power gets alternating current through described electromagnetic type tripping coil KA from live wire phase L, then carries out halfwave rectifier by diode VD1; The negative pole of rectifier diode VD1 is DC output end, and DC output end is the direct current output cathode of half-wave rectifying circuit, and the direct current output negative pole of half-wave rectifying circuit is connected with neutral line N, forms public earth polar.Specifically, surge absorbing circuit is made up of the current-limiting inductor KA1 of the electromagnetic type tripping coil KA of two-part and piezo-resistance RV1, one end of current-limiting inductor KA1 is connected with the live wire phase L of AC power, the other end of current-limiting inductor KA1 is connected with one end of piezo-resistance RV1, and the other end of piezo-resistance RV1 is connected with the neutral phase N of AC power.The electromagnetic type tripping coil KA of described executive circuit comprises current-limiting inductor KA1 and coil KA2, one end of current-limiting inductor KA1 is connected with the live wire phase L of AC power, one end of coil KA2 is connected with the ac input end of half-wave rectifying circuit, one end of the other end of current-limiting inductor KA1, the other end of coil KA2 and the piezo-resistance RV1 of surge absorbing circuit is connected in parallel, and the other end of piezo-resistance RV1 is connected with the neutral phase N of AC power.The just very ac input end of rectifier diode VD1, this input is connected with one end of the electromagnetic type tripping coil KA of executive circuit, and the other end of electromagnetic type tripping coil KA is connected with live wire phase L, to get alternating current from live wire phase L.The negative pole of rectifier diode VD1 is DC output end, because the fluctuation of the direct voltage (voltage to earth polar) of DC output end is consistent with the fluctuation of the alternating voltage (voltage of centering line N) of ac input end.Therefore, DC output end of the present utility model not only for providing DC power supply for circuit, but also is used as the sampling node of overvoltage or under voltage.The advantage adopting above-mentioned half-wave rectifying circuit to form surge absorbing circuit structure in conjunction with the current-limiting inductor KA1 in the electromagnetic type tripping coil KA of executive circuit is: because surge is first absorbed by piezo-resistance RV1 after the buffering of current-limiting inductor KA1 again, therefore the impact suffered by piezo-resistance RV1 is substantially reduced, not only effectively can improve the ability of surge absorbing circuit, but also energy grade and the volume of piezo-resistance RV1 can be effectively reduced, be conducive to the miniaturization of product; Because surge is only through current-limiting inductor KA1, and without the coil KA2 in electromagnetic type tripping coil KA, the trip action that therefore can effectively prevent surge from causing, is conducive to improving the serviceability guaranteeing normal power supply.Simultaneously, rectifier diode VD1 not only has rectification function, also there is the function (direct voltage of DC output end is about 0.45 times of the alternating voltage of ac input end) reducing VD, therefore dropping resistor can be omitted, not only be conducive to reducing volume, reducing costs, but also be conducive to reducing temperature rise.
Described executive circuit comprises electromagnetic type tripping coil KA, controllable silicon SCR and electric capacity C4, electromagnetic type tripping coil KA is connected in series between the live wire phase L of AC power and the ac input end of half-wave rectifying circuit, the control pole of controllable silicon SCR and one end of electric capacity C4 are connected in parallel and form dropout control input end, the anode of controllable silicon SCR is connected with the DC output end of half-wave rectifying circuit, and the negative electrode of controllable silicon SCR, the other end of electric capacity C4 and earth polar are connected in parallel.When Zenith tracking delay circuit or under voltage detect delay circuit after triggering buffer circuit and exporting triggering signal, trigger controllable silicon SCR, controllable silicon SCR conducting, make electromagnetic type tripping coil KA action, electric capacity C4 plays Anti-Jamming.The advantage of the executive circuit of said structure is adopted to be that structure is simple, particularly adopt the electromagnetic type tripping coil KA having tripping function and surge absoption function concurrently, effectively can not only reduce the usage quantity of electronic component, and effectively can also guarantee and improve Interruption and surge absoption performance.
Of the present utility modelly the testing circuit of time delay over under-voltage protection circuit can comprise Zenith tracking delay circuit, it samples from the DC output end of half-wave rectifying circuit, and when sampling result is greater than overvoltage set point to buffer circuit output overvoltage control signal.Be provided with overvoltage delay capacitor C1 in described Zenith tracking delay circuit, described overvoltage time delay process was formed by the charging interval of overvoltage delay capacitor C1; When the voltage of DC output end is more than or equal to the charging interval of overvoltage delay capacitor C1 higher than duration of overvoltage set point, Zenith tracking delay circuit could output overvoltage control signal, otherwise can not output overvoltage control signal.The concrete structure of Zenith tracking delay circuit can have multiple, a kind of preferred structure as shown in Figure 2, described Zenith tracking delay circuit comprises divider resistance R1, divider resistance R2 and overvoltage delay capacitor C1, one end of divider resistance R1 is connected with the DC output end of half-wave rectifying circuit, one end of divider resistance R2, one end of overvoltage delay capacitor C1 and earth polar are connected in parallel, and the other end of the other end of divider resistance R1, the other end of divider resistance R2, overvoltage delay capacitor C1 is connected in parallel with the overvoltage control input end of triggering buffer circuit.
Zenith tracking delay circuit operation principle is as follows: grid alternating current source, after halfwave rectifier, is carried out dividing potential drop by resistance R1, resistance R2, and charged to electric capacity C1.When line voltage is greater than setting voltage, electric capacity C1 is after the charging of certain hour, and voltage is elevated to the voltage stabilizing value being greater than voltage-stabiliser tube VZ2, voltage-stabiliser tube conducting, forms triggering signal.Detailed process is: when the voltage (i.e. sampling result) of the DC output end (i.e. one end of divider resistance R1) of half-wave rectifying circuit is less than or equal to overvoltage set point, the voltage of the other end of divider resistance R1 is less than the voltage stabilizing value of the voltage-stabiliser tube VZ2 triggering buffer circuit, voltage-stabiliser tube VZ2 not conducting, therefore Zenith tracking delay circuit can not to buffer circuit output voltage signal; When the voltage of the DC output end of half-wave rectifying circuit is greater than overvoltage set point, the other end of divider resistance R1 first charges (namely entering time delay process) to overvoltage delay capacitor C1, recharge here in time delay process, the voltage of the other end of divider resistance R1 is less than the voltage stabilizing value of the voltage-stabiliser tube VZ2 triggering buffer circuit all the time, voltage-stabiliser tube VZ2 not conducting, therefore Zenith tracking delay circuit can not to buffer circuit output voltage signal; In described charging time delay process, if the voltage resume of the DC output end of half-wave rectifying circuit is to being less than or equal to overvoltage set point, then because the voltage of the other end of divider resistance R1 remains on the state of the voltage stabilizing value being less than the voltage-stabiliser tube VZ2 triggering buffer circuit, namely the state of voltage-stabiliser tube VZ2 not conducting is remained on, so Zenith tracking delay circuit still can not to buffer circuit output voltage signal; If after described charging time delay process terminates, the voltage (i.e. sampling result) of the DC output end of half-wave rectifying circuit remains at and is greater than overvoltage set point, then the voltage of the other end of divider resistance R1 is increased to the voltage stabilizing value of voltage-stabiliser tube VZ2, voltage-stabiliser tube VZ2 conducting, only have in this case, Zenith tracking delay circuit could to triggering buffer circuit output voltage signal, namely trigger controllable silicon SCR conducting, cause the electromagnetic type tripping coil KA of executive circuit to perform trip action.
Of the present utility modelly the testing circuit of time delay over under-voltage protection circuit also can to comprise under voltage and detect delay circuit; it samples from the DC output end of half-wave rectifying circuit; when sampling result is less than under-voltage set point; described under voltage detects delay circuit and is introduced into under-voltage time delay process, and could export under-voltage control signal to buffer circuit after under-voltage time delay process terminates.Described under voltage detects in delay circuit and is provided with under-voltage delay capacitor C3, and described under-voltage time delay process was formed by the charging interval of under-voltage delay capacitor C3; When the voltage of DC output end is more than or equal to the charging interval of under-voltage delay capacitor C3 lower than duration of under-voltage set point, under voltage detects delay circuit could export under-voltage control signal, otherwise can not export under-voltage control signal.The concrete structure that under voltage detects delay circuit can have multiple, and as shown in Figure 2, described under voltage detects delay circuit and comprises resistance R3 a kind of preferred structure, resistance R4, resistance R5, resistance R7, resistance R8, voltage-stabiliser tube VZ1, triode Q1, electric capacity C2 and under-voltage delay capacitor C3, one end of resistance R3, one end of resistance R4 and the DC output end of half-wave rectifying circuit are connected in parallel, the E pole (emitter) of triode Q1, the negative pole of voltage-stabiliser tube VZ1, one end of electric capacity C2 and the other end of resistance R3 are connected in parallel, and the B pole (base stage) of triode Q1 is connected with one end of resistance R7, and the C pole (collector electrode) of triode Q1 is connected with one end of resistance R8, the other end of resistance R8, one end of under-voltage delay capacitor C3 is connected in parallel with the under-voltage control input end of triggering buffer circuit, the other end of under-voltage delay capacitor C3, the positive pole of voltage-stabiliser tube VZ1, one end and the earth polar of resistance R5 are connected in parallel, the other end of electric capacity C2, the other end of resistance R4, the other end of resistance R5 and the other end of resistance R7 are connected in parallel.
The operation principle that under voltage detects delay circuit is as follows: grid alternating current source, after halfwave rectifier, through resistance R3, voltage-stabiliser tube VZ1, provides a reference voltage to the emitter of triode Q1; Grid alternating current source, after halfwave rectifier, through resistance R4, resistance R5 dividing potential drop, provides a control voltage to the base stage of triode Q1.When line voltage is lower than set point, the control voltage of the base stage of triode Q1 is lower than the reference voltage of the emitter of triode Q1, triode Q1 conducting, reference voltage charges to electric capacity C3 through triode Q1, resistance R8, after the charging of certain hour, after voltage is elevated to set point, form triggering signal through diode VD2.Detailed process is: the direct voltage of the DC output end of half-wave rectifying circuit, after resistance R3 and voltage-stabiliser tube VZ1, provides reference voltage to the E pole of triode Q1, and this reference voltage is modulated by the voltage stabilizing value of voltage-stabiliser tube VZ1; Triode Q1 adopts PNP pipe, the direct voltage of the DC output end of half-wave rectifying circuit is loaded into the B pole of triode Q1 after resistance R4, control voltage node (node be namely connected in parallel by the other end of the other end of electric capacity C2, the other end of resistance R4, the other end of resistance R5 and resistance R7), resistance R7, when the direct voltage of DC output end is greater than under-voltage set point, the B pole tension of triode Q1 is higher than reference voltage, triode Q1 ends, the other end Non voltage output of resistance R8; When the direct voltage of DC output end is less than under-voltage set point, the B pole tension of triode Q1 is lower than reference voltage, triode Q1 conducting, the other end of resistance R8 first charges (namely entering time delay process) to under-voltage delay capacitor C3, and the charging of under-voltage delay capacitor C3 makes under-voltage control signal can not export to triggering buffer circuit; In described charging time delay process, if the voltage resume of the DC output end of half-wave rectifying circuit is to being greater than and equaling under-voltage set point, then triode Q1 is converted to cut-off by conducting, and the other end of resistance R8 is converted to Non voltage output thereupon; If in described charging time delay process and until after this process terminates, the voltage (i.e. sampling result) of the DC output end of half-wave rectifying circuit remains at and is less than under-voltage set point, then the voltage of the other end of resistance R8 with the end of charging time delay process voltage rise high and form under-voltage control signal, control signal that this is under-voltage exports to the under-voltage control input end of triggering buffer circuit, and trigger controllable silicon SCR conducting, cause electromagnetic type tripping coil KA to perform dropout dynamic.
The utility model due to adopt above-mentioned can the testing circuit of time delay over under-voltage protection circuit; it has an advantage be highly profitable: trigger buffer circuit and can perform trip action according to the under-voltage control signal control executive circuit of the overvoltage control signal of Zenith tracking delay circuit input or the input of under voltage detection delay circuit; and; when line voltage is higher than set point; Zenith tracking delay circuit exports triggering signal; voltage-stabiliser tube VZ2 conducting; but diode VD2 oppositely ends, do not detect the impact of delay circuit by under voltage.When line voltage is lower than set point, under voltage detects delay circuit and exports triggering signal, but triggering signal is less than the branch pressure voltage of resistance R1 and resistance R2, voltage-stabiliser tube VZ2 not conducting, not by the impact of Zenith tracking delay circuit.The concrete structure of triggering buffer circuit of the present utility model can have multiple, a kind of preferred structure as shown in Figure 2, described triggering buffer circuit comprises voltage-stabiliser tube VZ2 and diode VD2, the negative pole of voltage-stabiliser tube VZ2 is overvoltage control input end, the just very under-voltage control input end of diode VD2, the dropout control input end of the positive pole of voltage-stabiliser tube VZ2 and the negative pole of diode VD2 and executive circuit is connected in parallel.Owing to triggering buffer circuit, there is (that is: the under-voltage control input end be made up of the positive pole of diode VD2, two control input ends, the overvoltage control input end be made up of the positive pole of diode VD2) and control output node (node that the positive pole of voltage-stabiliser tube VZ2 and the negative pole of diode VD2 are connected in parallel), so the overvoltage control signal of Zenith tracking delay circuit output and under voltage can be detected the under-voltage control signal parallel output of delay circuit output to the dropout control input end of executive circuit (i.e. the control pole of controllable silicon SCR) by it, that is, the under-voltage control signal that the overvoltage control signal that described triggering buffer circuit inputs according to Zenith tracking delay circuit or under voltage detect delay circuit input controls executive circuit and performs trip action, achieve overvoltage control signal and under-voltage control signal walks abreast and do not interfere with each other the trip action controlling executive circuit, and circuit is very simple, reliably, be conducive to miniaturization and the low cost of product.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection range of the present utility model.

Claims (10)

1. device for switching can a time delay over under-voltage protection circuit, comprise the surge absorbing circuit, half-wave rectifying circuit, testing circuit, triggering buffer circuit and the executive circuit that couple successively, it is characterized in that, described testing circuit comprises:
Zenith tracking delay circuit, sampled by two divider resistances from the DC output end of half-wave rectifying circuit and charging is carried out to an electric capacity and form, when sampling result is greater than its overvoltage set point, described Zenith tracking delay circuit has overvoltage time delay process, and to coupled triggering buffer circuit output overvoltage control signal, triggering buffer circuit could be made to control executive circuit and perform trip action after overvoltage time delay process terminates;
Under voltage detects delay circuit, the emitter of its triode Q1 obtains reference voltage from the DC output end of half-wave rectifying circuit, the base stage of this triode Q1 samples through the DC output end of two divider resistances from half-wave rectifying circuit, when sampling result is less than under-voltage set point, this triode Q1 conducting, described under voltage detects delay circuit and has under-voltage time delay process, and under-voltage control signal could be exported to coupled triggering buffer circuit after under-voltage time delay process terminates, make triggering buffer circuit control executive circuit and perform trip action.
2. device for switching according to claim 1 can time delay over under-voltage protection circuit, it is characterized in that: described half-wave rectifying circuit comprises rectifier diode VD1, the ac input end be just very connected with the electromagnetic type tripping coil KA of executive circuit of rectifier diode VD1, AC power carries out halfwave rectifier by diode VD1 again through described electromagnetic type tripping coil KA; The negative pole of rectifier diode VD1 is DC output end, and this DC output end is used for providing DC power supply simultaneously for circuit provides sampling voltage for circuit.
3. device for switching according to claim 1 can time delay over under-voltage protection circuit; it is characterized in that: described surge absorbing circuit comprises the current-limiting inductor KA1 of piezo-resistance RV1 and electromagnetic type tripping coil KA; one end of current-limiting inductor KA1 is connected with the live wire phase L of AC power; the other end of current-limiting inductor KA1 is connected with one end of piezo-resistance RV1, and the other end of piezo-resistance RV1 is connected with the neutral phase N of AC power.
4. device for switching according to claim 3 can time delay over under-voltage protection circuit; it is characterized in that: described electromagnetic type tripping coil KA comprises current-limiting inductor KA1 and coil KA2; trip action is performed for described in executive circuit; current-limiting inductor KA1 is for absorbing moment surge voltage simultaneously; described one end of coil KA2 is connected with the ac input end of half-wave rectifying circuit, and one end of the other end of coil KA2 and the piezo-resistance RV1 of surge absorbing circuit is connected in parallel.
5. device for switching according to claim 1 can time delay over under-voltage protection circuit, it is characterized in that: be provided with overvoltage delay capacitor C1 in described Zenith tracking delay circuit, described overvoltage time delay process was formed by the charging interval of overvoltage delay capacitor C1; The voltage that described overvoltage time delay process terminates the DC output end referring to described half-wave rectifying circuit is be more than or equal to the state in the charging interval of described overvoltage delay capacitor C1 higher than duration of overvoltage set point.
6. according to claim 1 or 5 device for switching can time delay over under-voltage protection circuit; it is characterized in that: the one end of divider resistance R1 in described Zenith tracking delay circuit is connected with the DC output end of half-wave rectifying circuit; one end of divider resistance R2, one end of overvoltage delay capacitor C1 and earth polar are connected in parallel, and the other end of the other end of divider resistance R1, the other end of divider resistance R2, delay capacitor C1 is connected in parallel with the overvoltage control input end of triggering buffer circuit.
7. device for switching according to claim 1 can time delay over under-voltage protection circuit, it is characterized in that: described under voltage detects in delay circuit and is provided with under-voltage delay capacitor C3, and described under-voltage time delay process was formed by the charging interval of under-voltage delay capacitor C3; The voltage that described under-voltage time delay process terminates the DC output end referring to described half-wave rectifying circuit is be more than or equal to the state in the charging interval of described under-voltage delay capacitor C3 lower than duration of under-voltage set point.
8. the device for switching according to claim 1 or 7 can time delay over under-voltage protection circuit, it is characterized in that: described under voltage detects delay circuit and also comprises resistance R3, resistance R4, resistance R5, resistance R7, resistance R8, voltage-stabiliser tube VZ1, with electric capacity C2, wherein one end of resistance R3, one end of resistance R4 and the DC output end of half-wave rectifying circuit are connected in parallel, the E pole of triode Q1, the negative pole of voltage-stabiliser tube VZ1, one end of electric capacity C2 and the other end of resistance R3 are connected in parallel, the B pole of triode Q1 is connected with one end of resistance R7, the C pole of triode Q1 is connected with one end of resistance R8, the other end of resistance R8, one end of under-voltage delay capacitor C3 is connected in parallel with the under-voltage control input end of triggering buffer circuit, the other end of under-voltage delay capacitor C3, the positive pole of voltage-stabiliser tube VZ1, one end and the earth polar of resistance R5 are connected in parallel, the other end of electric capacity C2, the other end of resistance R4, the other end of resistance R5 and the other end of resistance R7 are connected in parallel.
9. device for switching according to claim 1 can time delay over under-voltage protection circuit; it is characterized in that: described triggering buffer circuit comprises voltage-stabiliser tube VZ2 and diode VD2; the negative pole of voltage-stabiliser tube VZ2 is overvoltage control input end; the just very under-voltage control input end of diode VD2, the dropout control input end of the positive pole of voltage-stabiliser tube VZ2 and the negative pole of diode VD2 and described executive circuit is connected in parallel.
10. device for switching according to claim 1 can time delay over under-voltage protection circuit, it is characterized in that: described executive circuit comprises electromagnetic type tripping coil KA, controllable silicon SCR and electric capacity C4, described electromagnetic type tripping coil KA is connected in series between the live wire phase L of AC power and the ac input end of half-wave rectifying circuit, the control pole of controllable silicon SCR and one end of electric capacity C4 are connected in parallel and form dropout control input end, the anode of controllable silicon SCR is connected with the DC output end of half-wave rectifying circuit, the negative electrode of controllable silicon SCR, the other end and the earth polar of electric capacity C4 are connected in parallel.
CN201520682847.2U 2015-09-06 2015-09-06 Undervoltage protection circuit of delaying of switch electrical apparatus Active CN204992525U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111049101A (en) * 2020-01-02 2020-04-21 中车青岛四方车辆研究所有限公司 Overvoltage protection circuit
CN115184724A (en) * 2022-06-29 2022-10-14 南通通成自动化技术有限公司 Join in marriage abnormal voltage detection circuit of electrical room

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111049101A (en) * 2020-01-02 2020-04-21 中车青岛四方车辆研究所有限公司 Overvoltage protection circuit
CN115184724A (en) * 2022-06-29 2022-10-14 南通通成自动化技术有限公司 Join in marriage abnormal voltage detection circuit of electrical room

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