CN103399215B - Phase-lack and low-voltage detection circuit for three-phase alternating current - Google Patents

Phase-lack and low-voltage detection circuit for three-phase alternating current Download PDF

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CN103399215B
CN103399215B CN201310319361.8A CN201310319361A CN103399215B CN 103399215 B CN103399215 B CN 103399215B CN 201310319361 A CN201310319361 A CN 201310319361A CN 103399215 B CN103399215 B CN 103399215B
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circuit
phase
voltage
input
low
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CN201310319361.8A
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CN103399215A (en
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谭富传
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北京航星力源科技有限公司
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Abstract

The invention relates to a phase-lack and low-voltage detection circuit for three-phase alternating current, and belongs to the technical field of power electronic products. The phase-lack and low-voltage detection circuit comprises three groups of phase detection circuits and a comparison output circuit, wherein the three groups of phase detection circuits are connected in parallel; the input end of each group of phase detection circuits is respectively connected with a phase alternating current input end of the three-phase alternating current in a power grid to be detected for respectively detecting phase-lack and low-voltage of the phase alternating current input; output ends of the three groups of phase detection circuits are connected with the input end of the comparison output circuit after being connected mutually, and a detection result is output by the comparison output circuit; each group of phase detection circuits comprises a rectifying circuit, a current-limiting circuit, an amplitude-limiting circuit, an opto-coupling isolating circuit, a charging and discharging circuit and an isolating circuit which are connected in sequence, wherein the input end of the rectifying circuit and the other input end of the opto-coupling isolating circuit are respectively connected with both ends of each phase alternating current. The phase-lack and low-voltage detection circuit has the characteristics that a two-in-one function of phase-lack detection and input low-voltage detection is realized, the circuits are simple, power consumption is very little, SMT (Surface Mounted Technology) can be realized and embedded in equipment, and the like.

Description

The phase shortage of three-phase alternating current and low-voltage testing circuit

Technical field

The invention belongs to power electronic product technical field, particularly the phase shortage of three-phase alternating current and low-voltage testing circuit design.

Background technology

In power electronic product field, powerful device generally adopts three-phase alternating current to power, such as: Electric Traction equipment, high power system, ups power system, electric equipment system etc., these products all relate to when three-phase alternating current phase shortage and low pressure, the problem how to work.At this moment, if circuit is protected not in time, these valuable equipment will be faced with by the danger of burning, once occur, bring massive losses can to production and tissue, so the phase shortage of three-phase alternating current and low-voltage testing circuit are that these equipment of protection are indispensable.

The phase shortage of traditional three-phase alternating current and the method for low-voltage testing circuit are by three transformer isolation, and detect the voltage of every cross streams electricity respectively, subsequent process circuit is complicated, in addition, its volume is large, Heavy Weight, and power consumption is large, the volume being far from applicable to modern comfort requirement is little, lightweight, the requirement of Micro Energy Lose etc., is not more suitable for the requirement in requirement embedded equipment.

Summary of the invention

The object of the invention is for prior art Problems existing, provide a kind of phase shortage and low-voltage testing circuit of three-phase alternating current, the present invention has pile defection and input low pressure detects two-in-one function, simple circuit, Micro Energy Lose, can realize SMT and be embedded into the medium feature of equipment.

The phase shortage of the three-phase alternating current that the present invention proposes and low-voltage testing circuit, it is characterized in that, comprise three groups of phase detecting circuits and compare output circuit, described three groups of phase detecting circuits are in parallel, the input end of each group phase detecting circuit is connected with a cross streams input end of tested electrical network three-phase alternating current respectively, for detecting phase shortage and the low pressure of the input of this cross streams respectively; Be connected with the input end comparing output circuit after the output terminal interconnection of three groups of phase detecting circuits, compare output circuit output detections result;

Each described group phase detecting circuit, comprises the rectification circuit, current-limiting circuit, amplitude limiter circuit, optical coupling isolation circuit, charge and discharge circuit and the buffer circuit that are connected successively; The input end of rectification circuit is connected with the two ends of every cross streams respectively with another input end of optical coupling isolation circuit;

Wherein:

High-voltage alternating electric rectification, for carrying out rectification to tested electrical network three-phase alternating current input, is high voltage direct current by described rectification circuit;

Described current-limiting circuit, carries out current limit for the high voltage direct current exported rectification circuit, is convenient to drive optical coupling isolation circuit normally to work;

Described amplitude limiter circuit, high voltage direct current for exporting current-limiting circuit carries out clamped, realize the phase shortage of this cross streams electricity and low pressure detects and (described clampedly refers to when the high-voltage dc voltage that current-limiting circuit exports is lower than this clamped voltage or phase shortage power-off, optical coupling isolation circuit will quit work, and the comparison output circuit of rear class then exports phase shortage and low-voltage signal; When the high-voltage dc voltage that current-limiting circuit exports is higher than this clamped voltage, optical coupling isolation circuit will start work);

Described optical coupling isolation circuit, for realizing the electrical isolation of high-tension circuit and the rear class low-voltage circuit (include but not limited to: charge and discharge circuit, buffer circuit, compare output circuit) of the input of this cross streams; And, realize effective transmission of this cross streams electricity duty (comprising normal condition, phase shortage and low-pressure state); Meanwhile, the discharging function of charge and discharge circuit is realized;

Described charge and discharge circuit, for to the phase shortage of this cross streams electricity and the Scanning Detction of low-voltage signal, charging circuit wherein, refer to that it is in scanning charging duty at any time, when phase shortage or low pressure appear in this cross streams input voltage, optical coupling isolation circuit will quit work, charging circuit works on until be full of, reach accessory power supply voltage (i.e. high level), output circuit is compared in triggering therebetween, and export phase shortage and low-voltage signal; Discharge circuit wherein, refer to when this cross streams input voltage is normal, optical coupling isolation circuit by the work of opening, the electric charge of the instantaneous charging circuit of releasing of discharge circuit, to make charging circuit can not set up effective charging voltage, at this moment charge and discharge circuit output low level;

Described buffer circuit, for isolating this road charge and discharge circuit, realize working alone of this road charge and discharge circuit, and charging voltage is exported to compare output circuit, when there is high level in charge and discharge circuit, then buffer circuit exports high level signal (namely phase shortage and low-pressure state appear in AC-input voltage), otherwise buffer circuit output low level signal (namely AC-input voltage is normal condition);

Described comparison output circuit, reference voltage for the voltage that exports three buffer circuits of three groups of phase detecting circuits and setting compares, and export comparative result, determine that three-phase alternating current is normal condition with this, or phase shortage and low-pressure state, during the equal output low level signal of and if only if three groups of phase detecting circuits, compare output circuit just output AC input normal signal.

Feature of the present invention and beneficial effect:

Three-phase alternating current input voltage in the present invention is transformed into high voltage direct current through three groups of rectification circuits respectively, realize micro-electric current through current-limiting circuit again to drive, after realize clamped to high voltage direct current through amplitude limiter circuit, then realize high-voltage alternating input through optical coupling isolation circuit to isolate with the high-low pressure of rear class low-voltage circuit, releasing of Signal transmissions and electric charge, the charge and discharge circuit of rear class passes through the phase shortage of discharge and recharge realization to three-phase alternating current input and the continuous sweep of low pressure of electric charge, and then realize working alone of three groups of charge and discharge circuit by buffer circuit and export charging voltage signal, finally by comparing output circuit, described charging voltage signal and given reference voltage are compared, export the normal signal of three-phase alternating current input voltage, phase shortage and low-voltage signal, achieve phase shortage and the low-voltage detection function of three-phase alternating current.

This circuit is compared with traditional transformer detection mode, simple circuit, reliable and stable, circuit realiration Micro Energy Lose work, green energy conservation, and and then achieve microminiaturization, the feature that can work in embedded equipment, has adapted to the requirement that current device develops miniaturization day by day.

In the phase shortage that the present invention can be widely used in the three-phase alternating current input voltage of power equipment and low-voltage testing circuit; be specially adapted to require that embedded design solves the phase shortage to three-phase alternating current input voltage of miniaturization Switching Power Supply, ups power, inverter, variable-frequency power sources etc. and the problem of low pressure detection, thus realize the available protecting to power supply.

Accompanying drawing explanation

Fig. 1 is the phase shortage and the low-voltage testing circuit structured flowchart that exchange the three-phase alternating current inputted when adopting three-phase three-wire system mode of the present invention.

Fig. 2 is phase shortage and low-voltage testing circuit embodiment 1 circuit diagram of a three-phase three-wire system three-phase alternating current of the present invention.

Fig. 3 is the phase shortage and the low-voltage testing circuit structured flowchart that exchange the three-phase alternating current inputted when adopting three-phase four-wire system mode of the present invention.

Fig. 4 is phase shortage and low-voltage testing circuit embodiment 2 circuit diagram of a three-phase four-wire system three-phase alternating current of the present invention.

Embodiment

Below in conjunction with each accompanying drawing, content of the present invention and embodiment are described in further detail.

The phase shortage of three-phase alternating current of the present invention and low-voltage testing circuit, three-phase or any cross streams electricity of any voltage and frequency can be detected, include but not limited to AC380V/50HZ(or 60HZ) three-phase alternating current, AC440V/50HZ(or 60HZ) three-phase alternating current, AC220V/50HZ(or 60HZ) three-phase alternating current, AC200V/400HZ three-phase alternating current.

The present invention is used for the phase shortage of three-phase alternating current of three-phase three-wire system and low-voltage testing circuit general structure as shown in Figure 1, described three-phase alternating current input, refer to that the external electrical network of equipment exchanges input, the power supply mode of employing is three-phase three-wire system, and three-phase is respectively UV phase, VW phase, UW phase; Three lines are respectively U line, V line and W line; This circuit comprises three groups of mutually isostructural phase detecting circuit PHSDT and compares output circuit, described three groups of phase detecting circuits are in parallel, the input end of each group phase detecting circuit is connected with a cross streams input end of tested electrical network three-phase alternating current respectively, for detecting phase shortage and the low pressure of the input of this cross streams respectively; Be connected with the input end comparing output circuit after the output terminal interconnection of three groups of phase detecting circuits, compare output circuit output detections result; Each described group phase detecting circuit, comprises the rectification circuit, current-limiting circuit, amplitude limiter circuit, optical coupling isolation circuit, charge and discharge circuit and the buffer circuit that are connected successively; The input end of rectification circuit is connected with the two ends of every cross streams respectively with another input end of optical coupling isolation circuit.

Wherein, high-voltage alternating electric rectification, for carrying out rectification to tested electrical network three-phase alternating current input, is high voltage direct current by described rectification circuit;

Described current-limiting circuit, carries out current limit for the high voltage direct current exported rectification circuit, is convenient to drive optical coupling isolation circuit normally to work;

Described amplitude limiter circuit, high voltage direct current for exporting current-limiting circuit carries out clamped, realize the phase shortage of this cross streams electricity and low pressure detects and (described clampedly refers to when the high-voltage dc voltage that current-limiting circuit exports is lower than this clamped voltage or phase shortage power-off, optical coupling isolation circuit will quit work, and the comparison output circuit of rear class then exports phase shortage and low-voltage signal; When the high-voltage dc voltage that current-limiting circuit exports is higher than this clamped voltage, optical coupling isolation circuit will start work);

Described optical coupling isolation circuit, for realizing the electrical isolation of high-tension circuit and the rear class low-voltage circuit (include but not limited to: charge and discharge circuit, buffer circuit, compare output circuit) of the input of this cross streams; And, realize effective transmission of this cross streams electricity duty (comprising normal condition, phase shortage and low-pressure state); Meanwhile, the discharging function of charge and discharge circuit is realized;

Described charge and discharge circuit, for to the phase shortage of this cross streams electricity and the Scanning Detction of low-voltage signal, charging circuit wherein, refer to that it is in scanning charging duty at any time, when phase shortage or low pressure appear in this cross streams input voltage, optical coupling isolation circuit will quit work, charging circuit works on until be full of, reach accessory power supply voltage (i.e. high level), output circuit is compared in triggering therebetween, and export phase shortage and low-voltage signal; Discharge circuit wherein, refer to when this cross streams input voltage is normal, optical coupling isolation circuit by the work of opening, the electric charge of the instantaneous charging circuit of releasing of discharge circuit, to make charging circuit can not set up effective charging voltage, at this moment charge and discharge circuit output low level;

Described buffer circuit, for isolating this road charge and discharge circuit, realize working alone of this road charge and discharge circuit, and charging voltage is exported to compare output circuit, when there is high level in charge and discharge circuit, then buffer circuit exports high level signal (namely phase shortage and low-pressure state appear in AC-input voltage), otherwise buffer circuit output low level signal (namely AC-input voltage is normal condition);

Described comparison output circuit, reference voltage for the voltage that exports three buffer circuits of three groups of phase detecting circuits and setting compares, and export comparative result, determine that three-phase alternating current is normal condition with this, or phase shortage and low-pressure state, during the equal output low level signal of and if only if three groups of phase detecting circuits, compare output circuit just output AC input normal signal.

Principle of work of the present invention is:

Three-phase alternating current input voltage in the present invention is transformed into high voltage direct current through the rectification circuit often organized in phase detecting circuit, realize micro-electric current through current-limiting circuit again to drive, after realize clamped to high voltage direct current through amplitude limiter circuit, then realize high-voltage alternating input through optical coupling isolation circuit to isolate with the high-low pressure of rear class low-voltage circuit, releasing of Signal transmissions and electric charge, the charge and discharge circuit of rear class passes through the phase shortage of discharge and recharge realization to three-phase alternating current input and the continuous sweep of low pressure of electric charge, and then realize working alone of three groups of charge and discharge circuit by buffer circuit and export charging voltage signal, finally by comparing output circuit, described charging voltage signal and given reference voltage are compared, export the normal signal of three-phase alternating current input voltage, phase shortage and low-voltage signal, achieve phase shortage and the low-voltage detection function of three-phase alternating current.

Be described as follows:

Circuit of the present invention forms phase shortage and the low pressure detection path of three identical on high-tension side three-phase alternating current inputs, this path inputs from this described cross streams, through described rectification circuit, current-limiting circuit, amplitude limiter circuit, to described optical coupling isolation circuit, finally turn back to the input of this cross streams; When three-phase alternating current input any there is phase shortage mutually, due to power-off, optical coupling isolation circuit just stopped work; In addition, when three-phase alternating current input any there is low pressure mutually, due to the clamped effect of amplitude limiter circuit, thus current-limiting circuit export voltage can not pass through amplitude limiter circuit and arrive optical coupling isolation circuit, cause optical coupling isolation circuit also to stopped work; Only in all normal situation of three-phase alternating voltage, the voltage that current-limiting circuit exports can pass through amplitude limiter circuit, and then under the effect of current-limiting circuit, drives optical coupling isolation circuit work.Described three identical phase detecting circuit PHSDT, constitute detection path when phase shortage or low pressure appear in any phase of three-phase alternating current input or two-phase or three-phase, these three paths are all from three-phase alternating current input and converge in the output of buffer circuit; As long as phase shortage or low pressure appear in any phase, buffer circuit all can export the voltage (high level) of accessory power supply, inputs to and compares output circuit, and compare with lower reference voltage, exports phase shortage and low-voltage signal.

Circuit of the present invention also forms a charging path, and this path is from described accessory power supply to charging circuit, and during work, this path is in the mode of charging, and continuous sweep, until be full of, voltage reaches accessory power supply voltage (high level).

Circuit of the present invention forms a discharge path simultaneously, this path is from charge and discharge circuit, to optical coupling isolation circuit, when this cross streams input voltage is normal, optical coupling isolation circuit ON operation, electric charge in charging circuit is released through optical coupling isolation circuit is instantaneous, like this, charging process, discharge process hockets, go round and begin again, until three-phase alternating current input is any when there is phase shortage or low pressure mutually, in the phase detecting circuit PHSDT of this phase, optical coupling isolation circuit quits work, at this moment, only has charging process, there is no discharge process, charging process is until electric charge is full of.

A phase shortage specifically for three-phase three-wire system alternating current of the present invention and low-voltage testing circuit embodiment 1 structure as shown in Figure 2,

The present embodiment comprises three groups of identical phase detecting circuit PHSDT(dotted box 100) and export comparator circuit, three-phase alternating current is input as UV phase, VW phase and UW phase, this three-phase alternating current is input to three groups of phase detecting circuit PHSDT respectively, and then goes out phase shortage and the low-pressure state of every phase voltage by three groups of PHSDT continuous detecting; Described phase detecting circuit PHSDT comprises rectification circuit D1, current-limiting circuit R1, amplitude limiter circuit V1, optical coupling isolation circuit N1, charge and discharge circuit R2, C1, N1 and accessory power supply VCC and buffer circuit D2; Described output comparator circuit comprises comparer N2, voltage reference V2 and accessory power supply VCC;

The each parts of the present embodiment realize structure and function is respectively described below:

In the phase detecting circuit PHSDT that three groups of structures of the present embodiment are identical, the specific implementation structure of each group phase detecting circuit PHSDT is: rectification circuit adopts diode D1, current-limiting circuit adopts current-limiting resistance R1, amplitude limiter circuit adopts voltage stabilizing diode V1, optical coupling isolation circuit N1(adopts 4N25 optical coupling isolator, be made up of light emitting diode and output triode), charge and discharge circuit is by charging resistor R2, charging and discharging electric capacity C1, optical coupling isolator N1 and accessory power supply VCC(adopts LM7812) form, and buffer circuit is made up of isolating diode D2, wherein the anode of the diode D1 of rectification circuit is connected to and exchanges input U end, the negative electrode 110 of D1 is connected with current-limiting resistance R1, R1 output terminal 120 is connected with the negative electrode of amplitude limiter circuit voltage stabilizing diode V1, the anode tap 130 of V1 is connected to the anode of optical coupling isolator N1 light emitting diode, the negative electrode of N1 light emitting diode is connected to and exchanges input V end, define the high-pressure side phase shortage and low pressure detection that exchange input UV phase, the collector 140 of optical coupling isolator N1 output triode respectively with charging resistor R2, charging and discharging electric capacity C1 is connected with isolating diode D2, the emitter of N1 output triode is connected to the ground end GND of accessory power supply, the other end of charging resistor R2 is connected to the power end VCC of accessory power supply, the other end of charging and discharging electric capacity C1 holds GND with being connected to, charging voltage is exported by the cathode terminal 150 of isolating diode D2.

Described commutation diode D1 is used for carrying out half-wave rectification to interchange input UV phase, exports half-wave high voltage direct current to 110 ends; Symmetrical sine ripple is input as, as long as so half-wave sampling just can detect the phase shortage and low pressure that exchange input owing to exchanging; In addition, diode D1 subjects the high back voltage exchanging input UV phase, and protection optical coupling isolator N1 is not by this high-voltage breakdown;

Described current-limiting resistance R1 is used for carrying out current limliting to the high voltage direct current of 110 ends, drives the work of light emitting diode in optical coupling isolator N1 with suitable electric current simultaneously;

Described amplitude limit voltage stabilizing diode V1 is used for carrying out clamped to the high voltage direct current of current-limiting resistance R1 output terminal 120, the phase shortage and the low pressure that realize UV cross streams electricity detect, when exchanging input UV phase and occurring phase shortage, the power-off of UV phase, optical coupling isolator N1 will quit work, or when the high-voltage dc voltage of 120 ends is lower than this clamped voltage, 130 ends with exchange that to input the voltage that V holds be 0, optical coupling isolator N1 will quit work, at this moment, the voltage of 140 ends is slowly charged to VCC, and outputs to 150 ends by isolating diode D2, and now 150 ends are high level; When UV phase voltage is normal, the high-voltage dc voltage of 120 ends is higher than this clamped voltage, the voltage of 120 ends will be crossed stabilivolt V1 and arrive 130 ends, so the light emitting diode in optical coupling isolator N1 obtains electric current and luminescence, and then the triode ON work in driving optical coupling isolator N1, electric charge on C1 is by the triode immediate leakage in N1, and the voltage of 140 ends is 0(low level);

Described optical coupling isolator N1 exchanges the high-tension circuit of input UV phase and the electrical isolation of rear class low-voltage circuit R2, C1, D2 etc. for realizing; And realize the Signal transmissions exchanging the normal condition, phase shortage and the low-pressure state that input UV phase voltage, when there is phase shortage and low pressure, light emitting diode no-voltage in N1, not luminous, so the triode in N1 by, when exchanging input UV phase voltage and being normal, the lumination of light emitting diode in N1 triode ON work in driving N 1; In addition, optical coupling isolator N1 is for realizing the discharging function to charge and discharge capacitance C1;

Described charge and discharge circuit R2, C1, N1 and accessory power supply VCC, for the Scanning Detction to the phase shortage and low pressure that exchange input UV phase, comprise charging circuit and discharge circuit, charging circuit is made up of accessory power supply VCC, charging resistor R2 and charging capacitor C1, when exchanging input UV phase and occurring phase shortage and low pressure, in optical coupling isolator N1 triode by, at this moment, accessory power supply VCC slowly will be charged to electric capacity C1 by charging resistor R2, until be full of, the voltage on 140 ends reaches VCC(high level), discharge circuit is made up of discharge capacity C1 and optical coupling isolator N1, when exchanging input UV phase voltage and being normal, the triode ON in optical coupling isolator N1, so, electric charge on discharge capacity C1 was released through this triode moment, and the voltage on 140 ends is 0(low level), described Scanning Detction, comprise intermittent scanning to detect and continuous sweep detection, intermittent scanning detects the sine wave referred in each interchange incoming frequency cycle, all there is charging circuit VCC by the slow charging process of R2 to electric capacity C1 and the process that sparks of discharge circuit C1 and N1, when UV cross streams input voltage is normal, because 110 ends are that half-wave is sinusoidal wave, so in a frequency cycle, the voltage of 120 ends is within the time lower than the clamped voltage of V1, optical coupling isolator N1 will quit work, namely charging circuit slowly charges to electric capacity C1, and within the time of sine voltage higher than the clamped voltage of V1, triode in optical coupling isolator N1 is by ON operation, namely discharge circuit sparks to electric capacity C1, exchange in the incoming frequency cycle at one like this, on the electric capacity C1 of 140 ends, foundation does not play effective voltage (low level), and by isolating diode D2, this voltage is outputted on 150 ends, achieve the intermittent scanning exchanged in the incoming frequency cycle to detect, continuous sweep detects the sine voltage referring to each interchange incoming frequency cycle of continuous detecting, when there is the phase shortage in some cycles and low pressure or long-term phase shortage and low pressure, namely optical coupling isolator N1 quits work, electric capacity C1 is by trickle charge, until reach accessory power supply voltage VCC(high level), voltage on 140 ends and 150 ends becomes high level, and the continuous sweep achieving UV phase phase shortage and low pressure detects,

Described isolating diode D2, for the isolation to charge and discharge circuit R2, C1 and N1, realize working alone of three groups of charge and discharge circuit, and the comparison output circuit charging voltage on 140 ends exported on 150 ends, because the sequential and voltage that exchange input UV phase, VW phase and UW phase are different, cause the voltage on 140 ends also different, by the isolating diode in three groups of PHSDT circuit, effectively isolate mutual voltage crosstalk, and export that charging voltage the highest in three groups of PHSDT;

Circuit 100 described in the present embodiment forms on high-tension side phase shortage and a low pressure detection path exchanging input, this path is from described interchange input U line, through commutation diode D1, current-limiting resistance R1, limiter diode V1, to optical coupling isolator N1, and turn back to interchange input V line, when exchanging input UV phase phase shortage, due to power-off, optical coupling isolator N1 just stopped work, and the triode in N1 is in by state; In addition, when exchanging input UV phase low pressure, due to the clamped effect of limiter diode V1, so optical coupling isolator N1 also stopped work, the triode in N1 is also in by state; Only in the normal situation of interchange input UV phase voltage, optical coupling isolator N1 just normally works, and the triode in N1 is in conducting state;

Circuit 100 described in the present embodiment also forms a charging path, this path is from described accessory power supply VCC, charging resistor R2, to charging capacitor C1, due to the triode in N1 by, so accessory power supply VCC is just slowly charged to electric capacity C1 by resistance R2, until be full of, voltage reaches accessory power supply voltage VCC(high level);

Circuit 100 described in the present embodiment forms a discharge path simultaneously, this path is from the triode in electric capacity C1, optical coupling isolator N1, ground GND to accessory power supply VCC, when exchanging input UV phase voltage and being normal, triode ON in N1, the instantaneous GND(low level of releasing of the triode of the electric charge on electric capacity C1 in N1);

The output comparator circuit of the present embodiment adopts LM393 comparer by comparer N2(), voltage reference V2 and accessory power supply VCC forms, wherein, voltage reference V2 is connected to an input end of comparer N2, as the benchmark voltage of comparer N2,150 ends are as another input of comparer N2, when 150 terminal voltages (during high level) are more than V2 voltage, export phase shortage and the low-voltage signal of UV phase at 160 ends of comparer N2; When 150 terminal voltages (during low level) are lower than V2 voltage, export UV phase voltage normal signal at 160 ends of comparer N2.

The present embodiment is with three identical phase detecting circuit PHSDT, constitute three-phase alternating current input and (comprise UV phase, VW phase, UW phase) in any phase, or two-phase, or the detection MP major path of three-phase when there is phase shortage or low pressure, these three paths are all input from three-phase alternating current, commutation diode D1, current-limiting resistance R1, limiter diode V1, optical coupling isolator N1, charging resistor R2, charge and discharge capacitance C1, isolating diode D2, and converge at isolation and amplifier 150 end, as long as there is phase shortage or low pressure in any phase, circuit 100 all can export accessory power supply VCC voltage (high level), be input to comparer N2, and compare with lower reference voltage V 2, export 160 ends at comparer N2 and export phase shortage and low-voltage signal.

The phase shortage of the three-phase alternating current adopting three-phase four-wire system of the present invention interchange to input and low-voltage testing circuit structured flowchart are as shown in Figure 3, wherein four lines are respectively U line, V line, W line and N line (center line), three-phase alternating current is respectively UN phase, VN phase and WN phase, this circuit comprises three groups of mutually isostructural phase detecting circuit PHSDT equally and compares output circuit, described three groups of phase detecting circuits are in parallel, the input end of each group phase detecting circuit is connected with a cross streams input end of tested electrical network three-phase alternating current respectively, for detecting phase shortage and the low pressure of the input of this cross streams respectively; Be connected with the input end comparing output circuit after the output terminal interconnection of three groups of phase detecting circuits, compare output circuit output detections result; Each described group phase detecting circuit, comprises the rectification circuit, current-limiting circuit, amplitude limiter circuit, optical coupling isolation circuit, charge and discharge circuit and the buffer circuit that are connected successively; Wherein, the input end of rectification circuit is connected with the two ends of every cross streams respectively with another input end of optical coupling isolation circuit.Equally, the phase shortage with three-phase three-wire system alternating current is the same with low pressure detection method, and the present invention is applicable to phase shortage and the low pressure detection of three-phase four-wire system alternating current completely.

Adopt the phase shortage of a three-phase four-wire system AC-input voltage of the present invention and low-voltage testing circuit embodiment 2 as shown in Figure 4, in figure, N is center line, three-phase alternating current is respectively UN phase, VN phase and WN phase, same circuit structure and embodiment and foregoing identical, the phase shortage and low pressure that adopt the present invention to detect to exchange any phase, two-phase or three-phase in input.

It is to be understood that; the phase shortage of three-phase alternating current described above and low-voltage testing circuit; comprise phase shortage and the low-voltage testing circuit of the alternating current of any phase; and relate to this type of application; be only illustrate as of the present invention, other relates to according to the present invention, and the equivalent replacement of institute's resist technology scheme and the circuit of conversion all should covered within protection scope of the present invention in the claims.

Claims (5)

1. the phase shortage of a three-phase alternating current and low-voltage testing circuit, it is characterized in that, this circuit comprises three groups of phase detecting circuits and compares output circuit, described three groups of phase detecting circuits are in parallel, the input end of each group phase detecting circuit is connected with a cross streams input end of tested electrical network three-phase alternating current respectively, for detecting phase shortage and the low pressure of the input of this cross streams respectively; Be connected with the input end comparing output circuit after the output terminal interconnection of three groups of phase detecting circuits, compare output circuit output detections result; Each described group phase detecting circuit, comprises the rectification circuit, current-limiting circuit, amplitude limiter circuit, optical coupling isolation circuit, charge and discharge circuit and the buffer circuit that are connected successively; The input end of rectification circuit is connected with the two ends of every cross streams respectively with another input end of optical coupling isolation circuit;
Wherein:
High-voltage alternating electric rectification, for carrying out rectification to tested electrical network three-phase alternating current input, is high voltage direct current by described rectification circuit;
Described current-limiting circuit, carries out current limit for the high voltage direct current exported rectification circuit, is convenient to drive optical coupling isolation circuit normally to work;
Described amplitude limiter circuit, carries out clamped for the high voltage direct current exported current-limiting circuit, and the phase shortage and the low pressure that realize this cross streams electricity detect;
Described optical coupling isolation circuit, for realizing high-tension circuit and the electrical isolation of rear class low-voltage circuit of the input of this cross streams; And, realize effective transmission of this cross streams electricity duty; Meanwhile, the discharging function of charge and discharge circuit is realized;
Described charge and discharge circuit, for to the phase shortage of this cross streams electricity and the Scanning Detction of low-voltage signal, charging circuit wherein, refer to that it is in scanning charging duty at any time, when phase shortage or low pressure appear in this cross streams input voltage, optical coupling isolation circuit will quit work, charging circuit works on until be full of, reach accessory power supply voltage, output circuit is compared in triggering therebetween, and export phase shortage and low-voltage signal; Discharge circuit wherein, refer to when this cross streams input voltage is normal, optical coupling isolation circuit by the work of opening, the electric charge of the instantaneous charging circuit of releasing of discharge circuit, to make charging circuit can not set up effective charging voltage, at this moment charge and discharge circuit output low level;
Described buffer circuit, for isolating this road charge and discharge circuit, realize working alone of this road charge and discharge circuit, and charging voltage is exported to compare output circuit, when there is high level in charge and discharge circuit, then buffer circuit exports high level signal, otherwise buffer circuit output low level signal;
Described comparison output circuit, reference voltage for the voltage that exports three buffer circuits of three groups of phase detecting circuits and setting compares, and export comparative result, determine that three-phase alternating current is normal condition with this, or phase shortage and low-pressure state, during the equal output low level signal of and if only if three groups of phase detecting circuits, compare output circuit just output AC input normal signal.
2. the phase shortage of three-phase alternating current and low-voltage testing circuit as claimed in claim 1, it is characterized in that, phase shortage and the low-voltage testing circuit of described three-phase alternating current form phase shortage and the low pressure detection path of three identical on high-tension side three-phase alternating current inputs, every bar path inputs from this cross streams, through described rectification circuit, current-limiting circuit, amplitude limiter circuit, to described optical coupling isolation circuit, finally turn back to the input of this cross streams; Described three identical phase detecting circuits, constitute detection path when phase shortage or low pressure appear in any phase of three-phase alternating current input or two-phase or three-phase, these three paths are all from three-phase alternating current input and converge in the output of buffer circuit; As long as phase shortage or low pressure appear in any phase, buffer circuit all can export the voltage of accessory power supply, inputs to and compares output circuit, and compares with lower reference voltage, exports phase shortage and low-voltage signal.
3. the phase shortage of three-phase alternating current and low-voltage testing circuit as claimed in claim 1, it is characterized in that, the phase shortage of described three-phase alternating current and low-voltage testing circuit also form a charging path, this path is from described accessory power supply to charging circuit, during work, this path with charging mode, continuous sweep, until be full of, voltage reaches accessory power supply voltage; The phase shortage of described three-phase alternating current and low-voltage testing circuit form a discharge path simultaneously, this path is from charge and discharge circuit, to optical coupling isolation circuit, when this cross streams input voltage is normal, optical coupling isolation circuit ON operation, the electric charge in charging circuit is released through optical coupling isolation circuit is instantaneous; Charging process, discharge process hocket, and go round and begin again, until three-phase alternating current input is any when there is phase shortage or low pressure mutually, in the phase detecting circuit of this phase, optical coupling isolation circuit quits work, and charging process is until electric charge is full of.
4. the phase shortage of three-phase alternating current and low-voltage testing circuit as claimed in claim 1, it is characterized in that, rectification circuit in each group phase detecting circuit adopts diode (D1), current-limiting circuit adopts current-limiting resistance (R1), amplitude limiter circuit adopts voltage stabilizing diode (V1), optical coupling isolation circuit adopts the optical coupling isolator (N1) be made up of light emitting diode and output triode, charge and discharge circuit is by charging resistor (R2), charging and discharging electric capacity (C1), optical coupling isolator (N1) and accessory power supply (VCC) are formed, and buffer circuit adopts isolating diode (D2) composition, wherein the anode of the diode (D1) of rectification circuit is connected to every cross streams input end, the negative electrode of the diode (D1) of rectification circuit is connected with current-limiting resistance (R1), current-limiting resistance (R1) output terminal is connected with the negative electrode of amplitude limiter circuit voltage stabilizing diode (V1), the anode tap of amplitude limiter circuit voltage stabilizing diode (V1) is connected to the anode of the light emitting diode of optical coupling isolator (N1), the negative electrode of light emitting diode is connected to every cross streams input end, form high-pressure side phase shortage and the low pressure sampling of the input of every cross streams, the collector of optical coupling isolator (N1) output triode respectively with charging resistor (R2), charging and discharging electric capacity (C1) is connected with isolating diode (D2), the emitter of the output triode of optical coupling isolator (N1) is connected to the ground end (GND) of accessory power supply, the other end of charging resistor (R2) is connected to the power end (VCC) of accessory power supply, the other end of charging and discharging electric capacity (C1) is held (GND) with being connected to, charging voltage is exported by the cathode terminal of isolating diode (D2).
5. the phase shortage of three-phase alternating current and low-voltage testing circuit as claimed in claim 1, it is characterized in that, described output comparator circuit is made up of comparer (N2), voltage reference (V2) and accessory power supply (VCC), wherein, voltage reference (V2) is connected to an input end of comparer (N2), as the benchmark voltage of comparer (N2), when another input end (150) voltage of comparer (N2) exceedes voltage reference (V2) voltage, comparer (N2) exports phase shortage and the low-voltage signal of UV phase; When another input end (150) voltage of comparer (N2) is lower than voltage reference (V2) voltage, comparer (N2) exports UV phase voltage normal signal.
CN201310319361.8A 2013-07-26 2013-07-26 Phase-lack and low-voltage detection circuit for three-phase alternating current CN103399215B (en)

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CN105141298B (en) * 2014-06-03 2018-07-06 北京动力源科技股份有限公司 A kind of single-phase power ON-OFF control circuit and AC power supply system with the circuit
CN104215825A (en) * 2014-08-20 2014-12-17 国家电网公司 Comprehensive online monitoring system for power transformer
CN105572523A (en) * 2014-10-09 2016-05-11 中兴通讯股份有限公司 AC detection circuit
CN105513523B (en) * 2016-01-29 2018-01-02 北京航星力源科技有限公司 A kind of automatic multi-function display circuit for power electronic equipment
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