CN103399215A - 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 PDFInfo
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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
Technical field
The invention belongs to the power electronic product technical field, particularly the phase shortage of three-phase alternating current and low-voltage testing circuit design.
Background technology
In the power electronic product field, powerful device generally adopts the three-phase alternating current power supply, such as: Electric Traction equipment, large power, electrically origin 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 of how to work.At this moment, if circuit is protected not in time, these valuable equipment will be faced with the danger of being burnt, in case occur, bring massive losses can for 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 with three transformer isolation, and detect respectively the voltage of every cross streams electricity, the subsequent process circuit complexity, in addition, its volume is large, Heavy Weight, and power consumption is large, the volume that has been applicable to far from the modern comfort requirement is little, lightweight, the requirement of micro-power consumption etc., more is not suitable for the requirement in the requirement embedded equipment.
Summary of the invention
The objective of the invention is the problem that exists for prior art, a kind of phase shortage and low-voltage testing circuit of three-phase alternating current are provided, and the present invention has phase shortage and detects and input low pressure detection two-in-one function, simple circuit, micro-power consumption, can realize SMT and be embedded into the medium characteristics of equipment.
Phase shortage and the low-voltage testing circuit of the three-phase alternating current that the present invention proposes, it is characterized in that, comprise three groups of phase detecting circuits and compare output circuit, described three groups of phase detecting circuit parallel connections, 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 respectively phase shortage and the low pressure of this cross streams input; After the output terminal interconnection of three groups of phase detecting circuits, with the input end that compares output circuit, be connected, relatively output circuit output detections result;
Described each group phase detecting circuit, comprise 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:
Described rectification circuit, for tested electrical network three-phase alternating current input is carried out to rectification, is high voltage direct current by the high-voltage alternating electric rectification;
Described current-limiting circuit, carry out current limit for the high voltage direct current to rectification circuit output, is convenient to drive the optical coupling isolation circuit normal operation;
Described amplitude limiter circuit, for the high voltage direct current to current-limiting circuit output, carry out clamped, realize that the phase shortage of this cross streams electricity and low pressure detect (described clamped referring to when the high-voltage dc voltage of current-limiting circuit output cuts off the power supply lower than this clamped voltage or phase shortage, optical coupling isolation circuit will quit work, and the comparison output circuit of rear class is exported phase shortage and low-voltage signal; During higher than this clamped voltage, optical coupling isolation circuit will start work when the high-voltage dc voltage of current-limiting circuit output);
Described optical coupling isolation circuit, be used to the high-tension circuit of realizing the input of this cross streams and the electrical isolation of rear class low-voltage circuit (including but not limited to: charge and discharge circuit, buffer circuit, comparison output circuit); And, realize effective transmission of this cross streams electricity work state (comprising normal condition, phase shortage and low-pressure state); Simultaneously, realize the discharging function of charge and discharge circuit;
Described charge and discharge circuit, scanning for the phase shortage to this cross streams electricity and low-voltage signal detects, 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 (being high level), will trigger relatively output circuit therebetween, and output phase shortage and low-voltage signal; Discharge circuit wherein, refer to that optical coupling isolation circuit will be opened work when this cross streams input voltage is normal, the electric charge of the instantaneous charging circuit of releasing of discharge circuit, so that charging circuit can not set up effective charging voltage, charge and discharge circuit output low level at this moment;
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 the comparison output circuit, when high level appears in charge and discharge circuit, buffer circuit is exported high level signal (being that phase shortage and low-pressure state appear in AC-input voltage), otherwise buffer circuit output low level signal (being that AC-input voltage is normal condition);
Described relatively output circuit, for the voltage of three buffer circuit outputs to three groups of phase detecting circuits and the reference voltage of setting, compare, and output comparative result, with this, determine that three-phase alternating current is normal condition, or phase shortage and low-pressure state, during and if only if three groups of equal output low level signals of phase detecting circuit, the output circuit normal signal of output AC input just relatively.
Characteristics 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, through current-limiting circuit, realize micro-current drives again, through amplitude limiter circuit, realize clamped to high voltage direct current afterwards, then through optical coupling isolation circuit, realize the high-low pressure isolation of high-voltage alternating input and rear class low-voltage circuit, releasing of signal transmission and electric charge, the charge and discharge circuit of rear class realizes the phase shortage of three-phase alternating current input and the continuous sweep of low pressure by discharging and recharging of electric charge, and then realize working alone of three groups of charge and discharge circuit and export the charging voltage signal by buffer circuit, finally by output circuit relatively, described charging voltage signal and given reference voltage are compared, the normal signal of output three-phase alternating current input voltage, phase shortage and low-voltage signal, phase shortage and the low-voltage detection function of three-phase alternating current have been realized.
This circuit is compared with the traditional transformer detection mode, simple circuit, reliable and stable, circuit have been realized micro-power consumption work, green energy conservation, and and then realized microminiaturization, but the characteristics of working in embedded equipment have adapted to the requirement that current device develops miniaturization day by day.
The present invention can be widely used in the phase shortage and low-voltage testing circuit of three-phase alternating current input voltage of power equipment; be specially adapted to the problem that the phase shortage to the three-phase alternating current input voltage that requires embedded design to solve miniaturization Switching Power Supply, ups power, inverter, variable-frequency power sources etc. and low pressure detect, thereby realize the effective protection to power supply.
The accompanying drawing explanation
Phase shortage and the low-voltage testing circuit structured flowchart of the three-phase alternating current when Fig. 1 is interchange input employing 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.
Phase shortage and the low-voltage testing circuit structured flowchart of the three-phase alternating current when Fig. 3 is interchange input employing three-phase four-wire system mode of the present invention.
Fig. 4 is phase shortage and low-voltage testing circuit embodiment 2 circuit diagrams 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, can detect the three-phase of any voltage and frequency or any cross streams electricity, 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 for the phase shortage of the 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, the external electrical network that refers to equipment exchanges input, and 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 the phase detecting circuit PHSDT of three groups of same structures and compares output circuit, described three groups of phase detecting circuit parallel connections, 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 respectively phase shortage and the low pressure of this cross streams input; After the output terminal interconnection of three groups of phase detecting circuits, with the input end that compares output circuit, be connected, relatively output circuit output detections result; Described each group phase detecting circuit, comprise 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, described rectification circuit, for tested electrical network three-phase alternating current input is carried out to rectification, be high voltage direct current by the high-voltage alternating electric rectification;
Described current-limiting circuit, carry out current limit for the high voltage direct current to rectification circuit output, is convenient to drive the optical coupling isolation circuit normal operation;
Described amplitude limiter circuit, for the high voltage direct current to current-limiting circuit output, carry out clamped, realize that the phase shortage of this cross streams electricity and low pressure detect (described clamped referring to when the high-voltage dc voltage of current-limiting circuit output cuts off the power supply lower than this clamped voltage or phase shortage, optical coupling isolation circuit will quit work, and the comparison output circuit of rear class is exported phase shortage and low-voltage signal; During higher than this clamped voltage, optical coupling isolation circuit will start work when the high-voltage dc voltage of current-limiting circuit output);
Described optical coupling isolation circuit, be used to the high-tension circuit of realizing the input of this cross streams and the electrical isolation of rear class low-voltage circuit (including but not limited to: charge and discharge circuit, buffer circuit, comparison output circuit); And, realize effective transmission of this cross streams electricity work state (comprising normal condition, phase shortage and low-pressure state); Simultaneously, realize the discharging function of charge and discharge circuit;
Described charge and discharge circuit, scanning for the phase shortage to this cross streams electricity and low-voltage signal detects, 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 (being high level), will trigger relatively output circuit therebetween, and output phase shortage and low-voltage signal; Discharge circuit wherein, refer to that optical coupling isolation circuit will be opened work when this cross streams input voltage is normal, the electric charge of the instantaneous charging circuit of releasing of discharge circuit, so that charging circuit can not set up effective charging voltage, charge and discharge circuit output low level at this moment;
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 the comparison output circuit, when high level appears in charge and discharge circuit, buffer circuit is exported high level signal (being that phase shortage and low-pressure state appear in AC-input voltage), otherwise buffer circuit output low level signal (being that AC-input voltage is normal condition);
Described relatively output circuit, for the voltage of three buffer circuit outputs to three groups of phase detecting circuits and the reference voltage of setting, compare, and output comparative result, with this, determine that three-phase alternating current is normal condition, or phase shortage and low-pressure state, during and if only if three groups of equal output low level signals of phase detecting circuit, the output circuit normal signal of output AC input just relatively.
Principle of work of the present invention is:
the rectification circuit of three-phase alternating current input voltage in every group of phase detecting circuit in the present invention is transformed into high voltage direct current, through current-limiting circuit, realize micro-current drives again, through amplitude limiter circuit, realize clamped to high voltage direct current afterwards, then through optical coupling isolation circuit, realize the high-low pressure isolation of high-voltage alternating input and rear class low-voltage circuit, releasing of signal transmission and electric charge, the charge and discharge circuit of rear class realizes the phase shortage of three-phase alternating current input and the continuous sweep of low pressure by discharging and recharging of electric charge, and then realize working alone of three groups of charge and discharge circuit and export the charging voltage signal by buffer circuit, finally by output circuit relatively, described charging voltage signal and given reference voltage are compared, the normal signal of output three-phase alternating current input voltage, phase shortage and low-voltage signal, phase shortage and the low-voltage detection function of three-phase alternating current have been realized.
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 is from described this cross streams input, through described rectification circuit, current-limiting circuit, amplitude limiter circuit, to described optical coupling isolation circuit, finally turn back to this cross streams input; In the situation that any phase shortage that occurs mutually of three-phase alternating current input, due to outage, optical coupling isolation circuit has just stopped work; In addition, in the situation that any low pressure that occurs mutually of three-phase alternating current input, due to the clamped effect of amplitude limiter circuit, so the voltage of current-limiting circuit output can not pass through amplitude limiter circuit and arrive optical coupling isolation circuit, causes optical coupling isolation circuit also to stop work; Only at three-phase alternating voltage all in normal situation, the voltage of current-limiting circuit output 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, the detection path when having formed any phase of three-phase alternating current input or two-phase or three-phase and phase shortage or low pressure occurring, these three paths are all to converge from the three-phase alternating current input and in the output of buffer circuit; As long as any phase shortage or low pressure of occurring mutually, buffer circuit all can be exported the voltage (high level) of accessory power supply, input to the comparison output circuit, and with lower reference voltage, compare output 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, during work, and the mode of this path to charge, 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 conducting work, 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 any is while phase shortage or low pressure occurring 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 until electric charge be full of.
Of the present invention one specifically for the phase shortage of three-phase three-wire system alternating current 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 line block diagrams 100) and the output comparator circuit, three-phase alternating current is input as UV phase, VW phase and UW phase, this three-phase alternating current is input to respectively three groups of phase detecting circuit PHSDT, and then by three groups of PHSDT continuous detecting, is gone out phase shortage and the low-pressure state of every phase voltage; 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, reaches accessory power supply VCC;
Implementation structure and the function of each parts of the present embodiment are respectively described below:
in the identical phase detecting circuit PHSDT of three groups of structures of the present embodiment, 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 the 4N25 optical coupling isolator, by light emitting diode and output triode, formed), charge and discharge circuit is by charging resistor R2, charging and discharging capacitor C 1, optical coupling isolator N1 and accessory power supply VCC(adopt LM7812) form, and buffer circuit is comprised of isolating diode D2, wherein the anodic bonding of the diode D1 of rectification circuit is to exchanging 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, having formed the high-pressure side phase shortage and the low pressure that exchange input UV phase detects, the collector 140 of optical coupling isolator N1 output triode respectively with charging resistor R2, charging and discharging capacitor C 1 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 capacitor C 1 is held GND with being connected to, cathode terminal 150 output charging voltages by isolating diode D2.
Described commutation diode D1 is for carrying out mutually half-wave rectification to exchanging input UV, and output half-wave high voltage direct current is to 110 ends; Because interchange is input as the symmetrical sine ripple, so as long as the half-wave sampling just can detect phase shortage and the low pressure that exchanges input; In addition, diode D1 is bearing the high back voltage that exchanges input UV phase, and protection optical coupling isolator N1 is not by this high-voltage breakdown;
Described current-limiting resistance R1 carries out current limliting for the high voltage direct current to 110 ends, and the while is with the work of light emitting diode in suitable current drives optical coupling isolator N1;
Described amplitude limit voltage stabilizing diode V1 carries out clamped for the high voltage direct current to current-limiting resistance R1 output terminal 120, the phase shortage and the low pressure that realize UV cross streams electricity detect, when interchange input UV phase shortage occurs mutually, UV cuts off the power supply mutually, optical coupling isolator N1 will quit work, perhaps when the high-voltage dc voltage of 120 ends during lower than this clamped voltage, 130 ends are 0 with the voltage that exchanges input V end, optical coupling isolator N1 will quit work, at this moment, the voltage of 140 ends slowly is charged to VCC, and outputs to 150 ends by isolating diode D2, and this moment, 150 ends were high level; When the 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 luminous, and then the triode conducting that drives in optical coupling isolator N1 is worked, electric charge on C1 was released by the triode moment in N1, and the voltage of 140 ends is the 0(low level);
Described optical coupling isolator N1 is for the electrical isolation of the high-tension circuit of realizing exchanging input UV phase and rear class low-voltage circuit R2, C1, D2 etc.; And the signal transmission that realizes exchanging normal condition, phase shortage and the low-pressure state of inputting the UV phase voltage, when having phase shortage and low pressure, light emitting diode no-voltage in N1, not luminous, so the triode in N1 by, when interchange input UV phase voltage is normal, the triode conducting work in the lumination of light emitting diode in N1 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 phase shortage to exchanging input UV phase and the scanning of low pressure, detect, comprise charging circuit and discharge circuit, charging circuit is comprised of accessory power supply VCC, charging resistor R2 and charging capacitor C1, when phase shortage and low pressure appear in interchange input UV mutually, in optical coupling isolator N1 triode by, at this moment, accessory power supply VCC will slowly charge to capacitor C 1 by charging resistor R2, until be full of, the voltage on 140 ends reaches the VCC(high level), discharge circuit is comprised of discharge capacity C1 and optical coupling isolator N1, when interchange input UV phase voltage is normal, the triode conducting 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 the 0(low level), described scanning detects, comprising intermittent scanning detection and continuous sweep detects, intermittent scanning detects and refers to the sine wave of each interchange incoming frequency in the cycle, all exist charging circuit VCC by R2 to the slow charging process of capacitor C 1 and the process that sparks of discharge circuit C1 and N1, when UV cross streams input voltage is normal, because 110 ends are the half-wave sine wave, so in a frequency period, the voltage of 120 ends is within the time lower than the clamped voltage of V1, optical coupling isolator N1 will quit work, charging circuit namely slowly charges to capacitor C 1, and at sine voltage in the time higher than the clamped voltage of V1, triode in optical coupling isolator N1 is by conducting work, discharge circuit namely sparks to capacitor C 1, at one, exchange incoming frequency in the cycle like this, on the capacitor C 1 of 140 ends, can not set up effective voltage (low level), and by isolating diode D2 this Voltage-output to 150 ends, realized that the intermittent scanning that exchanges in the incoming frequency cycle detects, continuous sweep detects and refers to the continuous detecting sine voltage in each interchange incoming frequency cycle, when the phase shortage that some cycles occur and low pressure or long-term phase shortage and low pressure, optical coupling isolator N1 namely quits work, capacitor C 1 is by trickle charge, until reach accessory power supply voltage VCC(high level), voltage on 140 ends and 150 ends becomes high level, has realized that the continuous sweep of 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 charging voltage on 140 ends is exported to the comparison output circuit on 150 ends, because the sequential and the 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 and crosstalked, and exported that the highest charging voltage in three groups of PHSDT;
The described circuit 100 of the present embodiment forms phase shortage and the low pressure detection path of an on high-tension side interchange 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, in the situation that exchange input UV phase phase shortage, due to outage, optical coupling isolator N1 has just stopped work, and the triode in N1 is in by state; In addition, in the situation that exchange input UV phase low pressure, due to the clamped effect of limiter diode V1, so optical coupling isolator N1 has also stopped work, the triode in N1 also is in by state; Only exchanging in the normal situation of input UV phase voltage, optical coupling isolator N1 just works, and the triode in N1 is in conducting state;
The described circuit 100 of 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 just slowly charges to capacitor C 1 by resistance R 2, until be full of, voltage reaches accessory power supply voltage VCC(high level);
The described circuit 100 of the present embodiment forms a discharge path simultaneously, this path is from the triode in capacitor C 1, optical coupling isolator N1, to the ground GND of accessory power supply VCC, when interchange input UV phase voltage is normal, triode conducting in N1, the instantaneous GND(low level of releasing of the triode of the electric charge on capacitor C 1 in N1);
The output comparator circuit of the present embodiment adopts the LM393 comparer by comparer N2(), voltage reference V2 and accessory power supply VCC form, wherein, voltage reference V2 is connected to the input end of comparer N2, the benchmark voltage of device N2 as a comparison, 150 ends are another input of device N2 as a comparison, when 150 terminal voltages (during high level) surpass V2 voltage, at 160 ends of comparer N2, export phase shortage and the low-voltage signal of UV phases; When 150 terminal voltages (during low level) during lower than V2 voltage, in the 160 ends output UV phase voltage normal signal of comparer N2.
the present embodiment is with three identical phase detecting circuit PHSDT, form the three-phase alternating current input and (comprised the UV phase, the VW phase, the UW phase) any phase in, or two-phase, or the detection MP major path of three-phase while phase shortage or low pressure occurring, these three paths are all to 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 output 150 ends, as long as any phase shortage or low pressure of occurring mutually, circuit 100 all can be exported accessory power supply VCC voltage (high level), be input to comparer N2, and compare with lower reference voltage V 2, at comparer N2 output 160 end output phase shortage and low-voltage signals.
Adopt three-phase four-wire system of the present invention to exchange the phase shortage of three-phase alternating current of input and low-voltage testing circuit structured flowchart 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 equally the phase detecting circuit PHSDT of three groups of same structures and compares output circuit, described three groups of phase detecting circuit parallel connections, 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 respectively phase shortage and the low pressure of this cross streams input; After the output terminal interconnection of three groups of phase detecting circuits, with the input end that compares output circuit, be connected, relatively output circuit output detections result; Described each group phase detecting circuit, comprise 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 same with low pressure detection method with the phase shortage of three-phase three-wire system alternating current, phase shortage and low pressure that the present invention is applicable to the three-phase four-wire system alternating current fully detect.
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, adopt the present invention can detect phase shortage and the low pressure that exchanges any phase, two-phase or three-phase in input.
What need statement is; the phase shortage of three-phase alternating current described above and low-voltage testing circuit; the phase shortage and the low-voltage testing circuit that comprise the alternating current of any phase; and the application that relates to this type of; be only to illustrate as of the present invention, other relates to according to the present invention that being equal to of institute's resist technology scheme in the claims replaces and within the circuit of conversion all should covered in protection scope of the present invention.
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 circuit parallel connections, 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 respectively phase shortage and the low pressure of this cross streams input; After the output terminal interconnection of three groups of phase detecting circuits, with the input end that compares output circuit, be connected, relatively output circuit output detections result; Described each group phase detecting circuit, comprise 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:
Described rectification circuit, for tested electrical network three-phase alternating current input is carried out to rectification, is high voltage direct current by the high-voltage alternating electric rectification;
Described current-limiting circuit, carry out current limit for the high voltage direct current to rectification circuit output, is convenient to drive the optical coupling isolation circuit normal operation;
Described amplitude limiter circuit, carry out clampedly for the high voltage direct current to current-limiting circuit output, realize that the phase shortage of this cross streams electricity and low pressure detect;
Described optical coupling isolation circuit, be used to the high-tension circuit of realizing the input of this cross streams and the electrical isolation of rear class low-voltage circuit; And, realize effective transmission of this cross streams electricity work state; Simultaneously, realize the discharging function of charge and discharge circuit;
Described charge and discharge circuit, scanning for the phase shortage to this cross streams electricity and low-voltage signal detects, 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, will trigger relatively output circuit therebetween, and output phase shortage and low-voltage signal; Discharge circuit wherein, refer to that optical coupling isolation circuit will be opened work when this cross streams input voltage is normal, the electric charge of the instantaneous charging circuit of releasing of discharge circuit, so that charging circuit can not set up effective charging voltage, charge and discharge circuit output low level at this moment;
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 the comparison output circuit, when high level appears in charge and discharge circuit, buffer circuit is exported high level signal, otherwise buffer circuit output low level signal;
Described relatively output circuit, for the voltage of three buffer circuit outputs to three groups of phase detecting circuits and the reference voltage of setting, compare, and output comparative result, with this, determine that three-phase alternating current is normal condition, or phase shortage and low-pressure state, during and if only if three groups of equal output low level signals of phase detecting circuit, the output circuit normal signal of output AC input just relatively.
2. circuit as claimed in claim 1, it is characterized in that, described circuit forms phase shortage and the low pressure detection path of three identical on high-tension side three-phase alternating current inputs, every path is from this cross streams input, through described rectification circuit, current-limiting circuit, amplitude limiter circuit, to described optical coupling isolation circuit, finally turn back to this cross streams input; Described three identical phase detecting circuits, the detection path when having formed any phase of three-phase alternating current input or two-phase or three-phase and phase shortage or low pressure occurring, this three paths are all to converge from the three-phase alternating current input and in the output of buffer circuit; As long as any phase shortage or low pressure of occurring mutually, buffer circuit all can be exported the voltage of accessory power supply, inputs to the comparison output circuit, and with lower reference voltage, compares output phase shortage and low-voltage signal.
3. circuit as claimed in claim 1, is characterized in that, described circuit also forms a charging path, this path is from described accessory power supply to charging circuit, and during work, this path is in the mode of charging, continuous sweep, until be full of, voltage reaches accessory power supply voltage; Described circuit forms a discharge path simultaneously, and this path is from charge and discharge circuit, to optical coupling isolation circuit, and when this cross streams input voltage is normal, optical coupling isolation circuit conducting work, 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 any be while phase shortage or low pressure occurring mutually, in the phase detecting circuit of this phase, optical coupling isolation circuit quits work, charging process until electric charge be full of.
4. 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) that consists 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) form, and buffer circuit adopts isolating diode (D2) to form, wherein the anodic bonding of the diode of rectification circuit (D1) is to every cross streams input end, the negative electrode of the diode of rectification circuit (D1) 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 every cross streams input, 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, cathode terminal output charging voltage by isolating diode (D2).
5. circuit as claimed in claim 1, it is characterized in that, described output comparator circuit is comprised of comparer (N2), voltage reference (V2) and accessory power supply (VCC), wherein, voltage reference (V2) is connected to an input end of comparer (N2), the benchmark voltage of device (N2) as a comparison, when another input end (150) voltage of comparer (N2) surpasses voltage reference (V2) voltage, phase shortage and the low-voltage signal of comparer (N2) output UV phase; When another input end (150) voltage of comparer (N2) during lower than voltage reference (V2) voltage, comparer (N2) output UV phase voltage normal signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104215825A (en) * | 2014-08-20 | 2014-12-17 | 国家电网公司 | Comprehensive online monitoring system for power transformer |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63298168A (en) * | 1987-05-29 | 1988-12-05 | Mitsubishi Electric Corp | Current detector |
| US5512849A (en) * | 1993-04-30 | 1996-04-30 | North American Philips Corporation | Low power intelligent current source for monitoring a high voltage |
| JP2005017111A (en) * | 2003-06-26 | 2005-01-20 | Yaskawa Electric Corp | Power failure detection circuit |
| CN102621404A (en) * | 2012-03-27 | 2012-08-01 | 厦门科华恒盛股份有限公司 | Lacking phase detecting circuit for three-phase voltage of system without zero lines |
| CN103197158A (en) * | 2013-03-26 | 2013-07-10 | 深圳市英威腾电气股份有限公司 | Three-phase power grid phase loss detection method and circuit |
-
2013
- 2013-07-26 CN CN201310319361.8A patent/CN103399215B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63298168A (en) * | 1987-05-29 | 1988-12-05 | Mitsubishi Electric Corp | Current detector |
| US5512849A (en) * | 1993-04-30 | 1996-04-30 | North American Philips Corporation | Low power intelligent current source for monitoring a high voltage |
| JP2005017111A (en) * | 2003-06-26 | 2005-01-20 | Yaskawa Electric Corp | Power failure detection circuit |
| CN102621404A (en) * | 2012-03-27 | 2012-08-01 | 厦门科华恒盛股份有限公司 | Lacking phase detecting circuit for three-phase voltage of system without zero lines |
| CN103197158A (en) * | 2013-03-26 | 2013-07-10 | 深圳市英威腾电气股份有限公司 | Three-phase power grid phase loss detection method and circuit |
Non-Patent Citations (2)
| Title |
|---|
| 李振军: "三相交流电相序控制电路", 《郑州纺织工学院学报》, vol. 9, 30 April 1998 (1998-04-30), pages 183 - 184 * |
| 蔡茗名 等: "三相交流电相位检测系统的设计与研究", 《信息技术》, no. 7, 31 December 2011 (2011-12-31), pages 77 - 80 * |
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| CN105141298A (en) * | 2014-06-03 | 2015-12-09 | 北京动力源科技股份有限公司 | Single-phase power switch control circuit and AC power supply system with 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 |
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