CN201955399U - Three-phase-current phase-lacking detection circuit - Google Patents

Three-phase-current phase-lacking detection circuit Download PDF

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Publication number
CN201955399U
CN201955399U CN2011200221379U CN201120022137U CN201955399U CN 201955399 U CN201955399 U CN 201955399U CN 2011200221379 U CN2011200221379 U CN 2011200221379U CN 201120022137 U CN201120022137 U CN 201120022137U CN 201955399 U CN201955399 U CN 201955399U
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resistance
circuit
voltage
diode
output
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CN2011200221379U
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Chinese (zh)
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张健飞
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FANS-TECH ELECTRIC CO., LTD.
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FOSHAN SHUNDE FANS-TECH ELECTRIC Co Ltd
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Abstract

The utility model relates to a three-phase-current phase-lacking detection circuit which is characterized by comprising a rectification circuit, a voltage sampling circuit, a comparison circuit, a signal transformation circuit and an output circuit, wherein the rectification circuit rectifies input three-phase-current voltage into impulse direct-current voltage; the voltage sampling circuit is used for receiving the impulse direct-current voltage output by the rectification circuit and sampling the voltage; the comparison circuit is used for receiving the voltage output by the voltage sampling circuit and comparing the voltage; the signal transformation circuit is used for receiving an electric signal output by the compassion circuit and carrying out signal transformation; and the output circuit is used for receiving an electric signal output by the signal transformation circuit and sending out the signal. The three-phase-current phase-lacking detection circuit has the advantages that the circuit is simple, the input voltage range is a wide, the generality is strong, the influence of voltage fluctuation can be avoided, the phase lack of a power supply can be detected accurately, and the like.

Description

The three-phase alternating current lack detection circuit
Technical field
The utility model relates to a kind of three-phase alternating current lack detection circuit.
Background technology
Traditional three-phase alternating current lack detection circuit, a kind of method is: three-phase and four-line could detect, and except that three live wires of need, a zero line need be arranged also that is:; Another kind method is a three-phase three-wire system, needs to use a plurality of comparing units, circuit complexity, cost height; Simultaneously the detection voltage range of above-mentioned two kinds of methods is narrow, all can be because of the fluctuation of voltage, and the output error testing result.
Summary of the invention
The purpose of this utility model is in order to overcome the deficiencies in the prior art, provides that a kind of circuit is simple, wide input voltage range, highly versatile, is not subjected to voltage fluctuation, can accurately detects the three-phase alternating current lack detection circuit of power supply phase shortage.
In order to achieve the above object, the utility model is achieved in that it is one one kinds of three-phase alternating current lack detection circuits, is characterized in that: comprise that the three-phase alternating voltage with input is rectified into the rectification circuit of pulsating dc voltage; Also comprise pulsating dc voltage that receives rectification circuit output and the voltage sample circuit that carries out voltage sampling; Also comprise voltage that receives voltage sample circuit output and the comparator circuit that compares; Also comprise electric signal that receives comparator circuit output and the signaling conversion circuit that carries out conversion of signals; Also comprise the electric signal of received signal change-over circuit output and the output circuit that signal is exported.
Described rectification circuit comprises connectivity port, first diode, second diode, the 3rd diode, the 4th diode, the 5th diode, the 6th diode; The positive pole of first, second and third diode is connected to respectively on three terminals in connectivity port, and negative pole connects together and exports positive pulsating dc voltage; Fourth, fifth, the positive pole of the six diodes signal ground of parallelled circuit that connects together, the 4th diode cathode is connected to the positive pole of the 3rd diode, and the negative pole of the 5th diode is connected to the positive pole of second diode, and the negative pole of the 6th diode is connected to first diode cathode.
Described voltage sample circuit comprises first resistance, second resistance, the 3rd resistance, the output terminal of first resistance, one termination rectification circuit, one end of another termination second resistance, an end of another termination the 3rd resistance of second resistance and the input end of comparator circuit, another termination signal ground of the 3rd resistance.
Described comparator circuit comprises the 4th resistance, the 5th resistance, comparing element; The 4th resistance one termination power end, the input end of another termination the 5th resistance one end and comparing element, another termination signal ground of the 5th resistance; Comparing element one is terminated at the output terminal of voltage sample circuit, the input end of output termination signaling conversion circuit.
Described signaling conversion circuit comprises the 6th resistance, the 7th resistance, the 8th resistance, first electric capacity and converting unit; One termination power end of the 6th resistance, connect the conversion unit an end, an end of another termination the 7th resistance, an end of first electric capacity and the output terminal of comparator circuit; Another termination signal ground end of the 7th resistance, an end of the other end of this termination converting unit and the 8th resistance simultaneously; The other end of another termination the 8th resistance of first electric capacity and the input end of converting unit.
Described output circuit comprises the 9th resistance, the tenth resistance and second electric capacity; The 9th resistance one termination power end, another termination the tenth resistance one end, an end of second electric capacity and the output terminal of signaling conversion circuit; The tenth resistance other end and the second electric capacity other end also connect the signal ground end.
The utility model beneficial effect compared with prior art is:
Rectification circuit is rectified into the voltage of dc pulse with three-phase alternating voltage, realizes the circuit that three-phase and four-line or phase three-wire three all can detect, and realizes the versatility of circuit; Voltage sample circuit is converted to the dc pulse moving voltage of low pressure with the high voltage direct current pulsating volage after the rectification, realizes providing safe detection voltage; Comparator circuit with the reference voltage of dc pulse moving voltage and setting relatively, output square wave during the power supply phase shortage, the dutycycle of square wave changes with mains voltage variations, output DC is not flat during phase shortage, realizes the whether detection of phase shortage of AC power; The square-wave signal of the different dutycycle when signaling conversion circuit is realized phase shortage converts single signal level output to, realizes the detection of wide-voltage range; Output circuit is realized the output filtering with signaling conversion circuit, and steadily output level makes the back level use circuit steadily to detect.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is done further detailed description:
As shown in Figure 1, it is a kind of three-phase alternating current lack detection circuit, and characteristics of the present utility model are: comprise the rectification circuit 1 that three-phase alternating voltage is rectified into the DC voltage of pulsation; Also comprise pulsating dc voltage that receives rectification circuit output and the voltage sample circuit 2 that carries out voltage sampling; Also comprise voltage that receives voltage sample circuit output and the comparator circuit 3 that compares; Also comprise electric signal that receives comparator circuit output and the signaling conversion circuit 4 that carries out conversion of signals; Also comprise the signal of received signal change-over circuit output and the output circuit 5 that signal is exported.
In the present embodiment, rectification circuit 1 comprises connectivity port S1, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6; First, second and third diode D1, D2, D3 positive pole are connected on three terminals of connectivity port S1, and negative pole connects together and exports positive pulsating dc voltage; Fourth, fifth, six diode D4, D5, the D6 positive pole signal ground GND of parallelled circuit that connects together, the 4th diode D4 negative pole is connected to the positive pole of the 3rd diode D3, the negative pole of the 5th diode D5 is connected to the positive pole of the second diode D2, and the negative pole of the 6th diode D6 is connected to the first diode D1 positive pole.During work, three-phase alternating current is rectified into the pulsafeeder of direct current through first, second and third diode D1, D2, D3, and circuit is got back to AC power by fourth, fifth, six diode D4, D5, D6 more after testing.
Voltage sample circuit 2 comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the output terminal of first resistance R, 1 one termination rectification circuits 1 i.e. the negative pole of the first diode D1, another termination second resistance R 2 one ends, another termination the 3rd resistance R 3 one ends and comparator circuit 3 one ends of second resistance, the 3rd resistance R 3 another termination signal grounds.During work, high voltage direct current pulsating volage after rectification circuit 1 rectification after first resistance R 1, second resistance R, 2 serial connections, is connected in series with the 3rd resistance R 3 again, from the dc pulse moving voltage of the 3rd resistance R 3 output low pressure, for back grade comparator circuit 3 provides safe signal voltage.When phase shortage occurring as power supply, will a lower pulsating volage appear by the frequency of 15 times of power supply.
Comparator circuit 3 comprises the 4th resistance R 4, the 5th resistance R 5, comparing element U1; The 4th resistance R 4 one termination power Vcc end, the input end of another termination the 5th resistance R 5 one ends and comparing element U1; The 5th resistance R 5 another termination signal ground GND; Comparing element U1 one is terminated at the output terminal of voltage sample circuit 2, and this end is the series connection point of second resistance and the 3rd resistance, the input end of the output termination signaling conversion circuit 4 of comparing element U1, and the model of comparing element U1 is LM211PWR.During work, comparing unit U1 is according to the partial pressure value of the 4th resistance R 4 and 5 pairs of power supplys of the 5th resistance R, the dc pulse moving voltage of the low pressure that provides with voltage sample circuit 2 relatively again, when phase shortage occurring as power supply, comparator circuit will be exported a square wave, otherwise be output as single high level.
Signaling conversion circuit 4 comprises the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, first capacitor C 1, converting unit U2; The one termination power Vcc end of the 6th resistance R 6 and the end of converting unit U2, an end of another termination the 7th resistance R 7 and an end of first capacitor C 1, this termination converting unit U2 is the output terminal of comparing element U1 simultaneously; Another termination signal ground GND end of the 7th resistance R 7; The other end of first capacitor C 1 connects the input end of conversion unit U2 and an end of the 8th resistance, and the 8th resistance R 8 other ends meet an end and the signal ground GND of conversion unit U2, and the model of converting unit U2 is MS3729.During work, phase shortage do not occur as power supply, signaling conversion circuit is output as single low level; When phase shortage appearred in power supply, signaling conversion circuit was output as high level.
Output circuit 5 comprises the 9th resistance R 9, the tenth resistance R 10 and second capacitor C 2; The 9th resistance R 9 one termination power end Vcc, an end of another termination the tenth resistance R 10 1 ends and second capacitor C 2, this end also connect the output terminal of conversion unit U2; The tenth resistance R 10 other ends and second capacitor C, 2 other ends are attempted by the signal ground end.During work, phase shortage do not occur as power supply, signaling conversion circuit is output as single low level, because of the tenth resistance R 10 and second capacitor C, 2 ground connection in parallel, is output as low level stably; Phase shortage occurs as power supply, the high level of signaling conversion circuit output is received power end through the 9th resistance R 9, and second capacitor C, 2 ground connection in parallel are exported high level stably simultaneously.Detect use for late-class circuit.

Claims (6)

1. a three-phase alternating current lack detection circuit is characterized in that: comprise that the three-phase alternating voltage with input is rectified into the rectification circuit (1) of pulsating dc voltage; Also comprise pulsating dc voltage that receives rectification circuit output and the voltage sample circuit (2) that carries out voltage sampling; Also comprise voltage that receives voltage sample circuit output and the comparator circuit (3) that compares; Also comprise electric signal that receives comparator circuit output and the signaling conversion circuit (4) that carries out conversion of signals; Also comprise the electric signal of received signal change-over circuit output and the output circuit (5) that signal is exported.
2. three-phase alternating current lack detection circuit according to claim 1 is characterized in that: described rectification circuit (1) comprises connectivity port (S1), first diode (D1), second diode (D2), the 3rd diode (D3), the 4th diode (D4), the 5th diode (D5), the 6th diode (D6); The positive pole of first, second and third diode is connected to respectively on three terminals in connectivity port (S1), and negative pole connects together and exports positive pulsating dc voltage; Fourth, fifth, the positive pole of the six diodes signal ground of parallelled circuit that connects together, the 4th diode (D4) negative pole is connected to the positive pole of the 3rd diode (D3), the negative pole of the 5th diode (D5) is connected to the positive pole of second diode (D2), and the negative pole of the 6th diode (D6) is connected to first diode (D1) positive pole.
3. three-phase alternating current lack detection circuit according to claim 1, it is characterized in that: described voltage sample circuit (2) comprises first resistance (R1), second resistance (R2), the 3rd resistance (R3), the output terminal of first resistance (R1) termination rectification circuit (1), one end of another termination second resistance (R2), one end of another termination the 3rd resistance (R3) of second resistance (R2) and the input end of comparator circuit (3), another termination signal ground of the 3rd resistance (R3).
4. three-phase alternating current lack detection circuit according to claim 1 is characterized in that: described comparator circuit (3) comprises the 4th resistance (R4), the 5th resistance (R5), comparing element (U1); The 4th resistance (R4) termination power (Vcc) end, the input end of another termination the 5th resistance (R5) end and comparing element (U1), another termination signal ground of the 5th resistance (R5); Comparing element (U1) one is terminated at the output terminal of voltage sample circuit (2), the input end of output termination signaling conversion circuit (4).
5. three-phase alternating current lack detection circuit according to claim 1 is characterized in that: described signaling conversion circuit (4) comprises the 6th resistance (R6), the 7th resistance (R7), the 8th resistance (R8), first electric capacity (C1) and converting unit (U2); An end of conversion unit (U2), an end of an end of another termination the 7th resistance (R7), first electric capacity (C1) and the output terminal of comparator circuit (3) are held, connect to one termination power (Vcc) of the 6th resistance (R6); Another termination signal ground end of the 7th resistance (R7), an end of the other end of this termination converting unit (U2) and the 8th resistance simultaneously; The other end of another termination the 8th resistance (R8) of first electric capacity (C1) and the input end of converting unit (U2).
6. three-phase alternating current lack detection circuit according to claim 1 is characterized in that: described output circuit (5) comprises the 9th resistance (R9), the tenth resistance (R10) and second electric capacity (C2); The 9th resistance (R9) termination power end (Vcc), an end of another termination the tenth resistance (R10) end, second electric capacity (C2) and the output terminal of signaling conversion circuit (4); The tenth resistance (R10) other end and second electric capacity (C2) other end also connect the signal ground end.
CN2011200221379U 2011-01-24 2011-01-24 Three-phase-current phase-lacking detection circuit Expired - Lifetime CN201955399U (en)

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Application Number Priority Date Filing Date Title
CN2011200221379U CN201955399U (en) 2011-01-24 2011-01-24 Three-phase-current phase-lacking detection circuit

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102426302A (en) * 2011-09-15 2012-04-25 广州三晶电气有限公司 Three-phase power input open-phase detection circuit
CN105372480A (en) * 2015-11-17 2016-03-02 上海控源电子科技有限公司 Over voltage, under voltage and phase failure detection circuit for charging pile
CN111999568A (en) * 2020-09-17 2020-11-27 杭州益川电子有限公司 Three-phase input open-phase detection system for variable frequency driver
CN113189410A (en) * 2021-04-02 2021-07-30 深圳市力源海纳能源有限公司 Low-cost quick three-phase alternating current phase-lack detection circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102426302A (en) * 2011-09-15 2012-04-25 广州三晶电气有限公司 Three-phase power input open-phase detection circuit
CN102426302B (en) * 2011-09-15 2013-12-04 广州三晶电气有限公司 Three-phase power input open-phase detection circuit
CN105372480A (en) * 2015-11-17 2016-03-02 上海控源电子科技有限公司 Over voltage, under voltage and phase failure detection circuit for charging pile
CN111999568A (en) * 2020-09-17 2020-11-27 杭州益川电子有限公司 Three-phase input open-phase detection system for variable frequency driver
CN113189410A (en) * 2021-04-02 2021-07-30 深圳市力源海纳能源有限公司 Low-cost quick three-phase alternating current phase-lack detection circuit

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C56 Change in the name or address of the patentee
CP03 Change of name, title or address

Address after: 528300 Guangdong, Foshan, Shunde District, Daliang street, Sha Shun Road, No. five, No. 9, No. two

Patentee after: FANS-TECH ELECTRIC CO., LTD.

Address before: 528300 Shunde District, Guangdong City, Foshan province Daliang five sand Shun Cheng South Road

Patentee before: Foshan Shunde Fans-Tech Electric Co., Ltd.

CX01 Expiry of patent term

Granted publication date: 20110831

CX01 Expiry of patent term