CN202217019U - Three-phase supply input open phase detection circuit - Google Patents
Three-phase supply input open phase detection circuit Download PDFInfo
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- CN202217019U CN202217019U CN 201120344851 CN201120344851U CN202217019U CN 202217019 U CN202217019 U CN 202217019U CN 201120344851 CN201120344851 CN 201120344851 CN 201120344851 U CN201120344851 U CN 201120344851U CN 202217019 U CN202217019 U CN 202217019U
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Abstract
The utility model discloses a three-phase supply input open phase detection circuit, comprising a first current-limiting resistor, a second current-limiting resistor, a third current-limiting resistor, a pull-up resistor, a first diode, a second diode, a third diode, a first capacitor, a second capacitor, an optical coupler and a triode, wherein the first current-limiting resistor, the second current-limiting resistor and the third current-limiting resistor are respectively connected to a first phase line, a second phase line and a third phase line; the pull-up resistor is connected to an open phase detection circuit output end; the anode of the first diode is connected to the first current-limiting resistor; the anode of the second diode is connected to the second current-limiting resistor; the cathode of the third diode is connected to the third current-limiting resistor; the first capacitor is connected with the cathode of the first diode and the anode of the third diode in series; the second capacitor is connected with the cathode of the second diode and the anode of the third diode in series; the collector of the output end of the optical coupler is connected with the pull-up resistor and the emitter of the output end of the optical coupler is connected with a signal ground; and the collector of the triode is connected with the cathode of the input end of the optical coupler, the base of the triode is connected with the cathode of the second diode, and the emitter of the triode is connected with the anode of the third diode. The circuit overcomes the defects of the existing circuit that the cost is high, the energy consumption is large, the reliability is low, and the service life is short.
Description
Technical field
The utility model relates to the frequency converter field, particularly a kind of three-phase power input phase-loss detection circuit.
Background technology
Frequency control has become the mode of speed regulation of main flow; And frequency converter is as its governing system core; In recent years along with the raising of technological requirement and energy-conservation requirement; Frequency converter is able to widespread use in industrial control field is used, guarantee that frequency converter reliably, work safely, need provide kinds of protect to frequency converter.The input open-phase protection circuit is used widely in frequency converter as holding circuit the most frequently used and important in the frequency converter.
As shown in Figure 1, be the synoptic diagram of general frequency converter open-phase protection circuit.Three resistance (R1-R3) that link to each other with three-phase input end are used for three-phase supply input is carried out current limliting, and six diodes (D1-D6) are formed three-phase full wave rectifier circuit; Optocoupler U1 realizes that the isolation of input default phase signal transmits, and when the output current of three-phase full wave rectifier circuit is zero, ends, and this moment, the output terminal PL of phase shortage circuit was a high level; Conducting when three-phase full wave rectifier circuit output current non-zero, this moment, phase shortage circuit output end PL was a low level.
When the three-phase of frequency converter was imported not phase shortage, the electric current that three phase full wave rectification is partly exported was a direct current that is superimposed with fifth overtone, and zero crossing not.Optocoupler U1 this moment conducting always, the constant low level signal of circuit output is delivered to the control and the holding circuit of frequency converter.When control circuit receives continuous low level signal, be zero, judge that the power supply input state is non-full-phase state not through calculating the square-wave pulse number.When the three-phase input phase shortage of frequency converter; Three-phase full wave rectifier circuit is output as the pulsating direct current that frequency is a twice input supply frequency; And this current zero-crossing point; Thereby optocoupler U1 switches between conducting and cut-off state, and the square-wave signal of circuit output one-period property is delivered to the control and the holding circuit of frequency converter.When control circuit receives periodic square-wave signal; Whether be equal to or greater than setting pulse number (this pulse number is set according to the power supply incoming frequency) through calculating the square-wave pulse number; Thereby judge that whether power supply import phase shortage; Promptly when the square-wave pulse number is equal to or greater than the setting pulse number, judge power supply input phase shortage; Otherwise the judgement power supply is imported not phase shortage.
Because above-mentioned lack detection circuit adopts way of full-wave rectification, when three-phase is imported not phase shortage, the three-phase current-limiting resistance all will have electric current to flow through in the whole cycle; And produce loss above that; Heating is serious, and circuit reliability is reduced, and when using for a long time; Resistance very likely damages because of loss is excessive, and circuit lifetime is reduced.Find that through electromagnetic compatibility test above-mentioned lack detection circuit anti-interference is poor, occur the wrong report open-phase fault easily, the equipment that can not guarantee is the work of normal reliable ground under abominable electromagnetic environment.
Fig. 2 be on April 22nd, 2009 disclosed publication number be that CN101413975A (number of patent application is 200710124003.6) denomination of invention is a kind of circuit diagram of three-phase power input phase-loss detection circuit.The resistance R 1, R2, the R3 that are connected with three-phase input end play metering function, and diode D1, D3 are used for R, the alternate half-wave rectification of carrying out of T, when the optocoupler U1 conducting during greater than the T phase voltage of R phase voltage; Diode D2, D3 are used for S, the alternate half-wave rectification of carrying out of T, when S greater than T phase time optocoupler U2 conducting.
When three-phase is imported not phase shortage; Intermittently conducting of the first optocoupler U1 and the second optocoupler U2; Thereby the output terminal of testing circuit output square wave (when R mutually with S phase voltage amplitude all greater than T mutually during amplitude, the first optocoupler U1 and second all conductings of optocoupler U2, the output terminal output low level 0V of testing circuit; Otherwise at least one not conducting among the first optocoupler U1 and the second optocoupler U2, the output terminal output high level of testing circuit); When three-phase input phase shortage, the first optocoupler U1 and the second optocoupler U2 have a not conducting or not conductings at least, and this moment, the output terminal of testing circuit was exported high level (5V) always.Level through judging the output of testing circuit output terminal can judge whether phase shortage, i.e. judge phase shortage during testing circuit output high level; Otherwise judge not phase shortage.
Because this circuit uses two optocouplers that input voltage is detected, circuit cost is higher; And because itself there is the conduction voltage drop about 0.7V in common optocoupler; When all still there is higher pressure drop in two optocoupler output terminals between testing circuit output and the power supply ground during conducting; Output low level reliably, make occasion at some low voltage power supplies (as present be that its pin port voltage of control circuit of master chip is generally 3.3V with DSP), disturbed easily and mistake output; Or need level shifting circuit to be connected with governor circuit, increased the complicacy of circuit.
The utility model content
The shortcoming that the purpose of the utility model is to overcome prior art provides a kind of three-phase power input phase-loss detection circuit with not enough, improves the reliability of power supply input lack detection circuit, prolongs the serviceable life of circuit, reduces cost and energy consumption.
The purpose of the utility model realizes through following technical proposals:
Three-phase power input phase-loss detection circuit; Comprise first current-limiting resistance, second current-limiting resistance and the 3rd current-limiting resistance that are connected respectively to first phase line, second phase line and third phase line; Be connected to the pull-up resistor of the output terminal of lack detection circuit, anode is connected to first diode of first current-limiting resistance, and anode is connected to second diode of second current-limiting resistance; Negative electrode is connected to the 3rd diode of the 3rd current-limiting resistance; Be serially connected with first electric capacity of first diode cathode and the 3rd diode anode, be serially connected with second electric capacity of second diode cathode and the 3rd diode anode, the output terminal collector is connected in the optocoupler that pull-up resistor and output terminal emitter-base bandgap grading are connected in signal ground; Also comprise triode; The collector of said triode links to each other with the input end negative electrode of said optocoupler, and the base stage of triode links to each other with said second diode cathode, and the emitter-base bandgap grading of triode links to each other with said the 3rd diode anode.
Preferably; The utility model three-phase power input phase-loss detection circuit also comprises first protective resistance parallelly connected with said first electric capacity and second protective resistance parallelly connected with said second electric capacity, and said first protective resistance and second protective resistance also can use first voltage stabilizing diode and second voltage stabilizing diode to replace.
The utility model has following advantage and effect with respect to prior art:
1, because the utility model has only used an optocoupler, and peripheral cell is few, and circuit structure is simple, circuit cost is lower; Optocoupler needs bigger electric current to work reliably, and transistor base only needs very little Control current, therefore makes the loss on the current-limiting resistance littler; The output low level ability is stronger, and is stronger in low voltage power supply occasion adaptability.
2, the three-phase power input phase-loss detection circuit of the utility model output can be directly be connected with controller such as DSP, has simplified and being connected of control circuit, and it is strong that circuit is disturbed interference performance, the reliability height.
Description of drawings
Fig. 1 is the circuit diagram of existing three-phase power input phase-loss detection circuit;
Fig. 2 is that patent publication No. is the circuit diagram of the three-phase power input phase-loss detection circuit of CN101413975A;
Fig. 3 is the circuit diagram of first embodiment of the utility model three-phase power input phase-loss detection circuit;
Fig. 4 is the circuit diagram of second embodiment of the utility model three-phase power input phase-loss detection circuit;
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but the embodiment of the utility model is not limited thereto.
Embodiment one
As shown in Figure 3; It is the circuit diagram of the utility model three-phase power input phase-loss detection circuit; This lack detection circuit comprises the first current-limiting resistance R1, the second current-limiting resistance R2 and the 3rd current-limiting resistance R3 that is connected respectively to the first phase line R, the second phase line S and third phase line T; Be connected to the pull-up resistor R6 of the output terminal of lack detection circuit; Anode is connected to the first diode D1 of first current-limiting resistance, and anode is connected to the second diode D2 of second current-limiting resistance, and negative electrode is connected to the 3rd diode D3 of the 3rd current-limiting resistance; Be serially connected with first capacitor C 1 of first diode cathode and the 3rd diode anode; Be serially connected with second capacitor C 2 of second diode cathode and the 3rd diode anode, the output terminal collector is connected in the optocoupler U1 that pull-up resistor R6 and output terminal emitter-base bandgap grading are connected in signal ground, also comprises the triode Q1 that collector links to each other with the input end negative electrode of said optocoupler, base stage links to each other with said second diode cathode, emitter-base bandgap grading links to each other with said the 3rd diode anode.
When three-phase is imported not phase shortage; Intermittently conducting of triode Q1, thus make also intermittently conducting of optocoupler U1, and the output terminal PL output square wave of testing circuit is (when S phase voltage amplitude triode base emitter-base bandgap grading forward bias during greater than T phase amplitude; When R mutually with S phase voltage amplitude all greater than T mutually during amplitude; Triode Q1 conducting makes optocoupler U1 input end forward conduction, the output terminal PL output low level 0V of testing circuit; Otherwise triode Q1 and not conducting of optocoupler U1, the output terminal PL output high level of testing circuit); When three-phase input phase shortage, and not conducting of optocoupler (when scarce R phase time, optocoupler input end diode anode no-voltage, not conducting of optocoupler; When scarce S phase time, no-voltage between the transistor base emitter-base bandgap grading, triode ends, also not conducting of optocoupler; When scarce T phase time, triode emitter-base bandgap grading open circuit, triode ends, also not conducting of optocoupler), this moment, the output terminal PL of testing circuit exported high level (5V) always.Level through judging testing circuit output terminal PL output can judge whether phase shortage, i.e. judge phase shortage during testing circuit output high level; Otherwise judge not phase shortage.
The frequency of above lack detection circuit output square wave when three-phase is imported phase shortage not changes with the variation of input supply frequency, is generally (50-60) Hz.
Above-mentioned phase shortage circuit is compared with lack detection circuit shown in Figure 1; When three-phase is imported not phase shortage, only have as R and all mutually during amplitude, just understand with S phase voltage amplitude mutually in current-limiting resistance generation loss greater than T; Loss on the current-limiting resistance is greatly reduced, improved circuit reliability and serviceable life.Because the triode that adopts in the circuit is the current mode switch device; Has the good interference performance of disturbing; Find that through the EMC test above-mentioned lack detection circuit anti-interference is extremely strong, thereby the equipment that guaranteed is under abominable electromagnetic environment; Still can normal reliable ground work, and the situation of open-phase fault can not appear reporting by mistake.
Above-mentioned phase shortage circuit is compared with lack detection circuit shown in Figure 2, owing to only used an optocoupler, circuit cost is lower; Optocoupler needs bigger electric current to work reliably, and transistor base only needs very little Control current, therefore makes the loss on the current-limiting resistance littler; The output low level ability is stronger, and is stronger in low voltage power supply occasion adaptability, simplified and being connected of control circuit.
Embodiment two
As shown in Figure 4; Reliability for can better holding circuit can also comprise first protective resistance 1 parallelly connected with first electric capacity, is used to protect optocoupler U1, triode Q1; And second protective resistance 2 parallelly connected with second electric capacity; Be used to protect triode Q1, in practical implementation, first protective resistance, second protective resistance can replace with voltage stabilizing diode.
The foregoing description is the utility model preferred implementation; But the embodiment of the utility model is not restricted to the described embodiments; Other any do not deviate from change, the modification done under spirit and the principle of the utility model, substitutes, combination, simplify; All should be the substitute mode of equivalence, be included within the protection domain of the utility model.
Claims (3)
1. three-phase power input phase-loss detection circuit; Comprise first current-limiting resistance, second current-limiting resistance and the 3rd current-limiting resistance that are connected respectively to first phase line, second phase line and third phase line; Be connected to the pull-up resistor of the output terminal of lack detection circuit, anode is connected to first diode of first current-limiting resistance, and anode is connected to second diode of second current-limiting resistance; Negative electrode is connected to the 3rd diode of the 3rd current-limiting resistance; Be serially connected with first electric capacity of first diode cathode and the 3rd diode anode, be serially connected with second electric capacity of second diode cathode and the 3rd diode anode, and the output terminal collector is connected in the optocoupler that pull-up resistor and output terminal emitter-base bandgap grading are connected in signal ground; It is characterized in that: also comprise triode; The collector of said triode links to each other with the input end negative electrode of said optocoupler, and the base stage of triode links to each other with said second diode cathode, and the emitter-base bandgap grading of triode links to each other with said the 3rd diode anode.
2. three-phase power input phase-loss detection circuit according to claim 1 is characterized in that: also comprise first protective resistance parallelly connected with said first electric capacity and second protective resistance parallelly connected with said second electric capacity.
3. three-phase power input phase-loss detection circuit according to claim 1 is characterized in that: also comprise first voltage stabilizing diode parallelly connected with said first electric capacity and second voltage stabilizing diode parallelly connected with said second electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120344851 CN202217019U (en) | 2011-09-15 | 2011-09-15 | Three-phase supply input open phase detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120344851 CN202217019U (en) | 2011-09-15 | 2011-09-15 | Three-phase supply input open phase detection circuit |
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| Publication Number | Publication Date |
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| CN202217019U true CN202217019U (en) | 2012-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201120344851 Expired - Fee Related CN202217019U (en) | 2011-09-15 | 2011-09-15 | Three-phase supply input open phase detection circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749479A (en) * | 2013-12-30 | 2015-07-01 | 刘培 | Power supply phase failure detecting method and device for elevator |
| CN104820139A (en) * | 2014-01-30 | 2015-08-05 | 天津豪雅科技发展有限公司 | Three-phase power supply phase lack detection device |
| CN104865454A (en) * | 2014-01-15 | 2015-08-26 | 天津豪雅科技发展有限公司 | Three-phase power supply phase loss detection device |
| CN106207963A (en) * | 2016-08-30 | 2016-12-07 | 合肥智博电气有限公司 | The under-voltage phase-lacking protective device of electromagnetism voltage-stabilizing energy-saving device |
| CN106199225A (en) * | 2016-06-28 | 2016-12-07 | 苏州汇川技术有限公司 | Lack detection circuit |
| CN106645996A (en) * | 2016-08-12 | 2017-05-10 | 深圳市沃特玛电池有限公司 | Three-phase lacking phase detection circuit |
| CN106843447A (en) * | 2017-01-22 | 2017-06-13 | 卢杨 | A kind of power-saving circuit of electronic installation |
| CN107294403A (en) * | 2017-06-19 | 2017-10-24 | 上海电气富士电机电气技术有限公司 | A kind of three-phase input lack detection circuit |
| CN109655675A (en) * | 2019-01-30 | 2019-04-19 | 晟道科技石家庄有限公司 | A kind of charger phase three-wire three phase shortage decision circuitry |
-
2011
- 2011-09-15 CN CN 201120344851 patent/CN202217019U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749479A (en) * | 2013-12-30 | 2015-07-01 | 刘培 | Power supply phase failure detecting method and device for elevator |
| CN104749479B (en) * | 2013-12-30 | 2018-01-16 | 天津豪雅科技发展有限公司 | A kind of elevator supply open phase detection method and its detection means |
| CN104865454A (en) * | 2014-01-15 | 2015-08-26 | 天津豪雅科技发展有限公司 | Three-phase power supply phase loss detection device |
| CN104820139A (en) * | 2014-01-30 | 2015-08-05 | 天津豪雅科技发展有限公司 | Three-phase power supply phase lack detection device |
| CN106199225A (en) * | 2016-06-28 | 2016-12-07 | 苏州汇川技术有限公司 | Lack detection circuit |
| CN106199225B (en) * | 2016-06-28 | 2019-03-22 | 苏州汇川技术有限公司 | Lack detection circuit |
| CN106645996A (en) * | 2016-08-12 | 2017-05-10 | 深圳市沃特玛电池有限公司 | Three-phase lacking phase detection circuit |
| CN106207963A (en) * | 2016-08-30 | 2016-12-07 | 合肥智博电气有限公司 | The under-voltage phase-lacking protective device of electromagnetism voltage-stabilizing energy-saving device |
| CN106843447A (en) * | 2017-01-22 | 2017-06-13 | 卢杨 | A kind of power-saving circuit of electronic installation |
| CN107294403A (en) * | 2017-06-19 | 2017-10-24 | 上海电气富士电机电气技术有限公司 | A kind of three-phase input lack detection circuit |
| CN109655675A (en) * | 2019-01-30 | 2019-04-19 | 晟道科技石家庄有限公司 | A kind of charger phase three-wire three phase shortage decision circuitry |
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| C14 | Grant of patent or utility model | ||
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Address after: 510530 No. 17 incense Hill Road, science and Technology Town, Guangzhou hi tech Development Zone, Guangdong, China Patentee after: GUANGZHOU SANJING ELECTRIC CO., LTD. Address before: 510530 No. 17 incense Hill Road, science and Technology Town, Guangzhou hi tech Development Zone, Guangdong, China Patentee before: Guangzhou Sanjing Electric Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120509 Termination date: 20170915 |