CN105425055A - Input open-phase detection apparatus and method, and multi-phase AC input electronic device - Google Patents
Input open-phase detection apparatus and method, and multi-phase AC input electronic device Download PDFInfo
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Abstract
The invention provides an input open-phase detection apparatus and method, and a multi-phase AC input electronic device. The input open-phase detection apparatus comprises: a rectification and filtering unit, which is used for rectifying and filtering multi-phase AC input voltages to obtain DC voltage signals; a DC voltage sampling unit, which is used for sampling the DC voltage signals output from the rectification and filtering unit to obtain sampled DC voltage signals; and an input open-phase determining unit, which is used for conducting a fast Fourier transform (FFT) operation on the sampled DC voltage signals output from the DC voltage sampling unit to extract normal frequency components and abnormal frequency components of the DC voltage signals, and also for determining whether input open-phase exists by comparing the normal frequency components with the abnormal frequency components. No additional heavy current detection circuit is needed. Input open-phase can be detected in a light load or zero load condition, and the input open-phase detection apparatus can work reliably if input voltages fluctuate or the like.
Description
Technical field
The present invention relates to input phase failure detection technique, more specifically, relate to input phase failure pick-up unit, input phase failure detection method and polyphase ac input electronic equipment.
Background technology
For the electronic equipment using polyphase ac input, it is a kind of basic frequency converter function that input phase failure detects.Common input phase failure detection method is by directly measuring polyphase ac input voltage, or convert commutating voltage to pulse signal or simulating signal by additional rectification circuit, by isolation optocoupler, coherent signal is sent to processor again, carries out logical operation and judgement by processor.But this method needs additional input voltage forceful electric power testing circuit, brings the problems such as insulating space, cost, circuit reliability.In addition, use in the electronic equipment of polyphase ac input at some, utilize existing main circuit rectification circuit, judge whether input phase failure occurs by the lasting dull time of the wave amplitude size or DC voltage ripple that detect the direct current embossing of rectification circuit.Such as, in patent documentation CN102778612A, comprise: power input unit for the device detecting input phase failure, it applies three-phase alternating voltage; Rectification unit, it carries out rectification to the alternating voltage applied by described power input unit; Filter unit, it carries out bandpass filtering to the voltage through rectification and calculates the amplitude of ripple voltage according to the voltage through filtering; And input phase failure detecting unit, it determines whether to there occurs input phase failure according to the amplitude of ripple voltage, particularly, when the amplitude of ripple voltage is less than predetermined value, judge input phase failure does not occur, when the amplitude of ripple voltage is greater than predetermined value, judge input phase failure to occur.In addition, a kind of method for detecting input phase failure of three-phase input device is disclosed in patent documentation CN102419400, DC bus-bar voltage is obtained after rectifying and wave-filtering is carried out to the three-phase input voltage of three-phase input equipment, DC bus-bar voltage is sampled according to certain time interval, when there is the sampled voltage of continuous n dullness in sample voltage value, record an input phase failure, when the input phase failure number of times detected in time T is greater than phase shortage setting value, be judged as input phase failure, otherwise be judged as inputting not phase shortage, when there is not the sample voltage value of arbitrary continuation n dullness in sample voltage value, be judged as inputting not phase shortage.But above-mentioned method for detecting open phase only just can detect input phase failure in polyphase ac input electronic device works to during high capacity usually, the risk being with heavy duty to damage when polyphase ac input electronic equipment exists single-phase input, and when states such as polyphase ac input electronic device works is unstable at input voltage, input imbalance, the hunting of load or loading and unloading transient states, there is the out of order risk of mistake inspection.
Summary of the invention
The technical problem to be solved in the present invention
The present invention aims to provide a kind of input phase failure pick-up unit, input phase failure detection method and polyphase ac input electronic equipment, without the need to additional input voltage forceful electric power testing circuit, input phase failure can be detected when polyphase ac inputs electronic equipment band underload or be unloaded, and can reliably working under input voltage fluctuation, input imbalance, the hunting of load and loading and unloading transient state.
The technical scheme of technical solution problem
The invention provides a kind of input phase failure pick-up unit, comprising: rectification and filter unit, for carrying out rectification and filtering to polyphase ac input voltage, obtaining d. c. voltage signal; DC voltage sampling unit, samples for the d. c. voltage signal exported rectification and filter unit, obtains d. c. voltage signal of sampling; Input phase failure identifying unit, sampling d. c. voltage signal for exporting DC voltage sampling unit carries out Fast Fourier Transform (FFT) (FFT) computing, to extract the normal frequency composition of d. c. voltage signal and improper frequency content, and judge whether input phase failure by described normal frequency composition and improper frequency content being compared.
Preferably, input phase failure identifying unit can comprise: extraction module, FFT computing is carried out to the sampling d. c. voltage signal that DC voltage sampling unit exports, to extract the fundamental frequency signal amplitude of the DC voltage ripple of first frequency respectively as normal frequency composition, and the fundamental frequency signal amplitude extracting the DC voltage ripple of second frequency is as improper frequency content; Comparison module, by the fundamental frequency signal amplitude of the DC voltage ripple of second frequency relative to the ratio of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency compared with first threshold, and by the fundamental frequency signal amplitude of the DC voltage ripple of second frequency relative to the difference of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency compared with Second Threshold; Accumulator module, when the fundamental frequency signal amplitude of the DC voltage ripple of second frequency is greater than first threshold relative to the ratio of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency and the fundamental frequency signal amplitude of the DC voltage ripple of second frequency is greater than Second Threshold relative to the difference of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency, the number of times of input phase failure event is added 1; Determination module, when in accumulator module in the schedule time, the number of times of input phase failure event reaches pre-determined number, judges input phase failure occurs.
Preferably, first threshold can be determine according to the difference of first frequency and second frequency, and Second Threshold can be according to wishing when voltage detecting precision and phase shortage that the load of trigger protection is determined.Such as, first threshold can between 3 and 4, and Second Threshold can be not less than 2 volts.When 50Hz Power supply, first frequency can be 300Hz, and second frequency can be 100Hz.Within the signal period of normal frequency composition, the sampling number of d. c. voltage signal is not less than 3, and within the signal period of improper frequency content, the sampling number of d. c. voltage signal is not less than 6.Polyphase ac input voltage can be three-phase alternating current input voltage.
Present invention also offers a kind of polyphase ac input electronic equipment, comprise above-mentioned input phase failure pick-up unit.Described polyphase ac input electronic equipment can be frequency converter.
Present invention also offers a kind of input phase failure detection method, comprising: rectification and filtering are carried out to polyphase ac input voltage, obtains d. c. voltage signal; D. c. voltage signal is sampled, obtains d. c. voltage signal of sampling; FFT computing being carried out to sampling d. c. voltage signal, to extract the normal frequency composition of d. c. voltage signal and improper frequency content, and judging whether input phase failure by described normal frequency composition and improper frequency content being compared.
Preferably, FFT computing is carried out to sampling d. c. voltage signal, to extract the normal frequency composition of d. c. voltage signal and improper frequency content, and judge whether that input phase failure can comprise by described normal frequency composition and improper frequency content being compared: to sampling, d. c. voltage signal carries out FFT computing, to extract the fundamental frequency signal amplitude of the DC voltage ripple of first frequency respectively as normal frequency composition, and the fundamental frequency signal amplitude extracting the DC voltage ripple of second frequency is as improper frequency content; By the fundamental frequency signal amplitude of the DC voltage ripple of second frequency relative to the ratio of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency compared with first threshold, and by the fundamental frequency signal amplitude of the DC voltage ripple of second frequency relative to the difference of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency compared with Second Threshold; When the fundamental frequency signal amplitude of the DC voltage ripple of second frequency is greater than first threshold relative to the ratio of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency and the fundamental frequency signal amplitude of the DC voltage ripple of second frequency is greater than Second Threshold relative to the difference of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency, the number of times of input phase failure event is added 1; When in the schedule time, the number of times of input phase failure event reaches pre-determined number, judge input phase failure occurs.
Preferably, first threshold can be determine according to the difference of first frequency and second frequency, and Second Threshold can be according to wishing when voltage detecting precision and phase shortage that the load of trigger protection is determined.Such as, first threshold can between 3 and 4, and Second Threshold can be not less than 2 volts.When 50Hz Power supply, first frequency can be 300Hz, and second frequency can be 100Hz.Within the signal period of normal frequency composition, the sampling number of d. c. voltage signal is not less than 3, and within the signal period of improper frequency content, the sampling number of d. c. voltage signal is not less than 6.Polyphase ac input voltage can be three-phase alternating current input voltage.
Beneficial effect of the present invention
The input phase failure pick-up unit that the present invention proposes, input phase failure detection method and polyphase ac input electronic equipment at least tool has the following advantages:
1, without the need to additional hardware detecting circuit, particularly input voltage forceful electric power testing circuit, thus save space and cost and there is higher reliability;
2, input phase failure can be detected when polyphase ac inputs electronic equipment band underload or be unloaded, thus protect polyphase ac input electronic equipment better; And
3, when states such as polyphase ac input electronic device works is unstable at input voltage, input imbalance, the hunting of load or loading and unloading transient states, the out of order risk of mistake inspection is avoided.
Accompanying drawing explanation
By reading the following detailed description of the embodiment of the present invention and the present invention being understood better with reference to accompanying drawing, wherein:
Fig. 1 shows the structured flowchart of the input phase failure pick-up unit according to the embodiment of the present invention.
Fig. 2 shows the structured flowchart according to the input phase failure identifying unit in the input phase failure pick-up unit of the embodiment of the present invention.
Fig. 3 shows the structured flowchart of the frequency converter according to the embodiment of the present invention.
Fig. 4 shows the process flow diagram of the input phase failure detection method according to the embodiment of the present invention.
Embodiment
Hereinafter, with reference to the accompanying drawings the preferred embodiments of the present invention are described.Run through accompanying drawing, same reference numbers is used to indicate similar elements.
Fig. 1 shows the structured flowchart of the input phase failure pick-up unit according to the embodiment of the present invention.The input phase failure that input phase failure pick-up unit 100 provided by the invention may be used for polyphase ac input electronic equipment detects.Such as, polyphase ac input electronic equipment can be frequency converter, servo-driver, UPS etc.As shown in Figure 1, input phase failure pick-up unit 100 can comprise rectification and filter unit 101, DC voltage sampling unit 102 and input phase failure identifying unit 103.
Rectification and filter unit 101 pairs of polyphase ac input voltages carry out rectification and filtering, obtain d. c. voltage signal.Polyphase ac input voltage can be three-phase alternating current input voltage.
The d. c. voltage signal that the 102 pairs of rectifications of DC voltage sampling unit and filter unit 101 export is sampled, and obtains d. c. voltage signal of sampling.In the present embodiment, within the signal period of normal frequency composition, the sampling number of d. c. voltage signal is not less than 3, and within the signal period of improper frequency content, the sampling number of d. c. voltage signal is not less than 6.
The sampling d. c. voltage signal that input phase failure identifying unit 103 pairs of DC voltage sampling units 102 export carries out FFT computing, to extract the normal frequency composition of d. c. voltage signal and improper frequency content, and judge whether input phase failure by described normal frequency composition and improper frequency content being compared.Input phase failure identifying unit 103 can be realized by microprocessor.First A/D conversion can be carried out to the received signal before microprocessor processes.
In the present embodiment, DC voltage sampling unit 102 and input phase failure identifying unit 103 can input the DC voltage testing circuit of electronic equipment self by polyphase ac and microprocessor realizes.
Fig. 2 shows the structured flowchart according to the input phase failure identifying unit 103 in the input phase failure pick-up unit of the embodiment of the present invention.As shown in Figure 2, input phase failure identifying unit 103 can comprise extraction module 1031, comparison module 1032, accumulator module 1033 and determination module 1034.
The sampling d. c. voltage signal that extraction module 1031 pairs of DC voltage sampling units export carries out FFT computing, to extract the fundamental frequency signal amplitude of the DC voltage ripple of first frequency respectively as normal frequency composition, and the fundamental frequency signal amplitude extracting the DC voltage ripple of second frequency is as improper frequency content.When 50Hz Power supply, first frequency can be 300Hz, and second frequency can be 100Hz.Herein, the fundamental frequency signal amplitude of so-called DC voltage ripple also can be replaced by other numerical value such as the effective values with amplitude in proportion.
Comparison module 1032 by the fundamental frequency signal amplitude U1 of the DC voltage ripple of second frequency relative to the ratio U1/U0 of the fundamental frequency signal amplitude U0 of the DC voltage ripple of first frequency compared with first threshold K, and by the fundamental frequency signal amplitude U1 of the DC voltage ripple of second frequency relative to the difference U1-U0 of the fundamental frequency signal amplitude U0 of the DC voltage ripple of first frequency compared with Second Threshold Y.Preferably, first threshold K can be determined according to the difference of first frequency and second frequency, according to wishing when voltage detecting precision and phase shortage that the load of trigger protection determines Second Threshold Y.Such as, voltage detecting precision is poorer, or wishes during phase shortage that the load of trigger protection is larger, then Second Threshold Y is larger.In the present embodiment, first threshold K can between 3 and 4, and Second Threshold Y can be not less than 2 volts.
The number of times of input phase failure event, when the fundamental frequency signal amplitude U1 of the DC voltage ripple of second frequency is greater than first threshold K relative to the ratio U1/U0 of the fundamental frequency signal amplitude U0 of the DC voltage ripple of first frequency and the fundamental frequency signal amplitude U1 of the DC voltage ripple of second frequency is greater than Second Threshold Y relative to the difference U1-U0 of the fundamental frequency signal amplitude U0 of the DC voltage ripple of first frequency, is added 1 by accumulator module 1033.
Determination module 1034, when in accumulator module 1033 in schedule time T, the number of times of input phase failure event reaches pre-determined number N, judges input phase failure occurs.After input phase failure occurs in judgement, corresponding control and scheduling co-design can be taked, and can report to the police.In the present embodiment, time T can be 500 milliseconds, and N can be 50 times.If realize higher susceptibility, N can be 25 times.
Fig. 3 shows the structured flowchart of the frequency converter 300 according to the embodiment of the present invention.Frequency converter 300 contains the input phase failure pick-up unit 100 of Fig. 1.As shown in Figure 3, frequency converter 300, except comprising rectification and filter unit 101, DC voltage sampling unit 102 and input phase failure identifying unit 103, can also comprise inversion unit 301.About rectification and filter unit 101, DC voltage sampling unit 102 and input phase failure identifying unit 103, be above described in detail with reference to figure 1 and Fig. 2, do not repeat them here.In the present embodiment, inversion unit 301, according to the judged result of input phase failure identifying unit 103, determines how the d. c. voltage signal that rectification and filter unit 101 export is reverse into ac voltage signal and exports.Such as; input phase failure identifying unit 103 is when judging to there occurs input phase failure; can send control and scheduling co-design signal to inversion unit 301, inversion unit 301 can stop the d. c. voltage signal that rectification and filter unit 101 export being reverse into ac voltage signal according to described control and scheduling co-design signal and export or coverage output.Preferably, input phase failure identifying unit 103 can also be reported to the police when judgement there occurs input phase failure.
Fig. 4 shows the process flow diagram of the input phase failure detection method according to the embodiment of the present invention.Input phase failure detection method provided by the invention can be used in polyphase ac input electronic equipment.Such as, inputting electronic equipment in polyphase ac can be frequency converter, servo-driver, UPS etc.Input phase failure detection method can comprise: carry out rectification and filtering to polyphase ac input voltage, obtain d. c. voltage signal; D. c. voltage signal is sampled, obtains d. c. voltage signal of sampling; And FFT computing is carried out to sampling d. c. voltage signal, to extract the normal frequency composition of d. c. voltage signal and improper frequency content, and judge whether input phase failure by described normal frequency composition and improper frequency content being compared.
Below with reference to Fig. 4, input phase failure detection method provided by the invention is described in detail.
In step 401, rectification and filtering are carried out to polyphase ac input voltage, obtains d. c. voltage signal.Polyphase ac input voltage can be three-phase alternating current input voltage.
In step 402, d. c. voltage signal is sampled, obtain d. c. voltage signal of sampling.In the present embodiment, filtering noise operation can be performed after the sampling, then judge that whether sampling number is greater than predetermined numerical value, if so, then proceeds to step 403, otherwise return step 402 continuation sampling.Within the signal period of normal frequency composition, the sampling number of d. c. voltage signal is not less than 3, and within the signal period of improper frequency content, the sampling number of d. c. voltage signal is not less than 6.
In step 403, FFT computing is carried out to sampling d. c. voltage signal, to extract the fundamental frequency signal amplitude U0 of the DC voltage ripple of first frequency respectively as normal frequency composition, and the fundamental frequency signal amplitude U1 extracting the DC voltage ripple of second frequency is as improper frequency content.When 50Hz Power supply, first frequency can be 300Hz, and second frequency can be 100Hz.
In step 404, by the fundamental frequency signal amplitude U1 of the DC voltage ripple of second frequency relative to the ratio U1/U0 of the fundamental frequency signal amplitude U0 of the DC voltage ripple of first frequency compared with first threshold K, and by the fundamental frequency signal amplitude U1 of the DC voltage ripple of second frequency relative to the difference U1-U0 of the fundamental frequency signal amplitude U0 of the DC voltage ripple of first frequency compared with Second Threshold Y, if U1/U0 > K and U1-U0 > Y, then proceed to step 405, otherwise proceed to step 406.Preferably, first threshold K can be determined according to the difference of first frequency and second frequency, according to wishing when voltage detecting precision and phase shortage that the load of trigger protection determines Second Threshold Y.Such as, voltage detecting precision is poorer, or wishes during phase shortage that the load of trigger protection is larger, then Second Threshold Y is larger.In the present embodiment, first threshold K can between 3 and 4, and Second Threshold Y can be not less than 2 volts.
In step 405, the number of times of input phase failure event is added 1.
In step 406, judge whether the number of times of input phase failure event in schedule time T reaches pre-determined number N, if so, then think and perform generation input phase failure corresponding control and scheduling co-design and report to the police, otherwise returning step 402.In the present embodiment, time T can be 500 milliseconds, and N can be 50 times.If realize higher susceptibility, N can be 25 times.
Input phase failure pick-up unit provided by the invention, input phase failure detection method and polyphase ac input electronic equipment utilize polyphase ac to input existing d. c. voltage signal in electronic equipment, use the normal frequency composition in fft algorithm extraction d. c. voltage signal and improper frequency content, judge whether by comparing to these two kinds of frequency contents input phase failure occurs, therefore without the need to additional forceful electric power testing circuit, save space and cost and there is higher reliability, input phase failure can be detected when polyphase ac inputs electronic equipment band underload or be unloaded, electronic equipment is inputted to protect polyphase ac better, and when polyphase ac input electronic device works is unstable at input voltage, input is uneven, still can normally work during the states such as the hunting of load or loading and unloading transient state, avoid the out of order risk of mistake inspection.
Described the present invention by preferred embodiment although above; but the present invention is not limited to above-mentioned specific embodiment; do not deviating under the present invention's spirit and real situation thereof; those of ordinary skill in the art can make various corresponding change and distortion according to the present invention, and these corresponding changes and distortion all should belong within claims protection domain of the present invention.
Claims (16)
1. an input phase failure pick-up unit, comprising:
Rectification and filter unit, for carrying out rectification and filtering to polyphase ac input voltage, obtain d. c. voltage signal;
DC voltage sampling unit, samples for the d. c. voltage signal exported rectification and filter unit, obtains d. c. voltage signal of sampling;
Input phase failure identifying unit, sampling d. c. voltage signal for exporting DC voltage sampling unit carries out Fast Fourier Transform (FFT) FFT computing, to extract the normal frequency composition of d. c. voltage signal and improper frequency content, and judge whether input phase failure by described normal frequency composition and improper frequency content being compared.
2. input phase failure pick-up unit according to claim 1, wherein, described input phase failure identifying unit comprises:
Extraction module, FFT computing is carried out to the sampling d. c. voltage signal that DC voltage sampling unit exports, to extract the fundamental frequency signal amplitude of the DC voltage ripple of first frequency respectively as normal frequency composition, and the fundamental frequency signal amplitude extracting the DC voltage ripple of second frequency is as improper frequency content;
Comparison module, by the fundamental frequency signal amplitude of the DC voltage ripple of second frequency relative to the ratio of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency compared with first threshold, and by the fundamental frequency signal amplitude of the DC voltage ripple of second frequency relative to the difference of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency compared with Second Threshold;
Accumulator module, when the fundamental frequency signal amplitude of the DC voltage ripple of second frequency is greater than first threshold relative to the ratio of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency and the fundamental frequency signal amplitude of the DC voltage ripple of second frequency is greater than Second Threshold relative to the difference of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency, the number of times of input phase failure event is added 1;
Determination module, when in accumulator module in the schedule time, the number of times of input phase failure event reaches pre-determined number, judges input phase failure occurs.
3. input phase failure pick-up unit according to claim 2; wherein; described first threshold determines according to the difference of first frequency and second frequency, and described Second Threshold is according to wishing when voltage detecting precision and phase shortage that the load of trigger protection is determined.
4. input phase failure pick-up unit according to claim 2, wherein, described first threshold is between 3 and 4, and described Second Threshold is not less than 2 volts.
5. input phase failure pick-up unit according to claim 2, wherein, when 50Hz Power supply, first frequency is 300Hz, and second frequency is 100Hz.
6. input phase failure pick-up unit according to claim 2, wherein, within the signal period of normal frequency composition, the sampling number of d. c. voltage signal is not less than 3, within the signal period of improper frequency content, the sampling number of d. c. voltage signal is not less than 6.
7. input phase failure pick-up unit according to claim 1, wherein, described polyphase ac input voltage is three-phase alternating current input voltage.
8. a polyphase ac input electronic equipment, comprises input phase failure pick-up unit according to claim 1.
9. polyphase ac input electronic equipment according to claim 8, wherein, described polyphase ac input electronic equipment is frequency converter.
10. an input phase failure detection method, comprising:
Rectification and filtering are carried out to polyphase ac input voltage, obtains d. c. voltage signal;
D. c. voltage signal is sampled, obtains d. c. voltage signal of sampling;
Fast Fourier Transform (FFT) FFT computing is carried out to sampling d. c. voltage signal, to extract the normal frequency composition of d. c. voltage signal and improper frequency content, and judge whether input phase failure by described normal frequency composition and improper frequency content being compared.
11. input phase failure detection methods according to claim 10, wherein, Fast Fourier Transform (FFT) FFT computing is carried out to sampling d. c. voltage signal, to extract the normal frequency composition of d. c. voltage signal and improper frequency content, and judge whether that input phase failure comprises by described normal frequency composition and improper frequency content being compared:
FFT computing is carried out to sampling d. c. voltage signal, to extract the fundamental frequency signal amplitude of the DC voltage ripple of first frequency respectively as normal frequency composition, and the fundamental frequency signal amplitude extracting the DC voltage ripple of second frequency is as improper frequency content;
By the fundamental frequency signal amplitude of the DC voltage ripple of second frequency relative to the ratio of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency compared with first threshold, and by the fundamental frequency signal amplitude of the DC voltage ripple of second frequency relative to the difference of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency compared with Second Threshold;
When the fundamental frequency signal amplitude of the DC voltage ripple of second frequency is greater than first threshold relative to the ratio of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency and the fundamental frequency signal amplitude of the DC voltage ripple of second frequency is greater than Second Threshold relative to the difference of the fundamental frequency signal amplitude of the DC voltage ripple of first frequency, the number of times of input phase failure event is added 1;
When in the schedule time, the number of times of input phase failure event reaches pre-determined number, judge input phase failure occurs.
12. input phase failure detection methods according to claim 11; wherein; described first threshold determines according to the difference of first frequency and second frequency, and described Second Threshold is according to wishing when voltage detecting precision and phase shortage that the load of trigger protection is determined.
13. input phase failure detection methods according to claim 11, wherein, described first threshold is between 3 and 4, and described Second Threshold is not less than 2 volts.
14. input phase failure detection methods according to claim 11, wherein, when 50Hz Power supply, first frequency is 300Hz, and second frequency is 100Hz.
15. input phase failure detection methods according to claim 11, wherein, within the signal period of normal frequency composition, the sampling number of d. c. voltage signal is not less than 3, within the signal period of improper frequency content, the sampling number of d. c. voltage signal is not less than 6.
16. input phase failure detection methods according to claim 10, wherein, described polyphase ac input voltage is three-phase alternating current input voltage.
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