CN104076186B - A kind of based on waveform sampling automatically enter voltage decision circuitry - Google Patents
A kind of based on waveform sampling automatically enter voltage decision circuitry Download PDFInfo
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- CN104076186B CN104076186B CN201410348742.3A CN201410348742A CN104076186B CN 104076186 B CN104076186 B CN 104076186B CN 201410348742 A CN201410348742 A CN 201410348742A CN 104076186 B CN104076186 B CN 104076186B
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Abstract
The present invention discloses and a kind of based on waveform sampling automatically enters voltage decision circuitry, including: a rectification circuit, this rectification circuit for being converted into a unidirectional current V1 by input current；One voltage signal sampling circuit, this voltage signal sampling circuit voltage signal Vin after this unidirectional current V1 being carried out voltage signal sampling and obtains a sampling；One processes circuit, and this process circuit for judging the type of this input current according to the waveform difference of this unidirectional current V1 He this voltage signal Vin.
Description
Technical field
The present invention relates to a kind of voltage signal control circuit, particularly relate to a kind of based on waveform sampling automatically enter voltage decision circuitry.
Background technology
Owing to whole world electrical network kind is the most, even there is multiple voltage input in same country or area, properly functioning in order to cause a machine to, therefore the judgement for input voltage just seems extremely important simultaneously.Traditional input voltage judges to be substantially the effect playing an input voltage judgement by artificially changing hardware, or is realized by loaded down with trivial details hardware logic electric circuit, and its shortcoming is that operation is unreliable, bothers.But, based on waveform sampling automatically enter voltage decision circuitry, use the automatic decision that hardware-software combines, so the voltage decision circuitry that automatically enters based on waveform sampling has become the development trend that follow-up input voltage judges.
Summary of the invention
In order to overcome defect of the prior art, the present invention provides a kind of and based on waveform sampling automatically enters voltage decision circuitry.
In order to realize foregoing invention purpose, the present invention discloses and a kind of based on waveform sampling automatically enters voltage decision circuitry, including:
One rectification circuit, this rectification circuit for being converted into a unidirectional current V1 by input current；One voltage signal sampling circuit, this voltage signal sampling circuit voltage signal Vin after this unidirectional current V1 being carried out voltage signal sampling and obtains a sampling；One processes circuit, and this process circuit for judging the type of this input current according to the waveform difference of this unidirectional current V1 He this voltage signal Vin.
Further, this input current is 380 volts of alternating currents of three-phase or 220 volts of alternating currents of three-phase or 380 volts of alternating currents of individual event or 220 volts of alternating currents of individual event.
Further, the waveform of this voltage signal Vin is consistent with unidirectional current V1.
Further, this voltage signal sampling circuit includes a comparator, an optocoupler and an operational amplifier, this comparator is for comparing the Shunt Voltage value of unidirectional current V1 and controlling the break-make of this optocoupler according to comparative result, and the output valve of this optocoupler exports after this operational amplifier amplifies.
Further, being connected with resistance R3 after the filtering of this unidirectional current V1 outfan, the outfan of resistance R3 is connected and is connected with the positive input terminal of this comparator after a resistance R4；It is connected with the negative input end of this comparator after outfan series resistance R2 of resistance R3, R5, R6.
Further, the outfan of this comparator and a resistance R7 are connected, and the outfan of this resistance R7 is connected with the input of this optocoupler.
Further, this process circuit is for judging that according to the waveform difference of this unidirectional current V1 He this voltage signal Vin the concrete steps of type of this input current include: step one, judging whether be less than V by Vin, to put down-V the most pre-, wherein V puts down is the meansigma methods of commutating voltage V1, and V is a preset value in advance；Step 2, when the judgement of continuous m step one is true, then input is for individual event alternating current, and otherwise input is three-phase alternating current.
Further, this step also includes step 3: judge whether Vin is more than 220V more than Vcom, Vcom less than 380V according to the result of step 2, if being judged as true, then input is 380V, is otherwise 220V.
Compared with prior art, provided by the present invention based on waveform sampling automatically entering voltage decision circuitry, circuit design is short and sweet, cost-effective, and it is little that circuit takies real space, simple to operate, easy to use and stable.To system input voltage, the voltage decision circuitry that automatically enters based on waveform sampling provided by the present invention judges that the time is short, reaction is fast, output signal and microprocessor seamless link.
Accompanying drawing explanation
Can be described in detail by invention below about the advantages and spirit of the present invention and institute's accompanying drawings is further understood.
Fig. 1 is the involved in the present invention hardware architecture diagram automatically entering voltage decision circuitry；
Fig. 2 is the involved in the present invention circuit configuration schematic diagram automatically entering voltage decision circuitry；
Fig. 3 is the involved in the present invention decision flow chart automatically entering voltage decision circuitry.
Detailed description of the invention
The based on the waveform sampling of a kind of specific embodiment describing the present invention below in conjunction with the accompanying drawings in detail automatically enters voltage decision circuitry.But, it should the present invention is understood as being not limited to this embodiment described below, and the other technologies combination that the technical concept of the present invention can be identical with those known technologies with other known technologies or function is implemented.
Fig. 1 is the involved in the present invention hardware architecture diagram automatically entering voltage decision circuitry.As shown in fig. 1, through over commutation device 101, commutator 101, alternating current is converted to unidirectional current after alternating current input.Voltage signal sampling circuit 102 carries out isolation sampling to unidirectional current.Current signal after sampling judges the type of the alternating current of input after microprocessor 103 computing.
Fig. 2 is the involved in the present invention circuit configuration schematic diagram automatically entering voltage decision circuitry.Fig. 2 shows commutator 101 and the particular circuit configurations of voltage signal sampling circuit 102.Input AC electricity becomes unidirectional current V1 by commutator 101, by voltage signal sampling isolation circuit 102, V1 is carried out voltage signal sampling Vin again, the waveform of Vin is consistent with V1, and send the voltage signal of sampling to microprocessor, finally according to the program numbered in advance in microprocessor, input electricity is judged.
The three-phase of input current connects respectively at diode D1, D2, D3, D4, D5, D6, forms a three-phase commutation bridge.Alternating current is converted to unidirectional current V1 by three-phase commutation bridge.V1 is used for filtering as the input of voltage signal sampling circuit 102 and an electric capacity C2 and resistance R1 parallel connection.Being connected with resistance R3 after the filtering of this unidirectional current V1 outfan, the outfan of resistance R3 is connected and is connected with the positive input terminal of this comparator after a resistance R4；After outfan series resistance R2 of resistance R3, R5, R6, the negative input end with comparator U1 is connected.The positive input terminal of comparator U1 is also connected with an electric capacity C3.
The outfan of comparator U1 connect after a resistance R7 with the input as isolation optocoupler.The outfan of isolation optocoupler connects an operational amplification circuit U2.The outfan of operational amplification circuit U2 is connected and is obtained a sampled voltage Vin after a resistance R9.
According to single-phase electricity and three-phase electricity in the obvious difference of waveform of the DC voltage V1 after over commutation, going out meansigma methods V of commutating voltage and the electrical voltage point v that processor is given by hardware circuit design, and comparison point be arranged on V-v at, v value must be in right amount.
Fig. 3 is the involved in the present invention decision flow chart automatically entering voltage decision circuitry.As it is shown on figure 3, first judge that input current is three-phase or single-phase, then judge the magnitude of voltage size of input current.
Specifically judge that step is as follows: step 301: judge whether Vin chooses voluntarily less than v, v below meansigma methods V, need appropriate.Step 302: if being judged as true, then count value N+1；Otherwise, return 301 and continue cycling through judgement.Step 303 circulates n input cycle, it is judged that whether N is more than value m is previously set.Presetting m in the present embodiment is 40.If being judged as true, then input is single-phase electricity 308；Otherwise input is three-phase electricity 304.Judge that whether Vin is more than given fiducial value respectively
(being slightly less than 380V), step 305 or 309.If being judged as true, then input is 380V；Otherwise input is 220V.Vin is the weak electric signal that V1 entered that dividing potential drop isolation circuit conversion was, fiducial value V and Vcom is required to reduce corresponding ratio.
Compared with prior art, provided by the present invention based on waveform sampling automatically entering voltage decision circuitry, circuit design is short and sweet, cost-effective, and it is little that circuit takies real space, simple to operate, easy to use and stable.To system input voltage, the voltage decision circuitry that automatically enters based on waveform sampling provided by the present invention judges that the time is short, reaction is fast, output signal and microprocessor seamless link.
The preferred embodiment of the simply present invention described in this specification, above example is only in order to illustrate technical scheme rather than limitation of the present invention.All those skilled in the art, all should be within the scope of the present invention under this invention's idea by the available technical scheme of logical analysis, reasoning, or a limited experiment.
Claims (7)
1. one kind based on waveform sampling automatically enters voltage decision circuitry, it is characterised in that including:
One rectification circuit, described rectification circuit for being converted into a unidirectional current V1 by input current；
One voltage signal sampling circuit, described voltage signal sampling circuit voltage signal Vin after described unidirectional current V1 being carried out voltage signal sampling and obtains a sampling；
One processes circuit, and described process circuit for judging the type of described input current according to the waveform difference of described unidirectional current V1 and described voltage signal Vin；
Described voltage signal sampling circuit includes a comparator, an optocoupler and an operational amplifier, described comparator is for comparing the Shunt Voltage value of unidirectional current V1 and controlling the break-make of described optocoupler according to comparative result, and the output valve of described optocoupler exports after described operational amplifier amplifies.
2.
As claimed in claim 1 based on waveform sampling automatically enter voltage decision circuitry, it is characterised in that described input current is 380 volts of alternating currents of three-phase or 220 volts of alternating currents of three-phase or single-phase 380 volts of alternating currents or single-phase 220 volts of alternating currents.
3.
As claimed in claim 1 based on waveform sampling automatically enter voltage decision circuitry, it is characterised in that the waveform of described voltage signal Vin is consistent with unidirectional current V1.
4.
As claimed in claim 3 based on waveform sampling automatically entering voltage decision circuitry, it is characterised in that be connected with resistance R3 after the filtering of described unidirectional current V1 outfan, the outfan of resistance R3 is connected and is connected with the positive input terminal of described comparator after a resistance R4；After outfan series resistance R2 of resistance R3, R5, R6, the negative input end with described comparator is connected.
5.
As claimed in claim 3 based on waveform sampling automatically enter voltage decision circuitry, it is characterised in that the outfan of described comparator and a resistance R7 are connected, and the outfan of described resistance R7 is connected with the input of described optocoupler.
6.
As claimed in claim 1 based on waveform sampling automatically enter voltage decision circuitry, it is characterised in that described process circuit includes for the concrete steps judging the type of described input current according to the waveform difference of described unidirectional current V1 and described voltage signal Vin:
Step one, judging that Vin is whether pre-less than the flat-V of V, wherein V puts down is the meansigma methods of unidirectional current V1, and V is a preset value in advance；
Step 2, when the judgement of continuous m step one is true, then input is for single-phase alternating current, and otherwise input is three-phase alternating current.
7. as claimed in claim 6 based on waveform sampling automatically enter voltage decision circuitry, it is characterised in that described step 2 also includes step 3:
Result according to step 2 judges whether Vin gives fiducial value Vcom more than one, if being judged as true, then input is 380V, is otherwise 220V.
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| CN203951461U (en) * | 2014-07-22 | 2014-11-19 | 上海威特力焊接设备制造股份有限公司 | A kind of automatic input voltage decision circuitry based on waveform sampling |
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| US5250893A (en) * | 1992-01-31 | 1993-10-05 | Tegam, Inc. | Digital voltmeter |
| CN101685120B (en) * | 2008-04-18 | 2011-11-02 | 段志刚 | Method and circuit for detecting three-phase three-wire input default phase or imbalance |
| CN101655516B (en) * | 2008-08-20 | 2012-08-22 | 力博特公司 | Main-circuit input current detection device |
| CN101799520B (en) * | 2010-01-27 | 2011-12-07 | 付爱喜 | Open-phase detection method and detection circuit for three-phase power source |
| CN102162822B (en) * | 2010-12-24 | 2014-12-17 | 海信（山东）空调有限公司 | Direct-current detection circuit and variable-frequency air conditioner using same |
| CN203054063U (en) * | 2013-01-08 | 2013-07-10 | 北京国电四维清洁能源技术有限公司 | Input voltage measuring circuit for high-voltage frequency converter |
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| CN203951461U (en) * | 2014-07-22 | 2014-11-19 | 上海威特力焊接设备制造股份有限公司 | A kind of automatic input voltage decision circuitry based on waveform sampling |
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