CN101556295A - Voltage linear isolation detection method and circuit - Google Patents
Voltage linear isolation detection method and circuit Download PDFInfo
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- CN101556295A CN101556295A CNA2009101117007A CN200910111700A CN101556295A CN 101556295 A CN101556295 A CN 101556295A CN A2009101117007 A CNA2009101117007 A CN A2009101117007A CN 200910111700 A CN200910111700 A CN 200910111700A CN 101556295 A CN101556295 A CN 101556295A
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Abstract
The invention relates to the field of voltage isolation detection circuits, in particular to a voltage linear isolation detection method and a circuit which are used for a voltage source inverter system. The voltage linear isolation detection method comprises the steps of processing the collected detected voltage into corresponding frequency signals by voltage/frequency conversion, and then processing the corresponding frequency signals into corresponding voltage signals by frequency/voltage conversion after the isolation transmission of the frequency signals. The isolation transmission of the frequency signals is conducted in a way of electrooptical-photoelectric conversion. The voltage linear isolation detection circuit comprises a voltage/frequency converting circuit module, a photoelectric coupler and a frequency/voltage converting circuit module which are sequentially and serially accessed to the end of voltage to be detected. By adopting the voltage isolation detection method and the circuit, the invention not only solves the defect of insufficient detection precision resulted from temperature drift effects successfully, but also has simple circuit structure and low cost.
Description
Technical field
The present invention relates to the isolation detection circuit field of voltage, in particular for the method and the circuit of the linear isolation detection of the voltage of voltage-source type inversion system.
Background technology
In fields such as electronic communication, electric system, the electric parameter that often needs detecting input, output port or some ad-hoc location, not altogether not because the detecting point is isolated with the measured position sometimes, can not directly detect the electric parameter that obtains the measured position like this, need take certain methods that the electric parameter of measured point is isolated to transmit also and accurately show.Especially inversion system field, inverter is a kind of power supply change-over device, direct current can be converted to the alternating current of 220V, 50Hz or the alternating current of other frequency, to satisfy mobile subscriber or the areas without electricity needs to alternating current.Inverter can use direct-flow storage battery power supply, also can with the supporting use of generator, at wind energy, the indispensable especially equipment of field of solar energy inverter.The use of high power contravariant device at present more and more widely, the capacity of used dc-battery group is increasing, the quantity that includes single battery is also increasing, cell voltage has risen to more than the 200V, therefore the performance of any batteries all may influence the operate as normal of inverter, the voltage of every batteries in the fast monitored electric battery at any time.Because every Battery pack is all connected, though the voltage of general every batteries has only 12V, but when measuring every batteries voltage, common mode voltage changes, mxm. even may surpass 200V, so it is difficult wanting these cell voltages are directly measured and handled with the microprocessor (MCU) of band A/D converter, must remove these common mode voltages.Have many Battery packs in the high power contravariant device, the battery sum can reach tens joints, in order to measure and handle this tens voltages with a microprocessor, the power supply VCC of these voltages and microprocessor is held altogether.Therefore, detecting direct current linear voltage can be isolated by an optical coupled switch pipe, utilizes the range of linearity characteristic of optocoupler diode, the voltage parameter linearity is delivered to the other end measures.As publication number is 2718594 patent, and its technical scheme is: it is made up of sample circuit and linear isolation voltage follower, and sample circuit is composed in series by resistance R 1, R2, and the serial connection point is output terminal; Linear isolation voltage follower is made up of transport and placing device N1, linear optical coupling device N2, resistance R 3, R5, capacitor C 1, send optical coupler N2 to isolate after signal is handled by transport and placing device N1, the signal after optical coupler is isolated be export to the microprocessor metering circuit and with MCU power supply voltage signal altogether.But this method for detecting depends on the linear characteristic of optocoupler diode, and in fact easy change because of environmental factor seems unstable, especially is subjected to temperature drift effects.Therefore error is bigger, can not widespread use.
Summary of the invention
At above-mentioned problem, method and circuit that the present invention proposes a kind of linear isolation detection of voltage solve, and not only circuit methods is simply effective, and have solved the not high problem of precision that causes because of the temperature drift factor in the prior art.The present invention is except the linear isolation detection of the DC voltage that is used for inversion system, and the fields such as electronic communication, electric system that can also be applied to need the aspect of voltage isolation detecting.
Concrete technical scheme of the present invention is:
A kind of method of linear isolation detection of voltage is that the tested voltage that will gather carries out the voltage/frequency conversion process and becomes the correspondent frequency signal, after the isolation transmission through frequency signal, again the correspondent frequency signal is carried out the frequency/voltage conversion process and become the correspondent voltage signal.
Further, the isolation transmission of described frequency signal is to isolate transmission by electric light-opto-electronic conversion mode.
A kind of circuit of linear isolation detection of voltage, the access that comprises series connection successively is in voltage/frequency change-over circuit module, photoelectrical coupler and the frequency/voltage change-over circuit module of tested voltage end.
Further, described photoelectrical coupler can be that model is the photoelectrical coupler of PC817.
The present invention adopts the method and the circuit of the linear isolation detection of such voltage, not only successfully solved the defect of insufficient detection precision that causes because of temperature drift effects, and circuit structure is simple, and is with low cost.
Description of drawings
Shown in Figure 1 is electrical schematic diagram of the present invention.
Embodiment
Now the present invention is further described with embodiment in conjunction with the accompanying drawings.
A kind of method of linear isolation detection of voltage is that the tested voltage U i that will gather carries out the voltage/frequency conversion process and becomes the correspondent frequency signal, after the isolation transmission through frequency signal, again the correspondent frequency signal is carried out the frequency/voltage conversion process and become correspondent voltage signal Uo.
Further, the isolation transmission of described frequency signal is to isolate transmission by electric light-opto-electronic conversion mode.
Consult shown in Figure 1ly, circuit of the present invention is: the access that comprises series connection successively is in voltage/frequency (V/F) change-over circuit module U1, photoelectrical coupler U3 and frequency/voltage (F/V) the change-over circuit module U2 of tested voltage U i end.
In the embodiment of the invention, described photoelectrical coupler U3 can be that model is the photoelectrical coupler of PC817.It is a kind of general light electric coupler of DIP4 encapsulation.Its electric characteristic is: current transfer ratio CTR: IF=5MA, and minimum value is 50% during VCE=5V, the high VISO of isolated voltage between the input and output: 5.0KV can satisfy the demand of circuit of the present invention.
Behind the voltage U i process V/F change-over circuit module U1 of tested end, convert the pulse electrical signal of band corresponding frequencies to, become the pulsed light of band same frequency then by the light emitting diode of photoelectrical coupler U3, convert the level signal variation to by the photodiode of photoelectrical coupler U3 or the light-receiving device of phototriode again, promptly convert the pulse electrical signal of same frequency to, realized the harmless transmission of frequency like this.Even photoelectrical coupler U3 is because of factor affecting such as temperature drifts, the level of pulse electrical signal is subjected to the influence of its element linear characteristic, but the frequency of its pulse electrical signal can't be influenced.The pulse electrical signal that the light-receiving device of photoelectrical coupler U3 is partly exported converts corresponding voltage U o to through F/V change-over circuit module U2 again and just can directly measure.Realized the linear isolation detection principle of DC voltage.
V/F change-over circuit module of the present invention and F/V change-over circuit module can adopt existing technology, repeat no more in this.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present invention that do not break away from appended claims and limited; can make various variations to the present invention in the form and details, be protection scope of the present invention.
Claims (4)
1. the method for the linear isolation detection of a voltage, it is characterized in that: the tested voltage (Ui) that will gather carries out the voltage/frequency conversion process and becomes the correspondent frequency signal, after the isolation transmission through frequency signal, again the correspondent frequency signal is carried out the frequency/voltage conversion process and become correspondent voltage signal (Uo).
2. the method for the linear isolation detection of voltage according to claim 1, it is characterized in that: the isolation transmission of described frequency signal is to isolate transmission by electric light-opto-electronic conversion mode.
3. the circuit of the linear isolation detection of a voltage is characterized in that: comprise that the access of connecting successively is in voltage/frequency change-over circuit module (U1), photoelectrical coupler (U3) and the frequency/voltage change-over circuit module (U2) of tested voltage (Ui) end.
4. the circuit of the linear isolation detection of voltage according to claim 1, it is characterized in that: described photoelectrical coupler (U3) can be that model is the photoelectrical coupler of PC817.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101117007A CN101556295A (en) | 2009-05-06 | 2009-05-06 | Voltage linear isolation detection method and circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009101117007A CN101556295A (en) | 2009-05-06 | 2009-05-06 | Voltage linear isolation detection method and circuit |
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| CN101556295A true CN101556295A (en) | 2009-10-14 |
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| CNA2009101117007A Pending CN101556295A (en) | 2009-05-06 | 2009-05-06 | Voltage linear isolation detection method and circuit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102298409A (en) * | 2011-08-10 | 2011-12-28 | 天津市东文高压电源厂 | Performance improving circuit of small-size high-voltage isolation voltage-to-voltage (VV) converter |
| CN102435821A (en) * | 2011-12-01 | 2012-05-02 | 合肥索维能源科技有限公司 | Detection method of three-phase inverter output line voltage |
| CN102778597A (en) * | 2012-08-04 | 2012-11-14 | 无锡隆玛科技股份有限公司 | Voltage frequency conversion high voltage isolating circuit for use in voltage measurement in photovoltaic power station |
| CN102937666A (en) * | 2012-11-21 | 2013-02-20 | 昆山北极光电子科技有限公司 | Method for non-contact measurement of spike voltage of generator |
| CN103439556A (en) * | 2013-08-28 | 2013-12-11 | 深圳威迈斯电源有限公司 | Optical coupling isolation linear detection circuit and implementation method thereof |
| CN105092954A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Novel online voltage monitoring apparatus for storage battery and method thereof |
| CN105092933A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Direct switch type online voltage monitoring apparatus for storage battery and method thereof |
| CN108075730A (en) * | 2018-01-03 | 2018-05-25 | 深圳市华杰电气技术有限公司 | A kind of tension measuring circuit |
| CN109507466A (en) * | 2018-11-15 | 2019-03-22 | 上海空间电源研究所 | A kind of high-precision wire sexual isolation sample circuit and its implementation method |
| CN109581027A (en) * | 2017-09-29 | 2019-04-05 | 兄弟工业株式会社 | Alternating voltage detection device, image forming apparatus and industrial machine |
| CN109633250A (en) * | 2018-11-09 | 2019-04-16 | 国网浙江省电力有限公司台州供电公司 | One kind prejudging system for protection supervisory equipment terminal block current potential automatic collection in substation |
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2009
- 2009-05-06 CN CNA2009101117007A patent/CN101556295A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102298409A (en) * | 2011-08-10 | 2011-12-28 | 天津市东文高压电源厂 | Performance improving circuit of small-size high-voltage isolation voltage-to-voltage (VV) converter |
| CN102435821A (en) * | 2011-12-01 | 2012-05-02 | 合肥索维能源科技有限公司 | Detection method of three-phase inverter output line voltage |
| CN102778597A (en) * | 2012-08-04 | 2012-11-14 | 无锡隆玛科技股份有限公司 | Voltage frequency conversion high voltage isolating circuit for use in voltage measurement in photovoltaic power station |
| CN102778597B (en) * | 2012-08-04 | 2014-06-25 | 无锡隆玛科技股份有限公司 | Voltage frequency conversion high voltage isolating circuit for use in voltage measurement in photovoltaic power station |
| CN102937666A (en) * | 2012-11-21 | 2013-02-20 | 昆山北极光电子科技有限公司 | Method for non-contact measurement of spike voltage of generator |
| CN103439556A (en) * | 2013-08-28 | 2013-12-11 | 深圳威迈斯电源有限公司 | Optical coupling isolation linear detection circuit and implementation method thereof |
| CN105092954A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Novel online voltage monitoring apparatus for storage battery and method thereof |
| CN105092933A (en) * | 2015-06-03 | 2015-11-25 | 大连市旅顺电力电子设备有限公司 | Direct switch type online voltage monitoring apparatus for storage battery and method thereof |
| CN105092954B (en) * | 2015-06-03 | 2017-12-08 | 大连市旅顺电力电子设备有限公司 | New on-Line Voltage monitoring device and its method for batteries |
| CN105092933B (en) * | 2015-06-03 | 2017-12-12 | 大连市旅顺电力电子设备有限公司 | Direct transform on-Line Voltage monitoring device and its method for batteries |
| CN109581027A (en) * | 2017-09-29 | 2019-04-05 | 兄弟工业株式会社 | Alternating voltage detection device, image forming apparatus and industrial machine |
| CN108075730A (en) * | 2018-01-03 | 2018-05-25 | 深圳市华杰电气技术有限公司 | A kind of tension measuring circuit |
| CN109633250A (en) * | 2018-11-09 | 2019-04-16 | 国网浙江省电力有限公司台州供电公司 | One kind prejudging system for protection supervisory equipment terminal block current potential automatic collection in substation |
| CN109507466A (en) * | 2018-11-15 | 2019-03-22 | 上海空间电源研究所 | A kind of high-precision wire sexual isolation sample circuit and its implementation method |
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Open date: 20091014 |