CN103308756A - Frequency changer voltage detection circuit - Google Patents
Frequency changer voltage detection circuit Download PDFInfo
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- CN103308756A CN103308756A CN2013102343162A CN201310234316A CN103308756A CN 103308756 A CN103308756 A CN 103308756A CN 2013102343162 A CN2013102343162 A CN 2013102343162A CN 201310234316 A CN201310234316 A CN 201310234316A CN 103308756 A CN103308756 A CN 103308756A
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- chip microcomputer
- frequency changer
- voltage
- detection circuit
- voltage detection
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Abstract
The invention discloses a frequency changer voltage detection circuit which comprises a voltage division resistor, a single chip microcomputer and a photoelectric coupler. Strong-current power at the alternating-current input end of a frequency changer main loop is output to the single chip microcomputer through voltage reduction by the voltage division resistor, and the single chip microcomputer converts collected voltage signals into digital signals which are output to a frequency changer main control system through the photoelectric coupler in a weak current form. Adoption of a high-cost sensor is avoided, so that the frequency changer voltage detection circuit is simple in structure, few in component, stable in structure performance and low in cost.
Description
Technical field
The present invention relates to a kind of frequency converter voltage testing circuit, belong to the voltage detecting field.
Background technology
Since the 90's of 20th century, development along with Power Electronic Technique, make and adopt the variable-frequency control technique of power electronic devices to be able to fast development, particularly large scale integrated circuit and computer control occur, and the high-performance AC frequency conversion speed-adjusting system arises at the historic moment.
Frequency converter need be imported it, output voltage detects in real time; so that master control system realizes demonstration and the statistics of service data, in addition, the more important thing is; some control of high voltage converter and the realization of defencive function also must have in real time voltage detecting accurately.
The voltage detecting of existing frequency converter is most to adopt sensor, but the cost of sensor is higher, and the application on voltage sample will possess higher technical requirement to sensor.In addition, do not isolate in the existing detection mode, if the main control chip is located at the weak-feedback side of transmission line of secondary in the frequency converter overall plan, then this detection mode can not be suitable for.In addition, the detection signal that is in the forceful electric power side in the foregoing circuit is disturbed easily, less stable.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of frequency converter voltage testing circuit, has avoided adopting expensive sensor, and it is simple in structure, and components and parts are few, and structural behaviour is stable, and cost is low.
In order to achieve the above object, the present invention adopts following technical scheme: a kind of frequency converter voltage testing circuit comprises divider resistance, single-chip microcomputer and photoelectrical coupler; The forceful electric power power supply of the ac input end of frequency converter major loop outputs to single-chip microcomputer after the divider resistance step-down, single-chip microcomputer is converted to digital signal with the above-mentioned voltage signal that collects, and outputs to frequency transformer main control system by photoelectrical coupler light current then.
The invention has the beneficial effects as follows: the present invention has avoided adopting expensive sensor, and it is simple in structure, and components and parts are few, and structural behaviour is stable, and cost is low; Realize that by the high-speed isolated optocoupler forceful electric power isolates, and anti-interference effective during optocoupler work.In addition, because the own transmission delay of high-speed isolated optocoupler little (tPLH and tPHL be about 50ns) makes that the time-delay of detection signal is also little, the detection of frequency converter voltage is more accurate.
Description of drawings
Fig. 1 is schematic block circuit diagram of the present invention.
Embodiment
The realization of the object of the invention, functional characteristics and beneficial effect are described further below in conjunction with specific embodiment and accompanying drawing.
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
Embodiment of the invention frequency converter voltage testing circuit comprises divider resistance, single-chip microcomputer and photoelectrical coupler; The forceful electric power power supply of the ac input end of frequency converter major loop outputs to single-chip microcomputer after the divider resistance step-down, single-chip microcomputer is converted to digital signal with the above-mentioned voltage signal that collects, and outputs to frequency transformer main control system by photoelectrical coupler light current then.
The embodiment of the invention has been avoided adopting expensive sensor, and it is simple in structure, and components and parts are few, and structural behaviour is stable, and cost is low; Realize that by the high-speed isolated photoelectrical coupler forceful electric power isolates, and anti-interference effective during optocoupler work.In addition, because the own transmission delay of high-speed isolated optocoupler little (tPLH and tPHL be about 50ns) makes that the time-delay of detection signal is also little, the detection of frequency converter voltage is more accurate.
Claims (1)
1. a frequency converter voltage testing circuit comprises divider resistance, it is characterized in that: also comprise single-chip microcomputer and photoelectrical coupler; The forceful electric power power supply of the ac input end of frequency converter major loop outputs to single-chip microcomputer after the divider resistance step-down, single-chip microcomputer is converted to digital signal with the above-mentioned voltage signal that collects, and outputs to frequency transformer main control system by photoelectrical coupler light current then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102343162A CN103308756A (en) | 2013-06-14 | 2013-06-14 | Frequency changer voltage detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102343162A CN103308756A (en) | 2013-06-14 | 2013-06-14 | Frequency changer voltage detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103308756A true CN103308756A (en) | 2013-09-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013102343162A Pending CN103308756A (en) | 2013-06-14 | 2013-06-14 | Frequency changer voltage detection circuit |
Country Status (1)
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| CN (1) | CN103308756A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280598A (en) * | 2014-09-19 | 2015-01-14 | 合肥荣事达三洋电器股份有限公司 | Power supply detection method and detection system for microwave oven |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101533044A (en) * | 2009-04-10 | 2009-09-16 | 张洪霞 | Voltage detecting device of frequency converter for plasma separator |
| CN102169317A (en) * | 2006-12-11 | 2011-08-31 | 佳能株式会社 | Developing box, processing box and electrophotographic imaging device |
| CN203310906U (en) * | 2013-06-14 | 2013-11-27 | 浙江海振电子科技有限公司 | Frequency converter voltage detection circuit |
-
2013
- 2013-06-14 CN CN2013102343162A patent/CN103308756A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102169317A (en) * | 2006-12-11 | 2011-08-31 | 佳能株式会社 | Developing box, processing box and electrophotographic imaging device |
| CN101533044A (en) * | 2009-04-10 | 2009-09-16 | 张洪霞 | Voltage detecting device of frequency converter for plasma separator |
| CN203310906U (en) * | 2013-06-14 | 2013-11-27 | 浙江海振电子科技有限公司 | Frequency converter voltage detection circuit |
Non-Patent Citations (2)
| Title |
|---|
| 孔维涛等: "电网瞬时停电保持变频器母线电压的新方法", 《电工技术学报》 * |
| ***等: "用于变风量空调风机的温控型变频器", 《微特电机》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104280598A (en) * | 2014-09-19 | 2015-01-14 | 合肥荣事达三洋电器股份有限公司 | Power supply detection method and detection system for microwave oven |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130918 |