CN2694283Y - Isolated form synchronizing voltage metering circuit - Google Patents
Isolated form synchronizing voltage metering circuit Download PDFInfo
- Publication number
- CN2694283Y CN2694283Y CN 200420001029 CN200420001029U CN2694283Y CN 2694283 Y CN2694283 Y CN 2694283Y CN 200420001029 CN200420001029 CN 200420001029 CN 200420001029 U CN200420001029 U CN 200420001029U CN 2694283 Y CN2694283 Y CN 2694283Y
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- Prior art keywords
- operational amplifier
- isolated
- circuit
- direct current
- simulation
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Abstract
The utility model relates to an isolated form synchronizing voltage metering circuit improved by a direct current electric motor speed regulating device. The isolated form synchronizing voltage metering circuit is composed of an operational amplifier, a simulation multiway switch, a photoelectric coupler and an isolated operational amplifier. Electric network circuits U, V, W are connected with the electric voltage input terminal of the operational amplifier. The output terminals UV, VW attenuated are connected with the input terminal of the simulation multiway switch. The output terminal of the simulation multiway switch is connected with the photoelectric coupler. The control terminal of the photoelectric coupler is connected with the control circuit of a direct current speed regulating device. The other output terminal of the simulation multiway switch is connected with the input terminal of the isolated operational amplifier. A simulation voltage signal is outputted from the isolated operational amplifier and is sent into the simulation sampling circuit of the direct current speed regulating device. The utility model uses power mutually isolated to supply electricity. The input signal is isolated and transmitted through a photoelectric conversion circuit. Even if the operational amplifier of the synchronizing voltage metering circuit is damaged, the simulation sampling circuit of an SCM can not be affected.
Description
Technical field
The utility model belongs to the application technology of electronic technology in the Motor Control field, and it improves at the synchronizing voltage metering circuit of dc motor speed regulating device, is a kind of isolated form synchronizing voltage metering circuit.
Background technology
The synchronizing voltage metering circuit is used for detection of grid voltage in the dc motor speed regulating device, thereby determine the time of voltage signal through point of zero voltage, and then the trigger angle of definite direct current motor thyristor rectifier bridge, this circuit is crucial in the dc motor speed regulating device.At present mostly the circuit that adopts is that " Electrified Transmission " first phase in 2002 " analysis of the digital governing system of 6RA24 " (Wang Fu comes, Xu Ping) literary composition for example and analyze, physical circuit such as accompanying drawing 1, metering circuit is input as electrical network U, V, W three-phase voltage, by the subtraction circuit of forming by operational amplifier (1), make the synchronizing voltage testing circuit be output as two-way UV, VW line voltage.This two-route wire voltage is the sinusoidal signal of 50Hz being shown as the two-way voltage magnitude on the oscillograph in the frequency the in ± 5V scope, send into the analog acquisition circuit of forming by single-chip microcomputer or other microcontrollers then, output voltage signal by continuous collection synchronizing voltage circuit, just can determine the zero crossing of grid line voltage, and then the trigger angle of definite thyristor.This circuit is fully feasible in principle, if but the situation that generation operational amplifier or resistance damage will cause device to burn device damage.Such as: the operational amplifier 1 in the circuit damages, will make the proportionate relationship complete obiteration of subtraction circuit input signal and output signal, lost the attenuation of input signal, then the forceful electric power pressure in the electrical network can enter into the circuit of whole dc motor drive, burn other circuit components, arrangements for speed regulation are damaged.
Summary of the invention
The utility model purpose is to provide a kind of to be had forceful electric power and separates with light current, finishes the isolated form synchronizing voltage metering circuit of electrical isolation between synchronizing voltage metering circuit and single-chip simulation sample circuit.
The present invention adopts following technical scheme:
Isolated form synchronizing voltage metering circuit is made up of operational amplifier, analog multichannel switch, photoelectrical coupler and isolation operational amplifier, the voltage input end of power network line U, V, W concatenation operation amplifier, output terminal UV, VW after the decay connects the input end of analog multichannel switch, the output terminal of analog multichannel switch is connected to photoelectrical coupler, and the control end of photoelectrical coupler is connected with the control circuit of direct current speeder; Another output terminal of analog multichannel switch connects the input end of isolating operational amplifier, and analog voltage signal is sent into direct current speeder analog sampling circuit from the output of isolated form operational amplifier.
The present invention also adopts following technical scheme:
Photoelectrical coupler can adopt more than one.
Photoelectrical coupler and analog multichannel switch are communicated with the positive 5V power supply of direct current speeder isolated from power.
The 15V power supply UNICOM that isolates operational amplifier and direct current speeder isolated from power.
The utility model order advantage is to connect by the isolated form operational amplifier with photoelectricity isolation characteristic between direct current speeder single-chip simulation sample circuit, use the power supply power supply of isolating mutually, input signal is finished the transmission of input voltage to output voltage by the photoelectric switching circuit of isolating operational amplifier inside, the synchronizing voltage testing circuit also uses with the power supply of direct current speeder isolated from power and powers simultaneously, even therefore the operational amplifier of synchronizing voltage metering circuit damages, can not exert an influence to the single-chip simulation sample circuit.
Description of drawings
Fig. 1 is the synchronizing voltage metering circuit structural drawing that uses at present;
Fig. 2 is the utility model circuit structure diagram.
Embodiment
Below in conjunction with accompanying drawing 2 concrete being described in detail to improving circuit.
Line voltage U, V, W three-phase voltage are connected to three input ends of the voltage attenuation circuit of being made up of operational amplifier 1 and operational amplifier 2, the variation range of line voltage U V, VW after the decay at 0V between the 5V, UV is the line voltage from the 6 pin output of operational amplifier 1, and VW is the line voltage from the 6 pin output of operational amplifier 2.Be connected respectively to 13 pin of analog multichannel switch 3 and the input end of analog signal of 4 pin then.DC1 is connected to the 2nd pin of photoelectrical coupler 5, and DC2 is connected to the 2nd pin of photoelectrical coupler 6, and DC3 is connected to the 2nd pin of photoelectrical coupler 7, and DC1, DC2, DC3 are the channel selecting that is used for multiway analog switch from the Single-chip Controlling signal.The output terminal of analog multichannel switch is connected with input end 15 pin of isolating operational amplifier 4, exports from 7 pin of isolated form operational amplifier through the analog voltage signal of isolating, and sends at last in the direct current speeder analog sampling circuit and carries out sampling processing.
The utility model operational amplifier can be selected the common operational amplifier of positive and negative 15V power supply commonly used for use, as OP07; The isolated form operational amplifier can use ISO124, and its cheap performance is also fine; Photoelectrical coupler can select for use HP6N137 to have the transfer rate of 1MHz, is convenient to analog multichannel switch is operated fast; Analog multichannel switch can be selected CD4051.ISP5 is the positive 5V power supply with the direct current speeder isolated from power in the circuit; ISP15 is the positive 15V power supply with the direct current speeder isolated from power; ISN15 is the negative 15V power supply of isolating with direct current speeder; AIN is for through isolating the output signal of the synchronizing voltage metering circuit that operational amplifier isolated; DC1, DC2, DC3 are the input control signal of photoelectrical coupler.
Claims (4)
1, a kind of isolated form synchronizing voltage metering circuit, form by operational amplifier (1,2), analog multichannel switch (3), photoelectrical coupler (5,6,7) and isolation operational amplifier (4), it is characterized in that: the voltage input end of power network line (U, V, W) concatenation operation amplifier (1,2), output terminal after the decay (UV, VW) connects the input end of analog multichannel switch (3), the output terminal of analog multichannel switch (3) is connected to photoelectrical coupler (5,6,7), and the control end of photoelectrical coupler (5,6,7) is connected with the control circuit of direct current speeder; Another output terminal of analog multichannel switch (3) connects the input end of isolating operational amplifier (4), and analog voltage signal is sent into direct current speeder analog sampling circuit from isolated form operational amplifier (4) output.
2, a kind of isolated form synchronizing voltage metering circuit according to claim 1, it is characterized in that: photoelectrical coupler (5,6,7) can adopt more than one.
3, a kind of isolated form synchronizing voltage metering circuit according to claim 1 is characterized in that: photoelectrical coupler (5,6,7) and analog multichannel switch (3) are communicated with the positive 5V power supply of direct current speeder isolated from power.
4, a kind of isolated form synchronizing voltage metering circuit according to claim 1 is characterized in that: the 15V power supply UNICOM that isolates operational amplifier (4) and direct current speeder isolated from power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420001029 CN2694283Y (en) | 2004-01-13 | 2004-01-13 | Isolated form synchronizing voltage metering circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420001029 CN2694283Y (en) | 2004-01-13 | 2004-01-13 | Isolated form synchronizing voltage metering circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2694283Y true CN2694283Y (en) | 2005-04-20 |
Family
ID=34767030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420001029 Expired - Fee Related CN2694283Y (en) | 2004-01-13 | 2004-01-13 | Isolated form synchronizing voltage metering circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2694283Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735908A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Network voltage sampling circuit |
| CN102944736A (en) * | 2012-11-22 | 2013-02-27 | 江苏大为科技股份有限公司 | Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings |
| CN109917305A (en) * | 2019-02-28 | 2019-06-21 | 科世达（上海）管理有限公司 | A kind of isolation signals detection control apparatus |
-
2004
- 2004-01-13 CN CN 200420001029 patent/CN2694283Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735908A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Network voltage sampling circuit |
| CN102944736A (en) * | 2012-11-22 | 2013-02-27 | 江苏大为科技股份有限公司 | Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings |
| CN109917305A (en) * | 2019-02-28 | 2019-06-21 | 科世达（上海）管理有限公司 | A kind of isolation signals detection control apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050420 Termination date: 20130113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |