CN201955389U - Single-phase alternating-current voltage and current acquisition circuit - Google Patents
Single-phase alternating-current voltage and current acquisition circuit Download PDFInfo
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- CN201955389U CN201955389U CN2010206747612U CN201020674761U CN201955389U CN 201955389 U CN201955389 U CN 201955389U CN 2010206747612 U CN2010206747612 U CN 2010206747612U CN 201020674761 U CN201020674761 U CN 201020674761U CN 201955389 U CN201955389 U CN 201955389U
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Abstract
The utility model provides a single-phase alternating-current voltage and current acquisition circuit, which comprises a voltage isolation detection circuit and a current isolation detection circuit. The voltage isolation detection circuit and the current isolation detection circuit are respectively connected with multiple data select switch circuits which output voltage and current sample signals, the voltage and current sample signals simultaneously pass through a voltage and current signal amplifier circuit which outputs voltage and current analog signals, and the output voltage and current analog signals pass through an A/D (analog/digital) conversion circuit which outputs digital signals required in detection. The single-phase alternating-current voltage and current acquisition circuit has the advantages that voltage and current signals from single-phase alternating-current 220V voltage and circuit current thereof are acquired through a common electronic transformer and a common mutual inductor, the acquired signals are converted into digital signals which are transmitted to a logic operation processing circuit, the problems of poor circuit precision and low interference resistance can be solved effectively, and the single-phase alternating-current voltage and current acquisition circuit is high in precision, high in interference resistance, capable of realizing electrical isolation, fine in linearity, and widely applicable to voltage and current acquisition of a traction power supply system.
Description
Technical field
The utility model relates to a kind of voltage and current Acquisition Circuit, is used for the single-phase AC electric current and voltage Acquisition Circuit of the collection output of single-phase 220V voltage and current.
Background technology
The present railway signal power supply screen field frequency collection mode that adopts synchronizing signal and V/F to combine mostly for the acquisition mode of single-phase alternating current, and the object of the collection of supply voltage rail and electric current mostly is towed electric power system.Towed electric power system load variations is bigger, higher hamonic wave is seriously polluted, after external power grid is disturbed, synchronously output frequency be not 50HZ so easily synchronous pulsewidth be divided into several pulsewidths and, and only corresponding one of them pulsewidth output data of software collection, the pulse width variations output data also becomes, cause the accuracy of Acquisition Circuit very poor, even the mess code situation appears, through the statistical conditions that the user uses, relates to more than the collection plate failure condition accounts for 4 one-tenth.
Summary of the invention
In order to solve the problem that exists in the above-mentioned technology, the utility model provides a kind of single-phase AC electric current and voltage Acquisition Circuit, and it is anti-interference strong to be beneficial to realize that voltage and current is gathered, acquisition precision height, the simple purpose of circuit structure.
For realizing the purpose of invention, the technical scheme of this practical novel employing provides a kind of single-phase AC electric current and voltage Acquisition Circuit, this Acquisition Circuit is connected among the detected voltage circuit, wherein: this Acquisition Circuit includes the voltage isolation testing circuit, the electric current isolation detection circuit, and be connected with the multichannel data selected on-off circuit respectively, multichannel data selected on-off circuit output voltage, current sampling signal, described voltage, current sampling signal is simultaneously through voltage and current signal amplification circuit output voltage, current analog signal, the voltage of output, current analog signal is through modulus A/D change-over circuit, and output detects needed digital signal.
This practical novel effect is that single-phase AC 220V voltage and loop current thereof are carried out the voltage and current signals collecting by ordinary electronic transformer and mutual inductor, the voltage and current signal that collects is through the voltage and current signal amplification circuit with after mould/number A/D change-over circuit converts digital signal to, send into the logical operation treatment circuit, by nearly 1 year use, can effectively solve the Acquisition Circuit low precision, the problem that antijamming capability is weak.Have the precision height, strong interference immunity, and realized electrical isolation having good linearty, can be widely used in the collection of the voltage and current of towed electric power system.
Description of drawings
Fig. 1 is that this practical novel voltage and current is gathered the overall flow block diagram;
Fig. 2 is that this practical novel voltage signal is isolated Acquisition Circuit figure;
Fig. 3 is that this practical novel current signal is isolated Acquisition Circuit figure;
Fig. 4 is this practical novel differential type amplifying circuit topological structure.
Embodiment
Below in conjunction with accompanying drawing and instantiation single-phase AC electric current and voltage Acquisition Circuit structure of the present utility model is further described.
Single-phase AC electric current and voltage Acquisition Circuit of the present utility model mainly is to have adopted friendship/straight AC/DC conversion to change the mode that combines with digital-to-analogue A/D and carry out the voltage and current collection, changed in the past the acquisition mode by synchronizing signal and voltage/frequency V/F.
As shown in Figure 1, single-phase AC electric current and voltage Acquisition Circuit structure of the present utility model: this Acquisition Circuit is connected among the detected voltage circuit, this Acquisition Circuit includes the voltage isolation testing circuit, the electric current isolation detection circuit, and be connected with the multichannel data selected on-off circuit respectively, multichannel data selected on-off circuit output voltage, current sampling signal, described voltage, current sampling signal is simultaneously through voltage and current signal amplification circuit output voltage, current analog signal, the voltage of output, current analog signal is through modulus A/D change-over circuit, and output detects needed digital signal.
The voltage isolation testing circuit is connected to detected voltage circuit, its output terminal output voltage sampled signal.The electric current isolation detection circuit is connected to the sensed current loop, its output terminal output current sampled signal.The voltage and current signal amplification circuit is connected to voltage isolation testing circuit and electric current isolation detection circuit by the multichannel data switch, its output voltage current signal.Modulus A/D change-over circuit circuit is connected to the voltage and current signal amplifying circuit, and its output detects needed digital signal.Logical operation circuit is connected to modulus A/D conversion, and the digital signal that collects is carried out logical operation.The modulus A/D change-over circuit that described logical operation circuit adopts is that 52 single-chip microcomputers are as core controller.
As shown in Figure 2; the voltage isolation testing circuit comprises electronic transformer; its input meets the live wire L and the zero line N of the single-phase AC voltage that will sample, and its output terminal is sent into prime amplifier by resistance and protective circuit of diode, and the concrete prime amplifier model that adopts is OP07.
Shown in Fig. 1,3, the electric current isolation detection circuit comprises current transformer, directly inserts current return, and it is exported by sending into prime amplifier behind the protective circuit of diode.
The CD4051 integrated chip that the multichannel data switch adopts can be controlled the timesharing of voltage and current signal and send into the voltage and current signal amplification circuit, and signal is selected in its chip output, is exported by 52 single-chip microprocessor MCU in the logical operation circuit.
As shown in Figure 4, be the voltage and current signal amplification circuit, this circuit topological structure is the differential type amplifying circuit, has also effectively avoided the temperature drift of amplifier, has improved the accurate of collection result to a great extent.
Claims (3)
1. single-phase AC electric current and voltage Acquisition Circuit, this Acquisition Circuit is connected among the detected voltage circuit, it is characterized in that: this Acquisition Circuit includes voltage isolation testing circuit, electric current isolation detection circuit, and be connected with the multichannel data selected on-off circuit respectively, multichannel data selected on-off circuit output voltage, current sampling signal, described voltage, current sampling signal are simultaneously through voltage and current signal amplification circuit output voltage, current analog signal, the voltage of output, current analog signal are through modulus A/D change-over circuit, and output detects needed digital signal.
2. single-phase AC electric current and voltage Acquisition Circuit according to claim 1 is characterized in that: described multi-channel analog data switch circuit adopts the CD4051 chip.
3. single-phase AC electric current and voltage Acquisition Circuit according to claim 1 is characterized in that: the modulus A/D change-over circuit that described logical operation circuit adopts is that 52 single-chip microcomputers are as core controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206747612U CN201955389U (en) | 2010-12-22 | 2010-12-22 | Single-phase alternating-current voltage and current acquisition circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206747612U CN201955389U (en) | 2010-12-22 | 2010-12-22 | Single-phase alternating-current voltage and current acquisition circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201955389U true CN201955389U (en) | 2011-08-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206747612U Expired - Fee Related CN201955389U (en) | 2010-12-22 | 2010-12-22 | Single-phase alternating-current voltage and current acquisition circuit |
Country Status (1)
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| CN (1) | CN201955389U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102551881A (en) * | 2012-02-27 | 2012-07-11 | 安徽英特电子有限公司 | Output power monitoring circuit of high frequency electrotome |
| CN102590602A (en) * | 2012-02-13 | 2012-07-18 | 西安爱邦电气有限公司 | Signal processing method by adopting public processing circuit during collection of alternating-current voltage and current |
| CN102608404A (en) * | 2012-03-13 | 2012-07-25 | 上海诺雅克电气有限公司 | Voltage sampling circuit and controller applicable to dual-power automatic transfer switch |
| CN102914691A (en) * | 2012-10-19 | 2013-02-06 | 冶金自动化研究设计院 | Device with adaptive function and method for detecting three-phase alternating current voltage and current |
| 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 |
| CN105572465A (en) * | 2015-12-24 | 2016-05-11 | 刘志海 | Electric supply power parameter detection system |
| CN105588971A (en) * | 2015-09-30 | 2016-05-18 | 海信（山东）空调有限公司 | Alternating current voltage sampling circuit and method |
| CN109947070A (en) * | 2019-04-28 | 2019-06-28 | 广东德圳智能技术有限公司 | Production equipment collecting method and its data communications processor |
-
2010
- 2010-12-22 CN CN2010206747612U patent/CN201955389U/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590602A (en) * | 2012-02-13 | 2012-07-18 | 西安爱邦电气有限公司 | Signal processing method by adopting public processing circuit during collection of alternating-current voltage and current |
| CN102551881A (en) * | 2012-02-27 | 2012-07-11 | 安徽英特电子有限公司 | Output power monitoring circuit of high frequency electrotome |
| CN102551881B (en) * | 2012-02-27 | 2013-09-11 | 安徽英特电子有限公司 | Output power monitoring circuit of high frequency electrotome |
| CN102608404A (en) * | 2012-03-13 | 2012-07-25 | 上海诺雅克电气有限公司 | Voltage sampling circuit and controller applicable to dual-power automatic transfer switch |
| CN102608404B (en) * | 2012-03-13 | 2014-12-10 | 上海诺雅克电气有限公司 | Voltage sampling circuit and controller applicable to dual-power automatic transfer switch |
| CN102914691A (en) * | 2012-10-19 | 2013-02-06 | 冶金自动化研究设计院 | Device with adaptive function and method for detecting three-phase alternating current voltage and current |
| CN102914691B (en) * | 2012-10-19 | 2014-12-03 | 冶金自动化研究设计院 | Device with adaptive function and method for detecting three-phase alternating current voltage and current |
| 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 |
| CN105588971A (en) * | 2015-09-30 | 2016-05-18 | 海信（山东）空调有限公司 | Alternating current voltage sampling circuit and method |
| CN105572465A (en) * | 2015-12-24 | 2016-05-11 | 刘志海 | Electric supply power parameter detection system |
| CN109947070A (en) * | 2019-04-28 | 2019-06-28 | 广东德圳智能技术有限公司 | Production equipment collecting method and its data communications processor |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20110831 Termination date: 20161222 |
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| CF01 | Termination of patent right due to non-payment of annual fee |