CN102944736A - Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings - Google Patents
Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings Download PDFInfo
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- CN102944736A CN102944736A CN2012104784428A CN201210478442A CN102944736A CN 102944736 A CN102944736 A CN 102944736A CN 2012104784428 A CN2012104784428 A CN 2012104784428A CN 201210478442 A CN201210478442 A CN 201210478442A CN 102944736 A CN102944736 A CN 102944736A
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Abstract
The invention provides a circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings. The circuit comprises a current sampling circuit, an analog selection circuit, an analog optical coupling circuit which are connected successively, a secondary differential amplification circuit, an impedance conversion circuit, an effective value conversion circuit and a data processing unit. The current sampling circuit is connected in series in a load by using a low resistance wire wound resistor to send a plurality of channels of low voltage signals to the analog selection circuit, and the analog selection circuit completes more choose one in time division; the analog optical coupling circuit separates a voltage signal portion and a data processing portion on left and right sides; the effective value conversion circuit converts alternating current voltage signals into direct current voltage signals; and the data processing unit samples and calculates the direct current signals to obtain actual current values. The circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings has the advantages that the sampling reliability is high, loaded effects are few, multichannel integration is facilitated, and the cost is low; the system disturbance resisting capability is high; the sampling accuracy is high, and the range is wide; and small signal processing distortion is small. The whole system circuit is simple and easy to implement.
Description
Technical field
The present invention relates to analyze and measure control field, specifically a kind of wide region high-precision multi-path current detection circuit based on optocoupler.
Background technology
In road traffic signal controller, need to carry out real-time sample control to the alternating current numerical value of every street lamp driver output, with the correctness of guaranteeing to export and the situation of change of monitoring load current, the security that improves traffic signal controlling machine.But a lot of these classes are used and all are based on the transformer feedback sample at present, and transformer not only volume is large, and the large and price of weight has brought very burden for follow-up circuit board making and processing.Also have and adopt Hall element to sample, but the Hall element cost is high, volume is unfavorable for greatly the hyperchannel operating position.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of multi-channel high-accuracy alternating current numerical value testing circuit is provided, its antijamming capability is strong, and is simple in structure, use cost is low, high isolation, and precision is high, measurement range is wide, and is safe and reliable, and volume is little, and to be easy to hyperchannel integrated.
According to technical scheme provided by the invention, described wide region high-precision multi-path current detection circuit based on optocoupler comprises: the current sampling circuit, analog selection circuit, optocoupler circuit, secondary differential amplifier circuit, impedance inverter circuit, effective value translation circuit, the data processing unit that connect successively; The output of Multi-current Sampling circuit is connected to the analog selection circuit, described current sampling circuit uses the wire-wound resistor of the little resistance of high precision to be connected in the load, produce voltage difference by load current at the two ends of resistance, then this multichannel small voltage signal is sent into the analog selection circuit, finish the function of multiselect one by the timesharing of analog selection circuit, the selection control end of analog selection circuit links to each other with data processing unit after by digital light-coupled isolation; Described optocoupler circuit is finished the isolation of the right and left voltage signal part and data processing section, and the elementary amplification of finishing voltage signal; Described secondary differential amplifier circuit is finished the again amplification of voltage signal; Described effective value translation circuit is finished ac voltage signal and is transformed into d. c. voltage signal, and the A/D input end of the output of effective value translation circuit and data processing unit links to each other; Described data processing unit is finished the A/D sampling of direct current signal, then the result of sampling is carried out analytic operation and draws actual current value, and outwards send data by Peripheral Interface.
Wherein, one road current sampling circuit comprises wire-wound resistor and sampling protective resistance, and the live wire of wire-wound resistor one end and alternating current links to each other, and the other end links to each other with bulb and is connected to a road of analog selection circuit by the sampling protective resistance and inputs.
Described analog selection circuit comprises that multichannel selects chip CD4051, and 16 pin of CD4051 link to each other with+5V power supply, and the power supply of 7 pin and-5V links to each other, and the power supply of 8 pin, 6 pin and 0V links to each other and links to each other with the live wire of alternating current; 13,14,15,12,1,5,2,4 pin of CD4051 are used for connecting the Multi-current Sampling circuit; 9 pin of CD4051,10 pin, 11 pin are that 3 scale-of-two are selected control end, by linking to each other with data processing unit after the digital light-coupled isolation, are used for selecting a road in 8 tunnel inputs to carry out circuit sampling; 3 pin of CD4051 are that the input end of output pin and optocoupler circuit links to each other.
Described optocoupler circuit comprises isolated amplifier HCPL7840,3 pin of the 9th resistance one end and described CD4051 link to each other, 2 pin of the 9th resistance other end and HCPL7840 link to each other and link to each other with the cathode terminal of the first diode and the anode tap of the second diode, pull down to the 0V current potential by the first diode and the second diode; 1 pin of HCPL7840 with are connected pin and connect respectively the operating voltage of the right and left voltage signal part and data processing section, 3 pin, 4 pin of HCPL7840 connect the 0V current potential, 5 pin connect the ground of data processing section, 6 pin of HCPL7840 and 7 pin are negative pole and positive poles of difference output, link to each other with the input of secondary differential amplifier circuit respectively.
Described secondary differential amplifier circuit comprises the first operational amplifier, and the first operational amplifier in-phase input end connects the positive pole that optocoupler circuit difference is exported by the tenth resistance, and passes through the parallel branch ground connection of the 12 resistance and the first electric capacity; The first operational amplifier inverting input connects the negative pole of optocoupler circuit difference output by the 11 resistance, and by the 13 resistance be connected the parallel branch of electric capacity and connect the output terminal of the first operational amplifier; The output terminal of the first operational amplifier is the output stage of secondary differential amplifier circuit, links to each other with the input end of impedance inverter circuit.
Described impedance inverter circuit comprises the second operational amplifier, the in-phase input end of the second operational amplifier links to each other with the output terminal of the first operational amplifier, the inverting input of the second operational amplifier links to each other by the output terminal of the 14 resistance and the second operational amplifier, the output terminal of the second operational amplifier is the output terminal of impedance inverter circuit, links to each other with the input end of effective value translation circuit.
Described effective value translation circuit comprises effective measurement value transformer AD536AJH, and 4 pin of AD536AJH pass through the output terminal that the 15 resistance connects impedance inverter circuit, and pulls down to ground by the 3rd electric capacity; 1 pin of AD536AJH all links to each other with ground with 2 pin, and 3 pin of AD536AJH connect positive source, and 5 pin of D536AJH connect power cathode, and 6 pin of AD536AJH link to each other by 3 pin of the 6th electric capacity and AD536AJH; And 8 pin of AD536AJH link to each other and 10 pin by the 4th electric capacity and AD536AJH link to each other one end of the 17 resistance, and the other end of the 17 resistance pulls down to ground by the 7th electric capacity, and the output terminal of value transform circuit is imitated in conduct; One end of the 16 resistance and 9 pin of AD536AJH link to each other, and pull down to ground by the 5th electric capacity, and 10 pin of the other end of the 16 resistance and AD536AJH link to each other; The output terminal of effective value translation circuit links to each other with the A/D of data processing unit end.
Described data processing unit can adopt the STM32F103RC chip.
Advantage of the present invention is: the resistance by the little resistance of connecting comes sample rate current, so that the reliability of sampling is high, little on the impact of load, sensing range is wide, and it is integrated to be convenient to hyperchannel, and cost is low; Use the isolation of optocoupler settling signal, so that system is safer, antijamming capability is strong; Adopt 10 A/D, so that sampling precision is high, wide ranges; Adopt the effective value translation circuit so that the small signal process distortion is little, accuracy is high.The whole system circuit is simple, and thinking is clear and definite, easily implements.
Description of drawings
Fig. 1 is circuit structure block diagram of the present invention.
Fig. 2 current sampling circuit and analog selection circuit theory diagrams.
Fig. 3 optocoupler circuit, secondary differential amplifier circuit, impedance inverter circuit schematic diagram.
Fig. 4 effective value translation circuit schematic diagram.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, described wide region high-precision multi-path current detection circuit based on optocoupler comprises: the current sampling circuit, analog selection circuit, optocoupler circuit, secondary differential amplifier circuit, impedance inverter circuit, effective value translation circuit, the data processing unit that connect successively.Finished the isolation of left side voltage signal part and right side data processing section by described optocoupler circuit.
Current sample partly is by the Multi-current Sampling the electric circuit constitute, described current sampling circuit uses is that the wire-wound resistor of the little resistance of high precision is connected in the load, produce voltage difference by load current at the two ends of resistance, then this multichannel small voltage signal is sent into the analog selection circuit; The function of multiselect one is finished in the timesharing of described analog selection circuit, and the output of described analog selection circuit is connected to the optocoupler circuit; Described optocoupler circuit is finished the isolation of voltage signal part and data processing section, improves security of system and antijamming capability, and suitably finishes elementary amplification; The output of optocoupler circuit links to each other with secondary differential amplifier circuit, and described secondary differential amplifier circuit is finished the again amplification of voltage signal, can adjust the voltage signal enlargement factor here and reach the scope that we want; The output of secondary differential amplifier circuit links to each other with impedance inverter circuit, and it is low that described impedance inverter circuit makes the signal of input have output impedance, and the characteristics that driving force is strong are convenient to the input of subsequent process circuit, improves accuracy and antijamming capability; The output of described impedance inverter circuit links to each other with the effective value translation circuit, and described effective value translation circuit is finished ac voltage signal and is transformed into d. c. voltage signal; The A/D input end of the output of effective value translation circuit and data processing unit links to each other; Described data processing unit is finished the A/D sampling of direct current signal, and then the result of sampling is carried out analytic operation and draw actual current value, owing to adopt 10 A/D, so precision can reach 1/1000 precision.Described data processing unit can be crossed serial ports to the data communication device of processing and send to other display terminal.
As shown in Figure 2, described current sampling circuit is comprised of the wire-wound resistor RL1 and the sampling protective resistance R1 that are connected in the load circuit.Wire-wound resistor RL1 is the little resistance sampling resistor of high precision; the live wire AC/L of its end and alternating current links to each other; the other end links to each other with traffic lights LAMP1 and is connected to a road of analog selection circuit by sampling protective resistance R1 and inputs, and the needs on border can reach 8 road such sample circuits factually.
Described analog selection circuit comprises that multichannel selects chip CD4051, and 16 pin of CD4051 link to each other with+5V power supply, and the power supply of 7 pin and-5V links to each other, and the power supply of 8 pin, 6 pin and 0V links to each other and links to each other with the live wire AC/L of alternating current; 13,14,15,12,1,5,2,4 pin of CD4051 can connect nearly 8 road current sampling circuits; 9 pin of CD4051,10 pin, 11 pin are that 3 scale-of-two are selected control end, by linking to each other with data processing unit after the digital light-coupled isolation, are used for selecting a road in 8 tunnel inputs to carry out circuit sampling; 3 pin of CD4051 are that the input end of output pin and optocoupler circuit links to each other.
As shown in Figure 3, described optocoupler circuit comprises isolated amplifier HCPL7840,3 pin of the 9th resistance R 9 one ends and described CD4051 link to each other, 2 pin of the 9th resistance R 9 other ends and HCPL7840 link to each other and link to each other with the cathode terminal of the first diode D1 and the anode tap of the second diode D2, pull down to the 0V current potential by the first diode D1 and the second diode D2; 1 pin of HCPL7840 (is two groups of incoherent power supplys with being connected the operating voltage that pin connects respectively the right and left voltage signal part and data processing section, their ground keeps apart), 3 pin, 4 pin of HCPL7840 connect the 0V current potential, 5 pin connect the ground of data processing section, 6 pin of HCPL7840 and 7 pin are negative pole and positive poles of difference output, link to each other with the input of secondary differential amplifier circuit respectively.
Described secondary differential amplifier circuit is made of dual operational amplifier LM258 with impedance inverter circuit: an end of the tenth resistance R 10 and 7 pin of HCPL7840 link to each other, 3 pin of the other end and LM258 link to each other, and pull down to ground by the parallel branch of the 12 resistance R 12 and the first capacitor C 1; One end of the 11 resistance R 11 and 6 pin of HCPL7840 link to each other, 2 pin of the other end and LM258 link to each other, and link to each other by the 13 the resistance R 13 and parallel branch of the second capacitor C 2 and 1 pin of LM258,1 pin of LM258 is the output stage of secondary differential amplifier circuit, links to each other with the input end of impedance inverter circuit.Described impedance inverter circuit comprises: 5 pin of LM258 link to each other with 1 pin, and 6 pin link to each other with 7 pin by the 14 resistance R 14, and 7 pin of LM258 are output terminals of impedance inverter circuit, link to each other with the input end of effective value translation circuit.
As shown in Figure 4, described effective value translation circuit mainly is to be made of effective value transducer AD536AJH: an end of the 15 resistance R 15 and 7 pin of LM258 link to each other, and 4 pin of the other end and AD536AJH link to each other, and pull down to ground by the 3rd capacitor C 3.1 pin of AD536AJH all links to each other with ground with 2 pin.3 pin of AD536AJH link to each other with positive source+V50.5 pin of AD536AJH link to each other with power cathode-V50.6 pin of AD536AJH link to each other by 3 pin of the 6th capacitor C 6 and AD536AJH.7 pin of AD536AJH are unsettled not to be connect.And 8 pin of AD536AJH link to each other and 10 pin by the 4th capacitor C 4 and AD536AJH link to each other one end of the 17 resistance R 17, and the other end of the 17 resistance R 17 pulls down to ground by the 7th capacitor C 7, and the output terminal of value transform circuit is imitated in conduct.One end of the 16 resistance R 16 and 9 pin of AD536AJH link to each other, and pull down to ground by the 5th capacitor C 5, and 10 pin of the other end of the 16 resistance R 16 and AD536AJH link to each other.The output of effective value translation circuit links to each other with the A/D of data processing unit end.
Described data processing unit mainly is that the STM32F103RC chip by ST company consists of: STM32F103RC inside is integrated with 10 A/D unit, can carry out the A/D conversion to the output of effective value translation circuit, and carry out the calculating of the actual current value size of finishing dealing with of data, and the current value of each passage reality is sent to display terminal by serial ports.
Claims (8)
1. based on the wide region high-precision multi-path current detection circuit of optocoupler, it is characterized in that: comprise the current sampling circuit, analog selection circuit, optocoupler circuit, secondary differential amplifier circuit, impedance inverter circuit, effective value translation circuit, the data processing unit that connect successively; The output of Multi-current Sampling circuit is connected to the analog selection circuit, described current sampling circuit uses the wire-wound resistor of the little resistance of high precision to be connected in the load, produce voltage difference by load current at the two ends of resistance, then this multichannel small voltage signal is sent into the analog selection circuit, finish the function of multiselect one by the timesharing of analog selection circuit, the selection control end of analog selection circuit links to each other with data processing unit after by digital light-coupled isolation; Described optocoupler circuit is finished the isolation of the right and left voltage signal part and data processing section, and the elementary amplification of finishing voltage signal; Described secondary differential amplifier circuit is finished the again amplification of voltage signal; Described effective value translation circuit is finished ac voltage signal and is transformed into d. c. voltage signal, and the A/D input end of the output of effective value translation circuit and data processing unit links to each other; Described data processing unit is finished the A/D sampling of direct current signal, then the result of sampling is carried out analytic operation and draws actual current value, and outwards send data by Peripheral Interface.
2. as claimed in claim 1 based on the wide region high-precision multi-path current detection circuit of optocoupler; it is characterized in that; one road current sampling circuit comprises wire-wound resistor (RL1) and sampling protective resistance (R1); the live wire of wire-wound resistor (RL1) end and alternating current links to each other, and the other end links to each other with bulb and is connected to a road of analog selection circuit by sampling protective resistance (R1) and inputs.
3. as claimed in claim 1 based on the wide region high-precision multi-path current detection circuit of optocoupler, it is characterized in that, described analog selection circuit comprises multichannel selection chip CD4051,16 pin of CD4051 link to each other with+5V power supply, the power supply of 7 pin and-5V links to each other, and the power supply of 8 pin, 6 pin and 0V links to each other and links to each other with the live wire of alternating current; 13,14,15,12,1,5,2,4 pin of CD4051 are used for connecting the Multi-current Sampling circuit; 9 pin of CD4051,10 pin, 11 pin are that 3 scale-of-two are selected control end, by linking to each other with data processing unit after the digital light-coupled isolation, are used for selecting a road in 8 tunnel inputs to carry out circuit sampling; 3 pin of CD4051 are that the input end of output pin and optocoupler circuit links to each other.
4. as claimed in claim 3 based on the wide region high-precision multi-path current detection circuit of optocoupler, it is characterized in that, described optocoupler circuit comprises isolated amplifier HCPL7840,3 pin of the 9th resistance (R9) end and described CD4051 link to each other, 2 pin of the 9th resistance (R9) other end and HCPL7840 link to each other and link to each other with the cathode terminal of the first diode (D1) and the anode tap of the second diode (D2), pull down to the 0V current potential by the first diode (D1) and the second diode (D2); 1 pin of HCPL7840 with are connected pin and connect respectively the operating voltage of the right and left voltage signal part and data processing section, 3 pin, 4 pin of HCPL7840 connect the 0V current potential, 5 pin connect the ground of data processing section, 6 pin of HCPL7840 and 7 pin are negative pole and positive poles of difference output, link to each other with the input of secondary differential amplifier circuit respectively.
5. as claimed in claim 4 based on the wide region high-precision multi-path current detection circuit of optocoupler, it is characterized in that, described secondary differential amplifier circuit comprises the first operational amplifier, the first operational amplifier in-phase input end connects the positive pole that optocoupler circuit difference is exported by the tenth resistance (R10), and passes through the parallel branch ground connection of the 12 resistance (R12) and the first electric capacity (C1); The first operational amplifier inverting input connects the negative pole of optocoupler circuit difference output by the 11 resistance (R11), and by the 13 resistance (R13) be connected the parallel branch of electric capacity (C2) and connect the output terminal of the first operational amplifier; The output terminal of the first operational amplifier is the output stage of secondary differential amplifier circuit, links to each other with the input end of impedance inverter circuit.
6. as claimed in claim 5 based on the wide region high-precision multi-path current detection circuit of optocoupler, it is characterized in that, described impedance inverter circuit comprises the second operational amplifier, the in-phase input end of the second operational amplifier links to each other with the output terminal of the first operational amplifier, the inverting input of the second operational amplifier links to each other by the output terminal of the 14 resistance (R14) and the second operational amplifier, the output terminal of the second operational amplifier is the output terminal of impedance inverter circuit, links to each other with the input end of effective value translation circuit.
7. as claimed in claim 6 based on the wide region high-precision multi-path current detection circuit of optocoupler, it is characterized in that, described effective value translation circuit comprises effective measurement value transformer AD536AJH, 4 pin of AD536AJH pass through the output terminal that the 15 resistance (R15) connects impedance inverter circuit, and pull down to ground by the 3rd electric capacity (C3); 1 pin of AD536AJH all links to each other with ground with 2 pin, 3 pin of AD536AJH connect positive source (+V50), 5 pin of D536AJH connect power cathode, and (V50), 6 pin of AD536AJH link to each other by 3 pin of the 6th electric capacity (C6) and AD536AJH; And 8 pin of AD536AJH link to each other and 10 pin by the 4th electric capacity (C4) and AD536AJH link to each other one end of the 17 resistance (R17), the other end of the 17 resistance (R17) pulls down to ground by the 7th electric capacity (C7), and as the output terminal of imitating the value transform circuit; One end of the 16 resistance (R16) and 9 pin of AD536AJH link to each other, and pull down to ground by the 5th electric capacity (C5), and the other end of the 16 resistance (R16) and 10 pin of AD536AJH link to each other; The output terminal of effective value translation circuit links to each other with the A/D of data processing unit end.
8. as claimed in claim 1 based on the wide region high-precision multi-path current detection circuit of optocoupler, it is characterized in that described data processing unit adopts the STM32F103RC chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210478442.8A CN102944736B (en) | 2012-11-22 | 2012-11-22 | Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings |
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| CN201210478442.8A CN102944736B (en) | 2012-11-22 | 2012-11-22 | Circuit for detecting wide-range, high-precision and multichannel currents based on optical couplings |
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| CN102944736B CN102944736B (en) | 2014-11-05 |
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| CN103543319A (en) * | 2013-09-06 | 2014-01-29 | 国家电网公司 | High-precision fast measuring circuit and method for wide-range currents in power system |
| CN104374995A (en) * | 2014-11-17 | 2015-02-25 | 擎翌(上海)智能科技有限公司 | 220 VAC load current detecting circuit |
| CN106645927A (en) * | 2017-01-23 | 2017-05-10 | 上海理工大学 | Power detection circuit for switching power supply |
| CN107192958A (en) * | 2017-05-26 | 2017-09-22 | 上海空间电源研究所 | The method of testing failed for solar battery array hot vacuum environment |
| CN109387691A (en) * | 2018-12-14 | 2019-02-26 | 中核新科（天津） 精密机械制造有限公司 | The atomic low current linear measuring circuit of femto-ampere grade |
| CN110032114A (en) * | 2019-04-24 | 2019-07-19 | 江苏泰坤环保科技有限公司 | A kind of high-precision analog signal acquisition processing circuit |
| CN113949449A (en) * | 2021-09-24 | 2022-01-18 | 昂纳信息技术（深圳）有限公司 | Photodiode detection circuit, optical module, monitoring system and monitoring method thereof |
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| CN113949449A (en) * | 2021-09-24 | 2022-01-18 | 昂纳信息技术（深圳）有限公司 | Photodiode detection circuit, optical module, monitoring system and monitoring method thereof |
| CN113949449B (en) * | 2021-09-24 | 2023-11-17 | 昂纳科技(深圳)集团股份有限公司 | Photodiode detection circuit, optical module, monitoring system and monitoring method thereof |
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