CN102967749A - Current sampler with amplifying circuit - Google Patents
Current sampler with amplifying circuit Download PDFInfo
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- CN102967749A CN102967749A CN201210459753XA CN201210459753A CN102967749A CN 102967749 A CN102967749 A CN 102967749A CN 201210459753X A CN201210459753X A CN 201210459753XA CN 201210459753 A CN201210459753 A CN 201210459753A CN 102967749 A CN102967749 A CN 102967749A
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- optocoupler
- diode
- amplifying circuit
- resistance
- triode
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Abstract
The invention discloses a current sampler with an amplifying circuit. The current sampler comprises a diode, one resistor, an optocoupler and another resistor, wherein the diode and an LED (light emitting diode) lamp are connected with two ends of an alternating current power supply in series, the resistor is connected with the diode in parallel, an input end of the optocoupler is connected onto the resistor in parallel, the output ends of the resistor and the optocoupler are connected onto a direct-current power supply in series, the amplifying circuit is electrically connected onto a U2 node of an output end of the optocoupler, and an optocoupler acquisition signal is transmitted to a control center through a wireless module after being amplified by the amplifying circuit. A current signal of the resistor is amplified by the optocoupler, the resister is connected onto the diode in parallel, and the diode is periodically changed between the turn-on and the turn-off along with the periodical change of an alternating current power supply, so that an output end of the optocoupler can form the periodic high-low level conversion, a digital signal can be formed, and the digital signal can be conveniently processed by a follow-up processor. The optocoupler with lower cost is adopted, so that the current sampler is lower in cost and higher in stability. Therefore, the aims of low manufacture cost and high stability can be realized.
Description
Technical field
The present invention relates to the current sample field, particularly, relate to a kind of current sampler with amplifying circuit.
Background technology
The energy-conservation light fixtures such as electricity-saving lamp, LED lamp are brought into use in China's existing residential quarter illumination, road lighting.The power factor of these light fixtures is close to 1, and rated current is less, meets the theory of present energy-conserving and environment-protective and is widely used, and the management of lighting also is tending towards intelligent day, and particularly single lamp illumination management system is brought into use in a lot of places.Existing Intelligent Plan substantially all is to come collection signal by traditional sensors such as small electric current sensor, hall devices, perhaps gathers the power of electrical appliance with power chip, judges according to power.But use small electric current sensor, Hall element and power chip, they have some following shortcomings: present energy-saving lamp all is direct 220V AC-powered such as (LED light fixture, energy-saving lamp etc.), but some current sensor can only be surveyed DC current, and these sensors all will be aided with necessary peripheral circuit when recording.Cause present circuit sampling circuit volume larger, cost of manufacture is high, poor stability.
Summary of the invention
The object of the invention is to, for the problems referred to above, propose a kind of current sampler with amplifying circuit, with the advantage that realizes that cost of manufacture is low, stability is high.
For achieving the above object, the technical solution used in the present invention is:
A kind of current sampler with amplifying circuit comprises diode
, resistance
, optocoupler and resistance
, described diode
Be connected on the two poles of the earth of AC power, described resistance with the LED lamp
With diode
Be connected in parallel, the input end of described optocoupler is connected in parallel on resistance
On, described resistance
Be connected on the direct supply with the output terminal of optocoupler, be electrically connected amplifying circuit on the U2 node of described optocoupler output terminal, the optocoupler collection signal is transferred to control center through the amplifying circuit amplification by wireless module.
Described amplifying circuit: comprise triode T1 and triode T2, series capacitance C1 between the base stage of described triode T1 and input end, parallel resistance R4 and capacitor C 3 between the emitter of described triode T1 and the ground, series capacitance C2 between the base stage of the collector of described triode T1 and triode T2, series capacitance C4 between the emitter of described triode T2 and output terminal, resistance in series R6 between the emitter of triode T2 and ground.
Technical scheme of the present invention, by optocoupler to resistance
Current signal amplify resistance
Be connected in parallel on diode
On, along with the change in AC power cycle, so that diode
Periodically change between conducting and cut-off, thereby form periodic high-low level conversion at the output terminal of optocoupler, thereby form digital signal, the processor of being convenient to the later stage is processed.Its cost compare is cheap, stability is higher because the low optocoupler of employing cost compare adopts.From but realized that cost of manufacture is low, the high purpose of stability.And the undesired signal of sample circuit can be removed by rc-coupled amplification circuit, avoid interference signal to the interference of the signal of sampling.Obtain better stability.
Description of drawings
Fig. 1 is the described electrical circuit diagram with current sampler external circuitry of amplifying circuit of the embodiment of the invention;
Fig. 2 is the described electrical circuit diagram with current sampler of amplifying circuit of the embodiment of the invention;
The described electrical circuit diagram with current sampler amplifying circuit of amplifying circuit of Fig. 3 embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
As shown in Figure 2, a kind of current sampler with amplifying circuit comprises diode
, resistance
, optocoupler and resistance
, diode
Be connected on the two poles of the earth of AC power, resistance with the LED lamp
With diode
Be connected in parallel, the input end of optocoupler is connected in parallel on resistance
On, resistance
Be connected on the direct supply with the output terminal of optocoupler.Be electrically connected amplifying circuit on the U2 node of optocoupler output terminal, the optocoupler collection signal is transferred to control center through the amplifying circuit amplification by wireless module.AC power is the AC power of 220V.Amplifying circuit is as shown in Figure 3: comprise triode T1 and triode T2, series capacitance C1 between the base stage of described triode T1 and input end, parallel resistance R4 and capacitor C 3 between the emitter of described triode T1 and the ground, series capacitance C2 between the base stage of the collector of described triode T1 and triode T2, series capacitance C4 between the emitter of described triode T2 and output terminal, resistance in series R6 between the emitter of triode T2 and ground.
The current sampler that will have amplifying circuit is connected on the lighting circuit according to circuit shown in Figure 1, and its principle of work is as follows:
Diode
Forward ended in the time of the cycle, and conducting in the time of reversal periods shields to the light lotus root so that electric current is passed by from diode; R2 is a little resistance resistance, so that input impedance is very little, is to reduce also to provide stable voltage for the light lotus root conducting of rear end to the impact of electric light; The light lotus root with front-end collection to signal amplify, by R1, can obtain at the U2 place high level or low level.
Forward is during the cycle, and electric current flows to A2 from A1, diode Q1 cut-off, and the voltage turn-on light lotus root on this moment resistance R 2, the work of light lotus root is in U2 place output low level.During reversal periods, diode Q1 conducting, the resistance optocoupler is not worked, at U2 place output high level.
The U2 place directly is connected to the IO mouth of MCU, when electricity-saving lamp works, at the U2 place out be the fixing square wave of one-period, if lamp fault then waveform can not occur.Processing by MCU then can obtain the whether fault of electric light, and information is passed to control center.
Technical scheme of the present invention has following characteristics:
Work by optocoupler with the fine or not Informational Expression of electric light is out saved the use of general circuit AD, and method is simpler.
Light requirement coupling and simple peripheral circuit just can be realized basic function, and device is very conventional, and cost is very low.
The circuit that external environment or other factors cause damages, and only needs multimeter that device is simply measured and just can know spot failure and easily replacement.
It should be noted that at last: the above only is the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment the present invention is had been described in detail, for a person skilled in the art, it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. the current sampler with amplifying circuit is characterized in that, comprises diode
, resistance
, optocoupler and resistance
, described diode
Be connected on the two poles of the earth of AC power, described resistance with the LED lamp
With diode
Be connected in parallel, the input end of described optocoupler is connected in parallel on resistance
On, described resistance
Be connected on the direct supply with the output terminal of optocoupler, be electrically connected amplifying circuit on the U2 node of described optocoupler output terminal, the optocoupler collection signal is transferred to control center through the amplifying circuit amplification by wireless module,
Described amplifying circuit: comprise triode T1 and triode T2, series capacitance C1 between the base stage of described triode T1 and input end, parallel resistance R4 and capacitor C 3 between the emitter of described triode T1 and the ground, series capacitance C2 between the base stage of the collector of described triode T1 and triode T2, series capacitance C4 between the emitter of described triode T2 and output terminal, resistance in series R6 between the emitter of triode T2 and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210459753XA CN102967749A (en) | 2012-11-15 | 2012-11-15 | Current sampler with amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210459753XA CN102967749A (en) | 2012-11-15 | 2012-11-15 | Current sampler with amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102967749A true CN102967749A (en) | 2013-03-13 |
Family
ID=47798031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210459753XA Pending CN102967749A (en) | 2012-11-15 | 2012-11-15 | Current sampler with amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102967749A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869149A (en) * | 2014-03-20 | 2014-06-18 | 南京理工大学 | Alternating small current high-accuracy detection module |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2618061A1 (en) * | 1976-04-24 | 1977-11-10 | Kernforschung Gmbh Ges Fuer | Automatic measurement of variable parameter RMS value - uses transducer circuit to drive infrared coupling link and output averaging circuit |
| CN101226211A (en) * | 2008-01-19 | 2008-07-23 | 苏州市苏电科技研究所 | Current sensor |
| CN201449411U (en) * | 2009-07-02 | 2010-05-05 | 苏州经贸职业技术学院 | Multichannel current sampling circuit |
| CN201590934U (en) * | 2009-12-25 | 2010-09-22 | 深圳和而泰智能控制股份有限公司 | Ultraviolet lamp failure detection circuit and device |
-
2012
- 2012-11-15 CN CN201210459753XA patent/CN102967749A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2618061A1 (en) * | 1976-04-24 | 1977-11-10 | Kernforschung Gmbh Ges Fuer | Automatic measurement of variable parameter RMS value - uses transducer circuit to drive infrared coupling link and output averaging circuit |
| CN101226211A (en) * | 2008-01-19 | 2008-07-23 | 苏州市苏电科技研究所 | Current sensor |
| CN201449411U (en) * | 2009-07-02 | 2010-05-05 | 苏州经贸职业技术学院 | Multichannel current sampling circuit |
| CN201590934U (en) * | 2009-12-25 | 2010-09-22 | 深圳和而泰智能控制股份有限公司 | Ultraviolet lamp failure detection circuit and device |
Non-Patent Citations (1)
| Title |
|---|
| 苑尚尊 等: "《电工与电子技术》", 31 August 2004, 石油大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103869149A (en) * | 2014-03-20 | 2014-06-18 | 南京理工大学 | Alternating small current high-accuracy detection module |
| CN103869149B (en) * | 2014-03-20 | 2016-09-21 | 南京理工大学 | Exchange small area analysis high precision test module |
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Application publication date: 20130313 |