CN204241556U - A kind of 220VAC load current detection circuit - Google Patents
A kind of 220VAC load current detection circuit Download PDFInfo
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- CN204241556U CN204241556U CN201420686266.1U CN201420686266U CN204241556U CN 204241556 U CN204241556 U CN 204241556U CN 201420686266 U CN201420686266 U CN 201420686266U CN 204241556 U CN204241556 U CN 204241556U
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Abstract
The utility model discloses a kind of 220VAC load current detection circuit, it relates to loaded work piece current detection technology field.It comprises sample circuit, signal amplification circuit, active rectifying circuit, sampling analog to digital conversion circuit and power circuit, sample circuit connects signal amplification circuit, signal amplification circuit connects active rectifying circuit, active rectifying circuit connects sampling analog to digital conversion circuit, and signal amplification circuit, active rectifying circuit are all connected with power circuit.The utility model reliability is high, and accuracy of detection is high, and degree of stability is high, and volume is little, and drift about low, sampling precision is high.
Description
Technical field
The utility model relates to loaded work piece current detection technology field, be specifically related to a kind of 220VAC load current detection circuit.
Background technology
The 220VAC load current detection circuit of current employing mainly comprises isolation current transformer, isolated voltage transformer, rectification circuit and analog to digital conversion circuit, with reference to Fig. 1, by current transformer T2, the big current signal of load-side is converted to secondary small area analysis signal, and through isolation, export after being amplified by amplifier U6 again, this type of circuit also exists certain design defect: the mutual inductor volume that circuit adopts is large, compact circuit plate cannot use, and mutual inductor magnetic saturation can be caused, export distortion, sampling precision is lower, based on this, design a kind of 220VAC load current detection circuit or necessary.
Summary of the invention
For the deficiency that prior art exists, the utility model object is to provide a kind of 220VAC load current detection circuit, and structure is simple, and reasonable in design, reliability is high, and accuracy of detection is high, and degree of stability is high, and volume is little, and drift about low, sampling precision is high.
To achieve these goals, the utility model realizes by the following technical solutions: a kind of 220VAC load current detection circuit, comprise sample circuit, signal amplification circuit, active rectifying circuit, sampling analog to digital conversion circuit and power circuit, sample circuit connects signal amplification circuit, signal amplification circuit connects active rectifying circuit, active rectifying circuit connects sampling analog to digital conversion circuit, and signal amplification circuit, active rectifying circuit are all connected with power circuit.
As preferably, described sample circuit comprises the first resistance, signal amplification circuit comprises differential amplifier, 2 pin of one termination differential amplifier of the first resistance, 3 pin of another termination differential amplifier of the first resistance, 4 pin of differential amplifier, 5 pin, 7 pin connect the second electric capacity, the 4th resistance, the first electric capacity respectively to holding in analog, and 5 pin of differential amplifier, 8 pin connect the 3rd resistance, the second resistance respectively to 6 pin of differential amplifier; Described active rectifying circuit comprises operational amplifier, 2 pin of operational amplifier connect 6 pin of differential amplifier, 2 pin of operational amplifier connect 1 pin of the first diode to operational amplifier, 1 pin of operational amplifier connects the second diode, the 5th resistance successively to 2 pin of operational amplifier, node between second diode and the 5th resistance connects the 6th resistance to analog to digital conversion circuit of sampling, one termination the 4th electric capacity, the 7th resistance of the 6th resistance are extremely held in analog, and 3 pin of operational amplifier, 8 pin connect the 9th resistance, the 3rd electric capacity respectively to holding in analog.
As preferably, described power circuit comprises isolating switch power, and 6 pin of isolating switch power connect 8 pin of 7 pin of differential amplifier, operational amplifier, and 4 pin of isolating switch power connect 4 pin of differential amplifier.
As preferably, the first described resistance adopts sampling with high precision resistance, and when loaded work piece, electric current, through the first resistance, because the first resistance only has 0.05 ohm/5W, can produce small pressure drop.
The beneficial effects of the utility model: whole circuit floats on 220VAC live wire and works, low-pressure side is sent to by isolating device, eliminate the large volumes such as current transformer, low precision device, make the parameter on testing circuit direct-detection 220VAC live wire, reliability is high, and precision is high, degree of stability is high, drifts about low.
Accompanying drawing explanation
The utility model is described in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is the circuit diagram of prior art;
Fig. 2 is structured flowchart of the present utility model;
Fig. 3 is the circuit diagram of the utility model sample circuit;
Fig. 4 is the circuit diagram of the utility model signal amplification circuit;
Fig. 5 is the circuit diagram of the utility model active rectifying circuit;
Fig. 6 is the circuit diagram of the utility model power circuit.
Embodiment
The technological means realized for making the utility model, creation characteristic, reaching object and effect is easy to understand, below in conjunction with embodiment, setting forth the utility model further.
With reference to Fig. 1-6, this embodiment is by the following technical solutions: a kind of 220VAC load current detection circuit, comprise sample circuit 1, signal amplification circuit 2, active rectifying circuit 3, sampling analog to digital conversion circuit 4 and power circuit 5, sample circuit 1 connects signal amplification circuit 2, signal amplification circuit 2 connects active rectifying circuit 3, active rectifying circuit 3 connects sampling analog to digital conversion circuit 4, and signal amplification circuit 2, active rectifying circuit 3 are all connected with power circuit 5.
It should be noted that, described sample circuit 1 comprises the first resistance R1, signal amplification circuit 2 comprises differential amplifier IC11,2 pin of the one termination differential amplifier IC11 of the first resistance R1,3 pin of another termination differential amplifier IC11 of the first resistance R1,4 pin of differential amplifier IC11,5 pin, 7 pin meet the second electric capacity C2, the 4th resistance R4, the first electric capacity C1 respectively to holding AGND in analog, and 5 pin of differential amplifier IC11,8 pin connect 6 pin of the 3rd resistance R3, the second resistance R2 to differential amplifier IC11 respectively; The first described resistance R1 adopts sampling with high precision resistance, and when loaded work piece, electric current, through the first resistance R1, because the first resistance R1 only has 0.05 ohm/5W, can produce small pressure drop, this pressure drop input difference amplifier.
It should be noted that, described active rectifying circuit 3 comprises operational amplifier IC37A, 2 pin of operational amplifier IC37A connect 6 pin of differential amplifier IC11, 2 pin of operational amplifier IC37A connect 1 pin of the first diode D1 to operational amplifier IC37A, 1 pin of operational amplifier IC37A meets the second diode D2 successively, 2 pin of the 5th resistance R5 to operational amplifier IC37A, node between second diode D2 and the 5th resistance R5 meets the 6th resistance R6 to sampling analog to digital conversion circuit 4, one termination the 4th electric capacity C4 of the 6th resistance R6, 7th resistance R7 is to holding AGND in analog, 3 pin of operational amplifier IC37A, 8 pin meet the 9th resistance R9 respectively, 3rd electric capacity C3 is to holding AGND in analog.
In addition, described power circuit 5 comprises isolating switch power IC5,6 pin of isolating switch power IC5 connect 7 pin of differential amplifier IC11,8 pin of operational amplifier IC37A, 4 pin of isolating switch power IC5 connect 4 pin of differential amplifier IC11, the outgoing side of isolating switch power IC5 floats on 220VAC, and ground wire is in the live wire of 220VAC.
This embodiment electric current produces small voltage differential signal through the first resistance R1, after differential amplifier IC11 amplifies, output to active rectifying circuit 3, obtains current value after rectification by sampling analog to digital conversion circuit 4:
1, when loaded work piece, electric current, through the first resistance R1, because the first resistance R1 only has 0.05 ohm/5W, can produce small pressure drop;
2, the pressure drop that the first resistance R1 produces will carry out differential amplification by differential amplifier IC11;
3, the signal after differential amplifier IC11 amplifies is single-ended signal, outputs to operational amplifier IC37A and carries out rectification;
4, after operational amplifier IC37A rectification, carry out digital-to-analog conversion by the AD of single-chip microcomputer or independent AD, obtain exact numerical;
5, the operating voltage of whole circuit is powered by isolating switch power IC5, and the power ground after isolation and amplifier is directly connected with the live wire of 220VAC, to provide unified reference ground.
This embodiment Direct Sampling 220VAC side signal and data, eliminate the curtage mutual inductor of bulky, through actual verification, and achieve good effect, and be quick on the draw, working stability, drift about minimum, sampling precision is high, has market application foreground widely.
More than show and describe ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and instructions just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (4)
1. a 220VAC load current detection circuit, it is characterized in that, comprise sample circuit (1), signal amplification circuit (2), active rectifying circuit (3), sampling analog to digital conversion circuit (4) and power circuit (5), sample circuit (1) connects signal amplification circuit (2), signal amplification circuit (2) connects active rectifying circuit (3), active rectifying circuit (3) connects sampling analog to digital conversion circuit (4), and signal amplification circuit (2), active rectifying circuit (3) are all connected with power circuit (5).
2. a kind of 220VAC load current detection circuit according to claim 1, it is characterized in that, described sample circuit (1) comprises the first resistance (R1), signal amplification circuit (2) comprises differential amplifier (IC11), 2 pin of one termination differential amplifier (IC11) of the first resistance (R1), 3 pin of another termination differential amplifier (IC11) of the first resistance (R1), 4 pin of differential amplifier (IC11), 5 pin, 7 pin connect the second electric capacity (C2) respectively, 4th resistance (R4), first electric capacity (C1) is to holding (AGND) in analog, 5 pin of differential amplifier (IC11), 8 pin connect the 3rd resistance (R3) respectively, second resistance (R2) is to 6 pin of differential amplifier (IC11).
3. a kind of 220VAC load current detection circuit according to claim 1, it is characterized in that, described active rectifying circuit (3) comprises operational amplifier (IC37A), 2 pin of operational amplifier (IC37A) connect 6 pin of differential amplifier (IC11), 2 pin of operational amplifier (IC37A) connect 1 pin of the first diode (D1) to operational amplifier (IC37A), 1 pin of operational amplifier (IC37A) connects the second diode (D2) successively, 5th resistance (R5) is to 2 pin of operational amplifier (IC37A), node between second diode (D2) and the 5th resistance (R5) connects the 6th resistance (R6) to analog to digital conversion circuit of sampling (4), one termination the 4th electric capacity (C4) of the 6th resistance (R6), 7th resistance (R7) is to holding (AGND) in analog, 3 pin of operational amplifier (IC37A), 8 pin connect the 9th resistance (R9) respectively, 3rd electric capacity (C3) is to holding (AGND) in analog.
4. a kind of 220VAC load current detection circuit according to claim 1, it is characterized in that, described power circuit (5) comprises isolating switch power (IC5), 6 pin of isolating switch power (IC5) connect 7 pin of differential amplifier (IC11), 8 pin of operational amplifier (IC37A), and 4 pin of isolating switch power (IC5) connect 4 pin of differential amplifier (IC11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420686266.1U CN204241556U (en) | 2014-11-17 | 2014-11-17 | A kind of 220VAC load current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420686266.1U CN204241556U (en) | 2014-11-17 | 2014-11-17 | A kind of 220VAC load current detection circuit |
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| Publication Number | Publication Date |
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| CN204241556U true CN204241556U (en) | 2015-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420686266.1U Active CN204241556U (en) | 2014-11-17 | 2014-11-17 | A kind of 220VAC load current detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105259407A (en) * | 2015-11-04 | 2016-01-20 | 武汉精测电子技术股份有限公司 | Device and method for sampling and detection of multiple currents |
-
2014
- 2014-11-17 CN CN201420686266.1U patent/CN204241556U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105259407A (en) * | 2015-11-04 | 2016-01-20 | 武汉精测电子技术股份有限公司 | Device and method for sampling and detection of multiple currents |
| CN105259407B (en) * | 2015-11-04 | 2019-04-30 | 武汉精测电子集团股份有限公司 | It can be to the device and method that Multi-path electricity stream is sampled and is detected |
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