CN208506122U - A kind of bidirectional current sample circuit - Google Patents
A kind of bidirectional current sample circuit Download PDFInfo
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- CN208506122U CN208506122U CN201821212436.7U CN201821212436U CN208506122U CN 208506122 U CN208506122 U CN 208506122U CN 201821212436 U CN201821212436 U CN 201821212436U CN 208506122 U CN208506122 U CN 208506122U
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- difference amplifier
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Abstract
The utility model relates to a kind of bidirectional current sample circuits, including voltage sample resistance, difference amplifier, a reference source for generating bias voltage and the operational amplifier for following circuit, the voltage sample resistance is connected with the difference amplifier, the difference amplifier is connect with a reference source for generating bias voltage, and the output end of the difference amplifier is connect with the operational amplifier of circuit is followed.Beneficial effect is: being sampled by using Milliohm resistance to electric current, generating bias voltage by a reference source and be biased to differential amplifier circuit input terminal allows differential amplifier circuit to acquire bi-directional voltage, reasonable amplification factor is arranged by difference amplifier to amplify collected voltage, obtain the high-accuracy voltage signal for being suitble to single-chip microcontroller processing, it finally follows circuit to handle the output voltage use of amplifier, further increases the quality and driving capability of voltage signal.
Description
Technical field
The utility model relates to current sampling technique field more particularly to a kind of bidirectional current sample circuits.
Background technique
In many circuit systems, we can be related to the sampling of electric current, and prior art common method has: using suddenly
Your sensor carries out current sample, and Hall sensor export the voltage value of suitable single-chip microcontroller sampled voltage range directly to indicate pair
Answer the size of electric current；The precision of this method acquisition is generally poor, the acquisition suitable for high current.Or use single-ended amplification electricity
Road adds the method for sampling resistor, the pressure drop on sampling resistor by single-ended amplifying circuit amplification after input single-chip microcontroller carry out sampling and
Conversion obtains corresponding current value；The circuit precision and stability of this single-ended amplification is poor, and it is less high to be suitable for required precision
Occasion.The utility model improves the quality and driving capability of voltage signal by using bidirectional current sample circuit.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of bidirectional current sample circuit, improves
The quality and driving capability of voltage signal.
The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of bidirectional current sample circuit, including electricity
Pressure sampling resistor, difference amplifier, a reference source for generating bias voltage and the operational amplifier for following circuit, the voltage sample
Resistance is connected with the difference amplifier, and the difference amplifier is connect with a reference source for generating bias voltage, the difference
The output end of amplifier is divided to connect with the operational amplifier of circuit is followed；
The output end of the voltage sample resistance R2 connects the positive input terminal of difference amplifier U2, voltage sample electricity through resistance R3
The output end of resistance R2 connects the negative input end of difference amplifier U2 through resistance R116, the positive input terminal of difference amplifier U2 by R1 with
Bias voltage connection, the output of difference amplifier is by R4, R5 and follows circuit connection, final voltage signal by R10 with
Analog-digital converter connection.
Further, voltage sample resistance R2 uses Milliohm resistance, and the difference amplifier U2 uses OPA365 chip,
The a reference source U1 for generating bias voltage uses REF3312, described to follow circuit computing amplifier U3 using OPA365 operation
Amplifier.
The beneficial effects of the utility model are: being sampled by using Milliohm resistance to electric current, produced by a reference source
Raw bias voltage, which is biased differential amplifier circuit input terminal, allows differential amplifier circuit to acquire bi-directional voltage, passes through difference
Divide amplifier that reasonable amplification factor is arranged to amplify collected voltage, obtains the high precision electro for being suitble to single-chip microcontroller processing
Press signal, finally follow circuit to handle output voltage use of amplifier, further increase the quality of voltage signal with
Driving capability.
Detailed description of the invention
Fig. 1 is bidirectional current sample circuit figure.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, elaborates to the utility model embodiment.
As shown in Figure 1, the utility model provides a kind of high-precision bidirectional current sample circuit, including voltage sample electricity
Resistance, difference amplifier, a reference source for generating bias voltage and the operational amplifier for following circuit, the voltage sample resistance and institute
Difference amplifier connection is stated, the difference amplifier is connect with a reference source for generating bias voltage, the difference amplifier
Output end connect with the operational amplifier of circuit is followed.
The output end of voltage sample resistance R2 meets the positive input terminal of difference amplifier U2, voltage sample resistance R2 through resistance R3
Output end the negative input end of difference amplifier U2 is connect through resistance R116, the positive input terminal of difference amplifier U2 passes through R1 and biasing
The output of voltage connection, difference amplifier by R4, R5 and follows circuit connection, and final voltage signal passes through R10 and modulus
Converter connection.
Preferably, voltage sample resistance R2 uses Milliohm resistance, and the difference amplifier U2 uses OPA365 chip, institute
The a reference source U1 for stating generation bias voltage uses REF3312, described that circuit computing amplifier U3 is followed to put using OPA365 operation
Big device.
Specifically, it is connected by voltage sample resistance with the difference amplifier, the difference amplifier and the generation
The a reference source of bias voltage connects, and the output end of the difference amplifier is connect with the operational amplifier of circuit is followed.Electric current from
On flow through down voltage sample resistance generate voltage Vsen when, voltage sample resistance generate voltage Vsen through generation bias voltage
A reference source, to sampling generate bias voltage a reference source obtain wide voltage range；The input at difference amplifier both ends simultaneously
Voltage is Vref+Vsen (Vref+Vsen < 3.3V), by 15 times of difference channel high-precision amplification；The voltage of the amplification of output makes
With following circuit computing amplifier to connect analog-digital converter output voltage through resistance.The wherein size of voltage are as follows: I=(U/15-
Vref)/R。
Above specific embodiment of the present utility model does not constitute the restriction to scope of protection of the utility model.It is any
According to any other various changes and modifications made by the utility model technical concept, the utility model power should be included in
In the protection scope that benefit requires.
Claims (2)
1. a kind of bidirectional current sample circuit, including voltage sample resistance, difference amplifier, a reference source for generating bias voltage and
The operational amplifier of circuit is followed, the voltage sample resistance is connected with the difference amplifier, the difference amplifier and institute
The a reference source connection for generating bias voltage is stated, the output end of the difference amplifier is connect with the operational amplifier of circuit is followed；
The output end of the voltage sample resistance R2 meets the positive input terminal of difference amplifier U2, voltage sample resistance R2 through resistance R3
Output end the negative input end of difference amplifier U2 is connect through resistance R116, the positive input terminal of difference amplifier U2 passes through R1 and biasing
The output of voltage connection, difference amplifier by R4, R5 and follows circuit connection, and final voltage signal passes through R10 and modulus
Converter connection.
2. a kind of bidirectional current sample circuit according to claim 1, it is characterised in that: the voltage sample resistance R2 is adopted
With Milliohm resistance, the difference amplifier U2 uses OPA365 chip, and a reference source U1 for generating bias voltage is used
REF3312, it is described to follow circuit computing amplifier U3 using OPA365 operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821212436.7U CN208506122U (en) | 2018-07-30 | 2018-07-30 | A kind of bidirectional current sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821212436.7U CN208506122U (en) | 2018-07-30 | 2018-07-30 | A kind of bidirectional current sample circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208506122U true CN208506122U (en) | 2019-02-15 |
Family
ID=65290541
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821212436.7U Active CN208506122U (en) | 2018-07-30 | 2018-07-30 | A kind of bidirectional current sample circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208506122U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900950A (en) * | 2019-04-04 | 2019-06-18 | 上海南芯半导体科技有限公司 | A kind of high-precision continuous time bidirectional current sample circuit and implementation method |
| CN110018336A (en) * | 2019-04-24 | 2019-07-16 | 上海类比半导体技术有限公司 | A kind of bidirectional sample circuit, the method for sampling |
| CN110187158A (en) * | 2019-06-26 | 2019-08-30 | 南京林业大学 | A kind of two-wire system Hall-type RMS current transmitter |
| CN110486893A (en) * | 2019-08-30 | 2019-11-22 | 海信（山东）空调有限公司 | A kind of Defrost method and air conditioner of air conditioner |
-
2018
- 2018-07-30 CN CN201821212436.7U patent/CN208506122U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109900950A (en) * | 2019-04-04 | 2019-06-18 | 上海南芯半导体科技有限公司 | A kind of high-precision continuous time bidirectional current sample circuit and implementation method |
| CN110018336A (en) * | 2019-04-24 | 2019-07-16 | 上海类比半导体技术有限公司 | A kind of bidirectional sample circuit, the method for sampling |
| CN110018336B (en) * | 2019-04-24 | 2021-02-05 | 上海类比半导体技术有限公司 | Bidirectional sampling circuit and sampling method |
| CN110187158A (en) * | 2019-06-26 | 2019-08-30 | 南京林业大学 | A kind of two-wire system Hall-type RMS current transmitter |
| CN110486893A (en) * | 2019-08-30 | 2019-11-22 | 海信（山东）空调有限公司 | A kind of Defrost method and air conditioner of air conditioner |
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