CN208421050U - A kind of unidirectional current sample circuit - Google Patents
A kind of unidirectional current sample circuit Download PDFInfo
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- CN208421050U CN208421050U CN201821212397.0U CN201821212397U CN208421050U CN 208421050 U CN208421050 U CN 208421050U CN 201821212397 U CN201821212397 U CN 201821212397U CN 208421050 U CN208421050 U CN 208421050U
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Abstract
The utility model relates to a kind of unidirectional current sample circuits, circuit is followed including sampling resistor, differential amplifier circuit, level-one, the sampling resistor acquisition electric current obtains voltage value, the voltage value, which is input to after differential amplifier circuit, amplifies adjustment for voltage value, amplify voltage value adjusted and be input to level-one and circuit is followed to be handled, the electric current successively forms high-precision unidirectional current sample circuit after sampling resistor, differential amplifier circuit, level-one follow circuit；The differential amplifier circuit, further includes input terminal, amplification factor adjustment member, output end, and the input terminal is used to receive voltage in acquisition；The amplification factor adjustment member is used to carry out received voltage control amplification adjustment voltage value；The output end is exported for that will amplify voltage value adjusted.Beneficial effect is: electric current successively forms unidirectional current sample circuit after sampling resistor, differential amplifier circuit, level-one follow circuit, realizes and unidirectionally acquires to the high-precision of current signal.
Description
Technical field
The utility model relates to current sampling technique field more particularly to a kind of unidirectional 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 adds the method for sampling resistor by using differential amplifier circuit, improves amplifying circuit output voltage
Driving capability.
Utility model content
In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a kind of unidirectional current sample circuit, and raising is put
The driving capability of big circuit output voltage.
The technical solution that the utility model solves above-mentioned technical problem is as follows: a kind of unidirectional current sample circuit, including adopts
Sample resistance, differential amplifier circuit, level-one follow circuit, and the sampling resistor acquisition electric current obtains voltage value, and the voltage value is defeated
Voltage value is amplified after entering to differential amplifier circuit and is adjusted, amplifies voltage value adjusted and is input to level-one and follow at circuit
Reason, the electric current successively form unidirectional current sample circuit after sampling resistor, differential amplifier circuit, level-one follow circuit；
The differential amplifier circuit, further includes input terminal, amplification factor adjustment member, output end, and the input terminal is used for
Voltage is received in acquisition；The amplification factor adjustment member is used to carry out received voltage control amplification adjustment voltage value；
The output end is exported for that will amplify voltage value adjusted.
Further, the sampling resistor carries out current acquisition using milliohm grade.
Further, the amplification factor adjustment member amplifies adjustment voltage value to received voltage.
Further, the level-one follows circuit to handle the output voltage of amplifying circuit, improves the driving of voltage
Ability.
The beneficial effects of the utility model are: electric current, which successively passes through sampling resistor, differential amplifier circuit, level-one, follows circuit
Unidirectional current sample circuit is formed afterwards, is realized the unidirectional acquisition to current signal, is improved the precision and stabilization of current sample
Property.
Detailed description of the invention
Fig. 1 is high-precision unidirectional 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 unidirectional current sample circuit, including sampling resistor, difference
Amplifying circuit, level-one is divided to follow circuit, sampling resistor acquires electric current and obtains voltage value, after voltage value is input to differential amplifier circuit
Voltage value is amplified and is adjusted, amplifies voltage value adjusted and is input to level-one circuit is followed to be handled, electric current is successively by adopting
Sample resistance, differential amplifier circuit, level-one form unidirectional current sample circuit after following circuit；Differential amplifier circuit further includes defeated
Enter end, amplification factor adjustment member, output end, input terminal is used to receive voltage in acquisition；Amplification factor adjustment member is used for
Control amplification adjustment voltage value is carried out to received voltage；Output end is exported for that will amplify voltage value adjusted.
Sampling resistor carries out current acquisition using milliohm grade.
Amplification factor adjustment member amplifies adjustment voltage value to received voltage.
Level-one follows circuit to handle the voltage of input, improves the driving capability of amplifying circuit output voltage.
Specifically, electric current successively forms unidirectional current after sampling resistor, differential amplifier circuit, level-one follow circuit and adopts
Sample circuit completes the high precision collecting to current signal.Electric current flows through sampling resistor R114 from top to bottom, produces on sampling resistor
Raw voltage value, input voltage of this voltage value as differential amplifier circuit are adjusted by differential amplifier circuit high-precision amplification
It to preset voltage value, follows circuit to be handled using level-one, further increases the driving capability of this voltage.Wherein, poor
The voltage exported after dividing amplifying circuit to amplify received voltage are as follows:
Vout=Vsen* (R200/R109)
Wherein, Vout is difference channel output voltage, and Vsen is sampling resistor pressure drop.
The size of electric current is obtained by following formula:
I=U/R=Vout/R114
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 (4)
1. a kind of unidirectional current sample circuit, including sampling resistor, differential amplifier circuit, level-one follow circuit, the sampling electricity
Resistance acquisition electric current obtains voltage value, and the voltage value, which is input to after differential amplifier circuit, amplifies adjustment, amplification adjustment for voltage value
Voltage value afterwards is input to level-one and circuit is followed to be handled, and the electric current successively passes through sampling resistor, differential amplifier circuit, one
Grade forms high-precision unidirectional current sample circuit after following circuit；
The differential amplifier circuit further includes input terminal, amplification factor adjustment member, output end, and the input terminal is for adopting
Voltage is received when collection；The amplification factor adjustment member is used to carry out received voltage control amplification adjustment voltage value；It is described
Output end is exported for that will amplify voltage value adjusted.
2. a kind of unidirectional current sample circuit according to claim 1, it is characterised in that: the sampling resistor uses milliohm
Grade carries out current acquisition.
3. a kind of unidirectional current sample circuit according to claim 1, it is characterised in that: the differential amplifier circuit docking
The voltage of receipts amplifies adjustment voltage value.
4. a kind of unidirectional current sample circuit according to claim 1, it is characterised in that: the level-one follows circuit to defeated
The voltage entered is handled, and the driving capability of amplifying circuit output voltage is improved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821212397.0U CN208421050U (en) | 2018-07-30 | 2018-07-30 | A kind of unidirectional current sample circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821212397.0U CN208421050U (en) | 2018-07-30 | 2018-07-30 | A kind of unidirectional current sample circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208421050U true CN208421050U (en) | 2019-01-22 |
Family
ID=65123458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821212397.0U Active CN208421050U (en) | 2018-07-30 | 2018-07-30 | A kind of unidirectional current sample circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208421050U (en) |
-
2018
- 2018-07-30 CN CN201821212397.0U patent/CN208421050U/en active Active
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