CN208424206U - A kind of constant current source drive device - Google Patents
A kind of constant current source drive device Download PDFInfo
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- CN208424206U CN208424206U CN201821164772.9U CN201821164772U CN208424206U CN 208424206 U CN208424206 U CN 208424206U CN 201821164772 U CN201821164772 U CN 201821164772U CN 208424206 U CN208424206 U CN 208424206U
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- constant current
- current source
- amplifier
- effect tube
- field
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- 230000005669 field effect Effects 0.000 claims abstract description 29
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Abstract
The utility model provides a kind of constant current source drive device, including a constant current source driving circuit, and the constant current source driving circuit includes field-effect tube, amplifier, pressure stabilizing a reference source, the first current-limiting resistance, the first setting resistance and the second setting resistance；The source electrode of the field-effect tube connects positive pole through first current-limiting resistance, and the drain electrode of the field-effect tube is through the input terminal of the first setting resistance connection load, the output end ground connection of the load；The cathode output end of the amplifier connects the input terminal of the load through the second setting resistance, and the input terminal of the cathode output end of the amplifier and the amplifier is all connected with the output end of the pressure stabilizing a reference source；The input terminal of the pressure stabilizing a reference source is separately connected grid and the drain electrode of the field-effect tube.The constant current source driving circuit of the utility model is carried out following feedback using amplifier, improves the precision of constant current source drive device by using amplifier and field-effect tube with good temperature characteristics.
Description
Technical field
The utility model belongs to electronic technology field more particularly to a kind of constant current source drive device.
Background technique
Existing resistance type sensor high current constant-current drive circuit device mostly uses voltage-dropping type reference voltage-stabilizing circuit and adjusts
Whole triode is constituted, in practice since there are certain operating currents or cathode current (to be referred to as pressure stabilizing a reference source for pressure stabilizing a reference source
Electric current), leading to the practical electric current loaded by resistance type sensor includes pressure stabilizing benchmark ource electric current, and pressure stabilizing a reference source is 500
Microampere is differed to 2 milliamperes, and size be can not ignore, and pressure stabilizing benchmark ource electric current changes with temperature change, and therefore, constant current is driven
The constant current accuracy of dynamic circuit device receives fluctuation in actual use, influences precision.
Utility model content
The utility model provides a kind of constant current source drive device, including a constant current source driving circuit, good warm using having
The amplifier and field-effect tube for spending characteristic, are carried out following feedback using amplifier, improve the precision of constant current source drive device.
In order to solve the above technical problems, the utility model provides a kind of constant current source drive device, including constant-current source driving
Circuit, the constant current source driving circuit include field-effect tube, amplifier, pressure stabilizing a reference source, the first current-limiting resistance, the first setting electricity
Resistance and the second setting resistance；
Anode of the source electrode of the field-effect tube through first current-limiting resistance connection power supply, the drain electrode of the field-effect tube
Input terminal through the first setting resistance connection load, the output end ground connection of the load；
The cathode output end of the amplifier connects the input terminal of the load, the amplification through the second setting resistance
The input terminal of the cathode output end of device and the amplifier is all connected with the output end of the pressure stabilizing a reference source；
The input terminal of the pressure stabilizing a reference source is separately connected grid and the drain electrode of the field-effect tube.
An embodiment according to the present utility model, the constant current source driving circuit further includes the second current-limiting resistance, described
The input terminal of pressure stabilizing a reference source connects the anode of the power supply through the second current-limiting resistance.
Another embodiment according to the present utility model, the constant current source driving circuit further includes a protection capacitor, described
One end of protection capacitor connects the anode of the power supply, other end ground connection.
Another embodiment according to the present utility model, the field-effect tube are p-type field-effect tube.
Another embodiment according to the present utility model, the load are resistance type sensor.
The utility model has the beneficial effects that
The constant current source drive device of the utility model, including a constant current source driving circuit, the constant current source driving circuit packet
Include field-effect tube, amplifier, pressure stabilizing a reference source, the first current-limiting resistance, the first setting resistance and the second setting resistance, amplifier
There are good temperature characteristics with field-effect tube, carry out following feedback using amplifier, improve the precision of constant current source drive device.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the utility model embodiment, the utility model embodiment will be retouched below
Attached drawing needed in stating is briefly described, it should be apparent that, the accompanying drawings in the following description is only the utility model
Some embodiments for those of ordinary skill in the art without any creative labor, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of constant current source driving circuit schematic diagram of constant current source drive device provided by the embodiment of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
It clearly and completely describes, it is clear that the embodiments are a part of the embodiments of the present invention, rather than whole implementation
Example.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, fall within the protection scope of the utility model.
As shown in Figure 1, the utility model embodiment provides a kind of constant current source drive device, including a constant current source driving circuit
10, the constant current source driving circuit includes field-effect tube Q1, amplifier U2, pressure stabilizing a reference source U1, the first current-limiting resistance R2, first
Set the setting of resistance R1 and second resistance R3；
Anode of the source electrode of the field-effect tube Q1 through the first current-limiting resistance R2 connection power Vcc, the field-effect
Input terminal of the drain electrode of pipe Q1 through the first setting resistance R1 connection load Rx, the output end ground connection of the load Rx；
The cathode output end of the amplifier U2 connects the input terminal of the load Rx, institute through the second setting resistance R3
The input terminal of the cathode output end and the amplifier U2 of stating amplifier U2 is all connected with the output end of the pressure stabilizing a reference source U1；
The input terminal of the pressure stabilizing a reference source U1 is separately connected grid and the drain electrode of the field-effect Q1 pipe.
Optionally, the constant current source driving circuit 10 further includes the second current-limiting resistance R4, and the pressure stabilizing a reference source U1's is defeated
Enter the anode that end connects the power Vcc through the second current-limiting resistance R4.
Optionally, the constant current source driving circuit 10 further includes a protection capacitor C1, and one end of the protection capacitor C1 connects
Connect the anode of the power Vcc, other end ground connection.
Optionally, the field-effect tube Q1 is p-type field-effect tube.
Optionally, the load Rx is resistance type sensor.
The constant current source drive device of the utility model, including a constant current source driving circuit, the constant current source driving circuit packet
Include field-effect tube, amplifier, pressure stabilizing a reference source, the first current-limiting resistance, the first setting resistance and the second setting resistance, structure letter
It is single；Adjustment triode is replaced with into field-effect tube, the electric current for reducing base stage influences, and the power consumption of integrated circuit is reduced, by electric current
Control is changed into voltage control；The impedance mapped structure that resistance is constituted is set using by amplifier, pressure stabilizing a reference source and second,
And circuit, the direct feedback of instead preceding cathode, by cathode current or work are followed using the amplifier of high-precision low-drift composition
Make electric current by being eliminated, further increases the precision of constant current driving device；Since the impedance of amplifier is far longer than load
Therefore, the shunting of generation can be ignored resistance；Amplifier and field-effect tube have good temperature characteristics, in temperature change
Its performance parameter variations is little, is not affected by temperature the precision for further increasing constant current driving device.
The embodiments of the present invention are described above in conjunction with attached drawing, but the utility model is not limited to
The specific embodiment stated, the above mentioned embodiment is only schematical, rather than restrictive, this field it is common
Technical staff is not departing from the utility model aims and scope of the claimed protection situation under the enlightenment of the utility model
Under, many forms can be also made, are belonged within the protection of the utility model.
Claims (5)
1. a kind of constant current source drive device, which is characterized in that including a constant current source driving circuit, the constant current source driving circuit packet
Include field-effect tube, amplifier, pressure stabilizing a reference source, the first current-limiting resistance, the first setting resistance and the second setting resistance；
Anode of the source electrode of the field-effect tube through first current-limiting resistance connection power supply, the drain electrode of the field-effect tube is through institute
State the input terminal of the first setting resistance connection load, the output end ground connection of the load；
The cathode output end of the amplifier connects the input terminal of the load through the second setting resistance, the amplifier
The input terminal of cathode output end and the amplifier is all connected with the output end of the pressure stabilizing a reference source；
The input terminal of the pressure stabilizing a reference source is separately connected grid and the drain electrode of the field-effect tube.
2. a kind of constant current source drive device according to claim 1, which is characterized in that the constant current source driving circuit also wraps
The second current-limiting resistance is included, the input terminal of the pressure stabilizing a reference source connects the anode of the power supply through the second current-limiting resistance.
3. a kind of constant current source drive device according to claim 2, which is characterized in that the constant current source driving circuit also wraps
A protection capacitor is included, one end of the protection capacitor connects the anode of the power supply, other end ground connection.
4. a kind of constant current source drive device according to claim 1 to 3, which is characterized in that the field-effect tube is P
Type field-effect tube.
5. a kind of constant current source drive device according to claim 1 to 3, which is characterized in that the load is resistor-type
Sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821164772.9U CN208424206U (en) | 2018-07-23 | 2018-07-23 | A kind of constant current source drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821164772.9U CN208424206U (en) | 2018-07-23 | 2018-07-23 | A kind of constant current source drive device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208424206U true CN208424206U (en) | 2019-01-22 |
Family
ID=65124577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821164772.9U Active CN208424206U (en) | 2018-07-23 | 2018-07-23 | A kind of constant current source drive device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208424206U (en) |
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2018
- 2018-07-23 CN CN201821164772.9U patent/CN208424206U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Constant current source device Effective date of registration: 20200423 Granted publication date: 20190122 Pledgee: Anxin Agricultural Insurance Co., Ltd. Shanghai Minhang Branch Co. Pledgor: SHANGHAI ZUOANXINHUI ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2020310000013 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20210531 Granted publication date: 20190122 Pledgee: Anxin Agricultural Insurance Co., Ltd. Shanghai Minhang Branch Co. Pledgor: SHANGHAI ZUOANXINHUI ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2020310000013 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A constant current source driving device Effective date of registration: 20220721 Granted publication date: 20190122 Pledgee: The Bank of Shanghai branch Caohejing Limited by Share Ltd. Pledgor: SHANGHAI ZUOANXINHUI ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2022310000136 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230727 Granted publication date: 20190122 Pledgee: The Bank of Shanghai branch Caohejing Limited by Share Ltd. Pledgor: SHANGHAI ZUOANXINHUI ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2022310000136 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A constant current source driving device Effective date of registration: 20230804 Granted publication date: 20190122 Pledgee: The Bank of Shanghai branch Caohejing Limited by Share Ltd. Pledgor: SHANGHAI ZUOANXINHUI ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2023310000437 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Granted publication date: 20190122 Pledgee: The Bank of Shanghai branch Caohejing Limited by Share Ltd. Pledgor: SHANGHAI ZUOANXINHUI ELECTRONIC TECHNOLOGY Co.,Ltd. Registration number: Y2023310000437 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |