CN103513684A - Implementation method for large current constant current source - Google Patents
Implementation method for large current constant current source Download PDFInfo
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- CN103513684A CN103513684A CN201210199759.8A CN201210199759A CN103513684A CN 103513684 A CN103513684 A CN 103513684A CN 201210199759 A CN201210199759 A CN 201210199759A CN 103513684 A CN103513684 A CN 103513684A
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Abstract
The invention relates to an implementation method for a large current constant current source. A control input device (I) inputs a voltage signal which is used for controlling a current of the constant current source, the voltage signal is input through the left end of a third resistor (C), the right end of the third resistor (C) and the left end of a fourth resistor (D) are connected in parallel to a pin (3) of an operational amplifier (E) (namely a positive pole input end), the left end of a first resistor (A) is grounded, and the right end of the first resistor (A) and the left end of a second resistor (B) are connected in parallel to a pin (2) of the operational amplifier (E) (namely a negative input end). The output end (6) of the operational amplifier (E) is connected to a grid electrode of an MOSFET (F), a pin (7) of the operational amplifier (E) is connected with a positive power source (+VCC), a pin (4) of the operational amplifier (E) is connected with a negative power source (-VCC), a drain electrode of the MOSFET (F) is connected with the positive power source (+VCC), a source electrode of the MOSFET (F) is connected with the left end of a sampling resistor (G ) and the right end of the second resistor (B), the right end of the sampling resistor (G ) is connected with the right end of the fourth resistor (D) and meanwhile connected with the upper end of a load resistor (H), the lower end of the load resistor (H) is connected to the power source ground, and the output characteristic of the circuit current is that the output current is equal to the value obtained by dividing the input voltage by the resistance of the sampling resistor.
Description
Technical field
The present invention relates to a kind of high constant-current source implementation method, belong to battery management field.
Background technology
Current, along with the increase of battery capacity, require to provide the constant current source that discharges and recharges of larger electric current, design is in the past to obtain the voltage corresponding with electric current by sampling shunt, then use comparer, compare with reference voltage, integration, thereby obtain a pulsation constant current source, this constant current source pulsatile change is large, when frequency is within the scope of sound wave, device produces noise, and integrated circuit work is stable not, therefore need a kind of new method, solve the problem of high constant-current source.
Summary of the invention
The present invention relates to a kind of high constant-current source implementation method, to realize large current stabilization precision constant current source.
For realizing above-mentioned object, the present invention adopts following technical scheme:
A kind of high constant-current source implementation method comprises: amplifier (E), MOSFET pipe (F), resistance one (A), resistance two (B), resistance three (C), resistance four (D), sampling resistor (G), pull-up resistor (H), control inputs (I), positive supply (+VCC), negative supply (VCC), as shown in Figure 1;
Below in conjunction with accompanying drawing, technical pattern of the present invention and method are described:
The voltage signal that the size of current of control inputs (I) input constant current source is controlled, left end input by resistance three (C), resistance three (C) right-hand member and resistance four (D) left end are connected in parallel in 3 pin of amplifier (E), it is electrode input end, the left end ground connection of resistance one (A), the left end of the right-hand member of resistance one (A) and resistance two (B) is connected in parallel in 2 pin of amplifier (E), it is negative input, amplifier (E) output terminal 6 is connected to MOSFET pipe (F) grid, 7 pin of amplifier (E) connect positive supply (+VCC), 4 pin of amplifier (E) connect negative supply (VCC), the drain electrode of MOSFET pipe (F) connects positive supply (+VCC), MOSFET pipe (F) source electrode connects the left end of sampling resistor (G) and the right-hand member of resistance two (B), the right-hand member of sampling resistor (G) is connected with the right-hand member of resistance four (D), be connected with pull-up resistor (H) upper end simultaneously, pull-up resistor (H) lower end is connected to power supply ground.
The input voltage of control inputs (I) is U0, sampling resistor (G) voltage is below U3, resistance one (A), resistance two (B), resistance three (C), resistance four (D) is four identical resistance of resistance, because resistance three (C), resistance four (D) resistance equates, thereby according to voltage division formulas, resistance three (C) left end voltage U 1=(U0+U3)/2, resistance one (A), resistance two (B) resistance equates, form 2 times of amplifying circuits of forward, 6 pin outputs of amplifier (E) connect MOSFET pipe (F), essence is voltage follower, its output voltage U 2, be the output voltage of amplifier (E), its value is U2=2U1=2* (U0+U3)/2, after simplification, obtain U2=U0+U3, and the pressure drop of sampling resistor (G) is: U2-U3=(U0+U3)-U3, the voltage obtaining after simplification on sampling resistor (G) is U0, at this moment in circuit, electric current output is the resistance of U0/ sampling resistor (G), if U0 value is fixing, current constant in circuit, it is circuital current output characteristic: output current=input voltage/sampling resistor resistance, and output is expanded stream through MOSFET pipe (F), thereby realization can be exported the constant current source of large electric current.
Beneficial effect of the present invention:
Control simple, out-put supply is large, electric current stable output, precision advantages of higher.
accompanying drawing explanation:
Accompanying drawing 1 is principle of work schematic diagram of the present invention.
embodiment:
In order to make technical scheme of the present invention clearer, below in conjunction with drawings and Examples, the present invention is described in more detail, and instantiation described herein only, in order to explain the present invention, is not limited to the present invention.
embodiment:
Refer to shown in accompanying drawing 1, the voltage signal that the size of current of control inputs (I) input constant current source is controlled, left end input by resistance three (C), resistance three (C) right-hand member and resistance four (D) left end are connected in parallel in 3 pin of amplifier (E), it is electrode input end, the left end ground connection of resistance one (A), the left end of the right-hand member of resistance one (A) and resistance two (B) is connected in parallel in 2 pin of amplifier (E), it is negative input, amplifier (E) output terminal 6 is connected to MOSFET pipe (F) grid, 7 pin of amplifier (E) connect positive supply (+VCC), 4 pin of amplifier (E) connect negative supply (VCC), the drain electrode of MOSFET pipe (F) connects positive supply (+VCC), MOSFET pipe (F) source electrode connects the left end of sampling resistor (G) and the right-hand member of resistance two (B), the right-hand member of sampling resistor (G) is connected with the right-hand member of resistance four (D), be connected with pull-up resistor (H) upper end simultaneously, pull-up resistor (H) lower end is connected to power supply ground,
The input voltage of control inputs (I) is U0, sampling resistor (G) voltage is below U3, resistance one (A), resistance two (B), resistance three (C), resistance four (D) is four identical resistance of resistance, because resistance three (C), resistance four (D) resistance equates, thereby according to voltage division formulas, resistance three (C) left end voltage U 1=(U0+U3)/2, resistance one (A), resistance two (B) value equates, form 2 times of amplifying circuits of forward, 6 pin outputs of amplifier (E) connect MOSFET pipe (F), essence is voltage follower, its output voltage U 2, be the output voltage of amplifier (E), its value is U2=2U1=2* (U0+U3)/2, after simplification, obtain U2=U0+U3, and the pressure drop of sampling resistor (G) is: U2-U3=(U0+U3)-U3, the voltage obtaining after simplification on sampling resistor (G) is U0, at this moment in circuit, electric current output is the resistance of U0/ sampling resistor (G), if U0 value is fixing, current constant in circuit, it is circuital current output characteristic: output current=input voltage/sampling resistor resistance, and output is expanded stream through MOSFET pipe (F), thereby the constant current source of the large electric current of realization output.
In this example, resistance one (A), resistance two (B), resistance three (C), resistance four (D) are got 1000 Europe, sampling resistor (G) Qu0.1 Europe, pull-up resistor (H) Wei0.1 Europe, if input voltage U0 is 2V, in circuit, electric current is I=U0/Rg=2/0.1=20A, and electric current maintains 20A all the time.
Claims (1)
1. a high constant-current source implementation method, comprise: amplifier (E), MOSFET manages (F), resistance one (A), resistance two (B), resistance three (C), resistance four (D), sampling resistor (G), pull-up resistor (H), control inputs (I), positive supply (+VCC), negative supply (VCC), it is characterized in that: the voltage signal that the size of current of control inputs (I) input constant current source is controlled, left end input by resistance three (C), resistance three (C) right-hand member and resistance four (D) left end are connected in parallel in 3 pin of amplifier (E), it is electrode input end, the left end ground connection of resistance one (A), the left end of the right-hand member of resistance one (A) and resistance two (B) is connected in parallel in 2 pin of amplifier (E), it is negative input, amplifier (E) output terminal 6 is connected to MOSFET pipe (F) grid, 7 pin of amplifier (E) connect positive supply (+VCC), 4 pin of amplifier (E) connect negative supply (VCC), the drain electrode of MOSFET pipe (F) connects positive supply (+VCC), MOSFET pipe (F) source electrode connects the left end of sampling resistor (G) and the right-hand member of resistance two (B), the right-hand member of sampling resistor (G) is connected with the right-hand member of resistance four (D), be connected with pull-up resistor (H) upper end simultaneously, pull-up resistor (H) lower end is connected to power supply ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199759.8A CN103513684A (en) | 2012-06-18 | 2012-06-18 | Implementation method for large current constant current source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210199759.8A CN103513684A (en) | 2012-06-18 | 2012-06-18 | Implementation method for large current constant current source |
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| CN103513684A true CN103513684A (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210199759.8A Pending CN103513684A (en) | 2012-06-18 | 2012-06-18 | Implementation method for large current constant current source |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306490A (en) * | 2017-01-12 | 2018-07-20 | 中兴通讯股份有限公司 | Power supply output control circuit and method |
| EP4072009A3 (en) * | 2021-04-06 | 2022-10-19 | MediaTek Inc. | Symbol-power-tracking supply, and wireless device using amplification system powered by the symbol-power-tracking supply |
-
2012
- 2012-06-18 CN CN201210199759.8A patent/CN103513684A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306490A (en) * | 2017-01-12 | 2018-07-20 | 中兴通讯股份有限公司 | Power supply output control circuit and method |
| EP4072009A3 (en) * | 2021-04-06 | 2022-10-19 | MediaTek Inc. | Symbol-power-tracking supply, and wireless device using amplification system powered by the symbol-power-tracking supply |
| TWI826892B (en) * | 2021-04-06 | 2023-12-21 | 聯發科技股份有限公司 | Symbol-power-tracking supply and wireless device thereof |
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Application publication date: 20140115 |