CN101515185A - Power MOS tube parallel high-accuracy heavy-current equalizing controller - Google Patents
Power MOS tube parallel high-accuracy heavy-current equalizing controller Download PDFInfo
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- CN101515185A CN101515185A CNA2009101024981A CN200910102498A CN101515185A CN 101515185 A CN101515185 A CN 101515185A CN A2009101024981 A CNA2009101024981 A CN A2009101024981A CN 200910102498 A CN200910102498 A CN 200910102498A CN 101515185 A CN101515185 A CN 101515185A
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Abstract
The invention discloses a power MOS tube parallel high-accuracy heavy-current equalizing controller, belonging to the current controller, aiming at providing a heavy-current constant current controller for precisely controlling the current. The equalizing controller comprises a controller and N parallel current feedback emitter followers, each current feedback emitter follower is connected with a controller; the current feedback emitter follower comprises a operation amplifier and N power MOS tubes; the grid of each power MOS tube is connected with the output end of the operation amplifier by a drive resistance, the drains of all power MOS tubes are in parallel, the source electrode of all power MOS tubes are in parallel by power resistances, the source electrode of each power MOS tube is respectively connected with the negative end of the operation amplifier by a feedback resistance. The invention can avoid the defect of easy damage when the power MOS tubes are in parallel, and is used for the charging and discharging circuit of the large-scale accumulator.
Description
Technical field:
The present invention relates to a kind of current controller, particularly relate to a kind of big electric current constant-current controller.
Background technology:
At present, power MOS pipe has obtained a large amount of utilizations as big electric current tunable load in modern electronic technology; Along with development of technology, though the power of power MOS pipe single tube is increasing, in most of the cases, single power MOS pipe still can't satisfy request for utilization.As when the large-scale accumulator constant-current discharge, need the electronics Constant Current Load of Ampere currents up to ten thousand, power from tens kilowatts to last megawatt (accumulator rated voltage 2V is to 160V), need be with the use in parallel of hundreds of high-power MOS tube.Because the discreteness of power MOS pipe, driving voltage deviation required under same current is bigger, if it is uneven to adopt simple parallel connection then can cause each power MOS pipe electric current in parallel to distribute, thereby can cause that power MOS pipe damages in a large number because of power is uneven under identical driving voltage.
Summary of the invention:
At the above-mentioned defective that exists in the prior art, the present invention aims to provide a kind of power MOS tube parallel high-accuracy heavy-current equalizing controller that can accurately control electric current.
To achieve these goals, the present invention by the following technical solutions: it is made of controller and N current feedback emitter follower in parallel, and each current feedback emitter follower is connected with controller by connection respectively; The current feedback emitter follower comprises an operational amplifier and N power MOS pipe; Wherein, the grid of each power MOS pipe is connected to the output terminal of operational amplifier respectively by a driving resistor, the drain electrode parallel connection of each power MOS pipe, by a power resistor parallel connection, the source electrode of each power MOS pipe is connected on the negative terminal of operational amplifier respectively to the source electrode of each power MOS pipe by a feedback resistance separately.
Controller is the singlechip controller that has current sample and D/A output control.
In above-mentioned technology side, N represents the quantity of current feedback emitter follower, power MOS pipe.
Compared with the prior art, the present invention is owing to adopted technique scheme, utilize the power MOS pipe grouping that performance parameter is approaching of multiple feedback technique in parallel, therefore can accurately control electric current by controller, solve effectively in the conventional art that power MOS pipe is simple to be damaged when in parallel and electric current distributes uneven problem easily.
Description of drawings:
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the structural representation of current feedback emitter follower of the present invention.
Among the figure: controller 1 current feedback emitter follower 2 operational amplifiers 3 feedback resistances 4 driving resistor 5 power MOS pipes 6 power resistors 7
Embodiment:
The invention will be further described below in conjunction with accompanying drawing and specific embodiment:
In Fig. 1～2, N current feedback emitter follower 2 in parallel is connected with controller 1 by connection respectively, and this controller 1 is for having the singlechip controller of current sample and D/A output control.Each current feedback emitter follower 2 comprises an operational amplifier 3 and N power MOS pipe 6; Wherein, the grid of each power MOS pipe 6 is attempted by the output terminal of operational amplifier 3 respectively by a driving resistor 5, the drain electrode parallel connection of each power MOS pipe 6, the source electrode of each power MOS pipe 6 is separately by power resistor 7 parallel connections, be connected to a feedback resistance 4 between the source electrode of each power MOS pipe 6 and corresponding power resistor 7, the other end of each feedback resistance 4 is attempted by the negative terminal of operational amplifier 3.
Principle of work: when the anode of operational amplifier applies voltage, can obtain corresponding load current at the output terminal of current feedback emitter follower, controller 1 acquisition circuit electric current, by programmed control and utilize D/A output that many groups current feedback emitter follower 2 is carried out Current Control, thereby obtain high-precision large current load.The driving voltage of described load current and power MOS pipe is irrelevant, and is only relevant with power resistor 7, and the power resistor that inserts the loop can produce Current Negative Three-Point Capacitance, thereby makes the electric current that flows through each power MOS pipe source electrode be tending towards balanced.
Claims (2)
1. power MOS tube parallel high-accuracy heavy-current equalizing controller, it is characterized in that: be made of controller (1) and N current feedback emitter follower (2) in parallel, each current feedback emitter follower (2) is connected with controller (1) by connection respectively; Current feedback emitter follower (2) comprises an operational amplifier (3) and N power MOS pipe (6); Wherein, the grid of each power MOS pipe (6) is connected to the output terminal of operational amplifier (3) respectively by a driving resistor (5), the drain electrode parallel connection of each power MOS pipe (6), by a power resistor (7) parallel connection, the source electrode of each power MOS pipe (6) is connected on the negative terminal of operational amplifier (3) respectively to the source electrode of each power MOS pipe (6) by a feedback resistance (4) separately.
2. power MOS tube parallel high-accuracy heavy-current equalizing controller according to claim 1 is characterized in that: controller (1) is for having the singlechip controller of current sample and D/A output control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101024981A CN101515185A (en) | 2009-04-01 | 2009-04-01 | Power MOS tube parallel high-accuracy heavy-current equalizing controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009101024981A CN101515185A (en) | 2009-04-01 | 2009-04-01 | Power MOS tube parallel high-accuracy heavy-current equalizing controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101515185A true CN101515185A (en) | 2009-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2009101024981A Pending CN101515185A (en) | 2009-04-01 | 2009-04-01 | Power MOS tube parallel high-accuracy heavy-current equalizing controller |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326675A (en) * | 2013-06-21 | 2013-09-25 | 苏州广帝科微电子有限公司 | Linear radiofrequency power amplifier |
| CN104065373A (en) * | 2014-06-24 | 2014-09-24 | 北京控制工程研究所 | Linear work power MOSFET transistor parallel-connection method |
| CN105591527A (en) * | 2014-10-23 | 2016-05-18 | 北京航天计量测试技术研究所 | Method of improving current equalization performance of power MOSFETs in parallel connection and realization device thereof |
| CN110429681A (en) * | 2019-08-08 | 2019-11-08 | 深圳市驰普科达科技有限公司 | Battery management control system, method, apparatus and electronic product |
| CN112286273A (en) * | 2020-09-28 | 2021-01-29 | 青岛海泰新光科技股份有限公司 | High-performance constant current device and method |
-
2009
- 2009-04-01 CN CNA2009101024981A patent/CN101515185A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326675A (en) * | 2013-06-21 | 2013-09-25 | 苏州广帝科微电子有限公司 | Linear radiofrequency power amplifier |
| CN104065373A (en) * | 2014-06-24 | 2014-09-24 | 北京控制工程研究所 | Linear work power MOSFET transistor parallel-connection method |
| CN104065373B (en) * | 2014-06-24 | 2017-03-15 | 北京控制工程研究所 | A kind of linear work power MOSFET tube parallel method |
| CN105591527A (en) * | 2014-10-23 | 2016-05-18 | 北京航天计量测试技术研究所 | Method of improving current equalization performance of power MOSFETs in parallel connection and realization device thereof |
| CN110429681A (en) * | 2019-08-08 | 2019-11-08 | 深圳市驰普科达科技有限公司 | Battery management control system, method, apparatus and electronic product |
| CN112286273A (en) * | 2020-09-28 | 2021-01-29 | 青岛海泰新光科技股份有限公司 | High-performance constant current device and method |
| CN112286273B (en) * | 2020-09-28 | 2021-11-19 | 青岛海泰新光科技股份有限公司 | High-performance constant current device and method |
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Open date: 20090826 |