Constant current source device with adjustable output current
An adjustable output current technology, applied in the field of power supply, can solve the problems of limitation, resource waste application field, high cost, etc., and achieve good economical and practical effects
Pending Publication Date: 2018-04-20
GUIZHOU MINZU UNIV
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Problems solved by technology
[0004] The technical problem solved by the present invention is to provide a constant current source device with adjustable output current to solve the problem that the traditional constant current tube can only provide a single constant current and cannot be adjusted, and multiple constant current tubes need to be installed to provide the load with Repeated construction, high cost, waste of resources and relatively limited application fields caused by constant current under different requirements
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[0014] A constant current source device with adjustable output current, such as figure 1 As shown, it includes a constant current unit, a controllable voltage unit and a power supply, the controllable voltage unit is connected to the constant current unit, and the constant current unit is connected to the power supply and the load.
[0015] The constant current unit is a MOS field effect transistor, such as figure 2 As shown, the MOS field effect transistor includes a gate G, a source S and a drain D, the gate G is connected to the control voltage, the source S is connected to the external power supply, and the drain D outputs the corresponding driving current. The MOS transistor can be enhanced Type MOS field effect tube can also be a consumption type MOS field effect tube. The MOS tube has the advantages of good temperature stability, strong radiation resistance, and low noise, which ensures the stability of the output current and effectively reduces noise interference and ...
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The invention discloses a constant current source device with adjustable output current. The constant current source device comprises a constant current unit, a controllable voltage unit and a power supply, wherein the controllable voltage unit is connected with the constant current unit, the constant current unit is connected with the power supply and a load, and the controllable voltage unit isarranged at the front end of the constant current unit. By changing the input data of a D / A converter or sliding a variable resistor, the purpose of adjusting the control voltage of the constant current unit is achieved, and finally the adjustment of the output current of the constant current unit is achieved. The constant current source device solves the problems of repetitive construction, highcost, waste of resources and limited application areas of the traditional constant current tube as the traditional constant current tube can only provide a single constant current without change and the arrangement of a plurality of constant current tubes are needed to provide constant currents for the load under different requirements, is applicable to many technical areas, and has good economy and practicality.
Description
technical field [0001] The invention relates to the technical field of power supplies, in particular to an adjustable current constant current source device. Background technique [0002] Constant current tube is also called constant current source and steady current source. An ideal constant current tube has the following characteristics: no change due to load changes, no change due to ambient temperature changes, and infinite internal resistance. A constant current source is a power supply that can provide a constant current to the load. The constant current source has a wide range of applications and is essential in many cases. It can provide bias current for various amplifying circuits to stabilize their static operating points. [0003] At present, the traditional constant current tube can only provide a single constant current and cannot be adjusted. In many fields and occasions that need to change the current, it is necessary to set up multiple constant current tubes ...
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IPC IPC(8): G05F1/56
CPCG05F1/561
Inventor 王代强王新锋童红黄金宝付云刘江涛
Owner GUIZHOU MINZU UNIV