Adaptive control device internally and externally set with constant current and method thereof
A self-adaptive control, constant current technology, applied in control/regulating systems, adjusting electrical variables, instruments, etc., can solve problems such as the inability of users to adjust the output current, the large temperature coefficient of the output circuit, and the increased circuit design complexity, etc. Save system cost, simplify application, overcome the effect of insufficient current accuracy
Inactive Publication Date: 2010-01-20
SHANGHAI AWINIC TECH CO LTD
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Problems solved by technology
This undoubtedly increases the complexity of circuit design and testing.
Moreover, due to the limitation of integrated circuit technology, the temperature coefficient of the output circuit is relatively large compared with the way of external discrete resistors.
At the same time, since this resistor is built-in, users cannot easily adjust the output current according to their own requirements.
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[0029]The invention combines the two constant current generation methods in the prior art to produce a technical solution that can not only overcome the problems existing in the two methods, but also give full play to their respective advantages. Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0030] Such as image 3 Shown is a schematic diagram of a constant current adaptive control system. The control system includes: an adaptive control device 2 for internally and externally setting a constant current, a proportional current mirror 23, and an external light-emitting diode D1. The adaptive control device 2 for internally and externally setting a constant current is packaged inside the chip, and outputs a constant current Iref to the input terminal of the proportional current mirror 23, and the proportional current mirror 23 outputs an amplified constant current Iout to the external light-emitting diode ...
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The invention discloses an adaptive control device internally and externally set with constant current which is encapsulated inside a chip, comprising a reference voltage generation unit, an arithmetic amplifier, a constant current generation unit, a selection unit, an internal resistance and an external resistance connecting end; according to voltage of the external resistance connecting end, whether constant current is generated according to the internal resistance or the external resistance. In addition, the invention provides an adaptive control method applying the device to internally and externally set constant current. The invention combines the two constant current generation manners in the prior art, generates a technical scheme which not only can solve the problem of coexistence of the two manners, but also can exert respective advantages of the two manners.
Description
technical field [0001] The invention relates to a device and method for setting a constant current, in particular to an adaptive control device and method for setting a constant current internally and externally. Background technique [0002] In integrated circuits, it is often necessary to output a constant current to the corresponding device, and this constant current requirement is not sensitive to changes in working conditions and external conditions. For example, changes in output current caused by changing power supply voltage, temperature, and process are almost negligible. [0003] Constant current can be produced with constant voltage and constant resistance. Due to the limitation of the manufacturing process level of early integrated circuits, although a constant voltage with negligible changes in power supply voltage and temperature can be obtained, it is difficult to directly obtain a constant resistance resistor inside the chip. The resistance value of discret...
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IPC IPC(8): G05F1/56
Inventor 史亚军孙洪军程剑涛张忠
Owner SHANGHAI AWINIC TECH CO LTD