Adaptive constant voltage control circuit and adaptive power conversion controller
A technology of conversion controller and control circuit, applied in control/regulation systems, instruments, regulating electrical variables, etc., can solve the problems of affecting the output voltage regulation characteristics of the constant voltage and constant current conversion controller 10 and increasing the feedback control error value, etc. Accurate load voltage and voltage drop compensation effect
Active Publication Date: 2010-09-29
NIKO SEMICON
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Problems solved by technology
As shown in the figure, in the constant voltage mode, when the output current is close to the current upper limit set by the constant current control, the voltage stabilization characteristics of the constant voltage feedback control will be interfered by the constant current feedback control, causing the load voltage to drop, while Causes the error value of the feedback control to increase, which affects the output voltage stabilization characteristics of the constant voltage and constant current conversion controller 10
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[0062] The spirit of the present invention is to sense the load voltage and load current to generate a voltage sensing signal. By comparing the voltage sensing signal with a current sensing signal corresponding to the load current, it is determined to control according to the current sensing signal or according to the voltage sensing signal, so as to achieve switching between constant current control and constant voltage control functions. In an embodiment of the present invention, a level conversion circuit can also be used to scale and adjust the level of the current sensing signal, so as to achieve the adjustment of the adaptive constant voltage and constant current control point. The adaptive power conversion controller of the present invention will be described in detail below with reference to figures.
[0063] image 3 It is a schematic circuit diagram of a preferred embodiment of the adaptive power conversion controller of the present invention. As shown in the figur...
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The invention provides an adaptive constant voltage control circuit and an adaptive power conversion controller. The adaptive power conversion controller is coupled with a load and a power switching circuit; the adaptive power conversion controller comprises an adaptive voltage sensing unit and a switching control circuit; the adaptive voltage sensing unit is coupled with the load and outputs a voltage sensing signal according to one input current of the power switching circuit, one load voltage from the load or one load current and one load voltage from the load; and the switching control circuit is used for receiving the voltage sensing signal and comparing the voltage sensing signal with a current sensing signal corresponding to the load current so as to determine controlling power supply of the power switching circuit to the load according to the current sensing signal or the voltage sensing signal. In the invention, under the control of constant voltage, the voltage sensing signal is compensated due to increased load current, which can overcome the problem in the prior art that the stabilizing voltage characteristic controlled by constant voltage feedback is disturbed by current feedback control, and provides accurate load voltage.
Description
technical field [0001] The invention relates to a constant voltage control circuit and a power conversion controller, in particular to an adaptive constant voltage control circuit and an adaptive power conversion controller. Background technique [0002] The conversion control of constant voltage and constant current is often used in lithium battery charging modules and current-limiting constant-voltage regulators. As far as the lithium battery charging module is concerned, during the charging process of the lithium battery, the lithium battery charging module first uses a constant current control method to make the lithium battery charge rapidly within the constant current control cycle. Subsequently, when the lithium battery voltage level reaches a default protection value, the lithium battery charging module switches to constant voltage control again, so as to clamp the lithium battery voltage level to achieve the purpose of lithium battery protection. As far as the curr...
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Login to View More IPC IPC(8): G05F1/10G05F1/46
Inventor 丁明强江俊德
Owner NIKO SEMICON