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Control circuit and method for fixing peak point current of inductor

A technology of peak current and control circuit, applied in the direction of control/regulation system, instrument, regulating electric variable, etc., to achieve the effect of eliminating application problems

Inactive Publication Date: 2008-09-24
ADVANCED ANALOG TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The control circuit and its method for fixed inductor peak current of the present invention are aimed at effectively eliminating the application problems caused by the conventional unfixed inductor peak current

Method used

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  • Control circuit and method for fixing peak point current of inductor
  • Control circuit and method for fixing peak point current of inductor
  • Control circuit and method for fixing peak point current of inductor

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Embodiment Construction

[0013] The purpose of the invention is to keep the inductor peak current constant. Please refer to figure 2 ,because V L = L × dI PK dt , where V L Represents the voltage across the inductor 21, L represents the inductance value, I PK represents the peak current of the inductor, so it can be deduced that I L = V L × T ON L , where T ON represents the turn-on time of the power transistor 22. In other words, in order to keep the inductor peak current constant, it is necessary to make V IN with T ON maintain an inverse relationship.

[0014] image 3 is an embodiment of the control method of the fixed inductor peak c...

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PUM

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Abstract

The invention provides a control circuit of the peak current of a fixed inductor, which comprises operation current, a slope type voltage booster circuit and a comparator. The magnitude of the operation current is in direction proportion to the voltage source of the inductor. The slope type voltage booster circuit is connected with the operation current. One input end of the comparator is as reference voltage, and the other input end is connected with the output of the slope type voltage booster circuit. The output of the comparator is connected with the grid of a power transistor, and the power transistor controls the conducting time of the inductor.

Description

technical field [0001] The invention relates to an inductor current control circuit and a method thereof, in particular to a control circuit and a method for fixing an inductor peak current. Background technique [0002] FIG. 1 is an application schematic diagram of a conventional back-light control IC. Due to the peak current of the inductor 13 I L is the voltage source V connected with the power transistors 14, 15 IN varies, so the peak current I L Not fixed. The unfixed peak current I L It is connected to a cold cathode fluorescent tube (CCFL) 11 through a piezoelectric element (Piezoelectric Crystal; PZT) 12, and as a result, the cold cathode fluorescent tube (CCFL) 11 will be flickering. [0003] Since the peak current of conventional inductors is not fixed, there will be many defects in the application, so there is a need for further improvement. Contents of the invention [0004] The control circuit and method for fixed inductor peak current of the present inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/40
Inventor 简茂全朱竹有孙有民
Owner ADVANCED ANALOG TECH INC