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Impulse light-regulation circuit and impulse light-regulation method

A pulse dimming and circuit technology, which is applied in the field of pulse dimming circuits and pulse dimming, can solve the problems of inconvenience and high cost

Active Publication Date: 2010-06-16
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current solution often uses two circuit boards, each for a dimming method, but this is costly and inconvenient

Method used

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Embodiment Construction

[0033] Embodiments of a pulse dimming circuit and a pulse dimming method of the present invention will be described in detail below. In the ensuing description, some specific details, such as embodiment circuits and example values ​​for these circuit elements, are used to provide a better understanding of embodiments of the present invention. It will be understood by those skilled in the art that the present invention may be practiced without many of the details or other combinations of methods, elements, materials, etc.

[0034] figure 1 It is a schematic diagram of a pulse dimming circuit according to an embodiment of the present invention. The pulse dimming circuit mainly includes: a first input port, a second input port, a comparison signal generator, a comparator, a logic module and a switch network, wherein the first input port is used for coupling connected to the DC input voltage signal; the second input port is used to couple the PWM input signal when the PWM input ...

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Abstract

The invention discloses an impulse light-regulation circuit and an impulse light-regulation method, wherein the impulse light-regulation circuit comprises a first input port, a second input port, a comparison signal generator, a comparator, a logical module and a switching network, wherein the first input port is used for coupling a DC input voltage signal when the DC input voltage signal is input; the second input port is used for coupling a PWM input signal when the PWM input signal is input; the comparison signal generator is used for generating a comparison signal input into the comparator, distinguishing whether the PWM input signal is input and outputting a logical signal into the logical module; the comparator is used for comparing the DC input voltage signal with the comparison signal and outputting a DC pulse signal into the switching network; the logical module is used for outputting a selecting signal into the switching network according to the logical signal and the PWM input signal; and the switching network is used for outputting the PWM input signal or the DC pulse signal to be taken as an impulse light-regulation signal according to the selecting signal. The invention is simultaneously applicable to two kinds of light-regulation input.

Description

technical field [0001] The invention relates to a dimming circuit and a method thereof for a cold cathode fluorescent lamp, in particular to a pulse dimming circuit and a pulse dimming method. Background technique [0002] The inverter of cathode fluorescent lamp (CCFL) often adopts pulse dimming, and there are usually two pulse dimming methods, that is, pulse dimming using DC input voltage and pulse dimming using external PWM input signal. For the pulse dimming method of DC input, it is necessary to compare the wave generator component, and generate the pulse signal for pulse dimming by comparing the DC input level with the comparative wave; and for the pulse dimming method using PWM input signal That said, the pulse dimming signal directly follows the PWM input signal, so no comparator wave generator components are required. Therefore, the two pulse dimming methods are not compatible with each other. Circuits for pulse dimming with DC input are not suitable for pulse dim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B41/38
CPCH05B41/282Y02B20/183Y02B20/00
Inventor 刘白仁杜磊任远程
Owner CHENGDU MONOLITHIC POWER SYST
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