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Dimming control circuit, chip including same, and dimming control method

A dimming control circuit and dimming control technology, which are applied in the control circuit, chip and control field, can solve the problems of dimming depth and insufficient linearity, improve the optical rotation performance, reduce the turn-on delay time, and save the cost of Effect

Active Publication Date: 2022-01-28
SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to solve the problem of insufficient dimming depth and linearity in conventional PWM dimming technology

Method used

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  • Dimming control circuit, chip including same, and dimming control method
  • Dimming control circuit, chip including same, and dimming control method
  • Dimming control circuit, chip including same, and dimming control method

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Embodiment Construction

[0033] Relevant detailed description and technical content of the present invention, now just explain as follows with respect to matching drawing:

[0034] The present invention discloses a dimming control circuit, a chip containing it and a dimming control method, please refer to figure 1 and figure 2 , is a schematic diagram of a dimming control circuit according to the first embodiment of the present invention, the dimming control circuit is applied to a drive circuit 10, the drive circuit 10 includes a drive module 11, a load 12 and a rectification unit 13, the drive module 11 includes a first amplifying unit 111 and a first switching unit 112, the first amplifying unit 111 has a first input terminal 111a, a second input terminal 111b and an output terminal 111c, the first switching unit 112 can be A power switch, such as a Metal Oxide Semiconductor Field-Effect Transistor (MOSFET), but not limited thereto, the power switch can also be one or more triodes. The first swi...

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PUM

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Abstract

A dimming control circuit, a chip including the same, and a dimming control method, the dimming control circuit is applied to a drive circuit, the drive circuit includes a drive module and a load, the drive module includes a first amplification unit and a The switch unit is switched between an on state and an off state according to a pulse width modulation signal, the dimming control circuit includes a time compensation module, and the time compensation module is based on a current sampling value of a current passing through the first switch unit A first time for rising to a target value and a second time for falling from the current sampling value to a closing value generate a delay signal, and the time compensation module delays closing of the switch unit based on the delay signal.

Description

technical field [0001] The invention relates to a control circuit, chip and control method, especially to a control circuit, chip and control method for dimming. Background technique [0002] Among light-emitting diode (Light-emitting diode, LED) dimming control methods, Pulse Width Modulation (Pulse Width Modulation, PWM) is a preferred choice and has become a mainstream technology. The traditional PWM dimming method is to change the pulse width between 0% and 100% to adjust the average current flowing through the LED load to realize the dimming function. [0003] However, as the market and applications gradually increase the requirements for LED dimming, PWM dimming also exposes the problems of dimming depth and insufficient linearity. According to the current technology, in terms of dimming depth, the minimum brightness of PWM dimming is about 5%, so it cannot cover the application range of low brightness; in terms of linearity, when it is in the low brightness range, be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/325H05B45/10
CPCY02B20/40
Inventor 孙顺根
Owner SHANGHAI BRIGHT POWER SEMICONDUCTOR CO LTD
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