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LED constant current drive chip and device, and LED lamp

A technology for constant current driving chips and LED light strings, applied in lighting devices, light sources, electrical components, etc., can solve the problems of color temperature adjustment and brightness adjustment of LED light strings not being controlled by power switches, and inaccurate detection of power-off times.

Active Publication Date: 2016-11-16
SHENZHEN FM ELECTRONICS GRP CO LTD
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to provide an LED constant current drive chip, a drive device and an LED lamp, aiming to solve the problem of inaccurate detection of power-off times of the power switch by the LED constant current drive chip in the existing LED dimming and color temperature system. The problem that the color temperature adjustment and brightness adjustment of the LED light string is not controlled by the power switch

Method used

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  • LED constant current drive chip and device, and LED lamp
  • LED constant current drive chip and device, and LED lamp
  • LED constant current drive chip and device, and LED lamp

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022]In the embodiment of the present invention, the LED constant current driving module including the first power-off detection module, the second power-off detection module, the cycle counter, the encoding and decoding module, the pulse width modulation module, the first constant current driving module and the second constant current driving module are adopted. The current drive chip is judged by the first power-off detection module when it detects that the on-time of the first switch tube reaches the preset maximum on-time, and the off-time of the first switch tube is less than the preset overvo...

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Abstract

The invention belongs to the field of LED drive control, and provides an LED constant current drive chip and device, and an LED lamp. The drive chip comprises a power-off detection module, a circulating counter, a coding and decoding module, a pulse width modulation module, a first constant current drive module, and a second constant current drive module. When the power-off detection module detects that the conduction time of a switching tube reaches preset maximum conduction time and the switching-off time of the switching tube is less than preset overvoltage protection switching-off time, a power switch is judged to be switched off and the circulating counter is controlled to carry out shifting. The coding and decoding module controls a corresponding LED lamp string to emit light according to the shifting result when the power switch is switched on again, so as to achieve the color temperature adjustment. The pulse width modulation module drives the corresponding LED lamp string to emit light through a preset current, so as to adjust the brightness, thereby enabling the drive chip to accurately carry out the color temperature adjustment and brightness adjustment of the LED lamp string under the control of the power switch.

Description

technical field [0001] The invention belongs to the technical field of LED drive control, and in particular relates to an LED constant current drive chip, a device and an LED lamp. Background technique [0002] The existing LED dimming and color temperature system adjusts the color temperature and brightness of the LED light string by detecting the power-off times of the power switch through the LED constant current drive chip. Such as figure 1 As shown, when the power switch is powered off, the voltage of the bus capacitor CL behind the rectifier bridge will drop, causing the voltage of the power supply pin of the LED constant current driver chip to drop, and the LED constant current chip will be detected by the low voltage detection module in the LED constant current chip. When the voltage of the power pin of the LED constant current driver chip is detected to be lower than the preset voltage value, the low-voltage detection module judges that the power switch is powered ...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00H05B45/325H05B45/34
CPCH05B45/00H05B45/50H05B45/10
Inventor 胡渊
Owner SHENZHEN FM ELECTRONICS GRP CO LTD
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