Constant power linear constant current led drive control method and circuit structure

A linear constant current and constant power technology, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve the problems of stroboscopic, difficult to constant power output, hinder the promotion of LED linear constant current drive, etc., and achieve high efficiency , the effect of constant power

Active Publication Date: 2019-09-17
GUIZHOU E CHIP MICROELECTRONICS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the architecture generally adopted by the existing LED linear constant current driver chips has some inherent shortcomings, such as only supporting a very narrow voltage input range, stroboscopic, difficult to constant power output and other fatal shortcomings.
This is also one of the main reasons hindering the further promotion of LED linear constant current drive

Method used

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  • Constant power linear constant current led drive control method and circuit structure
  • Constant power linear constant current led drive control method and circuit structure
  • Constant power linear constant current led drive control method and circuit structure

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Embodiment Construction

[0024] Embodiment of the present invention: a constant power linear constant current LED drive control method, the drive control method is when the full-wave rectified voltage reaches the sum of the forward voltage drop of the LED light string and the maximum allowable cathode voltage VDH of the light string , the load is powered by the capacitor; when the capacitor voltage drops to the sum of the forward voltage drop of the light string and the minimum allowable cathode voltage VDL of the light string, the full-wave rectified voltage is used to supply power again and the capacitor is charged.

[0025] The specific drive control process is:

[0026] Process 1. The AC input voltage of the LED light string first passes through the rectifier bridge to generate a full-wave rectified voltage VS, and then supplies power to the LED light string. At this time, the period of the full-wave rectified voltage VS is To;

[0027] Process 2. The LED light string with a forward voltage drop o...

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PUM

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Abstract

The invention discloses a constant power linear constant current LED driving control method. The driving control method is that when the full-wave rectification voltage reaches the sum of the forward voltage drop of the LED light string and the maximum allowable cathode voltage VDH of the light string, the driving control method is determined by The capacitor supplies power to the load; when the capacitor voltage drops to the sum of the forward voltage drop of the light string and the allowable minimum light string cathode voltage VDL, the power is supplied by the full-wave rectified voltage and the capacitor is charged again. The invention has a simple structure and is easy to manufacture. Strong practicality.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a constant power linear constant current LED drive control method and circuit structure. Background technique [0002] LED light-emitting diodes are now widely used in the lighting industry, and LEDs need to be in a stable working state and protected during the application process, that is, a driving circuit is required. At present, the main drive power supply is divided into three categories: switching power supply drive, non-isolated switch drive and linear constant current drive. Linear constant current drive, because of its simple design structure, extremely low cost, and the fact that it does not contain inductance and capacitance, has great advantages in product life and system cost, and occupies a large share in the market. However, the existing LED linear constant current drive chip generally adopts the architecture, which has some inherent shortcomings, such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 弋才敏李泽宏
Owner GUIZHOU E CHIP MICROELECTRONICS TECH CO LTD
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