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Touch-type built-in full closed-loop control led dimming drive circuit

A technology of dimming drive and touch control, applied in the direction of electric light circuit layout, light source, electric light source, etc., can solve the problems of mass production inductance value deviation, input voltage fluctuation, general effect, etc., so as to reduce the risk of failure and make the circuit reliable. The effect of improving performance and reliability

Active Publication Date: 2017-01-11
闵长伟
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

( figure 2 ) This is a simple and effective control strategy, but since this is an open-loop control mode, it can only detect the peak current on the inductor, but cannot detect the output current, and the output current accuracy is prone to deviations in three situations: 1. Input voltage fluctuation
(Open-loop control, unable to feedback, caused by system delay); 2. Deviation of inductance value in mass production
(The change of L causes the change of Io); 3. The LED load voltage is not the same (Vo). For the first kind of deviation, only the method of voltage compensation can be adopted, that is, to detect the input voltage and adjust the internal CS reference level value according to the input voltage, but the effect Generally, for the second and third deviations, it is more difficult to solve

Method used

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  • Touch-type built-in full closed-loop control led dimming drive circuit
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  • Touch-type built-in full closed-loop control led dimming drive circuit

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Embodiment Construction

[0029] The external programmable PWM signal input provided by the chip DU8623 used in the present invention controls the output of the chip PWM signal via the MCU, and sets the output duty ratio of the PWM signal;

[0030] in figure 1 In, when the touch point is touched by hand (ON / OFF-DIMMER point or other contact points on the circuit, 1-8 touch points can be connected), the clutter signal induced by the human body enters the MUC chip through the resistance, which activates The data storage circuit inside the MCU chip, the data storage circuit will then compose the programmed LED light source output current duty cycle data, and send the data to the main control calculation circuit, and then use the above data to establish an internal database, through the database Convert the signal into the actual output duty cycle signal of the LED, and send the corresponding control signal to the DU8623 DIM dimming pin according to the set data, so that the LED can adjust its luminous flux o...

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Abstract

The invention relates to a touch internal full-closed-loop control LED dimming drive circuit and aims to provide a novel full-closed-loop control strategy to fully avoid deviations and substantially realize true LED constant current. The touch internal full-closed-loop control LED dimming drive circuit comprises a data storage circuit, an input circuit, a master control computing circuit and a self-calibration circuit. The touch internal full-closed-loop control LED dimming drive circuit has the function of opening and short circuit protection for an Rcs sampling resistor. The touch internal full-closed-loop control LED dimming drive circuit is applicable to LED drive power sources.

Description

Technical field [0001] The present invention relates to an LED drive circuit, and more specifically, to a touch-type built-in wide voltage input LED dimming drive circuit. Background technique [0002] In view of the load characteristics of LED desk lamps, there are not many solutions that use wide voltage 100-265V built-in touch dimming drive, and the topology of using non-isolated constant current drive power is basically a BUCK step-down structure, which will eliminate non-isolated The development of LED constant current control technology is divided into three generations, discussing the development of control strategies to realize the principle of constant current, analyzing the advantages and disadvantages of each generation, and what breakthrough progress each generation has. Based on the DU8623 chip, introduces the latest generation of integrated closed-loop current control technology, and introduces in detail how this control strategy can improve the accuracy of LED outp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 闵长伟
Owner 闵长伟
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