Touch internal full-closed-loop control LED dimming drive circuit

A technology of dimming drive and touch control, which is applied in the direction of lamp circuit layout, light source, electric light source, etc. It can solve the problems of input voltage fluctuation, mass production inductance value deviation, and general effect, so as to improve circuit reliability and reduce faults The effect of risk and reliability improvement

Active Publication Date: 2014-12-17
闵长伟
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  • 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. The output current accuracy is prone to deviations in three situations: 1. Input voltage fluctuations
(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 internal full-closed-loop control LED dimming drive circuit
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  • Touch internal 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 through the MCU, and sets the output duty cycle of the PWM signal;

[0030] exist figure 1In the process, when the touch point is short-touched by hand (ON / OFF-DIMMER point or other contact point on the circuit, 1-8 touch points can be connected), the clutter signal induced by the human body enters the MUC chip through the resistor, thus activating The data storage circuit inside the MCU chip stores the data circuit and then sends the programmed LED light source output current duty ratio data to the main control calculation circuit, and then uses the above data to establish an internal database. Through the database Convert the signal into the duty ratio signal of the actual output 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 lumino...

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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 invention relates to an LED driving circuit, more specifically, to a touch-type built-in wide voltage input LED dimming driving circuit. Background technique [0002] According to the load characteristics of LED desk lamps, there are not many schemes using wide voltage 100-265V built-in touch dimming drivers, and the topology structure of using non-isolated constant current driving power is basically a BUCK step-down structure, which will use non-isolated The development of LED constant current control technology is divided into three generations, discuss the development of the principle of control strategy to achieve constant current, analyze the advantages and disadvantages of each generation, and what breakthroughs each generation has. Based on the DU8623 chip, introduce the latest generation of integrated closed-loop current control technology, and introduce in detail how this control strategy makes breakthroughs in improving the accura...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 闵长伟
Owner 闵长伟
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