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De-electrolytic capacitor led driver based on pwm duty cycle control strategy

A technology of LED driver and control strategy, applied in the direction of electric light source, electrical components, electroluminescent light source, etc., can solve the problems of large leakage inductance of inductance, low efficiency capacitance, etc., to improve the life of the circuit, realize stability, and simplify the control circuit Effect

Inactive Publication Date: 2018-01-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the inductor has a relatively large leakage inductance, it is less efficient than the capacitor

Method used

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  • De-electrolytic capacitor led driver based on pwm duty cycle control strategy
  • De-electrolytic capacitor led driver based on pwm duty cycle control strategy

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Embodiment Construction

[0033] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] Such as figure 1 As shown, the LED driver of the PWM duty cycle control strategy of the present invention without electrolytic capacitors includes: a full-wave rectifier bridge, an input low-pass filter, a voltage adopter, a single-tube flyback transformer, a fast recovery diode, an LC series-parallel resonance, Filter inductor, control circuit (including UC3844 chip);

[0035] Wherein: the full-wave rectifier bridge is connected with the input power frequency voltage and the input low-pass filter, mainly performs full-wave rectification on the power-frequency alternating current, and inputs the waveform after the full-wave rectification of the power-frequency alternating current into the input low-pass filter ;

[0036]The input low-pass filter ...

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Abstract

The invention discloses a de-electrolytic capacitor LED driver based on a PWM duty cycle control strategy, comprising: a full-wave rectifier bridge, an input low-pass filter, a voltage sampling, a control circuit, a single-tube flyback transformer, a fast recovery diode, an LC Series-parallel resonance, filter inductor, UC3844 chip; not only realizes the replacement of electrolytic capacitors with film capacitors, but also uses the waveform of sampling full-wave rectification to modulate the PWM duty cycle after processing by the control circuit, which simplifies the control circuit and realizes stability of the control circuit. Because no electrolytic capacitor is introduced, the life of the AC / DC LED driver is increased, and because the LED light-emitting diode is not driven by a pulse current, the damage to the human eye caused by the flicker of the LED light-emitting diode is avoided.

Description

technical field [0001] The invention belongs to the technical field of LED driving, and in particular relates to a non-electrolytic capacitor driving circuit for an LED driver by changing the PWM duty cycle. Background technique [0002] In recent years, with the development of new materials and the improvement of technology, LED light source is called the fourth generation of new light source due to its high luminous efficiency, long life, small size, green and pollution-free, and is widely used in various lighting occasions Among them, such as LCD backlight, traffic lights, billboards, car lights and general home lighting. [0003] Compared with traditional light sources, LED has many unique characteristics and performance. LED is a low voltage DC device, its current and voltage characteristics are nonlinear, and the change of current will not only affect the luminous brightness, but also cause the change of color temperature, so the LED needs a special driver to ensure t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/44
Inventor 陈祥杰王曦王伟印杜丽虞丹群
Owner ZHEJIANG UNIV