Driving design of LED brightness control based on DC / DC boost converter

1 Introduction LED has been widely used in lighting, backlight and other fields because of its low power consumption, high luminous efficiency and long service life. The brightness of LED is directly proportional to the working current. In order to maintain the stability of brightness, a stable constant current power supply is needed. In terms […]

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Topology circuit design of converter based on AC LED lamp

Aiming at the problems of low power factor and increased harmonic component caused by the filter capacitor of the traditional LED lamp rectifier circuit, a new AC LED converter topology circuit is proposed. The buck PFC power factor correction circuit and LCC circuit are analyzed in detail. The working principle, switching frequency and capacitance of […]

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Circuit design of LED flash lamp system

preface In recent years, due to the increasing attention to the performance development and energy saving of LED, LED is used for lighting, backlight of ultra-thin TV and other purposes. It is expected to be widely used as the light source of various equipment in the future. The high brightness LED can be used as […]

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Dimming circuit design of LED multi lamp parallel connection

1、 OverviewLED bulb has excellent energy efficiency and long service life. It is considered by the market as a powerful substitute for incandescent lamp and compact fluorescent lamp. However, at present, the main obstacles affecting large-scale adoption come from the relatively expensive procurement cost and the dimming compatibility problem like compact fluorescent lamps. For most […]

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How to realize constant current control of LED lighting circuit

1 Introduction According to the characteristics of LED lighting load, the current topology of non isolated constant current driving power supply is basically buck buck buck structure. The mainstream scheme is to fix the peak current through fixed off time, so as to achieve the control strategy of fixed output current. This paper will discuss […]

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Design of non isolated LED driving circuit based on a high power factor

introduction As an emerging industrial technology, LED lighting is constantly developing a wider range of applications. For AC power input applications, switching power supply based on flyback topology is usually used at present. Flyback topology switching power supply includes input rectifier filter circuit, switch control circuit, isolation transformer and secondary rectifier filter circuit. However, the […]

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