English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

In this work, a novel off-line converter with power factor correction (PFC) and pulse-width modulated (PWM) dimming function employing a single active power switch is proposed for LED lighting. The proposed converter is a slightly modified flyback topology which enables the main switch to be used both for power factor correction and PWM high-frequency dimming with a constant peak on the current through the LEDs, thus conserving chromatic characteristics of emitted light. The proposed control scheme uses dutycycle to control the light level, while switching frequency is varied along to adjust the input power and keep a constant LED peak current. The converter is able to dim LEDs without losing its PFC characteristics. Mathematical description and experimental results of a prototype with 100 W of peak power fed from 127 V mains voltage are presented in this paper to show feasibility of the novel single-switch driver proposal. 1

A Novel Single-switch High Power Factor Led Driver Topology With High-frequency Pwm Dimming Capability