National Cheng-Kung University

Wei-Jing Tseng

Tsorng-Juu Liang

Jiann-Fuh Chen

Chi-Hung Lin

A method for estimating an output voltage of an isolated resonant converter is disclosed. The proposed method, wherein the isolated resonant converter includes a transformer having an auxiliary winding and a secondary winding, a first output diode electrically connected to the secondary winding in series and a voltage holder coupled to the auxiliary winding, includes: obtaining the output voltage where v(t) is an output voltage of the voltage holder, Vis a forward voltage drop of the first output diode, Nis a number of turns of the secondary winding and Nis a number of turns of the auxiliary winding.

Methods for estimating output current or output voltage of isolated resonant converter

Configurations for an LED driver are disclosed. The proposed LED driver receives an input voltage, drives an LED and includes a compensation capacitor set including a first and a second capacitors connected to each other in series, wherein the first capacitor is electrically connected to the LED, the second capacitor is grounded, the compensation capacitor set provides a compensation voltage to the LED such that the LED is conductible when an instantaneous voltage value of the input voltage is lower than an LED conduction voltage.

Growing community of inventors

Tainan, Taiwan

Wei-Jing Tseng