| AVERD LABS CO., LTD. Patent applications |
| Patent application number | Title | Published |
|---|
| 20110187280 | PRIMARY DRIVE SYNCHRONOUS HIGH-SPEED SWITCHING RECTIFYING CIRCUIT FOR LLC HALF-BRIDGE POWER CONVERTER FOR DRIVING LED - Disclosed herein is a secondary rectifier for an LLC half-bridge power converter for driving an LED, which provides a power converter with efficiency and stability higher than a conventional power converter using a rectifying diode. The LLC half-bridge power converter does not employ a fast recovery diode or a Schottky diode for secondary rectification and uses FETs as rectifying elements to achieve high efficiency, high stability and low cost and small volume. | 08-04-2011 |
| 20110181205 | HALF-BRIDGE POWER CONVERTER FOR DRIVING LED BY SERIES-RESONANT CONNECTION OF INDUCTOR, INDUCTOR AND CAPACITOR - Disclosed herein is an LLC half-bridge power converter for driving an LED, which uses a CMOS timer IC having 50% duty cycle and a usable frequency range of 50 KHz through 1 MHz as a controller. In the LLC half-bridge power converter for driving an LED, the output of a rectifier is detected to operate an opto-coupler according to a soft-start set value and the opto-coupler is controlled to be turned off when the output of the rectifier exceeds a set rated voltage. The capacitance of a frequency varying condenser of the controller is varied by the opto-coupler to change the frequency of the controller so as to rapidly stabilize the output level and maintain a desired output level. | 07-28-2011 |
