PURPOSE: To absorb fluctuation of parts and reduce power loss by feeding a power supply from a secondary coil winding of a feedback transformer to a switching control part of each switching element and then providing a timing control part for giving OFF timing of each switching element.
CONSTITUTION: Swltching control parts 1 and 2 for controlling transistors Q1 and Q2 as main switching elements of an inverter are provided, thus obtaining the power supply of the switching control parts 1 and 2 from a feedback transformer CT. Also, a timing control part 3 for giving a timing for turning off the transistors Q1 and Q2 is provided for the switching control parts 1 and 2, thus absorbing fluctuation of parts constituting the inverter, reducing power loss which is generated by the power supply for driving and controlling the main switching element of the inverter, and avoiding delay in control timing due to phase delay of a feedback transformer.
YAMADA KOJI
YAMANAKA YUKIO
