| 摘要 |
<P>PROBLEM TO BE SOLVED: To avoid imbalance of switching loss of a plurality of switching elements, thereby preventing the temperature rise of the switching elements. <P>SOLUTION: A power-supply device includes: a series circuit of first and second switching elements that are complementarily switched on a primary side of an output transformer; a load and load detection means for detecting an output current to the load or a load voltage on a secondary side of the output transformer; drive control means for driving and controlling the switching elements; and output control means for outputting a desired constant current or a desired constant voltage. If the ON time of the first switching element is different from the ON time of the second switching element, the drive control means changes the ON time of the first switching element and the ON time of the second switching element when a predetermined condition is established. <P>COPYRIGHT: (C)2013,JPO&INPIT |
