METHOD FOR TURN ON POWER FOR HIGH FREQUENCY POWER LOAD AND CONTROLLER FOR HIGH FREQUENCY POWER LOAD EMPLOYING THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for turn on power stably for high frequency power load using a current limit function and a power supply circuit for high frequency power load using that method. SOLUTION: Predetermined time before turning a power switch on, a switch with current limit function is turned on to feed a high frequency power load with a predetermined quantity of current. In the power supply circuit for high frequency power load using a current limit resistor, a series circuit of a current limit resistor 11 and a second switch 10 is connected in parallel with a first power switch. When power is turned on for a high frequency power load 3A, the first switch 4 is turned on upon elapse of a predetermined time after turning the second switch 10 on.