| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply device in which the primary coil of a transformer is an input side and a first and a second load respectively are connected to a secondary coil via a rectification circuit and to a tertiary coil via a voltage adjustment switching circuit, and which can reduce a switching loss and a surge voltage as to the switching element of the voltage adjustment switching circuit.SOLUTION: A voltage adjustment switching circuit 40 includes diodes D31 and D32 and switching elements Q31 and Q32. A controller 50, after turning switching elements Q11 and Q14 off in order to break positive half-wave electrical conduction to a primary coil T11, turns the switching element Q31 off in order to break positive half-wave electrical conduction in a tertiary coil T13. Also, after turning switching elements Q12 and Q13 off in order to break negative half-wave electrical conduction to the primary coil T11, the controller 50 turns the switching element Q32 off in order to break negative half-wave electrical conduction in the tertiary coil T13. |
