| 摘要 |
PROBLEM TO BE SOLVED: To provide a power unit which can perform highly accurate output control at a low cost and moreover without requiring complicated control. SOLUTION: When a CPU 34 controls the application/nonapplication to the primary winding of a transformer 14 of DC voltage generated by DC power source 30, so that the output voltage B reaches an object level by using a switch circuit 18, based on the output state detection voltage C output from a detection circuit 20, the detecting circuit 20 performs operation using the level of a signal, which shows the magnitude of output voltage B and the level of the variable reference voltage F inputted from an output variable circuit 22 and outputs it as output state detection voltage C to the CPU 34. Here, the output variable circuit 22 generates variable reference voltage F, so that the output state detection voltage C reaches predetermined certain level.
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