| 摘要 |
A power supply unit having a series regulator that changes an input DC voltage input from a DC power supply into a stabilized output DC voltage lower than the input DC voltage, includes: a power consuming unit, provided on a direct current path between the DC power supply and the series regulator, including a parallel circuit formed by a first fixed resistor and a semiconductor device; and a current setting unit operable to set the amount of a current flowing between a current input and a current output of the semiconductor device, wherein the current input of the semiconductor device is arranged on the DC power supply side thereof, the current output of the semiconductor device is arranged on the series regulator side thereof, and a setting input of the semiconductor device is connected to a setting output of the current setting unit.
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