Power supply and power supply system

Abstract

An embodiment of the present invention is a power supply capable of switching between a power saving mode and a normal power mode, and includes: a first power supply line that is an output line of a DC power supply; a first control IC configured to constantly operate and control the first power supply line; a second control IC configured to operate in the normal power mode and not to operate in the power saving mode; and a transformer configured to output a voltage of the first power supply line and including an auxiliary winding used to generate power to be supplied to the first control IC and the second control IC. In a case of transition from the power saving mode to the normal power mode, a load current of the first power supply line increases before start of supply of power to the second control IC.

Dependencies are inferred from the claim text.