POWER SUPPLY DEVICE, LUMINAIRE, AND POWER SUPPLYING METHOD

摘要

In a power supply device 1 including a switching element 12 and a control section 11 configured to control the switching element 12, the control section 11 receives an input of a first signal fluctuating according to an output voltage of the power supply device 1 and fixed with respect to an input voltage of the power supply device 1 and a second signal, the amplitude of which fluctuates according to the input voltage of the power supply device 1, and controls ON or OFF of the switching element 12 according to time until a value of the second signal reaches a value of the first signal.