Power Supply Circuit and Illumination Apparatus

摘要

According to one embodiment, provided is a power supply circuit including a power conversion unit, a controller, and an integrated circuit. The power conversion unit converts an AC voltage into a different voltage. The integrated circuit includes a current regulator that can switch between a first state in which a part of a current flowing through the power supply path flows to an input terminal and a second state in which a current flowing to the input terminal is lower than that of the first state, a controller power supply that converts a voltage into a driving voltage and supplies the driving voltage to the controller, a connection terminal for connecting an auxiliary power supply used for generating the driving voltage, and a protection circuit that blocks or decreases, when an auxiliary power supply voltage of the auxiliary power supply decreases, a current flowing to the input terminal.

主权项

1. A power supply circuit comprising:
a power conversion unit that converts an AC voltage, supplied through a power supply path, into a different voltage and supplies the converted voltage to a load; a controller that controls the power conversion unit to perform the voltage conversion; and an integrated circuit including:
an input terminal that is electrically connected to the power supply path,a current regulator that can switch between a first state in which a part of a current flowing through the power supply path flows to the input terminal and a second state in which a current flowing to the input terminal is lower than that of the first state,a controller power supply that converts a voltage, supplied through the current regulator, into a driving voltage corresponding to the controller and supplies the driving voltage to the controller,a connection terminal for connecting an auxiliary power supply which is used for generating the driving voltage, anda protection circuit that blocks or decreases, when an auxiliary power supply voltage of the auxiliary power supply decreases, a current flowing to the input terminal.