Illumination apparatus and lighting circuit

摘要

An illumination apparatus includes a light emitting unit having at least one first light emitting element and at least one second light emitting element connected in series with each other. Further, the illumination apparatus includes a keying circuit for electrically closing a first power supply path which passes through both the first and the second light emitting element from the power supply circuit or the capacitive element or a second power supply path which passes through the first light emitting element without passing through the second light emitting element from the capacitive element. The keying circuit is set in a state in which the first power supply path is electrically closed during a power supply, and is set in a state in which the second power supply path is electrically closed when a reduction in quantity of charges of the capacitive element is detected after the power supply is stopped.

主权项

1. An illumination apparatus comprising:
a power supply circuit; a capacitive element connected between output terminals of the power supply circuit; a light emitting unit including at least one first semiconductor light emitting element and at least one second semiconductor light emitting element connected with the at least one first semiconductor light emitting element in series; and a keying circuit provided between the capacitive element and the light emitting unit and configured to electrically open or close a first power supply path which passes through both the at least one first semiconductor light emitting element and the at least one second semiconductor light emitting element from the power supply circuit or the capacitive element, and a second power supply path which passes through the at least one first semiconductor light emitting element without passing through the at least one second semiconductor light emitting element from the capacitive element, wherein the keying circuit is set in a first state in which the first power supply path is electrically closed and the second power supply path is electrically opened while a power from the power supply circuit is being supplied, and is set in a second state in which the first power supply path is electrically opened and the second power supply path is electrically closed when a reduction in quantity of charges of the capacitive element is detected after the power supplied from the power supply circuit is stopped.