DIMMING DEVICE

摘要

A determiner determines whether an illumination load is an LED illumination device or an incandescent lamp, based on a voltage of a rectifier within a time period from start of supply of the AC voltage to the rectifier to a time a predetermined time elapses. A control circuit controls a driver under a condition where values of a conduction angle of a switch corresponding to magnitudes of the first DC voltages except a maximum and a minimum thereof in a case where the determiner determines that the illumination load is the LED illumination device are smaller than values of the conduction angles of the switch of a case where the determiner determines that the illumination load is the incandescent lamp.

主权项

1. A dimming device, comprising:
a pair of terminals; a switch connected between the pair of terminals; a driver configured to turn on and off the switch; a control circuit configured to control the driver; a rectifier connected between the pair of terminals in parallel to the switch and configured to perform full-wave rectification on an AC voltage; a power supply configured to generate a predetermined DC voltage from a voltage obtained by full-wave rectification on the AC voltage by the rectifier to supply the predetermined DC voltage to the driver and the control circuit; and a setter configured to set a first DC voltage that corresponds to a conduction angle of the switch, the control circuit being configured to control the driver to provide reverse phase control based on the AC voltage and to control the driver in accordance with a magnitude of the first DC voltage set by the setter to thereby adjust a value of the conduction angle of the switch, the control circuit including a determiner configured to, when a series circuit of an illumination load and an AC power source for supplying the AC voltage is connected between the pair of terminals, determine whether the illumination load is an LED illumination device including a capacitor or an incandescent lamp, the determiner being configured to determine whether the illumination load is the LED illumination device or the incandescent lamp, based on a second DC voltage within a predetermined time period from start of supply of the AC voltage to the rectifier, the second DC voltage corresponding to the voltage obtained by full-wave rectification on the AC voltage by the rectifier, and the control circuit being configured to control the driver under a condition where values of the conduction angle of the switch corresponding to magnitudes of the first DC voltages except a maximum and a minimum thereof in a case where the determiner determines that the illumination load is the LED illumination device are smaller than values of the conduction angles of the switch of a case where the determiner determines that the illumination load is the incandescent lamp.