Illumination light communication device, and illumination apparatus and system including same

摘要

An illumination light communication device includes a light source unit including light emitting elements; a power supply unit controlling a load current flowing through the light source unit to be maintained at a constant; a switch element connected in series to the light source unit; and a control unit configured to control on/off of the switch element to modulate a light intensity of illumination light from the light source unit such that a binary communication signal is superimposed on the illumination light. The control unit has a switching circuit to open/close a path between the light source unit and the power supply unit, controls on/off of the switching circuit based on a dimming signal to perform a dimming control on the light source unit by a PWM control, and allows the communication signal to be superimposed on the illumination light in synchronization with an ON time of the switching circuit.

主权项

1. An illumination light communication device comprising:
a light source unit including light emitting elements; a power supply unit which controls a load current flowing through the light source unit to be maintained at a constant value; a switch element connected in series to the light source unit; and a control unit configured to control on/off of the switch element to modulate a light intensity of illumination light from the light source unit such that a binary communication signal is superimposed on the illumination light, wherein the control unit has a switching circuit to open and close a path connecting between the light source unit and the power supply unit, controls on/off of the switching circuit based on a dimming signal to perform a dimming control on the illumination light from the light source unit by a PWM control, and allows the communication signal to be superimposed on the illumination light from the light source unit in synchronization with an ON time of the switching circuit.