Lighting device, lighting apparatus using the same, and lighting system

摘要

A control unit controls an operation of an electric power conversion unit so that load current that flows through a light source load becomes a constant value, using electric power setting value that is used to determine a size of electric power that is supplied to the light source load and a current detection value that is detected by a current detection resistor (current detection unit), and a load electric power calculation unit obtains load electric power of the light source load using the electric power setting value and a voltage detection value that is detected by a voltage detection unit, and an input electric power estimation unit corrects a circuit loss for the obtained load electric power and estimates input electric power.

主权项

1. A lighting device comprising:
an electric power conversion unit comprising a switching element, configured to adjust load electric power that is supplied to a light source load using DC electric power as an input by ON/OFF of said switching element; a current detection unit configured to detect load current that flows through said light source load; a voltage detection unit configured to detect load voltage that is applied to said light source load; a control unit configured to control an operation of said electric power conversion unit so that said load current that flows through said light source load becomes a constant value, using an electric power setting value that is used to determine a size of electric power that is supplied to said light source load and a current detection value that is detected by said current detection unit; a load electric power calculation unit configured to obtain load electric power of said light source load using said electric power setting value and a voltage detection value that is detected by said voltage detection unit; an input electric power estimation unit configured to correct a circuit loss for the obtained load electric power and estimate input electric power; and a notification unit configured to notify an outside of a calculation result that is obtained in said input electric power estimation unit.