| 摘要 |
A lighting apparatus comprises: a lighting circuit; a dimming signal circuit RSFF1; and a feedforward control circuit FF. The lighting circuit receives an output VDC which is rectified and smoothed commercial power Vin, and supplies power to a light source Lamp 1. The dimming signal circuit RSFF1 sends a timing signal to the lighting circuit, wherein the timing signal is a signal for switching an output of the lighting circuit periodically to an ON state and either of an OFF state and a dimmed state. The feedforward control circuit FF detects either of an input voltage of the lighting circuit and an input voltage of the smoothing circuit, and sends a control signal to the dimming signal circuit, wherein the control signal is a signal for correcting a lighting time so that a light output of the light source can become a desired value. |
