Lighting apparatus, backlight apparatus

摘要

A lighting apparatus includes: a lighting circuit; a dimming signal circuit; and a feedforward control circuit. The lighting circuit receives an output which is rectified and smoothed commercial power, and supplies power to a light source Lamp. The dimming signal circuit 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 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.

主权项

1. A lighting apparatus, comprising:
a rectifier configured to rectify a commercial power; at least one smoothing circuit configured to smooth an output of the rectifier; a lighting circuit configured to receive an output of the smoothing circuit and configured to supply power to a light source; a dimming signal circuit configured to send a timing signal to the lighting circuit, the timing signal being for switching an output of the lighting circuit periodically to an ON state and either of an OFF state and a dimmed state, the ON state being a lighting period of the light source, the OFF state being a shut-off period thereof, and the dimmed state being a dimming period thereof; and a feedforward control circuit configured to detect either of an input voltage of the lighting circuit and an input voltage of the smoothing circuit, and configured to send a control signal to the dimming signal circuit, the control signal being for correcting a period of the ON state based on the detected input voltage so that an average of a light output of the light source in a period during the ON state and the OFF state are alternately switched, or in a period during the ON state and the dimmed state are alternately switched, can become a desired value; wherein the dimming signal circuit sets the period of the ON state of the lighting circuit to a period having a time ratio of 95% or less with respect to the sum of the period of the ON state and the period of the OFF state.