| 摘要 |
Disclosed is a driving circuit for a light-emitting device, which can realize stable alternating current drive in emergency power supply. The disclosed driving circuit for a light-emitting device comprises: an alternating current power supply; multiple light-emitting device groups driven using the alternating current power supply; an emergency power supply for generating a driving voltage for emergency power provided to the multiple light-emitting device groups in emergency; and an emergency power supply control part including an automatic transfer switch for selecting either the alternating current power supply or the emergency power supply. The emergency power supply control part includes an emergency power supply current control part for controlling an electric current for driving the multiple light-emitting device groups depending on the level of a direct current voltage provided from the emergency power supply. Therefore, the stable drive of the multiple light-emitting device groups can be realized even using a high-voltage direct current provided from the emergency power supply. |
