Light-emitting diode circuit and light-emitting device having the same

摘要

A light-emitting device includes multiple light-emitting diode units sequentially connected and coupled to a first power source, a switching circuit connected to the light-emitting diode units, a second power source, and a control module. Power provided by the first power source is larger than power provided by the second power source. The second power source is connected to the light-emitting diode units through the switching circuit, which is controlled by the control module to facilitate the delivery of the power of the first power source or the second power source to the light-emitting diode units. When the first power source serves to deliver the power thereof to the light-emitting diode units, the light-emitting diode units may be in a serial conduction. When the second power source serves to deliver the power thereof to the light-emitting diode units, the light-emitting diode units may be in a parallel conduction.

主权项

1. A light-emitting device comprising:
a plurality of sequentially connected LED units electrically connected to a first power source with a first power voltage; a switching circuit electrically coupled to the LED units; a second power source configured to provide with a second power voltage at a lower voltage value than the first power voltage, the second power source electrically coupled to the LED units through the switching circuit; a control module in connection with the switching circuit for controlling the switching circuit to selectively switch power delivery from the first power source and the second power source to the light-emitting diode units; wherein when the first power voltage is delivered from the first power source to the LED units, the control module controls the switching circuit to establish serial connection between the LED units, wherein when the second power voltage is delivered from the second power source to the LED units, the control module controls the switching circuit to establish parallel connection between the LED units.