Alternating current light emitting device
First Claim
Patent Images
1. An alternating current (AC) light emitting device, comprising:
- a control unit; and
a plurality of LEDs electrically connected to the control unit, wherein each LED of the plurality of LEDs has an anode and a cathode which are connected to the control unit, and when the plurality of LEDs is driven by an AC voltage source, the control unit changes serial or parallel connection states of the LEDs according to a voltage of the AC voltage source so that currents flowing through the LEDs become uniform;
wherein the control unit enables most of the LEDs to be connected in parallel when the voltage of the AC voltage source is lower, and enables most of the LEDs to be connected in series when the voltage of the AC voltage source is higher.
2 Assignments
0 Petitions
Accused Products
Abstract
An alternating current (AC) light emitting device includes an AC light emitting diode (LED) module and a waveform modulation unit. The AC LED module includes at least two sets of micro-diodes. The waveform modulation unit coupled between the AC LED module and an AC voltage source modulates a waveform of the AC voltage source.
22 Citations
12 Claims
-
1. An alternating current (AC) light emitting device, comprising:
-
a control unit; and a plurality of LEDs electrically connected to the control unit, wherein each LED of the plurality of LEDs has an anode and a cathode which are connected to the control unit, and when the plurality of LEDs is driven by an AC voltage source, the control unit changes serial or parallel connection states of the LEDs according to a voltage of the AC voltage source so that currents flowing through the LEDs become uniform; wherein the control unit enables most of the LEDs to be connected in parallel when the voltage of the AC voltage source is lower, and enables most of the LEDs to be connected in series when the voltage of the AC voltage source is higher. - View Dependent Claims (2, 3)
-
-
4. An alternating current (AC) light emitting device, comprising:
-
a plurality of light emitting arrays, wherein each of the plurality of light emitting arrays has a plurality of light emitting diodes (LEDs) having a same sized LED area connected in parallel with an anode and a cathode of each of the parallel connected LEDs being directly connected to the control unit, the LED areas of each of the light emitting arrays are different; and a control unit for respectively controlling the plurality of light emitting arrays, wherein when the plurality of light emitting arrays is driven by an AC voltage source, the control unit sequentially turns on the light emitting arrays and connected in parallel or serial according to a voltage of the AC voltage source. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
-
Specification