DRIVING CIRCUIT, LIGHTING DEVICE AND METHOD OF REDUCING POWER DISSIPATION
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Abstract
A driving circuit comprises a transformer, a first capacitor and a first controller. The transformer includes a primary winding and a secondary winding. The secondary winding is located in a secondary side and configured to generate a power. The first capacitor is connected in series to the primary winding, wherein the first capacitor and the transformer are configured to form a resonance unit. The first controller is configured to obtain a feedback current from the secondary side, and change a working frequency of the resonance unit based on the feedback current so as to change the power.
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Citations
29 Claims
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1-6. -6. (canceled)
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7. A driving circuit, comprising:
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a transformer including a primary winding and a secondary winding, the secondary winding being located on a secondary side and configured to generate a power; a first capacitor connected in series to the primary winding, wherein the first capacitor and the transformer are configured to form a resonance unit; a first controller configured to obtain a feedback current from the secondary side, and change the working frequency of the resonance unit based on the feedback current so as to change the power; wherein the secondary side further comprises a first rectifier connected to the secondary winding, and the first rectifier is configured to cut off the power when a voltage on the first rectifier is lower than a first voltage threshold, wherein the first rectifier comprises a Metal-Oxide-Semiconductor Field Effect Transistor. - View Dependent Claims (8, 9, 10, 11)
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12-23. -23. (canceled)
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24. A driving circuit, comprising:
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a transformer including a primary winding and a secondary winding, the secondary winding being located in a secondary side and configured to generate a power; a first capacitor connected in series to the primary winding, wherein the first capacitor and the transformer are configured to form a resonance unit; a first controller configured to obtain a feedback current from the secondary side, and change a working frequency of the resonance unit based on the feedback current; and
whereinthe resonance unit is configured to oscillate on the changed working frequency so as to output changed power; a plurality of LED elements connected to the secondary side of the driving circuit, wherein the LED elements work in a range between about a normal working current and about a peak pulse current; wherein the secondary side further comprises a first rectifier connected to the secondary winding, and the first rectifier is configured to cut off the power when a voltage on the first rectifier is lower than a first voltage threshold, wherein the first rectifier comprises a Metal-Oxide-Semiconductor Field Effect Transistor. - View Dependent Claims (25, 26, 27, 28)
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29-37. -37. (canceled)
Specification