SELF-OSCILLATING RESONANT CONVERTER-BASED LIGHT EMITTING DIODE (LED) DRIVER
First Claim
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1. An apparatus, comprising:
- a self-oscillating resonator coupled to a light output node, the self-oscillating resonator comprising;
a first switch;
a second switch coupled to the first switch; and
an oscillating network comprising at least one inductor and at least one capacitor, the oscillating network coupled to the first switch and the second switch, and the oscillating network configured to generate an oscillating voltage signal at the light output node; and
a controller coupled to the self-oscillating resonator, wherein the controller is configured to start and stop the self-oscillating resonator to regulate a current through a load coupled to the light output node.
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Abstract
A self-oscillating resonator (SOR) may be used to control current through light emitting diodes (LEDs). The SOR may be started and stopped by a controller coupled to a transistor switch in the SOR. The controller may output a control signal that starts and stops the SOR by coupling a supply voltage or a ground to a base of the transistor switch in the SOR. Additional control over the current output to the LEDs may be gained through a resistive DAC coupled to the SOR and duty cycling the SOR.
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Citations
30 Claims
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1. An apparatus, comprising:
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a self-oscillating resonator coupled to a light output node, the self-oscillating resonator comprising; a first switch; a second switch coupled to the first switch; and an oscillating network comprising at least one inductor and at least one capacitor, the oscillating network coupled to the first switch and the second switch, and the oscillating network configured to generate an oscillating voltage signal at the light output node; and a controller coupled to the self-oscillating resonator, wherein the controller is configured to start and stop the self-oscillating resonator to regulate a current through a load coupled to the light output node. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method, comprising:
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generating an oscillating voltage output at a light output node from an oscillating network of a self-oscillating resonator; starting a self-oscillating resonator by turning on a first switch with a control signal; and stopping the self-oscillating resonator with the control signal, wherein the control signal starts and stops the oscillating network to regulate a current through a light output load coupled to the oscillating network. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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27. An apparatus, comprising:
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a light source; a line voltage input node configured to receive a line voltage; a self-oscillating resonator coupled to the light source and coupled to the line voltage input node, wherein the self-oscillating resonator is configured to output power to the light source during an active phase of a period of the line voltage and configured to not output power to the light source during a dimmer phase of the period of the line voltage; and a controller coupled to the self-oscillating resonator, wherein the controller is configured to start and to stop the self-oscillating resonator to regulate current through the light source. - View Dependent Claims (28, 29, 30)
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Specification