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,wherein an emitter of the first switch is coupled to a base of the second 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, wherein the controller is coupled to a base of the second switch;
to receive a dim data signal; and
to time the start and the stop of the self-oscillating resonator to perform duty cycling of the self-oscillating resonator for dimming the load coupled to the light output node based, at least in part, on the received dim data signal.
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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
27 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, wherein an emitter of the first switch is coupled to a base of the second 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, wherein the controller is coupled to a base of the second switch; to receive a dim data signal; and to time the start and the stop of the self-oscillating resonator to perform duty cycling of the self-oscillating resonator for dimming the load coupled to the light output node based, at least in part, on the received dim data signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. 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 comprising a first switch and a second switch; receiving a dim data signal; starting the self-oscillating resonator by turning on the second switch with a control signal at a first time during a line cycle based, at least in part, on the received dim data signal; and stopping the self-oscillating resonator with the control signal at a second time during the line cycle based, at least in part, on the received digital dim data, wherein the control signal starts and stops the oscillating network to regulate a current through a light output load coupled to the oscillating network by duty cycling the self-oscillating resonator for dimming the light output load coupled to the light output node generating the control signal from a controller coupled to the self-oscillating resonator, wherein the controller is coupled to a base of the switch and wherein an emitter of the first switch is coupled to a base of the second switch. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. 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 wherein the self-oscillating resonator comprises; a first switch; and a second switch coupled to the first switch, wherein an emitter of the first switch is coupled to a base of the second switch; 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, wherein the controller is coupled to a base of the second switch; to receive a dim data signal; and to time the start and the stop of the self-oscillating resonator to perform duty cycling of the self-oscillating resonator for dimming the load coupled to the light output node based, at least in part, on the received digital dim data signal. - View Dependent Claims (26, 27)
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Specification