Method and apparatus for extending the power output range of a power converter used for a lighting system
First Claim
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1. A power conversion system with a delayed start time, comprising:
- a voltage detector for receiving a rectified voltage; and
comparing a reference voltage and the rectified voltage to generate an output signal when the rectified voltage exceeds the reference voltage;
a delay timer configured to;
receive the output signal and generate a sink signal and an enable signal;
a power converter enabled by the enable output signal; and
a current sink circuit comprising a transistor for drawing a sink current from a source of the rectified voltage and an analog switch comprising a switch output coupled to the gate of the transistor and inputs configured to receive the sink signal, the enable signal and a voltage signal;
wherein the analog switch connects the switch output to a constant current when the power converter is not enabled and connects the switch output to a variable voltage circuit when the power converter is enabled.
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Abstract
A method and system for extending the power output range of a power converter used for a lighting system is disclosed.
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Citations
23 Claims
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1. A power conversion system with a delayed start time, comprising:
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a voltage detector for receiving a rectified voltage; and comparing a reference voltage and the rectified voltage to generate an output signal when the rectified voltage exceeds the reference voltage; a delay timer configured to;
receive the output signal and generate a sink signal and an enable signal;a power converter enabled by the enable output signal; and a current sink circuit comprising a transistor for drawing a sink current from a source of the rectified voltage and an analog switch comprising a switch output coupled to the gate of the transistor and inputs configured to receive the sink signal, the enable signal and a voltage signal; wherein the analog switch connects the switch output to a constant current when the power converter is not enabled and connects the switch output to a variable voltage circuit when the power converter is enabled. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A dimmer for use with a lighting system, comprising:
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a rectifier circuit for receiving an alternating current (AC) input and producing a direct current (DC) output; a voltage detector for generating an output signal when the DC output exceeds a threshold voltage; a delay timer configured to;
receive the output signal and generate a sink signal and an enable signal;a power converter enabled by the enable signal; and a current sink circuit comprising a transistor for drawing a sink current from a source of the rectified voltage and an analog switch comprising a switch output coupled to the gate of the transistor and inputs configured to receive the sink signal, the enable signal and a voltage signal; wherein the analog switch connects the switch output to a constant current when the power converter is not enabled and connects the switch output to a variable voltage circuit when the power converter is enabled. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of dimming a lighting system, comprising:
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receiving, by a rectifier circuit, an alternating current (AC) input and producing a direct current (DC) output; generating, by a voltage detector, a signal indicating that the DC output exceeds a threshold voltage; measuring, by a delay timer, a first time interval that is initiated by the signal; generating, by the delay timer, a sink signal and an enable signal; enabling a power converter based on the enable signal; providing, by the power converter, a voltage to a load; and drawing current, by a current sink circuit, from the DC output of the rectifier circuit in response to a voltage signal, the sink signal, and the enable signal when the power converter is not enabled. - View Dependent Claims (21, 22, 23)
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Specification