POWER CONTROL SYSTEM FOR CURRENT REGULATED LIGHT SOURCES
First Claim
1. A light emitting diode (LED) lighting system comprising:
- a power factor correction (PFC) and LED drive controller, the controller comprising;
a digital signal processor, coupled to the LED feedback node and configured to;
operate from a digital level supply voltage;
generate a PFC control signal; and
generate an LED current control signal;
a first buffer, coupled to the processor, and configured to;
operate from a medium level supply voltage, wherein the medium level supply voltage is greater than the digital level supply voltage;
receive the PFC control signal; and
convert the PFC control signal into a PFC switch control signal to control conductivity of a high voltage PFC switch; and
a second buffer, coupled to the processor, and configured to;
operate from the medium level supply voltage;
receive the LED current control signal; and
convert the LED current control signal into an LED current control switch signal to control conductivity of a high voltage LED current control switch.
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Accused Products
Abstract
A light emitting diode (LED) lighting system includes a PFC and output voltage controller and a LED lighting power system. The controller advantageously operates from an auxiliary voltage less than a link voltage generated by the LED lighting power system. The common reference voltage allows all the components of lighting system to work together. A power factor correction switch and an LED drive current switch are coupled to the common reference node and have control node-to-common node, absolute voltage that allows the controller to control the conductivity of the switches. The LED lighting system can utilize feed forward control to concurrently modify power demand by the LED lighting power system and power demand of one or more LEDs. The LED lighting system can utilize a common current sense device to provide a common feedback signal to the controller representing current in at least two of the LEDs.
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Citations
30 Claims
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1. A light emitting diode (LED) lighting system comprising:
a power factor correction (PFC) and LED drive controller, the controller comprising; a digital signal processor, coupled to the LED feedback node and configured to; operate from a digital level supply voltage; generate a PFC control signal; and generate an LED current control signal; a first buffer, coupled to the processor, and configured to; operate from a medium level supply voltage, wherein the medium level supply voltage is greater than the digital level supply voltage; receive the PFC control signal; and convert the PFC control signal into a PFC switch control signal to control conductivity of a high voltage PFC switch; and a second buffer, coupled to the processor, and configured to; operate from the medium level supply voltage; receive the LED current control signal; and convert the LED current control signal into an LED current control switch signal to control conductivity of a high voltage LED current control switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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operating a digital signal processor of a power factor correction (PFC) and output voltage controller from a digital level supply voltage; generating a PFC control signal; and generating an LED current control signal; operating a first buffer, coupled to the processor, from a medium level supply voltage, wherein the medium level supply voltage is greater than the digital level supply voltage; receiving the PFC control signal; converting the PFC control signal into a PFC switch control signal to control conductivity of a high voltage PFC switch; and operating a second buffer, coupled to the processor, from the medium level supply voltage; receiving the LED current control signal; and converting the LED current control signal into an LED current control switch signal to control conductivity of a high voltage LED current control switch. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A light emitting diode (LED) lighting system comprising:
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an LED lighting power system, wherein during normal operation of the LED lighting system the LED lighting power system generates a first source voltage relative to a common voltage, wherein the first source voltage is a link voltage, and the LED lighting power system includes; a switching power supply having a power factor correction (PFC) switch, wherein during normal operation of the LED lighting system, the PFC switch of the LED lighting power system operates at a current node voltage less than or equal to 0.1 times the first source voltage relative to the common voltage reference; and an LED current control switch, wherein during normal operation of the LED lighting system, the LED current control switch operates at a current node voltage less than or equal to 0.1 times the first source voltage relative to the common voltage reference; a PFC and output voltage controller coupled to conductivity control nodes of the first and LED drive current switches, wherein during normal operation of the lighting control system, the controller operates from a second source voltage relative to the common voltage and controls conductivity of the PFC switch and the LED current control; and at least one LED coupled to the LED current control switch.
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Specification