Driving circuit with continuous dimming function for driving light sources
First Claim
1. A dimming controller for controlling dimming of a light emitting diode (LED) light source, said dimming controller comprising:
- a terminal for receiving a dimming request signal indicative of a first plurality of operations of a power switch, and for receiving a dimming termination signal indicative of a second plurality of operations of said power switch, wherein said power switch transfers power from an AC power source to a bridge rectifier when said power switch is on, and wherein a power converter receives input power from said bridge rectifier and provides output power to said LED light source,wherein said dimming controller adjusts said output power by controlling a control switch in series with said LED light source if said dimming request signal is received and until said dimming termination signal is received, and wherein said first plurality of operations of said power switch comprises a first turn-off operation followed by a first turn-on operation, and wherein said second plurality of operations of said power switch comprises a second turn-off operation followed by a second turn-on operation.
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Accused Products
Abstract
A driving circuit for controlling power of a light source includes a power converter coupled to a power source and the light source, and a dimming controller coupled to the power converter. The power converter can receive power from the power source and provide a regulated power to the light source. The power converter includes a control switch coupled in series with the light source. The dimming controller can monitor a power switch coupled between the power source and the driving circuit, and receive a dimming request signal and a dimming termination signal. The dimming request signal can indicate a first set of operations of the power switch. The dimming termination signal can indicate a second set of operations of the power switch. The dimming controller can continuously adjust the regulated power from the power converter by controlling the control switch if the dimming request signal is received, and can stop adjusting the regulated power from the power converter if the dimming termination signal is received.
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Citations
18 Claims
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1. A dimming controller for controlling dimming of a light emitting diode (LED) light source, said dimming controller comprising:
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a terminal for receiving a dimming request signal indicative of a first plurality of operations of a power switch, and for receiving a dimming termination signal indicative of a second plurality of operations of said power switch, wherein said power switch transfers power from an AC power source to a bridge rectifier when said power switch is on, and wherein a power converter receives input power from said bridge rectifier and provides output power to said LED light source, wherein said dimming controller adjusts said output power by controlling a control switch in series with said LED light source if said dimming request signal is received and until said dimming termination signal is received, and wherein said first plurality of operations of said power switch comprises a first turn-off operation followed by a first turn-on operation, and wherein said second plurality of operations of said power switch comprises a second turn-off operation followed by a second turn-on operation. - View Dependent Claims (2, 3, 4, 5)
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6. A system comprising:
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a power converter coupled to a power source and a light emitting diode (LED) light source and for receiving power from said power source, and for providing output power to said LED light source; and a dimming controller coupled to said power converter and for monitoring a power switch coupled to said power source, and for continuously adjusting said power from said power converter upon detection of a first plurality of operations of said power switch until a second plurality of operations of said power switch are detected, said dimming controller comprising; a clock generator for generating a clock signal upon detection of said first plurality of operations of said power switch; and a counter driven by said clock signal for providing a counter value to adjust said output power from said power converter. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for controlling dimming of a light emitting diode (LED) light source, said method comprising:
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powering said LED light source based on output power from a power converter; receiving a dimming request signal indicative of a first plurality of operations of a power switch coupled between a power source and said power converter; and adjusting said output power from said power converter in response to said dimming request signal until a dimming termination signal indicative of a second plurality of operations of said power switch is received, wherein adjusting said output power further comprises; driving a counter based on a clock signal; generating a dimming signal based on a counter value of said counter; and controlling a control switch coupled in series with said LED light source based on said dimming signal to adjust said output power. - View Dependent Claims (17, 18)
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Specification