SCR dimming circuit and method
First Claim
1. A silicon-controlled rectifier (SCR) dimming circuit, comprising:
- a) an SCR element configured to generate a lack-phase AC voltage based on a sinusoidal AC supply;
b) a rectifier bridge configured to generate a lack-phase DC voltage based on said lack-phase AC voltage;
c) a conduction angle generator configured to receive said lack-phase DC voltage from said rectifier bridge, and to generate a controlling signal that represents a conduction angle of said SCR element, a clamping voltage, and an adjustment signal; and
d) a dimming signal generator configured to generate a dimming signal in response to said controlling signal, said clamping voltage, and said adjustment signal, wherein said dimming signal is configured to regulate luminance of a light-emitting diode (LED) load in accordance with said lack-phase DC voltage.
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Abstract
The present invention relates to an SCR dimming circuit and method for regulating the luminance of an LED load. In one embodiment, an SCR dimming circuit can include: an SCR element that generates a lack-phase AC voltage based on a sinusoidal AC supply; a rectifier bridge that generates a lack-phase DC voltage based on the lack-phase AC voltage; a conduction angle generator that receives the lack-phase DC voltage, and generates a controlling signal representative of a conduction angle of the SCR element; and a dimming signal generator that generates a dimming signal to regulate luminance of the LED load, where the dimming signal generator receives the controlling signal, an adjustable signal, and a clamping voltage, an amplitude of a dimming phase angle range is selected by a fixed signal determined by the clamping voltage, and the dimming phase angle range may be shifted by regulating the adjustable signal.
31 Citations
20 Claims
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1. A silicon-controlled rectifier (SCR) dimming circuit, comprising:
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a) an SCR element configured to generate a lack-phase AC voltage based on a sinusoidal AC supply; b) a rectifier bridge configured to generate a lack-phase DC voltage based on said lack-phase AC voltage; c) a conduction angle generator configured to receive said lack-phase DC voltage from said rectifier bridge, and to generate a controlling signal that represents a conduction angle of said SCR element, a clamping voltage, and an adjustment signal; and d) a dimming signal generator configured to generate a dimming signal in response to said controlling signal, said clamping voltage, and said adjustment signal, wherein said dimming signal is configured to regulate luminance of a light-emitting diode (LED) load in accordance with said lack-phase DC voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 20)
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14. A silicon-controlled rectifier (SCR) dimming method, the method comprising:
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a) converting an external sinusoidal AC power supply to a lack-phase AC voltage; b) converting said lack-phase AC voltage to a lack-phase DC voltage; c) converting said lack-phase DC voltage to a controlling signal representing a conduction angle of an SCR element; d) generating a dimming signal in response to said controlling signal, an adjustable signal, and a clamping voltage; and e) selecting an amplitude of a dimming phase angle range using a fixed signal that is determined by said clamping voltage. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification