Adaptive dimmer detection and control for LED lamp
First Claim
Patent Images
1. A light-emitting diode (LED) lamp, comprising:
- one or more LEDs;
a dimmer control unit configured to identify a type of dimmer switch providing an input voltage from a plurality of identifiable types of dimmer switches including at least a leading edge dimmer and a trailing edge dimmer, determine a detected dimming amount of the input voltage for the identified type of dimmer switch, and generate one or more control signals to control regulated current through the one or more LEDs such that an output light intensity of the one or more LEDs is proportional to the detected dimming amount; and
a power converter configured to receive the control signals and provide regulated current to the one or more LEDs, the power converter configured to adjust the regulated current to the one or more LEDs as indicated by the one or more control signals to achieve the output light intensity proportional to the detected dimming amount.
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Abstract
An LED lamp is provided in which the output light intensity of the LEDs in the LED lamp is adjusted based on the input voltage to the LED lamp. A dimmer control unit detects a type of dimmer switch during a configuration process. Using the detected dimmer type, the dimmer control unit generates control signals appropriate for the detected dimmer type to provide regulated current to the LEDs and to achieve the desired dimming effect. The LED lamp can be a direct replacement of conventional incandescent lamps in typical wiring configurations found in residential and commercial building lighting applications that use conventional dimmer switches.
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Citations
26 Claims
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1. A light-emitting diode (LED) lamp, comprising:
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one or more LEDs; a dimmer control unit configured to identify a type of dimmer switch providing an input voltage from a plurality of identifiable types of dimmer switches including at least a leading edge dimmer and a trailing edge dimmer, determine a detected dimming amount of the input voltage for the identified type of dimmer switch, and generate one or more control signals to control regulated current through the one or more LEDs such that an output light intensity of the one or more LEDs is proportional to the detected dimming amount; and a power converter configured to receive the control signals and provide regulated current to the one or more LEDs, the power converter configured to adjust the regulated current to the one or more LEDs as indicated by the one or more control signals to achieve the output light intensity proportional to the detected dimming amount. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A light-emitting diode (LED) lamp, comprising:
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one or more LEDs; a dimmer type detector configured to receive an input voltage and determine a detected type of dimmer switch; a phase detector configured to receive the input voltage and determine a detected phase angle modulation of the input voltage representative of a detected dimming amount by comparing the input voltage to one or more threshold voltages that are set differently depending on the detected type of dimmer switch; and a dimming controller configured to generate one or more control signals using the detected amount of phase angle modulation to control dimming of the one or more LEDs such that an output light intensity of the one or more LEDs is proportional to the detected dimming amount; and a power converter configured to receive the control signals and provide regulated current to the one or more LEDs, the power converter configured to adjust the regulated current to the one or more LEDs as indicated by the one or more control signals to achieve the output light intensity proportional to the detected dimming amount. - View Dependent Claims (8, 9, 10)
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11. A light-emitting diode (LED) lamp, comprising:
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one or more LEDs; a dimmer control unit configured to determine a type of dimmer switch providing an input voltage, determine a detected dimming amount of the input voltage for the detected type of dimmer switch, and generate one or more control signals to control regulated current through the one or more LEDs such that an output light intensity of the one or more LEDs is proportional to the detected dimming amount, wherein the one or more dimmer control signals comprise a control signal indicative of a peak current for driving the one or more LEDs, wherein the peak current is a function of the detected dimming amount; and a power converter configured to receive the one or more control signals including the control signal indicative of the peak current and provide regulated current to the one or more LEDs, the power converter configured to adjust the regulated current to the one or more LEDs as indicated by the one or more control signals, wherein the power converter drives the one or more LEDs in a constant current mode that limits the regulated current through the converter to the peak current such that the light intensity of the one or more LEDs is proportional to the detected dimming amount.
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12. A light-emitting diode (LED) lamp, comprising:
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one or more LEDs; a dimmer control unit configured to determine a type of dimmer switch providing an input voltage, determine a detected dimming amount of the input voltage for the detected type of dimmer switch, and generate one or more control signals to control regulated current through the one or more LEDs such that an output light intensity of the one or more LEDs is proportional to the detected dimming amount, wherein the dimmer control signals comprise a control signal indicative of a duty cycle for driving the one or more LEDs, wherein the duty cycle is a function of the detected dimming amount; and a power converter configured to receive the one or more control signals including the control signal indicative of the duty cycle and provide regulated current to the one or more LEDs, the power converter configured to adjust the regulated current to the one or more LEDs as indicated by the one or more control signals, wherein the power converter turns the one or more LEDs on during an on-period of the duty cycle and the power converter turns the one or more LEDs off during an off-period of the duty cycle such that an average light intensity of the one or more LEDs is proportional to the detected dimming amount.
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13. A method for dimming an LED lamp, the method comprising:
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receiving a lamp input voltage; performing a first dimmer detection stage to identify a type of dimmer switch outputting the lamp input voltage from a plurality of identifiable types of dimmer switches including at least a leading edge dimmer and a trailing edge dimmer; determining a detecting dimming amount of the lamp input voltage for the detected type of dimmer switch; determining one or more control signals to drive the LED lamp based on the lamp input voltage and the detected dimming amount; and driving the LED lamp based on the one or more control signals such that output light intensity of the LED lamp is proportional to the detected dimming amount. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A method for dimming an LED lamp, the method comprising:
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receiving a lamp input voltage; performing a dimmer detection stage to determine a type of dimmer switch outputting the lamp input voltage; determining a detecting dimming amount of the lamp input voltage for the detected type of dimmer switch; determining a detected phase angle modulation of the lamp input voltage by comparing the lamp input voltage to one or more threshold voltages that are set different depending on the detected type of dimmer switch; determining a detected dimming amount for the detected type of dimmer switch based on a detected phase angle modulation of the lamp input voltage; determining one or more control signals to drive the LED lamp based on the lamp input voltage and the detected dimming amount; and driving the LED lamp based on the one or more control signals such that output light intensity of the LED lamp is proportional to the detected dimming amount. - View Dependent Claims (22, 23, 24)
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25. A method for dimming an LED lamp, the method comprising:
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receiving a lamp input voltage; performing a dimmer detection stage to determine a type of dimmer switch outputting the lamp input voltage; determining a detecting dimming amount of the lamp input voltage for the detected type of dimmer switch; determining a peak current as function of the detected dimming amount; determining one or more control signals to drive the LED lamp based on the lamp input voltage and the detected dimming amount, the one or more control signals including a control signal indicative of the peak current; and driving the LED lamp based on the one or more control signals to operate the LED lamp in a constant current mode that limits current through the LED lamp to the peak current such that the light intensity of the LED lamp is proportional to the detected dimming amount.
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26. A method for dimming an LED lamp, the method comprising:
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receiving a lamp input voltage; performing a dimmer detection stage to determine a type of dimmer switch outputting the lamp input voltage; determining a detecting dimming amount of the lamp input voltage for the detected type of dimmer switch; determining a duty cycle as a function of the detected dimming amount; determining one or more control signals to drive the LED lamp based on the lamp input voltage and the detected dimming amount, the one or more control signals including a control signal indicative of the duty cycle; and driving the LED lamp based on the one or more control signals wherein the LED lamp turns on during an on-period of the duty cycle and the LED lamp turns off during an off-period of the duty cycle such that an average output light intensity of the LED lamp is proportional to the detected dimming amount.
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Specification