Dimmable Offline LED Driver
First Claim
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1. A dimmable LED driver apparatus:
- an input interface coupled to a power source and dimmer, the input interface receives an input voltage from the power source and dimmer;
a sensor coupled to the power source and dimmer, the sensor detects a first voltage on the input voltage and generates a sensed voltage signal representative of a voltage drop on the input voltage caused by a dimmer;
a regulator and control block coupled to receive the sensed voltage signal, the regulator and control block generates an LED driver signal based at least in part on the sensed voltage signal regulator and control block; and
an LED output interface on which the LED driver signal is provided to an LED array.
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Abstract
Embodiments of the present invention provide a system and method for controlling the amplitude of a current from a diode bridge into an EMI filter and LED array. Due to the manner in which certain dimmers (i.e., leading edge dimmers) operate, there is a delay on its output in transmitting a voltage when the voltage crosses zero.
8 Citations
20 Claims
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1. A dimmable LED driver apparatus:
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an input interface coupled to a power source and dimmer, the input interface receives an input voltage from the power source and dimmer; a sensor coupled to the power source and dimmer, the sensor detects a first voltage on the input voltage and generates a sensed voltage signal representative of a voltage drop on the input voltage caused by a dimmer; a regulator and control block coupled to receive the sensed voltage signal, the regulator and control block generates an LED driver signal based at least in part on the sensed voltage signal regulator and control block; and an LED output interface on which the LED driver signal is provided to an LED array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13)
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8. A dimmable LED driver apparatus:
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an input interface coupled to a power source and dimmer, the input interface receives an input alternating current signal from the power source and dimmer; a diode bridge coupled to receive the input voltage, the diode bridge converts the input alternating current signal into a direct current signal; a sensor coupled to receive the direct current signal, the sensor detects a first voltage on the direct current signal and generates a sensed voltage signal representative of a voltage drop on the direct current signal caused by a dimmer; a regulator and control block coupled to receive the sensed voltage signal, the regulator and control block generates an LED driver signal based at least in part on the sensed voltage signal regulator and control block; and an LED output interface on which the LED driver signal is provided to an LED array.
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14. A method of generating an LED driver signal representative of an offline dimming operation, the method comprising:
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receiving an input signal from a power source and dimmer, the input having a voltage drop caused by a dimming operation; sensing the voltage drop on the input signal and generating a sensed voltage signal; generating a regulated LED driver signal based at least in part on the sensed voltage signal and at least one characteristic of an LED array; and providing the regulated LED driver signal to the LED array. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification