METHOD AND APPARATUS FOR AN INTELLIGENT LIGHT EMITTING DIODE DRIVER HAVING POWER FACTOR CORRECTION CAPABILITY
First Claim
1. A circuit for controlling a set of light emitting diode strings, comprising:
- a programmable controller having one or more associated detectors, the programmable controller obtains data related to one or more measureable parameters for a set of light emitting diode strings via the associated detectors, determines a drive value based at least in part on the measurable parameters, and generates a control signal based on the drive value;
a power supply system, having power factor correction capability, obtains the control signal as a first input, and an ac waveform voltage as a second input, and generates a drive voltage based at least in part on at least one of the control signal or the ac waveform voltage; and
a programmable variable resistor included in the power supply for setting a set of operating conditions for the input current and voltage control loop that facilitate the power supply in generating the drive voltage.
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Accused Products
Abstract
The present invention relates to circuits and methods for controlling one or more LED strings. The circuit comprises a programmable controller coupled to one or more detectors, wherein the one or more detectors are configured to detect one or more measurable parameters of one or more LEDs or LED drivers. The controller is configured to receive information from the one or more detectors related to the one or more measurable parameters and use that information to determine the desired drive voltage for the LED strings. The controller is associated with a power supply having power factor correction (PFC) capability. The controller provides the power supply with a control signal indicative of the desired drive voltage for one or more LED strings. The power supply also receives ac voltage and current waveforms as inputs and performs power factor correction and rectified waveforms related to the ac waveforms. The power supply generates the desired drive voltage based on the control signal.
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Citations
20 Claims
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1. A circuit for controlling a set of light emitting diode strings, comprising:
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a programmable controller having one or more associated detectors, the programmable controller obtains data related to one or more measureable parameters for a set of light emitting diode strings via the associated detectors, determines a drive value based at least in part on the measurable parameters, and generates a control signal based on the drive value; a power supply system, having power factor correction capability, obtains the control signal as a first input, and an ac waveform voltage as a second input, and generates a drive voltage based at least in part on at least one of the control signal or the ac waveform voltage; and a programmable variable resistor included in the power supply for setting a set of operating conditions for the input current and voltage control loop that facilitate the power supply in generating the drive voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a set of light emitting diode strings, comprising:
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determining at least one characteristic for at least one light emitting diode included in the light emitting diode strings; generating a control signal for a drive voltage for at least one of the light emitting diode strings based at least in part on the characteristics; performing a power factor correction related to ac current and ac voltage waveforms inputs for a power supply; and producing the drive voltage based at least in part on the control signal, and a value of a programmable variable resistor located in an input current and voltage control loop. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A system facilitating control of a set of light emitting diode strings, comprising:
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a programmable controller associated with a set of detectors that measures data including at least one of an ambient temperature, a luminous intensity, or a wavelength of light emitted by at least one of the light emitting diodes in the light emitting diode strings, the controller determines a drive value based at least in part on the data, and generates a control signal based on the drive value; a power supply having power factor correction capability that obtains the control signal as a first input, and an ac waveform voltage as a second input, and generates a drive voltage based at least in part on the ac voltage; and a programmable variable resistor included in the power supply that sets a set of input current and voltage control loop operating conditions that facilitate the power supply in generating the drive voltage, wherein a state machine controls the programmable variable resistor based at least in part on at least one of the following inputs;
a zero crossing signal generated via a zero crossing detector, an input line voltage value obtained via an input voltage controlled input current loop, a discrete error voltage obtained via an operational amplifier, a limit triode region signal obtained via a triode region detector, or an input voltage feedforward correction signal obtained via an input voltage feedforward correction loop.
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Specification