Methods for controlling power consumption and temperature in an LED luminaire are disclosed. The LED luminaire has one or more sets of LED light engines disposed on a printed circuit board (PCB), some or all of which are activated in response to an instruction or set of instructions. The instruction or set of instructions are processed to derive an indication of power consumption for each of the one or more sets of LED light engines. Power allocations for the one or more sets of LED light engines are adjusted to meet targets. This can be done by, e.g., ramping up or down the duty cycle of active sets of LED light engines by a uniform factor until the targets are met. Temperature control methods similarly ramp down the duty cycle of active sets of LED light engines uniformly over time if the measured temperature of the PCB exceeds limits.

A lighting device includes a rectifier circuit, a conversion circuit, a constant current circuit and a control circuit. The conversion circuit includes a first series circuit, a second series circuit and a third series circuit. The conversion circuit is configured to output a DC current by on/off of a switching element being controlled by the control circuit. A high potential-side terminal of the third capacitor is electrically connected to an output terminal. The low potential-side terminal of the third capacitor is electrically connected to an output terminal, via the constant current circuit.

A method and apparatus of adjusting parameter for an electrical device. The method of adjusting parameter for an electrical device, the electrical device comprising a converter, the method including: calculating a performance evaluation parameter of the electrical device, when the converter using a parameter value table for running; adjusting at least one parameter value in the parameter value table of the converter according to an input parameter so as obtain the optimized performance evaluation parameter of the electrical device and use the adjusted parameter value table corresponding to the optimized performance evaluation parameter for running. Therefore, the self adapting parameter in the table will be enable to find the best performance for different input and load conditions and better performance of Harmonics will not limit the operation range.

A method for wirelessly providing power to a LED includes: receiving an AC input voltage having a first frequency via a cable; generating a first rectified voltage at a first node from the AC input voltage, the first node coupled to a first filtering non-electrolytic capacitor; powering a driver with the first rectified voltage; wirelessly transmitting power by driving a first resonant tank with the driver with a driving voltage at a second frequency higher than the first frequency, the driving voltage having a sinusoidal envelope at the first frequency and approximating a square-wave at the second frequency; receiving the wirelessly transmitted power with a second resonant tank; generating a second rectified voltage at second node from a voltage across the second resonant tank, the second node coupled to a second filtering capacitor; generating a DC voltage from the second rectified voltage; and powering the LED with the DC voltage.

A method for wirelessly providing power to a LED includes: receiving an AC input voltage having a first frequency via a cable; generating a first rectified voltage at a first node from the AC input voltage, the first node coupled to a first filtering non-electrolytic capacitor; powering a driver with the first rectified voltage; wirelessly transmitting power by driving a first resonant tank with the driver with a driving voltage at a second frequency higher than the first frequency, the driving voltage having a sinusoidal envelope at the first frequency and approximating a square-wave at the second frequency; receiving the wirelessly transmitted power with a second resonant tank; generating a second rectified voltage at second node from a voltage across the second resonant tank, the second node coupled to a second filtering capacitor; generating a DC voltage from the second rectified voltage; and powering the LED with the DC voltage.

The present invention discloses a lighting installation having an LED lamp (19), normally consisting of a series string of individual LED's (18), which is supplied by a rectifier (20, 200). A control circuit (23, 23 & C1) is interposed between the rectifier and the AC supply which powers the rectifier. Various circuits for filtering, power factor control, multi-phase operation and dimming, for example by phase switching, are disclosed. In particular, the control carried out by the control circuit takes place on the AC side of the rectifier. Also disclosed are the control circuit per se and a method of converting a High Intensity Discharge (HID) lamp installation into a Light Emitting Diode (LED) installation. The control circuit can take the form of an inductor, an inductor and series capacitor, a shunt inductor, a leakage reactance transformer, a constant current transformer, an autotransformer, an isolation transformer or a ferro-resonant transformer.

The present invention discloses a lighting installation having an LED lamp (19), normally consisting of a series string of individual LED's (18), which is supplied by a rectifier (20, 200). A control circuit (23, 23 & C1) is interposed between the rectifier and the AC supply which powers the rectifier. Various circuits for filtering, power factor control, multi-phase operation and dimming, for example by phase switching, are disclosed. In particular, the control carried out by the control circuit takes place on the AC side of the rectifier. Also disclosed are the control circuit per se and a method of converting a High Intensity Discharge (HID) lamp installation into a Light Emitting Diode (LED) installation. The control circuit can take the form of an inductor, an inductor and series capacitor, a shunt inductor, a leakage reactance transformer, a constant current transformer, an autotransformer, an isolation transformer or a ferro-resonant transformer.

Pseudo-digital light-emitting diode (LED) with secondary-side flyback control is described. In one embodiment, a Digital Addressable Lighting Interface (DALI) compatible driver includes a secondary-side controller coupled to a secondary winding of a transformer and coupled to a light-emitting element. The secondary-side controller includes a DALI-compatible interface to receive information. The secondary-side controller communicates a control signal with a primary-side controller via a galvanically-isolated link. The primary-side controller is coupled to a primary winding of the transformer. The DALI-compatible driver modifies a light output of the light-emitting element in response to the information.

Pseudo-digital light-emitting diode (LED) with secondary-side flyback control is described. In one embodiment, a Digital Addressable Lighting Interface (DALI) compatible driver includes a secondary-side controller coupled to a secondary winding of a transformer and coupled to a light-emitting element. The secondary-side controller includes a DALI-compatible interface to receive information. The secondary-side controller communicates a control signal with a primary-side controller via a galvanically-isolated link. The primary-side controller is coupled to a primary winding of the transformer. The DALI-compatible driver modifies a light output of the light-emitting element in response to the information.

A voltage-regulating phase-cut dimmable power supply includes an electromagnetic interference filter circuit, a rectifier circuit, a power conversion circuit, a transformer, a rectifier and filter circuit, a phase-cut dimming signal conversion circuit, a first optocoupler, a dimming signal conversion circuit, a voltage comparison control circuit, a second optocoupler, a pulse width modulation (PWM) control circuit, and a voltage sampling circuit. The electromagnetic interference filter circuit, the rectifier circuit, the power conversion circuit, the transformer and the rectifier and filter circuit are electrically connected in sequence. The phase-cut dimming signal conversion circuit, the first optocoupler, the dimming signal conversion circuit, the voltage comparison control circuit, the second optocoupler and the PWM control circuit are electrically connected in sequence to an output end of the electromagnetic interference filter circuit. The voltage sampling circuit is electrically connected to the voltage comparison control circuit and an output end of the rectifier and filter circuit.