A power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.

A power supply for an LED lighting unit. The power supply comprises two power converters, either of which may provide the power to be drawn by components of the LED lighting unit. In particular, a controller of the power supply controls which power converter converts a mains power supply to a power level for a connected LED lighting unit. The two power converters are designed to be efficient when providing different power levels.

The invention relates to an isolated resonant primary side switched converter (100), comprising a galvanic isolation stage (105), an auxiliary winding (L51-c) on the primary side (101) of the isolation stage (105) which is magnetically coupled to at least one secondary side winding (L51-b, L51-d) of the isolation stage (105), wherein the auxiliary winding (L51-c) is configured to detect a feedback signal as to a secondary side voltage, and a control unit (107) configured to sample the feedback signal, in each or every n.sub.th switching cycle, during a sampling period in which a current is flowing on the secondary side (103) of the isolation stage (105), and to process the sampled signal for a feedback control of the secondary side voltage by controlling the switching operation of a primary side switch (M40, M41).

The invention relates to an isolated resonant primary side switched converter (100), comprising a galvanic isolation stage (105), an auxiliary winding (L51-c) on the primary side (101) of the isolation stage (105) which is magnetically coupled to at least one secondary side winding (L51-b, L51-d) of the isolation stage (105), wherein the auxiliary winding (L51-c) is configured to detect a feedback signal as to a secondary side voltage, and a control unit (107) configured to sample the feedback signal, in each or every n.sub.th switching cycle, during a sampling period in which a current is flowing on the secondary side (103) of the isolation stage (105), and to process the sampled signal for a feedback control of the secondary side voltage by controlling the switching operation of a primary side switch (M40, M41).

According to some embodiments, there is provided a power supply system including a converter configured to generate an output signal based on a rectified input signal for driving a light source, an output correction circuit coupled to an output of the converter and configured to measure a ripple in the output signal and to generate a correction signal to dynamically control a DC-level of the output signal of the converter based on the measured ripple and a reference signal corresponding to a desired DC-level of the output signal.

The invention relates to a method (100) for operating an isolated primary side switched converter (300) for providing a voltage supply to an LED load (401), wherein the converter comprises a galvanic isolation stage (301), the method comprising the steps of: detecting (101) a feedback signal at a primary side of the galvanic isolation stage (301), wherein the feedback signal corresponds to a secondary side voltage, determining (103) an LED supply voltage based on the feedback signal, calculating (105) a threshold value based on a constant reference voltage and an adjustment factor, wherein the adjustment factor is a dynamic factor whose absolute value increases with increasing LED current, and interrupting (107) the voltage supply to the LED load (401) if the determined LED supply voltage exceeds the threshold value.

The invention relates to a method (100) for operating an isolated primary side switched converter (300) for providing a voltage supply to an LED load (401), wherein the converter comprises a galvanic isolation stage (301), the method comprising the steps of: detecting (101) a feedback signal at a primary side of the galvanic isolation stage (301), wherein the feedback signal corresponds to a secondary side voltage, determining (103) an LED supply voltage based on the feedback signal, calculating (105) a threshold value based on a constant reference voltage and an adjustment factor, wherein the adjustment factor is a dynamic factor whose absolute value increases with increasing LED current, and interrupting (107) the voltage supply to the LED load (401) if the determined LED supply voltage exceeds the threshold value.

An apparatus for powering a light-emitting diode (LED) is provided including: a circuit board having an input portion, a power portion, a protection portion, and an output portion; the input portion of the circuit board including an alternating current line and a neutral current line, where the alternating current received across the alternating current line and neutral line supply two distinct, alternative paths, where each of the two distinct alternative paths include a combination of capacitors, inductors, and rectifiers to mitigate signal noise; the power portion of the circuit configured to receive power from the input portion of the circuit along the two distinct, alternative paths, to regulate the current received from the two distinct, alternative paths, and to provide power to an LED driver; and the protection portion of the circuit may be configured to mitigate voltage surges and to regulate the voltage supplied to the LED driver.

An apparatus for powering a light-emitting diode (LED) is provided including: a circuit board having an input portion, a power portion, a protection portion, and an output portion; the input portion of the circuit board including an alternating current line and a neutral current line, where the alternating current received across the alternating current line and neutral line supply two distinct, alternative paths, where each of the two distinct alternative paths include a combination of capacitors, inductors, and rectifiers to mitigate signal noise; the power portion of the circuit configured to receive power from the input portion of the circuit along the two distinct, alternative paths, to regulate the current received from the two distinct, alternative paths, and to provide power to an LED driver; and the protection portion of the circuit may be configured to mitigate voltage surges and to regulate the voltage supplied to the LED driver.

Systems and methods are provided to transmit a data encoded power signal to addressable devices. A data signal includes address and command data that varies between logical states. A controller provides a low loss rectified power signal. The controller further provides data within the power signal by forming a positive polarity rectified power waveform corresponding to data in a first state and a negative polarity rectified waveform signal corresponding to data in a second state using substantially loss-less circuitry.