The invention provides a multi-channel independent control circuit of lighting power supply, including a power supply control circuit, a transformer, a main current rectifier circuit, a feedback circuit and a main current output circuit, and also including one or more secondary side units. The secondary side unit includes secondary windings, secondary side rectifier circuit, secondary side output circuit, switching circuit, detector and logic control circuit, the secondary side winding is couple to the primary winding, the secondary side rectifier circuit and the secondary side output circuit are sequentially connected in parallel across the loop of the secondary winding, the detector is disposed in the secondary side output circuit and an output end of the detector is connected to an input end of the switching circuit through the logic control circuit. An output end of the switching circuit is connected to the secondary side output circuit. The invention relates to the multi-channel independent control circuit of lighting power supply, realizing independent and normal operation of multiple lighting apparatus or devices, and improving the flexibility, reliability and safety of the entire lighting system.

Programmable drivers (or power supplies) for solid state light sources are disclosed, on which output regulation is improved to expand the dimming range to 1% and reduce and/or remove flicker. Additional fault conditions are set up to avoid latching, and thus provide for a controllable restart feature. Such drivers include an isolated half bridge resonant converter with an improved control approach designed to regulate very low current though primary side in a feed-forward loop. Such drivers include both digital and analog loops that improve the performance in steady state and/or during transients, particularly for a lighting load, in comparison to a single full digital control.

Drivers (1-7) comprise respective switching circuits (1, 2) for guiding respective current signals during respective time-intervals for the sequential driving of light emitting circuits (91, 92). The respective time-intervals are defined by the fact that amplitudes of a mains signal are in respective ranges during the respective time-intervals. More specifically, there is a bypass switching circuit (5) for guiding a bypass current signal which bypasses all light emitting circuit (91, 92) during an initial time-interval. An adaptation circuit (6, 7) adapts amplitudes of the respective current signals during the respective time-intervals, to reduce a total harmonic distortion. Said adapting may comprise an adaptation in response to information derived from the amplitude of the mains signal, and may comprise shaping the amplitudes of the current signals in response to information derived from the amplitude of the mains signal. Preferably, the shaped amplitudes of the respective current signals will be substantially identical to shapes of the amplitude of the mains signal in the respective ranges. The adaptation circuit (6, 7) may comprise a current source (6) and a definition circuit (7).

The present disclosure provides a driving system for a semiconductor light source and a semiconductor lighting device. The driving system comprises: a transformer, the transformer comprising a first coil (201) and a second coil (202) mutually coupled to each other, the second coil (202) being used for receiving an input voltage; a switching device which is connected in series to the second coil (202) and used for controlling energy storage and energy release of the second coil (202); and an outputting device which is connected in parallel to the second coil (202) and used for supplying power to the semiconductor light source. An induced signal is generated on the first coil of the transformer due to a coupling effect between the first coil and the second coil and is used for controlling the switching-on and switching-off of the switching device.

A device for controlling a plurality of electrical consumers to which a constant control current is applied at control nodes. A transformer to which a regulated and/or constant predetermined frequency current is applied at the input end has at least one first and a second winding at the output end which have a common tap, first and second circuit branches forming first and second control nodes for first and second electrical consumers are associated with the first and second windings respectively. The first and second circuit branches each have a magnetically interacting pair of reactors which are wound in opposite relative directions. The first and second reactors of the pair are connected to the first and second control nodes, respectively, via a rectifier. The reactors that are connected to one of the control nodes are oppositely wound. Reactors pairs are magnetically coupled, in particular having a common reactor core.

A lighting apparatus that may comprise a voltage converter operable to supply a current to at least two LED channels coupled between a high voltage rail and a low voltage rail coupled to the voltage converter output is disclosed. The LED channels may be operated to selectively allow a current to flow through them. The lighting apparatus may also have a control module operable to control the total current from the voltage converter and the current through each of the LED channels. The control module may also be operable to set the respective control signals to maintain a constant total current from the voltage converter while permitting aspects of the light output including, the intensity, color, and color temperature to be set and varied. Additionally, the control module may be operable to synchronize the various control signals, obtain a representative sample of the current through the voltage converter, and operate in different modes.

An LED lighting device includes an auxiliary power supply that supplies power to a control circuit of the LED lighting device that receives an input from a terminal of a light-emitting diode (LED) string of the lighting device that has a substantially lower voltage than the line voltage to which the lighting device is connected. The terminal may be within the LED string, or may be an end of the string. A linear regulator may be operated from the voltage drop across a number of the LEDs in the string so that the energy wasted by the auxiliary power supply is minimized. In other designs, the auxiliary power supply may be intermittently connected in series with the LED string only when needed. The intermittent connection can be used to forward bias a portion of the LED string when the voltage supplied to the LED string is low, increasing overall brightness.

A lighting apparatus that may comprise a voltage converter operable to supply a current to at least two LED channels coupled between a high voltage rail and a low voltage rail coupled to the voltage converter output is disclosed. The LED channels may be operated to selectively allow a current to flow through them. The lighting apparatus may also have a control module operable to control the total current from the voltage converter and the current through each of the LED channels. The control module may also be operable to set the respective control signals to maintain a constant total current from the voltage converter while permitting aspects of the light output including, the intensity, color, and color temperature to be set and varied. Additionally, the control module may be operable to synchronize the various control signals, obtain a representative sample of the current through the voltage converter, and operate in different modes.