Lightech Electronic Industries Ltd.

Fulham Company Limited

Zhanqi Du

Peter W Shackle

The present invention relates to providing an improved dimming driver circuitry, system and a method thereof. The dimming driver circuitry is configured to enable dimming intensity of light generated by one or more light sources, the dimming driver circuitry being connected to a dimmer that provides to it an alternating current (AC) signal. The dimming driver circuitry may in some examples not include a processing unit. Additionally or alternatively, the dimming driver circuitry may in some examples apply amplitude modulation to the output current provided to the one or more light sources. In some of these examples, the dimming driver circuitry may begin to apply at substantially the same time pulse width modulation and amplitude modulation to the output current provided to the one or more light sources. Additionally or alternatively, the dimming driver circuitry may in some examples include at least one linear dimming control pin connected to at least one capacitor and/or resistor configured to fine-tune capacitance and/or resistance.

Phase controlled dimming LED driver system and method thereof

Methods and apparatus are described that can provide improved power factor correction and total harmonic distortion, efficiency and/or direct feedback of load current variations to a power source inverter. In one example, a power supply, for example, a ballast, can have an input circuit, an output circuit and an inverter circuit coupled between the input circuit and the output circuit. A current feedback circuit is coupled between the output circuit and the inverter circuit and configured to feed current back to the inverter circuit through a transformer stage separate from the inverter as a function of a current level in the output circuit.

Electronic ballasts with high-frequency-current blocking component or positive current feedback

The present invention relates to providing an improved phase controlled dimming LED driver circuitry, system and a method thereof, which is configured to enable dimming intensity of light generated by a light source, said phase controlled dimming driver circuitry being connected to a phase control dimmer that provides to it a regulated alternating current (AC) signal, wherein said phase controlled dimming driver circuitry does not include a microprocessor and pulse width modulates its output current, provided to said light source, at a frequency unrelated to the AC signal frequency. Further, the phase controlled dimming driver circuitry applies amplitude modulation (AM) and pulse width modulation (PWM) substantially simultaneously to the output current provided to the light source.

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Baldwin Park, CA, United States of America

Zhanqi Du