Invention Grant
US08390214B2 LED-based lighting power supplies with power factor correction and dimming control 有权
基于LED的照明电源,具有功率因数校正和调光控制

LED-based lighting power supplies with power factor correction and dimming control
Abstract:
A power supply for powering one or more loads includes a boost circuit with power factor correction (PFC) that provides an operating voltage from an electrical power source, and a dimmer detection circuit that determines a dimming level applied to the electrical power source, and generates a pulse width modulated (PWM) signal based upon the dimming level. The power supply also includes one or more current control circuits, each current control circuit being associated with each of the one or more loads, and coupled in series with the operating voltage, its associated load, and a ground of the power supply, so as to control a current through its associated load in response to the PWM signal.
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