ELECTRONIC BALLAST WITH DIMMING CIRCUIT

摘要

An electronic ballast with dimming circuit including an electronic ballast dimming circuit receiving an analog dimming signal, the electronic ballast dimming circuit including an input dimming circuit (210) operable to receive the analog dimming signal (252) at an analog dimming signal input (212); and an output dimming circuit (220) operably connected to the input dimming circuit (210), the output dimming circuit (220) being operable to receive a fixed frequency signal (222) having a variable duty cycle and to generate an analog dimming control signal (224) in response to the analog dimming signal (252). Output voltage at the analog dimming signal input (212) is a function of the variable duty cycle of the fixed frequency signal (222) when the analog dimming signal (252) is not present at the analog dimming signal input (212).