Method and apparatus for determining a target light intensity from a phase-control signal

摘要: A dimmable ballast circuit for a compact fluorescent lamp controls the intensity of tube in response to phase-control voltage received from dimmer switch. The comprises phase-control-to-DC converter that receives voltage, which is characterized by duty cycle defining target tube, and generates DC representative voltage. Changes are below threshold amount filtered out circuit, while intentional changes reflected level thereby tube.