Patent ID: 7218061
Filing Date: 2007-05-15
Classification: H05B,Y02B,Y10S

Abstract:
1. A circuit for producing a control signal for the purpose of dimming at least one lamp, the circuit comprising: a device for receiving an input voltage and a dimming input value, and for providing an output voltage having a modified phase gating angle, wherein the device is operable to modify the phase gating angle in dependence upon the dimming input value; a rectifier circuit for receiving the output voltage from the device and for providing a rectified version of the output voltage; a control output at which a control signal is provided; an amplitude detection device coupled to the rectifier circuit, wherein the amplitude detection device is operable to detect the amplitude of the input voltage and to provide a predeterminable voltage in dependence upon the amplitude of the input voltage; and a comparison device coupled to the rectifier circuit, the amplitude detection device, and the control output, wherein the comparison device is operable to: