Electromagnetic VS transformers can be controlled using phase-cutting leading-edge dimmers. These dimmers "cut" the sinusoidal mains voltage in the negative and positive half wave at an angle in the ascending portion of this sinusoidal half wave. The higher the angle is set at the dimmer controls, the lower the voltage and hence the lamp´s output.
Electronic VS converters can be controlled using phase-cutting trailing-edge dimmers. In this case, a semiconductor ensures the pre-defined descending portion of the sinusoidal half wave is clipped. VS converters of the LiteLine and TopLine series can be operated with either phase-cutting leading-edge or trailing-edge dimmers. Twin Line converters feature a separate potentiometer connection for adjusting lamp brightness.
Working principle of the phase-cutting leading-edge dimmer: Alpha=Ignition angle, I=Current, Lambda=Current flow, U=Voltage
Working principle of the phase-cutting trailing-edge dimmer
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