Abstract: An electrical circuit for voltage transformation, the electrical circuit being suitable for power factor correction, enables a good power factor correction to be achieved with a high efficiency of between 80% and 95% in the MHz frequency region. To this end, few components suitable for high frequencies (capacitors, inductances, diodes and high frequency switches) are used. The diodes are, for example, Schottky diodes with SiC as the diode material. The high frequency switch includes a powerful MOS transistor.

Abstract: A circuit (1) used for power factor correction, corresponds to a known circuit that includes a high-frequency frequency source (15) for generating a high-frequency voltage (Uf) for a pump capacitor (14). The high-frequency voltage source (15) has two on/off switches (151, 152) connected in series that generate, at an electric connection point (153), a square wave voltage (U1) that varies between these two switches with a frequency (f) of at least 1 megahertz. The voltage source further includes a smoothing device (150) for generating from the square wave voltage a smoothed voltage (Uf) for the pump capacitor, whereby the smoothed voltage varies with a frequency (f) of at least 1 megahertz.

Abstract: A circuit (1) used for power factor correction, corresponds to a known circuit that includes a high-frequency frequency source (15) for generating a high-frequency voltage (Uf) for a pump capacitor (14). The high-frequency voltage source (15) has two on/off switches (151, 152) connected in series that generate, at an electric connection point (153), a square wave voltage (Ul) that varies between these two switches with a frequency (f) of at least 1 megahertz. The voltage source further includes a smoothing device (150) for generating from the square wave voltage a smoothed voltage (Uf) for the pump capacitor, whereby the smoothed voltage varies with a frequency (f) of at least 1 megahertz.