Portable device with reduced power dissipation

Abstract

The invention relates to a device (1, 14, 17) comprising: a terminal (2) for connection of the device to a power source; a rectifier (3) connected to the terminal; a half-bridge circuit (4) connected to the rectifier in order to generate an a.c. switching voltage, and having a half-bridge point (5); a control circuit (6) for controlling the half-bridge circuit; a power supply (7) for deriving a supply voltage for the control circuit from the switching AC voltage supplierd by the half-bridge circuit, said supply comprising a charging capacitor (10) connected to said half-bridge point; and a load circuit (8) connected to the half-bridge point, wherein the charging capacitor is connected to the half-bridge point through an impedance (13, 16).

Dependencies are inferred from the claim text.