An electrical supply apparatus is provided. The apparatus has an input for connecting the electrical supply apparatus to a power supply system, an output for connecting the electrical supply apparatus to a load, a rectifier for rectifying the input voltage into a rectified input voltage, and a PFC module for smoothing the rectified input voltage. The PFC module also has an active power factor correction device for shaping a time-dependent supply current, such that a time-dependent input current into the PFC module is matched to a time-dependent current waveform signal. A control module is provided for generating the current waveform signal. The control module generates the current waveform signal during the operation of the electrical supply apparatus independently of the input voltage and temporally synchronizes the current waveform signal with the input voltage or a derivative of the input voltage.