Importance

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Abstract

A battery charger having an RF storage transformer whose primary winding is connected via a clock to a two-pole input for receiving an AC voltage, and whose secondary winding is connected as a flyback converter to a rectifier with a two-pole output for the battery. The charger has a measurement unit, which detects the input current and voltage and a controller which operates the clock as a function thereof. A method for operating the charger, wherein the controller continually switches the clock on for a first interval and switches it off for a second interval, wherein the first interval ends when the current rises to a value corresponding to the instantaneous value of the voltage times a scaling factor, and the duration of the first and second intervals is sufficiently long that their total duration corresponds to the period of one interval of permissible operating frequencies of the transformer.

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First Claim