Patent ID: 8848321
Filing Date: 2014-09-30
Classification: H02M

Abstract:
1. A switched mode power supply comprising: an input to which a mains supply is connectable; an input filter including an input capacitor; a rectifier stage coupled to the input capacitor; a converter stage, and a safety arrangement, the safety arrangement having a detector for detecting a disconnection of the mains supply from the input; and a switchable discharge path including a discharge element, the discharge path being arranged to discharge charge stored in the input capacitor through the discharge element in response to the detector detecting a disconnection of the mains supply from the input, wherein the path is switchably connected to a node located between the rectifier stage and the power factor correction stage, the path includes a part of the power factor correction stage, the discharge element is a capacitor located on an output side of the power factor correction stage and different from the input capacitor, the power factor correction stage comprises a switch which is adapted to be cyclically switched, and the path is configured so as to charge the capacitor upon cyclic switching of the switch.