Patent ID: 8411396
Filing Date: 2013-04-02
Classification: H02H

Abstract:
1. An alternating current-to-direct current (AC-to-DC) power supply comprising: a circuit segment comprising a first capacitor and a second capacitor connected in series to receive a rectified AC voltage over the circuit segment; a transformer having a first coil and a second coil, the first coil connected in parallel to the circuit segment, the second coil to provide a stepped-down voltage from the rectified AC voltage, the stepped-down voltage rectified and filtered to provide a DC output voltage of the AC-to-DC power supply; a metal oxide varistor (MOV) connected in parallel to the first capacitor; a voltage sensor to detect a DC voltage over the MOV and the first capacitor; and, a circuit to remove power in response to the voltage sensor detecting the DC voltage over the MOV and the first capacitor being greater than a threshold DC voltage for a length of time greater than a threshold length of time.