Patent ID: 8107261

Claim:
A powering unit, comprising: a transformer; a full bridge circuit, wherein a primary winding of the transformer is electrically connected to a direct current voltage input via the full bridge circuit; a first secondary winding electrically connected to an output circuit for supplying an output direct current voltage via: a first bridge-type rectifier circuit, an output choke coil, and an output capacitor; a first discharge circuit comprising a diode, a capacitor and a resistor; a second secondary winding electrically connected to the output circuit via: a second bridge-type rectifier circuit, the output choke coil, and the output capacitor; a second discharge circuit comprising at least a diode and a resistor, wherein the second secondary winding, the second bridge-type rectifier circuit and the second discharge circuit supply a part of the output direct current voltage to the output circuit via the output choke coil and the output capacitor.