ELECTRONIC TRANSFORMER TAP SWITCH
Original Publication Date: 1981-Feb-28
Included in the Prior Art Database: 2004-Apr-02
Xerox Disclosure Journal
A low-voltage transformer 10 has its main secondary winding 11 connected to a bridge rectifier circuit 12 which comprises four diodes 13, 14, 15 and 16. The output of the bridge rectifier supplies a DC voltage across a load 17. The secondary of the transformer is tapped to provide the main secondary winding 11 and a subsidiary secondary winding 18. Thyristors 19 and 20 are connected between the end of the subsidiary secondary winding 18 and the output points of the bridge circuit 12. The thyristors are arranged to be triggered in response to the value of the input voltage to the transformer.