Patent ID: 7095158

Claim:
An A/D converter with adjustable internal connection, for converting an alternating current source to a direct current source, comprising: a rectifier driver module, adapted for rectifying an input voltage from said alternating current source and converting said input voltage to a corresponding driver voltage; a transformer module, including: a plurality of piezoelectric transformers, each of said plurality of piezoelectric transformers having two input terminals and two output terminals, said two output terminals of said plurality of piezoelectric transformers being connected in parallel to serve as two output terminals of said transformer module; and a control module, adapted for receiving said driver voltage, wherein said control module responsive to said input voltage and thereby adjust a connection between said input terminals of said plurality of piezoelectric transformers; and an output rectifier module, adapted for receiving an output voltage from saidtwo output terminals of said transformer module, and rectifying said output voltage from saidtwo output terminals to output said direct current source.