×

AC/DC converter with a piezoelectric transformer

  • US 5,969,954 A
  • Filed: 01/15/1998
  • Issued: 10/19/1999
  • Est. Priority Date: 01/16/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A switching regulator type AC/DC step-down voltage converter for converting a commercial AC power source to a DC power source, comprising an input circuit for converting the AC power source to an input signal to a step-down piezoelectric transformer, and an output circuit for converting the piezoelectric transformer output signal to a substantially DC power supply, wherein said piezoelectric transformer includes an input section and an output section, each being implemented as a plurality of electrodes laminated in a lengthwise direction of said piezoelectric transformer and connected in parallel with each other, and wherein portions between said plurality of electrodes are polarized in the lengthwise direction, whereby said piezoelectric transformer is operable in a longitudinal vibration mode.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×