Converter wherein a piezoelectric transformer input signal is fr

Details Converter wherein a piezoelectric transformer input signal is fr Converter wherein a piezoelectric transformer input signal is fr

1996-08-05

1998-04-14

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, H01L 4108

Patent

active

057396221

ABSTRACT:
In a converter or inverter comprising a switching circuit (23) for switching a direct current input signal into an alternating current switched signal, a piezoelectric transformer (25) for driving a load (27) with a converter output signal, and an FM modulator (43-47) for detecting the converter output signal to produce a rectangular signal for adjusting a switched frequency of the switched signal, a duty ratio adjuster (49) is supplied with the direct current input signal to control the rectangular signal for adjustment of a duty ratio of the switched signal. Preferably, a filter (29) filters the switched signal for the piezoelectric transformer. The converter is given a high efficiency by use of a rectifier on producing the converter output signal. Furthermore, the switching circuit may comprise first (31) and second (33) switching elements, which may be used as an active clamp circuit to linearize a feed forward characteristic of the duty ratio.

REFERENCES:
patent: 3657579 (1972-04-01), Kramer
patent: 4054936 (1977-10-01), Ansai et al.
patent: 5118982 (1992-06-01), Inoue et al.
patent: 5329200 (1994-07-01), Zaitsu
patent: 5341061 (1994-08-01), Zaitsu
patent: 5389852 (1995-02-01), Toda
patent: 5394048 (1995-02-01), Yamashita et al.
patent: 5548189 (1996-08-01), Williams

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