Circuit arrangement for producing an A.C. voltage for driving a

Details Circuit arrangement for producing an A.C. voltage for driving a Circuit arrangement for producing an A.C. voltage for driving a

1996-12-02

1998-03-03

Hecker, Stuart N.

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

359275, H02M 520, G02F 1153

Patent

active

057242380

ABSTRACT:
A power supply circuit generates an alternating driving voltage for switching a pane or panel between a transparent state and a substantially opaque state. The pane or panel is, for example, a window with a variable transparency in an aircraft cabin divider. The circuit converts a D.C. voltage that is available, for example, from the aircraft's on-board power supply, into a positive and negative D.C. voltage. These voltages pass through a push-pull output amplifier that is under the control of a clock signal generator to produce the alternating driving voltage at the output of the push-pull amplifier connected to transparent electrodes of the pane or panel that contains liquid crystals. Status sensors may influence the operation of the clock signal generator and/or of the push-pull amplifier.

REFERENCES:
patent: 4336582 (1982-06-01), Brantley et al.
patent: 4529873 (1985-07-01), Ballmer et al.
patent: 5285371 (1994-02-01), Sanada et al.
patent: 5397888 (1995-03-01), Muramatsu
patent: 5608567 (1997-03-01), Grupp

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