Method and apparatus for generating a control power delivered to

Details Method and apparatus for generating a control power delivered to Method and apparatus for generating a control power delivered to

1985-07-19

1987-06-02

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363129, H02P 1326

Patent

active

046708316

ABSTRACT:
A microprocessor determines the zero cross-over times and direction of the phase voltages of the AC power line; a multiplexer has three parallel inputs which are respectively connected to the three phase conductors of the line and an output delivering a voltage formed by successive portions of the phase voltages; a flip-flop sensitive to the change of sign is connected to the output of the multiplexer; and EXCLUSIVE OR gate has an input connected to the output of the flip-flop and an other input to an output of the processor; and a NAND gate has an input connected to the output of the EXCLUSIVE OR gate and another input which receives a signal formed of a succession of square waves forming enabling windows.

REFERENCES:
patent: 4204267 (1980-05-01), Kalinichenko
patent: 4347562 (1982-08-01), Galloway
patent: 4399395 (1983-08-01), Espelage
patent: 4453122 (1984-06-01), Johnson et al.
patent: 4490780 (1984-12-01), Nondahl
patent: 4586121 (1986-04-01), Gilliam
patent: 4599685 (1986-07-01), Hombu et al.

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