Inverter having constant frequency chopper synchronized to modul

Details Inverter having constant frequency chopper synchronized to modul Inverter having constant frequency chopper synchronized to modul

1976-11-22

1977-09-20

Shoop, William

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363124, 363132, 363138, H02M 700

Patent

active

040500063

ABSTRACT:
A static inverter has a chopper transistor between a unidirectional source and the inverter load current carrying semiconductor switches, time ratio controlling means including a constant frequency oscillator for modulating the chopper at the constant oscillator frequency and for regulating the width of pulses conducted by the chopper as a function of the magnitude of an analog command signal, means for modulating the inverter semiconductor switches at a frequency which is a function of the analog command signal to establish the inverter output frequency, and means for synchronizing the switching of the chopper to the inverter output frequency so that the chopper is reset at the beginning of each half cycle of inverter output frequency.

REFERENCES:
patent: 3781641 (1973-12-01), Rettig
patent: 3848176 (1974-11-01), Etter
patent: 3986100 (1976-10-01), Beierholm et al.
Electronics & Power, "Invertor Techniques for Power Supplies and A.C. Motor Control", J. R. Pashley, June, 1972, pp. 206-209.

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