Electric power conversion systems – Phase conversion without intermediate conversion to d.c. – By induction-type converter
Patent
1997-04-30
1998-08-11
Nguyen, Matthew V.
Electric power conversion systems
Phase conversion without intermediate conversion to d.c.
By induction-type converter
H02M 506
Patent
active
057936285
ABSTRACT:
An N-phase power converter uses a ring oscillator to generate a series of switching signals having substantially equally distributed phase relationships with respect to one another. The ring oscillator is formed from an alternating string of inverters and RC networks with the voltage over each capacitor of each RC network provided to a phase comparator. The phase comparators shape a saw-tooth waveform present over each capacitor into a pulse-width-modulated switching signal that drive switches which alternately charge and discharge inductors. One terminal of each inductor is coupled to common node at which the converter output voltage is provided. A feedback unit generates a feedback signal is used to vary the pulse width of the switching signals.
REFERENCES:
patent: 4010463 (1977-03-01), Kay
patent: 5187654 (1993-02-01), Felippe
patent: 5694094 (1997-12-01), Meuth et al.
Hewlett--Packard Company
Nguyen Matthew V.
Plettner David A.
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