The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Date of Patent:
Oct. 28, 2003

Filed:

Jul. 29, 2002
Applicant:
Inventors:

Motohiro Shimizu, Saitama, JP;

Masashi Nakamura, Saitama, JP;

Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 3/335 ;
U.S. Cl.
CPC ...
H02M 3/335 ;
Abstract

An inverter is controlled by feeding back an output voltage waveform for stabilizing the output and circuitry simplification. The output waveform of an inverter is supplied to a CPU to generate a correction of the reference sine waveform signal RS which is then used for producing a desired form of PWM signal. The output waveform is A/D converted by a converter which comprises two modules and before transferred to a processor . The output waveform is received by two channels of each of the modules and . As the input channels are sampled in a sequence, their waveforms are A/D converted at intervals of a time in each sampling period and can thus be improved in the resolution of A/D conversion. Since the modules and are operated at different timings lagged slightly from each other, the resolution can be increased.


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