Method for detecting output current of inverter and device...

Details Method for detecting output current of inverter and device... Method for detecting output current of inverter and device...

2007-05-29

2007-05-29

Hirshfeld, Andrew H. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C324S076110

Reexamination Certificate

active

11091317

ABSTRACT:
An inverter output current detection device is provided which can calculate an output current of an inverter easily by using a low-performance calculating device without lowering a calculation accuracy. A current ic′ equivalent to a capacitor current ic is digitally calculated according to a predetermined expression. This expression isin-line-formulae description="In-line Formulae" end="lead"?ic′=V×ω0×C×[cos Wavedata]×K,in-line-formulae description="In-line Formulae" end="tail"?where V is an effective value or average value of an output voltage vo, C is a capacitance of a capacitor C, ω0 is an angular frequency of the output voltage, and K is a value obtained by multiplying a detection ratio for detecting the output voltage vo, a conversion ratio for converting an analog value into a digital value, and a conversion ratio for converting the effective value or average value V into a maximum value.

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