Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system
Reexamination Certificate
2011-03-08
2011-03-08
Cosimano, Edward R (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Mechanical measurement system
C340S588000, C340S653000, C340S679000, C374S102000, C374S152000, C702S182000
Reexamination Certificate
active
07904254
ABSTRACT:
For applications in a facility where a power conversion apparatus is frequently started and stopped, a power conversion apparatus and a power cycle longevity estimation method are provided which improve an ease of use of the facility. The power conversion apparatus comprises power conversion circuits to supply ac power of variable voltage and variable frequency, a detection circuit to detect a temperature of the power semiconductor in the power conversion circuits, and a computation device to calculate a power cycle longevity of the power semiconductor based on a maximum temperature rise detected by the detection circuit.
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Hiraga Masahiro
Hirota Masayuki
Ibori Satoshi
Kamezawa Tomoya
Mao Jiangming
Antonelli, Terry Stout & Kraus, LLP.
Cosimano Edward R
Hitachi Industrial Equipment Systems Co. Ltd.
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