Method for thermal protection of frequency converter and a...

Details Method for thermal protection of frequency converter and a... Method for thermal protection of frequency converter and a...

2007-11-27

2010-06-01

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Frequency conversion without intermediate conversion to d.c.

By semiconductor converter

C363S050000, C363S165000, C361S093800

Reexamination Certificate

active

07729148

ABSTRACT:
A method for thermal protection of a frequency converter and a frequency converter includes means for controlling the output current of the frequency converter. The method includes the steps of determining predetermined data points which define a thermal current limit for a semiconductor component of the frequency converter at specific temperatures at plural switching frequencies, and determining predetermined data points which define a thermal current limit for the semiconductor component at specific temperatures at a zero converter output frequency. The method also includes determining the highest allowable thermal current as a function of a measured temperature, a determined switching frequency, and a determined output frequency based on the defined data points, and limiting the output current of the frequency converter to the determined highest allowable thermal current.

REFERENCES:
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patent: 5923135 (1999-07-01), Takeda
patent: 7035064 (2006-04-01), Schimanek et al.
patent: 2005/0071090 (2005-03-01), Katou
patent: 0 961 379 (1999-12-01), None
patent: 07-255166 (1995-10-01), None
patent: 2000-228882 (2000-08-01), None
European Search Report dated May 8, 2007.

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