Method for reducing thermal stress of a power semiconductor switch, an electrical converter unit and an elevator

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United States of America

PATENT NO 11993479
SERIAL NO

17672150

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Abstract

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An electrical converter unit and a method for reducing thermal stress of a power semiconductor switch, such as an IGBT, of an electrical converter unit, the electrical converter unit comprising at least a gate control circuit wherein the electrical converter unit controls an electrical motor. The method comprises determining load and estimating required motor current based on the determined load and/or a predetermined speed profile. The electrical converter unit has at least a first operating state and a second operating state. The second operating state is used if predetermined criteria is fulfilled, the predetermined criteria relating to at least one of the following: estimated required current, measured motor speed, temperature of the power semiconductor switch and/or electrical converter unit, temperature model of the power semiconductor switch and/or electrical converter unit. In the second operating state a lower switching frequency of the power semiconductor switch is used than in the first operating state, and in the second operating state a higher switching speed of the power semiconductor switch is used than in the first operating state.

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Patent Owner(s)

Patent OwnerAddress
KONE CORPORATION00330 HELSINKI

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kauppinen, Tuukka Helsinki, FI 23 125
Paakkinen, Mikko Helsinki, FI 16 377
Stolt, Lauri Helsinki, FI 40 190

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