Phase change assisted heat sink
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United States of America Patent
Stats
-
Jul 9, 2002
Issued Date -
N/A
app pub date -
Mar 29, 2001
filing date -
Nov 22, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an electric vehicle, the traction motor is driven from a battery by way of a controllable electric power switcher. In operation of the switcher, the power losses of the switches depends upon the power being handled; during acceleration the power is high, and at constant speed on level ground the power is small. Thus, the power 'dissipated' by the switches varies with time. A cooler transfers heat from the switcher. During acceleration, the cooler may not be sufficient to limit the instantaneous switch temperature. A phase-change heat 'sink' coupled to the switches absorbs heat from the switches during hard acceleration, and returns the heat to the cooler under more constant-speed conditions.
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