HEATING MEDIUM HEATING APPARATUS AND VEHICLE AIR CONDITIONER PROVIDED WITH SAME
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United States of America Patent
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Issued Date -
Feb 5, 2015
app pub date -
Mar 26, 2013
filing date -
Apr 16, 2012
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Abandoned
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Abstract
The disclosure provides a heating medium heating apparatus by which it is possible to directly detect a temperature of a semiconductor switching element such as an IGBT, and to perform high-reliability overheating protection control, while suppressing the number of installations of the temperature sensor, and provides a vehicle air conditioner provided with the heating medium heating apparatus. In the heating medium heating apparatus, at least two PTC heaters are provided, the energization of the PTC heaters is respectively ON/OFF-controlled by a plurality of circuits, each containing a semiconductor switching element (34), and the amount of heating is adjusted. Overheating protection temperature sensors (58 and 59) are respectively installed between two pairs of adjacent semiconductor switching elements (34) of a plurality of the semiconductor switching elements (34). An overheating protection control is performed on each semiconductor switching element (34) based on the detected temperature from each of the temperature sensors (58 and 59), and based on a first threshold value (TH1) when any one of the circuits is turned ON, and a second threshold value (TH2) when both circuits are turned ON.
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