| 摘要 |
An electrical power supply unit for vehicle comprises: a Main Power Supply 100, a Voltage Converter 40 for converting the output voltage of the Main Power Supply 100 to supply electrical power to a Motor Drive Circuit 30, a Subsidiary Power Supply 50 to be charged by the Voltage Converter 40 and to aid the electrical power supply for the Motor Drive Circuit 30 with its stored electrical power, and an Electrical Power Supply Control Unit 62 to control the converted voltage of the Voltage Converter 40. The Electrical Power Supply Control Unit 62 controls the converted voltage of the Voltage Converter 40 based on the Voltage Converter Temperature Tb and the Subsidiary Power Supply Temperature Ts so that the heat generation condition of the Voltage Converter 40 and the heat generation condition of the Subsidiary Power Supply 50 are balanced. Thereby, the difference between the timing when a Voltage Converter Temperature Tb reaches an overheat prevention starting temperature and the timing when a Subsidiary Power Supply Temperature Ts reaches an overheat prevention starting temperature decreases, and the timing when an overheat prevention starts can be delayed as much as possible.
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