Patent ID: 8644045
Filing Date: 2014-02-04
Classification: H02M,H05K

Abstract:
1. A voltage conversion device having a DC-DC converter which comprises a reactor which can temporarily accumulate energy using a direct current from a direct current power supply, and a switching element, and which converts, using the energy accumulated in the reactor, direct current power from the direct current power supply to a direct current power of a different voltage value utilizing a switching operation of the switching element and outputs the converted power, a capacitor which is provided at an input side of the DC-DC converter and in parallel with the direct current power supply, and a cooling unit which cools the capacitor with a cooling medium, the voltage conversion device comprising: a cooling medium temperature detecting unit which detects a temperature of the cooling medium for cooling the capacitor; a switching frequency setting unit which sets a switching frequency of the switching element based on both the temperature of the cooling medium for cooling the capacitor and a temperature of the switching element; and a switching controller which controls the switching operation of the switching element by the set switching frequency, to control a voltage conversion ratio of the DC-DC converter, wherein: