Voltage conversion device, vehicle using voltage conversion device, and control method for voltage conversion device

A voltage conversion device that is connected to a power supply device and is configured to increase a voltage input from the power supply device, the voltage conversion device comprising:

• a conversion circuit configured to convert the voltage from the power supply device;
• an input unit configured to input an amount of electric power generated by the power supply device;
• and
• a control unit configured to control the conversion circuit,
• wherein the control unit includes
• an upper-limit current calculating unit configured to calculate an upper-limit current value using a relationship which is determined based on an increase in temperature of the conversion circuit due to operation of the conversion circuit, the upper-limit current value being an upper limit value of a current which is able to be output from the conversion circuit, and
• a lower-limit voltage control unit configured to calculate a lower-limit voltage of the conversion circuit based on the amount of electric power generated by the power supply device and the upper-limit current value and to perform control such that a voltage on an output side of the conversion circuit is higher than the lower-limit voltage.