Method of controlling DC/DC converter, method of controlling DC/DC converter apparatus, and method of controlling driving operation of electric vehicle

A method of controlling a DC/DC converter apparatus disposed between a first power device and a second power device for energizing at least one switching device with given duty ratios, wherein the DC/DC converter apparatus includes a DC/DC converter and a controller for energizing said at least one switching device, comprising the steps of:

• setting, as operation modes, at least two of a primary voltage control mode for controlling a primary voltage of the DC/DC converter which is associated with the first power device, a secondary voltage control mode for controlling a secondary voltage of the DC/DC converter which is associated with the second power device, and a current limiting mode for controlling the primary voltage or the secondary voltage in order to prevent a current which flows between the first power device and the second power device through the DC/DC converter from exceeding a threshold value;
• when switching between said at least two operation modes, making a duty ratio in the operation mode before being switched and a duty ratio in the operation mode after being switched, continuous with respect to each other,
• setting the duty ratios in the respective operation modes according to a feedback control process including an integral process, with the controller;
• setting an integral term of the feedback control process in each of the operation modes, with the controller;
• and
• when switching between the operation modes, setting the integral term in the operation mode after being switched in order to substantially equalize the duty ratio in the operation mode before being switched and the duty ratio in the operation mode after being switched.