A voltage conversion device, comprising:
- a voltage conversion circuit that includes an upper arm switching element, a lower arm switching element connected in series with the upper arm switching element, an upper arm diode connected in parallel with the upper arm switching element in a reverse direction, a lower arm diode connected in parallel with the lower arm switching element in the reverse direction, and a reactor connected between the upper arm switching element and the lower arm switching element and that is placed between a low voltage-system power line connected with a power storage device and a high voltage-system power line connected with an electric load to perform voltage conversion;
- a low voltage-system capacitor provided on the low voltage-system power line;
- a high voltage-system capacitor provided on the high voltage-system power line;
- a discharge element configured to discharge an electric charge of the high voltage-system capacitor;
- a low voltage-system voltage detector configured to detect a low voltage-system voltage that is a voltage of the low voltage-system capacitor;
- a high voltage-system voltage detector configured to detect a high voltage-system voltage that is a voltage of the high voltage-system capacitor;
- a power storage voltage detector configured to detect a power storage voltage that is a voltage of the power storage device;
- a relay that is provided on the low voltage-system power line;
- and
- a control device configured to use a low voltage-system voltage correction map or a low voltage-system voltage correction equation to correct the low voltage-system voltage detected by the low voltage-system voltage detector and to use a high voltage-system voltage correction map or a high voltage-system voltage correction equation to correct the high voltage-system voltage detected by the high voltage-system voltage detector, wherein
- when the relay is off, the control device performs zero point adjustment of the low voltage-system voltage detected by the low voltage-system voltage detector;
- and performs zero point adjustment of the high voltage-system voltage detected by the high voltage-system voltage detector,
- when the relay is on and the low voltage-system power line has no electric power consumption, the control device performs output adjustment of the low voltage-system voltage detected by the low voltage-system voltage detector, based on the power storage voltage detected by the power storage voltage detector;
- and creates the low voltage-system voltage correction map or the low voltage-system voltage correction equation, based on results of the zero point adjustment and the output adjustment of the low voltage-system voltage, and
- when the relay is on, the low voltage-system power line has no electric power consumption, and the voltage conversion circuit does not perform voltage conversion, the control device estimates a forward voltage of the upper arm diode;
- performs output adjustment of the high voltage-system voltage detected by the high voltage-system voltage detector, based on a voltage calculated by subtracting the forward voltage from the power storage voltage detected by the power storage voltage detector or based on a voltage calculated by subtracting the forward voltage from a corrected voltage, which is obtained by correcting the low voltage-system voltage detected by the low voltage-system voltage detector;
- and creates the high voltage-system voltage correction map or the high voltage-system voltage correction equation, based on results of the zero point adjustment and the output adjustment of the high voltage-system voltage.