Patent ID: 11881781
Assignee: AUTONETWORKS TECHNOLOGIES, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A voltage conversion device having a voltage conversion unit including a first switching element and a second switching element and configured to perform voltage conversion with one of a first conduction path and a second conduction path that are electrically connected to a power unit as an input side and the other thereof as an output side, a first voltage detection unit configured to detect a first voltage value which is a voltage value of the first conduction path, and a second voltage detection unit configured to detect a second voltage value which is a voltage value of the second conduction path, the voltage conversion unit performing a first operation for stepping up or stepping down an input voltage applied to the second conduction path by an on/off operation of the second switching element and applying an output voltage to the first conduction path, and a second operation for stepping up or stepping down an input voltage applied to the first conduction path by an on/off operation of the first switching element and applying an output voltage to the second conduction path, the voltage conversion device comprising:
a current detection unit configured to detect a current value of the first conduction path;
an internal resistance detection unit configured to detect an internal resistance of the power unit;
a first duty generation unit configured to generate a first duty for approximating the voltage value of the first conduction path to a first target value by a feedback operation based on the voltage value of the first conduction path and the first target value;
a second duty generation unit configured to generate a second duty for approximating the voltage value of the second conduction path to a second target value by a feedback operation based on the voltage value of the second conduction path and the second target value;
a determination unit configured to determine a usage duty, based on the first duty and the second duty; and
a drive unit configured to input a PWM signal that depends on the usage duty determined by the determination unit to one of the first switching element and the second switching element, and to input an inverted signal obtained by inverting the PWM signal to the other switching element,
wherein the determination unit determines the usage duty, based on a larger value or a smaller value from when an inverted duty which is a value obtained by subtracting one of the first duty and the second duty from 100 percent and the other duty are compared, the internal resistance detected by the internal resistance detection unit, and the current value detected by the current detection unit.