| 摘要 |
Provided is a voltage converter in which switching between step-down conversion and step-up conversion is performed seamlessly, without being affected by a voltage drop of a circuit element, and temperature change and variation of the circuit element. The voltage converter includes a step-down PWM signal generation circuit 8 that detects a difference between an output voltage obtained by subjecting an input voltage to step-down conversion, and a step-down target voltage is detected, and generates a PWM signal for use in the PWM control for a step-down switching element 2 based on the detected difference, and a step-up PWM signal generation circuit 7 that detects a difference between an output voltage obtained by subjecting the input voltage to step-up conversion, and a step-up target voltage, and generates a PWM signal for use in the PWM control for a step-up switching element 3 based on the detected difference, and means 10 for increasing the step-down target voltage, which is a target for the control by the step-down PWM signal generation circuit 8, by a predetermined amount larger than the step-up target voltage, which is a target for the control by the step-up PWM signal generation circuit 7. |
