CPC H02M 3/1588 (2013.01) [H02M 3/1557 (2021.05)] | 7 Claims |
1. A DC-DC converter comprising:
a first inductor connected between an input power supply and a first terminal of a coupling capacitor;
a first switching element connected between the first terminal of the coupling capacitor and a ground;
a second inductor connected between a second terminal of the coupling capacitor and the ground;
a second switching element connected between the second terminal of the coupling capacitor and an output terminal;
a drive circuit that drives the second switching element;
a drive voltage supply circuit that supplies power to the drive circuit;
a drive voltage switching circuit that switches a drive voltage of the drive circuit, wherein
the drive voltage switching circuit switches a connection so that the drive circuit supplies power with an output voltage or a voltage higher than the output voltage in response to the output voltage being higher than the drive voltage, and
the drive voltage switching circuit switches a connection so as to supply power to the drive circuit from the drive voltage in response to the output voltage being lower than the drive voltage;
an AD converter that detects the output voltage, and converts the output voltage into a digital value;
a subtractor that outputs a difference between the digital value and an output target value;
a filter calculation circuit that calculates an operation value based on the difference; and
a PWM signal generation circuit that generates a PWM signal corresponding to the operation value, wherein
the drive circuit outputs a voltage from the drive voltage switching circuit to the second switching element to drive the second switching element based on the PWM signal.
|