Device for compensating for ripples of output voltage of PFC converter and battery charging device for electric vehicle using same

摘要

A device for compensating ripples in the output voltage of a PFC converter and a battery charging device for an electric vehicle are disclosed. The disclosed device for compensating the ripples included in the output voltage of a PFC converter includes: a first switching element having one end connected with an output terminal that is not connected with a ground from among two output terminals forming an output end of the PFC converter; a second switching element having one end connected with the other end of the first switching element and having the other end connected with a ground; a compensation inductor having one end connected with the other end of the first switching element and with one end of the second switching element; and a compensation capacitor having one end connected with the other end of the compensation inductor and having the other end connected with a ground.

主权项

1. A device for compensating ripples included in an output voltage of a PFC converter equipped on a battery charging device for an electric vehicle, the device comprising:
a first switching element having a first end and a second end, the first end of the first switching element being connected with an output terminal that is not connected with a ground from among two output terminals forming an output end of the PFC converter; a second switching element having a first end and a second end, the first end of the second switching element being connected with the second end of the first switching element and the second end of the second switching element being connected with a ground; a compensation inductor having a first end and a second end, the first end of the compensation inductor being connected with the second end of the first switching element and with the first end of the second switching element; a compensation capacitor having a first end and a second end, the first end of the compensation capacitor being connected with the second end of the compensation inductor and the second end of the compensation capacitor being connected with a ground; and a control part for controlling an on/off state of the first switching element and an on/off state of the second switching element by using a first voltage and a second voltage, the first voltage measured at an output end of the PFC converter, the second voltage measured at both the first and second ends of the compensation capacitor; wherein the control part comprises:
a ripple extraction part configured to extract a ripple voltage included in the first voltage;an amplifying part configured to amplify the extracted ripple voltage;a summing part configured to generate a command voltage by summing the amplified ripple voltage with a reference voltage for the second voltage;a PI control part configured to generate a PI control value by using the command voltage and the second voltage; anda PWM control part configured to generate a PWM control value by using the PI control value.