Device for controlling fast charger to reduce circulating current

A charging device, comprising:

• at least one parallel module being composed of an AC/DC converter module and a DC/DC converter module;
• and
• a control device controlling the at least one parallel module,
• wherein the control device comprises:
• a first PI controller receiving an input related to a voltage;
• a second PI controller receiving an input related to a current;
• a first operator calculating a result value of the first PI controller and a result value of the second PI controller;
• a PSM controller outputting a switch operation signal according to a PSM control based on the result value of the first operator;
• and
• a PFM controller outputting a switch operation signal according to a PFM control based on the result value of the first operator.

A charger control method performed in at least one processor, the method comprising:

• calculating an input related to a voltage by using a difference between a reference voltage and an output voltage;
• calculating an input related to a current by using a difference between a reference current and an output current;
• inputting the input related to the voltage into a first PI controller as well as inputting the input related to the current to a second PI controller;
• calculating a PI control result value by using a result value of the first PI controller and a result value of the second PI controller;
• and
• outputting a PSM control or a switch operation signal according to the PSM control based on the PI control result value.