Techniques for synchronous rectification control of DC-DC converters in electrified vehicles

A method, comprising:

• determining, at a controller of an electrified vehicle (EV), the controller including one or more processors, a required output current for a DC-DC converter based on a secondary voltage of a secondary battery system of the EV, the DC-DC converter being configured to convert a primary voltage from a primary battery system of the EV to the secondary voltage for at least one of recharging the secondary battery system of the EV and powering low-voltage components of the EV;
• determining, at the controller, a switching frequency for the DC-DC converter that causes the DC-DC converter to output the required output current;
• determining, at the controller, turn-on and turn-off delays of the DC-DC converter based on the required output current and the switching frequency using one or more look-up tables;
• controlling, by the controller, the DC-DC converter based on the turn-on and turn-off delays;
• determining, at the controller, input current, output current, input voltage, and output voltage of the DC-DC converter;
• determining, at the controller, an efficiency of the DC-DC converter based on the input current, the output current, the input voltage, and the output voltage of the DC-DC converter;
• comparing, at the controller, the efficiency of the DC-DC converter to a maximum efficiency of the DC-DC converter;
• and
• selectively adjusting, at the controller, at least one of the turn-on and turn-off delays of the DC-DC converter based on the comparison to obtain at least one of a modified turn-on delay and a modified turn-off delay.