| CPC H02M 3/33571 (2021.05) [H02M 1/0054 (2021.05); H02M 1/08 (2013.01)] | 20 Claims |
|
1. A DC/DC converter system, comprising:
a DC/DC converter, comprising:
a first switching transistor and a second switching transistor, the first switching transistor and the second switching transistor are connected in series by an intermediate node and are coupled across a direct current (DC) power supply;
a first capacitor coupled to the intermediate node;
a transformer coupled to the first capacitor, the transformer comprising an excitation inductor and a transformer leakage inductor, a primary side of the transformer is connected in parallel to two ends of the first switching transistor using the first capacitor, and a secondary side of the transformer is coupled to a DC load;
a third transistor coupled between a secondary output line of the transformer and the DC load; and
a controller coupled to the DC/DC converter, the controller comprising:
a memory storing instructions; and
at least one processor in communication with the memory, the at least one processor configured, upon execution of the instructions, to perform the following steps:
control the first switching transistor to turn on so the first capacitor forms a first closed circuit with the excitation inductor and the transformer leakage inductor using the first switching transistor, wherein a first current in the excitation inductor increases in a first direction;
when a preset time period expires, control the first switching transistor to turn off so a second switching transistor voltage across the second switching transistor decreases; and
when the second switching transistor voltage across the second switching transistor is a first preset voltage threshold, control the second switching transistor to turn on so a second current passes through the second switching transistor, the first capacitor, the transformer leakage inductor, and the excitation inductor to form a second closed circuit, wherein the DC/DC converter enters a first state, the second current in the excitation inductor increases in a second direction, and the second direction is opposite to the first direction.
|