Power converter device

A power converter device comprising:

• a first phase-shift full-bridge circuit comprising a first phase-shift switching circuit and a first synchronous switching circuit;
• a second phase-shift full-bridge circuit coupled in parallel with the first phase-shift full-bridge circuit, wherein the second phase-shift full-bridge circuit comprises a second phase-shift switching circuit and a second synchronous switching circuit, wherein the second phase-shift full-bridge circuit and the first phase-shift full-bridge circuit are configured to receive an input voltage and output an output voltage;
• a detector circuit configured to detect an output current;
• and
• a control circuit configured to control the first phase-shift full-bridge circuit and the second phase-shift full-bridge circuit according to the output current, the input voltage, and the output voltage;
• wherein the control circuit disables the second phase-shift full-bridge circuit when the output current is less than a first predetermined value;
• wherein the control circuit enables the second phase-shift full-bridge circuit when the output current is equal to or greater than the first predetermined value, such that the second phase-shift full-bridge circuit and the first phase-shift full-bridge circuit operate in a same control mode;
• wherein the control circuit controls the second synchronous switching circuit to operate in a traditional mode when the output current is equal to or greater than a second predetermined value and a duty cycle of the second phase-shift switching circuit is equal to or greater than a third predetermined value, wherein the second predetermined value is greater than the first predetermined value, wherein the third predetermined value is associated with the input voltage and the output voltage.