Systems and methods for self-adaptive current control

A controller for controlling a dual-active-bridge direct current to direct current (DC-DC) converter that comprises a transformer, a first H-bridge connected to a primary winding of the transformer, and a second H-bridge connected to a secondary winding of the transformer, the controller comprising:

• a voltage controller configured to determine a reference current based on a reference voltage and a DC voltage output from the second H-bridge;
• a current controller configured to determine an outer phase-shift angle based on the reference current and a DC current output from the second H-bridge, wherein the outer phase-shift angle is a phase shift between a voltage on the primary winding and the voltage on the secondary winding;
• an inner phase-shift angle determination circuit configured to determine a first inner phase-shift angle which is a zero-voltage time of a first voltage on the primary winding and a second inner phase-shift angle which is a zero-voltage time of the second voltage on the secondary winding based on a current of the transformer measured by a current sensor;
• and
• a pulse width modulation (PWM) generator configured to generate signals to control switch devices on the first H-bridge and the second H-bridge based on the outer phase-shift angle, the first inner phase-shift angle, and the second inner phase-shift angle.

A method for controlling a dual-active-bridge direct current to direct current (DC-DC) converter that comprises a transformer, a first H-bridge connected to a primary winding of the transformer, and a second H-bridge connected to a secondary winding of the transformer, the method comprising:

• determining a reference current based on a reference voltage and a DC voltage output from the second H-bridge;
• determining an outer phase-shift angle based on the reference current and a DC current output from the second H-bridge, wherein the outer phase-shift angle is a phase shift between a voltage on the primary winding and the voltage on the secondary winding;
• determining a first inner phase-shift angle which is a zero-voltage time of a first voltage on the primary winding and a second inner phase-shift angle which is a zero-voltage time of a second voltage on the secondary winding based on a current of the transformer measured by a current sensor;
• and
• generating signals to control switch devices on the first H-bridge and the second H-bridge based on the outer phase-shift angle, the first inner phase-shift angle, and the second phase-shift angle.