Trapezoidal current control in electronic transformers

An electronic-embedded transformer for a power converter, comprising:

• a primary winding;
• a secondary winding;
• a resonant inductor for use in the power converter, the resonant inductor being embodied as leakage inductance among the primary winding and the secondary winding;
• a capacitance coupling switch bridge of switching devices (Q1), (Q2), (Q3), and (Q4) arranged in a full bridge;
• and
• a controller configured to generate phasing drive control signals that introduce a phase shift between phase legs of the switching devices (Q1), (Q2), (Q3), and (Q4) based on a phase shift coefficient, (k), and a current plateau and zero-voltage stage among the switching devices (Q1), (Q2), (Q3), and (Q4) for trapezoidal current modulation control of the capacitance coupling switch bridge, wherein:
• the capacitance coupling switch bridge comprises a capacitor coupled among the full bridge of switching devices in the capacitance coupling switch bridge;
• and
• the capacitance coupling switch bridge is arranged to couple the capacitor in series with the resonant inductor based on the phasing drive control signals.

A power converter system, comprising:

• a power converter comprising:
• a first bridge of switching devices;
• a second bridge of switching devices;
• and
• an electronic-embedded transformer between the first bridge and the second bridge, the electronic-embedded transformer comprising a capacitor and a capacitance coupling switch bridge of switching devices (Q1), (Q2), (Q3), and (Q4) arranged in a full bridge;
• and
• a controller configured to:
• generate switching control signals for the first bridge of switching devices and the second bridge of switching devices;
• and
• generate phasing drive control signals that introduce a phase shift between phase legs of the switching devices (Q1), (Q2), (Q3), and (Q4) based on a phase shift coefficient, (k), and a current plateau and zero-voltage stage among the switching devices (Q1), (Q2), (Q3), and (Q4) for trapezoidal current modulation control of the capacitance coupling switch bridge, wherein:
• the electronic-embedded transformer further comprises a capacitor coupled among the full bridge of switching devices (Q1), (Q2), (Q3), and (Q4) in the capacitance coupling switch bridge;
• and
• the capacitance coupling switch bridge is arranged to couple the capacitor in series with an inductance of the electronic-embedded transformer based on the phasing drive control signals.