Patent ID: 11894776
Assignee: UTAH STATE UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A power converter comprising:
a primary H-bridge comprising semi-conductor switches;
an LCL-Transformer section comprising a first inductor Lr with a first end connected to a first terminal A of the primary H-bridge, a capacitor Cr connected between a second end of the first inductor Lr and a second terminal B of the primary H-bridge, and a second inductor Lg with a first end connected to the second end of the first inductor Lr ;
a transformer with a primary side connected between a second end of the second inductor Lg and the second terminal B of the primary H-bridge;
a secondary H-bridge comprising semi-conductor switches with an input connected to a secondary side of the transformer; and
an output capacitor Cf connected across output terminals of the secondary H-bridge,
wherein the primary H-bridge is fed by a direct current (DC) constant current source and the output terminals of the secondary H-bridge are connected to a load and an output voltage of the secondary H-bridge regulated to maintain a constant DC output voltage, and
wherein the semi-conductor switches of the primary H-bridge are arranged in a leg A and a leg B, the semi-conductor switches of the secondary H-bridge are arranged in a leg D and a leg E and wherein:
the semi-conductor switches of the primary H-bridge are operated with symmetrical phase shift modulation with leg A leading leg B by an angle φAb;
the semi-conductor switches of the secondary H-bridge are operated with symmetrical phase shift modulation with leg D leading leg E by an angle φDE;
an angle between leg A and leg D is angle φAD; and
the output voltage of the secondary H-bridge is maintained at a constant voltage by controlling angle φAB, angle φDE, and angle φAD.