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AssigneeCaterpillar Inc.
InventorsZeljko R. Jankovic, Srevidhya Devi, Likhita Ravuri, Jyothiraditya Ramaswamy, Ahmed Khalil, Jackson Wai, James Thorne
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This disclosure describes techniques that address the unequal loss distribution between switches in two H bridge legs of two-level PSFB and DAB converters, where one leg reaches its temperature limit sooner than the other leg due to imbalanced losses. The techniques involve dynamically controlling the switching states of power switches in both legs simultaneously in order to maintain a consistent equivalent phase shift angle between those legs at the given operating point while enabling each leg to dynamically alternate between leading and lagging positions. The dynamic switching state transitions may be seamless, so as not to introduce any transients into the rest of the circuit. By implementing this approach, the techniques achieve a balanced loss distribution between the two legs, thereby facilitating higher power density operation.
A two-level DC-DC converter comprising:
A method of operating a two-level DC-DC converter having a primary side full bridge circuit and a secondary side power stage circuit, the primary side full bridge circuit including a first leg having a first electronic switch and a second electronic switch and a second leg having a third electronic switch and a fourth electronic switch, the method comprising:
A control circuit for a two-level DC-DC converter, the two-level DC-DC converter including a primary side full bridge circuit having a first leg having a first electronic switch and a second electronic switch, and a second leg having a third electronic switch and a fourth electronic switch, wherein the primary side full bridge circuit is configured to generate a first voltage, and wherein configurations of the first electronic switch, the second electronic switch, the third electronic switch, and the fourth electronic switch define an operating cycle pattern having an active positive state, an active negative state, a first zero state, a second zero state, a third zero state, and a fourth zero state over one operating cycle for the primary side full bridge circuit, the two-level DC-DC converter further including a secondary side power stage circuit including a second plurality of electronic components, the secondary side power stage circuit configured to generate a second voltage, a transformer coupled between the primary side full bridge circuit and the secondary side power stage circuit, the control circuit comprising:
Dependencies are inferred from the claim text.