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US 12,706,519 B2Granted
Highly efficient isolated bidirectional DC/AC topologies
AssigneeBoard of Regents, The University of Texas System
InventorsQin Huang, Qingyun Huang
Life of this patent
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Abstract
Method and apparatus include a first stage converter configured to generate a half sine wave, and a second stage converter in electrical communication with the first stage converter and configured to transform the half sine wave into a power signal. The second stage converter may further supply the power signal to an electrical grid. In one example, the second stage converter may include an isolated, unregulated, resonant direct current/alternating current (DC/AC) converter.
Claims19
An apparatus comprising:
- a bidirectional direct current (DC)/alternating current (AC) circuit having a 1.5 stage topology comprising:
- a whole stage converter comprising a half bridge inverter configured to transform a DC voltage to an always positive half sine wave having a first voltage, wherein when operating in a soft switching mode, a switching speed of the half bridge inverter increases without degrading an efficiency of the half bridge inverter;
- and
- a half stage converter in electrical communication with the whole stage converter, the half stage converter-having a fixed-gain, the half stage converter comprising a half bridge inverter configured to transform the always positive half sine wave having the first voltage to an always positive half sine wave having a second voltage that is higher than the first voltage, the half stage converter further comprising an unfolding bridge inverter configured to transform the always positive half sine wave having the second voltage into an AC power signal, and to supply the AC power signal to an electrical grid.
1 more element
An apparatus comprising:
- a bidirectional direct current (DC)/alternating current (AC) circuit having a 1.5 stage topology comprising:
- a whole stage converter comprising a half bridge inverter configured to transform a DC voltage to an always positive half sine wave having a first voltage, wherein when operating in a soft switching mode, a switching speed of the half bridge inverter increases without degrading an efficiency of the half bridge inverter;
- and
- an isolated, unregulated, resonant DC/AC half stage converter in electrical communication with the whole stage converter, the isolated, unregulated, resonant DC/AC half stage converter having a fixed-gain, the isolated, unregulated, resonant DC/AC half stage converter comprising a half bridge inverter configured to transform the always positive half sine wave having the first voltage into an always positive half sine wave having a second voltage that is higher than the first voltage, the isolated, unregulated, resonant DC/AC half stage converter further comprising an unfolding bridge inverter configured to transform the always positive half sine wave having the second voltage into a full sine wave.
1 more element
A method of manufacturing a circuit, the method comprising:
- providing a whole stage converter of a bidirectional direct current (DC)/alternating current (AC) circuit having a 1.5 stage topology, the whole stage converter comprising a half bridge inverter configured to transform a DC voltage to an always positive half sine wave having a first voltage, wherein when operating in a soft switching mode, a switching speed of the half bridge inverter increases without degrading an efficiency of the half bridge inverter;
- and
- providing a half stage converter of the bidirectional DC/AC circuit having the 1.5 stage topology, the half stage converter in electrical communication with the whole stage converter, the half stage converter having a fixed-gain, the half stage converter comprising a half bridge inverter configured to transform the always positive half sine wave having the first voltage to an always positive half sine wave having a second voltage that is higher than the first voltage, the half stage converter further comprising an unfolding bridge inverter configured to transform the always positive half sine wave having the second voltage into an AC power signal, and to supply the AC power signal to an electrical grid.
Dependencies are inferred from the claim text.