Hybrid DC-to-AC conversion system and method of operating the same

摘要

A hybrid DC-to-AC conversion system includes a first DC input voltage, a second DC input voltage, a power conversion apparatus, and a comparison unit. The power conversion apparatus is connected in parallel to the first DC input voltage and the second DC input voltage to convert the first DC input voltage or the second DC input voltage into an AC output voltage. The comparison unit receives the AC output voltage and an external reference voltage. The comparison unit outputs a control signal to make the first DC input voltage supply a load when an absolute value of the AC output voltage is less than or equal to the external reference voltage, whereas the comparison unit outputs the control signal to make the second DC input voltage supply the load when the absolute value of the AC output voltage is greater than the external reference voltage.

主权项

1. A hybrid DC-to-AC conversion system comprising:
a first DC input voltage; a second DC input voltage, wherein the second DC input voltage is greater than the first DC input voltage; a power conversion apparatus having a first power switch, a second power switch, a third power switch and a fourth power switch; wherein the first power switch, the second power switch and the third power switch are connected in series to form a first path, and the first path is connected in parallel to the first DC input voltage; the fourth power switch, the second power switch and the third power switch are connected in series to form a second path, and the second path is connected in parallel to the second DC input voltage and configured to convert the first DC input voltage or the second DC input voltage into an AC output voltage to supply a load; and a comparison unit configured to receive the AC output voltage and an external reference voltage, wherein the comparison unit is configured to output a control signal to control the power conversion apparatus converting the first DC input voltage into the AC output voltage when an absolute value of the AC output voltage is less than or equal to the external reference voltage; whereas the comparison unit is configured to output the control signal to control the power conversion apparatus converting the second DC input voltage into the AC output voltage when the absolute value of the AC output voltage is greater than the external reference voltage.