POWER CONVERSION DEVICE
1 Assignment
0 Petitions
Accused Products
Abstract
A power conversion device includes an inverter for converting DC power to AC power to supply the AC power to a load, a converter for converting AC power from an AC power supply to DC power to supply the DC power to the inverter, a DC voltage converter for converting a voltage value of power stored in a storage battery to supply DC power from the storage battery to the inverter when power supply by the AC power supply is abnormal, and a filter which includes a reactor and a capacitor and removes harmonics generated by the inverter. The inverter includes a three-level circuit constituted of an arm and an AC switch.
51 Citations
28 Claims
-
1-10. -10. (canceled)
-
11. A power conversion device comprising:
-
a converter including a multi-level circuit configured to be capable of conversion between a DC voltage and an AC voltage varying between at least three voltage values, and converting DC power to AC power to supply the AC power to a load; a filter including a reactor and a capacitor and removing harmonics generated by said converter; a DC power supply generating DC power; a DC positive bus and a DC negative bus for transmitting said DC power to said converter; and first and second capacitors connected in series between said DC positive bus and said DC negative bus, said multi-level circuit including; first and second semiconductor switching elements connected in series between said DC positive bus and said DC negative bus; first and second free-wheeling diodes connected in anti-parallel to said first and second semiconductor switching elements, respectively; and an AC switch connected between a neutral point of said first and second capacitors and a connection point of said first and second semiconductor switching elements. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A power conversion device comprising:
-
a first converter including a first multi-level circuit configured to be capable of conversion between a DC voltage and an AC voltage varying between at least three voltage values, and converting DC power to AC power to supply the AC power to a load; a filter including a reactor and a capacitor and removing harmonics generated by said first converter; a second converter converting AC power from an AC power supply to DC power; a DC power supply generating DC power; a DC positive bus and a DC negative bus for transmitting DC power generated at said second converter and said DC power supply to said first converter; and first and second capacitors connected in series between said DC positive bus and said DC negative bus, said first multi-level circuit including; first and second semiconductor switching elements connected in series between said DC positive bus and said DC negative bus; first and second diodes connected in anti-parallel to said first and second semiconductor switching elements, respectively; and an AC switch connected between a neutral point of said first and second capacitors and a connection point of said first and second semiconductor switching elements. - View Dependent Claims (17, 18, 19, 20, 21)
-
-
22. A power conversion device comprising:
-
a first converter including a first multi-level circuit configured to be capable of conversion between a DC voltage and an AC voltage varying between at least three voltage values, and converting DC power to AC power to supply the AC power to a load; a filter including a reactor and a capacitor and removing harmonics generated by said first converter; a second converter converting AC power from an AC power supply to DC power; a third converter converting a voltage value of power stored in a power storage device to generate DC power when power supply by said AC power supply is abnormal; a DC positive bus and a DC negative bus for transmitting DC power generated at said second and third converters to said first converter; and first and second capacitors connected in series between said DC positive bus and said DC negative bus, said first multi-level circuit including; first and second semiconductor switching elements connected in series between said DC positive bus and said DC negative bus; first and second diodes connected in anti-parallel to said first and second semiconductor switching elements, respectively; and an AC switch connected between a neutral point of said first and second capacitors and a connection point of said first and second semiconductor switching elements. - View Dependent Claims (23, 24, 25, 26, 27, 28)
-
Specification