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US 2011/0215648 A1Published application
Uninterrupted power supply unit
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMasaki YAMADA, Akihiko IWATA, Yoshihiro HATAKEYAMA
Life of this patent
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Abstract
An uninterrupted power supply unit is provided with a straightforward switch connected between a power source and a load to supply or interrupt a power to a system. The combination of the outputs from two kinds of single phase inverters enables compensating for a variation in the system voltage in the normal condition and to supply a predetermined voltage to the load after decreasing in the system voltage and opening of a straight forward switch.
Claims14
1-15. (canceled)
A power supply apparatus comprising:
- a straightforward switch connected in series between a power source and a load, and that supplies or interrupts an electric power output from the power source to the load;
- a first single phase inverter or rectifier including alternating current (AC) side terminals and direct current (DC) side terminals connected in parallel with the load, and with its AC side terminals connected to the load;
- a second single phase inverter or rectifier including alternating current (AC) side terminals and direct current (DC) side terminals connected in series with said load, and with its AC side terminals connected to the load;
- and
- a battery connected to the DC side terminals of said first and second single phase inverters or rectifiers;
- wherein at least one of the first or second single phase inverters or rectifiers is connected to the battery through a DC-DC converter, and
- wherein said first and second single phase inverters or rectifiers are connected so as to be connected in series with each other when said straightforward switch is open to thereby each supply their respective electric powers to the load by each supplying their respective output voltages to the load.
4 more elements
Dependencies are inferred from the claim text.