Inverter apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsNaomi Goto, Makoto Yoshida, Norio Yoshida, Susumu Yamano
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Abstract
In an inverter apparatus for converting a direct current to an intermittent current by a converter configured by parallel-connected plural pairs of serially-coupled switching elements, resistance loads are connected across output terminals of the converter and a positive terminal or a negative terminal of a direct current source, and a direct current output can be supplied to the resistance loads from the inverter apparatus by controlling the converter at a low frequency.
Claims17
An inverter apparatus comprising:
- a plurality of switching element pairs which include serially-coupled upper switching and lower switching elements, wherein each upper switching element is connected to a positive side of a direct current source, and each lower switching element is connected to a negative side of said direct current source,
- a plurality of switching output terminals connected to junctions between said upper switching elements and lower switching elements,
- a power source output terminal connected to one of the positive side and the negative side of said direct current source, and
- control means for controlling operations of said upper switching elements and said lower switching elements so as to operate in at least a first mode and a second mode, wherein:
- the first mode supplies an alternating current to a motor connected across said plurality of switching output terminals, and
- the second mode supplies a direct current through a resistance load connected across said power source output terminal and one of said plurality of switching output terminals.
An inverter apparatus comprising:
- a plurality of switching element pairs which include serially-coupled upper switching and lower switching elements, wherein each upper switching element is connected to a positive side of a direct current source, and each lower switching element is connected to a negative side of said direct current source,
- a plurality of switching output terminals for connecting the junctions of said upper switching elements and said lower switching elements to at least one of a plurality of loads and a motor,
- control means for controlling operations of said upper switching elements and said lower switching elements for supplying an alternating current to the motor connected across said plurality of switching output terminals, and
- switching means for selectively connecting the junctions of said upper switching elements and said lower switching elements to at least one of the plurality of loads and the motor,
- said switching means being controlled by said control means so that selective connecting of the junctions is performed while a current does not pass through said switching means.
An inverter apparatus, comprising:
- a plurality of switching elements coupled to a direct current source,
- a plurality of output terminals coupled to the switching elements,
- a power source output terminal coupled to the switching elements, and
- a control unit for controlling operations of the switching elements so as to operate in at least a first mode and a second mode, wherein:
- the first mode supplies an alternating current across the plurality of output terminals, and
- the second mode supplies a direct current across the power source output terminal and one of the plurality of output terminals.
A method for operating an inverter apparatus, comprising the steps of:
- operating in a first mode which supplies an alternating current to one or more output terminals,
- operating in a second mode which supplies a direct current across a power source output terminal and the one or more output terminals, and
- switching the output terminals between one or more loads and a motor.
Dependencies are inferred from the claim text.