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US 9,178,448 B2Granted
Power conversion device
AssigneeFuji Electric Co., Ltd.
InventorShogo Ogawa
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AssigneeFuji Electric Co., Ltd.
InventorShogo Ogawa
Estimating the term…
A power conversion device for driving a load, including a power conversion device main body configured to receive an input of a power supply voltage and to drive the load, and a brake circuit configured to protect the power conversion device main body from overvoltage applied thereto. The brake circuit includes a Zener diode that becomes conductive when the voltage applied to the power conversion device main body exceeds a predetermined value, to thereby suppress the voltage.
A power conversion device for driving a load, comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
For stopping or slowing an AC motor: by short-circuit or resistive braking
Providing protection against overload without automatic interruption of supply: detecting a fault condition, e.g. short circuit, locked rotor,…
Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load: the fault being an overvoltage
Control or regulation of electric motors, electric generators or dynamo-electric converters
About 7 years 4 months of term left · ends 14 Feb 2034 (estimated)
This application claims the priority of a corresponding Japanese patent application, Serial No. JP PA 2013-007323, filed Jan. 18, 2013, the entire content of which is hereby incorporated by reference.
1. Field of the Invention
The present invention relates to a power conversion device including a protection function with respect to regenerative power from a load.
FIG. 1 is a main portion schematic configuration diagram of a power conversion device according to one embodiment of the invention;
FIG. 2 is a main portion schematic configuration diagram of a power conversion device according to another embodiment of the invention; and
FIG. 3 is a main portion schematic configuration diagram of a power conversion device including a heretofore known general overvoltage protection function (brake circuit).
Hereafter, referring to the drawings, a description will be given of a power conversion device according to embodiments of the invention.
A power conversion device 1 according to the invention is basically configured to include a power conversion device main body (inverter circuit) 2 and a brake circuit 3 connected in parallel to the power conversion device main body 2, in the same way as a heretofore known power conversion device shown in FIG. 3. Consequently, the same reference signs are given to portions the same as those of the heretofore known device, and a description thereof will be omitted.
The power conversion device 1 according to this embodiment is characterized in that a Zener diode 8 is installed between a positive electrode line of a direct current power supply voltage Vin and the gate of a semiconductor switch 3b (the control terminal of a semiconductor switching circuit) in the brake circuit 3, as shown in a main portion schematic configuration diagram in FIG. 1. The Zener diode 8 is formed of, for example, a diode having breakdown voltage characteristics of the same extent as a pre-set maximum limit voltage (protection voltage), which protects the power conversion device main body 2 from a rise in the direct current power supply voltage Vin.