Filter apparatus for use in an inverter apparatus
AssigneeKabushiki Kaisha Toshiba
InventorsHiroshi Miyazaki, Junichi Takuma, Hidetoshi Kanazawa, Eiji Sato, Toshiyuki Kamimura
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Abstract
A filter apparatus has a current-detecting coil. The coil detects a high-frequency leak current flowing from the phase-windings of a motor to the earth terminal through the closed case of a compressor. A current-canceling circuit generates a current similar in waveform to the high-frequency leak current detected by the coil. The current thus generated cancels out the high-frequency leak current.
Claims10
A filter apparatus for use in an inverter apparatus for supplying drive power to a motor, said filter apparatus comprising:
- a core;
- coils mounted on said core, said coils being adapted to be provided on lines incorporated in the inverter apparatus;
- and
- a current-detecting coil for detecting a leakage current, said current-detecting coil being mounted on said core and having ends adapted to be connected to a circuit board of the inverter apparatus.
The filter apparatus according to 2, further comprising:
- an annular holding member for spacing said current-detecting coil from said coils.
Dependencies are inferred from the claim text.