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US 5,633,790 AGranted
DV/DT limiting of inverter output voltage
AssigneeEaton Corporation
InventorsDavid J. Gritter, Jeffrey A. Reichard
Life of this patent
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Abstract
A voltage rise limiting circuit (10) for use in conjunction with an inverter-driven induction motor (14). The circuit (10) includes capacitors (C4, C5, C6) connected in a delta configuration, with each node (64, 66, 68) coupled between an inductor (L7,L8,L9) and an input line of a diode bridge rectifier. The rectifier clamps positive voltage levels, putting trapped energy back into the dc inverter bus.
Claims7
A voltage limiting circuit for use with an inverter-driven induction motor system, said limiting circuit being electrically coupled between said inverter and motor and comprising:
- a plurality of input lines for receiving an ac electrical signal from said inverter;
- a plurality of inductors, at least one said inductor connected on each said input line;
- a rectifier having a plurality of output lines adapted to return dc signals to said inverter;
- and
- a plurality of capacitors connected in a delta configuration between said inductors and said rectifier.
2 more elements
Dependencies are inferred from the claim text.