Trw Lucasvarity Electric Steering Limited

Lucas Industries Public Limited Company

David Michael Penketh

An electrical circuit is disclosed having a drive stage and a control stage suitable, for example, for operating an electric motor in an electrical power assisted steering system. The circuit comprises a drive stage ( ) comprising at least a first conducting means and a control stage ( ) comprising a second conducting means, the first conducting means comprising one or more conductive tracks or links ( ) adapted to define an electrical circuit with an input terminal ( ) extending from an end portion of at least one track for connection to a source of electrical current, the second conducting means ( ) comprising a printed circuit board ( ) defining tracks adapted to carry current to/from one or more control devices and supporting at least one track connected to a surface mounted de-coupling capacitor ( ) supported by the printed circuit board ( ), and in which a portion of the track of the first conducting means ( ) is so constructed and arranged as to provide an electrical connection between the capacitor ( ) and the terminal ( ).

Electrical circuits

In an electric power assisted steering system a power stage ( ) is provided comprising at least a first conducting means ( ), and a control stage ( ) is provided comprising a second separate conducting means ( ) adapted to carry one or more electrical components of a control circuit. Each conducting means comprising one or more conductive tracks or links ( ) for carrying current to and/or from components of the electric power assisted steering system.

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Staffordshire, United Kingdom

David Michael Penketh