Patent ID: 8866332

Claim:
A circuit arrangement for power distribution in a motor vehicle, comprising: a first transformer stage; said first transformer stage having a first group of at least three magnetically coupled windings; a second transformer stage; said second transformer stage having a second group of at least three magnetically coupled windings; a first onboard supply; a first connection configured to connect to said first onboard supply; a first converter unit coupling said first connection to a first winding of said first group of at least three magnetically coupled windings, said first converter unit also coupling said first connection to a first winding of said second group of at least three magnetically coupled windings; a second onboard supply; a second connection configured to connect to said second onboard supply; a second converter unit coupling said second connection to a second winding of said first group of at least three magnetically coupled windings, said second converter unit also coupling said second connection to a second winding of said second group of at least three magnetically coupled windings; a second-group voltage transformer connected between said second connection and said second converter unit; a third connection configured to connect externally; a third converter unit configured to selectively couple said third connection to a third winding of said first group of at least three magnetically coupled windings, said third converter unit also configured to selectively couple said third connection to a third winding of said second group of at least three magnetically coupled windings; a third-group voltage transformer connected between said third connection and said third converter unit; and, a first change-over switch configured to controllably connect said third converter unit either to said first connection or alternatively to said third connection.