Patent ID: 7280331
Filing Date: 2007-10-09
Classification: B23K,H02M

Abstract:
1. A power connect device adapted to receive ac line voltage and provide ac load voltage to a load device, including: a connect panel adapted to receive at least two of first, second, and third input power conductors that provide the ac line voltage to the connect panel, the ac line voltage having a first nominal line voltage level or a second nominal line voltage level depending on a source of the ac line voltage; a transformer circuit in communication with the connect panel and adapted to produce a first ac load voltage at a first nominal load voltage level, the transformer circuit including: a high voltage relay with first, second, and third high voltage relay contacts, wherein the first, second, and third high voltage relay contacts are normally open, wherein the first high voltage relay contact is in communication with the first high voltage secondary winding and adapted to open and close a first high voltage load circuit providing the first ac load voltage from the first high voltage secondary winding to the load device, wherein the second high voltage relay contact is in communication with the second high voltage secondary winding and adapted to open and close a second high voltage load circuit providing the first ac load voltage from the second high voltage secondary winding to the load device, wherein the third high voltage relay contact is in communication with the third high voltage secondary winding and adapted to open and close a third high voltage load circuit providing the first ac load voltage from the third high voltage secondary winding to the load device; a rectifier in communication with the transformer circuit and adapted to receive the second ac load voltage and produce a dc load voltage at a nominal dc voltage level; and a voltage protection circuit in communication with the rectifier and the high voltage relay, wherein the voltage protection circuit is adapted to receive the dc load voltage from the rectifier, wherein the voltage protection circuit determines if a present nominal dc voltage level for the dc load voltage is-within a predetermined range and disables the high voltage relay until the voltage protection circuit determines the present nominal dc voltage level is within the predetermined range for a predetermined time.