Overload and Current Sensing for Circuit Boards
Original Publication Date: 1978-Apr-01
Included in the Prior Art Database: 2005-Feb-20
Fig. 1 shows a large circuit board 2 that carries a representative smaller circuit board 3 which has semiconductor chips and other components (not shown) for a logic or storage device. Power is transmitted from board 2 to card 3 by representative conductive tabs 4 and 5. Tabs 4 and 5 supply electrical power to separate networks on board 3, and they are used as control points in the power distribution network. Each tab carries an integrated circuit chip with a Hall effect circuit that senses the current flowing through the tab as a function of the associated magnetic field. If the current rises to a fault value, a module 6 signals components on board 2 or 3 to interrupt the current.