Driver for inductive load

Details Driver for inductive load Driver for inductive load

2004-04-08

2008-10-28

Leja, Ronald W (Department: 2836)

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Reexamination Certificate

active

07443648

ABSTRACT:
A driver for an inductive load such as a solenoid coil92includes three FETs4,6,8.Two of the FETs are reversely connected between battery and output terminals16, 18,and one of the FETs is connected between output and ground terminals16, 14.A driver circuit10having high and low side control circuitry58,56is formed in a common substrate with two of the FETs4,6.In use, a coil92is connected to the output terminal16,and driven in an energize mode in which current in the coil92is built up as indicated by arrow100,a freewheel mode in which current circulates freely as indicated by arrow102,and then may be switched off. The reversely connected FETs allow both short circuits to be prevented in the energize mode and allow the coil to be rapidly switched off. In spite of the control circuitry being formed in a common substrate with some of the FETs, the arrangement allows the FETs to be properly driven.

REFERENCES:
patent: 4929884 (1990-05-01), Bird et al.
patent: 5420532 (1995-05-01), Teggatz et al.
patent: 5767562 (1998-06-01), Yamashita
patent: 6005763 (1999-12-01), North
patent: 2004/0160725 (2004-08-01), Gu
patent: 2004/0260501 (2004-12-01), Fey et al.
patent: 100 50 287 (2002-05-01), None

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