Patent ID: 7443648
Filing Date: 2008-10-28
Classification: H02M,H03K

Abstract:
1. A driver, comprising: a battery terminal and a ground terminal for connection to a voltage battery output and a ground battery output, respectively; an output terminal for driving a coil; an energise FET having a source, a gate and a drain; a control FET having a source, a gate and a drain; and a freewheel FET having a source, a gate and a drain, wherein the energise FET is connected with source and drain between the output terminal and the ground terminal, and the control FET and freewheel FET are connected in series between the battery terminal and the output terminal, the sources and drains of the control and freewheel FETs being arranged reversely so that current flowing through the control and freewheel FETs in series flows from source to drain in one of the control and freewheel FETs and from drain to source in the other.