Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Reexamination Certificate
2005-09-26
2009-06-02
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
C361S139000, C361S153000
Reexamination Certificate
active
07542262
ABSTRACT:
The present invention refers to an apparatus for driving an electromagnetic load. The apparatus comprises a power stage comprising at least one first and one second transistor half-bridge and the electromagnetic load is arranged between the first and the second half-bridge. The apparatus comprises a first and a second device suitable for driving in linear modality respectively the first and the second half-bridge and another device suitable for driving in pulse width modulation modality the first half-bridge, first switch means suitable for connecting the first half-bridge to the first device or to the other device in response to a control signal, second switch means suitable for connecting the second half-bridge to the second device in response to the control signal. The apparatus has an input signal and comprises a further device suitable for connecting the second half-bridge to a first reference voltage and to a second reference voltage, with said first reference voltage greater than said second reference voltage, when said first half-bridge is connected to the other device suitable for driving it in pulse width modulation modality.
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European Search Report dated Feb. 22, 2005 for European Application No. 04425713.
Bongini Stephen
Fleit Gibbons Gutman Bongini & Bianco P.L.
Jackson Stephen W
Jorgenson Lisa K.
STMicroelectronics s.r.l.
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