Back to results
US 2003/0155896 A1Published application
PWM/linear driver for an electromagnetic load
AssigneeSTMicroelectronics S.r.l.
InventorsGalbiati Ezio, Boscolo Michele
Life of this patent
Estimating the term…
Abstract
The present invention relates a Pulse Width Modulation (PWM)/linear driver for an electromagnetic load by a bridge circuit of the type having a signal input and a signal output and at least two conduction control inputs for driving a voice coil motor in a linear mode and in a pulse width modulation. The bridge circuit is driven by a PWM converter coupled to one of said two control inputs and by a linear amplifier coupled to the other of said two control inputs.
Claims12
A bridge circuit comprising:
- a signal input, a signal output and at least two conduction control inputs for driving a voice coil motor in a linear mode and in a pulse width modulation (PWM) mode, the bridge circuit being driven by a PWM converter coupled to one of said two conduction control inputs and by a linear amplifier coupled to the other of said two conduction control inputs.
A method for driving a bridge circuit comprising:
- providing a bridge circuit of the type having a signal input, a signal output, and at least two conduction control inputs;
- driving a voice coil motor with said bridge circuit in a linear mode and in a pulse width modulation mode;
- and
- simultaneously driving one of said two control inputs in the pulse width modulation mode and driving the other of said two control inputs in the linear mode.
1 more element
Dependencies are inferred from the claim text.