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US 6,617,817 B2Granted
Electrical time constant compensation method for switched, voltage-mode driver circuit
AssigneeSTMicroelectronics S.r.l.
InventorJohn P. Hill
Life of this patent
Estimating the term…
Abstract
A power driver for driving a signal on a load using voltage-mode driver. A system processor generates commands indicating a programmed drive signal desired from the voltage-mode driver. A lead compensator determines a compensated command to compensate for an admittance function of the load. The compensated commands are coupled to the voltage-mode driver, such that the voltage-mode driver generates a voltage output based upon the compensated command.
Claims23
A method of driving a voice coil motor (VCM) comprising:
- providing a voltage-mode driver coupled to the power supply and generating a drive signal to the VCM;
- generating commands indicating a programmed voltage output desired from the voltage-mode driver;
- determining at least one lead compensation coefficient compensating for an electrical time delay associated with the (VCM);
- modifying the commands using the at least one time lead compensation coefficient to produce a compensated command;
- supplying the compensated command to the voltage-mode driver;
- and
- generating a voltage output from the voltage-mode driver based upon the compensated command.
4 more elements
A power driver comprising:
- a voltage-mode driver coupled to the power supply voltage and generating a drive signal to a voice coil motor (VCM) load;
- a system processor configured to generate commands indicating a programmed voltage output desired from the voltage-mode driver;
- a compensator that determines a correction factor based on admittance of the load;
- a connection coupling the compensated command to the voltage-mode driver, wherein the voltage-mode driver generates a voltage output based upon the compensated command.
1 more element
A disk drive system comprising:
- a disk having a surface capable of storing data;
- a read/write head configured to read and write data to specified locations of the disk surface;
- a voice coil motor coupled to the read write head and responsive to a drive signal to position the read/write head at the specified locations;
- a voltage-mode driver coupled to receive commands and generate the drive signal to the voice coil motor;
- a system processor configured to generate commands indicating a programmed drive signal desired from the voltage-mode driver;
- a lead compensator that determines a correction factor based on admittance of the load;
- a combination mechanism coupled to the lead compensator and the system processor receive the correction factor and the generated command and generate a compensated command in a feed forward manner using the correction factor;
- a connection coupling the compensated command to the voltage-mode driver, wherein the voltage-mode driver generates a voltage output based upon the compensated command.
5 more elements
Dependencies are inferred from the claim text.