Voice coil motor saturation detection
A method includes monitoring an amount of power of a power supply being used by a voice-coil motor (VMC) during a seek operation, detecting that the amount of power has crossed a threshold during the seek operation, and modifying a subsequent seek operation in response to detecting that the amount of power has crossed the threshold.
1. A method comprising:
monitoring an amount of power of a power supply being used by a voice-coil motor (VCM) during a seek operation, wherein the monitoring the amount of power of the power supply includes monitoring a percentage of power being used during the seek operation;
detecting that the amount of power has crossed a threshold during the seek operation; and
modifying a subsequent seek operation in response to detecting that the amount of power has crossed the threshold.
2. The method of claim 1 , wherein the modifying the subsequent seek operation reduces the risk of a saturation event during the subsequent seek operation.
3. The method of claim 1 , wherein the percentage of power is determined by comparing a percentage of power supply on-time as a function of a total duty cycle.
4. The method of claim 1 , wherein the percentage of power is determined by comparing a number of clock cycles the power supply is on versus a number of clock cycles the power supply is off.
5. The method of claim 1 , wherein the modifying the subsequent seek operation includes modifying parameters of a servo control system.
6. The method of claim 5 , wherein the parameters include a gain or scaler used by the servo control system.
7. A data storage device comprising:
a voice coil motor (VCM) assembly; and
a power supply electrically coupled to the VCM assembly to direct current to the VCM assembly, the power supply including circuitry configured to monitor an amount of power being used during a seek operation, to detect that the amount of power has crossed a threshold during the seek operation, and to trigger a warning signal in response to the crossed threshold, wherein the threshold is stored in a register of the power supply.
8. The data storage device of claim 7 , further comprising: an integrated circuit configured to receive the warning signal and to recalibrate parameters of a servo control system.
9. The data storage device of claim 7 , wherein the circuitry is configured to monitor the amount of power of the power supply by monitoring a percentage of power being used during the seek operation.
10. The data storage device of claim 9 , wherein the percentage of power is determined by comparing a percentage of power supply on-time as a function of a total duty cycle.
11. The data storage device of claim 9 , wherein the percentage of power is determined by comparing a number of clock cycles the power supply is on versus a number of clock cycles the power supply is off.
12. The data storage device of claim 7 , wherein the power supply includes an amplifier.
13. The data storage device of claim 12 , wherein the amplifier is a pulse-width-modulated amplifier.
14. The data storage device of claim 7 , wherein the circuitry includes a counter to monitor the amount of power being used during the seek operation and includes a comparator to detect that the amount of power has crossed the threshold during the seek operation.
15. An integrated circuit comprising:
an amplifier; and
circuitry configured to:
monitor, via a first counter, an amount of power from the amplifier being used during a seek operation,
detect that the amount of power has crossed a threshold during the seek operation, and
trigger a warning signal in response to the crossed threshold.
16. The integrated circuit of claim 15 , wherein the circuitry includes a comparator communicatively coupled to the first counter to detect that the amount of power has crossed the threshold during the seek operation.
17. The integrated circuit of claim 15 , wherein the circuitry includes a second counter communicatively coupled to the first counter to reset a timer of the first counter.
18. The integrated circuit of claim 15 , wherein the circuitry is configured to monitor the amount of power of the power supply by monitoring a percentage of power being used during the seek operation.
19. The integrated circuit of claim 18 , wherein the percentage of power is determined by comparing a percentage of power supply on-time as a function of a total duty cycle.
20. The integrated circuit of claim 15 , wherein the threshold is stored in a register of the amplifier.