Smart phase lock loop

• US 20080074071A1
• Filed: 09/22/2006
• Published: 03/27/2008
• Est. Priority Date: 09/22/2006
• Status: Active Grant

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Ma, Ming, Cheng, Louis
• Granted Patent: US 7,446,498 B2
• Time in Patent Office: Days
• US Class Current: 318/609
• CPC Class Codes: H02P 6/15 Controlling commutation time
• CPC Class Codes: Y10S 388/906 Proportional-integral system
• CPC Class Codes: Y10S 388/911 Phase locked loop

Abstract

A method and apparatus perform control. A control method according to one embodiment accesses a Hall effect signal; obtains an error signal relating to a system parameter using the Hall effect signal and a reference signal for the system parameter; obtains a calculated signal for the system parameter using the error signal; and utilizes the calculated signal as a new reference signal for the system parameter, for a next iteration of the obtaining steps.

Claims

1. A control method, said method comprising:

accessing a Hall effect signal;

obtaining an error signal relating to a system parameter using said Hall effect signal and a reference signal for said system parameter;

obtaining a calculated signal for said system parameter using said error signal; and

utilizing said calculated signal as a new reference signal for said system parameter, for a next iteration of said obtaining steps.

2. The control method as recited in claim 1, wherein said new reference signal tracks with a fundamental component of said Hall effect signal.

3. The control method as recited in claim 1, wherein said step of obtaining an error signal comprises

performing a Park transformation of said Hall effect signal into a stationary frame to obtain transformed Hall signals, and

cross-multiplying said transformed Hall signals with a sine and a cosine of said reference signal for said system parameter, to obtain said error signal.

4. The control method as recited in claim 1, wherein said step of obtaining an error signal comprises cross-multiplying said Hall effect signal with parameters based on said reference signal, to obtain said error signal.

5. The control method as recited in claim 1, wherein said step of obtaining a calculated signal comprises processing said error signal with a proportional integral controller.

6. The control method as recited in claim 5, wherein said step of obtaining a calculated signal further comprises

integrating the output of said proportional integral controller in time to obtain said calculated signal as an angle, wherein said error signal is an angular speed, and said system parameter is an angle parameter.

7. The control method as recited in claim 1, wherein said system parameter is an angle parameter relating to a rotor position in a motor, and said Hall effect signal relates to a magnetic field in said motor.

8. The control method as recited in claim 1, wherein said accessing step, said obtaining steps, and said utilizing step perform a closed loop control that automatically corrects an error in said new reference signal, when said Hall effect signal is corrupted due to noise or interferences.

9. A control apparatus, said apparatus comprising:

a signal input unit for accessing a Hall effect signal; and

a feedback system for controlling a system parameter, said feedback system controlling said system parameter by

obtaining an error signal relating to said system parameter using said Hall effect signal and a reference signal for said system parameter,

obtaining a calculated signal for said system parameter using said error signal, and

utilizing said calculated signal as a new reference signal for said system parameter, for a next iteration of said obtaining steps.

10. The apparatus according to claim 9, wherein said new reference signal tracks with a fundamental component of said Hall effect signal.

11. The apparatus according to claim 9, wherein said feedback system obtains an error signal by

performing a Park transformation of said Hall effect signal into a stationary frame to obtain transformed Hall signals, and

cross-multiplying said transformed Hall signals with a sine and a cosine of said reference signal for said system parameter, to obtain said error signal.

12. The apparatus according to claim 9, wherein said feedback system obtains an error signal by cross-multiplying said Hall effect signal with parameters based on said reference signal.

13. The apparatus according to claim 9, wherein said feedback system obtains a calculated signal by processing said error signal with a proportional integral controller.

14. The apparatus according to claim 13, wherein said feedback system obtains a calculated signal by integrating the output of said proportional integral controller in time to obtain said calculated signal as an angle, wherein said error signal is an angular speed, and said system parameter is an angle parameter.

15. The apparatus according to claim 9, wherein said system parameter is an angle parameter relating to a rotor position in a motor, and said Hall effect signal relates to a magnetic field in said motor.

16. The apparatus according to claim 9, wherein said feedback system performs a closed loop control that automatically corrects an error in said new reference signal, when said Hall effect signal is corrupted due to noise or interferences.

17. The apparatus according to claim 9, wherein said system parameter is an angle parameter relating to a rotor position in a three phase motor, and said Hall effect signal is a three phase signal relating to a magnetic field in said motor.

18. A control apparatus, said apparatus comprising:

a signal input unit for accessing a positional signal; and

a feedback system for controlling a system parameter, said feedback system controlling said system parameter by

obtaining an error signal relating to said system parameter using said positional signal and a reference signal for said system parameter,

obtaining a calculated signal for said system parameter using said error signal, and

utilizing said calculated signal as a new reference signal for said system parameter, for a next iteration of said obtaining steps.

19. The apparatus according to claim 18, wherein

said system parameter is an angle parameter relating to a rotor position in a motor, and

said positional signal relates to an angular position of said rotor, said positional signal being produced by one of a Hall effect device, a resolver, and a rotary variable differential transformer.

20. The apparatus according to claim 18, wherein said feedback system

obtains an error signal by cross-multiplying said positional signal with parameters based on said reference signal,

obtains a calculated signal by processing said error signal with a proportional integral controller and integrating the output of said proportional integral controller in time to obtain said calculated signal as an angle, wherein said system parameter is an angle parameter, and

performs a closed loop control that automatically corrects an error in said new reference signal, when said positional signal is corrupted due to noise or interferences.