Smart phase lock loop

• US 7,446,498 B2
• Filed: 09/22/2006
• Issued: 11/04/2008
• Est. Priority Date: 09/22/2006
• Status: Expired due to Fees

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Cheng, Louis, Ma, Ming
• Primary Examiner(s): Ro; Bentsu
• Application Number:
  US11/525,172
• Publication Number:
  US 20080074071A1
• Time in Patent Office: 774 Days
• Field of Search: 318/138, 318/254, 318/439, 318606-610, 318720-724, 318/700, 318/400.04, 318/400.12, 318/400.14, 318/400.38, 388/906, 388/911
• 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;

wherein said step of obtaining the 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.

2. 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; and

wherein said step of obtaining the calculated signal comprises processing said error signal with a proportional integral controller.

3. The control method as recited in claim 2, 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.

4. 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 wherein said feedback system obtains the 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.

5. 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 wherein said feedback system obtains the calculated signal by processing said error signal with a proportional integral controller.

6. The apparatus according to claim 5, 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.

7. 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;

wherein said feedback systems;

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

obtains the 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.