US 11,906,940 B2
Two-tier feedback control system and related method
Jemm Yue Liang, Sunnyvale, CA (US); Chieh-Yao Chang, Taipei (TW); and Hsi-Sheng Chen, Fremont, CA (US)
Assigned to xMEMS Labs, Inc., Santa Clara, CA (US)
Filed by xMEMS Labs, Inc., Santa Clara, CA (US)
Filed on Mar. 3, 2023, as Appl. No. 18/177,765.
Application 18/177,765 is a continuation in part of application No. 18/048,852, filed on Oct. 23, 2022, granted, now 11,757,360.
Claims priority of provisional application 63/435,214, filed on Dec. 23, 2022.
Claims priority of provisional application 63/269,041, filed on Mar. 8, 2022.
Prior Publication US 2023/0288884 A1, Sep. 14, 2023
Int. Cl. G05B 13/04 (2006.01)
CPC G05B 13/042 (2013.01) 23 Claims
OG exemplary drawing
 
1. A feedback control system, comprising:
a plant, configured to produce an output according to a control signal;
a first summing block, configured to produce a first difference between an input signal and a measured output signal;
a first controller, configured to generate the control signal, such that the first difference decreases to be less than a first threshold or is less than the first threshold;
a second controller, coupled to a memory; and
a second summing block, coupled to the second controller and configured to produce a second difference;
wherein the first controller comprises the memory configured to store a table, and the table contains information of a plurality of transfer functions corresponding to a plurality of operating conditions;
wherein the first controller determines an operating condition under which the plant operates, and chooses to utilize a transfer function corresponding to the operating condition to generate the control signal according to the transfer function and the first differences;
wherein the second controller is configured to update the information contained in the table according to the second difference, such that the second difference decreases to be less than a second threshold or is less than the second threshold.