Advanced smooth transition switch
September 11, 2022. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3655992 3694633 3772602 Automatic process controller with bumpless operation Electric controller system with bumpless transfer On-line switching between two control parameters Control method and apparatus with reset windup prevention Control mode switching circuit Bumpless switching of valve drive in a turbine control system Bumpless feedback switching apparatus for use in a servo system InventorsApplicationNo. 10241124 filed on 09/11/2002US Classes:307/112, SWITCHING SYSTEMS307/139, Switch actuation318/609, "Reset" systems (P.I.)700/41, Proportional-Integral (P-I)318/610, With rate (P. I. D.) (e.g., reset windup prevention)318/566Maneuver, force, or load-limitingExaminersPrimary: Sircus, BrianAssistant: Kaplan, Hal I. Attorney, Agent or FirmInternational ClassesH01H 9/54G05B 11/42 G05B 13/02 AbstractA bi-directional smooth transition switch with bumpless transfer is disclosed. It is composed of two feedback loops, each with feedback and forward-loop compensators. During loop operation, one feedback loop is active, while the other is inactive. The smooth transition switch operates in the following manner. The switch output is measured. Next, an error signal is formed as the difference between the forward-loop compensator output and the switch output, which is fed to the input of a high gain feedback compensator. The output of the feedback compensator is a feedback signal. When no switching occurs, the feedback signal remains zero in the active loop, and the output signal of the inactive loop will track the output signal of the active loop. When the switchover occurs, the inactive loop will replace the original active loop and provide smooth transition switch's output. | |
