Inverter loop latch with integrated ac detection reset
AssigneeHoneywell International Inc.
InventorsMark Bokusky, Cory Grabinger
Life of this patent
Estimating the term…
Abstract
A first illustrative embodiment includes an actuator having both a Run state and a Hold state, the actuator including circuitry for detecting power supply abnormalities and causing the Run state to occur following a power supply abnormality. In another illustrative embodiment, the present invention includes an actuator having both a Run state and a Hold state, the actuator including a power detect circuit that keeps the actuator from entering the Hold state when the power supply is below a certain level.
Claims20
An actuator having a Run state and a Hold state, the actuator comprising circuitry for detecting power supply abnormalities, the circuitry for detecting power supply abnormalities being operable to cause the actuator to enter the Run state following a detected power supply abnormality.
An actuator having both a Run state and a Hold state, the actuator comprising an electric motor that begins actuation when a power supply is at or above a first magnitude, the actuator further comprising a power detect circuit that prevents the actuator from entering the Hold state when the power supply is below the first magnitude.
A driver circuit for an actuator, the driver circuit comprising:
- a latching output circuit configured to provide a Run output for a Run state and a Hold output for a Hold state, the latching output circuit providing the Run output during actuation of the actuator and the Hold output after actuation has stopped, the latching output circuit including a latch for controlling whether the Run output or the Hold output is provided;
- and
- a reset circuit coupled to the latching output circuit such that, when power to the driver circuit fails, the latch is reset by the reset circuit to cause the Run output to be provided.
A method of operating an actuator, the method comprising:
- operating the actuator in a Run state during a first period of time;
- while in the Run state, determining that actuation to a desired position has been completed and thereafter placing the actuator in a Hold state;
- and
- determining whether a power supply abnormality has occurred and, if so, operating the actuator in the Run state after the power supply abnormality.
Dependencies are inferred from the claim text.