Honeywell International Inc.

Petr Senfluk

Ondrej Ficner

Petr Gross

Frantisek Krivanek

A circuit that receives AC power for rectification and analog DC control signals for processing. Two voltages may be noted. A first voltage may be between a supply ground and an internal device ground of a rectifier. A second voltage may be between a terminal of an input control signal source and the internal device ground. To get a control signal value, one may need a differential of those two voltages that can be accomplished with an operational amplifier configured as differential amplifier. A range of an input control signal may be from zero to a particular magnitude of voltage. A reasonably priced operational amplifier might not have an ability provide an output to zero. However, a linearized transistor output stage, having an output that can go to zero, may be connected to an output of the operational amplifier so as to effectively provide an output that goes to zero.

Modulating input device having a full wave rectifier

An HVAC actuator that includes a motor to assist in driving an HVAC component between a first end stop and a second end stop, a return spring configured to provide a bias force toward the second end stop, and a controller operatively coupled to the motor. The controller may store a predetermined zero position that corresponds to the position of the HVAC component that results when the HVAC component is allowed to come to rest against the second end stop under the influence of the bias force of the return spring while the motor is interrupted from controlling the position and speed of the HVAC component. The controller may be configured to remove drive power to the motor before the HVAC componentreaches the predetermined zero position, allowing the return spring to gently park the HVAC component on the send end stop.

Method and apparatus for parking a return spring HVAC actuator at a closed position

A power transformation system that may incorporate inductive-capacitive circuits configured to receive AC power and filter out output power, a voltage regulator (e.g., microprocessor), a transistor/switch configured to connect or disconnect the input inductive-capacitive circuit to or from, respectively, an output filter, and a level shifter configured to provide a control signal to the transistor to connect or disconnect the inductive-capacitive circuit via the transistor/switch, to or from, respectively, the output filter. The input inductive-capacitive circuit may provide power factor correction for the AC power. The level shifter may provide pulse width modulation control signals to the transistor/switch for connection or disconnection between the inductive-capacitive circuit and the output filter. An input for controlling the level shifter may be provided by an output from a micro controller which is developed by a program that processes information from the output voltage received by the inductive-capacitive circuit output filter.

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Brno, Czechia

Petr Senfluk