Abstract: A heating system for an aerosol generation assembly, includes a coil, a susceptor and an oscillation circuitry configured to generate AC current on the coil from a DC current provided by the battery. The oscillation circuitry comprises includes at least one power circuit including two power transistors (Q1A, Q1B) and a bias line (LA, LB) for each power transistor (Q1A, Q1B). Each power transistor (Q1A, Q1B) includes a gate terminal connected to the corresponding bias line (LA, LB) and able to control the current between the corresponding source and drain terminals. The oscillation circuitry further includes a microcontroller connected to both bias lines (LA, LB) and able to generate a voltage signal on each of the bias lines (LA, LB). The at least one power circuit further includes a potential divider defining an output terminal (T) connected to the microcontroller.

Abstract: The present invention concerns a method for controlling a heating system for an aerosol generation assembly containing a vaporizable material. The method includes controlling the temperature of a susceptor, during a pre heating phase, based on at least one vaporizable material characteristic inherent to the vaporizable material, at least one device characteristic inherent to the aerosol generation assembly, or on an ambient characteristic inherent to the ambient area; and controlling the temperature of the susceptor, during a heating phase, based on temperature measurements provided by a heating temperature sensor and a predetermined offset.

Abstract: A control system is provided for use in a power tool. The control system includes: a rotational rate sensor having a resonating mass and a controller electrically connected to the rotational rate sensor. The rotational rate sensor detects lateral displacement of the resonating mass and generates a signal indicative of the detected lateral displacement, such that the lateral displacement is directly proportional to a rotational speed at which the power tool rotates about an axis of the rotary shaft. Based on the generated signal, the controller initiates a protective operation to avoid further undesirable rotation of the power tool. The controller may opt to reduce the torque applied to shaft to a non-zero value that enables the operator to regain control of the tool.

Abstract: A motor control module designed to control operation of a plurality of different motors in a plurality of different tools a power tool uses an electronic clutch in the module in conjunction with a mechanical clutch in the tool to protect the tool against an overload event. The module is adapted to implement methods to provide aural and/or tactile feedback to a tool user as a warning of an impending or current fault condition in the tool. The module can prevent power from inadvertently turning on either after an overload event has cleared with the tool plugged in and its power switch on, or after plugging in the tool within the power switch on. The control module is adapted to provide torque control for the power tool, to estimate tool motor temperature and to inform a tool user when a servicing need in the tool is required.

Abstract: A motor control module for a power tool includes a controller and a triac for controlling current to the given tool motor. The module includes a circuit within the controller for implementing a plurality of control methodologies related to synchronizing the module to the AC input signal, estimating average current flowing through the triac, compensating for amplifier offset to improve accuracy of current measurements in the module, and providing speed measurement and control for the tool motor using principles of hysteresis in a comparator of the controller. Additionally, the controller is configured to calibrate an oscillation calibration register therein.

Abstract: A control system is provided for use in a power tool. The control system includes: a rotational rate sensor having a resonating mass and a controller electrically connected to the rotational rate sensor. The rotational rate sensor detects lateral displacement of the resonating mass and generates a signal indicative of the detected lateral displacement, such that the lateral displacement is directly proportional to a rotational speed at which the power tool rotates about an axis of the rotary shaft. Based on the generated signal, the controller initiates a protective operation to avoid further undesirable rotation of the power tool. The controller may opt to reduce the torque applied to shaft to a non-zero value that enables the operator to regain control of the tool.

Abstract: A method for controlling the operation of a motor utilizing a generic motor control module. The method includes sampling at least one motor operating criterion during operation of the motor and executing a generic control algorithm at a predetermined periodic interval. Execution of the algorithm provides a firing angle, duty cycle, or other suitable control function solution for an electronic valve for each periodic interval, thereby controlling the behavior of the motor. Additionally, the method includes firing the electronic valve at the calculated timing during each periodic interval such that the motor functions in accordance with desired motor operational parameters.