公开(公告)号：US20240128901A1

公开(公告)日：2024-04-18

申请号：US17965519

申请日：2022-10-13

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Miroslav Oljaca ,  David Stout ,  Dennis P. Lehman ,  Jan Morten Braathen ,  Merril Newman

IPC: H02P6/10 ,  H02P6/182

CPC classification number: H02P6/10 ,  H02P6/182 ,  H02P21/18

Abstract: Methods, circuits and computer program products are presented herein. The method includes isolating a ripple waveform from a current signal originating from a brushed direct current motor (BDCM). The method includes determining the wave count of the ripple waveform. The method includes determining a position of a movable structure operably coupled to a shaft of the BDCM according to the wave count of the ripple waveform. The present technology may be practiced without discrete capacitor components in high pass filtering aspects of the disclosed circuit. The methods, circuits and computer program products can be implemented to accurately determine a rotational position of a shaft of a BDCM and also position(s) of mechanism(s) coupled to the shaft without requiring any external sensors or other components for this purpose other than the disclosed circuits.

公开(公告)号：US20220236816A1

公开(公告)日：2022-07-28

申请号：US17506139

申请日：2021-10-20

Applicant: Texas Instruments Incorporated

Inventor： Jan Morten Braathen ,  Dennis Patrick Lehman ,  Miroslav Oljaca ,  Maxwell G Robertson ,  Merril Newman

IPC: G06F3/044 ,  G06F3/041

Abstract: A human machine interface (HMI) system and method of operating. The system includes capacitive measurement circuitry coupled to one or more capacitive touch elements, and piezoelectric measurement circuit including interface circuitry coupled to one or more piezoelectric touch elements. The capacitive measurement circuitry includes a gain stage configured to amplify a signal corresponding to a capacitance at the one or more capacitor input terminals by a gain level for communication to processing circuitry. Gain control circuitry is configured to increase the gain level of the gain stage of the capacitive measurement circuitry responsive to the piezoelectric measurement circuitry receiving a user input from at least one of the piezoelectric touch elements. Implementations that further include piezoelectric drive circuitry for haptic output and clearing debris from the keypad are also disclosed.

公开(公告)号：US11775120B2

公开(公告)日：2023-10-03

申请号：US17506139

申请日：2021-10-20

Applicant: Texas Instruments Incorporated

Inventor： Jan Morten Braathen ,  Dennis Patrick Lehman ,  Miroslav Oljaca ,  Maxwell G Robertson ,  Merril Newman

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0414

Abstract: A human machine interface (HMI) system and method of operating. The system includes capacitive measurement circuitry coupled to one or more capacitive touch elements, and piezoelectric measurement circuit including interface circuitry coupled to one or more piezoelectric touch elements. The capacitive measurement circuitry includes a gain stage configured to amplify a signal corresponding to a capacitance at the one or more capacitor input terminals by a gain level for communication to processing circuitry. Gain control circuitry is configured to increase the gain level of the gain stage of the capacitive measurement circuitry responsive to the piezoelectric measurement circuitry receiving a user input from at least one of the piezoelectric touch elements. Implementations that further include piezoelectric drive circuitry for haptic output and clearing debris from the keypad are also disclosed.