Abstract: This application discloses a drive circuit, chip, and electronic device. The drive circuit includes an operational amplifier constant-current source circuit with an operational amplifier, a first switch coupled to the second node, a first resistor, and a second resistor; an H-bridge circuit with diagonally arranged second and fifth switches and third and fourth switches, configured to provide drive current to a motor; a switching circuit coupled to the second node, and control terminals of the second and third switches, configured to connect the second node to the control terminal of the second switch based on a valid first control signal, and/or to the control terminal of the third switch based on a valid second control signal; and a matching resistor coupled to the H-bridge circuit and ground voltage. This configuration provides stable and precise motor drive current even in high-frequency environments.

Abstract: Embodiments provide methods for controlling an actuator based on closed-loop feedback of capacitance measured between a rotor plate attached to a rotor and a stator plate attached to a stator. The methods involve measuring capacitance at a predetermined sampling rate using a capacitance sensing unit operationally connected to an actuator. The capacitance measurement is made between the rotor plate and the stator plate of the actuator and is subsequently stored. The methods further include calculating the capacitance change between two consecutive capacitance measurements using a processing unit operationally connected to an actuator. Based on calculated capacitance changes, a control signal is generated to regulate the operation of the actuator.

Abstract: An angle detection apparatus, method, and electronic device for detecting the rotational angle of an axis are disclosed. The apparatus comprises: a first electrode plate on a first plane; second and third electrode plates on a parallel plane, each being of equal size, sharing a common center, and shaped as ring sectors. A dielectric material is positioned between the planes, with its rotational axis perpendicular to the planes and aligned with the center of the ring sectors. The dielectric material's projection on each electrode plate forms a ring sector with matching center and diameters. A capacitance detection chip connects to the three electrode plates to measure the ratio between capacitances detected across the first-second and first-third electrode plates. Changes in this capacitance ratio over time indicate the rotational angle of the dielectric material's axis.

Abstract: Embodiments provide an integrated actuator and pressure sensor with closed-loop feedback of capacitance, resulting in improved actuation performance and cost-effective form factor. The disclosed integrated piezoelectric ceramic actuator comprises a capacitance sensing unit, and a piezoelectric ceramic. It operates in either actuation mode or pressure sensing mode. During the actuation operation mode, the integrated actuator generates a first control signal based on the capacitance measured at the capacitance sensing unit. During the pressure sensing operation mode, the working parameters corresponding to pressure applied to the piezoelectric ceramic are determined based on the measured capacitances.

Abstract: The present application discloses a capacitive screen, a method for its interaction with a stylus, and a storage medium. The capacitive screen includes a touch control chip and a screen coil. The touch chip generates a first current signal, which the screen coil, integrated as a metal coil, converts into a first electromagnetic signal. This signal is sent to the stylus, which then returns a second electromagnetic signal to the screen coil. The screen coil converts this into a second current signal for the touch chip, which calculates the distance between the screen and stylus. This invention enables real-time distance monitoring and interaction between the screen and stylus with low cost and power consumption.

Abstract: The present application discloses an anti-shake motor, a camera module, and electronic equipment. The anti-shake motor includes a base, an anti-shake bracket, a circuit board, and a conductive electrode plate. The anti-shake bracket is movably set on the base within a predetermined plane and has a conductive magnetic component. The circuit board is set on the base with a coil that drives the magnetic component to move the anti-shake bracket within the predetermined plane. The conductive electrode plate is set on the circuit board, forming a capacitor with the magnetic component, which is electrically connected to the circuit board to output the capacitive signal formed with the conductive electrode plate. The anti-shake motor, camera module, and electronic equipment provided in this embodiment can achieve closed-loop control of the anti-shake motor while minimizing internal space occupation.

Abstract: The present invention relates to the microelectronics domain, specifically to a capacitance measurement circuit and method designed to enhance precision in capacitance measurements. The circuit comprises a capacitor under test, which is connected at one end to the output of an excitation circuit and at the other end to the input of an adjustment circuit. It includes a first timing switch circuit connected between the input of a first amplification circuit and the output of the adjustment circuit, and a second timing switch circuit connected between the input of a second amplification circuit and the output of the adjustment circuit, with the first and second timing switch circuits operating alternately. The invention also features a capacitance detection circuit that consists of a differential amplifier and a comparator.

Abstract: The invention provides a focusing motor, a closed-loop control method for the focusing motor, and a camera device. The focusing motor includes a mover bracket and a mover plate mounted thereon, a stator and first stator plates and second stator plates mounted thereon, and a processing unit connected to the mover pole plate, the first stator plate and the second stator plate. The mover pole plate is positioned opposite the first stator plate and the second stator plate, and the facing areas change with the movement of the mover bracket. The processing unit controls the movement of the mover bracket in the focusing direction based on the capacitance signals formed by the mover pole plate and the first stator plate as well as the capacitance signals formed by the second stator plate.

Abstract: In accordance with the present disclosure, a method for controlling an anti-vibration actuator is provided such that the position of the applied opposite rotation in a gyro stabilization process can be measured using capacitance sensing. In some embodiments, a rotor plate attached to a rotor and a stator plate attached to a stator can be used to create a capacitance. When the rotor moves, a distance change value of the rotor can be calculated based on the capacitance measured between the rotor plate and the stator plate. In these embodiments, the cost and the form factor of the aforementioned anti-vibration actuator are reduced compared to implementation of magnetic field sensors in the anti-vibration actuator.

Abstract: Embodiments provide controlling an actuator such that inaccurate actuator control caused by the heat created when the actuator moves can be compensated. In some embodiments, a temperature sensor is implemented in an actuator controller outside of the actuator, and the temperature sensor is connected to the actuator through heat conductive materials. In these embodiments, the cost and the form factor of the aforementioned actuator is reduced compared to implementation of temperature sensors within the actuator.

Abstract: In accordance with the present disclosure, a method for controlling an anti-vibration actuator is provided such that the position of the applied opposite rotation in a gyro stabilization process can be measured using capacitance sensing. In some embodiments, a rotor plate attached to a rotor and a stator plate attached to a stator can be used to create a capacitance. When the rotor moves, a distance change value of the rotor can be calculated based on the capacitance measured between the rotor plate and the stator plate. In these embodiments, the cost and the form factor of the aforementioned anti-vibration actuator are reduced compared to implementation of magnetic field sensors in the anti-vibration actuator.

Abstract: In accordance with the present disclosure, a method for controlling an autofocus actuator is provided such that the actual position of the autofocus actuator can be measured using capacitance sensing. In some embodiments, a rotor plate attached to a rotor and a stator plate attached to a stator in the autofocus actuator can be used to create a capacitance. When the rotor moves, a capacitance change value between the rotor plate and the stator plate can be measured. In these embodiments, the cost and the form factor of the aforementioned autofocus actuator are reduced compared to implementation of magnetic field sensors in the autofocus actuator.

Abstract: Embodiments provide controlling an actuator such that inaccurate actuator control caused by the heat created when the actuator moves can be compensated. In some embodiments, a temperature sensor is implemented in an actuator controller outside of the actuator, and the temperature sensor is connected to the actuator through heat conductive materials. In these embodiments, the cost and the form factor of the aforementioned actuator is reduced compared to implementation of temperature sensors within the actuator.