A coil actuator for low and medium voltage applications comprising a coil electromagnet provided with a single coil winding and a movable anchor and a power and control unit comprising: a power circuit operatively coupled with said coil electromagnet, said power circuit comprising input terminals, at which said power circuit receives an input voltage; a PWM controller operatively coupled with said power circuit, said PWM controller being adapted to control an input current flowing through said power circuit to obtain and maintain an average operating level selected an excitation current feeding said coil electromagnet. Said PWM controller is adapted to set a plurality of reference values for said input current to control said input current, each reference value for said input current being selected among said plurality of reference values depending on the behavior of said input voltage.

Methods, systems, and devices for an H-bridge driver for haptics and camera voice coil motor applications are described. A device may generate a control signal for an application executing on the device such as a camera application, a gaming application, or any application receiving a user input or outputting feedback to the user. The device may generate the control signal using a voice coil motor driver of a camera component of the device. The device may drive a haptics motor based on the generated control signal and generate a haptic response based on driving the haptics motor. The device may, as a result, output the generated haptic response. Additionally or alternatively, the device may drive a voice coil motor based on the generated control signal and may control a camera component of the device based on driving the voice coil motor or the haptics motor, or both.

A method for minimizing undesired movement of a moving mass of an electromagnetic load may include detecting undesired movement of the moving mass based on real-time measurements of one or more parameters associated with the electromagnetic load and, responsive to detecting undesired movement of the moving mass, affecting a signal applied to the moving mass to reduce the undesired movement.

A method for minimizing undesired movement of a moving mass of an electromagnetic load may include detecting undesired movement of the moving mass based on real-time measurements of one or more parameters associated with the electromagnetic load and, responsive to detecting undesired movement of the moving mass, affecting a signal applied to the moving mass to reduce the undesired movement.

A drive device (9) drivably controls linear solenoid valves (SL1 to SL5) by inputting respective drive signals to one-side ends (5a) of the linear solenoid valves (SL1 to SL5) via a connector (Co) and wires (Ha). Other-side ends (5b) of the linear solenoid valves (SL1 to SL5) are connected to respective wires (56). The wires (56) are connected to the connector (Co) while being integrally commonalized by the common wire (57). This allows reducing the number of ground terminals gt of the connector (Co), whereby the connector (Co) can be downsized.

A drive device (9) drivably controls linear solenoid valves (SL1 to SL5) by inputting respective drive signals to one-side ends (5a) of the linear solenoid valves (SL1 to SL5) via a connector (Co) and wires (Ha). Other-side ends (5b) of the linear solenoid valves (SL1 to SL5) are connected to respective wires (56). The wires (56) are connected to the connector (Co) while being integrally commonalized by the common wire (57). This allows reducing the number of ground terminals gt of the connector (Co), whereby the connector (Co) can be downsized.

According to embodiments described herein, there are provided methods and apparatus for providing a driving signal to a transducer, wherein the driving signal is output by an amplifier. A method comprises receiving an indication of a voltage and a current of the driving signal; based on an electrical model of the transducer and the voltage and the current of the driving signal, estimating an estimated electrical response of the transducer representative of movement of a mass in the transducer; comparing the estimated electrical response to a desired electrical response; and controlling the driving signal based on the comparison.

According to embodiments described herein, there are provided methods and apparatus for providing a driving signal to a transducer, wherein the driving signal is output by an amplifier. A method comprises receiving an indication of a voltage and a current of the driving signal; based on an electrical model of the transducer and the voltage and the current of the driving signal, estimating an estimated electrical response of the transducer representative of movement of a mass in the transducer; comparing the estimated electrical response to a desired electrical response; and controlling the driving signal based on the comparison.

A linear vibration generating device installed inside a cellular phone, a vibration bell or the like to generate vibration. Right after the power applied to the ‘circuit (a circuit generating and controlling vibration)’, which is one of elements constituting the linear vibration generating device, is turned off, the ‘circuit’ is configured as a short circuit. In addition, the linear vibration generating device can be easily manufactured since an additional space inside the linear vibration generating device is not required, and there is an outstanding effect of promptly removing residual vibration by increasing the amount of vibration damping after the vibration operation of the vibration generating device including a permanent magnet is finished.

A linear vibration generating device installed inside a cellular phone, a vibration bell or the like to generate vibration. Right after the power applied to the ‘circuit (a circuit generating and controlling vibration)’, which is one of elements constituting the linear vibration generating device, is turned off, the ‘circuit’ is configured as a short circuit. In addition, the linear vibration generating device can be easily manufactured since an additional space inside the linear vibration generating device is not required, and there is an outstanding effect of promptly removing residual vibration by increasing the amount of vibration damping after the vibration operation of the vibration generating device including a permanent magnet is finished.