A system may include an output stage for driving a load at an output of the output stage, a pulse-width modulation mode path configured to pre-drive the output stage in a first mode of operation, a linear mode path configured to pre-drive the output stage in a second mode of operation and a loop filter coupled at its input to the output of the output stage and coupled at its output to both of the pulse-width modulation mode path and the linear mode path. The pulse-width modulation mode path and the linear mode path may be configured such that a first transfer function between the output of the loop filter and the output of the output stage is substantially equivalent to a second transfer function between the output of the loop filter and the output of the output stage

A drive circuit, which is mounted on an electronic apparatus having a voice coil motor and drives the voice coil motor, includes: an interface circuit configured to receive a first signal indicating a target position of the voice coil motor and a second signal related to a posture of the electronic apparatus; a control circuit configured to generate a current command value of a drive current in response to the first signal and the second signal; and a current driver configured to generate the drive current in response to the current command value and supply the drive current to the voice coil motor.

A drive circuit, which is mounted on an electronic apparatus having a voice coil motor and drives the voice coil motor, includes: an interface circuit configured to receive a first signal indicating a target position of the voice coil motor and a second signal related to a posture of the electronic apparatus; a control circuit configured to generate a current command value of a drive current in response to the first signal and the second signal; and a current driver configured to generate the drive current in response to the current command value and supply the drive current to the voice coil motor.

An actuator driving device includes a driving coil that generates a driving force with first and second voltages; and a control unit, which sets one of the first and second voltages to a first pulse, sets the other one to a second pulse, and performs at least one of: a first control for modulating one pulse width of the first and second pulses with a change amount larger than that of the other pulse width so that a pulse width of ON time of the second pulse is within a pulse width of ON time of the first pulse; and a second control for modulating one pulse width of the first and second pulses with a change amount larger than that of the other pulse width so that the pulse width of the first pulse in ON time is within the pulse width of the second pulse in ON time.

An actuator driving device includes a driving coil that generates a driving force with first and second voltages; and a control unit, which sets one of the first and second voltages to a first pulse, sets the other one to a second pulse, and performs at least one of: a first control for modulating one pulse width of the first and second pulses with a change amount larger than that of the other pulse width so that a pulse width of ON time of the second pulse is within a pulse width of ON time of the first pulse; and a second control for modulating one pulse width of the first and second pulses with a change amount larger than that of the other pulse width so that the pulse width of the first pulse in ON time is within the pulse width of the second pulse in ON time.

A movable body portion Sm is configured to reciprocate in a rotation angle range Zm between a first position Xa and a second position Xb according to energization control of a driving coil 6 and to be stopped at the first position Xa and the second position Xb by a pair of self-holding mechanisms 11a and 11b by restriction of a pair of restricting stopper mechanisms 10a and 10b and attraction of magnets 8a and 8b. when controlling switching from the second position Xb (or the first position Xa) to the first position Xa (or the second position Xb), after a driving voltage based on a driving pulse Ps is applied to the driving coil 6, if the movable body portion Sm has reached a predetermined intermediate position Xp in 10 to 50[%] of the rotation angle range Zm, control is performed so that application of the driving voltage is stopped.

Various embodiments of the present technology may comprise methods and apparatus for actuator control. The methods and apparatus may comprise various circuits and/or systems to detect an induced voltage and various signal processing functions to utilize the induced voltage to control the actuator. The apparatus for actuator control may comprise an induced voltage detection circuit and adjust the actuator position according to the detected induced voltage.

Various embodiments of the present technology may comprise methods and apparatus for actuator control. The methods and apparatus may comprise various circuits and/or systems to detect an induced voltage and various signal processing functions to utilize the induced voltage to control the actuator. The apparatus for actuator control may comprise an induced voltage detection circuit and adjust the actuator position according to the detected induced voltage.

An improved system and method for monitoring operation of movers in an independent cart system reduces the required communication bandwidth for monitoring operation of movers in a system where control is distributed among multiple controllers spaced along the track. As the mover is travelling along the track segment, each distributed controller monitors at least one operating characteristic of the mover. As a mover travels along the track, each distributed controller transmits the operating characteristic to a successive distributed controller, such the monitored operating characteristic is transmitted along the track as the mover travels along the track. At a reduced rate or upon request from a central controller, each distributed controller may transmit the status of a mover present on the corresponding track segment controlled by that distributed controller to the central controller.

An improved system and method for monitoring operation of movers in an independent cart system reduces the required communication bandwidth for monitoring operation of movers in a system where control is distributed among multiple controllers spaced along the track. As the mover is travelling along the track segment, each distributed controller monitors at least one operating characteristic of the mover. As a mover travels along the track, each distributed controller transmits the operating characteristic to a successive distributed controller, such the monitored operating characteristic is transmitted along the track as the mover travels along the track. At a reduced rate or upon request from a central controller, each distributed controller may transmit the status of a mover present on the corresponding track segment controlled by that distributed controller to the central controller.