According to one embodiment, a controller of a stepping motor includes a table generating unit and a current controlling unit. The table generating unit generates a data table of a threshold by using values of induced voltage at frequencies of switching signal that changes a set value of a drive current, the threshold being proportional to a frequency of the switching signal within an operation region in which the frequency of the switching signal is lower than a predetermined frequency, the values of the induced voltage including a first induced voltage generated at a first frequency of the switching signal and a second induced voltage generated at a second frequency of the switching signal. The current controlling unit controls a value of the drive current in accordance with a comparison result between the threshold and an induced voltage that is detected at a frequency lower than the predetermined frequency.

In order to suppress high-frequency noise in micro-step driving of a stepping motor, a motor control device (100) includes an H bridge circuit (20) and control means for driving a switching element of the H bridge circuit (20) with a PWM signal and for setting a charge mode, a fast attenuation mode, or a slow attenuation mode for a motor coil. In a range from an electrical angle where the reference current value starts descending to an electrical angle of +52°, the control means switches the H bridge circuit (20) every PWM cycle to the charge mode and then to the slow attenuation mode. In a range exceeding +52° and to +90 degrees where the reference current value starts ascending, the control means switches the H bridge circuit (20) every PWM cycle to the charge mode and, if the motor current exceeds the reference current value, then the control means switches it to the fast attenuation mode and further to the slow attenuation mode.

In order to suppress high-frequency noise in micro-step driving of a stepping motor, a motor control device (100) includes an H bridge circuit (20) and control means for driving a switching element of the H bridge circuit (20) with a PWM signal and for setting a charge mode, a fast attenuation mode, or a slow attenuation mode for a motor coil. In a range from an electrical angle where the reference current value starts descending to an electrical angle of +52°, the control means switches the H bridge circuit (20) every PWM cycle to the charge mode and then to the slow attenuation mode. In a range exceeding +52° and to +90 degrees where the reference current value starts ascending, the control means switches the H bridge circuit (20) every PWM cycle to the charge mode and, if the motor current exceeds the reference current value, then the control means switches it to the fast attenuation mode and further to the slow attenuation mode.

Provided is a control device for controlling an electromagnetic actuator that vibrates an operation device by driving the operation device supported by an elastic support part so as to be elastically vibrated in one direction in a vibrating direction thereof, the control device comprising: a current pulse supply unit configured to supply a driving current pulse to a coil of the electromagnetic actuator as a driving current for driving the operation device in accordance with a touch operation of the operation device, wherein the current pulse supply unit supplies the drive current pulse capable of starting the elastic vibration as a main driving current pulse, and then supplies the drive current pulse capable of adjusting attenuation period of the elastic vibration as a sub-driving current pulse.

An integrated circuit includes an H-bridge circuit having a first output node for coupling to a high-side terminal of an inductor and a second output node for coupling to a low-side terminal of the inductor. A current source is coupled in series with a current sense FET between a digital upper supply voltage and the first output node, wherein during a fast decay mode, a gate of the current sense FET is coupled to be turned on. A current-sense comparator includes a first input coupled to a sensing node between the current source and the current sense FET, a second input coupled to the lower supply voltage and an output coupled to a driver control circuit.

An integrated circuit includes an H-bridge circuit having a first output node for coupling to a high-side terminal of an inductor and a second output node for coupling to a low-side terminal of the inductor. A current sense FET is coupled between a current source and the lower supply voltage to provide a reference current that includes a peak current limit at a sensing node. A current-sense comparator has a first input coupled to the sensing node, a second input coupled to the second output node and an output coupled to send an output signal towards a driver control circuit. A FET linear detection circuit is coupled to receive a gate voltage of an active low-side power FET and has an output coupled to enable the current-sense comparator when the active low-side power FET is operating in a linear region.

An integrated circuit includes an H-bridge circuit having a first output node for coupling to a high-side terminal of an inductor and a second output node for coupling to a low-side terminal of the inductor. A current sense FET is coupled between a current source and the lower supply voltage to provide a reference current that includes a peak current limit at a sensing node. A current-sense comparator has a first input coupled to the sensing node, a second input coupled to the second output node and an output coupled to send an output signal towards a driver control circuit. A FET linear detection circuit is coupled to receive a gate voltage of an active low-side power FET and has an output coupled to enable the current-sense comparator when the active low-side power FET is operating in a linear region.

According to one embodiment, there is provided a control device including a drive circuit and a control circuit. The drive circuit includes a plurality of transistors and a current determination circuit. The plurality of transistors is electrically connected in parallel to each other between a first node and a second node. The first node is connected to a power supply circuit. The second node is connected to a DC motor. The current determination circuit determines a current flowing between the first node and the second node. The control circuit generates a control signal to control a number of transistors to be turned on among the plurality of transistors in accordance with the determined current. The drive circuit drives the DC motor using a current in response to the control signal.

A motor is disclosed. The motor includes a first end bell, a second end bell and a stator with a stator coil disposed between the first end bell and the second end bell. A rotor with a rotor shaft is disposed relative to the stator, the rotor configured to rotate relative to the stator and the rotor shaft extending through the first end bell. The second end bell includes a chamber, the chamber includes an electronic circuit and a connector. The connector is electrically coupled to the electronic circuit and configured to receive both a control signal and a power signal from an external source.

A motor is disclosed. The motor includes a first end bell, a second end bell and a stator with a stator coil disposed between the first end bell and the second end bell. A rotor with a rotor shaft is disposed relative to the stator, the rotor configured to rotate relative to the stator and the rotor shaft extending through the first end bell. The second end bell includes a chamber, the chamber includes an electronic circuit and a connector. The connector is electrically coupled to the electronic circuit and configured to receive both a control signal and a power signal from an external source.