A precision control device generally includes a current-limiting resistance, a voltage control unit, and a feedback voltage regulation unit. The current-limiting resistance has a grounded end and is serially connected to a DC load. The voltage control unit includes a microprocessor, an ADC, and a DAC. The feedback voltage regulation unit includes at least one operational amplifier and a transistor having a control input, a collector, and an emitter. The transistor is configured to operate at an unsaturated region, wherein the control input thereof receives a signal sent from an output terminal of the operational amplifier. The precision control device enables a power supply to smoothly adjust a predetermined output voltage set value for the DC load in response to a deviation of a voltage applied to the DC load. As such, the current flowing through the DC load and the current-limiting resistance can be regulated at a stable level.

A precision control device generally includes a current-limiting resistance, a voltage control unit, and a feedback voltage regulation unit. The current-limiting resistance has a grounded end and is serially connected to a DC load. The voltage control unit includes a microprocessor, an ADC, and a DAC. The feedback voltage regulation unit includes at least one operational amplifier and a transistor having a control input, a collector, and an emitter. The transistor is configured to operate at an unsaturated region, wherein the control input thereof receives a signal sent from an output terminal of the operational amplifier. The precision control device enables a power supply to smoothly adjust a predetermined output voltage set value for the DC load in response to a deviation of a voltage applied to the DC load. As such, the current flowing through the DC load and the current-limiting resistance can be regulated at a stable level.

Technical solutions are described for generating an output torque from a multi-winding PMDC motor. An example method includes generating, by a current controller, a first voltage command for a first winding set from a plurality of winding sets of the PMDC motor, the first winding set generates a first current in response to the first voltage command. The method further includes generating, by the current controller, a second voltage command for the second winding set from the winding sets of the PMDC motor, the second winding set generates a second current in response to the second voltage command. The method further includes generating, by the PMDC motor, the output torque based on the first current and the second current.

Technical solutions are described for generating an output torque from a multi-winding PMDC motor. An example method includes generating, by a current controller, a first voltage command for a first winding set from a plurality of winding sets of the PMDC motor, the first winding set generates a first current in response to the first voltage command. The method further includes generating, by the current controller, a second voltage command for the second winding set from the winding sets of the PMDC motor, the second winding set generates a second current in response to the second voltage command. The method further includes generating, by the PMDC motor, the output torque based on the first current and the second current.

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.

According to one embodiment, a semiconductor device includes a semiconductor element and a control device. The semiconductor element includes a first semiconductor region of a first conductivity type, a second semiconductor region of a second conductivity type, a third semiconductor region of the first conductivity type, a conductive portion, and a gate electrode. In a first operation, the control device changes a potential of the conductive portion from a first potential to a second potential. In a second operation, the control device changes a potential of the gate electrode from a third potential to a fourth potential. In a third operation, the control device changes the potential of the gate electrode from the fourth potential to the third potential. In a fourth operation, the control device changes the potential of the conductive portion from the second potential to the first potential after the third operation.

An actuator for a cooling fan module includes a controller, a first motor and a second motor. The controller includes a controlling unit configured to receive control commands, and a motor driving unit electrically connected to the controlling unit and powered by a DC power supply. The first motor is electrically connected to the motor driving unit. The second motor is connected in parallel to the first motor. The first motor and the second motor are synchronously driven and controlled by the controller.

An actuator for a cooling fan module includes a controller, a first motor and a second motor. The controller includes a controlling unit configured to receive control commands, and a motor driving unit electrically connected to the controlling unit and powered by a DC power supply. The first motor is electrically connected to the motor driving unit. The second motor is connected in parallel to the first motor. The first motor and the second motor are synchronously driven and controlled by the controller.

A dynamic energy harvesting and variable harvesting force system is disclosed. A boost converter increases a motor voltage as a motor current associated with the motor voltage propagates through the boost converter thereby generating a boost voltage associated with the changing motor current. A power storage device stores energy harvested by the boost converter when the boost voltage exceeds an energy storage threshold. A controller dynamically adjusts a harvesting force applied by the motor so that the harvesting force is relative to the force applied to the motor. The controller also dynamically adjusts the harvested energy stored by the power storage device by adjusting the charging of the power storage device, ensuring that the boost voltage threshold is maintained. The boost voltage when maintained within the boost voltage threshold enables the power storage device to store the harvested energy without impacting the harvesting force applied by the motor.