A drive device performs switching of at least one switch configuring an electrical power converter. The drive device includes a control section that generates a drive signal for the switch and transmits the drive signal, and at least one drive circuit that receives the transmitted drive signal. The control section generates speed adjustment information for adjusting a switching speed of the switch and transmits the speed adjustment information to the drive circuit. The drive circuit includes a speed calculation section that receives the transmitted speed adjustment information and calculates command switching speed information of the switch based on the received speed adjustment information, and a drive section that performs switching of the switch based on the received drive signal and the calculated command switching speed information.

A brushless direct-current (BLDC) motor has a connector, a stator, a rotor and a positioning module. The connector has three input ends for receiving three voltage signals, and a feedback end for receiving a feedback signal. The three voltage signals are transmitted to three windings of the stator. Rotation of the rotor is induced by interaction of magnetic fields of the three windings and a plurality of magnets of the rotor. The positioning module is fixed to the stator and has three Hall sensors for sensing positions of the magnets. The positioning module generates the feedback signal according to the positions of the plurality of magnets sensed by the three Hall sensors. The first voltage signal, the second voltage signal and the third voltage signal are adjusted according to the feedback signal.

The present invention provides a control system (100, 200, 300) for controlling a single phase induction motor (150, 250) with a main winding (151, 251) and with an auxiliary winding (152, 252), the control system (100, 200, 300) comprising a first bidirectional switching element (101) and a second bidirectional switching element (102), wherein the first bidirectional switching element (101) is arranged between a phase supply input (103, 203) of the single phase induction motor (150, 250) and the main winding (151, 251) and wherein the second bidirectional switching element (102) is arranged electrically parallel to the main winding (151, 251), and a control unit (105, 205) coupled to the first bidirectional switching element (101) and the second bidirectional switching element (102).

To provide a system of low cost and low loss capable of the supply of electric power according to characteristics of each of a plurality of motors from a single battery. A power supply system for a vehicle of the present invention includes: a high-voltage battery; a first inverter which connects with the high-voltage battery; a motor described later which connects with the first inverter; a high-voltage DCDC converter which is connected to the high-voltage battery and steps down the voltage of the high-voltage battery; a second inverter which connects with the high-voltage battery; and a motor described later which connects with the second inverter.

Apparatus and methods are provided for operating an electric motor, comprising selectively energising the coils of a stator having a plurality of stator teeth, each stator tooth having a said coil mounted thereon. The stator coils of a subset of the stator teeth are energised during a given time period to attract a corresponding rotor tooth into alignment with each of the stator teeth in the subset over the given time period. The stator coil of at least one stator tooth in the subset is energised during a portion of the given time period before the at least one stator tooth overlaps the corresponding rotor tooth.

A filter unit is intended to be connected between an inverter and an electric motor. The filter unit includes: a number of phase connections for connecting to corresponding phase connections of the inverter; a first DC link connection for connecting to a first DC link connection on the inverter and a second DC link connection for connecting to a second DC link connection on the inverter; a number of motor connections for connecting to corresponding connections on the electric motor; a number of filter elements for reducing a rate of voltage rise at the motor connections of the filter unit, filter element is connected between corresponding phase connections of the filter unit and corresponding motor connections of the filter unit; and a coupling unit, which couples the filter elements capacitively with the first DC link connection and the second DC link connection of the filter unit.

An electric power conversion system includes: an inverter; a voltage converter including a high-voltage end connected to a direct-current power source and a low-voltage end connected to the inverter; and a controller. The controller is configured to control switching elements such that a voltage of the low-voltage end becomes lower than a voltage of the high-voltage end in a first state. The controller is configured to control the switching elements such that the voltage of the low-voltage end becomes equal to the voltage of the high-voltage end in a second state.

A vehicle includes a boost converter configured to bypass or to convert a stack voltage and output the bypassed or converted stack voltage as a first voltage in response to a first control signal, a first switching unit configured to be switched in response to a first switching signal to form a main path to supply the first voltage to a battery, a buck converter configured to convert and output a level of the first voltage to the battery as a second voltage in response to a second control signal, a second switching unit configured to be switched in response to a second switching signal to form a bypass path to supply the second voltage to the battery, and a controller configured to inspect a level of voltage charged in the battery and generate the first and second control signals and the first and second switching signals based thereon.

The present invention easily inhibits an influence of a dead time on voltage control without requiring a user to consider a specific usage condition or the like of each motor control device. A control circuit (10) controls a step-down converter circuit (40) to step down a DC voltage to be applied to an inverter circuit (60) so that a duty of a PWM signal becomes greater than a dead time (Td).

The present disclosure discloses a control system for enhancing a frequency support capability of a wind turbine generator system. The control system includes a wind turbine, a gearbox, an electric generator and a converter. The control system is characterized by further including a supercapacitor energy storage apparatus, which includes a DC-DC converter and a supercapacitor. The converter includes DC buses, and the supercapacitor is electrically connected to the DC buses via the DC-DC converter. The supercapacitor may be orderly charged or discharged according to an operating state of the wind turbine generator system to maintain its operating condition, and has a superior reliability.