摘要:
A bulk acoustic wave filter device and method thereof includes a first layer forming an air gap together with a substrate, a lower electrode disposed over the first layer, a piezoelectric layer disposed to cover a portion of the lower electrode, an upper electrode disposed over the piezoelectric layer, a frame layer disposed below the upper electrode, and a lower electrode reinforcing layer disposed on the lower electrode, other than portions in which the piezoelectric layer is disposed. The lower electrode reinforcing layer is formed by separating the lower electrode reinforcing layer from the upper electrode or the frame layer upon one of the upper electrode and the frame layer being formed.
摘要:
Embodiments of the invention provide a method and system for controlling a motor of an electric bicycle. According to various embodiments, the system includes a touch sensor positioned in a handle of the electric bicycle, configured to sense whether or not a user has touched the touch sensor, and configured to output a touch signal, and a controller configured to control driving of a driving motor. The controller is further configured to drive the driving motor only in the case in which the user's touch is sensed from the touch sensor.
摘要:
A bulk acoustic wave (BAW) filter includes: a substrate including a first mounting region and a second mounting region which are spaced apart from each other; a first fixing member disposed adjacent to the first mounting region; a second fixing member disposed adjacent to the second mounting region; a Tx filter mounted on the first mounting region and fixed by the first fixing member; and an Rx filter mounted on the second mounting region and fixed by the second fixing member.
摘要:
There is provided a driving circuit for a hybrid electric vehicle, including a first battery and a second battery, an inverter for converting an applied voltage to the form of direct current (DC) or alternating current (AC) according to the operating mode of the motor, a converter operating in a boost mode or a buck mode according to the operating mode of the motor, and a processor for comparing a voltage (VB1) of the first battery and a voltage of a DC-link capacitor and controls electrical connection between the first battery, and the inverter and the converter during start-up, wherein the DC-link capacitor is connected in parallel to the first battery, the inverter, and the converter.
摘要:
A motor driving apparatus may include a bidirectional converter including an energy storage unit and converting power bidirectionally; an inverter receiving the power from the bidirectional converter and driving a motor; and a power passing unit transferring energy stored in the energy storage unit of the bidirectional converter to the inverter.
摘要:
There is provided a driving apparatus of an interior permanent magnet synchronous motor (IPMSM) including a current command generator outputting a current command on a synchronous reference frame based on a command torque, wherein the current command generator generates the current command based on a variation in magnetic flux with respect to a rotor of the IPMSM.
摘要:
A motor driving apparatus having a protection function for protecting an inverter or a controller from a back electromotive voltage may include: a driving unit including at least one inverter arm switching driving power to drive a motor; a first switching unit forming a transfer path through which a back electromotive voltage from the motor is transferred to a charging unit; and a second switching unit including at least one switch positioned between a driving line of the driving unit and the motor and turned on and off at a preset interval to decrease a voltage level of the back electromotive voltage from the motor.