A power conversion circuit having a solid-state circuit breaker integrated therein is disclosed. With a disconnect switch between a utility source and the power conversion apparatus described for meeting UL489, the power conversion circuit includes an input connectable to an AC source, a rectifier circuit connected to the input to convert an AC power input to a DC power, and a DC link coupled to the rectifier circuit to receive the DC power therefrom. The rectifier circuit comprises a plurality of phase legs each including thereon an upper switching unit and a lower switching unit, wherein at least one of the upper and lower switching units on each phase leg comprises a bi-directional switching unit that selectively controls current and withstands voltage in both directions, so as to provide a circuit breaking capability that selectively interrupts current flow through the rectifier circuit, while maintaining original power conversion functionalities.

A system for controlling an operation of an induction motor (IM). A controller processor detects a spectrum of a current signal from received sensor data using a module. Obtain a number of rotor bars and a number of pole pairs of the IM to identify a principle slot harmonics (PSH) type IM from stored IM data. Use the PSH-type IM to identify a static eccentricity (SE) fault signature signal located at a secondary PSH frequency of the PSH-type IM. Determine a level of signal strength in the spectrum of the current signal at a location of the secondary PSH frequency, and compare to a SE fault table database to obtain a SE fault level of the PSH-type IM. Compare the SE fault level to a database to obtain a SE fault threshold, and if the SE fault level is outside the SE threshold, generate an interrupt command to the controller.

A control system for a hybrid electric powerplant of an aircraft can include a heat engine controller configured to receive one or more power settings and to determine a heat engine setting and an electric motor setting. The heat engine controller can be configured to use the heat engine setting to control a heat engine system as a function of the heat engine setting to control torque output by a heat engine. The heat engine controller can be configured to output the electric motor setting. The system can include an electric motor controller can be operatively connected to the heat engine controller. The electric motor controller configured to receive the electric motor engine setting from the heat engine controller and to control an electric motor system as a function of the electric motor setting to control torque output by an electric motor. The system can include a system protection module that can be part of or connected to the heat engine controller and can be configured to provide one or more protection commands to directly control one or more heat engine protection systems and one or more electric motor protection systems.

A protection function of an electronic device is realized with a lower cost. A load drive circuit 102 includes: transistors Qa and Qb for protection of an N-channel type connected between a power source terminal P1 and a power source end P7 for driving; an inverter circuit 14 that drives a load based on an input drive control signal Sd, the inverter circuit 14 being disposed between the power source end P7 for driving and a ground potential; and a booster unit 16 including a capacitor C1 having one terminal connected to an output end of the inverter circuit 14, the booster unit 16 generating, across another terminal of the capacitor C1, a voltage exceeding a power source voltage Vdc, and applying the voltage to control electrodes of the transistors Qa and Qb for protection.

Improvements to a power input circuit of an electric motor drive system are provided. The power input circuit is provided between a power source (e.g., battery), and a load (e.g., an inverter and a motor in the electric motor drive system). The power input circuit can comprise controllable switches for reverse polarity protection and isolation of the inverter under supply short circuit condition. In addition, an improvement to a power input circuit can comprise connection of a power supply (e.g., voltage regulator) to the external power source input side of a reverse polarity protection circuit in the power input circuit to mitigate against microcontroller restart from post-failure shutdown condition. Connection of a low-power diode in series with the voltage regulator also provides for reverse polarity protection.

The present disclosure relates to a driving apparatus for a reclosing apparatus and a driving method thereof. The driving apparatus comprises a first energy storage unit, a timing unit, a control unit, and a first power supply unit, a second energy storage unit and a driving unit. The timing unit outputs a first enable signal; the control unit outputs a second enable signal or a third enable signal; the first power supply unit enables the second energy storage unit to receive the power when receiving the second enable signal, and enables the second energy storage unit to discharge when receiving the third enable signal; the second energy storage unit receives and stores the power via the first power supply unit; and the driving unit provides the power stored in the first energy storage unit to the reclosing apparatus when a predetermined condition is satisfied.

A circuit with a Safe-Torque-Off (STO) functionality and a frequency converter including the same are provided. According to embodiments, the circuit may include a first STO channel configured to control on/off of power supply to a high-side driver of a frequency converter based on a first STO signal, a second STO channel configured to control on/off of power supply to a low-side driver of the frequency converter based on a second STO signal, and a third STO channel configured to control supply of a drive control signal from a controller of the frequency converter to the high-side driver and the low-side driver based on a result of a logical operation of the first STO signal and the second STO signal, wherein the logical operation is configured to make the result active in response to at least one of the first and second STO signals being active.

A control system for a hybrid electric powerplant of an aircraft can include a heat engine controller configured to receive one or more power settings and to determine a heat engine setting and an electric motor setting. The heat engine controller can be configured to use the heat engine setting to control a heat engine system as a function of the heat engine setting to control torque output by a heat engine. The heat engine controller can be configured to output the electric motor setting. The system can include an electric motor controller can be operatively connected to the heat engine controller. The electric motor controller configured to receive the electric motor engine setting from the heat engine controller and to control an electric motor system as a function of the electric motor setting to control torque output by an electric motor. The system can include a system protection module that can be part of or connected to the heat engine controller and can be configured to provide one or more protection commands to directly control one or more heat engine protection systems and one or more electric motor protection systems.

A power conversion circuit having a solid-state circuit breaker integrated therein is disclosed. With a disconnect switch between a utility source and the power conversion apparatus described for meeting UL489, the power conversion circuit includes an input connectable to an AC source, a rectifier circuit connected to the input to convert an AC power input to a DC power, and a DC link coupled to the rectifier circuit to receive the DC power therefrom. The rectifier circuit comprises a plurality of phase legs each including thereon an upper switching unit and a lower switching unit, wherein at least one of the upper and lower switching units on each phase leg comprises a bi-directional switching unit that selectively controls current and withstands voltage in both directions, so as to provide a circuit breaking capability that selectively interrupts current flow through the rectifier circuit, while maintaining original power conversion functionalities.

A power tool comprises a housing and an electric motor disposed in the housing. A rotary output is driven by the motor. Electronic sensor configured to sense operating parameters of the power tool includes a voltage sensor arranged to detect the voltage across the electric motor, a current sensor arranged to detect the current through the tool, and a speed sensor arranged to detect the angular velocity ω of the output spindle. Electronic control apparatus is configured to determine from the operating parameter output signals the torque M of the rotary output and control the angular velocity of the rotary output in response to the calculation of the torque of said rotary output.