The present disclosure discloses an IGBT driving circuit for an electric-motor controller and an electric-motor controller. The IGBT driving circuit includes: a function safety circuit provided on a driver board of the electric-motor controller, and a detection feedback circuit and a pulse-width-modulation (PWM) buffer circuit that are connected to the function safety circuit. The detection feedback circuit is configured to detect an IGBT module of the electric-motor controller, and when a specified malfunction of the IGBT module is detected, send a specified-malfunction signal to the function safety circuit. The function safety circuit is configured to judge according to a preset malfunction treating rule and the received specified-malfunction signal, and then output a corresponding controlling signal to the PWM buffer circuit. The PWM buffer circuit is configured to generate according to the corresponding controlling signal a PWM signal that drives the IGBT module, to control ON/OFF of the IGBT module to protect the IGBT module. The technical solutions of the present application have multiple functions of protection, which improves the stability and the safety of the IGBT, and has quick action and timely protection.

A circuit for minimizing energy provided to a ground fault includes a source, a multiple switches, an output filter, and a controller. The switches include a first side pair of switches and a second side pair of switches configured to provide an output signal based on the source. The output filter includes one or more energy storage elements coupled to the first side pair of switches or the second side pair of switches. The controller is configured to receive a ground fault signal that indicates a fault has occurred and configured to generate a switch signal for the switches for a minimum energy state of the output filter and in response to the ground fault signal.

A crowbar circuit includes a diode bridge and switching elements, and is configured to rectify the full wave of AC power between the power lines and output the rectified AC power to a positive electrode line and a negative electrode line. A capacitor is connected between the power line and the negative electrode line. When a detection value of a current sensor indicates that the power reception device is not receiving power normally, a charging ECU stops the power conversion operation of the power transmission device, and thereafter outputs at least one of short circuit commands to the crowbar circuit so as to determine whether or not a malfunction is present in the crowbar circuit based on a detection value of the voltage sensor.

An overcurrent detection circuit includes a di/dt detection circuit to detect di/dt of a current Ie that flows in an emitter of an IGBT, a control circuit to detect whether the current Ie is an overcurrent based on di/dt and to output a detection result to a driving circuit, and a mask circuit to set a mask period in which an operation of overcurrent determination in the control circuit is masked.

A circuit for minimizing energy provided to a ground fault includes a source, a multiple switches, an output filter, and a controller. The switches include a first side pair of switches and a second side pair of switches configured to provide an output signal based on the source. The output filter includes one or more energy storage elements coupled to the first side pair of switches or the second side pair of switches. The controller is configured to receive a ground fault signal that indicates a fault has occurred and configured to generate a switch signal for the switches for a minimum energy state of the output filter and in response to the ground fault signal.

A drive control apparatus and method for a yaw motor of a wind turbine is provided. The drive control apparatus includes a frequency converter, a fault cut-out contactor, and a contactor. The frequency converter is configured to perform drive control on the yaw motor. The fault cut-out contactor is connected in series between the frequency converter and the yaw motor, and configured to be switched off in a case of a fault in the frequency converter, to isolate the failed frequency converter. The contactor is connected in parallel with the frequency converter and the fault cut-out contactor, connected to the yaw motor, and configured to continue to drive the yaw motor in a case that the fault cut-out contactor is switched off. The drive control apparatus and method can solve problem of low reliability of drive control of the yaw motor.

An object of the present invention is to stop the driving of a semiconductor element swiftly at a time of abnormality while sharing an output terminal between temperature information and an error signal in an IPM. In the intelligent power module of the present invention, each drive circuit includes an output control circuit configured to select the error signal while the error signal generation circuit outputs the error signal, to select the temperature signal while the error signal generation circuit does not output the error signal, and to output a selected signal as an alarm signal. The temperature signal generation circuit is configured to change the voltage value of the temperature signal in accordance with the element temperature of the specific semiconductor element within a voltage range different from the voltage value of the error signal.

A power inverter includes a bridge circuit including a first half-bridge and a second half-bridge, each half-bridge including a high-side device and a low-side device, and a gate driver circuit connected with each gate of the high-side device and low-side power device of the first and second half-bridges and operable to provide each gate with a respective voltage to control operation of the respective power device. The gate driver is operable to provide a first voltage which is higher than a first threshold voltage of the respective power device, and a second voltage which is higher than a surge threshold of the respective power device. The surge threshold is higher than the first threshold and defines the onset of a surge current operation area of the respective power device at which the power device becomes conducts a surge current that is larger than the rated current of the device.

A motor control method includes acquiring n-phase currents, where n is an integer of three or more, of a first inverter, a GND current of the first inverter, n-phase currents of a second inverter, and a GND current of the second inverter, generating a first fault signal indicating presence or absence of a shunt resistor fault in the first inverter based on the n-phase currents and GND current of the first inverter and generating a second fault signal indicating presence or absence of a shunt resistor fault in the second inverter based on the n-phase currents and GND current of the second inverter, referring to a table representing a relationship between a set of levels of the first fault signal and the second fault signal and control modes and selecting one of the control modes, and controlling a motor in accordance with the selected control mode.

According to one aspect, an uninterruptible power supply system is provided including an input configured to receive input power, an interface configured to be coupled to a backup power supply and to receive backup power from the backup power supply, an output configured to provide output power derived from at least one of the input power and the backup power to a load, a power converter coupled to the input, a capacitor, and a shoot-through detector coupled to the capacitor. The shoot-through detector is configured to obtain a first voltage value indicative of a first voltage across the capacitor, obtain a second voltage value indicative of a second voltage across the capacitor, compare the first voltage value to the second voltage value, determine, based on the comparison, that the capacitor is experiencing a shoot-through condition, and provide an output signal indicative of the shoot-through condition.