A turn-off circuit for a semiconductor switch includes an element having a variable resistance coupled to a control input of the semiconductor switch, a circuit for generating a control-input reference signal, and a control circuit coupled to adjust a resistance of the element having a variable resistance in response to the control-input reference signal in a closed control loop in order to turn off the semiconductor switch.

A drive device for a voltage-controlled semiconductor element. The drive device includes: a short-circuit current detection circuit which detects a short-circuit current flowing through the voltage-controlled semiconductor element; a timer circuit which outputs a time setting signal indicative of a determined time, responsive to the short-circuit current detection circuit detecting the short-circuit current; and a control power source voltage variable circuit which receives a power supply voltage applied to the drive device, decreases the power supply voltage for a period for which the control power source voltage variable circuit receives the time setting signal from the timer circuit, to thereby obtain a stepped-down voltage, and outputs the stepped-down voltage as a control power source voltage.

A level shifter includes a converter configured to generate a first driving signal and a second driving signal; a current sensing circuit configured to detect a current corresponding to a voltage change of second power, and generate a freezing signal according to the current; a freezing circuit configured to control an operation of the converter according to the freezing signal.

A power module apparatus includes a power substrate, at least one power device electrically connected to the power substrate and a gate-source board mounted relative to the power substrate, the gate-source board electrically connected to the at least one power device, a housing secured to the power substrate, and a clamping circuit electrically connected to the at least one power device. The clamping circuit being configured to reduce a voltage charge up at a gate of the at least one power device to within 8 V of a desired voltage.

A device includes a first switch and a first diode connected in parallel between a midpoint and a first terminal of the hybrid power device, a second switch and a second diode connected in parallel between the midpoint and a second terminal of the hybrid power device, a third switch coupled between the first terminal and the second terminal, and a third diode connected between the first terminal and the second terminal.

Systems and methods for controlling operation of a power converter based on grid conditions are provided. In particular, a first gating voltage can be applied to a switching element of a power converter associated with a wind-driven power generation system. The first gating voltage can be greater than a threshold voltage for the switching element. A grid event associated with an electrical grid coupled to the power generation system can be detected. A second gating voltage can be applied to the gate of the switching element during the detected grid event. The second gating voltage can be greater than the first gating voltage.

Provided is a power semiconductor element gate driving circuit that performs ON/OFF control on main current of a power semiconductor element having a gate electrode by charging the gate electrode of the power semiconductor element with electric charges and discharging the electric charges on the basis of an inputted gate signal. When the gate signal is switched to an OFF signal, control is performed such that gate current for discharging the electric charges from the gate electrode increases in association with increase in a temperature of the power semiconductor element and decreases in association with increase in the main current.

A switch including a transistor to be protected, and a Miller effect protection unit including a protection transistor, the drain of the protection transistor being connected to the gate of the transistor to be protected, the source of the protection transistor being connected to the source of the transistor to be protected, a linking circuit, the linking circuit being a high-pass filter arranged between the gate of the protection transistor and the drain of the transistor to be protected, and a control circuit interposed between the gate of the protection transistor and the source of the transistor to be protected.

The present invention relates to a relay driving circuit and a battery system for generating a gate voltage for controlling ON/OFF of a pre-charge relay, and provides a relay driving circuit that controls electrical connection between an external device and a battery pack, including: a transistor that receives a control signal of an enable level to perform an ON operation; a first resistor having a first end connected to a positive electrode of the battery pack and a second end connected to the relay, by the ON operation of the transistor; and a second resistor connected between the the second end of the first resistor and the external device, the relay receives power supplied from the battery pack in a ratio of a resistance value of the second resistor to a sum resistance value of the first resistor and the second resistor to perform an ON operation.

To provide a multi-phase power conversion device control circuit capable of preventing switching elements and driver circuits of a multi-phase power conversion device from being damaged even when arm short circuits have occurred to a plurality of phases simultaneously. The control circuit includes: a current detection unit configured to detect a current flowing through the switching element as a voltage value; an overcurrent detection unit configured to, when a voltage value detected by the current detection unit is higher than a first reference voltage, output an individual overcurrent detection signal Scu; and an overcurrent state control unit configured to, when overcurrent state is detected at the current detection unit of each of two or more phases, output a multi-phase overcurrent signal and short-circuit the control terminal of the switching element to an emitter terminal thereof.