A high voltage switch comprising: a high voltage power supply providing power greater than about 5 kV; a control voltage power source; a plurality of switch modules arranged in series with respect to each other each of the plurality of switch modules configured to switch power from the high voltage power supply, and an output configured to output a pulsed output signal having a voltage greater than the rating of any switch of the plurality of switch modules, a pulse width less than 2 s, and at a pulse frequency greater than 10 kHz.

A method for controlling an electronic semiconductor switch connected in a load current circuit, the semiconductor switch being connected between an input terminal routed to a source and an output terminal of the load current circuit routed to a load. A control circuit is connected to a supply voltage and has a bridge circuit connected on the primary side to a transformer and to the supply voltage. A load circuit is connected to the transformer on the secondary side, the load circuit having a driver circuit for the semiconductor switch. A threshold value signal is routed to the bridge circuit on the control side. The bridge circuit generates a primary signal which is transmitted as a secondary signal to the load circuit that is galvanically isolated from the control circuit, and wherein the secondary signal is fed to the driver circuit, which generates a drive signal for the semiconductor switch.

A high voltage switch comprising: a high voltage power supply providing power greater than about 5 kV; a control voltage power source; a plurality of switch modules arranged in series with respect to each other each of the plurality of switch modules configured to switch power from the high voltage power supply, and an output configured to output a pulsed output signal having a voltage greater than the rating of any switch of the plurality of switch modules, a pulse width less than 2 s, and at a pulse frequency greater than 10 kHz.

A high voltage switch comprising: a high voltage power supply providing power greater than about 5 kV; a control voltage power source; a plurality of switch modules arranged in series with respect to each other each of the plurality of switch modules configured to switch power from the high voltage power supply, and an output configured to output a pulsed output signal having a voltage greater than the rating of any switch of the plurality of switch modules, a pulse width less than 2 s, and at a pulse frequency greater than 10 kHz.

Rectifiers are used in power systems, but surges are commonly encountered in the power grid, which can damage switches used to drive the active rectifiers. An active rectification system is proposed in which a thyristor type path is enabled through a transistor device such that surges bypass the driving switches.

A circuit may include a switching element configured to draw a positive current from a source/sink unit when the switching element is turned on, the source/sink unit including an inductance, the inductance emitting an excess positive current after the switching element is turned off. Additionally, the circuit may include a snubber circuit configured to absorb the excess positive current from the inductance of the source/sink unit, and deliver a negative current to the source/sink unit. In one example, the delivered negative current has a lower amperage and a longer duration than the positive current.

A method for controlling an electronic semiconductor switch connected in a load current circuit, the semiconductor switch being connected between an input terminal routed to a source and an output terminal of the load current circuit routed to a load. A control circuit is connected to a supply voltage and has a bridge circuit connected on the primary side to a transformer and to the supply voltage. A load circuit is connected to the transformer on the secondary side, the load circuit having a driver circuit for the semiconductor switch. A threshold value signal is routed to the bridge circuit on the control side. The bridge circuit generates a primary signal which is transmitted as a secondary signal to the load circuit that is galvanically isolated from the control circuit, and wherein the secondary signal is fed to the driver circuit, which generates a drive signal for the semiconductor switch.

A motor driving circuit for receiving a control signal to output at least one output current for driving a motor is provided. The motor driving circuit includes an input module, a gain module, an output module, a first slew rate limiting module, and a second slew rate limiting module. The first slew rate limiting module has a first limiting parameter. The second slew rate includes a second limiting parameter. An output current is outputted by the output terminal. When a rising slew rate of the output current is less than a first slew rate value, the first slew rate limiting module does not operate. When the rising slew rate of the output current is greater than the first slew rate value, the motor driving circuit limits the rising slew rate of the output current based on the first limiting parameter of the first slew rate limiting module.

A fan driving circuit includes a processing module providing a fan phase signal and a speed signal providing module electrically connected to the processing module and including a first switch having a first terminal, a second terminal receiving the fan phase signal and a third terminal electrically connected to a ground voltage, a second switch having a first terminal electrically connected to a speed signal providing terminal of the fan driving circuit and a first terminal of a first impedance, a second terminal electrically connected to a second terminal of the first impedance and a terminal of a diode, and a third terminal electrically connected to the first terminal of the first switch, and a third switch having a terminal electrically connected to a bias voltage.

A motor driving circuit includes a first output switch, a second output switch, a first adjusting module, and a second adjusting module. A rising slew rate of the first output current along the first direction is adjusted according to the first adjusting parameter of the first adjusting module. A falling slew rate of the first output current along the first direction is adjusted according to the second adjusting parameter of the second adjusting module.