A switch device is described, formed by: a first switch MOS transistor, with its drain terminal connected to a first switch terminal, source terminal connected to an internal source node and gate terminal connected to an internal gate node; a second switch MOS transistor, with its drain terminal connected to a second switch terminal, source terminal connected to the internal source node and gate terminal connected to the internal gate node; and a voltage limiting element connected between the internal gate and source nodes. A driving stage, voltage-referred to the internal source node, drives the switching of the bidirectional switch, as a function a first and a second driving signals, and has a driving transistor and a switching transistor connected to each other in inverter configuration.

An electromagnetic encoding switch and a method for calculating rotation information of a runner. The electromagnetic encoding switch (10) comprises: a runner assembly (11), wherein the runner assembly (11) comprises an LC resonant circuit (111), the LC resonant circuit (111) comprising an inductor L and a capacitor C connected to the inductor L, the inductor L having a magnetic core, and the inductor L being used for receiving and transmitting electromagnetic waves; a runner (112), the LC resonant circuit (111) being disposed on the runner (112); a transceiver unit (12), the transceiver unit (12) comprising an antenna (121) disposed below the runner (112) and used for transmitting electromagnetic waves at a preset frequency in a transmitting period, so that the LC resonant circuit (111) receives energy in the transmitting period; and an antenna selection switch (122) connected to the antenna (121). The electromagnetic encoding switch (10) has no mechanical noise and is low-cost.

A device including a first and second monitoring unit, the first monitoring unit detecting a first voltage potential and the second monitoring unit detecting a second voltage potential, the monitoring units comparing the first voltage potential and the second voltage potential to the value of the supply voltage and activate a control unit as a function of the comparisons, the control unit determining a switching point in time of a second power transistor, and an arrangement being present which generates current when the second power transistor is being switched on, the current changing the first voltage potential, and the control unit activates a first power transistor when the first voltage potential has the same value as the supply voltage, so that the first power transistor is de-energized.

In accordance with an embodiment, a method of operating a switching transistor includes turning-off the switching transistor by transferring charge from a gate-drain capacitance of the switching transistor to a charge storage device, and turning-on the switching transistor by transferring charge from the charge storage device to a gate of the switching transistor. Turning off the switching transistor includes hard-switching and turning-on the switching transistor includes soft-switching.

A switching system includes a control circuit that receives On-Off signals indicative of a desired operating state of a switch. The control circuit includes an oscillator that generates a first electrical pulse responsive having a first signal characteristic or a second signal characteristic that is determined by the received On-Off signal, which may be related to a frequency or duty cycle of the pulse. A pulse transformer connected to the oscillator receives the first electrical pulse and outputs a second electrical pulse having the same one of the first signal characteristic and the second signal characteristic as the first electrical pulse. A pulse detection circuit in the control circuit receives the second electrical pulse, determines whether the second electrical pulse has the first signal characteristic or the second signal characteristic, and controls transmission of power and control signals to the switch based on this determination.

A device including a first and second monitoring unit, the first monitoring unit detecting a first voltage potential and the second monitoring unit detecting a second voltage potential, the monitoring units comparing the first voltage potential and the second voltage potential to the value of the supply voltage and activate a control unit as a function of the comparisons, the control unit determining a switching point in time of a second power transistor, and an arrangement being present which generates current when the second power transistor is being switched on, the current changing the first voltage potential, and the control unit activates a first power transistor when the first voltage potential has the same value as the supply voltage, so that the first power transistor is de-energized.

The present application is directed to drive arrangement for semiconductor switches and in particular to a method of driving the gate of a switch with pulses corresponding to turn-on and turn-off commands through separate turn-on and turn-off transformers. The application provides a fail safe reset feature, a more efficient turn-on circuit and an energy recovery circuit for recovering energy from the gate upon turn-off. The application also provides a novel arrangement for assembling multiple pulse transformers on a circuit board.

The present invention relates to a voltage regulator and a resonant gate driver of the voltage regulator, where the resonant gate driver is configured to drive a first power transistor and a second power transistor and includes: a first control gateway, a second control gateway, and an inductor, where: a first end of the first control gateway is connected to a first end of the second control gateway; a second end of the first control gateway is connected to a second end of the second control gateway by using the inductor; and a third end of the first control gateway is connected to the first power transistor, and a third end of the second control gateway is connected to the second power transistor. The resonant gate driver according to an embodiment of the present invention can reduce a driving period and increase a response speed.

With the stabilized direct-current power supply utilizing the resonance circuit driven by the carrier, the output of the resonance circuit is rectified and smoothed to produce the output voltage of the power supply. The output voltage of the power supply being fixed, the amplitude and the frequency of the carrier driving the resonance circuit is mutually related.

There is an optimal frequency of the carrier where the power supply becomes efficient. The optimal frequency depends on the magnitude of the load connected to the output of the power supply. So the power supply feeds the output current to the amplitude on the basis of the mutual relation so as to makes the frequency of the carrier follow the optimal frequency.

Implementation of the priactical PWM controller provided with both the frequency modulation input and the amplitude modulation input is configured. The error voltage, which is the voltage difference between the output voltage and the reference voltage of the power supply, is fed back to both the frequency and the amplitude of the carrier. Integral of the error voltage is fed back to the frequency through the frequency modulation input of the PWM controller, which stabilizes the feedback to the frequency. Proportional of the error voltage and the output current of the power supply is fed back to the amplitude through the amplitude modulation input. The output current, considered to be differential of the output voltage and then the error voltage, sets the base line of the amplitude which is modulated by the proportional of the error voltage. The mutual rekation control the base line of the amplitude so that the frequency of the carrier can track the optimal frequency.

In accordance with an embodiment, a method of operating a switching transistor includes turning-off the switching transistor by transferring charge from a gate-drain capacitance of the switching transistor to a charge storage device, and turning-on the switching transistor by transferring charge from the charge storage device to a gate of the switching transistor. Turning off the switching transistor includes hard-switching and turning-on the switching transistor includes soft-switching.