A driver interface for a switch-based circuit includes an AC coupling capacitor, a first diode or a first series of diodes, and a second diode or a second series of diodes connected in series with the first diode or first series of diodes but with an opposing polarity. The AC coupling capacitor removes a DC voltage from an input bi-level drive signal that does not have the appropriate high and low drive levels needed to switch a FET in the switch-based circuit between fully ON and fully OFF states. The first diode or first series of diodes and the second diode or second series of diodes clamp the resulting AC-coupled drive signal to produce an output bi-level drive signal having the high and low drive levels needed to switch the FET between fully ON and fully OFF states. The driver interface maintains the high and low drive levels of the output bi-level drive signal irrespective of any changes made to the duty cycle or pulse density of the input bi-level drive signal.

A semiconductor device includes a galvanic isolator; a transmitting circuit that transmits a transmission signal via the galvanic isolator; a receiving circuit that receives a received signal corresponding to the transmission signal via the galvanic isolator; an encoding circuit that encodes two input signals and generates the transmission signal; and a decoding circuit that decodes the two input signals from the received signals.

A gate driver circuit comprises a gate-driver assembly, a transformer, first and second circuit voltage outputs, first and second switching devices, and a controller. The gate-driver assembly comprises a first and second voltage inputs and a first and second voltage outputs coupled to a primary winding of the transformer. The first and second switching devices are coupled to the secondary winding and respectively coupled to the first and second circuit voltage outputs. The controller is configured to cause the first circuit voltage output to supply a positive output voltage by supplying a higher first input voltage to the first voltage input than to the second voltage input and is also configured to cause the first circuit voltage output to supply a negative output voltage by supplying a higher second input voltage to the second voltage input than to the first voltage input.

A drive circuit driving a first switching element, including: a first diode with a cathode terminal connected to a first switching element gate terminal; a second switching element with a first terminal connected to a first diode anode terminal, a second terminal connected to a first switching element gate terminal, a third terminal connected to a first switching element source terminal; a third switching element with a drain terminal connected to the first diode anode terminal, and a source terminal connected to the first switching element source terminal; a parallel circuit; and a drive transformer having a coil, one end connected to the drain terminal, the other end connected to the third switching element gate terminal, and connected to the third switching element source terminal, one end of the parallel circuit connected to one coil end, the second diode cathode terminal connected to the other end of the coil.

A thin-film transistor (TFT) device may include a data line and a gate line formed on a base substrate, a TFT connected to the data line and the gate line, and a magnetic field antenna spaced apart from the data line and the gate line on the base substrate. The magnetic field antenna may be connected to the TFT and configured to transmit and receive a signal to and from the TFT or to control a driving of the TFT.

A driving circuit is a circuit selectively outputting one of a staircase wave and a square wave from an output terminal, to drive a capacitive load, and includes a first power source supplying a constant voltage VH, a first FET connected between the output terminal and the first power source, a first transformer in which an output side coil is connected to a gate of the first FET, a first input terminal connected to an input side coil of the first transformer via a capacitive element, a second power source supplying a constant voltage VL, a second FET connected between the output terminal and the second power source, a second transformer in which an output side coil is connected to a gate of the second FET, and a second input terminal connected to an input side coil of the second transformer via a capacitive element.

A device can include a first circuit configured to be exposed to a first environment, the first circuit comprising one or more first transfer inductors, and a second circuit isolated from the first circuit and configured to be exposed to a second environment, the second circuit comprising one or more second transfer inductors. The second environment can be a harsh environment. The first circuit and the second circuit can be wirelessly coupled via the one or more first transfer inductors and the one or more second transfer inductors to allow transfer of power and/or signals between the first circuit and the second circuit.

Due to increase of demand for safety of device, reinforcement of insulation of exposed conductive parts is required also in power conversion device. Relay unit having optical transmission unit, signal processing unit and power generating unit is provided between control circuit unit and gate drive circuit unit which form control device for an inverter. A gate signal generated in the control circuit unit is inputted into the signal processing unit of the relay unit through the optical transmission unit, and is outputted to the gate drive circuit unit from the signal processing unit through the optical transmission unit. Further, AC power is supplied to the power generating unit of the relay unit from a control device low-voltage AC power source through high-withstand voltage transformer. AC power is supplied to the gate drive circuit unit from the power generating unit of the relay unit through high-withstand voltage transformer.

Due to increase of demand for safety of device, reinforcement of insulation of exposed conductive parts is required also in power conversion device. Relay unit having optical transmission unit, signal processing unit and power generating unit is provided between control circuit unit and gate drive circuit unit which form control device for an inverter. A gate signal generated in the control circuit unit is inputted into the signal processing unit of the relay unit through the optical transmission unit, and is outputted to the gate drive circuit unit from the signal processing unit through the optical transmission unit. Further, AC power is supplied to the power generating unit of the relay unit from a control device low-voltage AC power source through high-withstand voltage transformer. AC power is supplied to the gate drive circuit unit from the power generating unit of the relay unit through high-withstand voltage transformer.

An electronic current-switching system comprising a driver unit and a current-switching device with one controlled transistor, a control unit coupled to said transistor, a power supply unit of the control unit and a digital communication bus transmitting to the control unit a first control signal of the driver unit. The power supply unit comprises: a transformer, an integrated circuit including a clock input coupled to a second output of the driver unit delivering a second control signal having the form of a pulsed signal with an adjustable duty cycle, and an output delivering to the transformer a primary voltage signal dependent on the second control signal, and a voltage divider bridge measuring the frequency-domain signal delivered by the transformer.