A signal transmission device includes a first lead frame supporting a signal transmission chip that includes first and second inductor spiral rings, a first bonding pad electrically coupled between the first and second inductor spiral rings, and a guard ring provided to roundly cover the first and second inductor spiral rings in a plan view. Bonding pads are provided outside of the guard ring. A direction of rotation between the first and second inductor spiral rings are different from each other so that the first and second inductor spiral rings are disposed substantially symmetrically about the first bonding pad. A second lead frame supports a semiconductor chip, with the signal transmission chip and the semiconductor chip facing each other.

A signal transmission device includes a first lead frame supporting a signal transmission chip that includes first and second inductor spiral rings, a first bonding pad electrically coupled between the first and second inductor spiral rings, and a guard ring provided to roundly cover the first and second inductor spiral rings in a plan view. Bonding pads are provided outside of the guard ring. A direction of rotation between the first and second inductor spiral rings are different from each other so that the first and second inductor spiral rings are disposed substantially symmetrically about the first bonding pad. A second lead frame supports a semiconductor chip, with the signal transmission chip and the semiconductor chip facing each other.

The present invention relates to a heating device for a motor vehicle with a dual-voltage vehicle electrical system. The heating device is operated with a power supply from the sub-system with the higher nominal voltage (for example 48 V), but actuated by a control device in the sub-system with the lower nominal voltage (for example 12 V). For this purpose, the heating device has a supply connection in the sub-system with the higher nominal voltage and a control connection in the sub-system with the lower nominal voltage. The control connection is disposed in particular on a control device which is integrated into the heating device and which is connected to a control connection of a switching element (power semiconductor) for controlling the heating device via a capacitive separating element in order to ensure potential isolation of the two sub-systems.

A power device driving apparatus drives a plurality of power devices including first and second power devices. In the apparatus, a plurality of drive circuits are separately provided for at least the first power device and the second power device and output drive signals to the respective power devices. The isolated power supply includes a first isolated power supply unit that supplies a first supply voltage, and a second isolated power supply unit that supplies a second supply voltage that is different from the first supply voltage. The plurality of drive circuits includes a first drive circuit that uses the first supply voltage supplied from the first isolated power supply unit to output the drive signal to the first power device, and a second drive circuit that uses the second supply voltage supplied from the second isolated power supply unit to output the drive signal to the second power device.

A power device driving apparatus drives a plurality of power devices including first and second power devices. In the apparatus, a plurality of drive circuits are separately provided for at least the first power device and the second power device and output drive signals to the respective power devices. The isolated power supply includes a first isolated power supply unit that supplies a first supply voltage, and a second isolated power supply unit that supplies a second supply voltage that is different from the first supply voltage. The plurality of drive circuits includes a first drive circuit that uses the first supply voltage supplied from the first isolated power supply unit to output the drive signal to the first power device, and a second drive circuit that uses the second supply voltage supplied from the second isolated power supply unit to output the drive signal to the second power device.

The electromagnetic coupler uses a coil to induce voltage onto a transistor. By controlling the amount of current that flows through the coil, one is able to can control the strength of the magnetic field emitted by the inductor. And by the controlling the q-point of the transistor, the amount voltage and current induced onto the transistor it can then potentially be used as a switch or an amplifier without any electrical/electronic connection to the internal coil. The use of a transistor enables high speed switching and the potential amplification of communication signals.

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.

A power device driving apparatus drives a plurality of power devices including first and second power devices. In the apparatus, a plurality of drive circuits are separately provided for at least the first power device and the second power device and output drive signals to the respective power devices. The isolated power supply includes a first isolated power supply unit that supplies a first supply voltage, and a second isolated power supply unit that supplies a second supply voltage that is different from the first supply voltage. The plurality of drive circuits includes a first drive circuit that uses the first supply voltage supplied from the first isolated power supply unit to output the drive signal to the first power device, and a second drive circuit that uses the second supply voltage supplied from the second isolated power supply unit to output the drive signal to the second power device.

A power device driving apparatus drives a plurality of power devices including first and second power devices. In the apparatus, a plurality of drive circuits are separately provided for at least the first power device and the second power device and output drive signals to the respective power devices. The isolated power supply includes a first isolated power supply unit that supplies a first supply voltage, and a second isolated power supply unit that supplies a second supply voltage that is different from the first supply voltage. The plurality of drive circuits includes a first drive circuit that uses the first supply voltage supplied from the first isolated power supply unit to output the drive signal to the first power device, and a second drive circuit that uses the second supply voltage supplied from the second isolated power supply unit to output the drive signal to the second power device.