Rohm Co., Ltd.

Toshiyuki Ishikawa

Daiki Yanagishima

Hirotaka Takihara

Satoshi Kageyama

Isamu Nishimura

Michihiko Mifuji

Kosei Osada

Nobuyuki Kasahara

Tetsuya Kagawa

Makoto Ikenaga

Akio Sasabe

Yoshizo Osumi

An isolated gate driver has: a switch connection terminal configured to have a switching element externally connected to it; a non-volatile memory having adjustment data written to it; a register configured to store the adjustment data read from the non-volatile memory; a gate driving circuit configured to drive the gate of the switching element with a characteristic set based on a value stored in the register; and a control logic circuit configured to keep the gate driving circuit in a disabled state until completion of reading the adjustment data from the non-volatile memory and storing it in the register.

Isolated gate driver, traction inverter, and electric vehicle

The semiconductor device of the present invention includes an insulating layer, a high voltage coil and a low voltage coil which are disposed in the insulating layer at an interval in the vertical direction, a low potential portion which is provided in a low voltage region disposed around a high voltage region for the high voltage coil in planar view and is connected with potential lower than the high voltage coil, and an electric field shield portion which is disposed between the high voltage coil and the low voltage region and includes an electrically floated metal member.

Semiconductor device and semiconductor module

An isolated gate driver has: a register that stores the adjustment data read from a non-volatile memory; a gate driving circuit that drives the gate of a switching element with a characteristic set based on a value stored in the register; a fault detector that performs fault detection for other than the non-volatile memory; an error detection-correction circuit that performs error detection and error correction on the adjustment data written to the non-volatile memory; a first external terminal for output of the result of fault detection; a second external terminal for output of the result of error detection; and a fault controller that, if a one-bit error is detected in the adjustment data, brings the second external terminal into an error-indicating output state and continues with normal operation of the gate driving circuit and, if a two-or-more-bit error is detected in the adjustment data, forcibly stops the gate driving circuit.

A signal transmission device includes a signal transmission chip, and a first lead frame supporting the signal transmission chip. A first inductor spiral ring is on a surface of the signal transmission chip, a second inductor spiral ring is inside the signal transmission chip, a first bonding pad is electrically coupled between the first and second inductor spiral rings, a guard ring covers the first and second inductor spiral rings in a plan view, and bonding pads are outside of the guard ring. A direction of rotation between the first and second inductor spiral rings are different from each other. The signal transmission device further includes a semiconductor chip and a second lead frame supporting the semiconductor chip, wherein the signal transmission chip and the semiconductor chip face each other.

Signal transmission circuit device, semiconductor device, method and apparatus for inspecting semiconductor device, signal transmission device, and motor drive apparatus using signal transmission device

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.

Disclosed is a signal transmission circuit device () including a feedback signal transmission unit () that feeds back a control output signal (Sout) as a feedback signal (Sf) to an input side circuit (A). A logical comparison circuit () detects 'mismatch' between input and output by performing logical comparison between a control input signal (Sin) and the feedback signal (Sf). When a state of 'mismatch' between input and output occurs, a first pulse generating circuit () or a second pulse generating circuit () outputs a first correction signal (Sa) or a second correction signal (Sa) corresponding to a potential (high level or low level) of the control input signal (Sin), and corrects the control output signal (Sout) to the same potential (high level or low level) as the control input signal (Sin). With such configuration, the mismatch between input and output can be automatically corrected.

A signal transmission circuit which transmits N (N is a natural number of 2 or more) input signals includes a transmission signal generation portion, 2transmission portions and an output portion. The transmission signal generation portion generates 2transmission signals according to the N input signals. The 2transmission portions respectively transmit the 2transmission signals output from the transmission signal generation portion while performing electrical insulation. The output portion generates and outputs, based on the 2transmission signals transmitted by the 2transmission portions, N output signals that respectively indicate the N input signals. The transmission signal generation portion generates a pulse according to the N input signals and incorporates the pulse in only one of the 2transmission signals at the same time.

Signal transmission circuit and vehicle

A signal-transferring device having a first circuit and a second circuit that operate on different ground references, and a third circuit for transferring signals while providing insulation between the first circuit and the second circuit. The second circuit switches a logic level of an output signal in accordance with the logic level of an input signal notified by the first circuit, and notifies the first circuit about the logic level of the output signal. The first circuit notifies the second circuit about the logic level of the input signal not only when the logic level of the input signal has been switched, but also when the logic level of the output signal notified by the second circuit does not match the logic level of the input signal.

Signal transfer device

A signal transmission circuittransmits input signals INand INeach having a different transmission speed in a mutually electrically insulated manner. Signal transmission circuitincludes a pulse generation unit, transmission unitsand, a latch circuit, and an oscillation determination circuit. Transmission unitsandtransmit pulse signals PLS_A and PLS_B generated by pulse generation unitin accordance with logical states of input signals INand INto latch circuitand oscillation determination circuitin a mutually electrically insulated manner. Latch circuitrestores input signal INin accordance with rising edges of pulse signals PLS_A and PLS_B. Oscillation determination circuitrestores input signal INbased on oscillation states of pulse signals PLS_A and PLS_B. With such a configuration, a plurality of signals each having a different transmission speed can be transmitted in a mutually electrically insulated manner.

Signal transmission circuit, integrated circuit and electric device including thereof for transmitting a plurality of signals each having different transmission speed

A power semiconductor drive circuit device includes: an electronic control device generating a control input signal; a signal transfer circuit device having a main path and a self-diagnosis functional block; and a power semiconductor driven by the control output signal from the signal transfer circuit device. The self-diagnosis functional block includes: a feedback pulse transmitter circuit; a second signal transfer circuit; and a second receiver circuit. The second receiver circuit compares the control output signal with the control input signal so as to find out whether the control output signal is matched or unmatched with the control input signal, and then outputs a result to a comparison signal output terminal. A signal outputted to the comparison signal output terminal is transferred to the electronic control device.

Growing community of inventors

Kyoto, Japan

Toshiyuki Ishikawa