Rohm Co., Ltd.

Denso Corporation

Japan Science and Technology Agency

Daiki Yanagishima

Toshiyuki Ishikawa

Akio Sasabe

Hirotaka Takihara

Satoshi Kageyama

Isamu Nishimura

Michihiko Mifuji

Kosei Osada

Tetsuya Kagawa

Nobuyuki Kasahara

Masato Nishinouchi

Takeshi Kikuchi

Masanori Tsuchihashi

Junichi Hasegawa

Masahiko Arimura

Yoshizo Osumi

Yoshiteru Maeno

Kazuma Takahashi

Yusuke Michisita

Tsuyoshi Fukura

Chinatsu Nakaoka

A signal transmission device that transmits a driving signal for a power transistor from a primary circuit system to a secondary circuit system while isolating between the primary and secondary circuit systems includes: a first fault detection circuit configured to detect a fault in the primary circuit system; a second fault detection circuit configured to detect a fault in the secondary circuit system; a first signal transmission path configured to transmit the result of detection by the second fault detection circuit from the secondary circuit system to the primary circuit system while isolating between the primary and secondary circuit systems; and a self-test circuit configured to perform a self-test on each of the first fault detection circuit, the second fault detection circuit, and the first signal transmission path.

Signal transmission device, electronic device and 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

A signal transmission device transmits a driving signal for a gate-driving transistor between a primary circuit system and a secondary circuit system while isolating between the primary and secondary circuit systems. The signal transmission device includes: a first external terminal configured such that the ground terminal of the secondary circuit system is connected to it; a second external terminal configured such that the terminal voltage at it varies according to whether the first external terminal is in an open state; and an open detection circuit configured to monitor the terminal voltage at the second external terminal to perform open detection for the first external terminal.

Signal transmission device, electronic device, and vehicle

A signal transmission deviceincludes an isolated signal transmission circuitconfigured to transmit a pulse signal from a primary circuit systemvia a first isolating element ISOto a secondary circuit system, and an isolated power supply control circuitwhich serves as a controlling agent of an isolation-type power supply that generates a second supply voltage Vccfor the secondary circuit systemfrom a first supply voltage Vccfor the primary circuit systemand which transmits an output feedback signal of the isolation-type power supply from the secondary circuit systemvia a second isolating element ISOto the primary circuit system

Signal transmission device, electronic appliance, and vehicle

A pulse receiving circuit constituting a signal transmission device includes a first pulse detector that receives a differential input between a first reception pulse signal, i.e. an internal signal at a secondary winding of a first transformer and a second reception pulse signal, i.e. an internal signal at a secondary winding of a second transformer; a second pulse detector that receives the differential input between the first reception pulse signal and the second reception pulse signal with input polarity reversed to that of the first pulse detector; and a logic unit that generates a reception pulse signal based on output signals of the first and second pulse detectors, respectively.

Pulse receiving circuit and signal transmission device

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

In a transmission circuit, a first pulse signal with a first frequency and a second pulse signal with a second frequency are output according to a rising edge and a falling edge of a first input signal, respectively. When a second input signal indicates an active level, the second pulse signal is output according to the falling edge of the first input signal and the second frequency is changed to a third frequency. In a reception circuit, a first level of a first output signal is changed to a second level according to a first induced signal via a transformer, the second level of the first output signal is changed to the first level according to a second induced signal via the transformer, and a second output signal is changed to an active level when a frequency of the second induced signal has changed to the third frequency.

Signal transmission apparatus

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 switch drive circuit for driving a switching device includes an overcurrent detector which detects an overcurrent passing through the switching device, and a voltage controller which applies a control voltage to the switching device to control the switching device between On and Off states. When the overcurrent detector detects an overcurrent, the voltage controller applies to the switching device a control voltage that initially drops to a predetermined voltage higher than the threshold voltage of the switching device and that then, after the lapse of a predetermined time, drops further to the ground potential of the switch drive circuit to turn off the switching device. When the overcurrent detector detects no overcurrent, the voltage controller applies to the switching device a control voltage that drops, before the lapse of the predetermined voltage, to the ground potential of the switch drive circuit to turn off the switching device.

Growing community of inventors

Kyoto, Japan

Daiki Yanagishima