Mitsubishi Denki Kabushiki Kaisha

Nihon Kohden Corporation

Other

Mitsubishi Electric Corporation

Hiroshi Sakata

Hidehiro Hosaka

Fumiyuki Matsumura

Tetsushi Sekiguchi

Toru Araki

Yoshihiro Sugo

Kohei Ono

Akihisa Yamamoto

Toru Iwagami

Masanori Fukunaga

Shin Suda

Tooru Iwagami

Yoshimasa Ito

Mitsutaka Hano

Takeshi Sohma

Hiromitsu Kasuya

Tomofumi Tanaka

Eiichiro Takemasa

Shinya Shirakawa

Katsuhiko Namiki

Toshihiro Ichihashi

Shigeru Aso

Kouichi Shiroyama

Yasunori Kurihara

A gate drive circuit of the present invention is a gate drive circuit for driving an insulated gate switching element, which comprises a control drive circuit for applying a driving voltage to a control terminal of the switching element at a predetermined timing, and a voltage monitoring circuit for monitoring both a first voltage which is a power supply voltage of the control drive circuit and a second voltage which negatively biases the control terminal of the switching element, and in the gate drive circuit, the control drive circuit cuts off an output when at least one of the first and second voltages monitored by the voltage monitoring circuit becomes lower than a threshold value. It is an object of the present invention to provide an insulated gate switching element which can suppress wrong ON.

Gate drive circuit

A biological signal detection system includes a pair of electrodes, adapted to be attached on a living body; a transmitter, adapted to be attached on the living body, and including an electric circuit operable to process the biological signal and to telemeter the processed signal; and a biological signal inputting apparatus. The system may also include a receiver-transmitter operable to receive the processed signal telemetered from the transmitter and to telemeter the processed signal to the biological signal inputting apparatus by way of a wide area network; and a storage for storing the processed signal telemetered from the transmitter as biological signal data and for inputting the biological signal data to the biological signal inputting apparatus. Also, the system may include a storage for storing the processed signal telemetered from the transmitter as biological signal data and for inputting the biological signal data to the biological signal inputting apparatus.

Biological signal detection system

As devices are often different in the characteristics from one another, semiconductor chips based on the devices have discrepancies in the performance. A semiconductor device having a semiconductor switching element and a drive controlling means () for generating from input signals (A) and (B) drive signals (a) and (b) to control the action of the semiconductor switching element is provided comprising a characteristic compensating means () for generating from a characteristic compensation input signal a compensation signal to eliminate variations in the transmission delay time of the drive controlling means ().

Semiconductor device

A control output signal is supplied to a gate electrode of an insulated gate transistor from a control signal output terminal of a control device, however, with regard to the insulated gate transistor, a control output signal is also influenced when that transistor is short-circuited, and a signal waveform different from that in a normal operating state occurs. The short-circuit is detected by monitoring the control output signal of the insulated gate transistor, and in case of the short-circuit, the short-circuit protection of the insulated gate transistor is performed by forcing the control device to stop that control output signal.

Semiconductor device which realizes a short-circuit protection function without shunt resistor, and semiconductor device module

An electrodefor detecting a biological signal and a loop antennaare integrally mounted on a supportplaced on the surface of a living body and a transmitteris placed on the support. A biological signal detected on the electrodeis input through a connectorto electric circuitryof the transmitterand an electric signal processed by the electric circuitryis output through connectorsandto both ends of the loop antennafrom which the biological signal is emitted to a receiver. At this time, the opening face of the loop antennais in a direction almost perpendicular to the surface of a living body for improving sensitivity.

Biological signal transmission apparatus

A pulse generation part outputs a first ON pulse signal for turning a switching device on to a control part on based on the leading edge of a signal from the outside of a semiconductor device. The pulse generation part subsequently outputs a second ON pulse signal for turning the switching device on to the control part based on the same leading edge of the signal as the first ON pulse signal after a lapse of prescribed time after outputting the first ON pulse signal. Even if the control part cannot output an ON signal to the switching device based on the first ON pulse signal, the control part can output an ON signal based on the second ON pulse signal.

Driving circuit and semiconductor device

A comparator compares the voltage of a shunt resistor, detected by a current detection terminal, with a reference voltage and supplies a current abnormality signal to a fault circuit when the voltage of the shunt resistor is in excess of the reference voltage. A stop signal is then supplied to a power device driving circuit and an input circuit. In response to the received stop signal, the power device driving circuit and another power device driving circuit stop operation of transistors respectively. The fault circuit, which is capable of outputting the stop signal through a fault terminal, is also able to receive a stop signal output from another control circuit and supply the stop signal to the power device driving circuit and the input circuit. Thus, the circuitry of an inverter module having a protective function is simplified, and the module is able to be miniaturized.

The module-type connector according to the present invention defines the connectable connectors with a rigid supporting plate which extends along the connecting direction in order to make it easy to properly fit a male connector to a female connector. In the module-type connector, the contacting portions of the contacts that are shifted in the separation direction of the corresponding terminal with which the contacting portions contact are almost uniformly distributed. Further, the male connector that receives a preliminary load from different levels in the direction so that opposing elastic contacting portions are widened by engaging between the first end portion of each contact within a housing and the different levels of the housing, has at least a protruding portion that protrudes from the contacting surface of the plurality of contacts toward the contacting surface thereof and that is provided between contacts.

Modular connector assembly

In an interface between a high-active driving circuit for driving a predetermined semiconductor power element and a microcomputer for controlling an output signal of the driving circuit, the microcomputer comprises a transistor, a collector terminal of which is an output side of the microcomputer; and the driving circuit comprises a first resistor, one end of which is directly connected with the output side of the microcomputer; a Schmidt circuit which is connected in series with the other end of the first resistor; a diode, an anode side of which is connected to a path between the first resistor and the Schmidt circuit; a power supply voltage connected with a cathode side of the diode; and a second resistor, one end of which is grounded and the other end of which is connected with a side of the first resistor being an input terminal of the driving circuit.

Interface

An electrode for detecting a biological signal and a loop antenna are integrally mounted on a support placed on the surface of a living body and a transmitter is placed on the support . A biological signal detected on the electrode is input through a connector to electric circuitry of the transmitter and an electric signal processed by the electric circuitry is output through connectors and to both ends of the loop antenna from which the biological signal is emitted to a receiver. At this time, the opening face of the loop antenna is in a direction almost perpendicular to the surface of a living body for improving sensitivity.

A sensor device a sensor unit which detects a biomedical signal, and a transmitter which converts the biomedical signal into a radio signal and then transmits the radio signal. The transmitter has an electrode detachment detection unit 12 which detects electrode detachment on the basis of an output of the sensor unit, and transmits an electrode detachment signal indicative of the detachment. In a receiver, the biomedical signal transmitted from the transmitter is received, the signal is attenuated by an attenuation unit, and the attenuated signal is supplied to a wired sensor input portion of another device through a switch and a connection unit. In the receiver, when the electrode detachment signal is detected from the signal transmitted from the transmitter, the switch is turned off.

Medical telemetery system, and a sensor device and a receiver for the same

An electrode 4 for detecting a biological signal and a loop antenna 3 are integrally mounted on a support 2 placed on the surface of a living body and a transmitter 5 is placed on the support 2. A biological signal detected on the electrode 4 is input through a connector 11 to electric circuitry 10 of the transmitter 5 and an electric signal processed by the electric circuitry 10 is output through connectors 12 and 13 to both ends of the loop antenna 3 from which the biological signal is emitted to a receiver. At this time, the opening face of the loop antenna 3 is in a direction almost perpendicular to the surface of a living body for improving sensitivity.

A comparison circuit (4) is formed by a Schmidt buffer (4a) which has first and second threshold values and a buffer (4b) whose threshold value is larger than the first threshold value but smaller than the second threshold value. An integrating circuit (3) and the comparison circuit (4) function as a timer circuit which operates in accordance with comparison of the three values. An input signal (IN) decreases from a reference voltage signal (V6). A control signal becomes an H level after a time which is determined by a time constant of the integrating circuit (3) and the threshold value of the buffer (4b), and a detect signal (FO) is outputted after a time which corresponds to a difference between the second threshold value and the threshold value (which is equal to or shorter than a response time of the circuit (4)). During monitoring of a d.c. voltage which is applied to a drive circuit of a semiconductor element by means of a hysteresis operation, chattering of the detect signal is prevented which otherwise occurs despite an unstable hysteresis operation within a monitoring circuit when the d.c. voltage varies above and below a set value in a short period of time.

Growing community of inventors

Tokyo, Japan

Hiroshi Sakata