Denso Corporation

Nippondenso Co., Ltd.

Haruo Kawakita

Koji Ando

Takamoto Watanabe

Naoto Okabe

Norihito Tokura

Seiki Aoyama

Naohito Kato

Yutaka Tomatsu

Yoshihiko Ozeki

Yoshiyuki Miyase

Takashi Ohno

Mitsunobu Niwa

Takashi Oono

Yasuo Ishihara

Mitsuyasu Enomoto

An ignition coil includes a coil portion and an igniter. The coil portion has a primary coil, a secondary coil, and a coil case. The primary coil and the secondary coil are disposed in the coil case. The igniter is disposed on one end side of the coil portion. The igniter includes a metallic frame connected to a voltage source at a constant potential, and a semiconductor integrated chip disposed on the metallic frame. The semiconductor integrated chip has a control circuit for controlling a switching element. The control circuit is formed by a dielectric isolation method. A surface of the semiconductor integrated chip on a silicon substrate-side is opposed to the metallic frame.

Ignition coil

A resin-sealed semiconductor device includes a metal frame, an electronic substrate, an adhesive agent, a molded resin, and a bonding agent. The electronic substrate includes a first surface having a circuit element wiring part, a second surface facing the metal frame, and a side surface arranged approximately perpendicularly to the first surface and the second surface. The adhesive agent is disposed between the metal frame and the second surface to cover the second surface and a portion of the side surface adjacent to the second surface. The molded resin covers the metal frame and the electronic substrate, and holds the other portion of the side surface adjacent to the first surface. The bonding agent is disposed between the circuit element wiring part and the molded resin so that the molded resin holds the circuit element wiring part through the bonding agent.

Resin-sealed electronic device and method of manufacturing the same

In an engine ignition system, an igniter for an ignition coil is connected to an ECU through a signal wire. The signal wire is grounded via the collector and the emitter of a bipolar transistor of an output circuit of the igniter. A constant current source outputs a current to the base of the bipolar transistor. Switching transistors are connected between the emitter and base of the bipolar transistor. When all the switching transistors are turned off, the bipolar transistor is turned on.

Output circuit for an on-vehicle electronic device

Semiconductor equipment includes: a first lead frame having a first semiconductor device; a second lead frame having a second semiconductor device; a thermal resistor for preventing heat transfer from the first lead frame to the second lead frame; and a temperature sensitive device for detecting operational temperature of the first semiconductor device. The first lead frame is separated from the second lead frame by a predetermined distance. The thermal resistor is disposed in a clearance between the first lead frame and the second lead frame. The second semiconductor device controls to restrict operation of the first semiconductor device when the operational temperature of the first semiconductor device is higher than a predetermined temperature.

Semiconductor equipment having multiple semiconductor devices and multiple lead frames

A power switching control device for electric systems such as an ignition device for internal combustion engines has a control circuit IC and a switching IC. A temperature sensor is provided in the switching IC. The control circuit IC is joined to a grounding terminal through a conductive layer provided therebetween. Thus, the substrate potential of the control circuit IC is stabilized to the ground potential so that the temperature sensor is prohibited to operate erroneously due to electromagnetic noise.

Power switching control device for electric systems

An ignition system for an internal combustion engine is connected to an ignition coil and to a circuit for providing an ignition signal. The ignition system includes a switch circuit connected to the ignition coil that switches on or off current supplied to the ignition coil, a control circuit that controls the switch circuit based on the ignition signal and a protection circuit that includes a pair of back-to-back connected zener diodes connected between the input terminal of the control circuit and a ground.

Engine ignition system having noise protection circuit

An ignition device for an internal combustion engine includes a power transistor connected to a primary coil of an ignition coil, a current sensing resistor connected in series with the power transistor, a constant current circuit and an abnormal oscillation control circuit that connects the gate resistor with the feedback circuit when the constant current circuit controls the primary current to be constant. The constant current circuit has a gate resistor connected in series to the control gate of the power transistor and a feedback circuit connected between the gate resistor and the current sensing resistor and controls current supplied to a control gate of the power transistor so as to control the primary current to be constant.

Ignition device for internal combustion engine

An ignition control apparatus for an internal combustion engine of the present invention has a switching circuit and a control circuit. The switching circuit includes a first switch controlling a main current constituting the most portion of the coil current, a second switch controlling a sensing current constituting the coil current together with the main current; and a temperature sensor detecting temperatures of the first and the second switches, which are realized by semiconductors. The control circuit, which is heat-isolated from the switching circuit, includes a current limiting circuit operating the first switch and the second switch to adjust the coil current to a predetermined value based on the sensing current, and a thermal shutoff circuit turning off both the first switch and the second switch when the temperature detected by the temperature sensor exceeds a predetermined threshold value.

Ignition control apparatus for internal combustion engine

In a semiconductor device of the present invention, a first semiconductor region is formed so that a peripheral edge thereof is located between a first field plate ring that corresponds to one of field plate rings located at the innermost side thereof and a second field plate ring that corresponds to one of the field plate rings adjacent the first plate ring. Accordingly, when a surge voltage is applied to the semiconductor device of the present invention, an electric field concentration at a part of the isolation film located under the first one of the field plate rings is relaxed and an electric field intensity decreases. Therefore, the reliability of the isolation film for withstanding the surge voltage increases.

Semiconductor device with peripheral portion for withstanding surge voltage

An IGBT having a buffer layer for shortening the turn-off time and for preventing the latching up is improved. The buffer layer of the present invention is not bare at the edge of a diced cross-section of the IGBT chip. According to this construction, a withstanding voltage between a semiconductor substrate and the buffer layer is lower than the withstand voltage of the pn junction at the edge of the diced cross-section. Therefore, the whole pn junction between the semiconductor substrate and the buffer layer, which has wide area, breaks down, as a result, energy caused by a negative voltage is absorbed, and the withstanding voltage against the negative voltage is improved.

Insulated gate bipolar transistor and method of fabricating the same

A semiconductor device has an electrode interposed between an interlayer insulation film and a wire which is bonded thereto. A main component of the electrode is aluminum and the electrode contains fine-grained silicon in a concentration of 0.1 to 0.6 weight %. As a result, even if large ultrasonic power, a large load or the like is applied to the electrode when the wire is wire-bonded, damage such as the formation of a crack hardly generates at the interlayer insulation film. Therefore, the occurrence of defects due to the wire-bonding can be reduced.

Semiconductor device and method of manufacturing same

A rotational position detecting sensor such as a cylinder discriminating sensor, which is capable of detecting the rotational position of a rotor from immediately after the rotor starts to rotate as at an engine start, arranged such that when used as a cylinder discriminating sensor using a rotor for cylinder discrimination having a tooth formed around a semicircular portion thereof and a groove formed around another semicircular portion thereof, at an engine start, a binary output DO is set forcedly regardless of the positional relation between the rotor and the pick-up means, and then, if a difference Sn=Di-Dr as a result of comparison between the magnetic output Di resulting from rotation of the rotor and a reference value Dr is equal to and larger than 0, the difference most significant bit signal Sn(MSB) is set to '0', or if the difference Sn is less than 0, the Sn(MSB) is set to '1', and if the difference signal Sn is larger than a hysteresis width HYS, the binary output DO is set again, and when the signal is not inverted in the first setting again of this signal, a counter inverted signal -CT is output in a short artificial pulse, and if the signal is inverted, the binary output DO is output as the rotational position signal SO.

Rotational position detector having initial setting function

An object of the present invention is to provide an A/D conversion device capable of compensating for quantizing errors occurring as a result of variations in operating conditions and a physical quantity detection device using this A/D conversion device. In a physical quantity detection device, pulse signals CKA and CKB, having frequencies which change in response to a change in magnetic strength, are caused to be output from oscillators 16 and 18, with counter/decoder sections 22 and 24 generating, from each of these pulse signals CKA and CKB, pulse signals PA and PC, and a pulse signal PB having a phase difference with respect to pulse signal PA which varies in a prescribed manner in response to the oscillation frequency of oscillator 16, the phase difference between pulse signals PA and PC and the phase difference between pulse signals PA and PB each being quantized by a pulse phase difference encoding circuit 30, with the ratio DD (=DB/DD) between the quantized digital values DC and DB being determined by a divider 50, and a detection signal PO, which represents the magnetic change being detected from this value DD, being generated.

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Okazaki, Japan

Haruo Kawakita