Hitachi, Ltd.

Renesas Technology Corp.

Hitachi Electronics Engineering Co., Ltd.

Densei Lambda K.k.

Hideho Yamamura

Naoki Maru

Shigeo Oomae

Koji Nisisu

Kazunori Nakajima

Shinichi Hayashi

Kenji Takeda

Fumiyuki Kobayashi

Hideo Arima

Satoshi Muraoka

Masakazu Yamamoto

Satoshi Tomioka

Nobuya Niizaki

Mamoru Ogihara

Takashi Saitoh

Motoharu Ueguri

This invention prevents a deterioration of efficiency of a power supply apparatus due to a semiconductor power supply voltage drop, prevents an increase in wasted power, and prevents erroneous operations due to feeder wire voltage drop. In the mounting structure of electronic circuits having a plurality of busbars as current paths on a printed circuit board, the plurality of busbars have almost parallel portions spaced a predetermined distance apart; a span of the parallel portions of the plurality of busbars is greater than the predetermined distance; and in the parallel portions of the plurality of busbars, the plurality of busbars are connected by a wiring pattern. In the switching power supply apparatus built on a printed circuit board, with its output voltage of less than 2 V and its output current of more than 100 A, a means is provided for making the power efficiency higher than 70%.

Electronic circuit structure, power supply apparatus, power supply system, and electronic apparatus

An over voltage detection circuit, which is used in a power source, a power supply system, and an electronic apparatus, includes two voltage comparison circuits. A first comparison circuit, provided for high-speed signal responses, includes voltage dividing resistors, a voltage comparator, and a reference voltage source, while a second comparison circuit, provided for low-speed signal responses, includes voltage dividing resistors, a capacitor, a voltage comparator, and a reference voltage source. The second comparison circuit, which has the capacitor, is for low-speed-signal responses and does not respond to high-speed input changes, that is, high-frequency components. The first comparison circuit, which has no capacitor, responds to any frequency components including high-speed signals and high frequency components. A high setting voltage is selected for the first comparison circuit, while a low setting voltage for the second comparison circuit.

Over voltage detection circuit, and power source circuit, power supply system and electronic apparatus using the over voltage detection circuit

In a redundant configuration with multiple power sources connected in parallel to enhance reliability, a power source in which an overvoltage failure occurred has been difficult to identify and unable to be deactivated, which has impeded the improvement of reliability. However, it has become possible to deactivate selectively only the power source in which an overvoltage failure has occurred, by providing a independency-discrimination circuit that identifies the occurrence of the overvoltage failure by use of the state of a parallel operation control circuit, and connecting the independency-discrimination circuit, an overvoltage detection circuit, and a connection circuit.

Overvoltage protection circuit, and power source, power supply system and electronic apparatus using the overvoltage protection circuit

A BGA type semiconductor device which realizes its high speed operation and high integration density by shortening power supply or grounding wires to reduce its inductance. In the BGA type semiconductor device, the power supply or grounding wires are provided in the vicinity of the center of a BGA board to realize the high-speed operation and high integration density, whereby an electronic circuit or equipment using the BGA type semiconductor device can be made high in operational speed and made sophisticated in function.

BGA type semiconductor device and electronic equipment using the same

In the current detection circuit that detects the output currents of a switching power supply circuit, an improved current detection circuit makes it possible to detect the output current directions of power supplies solves the malfunction of the power supplies vibrating or diverging during changes in load state and during parallel operation, and thus implements stable operation. The direction of an output current Ican be detected by using the current detection circuitthat has multiple switching elements Sto Seach operating synchronously with an inverter circuit.

Current detection circuit, and power supply apparatus, power supply system and electronic apparatus using the current detection circuit

A parallel power system is provided which can flexibly change output currents and the number of channels in short time and at low cost. A back board of the parallel power system has connectors ECC and DCC for plug-in mounting power source circuits to and an electronic circuit . Terminals of the connectors DCC and EDC are connected by wiring lines HP. The power source circuits to constitute a first voltage channel by a power source line DH and a parallel operation control line PCH of the electronic circuit , whereas the power source circuits to constitute a second voltage channel by a power source line DH and a parallel operation control line PCH . When a specification of the electronic circuit is to be changed, only the power source lines DH and DH and parallel operation control lines PCH and PCH are changed without changing the back board and the like.

Parallel power system and an electronic apparatus using the power system

An electronic circuit device having a power wiring resonance inhibition function includes a plurality of electronic circuit elements, and a wiring board having the electronic circuit elements disposed thereon. The wiring board includes a plurality of planar power supply wires for supplying power to the electronic circuit elements. The planar power wires include a pair of planar power supply wires for supplying power to the electronic circuit elements at a predetermined voltage. The electronic circuit device also includes a plurality of damping elements disposed at a plurality of positions on the wiring board. The damping elements are connected between the pair of planar power supply wires at a plurality of positions on the pair of planar power supply wires. The damping elements reduce power supply system impedance and inhibit power wiring system resonance, thereby reducing supply voltage fluctuation caused by the power wiring system resonance and noise caused by the supply voltage fluctuation.

Electronic circuit device having a function of inhibiting resonance in

An electronic device having high density wiring formed in a multi-level layer structure which has a plurality of conductors distributed with high density. Each conductor is formed to have a sectional area which is determined on the basis of length thereof such that ones of the plurality of conductors having relatively longer lengths have sectional areas larger than those ones of relatively shorter lengths. Wirings in the electronic device are formed through effecting electrical connections of conductors having step-wise increasing sectional areas to thereby control the wiring resistance and signal propagation delay thereof and also preclude a malfunction or reduction in operation performance of the device.

Electronic device having high-density wiring

A semiconductor chip carrier, an electronic module having the semiconductor chip carrier mounted therein, and an electronic device incorporating the electronic module. A semiconductor chip carrier comprises a multi-layer wiring substrate including a multi-layer ceramic board, and a thin film circuit mounted on said multi-layer ceramic board, and a semiconductor chip mounted and connected to the thin film circuit, wherein a low-resistance conductor path is provided on the surface of or in the multi-layer wiring substrate to connect between signal terminals which need to be connected with a low-resistance wire in the semiconductor chip, thereby realizing signal transmission at low resistance between the signal terminals of the semiconductor chip by this conductor path. This arrangement makes it possible to shorten the signal delay time of a semiconductor chip, and achieve higher speed signal processing in modules and electronic equipment in which a thus-improved semiconductor chip is used.

Semiconductor chip carrier, module having same chip carrier mounted

The delay circuit of the present invention has a CR integrator including a variable capacitance diode. This CR integrator is arranged between the first and second comparators. By applying a constant DC comparison voltage to the other input terminal of the second comparator, delay amounts can be selectively changed for the leading and trailing edges of the pulse waveform.

Growing community of inventors

Oiso, Japan

Hideho Yamamura