This paper introduces the semiconductor devices for power supply, sensor, and process control from among Fuji Electric's semiconductor products. Particularly described are the MOSFET, IGBT, fast recovery diode, surge absorber, control IC, and hybrid IC suitable for high-speed switching out of the devices for power supply, and the IC for autofocus cameras with a built-in photosensor, one-chip pressure sensor, and control IC for field bus communication in process control out of the devices for sensor and process control.

Legal regulations against the harmonics interference of equipment connected to power systems will be issued in the near future. As a countermeasure against the harmonics interference, power factor control circuits utilizing switching power supply technology have rapidly come into wide use. To meet the market trend, Fuji Electric specially designed a power MOSFET most suitable for the power factor control circuits. This paper introduces an outline of this MOSFET.

With the progress of computer system downsizing, there has been a growing demand for UPS (Uninterruptible Power Supply) of small size, light weight, and high performance. To meet these requirements, it is indispensable to improve the performance of power semiconductor devices, the main components of power supply circuits. Recently, IGBTs (Insulated Gate Bipolar Transistors) have been used because of high-speed switching performance. This paper describes technical trends of UPS and semiconductor devices, Fuji Electric's semiconductor device lineup for UPS, and an outline of the newly developed third generation IGBT.

The switching power supply used in all electronic equipment is desired to provide with advanced functions important for power supply design, such as saving energy and protection against harmonic noise, in addition to reducing size and costs and improving efficiency. Then the diodes thereof are desired to further improve their characteristics. To meet these market needs, Fuji Electric has developed the series of products, including Schottky barrier diodes, ultrafast recovery diodes of low power dissipation, and surface mount packages with these diodes. This paper gives an outline of these diodes.

When the solid state was applied to electron devices, there was more fear of a malfunction or damage due to transient phenomena, including surge voltage and noise, resulting in demands for surge absorbers to protect the devices. To meet the market needs, Fuji Electric developed and put on the market the ceramic surge absorber "Z-TRAP" with the principal ingredient of zinc oxide utilizing its original technology. This paper describes an outline of the Z-TRAP and its applications.

The switching power supply, used for various purposes, has been technically in steady progress in size, efficiency, and safety. In line with the trends, Fuji Electric added characteristics and functions required by controllers and has promoted production of IC series for switching power supply controllers. This paper introduces the added functions of a new IC series FA5321P for current mode controllers and also a switching power supply controller circuit using this IC to improve the power factor.

As portable equipment came into wide use, the requirement of electronic systems for reduction in size, weight, and power consumption has rapidly intensified. Particularly from a viewpoint of power consumption, this paper describes Fuji Electric's control ICs for DC-DC converters, focusing on the driver MOSFET and on-off function.

There have been earnest demands that book type personal computers, portable telephones, and other portable apparatus that use batteries should be smaller, lighter, and achieve more operation hours. DC-DC converters used in these apparatus are required to be small, efficient, and general-purpose. This paper outlines a newly developed DC-DC converter. The converter incorporates power MOSFETs and a control circuit in the quad flat package. The number of external parts is reduced and easy handling and simple installation are realized. The size is small and the efficiency is high.

Devices using commercial power supply have a problem due to harmonic current generated in the supply system. Actually in the EU, regulations governing the harmonic current will be put into force from January 1, 1996, urging the need for taking measures. The active filter system and others are proposed for the harmonic current regulations. Fuji Electric has developed a quick battery charger that copes with the regulations using a choke input system. This paper introduces an outline of the aystem.

This paper describes the lineup of types, principle, and structure of Fuji Electric's autofocus (AF) module used for autofocus system of the camera. The AF module consists of an AFIC with two photosensor arrays, quantizing units and a processing unit integrated on a chip, and a straight type optical system. Distance to the object is detected by projecting an object image on the IC. Its superior points are: (1)detectable distance limitless because of passive type AF (2)small size (3)user adjustment for the AFIC and optical system not required (4)distance detectable towards any direction within the given range (multi-spot AF).

Semiconductor pressure sensors have been applied in various fields, e.g. automobile control systems and generaluse instruments. Then sensor suppliers concentrate on development of high performance sensors. Fuji Electric developed and put on the market a pressure sensor with a pressure sensing unit and a signal processing circuit integrated on a chip. Because of the ultrasmall size, ultralight weight, high accuracy and other many advantages, the sensor is expected to be used in many fields, including automobile uses. This paper outlines its features, structure, characteristics, and applications.

This paper introduces a one-chip LSI that implements the physical layer of the Fieldbus which will be the international standard of the next generation digital communication network for field devices. This LSI, developed using high-voltage Bi-CMOS technology, consists of modem circuits for communication control and transceiver circuits for bus interface.