Hitachi, Ltd.

Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Hitachi Engineering Co., Ltd.

Takeshi Nagano

Yasuo Matsuda

Norikazu Tokunaga

Hidefumi Shirahama

Ikuo Yamato

Mitsufumi Iwanaka

Ryuichi Takagi

Atsushi Kawakatsu

Youuji Ishida

A mathematical model for simulating a dynamic characteristic of an electric power supply apparatus, a model control function for controlling an output from the mathematical model in a closed loop fashion and an electric power supply apparatus control function for approximating a control variable for the electric power supply apparatus to a reference value are provided in a control circuit, wherein an output from the mathematical model is output as a pulse width reference signal, and the pulse width reference signal is corrected by an on-delay portion due to switching elements by means of a gain revision circuit, thereby promptly and stably controlling the electric power supply apparatus.

Circuit for controlling an electric power supply apparatus, a method

A process for improving properties of a synthetic resin powder which comprises: subjecting a latex of a graft-copolymer whose back bone is a rubber to coagulation, and adding a silicone oil to the graft-copolymer in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of said graft-copolymer. According to the present invention, the bulk specific gravity of a synthetic resin powder can be made large, the flowability and blocking resistance can be remarkably improved in comparison with known methods. Accordingly, the blocking during storage can be prevented, a line for transport is not packed with the resin powder, it is possible to automatically weigh the resin powder, and it is applicable to the tendency to grow larger in transport.

Process for improving properties of synthetic resin powder

Growing community of inventors

Yokohama, Japan

Takeshi Nagano