Panasonic Intellectual Property Management Co., Ltd.

Sanyo Electric Co., Ltd.

Nitta Gelatin Inc.

Hiroshi Saeki

Takeshi Nakashima

Tomomichi Nakai

Kazuo Ishimoto

Hisayuki Kobayashi

Masahiro Koezuka

Naohito Kondo

Sachiko Oda

Keizo Tanisaka

In the present invention, a main switch circuit () is provided between an electric power line (PL), to which voltage outputted from a solar cell () is applied, and a battery module (). A protection circuit () turns OFF the main switch circuit () to protect the battery module () from overcharging when the voltage (VBAT) of the battery module () is equal to or greater than an upper limit voltage. The voltage outputted from the solar cell () is set so as to be greater than the upper limit voltage to allow the battery module () to be charged to the upper limit voltage. When a charge ON command signal has been received, a control unit () turns ON only a sub-switch circuit () to introduce current from the solar cell () into a parallel circuit () and to suppress the voltage (VPL) of the power line (PL) to less than the upper limit voltage before turning ON the main switch circuit ().

Switching device

There is provided a prioritization circuit which selects one of a system power supply and a secondary battery unit as a selected supply source and the other as a non-selected supply source and which causes supply of electric power with a higher priority from the selected supply source to a power supply unit, wherein the non-selected supply source is connected to the power supply unit through a diode element which generates a voltage drop and the selected supply source supplies electric power to the power supply unit without passing through a diode element.

Prioritization circuit and electric power supply system

Method for culturing animal cells in collagen drops on a support

Growing community of inventors

Osaka, Japan

Hiroshi Saeki