Matsushita Electric Works, Ltd.

Yoshinori Akinari

Yukihiro Murata

Nobuhiro Kitamura

Yoshihisa Ishigami

A solar battery SB for detecting the surrounding brightness is provided and a switching element SW is controlled based on output voltage of the solar battery SB. The switching element SW is made up of MOSFETs Q and Q . To form an electronic automatic on/off switch, a triac Q is controlled by turning on/off the switching element SW.

Illumination sensor with spectral sensitivity corresponding to human luminosity characteristic

An electromagnet drive apparatus being characterized by a switching element 1 connected in series with a coil 3 of an electromagnet; a pulse signal generation circuit 16 which generates, on predetermined cycles, a pulse signal used for turning on the switching element; a regenerative circuit 4 which permits flow of a regenerated electrical current when the switch section is turned on and the switching element is turned off from a state in which the switch section and the switching element are in an on state and a source voltage is applied to the coil of the electromagnet, and which causes the power absorbing element to immediately reduce the regenerated electrical current flowing through the coil of the electromagnet when the switch section and the switching element are turned off; and a delay circuit 11 which turns on the switch section by application of the supply voltage and maintains the switch section in an on state until a predetermined period of time elapses after the application of the supply voltage has been stopped.

Growing community of inventors

Kadoma, Japan

Yoshinori Akinari