Title:
LEVEL SWITCH
Document Type and Number:
Japanese Patent JPH04134220
Kind Code:
A
Abstract:
PURPOSE:To obtain small sized unit by eliminating an alternating voltage converting circuit constituted out of transformer in circuit parts received in a case. CONSTITUTION:Alternating voltage of 50V - 250V is supplied from outward to a rectification circuit 11 through an input terminal C, full wave rectified with a bridge circuit, and output. A filter circuit 14 is constituted out of a T-type CR circuit having a large time constant, full wave rectification waveform output from the rectification circuit 11 is integrated, input voltage is brought down, and electric power is supplied to a constant voltage circuit 12 and a switching circuit 8. The constant voltage circuit 12 generates constant voltage with a Zener diode and outputs the constant voltage. In this way, a transformer which has a large size in circuit constituting elements can be eliminated and the whole unit can be made into small size.
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Inventors:
SHIMIZU TSUTOMU
Application Number:
JP25787690A
Publication Date:
May 08, 1992
Filing Date:
September 26, 1990
Export Citation:
Assignee:
KANSAI AUTOMATION KK
International Classes:
G01F23/00; (IPC1-7): G01F23/00