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Title:
PHASE CONTROLLER
Document Type and Number:
Japanese Patent JPH0452711
Kind Code:
A
Abstract:
PURPOSE:To reduce the harmonic noise by detecting the current flowing to a series circuit, energizing a 1st switching element in each half cycle of an AC power supply in response to the output of the current detection, then energizing a 2nd switching element after the current to be detected is set at a steady level. CONSTITUTION:A current transformer 20 detects the current flowing to a series circuit 6 and applies it to a current detecting circuit 21. Then the circuit 21 gives its detection output to a trigger signal generating circuit 22 when the current flowing to the circuit 6 is set at a steady level. The circuit 22 outputs a trigger signal to a line 9 in response to the detection output of the circuit 21 in order to trigger a 2nd switching element T2. Thus the harmonic noise is surely reduced despite the connection of loads each different in impedance.

Inventors:
NISHIKURA HIDEKI
Application Number:
JP15640690A
Publication Date:
February 20, 1992
Filing Date:
June 14, 1990
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC WORKS LTD
International Classes:
G05F5/02; (IPC1-7): G05F5/02



 
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