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Title:
PHASE CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JPS5829368
Kind Code:
A
Abstract:
PURPOSE:To control conductivity to load by setting the conductivity of a power control element by external DC control voltage and mounting a gate trigger circuit synchronizing by zero-cross pulses. CONSTITUTION:When phase control voltage EP is inputted, anode terminal voltage VC increases with the rise of the charging voltage of a capacitor 12. When VC reaches gate terminal voltage VG at time t1, a PUT 9 is conducted, and the power control element 3 is triggered. The PUT 9 maintains an ON state up to time t2 from t1, a comparator 19 is at ON during a period up to time t3 from t2, the terminal voltage VC is short-circuited through a resistor 26, and the anode terminal voltage of the PUT 9 reaches zero volt, and is at OFF. However, when VP voltage functioning as the zero-cross pulses reaches ''H'' at the time t3 when the comparator 19 is at OFF, the terminal voltage VC starts its rise at charging time corresponding to phase control voltage EP1. The same operation is repeated successively.

Inventors:
MURAKAMI HIROKUNI
TSUBOI MAKOTO
FUJIEDA HIROSHI
Application Number:
JP12564481A
Publication Date:
February 21, 1983
Filing Date:
August 11, 1981
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G05F1/10; H02M1/16; H02M5/257; (IPC1-7): G05F1/455; H02M1/08



 
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