Title:
MAGNETIC AMPLIFIER
Document Type and Number:
Japanese Patent JPH08266040
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To downsize and improve spatial efficiency and reduce the manufacturing cost by constituting an overcurrent control loop, for limiting the overload control current applied to the inside primary coil of a magnetic amplifier out of a simple circuit without using a coil. SOLUTION: In the circuit constitution of a magnetic amplifier, consisting of a power amplifier 100, an output voltage adjuster 110, an overvoltage detector 120, and an overcurrent attenuator 130, a reverse current flows to a diode D1 when an overvoltage control current is large, and an overcurrent is generated in the primary coil L4 of a magnetic amplifier. An overcurrent attenuator 130 has a function of attenuating this overcurrent, and when negative voltage appears in the secondary winding L2 of a transformer T1, it turns off a field effect transistor FET so as to form an overcurrent control loop, consisting of an FET→ the primary coil L4→ a resistor R8→ a capacitor C3→ and an FET. Hereby, the overload control current flowing to the primary coil L4 is limited.
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Inventors:
SOU GIKOU
Application Number:
JP34144795A
Publication Date:
October 11, 1996
Filing Date:
December 27, 1995
Export Citation:
Assignee:
SANSEI ELECTRIC CORP
International Classes:
G05F1/32; H02M3/28; H03F9/02; (IPC1-7): H02M3/28; G05F1/32; H03F9/02
Attorney, Agent or Firm:
Hidekazu Miyoshi (1 outside)