Title:
【発明の名称】デンゲンカイロ
Document Type and Number:
Japanese Patent JPS5847724
Kind Code:
B2
Abstract:
A surge current protection circuit includes an input terminal supplied with a rectified alternating voltage, an output terminal to be connected to a load, and a semiconductor controlled rectifier having its anode and cathode electrodes connected in series between the input and output terminals. The collector and emitter electrodes of a control transistor are connected between the gate and cathode electrodes of the rectifier. The base-emitter voltage is supplied with any sharp transients, and the transistor becomes conductive before the rectifier if the transients are sharp enough and of high enough amplitude. Conduction of the transistor prevents the semiconductor controlled rectifier from conducting surge currents and protects circuits connected in series with the rectifier.
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Inventors:
SUZUKI TADAO
WACHI SHIGEAKI
WACHI SHIGEAKI
Application Number:
JP12472375A
Publication Date:
October 24, 1983
Filing Date:
October 16, 1975
Export Citation:
Assignee:
SONY CORP
International Classes:
G05F1/10; G05F1/56; H02H3/08; H02H7/12; H02H9/00; H02H11/00; H02M3/00; H02M3/28; H03F1/52; (IPC1-7): G05F1/58
Attorney, Agent or Firm:
Sada Ito