SHORT CIRCUIT PROTECTING CIRCUIT OF TRANSISTOR

PURPOSE:To realize a short circuit preventing circuit of a transistor which prevent the transistor from the breakdown due to a short circuit, by connecting a resistor for detection of current in series to a load and turning on a protecting transistor with the voltage at the both ends of the resistor...

Full description

Saved in:
Bibliographic Details
Main Authors ICHIISHI TSUNEO, ISHIYAMA FUMIO, YODA MIKIO, SHINOHARA YASUSHI, OZAKA AKIRA
Format Patent
LanguageEnglish
Published 23.07.1982
Subjects
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
PULSE TECHNIQUE
Online AccessGet full text

Cover

More Information
Summary:PURPOSE:To realize a short circuit preventing circuit of a transistor which prevent the transistor from the breakdown due to a short circuit, by connecting a resistor for detection of current in series to a load and turning on a protecting transistor with the voltage at the both ends of the resistor. CONSTITUTION:When a short circuit occures across a load 1, the current flowing through a resistance 14 increases. When this current exceeds the Zener voltage of a Zener diode 17, the base current flows to a transistor (TR)15. As a result, a large current is poured to the base of a TR5 through a resistance 18. This increases the collector current of a TR4. At the same time, the base current increases more than the short circuit current. As a result, the TR4 keeps the saturated state even after the occurrence of a short circuit to reduce the loss caused within the TR4. Meanswhile a fuse 13 is fused to prevent the breakdown of the TR4.
Bibliography:Application Number: JP19810003187