LOAD DRIVE CIRCUIT

PROBLEM TO BE SOLVED: To provide a load drive circuit in which an overcurrent protective current value is designed easily and which can prevent an element breakdown due to an overcurrent. SOLUTION: A power supply 1, a load 2 and a power transistor T1 are connected in series, and a series circuit of...

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Bibliographic Details
Main Authors MIURA SHOJI, SUZUKI MIKIMASA
Format Patent
LanguageEnglish
Published 20.06.2003
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
BASIC ELECTRONIC CIRCUITRY
CONTROLLING
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
PHYSICS
PULSE TECHNIQUE
REGULATING
SEMICONDUCTOR DEVICES
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
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Summary:PROBLEM TO BE SOLVED: To provide a load drive circuit in which an overcurrent protective current value is designed easily and which can prevent an element breakdown due to an overcurrent. SOLUTION: A power supply 1, a load 2 and a power transistor T1 are connected in series, and a series circuit of a transistor T3 for current detection and a resistor 9 for current detection is connected in parallel to the power transistor T1. A control circuit 3 switching-controls both transistors T1, T3. The base terminal of a protective transistor T4 is connected across the transistor T3 and the resistor 9, when a voltage generated across both terminals of the resistor 9 exceeds a prescribed value, a voltage across control terminals of the transistors T1, T3 is adjusted forcibly, and a current flowing to the load 2 is limited. A negative characteristic as a temperature characteristic of the resistor 9 is provided with reference to the protective transistor T4 having a negative temperature characteristic. COPYRIGHT: (C)2003,JPO
Bibliography:Application Number: JP20010373132