JPS5721106A - Overcurrent protection circuit - Google Patents

Overcurrent protection circuit

Info

Publication number
JPS5721106A
JPS5721106A JP9583880A JP9583880A JPS5721106A JP S5721106 A JPS5721106 A JP S5721106A JP 9583880 A JP9583880 A JP 9583880A JP 9583880 A JP9583880 A JP 9583880A JP S5721106 A JPS5721106 A JP S5721106A
Authority
JP
Japan
Prior art keywords
trq
overcurrent
increased
increase
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9583880A
Other languages
Japanese (ja)
Inventor
Shuichi Kato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP9583880A priority Critical patent/JPS5721106A/en
Publication of JPS5721106A publication Critical patent/JPS5721106A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To increase the gain of an overcurrent detection circuit and to increase the Miller effect of a high band cut-off capacitor, by the circuit constitution that the load impedance of an overcurrent detection transistor can be increased.
CONSTITUTION: A resistor R3 is inserted between an overcurrent detecting resistor R and the base of an overcurrent detecting transistor (TR)Q1, the B-C of a pnp TRQ5 is connected between the E-B of a TRQ2, a diode D is connected forward between the E-B of the TRQ5, and a constant current source 9 is connected between the E of the TRQ5 and a power supply 8. Normally, the TRQ1∼Q5 are at off state, a voltage drop of a resistor R is increased at an overcurrent and a current flows to the TRQ1. In this case, since the C-B of the TRQ5 is connected to the TRQ1 and the load impedance is high, the gain of the overcurrent detection circuit section is increased, allowing to increase the Miller effect of a capacitor C.
COPYRIGHT: (C)1982,JPO&Japio
JP9583880A 1980-07-14 1980-07-14 Overcurrent protection circuit Pending JPS5721106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9583880A JPS5721106A (en) 1980-07-14 1980-07-14 Overcurrent protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9583880A JPS5721106A (en) 1980-07-14 1980-07-14 Overcurrent protection circuit

Publications (1)

Publication Number Publication Date
JPS5721106A true JPS5721106A (en) 1982-02-03

Family

ID=14148516

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9583880A Pending JPS5721106A (en) 1980-07-14 1980-07-14 Overcurrent protection circuit

Country Status (1)

Country Link
JP (1) JPS5721106A (en)

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