JPS5721106A - Overcurrent protection circuit - Google Patents
Overcurrent protection circuitInfo
- 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
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
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) |
-
1980
- 1980-07-14 JP JP9583880A patent/JPS5721106A/en active Pending
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