JPH04366772A - Overcurrent detection circuit of dc power supply - Google Patents

Overcurrent detection circuit of dc power supply

Info

Publication number
JPH04366772A
JPH04366772A JP16746191A JP16746191A JPH04366772A JP H04366772 A JPH04366772 A JP H04366772A JP 16746191 A JP16746191 A JP 16746191A JP 16746191 A JP16746191 A JP 16746191A JP H04366772 A JPH04366772 A JP H04366772A
Authority
JP
Japan
Prior art keywords
output
voltage
circuit
resistance
current
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
JP16746191A
Other languages
Japanese (ja)
Inventor
Kazuo Fukunaga
Original Assignee
Tdk Corp
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 Tdk Corp filed Critical Tdk Corp
Priority to JP16746191A priority Critical patent/JPH04366772A/en
Publication of JPH04366772A publication Critical patent/JPH04366772A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable detection of high sensitivity through simple circuit constitution and to set a detecting resistance at low resistance values so as to reduce current losses by connecting between the pair of emitters of a transistor the detecting resistance for detecting output direct current.
CONSTITUTION: An input DC voltage Vin supplied between a positive input terminal 1 and a negative input terminal 2 is turned on and off by a switching transistor Q3 and is smoothed by a diode D1 and a chock coil CH and output as DC output voltages Vout of different voltage values between a positive output terminal 3 and a negative output terminal 4. In a current area wherein direct output current I0 is normal, output voltage Vs generated at the output resistance R2 of a detection circuit is set in such a way as not exceeding the threshold voltage of a control circuit 5. When the current I0 exceeds a specified value the voltage Vs of the resistance R2 exceeds the threshold voltage of the circuit 5 but even when the variation of the voltage drop of a detecting resistance R3 is several mV the voltage Vs is greatly changed. As a result, the circuit 5 recognizes overcurrent and performs control in such a way as to shorten the ON period of the transistor Q3, thereby protecting the circuit elements.
COPYRIGHT: (C)1992,JPO&Japio
JP16746191A 1991-06-13 1991-06-13 Overcurrent detection circuit of dc power supply Pending JPH04366772A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16746191A JPH04366772A (en) 1991-06-13 1991-06-13 Overcurrent detection circuit of dc power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16746191A JPH04366772A (en) 1991-06-13 1991-06-13 Overcurrent detection circuit of dc power supply

Publications (1)

Publication Number Publication Date
JPH04366772A true JPH04366772A (en) 1992-12-18

Family

ID=15850111

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16746191A Pending JPH04366772A (en) 1991-06-13 1991-06-13 Overcurrent detection circuit of dc power supply

Country Status (1)

Country Link
JP (1) JPH04366772A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009011112A (en) * 2007-06-29 2009-01-15 Rohm Co Ltd Overcurrent protection circuit and electronic equipment using the same
JP2009522989A (en) * 2005-12-29 2009-06-11 エービービー・エス.ピー.エー. Protection device for AC / DC low voltage power supply line

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6467613A (en) * 1987-09-09 1989-03-14 Mitsubishi Electric Corp Protecting circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6467613A (en) * 1987-09-09 1989-03-14 Mitsubishi Electric Corp Protecting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009522989A (en) * 2005-12-29 2009-06-11 エービービー・エス.ピー.エー. Protection device for AC / DC low voltage power supply line
JP2009011112A (en) * 2007-06-29 2009-01-15 Rohm Co Ltd Overcurrent protection circuit and electronic equipment using the same

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Legal Events

Date Code Title Description
A02 Decision of refusal

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Effective date: 19960123