JPS5494857A - Load protection circuit - Google Patents

Load protection circuit

Info

Publication number
JPS5494857A
JPS5494857A JP118478A JP118478A JPS5494857A JP S5494857 A JPS5494857 A JP S5494857A JP 118478 A JP118478 A JP 118478A JP 118478 A JP118478 A JP 118478A JP S5494857 A JPS5494857 A JP S5494857A
Authority
JP
Japan
Prior art keywords
circuit
shift
load
collector
middle point
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.)
Granted
Application number
JP118478A
Other languages
Japanese (ja)
Other versions
JPS6046848B2 (en
Inventor
Kazuo Watanabe
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP53001184A priority Critical patent/JPS6046848B2/en
Publication of JPS5494857A publication Critical patent/JPS5494857A/en
Publication of JPS6046848B2 publication Critical patent/JPS6046848B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE: To avoid the damage of load (speakers etc.) due to the middle point DC voltage shift, by enabling to set freely the shift in the push pull output circuit.
CONSTITUTION: The collector of transistor Q1 taking the base and collector common, is connected to the output point of the push pull output circuit 4 via the Zener diode D and resistor Ro constituting the level shift circuit 3. Further, Q2 taking common the base of Q1 is provided, forming the current Miller circuit. The resistor R3 placed on the collector of Q2 adjusts the threshold voltage of the amplifying circuit 1, that is, matches the input signal of the amplifying circuit 1 required to turn on the switching means 5 such as relays with the detected middle point. Thus, the switching means 5 placed to load protection can be set depending on the shift of arbitrary middle point potential and the protection according to the permissible value of load can be made.
COPYRIGHT: (C)1979,JPO&Japio
JP53001184A 1978-01-11 1978-01-11 load protection circuit Expired JPS6046848B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP53001184A JPS6046848B2 (en) 1978-01-11 1978-01-11 load protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP53001184A JPS6046848B2 (en) 1978-01-11 1978-01-11 load protection circuit

Publications (2)

Publication Number Publication Date
JPS5494857A true JPS5494857A (en) 1979-07-26
JPS6046848B2 JPS6046848B2 (en) 1985-10-18

Family

ID=11494356

Family Applications (1)

Application Number Title Priority Date Filing Date
JP53001184A Expired JPS6046848B2 (en) 1978-01-11 1978-01-11 load protection circuit

Country Status (1)

Country Link
JP (1) JPS6046848B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007088921A (en) * 2005-09-22 2007-04-05 Matsushita Electric Ind Co Ltd Speaker protecting circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007088921A (en) * 2005-09-22 2007-04-05 Matsushita Electric Ind Co Ltd Speaker protecting circuit

Also Published As

Publication number Publication date
JPS6046848B2 (en) 1985-10-18

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