JPS57166710A - Power amplifying circuit - Google Patents

Power amplifying circuit

Info

Publication number
JPS57166710A
JPS57166710A JP5050681A JP5050681A JPS57166710A JP S57166710 A JPS57166710 A JP S57166710A JP 5050681 A JP5050681 A JP 5050681A JP 5050681 A JP5050681 A JP 5050681A JP S57166710 A JPS57166710 A JP S57166710A
Authority
JP
Japan
Prior art keywords
voltage
trq1
current
load
nominal value
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
JP5050681A
Other languages
Japanese (ja)
Inventor
Tadao Totsuka
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to JP5050681A priority Critical patent/JPS57166710A/en
Publication of JPS57166710A publication Critical patent/JPS57166710A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain a circuit which does not require forcible air cooling by providing a semiconductor switching element to a load current path for a semiconductor current amplifying element which drives a load such as a step motor, and turning off it when a load current exceeds the prescribed nominal value of the amplifying element.
CONSTITUTION: The 1st and 3rd windings A and A of, for example, a step motor as a load are connected to a transistor (TR) Q1 in series, and a TRQ2 is further connected to the side of a power voltage Vce of the winding A and A in series. The load current Il of the TRQ1 is controlled by a differential amplifier U1 applied with an input signal Vin. The TRQ2 cuts off the current Il by the output of a comparing circuit U2. A reference voltage generating source RVG generates a voltage equal to the sum of the nominal value of the emitter- collector saturated voltage of the TRQ1 and the terminal voltage of a resistance R1 and when the emitter-collector voltage of the TRQ1 exceeds the nominal value of the saturated voltage, the current Il is cut off. Thus, the heat generation of the TRQ1 is reduced extremely and a focible cooling means is eliminated.
COPYRIGHT: (C)1982,JPO&Japio
JP5050681A 1981-04-06 1981-04-06 Power amplifying circuit Pending JPS57166710A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5050681A JPS57166710A (en) 1981-04-06 1981-04-06 Power amplifying circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5050681A JPS57166710A (en) 1981-04-06 1981-04-06 Power amplifying circuit

Publications (1)

Publication Number Publication Date
JPS57166710A true JPS57166710A (en) 1982-10-14

Family

ID=12860838

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5050681A Pending JPS57166710A (en) 1981-04-06 1981-04-06 Power amplifying circuit

Country Status (1)

Country Link
JP (1) JPS57166710A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5394162A (en) * 1977-01-28 1978-08-17 Hitachi Ltd Power amplifier

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5394162A (en) * 1977-01-28 1978-08-17 Hitachi Ltd Power amplifier

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