JPS57166710A - Power amplifying circuit - Google Patents
Power amplifying circuitInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5394162A (en) * | 1977-01-28 | 1978-08-17 | Hitachi Ltd | Power amplifier |
-
1981
- 1981-04-06 JP JP5050681A patent/JPS57166710A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5394162A (en) * | 1977-01-28 | 1978-08-17 | Hitachi Ltd | Power amplifier |
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