CN204244199U - A kind of startup buffer circuit - Google Patents
A kind of startup buffer circuit Download PDFInfo
- Publication number
- CN204244199U CN204244199U CN201420662991.5U CN201420662991U CN204244199U CN 204244199 U CN204244199 U CN 204244199U CN 201420662991 U CN201420662991 U CN 201420662991U CN 204244199 U CN204244199 U CN 204244199U
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- China
- Prior art keywords
- triode
- resistance
- electric capacity
- buffer circuit
- connects
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- Expired - Fee Related
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Abstract
The utility model discloses a kind of startup buffer circuit, comprise the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the first triode, the second triode, the 3rd triode, the first electric capacity, the second electric capacity and voltage stabilizing didoe, second resistance and the second electric capacity form RC integrating circuit, and the first resistance, the first triode, the second triode and the 3rd triode form current-limiting circuit.One described in the utility model starts buffer circuit, and the impulse current of effective restriction powered on moment, plays cushioning effect, be beneficial to the startup of equipment, reduce or remit the noise of impulse current simultaneously.
Description
Technical field
The utility model relates to a kind of electronic equipment auxiliary circuit, particularly relates to a kind of startup buffer circuit.
Background technology
The immediate current (impulse current) that the capacitive device of some electronic equipment internal makes it power in plug is very large, and the immediate current that power supply is exported is very large.At present; general electronic equipment internal is not activated buffer circuit; if impulse current exceedes the overcurrent protection value of power circuit; power protecting circuit misoperation will be caused; cause appliance boot failure; affect the normal work of equipment, simultaneously impulse current also can produce noise and causes the noise of system to increase.
Utility model content
The purpose of this utility model is just that providing a kind of to solve the problem starts buffer circuit.
The utility model is achieved through the following technical solutions above-mentioned purpose:
One described in the utility model starts buffer circuit, comprises the first resistance, second resistance, 3rd resistance, 4th resistance, first triode, second triode, 3rd triode, first electric capacity, second electric capacity and voltage stabilizing didoe, the first end of described first resistance simultaneously with the first end of described second resistance, the emitter of described first triode connects and as the voltage input end of described startup buffer circuit, the collector electrode of described first triode simultaneously with the first end of described first electric capacity, the collector electrode of described second triode, the base stage of described 3rd triode connects, the second end of described first resistance simultaneously with the base stage of described first triode, second end of described first electric capacity, the emitter of described 3rd triode connects, the second end of described second resistance simultaneously with the first end of described second electric capacity, the first end of described 3rd resistance, the negative pole of described voltage stabilizing didoe connects, second end of described 3rd resistance is connected with the base stage of described second triode, the emitter of described second triode is connected with the first end of described 4th resistance, the second end of described 4th resistance simultaneously with the positive pole of described voltage stabilizing didoe, ground connection after second end of described second electric capacity connects, the collector electrode of described 3rd triode is as the voltage output end of described startup buffer circuit.
The beneficial effects of the utility model are:
One described in the utility model starts buffer circuit, and the impulse current of effective restriction powered on moment, plays cushioning effect, be beneficial to the startup of equipment, reduce or remit the noise of impulse current simultaneously.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram starting buffer circuit described in the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, one described in the utility model starts buffer circuit, comprises the first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, first triode Q1, second triode Q2, 3rd triode Q3, first electric capacity C1, the first end of the second electric capacity C2 and voltage stabilizing didoe DZ, the first resistance R1 simultaneously with the first end of the second resistance R2, the emitter of the first triode Q1 connect and collector electrode as the voltage input end Ui starting buffer circuit, the first triode Q1 while with the first end of the first electric capacity C1, the collector electrode of the second triode Q2, the base stage of the 3rd triode Q3 connects, second end of the first resistance R1 simultaneously with the base stage of the first triode Q1, second end of the first electric capacity C1, the emitter of the 3rd triode Q3 connects, second end of the second resistance R2 simultaneously with the first end of the second electric capacity C2, the first end of the 3rd resistance R3, the negative pole of voltage stabilizing didoe DZ connects, and second end of the 3rd resistance R3 is connected with the base stage of the second triode Q2, and the emitter of the second triode Q2 is connected with the first end of the 4th resistance R4, with the positive pole of voltage stabilizing didoe DZ while of second end of the 4th resistance R4, second end of the second electric capacity C2 connects rear ground connection, and the collector electrode of the 3rd triode Q3 is as the voltage output end Uo starting buffer circuit.
One described in the utility model starts buffer circuit, and the second resistance R2 and the second electric capacity C2 forms RC integrating circuit, and the first resistance R1, the first triode Q1, the second triode Q2 and the 3rd triode Q3 form current-limiting circuit.Powered on moment, input voltage charges to the second electric capacity C2 by the second resistance R2, and the base voltage of the second triode Q2 increases gradually, and the collector electrode output current of the 3rd triode Q3 increases gradually; And the collector electrode output current of the 3rd triode Q3 increases, the electric current flowing through the first resistance R1 increases, the voltage at the first resistance R1 two ends becomes large, the emitter of the first triode Q1 and base voltage become large, emitter and the collector voltage of the first triode Q1 decline, emitter and the base voltage of the 3rd triode Q3 decline, and the collector electrode output current of the 3rd triode Q3 declines, and finally reaches the object of buffering immediate current.
Claims (1)
1. a startup buffer circuit, is characterized in that: comprise the first resistance, second resistance, 3rd resistance, 4th resistance, first triode, second triode, 3rd triode, first electric capacity, second electric capacity and voltage stabilizing didoe, the first end of described first resistance simultaneously with the first end of described second resistance, the emitter of described first triode connects and as the voltage input end of described startup buffer circuit, the collector electrode of described first triode simultaneously with the first end of described first electric capacity, the collector electrode of described second triode, the base stage of described 3rd triode connects, the second end of described first resistance simultaneously with the base stage of described first triode, second end of described first electric capacity, the emitter of described 3rd triode connects, the second end of described second resistance simultaneously with the first end of described second electric capacity, the first end of described 3rd resistance, the negative pole of described voltage stabilizing didoe connects, second end of described 3rd resistance is connected with the base stage of described second triode, the emitter of described second triode is connected with the first end of described 4th resistance, the second end of described 4th resistance simultaneously with the positive pole of described voltage stabilizing didoe, ground connection after second end of described second electric capacity connects, the collector electrode of described 3rd triode is as the voltage output end of described startup buffer circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420662991.5U CN204244199U (en) | 2014-11-07 | 2014-11-07 | A kind of startup buffer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420662991.5U CN204244199U (en) | 2014-11-07 | 2014-11-07 | A kind of startup buffer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204244199U true CN204244199U (en) | 2015-04-01 |
Family
ID=52773637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420662991.5U Expired - Fee Related CN204244199U (en) | 2014-11-07 | 2014-11-07 | A kind of startup buffer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204244199U (en) |
-
2014
- 2014-11-07 CN CN201420662991.5U patent/CN204244199U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150401 Termination date: 20151107 |
|
| EXPY | Termination of patent right or utility model |