CN202276285U - Power supply filter circuit used for stored program control exchange - Google Patents
Power supply filter circuit used for stored program control exchange Download PDFInfo
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- CN202276285U CN202276285U CN 201120380814 CN201120380814U CN202276285U CN 202276285 U CN202276285 U CN 202276285U CN 201120380814 CN201120380814 CN 201120380814 CN 201120380814 U CN201120380814 U CN 201120380814U CN 202276285 U CN202276285 U CN 202276285U
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- triode
- filter circuit
- power supply
- program control
- capacitor
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Abstract
The utility model relates to a power supply filter circuit used for a stored program control exchange. The power supply filter circuit includes a triode, a resistor, a first capacitor, and a second capacitor. A collector electrode of the triode is connected with an input terminal, and an emitter electrode is connected with an output terminal. The resistor is connected with the collector electrode and a base electrode of the triode. One terminal of the first capacitor is connected with the base electrode of the triode, and the other terminal of the first capacitor is connected with the ground. One terminal of the second capacitor is connected with the emitter electrode of the triode, and the other terminal is connected with the ground. Compared with the prior art, the power supply filter circuit can effectively reduce power supply ripples and circuit noises.
Description
Technical field
The utility model relates to electronic technology field, especially relates to a kind of electric source filter circuit that is used for stored-program control exchange.
Background technology
Adopt direct current supply in the stored-program control exchange circuit board, the power pack common ground is to adopt exchange conversion to become 48V direct current mode to obtain, and in circuit board, passes through straight/straight conversion again, obtains corresponding work voltage.Because service time is longer; The whole senile cause of circuit board element has caused the original noise of partial circuit plate to increase, and the minimum quiescent voltage of power supply is risen; Simultaneously because power supply ripple is excessive; Be superimposed upon jointly on the reference voltage, cause calculator room equipment when example is surveyed, can't pass through testing standard, cause alarm.
The utility model content
The purpose of the utility model is exactly for the defective that overcomes above-mentioned prior art existence a kind of power supply ripple that effectively reduces to be provided, and reduces the electric source filter circuit of circuit noise.
The purpose of the utility model can realize through following technical scheme:
A kind of electric source filter circuit that is used for stored-program control exchange comprises triode, resistance, first electric capacity and second electric capacity, and the collector electrode of described triode connects input; Emitter connects output, and described resistance is connected between the collector electrode and base stage of triode, for triode provides base bias current; Described first electric capacity, one end connects the base stage of triode; Other end ground connection, first electric capacity, resistance and triode constitute electronic filter circuit, and an end of described second electric capacity connects the emitter of triode; Other end ground connection is the filter capacitor of output voltage.
The described electric source filter circuit that is used for stored-program control exchange also comprises diode, and the negative electrode of this diode connects the base stage of triode, plus earth, and this diode is a voltage stabilizing didoe.Through this voltage stabilizing didoe, make the base voltage of triode stable, make the output voltage of emitter more stable like this.
Compared with prior art, the utlity model has following advantage:
1, because the base bias current that flows through in the resistance is very little, make ohmically pressure drop also very little, desirable one bigger resistance value reaches filter effect preferably.
2, between the base stage of triode and earth terminal, a voltage stabilizing didoe is set, makes the base voltage of triode stable, follow the specific of base voltage because the emitter voltage of triode has, thereby make the output voltage of emitter also very stable.
Description of drawings
Fig. 1 is the circuit diagram of the utility model embodiment 1;
Fig. 2 is the circuit diagram of the utility model embodiment 2.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment 1
As shown in Figure 1, a kind of electric source filter circuit that is used for stored-program control exchange comprises triode VT, resistance R, first capacitor C 1 and second capacitor C 2; The collector electrode of triode VT connects input I, and emitter connects output O, and resistance R connects collector electrode and the base stage of triode VT; First capacitor C, 1 one ends connect the base stage of triode VT; Other end ground connection, an end of second capacitor C 2 connects the emitter of triode VT, other end ground connection.
Triode VT in the circuit, resistance R and first capacitor C 1 are formed electronic filter circuit, and first resistance R provides base bias current for triode VT on the one hand, also is filter resistance simultaneously.Because flowing through the electric current of resistance R is the base bias current of triode VT; This electric current is very little; The resistance of resistance R can obtain bigger, and the filter effect of the resistance R and first capacitor C 1 is just fine like this, makes on the triode VT base stage alternating component in the direct voltage seldom.Because emitter voltage has the characteristic of following base voltage, alternating component also seldom reaches the purpose of filtering in the emitter output voltage like this.Second capacitor C 2 is the filter capacitor of output voltage, further filters power supply ripple.
Embodiment 2
As shown in Figure 2, a kind of electric source filter circuit that is used for stored-program control exchange, this filter circuit also comprise a voltage stabilizing didoe VD, and the negative electrode of this voltage stabilizing didoe VD connects the base stage of triode VT, plus earth, and remainder is with embodiment 1.
At this moment; Input voltage makes voltage stabilizing didoe VD be in reverse-bias state through resistance R; The stabilized voltage characteristic of voltage stabilizing didoe VD makes the base voltage of triode VT stable; Follow the specific of base voltage because the emitter voltage of triode VT has, thereby make the direct voltage of triode VT emitter output also more stable.
Claims (3)
1. an electric source filter circuit that is used for stored-program control exchange is characterized in that, comprises triode, resistance, first electric capacity and second electric capacity; The collector electrode of described triode connects input, and emitter connects output, and described resistance is connected between the collector electrode and base stage of triode; Described first electric capacity, one end connects the base stage of triode; Other end ground connection, an end of described second electric capacity connects the emitter of triode, other end ground connection.
2. a kind of electric source filter circuit that is used for stored-program control exchange according to claim 1 is characterized in that, also comprises diode, and the negative electrode of this diode connects the base stage of triode, plus earth.
3. a kind of electric source filter circuit that is used for stored-program control exchange according to claim 2 is characterized in that described diode is a voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120380814 CN202276285U (en) | 2011-10-09 | 2011-10-09 | Power supply filter circuit used for stored program control exchange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120380814 CN202276285U (en) | 2011-10-09 | 2011-10-09 | Power supply filter circuit used for stored program control exchange |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202276285U true CN202276285U (en) | 2012-06-13 |
Family
ID=46196622
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120380814 Expired - Fee Related CN202276285U (en) | 2011-10-09 | 2011-10-09 | Power supply filter circuit used for stored program control exchange |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202276285U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066817A (en) * | 2012-12-24 | 2013-04-24 | 成都芯源***有限公司 | Ripple suppression circuit, power supply system thereof and ripple suppression method |
| CN109787660A (en) * | 2019-03-20 | 2019-05-21 | 上海诺潇智能科技有限公司 | A kind of base band signal producing means of RFID transmit circuit |
-
2011
- 2011-10-09 CN CN 201120380814 patent/CN202276285U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103066817A (en) * | 2012-12-24 | 2013-04-24 | 成都芯源***有限公司 | Ripple suppression circuit, power supply system thereof and ripple suppression method |
| CN109787660A (en) * | 2019-03-20 | 2019-05-21 | 上海诺潇智能科技有限公司 | A kind of base band signal producing means of RFID transmit circuit |
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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: 20120613 Termination date: 20151009 |
|
| EXPY | Termination of patent right or utility model |