CN103036408A - Power supply filter circuit - Google Patents
Power supply filter circuit Download PDFInfo
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- CN103036408A CN103036408A CN 201110303086 CN201110303086A CN103036408A CN 103036408 A CN103036408 A CN 103036408A CN 201110303086 CN201110303086 CN 201110303086 CN 201110303086 A CN201110303086 A CN 201110303086A CN 103036408 A CN103036408 A CN 103036408A
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- triode
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Abstract
The invention relates to a power supply filter circuit which comprises a transistor, a resistor, a first capacitor and a second capacitor. The collector electrode of the transistor is connected with an input end, the emitter electrode of the transistor is connected with an output end, the resistor is connected with the collector electrode and the base electrode of the transistor, one end of the first capacitor is connected with the base electrode of the transistor, the other end of the first capacitor is connected with ground, one end of the second capacitor is connected with the emitter electrode of the transistor, and the other end of the second capacitor is connected with the ground. Compared with the prior art, the power supply filter circuit has the advantages of reducing power ripples, and reducing circuit noise.
Description
Technical field
The present invention relates to electronic technology field, especially relate to a kind of electric source filter circuit.
Background technology
Adopt direct current supply in the programme-controlled exchange mounted circuit board, the power pack common ground is to adopt exchange conversion to become 48V direct current mode to obtain, and passes through straight/straight conversion in circuit board again, obtains corresponding operating voltage.Because service time is longer, the whole senile cause of circuit board element, caused the original noise of partial circuit plate to increase, the minimum quiescent voltage of power supply is risen, simultaneously because power supply ripple is excessive, jointly be superimposed upon on the reference voltage, cause calculator room equipment when example is surveyed, can't pass through testing standard, cause alarm.
Summary of the invention
Purpose of the present invention is exactly to provide a kind of power supply ripple that effectively reduces for the defective that overcomes above-mentioned prior art existence, reduces the electric source filter circuit of circuit noise.
Purpose of the present invention can be achieved through the following technical solutions: a kind of electric source filter circuit, comprise triode, resistance, the first electric capacity and the second electric capacity, the collector electrode of described triode connects input, emitter connects output, described resistance is connected between the collector electrode and base stage of triode, for triode provides base bias current, the base stage of described the first electric capacity one end connecting triode, other end ground connection, the first electric capacity, resistance and triode consist of electronic filter circuit, the emitter of one end connecting triode of described the second electric capacity, other end ground connection is the filter capacitor of output voltage.
Described electric source filter circuit also comprises diode, the base stage of the negative electrode connecting triode of this diode, and plus earth, this diode is voltage stabilizing didoe.By this voltage stabilizing didoe, make the base voltage of triode stable, make like this output voltage of emitter more stable.
Compared with prior art, the present invention has the following advantages:
1, because the base bias current that flows through in the resistance is very little, make ohmically pressure drop also very little, desirable one larger resistance value reaches preferably filter effect.
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 embodiment of the invention 1;
Fig. 2 is the circuit diagram of the embodiment of the invention 2.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment 1
As shown in Figure 1, a kind of electric source filter circuit, comprise triode VT, resistance R, the first capacitor C 1 and the second capacitor C 2, the collector electrode of triode VT connects input I, and emitter connects output O, collector electrode and the base stage of resistance R connecting triode VT, the base stage of the first capacitor C 1 one end connecting triode VT, other end ground connection, the emitter of an end connecting triode VT of the second capacitor C 2, other end ground connection.
Triode VT in the circuit, resistance R and the first capacitor C 1 form electronic filter circuit, and the 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 larger, and the filter effect of resistance R and the 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.The 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, this filter circuit also comprise a voltage stabilizing didoe VD, the base stage of the negative electrode connecting triode VT of this voltage stabilizing didoe VD, and plus earth, 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. electric source filter circuit, it is characterized in that, comprise triode, resistance, the first electric capacity and the 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, the base stage of described the first electric capacity one end connecting triode, other end ground connection, the emitter of an end connecting triode of described the second electric capacity, other end ground connection.
2. a kind of electric source filter circuit according to claim 1 is characterized in that, also comprises diode, the base stage of the negative electrode connecting triode of this diode, plus earth.
3. a kind of electric source filter circuit according to claim 2 is characterized in that, described diode is voltage stabilizing didoe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110303086 CN103036408A (en) | 2011-10-09 | 2011-10-09 | Power supply filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110303086 CN103036408A (en) | 2011-10-09 | 2011-10-09 | Power supply filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103036408A true CN103036408A (en) | 2013-04-10 |
Family
ID=48022983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110303086 Pending CN103036408A (en) | 2011-10-09 | 2011-10-09 | Power supply filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103036408A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183607A (en) * | 2018-02-11 | 2018-06-19 | 浙江亿邦信息技术有限公司 | A kind of power control circuit and application |
| CN108429455A (en) * | 2018-03-28 | 2018-08-21 | 深圳还是威健康科技有限公司 | A kind of voltage conversion circuit and terminal device of power supply |
| CN109560808A (en) * | 2018-12-28 | 2019-04-02 | 南京康派电子有限公司 | A kind of novel UART interface level conversion and multiplex electronics |
| CN113194389A (en) * | 2021-04-29 | 2021-07-30 | 四川虹美智能科技有限公司 | Power supply noise reduction circuit and system |
| CN113904568A (en) * | 2021-09-23 | 2022-01-07 | 深圳承启生物科技有限公司 | Power supply circuit and electronic equipment |
-
2011
- 2011-10-09 CN CN 201110303086 patent/CN103036408A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183607A (en) * | 2018-02-11 | 2018-06-19 | 浙江亿邦信息技术有限公司 | A kind of power control circuit and application |
| CN108429455A (en) * | 2018-03-28 | 2018-08-21 | 深圳还是威健康科技有限公司 | A kind of voltage conversion circuit and terminal device of power supply |
| CN109560808A (en) * | 2018-12-28 | 2019-04-02 | 南京康派电子有限公司 | A kind of novel UART interface level conversion and multiplex electronics |
| CN113194389A (en) * | 2021-04-29 | 2021-07-30 | 四川虹美智能科技有限公司 | Power supply noise reduction circuit and system |
| CN113904568A (en) * | 2021-09-23 | 2022-01-07 | 深圳承启生物科技有限公司 | Power supply circuit and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130410 |