CN103715876B - Low-voltage drop active power filter - Google Patents
Low-voltage drop active power filter Download PDFInfo
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- CN103715876B CN103715876B CN201310714789.2A CN201310714789A CN103715876B CN 103715876 B CN103715876 B CN 103715876B CN 201310714789 A CN201310714789 A CN 201310714789A CN 103715876 B CN103715876 B CN 103715876B
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- triode
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Abstract
A kind of low-voltage drop active power filter, including a constant-current source circuit, a low-pass filter network circuit, a negative-feedback circuit and a subsystem negative-feedback circuit, reference voltage is provided using clean power supply.Constant-current source circuit, low-pass filter network circuit, negative-feedback circuit and subsystem negative-feedback circuit are made up of general triode, capacitor and resistor.Negative-feedback circuit is made up of a PNP type triode to pipe and two same models, ensures that pipe the base voltage of the PNP type triode of two same models is consistent.Circuit cost is low, pressure drop in passband is fairly small, and the decay in stopband is bigger, and the suppression for interference noise is more preferable, the noise signal being mixed in power input noise after low-pass filter network circuit can obtain great suppression, while useful signal is effectively maintained.In addition, for different decay and the demand of bandwidth, circuit of the invention has more adjustable parameters, and adjustable surplus is bigger.
Description
Technical field:
The present invention relates to electricity field, more particularly to vehicle power active filter circuit, particularly a kind of low-voltage drop active
Power-supply filter.
Background technology:
The integrated level more and more higher of the automobile chip of vehicle electronics product, chip are required also increasingly the ripple of power supply
Height, and the input voltage range of chip itself is more and more narrow.Traditional power filter network, its pressure difference is larger, in some voltages
The very low occasion of drop requirements is difficult to meet the input voltage requirement of chip, system problem easily occurs.In the prior art, power supply
Filter circuit has following technical scheme：
(1) LC filter circuits.The inductance value for the inductance that the circuit of this kind of topological structure needs is larger, relatively
Price height cause cost also high.Accomplish the LC exponent numbers that decay big in stopband needs
It can accordingly increase, considerably increase the BOM costs of project.
(2) RC filter circuits.The pressure drop when electric current is big of the circuit of this kind of topological structure can greatly increase,
It is difficult the requirement for meeting chip to cause input voltage, while resistive dissipation is also big problem.And
And the circuit of the topological structure is when also having decay big in stopband the problem of RC exponent number increases.
(3) triode active filter circuit.The topological structure uses a resistance, an electric capacity and one
Individual NPN triode, output end and input pressure drop are bigger, using being restricted.
The content of the invention：
It is an object of the invention to provide a kind of low-voltage drop active power filter, described this low-voltage drop active power supply
Wave filter will solve that electric source filter circuit passband internal drop in the prior art is big, the resistance technical problem that band attenuation is small, cost is high.
This low-voltage drop active power filter of the present invention, including a constant-current source circuit, a low-pass filter network
Circuit, a negative-feedback circuit and a subsystem negative-feedback circuit, wherein, described constant-current source circuit is by the six or three pole
Pipe, the 7th triode, the 8th triode, a reference voltage input terminal and a 3rd resistor device are formed, described
Reference voltage input terminal be connected with the emitter stage of the 6th described triode, the colelctor electrode of the 6th triode passes through described the
It is grounded after three resistors, the colelctor electrode of the 6th triode is connected with base stage, the emitter stage of the 6th triode and the described the 7th 3
The emitter stage connection of pole pipe, the base stage of the 6th triode is connected with the base stage of the 7th triode, the emitter stage of the 7th triode and
The emitter stage connection of the 8th described triode, the base stage of the 7th triode are connected with the base stage of the 8th triode, and described is negative
Feedback circuit is made up of first triode, second triode, the 3rd triode and the 4th triode, institute
The first triode and the second triode stated are the PNP type triode with model, the 3rd described triode and the 4th triode
Composition is connected to pipe, the emitter stage of the first triode with the emitter stage of the second triode, the colelctor electrode pole of the first triode and the
The colelctor electrode of three triodes is connected with base stage, and the colelctor electrode of the second triode is connected with the colelctor electrode of the 4th triode, and the three or three
The base stage of pole pipe is connected with the base stage of the 4th triode, and the emitter stage of the 3rd triode and the emitter stage of the 4th triode connect respectively
Colelctor electrode of the emitter stage of ground, the emitter stage of the first triode and the second triode with the 7th triode is connected, described son
System negative-feedback circuit is made up of the 5th triode, the 9th triode and the 5th capacitor, the second triode
Colelctor electrode and the colelctor electrode of the 4th triode connect with the base stage of the 5th described triode
Connecing, the grounded collector of the 5th triode, the emitter stage of the 5th triode is connected with the colelctor electrode of the 8th triode,
The emitter stage of 5th triode is connected with the base stage of the 9th described triode, and the emitter stage of the 9th triode passes through one the 5th
It is grounded after resistor, the 5th described capacitor is connected between the colelctor electrode of the 9th triode and the base stage of the 5th triode,
Described low-pass filter network circuit is made up of a first resistor device, a second resistance device and the 4th capacitor, institute
State first resistor device and second resistance device series connection after be connected between supply voltage electrode input end and ground, first resistor device and
Connection conductor between second resistance device is connected with the base stage of the first triode, and the 4th described capacitor is connected to the one or three pole
Between the base stage and ground of pipe, supply voltage electrode input end is connected with the emitter stage of the tenth triode, and the described the 13rd
The base stage of pole pipe is connected with the colelctor electrode of the 9th triode, and an output voltage terminal is connected with the colelctor electrode of the tenth triode,
It is connected in series with the 6th resistor and the 7th resistor between the colelctor electrode and ground of tenth triode, the described the 6th
Connection conductor between resistor and the 7th resistor is connected with the base stage of the second triode.
Further, the 13rd electric capacity is connected between the colelctor electrode of the tenth triode and the base stage of the second triode
Device.
Further, an output capacitor and an equivalent string are connected in series between described output voltage terminal and ground
Join resistor, output capacitor and equivalent series resistor after series connection with connect after the 6th resistor and the 7th resistor simultaneously
Connection.
Further, be connected with load between described output voltage terminal and ground, described load with connect after the 6th
Resistor and the 7th capacitor in parallel.
Further, a pure power supply is provided between reference voltage input terminal and ground.
Further, described pure power supply includes a battery.
The present invention operation principle be：It is mingled with noise signal on supply voltage electrode input end.3rd triode and
Four triodes composition ensures that the base stage of the first triode is consistent with the base voltage of the second triode, forms negative-feedback to pipe.It is low
The base stage of the triode of pass filter network circuit second obtains good noise suppression ability.Pure power supply is as the reference voltage.It is whole
Individual loop forms degeneration factor.Its process is as follows：Load voltage due to interference uprise when → second transistor base voltage become
High → electric current for flowing through the second triode diminishes → because the 7th triode constant current acts on, flow through the first triode electric current uprise →
Flow through the 3rd triode electric current uprise the → the three triode BE both ends pressure difference uprise the → the four triode BE both ends pressure difference uprise →
4th triode B electrode currents become big, and → the 4th triode C electrode currents become big → diminishes due to flowing through the second triode electric current, so
Flowing through the 5th triode B electrode currents increases the → the eight triode constant current effect, flows through the 9th triode electric current and reduces → flow through the
Ten triode electric currents reduce the → the ten triode VCE and become big → output voltage reduction, so as to complete negative-feedback.
The present invention compares with prior art, and its effect is positive and obvious.The present invention is using general triode, electricity
Container and resistor respectively constitute constant-current source circuit, low-pass filter network circuit, negative-feedback circuit and subsystem negative-feedback circuit,
Circuit cost is low, and the pressure drop in passband is fairly small, and the decay in stopband is bigger, and the suppression for interference noise is more preferable, folder
The miscellaneous noise signal in power input noise after low-pass filter network circuit can obtain great suppression, while useful
Signal is effectively maintained.In addition, for different decay and the demand of bandwidth, circuit of the invention has more adjustable
The parameter of section, adjustable surplus are bigger.
Brief description of the drawings：
Fig. 1 is the principle schematic of the low-voltage drop active power filter of the present invention.
Embodiment：
Embodiment 1:
As shown in figure 1, the low-voltage drop active power filter of the present invention, including a constant-current source circuit, a low pass filtered
Wave network circuit, a negative-feedback circuit and a subsystem negative-feedback circuit, wherein, constant-current source circuit is by the six or three pole
Pipe Q6, a 7th triode Q7, the 8th triode Q8, a reference voltage input terminal Vref and a 3rd resistor device
R3 is formed, and reference voltage input terminal Vref is connected with the 6th triode Q6 emitter stage, and the 6th triode Q6 colelctor electrode passes through
It is grounded after 3rd resistor device R3, the 6th triode Q6 colelctor electrode is connected with base stage, the 6th triode Q6 emitter stage and the 7th
Triode Q7 emitter stage connection, the 6th triode Q6 base stage are connected with the 7th triode Q7 base stage, the 7th triode Q7
Emitter stage be connected with the 8th triode Q8 emitter stage, the 7th triode Q7 base stage and the 8th triode Q8 base stage connect
Connect, negative-feedback circuit is by a first triode Q1, a second triode Q2, a 3rd triode Q3 and one the four or three
Pole pipe Q4 is formed, and the first triode Q1 and the second triode Q2 are the PNP type triode with model, the 3rd triode Q3 and the 4th
Triode Q4 compositions are connected to pipe, the first triode Q1 emitter stage with the second triode Q2 emitter stage, the first triode Q1
Colelctor electrode pole be connected with the 3rd triode Q3 colelctor electrode and base stage, the second triode Q2 colelctor electrode and the 4th triode Q4
Colelctor electrode connection, the 3rd triode Q3 base stage is connected with the 4th triode Q4 base stage, the 3rd triode Q3 emitter stage
Be grounded respectively with the 4th triode Q4 emitter stage, the first triode Q1 emitter stage and the second triode Q2 emitter stage with
7th triode Q7 colelctor electrode connection, subsystem negative-feedback circuit is by a 5th triode Q5, a 9th triode Q9
Formed with the 5th capacitor C5, the second triode Q2 colelctor electrode and the 4th triode Q4 colelctor electrode with the five or three pole
Pipe Q5 base stage connection, the 5th triode Q5 grounded collector, the 5th triode Q5 emitter stage and the 8th triode Q8's
Colelctor electrode is connected, and the 5th triode Q5 emitter stage is connected with the 9th triode Q9 base stage, the 9th triode Q9 emitter stage
It is grounded after a 5th resistor R5, the 5th capacitor C5 is connected to the 9th triode Q9 colelctor electrode and the 5th triode
Between Q5 base stage, low-pass filter network circuit is by a first resistor device R1, a second resistance device R2 and one the 4th electricity
Container C4 is formed, and supply voltage electrode input end Vin and ground are connected to after first resistor device R1 and second resistance device R2 series connection
Between, the connection conductor between first resistor device R1 and second resistance device R2 is connected with the first triode Q1 base stage, the 4th electric capacity
Device C4 is connected between the first triode Q1 base stage and ground, supply voltage electrode input end Vin and a tenth triode Q10
Emitter stage connection, the tenth triode Q10 base stage is connected with the 9th triode Q9 colelctor electrode, the tenth triode Q10 collection
An output voltage terminal Vout is connected with electrode, one is connected in series between the tenth triode Q10 colelctor electrode and ground
Six resistor R6 and a 7th resistor R7, the connection conductor and the two or three between the 6th resistor R6 and the 7th resistor R7
Pole pipe Q2 base stage connection.
Further, it is connected with one the tenth between the tenth triode Q10 colelctor electrode and the second triode Q2 base stage
Three capacitor C13.
Further, an output capacitor Cout is connected in series between output voltage terminal Vout and ground and one equivalent
Resistors in series ESR, output capacitor Cout and equivalent series resistor ESR after series connection with connect after the 6th resistor R6
It is in parallel with the 7th resistor R7.
Further, load Rload is connected between output voltage terminal Vout and ground, load Rload and after connecting the
Six resistor R6 and the 7th resistor R7 are in parallel.
Further, a pure power supply is provided between reference voltage input terminal Vref and ground.
Further, pure power supply includes a battery.
The operation principle of the present embodiment is：It is mingled with noise signal V_noise on supply voltage electrode input end Vin.The
Three triode Q3 and the 4th triode Q4 compositions ensure the first triode Q1 base stage and the second triode Q2 base stage electricity to pipe
Pressure is consistent, forms negative-feedback.The second triode of low-pass filter network circuit Q2 base stage obtains good noise suppression ability.It is pure
Net power supply is as the reference voltage.Whole loop forms degeneration factor.Its process is as follows：When load voltage uprises due to disturbing →
Second triode Q2 base voltages uprise → flow through the second triode Q2 electric current diminish → due to the 7th triode Q7 constant currents make
With flowing through the first triode Q1 electric currents and uprise → flow through the 3rd triode Q3 electric currents and uprise the → the three triode Q3BE both ends pressure difference
The → the four triode Q4BE both ends pressure difference is uprised to uprise the → the four triode Q4B electrode currents to become big → the 4th triode Q4C extremely electric
Rheology is big → diminishes due to flowing through the second triode Q2 electric currents, so flowing through the 5th triode Q5B electrode currents increase → the eight or three
Pole pipe Q8 constant currents act on, and flow through the 9th triode Q9 electric currents and reduce → flow through the pole of the tenth triode Q10 electric currents reduction → the 13
Pipe Q10VCE, which becomes big → output voltage, to be reduced, so as to complete negative-feedback.
Claims (5)
1. a kind of low-voltage drop active power filter, including a constant-current source circuit, a low-pass filter network circuit, one it is negative
Feedback circuit and a subsystem negative-feedback circuit, it is characterised in that：Described constant-current source circuit is by the 6th triode, one
Individual 7th triode, the 8th triode, a reference voltage input terminal and a 3rd resistor device are formed, described reference
Voltage input end is connected with the emitter stage of the 6th described triode, and the colelctor electrode of the 6th triode passes through described 3rd resistor
It is grounded after device, the colelctor electrode of the 6th triode is connected with base stage, the emitter stage of the 6th triode and the 7th described triode
Emitter stage connects, and the base stage of the 6th triode is connected with the base stage of the 7th triode, the emitter stage of the 7th triode and described
The emitter stage connection of 8th triode, the base stage of the 7th triode are connected with the base stage of the 8th triode, described negative-feedback electricity
It route first triode, second triode, the 3rd triode and the 4th triode to form, described the
One triode and the second triode are the PNP type triode with model, the 3rd described triode and the 4th triode composition pair
Pipe, the emitter stage of the first triode are connected with the emitter stage of the second triode, the colelctor electrode of the first triode and the 3rd triode
Colelctor electrode connected with base stage, the colelctor electrode of the second triode is connected with the colelctor electrode of the 4th triode, the base of the 3rd triode
Pole is connected with the base stage of the 4th triode, and the emitter stage of the 3rd triode and the emitter stage of the 4th triode are grounded respectively, and first
Colelctor electrode of the emitter stage of the emitter stage of triode and the second triode with the 7th triode is connected, and described subsystem is negative anti-
Current feed circuit is made up of the 5th triode, the 9th triode and the 5th capacitor, the colelctor electrode of the second triode
It is connected with base stage of the colelctor electrode of the 4th triode with the 5th described triode, the grounded collector of the 5th triode, the
The emitter stage of five triodes is connected with the colelctor electrode of the 8th triode, the emitter stage of the 5th triode and the 9th described triode
Base stage connection, the emitter stage of the 9th triode is grounded after the 5th resistor, and the 5th described capacitor is connected to
Between the colelctor electrode of 9th triode and the base stage of the 5th triode, described low-pass filter network circuit is by a first resistor
Device, a second resistance device and the 4th capacitor are formed, and are connected after described first resistor device and the series connection of second resistance device
Between supply voltage electrode input end and ground, tie point and the first triode between first resistor device and second resistance device
Base stage is connected, and the 4th described capacitor is connected between base stage and the ground of the first triode, supply voltage electrode input end with
The emitter stage connection of one the tenth triode, the base stage of the tenth described triode are connected with the colelctor electrode of the 9th triode, the
An output voltage terminal is connected with the colelctor electrode of ten triodes, is connected in series between the colelctor electrode and ground of the tenth triode
One the 6th resistor and the 7th resistor, the tie point and second between the 6th described resistor and the 7th resistor
The base stage connection of triode, is connected with the 13rd electric capacity between the colelctor electrode of the tenth triode and the base stage of the second triode
Device.
2. low-voltage drop active power filter as claimed in claim 1, it is characterised in that：Described output voltage terminal and ground
Between be connected in series with an output capacitor and an equivalent series resistor, output capacitor after series connection and equivalent series electricity
The 6th resistor and the 7th capacitor in parallel after hindering device and connecting.
3. low-voltage drop active power filter as claimed in claim 1, it is characterised in that：Described output voltage terminal and ground
Between be connected with load, described load with connect after the 6th resistor and the 7th capacitor in parallel.
4. low-voltage drop active power filter as claimed in claim 1, it is characterised in that：Between reference voltage input terminal and ground
It is provided with a pure power supply.
5. low-voltage drop active power filter as claimed in claim 4, it is characterised in that：Described pure power supply includes one
Battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310714789.2A CN103715876B (en) | 2013-12-23 | 2013-12-23 | Low-voltage drop active power filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310714789.2A CN103715876B (en) | 2013-12-23 | 2013-12-23 | Low-voltage drop active power filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103715876A CN103715876A (en) | 2014-04-09 |
| CN103715876B true CN103715876B (en) | 2018-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310714789.2A Active CN103715876B (en) | 2013-12-23 | 2013-12-23 | Low-voltage drop active power filter |
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| Country | Link |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007128B (en) * | 2019-05-07 | 2023-11-21 | 延锋伟世通电子科技（上海）有限公司 | Low-voltage low-frequency small-signal current detection circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87100128A (en) * | 1986-01-10 | 1987-11-11 | 株式会社日立制作所 | Be applicable to the amplifying circuit of active filter circuit |
| CN101997514A (en) * | 2009-08-24 | 2011-03-30 | 曾立帅 | Active high-pass wave filter amplification circuit |
| CN102231623A (en) * | 2011-04-15 | 2011-11-02 | 清华大学 | Active low-pass filter based on positive feedback inductance substitution method |
| CN102638240A (en) * | 2012-04-24 | 2012-08-15 | 无锡中科微电子工业技术研究院有限责任公司 | Double-mode type active power filter circuit with adjustable bandwidth |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3556469B2 (en) * | 1998-05-27 | 2004-08-18 | アルプス電気株式会社 | Active low-pass filter |
| US7062248B2 (en) * | 2003-01-16 | 2006-06-13 | Nokia Corporation | Direct conversion receiver having a low pass pole implemented with an active low pass filter |
-
2013
- 2013-12-23 CN CN201310714789.2A patent/CN103715876B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87100128A (en) * | 1986-01-10 | 1987-11-11 | 株式会社日立制作所 | Be applicable to the amplifying circuit of active filter circuit |
| CN101997514A (en) * | 2009-08-24 | 2011-03-30 | 曾立帅 | Active high-pass wave filter amplification circuit |
| CN102231623A (en) * | 2011-04-15 | 2011-11-02 | 清华大学 | Active low-pass filter based on positive feedback inductance substitution method |
| CN102638240A (en) * | 2012-04-24 | 2012-08-15 | 无锡中科微电子工业技术研究院有限责任公司 | Double-mode type active power filter circuit with adjustable bandwidth |
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| CN103715876A (en) | 2014-04-09 |
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