CN103001474B - Power supply active filter and filtering method thereof - Google Patents
Power supply active filter and filtering method thereof Download PDFInfo
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- CN103001474B CN103001474B CN201210499365.4A CN201210499365A CN103001474B CN 103001474 B CN103001474 B CN 103001474B CN 201210499365 A CN201210499365 A CN 201210499365A CN 103001474 B CN103001474 B CN 103001474B
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Abstract
Disclosure one power supply active filter and filtering method, this filtering method comprises the following steps: input voltage measurement module detection power input voltage, and is filtered processing to it, it is thus achieved that reference voltage；Output voltage detection module detection electric power output voltage；The electric power output voltage detected is compared by VRM Voltage Regulator Module with reference voltage, and according to comparative result, regulates electric power output voltage, so that it follows reference voltage change.The present invention using the DC voltage of the ripple voltage signal in filter out power input voltage as reference voltage, by reverse adjustment, electric power output voltage is made to follow reference voltage change, reach the purpose of power supply active power filtering, and power supply has and significantly high filters performance, electric power output voltage is stably exported, and then makes loaded work piece reliable and stable.Power supply active filter disclosed by the invention has circuit structure advantages of simple, and the number of elements of use is few, with low cost, advantage stable and reliable in work.<!--1-->
Description
Technical field
The present invention relates to power technique fields, particularly relate to a kind of power supply active filter and filtering method thereof.
Background technology
Switching Power Supply is to utilize modern power electronics technology, controls the time ratio that switch transistors pipe turns on and off, and maintains a kind of power supply of regulated output voltage.Switching Power Supply is generally controlled IC by pulse width modulation and switch element part (MOSFET, BJT etc.) is constituted.
Switching Power Supply high frequency is the direction of its development, and high frequency makes Switching Power Supply miniaturization, and makes Switching Power Supply enter wider application field, particularly in the application of high-technology field, has promoted the miniaturization of new high-tech product, lighting.Additionally the development of Switching Power Supply be applied in saving the energy, economize on resources and protect environment aspect all to have great importance.
But, Switching Power Supply also has shortcoming, for instance electromagnetic interference is very big, and electromagnetic compatibility was not easy, it is necessary to increasing extra cost and solve the problem of electromagnetic compatibility, response speed is slow.This is determined by its principle, therefore the output ripple voltage of Switching Power Supply is big, its ripple voltage includes high frequency ripple and low-frequency ripple, wherein high frequency ripple can be filtered by LC filter circuit, but tens it is difficult to filter to the low-frequency ripple of hundreds of hertz due to what load change caused, it means that passive power filter unit to have of a sufficiently low cut-off frequency, also require there are enough ripple damping capacities, also wanting to bear big electric current, current this passive filtering unit can't realize simultaneously.The result so brought is to make loaded work piece unstable, loaded work piece even can be made abnormal or protection circuit erroneous action.
Summary of the invention
The main purpose of the present invention is to propose a kind of power supply active filter and filtering method thereof, it is intended to the ripple voltage in filter out power input voltage, stabilized power source output voltage so that loaded work piece is reliable and stable.
In order to achieve the above object, the present invention proposes a kind of power supply active filter, and this power supply active filter includes input voltage measurement module, output voltage detection module and VRM Voltage Regulator Module；The input of described input voltage measurement module and the input of described VRM Voltage Regulator Module are all connected with power input, the outfan of described input voltage measurement module is connected with the first detection input of described VRM Voltage Regulator Module, the outfan of described VRM Voltage Regulator Module is connected with the input of power output end and described output voltage detection module respectively, and the outfan of described output voltage detection module is connected with the second detection input of described VRM Voltage Regulator Module；Wherein:
Described input voltage measurement module is used for detecting power input voltage, it is carried out ripple and filters, it is thus achieved that ripple filter after described power input voltage in minimum DC voltage, and using this DC voltage as reference voltage；
Described output voltage detection module is used for detecting electric power output voltage；
Described VRM Voltage Regulator Module is for comparing the described electric power output voltage detected with described reference voltage, and according to comparative result, regulates described electric power output voltage, so that it follows the change of described reference voltage.
Preferably, described VRM Voltage Regulator Module includes voltage comparison unit, voltage amplification unit and voltage-regulation control unit；The first input end of described voltage comparison unit is as the first detection input of described VRM Voltage Regulator Module, it is connected with the outfan of described input voltage measurement module, second input of described voltage comparison unit is as the second detection input of described VRM Voltage Regulator Module, it is connected with the outfan of described output voltage detection module, the outfan of described voltage comparison unit is connected with the input of described voltage amplification unit, the outfan of described voltage amplification unit is connected with the control end of described voltage-regulation control unit, the input of described voltage-regulation control unit is as the input of described VRM Voltage Regulator Module, it is connected with described power input, the outfan of described voltage-regulation control unit is as the outfan of described VRM Voltage Regulator Module, it is connected with described power output end；Wherein:
Described voltage comparison unit is for relatively described electric power output voltage and described reference voltage, output error signal；
Described voltage amplification unit is for being amplified described error signal processing, it is thus achieved that the error signal after amplification；
Described voltage-regulation control unit is for according to the error signal after this amplification, regulating described electric power output voltage, so that it follows the change of described reference voltage.
Preferably, described input voltage measurement module includes a diode, the first resistance and an electric capacity；The negative electrode of described diode is connected with described power input as the input of described input voltage measurement module；The anode of described diode is through described capacity earth, and as the outfan of described input voltage measurement module, is connected with the first input end of described voltage comparison unit；Described first resistance and described diodes in parallel.
Preferably, described output voltage detection module includes the second resistance；One end of described second resistance is as the outfan of described output voltage detection module, it is connected with the second input of described voltage comparison unit, the other end of described second resistance, as the input of described output voltage detection module, is connected with the outfan of described voltage-regulation control unit.
Preferably, described voltage comparison unit includes the first audion and the second audion；The base stage of described first audion, as the first input end of described voltage comparison unit, is connected with the anode of described diode, and the emitter stage of described first audion is connected with the emitter stage of described second audion；The colelctor electrode of described second audion, as the outfan of described voltage comparison unit, is connected with the input of described voltage amplification unit；The base stage of described second audion, as the second input of described voltage comparison unit, is connected with one end of described second resistance.
Preferably, described voltage amplification unit includes the 3rd audion；The base stage of described 3rd audion connects as the input of described voltage amplification unit, it is connected with the colelctor electrode of described second audion, the colelctor electrode of described 3rd audion is as the outfan of described voltage amplification unit, it is connected with the control end of described voltage-regulation control unit, the grounded emitter of described 3rd audion.
Preferably, described voltage-regulation control unit includes the first auxiliary power supply end, the second auxiliary power supply end, the 4th audion and a field effect transistor；Wherein:
The base stage of described 4th audion is as the control end of described voltage-regulation control unit, it is connected with the colelctor electrode of described 3rd audion, and be connected with described first auxiliary power supply end, the grounded emitter of described 4th audion, the described colelctor electrode of the 4th audion is connected with the grid of described field effect transistor；The drain electrode of described field effect transistor, as the input of described voltage-regulation control unit, is connected with described power input；The grid of described second auxiliary power supply end and described field effect transistor, and be connected with the colelctor electrode of described first audion；The source electrode of described field effect transistor, as the outfan of described voltage-regulation control unit, is connected with the other end of described second resistance, and is connected with described power output end.
The present invention also proposes the filtering method of a kind of power supply active filter, and this filtering method comprises the following steps:
Step S10: input voltage measurement module detection power input voltage, carries out ripple to it and filters, it is thus achieved that ripple filter after described power input voltage in minimum DC voltage, and using this DC voltage as reference voltage；
Step S20: output voltage detection module detection electric power output voltage；
Step S30: the described electric power output voltage detected is compared by VRM Voltage Regulator Module with described reference voltage, according to comparative result, regulates described electric power output voltage, so that it follows the change of described reference voltage.
Preferably, described step S30 includes:
Step S31: the more described electric power output voltage of voltage comparison unit and described reference voltage, output error signal；
Step S32: described error signal is amplified processing by voltage amplification unit, it is thus achieved that the error signal after amplification；
Step S33: voltage-regulation control unit, according to the error signal after this amplification, regulates described electric power output voltage, so that it follows the change of described reference voltage.
The power supply active filter of present invention proposition and filtering method thereof, first pass through input voltage measurement module detection power input voltage, power input voltage filters ripple process, obtain DC voltage minimum in the power input voltage after ripple filters, and using this DC voltage as reference voltage, electric power output voltage is detected again through output voltage detection module, then pass through VRM Voltage Regulator Module the electric power output voltage detected and reference voltage to be compared, output error signal after comparing, it is amplified this error signal processing, obtain the error signal after amplifying, according to the error signal after this amplification, regulate electric power output voltage, so that electric power output voltage follows reference voltage change.The present invention using the DC voltage of the ripple voltage signal in filter out power input voltage as reference voltage, by reverse adjustment, electric power output voltage is made to follow the change of this reference voltage, reach the purpose of power supply active power filtering, and power supply has and significantly high filters performance, electric power output voltage is stably exported, and then makes loaded work piece reliable and stable.Meanwhile, the present invention also has circuit structure advantages of simple, and the number of elements of use is few, with low cost, advantage stable and reliable in work.
Accompanying drawing explanation
Fig. 1 is the theory diagram of power supply active filter preferred embodiment of the present invention；
Fig. 2 is the circuit diagram of power supply active filter one embodiment of the present invention；
Fig. 3 is the schematic flow sheet of the filtering method preferred embodiment of power supply active filter of the present invention；
Fig. 4 be power supply active filter of the present invention filtering method in the schematic flow sheet of step S30 mono-embodiment.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Technical scheme is further illustrated below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
The present invention proposes a kind of power supply active filter.
With reference to the theory diagram that Fig. 1, Fig. 1 are power supply active filter preferred embodiment of the present invention.
In the embodiment of the present invention, power supply active filter includes input voltage measurement module 100, output voltage detection module 200 and VRM Voltage Regulator Module 300.
The input of input voltage measurement module 100 and the input of VRM Voltage Regulator Module 300 are all connected with power input VI, the outfan of input voltage measurement module 100 is connected with the first detection input of VRM Voltage Regulator Module 300, the outfan of VRM Voltage Regulator Module 300 is connected with the input of power output end VO and output voltage detection module 200 respectively, and the outfan of output voltage detection module 200 is connected with the second detection input of VRM Voltage Regulator Module 300.
In the present embodiment, input voltage measurement module 100 is used for detecting power input voltage, power input voltage is carried out ripple and filters, it is thus achieved that ripple filter after power input voltage in minimum DC voltage, and using this DC voltage as reference voltage；
Output voltage detection module 200 is used for detecting electric power output voltage；
VRM Voltage Regulator Module 300 is for comparing the electric power output voltage detected with reference voltage, and according to comparative result, regulates electric power output voltage, so that it follows reference voltage change, namely makes electric power output voltage keep consistent with reference voltage.
Specifically, VRM Voltage Regulator Module 300 includes voltage comparison unit 310, voltage amplification unit 320 and voltage-regulation control unit 330.
The first input end of voltage comparison unit 310 is as the first detection input of VRM Voltage Regulator Module 300, it is connected with the outfan of input voltage measurement module 100, second input of voltage comparison unit 310 is as the second detection input of VRM Voltage Regulator Module 300, it is connected with the outfan of output voltage detection module 200, the outfan of voltage comparison unit 310 is connected with the input of voltage amplification unit 320, the outfan of voltage amplification unit 320 is connected with the control end of voltage-regulation control unit 330, the input of voltage-regulation control unit 330 is as the input of VRM Voltage Regulator Module 300, it is connected with power input VI, the outfan of voltage-regulation control unit 330 is as the outfan of VRM Voltage Regulator Module 300, it is connected with power output end VO.
In the present embodiment, voltage comparison unit 310 is used for comparing electric power output voltage and reference voltage, output error signal；Voltage amplification unit 320 is for being amplified error signal processing, it is thus achieved that the error signal after amplification；Voltage-regulation control unit 330 is for according to the error signal after this amplification, regulating electric power output voltage, so that it follows reference voltage change.
In conjunction with the theory diagram that Fig. 1 and Fig. 2, Fig. 1 are power supply active filter preferred embodiment of the present invention；Fig. 2 is the circuit diagram of power supply active filter one embodiment of the present invention.
In the present embodiment, input voltage measurement module 100 includes diode D1, the first resistance R1 and electric capacity C1；The negative electrode of diode D1 is as the input of input voltage measurement module 100, it is connected with power input VI, the anode of diode D1 is through electric capacity C1 ground connection, and the anode of diode D1 is as the outfan of input voltage measurement module 100, is connected with the first input end of voltage comparison unit 310；First resistance R1 and diode D1 is in parallel.
Diode D1, the first resistance R1 and electric capacity C1 form an asymmetric integrating circuit, in the present embodiment, the charge constant of electric capacity C1 is different with discharge time constant, when power input voltage is electric capacity C1 charging, power input voltage passes through the first resistance R1, owing to the resistance of the first resistance R1 is big so that the charging rate of electric capacity C1 is slow, the speed that the voltage at electric capacity C1 two ends rises is slow；And when the voltage at electric capacity C1 two ends is more than power input voltage, electric capacity C1 discharges, and the voltage of now electric capacity C1 release is by diode D1, owing to the internal resistance of diode D1 is little, the velocity of discharge making electric capacity C1 is fast, and then makes the speed that the voltage at electric capacity C1 two ends declines fast.If the charge constant setting electric capacity C1 is more than three times that requirement filters ripple voltage time constant, then the voltage at electric capacity C1 two ends is considered as by the minima institute clamper of power input voltage, thus detection goes out minimum DC voltage.Simultaneously by the second resistance R2 real-time sampling detection electric power output voltage.
Specifically, output voltage detection module 200 includes the second resistance R2；One end of second resistance R2 is as the outfan of output voltage detection module 200, it is connected with the second input of voltage comparison unit 310, the other end of the second resistance R2, as the input of output voltage detection module 200, is connected with the outfan of voltage-regulation control unit 330.
The present embodiment adopts the voltage output voltage of detection voltage regulation unit output by the second resistance R2, this voltage output voltage is fed back to voltage comparison unit 310, compares with reference voltage.
Specifically, voltage comparison unit 310 includes the first audion Q1 and the second audion Q2, and wherein the first audion Q1 is NPN type triode, and the second audion Q2 is PNP type triode；The base stage of the first audion Q1, as the first input end of voltage comparison unit 310, is connected with the anode of diode D1, and the emitter stage of the first audion Q1 and the emitter stage of the second audion Q2 connect；The colelctor electrode of the second audion Q2 is successively through the 3rd resistance R3 and the four resistance R4 ground connection, and the 3rd the common port of resistance R3 and the four resistance R4 as the outfan of voltage comparison unit 310, it is connected with the input of voltage amplification unit 320, second audion Q2 base stage, as the second input of voltage comparison unit 310, is connected with one end of the second resistance R2.
In voltage comparison unit 310, detection is gone out minimum DC voltage and is added to the base stage of the first audion Q1, as reference voltage, the electric power output voltage detected is added to the base stage of the second audion Q2 simultaneously, effect by the first audion Q1 and the second audion Q2, electric power output voltage and reference voltage are compared, by the error voltage of the second audion Q2 out-put supply output voltage after comparing and reference voltage.
Specifically, voltage amplification unit 320 includes the 3rd audion Q3, and wherein, the 3rd audion Q3 is NPN type triode；The base stage of the 3rd audion Q3 connects as the input of voltage amplification unit 320, it is connected with the colelctor electrode of the second audion Q2, the colelctor electrode of the 3rd audion Q3 is as the outfan of voltage amplification unit 320, it is connected with the control end of voltage-regulation control unit 330, the grounded emitter of the 3rd audion Q3.
In voltage amplification unit 320, the error voltage that the second audion Q2 exports is amplified processing by the 3rd audion Q3 so that the error voltage of output is more stable.
Specifically, voltage-regulation control unit 330 includes the first auxiliary power supply end V1, the second auxiliary power supply end V2, the 4th audion Q4 and field effect transistor Q5, and wherein, the 4th audion Q4 is NPN type triode, and field effect transistor Q5 is N-channel field effect transistor.
Wherein, the base stage of the 4th audion Q4 is as the control end of voltage-regulation control unit 330, it is connected with the colelctor electrode of the 3rd audion Q3, and the 4th the base stage of audion Q4 connect through the 5th resistance R5 and the first auxiliary power supply end V1, the grounded emitter of the 4th audion Q4, the colelctor electrode of the 4th audion Q4 is connected through the grid of the 6th resistance R6 and field effect transistor Q5；The drain electrode of field effect transistor Q5, as the input of voltage-regulation control unit 330, is connected with power input VI, and is connected to the first filter capacitor C2 between power input VI and ground；The colelctor electrode of the second auxiliary power supply end V2 and the first audion Q1 connects, and the second auxiliary power supply end V2 is connected through the grid of the 7th resistance R7 and field effect transistor Q5；The source electrode of field effect transistor Q5, as the outfan of voltage-regulation control unit 330, is connected with the other end of the second resistance R2, and is connected with power output end VO, and is connected to the second filter capacitor C3 between power output end VO and ground.
In voltage-regulation control unit 330, it is amplified the error voltage after processing through the 3rd audion Q3 and is coupled to the grid of field effect transistor Q5 by the 4th audion Q4, control field effect transistor Q5 electric power output voltage is reversely regulated, electric power output voltage is made to follow reference voltage change, namely electric power output voltage is made to keep consistent with reference voltage, it is achieved the active power filtering of power supply.
The operation principle of the present embodiment circuit as shown in Figure 2 particularly as follows:
Power input voltage inputs from power input VI, by the first resistance R1, charges for electric capacity C1, and the voltage at electric capacity C1 two ends rises；When the voltage at electric capacity C1 two ends is more than power input voltage, electric capacity C1 discharges, now electric capacity C1 is discharged by diode D1, the voltage at electric capacity C1 two ends is by the minima institute clamper of power input voltage, thus detection goes out minimum DC voltage, the base stage of the first audion Q1 it is added to, as reference voltage through this DC voltage；Simultaneously by the second resistance R2 real-time sampling detection electric power output voltage, the electric power output voltage detected is added to the base stage of the second audion Q2, effect by the first audion Q1 and the second audion Q2, electric power output voltage and reference voltage are compared, error voltage by the second audion Q2 out-put supply output voltage after comparing and reference voltage, this error voltage is added to the base stage of the 3rd audion Q3, this error voltage is amplified processing by the 3rd audion Q3, obtains the error voltage after stable amplification.Then the grid of field effect transistor Q5 it is coupled to by the 4th audion Q4 by being amplified the error voltage after processing through the 3rd audion Q3, control field effect transistor Q5 electric power output voltage is reversely regulated, electric power output voltage is made to follow reference voltage change, namely make electric power output voltage keep consistent with reference voltage, reach the purpose of power supply active power filtering.
The power supply active filter that the present invention proposes, power input voltage is detected by input voltage measurement module 100, power input voltage filters ripple process, obtain DC voltage minimum in the power input voltage after ripple filters, and using this DC voltage as reference voltage, detect electric power output voltage by output voltage detection module 200 simultaneously, then pass through VRM Voltage Regulator Module 300 electric power output voltage detected and reference voltage to be compared, output error signal after comparing, it is amplified this error signal processing, obtain the error signal after amplifying, according to the error signal after this amplification, regulate electric power output voltage, so that electric power output voltage keeps consistent with reference voltage, reach the purpose of power supply active power filtering, and power supply has and significantly high filters performance, electric power output voltage is stably exported, and then make loaded work piece reliable and stable.The power supply active filter that the present invention proposes simultaneously has circuit structure advantages of simple, and the number of elements of use is few, with low cost, advantage stable and reliable in work.
The present invention also proposes the filtering method of a kind of power supply active filter.
Schematic flow sheet with reference to the filtering method preferred embodiment that Fig. 3, Fig. 3 are power supply active filter of the present invention.
The filtering method of the power supply active filter that the embodiment of the present invention proposes comprises the following steps:
Step S10: input voltage measurement module detection power input voltage, carries out ripple to it and filters, it is thus achieved that ripple filter after power input voltage in minimum DC voltage, and using this DC voltage as reference voltage；
Step S20: output voltage detection module detection electric power output voltage；
Step S30: the electric power output voltage detected is compared by VRM Voltage Regulator Module with reference voltage, according to comparative result, regulates electric power output voltage, so that it follows reference voltage change.
Schematic flow sheet in conjunction with the filtering method preferred embodiment that Fig. 3 and Fig. 4, Fig. 3 are power supply active filter of the present invention；Fig. 4 be power supply active filter of the present invention filtering method in the schematic flow sheet of step S30 mono-embodiment.
In the present embodiment, in step S30, the electric power output voltage detected is compared by VRM Voltage Regulator Module with reference voltage, according to comparative result, regulates electric power output voltage, so that it follows reference voltage change, comprises the following steps:
Step S31: voltage comparison unit compares electric power output voltage and reference voltage, output error signal；
Step S32: error signal is amplified processing by voltage amplification unit, it is thus achieved that the error signal after amplification；
Step S33: voltage-regulation control unit, according to the error signal after this amplification, regulates electric power output voltage, so that it follows reference voltage change.
The filtering method of the power supply active filter that the present invention proposes, first input voltage measurement module detection power input voltage, power input voltage filters ripple process, obtain DC voltage minimum in the power input voltage after ripple filters, and using this DC voltage as reference voltage, output voltage detection module detection electric power output voltage, then the electric power output voltage detected and reference voltage are compared by VRM Voltage Regulator Module, output error signal after comparing, it is amplified this error signal processing, obtain the error signal after amplifying, according to the error signal after this amplification, regulate electric power output voltage, so that electric power output voltage follows reference voltage change.The present invention using the DC voltage of the ripple voltage signal in filter out power input voltage as reference voltage, by reverse adjustment, electric power output voltage is made to follow the change of this reference voltage, reach the purpose of power supply active power filtering, and this filtering method has and significantly high filters performance, electric power output voltage is stably exported, and then makes loaded work piece reliable and stable.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure utilizing description of the present invention and accompanying drawing content to make or equivalence flow process conversion; or directly or indirectly it is used in other relevant technical fields, all in like manner include in the scope of patent protection of the present invention.
Claims (8)
1. a power supply active filter, it is characterised in that include input voltage measurement module, output voltage detection module and VRM Voltage Regulator Module；The input of described input voltage measurement module and the input of described VRM Voltage Regulator Module are all connected with power input, the outfan of described input voltage measurement module is connected with the first detection input of described VRM Voltage Regulator Module, the outfan of described VRM Voltage Regulator Module is connected with the input of power output end and described output voltage detection module respectively, and the outfan of described output voltage detection module is connected with the second detection input of described VRM Voltage Regulator Module；Wherein:
Described input voltage measurement module is used for detecting power input voltage, it is carried out ripple and filters, it is thus achieved that ripple filter after described power input voltage in minimum DC voltage, and using this DC voltage as reference voltage；
Described output voltage detection module is used for detecting electric power output voltage；
Described VRM Voltage Regulator Module is for comparing the described electric power output voltage detected with described reference voltage, and according to comparative result, regulates described electric power output voltage, so that it follows the change of described reference voltage；
Described VRM Voltage Regulator Module includes voltage comparison unit, voltage amplification unit and voltage-regulation control unit；The first input end of described voltage comparison unit is as the first detection input of described VRM Voltage Regulator Module, it is connected with the outfan of described input voltage measurement module, second input of described voltage comparison unit is as the second detection input of described VRM Voltage Regulator Module, it is connected with the outfan of described output voltage detection module, the outfan of described voltage comparison unit is connected with the input of described voltage amplification unit, the outfan of described voltage amplification unit is connected with the control end of described voltage-regulation control unit, the input of described voltage-regulation control unit is as the input of described VRM Voltage Regulator Module, it is connected with described power input, the outfan of described voltage-regulation control unit is as the outfan of described VRM Voltage Regulator Module, it is connected with described power output end；Wherein:
Described voltage comparison unit is for relatively described electric power output voltage and described reference voltage, output error signal；
Described voltage amplification unit is for being amplified described error signal processing, it is thus achieved that the error signal after amplification；
Described voltage-regulation control unit is for according to the error signal after this amplification, regulating described electric power output voltage, so that it follows the change of described reference voltage；
Described voltage comparison unit includes the first audion and the second audion；The base stage of described first audion, as the first input end of described voltage comparison unit, is connected with the outfan of described input voltage measurement module, and the emitter stage of described first audion is connected with the emitter stage of described second audion；The colelctor electrode of described second audion, as the outfan of described voltage comparison unit, is connected with the input of described voltage amplification unit；The base stage of described second audion, as the second input of described voltage comparison unit, is connected with the outfan of described output voltage detection module；
Described voltage-regulation control unit includes the second auxiliary power supply end, and described second auxiliary power supply end is connected with the colelctor electrode of described first audion.
2. power supply active filter as claimed in claim 1, it is characterised in that described input voltage measurement module includes a diode, the first resistance and an electric capacity；The negative electrode of described diode is connected with described power input as the input of described input voltage measurement module；The anode of described diode is through described capacity earth, and as the outfan of described input voltage measurement module, is connected with the first input end of described voltage comparison unit；Described first resistance and described diodes in parallel.
3. power supply active filter as claimed in claim 2, it is characterised in that described output voltage detection module includes the second resistance；One end of described second resistance is as the outfan of described output voltage detection module, it is connected with the second input of described voltage comparison unit, the other end of described second resistance, as the input of described output voltage detection module, is connected with the outfan of described voltage-regulation control unit.
4. power supply active filter as claimed in claim 3, it is characterised in that the base stage of described first audion, as the first input end of described voltage comparison unit, is connected with the anode of described diode；The base stage of described second audion, as the second input of described voltage comparison unit, is connected with one end of described second resistance.
5. power supply active filter as claimed in claim 4, it is characterised in that described voltage amplification unit includes the 3rd audion；The base stage of described 3rd audion connects as the input of described voltage amplification unit, it is connected with the colelctor electrode of described second audion, the colelctor electrode of described 3rd audion is as the outfan of described voltage amplification unit, it is connected with the control end of described voltage-regulation control unit, the grounded emitter of described 3rd audion.
6. power supply active filter as claimed in claim 5, it is characterised in that described voltage-regulation control unit also includes the first auxiliary power supply end, the 4th audion and a field effect transistor；Wherein:
The base stage of described 4th audion is as the control end of described voltage-regulation control unit, it is connected with the colelctor electrode of described 3rd audion, and be connected with described first auxiliary power supply end, the grounded emitter of described 4th audion, the described colelctor electrode of the 4th audion is connected with the grid of described field effect transistor；The drain electrode of described field effect transistor, as the input of described voltage-regulation control unit, is connected with described power input；The grid of described second auxiliary power supply end and described field effect transistor, and be connected with the colelctor electrode of described first audion；The source electrode of described field effect transistor, as the outfan of described voltage-regulation control unit, is connected with the other end of described second resistance, and is connected with described power output end.
7. the filtering method of a power supply active filter as claimed in claim 1, it is characterised in that comprise the following steps:
Step S10: input voltage measurement module detection power input voltage, carries out ripple to it and filters, it is thus achieved that ripple filter after described power input voltage in minimum DC voltage, and using this DC voltage as reference voltage；
Step S20: output voltage detection module detection electric power output voltage；
Step S30: the described electric power output voltage detected is compared by VRM Voltage Regulator Module with described reference voltage, according to comparative result, regulates described electric power output voltage, so that it follows the change of described reference voltage.
8. filtering method as claimed in claim 7, it is characterised in that described step S30 includes:
Step S31: the more described electric power output voltage of voltage comparison unit and described reference voltage, output error signal；
Step S32: described error signal is amplified processing by voltage amplification unit, it is thus achieved that the error signal after amplification；
Step S33: voltage-regulation control unit, according to the error signal after this amplification, regulates described electric power output voltage, so that it follows the change of described reference voltage.
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| CN201210499365.4A CN103001474B (en) | 2012-11-29 | 2012-11-29 | Power supply active filter and filtering method thereof |
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| CN201210499365.4A CN103001474B (en) | 2012-11-29 | 2012-11-29 | Power supply active filter and filtering method thereof |
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| CN103001474B true CN103001474B (en) | 2016-06-29 |
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| CN201210499365.4A Expired - Fee Related CN103001474B (en) | 2012-11-29 | 2012-11-29 | Power supply active filter and filtering method thereof |
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| CN104993470B (en) * | 2015-06-29 | 2017-09-19 | 南京航空航天大学 | A kind of control mode of the active filter of DC link |
| CN105511546B (en) * | 2015-12-01 | 2017-05-03 | 深圳市华星光电技术有限公司 | Gamma reference voltage ripple filtering circuit and LCD |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101815386A (en) * | 2010-04-30 | 2010-08-25 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
| EP2264877A1 (en) * | 2009-06-18 | 2010-12-22 | Alcatel Lucent | Active filter for DC power supply. |
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| JPH03204012A (en) * | 1989-12-29 | 1991-09-05 | Shindengen Electric Mfg Co Ltd | Dropper type constant voltage circuit |
| JPH08147050A (en) * | 1994-11-18 | 1996-06-07 | Sony Corp | Power circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2264877A1 (en) * | 2009-06-18 | 2010-12-22 | Alcatel Lucent | Active filter for DC power supply. |
| CN101815386A (en) * | 2010-04-30 | 2010-08-25 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
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| CN103001474A (en) | 2013-03-27 |
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