CN103001474A - Active power filter device of power source and filter method thereof - Google Patents
Active power filter device of power source and filter method thereof Download PDFInfo
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Abstract
The invention discloses an active power filter device of a power source and a filter method thereof. The filter method comprises the following steps: an input voltage detection module detects power source input voltage and performs filtering treatment on the power source input voltage to obtain reference voltage; an output voltage detection module detects power source output voltage; and a voltage adjusting module compares the detected power source output voltage with the reference voltage and adjusts the power source output voltage according to the comparison results to enable the power source output voltage to change along with the reference voltage. The active power filter device uses direct-current voltage of the filtered ripple voltage signals in the power source input voltage as the reference voltage and enables power source output voltage to change along with the reference voltage through retroegulation so as to achieve the aim of active filtering of the power source, and the power source has high filtering performance, enables the power source output voltage to be output stably and further enables the load to work stably and reliably. The active power filter device of the power source has the advantages of being simple and reasonable in circuit structure, small in number of used elements, low in cost and stable and reliable in work.
Description
Technical field
The present invention relates to power technique fields, relate in particular to a kind of power supply active filter and filtering method thereof.
Background technology
Switching Power Supply is to utilize modern power electronics technology, and the time ratio that the control switch transistor turns on and off is kept a kind of power supply of regulated output voltage.Switching Power Supply generally is made of pulse width modulation control IC and switch element spare (MOSFET, BJT etc.).
The Switching Power Supply high frequency is the direction of its development, and high frequency makes the Switching Power Supply miniaturization, and makes Switching Power Supply enter widely application, particularly in the application of high-technology field, has promoted miniaturization, the lighting of new high-tech product.In addition the development of Switching Power Supply be applied in energy savings, economize on resources and the protection of the environment aspect all has great importance.
But Switching Power Supply also has shortcoming, and for example electromagnetic interference is very large, and electromagnetic compatibility was not easy, and needing increases the problem that extra cost solves electromagnetic compatibility, and response speed is slow.This is determined by its principle, therefore the output ripple voltage of Switching Power Supply is large, its ripple voltage includes high frequency ripple and low-frequency ripple, wherein high frequency ripple gets final product filtering by the LC filter circuit, but because tens low-frequency ripples to the hundreds of hertz that load variations causes are difficult to filtering, it means that passive power filter unit will have enough low cut-off frequency, also require to have enough ripple damping capacities, also want simultaneously to bear large electric current, present this passive filtering unit can't be realized.The result who brings like this makes loaded work piece unstable, even can make the undesired or protective circuit misoperation of loaded work piece.
Summary of the invention
Main purpose of the present invention is to propose a kind of power supply active filter and filtering method thereof, is intended to the ripple voltage in the filter out power input voltage, and the stabilized power supply output voltage is 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 comprises input voltage detection module, output voltage detection module and Voltage Regulator Module; The input of described input voltage detection module be connected the input of Voltage Regulator Module and all be connected with power input, the output of described input voltage detection module detects input with first of described Voltage Regulator Module and is connected, the output of described Voltage Regulator Module respectively with power output end be connected the input of output voltage detection module and be connected, the output of described output voltage detection module detects input with second of described Voltage Regulator Module and is connected; Wherein:
Described input voltage detection module carries out the ripple filtering for detection of power input voltage to it, obtains minimum direct voltage in the described power input voltage after the ripple filtering, and with this direct voltage as reference voltage;
Described output voltage detection module is for detection of electric power output voltage;
Described electric power output voltage and described reference voltage that described Voltage Regulator Module is used for detecting compare, and according to comparative result, regulate described electric power output voltage, change so that it follows described reference voltage.
Preferably, described Voltage Regulator Module comprises voltage comparison unit, voltage amplification unit and voltage-regulation control unit; The first input end of described voltage comparison unit detects input as first of described Voltage Regulator Module, be connected with the output of described input voltage detection module, the second input of described voltage comparison unit detects input as second of described Voltage Regulator Module, be connected with the output of described output voltage detection module, the output of described voltage comparison unit is connected with the input of described voltage amplification unit, the output 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 Voltage Regulator Module, be connected with described power input, the output of described voltage-regulation control unit is connected with described power output end as the output of described Voltage Regulator Module; Wherein:
Described voltage comparison unit is used for more described electric power output voltage and described reference voltage, output error signal;
Described voltage amplification unit is used for described error signal is amplified processing, the error signal after obtaining to amplify;
Described voltage-regulation control unit is used for regulating described electric power output voltage according to the error signal after this amplification, changes so that it follows described reference voltage.
Preferably, described input voltage detection module comprises 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 detection module; The anode of described diode is through described capacity earth, and as the output of described input voltage detection module, is connected with the first input end of described voltage comparison unit; Described the first resistance and described diodes in parallel.
Preferably, described output voltage detection module comprises the second resistance; One end of described the second resistance is as the input of described output voltage detection module, be connected with the second input of described voltage comparison unit, the other end of described the second resistance is connected with the output of described voltage-regulation control unit as the output of described output voltage detection module.
Preferably, described voltage comparison unit comprises the first triode and the second triode; The base stage of described the first triode is as the first input end of described voltage comparison unit, and with the anodic bonding of described diode, the emitter of described the first triode is connected with the emitter of described the second triode; The collector electrode of described the second triode is connected with the input of described voltage amplification unit as the output of described voltage comparison unit; The base stage of described the second triode is connected with an end of described the second resistance as the second input of described voltage comparison unit.
Preferably, described voltage amplification unit comprises the 3rd triode; The base stage of described the 3rd triode connects as the input of described voltage amplification unit, be connected with the collector electrode of described the second triode, the collector electrode of described the 3rd triode is as the output of described voltage amplification unit, be connected the grounded emitter of described the 3rd triode with the control end of described voltage-regulation control unit;
Preferably, described voltage-regulation control unit comprises the first auxiliary power supply end, the second auxiliary power supply end, the 4th triode and a field effect transistor; Wherein:
The base stage of described the 4th triode is as the control end of described voltage-regulation control unit, be connected with the collector electrode of described the 3rd triode, and be connected with described the first auxiliary power supply end, the grounded emitter of described the 4th triode, the collector electrode of described the 4th triode is connected with the grid of described field effect transistor; The drain electrode of described field effect transistor is connected with described power input as the input of described voltage-regulation control unit; The grid of described the second auxiliary power supply end and described field effect transistor, and be connected with the collector electrode of described the first triode; The source electrode of described field effect transistor is connected with the other end of described the second resistance, and is connected with described power output end as the output of described voltage-regulation control unit.
The present invention also proposes a kind of filtering method of power supply active filter, and this filtering method may further comprise the steps:
Step S10: the input voltage detection module detects power input voltage, and it is carried out the ripple filtering, obtains minimum direct voltage in the described power input voltage after the ripple filtering, and with this direct voltage as reference voltage;
Step S20: the output voltage detection module detects electric power output voltage;
Step S30: the described electric power output voltage that Voltage Regulator Module will detect and described reference voltage relatively according to comparative result, are regulated described electric power output voltage, change so that it follows described reference voltage.
Preferably, described step 30 comprises:
Step S31: the more described electric power output voltage of voltage comparison unit and described reference voltage, output error signal;
Step S32: the voltage amplification unit amplifies processing with described error signal, the error signal after obtaining to amplify;
Step S33: the error signal after the voltage-regulation control unit amplifies according to this, regulate described electric power output voltage, so that following described reference voltage, it changes.
Power supply active filter and filtering method thereof that the present invention proposes, at first detect power input voltage by the input voltage detection module, power input voltage is carried out the filtering ripple to be processed, minimum direct voltage in the power input voltage after the filtering of acquisition ripple, and with this direct voltage as reference voltage, detect electric power output voltage by the output voltage detection module again, then by Voltage Regulator Module electric power output voltage and the reference voltage that detects compared, output error signal after relatively, this error signal is amplified processing, error signal after obtaining to amplify, according to the error signal after this amplification, regulate electric power output voltage, change so that electric power output voltage is followed reference voltage.The present invention with the direct voltage of the ripple voltage signal in the filter out power input voltage as reference voltage, by reverse adjusting, so that following this reference voltage, electric power output voltage changes, reach the purpose of power supply active power filtering, and power supply has very high filtering performance, so that the stable output of electric power output voltage, and then so that loaded work piece is reliable and stable.Simultaneously, the present invention also has the circuit structure advantages of simple, and the number of elements of use is few, and is with low cost, the reliable advantage of working stability.
Description of drawings
Fig. 1 is the theory diagram of power supply active filter of the present invention preferred embodiment;
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 is the schematic flow sheet of step S30 one embodiment in the filtering method of power supply active filter of the present invention.
The realization of the object of the invention, functional characteristics and advantage are described further with reference to accompanying drawing in connection with embodiment.
Embodiment
Further specify technical scheme of the present invention below in conjunction with Figure of description and specific embodiment.Should be appreciated that specific embodiment described herein 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 Fig. 1, Fig. 1 is the theory diagram of power supply active filter of the present invention preferred embodiment.
In the embodiment of the invention, the power supply active filter comprises input voltage detection module 100, output voltage detection module 200 and Voltage Regulator Module 300.
The input that the input of input voltage detection module 100 is connected with Voltage Regulator Module all is connected with power input VI, the output of input voltage detection module 100 detects input with first of Voltage Regulator Module 300 and is connected, the output of Voltage Regulator Module 300 is connected with the input that power output end VO is connected with the output voltage detection module respectively, and the output of output voltage detection module 200 detects input with second of Voltage Regulator Module 300 and is connected.
In the present embodiment, input voltage detection module 100 carries out the ripple filtering for detection of power input voltage to power input voltage, obtains minimum direct voltage in the power input voltage after the ripple filtering, and with this direct voltage as reference voltage;
Output voltage detection module 200 is for detection of electric power output voltage;
Particularly, Voltage Regulator Module 300 comprises voltage comparison unit 310, voltage amplification unit 320 and voltage-regulation control unit 330.
The first input end of voltage comparison unit 310 detects input as first of Voltage Regulator Module 300, be connected with the output of input voltage detection module 100, the second input of voltage comparison unit 310 detects input as second of Voltage Regulator Module 300, be connected with the output of output voltage detection module 200, the output of voltage comparison unit 310 is connected with the input of voltage amplification unit 320, the output 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 Voltage Regulator Module 300, VI is connected with power input, the output of voltage-regulation control unit 330 is as the output of Voltage Regulator Module 300, and VO is connected with power output end.
In the present embodiment, voltage comparison unit 310 is used for relatively electric power output voltage and reference voltage, output error signal; Voltage amplification unit 320 is used for error signal is amplified processing, the error signal after obtaining to amplify; Voltage-regulation control unit 330 is used for regulating electric power output voltage according to the error signal after this amplification, changes so that it follows reference voltage.
In conjunction with Fig. 1 and Fig. 2, Fig. 1 is the theory diagram of power supply active filter of the present invention preferred embodiment; Fig. 2 is the circuit diagram of power supply active filter one embodiment of the present invention.
In the present embodiment, input voltage detection module 100 comprises diode D1, the first resistance R 1 and capacitor C 1; The negative electrode of diode D1 is as the input of input voltage detection module 100, VI is connected with power input, the anode of diode D1 is through capacitor C 1 ground connection, and the anode of diode D1 is connected with the first input end of voltage comparison unit 310 as the output of input voltage detection module 100; The first resistance R 1 and diode D1 are in parallel.
Diode D1, the first resistance R 1 and capacitor C 1 form an asymmetric integrating circuit, in the present embodiment, the charge constant of capacitor C 1 is different with discharge time constant, when power input voltage is capacitor C 1 charging, power input voltage is by the first resistance R 1, because the resistance of the first resistance R 1 is large, so that the charging rate of capacitor C 1 is slow, the speed that the voltage at capacitor C 1 two ends rises is slow; And when the voltage at capacitor C 1 two ends during greater than power input voltage, capacitor C 1 discharge, the voltage of capacitor C 1 release this moment is by diode D1, because the internal resistance of diode D1 is little, so that the velocity of discharge of capacitor C 1 is fast, and then so that the speed of the voltage drop at capacitor C 1 two ends is fast.If setting the charge constant of capacitor C 1 is more than three times of requirement filtering ripple voltage time constant, then the voltage at capacitor C 1 two ends is considered as the clamper by the minimum value of power input voltage institute, thereby detection goes out minimum direct voltage.Detect electric power output voltage by the second resistance R 2 real-time samplings simultaneously.
Particularly, output voltage detection module 200 comprises the second resistance R 2; One end of the second resistance R 2 is as the input of output voltage detection module 200, be connected with the second input of voltage comparison unit 310, the other end of the second resistance R 2 is connected with the output of voltage-regulation control unit 330 as the output of output voltage detection module 200.
Present embodiment adopts the Voltage-output voltage that detects the output of voltage-regulation unit by the second resistance R 2, and this Voltage-output Voltage Feedback to voltage comparison unit 310, is compared with reference voltage.
Particularly, voltage comparison unit 310 comprises the first triode Q1 and the second triode Q2, and wherein the first triode Q1 is NPN type triode, and the second triode Q2 is the positive-negative-positive triode; The base stage of the first triode Q1 is as the first input end of voltage comparison unit 310, and with the anodic bonding of diode D1, the emitter of the first triode Q1 is connected with the emitter of the second triode Q2; The collector electrode of the second triode Q2 is successively through the 3rd resistance R 3 and the 4th resistance R 4 ground connection, and the common port of the 3rd resistance R 3 and the 4th resistance R 4 is as the output of voltage comparison unit 310, be connected with the input of voltage amplification unit 320, the second triode Q2 base stage is connected with an end of the second resistance R 2 as the second input of voltage comparison unit 310.
In the voltage comparison unit 310, detection is gone out the base stage that minimum direct voltage is added to the first triode Q1, as reference voltage, simultaneously the electric power output voltage that detects is added to the base stage of the second triode Q2, effect by the first triode Q1 and the second triode Q2, electric power output voltage and reference voltage are compared, with the error voltage of relatively rear the second triode Q2 out-put supply output voltage and reference voltage.
Particularly, voltage amplification unit 320 comprises the 3rd triode Q3, and wherein, the 3rd triode Q3 is NPN type triode; The base stage of the 3rd triode Q3 connects as the input of voltage amplification unit 320, be connected with the collector electrode of the second triode Q2, the collector electrode of the 3rd triode Q3 is as the output of voltage amplification unit 320, be connected the grounded emitter of the 3rd triode Q3 with the control end of voltage-regulation control unit 330;
In the voltage amplification unit 320, the 3rd triode Q3 amplifies processing with the error voltage of the second triode Q2 output, so that the error voltage of output is more stable.
Particularly, voltage-regulation control unit 330 comprises the first auxiliary power supply end V1, the second auxiliary power supply end V2, the 4th triode Q4 and field effect transistor Q5, and wherein, the 4th triode Q4 is NPN type triode, and field effect transistor Q5 is N channel field-effect pipe.
Wherein, the base stage of the 4th triode Q4 is as the control end of voltage-regulation control unit 330, be connected with the collector electrode of the 3rd triode Q3, and the base stage of the 4th triode Q4 is connected with the first auxiliary power supply end V1 through the 5th resistance R 5, the grounded emitter of the 4th triode Q4, the collector electrode of the 4th triode Q4 is connected with the grid of field effect transistor Q5 through the 6th resistance R 6; The drain electrode of field effect transistor Q5 is as the input of voltage-regulation control unit 330, and VI is connected with power input, and is connected with the first filter capacitor C2 between power input VI and the ground; The second auxiliary power supply end V2 is connected with the collector electrode of the first triode Q1, and the second auxiliary power supply end V2 is connected with the grid of field effect transistor Q5 through the 7th resistance R 7; The source electrode of field effect transistor Q5 is connected with the other end of the second resistance R 2, and is connected with power output end VO as the output of voltage-regulation control unit 330, and is connected with the second filter capacitor C3 between power output end VO and the ground.
In the voltage-regulation control unit 330, error voltage after the 3rd triode Q3 amplifies processing is coupled to the grid of field effect transistor Q5 by the 4th triode Q4, control field effect transistor Q5 oppositely regulates electric power output voltage, so that following reference voltage, electric power output voltage changes, namely so that electric power output voltage and reference voltage are consistent, realize the active power filtering of power supply.
The operation principle of present embodiment circuit as shown in Figure 2 is specially:
Power input voltage by the first resistance R 1, is capacitor C 1 charging from power input VI input, and the voltage at capacitor C 1 two ends rises; When the voltage at capacitor C 1 two ends during greater than power input voltage, capacitor C 1 discharge, this moment, capacitor C 1 was by diode D1 discharge, the voltage at capacitor C 1 two ends is by the minimum value of power input voltage institute clamper, thereby detection goes out minimum direct voltage, be added to the base stage of the first triode Q1 through this direct voltage, as reference voltage; Detect electric power output voltage by the second resistance R 2 real-time samplings simultaneously, the electric power output voltage that detects is added to the base stage of the second triode Q2, effect by the first triode Q1 and the second triode Q2, electric power output voltage and reference voltage are compared, error voltage with relatively rear the second triode Q2 out-put supply output voltage and reference voltage, this error voltage is added to the base stage of the 3rd triode Q3, the 3rd triode Q3 amplifies processing with this error voltage, obtains the error voltage after the stable amplification.Then the error voltage after the 3rd triode Q3 amplifies processing is coupled to the grid of field effect transistor Q5 by the 4th triode Q4, control field effect transistor Q5 oppositely regulates electric power output voltage, so that following reference voltage, electric power output voltage changes, namely so that electric power output voltage and reference voltage are consistent, reach the purpose of power supply active power filtering.
The power supply active filter that the present invention proposes, detect power input voltage by input voltage detection module 100, power input voltage is carried out the filtering ripple to be processed, minimum direct voltage in the power input voltage after the filtering of acquisition ripple, and with this direct voltage as reference voltage, detect electric power output voltage by output voltage detection module 200 simultaneously, then by Voltage Regulator Module 300 electric power output voltage and the reference voltage that detects compared, output error signal after relatively, this error signal is amplified processing, error signal after obtaining to amplify, according to the error signal after this amplification, regulate electric power output voltage, so that electric power output voltage and reference voltage are consistent, reach the purpose of power supply active power filtering, and power supply has very high filtering performance, so that the stable output of electric power output voltage, and then so that loaded work piece is reliable and stable.The power supply active filter that simultaneously the present invention proposes has the circuit structure advantages of simple, and the number of elements of use is few, and is with low cost, the reliable advantage of working stability.
The present invention also proposes a kind of filtering method of power supply active filter.
With reference to Fig. 3, Fig. 3 is the schematic flow sheet of the filtering method preferred embodiment of power supply active filter of the present invention.
The filtering method of the power supply active filter that the embodiment of the invention proposes may further comprise the steps:
Step S10: the input voltage detection module detects power input voltage, and it is carried out the ripple filtering, obtains minimum direct voltage in the power input voltage after the ripple filtering, and with this direct voltage as reference voltage;
Step S20: the output voltage detection module detects electric power output voltage;
Step S30: Voltage Regulator Module compares electric power output voltage and the reference voltage that detects, and according to comparative result, regulates electric power output voltage, changes so that it follows reference voltage.
In conjunction with Fig. 3 and Fig. 4, Fig. 3 is the schematic flow sheet of the filtering method preferred embodiment of power supply active filter of the present invention; Fig. 4 is the schematic flow sheet of step S30 one embodiment in the filtering method of power supply active filter of the present invention.
In the present embodiment, Voltage Regulator Module compares electric power output voltage and the reference voltage that detects in the step 30, according to comparative result, regulates electric power output voltage, changes so that it follows reference voltage, may further comprise the steps:
Step S31: voltage comparison unit is electric power output voltage and reference voltage relatively, output error signal;
Step S32: the voltage amplification unit amplifies processing with error signal, the error signal after obtaining to amplify;
Step S33: the error signal after the voltage-regulation control unit amplifies according to this, regulate electric power output voltage, so that following reference voltage, it changes.
The filtering method of the power supply active filter that the present invention proposes, at first the input voltage detection module detects power input voltage, power input voltage is carried out the filtering ripple to be processed, minimum direct voltage in the power input voltage after the filtering of acquisition ripple, and with this direct voltage as reference voltage, the output voltage detection module detects electric power output voltage, then Voltage Regulator Module compares electric power output voltage and the reference voltage that detects, output error signal after relatively, this error signal is amplified processing, error signal after obtaining to amplify, according to the error signal after this amplification, regulate electric power output voltage, change so that electric power output voltage is followed reference voltage.The present invention with the direct voltage of the ripple voltage signal in the filter out power input voltage as reference voltage, by reverse adjusting, so that following this reference voltage, electric power output voltage changes, reach the purpose of power supply active power filtering, and this filtering method has very high filtering performance, so that the stable output of electric power output voltage, and then so that loaded work piece is reliable and stable.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (9)
1. a power supply active filter is characterized in that, comprises input voltage detection module, output voltage detection module and Voltage Regulator Module; The input of described input voltage detection module be connected the input of Voltage Regulator Module and all be connected with power input, the output of described input voltage detection module detects input with first of described Voltage Regulator Module and is connected, the output of described Voltage Regulator Module respectively with power output end be connected the input of output voltage detection module and be connected, the output of described output voltage detection module detects input with second of described Voltage Regulator Module and is connected; Wherein:
Described input voltage detection module carries out the ripple filtering for detection of power input voltage to it, obtains minimum direct voltage in the described power input voltage after the ripple filtering, and with this direct voltage as reference voltage;
Described output voltage detection module is for detection of electric power output voltage;
Described electric power output voltage and described reference voltage that described Voltage Regulator Module is used for detecting compare, and according to comparative result, regulate described electric power output voltage, change so that it follows described reference voltage.
2. power supply active filter as claimed in claim 1 is characterized in that, described Voltage Regulator Module comprises voltage comparison unit, voltage amplification unit and voltage-regulation control unit; The first input end of described voltage comparison unit detects input as first of described Voltage Regulator Module, be connected with the output of described input voltage detection module, the second input of described voltage comparison unit detects input as second of described Voltage Regulator Module, be connected with the output of described output voltage detection module, the output of described voltage comparison unit is connected with the input of described voltage amplification unit, the output 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 Voltage Regulator Module, be connected with described power input, the output of described voltage-regulation control unit is connected with described power output end as the output of described Voltage Regulator Module; Wherein:
Described voltage comparison unit is used for more described electric power output voltage and described reference voltage, output error signal;
Described voltage amplification unit is used for described error signal is amplified processing, the error signal after obtaining to amplify;
Described voltage-regulation control unit is used for regulating described electric power output voltage according to the error signal after this amplification, changes so that it follows described reference voltage.
3. power supply active filter as claimed in claim 1 or 2 is characterized in that, described input voltage detection module comprises 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 detection module; The anode of described diode is through described capacity earth, and as the output of described input voltage detection module, is connected with the first input end of described voltage comparison unit; Described the first resistance and described diodes in parallel.
4. power supply active filter as claimed in claim 3 is characterized in that, described output voltage detection module comprises the second resistance; One end of described the second resistance is as the input of described output voltage detection module, be connected with the second input of described voltage comparison unit, the other end of described the second resistance is connected with the output of described voltage-regulation control unit as the output of described output voltage detection module.
5. such as claim 2 or 4 described power supply active filters, it is characterized in that described voltage comparison unit comprises the first triode and the second triode; The base stage of described the first triode is as the first input end of described voltage comparison unit, and with the anodic bonding of described diode, the emitter of described the first triode is connected with the emitter of described the second triode; The collector electrode of described the second triode is connected with the input of described voltage amplification unit as the output of described voltage comparison unit; The base stage of described the second triode is connected with an end of described the second resistance as the second input of described voltage comparison unit.
6. power supply active filter as claimed in claim 5 is characterized in that, described voltage amplification unit comprises the 3rd triode; The base stage of described the 3rd triode connects as the input of described voltage amplification unit, be connected with the collector electrode of described the second triode, the collector electrode of described the 3rd triode is as the output of described voltage amplification unit, be connected the grounded emitter of described the 3rd triode with the control end of described voltage-regulation control unit.
7. such as claim 2 or 6 described power supply active filters, it is characterized in that described voltage-regulation control unit comprises the first auxiliary power supply end, the second auxiliary power supply end, the 4th triode and a field effect transistor; Wherein:
The base stage of described the 4th triode is as the control end of described voltage-regulation control unit, be connected with the collector electrode of described the 3rd triode, and be connected with described the first auxiliary power supply end, the grounded emitter of described the 4th triode, the collector electrode of described the 4th triode is connected with the grid of described field effect transistor; The drain electrode of described field effect transistor is connected with described power input as the input of described voltage-regulation control unit; The grid of described the second auxiliary power supply end and described field effect transistor, and be connected with the collector electrode of described the first triode; The source electrode of described field effect transistor is connected with the other end of described the second resistance, and is connected with described power output end as the output of described voltage-regulation control unit.
8. the filtering method of a power supply active filter as claimed in claim 1 is characterized in that, may further comprise the steps:
Step S10: the input voltage detection module detects power input voltage, and it is carried out the ripple filtering, obtains minimum direct voltage in the described power input voltage after the ripple filtering, and with this direct voltage as reference voltage;
Step S20: the output voltage detection module detects electric power output voltage;
Step S30: the described electric power output voltage that Voltage Regulator Module will detect and described reference voltage relatively according to comparative result, are regulated described electric power output voltage, change so that it follows described reference voltage.
9. filtering method as claimed in claim 8 is characterized in that, described step 30 comprises:
Step S31: the more described electric power output voltage of voltage comparison unit and described reference voltage, output error signal;
Step S32: the voltage amplification unit amplifies processing with described error signal, the error signal after obtaining to amplify;
Step S33: the error signal after the voltage-regulation control unit amplifies according to this, regulate described electric power output voltage, so that following described reference voltage, it changes.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993470A (en) * | 2015-06-29 | 2015-10-21 | 南京航空航天大学 | Control mode for active filter in DC link |
| WO2017092095A1 (en) * | 2015-12-01 | 2017-06-08 | 深圳市华星光电技术有限公司 | Gamma reference voltage ripple filter circuit and liquid crystal display |
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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 |
| 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. |
-
2012
- 2012-11-29 CN CN201210499365.4A patent/CN103001474B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104993470A (en) * | 2015-06-29 | 2015-10-21 | 南京航空航天大学 | Control mode for active filter in DC link |
| WO2017092095A1 (en) * | 2015-12-01 | 2017-06-08 | 深圳市华星光电技术有限公司 | Gamma reference voltage ripple filter circuit and liquid crystal display |
| US9966020B2 (en) | 2015-12-01 | 2018-05-08 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Gamma reference voltage ripple filter circuit and liquid crystal display |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103001474B (en) | 2016-06-29 |
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