CN103986317A - Filter circuit with power frequency output - Google Patents
Filter circuit with power frequency output Download PDFInfo
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- CN103986317A CN103986317A CN201410234376.9A CN201410234376A CN103986317A CN 103986317 A CN103986317 A CN 103986317A CN 201410234376 A CN201410234376 A CN 201410234376A CN 103986317 A CN103986317 A CN 103986317A
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Abstract
The invention provides a filter circuit with power frequency output. The filter circuit comprises an electrolytic capacitor, a metal film capacitor, a conversion circuit and a power frequency inversion circuit. The electrolytic capacitor, the metal film capacitor and a converter are connected in parallel. The power frequency inversion circuit is connected with the converter in series. The filter circuit is characterized by further comprising an iron powder core inductor. The iron powder core inductor is connected between the electrolytic capacitor and the metal film capacitor in series. The problem that in a power circuit with power frequency output, due to high-frequency ripple currents generated by the electrolytic capacitor, the service life of the electrolytic capacitor and the metal film capacitor is shortened is solved. The filter circuit with power frequency output can be used for effectively restraining the high-frequency ripple currents on the electrolytic capacitor, reducing loss caused by high-frequency ripples, slowing down temperature raise, greatly improving reliability of the power circuit and greatly prolonging the service life of the power circuit.
Description
Technical field
The present invention relates to electronic circuit field, specifically be the filter circuit of a kind of power frequency output.
Background technology
The operation of all electronic products all will be attached on the basis of energy support, the importance of visible power supply, determine a life-span that key factor is electrochemical capacitor of power supply length in useful life, and the ripple current producing in electrochemical capacitor process there is vital impact to the life-span of electrochemical capacitor.
In the Switching Power Supply of direct current input, electrochemical capacitor plays the effect of energy storage and low frequency filtering, the capacitance of electrochemical capacitor is larger, in the time that needs provide larger high-frequency current, can on electrochemical capacitor, produce the high frequency ripple electric current of larger effective value, existing solution is the high frequency ripple electric current that Low ESR electric metal membrane capacitances more in parallel reduce electrochemical capacitor in the position near electrochemical capacitor.Metal film electric capacity has filtering high frequency ripple and the effect of high-frequency current is provided, its capacitance is much smaller than electrochemical capacitor, and in powerful LLC series resonance translation circuit, be the high-frequency current of the switching frequency of converter owing to requiring incoming frequency, in the time that the power of converter is very large, because the capacitance of metal film electric capacity is less, enough high-frequency energies cannot be provided, therefore a large amount of high-frequency currents that produce on electrochemical capacitor increase the effective value that causes the ripple current on electrochemical capacitor, temperature rise raises, shorten the life-span of electrochemical capacitor, for electrochemical capacitor, the every raising 10 of temperature rise
°, its life-span approximately declines one times.And the electric current that flows into metal film electric capacity also can produce a large amount of radio-frequency components simultaneously, also caused the current effective value of metal film electric capacity to increase simultaneously, temperature rise raises, and the life-span shortens, and does not have effect by the method for metal film electric capacity in parallel.Therefore, be necessary to provide a kind of method that can effectively suppress electrolytic capacitor high-frequency lines, to solve because high frequency lines causes the problem that electrochemical capacitor and metal film electric capacity life-span shorten.
Summary of the invention
Technical problem to be solved by this invention is: solve the high frequency ripple electric current producing due to electrochemical capacitor and cause the life-span of electrochemical capacitor and metal film electric capacity to shorten problem in the power circuit of power frequency output frequently, a kind of high frequency ripple electric current that can effectively suppress on electrochemical capacitor is provided, reduce the loss being produced by high frequency ripple, reduce temperature rise, greatly improve the filter circuit of the power frequency output in power circuit reliability and useful life.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
A kind of filter circuit of power frequency output, comprise electrochemical capacitor, metal film electric capacity, translation circuit and power frequency inverter circuit, described electrochemical capacitor, metal film electric capacity and converter are connected in parallel, described power frequency inverter circuit and converter are connected in series, also comprise ferrocart core inductor, described ferrocart core inductor is connected between described electrochemical capacitor and metal film electric capacity.
Beneficial effect of the present invention is: difference causes shorten the useful life of electrochemical capacitor with the filter circuit of existing power frequency output because a large amount of high-frequency electrical that produce on electrochemical capacitor fail to be convened for lack of a quorum, and a large amount of radio-frequency components cause its current effective value to increase after flowing into metal film electric capacity equally, temperature rise raises, the problem that life-span shortens, the filtered circuit of a kind of power frequency output provided by the invention, by the ferrocart core inductor of connecting between electrochemical capacitor and metal film electric capacity, because ferrocart core inductor has autonomous demagnetization, saturation flux density is higher, the characteristic that inductance coefficent is lower, the high-frequency current that the induction reactance that ferrocart core inductor produces produces electrochemical capacitor is inhibited, can effectively reduce ripple current on electrochemical capacitor, reduce temperature rise, greatly improve the filter circuit of the power frequency output in power circuit reliability and useful life.
Brief description of the drawings
Fig. 1 is the circuit structure diagram of the filter circuit of a kind of power frequency output of prior art;
Fig. 2 is the circuit diagram of the filter circuit of a kind of power frequency output of the embodiment of the present invention;
Fig. 3 is the current waveform figure that the electrochemical capacitor in the filter circuit construction of power frequency output of prior art is exported in oscilloscope:
Fig. 4 is the oscillogram of the high-frequency current component of the generation on electrochemical capacitor while being 100Hz of the envelope frequency in the filter circuit construction of existing power frequency output;
Fig. 5 is the Charge-discharge wave shape figure of electrochemical capacitor in the filter circuit one specific implementation example of a kind of power frequency of embodiment of the present invention output;
Fig. 6 is the Charge-discharge wave shape figure of electrochemical capacitor in the filter circuit of prior art;
Fig. 7 is the oscillogram of ripple current on electrochemical capacitor in the filter circuit one specific implementation example of a kind of power frequency of embodiment of the present invention output.
Fig. 8 is the oscillogram of ripple current on the electrochemical capacitor of filter circuit of prior art.
Label declaration:
Electrochemical capacitor E1; Metal film capacitor C 1; Ferrocart core inductor L1.
Embodiment
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, below in conjunction with execution mode and coordinate accompanying drawing to be explained in detail.
The design of most critical of the present invention is: by the ferrocart core inductor L1 that connects between electrochemical capacitor E1 and metal film capacitor C 1, due to the independently characteristic of demagnetization of ferrocart core inductor L1, the induction reactance that ferrocart core inductor L1 produces can have good prefabricated effect to the upper high-frequency current producing of electrochemical capacitor E1, can effectively suppress the high frequency ripple electric current on electrochemical capacitor E1, reduce the loss being produced by high frequency ripple, reduce temperature rise, greatly improve the filter circuit of the power frequency output in power circuit reliability and useful life.
Referring to Fig. 1, is the circuit structure diagram of the filter circuit of a kind of power frequency of prior art output.
The filter circuit of existing a kind of power frequency output, comprise electrochemical capacitor E1, metal film capacitor C 1, LLC converter and power frequency inverter, described electrochemical capacitor E1, metal film capacitor C 1 and LLC converter are connected in parallel, and described power frequency inverter and LLC converter are connected in series.
Taking input voltage as 200V direct voltage, be output as 220V/50Hz, load band 8KW resistive load inverter is example, and wherein E1 is that capacitance is that the electrochemical capacitor E1 of 11 220uF/350V composes in parallel, and total capacity is 2200uF; C1 is the metalized film capacitor parallel connection of 10 2.2uF/400V, and total capacity is 22uF; Thus on the filter of direct-flow input end, the half-sinusoid waveform that the upper electric current envelope embodying of electrochemical capacitor E1E1 is 100Hz, is comprising the ripple current of high frequency on envelope, and the frequency of high frequency ripple electric current is the work at present frequency of LLC converter.
Refer to Fig. 3, the current waveform figure that the electrochemical capacitor E1 while being 100Hz for the envelope frequency in the filter circuit construction of existing power frequency output exports in oscilloscope.
Refer to Fig. 4, the oscillogram of the high-frequency current component of the generation while being 100Hz for the envelope frequency in the filter circuit construction of existing power frequency output on electrochemical capacitor E1.
Referring to Fig. 2, is the circuit diagram of the filter circuit of a kind of power frequency of embodiment of the present invention output.
A kind of filter circuit of power frequency output, comprise electrochemical capacitor E1, metal film capacitor C 1, translation circuit and power frequency inverter circuit, described electrochemical capacitor E1, metal film capacitor C 1 and converter are connected in parallel, and described power frequency inverter circuit and converter are connected in series, and also comprise ferrocart core inductor L1; Described ferrocart core inductor L1 is connected between described electrochemical capacitor E1 and metal film capacitor C 1.
From foregoing description, beneficial effect of the present invention is: by the ferrocart core inductor L1 that connects between electrochemical capacitor E1 and metal film capacitor C 1, due to the independently characteristic of demagnetization of ferrocart core inductor L1, the high-frequency current that the induction reactance that ferrocart core inductor L1 produces produces electrochemical capacitor E1 is inhibited, in the time that the input current of translation circuit is high-frequency current, can effectively suppress the high frequency ripple electric current on electrochemical capacitor E1, reduce the loss being produced by high frequency ripple, reduce temperature rise, greatly improve reliability and useful life, further, the present invention need not change the framework of whole filter circuit, do not affect the various features of circuit, only need to increase a ferrocart core inductor L1, inductor volume is little, make simple.
In this programme, in the time that the filter circuit of 50Hz power frequency output is normally worked, because the output characteristic of inverter circuit determines, the low frequency that the input and output electric current envelope of translation circuit is 100Hz, on envelope, carrying the electric current of the radio-frequency component of its switching frequency, this electric current is provided by the metal film capacitor C 1 in filter circuit and energy storage electrochemical capacitor E1, the output current envelope of electrochemical capacitor E1 is 100Hz, between electrochemical capacitor E1 and metal film capacitor C 1, use ferrocart core inductor L1 series coupled, induction reactance on ferrocart core to high-frequency current by stronger inhibitory action, stop high-frequency current to change fast, therefore can play good inhibition to the upper high frequency ripple electric current producing of electrochemical capacitor E1.Ferrocart core inductor L1 adopts the coiling of ferrocart core magnet ring, and ferrocart core magnet ring not only saturation flux density is higher, can be unsaturated in the time having larger flip-flop electric current, and inductance value can remain unchanged substantially; And the inductance coefficent of ferrocart core magnet ring is lower, while being made into inductor, its inductance value is very little, be far smaller than the inductance value of the resonant inductance of translation circuit in filter circuit, the ferrocart core inductor L1 therefore being turned to by ferrocart core magnet ring can not exert an influence to the normal operating characteristic of circuit.
Further, described ferrocart core inductor L1 is for using ferrocart core magnet ring coiling one circle to make.In this programme, the ferrocart core inductor L1 number of turn only needs coiling one circle, near the crest of the 100Hz of electrochemical capacitor E1 envelope, high-frequency current is played to good inhibitory action, at near zero-crossing point, because electric current drops to 0, independently demagnetization of inductance, does not need additionally to increase degaussing circuit.
Further, described power frequency inverter circuit comprises UPS uninterrupted power supply.It is upper that this programme is applicable to UPS, can utilize the output characteristic (cycle of the every 100HZ of output current can cross 0) of inverter circuit to realize autonomous demagnetization, avoids saturated inefficacy.And in the Switching Power Supply of general direct current output, direct current causes inductance saturated and lost efficacy.
Further, described filter circuit also comprises rectification circuit, and described translation circuit is connected with power frequency inverter circuit after connecting rectification circuit.
Further, described translation circuit is LLC translation circuit.
Further, described LLC translation circuit comprises the first field effect transistor, the second field effect transistor, the 3rd field effect transistor, the 4th field effect transistor, inductance, electric capacity and transformer, the first field effect transistor is connected in series afterwards and is connected in parallel with same the 3rd field effect transistor being connected in series and the 4th field effect transistor with the second field effect transistor, one end of inductance is connected with the source electrode of the first field effect transistor, is connected the drain electrode of the 3rd field effect transistor after winding of the other end and transformer and capacitances in series.
A specific implementation example of the present invention is:
Comprise electrochemical capacitor E1, metal film capacitor C 1, LLC converter and power frequency inverter, described electrochemical capacitor E1, metal film capacitor C 1 and LLC converter are connected in parallel, and described LLC converter is connected with power frequency inverter after connecting rectifier.Also comprise ferrocart core inductor L1; Described ferrocart core inductor L1 is connected between described electrochemical capacitor E1 and metal film capacitor C 1.
The direct voltage of 200V does input source, directly receives input electrochemical capacitor E1E1 upper, and wherein E1 capacitance is the electrochemical capacitor E1 parallel connection of 11 220uF/350V, and total capacity is 2200uF; C1 is the metalized film capacitor parallel connection of 10 2.2uF/400V, and total capacity is 22uF; L1 is the ferrocart core inductor L1 that ferrocart core magnet ring coiling one circle is made.Inverter output voltage is the power frequency ac voltage of 220V/50Hz, in crest and trough moment power output maximum, less near zero-crossing point power.Thus on the filter of direct-flow input end, the half-sinusoid waveform that the upper electric current envelope embodying of electrochemical capacitor E1E1 is 100Hz, is comprising the ripple current of high frequency on envelope, and the frequency of high frequency ripple electric current is the work at present frequency of LLC converter.
In the time that inverter output connects load, the LLC converter input current of DC-DC is high-frequency ac current, and due to the inhibitory action of ferrocart core inductor L1L1 to high-frequency current, the radio-frequency component electric current that electrochemical capacitor E1E1 flows out can diminish, DC component increases, and keeps total effective value constant.Because the capacitance of electrochemical capacitor E1E1 is larger, the low-frequency current that therefore input current of electrochemical capacitor E1 is 100Hz.Input current is constant, and output current high frequency composition diminishes, and DC component increases, and therefore total charging and discharging currents effective value of electrochemical capacitor E1 can reduce, the resistive loss P of electrochemical capacitor E1
efor:
Wherein I
rmsfor the effective value of electrochemical capacitor E1 charging or discharging current, R
eSRfor the internal resistance of electrochemical capacitor E1.
Because the interchange output characteristic of inverter, the cycle of flowing through the each 100Hz of electric current of ferrocart core inductance L 1 had for 0 moment, and therefore inductance L 1 autonomous demagnetization at this moment, can saturatedly not lose efficacy.
In 200V direct current input, in the situation of inverter band 8KW load, the filter circuit to prior art and filter circuit of the present invention are tested respectively.
Test result refers to Fig. 5 and Fig. 6, and Fig. 5 is the Charge-discharge wave shape figure of electrochemical capacitor E1 in the filter circuit one specific implementation example of a kind of power frequency of embodiment of the present invention output; Fig. 6 is the Charge-discharge wave shape figure of electrochemical capacitor E1 in the filter circuit of prior art.
After comparison diagram 5 and Fig. 6, can find out, under the condition of identical input voltage and load, the charging current waveform of the electrochemical capacitor E1 of two kinds of filter circuits is basic identical; But the radio-frequency component of discharging current is larger under the filter circuit of prior art, and high-frequency electric field composition under filter circuit of the present invention is less.Wherein, black waveform is charging current waveform, and grey color part is discharge current waveform.
The ripple effective value Current calculation method of electrochemical capacitor E1 is as follows:
Wherein T is 1/100Hz=10mS;
Refer to Fig. 7 and Fig. 8, Fig. 7 is the oscillogram of the upper ripple current of electrochemical capacitor E1 in the filter circuit one specific implementation example of a kind of power frequency of embodiment of the present invention output; Fig. 8 is the oscillogram of the upper ripple current of electrochemical capacitor E1 of the filter circuit of prior art.The ripple current that can obviously find out dark part from figure has obvious difference, and the ripple current in the filter circuit of a kind of power frequency output of the present invention is significantly less than the ripple current in prior art volume filter circuit.
The computing function that uses oscilloscope to provide calculates the ripple current effective value I of electrochemical capacitor E1 under filter circuit of the present invention
rms=15.7A, and the ripple current effective value I of electrochemical capacitor E1 under the filter circuit of prior art
rms=25.3A.The filter circuit of visible a kind of power frequency output of the present invention has the effect of the upper ripple current effective value of obvious reduction electrochemical capacitor E1.
And the resistive loss P of electrochemical capacitor E1
efor:
Therefore under the filter circuit of prior art the resistive loss of electrochemical capacitor E1 be electrochemical capacitor E1 under filter circuit of the present invention impedance loss 25.3
2/ 15.7
2=2.6 times.
For electrochemical capacitor E1,10 DEG C of the every raisings of temperature rise, its life-span approximately declines one times, therefore, in the case of the loss that reduces by 2.6 times, is quite obvious to the raising in useful life.
Owing to having suppressed the radio-frequency component of electrochemical capacitor E1 output current, therefore for metalized film capacitor C1, ripple current effective value on it also will reduce, in actual measurement, electrochemical capacitor E1 temperature rise has reduced by 30 DEG C, metalized film capacitor temperature rise reduces by 25 DEG C, to its useful life and reliability having played quite good effect.
In sum, the filter circuit of a kind of power frequency output provided by the invention, not only utilize ferrocart core inductor L1 can autonomous demagnetization, saturation flux density is higher, the characteristic that inductance coefficent is lower, the high-frequency current that the induction reactance that can produce ferrocart core inductor L1 produces electrochemical capacitor E1 is inhibited, can effectively reduce the upper ripple current of electrochemical capacitor E1, reduce temperature rise, greatly improve power circuit reliability and useful life; And the ripple current in less metal film capacitor C 1 simultaneously, increase life-span of metal film capacitor C 1; Further, in filter circuit of the present invention, translation circuit is connected with power frequency inverter circuit after connecting rectification circuit, can effectively improve the filter capacity of circuit.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (6)
1. the filter circuit of a power frequency output, comprise electrochemical capacitor, metal film electric capacity, translation circuit and power frequency inverter circuit, described electrochemical capacitor, metal film electric capacity and converter are connected in parallel, described power frequency inverter circuit and converter are connected in series, it is characterized in that, also comprise ferrocart core inductor, described ferrocart core inductor is connected between described electrochemical capacitor and metal film electric capacity.
2. the filter circuit of a kind of power frequency output according to claim 1, is characterized in that, described ferrocart core inductor is for using ferrocart core magnet ring coiling one circle to make.
3. the filter circuit of a kind of power frequency output according to claim 1, is characterized in that, described power frequency inverter circuit comprises UPS uninterrupted power supply.
4. the filter circuit of a kind of power frequency output according to claim 1, is characterized in that, described filter circuit also comprises rectification circuit, and described translation circuit is connected with power frequency inverter circuit after connecting rectification circuit.
5. the filter circuit of a kind of power frequency output according to claim 1, is characterized in that, described translation circuit is LLC translation circuit.
6. the filter circuit of a kind of power frequency output according to claim 5, it is characterized in that, described LLC translation circuit comprises the first field effect transistor, the second field effect transistor, the 3rd field effect transistor, the 4th field effect transistor, inductance, electric capacity and transformer, the first field effect transistor is connected in series afterwards and is connected in parallel with same the 3rd field effect transistor being connected in series and the 4th field effect transistor with the second field effect transistor, one end of inductance is connected with the source electrode of the first field effect transistor, is connected the drain electrode of the 3rd field effect transistor after winding of the other end and transformer and capacitances in series.
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| CN103618336A (en) * | 2013-12-09 | 2014-03-05 | 盐城工学院 | Output digital modulation circuit and control system of rectifier type high-frequency chain grid-connected inverter |
| CN103684324A (en) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | Low-ripple wave filtering device |
| CN203933370U (en) * | 2014-05-29 | 2014-11-05 | 深圳市英可瑞科技开发有限公司 | A kind of filter circuit of power frequency output |
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2014
- 2014-05-29 CN CN201410234376.9A patent/CN103986317A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056049A (en) * | 2006-04-14 | 2007-10-17 | 台达电子工业股份有限公司 | Power supplier and its ripple attenuation device |
| US20120051110A1 (en) * | 2009-06-05 | 2012-03-01 | Nphysics, Inc. | Dc-to-ac power inverter and methods |
| CN201781429U (en) * | 2010-07-29 | 2011-03-30 | 上海儒竞电子科技有限公司 | Low-voltage input direct DC-AC conversion circuit adopting full-bridge inversion |
| CN202059319U (en) * | 2011-05-04 | 2011-11-30 | 台达电子企业管理（上海）有限公司 | Power supply low pass filter circuit |
| CN102324836A (en) * | 2011-09-16 | 2012-01-18 | 华南理工大学 | Output filtering circuit of high-power low-voltage large-current high-frequency switch power supply device |
| CN103684324A (en) * | 2013-11-28 | 2014-03-26 | 成都位时通科技有限公司 | Low-ripple wave filtering device |
| CN103618336A (en) * | 2013-12-09 | 2014-03-05 | 盐城工学院 | Output digital modulation circuit and control system of rectifier type high-frequency chain grid-connected inverter |
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Address after: Nanshan District Ma Liuzhou Industrial Zone of Shenzhen City, Guangdong province 518052 77 two or three storey Applicant after: Shenzhen increte Polytron Technologies Inc Address before: Nanshan District Ma Liuzhou Industrial Zone Shenzhen city Guangdong province 518000 building 77 Applicant before: Shenzhen Increase Technology Development Co., Ltd. |
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Application publication date: 20140813 |