CN102142767A - Output filter circuit suitable for large current output electrochemical industrial power supply - Google Patents
Output filter circuit suitable for large current output electrochemical industrial power supply Download PDFInfo
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- CN102142767A CN102142767A CN2011100822178A CN201110082217A CN102142767A CN 102142767 A CN102142767 A CN 102142767A CN 2011100822178 A CN2011100822178 A CN 2011100822178A CN 201110082217 A CN201110082217 A CN 201110082217A CN 102142767 A CN102142767 A CN 102142767A
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- inductance
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- power supply
- filter circuit
- capacitor
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Abstract
The invention provides an output filter circuit suitable for a large current output electrochemical industrial power supply. One output end of a rectification output module of the power supply is connected with one end of a first inductor and one end of a fourth inductor; the other end of the first inductor is connected with one end of a third inductor and one end of a load; the other end of the fourth inductor is connected with one end of a second capacitor; the other end of the second capacitor is connected with the other end of the load and one end of a second inductor; the other end of the third inductor is connected with one end of a first capacitor; and the other end of the first capacitor and the other end of the second inductor are together connected to the other output end of the rectification output module of the power supply. In the invention, the problem of excessively large ripples, which is caused by a filter capacitor and a lead parasitic inductor thereof, of an output voltage in the large current output places is solved, so that a direct current (DC) output high-frequency switch power supply can realize zero-ripple output. Therefore, the output filter circuit is very suitable for the DC large current output power supply in the electrochemical industries of electrolysis, electroplating and the like.
Description
Technical field
The present invention relates to be output as the output technical field of filtering of the high frequency switch power of direct current, be specifically related to a kind of output filter circuit that is applicable to big electric current output electrochemical industry power supply.
Background technology
The high frequency switch power that is output as direct current at present extensively adopts single-stage LC filter circuit in output filtering link, i.e. main circuit crosstalk sense and electric capacity come filtering high frequency ripple (as Fig. 1).In the less occasion of output current, voltage fluctuation on the equivalent series inductance of filter capacitor itself and the electric capacity lead-in inductance (hereinafter to be referred as stray inductance) is smaller, therefore the influence of stray inductance is very unobvious, uses single-stage LC filter circuit just can obtain satisfied filter effect.But in the occasion of big electric current output, the voltage fluctuation on the stray inductance increases greatly, and its negative effect is more obvious.At this moment, only use the LC filter circuit just to be difficult to obtain more satisfactory filter effect.The present invention has eliminated the negative effect of capacitive branch stray inductance well, dexterously these parasitic parameters are absorbed in the filter circuit, and, make the high frequency switch power of direct current output can realize zero ripple output by the design of inductance capacitance parameter matching, solved above-mentioned problem satisfactorily.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of output filter circuit that is applicable to big electric current output electrochemical industry power supply is provided.The present invention is applicable to the output filtering link of the high frequency switch power that is output as direct current, by the structural design of circuit, the inductance capacitance parasitic parameter on the absorbable thread road is realized the high frequency ripple filtering under the heavy DC output occasion, thereby realize zero ripple output, concrete technical scheme is as follows:
A kind of output filter circuit that is applicable to big electric current output electrochemical industry power supply comprises first inductance, second inductance, the 3rd inductance, the 4th inductance, first electric capacity and second electric capacity; An output of the rectification output module of described power supply is connected with an end of first inductance, an end of the 4th inductance; The other end of first inductance is connected with an end of the 3rd inductance, an end of load; The other end of the 4th inductance is connected with an end of second electric capacity, and the other end of second electric capacity is connected with an end of the other end of load, second inductance; The other end of the 3rd inductance is connected with an end of first electric capacity, and the other end of the other end of first electric capacity and second inductance is connected in another output of the rectification output module of described power supply jointly.
In the above-mentioned output filter circuit that is applicable to big electric current output electrochemical industry power supply, the connection line with stray inductance that adopts more than in described first inductance, second inductance, the 3rd inductance, the 4th inductance replaces.
In the above-mentioned output filter circuit that is applicable to big electric current output electrochemical industry power supply, the value of first inductance, second inductance, the 3rd inductance and the 4th inductance equates, and the value of first electric capacity and second electric capacity equates.
In the above-mentioned output filter circuit that is applicable to big electric current output electrochemical industry power supply, the series arm at described the 3rd inductance and the first electric capacity place adopts more than one inductance element and the series connection of more than one capacity cell to constitute; The series arm at described the 4th inductance and the second electric capacity place adopts more than one inductance element and the series connection of more than one capacity cell to constitute.
In the above-mentioned output filter circuit that is applicable to big electric current output electrochemical industry power supply, described inductance element is replaced with more than one inductance element series-parallel connection, and described capacity cell is replaced with more than one capacity cell series-parallel connection.
The output filter circuit of big electric current output electrochemical industry power supply that is applicable to of the present invention makes output voltage U
oTo input voltage U
iGain U
o/ U
iReduce rapidly with the increase of frequency, when four inductance and two electric capacity kept respectively equating in the circuit, it is best that filter effect reaches, and can realize the zero ripple output of big electric current output electrochemical industry power supply.
Compared with prior art the present invention has following advantage: circuit structure of the present invention is applicable to the multiple output filtering link that is output as the high frequency switch power of direct current, realizes the high frequency ripple filtering under the heavy DC output occasion, thereby realizes zero ripple output.In the less occasion of output current, the voltage fluctuation on the equivalent series inductance of filter capacitor itself and the electric capacity lead-in inductance is smaller, so the influence of stray inductance is very unobvious, uses traditional single-stage LC filter circuit just can obtain satisfied filter effect.But in the occasion of big electric current output, the voltage fluctuation on the stray inductance increases greatly, and its negative effect is more obvious.At this moment, only use the LC filter circuit just to be difficult to obtain more satisfactory filter effect.Because the parasitic parameter of element is difficult to eliminate fully in the side circuit, therefore, if adopt traditional LC filtering, then can produces bigger voltage fluctuation on the stray inductance of filter capacitor branch road in the circuit, thereby cause very big output ripple during D.C. high-current output.As further improved plan, the present invention can also also be used for the filtering high frequency ripple with the stray inductance of filter capacitor branch road, thereby the change negative factor is active factor, and the change uncontrollable factor is controllable factor.The present invention has eliminated the negative effect of capacitive branch stray inductance well, dexterously these parasitic parameters are absorbed in the filter circuit, draw described output filter circuit, make the high frequency switch power of direct current output can realize zero ripple output, solved above-mentioned problem satisfactorily.
Description of drawings
Fig. 1 is a traditional single stage LC filter circuit schematic diagram.
Fig. 2 is applicable in the specific embodiment of the invention that (load is a resistance R for the output filter circuit instance graph of big electric current output electrochemical industry power supply
L).
Fig. 3 is an inductance L in the output filter circuit shown in Figure 2
1=L
2=L
3=L
4=1mH, capacitor C
1=C
2=1mF, load R
LInput voltage u during=1 Ω
iTo output voltage u
oThe Bode diagram of transfer function.
Fig. 4 is an inductance L in the output filter circuit shown in Figure 2
1=L
2=L
3=L
4=1mH, capacitor C
1=C
2=1mF, load R
L=1 Ω, u
i=15+10sin(2 * 10
4π) emulation gained input voltage u when (V)
iAnd output voltage u
oOscillogram.
Embodiment
Below in conjunction with accompanying drawing and example concrete enforcement of the present invention is further described, but enforcement of the present invention and protection range are not limited thereto.
As shown in Figure 2, a kind of output filter circuit that is applicable to big electric current output electrochemical industry power supply of present embodiment comprises first inductance L
1, second inductance L
2, the 3rd inductance L
3, the 4th inductance L
4, first capacitor C
1With second capacitor C
2The output of the rectification output module of described power supply and first inductance L
1An end, the 4th inductance L
4An end be connected; First inductance L
1The other end and the 3rd inductance L
3An end, an end of load be connected; The 4th inductance L
4The other end and second capacitor C
2An end connect second capacitor C
2The other end and the other end, second inductance L of load
2An end be connected; The 3rd inductance L
3The other end and first capacitor C
1An end connect first capacitor C
1The other end and second inductance L
2The other end be connected in another output of the rectification output module of described power supply jointly.The big I of these inductance and electric capacity comprises parasitic parameter in the circuit.First inductance L
1, second inductance L
2, the 3rd inductance L
3, the 4th inductance L
4With first capacitor C
1, second capacitor C
2The common output filtering link of forming.
The above-mentioned output filter circuit that is applicable to big electric current output electrochemical industry power supply, the output of the rectification output module of Switching Power Supply and first inductance L
1An end, the 4th inductance L
4An end be connected to a bit; First inductance L
1The other end and the 3rd inductance L
3An end, an end of load be connected to a bit; The 4th inductance L
4The other end and second capacitor C
2An end connect second capacitor C
2The other end and the other end, second inductance L of load
2An end be connected to a bit; The 3rd inductance L
3The other end and first capacitor C
1An end connect first capacitor C
1The other end and second inductance L
2The other end be connected in another output of the rectification output module of Switching Power Supply jointly.
As embodiment, the 3rd inductance L
3Can constitute by the inductance connection in series-parallel of any amount, and itself and first capacitor C
1The position can exchange, when the 3rd inductance L
3When constituting by two or more inductance series connection, first capacitor C
1Can be in the centre of any two series inductances; The 4th corresponding inductance L
4Can constitute by the inductance connection in series-parallel of any amount, and itself and second capacitor C
2The position can exchange, when the 4th inductance L
4When constituting by two or more inductance series connection, second capacitor C
2Can be in the centre of any two series inductances.
As embodiment, the 3rd inductance L
3Also can be by first capacitor C
1And the stray inductance of lead-in wire composition, still not satisfying the demands as if inductance value then can be in first capacitor C
1Lead-in wire on series inductance; The 4th inductance L
4Can be by second capacitor C
2And the stray inductance of lead-in wire composition, still not satisfying the demands as if inductance value then can be in second capacitor C
2Lead-in wire on series inductance.
Among Fig. 2, first inductance L
1, second inductance L
2, the 3rd inductance L
3, the 4th inductance L
4With first capacitor C
1, second capacitor C
2Common output filtering link, the output voltage U formed
oTo input voltage U
iGain (U
o/ U
i) big or small by regulating first inductance L
1, second inductance L
2, the 3rd inductance L
3, the 4th inductance L
4With first capacitor C
1, second capacitor C
2Value change.Output voltage U
oTo input voltage U
iGain (U
o/ U
i) reduce with the increase of frequency, when first inductance L
1, second inductance L
2, the 3rd inductance L
3With the 4th inductance L
4Value equate and first capacitor C
1With second capacitor C
2Value when equating, output ripple is zero.
In the filter circuit of present embodiment mode, inductance L
1=L
2=L
3=L
4And capacitor C
1=C
2The time filter effect reach best, use mesh current analysis and try to achieve input voltage u putting before this
iTo output voltage u
oTransfer function as the formula (1).
（1）
Work as inductance L
1=L
2=L
3=L
4=1mH, capacitor C
1=C
2=1mF, load R
LDuring=1 Ω, substitution formula (1) can get input voltage u this moment
iTo output voltage u
oTransfer function as the formula (2), and the Bode diagram of this transfer function of drawing thus is as shown in Figure 3.
Fig. 4 has provided in the output filter circuit that is applicable to big electric current output electrochemical industry power supply shown in Figure 2, inductance L
1=L
2=L
3=L
4=1mH, capacitor C
1=C
2=1mF, load R
L=1 Ω, u
i=15+10sin(2 * 10
4π) emulation gained input voltage u when (V)
iAnd output voltage u
oWaveform.
As seen, the present invention is applicable to the multiple output filter circuit that is output as the high frequency switch power of direct current, can realize the high frequency ripple filtering under the heavy DC output occasion, thereby realizes zero ripple output.The invention solves filter capacitor and the lead-in wire stray inductance causes the excessive problem of output voltage ripple, make the large power supply, particularly electrochemical industry such as electrolysis, plating power supply of D.C. high-current output can realize zero ripple output.
Claims (5)
1. an output filter circuit that is applicable to big electric current output electrochemical industry power supply is characterized in that comprising the first inductance (L
1), the second inductance (L
2), the 3rd inductance (L
3), the 4th inductance (L
4), the first electric capacity (C
1) and the second electric capacity (C
2); The output of the rectification output module of described power supply and the first inductance (L
1) an end, the 4th inductance (L
4) an end be connected; First inductance (the L
1) the other end and the 3rd inductance (L
3) an end, an end of load be connected; The 4th inductance (L
4) the other end and the second electric capacity (C
2) an end connect the second electric capacity (C
2) the other end and the other end, the second inductance (L of load
2) an end be connected; The 3rd inductance (L
3) the other end and the first electric capacity (C
1) an end connect the first electric capacity (C
1) the other end and the second inductance (L
2) the other end be connected in another output of the rectification output module of described power supply jointly.
2. the output filter circuit that is applicable to big electric current output electrochemical industry power supply according to claim 1 is characterized in that the described first inductance (L
1), the second inductance (L
2), the 3rd inductance (L
3), the 4th inductance (L
4) in the connection line that adopts more than with stray inductance replace.
3. the output filter circuit that is applicable to big electric current output electrochemical industry power supply according to claim 1 is characterized in that described the 3rd inductance (L
3) and the first electric capacity (C
1) series arm at place adopts more than one inductance element and the series connection of more than one capacity cell to constitute; Described the 4th inductance (L
4) and the second electric capacity (C
2) series arm at place adopts more than one inductance element and the series connection of more than one capacity cell to constitute.
4. the output filter circuit that is applicable to big electric current output electrochemical industry power supply according to claim 1 is characterized in that the first inductance (L
1), the second inductance (L
2), the 3rd inductance (L
3), the 4th inductance (L
4) in have more than one with a plurality of inductance element series-parallel connections and replace the described first electric capacity (C
1), the second electric capacity (C
2) in have more than one with a plurality of capacity cell series-parallel connections and replace.
5. according to each described output filter circuit that is applicable to big electric current output electrochemical industry power supply of claim 1 ~ 4, it is characterized in that the first inductance (L
1), the second inductance (L
2), the 3rd inductance (L
3) and the 4th inductance (L
4) value equate and the first electric capacity (C
1) and the second electric capacity (C
2) value equate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110082217 CN102142767B (en) | 2011-04-01 | 2011-04-01 | Output filter circuit suitable for large current output electrochemical industrial power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110082217 CN102142767B (en) | 2011-04-01 | 2011-04-01 | Output filter circuit suitable for large current output electrochemical industrial power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102142767A true CN102142767A (en) | 2011-08-03 |
| CN102142767B CN102142767B (en) | 2013-05-08 |
Family
ID=44410067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110082217 Expired - Fee Related CN102142767B (en) | 2011-04-01 | 2011-04-01 | Output filter circuit suitable for large current output electrochemical industrial power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102142767B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009201034A (en) * | 2008-02-25 | 2009-09-03 | Mitsubishi Electric Corp | Filter circuit |
| CN201450491U (en) * | 2009-09-14 | 2010-05-05 | 宝鸡市瑞通电器有限公司 | Alternating current two-section filter |
| CN201656919U (en) * | 2009-09-18 | 2010-11-24 | 河北博威集成电路有限公司 | Integrated filter |
| CN202026238U (en) * | 2011-04-01 | 2011-11-02 | 华南理工大学 | Output filter circuit suitable for heavy current output electrochemical industrial power source |
-
2011
- 2011-04-01 CN CN 201110082217 patent/CN102142767B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009201034A (en) * | 2008-02-25 | 2009-09-03 | Mitsubishi Electric Corp | Filter circuit |
| CN201450491U (en) * | 2009-09-14 | 2010-05-05 | 宝鸡市瑞通电器有限公司 | Alternating current two-section filter |
| CN201656919U (en) * | 2009-09-18 | 2010-11-24 | 河北博威集成电路有限公司 | Integrated filter |
| CN202026238U (en) * | 2011-04-01 | 2011-11-02 | 华南理工大学 | Output filter circuit suitable for heavy current output electrochemical industrial power source |
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| Publication number | Publication date |
|---|---|
| CN102142767B (en) | 2013-05-08 |
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Granted publication date: 20130508 Termination date: 20200401 |
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