CN102324836B - Output filtering circuit of high-power low-voltage large-current high-frequency switch power supply device - Google Patents
Output filtering circuit of high-power low-voltage large-current high-frequency switch power supply device Download PDFInfo
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- CN102324836B CN102324836B CN201110273689.1A CN201110273689A CN102324836B CN 102324836 B CN102324836 B CN 102324836B CN 201110273689 A CN201110273689 A CN 201110273689A CN 102324836 B CN102324836 B CN 102324836B
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Abstract
The invention provides an output filtering circuit of a high-power low-voltage large-current high-frequency switch power supply device, which comprises an inductance, a capacitor bank, an anode copper bar and a cathode copper bar. The capacitor bank (CZ) consists of N capacitor bars; the capacitor bars have the same structures; each capacitor bar comprises M electrolytic capacitors; N is more than or equal to 1; M is more than or equal to 2; and each electrolytic capacitor is respectively and independently connected to the anode copper bar or the cathode copper bar through a group of lead wires. In the invention, a total current of a capacitance branch in the filtering circuit is shunted by a plurality of electrolytic capacitors so as to greatly reduce ripple waves generated when the current flows parasitic inductances in the electrolytic capacitance branches and achieving a good filtering effect; and compared with a structure that only one large capacitor is used or a plurality of large capacitors are connected in parallel, a structure of using a plurality of capacitor bars has a good heat dissipating effect and small volume. The output filtering circuit is suitable to be used as the output filtering circuit of industrial power supply devices for electrolysis, electroplating and the like or other high-power high-frequency switch power supplies which need a low-voltage large-current output.
Description
Technical field
The present invention relates to the output filtering technical field of the high-power high-frequency switch power supply of low-voltage and high-current output, be specifically related to a kind of output filter circuit of the high-power low-voltage, high-current high frequency switch power device that is applicable to the industrial circles such as electrolysis, plating.
Background technology
The application of high frequency switch power in industrial production is more and more extensive, and for example, as the core of the electrochemical industry power supply equipments such as electrolysis, plating, high frequency switch power generally need to be exported 6 ~ 30V, direct current more than 1000A.And in order to improve processing quality, the ripple of output voltage and electric current is more low better, even some occasion requires the ripple of voltage and current lower than 1%, and this design to power supply output filter circuit is a great difficult problem.
At present direct current high frequency switch power, in output filtering link, extensively adopts single-stage or multistage LC filter circuit, i.e. main circuit crosstalk sense, and several large electric capacity carry out filtering high frequency ripple.Because the electric current of power supply output is very large, filter inductance generally consists of through magnet ring copper bar, and now copper bar is equivalent to the coil of inductance, and the number of turn is generally less than a circle, and this inductance value is very little; Can by and multiple magnet rings improve inductance value, but due to the limited space of supply unit, magnet ring that can be in parallel is limited, therefore total inductance value is smaller.Simultaneously, there is stray inductance in line, output lead between filter capacitor, filter capacitor and output busbar, filter inductance relatively, the value of these stray inductances is considerable, when this makes the large electric current of high-frequency impulse by LC filter, in the stray inductance of line between filter capacitor and filter capacitor and output busbar, produce larger voltage ripple, make the voltage and current ripple of power supply output very large.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of output filter circuit of the high-power low-voltage, high-current high frequency switch power device that is applicable to the industrial circles such as electrolysis, plating is provided.The principle of filter circuit of the present invention is the electric current that flows through filter capacitor branch road by a large amount of reductions, to reduce the voltage by the stray inductance generation of filter capacitor branch road, thereby greatly reduces the ripple of electric power output voltage and electric current, and concrete technical scheme is as follows.
The output filter circuit of high-power low-voltage, high-current high frequency switch power device, comprises inductance L, capacitance group C
z, anodal copper bar and negative pole copper bar; Described capacitance group C
zby N piece electric capacity, row forms, and every electric capacity row's structure is identical, and every electric capacity row all comprises M electrochemical capacitor, N>=1, M>=2; Each electrochemical capacitor is independently connected to anodal copper bar or negative pole copper bar by one group of wire separately.
In the output filter circuit of above-mentioned high-power low-voltage, high-current high frequency switch power device, every electric capacity package is drawn together a pcb board, a M electrochemical capacitor, the anodal copper sheet that connects and is connected copper sheet with negative pole, multiple electrochemical capacitors are arranged on pcb board, the anodal copper sheet that connects is connected with anodal copper bar, negative pole connects copper sheet and is connected with negative pole copper bar, the cathode output end of the each electrochemical capacitor in every electric capacity row is directly connected to the anodal copper sheet that connects by one group of wire, and the cathode output end of each electrochemical capacitor is directly connected to negative pole by one group of wire and connects copper sheet; The positive and negative electrode output that connects each electrochemical capacitor is connected copper sheet one group of wire with positive and negative electrode is independently, and described every group of wire combined by an enamelled wire or many enamelled wires; Every group of wire comprises many enamelled wires, and many enamelled wires of every group of wire, except connecting at the plus or minus utmost point output of electrochemical capacitor, the plus or minus utmost point the place of copper sheet links together, are insulated from each other in other position.
In the output filter circuit of above-mentioned high-power low-voltage, high-current high frequency switch power device, positive pole connection copper sheet in every electric capacity row is screwed the anodal copper bar of power output end, and negative pole connection copper sheet is screwed the negative pole copper bar of power output end.
In the output filter circuit of above-mentioned high-power low-voltage, high-current high frequency switch power device, every electric capacity row's M electrochemical capacitor is evenly intervally arranged into the capable m row of n, n × m=M, n >=2, m >=1.
In the output filter circuit of above-mentioned high-power low-voltage, high-current high frequency switch power device, inductance (L) consists of through multiple ferrocart core magnet rings described anodal copper bar.
Compared with prior art tool of the present invention has the following advantages: the present invention is different from existing single-stage LC filter circuit, and original circuit is the large electric capacity of one or more parallel connections, the capacitance group that the present invention adopts multiple little electrochemical capacitors to form.Due to capacitance group C
zby N piece electric capacity row (C
p1) ..., (C
pN) form, every electric capacity row's structure is identical, and every block of electric capacity row all comprises M electrochemical capacitor, each electrochemical capacitor is all independently drawn wire and is connected to the positive and negative electrode copper bar of power output end, makes capacitance group have the individual independently electrochemical capacitor of N × M and is directly connected with positive and negative electrode copper bar.The total current of capacitive branch in the individual independently electrochemical capacitor shunting of this N × M filter circuit, the electric current that each electrochemical capacitor is born is very little, thereby greatly reduce the ripple producing while flowing through the stray inductance in electrochemical capacitor branch road because of electric current, reach good filter effect.And in output filter circuit of the present invention, use more than two electric capacity row's structure than the good heat dissipation effect of only using one or more large electric capacity.The present invention is especially suitable for use as the industrial power devices such as electrolysis, plating, or the output filter circuit of the high-power high-frequency switch power supply of other low-voltage, high-current output.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of existing single-stage LC output filter circuit.
Fig. 2 is the structured flowchart of the output filter circuit of high-power low-voltage, high-current high frequency switch power device in the specific embodiment of the invention.
Fig. 3 is the electric capacity row structure chart of the output filter circuit of high-power low-voltage, high-current high frequency switch power device in the specific embodiment of the invention.
Fig. 4 is the output voltage waveforms of output voltage ripple, capacitive branch total current waveform and the output rectifier bridge of the output filter circuit of the high-power low-voltage, high-current high frequency switch power of the present invention shown in Fig. 2 device.
Fig. 5 is the output voltage waveforms of output voltage ripple, capacitive branch total current waveform and the output rectifier bridge of the existing output filter circuit shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention is further described, but enforcement of the present invention is not limited to this.
Referring to figs. 2 and 3, the output filter circuit of high-power low-voltage, high-current high frequency switch power device of the present invention is by filter inductance L202 and capacitance group C
z form.Inductance L 202 consists of through multiple ferrocart core magnet rings anodal copper bar 203.Capacitance group C
zby N piece electric capacity row 201(C
p1) ..., (C
pN) composition, every block of electric capacity row 201 structure is identical, by a pcb board 303, a M electrochemical capacitor 301, anodally connect copper sheet 304, negative pole connects copper sheet 305, and connection electrochemical capacitor is connected copper sheet wire group 302 with positive and negative electrode forms.The cathode output end of each electrochemical capacitor 301 that every block of electric capacity row is 201 li is directly connected to the anodal copper sheet 304 that connects by one group of wire 302, and the cathode output end of each electrochemical capacitor 301 is directly connected to negative pole by one group of wire 302 and connects copper sheet 305; The positive and negative electrode output that connects each electrochemical capacitor 301 is independently with the anodal one group of wire 302 that is connected copper sheet 304, negative pole connection copper sheet 305, and every group of wire 302 can be combined by an enamelled wire or many enamelled wires; Many enamelled wires of every group of wire 302, except the plus or minus utmost point output of electrochemical capacitor 301, the anodal place that connects copper sheet 304 or negative pole connection copper sheet 305 link together, are insulated from each other in other position.The positive pole that every block of electric capacity row is 201 li connects copper sheet 304 and is screwed the anodal copper bar 203 of power output end, and negative pole connects copper sheet 305 and be screwed the negative pole copper bar 204 of power output end.Every electric capacity row 201 comprises M electrochemical capacitor 301, capacitance group (C
z) total (N × M) individual independently electrochemical capacitor 301 is connected with anodal copper bar 203, the negative pole copper bar 204 of power output end.Every electric capacity row's 201 M electrochemical capacitor 301 is evenly intervally arranged into the capable m row of n, M=n × m.
In filter circuit of the present invention, establish connection electrochemical capacitor 301 and formed by r bar enamelled wire with the anodal wire group 302 that is connected copper sheet 304, negative pole connection copper sheet 305, for the capacitance group (C that comprises M independent electrochemical capacitor 301
z) always total (N × M × r) bar separate conductors, if the stray inductance of every wire is L
c, establishing the pulse current amplitude that flows through capacitance group is △ I, the voltage magnitude producing in wire group is
Wherein △ t is the rising and falling time of pulse current.From above formula, when r is larger, the voltage magnitude producing in wire group 302 is less, and therefore output voltage and current ripples are also less.
Fig. 4 is the simulation waveform of output filter circuit of the present invention, in artificial circuit, capacitance group is comprised of three identical electric capacity rows, every electric capacity row has 18 electrochemical capacitors, and each electrochemical capacitor amount is 1mF, and capacitance group total capacitance is 54mF, the stray inductance of capacitive branch is 160nH, filter inductance is 800nH, and the output rectifier output amplitude of power supply is 24V, the potential pulse that frequency is 17KHz, the stray inductance of output lead is 400nH, and load is 7m Ω.
Fig. 5 is the simulation waveform of the existing output filter circuit shown in Fig. 1, in artificial circuit, adopt two large electrochemical capacitor parallel connections, each electrochemical capacitor amount is 35mF, capacitance group total capacitance is 60mF, and the stray inductance of capacitive branch is 160nH, and filter inductance is 800nH, the output rectifier output amplitude of power supply is 24V, frequency is the potential pulse of 17KHz, and the stray inductance of output lead is 400nH, and load is 7m Ω.
Comparison diagram 4 and Fig. 5 are known, and the capacitance that the capacitance of output filter circuit of the present invention is used than Fig. 1 circuit is little, but output voltage ripple is approximately 0.086V, is about 1/22 times of Fig. 1 circuit voltage ripple.Filter effect by the known output filter circuit of the present invention of simulation analysis is very good.
Output filter circuit of the present invention is by the electric current of multiple independently little electrochemical capacitor shunting capacitance branch roads, thereby the voltage ripple that the stray inductance that greatly reduces capacitive branch produces, is reduced the high frequency ripple of low-voltage, high-current DC power supply output greatly.The invention solves filter capacitor and lead-in wire stray inductance causes the excessive problem of output voltage ripple, make the output ripple of low-voltage, high-current high-power high-frequency switch power supply meet 1% requirement.And in output filter circuit of the present invention, the structure of using multiple electric capacity row is less than only using the good heat dissipation effect of a large electric capacity or multiple large Capacitance parallel connections, volume.The present invention is especially suitable for use as the industrial power devices such as electrolysis, plating, or other needs the output filter circuit of the high-power high-frequency switch power supply of low-voltage, high-current output.
Claims (2)
1. the output filter circuit of high-power low-voltage, high-current high frequency switch power device, comprises inductance (L), capacitance group (C
z), anodal copper bar and negative pole copper bar; It is characterized in that: described capacitance group (C
z) by N piece electric capacity row, formed, every electric capacity row's structure is identical, and every electric capacity row all comprises M electrochemical capacitor, N>=1, M>=2; Each electrochemical capacitor is independently connected to anodal copper bar or negative pole copper bar by one group of wire separately; Every electric capacity package is drawn together a pcb board, a M electrochemical capacitor, the anodal copper sheet that connects and is connected copper sheet with negative pole, multiple electrochemical capacitors are arranged on pcb board, the anodal copper sheet that connects is connected with anodal copper bar, negative pole connects copper sheet and is connected with negative pole copper bar, the cathode output end of the each electrochemical capacitor in every electric capacity row is directly connected to the anodal copper sheet that connects by one group of wire, and the cathode output end of each electrochemical capacitor is directly connected to negative pole by one group of wire and connects copper sheet; The positive and negative electrode output that connects each electrochemical capacitor is connected copper sheet one group of wire with positive and negative electrode is independently, and every group of wire combined by an enamelled wire or many enamelled wires; Every group of wire comprises many enamelled wires, and many enamelled wires of every group of wire, except connecting at the plus or minus utmost point output of electrochemical capacitor, the plus or minus utmost point the place of copper sheet links together, are insulated from each other in other position; Positive pole connection copper sheet in every electric capacity row is screwed the anodal copper bar of power output end, and negative pole connection copper sheet is screwed the negative pole copper bar of power output end; Every electric capacity row's M electrochemical capacitor is evenly intervally arranged into the capable m row of n, n × m=M, n>=2, m>=1; Inductance (L) consists of through multiple ferrocart core magnet rings described anodal copper bar.
2. the output filter circuit of high-power low-voltage, high-current high frequency switch power device according to claim 1, is characterized in that: N >=2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110273689.1A CN102324836B (en) | 2011-09-16 | 2011-09-16 | Output filtering circuit of high-power low-voltage large-current high-frequency switch power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110273689.1A CN102324836B (en) | 2011-09-16 | 2011-09-16 | Output filtering circuit of high-power low-voltage large-current high-frequency switch power supply device |
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| CN102324836A CN102324836A (en) | 2012-01-18 |
| CN102324836B true CN102324836B (en) | 2014-05-07 |
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| CN201110273689.1A Expired - Fee Related CN102324836B (en) | 2011-09-16 | 2011-09-16 | Output filtering circuit of high-power low-voltage large-current high-frequency switch power supply device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103887957B (en) * | 2014-03-04 | 2016-03-02 | 东莞市脉拓表面处理科技有限公司 | A kind of device that can reduce high-frequency rectification power-supply ripple coefficient |
| CN103986317A (en) * | 2014-05-29 | 2014-08-13 | 深圳市英可瑞科技开发有限公司 | Filter circuit with power frequency output |
| CN107819396A (en) * | 2016-09-14 | 2018-03-20 | 方惠娥 | A kind of comprehensive forceful electric power isolation and electric source filter circuit |
| CN106230290A (en) * | 2016-09-29 | 2016-12-14 | 湖北三江航天万峰科技发展有限公司 | A kind of switching noise restraining device of high-power boosted switch power supply |
| CN112701878B (en) * | 2020-12-08 | 2022-07-08 | 日立电梯（中国）有限公司 | Bus capacitor structure and elevator frequency converter |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200969285Y (en) * | 2006-08-25 | 2007-10-31 | 华为技术有限公司 | Parallel capacitors and its printed circuit boards |
| CN201303286Y (en) * | 2008-06-04 | 2009-09-02 | 张涛 | DC bus structure of frequency converter main circuit |
| CN101692580A (en) * | 2009-09-29 | 2010-04-07 | 杭州浙大太阳电气有限公司 | Novel energy feedback device adopting high frequency switch mode |
| CN202218155U (en) * | 2011-09-16 | 2012-05-09 | 华南理工大学 | Output filter circuit for high-power low-voltage large-current high-frequency switch power supply device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100570963C (en) * | 2007-11-09 | 2009-12-16 | 上海新时达电气股份有限公司 | The fixed connection structure of frequency changer direct current bus |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200969285Y (en) * | 2006-08-25 | 2007-10-31 | 华为技术有限公司 | Parallel capacitors and its printed circuit boards |
| CN201303286Y (en) * | 2008-06-04 | 2009-09-02 | 张涛 | DC bus structure of frequency converter main circuit |
| CN101692580A (en) * | 2009-09-29 | 2010-04-07 | 杭州浙大太阳电气有限公司 | Novel energy feedback device adopting high frequency switch mode |
| CN202218155U (en) * | 2011-09-16 | 2012-05-09 | 华南理工大学 | Output filter circuit for high-power low-voltage large-current high-frequency switch power supply device |
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