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CN202218155U - Output filter circuit of high-power low-voltage high-current high-frequency switching power supply device - Google Patents

Output filter circuit of high-power low-voltage high-current high-frequency switching power supply device Download PDF

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Publication number
CN202218155U
CN202218155U CN2011203461798U CN201120346179U CN202218155U CN 202218155 U CN202218155 U CN 202218155U CN 2011203461798 U CN2011203461798 U CN 2011203461798U CN 201120346179 U CN201120346179 U CN 201120346179U CN 202218155 U CN202218155 U CN 202218155U
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China
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capacitor
filter circuit
power supply
current
positive
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CN2011203461798U
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张波
肖文勋
张桂东
段振涛
何文志
戴钰
林仕立
丘东元
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South China University of Technology SCUT
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South China University of Technology SCUT
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Abstract

The utility model provides an output filter circuit for a high-power low-voltage large-current high-frequency switch power supply device, comprising an inductor, a capacitor bank, an anode copper bar and a cathode copper bar; the capacitor bank (CZ) consists of N capacitor bars, the structure of each capacitor bar is the same as one another, and each capacitor row comprises M electrolytic capacitors, wherein N is more than or equal to 1, and M is more than or equal to 2; and each electrolytic capacitor is independently connected with the anode copper bar or the cathode copper bar by a set of conductive wires. The gross current of a capacitor branch in the filter circuit is branched by the multiple electrolytic capacitors, so that the ripple wave generated when the current passes through a parasitic inductance in each electrolytic capacitor branch can be greatly reduced, and a better wave filtering effect can be achieved; and compared with the structure which only uses a large capacitor or uses a plurality of large capacitors which are connected with one another in parallel, the structure which uses the plurality of capacitor bars is good in heat dissipation effect and small in volume. The output filter circuit is applicable to an industrial power supply device for electrolysis, electrofacing and the like, or the other output filter circuits which need high-power high-frequency switch power supply of low-voltage large-current output.

Description

The output filter circuit of high-power low-voltage, high-current high frequency switch power device
Technical field
The utility model relates to the output technical field of filtering of the high-power high-frequency switch power supply of low-voltage and high-current output, is specifically related to a kind of output filter circuit that is applicable to the high-power low-voltage, high-current high frequency switch power device of industrial circles such as electrolysis, plating.
Background technology
The application of high frequency switch power in commercial production more and more widely, for example as the core of electrochemical industry power supplys such as electrolysis, plating equipments, high frequency switch power generally need be exported 6 ~ 30V, the direct current that 1000A is above.And in order to improve processing quality, the ripple of output voltage and electric current is low more good more, even some occasions requires the ripple of voltage and current to be lower than 1%, and this design to the power supply output filter circuit is a great difficult problem.
At present the direct current high frequency switch power extensively adopts single-stage or multistage LC filter circuit in output filtering link, i.e. main circuit crosstalk sense, and several big electric capacity come the filtering high frequency ripple.Because the electric current of power supply output is very big, filter inductance generally passes magnet ring by copper bar and constitutes, and this moment, copper bar was 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 through and a plurality of magnet rings improve inductance value, but because the space of supply unit is limited, magnet ring that can parallel connection is limited, therefore total inductance value is smaller.Simultaneously; There are stray inductance in line, output lead between filter capacitor, filter capacitor and the output busbar; Relative filter inductance, the value of these stray inductances is considerable, when this makes the big electric current of high-frequency impulse through the LC filter; On the stray inductance of line between filter capacitor and filter capacitor and the output busbar, produce bigger voltage ripple, make that the voltage and current ripple of power supply output is very big.
The utility model content
The purpose of the utility model is to overcome the deficiency of above-mentioned prior art, and a kind of output filter circuit that is applicable to the high-power low-voltage, high-current high frequency switch power device of industrial circles such as electrolysis, plating is provided.The principle of the filter circuit of the utility model is the electric current that flows through the filter capacitor branch road through a large amount of reductions, with the voltage that reduces to be produced by the stray inductance of filter capacitor branch road, thereby reduces the ripple of electric power output voltage and electric current greatly, and specifically technical scheme is following.
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; Said capacitance group C ZRow forms by N piece electric capacity, 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 independently is connected to anodal copper bar or negative pole copper bar through one group of lead 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; A plurality of electrochemical capacitors are installed on the pcb board; The anodal copper sheet that connects is connected with anodal copper bar; Negative pole connects copper sheet and is connected with the negative pole copper bar, and the cathode output end of each electrochemical capacitor in every block of electric capacity is arranged is directly connected to the anodal copper sheet that connects through one group of lead, and the cathode output end of each electrochemical capacitor is directly connected to negative pole through one group of lead and connects copper sheet; The positive and negative electrode output that connects each electrochemical capacitor is connected copper sheet with positive and negative electrode one group of lead is independently, and said every group of lead combined by an enamelled wire or many enamelled wires; Every group of lead comprises many enamelled wires, and many enamelled wires of every group of lead are insulated from each other in other position except the Local Force Company that connects copper sheet at the plus or minus utmost point output of electrochemical capacitor, the plus or minus utmost point is connected together.
In the output filter circuit of above-mentioned high-power low-voltage, high-current high frequency switch power device; Positive pole in every block of electric capacity row connects copper sheet and is fixed to the anodal copper bar of power output end through screw, and negative pole connects copper sheet is fixed to power output end through screw negative pole copper bar.
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 evenly is 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) passes a plurality of ferrocart core magnet rings by said anodal copper bar and constitutes.
Compared with prior art the utlity model has following advantage: the utility model is different from existing single-stage LC filter circuit, and original circuit is the big electric capacity of one or more parallel connections, the capacitance group that the utility model adopts a plurality of little electrochemical capacitors to constitute.Because capacitance group C ZBy N piece electric capacity row (C P1) ..., (C PN) constitute; Every electric capacity row's structure is identical; And every electric capacity row all comprises M electrochemical capacitor, and each electrochemical capacitor is all independently drawn the positive and negative electrode copper bar that lead is connected to power output end, makes capacitance group have the individual independently electrochemical capacitor of N * M and directly is connected with the 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 reduce greatly because the ripple that electric current produces when flowing through the stray inductance in the electrochemical capacitor branch road reaches filter effect preferably.And in the output filter circuit of the utility model, the structure of using two above electric capacity rows is than the good heat dissipation effect of only using one or more big electric capacity.The utility model is especially suitable for use as industrial power devices such as electrolysis, plating, perhaps the output filter circuit of the high-power high-frequency switch power supply of other low-voltage, high-current output.
Description of drawings
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 utility model embodiment.
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 utility model embodiment.
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 utility model shown in Figure 2 device.
Fig. 5 is the output voltage waveforms of output voltage ripple, capacitive branch total current waveform and the output rectifier bridge of existing output filter circuit shown in Figure 1.
Embodiment
Further describe below in conjunction with the practical implementation of accompanying drawing, but the enforcement of the utility model is not limited thereto the utility model.
Referring to figs. 2 and 3, the output filter circuit of the described high-power low-voltage, high-current high frequency switch power device of the utility model is by filter inductance L202 and capacitance group C ZConstitute.Inductance L 202 is passed a plurality of ferrocart core magnet rings by anodal copper bar 203 and is constituted.Capacitance group C ZBy N piece electric capacity row 201 (C P1) ..., (C PN) form, every electric capacity row's 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 connects electrochemical capacitor is connected copper sheet with positive and negative electrode lead group 302 formations.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 through one group of lead 302, and the cathode output end of each electrochemical capacitor 301 is directly connected to negative pole through one group of lead 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 lead 302 that is connected copper sheet 304, negative pole connection copper sheet 305, and every group of lead 302 can be combined by an enamelled wire or many enamelled wires; Many enamelled wires of every group of lead 302 are insulated from each other except the plus or minus utmost point output of electrochemical capacitor 301, the anodal Local Force Company that connects copper sheet 304 or negative pole connection copper sheet 305 are connected together in other position.The positive pole that every block of electric capacity row is 201 li connects copper sheet 304 and is fixed to the anodal copper bar 203 of power output end through screw, and negative pole connects copper sheet 305 is fixed to power output end through screw negative pole copper bar 204.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 evenly is intervally arranged into the capable m row of n, M=n * m.
In the said filter circuit of the utility model, establish connection electrochemical capacitor 301 and form by r bar enamelled wire, then for the capacitance group (C that comprises M independent electrochemical capacitor 301 with the anodal lead group 302 that is connected copper sheet 304, negative pole connection copper sheet 305 Z) total total (the bar separate conductors of N * M * r) is if the stray inductance of every lead is L C, establishing the pulse current amplitude that flows through capacitance group is △ I, the voltage magnitude that then on the lead group, produces does
(1)
Wherein △ t is the rising and the fall time of pulse current.Can know that by following formula when r was big more, the voltage magnitude that on lead group 302, produces was more little, so output voltage and current ripples are also more little.
Fig. 4 is the simulation waveform of the utility model output filter circuit, and capacitance group is made up of three identical electric capacity rows in the artificial circuit, and every electric capacity row has 18 electrochemical capacitors; Each electrochemical capacitor amount is 1mF, and the capacitance group total capacitance is 54mF, and the stray inductance of capacitive branch is 160nH; Filter inductance is 800nH, and the output rectifier output amplitude of power supply is 24V, and frequency is the potential pulse of 17KHz; The stray inductance of output lead is 400nH, and load is 7m Ω.
Fig. 5 is the simulation waveform of existing output filter circuit shown in Figure 1, adopts two big electrochemical capacitors parallel connections in the artificial circuit, and each electrochemical capacitor amount is 35mF; The 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 can know that with Fig. 5 the capacitance of the output filter circuit of the utility model is littler than the capacitance that Fig. 1 circuit uses, but output voltage ripple is approximately 0.086V, is about 1/22 times of Fig. 1 circuit voltage ripple.But the filter effect by the output filter circuit of simulation analysis knowledge capital utility model is very good.
The output filter circuit of the utility model is through the electric current of a plurality of independently little electrochemical capacitor shunting capacitance branch roads; Thereby the voltage ripple that the stray inductance that reduces capacitive branch greatly produces makes that the high frequency ripple of low-voltage, high-current DC power supply output is reduced greatly.The utility model has solved filter capacitor and the lead-in wire stray inductance causes the excessive problem of output voltage ripple, makes the output ripple of low-voltage, high-current high-power high-frequency switch power supply satisfy 1% requirement.And in the output filter circuit of the utility model, use a plurality of electric capacity rows' structure littler than the good heat dissipation effect, the volume that only use a big electric capacity or a plurality of big electric capacity parallel connections.The utility model is especially suitable for use as industrial power devices such as electrolysis, plating, and perhaps other needs the output filter circuit of the high-power high-frequency switch power supply of low-voltage, high-current output.

Claims (6)

1.大功率低压大电流高频开关电源装置的输出滤波电路，包括电感（L）、电容组（CZ）、正极铜排和负极铜排；其特征在于：所述电容组（CZ）由N块电容排组成，每块电容排的结构相同，每块电容排均包含M个电解电容，N≥1，M≥2；每个电解电容各自独立的通过一组导线连接至正极铜排或负极铜排。 1. The output filter circuit of a high-power low-voltage, high-current, high-frequency switching power supply device, including an inductor (L), a capacitor group (C Z ), a positive copper bar and a negative copper bar; it is characterized in that: the capacitor bank (C Z ) It consists of N capacitor banks, each capacitor bank has the same structure, and each capacitor bank contains M electrolytic capacitors, N≥1, M≥2; each electrolytic capacitor is independently connected to the positive copper bar through a set of wires Or negative copper row. 2.根据权利要求1所述的大功率低压大电流高频开关电源装置的输出滤波电路，其特征在于每块电容排包括一块PCB板、M个电解电容、正极连接铜片和负极连接铜片，多个电解电容安装在PCB板上，正极连接铜片与正极铜排连接，负极连接铜片与负极铜排连接，每块电容排里的每个电解电容的正极输出端通过一组导线直接连接到正极连接铜片，每个电解电容的负极输出端通过一组导线直接连接到负极连接铜片；连接每个电解电容的正、负极输出端与正、负极连接铜片的一组导线是独立的，所述每组导线由一根漆包线或多根漆包线组合而成；每组导线包括多根漆包线，每组导线的多根漆包线除了在电解电容的正或负极输出端、正或负极连接铜片的地方连接在一起外，在其它位置是彼此绝缘的。 2. The output filter circuit of high-power low-voltage high-current high-frequency switching power supply device according to claim 1, it is characterized in that each capacitor row comprises a PCB board, M electrolytic capacitors, positive pole connection copper sheet and negative pole connection copper sheet , multiple electrolytic capacitors are installed on the PCB board, the positive connection copper sheet is connected to the positive electrode copper bar, the negative electrode connection copper sheet is connected to the negative electrode copper bar, and the positive output terminal of each electrolytic capacitor in each capacitor row is directly connected through a set of wires. Connected to the positive connection copper sheet, the negative output terminal of each electrolytic capacitor is directly connected to the negative connection copper sheet through a set of wires; a set of wires connecting the positive and negative output terminals of each electrolytic capacitor to the positive and negative connection copper sheets is Independently, each group of wires is composed of one enameled wire or a combination of multiple enameled wires; each group of wires includes multiple enameled wires, and the multiple enameled wires of each group of wires are connected to the positive or negative output terminal of the electrolytic capacitor or the positive or negative pole. The places where the copper sheets are connected together are insulated from each other in other places. 3.根据权利要求2所述的大功率低压大电流高频开关电源装置的输出滤波电路，其特征在于：每块电容排里的正极连接铜片通过螺丝固定到电源输出端的正极铜排，负极连接铜片通过螺丝固定到电源输出端的负极铜排。 3. The output filter circuit of high-power, low-voltage, high-current, high-frequency switching power supply device according to claim 2, characterized in that: the positive electrode connection copper sheet in each capacitor row is fixed to the positive electrode copper row of the power supply output terminal by screws, and the negative electrode The connecting copper sheet is fixed to the negative copper bar at the output end of the power supply through screws. 4.根据权利要求3所述的大功率低压大电流高频开关电源装置的输出滤波电路，其特征在于：每块电容排的M个电解电容均匀间隔排布成n行m列， n×m=M，n≥2，m≥1 。 4. The output filter circuit of the high-power low-voltage high-current high-frequency switching power supply device according to claim 3, characterized in that: the M electrolytic capacitors of each capacitor row are evenly spaced and arranged into n rows and m columns, n × m =M, n≥2, m≥1. 5.根据权利要求1～4任一项所述的大功率低压大电流高频开关电源装置的输出滤波电路，其特征在于：电感（L）由所述正极铜排穿过多个铁粉芯磁环构成。 5. The output filter circuit of a high-power, low-voltage, high-current, high-frequency switching power supply device according to any one of claims 1 to 4, characterized in that: the inductance (L) passes through a plurality of iron powder cores from the positive copper bar The magnetic ring constitutes. 6.根据权利要求1～4任一项所述的大功率低压大电流高频开关电源装置的输出滤波电路，其特征在于：N≥2。 6. The output filter circuit of a high-power, low-voltage, high-current, high-frequency switching power supply device according to any one of claims 1-4, characterized in that: N≥2.
CN2011203461798U 2011-09-16 2011-09-16 Output filter circuit of high-power low-voltage high-current high-frequency switching power supply device Expired - Lifetime CN202218155U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102324836A (en) * 2011-09-16 2012-01-18 华南理工大学 Output filter circuit of high-power low-voltage high-current high-frequency switching power supply device
CN104143926A (en) * 2013-05-09 2014-11-12 福特全球技术公司 Integrated electrical and thermal solution for inverter DC-link capacitor packaging
CN112701878A (en) * 2020-12-08 2021-04-23 日立电梯（中国）有限公司 Bus capacitor structure and elevator frequency converter

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102324836A (en) * 2011-09-16 2012-01-18 华南理工大学 Output filter circuit of high-power low-voltage high-current high-frequency switching power supply device
CN102324836B (en) * 2011-09-16 2014-05-07 华南理工大学 Output filtering circuit of high-power low-voltage large-current high-frequency switch power supply device
CN104143926A (en) * 2013-05-09 2014-11-12 福特全球技术公司 Integrated electrical and thermal solution for inverter DC-link capacitor packaging
CN104143926B (en) * 2013-05-09 2019-09-17 福特全球技术公司 Integrated electrically and thermally solution for inverter DC bus capacitance packaging
CN112701878A (en) * 2020-12-08 2021-04-23 日立电梯（中国）有限公司 Bus capacitor structure and elevator frequency converter
CN112701878B (en) * 2020-12-08 2022-07-08 日立电梯（中国）有限公司 Bus capacitor structure and elevator inverter

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