CN203151368U - Sampling site circuit of power-factor correction circuit - Google Patents
Sampling site circuit of power-factor correction circuit Download PDFInfo
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- CN203151368U CN203151368U CN2012206516316U CN201220651631U CN203151368U CN 203151368 U CN203151368 U CN 203151368U CN 2012206516316 U CN2012206516316 U CN 2012206516316U CN 201220651631 U CN201220651631 U CN 201220651631U CN 203151368 U CN203151368 U CN 203151368U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The utility model discloses a sampling site circuit of a three-phase busbar and neutral-line-free power-factor correction circuit. The sampling site circuit of the three-phase busbar and neutral-line-free power-factor correction circuit comprises two serial busbar capacitors and a busbar voltage measuring network, a filter network is added between a midpoint of the two serial busbar capacitors and a midpoint of the busbar voltage measuring network, the filter network is a band-pass filter network, a voltage balancing network is further added between the midpoint of the two serial busbar capacitors and the midpoint of the busbar voltage measuring network, the voltage balancing network solves the capacitor voltage unbalance and sampled signal interference problems, and besides, the voltage balancing network is further applicable to various three-phase busbar and neutral-line-free power-factor correction circuits. The filter network can be a different filter network, can be used independently, and also can be used in combination with the voltage balancing network.
Description
Technical field
The utility model relates to a kind of circuit of power factor correction, specifically is the sampling site partial circuit that three-phase bus does not have the circuit of power factor correction of center line input.
Background technology
The PFC(power factor of three-phase four-wire system) circuit as shown in Figure 1.Wherein, A, B, C are the three-phase alternating current inputs, the N line is the center line input, L1, L2, L3 are inductance, Q1～Q6 is the switching tube of band inverse parallel diode, D1～D6 is fly-wheel diode, and C1, C2 are the equivalent capacitys on the series connection bus, and the mid point of capacitor C 1, C2 (Midpoint) connects together with the N line.The three-phase alternating current input is through switching tube Q1～Q6, and sustained diode 1～D6 after the conversion process with capacitor C 1, C2, is output as corresponding direct voltage VDC+ and VDC-.Because the mid point (Midpoint) of capacitor C 1, C2 connects together with the N line, is very stable point, so the ground of control circuit just is taken at this electric capacity mid point, adopt simple electric resistance partial pressure just can adopt output voltage V p, Vn and AC-input voltage Va, Vb, Vc.And then calculating voltage Vc1, Vc2 on capacitor C 1, the C2, Vc1 and Vc2 sum are exactly busbar voltage, can be used for carrying out the loop computing.Wherein: Vc1=k1*Vp, Vc2=k2*Vn; And k1, k2 are the voltage ratios of resistance, in Fig. 1, k1=(R1+R2)/R2, k2=-(R3+R4)/R3.During concrete the application, for ease of calculating, the sampling resistor of symmetry is set usually, R1=R4 is just arranged, R2=R3 is so there is k1=-k2.Voltage on capacitor C 1, the C2 must be ratio close (balance of voltage of two usually said electric capacity just), otherwise that higher electric capacity of voltage is easy to damage because of overvoltage.Owing to can get R1+R2=R3+R4 usually, so this resistor voltage divider network can carry out certain balanced action to the voltage on capacitor C 1, the C2 simultaneously, prevents that these two electric capacity from causing damage because of Voltage unbalance.
Because it is cumbersome that the N line of three-phase four-wire system is laid, so generally require the three-phase three-wire system input now, namely there is not the center line input.Remove the circuit of center line as shown in Figure 2, Here it is usually said Vienna converter.In the prior art, adopt in the topological structure of Vienna converter, still according to the way of three-phase four-line system, the ground of control circuit is taken at the mid point (Midpoint) of capacitor C 1, C2.Yet, because electric capacity mid point (Midpoint) has disconnected with the N line, no longer be a stable point.And the electric capacity mid point connects together with switching tube Q2, Q4, Q6, along with the switch motion of switching tube, can produce the high frequency components noise in the electric capacity midpoint.Because control ground (GND) links together with the electric capacity mid point, so these high frequency components noises can (GND) gets on to ground from electric capacity mid point string, thereby can produce and disturb control circuit (mainly being the sampling amplifying circuit) again.If main power circuit and sample circuit are separated farly when designing printed circuit board, then this to influence meeting littler.But along with present power module volume is done more and more forr a short time, it is very near that main power circuit and sample circuit generally all lean on, so this influence is also apparent in view; Experiment finds that sample circuit has been sealed in very big interference signal, to the THD(Total Harmonic Distortion of power module, total harmonic distortion) influence is very big.
Thereby, can adopt mode shown in Figure 3 that three-level PFC circuit is carried out voltage sample.It is with the difference of Fig. 2: separate between the ground (GND) of the mid point of bus capacitor C1, C2 (Midpoint) and control circuit, do not link together, remainder all is identical, the alternating voltage sampling also is to be connected on the ground (GND) by divider resistance, because the resistance of these divider resistances is all very big, so being actually, ground (GND) is in suspension; At this moment, the high frequency components noise of electric capacity midpoint can not seal in control circuit again.Though also there is the high frequency components noise at bus VDC+ and VDC-place, owing to the resistance of the divider resistance that they is connected to ground (GND) is all very big, so its high frequency components noise can not seal in control circuit through sample line yet.But because electric capacity mid point Midpoint is original and resistor voltage divider network mid point (GND) on; generally because R1+R2=R3+R4; divider resistance has automatic balance function to the voltage on C1, the C2 electric capacity; after these 2 disconnections; voltage on C1, the C2 electric capacity be owing to the reasons such as imbalance of line voltage can cause their Voltage unbalances to damage, and needs the centering electrocardio to compress into row and detects and protect.Because electric capacity mid point Midpoint has the high frequency components noise, the mid-point voltage that detects needs again by the mode of carrying out strong filtering in amplifying circuit noise to be filtered in addition.
Summary of the invention
The purpose of this utility model is according to the existing shortcoming of different circuit in the above-mentioned prior art, a kind of sampling site circuit of new circuit of power factor correction is proposed, both solved in the prior art electric capacity mid point (Midpoint) and ground (GND) when interconnecting electric capacity midpoint high frequency components noise cause the negative interference problem with can influencing control circuit, also solve simultaneously in the prior art and cause the capacitance voltage imbalance problem and need testing circuit the electric capacity mid point to be detected the difficult problem of the strong filtering of needs behind the electric capacity mid point (Midpoint) and ground (GND) disconnection.
The technical solution adopted in the utility model is:
Three-phase bus of the present utility model does not have center line input, has two series connection bus capacitors, busbar voltage pressure networks, adds a filter network between the mid point of the mid point of two series connection bus capacitors and busbar voltage pressure network.Solve the High-frequency Interference of bus mid point to the influence on controlling of sampling ground.
Filter network described in the utility model is the bandpass filtering network.Solve the High-frequency Interference of bus mid point to the influence on controlling of sampling ground.
The utility model also adds a balance of voltage network simultaneously between the mid point of two series connection mid points of bus capacitors and busbar voltage pressure network.Solve the High-frequency Interference of capacitance voltage imbalance and bus mid point to the influence on controlling of sampling ground.
The utility model has the advantages that: the utility model is except solving above-mentioned capacitance voltage imbalance and sampled signal disturbed, and applicable different three-phase does not have center line PFC circuit of power factor correction.Simultaneously, the filter network in the utility model can be different filter network, and they can use separately, also can use with balance of voltage combination of network.
Description of drawings
Fig. 1 is that three-phase bus has center line input and the mid point of two series connection bus capacitors and the circuit of power factor correction that center line connects together;
Fig. 2 is that three-phase bus does not have center line input and two connect bus capacitor mid points and the circuit of power factor correction that link together with controlling;
Fig. 3 is that three-phase bus does not have center line input and two series connection bus capacitor mid points and controls the circuit of power factor correction that ground disconnects;
Fig. 4 is the circuit structure diagram of the utility model embodiment 1;
Fig. 5 is the circuit structure diagram of the utility model embodiment 2;
Fig. 6 is the circuit structure diagram of the utility model embodiment 3;
Fig. 7 is the circuit structure diagram of the utility model embodiment 4;
Fig. 8 is one of the present utility model and uses illustration.
Provide 4 embodiment to elaborate the technical solution of the utility model below in conjunction with accompanying drawing;
Embodiment 1
Referring to Fig. 4, between two series connection bus capacitor C1, C2 mid point and busbar voltage pressure network mid points, add a balance of voltage network and a two-way tape pass filter network, this balance of voltage network is made up of resistance R 6 and resistance R 7, and this two-way tape pass filter network is made up of capacitor C 3, C4, C5 and R5, R1+R2, R3+R4.In order to play balance of voltage effect, usually get R6=R7, theoretically, when R6 and R7 value were got enough hour, can make the voltage complete equipilibrium of C1 and C2, but R6 and R7 value are got and will inevitably be brought high loss and big electric current in enough hour, therefore, need take all factors into consideration when choosing R6 and R7 resistance, can reach the function of balancing capacitance voltage to a certain extent, the loss that causes simultaneously also can meet the demands, different input voltage ranges and different requirement, its choosing value is also different, is generally several kilohms to the scope of hundreds of kilohm.Simultaneously, the adding of balance of voltage network, may make C1, C2 mid-point voltage more stable, also can be more stable by the sampling ground (GND) that forms with the mid point of voltage sampling R1, R2, R3, R4 behind the filter network of back, reduce because of C1, the fluctuation of C2 mid point to controlling of sampling the negative effect that brings.The two-way tape pass filter network that capacitor C 3, C4, C5 and R5, R1+R2, R3+R4 form can filter nearby to the high frequency components that switching tube produces, can the input ac voltage triple-frequency harmonics that the electric capacity mid point is introduced be filtered simultaneously, so just need not ac voltage signal Va, Vb, the Vc that adopt be handled, the voltage of adopting is exactly sinusoidal voltage.C3, C4 and R5, R1+R2 can split R1, the R2 sampling microwave network carries out filtering, and C3, C5 and R5, R3+R4 can carry out filtering to R3, R4 sampling microwave network.Individual in addition, two-way low-pass filter network is placed between C1, C2 and sample resistance network R1, R2, R3, the R4, here, sample resistance (R1+R2) with (R3+R4) replaced needed two resistance of original band pass filter, they have played filtering and sampling dual-use function, and the needs that their resistance can combination band pass filter bandwidth design.The bandwidth of this band pass filter is chosen between input third harmonic frequencies and the PFC switching frequency, as being that 50HZ and PFC switching frequency are when being 50KHZ when input three-phase frequency, the logical scope of the band of band pass filter can be designed between 1KHz ~ 30KHZ, the design that the specific design of each parameter can reference bandpass filter in the band pass filter here is not specifically addressed.
This circuit can prevent that High-frequency Interference is delivered to other link by sample line, influences the sampling of EMC and other signal simultaneously.By the star ground (GND) of input voltage sample circuit formation and being connected of busbar voltage sampling mid point ground (GND) of circuit prime, just formed whole PFC sampling site like this.The sampling that can carry out each phase input voltage of PFC, electric current, busbar voltage and capacitor C 1, C2 mid-point voltage Vdalta etc. with controlled.
In the present embodiment, can obtain Vp and Vn by the electric resistance partial pressure sampling equally, and then calculate voltage summation on resistance R 1, R2, R3, the R4, and this voltage summation equates with voltage Vc1, the Vc2 sum (busbar voltage just) of capacitor C 1, C2, so can calculate busbar voltage by following formula:
Vc1+Vc2=k1*Vp+k2*Vn。
In the present embodiment, also the voltage difference between electric capacity mid point (Midpoint) and the ground (GND) is sampled, to obtain voltage difference Vdelta between the two, can calculate Vc1 and Vc2 accordingly, wherein:
Vc1=k1*Vp-Vdelta，
Vc2=k2*Vn-Vdelta，
Can draw the voltage difference on capacitor C 1, the C2 accordingly:
Vc1-?Vc2=（k1*Vp-Vdelta）-（k2*Vn-Vdelta）
=?k1*Vp-?k2*Vn-2*?Vdelta
Wherein, k1=(R1+R2)/R2, k2=-(R3+R4)/R3.During concrete the application, for ease of calculating, corresponding sampling resistor is set usually, R1=R4 is just arranged, R2=R3, so k1=-k2 is arranged, have this moment:
Vc1+Vc2=k1*（Vp-Vn）；
Vc1-Vc2=?k1*（Vp+Vn）-2*?Vdelta。
Embodiment 2
Filter network among Fig. 4 can substitute with different filter circuits, selects for use flexibly according to situation about disturbing, as adopting a kind of simple and easy RC(C3 and R5 among Fig. 5) filter network replaces the two-way tape pass filter network among Fig. 4.Between two series connection bus capacitor C1, C2 mid point and busbar voltage pressure network mid points, add a simple and easy RC filter network that is composed in series by C3 and R5, and add a balancing network of being formed by R6, R7.
Fig. 6 adopts a kind ofly to have only the bandpass filtering network to replace band balancing network among Fig. 4 that the method for two-way tape pass filter network is arranged again simultaneously.Between two series connection bus capacitor C1, C2 mid point and busbar voltage pressure network mid points, add a resistance R 5 by series connection, capacitor C 3 and capacitor C 4 in parallel, the bandpass filtering network that C5 forms.
Embodiment 4
Fig. 7 adopts simple and easy filter network to produce a kind of circuit of power factor correction sampling separately to handle with control ground.Between two series connection bus capacitor C1, C2 mid point and busbar voltage pressure network mid points, add a simple and easy filter network that is composed in series by resistance R 5 and capacitor C 3.
The whole bag of tricks that the utility model is taked and distortion thereof are suitable for the processing that various three-phase does not have center line controlling of sampling ground, are exactly a kind of concrete application as shown in Figure 8.
Claims (5)
1. the sampling site circuit of a circuit of power factor correction, three-phase bus does not have the center line input, have two series connection bus capacitors, busbar voltage pressure networks, it is characterized in that: between the mid point of the mid point of two series connection bus capacitors and busbar voltage pressure network, add a filter network.
2. the sampling site circuit of circuit of power factor correction according to claim 1, it is characterized in that: described filter network is the bandpass filtering network.
3. the sampling site circuit of arbitrary circuit of power factor correction according to claim 1 and 2 is characterized in that: also add a balance of voltage network simultaneously between the mid point of the mid point of two series connection bus capacitors and busbar voltage pressure network.
4. the sampling site circuit of circuit of power factor correction according to claim 3, it is characterized in that: described balance of voltage network is made up of the resistance of two identical resistances.
5. the sampling site circuit of circuit of power factor correction according to claim 1, it is characterized in that: described filter network is the RC filter network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206516316U CN203151368U (en) | 2012-12-03 | 2012-12-03 | Sampling site circuit of power-factor correction circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206516316U CN203151368U (en) | 2012-12-03 | 2012-12-03 | Sampling site circuit of power-factor correction circuit |
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| CN203151368U true CN203151368U (en) | 2013-08-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012206516316U Expired - Fee Related CN203151368U (en) | 2012-12-03 | 2012-12-03 | Sampling site circuit of power-factor correction circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107692A (en) * | 2012-12-03 | 2013-05-15 | 江苏嘉钰新能源技术有限公司 | Sampling site circuit of power-factor correction circuit |
| CN105940599A (en) * | 2014-03-03 | 2016-09-14 | 欧姆龙株式会社 | Power conversion device and control device |
| CN106712543A (en) * | 2016-12-13 | 2017-05-24 | 成都麦隆电气有限公司 | VIENNA rectifier using low-voltage-withstanding booster diode |
-
2012
- 2012-12-03 CN CN2012206516316U patent/CN203151368U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107692A (en) * | 2012-12-03 | 2013-05-15 | 江苏嘉钰新能源技术有限公司 | Sampling site circuit of power-factor correction circuit |
| CN105940599A (en) * | 2014-03-03 | 2016-09-14 | 欧姆龙株式会社 | Power conversion device and control device |
| US10033266B2 (en) | 2014-03-03 | 2018-07-24 | Omron Corporation | Power conversion device and control device |
| CN106712543A (en) * | 2016-12-13 | 2017-05-24 | 成都麦隆电气有限公司 | VIENNA rectifier using low-voltage-withstanding booster diode |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20161203 |