CN103107692A - Sampling site circuit of power-factor correction circuit - Google Patents
Sampling site circuit of power-factor correction circuit Download PDFInfo
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- CN103107692A CN103107692A CN2012105055139A CN201210505513A CN103107692A CN 103107692 A CN103107692 A CN 103107692A CN 2012105055139 A CN2012105055139 A CN 2012105055139A CN 201210505513 A CN201210505513 A CN 201210505513A CN 103107692 A CN103107692 A CN 103107692A
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- 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
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Abstract
The invention 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 present invention relates to a kind of circuit of power factor correction, specifically three-phase bus is without the sampling site partial circuit of 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 with anti-paralleled diode, D1～D6 is fly-wheel diode, and C1, C2 are the equivalent capacitys on series 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 and N line connect together, be 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, 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, and k1=(R1+R2)/R2, k2=-(R3+R4)/R3.During concrete the application, for ease of calculating, symmetrical sampling resistor is set usually, R1=R4 is namely arranged, R2=R3 is so there is k1=-k2.Voltage on capacitor C 1, C2 must be ratio close (the namely balance of voltage of two usually said electric capacity), otherwise that higher electric capacity of voltage is easy to damage because of overvoltage.Owing to usually can getting R1+R2=R3+R4, so this resistor voltage divider network can carry out certain balanced action to the voltage on capacitor C 1, C2 simultaneously, prevents that these two electric capacity from causing damage because of Voltage unbalance.
Because the N line laying of three-phase four-wire system is cumbersome, so General Requirements three-phase three-wire system input does not now namely have the center line input.Remove the circuit of center line as shown in Figure 2, Here it is usually said Vienna converter.In 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) and N line have disconnected, be no longer 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.Link together with the electric capacity mid point owing to controlling ground (GND) again, so these high frequency components noises can (GND) gets on to ground from electric capacity mid point string, disturb thereby can produce control circuit (being mainly the amplifier circuit).If main power circuit and sample circuit are separated farly when designing printed circuit board, this to affect meeting less.But along with present power module volume is done more and more littlely, it is very near that main power circuit and sample circuit generally all lean on, so this impact is also apparent in view; Experiment finds, sample circuit has been sealed in very large interference signal, to the THD(Total Harmonic Distortion of power module, total harmonic distortion) impact is very large.
Thereby, can adopt mode shown in Figure 3 to carry out voltage sample to three-level PFC circuit.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 is all identical, the alternating voltage sampling is also to be connected on ground (GND) by divider resistance, because the resistance of these divider resistances is all very large, 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.Although also there is the high frequency components noise at bus VDC+ and VDC-place, because the resistance of the divider resistance that they is connected to ground (GND) is all very large, so its high frequency components noise can not seal in control circuit through sample line yet.But due to electric capacity mid point Midpoint on original and resistor voltage divider network mid point (GND); generally due to R1+R2=R3+R4; divider resistance has automatic balance function to the voltage on C1, C2 electric capacity; after these 2 disconnections; voltage on C1, C2 electric capacity needs the centering electrocardio to compress into row and detects and protect because the reasons such as imbalance of line voltage can cause their Voltage unbalances to damage.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 objective of the invention is according to the existing shortcoming of different circuit in above-mentioned prior art, a kind of sampling site circuit of new circuit of power factor correction is proposed, both solved in 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 affecting control circuit, also solve simultaneously in 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 after electric capacity mid point (Midpoint) and ground (GND) disconnection.
The technical solution used in the present invention is:
Three-phase bus of the present invention is inputted without center line, has two series bus electric capacity, busbar voltage pressure network, adds a filter network between the mid point of the mid point of two series bus electric capacity and busbar voltage pressure network.Solve the High-frequency Interference of bus mid point to the impact on controlling of sampling ground.
Filter network of the present invention is the bandpass filtering network.Solve the High-frequency Interference of bus mid point to the impact on controlling of sampling ground.
The present invention also adds a balance of voltage network simultaneously between the mid point of the mid point of two series bus electric capacity and busbar voltage pressure network.Solve the High-frequency Interference of capacitance voltage imbalance and bus mid point to the impact on controlling of sampling ground.
Advantage of the present invention is: the present invention is except solving above-mentioned capacitance voltage imbalance and sampled signal be disturbed, and applicable different three-phase is without center line PFC circuit of power factor correction.Simultaneously, the filter network in the present invention 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 bus electric capacity and the circuit of power factor correction that center line connects together;
Fig. 2 is three-phase bus without center line input and two series bus electric capacity mid points and the circuit of power factor correction that links together with controlling;
Fig. 3 is three-phase bus without center line input and two series bus electric capacity mid points and the circuit of power factor correction of controlling ground and disconnecting;
Fig. 4 is the circuit structure diagram of the embodiment of the present invention 1;
Fig. 5 is the circuit structure diagram of the embodiment of the present invention 2;
Fig. 6 is the circuit structure diagram of the embodiment of the present invention 3;
Fig. 7 is the circuit structure diagram of the embodiment of the present invention 4;
Fig. 8 is one of the present invention and uses illustration.
Provide 4 embodiment to elaborate technical scheme of the present invention below in conjunction with accompanying drawing;
Embodiment 1
Referring to Fig. 4, add a balance of voltage network and a two-way tape pass filter network between two series bus capacitor C 1, C2 mid point and busbar voltage pressure network mid point, this balance of voltage network is comprised of resistance R 6 and resistance R 7, and this two-way tape pass filter network is comprised 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 take fully enough hour, can make the voltage complete equipilibrium of C1 and C2, but R6 and R7 value take fully enough hour will inevitably bring high loss and large electric current, therefore, need to consider when choosing R6 and R7 resistance, can reach to a certain extent the function of balancing capacitance voltage, 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, 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 after 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 processed, 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.Another, two-way low-pass filter network is placed between C1, C2 and sample resistance network R1, R2, R3, 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 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 in band pass filter, the specific design of each parameter can reference bandpass filter here is not specifically addressed.
This circuit can prevent that High-frequency Interference is delivered to other link by sample line, affects the sampling of EMC and other signal simultaneously.By (GND) with star 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.Can carry out the sampling of each phase input voltage of PFC, electric current, busbar voltage and capacitor C 1, C2 mid-point voltage Vdalta etc. and control.
In the present embodiment, can sample by electric resistance partial pressure equally and obtain Vp and Vn, and then calculate voltage summation on resistance R 1, R2, R3, R4, and this voltage summation equates with voltage Vc1, the Vc2 sum (namely busbar voltage) 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 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 accordingly the voltage difference on capacitor C 1, C2:
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 namely arranged, R2=R3, so k1=-k2 is arranged, have this moment:
Vc1+Vc2=k1*（Vp-Vn）；
Vc1-Vc2=?k1*（Vp+Vn）-2*?Vdelta。
Filter network in Fig. 4 can substitute with different filter circuits, selects flexibly according to situation about disturbing, as adopting a kind of simple and easy RC(C3 and R5 in Fig. 5) filter network replaces the two-way tape pass filter network in Fig. 4.Add a simple and easy RC filter network that is composed in series by C3 and R5 between two series bus capacitor C 1, C2 mid point and busbar voltage pressure network mid point, and add a balancing network that is formed by R6, R7.
Embodiment 3
Fig. 6 adopts a kind ofly to only have the bandpass filtering network to replace with balancing network, the method for two-way tape pass filter network being arranged again simultaneously in Fig. 4.Add a resistance R 5 by series connection, capacitor C 3 and capacitor C 4 in parallel, the bandpass filtering network that C5 forms between two series bus capacitor C 1, C2 mid point and busbar voltage pressure network mid point.
Embodiment 4
Fig. 7 adopts separately simple and easy filter network produce a kind of circuit of power factor correction sampling and control ground and process.Add a simple and easy filter network that is composed in series by resistance R 5 and capacitor C 3 between two series bus capacitor C 1, C2 mid point and busbar voltage pressure network mid point.
The applicable various three-phase of the whole bag of tricks that the present invention takes and distortion thereof without the processing on center line controlling of sampling ground, is 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 is inputted without center line, have two series bus electric capacity, busbar voltage pressure network, it is characterized in that: add a filter network between the mid point of the mid point of two series bus electric capacity and busbar voltage pressure 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 simultaneously a balance of voltage network between the mid point of the mid point of two series bus electric capacity 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 comprised 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.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012105055139A CN103107692A (en) | 2012-12-03 | 2012-12-03 | Sampling site circuit of power-factor correction circuit |
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| CN2012105055139A CN103107692A (en) | 2012-12-03 | 2012-12-03 | Sampling site circuit of power-factor correction circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034696A (en) * | 2019-03-27 | 2019-07-19 | 南京航空航天大学 | A kind of current sample method for three-phase tri-level VIENNA rectifier |
| CN112865560A (en) * | 2021-01-28 | 2021-05-28 | 三峡大学 | Multi-diode series back-to-back bridgeless three-level rectifier |
| CN112865561A (en) * | 2021-01-28 | 2021-05-28 | 三峡大学 | Diode clamping type back-to-back bridgeless three-level rectifier |
| CN113437885A (en) * | 2021-06-28 | 2021-09-24 | 三峡大学 | Three-level rectifier based on diode clamping bidirectional switch |
| WO2023137860A1 (en) * | 2022-01-21 | 2023-07-27 | 薛洛良 | Grounding method for three-phase csr high-frequency pwm rectifier circuit |
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| EP0911950A2 (en) * | 1997-10-23 | 1999-04-28 | General Electric Company | High power motor drive converter system and modulation control |
| CN101009432A (en) * | 2006-01-24 | 2007-08-01 | 艾默生网络能源系统有限公司 | Sampling circuit for three-level power factor correction circuit and voltage sampling method thereof |
| CN101242135A (en) * | 2007-02-07 | 2008-08-13 | 艾默生网络能源系统有限公司 | Three-level power factor correction circuit |
| CN203151368U (en) * | 2012-12-03 | 2013-08-21 | 江苏嘉钰新能源技术有限公司 | Sampling site circuit of power-factor correction circuit |
-
2012
- 2012-12-03 CN CN2012105055139A patent/CN103107692A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0911950A2 (en) * | 1997-10-23 | 1999-04-28 | General Electric Company | High power motor drive converter system and modulation control |
| CN101009432A (en) * | 2006-01-24 | 2007-08-01 | 艾默生网络能源系统有限公司 | Sampling circuit for three-level power factor correction circuit and voltage sampling method thereof |
| CN101242135A (en) * | 2007-02-07 | 2008-08-13 | 艾默生网络能源系统有限公司 | Three-level power factor correction circuit |
| CN203151368U (en) * | 2012-12-03 | 2013-08-21 | 江苏嘉钰新能源技术有限公司 | Sampling site circuit of power-factor correction circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110034696A (en) * | 2019-03-27 | 2019-07-19 | 南京航空航天大学 | A kind of current sample method for three-phase tri-level VIENNA rectifier |
| CN112865560A (en) * | 2021-01-28 | 2021-05-28 | 三峡大学 | Multi-diode series back-to-back bridgeless three-level rectifier |
| CN112865561A (en) * | 2021-01-28 | 2021-05-28 | 三峡大学 | Diode clamping type back-to-back bridgeless three-level rectifier |
| CN113437885A (en) * | 2021-06-28 | 2021-09-24 | 三峡大学 | Three-level rectifier based on diode clamping bidirectional switch |
| WO2023137860A1 (en) * | 2022-01-21 | 2023-07-27 | 薛洛良 | Grounding method for three-phase csr high-frequency pwm rectifier circuit |
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Application publication date: 20130515 |