CN102208813A - Artificial Neutral Point (ANP) power factor correction circuit - Google Patents
Artificial Neutral Point (ANP) power factor correction circuit Download PDFInfo
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- CN102208813A CN102208813A CN2011101196383A CN201110119638A CN102208813A CN 102208813 A CN102208813 A CN 102208813A CN 2011101196383 A CN2011101196383 A CN 2011101196383A CN 201110119638 A CN201110119638 A CN 201110119638A CN 102208813 A CN102208813 A CN 102208813A
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses an Artificial Neutral Point (ANP) power factor correction circuit. The circuit comprises an AC output module, a virtual center line module and a power factor correction module. The AC output module outputs at least two phase voltage. The virtual center line module receives AC voltage outputted by the AC output module, produces an Artificial Neutral Point (ANP) and provides common neutral points for the power factor correction module. The power factor correction module comprises a plurality of same power factor correction units. Each power factor correction unit respectively connects a phase AC voltage outputted by the AC output module, and carries out step-up and step-down and power factor correction treatments on a received single phase alternating current voltage. As the common neutral points of the power factor correction module, neutral point short circuits of each power factor correction units connect output terminus of the virtual center line module. By using the invention, a neutral point is constructed without adding front power frequency transformer, thus the circuit is adapted to the fluctuation of an electrical network, simultaneous the influence of electrical network phase voltage imbalance is inhibited well. The Artificial Neutral Point (ANP) power factor correction circuit provided in the invention has a strong electrical network adaptation capability.
Description
Technical field
The present invention relates to the power factor correction technology field, particularly relate to a kind of virtual neutral circuit of power factor correction.
Background technology
Adopt high-voltage DC UPS (Uninterruptible Power Supply, uninterrupted power supply) to replace traditional interchange UPS, can significantly improve the efficient and the reliability of whole system, reduced the cost of system again simultaneously, thereby have bright market prospects.
Present stage, generally adopt the buck+boost circuit to realize step-up/down.The buck+boost circuit has good power factor emendation function, can realize free parallel connection simultaneously, has obtained in the high-voltage DC UPS field using widely.
But, for the application of this buck+boost circuit on high-voltage DC UPS, have a typical technical barrier: need electrical network to provide center line to realize power factor correction preferably and parallel connection.
In the prior art, mainly can address the above problem by dual mode.
First kind: the front end at high-voltage DC UPS increases an Industrial Frequency Transformer, to produce center line.But this scheme need increase extra high-power Industrial Frequency Transformer, has increased equipment cost, has taken the device space simultaneously.
Second kind: in the inside of high-voltage DC UPS, the mode by capacitor increases virtual neutral.This scheme can be saved the Industrial Frequency Transformer of large volume, only needs to increase electric capacity cost seldom.But also there is an important disadvantages in this scheme: under the situation of, electrical network phase voltage equilibrium very little at power network fluctuation, can normally move; But big when power network fluctuation, when phase voltage is uneven, just can not guarantee normally to have moved.Therefore, the ability of this scheme adaptation electrical network is very weak.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of virtual neutral circuit of power factor correction, can be under the prerequisite of the Industrial Frequency Transformer that does not increase front end, construct a virtual neutral, make the fluctuation that circuit can the self adaptation electrical network, the simultaneously all right unbalanced influence of good restraining electrical network phase voltage has very strong electrical network adaptive capacity.
The embodiment of the invention provides a kind of virtual neutral circuit of power factor correction, and described circuit comprises: AC output module, virtual neutral module, power factor correction module;
Described AC output module is used to export two-phase alternating current pressure at least;
Described virtual neutral module is used to receive the alternating voltage that described AC output module is exported, and produces a virtual neutral, for described power factor correction module provides public mid point;
Described power factor correction module comprises several same power factor correction unit; Each power factor correction unit connects a cross streams voltage of described AC output module output respectively, is used for the single-phase alternating current that receives is compressed into capable buck and power factor correction;
The positive output end short circuit of each power factor correction unit; The negative output terminal short circuit of each power factor correction unit; The mid point short circuit of each power factor correction unit as the common-midpoint of described power factor correction module, connects the output of described virtual neutral module.
Preferably, described virtual neutral module is: the virtual neutral network that several inductance coupling high constitute;
The output of the described AC output module of input termination of described virtual neutral network, the common-midpoint of the described power factor correction module of output termination of described virtual neutral network.
Preferably, when described AC output module is exported three-phase alternating voltage,
Described virtual neutral network comprises: first inductance, second inductance, the 3rd inductance, the 4th inductance, the 5th inductance, the 6th inductance and three magnetic cores;
The shared magnetic core of described first inductance and second inductance; The shared magnetic core of the 3rd inductance and the 4th inductance; The shared magnetic core of the 5th inductance and the 6th inductance;
Described first inductance, the 3rd inductance, the 5th inductance adopt the star connection, Y connection mode; The different name end of the different name end of described first inductance, the different name end of the 3rd inductance, the 5th inductance connects a phase output voltage of described AC output module respectively, the end short circuit of the same name of the end of the same name of described first inductance, the end of the same name of the 3rd inductance, the 5th inductance is as the output of described virtual neutral network;
Described second inductance, the 4th inductance, the 6th inductance adopt the delta connection mode.
Preferably, when described AC output module is exported three-phase alternating voltage,
Described virtual neutral network comprises: the 7th inductance, the 8th inductance, the 9th inductance, the tenth inductance, the 11 inductance, the 12 inductance and three magnetic cores;
The shared magnetic core of described the 7th inductance and the 8th inductance; The shared magnetic core of the 9th inductance and the tenth inductance; The shared magnetic core of the 11 inductance and the 12 inductance;
The different name end of the different name end of described the 7th inductance, the different name end of the 8th inductance, the 9th inductance connects a phase output voltage of described AC output module respectively;
The different name end of described the 12 inductance of termination of the same name of described the 7th inductance, the different name end of described the 8th resistance of termination of the same name of described the 9th inductance, the different name end of described the tenth inductance of termination of the same name of described the 11 inductance;
The end short circuit of the same name of the end of the same name of described the 8th inductance, the end of the same name of the tenth inductance, the 12 inductance is as the output of described virtual neutral network.
Preferably, when described AC output module is exported three-phase alternating voltage,
Described virtual neutral network comprises: the 13 inductance, the 14 inductance, the 15 inductance and a magnetic core; Described the 13 inductance, the 14 inductance, the 15 inductance are wound on respectively on the stem stem of described magnetic core;
Described the 13 inductance, the 14 inductance, the 15 inductance adopt the star connection, Y connection mode; The end of the same name of the end of the same name of described the 13 inductance, the end of the same name of the 14 inductance, the 15 inductance connects a phase output voltage of described AC output module respectively;
The different name end of described the 13 inductance, the different name end of the 14 inductance, the different name end short circuit of the 15 inductance are as the output of described virtual neutral network.
Preferably, when described AC output module is exported three-phase alternating voltage,
Described virtual neutral network comprises: the 16 inductance, the 17 inductance, the 18 inductance, the 19 inductance, the 20 inductance, the 21 inductance and a magnetic core;
One pillar of described the 16 inductance and the shared described magnetic core of the 17 inductance, a pillar of described the 18 inductance and the shared described magnetic core of the 19 inductance, a pillar of described the 20 inductance and the shared described magnetic core of the 21 inductance;
Described the 16 inductance, the 18 inductance, the 20 inductance adopt the star connection, Y connection mode; The end of the same name of the end of the same name of described the 16 inductance, the end of the same name of the 18 inductance, the 20 inductance connects a phase output voltage of described AC output module respectively, the different name end of described the 16 inductance, the different name end of the 18 inductance, the different name end short circuit of the 20 inductance are as the output of described virtual neutral network;
Described the 17 inductance, the 19 inductance, the 21 inductance adopt the delta connection mode.
Preferably, when described AC output module output two-phase alternating current is pressed,
Described virtual neutral network comprises: the 22 inductance, the 23 inductance, the 24 inductance, the 25 inductance and two magnetic cores;
Described the 22 inductance and the shared magnetic core of the 23 inductance; Described the 24 inductance and the shared magnetic core of the 25 inductance;
The end of the same name of described the 22 inductance and the different name end of the 24 inductance connect an output voltage mutually of described AC output module respectively, the different name end of described the 22 inductance and the end short circuit of the same name of the 24 inductance are as the output of described virtual neutral network;
The end of the same name of termination the 25 inductance of the same name of described the 23 inductance, the different name end of described the 23 inductance of different name termination of described the 25 inductance.
Preferably, when described AC output module output two-phase alternating current is pressed,
Described virtual neutral network comprises: the 26 inductance, the 27 inductance and a magnetic core; Described the 26 inductance and the shared described magnetic core of the 27 inductance;
The end of the same name of described the 26 inductance and the different name end of described the 27 inductance connect an output voltage mutually of described AC output module respectively;
The different name end of described the 26 inductance and the end short circuit of the same name of described the 27 inductance are as the output of described virtual neutral network.
Preferably, described power factor correction unit comprises: rectification circuit and buck-boost circuit;
Described rectification circuit has an input, first output and second output; The input of described rectification circuit connects a cross streams voltage of described AC output module output as the input of described power factor correction unit, is used for the single-phase alternating current that receives is compressed into capable rectification, and exports described buck-boost circuit to;
Described buck-boost circuit has the first input end and second input, connects first output and second output of described rectification circuit respectively; Described buck-boost circuit also has first output, second output and the 3rd output;
The first output short circuit of the buck-boost circuit of each power factor correction unit is as the positive output end of described power factor correction module; The second output short circuit of the buck-boost circuit of each power factor correction unit is as the negative output terminal of described power factor correction module; The 3rd output short circuit of the buck-boost circuit of each power factor correction unit is as the common-midpoint of described power factor correction module;
Described buck-boost circuit is used for the single-phase voltage after the described rectification circuit rectification is carried out buck and power factor correction.
Preferably, described rectification circuit comprises: first diode and second diode; The negative electrode short circuit of the anode of described first diode and described second diode is as the input of described rectification circuit; The negative electrode of described first diode is as first output of described rectification circuit, and the anode of described second diode is as second output of described rectification circuit;
Perhaps,
Described rectification circuit comprises: first power tube and second power tube; The drain electrode short circuit of the source electrode of described first power tube and second power tube is as the input of described rectification circuit; The drain electrode of described first power tube is as first output of described rectification circuit, and the source electrode of described second power tube is as second output of described rectification circuit.
Preferably, described buck-boost circuit comprises:
The drain electrode short circuit of the drain electrode of the 13 switching tube and first switching tube is as the first input end of described buck-boost circuit;
The source electrode of described the 13 switching tube connects the negative electrode of the 8th diode and an end of the one one inductance, and the source electrode of described first switching tube connects the negative electrode of the 7th diode and an end of the one or two inductance;
Behind the other end of described the one one inductance and the other end short circuit of the one or two inductance, connect the drain electrode of the 4th switching tube and the anode of the 11 diode jointly; The negative electrode of described the 11 diode is as first output of described buck-boost circuit;
The source shorted of the source electrode of the 14 switching tube and second switch pipe is as second input of described buck-boost circuit;
The drain electrode of described the 14 switching tube connects the anode of the tenth diode and an end of the one or four inductance, and the drain electrode of described second switch pipe connects the anode of the 9th diode and an end of the one or three inductance; Behind the other end of described the one or four inductance and the other end short circuit of the one or three inductance, connect the source electrode of the 3rd switching tube and the negative electrode of the 12 diode jointly; The anode of described the 12 diode is as second output of described buck-boost circuit;
The drain electrode short circuit of the negative electrode of the negative electrode of the source electrode of the anode of the anode of described the 8th diode, the 7th diode, the 4th switching tube, the 9th diode, the tenth diode and the 3rd switching tube is as the 3rd output of described buck-boost circuit;
First electric capacity also is connected between first output and the 3rd output of described buck-boost circuit; Second electric capacity also is connected between the 3rd output and second output of described buck-boost circuit
According to specific embodiment provided by the invention, the invention discloses following technique effect:
The described virtual neutral circuit of power factor correction of the embodiment of the invention, in the inner virtual neutral module that increases of high-voltage DC UPS, be used to produce a virtual neutral, for described power factor correction module provides public mid point, can under the prerequisite of the Industrial Frequency Transformer that does not increase front end, construct a virtual neutral thus, make the fluctuation that circuit can the self adaptation electrical network, the simultaneously all right unbalanced influence of good restraining electrical network phase voltage has very strong electrical network adaptive capacity.
Description of drawings
Fig. 1 is the structure chart of the virtual neutral circuit of power factor correction of the embodiment of the invention one;
Fig. 2 is first kind of implementation structure chart of the virtual neutral module of the embodiment of the invention;
Fig. 3 is second kind of implementation structure chart of the virtual neutral module of the embodiment of the invention;
Fig. 4 is the third implementation structure chart of the virtual neutral module of the embodiment of the invention;
Fig. 5 is the 4th a kind of implementation structure chart of the virtual neutral module of the embodiment of the invention;
Fig. 6 is the 5th a kind of implementation structure chart of the virtual neutral module of the embodiment of the invention;
Fig. 7 is the 6th a kind of implementation structure chart of the virtual neutral module of the embodiment of the invention;
Fig. 8 is the virtual neutral circuit of power factor correction figure of the embodiment of the invention two;
Fig. 9 is the circuit structure diagram of the power factor correction unit of the embodiment of the invention;
Figure 10 a is the first mode work schematic diagram of an Active PFC unit of the embodiment of the invention;
Figure 10 b is the second mode work schematic diagram of an Active PFC unit of the embodiment of the invention;
Figure 10 c is the 3rd a mode work schematic diagram of an Active PFC unit of the embodiment of the invention;
Figure 11 a to 11e is the oscillogram of power factor correction module shown in Figure 8;
Figure 12 is the virtual neutral circuit of power factor correction figure of the embodiment of the invention three;
Figure 13 is the virtual neutral circuit of power factor correction figure of the embodiment of the invention four;
Figure 14 is the virtual neutral circuit of power factor correction figure of the embodiment of the invention five.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
In view of this, the object of the present invention is to provide a kind of virtual neutral circuit of power factor correction, can be under the prerequisite of the Industrial Frequency Transformer that does not increase front end, construct a virtual neutral, make the fluctuation that circuit can the self adaptation electrical network, the simultaneously all right unbalanced influence of good restraining electrical network phase voltage has very strong electrical network adaptive capacity.
With reference to Fig. 1, the virtual neutral circuit of power factor correction structure chart that provides for the embodiment of the invention one.Described circuit comprises: AC output module 10, virtual neutral module 20, power factor correction module 30.
Wherein, described AC output module 10 is used to export two-phase alternating current pressure at least.
Need to prove that described AC output module 10 can be exported the above alternating voltage of two-phase, three-phase or three-phase.Described AC output module 10 can comprise at least two single phase poaer supplies, and each single phase poaer supply is exported a cross streams voltage respectively.
The output of the described AC output module 10 of input termination of described virtual neutral module 20, the common-midpoint of the described power factor correction module 30 of output termination of described virtual neutral module 20; Described virtual neutral module 20 is used to receive the alternating voltage that described AC output module 10 is exported, and produces a virtual neutral, for described power factor correction module 30 provides public mid point.
Described power factor correction module 30, comprise several same power factor correction unit, each power factor correction unit connects a cross streams voltage of described AC output module 10 outputs respectively, is used for the single-phase alternating current that receives is compressed into capable buck and power factor correction; Behind the mid point short circuit of each power factor correction unit,, connect the output of described virtual neutral module 20 as the common-midpoint of described power factor correction module 30.
Need to prove that the number of the power factor correction unit that described power factor correction module 30 comprises is identical with the number of phases of the alternating voltage of described AC output module 10 outputs.
The described virtual neutral circuit of power factor correction of the embodiment of the invention, in the inner virtual neutral module 20 that increases of high-voltage DC UPS, be used to produce a virtual neutral, for described power factor correction module 30 provides public mid point, can under the prerequisite of the Industrial Frequency Transformer that does not increase front end, construct a virtual neutral thus, make the fluctuation that circuit can the self adaptation electrical network, the simultaneously all right unbalanced influence of good restraining electrical network phase voltage has very strong electrical network adaptive capacity.
In the embodiment of the invention, described virtual neutral module 20 can be virtual neutral (ANP:Artificial Neutral Point) network that several inductance coupling high constitute.The input of this virtual neutral network receives each cross streams voltage of described AC output module 10 outputs, and the common-midpoint of the described power factor correction module 30 of its output termination is for described power factor correction module 30 provides public mid point.
The concrete implementation of several virtual neutral modules 20 that provide below in conjunction with the embodiment of the invention describes in detail.
With reference to Fig. 2, first kind of implementation structure chart of the virtual neutral module 20 that provides for the embodiment of the invention.Virtual neutral module 20 shown in Figure 2 is used for the situation of described AC output module 10 output three-phase alternating voltages.
As shown in Figure 2, described virtual neutral module 20 comprises six inductance and three magnetic cores, the shared in twos magnetic core of these six inductance.
Concrete, described virtual neutral module 20 comprises: first inductance L 1, second inductance L 2, the 3rd inductance L 3, the 4th inductance L 4, the 5th inductance L 5, the 6th inductance L 6 and three magnetic cores.Wherein, first inductance L 1 and second inductance L, 2 shared magnetic cores; The 3rd inductance L 3 and the 4th inductance L 4 shared magnetic cores; The 5th inductance L 5 and the 6th inductance L 6 shared magnetic cores.
Described first inductance L 1, the 3rd inductance L 3, the 5th inductance L 5 adopt the star connection, Y connection mode.Concrete, the different name end of the different name end of the different name end of described first inductance L 1, the 3rd inductance L 3, the 5th inductance L 5 connects a phase output voltage of described AC output module 10 respectively, the end short circuit of the same name of the end of the same name of the end of the same name of described first inductance L 1, the 3rd inductance L 3, the 5th inductance L 5, as the output of described virtual neutral module 20, connect the common-midpoint of described power factor correction module 30.
Described second inductance L 2, the 4th inductance L 4, the 6th inductance L 6 adopt the delta connection mode.Concrete, the end of the same name of described the 4th inductance L 4 of the different name termination of described second inductance L 2; The end of the same name of described the 6th inductance L 6 of the different name termination of described the 4th inductance L 4; The end of the same name of described second inductance L 2 of the different name termination of described the 6th inductance L 6.
Described virtual neutral module 20 is used to produce virtual neutral, for power factor correction module 30 provides public mid point.Described public mid point is the center of gravity of three-phase voltage vector, and its current potential equals the N point current potential of far-end power plant, is the virtual center line in high-voltage DC UPS inside.
With reference to Fig. 3, second kind of implementation structure chart of the virtual neutral module 20 that provides for the embodiment of the invention.Virtual neutral module 20 shown in Figure 3 is applicable to the situation of described AC output module 10 output three-phase alternating voltages.
As shown in Figure 3, described virtual neutral module 20 is with the identical point of implementation shown in Figure 2: also comprise six inductance and three magnetic cores, the shared in twos magnetic core of these six inductance.
Concrete, described virtual neutral module 20 comprises: the 7th inductance L 7, the 8th inductance L 8, the 9th inductance L 9, the tenth inductance L the 10, the 11 inductance L the 11, the 12 inductance L 12 and three magnetic cores.Wherein, the 7th inductance L 7 and the 8th inductance L 8 shared magnetic cores; The 9th inductance L 9 and the tenth inductance L 10 shared magnetic cores; The 11 inductance L 11 and the 12 inductance L 12 shared magnetic cores.
Implementation shown in Figure 3 is with difference shown in Figure 2: the different name end of the different name end of described the 7th inductance L 7, the 8th inductance L 8, the different name end of the 9th inductance L 9 connect an output voltage mutually of described AC output module 10 respectively; The different name end of described the 12 inductance L 12 of termination of the same name of described the 7th inductance L 7, the different name end of described the 8th resistance L8 of the termination of the same name of described the 9th inductance L 9, the different name end of described the tenth inductance L 10 of the termination of the same name of described the 11 inductance L 11; The end of the same name of the end of the same name of described the 8th inductance L 8, the tenth inductance L 10, the end short circuit of the same name of the 12 inductance L 12 as the output of described virtual neutral module 20, connect the common-midpoint of described power factor correction module 30.
With reference to Fig. 4, the third implementation structure chart of the virtual neutral module 20 that provides for the embodiment of the invention.Virtual neutral module 20 shown in Figure 4 is applicable to the situation of described AC output module 10 output three-phase alternating voltages.
As shown in Figure 4, described virtual neutral module 20 comprises: a magnetic core and three inductance, and the shared described magnetic core of these three inductance, and these three inductance are wound on respectively on three stem stems of this EI magnetic core.
Concrete, described virtual neutral module 20 comprises: the 13 inductance L the 13, the 14 inductance L the 14, the 15 inductance L 15 and magnetic core.Described the 13 inductance L the 13, the 14 inductance L the 14, the 15 inductance L 15 is wound on respectively on the stem stem of described magnetic core.
Described the 13 inductance L the 13, the 14 inductance L the 14, the 15 inductance L 15 adopts the star connection, Y connection mode.Concrete, the end of the same name of the end of the same name of described the 13 inductance L 13, the end of the same name of the 14 inductance L 14, the 15 inductance L 15 connects a phase output voltage of described AC output module 10 respectively; The different name end of described the 13 inductance L 13, the different name end of the 14 inductance L 14, the different name end short circuit of the 15 inductance L 15 as the output of described virtual neutral module 20, connect the common-midpoint of described power factor correction module 30.
With reference to Fig. 5, the 4th kind of implementation structure chart of the virtual neutral module 20 that provides for the embodiment of the invention.Virtual neutral module 20 shown in Figure 5 is applicable to the situation of described AC output module 10 output three-phase alternating voltages.
As shown in Figure 5, described virtual neutral module 20 comprises: a magnetic core and six inductance, these six inductance are a stem stem of shared described magnetic core in twos.
Concrete, described virtual neutral module 20 comprises: the 16 inductance L the 16, the 17 inductance L the 17, the 18 inductance L the 18, the 19 inductance L the 19, the 20 inductance L the 20, the 21 inductance L 21 and magnetic core.One pillar of described the 16 inductance L 16 and the 17 inductance L 17 shared described magnetic cores, a pillar of described the 18 inductance L 18 and the 19 inductance L 19 shared described magnetic cores, a pillar of the 20 inductance L 20 and the 21 inductance L 21 shared described magnetic cores.
Described the 16 inductance L the 16, the 18 inductance L the 18, the 20 inductance L 20 adopts the star connection, Y connection mode.Concrete, the end of the same name of the end of the same name of described the 16 inductance L 16, the end of the same name of the 18 inductance L 18, the 20 inductance L 20 connects a phase output voltage of described AC output module 10 respectively, the different name end of described the 16 inductance L 16, the different name end of the 18 inductance L 18, the different name end short circuit of the 20 inductance L 20, as the output of described virtual neutral module 20, connect the common-midpoint of described power factor correction module 30.
Described the 17 inductance L the 17, the 19 inductance L the 19, the 21 inductance L 21 adopts the delta connection mode.Concrete, the end of the same name of described the 19 inductance L 19 of different name termination of described the 17 inductance L 17; The end of the same name of described the 21 inductance L 21 of different name termination of described the 19 inductance L 19; The end of the same name of described the 17 inductance L 17 of different name termination of described the 21 inductance L 21.
With reference to Fig. 6, the 5th kind of implementation structure chart of the virtual neutral module 20 that provides for the embodiment of the invention.Virtual neutral module 20 shown in Figure 6 is used for the situation of described AC output module 10 outputs two alternating voltages.
As shown in Figure 6, described virtual neutral module 20 comprises four inductance and two magnetic cores, the shared in twos magnetic core of these four inductance.
Concrete, described virtual neutral module 20 comprises: the 22 inductance L the 22, the 23 inductance L the 23, the 24 inductance L the 24, the 25 inductance L 25 and two magnetic cores.Wherein, described the 22 inductance L 22 and the 23 inductance L 23 shared magnetic cores; Described the 24 inductance L 24 and the 25 inductance L 25 shared magnetic cores.
The end of the same name of described the 22 inductance L 22 and the different name end of the 24 inductance L 24 connect an output voltage mutually of described AC output module 10 respectively, the different name end of described the 22 inductance L 22 and the end short circuit of the same name of the 24 inductance L 24, as the output of described virtual neutral module 20, connect the common-midpoint of described power factor correction module 30.
The end of the same name of termination of the same name the 25 inductance L 25 of described the 23 inductance L 23, the different name end of described the 23 inductance L 23 of different name termination of described the 25 inductance L 25.
With reference to Fig. 7, the 6th kind of implementation structure chart of the virtual neutral module 20 that provides for the embodiment of the invention.Virtual neutral module 20 shown in Figure 7 is used for the situation of described AC output module 10 outputs two alternating voltages.
As shown in Figure 7, described virtual neutral module 20 comprises two inductance and a magnetic core, the shared described magnetic core of these two inductance.
Concrete, described virtual neutral module 20 comprises: the 26 inductance L the 26, the 27 inductance L 27 and a magnetic core.Described the 26 inductance L 26 and the 27 inductance L 27 shared described magnetic cores.The end of the same name of described the 26 inductance L 26 and the different name end of described the 27 inductance L 27 connect an output voltage mutually of described AC output module 10 respectively, the different name end of described the 26 inductance L 26 and the end short circuit of the same name of described the 27 inductance L 27, as the output of described virtual neutral module 20, connect the common-midpoint of described power factor correction module 30.
The above embodiment of the present invention is that example describes with AC output module 10 output two-phases or three-phase alternating voltage respectively.When described AC output module 10 output heterogeneous (more than the three-phase) alternating voltages, the structure of described virtual neutral module 20 can be identical with the structure of each implementation of introducing in the foregoing description, only needs the corresponding quantity that increases inductance and magnetic core to get final product.
The power factor correction module 30 that the embodiment of the invention is provided describes in detail below.
With reference to Fig. 8, the virtual neutral circuit of power factor correction figure that provides for the embodiment of the invention two.As shown in Figure 8, in the embodiment of the invention two, providing the situation of three-phase alternating current output with AC output module 10 is that example describes.
As shown in Figure 8, described AC output module 10 can comprise three single phase poaer supply U1, U2, U3, this single phase poaer supply U1, U2, U3 are respectively the different single-phase output of a multi-phase AC power, concrete, three single phase poaer supply U1, U2 of described AC output module 10, U3 export U, V, W three-phase voltage respectively.
The three-phase output end of the described AC output module 10 of input termination of described virtual neutral module 20 as shown in Figure 8, is the output of three single phase poaer supplies that connect described AC output module 10 respectively; The common-midpoint of the described power factor correction module 30 of output termination of described virtual neutral module 20.
As shown in Figure 8, corresponding, described power factor correction module 30 comprises three identical power factor correction unit S1, S2, S3, realizes respectively the single-phase voltage of each single phase poaer supply output is carried out buck and power factor correction, realizes tri-level circuit simultaneously.
The input of each power factor correction unit connects an output mutually of described AC output module 10 respectively; The positive output end short circuit of each power factor correction unit, the negative output terminal short circuit of each power factor correction unit; Behind the mid point short circuit of each power factor correction unit,, connect the output of described virtual neutral module 20 as the common-midpoint of described virtual neutral module 20.
For example, the output of the input order phase power supply U1 of power factor correction unit S1 receives the U phase voltage that AC output module 10 is exported; The output of the input order phase power supply U2 of power factor correction unit S2 receives the V phase voltage that AC output module 10 is exported; The output of the input order phase power supply U3 of power factor correction unit S3 receives the W phase voltage that AC output module 10 is exported.
As shown in Figure 8, in the embodiment of the invention one, the circuit structure of three power factor correction unit S1, S2, S3 is identical.Therefore, be that example describes only with power factor correction unit S1.
With reference to shown in Figure 9, the circuit structure diagram of the power factor correction unit that provides for the embodiment of the invention.Described power factor correction unit S1 comprises: rectification circuit 310 and buck-boost circuit 320.
Described rectification circuit 310 has an input, first output and second output; The input of described rectification circuit 310 connects a cross streams voltage of described AC output module 10 outputs as the input of described power factor correction unit S1.
Described buck-boost circuit 320 has the first input end and second input, connects first output and second output of described rectification circuit 310 respectively; Described buck-boost circuit 320, also have first output, second output and the 3rd output, first output of described buck-boost circuit 320 is as first output of described power factor correction unit S1, second output of described buck-boost circuit 320 is as second output of described power factor correction unit S1, and the 3rd output of described buck-boost circuit 320 is as the mid point of described power factor correction unit S1.
The first output short circuit of each power factor correction unit is as the positive output end of described power factor correction module 30; The second output short circuit of each power factor correction unit is as the negative output terminal of described power factor correction module 30; The mid point short circuit of each power factor correction unit is as the common-midpoint of described power factor correction module 30.
Described rectification circuit 310 is used for the single-phase alternating current that the described AC output module 10 that receives is exported is compressed into capable rectification, and exports described buck-boost circuit 320 to.
Described buck-boost circuit 320 is used for the single-phase voltage after the rectification that receives is carried out buck and power factor correction.
Described rectification circuit 310 can comprise: the first diode D1 and the second diode D2.
The negative electrode short circuit of the anode of the described first diode D1 and the described second diode D2 as the input of described rectification circuit 310, is the input of described power factor correction unit S1, connects an output mutually of described AC output module 10; The negative electrode of the described first diode D1 is as first output of described rectification circuit 310, and the anode of the described second diode D2 is as second output of described rectification circuit 310.
Described buck-boost circuit 320 can be divided into upper and lower two parts.
Wherein, the first half circuit of described buck-boost circuit 320 can comprise: the 13 switching tube Q13, the first switching tube Q1, the one one inductance L 1 ', the one or two inductance L 2 ', the 7th diode D7, the 8th diode D8, the 4th switching tube Q4, the 11 diode D11, first capacitor C 1.
Be specially: the drain electrode short circuit of the drain electrode of described the 13 switching tube Q13 and the described first switching tube Q1 as the first input end of described buck-boost circuit 320, connects first output of described rectification circuit 310; The source electrode of described the 13 switching tube Q13 connect the negative electrode of described the 8th diode D8 and the one one inductance L 1 ' an end, the source electrode of the described first switching tube Q1 connect the negative electrode of described the 7th diode D7 and the one or two inductance L 2 ' an end; Described the one one inductance L 1 ' the other end and the one or two inductance L 2 ' other end short circuit after, connect the drain electrode of described the 4th switching tube Q4 and the anode of described the 11 diode D11 jointly; The negative electrode of described the 11 diode D11 also is the positive output end of described power factor correction unit S1 as first output of described buck-boost circuit 320; The source shorted of the anode of the anode of described the 8th diode D8, described the 7th diode D7 and described the 4th switching tube Q4 as the 3rd output of described buck-boost circuit 320, also is the mid point of described power factor correction unit S1; Described first capacitor C 1 also is connected between first output and the 3rd output of described buck-boost circuit 320, also is between the positive output end and mid point that is connected on described power factor correction unit S1.
Need to prove, the first half circuit of described buck-boost circuit 320 has adopted Interleaving and Transformer Paralleling, described the one one inductance L 1 ' and the one or two inductance L 2 ' in 180 ° of switching current phase differences, described the one one inductance L 1 ' and the one or two inductance L 2 ' the electric current sum be the incoming line electric current, current continuity is good.
The lower part circuit of described buck-boost circuit 320 can comprise: second switch pipe Q2, the 14 switching tube Q14, the one or three inductance L 3 ', the one or four inductance L 4 ', the 9th diode D9, the tenth diode D10, the 3rd switching tube Q3, the 12 diode D12, second capacitor C 2.
Be specially: the source shorted of the source electrode of described the 14 switching tube Q14 and described second switch pipe Q2 as second input of described buck-boost circuit 320, connects second output of described rectification circuit 310; The drain electrode of described the 14 switching tube Q14 connect the anode of described the tenth diode D10 and the one or four inductance L 4 ' an end, the drain electrode of described second switch pipe Q2 connect the anode of described the 9th diode D9 and the one or three inductance L 3 ' an end; Described the one or four inductance L 4 ' the other end and the one or three inductance L 3 ' other end short circuit after, connect the source electrode of described the 3rd switching tube Q3 and the negative electrode of described the 12 diode D12 jointly; The anode of described the 12 diode D12 also is the negative output terminal of described power factor correction unit S1 as second output of described buck-boost circuit 320; The drain electrode short circuit of the negative electrode of the negative electrode of described the 9th diode D9, described the tenth diode D10 and described the 3rd switching tube Q3 connects the 3rd output of described buck-boost circuit 320, also is the mid point of power factor correction unit S1; Described second capacitor C 2 also is connected between second output and the 3rd output of described buck-boost circuit 320, also is between the mid point and negative output terminal that is connected on described power factor correction unit S1.
Need to prove, the latter half circuit of described buck-boost circuit 320 has adopted Interleaving and Transformer Paralleling, described the one or three inductance L 3 ' and the one or four inductance L 4 ' in 180 ° of switching current phase differences, described the one or three inductance L 3 ' and the one or four inductance L 4 ' the electric current sum be the incoming line electric current, current continuity is good.
The circuit structure of described power factor correction unit S2 and power factor correction unit S3 is identical with power factor correction unit S1 with principle, does not repeat them here.
The boost diode of each power factor correction unit, diode D11 and the diode D17 of D12, S2 and D23 and the D24 of D18, S3 as S1 among Fig. 9, as natural parallel diode, can realize the positive output end short circuit and the negative output terminal short circuit of each power factor correction unit; And the mid point short circuit of each power factor correction unit as the common-midpoint of described power factor correction module 30, connects the output of described virtual neutral module 20.
Operation principle to the described power factor correction module 30 of the embodiment of the invention is described in detail below.Described power factor correction module 30 adopts the Sliding-Mode Control Based mode, realizes power factor correction and output buck.Described Active PFC module 30 has 6 mode.Here be that example describes still with power factor correction unit S1.
With reference to Figure 10 a to 10c, be the work schematic diagram of first mode, second mode and the 3rd mode of an Active PFC unit of the embodiment of the invention.
The course of work of first mode is shown in Figure 10 a: at t0 constantly, A imports positive going zeror crossing mutually, the first half circuit working of described Active PFC cell S 1, and the latter half circuit stops; At t＞t0 constantly, described power factor correction unit S1 is operated in the boost pattern, the described first switching tube Q1, the 13 switching tube Q13 continue open-minded, described switching tube Q4 carries out SPM (Self-phase Modulation, from phase place) pulse-width modulation, when the 4th switching tube Q4 opened, current circuit was the first diode D1 → first switching tube Q1 (the 13 switching tube Q13) → the one one inductance L 1 ' (the one or two inductance L 2 ') → the 4th switching tube Q4; When the 4th switching tube Q4 turn-offed, current circuit was the first diode D1 → first switching tube Q1 (the 13 switching tube Q13) → the one one inductance L 1 ' (the one or two inductance L 2 ') → the 11 diode D11 → first capacitor C 1.Described Active PFC cell S 1 realizes that when first mode voltage promotes, and reaches target busbar voltage Vbus.When the input instantaneous voltage was increased to critical value V1, first mode finished, and corresponding is t1 constantly.
The course of work of second mode is shown in Figure 10 b: at t＞t1 constantly, described power factor correction unit S1 is operated in the buck pattern, described the 4th switching tube Q4 continues to turn-off, the described first switching tube Q1, the 13 switching tube Q13 carry out the SPM pulse-width modulation respectively, 180 ° of their driving phase differences.The described first switching tube Q1 (or the 13 switching tube Q13) is when opening, and current circuit is the first diode D1 → first switching tube Q1 (the 13 switching tube Q13) → the one one inductance L 1 ' (the one or two inductance L 2 ') → the 11 diode D11 → first capacitor C 1; When the first switching tube Q1 (or the 13 switching tube Q13) turn-offed, current circuit was the 7th diode D7 (the 8th diode D8) → the one one inductance L 1 ' (the one or two inductance L 2 ') → the 11 diode D11 → first capacitor C 1.Described Active PFC cell S 1 realizes that when second mode voltage reduces, and reaches target busbar voltage Vbus.Be reduced to critical value V1 again when the input instantaneous voltage is increased to maximum, second mode finishes, and corresponding is t2 constantly.
The course of work of the 3rd mode is shown in Figure 10 c: at t＞t2 constantly, described power factor correction unit S1 is operated in the boost pattern once more, the described first switching tube Q1, the 13 switching tube Q13 continue open-minded, and described the 4th switching tube Q4 carries out the SPM pulse-width modulation.When described the 4th switching tube Q4 opened, current circuit was the first diode D1 → first switching tube Q1 (the 13 switching tube Q13) → the one one inductance L 1 ' (the one or two inductance L 2 ') → the 4th switching tube Q4; When described the 4th switching tube Q4 turn-offed, current circuit was the first diode D1 → first switching tube Q1 (the 13 switching tube Q13) → the one one inductance L 1 ' (the one or two inductance L 2 ') → the 11 diode D11 → first capacitor C 1.Described Active PFC cell S 1 realizes that in the 3rd mode voltage promotes, and reaches target busbar voltage Vbus.Finish when the input instantaneous voltage is reduced to 0, the three mode by critical value V1, corresponding is t3 constantly.
At t3 constantly, A imports the negative sense zero passage mutually, and the first half circuit of described power factor correction unit S1 stops, the latter half circuit working.Described power factor correction unit is operated in the 4th mode, the 5th mode and the 6th mode, with the said process symmetry, gives unnecessary details no longer one by one respectively.
With reference to Figure 11 a to 11e, be respectively the oscillogram of power factor correction module 30 shown in Figure 8.
Shown in Figure 11 a, CH1 to CH4 is respectively the drive waveforms of the first switching tube Q1, the 4th switching tube Q4, second switch pipe Q2 and the 3rd switching tube Q3 that four passages record, adopts pulse-width modulation.
Shown in Figure 11 b, CH1 is the electric current of the first switching tube Q1 that records, and CH2 is the electric current of the 4th switching tube Q4 that records, and all the other each channels drive waveforms are associated.
Shown in Figure 11 c, CH1 is the electric current of the 7th diode D7, and CH2 is the electric current of the 11 diode D11.
Shown in Figure 11 d, CH1 to CH3 is respectively A, B, the C phase current of three-phase alternating-current supply.
Shown in Figure 11 e, CH1 is the voltage waveform at bus (i.e. first capacitor C 1 and second capacitor C, 2 two ends).Can see that busbar voltage is stable to rise, and reaches and continue the magnitude of voltage of held stationary at the 90ms place.
The power factor correction module 30 that the embodiment of the invention provides does not need to increase input filter, does not need to increase anti-stifled diode, realized cleverly the parallel connection of multimode and input current continuously; And the stresses of parts that the embodiment of the invention adopts is little, cost is low, overall efficiency is high.
With reference to Figure 12, the virtual neutral circuit of power factor correction figure that provides for the embodiment of the invention three.The difference of circuit shown in Figure 12 and circuit shown in Figure 8 is that the rectification circuit of described power factor correction unit adopts switching tube synchronous rectification to realize.Concrete, the rectification circuit of each power factor correction unit adopts switching tube to substitute diode.
Concrete, be that example describes still with power factor correction unit S1.As shown in figure 12, described rectification circuit 310 can comprise: the first power tube SW1 and the second power tube SW2.
The drain electrode short circuit of the source electrode of the described first power tube SW1 and the second power tube SW2 as the input of described power factor correction unit S1, connects an output mutually of described AC output module 10; The drain electrode of the described first power tube SW1 is as first output of described rectification circuit 310, and the source electrode of the described second power tube SW2 is as second output of described rectification circuit 310.
The buck-boost circuit 320 of described power factor correction unit S1 is identical with circuit shown in Figure 8.
Embodiment illustrated in fig. 12 three circuit and embodiment illustrated in fig. 8 two identical not the repeating them here of circuit theory.
With reference to Figure 13, the virtual neutral circuit of power factor correction figure that provides for the embodiment of the invention four.The difference of circuit shown in Figure 13 and circuit shown in Figure 8 is that described AC output module 10 provides the output of two cross streams.
As shown in figure 13, described AC output module 10 can comprise two single phase poaer supply U1, U2, this single phase poaer supply U1, U2 are respectively the different single-phase output of a multi-phase AC power, and be concrete, and two single phase poaer supply U1, U2 of described AC output module 10 export U, V two phase voltages respectively.
Corresponding, described power factor correction module 30 comprises two identical power factor correction unit S1, S2, realizes respectively the single-phase voltage of each single phase poaer supply output is carried out buck and power factor correction, realizes two level circuits simultaneously.
The circuit structure of embodiment illustrated in fig. 13 four power factor correction unit is identical with circuit shown in Figure 8 with operation principle, does not repeat them here.
With reference to Figure 14, the virtual neutral circuit of power factor correction figure that provides for the embodiment of the invention five.Embodiment illustrated in fig. 14 five circuit and embodiment illustrated in fig. 12 three difference are that described AC output module 10 provides the output of two cross streams.
The circuit structure of embodiment illustrated in fig. 14 five power factor correction unit is identical with circuit shown in Figure 12 with operation principle, does not repeat them here.
The above embodiment of the present invention is that example describes with AC output module 10 output two-phases or three-phase alternating voltage respectively.When described AC output module 10 is exported heterogeneous (more than the three-phase) alternating voltages, the structure of described power factor correction module 30 can be identical with the structure of each implementation of introducing in the foregoing description, only needs the corresponding quantity that increases the power factor correction unit that described power factor correction module 30 comprises to get final product.Concrete, the quantity of the power factor correction unit that described power factor correction module 30 comprises equates with the number of phases of the alternating voltage of described AC output module 10 outputs.
The circuit of power factor correction that the embodiment of the invention provides does not need to increase input filter, does not need to increase anti-stifled diode, realized cleverly the parallel connection of multimode and input current continuously; And the stresses of parts that the embodiment of the invention adopts is little, cost is low, overall efficiency is high.
More than to a kind of virtual neutral circuit of power factor correction provided by the present invention, be described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part in specific embodiments and applications all can change.In sum, this description should not be construed as limitation of the present invention.
Claims (11)
1. a virtual neutral circuit of power factor correction is characterized in that, described circuit comprises: AC output module, virtual neutral module, power factor correction module;
Described AC output module is used to export two-phase alternating current pressure at least;
Described virtual neutral module is used to receive the alternating voltage that described AC output module is exported, and produces a virtual neutral, for described power factor correction module provides public mid point;
Described power factor correction module comprises several same power factor correction unit; Each power factor correction unit connects a cross streams voltage of described AC output module output respectively, is used for the single-phase alternating current that receives is compressed into capable buck and power factor correction;
The positive output end short circuit of each power factor correction unit; The negative output terminal short circuit of each power factor correction unit; The mid point short circuit of each power factor correction unit as the common-midpoint of described power factor correction module, connects the output of described virtual neutral module.
2. virtual neutral circuit of power factor correction according to claim 1 is characterized in that, described virtual neutral module is: the virtual neutral network that several inductance coupling high constitute;
The output of the described AC output module of input termination of described virtual neutral network, the common-midpoint of the described power factor correction module of output termination of described virtual neutral network.
3. virtual neutral circuit of power factor correction according to claim 2 is characterized in that, when described AC output module is exported three-phase alternating voltage,
Described virtual neutral network comprises: first inductance, second inductance, the 3rd inductance, the 4th inductance, the 5th inductance, the 6th inductance and three magnetic cores;
The shared magnetic core of described first inductance and second inductance; The shared magnetic core of the 3rd inductance and the 4th inductance; The shared magnetic core of the 5th inductance and the 6th inductance;
Described first inductance, the 3rd inductance, the 5th inductance adopt the star connection, Y connection mode; The different name end of the different name end of described first inductance, the different name end of the 3rd inductance, the 5th inductance connects a phase output voltage of described AC output module respectively, the end short circuit of the same name of the end of the same name of described first inductance, the end of the same name of the 3rd inductance, the 5th inductance is as the output of described virtual neutral network;
Described second inductance, the 4th inductance, the 6th inductance adopt the delta connection mode.
4. virtual neutral circuit of power factor correction according to claim 2 is characterized in that, when described AC output module is exported three-phase alternating voltage,
Described virtual neutral network comprises: the 7th inductance, the 8th inductance, the 9th inductance, the tenth inductance, the 11 inductance, the 12 inductance and three magnetic cores;
The shared magnetic core of described the 7th inductance and the 8th inductance; The shared magnetic core of the 9th inductance and the tenth inductance; The shared magnetic core of the 11 inductance and the 12 inductance;
The different name end of the different name end of described the 7th inductance, the different name end of the 8th inductance, the 9th inductance connects a phase output voltage of described AC output module respectively;
The different name end of described the 12 inductance of termination of the same name of described the 7th inductance, the different name end of described the 8th resistance of termination of the same name of described the 9th inductance, the different name end of described the tenth inductance of termination of the same name of described the 11 inductance;
The end short circuit of the same name of the end of the same name of described the 8th inductance, the end of the same name of the tenth inductance, the 12 inductance is as the output of described virtual neutral network.
5. virtual neutral circuit of power factor correction according to claim 2 is characterized in that, when described AC output module is exported three-phase alternating voltage,
Described virtual neutral network comprises: the 13 inductance, the 14 inductance, the 15 inductance and a magnetic core; Described the 13 inductance, the 14 inductance, the 15 inductance are wound on respectively on the stem stem of described magnetic core;
Described the 13 inductance, the 14 inductance, the 15 inductance adopt the star connection, Y connection mode; The end of the same name of the end of the same name of described the 13 inductance, the end of the same name of the 14 inductance, the 15 inductance connects a phase output voltage of described AC output module respectively;
The different name end of described the 13 inductance, the different name end of the 14 inductance, the different name end short circuit of the 15 inductance are as the output of described virtual neutral network.
6. virtual neutral circuit of power factor correction according to claim 2 is characterized in that, when described AC output module is exported three-phase alternating voltage,
Described virtual neutral network comprises: the 16 inductance, the 17 inductance, the 18 inductance, the 19 inductance, the 20 inductance, the 21 inductance and a magnetic core;
One pillar of described the 16 inductance and the shared described magnetic core of the 17 inductance, a pillar of described the 18 inductance and the shared described magnetic core of the 19 inductance, a pillar of described the 20 inductance and the shared described magnetic core of the 21 inductance;
Described the 16 inductance, the 18 inductance, the 20 inductance adopt the star connection, Y connection mode; The end of the same name of the end of the same name of described the 16 inductance, the end of the same name of the 18 inductance, the 20 inductance connects a phase output voltage of described AC output module respectively, the different name end of described the 16 inductance, the different name end of the 18 inductance, the different name end short circuit of the 20 inductance are as the output of described virtual neutral network;
Described the 17 inductance, the 19 inductance, the 21 inductance adopt the delta connection mode.
7. virtual neutral circuit of power factor correction according to claim 2 is characterized in that, when described AC output module output two-phase alternating current is pressed,
Described virtual neutral network comprises: the 22 inductance, the 23 inductance, the 24 inductance, the 25 inductance and two magnetic cores;
Described the 22 inductance and the shared magnetic core of the 23 inductance; Described the 24 inductance and the shared magnetic core of the 25 inductance;
The end of the same name of described the 22 inductance and the different name end of the 24 inductance connect an output voltage mutually of described AC output module respectively, the different name end of described the 22 inductance and the end short circuit of the same name of the 24 inductance are as the output of described virtual neutral network;
The end of the same name of termination the 25 inductance of the same name of described the 23 inductance, the different name end of described the 23 inductance of different name termination of described the 25 inductance.
8. virtual neutral circuit of power factor correction according to claim 2 is characterized in that, when described AC output module output two-phase alternating current is pressed,
Described virtual neutral network comprises: the 26 inductance, the 27 inductance and a magnetic core; Described the 26 inductance and the shared described magnetic core of the 27 inductance;
The end of the same name of described the 26 inductance and the different name end of described the 27 inductance connect an output voltage mutually of described AC output module respectively;
The different name end of described the 26 inductance and the end short circuit of the same name of described the 27 inductance are as the output of described virtual neutral network.
9. according to each described virtual neutral circuit of power factor correction of claim 1 to 8, it is characterized in that described power factor correction unit comprises: rectification circuit and buck-boost circuit;
Described rectification circuit has an input, first output and second output; The input of described rectification circuit connects a cross streams voltage of described AC output module output as the input of described power factor correction unit, is used for the single-phase alternating current that receives is compressed into capable rectification, and exports described buck-boost circuit to;
Described buck-boost circuit has the first input end and second input, connects first output and second output of described rectification circuit respectively; Described buck-boost circuit also has first output, second output and the 3rd output;
The first output short circuit of the buck-boost circuit of each power factor correction unit is as the positive output end of described power factor correction module; The second output short circuit of the buck-boost circuit of each power factor correction unit is as the negative output terminal of described power factor correction module; The 3rd output short circuit of the buck-boost circuit of each power factor correction unit is as the common-midpoint of described power factor correction module;
Described buck-boost circuit is used for the single-phase voltage after the described rectification circuit rectification is carried out buck and power factor correction.
10. virtual neutral circuit of power factor correction according to claim 9 is characterized in that,
Described rectification circuit comprises: first diode and second diode; The negative electrode short circuit of the anode of described first diode and described second diode is as the input of described rectification circuit; The negative electrode of described first diode is as first output of described rectification circuit, and the anode of described second diode is as second output of described rectification circuit;
Perhaps,
Described rectification circuit comprises: first power tube and second power tube; The drain electrode short circuit of the source electrode of described first power tube and second power tube is as the input of described rectification circuit; The drain electrode of described first power tube is as first output of described rectification circuit, and the source electrode of described second power tube is as second output of described rectification circuit.
11. virtual neutral circuit of power factor correction according to claim 9 is characterized in that, described buck-boost circuit comprises:
The drain electrode short circuit of the drain electrode of the 13 switching tube and first switching tube is as the first input end of described buck-boost circuit;
The source electrode of described the 13 switching tube connects the negative electrode of the 8th diode and an end of the one one inductance, and the source electrode of described first switching tube connects the negative electrode of the 7th diode and an end of the one or two inductance;
Behind the other end of described the one one inductance and the other end short circuit of the one or two inductance, connect the drain electrode of the 4th switching tube and the anode of the 11 diode jointly; The negative electrode of described the 11 diode is as first output of described buck-boost circuit;
The source shorted of the source electrode of the 14 switching tube and second switch pipe is as second input of described buck-boost circuit;
The drain electrode of described the 14 switching tube connects the anode of the tenth diode and an end of the one or four inductance, and the drain electrode of described second switch pipe connects the anode of the 9th diode and an end of the one or three inductance; Behind the other end of described the one or four inductance and the other end short circuit of the one or three inductance, connect the source electrode of the 3rd switching tube and the negative electrode of the 12 diode jointly; The anode of described the 12 diode is as second output of described buck-boost circuit;
The drain electrode short circuit of the negative electrode of the negative electrode of the source electrode of the anode of the anode of described the 8th diode, the 7th diode, the 4th switching tube, the 9th diode, the tenth diode and the 3rd switching tube is as the 3rd output of described buck-boost circuit;
First electric capacity also is connected between first output and the 3rd output of described buck-boost circuit; Second electric capacity also is connected between the 3rd output and second output of described buck-boost circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101196383A CN102208813A (en) | 2011-05-10 | 2011-05-10 | Artificial Neutral Point (ANP) power factor correction circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101196383A CN102208813A (en) | 2011-05-10 | 2011-05-10 | Artificial Neutral Point (ANP) power factor correction circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102208813A true CN102208813A (en) | 2011-10-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101196383A Pending CN102208813A (en) | 2011-05-10 | 2011-05-10 | Artificial Neutral Point (ANP) power factor correction circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP2975727A1 (en) * | 2014-07-17 | 2016-01-20 | ABB Technology AG | Three-wire UPS system with artificial neutral |
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| CN101789683A (en) * | 2010-03-03 | 2010-07-28 | 艾默生网络能源有限公司 | Power factor correction circuit |
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| CN1308787A (en) * | 1998-05-06 | 2001-08-15 | 埃默森能源系统有限公司 | Device for creating a neutral point in an electrical system |
| CN1909346A (en) * | 2005-08-04 | 2007-02-07 | 台达电子工业股份有限公司 | Integrated converting means with three-phase activity coefficient adjustment |
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Application publication date: 20111005 |