CN104935186B - Rectified three-phase circuit and there is its air conditioner - Google Patents
Rectified three-phase circuit and there is its air conditioner Download PDFInfo
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- CN104935186B CN104935186B CN201410099114.6A CN201410099114A CN104935186B CN 104935186 B CN104935186 B CN 104935186B CN 201410099114 A CN201410099114 A CN 201410099114A CN 104935186 B CN104935186 B CN 104935186B
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Abstract
The invention discloses a kind of rectified three-phase circuit, and it includes：Rectifier, rectifier carry out rectification to export the direct current of the direct current of first voltage and second voltage to three-phase alternating current；First wave filter, the first wave filter are connected with rectifier, and the first wave filter is filtered processing to the direct current of first voltage；DC DC modular converters, DC DC modular converters include transformer and switching device, the armature winding of transformer is connected with switching device, DC output end of the secondary windings of transformer as DC DC modular converters, DC DC modular converters are converted to the direct current of the first voltage after filtering process in the direct current of tertiary voltage, and are exported by DC output end.The rectified three-phase circuit of the present invention is ingenious in design, and multiple power sources function can be achieved in one, can both save the work of hardware design, save the space of fabric swatch design, can also reduce the cost of hardware design of circuit.The invention also discloses a kind of air conditioner.
Description
Technical field
The present invention relates to converter technique field, more particularly to a kind of rectified three-phase circuit and there is the rectified three-phase circuit
Air conditioner.
Background technology
In recent years, advancing by leaps and bounds with converter technique, the application of converter technique also become more and more extensive.But becoming
In frequency control technology, the driving power required for various control units is a problem for needing to solve.Due to required electricity
Source is more, and voltage range is wide, such as the DC voltage of the scope from DC1.8V to DC24V is required for, and so solves Width funtion DC-DC
Converter just turns into a pressing issues.
Or but in correlation technique drive circuit power supply using transformer scheme, or the side using Switching Power Supply
Case, this just needs to increase a large amount of hardware circuits, so as to can not only influence the space of fabric swatch design, can also increase extra cost,
And the reliability of whole circuit is also poor, therefore, it is necessary to is improved.
The content of the invention
The purpose of the present invention is intended at least solve above-mentioned technological deficiency.
Therefore, it is an object of the present invention to propose it is a kind of can realize multiple power sources function in one three phase rectifier
Circuit.
It is another object of the present invention to propose a kind of air conditioner.
To reach above-mentioned purpose, a kind of rectified three-phase circuit that one aspect of the present invention embodiment proposes, including：Rectifier,
The input of the rectifier is electrically connected with three-phase alternating current, and the rectifier carries out rectification to the three-phase alternating current to export the
The direct current of one voltage and the direct current of second voltage；First wave filter, first wave filter are connected with the rectifier, institute
State the first wave filter and processing is filtered to the direct current of the first voltage；DC-DC modular converters, the DC-DC moduluss of conversion
Block is connected with first wave filter, and the DC-DC modular converters include transformer and switching device, the transformer just
Level winding is connected with the switching device, the direct current output of the secondary windings of the transformer as the DC-DC modular converters
End, the DC-DC modular converters are converted to the direct current of the first voltage after filtering process in the direct current of tertiary voltage, and lead to
The DC output end is crossed to be exported, wherein, the first voltage is more than the tertiary voltage.
Rectified three-phase circuit according to embodiments of the present invention, rectifier to three-phase alternating current by carrying out rectification to export the
The direct current of one voltage and the direct current of second voltage, the direct current of first voltage after being handled by the first filter filtering,
Convert thereof into the direct currents of other voltages by DC-DC modular converters needs the part of small voltage direct current to supply.Therefore, originally
The rectified three-phase circuit of inventive embodiments is ingenious in design, and multiple power sources function can be achieved in one, can both save hardware and set
The work of meter, the space of fabric swatch design is saved, can also realize and save multiple switch power circuit, so as to greatly extend it
Application, the circuit design of engineer is facilitated, while the cost of hardware design of circuit can also be greatly reduced.Additionally due to
Multiple switch power supply can be saved, improves the stability and reliability of circuit, substantially improves the EMC designs of total system.
According to one embodiment of present invention, the rectifier is three-phase commutation bridge.
Also, the three-phase commutation bridge includes：The first diode and the second diode of series connection, the 1st of the series connection the
There is first node, the first node is connected with the A phase output terminals of the three-phase alternating current between pole pipe and the second diode；
Series connection the 3rd diode and the 4th diode, the 3rd diode and the 4th diode of the series connection with it is described connect first
Diode and the second diodes in parallel, and there is section point between the 3rd diode of the series connection and the 4th diode, institute
Section point is stated with the B phase output terminals of the three-phase alternating current to be connected；The 5th diode and the 6th diode of series connection, the string
The 5th diode and the 6th diode and the 3rd diode and the 4th diodes in parallel connected of connection, and the series connection
There is the 3rd node, the C phases of the 3rd node and the three-phase alternating current export between 5th diode and the 6th diode
End is connected；Wherein, after the negative electrode of first diode, the negative electrode of the 3rd diode are connected with the negative electrode of the 5th diode
As the first output end of the three-phase commutation bridge, the anode of second diode, the anode of the 4th diode and described
The second output end after the anode of six diodes is connected as the three-phase commutation bridge, the neutral point conduct of the three-phase alternating current
3rd output end of the three-phase commutation bridge.
According to one embodiment of present invention, first wave filter includes the first inductance and the first electric capacity of series connection.
According to one embodiment of present invention, one end of first inductance is connected with first output end, and described
One end of one electric capacity is connected with the other end of first inductance, the other end of first electric capacity and the 3rd output end phase
It is grounded after even, wherein, first output end exports the direct current of the first voltage with the 3rd output end.
According to another embodiment of the invention, one end of first inductance is connected with the 3rd output end and is followed by
Ground, one end of first electric capacity are connected with the other end of first inductance, the other end of first electric capacity and described the
Two output ends are connected, wherein, second output end exports the direct current of the first voltage with the 3rd output end.
According to still a further embodiment, one end of first inductance is connected with second output end, described
One end of first electric capacity is connected with the other end of first inductance, the other end of first electric capacity and the 3rd output end
It is grounded after being connected, wherein, second output end exports the direct current of the first voltage with the 3rd output end.
According to one embodiment of present invention, described rectified three-phase circuit also includes the second wave filter, second filter
Ripple device is filtered processing to the direct current of the second voltage, and second wave filter includes：Second inductance, described
One end of two inductance is connected with first output end；The second electric capacity and the 3rd electric capacity of series connection, one end of second electric capacity
It is connected with the other end of second inductance, the other end of second electric capacity is connected with one end of the 3rd electric capacity, described
The other end of 3rd electric capacity is connected with second output end, has the 4th between the second electric capacity and the 3rd electric capacity of the series connection
Node；The first resistor and second resistance of series connection, the first resistor and second resistance of the series connection and second electricity connected
Hold and the 3rd electric capacity is in parallel, one end of the first resistor is connected with the other end of second inductance, the first resistor
The other end is connected with one end of the second resistance, and the other end of the second resistance is connected with second output end, described
There is the 5th node, the 5th node is connected with the fourth node between the first resistor and second resistance of series connection.
According to one embodiment of present invention, the switching device is metal oxide layer-semiconductor-field-effect transistor
MOSFET。
According to one embodiment of present invention, the DC-DC modular converters also include：7th diode, the described 7th 2
The anode of pole pipe is connected with one end of the secondary windings of the transformer；4th electric capacity, one end of the 4th electric capacity with it is described
The negative electrode of 7th diode is connected, and the other end of the 4th electric capacity is connected with the other end of the secondary windings of the transformer,
The both ends of 4th electric capacity are as the DC output end.
In addition, another aspect of the present invention embodiment also proposed a kind of air conditioner, it includes above-mentioned rectified three-phase circuit.
Air conditioner according to embodiments of the present invention, above-mentioned rectified three-phase circuit is employed, wherein due to three phase rectifier electricity
Road can realize that multiple power sources function in one, so can both save the work of the hardware circuit design of air conditioner, save cloth
The space of plate design, can also realize and save multiple switch power circuit, greatly reduce cost.Additionally due to three phase rectifier is electric
Road can save multiple switch power supply, so as to improve the stability of air conditioner and reliability.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the circuit diagram according to the rectified three-phase circuit of the embodiment of the present invention；
Fig. 2A is the circuit diagram according to the rectified three-phase circuit of one embodiment of the invention；
Fig. 2 B are the circuit diagram according to the rectified three-phase circuit of another embodiment of the present invention；
Fig. 2 C are the circuit diagram according to the rectified three-phase circuit of further embodiment of the present invention；
Fig. 3 is three-phase voltage Va-N, Vb-N, Vc-N for being observed from neutral point N according to one embodiment of the invention
Voltage curve；
Fig. 4 is the graph of a relation according to the A phase voltage Va and A phase source currents Ia of one embodiment of the invention；
Fig. 5 be according to the three-phase current of the negative direction of one embodiment of the invention and correspondingly negative current phase voltage
Value it is minimum when schematic diagram；
Fig. 6 A are that electric current passes through the flow direction of commutation diode and illustrated at -30 ° to 30 ° according to one embodiment of the invention
Figure；
Fig. 6 B are that electric current is shown by the flow direction of commutation diode at 30 ° to 90 ° according to another embodiment of the present invention
It is intended to；
Fig. 7 is the voltage according to the Vn of one embodiment of the invention（Vn-E）As three-phase voltage minimum value when show
It is intended to；
Voltage curves of the Fig. 8 for the Vp according to one embodiment of the invention for Vn；
Fig. 9 is from neutral point N according to one embodiment of the invention（It is grounded E）The Vp observed（Vp-E）And Vn（Vn-E）
Voltage curve；
Figure 10 is the voltage waveform view according to the Vp observed from Vn of one embodiment of the invention；
Figure 11 is the voltage waveform view that Vp1, Vp2 are observed from neutral point N according to one embodiment of the invention；
Figure 12 is the A phase voltages observed from neutral point N and A phase source current waveforms according to one embodiment of the invention
Schematic diagram；
Figure 13 is the three-phase voltage observed from neutral point N and three phase mains current wave according to one embodiment of the invention
Shape schematic diagram；
Figure 14 is according to the N observed from Vn of one embodiment of the invention and Vp3 waveform diagram；
Figure 15 is the waveform diagram according to the neutral point N of the one embodiment of the invention Vp3 observed and Vn；
Figure 16 is according to the Vn4 observed from neutral point N of one embodiment of the invention and Vn waveform diagram；With
Figure 17 is the waveform diagram according to the neutral point N and Vn that are observed from Vn4 of one embodiment of the invention.
Reference：
Rectifier 10, DC-DC modular converters 20, three-phase DC motor 30, the second wave filter 40, frequency converter 50, the first filter
Ripple device 60；
Three-phase commutation bridge：First diode D1 and the second diode D2, the 3rd diode D3 and the 4th diode D4, the 5th
Diode D5 and the 6th diode D6；
First wave filter 60：First inductance L1, the first electric capacity C1；
Second wave filter 40：Second inductance L2, the second electric capacity C2 and the 3rd electric capacity C3, first resistor R1 and second resistance
R2；
DC-DC modular converters 20：Transformer 201, switching device 202, the 7th diode D7 and the 4th electric capacity C4.
Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
Following disclosure provides many different embodiments or example is used for realizing the different structure of the present invention.For letter
Change disclosure of the invention, hereinafter the part and setting of specific examples are described.Certainly, they are only example, and
Purpose does not lie in the limitation present invention.In addition, the present invention can in different examples repeat reference numerals and/or letter.It is this heavy
It is the relation between itself not indicating discussed various embodiments and/or setting for purposes of simplicity and clarity again.This
Outside, the invention provides various specific techniques and material examples, but those of ordinary skill in the art can be appreciated that
The applicable property of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it
" on " structure can include the first and second features and be formed as the embodiment that directly contacts, other feature shape can also be included
Into the embodiment between the first and second features, such first and second feature may not be direct contact.
In the description of the invention, it is necessary to explanation, unless otherwise prescribed and limit, term " installation ", " connected ",
" connection " should be interpreted broadly, for example, it may be mechanical connection or electrical connection or the connection of two element internals, can
To be to be joined directly together, can also be indirectly connected by intermediary, for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term.
The rectified three-phase circuit that its is proposed according to embodiments of the present invention and whole with the three-phase described with reference to the accompanying drawings
The air conditioner of current circuit.
Fig. 1 is the circuit diagram according to the rectified three-phase circuit of the embodiment of the present invention.As shown in figure 1, the rectified three-phase circuit
Including rectifier 10, the first wave filter 60 and DC-DC modular converters 20.
Wherein, the input of rectifier 10 is electrically connected with three-phase alternating current, and rectifier is used to carry out rectification to three-phase alternating current
To export the direct current of the direct current of first voltage and second voltage, the phase voltage of three-phase alternating current corresponds to the direct current of first voltage
Electricity, the line voltage of three-phase alternating current correspond to the direct current of second voltage, and the direct current of second voltage can supply the three of air conditioner
Phase direct current generator 30.
As shown in figure 1, the first wave filter 60 is connected with rectifier 10, the first wave filter 60 enters to the direct current of first voltage
Row filtering process.DC-DC modular converters 20 are connected with the first wave filter 60, and DC-DC modular converters 20 include the He of transformer 201
Switching device 202, the armature winding of transformer 201 are connected with switching device 202, and the secondary windings of transformer 201 is as DC-DC
The direct current of first voltage after filtering process is converted to by the DC output end of modular converter 20, DC-DC modular converters 20
The direct current of three voltages, and exported by DC output end, wherein, first voltage is more than tertiary voltage.
In one embodiment of the invention, as shown in Figure 2 A, switching device 202 can be MOSFET（Metal-
Oxide-Semiconductor Field-Effect Transistor, metal oxide layer-semiconductor-field-effect transistor）.And
And rectifier 10 can be three-phase commutation bridge.
Specifically, in an embodiment of the present invention, general three-phase alternating current is the line power supply of three-phase 4, three-phase be present
Supply voltage（Va、Vb、Vc）And neutral point（N）, on the other hand, the voltage between phases of three phase mains is that AC380Vrms i.e. three are intersecting
The line voltage of electricity is flowed, if line voltage is carried out into three phase full wave rectification by three-phase commutation bridge, DC voltage obtains 537Vpeak
Such as the direct current of second voltage, three-phase DC motor 30 can be supplied.Meanwhile the phase voltage of three-phase alternating current is single-phase
220Vrms, after so carrying out halfwave rectifier to the phase voltage of three-phase alternating current, the direct current of about DC310V such as first voltages
Electricity, when the switching device in DC/DC modular converters is MOSFET, it can be 600V to 1000V or so that its is pressure-resistant, existing device
It is easily met, therefore the MOSFET that common DC/DC modular converters can be used to use.
Also, the rectified three-phase circuit of the embodiment of the present invention is not need the direct current used in DC/DC modular converters 20
The special commutation diode in source, the three phase full wave rectification diode that can utilize frequency conversion are the diode in three-phase commutation bridge.
In one particular embodiment of the present invention, as shown in Figure 2 A, three-phase commutation bridge 10 includes：One or two pole of series connection
Pipe D1 and the second diode D2, the 3rd diode D3 of series connection and the 4th diode D4, the 5th diode D5 and the 6th of series connection
Diode D6.
Wherein, there is first node J1 between the first diode D1 and the second diode D2 of series connection, first node J1 with
The A phase output terminals of three-phase alternating current are connected, the 3rd diode D3 and the 4th diode D4 of series connection and the first diode connected
D1 and the second diode D2 is in parallel, and has section point J2 between the 3rd diode D3 and the 4th diode D4 to connect, the
Two node J2 are connected with the B phase output terminals of three-phase alternating current, and the 5th diode D5 and the 6th diode D6 of series connection are with connecting
3rd diode D3 and the 4th diode D4 is in parallel, and has the 3rd between the 5th diode D5 and the 6th diode D6 to connect
Node J3, the 3rd node J3 are connected with the C phase output terminals of three-phase alternating current.Also, the first diode D1 negative electrode, the three or two pole
The first output end after pipe D3 negative electrode and the 5th diode D5 negative electrode are connected as three-phase commutation bridge, the second diode D2's
The second output end after the anode of anode, the 4th diode D4 anode and the 6th diode D6 is connected as three-phase commutation bridge,
Threeth output ends of the neutral point N of three-phase alternating current as three-phase commutation bridge.
As shown in Fig. 2A, Fig. 2 B or Fig. 2 C, in an embodiment of the present invention, the first wave filter 60 includes the first electricity of series connection
Feel L1 and the first electric capacity C1.
According to one embodiment of present invention, as shown in Figure 2 A, the first inductance L1 one end is connected with the first output end, the
One electric capacity C1 one end is connected with the first inductance L1 other end, and the first electric capacity C1 other end is connected with the 3rd output end to be followed by
Ground, wherein, the direct current of the first output end and the 3rd output end output first voltage.
According to another embodiment of the invention, as shown in Figure 2 B, the first inductance L1 one end is connected with the 3rd output end
After be grounded, the first electric capacity C1 one end is connected with the first inductance L1 other end, the first electric capacity C1 other end and second output
End is connected, wherein, the direct current of the second output end and the 3rd output end output first voltage.
According to still a further embodiment, as shown in Figure 2 C, the first inductance L1 one end is connected with the second output end,
First electric capacity C1 one end is connected with the first inductance L1 other end, after the first electric capacity C1 other end is connected with the 3rd output end
Ground connection, wherein, the direct current of the second output end and the 3rd output end output first voltage.
Also, in an embodiment of the present invention, as shown in Fig. 2A, Fig. 2 B or Fig. 2 C, above-mentioned rectified three-phase circuit also wraps
The second wave filter 40 is included, the second wave filter 40 is filtered processing to the direct current of second voltage.
Specifically, the second wave filter 40 include the second inductance L2, series connection the second electric capacity C2 and the 3rd electric capacity C3, series connection
First resistor R1 and second resistance R2.Wherein, the second inductance L2 one end is connected with the first output end, the second electric capacity C2 one end
It is connected with the second inductance L2 other end, the second electric capacity C2 other end is connected with the 3rd electric capacity C3 one end, the 3rd electric capacity C3
The other end be connected with the second output end, there is fourth node J4 between the second electric capacity C2 of series connection and the 3rd electric capacity C3；Series connection
First resistor R1 and second resistance R2 and the second electric capacity C2 to connect and the 3rd electric capacity C3 it is in parallel, first resistor R1 one end with
The second inductance L2 other end is connected, and the first resistor R1 other end is connected with second resistance R2 one end, second resistance R2's
The other end is connected with the second output end, has the 5th node J5 between the first resistor R1 and second resistance R2 of series connection, Section five
Point J5 is connected with fourth node J4.
The second wave filter being made up of inductance and electric capacity can filter out the direct current of the second voltage of three-phase commutation bridge output
In ripple harmonic, and first resistor R1 and second resistance R2 play a part of balanced voltage.
In one embodiment of the invention, as shown in Figure 2 A, DC-DC modular converters 20 also include：7th diode D7
With the 4th electric capacity C4.Wherein the 7th diode D7 anode is connected with one end of the secondary windings of transformer 201, the 4th electric capacity C4
One end be connected with the 7th diode D7 negative electrode, the 4th electric capacity C4 other end is another with the secondary windings of transformer 201
End is connected, the DC output end of the 4th electric capacity C4 both ends as DC-DC modular converters 20, to export the direct current of tertiary voltage
Electricity.In the example of the present invention, tertiary voltage can be 1V~30V, can be used as various controls in whole air-conditioner system
The driving power of unit processed.
In addition, in an embodiment of the present invention, as shown in Fig. 2A, Fig. 2 B or Fig. 2 C, first resistor R1 one end and second
The resistance R2 other end is connected by frequency converter 50 with three-phase DC motor 30.
Therefore, in an embodiment of the present invention, the direct current supply of the second voltage of three phase full wave rectification output is being realized
While the three-phase DC motor of air conditioner, the direct current of first voltage is obtained using the three-phase semiwave mode rectification of neutral point,
Then by the frequency changer circuit of air conditioner increase inductance, resistance, DC-DC modular converters come obtain required DC1V~
30V power supply.
Accompanying drawing is just referred again to below carrys out the rectified three-phase circuit of the illustratively embodiment of the present invention to three-phase alternating current progress
The process of rectification.
First, as shown in Figure 2 A, can be from neutral point N（It is grounded E）The three-phase voltage observed（Va、Vb、Vc）, neutral point
N is typically grounded（Earth）.Voltage between phases is line voltage（Va-Vb、Vb-Vc、Vc-Va）When being AC380Vrms, seen from neutral point
It is AC220Vrms if survey, maximum voltage is ± 311Vpeak（Calculated by the ÷ √ 3=220 of formula 380,220 × √ 2=311
Obtain）, it is specific as shown in Figure 3.Also, the track of following whole waveform is with A phase voltages（Va）Phase on the basis of illustrate.
Wherein, Fig. 4 is A phase voltage Va and A phase source currents Ia graph of a relation.As shown in figure 4, A phase source currents Ia is in A
What is flowed through between 30 ° to 150 ° of the phase of phase voltage is that to be flowed through between positive direction electric current, 210 ° to 330 ° is negative direction electric current.
If only counting the negative direction of three-phase current, then flow through between -30 ° to 90 ° and flowed between B phase currents, 90 ° to 210 °
Cross between C phase currents, 210 ° to 330 ° and flow through A phase currents, it is correspondingly, minimum in the value of the voltage of the phase of negative current, such as Fig. 5 institutes
Show.
When B phase negative currents flow through, if the voltage drop for ignoring diode, the value of Vn and B phase voltages is equal, then at this moment
When B phase voltages Vb is magnitude of voltage minimum on three-phase.Wherein, at -30 ° to 30 °, 30 ° to 90 °, electric current passes through rectification two
As shown in Figure 6 A and 6 B, at -30 ° to 30 °, electric current respectively flows through middle bridge arm and the right side of three-phase commutation bridge to the flow direction of pole pipe
Side bridge arm, at 30 ° to 90 °, electric current respectively flows through the left side bridge arm of three-phase commutation bridge and middle bridge arm.
Vn voltage（Vn-E）As three-phase voltage minimum value when schematic diagram it is as shown in Figure 7.Now, Vp for
Vn, it is almost certain value, is 513Vmean, as shown in figure 8, the wherein ÷ π=513Vmean of Vmean=380 × √ 2 × 3.
From the foregoing, it will be observed that from neutral point N（It is grounded E）The Vp observed（Vp-E）And Vn（Vn-E）As shown in figure 9, observed from Vn
The Vp arrived voltage waveform is as shown in Figure 10.
If this voltage（DC513Vmean）When being applied to primary voltage of the DC-DC modular converters as transformer,
The pressure-resistant of the MOSFET that so DC-DC modular converters use needs more than 1000V, and the MOSFET of such high pressure is difficult satisfaction.And
The rectified three-phase circuit of the embodiment of the present invention is then an output end by the use of neutral point as rectifier, to export first voltage
Direct current.
Next explanation neutral point N is the three phase half wave rectification waveform of negative potential, as shown in Figure 2 A, adds L1 and C1
The direct current of first voltage is filtered, observation station adds Vp2.Wherein, from neutral point N observe Vp1 if, then become
Three-phase semiwave waveform, Vp2（Average value）By the formula √ 2 × ÷ (2 × π) of (380V ÷ √ 3) × 3 × √ 3=256.6Vmean come
Calculate, as shown in figure 11.The voltage that transformer in DC-DC modular converters uses for dc source Vp2 average voltage
The pressure-resistant of 256.6Vmean, MOSFET is more than DC600V cans, it is easy to which can meets.
As reference, only DC/DC modular converters action, current waveform and voltage wave when frequency converter stops can be enclosed
Shape.Condition hypothesis are that L1 is that the load of 1H, DC/DC modular converter is 25W.
Wherein, it is as shown in figure 12 from the neutral point N A phase voltages observed and A phase source currents, and seen from neutral point N
The three-phase voltage and three phase mains electric current measured is as shown in figure 13.
Then come illustrate neutral point N be positive potential three phase half wave rectification waveform, as shown in fig. 2 b and fig. 2 c, according to first
The position of inductance L1 insertions is different, can cause the difference of waveform.
Wherein, when the first inductance L1 is connected on neutral point N-terminal side, N and Vp3 waveform that the Vn from this moment is observed are such as
It is on the other hand, as shown in figure 15 from the neutral point N Vp3 observed and Vn waveform shown in Figure 14.As shown in figure 14, seen from Vn
The Vp3 measured voltage operation, voltage are stable certain values.
And when the first inductance L1 is connected on Vn sides, as shown in Figure 2 C, from the neutral point N Vn4 observed and Vn waveform such as
Shown in Figure 16, on the other hand, the neutral point N and Vn that are observed from Vn4 waveform are as shown in figure 17.
In summary, it can be deduced that, the dc source of the rectification circuit of the three-phase semiwave mode of neutral point is make use of, is inserted
It is DC256.6Vmean if inductance, if being not inserted into inductance, maximum voltage is 311Vpeak（220×√2=311Vpeak）.
So, no matter which kind of situation, MOSFET resistance to more than the 600V that is pressed in just meets.
Also, the rectified three-phase circuit of the embodiment of the present invention passes through three-phase commutation bridge, the first wave filter and DC-DC moduluss of conversion
When three-phase alternating current to be converted to block direct current such as DC1V~30V of tertiary voltage, have no effect on three-phase alternating current and be converted to
The direct current of second voltage is powered for three-phase DC motor.
Therefore, rectified three-phase circuit according to embodiments of the present invention, rectifier by three-phase alternating current carry out rectification with
The direct current of first voltage and the direct current of second voltage are exported, the direct current of first voltage is at by the first filter filtering
After reason, converting thereof into the direct currents of other voltages by DC-DC modular converters to supply needs the part of small voltage direct current.Cause
This, the rectified three-phase circuit of the embodiment of the present invention is ingenious in design, and multiple power sources function can be achieved in one, can both save hard
The work of part design, the space of fabric swatch design is saved, can also realize and save multiple switch power circuit, so as to greatly extend
Its application, facilitates the circuit design of engineer, while the cost of hardware design of circuit can also be greatly reduced.In addition
Due to multiple switch power supply can be saved, the stability and reliability of circuit are improved, substantially improves the EMC of total system
（Electro Magnetic Compatibility, Electro Magnetic Compatibility）Design.
In addition, another aspect of the present invention embodiment also proposed a kind of air conditioner, it includes above-mentioned rectified three-phase circuit.
Air conditioner according to embodiments of the present invention, above-mentioned rectified three-phase circuit is employed, wherein due to three phase rectifier electricity
Road can realize that multiple power sources function in one, so can both save the work of the hardware circuit design of air conditioner, save cloth
The space of plate design, can also realize and save multiple switch power circuit, greatly reduce cost.Additionally due to three phase rectifier is electric
Road can save multiple switch power supply, so as to improve the stability of air conditioner and reliability.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of changes, modification can be carried out to these embodiments, replace without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is by appended claims and its equivalent limits.
Claims (10)
- A kind of 1. rectified three-phase circuit, it is characterised in that including：Rectifier, input and the three-phase alternating current of the rectifier are electrically connected, and the rectifier is carried out to the three-phase alternating current Rectification to export the direct current of the direct current of first voltage and second voltage, wherein, the rectifier is by using the three-phase The neutral point of alternating current as an output end, to the phase voltage of the three-phase alternating current carries out halfwave rectifier to obtain described the The direct current of one voltage, while the rectifier to the line voltage of the three-phase alternating current by carrying out full-wave rectification to obtain State the direct current of second voltage；First wave filter, first wave filter are connected with the rectifier, and first wave filter is to the first voltage Direct current is filtered processing；DC-DC modular converters, the DC-DC modular converters are connected with first wave filter, and the DC-DC modular converters bag Include transformer and switching device, the armature winding of the transformer is connected with the switching device, the transformer it is secondary around DC output end of the group as the DC-DC modular converters, the DC-DC modular converters are by the first voltage after filtering process Direct current is converted to the direct current of tertiary voltage, and is exported by the DC output end, wherein, the first voltage is big In the tertiary voltage.
- 2. rectified three-phase circuit as claimed in claim 1, it is characterised in that the rectifier is three-phase commutation bridge.
- 3. rectified three-phase circuit as claimed in claim 2, it is characterised in that the three-phase commutation bridge includes：The first diode and the second diode of series connection, have first between the first diode and the second diode of the series connection Node, the first node are connected with the A phase output terminals of the three-phase alternating current；The 3rd diode and the 4th diode of series connection, the 3rd diode and the 4th diode of the series connection are connected with described First diode and the second diodes in parallel, and there is the second section between the 3rd diode of the series connection and the 4th diode Point, the section point are connected with the B phase output terminals of the three-phase alternating current；The 5th diode and the 6th diode of series connection, the 5th diode and the 6th diode of the series connection are connected with described 3rd diode and the 4th diodes in parallel, and there is Section three between the 5th diode of the series connection and the 6th diode Point, the 3rd node are connected with the C phase output terminals of the three-phase alternating current；Wherein, the negative electrode of first diode, the negative electrode of the 3rd diode are made after being connected with the negative electrode of the 5th diode For the first output end of the three-phase commutation bridge, the anode of second diode, the anode and the described 6th of the 4th diode The second output end after the anode of diode is connected as the three-phase commutation bridge, the neutral point of the three-phase alternating current is as institute State the 3rd output end of three-phase commutation bridge.
- 4. rectified three-phase circuit as claimed in claim 3, it is characterised in that first wave filter includes the first electricity of series connection Sense and the first electric capacity.
- 5. rectified three-phase circuit as claimed in claim 4, it is characterised in that one end of first inductance and described first defeated Go out end be connected, one end of first electric capacity is connected with the other end of first inductance, the other end of first electric capacity and 3rd output end is grounded after being connected, wherein, first output end exports the first voltage with the 3rd output end Direct current.
- 6. rectified three-phase circuit as claimed in claim 4, it is characterised in that one end of first inductance and the described 3rd defeated Go out end be connected after be grounded, one end of first electric capacity is connected with the other end of first inductance, first electric capacity it is another One end is connected with second output end, wherein, second output end exports the first voltage with the 3rd output end Direct current.
- 7. rectified three-phase circuit as claimed in claim 4, it is characterised in that one end of first inductance and described second defeated Go out end be connected, one end of first electric capacity is connected with the other end of first inductance, the other end of first electric capacity and 3rd output end is grounded after being connected, wherein, second output end exports the first voltage with the 3rd output end Direct current.
- 8. rectified three-phase circuit as claimed in claim 3, it is characterised in that also including the second wave filter, second filtering Device is filtered processing to the direct current of the second voltage, and second wave filter includes：Second inductance, one end of second inductance are connected with first output end；The second electric capacity and the 3rd electric capacity of series connection, one end of second electric capacity are connected with the other end of second inductance, institute The other end for stating the second electric capacity is connected with one end of the 3rd electric capacity, the other end of the 3rd electric capacity and the described second output End is connected, and has fourth node between the second electric capacity and the 3rd electric capacity of the series connection；The first resistor and second resistance of series connection, the first resistor and second resistance of the series connection and second electric capacity connected In parallel with the 3rd electric capacity, one end of the first resistor is connected with the other end of second inductance, the first resistor it is another One end is connected with one end of the second resistance, and the other end of the second resistance is connected with second output end, the string There is the 5th node, the 5th node is connected with the fourth node between the first resistor and second resistance of connection.
- 9. rectified three-phase circuit as claimed in claim 1, it is characterised in that the DC-DC modular converters also include：7th diode, the anode of the 7th diode are connected with one end of the secondary windings of the transformer；4th electric capacity, one end of the 4th electric capacity are connected with the negative electrode of the 7th diode, the 4th electric capacity it is another End is connected with the other end of the secondary windings of the transformer, and the both ends of the 4th electric capacity are as the DC output end.
- 10. a kind of air conditioner, it is characterised in that including rectified three-phase circuit as claimed in any one of claims 1-9 wherein.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410099114.6A CN104935186B (en) | 2014-03-17 | 2014-03-17 | Rectified three-phase circuit and there is its air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410099114.6A CN104935186B (en) | 2014-03-17 | 2014-03-17 | Rectified three-phase circuit and there is its air conditioner |
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| CN104935186A CN104935186A (en) | 2015-09-23 |
| CN104935186B true CN104935186B (en) | 2018-01-02 |
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| CN2445508Y (en) * | 2000-09-14 | 2001-08-29 | 李凯 | Variable-voltage rectifying device |
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| CN2117696U (en) * | 1992-03-28 | 1992-09-30 | 朱恩强 | Electronic ballast for fluoescent light |
| US6134126A (en) * | 1998-09-08 | 2000-10-17 | Kabushiki Kaisha Toshiba | Power conversion system |
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| CN104935186A (en) | 2015-09-23 |
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