CN100499345C - Power conversion device using matrix converter - Google Patents
Power conversion device using matrix converter Download PDFInfo
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- CN100499345C CN100499345C CNB2004800206649A CN200480020664A CN100499345C CN 100499345 C CN100499345 C CN 100499345C CN B2004800206649 A CNB2004800206649 A CN B2004800206649A CN 200480020664 A CN200480020664 A CN 200480020664A CN 100499345 C CN100499345 C CN 100499345C
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Abstract
There is provided a power conversion device using a matrix converter capable of reducing the size and weight of the LC filter which should be arranged at the input stage. N matrix converters are connected to a common LC filter. The N matrix converters operate a common load. In this case, a phase difference of the triangular wave signal (carrier signal) used for generating each matrix converter instruction value is set to 360 degrees/N and the common load is driven with the same frequency so that synchronized operation is performed. Thus, it is possible to obtain frequency of the current flowing into the LC filter which is the triangular wave signal(carrier signal) multiplied by N, thereby reducing the load on the LC filter.
Description
Technical field
The present invention relates to a kind of power conversion unit that uses matrix converter, this power conversion unit is exported after the AC power of certain frequency being directly converted to the alternating current of optional frequency.
Background technology
In the employed frequency converter of existing power conversion unit, at first source power supply is transformed into direct current by rectifying device part, export after this direct current being transformed into the alternating current of optional frequency by inverter section then.In this existing frequency converter,, need smmothing capacitor be set at direct current component in order to reduce pulsation.Open in the disclosed existing prior art of flat 3-261376 communique the patent of invention spy of Japan, the triangular signal (carrier signal) of the command value by will being used to generate the rectifying device part becomes 0 to spend with the phase settings of the triangular signal (carrier signal) of the command value that is used to generate inverter section, carry out run-in synchronism, to realize the miniaturization of smmothing capacitor.
On the other hand, open the patent of invention spy of Japan in the disclosed existing power conversion units such as 2001-86751 communique, used source power supply has been directly converted to the matrix converter of exporting behind the alternating current of optional frequency, this power conversion unit also has advantages such as the high order harmonic component that can carry out regenerative power and power supply is lower except not needing to be provided with the smmothing capacitor.
In addition, open flat 10-191642 communique and the patent of invention spy of Japan opens in the disclosed existing matrix converters such as 2000-139076 communique, need between power supply and main circuit, the LC filter be set comprising switch the patent of invention spy of Japan.This LC filter has the such effect of similar bypass capacitor, and it can suppress to flow to from matrix converter the high frequency noise of power supply, and when the switch conduction of main circuit timely supplies charges.
, especially under the bigger situation of the capacity of load, will certainly cause the LC filter to maximize.Thus, one of advantage of matrix converter portion promptly can be omitted the smmothing capacitor of direct current component and can realize that the effect of this advantage of miniaturization and will be weakened greatly.Peculiar problem when this problem is to use matrix converter does not also have to occur the technology relevant with the miniaturization of this LC filter so far.
Open flat 10-191642 communique and the patent of invention spy of Japan opens in the disclosed prior art of 2000-139076 the patent of invention spy of Japan, the installation method with regard to the LC filter does not carry out concrete research.And the reactor of LC filter and capacitor vicinity are provided with., when the distribution length between the capacitor of LC filter and the main circuit switch part was long, the inductance value of distribution rose, and during the each ON/OFF of switch element, all can produce overvoltage on switch element.In order to suppress this overvoltage, in existing circuit, be provided with the buffer circuit that constitutes by diode, capacitor and resistance.
Summary of the invention
First purpose of the present invention is to provide a kind of power conversion unit, and this power conversion unit uses a kind of matrix converter that can realize LC filter miniaturization and.
Second purpose of the present invention is to provide a kind of matrix converter system, and this matrix converter system can suppress described overcurrent, realize the miniaturization or the cancellation buffer circuit of buffer circuit.
In first invention that realizes the present invention's first purpose, N platform matrix converter is connected on the common LC filter.And, drive common load by N platform matrix converter.At this moment, the phase difference that will be used to generate the triangular signal (carrier signal) of each matrix converter command value is set at 360 °/N, drives to carry out run-in synchronism with identical frequency.Thus, the frequency that flows into the electric current of LC filter equals N times of triangular signal (carrier signal), thereby can alleviate the burden of LC filter.
According to the present invention, in the power conversion unit that uses matrix converter, can carry out miniaturization and to the LC filter that is connected the matrix converter input side.Especially, the capacity of matrix converter is big more, and above-mentioned effect is just obvious more.
In second invention that realizes the present invention's second purpose, the installation method of LC filter is studied, the capacitor and the distance between the switch element of LC filter are arranged to less than the reactor of LC filter and the distance between the capacitor.Especially, in jumbo system etc., for example be separated to be arranged in the system of the modular construction in each output mutually at the employing switch element, the capacitor of the LC filter mode with mutual vicinity separately is arranged in each assembly, perhaps the capacitor of low capacity is arranged on switch element near.As mentioned above, by the capacitor of reduction LC filter and the distribution inductance between the switch element, replace buffer circuit with filter.
According to the present invention, in the matrix converter system, have and can suppress to produce on the switch element overvoltage, realize the miniaturization of buffer circuit, perhaps cancel the effect of buffer circuit.
Description of drawings
Fig. 1 is the structure chart of first embodiment of first invention of expression.
Fig. 2 is the command value of first matrix converter in the invention and the skeleton diagram that flows into the electric current of LC filter from matrix converter.
Fig. 3 is the present invention and the comparison diagram of prior art aspect the condenser voltage of LC filter.
Fig. 4 is the present invention and the comparison diagram of prior art aspect the reactor magnetic flux of LC filter.
Fig. 5 is the structure chart of the control circuit among first embodiment.
Fig. 6 is the structure chart of another structure 1 of the control circuit among expression first embodiment.
Fig. 7 is the structure chart of another structure 2 of the control circuit among expression first embodiment.
Fig. 8 represents the matrix converter part among first embodiment.
Fig. 9 represents bidirectional switch.
Figure 10 represents the second embodiment of the present invention.
Figure 11 is the structure chart of the switches set structure among expression second embodiment.
Figure 12 is the illustration figure of another installation method of the LC filter among expression first embodiment.
Figure 13 is the structure chart of first embodiment of second invention of expression.
Figure 14 is the fitting arrangement of existing system.
Figure 15 is the circuit diagram of existing system.
Figure 16 is the circuit diagram of first embodiment of second invention.
Figure 17 is the structure chart of second embodiment of second invention.
Figure 18 represents bidirectional switch.
Figure 19 is the fitting arrangement of first embodiment of second invention.
Figure 20 is the structure chart of the 3rd embodiment of second invention.
Figure 21 is the structure chart of the 4th embodiment of second invention.
Embodiment
Below referring to figs. 1 through Figure 12 first working of an invention form described.
Fig. 1 is the power conversion unit of the use matrix converter of first embodiment of the invention, and this power conversion unit is by source power supply 1, motor 2, LC filter 3, matrix converter 1 (4A), the matrix converter 2 (4B) as load and control circuit 5 formations that are used to drive described matrix converter 4A, 4B.In addition, i1 represents to flow into from matrix converter 1 (4A) electric current of LC filter 3, and i2 represents to flow into from matrix converter 2 (4B) electric current of LC filter 3.In existing changer system, at first source power supply is transformed into direct current, and then converts the alternating current of optional frequency through inverter to by rectifier.At this moment, the direct current for the stable DC part need be provided with smmothing capacitor between rectifier and inverter.In contrast to this, the alternating current of the matrix converter of Fig. 1 certain frequency that source power supply 1 is provided is directly converted to the alternating current of optional frequency.In matrix converter,, be essential smmothing capacitor so can cancel to existing converter owing to do not need source power supply is transformed into direct current.Thus, miniaturization that not only can implement device, and owing to do not need to regularly replace capacitor, so can reduce the intensity of maintenance work significantly.In addition, also have and can carry out electric power regeneration, and the effect that reduces power high-order harmonic generation.
In the system that uses matrix converter, LC filter 3 must be set.LC filter 3 can play the such effect of similar bypass capacitor, not only can remove the high frequency noise that flows to power supply 1 from matrix converter 4A, 4B, but also can be at the electric charge of supply in a flash of matrix converter 4A, the switching of 4B switch.For this reason, desirable method is to make the setting of LC filter next-door neighbour matrix converter.
Fig. 2 is at the command value of the matrix converter of the present invention of any phase and the skeleton diagram that flows into the electric current of LC filter from matrix converter.The command value of matrix converter, the same with the command voltage of existing inverter, by relatively triangular wave and command value generate.That is, as shown in Figure 2, relatively triangular wave and command value if triangular wave is big, are then exported the command value that makes switch conduction.In the present invention, the phase difference of the command value of the triangular signal separately (carrier signal) of matrix converter 1 (4A) and matrix converter 2 (4B) is set to 180 degree.Its result, the command value of the matrix converter of being exported 1 and the Continuity signal of matrix converter 2 have the phase difference of 180 degree, and flow into the current i 1 of LC filter and the phase difference that i2 also has 180 degree from each matrix converter.At this moment, the electric current in the LC filter is i1 and is sum.At this, the cycle that flows into the electric current of LC filter equal triangular signal (carrier signal) period T s 1/2nd.When promptly equaling the action of matrix converter 1/2nd of (for example cycle of i1).In addition, if N platform matrix converter is arranged, according to the principle identical with Fig. 2, the cycle of electric current equals the 1/N of the period T s of triangular signal (carrier signal).The effect that the LC filter is produced when so shortening about the cycle describes with reference to Fig. 3 and Fig. 4.
Fig. 3 compares the present invention and existing mode with regard to the voltage aspect of the capacitor of LC filter 3.The voltage of capacitor discharge and recharge at every turn Shi Junhui repeat the pulsation.The cycle of this pulsation is by the cycle decision of the electric current of inflow and outflow.That is, as shown in Figure 3, the cycle is short more, and then the amplitude of mains ripple is more little, so have the effect that reduces the capacitor burden.Since the present invention than existing cycle of electric current shorter, so have the effect that can further reduce condenser capacity.And, since capacitor can be arranged on matrix converter near, so the distribution inductance between the switch element in can reducing from capacitor to matrix converter has the effect that the overvoltage in the time of can suppressing switch takes place.In addition, owing to can dwindle capacitor volume, thus can as shown in Figure 12 capacitor separately be arranged on each matrix converter, so can improve the degree of freedom of installation aspect.
Fig. 4 compares the present invention and existing mode with regard to the reactor magnetic flux aspect of LC filter 3.The magnetic flux of reactor is also the same with capacitor to be increased and decreased along with the variation of current cycle.That is, as shown in Figure 4, because the cycle is short more, magnetic flux is just more little, diminishes so magnetically saturated possibility occurs, therefore also has the effect that can alleviate the reactor burden.Since the present invention than existing cycle of electric current shorter, so have the effect that can dwindle reactor.In addition, aspect the effect of noise filter, when capacitor and reactor all diminished, the threshold frequency of LC filter (cut-off frequency) presents increased tendency.In general matrix converter, the threshold frequency of LC filter is arranged between the switching frequency of the frequency of source power supply and matrix converter.In contrast to this, in mode of the present invention, because power frequency itself also increases to N doubly, so even capacitor and reactor diminish, frequency that also can be by threshold frequency being arranged on source power supply and N doubly between the frequency of the switching frequency of matrix converter, keep the effect as noise filter of LC filter.
Fig. 5 represents the structure of the control circuit 5 among first embodiment.Control circuit 5 is made of the command value generative circuit 51A of triangular wave generating circuit 50, matrix converter 1 and the command value generative circuit 51B of matrix converter 2.The inside of triangular wave generating circuit 50 has the triangular wave that timer etc., output are used for generator matrix formula frequency converter command value.The command value generative circuit 51B of the command value generative circuit 51A of matrix converter 1 and matrix converter 2 is connected with the current sensing means of not shown matrix converter, generate command value according to these information, by comparing, generate the ON and the OFF signal of the switch element of each matrix converter with triangular signal (carrier signal) from triangular wave generating circuit shown in Figure 2 50.The command value generative circuit 51B of the command value generative circuit 51A of this matrix converter 1 and matrix converter 2 is made of microcomputer etc.And, be provided with negative circuit 52 between any one among the command value generative circuit 51B of the command value generative circuit 51A of matrix converter 1 and matrix converter 2 and the triangular wave generating circuit 50, make triangular wave anti-phase, thereby realize the phase difference of 180 degree.
Fig. 6 represents another structure 1 of the control circuit 5 among first embodiment.Same as shown in Figure 5, the command value generative circuit 51B of the command value generative circuit 51A of matrix converter 1 and matrix converter 2 is connected with the current sensing means of not shown matrix converter.And be constituted as by one of them circuit and generate triangular wave, and this information is sent to another circuit.In another circuit, generate triangular wave according to the triangular wave information that receives with 180 degree phase differences, and the ON and the OFF signal of the switch element of generator matrix formula frequency converter in view of the above.According to this structure,, has the effect of saving the space and reducing cost owing to there is no need independent triangular wave generating circuit is set.The command value generative circuit 51B of the command value generative circuit 51A of this matrix converter 1 and matrix converter 2 is made of microcomputer etc.
Fig. 7 represents another structure 2 of the control circuit 5 among first embodiment.By the command value generative circuit 51C of a matrix converter 1, the command value of generator matrix formula frequency converter 1 and matrix converter 2.The command value generative circuit 51C of this matrix converter also is made of high performance microcomputer etc., is used for generating the triangular signal (carrier signal) with 180 degree phase differences in the inside of circuit.According to this structure, owing to only drive, so can suppress the misoperation that may cause dysgenic noise etc. to cause to communication by the command value generative circuit 51C of a matrix converter.
Fig. 8 represents matrix converter part 4A or the 4B of first embodiment.Matrix converter is made of 9 bidirectional switchs 6, by the ON and the OFF of these switches, and the alternating current of output optional frequency.Fig. 9 is the details drawing of bidirectional switch 6, the bidirectional switch that Fig. 9 (a) expression is combined by common IGBT61 and diode 62.Fig. 9 (b) has represented the bidirectional switch that is made of with the reverse blocking device of reverse voltage endurance applicator for example.By using the bidirectional switch of Fig. 9 (a) and Fig. 9 (b), the alternating current from the certain frequency of source power supply can be directly converted to the alternating current of optional frequency.In addition, in Fig. 8,9 bidirectional switchs of matrix converter part are provided with separately, but 9 bidirectional switchs also can all be combined in the assembly to form the device of integral type.In the first embodiment of the present invention, matrix converter adopts mode arranged side by side to connect, and this kind mode especially has good effect in the big occasion of load capacity.
Figure 10 represents the second embodiment of the present invention, and it is made of source power supply 1, motor 2, LC filter 3, matrix converter 7 and control circuit 5 as load.In Figure 10, matrix converter is made of 9 bidirectional switch groups 8.Figure 11 represents the structure of the switches set 8 of second embodiment.Each bidirectional switch group 8 is by being formed by connecting bidirectional switch shown in Figure 96 side by side.In a second embodiment, by the ON and the OFF signal of triangular signal (carrier signal) generation of input basis phase phasic difference 180 separately in 2 bidirectional switchs of bidirectional switch group 8 inside, can obtain the effect identical with first embodiment.
More than form of implementation of the present invention is described, but the present invention is not subjected to the qualification of above-mentioned form of implementation, in the scope that does not change aim of the present invention, can implement various versions.
Followingly second working of an invention form described with reference to Figure 13 to Figure 21.
Figure 13 is the matrix converter system of first embodiment of the invention, and this matrix converter system is made of source power supply II1, LC filter II2, matrix converter main circuit part II3 and load II4.In existing frequency convertor system, at first source power supply is transformed into direct current by rectifier, by inverter this direct current is transformed into the alternating current of optional frequency then.At this moment, the direct current for the stable DC part need be provided with smmothing capacitor between rectifier and inverter.In contrast to this, the matrix converter of Figure 13 will be directly converted to the alternating current of optional frequency from the alternating current of the certain frequency of source power supply II1.In this matrix converter,, be essential smmothing capacitor so can omit for existing frequency converter owing to do not need source power supply is transformed into direct current.For this reason, miniaturization that not only can implement device, and owing to do not need capacitor is regularly replaced, so can reduce the intensity of maintenance work significantly.In addition, also have and can carry out electric power regeneration, and the effect that reduces power high-order harmonic generation.
Figure 18 represents to constitute the bidirectional switch part II31 of matrix converter main circuit II 3.Matrix converter is made of 9 bidirectional switch part II31, by making these bidirectional switch part of O N and OFF, the alternating current of output optional frequency.The bidirectional switch that Figure 18 (a) expression is combined by common IGBT81 and diode I 82.Figure 18 (b) has represented the bidirectional switch that is made of with the reverse blocking device II83 of reverse voltage endurance applicator for example.Make the bidirectional switch ON/OFF of Figure 18 (a) and Figure 18 (b) according to the operation result of not shown control circuit, the alternating current from the certain frequency of source power supply can be directly converted to the alternating current of optional frequency.In addition, in Figure 13,9 bidirectional switchs of matrix converter part are provided with separately respectively, but 9 bidirectional switchs also can all be combined in the assembly to form the device of integral type.
In using the system of matrix converter, must be connected LC filter II 2 between power supply II 1 and the matrix converter main circuit part II3.This LC filter II 2 is made of with capacitor II22 with reactor II21 and LC filter the LC filter, this LC filter II2 has played the effect of similar bypass capacitor, not only can remove the high frequency noise that flows to power supply II 1 from matrix converter main circuit part II 3, but also can be at the electric charge of supply in a flash of matrix converter main circuit part II 3 switches switching.At this, by setting the value of reactor and capacitor, and become frequency between the switching frequency of the commercial frequency that is in power supply II1 and bidirectional switch part II31 by the resonance frequency of the capacitor decision of the reactor II21 of LC filter and LC filter.Especially property settings can removed on the frequency range of switching frequency component of bidirectional switch part II31.For example, in the system that the switching frequency with 10KHz drives,, make resonance frequency become 1KHz by the value of reactor and capacitor is set.
Figure 14 is the fitting arrangement of existing matrix converter system, and LC filter II2 and matrix converter main circuit part II3 are arranged on the inside of device dish II5.At this, because the LC filter is heavier with the weight of reactor II21, so operated by rotary motion is in the bottom of device dish II5, and bottom the LC filter also is arranged in company with it together with capacitor II22.The influence of the matrix converter system of relevant this moment is elaborated with reference to Figure 15.
Figure 15 is the detailed circuit diagram of existing matrix converter system.Shown in Fig. 1 I2, LC filter II2 is arranged on the bottom of device dish II5, have at interval if produce between itself and the matrix converter main circuit part II3, the LC filter then can become and can not ignore with the distribution inductance II6 of the distribution between capacitor II22 and the matrix converter main circuit part II3.If II6 is big for the distribution inductance, then during the each ON/OFF of bidirectional switch part II31 in matrix converter main circuit part II3, all can produce overvoltage among the bidirectional switch part II31.This is that the electric current that flows through wired electric sensor II6 can be blocked because switch is when the ON state switches to the OFF state, so the energy of savings in distribution inductance II6 can the increase that is in proportion of this overvoltage and distribution inductance II6 occur with the form of voltage.When this voltage surpasses the withstand voltage limit of switch element, may cause component wear.For this overvoltage is compensated, be provided with buffer circuit II7 in the existing matrix converter.That is, the energy of wired electric sensor II6 is put aside in the capacitor of buffer circuit II7,, occurred overvoltage on the element to be suppressed at by this energy of resistance consumption., this buffer circuit 7 not only can cause the volume of device to increase, and owing to need react immediately, so need diode at a high speed, therefore will certainly cause cost to increase.
For this reason, in the present invention, as shown in figure 13, when the LC filter is set with capacitor II22, with the LC filter with the distance A between capacitor II22 and the matrix converter main circuit part II3 be arranged to less than between LC filter usefulness reactor 21 and the LC filter usefulness capacitor II22 apart from B.Figure 16 is the detailed circuit diagram of matrix converter of the present invention system.By shortening the LC filter, reduce the distribution inductance in above-mentioned interval, thereby can suppress to produce in the switch element overvoltage with the distance between capacitor II22 and the matrix converter main circuit part II3.That is, capacitor by reducing the LC filter as much as possible and the distribution inductance II6 between the matrix converter main circuit part II3 replace buffer circuit with the LC filter, can dwindle the scale of existing buffer circuit or omit this buffer circuit.At this moment, the LC filter increases with the distribution impedance II6 between the capacitor II22 with reactor 21 and LC filter, can produce fluctuation with reactor 21 and LC filter with the filter constants that capacitor II22 determines by the LC filter, but because the recruitment of distribution impedance II6 is very little with reactor 21 with respect to the LC filter, so the amplitude of fluctuation can be controlled at certain limit and can not produce harmful effect.In addition, the mounting arrangements of this moment as shown in figure 19, the heavier LC filter of weight is arranged on the bottom of device dish II5 with reactor II21, and the LC filter it is desirable to be close to matrix converter main circuit part II3 setting with capacitor II22.And, when mounted, impartial substantially by the LC filter is arranged to the distance between each bidirectional switch part 31 in capacitor II22 and the matrix converter main circuit part II3, can make each this equalization of wired electric sensillary base, so have the effect that can access stable operating characteristics.
Figure 17 represents the matrix converter system in the second embodiment of the invention.Second embodiment is identical with first embodiment, it is illustrated in for example is arranged to the LC filter to use reactor 21 and LC filter with under the condition apart from B between the capacitor II22 less than the LC filter with the distance A between capacitor II22 and the matrix converter main circuit part II3, the LC filter separately is arranged on each output phase (U phase with capacitor II22, the V phase, the W phase) in.According to this structure, though the quantity of capacitor II22 increases, the volume of each capacitor dwindles.Especially, in the big matrix converter system of output capacity, bidirectional switch part II31 adopts the form of assembly to be arranged in each output mutually basically, so, its as a result capacitor II22 be set in each assembly, like this, not only it is improved with each balance (symmetry) between mutually, and after each capacitor miniaturization, make installation exercise become more convenient.And, because can be provided with very for a short time with the distance between capacitor II22 and the matrix converter main circuit part II3 LC filter this moment, therefore have the distribution inductance that can reduce above-mentioned interval, can suppress to produce on the switch element superpotential effect thereby have.
In addition, second embodiment is also identical with first embodiment, the LC filter increases with the distribution inductance II6 between the capacitor II22 with reactor 21 and LC filter, can produce fluctuation with reactor 21 and LC filter with the filter constants that capacitor II22 determines by the LC filter, but because the recruitment of distribution inductance II6 is very little with reactor 21 with respect to the LC filter, so the amplitude of fluctuation can be controlled at certain limit and can not produce harmful effect.
Figure 20 represents the matrix converter system of third embodiment of the invention.In the 3rd embodiment, the LC filter is arranged with capacitor II22 branch, bigger capacitor II221 next-door neighbour's reactor (bottom of device dish) is provided with, and less capacitor II222 next-door neighbour matrix converter main circuit part II3 is provided with.According to this structure, can when switch OFF, make less capacitor II222 absorb the energy of savings in the distribution inductance, can suppress to produce in the switch element superpotential effect thereby have.In addition, the volume of the capacitor II222 that next-door neighbour's matrix converter main circuit part II3 is provided with diminishes, thereby makes installment work become more convenient.
Figure 21 represents the matrix converter system of fourth embodiment of the invention.The 4th embodiment is identical with the 3rd embodiment, the LC filter is divided with capacitor II22 be arranged, and capacitor II221 next-door neighbour's reactor (bottom of device dish) that will be bigger is provided with.And less capacitor II222 is identical with second embodiment, separately is arranged in each output phase (U phase, V phase, W phase).According to this structure, identical with second embodiment, in matrix converter capacious system, capacitor II222 is installed in each assembly, like this, not only it is improved with each balance (symmetry) between mutually, and after each capacitor miniaturization, makes installation exercise become more convenient.
In the 3rd embodiment and the 4th embodiment, adopted the part that distribution inductance etc. is not had current source character to be arranged on the mains side of matrix converter main circuit part II3, and the part that capacitor II222 etc. has voltage source character has been arranged on the structure on the mains side of matrix converter main circuit part II3.That is, the size of capacitor II222 only need be arranged on the overvoltage that produced by distribution inductance II6 than just can in the enough little scope of the withstand voltage of switch element.In this, even the size of capacitor II222 is very little, for example make ratio between capacitor II221 and the capacitor II222 be set at 8: 2 or 9: 1 also no problem.
More than form of implementation of the present invention is described, but the present invention is not subjected to the qualification of above-mentioned form of implementation, in the scope that does not change aim of the present invention, can implement various versions.
Application aspect industry
According to first invention, has following effect, namely at the power conversion that uses matrix converter In the device, can carry out small-size light-weight to the LC wave filter that is connected matrix converter input side Change. Especially, the capacity of matrix converter is more big, and above-mentioned effect is just more obvious.
According to second invention, have following effect, namely can suppress the switch unit of matrix converter Produce overvoltage on the part, realize the miniaturization of the buffer circuit that element protection is used, perhaps cancel this buffering Circuit.
Claims (15)
1. power conversion unit that uses matrix converter, have many above matrix converters of a plurality of N platforms and the LC filter that constitutes by reactor and capacitor, the bidirectional switch assembly that this matrix converter possesses a plurality of bidirectional switchs at least or is made of described bidirectional switch, and has a function that the power conversion of certain frequency is become the variable ratio frequency changer alternating current, it is characterized in that
Many matrix converters more than the described N platform are connected in parallel on the back segment of described LC filter, and make the above matrix converter of described N platform carry out run-in synchronism, to drive common load with identical frequency;
The triangular signal that is used to generate each matrix converter command value is that the phase difference of carrier signal is 360 °/N.
2. power conversion unit that uses matrix converter, have above many table apparatus that are used for matrix converter of N platform and the LC filter that constitutes by reactor and capacitor, wherein the above many table apparatus of this N platform have an assembly that is combined by 9 bidirectional switchs at least, it is characterized in that
Many matrix converters more than the described N platform are connected in parallel on the back segment of described LC filter, and make the above matrix converter of described N platform carry out run-in synchronism, to drive common load with identical frequency;
The triangular signal that is used to generate the command value that sends to each device is that the phase difference of carrier signal is 360 °/N.
3. the power conversion unit of use matrix converter according to claim 1 and 2 is characterized in that,
The platform number of matrix converter is 2, the control circuit that is used for generator matrix formula frequency converter command value is provided with a triangular wave generating circuit and two matrix converter command generating circuits, is provided with negative circuit between wherein any one and the described triangular wave generating circuit of described two matrix converters with command generating circuit.
4. the power conversion unit of use matrix converter according to claim 1 and 2 is characterized in that,
The platform number of matrix converter is 2, the control circuit that is used for generator matrix formula frequency converter command value is provided with two matrix converter command generating circuits, and be provided with a generation triangular wave that makes in described two matrix converters usefulness command generating circuit, and this information is sent to the mechanism of another matrix converter with command generating circuit.
5. the power conversion unit of use matrix converter according to claim 1 and 2 is characterized in that,
The platform number of matrix converter is 2, be provided with the matrix converter command generating circuit of being made up of a microcomputer in the control circuit of generator matrix formula frequency converter command value, this matrix converter is used to generate the command value of 2 matrix converters with command generating circuit.
6. the power conversion unit of use matrix converter according to claim 1 is characterized in that,
The cut-off frequency of LC filter is in supply frequency and N doubly between the frequency of matrix converter switching frequency.
7. the power conversion unit of use matrix converter according to claim 1 is characterized in that, the capacitor of LC filter disperse to be arranged on described matrix converter near.
8. power conversion unit that uses matrix converter, this power conversion unit have the matrix converter that is made of 9 bidirectional switch group at least and by the LC filter that reactor and capacitor constitute, it is characterized in that,
Described bidirectional switch group is connected in parallel by the individual bidirectional switch of N of respectively doing for oneself and forms, and connects described matrix converter at the back segment of described LC filter, and carries out run-in synchronism with identical frequency, to drive common load;
The phase difference of employed triangular signal carrier signal was 360 °/N when generation sent to the command value of N the bidirectional switch that comprises in each bidirectional switch group.
9. matrix converter system, at least LC filter of being made up of main circuit part, reactor and capacitor and the load that is partly driven by described main circuit constitute, the bidirectional switch assembly that wherein said main circuit partly has a plurality of bidirectional switchs or is made of described bidirectional switch, described main circuit partly has the function that the Power Conversion from the certain frequency of power supply is become the power of variable frequency, it is characterized in that
According to the mode of the distance between the capacitor of described LC filter and the described main circuit part being arranged to less than the distance between the capacitor of the reactor of described LC filter and described LC filter, the capacitor of LC filter is set.
10. matrix converter according to claim 9 system is characterized in that, the LC filter, and its property settings constitutes in the frequency range with the switching frequency component of switch element removing described matrix converter.
11., it is characterized in that the capacitor branch of LC filter is arranged according to claim 9 or 10 described matrix converter systems.
12., it is characterized in that, the capacitor of LC filter is cut apart, and the capacitor after will cutting apart is arranged in each assembly that constitutes described main circuit part according to claim 9 or 10 described matrix converter systems.
13. according to claim 9 or 10 described matrix converter systems, it is characterized in that,
Make the capacitor and the distance between each bidirectional switch in the described main circuit part of described LC filter impartial substantially during installation.
14. matrix converter according to claim 9 system is characterized in that,
Described main circuit partly is arranged on the inside of same device dish with described LC filter,
The reactor of described LC filter is arranged on the bottom of described device dish, and the capacitor of described LC filter is close to described main circuit and partly is provided with.
15. matrix converter according to claim 11 system is characterized in that, the capacitor that capacity is little in the capacitor after cutting apart be arranged on described main circuit part near.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP207238/2003 | 2003-08-12 | ||
| JP2003207238A JP4385672B2 (en) | 2003-08-12 | 2003-08-12 | Power converter using matrix converter |
| JP207239/2003 | 2003-08-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1823466A CN1823466A (en) | 2006-08-23 |
| CN100499345C true CN100499345C (en) | 2009-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800206649A Expired - Fee Related CN100499345C (en) | 2003-08-12 | 2004-05-17 | Power conversion device using matrix converter |
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| Country | Link |
|---|---|
| JP (1) | JP4385672B2 (en) |
| CN (1) | CN100499345C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103597726A (en) * | 2011-05-31 | 2014-02-19 | 日产自动车株式会社 | Power converter |
| CN103597727A (en) * | 2011-05-31 | 2014-02-19 | 日产自动车株式会社 | Power conversion device |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7768228B2 (en) * | 2007-09-12 | 2010-08-03 | Gm Global Technology Operations, Inc. | Method and system for converting DC power to AC power |
| JP4390010B1 (en) | 2008-07-01 | 2009-12-24 | ダイキン工業株式会社 | Direct form converter and control method thereof |
| PL2328264T3 (en) * | 2009-09-29 | 2012-09-28 | Abb Schweiz Ag | Cycloconverter and system with such a cycloconverter |
| JP5494304B2 (en) * | 2010-07-08 | 2014-05-14 | 富士電機株式会社 | Power conditioner |
| CN102185490B (en) * | 2011-05-20 | 2013-07-03 | 上海交通大学 | Medium-voltage frequency converter capable of realizing AC-AC (alternating-current) direct transformation |
| JP5437313B2 (en) * | 2011-05-31 | 2014-03-12 | 日産自動車株式会社 | Power converter |
| WO2013051476A1 (en) * | 2011-10-07 | 2013-04-11 | 日産自動車株式会社 | Power converter |
| JP5533945B2 (en) | 2012-06-15 | 2014-06-25 | 株式会社安川電機 | Power converter |
| CN104716858B (en) * | 2015-03-13 | 2017-11-14 | 湖州师范学院 | The full-bridge grid-connected inverter circuit of no current ripple |
-
2003
- 2003-08-12 JP JP2003207238A patent/JP4385672B2/en not_active Expired - Fee Related
-
2004
- 2004-05-17 CN CNB2004800206649A patent/CN100499345C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103597726A (en) * | 2011-05-31 | 2014-02-19 | 日产自动车株式会社 | Power converter |
| CN103597727A (en) * | 2011-05-31 | 2014-02-19 | 日产自动车株式会社 | Power conversion device |
| CN103597726B (en) * | 2011-05-31 | 2016-01-13 | 日产自动车株式会社 | Power-converting device |
| CN103597727B (en) * | 2011-05-31 | 2016-02-17 | 日产自动车株式会社 | Power-converting device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1823466A (en) | 2006-08-23 |
| JP4385672B2 (en) | 2009-12-16 |
| JP2005065356A (en) | 2005-03-10 |
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