CN104079195A - Power conversion circuit and power conversion system - Google Patents
Power conversion circuit and power conversion system Download PDFInfo
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- CN104079195A CN104079195A CN201410309235.9A CN201410309235A CN104079195A CN 104079195 A CN104079195 A CN 104079195A CN 201410309235 A CN201410309235 A CN 201410309235A CN 104079195 A CN104079195 A CN 104079195A
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Abstract
The invention provides a power conversion circuit and a power conversion system. The power conversion circuit comprises a first power conversion module, a second power bridge arm and a second coupling inductor. The first power conversion module comprises M first power bridge arms and a first coupling inductor, the M first power bridge arms are connected with a first terminal of the power conversion circuit, the first coupling inductor comprises a first magnetic core and M windings wound on the first magnetic core, and the M windings are connected with the M first power bridge arms respectively and used for being coupled with the M first power bridge arms. The second power bridge arm is connected with the first terminal of the power conversion circuit. The second coupling inductor comprises a second magnetic core, a first winding and a second winding, the first winding and the second winding are wound on the second magnetic core, the first winding is connected with the coupling end of the first coupling inductor, the second winding is connected with the second power bridge arm and used for coupling the second power bridge arm and the first power conversion module, and the coupling end of the second coupling inductor is connected with the second end of the power conversion circuit. The power conversion circuit and the power conversion system can lower the cost of the coupling inductors.
Description
Technical field
The present invention relates to power electronic technology, especially relate to a kind of power conversion circuit and power conversion system.
Background technology
At present, adopt the multi-electrical level inverter of staggered corresponding technology to be used widely.Multi-electrical level inverter comprises a plurality of power brachium pontis in parallel, and a plurality of power brachium pontis pass through a plurality of windings or the coil coupling in coupling inductance, and move with interlace mode.Adopt interleaving technique, both can improve the power grade of multi-electrical level inverter, can reduce again input, output current ripple, can also improve the dynamic response of converter, reduce the volume and the automatic current equalizing of realizing converter of magnetic element in circuit.
Conventionally, coupling inductance requires magnetic circuit to want full symmetric, and when actual production, as multi winding transformer, is difficult to make the magnetic circuit full symmetric of coupling inductance.
Yet, the asymmetric meeting of the magnetic circuit of coupling inductance causes circulation and the ripple current on filter inductance in coupling inductance to increase, while causing coupling inductance work, the changing value of magnetic flux density increases, thereby the inductance (increasing the number of turn or magnetic core sectional area) that requires to use more volume when design, guarantee magnetic core does not occur saturated when work.Like this, cause the cost of coupling inductance to increase.
Summary of the invention
The embodiment of the present invention provides a kind of power conversion circuit and power conversion system, can reduce the cost of coupling inductance.
First aspect, a kind of power conversion circuit is provided, this power conversion circuit comprises: the first power conversion module, the first power conversion module comprises M the first power brachium pontis and the first coupling inductance, M the first power brachium pontis is connected with the first terminal of power conversion circuit, and work in crisscross parallel mode, the first coupling inductance comprises the first magnetic core and is wound on M winding on the first magnetic core, M winding is connected with M the first power brachium pontis respectively, in order to M the first power brachium pontis that be coupled, M is more than or equal to 2 positive integer, the number of turn of M winding is identical, the second power brachium pontis, is connected with the first terminal of power conversion circuit, the second coupling inductance, the second coupling inductance comprises the second magnetic core and is wound on the first winding and the second winding on the second magnetic core, the first winding is connected with the coupled end of the first coupling inductance, the second winding is connected with the second power brachium pontis, in order to the second power brachium pontis and the first power conversion module of being coupled, the coupled end of the second coupling inductance is connected with the second terminal of power conversion circuit, and the first winding is different with the number of turn of the second winding.
In conjunction with first aspect, in the possible implementation of the first, the first magnetic core is an interconnective M cylinder, M winding is wound on respectively on M cylinder, and the coiling direction of M winding is identical, the number of turn of M winding is identical, and the turn ratio of the first winding and the second winding is the ratio of the number of the power brachium pontis that is connected with the first winding of the number of the power brachium pontis that is connected of the second winding.
In conjunction with first aspect, in the possible implementation of the second, this power conversion circuit also comprises: P the 3rd power brachium pontis and P the 3rd coupling inductance, P the 3rd power brachium pontis is connected with the first terminal of power conversion circuit respectively, P the 3rd coupling inductance P the 3rd power brachium pontis that be respectively used to be coupled, the second power brachium pontis and the first power conversion module, wherein, each the 3rd coupling inductance in P the 3rd coupling inductance comprises the tertiary winding and the 4th winding, the number that the turn ratio of the tertiary winding and the 4th winding equals the power brachium pontis that the 4th winding is connected is connected the ratio of the number of power brachium pontis with the tertiary winding, P is more than or equal to 1 positive integer.
In conjunction with the possible implementation of the second, in the third possible implementation, P the 3rd power brachium pontis comprises a 3rd power brachium pontis, is connected with the first terminal of power conversion circuit; P the 3rd coupling inductance comprises the 3rd coupling inductance, the 3rd coupling inductance comprises the tertiary winding and the 4th winding, the tertiary winding is connected with the coupled end of the second coupling inductance, the 4th winding is connected with the 3rd power brachium pontis, in order to the 3rd power brachium pontis that is coupled, the second power brachium pontis and the first power conversion module, wherein, the coupled end of the second coupling inductance is connected with the second terminal of power conversion circuit by the 3rd coupling inductance, and the turn ratio of the tertiary winding and the 4th winding is 1:(M+1).
In conjunction with first aspect, in the 4th kind of possible implementation, this power conversion circuit also comprises: the second power conversion module, the second power conversion module comprises N the 4th power brachium pontis and the 4th coupling inductance, N the 4th power brachium pontis is connected with the first terminal of power conversion circuit, and work in crisscross parallel mode, the 4th coupling inductance comprises the 4th magnetic core and is wound on N winding on the 4th magnetic core, N winding is connected with N the 4th power brachium pontis respectively, for N the 4th power brachium pontis that be coupled, the 5th coupling inductance, comprise the 5th winding and the 6th winding, the second power conversion module and the first power conversion module are used for being coupled, wherein, the 5th winding is connected with the coupled end of the first coupling inductance, the 6th winding is connected with the coupled end of the 4th coupling inductance, the number of turn of M winding is identical, the number of turn of N winding is identical, the turn ratio of the first winding and the second winding is 1:(N+M), the turn ratio of the 5th winding and the 6th winding is N:M, N is more than or equal to 2 integer, the first winding is connected with the coupled end of the first coupling inductance by the 5th coupling inductance.
In conjunction with first aspect or above-mentioned any possible implementation, in the 5th kind of possible implementation, this power conversion circuit also comprises: filter circuit, comprise electric capacity, and filter circuit is connected with the second terminal, for alternating current is carried out to filtering.
In conjunction with the 5th kind of possible implementation, in the 6th kind of possible implementation, filter circuit also comprises filter inductance, the second magnetic core comprises the first magnetic post, the second magnetic post and the 3rd magnetic post, the first winding and the second winding are wound on respectively on the first magnetic post and the second magnetic post, filter inductance is wound on the 3rd magnetic post, and the first winding and the second winding are coupled with filter inductance respectively.
In conjunction with first aspect or above-mentioned any possible implementation, in the 7th kind of possible implementation, power brachium pontis is neutral point clamp type many level brachium pontis or capacitor-clamped many level of type brachium pontis.
Second aspect, a kind of three-phase power converters is provided, this three-phase power converters comprises: three phase power translation circuit, for carry out power conversion between three-phase alternating current point and dc point, wherein every phase power conversion circuit is as the power conversion circuit under any implementation in four kinds of implementations of the first to the of first aspect or first aspect.
In conjunction with second aspect, in the possible implementation of the first, this three-phase power converters also comprises: three-phase filter circuit, comprise three electric capacity, for three-phase alternating current is carried out to filtering, one end of each electric capacity in three electric capacity is connected with the second terminal of a phase power inversion circuit in three phase power inverter circuit respectively, and the other end of three electric capacity links together.
In the possible implementation of the first, in the possible implementation of the second, this three-phase power converters also comprises: the first center line, for being connected with the center line of electrical network, wherein the first center line is connected to one end linking together of three electric capacity.
The third aspect, a kind of power conversion system is provided, has comprised: the first power conversion circuit is as the power conversion circuit under any possible implementation of first aspect, for direct current is transformed into alternating current, wherein the first terminal is input terminal, and the second terminal is lead-out terminal; The second power conversion circuit is as the power conversion circuit under any possible implementation of first aspect, for alternating current is transformed into direct current, wherein, the second terminal is input terminal, the first terminal is lead-out terminal, and the lead-out terminal of the first power conversion circuit is connected with the input terminal of the second power conversion circuit, or the lead-out terminal of the second power conversion circuit is connected with the input terminal of the first power conversion circuit.
Therefore, the embodiment of the present invention can adopt the power brachium pontis of coupling inductance coupling that comprises the winding that two numbers of turn are different and the power model that comprises a plurality of power brachium pontis to realize power conversion circuit, embodiments of the invention do not need to be strict with the symmetry of the magnetic circuit of the first coupling inductance, therefore, manufacture difficulty diminishes, and the second coupling inductance is the coupling inductance of two windings, and the controllability of manufacture is high, technique is simple, and the relative multichannel coupling inductance of production cost is lower.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, to the accompanying drawing of required use in the embodiment of the present invention be briefly described below, apparently, below described accompanying drawing be only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic block diagram of power conversion circuit according to an embodiment of the invention.
Fig. 2 shows the schematic block diagram of asymmetric coupling inductance according to an embodiment of the invention.
Fig. 3 is the circuit diagram of power brachium pontis according to an embodiment of the invention.
Fig. 4 is the schematic block diagram of power conversion circuit according to another embodiment of the present invention.
Fig. 5 shows the schematic block diagram of asymmetric coupling inductance according to another embodiment of the present invention.
Fig. 6 is the schematic block diagram of power conversion circuit according to another embodiment of the present invention.
Fig. 7 is the schematic block diagram of power conversion circuit according to another embodiment of the present invention.
Fig. 8 is the schematic block diagram of three-phase power converters according to an embodiment of the invention.
Fig. 9 is the schematic block diagram of N phase power inverter according to an embodiment of the invention.
Figure 10 is the schematic block diagram of power conversion system according to an embodiment of the invention.
Figure 11 is the schematic block diagram of power conversion system according to another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work, should belong to the scope of protection of the invention.
Fig. 1 is the schematic block diagram of power conversion circuit 100 according to an embodiment of the invention.Power conversion circuit 100 comprises: the first terminal 110, the second terminal 120, the first power change module 130, the second power brachium pontis 140 and the second coupling inductance 150.
The first power conversion module 130 comprises: individual the first power brachium pontis of M and the first coupling inductance 131, M the first power brachium pontis is connected with the first terminal 110 of power conversion circuit 100, and work in crisscross parallel mode, the first coupling inductance 131 comprises the first magnetic core and is wound on M winding on this first magnetic core, this M winding is connected with M the first power brachium pontis respectively, in order to M the first power brachium pontis that be coupled, M is more than or equal to 2 positive integer.The second power brachium pontis 140, is connected with the first terminal 110 of power conversion circuit 100.The second coupling inductance 150 comprises: the second magnetic core and be wound on the first winding L 1 and the second winding L 2 on this second magnetic core, this first winding L 1 is connected with the coupled end of the first coupling inductance 131, this second winding L 2 is connected with the second power brachium pontis 140, in order to be coupled, the coupled end of this second power brachium pontis 140 and the first power conversion module 130, the second coupling inductances and the second end 120 of power conversion circuit 100 are connected.
Particularly, one end of a plurality of windings of the first coupling inductance intercouples together, and one end of a plurality of windings is connected to coupled end, and the other end of a plurality of windings of the first coupling inductance can be connected with a plurality of power brachium pontis respectively.The number of turn of a plurality of windings of the first coupling inductance can be identical, and magnetic circuit is symmetrical, and therefore, the first coupling inductance is also referred to as symmetrical coupled inductance.The first winding L 1 of the second coupling inductance 150 is connected with M power brachium pontis by M winding of the first coupling inductance.The number of turn of the first winding L 1 of the second coupling inductance 150 can be different from the number of turn of the second winding L 2, and magnetic circuit is asymmetric, and therefore, the second coupling inductance also can be called asymmetric coupling inductance.The ratio of the number of the power brachium pontis that the number of the power brachium pontis that the turn ratio of the first winding L 1 and the second winding L 2 can be connected for the second winding L 2 is connected with the first winding L 1.For example, if being connected the number of the power brachium pontis of (comprising connected directly or indirectly) with the first winding L 1 is M, the number of the power brachium pontis of (the comprising connected directly or indirectly) being connected with the second winding L 2 is N, the turn ratio N:M of the first winding and the second winding.
According to embodiments of the invention, power conversion circuit 100 can be rectification circuit or inverter circuit.For example, when the first terminal 110 is input, when the second terminal 120 is output, power conversion circuit 100 is inverter circuit.On the contrary, when the second terminal 120 is input, when the first terminal 110 is output, power conversion circuit 100 is rectification circuit.
Should understand, in embodiments of the present invention, power brachium pontis can be called many level brachium pontis or many level topology, comprise a plurality of switching tubes, a plurality of switching tubes can complementary conducting or shutoff under the control that drives signal, make it possible to generate time dependent a plurality of level on the interchange node of power brachium pontis, or present in time a plurality of level on interchange node.Crisscross parallel refers to a plurality of power brachium pontis parallel operations, and the default angle of being separated by between the phase place of the driving signal of a plurality of power brachium pontis, for example, and 360/M degree.For example, M the first power brachium pontis can be worked in the mode of phase shifting predetermined angle.For instance, between the phase place of the driving signal of three road power brachium pontis, be divided into mutually 120 degree, between the phase place of the driving signal of five road power brachium pontis, be spaced apart 72 degree.
Should be understood that the interval between the phase place of driving signal of two adjacent many level brachium pontis can be identical angle, for example, 360/M degree, can be also different angles.At embodiments of the invention, can this phase intervals be set to identical angle and make the control method of power brachium pontis simpler.
Therefore, the embodiment of the present invention can adopt the power brachium pontis of coupling inductance coupling that comprises the winding that two numbers of turn are different and the power model that comprises a plurality of power brachium pontis to realize power conversion circuit, embodiments of the invention do not need to be strict with the symmetry of the magnetic circuit of the first coupling inductance, therefore, manufacture difficulty diminishes, and the second coupling inductance is the coupling inductance of two windings, and the controllability of manufacture is high, technique is simple, and the relative multichannel coupling inductance of production cost is lower.
In addition, because asymmetric coupling inductance only has two windings, therefore the processing technology of the magnetic part of asymmetric coupling inductance is simple, makes it possible to control magnetic part parameter characteristic more accurately, do not need to retain larger inductance allowance, thereby improved the response speed of loop.
According to embodiments of the invention, many level brachium pontis is K level brachium pontis, and N road many level brachium pontis generates N+1 level of (K-1) *.For example, many level brachium pontis is three level brachium pontis, and N road many level brachium pontis generates 2N+1 level.For example, three tunnel three level brachium pontis generate seven level, and five tunnel three level brachium pontis generate 13 level.
According to embodiments of the invention, the number of turn of the M of a first coupling inductance winding is identical.The scheme that adopts M winding that the first coupling inductance of the identical number of turn is set can reduce ripple current, thereby suppresses high order harmonic component.
According to embodiments of the invention, the first magnetic core is an interconnective M cylinder, and M winding is wound around respectively M cylinder, and the winding direction of M winding is identical.In other words, M road the first power brachium pontis can be connected respectively to the Same Name of Ends of M winding.Because the structure of such coupling inductance can produce leakage inductance, therefore without inductance is set in filter circuit, thereby reduced the cost of filter circuit.
According to embodiments of the invention, the first winding L 1 of the second coupling inductance 150 and the turn ratio of the second winding L 2 are 1:M, and the second coupling inductance is asymmetric coupling inductance.The first coupling inductance makes a part of high frequency ripple electric current consume between each power brachium pontis with the form of differential mode, makes the ripple frequency of output current (common mode part) be increased to M switching frequency, ripple amplitude doubly and reduces.Umber of turn is that the asymmetric coupling inductance of 1:M is interlocked M times of current i and current i, thereby reduce the amplitude of the high-frequency current ripple on total output current (N+1) * i, make the high-frequency current line wave frequency on total output current be increased to M+1 switching frequency doubly simultaneously.The turn ratio of the first winding L 1 and the second winding L 2 is designed to 1:M, makes the symmetry of the magnetizing inductance of two magnetic circuits in two winding places, thereby has reduced the circulation in two magnetic circuits.
Embodiments of the invention do not need to be strict with the symmetry of the magnetic circuit of the first coupling inductance, and therefore, manufacture difficulty diminishes, the second coupling inductance is the coupling inductance of two windings, the controllability of manufacturing is high, and technique is simple, and the relative multichannel coupling inductance of production cost is lower.Therefore, adopt this asymmetric coupling inductance can realize many level power translation circuit cheaply.
In addition, the turn ratio of the second coupling inductance is designed so that the magnetizing inductance of two magnetic circuits of the second coupling inductance meets symmetry requirement, thereby has reduced the circulation in two magnetic circuits, has improved circuit performance.
According to embodiments of the invention, the power conversion circuit 100 of Fig. 1 also comprises: filter circuit (not shown), filter circuit can be connected with the second terminal 120 of power conversion circuit 100, for alternating current is carried out to filtering.
According to embodiments of the invention, filter circuit can be electric capacity.Filter circuit can carry out filtering to output current, to arrive the more excellent quality of power supply.In addition, embodiments of the invention adopt leakage inductance and the electric capacity that coupling inductance produces to form filter circuit, therefore without inductance is set in filter circuit, can dwindle like this size and the cost of filter circuit, thereby dwindled the size of power conversion circuit, and reduced the cost of power conversion circuit.
Alternatively, as another embodiment, filter circuit can also comprise filter inductance, and for example, this inductance (not shown) can be connected in series between the second terminal 120 and the second coupling inductance 150.
Should be understood that filter circuit can be LC filter or LCL filter.
According to embodiments of the invention, the power conversion circuit 100 of Fig. 1 also comprises: bleeder circuit (not shown), bleeder circuit can be connected between the both positive and negative polarity of the first terminal 110, for direct current is carried out to dividing potential drop.
According to embodiments of the invention, power conversion circuit 100 can be rectification circuit or inverter circuit.For example, when the first terminal 110 is input, when the second terminal 120 is output, power conversion circuit 100 is inverter circuit.On the contrary, when the second terminal 120 is input, when the first terminal 110 is output, power conversion circuit 100 is rectification circuit.
According to the embodiment of the present invention, the second coupling inductance is asymmetric coupling inductance, can reduce the cost of coupling inductance.
Fig. 2 shows the schematic block diagram of asymmetric coupling inductance according to an embodiment of the invention.As shown in Figure 2, the second magnetic core comprises the first magnetic post and the second magnetic post, and the first winding L 1 and the second winding L 2 are wound on respectively on the first magnetic post and the second magnetic post.If being connected the number of the power brachium pontis of (comprising connected directly or indirectly) with the first winding L 1 is M, the number of the power brachium pontis of (the comprising connected directly or indirectly) being connected with the second winding L 2 is N, and the turn ratio of the first winding L 1 and the second winding L 2 is N:M.The turn ratio of the first winding L 1 and the second winding L 2 is designed to N:M, makes the symmetry of the magnetizing inductance of two magnetic circuits in two winding places, thereby has reduced the circulation in two magnetic circuits.
Fig. 3 is the circuit diagram of power brachium pontis according to an embodiment of the invention.As shown in Figure 3, the present embodiment be take neutral point clamp type three level brachium pontis and is described as example.Power brachium pontis shown in Fig. 3 is an example of the power brachium pontis in the embodiment of Fig. 1.Neutral point clamp type three level brachium pontis comprise the first switch Q1 to the four switch Q4 and the first diode D1 to the four diode D4.
The first switching tube Q1 is connected between the first terminal of power conversion circuit and the alternating current node of power brachium pontis.The first diode D1 is in parallel with the first switching tube Q1, and the positive pole of the first diode D1 is connected to the alternating current node of power brachium pontis.One end of the 3rd switching tube Q3 is connected with the alternating current node of power brachium pontis.The 3rd diode D3 is in parallel with the 3rd switching tube Q3, and the positive pole of the 3rd diode D3 is connected with the alternating current node of power brachium pontis.One end of second switch pipe Q2 is connected with the mid point of bleeder circuit, and the other end of second switch pipe Q2 is connected with the other end of the 3rd switching tube Q3.The second diode D2 is in parallel with second switch pipe Q2, and the second positive pole of diode Q2 and the mid point of bleeder circuit are connected.The 4th switching tube Q4 is connected between the second terminal of power conversion circuit and the alternating current node of power brachium pontis.The 4th diode D4 is in parallel with the 4th switching tube Q4, and the negative pole of the 4th diode D4 is connected to the alternating current node of power brachium pontis.
The three level brachium pontis that it should be understood that Fig. 3 are an example of neutral point clamp type three level power brachium pontis, and neutral point clamp type three level power brachium pontis can also have other distortion.
According to embodiments of the invention, switching tube of the present invention can be, but not limited to metal-oxide semiconductor (MOS) (Metal Oxide Semiconductor, MOSFET), insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), integrated gate commutated thyristor (Integrated Gate Commutated Thyristors, IGCT) or the combining form of silicon controlled rectifier (Silicon Controlled Rectifier, SCR) constant power device or different capacity device.
Fig. 4 is the circuit diagram of power conversion circuit 400 according to another embodiment of the present invention.Power conversion circuit 400 is examples of the embodiment of Fig. 1.
The present embodiment be take power conversion circuit and is described as example as power inversion circuit and this power inversion circuit comprise three road neutral point clamp type three level power brachium pontis, but embodiments of the invention are not limited to this, for example, power conversion circuit 400 also can comprise more multichannel three level power brachium pontis.The circuit topology of power conversion circuit of three level power brachium pontis that comprises other number is similar with the circuit topology of power conversion circuit that comprises three tunnel three level power brachium pontis, does not repeat them here.
Power conversion circuit 400 comprises DC bus (Bus) 410, the first power conversion module 430, the second power brachium pontis 440, the second coupling inductance 440, bleeder circuit 460 and filter circuit 470.
Bleeder circuit 460 comprises that the first capacitor C 1 and the second capacitor C 2, the first capacitor C 1 are connected between the mid point Bus_N of Bus+ and bleeder circuit, and the second capacitor C 2 is connected between Bus-and Bus_N.
The first power conversion module 430 comprises three level power brachium pontis A and three level power brachium pontis B, and the second power brachium pontis 440 is three level power brachium pontis C.The circuit topology of every road three level brachium pontis as shown in Figure 3, does not repeat them here.The interchange node of every road three level brachium pontis is connected respectively on the winding of corresponding coupling inductance.The second switch pipe Q2 of each three level brachium pontis and the 3rd switch Q4 are connected in series in exchanging between node of Bus_N and three level brachium pontis.The first switching tube Q1 of each three level brachium pontis is connected to the Bus_+ of DC bus and exchanging between node of this three level brachium pontis.The 4th switching tube Q4 of each three level brachium pontis is connected to the Bus_-of DC bus and exchanging between node of this three level brachium pontis.The clamp mid point of each three level brachium pontis is connected with the mid point of bleeder circuit.
The first power conversion module 430 also comprises the first coupling inductance 431, two winding L 1' of this first coupling inductance 431 and L2' share the first magnetic core, this first magnetic core comprises two cylinders, two windings be wrapped in respectively on two cylinders and winding direction identical, two head ends of two windings are connected with the interchange node b of three level power brachium pontis B with the interchange node a of three level brachium pontis A respectively, two tail ends of two windings are connected with the head end of the winding L 1 in the second coupling inductance, wherein, the turn ratio of winding L 1' and winding L 2' is 1:1.
Should understand, two winding L 1 of the second coupling inductance 450 and L2 share the second magnetic core, this second magnetic core can comprise two magnetic posts, winding L 1 be wound on respectively on two magnetic posts with L2 and winding direction identical, the head end of winding L 2 is connected with the interchange node c of three level power brachium pontis C, and the tail end of winding L 1 and L2 is connected with the head end of filter inductance L, and the tail end of filter inductance L is connected with the second terminal 420 of this power conversion circuit 400, wherein, the turn ratio of winding L 1 and winding L 2 is 1:2.In addition, filter circuit 470 comprises capacitor C 3 and filter inductance L, and capacitor C 3 is connected with the second terminal 420 of power conversion circuit 400.
Should understand, embodiment as an alternative, two winding L 1 of the second coupling inductance 450 and L2 share the second magnetic core, this second magnetic core can comprise three magnetic posts, winding L 1 be wound on respectively on two magnetic posts in three magnetic posts with L2 and winding direction identical, filter inductance L is wound on the 3rd magnetic post, the head end of winding L 2 is connected with the interchange node c of three level power brachium pontis C, the tail end of winding L 1 and L2 is connected with the head end of filter inductance L, the tail end of filter inductance L is connected with the second terminal 420 of this power conversion circuit 400, wherein, the turn ratio of winding L 1 and winding L 2 is 1:2.In addition, filter circuit 470 can consist of the filter inductance L in capacitor C 3 and the second coupling inductance, and capacitor C 3 is connected with the second terminal 420 of power conversion circuit 400.
It should be understood that filter circuit 450 is connected with AC power (not shown) when power conversion circuit 400 is rectifier, filter circuit 450 receives alternating currents input.When power conversion circuit 400 is inverter, filter circuit is connected with load (not shown), i.e. filter circuit 450 output AC electricity.
Fig. 5 shows the schematic block diagram of asymmetric coupling inductance according to another embodiment of the present invention.As shown in Figure 5, the second magnetic core comprises the first magnetic post, the second magnetic post and the 3rd magnetic post, the first winding L 1 and the second winding L 2 are wound on respectively on the first magnetic post and the second magnetic post, and filter inductance L is wound on the 3rd magnetic post, and the first winding L 1 and the second winding L 2 are coupled with filter inductance L respectively.
According to the embodiment of the present invention, the second coupling inductance is asymmetric coupling inductance, and on the 3rd magnetic post that filter inductance winding is comprised in asymmetric coupling inductance, can dwindle size and the cost of filter circuit, thereby dwindled the size of power conversion circuit, and reduced the cost of power conversion circuit.
The schematic block diagram of Fig. 6 power conversion circuit 600 according to another embodiment of the present invention.Power conversion circuit 600 comprises: the first terminal 610, the second terminal 620, the first power conversion module 630, the second power brachium pontis 640 and the second coupling inductance 650.Power conversion circuit 600 is similar with the power conversion circuit 100 of Fig. 1, at this, suitably omits detailed description.
Different from the power conversion circuit 100 of Fig. 1, the power conversion circuit 600 of Fig. 6 also comprises: the 3rd power brachium pontis 660 and the 3rd coupling inductance 670.The 3rd power brachium pontis 660 is connected with the first terminal 610 of power conversion circuit 600.The 3rd coupling inductance 670 comprises: tertiary winding L3 and the 4th winding L 4, this tertiary winding L3 is connected with the coupled end of the second coupling inductance 650, the 4th winding L 4 is connected with the 3rd power brachium pontis 660, in order to the first power conversion module 630, the second power brachium pontis 640 and the 3rd power brachium pontis 660 of being coupled, wherein, the coupled end of the second coupling inductance 650 is connected with the second end 620 of power conversion circuit 600 by the 3rd coupling inductance 670, and the turn ratio of tertiary winding L3 and the 4th winding L 4 is 1:(M+1).
Should be understood that in embodiments of the present invention, power conversion circuit 600 can comprise a plurality of the 3rd power brachium pontis and a plurality of the 3rd coupling inductance.For example: power conversion circuit 600 comprises P the 3rd power brachium pontis and P the 3rd coupling inductance, has:
The 1st the 3rd coupling inductance 670 comprises tertiary winding L3
1with the 4th winding L 4
1, tertiary winding L3
1be connected with the coupled end of the second coupling inductance 650, the 4th winding L 4
1be connected with the 1st the 3rd power brachium pontis 660, in order to the first power conversion module 630, the second power brachium pontis 640 and the 1st the 3rd power brachium pontis 660 of being coupled, wherein, the turn ratio of tertiary winding L3 and the 4th winding L 4 is 1:(M+1).P is more than or equal to 1 positive integer.
I the 3rd coupling inductance comprises tertiary winding L3
iwith the 4th winding L 4
i, tertiary winding L3
ibe connected with the coupled end of i-1 the 3rd coupling inductance, the 4th winding L 4
ibe connected with i the 3rd power brachium pontis, wherein, the value of i is the integer from 2 to P, in order to the first power conversion module 630, the second power brachium pontis 640 and i the 3rd power brachium pontis that be coupled, wherein, tertiary winding L3
iwith the 4th winding L 4
iturn ratio be 1:(M+i).
P the 3rd coupling inductance comprises tertiary winding L3
pwith the 4th winding L 4
p, tertiary winding L3
pbe connected with the coupled end of P-1 the 3rd coupling inductance, the 4th winding L 4
pbe connected with P the 3rd power brachium pontis, in order to the first power conversion module 640 and P the 3rd power brachium pontis that be coupled, wherein, the coupled end of the second coupling inductance 650 is connected with the second end 620 of power conversion circuit 600 by P the 3rd coupling inductance, tertiary winding L3
pwith the 4th winding L 4
pturn ratio be 1:(M+P).
According to embodiments of the invention, the power conversion circuit 600 of Fig. 6 also comprises: filter circuit 680, filter circuit 680 is connected with the second terminal 620 of power conversion circuit 600, for alternating current is carried out to filtering.
According to embodiments of the invention, filter circuit 680 is electric capacity.Embodiments of the invention adopt leakage inductance and the electric capacity that coupling inductance produces to form filter circuit, therefore without inductance is set in filter circuit, can dwindle like this size and the cost of filter circuit, thus the size of having dwindled power conversion circuit, and reduced the cost of power conversion circuit.
Alternatively, as another embodiment, filter circuit can also comprise filter inductance, and for example, this inductance (not shown) can be connected in series between the second terminal 620 and the 3rd coupling inductance 670.Should be understood that in embodiments of the present invention, the winding method of filter inductance as shown in Figure 5, does not repeat them here.
According to embodiments of the invention, power conversion circuit 600 can be rectification circuit or inverter circuit.For example, when the first terminal 610 is input, when the second terminal 620 is output, power conversion circuit 600 is inverter circuit.On the contrary, when the second terminal 620 is input, when the first terminal 610 is output, power conversion circuit 600 is rectification circuit.
Fig. 7 is the schematic block diagram of power conversion circuit 700 according to another embodiment of the present invention.Power conversion circuit 700 comprises: the first terminal 710, the second terminal 720, the first power conversion module 730, the second power brachium pontis 740, the second coupling inductance 750 second power conversion modules 760 and the 5th coupling inductance 770.
The first power conversion module 730 comprises: individual the first power brachium pontis of M and the first coupling inductance 731, M the first power brachium pontis is connected with the first terminal 710 of power conversion circuit 700, and work in crisscross parallel mode, the first coupling inductance 731 comprises the first magnetic core and is wound on M winding on this first magnetic core, M winding is connected with M the first power brachium pontis respectively, and in order to M the first power brachium pontis that be coupled, the number of turn of M winding is identical, wherein, M is more than or equal to 2 positive integer.
The second power conversion module 760 comprises: individual the 4th power brachium pontis of N and the 4th coupling inductance 761, N the 4th power brachium pontis is connected with the first terminal 710 of described power conversion circuit 700, and work in crisscross parallel mode, the 4th coupling inductance comprises the 4th magnetic core and is wound on N winding on the 4th magnetic core, this N winding is connected with N the 4th power brachium pontis respectively, and for N the 4th power brachium pontis that be coupled, the number of turn of N winding is identical, wherein, N is more than or equal to 2 positive integer.
The 5th coupling inductance 770 comprises: the 5th winding L 5 and the 6th winding L 6, described the second power conversion module and described the first power conversion module are used for being coupled, wherein, the 5th winding L 5 is connected with the coupled end of the first coupling inductance 731, the 6th winding L 7 is connected with the coupled end of the 4th coupling inductance 761, and the turn ratio of the 5th winding L 5 and the 6th winding L 7 is N:M.
The second power brachium pontis 740 is connected with the first terminal of power conversion circuit 700.
The second coupling inductance 750 comprises: the second magnetic core and be wound on the first winding L 1 and the second winding L 2 on this second magnetic core, this first winding L 1 is connected with the coupled end of the 5th coupling inductance 770, the second winding L 2 is connected with the second power brachium pontis 740, in order to described the first power conversion module 730, the second power brachium pontis 740 and the second power conversion module 760 of being coupled, the coupled end of the second coupling inductance 750 is connected with the second end 720 of power conversion circuit 700, wherein, the turn ratio of the first winding L 1 and the second winding L 2 is 1:(M+N).
Should be understood that in embodiments of the present invention N the power brachium pontis that M power brachium pontis that the first power conversion module comprises and the second power conversion module comprise, can be quantitatively that what to equate can be also unequal, be that M can equal N, M also can be not equal to N, and symmetry of the present invention is not construed as limiting.
Should also be understood that in embodiments of the present invention, power conversion circuit 700 can comprise a plurality of the second power brachium pontis and a plurality of the second coupling inductance.For example: power conversion circuit 700 comprises K the second power brachium pontis and K the second coupling inductance, and wherein, K gets the positive integer that is greater than or equal to 2, has:
The 1st the second coupling inductance 750 comprises the first winding L 1
1with the second winding L 2
1, the first winding L 1
1be connected with the coupled end of the 5th coupling inductance 770, the second winding L 2
1be connected with the 1st the second power brachium pontis 740, in order to the first power conversion module 730, the second power conversion module 770 and the 1st the second power brachium pontis 740 of being coupled, wherein, the first winding L 1
1with the second winding L 2
1turn ratio be 1:(M+N).
I the first winding L 1 that the second coupling inductance comprises
iwith the second winding L 2
iin the first winding L 1
ibe connected with the coupled end of i-1 the second coupling inductance, the second winding L 2
ibe connected with i the second power brachium pontis, wherein, the value of i is the integer from 2 to k, in order to the first power conversion module 730, the second power conversion module 760 and i the second power brachium pontis that be coupled, wherein, the first winding L 1
iwith the second winding L 2
iturn ratio be 1:(M+N+i).
K the first winding L 1 that the second coupling inductance comprises
kwith the second winding L 2
kin the first winding L 1
kbe connected with the coupled end of k-1 the second coupling inductance, the second winding L 2
kbe connected with k the second power brachium pontis, in order to the first power conversion module 730, the second power conversion module 760 and K the second power brachium pontis that be coupled, wherein, K the second coupling inductance is connected with the second end 720 of power conversion circuit 700, the first winding L 1
kwith the second winding L 2
kturn ratio be 1:(M+N+K).
Will also be understood that, in embodiments of the present invention, power conversion circuit 700 can also comprise a plurality of the second power conversion modules and a plurality of the 5th coupling inductance, wherein, the quantity of the power brachium pontis that each the second power conversion module in a plurality of the second power conversion modules comprises can be identical, also can be not identical.
Fig. 8 is the schematic block diagram of three-phase power converters 800 according to an embodiment of the invention.Three-phase power converters 800 comprises: A phase power conversion circuit 820, B phase power conversion circuit 830 and C phase power conversion circuit 840, and for carry out power conversion between three-phase alternating current and direct current.
Every phase power conversion circuit in A phase power conversion circuit 820, B phase power conversion circuit 830, C phase power conversion circuit 840 is the power conversion circuit as described in the embodiment of Fig. 1 to Fig. 6.
Alternatively, as another embodiment, three-phase power converters 800 also comprises: three-phase filter circuit, comprise A phase capacitor C 1, B phase capacitor C 2 and C phase capacitor C 3, for three-phase alternating current is carried out to filtering, one end of each electric capacity in three electric capacity is connected with the second terminal of a phase power conversion circuit in three phase power translation circuit respectively, and the other end in these three electric capacity links together.
Alternatively, as another embodiment, three-phase power converters 800 also comprises the first center line N, and for being connected with the center line of electrical network, wherein this first center line is connected to one end linking together of each electric capacity in A phase capacitor C 1, B phase capacitor C 2 and C phase capacitor C 3.
Therefore, in the three-phase power converters providing in the embodiment of the present invention, can adopt the power brachium pontis of coupling inductance coupling that comprises the winding that two numbers of turn are different and the power model that comprises a plurality of power brachium pontis to realize power conversion circuit, embodiments of the invention do not need to be strict with the symmetry of the magnetic circuit of the first coupling inductance, therefore, manufacture difficulty diminishes, and the second coupling inductance is the coupling inductance of two windings, the controllability of manufacturing is high, technique is simple, and the relative multichannel coupling inductance of production cost is lower.。
Should be understood that three-phase power converters 800 can be three-phase power inverter, receive respectively the direct voltage 810 of access, and through inversion output three-phase alternating voltage V_a, V_b and V_c.
Should be understood that three-phase power converters 800 can be also three phase power rectifier, be respectively used to receive three-phase alternating current input voltage V_a, V_b and V_c, and through over commutation output dc voltage.
Fig. 9 is the schematic block diagram of N phase power inverter 900 according to an embodiment of the invention.N phase power inverter 900 comprises: A phase power conversion circuit 920, B phase power conversion circuit 930, C phase power conversion circuit 940 ..., N phase power conversion circuit, for carry out power conversion between N cross streams electricity and direct current.
Every phase power conversion circuit in N phase power conversion circuit is the power conversion circuit as described in the embodiment of Fig. 1 to Fig. 6.
Alternatively, as another embodiment, N phase power inverter 900 also comprises: N electric capacity, be used for and N cross streams electricity is carried out to filtering, one end of each electric capacity in N electric capacity is connected with the second terminal of a phase power conversion circuit in N phase power conversion circuit respectively, and the other end in this N electric capacity links together.
Alternatively, as another embodiment, three-phase power converters 900 also comprises the first center line N, and for being connected with the center line of electrical network, wherein this first center line is connected to one end linking together of N each electric capacity in electric capacity.
Therefore, in the N phase power inverter providing in the embodiment of the present invention, can adopt the power brachium pontis of coupling inductance coupling that comprises the winding that two numbers of turn are different and the power model that comprises a plurality of power brachium pontis to realize power conversion circuit, embodiments of the invention do not need to be strict with the symmetry of the magnetic circuit of the first coupling inductance, therefore, manufacture difficulty diminishes, and the second coupling inductance is the coupling inductance of two windings, the controllability of manufacturing is high, technique is simple, and the relative multichannel coupling inductance of production cost is lower.。
Should be understood that N phase power inverter 900 can be N phase power inverter, receive respectively the direct voltage 910 of access, and through inversion output N cross streams voltage V_a, V_b, V_c ..., V_n.
Should be understood that N phase power inverter 900 can be also N phase power rectifier, be respectively used to receive N cross streams input voltage V_a, V_b, V_c ..., V_n, and through over commutation output dc voltage.
Figure 10 is the schematic block diagram of power conversion system 1000 according to an embodiment of the invention.Power conversion system 1000 comprises the first power conversion circuit and the second power conversion circuit, for realizing AC/AC (AC/AC) conversion.The first power conversion circuit can be for power conversion circuit 100 as described in Figure 1, for direct current is transformed into alternating current.The second power conversion circuit can be for power conversion circuit 600 as described in Figure 6, for alternating current is transformed into direct current.The input terminal of power conversion circuit 100 is connected with the lead-out terminal of power conversion circuit 600.In other words, the output of the direct current of the second power conversion circuit is connected to the first power conversion circuit direct current input, thereby realizes AC/AC conversion.
Therefore, in the power conversion system providing in the embodiment of the present invention, can adopt the power brachium pontis of coupling inductance coupling that comprises the winding that two numbers of turn are different and the power model that comprises a plurality of power brachium pontis to realize power conversion circuit, embodiments of the invention do not need to be strict with the symmetry of the magnetic circuit of the first coupling inductance, therefore, manufacture difficulty diminishes, and the second coupling inductance is the coupling inductance of two windings, the controllability of manufacturing is high, technique is simple, and the relative multichannel coupling inductance of production cost is lower.。
In addition, by the direct current output of the second power conversion circuit is connected to the first power conversion circuit direct current, input, thereby realize AC/AC conversion.
Figure 11 is the schematic block diagram of power conversion system 1100 according to another embodiment of the present invention.Power conversion system 1100 comprises the first power conversion circuit and the second power conversion circuit, for realizing DC-DC (DC/DC) conversion.The first power conversion circuit can be for power conversion circuit 100 as described in Figure 1, for direct current is transformed into alternating current.The second power conversion circuit can be for power conversion circuit 600 as described in Figure 6, for alternating current is transformed into direct current.The lead-out terminal of power conversion circuit 100 is connected with the input terminal of power conversion circuit 600.In other words, the interchange of the first power conversion circuit output is connected to the second power conversion circuit and exchanges input, thereby realizes DC/DC conversion.
Therefore, in the power conversion system providing in the embodiment of the present invention, can adopt the power brachium pontis of coupling inductance coupling that comprises the winding that two numbers of turn are different and the power model that comprises a plurality of power brachium pontis to realize power conversion circuit, embodiments of the invention do not need to be strict with the symmetry of the magnetic circuit of the first coupling inductance, therefore, manufacture difficulty diminishes, and the second coupling inductance is the coupling inductance of two windings, the controllability of manufacturing is high, technique is simple, and the relative multichannel coupling inductance of production cost is lower.
In addition, by the interchange of the first power conversion circuit, export and be connected to the second power conversion circuit interchange input, thereby realize DC/DC conversion.
Although the present invention be have been described in detail by reference to accompanying drawing mode in conjunction with the preferred embodiments, the present invention is not limited to this.Without departing from the spirit and substance of the premise in the present invention, those of ordinary skills can carry out to embodiments of the invention modification or the replacement of various equivalences, and these modifications or replacement all should be in covering scopes of the present invention.
Claims (12)
1. a power conversion circuit, is characterized in that, comprising:
The first power conversion module, described the first power conversion module comprises M the first power brachium pontis and the first coupling inductance, described M the first power brachium pontis is connected with the first terminal of described power conversion circuit, and work in crisscross parallel mode, described the first coupling inductance comprises the first magnetic core and is wound on M winding on described the first magnetic core, a described M winding is connected with described M the first power brachium pontis respectively, in order to described M the first power brachium pontis that be coupled, M is more than or equal to 2 positive integer, and the number of turn of a described M winding is identical;
The second power brachium pontis, is connected with the described the first terminal of described power conversion circuit;
The second coupling inductance, described the second coupling inductance comprises the second magnetic core and is wound on the first winding and the second winding on described the second magnetic core, described the first winding is connected with the coupled end of described the first coupling inductance, described the second winding is connected with described the second power brachium pontis, in order to described the second power brachium pontis and described the first power conversion module of being coupled, the coupled end of described the second coupling inductance is connected with the second terminal of described power conversion circuit, and described the first winding is different with the number of turn of the second winding.
2. power conversion circuit according to claim 1, it is characterized in that, described the first magnetic core is an interconnective M cylinder, a described M winding is wound on respectively on a described M cylinder, and the coiling direction of a described M winding is identical, the number of turn of a described M winding is identical, and the turn ratio of described the first winding and described the second winding is the ratio of the number of the power brachium pontis that is connected with described the first winding of the number of the power brachium pontis that is connected of described the second winding.
3. power conversion circuit according to claim 1, it is characterized in that, also comprise: P the 3rd power brachium pontis and P the 3rd coupling inductance, described P the 3rd power brachium pontis is connected with the described the first terminal of described power conversion circuit respectively, described P the 3rd coupling inductance described P the 3rd power brachium pontis that be respectively used to be coupled, described the second power brachium pontis and described the first power conversion module, wherein, each the 3rd coupling inductance in described P the 3rd coupling inductance comprises the tertiary winding and the 4th winding, the number that the turn ratio of the described tertiary winding and described the 4th winding equals the power brachium pontis that described the 4th winding is connected is connected the ratio of the number of power brachium pontis with the described tertiary winding, P is more than or equal to 1 positive integer.
4. power conversion circuit according to claim 3, is characterized in that, described P the 3rd power brachium pontis comprises a 3rd power brachium pontis, is connected with the described the first terminal of described power conversion circuit;
Described P the 3rd coupling inductance comprises the 3rd coupling inductance, described the 3rd coupling inductance comprises the tertiary winding and the 4th winding, the described tertiary winding is connected with the coupled end of described the second coupling inductance, described the 4th winding is connected with described the 3rd power brachium pontis, in order to described the 3rd power brachium pontis that is coupled, described the second power brachium pontis and described the first power conversion module, wherein, the coupled end of described the second coupling inductance is connected with described second terminal of described power conversion circuit by described the 3rd coupling inductance, the turn ratio of the described tertiary winding and described the 4th winding is 1:(M+1).
5. power conversion circuit according to claim 1, is characterized in that, also comprises:
The second power conversion module, described the second power conversion module comprises N the 4th power brachium pontis and the 4th coupling inductance, described N the 4th power brachium pontis is connected with the described the first terminal of described power conversion circuit, and work in crisscross parallel mode, described the 4th coupling inductance comprises the 4th magnetic core and is wound on N winding on described the 4th magnetic core, a described N winding is connected with described N the 4th power brachium pontis respectively, for described N the 4th power brachium pontis that be coupled;
The 5th coupling inductance, comprise the 5th winding and the 6th winding, described the second power conversion module and described the first power conversion module are used for being coupled, wherein, described the 5th winding is connected with the coupled end of described the first coupling inductance, described the 6th winding is connected with the coupled end of described the 4th coupling inductance, the number of turn of a described M winding is identical, the number of turn of a described N winding is identical, the turn ratio of described the first winding and described the second winding is 1:(N+M), the turn ratio of described the 5th winding and described the 6th winding is N:M, N is more than or equal to 2 integer, described the first winding is connected with the coupled end of described the first coupling inductance by described the 5th coupling inductance.
6. according to the power inverter described in any one in claim 1-5, it is characterized in that, also comprise:
Filter circuit, comprises electric capacity, and described filter circuit is connected with described the second terminal, for described alternating current is carried out to filtering.
7. power inverter according to claim 6, described filter circuit also comprises filter inductance, described the second magnetic core comprises the first magnetic post, the second magnetic post and the 3rd magnetic post, described the first winding and described the second winding are wound on respectively on described the first magnetic post and described the second magnetic post, described filter inductance is wound on described the 3rd magnetic post, and described the first winding and described the second winding are coupled with described filter inductance respectively.
8. according to the power conversion circuit described in any one in claim 1 to 7, it is characterized in that, described power brachium pontis is neutral point clamp type many level brachium pontis or capacitor-clamped many level of type brachium pontis.
9. a three-phase power converters, is characterized in that, comprising:
Three phase power translation circuit, for carry out power conversion between three-phase alternating current point and dc point, wherein every phase power conversion circuit comprises according to the power conversion circuit described in any one in claim 1-5.
10. power inverter according to claim 9, is characterized in that, also comprises:
Three-phase filter circuit, comprise three electric capacity, for described three-phase alternating current is carried out to filtering, one end of each electric capacity in described three electric capacity is connected with the second terminal of a phase power inversion circuit in described three phase power inverter circuit respectively, and the other end of described three electric capacity links together.
11. three-phase power converters according to claim 10, is characterized in that, also comprise:
The first center line, for being connected with the center line of electrical network, wherein said the first center line is connected to one end linking together of described three electric capacity.
12. 1 kinds of power conversion systems, is characterized in that, comprising:
The first power conversion circuit is according to the power conversion circuit described in any one in claim 1-11, and for direct current is transformed into alternating current, wherein said the first terminal is input terminal, and described the second terminal is lead-out terminal;
The second power conversion circuit is according to the power conversion circuit described in any one in claim 1-11, for alternating current is transformed into direct current, wherein, described the second terminal is input terminal, described the first terminal is lead-out terminal, and the lead-out terminal of described the first power conversion circuit is connected with the input terminal of described the second power conversion circuit, or the lead-out terminal of described the second power conversion circuit is connected with the input terminal of described the first power conversion circuit.
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