CN104009658A - Power conversion circuit and power conversion system - Google Patents
Power conversion circuit and power conversion system Download PDFInfo
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- CN104009658A CN104009658A CN201410231197.XA CN201410231197A CN104009658A CN 104009658 A CN104009658 A CN 104009658A CN 201410231197 A CN201410231197 A CN 201410231197A CN 104009658 A CN104009658 A CN 104009658A
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Abstract
The invention provides a power conversion circuit and a power conversion system. The power conversion circuit comprises multiple routes of power bridge arms, at least one first switch, a coupling inductor and a controller. The first switch is connected between at least one of the multiple routes of power bridge rams and at least one of windings contained in the coupling inductor. The controller controls the first switch to be turned off when the output power of the power conversion circuit is smaller than the first threshold value. In the power conversion circuit, when the output power of the power conversion circuit is smaller than a preset threshold value, the current sensed by one of the windings of the coupling inductor can not pass through a diode connected with the corresponding power bridge arm in parallel by controlling the switch between the power bridge arm and the winding of the coupling inductor to be turned off, and therefore rated power loss is reduced, and efficiency of the power conversion circuit is improved.
Description
Technical field
The present invention relates to electric and electronic technical field, 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.This multi-electrical level inverter comprises multiple power brachium pontis in parallel, and multiple power brachium pontis pass through multiple 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 reduce the volume of magnetic element in circuit.
But in underloading situation, the work switching loss brought of multiple power brachium pontis has affected the lifting of overall efficiency greatly simultaneously.Although in underloading situation, can quit work to promote overall efficiency by control section power brachium pontis, but the electric current that coupling inductance induces also can flow through the diode in parallel with out-of-work power brachium pontis, this will bring extra power loss, thereby is unfavorable for the further lifting of overall efficiency.
Summary of the invention
The embodiment of the present invention provides a kind of power conversion circuit and power conversion system, can reduce the power loss that electric current that coupling inductance induces brings.
First aspect, proposes a kind of power conversion circuit, comprising: multichannel power brachium pontis, is connected with direct current by the first terminal of power conversion circuit; Coupling inductance, comprises multiple windings, is connected with alternating current by the second terminal of power conversion circuit; At least one first switch, is connected between at least one winding at least one road power brachium pontis and the multiple winding in multichannel power brachium pontis; Controller, in the time that the power output of power conversion circuit is less than first threshold, controls at least one first switch and disconnects.
In conjunction with first aspect, under the possible implementation of the first, controller is also controlled the staggered work of multichannel power brachium pontis, and in the time that the power output of power conversion circuit is less than described first threshold, controls at least one road power brachium pontis and quit work.
In conjunction with the possible implementation of the first of first aspect, under the possible implementation of the second, controller also, in the time that the power output of power conversion circuit is greater than Second Threshold, is controlled at least one first switch closure, and controls the power brachium pontis work of at least one road.
In conjunction with the possible implementation of the second of first aspect, under the third possible implementation, controller is in the time that the power output of power conversion circuit is between first threshold and Second Threshold, part the first switch of controlling at least one first switch disconnects, and control quits work with the power brachium pontis that part the first switch is connected.
In conjunction with the first of first aspect or first aspect to any the possible implementation in the third possible implementation; under the 4th kind of possible implementation; coupling inductance also comprises: at least one voltage clamping device; at least one voltage clamping device is connected across respectively the two ends of at least one winding, for overvoltage protection is carried out at least one winding two ends.
In conjunction with the 4th kind of possible implementation of first aspect, under the 5th kind of possible implementation, at least one voltage clamping device comprises the one in piezo-resistance, Transient Voltage Suppressor and voltage stabilizing didoe, or the combination in any of piezo-resistance, Transient Voltage Suppressor and voltage stabilizing didoe.
In conjunction with first aspect or above-mentioned any possible implementation, under the 6th kind of possible implementation, power conversion circuit also comprises: second switch, be connected between coupling inductance and the second terminal, for power conversion circuit being connected to electrical network under the control of controller or disconnecting from electrical network.
In conjunction with first aspect or above-mentioned any possible implementation, under the 7th kind of possible implementation, at least one first switch is contactor, relay, metal oxide layer semiconductor field-effect transistor (Metal Oxide Semiconductor, MOSFET), insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), integrated gate commutated thyristor (Integrated Gate Commutated Thyristor, and silicon controlled rectifier (Silicon Controlled Rectifier IGCT), one of SCR), or at least one first switch is contactor, relay, MOSFET, IGBT, the combination in any of IGCT and SCR.
In conjunction with first aspect or above-mentioned any possible implementation, under the 8th kind of possible implementation, the first terminal is one of power conversion circuit input and output, another in input and output that the second terminal is power conversion circuit.
In conjunction with first aspect or above-mentioned any possible implementation, under the 9th kind of possible implementation, power conversion circuit also comprises: filter circuit, filter circuit is connected between coupling inductance and the second terminal, for alternating current is carried out to filtering.
Second aspect, a kind of three-phase power converters is provided, comprise: three phase power translation circuit, for carry out power conversion between three-phase alternating current and direct current, wherein every phase power conversion circuit comprises as the power conversion circuit under any possible implementation in eight kinds of possible implementations of the first to the of first aspect or first aspect.
In conjunction with second aspect, under the possible implementation of the first, three-phase power converters also comprises: three electric capacity, are connected with the coupling inductance of three phase power translation circuit respectively, for three-phase alternating current is carried out to filtering.
In conjunction with the possible implementation of the first of second aspect, under the possible implementation of the second, 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, comprise: the first power conversion circuit and the second power conversion circuit, wherein the first power conversion circuit is as the power conversion circuit under any possible implementation of first aspect or as the power conversion circuit under any possible implementation of second aspect, for direct current is transformed into alternating current, wherein the first terminal of the first power conversion circuit is the input terminal of the first power conversion circuit, and the second terminal of the first power conversion circuit is the lead-out terminal of the first power conversion circuit; 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 of the second power conversion circuit is the input terminal of the second power conversion circuit, the first terminal of the second power conversion circuit is the lead-out terminal of the second power conversion circuit, 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.
Fourth aspect, a kind of power converting method is provided, this comprises: the staggered work of the multichannel power brachium pontis of power ratio control translation circuit, and wherein at least one road power brachium pontis in this multichannel power brachium pontis is connected by least one winding in multiple windings of at least one first switch and the coupling inductance of this power conversion circuit; In the time that the power output of this power conversion circuit is less than first threshold, controls this at least one first switch and disconnect.
In conjunction with fourth aspect, under the possible implementation of the first, the method also comprises: in the time that the power output of this power conversion circuit is less than first threshold, controls this at least one road power brachium pontis and quit work.
In conjunction with the possible implementation of the first of fourth aspect, under the possible implementation of the second, in the time that the power output of this power conversion circuit is greater than Second Threshold, controls this at least one first switch closure, and control this at least one road power brachium pontis work.
In conjunction with the possible implementation of the second of fourth aspect, under the third possible implementation, the method also comprises: in the time that the power output of this power conversion circuit is between this first threshold and this Second Threshold, part the first switch of controlling in this at least one first switch disconnects, and the power brachium pontis that control is connected with this part first switch quits work.
Based on technique scheme, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, make the electric current that the winding of coupling inductance induces can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
Brief description of the drawings
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, described accompanying drawing is only some embodiments of the present invention below, for those of ordinary skill in the art, 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 the power conversion circuit of another embodiment of the present invention.
Fig. 3 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 4 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 5 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 6 shows the schematic block diagram of the power conversion circuit of another embodiment of the present invention.
Fig. 7 shows the schematic block diagram of the power conversion circuit of 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 power conversion system according to an embodiment of the invention.
Figure 10 is the schematic block diagram of power conversion system according to another embodiment of the present invention.
Figure 11 is the schematic flow diagram of power converting method according to an embodiment of the 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, instead of whole embodiment.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, should belong to the scope of protection of the invention.
Embodiments of the invention are applied to the multi-level power converter that adopts interleaving technique, embodiments of the invention are not construed as limiting the level grade of multi-level power converter, for example, multi-level power converter can two level power converters, three level power converter and five level power converters etc.Embodiments of the invention are also not construed as limiting the type of multi-level power converter, and for example, multi-level power converter can be diode-clamped multi-level power converter, can be also capacitor-clamped type multi-level power converter etc.
In underloading situation, can quit work and promote the efficiency of complete machine when obtaining many level effect by controlling the Partial Power brachium pontis of multi-level power converter, but due to the existence of coupling inductance, the winding that out-of-work power brachium pontis connects can induce electric current, and this electric current inducing can flow through the diode in parallel with out-of-work power brachium pontis, thereby bring extra power loss, be unfavorable for the further lifting of overall efficiency.
Fig. 1 is the schematic block diagram of power conversion circuit 100 according to an embodiment of the invention.
Power conversion circuit 100 comprises multichannel power brachium pontis 120, at least one the first switch 130, coupling inductance 140 and controller 150.Wherein, multichannel power brachium pontis 120 is connected with direct current by the first terminal 110 of power conversion circuit 100; Coupling inductance 140, comprises multiple windings, is connected with alternating current by the second terminal 160 of power conversion circuit 100; At least one first switch 130, is connected between at least one winding at least one road power brachium pontis and N the winding in N road power brachium pontis 120; Controller 150, in the time that the power output of power conversion circuit 100 is less than first threshold, controls at least one first switch 130 and disconnects.
According to embodiments of the invention, multichannel power brachium pontis 120 can comprise N road power brachium pontis, and N is greater than or equal to 2 integer, multiple windings that coupling inductance 140 comprises can be also N windings, at least one first switch 130 can comprise M the first switch, and wherein, M is the integer that is less than N.N winding is coupled into coupling inductance 140 by a magnetic core, M road power brachium pontis in the power brachium pontis of N road is connected to M winding in N winding of coupling inductance 140 by M the first switch respectively, and power brachium pontis Zhong N-M road, N road power brachium pontis is directly connected with N-M winding of coupling inductance 140 respectively.Normally work at power conversion circuit (load that is power conversion circuit is normal), controller 150 is controlled the staggered work of N road power brachium pontis 120, for example, N road power brachium pontis 120 carries out crisscross parallel work driving in the switch periods of signal taking the angle of phase shifting as the mode of 360/N degree.In addition, in the time that the power output of power conversion circuit 100 is less than first threshold, when the load of power conversion circuit is underloading, controller 150 is controlled M the first switch 130 and is disconnected.In other words,, in the time that the load of power conversion circuit 100 is underloading, controller 150 can be controlled M the first switch 130 and disconnect.Correspondingly, controller 150 can also be controlled the M road power brachium pontis being connected with M the first switch 130 respectively in N road power brachium pontis 120 and quit work, for example: can be in the time that the power output of power conversion circuit 100 is less than first threshold, controlling M road power brachium pontis quits work, also can be in the time that the power output of power conversion circuit 100 be less than another threshold value, control M road power brachium pontis and quit work.In other words, controlling the first switch disconnection and control the out-of-work threshold value of M road power brachium pontis can be that same threshold value can be also different threshold values.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, make the electric current that the winding of coupling inductance induces can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
Alternatively, as another embodiment, described controller is also controlled the staggered work of described multichannel power brachium pontis, and in the time that the power output of described power conversion circuit is less than described first threshold, controls described at least one road power brachium pontis and quit work.
In other words, in the time that the load of power conversion circuit 100 is underloading, controller 150 can be controlled M the first switch 130 and disconnect, and can control the M road power brachium pontis being connected with M the first switch 130 respectively in N road power brachium pontis 120 and quit work.
Alternately, as an another embodiment, described controller is also controlled the staggered work of N road power brachium pontis, and in the time that the power output of power conversion circuit is less than the 3rd threshold value, controls at least one road power brachium pontis and quit work.The 3rd threshold value can be greater than first threshold, also can be less than first threshold, and embodiments of the invention are not construed as limiting this.When the power output that should be understood that power conversion circuit is less than the 3rd threshold value, the load of power conversion circuit is underloading.
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 160 is output, power conversion circuit 100 is inverter circuit.On the contrary, when the second terminal 160 is input, when the first terminal 110 is output, power conversion circuit 100 is rectification circuit.
According to the embodiment of the present invention, controller 150 also, in the time that the power output of described power conversion circuit is greater than Second Threshold, is controlled at least one first switch 130 closure, and controls at least one road power brachium pontis 120 and work.
For example, in the time that the power output of power conversion circuit 100 is greater than Second Threshold, controller 150 can be controlled M the first switch 130 closures, and can control the M road power brachium pontis work being connected with M the first switch 130 in N road power brachium pontis 120.Here in the time that the power output of power conversion circuit 100 is greater than Second Threshold, can think that power conversion circuit 100 is to move in normally loaded situation.In other words, when power conversion circuit 100 from underloading restoring running when moving in normally loaded situation, controller 150 can be controlled M the first switch 130 closures, and can control the staggered work of the M road power brachium pontis being connected respectively with M the first switch 130 in N road power brachium pontis 120, to reduce extra power loss, improve the efficiency of power conversion circuit.
According to the embodiment of the present invention, controller 150 is also in the time that the power output of power conversion circuit 100 is between first threshold and Second Threshold, part the first switch of controlling at least one first switch 130 disconnects, and control quits work with the power brachium pontis that part the first switch is connected respectively.
For example, in the time that the power output of power conversion circuit 100 is between first threshold and Second Threshold, K first switch that controller 150 can be controlled in M the first switch 130 disconnects, and can control the power brachium pontis being connected with part the first switch and quit work.In other words, in the time that the load of power conversion circuit 100 is between underloading and normal load, controller 150 can be controlled M the part switch in the first switch 130 and disconnect, and controlling the power brachium pontis being connected respectively with this part switch disconnecting quits work, thereby reduce extra power loss, improve the efficiency of power conversion circuit, made the control of power conversion circuit more flexible simultaneously.
Should be understood that according to embodiments of the invention, at least one first switch of the present invention can be, but not limited to any combination of contactor, relay, MOSFET, IGBT, IGCT or SCR constant power device or different capacity device.
Embodiments of the invention adopt above-mentioned intelligent sleep mode to carry out the power brachium pontis work of power ratio control translation circuit, by add switching device between power brachium pontis and corresponding coupling inductance winding, the break-make of control switch device in the situation that of different output power, to realize the intelligent sleep mode of the Partial Power module under different capacity grade, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
The embodiment of the present invention for convenience of description, as an example of three power brachium pontis example, the technical scheme of the embodiment of the present invention is described in detail, but the embodiment of the present invention is not limited in this.
Fig. 2 shows the schematic block diagram of the power conversion circuit 200 of another embodiment of the present invention.Power conversion circuit 200 shown in Fig. 2 is examples of the embodiment of Fig. 1.Power conversion circuit 200 as shown in Figure 2 comprises: three road power brachium pontis 220, the first switches 230, coupling inductance 240 and controllers 250.
Wherein, power brachium pontis 1, power brachium pontis 2 and power brachium pontis 3 are connected with direct current by the first terminal 210 of power conversion circuit 200; Coupling inductance 240, comprises three winding L 1, L2 and L3 being wound in a common core, and winding L 1, L2 and L3 are connected with alternating current by the second terminal 260 of power conversion circuit 200; The first switch 230, comprises the first switch Q1 and the first switch Q2.The first switch Q1 is connected between power brachium pontis 1 and winding L 1, and the first switch Q2 is connected between power brachium pontis 2 and winding L 2, and wherein, power brachium pontis 3 is directly connected with winding L 3; Controller 150, be used for controlling the staggered work of three road power brachium pontis 220, and in the time that the power output of power conversion circuit 200 is less than first threshold, controls the first switch 230 and disconnect, and the power brachium pontis being connected respectively with the first switch 230 in control three road power brachium pontis 220 quits work.
Particularly, in the time that the power output of power conversion circuit 200 is less than first threshold, controller 250 can be controlled the first switch Q1 and the first switch Q2 and disconnect, and can control the power brachium pontis 1 being connected with the first switch Q1 in three road power brachium pontis 220 and quit work with the power brachium pontis 2 being connected with the first switch Q2.
Particularly, in the time that the power output of power conversion circuit 200 is greater than Second Threshold, controller 250 can be controlled the first switch Q1 and the first switch Q2 closure, and can control the power brachium pontis 1 being connected with the first switch Q1 in three road power brachium pontis 220 and work with the power brachium pontis 2 being connected with the first switch Q2.
Particularly, in the time that the power output of power conversion circuit 200 is between first threshold and Second Threshold, first switch that controller 250 can be controlled in the first switch Q1 and the first switch Q2 disconnects, and can control the power brachium pontis being connected with the first switch disconnecting and quit work.For example: controller 250 can be controlled the first switch Q2 and disconnect, and can control the power brachium pontis 2 being connected with the first switch Q2 and quit work.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, make the electric current that the winding of coupling inductance induces can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
Alternatively, as another embodiment of the present invention, coupling inductance also comprises: at least one voltage clamping device, at least one voltage clamping device is connected across respectively the two ends of at least one winding, for overvoltage protection is carried out at least one winding two ends.
Fig. 3 shows the schematic block diagram of the power conversion circuit 300 of another embodiment of the present invention.Power conversion circuit 300 as shown in Figure 3, comprising: N road power brachium pontis 320, at least one first switch 330, coupling inductance 340 and controller 350.Power conversion circuit 300 is similar with the power conversion circuit 100 of Fig. 1, suitably omits detailed description at this.
The coupling inductance 340 of the power conversion circuit 300 of Fig. 3 also comprises: 345 of at least one voltage clampings are connected across respectively the two ends of at least one winding, for overvoltage protection is carried out at least one winding two ends.
According to the embodiment of the present invention, at least one first switch 330 can comprise M the first switch, and wherein, M is the integer that is less than N.M winding in the N that coupling inductance 340 a comprises winding is connected with the M road power brachium pontis in the power brachium pontis of N road by M the first switch respectively, and all the other N-M winding is directly connected with power brachium pontis Zhong N-M road, N road power brachium pontis respectively.At least one voltage clamping device 345 can comprise M voltage clamping device, and M voltage clamping device is connected across respectively the two ends of M winding, for overvoltage protection is carried out in M winding two ends.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, make the electric current that the winding of coupling inductance induces can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
In addition, because the first switch can produce higher voltage in the winding in coupling inductance when the closed and disconnected, therefore, voltage clamping device is connected across to winding two ends can carry out overvoltage protection to winding, avoids winding to burn because of too high voltage.
According to the embodiment of the present invention, at least one voltage clamping device 345 comprises the one in piezo-resistance, Transient Voltage Suppressor and voltage stabilizing didoe, or the combination in any of piezo-resistance, Transient Voltage Suppressor and voltage stabilizing didoe.
The embodiment of the present invention for convenience of description, as an example of three power brachium pontis example, the technical scheme of the embodiment of the present invention is described in detail, but the embodiment of the present invention is not limited in this.
Fig. 4 shows the schematic block diagram of the power conversion circuit 400 of another embodiment of the present invention.Power conversion circuit 400 shown in Fig. 4 is examples of the embodiment of Fig. 3.Power conversion circuit 400 as shown in Figure 4 comprises: three road power brachium pontis 420, the first switch 430, coupling inductance 440, controller 450 and voltage clamping device 445.
Wherein, power brachium pontis 1, power brachium pontis 2 and power brachium pontis 3 are connected with direct current by the first terminal 410 of power conversion circuit 400; Coupling inductance 440, comprises three winding L 1, L2 and L3 being wound in a common core, and winding L 1, L2 and L3 are connected with alternating current by the second terminal 460 of power conversion circuit 400; The first switch 430, comprises the first switch Q1 and the first switch Q2.The first switch Q1 is connected between power brachium pontis 1 and winding L 1, and the first switch Q2 is connected between power brachium pontis 2 and winding L 2, and wherein, power brachium pontis 3 is directly connected with winding L 3; Controller 450, be used for controlling the staggered work of three road power brachium pontis 420, and in the time that the power output of power conversion circuit 400 is less than first threshold, controls the first switch 430 and disconnect, and the power brachium pontis being connected with the first switch 430 in control three road power brachium pontis 420 quits work; Voltage clamping device 445, comprises voltage clamping device K1 and voltage clamping device K2.K1 is connected across the two ends of winding L 1, and K2 is connected across the two ends of winding L 2, for overvoltage protection is carried out in the two ends of winding L1 and L2.
For example: in the time that the power output of power conversion circuit 400 is less than first threshold; controller 450 is controlled the moment of the first switch Q1 and the first switch Q2 disconnection; on the winding L 1 being connected with power brachium pontis 1 and power brachium pontis 2 respectively in coupling inductance 440 and L2, can produce higher voltage; now; voltage clamping device K1 and the K2 at two ends that need to be by being connected across respectively winding L 1 and L2 carry out overvoltage protection to the two ends of winding L1 and L2, avoid winding L 1 and L2 to be burnt because of overtension.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, make the electric current that the winding of coupling inductance induces can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
In addition, because the first switch can produce higher voltage in the winding in coupling inductance when the closed and disconnected, therefore, voltage clamping device is connected across to winding two ends can carry out overvoltage protection to winding, avoids winding to burn because of too high voltage.
Alternatively, as another embodiment of the present invention, power varying circuit also comprises: second switch, is connected between coupling inductance and the second terminal, for power conversion circuit being connected to electrical network under the control of controller or disconnecting from electrical network.
Fig. 5 shows the schematic block diagram of the power conversion circuit 500 of another embodiment of the present invention.Power conversion circuit 500 as shown in Figure 5, comprising: N road power brachium pontis 520, at least one first switch 530, coupling inductance 540 and controller 550.Power conversion circuit 500 is similar with the power conversion circuit 100 of Fig. 1, suitably omits detailed description at this.
The power conversion circuit 500 of Fig. 5 also comprises: second switch 570, is connected between coupling inductance 540 and the second terminal 560, for power conversion circuit 500 being connected under the control at controller 550 to electrical network or disconnecting from electrical network.
According to the embodiment of the present invention, second switch is connected between coupling inductance 540 and the second terminal 560, when controller 550 is according to the closed of the output power M of power conversion circuit 500 the first switch 530 or before disconnecting, controller 550 will be controlled second switch and realize power conversion circuit 500 and be connected to electrical network or disconnect from electrical network.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, make the electric current that the winding of coupling inductance induces can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
According to the embodiment of the present invention, in the time that the power output of power conversion circuit 500 is less than first threshold, controller 550 can be controlled second switch and disconnect, power conversion circuit 500 is disconnected from electrical network, control again M the first switch 530 and disconnect, and can control the M road power brachium pontis being connected with M the first switch 530 in N road power brachium pontis 520 and quit work.
According to the embodiment of the present invention, in the time that the power output of power conversion circuit 500 is greater than Second Threshold, controller 550 can be controlled second switch closure, make power conversion circuit 500 be connected to electrical network, control again M the first switch 530 closures, and can control the M road power brachium pontis work being connected with M the first switch 530 in N road power brachium pontis 520.
Particularly, according to the embodiment of the present invention, in the time that the power output of power conversion circuit 500 is between first threshold and Second Threshold, part the first switch that controller 550 can be controlled in M the first switch 530 disconnects, and can control the power brachium pontis being connected with part the first switch and quit work.
The embodiment of the present invention for convenience of description, as an example of two power brachium pontis example, the technical scheme of the embodiment of the present invention is described in detail, for the power conversion circuit of two power brachium pontis, the threshold value of its power output is one, that is: first threshold equals Second Threshold, but the embodiment of the present invention is not limited in this, more threshold value also can be set.
Fig. 6 is the schematic block diagram of power conversion circuit 600 according to another embodiment of the present invention.Power conversion circuit 600 shown in Fig. 6 is examples of the embodiment of Fig. 5.Power conversion circuit 600 comprises: two-way power brachium pontis 620, the first switch Q1, coupling inductance 640, controller 650 and second switch 670.Two-way power brachium pontis 620 is power brachium pontis 1 and 2, and coupling inductance 640 comprises the winding L 1 and the L2 that are wound on same magnetic core.The first switch Q1 is connected between power brachium pontis 1 and winding L 1, and power brachium pontis 2 is directly connected with winding L 2.
In the time that the power output of described power conversion circuit 600 is less than first threshold, controller 650 can be controlled second switch 670 and disconnect, power conversion circuit 600 is disconnected from electrical network, control again the first switch Q1 and disconnect, and can control the power brachium pontis 1 being connected with the first switch Q1 in two-way power brachium pontis 620 and quit work.
In the time that the power output of described power conversion circuit 600 is greater than first threshold, controller 650 can be controlled second switch 670 closures, make power conversion circuit 600 be connected to electrical network, control again the first switch Q1 closure, and can control the power brachium pontis 1 being connected with the first switch Q1 in two-way power brachium pontis 620 and work.
Alternatively, according to the embodiment of the present invention, coupling inductance 640 can also comprise: a voltage clamping device (not shown), a voltage clamping device is connected across the two ends of winding L 1, for overvoltage protection is carried out in winding L1 two ends.
Alternatively, as another embodiment of the present invention, power varying circuit also comprises: filter circuit, filter circuit is connected between coupling inductance and the second terminal, for alternating current is carried out to filtering.
Fig. 7 shows the schematic block diagram of the power conversion circuit 700 of another embodiment of the present invention.Power conversion circuit 700 as shown in Figure 7, comprising: N road power brachium pontis 720, at least one first switch 730, coupling inductance 740 and controller 750.Power conversion circuit 700 is similar with the power conversion circuit 100 of Fig. 1, suitably omits detailed description at this.
The power conversion circuit 700 of Fig. 7 also comprises: filter circuit 780, is connected between coupling inductance 740 and the second terminal 760, for alternating current is carried out to filtering.
According to the embodiment of the present invention, filter circuit can be electric capacity, and embodiments of the invention are not limited to this, and for example, filter circuit 780 can be also the LC filter circuit that is made up of inductance and electric capacity or the filter circuit of other form.
Should be understood that filter circuit 780 is connected with AC power (not shown) in the time that power conversion circuit 700 is rectifier, filter circuit 780 receives alternating current input.
Alternatively, according to the embodiment of the present invention, power conversion circuit 700 can comprise: second switch (not shown), this second switch can be connected between coupling inductance 740 and filter circuit 780, also can be connected between filter circuit 780 and the second terminal 760, the embodiment of the present invention is not limited in this.
Alternatively; according to the embodiment of the present invention; coupling inductance 740 can also comprise: at least one voltage clamping device (not shown), this at least one voltage clamping device is connected across respectively the two ends of at least one winding, for overvoltage protection is carried out at least one winding two ends.
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: the mutually more level power translation circuits 820 of A, the mutually more level power translation circuits 830 of B and the mutually more level power translation circuits 840 of C, and for carry out power conversion between three-phase alternating current and direct current.
Every phase power conversion circuit in the mutually more level power translation circuits 820 of A, the mutually more level power translation circuits 830 of B, the mutually more level power translation circuits 840 of C 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 electric capacity, comprise A phase capacitor C 1, B phase capacitor C 2 and C phase capacitor C 3, for being combined with the leakage inductance of the coupling inductance of power conversion circuit, three-phase alternating current is carried out to filtering, and one end of the each electric capacity in three electric capacity is connected with the second terminal of the 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 the each electric capacity in A phase capacitor C 1, B phase capacitor C 2 and C phase capacitor C 3.
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.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, the electric current that the winding of coupling inductance is induced flows through and can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power inverter.
Fig. 9 is the schematic block diagram of power conversion system 900 according to an embodiment of the invention.Power conversion system 900 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 power conversion circuit 300 as described in Figure 3, for direct current is transformed into alternating current.The second power conversion circuit can be power conversion circuit 500 as described in Figure 5, for alternating current is transformed into direct current.The input terminal of power conversion circuit 300 is connected with the lead-out terminal of power conversion circuit 500.In other words, the direct current output of the second power conversion circuit is connected to the first power conversion circuit direct current input, thereby realizes AC/AC conversion.
Should be understood that in the present embodiment, the first power conversion circuit and the second power conversion circuit controlled controller 350 and the controller 550 of being formed on respectively, also can be controlled by same controller 950.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, the electric current that the winding of coupling inductance is induced flows through and can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion system.
Figure 10 is the schematic block diagram of power conversion system 1000 according to another embodiment of the present invention.Power conversion system 1000 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 power conversion circuit 300 as described in Figure 3, for direct current is transformed into alternating current.The second power conversion circuit can be power conversion circuit 500 as described in Figure 5, for alternating current is transformed into direct current.The lead-out terminal of power conversion circuit 300 is connected with the input terminal of power conversion circuit 500.In other words, the interchange output of the first power conversion circuit is connected to the second power conversion circuit and exchanges input, thereby realizes DC/DC conversion.
Should be understood that in the present embodiment, the first power conversion circuit and the second power conversion circuit controlled controller 350 and the controller 550 of being formed on respectively, also can be controlled by same controller 1050.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, the electric current that the winding of coupling inductance is induced flows through and can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
Figure 11 is the schematic flow diagram of power converting method 1100 according to an embodiment of the invention.
Power converting method 1100 shown in Figure 11 comprises following content.
1110, the staggered work of the multichannel power brachium pontis of power ratio control translation circuit, wherein at least one road power brachium pontis in this multichannel power brachium pontis is connected by least one winding in multiple windings of at least one first switch and the coupling inductance of this power conversion circuit.
1120, in the time that the power output of this power conversion circuit is less than first threshold, controls this at least one first switch and disconnect.
According to the embodiment of the present invention, power converting method 1100 can be carried out by controller.Normally work at power inverter (load that is power inverter is normal), controller can be controlled the staggered work of multichannel power brachium pontis, and wherein at least one road power brachium pontis in this multichannel power brachium pontis is connected by least one winding in multiple windings of at least one first switch and the coupling inductance of this power conversion circuit.In the time that the power output of power conversion circuit is less than first threshold, when the load of power conversion circuit is underloading, controller can be controlled this at least one first switch and disconnect.Correspondingly, controller can also be controlled at least one road power brachium pontis and quit work, for example: can be in the time that the power output of power conversion circuit is less than first threshold, controlling at least one road power brachium pontis quits work, also can be in the time that the power output of power conversion circuit be less than another threshold value, control at least one road power brachium pontis and quit work.In other words, disconnect and control the out-of-work threshold value of at least one road power brachium pontis can also can be for different threshold values for same threshold value for controller control the first switch.Out-of-work this at least one road power brachium pontis is and the power brachium pontis of the corresponding connection of this at least one switch disconnecting.
According to embodiments of the invention, can be in the time that the power output of power conversion circuit be less than default threshold value, the switch that control is arranged between power brachium pontis and the winding of coupling inductance disconnects, the electric current that the winding of coupling inductance is induced flows through and can not flow through the diode in parallel with power brachium pontis, thereby reduce extra power loss, improved the efficiency of power conversion circuit.
Alternatively, as another embodiment of the present invention, power converting method 1100 also comprises: in the time that the power output of power conversion circuit is less than first threshold, controls at least one road power brachium pontis and quit work.
According to the embodiment of the present invention, in the time that the power output of power conversion circuit is less than first threshold, be the load of power conversion circuit while being underloading, controller can be controlled at least one road power brachium pontis at least one first switch disconnects and quit work controlling.
Alternative, as another embodiment, controller, in the time that the power output of power conversion circuit is less than first threshold, is controlled at least one first switch and is disconnected, in the time that the power output of power conversion circuit is less than the 3rd threshold value, controls at least one road power brachium pontis and quit work.The 3rd threshold value can be greater than first threshold, also can be less than first threshold, and embodiments of the invention are not construed as limiting this.When the power output that should be understood that power conversion circuit is less than the 3rd threshold value, the load of power conversion circuit is underloading.
Alternatively, as another embodiment of the present invention, power converting method 1100 also comprises: in the time that the power output of this power conversion circuit is greater than Second Threshold, control this at least one first switch closure, and control the staggered work of this at least one road power brachium pontis.
According to the embodiment of the present invention, in the time that the power output of power conversion circuit is greater than Second Threshold, can think that power inverter moves in normally loaded situation, controller can be controlled this at least one first switch closure, and can control the staggered work of this at least one road power brachium pontis that at least one first switch is connected respectively with this, to reduce extra power loss, improve the efficiency of power conversion circuit.
Alternatively, as another embodiment of the present invention, power converting method 1100 also comprises: in the time that the power output of this power conversion circuit is between this first threshold and this Second Threshold, part the first switch of controlling in this at least one first switch disconnects, and the power brachium pontis that control is connected with this part first switch quits work.
According to the embodiment of the present invention, in the time that the power output of power conversion circuit is between this first threshold and this Second Threshold, can think that the load of power conversion circuit is between underloading and normal load, a part of switch that controller can be controlled at least one first switch disconnects, and controlling the power brachium pontis being connected respectively with this part switch disconnecting quits work, thereby reduce extra power loss, improve the efficiency of power conversion circuit, made the control of power conversion circuit more flexible simultaneously.
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 skill in the art can carry out to embodiments of the invention amendment or the replacement of various equivalences, and these amendments or replacement all should be in covering scopes of the present invention.
Claims (18)
1. a power conversion circuit, is characterized in that, comprising:
Multichannel power brachium pontis, is connected with direct current by the first terminal of described power conversion circuit;
Coupling inductance, comprises multiple windings, is connected with alternating current by the second terminal of described power conversion circuit;
At least one first switch, is connected between at least one winding at least one road power brachium pontis and the described multiple winding in the power brachium pontis of described N road;
Controller, in the time that the power output of described power conversion circuit is less than first threshold, controls described at least one first switch and disconnects.
2. power conversion circuit according to claim 1, it is characterized in that, described controller is also controlled the staggered work of described multichannel power brachium pontis, and in the time that the power output of described power conversion circuit is less than described first threshold, controls described at least one road power brachium pontis and quit work.
3. power conversion circuit according to claim 2, it is characterized in that, described controller also, in the time that the power output of described power conversion circuit is greater than Second Threshold, is controlled described at least one first switch closure, and is controlled described at least one road power brachium pontis work.
4. power conversion circuit according to claim 3, it is characterized in that, described controller is also in the time that the power output of described power conversion circuit is between described first threshold and described Second Threshold, part the first switch of controlling in described at least one first switch disconnects, and control quits work with the power brachium pontis that described part the first switch is connected.
5. according to the power conversion circuit described in any one in claim 1-4; it is characterized in that; described coupling inductance also comprises: at least one voltage clamping device; described at least one voltage clamping device is connected across respectively the two ends of described at least one winding, for overvoltage protection is carried out in described at least one winding two ends.
6. power conversion circuit according to claim 5, it is characterized in that, described at least one voltage clamping device comprises the one in piezo-resistance, Transient Voltage Suppressor and voltage stabilizing didoe, or the combination in any of described piezo-resistance, Transient Voltage Suppressor and voltage stabilizing didoe.
7. according to the power conversion circuit described in any one in claim 1-6, it is characterized in that, also comprise: second switch, is connected between described coupling inductance and described the second terminal, for described power conversion circuit being connected to electrical network under the control of described controller or disconnecting from described electrical network.
8. according to the power conversion circuit described in any one in claim 1-7, it is characterized in that, described at least one first switch is one of contactor, relay, metal oxide layer semiconductor field effect transistor M OSFET, insulated gate bipolar transistor IGBT, integrated gate commutated thyristor IGCT and silicon controlled rectifier SCR, or described at least one first switch is the combination in any of contactor, relay, MOSFET, IGBT, IGCT and SCR.
9. according to the power conversion circuit described in any one in claim 1-8, described the first terminal is one of described power conversion circuit input and output, another in input and output that described the second terminal is described power conversion circuit.
10. according to the power conversion circuit described in any one in claim 1-9, it is characterized in that, also comprise: filter circuit, described filter circuit is connected between described coupling inductance and described the second terminal, for described alternating current is carried out to filtering.
11. 1 kinds of three-phase power converters, is characterized in that, comprising:
Three phase power translation circuit, for carry out power conversion between three-phase alternating current and direct current, wherein every phase power conversion circuit comprises according to the power conversion circuit described in any one in claim 1-9.
12. three-phase power converters according to claim 11, is characterized in that, also comprise: three electric capacity, are connected with the coupling inductance of described three phase power translation circuit respectively, for described three-phase alternating current is carried out to filtering.
13. three-phase power converters according to claim 12, 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.
14. 1 kinds of power conversion systems, is characterized in that, comprising: the first power conversion circuit and the second power conversion circuit,
Wherein said the first power conversion circuit is according to the power conversion circuit described in any one in claim 1-13, for direct current is transformed into alternating current, the first terminal of wherein said the first power conversion circuit is the input terminal of the first power conversion circuit, and the second terminal of described the first power conversion circuit is the lead-out terminal of described the first power conversion circuit;
Described the second power conversion circuit is according to the power conversion circuit described in any one in claim 1-13, for alternating current is transformed into direct current, wherein, the second terminal of described the second power conversion circuit is the input terminal of the second power conversion circuit, the first terminal of described the second power conversion circuit is the lead-out terminal of the second power conversion circuit, 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.
15. 1 kinds of power converting methods, is characterized in that, comprising:
The staggered work of the multichannel power brachium pontis of power ratio control translation circuit, at least one road power brachium pontis in wherein said multichannel power brachium pontis is connected by least one winding in multiple windings of at least one first switch and the coupling inductance of described power conversion circuit;
In the time that the power output of described power conversion circuit is less than first threshold, controls described at least one first switch and disconnect.
16. power converting methods according to claim 15, is characterized in that, also comprise:
In the time that the power output of described power conversion circuit is less than first threshold, controls described at least one road power brachium pontis and quit work.
17. power converting methods according to claim 16, is characterized in that, also comprise:
In the time that the power output of described power conversion circuit is greater than Second Threshold, controls described at least one first switch closure, and control described at least one road power brachium pontis work.
18. power converting methods according to claim 17, is characterized in that, also comprise:
In the time that the power output of described power conversion circuit is between described first threshold and described Second Threshold, part the first switch of controlling in described at least one first switch disconnects, and control quits work with the power brachium pontis that described part the first switch is connected.
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| CN112448605A (en) * | 2021-02-01 | 2021-03-05 | 深圳英飞源技术有限公司 | Inverter circuit based on coupling transformer |
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