CN102244476A - Inverter circuit - Google Patents
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- CN102244476A CN102244476A CN2011101960048A CN201110196004A CN102244476A CN 102244476 A CN102244476 A CN 102244476A CN 2011101960048 A CN2011101960048 A CN 2011101960048A CN 201110196004 A CN201110196004 A CN 201110196004A CN 102244476 A CN102244476 A CN 102244476A
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Abstract
The invention provides an inverter circuit, comprising a switching circuit including a first switch branch and a second switch branch, a first freewheeling unit and a second freewheeling unit, wherein the switching circuit is used for receiving and converting DC (Direct Current) electrical energy and outputting an AC (Alternating Current) modulating voltage between first and second output ends, the first switch branch is made up of first to third switch elements which are electrically connected in series and is connected to the first output end electrically, and the second switch branch is made up of fourth to sixth switch elements which are electrically connected in series and is connected to the second output end; the first freewheeling unit is electrically connected with the first and the second switch elements and the second output end and used for providing a freewheeling path from the second output end to the first and the second switch elements; and the second freewheeling unit is connected with the fourth and the fifth switch elements and the first output end electrically and used for providing a freewheeling path from the first output end to the fourth and the fifth switch elements. According to the inverter circuit disclosed by invention, the converting efficiency can be promoted, the producing cost is reduced, the occurrence of leakage currents is prevented and the risk of injuring human bodies and devices is further reduced.
Description
Technical field
The present invention relates to a kind of inverter circuit, relate in particular to a kind of conversion efficiency that promotes, reduce production cost, and prevent the inverter circuit of leakage current generating.
Background technology
The human at present main energy sources of using is oil, produce required power or electric energy by burning petroleum, for example automobile or fuel oil type generator (factory), yet, high temperature that produces in the oil combustion process and waste gas more can make Global Greenhouse Effect worsen except meeting causes the air quality deterioration.In addition, according to whole world Petroleum Production statistics, oil production rate will peak in 10 years; thereafter output will reduce year by year; this means that not only oil price (comprising electricity price) will be no longer cheap, also may cause the arrival of real oil crisis, causes the global economy storm indirectly.
In view of this, the renewable energy resources (renewable energy) are converted to general people's livelihood power supply or machine power efficient and cost-effective, have become the important industry development policies that sophisticated technologies country takes into account environmental protection and generating.In the renewable energy resources such as solar energy, wind energy, tidal energy, geothermal energy, biological waste energy, utilize the renewable source of energy generation system of solar power generation, because have environmental protection, be easy to install, the maturation of commercialized technology and the auxiliary promotion of state plan, become the main selection of advanced country development decentralized power supply system.
See also Fig. 1, it is the circuit diagram of known inverter circuit.As shown in Figure 1, known inverter circuit 1 is applied to the sunlight grid-connected system, therefore also can be described as photovoltaic DC-to-AC converter (Photovoltaic Inverter, PV inverter), inverter circuit 1 is the circuit framework of non-isolation and full-bridge type, mainly be made of an input filter circuit 10, a full-bridge type commutation circuit 11 and an output filter circuit 12, wherein input filter circuit 10 is by one first capacitor C
1Constitute, in order to receive DC input voitage V by solar panels produced
DC, and to DC input voitage V
DCCarry out filtering.11 of full-bridge type commutation circuits and output filter circuit 12 electrically connect, and by first to fourth switch element S
1-S
4Constitute the first switch element S
1And second switch element S
2Series connection electrically connects, the 3rd switch element S
3And the 4th switch element S
4Also series connection electrically connects, and forms the full-bridge framework of two brachium pontis formulas whereby, first to fourth switch element S
1-S
4By the switchover operation that the control of a control unit (not shown) is carried out conducting or ended, make full-bridge type commutation circuit 11 whereby with filtered DC input voitage V
DCBe converted to AC regulating voltage V
T12 of output filter circuits and full-bridge type commutation circuit 11 electrically connect, and by one first inductance L
1, one second inductance L
2And one second filter capacitor C
2Constitute, output filter circuit 12 is in order to filtering AC regulating voltage V
TThe high frequency composition, and then export an ac output voltage Vo to electric power networking (Grid) G.
Generally speaking, first to fourth switch element S of full-bridge type commutation circuit 11
1-S
4With the pulse width modulation operation, and according to first to fourth switch element S
1-S
4The difference of mode of operation also can be divided into bipolarity and switch (Bipolar) or unipolarity switching (Unipolar), wherein, when full-bridge type commutation circuit 11 adopts unipolar switching working mode to move, because two switch elements that each switch only has single brachium pontis when switching to be comprised are carrying out the action that high frequency switches, make AC regulating voltage V
TOnly 0 on the occasion of DC input voitage V
DCBetween or at 0 DC input voitage V to negative value
DCBetween do change, therefore when adopting the operation of bipolarity switching working mode, first to fourth switch element S
1-S
4The action that high frequency switches makes AC regulating voltage V
TWhen positive half cycle or negative half period, on the occasion of DC input voitage V
DCDC input voitage V to negative value
DCBetween do change, full-bridge type commutation circuit 11 adopts the switch cost that unipolar switching working mode had to lack than employing bipolarity switching working mode, in other words, be that efficient is higher, therefore comparatively meet at present energy-conservation the strictly regulating of electric equipment, yet when full-bridge type commutation circuit 11 adopts unipolar switching working mode to move, because the addition mean value that the positive output end of full-bridge type commutation circuit 11 and negative output terminal switch time point for the more any relative voltage in the inverter circuit 1 in office there is no method and keeps a fixed value, causes producing DC input voitage V
DCSolar panels over the ground between existing parasitic capacitance Cp produce tangible voltage variety, and then produce leakage current and harmful to human and equipment.
See also Fig. 2, it is the circuit diagram of another kind of known inverter circuit.As shown in Figure 2, this inverter circuit 2 adopts neutral-point-clamped (Neutral Point Clamped) circuit framework, be also referred to as the NPC inverter, this inverter circuit 2 has an input filter circuit 20, and switches circuit 21 and output filter circuit 22, wherein the annexation of input filter circuit 20 and output filter circuit 22 is similar to input filter circuit 10 and output filter circuit 12 shown in Figure 1 to function, therefore repeats no more in this.Commutation circuit 21 is closed element S by first switch element to the twelvemo
1～S
12Constitute first switch element to the, six switch element S wherein
1～S
6Constitute one first switching branches of neutral-point-clamped circuit framework, minion is closed element to the twelvemo and is closed element S
7～S
12Also constitute a second switch branch road of point of neutralization clamping circuit framework.
When inverter circuit 2 is applied to the sunlight grid-connected system, close element S by first switch element to the twelvemo that constitutes the neutral-point-clamped circuit framework
1～S
12Conducting to each other or by the action, solar panels over the ground between existing parasitic capacitance Cp can't produce tangible voltage variety, so can prevent the generation of leakage current, yet owing to comprise 12 switch elements in the inverter circuit 2, the production cost that causes inverter circuit 2 is comparatively expensive, what is more since inverter circuit 2 by 12 switch elements in the operation of carrying out conducting or ending, therefore will cause loss to increase, reduce the conversion efficiency of inverter circuit 2.
Therefore how to develop a kind of above-mentioned known technology defective of improving, and can promote efficient simultaneously, reduce production cost and reduce the inverter circuit of leakage current generating, real in pressing for the problem of solution at present.
Summary of the invention
Main purpose of the present invention is for providing a kind of inverter circuit, when being applied to the sunlight grid-connected system to solve known inverter circuit, having the not good and cost of leakage current generating, conversion efficiency and crosses high defective.
For reaching above-mentioned purpose, better embodiment of the present invention is for providing a kind of inverter circuit, framework is in direct current energy is converted to AC energy, comprise: commutation circuit, framework be in receiving direct current energy, and change, and between first and 1 second output the output AC modulation voltage, and comprise: first switching branches, comprise first to the 3rd switch element that series connection in regular turn electrically connects, electrically connect first output between second and third switch element; And the second switch branch road, electric connection in parallel with first switching branches, and comprise the 4th to the 6th switch element that series connection in regular turn electrically connects, electrically connect second output between the 5th and the 6th switch element; The first afterflow unit, one end are electrically connected between first and second switch element, and the other end electrically connects second output; And the second afterflow unit, the one end is electrically connected between the 4th and the 5th switch element, and the other end electrically connects first output; Wherein, when positive half cycle, the simultaneously and constantly conducting or of the first and the 6th switch element by switching, the second switch element is a conducting state, when negative half period, change by the simultaneously and constantly conducting or by switching, the 5th switch element is a conducting state of the 3rd and the 4th switch element.
Inverter circuit of the present invention is arranged in pairs or groups mutually by first switch element to the, six switch elements, the first afterflow unit and the second afterflow unit, can promote conversion efficiency, reduce production cost, and prevent the generation of leakage current, and then the risk of harm reduction human body and equipment.
Description of drawings
Fig. 1: it is the circuit diagram of known inverter circuit.
Fig. 2: it is the circuit diagram of another kind of known inverter circuit.
Fig. 3: it is the circuit diagram of the inverter circuit of preferred embodiment of the present invention.
Fig. 4 A: it is the voltage of Fig. 3 and the sequential schematic diagram of control signal.
Fig. 4 B: it is the oscillogram of the AC regulating voltage of Fig. 3.
Fig. 5 A: it is the electrical block diagram of control unit shown in Figure 3.
Fig. 5 B: it is the sequential schematic diagram of voltage shown in Fig. 5 A and control signal.
Fig. 6 A: it is that another of control unit shown in Figure 3 changes the electrical block diagram of example.
Fig. 6 B: it is the voltage of Fig. 6 A shown in showing and the sequential schematic diagram of control signal.
Fig. 7: it is that one of inverter circuit shown in Figure 3 changes example.
Fig. 8 A: it is the electrical block diagram of control unit shown in Figure 7.
Fig. 8 B: be the sequential schematic diagram of part voltage shown in Fig. 8 A and control signal.
Description of reference numerals in the above-mentioned accompanying drawing is as follows:
1,2,3: inverter circuit
10,20,30: input filter circuit
11: the full-bridge type commutation circuit
12,22,32: output filter circuit
21,31: commutation circuit
310: the first afterflow unit
311: the second afterflow unit
312: the first switching branches
313: the second switch branch road
33: control unit
330～332: first～the 3rd comparator
333: not gate
630～632: first～the 3rd comparator
633: the first not gates
634～635: the first～the second with the door
636: rectifying device
830～831: the first～the second not gate
The the 832～833: the 3rd～the 4th with the door
636: rectifying device
8: flow directing device
9: AC load
C
1: first electric capacity
C
2: second electric capacity
Cp: parasitic capacitance
L
1: first inductance
L
2: second inductance
Vo: ac output voltage
V
DC: DC input voitage
V
T: AC regulating voltage
Vc1～Vc8: first to the 8th control signal
V
1～V
2: the first～the second string ripple signal
V
AN～V
BN: the first～the second relative voltage
V
3: string ripple signal
V
4: rectification string ripple signal
V
TRI: triangular signal
Vr: specific voltage value
G: electric power networking
S
1～S
12: first to twelvemo pass element
A: first output
B: second output
N: be total to contact
D
1～D
2: first fly-wheel diode～second fly-wheel diode
T
1～T
2: the first～the second time
Embodiment
Some exemplary embodiments that embody feature of the present invention and advantage will be described in detail in the explanation of back segment.Be understood that the present invention can have various variations on different modes, yet it does not depart from the scope of the present invention and explanation wherein and the accompanying drawing usefulness that ought explain in itself, but not in order to restriction the present invention.
See also Fig. 3, it is the circuit diagram of the inverter circuit of preferred embodiment of the present invention.As shown in Figure 3, inverter circuit 3 can be but is not limited to be applied to the sunlight grid-connected system, and is non-isolated circuit framework, and it receives a direct current device 8, solar panels for example, the DC input voitage V that is produced
DC, and be converted to ac output voltage Vo, to provide to an AC load 9, for example ac electric apparatus equipment or civil power network system etc.
In present embodiment, the first switch element S
1, second switch element S
2And the 3rd switch element S
3Series connection in regular turn electrically connects and constitutes first switching branches 312, and the first switch element S
1An end and the anode of the anode of flow directing device 8 and input filter circuit 30 electrically connect the 3rd switch element S
3An end and the negative terminal of the negative terminal of flow directing device 8 and input filter circuit 30 electrically connect, in addition, second switch element S
2And the 3rd switch element S
3Between connect first output terminals A.The 4th switch element S
4, the 5th switch element S
5And the 6th switch element S
6Series connection in regular turn electrically connects and constitutes second switch branch road 313 with 312 electric connections in parallel of first switching branches and the 4th switch element S
4An end and the anode of the anode of flow directing device 8 and input filter circuit 30 electrically connect the 6th switch element S
6An end then electrically connect with the negative terminal of the negative terminal of flow directing device 8 and input filter circuit 30, in addition, the 5th switch element S
5And the 6th switch element S
6Between electrically connect the second output B.
One end of the first afterflow unit 310 is electrically connected at the first switch element S
1And second switch element S
2Between, the other end of the first afterflow unit 310 then is electrically connected at the second output B, and the first afterflow unit 310 is in order to provide by second output B to the first switch element S
1With second switch element S
2Between an afterflow path.One end of the second afterflow unit 311 is electrically connected at the 4th switch element S
4And the 5th switch element S
5Between, the other end of the second afterflow unit 311 then is electrically connected at first output terminals A, and the second afterflow unit 311 is in order to provide by first output terminals A to the, four switch element S
4With the 5th switch element S
5Between another afterflow path.
In the foregoing description, the first afterflow unit 310 is by first sustained diode
1Constitute, the second afterflow unit 311 is by second sustained diode
2Constitute, wherein, first sustained diode
1Cathode terminal be electrically connected at the first switch element S
1And second switch element S
2Between, first sustained diode
1Anode tap then be electrically connected at the second output B, second sustained diode
2Cathode terminal be electrically connected at the 4th switch element S
4And the 5th switch element S
5Between, second sustained diode
2Anode tap then be electrically connected at first output terminals A.
The control unit 33 and first to the 6th switch element S
1-S
6Control end electrically connect, it produces first to the 6th control signal Vc1～V of pulse width modulation form
C6Control first to the 6th switch element S respectively
1-S
6Conducting or the switching that ends.
Below the manner of execution of inverter circuit shown in Figure 33 will be described exemplarily.See also Fig. 4 A and Fig. 4 B, and cooperate Fig. 3, wherein Fig. 4 A and Fig. 4 B are respectively voltage and the sequential schematic diagram of control signal and the oscillogram of AC regulating voltage of Fig. 3.Shown in Fig. 3, Fig. 4 A and Fig. 4 B, when in positive half cycle, for example in 0～very first time T
1Between, the first control signal Vc1 and the 6th control signal Vc6 change in the mode of pulse width modulation, i.e. and forbidden energy level (disabled) and enable the mutual variation of level (eanbled) is so the first switch element S
1And the 6th switch element S
6Simultaneously and carry out conducting constantly or by switching, in addition, the 3rd control signal Vc3, the 4th control signal Vc4 and the 5th control signal Vc5 then continue to be maintained the forbidden energy level, so the 3rd switch element S
3, the 4th switch element S
4With the 5th switch element S
5Be cut-off state, moreover, the second control signal Vc
2Then continue to be maintained and enable level, so second switch element S
2Be conducting state.
Therefore, when in positive half cycle and the first switch element S
1And the 6th switch element S
6During for conducting state, the electric current that flow directing device 8 the is exported first switch element S that flows through in regular turn
1, second switch element S
2, first inductance L
1, second capacitor C
2, second inductance L
2And the 6th switch element S
6So, conversion that the electric energy of the direct current form that flow directing device 8 is exported just can be by inverter circuit 3 and filtering and be sent to AC load 9, first inductance L simultaneously with form of communication
1And second inductance L
2Carry out energy storage, when in positive half cycle and the first switch element S
1And the 6th switch element S
6When switching to cut-off state, because the electric current continuation property of inductance, so first inductance L
1And second inductance L
2Stored energy just can be with the mode of electric current flow through in regular turn first afterflow unit 310 that the afterflow path is provided and the second switch element S that is conducting state
2, old friend's current load 9 also receives the electric energy that flow directing device 8 is exported sustainably.
When in negative half period, for example in very first time T
1～the second time T
2Between, the 3rd control signal Vc3 and the 4th control signal Vc4 change in the mode of pulse width modulation, i.e. and forbidden energy level and enable the mutual variation of level is so the 3rd switch element S
3And the 4th switch element S
4Simultaneously and carry out conducting constantly or by switching, in addition, the first control signal Vc1, the second control signal Vc
2And the 6th control signal V
C6Then change by continuing to maintain the forbidden energy level, so the first switch element S
1, second switch element S
2And the 6th switch element S
6Be cut-off state, moreover the 5th control signal Vc5 changes then by continuing to maintain and enables level, so the 5th switch element S
5Be conducting state.
Therefore, when in negative half period and the 3rd switch element S
3And the 4th switch element S
4During for conducting state, the electric current that flow directing device 8 is exported is flowed through in regular turn and the 4th is closed element S
4, the 5th switch element S
5, second inductance L
2, second capacitor C
2, first inductance L
1And the 3rd switch element S
3So, conversion that the electric energy of the direct current form that flow directing device 8 is exported just can be by inverter circuit 3 and filtering and be sent to AC load 9, first inductance L simultaneously with form of communication
1And second inductance L
2Carry out energy storage, when in negative half period and the 3rd switch element S
3And the 4th switch element S
4When switching to cut-off state, because the electric current continuation property of inductance, so first inductance L
1And second inductance L
2Stored energy just can be with the mode of electric current flow through in regular turn second afterflow unit 311 that the afterflow path is provided and the 5th switch element S that is conducting state
5, old friend's current load 9 also receives the electric energy that flow directing device 8 is exported sustainably.
Please consult Fig. 4 B again, by first switch element to the, six switch element S
1～S
6, the first afterflow unit 310 and the second afterflow unit 311 arrange in pairs or groups the AC regulating voltage V that commutation circuit 31 is exported mutually
TWhen positive half cycle 0 on the occasion of a specific voltage value Vr between do change, at negative half period then is to do change 0 between the specific voltage value Vr of negative value, so it is similar that the full-bridge type commutation circuit 11 of commutation circuit 31 actual manner of execution and known inverter circuit 1 shown in Figure 1 adopts unipolar switching working mode to move, so first to the 6th switch element S of inverter circuit of the present invention 3
1-S
6Switch cost during action can reduce, and then lifting conversion efficiency, in addition, as seen from the figure, first output terminals A of commutation circuit 31 and the second output B be respectively for the relative voltage of a specified point of inverter circuit 3 internal circuits, for example the first relative voltage V of the common contact N that electrically connects for the parasitic capacitance Cp (as shown in Figure 3) that is produced with flow directing device 8
ANAnd the second relative voltage V
BNBoth keep a fixed value by the in office one addition mean value that switches time point, so can't produce tangible voltage variety on the parasitic capacitance Cp, thus, just can reduce the generation of leakage current, and then the risk of harm reduction human body and equipment, what is more, 12 switch elements have been used compared to known inverter circuit 2 shown in Figure 2, inverter circuit 3 of the present invention has only used six Katyuan parts and two afterflow unit in the operation of carrying out conducting or ending, therefore not only reduce the production cost of inverter circuit 3, also reduce the loss that is caused when moving, and then promoted the conversion efficiency of inverter circuit 3 more because of switch element.
In the foregoing description, first to the 6th switch element S
1-S
6Can (Metal-Oxide-Semiconductor Field-Effect Transistor MOSFET) constitutes, but not as limit by mos field effect transistor.
In the foregoing description, the first control signal Vc1, the 3rd control signal Vc3, the 4th control signal Vc4 and the 6th control signal V
C6Be the pulse width modulating signal of high frequency, the second control signal Vc
2And the 5th control signal Vc5 then is the pulse width modulating signal of low frequency.
Below the circuit structure of control unit 33 that rough explanation is shown in Figure 3.See also Fig. 5 A and Fig. 5 B, and cooperate Fig. 3, wherein Fig. 5 A is the electrical block diagram of control unit shown in Figure 3, and Fig. 5 B is the sequential schematic diagram of voltage shown in Fig. 5 A and control signal.As shown in the figure, control unit 33 comprises one first comparator 330, one second comparator 331, one the 3rd comparator 332 and a not gate 333, and wherein the positive input terminal of first comparator 330 receives a first string ripple signal V
1, the negative input end of first comparator 330 is ground connection then, and the output of first comparator 330 electrically connects second switch element S
2Control end and export the second control signal Vc2, the positive input terminal of second comparator 331 receives first string ripple signal V
1, the negative input end of second comparator 331 then receives a triangular signal V
TRI, the output of second comparator 331 electrically connects the first switch element S
1Control end and the 6th switch element S
6Control end and export the first control signal Vc1 and the 6th control signal Vc6, the positive input terminal of the 3rd comparator 332 receives one second string ripple signal V
2, this first string ripple signal V
1And the second string ripple signal V
2Phase difference 180 degree, the negative input end of the 3rd comparator 332 receives triangular signal V
TRI, the output of the 3rd comparator 332 then electrically connects the 3rd switch element S
3Control end and the 4th switch element S
4Control end and export the 3rd control signal Vc3 and the 4th control signal Vc4, the input of not gate 333 is electrically connected at the output of first comparator 330, the output of not gate 333 is electrically connected at the 5th switch element S
5Control end, not gate 333 is reverse with the second control signal Vc2, to export the 5th control signal Vc5.
Certainly, control unit 33 is not limited to aforesaid circuit structure, in some embodiment, shown in Fig. 6 A and Fig. 6 B, control unit 33 also can change comprise one first comparator 630, one second comparator 631, one the 3rd comparator 632, one first not gate 633, one first with door 634, second with door 635 and rectifying device 636, wherein rectifying device 636 receptions one string ripple signal V
3, and it is rectified into a rectification string ripple signal V
4
The positive input terminal of first comparator 630 and rectifying device 636 electrically connect and reception rectification string ripple signal V
4, the negative input end of first comparator 630 then receives triangular signal V
TRI, the output of first comparator 630 be electrically connected at first with door 634 first input end.The positive input terminal of second comparator 631 receives string ripple signal V
3, the negative input end ground connection of second comparator 631, the output of second comparator 631 and second switch element S
2Control end electrically connect and export the second control signal Vc2.The positive input terminal of the 3rd comparator 632 and rectifying device 636 electrically connect and reception rectification string ripple signal V
4, the negative input end of the 3rd comparator 632 receives triangular signal V
TRI, the output of the 3rd comparator 632 be electrically connected at second with a door first input end of 635.
The input of first not gate 633 is electrically connected at the output of second comparator 631 and receives the second control signal Vc2, and the output of first not gate 633 electrically connects the 5th switch element S
5Control end, first not gate 633 is reverse with the second control signal Vc2, to export the 5th control signal Vc5 in the output of first not gate 633.First is electrically connected at the output of second comparator 631 and receives the second control signal Vc2 with door 634 second input, and first electrically connects the first switch element S with the output of door 634
1Control end and the 6th switch element S
6Control end and export the first control signal Vc1 and the 6th control signal Vc6, second electrically connects with the output of door 635 second input and first not gate 633 and receives the 5th control signal Vc5, and second electrically connects the 3rd switch element S with 635 output
3Control end and the 4th switch element S
4Control end and export the 3rd control signal Vc3 and the 4th control signal Vc4.
See also Fig. 7, Fig. 8 A and Fig. 8 B, wherein Fig. 7 is that one of inverter circuit shown in Figure 3 changes example, and Fig. 8 A is the electrical block diagram of control unit shown in Figure 7, and Fig. 8 B is the sequential schematic diagram of part voltage shown in Fig. 8 A and control signal.Shown in Fig. 7, Fig. 8 A and Fig. 8 B, in some embodiment, the first afterflow unit 330 shown in Figure 3 and the second afterflow unit 331 also can change respectively by minion pass element S
7And octavo is closed element S
8Constitute, and minion is closed element S
7And octavo is closed element S
8Can be but be not limited to and be made of mos field effect transistor, in addition, control unit 33 also closes element S with minion accordingly
7And octavo is closed element S
8Control end electrically connect, and export one the 7th control signal Vc7 and one the 8th control signal Vc8 and control minion respectively and close element S
7And octavo is closed element S
8Action.
What is more, the also corresponding change of the circuit structure of control unit 33 inside, for example compared to the control unit 33 shown in Fig. 6 A, control unit 33 shown in Fig. 8 A more comprised one second not gate 830, one the 3rd not gate 831, one the 3rd with door 832, one the 4th with the door 833, wherein the input of second not gate 830 is electrically connected at the output of first comparator 630, the output of second not gate 830 be electrically connected at the 3rd with door 832 first input end.The input of the 3rd not gate 831 electrically connects the output of the 3rd comparator 632, the output of the 3rd not gate 831 electrically connect the 4th with door 833 first input end.The 3rd electrically connects the output of second comparator 631 and receives the second control signal Vc2 with door 832 second input, and the 3rd electrically connects the 7th with the output of door 832 closes element S
7Control end and export the 7th control signal Vc7.The 4th electrically connects the output of first not gate 633 and receives the 5th control signal Vc5 with door 833 second input, and the 4th electrically connects the 8th with door 833 outputs closes element S
8Control end and export the 8th control signal Vc8.
So when in positive half cycle, for example in 0～very first time T
1Between, the 7th control signal Vc7 changes in the mode of pulse width modulation and high frequency, and in addition, the state of the 7th control signal Vc7 is opposite with the first control signal Vc1 and the 6th control signal Vc6, therefore as the first switch element S
1And the 6th switch element S
6During conducting, minion is closed element S
7End, anti-, as the first switch element S
1And the 6th switch element S
6When ending, minion is closed element S
7Conducting is to provide the afterflow path to first inductance L this moment
1And second inductance L
2Stored energy flows into, and then continues to maintain the forbidden energy level as for the 8th control signal Vc8.
When in negative half period, for example in very first time T
1～the second time T
2Between, the 8th control signal Vc8 changes in the mode of pulse width modulation and high frequency, and in addition, the state of the 8th control signal Vc8 is opposite with the 3rd control signal Vc3 and the 4th control signal Vc4, therefore as the 3rd switch element S
3And the 4th switch element S
4During conducting, octavo is closed element S
8End, anti-, as the 3rd switch element S
3And the 4th switch element S
4When ending, octavo is closed element S
8Conducting is to provide the afterflow path to first inductance L this moment
1And second inductance L
2Stored energy then changes as for the 7th control signal Vc7 and to continue to maintain the forbidden energy level.
In sum, inverter circuit of the present invention is arranged in pairs or groups mutually by first switch element to the, six switch elements, the first afterflow unit and the second afterflow unit, so can promote conversion efficiency, reduces production cost, and prevent the generation of leakage current and then the risk of harm reduction human body and equipment.
The present invention must be appointed by those skilled in the art and executes that the craftsman thinks and be to modify as all, yet does not take off the scope as the desire protection of attached claim institute.
Claims (20)
1. inverter circuit, framework comprises in direct current energy is converted to AC energy:
One switches circuit, and framework is in receiving direct current energy, and changes, and between one first and one second output output one AC regulating voltage, and comprise:
One first switching branches comprises the one first to the 3rd switch element that series connection in regular turn electrically connects, and electrically connects this first output between this second and third switch element;
One second switch branch road with the electric connection in parallel of this first switching branches, and comprises the one the 4th to the 6th switch element that series connection in regular turn electrically connects, and electrically connects this second output between the 5th and the 6th switch element;
One first afterflow unit, one end are electrically connected between this first and second switch element, and the other end electrically connects this second output; And
One second afterflow unit, one end are electrically connected between the 4th and the 5th switch element, and the other end electrically connects this first output;
Wherein, when positive half cycle, the simultaneously and constantly conducting or of this first and the 6th switch element by switching, this second switch element is a conducting state, when negative half period, change by the simultaneously and constantly conducting or by switching, the 5th switch element is a conducting state of the 3rd and the 4th switch element.
2. inverter circuit as claimed in claim 1, wherein, when positive half cycle, the 3rd switch element, the 4th switch element and the 5th switch element are cut-off state, when negative half period, this first switch element, this second switch element and the 6th switch element are cut-off state.
3. inverter circuit as claimed in claim 1, wherein this inverter circuit has more a control unit, electrically connect to the 6th switch element with this first switch element, framework is in controlling the action that this first switch element carries out conducting or ends to the 6th switch element respectively.
4. inverter circuit as claimed in claim 3, wherein this control unit comprises:
One first comparator, the positive input terminal of this first comparator receive a first string ripple signal, the negative input end ground connection of this first comparator, and the output of this first comparator electrically connects the control end of this second switch element;
One second comparator, the positive input terminal of this second comparator receives this first string ripple signal, the negative input end of this second comparator receives a triangular signal, and the output of this second comparator electrically connects the control end of this first switch element and the control end of the 6th switch element;
One the 3rd comparator, the positive input terminal of the 3rd comparator receives one second string ripple signal, the negative input end of the 3rd comparator receives this triangular signal, and the output of the 3rd comparator electrically connects the control end of the 3rd switch element and the control end of the 4th switch element; And
One not gate, the input of this not gate is electrically connected at the output of this first comparator, and the output of this not gate is electrically connected at the control end of the 5th switch element.
5. inverter circuit as claimed in claim 4, wherein phase difference 180 degree of this first string ripple signal and this second string ripple signal.
6. inverter circuit as claimed in claim 3, wherein this control unit comprises:
One rectifying device receives a string ripple signal, and is rectified into a rectification string ripple signal;
One first comparator, the positive input terminal of this first comparator electrically connects this rectifying device and receives this rectification string ripple signal, and the negative input end of this first comparator receives a triangular signal;
One second comparator, the positive input terminal of this second comparator receive this string ripple signal, the negative input end ground connection of this second comparator, and the output of this second comparator electrically connects the control end of this second switch element;
One the 3rd comparator, the positive input terminal of the 3rd comparator electrically connects this rectifying device and receives this rectification string ripple signal, and the negative input end of the 3rd comparator receives this triangular signal;
One not gate, the input of this not gate electrically connects the output of this second comparator, and the output of this not gate electrically connects the control end of the 5th switch element;
One first with the door, this first electrically connects the output of this first comparator with the first input end of door, this first electrically connects the output of this second comparator with second input of door, and this first electrically connects the control end of this first switch element and the control end of the 6th switch element with the output of door; And
One second with the door, this second electrically connects the output of this not gate with the first input end of door, this second electrically connects the output of the 3rd comparator with second input of door, and this second electrically connects the control end of the 3rd switch element and the control end of the 4th switch element with the output of door.
7. inverter circuit as claimed in claim 3, wherein this first afterflow unit is made of minion pass element, this second afterflow unit closes element by an octavo and constitutes, and this control unit and this minion are closed element and this octavo is closed the element electric connection, and this minion is closed element and this octavo is closed the action that element carries out conducting or ends to control respectively.
8. inverter circuit as claimed in claim 7, wherein this control unit is controlled this minion and is closed element and end when positive half cycle and this first switch element and the 6th switch element conducting, and control this minion close element in positive half cycle and this first switch element and the 6th switch element by the time conducting, and control this octavo and close element and when positive half cycle, end.
9. inverter circuit as claimed in claim 8, wherein this control unit is controlled this octavo and is closed element and end when negative half period and the 3rd switch element and the 4th switch element conducting, and control this octavo close element in negative half period and the 3rd switch element and the 4th switch element by the time conducting, and control this minion and close element and when negative half period, end.
10. inverter circuit as claimed in claim 7, wherein this minion pass element and this octavo pass element change in the mode of pulse width modulation and high frequency respectively.
11. inverter circuit as claimed in claim 7, wherein this control unit comprises:
One rectifying device receives a string ripple signal, and is rectified into a rectification string ripple signal;
One first comparator, the positive input terminal of this first comparator electrically connects this rectifying device and receives this rectification string ripple signal, and the negative input end of this first comparator receives a triangular signal;
One second comparator, the positive input terminal of this second comparator receive this string ripple signal, the negative input end ground connection of this second comparator, and the output of this second comparator electrically connects the control end of this second switch element;
One the 3rd comparator, the positive input terminal of the 3rd comparator electrically connect this rectifying device and receive this rectification string ripple signal, and the negative input end of the 3rd comparator receives this triangular signal;
One first not gate, the input of this first not gate electrically connects the output of this second comparator, and the output of this first not gate electrically connects the control end of the 5th switch element;
One first with the door, this first electrically connects the output of this first comparator with the first input end of door, this first electrically connects the output of this second comparator with second input of door, and this first electrically connects the control end of this first switch element and the control end of the 6th switch element with the output of door;
One second with the door, this second electrically connects the output of this first not gate with the first input end of door, this second electrically connects the output of the 3rd comparator with second input of door, and this second electrically connects the control end of the 3rd switch element and the control end of the 4th switch element with the output of door;
One second not gate, the input of this second not gate electrically connects the output of this first comparator;
One the 3rd not gate, the input of the 3rd not gate electrically connects the output of the 3rd comparator;
One the 3rd with the door, the 3rd electrically connects the output of this second not gate with the first input end of door, the 3rd electrically connects the output of this second comparator with second input of door, and the 3rd electrically connects the control end that this minion is closed element with the output of door; And
One the 4th with door, the 4th electrically connects the output of the 3rd not gate with the first input end of door, the 4th electrically connects the output of this first not gate with second input of door, the 3rd electrically connects the control end that this octavo is closed element with the output of door.
12. inverter circuit as claimed in claim 1, wherein this first switch element, this second switch element, the 3rd switch element, the 4th switch element, the 5th switch element and the 6th switch element move in the mode of pulse width modulation.
13. inverter circuit as claimed in claim 1, wherein this first switch element, the 3rd switch element, the 4th switch element and the 6th switch element carry out conducting or end switching in the mode of high frequency, and this second switch element and the 5th switch element carry out conducting or end switching in the mode of low frequency.
14. inverter circuit as claimed in claim 1, wherein this inverter circuit is a non-isolation type.
15. inverter circuit as claimed in claim 1, wherein this inverter circuit is applied to the sunlight grid-connected system, and this first to the 6th switch element is made of mos field effect transistor.
16. inverter circuit as claimed in claim 1, wherein this of this commutation circuit first output maintains a fixed value to this second output of one first relative voltage of the specified point in this inverter circuit and this commutation circuit to the addition mean value of one second relative voltage of this specified point.
17. inverter circuit as claimed in claim 1, wherein this first afterflow unit is made of one first fly-wheel diode, the cathode terminal of this first fly-wheel diode is electrically connected between this first switch element and this second switch element, and the anode tap of this first fly-wheel diode is electrically connected at this second output.
18. inverter circuit as claimed in claim 1, wherein this second afterflow unit is made of one second fly-wheel diode, the cathode terminal of this second fly-wheel diode is electrically connected between the 4th switch element and the 5th switch element, and the anode tap of this second fly-wheel diode is electrically connected at this first output.
19. inverter circuit as claimed in claim 1, wherein this inverter circuit has more an input filter circuit and an output filter circuit, this input filter circuit and this commutation circuit electrically connect, framework is in receiving a direct current input voltage, and this DC input voitage carried out filtering, change to export filtered this DC input voitage to this commutation circuit, this output filter circuit and this commutation circuit electrically connect, framework is in the high frequency composition of this AC regulating voltage of filtering, to export an ac output voltage.
20. inverter circuit as claimed in claim 1, wherein this first afterflow unit structure is in providing by this second output to the afterflow path between this first and second switch element, and this second afterflow unit structure is in providing by this first output to another afterflow path between the 4th and the 5th switch element.
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| CN2011101960048A CN102244476B (en) | 2011-07-13 | 2011-07-13 | Inverter circuit |
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| CN102570886A (en) * | 2011-12-29 | 2012-07-11 | 阳光电源股份有限公司 | Single-phase inverter |
| CN103762871A (en) * | 2013-12-17 | 2014-04-30 | 江苏博纬新能源科技有限公司 | Bootstrap drive non-isolated grid-connected inverter circuit adopting unipolarity SPWM |
| CN105827126A (en) * | 2015-01-09 | 2016-08-03 | 台达电子工业股份有限公司 | Dual-buck DC to AC conversion system and operation method thereof |
| CN111316558A (en) * | 2017-11-14 | 2020-06-19 | 三菱电机株式会社 | Power conversion device |
| CN112737387A (en) * | 2019-10-14 | 2021-04-30 | 台达电子工业股份有限公司 | Electric power system |
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| CN101667789A (en) * | 2009-04-14 | 2010-03-10 | 赵磊 | Inverter circuit used for solar energy photovoltaic grid connection and device thereof |
| CN102088193A (en) * | 2011-03-04 | 2011-06-08 | 东南大学 | Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof |
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| EP0756371B1 (en) * | 1995-07-19 | 2003-08-27 | Matsushita Electric Industrial Co., Ltd. | Current command type PWM inverter apparatus with logic circuit for generating switching command signals at periodical timings |
| CN101667789A (en) * | 2009-04-14 | 2010-03-10 | 赵磊 | Inverter circuit used for solar energy photovoltaic grid connection and device thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102570886A (en) * | 2011-12-29 | 2012-07-11 | 阳光电源股份有限公司 | Single-phase inverter |
| CN102570886B (en) * | 2011-12-29 | 2014-06-11 | 阳光电源股份有限公司 | Single-phase inverter |
| CN103762871A (en) * | 2013-12-17 | 2014-04-30 | 江苏博纬新能源科技有限公司 | Bootstrap drive non-isolated grid-connected inverter circuit adopting unipolarity SPWM |
| CN105827126A (en) * | 2015-01-09 | 2016-08-03 | 台达电子工业股份有限公司 | Dual-buck DC to AC conversion system and operation method thereof |
| CN105827126B (en) * | 2015-01-09 | 2018-10-09 | 台达电子工业股份有限公司 | Double down formula direct current delivers stream converting system and its operating method |
| CN111316558A (en) * | 2017-11-14 | 2020-06-19 | 三菱电机株式会社 | Power conversion device |
| CN111316558B (en) * | 2017-11-14 | 2023-04-11 | 三菱电机株式会社 | Power conversion device |
| CN112737387A (en) * | 2019-10-14 | 2021-04-30 | 台达电子工业股份有限公司 | Electric power system |
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| CN102244476B (en) | 2013-11-27 |
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