CN102244476B - Inverter circuit - Google Patents
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- CN102244476B CN102244476B CN2011101960048A CN201110196004A CN102244476B CN 102244476 B CN102244476 B CN 102244476B CN 2011101960048 A CN2011101960048 A CN 2011101960048A CN 201110196004 A CN201110196004 A CN 201110196004A CN 102244476 B CN102244476 B CN 102244476B
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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, Decrease production cost, and prevent the inverter circuit of leakage current generating.
Background technology
The main energy sources that the current mankind use is oil, by burning petroleum, produce required power or electric energy, for example automobile or fuel oil type generator (factory), yet, the high temperature produced in the oil combustion process and waste gas, except meeting causes the air quality deterioration, more can make Global Greenhouse Effect worsen.In addition, according to whole world Petroleum Production statistics, oil production rate will peak in 10 years; thereafter output is by reduced 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, indirectly causes the global economy storm.
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 energy generating system of solar power generation, owing to having environmental protection, be easy to install, the maturation of commercialized technology and the auxiliary pushing of state plan, become the main selection of advanced country's development decentralized power supply system.
Refer to 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 an input filter circuit 10, a full-bridge type commutation circuit 11 and an output filter circuit 12, consisted of, wherein input filter circuit 10 is by one first capacitor C
1Form, in order to receive the DC input voitage V produced by solar panels
DC, and to DC input voitage V
DCCarry out filtering.11 of full-bridge type commutation circuits are electrically connected with output filter circuit 12, and by first to fourth switch element S
1-S
4Form, the first switch element S
1And second switch element S
2Series connection is electrically connected, the 3rd switch element S
3And the 4th switch element S
4Also series connection is electrically connected, and forms whereby the full-bridge framework of two bridge arm types, first to fourth switch element S
1-S
4By the switchover operation that conducting or cut-off are carried out in the control of a control unit (not shown), make whereby full-bridge type commutation circuit 11 by filtered DC input voitage V
DCBe converted to AC regulating voltage V
T.12 of output filter circuits are electrically connected with full-bridge type commutation circuit 11, and by one first inductance L
1, one second inductance L
2And one second filter capacitor C
2Form, 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 switching (Bipolar) or unipolarity switching (Unipolar), wherein, when full-bridge type commutation circuit 11 adopts unipolar switching working mode operation, during due to each switching over, only have two switch elements that single brachium pontis comprises in the action of carrying out the high frequency switching, make AC regulating voltage V
Tonly 0 on the occasion of DC input voitage V
DCbetween or at the 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, make 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, the switch cost that full-bridge type commutation circuit 11 adopts unipolar switching working mode to have is fewer than adopting the bipolarity switching working mode, in other words, be that efficiency 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 operation, because there is no method for the addition mean value of the relative voltage of any point in inverter circuit 1 a switching time point in office, the positive output end of full-bridge type commutation circuit 11 and negative output terminal maintain a fixed value, cause producing DC input voitage V
DCsolar panels between over the ground existing parasitic capacitance Cp produce obvious voltage variety, and then produce leakage current and harmful to human and equipment.
Refer to 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, also referred to as the NPC inverter, this inverter circuit 2 has an input filter circuit 20, switching circuit 21 and an 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 in this, repeats no more.Commutation circuit 21 is closed element S by the first switch element to the twelvemo
1～S
12Form, the 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 the first switch element to the twelvemo that forms the neutral-point-clamped circuit framework
1～S
12Conducting to each other or cut-off action, solar panels over the ground between existing parasitic capacitance Cp can't produce obvious voltage variety, therefore can prevent the generation of leakage current, yet owing in inverter circuit 2, comprising 12 switch elements, the production cost that causes inverter circuit 2 is comparatively expensive, what is more, due to inverter circuit 2 by 12 switch elements in the operation of carrying out conducting or cut-off, 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 defect of improving, and raising efficiency, Decrease production cost reduce the inverter circuit of leakage current generating simultaneously, real be current problem in the urgent need to address.
Summary of the invention
Main purpose of the present invention is for a kind of inverter circuit is provided, and while to solve known inverter circuit, being applied to the sunlight grid-connected system, has the defects such as the not good and high cost of leakage current generating, conversion efficiency.
For reaching above-mentioned purpose, preferred embodiments 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: the first switching branches, comprise the first to the 3rd switch element that sequentially series connection is electrically connected, between second and third switch element, be electrically connected the first output; And the second switch branch road, with the electric connection in parallel of the first switching branches, and comprise the 4th to the 6th switch element that sequentially series connection is electrically connected, between the 5th and the 6th switch element, be electrically connected the second output; The first afterflow unit, one end are electrically connected between first and second switch element, and the other end is electrically connected the 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 is electrically connected the first output; Wherein, when positive half cycle, the first and the 6th switch element while and conducting or cut-off switching constantly, the second switch element is conducting state, when negative half period, change by the 3rd and the 4th switch element while and conducting or cut-off switching constantly, the 5th switch element is conducting state.
Inverter circuit of the present invention is arranged in pairs or groups mutually by the first switch element to the six switch elements, the first afterflow unit and the second afterflow unit, can promote conversion efficiency, Decrease production cost, and prevent the generation of leakage current and then the risk of harm reduction human body and equipment.
The accompanying drawing explanation
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 the voltage shown in Fig. 5 A and control signal.
Fig. 6 A: it is that another of control unit shown in Figure 3 changes routine electrical block diagram.
Fig. 6 B: it is the voltage shown in showing and the sequential schematic diagram of control signal for Fig. 6 A.
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 the part voltage shown in Fig. 8 A and control signal.
Description of reference numerals in 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
The 330～332: first～three comparator
333: not gate
The 630～632: first～three comparator
633: the first not gates
634～635: the first～the second with the door
636: rectifying device
The 830～831: the first～the second not gate
The the 832～833: three～four with the door
636: rectifying device
8: flow directing device
9: AC load
C
1: the first electric capacity
C
2: the second electric capacity
Cp: parasitic capacitance
L
1: the first inductance
L
2: the second inductance
Vo: ac output voltage
V
DC: DC input voitage
V
T: AC regulating voltage
Vc1～Vc8: the 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: the first output
B: the second output
N: be total to contact
D
1～D
2: the first fly-wheel diode～second fly-wheel diode
T
1～T
2: the first～the second time
Embodiment
Some exemplary embodiments that embody feature & benefits of the present invention will describe in detail in the explanation of back segment.Be understood that the present invention can have various variations on different modes, however its do not depart from the scope of the present invention, and explanation wherein and the accompanying drawing use that ought explain in itself, but not in order to limit the present invention.
Refer to 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 produced
DC, and be converted to ac output voltage Vo, and to provide to an AC load 9, such as AC electric appliance equipment or civil power network system etc.
In the present embodiment, the first switch element S
1, second switch element S
2And the 3rd switch element S
3Sequentially series connection is electrically connected and forms the 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 be electrically connected, 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 be electrically connected, in addition, second switch element S
2And the 3rd switch element S
3Between connect the first output terminals A.The 4th switch element S
4, the 5th switch element S
5And the 6th switch element S
6Sequentially series connection is electrically connected and forms the second switch branch road 313 with the electric connection in parallel of the first switching branches 312 and the 4th switch element S
4An end and the anode of the anode of flow directing device 8 and input filter circuit 30 be electrically connected, the 6th switch element S
6An end with the negative terminal of the negative terminal of flow directing device 8 and input filter circuit 30, be electrically connected, in addition, the 5th switch element S
5And the 6th switch element S
6Between be electrically connected 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 is electrically connected at the second output B, and the first afterflow unit 310 is in order to provide by the 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 is electrically connected at the first output terminals A, and the second afterflow unit 311 is in order to provide by the first output terminals A to the four switch element S
4With the 5th switch element S
5Between another afterflow path.
In above-described embodiment, the first afterflow unit 310 is by the first sustained diode
1Form, the second afterflow unit 311 is by the second sustained diode
2Form, wherein, the first sustained diode
1Cathode terminal be electrically connected at the first switch element S
1And second switch element S
2Between, the first sustained diode
1Anode tap be electrically connected at the second output B, the second sustained diode
2Cathode terminal be electrically connected at the 4th switch element S
4And the 5th switch element S
5Between, the second sustained diode
2Anode tap be electrically connected at the first output terminals A.
Below the manner of execution of inverter circuit shown in Figure 33 will be described exemplarily.Refer to Fig. 4 A and Fig. 4 B, and coordinate 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.As 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), therefore the first switch element S
1And the 6th switch element S
6Simultaneously and carry out constantly conducting or cut-off switching, in addition, the 3rd control signal Vc3, the 4th control signal Vc4 and the 5th control signal Vc5 continue to be maintained the forbidden energy level, therefore the 3rd switch element S
3, the 4th switch element S
4With the 5th switch element S
5For cut-off state, moreover, the second control signal Vc
2Continue to be maintained and enable level, therefore second switch element S
2For 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 sequentially flows through
1, second switch element S
2, the first inductance L
1, the second capacitor C
2, the second inductance L
2And the 6th switch element S
6Therefore, the 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 with form of communication, the first inductance L simultaneously
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
6While switching to cut-off state, due to the current continuity characteristic of inductance, therefore the first inductance L
1And second inductance L
2Stored energy just can be take the mode of electric current and sequentially flowed through and the first afterflow unit 310 in afterflow path is provided and is the second switch element S of 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
1The～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, therefore the 3rd switch element S
3And the 4th switch element S
4Simultaneously and carry out constantly conducting or cut-off switching, in addition, the first control signal Vc1, the second control signal Vc
2And the 6th control signal V
C6Change by continuing to maintain the forbidden energy level, therefore the first switch element S
1, second switch element S
2And the 6th switch element S
6For cut-off state, moreover the 5th control signal Vc5 changes by continuing to maintain and enables level, therefore the 5th switch element S
5For 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 sequentially flowed through and the 4th is closed element S
4, the 5th switch element S
5, the second inductance L
2, the second capacitor C
2, the first inductance L
1And the 3rd switch element S
3Therefore, the 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 with form of communication, the first inductance L simultaneously
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
4While switching to cut-off state, due to the current continuity characteristic of inductance, therefore the first inductance L
1And second inductance L
2Stored energy just can be take the mode of electric current and sequentially flowed through and the second afterflow unit 311 in afterflow path is provided and is the 5th switch element S of conducting state
5, old friend's current load 9 also receives the electric energy that flow directing device 8 is exported sustainably.
Please consult again Fig. 4 B, by the 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 mutually, the AC regulating voltage V that commutation circuit 31 is exported
Twhen positive half cycle 0 on the occasion of a specific voltage value Vr between do change, at negative half period, be to do change between 0 value of the specific voltage to negative value Vr, therefore the full-bridge type commutation circuit 11 of the actual manner of execution of commutation circuit 31 and known inverter circuit 1 shown in Figure 1 adopts unipolar switching working mode operation similar, so the 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, the 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, the first relative voltage V of the common contact N for example be electrically connected for the parasitic capacitance Cp (as shown in Figure 3) produced with flow directing device 8
ANand the second relative voltage V
BN, both maintain a fixed value by the addition mean value of a switching time point in office, therefore can't produce obvious voltage variety on 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, compared to known inverter circuit 2 shown in Figure 2,12 switch elements have been used, inverter circuit 3 of the present invention has only been used six Katyuan parts and two afterflow unit in the operation of carrying out conducting or cut-off, therefore not only reduce the production cost of inverter circuit 3, also reduce the loss caused while moving because of switch element, and then more promoted the conversion efficiency of inverter circuit 3.
In above-described embodiment, the first to the 6th switch element S
1-S
6Can be formed by mos field effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), but not as limit.
In above-described embodiment, the first control signal Vc1, the 3rd control signal Vc3, the 4th control signal Vc4 and the 6th control signal V
C6For the pulse width modulating signal of high frequency, the second control signal Vc
2And the 5th control signal Vc5 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.Refer to Fig. 5 A and Fig. 5 B, and coordinate 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 the 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 the first comparator 330 receives a first string ripple signal V
1, the negative input end of the first comparator 330 is ground connection, and the output of the first comparator 330 is electrically connected second switch element S
2Control end and export the second control signal Vc2, the positive input terminal of the second comparator 331 receives first string ripple signal V
1, the negative input end of the second comparator 331 receives a triangular signal V
TRI, the output of the second comparator 331 is electrically connected 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 is electrically connected 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 the 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 by the second control signal Vc2, to export the 5th control signal Vc5.
Certainly, control unit 33 is not limited to circuit structure as above, in some embodiment, as 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 reception one string ripple signal V
3, and it is rectified into to a rectification string ripple signal V
4.
The positive input terminal of the first comparator 630 and rectifying device 636 are electrically connected and reception rectification string ripple signal V
4, the negative input end of the first comparator 630 receives triangular signal V
TRI, the output of the first comparator 630 be electrically connected at first with door 634 first input end.The positive input terminal of the second comparator 631 receives string ripple signal V
3, the negative input end ground connection of the second comparator 631, the output of the second comparator 631 and second switch element S
2Control end be electrically connected and export the second control signal Vc2.The positive input terminal of the 3rd comparator 632 and rectifying device 636 are electrically connected 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 the first not gate 633 is electrically connected at the output of the second comparator 631 and receives the second control signal Vc2, and the output of the first not gate 633 is electrically connected the 5th switch element S
5Control end, the first not gate 633 is reverse by the second control signal Vc2, with the output in the first not gate 633 output the 5th control signal Vc5.First is electrically connected at the output of the second comparator 631 and receives the second control signal Vc2 with the second input of door 634, and first is electrically connected 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 is electrically connected and receives the 5th control signal Vc5 with the second input of door 635 and the output of the first not gate 633, and second is electrically connected the 3rd switch element S with the output of door 635
3Control end and the 4th switch element S
4Control end and export the 3rd control signal Vc3 and the 4th control signal Vc4.
Refer to 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 the part voltage shown in Fig. 8 A and control signal.As 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 the 8th switch element S
8Form, and minion is closed element S
7And the 8th switch element S
8Can be but be not limited to and consist of mos field effect transistor, in addition, control unit 33 also closes element S with minion accordingly
7And the 8th switch element S
8Control end be electrically connected, and export one the 7th control signal Vc7 and one the 8th control signal Vc8 and control respectively minion and close element S
7And the 8th switch 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 the second not gate 830 is electrically connected at the output of the first comparator 630, the output of the second not gate 830 be electrically connected at the 3rd with door 832 first input end.The input of the 3rd not gate 831 is electrically connected the output of the 3rd comparator 632, the output electric connection the 4th of the 3rd not gate 831 and the first input end of door 833.The 3rd is electrically connected the output of the second comparator 631 and receives the second control signal Vc2 with the second input of door 832, and the 3rd is electrically connected the 7th with the output of door 832 closes element S
7Control end and export the 7th control signal Vc7.The 4th is electrically connected the output of the first not gate 633 and receives the 5th control signal Vc5 with the second input of door 833, and the 4th is electrically connected the 8th with door 833 outputs closes element S
8Control end and export the 8th control signal Vc8.
Therefore 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
7Cut-off, anti-, as the first switch element S
1And the 6th switch element S
6During cut-off, minion is closed element S
7Conducting, with in now providing the afterflow path to the first inductance L
1And second inductance L
2Stored energy flows into, and 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
1The～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, the 8th switch element S
8Cut-off, anti-, as the 3rd switch element S
3And the 4th switch element S
4During cut-off, the 8th switch element S
8Conducting, with in now providing the afterflow path to the first inductance L
1And second inductance L
2Stored energy, change and continue to maintain the forbidden energy level as for the 7th control signal Vc7.
In sum, inverter circuit of the present invention is arranged in pairs or groups mutually by the first switch element to the six switch elements, the first afterflow unit and the second afterflow unit, therefore can promote conversion efficiency, Decrease 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 and be executed that the craftsman thinks and be to modify as all by those skilled in the art, however scopes of de-as attached claim institute wish protection.
Claims (17)
1. inverter circuit, framework, in direct current energy is converted to AC energy, comprises:
One switching circuit, framework be in receiving direct current energy, and change, and between one first and one second output output one AC regulating voltage, and comprise:
One first switching branches, comprise one first to the 3rd switch element that sequentially series connection is electrically connected, and between this second and third switch element, is electrically connected this first output;
One second switch branch road, with the electric connection in parallel of this first switching branches, and comprise the one the 4th to the 6th switch element that sequentially series connection is electrically connected, and between the 5th and the 6th switch element, is electrically connected this second output;
One first afterflow unit, one end are electrically connected between this first and second switch element, and the other end is electrically connected 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 is electrically connected this first output; And
One control unit, be electrically connected to the 6th switch element with this first switch element, and framework carries out the action of conducting or cut-off in controlling respectively this first switch element to the 6th switch element;
Wherein, when positive half cycle, this first and the 6th switch element while and conducting or cut-off switching constantly, this second switch element is conducting state, when negative half period, change by the 3rd and the 4th switch element while and conducting or cut-off switching constantly, the 5th switch element is conducting state;
Wherein, this the first afterflow unit closes element by a minion and forms, this the second afterflow unit consists of one the 8th switch element, and this control unit and this minion are closed element and the 8th switch element is electrically connected, to control respectively this minion pass element and the 8th switch element, carry out the action of conducting or cut-off, and this control unit is controlled this minion pass element and is ended when positive half cycle and this first switch element and the 6th switch element conducting, and control this minion and close element conducting when positive half cycle and this first switch element and the cut-off of the 6th switch element, and control the 8th switch element and end when positive half cycle.
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 control unit comprises:
One first comparator, the positive input terminal of this first comparator receives a first string ripple signal, the negative input end ground connection of this first comparator, the output of this first comparator is electrically connected 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 is electrically connected 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 is electrically connected 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.
4. inverter circuit as claimed in claim 3, wherein phase difference 180 degree of this first string ripple signal and this second string ripple signal.
5. inverter circuit as claimed in claim 1, wherein this control unit comprises:
One rectifying device, receive a string ripple signal, and be rectified into a rectification string ripple signal;
One first comparator, the positive input terminal of this first comparator is electrically connected 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 is electrically connected the control end of this second switch element;
One the 3rd comparator, the positive input terminal of the 3rd comparator is electrically connected 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 is electrically connected the output of this second comparator, and the output of this not gate is electrically connected the control end of the 5th switch element;
One first with the door, this first is electrically connected the output of this first comparator with the first input end of door, this first is electrically connected the output of this second comparator with the second input of door, and this first is electrically connected 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 is electrically connected the output of this not gate with the first input end of door, this second is electrically connected the output of the 3rd comparator with the second input of door, and this second is electrically connected the control end of the 3rd switch element and the control end of the 4th switch element with the output of door.
6. inverter circuit as claimed in claim 1, wherein this control unit is controlled the 8th switch element and is ended when negative half period and the 3rd switch element and the 4th switch element conducting, and control the conducting when negative half period and the 3rd switch element and the cut-off of the 4th switch element of the 8th switch element, and control this minion pass element and end when negative half period.
7. inverter circuit as claimed in claim 1, wherein this minion is closed element and the 8th switch element changes in the mode of pulse width modulation and high frequency respectively.
8. inverter circuit as claimed in claim 1, wherein this control unit comprises:
One rectifying device, receive a string ripple signal, and be rectified into a rectification string ripple signal;
One first comparator, the positive input terminal of this first comparator is electrically connected 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 is electrically connected the control end of this second switch element;
One the 3rd comparator, the positive input terminal of the 3rd comparator are electrically connected 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 is electrically connected the output of this second comparator, and the output of this first not gate is electrically connected the control end of the 5th switch element;
One first with the door, this first is electrically connected the output of this first comparator with the first input end of door, this first is electrically connected the output of this second comparator with the second input of door, and this first is electrically connected 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 is electrically connected the output of this first not gate with the first input end of door, this second is electrically connected the output of the 3rd comparator with the second input of door, and this second is electrically connected 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 is electrically connected the output of this first comparator;
One the 3rd not gate, the input of the 3rd not gate is electrically connected the output of the 3rd comparator;
One the 3rd with the door, the 3rd is electrically connected the output of this second not gate with the first input end of door, the 3rd is electrically connected the output of this second comparator with the second input of door, and the 3rd is electrically connected with the output of door the control end that this minion is closed element; And
One the 4th with door, the 4th is electrically connected the output of the 3rd not gate with the first input end of door, the 4th is electrically connected the output of this first not gate with the second input of door, the 3rd is electrically connected the control end of the 8th switch element with the output of door.
9. 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.
10. 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 cut-off switching in the mode of high frequency, and this second switch element and the 5th switch element carry out conducting or cut-off switching in the mode of low frequency.
11. inverter circuit as claimed in claim 1, wherein this inverter circuit is non-isolation type.
12. 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 consists of mos field effect transistor.
13. inverter circuit as claimed in claim 1, wherein this first output of this commutation circuit 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.
14. inverter circuit as claimed in claim 1, wherein this first afterflow unit consists 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.
15. inverter circuit as claimed in claim 1, wherein this second afterflow unit consists 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.
16. 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 are electrically connected, framework is in receiving a direct current input voltage, and this DC input voitage is carried out to filtering, with this DC input voitage after output filtering to this commutation circuit, change, this output filter circuit and this commutation circuit are electrically connected, framework is in the high frequency composition of this AC regulating voltage of filtering, to export an ac output voltage.
17. 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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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101960048A CN102244476B (en) | 2011-07-13 | 2011-07-13 | Inverter circuit |
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| CN102244476B true CN102244476B (en) | 2013-11-27 |
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| 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 |
| 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 |
| 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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| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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