CN102882398B - DC-AC converter - Google Patents
DC-AC converter Download PDFInfo
- Publication number
- CN102882398B CN102882398B CN201110205041.0A CN201110205041A CN102882398B CN 102882398 B CN102882398 B CN 102882398B CN 201110205041 A CN201110205041 A CN 201110205041A CN 102882398 B CN102882398 B CN 102882398B
- Authority
- CN
- China
- Prior art keywords
- switch
- switching signal
- bridge inverter
- electrically coupled
- electric capacity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Inverter Devices (AREA)
Abstract
The invention provides a kind of DC-AC converter, it comprises the first switch, second switch, the first half-bridge inverter and the second half-bridge inverter.First switch comprises first end and the second end.Second switch comprises first end and the second end, in order to receive DC power supply between the first end of the first switch and the first end of second switch.First half-bridge inverter comprises first end, the second end and output.Second half-bridge inverter comprises first end, the second end and output, wherein between the output of the first half-bridge inverter and the output of the second half-bridge inverter in order to output AC power source.
Description
Technical field
The invention relates to a kind of transducer, and relate to a kind of DC-AC converter especially.
Background technology
In recent years due to industrial and commercial flourishing, social progress, the product relatively provided also mainly for convenient, certain, economical and practical be purport, therefore, the product also progress more than ever of current exploitation, and contributed society.
By conventional full bridge inverter applications in non-isolation type sunlight grid-connected system, there is some shortcomings in the PWM modulation mode of full-bridge inverter: the PWM modulation mode of inverter switches (bipolar) according to bipolarity, then there is switch cost comparatively large, the shortcoming of inverter efficiency difference; In addition, the PWM modulation mode of inverter switches (unipolar) according to unipolarity, then there is the shortcoming that leakage current is larger.
As can be seen here, obviously still there is inconvenience and defect, and need to be further improved in above-mentioned existing mode.In order to solve the problem, association area there's no one who doesn't or isn't seeks solution painstakingly, but has no applicable mode for a long time always and completed by development.Therefore, when how to avoid inverter to adopt bipolarity to switch, switch cost is comparatively large with inefficient problem, and when how to avoid inverter to adopt unipolarity to switch, the problem that leakage current is larger, one of current important research and development problem of real genus, also becomes the target that current association area needs improvement badly.
Summary of the invention
One object of content of the present invention is providing a kind of DC-AC converter, so as to improve inverter adopt bipolarity to switch time, switch cost is comparatively large with inefficient problem, and improves inverter when adopting unipolarity to switch, the problem that leakage current is larger.
For reaching above-mentioned purpose, a technical scheme of content of the present invention is about a kind of DC-AC converter.DC-AC converter comprises the first switch, second switch, the first half-bridge inverter and the second half-bridge inverter.First switch comprises first end and the second end.Second switch comprises first end and the second end, in order to receive DC power supply between the first end of the first switch and the first end of second switch.First half-bridge inverter comprises first end, the second end and output, and wherein the first end of the first half-bridge inverter is electrically coupled to the second end of the first switch, and the second end of the first half-bridge inverter is electrically coupled to the second end of second switch.Second half-bridge inverter comprises first end, the second end and output, wherein the first end of the second half-bridge inverter is electrically coupled to the second end of the first switch, second end of the second half-bridge inverter is electrically coupled to the second end of second switch, wherein between the output of the first half-bridge inverter and the output of the second half-bridge inverter in order to output AC power source.
According to one embodiment of the invention, the first half-bridge inverter comprises the 3rd switch and the 4th switch.3rd switch comprises first end and the second end, and wherein the first end of the 3rd switch is the first end of the first half-bridge inverter.4th switch comprises first end and the second end, and wherein the first end of the 4th switch is electrically coupled to the second end of the 3rd switch, and the second end of the 4th switch is the second end of the first half-bridge inverter.Wherein the second end of the 3rd switch and the first end of the 4th switch join at first node, and first node is the output of the first half-bridge inverter.
According to another embodiment of the present invention, the second half-bridge inverter comprises the 5th switch and the 6th switch.5th switch comprises first end and the second end, and wherein the first end of the 5th switch is the first end of the second half-bridge inverter.6th switch comprises first end and the second end, and wherein the first end of the 6th switch is electrically coupled to the second end of the 5th switch, and the second end of the 6th switch is the second end of the second half-bridge inverter.Wherein the second end of the 5th switch and the first end of the 6th switch join at Section Point, and Section Point is the output of the second half-bridge inverter.
According to yet another embodiment of the invention, DC-AC converter also comprises the first electric capacity and the second electric capacity.First electric capacity comprises first end and the second end, and wherein the first end of the first electric capacity is electrically coupled to the first end of the first switch.Second electric capacity comprises first end and the second end, and wherein the first end of the second electric capacity is electrically coupled to the second end of the first electric capacity, and the second end of the second electric capacity is electrically coupled to the first end of second switch.
According to further embodiment of this invention, DC-AC converter also comprises the first inductance and the second inductance.First inductance comprises first end and the second end, and wherein the first end of the first inductance is electrically coupled to the output of the first half-bridge inverter.Second inductance comprises first end and the second end, and wherein the first end of the second inductance is electrically coupled to the output of the second half-bridge inverter.
According to the another embodiment again of the present invention, DC-AC converter also comprises the 3rd electric capacity and the 4th electric capacity.3rd electric capacity comprises first end and the second end, and wherein the first end of the 3rd electric capacity is electrically coupled to the second end of the first inductance, and the second end of the 3rd electric capacity is electrically coupled to this second end of the first electric capacity.4th electric capacity comprises first end and the second end, and wherein the first end of the 4th electric capacity is electrically coupled to the first end of the second electric capacity, and the second end of the 4th electric capacity is electrically coupled to the second end of the second inductance.Wherein the second end of the first inductance and the first end of the 3rd electric capacity join in the 3rd node, and the second end of the second end of the second inductance and the 4th electric capacity joins in the 4th node, by means of making output AC power source between the 3rd node and the 4th node.
According to the another another embodiment of the present invention, the first switch is in order to receive the first switching signal, and second switch is in order to receive second switch signal, and the first switch and second switch are subject to the control of the first switching signal and second switch signal respectively and open simultaneously or close.
According to the present invention's another embodiment again, 3rd switch is in order to receive the 3rd switching signal, and the 4th switch is in order to receive the 4th switching signal, and the 3rd switch and the 4th switch are subject to the control of the 3rd switching signal and the 4th switching signal respectively, when making the 3rd switch open, the 4th switch cuts out.
According to the present invention's another embodiment again, first switching signal, second switch signal and the 3rd switching signal produced by the first reference voltage and triangle wave, when the first reference voltage is in positive half cycle, the first switch, second switch and the 3rd switch are opened simultaneously by the control of the first switching signal, second switch signal and the 3rd switching signal or close respectively.
According to the present invention's another embodiment again, 5th switch is in order to receive the 5th switching signal, and the 6th switch is in order to receive the 6th switching signal, and the 5th switch and the 6th switch are subject to the control of the 5th switching signal and the 6th switching signal respectively, when making the 5th switch open, the 6th switch cuts out.
According to the present invention's embodiment more again, 5th switching signal produced by the second reference voltage and triangle wave, the phase of the second reference voltage and the first reference voltage 180 degree, when the first reference voltage is in negative half period, the first switch, second switch and the 5th switch are opened simultaneously by the control of the first switching signal, second switch signal and the 5th switching signal or close respectively.
For reaching above-mentioned purpose, a technical scheme of content of the present invention is about a kind of DC-AC converter.DC-AC converter comprises the first switch, second switch, the first half-bridge inverter and the second half-bridge inverter.First switch is in order to receive the first switching signal to switch.Second switch is in order to receive second switch signal to switch.First half-bridge inverter in order to DC power supply is converted to out-put supply, and provides out-put supply to give AC power.Second half-bridge inverter in order to DC power supply is converted to out-put supply, and provides out-put supply to give AC power.
In addition, the first half-bridge inverter comprises the 3rd switch, the 4th switch and the first output.3rd switch is electrically coupled to the first switch, and in order to receive the 3rd switching signal to switch.4th switch is electrically coupled to the 3rd switch and second switch, and joins in first node with the 3rd switch, and the 4th switch is in order to receive the 4th switching signal to switch.First output is electrically coupled to first node, and in order to export out-put supply.Second half-bridge inverter comprises the 5th switch, the 6th switch and the second output.5th switch is electrically coupled to the first switch, and in order to receive the 5th switching signal to switch.6th switch is electrically coupled to the 5th switch and second switch, and joins in Section Point with the 5th switch, and the 6th switch is in order to receive the 6th switching signal to switch.Second output is electrically coupled to Section Point, and in order to export out-put supply.
According to one embodiment of the invention, the first switch and second switch are subject to the control of the first switching signal and second switch signal respectively and open simultaneously or close.
According to another embodiment of the present invention, the 3rd switch and the 4th switch are subject to the control of the 3rd switching signal and the 4th switching signal respectively, and when making the 3rd switch open, the 4th switch cuts out.
According to yet another embodiment of the invention, first switching signal, second switch signal and the 3rd switching signal produced by the first reference voltage and triangle wave, when the first reference voltage is in positive half cycle, the first switch, second switch and three switches are opened simultaneously by the control of the first switching signal, second switch signal and three switching signals or close respectively.
According to further embodiment of this invention, the 5th switch and the 6th switch are subject to the control of the 5th switching signal and the 6th switching signal respectively, and when making the 5th switch open, the 6th switch cuts out.
According to the another embodiment again of the present invention, 5th switching signal produced by the second reference voltage and triangle wave, the phase of the second reference voltage and the first reference voltage 180 degree, when the first reference voltage is in negative half period, the first switch, second switch and the 5th switch are opened simultaneously by the control of the first switching signal, second switch signal and the 5th switching signal or close respectively.
According to the another another embodiment of the present invention, DC-AC converter also comprises the first inductance capacitor filtering circuit.First inductance capacitor filtering circuit is electrically coupled to the first output, and in order to carry out filtering to out-put supply.
According to the present invention's another embodiment again, DC-AC converter also comprises the second inductance capacitor filtering circuit.Second inductance capacitor filtering circuit is electrically coupled to the second output, and in order to carry out filtering to out-put supply.
Therefore, according to technology contents of the present invention, the embodiment of the present invention is by providing a kind of DC-AC converter, during so as to improving inverter employing bipolarity switching, switch cost is comparatively large with inefficient problem, and improves inverter when adopting unipolarity to switch, the problem that leakage current is larger.
Accompanying drawing explanation
For above and other objects of the present invention, feature, advantage and embodiment can be become apparent, appended the description of the drawings is as follows:
Fig. 1 is the circuit diagram of a kind of DC-AC converter illustrated according to one embodiment of the invention;
Fig. 2 is the circuit diagram of a kind of DC-AC converter illustrated according to another embodiment of the present invention;
Fig. 3 is the schematic diagram of a kind of drive singal framework illustrated according to yet another embodiment of the invention;
Fig. 4 is the waveform schematic diagram of a kind of switching signal illustrated according to Fig. 3 of the present invention;
[primary clustering symbol description]
100: DC-AC converter
The first end of 112: the first switches, the first end of the first electric capacity
Second end of the second end of 114: the first electric capacity, the first end of the second electric capacity, the 3rd electric capacity, the first end of the 4th electric capacity
Second end of 116: the second electric capacity, the first end of second switch
The first end of the second end of 118: the first switches, the first end of the 3rd switch, the 5th switch
122: the second end of the second end of second switch, the second end of the 4th switch, the 6th switch
130: the first half-bridge inverters
140: the second half-bridge inverters
150: the first inductance capacitor filtering circuit
160: the second inductance capacitor filtering circuit
200: DC-AC converter
300: drive singal framework
310: the first comparators
320: the second comparators
330: the three comparators
340: absolute value encoder
Embodiment
In order to make of the present invention describe more detailed and complete, can refer to appended accompanying drawing and the various embodiment of the following stated, number identical in accompanying drawing represents same or analogous assembly.But the embodiment provided also is not used to limit the scope that contains of the present invention, and the description of structure operation is not used to limit its order performed, any structure reconfigured by assembly, produce the device with impartial effect, be all the scope that the present invention is contained.
Wherein accompanying drawing only for the purpose of description, do not map according to life size.On the other hand, well-known assembly and step are not described in embodiment, to avoid causing unnecessary restriction to the present invention.
Fig. 1 is the circuit diagram illustrating a kind of DC-AC converter 100 according to one embodiment of the invention.
As shown in Figure 1, DC-AC converter 100 comprises the first switch S 1, second switch S2, the first half-bridge inverter 130 and the second half-bridge inverter 140.First switch S 1 comprises first end 112 and the second end 118.Second switch S2 comprises between the first end 112 of first end 116 and the second end 122, first switch S 1 and the first end 116 of second switch in order to receive DC power supply DC.
It should be noted that at this, the end points of each assembly there will be the situation that same end points shared by two assemblies for the sake of clarity.When singly seeing an assembly, the two-end-point of aforementioned components indicates with different labels respectively; But with regard to the assembly of two handing-over, can there is the situation that label is shared in the interface point of first assembly and second assembly.Such as, when singly seeing the first electric capacity C1, it has the first end points 112 and the second end points 114, and with regard to the first electric capacity C1 of joining and the first switch S 1, the end points that first electric capacity C1 and the first switch S 1 join is end points 112, first end points of the first electric capacity C1 can be expressed as at this end points 112, and end points 112 also can be expressed as the first end points of the first switch S 1, so it is just different in statement, the difference understood in each original paper annexation can't be caused, and can usually know that the knowledgeable is understood by having in art.
In the present embodiment, first half-bridge inverter 130 comprises first end 118, second end 122 and output node1, the second end 122 that wherein first end 118 of the first half-bridge inverter 130 is electrically coupled to the second end 118, first half-bridge inverter 130 of the first switch S 1 is electrically coupled to the second end 122 of second switch.
In addition, second half-bridge inverter 140 comprises first end 118, second end 122 and output node2, wherein the first end 118 of the second half-bridge inverter 140 is electrically coupled to the second end 118 of the first switch S 1, second end 122 of the second half-bridge inverter 140 is electrically coupled to second end 122 of second switch S2, wherein between the output node1 of the first half-bridge inverter 130 and output node2 of the second half-bridge inverter 140 in order to output AC power source.
In operation, the first half-bridge inverter 130 can in order to DC power supply DC is converted to out-put supply, and provide out-put supply to give AC power by the output node1 of the first half-bridge inverter 130.Second half-bridge inverter 140 can in order to DC power supply DC is converted to out-put supply, and provide out-put supply to give AC power by the output node2 of the second half-bridge inverter 140.
In another embodiment, the first half-bridge inverter 130 comprises the 3rd switch S 3 and the 4th switch S 4.3rd switch S 3 comprises first end 118 and the second end node1, and wherein the first end 118 of the 3rd switch S 3 is the first end 118 of the first half-bridge inverter 130.4th switch S 4 comprises first end node1 and the second end 122, and wherein the first end node1 of the 4th switch S 4 is electrically coupled to the second end node1 of the 3rd switch S 3, and the second end 122 of the 4th switch S 4 is the second end 122 of the first half-bridge inverter 130.Wherein the second end node1 of the 3rd the switch S 3 and first end node1 of the 4th switch S 4 joins at first node node1, and first node node1 is the output node1 of the first half-bridge inverter 130.
In an optional embodiment, the second half-bridge inverter 140 comprises the 5th switch S 5 and the 6th switch S 6.5th switch S 5 comprises first end 118 and the second end node2, and wherein the first end 118 of the 5th switch S 5 is the first end 118 of the second half-bridge inverter 140.6th switch S 6 comprises first end node2 and the second end 122, and wherein the first end node2 of the 6th switch S 6 is electrically coupled to the second end node2 of the 5th switch S 5, and the second end 122 of the 6th switch S 6 is the second end 122 of the second half-bridge inverter 140.Wherein the second end node2 of the 5th the switch S 5 and first end node2 of the 6th switch S 6 joins at Section Point node2, and Section Point node2 is the output node2 of the second half-bridge inverter 140.
In an embodiment again, DC-AC converter 100 also comprises the first electric capacity C1 and the second electric capacity C2.First electric capacity C1 comprises first end 112 and the second end 114, and wherein the first end 112 of the first electric capacity C1 is electrically coupled to the first end 112 of the first switch S 1.Second electric capacity C2 comprises first end 114 and the second end 116, and the second end 116 that wherein first end 114 of the second electric capacity C2 is electrically coupled to second end 114, the second electric capacity C2 of the first electric capacity C1 is electrically coupled to the first end 116 of second switch S2.
In another embodiment, DC-AC converter 100 also comprises the first inductance L 1 and the second inductance L 2.First inductance L 1 comprises first end node1 and the second end node3, and wherein the first end node1 of the first inductance L 1 is electrically coupled to the output node1 of the first half-bridge inverter 130.Second inductance L 2 comprises first end node2 and the second end node4, and wherein the first end node2 of the second inductance L 2 is electrically coupled to the output node2 of the second half-bridge inverter 140.
In an another embodiment again, DC-AC converter 100 also comprises the 3rd electric capacity C3 and the 4th electric capacity C4.3rd electric capacity C3 comprises first end node3 and the second end 114, and wherein the first end node3 of the 3rd electric capacity C3 is electrically coupled to the second end node3 of the first inductance L 1, and second end 114 of the 3rd electric capacity C3 is electrically coupled to second end 114 of the first electric capacity C1.4th electric capacity C4 comprises first end 114 and the second end node4, and the second end node4 that wherein first end 114 of the 4th electric capacity C4 is electrically coupled to first end the 114, four electric capacity C4 of the second electric capacity C2 is electrically coupled to the second end node4 of the second inductance L 2.Wherein the second end node3 of the first inductance L 1 and first end node3 of the 3rd electric capacity C3 joins in the 3rd node node3, and the second end node4 of the second inductance L 2 and second end node4 of the 4th electric capacity C4 joins in the 4th node node4, by means of making output AC power source between the 3rd node node3 and the 4th node node.
In operation, the first inductance L 1 and the 3rd electric capacity C3 form the first inductance capacitor filtering circuit 150.First inductance capacitor filtering circuit 150 is electrically coupled to the output node1 of the first half-bridge inverter 130, and carries out filtering in order to the out-put supply exported the output node1 of the first half-bridge inverter 130.
In addition, the second inductance L 2 and the 4th electric capacity C4 form the second inductance capacitor filtering circuit 160.Second inductance capacitor filtering circuit 160 is electrically coupled to the output node2 of the second half-bridge inverter 140, and carries out filtering in order to the out-put supply exported the output node2 of the second half-bridge inverter 140.
Fig. 2 is the circuit diagram illustrating a kind of DC-AC converter 200 according to another embodiment of the present invention.As shown in Figure 2, first to the 6th switch S 1 ~ S6 of the embodiment of the present invention can adopt power switch, such as bipolar transistor (BipolarJunctionTransistor, BJT), mos field effect transistor (MOSField-EffectTransistor, MOSFET), insulated gate bipolar transistor (InsulatedGateBipolarTransistor, IGBT) ... Deng, the right embodiment of the present invention is not as limit, anyly be familiar with this those skilled in the art, without departing from the spirit and scope of the present invention, switch module is used as when optionally adopting suitable assembly.
It should be noted that at this, in Fig. 1 and Fig. 2, all use the mode of being connected with the second half-bridge inverter 140 by the first half-bridge inverter 130, form DC-AC converter 100,200.This is owing to being used alone a half-bridge inverter to carry out the words of the conversion of DC-AC, then the output voltage of half-bridge inverter is only the half of its input voltage, therefore, need use two half-bridge inverter series connection, together carry out the conversion of DC-AC through two half-bridges against closet, and export complete voltage.
Fig. 3 illustrates a kind of drive singal framework 300 schematic diagram according to yet another embodiment of the invention.
Please refer to Fig. 3, drive singal framework 300 comprises the first comparator 310, second comparator 320, the 3rd comparator 330 and an absolute value encoder 340.The non-oppisite phase end of the first comparator 310 is electrically coupled to the first reference voltage source Vref1 through absolute value encoder 340, the end of oppisite phase of the first comparator 310 in order to receive triangular wave Vtri, and compares rear output first switching signal Signal1 and second switch signal Signal2 via the first comparator 310.
In addition, the non-oppisite phase end of the second comparator 320 is electrically coupled to the first reference voltage source Vref1, the end of oppisite phase of the second comparator 320 is in order to receive triangular wave Vtri, and via the second comparator 320 compare rear output one first output signal be the 3rd switching signal Signal3, aforementioned first output signal via after inverter export the 4th switching signal Signal4.
Moreover, the non-oppisite phase end of the 3rd comparator 330 is electrically coupled to the second reference voltage source Vref2, the end of oppisite phase of the 3rd comparator 330 is in order to receive triangular wave Vtri, and via the 3rd comparator 330 compare rear output one second output signal be the 5th switching signal Signal5, aforementioned second output signal via after inverter export the 6th switching signal Signal6.The wherein phase 180 degree of the first reference voltage Vsin1 that provides of the second reference voltage Vsin2 of providing of the second reference voltage source Vref2 and the first reference voltage source Vref1.
In operation, the waveform of the in Fig. 3, drive singal framework 300 exports first to the 6th switching signal Signal1 ~ Signal6 as shown in Figure 4.Namely first to the 6th switch S 1 ~ S6 in DC-AC converter 100,200 in Fig. 1 and Fig. 2 of the present invention controlled by first to the 6th switching signal Signal1 ~ Signal6.
Please also refer to Fig. 1 and Fig. 4, in an optional embodiment, first switch S 1 is in order to receive the first switching signal Signal1 to switch, second switch S2 is in order to receive second switch signal Signal2 to switch, and the first switch S 1 is opened simultaneously or closes by the control of the first switching signal Signal1 and second switch signal Signal2 with second switch S2 respectively.
In another another embodiment, 3rd switch S 3 is in order to receive the 3rd switching signal Signal3 to switch, 4th switch S 4 is in order to receive the 4th switching signal Signal4 to switch, 3rd switch S 3 and the 4th switch S 4 are respectively by the control of the 3rd switching signal Signal3 and the 4th switching signal Signal4, when 3rd switch S 3 is opened, 4th switch S 4 is closed, and when the 3rd switch S 3 is closed, the 4th switch S 4 is opened.
In another embodiment again, first switching signal Signal1, second switch signal Signal2 and the 3rd switching signal Signal3 to be compared with triangular wave Vtri by the first reference voltage Vsin1 and produced, when the first reference voltage Vsin1 is in positive half cycle, the first switch S 1, second switch S2 and the 3rd switch S 3 are subject to the control of the first switching signal Signal1, second switch signal Signal2 and the 3rd switching signal Signal3 respectively and open simultaneously or close.
In another embodiment again, 5th switch S 5 is in order to receive the 5th switching signal Signal5 to switch, 6th switch S 6 is in order to receive the 6th switching signal Signal6 to switch, 5th switch S 5 and the 6th switch S 6 are respectively by the control of the 5th switching signal Signal5 and the 6th switching signal Signal6, when 5th switch S 5 is opened, 6th switch S 6 is closed, and when the 5th switch S 5 is closed, the 6th switch S 6 is opened.
In an optional embodiment, 5th switching signal Signal5 to be compared with triangular wave Vtri by the second reference voltage Vsin2 and produced, when the first reference voltage Vsin1 is in negative half period, the first switch S 1, second switch S2 and the 5th switch S 5 are subject to the control of the first switching signal Signal1, second switch signal Signal2 and the 5th switching signal Signal5 respectively and open simultaneously or close.
By the type of drive of the invention described above embodiment, the mode of operation of DC-AC converter 100,200 is as described below: when the first reference voltage Vsin1 is in positive half cycle, first switch S 1, second switch S2, the 3rd switch S 3 and the 6th switch S 6 conducting, now the first inductance L 1 and the second inductance L 2 carry out energy storage, and the energy of input is sent to output; When the first switch S 1, second switch S2 and the 3rd switch S 3 are ended, inductive current can flow through the 4th switch S 4 (if the 4th switch S 4 is IGBT, then inductive current flows through its body diode) and the 6th switch S 6, and continue the energy of input to be sent to output.
Moreover, when the first reference voltage Vsin1 is in negative half period, the first switch S 1, second switch S2, the 4th switch S 4 and the 5th switch S 5 conducting, now the first inductance L 1 and the second inductance L 2 carry out energy storage, and the energy of input is sent to output; When the first switch S 1, second switch S2 and the 5th switch S 5 are ended, inductive current can flow through the 6th switch S 6 (if the 6th switch S 6 is IGBT, then inductive current flows through its body diode) and the 4th switch S 4, and continue the energy of input to be sent to output.
Please refer to Fig. 1, DC-AC converter 100,200 uses above-mentioned type of drive can obtain following result: Van and the Vbn shown in Fig. 1 after tested, the numerical value that can obtain Van and Vbn adds up to zero, therefore, the level producing leakage current maintains certain value, can not change to some extent along with the change of type of drive, thus, the generation of leakage current can be reduced.In addition, DC-AC converter 100,200 uses two half-bridge inverters to do PWM modulation with the phase shift of 180 degree separately, and coordinate respective by-pass switch (by-pass switch of the first half-bridge inverter 130 is the first switch S 1, and the by-pass switch of the second half-bridge inverter 140 is second switch S2) to reduce the switch cost of inverter.
From the invention described above execution mode, application the present invention has following advantages.The embodiment of the present invention by providing a kind of DC-AC converter, so as to improve inverter adopt bipolarity to switch time, switch cost is comparatively large with inefficient problem, and improves inverter when adopting unipolarity to switch, the problem that leakage current is larger.
Although the present invention discloses as above with execution mode; so itself and be not used to limit the present invention; anyly be familiar with this those skilled in the art; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, the scope that therefore protection scope of the present invention ought define depending on appending claims is as the criterion.
Claims (15)
1. a DC-AC converter, is characterized in that, comprises:
One first switch, comprises a first end and one second end;
One second switch, comprises a first end and one second end, in order to receive a DC power supply between this first end of this first switch and this first end of this second switch;
One first half-bridge inverter, comprise a first end, one second end and an output, wherein this first end of this first half-bridge inverter is electrically coupled to this second end of this first switch, and this second end of this first half-bridge inverter is electrically coupled to this second end of this second switch; And
One second half-bridge inverter, comprise a first end, one second end and an output, wherein this first end of this second half-bridge inverter is electrically coupled to this second end of this first switch, this second end of this second half-bridge inverter is electrically coupled to this second end of this second switch, wherein between this output of this first half-bridge inverter and this output of this second half-bridge inverter in order to export an AC power;
This first half-bridge inverter also comprises one the 3rd switch, comprise a first end and one second end, wherein this first end of the 3rd switch is this first end of this first half-bridge inverter, this first half-bridge inverter also comprises one the 4th switch, comprise a first end and one second end, wherein this first end of the 4th switch is electrically coupled to this second end of the 3rd switch, and this second end of the 4th switch is this second end of this first half-bridge inverter;
This second half-bridge inverter also comprises one the 6th switch, comprise a first end and one second end, wherein this first end of the 6th switch is electrically coupled to this output of this second half-bridge inverter, and this second end of the 6th switch is this second end of this second half-bridge inverter;
This first switch is in order to receive one first switching signal, and this second switch is in order to receive a second switch signal, and the 3rd switch is in order to receive one the 3rd switching signal, and the 4th switch is in order to receive one the 4th switching signal;
This first switching signal, this second switch signal and the 3rd switching signal produced by one first reference voltage and a triangle wave, wherein this triangle wave frequency is higher than the frequency of this first reference voltage, when this first reference voltage is in positive half cycle, 6th switch conduction, this first switch, this second switch and the 3rd switch are respectively by this first switching signal, the control of this second switch signal and the 3rd switching signal and open simultaneously or close, 3rd switch and the 4th switch are subject to the control of the 3rd switching signal and the 4th switching signal respectively, when 3rd switch cuts out, 4th switch open.
2. DC-AC converter according to claim 1, is characterized in that, this second end of the 3rd switch and this first end of the 4th switch join at a first node, and this first node is this output of this first half-bridge inverter.
3. DC-AC converter according to claim 2, is characterized in that, this second half-bridge inverter also comprises:
One the 5th switch, comprises a first end and one second end, and wherein this first end of the 5th switch is this first end of this second half-bridge inverter;
Wherein this second end of the 5th switch and this first end of the 6th switch join at a Section Point, and this Section Point is this output of this second half-bridge inverter.
4. DC-AC converter according to claim 1, is characterized in that, also comprises:
One first electric capacity, comprise a first end and one second end, wherein this first end of this first electric capacity is electrically coupled to this first end of this first switch; And
One second electric capacity, comprises a first end and one second end, and wherein this first end of this second electric capacity is electrically coupled to this second end of this first electric capacity, and this second end of this second electric capacity is electrically coupled to this first end of this second switch.
5. DC-AC converter according to claim 4, is characterized in that, also comprises:
One first inductance, comprise a first end and one second end, wherein this first end of this first inductance is electrically coupled to this output of this first half-bridge inverter; And
One second inductance, comprise a first end and one second end, wherein this first end of this second inductance is electrically coupled to this output of this second half-bridge inverter.
6. DC-AC converter according to claim 5, is characterized in that, also comprises:
One the 3rd electric capacity, comprises a first end and one second end, and wherein this first end of the 3rd electric capacity is electrically coupled to this second end of this first inductance, and this second end of the 3rd electric capacity is electrically coupled to this second end of this first electric capacity; And
One the 4th electric capacity, comprise a first end and one second end, wherein this first end of the 4th electric capacity is electrically coupled to this first end of this second electric capacity, and this second end of the 4th electric capacity is electrically coupled to this second end of this second inductance,
Wherein this second end of this first inductance and this first end of the 3rd electric capacity join in one the 3rd node, and this second end of this second inductance and this second end of the 4th electric capacity join in one the 4th node, export this AC power by means of making between the 3rd node and the 4th node.
7. DC-AC converter according to claim 3, is characterized in that, this first switch and this second switch are subject to the control of this first switching signal and this second switch signal respectively and open simultaneously or close.
8. DC-AC converter according to claim 7, it is characterized in that, 5th switch is in order to receive one the 5th switching signal, 6th switch is in order to receive one the 6th switching signal, 5th switch and the 6th switch are subject to the control of the 5th switching signal and the 6th switching signal respectively, when making the 5th switch open, the 6th switch cuts out.
9. DC-AC converter according to claim 8, it is characterized in that, 5th switching signal produced by one second reference voltage and this triangle wave, the phase of this second reference voltage and this first reference voltage 180 degree, when this first reference voltage is in negative half period, this first switch, this second switch and the 5th switch are opened simultaneously by the control of this first switching signal, this second switch signal and the 5th switching signal or close respectively.
10. a DC-AC converter, is characterized in that, comprises:
One first switch, in order to receive one first switching signal to switch;
One second switch, in order to receive a second switch signal to switch;
One first half-bridge inverter, in order to being an out-put supply by a direct current Power convert, and provides this out-put supply to give an AC power, comprises:
One the 3rd switch, is electrically coupled to this first switch, and in order to receive one the 3rd switching signal to switch;
One the 4th switch, is electrically coupled to the 3rd switch and this second switch, and joins in a first node with the 3rd switch, and the 4th switch is in order to receive one the 4th switching signal to switch; And
One first output, is electrically coupled to this first node, and in order to export this out-put supply; And
One second half-bridge inverter, in order to this DC power supply is converted to an out-put supply, and provides this out-put supply to give this AC power, comprises:
One the 5th switch, is electrically coupled to this first switch, and in order to receive one the 5th switching signal to switch;
One the 6th switch, is electrically coupled to the 5th switch and this second switch, and joins in a Section Point with the 5th switch, and the 6th switch is in order to receive one the 6th switching signal to switch; And
One second output, is electrically coupled to this Section Point, and in order to export this out-put supply;
This first switching signal, this second switch signal and the 3rd switching signal produced by one first reference voltage and a triangle wave, wherein this triangle wave frequency is higher than the frequency of this first reference voltage, when this first reference voltage is in positive half cycle, 6th switch conduction, this first switch, this second switch and this three switch are respectively by this first switching signal, the control of this second switch signal and this three switching signal and open simultaneously or close, 3rd switch and the 4th switch are subject to the control of the 3rd switching signal and the 4th switching signal respectively, when 3rd switch cuts out, 4th switch open.
11. DC-AC converter according to claim 10, is characterized in that, this first switch and this second switch are subject to the control of this first switching signal and this second switch signal respectively and open simultaneously or close.
12. DC-AC converter according to claim 11, is characterized in that, the 5th switch and the 6th switch are subject to the control of the 5th switching signal and the 6th switching signal respectively, and when making the 5th switch open, the 6th switch cuts out.
13. DC-AC converter according to claim 12, it is characterized in that, 5th switching signal produced by one second reference voltage and this triangle wave, the phase of this second reference voltage and this first reference voltage 180 degree, when this first reference voltage is in negative half period, this first switch, this second switch and the 5th switch are opened simultaneously by the control of this first switching signal, this second switch signal and the 5th switching signal or close respectively.
14. DC-AC converter according to claim 10, is characterized in that, also comprise:
One first inductance capacitor filtering circuit, is electrically coupled to this first output of this first half-bridge inverter, and in order to carry out filtering to this out-put supply.
15. DC-AC converter according to claim 10, is characterized in that, also comprise:
One second inductance capacitor filtering circuit, is electrically coupled to this second output of this second half-bridge inverter, and in order to carry out filtering to this out-put supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110205041.0A CN102882398B (en) | 2011-07-13 | 2011-07-13 | DC-AC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110205041.0A CN102882398B (en) | 2011-07-13 | 2011-07-13 | DC-AC converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102882398A CN102882398A (en) | 2013-01-16 |
| CN102882398B true CN102882398B (en) | 2016-02-03 |
Family
ID=47483603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110205041.0A Active CN102882398B (en) | 2011-07-13 | 2011-07-13 | DC-AC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102882398B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2950438B1 (en) | 2013-12-04 | 2019-01-09 | Sungrow Power Supply Co., Ltd. | Five level inverter |
| 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 |
| CN105991058B (en) * | 2015-01-29 | 2019-01-04 | 台达电子工业股份有限公司 | DC communication conversion equipment and its operating method |
| CN108347180B (en) * | 2017-01-24 | 2019-11-05 | 台达电子企业管理（上海）有限公司 | The method that cascade converter system and its converter module put into operation |
| CN112336448B (en) * | 2020-11-05 | 2021-12-28 | 上海倍可达医疗科技有限公司 | Irreversible electroporation circuit and irreversible electroporation apparatus for heart |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420127A (en) * | 2007-10-23 | 2009-04-29 | 上海久隆电力科技有限公司 | Harmonic treating apparatus with reactive power compensation |
| CN101707442A (en) * | 2009-11-16 | 2010-05-12 | 浙江大学 | Transformer-free inverter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004030912B3 (en) * | 2004-06-25 | 2006-01-19 | Sma Technologie Ag | Method for converting a direct electrical voltage of a DC voltage source, in particular a photovoltaic DC voltage source into an AC voltage |
| ES2541772T3 (en) * | 2006-07-31 | 2015-07-24 | Ingeteam Power Technology, S.A. | Single phase inverter circuit for conditioning and converting direct current electrical energy into alternating current electrical energy |
-
2011
- 2011-07-13 CN CN201110205041.0A patent/CN102882398B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420127A (en) * | 2007-10-23 | 2009-04-29 | 上海久隆电力科技有限公司 | Harmonic treating apparatus with reactive power compensation |
| CN101707442A (en) * | 2009-11-16 | 2010-05-12 | 浙江大学 | Transformer-free inverter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102882398A (en) | 2013-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101667789B (en) | Inverter circuit used for solar energy photovoltaic grid connection and device thereof | |
| CN102882398B (en) | DC-AC converter | |
| CN202535290U (en) | Photovoltaic inverter circuit | |
| CN103283135A (en) | Electric power converter | |
| CN107210684A (en) | Five level topology units and five-electrical level inverter | |
| CN102223101A (en) | Control method for dual-bucking full-bridge grid-connected inverter | |
| CN102946205A (en) | Three-level inverter and power supply equipment | |
| CN102005962A (en) | Buck-boost grid-connected inverter and control method thereof | |
| CN104333248A (en) | Multilevel single-phase inverter and multilevel three-phase inverter adopting novel three-terminal switching network | |
| CN102969898B (en) | Low-voltage wide-input three-level full-bridge converter and control method thereof | |
| CN104638971A (en) | Photovoltaic grid-connected inverter and control method thereof | |
| CN108599604A (en) | The single-phase seven level inverse conversions electric appliance of one kind and its pwm signal modulator approach | |
| CN105281361A (en) | Five-level double-step down grid-connected inverter | |
| CN108141147A (en) | The five-electrical level inverter topological circuit of high voltage gain | |
| CN102055353B (en) | Three-switch double-capacitor three-phase alternating current (AC)-direct current (DC) converter with high power factor | |
| CN101860249A (en) | Three-level inverter and zero-crossing switching logic control method thereof | |
| CN103219912A (en) | Control method suitable for universal input voltage buck-boost grid-connected inverter | |
| CN105808901A (en) | Method for determining on-state loss of modularized multilevel converter | |
| CN104333246A (en) | Cuk-Sepic single-stage inverter | |
| CN202094816U (en) | Solar inverter circuit and inverter | |
| CN105471296A (en) | Inverter circuit | |
| CN102983767A (en) | Low-additional-voltage zero-voltage switch energy storage bridge type inverter and modulation method | |
| CN105375780A (en) | Vehicle soft switching inversion power supply and voltage conversion circuit thereof | |
| CN103001515B (en) | Low auxiliary voltage zero voltage switch energy storage semi-bridge type inverter and modulator approach | |
| CN102843054B (en) | Single-phase five-level inverter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |