CN202353489U - Inverter - Google Patents
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- CN202353489U CN202353489U CN2011202727099U CN201120272709U CN202353489U CN 202353489 U CN202353489 U CN 202353489U CN 2011202727099 U CN2011202727099 U CN 2011202727099U CN 201120272709 U CN201120272709 U CN 201120272709U CN 202353489 U CN202353489 U CN 202353489U
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- switching device
- inverter
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Abstract
The utility model discloses an inverter for converting direct-current power output from a direct-current power supply to alternating-current power. The inverter comprises six switching elements and two diodes, wherein the first switching element, the first diode and the third switching element are connected in series; the second switching element, the second diode and the fourth switching element are connected in series; the first end of the fifth switching element is connected with the second end of the first switching element and the cathode of the first diode; the second end of the fifth switching element is connected with the anode of the second diode and the first end of the fourth switching element; the first end of the sixth switching element is connected with the second end of the second switching element and the cathode of the second diode; the second end of the sixth switching element is connected with the anode of the first diode and the first end of the third switching element; the first end of the first switching element and the first end of the second switching element are respectively connected with the positive end of the direct-current power supply; and the second end of the third switching element and the second end of the fourth switching element are respectively connected with the negative end of the direct-current power supply. The inverter can effectively restrain common-mode leakage current and improve the energy conversion efficiency.
Description
Technical field
The utility model relates to the voltage transitions technical field, is specifically related to a kind of inverter.
Background technology
At present in the device of converting direct-current voltage into alternating-current voltage; In order to improve conversion efficiency as far as possible; Exchanging the scheme that end can adopt transless to be incorporated into the power networks, the problem that thereupon needs to pay close attention to is DC power supply (for example solar panel) existence and the interference of the common mode leakage current that brings of parasitic capacitance over the ground, promptly; Time variant voltage acted on the parasitic capacitance when action of switching device possibly produce high frequency, and then caused leakage current generating also possibly go beyond the scope.High-frequency leakage current can reduce system effectiveness, and the infringement output quality of power supply increases system's electromagnetic interference, and the person is threatened, and forms potential safety hazard, and is prone to cause the protective device of leakage current escape, influences the reliability of whole system.
If conventional full bridge inverter adopts bipolar modulated, can obtain stable common-mode voltage, the common mode leakage current is less, but conversion efficiency is poor, and inductive current pulsation is big, needs to adopt bigger filter inductance; If full bridge inverter adopts the one pole modulation, then the differential mode characteristic good receives publicity as the input direct voltage utilance is high, the filter inductance current pulsation is little and efficient is high, but produces the common-mode voltage of switching frequency pulsation simultaneously, and then produces the common mode leakage current.
Can address the above problem to a certain extent though increase the leakage current absorption plant, can bring problems such as increasing cost, reduction energy conversion efficiency again.
The utility model content
The utility model embodiment provides a kind of inverter to the problem that above-mentioned prior art exists, with common-mode voltage, inhibition common mode leakage current, the raising energy conversion efficiency of avoiding producing the switching frequency pulsation.
For this reason, the utility model embodiment provides following technical scheme:
A kind of inverter is used for converting the direct current of DC power supply output to alternating current, and comprising: six switching devices and two diodes, each switching device have one first end and one second end respectively;
The first switching device S1, the first diode D1 and the 3rd switching device S3 series connection;
Second switch device S2, the second diode D2 and the 4th switching device S4 series connection;
First end of first end of the first switching device S1 and second switch device S2 connects the anode of said DC power supply respectively; Second end of second end of the 3rd switching device S3 and the 4th switching device S4 connects the negative terminal of said DC power supply respectively;
First end of the 5th switching device S5 connects second end of the first switching device S1 and the negative electrode of the first diode D1, and second end connects first end of the 4th switching device S4 and the anode of the second diode D2;
First end of the 6th switching device S6 connects second end of second switch device S2 and the negative electrode of the second diode D2, and second end connects first end of the 3rd switching device S3 and the anode of the first diode D1;
First end of first end of the 5th switching device S5 and the 6th switching device S6 is two outputs of said inverter.
Preferably, the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 are the switching tube of symmetry.
Preferably, the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 are MOSFET.
Preferably; The preceding half period in a work period; The first switching device S1 and the 3rd switching device S3 be with synchronous high-frequency pulse signal trigger action, the 6th switching device S6 conducting, and second switch device S2, the 4th switching device S4 and the 5th switching device S5 turn-off; In the later half cycle in a work period, second switch device S2 and the 4th switching device S4 be with synchronous high-frequency pulse signal trigger action, the 5th switching device S5 conducting, and the first switching device S1, the 3rd switching device S3 and the 6th switching device S6 turn-off.
Preferably, said high-frequency pulse signal is a pwm pulse signal.
Preferably, said high-frequency pulse signal is the pulse signal in the KHz scope.
Preferably, said inverter also comprises: energy-storage travelling wave tube is connected the two ends of said DC power supply.
Preferably, said energy-storage travelling wave tube is an electric capacity.
Preferably; Said inverter also comprises: first inductance L 1 and second inductance L 2; First end of first inductance L 1 connects first end of the 5th switching device S5; First end of second inductance L 2 connects first end of the 6th switching device S6, and second end of second end of first inductance L 1 and second inductance L 2 is connected to the two ends of civil power or AC load.
The inverter that the utility model embodiment provides can make continuous current circuit and DC side break off fully, effectively suppresses the common mode leakage current, improves energy conversion efficiency.
Description of drawings
In order to be illustrated more clearly in the application embodiment or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use among the embodiment below; Obviously; The accompanying drawing that describes below only is some embodiment that put down in writing in the utility model, for those of ordinary skills, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the circuit diagram of the utility model embodiment inverter;
Fig. 2 is the drive signal sketch map of each switching device in the utility model embodiment inverter course of work;
Fig. 3 is the utility model embodiment inverter at the current circuit sketch map during in load voltage positive half period pwm pulse triggering and conducting under the drive signal shown in Figure 2;
Fig. 4 is that the utility model embodiment inverter is at the current circuit sketch map when load voltage positive half period pwm pulse turn-offs under the drive signal shown in Figure 2;
Fig. 5 is the utility model embodiment inverter at the current circuit sketch map during in load voltage negative half-cycle pwm pulse triggering and conducting under the drive signal shown in Figure 2;
Fig. 6 is that the utility model embodiment inverter is at the current circuit sketch map when load voltage negative half-cycle pwm pulse turn-offs under the drive signal shown in Figure 2.
Embodiment
In order to make those skilled in the art person understand the scheme of the utility model embodiment better, the utility model embodiment is done further detailed description below in conjunction with accompanying drawing and execution mode.
As shown in Figure 1, be the circuit diagram of the utility model embodiment inverter.
This inverter 2 is used for converting the direct voltage of DC power supply 1 output to alternating current, offers civil power or AC load 3.
The first switching device S1, the first diode D1 and the 3rd switching device S3 series connection;
Second switch device S2, the second diode D2 and the 4th switching device S4 series connection;
First end of the 5th switching device S5 connects second end of the first switching device S1 and the negative electrode of the first diode D1, and second end connects first end of the 4th switching device S4 and the anode of the second diode D2;
First end of the 6th switching device S6 connects second end of second switch device S2 and the negative electrode of the second diode D2, and second end connects first end of the 3rd switching device S3 and the anode of the first diode D1;
First end of first end of the 5th switching device S5 and the 6th switching device S6 is as two outputs of inverter 2.
This inverter 2 also can further comprise: be connected the energy storage device at the two ends of said DC power supply, this energy storage device can be an electric capacity, capacitor C 1 as shown in fig. 1.
As shown in Figure 1, this inverter 2 also can further comprise: two inductance L 1, L2, wherein:
First end of first inductance L 1 connects first end of the 5th switching device S5; First end of second inductance L 2 connects first end of the 6th switching device S6, and second end of second end of first inductance L 1 and second inductance L 2 is connected to the two ends of civil power or AC load.
In this embodiment, first end of first end of the first switching device S1 and second switch device S2 connects the anode of DC power supply 1 respectively; Second end of second end of the 3rd switching device S3 and the 4th switching device S4 connects the negative terminal of said DC power supply respectively.
The above-mentioned first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 are the switching tube of symmetry, and such as MOSFET, correspondingly, first end of above-mentioned switching device is meant that the D utmost point of MOSFET, second end are meant the S utmost point of MOSFET.
Above-mentioned the 5th switching device S5 and the 6th switching device S6 can be IGBT, and correspondingly, first end of the 5th switching device S5, the 6th switching device S6 is meant collector electrode, and second end is meant emitter.
Above-mentioned DC power supply 1 can be a generator VDC, such as solar generator.
A work period of inverter shown in Figure 1 was made up of preceding half period and later half cycle; The corresponding course of work of inverter in a work period is divided into two stages, is respectively that load voltage is working stage and the load voltage working stage when bearing in correct time.
In the work period, the drive signal waveform of each switching tube of inverter is as shown in Figure 2, wherein, and V
AcVoltage signal in the expression load.
(T representes a switch periods at phase I 0～T/2; It is the load voltage signal cycle); Corresponding to load voltage is the working stage in correct time; The first switching device S1 and the 3rd switching device S3 be with synchronous high-frequency pulse signal trigger action, the 6th switching device S6 conducting, and second switch device S2, the 4th switching device S4 and the 5th switching device S5 turn-off.
At second stage T/2～T; Working stage when being negative corresponding to load voltage; Second switch device S2 and the 4th switching device S4 be with synchronous high-frequency pulse signal trigger action, the 5th switching device S5 conducting, and the first switching device S1, the 3rd switching device S3 and the 6th switching device S6 turn-off.
Above-mentioned high-frequency pulse signal is a pwm pulse signal, such as being the pulse signal in the KHz scope.
Be example with modulation system shown in Figure 2 below, the operation principle of the utility model embodiment inverter is elaborated.
For convenience, define following parameter below earlier:
V
DcBe the output voltage of DC power supply, V
AoBe the voltage that a point and O among the figure are ordered, V
BoBe the voltage that b point and O among the figure are ordered, V
CMBe common-mode voltage, i
CMBe common mode leakage current, C
CMBe DC power supply 1 the appearance value of parasitic capacitance, i.e. common mode capacitance appearance value over the ground.
(T representes a switch periods at phase I 0～T/2; It is the load voltage signal cycle); Corresponding to load voltage is the working stage in correct time; The first switching device S1 and the 3rd switching device S3 be with synchronous high-frequency pulse signal trigger action, the 6th switching device S6 conducting, and second switch device S2, the 4th switching device S4 and the 5th switching device S5 turn-off.
As the first switching device S1, when the 3rd switching device S3 opens, because the cathode voltage of the first diode D1 is higher than anode voltage, therefore the first diode D1 keeps blocking state, does not have electric current to flow through, and current circuit is: VDC
+→ S1 → L1 → load → L2 → S6 → S3 → VDC
-, as shown in Figure 3.
At this moment, V
Ao=V
Dc, V
Bo=0, the common-mode voltage of inverter is:
V
CM＝(V
ao+V
bo)/2＝(V
dc+0)/2＝V
dc/2 (1)
As the first switching device S1, when the 3rd switching device S3 turn-offs; Because the electric current among inductance L 1 and the L2 can not suddenly change; The voltage of the first diode D1 is reverse, and the first diode D1 transfers opening state to by blocking state, has formed continuous current circuit; Current circuit becomes: L1 → load → L2 → S6 → D1 → L1, and as shown in Figure 4.
At this moment, V
Ao=V
Dc/ 2, V
Bo=V
Dc/ 2, the common-mode voltage of inverter is:
V
CM＝(V
ao+V
bo)/2＝(V
dc/2+V
dc/2)/2＝V
dc/2 (2)
It is thus clear that inverter is in the above-mentioned phase I, common-mode voltage remains unchanged, and is V
Dc/ 2.
At second stage T/2～T; Working stage when being negative corresponding to load voltage; Second switch device S2 and the 4th switching device S4 be with synchronous high-frequency pulse signal trigger action, the 5th switching device S5 conducting, and the first switching device S1, the 3rd switching device S3 and the 6th switching device S6 turn-off.
As second switch device S2, when the 4th switching device S4 opens, because the cathode voltage of the second diode D2 is higher than anode voltage, the second diode D2 keeps off state, does not have electric current to flow through, and current circuit is VDC
+→ S2 → L2 → load → L1 → S5 → S4 → VDC
-, as shown in Figure 5.
At this moment, V
Ao=0, V
Bo=V
Dc, common-mode voltage is:
V
CM＝(V
ao+V
bo)/2＝(0+V
dc)/2＝V
dc/2； (3)
As second switch device S2, when the 4th switching device S4 turn-offs; Because the electric current among inductance L 1 and the L2 can not suddenly change; The voltage of the second diode D2 is reverse, and the second diode D2 transfers opening state to by blocking state, has formed continuous current circuit; Current circuit becomes: L2 → load → L1 → S5 → D2 → L2, and as shown in Figure 6.
At this moment, V
Ao=V
Dc/ 2, V
Bo=V
Dc/ 2, common-mode voltage is:
V
CM＝(V
ao+V
bo)/2＝(V
dc/2+V
dc/2)/2＝V
dc/2 (4)
It is thus clear that inverter is in above-mentioned second stage, common-mode voltage remains unchanged, and is V
Dc/ 2.
Can find out common-mode voltage V by above-mentioned analysis to the inverter course of work
CMAll the time invariable in entire work process, by common-mode voltage V
CMMode ship current i together
CMBetween relation (i
CM=C
CMDV
CM/ dt) can know common mode leakage current i
CMBe always zero.
More than the utility model embodiment has been carried out detailed introduction, used embodiment among this paper the utility model set forth, the explanation of above embodiment just is used to help to understand the equipment of the utility model; Simultaneously, for one of ordinary skill in the art, according to the thought of the utility model, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as the restriction to the utility model.
Claims (9)
1. an inverter is used for converting the direct current of DC power supply output to alternating current, it is characterized in that comprise: six switching devices and two diodes, each switching device have one first end and one second end respectively;
First switching device (S1), first diode (D1) and the 3rd switching device (S3) series connection;
Second switch device (S2), second diode (D2) and the 4th switching device (S4) series connection;
First end of first end of first switching device (S1) and second switch device (S2) connects the anode of said DC power supply respectively; Second end of second end of the 3rd switching device (S3) and the 4th switching device (S4) connects the negative terminal of said DC power supply respectively;
First end of the 5th switching device (S5) connects second end of first switching device (S1) and the negative electrode of first diode (D1), and second end connects first end of the 4th switching device (S4) and the anode of second diode (D2);
First end of the 6th switching device (S6) connects second end of second switch device (S2) and the negative electrode of second diode (D2), and second end connects first end of the 3rd switching device (S3) and the anode of first diode (D1);
First end of first end of the 5th switching device (S5) and the 6th switching device (S6) is two outputs of said inverter.
2. inverter according to claim 1 is characterized in that, first switching device (S1), second switch device (S2), the 3rd switching device (S3) and the 4th switching device (S4) are the switching tube of symmetry.
3. inverter according to claim 2 is characterized in that, said first switching device (S1), second switch device (S2), the 3rd switching device (S3) and the 4th switching device (S4) are MOSFET.
4. according to each described inverter of claim 1 to 3; It is characterized in that; The preceding half period in a work period; First switching device (S1) and the 3rd switching device (S3) be with synchronous high-frequency pulse signal trigger action, the 6th switching device (S6) conducting, and second switch device (S2), the 4th switching device (S4) and the 5th switching device (S5) turn-off; The later half cycle in a work period; Second switch device (S2) and the 4th switching device (S4) are with synchronous high-frequency pulse signal trigger action; The 5th switching device (S5) conducting, first switching device (S1), the 3rd switching device (S3) and the 6th switching device (S6) turn-off.
5. inverter according to claim 4 is characterized in that, said high-frequency pulse signal is a pwm pulse signal.
6. inverter according to claim 4 is characterized in that, said high-frequency pulse signal is the pulse signal in the KHz scope.
7. inverter according to claim 1 is characterized in that, said inverter also comprises:
Energy-storage travelling wave tube is connected the two ends of said DC power supply.
8. inverter according to claim 7 is characterized in that, said energy-storage travelling wave tube is an electric capacity.
9. according to claim 7 or 8 described inverters; It is characterized in that; Said inverter also comprises: first inductance (L1) and second inductance (L2); First end of first inductance (L1) connects first end of the 5th switching device (S5), and first end of second inductance (L2) connects first end of the 6th switching device (S6), and second end of second end of first inductance (L1) and second inductance (L2) is connected to the two ends of civil power or AC load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202727099U CN202353489U (en) | 2011-07-29 | 2011-07-29 | Inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202727099U CN202353489U (en) | 2011-07-29 | 2011-07-29 | Inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353489U true CN202353489U (en) | 2012-07-25 |
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ID=46542450
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202727099U Expired - Lifetime CN202353489U (en) | 2011-07-29 | 2011-07-29 | Inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291032A (en) * | 2011-07-29 | 2011-12-21 | 阳光电源股份有限公司 | Inverter |
| CN109327155A (en) * | 2017-07-31 | 2019-02-12 | 比亚迪股份有限公司 | DC voltage turns inverter, method and the inverter of alternating voltage |
-
2011
- 2011-07-29 CN CN2011202727099U patent/CN202353489U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102291032A (en) * | 2011-07-29 | 2011-12-21 | 阳光电源股份有限公司 | Inverter |
| CN109327155A (en) * | 2017-07-31 | 2019-02-12 | 比亚迪股份有限公司 | DC voltage turns inverter, method and the inverter of alternating voltage |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |
|
| CX01 | Expiry of patent term |