CN102291027B - Inverter - Google Patents
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- CN102291027B CN102291027B CN 201110240141 CN201110240141A CN102291027B CN 102291027 B CN102291027 B CN 102291027B CN 201110240141 CN201110240141 CN 201110240141 CN 201110240141 A CN201110240141 A CN 201110240141A CN 102291027 B CN102291027 B CN 102291027B
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Abstract
The invention discloses an inverter for converting DC output by a DC power supply into AC. The inverter comprises six switching devices and six diodes, wherein the first switching device, the first diode and the second switching device are sequentially connected in series; the third switching device, the second diode and the fourth switching device are sequentially connected in series; the first end of the first switching device and the first end of the third switching device are respectively connected with the positive end of the DC power supply; the second end of the second switching device and the second end of the fourth switching device are respectively connected with the negative end of the DC power supply; the fourth diode and the sixth switching device are connected in series to form a first branch circuit; the third diode and the fifth switching device are connected in series to form a second branch circuit; and the second end of the first branch circuit and the second end of the second branch circuit are two output ends of the inverter. According to the inverter disclosed by the invention, common mode leakage currents can be effectively inhibited, and energy conversion efficiency can be enhanced.
Description
Technical field
The present invention relates to the voltage transitions technical field, be 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 as far as possible conversion efficiency, exchanging the scheme that can adopt transless to be incorporated into the power networks of holding, thereupon needing problems of concern is DC power supply (for example solar panel) existence of parasitic capacitance and the interference of the common mode leakage current that brings over the ground, namely, when the action of switching device may produce high frequency, time variant voltage acts on parasitic capacitance, and then causes leakage current generating and may 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 easily causes the protective device of leakage current escape, affects 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 large, needs to adopt larger filter inductance; If full bridge inverter adopts the one pole modulation, differential mode characteristic good, as high in the input direct voltage utilance, the filter inductance current pulsation is little and efficient is high receives publicity, but produce simultaneously the common-mode voltage of switching frequency pulsation, and then produce the common mode leakage current.
Can address the above problem to a certain extent although increase the leakage current absorption plant, can bring again problems such as increasing cost, reduction energy conversion efficiency.
Summary of the invention
The embodiment of the present invention provides a kind of inverter for 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 embodiment of the present invention provides following technical scheme:
A kind of inverter is used for the converting direct-current power into alternating-current power with DC power supply output, and comprising: six switching devices and six diodes, each switching device have respectively a first end and one second end;
The first switching device, the first diode and second switch device are connected in series successively;
The 3rd switching device, the second diode and the 4th switching device are connected in series successively;
The first end of the first end of the first switching device and the 3rd switching device connects respectively the anode of described DC power supply; The second end of second switch device and the second end of the 4th switching device connect respectively the negative terminal of described DC power supply;
The 4th diode and the series connection of the 6th switching device form the first branch road, the first end of the first branch road connects the second end of the 3rd switching device and the anode of the second diode, and the second end of the first branch road connects the first end of second switch device and the negative electrode of the first diode;
The 3rd diode and the series connection of the 5th switching device form the second branch road, the first end of the second branch road connects the second end of the first switching device and the anode of the first diode, and the second end of the second branch road connects the first end of the 4th switching device and the negative electrode of the second diode;
The 5th switching device is in parallel with the 5th diode reverse, and the 6th switching device is in parallel with the 6th diode reverse;
The second end of described the first branch road and the second end of described the second branch road are two outputs of described inverter.
Alternatively, the second end of the 6th switching device is the first end of the first branch road, and the anode of the 4th diode is the second end of the first branch road; The second end of the 5th switching device is the first end of the first branch road; The anode of the 3rd diode is the second end of the first branch road.
Alternatively, the negative electrode of the 4th diode is the first end of the first branch road, and the first end of the 6th switching device is the second end of the first branch road; The negative electrode of the 3rd diode is the first end of the second branch road, and the first end of the 5th switching device is the second end of the second branch road.
Preferably, the front half period within a work period, the 4th switching device is with the high-frequency pulse signal trigger action, the 5th switching device conducting, and second switch device and the 6th switching device turn-off; In the later half cycle within a work period, the second switch device is with the high-frequency pulse signal trigger action, the 6th switching device conducting, and the 4th switching device and the 5th switching device turn-off.
Alternatively, the first switching device triggers with the triggering signal of the 4th switching device, and the 3rd switching device triggers with the triggering signal of second switch device; Perhaps, the first switching device triggers with the triggering signal of the 5th switching device, and the 3rd switching device triggers with the triggering signal of the 6th switching device.
Preferably, described high-frequency pulse signal is pwm pulse signal.
Preferably, described high-frequency pulse signal is the pulse signal in the KHz scope.
Preferably, described inverter also comprises:
Energy-storage travelling wave tube is connected to the two ends of described DC power supply.
Preferably, described energy-storage travelling wave tube is electric capacity.
Preferably, described inverter also comprises: the first inductance and the second inductance, the first end of the first inductance connects the second end of the first branch road, the first end of the second inductance connects the second end of the second branch road, and the second end of the first inductance and the second end of the second inductance are connected to the two ends of described AC load.
The inverter that the embodiment of the present invention provides can make continuous current circuit and DC side disconnect fully, effectively suppresses the common mode leakage current, improves energy conversion efficiency.
Description of drawings
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment, apparently, the accompanying drawing that the following describes is only some embodiment that put down in writing in the present invention, for those of ordinary skills, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of circuit diagram of embodiment of the present invention inverter;
Fig. 2 is the another kind of circuit diagram of embodiment of the present invention inverter;
Fig. 3 is a kind of driving signal schematic representation of each switching device in the embodiment of the present invention inverter course of work;
Fig. 4 is that the another kind of each switching device in the embodiment of the present invention inverter course of work drives signal schematic representation
Fig. 5 is inverter shown in Figure 1 at the current circuit schematic diagram during in load voltage positive half period pwm pulse triggering and conducting under driving signal shown in Figure 3;
Fig. 6 is that inverter shown in Figure 1 is at the current circuit schematic diagram when load voltage positive half period pwm pulse turn-offs under driving signal shown in Figure 3;
Fig. 7 is inverter shown in Figure 1 at the current circuit schematic diagram during in load voltage negative half-cycle pwm pulse triggering and conducting under driving signal shown in Figure 3;
Fig. 8 is that inverter shown in Figure 1 is at the current circuit schematic diagram when load voltage negative half-cycle pwm pulse turn-offs under driving signal shown in Figure 3;
Fig. 9 is inverter shown in Figure 2 at the current circuit schematic diagram during in load voltage positive half period pwm pulse triggering and conducting under driving signal shown in Figure 3;
Figure 10 is that inverter shown in Figure 2 is at the current circuit schematic diagram when load voltage positive half period pwm pulse turn-offs under driving signal shown in Figure 3;
Figure 11 is inverter shown in Figure 2 at the current circuit schematic diagram during in load voltage negative half-cycle pwm pulse triggering and conducting under driving signal shown in Figure 3;
Figure 12 is that inverter shown in Figure 2 is at the current circuit schematic diagram when load voltage negative half-cycle pwm pulse turn-offs under driving signal shown in Figure 3.
Embodiment
In order to make those skilled in the art person understand better the scheme of the embodiment of the present invention, below in conjunction with drawings and embodiments, the embodiment of the present invention is described in further detail.
The inverter of the embodiment of the present invention comprises: six switching devices and six diodes, each switching device have respectively a first end and one second end.Wherein, the first switching device, the first diode and second switch device are connected in series successively; The 3rd switching device, the second diode and the 4th switching device are connected in series successively; The 4th diode and the series connection of the 6th switching device form the first branch road; The 3rd diode and the series connection of the 5th switching device form the second branch road.The 5th switching device is in parallel with the 5th diode reverse, and the 6th switching device is in parallel with the 6th diode reverse; The second end of described the first branch road and the second end of described the second branch road are two outputs of described inverter.This inverter diode of having connected on the basis of full-bridge circuit has played the afterflow effect by a diode and the second diode, and coordinates the control sequential of switching device, can avoid producing the common mode leakage current, improves energy conversion efficiency.
As shown in Figure 1, be a kind of circuit diagram of embodiment of the present invention inverter.
This inverter 21 converts the direct voltage of DC power supply 1 output to alternating current, offers AC load 3.
The first switching device S1, the first diode D1 and second switch device S2 are connected in series successively;
The 3rd switching device S3, the second diode D2 and the 4th switching device S4 are connected in series successively;
The first end of the first end of the first switching device S1 and the 3rd switching device S3 connects respectively the anode of DC power supply 1; The second end of the second end of second switch device S2 and the 4th switching device S4 connects respectively the negative terminal of DC power supply 1;
The 4th diode D4 and the 6th switching device S6 series connection form the first branch road, the first end of the first branch road connects the second end of the 3rd switching device S3 and the anode of the second diode D1, and the second end of the first branch road connects the first end of second switch device S2 and the negative electrode of the first diode D1.
The 3rd diode D3 and the 5th switching device S5 series connection form the second branch road, the first end of the second branch road connects the second end of the first switching device S1 and the anode of the first diode D1, and the second end of the second branch road connects the first end of the 4th switching device S4 and the negative electrode of the second diode D2.
The 5th switching device S5 and the 5th diode VD5 reverse parallel connection, the 6th switching device S6 and the 6th diode VD6 reverse parallel connection;
The second end of described the first branch road and the second end of described the second branch road are two outputs of described inverter.
In this embodiment, the series system of the 4th diode D4 and the 6th switching device S6 is: the negative electrode of the 4th diode D4 is connected with the first end of the 6th switching device S6, the anode of the 4th diode D4 is as the second end of the first branch road, and the second end of the 6th switching device S6 is the first end of the first branch road; The series system of the 3rd diode D3 and the 5th switching device S5 is: the negative electrode of the 3rd diode D3 is connected with the first end of the 5th switching device S5, the anode of the 3rd diode D3 is as the second end of the second branch road, and the second end of the 5th switching device is the first end of the second branch road.That is to say, the anode of the anode of the 4th diode D4 and the 3rd diode D3 is as two outputs of inverter 21.
This inverter 21 also can further comprise: be connected to the energy storage device at DC power supply 1 two ends, this energy storage device can be electric capacity, capacitor C as shown in fig. 1.
As shown in Figure 1, this inverter 21 also can further comprise: two inductance L 1, L2, wherein:
The first end of the first inductance L 1 connects second end (i.e. the anode of the 4th diode D4) of the first branch road, the first end of the second inductance L 2 connects second end (i.e. the anode of the 3rd diode D3) of the second branch road, and the second end of the second end of the first inductance L 1 and the second inductance L 2 is connected to the two ends of AC load 3.
Above-mentioned the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 are symmetrical switching tube, and such as MOSFET, correspondingly, the first end of above-mentioned switching device refers to the D utmost point of MOSFET, and the second end refers to the S utmost point of MOSFET.
Above-mentioned the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 can also be the IGBT of diode in belt body not, and correspondingly, the first end of S1 to S4 refers to collector electrode, and the second end refers to emitter.
Above-mentioned the 5th switching device S5 and the 6th switching device S6 can be IGBT, and correspondingly, the first end of the 5th switching device S5, the 6th switching device S6 refers to collector electrode, and the second end refers to emitter.In the situation that the 5th switching device S5 and the 6th switching device S6 are the IGBT of diode in belt body, VD5, VD6 are respectively the interior diode of body that the 5th switching device S5, the 6th switching device S6 carry.
Above-mentioned DC power supply 1 can be a generator, such as solar generator.
As shown in Figure 2, be the another kind of circuit diagram of embodiment of the present invention inverter.
Equally, in this embodiment, inverter 22 comprises: six switching device S1 to S6, diode D1 to D4, VD5, VD6.
But from embodiment illustrated in fig. 1 different be that in this embodiment, the first branch road is different, specific as follows with the connected mode of device in the second branch road:
The series system of the 4th diode D4 and the 6th switching device S6 is: the anode of the 4th diode D4 is connected with the second end of the 6th switching device S6, the negative electrode of the 4th diode D4 is as the first end of the first branch road, and the first end of the 6th switching device S6 is the second end of the first branch road.The series system of the 3rd diode D3 and the 5th switching device S5 is: the anode of the 3rd diode D3 is connected with the second end of the 5th switching device S5, the negative electrode of the 3rd diode is as the first end of the second branch road, and the first end of the 5th switching device is the second end of the second branch road.That is to say, the first end of the first end of the 6th switching device S6 and the 5th switching device S5 is as two outputs of inverter 21.
A work period of above-mentioned inverter illustrated in figures 1 and 2 was comprised of front half period and later half cycle, the corresponding course of work of inverter within a work period is divided into two stages, is respectively the working stage that load voltage is the working stage of timing and load voltage when negative.
In the work period, a kind of drive signal waveform of each switching tube of inverter as shown in Figure 3, wherein, V
acVoltage signal in the expression load.
(T represents a switch periods at phase I 0～T/2, it is the load voltage signal cycle), it is the working stage of timing corresponding to load voltage, the first switching device S1 and the 4th switching device S4 are with synchronous high-frequency pulse signal trigger action, the 5th switching device S5 conducting, second switch device S2, the 3rd switching device S3 and the 6th switching device S6 turn-off.
At second stage T/2～T, working stage when being negative corresponding to load voltage, second switch device S2 and the 3rd switching device S3 be with synchronous high-frequency pulse signal trigger action, the 6th switching device S6 conducting, and the first switching device S1, the 4th switching device S4 and the 5th switching device S5 turn-off.
Above-mentioned high-frequency pulse signal is pwm pulse signal, such as being pulse signal in the KHz scope.
In the work period, the another kind of drive signal waveform of each switching tube of inverter as shown in Figure 4, wherein, V
acVoltage signal in the expression load.
At phase I 0～T/2, it is the working stage of timing corresponding to load voltage, the 4th switching device S4 is with the high-frequency pulse signal trigger action, the first switching device S1 and the 5th switching device S5 conducting, and second switch device S2, the 3rd switching device S3 and the 6th switching device S6 turn-off.
At second stage T/2～T, working stage when being negative corresponding to load voltage, second switch device S2 is with the high-frequency pulse signal trigger action, the 3rd switching device S3 and the 6th switching device S6 conducting, and the first switching device S1, the 4th switching device S4 and the 5th switching device S5 turn-off.
Above-mentioned high-frequency pulse signal is pwm pulse signal, such as being pulse signal in the KHz scope.
The below is take type of drive shown in Figure 3 as example, and the operation principle of embodiment of the present invention inverter shown in Figure 1 is elaborated.
For convenience, the below first defines following parameter:
V
PVBe the output voltage of DC power supply, V
AOBe the voltage that A point and O in figure are ordered, V
BOBe the voltage that B point and O in 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.
At phase I 0～T/2, it is the working stage of timing corresponding to load voltage, the first switching device S1 and the 4th switching device S4 be with synchronous high-frequency pulse signal trigger action, the 5th switching device S5 conducting, and second switch device S2, the 3rd switching device S3 and the 6th switching device S6 turn-off.
When the first switching device S1, the 4th switching device S4 conducting, switching device S2, S3 turn-off, the second diode D2 does not have electric current to flow through, the 6th switching device S6 turn-offs, although the 5th switching device S5 has high level to drive, but because the 5th diode VD5 clamper is born extremely low not conducting of back-pressure, its current circuit is: PV+ → S1 → D1 → L1 → AC load → L2 → S4 → PV-, as shown in Figure 5.
At this moment, V
AO=V
PV, V
BO=0, the common-mode voltage of inverter is:
V
CM＝(V
AO+V
BO)/2＝(V
PV+0)/2＝V
PV/2 (1)
As the first switching device S1, when the 4th switching device S4 turn-offs, the 5th switching device S5 bears forward voltage and conducting, and switching device S2, S3, S6 turn-off at this moment, and its current circuit is: L1 → AC load → L2 → D3 → S5 → D1 → L1, as shown in Figure 6.
At this moment, V
AO=V
PV/ 2, V
BO=V
PV/ 2, the common-mode voltage of inverter is:
V
CM＝(V
AO+V
BO)/2＝(V
PV/2+V
PV/2)/2＝V
PV/2 (2)
As seen, inverter is in the above-mentioned phase I, and common-mode voltage remains unchanged, and is V
PV/ 2.
At second stage T/2～T, working stage when being negative corresponding to load voltage, second switch device S2 and the 3rd switching device S3 be with synchronous high-frequency pulse signal trigger action, the 6th switching device S6 conducting, and the first switching device S1, the 4th switching device S4 and the 5th switching device S5 turn-off.
As second switch device S2, when the 3rd switching device S3 opens, the first switching device S1 and the 4th switching device S4 turn-off, the first diode D1 does not have electric current to flow through, the 5th switching device S5 turn-offs, although the 6th switching device S6 has high level to drive, but because the 6th diode VD6 clamper is born extremely low not conducting of back-pressure, its current circuit is: PV+ → S3 → D2 → L2 → AC load → L1 → S2 → PV-, as shown in Figure 7.
At this moment, V
AO=0, V
BO=V
PV, common-mode voltage is:
V
CM＝(V
AO+V
BO)/2＝(0+V
PV)/2＝V
PV/2； (3)
As second switch device S2, when the 3rd switching device S3 turn-offs, switching device S6 bears forward voltage and conducting, and switching device S1, S4, S5 turn-off at this moment, and its current circuit is: L2 → AC load → L 1 → D4 → S6 → D2 → L2, as shown in Figure 8.
At this moment, V
AO=V
PV/ 2, V
BO=V
PV/ 2, common-mode voltage is:
V
CM＝(V
AO+V
BO)/2＝(V
PV/2+V
PV/2)/2＝V
PV/2 (4)
As seen, inverter is in above-mentioned second stage, and common-mode voltage remains unchanged, and is V
PV/ 2.
Can be found out common-mode voltage V by above-mentioned analysis to the inverter course of work
CMAll the time invariable in the whole course of work, by common-mode voltage V
CMMode ship current i together
CMBetween relation (i
CM=C
CMdV
CM/ dt) as can be known, common mode leakage current i
CMBe always zero, thereby effectively suppressed common mode current, improved the operating efficiency of inverter.
If according to type of drive shown in Figure 4, can obtain above-mentioned conclusion equally, no longer describe in detail at this.
The below continues take modulation system shown in Figure 3 as example, and the operation principle of embodiment of the present invention inverter shown in Figure 2 is elaborated.
At phase I 0～T/2, it is the working stage of timing corresponding to load voltage, the first switching device S1 and the 4th switching device S4 be with synchronous high-frequency pulse signal trigger action, the 5th switching device S5 conducting, and second switch device S2, the 3rd switching device S3 and the 6th switching device S6 turn-off.
When the first switching device S1, the 4th switching device S4 conducting, switching device S2, S3 turn-off, the second diode D2 does not have electric current to flow through, the 6th switching device S6 turn-offs, although the 5th switching device S5 has high level to drive, but because the 5th diode VD5 clamper is born extremely low not conducting of back-pressure, its current circuit is: PV+ → S1 → D1 → L1 → AC load → L2 → S4 → PV-, as shown in Figure 9.
At this moment, V
AO=V
PV, V
BO=0, the common-mode voltage of inverter is:
V
CM＝(V
AO+V
BO)/2＝(V
PV+0)/2＝V
PV/2 (5)
As the first switching device S1, when the 4th switching device S4 turn-offs, the 5th switching device S5 bears forward voltage and conducting, and switching device S2, S3, S6 turn-off at this moment, and its current circuit is: L1 → AC load → L2 → S5 → D3 → D1 → L1, as shown in figure 10.
At this moment, V
AO=V
PV/ 2, V
BO=V
PV/ 2, the common-mode voltage of inverter is:
V
CM＝(V
AO+V
BO)/2＝(V
PV/2+V
PV/2)/2＝V
PV/2 (6)
As seen, inverter is in the above-mentioned phase I, and common-mode voltage remains unchanged, and is V
PV/ 2.
At second stage T/2～T, working stage when being negative corresponding to load voltage, second switch device S2 and the 3rd switching device S3 be with synchronous high-frequency pulse signal trigger action, the 6th switching device S6 conducting, and the first switching device S1, the 4th switching device S4 and the 5th switching device S5 turn-off.
As second switch device S2, when the 3rd switching device S3 opens, the first switching device S1 and the 4th switching device S4 turn-off, the first diode D1 does not have electric current to flow through, the 5th switching device S5 turn-offs, although the 6th switching device S6 has high level to drive, but because the 6th diode VD6 clamper is born extremely low not conducting of back-pressure, its current circuit is: PV+ → S3 → D2 → L2 → AC load → L1 → S2 → PV-, as shown in figure 11.
At this moment, V
AO=0, V
BO=V
PV, common-mode voltage is:
V
CM＝(V
AO+V
BO)/2＝(0+V
PV)/2＝V
PV/2； (7)
As second switch device S2, when the 3rd switching device S3 turn-offs, switching device S6 bears forward voltage and conducting, and switching device S1, S4, S5 turn-off at this moment, and its current circuit is: L2 → AC load → L1 → S6 → D4 → D2 → L2, as shown in figure 12.
At this moment, V
AO=V
PV/ 2, V
BO=V
PV/ 2, common-mode voltage is:
V
CM＝(V
AO+V
BO)/2＝(V
PV/2+V
PV/2)/2＝V
PV/2 (8)
As seen, inverter is in above-mentioned second stage, and common-mode voltage remains unchanged, and is V
PV/ 2.
Can be found out common-mode voltage V by above-mentioned analysis to the inverter course of work
CMAll the time invariable in the whole course of work, by common-mode voltage V
CMMode ship current i together
CMBetween relation (i
CM=C
CMdV
CM/ dt) as can be known, common mode leakage current i
CMBe always zero, thereby effectively suppressed common mode current, improved the operating efficiency of inverter.
Above the embodiment of the present invention is described in detail, has used embodiment herein the present invention is set forth, the explanation of above embodiment just is used for helping to understand equipment of the present invention; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. an inverter, be used for the converting direct-current power into alternating-current power with DC power supply output, it is characterized in that, comprising: six switching devices and six diodes, each switching device have respectively a first end and one second end;
The first switching device, the first diode and second switch device are connected in series successively; The second end of described the first switching device connects the anode of the first diode, and the negative electrode of described the first diode connects the first end of second switch device;
The 3rd switching device, the second diode and the 4th switching device are connected in series successively; The second end of described the 3rd switching device connects the anode of the second diode, and the negative electrode of described the second diode connects the first end of the 4th switching device;
The first end of the first end of the first switching device and the 3rd switching device connects respectively the anode of described DC power supply; The second end of second switch device and the second end of the 4th switching device connect respectively the negative terminal of described DC power supply;
The 4th diode and the series connection of the 6th switching device form the first branch road, the first end of the first branch road connects the second end of the 3rd switching device and the anode of the second diode, and the second end of the first branch road connects the first end of second switch device and the negative electrode of the first diode;
The 3rd diode and the series connection of the 5th switching device form the second branch road, the first end of the second branch road connects the second end of the first switching device and the anode of the first diode, and the second end of the second branch road connects the first end of the 4th switching device and the negative electrode of the second diode;
The 5th switching device is in parallel with the 5th diode reverse, and the 6th switching device is in parallel with the 6th diode reverse;
The second end of described the first branch road and the second end of described the second branch road are two outputs of described inverter;
The second end of the 6th switching device is the first end of the first branch road, and the anode of the 4th diode is the second end of the first branch road; The second end of the 5th switching device is the first end of the first branch road; The anode of the 3rd diode is the second end of the first branch road; The negative electrode that is connected described the 3rd diode with the negative electrode of the 5th diode of described the 5th switching device reverse parallel connection; The negative electrode that is connected the 4th diode with the negative electrode of the 6th diode of described the 6th switching device reverse parallel connection;
Or,
The negative electrode of the 4th diode is the first end of the first branch road, and the first end of the 6th switching device is the second end of the first branch road; The negative electrode of the 3rd diode is the first end of the second branch road, and the first end of the 5th switching device is the second end of the second branch road; With the anode of described the 3rd diode of anodic bonding of the 5th diode of described the 5th switching device reverse parallel connection, with the anode of anodic bonding the 4th diode of the 6th diode of described the 6th switching device reverse parallel connection.
2. inverter according to claim 1, is characterized in that, the front half period within a work period, the 4th switching device is with the high-frequency pulse signal trigger action, the 5th switching device conducting, and second switch device and the 6th switching device turn-off; In the later half cycle within a work period, the second switch device is with the high-frequency pulse signal trigger action, the 6th switching device conducting, and the 4th switching device and the 5th switching device turn-off.
3. inverter according to claim 2 is characterized in that:
The first switching device triggers with the triggering signal of the 4th switching device, and the 3rd switching device triggers with the triggering signal of second switch device; Perhaps
The first switching device triggers with the triggering signal of the 5th switching device, and the 3rd switching device triggers with the triggering signal of the 6th switching device.
4. inverter according to claim 2, is characterized in that, described high-frequency pulse signal is pwm pulse signal.
5. inverter according to claim 2, is characterized in that, described high-frequency pulse signal is the pulse signal in the KHz scope.
6. inverter according to claim 1, is characterized in that, described inverter also comprises:
Energy-storage travelling wave tube is connected to the two ends of described DC power supply.
7. inverter according to claim 6, is characterized in that, described energy-storage travelling wave tube is electric capacity.
8. inverter according to claim 1, it is characterized in that, described inverter also comprises: the first inductance and the second inductance, the first end of the first inductance connects the second end of the first branch road, the first end of the second inductance connects the second end of the second branch road, and the second end of the first inductance and the second end of the second inductance are connected to the two ends of AC load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110240141 CN102291027B (en) | 2011-08-19 | 2011-08-19 | Inverter |
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