CN102255540B - Method, circuit and converter for converting DC voltage into AC voltage - Google Patents
Method, circuit and converter for converting DC voltage into AC voltage Download PDFInfo
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- CN102255540B CN102255540B CN2011101874428A CN201110187442A CN102255540B CN 102255540 B CN102255540 B CN 102255540B CN 2011101874428 A CN2011101874428 A CN 2011101874428A CN 201110187442 A CN201110187442 A CN 201110187442A CN 102255540 B CN102255540 B CN 102255540B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a circuit for converting DC voltage into AC voltage. The circuit comprises a full bridge circuit and an AC free-wheeling circuit. The AC free-wheeling circuit comprises a sixth diode, a seventh diode, an eighth diode, a ninth diode and a fifth switching element, wherein the anode of the sixth diode is connected with the cathode of the seventh diode, and the cathode of the sixth diode is connected with the cathode of the eighth diode; the anode of the ninth diode is connected with the anode of the seventh diode, and the cathode of the ninth diode is connected with the anode of the eighth diode; connection points between the sixth and seventh diodes and between the eighth and ninth diodes are connected with the two ends of an AC load respectively; and the two ends of the fifth switching element are connected with the connection points between the sixth and eighth diodes and between the seventh and ninth diodes respectively. The invention also discloses a converter with the circuit and a voltage conversion method for the circuit. By the circuit, the method and the converter, leakage current is effectively suppressed, and energy conversion efficiency is improved.
Description
Technical field
The utility model belongs to field of power electronics, is specifically related to a kind of method, circuit of converting direct-current voltage into alternating-current voltage and has the converter of this circuit.
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 in the scheme that exchanges end and all adopted transless to be incorporated into the power networks, 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.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 whole system reliability.
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
In view of this, the object of the present invention is to provide a kind of method with converting direct-current voltage into alternating-current voltage, circuit and converter that suppresses the common mode leakage current, improves energy conversion efficiency.
a kind of circuit that dc voltage conversion is become alternating voltage, be used for the converting direct-current voltage into alternating-current voltage of DC power supply output is offered AC load, it comprises full-bridge circuit, described full-bridge circuit comprises with the first switching device, the second switch device, the 3rd switching device and the 4th switching device, described the first switching device and described second switch device form the first series arm, described the 3rd switching device and described the 4th switching device form the second series arm, described the first series arm and described the second series arm are connected in parallel respectively between the positive direct-current bus and negative dc bus of described DC power supply, the tie point of described the first switching device and described second switch device is connected with the first end of AC load, the tie point of described the 3rd switching device and described the 4th switching device is connected with the second end of AC load, this becomes the circuit of alternating voltage also to comprise AC follow current circuit dc voltage conversion, described AC follow current circuit is connected in parallel between the second end of the first end of AC load and AC load, comprise the 6th diode, the 7th diode, the 8th diode, the 9th diode, the 5th switching device, the anode of the 6th diode is connected with the negative electrode of the 7th diode, the anode of the 7th diode is connected with the anode of the 9th diode, the negative electrode of the 9th diode is connected with the anode of the 8th diode, the negative electrode of the 8th diode is connected with the negative electrode of the 6th diode, the 6th diode is connected with the first end of described AC load with the tie point of the 7th diode, the 8th diode is connected with the second end of described AC load with the tie point of the 9th diode, the 6th diode is connected with the first end of the 5th switching device with the tie point of the 8th diode, the 7th diode is connected with the second end of the 5th switching device with the tie point of the 9th diode.
Preferably, described the first switching device, second switch device, the 3rd switching device, the 4th switching device are the power switch pipe with anti-paralleled diode.
Preferably, described the 5th switching device is IGBT.
Preferably, described the 5th switching device is MOSFET.
Preferably, described the first switching device, second switch device, the 3rd switching device, the 4th switching device are the IGBT with anti-paralleled diode.
Preferably, be provided with the first outputting inductance between the tie point of described the 6th diode and described the 7th diode and the first end of AC load, be provided with the second outputting inductance between the tie point of described the 8th diode and described the 9th diode and the second end of AC load.
The first outputting inductance is symmetricly set on the second outputting inductance and exchanges in the output branch road, further suppresses leakage current, reduces the harmonic wave of converter output AC voltage, has improved power factor, has improved the quality of power supply.
the present invention also provides a kind of converter that dc voltage conversion is become alternating voltage, be used for becoming alternating voltage to offer AC load the voltage transitions of DC power supply, comprise the circuit that dc voltage conversion is become alternating voltage, this circuit comprises full-bridge circuit and AC follow current circuit, full-bridge circuit comprises the first switching device, the second switch device, the 3rd switching device and the 4th switching device, described the first switching device and described second switch device form the first series arm, described the 3rd switching device and described the 4th switching device form the second series arm, described the first series arm and described the second series arm are connected in parallel respectively between the positive direct-current bus and negative dc bus of described DC power supply, the tie point of described the first switching device and described second switch device is connected with the first end of AC load, the tie point of described the 3rd switching device and described the 4th switching device is connected with the second end of AC load, AC follow current circuit is connected in parallel between the second end of the first end of AC load and AC load, AC follow current circuit comprises the 6th diode, the 7th diode, the 8th diode, the 9th diode, the 5th switching device, the anode of the 6th diode is connected with the negative electrode of the 7th diode, the anode of the 7th diode is connected with the anode of the 9th diode, the negative electrode of the 9th diode is connected with the anode of the 8th diode, the negative electrode of the 8th diode is connected with the negative electrode of the 6th diode, the 6th diode is connected with the first end of AC load with the tie point of the 7th diode, the 8th diode is connected with the second end of AC load with the tie point of the 9th diode, the 6th diode is connected with the first end of the 5th switching device with the tie point of the 8th diode, the 7th diode is connected with the second end of the 5th switching device with the tie point of the 9th diode.
Preferably, described the first switching device, second switch device, the 3rd switching device, the 4th switching device are the power switch pipe with anti-paralleled diode.
Preferably, described the 5th switching device is IGBT.
Preferably, described the 5th switching device is MOSFET.
Preferably, described the first switching device, second switch device, the 3rd switching device, the 4th switching device are the IGBT with anti-paralleled diode.
Preferably, be provided with the first outputting inductance between the tie point of described the 6th diode and described the 7th diode and the first end of AC load, be provided with the second outputting inductance between the tie point of described the 8th diode and described the 9th diode and the second end of AC load.
The first outputting inductance is symmetricly set on the second outputting inductance and exchanges in the output branch road, further suppresses leakage current, reduces the harmonic wave of converter output AC voltage, has improved power factor, has improved the quality of power supply.
The present invention also provides a kind of and has become the circuit of alternating voltage dc voltage conversion to be become the method for alternating voltage dc voltage conversion for above-mentioned, the method is provided with the first Switching Condition and second switch condition, under described the first Switching Condition, described second switch device and described the 3rd switching device turn-off, described the first switching device and described the 4th switching device be by synchronous high-frequency pulse signal trigger action, described the 5th switching device with the high-frequency pulse signal trigger action of described the first switching device and described the 4th switching device complementation; Under described second switch condition, described the first switching device and described the 4th switching device turn-off, described second switch device and described the 3rd switching device be by synchronous high-frequency pulse signal trigger action, described the 5th switching device with the high-frequency pulse signal trigger action of described second switch device and described the 3rd switching device complementation.
Preferably, described high-frequency pulse signal is the pulse signal in the KHz scope.
Preferably, described high-frequency pulse signal is pulse width modulating signal.
Preferably, under described the first Switching Condition, described the 5th switching device with the process of the high-frequency pulse signal trigger action of described the first switching device and described the 4th switching device complementation in, Dead Time is set; Under described second switch condition, described the 5th switching device with the process of described second switch device and described the 3rd switching device high-frequency pulse signal trigger action in, Dead Time is set.
Beneficial effect of the present invention is: in the whole course of work, common-mode voltage keeps invariable, thereby has avoided the generation of switching frequency common-mode voltage, and then has suppressed leakage current; And avoided the use of leakage current absorption plant, reduced system cost, improved energy conversion efficiency.
Further, by Dead Time is set, avoid causing bridge arm direct pass due to the turn-off delay effect of switching device, and then cause switching device to damage, make the switching device reliable operation, improved the reliability of circuit working.
Description of drawings
Fig. 1 is the circuit diagram of the disclosed converter of the embodiment of the present invention;
Fig. 2 is circuit working shown in Figure 1 the first switching device and the 4th switching device conducting under the first Switching Condition, the current direction schematic diagram when the 5th switching device turn-offs;
Fig. 3 is the current direction schematic diagram of circuit working shown in Figure 1 during Dead Time under the first Switching Condition;
Fig. 4 is that circuit working shown in Figure 1 the first switching device and the 4th switching device under the first Switching Condition turn-off, the current direction schematic diagram during the 5th switching device conducting;
Fig. 5 is circuit working shown in Figure 1 second switch device and the 3rd switching device conducting under the second switch condition, the current direction schematic diagram when the 5th switching device turn-offs;
Fig. 6 is the current direction schematic diagram of circuit working shown in Figure 1 during Dead Time under the second switch condition;
Fig. 7 is that circuit working shown in Figure 1 second switch device and the 3rd switching device under the second switch condition turn-off, the current direction schematic diagram during the 5th switching device conducting;
Fig. 8 is the drive waveforms of the first switching device to the five switching devices of circuit ac output voltage waveform shown in Figure 1 and correspondence.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The object of the present invention is to provide a kind of method with converting direct-current voltage into alternating-current voltage, circuit and converter that suppresses leakage current, improves energy conversion efficiency.
With reference to Fig. 1, be the circuit diagram of the disclosed converter of the embodiment of the present invention.Described converter is used for the converting direct-current voltage into alternating-current voltage of DC power supply 1 output is offered AC load, comprise storage capacitor C, dc voltage conversion become the circuit of alternating voltage, describedly become the circuit of alternating voltage to comprise full-bridge circuit 2 and AC follow current circuit 3 dc voltage conversion.
above-mentioned full-bridge circuit 2 comprises the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4, the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 inverse parallel respectively are connected with the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, described the first switching device S1 and described second switch device S2 form the first series arm, described the 3rd switching device S3 and described the 4th switching device S4 form the second series arm, described the first series arm and described the second series arm are connected between the positive direct-current bus and negative dc bus of described DC power supply, the tie point A of described the first switching device S1 and described second switch device S2 is connected with the first end of AC load, the tie point B of described the 3rd switching device S3 and described the 4th switching device S4 is connected with the second end of AC load.
Need to prove, above-mentioned the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 symmetrical configuration, select the switching device of same model, be the power switch pipe that carries anti-paralleled diode.Concrete, the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 can be the IGBT that carries anti-paralleled diode.
above-mentioned AC follow current circuit 3 comprises the 6th diode D6, the 7th diode D7, the 8th diode D8, the 9th diode D9, the 5th switching device S5, the anode of the 6th diode D6 is connected with the negative electrode of the 7th diode D7, the anode of the 7th diode D7 is connected with the anode of the 9th diode D9, the negative electrode of the 9th diode D9 is connected with the anode of the 8th diode D8, the negative electrode of the 8th diode D8 is connected with the negative electrode of the 6th diode D6, the 6th diode D6 is connected with the first end of AC load with the tie point A of the 7th diode D7, the 8th diode D8 is connected with the second end of AC load with the tie point B of the 9th diode D9, the 6th diode D6 is connected with the first end of the 5th switching device S5 with the tie point of the 8th diode D8, the 7th diode D7 is connected with the second end of the 5th switching device S5 with the tie point of the 9th diode D9.
Wherein, above-mentioned the 5th switching device S5 can be IGBT or MOSFET.
Above-mentioned the 6th diode D6, the 7th diode D7, the 8th diode D8, the 9th diode D9 symmetrical configuration, model are identical.
Preferably, between the first end of the tie point A of described the first switching device S1 and described second switch device S2 and AC load, be provided with the first outputting inductance L1; Between the second end of the tie point B of described the 3rd switching device S3 and described the 4th switching device S4 and AC load, be provided with the second outputting inductance L2.
The first outputting inductance L1 is symmetricly set on the second outputting inductance L2 and exchanges in the output branch road, further suppresses leakage current, reduces the harmonic wave of converter output AC voltage, has improved power factor, has improved the quality of power supply.
Need to prove, in the embodiment of the present invention, AC load can be both to exchange the power consumption load, can be also AC network.That is, the converter in the embodiment of the present invention both can work in the pattern of being incorporated into the power networks, and also can work in independent operation mode.
The embodiment of the present invention also provides a kind of circuit for dc voltage conversion being become alternating voltage dc voltage conversion to be become the method for alternating voltage, the method is provided with the first Switching Condition and second switch condition, under the first Switching Condition, second switch device S2 and the 3rd switching device S3 turn-off, the first switching device S1 and the 4th switching device S4 be by synchronous high-frequency pulse signal trigger action, the 5th switching device S5 with the high-frequency pulse signal trigger action of the first switching device S1 and the 4th switching device S4 complementation; Under the second switch condition, the first switching device S1 and the 4th switching device S4 turn-off, second switch device S2 and the 3rd switching device S3 be by synchronous high-frequency pulse signal trigger action, the 5th switching device S5 with the high-frequency pulse signal trigger action of second switch device S2 and the 3rd switching device S3 complementation.
Particularly, high-frequency pulse signal is pulse signal or the pulse width modulating signal in the KHz scope.
Further, under the first Switching Condition, the 5th switching device S5 with the process of the high-frequency pulse signal trigger action of the first switching device S1 and the 4th switching device S4 complementation in, Dead Time is set; Under the second switch condition, the 5th switching device S5 with the process of the high-frequency pulse signal trigger action of second switch device S2 and the 3rd switching device S3 complementation in, Dead Time is set.
By the setting of Dead Time, avoid causing bridge arm direct pass due to the turn-off delay effect of switching device, and then cause switching device to damage, make the switching device reliable operation, improved the reliability of circuit working.Be distortion and the reduction delivery efficiency of avoiding output waveform, Dead Time is generally μ s level.
Fig. 8 is the drive waveforms of the first switching device S1 to the five switching device S5 of circuit ac output voltage waveform shown in Figure 1 and correspondence.
Please in conjunction with Fig. 8, can find out, above-mentioned the first Switching Condition is corresponding to the positive half cycle of ac output voltage, and the second switch condition is corresponding to the negative half period of ac output voltage.
Under request in person in conjunction with Fig. 2 to Fig. 7, the concrete analysis circuit shown in Figure 1 the course of work.
Fig. 2 be circuit working shown in Figure 1 under the first Switching Condition, the first switching device S1 and the 4th switching device S4 conducting, the current direction schematic diagram when the 5th switching device S5 turn-offs.
Please in conjunction with Fig. 2, electric current flow through the first switching device S1, the first outputting inductance L1, the second outputting inductance L2, the 4th switching device S4 of full-bridge circuit 2, DC power supply 1 is powered to AC load by full-bridge circuit 2.
Fig. 3 be circuit working shown in Figure 1 under the first Switching Condition, the current direction schematic diagram during Dead Time.
Please in conjunction with Fig. 3, electric current flow through the second diode D2, the first outputting inductance L1, the second outputting inductance L2, the 3rd diode D3 of full-bridge circuit 2, wherein the first outputting inductance L1, the second outputting inductance L2 afterflow powered to AC load on the one hand, on the other hand, give storage capacitor C charging.
Fig. 4 be circuit working shown in Figure 1 under the first Switching Condition, the first switching device S1 and the 4th switching device S4 turn-off, the current direction schematic diagram during the 5th switching device S5 conducting.
Please in conjunction with Fig. 4, electric current flow through the 7th diode D7, the 8th diode D8, the first outputting inductance L1, the second outputting inductance L2, the 5th switching device S5 of AC follow current circuit 3, wherein the first outputting inductance L1, the second outputting inductance L2 afterflow, power to AC load.
Fig. 5 be circuit working shown in Figure 1 under the second switch condition, second switch device S2 and the 3rd switching device S3 conducting, the current direction schematic diagram when the 5th switching device S5 turn-offs.
Please in conjunction with Fig. 5, electric current flow through the 3rd switching device S3, the first outputting inductance L1, the second outputting inductance L2, the second switch device S2 of full-bridge circuit 2, DC power supply 1 is powered to AC load by full-bridge circuit 2.
Fig. 6 be circuit working shown in Figure 1 under the second switch condition, the current direction schematic diagram during Dead Time.
Please in conjunction with Fig. 6, electric current flow through the first diode D1, the first outputting inductance L1, the second outputting inductance L2, the 4th diode D4 of full-bridge circuit 2, wherein the first outputting inductance L1, the second outputting inductance L2 afterflow powered to AC load on the one hand, on the other hand, give storage capacitor C charging.
Fig. 7 be circuit working shown in Figure 1 under the second switch condition, second switch device S2 and the 3rd switching device S3 turn-off, the current direction schematic diagram during the 5th switching device S5 conducting.
Please in conjunction with Fig. 7, electric current flow through the 6th diode D6, the 9th diode D9, the first outputting inductance L1, the second outputting inductance L2, the 5th switching device S5 of AC follow current circuit 3, wherein the first outputting inductance L1, the second outputting inductance L2 afterflow, power to AC load.
Again need to prove, the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 can be both the anti-paralleled diodes that the first switching device S1, second switch device S2, the 3rd switching device S3 and the 4th switching device S4 carry, and can be also diodes independently.
How the below's concrete analysis suppresses the common mode leakage current in the above-mentioned course of work, improve conversion efficiency.
Please again in conjunction with Fig. 1, define V
DCBe the output voltage of DC power supply 1, V
AOBe the voltage that A point and O are ordered, V
BOBe the voltage that B point and O are ordered, V
cmBe common-mode voltage, i
cmBe common mode leakage current, C
cmBe DC power supply the appearance value of parasitic capacitance, i.e. common mode capacitance appearance value over the ground.
According to the definition of common-mode voltage as can be known, V
cm=(V
AO+ V
BO)/2.
First make a concrete analysis of in conjunction with the course of work under the first Switching Condition:
(1) in the first switching device S1, the 4th switching device S4 conduction period, please in conjunction with Fig. 2, V
AO=V
DC, V
BO=0, can learn common-mode voltage V
cm=V
DC/ 2;
(2) during Dead Time, please in conjunction with Fig. 4, V
AO=0, V
BO=V
DC, can learn common-mode voltage V
cm=V
DC/ 2;
(3) turn-off at the first switching device S1, the 4th switching device S4, during the 5th switching device S5 opens, please in conjunction with Fig. 3, because the first switching device S1, the 4th switching device S4 symmetrical configuration, model are identical, so, V
AO=V
DC/ 2, V
BO=V
DC/ 2, can learn common-mode voltage V
cm=V
DC/ 2.
By above-mentioned derivation as can be known: common-mode voltage V
cmInvariable all the time in the course of work under the first Switching Condition, 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 zero.
In like manner, can derive job analysis under the second switch condition.
In sum, common-mode voltage V
cmBe invariable all the time in the whole course of work at the first Switching Condition and second switch condition, the common mode leakage current is zero, thereby, avoided the use of leakage current absorption plant, reduce system cost, improved energy conversion efficiency.
Obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Claims (10)
1. circuit that dc voltage conversion is become alternating voltage, be used for the converting direct-current voltage into alternating-current voltage of DC power supply output is offered AC load, it comprises full-bridge circuit, described full-bridge circuit comprises with the first switching device, the second switch device, the 3rd switching device and the 4th switching device, described the first switching device and described second switch device form the first series arm, described the 3rd switching device and described the 4th switching device form the second series arm, described the first series arm and described the second series arm are connected in parallel respectively between the positive direct-current bus and negative dc bus of described DC power supply, the tie point of described the first switching device and described second switch device is connected with the first end of AC load, the tie point of described the 3rd switching device and described the 4th switching device is connected with the second end of AC load, it is characterized in that: this becomes the circuit of alternating voltage also to comprise AC follow current circuit dc voltage conversion, described AC follow current circuit is connected in parallel between the second end of the first end of described AC load and described AC load, comprise the 6th diode, the 7th diode, the 8th diode, the 9th diode, the 5th switching device, the anode of the 6th diode is connected with the negative electrode of the 7th diode, the anode of the 7th diode is connected with the anode of the 9th diode, the negative electrode of the 9th diode is connected with the anode of the 8th diode, the negative electrode of the 8th diode is connected with the negative electrode of the 6th diode, the 6th diode is connected with the first end of described AC load with the tie point of the 7th diode, the 8th diode is connected with the second end of described AC load with the tie point of the 9th diode, the 6th diode is connected with the first end of the 5th switching device with the tie point of the 8th diode, the 7th diode is connected with the second end of the 5th switching device with the tie point of the 9th diode.
2. circuit according to claim 1, it is characterized in that: described the first switching device, second switch device, the 3rd switching device, the 4th switching device are the power switch pipe with anti-paralleled diode.
3. circuit according to claim 1, it is characterized in that: described the 5th switching device is IGBT or MOSFET.
4. circuit according to claim 2, it is characterized in that: described the first switching device, second switch device, the 3rd switching device, the 4th switching device are the IGBT with anti-paralleled diode.
5. circuit according to claim 1, it is characterized in that: be provided with the first outputting inductance between the tie point of described the 6th diode and described the 7th diode and the first end of AC load, be provided with the second outputting inductance between the tie point of described the 8th diode and described the 9th diode and the second end of AC load.
6. a converter that dc voltage conversion is become alternating voltage, is characterized in that: comprise the described circuit that dc voltage conversion is become alternating voltage of any one in claim 1 to 5.
One kind be used for the described circuit of claim 1 to 5 any one dc voltage conversion is become the method for alternating voltage, it is characterized in that: be provided with the first Switching Condition and second switch condition, under described the first Switching Condition, described second switch device and described the 3rd switching device turn-off, described the first switching device and described the 4th switching device be by synchronous high-frequency pulse signal trigger action, described the 5th switching device with the high-frequency pulse signal trigger action of described the first switching device and described the 4th switching device complementation; Under described second switch condition, described the first switching device and described the 4th switching device turn-off, described second switch device and described the 3rd switching device be by synchronous high-frequency pulse signal trigger action, described the 5th switching device with the high-frequency pulse signal trigger action of described second switch device and described the 3rd switching device complementation.
8. method according to claim 7 is characterized in that: described high-frequency pulse signal is the pulse signal in the KHz scope.
9. method according to claim 7, it is characterized in that: described high-frequency pulse signal is pulse width modulating signal.
10. method according to claim 7, it is characterized in that: under described the first Switching Condition, described the 5th switching device with the process of the high-frequency pulse signal trigger action of described the first switching device and described the 4th switching device complementation in, Dead Time is set; Under described second switch condition, described the 5th switching device with the process of the high-frequency pulse signal trigger action of described second switch device and described the 3rd switching device complementation in, Dead Time is set.
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| CN103904994B (en) * | 2014-03-28 | 2016-06-22 | 华为技术有限公司 | The detection method of a kind of leakage current and device |
| CN109361322A (en) * | 2018-11-02 | 2019-02-19 | 湖南大学 | Non-isolation type five-electrical level inverter and its leakage current resist strategy |
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|---|---|---|---|---|
| CN201323532Y (en) * | 2008-12-03 | 2009-10-07 | 天津华云自控股份有限公司 | Mid-position clamp circuit of three-level voltage source type frequency converter |
| CN102088193A (en) * | 2011-03-04 | 2011-06-08 | 东南大学 | Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof |
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| CN102255540A (en) | 2011-11-23 |
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