CN104767409A - Direct voltage splitting circuit supporting multi-level technology - Google Patents
Direct voltage splitting circuit supporting multi-level technology Download PDFInfo
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- CN104767409A CN104767409A CN201510111524.2A CN201510111524A CN104767409A CN 104767409 A CN104767409 A CN 104767409A CN 201510111524 A CN201510111524 A CN 201510111524A CN 104767409 A CN104767409 A CN 104767409A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a direct voltage splitting circuit supporting the multi-level technology. According to a direct voltage equalizing circuit in the multi-level technology, each of two or more voltage units used for sharing direct voltage is connected with a direct current/alternating current exchanger and a high-frequency transformer, the high-frequency transformers of the different voltage units are the same in structure, primary side connection polarities are the same, and auxiliary side same polarities are connected in parallel. Thus, when load voltages of the different voltage units are different, the different voltage units can transmit energy to the different high-frequency transformers through the direct current/alternating current exchangers respectively, energy transmission is carried out between the different high-frequency transformers, and therefore voltage equalizing of the different voltage units can be achieved. Thus, when the load voltage of the different voltage units deviates, voltage equalizing of the voltage units is guaranteed, and withstand voltage breakdown is prevented.
Description
Technical field
The present invention relates to power electronic technology, particularly a kind of direct voltage bleeder circuit supporting multilevel converter.
Background technology
Mesohigh variable-frequency speed-adjusting energy-saving effect is day by day remarkable, and along with the constantly enhancing of people's energy-saving and emission-reduction consciousness, mesohigh variable-frequency control technique obtains high speed development.In mesohigh converter technique, along with power device withstand voltage level improves constantly, multilevel converter when direct voltage is inputted, is adopted to have very much the potentiality of development.In multilevel converter, direct voltage input unit generally adopts multiple voltage cell to form, and after carrying out the dividing potential drop of DC input voitage, is supplied to different loads respectively and uses.At present, multiple voltage cell can be multiple capacitor cell, be respectively different loads and direct voltage is provided, as shown in Figure 1, the two voltage cell bleeder circuit schematic diagrames that Fig. 1 provides for prior art, at direct voltage input side, access direct voltage 2E after first electric capacity C1 and the second electric capacity C2 connects, i.e. two capacitance voltage E, share direct voltage 2E, first load unit is parallel on the first electric capacity C1, be that the first load unit is for direct voltage E by the first electric capacity C1, second load unit is parallel on the second electric capacity C2, be that the second load unit is for DC power supply E by the second electric capacity C2.Because the first electric capacity C1 and the second electric capacity C2 shares direct voltage 2E jointly, in load running process, when the voltage of two loads is unequal, its electric current is also unequal, as shown in the figure, when supposing that the first electric current I 1 of the first load unit is greater than the second electric current I 2 of the second load unit, the first electric capacity C1 voltage drop, the voltage rise of the second electric capacity C2; When supposing that the first electric current I 1 of the first load unit is less than the second electric current I 2 of the second load unit, the first electric capacity C1 voltage rise, the voltage drop of the second electric capacity C2, this can cause the voltage of two capacitor cells uneven.Therefore, key issue in the direct voltage bleeder circuit of multilevel converter is device withstand voltage, and because load voltage is uneven, the voltage that result in the different voltage cell providing load voltage is uneven, probably the withstand voltage of voltage cell punctures, and affects the reliability service of mesohigh frequency control equipment.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of direct voltage bleeder circuit supporting multilevel converter, when this circuit can work as the load voltage deviation of different voltage cell, ensures all pressures of voltage cell, prevents from being punctured by withstand voltage.
All press between different voltage, thus voltage cell can not be caused breakdown.
According to above-mentioned purpose, the present invention is achieved in that
Support a direct voltage bleeder circuit for multilevel converter, comprising:
At direct voltage input side, access direct voltage after multiple voltage cell series connection, the amplitude of described direct voltage is multiple voltage cell voltage magnitude sums, and each voltage cell load unit in parallel, for described load unit is for the voltage cell voltage of direct current;
In two or more voltage cell, each voltage cell connects a DC/AC inverter and a high frequency transformer, and wherein the high voltage converter structure of different voltage cell is identical, and it is identical that former limit connects polarity, and secondary same polarity is in parallel; The DC/AC inverter of different voltage cell carries out Synchronization Control;
Different voltage cell transfers energy on the high frequency transformer of self respectively by the DC/AC inverter of self, carries out energy transferring between different high frequency transformer.
Described voltage cell is electric capacity.
Described DC/AC inverter is full-bridge direct current/AC converter or Half-bridge DC/AC converter.
Described voltage cell is two voltage cell, and described DC/AC inverter is two full-bridge DC/AC inverter;
Or described voltage cell is three voltage cell, described DC/AC inverter is three full-bridge direct currents/AC converter;
Or described voltage cell is three or four voltage cell, described DC/AC inverter is two full-bridge DC/AC inverter;
Or described voltage cell is two voltage cell, described DC/AC inverter is two half-bridge DC/AC inverter.
Described full-bridge direct current/AC converter is made up of four switching devices, connect rear between two and receive on electric capacity, between two switching devices of series connection, access two, the former limit end points of a high frequency transformer respectively, two end points of the secondary of a high frequency transformer are connected with two end points same polarities of the secondary of another high frequency transformer respectively.
Described Half-bridge DC/AC converter is: be parallel on electric capacity after two capacitances in series, be parallel on electric capacity after two switching device series connection, between the electric capacity of series connection, access an end points on the former limit of a high frequency transformer, between two switching devices of series connection, access another end points on the former limit of a high frequency transformer, two end points of the secondary of a high frequency transformer are connected with two end points same polarities of the secondary of another high frequency transformer respectively.
When voltage cell is three voltage cell, when described DC/AC inverter is two full-bridge DC/AC inverter, do not connect in the voltage cell of a DC/AC inverter and a high frequency transformer, after connecting two-phase rectifier bridge, two-phase rectifier bridge is linked into the same polarity secondary of high frequency transformer.
When voltage cell is four voltage cell, when described DC/AC inverter is two full-bridge DC/AC inverter, after two not being connected the voltage cell series connection of a DC/AC inverter and a high frequency transformer, connect two-phase rectifier bridge again, two-phase rectifier bridge is linked into the same polarity secondary of high frequency transformer;
The former secondary turn ratio of described high frequency transformer is 1:2.
As can be seen from the above scheme, the embodiment of the present invention is in the direct voltage equalizer circuit of multilevel converter, for for sharing in two or more voltage cell of direct voltage, each voltage cell connects a DC/AC inverter and a high frequency transformer, wherein the high voltage converter structure of different voltage cell is identical, it is identical that former limit connects polarity, and secondary same polarity is in parallel.Like this, when the load voltage of different voltage cell is not identical, different voltage cell can transfer energy on different high frequency transformer respectively by DC/AC inverter, carries out energy transferring, thus the voltage of different voltage cell is all pressed between different high frequency transformer.Therefore, when the present invention can work as the load voltage deviation of different voltage cell, ensure all pressures of voltage cell, prevent from being punctured by withstand voltage.
Accompanying drawing explanation
The two voltage cell bleeder circuit schematic diagrames that Fig. 1 provides for prior art;
The direct voltage bleeder circuit structural representation of the support multilevel converter that Fig. 2 provides for the embodiment of the present invention;
The bleeder circuit structural representation of the two voltage cell two full-bridge DC/AC inverter that Fig. 3 provides for the embodiment of the present invention;
The output voltage wave schematic diagram of the circuit structure shown in employing Fig. 3 that Fig. 4 provides for the embodiment of the present invention;
The bleeder circuit structural representation of three voltage cell three full-bridge direct currents/AC converter that Fig. 5 provides for the embodiment of the present invention;
The bleeder circuit structural representation of three voltage cell two full-bridge direct currents/AC converter that Fig. 6 provides for the embodiment of the present invention;
The bleeder circuit structural representation of four voltage cell two full-bridge direct currents/AC converter that Fig. 7 provides for the embodiment of the present invention;
The bleeder circuit structural representation of the two voltage cell two half-bridge DC/AC inverter that Fig. 8 provides for the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, to develop simultaneously embodiment referring to accompanying drawing, the present invention is described in further detail.
As can be seen from background technology, in the direct voltage equalizer circuit of multilevel converter, the withstand voltage reason punctured of voltage cell is likely caused to be because the load voltage of different voltage cell is unbalanced and make the energy of different voltage cell have deviation.Therefore, in order to address this problem, the embodiment of the present invention is in the direct voltage equalizer circuit of multilevel converter, for for sharing in two or more voltage cell of direct voltage, each voltage cell connects a DC/AC inverter and a high frequency transformer, wherein the high voltage converter structure of different voltage cell is identical, and it is identical that former limit connects polarity, and secondary same polarity is in parallel.Like this, when the load voltage of different voltage cell is not identical, different voltage cell can transfer energy on different high frequency transformer respectively by DC/AC inverter, carries out energy transferring, thus the voltage of different voltage cell is all pressed between different high frequency transformer.Therefore, when the present invention can work as the load voltage deviation of different voltage cell, ensure all pressures of voltage cell, prevent from being punctured by withstand voltage.
The direct voltage bleeder circuit structural representation of the support multilevel converter that Fig. 2 provides for the embodiment of the present invention, comprise: at direct voltage input side, direct voltage is accessed after multiple voltage cell series connection, the amplitude of described direct voltage is multiple voltage cell voltage magnitude sums, each voltage cell load unit in parallel, for described load unit is for the voltage cell voltage of direct current;
In two or more voltage cell, each voltage cell connects a DC/AC inverter and a high frequency transformer, and wherein the high voltage converter structure of different voltage cell is identical, and it is identical that former limit connects polarity, and secondary same polarity is in parallel; The DC/AC inverter of different voltage cell carries out Synchronization Control;
Different voltage cell transfers energy on the high frequency transformer of self respectively by the DC/AC inverter of self, carries out energy transferring between different high frequency transformer.
In embodiments of the present invention, voltage cell can be electric capacity.
In embodiments of the present invention, described DC/AC inverter is full-bridge direct current/AC converter or Half-bridge DC/AC converter.
In embodiments of the present invention, described voltage cell is two voltage cell, and described DC/AC inverter is two full-bridge DC/AC inverter; Or described voltage cell is three voltage cell, described DC/AC inverter is three full-bridge direct currents/AC converter; Or when load does not exist energy feedback, described voltage cell is three or four voltage cell, and described DC/AC inverter is two full-bridge DC/AC inverter; Or in low-power applications occasion, described voltage cell is two voltage cell, described DC/AC inverter is two half-bridge DC/AC inverter.
When voltage cell is two voltage cell, when described DC/AC inverter is two full-bridge DC/AC inverter, as shown in Figure 3, the bleeder circuit structural representation of the two voltage cell two full-bridge DC/AC inverter that Fig. 3 provides for the embodiment of the present invention, as shown in the figure:
At direct voltage input side, access direct voltage 2E after first electric capacity C1 and the second electric capacity C2 connects, i.e. two capacitance voltage E, share direct voltage 2E, first load unit is parallel on the first electric capacity C1, by the first electric capacity C1 be the first load unit for direct voltage E, being parallel to by the second load unit on the second electric capacity C2, is that the second load unit is for DC power supply E by the second electric capacity C2;
Wherein, two full-bridge direct current/AC converter Synchronization Control are run, a full-bridge direct current/AC converter is made up of four switching devices, connect rear between two and receive on the first electric capacity C1 or the second electric capacity C2, between two switching devices of series connection, access two, the former limit end points of a high frequency transformer respectively, two end points of the secondary of a high frequency transformer are connected with two end points same polarities of the secondary of another high frequency transformer respectively.
Specifically, first switching device Q1 and second switch device Q2 is incorporated on the first electric capacity C1 after connecting, 3rd switching device Q3 and the 4th switching device Q4 is incorporated on the first electric capacity C1 after connecting, the former limit first end points A1 of the first high frequency transformer T1 is linked between the first switching device Q1 and second switch device Q2, and the second terminal B 1 is linked between the 3rd switching device Q3 and the 4th switching device Q4;
5th switching device Q5 and the 6th switching device Q6 is incorporated on the second electric capacity C2 after connecting, 7th switching device Q7 and the 8th switching device Q8 is incorporated on the second electric capacity C2 after connecting, the former limit first end points A2 of the second high frequency transformer T2 is linked between the 5th switching device Q5 and the 6th switching device Q6, and the second terminal B 2 is linked between the 7th switching device Q7 and the 8th switching device Q8; Two end points of the secondary of the one one high frequency transformer T1 are connected with two end points same polarities of the secondary of the second high frequency transformer T2 respectively.
In figure 3, control requires two full-bridge direct currents/AC converter synchronous operation, namely the first switching device Q1 and Simultaneous Switching identical with the drive singal of the 5th switching device Q5, in like manner second switch device Q2 with the identical and Simultaneous Switching of the drive singal of six switching device Q6,3rd switching device Q3 and Simultaneous Switching identical with the drive singal of the 7th switching device Q7, the 4th switching device Q4 and Simultaneous Switching identical with the drive singal of the 8th switching device Q8.Like this, two full-bridge direct current/AC converter output voltage waveforms are identical, and just voltage magnitude is different.
Adopt the circuit structure of Fig. 3, output waveform as shown in Figure 4, wherein, the output voltage waveforms of the first electric capacity C1 after full-bridge direct current/AC converter is A1B1, the output voltage waveforms of the second electric capacity C2 after full-bridge direct current/AC converter is A2B2, due to two full-bridge direct currents/AC converter synchronous operation, therefore, two waveform positive negative pulse stuffing times are identical, only have pulse amplitude not identical, equal with respective capacitance voltage respectively, two output voltages are isolated through the high frequency transformer that the respective turn ratio is identical, secondary same polarity is connected, like this, just can realize the energy transferring of high voltage unit to low voltage unit.
Suppose that the first electric capacity C1 voltage is greater than the second electric capacity C2 voltage, so the amplitude of output voltage waveforms A1B1 specific output voltage waveform A2B2 is high, then in the first switching device Q1 and the 4th switching device Q4 positive voltage conducting, 5th switching device Q5 and the 8th switching device Q8 conduction period simultaneously, IO1 electric current is just, represent that the first electric capacity C1 exports energy, IO2 electric current is negative, represent that the second electric capacity C2 inputs energy, when the voltage of the first electric capacity C1 and the second electric capacity C2 is equal, except very little transformer magnetizing current, IO1 electric current and IO2 electric current almost nil, first electric capacity C1 and the second electric capacity C2 does not have energy transferring.
The bleeder circuit structural representation of three voltage cell three full-bridge direct currents/AC converter that Fig. 5 provides for the embodiment of the present invention, compared with Fig. 3, multiple 3rd electric capacity C3, the direct voltage 3E of direct voltage input side is connected by the first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity C3 and shares.
Compared with Fig. 3, also add a full-bridge direct current/AC converter and a high frequency transformer, particularly, 9th switching device Q9 and the tenth switching device Q10 is incorporated on the 3rd electric capacity C3 after connecting, 11 switching device Q11 and twelvemo are incorporated on the 3rd electric capacity C3 after closing device Q12 series connection, the former limit first end points A3 of third high frequency power transformer T3 is linked between the 9th switching device Q9 and the tenth switching device Q10, and the second terminal B 3 is linked into the 11 switching device Q11 and twelvemo is closed between device Q12; Two end points of the secondary of third high frequency power transformer T3 are connected with two end points same polarities of the secondary of the second high frequency transformer T2 respectively.
Other circuit structure and the identical of Fig. 3.
If load does not exist energy feedback, then as shown in Figure 6, the bleeder circuit structural representation of three voltage cell two full-bridge direct currents/AC converter that provides for the embodiment of the present invention of Fig. 6.In the figure, owing to there is not load energy feedback, so compared with Fig. 5, full-bridge direct current/the AC converter connect the second electric capacity C2 and high frequency transformer are removed, after second electric capacity C2 connects two-phase rectifier bridge, two-phase rectifier bridge is linked into the same polarity secondary of two high frequency transformer T1 and T2.Particularly, two-phase rectifier bridge is: the first diode D1 and the second diode D2 is parallel on the second electric capacity C2 after connecting, 3rd diode D3 and the 4th diode D4 is parallel on the second electric capacity C2 after connecting, access same polarity secondary first end points of two high frequency transformer T1 and T2 between first diode D1 and the second diode D2, between the 3rd diode D3 and the 4th diode D4, access same polarity secondary second end points of two high frequency transformer T1 and T2.
Second electric capacity C2 can obtain electric energy from the high frequency transformer of the secondary same polarity parallel connection of the first electric capacity C1 and the 3rd electric capacity C3 by two-phase rectifier bridge.This circuit structure realizes all pressures of two voltage cell of the first electric capacity C1 and the 3rd electric capacity C3 on the one hand, makes the voltage of the second electric capacity C2 equal the voltage peak of the first electric capacity C1 and the 3rd electric capacity C3 simultaneously, therefore achieves all pressures object of three voltage cell.
If load does not exist energy feedback, the structure shown in Fig. 7 can also be adopted, the bleeder circuit structural representation of four voltage cell two full-bridge direct currents/AC converter that Fig. 7 provides for the embodiment of the present invention.As shown in the figure, the direct voltage 4E of direct voltage input side is connected by the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3 and the 4th electric capacity C4 and shares, wherein, first electric capacity C1 is connected with full-bridge direct current/AC converter and high frequency transformer, and the 4th electric capacity C4 is connected with full-bridge direct current/AC converter and high frequency transformer.There is not energy feedback in load, and do not have electric current to export between the second electric capacity C2 and the 3rd electric capacity C3, then there is not the voltage-sharing that laod unbalance produces between the second electric capacity C2 and the 3rd electric capacity C3 two voltage cell, then circuit structure simplifies more, after namely the second electric capacity C2 and the 3rd electric capacity C3 being connected, then connect two-phase rectifier bridge electric energy is provided.Particularly, two-phase rectifier bridge is: the 11 diode D11, 12 diode D12, 21 diode D21 and the 22 diode D22 is parallel on the second connected electric capacity C2 and the 3rd electric capacity C3 after connecting, 31 diode D31, 32 diode D32, 41 diode D41 and the 42 diode D42 is parallel on the second connected electric capacity C2 and the 3rd electric capacity C3 after connecting, same polarity secondary first end points of two high frequency transformer T1 and T2 is accessed between 12 diode D12 and the 21 diode D21, same polarity secondary second end points of two high frequency transformer T1 and T2 is accessed between 30 diode D32 and the 41 diode D41.
In the circuit, 11 diode D11 and the 12 diode D12 connects and improves operating voltage, in like manner, the 21 diode D21 and the 22 diode D22 connects, the 31 diode D31 and the 32 diode D32 connects and the 41 diode D41 and the 42 diode D42 connects to improve operating voltage.
In the circuit, in parallel by the secondary same polarity of the first high frequency transformer T1 and the second high frequency transformer T2, for two-phase rectifier bridge is powered; In control, two DC/AC inverter are synchronous, and in order to keep the second electric capacity C2 and the 3rd electric capacity C3 to be respectively voltage E, then the first high frequency transformer T1 and the former secondary turn ratio of the second high frequency transformer T2 are 1:2.
In mesohigh Frequency Drive field, five Level Technology have application prospect widely, five Level Technology adopt four voltage cell structures, for capacitor-clamped five Level Technology, intermediate point electric capacity does not have electric current to export, and for the blower fan water pump of extensive use, there is not energy feedback, therefore, the circuit structure shown in above-mentioned Fig. 7 just can be adopted to carry out DC partial voltage to power.
The bleeder circuit structural representation of the two voltage cell two half-bridge DC/AC inverter that Fig. 8 provides for the embodiment of the present invention, at direct voltage input side, access direct voltage 2E after first electric capacity C1 and the second electric capacity C2 connects, i.e. two capacitance voltage E, share direct voltage 2E, first load unit is parallel on the first electric capacity C1, be that the first load unit is for direct voltage E by the first electric capacity C1, being parallel to by second load unit on the second electric capacity C2, is that the second load unit is for DC power supply E by the second electric capacity C2;
Wherein, two Half-bridge DC/AC converter synchronous operations, a Half-bridge DC/AC converter is: be parallel on the first electric capacity C1 or the second electric capacity C2 after two capacitances in series, be parallel on the first electric capacity C1 or the second electric capacity C2 after two switching device series connection, between the electric capacity of series connection, access an end points on the former limit of a high frequency transformer, between two switching devices of series connection, access another end points on the former limit of a high frequency transformer, two end points of the secondary of a high frequency transformer are connected with two end points same polarities of the secondary of another high frequency transformer respectively.
Specifically, 3rd electric capacity C3 and the 4th electric capacity C4 is incorporated on the first electric capacity C1 after connecting, first switching device Q1 and second switch device Q2 is incorporated on the first electric capacity C1 after connecting, the former limit first end points A1 of the first high frequency transformer T1 is linked between the 3rd electric capacity C3 and the 4th electric capacity C4, and the second terminal B 1 is linked between the first switching device Q1 and second switch device Q2;
5th electric capacity C5 and the 6th electric capacity C6 is incorporated on the second electric capacity C2 after connecting, 3rd switching device Q3 and the 4th switching device Q4 is incorporated on the second electric capacity C2 after connecting, the former limit first end points A2 of the second high frequency transformer T2 is linked between the 5th electric capacity C5 and the 6th electric capacity C6, and the second terminal B 2 is linked between the 3rd switching device Q3 and the 4th switching device Q4; Two end points of the secondary of the one one high frequency transformer T1 are connected with two end points same polarities of the secondary of the second high frequency transformer T2 respectively.
Structure described in Fig. 8 is applicable to low-power applications occasion.
In fig. 8, two Half-bridge DC/AC converter synchronous workings, namely the first switching device Q1 and the 3rd switching device Q3 is all a drive singal and controls Simultaneous Switching, and second switch device Q2 and the 4th switching device Q4 is all a drive singal and controls Simultaneous Switching.This circuit realiration all pressures of the first electric capacity C1 and the second electric capacity C2, ensure that the 3rd electric capacity C3 and the 4th electric capacity C4, the direct voltage of the 5th electric capacity C5 and the 6th electric capacity C6 is all pressed simultaneously.
More than lift preferred embodiment; the object, technical solutions and advantages of the present invention are further described; be understood that; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention; within the spirit and principles in the present invention all, any amendment done, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. support a direct voltage bleeder circuit for multilevel converter, it is characterized in that, comprising:
At direct voltage input side, access direct voltage after multiple voltage cell series connection, the amplitude of described direct voltage is multiple voltage cell voltage magnitude sums, and each voltage cell load unit in parallel, for described load unit is for the voltage cell voltage of direct current;
In two or more voltage cell, each voltage cell connects a DC/AC inverter and a high frequency transformer, and wherein the high voltage converter structure of different voltage cell is identical, and it is identical that former limit connects polarity, and secondary same polarity is in parallel; The DC/AC inverter of different voltage cell carries out Synchronization Control;
Different voltage cell transfers energy on the high frequency transformer of self respectively by the DC/AC inverter of self, carries out energy transferring between different high frequency transformer.
2. circuit as claimed in claim 1, it is characterized in that, described voltage cell is electric capacity.
3. circuit as claimed in claim 1, it is characterized in that, described DC/AC inverter is full-bridge direct current/AC converter or Half-bridge DC/AC converter.
4. circuit as claimed in claim 1, it is characterized in that, described voltage cell is two voltage cell, and described DC/AC inverter is two full-bridge DC/AC inverter;
Or described voltage cell is three voltage cell, described DC/AC inverter is three full-bridge direct currents/AC converter;
Or described voltage cell is three or four voltage cell, described DC/AC inverter is two full-bridge DC/AC inverter;
Or described voltage cell is two voltage cell, described DC/AC inverter is two half-bridge DC/AC inverter.
5. circuit as claimed in claim 4, it is characterized in that, described full-bridge direct current/AC converter is made up of four switching devices, connect rear between two and receive on electric capacity, between two switching devices of series connection, access two, the former limit end points of a high frequency transformer respectively, two end points of the secondary of a high frequency transformer are connected with two end points same polarities of the secondary of another high frequency transformer respectively.
6. circuit as claimed in claim 4, it is characterized in that, described Half-bridge DC/AC converter is: be parallel on electric capacity after two capacitances in series, be parallel on electric capacity after two switching device series connection, between the electric capacity of series connection, access an end points on the former limit of a high frequency transformer, between two switching devices of series connection, access another end points on the former limit of a high frequency transformer, two end points of the secondary of a high frequency transformer are connected with two end points same polarities of the secondary of another high frequency transformer respectively.
7. circuit as claimed in claim 4, it is characterized in that, when voltage cell is three voltage cell, when described DC/AC inverter is two full-bridge DC/AC inverter, do not connect in the voltage cell of a DC/AC inverter and a high frequency transformer, after connecting two-phase rectifier bridge, two-phase rectifier bridge is linked into the same polarity secondary of high frequency transformer.
8. circuit as claimed in claim 4, it is characterized in that, when voltage cell is four voltage cell, when described DC/AC inverter is two full-bridge DC/AC inverter, after two not being connected the voltage cell series connection of a DC/AC inverter and a high frequency transformer, connect two-phase rectifier bridge again, two-phase rectifier bridge is linked into the same polarity secondary of high frequency transformer;
The former secondary turn ratio of described high frequency transformer is 1:2.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111181390A (en) * | 2018-11-13 | 2020-05-19 | 深圳市贝贝特科技实业有限公司 | Circuit equalizer and unmanned aerial vehicle |
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| CN111181390A (en) * | 2018-11-13 | 2020-05-19 | 深圳市贝贝特科技实业有限公司 | Circuit equalizer and unmanned aerial vehicle |
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Application publication date: 20150708 |