CN104539160A - Ultralow-output-voltage-ripple diode-clamped seven-level direct-current converter and direct-current power supply - Google Patents

Ultralow-output-voltage-ripple diode-clamped seven-level direct-current converter and direct-current power supply Download PDF

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Publication number
CN104539160A
CN104539160A CN201410714309.7A CN201410714309A CN104539160A CN 104539160 A CN104539160 A CN 104539160A CN 201410714309 A CN201410714309 A CN 201410714309A CN 104539160 A CN104539160 A CN 104539160A
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voltage
diode
circuit
power supply
emitter
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CN201410714309.7A
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CN104539160B (en
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石勇
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BEIJING LANJUN ELECTRICAL EQUIPMENT Co.,Ltd.
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XI'AN ACTIONPOWER ELECTRICAL CO Ltd
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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
    • 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
    • H02M1/14—Arrangements for reducing ripples from dc input or output

Abstract

The invention relates to an ultralow-output-voltage-ripple diode-clamped seven-level direct-current converter and a direct-current power supply. The converter is composed of two input capacitors Cin1 and Cin2, eight self-turn-off devices S1-S8, a blocking capacitor CBL, a flying capacitor Css, three transformers T1, T2 and T3, and an output rectifier and filter unit. The improvement lies in the following three aspects: (1) three levels are input, and all switching devices at the primary sides of the transformers only can withstand Uin/2 voltage stress; (2) the output voltage harmonic is very low, the size of an output filter is effectively reduced, and the system dynamic is improved; and (3) in the normal working state, the input current is continuous, and the input current ripple is small. The circuit can be widely used in the field of direct-current power supplies with high input voltage and requiring high dynamic, such as a high-voltage magnet accelerator power supply.

Description

Pole low output voltage ripple diode clamp seven level DC converter and DC power supply
Technical field
The present invention relates to a kind of many level DC converter topologys, this circuit can be used for direct-current switch power supply field.
Background technology
Multilevel converter is the hot technology of power electronic technology.In applied power electronics, be subject to the impact of device voltage quota, the inevitable version adopting devices in series in circuit, in order to static state, the dynamic voltage balancing problem solving devices in series must add equalizer circuit.Along with adding and the increase of number of devices of equalizer circuit, circuit possesses multiple-working mode and multiple output level naturally, obtains better output characteristic by the combination of mode of operation.
1992, Brazilian scholar proposed a kind of diode clamp three-level DC converter, and this circuit as shown in Figure 1.In Fig. 1 circuit, 4 self-turn-off devices are connected in series, by dc-link capacitance C in1, C in2with clamp diode D cl1, D cl2the voltage stress of balanced self-turn-off device, thus make the voltage stress of each self-turn-off device be the half of input voltage, this circuit can be widely used in high voltage direct current conversion field.But this circuit has a weak point, namely before output filter voltage at U in/ 2k tand saltus step between 0, output harmonic wave content is large, causes output filter volume large, affects the power density of device entirety.Meanwhile, when level before output filter is 0, input current is interrupted, causes larger input current ripple, thus needs larger input electromagnetic interface filter to suppress input current ripple.
Summary of the invention
In order to solve the problem, the present invention proposes a kind of pole low output voltage ripple diode clamp seven level DC converter, can effectively reduce the volume of input, output filter.
To achieve these goals, the present invention adopts following technical scheme:
The many level DC converters of pole low output voltage ripple diode clamp, comprise three level asymmetrical half-bridge DC converter, and described three level asymmetrical half-bridge DC converter comprises self-turn-off device group, equalizer circuit, high frequency transformer T 1and output rectification filter unit,
Described self-turn-off device group comprises self-turn-off device S 1, S 2, S 3, S 4, S 1, S 2, S 3, S 4between connected successively with the connection of collector electrode by emitter, wherein S 1collector electrode be connected with the anode of DC power supply, S 4emitter be connected with the negative terminal of DC power supply, each self-turn-off device is inverse parallel diode also;
Described equalizer circuit comprises two electric capacity C of the series connection be connected between DC power supply positive and negative terminal in1and C in2; Also comprise and be connected to S 1emitter and S 3two between the emitter clamp diode D be in series cl1with D cl2, wherein D cl1anode and S 3emitter connects, D cl2negative terminal and S 1emitter connects, D cl1with D cl2tie point and C in1and C in2tie point be communicated with; Also comprise and be connected to S 1emitter and S 3floating capacitance C between emitter aa;
Described high frequency transformer T 1the Same Name of Ends of former limit winding by capacitance C bLwith S 1emitter connects, described high frequency transformer T 1the different name end of former limit winding be connected with DC power supply negative terminal, described high frequency transformer T 1vice-side winding export direct current by rectification filtering unit,
Its special character is:
Described many level DC converters also comprise four self-turn-off device S 5, S 6, S 7, S 8, two transformer T 2and T 3, every self-turn-off device also inverse parallel diode,
Self-turn-off device S 5, S 6, S 7, S 8, S 2, S 3form three-phase inversion half-bridge circuit, S 5, S 6be two brachium pontis of a single-phase inversion half-bridge circuit, S 7, S 8be two brachium pontis of a single-phase inversion half-bridge circuit, S 2, S 3be two brachium pontis of a single-phase inversion half-bridge circuit,
Described T 2and T 3former limit winding different name end all and S 7, S 8tie point connect, described T 2the Same Name of Ends of former limit winding and S 2, S 3tie point connect, described T 3the Same Name of Ends of former limit winding and S 7, S 8tie point connect,
Described T 2and T 3vice-side winding and T 1vice-side winding be in series and export direct current by rectification filtering unit.
Above-mentioned rectification filtering unit comprises diode full bridge rectifier and LC filter circuit, described T 2and T 3vice-side winding and T 1vice-side winding be in series after successively by diode full bridge rectifier and the whole output direct current of LC filter circuit.
A kind of DC power supply, its special character is: comprise three-phase alternating-current supply, diode rectifier circuit, DC converter, and described three-phase alternating-current supply is connected with DC converter by diode rectifier circuit, and the structure of described DC converter is described above.
Above-mentioned diode rectifier circuit is three-phase bridge diode uncontrollable rectifier unit.
Compared with prior art, beneficial effect is in the present invention:
1, the present invention is by the combination of different switching mode, obtains U at transformer secondary in/ 2k t, U in/ 3k t, U in/ 6k t, 0 ,-U in/ 2k t,-U in/ 3k t,-U in/ 6k tdeng 7 level, therefore the present invention is that 7 level export many level DC converters viewed from output waveform, and can reduce the voltage harmonic content before output filter greatly, therefore the volume of output filter can reduce greatly, improves system dynamic;
2, when circuit of the present invention normally works, not containing 0 level before output filter, input current is continuous all the time.Therefore, the input electromagnetic interface filter needed for circuit involved in the present invention is also far smaller than the circuit shown in Fig. 1.This circuit can be widely used in high input voltage and to the higher DC power supply field of dynamic requirements, such as high pressure magnet accelerator driven sub-critical system.
3, DC converter topological structure of the present invention is simple, and device used is few.
Accompanying drawing explanation
Fig. 1 Brazil scholar proposes diode clamp tri-level circuit.
The circuit topology that Fig. 2 the present invention proposes.
Fig. 3 the present invention proposes the output filter successively voltage signal of circuit topology.
Fig. 4 is that in embodiment, transformer secondary is operated in 3U in/ 2k tconducting schematic diagram under pattern.
Fig. 5 is that in embodiment, transformer secondary is operated in U in/ k tconducting schematic diagram under pattern.
Fig. 6 is that in embodiment, transformer secondary is operated in U in/ 2k tconducting schematic diagram under pattern.
Fig. 7 is that in embodiment, transformer secondary is operated in conducting schematic diagram under 0 pattern.
Fig. 8 is that in embodiment, transformer secondary is operated in-3U in/ 2k tconducting schematic diagram under pattern.
Fig. 9 is that in embodiment, transformer secondary is operated in-U in/ k tconducting schematic diagram under pattern.
Figure 10 is that in embodiment, transformer secondary is operated in-U in/ 2k tconducting schematic diagram under pattern.
Figure 11 is that in embodiment, transformer secondary is operated in conducting schematic diagram under 0 pattern.
Figure 12 is the circuit structure diagram of embodiment 1.
Embodiment
Structure of the present invention and operation principle is described in detail below according to embodiment.
This example is the Switching Power Supply main circuit topology adopting pole low output voltage ripple diode clamp three-level DC converter:
Its transformer primary side circuit feature is: direct current input positive pole and S 1collector electrode and C in1one end be connected to 1; C in1the other end and C in2one end, D cl1anode and D cl2negative electrode be connected to 2; Direct current input negative pole and C in2the other end, S 4emitter and transformer T 1former limit winding T 1pnon-same polarity be connected to 3; S 1emitter and S 2collector electrode, S 5collector electrode, S 7collector electrode, C ssone end and D cl1negative electrode be connected to 4; S 7emitter and S 8collector electrode and transformer T 3former limit winding T 3psame Name of Ends be connected to 5; S 8emitter and S 6emitter, S 3current collection emitter, S 4collector electrode, C ssthe other end and D cl2anode be connected to 6; S 5emitter and S 6collector electrode, transformer T 3former limit winding T 3pnon-same polarity and transformer T 2former limit winding T 2pnon-same polarity be connected to 7; S 2emitter and S 3collector electrode, transformer T 2former limit winding T 2psame Name of Ends and C bLone end be connected to 8; C bLthe other end and transformer T 1former limit winding T 1psame Name of Ends be connected to 9.
Transformer secondary circuit feature is:
D o1and D o2negative electrode and L oone end be connected to 10; L oone end and C oone end be connected to 11; T 1vice-side winding T 1ssame Name of Ends and D o1anode and D o2negative electrode connect with 12; T 1vice-side winding T 1snon-same polarity and T 2vice-side winding T 2ssame Name of Ends be connected to 13; T 2vice-side winding T 2snon-same polarity and T 3vice-side winding T 3ssame Name of Ends be connected to 14; T 3vice-side winding T 3snon-same polarity and D o3anode and D o4negative electrode be connected to 15; D o2and D o4anode and C outthe other end be connected to 16.
By the combination of different switching mode, obtain U at transformer secondary in/ 2k t, U in/ 3k t, U in/ 6k t, 0 ,-U in/ 2k t,-U in/ 3k t,-U in/ 6k tdeng 7 level, therefore the present invention is that 7 level export many level DC converters viewed from output waveform, can reduce the voltage harmonic content before output filter greatly.After Figure 3 shows that different mode combination, output filter voltage waveform and filtered voltage waveform view.Can find out in figure, the closely output voltage waveforms of the voltage waveform before filter, therefore the volume of output filter can reduce greatly.State shown in Fig. 3 (c) is soft of circuit and current limliting operating state, the normal operating conditions that Fig. 3 (a) and Fig. 3 (b) is circuit.From Fig. 3 (a) and Fig. 3 (b), when circuit normally works, not containing 0 level before output filter, input current is continuous all the time.Therefore, the input electromagnetic interface filter needed for circuit involved in the present invention is also far smaller than circuit shown in Fig. 1.
See Figure 12, three-phase alternating-current supply is through diode rectifier circuit D in1-D in6become direct current, DC side positive pole is through inductance L inbe connected with 1 end of described circuit; The negative pole of DC side is connected with 3 ends of described circuit.C during circuit working bLboth end voltage is controlled is made as U in/ 2, its prevailing operating state is summarized as follows:
See Fig. 4, switch S 1, S 2, S 7, S 6conducting.Transformer T 1former limit winding T 1pthe voltage that two ends are born is U in/ 2, transformer T 2former limit winding T 2pthe voltage that two ends are born is U in/ 2, transformer T 3former limit winding T 3pthe voltage that two ends are born is U in/ 2.Transformer secondary winding is connected in series, itself and be 3U in/ 2k tlevel.
See Fig. 5, switch S 2, S 7, S 6, D 4conducting.Transformer T 1former limit winding T 1pthe voltage that two ends are born is 0, transformer T 2former limit winding T 2pthe voltage that two ends are born is U in/ 2, transformer T 3former limit winding T 3pthe voltage that two ends are born is U in/ 2.Transformer secondary winding is connected in series, itself and be U in/ k tlevel.
See Fig. 6, switch S 2, S 6, D 4, D 8conducting.Transformer T 1former limit winding T 1pthe voltage that two ends are born is 0, transformer T 2former limit winding T 2pthe voltage that two ends are born is 0, transformer T 3former limit winding T 3pthe voltage that two ends are born is U in/ 2.Transformer secondary winding is connected in series, itself and be U in/ 2k tlevel.
See Fig. 7, switch S 2, D 5, D 4, D 8conducting.Transformer T 1former limit winding T 1pthe voltage that two ends are born is 0, transformer T 2former limit winding T 2pthe voltage that two ends are born is 0, transformer T 3former limit winding T 3pthe voltage that two ends are born is 0.Transformer secondary winding is connected in series, itself and be 0 level.
See Fig. 8, switch S 3, S 4, S 5, S 8conducting.Transformer T 1former limit winding T 1pthe voltage that two ends are born is-U in/ 2, transformer T 2former limit winding T 2pthe voltage that two ends are born is-U in/ 2, transformer T 3former limit winding T 3pthe voltage that two ends are born is-U in/ 2.Transformer secondary winding is connected in series, itself and be-3U in/ 2k tlevel.
See Fig. 9, switch S 3, S 5, S 8, D 1conducting.Transformer T 1former limit winding T 1pthe voltage that two ends are born is 0, transformer T 2former limit winding T 2pthe voltage that two ends are born is-U in/ 2, transformer T 3former limit winding T 3pthe voltage that two ends are born is-U in/ 2.Transformer secondary winding is connected in series, itself and be-U in/ k tlevel.
See Figure 10, switch S 3, S 5, D 7, D 1conducting.Transformer T 1former limit winding T 1pthe voltage that two ends are born is 0, transformer T 2former limit winding T 2pthe voltage that two ends are born is 0, transformer T 3former limit winding T 3pthe voltage that two ends are born is-U in/ 2.Transformer secondary winding is connected in series, itself and be-U in/ 2k tlevel.
See Figure 11, switch S 3, D 1, D 6, D 7conducting.Transformer T 1former limit winding T 1pthe voltage that two ends are born is 0, transformer T 2former limit winding T 2pthe voltage that two ends are born is 0, transformer T 3former limit winding T 3pthe voltage that two ends are born is 0.Transformer secondary winding is connected in series, itself and be 0 level.
When the circuit is operating, according to different output voltages, adopt different mode combination, such as, when output voltage is at 3U in/ 2k tand U in/ k tbetween when changing, circuit working is between Fig. 4, Fig. 5, Fig. 8 and Fig. 9.
See Fig. 3, for this circuit different mode combination under output filter before and after voltage waveform.

Claims (4)

1. the many level DC converters of pole low output voltage ripple diode clamp, comprise three level asymmetrical half-bridge DC converter, and described three level asymmetrical half-bridge DC converter comprises self-turn-off device group, equalizer circuit, high frequency transformer T 1and output rectification filter unit,
Described self-turn-off device group comprises self-turn-off device S 1, S 2, S 3, S 4, S 1, S 2, S 3, S 4between connected successively with the connection of collector electrode by emitter, wherein S 1collector electrode be connected with the anode of DC power supply, S 4emitter be connected with the negative terminal of DC power supply, each self-turn-off device is inverse parallel diode also;
Described equalizer circuit comprises two electric capacity C of the series connection be connected between DC power supply positive and negative terminal in1and C in2; Also comprise and be connected to S 1emitter and S 3two between the emitter clamp diode D be in series cl1with D cl2, wherein D cl1anode and S 3emitter connects, D cl2negative terminal and S 1emitter connects, D cl1with D cl2tie point and C in1and C in2tie point be communicated with; Also comprise and be connected to S 1emitter and S 3floating capacitance C between emitter aa;
Described high frequency transformer T 1the Same Name of Ends of former limit winding by capacitance C bLwith S 1emitter connects, described high frequency transformer T 1the different name end of former limit winding be connected with DC power supply negative terminal, described high frequency transformer T 1vice-side winding export direct current by rectification filtering unit,
It is characterized in that:
Described many level DC converters also comprise four self-turn-off device S 5, S 6, S 7, S 8, two transformer T 2and T 3, every self-turn-off device also inverse parallel diode,
Self-turn-off device S 5, S 6, S 7, S 8, S 2, S 3form three-phase inversion half-bridge circuit, S 5, S 6be two brachium pontis of a single-phase inversion half-bridge circuit, S 7, S 8be two brachium pontis of a single-phase inversion half-bridge circuit, S 2, S 3be two brachium pontis of a single-phase inversion half-bridge circuit,
Described T 2and T 3former limit winding different name end all and S 7, S 8tie point connect, described T 2the Same Name of Ends of former limit winding and S 2, S 3tie point connect, described T 3the Same Name of Ends of former limit winding and S 7, S 8tie point connect,
Described T 2and T 3vice-side winding and T 1vice-side winding be in series and export direct current by rectification filtering unit.
2. the many level DC converters of pole low output voltage ripple diode clamp according to claim 1, is characterized in that:
Described rectification filtering unit comprises diode full bridge rectifier and LC filter circuit, described T 2and T 3vice-side winding and T 1vice-side winding be in series after successively by diode full bridge rectifier and the whole output direct current of LC filter circuit.
3. a DC power supply, it is characterized in that: comprise three-phase alternating-current supply, diode rectifier circuit, DC converter, described three-phase alternating-current supply is connected with DC converter by diode rectifier circuit, and the structure of described DC converter is as described in one of claim 1-2.
4. DC power supply according to claim 5, is characterized in that: described diode rectifier circuit is three-phase bridge diode uncontrollable rectifier unit.
CN201410714309.7A 2014-11-29 2014-11-29 Ultralow-output-voltage-ripple diode-clamped multi-level direct-current converter and direct-current power supply Active CN104539160B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107040141A (en) * 2016-02-02 2017-08-11 Tdk株式会社 Switching power unit
CN108173442A (en) * 2018-01-18 2018-06-15 东北电力大学 Isolated form Modular multilevel converter based on High Frequency Link technology
CN109980970A (en) * 2019-04-26 2019-07-05 湖南大学 Frequency multiplier type three-level inverter and its use, packaging method
CN111669054A (en) * 2019-03-05 2020-09-15 Tdk株式会社 Switching power supply device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100405723C (en) * 2006-12-08 2008-07-23 南京航空航天大学 PWM combined three level DC converter of Zero voltage switch
CN102420538A (en) * 2011-12-01 2012-04-18 西安爱科电子有限责任公司 Diode clamping seven-level DC-AC (direct current and alternate current) transformation circuit
CN102437764A (en) * 2011-10-09 2012-05-02 西安爱科电子有限责任公司 Seven-electrical level DC-AC converter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100405723C (en) * 2006-12-08 2008-07-23 南京航空航天大学 PWM combined three level DC converter of Zero voltage switch
CN102437764A (en) * 2011-10-09 2012-05-02 西安爱科电子有限责任公司 Seven-electrical level DC-AC converter
CN102420538A (en) * 2011-12-01 2012-04-18 西安爱科电子有限责任公司 Diode clamping seven-level DC-AC (direct current and alternate current) transformation circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107040141A (en) * 2016-02-02 2017-08-11 Tdk株式会社 Switching power unit
CN107040141B (en) * 2016-02-02 2019-04-30 Tdk株式会社 Switching power unit
CN108173442A (en) * 2018-01-18 2018-06-15 东北电力大学 Isolated form Modular multilevel converter based on High Frequency Link technology
CN111669054A (en) * 2019-03-05 2020-09-15 Tdk株式会社 Switching power supply device
CN111669054B (en) * 2019-03-05 2023-12-26 Tdk株式会社 Switching power supply device
CN109980970A (en) * 2019-04-26 2019-07-05 湖南大学 Frequency multiplier type three-level inverter and its use, packaging method

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