WO2002061934A1 - Power conversion system and method of power conversion - Google Patents
Power conversion system and method of power conversion Download PDFInfo
- Publication number
- WO2002061934A1 WO2002061934A1 PCT/US2002/002495 US0202495W WO02061934A1 WO 2002061934 A1 WO2002061934 A1 WO 2002061934A1 US 0202495 W US0202495 W US 0202495W WO 02061934 A1 WO02061934 A1 WO 02061934A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- converting
- power conversion
- stage
- common mode
- Prior art date
Links
Classifications
-
- 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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2173—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a biphase or polyphase circuit arrangement
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Definitions
- the invention relates to a method and apparatus for AC/DC conversion with continuous sinusoidal input currents, and a controlled isolated output voltage that shows one or more of the advantages of substantially reduced electromagnetic interference (EMI) noise and substantially reduced total harmonic distortion (THD).
- EMI electromagnetic interference
- TDD total harmonic distortion
- the power conversion system typically includes a second stage that is a DC/DC converter, in which the DC-link voltage is identical to the (relatively high) output- voltage of the AC/DC converter at the input side.
- Emission of electromagnetic interference (EMI) due to common-mode disturbances remains one of the problems of pulse-width modulated (PWM) rectifier systems.
- PWM pulse-width modulated
- boost-type pulse- width modulation the power switches of the rectifier system are switched at a significantly higher frequency than the mains frequency.
- the DC- (link) output voltage is lying across the input inductance of the according phase whenever the power switch is in the ON state. This makes the input current rise or fall, and the input current can thereby be effectively controlled.
- concurrently the output voltage alternates between zero and maximum voltage at the switching frequency.
- the output side (which is the DC-link voltage of a two-stage system) resultantly has fault currents through parasitic stray capacitors that result in the emission of EMI-noise.
- the DC/DC-stage that also employs pulse width modulation.
- PFC power factor correction
- the invention herein provides an effective apparatus and method for reducing the expense and bulk of filtering and shielding necessitated by the EMI-noise of an AC/DC power conversion system, without increasing THD. This is accomplished by combining an AC/DC converter, which, due to its power circuit configuration, presents 50% of the DC-link voltage as blocking voltage, with a DC/DC converter, which due to its power circuit configuration, presents 50% of the DC-link voltage to each of its power switches.
- the present invention includes a method of reducing electromagnetic interference (EMI) and/or total harmonic distortion (THD) during multiple stage AC to DC power conversion, which may include the step of converting AC to high voltage DC by means of a three-phase/switch/level boost type pulse-width modulation rectifier as well as the step of converting higher voltage DC to lower voltage DC by means of a system of partial DC to DC converters connected in series at their primary sides, and connected in parallel at their secondary sides. Additionally, one may add the step of filtering by means of common mode filters between converting AC to high voltage DC and converting the higher voltage DC to lower voltage DC to the method of the present invention. A further step one may add is filtering by means of common mode filters after converting higher voltage DC to lower voltage DC. Another step one may add is to repeat the step of converting higher voltage DC to lower voltage DC. Additionally, one may add the step of filtering by means of common mode filters between the repeated DC to DC conversion steps.
- EMI electromagnetic interference
- TDD total harmonic distortion
- An other object of the present invention is to provide an AC to DC power conversion system which may include a first stage of a three-phase/switch/level boost type pulse width modulation rectifier that converts AC to high voltage DC, having outputs, and at the outputs, a second stage of a system of DC to DC converters connected to each other in series at their primary sides and connected to each other in parallel at their secondary sides.
- This DC to DC conversion may be accomplished by using half-bridge or full-bridge pulse-width modulation type DC to DC converters.
- a method of reducing total harmonic distortion during multiple stage AC to DC power conversion may include the step of converting AC to high voltage DC by means of a three-phase/switch/level boost type pulse- width modulation rectifier as well as the step of converting higher voltage DC to lower voltage DC by means of a system of partial DC to DC converters connected in series at their primary sides, and connected in parallel at their secondary sides.
- a further step one may add is inserting common mode filters after converting higher voltage DC to lower voltage DC.
- Another step one may add is to repeat the step of converting higher voltage DC to lower voltage DC.
- a final step one may add is inserting common mode filters between the repeated DC to DC conversion steps.
- the present invention in its several embodiments produces superior performance over state-of-the-art systems by minimizing cost, size, and complexity while reducing THD and EMI.
- the invention utilizes circuit configurations rather than complex control schemes to keep EMI and THD low, efficiently and simultaneously. It is understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the inventions claimed.
- Figure 2 is a schematic diagram of another preferred embodiment of the present invention.
- Figure 3 is a schematic diagram of a further preferred embodiment of the present invention.
- the invention herein provides a method and apparatus that combine a state-of-the-art PFC three-phase/level/switch PWM boost-type rectifier, in which the power circuit configuration presents a blocking voltage stress of, for example, approximately 50% of the DC-link voltage, with a DC/DC converter system, in which also the power circuit configuration presents a blocking voltage stress of, for example, approximately 50% of the DC-link voltage.
- the DC/DC converter may, for example, consist of two or more partial DC/DC converter systems that are connected at their primary sides in series so that each partial system faces only a portion (one-half in the case of two partial systems) of the DC-link voltage at its primary side. Therefore, the maximum blocking voltage of all power switches at the primary sides of the two partial DC/DC converters can be reduced to approximately one-half of the DC-link voltage resulting in a corresponding reduction in the emitted EMI-noise from the parasitic stray capacitors connecting the primary windings of the two partial DC/DC converters to the mains star point.
- This combination of partial power conversion systems may, for example, ensure that substantially all the power switches of the apparatus face approximately 50% of the blocking voltage compared to the DC-link voltage, and the total EMI-noise of the apparatus may, therefore, be consequently reduced by approximately 50% when compared to state-of-the-art single-stage and two-stage PFC AC/DC power conversion systems (such as, for example, six- switch two-level AC to DC converters). Because of this reduction of the EMI-noise of the apparatus, which results from the described combination of at least one embodiment of the power circuits of the partial systems, the subsequent filtering and shielding effort for the power conversion system is reduced significantly, without an increase in THD.
- the apparatus for AC/DC power conversion with power factor correction and isolated controlled output voltage with reduced emission of EMI-noise comprises a three-phase/three- level/three-switch PWM boost-type rectifier 1 that is connected in series with a DC/DC converter 2 with high frequency isolation, where this DC/DC converter 2 consists, for example, of two partial systems 21 and 42 connected in series at their primary sides.
- the terminals 9, 10, 11 connect the AC/DC converter 1 to a three-phase input voltage system 45, 46, 47 with a mains star point 48.
- the output of the AC/DC converter 1 is formed by a series connection of two output capacitors 12 and 13 that connect the positive terminal 6 with the negative terminal 7, defining a neutral point 14 that can be connected directly to the converter input terminals 49, 50, 51 by closing the power switches 3, 4, 5.
- the partial output voltage between the positive terminal 6 and the neutral point 14 is approximately equal to the partial voltage between the neutral point 14 and the negative terminal 7. Therefore, the output voltage between the positive terminal 6 and the negative terminal 7 is the DC-link voltage of the two-stage power conversion system and is twice the partial output voltages.
- the current through the inductor 8 flows via the diodes 17 and 15 into the positive terminal 6, while the diodes 18, 19, 20 are in the OFF state.
- the blocking voltage of the power switch 3 is defined by the partial output voltage between positive terminal 6 and neutral point 14 because an increasing blocking voltage stress introduces a leakage current through the power switch 3 that opens diode 20 that is clamping the blocking voltage to the partial output voltage across the partial output capacitor 12.
- the maximum blocking voltage stress of the power switch 3 is clamped by the diode 19 to the partial output voltage across the capacitor 13.
- the converter input terminal 49 is connected to the positive terminal 6 via the diodes 15 and 17.
- the converter input terminal 49 is connected to the neutral point 14 via the power switch 3 and the diodes 17 and 20, regardless of the polarity of the input current through inductor 8. Therefore, switching the power switch 3 from the OFF state into the ON state reduces the voltage potential of the converter input terminal 49 by the voltage blocking stress of the power switch 3, which is equal to half of the DC-link voltage between the positive terminal 6 and the negative terminal 7.
- a power system comprising the AC/DC converter 1 may be, for example, connected to the
- the primary side of the DC/DC converter 2 comprises via terminal 52 a series connection of the primary sides of two partial converter systems 21 and 42.
- the secondary sides of the partial systems 21 and 42 are connected in parallel via the output inductor 38 that forms an output filter together with the output capacitor 39.
- terminal 52 is connected to the neutral point 14, in this embodiment of the present invention, the partial input voltages of the capacitors 12 and 13 are impressed as input voltages of the partial DC/DC converter systems 21 and 42.
- the maximum blocking voltages of the power switches 26 and 27 of the partial system 21 and the power switches 30 and 31 of the partial system 42, respectively, are limited to the partial output voltage between the positive terminal 6 and the neutral point 14, and the neutral point 14 and the negative terminal 7, which is always half of the DC-link voltage.
- the terminal 54 of the primary winding 22 is connected to the positive terminal 6, and the terminal 53 of the primary winding 22 is connected to the terminal 52 and, thus, to the neutral point 14.
- the diodes 24 and 25 are in free-wheeling state so that the terminal 53 of the primary winding 22 is connected to the positive terminal 6, and the terminal 54 of the primary winding 22 is connected to the terminal 52 and the neutral point 14.
- the change between the ON state and the OFF state of both power switches 26 and 27 changes the voltage potential between the terminals 53 and 54 of the primary winding 22 with the switching frequency by the maximum blocking voltage stress of the power switches 26 and 27 of the partial system 21.
- This blocking voltage stress is equal to half of the DC- link voltage between positive terminal 6 and negative terminal 7.
- the parasitic stray capacitors (not shown in Figure 1, because they are merely models of unavoidable non- idealities that exist in the materials of the circuit) connecting the terminals 53 and 54 of the winding 22 with the mains star point 48 introduce fault currents that result in the emission of EMI-noise.
- the same process of switching occurs in the partial system 42 attached to the winding 32, and the analysis presented above can therefore be applied.
- the blocking voltage of all power switches 26, 27, 30, 31 and therefore the EMI-noise emission of the DC/DC-converter 2 can be reduced to approximately 50%, by comparison to the state-of-the-art systems (such as, for example, systems consisting of a single DC to DC converter) with blocking voltage stress of the power switches equal to the DC-link voltage between the terminals 6 and 7.
- the AC/DC converter 1 and the DC/DC converter 2 can be, for example, connected by means of a common-mode filter-inductor 55, 56.
- the input side of the DC/DC converter 2 can be, for example, formed by a series-connection of two capacitors 57 and 58 that define a neutral point 52 of the DC/DC converter 2 that is not connected to the neutral point 14 of the AC/DC converter 1.
- the DC-link capacitors 12 and 13 may define the output of the AC/DC converter 1.
- the two partial systems 21 and 42 of the DC DC converter 2 can be realized at their primary sides by full bridge legs comprising the power switches 26, 27, 60, 61 with the free-wheeling diodes 64, 65, 66, 61 of the partial system 21, and the power switches 30, 31, 62, 63 with the free-wheeling diodes 68, 69, 70, 71 of the partial system 42, respectively.
- the terminal 52 that connects the two partial systems 21 and 42 in series is connected to the neutral point 14 so that all power switches 26, 27, 60, 61, 30, 31, 62, 63 face a maximum blocking voltage of half of the DC-link voltage occurring between the positive terminal 6 and the negative terminal 7.
- the secondary sides of the partial systems with the windings 72 and 33 are connected in a parallel-comiection to define a controlled and isolated output voltage between the terminals 40 and 41.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Rectifiers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02707599A EP1410487A1 (en) | 2001-01-31 | 2002-01-30 | Power conversion system and method of power conversion |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/774,108 US6385057B1 (en) | 2001-01-31 | 2001-01-31 | Power conversion system and method of power conversion |
US09/774,108 | 2001-01-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002061934A1 true WO2002061934A1 (en) | 2002-08-08 |
Family
ID=25100265
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/002495 WO2002061934A1 (en) | 2001-01-31 | 2002-01-30 | Power conversion system and method of power conversion |
Country Status (3)
Country | Link |
---|---|
US (1) | US6385057B1 (en) |
EP (1) | EP1410487A1 (en) |
WO (1) | WO2002061934A1 (en) |
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WO2001050583A1 (en) * | 2000-01-05 | 2001-07-12 | Ascom Energy Systems Ag | Three phase-electrical intermediate circuit having reduced network feedback-identical pulse-director system with a wide positioning range pertaining to the output voltage |
US7615893B2 (en) * | 2000-05-11 | 2009-11-10 | Cameron International Corporation | Electric control and supply system |
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- 2001-01-31 US US09/774,108 patent/US6385057B1/en not_active Expired - Fee Related
-
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- 2002-01-30 WO PCT/US2002/002495 patent/WO2002061934A1/en not_active Application Discontinuation
- 2002-01-30 EP EP02707599A patent/EP1410487A1/en not_active Ceased
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USRE29560E (en) * | 1973-10-23 | 1978-02-28 | Asea Aktiebolag | Peak load levelling system |
US4062057A (en) * | 1977-04-15 | 1977-12-06 | The United States Of America As Represented By The Secretary Of The Navy | Regulated power supply having a series arrangement of inverters |
US5432695A (en) * | 1993-09-17 | 1995-07-11 | The Center For Innovative Technology | Zero-voltage-switched, three-phase PWM rectifier inverter circuit |
US5546295A (en) * | 1994-02-24 | 1996-08-13 | Rotron Incorporated | Electrical power converter, power supply, and inverter with series-connected switching circuits |
US5633793A (en) * | 1995-01-23 | 1997-05-27 | Center For Innovative Technology | Soft switched three-phase boost rectifiers and voltage source inverters |
US5684683A (en) * | 1996-02-09 | 1997-11-04 | Wisconsin Alumni Research Foundation | DC-to-DC power conversion with high current output |
US5771163A (en) * | 1996-11-19 | 1998-06-23 | Sansha Electric Manufacturing Company, Limited | AC-DC converter apparatus |
Also Published As
Publication number | Publication date |
---|---|
US6385057B1 (en) | 2002-05-07 |
EP1410487A1 (en) | 2004-04-21 |
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