WO2004064456A1 - Three-level dc-ac converter - Google Patents
Three-level dc-ac converter Download PDFInfo
- Publication number
- WO2004064456A1 WO2004064456A1 PCT/IB2003/005823 IB0305823W WO2004064456A1 WO 2004064456 A1 WO2004064456 A1 WO 2004064456A1 IB 0305823 W IB0305823 W IB 0305823W WO 2004064456 A1 WO2004064456 A1 WO 2004064456A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- lamp
- switch elements
- input
- output
- 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
- 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
- H02M7/487—Neutral point clamped inverters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
- H05B41/285—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2851—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions
- H05B41/2856—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the circuit against abnormal operating conditions against internal abnormal circuit conditions
Definitions
- the invention relates to a DC/ AC converter for the supply of TL-lamps which is adapted to supply the lamp with a three level voltage.
- Such converters are generally known. They comprise two switch elements which are adapted to subsequently connect one connection of the lamp with a positive and a negative supply voltage respectively. To avoid short circuits between the positive and the negative voltage, the switch element being on is switched off before the other switch element is switched on. Consequently during a short period of time the lamp is connected with neither the positive nor the negative supply voltage. During these short periods, the voltage supplied to the lamp is floating. This means that the voltage is determined by capacitances between conductors of said voltage and ground etc. and by the electric charges present during the switching off of the switch element concerned. As a consequence thereof the lamp will be subjected to an annoying flickering.
- the aim of the invention is to avoid the floating of the voltage supplied to the lamp during any moment of the switching cycle.
- a DC/ AC converter for supply of TL-lamps, comprising a first input to be connected to a positive DC voltage, a second input to be connected to a negative DC voltage, a third input to be connected to a ground voltage, a series connection of a first, a second, a third and a fourth switch element between the first connection and the second connection, a first diode of which the anode is connected to the third input and of which the cathode is connected to the junction of the first and the second switch element, a second diode of which the anode is connected to the junction between the third and the fourth switch element and the cathode of the diode is connected to the third input, an inductor, connected between the junction between the second and third switch elements and a first output, a second output connected to third input and a control circuit for controlling the first to fourth switch elements, such that subsequently a ground voltage, a positive voltage, a ground voltage, a negative voltage and a ground voltage is obtained on the first output
- the third input is connected to the first input by a first capacitor, and to the second input by a second capacitor, wherein both capacitors have substantially the same capacitance.
- the configuration according to the main claim is applicable to situations wherein three supply voltages are available, that is a positive supply voltage, a ground voltage and a negative supply voltage. In most situations only a positive voltage and a negative voltage are available.
- This preferred embodiment allows provides a simple cost effective solution for the generation of an intermediate voltage which can be used as ground voltage.
- the configuration according to the present invention is especially applicable as a supply unit for TL lamps. As these are present huge numbers, it is feasible to develop these units for mass production.
- each of the switch elements is formed by a semiconductor switch element and that each of the switch elements comprises a bypass diode connected anti-parallel to the semiconductor element.
- the free wheel diodes have to be of a special construction, inhibiting implementation in integrated form by technologies used for the implementation of the switch elements.
- the present invention produces less high voltage surges which can be absorbed by free wheel diodes of more conventional construction, allowing the free wheel diodes to be integrated by the same technologies as the switch elements.
- FIG. 1 shows a circuit diagram of a prior art circuit for supplying a TL-lamp
- Fig. 2 shows a circuit diagram of a circuit according to the invention
- Fig 3 shows a time diagram of the position of the switch elements and the resulting output voltage.
- the prior art circuit depicted in Fig. 1 comprises two inputs 1,2 to be connected to a DC supply source and between which a series connection of two switch elements 11 and 14 have been connected.
- the junction between the two switch elements 11 , 14 is connected with the TL-lamp 15, and in series with the TL-lamp 15 an inductor 16 has been provided.
- the other connection of the TL-lamp 15 is connected with a series connection of two capacitors 3,4 with a substantially equal capacitance, of which the junction is connected with the TL-lamp 15.
- control circuit 5 has been provided for control of the switch elements 11 and 14. It is noted that these switch elements 11,14 will usually be formed by semiconductor elements, free wheel diodes must connected anti parallel with the switch elements.
- the control circuit is adapted to close only one of the switch elements 11 or 12. As it is impossible to open one of the switch elements and close the other simultaneously it is unavoidable that during short periods both switch elements will be closed. During these periods the voltage on the junction between those switch elements is only determined by parasitic capacitances and inductances leading to a fluctuating voltage and hence flickering of the lamp.
- circuit according to the present invention which is depicted in Fig. 2 avoids these problems by the presence of two additional switching elements 11-14
- This circuit according to the invention comprises just as in the prior art two inputs 1,2 to supply a DC voltage.
- the cathode of a diode 17 is connected with the junction between the switch elements 11 and 12, while the anode of the diode 17 is connected with the junction between the capacitors 3 and 4.
- the anode of a diode 18 is connected with the junction of the switch elements 13 and 14, while the cathode of the diode 18 is connected with the junction of the capacitors 3 and 4.
- a control circuit 5 has been provided to control the opening and closure of the switch elements 11-14.
- switch element 13 As a preparation for the connection to the lower voltage, switch element 13 is closed, providing another connection to the intermediate voltage. This allows the switch element 12 to open, while maintaining the connection to the intermediate voltage. Subsequently the switch element 14 can be closed, connecting the lamp to the negative voltage. It will be clear that many variations can be applied to the disclosed circuit without departing from the scope of the invention.
- the power supplied the lamp 15 can be controlled, executing a dimming function. This is depicted in the second half of Fig. 3 during which the periods in which a positive voltage or a negative voltage is supplied to the lamp is remarkable shorter than in the first half of the diagram.
- the diodes serve to avoid short circuits during periods wherein the switch elements 11 and 14 are closed, and provide a connection with the intermediate voltage otherwise. In the control of the switch elements care should be taken to open any three of the switch elements at any time as this would lead to a short circuit.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/541,978 US20060049813A1 (en) | 2003-01-14 | 2003-12-05 | Three-Level dc-ac converter |
EP03775736A EP1588589A1 (en) | 2003-01-14 | 2003-12-05 | Three-level dc-ac converter |
AU2003283755A AU2003283755A1 (en) | 2003-01-14 | 2003-12-05 | Three-level dc-ac converter |
JP2004566175A JP2006513538A (en) | 2003-01-14 | 2003-12-05 | 3-level DC / AC converter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03100045.8 | 2003-01-14 | ||
EP03100045 | 2003-01-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004064456A1 true WO2004064456A1 (en) | 2004-07-29 |
Family
ID=32695634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2003/005823 WO2004064456A1 (en) | 2003-01-14 | 2003-12-05 | Three-level dc-ac converter |
Country Status (6)
Country | Link |
---|---|
US (1) | US20060049813A1 (en) |
EP (1) | EP1588589A1 (en) |
JP (1) | JP2006513538A (en) |
CN (1) | CN1739320A (en) |
AU (1) | AU2003283755A1 (en) |
WO (1) | WO2004064456A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012154810A3 (en) * | 2011-05-11 | 2013-09-12 | Eaton Corporation | Power conversion apparatus and methods employing variable-level inverters |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8779745B2 (en) * | 2010-03-01 | 2014-07-15 | National Semiconductor Corporation | Three-quarter bridge power converters for wireless power transfer applications and other applications |
GB2536731B (en) | 2015-03-27 | 2021-05-12 | Tridonic Gmbh & Co Kg | High frequency PFC topology |
US20180337613A1 (en) * | 2015-11-24 | 2018-11-22 | Koninklijke Philips N.V. | X-ray system with switching device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2807233A1 (en) * | 2000-03-31 | 2001-10-05 | Nordson Corp | INVERTER CIRCUIT |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4203151A (en) * | 1978-09-21 | 1980-05-13 | Exxon Research & Engineering Co. | High-voltage converter circuit |
JP2566021B2 (en) * | 1989-11-22 | 1996-12-25 | 三菱電機株式会社 | Operating method of inverter device |
JP3102499B2 (en) * | 1991-02-28 | 2000-10-23 | 株式会社東芝 | Neutral point clamp type power converter controller |
DE19536470A1 (en) * | 1995-09-29 | 1997-04-03 | Siemens Ag | Low-loss power inverter |
JP3263317B2 (en) * | 1996-06-18 | 2002-03-04 | 株式会社東芝 | Switching module and power converter using the module |
JP3900220B2 (en) * | 1997-10-28 | 2007-04-04 | 株式会社安川電機 | Inverter device having three-level neutral clamp type inverter circuit |
JP3383588B2 (en) * | 1998-08-04 | 2003-03-04 | 株式会社東芝 | Power converter |
US6353547B1 (en) * | 2000-08-31 | 2002-03-05 | Delta Electronics, Inc. | Three-level soft-switched converters |
US6838925B1 (en) * | 2003-10-07 | 2005-01-04 | American Power Conversion Corporation | Three level inverter |
-
2003
- 2003-12-05 CN CNA2003801087214A patent/CN1739320A/en active Pending
- 2003-12-05 US US10/541,978 patent/US20060049813A1/en not_active Abandoned
- 2003-12-05 AU AU2003283755A patent/AU2003283755A1/en not_active Abandoned
- 2003-12-05 EP EP03775736A patent/EP1588589A1/en not_active Withdrawn
- 2003-12-05 JP JP2004566175A patent/JP2006513538A/en not_active Withdrawn
- 2003-12-05 WO PCT/IB2003/005823 patent/WO2004064456A1/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2807233A1 (en) * | 2000-03-31 | 2001-10-05 | Nordson Corp | INVERTER CIRCUIT |
Non-Patent Citations (1)
Title |
---|
JI TAEK YOON ET AL: "Base/gate drive suppression methods for NPC inverter legs", INDUSTRIAL ELECTRONICS, CONTROL, AND INSTRUMENTATION, 1996., PROCEEDINGS OF THE 1996 IEEE IECON 22ND INTERNATIONAL CONFERENCE ON TAIPEI, TAIWAN 5-10 AUG. 1996, NEW YORK, NY, USA,IEEE, US, 5 August 1996 (1996-08-05), pages 1784 - 1789, XP010203252, ISBN: 0-7803-2775-6 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012154810A3 (en) * | 2011-05-11 | 2013-09-12 | Eaton Corporation | Power conversion apparatus and methods employing variable-level inverters |
CN103534923A (en) * | 2011-05-11 | 2014-01-22 | 伊顿公司 | Power conversion apparatus and methods employing variable-level inverters |
US8730691B2 (en) | 2011-05-11 | 2014-05-20 | Eaton Corporation | Power conversion apparatus and methods employing variable-level inverters |
Also Published As
Publication number | Publication date |
---|---|
US20060049813A1 (en) | 2006-03-09 |
CN1739320A (en) | 2006-02-22 |
AU2003283755A1 (en) | 2004-08-10 |
EP1588589A1 (en) | 2005-10-26 |
JP2006513538A (en) | 2006-04-20 |
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