EP2484183A1 - Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer entladungslampe - Google Patents
Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer entladungslampeInfo
- Publication number
- EP2484183A1 EP2484183A1 EP10744908A EP10744908A EP2484183A1 EP 2484183 A1 EP2484183 A1 EP 2484183A1 EP 10744908 A EP10744908 A EP 10744908A EP 10744908 A EP10744908 A EP 10744908A EP 2484183 A1 EP2484183 A1 EP 2484183A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electronic switch
- electronic
- switch
- coupled
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- 230000001965 increasing effect Effects 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract 2
- 230000001939 inductive effect Effects 0.000 description 5
- 230000007704 transition Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Classifications
-
- 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
- H05B41/2825—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 by means of a bridge converter in the final stage
- H05B41/2828—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 by means of a bridge converter in the final stage using control circuits for the switching elements
Definitions
- the present invention relates to an electronic ballast for operating at least one discharge lamp with an input having a first and a second input terminal for coupling to a supply ⁇ DC voltage, an output having a first and a second output terminal for coupling to the at least one discharge lamp, an inverter having a bridge circuit with at least a first and a second electronic switch and a control device for controlling at least the first and the second electronic switch such that the first and the second electronic switch are alternately turned on at a first frequency, wherein the first and second switches are serially coupled between the first and second input terminals, wherein the first electronic switch is coupled to the first input terminal and the second electronic switch is coupled to the second input terminal i between the first and the second electronic switch, a first bridge center is formed, a current ⁇ measuring device for measuring the current at least by the second electronic switch, a lamp inductor which is serially coupled between the first bridge center and the first output terminal, at least ei ⁇ nem Trapezoidal capacitor, which is coupled in parallel to one of the two electronic switches
- the present invention has for its object a generic electronic Vorschaltge- advises or further developing such a generic method that, even when an operation of the electro ⁇ African ballast in the vicinity of the phase jump at different loads connected to a switching unloaded operation at the lowest possible losses can be provided ⁇ .
- the present invention is based on the finding that the above problem can be met if the frequency with which the switches of the half-bridge are operated is increased when a switching operation is detected after reaching the maximum dead time.
- the operating frequency is shifted from inductive operation to a transient frequency between capacitive and inductive operation. This results in an increase in the negative current amplitude when taking over the current through the free ⁇ running diode of the lower switch.
- the Radiofre ⁇ frequency of the two switches increased so far that the vorgeb- bare negative threshold value of the current through the lower switch is exceeded again, so does the known dead time control again; Switch-relieved operation of the inverter switches can be ensured.
- Each of the two electronic switches comprises a control electrode, a working electrode and a reference electrode ⁇ . It can now be provided that the path working electrode reference electrode is connected in parallel with a discrete diode as a freewheeling diode or that the freewheeling diode is a body diode of the electronic switch. The latter is the case, for example, when mosfet transistors are used as switches.
- control device of a modern fiction, ⁇ electronic ballast comprises a memory in which the prescribable time duration is stored. This opens up the possibility, in particular, of modifying these for specific lamps.
- control device comprises a timing device which is designed to determine the time ⁇ duration after the Sperrend switching of the first electronic switch see until Leitend switching of the second e- lektronischen switch.
- the control device is designed to carry out the following step: c1) If the measured time duration is equal to the predefinable time duration: increase the first frequency by a predefinable step.
- the control device is further adapted to perform the following step: c2) repeat step cl) at least as long until the measured time period is less than the predetermined time duration ⁇ . This results in the sum that the operating frequency of the switches of the half-bridge is increased in predetermined stages until the dead time no longer corresponds to the maximum dead time.
- control device is designed to carry out the following step: d1) If the measured time duration is less than the predefinable time duration: decrease the first frequency by a predefinable step.
- control device is preferably designed to carry out the following step: d2) Repeat step d1) until a predefinable value for the first frequency has been reached.
- Fig. 2 shows a schematic representation of the dependence of
- Fig. 3 shows the time course of various electrical
- FIG. 1; and Fig. 4 a schematic illustration of a signal flow graph of an embodiment of erfindungsge ⁇ MAESSEN Totzeitregelung.
- Fig. 1 shows a schematic representation of an embodiment of an electronic ballast according to the invention.
- the electronic ballast shown in Fig. 1 has an input with a first El and a second input terminal E2 for coupling to a DC supply voltage.
- this is the so-called intermediate circuit voltage U Zw , which is usually obtained from an AC line voltage.
- This intermediate circuit voltage U Zw is applied to an inverter 10, comprising a first Sl and a second electronic switch S2 in half-bridge arrangement.
- a control device 12 is provided for controlling the switches Sl, S2, .
- the control device 12 controls the switches S1, S2 in particular in such a way that the first and the second switches S1, S2 are alternately turned on with a first frequency.
- the STEU ⁇ device 12 is coupled to a current measuring device, which in the present case comprises a shunt resistor R s , which is arranged serially to the first switch Sl.
- the current flowing through the shunt resistor R s is denoted by I s .
- the switches Sl, S2 are alsobil ⁇ det as Mosfet, wherein for simplification of the following explanations, the respective body diode Dl, D2, which acts here in each case as a freewheeling diode, is located.
- a first half-bridge center point HBM is formed, wherein the voltage dropping at the Halb Georgianmit ⁇ tel Vietnamese voltage U is designated HBM.
- Pa ⁇ rallel to the lower half-bridge branch is a capacitor C t Trapezkon- coupled.
- a lamp inductor L R is coupled between the first half-bridge center HBM and a first output terminal AI of the electronic ballast.
- an output voltage U ⁇ R is provided to a load R L of the products contained ⁇ neighborhood comprises at least one discharge lamp.
- a coupling capacitor C c is coupled. Parallel to the series connection of the load R L and the coupling capacitor C C is a Resonanzkondensa ⁇ tor C R coupled.
- Fig. 2 shows a schematic representation of the dependence of the voltage U R readiness provided between the output terminals Al, A2 of the operating frequency f R with which the control device 12 controls the switches Sl, S2, for two different loads R L.
- Curve 1) represents a low-impedance load 1) (low burning ⁇ voltage, low output power) with a resonant frequency f Ri , curve 2) a higher-impedance load 2) with a resonant frequency f R2 .
- the frequency f R2 is greater than the frequency f R1 .
- the frequency f 0 of the resonant circuit would be operated with the first ⁇ said load (curve 1)) inductively, capacitively coupled to the second-mentioned load (curve 2)).
- Fig. 3 shows the time characteristics of different sizes of the embodiment of Fig. 1. It shows insbeson ⁇ particular the timing of the inputs and Ausschaltzu ⁇ stands of the switch S2 (curve a)), the voltage U HBM (curve b)), and the on and off state of the switch Sl (curve c)).
- phase 1 the switch S2 is on, that is conductive. This is the reason Potential at the half-bridge center on the potential of the intermediate circuit voltage U Zw .
- the switch S1 is off during this time.
- the current through the shunt resistor R s is also zero. In phase 1, therefore, the current flows through the switch S2, the inductor L R to the load R L.
- phase 2 The transition to phase 2 is characterized in that the switch S2 goes into the off state, while the switch Sl is not yet turned on. Accordingly, the current driven by the inductor L R flows from the trapezoidal capacitor C T through the inductor L R to the load R L. The potential at the half-bridge center point li ⁇ near is reduced to zero.
- the beginning of phase 2 corresponds to the beginning of the dead time t dead -
- the transition from phase 2 to phase 3 is characterized by the fact that the trapezoidal capacitor is discharged.
- the freewheeling diode Dl is conductive and clamps the voltage at the half-bridge center to about -0.7 V.
- the current now flows through the freewheeling diode Dl, the inductor L R to the load R L. With reference to curve d), therefore, a negative current flows I s from the time at which the free-wheeling diode Dl ⁇ has become conductive. If this reaches a threshold I Th res / so this is used according to the prior art to solve the switch-on of the switch Sl ⁇ .
- the switch-on process of the switch Sl represents the beginning of the phase 4.
- the period between the beginning of the phase 2 and the end of the phase 3 represents the dead time t d ea d .
- the phase 3 denotes the time interval, in ⁇ within which the switch Sl switch-relieved can be switched.
- the voltage U HBM dropping across the switch S1 is equal to zero within this period.
- the current now begins to flow through the switch S1, whereby the current flow in the phase 4, see curve d) until the switch S1 is turned off runs approximately sinusoidally.
- the marked with respective superscript curve curves result in an increase in the load R L , ie, with reference to FIG. 2 at load 2).
- FIG. 4 shows a schematic representation of a signal flow graph for controlling the dead time tdead.
- the method starts in step 100.
- step 120 it is checked whether the dead time tdead measured by the time measuring device is equal to the predefinable time t t imeout.
- step 140 the frequency f R , with which the switches of the half-bridge are operated, increased. Subsequently, step 120 is repeated.
- step 140 see FIG. 2 further postponed the re ⁇ sonanzfrequenz back into the inductive region. This results in a larger negative current amplitude when taken over by the freewheeling diode, as a result of which the dead time control functions again.
- step 160 it is checked in step 160 whether the current Radiofre acid sequence f R is greater than a nominal operating frequency f nom.
- the nominal operating frequency f nom represents a mini ⁇ mal operating frequency of the electronic ballast. If it is found that the current Radiofre ⁇ frequency f R is above the nominal operating frequency f nom , so in step 180, the operating frequency f R is reduced and then branched back to start ,
- step 160 If, however, it is determined in step 160 that the nomina ⁇ le operating frequency f nom has been reached, then without a change of the current operating frequency f R is branched back to the start.
- the execution of steps 160, 180 is of particular importance when initially a lamp with a higher operating voltage was operated on the electronic ballast and its burning voltage subsequently dropped, for example due to thermal effects.
- Oh ⁇ ne control to the nominal operating frequency f nom the lamp would be operated in this case permanently at an increased frequency and thus at reduced power.
- the control relationship illustrated in FIG. 4 makes it possible to operate the dead-time control and also to operate each lamp connected to the electronic ballast with the optimum operating frequency.
- the respective achievement of the predefinable time duration t t imeout can be recorded in a particularly simple digital manner.
- the raised stabili ⁇ hung the half-bridge frequency can be digital, depending on the implementation, for example, by digital PWM register for the switch-on times of the switching elements, or analogously by an offset at the input of VCO or CCO.
- the illustrated in Fig. 4 sequence should be finally activated from ⁇ during combustion operation and not during the Vorhei ⁇ wetting or ignition of the discharge lamp, however, to avoid unwanted interactions with other protection and control mechanisms.
- the trapezoidal capacitor Ct and the coupling capacitor C c may also be located elsewhere.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200910043611 DE102009043611A1 (de) | 2009-09-29 | 2009-09-29 | Elektronisches Vorschaltgerät und Verfahren zum Betreiben mindestens einer Entladungslampe |
| PCT/EP2010/061769 WO2011038974A1 (de) | 2009-09-29 | 2010-08-12 | Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer entladungslampe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2484183A1 true EP2484183A1 (de) | 2012-08-08 |
| EP2484183B1 EP2484183B1 (de) | 2013-12-25 |
Family
ID=43125468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP10744908.4A Not-in-force EP2484183B1 (de) | 2009-09-29 | 2010-08-12 | Elektronisches vorschaltgerät und verfahren zum betreiben mindestens einer entladungslampe |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8994285B2 (de) |
| EP (1) | EP2484183B1 (de) |
| CN (1) | CN102577626B (de) |
| DE (1) | DE102009043611A1 (de) |
| WO (1) | WO2011038974A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8947893B2 (en) * | 2010-11-11 | 2015-02-03 | Fairchild Korea Semiconductor Ltd. | Switch controller and converter including the same for prevention of damage |
| DE102016124116A1 (de) * | 2016-12-12 | 2018-06-14 | Sml Verwaltungs Gmbh | Vorrichtung zur Ansteuerung einer Strahlungsquelle zum Aushärten von Auskleidungsschläuchen |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5604411A (en) * | 1995-03-31 | 1997-02-18 | Philips Electronics North America Corporation | Electronic ballast having a triac dimming filter with preconditioner offset control |
| CN1179077A (zh) * | 1996-09-19 | 1998-04-15 | 通用电气公司 | 高压集成电路驱动半桥气体放电灯镇流器 |
| US5925990A (en) * | 1997-12-19 | 1999-07-20 | Energy Savings, Inc. | Microprocessor controlled electronic ballast |
| US6466456B2 (en) * | 1999-12-18 | 2002-10-15 | Koninklijke Philips Electronics N.V. | Converter with resonant circuit elements for determing load type |
| DE60122173T2 (de) * | 2000-08-28 | 2007-06-28 | Koninklijke Philips Electronics N.V. | Schaltung |
| EP1423915A1 (de) * | 2001-08-28 | 2004-06-02 | Koninklijke Philips Electronics N.V. | Halbbrückenschaltung |
| DE102006022819A1 (de) * | 2005-05-23 | 2007-01-04 | Infineon Technologies Ag | Schaltungsanordnung zum Versorgen einer Last mit einem Ausgangsstrom |
| JP2008159382A (ja) * | 2006-12-22 | 2008-07-10 | Koito Mfg Co Ltd | 放電灯点灯回路 |
| DE102006061357B4 (de) * | 2006-12-22 | 2017-09-14 | Infineon Technologies Austria Ag | Verfahren zur Ansteuerung einer Leuchtstofflampe |
| EP2201669B1 (de) | 2007-09-18 | 2017-06-21 | Nxp B.V. | Steuerungsverfahren für einen halbbrücken-resonanzwandler zur vermeidung von kapazitivem betrieb |
-
2009
- 2009-09-29 DE DE200910043611 patent/DE102009043611A1/de not_active Withdrawn
-
2010
- 2010-08-12 EP EP10744908.4A patent/EP2484183B1/de not_active Not-in-force
- 2010-08-12 WO PCT/EP2010/061769 patent/WO2011038974A1/de not_active Ceased
- 2010-08-12 US US13/498,150 patent/US8994285B2/en not_active Expired - Fee Related
- 2010-08-12 CN CN201080043652.3A patent/CN102577626B/zh not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011038974A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102577626A (zh) | 2012-07-11 |
| EP2484183B1 (de) | 2013-12-25 |
| WO2011038974A1 (de) | 2011-04-07 |
| US20120181945A1 (en) | 2012-07-19 |
| US8994285B2 (en) | 2015-03-31 |
| CN102577626B (zh) | 2014-12-10 |
| DE102009043611A1 (de) | 2011-04-07 |
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