EP0941636A1 - Pumpstützdrossel - Google Patents
PumpstützdrosselInfo
- Publication number
- EP0941636A1 EP0941636A1 EP98933520A EP98933520A EP0941636A1 EP 0941636 A1 EP0941636 A1 EP 0941636A1 EP 98933520 A EP98933520 A EP 98933520A EP 98933520 A EP98933520 A EP 98933520A EP 0941636 A1 EP0941636 A1 EP 0941636A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pump
- capacitor
- branch
- circuit
- load
- 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
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
-
- 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
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S315/00—Electric lamp and discharge devices: systems
- Y10S315/07—Starting and control circuits for gas discharge lamp using transistors
Definitions
- the present invention relates to a circuit for operating a load, in particular an operating circuit for a low-pressure discharge lamp. It relates above all to an operating circuit in which a rectified AC supply voltage is used to operate a half-bridge oscillator as a frequency generator for lamp operation. The invention is nevertheless not restricted to a lamp as a load or to a half-bridge oscillator.
- the invention is based on a circuit for operating a load, in particular a low-pressure discharge lamp, with a frequency generator structure for alternating current supply to the load and a pump branch for improving the electromagnetic compatibility of the circuit, which structure connects the load circuit to a power supply side of the frequency generator .
- the circuit shown in FIG. 1 of EP 0 244 644 B1 is thus supplemented according to the invention by inserting a pump support choke on the rectified power supply side of the frequency generator structure, specifically on the power supply side before the connection point (M2) of the Pump branch.
- the formulation of the claim is to be understood in such a way that the pump support choke is discharged to very small coil current values in every area of a supply voltage or current period, ie also in the area of the maxima, in comparison to the coil current maximum.
- the current curve is a curve that oscillates back to zero or a very small value (with load circuit frequency), the amplitude being modulated with the time curve of the rectified (pulsating) power supply voltage.
- These current injection or charging processes of the pump support choke ensure optimal support of the pumping action of the pump branch in favor of improved electromagnetic compatibility. In particular, this also results in the advantage that the pump branch can be dimensioned smaller with regard to its impedance and thus can save costs.
- the position of the pump support choke in a “direct current range” means a position on the rectified side (pulsating direct current) of a rectifier structure in the case of mains or alternating current power supply, in contrast to pure smoothing chokes on the alternating current side.
- a significant further advantage for the operating properties of the circuit is based on the frequency dependence of the pumping action of the pump branch due to the increased number of pump cycles as the operating frequency increases. Conventionally, this increases the pumping action, which leads to difficulties for the operation of the circuit. In particular, an excessive pumping action can lead to excessive voltage increases on a storage element interacting with the pump branch, in general and also in the description below on a storage electrolytic capacitor (electrolytic capacitor). Such frequency increases occur, for example, when the load circuit is regulated via the frequency of the frequency generator, or as a result of other external influences. However, there is generally no increased consumption in the load circuit, which could counteract the voltage increase mentioned. Above all, in the frequency-increased preheating mode of a frequency-controlled discharge lamp load circuit or with another active power reduction in dimming mode, mains overvoltages, etc., the increased pumping action is even opposed to a reduced power consumption.
- the pumping action of the pump support throttle which decreases with increasing frequency and increases with decreasing frequency, counteracts the above effect and also supports the pumping action of the pump branch when the frequency drops, at which e.g. when approaching a resonance of the load circuit (frequency-controlled discharge lamp) the demand for power can increase.
- a preferred application is a half-bridge oscillator with two switching elements, such as field effect or bipolar transistors, which oscillate the potential of a center tap between two branches of a rectified power supply.
- the details of starting devices and frequency controls of such half-bridge oscillators are known in the art and are known to the person skilled in the art. You will the not described.
- the load circuit frequency-controlled half-bridge oscillators represent application circuits in which the invention can be used particularly effectively.
- the pump branch can be connected on the power supply side between two diodes in a power supply branch. These diodes are polarized in the forward direction in the sense of the current flow of the power supply and thus fulfill the function of a valve for the pump branch, so to speak. That they connect the pump branch to charge it with the power supply and to discharge it with the frequency generator or a storage element thereof.
- This valve function can, at least in part, also be implemented in a different way than with the diodes described.
- the diode on the power supply side can be replaced by the action of a rectifier, for example a diode bridge.
- the diodes described represent an advantageous embodiment in many cases. Due to the fact that a diode lies between the pump support choke and the frequency generator and the pump branch is connected between the pump support choke and the diode, the invention can be further improved in that the pump branch is connected to a connection on the other side of this diode via a bypass capacitor, that is to say the diode is bypassed by the bypass capacitor.
- a trapezoidal capacitor is used in the prior art to dampen the potential jumps in the potential generated by the frequency generator, that is to say, for example, the center tap potential of a half-bridge oscillator.
- the pump branch is only connected to the load circuit via a capacitor.
- a lamp coil (resonance choke) is generally provided in the load circuit.
- the pump branch can be connected in different ways relative to this coil.
- two or more pump branches can also be present, each of which can act differently on the load circuit.
- a damping effect for current peaks from the pump branch results if, instead of a connection on the load side with respect to the lamp coil, an intermediate tap of the lamp coil is used, so that part of the lamp coil acts as a damping choke for high-frequency current components. This naturally also applies to two or more connection points of the branch or branches on the load circuit.
- the pump branch can be connected to the load circuit via two parallel capacitors, one of which is located at the intermediate tap mentioned and the other on the frequency generator side of the coil.
- the current peak damping described makes particular sense if the alternating current in the load circuit is detected for technical signal utilization, for example via a resistor.
- bypass capacitor already mentioned can be connected, for example, to two diodes and a further capacitor in such a way that the latter capacitor is charged by the charging or discharging current of the bypass capacitor.
- a control device for the frequency generator for example an integrated control circuit for the half-bridge oscillator, can then be supplied from the latter capacitor.
- FIGS. 1 to 5 each show their own exemplary embodiments which differ from one another with regard to the arrangement and structure of the pump branch.
- the dashed lines serve to illustrate advantages according to the invention, but are not part of the exemplary embodiments.
- the basic function of the half-bridge oscillator is that the potential of the center tap M1 is shifted back and forth between that of the positive supply branch and that of the negative supply branch by alternating switching actuation of switches S1 and S2. This results, so to speak, in a “chopper oscillation”, which is used for AC operation of the load circuit with the low-pressure discharge lamp E and, via the operating frequency of the half-bridge oscillator, for regulating the operating state of the low-pressure discharge lamp E.
- This basic circuit is generally known, so that further details can be found in the cited state the technology and the references to be found there.
- the pump branch connects the high-frequency alternating voltage from the load circuit supplied via the capacitors C2 and C3 depending on the difference between the supply input voltage U N (t) and the voltage at the electrolytic capacitor alternating half-wave (with regard to the load circuit frequency) with one or the other of the two voltages mentioned on the power supply side of the half-bridge oscillator.
- the charge shift through the pump branch in particular reduces the sharpness of the charge absorption by the electrolytic capacitor, which would otherwise suddenly start or stop if the electrolytic voltage is equal to the current supply voltage.
- strong, lower harmonic harmonics of the mains frequency would result, which, for example, can practically not be filtered out with smoothing chokes on the AC side.
- the diode D2 is also bridged with the bypass capacitor Cl, so that with increasing frequency due to the decreasing AC resistance of the capacitor Cl more and more pumping back and forth of charge between the electrolytic capacitor and the load circuit in place of an additional charge absorption from the power supply occurs.
- bypass capacitor Cl acts in series with the
- FIG. 5 shows a possibility of giving the bypass capacitor Cl according to the invention a further advantageous function. It is connected to a capacitor C6 via two diodes D5 and D6. The circuit consisting of the diodes and the capacitor C6 replaces the connection point of the bypass capacitor C1 on the branch of the power supply - cf. Fig. 2.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
- Rectifiers (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19725645A DE19725645A1 (de) | 1997-06-18 | 1997-06-18 | Pumpstützdrossel |
DE19725645 | 1997-06-18 | ||
PCT/DE1998/001328 WO1998058526A1 (de) | 1997-06-18 | 1998-05-13 | Pumpstützdrossel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0941636A1 true EP0941636A1 (de) | 1999-09-15 |
EP0941636B1 EP0941636B1 (de) | 2002-08-14 |
Family
ID=7832771
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98933520A Expired - Lifetime EP0941636B1 (de) | 1997-06-18 | 1998-05-13 | Schaltung mit Pumpstützdrossel, zur Verbesserung des Leistungsfaktors |
Country Status (9)
Country | Link |
---|---|
US (1) | US6091207A (de) |
EP (1) | EP0941636B1 (de) |
JP (1) | JP3338068B2 (de) |
KR (1) | KR100431670B1 (de) |
CN (1) | CN1235448C (de) |
AU (1) | AU741384B2 (de) |
CA (1) | CA2263696C (de) |
DE (2) | DE19725645A1 (de) |
WO (1) | WO1998058526A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19963282A1 (de) * | 1999-12-27 | 2001-06-28 | Tridonic Bauelemente | Elektronisches Vorschaltgerät zum Betrieb einer Niederdruck-Entladungslampe |
US6337800B1 (en) * | 2000-02-29 | 2002-01-08 | Philips Electronics North American Corporation | Electronic ballast with inductive power feedback |
CN1265538C (zh) * | 2000-10-24 | 2006-07-19 | 皇家菲利浦电子有限公司 | 具有降低的功耗的便携式装置 |
NL1040339C2 (nl) * | 2013-08-19 | 2015-02-23 | Ndf Special Light Products B V | Elektrische inrichting voor het ontsteken en voeden van een koude kathode fluorescentielamp. |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4075476A (en) * | 1976-12-20 | 1978-02-21 | Gte Sylvania Incorporated | Sinusoidal wave oscillator ballast circuit |
US4396866A (en) * | 1980-12-29 | 1983-08-02 | Gte Products Corporation | Lamp filament drive scheme providing for control of filament voltages by use of lamp current in solid state ballasts |
US4563719A (en) * | 1982-08-30 | 1986-01-07 | Nilssen Ole K | Ballasts with built-in ground-fault protection |
DE3611611A1 (de) * | 1986-04-07 | 1987-10-08 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum hochfrequenten betrieb einer niederdruckentladungslampe |
DE3623749A1 (de) * | 1986-07-14 | 1988-01-21 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum betrieb von niederdruckentladungslampen |
DE3841227A1 (de) * | 1988-12-07 | 1990-06-13 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zum betrieb einer niederdruckentladungslampe |
US6118225A (en) * | 1994-08-22 | 2000-09-12 | U.S. Philips Corporation | High frequency discharge lamp operating circuit with resonant power factor correction circuit |
US5488269A (en) * | 1995-02-10 | 1996-01-30 | General Electric Company | Multi-resonant boost high power factor circuit |
TW296894U (en) * | 1995-11-21 | 1997-01-21 | Philips Electronics Nv | Circuit arrangement |
DE19619581A1 (de) * | 1996-05-15 | 1997-11-20 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Hochfrequenzbetriebsschaltung für eine Niederdruckentladungslampe mit verbesserter elektromagnetischer Verträglichkeit |
-
1997
- 1997-06-18 DE DE19725645A patent/DE19725645A1/de not_active Withdrawn
-
1998
- 1998-05-13 CN CNB988008599A patent/CN1235448C/zh not_active Expired - Lifetime
- 1998-05-13 EP EP98933520A patent/EP0941636B1/de not_active Expired - Lifetime
- 1998-05-13 JP JP50352799A patent/JP3338068B2/ja not_active Expired - Fee Related
- 1998-05-13 US US09/242,468 patent/US6091207A/en not_active Expired - Lifetime
- 1998-05-13 KR KR10-1999-7001292A patent/KR100431670B1/ko not_active IP Right Cessation
- 1998-05-13 DE DE59805182T patent/DE59805182D1/de not_active Expired - Lifetime
- 1998-05-13 CA CA002263696A patent/CA2263696C/en not_active Expired - Fee Related
- 1998-05-13 AU AU83321/98A patent/AU741384B2/en not_active Ceased
- 1998-05-13 WO PCT/DE1998/001328 patent/WO1998058526A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO9858526A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU741384B2 (en) | 2001-11-29 |
JP2000501565A (ja) | 2000-02-08 |
DE59805182D1 (de) | 2002-09-19 |
CA2263696C (en) | 2006-01-10 |
AU8332198A (en) | 1999-01-04 |
CN1235448C (zh) | 2006-01-04 |
JP3338068B2 (ja) | 2002-10-28 |
CN1229569A (zh) | 1999-09-22 |
EP0941636B1 (de) | 2002-08-14 |
WO1998058526A1 (de) | 1998-12-23 |
KR20000068179A (ko) | 2000-11-25 |
DE19725645A1 (de) | 1998-12-24 |
KR100431670B1 (ko) | 2004-05-17 |
US6091207A (en) | 2000-07-18 |
CA2263696A1 (en) | 1998-12-23 |
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