WO2010052630A1 - Circuit d'attaque de lampe - Google Patents

Circuit d'attaque de lampe Download PDF

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Publication number
WO2010052630A1
WO2010052630A1 PCT/IB2009/054850 IB2009054850W WO2010052630A1 WO 2010052630 A1 WO2010052630 A1 WO 2010052630A1 IB 2009054850 W IB2009054850 W IB 2009054850W WO 2010052630 A1 WO2010052630 A1 WO 2010052630A1
Authority
WO
WIPO (PCT)
Prior art keywords
lamp
mode
alternator
control unit
lamp driver
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.)
Ceased
Application number
PCT/IB2009/054850
Other languages
English (en)
Inventor
Dolf H. J. Van Casteren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of WO2010052630A1 publication Critical patent/WO2010052630A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H05B41/288—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 and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • 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
    • H05B41/288—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 and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2881—Load circuits; Control thereof
    • H05B41/2882—Load circuits; Control thereof the control resulting from an action on the static converter
    • H05B41/2883—Load circuits; Control thereof the control resulting from an action on the static converter the controlled element being a DC/AC converter in the final stage, e.g. by harmonic mode starting
    • 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
    • H05B41/288—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 and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2885—Static converters especially adapted therefor; Control thereof
    • H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
    • H05B41/2888—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage the bridge being commutated at low frequency, e.g. 1kHz
    • 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
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/382—Controlling the intensity of light during the transitional start-up phase
    • H05B41/388—Controlling the intensity of light during the transitional start-up phase for a transition from glow to arc

Definitions

  • the invention relates to a control unit for a lamp driver, and more specifically to a lamp driver for an ultra-high performance (UHP) light source, e.g. comprised in a projection system.
  • the control unit of the present invention is particularly useful in high pressure mercury (HPM) or high-intensity discharge (HID) lamps.
  • a lamp driver for a high-intensity discharge (HID) lamp is used to ignite the lamp by generating a high voltage. After the lamp is ignited, the lamp is slowly warmed up by a limited current. When the lamp has reached its full power, it changes to power control keeping the lamp power constant. To realize this, a number of modes are defined within the lamp driver. These modes are:
  • ignition mode including take-over phase (lamp is ignited by generating a high voltage); 2. run-up mode (lamp is warming up by a limited current); and
  • WO2006/011113 discloses a control unit for a lamp driver which provides a smooth transition between various operation modes of the lamp driver, in particular between ignition mode and run-up mode, by comprising means for providing, initially in an ignition mode, a predetermined start value of current to the lamp, and means for, subsequently in the ignition mode, increasing the provided current to a predetermined maximum value.
  • WO2006/011113 also discloses a control unit for a lamp driver in which the switching behavior is improved in run-up mode.
  • the lamp driver comprises a down- convertor and an alternator (also referred to as a Full Bridge Commutating Forward (FBCF) topology) to provide a voltage and/or a current to a lamp, wherein the control unit is adapted to control the alternator to maintain running at high frequency during run-up mode, and to cause the frequency to decrease when a measured lamp voltage is equal to a predetermined value.
  • FBCF Full Bridge Commutating Forward
  • the lamp current in principle has a substantially constant magnitude, but the lamp current changes direction at regular intervals by switching both the down-convertor and the alternator.
  • a full lamp period comprises a first time interval wherein the lamp current has one direction, and a second time interval wherein the lamp current has the reverse direction. Changing from one direction to the other is also called “commutation”.
  • a disadvantage of lamp drivers having a FBCF topology is that they lack a smooth commutation process and show a hard switching behavior in steady-state mode. This has a negative influence on the efficiency of the lamp driver, especially as the steady- state mode is the mode in which the lamp is driven most of the time.
  • a control unit for a lamp driver being arranged to control the operation of a lamp during at least an ignition mode, a run-up mode and a steady-state mode, the lamp driver comprising a down-convertor and an alternator being connectable to the lamp, said alternator providing a voltage to the lamp to ignite the lamp during the ignition mode, and said down-convertor providing a current to the lamp during at least the run-up mode and the steady-state mode, wherein the control unit is arranged to control the alternator in buck converter mode during steady-state mode to provide a substantially constant voltage to the alternator side of the lamp driver.
  • a diode is present in the circuit and it is an internal body diode associated with for instance a MOSFET switch, this internal body diode behaves badly at relatively high frequencies, especially at the transition from the conductive state to the non-conductive state, which causes relatively much loss of energy. Even if separate diodes are used, the diodes contribute to energy losses when its corresponding switch is actively switching.
  • the alternator provides the substantially constant voltage at the alternator side by continuously operating in buck converter mode, the bad switching behavior of diodes that may be present in the alternator can be circumvented, and zero voltage switching can be achieved, thereby resulting in an improved switching behavior of the alternator and in an overall increased circuit efficiency.
  • FBCF Full Bridge Commutating Forward
  • HBCF Half Bridge Commutating Forward
  • the continuous operation of the down-convertor in buck convertor mode in combination with the substantially constant voltage at the alternator side, which is preferably half the supply voltage to the lamp driver, allows to commutate the lamp current without changing the switching mode. Commutation can then be achieved by changing the duty-cycle of the down-convertor, which results in a smooth commutation process comparable with a HBCF topology.
  • control unit comprises a feedback loop to control the alternator in buck convertor mode.
  • the control unit therefore monitors the voltage at the alternator side of the lamp driver and provides appropriate control signals to the alternator to provide a substantially constant voltage at the alternator side. In this way a stable voltage can be provided at the alternator side, thereby improving the commutation of the lamp current.
  • control unit is further adapted to bring the alternator in buck convertor mode during run-up mode to provide a substantially constant voltage to the alternator side of the lamp driver.
  • the alternator is in buck convertor mode during run-up mode
  • the previous mentioned advantages during steady-state mode also apply for run-up mode, which results in an improved switching behavior of the alternator and thereby in a further increased overall circuit efficiency. It also provides for a smooth transition from run-up mode to steady state mode.
  • the control unit may advantageously be implemented in a lamp driver, which may in turn be inserted in a projection system, which also comprises an ultra-high performance (UHP) light source.
  • UHP ultra-high performance
  • the UHP light source may, e.g., be a high pressure mercury (HPM) or a high- intensity discharge (HID) lamp.
  • the lamp driver may be implemented in an illumination system, a luminaire or a display system, e.g. a projection display system.
  • a display system comprising a lamp driver as described may also be employed in a direct view LCD system.
  • the control unit and/or the lamp driver may be used in any other suitable apparatus.
  • Figure 1 depicts a circuit diagram for a lamp driver including a control unit according to the invention.
  • Figure 1 depicts a control unit CU for a lamp driver being adapted to control the operation of a lamp La during at least an ignition mode, a run-up mode and a steady- state mode
  • the lamp driver comprising a down-convertor and an alternator being connectable to the lamp La, said alternator providing a voltage to the lamp La to ignite the lamp La during ignition mode, and said down-convertor providing a current to the lamp La during at least run-up mode and steady-state mode
  • the control unit is adapted to bring the alternator in buck converter mode during steady-state mode to provide a substantially constant voltage to the alternator side of the lamp driver.
  • the down-convertor comprises a first capacitor Cl, a first inductive coil Ll, a first switch Sl and corresponding diode Dl, and a second switch S2 and corresponding diode D2.
  • the duty cycle of the down-convertor determines the output current, which is the current through inductive coil Ll.
  • the alternator comprises a second capacitor C2, a second inductive coil L2, a third switch S3 and a corresponding diode D3, and a fourth switch S4 and corresponding diode D4.
  • a DC supply voltage is supplied to the lamp driver through input terminals Kl and K2.
  • the switches and corresponding diodes can be provided as single elements, but it is also possible that they are provided as a combination, such as for instance a MOSFET switch, which already has an internal body diode similar to the diodes drawn in this circuit diagram.
  • the lamp La is connected to the down-convertor by output terminal K3, also referred to as the down-convertor side of the lamp driver.
  • the lamp La is connected to the alternator by output terminal K4, also referred to as the alternator side of the lamp driver.
  • the voltage at output terminal K4 is in principle equal to the voltage at input terminal K2, thereby the voltage applied to the lamp La is equal to the voltage applied at capacitor Cl minus the voltage applied at input terminal K2.
  • the voltage at input terminal K2 is zero, making the voltage applied to the lamp La equal to the voltage applied to the capacitor Cl .
  • the third switch S3 is conducting, the voltage applied to the lamp is in principle equal to the supply voltage minus the voltage applied at capacitor Cl .
  • the main function of the alternator is to generate the ignition voltage to ignite the lamp La during the ignition mode.
  • the alternator is switching in a high frequency mode, preferably with a frequency which is larger than 100 kHz.
  • Capacitor C2 and inductive coil L2 together form a resonant circuit.
  • the alternator When the alternator is switching in a high frequency mode relatively close to a resonance frequency of the resonant circuit, it will generate a voltage that is able to ignite the lamp La.
  • the down-convertor switches Sl and S2 may be non-conducting, or one of the switches Sl or S2 is made conducting and the other one is not.
  • the down-convertor may also be switching in order to control a lamp current when the lamp La ignites.
  • the advantage of the latter is that the lamp current is immediately available when the lamp La ignites.
  • the down-convertor first realizes a relatively low current through the lamp when the lamp is ignited and subsequently, during ignition mode, increases the lamp current, preferably linearly, to a maximum value. This ensures that the lamp starts up smoothly and even warms up already in ignition mode. After ignition mode, the run-up mode follows and various switching patterns are possible. It is possible that the alternator will decrease its switching frequency from the high frequency to a relatively low frequency. In a variant, the alternator is kept switching at a relatively high frequency.
  • the lamp driver After the run-up mode, the lamp driver will enter the steady-state mode and the control unit CU will bring the alternator in buck convertor mode to provide a substantially constant voltage at the alternator side.
  • the diodes D3 and D4 are internal body diodes of for instance a respective MOSFET switch, these diodes D3 and D4 behave badly at relatively high frequencies, especially at the transition from the conductive state to the non- conductive state, which causes relatively much loss of energy. Even if the diodes D3 and D4 are non-internal body diodes, they can contribute to energy losses when its associated switch is actively switching.
  • An advantage of operating the alternator in buck converter mode is that bad switching behavior of the diodes D3 and D4 can be avoided and zero voltage switching can be achieved, resulting in an improved switching behavior of the alternator and an increased circuit efficiency.
  • HBCF Half Bridge Commutating Forward
  • the present invention combines the advantages of the HBCF and FBCF topologies.
  • the FBCF topology has, amongst others, the advantage that no large buffer capacitors are required, and the HBCF topology may have, amongst others, a favorable switching behavior and a smooth commutation process.
  • the present invention combines the FBCF topology with the switching behavior of the HBCF topology.
  • the two switches of the respective alternator and down-convertor may be operated such that when one of the switches is conductive, the other switch is non-conductive and vice versa. Additionally, the switches can switch when a zero voltage/current is applied. This can be achieved by changing the duty cycle and/or the frequency of switching pattern, also referred to as transition mode operation of the switches.
  • the alternator is controlled to provide a substantially constant voltage
  • the down-convertor is controlled to provide a current to the lamp.
  • the down-convertor preferably comprises a current sensor to measure the lamp current or to measure when the lamp current is zero for zero current/voltage switching.
  • the substantially constant voltage at the alternator side is substantially half the supply voltage, thereby fully approximating the behavior of a HBCF topology.
  • the voltage at the alternator side being half the supply voltage has the advantage that the available power is substantially equally divided over both directions of the lamp current.
  • the steady-state mode is commonly the mode in which the lamp is driven most of the time and thus improving the circuit efficiency in steady-state mode has the most effect.
  • circuit efficiency can also be improved in run-up mode. This has the same advantages as for steady-state mode, and additionally allows a smooth transition between run-up mode and steady-state mode.
  • program, software application, and the like as used herein are defined as a sequence of instructions designed for execution on a computer system.
  • a program, computer program, or software application may include a subroutine, a function, a procedure, an object method, an object implementation, an executable application, an applet, a servlet, a source code, an object code, a shared library/dynamic load library and/or other sequence of instructions designed for execution on a computer system.
  • a computer program may be stored and/or distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.
  • a suitable medium such as an optical storage medium or a solid-state medium supplied together with or as part of other hardware, but also be distributed in other forms, such as via the Internet or other wired or wireless telecommunication systems.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

L'invention concerne un bloc de commande pour un circuit d'attaque de lampe conçu pour commander le fonctionnement d'une lampe au moins durant un mode d'amorçage, un mode de mise en température et un mode de régime permanent, le circuit d'attaque de lampe comprenant : un convertisseur abaisseur et un alternateur susceptibles d'être reliés à la lampe, ledit alternateur appliquant une tension aux bornes de la lampe pour amorcer celle-ci durant le mode d'amorçage, et ledit convertisseur abaisseur appliquant un courant à la lampe au moins durant le mode de mise en température et le mode de régime permanent, le bloc de commande étant conçu pour commander l'alternateur en mode convertisseur abaisseur de tension durant le mode de régime permanent pour fournir une tension sensiblement constante du côté alternateur du circuit d'attaque de lampe.
PCT/IB2009/054850 2008-11-07 2009-11-02 Circuit d'attaque de lampe Ceased WO2010052630A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08168540.6 2008-11-07
EP08168540 2008-11-07

Publications (1)

Publication Number Publication Date
WO2010052630A1 true WO2010052630A1 (fr) 2010-05-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/054850 Ceased WO2010052630A1 (fr) 2008-11-07 2009-11-02 Circuit d'attaque de lampe

Country Status (1)

Country Link
WO (1) WO2010052630A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102096292A (zh) * 2010-12-22 2011-06-15 苏州佳世达光电有限公司 投影机
WO2013141809A3 (fr) * 2012-03-23 2013-11-14 Nordic Light Ab Procédé et circuit d'attaque pour une lampe à décharge de gaz

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050062432A1 (en) * 2002-01-15 2005-03-24 Van Casteren Dolf Henricus Jozef Device and method for operating a discharge lamp
WO2006011113A1 (fr) * 2004-07-21 2006-02-02 Koninklijke Philips Electronics N.V. Unite de commande pour dispositif de commande de lampe permettant d'assurer une transition douce entre des modes de fonctionnement
US20070182344A1 (en) * 2004-07-21 2007-08-09 Koninklijke Philips Electronics, N.V. Lamp driver providing synchronization during commutation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050062432A1 (en) * 2002-01-15 2005-03-24 Van Casteren Dolf Henricus Jozef Device and method for operating a discharge lamp
WO2006011113A1 (fr) * 2004-07-21 2006-02-02 Koninklijke Philips Electronics N.V. Unite de commande pour dispositif de commande de lampe permettant d'assurer une transition douce entre des modes de fonctionnement
US20070182344A1 (en) * 2004-07-21 2007-08-09 Koninklijke Philips Electronics, N.V. Lamp driver providing synchronization during commutation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102096292A (zh) * 2010-12-22 2011-06-15 苏州佳世达光电有限公司 投影机
CN102096292B (zh) * 2010-12-22 2012-08-15 苏州佳世达光电有限公司 投影机
WO2013141809A3 (fr) * 2012-03-23 2013-11-14 Nordic Light Ab Procédé et circuit d'attaque pour une lampe à décharge de gaz

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