CN101080953A - Hf gas discharge lamp circuit - Google Patents

Hf gas discharge lamp circuit Download PDF

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Publication number
CN101080953A
CN101080953A CNA2005800429622A CN200580042962A CN101080953A CN 101080953 A CN101080953 A CN 101080953A CN A2005800429622 A CNA2005800429622 A CN A2005800429622A CN 200580042962 A CN200580042962 A CN 200580042962A CN 101080953 A CN101080953 A CN 101080953A
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CN
China
Prior art keywords
lamp
circuit
direct voltage
impedance
capacitor
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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.)
Pending
Application number
CNA2005800429622A
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Chinese (zh)
Inventor
T·乌斯特巴恩
R·范霍恩肖滕
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Publication of CN101080953A publication Critical patent/CN101080953A/en
Pending legal-status Critical Current

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    • 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
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • 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
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

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  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

A lamp circuit comprising a series circuit of an alternating voltage (AC) supply source (2) for supplying an AC voltage having a high lamp-operating frequency, a ballast inductor (4), a capacitor (6) and terminals for connection to a gas discharge lamp (8), and, connected to said terminals, an ignition circuit for igniting the lamp (8). The capacitor (6) has a value which represents a low impedance for the lamp-operating frequency. The ignition circuit comprises a series arrangement of an impedance (10, 14) and a direct- voltage (DC) source (12) for supplying a high DC voltage. The series impedance (10, 14) of the ignition circuit has a value which is high with respect to an impedance value of the lamp (8) during run-up and during steady-state operation of the lamp (8).

Description

Hf gas discharge lamp circuit
Technical field
The present invention relates to circuit for lamp a kind of as that in the preamble of claim 1, describe.
Background technology
At US4, such gas discharge lamp circuit is disclosed in 959,593.In this circuit for lamp, alternating voltage (AC) power supply is mains supply (mains), so the operation frequency value of lamp is very low, and for example 50 hertz or 60 hertz.The inductor and the capacitor that are connected in series with lamp all are the parts of ballast circuit.Therefore, capacitor has the value of the effective impedance of having represented the lamp frequency of operation.Firing circuit and lamp are connected in parallel.Firing circuit comprises the cascaded structure of two networks of resistor and capacitor, voltage-dependent device and possible inductor.Voltage-dependent device can be an ovonic switch, for example two-way trigger device.When circuit for lamp was connected, firing circuit produced ring (on/off) voltage.Ringing voltage makes the power supply distortion by AC power, and produces the high voltagehigh frequency firing pulse at the two ends of lamp, makes the lamp igniting.
Because the ring process must take place, thus must provide tuning, thus make the proper operation of the ignition device of the above-mentioned type will depend on the technical specification of ballast and coupled lamp.This has increased burden just for design and logistic work thereof.In addition, the technical specification of said technical specification, especially lamp, therefore possible time to time change and change with variation of temperature may influence the operation of ignition device.
Other conventional high-intensity discharge (HID) lamp provides the square wave current of 50 hertz to 500 hertz low lamp frequency of operation usually.The igniting of this lamp is to realize by stack high tension ignition pulse on the low-frequency voltage that provides to lamp.Therefore pulse transformer will be connected in series with lamp, so that the lamp supply voltage of low frequency is induced such firing pulse.When such circuit was used for high lamp frequency of operation (for example megahertz scope), such transformer just showed a high impedance, and this impedance has influenced normal lamp operation significantly.And a kind of like this resistance of transformer will cause energy loss.
Goal of the invention
The objective of the invention is to overcome the above-mentioned shortcoming of prior art.
Summary of the invention
The objective of the invention is to realize by the circuit for lamp that provides claim 1 to limit.
The effect of capacitor is a device that intercepts direct current.Capacitor destroys the DC current path between lamp and the AC power.Therefore capacitor can prevent that direct current from passing through AC power.In this way, can set up high direct voltage at the two ends of lamp.This high direct voltage causes the igniting of lamp.Capacitor can have quite low impedance for the a-c cycle of high frequency, and in this case, capacitor is not the vitals in the ballast function.In another embodiment, capacitor can have quite high impedance, represents the live part of ballast.
When the turn-on lamp circuit, lamp does not have conducting, expresses high impedance.In the quite short time (being generally 10 milliseconds), direct voltage source is given said capacitor charging, produces high voltage at the two ends of lamp whereby, makes the lamp igniting.After igniting, lamp shows extremely low impedance.As a result, stable high frequency electric source electric current can flow through lamp from AC power.The resistance of the resistor that is connected in series with high-voltage DC power supply is enough to the alternating current of restricted passage DC power supply.This alternating current limitation function can also be finished by an inductor, and this inductor has constituted a similar impedance (similar impedance) for a-c cycle.
Test shows, the amplitude of direct voltage can be more much smaller than the amplitude of the firing pulse of the said lamp of igniting that uses in the prior art.Result than low amplitude is that circuit for lamp must satisfy the condition of the lower easier acquisition of security level.In addition, lower amplitude has reduced the requirement for insulation, and allows the size of circuit for lamp less.
Description of drawings
From the description by means of example with reference to the accompanying drawings, the present invention will be conspicuous.In the accompanying drawings:
Fig. 1 represents the schematic diagram according to first embodiment of gas discharge lamp circuit of the present invention;
Fig. 2 represents the schematic diagram according to second embodiment of gas discharge lamp circuit of the present invention.
Embodiment
Fig. 1 represents that according to gas discharge lamp circuit of the present invention said circuit comprises a high-frequency power supply 2.Inductor 4, capacitor 6 and gaseous discharge lamp 8 are connected in series with said high frequency electric source 2.
High frequency electric source 2 for example can be half-bridge, full-bridge and E class direct-current-alternating-current converter, comprises alternately switching on and off so that some switches of alternating voltage basically to be provided.
The series circuit and the lamp 8 of resistor 10 and direct voltage (DC) power supply 12 are connected in parallel.
Above-mentioned entity and parts for example have following numerical value.
High frequency voltage source 2:400 volt, 2 megahertzes
Inductor 4:40 μ H
Capacitor 6:220pF
Lamp 8: convergence infinity when misfiring is 60 Ω during igniting
Resistor 10:50M Ω
Direct voltage source 12:15 kilovolt
From above example obviously as can be seen, capacitor has the rated value and the electric capacity of suitable maximum voltage.
If ballast will for example operated under 100 hertz the low frequency, then the value of capacitor should for 4.4 μ H to reach a similar impedance.At 15 kilovolts voltage rating, such capacitor can become excessive.Calculate fast and show that under the situation of such large capacitor, the power demand rated value of direct voltage source is excessive, does not conform to reality:
For I=C*dV/dt and above-mentioned numerical value,
I=4.4*10 -6* 15*10 3/ 10 -2=6.6 amperes.
This can produce the peak power rated value of direct voltage source again:
P=6.6*15*10 3=99 kilovolt-amperes.
And then if capacitor has so sizable electric capacity, the energy of storing in the capacitor will destroy the electrode of lamp when igniting.The energy of this storage may be:
Q=C*V 2, so that
Q=4.4*10 -6* (15*10 3) 2=99 Jiao Er (J).
From the above obviously as can be seen, the present invention relates in particular to the circuit with quite high frequency of operation.Compare with the low frequency ballast, such circuit with high lamp current frequency has tangible advantage aspect cost and the size.In some cases, the character of lamp for example effect must be subjected to the influence of high frequency of operation.Be exactly this situation for example for fluorescent lamp.
From above-described example as can be seen, also not having at lamp 8 does not promptly also have under the situation of conducting under the situation of igniting, and when the turn-on lamp circuit, DC power supply 12 will make capacitor 6 chargings, produce high voltage at the two ends of lamp 8 thus.Certain time point between capacitor 6 charge period, the voltage at lamp 8 two ends will make lamp 8 puncture, i.e. lamp 8 igniting and conduction.Make the resistance value of lamp 8 compare minimum with the resistance of resistor 10.Therefore, in lamp 8 two ends direct voltages disappearances (collapse).And then, because lamp 8 igniting, so high-frequency current flows through lamp 8.
From the above as can be seen, the said series circuit of resistor 10 and DC power supply 12 is added capacitor 6, operate as a firing circuit or igniter, this firing circuit be simple, energy efficiency is high and it is undersized to be.
Second embodiment according to gas discharge lamp circuit of the present invention comprises an inductor 14, and this inductor 14 replaces resistor 10.For a-c cycle, the impedance comparability of impedance that inductor 14 provides and resistor 10 is intended.
In order further to reduce energy consumption, also comprise a control circuit 16 at the firing circuit of second embodiment shown in Fig. 2.When control circuit was connected, control circuit allowed the igniter operation.After lamp 8 igniting, forbid the igniter operation, there is not direct current to flow through direct voltage source 12 and resistor 10.Therefore, during the normal running of lamp 8, do not consume direct current power from direct voltage source 12.
Control circuit 16 can comprise a timer, forbids the operation of direct voltage source after being used for for example beginning the several milliseconds of process from the time that direct current begins to flow.This just illustrates that this embodiment is a simple and inexpensive, especially for the technical specification of lamp and over time situation be all the more so under the known in advance situation.Automotive lighting field with xenon lamp is exactly an example of this situation.
Control circuit 16 can also comprise a transducer or detector or testing circuit, and it generally is used to detect the starting of lamp 8 or the stable state that lamp 8 is operated, and is referred to as normal running usually.Testing circuit can comprise photodetector, is used to detect the light that lamp 8 sends.Testing circuit can also comprise ac detector, is used to detect the alternating current that flows through lamp.And testing circuit can also comprise a DC detector, is used to detect the direct current that flows through lamp 8 and/or flow through resistor 10.When detecting such interchange and/or direct current, control circuit 16 can be controlled direct voltage source, and direct voltage source is not worked.
Utilization shows according to the test that circuit for lamp of the present invention carries out, and is provided by dc source 12 DC voltage is compared with the firing pulse that uses in the circuit for lamp of prior art, and amplitude significantly Low. Its advantage is to satisfy easily the requirement of insulation, and/or can use between the littler conductor Distance. Can also make circuit for lamp satisfy the requirement of different level of securitys, required effort with become This is less.
Test also shows to have the small inductor value with being used in according to firing circuit of the present invention The circuit for lamp of inductor 4 in, still can keep above-mentioned advantage simultaneously.

Claims (6)

1, a kind of circuit for lamp, comprise alternating voltage (AC) power supply (2) that is used to provide alternating voltage with high lamp frequency of operation, ballast inductance device (4), capacitor (6) and being used to is connected to the series circuit of the terminal of gaseous discharge lamp (8), and be connected to said terminal be used to light a fire a firing circuit of said lamp, it is characterized in that: the frequency of alternating voltage (AC) power supply (2) has the high value greater than ten KHz, and firing circuit comprises the impedance (10 of connecting with direct voltage (DC) source (12) of the direct voltage that is used to provide high, 14), so that when a-c cycle the resistance value of firing circuit greater than lamp (8) during starts and the resistance value of the lamp during the steady state operation of lamp (8) (8).
2, circuit for lamp according to claim 1, it is characterized in that: the resistance value of firing circuit is between 100 and 100000000 when a-c cycle, preferably between 10000 and 10000000, with lamp (8) during starts and the resistance value of the lamp (8) during the steady state operation of lamp (8) the same high.
3, circuit for lamp according to claim 1 and 2 is characterized in that: the impedance of connecting with the direct voltage source (12) of firing circuit is provided by inductor (14).
4, according to claim 1,2 or 3 described circuit for lamp, it is characterized in that: firing circuit further comprises a control circuit (16), is used for forbidding after lamp (8) igniting the operation of direct voltage source (12).
5, circuit for lamp according to claim 4 is characterized in that: control circuit (16) comprises a timer, is used for forbidding the direct voltage source operation after permission direct voltage source operation beginning predetermined time interval is overtime.
6, according to claim 1,2 or 3 described circuit for lamp, it is characterized in that: direct voltage source comprises a current limiting element, is used to limit the output current of DC power supply.
CNA2005800429622A 2004-12-14 2005-12-06 Hf gas discharge lamp circuit Pending CN101080953A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04106567 2004-12-14
EP04106567.3 2004-12-14

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CN101080953A true CN101080953A (en) 2007-11-28

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CNA2005800429622A Pending CN101080953A (en) 2004-12-14 2005-12-06 Hf gas discharge lamp circuit

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EP (1) EP1829431A1 (en)
JP (1) JP2008523573A (en)
CN (1) CN101080953A (en)
WO (1) WO2006064408A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010028222A1 (en) 2010-04-27 2011-10-27 Osram Gesellschaft mit beschränkter Haftung Method for operating a gas discharge lamp and gas discharge lamp system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0411617A3 (en) * 1989-08-01 1992-05-13 Toshiba Lighting & Technology Corporation Method of lighting discharge lamp and discharge lamp lighting apparatus
DE4127970C1 (en) * 1991-08-23 1992-10-01 Robert Bosch Gmbh, 7000 Stuttgart, De

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EP1829431A1 (en) 2007-09-05
WO2006064408A1 (en) 2006-06-22
JP2008523573A (en) 2008-07-03

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Open date: 20071128