CN1179077A - High voltage integrated circuit driven semibridge gas discharge lamp ballast - Google Patents
High voltage integrated circuit driven semibridge gas discharge lamp ballast Download PDFInfo
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- CN1179077A CN1179077A CN 97118697 CN97118697A CN1179077A CN 1179077 A CN1179077 A CN 1179077A CN 97118697 CN97118697 CN 97118697 CN 97118697 A CN97118697 A CN 97118697A CN 1179077 A CN1179077 A CN 1179077A
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Abstract
A ballast circuit for a gas discharge lamp of the type including first and second resonant impedances whose values determine the operating frequency of the resonant load circuit. Further included is a d.c.-to-a.c. converter circuit. The converter includes first and second switches, and has a common node through which the a.c. load current flows. A feedback circuit provides a feedback signal indicating the level of current in the resonant load circuit. A high voltage IC drives the switches at a frequency determined by a timing signal. The switching frequency promotes resonant operation of the resonant load circuit. A circuit isolates the feedback signal from the timing signal for a predetermined period of time upon energizing of said converter circuit so as to allow the cathodes to become heated during such period of time, prior to lamp ignition.
Description
A first aspect of the present invention relates to the ballast circuit of gaseous discharge lamp, this circuit adopts high voltage integrated circuit (HVIC) to drive the tandem tap that a subtend lamp provides alternating current, more specifically to a kind of like this ballast circuit, this circuit provides feedback signal to HVIC, so that select suitable operating frequency at the lamp duration of work.A second aspect of the present invention relates to a kind of like this ballast circuit that comprises cathode preheat function.
A kind of ballast circuit of gaseous discharge lamp adopts a subtend lamp that the tandem tap of alternating current is provided, and they are arranged in resonant load circuit.Switch constitutes half-bridge D type inverter.Recently available various high voltage integrated circuits (HVIC) drive this half-bridge structure in the mode that replaces, and that is to say to make a switch conduction earlier, make it then to end, and make second switch conduction again, make it then to end, or the like.The advantage of this HVIC is to replace discrete circuit element, and cost is low, and the size of ballast is little.Yet this HVIC is designed to provide the fixing switching frequency of pair of switches.Though fixing frequency operation generally is suitable for the steady-working state of gaseous discharge lamp, but it is not suitable for the ignition operation of lamp, when point is lit a lamp, require the frequency of resonant load circuit to reach its intrinsic resonance frequency, be the point required very high voltage peak of lighting a lamp so that cause.
Therefore, according to a first aspect of the invention, need overcome the shortcoming of above-mentioned HVIC, make that when point was lit a lamp, the frequency of resonant load circuit reached its intrinsic resonance frequency, so that be produced as the required very high voltage peak of a little lighting a lamp.
According to a second aspect of the invention, need provide cathode preheat function to above-mentioned ballast circuit.
According to a first aspect of the invention, the ballast circuit that the purpose of this invention is to provide a kind of gaseous discharge lamp, this circuit comprises that a subtend lamp provides the tandem tap of alternating current, adopt HVIC to drive this, but the structure of this circuit make frequency is changed to the natural frequency of resonant load circuit to switch.
According to a second aspect of the invention, the ballast circuit that comprises cathode preheat function that the purpose of this invention is to provide a kind of the above-mentioned type.
According to a second aspect of the invention, the invention provides a kind of ballast circuit of the gaseous discharge lamp that comprises the resistance heating negative electrode of the above-mentioned type.Ballast circuit comprises the resonant load circuit that contains gaseous discharge lamp, has first and second resonance impedances, the operating frequency of the value decision resonant load circuit of resonance impedance.Comprise that also the direct current that links to each other with resonant load circuit becomes the converter that exchanges, so that in resonant load circuit, cause alternating current.Converter comprises the bus conductor that is connected in series in direct voltage and first and second switches between the ground, and has common node, AC load electric current this common node of flowing through.Feedback circuit provides the feedback signal of current amplitude in the expression resonant load circuit.Its frequency of high voltage integrated circuit that drives first and second switches is determined by the timing signal that mainly comprises the feedback signal during lamp is lighted, thereby feedback signal makes high voltage integrated circuit drive first and second switches during lamp is lighted, and its switching frequency causes resonant load circuit resonance.Spacer assembly is used for making when providing electric energy to converter circuit feedback signal and timing signal to isolate one period scheduled time, so that target heated in one period scheduled time before lamp is lighted.
By the description of doing below in conjunction with accompanying drawing, it is clearer that above and other objects of the present invention, advantage and feature will become, and identical reference number is represented identical part in the accompanying drawing, wherein:
Fig. 1 is the ballast circuit of gaseous discharge lamp according to a first aspect of the invention, and a part is the form of block diagram;
Fig. 2 is the figure that concerns between voltage-time of typical timing signal of timing input of the expression high voltage integrated circuit that is applied to Fig. 1;
Fig. 3 be indication lamp light and the modulating voltage-angular frequency of the working point of steady-working state between the schematic diagram that concerns;
Fig. 4 is the timing voltage of stable state lamp operation and the curve chart of relevant voltage-time;
Fig. 5 is similar to Fig. 4, but the voltage of indication lamp during lighting;
Fig. 6 is the ballast circuit of gaseous discharge lamp according to a second aspect of the invention, and a part is the form of block diagram; And
Fig. 7 is the schematic diagram of cathode preheat delay circuit 42, switch 40 and the interlock circuit of the ballast 10 ' of Fig. 6.
Is relevant to the description of the embodiment of Fig. 1 with explanation to Fig. 2-5, and the embodiment of Fig. 6 is the improvement to Fig. 1 embodiment, comprising cathode preheat function.
Fig. 1 represents the ballast circuit 10 of gaseous discharge lamp (for example fluorescent lamp) power supply is used R
LAMPExpression is because it presents impedance during operation.Ballast circuit 10 comprises the switch S 1 and the S2 of pair of series, power MOSFET for example, and they are connected between bus conductor 12 and the ground 14, receive dc bus voltage V
BUSControlled by 16 couples of switch S1 of high voltage integrated circuit (HVIC) and S2, this will describe in detail below.By alternately switching S1 and S2, node 18 alternately with bus voltage V
BUSLink to each other with ground 14.The resonant load circuit 20 that links to each other with node 18 comprises resonant inductance L
R, resonant capacitance C
RWith lamp R
LAMP21 pairs of load circuits 20 of electric capacity play a part every straight.Also comprise feedback resistance R
F, its purpose is discussed below.Owing to link to each other, so in resonant load circuit 20, caused alternating current with node 18.
HVIC 16 can comprise the half-bridge driver that has oscillator, and as the SGS-Thompson product sold, production number is L6569, and name is called " the high voltage half-bridge driver that has oscillator "; Perhaps by the international ballast company product sold of the EL Segundo in California, production number is IR2151, and name is called " self-oscillation half-bridge driver ".High and low voltage output 21A and 21B driving switch S1 and the S2 of HVIC 16.As conventional mode, timing resistor R
TBe connected electric capacity timing input 22 and resistance regularly between the input 24.Simultaneously, as conventional mode, timing capacitor C
TAn end and electric capacity regularly input 22 link to each other; Yet, timing capacitor C
TThe other end be not to connect in the usual way, this connection relates to the present invention's application to HVIC 16 in ballast circuit 10, so as during lamp to be lighted at lamp R
LAMPTwo ends produce high voltage peak (for example 1,000-1,200 volts).Therefore, from feedback resistance R
FThe feedback voltage V of upper end
FBe applied to timing capacitor C by lead 26
TThe lower end.On the contrary, Chang Gui way is with timing capacitor C
TThe direct ground connection in lower end, do not have feedback voltage V
FArrive the timing input 22 of HVIC 16.
Above-mentioned HVIC adopts regularly input 22, and this input receives timing signal V22, consequently the switching frequency of switch S 1 and S2 by timing signal V22 the transition number of times during from a threshold voltage to another threshold voltage or reverse situation determine.Therefore, with reference to Fig. 2, timing signal V22 can change between a pair of threshold voltage, as is applied to the supply voltage V on the HVIC of Fig. 1
S1/3 and supply voltage V
S2/3.Usually, when timing signal V22 is increased to high threshold from hanging down threshold value, timing resistor R
TThe upper end become with ground 26 and link to each other, so timing signal V22 is by timing resistor R
TDischarge.Similarly, when timing signal V22 becomes low threshold value, timing resistor R
TUpper end and supply voltage V
SLink to each other, timing signal V22 is increased to high threshold.At transition point t1, t2, t3 and the t4 among Fig. 2 for example, alternately make switch S 1 and S2 open and close.
Before lamp is lighted, lamp R
LAMPPresent high resistance.During this, the Q value of resonant load circuit 20 is very high, and this is because lamp does not provide low ohmic load to this circuit.During this, control switch S1 and S2 are so that make the operating frequency of resonant load circuit 20 reach its natural resonance point.When this situation occurring, the voltage at lamp two ends reaches and makes lamp light required very high peak value.
Fig. 3 is the graph of a relation between modulating voltage-angular frequency of representing to simplify, in order to the working condition of explanation lamp when lighting with stable state.Modulating voltage is measured with decibel, and angular frequency is measured with radian ω (promptly 2 π multiply by frequency).Angular frequency
2The working point of corresponding stable state is represented with 30, is in steady-state voltage V
SSYet, by angular frequency is dropped to ω
1, modulating voltage rises to V rapidly
IGNITIONAfter lamp was lighted, lamp presented quite low impedance, provided low-down impedance to resonant load circuit 20, had reduced its Q value, had caused lower steady-state voltage V
SS
By applying feedback signal V
FGive the timing input 22 of HVIC 16, required angular frequency during lamp is lighted, will occur and shift, obtain the required very high voltage peak of a little lighting a lamp.The timing signal V22 that Fig. 2 represents has the curve by index rising and decline of basic symmetry, and the situation that connects the timing input 22 of HVIC 16 with above-mentioned conventional state down has identical time constant.This causes the fixing operating frequency of lamp, and it is applicable to the steady-working state of lamp.Timing voltage V22 on the timing input 22 of HVIC 16 is as timing capacitor C
TWhen discharging and recharging from timing capacitor C
TVoltage with from feedback voltage V
FThe voltage sum.During the lamp steady-working state, because timing capacitor C
TDischarge and recharge feedback voltage V
FWith timing capacitor C
TVoltage compare very little.Therefore during the lamp steady-working state, timing voltage V22 is mainly by timing capacitor C
TDischarge and recharge decision.(yet in other embodiments, timing voltage is mainly controlled by feedback voltage during the lamp steady-working state.) Fig. 4 represents to produce the voltage sum of timing voltage V22.
In Fig. 4, solid line is represented timing voltage V22.Long dotted line 32 expressions are because timing capacitor C
TThe voltage that causes.Simultaneously, short dash line V
FRepresent very little feedback signal.Like this, during the lamp steady-working state, timing voltage V22 is mainly by timing capacitor C
TDischarge and recharge the voltage decision that causes.Referring now to Fig. 5, these voltages during lamp is lighted have wherein drawn.
With reference to Fig. 5, advantage of the present invention is when resonant load circuit 20 is unloaded by lamp substantially (lamp does not have low resistance during this period), has very high voltage (and electric current) during lamp is lighted in resonant load circuit 20.Therefore, during lamp is lighted, feedback signal V
FTo be much higher than during the lamp steady-working state.Though expression timing capacitor C
TSimilar when the curve 32 of charge condition seems with Fig. 4 stable state, but the timing voltage V22 among Fig. 5 rises so not soon.Its reason is, at the timing input 22 of HVIC 16, timing capacitor C
TVoltage and feedback voltage V
FThe inverse value addition.Yet for clarity, the feedback voltage V of having drawn among the figure
F, rather than its inverse value.With feedback voltage V
FInverse value and curve 32 additions, consequently greatly reduce the value of above-mentioned timing voltage V22.Such as top in conjunction with the accompanying drawings 2 discussion crosses, timing voltage V22 has prolonged the transit time from a threshold voltage to another threshold voltage.The operating frequency that is appreciated that HVIC 16 from Fig. 2 has reduced.This frequency drops to the natural resonance frequency ω 1 of resonant load circuit 20 from steady state operation frequencies omega 2 shown in Figure 3.This causes being the point required very high modulating voltage peak value of lighting a lamp.Yet, in case lamp is lighted the feedback voltage V in the resonant load circuit
FJust sharply descend with other voltage, therefore as top index map 4 was described, this feedback voltage at this moment had very important effect to timing voltage V22.Operating state during Fig. 3 medium frequency ω 3 will illustrate in conjunction with Fig. 6.
For 20 watts lamp, bus voltage V
BUSBe 170 volts, the canonical parameter of the element of ballast circuit 10 is among Fig. 1: resonant inductance L
RBe 800 microhenrys; Resonant capacitance C
RBe 5.6 nanofarads; Feedback resistance R
FIt is 3.3 ohm; Capacitance 21 is 0.22 microfarads; Timing resistor R
TBe 10.5 kilo-ohms, timing capacitor C
TIt is 0.001 microfarad.
Fig. 6 represents best ballast circuit 10 ' according to a second aspect of the invention.In Fig. 1 and Fig. 6, identical label is represented identical parts.Therefore, main description Fig. 6 is different from the part of Fig. 1 below.Specifically, the ballast circuit 10 ' of Fig. 6 comprises a pair of timing capacitor C
T1And C
T2, capacitor C
T2With capacitor C
T1Link to each other capacitor C
T2The bottom node link to each other with ground 14.Feedback voltage V
FCome from feedback resistance R
FThe node of non-ground connection, but just under the control of cathode preheat delay circuit 42, during conducting, just be added to capacitor C when switch 40
T1The bottom node on.Simultaneously, among lead 44A and the 44B and feedback resistance R
FLink to each other another omission.Preferably lead 44A is used for low relatively bus voltage V
BUS(for example 10 volts), lead 44B is used for high relatively bus voltage V
BUS(for example 300 volts).Lamp 48 has resistance heating negative electrode 48A and 48B, resonant capacitance C
R2Be connected across the negative electrode two ends.Above-mentioned parts will at length be described below.
Cathode preheat delay circuit 42 and timing capacitor C
T1And C
T2Acting in conjunction, target carries out preheating before lamp is lighted.During this, resistance heating negative electrode 48A and 48B are heated to a suitable temperature.The bus voltage V of suitable amplitude at first is being provided
BUSAfter, cathode preheat delay circuit 42 generally postpones an about second, makes switch 40 conductings then, with feedback voltage V
FBe added to timing capacitor C
T1The bottom node.Before switch 40 conductings, feedback voltage V
FVoltage V22 portion on the timing node 22 of HVIC16 is constituted influence.During this, the equivalent capacity between node 22 and the ground 14 is timing capacitor C
T1And C
T2Series value.For example, capacitor C
T1Be 1.0 nanofarads, capacitor C
T2Be 4.7 nanofarads, the series value of two electric capacity is 0.82 nanofarads.Therefore, the time constant of the voltage V22 among Fig. 2 will be less than the representative value in the ballast circuit 10 of above-mentioned Fig. 1, timing capacitor C among Fig. 1
TBe 1 nanofarad (0.001 microfarad).With reference to Fig. 3, operating frequency is ω
3, the cathode preheat modulating voltage is V
PH
After switch 40 conductings, timing capacitor C
T1The bottom node by timing capacitor C in parallel
T2With feedback resistance R
FGround connection.Yet, feedback resistance R
FTypical resistance value approximately is 1 ohm, well below timing capacitor C
T2Impedance, when switch 40 conductings, timing capacitor C
T2The bottom node can think it is direct ground connection 14 basically.Like this, the timing part R relevant among Fig. 6 with HVIC16
TAnd C
T1Be similar among Fig. 1 the timing resistor R relevant with HVIC 16
TWith timing capacitor C
TTherefore, the working condition of the ballast circuit 10 of the working condition of the ballast circuit 10 ' of the Fig. 6 during switch 40 conductings and above-mentioned Fig. 1 is similar.
The optimum implementation with the lower part of the ballast circuit 10 ' of Fig. 7 presentation graphs 6: cathode preheat delay circuit 42, switch 40, timing capacitor C
T1And C
T2, and feedback resistance R
FCircuit 42 comprises electric capacity 50, and it passes through resistance 52 by supply voltage V
S(Fig. 6) charging.The size of electric capacity 50 makes it not be subjected to feedback resistance R substantially
FOn the influence of alternating voltage; Compare with several volts during lamp is lighted, during cathode preheat, resistance R
FOn alternating voltage generally only be a few tenths of volt.Electric capacity 50 is charged to the breakdown point of Zener diode 54, makes switch 40 conductings.Switch 40 can comprise n channel enhancement MOSFET.Resistance 56 remains on the upper node 57 of switch 40 on the current potential on ground 14, so the intrinsic diode 58 not conductings of switch 40, has avoided timing capacitor C
T2Discharge, timing capacitor C
T2Discharge can influence the switch S 1 of ballast circuit 10 ' and the frequency of oscillation (Fig. 6) of S2.Simultaneously, resistance 59 avoids leakage current from the switch 40 of charging capacitor 50 and the conducting Zener diode 54 of flowing through.
For 25 watts lamp, bus voltage V
BUSBe 160 volts, the canonical parameter of the element of ballast circuit 10 ' is among Fig. 6: resonant inductance L
RBe 800 microhenrys; Resonant capacitance C
R1Be 7.7 nanofarads; Feedback resistance R
FIt is 1 ohm; Capacitance 21 is 0.22 microfarads; Timing resistor R
TIt is 10.5 kilo-ohms; Timing capacitor C
T1Be 1.0 nanofarads; Timing capacitor C
T2Be 5.6 nanofarads; The canonical parameter of the element of circuit is among Fig. 7: electric capacity 50 is 0.33 microfarads; Resistance 52,56 and 59 each all be 2.4 megaohms; Zener diode 54 is 7.5 volts; MOSFET40 is n channel enhancement MOSFET, and these all are the products of the PhilipsSemiconductors of Dutch Eindhoven, are numbered BSN20.
As mentioned above, embodiments of the invention can be set up timing voltage V22 during lamp is lighted He during the lamp steady-working state.For example, can improve feedback resistance R
FResistance improve the feedback voltage V at two ends
FSo, with feedback voltage V according to Fig. 4
FNegligible effect opposite, the feedback voltage V during the lamp steady-working state
FCan be very big, surpass timing capacitor C
TVoltage.Yet, because feedback resistance R
FResistance loss increase, so such scheme is not best.
Though below described the present invention in conjunction with specific embodiments, one of ordinary skill in the art can be done many modifications and variations.It is therefore to be understood that appending claims is intended to topped all such modifications and the change that falls in the spirit and scope of the present invention.
Claims (15)
1. ballast circuit with gaseous discharge lamp of resistance heating negative electrode comprises:
(a) contain the resonant load circuit of gaseous discharge lamp, have first and second resonance impedances, the value of resonance impedance determines the operating frequency of described resonant load circuit;
(b) direct current that links to each other with described resonant load circuit becomes the converter that exchanges, so that in described resonant load circuit, cause alternating current, and comprise the bus conductor that is connected in series in direct voltage and first and second switches between the ground, and has a common node, described AC load electric current this common node of flowing through;
(c) feedback circuit is used for providing the feedback signal of representing described resonant load circuit current amplitude;
(d) high voltage integrated circuit of described first and second switches of driving, its frequency is determined by the timing signal that mainly comprises the described feedback signal during lamp is lighted, thereby described feedback signal makes described high voltage integrated circuit drive described first and second switches during lamp is lighted, and its switching frequency causes described resonant load circuit resonance; And
(e) spacer assembly is used for making when providing electric energy to described converter circuit described feedback signal and described timing signal to isolate one period scheduled time, so that before lamp is lighted described negative electrode was heated in described one period scheduled time.
2. the ballast circuit of claim 1, timing signal shown in wherein said feedback circuit makes are mainly determined by a signal that is not described feedback signal during the lamp steady-working state.
3. the ballast circuit of claim 1, wherein:
(a) described high voltage integrated circuit comprises a timing input that receives described timing signal, switching frequency by described timing signal the transition number of times during from a threshold voltage to another threshold voltage or reverse situation determine; And
(b) the described feedback signal signal summation that can produce the steady job frequency of described first and second switches when not having feedback signal at described timing input.
4. the ballast circuit of claim 3 also comprises the timing capacitor of pair of series between described timing input and ground.
5. the ballast circuit of claim 4, wherein said spacer assembly comprise the common node that is connected described series connection timing capacitor and have a switch between the conductor of described feedback signal.
6. the ballast circuit of claim 5, wherein said feedback circuit comprises a feedback resistance, the one end links to each other with ground, has described feedback signal on the other end.
7. the ballast circuit of claim 5, wherein:
(a) described switch comprises having the MOSFET that is connected the intrinsic diode between its main conducting end; And
(b) between the DC power supply voltage on described common node and the earth potential, provide a resistance, so that described common node is remained on the earth potential.
8. the ballast circuit of claim 1, wherein said gaseous discharge lamp comprises fluorescent lamp.
9. ballast circuit with fluorescent lamp of resistance heating negative electrode comprises:
(a) contain the resonant load circuit of gaseous discharge lamp, have first and second resonance impedances, the value of resonance impedance determines the operating frequency of described resonant load circuit;
(b) direct current that links to each other with described resonant load circuit becomes the converter that exchanges, so that in described resonant load circuit, cause alternating current, and comprise the bus conductor that is connected in series in direct voltage and first and second switches between the ground, and has a common node, described AC load electric current this common node of flowing through;
(c) feedback circuit is used for providing the feedback signal of representing described resonant load circuit current amplitude;
(d) high voltage integrated circuit of described first and second switches of driving, described high voltage integrated circuit comprises a timing input that receives described timing signal, the switching frequency of described first and second switches by described timing signal the transition number of times during from a threshold voltage to another threshold voltage or reverse situation determine;
(e) described timing signal mainly comprises described feedback signal during lamp is lighted, thereby described feedback signal makes described high voltage integrated circuit drive described first and second switches during lamp is lighted, and its switching frequency makes described resonant load circuit resonance; And
(f) spacer assembly is used for making when providing electric energy to described converter circuit described feedback signal and described timing signal to isolate one period scheduled time, so that before lamp is lighted described negative electrode was heated in described one period scheduled time.
10. the ballast circuit of claim 9, the secondary signal summation that wherein said feedback signal can produce the steady job frequency of described first and second switches at described timing input when not having feedback signal.
11. the ballast circuit of claim 10, wherein said feedback circuit make described timing signal mainly be determined by described secondary signal during the lamp steady-working state.
12. the ballast circuit of claim 9 also comprises the timing capacitor of pair of series between described timing input and ground.
13. the ballast circuit of claim 12, wherein said spacer assembly comprise the common node that is connected described series connection timing capacitor and have a switch between the conductor of described feedback signal.
14. the ballast circuit of claim 13, wherein said feedback circuit comprise a feedback resistance, the one end links to each other with ground, has described feedback signal on the other end.
15. the ballast circuit of claim 13, wherein:
(a) described switch comprises having the MOSFET that is connected the intrinsic diode between its main conducting end; And
(b) between the DC power supply voltage on described common node and the earth potential, provide a resistance, so that described common node is remained on the earth potential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97118697 CN1179077A (en) | 1996-09-19 | 1997-09-19 | High voltage integrated circuit driven semibridge gas discharge lamp ballast |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US718,178 | 1976-08-27 | ||
| CN 97118697 CN1179077A (en) | 1996-09-19 | 1997-09-19 | High voltage integrated circuit driven semibridge gas discharge lamp ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1179077A true CN1179077A (en) | 1998-04-15 |
Family
ID=5174898
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97118697 Pending CN1179077A (en) | 1996-09-19 | 1997-09-19 | High voltage integrated circuit driven semibridge gas discharge lamp ballast |
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| CN (1) | CN1179077A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7586269B2 (en) | 2006-04-21 | 2009-09-08 | Hon Hai Precision Industry Co., Ltd. | Device for driving light source module |
| CN101808446A (en) * | 2008-12-23 | 2010-08-18 | 赤多尼科阿特可两合股份有限公司 | Starting circuit for lighting apparatus driver |
| CN102577626A (en) * | 2009-09-29 | 2012-07-11 | 欧司朗股份有限公司 | Electronic ballast and method for operating at least one discharge lamp |
| CN102739228A (en) * | 2011-04-12 | 2012-10-17 | 英飞凌科技股份有限公司 | Circuit for determining an average value |
| CN103517514A (en) * | 2012-06-22 | 2014-01-15 | 香港城市大学 | System and method for emulating a gas discharge lamp |
-
1997
- 1997-09-19 CN CN 97118697 patent/CN1179077A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7586269B2 (en) | 2006-04-21 | 2009-09-08 | Hon Hai Precision Industry Co., Ltd. | Device for driving light source module |
| CN101808446A (en) * | 2008-12-23 | 2010-08-18 | 赤多尼科阿特可两合股份有限公司 | Starting circuit for lighting apparatus driver |
| CN102577626A (en) * | 2009-09-29 | 2012-07-11 | 欧司朗股份有限公司 | Electronic ballast and method for operating at least one discharge lamp |
| CN102577626B (en) * | 2009-09-29 | 2014-12-10 | 欧司朗股份有限公司 | Electronic ballast and method for operating at least one discharge lamp |
| US8994285B2 (en) | 2009-09-29 | 2015-03-31 | Osram Ag | Electronic ballast and method for operating at least one discharge lamp |
| CN102739228A (en) * | 2011-04-12 | 2012-10-17 | 英飞凌科技股份有限公司 | Circuit for determining an average value |
| CN102739228B (en) * | 2011-04-12 | 2015-03-25 | 英飞凌科技股份有限公司 | Circuit for determining an average value |
| CN103517514A (en) * | 2012-06-22 | 2014-01-15 | 香港城市大学 | System and method for emulating a gas discharge lamp |
| CN103517514B (en) * | 2012-06-22 | 2017-10-24 | 香港城市大学 | System and method for emulating a gas discharge lamp be provided |
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