CN1429057A - Method for starting illuminator and its illuminator equipment - Google Patents
Method for starting illuminator and its illuminator equipment Download PDFInfo
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- CN1429057A CN1429057A CN 01145204 CN01145204A CN1429057A CN 1429057 A CN1429057 A CN 1429057A CN 01145204 CN01145204 CN 01145204 CN 01145204 A CN01145204 A CN 01145204A CN 1429057 A CN1429057 A CN 1429057A
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Abstract
A luminescent equipment includes a luminescent device, a pulse wave output unit, a driving unit and a power supply unit and frequency for warming up period as well as frequency for working period will be provided by the power supply unit to the luminescent device through the driving unit to drive pulse wave output of the pulse wave output unit. The start up method of the luminescent device uses connection pin on special application integrated circuit in scanner to output the pulse waves in different frequency for making the luminescent device warm up lamp tube quickly and for supplying the luminescence device a voltage output frequency with the highest luminous efficiency constantly after the lamp tube has been warmed.
Description
Technical field
The present invention relates to method and luminaire that a kind of photophore starts, be meant a kind of activation that is applied to cold cathode fluorescent lamp especially, method and luminaire that the heat under the utilization cold cathode fluorescent lamp different frequency, the fluorescent lamp of light transition effects start.
Background technology
Scanner (scanner) all needs light source to shine file to be scanned in when operation, allows CCD (Charged Coupled Device) in the scanner can obtain the view data of scanning document well.See thus, the quality of light source is the basis of scanner scans quality quality.So many tame scanners manufacturer focuses on the design and research of scanner light source invariably.
In addition because the volume of scanner considers, so the light source of scanner is small as far as possible, so, most scanner manufacturer all adopt cold cathode fluorescent lamp (Cold CathodeFluorescent Lamp, CCFL).When adopting cold cathode fluorescent lamp, in order to take the light source quality into account, must wait until before operation of scanner that cold cathode fluorescent lamp arrives certain temperature, just allow scanner come into operation, so, the light source that fluorescent lamp sent just can be stablized.So general scanner must exhaust some and allow the enough hot warm time of cold cathode fluorescent lamp when start, could be stably luminous through the cold cathode fluorescent lamp after warm.
Except so considering, also must take the life problems of cold cathode fluorescent lamp into account.If make the life-span of cold cathode fluorescent lamp longer, just must allow its warm time lengthening, this also is the main cause of warm time about about three minutes of the cold cathode fluorescent lamp of present many scanners why.But because the consumer oversizely has complaint for the warm time of scanner more, so scanner make manufacturer just tendency reduce the warm time, to eliminate the discontented of consumer.
So Hewlett-Packard (HP) develops the fast warming method of a cover cold cathode fluorescent lamp, its patent is a United States Patent (USP) the 5th, 907, No. 742 patents, and it adopts the control mode of dual input voltage.During warm, adopt higher input voltage (12 volts), after warm, adopt lower input voltage (about 8 volts) again.The way of HP can allow the warm time of cold cathode fluorescent lamp be reduced to about 10～30 seconds.But, the way of HP is the purpose that reaches fast warming by high voltage at the beginning, that is, allow cold cathode fluorescent lamp during warm, bear higher electric current with fast warming.This measure meeting causes the life-span of cold cathode fluorescent lamp to be reduced, and please refer to following explanation.
Please refer to shown in Figure 1ly, it has illustrated the life curve of the cold cathode fluorescent lamp under different electric currents, and under high current, its life-span is obviously low many.To continue lighting 15000 hours at 5mA (milliampere) and 10mA (milliampere) is example, and the lamp tube service life under the 10mA reduces about 10% than the lamp tube service life of 5mA.This is first problem of HP patent of invention.Secondly, in order to reach two kinds of different input voltages (warm phase and duty cycle), HP adopts pulse-width modulation (Pulse Width Modulation is hereinafter to be referred as PWM) control circuit to control input voltage, and is comparatively complicated on circuit design.At last, the built-in frequency oscillator of HP operating point modulator (Inverter), the meeting drift under different voltages and temperature of its frequency of oscillation is indefinite, between 35～45 kilo hertzs of sesames (kHz), so, will have luminous unsettled situation and take place, and then influence scanning quality.
The method of another fast warming is: install heating wire additional outside the cold cathode fluorescent lamp pipe.This kind is wound in the outer way of cold cathode fluorescent lamp pipe with heating wire, utilizes the temperature of the outer heating wire of fluorescent tube, forces lamp hole temperature to rise to reach the purpose of fast warming.This kind way, though can reach the purpose of fast warming equally, but, owing to must outside fluorescent tube, install heating wire additional.So, on processing procedure, increased some steps; Secondly, increase heating wire and also can increase extra-pay, comprise installation cost and power consumption cost; Wherein, the most serious problem is, is positioned at the outer heating wire of fluorescent tube, can cause the obstruct of light, and then make the luminosity of cold cathode fluorescent lamp inhomogeneous, the quality of influence scanning.
So present cold cathode fluorescent lamp fast warming method all has its restriction and problem points.So, how to allow cold cathode fluorescent lamp can reach fast warming, can prolong again and reach the life-span, most important, can send stable light source, become cold cathode fluorescent lamp important research project very in the application of scanner.
Summary of the invention
The objective of the invention is to propose a kind of response curve, to determine an optimal luminescent frequency of this photophore, optimum temperature frequency and warm time by the frequencies of light efficient that detects photophore; By a pair of frequency control unit, control the output frequency of this fixed voltage source, when this photophore of operation, supply the fixed voltage source of the best warm frequency of this photophore; Through after this warm time, this bifrequency control circuit is supplied the fixed voltage source of this photophore optimal luminescent frequency and method and the luminaire that is started by the photophore that photophore, crystal oscillation unit, impulse wave output unit and power-supply unit are formed, it can make these different optical efficiency fast warmings under different frequency of photophore, and can send stable light source, thereby solved the existing in prior technology problem.
The technical solution adopted in the present invention is: it uses a fixed voltage source with the voltage source as this photophore, it is characterized in that it, comprise the following step: the pin on the Application Specific Integrated Circuit (ASIC, Application Specific Integraled Circuits) in its utilization scanner:
A) measure the frequency and the optical efficiency response curve of this photophore, with an optimal luminescent frequency, a best warm frequency and the warm time that determines this photophore;
B) provide a pair of frequency control unit,, when this photophore of operation, supply the fixed voltage source of the best warm frequency of this photophore to control the output frequency of this fixed voltage source; And
C) through after this warm time, the fixed voltage source of this this optimal luminescent frequency of bifrequency control circuit supply photophore.
In addition, realize the employed luminaire of aforesaid operations, it includes:
One in order to receive an output voltage to send the photophore of a light source;
One crystal oscillation unit in order to the impulse wave that produces a frequency of oscillation;
One in order to the impulse wave of adjusting this frequency of oscillation impulse wave output unit with the impulse wave that produces a best warm frequency and an optimal luminescent frequency; And
One power-supply unit, it is connected with this impulse wave output unit and this photophore, in order to the impulse wave of the warm frequency of this best that receives this impulse wave output unit or this optimal luminescent frequency with the supply power voltage that produces a best warm frequency or the supply power voltage of an optimal luminescent frequency, with output voltage as this photophore.
The invention has the advantages that:
The method and the luminaire that use photophore of the present invention to start, can simply and only need under the condition of a fixing input voltage at circuit, only need the impulse wave frequency by the control impuls wave source, can reach the effect of photophore fast warming, the warm time is the fastest to reach for 5 seconds.
Photophore startup method of the present invention and luminaire because circuit is simple, can reach the effect of saving manufacturing cost; Also because its starting current less (about 8 milliamperes (mA)), and temperature is lower during operate as normal, can increase the life-span of luminous organ pipe.
In addition, the method and the luminaire that utilize photophore of the present invention to start, can with time for exposure of CCD (8 milliseconds 125Hz), and are not subjected to the influence of frequency drift fully synchronously.
Description of drawings
Fig. 1 is under 25 degree Celsius, the lamp tube service life curve chart under the different electric currents of identical fluorescent tube;
Fig. 2 with 60kHz is being luminous efficiency curve figure under the reference frequency for the cold cathode fluorescent lamp of 2.6 millimeters of long 250 millimeters, external diameters;
Fig. 3 is a luminaire functional block diagram of the present invention;
Fig. 4 is a frequency of supply curve chart of the present invention; And
Fig. 5 is the circuit diagram of power-supply unit of the present invention.
Embodiment
Further specify preferred embodiment of the present invention in conjunction with above-mentioned each accompanying drawing now.Embodiments of the invention are to adopt the cold cathode fluorescent lamp of 250 millimeters of length, 2.6 millimeters of outer path lengths as photophore.Shown in Figure 2 is this cold cathode fluorescent lamp with 60 kilo hertzs of sesames (kHz) is being luminous efficiency curve figure under the reference frequency, and wherein, η is a luminous efficiency.Can find that by Fig. 2 the luminous efficiency of cold cathode fluorescent lamp is the highest when frequency of supply is 60kHz, 53 (53%) of the percentage when having only 60kHz during 30kHz.The impulse wave that is higher than the frequency of 60kHz equally also allows the luminous efficiency of cold cathode fluorescent lamp lower, and frequency high-luminous-efficiency more is low more.
The resistance of now supposing cold cathode fluorescent lamp is Rl, under the condition of rated current, and analogy I milliampere (mA), its power consumption is I*I*Rl.According to conservation of energy theorem, the power consumption of this I*I*Rl can be converted to two kinds of form of energy, and a kind of is light, and another kind is a heat.So the cold cathode fluorescent lamp under different frequency of supplies, the energy that it consumed are not that light is more, heat is less, be exactly that light is less, heat is more.
The present invention uses special integrated circuit (the Application SpecificIntegrated Circuits of scanner, ASIC) pin on, promptly utilize the different photo-thermal transition effects that is produced under the above-mentioned frequency of supply difference, reach the purpose of fast warming cold cathode fluorescent lamp.And, can under fixing rated current, for example, below 5 milliamperes (mA), get final product the fast warming fluorescent tube, and not need to come fast warming with big electric current, can increase lamp tube service life.
So as long as detect the cold cathode fluorescent lamp of fixed lamp tube length and outside dimension in advance, it can find out an optimal luminescent frequency and best warm frequency at light, the thermal effect curve chart of different frequency of supplies.During fluorescent tube is warm,, can allow fluorescent tube warm at short notice with the power supply under the warm frequency of the best; Power supply under the optimal luminescent frequency can allow fluorescent tube reach best luminous efficiency, and then allows scanner can obtain best stabilized light source.As for the warm time, then can calculate acquisition according to the power conversion value.
As seen from the above description, the present invention can pass through the frequency of supply of the warm time T of control fluorescent tube in the warm frequency of the best, and the frequency of supply of supplying with lamp works period is the optimal luminescent frequency, can allow fluorescent tube in the quite short time, and the heat of utilizing fluorescent tube itself to be sent is come self-warm.
Below, will explanation the present invention how to reach and produce stable power supply, and, power supply how to be controlled in the frequency of supply of different periods (warm period and work period).
At first, obtain stable power supply, can obtain by the way of output of control input power supply.And the required pulse wave source of power supply can obtain from the pin of the ASIC on the scanner.Because it is to be provided by a crystal oscillator (crystal oscillator) that the frequency of ASIC produces, but not general RC or RL circuit produce, so the frequency of oscillation quite stable that it produced does not have the phenomenon of frequency drift.So, in conjunction with stable voltage source (fixed voltage) and pulse wave source, can reach the purpose that produces power supply, that is, the power supply of a warm frequency of the best and the power supply of an optimal luminescent frequency can be obtained.
Secondly, the result of calculation according to above-mentioned light, thermal power transfer can draw the cold cathode fluorescent lamp under the warm frequency of the best, and the warm time that needs is T.As long as supply with the impulse wave of best warm frequency in warm time T, the impulse wave that the T time is supplied the optimal luminescent frequency later gets final product.In operation, as long as set required warm time T at driver (driver), and the pin of control ASIC is best warm frequency output when being output as warm time T, and T exports for the optimal luminescent frequency after the time and gets final product.
Then, please refer to shown in Figure 3ly, it is a luminaire functional block diagram of the present invention, and it has comprised: crystal oscillator 10, impulse wave output unit (ASIC) 20, power-supply unit 30 and cold cathode fluorescent lamp 40 according to above-mentioned operation principle design.Wherein, crystal oscillator 10 provides a stable frequency of oscillation (MHz), 20 of impulse wave output units with this frequency of oscillation frequency reducing to produce best warm impulse wave of wanting (kHz) required for the present invention and best effort impulse wave (kHz); 30 best warm impulse wave or best effort impulse waves of being imported according to impulse wave output unit 20 of power-supply unit, switch power supply output wherein, to allow cold cathode fluorescent lamp 40 heating (sending more a spot of light simultaneously) apace under the supply of the power supply of the warm frequency of the best, in optimal luminescent frequency luminous (sending more a spot of heat simultaneously).
So power-supply unit 30 has in fact comprised a power voltage supply unit, a diverter switch and a transformer.Wherein, the voltage input unit is 12 volts of (V) alternating voltage inputs.The impulse wave that is produced by received pulse ripple output unit 20, come the switching of control its switch, allow being connected or opening or closing of power voltage supply unit and transformer,, can form one and have the supply power voltage synchronous with the impulse wave source frequency by the output of transformer; And,, can be used as the activation voltage that drives cold cathode fluorescent lamp 40 through the voltage that transformer increases.
So, as long as the user when pressing the operation of scanner key, just, sends a scan instruction, when impulse wave output unit 20 (ASIC) receives this scan instruction, i.e. the best warm frequency that output is set in advance, and the T that picks up counting; After time, i.e. output is the optimal luminescent frequency of setting in advance through T.With Fig. 2 is example, and in the middle of the curve chart, the luminous efficiency during 60kHz is the highest, so can set 60kHz is the optimal luminescent frequency, as for the warm frequency of the best, then can be set at 30kHz, it is 60kHz half.Perhaps, also can set the optimal luminescent frequency is 60kHz, and best warm frequency is 90kHz, below will further specify.
Please refer to shown in Figure 4ly, it is a frequency of supply curve chart of the present invention.From then on curve chart as can be known, as long as with the pulse wave source, that is, the impulse wave output unit 20 among Fig. 3, in the warm time T of the scanner period, the impulse wave of supply 30kHz, after, the impulse wave of supply 60kHz can reach the purpose of fast warming.
At last, please refer to shown in Figure 5ly, it is the circuit diagram of power-supply unit 30 of the present invention, can clearly demonstrate the present invention by this figure and how produce power supply.
As shown in Figure 5, the output of pulse wave source (ASIC just) 50 is connected to the H end points, and the end points C that is connected with the base stage of resistance R 1, transistor Q1 is connected, and joins with the end of coil NB; Another terminal A of R1 is then joined with the input voltage vin of power supply, this end and as the common input end point I of coil NP1, NP2, and the connection end point B of resistance R 2.The other end of coil NB then is connected to end points D mutually with the base stage of transistor seconds Q2 and the other end of resistance R 2.The emitter-base bandgap grading of transistor Q1 and transistor Q2 then is connected to end points E jointly, and is connected with earth terminal GND.The collector electrode of transistor Q1 then is connected to the other end of coil NP1 by end points F, the collector electrode of transistor Q2 then is connected to the other end of coil NP2 by end points G, and both and capacitor C 1 are parallel to end points F and end points G.The coil NS of the output capacitor C 2 of then connecting, the cold cathode photophore is then represented with resistance R 1.
Can be clear that from Fig. 5, the impulse wave of pulse wave source 50 exports the base stage of transistor Q1 to, voltage between end points C and the end points E is promptly made change along with the voltage of pulse wave source 50, does conducting and the variation of opening circuit so form transistor Q1 along with the impulse wave variation of pulse wave source 50.Because transistor Q1 and transistor Q2 are symmetric arrays, and the symmetric arrays of coil NP1 and coil NP2, so, when pulse wave source 50 is output as high-voltage level, will destroy this symmetry, so make end points F different, that is operating voltage Vc will be converted to output voltage V out through coil NP1/NP2 and coil NS with the voltage at end points G two ends; (be generally zero) when pulse wave source 50 is output as low voltage level, because this symmetrical structure, operating voltage Vc is zero, and at this moment, output voltage V out is zero.
In other words, when the impulse wave of pulse wave source 50 inputs to end points C, can allow transistor Q1 and transistor Q2 become a diverter switch, allow input voltage vin can change the operating voltage Vc of process switch.So Vc can obtain output voltage V out with the synchronous supply power voltage of pulse wave source 50 through the conversion of transformer.In addition, the effect of capacitor C 2 then can allow output voltage V out stable.
Though preferred embodiment of the present invention discloses as mentioned above; right its is not in order to limit the present invention; any personage who is familiar with related art techniques; do not breaking away from the spirit and scope of the invention; when the change that can do a little and retouching, so protection range of the present invention must be looked being as the criterion that specification appending claims protection range of the present invention defined.
Claims (16)
1. the method that starts of a photophore, it uses a fixed voltage source with the voltage source as this photophore, it is characterized in that it comprises the following step:
A) measure the frequency and the optical efficiency response curve of this photophore, with an optimal luminescent frequency, a best warm frequency and the warm time that determines this photophore;
B) provide a pair of frequency control unit, controlling the output frequency of this fixed voltage source, when this photophore of operation, supply this fixed voltage source that this photophore should the warm frequency of the best; And
C) through after this warm time, this bifrequency control circuit is supplied this fixed voltage source of this optimal luminescent frequency of this photophore.
2. the method that photophore as claimed in claim 1 starts is characterized in that described photophore, and it is a cold cathode fluorescent lamp.
3. the method that photophore as claimed in claim 1 starts, it is characterized in that described optimal luminescent frequency, it is the output frequency of this voltage source of optical efficiency when the highest under measuring frequency, and the warm frequency of this best is the output frequency of this fixed voltage source when low according to optical efficiency under measuring frequency.
4. the method that photophore as claimed in claim 3 starts is characterized in that the described warm time, and it is the optical efficiency according to the warm frequency of this best, and the time that calculates power conversion that this fixed voltage source exports and be the required heat energy of warm this photophore is long.
5. the method that photophore as claimed in claim 1 starts is characterized in that the warm frequency of described the best, and it is 30 kilo hertzs of sesames (kHz), and this optimal luminescent frequency is 60 kilo hertzs of sesames (kHz).
6. the method that photophore as claimed in claim 1 starts is characterized in that the required pulse wave source of described fixed voltage source is the impulse wave of being exported from an ASIC pin.
7. the method that photophore as claimed in claim 1 starts, it is characterized in that described bifrequency control unit, it is after obtaining an activation instruction, sends a warm FREQUENCY CONTROL instruction to this fixed voltage source, and this fixed voltage source is promptly exported the voltage of the warm frequency of this best; After this warm time of timing, this bifrequency control unit is then sent an operating frequency control command to this fixed voltage source, and this voltage source is promptly exported the fixed voltage of this optimal luminescent frequency.
8. luminaire of realizing claim 1 method is characterized in that it comprises:
One in order to receive an output voltage to send the photophore of a light source;
One crystal oscillation unit in order to the impulse wave that produces a frequency of oscillation;
One in order to the impulse wave of adjusting this frequency of oscillation impulse wave output unit with the impulse wave that produces a best warm frequency and an optimal luminescent frequency; And
One power-supply unit is connected with this impulse wave output unit and this photophore.
9. luminaire as claimed in claim 8 is characterized in that described photophore, and it is a cold cathode fluorescent lamp.
10. luminaire as claimed in claim 8, it is characterized in that described optimal luminescent frequency, it is the output frequency of this power-supply unit of optical efficiency when the highest under measuring frequency, and the warm frequency of this best is the output frequency of this power-supply unit when low according to optical efficiency under measuring frequency.
11. luminaire as claimed in claim 8 is characterized in that the warm frequency of described the best is 30kHz (a kilo hertz sesame), this optimal luminescent frequency is 60kHz (a kilo hertz sesame).
12. luminaire as claimed in claim 8 is characterized in that described impulse wave output unit, it is an Application Specific Integrated Circuit (ASIC).
13. luminaire as claimed in claim 8 is characterized in that described impulse wave output unit, it exports the warm frequency of this best to this power-supply unit after obtaining an enabled instruction; Through timing-after the warm time, this impulse wave output unit is then exported this optimal luminescent frequency to this power-supply unit.
14. luminaire as claimed in claim 13 is characterized in that the described warm time, it is according to the optical efficiency of the warm frequency of this best, and the power conversion that calculates this voltage source is that the time of the required heat energy of warm this photophore is long.
15. luminaire as claimed in claim 8, it is characterized in that described power-supply unit, it comprises a voltage input unit, and switches a switch element and a transformer, this diverter switch is controlled by the impulse wave of the warm frequency of this best or this optimal luminescent frequency and does the switch switching, to switch being connected of this voltage input unit and this transformer, form the output of this operating voltage.
16. luminaire as claimed in claim 15 is characterized in that described voltage input unit, it is one 12 volts of (V) alternating voltage inputs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011452048A CN100415065C (en) | 2001-12-26 | 2001-12-26 | Method for starting illuminator and its illuminator equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011452048A CN100415065C (en) | 2001-12-26 | 2001-12-26 | Method for starting illuminator and its illuminator equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1429057A true CN1429057A (en) | 2003-07-09 |
| CN100415065C CN100415065C (en) | 2008-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011452048A Expired - Fee Related CN100415065C (en) | 2001-12-26 | 2001-12-26 | Method for starting illuminator and its illuminator equipment |
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| Country | Link |
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| CN (1) | CN100415065C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252391B (en) * | 2007-02-21 | 2012-10-10 | 日本电气株式会社 | Transmission system and system startup method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1122997A (en) * | 1994-11-05 | 1996-05-22 | 卢昭正 | Starting device for fluorescent lamp |
| CN2438293Y (en) * | 2000-07-10 | 2001-07-04 | 吴峰 | Ballast of fluorescent lamp |
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2001
- 2001-12-26 CN CNB011452048A patent/CN100415065C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101252391B (en) * | 2007-02-21 | 2012-10-10 | 日本电气株式会社 | Transmission system and system startup method |
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| CN100415065C (en) | 2008-08-27 |
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