CN103476194B - Secondary dimming method of pulse width modulation of gas discharge lamp - Google Patents
Secondary dimming method of pulse width modulation of gas discharge lamp Download PDFInfo
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- CN103476194B CN103476194B CN201310405469.9A CN201310405469A CN103476194B CN 103476194 B CN103476194 B CN 103476194B CN 201310405469 A CN201310405469 A CN 201310405469A CN 103476194 B CN103476194 B CN 103476194B
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Abstract
The invention discloses a secondary dimming method of pulse width modulation of a gas discharge lamp. The pulse duty factor of a first basic wave is modulated and set, the pulse duty factor of a second basic wave is modulated and set, and secondary modulation is conducted on the first basic wave and the second basic wave for dimming. According to the dimming method, secondary pulse width modulation is conducted on the gas discharge lamp, the discharge noise which can be heard by human ears is avoided, and smooth adjusting of the luminance of the gas discharge lamp is also achieved.
Description
[technical field]
The present invention relates to a kind of gaseous discharge lamp pulse width modulation secondary light modulation method.
[background technology]
In currently available technology, the method that gaseous discharge lamp is conventional mainly contains two kinds, and one is regulated by the brightness of adjusting resistance to gaseous discharge lamp, but can there is loss on resistance, and this method is not suitable for the product of load resonant work; Another kind is exactly pulse width modulated dimmer method, regulated by the brightness of pulse-width modulated to gaseous discharge lamp, this method is for all circuit, but when modulating frequency is lower than 20KHZ, the discharge noise that people's ear can be heard will be produced, when modulating frequency is higher than 20KHZ, the smooth adjustment of gaseous discharge lamp brightness just can not be realized.
[summary of the invention]
Instant invention overcomes the deficiency of above-mentioned technology, provide a kind of gaseous discharge lamp pulse width modulation secondary light modulation method, by carrying out the light-dimming method of second pulse width modulated to gaseous discharge lamp, both avoid the discharge noise producing people's ear and can hear, achieve again the smooth adjustment of gaseous discharge lamp brightness.
For achieving the above object, present invention employs following technical proposal:
A kind of gaseous discharge lamp pulse width modulation secondary light modulation method:
The first step: the operation wavelength of gaseous discharge lamp first foundation ripple is LA, total modulation wavelength of first foundation ripple is LB, therefore the maximum tunable optical progression of first foundation ripple is n=LB/LA, modulation setting first foundation wave impulse duty ratio is P1=k × LA/LB, wherein LA < LB, LB >=50us, 1≤k≤n-1,10≤n≤20;
Second step: the operation wavelength of the basic ripple of gaseous discharge lamp second is LA, total modulation wavelength of the second basic ripple is LB, and the basic wave impulse duty ratio of modulation setting second is P2=100%, wherein LA < LB, LB >=50us;
3rd step: with total modulation wavelength for LM, secondary modulation is carried out to first foundation ripple and the second basic ripple, the maximum adjustable progression of secondary modulation is m=LM/LB, therefore secondary modulation duty ratio is Qh=P2 × h/m+P1 × (m-h)/m, wherein LB < LM, 0≤h≤m, 80≤m≤120, h is larger for secondary modulation progression, and secondary modulation duty ratio is larger, and namely gaseous discharge lamp is brighter.
Described first foundation wave impulse duty ratio is 8%≤P1 < 100%.
Described first foundation wave impulse duty ratio is 8%≤P1≤80%.
Described first foundation wave impulse duty ratio is 8%≤P1≤50%.
Described first foundation wave impulse duty ratio is 20%≤P1≤50%.
The operation wavelength of described gaseous discharge lamp first foundation ripple is LA=4us, and total modulation wavelength of gaseous discharge lamp first foundation ripple is LB=50us, and the minimum pulse duty ratio of setting gaseous discharge lamp first time light modulation is p=2 × LA/LB=16%.
Described gaseous discharge lamp is with total modulation wavelength LB=50us of first foundation ripple for operation wavelength during second time light modulation, and the total modulation wavelength during light modulation of gaseous discharge lamp second time is LM=5000us, and therefore second time light modulation progression has m=LM/LB=100.
The invention has the beneficial effects as follows:
1, the present invention is by the light-dimming method of second pulse width modulated, achieves multistage several brightness modulation, achieves level and smooth light modulation.
2, the present invention is applicable to all circuit.
3, electrical loss of the present invention is low, and cost is low, meets the economic benefit of enterprise.
[accompanying drawing explanation]
Fig. 1 is first foundation waveform figure of the present invention;
Fig. 2 is the second basic waveform figure of the present invention;
Fig. 3 is secondary modulation oscillogram of the present invention;
Fig. 4 is the first foundation ripple P1=16% oscillogram of the embodiment of the present invention;
Fig. 5 is the second basic ripple P1=100% oscillogram of the embodiment of the present invention;
Fig. 6 is the secondary modulation oscillogram of the embodiment of the present invention.
[embodiment]
Be described in further detail below in conjunction with accompanying drawing and embodiments of the present invention:
A kind of gaseous discharge lamp pulse width modulation secondary light modulation method is as follows:
101: the operation wavelength of gaseous discharge lamp first foundation ripple is LA, total modulation wavelength is LB, therefore the maximum tunable optical progression of first foundation ripple is n=LB/LA, modulation setting first foundation wave impulse duty ratio is P1=k*LA/LB, wherein LA < LB, LB >=50us, 1≤k≤n-1;
102: the operation wavelength of the basic ripple of gaseous discharge lamp second is LA, and total modulation wavelength is LB, the basic wave impulse duty ratio of modulation setting second is P2=100%;
103: with total modulation wavelength for LM, secondary modulation is carried out to first foundation ripple and the second basic ripple, the maximum adjustable progression of secondary modulation is m=LM/LB, therefore secondary modulation duty ratio is Qh=P2 × h/m+P1 × (m-h)/m, wherein 0≤h≤m, h is larger for secondary modulation progression, and gaseous discharge lamp is brighter.
Total modulation wavelength LB >=50us of first foundation ripple during described first time light modulation, modulating frequency, higher than 20KHZ, when namely modulation wavelength is greater than 50us, can prevent discharge noise.
Embodiment:
The operation wavelength of the gaseous discharge lamp first foundation ripple described in setting is LA=4us, total modulation wavelength LB=50us, the maximum tunable optical progression of gaseous discharge lamp first foundation ripple is n=LB/LA=12 level, therefore Gas lamp first foundation wave impulse duty ratio is P1=k × LA/LB, wherein 0≤k≤12, brightness blast along with the increase of first foundation wave impulse duty ratio of gaseous discharge lamp, 0 grade of light is gaseous discharge lamp non-light emitting state, and 12 grades of light are the brightest state of gaseous discharge lamp.
The operation wavelength of the basic ripple of gaseous discharge lamp second is LA=4us, total modulation wavelength LB=50us, the basic ripple duty ratio P2=100% of modulation setting second.
In order to improve the stability of gaseous discharge lamp and extend its physical life, the present embodiment setting first foundation ripple light modulation progression is k=2, setting gaseous discharge lamp first foundation ripple minimum pulse duty ratio P1=2 × LA/LB=16%.
With total modulation wavelength for LM=5000us, secondary modulation is carried out to first foundation ripple and the second basic ripple, the maximum adjustable progression of secondary modulation is m=LM/LB=100, wherein secondary modulation pulse duty factor is Qh=P2 × h/m+P1 × (m-h)/m, wherein 0≤h≤100, h is larger for secondary modulation progression, and gaseous discharge lamp is brighter.
Therefore, as secondary modulation progression h=0, i.e. secondary modulation pulse duty factor is Q0=100% × 0/100+16% × (100-0)/100 ×=16%.
As secondary modulation progression h=1, i.e. secondary modulation pulse duty factor is Q1=100% × 1/100+16% × (100-1)/100=16.84%.
As secondary modulation progression h=2, i.e. secondary modulation pulse duty factor is Q2=100% × 2/100+16% × (100-2)/100 ×=17.68%.
As secondary modulation progression h=3, i.e. secondary modulation pulse duty factor is Q3=100% × 3/100+16% × (100-3)/100 ×=18.52%.
……
As secondary modulation progression h=100, i.e. secondary modulation pulse duty factor is Q100=100% × 100/100+16% × (100-100)/100=100%.
Brightness blast along with the increase of secondary modulation progression h of gaseous discharge lamp, achieves the level and smooth light modulation of gas discharge light simultaneously.
Claims (7)
1. a gaseous discharge lamp pulse width modulation secondary light modulation method, is characterized in that:
A) operation wavelength of gaseous discharge lamp first foundation ripple is LA, total modulation wavelength of first foundation ripple is LB, therefore the maximum tunable optical progression of first foundation ripple is n=LB/LA, modulation setting first foundation wave impulse duty ratio is P1=k × LA/LB, wherein LA < LB, LB >=50us ,≤k≤n-1,10≤n≤20;
B) operation wavelength of the basic ripple of gaseous discharge lamp second is LA, and total modulation wavelength of the second basic ripple is LB, and the basic wave impulse duty ratio of modulation setting second is P2=100%, wherein LA < LB, LB >=50us
C) with total modulation wavelength for LM, secondary modulation is carried out to first foundation ripple and the second basic ripple, the maximum adjustable progression of secondary modulation is m=LM/LB, therefore secondary modulation duty ratio is Qh=P2 × h/m+P1 × (m-h)/m, wherein LB < LM, 0≤h≤m, 80≤m≤120, h is larger for secondary modulation progression, and secondary modulation duty ratio is larger, and namely gaseous discharge lamp is brighter.
2. a kind of gaseous discharge lamp pulse width modulation secondary light modulation method according to claim 1, is characterized in that described first foundation wave impulse duty ratio is 8%≤P1 < 100%.
3. a kind of gaseous discharge lamp pulse width modulation secondary light modulation method according to claim 2, is characterized in that described first foundation wave impulse duty ratio is 8%≤P1≤80%.
4. a kind of gaseous discharge lamp pulse width modulation secondary light modulation method according to claim 3, is characterized in that described first foundation wave impulse duty ratio is 8%≤P1≤50%.
5. a kind of gaseous discharge lamp pulse width modulation secondary light modulation method according to claim 4, is characterized in that described first foundation wave impulse duty ratio is 20%≤P1≤50%.
6. a kind of gaseous discharge lamp pulse width modulation secondary light modulation method according to claim 1, it is characterized in that the operation wavelength LA=4us of described gaseous discharge lamp first foundation ripple, total modulation wavelength LB=50us of gaseous discharge lamp first foundation ripple, the minimum pulse duty ratio of setting gaseous discharge lamp first time light modulation is p=2 × LA/LB=16%.
7. a kind of gaseous discharge lamp pulse width modulation secondary light modulation method according to claim 1, it is characterized in that described gaseous discharge lamp with total modulation wavelength LB=50us of first foundation ripple for operation wavelength during second time light modulation, total modulation wavelength during the light modulation of gaseous discharge lamp second time is LM=5000us, and therefore second time light modulation progression has m=LM/LB=100.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1800401A2 (en) * | 2004-10-12 | 2007-06-27 | Tir Systems Ltd. | Control apparatus and method with increased resolution for use with modulated light sources |
| CN102098847A (en) * | 2011-01-20 | 2011-06-15 | 广州市番禺区珠江灯光音响实业有限公司 | Field programmable gate array (FPGA)-based light-emitting diode (LED) dimming circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1800401A2 (en) * | 2004-10-12 | 2007-06-27 | Tir Systems Ltd. | Control apparatus and method with increased resolution for use with modulated light sources |
| CN102098847A (en) * | 2011-01-20 | 2011-06-15 | 广州市番禺区珠江灯光音响实业有限公司 | Field programmable gate array (FPGA)-based light-emitting diode (LED) dimming circuit |
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