CN101730369A - Method for adjusting brightness of fluorescent lamp - Google Patents
Method for adjusting brightness of fluorescent lamp Download PDFInfo
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- CN101730369A CN101730369A CN200910189132A CN200910189132A CN101730369A CN 101730369 A CN101730369 A CN 101730369A CN 200910189132 A CN200910189132 A CN 200910189132A CN 200910189132 A CN200910189132 A CN 200910189132A CN 101730369 A CN101730369 A CN 101730369A
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- 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
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- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The invention relates to a method for adjusting the brightness of a fluorescent lamp, which is used for adjusting the brightness of the fluorescent lamp based on a common electronic ballast or an integrative fluorescent lamp circuit, wherein the integrative fluorescent lamp circuit comprises a single-chip and a digital-analog conversion circuit which are connected with an input end of a high-frequency inverter circuit in turn; an input end of the single-chip is connected with an APFC circuit with fixed working frequency to perform recognition counting on working current pulses; the number Ym of the working current pulses in a fully conducting state corresponds to a state with the maximum brightness and corresponds to a brightness adjustment control voltage signal Xm; the relation between the counted number Y of the working current pulses and a brightness adjustment control voltage signal X in a one-way pulsating voltage cycle is adjusted to be a linear or logarithmic relation; and a brightness adjustment control voltage signal X1 generated accordingly is sent to the high-frequency inverter circuit to perform brightness adjustment. The method realizes the total range smooth brightness adjustment of the fluorescent lamp, can also ensure the normal lightening of the fluorescent lamp when tangent brightness adjustment is at low voltage, solves the problem of a high start-up point of the fluorescent lamp, can adjust the brightness of the fluorescent lamp by using any existing common front-back edge tangent brightness adjusters, and has full compatibility.
Description
Technical field
The present invention relates to a kind of electric ballast of fluorescent lamp or light-dimming method of integral fluorescent lamp of being used for.
Background technology
Fluorescent lamp is one of lighting source the most commonly used.Along with people improve constantly requirement energy-conservation, fire-light effect, method that brightness of fluorescent lamp is regulated has appearred, with according to different lighting requirements such as brightness of illumination, lighting atmospheres, realize different illuminating effects.
As shown in Figure 1, existing 25 watts of following small-power ordinary electronic ballasts or integral fluorescent lamp circuit adopt EMI circuit 1 (Electro Magnetic Interference electromagnetic interference filter circuit), rectification circuit 2, DC filtering circuit 4 and the regulatable high-frequency inverter circuit 5 that is linked in sequence, by high-frequency inverter circuit 5 driving fluorescent lamp pipes 6.
As shown in Figure 2, existing more than 25 watts in high-power ordinary electronic ballast or integral fluorescent lamp circuit adopt the EMI circuit 1 that is linked in sequence, rectification circuit 2, Passive Power correcting circuit PPFC (PassivePower Factor Correction Circuitry, also claim passive power factor correcting circuit) or active power correcting circuit APFC (Active Power Factor Correction Circuitry, also claim APFC) 3, DC filtering circuit 4 and regulatable high-frequency inverter circuit 5 are by high-frequency inverter circuit 5 driving fluorescent lamp pipes 6.
As shown in Figure 3, existing more than 25 watts in high-power ordinary electronic ballast or integral fluorescent lamp circuit to the light-dimming method that fluorescent lamp carried out be: between rectification circuit 2 and high-frequency inverter circuit 5, increase the step-down shaping circuit 8 that is connected successively and integration, smoothing circuit 9, between fluorescent tube 6 and high-frequency inverter circuit 5, fluorescent lamp current detection circuit 7 be set.This fluorescent lamp current detection circuit 7 exports high-frequency inverter circuit 5 to after detecting the glow current of fluorescent tube 6 and carrying out shaping, smoothing processing; This step-down shaping circuit 8 and integration, 9 pairs of front and back before being connected EMI circuit 1 of smoothing circuit are along phase-cut dimming device (not shown) cut adjusting and through EMI circuit 1, rectification circuit 2 go to disturb with rectification after line voltage carry out step-down, shaping, integration, after smoothly waiting processing, obtain a low voltage signal that changes with the approximate equal proportion of the back mutually effective value of input AC TURP, export high-frequency inverter circuit 5 to, this high-frequency inverter circuit 5 adopts frequency modulation, transfer modes such as wide or pressure regulation, the glow current of control fluorescent tube is consistent with cut adjusting back input voltage effective value ratio, is implemented in and inserts the light modulation of phase-cut dimming device on the incoming line, the dimming effect that fluorescent lamp tube brightness is changed in proportion.
There is following defective in the light-dimming method of existing small-power and middle high-power fluorescent lamp:
1, because of active or passive power factor correction circuit is not set, the small-power fluorescent lamp is vulnerable to the Harmonic Interference of electrical network, brings problems such as fluorescent lamp flicker, luminous instability;
2, to the small-power fluorescent lamp, when input voltage waveform is carried out cut, transistor moment conducting in the phase-cut dimming device or by producing high spike, electric capacity, inductance component acting in conjunction produce phase shift and resonance in this spike and the circuit, to influence the stability of late-class circuit work, under extreme case, may cause late-class circuit to burn;
3, to the small-power fluorescent lamp, when occur input voltage by cut after the very low and fluorescent lamp of effective value when not starting (promptly non-loaded), can't obtain level and smooth equal proportion low voltage signal, cause high-frequency inverter circuit can't start work; High-frequency inverter circuit must be when the input voltage effective value reach a certain height could startup work, make the start-up point of whole ballast or integral fluorescent lamp circuit too high, cause that dimming scope is narrow, fluorescent lamp can't be regulated in low-light level;
4, to the small-power fluorescent lamp and in powerful fluorescent lamp, because the input line voltage is a sine voltage, voltage effective value after phase-cut dimming process and the sinusoidal wave cut is nonlinear correspondence relation, the final intrinsic brilliance of fluorescent lamp is regulated and must be non-linear, cause existing dimmer in the adjusting of back segment, the brightness of sensation fluorescent lamp changes not obvious.
Summary of the invention
The technical problem to be solved in the present invention is, a kind of method for adjusting brightness of fluorescent lamp is provided, flicker when overcoming the adjusting brightness of fluorescent lamp that prior art exists, luminous instability, fluorescent lamp circuit produce phase shift and resonance, the late-class circuit job stability are impacted, ballast circuit start-up point height, cause that dimming scope is narrow, fluorescent lamp can't be regulated in low-light level, brightness of fluorescent lamp is regulated and is the non-linear dimmer that causes in back segment is regulated because of the cut due to voltage spikes, and the sensation fluorescent lamp is regulated defectives such as the brightness variation is not obvious.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method for adjusting brightness of fluorescent lamp is provided, based on common phase-cut dimming device electronic ballast for fluoresent lamp or integral fluorescent lamp circuit being carried out the brightness of fluorescent lamp adjusting: described electronic ballast for fluoresent lamp or integral fluorescent lamp circuit comprise the EMI circuit that is linked in sequence, rectification circuit, the active power correcting circuit, DC filtering circuit and regulatable high-frequency inverter circuit, described high-frequency inverter circuit connects fluorescent tube, also is connected with fluorescent lamp glow current testing circuit between described fluorescent tube and the described high-frequency inverter circuit; It is characterized in that, also comprise single-chip microcomputer and D/A switch circuit, the output of described single-chip microcomputer is connected to the input of described high-frequency inverter circuit by described D/A switch circuit, and described single-chip microcomputer input connects described active power correcting circuit to be discerned and count the operating current pulse of this circuit; Described active power correcting circuit operating frequency is fixed;
Described light-dimming method comprises:
Define the described operating current pulse number Y of counting under the described phase-cut dimming device fully conducting state
mCorresponding to phase angle is the high-high brightness state of 180 degree, and the corresponding brightness adjustment control voltage signal of this high-high brightness state is X
mRevise to regulate the required analog quantity brightness adjustment control voltage signal X of brightness of fluorescent lamp correspondence and a unidirectional pulsating voltage after rectification in the cycle pass to the number Y of described operating current step-by-step counting be linear relationship or logarithmic relationship;
Described single-chip microcomputer and described D/A switch circuit be according to described linear relationship or the logarithmic relationship revised, generates the counting number Y of described operating current pulse when regulating corresponding to cut
1Corresponding brightness adjustment control voltage signal X
1, and this brightness adjustment control voltage signal is sent to described high-frequency inverter circuit carries out light modulation.
In method for adjusting brightness of fluorescent lamp of the present invention, described definite according to following condition in the cycle to the linear relationship of the number Y of the described operating current step-by-step counting required brightness adjustment control voltage signal X corresponding with regulating brightness of fluorescent lamp at a unidirectional pulsating voltage: under fully conducting state, the counting number Y of described operating current pulse
mThe high-high brightness state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is X
mThe counting number of described operating current pulse is 1/2nd Y
m50% luminance state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is 1/2nd X
m
In method for adjusting brightness of fluorescent lamp of the present invention, described definite according to following condition in the cycle to the logarithmic relationship of the number Y of the described operating current step-by-step counting required brightness adjustment control voltage signal X corresponding with regulating brightness of fluorescent lamp at a unidirectional pulsating voltage: under fully conducting state, the counting number Y of described operating current pulse
mThe high-high brightness state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is X
m
In method for adjusting brightness of fluorescent lamp of the present invention, described active power correcting circuit adopts boost mode work.
In method for adjusting brightness of fluorescent lamp of the present invention, also comprise the digital circuit that is used for frequency division, the output of this digital circuit connects the input of described single-chip microcomputer, the input of this digital circuit connects described active power correcting circuit to be discerned and frequency division the operating current pulse of described active power correcting circuit, and the pulse of described single-chip microcomputer after to frequency division counted.
In method for adjusting brightness of fluorescent lamp of the present invention, described single-chip microcomputer input is connected on the auxiliary winding of the energy storage inductor L1 that boosts in the described active power correcting circuit, or series resistor R between transistor Q1 in the described active power correcting circuit and the power cathode, described single-chip microcomputer input is connected between described transistor Q1 and the described resistance R.
In method for adjusting brightness of fluorescent lamp of the present invention, described brightness adjustment control voltage signal X
1Generate in the following manner: described D/A switch circuit is that series and parallel is connected on one group of resistance on a plurality of I0 mouths of described single-chip microcomputer, and encoding to mix through described one group of resistance generates described brightness adjustment control voltage signal X
1
In method for adjusting brightness of fluorescent lamp of the present invention, described brightness adjustment control voltage signal X
1Generate in the following manner: described D/A switch circuit is an integral filter circuit, and high-frequency impulse bandwidth modulation signals of described single-chip microcomputer output carries out integral filtering through described integral filter circuit and generates described brightness adjustment control voltage signal X
1
In method for adjusting brightness of fluorescent lamp of the present invention, described brightness adjustment control voltage signal X
1Generate in the following manner: described D/A switch circuit can adopt that the D/A chip is external to be connected the output of described single-chip microcomputer or to be integrated in the described single-chip microcomputer.
Implement method for adjusting brightness of fluorescent lamp of the present invention, compared with the prior art, its beneficial effect is:
1. the operating current step-by-step counting that in the cycle active power correcting circuit is detected based on a unidirectional pulsating voltage after rectification, by brightness adjustment control voltage signal being revised as the linear or logarithmic relationship of operating current step-by-step counting number that detects with the active power correcting circuit, realized the level and smooth light modulation of gamut of fluorescent lamp, can reach and incandescent lamp, dimming effect that tungsten halogen lamp is the same;
2. because the characteristic of human eye is more more responsive than high brightness to low-light level, adopt the light modulation of logarithmic curve mode just in time to meet the demand of human eye, thereby the sensation dimming effect is more smoothly comfortable to the light sensitive degree;
3. by adopting active power correcting circuit (APFC circuit), eliminate the interference of mains by harmonics, guaranteed the fluorescent lamp stabilized illumination; The APFC circuit guarantees line voltage distribution and line current homophase, has avoided due to voltage spikes phase shift phenomenon after the cut, is difficult for producing resonance, guarantees that late-class circuit is stable, trouble free service; When the APFC circuit adopts boost mode work, regulate the back effective voltage when low in cut, can guarantee that also fluorescent lamp normally lights, solved the too high problem of existing fluorescent lamp starting point;
4. can use existing any common front and back to regulate the brightness of fluorescent lamp, have full compatibility along the phase-cut dimming device.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 be existing 25 watts with interior small-power ordinary electronic ballast or integral fluorescent lamp circuit structure block diagram.
Fig. 2 be existing more than 25 watts in high-power ordinary electronic ballast or integral fluorescent lamp circuit structure block diagram.
Fig. 3 be existing more than 25 watts in high-power ordinary electronic ballast or integral fluorescent lamp light-dimming method schematic diagram.
Fig. 4 is the electric ballast or the integral fluorescent lamp circuit diagram of method for adjusting brightness of fluorescent lamp of the present invention.
Fig. 5 is a kind of execution mode that in the method for adjusting brightness of fluorescent lamp of the present invention active power correcting circuit working pulse signal is detected.
Fig. 6 is the another kind of execution mode that in the method for adjusting brightness of fluorescent lamp of the present invention active power correcting circuit working pulse signal is detected.
Fig. 7 is the theory diagram of method for adjusting brightness of fluorescent lamp of the present invention.
Fig. 8 is the voltage-regulation oscillogram of electronic ballast for fluoresent lamp or integral fluorescent lamp circuit correspondence in the method for adjusting brightness of fluorescent lamp of the present invention.
Fig. 9 is in the method for adjusting brightness of fluorescent lamp of the present invention, to the counting number Y of APFC circuit working current impulse and the functional relation fair curve and the not contrast of fair curve of brightness adjustment control voltage signal X.
Figure 10 is in the method for adjusting brightness of fluorescent lamp of the present invention, the functional relation fair curve of the percentage of the luminous luminous flux of fluorescent tube that the voltage effective angle after the dimmer cut of the counting number Y correspondence of APFC circuit working current impulse is corresponding with brightness adjustment control voltage signal X and the not contrast of fair curve.
Embodiment
Method for adjusting brightness of fluorescent lamp of the present invention carries out brightness of fluorescent lamp based on as shown in Figure 7 ordinary electronic ballast or integral fluorescent lamp circuit and regulates, and Fig. 4 has provided an instantiation.
As Fig. 4, shown in Figure 7, above-mentioned electronic ballast for fluoresent lamp or integral fluorescent lamp circuit comprise the EMI circuit 1 that is linked in sequence, rectification circuit 2, active power correcting circuit 3 (APFC circuit, as shown in Figure 4, active power correcting circuit 3 comprises the energy storage inductor L1 that boosts, booster diode D, transistor Q1 and APFC chip for driving 31 are (as NCP1653, steady job frequencies such as Uc1854 series are driven merit IC), the function of APFC chip for driving also can add the respective peripheral circuit by mcu programming and replace), DC filtering circuit 4 and regulatable high-frequency inverter circuit 5 (as the semibridge system inverse changing driving circuit), high-frequency inverter circuit 5 connects driving fluorescent lamp pipe 6, and EMI circuit 1 input connects phase-cut dimming device 100 and carries out cut adjusting (as shown in Figure 8).Between fluorescent tube 6 and high-frequency inverter circuit 5, also be connected with fluorescent lamp glow current testing circuit 7, between active power correcting circuit 3 and high-frequency inverter circuit 5, also be connected with single-chip microcomputer 10 and D/A switch circuit 11, the output of single-chip microcomputer 10 is by being connected to the input of high-frequency inverter circuit with D/A switch circuit 11, and the input of single-chip microcomputer 10 is connected with the operating current pulse of 3 pairs of active power correcting circuits 3 of source power correcting circuit and discerns and count.The operating frequency of active power correcting circuit 3 is fixed.
The mode that detects of the operating current pulse of APFC circuit 3 includes but not limited to:
As shown in Figure 4, be connected the operating current pulse that detects APFC circuit 3 on the auxiliary winding of the energy storage inductor L1 that boosts in the active power correcting circuit 3 by input with single-chip microcomputer 10.
As shown in Figure 5, by series resistor R between transistor Q1 in active power correcting circuit 3 and the power cathode, the input of single-chip microcomputer 10 is connected between transistor Q1 and the resistance R, detects the operating current pulse of APFC circuit 3.
As shown in Figure 6, be connected on the positive polarity after the rectification, the drive end of the output termination transistor Q1 of APFC chip for driving 31, be connected to the input of single-chip microcomputer simultaneously by input with the APFC chip for driving 31 in the APFC circuit 3.APFC chip for driving 31 is used to detect having or not of unidirectional pulsating voltage, when cut voltage, the drive end that produces pulse and output to transistor Q1 produces operating current, so, this pulse is equal to the operating current pulse of transistor Q1, therefore, single-chip microcomputer has promptly detected the operating current pulse (being the operating current pulse of APFC circuit 3) of transistor Q1.
Method for adjusting brightness of fluorescent lamp of the present invention comprises:
Be defined in the operating current pulse number Y of the APFC circuit 3 of counting under the phase-cut dimming device fully conducting state
mCorresponding to phase angle is the high-high brightness state of 180 degree, and the corresponding brightness adjustment control voltage signal of this high-high brightness state is X
m
X is modified as follows to brightness adjustment control voltage signal: regulate the brightness adjustment control voltage signal X of brightness of fluorescent lamp correspondence and a unidirectional pulsating voltage after rectification in the cycle pass to the number Y of operating current step-by-step counting be linear relationship or logarithmic relationship; Promptly set up Y=aX+b relation or Y=log aX relation.Brightness adjustment control voltage signal X adopts analog signal.
Single-chip microcomputer 10 and D/A switch circuit 11 be according to above-mentioned linear relationship or the logarithmic relationship revised, generates the counting number Y of APFC circuit 3 operating current pulses when regulating corresponding to cut
1Corresponding brightness adjustment control voltage signal X
1, then this brightness adjustment control voltage signal is sent to high-frequency inverter circuit 5, fluorescent tube 6 is carried out light modulation.
The rising edge starting point phase place that is defined in first operating current pulse in the unidirectional pulsating voltage cycle after the rectification is that the trailing edge terminal point phase place of 0 degree phase angle, last operating current pulse is final phase angle.
0 degree phase angle of above-mentioned definition and final phase angle, a unidirectional pulsating voltage after rectification was spent corresponding to 0 degree and 180 in the cycle.A unidirectional pulsating voltage after rectification is in the cycle, and the pulse number of the operating current pulse train of APFC circuit 3 is Y
m, the counting number Y that carries out the operating current pulse of 10 pairs of APFC circuit 3 of single-chip microcomputer behind the phase-cut dimming according to phase-cut dimming device 100
1With linear relationship or the logarithmic relationship of Y, X, can determine corresponding cut phase place, i.e. the cut position of phase-cut dimming device 100.
The waveform F of the APFC circuit working current impulse that waveform E that Fig. 8 shows waveform A and the waveform B after the cut before 100 cuts of phase-cut dimming device of A, B in ordinary electronic ballast or the integral fluorescent lamp circuit, C, D, each section of E, waveform C, the waveform D after the rectification, APFC circuit working after being transferred to the EMI circuit boost after DC filtering and single-chip microcomputer detect, wherein, B
1, C
1, D
1The cut corresponding voltage waveform of expression forward position phase-cut dimming device, B
2, C
2, D
2The expression back is along the cut corresponding voltage waveform of phase-cut dimming device.E is that 3 work of APFC circuit are boosted after the high voltage direct current V that DC filtering 4 forms
BUS, as the working power voltage of the regulatable high-frequency inverter circuit 5 of back level.F
1The current pulse signal that expression obtains from the energy storage inductor L1 auxiliary winding that boosts, F
2The current pulse signal that expression obtains from transistor Q1 and voltage negative pole series resistance R.
Definite mode of the linear relationship of above-mentioned Y, X includes but not limited to:
1, under fully conducting state, the counting number Y of operating current pulse
mThe high-high brightness state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is X
mThe counting number of operating current pulse is 1/2nd Y
m50% luminance state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is 1/2nd X
m, determine linear function Y=aX+b according to these 2 conditions.
2, under fully conducting state, the counting number Y of operating current pulse
mThe high-high brightness state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is X
m0 electrical voltage point of a unidirectional pulsating voltage in the cycle after rectification, the counting number of operating current pulse is 0, the off state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is Y
0, determine linear function Y=aX+b according to these 2 conditions.
The logarithmic relationship of above-mentioned Y, X is determined as follows: under fully conducting state, and the counting number Y of operating current pulse
mThe high-high brightness state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is X
m, determine logarithmic function Y=log aX according to this condition.
When single-chip microcomputer does not catch up with the high-frequency work current impulse recognition speed of active power correcting circuit, can be in the following way: the digital circuit that is provided for frequency division, the output of this digital circuit connects the input of single-chip microcomputer 10, the input of this digital circuit is connected with the operating current pulse of 3 pairs of active power correcting circuits 3 of source power correcting circuit and discerns and frequency division, and the pulse behind 10 pairs of frequency divisions of single-chip microcomputer is counted.
Digital circuit is definite as required to the operating current pulse of active power correcting circuit 3 being carried out frequency division, as carries out four frequency divisions, can obtain satisfied identification counting effect.
Above-mentioned D/A switch circuit 11 can adopt that the D/A chip is external to be connected the output of single-chip microcomputer 10 or to be integrated in the single-chip microcomputer 10, generates brightness adjustment control voltage signal X
1
Above-mentioned brightness adjustment control voltage signal X
1According to including but not limited to that following mode generates:
1, D/A switch circuit 11 adopts series and parallel to be connected on one group of resistance on a plurality of I0 mouths of single-chip microcomputer 10, and encoding to mix through this group of resistance generates brightness adjustment control voltage signal X
1
2, the D/A switch circuit adopts integral filter circuit, and high-frequency impulse bandwidth modulation signals of single-chip microcomputer 10 outputs carries out integral filtering through this integral filter circuit and generates brightness adjustment control voltage signal X
1
As Fig. 9, shown in Figure 10, the relation of the number Y of brightness adjustment control voltage signal X and operating current step-by-step counting is revised as relation curve behind linear relationship or the logarithmic relationship, with the relation curve of the number Y of unmodified brightness adjustment control voltage signal X and operating current step-by-step counting relatively, amended corresponding dimming effect meets human eye to the low-light level sensitivity, to the insensitive characteristics of high brightness, make and use the technology of the present invention, the existing common dimmer of employing that fluorescent lamp is carried out light modulation, can reach level and smooth comfortable dimming effect.
Claims (9)
1. method for adjusting brightness of fluorescent lamp, based on common phase-cut dimming device electronic ballast for fluoresent lamp or integral fluorescent lamp circuit being carried out the brightness of fluorescent lamp adjusting: described electronic ballast for fluoresent lamp or integral fluorescent lamp circuit comprise EMI circuit, rectification circuit, active power correcting circuit (APFC), DC filtering circuit and the regulatable high-frequency inverter circuit that is linked in sequence, described high-frequency inverter circuit connects fluorescent tube, also is connected with fluorescent lamp glow current testing circuit between described fluorescent tube and the described high-frequency inverter circuit; It is characterized in that, also comprise single-chip microcomputer and D/A switch circuit, the output of described single-chip microcomputer is connected to the input of described high-frequency inverter circuit by described D/A switch circuit, and described single-chip microcomputer input connects described active power correcting circuit to be discerned and count the operating current pulse of this circuit; Described active power correcting circuit operating frequency is fixed;
Described light-dimming method comprises:
The described operating current pulse number Ym that defines counting under the described phase-cut dimming device fully conducting state is the high-high brightness state of 180 degree corresponding to phase angle, and the corresponding brightness adjustment control voltage signal of this high-high brightness state is X
mRevise to regulate the required analog quantity brightness adjustment control voltage signal X of brightness of fluorescent lamp correspondence and a unidirectional pulsating voltage after rectification in the cycle pass to the number Y of described operating current step-by-step counting be linear relationship or logarithmic relationship;
Described single-chip microcomputer and described D/A switch circuit be according to described linear relationship or the logarithmic relationship revised, generates the counting number Y of described operating current pulse when regulating corresponding to cut
1Corresponding brightness adjustment control voltage signal X
1, and this brightness adjustment control voltage signal is sent to described high-frequency inverter circuit carries out light modulation.
2. method for adjusting brightness of fluorescent lamp as claimed in claim 1, it is characterized in that, described definite according to following condition in the cycle to the linear relationship of the number Y of the described operating current step-by-step counting required brightness adjustment control voltage signal X corresponding with regulating brightness of fluorescent lamp at a unidirectional pulsating voltage: under fully conducting state, the counting number Y of described operating current pulse
mThe high-high brightness state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is X
mThe counting number of described operating current pulse is 1/2nd Y
m50% luminance state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is 1/2nd X
m
3. method for adjusting brightness of fluorescent lamp as claimed in claim 1, it is characterized in that, described definite according to following condition in the cycle to the logarithmic relationship of the number Y of the described operating current step-by-step counting required brightness adjustment control voltage signal X corresponding with regulating brightness of fluorescent lamp at a unidirectional pulsating voltage: under fully conducting state, the counting number Y of described operating current pulse
mThe high-high brightness state of corresponding fluorescent lamp, corresponding brightness adjustment control voltage signal is X
m
4. method for adjusting brightness of fluorescent lamp as claimed in claim 1 is characterized in that, described active power correcting circuit adopts boost mode work.
5. method for adjusting brightness of fluorescent lamp as claimed in claim 1, it is characterized in that, also comprise the digital circuit that is used for frequency division, the output of this digital circuit connects the input of described single-chip microcomputer, the input of this digital circuit connects described active power correcting circuit to be discerned and frequency division the operating current pulse of described active power correcting circuit, and the pulse of described single-chip microcomputer after to frequency division counted.
6. method for adjusting brightness of fluorescent lamp as claimed in claim 1, it is characterized in that, described single-chip microcomputer input is connected on the auxiliary winding of the energy storage inductor L1 that boosts in the described active power correcting circuit, or series resistor R between transistor Q1 in the described active power correcting circuit and the power cathode, described single-chip microcomputer input is connected between described transistor Q1 and the described resistance R.
7. as the described method for adjusting brightness of fluorescent lamp of one of claim 1 to 6, it is characterized in that described brightness adjustment control voltage signal X
1Generate in the following manner: described D/A switch circuit is that series and parallel is connected on one group of resistance on a plurality of I0 mouths of described single-chip microcomputer, and encoding to mix through described one group of resistance generates described brightness adjustment control voltage signal X
1
8. as the described method for adjusting brightness of fluorescent lamp of one of claim 1 to 6, it is characterized in that described brightness adjustment control voltage signal X
1Generate in the following manner: described D/A switch circuit is an integral filter circuit, and high-frequency impulse bandwidth modulation signals of described single-chip microcomputer output carries out integral filtering through described integral filter circuit and generates described brightness adjustment control voltage signal X
1
9. as the described method for adjusting brightness of fluorescent lamp of one of claim 1 to 6, it is characterized in that described D/A switch circuit can adopt that the D/A chip is external to be connected the output of described single-chip microcomputer or to be integrated in the described single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189132A CN101730369A (en) | 2009-12-18 | 2009-12-18 | Method for adjusting brightness of fluorescent lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189132A CN101730369A (en) | 2009-12-18 | 2009-12-18 | Method for adjusting brightness of fluorescent lamp |
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| CN101730369A true CN101730369A (en) | 2010-06-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011075881A1 (en) * | 2009-12-21 | 2011-06-30 | Zou Gaodi | Method for adjusting light of fluorescent lamp |
| WO2018058298A1 (en) * | 2016-09-27 | 2018-04-05 | 绿仕科技控股有限公司 | Dimming switch system and method |
-
2009
- 2009-12-18 CN CN200910189132A patent/CN101730369A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011075881A1 (en) * | 2009-12-21 | 2011-06-30 | Zou Gaodi | Method for adjusting light of fluorescent lamp |
| WO2018058298A1 (en) * | 2016-09-27 | 2018-04-05 | 绿仕科技控股有限公司 | Dimming switch system and method |
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Application publication date: 20100609 |