CN101754551A - Fluorescent lamp abnormal condition protection and sampling circuit - Google Patents
Fluorescent lamp abnormal condition protection and sampling circuit Download PDFInfo
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- CN101754551A CN101754551A CN201010105895A CN201010105895A CN101754551A CN 101754551 A CN101754551 A CN 101754551A CN 201010105895 A CN201010105895 A CN 201010105895A CN 201010105895 A CN201010105895 A CN 201010105895A CN 101754551 A CN101754551 A CN 101754551A
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Abstract
The invention provides a fluorescent lamp abnormal condition protection and sampling circuit, which is characterized in that a sampling choking winding L0 is connected in a ballast series resonant circuit in series, secondary windings n21 and n22 of the sampling choking winding L0 are connected with rectifier diodes D1, D2 to form full-wave rectification, rectified voltage forms a RC filter circuit through a filter capacitor C and a filter resistance R, and the full-wave rectified output voltage abnormally protects actuating voltage through a bidirectional trigger diode D output tube. The invention has the advantages that the circuit can acquire protection signal through the symmetrical sampling lamp voltage rise when pins have poor contact, the lamp tube is not accessed and is not activated, and the non-activated lamp tube or gas-leaked lamp tube is under abnormal state, can extract protection voltage from the risen non-symmetrical voltage wave form when the lamp tube is on the end of the service life (the emitting capacity of one end decreases or the emitting capacities of two ends simultaneously decrease), and is an ideal circuit capable of realizing fully protection of lamp abnormal condition in a half-bridge inverting electronic ballast.
Description
Technical field
The present invention relates to the protection sample circuit of electric ballast fluorescent lamp abnormal condition in a kind of electric lighting, particularly a kind of fluorescent lamp abnormal condition protection and sampling circuit.
Background technology
Fluorescent lamp has become current main lighting source because of luminous efficiency height, energy-conservation and colour temperature may command.Particularly to have color rendering better for tubule footpath fluorescent tube, and light efficiency is advantages of higher more, and caliber is that the T5 of 16mm and tubules such as T4 footpath fluorescent tube that caliber is 12mm have begun to be widely adopted in public with in the domestic lighting.Advantages such as electronic ballast for fluoresent lamp is energy-efficient because of having, comfortable, safety, environmental protection substitute traditional inductance type ballast gradually.
The semi-bridge inversion formula electric ballast that the high pressure that produces for the series resonance of utilizing choke and lamp electric capacity is lighted lamp activating, fluorescent tube in the electric ballast that is connected normal unlatching occurs as the pin loose contact, fluorescent tube does not insert, the fluorescent tube un-activation, during non-activation fluorescent tube abnormalities such as (gas leakage fluorescent tubes), can cause the unusual rising of light tube electric voltage, thereby cause damaging the adverse consequences of electric ballast.
When fluorescent lamp was aging, not only the luminous efficiency of fluorescent tube can decay gradually; Also, cause arc current frequent inconsistent effect in the continuous half period, promptly so-called rectifying effect because of an electrode damage or electronics emission deficiency.Electrode damage of in running order fluorescent tube or electronics emission are not enough, will cause that the electrode temperature of fluorescent tube one end rises rapidly, and extra power loss concentrates in the very little scope in negative electrode front.For caliber is 16 millimeters the T5 and the fluorescent tube in tubule footpath more, because radiating condition is poorer than extra heavy pipe footpath fluorescent tube, fluorescent tube one end overheated may cause the light fixture connector at lamp holder place to burn and the glass tube walls fusing of electrode tip, thereby causes security incident.In addition, the light tube electric voltage that is operated under the rectifying effect state can raise, if ballast continues to keep the discharging current of fluorescent tube, then the power of fluorescent tube will the corresponding rising along with the rising of light tube electric voltage, and it is overheated to have aggravated fluorescent tube.In the last few years; in the safety standard of electric ballast; clearly stipulated for the T5 or the fluorescent lamp ballast in tubule footpath more; must have fluorescent tube end-of-life protection characteristic; promptly when fluorescent tube end-of-life phenomenon occurs; ballast should be able to be controlled at the secondary power of fluorescent tube within the restricted portion, so the lamp tube life end protection has become the abnormal condition of lamp tube state that must consider.In addition, according to domestic electric ballast standard code, all electric ballasts all need the test by rectifying effect, and also relevant detection and protective circuit should be arranged at this abnormality.
Fluorescent lamp abnormal condition protection and sampling circuit is the indispensable part of electric ballast.
In semi-bridge inversion formula electric ballast; according to sampling method, the choke sampling shown in the drawings attached 1, the modulating voltage dividing potential drop sampling shown in the accompanying drawing 2; oscillating tube source electrode sampling shown in the accompanying drawing 3, and the form of the kinds of protect sample circuits such as modulating voltage integration sampling shown in the accompanying drawing 4.
Choke sampling and modulating voltage dividing potential drop sampling method shown in Figure 2 shown in Figure 1 all are that resonance potential raises when directly utilizing the abnormal condition of lamp tube state, extract the signal of half cycle of fluorescent tube high frequency voltage by a diode.For non-activation fluorescent tube, because the light tube electric voltage that occurs raising is symmetrical, the protection sample circuit can provide enough protection operation voltages.When lamp tube life end, modulating voltage presents asymmetric rectifying effect, then might get less than signal; Even or get, sensitivity is also lower.So they are unsuitable for doing the protection of dying of old age of fluorescent tube.
Oscillating tube source electrode sampling protective circuit shown in Figure 3, when the abnormal condition of lamp tube state, the forward and reverse resonance current of initiation all increases, and only when the electric current by oscillating tube increased greatly, sample circuit just had enough output.Therefore also can only be used in protection usually to non-activation fluorescent tube, can not be as the lamp tube life end protection.In addition, in order to reduce excess loss, the source electrode sample resistance of field effect transistor switch pipe can not be used very greatly, and the amplitude of the protection operation voltage that obtains above it also can not be very big, has so also just increased the difficulty that complete machine is adjusted.Therefore, it can only use in the electric ballast of doing to drive with integrated circuit usually.
Modulating voltage integration sample circuit shown in Figure 4, extraction be the integrated value of positive half cycle of modulating voltage and negative half period difference.During the fluorescent tube operate as normal, the electron emissivity of lamp tube ends filament is identical, and the voltage of positive half cycle of light tube electric voltage and negative half period is identical, and difference is zero, and the integrated value on capacitor is zero.When the electron emissivity of a certain end of filament weakens, cause the asymmetric of lamp current, thereby make the voltage of positive half cycle of modulating voltage and negative half period asymmetric, go out this continuous asymmetric difference of positive and negative half period in the capacitor upper integral.This difference just may be, also may be negative.Through an absolute value amplifier, convert suitable protection operation voltage output to.But, when the emissivities of the two ends of lamp filament all descend, though lamp current descends; modulating voltage raises; because of the asymmetric degree of continuous positive and negative half period is not aggravated, possible integration can not in time play a protective role less than enough difference voltage on the capacitor.As a same reason, this method also can not be protected the non-activation lamp tube status that light tube electric voltage presents half cycle rising, positive and negative half period waveform symmetry.
Existing semi-bridge inversion formula electric ballast abnormal condition of lamp tube protection sample circuit; especially after the requirement that proposes the lamp tube life end protection; how to take into account the effective protection of realization, become field for this reason to fall over each other the problem of discussing in the industry various abnormalities with fairly simple a kind of abnormality sample circuit.
Summary of the invention
Technical problem to be solved by this invention be to provide a kind of overcome in the prior art half-bridge contravariant electronic ballast for fluoresent lamp is difficult to take into account effective protection to various abnormal condition of lamp tube states with a kind of circuit, a kind of protection sample circuit that can tackle various abnormal condition of lamp tube states of choke all-wave sampling is proposed.Sort circuit not only can be in the luminous tube pin loose contact, fluorescent tube does not insert, fluorescent tube un-activation or when connecting non-activation fluorescent tube abnormalities such as (gas leakage fluorescent tubes), light tube electric voltage height during than the fluorescent tube normal condition, and positive and negative half cycle waveform is under the situation of symmetry, and the protection sample circuit can both be exported enough protection operation voltages; And, when light tube electric voltage presents the asymmetric rectifying effect of positive and negative at random half cycle, can obtain and export enough protection operation voltages equally at lamp tube life end.
In order to solve above technical problem; the invention provides a kind of fluorescent lamp abnormal condition protection and sampling circuit; a sampling of serial connection choking-winding L0 in the ballast series resonant circuit; sampling choking-winding L0 comprises two secondary winding n21 and n22; the secondary winding n21 of sampling choking-winding L0 and n22 and rectifier diode D1, D2 connect and compose full-wave rectification; voltage constitutes the RC filter circuit through filter capacitor C, filter resistance R after the rectification, and the voltage of full-wave rectification output is through bidirectional trigger diode D output abnormal condition of lamp tube protection operation voltage.
The part that the elementary winding n1 of described sampling choking-winding L0 is the resonant inductance in the ballast series resonant circuit.
The secondary winding n21 of described sampling choking-winding L0 and n22 take a sample to sampling choking-winding L0 under certain condition of resonance.When the fluorescent tube operate as normal, fluorescent tube is that parallel connection is linked in the resonant circuit C0 two ends as load; When fluorescent tube was in abnormality, the load resistance that is connected in parallel on the capacitor C 0 became big, and the Q value on the resonant tank increases, and the voltage on sampling choking-winding L0 and the C0 will take place significantly to change, and secondary winding n21 and n22 have also just reacted the state of abnormal condition of lamp tube.At above-mentioned two diode D1 and the negative pole of D2 and the common node of resistance R and capacitor C
On the direct voltage Ua that obtains be required sampling voltage.When the abnormal condition of lamp tube state, sampling voltage Ua is through bidirectional trigger diode D output protection operation voltage, and the interlock circuit of control ballast quits work ballast.
The changing voltage of described bidirectional trigger diode D is set at threshold voltage Ut; the magnitude of voltage Ua that exports when sampling choking-winding L0 secondary winding full-wave rectifying circuit is higher than threshold voltage Ut, and abnormal condition of lamp tube protection operation voltage is also exported in bidirectional trigger diode D conducting.
When the fluorescent tube normal operating conditions, sampling voltage Ua waveform is shown in Fig. 6 a, can draw, light tube electric voltage keeps normal value, and waveform is near sinusoidal wave, full-wave rectification output voltage U a (n) is lower than the threshold voltage Ut with described bidirectional trigger diode D, and setting full-wave rectification output voltage U a (n) is 2/3rds of threshold voltage Ut.This moment, bidirectional trigger diode ended, the output of unprotect operation voltage.
In the fluorescent tube un-activation or connect non-activation fluorescent tube or gas leakage during fluorescent tube, the resonance potential amplitude at ballast resonant capacitor C0 two ends can increase by two to three times even bigger in moment.Will be from the voltage U a (a) of sampled signal after described diode D1 and D2 full-wave rectification that two secondary winding n21 and the n22 of described sampling choking-winding L0 obtains above preset threshold voltage U t; it is the changing voltage of described bidirectional trigger diode D; described bidirectional trigger diode D conducting, the output protection operation voltage.This moment protective circuit on the sampling voltage waveform shown in Fig. 6 b.
When the abnormality of the lamp tube life end that rectifying effect occurs, the resonance potential amplitude of half period increases with the reduction of the emissivities of an end filament, and the resonance potential of half period does not change in addition, and the resonance potential of these two half period has been formed jointly
The point current potential.Thereby no matter be the emissivities reduction of a filament, still the emissivities of two filaments at two ends all reduce, in described full-wave rectifier circuit, the commutating voltage Ua (n) when abnormality commutating voltage Ua (a) will be than the fluorescent tube normal condition has rising by a relatively large margin.As long as commutating voltage Ua surpasses preset threshold voltage U t, described bidirectional trigger diode D conducting just has the output of protection operation voltage.
Superior effect of the present invention is: sample circuit of the present invention not only can be in the pin loose contact, fluorescent tube does not insert, the fluorescent tube un-activation during abnormalities such as non-activation fluorescent tube or gas leakage fluorescent tube, relies on the modulating voltage rising of sampling symmetry and obtains the protection actuating signal; Can also be when lamp tube life end; no matter which end emissivities of fluorescent tube reduce or two ends filament emissivities reduce simultaneously; can both from the asymmetrical voltage waveform that raises, reliable extraction be a kind of ideal circuit that in semi-bridge inversion formula electric ballast, realizes abnormal condition of lamp tube state full guard to the protection operation voltage.
The number in the figure explanation
Accompanying drawing 1 is choking-winding sample circuit figure;
Accompanying drawing 2 is modulating voltage pressure sampling circuit figure;
Accompanying drawing 3 is oscillating tube source electrode sample circuit figure;
Accompanying drawing 4 is modulating voltage integration sample circuit figure;
Accompanying drawing 5 is choking-winding all-wave sample circuit figure of the present invention;
Accompanying drawing 6 (comprising Fig. 6 a and Fig. 6 b) is a choke all-wave sampling voltage oscillogram of the present invention;
The number in the figure explanation
1-semi-bridge inversion drive circuit; D1, D2-rectifier diode;
2-abnormal protection sample circuit; The D-diac;
The Lamp-fluorescent tube; C1, C2-series resonant tank electric capacity
The L-resonant inductance; The C0-resonant capacitance;
The L0-choke of taking a sample; The C-filter capacitor;
The elementary winding of n1-sampling choking-winding; The Ca-partiting dc capacitor
N21, n22-sampling choking-winding secondary winding;
R1, R2-switching tube emitter-base bandgap grading/source resistance;
Q1, Q2-half-bridge inverter switching tube;
Ra, the Rb-divider resistance; The R-filter resistance.
Embodiment
See also shown in the accompanying drawing, the invention will be further described.
As shown in Figure 5; the invention provides a kind of fluorescent lamp abnormal condition protection and sampling circuit, this sample circuit comprises the sampling choking-winding L0 that is connected in series in the series resonant circuit, full-wave rectification diode D1 and D2; filter capacitor C, filter resistance R and bidirectional trigger diode D.The elementary winding n1 of described sampling choking-winding L0 is connected in series between resonant inductance L and the fluorescent tube Lamp in parallel with resonant capacitance C0, obtains the light tube electric voltage signal from secondary winding n21 and the n22 of described sampling choking-winding L0.The anode of described rectifier diode D1 and D2 connects secondary winding n21 and n22 one end of described sampling choking-winding L0 respectively, the public electronegative potential point Gnd of the secondary winding n21 of described sampling choking-winding L0 and the other end connection circuit of n22, the negative electrode of described rectifier diode D1 and D2 and described filter capacitor C, each end of filter resistance R is at common point
On be connected together mutually.Common point
Also be connected with the end of bidirectional trigger diode D.The changing voltage of selected described bidirectional trigger diode D is threshold voltage Ut.At common point
On, by described full-wave rectifying circuit the ballast fluorescent tube high-frequency voltage signal that obtains is carried out full-wave rectification and obtain voltage U a.Commutating voltage Ua (n) when the fluorescent tube normal condition is set is about 2/3rds for set threshold voltage Ut's, shown in Fig. 6 a.Therefore, when the fluorescent tube normal condition, Ua (n) is less than Ut, and described bidirectional trigger diode D ends, and no abnormal protection operation voltage is exported through described bidirectional trigger diode D.When the abnormal condition of lamp tube state, no matter positive and negative half cycle symmetry of high-frequency lamp voltage or asymmetric increasing appear, at common point
The sampling voltage Ua that last rectification obtains (a) all can be far above preset threshold voltage U t; shown in Fig. 6 b, described bidirectional trigger diode D conducting, output protection operation voltage; the interlock circuit of control ballast quits work ballast when the abnormal condition of lamp tube state.
Claims (3)
1. fluorescent lamp abnormal condition protection and sampling circuit; it is characterized in that: a sampling of serial connection choking-winding L0 in the ballast series resonant circuit; sampling choking-winding L0 comprises two secondary winding n21 and n22; the secondary winding n21 of sampling choking-winding L0 and n22 and rectifier diode D1, D2 connect and compose full-wave rectification; voltage constitutes the RC filter circuit through filter capacitor C, filter resistance R after the rectification, and the voltage of full-wave rectification output is through bidirectional trigger diode D output abnormal condition of lamp tube protection operation voltage.
2. by the described fluorescent lamp abnormal condition protection and sampling circuit of claim 1, it is characterized in that:
The part that the elementary winding n1 of described sampling choking-winding L0 is the resonant inductance in the ballast series resonant circuit.
3. by the described fluorescent lamp abnormal condition protection and sampling circuit of claim 1, it is characterized in that:
The changing voltage of described bidirectional trigger diode D is set at threshold voltage Ut, and the magnitude of voltage Ua of sampling choking-winding L0 secondary winding full-wave rectifying circuit output is higher than threshold voltage Ut, and bidirectional trigger diode D conducting is also exported abnormal condition of lamp tube protection operation voltage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010105895.7A CN101754551B (en) | 2010-02-04 | 2010-02-04 | Fluorescent lamp abnormal condition protection and sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010105895.7A CN101754551B (en) | 2010-02-04 | 2010-02-04 | Fluorescent lamp abnormal condition protection and sampling circuit |
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| Publication Number | Publication Date |
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| CN101754551A true CN101754551A (en) | 2010-06-23 |
| CN101754551B CN101754551B (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010105895.7A Active CN101754551B (en) | 2010-02-04 | 2010-02-04 | Fluorescent lamp abnormal condition protection and sampling circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848586A (en) * | 2010-06-24 | 2010-09-29 | 上海阿卡得电子有限公司 | Arc suppressing circuit of electronic ballast output end |
| CN102624325A (en) * | 2011-01-26 | 2012-08-01 | 洛克威尔自动控制技术股份有限公司 | Choke with current sensor |
| CN108594100A (en) * | 2018-02-08 | 2018-09-28 | 福建睿能科技股份有限公司 | The detection circuit and electric light of electric light lamp tube service life |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2609318Y (en) * | 2003-03-26 | 2004-03-31 | 上海日升电业有限公司 | Electronic transformer for low voltage lamp |
| CN2712044Y (en) * | 2004-06-10 | 2005-07-20 | 陈钢 | Electronic ballast for fluorescent |
| CN201039565Y (en) * | 2007-04-24 | 2008-03-19 | 樊贤信 | Electronic rectifier for non electrolysis capacitance and long life fluorescent lamp |
| CN201601884U (en) * | 2010-02-04 | 2010-10-06 | 上海阿卡得电子有限公司 | Novel protection sample circuit for fluorescent lamp abnormal condition |
-
2010
- 2010-02-04 CN CN201010105895.7A patent/CN101754551B/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848586A (en) * | 2010-06-24 | 2010-09-29 | 上海阿卡得电子有限公司 | Arc suppressing circuit of electronic ballast output end |
| CN101848586B (en) * | 2010-06-24 | 2013-09-18 | 上海阿卡得电子有限公司 | Arc suppressing circuit of electronic ballast output end |
| CN102624325A (en) * | 2011-01-26 | 2012-08-01 | 洛克威尔自动控制技术股份有限公司 | Choke with current sensor |
| CN102624325B (en) * | 2011-01-26 | 2014-12-10 | 洛克威尔自动控制技术股份有限公司 | Motor drive system, detection method of ground faults, and common mode choker system |
| CN108594100A (en) * | 2018-02-08 | 2018-09-28 | 福建睿能科技股份有限公司 | The detection circuit and electric light of electric light lamp tube service life |
| CN108594100B (en) * | 2018-02-08 | 2020-08-11 | 福建睿能科技股份有限公司 | Lamp tube life detection circuit of electric lamp and electric lamp |
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|---|---|
| CN101754551B (en) | 2014-12-24 |
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