CN101287322A - Preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast - Google Patents
Preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast Download PDFInfo
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- CN101287322A CN101287322A CNA2007100212221A CN200710021222A CN101287322A CN 101287322 A CN101287322 A CN 101287322A CN A2007100212221 A CNA2007100212221 A CN A2007100212221A CN 200710021222 A CN200710021222 A CN 200710021222A CN 101287322 A CN101287322 A CN 101287322A
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- preheating
- starting circuit
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- fluorescent tube
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Abstract
The invention relates to a preheating starting circuit of fluorescent lights based on self-excited type electronic ballasts, which comprises a fluorescent light tube, a half-bridge drive circuit, a ballasting inductor which is connected between the fluorescent light tube and the half-bridge drive circuit in series, and a resonant capacitor which is connected between lamp filaments at both ends of the fluorescent light tube in parallel. The resonant capacitor is connected with the ballasting inductor by the lamp filaments at one end of the fluorescent light tube in series. The preheating starting circuit of the invention also comprises a level top element which is connected between the lamp filaments at both ends of the fluorescent light tube in parallel and at the same time the resonant capacitor is also connected with the lamp filaments in parallel. The level top is a pair of metal sheets which consist of a straight type electrode and a U-shaped bimetallic electrode with different coefficients of expansion. The preheating starting circuit of the invention has the advantage of stable and reliable preheating starting of the fluorescent lights and meets the requirements of the consistency and the interchangeability of the fluorescent light.
Description
Technical field
The invention belongs to preheating and starting circuit of florescent lamp, particularly a kind of preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast.
Background technology
High performance auto-excitation type electric ballast requires fluorescent tube to provide enough warm-up time of the filament pre-heating electric current that meets the fluorescent tube standard-required and 0.4-2 second to tube cathode before triggering, make filament reach the desired suitable temperature of emitting electrons (950-1000) ° K, trigger that then lamp is lighted.
The preheat circuit of fluorescent lamp is filament " current-mode " preheat circuit that a kind of widely popular thermistor PTC forms as shown in Figure 1 at present.Though sort circuit electronic component integrated level is good, utilize thermistor PTC pipeline start up by preheating to have following problem:
1) consistency is poor, lost efficacy easily: facts have proved that thermistor PTC preheat curent and warm-up time consistency when producing in batches is relatively poor, can not reach satisfied effect, special task is after a period of time, the PTC resistive performance is aging, makes pre-hot property generation significant change, and PTC resistance power consumption increases, cause to burn out and burst, product reliability is descended.
2) fluorescent tube interchangeability is relatively poor: thermistor PTC pipeline start up by preheating requires high to the fluorescent tube consistency of performance, changes the same model fluorescent tube of different factories, often makes the preheating performance change, does not reach pre-heat effect, and the serious lamp tube service life that makes descends.
Summary of the invention
In order to remedy above deficiency, the invention provides the reliable and stable preheating and starting circuit of florescent lamp of a kind of pipeline start up by preheating based on auto-excitation type electric ballast.
Technical scheme of the present invention is such realization: a kind of preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast, comprise fluorescent tube, half-bridge drive circuit, be series at the ballast inductance between this fluorescent tube and this half-bridge drive circuit and be parallel to resonant capacitance between this fluorescent tube two ends filament, this resonant capacitance is connected in series by filament and this ballast inductance of this fluorescent lamp one end, this preheating and starting circuit of florescent lamp also comprises and this resonant capacitance is parallel to flat bubble element between this fluorescent tube two ends filament simultaneously, the pair of metal sheet that this flat bubble element is made up of a straight type electrode and a U type bimetallic electrode with different coefficients of expansion.
Should flatly steep element for to form with a U type bimetallic electrode with different coefficients of expansion by a straight type electrode, should have and common flat bubble characteristic inequality by flat bubble element: first impulse duration after connecting voltage, should flatly steep element glow discharge and make the U-shaped bimetallic electrode obtain enough heats and extensional deformation, the result of distortion connects the two poles of the earth.After this pulse voltage is more and more littler, and the duration is shorter and shorter.Therefore guarantee that preheat curent and warm-up time are more reliable and more stable, are suitable for product lot quantity production.
Description of drawings
Fig. 1 is a fluorescent lamp pipeline start up by preheating device circuit block diagram of the prior art;
Fig. 2 is for adopting preheating and starting circuit of florescent lamp block diagram of the present invention;
Fig. 3 is the structural representation of described flat bubble element;
The characteristic schematic diagram that Fig. 4 should possess for the fluorescent lamp pipeline start up by preheating;
Fig. 5 is the actual fluorescent lamp pipeline start up by preheating characteristic schematic diagram that records among the embodiment.
Embodiment
Below in conjunction with Fig. 2 and Fig. 3, be further described:
A kind of preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast, comprise fluorescent tube, half-bridge drive circuit, be series at the ballast inductance L between this fluorescent tube and this half-bridge drive circuit and be parallel to resonant capacitance C between this fluorescent tube two ends filament, this resonant capacitance C is connected in series by filament and this ballast inductance L of this fluorescent lamp one end, this preheating and starting circuit of florescent lamp also comprises and this resonant capacitance C is parallel to flat bubble element between this fluorescent tube two ends filament simultaneously, the pair of metal sheet that this flat bubble element is made up of a straight type electrode and a U type bimetallic electrode with different coefficients of expansion.
The pipeline start up by preheating of electric ballast should satisfy starting characteristic shown in Figure 4 just can reach pre-heat effect preferably, and as can be known from Fig. 4: 1, between Δ t warming up period, should meet the warm-up time of stipulating in the fluorescent tube standard its warm-up time; 2, between Δ t warming up period, the size of its preheat curent should meet the temperature that setting in the fluorescent tube standard just reaches emitting electrons; 3, between Δ t warming up period, the tube voltage of its fluorescent tube should be enough low, to prevent the injury of sputters such as glow discharge and hard reboot to filament; 4, preheating finishes, and when fluorescent tube entered normal operating condition, heater current should be enough little, to reduce plate loss.To satisfy above-mentioned preheating requirement simultaneously for auto-excitation type electric ballast, almost be difficult to.
Use the present invention, after Fig. 2 connection, 12 T8/28W fluorescent lamps are carried out the ON/OFF test, accumulative total ON/OFF number of times reaches more than 43000 time, also no abnormal result, as need not as described in flat bubble element, accumulative total ON/OFF test can only be experienced 10000 left and right sides filaments and just damage, and gets 50 continuous ON/OFF tests of T8/28W lamp 2000 times simultaneously, all obtain satisfied result, as shown in Figure 5, utilize HB-5A electric ballast performance evaluation instrument, the actual pipeline start up by preheating characteristic that records on the T8/28W electric ballast.Therefore adopt the present invention to be applied to the filament pre-heating startup life-span of improving fluorescent tube is played obvious effects.
Claims (1)
1, a kind of preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast, comprise fluorescent tube, half-bridge drive circuit, be series at the ballast inductance (L) between this fluorescent tube and this half-bridge drive circuit and be parallel to resonant capacitance (C) between this fluorescent tube two ends filament, this resonant capacitance (C) is connected in series by filament and this ballast inductance (L) of this fluorescent lamp one end, it is characterized in that, this preheating and starting circuit of florescent lamp also comprises and this resonant capacitance (C) is parallel to flat bubble element between this fluorescent tube two ends filament simultaneously, the pair of metal sheet that this flat bubble element is made up of a straight type electrode and a U type bimetallic electrode with different coefficients of expansion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100212221A CN101287322A (en) | 2007-04-13 | 2007-04-13 | Preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100212221A CN101287322A (en) | 2007-04-13 | 2007-04-13 | Preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101287322A true CN101287322A (en) | 2008-10-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100212221A Pending CN101287322A (en) | 2007-04-13 | 2007-04-13 | Preheating and starting circuit of florescent lamp based on auto-excitation type electric ballast |
Country Status (1)
| Country | Link |
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| CN (1) | CN101287322A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892246A (en) * | 2011-07-18 | 2013-01-23 | 台达电子企业管理（上海）有限公司 | Discharge lamp system and control method thereof |
-
2007
- 2007-04-13 CN CNA2007100212221A patent/CN101287322A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102892246A (en) * | 2011-07-18 | 2013-01-23 | 台达电子企业管理（上海）有限公司 | Discharge lamp system and control method thereof |
| US9131588B2 (en) | 2011-07-18 | 2015-09-08 | Delta Electronics (Shanghai) Co., Ltd. | Discharge lamp system and controlling method of the same |
| CN102892246B (en) * | 2011-07-18 | 2016-01-27 | 台达电子企业管理（上海）有限公司 | Discharge lamp system and control method thereof |
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Application publication date: 20081015 |