CN2171191Y - Electronic ballast for fluorescent lamp - Google Patents
Electronic ballast for fluorescent lamp Download PDFInfo
- Publication number
- CN2171191Y CN2171191Y CN 93243888 CN93243888U CN2171191Y CN 2171191 Y CN2171191 Y CN 2171191Y CN 93243888 CN93243888 CN 93243888 CN 93243888 U CN93243888 U CN 93243888U CN 2171191 Y CN2171191 Y CN 2171191Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- triode
- coil
- driving
- electronic ballast
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
The utility model relates to an electronic ballast for fluorescent lamps, belonging to the technical field of electric illumination uncovered by other classes. The electronic ballast is composed of an input filtering protection circuit, a rectifying filtering circuit, a power switch circuit, a driving and protection circuit and a filament load circuit. In the driving and protection circuit, two large volume capacitors C2, C3 are added based on a self-excited oscillation circuit. Making use of the power storage method of the capacitors, the switch time of a triode is widened. As the saturated process of the charging of the capacitors, slow start is realized. Meanwhile, the method of driving a choking integration penta-coil nonsaturnated transformer B2 is adopted. Thus, when the fluorescent lamps are switched on, the phenomena of surge current and cathode sputter are effectively prevented. The service life of the electronic ballast is guaranteed, and the service life of the luminous tubes is prolonged.
Description
The utility model belongs to other class electric lighting field not to be covered, especially a kind of electric ballast that is used for fluorescent lamp.
At present, the electronic ballast for fluoresent lamp of domestic and international existing multiple model, generally be by current rectifying and wave filtering circuit, the sawtooth waveforms circuits for triggering, the three-winding drive circuit, power switch circuit, choke circuit, several parts of load filament loop are formed, though they have energy-conservation, noiselessness, but characteristics such as low-voltage startup, but also exist simultaneously because the lamp tube ends blackout that starter causes rapidly, shortcomings such as lamp tube service life reduction, in addition, two switch triodes in the existing electric ballast are because multiple factor is easy to generate second breakdown and series connection conducting phenomenon, its stability and reliability are reduced, shortened the useful life of electric ballast.
The purpose of this utility model be to provide a kind of reasonable in design, functional reliability strong, the electric ballast of good energy-conserving effect, fluorescent lamp that cost is low.
The purpose of this utility model reaches by following measure: this electric ballast is made up of input filter protective circuit, current rectifying and wave filtering circuit, power switch circuit, driving and protective circuit and filament load circuit; in driving and protective circuit; abandoned the saw-tooth wave generating circuit that constitutes by diac; what adopt is on the basis of self-maintained circuit, adds two large bulk capacitance C
2And C
3, capacitor C
2Be connected on triode V
01Excitation coil n
3And n
4Between, capacitor C
3Be connected on triode V
02Emitter and its excitation coil n
6Between, form by resistance R
1, coil n
3, capacitor C
2And R
4, n
6, C
3The triode V that forms
01And V
02The drive circuit of series connection vibration energy storage form, this drive circuit utilizes the mode of capacitor-discharge to widen the ON time of triode, and along with the charging saturation history of electric capacity, has realized slow startup; In addition, in driving and protective circuit, the integrated five coil unsaturated transformer B of driving chokes have also been adopted
2, be about to oscillatory feedback coil and choking-winding together, except traditional n with same backbone winding
3, n
6, n
7Outside the three-winding, increased n
4, n
5Coil, wherein n
4, n
5, n
7The end of the same name of coil links to each other, and the different name end is connected on triode V respectively
01Emitter, V
02Collector electrode and an end of filament, n
4, n
5The polarity of coil is opposite, goes here and there respectively in the work loop of two triodes, has prevented that not only electric current flows through triode V simultaneously in the same way
01And V
02, and, strengthened reliability because ending of another triode quickened in the existence of anti-phase electromotive force, reduced energy consumption.
Electric ballast by the such scheme manufacturing, owing to adopted the drive circuit of vibration energy storage form, surge current and cathodic sputtering phenomenon when fluorescent lamp is turned on light have been overcome effectively, simultaneously owing to adopted integrated five coil transformers of driving chokes, its functional reliability is strengthened, can guarantee its useful life and prolonging lamp tube service life, but this electric ballast also have advantages such as compact conformation, reasonable in design, good energy-conserving effect, the low low-voltage startup of cost.
Accompanying drawing is an embodiment circuit diagram of the present utility model.
The utility model is described in further detail below in conjunction with drawings and Examples:
As shown in the figure, this electric ballast is by fuse F, high frequency filter B
1Form the input filter protective circuit, by rectifier bridge V
1-4, capacitor C
1Form current rectifying and wave filtering circuit, by triode V
01, V
02 form power switch circuit, by resistance R
1To R
6, diode V
5, V
6, capacitor C
5, C
2, C
3And transformer B
2Form driving and protective circuit, by capacitor C
4, C
6, coil n
7Form the filament load circuit.In driving and protective circuit; different with the existing drive circuit of using always is not adopt the saw-tooth wave generating circuit that is made of diac; this circuit instantaneous trigger starts, and filament fails to give heat, easily causes the cold conditions sputter of filament metal; turned black in early days in fluorescent tube end two ends; this circuit causes continuous trigger when clamping diode damages in addition, and switch triode series connection conducting is burnt; so the utility model has adopted in self-maintained circuit, add two large bulk capacitance C
2And C
3, capacitor C
2Be connected on triode V
01Excitation coil n
3And n
4Between, capacitor C
3Be connected on triode V
02Emitter and its excitation coil n
6Between, form by resistance R
1, coil n
3, capacitor C
2And R
4, n
6, C
3The triode V that forms
01And V
02The drive circuit of series connection vibration energy storage form, in the drive circuit of this energy storage form, n
3, n
6The induced voltage that provides directly puts on capacitor C
2And C
3On, being fit to the required store energy of excitation in electric capacity, the ON time of utilizing the mode of capacitor-discharge to widen triode, and along with the charging saturation history of electric capacity, realize slowly starting, thereby the fail safe of triode and lamp works is strengthened, energy consumption further reduces.In addition, in driving and protective circuit, the integrated five coil unsaturated transformer B of driving chokes have also been adopted
2, be about to oscillatory feedback coil and choking-winding together, except traditional n with same backbone winding
3, n
6, n
7Outside the three-winding, increased n
4, n
5Coil, wherein n
4, n
5, n
7The end of the same name of coil links to each other, and the different name end is connected on triode V respectively
01Emitter, V
02Collector electrode and an end of filament, n
4, n
5The polarity of coil is opposite, goes here and there respectively in the work loop of two triodes, has prevented that not only electric current flows through triode V simultaneously in the same way
01And V
02, and because ending of another triode quickened in the existence of anti-phase electromotive force, make the trailing edge of waveform steeper, reduced the loss of triode, temperature rise descends, energy consumption decreases, the stability of triode and reliability strengthen, simultaneously, owing to adopted integrated five coil transformers of driving chokes, saved the vibration magnet ring, thereby reduced cost, the volume of whole ballast also dwindles thereupon, is easier to promote.
In addition, two switch triodes of this electric ballast are fastened on the metal shell, utilize metal shell to make radiator, save heating panel, and simultaneously, this shell also plays shielding action, and the interference that electric ballast is produced reduces greatly.
The operation principle of this electric ballast can be sketched and be: after civil power 220V connects, through fuse F and high frequency filter B
1After the filtering, add to rectifier bridge V
1-4Two ends are through rectification and C
1After the filtering, the A point obtains the working power of about 300V direct voltage as electric ballast, triode V during beginning
01, V
02All end, 300V voltage is through R
2, n
3, C
2, n
4, n
5, R
5, n
6, C
3Series arm is respectively to C
2, C
3Charging is because R
5, n
6, C
3C in parallel on the branch road
5, make U
BC>U
AB, promptly As time goes on, C
3The two ends charging makes its both end voltage rate of climb greater than C
2The speed that both end voltage rises is worked as C
3Both end voltage is greater than V
02Cut-ff voltage the time, V
02At first conducting, electric current is through C
4, filament, C
6, n
7, n
5, V
02Form the loop, filament is given heat, because transformer B
2Coupling, coil n
7The induced potential of last generation is coupling in n
6End of the same name on, make V
02Enter the saturation conduction state rapidly, simultaneously also because n
3, n
4Induced potential opposite, make V
01Keep cut-off state, n
4Existence make V
01That ends is rapider thorough, more As time goes on, and by C
4, C
6, n
7, n
5The series resonant tank electric current that constitutes reduces gradually, and charging process finishes, at this moment n
6The undertension of last induction is with excitation V
02, V
02Begin to end, because B
2Coupling, n
3On produced and n
6Opposite voltage makes V
01Enter conducting state, by C
4, C
6, n
7, n
4The series resonant circuit that constitutes passes through V
01Discharge, n
5Existence make V
02That ends is rapider thorough, works as n
3Induced voltage be not enough to encourage V
01The time, V
01End.n
5On anti-phase induced voltage make V
02Conducting, circulation forms stable oscillation stationary vibration so repeatedly, at V
01Emitter, V
02Collector electrode output high frequency square wave, fluorescent tube is connected on this by C
4, C
6, n
7In the series resonant circuit that constitutes, before starter not, C
6Two ends produce higher resonance potential, and filament flows through and gives thermocurrent, tube starting under both actings in conjunction, n behind the starter
7Playing ballast does in order to stablize the operating current of fluorescent tube, C
6As bypass High-frequency Interference and the radiation that prevents noise.In addition, by R
3, V
5And R
6, V
6Constitute V respectively
01And V
02Protective circuit, give n respectively
3, C
2And n
6, C
3Reverse continuous current circuit is provided, has also avoided peak-inverse voltage to V simultaneously
01, V
02The infringement that emitter junction causes, capacitor C
5Except that above-mentioned startup effect, work as V
02When ending, also play and avoid too high voltages to make it to puncture, protection triode V
02Effect.
Claims (2)
1, a kind of electronic ballast for fluoresent lamp; it is made up of input filter protective circuit, current rectifying and wave filtering circuit, power switch circuit, driving and protective circuit and filament load circuit; it is characterized in that in driving and the protective circuit; what adopt is on the basis of self-maintained circuit, adds two large bulk capacitance C
2, C
3, capacitor C
2Be connected on triode V
01Excitation coil n
3And n
4Between, capacitor C
3Be connected on triode V
02Emitter and its excitation coil n
6Between, form by R
1, n
3, C
2And R
4, n
6, C
3The triode V that forms
01And V
02The drive circuit of series connection vibration energy storage form; In addition, the integrated five coil unsaturated transformer B of driving chokes have also been adopted
2, be about to oscillatory feedback coil and choking-winding together, except traditional n with same backbone winding
3, n
6, n
7Outside the three-winding, increased n
4, n
5Coil, wherein n
4, n
5, n
7The end of the same name of coil links to each other, and the different name end is connected on triode V respectively
01Emitter, V
02Collector electrode and an end of filament.
2, electric ballast according to claim 1 is characterized in that two switch triode V
01, V
02Be fastened on the metal shell, utilize it to make radiator, save heating panel, simultaneously, this shell also plays shielding action.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 93243888 CN2171191Y (en) | 1993-11-03 | 1993-11-03 | Electronic ballast for fluorescent lamp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 93243888 CN2171191Y (en) | 1993-11-03 | 1993-11-03 | Electronic ballast for fluorescent lamp |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2171191Y true CN2171191Y (en) | 1994-07-06 |
Family
ID=33817235
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 93243888 Expired - Fee Related CN2171191Y (en) | 1993-11-03 | 1993-11-03 | Electronic ballast for fluorescent lamp |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN2171191Y (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1874637B (en) * | 2006-05-19 | 2011-01-12 | 徐建光 | Electronic ballast in use for gas discharge lamp |
-
1993
- 1993-11-03 CN CN 93243888 patent/CN2171191Y/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1874637B (en) * | 2006-05-19 | 2011-01-12 | 徐建光 | Electronic ballast in use for gas discharge lamp |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |