CN1266986C - Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost - Google Patents
Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost Download PDFInfo
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- CN1266986C CN1266986C CN 01125092 CN01125092A CN1266986C CN 1266986 C CN1266986 C CN 1266986C CN 01125092 CN01125092 CN 01125092 CN 01125092 A CN01125092 A CN 01125092A CN 1266986 C CN1266986 C CN 1266986C
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- filament
- transformer
- circuit
- branch road
- series
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Abstract
The present invention relates to an electronic switching filament preheating circuit of a fluorescent lamp ballast, which is connected between a bridge type inverter circuit of the ballast and a fluorescent lamp. The present invention is characterized in that the electronic switching filament preheating circuit comprises three parallel branch circuits, wherein the first branch circuit is the primary winding NT2 of a filament transformer T2; a diode D1 is connected in series with a resistor R1 and is connected in series with a parallel branch circuit of a resistor R2 and a capacitor C2 to form the second branch circuit; the third branch circuit is composed of two-way controlled silicon SCR, wherein a contact between the two resistors R1 and R2 in the second branch circuit is connected in series with a resistor R4 by a trigger diode D2 and is connected with the triggering end of the controlled silicon SCR; each secondary winding of the transformer T2 of the first branch circuit is connected to both ends of the filament of the fluorescent lamp. The present invention can guarantee that the filament is sufficiently preheated and greatly prolong the service life of the fluorescent lamp; simultaneously, after the strip lamp is lighted, power consumption on the filament is cut, and thus, the present invention effectively improves the grade of the energy consumption of the ballast.
Description
Technical field
The present invention relates to fluorescent lamp ballast, specifically, relate to filament pre-heating and startup in the electronic ballast for fluoresent lamp.
Background technology
Fig. 1 is a kind of by transistor Q
1, Q
2, capacitor C
1, C
3, C
4Transformer T
1, T
3The local electrical schematic diagram of the electronic ballast for fluoresent lamp of the transformer isolation output of forming.This ballast after energising, transformer T
1The voltage that secondary Filament Winding and high pressure winding are responded to heats the filament of fluorescent lamp immediately, and high pressure is with lamp tube starting simultaneously.Its shortcoming of the mode of lighting a lamp like this is: 1, and filament can not obtain sufficient preheating, thereby influences the useful life of fluorescent tube.2, after fluorescent tube was lighted, its filament was in heated condition always, and this part accounts for the electricity of illuminator power consumption 5～10%, was consumed with the form of heat, caused waste of electric energy.
The filament as shown in Figure 4 and the voltage and current waveform of lamp tube ends, wherein, t represents time shaft, every lattice 0.1s.
As can be seen, warm-up time is insufficient among the figure, is 0.15s.After lamp was lighted, the filament power supply was not cut off, and electric energy is consumed with the form of heat, causes waste of electric energy.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned ballast to the filament pre-heating deficiency, provide a kind of advantages of simplicity and high efficiency to be used for the filament pre-heating of electronic ballast for fluoresent lamp and the circuit of startup, fluorescent lifetime is prolonged greatly, can effectively improve the energy consumption grade of ballast again.
A kind of Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost provided by the present invention, it is connected between ballast bridge inverter main circuit and the fluorescent tube, is characterized in, and it comprises three parallel branches: article one branch road is filament transformer T
2Elementary N
T2The second branch road is by diode D
1With first resistance R
1After the series connection, second resistance R of connecting again
2Constitute with the parallel branch of capacitor C2; Article three, branch road is to be made of bidirectional triode thyristor SCR.Wherein, two resistance R in described second branch road
1, R
2Between contact by diac D
2Series resistance R
4After, link to each other with the controllable silicon SCR trigger end; The transformer T of described first branch road
2Secondary each winding be connected the filament two ends of fluorescent tube; It also comprises a transformer T who is in series with described three parallel branches
1, this transformer T
1Elementary N
T1With filament transformer T
2Elementary N
T2Constitute tandem-type connection.
Above-mentioned Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost wherein, also can be connected in series damping resistance R in first branch road
3, the glow current when starting to suppress fluorescent tube.
Above-mentioned Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost, its another kind of connection is transformer T
1Elementary winding N
T1Centre tap connects on described second, third parallel branch, when lamp tube starting is worked, to filament transformer T
2, the controllable silicon closed circuit provides the energy, makes transformer T
2Secondary N '
T2Keep a certain amount of filament voltage, satisfy the instructions for use of some special lamp tubes.
Above-mentioned technical solution by fluorescent tube filament is preheated fully, makes it in the time, be heated to desirable hot cold resistance ratio to filament at the voltage (electric current) of fluorescent tube properties specify, and fluorescent lifetime is prolonged.After preheating finishes, the SCR conducting that is triggered, T2 is by short circuit, and along with circuit is switched, the voltage instantaneous at the two ends of fluorescent tube rises, and makes lamp tube starting.Almost at the same time, the pre-thermal voltage that former T2 level adds on the filament disappears thereupon, thereby has saved fluorescent lamp by the filament power consumption after lighting, and effectively improves the energy consumption grade of ballast.The present invention is a kind of electronic ballast electronics filament-switching preheat circuit that is used for fluorescent lamp, and it can be finished fluorescent lamp effectively and be preheating to start-up course.
Description of drawings
Fig. 1 is that the existing ballast bridge inverter main circuit is connected the local electrical interconnection figure on the fluorescent tube;
Fig. 2 is the electrical interconnection figure that filament preheating circuit of the present invention is connected a kind of execution mode between ballast bridge inverter main circuit and the fluorescent tube;
Fig. 3 is the electrical interconnection figure that filament preheating circuit of the present invention is connected the another kind of execution mode between ballast bridge inverter main circuit and the fluorescent tube;
The voltage and current waveform of existing filament of Fig. 4 and lamp tube ends;
Fig. 5 a is after adding electronics switching preheat circuit of the present invention, the filament when fluorescent tube preheating and puncture and the voltage and current waveform of lamp tube ends;
To be Fig. 5 a puncture the waveform amplification figure of (0.65s is instantaneous) when lighting at fluorescent tube to Fig. 5 b.
Embodiment
Filament pre-heating start-up circuit of the present invention, shown in Fig. 2 dotted portion, mainly finish fluorescent tube preheating, be triggered to the process of lighting.As shown in Figure 2, it is connected by Q
1, Q
2, C
1, C
3, C
4, C
5, C
6, T
3, T
1Between the ballast bridge inverter main circuit of being formed and Duo Zhi fluorescent tube, wherein, T
1Be circuit master output transformer, be used for power conversion between fluorescent tube triggering and photoelectricity.
Article one branch road between two nodes (1), (3) is transformer T
2Elementary N
T2
The second branch road is by diode D
1, first resistance R
1, the 2nd R
2C2 forms with capacitor;
Article three, branch road is to be made of controllable silicon SCR.
Two resistance R in described second branch road
1, R
2Between node by diac D
2, series resistance R4 links to each other with the trigger end of bidirectional triode thyristor SCR;
Transformer (the T of described first branch road
2) the secondary filament two ends that are connected fluorescent tube.
The transformer T of first branch road
2Secondary N '
T2-1, N '
T2-2, N '
T2-3Be connected the two ends of the filament of fluorescent tube, be used for the filament of fluorescent tube is started preceding preheating.In first branch road, also can be connected in series damping resistance (R
3), the aura that produces when being used to suppress the fluorescent tube preheating.
After the ballast energising, the entire circuit starting oscillation.Constitute the T of shunt circuit
1, T
2, C
1As the load of circuit, in the loop because T
1With T
2Elementary be mutual series connection, the impedance ratio Z between them
T1/ Z
T2To U
12Carry out dividing potential drop.At this moment fall at T
2Elementary voltage U
13By the suitable turn ratio, level produces voltage secondarily, puts on each tube filament two ends, and tube filament is heated.U
T2Pass through D simultaneously
1, R
1, to capacitor C
2Charge.By SCR, R
1, R
2, R
4, D
1, D
2, C
2The triggering timing circuit of forming.Work as C
2Both end voltage rises to diac D
2Triggering level after, the controllable silicon conducting that is triggered, and form short circuit to (1), (3) node.This moment U
12Voltage all switches to T
1T is passed through at elementary two ends
1Primary and secondary turn ratio relation, secondary voltage have been raised and have been added to filament by the lamp tube ends of abundant preheating, and gas is punctured the shinny work of fluorescent tube at an easy rate in the fluorescent tube by voltage.
Because controllable silicon has the characteristic of keeping conducting after the triggering, T when lamp works
2Elementary always by short circuit, this moment, the filament both end voltage was almost nil, and filament keeps heat by lamp current, is turned off T until ballast power
2Initial condition before the loop will be returned to again and start.
The delay time length of 1 pair of tube filament preheating of this filament pre-heating start-up circuit depends on C
2, R
1, R
2Charge constant, and diac D
2Threshold voltage.
During preheating, the voltage of lamp tube ends can be selected suitable Z according to the characteristic of fluorescent tube
T1/ Z
T2Ratio.According to
Can estimate light tube electric voltage, its amplitude is not so that fluorescent tube produces glow current is as the criterion.R
3Be loop damping resistance, suitable resistance can suppress the generation of glow current.
When warm is finished, the moment of controllable silicon action, T
1Transformer secondary output can produce higher voltage Vsec, thereby lights fluorescent tube.T is depended in the selection of Vsec
1Transformer turn ratio, and decide by fluorescent tube cold-starting characteristic.
The present invention considers that also some fluorescent tubes still need certain heater current to keep the heat of filament when operate as normal, and its circuit (see figure 3), operation principle are when controllable silicon (SCR) is closed, by transformer T
1The elementary portion of energy of telling is fed to transformer T by the controllable silicon branch road
2On, this makes transformer T
2The secondary voltage that obtains is supplied with filament, thereby reaches the effect of keeping heater current.
Filament when Fig. 5 a is fluorescent tube preheating and puncture and the voltage and current waveform of lamp tube ends, wherein, t represents time shaft, every lattice 0.2s.
As can be seen, warm-up time is abundant among the figure, and the time is 0.65s.After lamp was lighted, filament voltage cut off, and had saved the power consumption of filament, had improved the energy consumption grade of ballast effectively.
Fig. 5 b is that fluorescent tube punctures the instantaneous filament and the voltage current waveform of lamp tube ends, and wherein, t represents time shaft, every lattice 1ms.
To be Fig. 5 a puncture the waveform amplification of (0.65s is instantaneous) when lighting at fluorescent tube to Fig. 5 b.As can be seen, puncture instantaneously among the figure, light tube electric voltage moment rises, and makes the fluorescent tube electricity bright, and the simultaneously former voltage that adds on the filament also disappears thereupon.
Claims (3)
1. Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost, it is connected between ballast bridge inverter main circuit and the fluorescent tube, it is characterized in that, and it comprises three parallel branches:
Article one, branch road is filament transformer (T
2) elementary (N
T2);
The second branch road is by diode (D
1) and the first resistance (R
1) after the series connection, the second resistance (R again connects
2) constitute with the parallel branch of capacitor (C2);
Article three, branch road is to be made of bidirectional triode thyristor (SCR),
Wherein, two resistance (R in described second branch road
1, R
2) between contact by diac (D
2) series resistance (R
4) after, link to each other with controllable silicon (SCR) trigger end;
Transformer (the T of described first branch road
2) secondary each winding be connected the filament two ends of fluorescent tube;
It also comprises a transformer (T who is in series with described three parallel branches
1), this transformer (T
1) elementary (N
T1) and filament transformer (T
2) elementary (N
T2) the formation tandem-type connection.
2. a kind of Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost according to claim 1 is characterized in that, also can be connected in series damping resistance (R in described first branch road
3), the glow current when starting to suppress fluorescent tube.
3. a kind of Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost according to claim 1 is characterized in that, described transformer (T
1) elementary winding (N
T1) centre tap connects on described second, third parallel branch, to filament transformer (T
2), the controllable silicon closed circuit provides the energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01125092 CN1266986C (en) | 2000-08-04 | 2001-08-03 | Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00119568.9 | 2000-08-04 | ||
| CN00119568 | 2000-08-04 | ||
| CN 01125092 CN1266986C (en) | 2000-08-04 | 2001-08-03 | Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1400852A CN1400852A (en) | 2003-03-05 |
| CN1266986C true CN1266986C (en) | 2006-07-26 |
Family
ID=4665883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01125092 Expired - Fee Related CN1266986C (en) | 2000-08-04 | 2001-08-03 | Electroncic filament-switching preheating circuit of fluorescence discharge lamp ballost |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1266986C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7199526B2 (en) | 2005-05-06 | 2007-04-03 | Delta Electronics, Inc. | Electronic ballast |
| CN101621886B (en) * | 2008-06-30 | 2013-08-07 | 比亚迪股份有限公司 | Driving circuit and lighting system of high-frequency high-voltage fluorescent lamp |
| CN101778524B (en) * | 2009-09-02 | 2012-12-05 | 海洋王照明科技股份有限公司 | Fluorescent lamp dimming control circuit and dimmable fluorescent lamp thereof |
| CN101652014B (en) * | 2009-09-17 | 2013-06-19 | 来献达 | Electronic ballast |
-
2001
- 2001-08-03 CN CN 01125092 patent/CN1266986C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1400852A (en) | 2003-03-05 |
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| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
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Granted publication date: 20060726 Termination date: 20110803 |