CN2615999Y - Electronic ballast of fluorescent lamp - Google Patents
Electronic ballast of fluorescent lamp Download PDFInfo
- Publication number
- CN2615999Y CN2615999Y CN 03224101 CN03224101U CN2615999Y CN 2615999 Y CN2615999 Y CN 2615999Y CN 03224101 CN03224101 CN 03224101 CN 03224101 U CN03224101 U CN 03224101U CN 2615999 Y CN2615999 Y CN 2615999Y
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- circuit
- filament
- direct current
- electronic ballast
- voltage
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Abstract
A fluorescent lamp electronic ballast is equipped with a direct-current-supply inputting end which is connected with an exchange high-voltage shaping circuit connecting with two ends of a light tube, and is characterized in that the direct current-supply inputting end is also connected with a filament direct-current preheating circuit which is controlled by a time-lag turn-off controlling circuit, the filaments of the light tube are connected with the outputting end of the filament direct-current preheating circuit. The utility model can add the exchange high-voltage to two ends of the light tube and at the same time provide every group of the filaments with the direct current which is made to preheat and heat up, and reduces the puncture of the light tubes and the lighting of the voltage, and prolongs the service life of the light tubes.
Description
Technical field
The utility model belongs to a kind of electronic ballast for fluoresent lamp of DC power supply.
Background technology
The function of the electronic ballast for fluoresent lamp of DC power supply is low-voltage DC to be become ac high-voltage offer fluorescent tube, the deficiency that existing this class ballast exists is: work as energized, when ac high-voltage has just acted on lamp tube ends, because the two ends filament cathode does not also obtain abundant preheating, negative electrode does not reach the temperature of normal transmission electronics, lamp tube ends just needs higher puncture keep-alive voltage, so occur the circuit block sparking easily, punch-through, and filament cathode is at a lower temperature during emitting electrons, electronics powder on the cathode material can be splashed on the tube wall, cause the lamp tube ends blackout, and shortened lamp tube service life.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of when providing ac high-voltage for lamp tube ends, can carry out the electronic ballast for fluoresent lamp of preheating for filament provides direct current simultaneously.
The technical scheme that addresses the above problem is: the utility model is provided with dc supply input, dc supply input connects ac high-voltage and forms circuit, ac high-voltage forms circuit output end and connects the fluorescent lamp tube two ends, it is characterized in that: dc supply input also is connected to the filament direct current preheat circuit by the control of time delayed turn-off control circuit, two groups of filaments of fluorescent lamp connect the dc output end of filament direct current preheat circuit, and filament direct current preheat circuit output and ac high-voltage form between the circuit output end and be provided with the alternating current-direct current buffer circuit.
The course of work of this device is: connect in DC power supply, when ac high-voltage formation circuit provides ac high-voltage for lamp tube ends, filament direct current preheat circuit is also connected, direct current flows through the filament of lamp tube ends, ac high-voltage by clamper in low-voltage, after filament temperature raises, time delayed turn-off circuit cuts off filament direct current preheat circuit, lamp tube ends is punctured normal ignition by ac high-voltage, the alternating current-direct current buffer circuit plays isolates the galvanic effect that is added in the alternating current of lamp tube ends and is added in every group of filament two ends respectively, prevents that filament direct current preheat circuit will be added in the ac high-voltage short circuit of lamp tube ends.
The utility model can be when adding ac high-voltage for the fluorescent lamp two ends, for providing direct current, heat on every group of filament, it is rapidly heated, fully preheating, reduce the puncture keep-alive voltage of fluorescent tube, prevent that sparking, punch-through from appearring in circuit element, can avoid the filament cathode lamp tube ends that emitting electrons caused under the low-temperature condition phenomenon of turning black too early simultaneously, the useful life of prolonging lamp tube.
Description of drawings
Fig. 1, the utility model frame principle figure
Fig. 2, the utility model embodiment circuit diagram
Specific embodiments
This routine power supply is 12 volts of direct currents, filament direct current preheat circuit and the time delayed turn-off control circuit structure of controlling this circuit are: be connected to time-delay charging capacitor C2 between switch triode Q3 input base stage and ground, be in series with relay J in the collector electrode output circuit, the normally-closed contact J1 of relay setting is connected in the filament direct current preheat circuit, two groups of filaments of fluorescent tube are connected in parallel at filament direct current preheat circuit output, described alternating current-direct current buffer circuit is connected between two groups of filaments, its structure is between an end of one group of filament and another group filament one end, be in series with two opposite polarity isolating diode D3, D4, between other two ends filament, also be in series with two opposite polarity isolating diode D5, D6, one group of D3 of isolating diode of two groups of series connection, D4 is anodal and anodal the connection, another organizes D5, D6 is that negative pole is connected with negative pole, and anodal with the anodal tie point and the tie point of negative pole and negative pole connect filament direct current preheat circuit two outputs respectively.
When 12 volts of DC power supply are connected, between the charge period of delay capacitor C2, switching tube Q3 closes, relay J is failure to actuate, its normally-closed contact J1 is in closure state, filament direct current preheat circuit conducting this moment, the direct current of its output is from two isolating diode D3, the positive pole of D4 and anodal tie point flow into, and flow through two filaments through these two diodes respectively, more respectively through two isolating diode D5, D6, flow out from the negative pole and the negative pole tie point of this two diode, in this stage, two groups of filaments that flow through direct current clamp down on the ac high-voltage of lamp tube ends in electronegative potential, when delay capacitor C2 charging finishes, switching tube Q3 conducting, the relay J action, its normally-closed contact J1 disconnects, and cuts off filament direct current preheat circuit, two filaments do not have direct current and flow through, and fluorescent tube is punctured normal ignition by ac high-voltage.Four isolating diodes can only allow direct current flow through two groups of filaments, then play buffer action to being added in two groups of ac high-voltages between the filament, will be added in two groups of ac high-voltage short circuits between the filament to prevent filament direct current preheat circuit.
This routine ac high-voltage forms circuit and is made up of high-frequency oscillating circuits and step-up transformer L2, by two triode Q1 in parallel, Q2 and peripheral components R3, R4, R5, R6, C3, the elementary winding L 2-1 of step-up transformer L2, L2-2, L2-3 forms oscillating circuit and forms the parallel pushpull output circuit with the secondary winding L2-4 of step-up transformer L2, secondary winding L2-4 two ends connect lamp tube ends respectively, this circuit output end L2-4 produces is symmetrically sine voltage, can guarantee that two groups of filament cathodes of fluorescent tube evenly launch, it is inhomogeneous and cause the fluorescent tube one end phenomenon of blackout too early to have overcome single tube output asymmetrical alternating current voltage causes in the existing ballast filament cathode emission.
Be in series with and electric power polarity identical polarities protection rectifier diode D1 at 12 volts of dc supply inputs; its function one is with C1 the rectifying and wave-filtering effect to be arranged; the more important thing is when the generation electric power polarity connects anti-misoperation to have the function that circuit element is shielded.
Claims (7)
1, a kind of electronic ballast for fluoresent lamp, be provided with dc supply input, dc supply input connects ac high-voltage and forms circuit, ac high-voltage forms circuit output end and connects the fluorescent lamp tube two ends, it is characterized in that: dc supply input also is connected to the filament direct current preheat circuit by the control of time delayed turn-off control circuit, two groups of filaments of fluorescent lamp connect the dc output end of filament direct current preheat circuit, and filament direct current preheat circuit output and ac high-voltage form between the circuit output end and be provided with the alternating current-direct current buffer circuit.
2, electronic ballast for fluoresent lamp according to claim 1, it is characterized in that: described filament direct current preheat circuit and the time delayed turn-off control circuit structure of controlling this circuit are: be connected to time-delay charging capacitor (C2) between switch triode (Q3) input base stage and ground, be in series with relay (J) in the collector electrode output circuit, the normally-closed contact (J1) that relay is provided with is connected in the filament direct current preheat circuit, and two groups of filaments of fluorescent tube are connected in parallel at filament direct current preheat circuit output.
3, electronic ballast for fluoresent lamp according to claim 1 and 2, it is characterized in that: described alternating current-direct current buffer circuit is connected between two groups of filaments, its structure is between an end of one group of filament and another group filament one end, be in series with two opposite polarity isolating diodes (D3), (D4), between other two ends filament, also be in series with two opposite polarity isolating diodes (D5), (D6), one group of the isolating diode (D3) of two groups of series connection, (D4) be anodal and anodal the connection, another group (D5), (D6) be that negative pole is connected with negative pole, anodal with the anodal tie point and the tie point of negative pole and negative pole connect filament direct current preheat circuit two outputs respectively.
4, electronic ballast for fluoresent lamp according to claim 1 and 2, it is characterized in that: described ac high-voltage formation circuit is formed oscillating circuit and is formed the parallel pushpull output circuit with the secondary winding (L2-4) of step-up transformer (L2) by elementary winding (L2-1), (L2-2), (L2-3) of two triodes in parallel (Q1), (Q2) and peripheral components and step-up transformer (L2), and the secondary winding that boosts (L2-4) two ends connect lamp tube ends respectively.
5, electronic ballast for fluoresent lamp according to claim 3, it is characterized in that: described ac high-voltage formation circuit is formed oscillating circuit and is formed the parallel pushpull output circuit with the secondary winding (L2-4) of step-up transformer (L2) by elementary winding (L2-1), (L2-2), (L2-3) of two triodes in parallel (Q1), (Q2) and peripheral components and step-up transformer (L2), and the secondary winding that boosts (L2-4) two ends connect lamp tube ends respectively.
6, electronic ballast for fluoresent lamp according to claim 1 and 2 is characterized in that: be in series with and electric power polarity identical polarities protection rectifier diode (D1) at dc supply input.
7, electronic ballast for fluoresent lamp according to claim 3 is characterized in that: be in series with and electric power polarity identical polarities protection rectifier diode (D1) at dc supply input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03224101 CN2615999Y (en) | 2003-03-11 | 2003-03-11 | Electronic ballast of fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03224101 CN2615999Y (en) | 2003-03-11 | 2003-03-11 | Electronic ballast of fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2615999Y true CN2615999Y (en) | 2004-05-12 |
Family
ID=34245544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03224101 Expired - Fee Related CN2615999Y (en) | 2003-03-11 | 2003-03-11 | Electronic ballast of fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2615999Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355784A (en) * | 2011-08-31 | 2012-02-15 | 桂林灵川县安华电器厂 | DC-AC electronic ballast |
-
2003
- 2003-03-11 CN CN 03224101 patent/CN2615999Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355784A (en) * | 2011-08-31 | 2012-02-15 | 桂林灵川县安华电器厂 | DC-AC electronic ballast |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGDONG XUELAITE PHOTOELECTRIC TECHNOLOGY CO., Free format text: FORMER OWNER: CHAI GUOSHENG Effective date: 20050624 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20050624 Address after: 528225, Foshan City, Guangdong Province Nanhai District Shishan science and Technology Industrial Park A District Guangdong snow Wright photoelectric Polytron Technologies Inc Patentee after: Bright Star Light & Electricity Industry Co., Ltd. Address before: 528225 Nanhai District, Shishan, Guangdong science and Technology Industrial Park A District Nanhai City Huaxing photoelectric industry Co., Ltd. Patentee before: Chai Guosheng |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20040512 |