CN2676561Y - Electronic ballast - Google Patents
Electronic ballast Download PDFInfo
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- CN2676561Y CN2676561Y CN 200320119057 CN200320119057U CN2676561Y CN 2676561 Y CN2676561 Y CN 2676561Y CN 200320119057 CN200320119057 CN 200320119057 CN 200320119057 U CN200320119057 U CN 200320119057U CN 2676561 Y CN2676561 Y CN 2676561Y
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- filament
- circuit
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- type half
- frequency conversion
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Abstract
The utility model relates to an electronic ballast, which belongs to an electric lighting field. A high-frequency coupling filament heating circuit is connected to the output end of a frequency conversion type half-bridge oscillating circuit. A transformer primary winding of the high-frequency coupling filament heating circuit is connected in parallel to the output end of the frequency conversion type half-bridge oscillating circuit. A resonant capacitor is connected in parallel to the output end of the frequency conversion type half-bridge oscillating circuit. The utility model has a simple structure, effectively decreases the wastage of a cathode filament, and prolongs the service life of a fluorescent tube. When the burning off of one of filaments at both ends of a fluorescent lamp is generaged, the Fluorescent lamp can go on working and lighting.
Description
Technical field the utility model electric ballast belongs to electric lighting field, particularly relates to a kind of electric ballast of fluorescent lamp.
The electric ballast of the present conventional criteria type of background technology is the alternating current that upper frequency is provided for fluorescent lamp, it provides constant current to Filament of fluorescent lamp, and make the lamp operate as normal, common high-frequency electronic ballast is after energising, because of the component parameters that influences frequency in the circuit fixing, there is not other circuit that filament is heated again, the filament heating current is the numerical value basic fixed when startup and normal ignition, the filament heating current is less than normal when starting, filament is not heated to just emitting electrons by force under high voltage of optimum temperature, cause the sputter of cathode emission material easily, and the filament heating current is bigger than normal when normal ignition, has quickened the loss of cathode filament, has shortened the useful life of fluorescent tube, common electric ballast heater current must pass through resonant capacitance, circuit can't resonance so filament is had no progeny, and one of them filament produces when blowing at the two ends of fluorescent lamp, and fluorescent lamp just can not work on luminous, must change fluorescent tube, make the life-span of fluorescent lamp reduce.
The purpose of this utility model is to avoid weak point of the prior art and a kind of fluorescent lamp technical scheme in useful life that prolongs is provided, one of them filament produces when blowing at the two ends of fluorescent lamp, fluorescent lamp can normally start luminous, keeps the constant electronic ballast for fluoresent lamp of luminous flux.
The content the purpose of this utility model of utility model reaches by following measure; electric ballast is by power factor controller; protective circuit and oscillating circuit are formed; oscillating circuit is to adopt frequency conversion type half-bridge driven IC to drive two metal-oxide-semiconductor symmetrical operations; high frequency lotus root of output connection at the frequency conversion type half-bridge oscillation circuit is closed filament heating circuit; the primary winding that the high frequency lotus root is closed filament heating circuit is connected in parallel on the output of frequency conversion type half-bridge oscillation circuit by electric capacity; output at the frequency conversion type half-bridge oscillation circuit is parallel with resonant capacitance; the high frequency lotus root is closed filament heating circuit and is connected on the fluorescent tube; the frequency conversion type half-bridge oscillation circuit is connected on the fluorescent tube; when work; the frequency conversion type half-bridge oscillation circuit is high-frequency current of output earlier; because of the resonant capacitance capacitive reactance less; be not enough to produce high pressure at the two ends of fluorescent tube and make fluorescent tube glow discharge; because the high frequency lotus root is closed the transformer of filament heating circuit is connected in parallel on the frequency conversion type half-bridge oscillation circuit by electric capacity output; produce sufficient preheat curent at the two ends of fluorescent tube; electric current of frequency conversion type half-bridge oscillation circuit output afterwards than low frequency; resonant capacitance is because of the increase of capacitive reactance; produce the two ends that a high-voltage pulse is added in fluorescent tube at its two ends; make fluorescent tube glow discharge; the fluorescent tube conducting; fluorescent tube descends because of negative resistance charactertistic makes modulating voltage; lamp current increases; enter steady-working state over time; the primary winding voltage that the high frequency lotus root that is connected in parallel on frequency conversion type half-bridge oscillation circuit output is closed filament heating circuit descends with modulating voltage; when the cathode filament of fluorescent tube one end has broken; the cathode filament of the other end can close the normal preheating of filament heating circuit by the high frequency lotus root; be added in the two ends of fluorescent tube at the resonant capacitance high pressure that resonance produces in circuit of frequency conversion type half-bridge oscillation circuit output parallel connection; can make fluorescent tube glow discharge; the luminous flux of fluorescent tube is constant substantially; the frequency conversion type half-bridge oscillation circuit can produce a high-frequency current earlier when fluorescent tube starts; close filament heating circuit by the high frequency lotus root filament is carried out preheating; just produce high pressure then in lamp tube ends; like this can be so that tube filament can both obtain suitable current when startup and normal ignition; simultaneously heater current have one independently the high frequency lotus root close filament heating circuit; need not pass through resonant capacitance; when one of them filament blow of the two ends of fluorescent lamp; resonant capacitance still can produce high pressure, makes the life-span of fluorescent lamp prolong.
Output loop of the present utility model a plurality of fluorescent tubes of can connecting.
High frequency lotus root of the present utility model is closed filament heating circuit and heats for a plurality of fluorescent tube cathode filaments of series connection respectively.，
Power factor controller of the present utility model is to adopt prior art, can adopt different various power factor controller circuit.
Protective circuit of the present utility model is to adopt prior art, can adopt different various protective circuits.
The utility model is simple in structure, has effectively reduced the loss of cathode filament, prolongs the useful life of fluorescent tube, and one of them filament produces when blowing at the two ends of fluorescent lamp, and fluorescent lamp can work on luminous.
Description of drawings
Accompanying drawing 1 is an electrical block diagram of the present utility model.
Accompanying drawing 2 is circuit of electronic ballast schematic diagrames of the present utility model.
Accompanying drawing 3 is embodiment circuit diagrams of the present utility model.
Accompanying drawing 4 is embodiment circuit diagrams of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1; the utility model electric ballast is by power factor controller; protective circuit; the high frequency lotus root closes filament heating circuit and the frequency conversion type half-bridge oscillation circuit is formed; output connection high frequency lotus root at the frequency conversion type half-bridge oscillation circuit is closed filament heating circuit; the high frequency lotus root is closed filament heating circuit and is connected on the fluorescent tube, and the frequency conversion type half-bridge oscillation circuit is connected on the fluorescent tube.The frequency conversion type half-bridge oscillation circuit can produce a high-frequency current earlier when fluorescent tube starts, close filament heating circuit by the high frequency lotus root filament is carried out preheating, just produce high pressure then in lamp tube ends, heater current have one independently the high frequency lotus root close filament heating circuit, need not pass through resonant capacitance, when one of them filament blow of the two ends of fluorescent lamp, resonant capacitance still can produce high pressure, makes the life-span of fluorescent lamp prolong.
As shown in Figure 2; the utility model electric ballast is by power factor controller; protective circuit; the high frequency lotus root closes filament heating circuit and the frequency conversion type half-bridge oscillation circuit is formed; the frequency conversion type oscillating circuit is to adopt frequency conversion type half-bridge driven IC to drive two metal-oxide-semiconductor symmetrical operations; the power factor controller circuit is to adopt prior art; protective circuit is to adopt prior art; high frequency lotus root of output connection at the frequency conversion type half-bridge oscillation circuit is closed filament heating circuit; the high frequency lotus root is closed filament heating circuit and is made up of transformer L5 and capacitor C 19; the primary winding that the high frequency lotus root is closed filament heating circuit is connected in parallel on the output of frequency conversion type half-bridge oscillation circuit by electric capacity; output at the frequency conversion type half-bridge oscillation circuit is parallel with resonant capacitance C18; the high frequency lotus root is closed filament heating circuit and is connected on the fluorescent tube LAMP, and the frequency conversion type half-bridge oscillation circuit is connected on the fluorescent tube.Filament one end of fluorescent tube is connected the output of frequency conversion type half-bridge oscillation circuit, the filament other end is connected the high frequency lotus root and closes on the Transformer Winding of filament heating circuit, filament one end of the other end of fluorescent tube is connected the output of frequency conversion type half-bridge oscillation circuit, and the filament other end is connected the high frequency lotus root and closes on the Transformer Winding of filament heating circuit.
As shown in Figure 3, high frequency lotus root of output connection at the frequency conversion type half-bridge oscillation circuit is closed filament heating circuit, the elementary winding of transformer L5 that the high frequency lotus root is closed filament heating circuit is connected in parallel on the output of frequency conversion type half-bridge oscillation circuit by capacitor C 19, output at the frequency conversion type half-bridge oscillation circuit is parallel with resonant capacitance C18, the high frequency transformer L5 that the high frequency lotus root is closed filament heating circuit connects resonant capacitance, the output of frequency conversion type half-bridge oscillation circuit connects an end of fluorescent tube LAMP filament, one end of filament is connected on the high frequency transformer L5, at high-frequency current of frequency conversion type half-bridge oscillation circuit output, the resonant capacitance capacitive reactance is less, be not enough to produce high pressure at the two ends of fluorescent tube and make fluorescent tube glow discharge, because the high frequency lotus root is closed the transformer L5 of filament heating circuit is connected in parallel on the frequency conversion type half-bridge oscillation circuit by capacitor C 19 output, produce sufficient preheat curent at the two ends of fluorescent tube, electric current of frequency conversion type half-bridge oscillation circuit output than low frequency, resonant capacitance is because of the variation of capacitive reactance, the pulse that produces a high pressure at its two ends is added in the two ends of fluorescent tube, make fluorescent tube glow discharge, the fluorescent tube conducting.The tube filament electric current have one independently the high frequency lotus root close filament heating circuit, need not pass through resonant capacitance, when one of them filament blow of the two ends of fluorescent lamp, the cathode filament of the other end can close the normal preheating of filament heating circuit by the high frequency lotus root, the high pressure that produces at the resonance of resonant capacitance in circuit of the output parallel connection of frequency conversion type half-bridge oscillation circuit is added in the two ends of fluorescent tube, resonant capacitance still can produce high pressure, makes the life-span of fluorescent lamp prolong.
As shown in Figure 4, high frequency lotus root of the present utility model is closed filament heating circuit a plurality of fluorescent tube LAMP that can connect, the high frequency lotus root is closed filament heating circuit and heats for a plurality of fluorescent tube cathode filaments of series connection respectively, when one of them filament blow of the two ends of a fluorescent lamp, the cathode filament of the other end can close the normal preheating of filament heating circuit by the high frequency lotus root, the high pressure that produces at the resonance of resonant capacitance in circuit of the output parallel connection of frequency conversion type half-bridge oscillation circuit exists in the two ends of fluorescent tube, and resonant capacitance still can produce high pressure.
Claims (4)
1, a kind of electric ballast; by power factor controller; protective circuit and oscillating circuit are formed; oscillating circuit is to adopt the frequency conversion type half-bridge oscillation circuit; it is characterized in that closing filament heating circuit the output connection high frequency lotus root of frequency conversion type half-bridge oscillation circuit; the high frequency lotus root is closed filament heating circuit and is connected on the fluorescent tube, and the frequency conversion type half-bridge oscillation circuit is connected on the fluorescent tube.
2, electric ballast according to claim 1, it is characterized in that the high frequency lotus root closes the primary winding of filament heating circuit is connected in parallel on the frequency conversion type half-bridge oscillation circuit by electric capacity output, output at the frequency conversion type half-bridge oscillation circuit is parallel with resonant capacitance, the high frequency transformer that the high frequency lotus root is closed filament heating circuit connects resonant capacitance, the output of frequency conversion type half-bridge oscillation circuit connects an end of filament, and an end of filament is connected on the high frequency transformer.
3, electric ballast according to claim 2, it is characterized in that filament one end of fluorescent tube is connected the output of frequency conversion type half-bridge oscillation circuit, the filament other end is connected the high frequency lotus root and closes on the Transformer Winding of filament heating circuit, filament one end of the other end of fluorescent tube is connected the output of frequency conversion type half-bridge oscillation circuit, and the filament other end is connected the high frequency lotus root and closes on the Transformer Winding of filament heating circuit.
4, electric ballast according to claim 2 is characterized in that output loop a plurality of fluorescent tubes of connecting, and the high frequency lotus root is closed the cathode filament heating that filament heating circuit is given a plurality of fluorescent tubes respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320119057 CN2676561Y (en) | 2003-12-08 | 2003-12-08 | Electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320119057 CN2676561Y (en) | 2003-12-08 | 2003-12-08 | Electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2676561Y true CN2676561Y (en) | 2005-02-02 |
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ID=34475596
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320119057 Expired - Fee Related CN2676561Y (en) | 2003-12-08 | 2003-12-08 | Electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2676561Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108987222A (en) * | 2018-09-05 | 2018-12-11 | 杭州惠威无损探伤设备有限公司 | A kind of circuit structure of LC resonance X-ray tube filament heating |
| CN109348604A (en) * | 2018-11-23 | 2019-02-15 | 肇庆三雄极光照明有限公司 | A kind of Metal halogen lamp ballast of constant-power control circuit |
-
2003
- 2003-12-08 CN CN 200320119057 patent/CN2676561Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108987222A (en) * | 2018-09-05 | 2018-12-11 | 杭州惠威无损探伤设备有限公司 | A kind of circuit structure of LC resonance X-ray tube filament heating |
| CN108987222B (en) * | 2018-09-05 | 2023-10-27 | 杭州惠威无损探伤设备有限公司 | Circuit structure for heating LC resonance X-ray tube lamp wire |
| CN109348604A (en) * | 2018-11-23 | 2019-02-15 | 肇庆三雄极光照明有限公司 | A kind of Metal halogen lamp ballast of constant-power control circuit |
| CN109348604B (en) * | 2018-11-23 | 2023-09-19 | 肇庆三雄极光照明有限公司 | Metal halide lamp ballast of constant power control circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050202 Termination date: 20111208 |