CN2445542Y - Direct-current power supply for fluorescent lamp - Google Patents
Direct-current power supply for fluorescent lamp Download PDFInfo
- Publication number
- CN2445542Y CN2445542Y CN 00221966 CN00221966U CN2445542Y CN 2445542 Y CN2445542 Y CN 2445542Y CN 00221966 CN00221966 CN 00221966 CN 00221966 U CN00221966 U CN 00221966U CN 2445542 Y CN2445542 Y CN 2445542Y
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- CN
- China
- Prior art keywords
- fluorescent lamp
- power supply
- filament
- direct
- voltage
- 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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Abstract
The utility model discloses a direct-current power supply for fluorescent lamps, which uses the mode of filament preheating, high-voltage ignition and start and stable direct-current supply. The utility model has the advantages that the service life of the fluorescent lamps is prolonged; the brightness of lamplight is stable; the direct-current power supply has no stroboscopic effect on people's eyes, and also has no electromagnetic interference caused by high frequency oscillation. If a fluorescent lamp is combined with the utility model, the fluctuation of the luminous light intensity can be less than 4 percents.
Description
The utility model relates to a kind of DC power supply of fluorescent lamp.
People's illuminating lamp used in everyday has incandescent lamp, fluorescent lamp and is all directly supplied with by 50 all alternating currents.Because applied voltage is with the per second variation in 50 weeks, the variation of light and shade also appears in its lamplight brightness thereupon, so people's long-time study and work under this light, it is tired that eyes will be felt, can damage human eye in the course of time.There is a kind of novel power-saving fluorescent lamp to ask the city in recent years again, it produces a high-frequency oscillation signal with 50 all alternating currents through over commutation, filtering, inversion and sends into fluorescent lamp, though it is stable that its lamplight brightness has, but this supply power mode produces certain electromagnetic interference owing to exist the higher-order of oscillation to environment.
The purpose of this utility model provides a kind of lamplight brightness stable, and does not have the DC power supply of the fluorescent lamp of electromagnetic interference.
For achieving the above object, the DC power supply of fluorescent lamp of the present utility model is made up of the filament preheating circuit of fluorescent lamp, the little electric current high-tension circuit that triggers startup usefulness and the low-voltage direct current stabilization circuit of steady operation.After connecting 50 all AC power, foregoing circuit almost is added on the fluorescent lamp simultaneously, and when the pre-thermal electron of tube filament, and then little electric current high-tension circuit just triggers fluorescent tube, fluorescent tube is ignited, supply with the normal stable operating voltage of fluorescent lamp immediately by the low-voltage, high-current dc steady flow circuit.
Described Filament of fluorescent lamp preheat circuit directly is added to filament one end after by bridge rectifier and step-down, it has overcome filament when non-pipeline start up by preheating, because filament material does not also reach the thermionic emission state, just add high voltage in lamp tube ends, cause the serious sputter of filament emitting material, early stage blackspot occurs around making the lamp tube ends filament, cause the fluorescent tube shortening in useful life.
Described little electric current high-tension circuit is by the little current DC high pressure of four voltage doubling rectifing circuits generation greater than 1000 volts, be used for triggering the fluorescent lamp tube that ignites, after in a single day fluorescent tube is triggered and ignites, change the low-voltage direct current stabilization circuit of described steady operation immediately over to, make fluorescent lamp enter steady operation.
The DC power supply of fluorescent lamp of the present utility model adopts filament pre-heating, high pressure ignites and the mode of stable DC power voltage supply, and its lamplight brightness is stable, and people's eyes are not had stroboscopic effect, the electromagnetic interference that does not yet have the higher-order of oscillation to cause.
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the circuit diagram of the DC power supply of the utility model fluorescent lamp.
As shown in Figure 1, the circuit of the DC power supply of fluorescent lamp by 50 all alternating currents behind K switch and fuse FU, be divided into two branch roads: pass through the dc steady flow circuit that triode VT etc. forms after bridge rectifier that branch road is made up of diode D1-D4 after through the R1C1 step-down and big capacitor C 2 filtering again, emitter output by triode VT connects with Filament of fluorescent lamp 4 mutually through diode D6, D7, provides direct-flow steady voltage to fluorescent tube.Another branch road arrives four voltage doubling rectifing circuits of being made up of diode D8-D11 and capacitor C 4-C7 through resistance R T1, produce one greater than 1000 volts high direct voltage, its output connects with filament 3 with diode D12 mutually through resistance R 7, ignites in order to fluorescent tube is triggered.Because this circuit can only play the effect of igniting to fluorescent tube, with the 13W fluorescent lamp is example, its output current only has about 5 milliamperes, the about 150 milliamperes steady operation electric current of needs in the time of can not satisfying this fluorescent lamp operate as normal, at this moment, export about 150 milliamperes of electric currents and and then about 100 volts voltage deliver to filament 4 by the high-current low-voltage dc steady flow circuit, keep fluorescent lamp and enter steady operation.
Diode D6, D7 and D12 are used for isolating power supply between dc steady flow circuit and four voltage doubling rectifing circuits, and can reduce the requirement of withstand voltage to triode VT.
In addition, output connects mutually with Filament of fluorescent lamp 1 with neon bulb RT2 through resistance R 3 by the output of bridge rectifier, and filament is carried out preheating.Filament 2 connects mutually with ground.
Fluorescent lamp uses together with the utility model, and its luminous light-intensity variation can be less than 4%.
Claims (3)
1, a kind of DC power supply that is used for fluorescent lamp is made up of Filament of fluorescent lamp preheat circuit, four voltage doubling rectifing circuits and dc steady flow circuit, it is characterized in that: Filament of fluorescent lamp 1,3 and 4 is delivered in the output of foregoing circuit respectively.
2, the DC power supply of fluorescent lamp according to claim 1 is characterized in that: the high voltage of described four voltage doubling rectifing circuits output is added to filament 3, and the low-voltage of being exported by dc steady flow circuit is added to filament 4 immediately.
3, the DC power supply of fluorescent lamp according to claim 1 is characterized in that: by preheat circuit filament 1 is carried out preheating earlier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00221966 CN2445542Y (en) | 2000-09-28 | 2000-09-28 | Direct-current power supply for fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00221966 CN2445542Y (en) | 2000-09-28 | 2000-09-28 | Direct-current power supply for fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2445542Y true CN2445542Y (en) | 2001-08-29 |
Family
ID=33586778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00221966 Expired - Fee Related CN2445542Y (en) | 2000-09-28 | 2000-09-28 | Direct-current power supply for fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2445542Y (en) |
-
2000
- 2000-09-28 CN CN 00221966 patent/CN2445542Y/en not_active Expired - Fee Related
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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 |