CN1045241C - Output light stabilizer for fluorescent lamp - Google Patents
Output light stabilizer for fluorescent lamp Download PDFInfo
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- CN1045241C CN1045241C CN96103302A CN96103302A CN1045241C CN 1045241 C CN1045241 C CN 1045241C CN 96103302 A CN96103302 A CN 96103302A CN 96103302 A CN96103302 A CN 96103302A CN 1045241 C CN1045241 C CN 1045241C
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- 239000004611 light stabiliser Substances 0.000 title 1
- 239000003381 stabilizer Substances 0.000 claims abstract description 15
- 239000003990 capacitor Substances 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 6
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
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Abstract
The present invention relates to a light output stabilizer for a daylight lamp, which comprises a strip lamp, an electronic stabilizer and a DC voltage bias compensation circuit, wherein the DC voltage bias compensation circuit is respectively connected with the strip lamp and the electronic stabilizer, and a DC power source generated by the DC voltage bias compensation circuit and a high-frequency high-voltage AC power source generated by the electronic stabilizer are mixed and inputted to the strip lamp to sustain stable lamplight output; when the light output power of the strip lamp is reduced to one half or more than one half, the DC power source in the mixed power source provides a DC voltage bias compensation effect. Thus, the present invention can improve the light output stability of the daylight lamp, eliminate the serpentine phenomenon of the daylight lamp and provide the high-quality light output stabilizer for the light lamp.
Description
The present invention relates to a light output stabilizer for a fluorescent lamp, and more particularly, to a light output stabilizer for a fluorescent lamp, which can overcome the serpentine phenomenon of a fluorescent lamp and can be used for a dimming electronic ballast.
At present, fluorescent lamps are generally used in lighting lamps in various spaces in the market; in order to adjust the brightness of a conventional fluorescent lamp, a dimming electronic ballast is usually provided, and the brightness of the lamp light is adjusted by the dimming electronic ballast. In the conventional fluorescent lamp, if the brightness of the fluorescent tube is reduced to half or less, the light of the fluorescent tube is often unstable, and a circle of serpentine appears, so that the dimming effect is poor, and the phenomenon of uncertain light flicker is harmful to eyes of people; therefore, how to improve the unstable light output of the fluorescent lamp is a problem that needs to be solved.
The invention aims to overcome the defects of the prior art and provide a daylight lamp light output stabilizing device which can eliminate the serpentine phenomenon of a daylight lamp and improve the unstable light output phenomenon of the daylight lamp for a user.
The technical scheme for realizing the aim of the invention is that the sunlight lamp light output stabilizing device comprises the following components:
a lamp tube; an electronic stabilizer for providing constant high-frequency voltage to the lamp tube; and
a DC bias compensation circuit connected to the lamp tube and the electronic stabilizer respectively;
by the device, a power supply mixed by a direct current power supply generated by the direct current bias compensation circuit and a high-frequency high-voltage alternating current power supply generated by the electronic stabilizer is jointly input into the lamp tube to maintain stable lamp light output; when the light output power of the lamp tube is reduced to half or less, the DC power supply in the hybrid power supply provides the effect of DC bias compensation.
The electronic ballast of the invention comprises an alternating current-to-direct current conversion circuit, a power factor correction circuit, a resonance conversion circuit, a lamp tube starting circuit and a dimming circuit. The AC-DC converting circuit is a filter rectifying circuit, and an anti-electromagnetic interference filter circuit can be added to the AC-DC converting circuit to filter out the noise of the power supply if necessary. The alternating current input is rectified into a direct current power supply by an alternating current conversion direct current circuit, and after the power quality is improved by a power factor correction circuit, the direct current power supply is converted into a high-frequency alternating current power supply by a resonance conversion circuit, and then the high-frequency alternating current power supply respectively enters a lamp tube starting circuit and a direct current bias compensation circuit; one path of high-frequency alternating current power supply is changed into a high-voltage high-frequency alternating current power supply through a lamp tube starting circuit, the other path of high-frequency alternating current power supply is changed into a direct current power supply through a direct current bias compensation circuit, and then the two paths of power supplies are mixed to drive a lamp tube; meanwhile, the brightness of the lamp tube can be adjusted through the dimming circuit.
The DC bias compensation circuit of the invention has three modes of fixed DC bias, exchange type DC bias and selective type DC bias according to different electronic parts and action modes; the operation principle is that the output end of the electronic stabilizer and the two ends of the lamp tube are connected with the positive pole and the negative pole of the direct current bias in parallel, so that a high-frequency high-voltage alternating current power supply and a low-voltage direct current power supply are arranged on the lamp tube, and the alternating current power supply and the direct current power supply are jointly input into the lamp tube to maintain stable light output; when the light output power of the lamp tube is reduced to half or less, the DC power supply in the hybrid power supply provides the effect of DC bias compensation. The DC bias compensation circuit can improve the unstable light output of the lamp tube, eliminate the serpentine light output of the lamp tube and improve the luminous efficiency of the lamp tube.
Therefore, the invention not only improves the defect of unstable light output of the traditional daylight lamp, but also increases the dimming stable range and obviously improves the light output of the daylight lamp.
The present invention will be described in detail below with reference to the accompanying drawings and examples. Wherein,
fig. 1 is a block diagram of the present invention.
FIG. 2A is a diagram of a fixed DC bias circuit (single lamp) according to the present invention.
FIG. 2B is a diagram of a fixed DC bias circuit (dual lamp) according to the present invention.
FIG. 3A is a schematic diagram of the switching DC bias circuit (single lamp) according to the present invention.
FIG. 3B is a diagram of an alternative DC bias circuit (dual lamp) according to the present invention.
FIG. 4A is a diagram of a selective DC bias circuit (single lamp) according to the present invention.
FIG. 4B is a diagram of a selective DC bias circuit (dual lamp) according to the present invention.
The symbols in the figure are: 10 is an AC-DC converting circuit 41, a fixed DC bias circuit 11, an anti-EMI filter circuit 411, a diode 12, a filter rectifier circuit 412, an electrolytic capacitor 20, an electronic ballast 42, an AC-DC bias circuit 21, a power factor correction circuit 421, a diode 22, a resonant converter circuit 422, an electrolytic capacitor 23, a lamp starting circuit 43, a selective DC bias circuit 24, a dimming circuit 431, a diode 30, a lamp 432, an electrolytic capacitor 40, a DC bias compensation circuit 433, a transistor
Fig. 1 is a block diagram of a lamp light output stabilizing apparatus according to the present invention, including: a lamp 30, an electronic ballast 20, and a DC bias compensation circuit 40.
The lamp tube 30;
the electronic ballast 20 provides a constant high frequency voltage to the lamp 30; and
the dc bias compensation circuit 40 is connected to the lamp 30 and the electronic ballast 20 respectively;
by the above device, the power mixed by the DC power generated by the DC bias compensation circuit 40 and the high-frequency high-voltage AC power generated by the electronic stabilizer 20 are input into the lamp tube 30 together to maintain stable lamp light output; the dc power supply of the hybrid power supply provides a dc bias compensation effect when the light output power of the lamp 30 is adjusted to half or less.
The electronic ballast 20 in fig. 1 includes: an AC-DC converter circuit 10, a power factor correction circuit 21, a resonant converter circuit 22, a lamp starting circuit 23, and a light adjusting circuit 24. While the ac-dc converter circuit 10 shown in fig. 1 is a filter rectifier circuit 12, the ac-dc converter circuit 10 may further include an anti-electromagnetic interference filter circuit 11 to filter out the noise of the power supply.
As shown in fig. 1, after the ac input is rectified into a dc power by the ac converting dc circuit 10, the power quality is improved by the power factor correcting circuit 21, the dc power is converted into a high-frequency ac power by the resonance converting circuit 22, and then the high-frequency ac power enters the lamp tube starting circuit 23 and the dc bias compensating circuit 40, wherein one high-frequency ac power is changed into a high-voltage high-frequency ac power by the lamp tube starting circuit 23, and the other high-frequency ac power is changed into a dc power by the dc bias compensating circuit 40, and then the two power sources are mixed to drive the lamp tube 30; the brightness of the lamp 30 can be adjusted by the dimming circuit 24.
The light output stabilizing device of the present invention is to connect a DC bias compensation circuit 40 in parallel at the output end of the electronic stabilizer 20 and any one of the two ends of the lamp tube 30, and the DC bias compensation circuit 40 is used to improve the unstable light output phenomenon of the lamp tube, eliminate the serpentine phenomenon of the light output of the lamp tube and improve the luminous efficiency of the lamp tube.
As shown in FIGS. 2A, B-4A, B, the DC bias compensation circuit 40 can be divided into different types according to the electronic components and operation methods
(1) A fixed DC bias circuit 41,
(2) A switching DC bias circuit 42 and (3) a selecting DC bias circuit 43.
The electronic components and operation method used in the method are described in detail as follows:
(1) fixed dc bias circuit 41:
as shown in fig. 2A, B, a is a single lamp 30, B is a double lamp 30, the sine wave coupling the primary side of the ballast 20 to the secondary side is full-wave rectified and filtered into a direct current by two diodes 411 and an electrolytic capacitor 412, and then the lamp 30 is biased with a fixed-end direct current.
(2) Switching dc bias circuit 42:
as shown in fig. 3A, B, a is a single lamp 30, B is a double lamp 30, two diodes 421 and two electrolytic capacitors 422 are used to perform dc bias on the lamp 30, when the primary of the ballast 20 is coupled to the secondary sine wave, and in the positive half cycle, a set of diodes 421 and electrolytic capacitors 422 are used to perform rectification and filtering, and then one end of the lamp 30 is subjected to dc bias; when the sine wave is in the negative half cycle, another group of diodes 421 and electrolytic capacitors 422 are used for rectification and filtering, and then the other end of the lamp tube 30 is subjected to direct current bias; therefore, the two ends of the lamp tube 30 can be switched to DC bias voltage, and the DC bias voltage is not fixed at one end of the lamp tube 30, so that the lamp tube 30 at the end is relatively dry and damaged.
(3) Selective dc bias circuit 43:
as shown in fig. 4A, B, a is a single lamp 30, B is a double lamp 30, the sine wave coupling the primary side of the ballast 20 to the secondary side is rectified and filtered by a diode 431 and an electrolytic capacitor 432, and then switched by an active transistor 433 when dc bias is required for the lamp 30, so that when the power of the lamp 30 is reduced, the lamp 30 is selectively dc biased when the lamp is unstable (with a serpentine), so as to stabilize the lamp. Thus, the supply of DC bias power can be saved without affecting the life of the lamp 30.
The operation mode of the dc bias compensation circuit 40 of the present invention is to connect the positive and negative levels of the dc bias in parallel at the output terminal of the electronic ballast 20 and the two terminals of the lamp 30, so that there are a high frequency high voltage ac power supply and a low voltage dc power supply on the lamp 30, and the ac and dc mixed power supply is commonly input to the lamp 30 to maintain stable light output; when the light output power of the lamp 30 is adjusted to half or less, the dc power supply in the hybrid power supply provides the effect of the dc bias compensation circuit 40, and the present invention not only improves the unstable light output of the conventional fluorescent lamp, but also increases the stable range of light adjustment, and significantly improves the light output of the fluorescent lamp.
Claims (6)
1. A light output stabilizing apparatus for a fluorescent lamp, comprising:
a light tube, a light source and a light source,
an electronic ballast for supplying a constant high-frequency voltage to the lamp, and
a DC bias compensation circuit connected to the lamp tube and the electronic stabilizer respectively;
the electronic stabilizer comprises an alternating current-to-direct current conversion circuit, a power factor correction circuit, a resonance conversion circuit, a lamp tube starting circuit and a dimming circuit; the AC-to-DC conversion circuit is externally connected with an AC power supply, the rectified DC power supply is connected with the power factor correction circuit, the rectified DC power supply is connected with the resonance conversion circuit after the power quality is improved, and the converted high-frequency AC power supply is respectively connected with the lamp tube starting circuit and the DC bias compensation circuit; the high-voltage high-frequency alternating current output of the lamp tube starting circuit and the direct current output of the direct current bias compensation circuit are connected in parallel and are transmitted to two ends of the lamp tube; the dimming circuit is connected between the lamp tube starting circuit and the resonance conversion circuit.
2. A light output stabilizing apparatus of a fluorescent lamp according to claim 1, wherein said ac-dc converting circuit is a filter rectifying circuit or a filter rectifying circuit connected in series with an anti-electromagnetic interference filter circuit.
3. A light output stabilizing apparatus of a fluorescent lamp according to claim 1, wherein said dc bias compensating circuit is a fixed dc bias compensating circuit, a switching dc bias compensating circuit, or a selective dc bias compensating circuit.
4. A light output stabilizing arrangement for a fluorescent lamp as claimed in claim 3, wherein said fixed dc bias compensation circuit is a full wave rectifying and filtering circuit comprising two diodes and an electrolytic capacitor, the input of which is connected to a sine wave output coupled from said ballast primary to the secondary, the fixed dc output of which is connected to the lamp terminals.
5. A light output stabilizing device for fluorescent lamp as claimed in claim 3, wherein said switching dc bias compensation circuit is a two-set half-wave rectifying and filtering circuit composed of two diodes and two electrolytic capacitors, whose inputs are connected to the sine wave output coupled from said ballast primary to the secondary, and whose one-way dc bias output from the one-set half-wave rectifying and filtering circuit is connected to both ends of the lamp tube; and the other reverse direction DC bias output of the other half-wave rectification and filtering circuit is connected to the two ends of the lamp tube.
6. A light output stabilizing arrangement for fluorescent lamps as claimed in claim 3, characterized in that said selective dc bias compensation circuit is constituted by a half-wave rectifier filter consisting of a diode and an electrolytic capacitor connected in series with the selective output of a transistor switch, the input connection of which is coupled from said ballast primary to the sine wave output of the secondary, the selectable dc output of which is connected across the lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96103302A CN1045241C (en) | 1996-03-28 | 1996-03-28 | Output light stabilizer for fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96103302A CN1045241C (en) | 1996-03-28 | 1996-03-28 | Output light stabilizer for fluorescent lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1160979A CN1160979A (en) | 1997-10-01 |
| CN1045241C true CN1045241C (en) | 1999-09-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96103302A Expired - Lifetime CN1045241C (en) | 1996-03-28 | 1996-03-28 | Output light stabilizer for fluorescent lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1045241C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI432096B (en) | 2011-12-27 | 2014-03-21 | Ind Tech Res Inst | Lamp control system, lamp power saving system and method therefor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203334U (en) * | 1985-08-15 | 1986-05-07 | 宋军 | Electron ballast for daylight lamp |
| CN86101777A (en) * | 1986-03-21 | 1987-04-15 | 王一况 | Super efficiency barretter |
-
1996
- 1996-03-28 CN CN96103302A patent/CN1045241C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85203334U (en) * | 1985-08-15 | 1986-05-07 | 宋军 | Electron ballast for daylight lamp |
| CN86101777A (en) * | 1986-03-21 | 1987-04-15 | 王一况 | Super efficiency barretter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1160979A (en) | 1997-10-01 |
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Granted publication date: 19990922 |
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