CN201435865Y - Preheating circuit of electronic ballast - Google Patents
Preheating circuit of electronic ballast Download PDFInfo
- Publication number
- CN201435865Y CN201435865Y CN2009201332988U CN200920133298U CN201435865Y CN 201435865 Y CN201435865 Y CN 201435865Y CN 2009201332988 U CN2009201332988 U CN 2009201332988U CN 200920133298 U CN200920133298 U CN 200920133298U CN 201435865 Y CN201435865 Y CN 201435865Y
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- Prior art keywords
- circuit
- preheat
- switch pipe
- resistance
- fluorescent lamp
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Abstract
The utility model discloses a preheating circuit of electronic ballast, which is used for providing preheating current for a fluorescent lamp. One end of a first filament of the fluorescent lamp is connected with a main coil of an electric inductor while the other end is connected with a second filament of the fluorescent lamp through a first capacitor. The preheating circuit further comprises a rectifier bridge circuit, two ends of the first capacitor are respectively connected with two input ends of the rectifier bridge circuit, a source electrode of a second switching tube is connected witha negative output end of the rectifier bridge circuit, a drain electrode of the second switching tube is connected with a positive output end of the rectifier bridge circuit through a seventh adjusting resistor and used for controlling the magnitude of preheating current on the fluorescent lamp, and a secondary coil of the electric inductor is connected with a grid electrode of the second switching tube through a control circuit and used for controlling turn-on time of the second switching tube. The preheating circuit can meet requirements of preheating current or preheating energy required by fluorescent lamp tubes through adjusting preheating time and preheating current, and then truly achieves the purpose of saving energy and prolonging the service life of the fluorescent lamp.
Description
Technical field
The utility model relates to the lighting apparatus field, relates in particular to a kind of preheat circuit of electric ballast.
Background technology
Existing electric ballast generally is not with preheat circuit, and cold puncture when causing fluorescent tube to be opened very easily damages fluorescent tube.Some has preheat circuit, also is only to use the PTC thermistor, as shown in Figure 1; Or adopt PTC thermistor serial connection electric capacity to come preheating, as shown in Figure 2.
Its weak point is: when 1, electric ballast starts, owing to there is not good preheating to fluorescent tube filament, make it impaired easily, lamp holder turns black too early, has influenced the useful life of fluorescent tube; When 2, fluorescent tube was worked, PTC was in the conduction and the condition of high temperature all the time, has both increased power consumption, also influences the life-span of electric ballast; 3, press the fluorescent tube high, that caliber is thin for pipe, as the T5 fluorescent tube, its life-span influence is more obvious.
Therefore, be necessary prior art is improved.
The utility model content
The purpose of this utility model is, at the above-mentioned shortcoming of prior art, provides a kind of adjustable warm-up time and preheat curent, can carry out the preheat circuit of abundant preheating with comparatively ideal wave mode to fluorescent tube filament.
The technical solution of the utility model is:
A kind of preheat circuit of electric ballast is provided, be used for providing preheat curent to fluorescent lamp, wherein, one end of first filament of fluorescent lamp connects the main coil of inductance, the other end connects second filament of fluorescent lamp by first electric capacity, wherein, also comprise a rectifier circuit, the described first electric capacity two ends connect two inputs of described rectifier circuit respectively;
The source electrode of described second switch pipe connects the negative output terminal of described rectifier circuit; The drain electrode of described second switch pipe is regulated the positive output end that resistance connects described rectifier circuit by the 7th, is used to control the size that is applied to preheat curent on the fluorescent lamp;
The secondary coil of inductance connects the grid of described second switch pipe by a control circuit, is used to control the ON time of described second switch pipe.
Preheat circuit described in the utility model, wherein, described control circuit comprises first switching tube, and the collector electrode of described first switching tube connects the grid of described second switch pipe, and the base stage of described first switching tube is by the 4th charging capacitor ground connection; The secondary coil of inductance connects a resistor network by the 5th diode, and being used for provides bias voltage to described first switching tube and second switch pipe.
Preheat circuit described in the utility model, wherein, the positive pole of described the 5th diode connects the secondary coil of described inductance, and negative pole is by the 3rd filter capacitor ground connection.
Preheat circuit described in the utility model, wherein, described preheat circuit comprises that also five guarantees protect resistance, described five guarantees are protected between two outputs that resistance is connected described rectifier circuit, are used to protect described second switch pipe.
Preheat circuit described in the utility model, wherein, described preheat circuit also comprises the 6th protective resistance, described the 6th protective resistance and described five guarantees are protected between two outputs that resistance is connected in series in described rectifier circuit, are used to protect described second switch pipe.
Preheat circuit described in the utility model, wherein, described preheat circuit also comprises second filter capacitor, is used to protect described second switch pipe; Described second filter capacitor is connected between two outputs of described rectifier circuit.
Adopt the beneficial effect of preheat circuit of the present utility model to be: the switch number of times of fluorescent tube is not damaged greater than 100,000 times, and light the back preheat circuit at fluorescent tube and be in complete cut-off state, reduce power consumption, eliminate the lamp tube ends phenomenon of blackout too early, the purpose that can really reach energy-conservation and prolong the fluorescent tube life-span.
Description of drawings
Fig. 1 is the preheat circuit figure one of the electric ballast of prior art;
Fig. 2 is the preheat circuit figure two of the electric ballast of prior art;
Fig. 3 is the preheat circuit figure of the electric ballast of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, will be described in detail preferred embodiment of the present utility model.
The preheat circuit of electric ballast of the present utility model is used for providing preheat curent to fluorescent lamp, as shown in Figure 3, wherein, first filament, one end of fluorescent lamp connects the main coil L1 of inductance, the other end connects second filament by first capacitor C 1, the main coil L1 of this inductance and first capacitor C 1 are formed series resonance, for Filament of fluorescent lamp provides energy, light fluorescent lamp.This preheat circuit also comprises a rectifier circuit of being made up of the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4, and first capacitor C, 1 two ends connect two inputs of rectifier circuit respectively.The source electrode of second switch pipe S2 connects the negative output terminal of rectifier circuit.The drain electrode of second switch pipe S2 is regulated the positive output end that resistance connects rectifier circuit by the 7th, is used for controlling the size that is applied to preheat curent on the filament by regulating the 7th size of regulating resistance R 7.The secondary coil L2 of inductance is used to control the ON time of second switch pipe S2 by the grid of control circuit connection second switch pipe S2.In the present embodiment, the 7th regulates resistance R 7 can be set to adjustable resistance, also can be set to fixed resistance.
In the present embodiment, foregoing control circuit comprises the first switching tube S1, and as shown in Figure 3, the collector electrode of the first switching tube S1 connects the grid of second switch pipe S2, the base stage of the first switching tube S1 is by the 4th charging capacitor C4 ground connection, and wherein the 4th charging capacitor C4 specifically can be electrochemical capacitor; The secondary coil L2 of inductance connects a resistor network by the 5th diode D5, and being used for provides bias voltage to the first switching tube S1 and second switch pipe S2.The positive pole of the 5th diode D5 connects the secondary coil L2 of inductance, and negative pole is by the 3rd filter capacitor C3 ground connection.Wherein the 3rd filter capacitor spike of can filtering coming from D5, protection be by the first switching tube S1 and the 4th charge and discharge capacitance, and the preheat curent time adjusting circuit operate as normal that constitutes of resistor network.
Resistor network in the present embodiment specifically can comprise first resistance R 1, second resistance R 2, the 3rd resistance R 3 and the 4th resistance R 4, as shown in Figure 3.Wherein, an end of first resistance R 1 connects the negative pole of the 5th diode D5, and the other end is by second resistance R, 2 ground connection, and the base stage of the first switching tube S1 is connected on the tie point of first resistance R 1 and second resistance R 2, and being used for provides bias current to the first switching tube S1.One end of the 3rd resistance R 3 connects the negative pole of the 5th diode D5, and the other end is by the 4th resistance R 4 ground connection, and the grid of second switch pipe S2 is connected on the tie point of the 3rd resistance R 3 and the 4th resistance R 4.The 3rd resistance R 3 and 4 effects of the 4th resistance R mainly are to provide suitable grid source (G-S) voltage to second switch pipe S2, make second switch pipe S2 be operated in normal condition in warm.
Preheat circuit in the present embodiment also can comprise the second filter capacitor C2; be connected between two outputs of rectifier circuit; as shown in Figure 3; be used for the high-frequency ac pulse signal of filtering from rectifier circuit; prevent its impact to second switch pipe S2; protection second switch pipe S2 is with the stability of the preheat circuit that improves present embodiment.
Preheat circuit in the present embodiment can comprise that also five guarantees protect resistance R 5; described preheat circuit comprises that also five guarantees protect resistance R 5; as shown in Figure 3; these five guarantees are protected between two outputs that resistance R 5 is connected rectifier circuit; its significant feature is to suppress the source electrode of second switch pipe S2 and the direct current spike between the drain electrode (S-D); and after preheating is finished, second switch pipe S2 is discharged; play protective effect to second switch pipe S2; according to actual needs; can adjust its resistance, perhaps the quantity of resistance.As according to the size of current of being born, also can protect series connection the 6th resistance R 6 on the resistance R 5 in five guarantees, as shown in Figure 3, to adapt to protection needs under the different situations.
In the preheat circuit of present embodiment, preheat curent size control principle to filament is: when the electric ballast energized starts, preheat curent is through main coil L1, the fluorescent tube filament of inductance, by the first diode D1, the second diode D2, the 3rd diode D3 and the 4th diode D4 rectification, preheat curent is regulated resistance R 7 through the 7th, through second switch pipe S2, first filament and second filament to fluorescent tube heat, therefore can be by regulating the resistance of the 7th adjusting resistance R 7, control is applied to the size of preheat curent on the fluorescent tube filament.
In the preheat circuit of present embodiment, warm-up time is mainly by the control first switching tube S1 conducting, second switch pipe S2 ends and realizes, its control principle is: when the electric ballast energized starts, the secondary coil L2 of inductance senses certain voltage, by the 5th diode D5 rectification, through the 3rd filter capacitor C3 filtering, by first resistance R 1, first resistance R 2 provides bias voltage to S1, and give the 4th charging capacitor C4 charging, when the 4th charging capacitor C4 is charged to 0.7V, the first switching tube S1 conducting, thus second switch pipe S2 is ended, and preheating finishes.Therefore can learn, the control of filament preheating time mainly is to be decided by the charging interval of the 4th charging capacitor C4, and the number of turn of the secondary coil L2 of resistance that can be by adjusting first resistance R 1 and second resistance R 2, the capacity of the 4th charging capacitor C4, inductance realizes.
Adopt the preheat circuit of electric ballast of the present utility model, can to satisfy needed preheat curent of fluorescent tube or pre-thermal energy, the switch number of times of fluorescent tube not damaged greater than 100,000 times by regulating warm-up time and preheat curent.And light the back preheat circuit at fluorescent tube and be in complete cut-off state, reduced power consumption, eliminated the lamp tube ends phenomenon of blackout too early, the purpose that can really reach energy-conservation and prolong the fluorescent tube life-span.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improvement and conversion all should belong to the protection range of the utility model claims.
Claims (6)
1, a kind of preheat circuit of electric ballast, be used for providing preheat curent to fluorescent lamp, wherein, one end of first filament of fluorescent lamp connects the main coil of inductance, the other end connects second filament of fluorescent lamp by first electric capacity, it is characterized in that, also comprise a rectifier circuit, the described first electric capacity two ends connect two inputs of described rectifier circuit respectively;
The source electrode of described second switch pipe connects the negative output terminal of described rectifier circuit; The drain electrode of described second switch pipe is regulated the positive output end that resistance connects described rectifier circuit by the 7th, is used to control the size that is applied to preheat curent on the fluorescent lamp;
The secondary coil of inductance connects the grid of described second switch pipe by a control circuit, is used to control the ON time of described second switch pipe.
2, preheat circuit as claimed in claim 1 is characterized in that, described control circuit comprises first switching tube, and the collector electrode of described first switching tube connects the grid of described second switch pipe, and the base stage of described first switching tube is by the 4th charging capacitor ground connection; The secondary coil of inductance connects a resistor network by the 5th diode, and being used for provides bias voltage to described first switching tube and second switch pipe.
3, preheat circuit as claimed in claim 2 is characterized in that, the positive pole of described the 5th diode connects the secondary coil of described inductance, and negative pole is by the 3rd filter capacitor ground connection.
4, preheat circuit as claimed in claim 1 is characterized in that, described preheat circuit comprises that also five guarantees protect resistance, and described five guarantees are protected between two outputs that resistance is connected described rectifier circuit, are used to protect described second switch pipe.
5, preheat circuit as claimed in claim 4; it is characterized in that; described preheat circuit also comprises the 6th protective resistance, and described the 6th protective resistance and described five guarantees are protected between two outputs that resistance is connected in series in described rectifier circuit, are used to protect described second switch pipe.
6, preheat circuit as claimed in claim 1 is characterized in that, described preheat circuit also comprises second filter capacitor, and described second filter capacitor is connected between two outputs of described rectifier circuit, is used to protect described second switch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201332988U CN201435865Y (en) | 2009-06-24 | 2009-06-24 | Preheating circuit of electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201332988U CN201435865Y (en) | 2009-06-24 | 2009-06-24 | Preheating circuit of electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201435865Y true CN201435865Y (en) | 2010-03-31 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201332988U Expired - Fee Related CN201435865Y (en) | 2009-06-24 | 2009-06-24 | Preheating circuit of electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201435865Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102264185A (en) * | 2011-08-19 | 2011-11-30 | 青岛中科天为光电有限公司 | Electronic ballast for fluorescent lamp |
| CN102264184A (en) * | 2011-08-19 | 2011-11-30 | 青岛中科天为光电有限公司 | Electronic ballast for fluorescent lamp |
-
2009
- 2009-06-24 CN CN2009201332988U patent/CN201435865Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102264185A (en) * | 2011-08-19 | 2011-11-30 | 青岛中科天为光电有限公司 | Electronic ballast for fluorescent lamp |
| CN102264184A (en) * | 2011-08-19 | 2011-11-30 | 青岛中科天为光电有限公司 | Electronic ballast for fluorescent lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100331 Termination date: 20170624 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |