CN2308228Y - Preheating circuit of electronic ballast - Google Patents
Preheating circuit of electronic ballast Download PDFInfo
- Publication number
- CN2308228Y CN2308228Y CN 97234409 CN97234409U CN2308228Y CN 2308228 Y CN2308228 Y CN 2308228Y CN 97234409 CN97234409 CN 97234409 CN 97234409 U CN97234409 U CN 97234409U CN 2308228 Y CN2308228 Y CN 2308228Y
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- CN
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- Prior art keywords
- ptc
- circuit
- transformer
- preheating
- utility
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Abstract
The utility model relates to a preheating circuit of an electronic ballast, which belongs to the technical field of the electronic ballast. The purpose of the utility model is to provide a circuit realizing preheating fluorescent lamp filaments. The preheating circuit is composed of a transformer T1, a positive temperature coefficient thermistor PTC and clamping diodes D1, D2. The utility model is characterized in that the clamping diodes D1, D2 clamp B point voltage within the range of power supply voltage; the transformer T1 ensures no current to flow through in PTC after the lamp tube is lightened through a secondary winding n2; the PTC is connected between B point and the secondary winding n 2 to realize preheating.
Description
The utility model relates to the electric ballast field.
General fluorescent lamp all wants first with the abundant preheating of filament before lighting adding high pressure, if not preheating of filament, then burn-out life can reduce, and influences lamp tube service life.
The purpose of this utility model provides a kind of circuit of realizing the filament of fluorescent lamp preheating.
The purpose of this utility model is achieved in that in the series resonant circuit of electric ballast, transformer T1 is a resonant inductance, its primary and secondary end of the same name links together, and and filament of fluorescent lamp [2] joins, the other end of secondary winding n2 is connected with semistor PTC, the other end of PTC and clamp diode D1, the common point of D2 connects, diode D1, the D2 both positive and negative polarity join the series connection after be connected in parallel on electric ballast dc power supply two ends again, if ignore the forward voltage drop of diode, clamp diode D1 then, D2 just is limited in the terminal voltage of PTC in the supply voltage scope, the secondary n2 of transformer T1 and the turn ratio of elementary n1 should be between 0 to 1, i.e. 0＜n2: n1＜1.
Below in conjunction with the drawings and specific embodiments the utility model is further described.
After piling B1 rectification and capacitor C 1 filtering through rectifier bridge, 220 volts of civil powers produce dc power supply, resistance R 1, capacitor C 2 and bidirectional trigger diode DB3 form start-up circuit, toroidal transformer T2 drives triode BG1, the BG2 alternate conduction, resistance R 2, R3 is the base stage current-limiting resistance, diode D3 is a discharge diode, transformer T1 had both played resonance effect, also play metering function, and guarantee that semistor PTC no current behind lamp tube starting flows through, diode D1, D2 is a clamp diode, and [1] is fluorescent tube, and [2] and [3] are filaments, 3 resonance effects of capacitor C, capacitor C 4, C5 is a capacitance.
After just having begun energising, the circuit starting of oscillation, the elementary winding n1 of transformer T1 and capacitor C 3 produces resonance high-voltages, A point voltage amplitude fluctuation scope increased and exceed power range, promptly certain in a flash the B point voltage greater than V point voltage or B point voltage less than the G point voltage.In preferred embodiment of the utility model, the primary and secondary umber of turn of transformer T1 is than being n1: n2=100: 20, along with the continuation increase of A point voltage oscillation amplitude, semistor PTC begins to have electric current to flow through, and has so just suppressed the quick increase of A point voltage amplitude.PTC is because there is electric current to flow through, so temperature rising resistance increases.When the A point voltage rose to the starting voltage of fluorescent tube, tube starting was lighted, and lamp tube ends voltage descends, and this moment, warm finished.
After fluorescent tube is bright, possible A point voltage can be greater than the V point voltage or less than the G point voltage, but can guarantee that the A point voltage is bright back less than the V point voltage and greater than the G point voltage at lamp by the method that increases transformer secondary output and primary turns ratio, the bright back of lamp PTC flows through with regard to no current like this, has prolonged life-span of PTC and energy-conservation.
Claims (4)
1. electric ballast preheat circuit, this circuit is made up of transformer T1, semistor PTC and two clamp diode D1, D2, it is characterized in that: transformer T1 is the inductance in the series resonant circuit, the end of elementary n1 links to each other with filament [2] and also is connected with secondary n2, and continuous part end of the same name is identical, the other end of secondary n2 and semistor PTC join, the other end of PTC and clamp diode D1, D2 join, and are connected in parallel on the DC power supply two ends again after D1, the D2 series connection.
2. circuit according to claim 1 is characterized in that: transformer T1 is the inductance in the series resonant circuit, and primary and secondary end of the same name links to each other, and secondary and primary turns ratio is 0＜n2: n1＜1.
3. circuit according to claim 1 is characterized in that: semistor PTC is connected between secondary winding n2 and clamp diode D1, the D2.
4. circuit according to claim 1 is characterized in that: clamp diode D1 and D2 positive and negative electrode join the series connection after, be connected in parallel between the DC power supply again, and common point is connected with PTC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97234409 CN2308228Y (en) | 1997-04-28 | 1997-04-28 | Preheating circuit of electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97234409 CN2308228Y (en) | 1997-04-28 | 1997-04-28 | Preheating circuit of electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2308228Y true CN2308228Y (en) | 1999-02-17 |
Family
ID=33945773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97234409 Expired - Fee Related CN2308228Y (en) | 1997-04-28 | 1997-04-28 | Preheating circuit of electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2308228Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101568218B (en) * | 2008-04-24 | 2012-10-03 | 台达电子工业股份有限公司 | Stabilizer |
-
1997
- 1997-04-28 CN CN 97234409 patent/CN2308228Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101568218B (en) * | 2008-04-24 | 2012-10-03 | 台达电子工业股份有限公司 | Stabilizer |
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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 |