CN2699621Y - An electronic ballast with life limit protection - Google Patents
An electronic ballast with life limit protection Download PDFInfo
- Publication number
- CN2699621Y CN2699621Y CN 200420050304 CN200420050304U CN2699621Y CN 2699621 Y CN2699621 Y CN 2699621Y CN 200420050304 CN200420050304 CN 200420050304 CN 200420050304 U CN200420050304 U CN 200420050304U CN 2699621 Y CN2699621 Y CN 2699621Y
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- circuit
- filament
- current
- inverter circuit
- input
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- Expired - Fee Related
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Abstract
The utility model relates to an electronic ballast with life limit protection, which relates to an electronic ballast, particularly an electronic ballast with life limit protection. The electronic ballast with life limit protection is provided with a rectifying filter circuit, a direct current/alternating current inverter circuit, a resonance circuit and a feedback driving circuit. An input terminal of the rectifying filter circuit is externally connected with a power supply, and an output terminal of the rectifying filter circuit is connected with an input terminal of the direct current/alternating current inverter circuit. An output terminal of the direct current/alternating current inverter circuit is connected with an input terminal of the resonance circuit, and an output terminal of the resonance circuit is connected with a lamp tube. An input terminal of the feedback driving circuit is connected with a filament current loop of the lamp tube, and an output terminal of the feedback driving circuit is connected with the input terminal of the direct current/alternating current inverter circuit. Due to the fact that the utility model adopts a feedback driving system that filament current is led from the filament current loop of the lamp tube, particularly a filament capacitance loop is adopted by the filament current loop of the lamp tube, after a filament is disconnected, the contact of a filament capacitor and the lamp tube is interrupted, therefore, feedback driving also stops, the direct current/alternating current inverter circuit loses driving power, and a system stops working. The utility model has specific lines with many change, and can attain an effect so long as the utility model is combined with the current feedback driving of the filament.
Description
Technical field
The utility model relates to a kind of electric ballast, especially a kind of electric ballast with the defencive function of dying of old age.
Background technology
Existing electric ballast commonly used is provided with current rectifying and wave filtering circuit, AC/DC inverter circuit, resonant circuit etc.At present some ballasts particularly can also work on when filament disconnects when tube filament does not have the electronics powder, and at this moment fluorescent tube just might break and burning such as melts at phenomenon, causes the leakage of mercury, and this is a very serious potential safety hazard.
Summary of the invention
The utility model aims to provide a kind of defencive function of dying of old age that has, and can allow the out-of-work electric ballast of ballast when filament disconnects.
The utility model is provided with current rectifying and wave filtering circuit, AC/DC inverter circuit, resonant circuit and feedback drive circuit, current rectifying and wave filtering circuit input external power supply, rectification filter circuit output end connects AC/DC inverter circuit input, AC/DC inverter circuit output termination resonant circuit input, resonant circuit output termination fluorescent tube, feedback drive circuit input termination tube filament current circuit, feedback drive circuit output termination AC/DC inverter circuit input.
The feedback drive circuit can adopt the feedback driving transformer to form, and its elementary winding connects the tube filament current circuit, and secondary winding connects AC/DC inverter circuit input.Said tube filament current circuit can adopt the filament capacitance loop.
Owing to adopt the feedback drive system of drawing heater current from the tube filament current circuit, especially the tube filament current circuit adopts the filament capacitance loop, after filament disconnects, filament capacitance and fluorescent tube get in touch interruption, so driving, feedback also promptly stops, the AC/DC inverter circuit loses driving power, and system promptly quits work.Concrete circuit has a lot of variations, as long as just can be effective in conjunction with the driving of heater current feedback.
Description of drawings
Fig. 1 is a composition frame chart of the present utility model.
Fig. 2 is that the circuit of the utility model embodiment 1 is formed schematic diagram.
Fig. 3 is that the circuit of the utility model embodiment 2 is formed schematic diagram.
Embodiment
As shown in Figure 1, the utility model is provided with current rectifying and wave filtering circuit 1, AC/DC inverter circuit 2, LC series resonant circuit 3, filament capacitance circuit 4 and feedback drive circuit 5, current rectifying and wave filtering circuit 1 input external power supply, current rectifying and wave filtering circuit 1 output termination AC/DC inverter circuit 2 inputs, AC/DC inverter circuit 2 output termination LC series resonant circuits 3 inputs, LC series resonant circuit 3 output termination fluorescent tubes 6, filament capacitance circuit 4 connects feedback drive circuit 5 inputs, feedback drive circuit 5 output termination AC/DC inverter circuits 2 inputs.
The feedback drive circuit can adopt heater current feedback drive circuit, is made up of the feedback driving transformer, and its elementary winding is connected in series with the filament capacitance circuit, and secondary winding connects AC/DC inverter circuit input.Below provide embodiment of the present utility model.
As shown in Figure 2, S1, S2 are power input.Fuse FU, capacitor C and C1, inductance L 1 and rectifier diode D1, D2, D3, D4 form current rectifying and wave filtering circuit.Triode V1, V2 and its peripheral components are formed DC/AC inverter.Inductance L 2 and capacitor C 4, C6 form the LC series resonant circuit.Capacitor C 5 is the filament capacitance part with thermistor PTC.Elementary winding (main circle) 1-2 of feedback driving transformer T connects with C5 and PCT, secondary winding (inferior circle) 3-4, and 5-6 is the triode V1 of AC/DC inverter circuit, the V2 base stage provides driving power.So when filament disconnected, triode promptly lost driving power, whole system will quit work.
As shown in Figure 3, be to start circuit with the difference of Fig. 2, the charging resistor R1 of Fig. 2, R2 can also be to starting capacitor C 3 chargings when filament disconnects, bidirectional diode DB3 is triggered the base stage of triode V1, V2, and above-mentioned situation then can not take place in the resistance R 2 among Fig. 3, R7, R8, R9.
The model and the parameter that below provide each main components and parts among Fig. 2 are:
Triode V1, V2:13003 type;
Diode D1～D5:IN4007 type;
Thermistor PTC:100 Ω～1k Ω Ф 5.
The model of each main components and parts and parameter are among Fig. 3:
Triode V1, V2:13003 type;
Diode D1～D5:IN4007 type;
Resistance R 1, R2, R7～R9:330～680K Ω, R3, R5:5～20 Ω, R4, R6:0～1 Ω;
Thermistor PTC:100 Ω～1k Ω Ф 5.
Claims (4)
1, a kind of electric ballast with the protection of dying of old age; be provided with current rectifying and wave filtering circuit, AC/DC inverter circuit, resonant circuit; current rectifying and wave filtering circuit input external power supply; rectification filter circuit output end connects AC/DC inverter circuit input; AC/DC inverter circuit output termination resonant circuit input, resonant circuit output termination fluorescent tube is characterized in that also being provided with the feedback drive circuit; its input termination tube filament current circuit, output termination AC/DC inverter circuit input.
2, a kind of electric ballast with the protection of dying of old age as claimed in claim 1 is characterized in that feeding back drive circuit and adopts the feedback driving transformer, and its elementary winding connects the tube filament current circuit, and secondary winding connects AC/DC inverter circuit input.
3, a kind of electric ballast with the protection of dying of old age as claimed in claim 1 is characterized in that said tube filament current circuit adopts the filament capacitance loop, and the filament capacitance loop connects the input of feedback drive circuit.
4, as claim 2 and 3 described a kind of electric ballasts, it is characterized in that the elementary winding that feeds back driving transformer connects the filament capacitance loop with the protection of dying of old age.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420050304 CN2699621Y (en) | 2004-04-27 | 2004-04-27 | An electronic ballast with life limit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420050304 CN2699621Y (en) | 2004-04-27 | 2004-04-27 | An electronic ballast with life limit protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2699621Y true CN2699621Y (en) | 2005-05-11 |
Family
ID=34776849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420050304 Expired - Fee Related CN2699621Y (en) | 2004-04-27 | 2004-04-27 | An electronic ballast with life limit protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2699621Y (en) |
-
2004
- 2004-04-27 CN CN 200420050304 patent/CN2699621Y/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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050511 Termination date: 20120427 |