CN204206590U - Passive electronic ballast abnormality protective circuit - Google Patents
Passive electronic ballast abnormality protective circuit Download PDFInfo
- Publication number
- CN204206590U CN204206590U CN201420638762.XU CN201420638762U CN204206590U CN 204206590 U CN204206590 U CN 204206590U CN 201420638762 U CN201420638762 U CN 201420638762U CN 204206590 U CN204206590 U CN 204206590U
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- circuit
- bridge inversion
- electronic ballast
- passive electronic
- abnormal current
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Abstract
The utility model discloses a kind of passive electronic ballast abnormality protective circuit, comprise the abnormal current sample circuit be connected with Filament of fluorescent lamp, described abnormal current sample circuit is connected with halfwave rectifier booster circuit, described rectification boosting circuit is connected with semi-bridge inversion starting or stopping control circuit, and described semi-bridge inversion starting or stopping control circuit is connected with the half-bridge inversion circuit of passive electronic ballast; During work, the abnormal current of abnormal current sample circuit to fluorescent lamp samples, and sampling current, through the process of halfwave rectifier booster circuit and semi-bridge inversion starting or stopping control circuit, controls half-bridge inversion circuit work or failure of oscillation; The utility model adopts current sampling, and the speed of protective circuit improves, and has no-spark, noiselessness; Efficiency is high, low cost and other advantages.
Description
Technical field
The utility model relates to a kind of ballast circuit, particularly relates to a kind of protective circuit of electric ballast.
Background technology
Electronic ballast fluorescent lamp as a kind of generally acknowledged green illumination product, than ordinary inductor ballast fluorescent lamp have light efficiency high, without many clear superiorities such as stroboscopic, energy-saving effect be remarkable; But portions of electronics ballast also has the shortcoming that failure rate is higher, for terminal client, electric ballast has become (relative Inductive ballast) disposable products of a kind of high cost.
Producing the one of the main reasons of the problems referred to above is do not take reliable safeguard measure for the abnormality of electric ballast, thus makes electric ballast finishing and scrap with lamp tube service life.
The operation principle of electric ballast as shown in Figure 2, under normal circumstances, after electric ballast energising, inverter is together with the filament composition series resonant circuit at inductance L, electric capacity C, fluorescent lamp two ends, electric capacity two ends produce high pressure within a certain period of time, this high voltage causes fluorescent lamp arc discharge to make fluorescent lamp starting, then detuning of resonant circuit, and fluorescent lamp enters stable lights state.
When there is the abnormalities such as the aging or lamp tube air leaking of fluorescent tube, fluorescent lamp can not normally start, circuit is above in resonance condition (unless filament blow or electric ballast damage) always, the electric current that inverter exports constantly increases, and this electric current can be elevated to 3 ~ 5 times of normal current usually.If at this moment do not take effective safeguard measure, high risks can be caused.First, excessive electric current can cause burning because of overload as the triode of switch or field effect transistor and other peripheral components in inverter, even cause smolder, the accident such as explosion.Simultaneously, lamp base can form long very high voltage to ground wire or center line, for the electric ballast of 20W, 36W, 40W and other most of GB/non-beacon light, this voltage often reaches one kilovolt or higher, this is not only GB GB15143 and strictly forbids, and entail dangers to personal safety and safety of property.
Self-excited oscillation circuit is adopted to make the electronic ballast for fluoresent lamp produced, also apply very wide at present at home, develop again in recent years and added some high frequency feedback methods on low power factor circuit, power factor is improved, individual harmonic current is all up to standard, and becomes medium and high classes product and apply wider.But the reliability of the less stable of these low cost high powered factor electronic ballasts, particularly protective circuit with adopt integrated circuit separate-excited electronic ballast performance cannot compared with.In self-excited circuit, protective circuit is very important, and various damage phenomenon occurs the unreliable ballast that will cause of protective circuit in actual applications.
Be illustrated in figure 3 the protective circuit structure chart of now conventional electric ballast, its operation principle is: during abnormal condition of lamp tube, resonant inductance L and resonant capacitance C4 series resonance produce high-voltage signal, this high-voltage signal is as filament sampling voltage, electric capacity C2 samples, resistance R4 and resistance R5 step-down dividing potential drop, diode D1 halfwave rectifier, electrochemical capacitor C3 charges, decomposition voltage rises to trigger tube starting resistor (28V ~ 36V), bidirectional trigger diode DB3 conducting, controllable silicon SCR conducting, triode Q3 conducting, under half-bridge inversion circuit, pipe base current is over the ground drop-down, half-bridge inversion circuit failure of oscillation.This circuit has contactless operation, no-spark, noiselessness, efficiency is high and cost is low advantage; The shortcoming of this circuit mainly contains: static and dynamic overload capacity is poor; Protection voltage samples at tube cathode, unhappy to little electrolysis charging rate; Easily be disturbed; One is needed to maintain electric current by SCR control; In rectifying effect, do not reach the trigger voltage of trigger tube, can not meet the standard-required of T5 fluorescent tube, consistency is poor.
Utility model content
Technical problem to be solved in the utility model is to provide the passive electronic ballast abnormality protective circuit that a kind of cost is low, reliability is high.
For solving the problems of the technologies described above; the technical solution of the utility model is: passive electronic ballast abnormality protective circuit; comprise the abnormal current sample circuit be connected with Filament of fluorescent lamp; described abnormal current sample circuit is connected with halfwave rectifier booster circuit; described rectification boosting circuit is connected with semi-bridge inversion starting or stopping control circuit, and described semi-bridge inversion starting or stopping control circuit is connected with the half-bridge inversion circuit of passive electronic ballast.
As the preferred technical scheme of one, described abnormal current sample circuit comprises the electric capacity C4 and inductor winding L that connect with the filament of described fluorescent lamp.
As the preferred technical scheme of one, described halfwave rectifier booster circuit comprises the electrochemical capacitor C3 and diode D1 that are connected with described abnormal current sample circuit, and the positive pole of described diode D1 is connected with described abnormal current sample circuit.
As the preferred technical scheme of one, described semi-bridge inversion starting or stopping control circuit comprises triode Q3 and triode Q4, the base stage of described triode Q3 is connected with the collector electrode of described triode Q4, and the base stage of described triode Q4 is connected with the collector electrode of described triode Q3; The base stage of described triode Q4 is connected with voltage stabilizing didoe D4.
As the preferred technical scheme of one, between described semi-bridge inversion starting or stopping control circuit and described half-bridge inversion circuit, be connected with bidirectional trigger diode DB3.
Owing to have employed technique scheme, passive electronic ballast abnormality protective circuit, comprise the abnormal current sample circuit be connected with Filament of fluorescent lamp, described abnormal current sample circuit is connected with halfwave rectifier booster circuit, described rectification boosting circuit is connected with semi-bridge inversion starting or stopping control circuit, and described semi-bridge inversion starting or stopping control circuit is connected with the half-bridge inversion circuit of passive electronic ballast; During work, the abnormal current of abnormal current sample circuit to fluorescent lamp samples, and sampling current, through the process of halfwave rectifier booster circuit and semi-bridge inversion starting or stopping control circuit, controls half-bridge inversion circuit work or failure of oscillation; The utility model adopts current sampling, and the speed of protective circuit improves, and has no-spark, noiselessness; Efficiency is high, low cost and other advantages.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment;
Fig. 2 is the fundamental diagram of electric ballast in the utility model prior art;
Fig. 3 is the protective circuit figure of electric ballast in the utility model prior art;
Fig. 4 is the EMI filter circuit figure of the utility model embodiment;
Fig. 5 is the PPFC circuit diagram of the utility model embodiment;
Fig. 6 is the half-bridge inversion circuit of the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples, set forth the utility model further.In the following detailed description, the mode only by illustrating describes some one exemplary embodiment of the present utility model.Undoubtedly, those of ordinary skill in the art can recognize, when not departing from spirit and scope of the present utility model, can revise by various different mode to described embodiment.Therefore, accompanying drawing is illustrative with being described in essence, instead of for limiting the protection range of claim.
As shown in Figure 1, passive electronic ballast abnormality protective circuit, comprises the abnormal current sample circuit be connected with Filament of fluorescent lamp, and described abnormal current sample circuit comprises the electric capacity C4 and inductor winding L that connect with the filament of described fluorescent lamp; Described abnormal current sample circuit is connected with halfwave rectifier booster circuit, described halfwave rectifier booster circuit comprises the electrochemical capacitor C3 and diode D1 that are connected with described abnormal current sample circuit, and the positive pole of described diode D1 is connected with described abnormal current sample circuit; Described rectification boosting circuit is connected with semi-bridge inversion starting or stopping control circuit, described semi-bridge inversion starting or stopping control circuit comprises triode Q3 and triode Q4, the base stage of described triode Q3 is connected with the collector electrode of described triode Q4, and the base stage of described triode Q4 is connected with the collector electrode of described triode Q3; The base stage of described triode Q4 is connected with voltage stabilizing didoe D4; Described semi-bridge inversion starting or stopping control circuit is connected with the half-bridge inversion circuit of passive electronic ballast, be connected with bidirectional trigger diode DB3 between described semi-bridge inversion starting or stopping control circuit and described half-bridge inversion circuit, bidirectional trigger diode DB3 is by electric capacity C1 ground connection.As shown in Figure 4, as shown in Figure 5, half-bridge inversion circuit as shown in Figure 6, repeats no more PPFC circuit EMI filter circuit in Fig. 1 here.
Operation principle: during abnormal condition of lamp tube, the auxiliary winding current sampling of resonant inductance winding L, namely, after abnormal generation, resonant inductance L and resonant capacitance C4 produces series resonance, produces big current signal, diode D1 halfwave rectifier, electrochemical capacitor C3 charges, and decomposition voltage rises to trigger tube D4 starting resistor, triode Q3 and triode Q4 conducting, the lower pipe base current of half-bridge inversion circuit over the ground drop-down and stop trigger, half-bridge inversion circuit failure of oscillation.
Compared with prior art, the utility model has following advantage: no-spark, noiselessness; Efficiency is high, and cost is low; The utility model does not need SCR control; adopt current sampling, the speed of protective circuit improves, and accesses capacitance on the main circuit; also solve the problem of the trigger voltage not reaching trigger tube in rectifying effect, reliability improves.
More than show and describe general principle of the present utility model, principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. passive electronic ballast abnormality protective circuit; it is characterized in that: comprise the abnormal current sample circuit be connected with Filament of fluorescent lamp; described abnormal current sample circuit is connected with halfwave rectifier booster circuit; described rectification boosting circuit is connected with semi-bridge inversion starting or stopping control circuit, and described semi-bridge inversion starting or stopping control circuit is connected with the half-bridge inversion circuit of passive electronic ballast.
2. passive electronic ballast abnormality protective circuit as claimed in claim 1, is characterized in that: described abnormal current sample circuit comprises the electric capacity C4 and inductor winding L that connect with the filament of described fluorescent lamp.
3. passive electronic ballast abnormality protective circuit as claimed in claim 1; it is characterized in that: described halfwave rectifier booster circuit comprises the electrochemical capacitor C3 and diode D1 that are connected with described abnormal current sample circuit, and the positive pole of described diode D1 is connected with described abnormal current sample circuit.
4. passive electronic ballast abnormality protective circuit as claimed in claim 1, it is characterized in that: described semi-bridge inversion starting or stopping control circuit comprises triode Q3 and triode Q4, the base stage of described triode Q3 is connected with the collector electrode of described triode Q4, and the base stage of described triode Q4 is connected with the collector electrode of described triode Q3; The base stage of described triode Q4 is connected with voltage stabilizing didoe D4.
5. the passive electronic ballast abnormality protective circuit as described in claim 1,2,3 or 4, is characterized in that: be connected with bidirectional trigger diode DB3 between described semi-bridge inversion starting or stopping control circuit and described half-bridge inversion circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420638762.XU CN204206590U (en) | 2014-10-30 | 2014-10-30 | Passive electronic ballast abnormality protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420638762.XU CN204206590U (en) | 2014-10-30 | 2014-10-30 | Passive electronic ballast abnormality protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204206590U true CN204206590U (en) | 2015-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420638762.XU Expired - Fee Related CN204206590U (en) | 2014-10-30 | 2014-10-30 | Passive electronic ballast abnormality protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204206590U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728715A (en) * | 2019-01-09 | 2019-05-07 | 全球能源互联网研究院有限公司 | A kind of start-up circuit and draw-out power supply of draw-out power supply |
-
2014
- 2014-10-30 CN CN201420638762.XU patent/CN204206590U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109728715A (en) * | 2019-01-09 | 2019-05-07 | 全球能源互联网研究院有限公司 | A kind of start-up circuit and draw-out power supply of draw-out power supply |
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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: 20150311 Termination date: 20181030 |
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| CF01 | Termination of patent right due to non-payment of annual fee |