CN201323694Y - Energy-saving electronic ballast - Google Patents
Energy-saving electronic ballast Download PDFInfo
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- CN201323694Y CN201323694Y CNU2008202310642U CN200820231064U CN201323694Y CN 201323694 Y CN201323694 Y CN 201323694Y CN U2008202310642 U CNU2008202310642 U CN U2008202310642U CN 200820231064 U CN200820231064 U CN 200820231064U CN 201323694 Y CN201323694 Y CN 201323694Y
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- electronic ballast
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Abstract
The utility model discloses an energy-saving electronic ballast. The electronic ballast comprises a bridge rectifier filter circuit, an inverter circuit, an over-current and over-voltage protection circuit, an EMI filter circuit and a passive power factor correction circuit, wherein the over-current and over-voltage protection circuit is connected with the EMI filter circuit; the EMI filter circuit is connected with the bridge rectifier filter circuit; the bridge rectifier filter circuit is connected with the passive power factor correction circuit; and the passive power factor correction circuit is connected with the inverter circuit. As the over-current and over-voltage protection circuit, the EMI filter circuit and the passive power factor correction circuit are added in the energy-saving electronic ballast, the electricity saving effect is obvious and the light output is increased, therefore, the electronic ballast has the advantages of higher power factor, low power consumption and small current distortion. In addition, when the current and voltage are over higher, the protection for the electronic ballast can be realized; meanwhile, the higher harmonic generated by the electronic ballast is limited to be fed back to an electric fence, thereby inhibiting the pollution to the electric fence and the interference to other devices effectively.
Description
Technical field
The utility model relates to a kind of and the matching used electronic device of gaseous discharge lamp, specifically relates to a kind of electric ballast.
Background technology
Electric ballast is a kind of and the matching used electronic device of gaseous discharge lamp, has application extremely widely in industry and domestic lighting field.General electric ballast partly is made up of rectifying and wave-filtering part and inversion.It at first becomes high-frequency alternating current with industrial-frequency alternating current through current rectifying and wave filtering circuit and comes the gas discharge lamp load circuit works.Wherein in inversion part, balanced capacity is strong because the half-bridge resonance inverter circuit has, reliable operation, power switch pipe is withstand voltage series of advantages such as better, so obtained application widely in electric ballast.Sort circuit is simple in structure, adopts components and parts few, and cost is low, driving is effective, so the high-frequency ac electric ballast great majority that occur on present domestic market adopt sort circuit, but also there is following shortcoming in sort circuit:
(1) no filament pre-heating function easily produces filament electrode sputter effect, thereby reduces the useful life of filament, and fluorescent tube is short useful life.
(2) owing to directly power behind the civil power process rectifying and wave-filtering to half-bridge inversion circuit, can produce very strong higher harmonics disturbs, reduce the power factor of electric main input side, and reduction power supply power supplying efficiency, and sort circuit is when the electric ballast large tracts of land is used, can cause the potential shift of three-phase and four-line power supply grid, thereby also can cause the damage of power consumption equipment.
(3) can produce high order harmonic component because half-bridge inversion circuit is operated in high frequency switching inverter state following time, electrical network be produced corresponding magnetic radiation disturb, directly influence the operate as normal of other power consumption equipments.
(4) because circuit does not have protective circuit, in case mains powered breaks down, raise excessive or lamp load when fault such as breaking as line voltage, easily cause circuit to damage, also can the initiation fire accident in the time of seriously.
Summary of the invention
The purpose of this utility model provide a kind of safe, energy-conservation, can increase the gaseous discharge lamp electric ballast in useful life.
For achieving the above object, the utility model is by the following technical solutions:
The utility model comprises bridge rectifier filter circuit and inverter circuit; it also comprises overcurrent-overvoltage protecting circuit, EMI filter circuit and passive power factor correcting circuit; above-mentioned overcurrent-overvoltage protecting circuit is connected with the EMI filter circuit; the EMI filter circuit is connected with bridge rectifier filter circuit; bridge rectifier filter circuit is connected with passive power factor correcting circuit, and passive power factor correcting circuit is connected with inverter circuit.
Above-mentioned overcurrent-overvoltage protecting circuit is made of piezo-resistance and fusing resistor.
Above-mentioned inverter circuit is a half-bridge resonance formula inverter circuit.
Passive power factor correcting circuit mainly is made of current follow-up circuit.
Above-mentioned current follow-up circuit comprises the 7th electrochemical capacitor, the 8th electrochemical capacitor, the 8th diode, the 9th diode, the tenth diode and diode, and the negative electrode of the positive pole of above-mentioned the 7th electrochemical capacitor and the tenth diode is connected to the input of inverter circuit; The negative pole of above-mentioned the 8th electrochemical capacitor is connected the zero line in the electric ballast with the anode of diode; The negative pole of above-mentioned the 7th electrochemical capacitor is connected to the anode of the 9th diode and the negative electrode of diode; The positive pole of above-mentioned the 8th electrochemical capacitor is connected to the negative electrode of the 8th diode and the anode of the tenth diode; The anode of above-mentioned the 8th diode is connected to the negative electrode of the 9th diode and the input of load.
Adopt the utility model of technique scheme; because on the basis of original rectifying and wave-filtering part and inversion part; overcurrent-overvoltage protecting circuit, EMI filter circuit and passive power factor correcting circuit have been increased; thereby its power savings is remarkable; increased the output of light; have higher power factor, self low in energy consumption, and current distortion is little.When current/voltage is excessive, can also play a protective role to electric ballast, limit the high order harmonic component that electric ballast produces simultaneously and feed back in the electrical network, suppressed effectively to the pollution of electrical network with to the interference of other equipment.In addition, the utility model can also prolong the useful life of gaseous discharge lamp, and under lamp open circuit or abnormal conditions such as lamp is not pneumatic, lamp tube air leaking, its fail safe is without prejudice.
Description of drawings
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is a circuit diagram of the present utility model.
Embodiment
As shown in Figure 1, the utility model has increased overcurrent-overvoltage protecting circuit, EMI filter circuit and passive power factor correcting circuit on the basis of original bridge rectifier filter circuit and inverter circuit.Wherein, the civil power input circuit of 220V connects overcurrent-overvoltage protecting circuit; overcurrent-overvoltage protecting circuit is connected with the EMI filter circuit; the EMI filter circuit is connected with bridge rectifier filter circuit; bridge rectifier filter circuit is connected with passive power factor correcting circuit; passive power factor correcting circuit is connected with inverter circuit, and the output of inverter circuit is connected to gaseous discharge lamp L.In the utility model, inverter circuit adopts half-bridge resonance formula inverter circuit, and passive power factor correcting circuit mainly is made of current follow-up circuit.
As shown in Figure 2, the output of 220V civil power input circuit connects overcurrent-overvoltage protecting circuit.Above-mentioned overcurrent-overvoltage protecting circuit is made of piezo-resistance VR and fusing resistor FX.Fusing resistor FX mainly plays overcurrent protection, fusing when electric current is excessive, protection electric ballast; Piezo-resistance VR mainly plays the overvoltage protection effect, and when high voltage spikes or misphase access 380V voltage appearred in input, piezo-resistance VR became low-resistance by high resistant; finishing voltage absorbs; slicing and amplitude limit reach safety value or blow fusing resistor FX, and protective circuit is impaired.
The output of overcurrent-overvoltage protecting circuit connects the EMI filter circuit, and it mainly acts on is the interference of the high-frequency impulse of the extraneous electrical network of filtering to power supply, reduces the high order harmonic component electromagnetic interference to external world that electric ballast produces simultaneously in addition.In fact it utilizes the characteristic of inductance and electric capacity, and making frequency is that alternating current about 50Hz can pass through filter smoothly, and is higher than High-frequency Interference clutter more than the 50Hz with filtered device filtering.In the utility model, the EMI filter circuit is by capacitor C 3, C12, and C1, C2 and mutual inductor L2 constitute.Above-mentioned EMI filter circuit is a technology well known to those of ordinary skill in the art.
The output of EMI filter circuit connects bridge rectifier filter circuit.Above-mentioned bridge rectifier filter circuit is a technology well known to those of ordinary skill in the art.The output of bridge rectifier filter circuit connects passive power factor correcting circuit, passive power factor correcting circuit mainly is made of current follow-up circuit, current follow-up circuit is pressed in every half period based on reducing output DC, AC-input voltage is higher than the direct current output time elongates, the rectifier diode angle of flow just can increase like this, and the dead band of source current zero passage has just reduced.As shown in Figure 2, the output of bridge rectifier filter circuit is by diode D5, and D6 is connected to current follow-up circuit.Current follow-up circuit comprises the 7th electrochemical capacitor C7, the 8th electrochemical capacitor C8, the 8th diode D8, the 9th diode D9, the tenth diode D10 and diode D11.Wherein, the negative electrode of the positive pole of above-mentioned the 7th electrochemical capacitor C7 and the tenth diode D10 is connected to the input of inverter circuit; The anode of the negative pole of above-mentioned the 8th electrochemical capacitor C8 and diode D11 is connected the zero line in the electric ballast; The negative pole of above-mentioned the 7th electrochemical capacitor C7 is connected to the anode of the 9th diode D9 and the negative electrode of diode D11; The positive pole of above-mentioned the 8th electrochemical capacitor C8 is connected to the negative electrode of the 8th diode D8 and the anode of the tenth diode D10; The anode of above-mentioned the 8th diode D8 is connected to the negative electrode and the gaseous discharge lamp of the 9th diode.In order to understand the operation principle of this circuit better, the voltage between the positive pole of the negative pole of the 7th electrochemical capacitor C7 and the 8th electrochemical capacitor C8 is defined as VDC.After circuit works on power, in 0-90 degree phase place, power supply charges to electrochemical capacitor, its path is: diode D6, the 7th electrochemical capacitor C7, the 9th diode D9, the 8th diode D8, the 8th electrochemical capacitor D8, this road can make input voltage one-period 30～90 degree keep conducting substantially, the importing end of while gaseous discharge lamp is connected between the negative electrode of the anode of the 8th diode D8 and the 9th diode, and the importing end of gaseous discharge lamp is a high frequency voltage, and its minimum voltage will be far smaller than 1/2VDC, do not influence the angle of flow of input current so can raise the charging voltage of the 7th electrochemical capacitor C7, such benefit is exactly the DC component of raising among the VDC, thereby the crest that reduces gaseous discharge lamp L lamp current compares CF, and by the 8th electrochemical capacitor C8 is charged, raised the DC potential of the 8th electrochemical capacitor C8, such charging can not influence the angle of flow of input current equally.By compensating charge to the 7th electrochemical capacitor C7 and the 8th electrochemical capacitor C8, when not influencing the input current angle of flow, raised the DC component of VDC voltage, thereby the crest that has reduced gaseous discharge lamp L lamp current is than CF, the sharpest edges of Here it is current follow-up circuit.By passive power factor correcting circuit, high power factor has reduced the current harmonics distortion, reduces electromagnetic interference thereby reach, and improves the purpose of input side power factor value.
The output of passive power factor correcting circuit is connected to half-bridge resonance formula inverter circuit.Above-mentioned half-bridge resonance formula inverter circuit is a technology well known to those of ordinary skill in the art.
Half-bridge resonance formula inverter circuit is connected with gaseous discharge lamp L.In the utility model, be connected in parallel on the two ends of gaseous discharge lamp after power factor corrector PPFC and capacitor C 11 series connection, and at the two ends of capacitor C 11 another power factor corrector PPFC also in parallel.Like this, further improved the power factor of electric ballast.
In sum, the utility model can carry out over-current over-voltage protection, EMI filtering, improve power factor, reduces current harmonics distortion or the like, and the utility model also has pipeline start up by preheating and abnormity protection function simultaneously.Pipeline start up by preheating is promptly given filament pre-heating earlier before startup, the time, added high pressure rapidly to lamp after negative electrode reaches the electronics emission temperature greater than 0.4 second, made LC resonance, lamp is started light.And abnormal protection be meant electric ballast be in the open circuit or abnormal conditions such as lamp does not start, lamp tube air leaking under it is without prejudice safely, make circuit protection exactly.So the utility model both can improve the performance of electric ballast, can improve its functional reliability again.
Claims (5)
1, a kind of energy-saving electronic ballast; it comprises bridge rectifier filter circuit and inverter circuit; it is characterized in that: it also comprises overcurrent-overvoltage protecting circuit, EMI filter circuit and passive power factor correcting circuit; described overcurrent-overvoltage protecting circuit is connected with the EMI filter circuit; the EMI filter circuit is connected with bridge rectifier filter circuit; bridge rectifier filter circuit is connected with passive power factor correcting circuit, and passive power factor correcting circuit is connected with inverter circuit.
2, a kind of energy-saving electronic ballast according to claim 1 is characterized in that: described overcurrent-overvoltage protecting circuit is made of piezo-resistance (VR) and fusing resistor (FX).
3, a kind of energy-saving electronic ballast according to claim 1 is characterized in that: described inverter circuit is a half-bridge resonance formula inverter circuit.
4, a kind of energy-saving electronic ballast according to claim 1, it is characterized in that: described passive power factor correcting circuit mainly is made of current follow-up circuit.
5, a kind of energy-saving electronic ballast according to claim 4, it is characterized in that: described current follow-up circuit comprises the 7th electrochemical capacitor (C7), the 8th electrochemical capacitor (C8), the 8th diode (D8), the 9th diode (D9), the tenth diode (D10) and diode (D11), and the negative electrode of the positive pole of described the 7th electrochemical capacitor (C7) and the tenth diode (D10) is connected to the input of inverter circuit; The anode of the negative pole of described the 8th electrochemical capacitor (C8) and diode (D11) is connected the zero line in the electric ballast; The negative pole of described the 7th electrochemical capacitor (C7) is connected to the anode of the 9th diode (D9) and the negative electrode of diode (D11); The positive pole of described the 8th electrochemical capacitor (C8) is connected to the negative electrode of the 8th diode (D8) and the anode of the tenth diode (D10); The anode of described the 8th diode (D8) is connected to the negative electrode of the 9th diode (D9) and the input of load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202310642U CN201323694Y (en) | 2008-12-23 | 2008-12-23 | Energy-saving electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202310642U CN201323694Y (en) | 2008-12-23 | 2008-12-23 | Energy-saving electronic ballast |
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| Publication Number | Publication Date |
|---|---|
| CN201323694Y true CN201323694Y (en) | 2009-10-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202310642U Expired - Fee Related CN201323694Y (en) | 2008-12-23 | 2008-12-23 | Energy-saving electronic ballast |
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| Country | Link |
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| CN (1) | CN201323694Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102595736A (en) * | 2012-03-01 | 2012-07-18 | 杭州乐图光电科技有限公司 | LED (Light-Emitting Diode) driving power supply compatible to electronic ballast |
-
2008
- 2008-12-23 CN CNU2008202310642U patent/CN201323694Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102595736A (en) * | 2012-03-01 | 2012-07-18 | 杭州乐图光电科技有限公司 | LED (Light-Emitting Diode) driving power supply compatible to electronic ballast |
| CN102595736B (en) * | 2012-03-01 | 2014-09-17 | 杭州乐图光电科技有限公司 | LED (Light-Emitting Diode) driving power supply compatible to electronic ballast |
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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: 20091007 Termination date: 20101223 |