CN202026517U - Electronic ballast - Google Patents
Electronic ballast Download PDFInfo
- Publication number
- CN202026517U CN202026517U CN2011200668024U CN201120066802U CN202026517U CN 202026517 U CN202026517 U CN 202026517U CN 2011200668024 U CN2011200668024 U CN 2011200668024U CN 201120066802 U CN201120066802 U CN 201120066802U CN 202026517 U CN202026517 U CN 202026517U
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- switch element
- circuit
- electric
- electric capacity
- inverter circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
The utility model provides an electronic ballast, comprising a rectification circuit used for carrying out rectification on alternating current and for generating direct current, an inverter circuit used for transiting the direct current to alternating current, and an output circuit used for providing the alternating current to a load, wherein the output circuit is connected with the inverter circuit and the load respectively. The electronic ballast further comprises a direct current filtering circuit used for carrying out filtering on the direct current generated by the rectification circuit, and the direct current filtering circuit is arranged between the rectification circuit and the inverter circuit. The electronic ballast is small in size and low in cost.
Description
Technical field
The utility model relates to the electric ballast field, relates in particular to a kind of small size, electric ballast cheaply.
Background technology
Energy-conservation ballast for lamp mainly contains two kinds, and a kind of is Inductive ballast, and it is by the inert gas in the power saving fluorescent lamps two ends apply the high-voltage breakdown fluorescent tube, thereby the fluorescent lamp powder is lighted.Another kind is an electric ballast, and it lights electricity-saving lamp by the high-frequency alternating current that serial or parallel connection resonance forms.Inductive ballast is eliminated by market gradually owing to have many shortcomings such as volume is big, Heavy Weight, energy consumption is big, power factor (PF) is low.On the contrary, the electric ballast that replaces Inductive ballast has plurality of advantages such as volume is little, in light weight, power factor (PF) height, thereby is subjected to consumers in general's favor.
Yet present electric ballast still remains improvements, and the RFI filter of traditional circuit is directly to be added in alternating current circuit, be before the AC/DC rectification circuit,, often need to adopt the capacitor filtering of 630V because the interchange of 220V is imported, capacitor size is bigger, and cost is also than higher.
The utility model content
The purpose of this utility model provides a kind of electric ballast, to solve the problem that existing electric ballast size is big, cost is high.
The utility model proposes a kind of electric ballast, comprise and be used for alternating current is carried out rectification, to produce a galvanic rectification circuit, to be used for direct current is converted to an inverter circuit of alternating current, be used for alternating current is offered an output circuit of load, this output circuit links to each other with this inverter circuit and load respectively, it is characterized in that, it comprises also and is used for a direct current filter circuit that the direct current that this rectification circuit produces is carried out filtering that this DC filtering circuit is arranged between this rectification circuit and this inverter circuit.
Further, this DC filtering circuit comprises a filter capacitor and a filter inductance, and this filter inductance is connected in series with this rectification circuit, and this filter capacitor and this filter inductance also connect, and the withstand voltage of this filter capacitor is 250V.
Further, this inverter circuit comprises a transformer, one first switch element, one second switch element, one starts an electric capacity and a starting switch, this first switch element and this second switch element all have three terminals, second end of this first switch element is connected with the 3rd end of this second switch element, one end on the former limit of this transformer is connected with the 3rd end of second end of this first switch element and this second switch element, the other end is connected with this output circuit, first secondary of this transformer is connected between first end and the 3rd end of this first switch element, its end of the same name is connected with the 3rd end, second secondary of this transformer is connected between first end and the 3rd end of this second switch element, and its end of the same name is connected with first end.
Further, this first switch element and this second switch element are triode, and first end of the two is a base stage, and second end is a collector electrode, and the 3rd end is an emitter.
Further, this inverter circuit also comprises first end that is connected to this first switch element and this second switch element and two resistance between the 3rd end.
Further, this inverter circuit also comprises second end that is connected in this second switch element and the electric capacity between the 3rd end.
Further, this inverter circuit also comprises first end that is connected in this first switch element and the diode between second end, and the anode of this diode is connected with first end of this first switch element, and negative electrode is connected with second end of this first switch element.
Further, this output circuit comprises one first electric capacity, one second electric capacity, one the 3rd electric capacity and choking-winding, one end of this first electric capacity and this second electric capacity is connected with the both positive and negative polarity of this rectification circuit respectively, the other end is connected with load, one end of this choking-winding is connected with the former limit of this transformer, the other end is connected to the other end of load, and the 3rd electric capacity is parallel to the load two ends.
Further, this rectification circuit is a bridge rectifier.
With respect to prior art, the beneficial effects of the utility model are: the circuit of electric ballast of the present utility model is compared with the circuit of other electric ballast, adopt direct current component filtering, so the withstand voltage of filter capacitor is that 250V gets final product, also reduced cost when dwindling capacitor size.In addition, the utility model uses components and parts few, and the power factor (PF) height is applied widely.
Description of drawings
Fig. 1 is a kind of example structure figure of the utility model electric ballast;
Fig. 2 is a kind of embodiment circuit diagram of the utility model electric ballast.
Embodiment
Below in conjunction with accompanying drawing, specify the utility model.
See also Fig. 1,, comprise rectification circuit 1, DC filtering circuit 2, inverter circuit 3 and output circuit 4 according to the electric ballast that the utility model provides.This electric ballast in use, alternating current (for example civil power of 50Hz) at first inputs to rectification circuit 1, by rectification circuit 1 alternating current is converted to direct current.Direct current is input to DC filtering circuit 2 and carries out Filtering Processing.Inverter circuit 3 is converted to high-frequency ac voltage with filtered direct current more afterwards, exports load to by output circuit 4.Load is generally fluorescent lamp, and it is connected by fluorescent tube, the filament that is positioned at lamp tube ends, by applying to it from the inert gas in the high-frequency ac electrical breakdown fluorescent tube of inverter, makes its conducting, thereby makes fluorescent lamp lighting.
See also Fig. 2, in the utility model, rectification circuit 1 is a bridge rectifier.DC filtering circuit 2 links to each other with rectification circuit 1, and it comprises filter capacitor C1 and filter inductance L1, and filter inductance L1 is connected in series with rectification circuit 1, and filter capacitor C1 and filter inductance L1 also connect.Because the utility model adopts direct current component filtering, so the withstand voltage of filter capacitor C1 is that 250V gets final product.
As shown in Figure 2, inverter circuit 3 comprises transformer (B1, B2, B3), the first switch element T1, second switch elements T 2, starts electric capacity and C3 and starting switch DB3.The first switch element T1 and second switch elements T 2 all have three terminals, and second end of the first switch element T1 is connected with the 3rd end of this second switch elements T 2.The end of the former limit B1 of transformer is connected with second end of the first switch element T1 and the 3rd end of second switch elements T 2, and the other end is connected with output circuit 4.The first secondary B3 of transformer is connected between first end and the 3rd end of the first switch element T1, its end of the same name is connected with the 3rd end, the second secondary B2 of transformer is connected between first end and the 3rd end of second switch elements T 2, and its end of the same name is connected with first end.
As a kind of embodiment preferred, first switch element T1 of the present utility model and second switch elements T 2 are triode, and first end of the two is a base stage, and second end is a collector electrode, and the 3rd end is an emitter.Certainly, just as well known to the skilled person, also can adopt other electronic switching element with three terminals (as thyristor, field effect transistor etc.) as the first switch element T1 and second switch elements T 2.
As shown in Figure 2, inverter circuit 3 also comprises first end that is connected to the first switch element T1 and second switch elements T 2 and two resistance R 6, the R7 between the 3rd end.In addition, inverter circuit 3 also comprises second end that is connected in second switch elements T 2 and the capacitor C 4 between the 3rd end, and be connected in first end of the first switch element T1 and the diode D8 between second end, the anode of diode D8 is connected with first end of the first switch element T1, and negative electrode is connected with second end of the first switch element T1.
This inverter circuit 3 can be converted to direct current the high-frequency alternating current that starts fluorescent lamp, and its operation principle is as follows:
After electric ballast was added some points, the electric current of the resistance R of flowing through 2, R1 was to starting capacitor C 3 chargings.After startup capacitor C 3 both end voltage were elevated to the breakover voltage value of starting switch DB3, the first switch element T1 started 3 base-emitters discharges by the first switch element T1 of capacitor C because of the forward bias conducting.In first switch element T1 conduction period, current path is: the positive source-capacitor C 6-filament-capacitor C 7-filament-choking-winding L2-primary winding B1-first switch element T1-ground.The transient change of the first switch element T1 collector current respectively produces an induced electromotive force by elementary winding B1 at two secondary winding B2 and B3 two ends, and polarity is that each winding end of the same name is for negative.The base potential of the first switch element T1 is raise, and base current and collector current further increase, and the positive feedback of interlock type makes the first switch element T1 jump to the saturation conduction state immediately.When the first switch element T1 conducting, starting capacitor C 3 will produce further trigger impulse to stop the base stage to the first switch element T1 by diode D8 and first switch element T1 discharge.
Be used to provide an outer triggering signal by starting the start-up circuit that capacitor C 3, starting switch DB3, the first switch element T1 and resistance R 4 constitute, the foundation of the higher-order of oscillation realizes by means of the generation of the coupling between three windings of saturable transformer positive feedback with keeping then.
After three winding B1, B2, B3 of transformer reach capacity, induced potential in each winding is zero, and the first switch element T1 base potential is on a declining curve, and electric current I reduces, induction electric among the former limit B1 will definitely stop electric current I to reduce, and polarity is end of the same name for just.So, the first switch element T1 base potential descends, second switch elements T 2 base potential raise, and the positive feedback of this interlock type makes the first switch element T1 withdraw from saturated rapidly and jumps to cut-off state, and second switch elements T 2 then jumps to saturation conduction by ending.When second switch elements T 2 saturation conductions, current path is: the positive source-former limit of second switch elements T 2-B1-choking-winding L2-filament-capacitor C 7-filament-capacitor C 5-ground.When each winding of transformer enter saturated after, the positive feedback of interlock type is very fast to make first switch element T1 saturation conduction once more again, and second switch elements T 2 by conducting transition for ending.So go round and begin again, the second switch elements T 2 and the first switch element T1 take turns conducting, the sense of current on the capacitor C 7 that is parallel to fluorescent tube is constantly changed, cause the LC network generation series resonance of forming by choking-winding L2 and capacitor C 7 etc. rapidly, produce a high-voltage pulse at capacitor C 7 two ends and be applied on the fluorescent tube, ignition trigger such as make.
As shown in Figure 2, output circuit 4 of the present utility model comprises first capacitor C 5, second capacitor C 6, the 3rd capacitor C 7 and choking-winding L2.One end of first electric capacity and C5 second capacitor C 6 is connected with the both positive and negative polarity of rectification circuit 1 respectively, and the other end is connected with load, and the two is used for completely cutting off to come the direct voltage of self-rectifying circuit 1.The end of choking-winding L2 is connected with the former limit B1 of transformer, and the other end is connected to the other end of load, and the 3rd capacitor C 7 is parallel to the load two ends.
The circuit of electric ballast of the present utility model is compared with the circuit of other electric ballast, adopts direct current component filtering, so the withstand voltage of filter capacitor is that 250V gets final product, and has also reduced cost when dwindling capacitor size.In addition, the utility model uses components and parts few, and the power factor (PF) height, (applicable to the fluorescent lamp of various different capacities) applied widely.
More than disclosed only be the application's a specific embodiment, but the application is not limited thereto, any those skilled in the art can think variation, all should drop in the application's the protection range.
Claims (9)
1. electric ballast, comprise and be used for alternating current is carried out rectification, to produce a galvanic rectification circuit, to be used for direct current is converted to an inverter circuit of alternating current, be used for alternating current is offered an output circuit of load, this output circuit links to each other with this inverter circuit and load respectively, it is characterized in that it comprises also and be used for a direct current filter circuit that the direct current that this rectification circuit produces is carried out filtering that this DC filtering circuit is arranged between this rectification circuit and this inverter circuit.
2. electric ballast as claimed in claim 1, it is characterized in that this DC filtering circuit comprises a filter capacitor and a filter inductance, this filter inductance is connected in series with this rectification circuit, this filter capacitor and this filter inductance also connect, and the withstand voltage of this filter capacitor is 250V.
3. electric ballast as claimed in claim 1, it is characterized in that, this inverter circuit comprises a transformer, one first switch element, one second switch element, one starts an electric capacity and a starting switch, this first switch element and this second switch element all have three terminals, second end of this first switch element is connected with the 3rd end of this second switch element, one end on the former limit of this transformer is connected with the 3rd end of second end of this first switch element and this second switch element, the other end is connected with this output circuit, first secondary of this transformer is connected between first end and the 3rd end of this first switch element, its end of the same name is connected with the 3rd end, second secondary of this transformer is connected between first end and the 3rd end of this second switch element, and its end of the same name is connected with first end.
4. electric ballast as claimed in claim 3 is characterized in that, this first switch element and this second switch element are triode, and first end of the two is a base stage, and second end is a collector electrode, and the 3rd end is an emitter.
5. as claim 3 or 4 described electric ballasts, it is characterized in that this inverter circuit also comprises first end that is connected to this first switch element and this second switch element and two resistance between the 3rd end.
6. as claim 3 or 4 described electric ballasts, it is characterized in that this inverter circuit also comprises second end that is connected in this second switch element and the electric capacity between the 3rd end.
7. as claim 3 or 4 described electric ballasts, it is characterized in that, this inverter circuit also comprises first end that is connected in this first switch element and the diode between second end, the anode of this diode is connected with first end of this first switch element, and negative electrode is connected with second end of this first switch element.
8. electric ballast as claimed in claim 1, it is characterized in that, this output circuit comprises one first electric capacity, one second electric capacity, one the 3rd electric capacity and choking-winding, one end of this first electric capacity and this second electric capacity is connected with the both positive and negative polarity of this rectification circuit respectively, the other end is connected with load, one end of this choking-winding is connected with the former limit of this transformer, and the other end is connected to the other end of load, and the 3rd electric capacity is parallel to the load two ends.
9. electric ballast as claimed in claim 1 is characterized in that, this rectification circuit is a bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200668024U CN202026517U (en) | 2011-03-15 | 2011-03-15 | Electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200668024U CN202026517U (en) | 2011-03-15 | 2011-03-15 | Electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202026517U true CN202026517U (en) | 2011-11-02 |
Family
ID=44851448
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200668024U Expired - Fee Related CN202026517U (en) | 2011-03-15 | 2011-03-15 | Electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202026517U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103796401A (en) * | 2012-10-29 | 2014-05-14 | 深圳市海洋王照明工程有限公司 | Electronic ballast and lamp |
-
2011
- 2011-03-15 CN CN2011200668024U patent/CN202026517U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103796401A (en) * | 2012-10-29 | 2014-05-14 | 深圳市海洋王照明工程有限公司 | Electronic ballast and 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: 20111102 Termination date: 20150315 |
|
| EXPY | Termination of patent right or utility model |