CN2632986Y - Electronic ballast - Google Patents
Electronic ballast Download PDFInfo
- Publication number
- CN2632986Y CN2632986Y CN 03231903 CN03231903U CN2632986Y CN 2632986 Y CN2632986 Y CN 2632986Y CN 03231903 CN03231903 CN 03231903 CN 03231903 U CN03231903 U CN 03231903U CN 2632986 Y CN2632986 Y CN 2632986Y
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- China
- Prior art keywords
- circuit
- inverter
- electric ballast
- rectifier
- ballast
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an electric ballast, which aims at eliminating high frequency(HF) electromagnetic pollution. The electric ballast consists of an AC rectifying circuit, a current inverter, and the bus. The current inverter and the bus are connected by the commute circuit. In terms of the advantages, the direct electricity supply illuminates load, and thus causes no high frequency pollution. Further, the flash is prevented, and thus, not only the eyes of the customers are protected, but also the environment is free from being polluted.
Description
Technical field
The utility model relates to a kind of electric ballast, particularly relates to a kind of electric ballast that can eliminate the high frequency pollution that is used for fluorescent lamp.
Background technology
The existing electric ballast that is used to not have the stroboscopic power saving fluorescent lamp, after all adopting AC rectification filtering, connect starting circuit behind the dc-to-ac inverter, as Chinese patent 87217123 disclosed a kind of electronic ballast for fluorescent lamp, it is by the current rectifying and wave filtering circuit of bridge rectifier or voltage multiplying rectifier, the bridge power switching circuit of series resonance and starter current-limiting circuit are formed, its bridge power switching circuit is to be the output arm of SEPP single ended push-pull by two same polarity NPN type triodes, the voltage divider of supply two each point voltage of pipe of two electric capacity of other two arms and the other electric capacity of band and feedback transformer are formed, and its starter restricted portion is made up of the series resonant circuit of LC and partiting dc capacitor.Existing these electric ballasts all be with interchange convert to become high frequency again behind the direct current after supply load luminous, the stroboscopic when avoiding low frequency.Though these electric ballasts can be eliminated the stroboscopic shortcoming that low frequency brings, all exist high-frequency electromagnetic simultaneously and pollute, therefore, along with the attention of countries in the world to environment, the enforcement of China's " green illumination " engineering, its use are subjected to more and more stricter restriction.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of can eliminate the electric ballast that high-frequency electromagnetic pollutes at above-mentioned prior art present situation.
The utility model solves the problems of the technologies described above the technical scheme that is adopted:
Electric ballast comprises ac rectifier, dc-to-ac inverter and starter illuminating circuit, it is characterized in that: be connected rectification circuit between described dc-to-ac inverter and illuminating circuit.
Described rectification circuit is a bridge rectifier.Commutating voltage is steady like this, the efficient height.
Before ac rectifier, also can connect the electromagnetic interference (EMI) filter, as the π type of the T type of the L type of the C type of common pure electric capacity, an inductance and an electric capacity, two inductance and an electric capacity, an inductance and two electric capacity, symmetry on the same magnetic core two inductance and the dimorphism of two electric capacity, also have various similar modified model.So both can suppress electromagnetic interference, reduce the electromagnetic interference of electric ballast self simultaneously power supply grid from power supply grid.
Ac rectifier often adopts the bridge rectifier capacitor filter.For adapting to various countries' different electrical power voltage, also can adopt the voltage multiplying rectifier filter circuit, when being 110V as supply power voltage.These circuit are circuit common, are not described in detail in this.
Dc-to-ac inverter is meant direct current is become high frequency voltage and electric current, the switching circuit of being called or high-frequency oscillating circuits are also arranged, mainly contain push-pull dc-to-ac, comprise the voltage feed push-pull dc-to-ac, current feed is recommended the formula inverter, semi-bridge type inverter and full-bridge type inverter.
For improving power factor, circuit of electronic ballast also can connect circuit of power factor correction.Power factor circuit comprises two kinds of active and passive power factor correcting circuits, can decide according to concrete circuit.
Compared with prior art, advantage of the present utility model is with the direct current supply load luminous, does not therefore have high frequency to pollute, and has eliminated stroboscopic fully, can protect people's eyes, and environmentally safe has two effects that get at one stroke again.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment.
Embodiment
Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.
As shown in Figure 1, electric ballast is made up of AC rectification filter circuit, dc-to-ac inverter, rectification circuit and starter illuminating circuit, and D1, D2, D3, D4 and electrochemical capacitor C1 have constituted rectifier filter; Resistance R 1, R2, R3, R4, R5, R6, diode D5, D6, D7, triode 01, Q2, transformer L1 (L1a, L1b, L1c), inductance L, capacitor C 3, C4, C7, C8 and bidirectional diode DB3 have constituted dc-to-ac inverter.Connect bridge rectifier D11, D12, D13, D14 and C6 behind the dc-to-ac inverter again, inductance L has also constituted the starter illuminating circuit with C9, C10 and fluorescent tube S.
The circuit basic principle of whole electric ballast is similar substantially to common electric ballast, the main distinction is: common electric ballast is directly linked to each other with starting circuit by inverter, and becoming direct current after bridge rectifier D 11, D12, D13, D14 rectification, its inverter of the utility model links to each other with the starter illuminating circuit again, use for fluorescent lamp, therefore eliminated stroboscopic and electromagnetic pollution.
Claims (5)
1, electric ballast comprises ac rectifier, dc-to-ac inverter and starter illuminating circuit, it is characterized in that: be connected rectification circuit between described dc-to-ac inverter and illuminating circuit.
2, electric ballast as claimed in claim 1 is characterized in that: described rectification circuit is a bridge rectifier.
3, electric ballast as claimed in claim 1 is characterized in that: also can connect Electromagnetic interference filter before ac rectifier.
4, electric ballast as claimed in claim 1 is characterized in that: described dc-to-ac inverter is semi-bridge type inverter or full-bridge type inverter.
5, as the described arbitrary electric ballast of claim 1-4, it is characterized in that: also connect circuit of power factor correction in the described ballast.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03231903 CN2632986Y (en) | 2003-06-06 | 2003-06-06 | Electronic ballast |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03231903 CN2632986Y (en) | 2003-06-06 | 2003-06-06 | Electronic ballast |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2632986Y true CN2632986Y (en) | 2004-08-11 |
Family
ID=34291287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03231903 Expired - Fee Related CN2632986Y (en) | 2003-06-06 | 2003-06-06 | Electronic ballast |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2632986Y (en) |
-
2003
- 2003-06-06 CN CN 03231903 patent/CN2632986Y/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 | ||
| 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 |