CN201947519U - Electronic ballast for low pressure sodium lamp - Google Patents
Electronic ballast for low pressure sodium lamp Download PDFInfo
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- CN201947519U CN201947519U CN2010206792321U CN201020679232U CN201947519U CN 201947519 U CN201947519 U CN 201947519U CN 2010206792321 U CN2010206792321 U CN 2010206792321U CN 201020679232 U CN201020679232 U CN 201020679232U CN 201947519 U CN201947519 U CN 201947519U
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Abstract
The utility model relates to an electronic ballast for a low pressure sodium lamp, uses only one IR (infrared ray) 2155 integrated block and a small number of peripheral components, and comprises a rectification filter circuit, a high-side and low-side driving circuit, a switch circuit and a resonant circuit. A high frequency inverter produces high frequency alternating voltage through the resonance and inversion of the LCC (leadless chip carrier). Switch S1 and switch S2 produce square-wave voltage. A capacitor C1 connected in series blocks the direct current component of the square-wave voltage. The capacitor C1, an inductor L and a capacitor C2 form a series-parallel resonant circuit. A foot IC7 and a foot IC 5 respectively output high level pulse drive Q1 and Q2 which are conducted alternately. After the mains supply is rectified and filtered, the voltage of the direct current is divided by a resistor and then is added to the IR2155 integrated block to serve as the power supply. The electronic ballast for the low pressure sodium lamp has the advantages of having a volume obviously smaller than that of a common electronic ballast, and having low cost and stable performance.
Description
Technical field
The utility model relates to electric light and lamp fittings technical field, specifically, is a kind of low-pressure sodium lamp electric ballast.
Background technology
Low-pressure sodium lamp is a kind of as gaseous discharge lamp, in scientific research institutions, institution of higher learning and even industrial enterprise a large amount of uses is arranged.Because low pressure is received lamp low but the particularity that starting current and operating current are big of operating voltage is arranged, do not see as yet at home at present about low pressure and receive the report of electronic lamp stream device.Electric ballast uses the semi-conductor electricity sub-element, converts direct current or low-frequency ac voltage to high-frequency ac voltage, drives the electronic-controlled installation of light source works such as low-pressure gaseous discharge lamp, tungsten halogen lamp.Electric ballast is compared with traditional electromagnetic ballast has many advantages: more energy-conservation 10～15% than common electromagnetic ballast, there is not visual stroboscopic, and electromagnetic radiation disturbs little, and volume is little, but in light weight and prolonging lamp tube service life.Along with the raising of high-frequency high-power electronic component quality and reliability, the reduction of cost and the improvement of performance, the advantage of electric ballast extensively is familiar with by market, it develops into now, except common ballasts such as electronic ballast of high voltage sodium lamp, metal halide lamp electronic ballast, also have electric energy-saving ballast, HID ballast etc., but, most widely used still electronic ballast for fluoresent lamp.With regard to low-pressure sodium lamp, it is very necessary developing a kind of electric ballast that adapts with it.
Accompanying drawing 1 is the prevailing circuit of electronic ballast schematic diagram of selling in the market, and as can be seen from the figure, this type electric ballast is the auxiliary circuit complexity not only, and need have the transformer of iron core.This not only makes the volume of electric ballast big, cost is high but also very inconvenience of Installation and Debugging, also can influence the reliability of electric ballast.
The utility model content
The purpose of this utility model is, provide a kind of low pressure that is used for of making to receive the electric ballast of lamp of cheap IR2155 integrated package, this ballast is only used an integrated package and a small amount of peripheral component, and its volume is significantly less than common electric ballast, and cost is low, stable performance.
For achieving the above object, the technical scheme taked of the utility model is:
A kind of low-pressure sodium lamp electric ballast adopts the IR2155 integrated package, it is characterized in that its circuit is made of current rectifying and wave filtering circuit, high-low side drive circuit, switching circuit and resonant circuit; High-frequency inverter produces high-frequency ac voltage by the LCC resonance inversion, and switch S 1 and S2 produce square-wave voltage; The DC component of series capacitance C1 blocking-up square-wave voltage; Capacitor C 1, inductance L and capacitor C 2 form the series parallel resonance circuit; IC7 pin and IC 5 pin are exported high level pulse respectively and are driven Q1 and Q2, make Q1, Q2 alternate conduction; Direct current is through adding behind the electric resistance partial pressure on the IR2155 integrated package as power supply after the filtering of commercial power rectification.
Described resonant circuit is operated in (therefore lamp obtains very high starting voltage) near the resonance frequency before lamp is lighted; After lamp is lighted, its operating frequency be lower than resonance frequency omega 0(at this moment the voltage on the lamp be operating voltage).
Output is made up of capacitor C 1, inductance L and capacitor C 2, and C2 is in parallel with fluorescent tube.
For making the fluorescent lamp operate as normal, must satisfy three conditions: the 1. preheat curent of filament or heater current; 2. high voltage starts; 3. restraint of labour electric current.In fact an electric ballast is exactly a high-frequency ac current source, and before lamp was lighted, the lamp impedance almost was infinitely great; After lamp was lighted, electric ballast made lamp current be stabilized in design load.Consider that lamp current harmonic factor and electromagnetic radiation disturb, it is sinusoidal that desirable lamp current should be.
The good effect of a kind of low-pressure sodium lamp electric ballast of the utility model is:
Adopt the IR2155 integrated package to make low pressure and receive the electric ballast of lamp, only use an integrated package and a small amount of peripheral component; Volume is significantly less than common electric ballast, and cost is low, stable performance.
Description of drawings
Accompanying drawing 1 is the circuit theory diagrams of the prevailing electric ballast sold in the market;
Accompanying drawing 2 is the circuit diagram of a kind of low-pressure sodium lamp electric ballast of the utility model;
Accompanying drawing 3 is the circuit diagram that the LCC resonance inversion of Fig. 2 produces high-frequency ac voltage.
Embodiment
Provide the embodiment of a kind of low-pressure sodium lamp electric ballast of the utility model below in conjunction with accompanying drawing, still, enforcement of the present utility model is not limited to following execution mode.
Referring to accompanying drawing 2, the circuit diagram of a kind of low-pressure sodium lamp electric ballast of the utility model.Among the figure, the IR2155 integrated package is single chip integrated mos gate driver, has minimum quiescent current, and a 15V internal shunt adjuster is arranged.The voltage that the direct rectification of 220VAC obtains just can be its input power supply by a dropping resistor.General control integrated package needs special additional supply, becomes big thereby make it volume.Yet the user always wishes that the volume of electric ballast can be littler.Utilize the IR2155 integrated package to make electric ballast and solved this contradiction.The output of IR2155 integrated package provides flash (Highside) and low limit (Lowside) drive signal, and this drive signal just is that electric ballast is necessary.These characteristics of IR2155 integrated package have solved general electric ballast to be needed high frequency transformer that the isolation drive signal is provided, makes system bulk become problem big, that reliability reduces.In IR2155 integrated package inside, its front-end functionality is similar to popular CMOS-555, and therefore, its outside only increases RT and CT just can provide self-oscillation, and this advantage makes external control become very simple.Flash switch gate driving power is from the bootstrap capacitor of 0.1 uF, and this capacitor is charged to 14V in lower edge switch conduction period, and D1 is the fast diode that recovers, and it guarantees that bootstrap capacitor can not discharge when diode recovery and blocking-up direct voltage.In addition, IR2155 integrated package inside provides the fixed interval of one 1 us, has guaranteed that half-bridge common conducting can not occur.
The circuit of accompanying drawing 2 described a kind of low-pressure sodium lamp electric ballasts will produce the alternating voltage of high frequency with the LCC resonance inversion, and the LCC resonance inversion produces high-frequency ac voltage circuit diagram partly as shown in Figure 3: switch S 1 and S2 produce square-wave voltage; The DC component of series capacitance C1 blocking-up square-wave voltage; Capacitor C 1, inductance L and capacitor C 2 form the series parallel resonance circuit.Because the LCC network is the logical worry of a band ripple device, exports to lamp sinusoidal voltage is provided.Its input voltage is a square wave in this circuit, and its frequency is a switching frequency, and amplitude is the voltage swing after the rectification.Before lamp was lighted, resonant circuit was operated near the resonance frequency, and therefore lamp obtains very high starting voltage.After lamp was lighted, the resonant circuit operating frequency was lower than resonance frequency omega 0, and at this moment voltage is operating voltage on the lamp.The 310V direct current adds on the IC1 pin through R1 after the filtering of commercial power rectification, is the IC power supply.1 pin and the diode D1 between 8 pin of IC are bootstrap diode, to being connected capacitor C 3 chargings between 6 pin and 8 pin, make 8 pin voltage U b=VS+VCC, are the high-end out drive stage circuit supply in the IC.The frequency of oscillation of R1 and C4 decision IC internal oscillator.IC7 pin and 5 pin are exported high level pulse respectively and are driven S1 and S2, make S1, S2 alternate conduction.The series resonant circuit of forming by L and C1, C2, make lamp tube ends produce high pressure, make in the fluorescent tube gas produce glow discharge and light fluorescent tube.After lamp is lighted, the LC off resonance, lamp tube ends is added with normal working voltage, and at this moment, L is a current limiting element.
Selection of components and installation: after the IC operate as normal, 1 pin voltage is vised at 15.6V, source current ICC=5mA.C1 gets 47uF/16V electrolytic capacitor: D1 and gets the 1A/400V fast recovery diode, as UF4007,11DF4 etc.; S1, S2 get SSP2N60 or IRF72 power MOSFET, and L is 2～2.5mH, and coil turn is decided on used magnetic core.C2 can be with the metal polypropylene capacitor of 2200～4700pF/630V.During debugging, if the lamp current offrating, the inductance value of scalable L is solved.For anti-surge impacts, should add switch during debugging.S1, S2 mid point output pulse high level duty ratio are 50%.
Claims (3)
1. a low-pressure sodium lamp electric ballast adopts the IR2155 integrated package, it is characterized in that its circuit is made of current rectifying and wave filtering circuit, high-low side drive circuit, switching circuit and resonant circuit; High-frequency inverter produces high-frequency ac voltage by the LCC resonance inversion, and switch S 1 and S2 produce square-wave voltage; The DC component of series capacitance C1 blocking-up square-wave voltage; Capacitor C 1, inductance L and capacitor C 2 form the series parallel resonance circuit; IC7 pin and IC 5 pin are exported high level pulse respectively and are driven Q1 and Q2, make Q1, Q2 alternate conduction; Direct current is through adding behind the electric resistance partial pressure on the IR2155 integrated package as power supply after the filtering of commercial power rectification.
2. a kind of low-pressure sodium lamp electric ballast according to claim 1 is characterized in that described resonant circuit is operated near the resonance frequency before lamp is lighted; After lamp was lighted, its operating frequency was lower than resonance frequency omega 0.
3. a kind of low-pressure sodium lamp electric ballast according to claim 1 is characterized in that output is made up of capacitor C 1, inductance L and capacitor C 2, and C2 is in parallel with fluorescent tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206792321U CN201947519U (en) | 2010-12-24 | 2010-12-24 | Electronic ballast for low pressure sodium lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206792321U CN201947519U (en) | 2010-12-24 | 2010-12-24 | Electronic ballast for low pressure sodium lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201947519U true CN201947519U (en) | 2011-08-24 |
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ID=44474853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206792321U Expired - Fee Related CN201947519U (en) | 2010-12-24 | 2010-12-24 | Electronic ballast for low pressure sodium lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201947519U (en) |
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2010
- 2010-12-24 CN CN2010206792321U patent/CN201947519U/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: 20110824 Termination date: 20131224 |