CN2177325Y - High voltage sodium lamp electronic ballast - Google Patents

Abstract

The utility model relates to a high voltage sodium lamp electronic ballast, comprising an interference filtering circuit 1, a bridge-typed rectifier 2, a switch changeover circuit 3 and a vibrating driving circuit 5. The utility model is characterized in that a harmonic filtering circuit 2 and a delay protection circuit 6 are provided. The harmonic filtering circuit comprises diodes D5 to D10, a transformer T2, zener diodes Z2 to Z4, a field effect tube EFT1, an integrated block C1, a capacitance C12, a capacitance C13 and resistances R14 to R17. The delay protection circuit comprises triodes BG1 to BG3, a capacitance C5, a capacitance C6, a diode D1, a diode D2, a diode D11, a zener diodes Z1, a relay J1, and resistances R1 to R5. The utility model has the advantages of high power factor, 20% power saving, long service life and easy installation. When power supply voltage is low to 150V, the ballast can work as usual.

Description

High voltage sodium lamp electronic ballast

The utility model relates to a kind of electric ballast that adopts the electronics mode to realize high-frequency lighting.

General inductance type ballast turns to main body by enamelled wire on silicon steel sheet, adopt the electronic type trigger to trigger again, to obtain the required high pressure of lighting a lamp, owing to work in the 50Hz low frequency, thereby volume is big, weight is big, power consumption is big, power factor is low, and inconvenience is installed.

And existing electronic ballast of high voltage sodium lamp, though reduced volume, weight, for electrical network has been introduced bigger harmonic wave, thereby in fact, power factor is also low, and useful life is low, can not embody the advantage of electronic type.

The purpose of this utility model is to overcome above-mentioned shortcoming, and a kind of employing high-frequency lighting is provided, and is equipped with harmonic filtering circuit and delay protection circuit again, adds the electronic ballast of high voltage sodium lamp of hermetically sealed shell.Its efficient height, big, the economize on electricity, easy for installation of power factor.

Describe the utility model in detail below in conjunction with drawings and Examples.

Fig. 1 is the electrical principle block diagram of the utility model electronic ballast of high voltage sodium lamp.

Fig. 2 is the electronic circuit schematic diagram of Fig. 1.

Fig. 3 is the structure diagram of the utility model electronic ballast of high voltage sodium lamp.

Fig. 1 is the electrical principle block diagram of the utility model electronic ballast of high voltage sodium lamp.It is made up of interference filtering circuit 1, bridge rectifier 4, harmonic filtering circuit 2, conversion switch 3, oscillation drive circuit 5 and delay protection circuit 6.Pass through between they are at different levels to connect as shown in Figure 1.When civil power 220V alternating current after interference filtering circuit 1 filtering interfering; send into bridge rectifier 4 by the feeder line that is attached thereto; form pulsating direct current; send into the harmonic filtering circuit 2 that is attached thereto again; behind the filtering harmonic wave, send into conversion switch 3; and harmonic filtering circuit 2 provides power supply by conversion switch 3 and is controlled simultaneously; conversion switch 3 is worked under the drive current that oscillation drive circuit 5 forms again; and provide every protection by delay protection circuit 6; to guarantee under various abnormal condition; be unlikely the damage ballast, these comprise unusually:

1. lamp is aging, does not start;

2. the situation of incoming call again of cutting off the power supply in back 1 minute;

3. lamp does not connect, and ballast is switched on.

Fig. 2 is the electronic circuit schematic diagram of Fig. 1.Wherein each several part that dotted line is marked is corresponding one by one with each block diagram among Fig. 1.

Interference filtering circuit 1 is by capacitor C ₁₀, C ₁₁, C ₁₄, transformer L ₂(comprise coil L ₂₁, L ₂₂), the insurance F ₁, negative temperature thermistor NTC forms the alternating current of civil power 220V through insurance F ₁, by capacitor C ₁₄After the filtering High-frequency Interference, feed-in is attached thereto transformer L ₂, L ₂By two coil L of coiling in the same way ₂₁, L ₂₂Form, can carry out filtering to common mode disturbances, then by capacitor C ₁₀, C ₁₁The filter filtering differential mode interference of forming is delivered to the negative temperature thermistor NTC that links to each other with bridge rectifier 4 again, and the effect of NTC is to protect bridge rectifier 4 and back circuit, and the impact of the big electric current that makes it to avoid to be started shooting prolongs its useful life.The signal of telecommunication outputs to the diode D that is attached thereto through bridge rectifier 4 ₅, promptly enter harmonic filtering circuit 2, carry out power factor compensation and harmonic wave and suppress.

Harmonic filtering circuit 2 is by diode D ₅, D ₆, D ₇, D ₈, D ₉, D ₁₀, transformer T ₂, Zener diode Z ₂, Z ₃, Z ₄, field effect transistor EFT1, ic chip 1(model 555), capacitor C ₁₂, C ₁3, resistance R ₁₄, R ₁₅, R ₁₆, R ₁₇Form diode D ₅Anode is by the output and the Zener diode Z of A point and bridge rectifier 4 ₂Negative electrode links to each other, and negative electrode is by C point and late-class circuit and diode D ₆Negative electrode link to each other Z ₂Anode and R ₁₄Series connection back ground connection, tie point G therebetween is connected to 2 pin of IC1, D ₆Anode by B point and D ₇Negative electrode joins, D ₇Anode series T ₂Behind secondary 3 ends, pass through T again ₂Secondary winding ground connection, capacitor C ₁₂Termination B point, an end ground connection, T ₂1 termination A point of elementary winding, the drain electrode of 2 termination EFT1, the source ground of EFT1, grid and R ₁₅, zener Z ₃Negative electrode, R ₁₇, D ₁₀Negative electrode joins, Z ₃Anode and R ₁₅Another pin is connected to ground, D ₁₀Anode is connected to 1 pin of IC1, R ₁₇With D ₈Oppositely connect back and D ₉Anode join, be connected to T again ₁ Secondary tap 4, D ₉Negative electrode and R ₁₆Be connected to 4 pin of IC1 after the series connection, C ₁₃With Z ₄Be connected to after the parallel connection between 4 pin and ground of IC1.When the pulsating dc voltage of bridge rectifier 4 output greater than Zener diode Z ₂Puncture voltage the time, Z ₂Puncture, make ic chip 1(555) 2 pin be high level, and the power supply of IC1 is by T in the conversion switch 3 ₁Secondary 3-4 through D ₉Rectification, C ₁₃, R ₁₆Supply with after the filtering, this moment the IC1 nonoscillatory, electric current directly passes through diode D by A point ₅To the C point, offer back level conversion switch 3; When pulsating dc voltage less than Zener diode Z ₂Puncture voltage the time, Z ₂End, promptly 2 pin of IC1 are low level, IC1 vibration this moment, and its waveform is exported by 1 pin, makes field effect transistor EFT1 be in the switch oscillatory regime, thereby A point electric current passes through T ₂Export in secondary winding 3-4 after the elementary winding 1-2 transformation, through D ₇Rectification, C ₁₂Supply with late-class circuit by the B point to the C point after the filtering energy storage, thereby kept the conducting in full phase angle of A point electric current, simultaneously obtain direct voltage at the C point, so just make whole continuous input current, thereby eliminated harmonic wave, improved power factor, and because output voltage is a direct voltage, thereby back level switching circuit reliability is greatly increased.

The BG of direct current by the output of the C point of circuit 2 through being attached thereto ₄-BG ₅Collector electrode and C ₂ Offer conversion switch 3, simultaneously R through being attached thereto ₃, R ₄, J ₁Supply with delay protection circuit 6.

Conversion switch 3 belongs to prior art, and is comparatively general.In circuit, by triode BG ₄With BG ₅In parallel.Triode BG ₆With BG ₇Parallel connection is again with C ₂, C ₃Form half-bridge, vibration is by T in the oscillation drive circuit 5 ₃Finish T jointly with switching circuit ₃By three coil (T ₃₁, T ₃₂, T ₃₃) coiling forms, main polarization coil T wherein ₃₁With load (lamp) and switch BG ₄-BG ₅, BG ₆-BG ₇Mid point E join feedback coil T ₃₂, T ₃₃By current-limiting resistance R ₁₀, R ₁₁Receive switching tube BG ₄-BG ₅, BG ₆-BG ₇Base stage with the driving switch pipe, make the entire circuit operating frequency about 40KHz.

During energising, the oscillator starting of oscillation since high-pressure sodium lamp not build-up of luminance time equivalence for open circuit, so C ₄With T ₁Primary resonant is at C ₄Last resonance goes out high pressure, and when reaching the lamp keep-alive voltage, lamp starts, and after the startup, lamp is equivalent to a certain size resistance, has reduced the Q value in loop, so C ₄, T ₁No longer resonance reaches stable output.

Delay protection circuit 6 is by triode BG ₁, BG ₂, BG ₃, capacitor C ₅, C ₆, diode D ₁, D ₂, D ₁₁, Zener diode Z ₁, relay J ₁, resistance R ₁, R ₂, R ₃, R ₄, R ₅Form.D ₁Anode and T ₁Secondary 5 ends link to each other, negative electrode by with zener Z ₁After oppositely connecting, again with D ₂Anode links to each other, D ₂Negative electrode pass through R ₂With BG ₁Base stage link to each other BG ₁Collector electrode again with BG ₂Base stage link to each other BG ₂Collector electrode and BG ₃Base stage link to each other BG ₃Collector electrode pass through resistance R ₆With relay J ₁Coil link to each other and J ₁Moving contact and BG ₄-BG ₅Base-emitter-base bandgap grading link to each other, simultaneously, at J ₁Coil on diode D in parallel ₁₁, D ₁₁Negative electrode links to each other with the C point, at BG ₁Collector electrode and BG ₂Collector electrode and the C point between series resistance R respectively ₃, R ₄, at D point, C ₅With R ₁Be connected to D point and T after the parallel connection ₁Between secondary 3 ends, T ₁Secondary 3 end ground connection, C ₆Be connected between F point and ground BG ₁, BG ₂, BG ₃Base stage all and T ₁3 ends join i.e. ground connection.During work, this circuit passes through T ₁Secondary 3-5 end is obtained the ballast working signal, and just often, this voltage is through D ₁Rectification, C ₅Filtering does not reach zener Z ₁Puncture voltage, thereby BG ₁End BG ₂Conducting, BG ₃End relay J ₁Discharge the circuit operate as normal; When generation is unusual, T ₁The 3-5 terminal voltage raise, the D point voltage also raises, Z ₁Puncture, to C ₈After the charging, make BG ₁Saturated, BG ₂End BG ₃Saturated, J ₁Adhesive is because J ₁Moving contact and BG ₄-BG ₅Base-emitter-base bandgap grading link to each other, thereby impel BG ₄-BG ₅End, circuit is compelled to failure of oscillation.Behind the failure of oscillation, C ₆Pass through R ₂To BG ₁Base stage, emitter discharge make it to keep conducting, promptly keep J ₁C is worked as in adhesive ₆Voltage drops to and is not enough to keep BG ₁During conducting, BG ₁End BG ₂Conducting, BG ₃End J ₁Discharge, circuit is starting of oscillation again, if lamp also is in unusually, then repeats said process, until till the load normally, light fluorescent tube.

According to the structure diagram of the electronic ballast of high voltage sodium lamp of the utility model design as shown in Figure 3, it comprises shell 1, lid 2, ceramic insulator 3, spring clip 4 and 5, wiring board 6, hook 7, extraction electrode screw rod 8, nut 9.Shell 1 and lid 2 are stamped to form by metallic plate, 4 insulators 3 are arranged on the lid 2, be weldingly fixed on the lid by slicker solder, extraction electrode screw rod 8 is installed on the insulator, so that the user connects, the thick 1.5mm epocel of wiring board 6 usefulness plate, after corroding into circuit, welding upward again, components and parts form, resilient clip 4 and 5 adopts the machine-shaping of thick 0.8mm steel band, during assembling resilient clip is fixed on the good wiring board 6 of debugging, more this wiring board that has resilient clip is packed in the shell into cover lid, the lead-in wire of burn-oning, and shell edge burn-on with terne metal, the hook 7 of burn-oning is again sprayed stoving black varnish.

Electronic ballast of high voltage sodium lamp of the present utility model, the efficient height, power factor is big, volume is little, in light weight, compare with old-fashioned electric ballast, can economize on electricity more than 20%, and as usual work during supply voltage 150V, long service life, easy for installation.

Claims (2)

1, a kind of electronic ballast of high voltage sodium lamp comprises interference filtering circuit 1, conversion switch 3, bridge rectifier 4, oscillation drive circuit 5, it is characterized in that:

(1) be provided with harmonic filtering circuit 2 at bridge rectifier 4 and 3 of conversion switchs, this circuit is by diode D ₅, D ₈, D ₇, D ₈, D ₉, D ₁₀, transformer T ₂, Zener diode Z ₂, Z ₃, Z ₄, field effect transistor EFT1, ic chip 1, capacitor C ₁₂, C ₁₃, resistance R ₁₄, R ₁₅, R ₁₆, R ₁₇Form.Diode D ₅Anode is by the output and the Zener diode Z of A point and bridge rectifier 4 ₂Negative electrode links to each other, and negative electrode is by C point and late-class circuit and diode D ₆Negative electrode link to each other Z ₂Sun level and R ₁₄Series connection back ground connection, tie point G therebetween is connected to 2 pin of IC1, D ₆Anode by B point and D ₇Negative electrode joins, D ₇Anode series is in T ₂Behind secondary 3 ends, pass through T again ₂Secondary winding ground connection, capacitor C ₁₂Termination B point, an end ground connection, T ₂1 termination A point of elementary winding, the drain electrode of 2 termination EFT1, the source ground of EFT1, grid and zener Z ₃Negative electrode, R ₁₅, R ₁₇, D ₁₀Negative electrode joins, Z ₃Anode and R ₁₅Another pin is connected to ground, D ₁₀Anode is connected to 1 pin of IC1, R ₁₇With D ₈Oppositely connect back and D ₉Anode join, be connected to T again ₁Secondary tap 4, D ₉Negative electrode and R ₁₆Be connected to 4 pin of ICT1 after the series connection, C ₁₃With Z ₄Be connected to after the parallel connection between 4 pin and ground of IC1;

(2) be provided with delay protection circuit 6 for conversion switch 3, this circuit comprises: triode BG ₁, BG ₂, BG ₃, capacitor C ₅, C ₆, diode D ₁, D ₂, D ₁₁, Zener diode Z ₁, relay J ₁, resistance R ₁, R ₂, R ₃, R ₄, R ₅D ₁Anode and T ₁Secondary 5 ends link to each other, negative electrode by with zener Z ₁After oppositely connecting, again with D ₂Anode links to each other, D ₂Negative electrode pass through R ₂With BG ₁Base stage link to each other BG ₁Collector electrode again with BG ₂Base stage link to each other BG ₂Collector electrode and BG ₃Base stage link to each other BG ₃Collector electrode pass through resistance R ₆With relay J ₁Coil link to each other and J ₁Moving contact and BG ₄-BG ₅Base-emitter-base bandgap grading link to each other, simultaneously, at J ₁Coil on diode D in parallel ₁₁, D ₁₁Negative electrode links to each other with the C point, at BG ₁Collector electrode and BG ₂Collector electrode and the C point between series resistance R respectively ₃, R ₄, at D point, C ₅With R ₁Be connected to D point and T after the parallel connection ₁Between secondary 3 ends, T ₁Secondary 3 ends between, T ₁Secondary 3 end ground connection, C ₈Be connected between F point and ground BG ₁, BG ₂, BG ₃Base stage all and T ₁3 ends join i.e. ground connection.

2, electronic ballast of high voltage sodium lamp according to claim 1 is characterized in that: this electric ballast is fixed in the hermetic shell 1 by the resilient clip 4 and 5 that is fixed on the wiring board 6.

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