CN2405392Y - Conjugated inductance ballast for double gas discharge lamp - Google Patents

Abstract

The utility model relates to a conjugated inductance ballast for a double gas discharge lamp, composed of ballast inductors L1, L2, and a compensation capacitor C. The compensation capacitor C and the ballast inductor L1 are orderly connected in series in a power supply loop of a gas discharge lamp T1; the ballast inductor L2 is connected in series in a power supply loop of a gas discharge lamp T2; the two power supply loops are connected in parallel, wherein, the capacitive impedance value of the compensation capacitor C is equal to the sum of the inductive impedance of the ballast inductors L1, L2. If the conditions are satisfied, the inductive impedance and the capacitive impedance of the two lamp in a working line are in a conjugated relationship to cause a whole line to present capacitive performance to enhance a power factor. Meanwhile, equipment cost and use cost are reduced.

Description

The conjugation Inductive ballast that two gaseous discharge lamps are used

The utility model is a kind of conjugation-type Inductive ballast that is used for the same gaseous discharge lamp (comprising fluorescent lamp, shrunk type fluorescent lamp, high-pressure sodium lamp, metal halide lamp etc.) of two power.

In prior art, many places all can run into the situation of two gaseous discharge lamps and usefulness (hanging the street lamp of two high-pressure sodium lamps etc. as lamp stand on indoor daylight double, the highway).In this case, a lamp adopts an Inductive ballast or electric ballast respectively often.Concerning adopting Inductive ballast, in order to improve the power factor of its circuit, need at the power supply input of each lamp and meet a power factor compensation capacitance C, shown in Fig. 4,5.Like this, two lamps just need be joined two electric capacity respectively.Concerning one 250 watts high-pressure sodium lamp (as shown in Figure 5), described building-out capacitor C needs 30 μ F/450V, and the power factor of its circuit just can reach 85%.And this electric capacity is a kind of polarity free capacitor, and its price is more expensive, and increases with the increase of appearance value, approximately is that 1 μ F increases the monobasic line.Like this, concerning two high-pressure sodium lamps, just need the electric capacity of two 30 μ F/450V, only the cost of electric capacity must about 60 yuan.Both uneconomical, and power factor does not reach comparatively ideal level yet.

The utility model is the problem at above-mentioned prior art, the conjugation-type Inductive ballast that two gaseous discharge lamps that provide a kind of power factor height, can reduce cost are again used.

To achieve these goals, solution of the present utility model is as follows: it is made up of ballast inductance L1, L2 and the building-out capacitor C of gaseous discharge lamp T1, T2; After connecting successively, described building-out capacitor C and ballast inductance L1 be connected between the filament exit A1 of one of mains-supplied end A and gaseous discharge lamp T1, described ballast inductance L2 is connected between the filament exit A2 of one of mains-supplied end A and gaseous discharge lamp T2, and another filament exit B1, the B2 of described gaseous discharge lamp T1, T2 is attempted by on another mains-supplied end B; The capacitor value of described building-out capacitor C is the induction reactance sum of ballast inductance L1 and L2.

By above-mentioned solution as can be seen, in the electricity consumption loop of these two lamps, one of them loop building-out capacitor C that connected, and another loop does not have, and also the capacitive reactance of this building-out capacitor C is ballast inductance L1 and L2 induction reactance sum.If satisfy above-mentioned condition, induction reactance and capacitive reactance in these two lamp working lines are conjugate relation, that is to say that capacitive reactance and the induction reactance in the circuit is offseted substantially, and it is pure resistive that whole circuit is presented, and then power factor improves greatly.Experiment shows: the high-pressure sodium lamp with two 250 watts is tested, and the appearance value of its building-out capacitor C is also more much lower than the appearance value of a building-out capacitor of prior art, and its power factor is 97%.Therefore, compared with the prior art the utility model has improved power factor greatly, also greatly reduces equipment cost and use cost simultaneously.

Describe structure of the present utility model in detail according to embodiment below.

Fig. 1, the utility model are used for the line map of fluorescent lamp.

Fig. 2, the utility model are used for the line map of high-pressure sodium lamp.

Fig. 3, compensation box structural representation of the present utility model.

Fig. 4, existing Inductive ballast are used for the line map of fluorescent lamp.

Fig. 5, existing Inductive ballast are used for the line map of high-pressure sodium lamp.

Referring to Fig. 1, described gaseous discharge lamp adopts fluorescent lamp 1,2, and wherein T1, T2 are fluorescent tube, and S1, S2 are starter, series connection ballast inductance L1 and building-out capacitor C in the current supply circuit of fluorescent lamp 1, its ballast inductance L2 only connects in the current supply circuit of fluorescent lamp 2.And two current supply circuits are relation in parallel.According to above-mentioned annexation, the impedance in the fluorescent lamp 1 work loop is: $Z1=R1-j(\frac{1}{\mathrm{\ωC}}-\mathrm{\ωL}1),$ The impedance in fluorescent lamp 2 work loops is:

Z2＝R2+jωL2，

R1, R2 are respectively two resistance in the work loop in the formula, and ω is the angular frequency of AC power.According to the parallel connection relation in two loops, impedance total in the circuit is: $Z=\frac{Z1Z2}{Z1+Z2}$ Order:

X2=ω L2, R1 ≈ R2 ≈ R, then $Z=\frac{R^2+X1X2}{2R-j(X1-X2)}+\frac{\mathrm{jR}(X1-X2)}{2R-j(X1-X2)},$ If X1-X2=0, then $Z=\frac{R^2+X1X2}{2R}=\frac{R^2+\mathrm{\ωL}2(\frac{1}{\mathrm{\ωC}}-\mathrm{\ωL}1)}{2R},$

By the above-mentioned derivation of equation, when X1-X2=0, the total impedance Z in the circuit presents pure resistive as can be seen, and then the power factor of circuit approaches 1.In concrete the making, can satisfy X1-X2=0 fully by the value of selecting building-out capacitor C, that is:

The capacitor value of following formula explanation building-out capacitor C is the induction reactance sum of ballast inductance L1 and L2, and the angular frequency of ballast inductance L1, L2 and AC power is known in the formula, so determine capacitance according to following formula, it is pure resistive that circuit is presented.Feeder ear A and B can receive arbitrarily on the live wire and zero line of mains-supplied power supply among the figure.

Referring to Fig. 2, described gaseous discharge lamp adopts high-pressure sodium lamp 3,4, and wherein T1, T2 are the high-pressure sodium fluorescent tube, and J1, J2 are the trigger of fluorescent tube.Other connection is identical with Fig. 1.

Referring to Fig. 3, this pair gas discharge lamp ballast also can be provided with a compensation box 5, building-out capacitor C is set in this box body at least, this example is provided with trigger J1, the J2 among building-out capacitor C and Fig. 2, on this compensation box, be provided with terminal block 6, on terminal block, be provided with and the corresponding binding post of each wiring point of Fig. 2.

Claims (2)

1, a kind of pair of conjugation Inductive ballast that gaseous discharge lamp is used is characterized in that:

A, form by ballast inductance L1, L2 and the building-out capacitor C of gaseous discharge lamp T1, T2;

After connecting successively, B, described building-out capacitor C and ballast inductance L1 be connected between the filament exit A1 of one of mains-supplied end A and gaseous discharge lamp T1, described ballast inductance L2 is connected between the filament exit A2 of one of mains-supplied end A and gaseous discharge lamp T2, and another filament exit B1, the B2 of described gaseous discharge lamp T1, T2 is attempted by on another mains-supplied end B;

The capacitor value of C, described building-out capacitor C is the induction reactance sum of ballast inductance L1 and L2.

2, as claimed in claim 1 pair of conjugation Inductive ballast that gaseous discharge lamp is used is characterized in that: it has a compensation box (5), is provided with described building-out capacitor C in this compensation box at least, is provided with terminal block (6) on this capacitance compensation box.

Images