CN2253095Y - Capacitor daylight lamp electronic ballast - Google Patents

Abstract

The utility model relates to a capacitor daylight lamp electronic ballast, which is composed of a shell, a full-wave voltage doubling rectifying circuit D1, D2, C1, C2, a full-wave rectifying circuit D3, D4, C3, C4, discharge resistors R1, R2 and a current-limiting resistor. The capacitor daylight lamp electronic ballast can start in low voltage 140V, has no stroboflash, and prolongs the service life of daylight lamps. Because non rapid wear electronic elements are adopted, the self service of the capacitor daylight lamp electronic ballast is enhanced; the working time is long; the power factor reaches more than 0.9; the product cost is largely reduced. The utility model is an ideal high efficiency daylight lamp electronic ballast.

Description

The condenser type electronic ballast for fluorescent lamp

The utility model relates to a kind of condenser type electronic ballast for fluorescent lamp, belongs to the illumination electronic technology field.

At present, fluorescent lamp ballast mainly contains two kinds: the one, and traditional inductance type ballast, its advantage is that illumination is good, durable, price is low, shortcoming be low-voltage can not build-up of luminance, stroboscopic is arranged, influence the life-span of fluorescent lamp, and need add flimsy starter and building-out capacitor, need a large amount of metal materials, Heavy Weight etc.Another kind is a high-frequency electronic ballast, but its advantage be low pressure build-up of luminance, no stroboscopic, need not add starter, power savings is good, heavy and light etc., shortcoming be cost an arm and a leg, the difficult control of performance, fragile, the life-span short, High-frequency Interference is arranged and pollutes electrical network etc.

The objective of the invention is to overcome the deficiency of above-mentioned prior art, and provide a kind of can the low pressure build-up of luminance, have than the long life power factor height, the condenser type electronic ballast for fluorescent lamp that cost is low again.

The utility model comprises housing and electronic circuit, and its electronic circuit comprises one by D ₁, D ₂, C ₁, C ₂The full-wave voltage doubler of forming that fluorescent start voltage is provided; One by D ₃, D ₄, C ₃, C ₄The buck full-wave rectifying circuit of the raising lamp luminescence efficient of forming; Discharge resistance R ₁, R ₂Be used for the discharge behind the power cutoff; Current-limiting resistance is in order to overcome the flicker of fluorescent tube.

Current-limiting resistance adopts Cr20Ni80-0.18mm ², current-limiting resistance can be provided with two, is distributed on lamp tube ends.

The utility model gets final product starter for 140 volts in low pressure, no stroboscopic, prolonged the useful life of fluorescent lamp, owing to adopted the not electronics of rapid wear, the life-span of self is improved greatly, and the operating time is long, power factor (PF) reach 0.9 with more than, product cost significantly reduces, and is a kind of comparatively ideal High effective fluorescent light electric ballast.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the line map of condenser type electronic ballast for fluorescent lamp;

Embodiment:

As shown in Figure 1, full-wave voltage doubler of the present utility model provides the starting resistor of fluorescent lamp, makes daylight lamp glow starting, and circuit is made up of two halfwave rectifier, when the A point for just, the B point is when negative, V is through D ₁Give C ₁Charging, C ₁Must go up negative just down direct voltage, as V=VmSin ω t then: ${\mathrm{VC}}_1=\frac{1}{2\mathrm{\π}}{\∫}_O^{\mathrm{\π}}$ $\mathrm{Vd}\left(\mathrm{\ωt}\right)=\frac{\mathrm{Vmn}}{\mathrm{\π}}$ If V represents then V with effective value Veg _C1=0.45Veg is when diode is non-conductive, and the inverse peak voltage Vr above it is: $\mathrm{Vr}=\mathrm{Vmn}=\sqrt{2}\mathrm{Veg}=3.14V{c}_1$

When the B point for just, the A point is when negative, V is through D ₂, C ₂Charging, C ₂On just also obtain negative down direct voltage, so and C ₁On charging voltage in the same way, promptly obtain two multiplication of voltages like this between CD, this voltage is in order to be added to the fluorescent tube two ends, even the fluorescent tube build-up of luminance.

The buck full-wave rectifying circuit provides the AC power of fluorescent tube, V another logical in, in order to improving luminous efficiency, when A for just, B is when bearing, V is through D ₁, R ₃, L ₁Fz, R ₄, D ₄And C ₃∥ C ₄, D ₃, R ₃, L ₁, R ₄, K ₄And D ₂To the A point, current direction is to E, so C by down ₃∥ C ₄Circulation is for exchanging on the shunt capacitance.

The resistance of current limliting will be selected to suit, and to overcome the fluorescent tube scintillation, reduces heat simultaneously again and concentrates, and can adopt Cr ₂₀Ni ₈₀-0.18mm ²Can take to be provided with the mode of a resistance, and present embodiment recommends to be provided with two resistance wire R ₃, R ₄, be evenly distributed in lamp tube ends, can replace the shorting stub between daylight lamp holder simultaneously, R ₃, R ₄Optimum length be 1 meter.Resistance wire overcoat high-temperature insulation lacquer sleeve pipe.

Fluorescent lamp with 40W is an example, and the optimum value of each electronic component is respectively: D ₁, D ₂, D ₃, D ₄ ^{Adopt 1N4007; c} ₁, C ₂Adopt CL-400V-1.8 μ f-I; C ₃, C ₄Adopt CL-250V-3.6 μ F-I; R ₁, R ₂Adopt R4RT14-/W-1.5M Ω; R ₃, R ₄Adopt Cr ₂₀Ni ₈₀-0.18mm ²-1m.

Because the electronic component that product adopts is few, can make the product of the little heavy and light of volume, in the single closure casing of wiring board can being packed into, also wiring board can be divided into two, be respectively charged in the cavity of two lamp sockets of custom-designed lamp tube ends.

Claims (3)

1, condenser type electronic ballast for fluorescent lamp comprises housing and electronic circuit, it is characterized in that, its electronic circuit includes:

The full-wave voltage doubler of fluorescent start voltage is provided, comprises D ₁, D ₂, C ₁, C ₂

Improve the buck full-wave rectifying circuit of lamp luminescence rate, comprise D ₃, D ₄, C ₃, C ₄

Be used to overcome the current-limiting resistance of fluorescent tube flicker;

Be used for the discharge resistance R that discharges behind the power cutoff ₁, R ₂

By the described condenser type electronic ballast for fluorescent lamp of claim 1, it is characterized in that 2, current-limiting resistance adopts Cr20Ni80-0.18mm ²

3, by the described condenser type electronic ballast for fluorescent lamp of claim 1, it is characterized in that current-limiting resistance can be provided with two, is distributed on lamp tube ends.

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