CN2405394Y - Ballast for eliminating undesirable light for fluorescent lamp - Google Patents

Abstract

The utility model discloses a ballast for eliminating undesirable light, which comprises a voltage doubling circuit, an RC branch circuit and a delay circuit, wherein, the RC branch circuit eliminates anode electron of a fluorescent lamp and undesirable light accumulation; the lamp tube does not blacken; the delay circuit solves the problem of the impact of transient lightning current voltage to the lamp tube; thereby, the service life of the lamp tube is enhanced. The utility model has the advantages of energy saving, high illumination intensity, long service life of the lamp tube, simple structure, easy fabrication and low manufacturing cost.

Description

A kind of ballast of eliminating fluorescent lamp positive electricity brightness

The utility model relates to the fluorescent lamp ballast that need are lighted with high-voltage pulse.It is applicable to fluorescent lamp, high pressure sodium lamp etc.

The ballast of prior art mainly contains three kinds, and a kind of is inductance type ballast, and it utilizes inductance moment generation high pressure to light fluorescent lamp, power consumption 30-40% when its weak point is inductance coil work, and line voltage can't start when low.Second kind is electric ballast, and it is to utilize the change electric voltage frequency to produce high pressure to light fluorescent lamp, when its weak point is ballast work, produces high frequency, causes electric pollution, and is harmful.The third is the voltage-multiplying type ballast, and it is to produce high pressure by voltage-multiplying circuit to light fluorescent lamp, and its weak point is that an end is the direct current input forever, causes the accumulation of anode positive electricity brightness, anode dark, and negative electrode is bright, and fluorescent tube is short useful life.

The purpose of this utility model is the weak point that solves above-mentioned ballast, provides a kind of energy-conservation, illumination height, long service life, the ballast of no positive electricity brightness and electron accumulation.

Circuit structure of the present utility model is by voltage-multiplying circuit, the capacitance-resistance branch road, and delay circuit constitutes; Capacitance-resistance props up electric capacity of route and a resistance constitutes, and capacitance-resistance branch road one end is connected with the fluorescent lamp anode, and an end is connected with power ground, constitutes the loop of eliminating the positive electricity brightness, thereby eliminates positive electricity brightness accumulation in the fluorescent tube; Delay circuit is made of two inductors, one with cathode fluorescent tube polyphone, another is with the fluorescent lamp anodic filament and connect, under the effect of delay circuit, no instantaneous flash current/voltage impact fluorescent tube, thereby raising fluorescent tube useful life.

Fig. 1 is an electrical block diagram of the present utility model.

The utility model is described in further detail below in conjunction with embodiment (accompanying drawing).

Shown in figure l, voltage-multiplying circuit of the present utility model is by D _1-4, C _1-4Constitute.When power supply ground end is timing, D ₁, D ₄Conducting, D ₂, D ₃End C _1-4Be recharged, go up negative down.When the power supply fire end is timing, D ₂, D ₃Conducting, D ₁, D ₄End C _1-4Discharge, charging voltage and supply voltage stack, bridge rectifier end output voltage is 4 of a supply voltage

, light fluorescent lamp RL with this high pressure.

With reference to shown in Figure 1, capacitance-resistance is propped up resistance of route, and an electric capacity constitutes, i.e. R ₃, C ₆, its end is connected with fluorescent lamp RL anode, and the other end is connected with power ground, constitutes the loop of eliminating the positive electricity brightness, the positive electricity brightness is shortened, even disappear, make light source by remaining negative glow, no longer include the accumulation of positive electricity brightness, the not blackening of fluorescent tube anode, thus improved useful life.With reference to shown in Figure 1, capacitance-resistance branch road (R ₃, C ₆) go back the discharge loop of double as inductance L 1.

With reference to shown in Figure 1, delay circuit is made of two inductance, i.e. L ₁And L ₂, inductance L ₁With the fluorescent tube anodic filament and connect inductance L ₂With tube cathode polyphone, when the voltage of voltage-multiplying circuit output through inductance L ₁The time, inductance L ₁This voltage is played delayed action.To bright arc discharge, obviously as seen the overall process of lighting fluorescent lamp RL and does not have the instantaneous flash voltage current impact to fluorescent lamp RL by gradually bright glow discharge, has really embodied and has given heat, time 〉=0.4 second.When passing through C ₁Electric current pass through inductance L ₂The time, because inductance L ₂Effect (phase shift), this electric current plays delayed action, fully gives hot filament., inductance L ₁, L ₂Current/voltage to input fluorescent lamp RL plays delayed action, makes the operating voltage of fluorescent lamp RL, and electric current is in rated value, and measured current is less than rated value (terminal voltage maintenance rated value), and the illumination height uses inductance L ₂Control stream also has and does not generate heat or effect that caloric value is little.

With reference to shown in Figure 1, capacitor C ₅For starting electric capacity, when voltage-multiplying circuit is worked, capacitor C ₅Quit work.

Advantage of the present utility model:

1, the capacitance-resistance branch road set up of the utility model has been eliminated fluorescent lamp anode undesirable light And electron accumulation, the illumination height.

2, the delay circuit set up of the utility model has been eliminated the instantaneous flash current/voltage and has been impacted fluorescent tube, thereby has improved fluorescent lamp useful life.

3, the utility model can both operate as normal at 150-250 volt, and power factor (PF) ≈ 1, and circuit structure is simple.

Claims (1)

1. a fluorescent lamp ballast of eliminating the positive electricity brightness comprises voltage-multiplying circuit, it is characterized in that also comprising the capacitance-resistance branch road, delay circuit, capacitance-resistance props up resistance of route and an electric capacity constitutes, one end is connected with the fluorescent lamp anode, and the other end is connected with power ground, and delay circuit is made of two inductance, one with cathode fluorescent tube polyphone, another and fluorescent lamp anodic filament also connect.

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