CN2057049U - Low-power compatible ballast for gas discharging lemps - Google Patents

Abstract

The utility model relates to a low-power consumption three-phase compatible ballast for a gas discharge lamp, which can be used for self-turning on a gas discharge lamp and turning on a gas discharge lamp with high voltage. The utility model uses a three-phase power supply, three-phase full-wave rectifiers which are respectively composed of diodes and are arranged on both ends of a gas discharge lamp are respectively connected by three power supplies. When the utility model is used for a loop of a gas discharge lamp with high starting voltage, a cathode preheating loop composed of three thyristors, a resistor and a voltage stabilizing pipe is additionally arranged; a lamp pipe is started by the preheating for a filament, and the impact of high-voltage starting for the lamp pipe is avoided. The utility model realizes to automatically provide reactive compensation for inductive load.

Description

Low-power compatible ballast for gas discharging lemps

The utility model relates to a kind of no power consumption three-phase capacitive ballast that is used for gaseous discharge lamp.

At present at home and abroad, people once attempted to replace the bigger inductance type gas discharge ballast of wasted work with the capacitive ballast of no power consumption, so that reach the purpose of saves energy.But used structure is improper, makes luminous mass poor, and lamp tube service life is short, effect is very bad.Human LC tandem ballast is arranged in recent years.Though reduced the part power consumption like this, cost is higher, especially need the gaseous discharge lamp of high starting voltages inapplicable to some, also need establish starter in addition, but starter is except that making complex structure, the impacting with high pressure electric current also can make lamp tube service life reduce.

The purpose of this utility model is for gaseous discharge lamp designs power consumption ballast seldom, makes the gaseous discharge lamp of high pressure starter also can start fluorescent tube without starter simultaneously.

The utility model uses three phase mains, at the two ends of gaseous discharge lamp, has one by diode D ₁And D ₂, D ₃And D ₄, D ₅And D ₆The three-phase full wave rectifier circuit of forming, wherein D ₁And D ₂Tie point energising hold C ₁With A mutually power supply join D ₃And D ₄Common point pass through capacitor C ₂With B mutually power supply join D ₅And D ₆Common point pass through capacitor C ₃With C mutually power supply join.When being used for high starter gaseous discharge lamp, set up one by controllable silicon SCR ₁, SCR ₂, SCR ₃And diode D ₇, D ₈, D ₉, the negative electrode formed of resistance W, voltage-stabiliser tube DW gives heater circuit, SCR wherein ₁, SCR ₂, SCR ₃Common port and an end of cathode filament join.SCR ₁, SCR ₂, SCR ₃The other end respectively and C ₁And D ₁, D ₂Common point, C ₂And D ₃, D ₄Common point, C ₃And D ₅, D ₆Common point join.SCR ₁, SCR ₂, SCR ₃The g utmost point gone here and there diode D respectively ₇, D ₈, D ₉, the other end of access cathode filament behind the common point series resistor W of three diodes and the voltage-stabiliser tube DW.

C in the utility model ₁, C ₂, C ₃Play metering function, its value is:

$\mathrm{Cl}=\frac{\mathrm{<figure-callout\; id="6"\; label="ID"\; filenames="892158123\_DRIMG1.png"\; state="\{\{state\}\}">ID</figure-callout>}}{6\mathrm{\&pi;Io}\sqrt{{\mathrm{Uo}}^2-(\mathrm{UD}+2\mathrm{Ud})}}$

Wherein: the ID-lamp current; The UD-light tube electric voltage; Forward voltage after the Ud-rectification; Uo is 1/3 times of current/voltage.

C ₁＝C ₂＝C ₃

Because C ₁, C ₂, C ₃Metering function, and D ₁, D ₂, D ₃, D ₄, D ₅, the three-phase full wave rectifier circuit that forms of D1 the amplitude of voltage fluctuation very little, additional again Lu ripple capacitor C ₄Almost be bordering on constant current.

When the utility model is applied in the self-starting gaseous discharge lamp, only need to add by C at the two ends of fluorescent tube ₁, C ₂, C ₃, and D ₁, D ₂, D ₃, D ₄, D ₅, D ₆, C ₄Form three-phase full wave rectifier circuit and get final product (as shown in Figure 1).

When the utility model is applied in the gaseous discharge lamp loop of high starting voltage (as shown in Figure 1), levelling silicon controlled turn-on voltage is about 300, because the fluorescent lamp 300V through giving heat can start, realize this moment filament is given heat and makes it startup, starting back lamp current riser voltage descends, when reducing to the fluorescent tube normal working voltage, not conducting of controllable silicon, after this fluorescent tube operate as normal.Thisly utilize silicon controlled conducting and not conducting to realize never being same as the method that heat makes fluorescent tube startup work of giving to tube cathode in the prior art, use the method for starter.This target gives the method for heat, has avoided the impact of high pressure to fluorescent tube, has prolonged the life-span of fluorescent tube, and controllable silicon itself is durable simultaneously, volume is little, price is low, and significantly this method is easy to promote.

Because the utility model obviously provides reactive power compensation to inductive load.Though the utility model adopts three phase mains, factory, ore deposit, street, public illumination place etc. can possess the place of three phase mains, have very significantly power savings.If so, have tangible economic benefit though promote the large-scale power savings Chang Mingxian of the utility model, quite reliable.

Fig. 1 is the gas discharge lamp circuit embodiment that the utility model is used for high starting voltage.

Fig. 2 is that the utility model is applied to the situation in the self-starting voltage discharge lamp loop.

Fig. 3 is the embodiment of the utility model when using the place that lighting quality has relatively high expectations.Choke coil L of a joint serial connection at fluorescent tube.

Claims (1)

1, gaseous discharge lamp low-power consumption three compatibility ballasts, can be used in the higher gaseous discharge lamp of self-starting gaseous discharge lamp and starting resistor, it is characterized in that: above-mentioned three-phase does not have power consumption capacitive ballast and uses three phase mains, by diode D1 and D2, D3 and D4, D5 and D6 form the two ends that three-phase full wave rectifier circuit is connected on fluorescent tube, wherein the tie point of D1 and D2 by capacitor C 1 and A mutually power supply join, D3 and D4 by C2 and B mutually power supply join, D5 and D6 by C3 and C mutually power supply join, give Re Jialu when being used for setting up a negative electrode when height starts gaseous discharge lamp, promptly by controllable silicon SCR 1, SCR2, SCR3 and diode D7, D8, D9 and voltage-stabiliser tube DW and adjustable resistance W form, SCR1 wherein, SCR2, one end of the common port of SCR3 and cathode filament joins, three controllable silicon SCR 1, SCR2, the other end of SCR3 respectively with the C1 of above-mentioned three compatibility ballasts and the common point of D1 and D2, the common point of C2 and D3 and D4, the common point of C3 and D5 and D6 joins, SCR1, SCR2, three g utmost points of SCR3 are serially connected in three diode D7 respectively, D8, D9, the other end of access tube cathode silk behind resistance W of common point serial connection of three diodes and the voltage-stabiliser tube DW.

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