CN2151604Y - Energy-saving high-brightness fluorescent lamp ballast - Google Patents

Abstract

The utility model relates to a ballast for an energy-saving and high-brightness fluorescent lamp. A transistor is used for generating high-pulse electrical pulse. A secondary coil of a feedback transformer is connected between a base electrode and an emitting electrode of the transistor. A primary coil of the feedback transformer is electrically connected with a primary coil of a drive transformer by conducting wires, and then a serial branch circuit is formed. One end of the branch circuit is connected with a collector electrode of the transistor, and the other end is connected with the base electrode of the transistor through a resistor. A loop is formed by a secondary coil of the drive transformer and an electrode of the lamp tube, and is connected with a current limiting capacitor in series. The transistor of the utility model can respectively work in the amplification state and the on-off state according to the weight of the load, and thus the utility model can realize the purposes that the energy is saved and the fluorescent lamp sufficiently emits lights.

Description

Energy-saving high-brightness fluorescent lamp ballast

The utility model relates to fluorescent lamp ballast, and particularly a kind of its high frequency switching device can be in the energy-conservation high brightness fluorescent lamp ballast of two kinds of different operating states.

The high-frequency electric power that the HF switch action of electronic ballast for fluorescent lamp general using HF switch pipe produces makes fluorescent lamp luminous, but the above-mentioned HF switch pipe in the existing electric ballast has only a kind of single switch working state, the load of this switching tube (fluorescent lamp) changes, load is heavy during fluorescent start, load is light when normally lighting, if therefore design the driving force of switching tube by heavy duty, when normally lighting, fluorescent lamp will consume unnecessary power, if for energy-conservation and by the driving force of underload design switching tube, then the deficiency of driving force makes the fluorescent lamp can not be fully luminous when lighting, and fluorescent lamp can not fully luminously also can make lamp tube service life shorten except that influencing illumination.

The purpose of this utility model is to overcome the above-mentioned deficiency of prior art and the fluorescent lamp ballast that proposes a kind of energy-conservation high brightness, driving triode in this ballast is on off state when heavy duty, be in magnifying state during underload, improved the operating efficiency that drives triode, both satisfied power required when fluorescent tube starts, make fluorescent tube send the light of high brightness, prolong its life-span, saved electric energy again.

Fig. 1 is the electrical schematic diagram of energy-conservation high brightness fluorescent lamp ballast of the present utility model.

As shown in the figure, circuit structure of the present utility model comprises " driving triode " BG, feedback transformer, driving transformer and the components and parts such as some electric capacity and resistance. The magnetic core of transformer adopts the strip magnetic core, increases magnetic resistance. The triode feedback voltage is not directly taken from driving transformer B2 and is taken from feedback transformer B1, the primary coil of B1 and the primary coil of B2 are electrically connected, a kind of structure like this is called electrical connection external magnetic field coupled structure, and this structure makes ballast of the present utility model have above-mentioned characteristics just. Resistance R is the starting resistance of triode BG, and the secondary coil L2 series winding of capacitor C 1 and B1 is connected between the base stage and emitter stage of BG, and the BG emitter stage is to ground, and capacitor C 2 is the bypass of circuit low-frequency ac and dc energy storage electric capacity, eliminates the unsettled impact of supply voltage; Capacitor C 3 is High-frequency bypass capacitor is used for the higher-order of oscillation that bypass triode BG produces, and alleviates ballast to the interference of electric power network. RL1 and RL2 are respectively the heating electrode at fluorescent tube T two ends, and capacitor C 4 is limiting capacitors, 2 switch electrodes of K switch 2 expression starters, and K switch 1 is the power switch of circuit, the link of "+", "-" indication circuit power supply.

K switch 1 closed moment forms pulsed magnetic field at transformer B1, make the end output positive electric pulse of the same name of secondary coil L2, be added in through capacitor C 1 between the base stage and emitter of triode, under this impulse action, the collector electrode that is operated in the triode of amplification region is exported a negative electricity pulse, act on the primary coil of transformer B2, the electric current of this primary coil place branch road increases, in B1, produce high-intensity magnetic field, the L2 that makes B1 is output electric pulse once more, because the setting of transformer coil end of the same name as shown in the figure, the output voltage same-phase of transistor base input voltage and collector electrode and form positive feedback, triode is exported high frequency electric pulse continuously thus, produces strong electromagnetic field in transformer B2, and the secondary coil L2 of B2 responds to this electromagnetic field and exports the high frequency voltage that starts fluorescent lamp electrode RL1 and RL2.In the foregoing circuit course of work, not work done but be connected in same magnetic field of the L1 of B2 and the L1 of B1 through lead, therefore when the load of the L2 of B2 increases the weight of suddenly, the hurried minimizing of magnetic field intensity meeting in the B2, electric current moment of primary coil place branch road increases, and makes the secondary coil L2 of B1 can export the electric pulse of enough power, makes triode BG enter on off state by magnifying state, output current increases, and the L2 of final B2 responds to the electromagnetic field of this electric current generation and exports the power that is enough to start fluorescent tube.Just enter normal luminance behind the fluorescent tube pipeline start up by preheating, the load of the L2 of B2 at this moment reduces significantly, and the electric current of the primary coil of B1, B2 reduces simultaneously, and BG is returned to magnifying state, and ballast is being done the underload operation, has realized the energy-conservation purpose of high brightness luminescent.

Claims (1)

1, a kind of energy-conservation high brightness fluorescent lamp ballast, mainly comprise the driving triode, feedback transformer, driving transformer and some electric capacity, elements such as resistance, it is characterized in that being connected with between the base stage of triode and the emitter secondary coil of feedback transformer, the primary coil of feedback transformer and the primary coil of driving transformer with lead be electrically connected to form one the series connection branch road, the collector electrode of one termination triode of this branch road, the other end connects the base stage of triode behind a resistance, be connected in series a limiting capacitor in the loop that driving transformer secondary coil and lamp tube electrode constitute.

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