CN2119746U - Fluorescent lamp capable of continuously regulating light - Google Patents

Abstract

The utility model relates to a fluorescent lamp capable of regulating light, which is characterized in that the startup and the working circuit of the florescent lamp are directly connected with the secondary stage of a high frequency output transformer in parallel and a potentiometer is switched in the integrating circuit of a control circuit; the electric source ends of the control circuit and a high-frequency oscillation converter circuit are directly connected with the output end of a bridge rectifier circuit to make that the direct current supplies of the control circuit and the high-frequency oscillation converter circuit can be directly obtained via bridge rectifier output without passing through electrolytic capacitance filtering wave; the output voltage of the high frequency output transformer can be adjusted by adjusting the size of the potentiometer, and therefore, the brightness of the florescent lamp is adjusted. The utility model has the advantages of high reliability, simple circuit and remarkable effect of power saving.

Description

Fluorescent lamp capable of continuously regulating light

The utility model relates to a kind of fluorescent lamp, particularly a kind of fluorescent lamp.

Existing fluorescent lamp adopts inductance type iron core ballast and neon bulb starter to come operate as normal more, but it does not have dimming function, and the technology of this fluorescent lamp is more backward.Along with the fast development of electronic technology, apply electric ballast and electronic transformer in recent years gradually, the former is used on the fluorescent lamp circuit, but poor reliability, the easy scaling loss of element because the startup of its high-frequency oscillating circuits and fluorescent lamp and operating circuit link together, is not isolated; The latter then is used on the Halogen lamp LED circuit, and the load of its electronic transformer is a pure resistive loads, is used in the such capacitive reactance induction reactance load of fluorescent lamp and yet there are no report.The fluorescent lamp that people's invention tunable optical on the basis of electric ballast was also once arranged in addition, as Chinese patent 88200137.X, 88216869.2,90108950.8 etc., thereby but they all are to utilize the change inductance value to regulate to flow through the brightness that lamp tube current is regulated fluorescent tube, its complex circuit, and reliability is low, poor practicability is difficult to penetration and promotion.

The purpose of this utility model is exactly in order to solve the problem of above-mentioned existence, a kind of fluorescent lamp of continuously light-adjustable to be provided.

Technical solution of the present utility model as shown in the figure.

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

Such as Fig. 1, the utility model is to finish on the basis of electronic transformer, it includes startup and operating circuit and the fluorescent tube thereof that suppresses interfered circuit, bridge rectifier, control circuit, higher-order of oscillation converter circuit, fluorescent lamp, wherein suppresses interfered circuit by capacitor C₁、C ₂And inductance L₁、L ₂Form, bridge rectifier is by diode D₁－D ₄Form, control circuit is by resistance R₁And capacitor C₃The integrating circuit and the bilateral diode D that consist of₅, diode D₆Form, higher-order of oscillation converter circuit is by triode BG₁、BG ₂, resistance R₂－R ₅, capacitor C₄、C ₅, the elementary composition of feedback transformer T and high-frequency output transformer B, the startup of fluorescent lamp and operating circuit are by capacitor C₆、C ₇, inductance L₃Reach the series resonant tank that fluorescent tube H forms, be characterized in startup and the operating circuit C of fluorescent lamp₆、C ₇、L ₃Input directly and high-frequency output transformer B secondary and connecing. R in control circuit₁、C ₃Serial connection is advanced potentiometer W on the resistance branch of the integrating circuit that consists of, and the power end of the input of this integrating circuit and higher-order of oscillation converter circuit, that is triode BG₁Colelctor electrode and BG₂Emitter-base bandgap grading, directly and bridge rectifier D₁－D ₄Output and connect so that the dc power supply of control circuit and higher-order of oscillation converter circuit without electrochemical capacitor filtering and directly obtains from the output of bridge rectifier.

During the utility model work, the civil power power frequency supply is through suppressing interfered circuit C₁、C ₂、L ₁、L ₂After deliver to bridge rectifier D₁－D ₄Input, bridge rectifier D₁－D ₄Become direct current to offer control circuit and the higher-order of oscillation converter circuit commercial power rectification, higher-order of oscillation converter circuit is by triode BG₁、BG ₂, resistance R₂－R ₅, capacitor C₄、C ₅The zero-bias of the elementary composition of feedback transformer T and high-frequency output transformer B, separated exciting electric capacity semibridge system high-frequency converter circuit, it becomes high frequency voltage through high-frequency output transformer B output dc voltage conversion, thereby obtains fluorescent lamp startup and operating circuit C at the secondary output end of high-frequency output transformer₆、C ₇、L ₃Required power supply, when this power supply provided, the filament of fluorescent tube H at first passed through capacitor C₆Current flowing preheating (C₆Desirable higher value has effect to filament pre-heating), simultaneously by C₆、C ₇、L ₃And the series resonant tank generation resonance of fluorescent tube H composition, obtaining to catch fire crest voltage at fluorescent tube H two ends behind the resonance, fluorescent tube H lights immediately. After fluorescent tube H lights, wherein flow through big electric current, this electric current flows through startup and the operating circuit of fluorescent lamp, thereby in inductance L₃Two ends produce bigger voltage drop, thereby kept the normal operating voltage in fluorescent tube H two ends and operating current. The utility model converts civil power to high frequency electric source, export through high-frequency output transformer, as the startup of fluorescent lamp and the independent power supply of operating circuit, changed that startup and the operating circuit of fluorescent lamp is the phenomenon of a high-frequency oscillating circuits part in the conventional electronic ballast, thereby improved the reliability of circuit. The utility model is owing to adopt the circuit of electronic transformer formula to be connected with operating circuit with the fluorescent lamp startup, adopt high-frequency output transformer B isolation, triode BG in the higher-order of oscillation converter circuit that so just prevented effectively that serial-resonant from starting and the crest voltage that catches fire of operating circuit generation is added to₁、BG ₂C-E tie, make triode avoid being burned. The primary and secondary coil ratio of high-frequency output transformer B is generally 1:1, certainly also can select suitable primary and secondary turn ratio according to starting resistor and electric current, operating voltage and the electric current of fluorescent tube H. In order to make control circuit can play the effect of regulation output voltage, at bridge rectifier D₁－D ₄Output do not have can not and to connect electrochemical capacitor, by changing the resistance of potentiometer W in the control circuit, can change triode BG in the higher-order of oscillation converter circuit like this₁、BG ₂ON time and capacitor C₄、C ₅The charging amplitude, thereby can regulate easily the secondary output voltage of high-frequency output transformer B, that is fluorescent lamp starts and the supply voltage of operating circuit, the logical basic maintenance 1:1 of the power consumption of fluorescent lamp and output light, these characteristics are that fluorescent lamp is peculiar, according to formula P_Lamp＝V _Lamp×I _Lamp* cos φ transfers as can be known Save the supply voltage of fluorescent lamp startup and operating circuit, just can realize easily the continuous light tuning of fluorescent lamp. In addition, owing to do not add electrolysis electric capacity, then the dc source of higher-order of oscillation converter circuit use is lower than civil power 220V certainly, so have bigger safety coefficient, reliability improves.

The utility model applies to electronic transformer on the fluorescent lamp circuit first, the reliability of its circuit was improved greatly, have the function of continuous light tuning again concurrently, minimum brightness can transfer to about 30% of the logical value of maximum light, and Filament of fluorescent lamp all has suitable heating under different dimming state, all can start under any dimming state.The utility model not only has lights advantages such as back no stroboscopic, noiselessness, the high and low voltage of efficient also can start, and also has good service behaviour, triggers under the light level of needs, and output is stablized in the low light level time, flicker free.In addition, the utility model circuit is simple, and cost is low, and power savings is more remarkable, is convenient to penetration and promotion and uses.

Claims (3)

1, a kind of fluorescent lamp of continuously light-adjustable, it includes and suppresses interfered circuit (C ₁, C ₂, L ₁, L ₂), bridge rectifier (D ₁-D ₄), control circuit (R ₁, C ₃, D ₅, D ₆), higher-order of oscillation converter circuit (BG ₁, BG ₂, R ₂-R ₅, C ₄, C ₅, T, B), fluorescent lamp starting and operating circuit (C ₆, C ₇, L ₃) and fluorescent tube H, it is characterized in that:

The startup of a, fluorescent lamp and operating circuit C ₆, C ₇, L ₃Input directly and high-frequency output transformer B secondary and connecing;

B, the R in control circuit ₁, C ₃Serial connection is advanced potentiometer W on the resistance branch of the integrating circuit that constitutes, and the power end of the input of this integrating circuit and higher-order of oscillation converter circuit, that is triode BG ₁Collector electrode and BG ₂Emitter-base bandgap grading, directly and bridge rectifier D ₁-D ₄Output and connect, make the dc power supply of control circuit and higher-order of oscillation converter circuit without electrochemical capacitor filtering and directly obtain from the output of bridge rectifier.

2, by the fluorescent lamp of the described continuously light-adjustable of claim 1, it is characterized in that the primary and secondary coil ratio of high-frequency output transformer B is generally 1:1.

3, by the fluorescent lamp of the described continuously light-adjustable of claim 1, it is characterized in that the primary and secondary coil ratio of high-frequency output transformer B also can be selected according to starting resistor and electric current, operating voltage and the electric current of fluorescent tube H.

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