CN2346140Y - High-efficient energy-saving electronic ballast - Google Patents

Abstract

The utility model relates to a high efficient energy saving electronic ballast, which comprises a casing, a low pass filter, a rectification circuit connected with the low pass filter, and a lamp tube starting circuit connected with a lamp tube. A self-excited oscillator is connected with a rectification circuit. A self-excited oscillator circuit is composed of an isolation output transformer and the self-excited oscillator, a secondary pole of the isolation output transformer is connected with the lamp tube starting circuit, and a capacitor C3 and a capacitor C4 are arranged in the self-excited oscillator circuit and are respectively form a series loop with a primary pole L3 of the isolation output transformer. An iron core of the transformer adopts large ferrite, and high voltage can be isolated by the two capacitors. The utility model has the advantages of high safety, high reliability, interference rejection, etc.

Description

Energy-efficient electric ballast

The utility model belongs to a kind of electric ballast.

Fluorescent lamp belongs to high-intensity discharge lamp HIDL, is the energy-saving electric light source that various countries' emphasis is promoted.Implement to classify electric ballast as primary key scientific and technological projects in " Green Lighting Project " planning in China.Electric ballast has had nearly ten years history in China market since coming out the end of the eighties.Liked by the people during listing just, main cause be it possess luminous strong, energy-conservation, start characteristics such as fast.Thereby owing to give the abundant preheating of tube filament, start and easily cause fluorescent tube aging fast, product quality can not guarantee, majority think the high frequency characteristics that is subjected to quartz crystal device, Power Limitation and cause electric ballast to burn easily.Special-purpose film piece electric ballast is arranged at present, the introduction of foreign advaced technology is arranged and be provided with over-voltage over-current protection system electronic ballast.Because high-power high back voltage transistors device is improving aspect high frequency, the product quality greatly, price descends, and how to be selected for use by producer, but equally easily burns.All there is common drawback in they is that these electric ballasts are not isolated, and does not resolve anti-interference and produces subresonance for other electronic device, so they burn equally.

The purpose of this utility model provides that a kind of fail safe is good, reliability is high, jamproof energy-efficient electric ballast

The purpose of this utility model is achieved in that a kind of energy-efficient electric ballast, it comprise shell, the low pass filter that is connected with power supply, the rectification circuit that is connected with low pass filter, be connected with fluorescent tube by inductance L ₅With circuit C ₇The fluorescent tube ignition circuit of forming; Its primary structure is that it also comprises the self-excited oscillator that is connected with rectification circuit, by primary coil L ₃, secondary coil L ₄Lotus root is closed the isolating output transformer of formation, and it and self-excited oscillator constitute the self-excited oscillator circuit; Isolating output transformer secondary coil L ₄Be connected with the fluorescent tube ignition circuit; In the self-excited oscillator circuit, capacitor C is set ₃, C ₄, respectively with the elementary L of isolating output transformer ₃Constitute series loop.Isolating output transformer is big type ferrite EE28-36mm.

Because the utility model is for adopting gate associated transistor and self-control higher-order of oscillation transformer and the isolating transformer of holding concurrently.Using high permeability ferrite EE28-36mm is magnetic core of transformer, the electric ballast that the part discrete component is formed.Adopt two electric capacity to implement direct current is isolated, it prevents that effectively high direct voltage from directly inserting the fluorescent tube filament, and overcomes the power frequency electric current of surging and burn filament or other electronic device.Select for use ferrite to constitute primary L ₃Be to belong to high impedance coil.So it absorbs 98% electric energy, alleviate other electronic device worker consumption simultaneously.Because L ₃Be that the high impedance coil of wire can equivalence be considered as being connected in parallel on the silicon bridge two ends, its one of minimum reason that consumes energy that Here it is, other electric ballast can not be compared with it.In addition by L ₃L ₄Tight lotus root is closed the isolating output transformer of formation, and for fluorescent tube provides the energy, its efficient is very high, like this can be with L ₄Equivalence is treated for the high frequency small generator.So its output is pure high frequency pulse power supply, all supplies with the fluorescent lamp work energy.

Below in conjunction with drawings and Examples the utility model is further described.

Fig. 1 is circuit theory diagrams of the present utility model.

A kind of energy-efficient electric ballast, it comprise shell, the low pass filter that is connected with power supply, the rectification circuit that is connected with low pass filter, be connected with fluorescent tube by inductance L ₅With circuit C ₇The fluorescent tube ignition circuit of forming; The self-excited oscillator that is connected with rectification circuit is by primary coil L ₃, secondary coil L ₄Lotus root is closed the isolating output transformer of formation, and it and self-excited oscillator constitute the self-excited oscillator circuit; Isolating output transformer secondary coil L ₄Be connected with the fluorescent tube ignition circuit; In the self-excited oscillator circuit, capacitor C is set ₃, C ₄, respectively with the elementary L of isolating output transformer ₃Constitute series loop.Isolating output transformer is big type ferrite EE28-36mm.With two capacitor C ₃C ₄Every straight high pressure, they and respectively with primary L ₃Constitute series circuit.

Its circuit theory is as follows:

By C ₁With T ₁Constitute the power supply low pass filter, real is half-section symmetry T mode filter.Its order ground is in order to prevent high-frequency interferencing signal, and the syndrome frequency power enters, and produces BG ₁BG ₂The triode input signal mixes, and causes subresonance that device such as transistor is burnt.It stops it to enter electrical network to self-excited oscillator signal in the electric ballast simultaneously, does not disturb other electric equipment.

By D ₁-D ₄Form the silicon bridge rectifier: it is to become DC high-voltage power supply after the rectification of the electric formula frequency power of net, to provide triode BG by it ₁BG ₂Working power.

Heart-the self-excited oscillator of electric ballast.By triode BG ₁BG ₂, resistance R ₁-R ₅, capacitor C ₃-C ₆, diode D ₆D ₅, transformer L ₁-L ₄Form.It produces frequency and just depends on the triode switch time.The triode C3039 that selects for use belongs to GAT.Be 560ns its switching time, and wherein the time of depositing is 350nS.Because its switching loss of GAT series is very little, prolonged the transistor life.Its self-excited oscillator frequency is all between 20KCL to 50KCA.In addition: by L ₃L ₄Constitute isolating output transformer, mainly will net electricity and throw off fully, prevent net electric surge rush of current, prevent that simultaneously high direct voltage from directly entering fluorescent tube, cause fluorescent lamp or other electronic device are burnt with glimmering lamp.So the employing isolating output transformer is to prevent to be burnt one of effective measures method.

Fluorescent lamp tube ignition circuit: by L ₅The streamline that shakes volume and C ₇Form, at L ₄When not having out-put supply, equivalence was small electric container extremely when fluorescent tube was static state.Work as L ₄When high frequency pulse power supply output was arranged, electric current was through L ₅Fluorescent tube filament is to LC ₇, constituting the high-frequency electrical pulses resource loop by filament.This moment, fluorescent tube was luminous immediately, and in the time, electric current is crossed filament and fully given heat to it about 500mS-1500mS, and when it reached Curie's burning point, fluorescent tube started again, made fluorescent tube reach normal luminosity.Fluorescent tube is in dynamically, is considered as an equivalent large value capacitor, by it and L ₅Share high frequency pulse power supply.C ₇Automatically deactivate.

The self-excited oscillator circuit theory is as follows: when it is not switched on, and BG ₁BG ₂Two triodes are cut-off state.When power connection: A point high direct voltage is to C ₃Charge to the B point, through primary L ₃To BG ₂Collector electrode arrives R simultaneously ₅Arrive BG through it ₂Base stage forces BG ₂Become conducting by ending.Because L ₂With L ₃Be winding in the same way, this moment L ₂The negative pulse that produces forces BG ₂End by the conducting change.L ₁With L ₃Be reverse winding, so L ₁Produce positive pulse, force BG ₁Become conducting by ending.At this moment A point electric current is through BG ₁Collector electrode and emitter are to L ₃The B point is arrived through C in the back ₄To the C point, constitute the loop.This primary current flows through transformer L ₃Or electric current flows through the elementary L of pressurising device when starting working ₃Just in time be opposite.This moment L ₁Produce negative pulse and force BG ₁End by the conducting change.L ₂Produce positive pulse simultaneously and force BG ₂Become conducting by ending.They are the variation of Zhou Erfu so always, constitutes self-excited oscillator.

Through transformer L ₃Sense L ₄High frequency pulse power supply, be the required electric energy of fluorescent tube.

In sum, its energy-saving effect is as follows: old-fashioned inductance coil power consumption was with average tubes use 72W every day 4 hours.Power consumption in one day is 72W * 4 hour=288W hour.288 hours * 30 days=8640W hour of power consumption in every month.Every consumption in old-fashioned every month is 8.64 degree.

Calculate according to top similarity condition, the utility model power consumption is real to be 22W, and every day, every use was 4 hours.Power consumption in one day is 22W * 4 hour=88W hour.88 hours * 30 days=2640W hour of power consumption in every month.Every consumption in old-fashioned every month is 2.64 degree.

At same electrical equipment, use same voltage, longer by the electric current of this electrical equipment little its life-span of healing.The utility model power consumption is minimum, safe, reliable, the life-span is long.If use the 40W fluorescent tube, in the situation that luminosity equates, the power consumption of this electric ballast is minimum, all surpasses present domestic market sale electric ballast at aspect such as safe and reliable, durable in use.If select the 40W fluorescent tube equally for use, at present best is 330 milliamperes of electric currents, and real is 73W.And the utility model power consumption is that 100 milliamperes of electric currents realities are 22W.The energy-efficient electric ballast in Chaoyang, Guangdong is used the special-purpose film piece of the U.S., and its power consumption is that 150 milliamperes of realities are 33W.Wuhan Tai Ji Electronics Co., Ltd makes electric ballast, adopts the United States advanced technology, and is provided with over-current over-voltage protection, and being carved with power consumption on the label is that 200 milliamperes of realities are 44W.Old-fashioned the earliest inductance coil formula ballast power consumption is between the 330-450 milliampere, and real is 72-100W.

Claims (2)

1, a kind of energy-efficient electric ballast, it comprise the low pass filter that shell is connected with power supply, the rectification circuit that is connected with low pass filter, be connected with fluorescent tube by inductance L ₅And capacitor C ₇The fluorescent tube ignition circuit of forming; It is characterized in that it also comprises the self-excited oscillator that is connected with rectification circuit, by primary coil L ₃, secondary coil L ₄Lotus root is closed the isolating output transformer of formation, and it and self-excited oscillator constitute the self-excited oscillator circuit; Isolating output transformer secondary coil L ₄Be connected with the fluorescent tube ignition circuit; In the self-excited oscillator circuit, capacitor C is set ₃, C ₄, respectively with the elementary L of isolating output transformer ₃Constitute series loop.

2, energy-efficient electric ballast according to claim 1 is characterized in that isolating output transformer is big type ferrite EE28-36mm.