CN2469654Y - Electronic ballast for multiple fluorescent tubes simultaneous lighting - Google Patents

Abstract

The utility model discloses an electronic ballast which can make a plurality of lighting tubes start simultaneously, and includes a power source wave filtering commute circuit, a driving contravariance circuit which produces a driving signal thick membrane circuit and a protective circuit. The utility model is characterized in that a plurality of lighting tube loops which contain wave filtering thick membrane circuits, feedback commute wave filtering voltage-stabilization circuits which are commonly used by a plurality of light tube circuits and wave filtering circuits of every input end of light tubes are also arranged. The utility model has the advantages that a plurality of lighting tubes can be lighted simultaneously. The utility model has simple structure, high performance and reliability and convenient use, thus being suitable for homes and sites where need to start a plurality of lighting tubes simultaneously and providing plentiful light source for the people.

Description

Many fluorescent tubes simultaneous lighting electric ballast

The utility model relates to a kind of ballast that opens bright fluorescent tube, especially can open the electric ballast of bright many fluorescent tubes simultaneously.

At present, fluorescent tube is the most frequently used electric lighting light sources of people, and the electric ballast great majority that are used to open bright fluorescent tube are that a ballast opens a bright tubes, if many tubes will be installed, then need join a plurality of corresponding ballasts, cause complex circuit, difficulty and cost height are installed.Certainly, also there is the electric ballast of only a few can open bright many tubes simultaneously, still, its complex structure, reliability is bad, and the price height is difficult to enter common people family.

The purpose of this utility model provides a kind of simple in structure, good reliability, easy for installation and many fluorescent tubes simultaneous lighting electric ballast that price is low.

The utility model comprises power supply rectification filter circuit, contains the driving inverter circuit and the protective circuit that produce the drive signal thick film circuit; also comprise by driving inverter circuit promoting, contain many fluorescent tube loops and the reaction type rectification filtering voltage stabilizing circuit of each tube circuit and the filter circuit of each fluorescent tube input of filtering thick film circuit.

Many fluorescent tubes simultaneous lighting electric ballast of said structure in driving inverter circuit and each fluorescent tube loop, has adopted the thick film circuit that produces drive signal and filtering, makes entire circuit tubeization greatly; One drives inverter circuit and promotes many tubes and open brightly, and cost greatly descends, and has made things convenient for installation.Also adopt filter circuit and the reaction type rectification filtering voltage stabilizing circuit of protective circuit, each fluorescent tube input, improved the Performance And Reliability of ballast.Every index all reaches GB15143-94, the requirement of GB/T15144-94 GB.Each family installs one or two this ballast and gets final product.Particularly public place such as large supermarket, hospital is particularly suitable.

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Shown in Figure 1, be the electrical schematic diagram of the utility model electric ballast.

In Fig. 1, the mains supply input circuit is by fuse F ₁, piezo-resistance YM, inductance L ₁And capacitor C ₁, C ₂Constitute overcurrent protection and LC type filter circuit.By rectifier diode D ₁～D ₄Constitute fluorescent tube P ₁Full-wave rectifying circuit, for fluorescent tube P ₁The DC power supply of circuit, wherein, diode D ₁And D ₂Anode and connect the end E be public negative pole, diode D ₃And D ₄Negative electrode and connect end for anodal.Produce the thick film circuit MC828 and the field effect transistor M of drive signal ₁And M ₂, transformer T ₁, resistance R ₄～R ₈And capacitor C ₄, C ₆Constitute and drive inverter circuit.Wherein, producing drive signal thick film circuit MC828 is this enterprise product model, and the last patent application in this enterprise: independent-excited electric ballast, application number are 00229166.5, and the applying date is existing introduction the on 01 25th, 2000; Inverter circuit is a typical circuit of the prior art.The pin 1 of thick film circuit MC828 meets power cathode E end, pin 2 connecting resistance R ₉, R ₁₀And capacitor C ₉Interface point, pin 3 meets transformer T ₁Elementary, pin 4 passes through resistance R ₆Meet field effect transistor M ₂Grid, pin 5 connecting resistance R ₁₁, voltage stabilizing didoe D ₇And capacitor C ₅Interface point.Field effect transistor M ₁Drain electrode connect pin 4, the capacitor C of filtering thick film circuit MC211 ₄Positive pole and resistance R ₈The interface point K of one end, source electrode connects inductance L ₂～L ₄, resistance R ₄One end, transformer T ₁A secondary end and field effect transistor M ₂The interface point M of drain electrode.Capacitor C ₄And resistance R ₈Another termination power cathode E end.Field effect transistor M ₂Source electrode connect power cathode E end.At fluorescent tube P ₁In the loop, thermistor PTC ₁And capacitor C ₁₂And two ends respectively meet fluorescent tube P after connecing ₁Pin 2,3; Capacitor C ₁₁With transformer T ₂Elementary and connect the back two ends respectively meet lamp P ₁Pin 1,4.Fluorescent tube P ₁Pin 1 also connect the pin 2 of filtering thick film circuit MC211, pin 4 also connects inductance L ₂One end and capacitor C ₃Interface point F.Capacitor C ₃Another termination capacitor C ₁₄, C ₁₅An end and AC power input point A.Capacitor C ₁₄, C ₁₅The other end meet fluorescent tube P respectively ₂, P ₃Pin 4 and inductance L ₄, L ₃Interface point G, H.Filtering thick film circuit MC211 is the product type of this enterprise, and the effect of this thick film is that Voltage pulsating direct-current supply is imported from pin 1,3, at the voltage of the steady waveform of pin 2,4 outputs, helps reducing the crest factor of lamp current, improves performance.The pin 3 of thick film MC211 meets diode D ₃And D ₄Negative pole, pin 1 connects power cathode E end.The reaction type rectification filtering power is by transformer T ₂, diode D ₈, and the shared resistance R of each fluorescent tube ₁₁, capacitor C ₅And C ₇, voltage stabilizing didoe D ₇Constitute, this feedback power supply is fluorescent tube P ₁Qi Lianghou is from fluorescent tube P ₁Pin 1 and 4, transformer T ₂, to diode D ₈, resistance R ₁₁To thick film MC828 pin 5, supply thick film MC828 working power.Resistance R ₂With thermistor R ₃After the serial connection, a termination rectifier diode D ₃And D ₄Negative pole, another terminating diode D ₈, D ₁₄, D ₁₅Negative pole, capacitor C ₇One end and resistance R ₁₁Interface point Y.Resistance R ₁₁Another termination voltage stabilizing didoe D ₇Negative pole, capacitor C ₅Positive pole and thick film MC828 pin 5.Voltage stabilizing didoe D ₇And capacitor C ₅Another termination power cathode E end.The startup power supply of thick film MC828 is from rectifier diode D ₃And D ₄Negative pole, through resistance R ₂, R ₃, R ₁₁Pin 5 to this thick film.Protective circuit is by transformer T ₂, diode D ₉, and the shared resistance R of each fluorescent tube ₁, R ₉, R ₁₀, capacitor C ₉And C ₁₀Constitute.Wherein, transformer T ₂Secondary centre tap meets power cathode E end, the diode D of a termination reaction type power supply ₈Positive pole, the diode D of another termination protective circuit ₉Positive pole, diode D ₉Negative pole, resistance R ₉And capacitor C ₁₀Interface point P also meet fluorescent tube P ₂, P ₃The diode D of circuit ₁₂, D ₁₃Negative pole; Resistance R ₉The other end and resistance R ₁₀, capacitor C ₉The pin 2 of the F utmost point and thick film circuit MC828 is connected.Thermistor R ₁With resistance R ₁₀Other end serial connection back another termination power cathode E.Capacitor C ₉And C ₁₀Another termination power cathode E.No matter any tubes P ₁～P ₃Abnormality appears, with each lamp pin 1 and 4 and the transformer T that connects ₂Or T ₃Or T ₄Secondaryly will produce the higher voltage value, by diode D ₉Or D ₁₃Or D ₁₂The voltage of a P is raise, make this thick film circuit failure of oscillation through the pin 2 of thick film circuit MC828, no drive signal is in pin 3,4 outputs, the inverter circuit no-output, and the then circuit also self-locking that quits work, thus play the effect of protection.As can be known from Fig. 1, at fluorescent tube P ₂Circuit in, by thermistor PTC ₂, capacitor C ₈, C ₁₆, inductance L ₄Fluorescent tube P with filtering thick film circuit MC211 formation ₂The loop; By diode D ₁, D ₂, D ₅, D ₆The power rectifier circuit that constitutes; By comprising diode D ₁₄, transformer T ₃Reaction type filtering voltage regulation power circuit with the common circuit formation; By comprising diode D ₁₃, transformer T ₃Protective circuit with the common circuit formation; By comprising electric C ₁₄The filter circuit that constitutes is all with fluorescent tube P ₁Circuit identical.In like manner, at fluorescent tube P ₃Circuit in, by diode D ₁, D ₂, D ₁₀, D ₁₁The power rectifier circuit that constitutes; By filtering thick film MC211, resistance PTC ₃, capacitor C ₁₃, C ₁₇And inductance L ₃The fluorescent tube P that constitutes ₃The loop; By comprising diode D ₁₅, transformer T ₄Reaction type filtering voltage regulation power circuit with the common circuit formation; By comprising diode D ₁₂, transformer T ₄Protective circuit with the common circuit formation; By comprising capacitor C ₁₅The filter circuit that constitutes also with fluorescent tube P ₁Circuit structure identical.So no longer narration.Only represented that in Fig. 13 tubes open bright circuit diagram simultaneously, also can increase light pipe quantity in actual applications, as long as increase corresponding fluorescent tube feeder number.

The operation principle of this many fluorescent tubes simultaneous lighting electric ballast is: the alternating current 220V power supply is from inductance L ₁Place's input is through rectifier diode D ₁～D ₆And D ₁₀, D ₁₁Obtain the direct voltage in each fluorescent tube loop behind the bridge rectifier that constitutes again through filtering thick film circuit MC211 filtering, field effect transistor switch pipe M ₁, M ₂Control lower whorl conductance at thick film circuit MC828 is logical.In a work period, during positive half wave, switching tube M ₁Conducting, switching tube M ₁, inductance L ₂, fluorescent tube P ₁, thick film circuit MC211 and DC power supply form the loop; When bearing half-wave, M ₂Conducting, switching tube M ₂, inductance L ₂, fluorescent tube P ₁, thick film circuit MC211 and DC power supply form the loop, therefore at fluorescent tube P ₁In just passed through high-frequency ac current, make fluorescent tube P ₁Light.Fluorescent tube P ₂, P ₃Principle of lighting and fluorescent tube P ₁Identical.Capacitor C ₃, C ₁₄, C ₁₅Effect mainly be to play to suppress high order harmonic component and improve power factor.Because the power supply and the filter circuit of each fluorescent tube are relatively independent, therefore, parameter adjustment is convenient, and high conformity also is provided with protective circuit in each tube circuit, machine performance index height.

Claims (2)

1, a kind of many fluorescent tubes simultaneous lighting electric ballast, comprise power supply rectification filter circuit, contain the driving inverter circuit and the protective circuit that produce the drive signal thick film circuit, it is characterized in that: also comprise by driving inverter circuit promoting, many fluorescent tube loops that contain the filtering thick film circuit, the filter circuit of each fluorescent tube input; Wherein: (a) offer the positive pole of the DC power supply of every tubes circuit working, respectively by the diode (D of each fluorescent tube rectification circuit ₃, D ₄And D ₅, D ₆And D ₁₀, D ₁₁) negative pole and connecing obtain, negative pole is then by common rectifier diode (D ₁, D ₂) anodal and connect and obtain; (b) output pin (4) of the filtering thick film circuit of each tube circuit is all with field effect transistor (M ₁) drain electrode and electric capacity (C ₄) anodal tie point (K) connect, the output pin of this thick film circuit (2) is connected with each self-corresponding tube circuit.

2, many fluorescent tubes simultaneous lighting electric ballast according to claim 1 is characterized in that: each lamp pin (4) and each inductance (L ₂, L ₃, L ₄) interface point all be connected with an electric capacity (C respectively ₃, C ₁₄, C ₁₅), the other end of these electric capacity all is connected with the zero line or the phase line of input power supply, constitutes the filter circuit of each fluorescent tube input.

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