CN2148457Y - Electronic ballast - Google Patents

Abstract

The utility model discloses an electronic ballast, which belongs to the field of the electrotechology. The electronic ballast is characterized in that a secondary coil is arranged in a known high frequency oscillating output loop, the secondary coil is used to control a relay after being rectified, and the value of the voltage induced by the secondary coil is used to control and protect the relay, which solves the problem that the voltage output by an electronic ballast damage the electronic ballast. The utility model has the advantages of complete function, reliable performance and low cost, and can match with various daylight lamps and power saving florescent lamps.

Description

Electronic ballast

The utility model belongs to fluorescent lamp (comprising various novel energy-conserving fluorescent lamps) starting drive.Belong to electrical technology field.

Theory and practice proves, adopts high-frequency electronic ballast to start fluorescent lamp, has economize on electricity significantly, low voltage starting, fast, the no stroboscopic power factor advantages of higher of toggle speed.In order to replace traditional Inductive ballast imperative.But with regard to the popular in the market electric ballast of China; because unprotect device; in case when abnormal conditions (being difficult to startup etc. as lamp tube air leaking, aging) or the rising suddenly of electrical network electricity appear in fluorescent tube, very easily damage electric ballast, had a strong impact on the useful life of electric ballast.

The purpose of this utility model provides a kind of high-frequency electronic ballast with protective device, and it is normally luminous to start fluorescent lamp, and can the supply power voltage that abnormal conditions or electrical network electricity cut off fluorescent tube when too high automatically occur at fluorescent tube, guarantees that electric ballast is safe in utilization.

Figure of description is an electrical schematic diagram of the present utility model

The utility model has adopted known high-voltage rectifying power supply; Tandem transistor is formed the inductive feedback high-frequency generator; Oscillator loading is the LC series resonant tank.It is characterized in that on the electric device L4 of LC series resonant tank, increasing a secondary coil L5, the protecting network that a L5 two ends rectifier in parallel and relay K are formed.

Following according to Figure of description, introduce structure of the present utility model and working condition.

A kind of high-frequency electronic ballast with protective device, its circuit connection features be, the alternating current of 220V inserts bridge rectifier diode D1-D4 through lead (28), and wherein the positive pole of D1 connects the negative pole of D3, and the positive pole of D2 connects the negative pole of D4; D1 links to each other with the D2 negative pole, and connects positive pole, resistance R 1, R2, triode V1 collector electrode, capacitor C 4, the capacitor C 5 of capacitor C 1 respectively, and capacitor C 5 connects the filament of fluorescent tube; D3 links to each other with D4 is anodal, and meet normally opened contact K1-2, diode D6 positive pole, the negative pole of capacitor C 3, relay K, capacitor C 9 negative poles, the coil L5 of capacitor C 1 negative pole, resistance R 4, relay respectively, L5 connects diode D7 positive pole, the D7 negative pole meets electric R8, and R8 meets the normally opened contact K1-1 of positive pole, relay K and the K of capacitor C 9 respectively; The normally opened contact K1-1 of 1 time relay termination K of resistance R; Resistance R 2 lower ends meet the primary coil L3 of electric cloudy R3, triode V2 collector electrode, resistance R 6, diode D5 positive pole, capacitor C 2 negative poles, capacitor C 4, transformer B1 respectively, and L3 wiring circle L4 connects the filament of fluorescent tube again through L4; The emitter connecting resistance R3 of triode V1, the base stage of V1 connects negative pole, the resistance R 5 of diode D5 respectively, and R5 coils L1 connects the positive pole of capacitor C 2; The emitter connecting resistance R4 of triode V2, negative pole, resistance R 7, the R7 coils L2 that the base stage of V2 is succeeded normally opened contact K1-2, the diode D6 of electrical equipment K respectively connects the positive pole of capacitor C 3; Capacitor C 6, C7, C8 series connection, its C6 is connected with capacitor C 5 and filament respectively, and C8 is connected with coil L4 and filament respectively.

During circuit working, the 220V alternating current inserts the bridge rectifier rectification of being made up of D1-D4 through incoming line, again through C1 filtering, the direct current that produces about 330V is the oscillating circuit power supply that elements such as triode V1, V2, B1 are formed, oscillator loading is connected to the LC series resonant circuit that elements such as L3, L4, C8, C7, C6, C5 are formed, the C7 two ends produce the instantaneous high pressure of nearly 1200V during resonance, and it is normally luminous to start fluorescent tube.When fluorescent tube abnormal conditions or line voltage occur and rises to 270V, raise under the L4 two ends induced voltage calibration reason condition, this voltage is sensed secondary coil L5 two ends through transformer B2, again through the D7 halfwave rectifier, and C9 filtering, producing about 12V direct voltage is the relay K power supply, actuating of relay this moment, normally opened contact K1-2 closure is with triode V2 base stage shorted to earth, the oscillating circuit failure of oscillation is guaranteed the safety of electric ballast.In the time of the actuating of relay, the normal also closure of contact K1-1 of carrying of another group is powered the direct current of C1 two ends 300V after resistance R 1 step-down for relay, make relay be in the self-insurance operating state.Have only after the fluorescent tube fault is got rid of, relay just discharges, and starts lamp luminescence once more.

In sum; a kind of electric ballast; comprise the known high direct voltage rectification circuit that constitutes by crystal diode D1-D4 and capacitor C 1; its be one by transistor V1; the known high-frequency generator power supply that V2 constitutes; insert one by inductance coil L3 at the high-frequency generator load end; L4; capacitor L5; C6; C7; the series resonant circuit that C8 forms; capacitor C 6; the C8 two ends link with the filament at fluorescent tube two ends respectively; it is characterized in that on inductance coil L4, adding around a secondary coil L5; a rectifier of being made up of crystal diode D7 and capacitor C9 is inserted at the two ends of L5; the output of rectifier spans into a direct current relay K; one group of normally opened contact of relay K and base stage and the earth potential of transistor V2 join, and another group normally opened contact constitutes the self-keeping circuit through the control coil of resistance R 1 and high direct voltage rectification circuit output end and relay K.

Major advantage of the present utility model: electric ballast popular on the utility model and the existing market is compared, except that have economize on electricity (30-40%), low temperature, low voltage starting, no stroboscopic, noiseless, startup fast, save a large amount of advantages such as silicon steel sheet, color painting wire and copper aluminium material, also have the advantage of following five aspects:

One, abnormal condition of lamp tube state protection function.When fluorescent tube be in abnormality (as gas leakage, old and feeble, start difficulty) or line voltage when too high, defencive function can make electric ballast quit work, and cuts off the supply power voltage of fluorescent tube automatically, guarantees fluorescent tube and electric ballast safety.Come out over past ten years from electric ballast thereby solved China, itself can not protect automatically, and in a single day abnormal conditions appear in fluorescent tube, the hard nut to crack that causes electric ballast and fluorescent tube all to burn out.

Two, having the hot cathode of giving startup and cold cathode starts difunctional.When tube filament does not blow, adopt the preheating cathode Starting mode, in case filament blow, this electric ballast can change the cold cathode Starting mode automatically over to, make the fracture of wire fluorescent tube normally luminous, prolonged the useful life of fluorescent tube greatly, till the emitting material on the filament has consumed (according to investigation statistics, the various fluorescent tubes that China produces in use, because of accounting for more than 80% that the disintegration of filament is scrapped, and at this moment the emitting material on the tube filament does not exhaust, the overwhelming majority has only consumed less than 30%, so the cold cathode Starting mode can make these " fluorescent tubes of scrapping " to recover lost eyesight again, still can use for a long time).

Three, soft start function.Guarantee that fluorescent tube filament cathode before startup has enough warm-up time, thereby prevent that the electronics amount of spattering that produces when cold cathode starts from causing the lamp tube ends blackout.

Four, starting resistor wide ranges.In line voltage 100-270V scope, but the one-shot fluorescent tube is normally luminous.The present present situation of China's ubiquity power shortage, big to voltage ripple of power network wide geographic area, especially evening high lamp peak time in, solved the hard nut to crack that old-fashioned Inductive ballast is difficult for starting lamp luminescence.

Among the embodiment of the present utility model, inductance coil L4 is the coil on the ferrite magnetic post of φ 10, and the number of turns of L4 and L5 is than being 80-100:1.Relay K can be selected JZC-7F series for use with 12-24V direct current sensitive relay.Crystal diode D7 can select 1N4004 for use.

Claims (4)

1; a kind of electric ballast; comprise the known high direct voltage rectification circuit that constitutes by crystal diode D1-D4 and capacitor C 1; its be one by transistor V1; the known high-frequency generator power supply that V2 constitutes; insert one by inductance coil L3L4 at the high-frequency generator load end; capacitor L5; C6; C7; the series resonant circuit that C8 forms; capacitor C 6; the C8 two ends link with the filament at fluorescent tube two ends respectively; it is characterized in that on inductance coil L4, adding around a secondary coil L5; a rectifier of being made up of crystal diode D7 and capacitor C9 is inserted at the two ends of L5; the output of rectifier spans into a direct current relay K; one group of normally opened contact of relay K and base stage and the earth potential of transistor V2 join, and another group normally opened contact constitutes the self-keeping circuit through the control coil of resistance R 1 and high direct voltage rectification circuit output end and relay K.

2, according to the described electric ballast of claim 1, it is characterized in that inductance coil L4 is the coil on φ 10 ferrite magnetic posts, L4 is 80-100:1 with the number of turns ratio of L5.

3,, it is characterized in that relay K is a 12-24V direct current sensitive relay, can select JZC-7F series for use according to the described electric ballast of claim 1.

4,, it is characterized in that the applicable 1N4004 of crystal diode D7 according to the described electric ballast of claim 1.

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