Fluorescent electronic ballast works: 220 volts rectified into DC , and then the next wave filter , then OTL transistor oscillator circuit composed by two high-frequency AC and DC becomes a boost , get a 300 + V AC 1000 + V peak around ,30-80KHZ frequency high voltage applied across the lamp , the light goes on . (That is, after the formation of a high-frequency AC voltage is rectified by the oscillation circuit , through step-up transformer to make the fluorescent light. )
Inductive ballast works:limiting lamp on and produce an instant high-pressure equipment should be called
magnetic ballast, he was wrapped in wire made of silicon steel core system to do so with the core of the coil in the instant power failure , it will produce high-pressure self-inductance , plus at both ends of the fluorescent tube electrode ( filament ) . This action is alternately performed , when the starter ( jump bubble ) is closed , the ballast lamp filament by limiting heat conduction ; open when the starter , the magnetic ballast will generate a high voltage in the self-inductance on both ends of the lamp filament , filament emission electron bombardment wall phosphors glow starter off repeated several times , this kind of action will be repeated several times in order to get through the lamp . When the lamp normal light , the resistance becomes smaller , starter will remain open state , so current is stabilized by the lamp, ballast work, so that the lamp normal light . Since when fluorescent ballasts work , there is always a current through the vibration prone , and may have a fever , so there ballast fluorescent , especially when poor quality ballasts will produce a very loud voice , with the a long time, but also easy to burn .
Working lamp characteristics: Lamp requires a high voltage to ignite the start , not only allows the normal current of the light emitting through , when the voltage across the lamp is lower than the supply voltage.
From the starter switch in the circuit , which consists of a neon discharge tube is made in parallel with a capacitor , the capacitor to eliminate the effect of interference on the power supply and the ballast is formed of electromagnetic oscillation circuit , the amplitude of the pulse voltage starts to increase . A discharge electrode consisting of a bimetal , a neon bulb using a discharge heating the bimetal when opening and closing , the ballast inductor current induced mutations and produce a high voltage pulse applied across the lamp .
When the lamp access circuit , from the beginning between the two electrodes Hui glow discharge , the bimetal thermal expansion pole in contact with the stationary contact , so the power supply, ballast , starter filament and form a closed loop current preheat the filament , heating time 1-3 seconds later when the glow starter two electrodes between the discharge off, followed by cooling bimetal contact with the stationary pole disconnect , disconnected moments when the two electrodes , the circuit current suddenly disappeared , then the ballast generates a high voltage pulse , after it is superimposed on the power supply , applied to the tube ends , ionized inert gas inside the tube caused by arc discharge , the normal light in the process, the town the self-inductance converter also plays a role in stabilizing the current in the circuit
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