electronic ballasts may be categorized in numerous kinds in keeping with the resonator topology and inverter structures used from digital ballasts. some sorts or classifications of electronic ballasts can be defined every type as follows.

Resonant Ballast

Ballasts of this type use a resonant tank to deliver the lamp. resonant tank will clear out the harmonics at high order, so the present day thru the mild processes the sinusoid. within the layout of this very last assignment, used resonant ballast bertopologi voltage-fed.

Voltage Fed Resonant Ballast

The circuit is supplied via the DC voltage on account of the rectification of the duct voltage of the mesh line. The box-shaped voltage is received from switching the mosfet thing with a 50% obligation cycle, and is used to deliver series hooked up resonant circuits. The resonant circuit filters the upper voltage and substances the lamp with a sinusoidal voltage. numerous federal resonant ballast voltage topologies are as follows:

1/2 bgridge topology

full bridge topology

Pull pull topology

1/2 Bridge collection Resonant Inverter

The collection of series resonant half bridge inverters includes two switches, resonance inductor (Lr), resonance capacitor (Cr). The contemporary in the circuit will reach its most value while the supply frequency is equal to the resonant frequency and will lower if the source frequency is accelerated or reduced. when the frequency is lower than the resonance frequency, the inductive reactance might be smaller. because the reactance is more capacitive, the modern-day might be higher and the voltage may be smaller. If the frequency is extended, the reactance will be inductive so the modern could be smaller and the voltage will rise.

collection Resonant Inverter

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0 Voltage Switching (ZVS) on Inverter 1/2 Bridge Resonance collection

zero Voltage Switching is a transfer with a frequency above the resonance frequency (f> f0). ZVS can dispose of capacitive flip-on losses and is suitable for operation at excessive frequencies due to the fact ZVS operates at constant flip-off controls. The output voltage of the half wave inverter is half of of the VDC with the box waveform.

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The inverter generated box wave is coupled to the weight via Cl and L1 inductor to alter the modern-day thru the load (Rl). The power furnished to the load (R) within the above determine may be calculated through:

P_ {1} = frac {2V ^ {2} _ {bus} R_ {1}} { pi ^ {2} left [ left ( omega _ {s} L_ {l} – frac {1 } { omega _ {s} C_ {l}} right) ^ {2} + R ^ {2} _ {l} right]}

With ωs = 2πfs, fs is the switching frequency. in an effort to set the power can be accomplished through adjusting the amount of switching frequency. The greater the switching frequency, the output strength can be smaller and vice versa, the smaller the switching frequency, the extra the output strength.