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High Frequency Electronic Ballast
High frequency electronic ballast is basically switching power supply that eliminates the ohmic and iron of conventional ballast with an integrated high frequency inverter figure shown a block diagram of electronic ballast.
The electronic ballets has four sections. Since teh current from the source has a very poor power hence the power factor correction is very necessary. The first section of electronic ballast is PF correction which gives the current with approximate unity PF. The next section is rectifier which converts the AC into DC. The DC may contain the ripple hence the third section of electronic ballast is capacitor filer which the ripples and electromagnetic interference signals. The fourth section is section is high frequency inverter which converts the DC voltage into high frequency AC voltage.
Consider the circuit of Figure (a) and obtain the complete solution for the voltage v C (t) across the 5-F capacitor and the voltage v x (t) across the 5- resistor.
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