Question

You need to design a DC power supply that provides an average DC output voltage of 5V to charge your cellphone. The maximum allowed ripple at the output is ±200 mV. Your cellphone can be modeled as a 1 50Ω load. You have to use a bridge rectifier with four diodes. Note: For calculations, consider constant voltage drop model of the diode with V0 = 0.7V. (a) The charger is designed to use in the US, i.e. transformer primary is connected to 120Vms What 6. is the required primary-to-secondary turns ratio for the transformer? (b) What is the minimum required value of the filter capacitor? (c) Find the peak and average diode currents (d) What is the maximum reverse bias voltage across each diode?
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