(b) Explain why a power transformer is ideally designed so that the flux density in the magnetic material is below saturation. A 50 Hz sinusoidal AC voltage source of peak value V, = 340 V delivers power to a resistive load of 50 n. (c) (1) Calculate the average power delivered. (ii) The AC source is now connected to the load via a full wave diode bridge. The turn-on voltage of the diodes is 0.3 V. Calculate the peak voltage across the load and the average voltage across the load. (ii) Explain how a smoothing capacitor can be used to hold up the voltage across the load. Compare the efficiency of the rectifier with and without the smoothing capacitor. (iv) Define "regulation" as applied to the output voltage of a rectifier and explain why an LR filtered rectifier bridge provides better regulation of the load voltage than an RC filtered rectifier bridge.
(b) Explain why a power transformer is ideally designed so that the flux density in the magnetic material is below saturation. A 50 Hz sinusoidal AC voltage source of peak value V, = 340 V delivers power to a resistive load of 50 n. (c) (1) Calculate the average power delivered. (ii) The AC source is now connected to the load via a full wave diode bridge. The turn-on voltage of the diodes is 0.3 V. Calculate the peak voltage across the load and the average voltage across the load. (ii) Explain how a smoothing capacitor can be used to hold up the voltage across the load. Compare the efficiency of the rectifier with and without the smoothing capacitor. (iv) Define "regulation" as applied to the output voltage of a rectifier and explain why an LR filtered rectifier bridge provides better regulation of the load voltage than an RC filtered rectifier bridge.
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Transcribed Image Text:(b)
Explain why a power transformer is ideally designed so that the flux
density in the magnetic material is below saturation.
(c)
A 50 Hz sinusoidal AC voltage source of peak value V, = 340 V delivers
power to a resistive load of 50 n.
(i) Calculate the average power delivered.
(i) The AC source is now connected to the load via a full wave diode
bridge. The turn-on voltage of the diodes is 0.3 V. Calculate the peak
voltage across the load and the average voltage across the load.
(ii) Explain how a smoothing capacitor can be used to hold up the voltage
across the load. Compare the efficiency of the rectifier with and without
the smoothing capacitor.
(iv) Define "regulation" as applied to the output voltage of a rectifier and
explain why an LR filtered rectifier bridge provides better regulation of
the load voltage than an RC filtered rectifier bridge.
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