4 i(A) ° CI 2 4 1(s) 19 6 8 10 Figure P8.9 Waveform for Problem 8.9.

Consider the circuit of Figure P8.7. Determine whether the diode is conducting. Assume VÀ = 12V, VB = 10V, and that the diode is ideal. 592 ww Determine whether the diode is conducting or not. 102 www

8.43 You have been asked to design a bridge rectifier for a power supply. A step- down transformer has already been chosen. It will supply 12 V rms to your rectifier. The bridge rectifier is shown in Figure P8.43. a. If the diodes have an offset voltage of 0.6 V, sketch the input source voltage vs (t) and the output voltage vo(t), and state which diodes are on and which are off in the appropriate cycles of v52(t). The frequency of the source is 60 Hz. Source D₁ D₂ Figure P8.43 Rectifier D₂ DA www R₂ Load v (1)

9- What is the modulating signal voltage if the maximum and the minimum voltages on the wave were observed to be 5.9v and 1.2v respectively? a) 2.35v b) 2.12v c) 1.85v d) 3.21v

Draw the Q output on the waveform

8...EDC

Please review the images.

8.* A single phase bridge rectifier supplies a IkW washing machine induction motor drive. The smoothing capacitance is 6.8 mF and the smoothing inductance is 5 mH. At full load, the equivalent resistance of the induction motor is 24 2. The ac supply is 220 V (60Hz). (a) (b) (c) Estimate the ripple What is the capacitor 'de link' voltage under full load? What is the % voltage regulation no load to full load? ?

2. What contributions are important to consider for the dissipation factor, tan 8? Please list at least 3 contributions and briefly explain why each is an important contributor.

1. For a 60Hz, 9Vms AC input, with 250 Ohms load, determine VDc across the load, for FWR power supply, (show the required circuit). Draw the waveform on the load. 2. If C=200uf, filter capacitor is applied across the load: Calculate Vpp ripple and VDc, for the load. 3. Determine PIV on the diodes 4. If one of the diodes become open, what would be VDc and V, load. across the load, with & without capacitor. Draw the waveform on the fms,