E5.18 Find R, for maximum transfer and the maximum power transferred to R, in Fig E5.18. ANSW 27/26

A buck-boost converter operates with an input battery. It converts +12 V to –12 V at apower level of about 75 W. the switching frequency is 120 kHz. The switches have200 ns switching time. The battery has an internal series resistance of 0.2  and seriesinductance of 200 nH. (a) What is the operating value of the duty ratio? What power is lost in the battery resistance? (b) Propose an interface structure to improve operation and decrease losses. What are the duty ratio and battery         resistance loss with your interface in place?

estion 3: For the circuit given here, Write the expression for Vout in terms of the Vin, R1, R2 and R3. Vout? +8 V R₁ 1K R₂ 3.3K 1N5230B 4.7 V Zener D₁ www R3 1K +5 V For given values of Vin, the resistor values and zener diode rating, calculate value of Vout