Q3: A push pull converter (see Fig. 16-5, lecture 16) with a centre tapped rectifier is chosen for a 12V to +/- 18V 72W automotive power supply. You are to design a transformer for this converter. Use a 1:2 turns ratio for the transformer. For the purposes of the transformer design, you can assume all other components are ideal. The full specifications are [1]: Vin = 10 to 15V dc, 13V nominal Vout = 18V dc at 2A, and -18Vdc at 2A. Frequency of operation 100kHz, operation in CCM. Transformer operating at recommended peak flux density at 100kHz of 100mT. The transformer will be based on an ETD29 core of 3090 ferrite material. d) What is the expected transformer core loss? If the copper loss is equal to the core loss, what percentage of the converter's power rating is the overall transformer loss? e) What is the minimum number of primary turns required to remain under the recommended 100kHz peak flux density? Estimate the power dissipation in the primary winding. Based on this estimate the total transformer power dissipation and compare with part a). Comment on the suitability of this transformer core for this power rating. Q3: A push pull converter (see Fig. 16-5, lecture 16) with a centre tapped rectifier is chosen for a 12V to +/- 18V 72W automotive power supply. You are to design a transformer for this converter. Use a 1:2 turns ratio for the transformer. For the purposes of the transformer design, you can assume all other components are ideal. The full specifications are [1]: Vin = 10 to 15V dc, 13V nominal Vout = 18V dc at 2A, and -18Vdc at 2A. Frequency of operation 100kHz, operation in CCM. Transformer operating at recommended peak flux density at 100kHz of 100mT. The transformer will be based on an ETD29 core of 3090 ferrite material. d) What is the expected transformer core loss? If the copper loss is equal to the core loss, what percentage of the converter's power rating is the overall transformer loss? e) What is the minimum number of primary turns required to remain under the recommended 100kHz peak flux density? Estimate the power dissipation in the primary winding. Based on this estimate the total transformer power dissipation and compare with part a). Comment on the suitability of this transformer core for this power rating