Hi,
I am simulating this flyback converter where Vin is 48 V, Vout should be 380 V, the mutual inductance has L1 = 1e-5 H, L2 = 0.036 H, VF in the diode is 2.1 V and C = 87e-6 F. As you can see in the diagram, I tried to control it first by close-loop but as I couldn’t get the right values, I tried by fixing a constant which is 0.116564 which is the calculated duty cycle for Vin= 48 V. The problem I get is the values of V_out which is -1.428 V and I_out near 0 but negative. I tried moving the current measurement block to the bottom and the top branch, changing the connection with the secondary inductance or the polarity in the voltage measurement. I never get positive voltage and positive current with high values. According to my calculations, I_out should be 2.53 A and V_out, as I said 380 V. Could someone with knowledge in power electronics and simulink help me with this issue? It’s R2022b version.
Thanks.
CarlosHi,
I am simulating this flyback converter where Vin is 48 V, Vout should be 380 V, the mutual inductance has L1 = 1e-5 H, L2 = 0.036 H, VF in the diode is 2.1 V and C = 87e-6 F. As you can see in the diagram, I tried to control it first by close-loop but as I couldn’t get the right values, I tried by fixing a constant which is 0.116564 which is the calculated duty cycle for Vin= 48 V. The problem I get is the values of V_out which is -1.428 V and I_out near 0 but negative. I tried moving the current measurement block to the bottom and the top branch, changing the connection with the secondary inductance or the polarity in the voltage measurement. I never get positive voltage and positive current with high values. According to my calculations, I_out should be 2.53 A and V_out, as I said 380 V. Could someone with knowledge in power electronics and simulink help me with this issue? It’s R2022b version.
Thanks.
Carlos Hi,
I am simulating this flyback converter where Vin is 48 V, Vout should be 380 V, the mutual inductance has L1 = 1e-5 H, L2 = 0.036 H, VF in the diode is 2.1 V and C = 87e-6 F. As you can see in the diagram, I tried to control it first by close-loop but as I couldn’t get the right values, I tried by fixing a constant which is 0.116564 which is the calculated duty cycle for Vin= 48 V. The problem I get is the values of V_out which is -1.428 V and I_out near 0 but negative. I tried moving the current measurement block to the bottom and the top branch, changing the connection with the secondary inductance or the polarity in the voltage measurement. I never get positive voltage and positive current with high values. According to my calculations, I_out should be 2.53 A and V_out, as I said 380 V. Could someone with knowledge in power electronics and simulink help me with this issue? It’s R2022b version.
Thanks.
Carlos flyback converter, power_electronics_control, power_conversion_control, simpowersystems, simulink MATLAB Answers — New Questions

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