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I need to make a simulation of multiple boost converter design for different load ratios. I have designed 2 boost converter both of them have same duty cycle and same L and C values. Voltage input is 12V and with 50% duty cycle I expect to see 24V output from each of them. If I connect them in series I should get arround 48V total output, but for some reason, the top boost converter voltage is pulled down and not giving 24V. Can someone notice my mistake ot give me some tips? thank you

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    \$\begingroup\$ Fsw1 has the wrong ground reference for starters since your top boost converter is floating on top of the bottom one. \$\endgroup\$ – winny Jan 16 at 13:50
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If the source of Q1 is at 24 volts and the gate signal (Fsw1) rises from 0 volts to 12 volts then the top boost converter will never activate its MOSFET (Q1) try connecting Fsw1 between source and gate of Q1.

You might also stringly consider swapping the diodes (1N4001 types) with something that can handle switching voltages in the hundreds of kHz.

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