Below is a link provided which leads to the Simulink model of open loop SEPIC:
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The Open loop operation requires manual adjustment of the pulse width. For example if the input voltage is 10V and output voltage is required to be 10V then the duty cycle that needs to be set to the pulse should be exactly 50%. The pulse is fed to a switch which further controls the operation of the inductors, capacitors and the diode. MOSFET switch is preferred due to the great switching speed they offer
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The Open loop operation requires manual adjustment of the pulse width. For example if the input voltage is 10V and output voltage is required to be 10V then the duty cycle that needs to be set to the pulse should be exactly 50%. The pulse is fed to a switch which further controls the operation of the inductors, capacitors and the diode. MOSFET switch is preferred due to the great switching speed they offer
- The above design can also act as boost or buck power converter depending upon the duty cycle. But, as I said duty cycle is set manually. Moreover, the efficiency offered by the open loop is low compared to closed loop due to higher ripple voltage and current.
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