Below link leads to the video that explains SEPIC converter working with the MATLAB Simulink model:
Wednesday 15 March 2017
Saturday 4 March 2017
MATLAB SIMULINK MODEL OF CLOSED LOOP SEPIC
Below link leads to the Simulink model of the closed loop SEPIC:
DOWNLOAD NOW
In this mode of operation, the duty cycle is set through feedback loop. The main advantage here is the automation being involved.
The feedback consists of a reference voltage level which is equal to the desired output level, a PI Controller, saturation, gain and a relational operator.
The output voltage obtained and the reference voltage is passed through a subtract block to obtain error voltage. This is then given to the PI Controller which produces a DC level in accordance with the error voltage. Furthermore, saturation ensures that the DC level is well within a specified range.
The above DC voltage output obtained and a Sawtooth wave is given to the relation operator. Here duty cycle of the resulting rectangular pulses is determined by the DC voltage.
DOWNLOAD NOW
In this mode of operation, the duty cycle is set through feedback loop. The main advantage here is the automation being involved.
The feedback consists of a reference voltage level which is equal to the desired output level, a PI Controller, saturation, gain and a relational operator.
The output voltage obtained and the reference voltage is passed through a subtract block to obtain error voltage. This is then given to the PI Controller which produces a DC level in accordance with the error voltage. Furthermore, saturation ensures that the DC level is well within a specified range.
The above DC voltage output obtained and a Sawtooth wave is given to the relation operator. Here duty cycle of the resulting rectangular pulses is determined by the DC voltage.
Thursday 2 March 2017
MATLAB SIMULINK MODEL OF THE OPEN LOOP SEPIC POWER CONVERTER
Below is a link provided which leads to the Simulink model of open loop SEPIC:
DOWNLOAD NOW
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
DOWNLOAD NOW
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.
Subscribe to:
Posts (Atom)