MATLAB: Extraction of Duty Ratio of a PWM in matlab

electric_motor_controlextraction of duty ratio of a pwmpower_conversion_controlpower_electronics_control

Hello,

Could anybody please help me as to how can I extract the duty ratio of a PWM wave I am getting from the simulink.

Thank you,

Best Regards Bijeta Chakraborty

Best Answer

In R2012a in the Signal Processing Toolbox, there is a new function dutycycle.

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MATLAB: How to create variable PWM in simulink

There is a built-in pwm block that varies dutycycle according to an input sine wave. See 2 and 3 level pwm generator blocks. If you need to vary dutycycle depending upon value of some signal, then the only way I can think of is by using s-functions to change the duty cycle at every step. There is a demo file in s-function demos. I have also described a simpler beginner-friendly version here: http://matlabtraining.com/blog/2013/10/how-to-write-s-functions/

MATLAB: How to convert pwm_change_duty() function used in pic uC to a pwm code

function output = pwmoutput(tctnr,q,Tcntr)
% q - pwm duty assignment 0...1
% Tcntr - pwm counter period
% tau - pwm duty
% tcntr - current pwm counter condition 0...Tcntr
tau = q*Tcntr;
output = tcntr <= tau;

Best Answer

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MATLAB: How to create variable PWM in simulink

MATLAB: How to convert pwm_change_duty() function used in pic uC to a pwm code

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