Simulink enables continuously adjustable duty cycles

Simple, use a constan module with a value of 0-1, which is the duty cycle.

Compare this value to a triangle wave, which can be generated by the repeating sequence module, with a gradient of values from 0 to 1.

The comparison is made through a relational operator module.

For example, if you set constant to and as the first input of the relational operator, and use the triangle wave as the second input of the relational operator, and the relational operator selects greater than or equal to, the relational operator will output a pulse signal of 0 and 1 after running the program.

The duty cycle is.

The simplest is to output the PWM duty cycle of the deviation signal through the PI regulator.

As shown in the figure, this is a model for the generation of a three-phase SPWM wave. The PWM waveform is formed by modulating the wave + carrier comparison to control the IGBT. The modulated wave controls the output voltage, and the carrier controls the IGBT switching frequency. For details, please refer to PWM.

pwm generator, you set it as a function.

If you look at the attachment on my post, it can generate adjustable pulses.

I built a control system, I just want to realize that the control signal is not applied all the time in each sampling cycle of the system, but only through a duty cycle calculated earlier, so that the control signal continues to affect half of the sampling period or 1 3 duty cycle. For example, the sampling period is t

I would like to ask you, I am also changing the PWM duty cycle in real time, and this duty cycle is calculated from the voltage and current in the circuit, and then a PWM wave is generated, and the switch is controlled, how to generate such a PWM wave, in Simulink.

As shown in the figure, this is a model for the generation of a three-phase SPWM wave. The PWM waveform is formed by modulating the wave + carrier comparison to control the IGBT. The modulated wave controls the output voltage, and the carrier controls the IGBT switching frequency.

For details, please refer to PWM.

Set up the following model in Simulink: (If you are using an oscilloscope to display data type transformation, there are two oscilloscopes for three-way signal display).

2. Among them, the constant set of the modulation wave, the carrier setting parameters and the corresponding carrier waveform are as follows.

4. If you want to adjust the duty cycle of the pulse, keep the carrier constant and adjust the modulated wave. Here, the modulated wave constant is set to 0 as shown below with a pulse duty cycle of 50.

Use the Pulse Generator module in Simulink to set the parameters of the module, such as period to set the pulse period, pulse width to set the duty cycle, and phase delay to set the phase delay.

Ask the big guy for instructions, but you can't connect to the circuit.

How does Arduino output PWM signals with adjustable duty cycles? How to use the PWM signal pin.

;pifunction get_spwm()global g_n;32768 % sine amplitude 0 1format long

g_k=2*g_n/

for tmp=1;

global g_spwm..I have this;

g_spwm(2*tmp)=spwm_close_point(tmp):g_n*2 %

g_m=16384/..:g_n

g_spwm(2*tmp-1)=spwm_open_point(tmp);

endg_spwm

clearglobal g_m

global g_n

global g_k

global g_spwm

g n = 32 % of the number of semi-periodic triangular waves.

g_spwm=1..

I have this;

clearglobal g_m

global g_n

global g_k

global g_spwm

g n=32 % number of semi-periodic triangular waves, g spwm=1:g n*2 %g m=16384 32768 % sine wave amplitude 0 1

format long

g_k=2*g_n/pi

function get_spwm()

global g_n;

global g_spwm;

for tmp=1:g_n

g_spwm(2*tmp-1)=spwm_open_point(tmp);

g_spwm(2*tmp)=spwm_close_point(tmp);

endg_spwm