Why does the PWM Generator (DC-DC) block not work for negative time?

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Micah Anderson
Micah Anderson 2020-2-21
回答： Sabin 2025-8-12
I've attached a simple Simulink model that runs from -0.1 seconds to 0.1 seconds. The PWM Generator (DC-DC) block doesn't seem to work for negative time. (It outputs a constant 1 until time reaches 0.) Is this expected? If so, why? Should I generally avoid running simulations with negative time?

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Sabin
Sabin 2025-8-12
The block you are using is not suitable for negative simulation time. For simulation involving both negative and positive simulation time the following options will be more suitable:
PWM Generator in Simscape Electrical - https://www.mathworks.com/help/sps/ref/pwmgenerator.html
PWM block in Simulink - https://www.mathworks.com/help/simulink/slref/pwm.html

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