Pulses and trigger signals (triggers)

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Let's assume that we have a rectangular signal with a pulse duration of 10 ms and a duty cycle of 25%. We need to find the frequency of this signal.

The duty cycle is 25% or ¼, which is the same as the pulse width, which is 10ms. So the signal period should be: 10ms (25%) + 30ms (75%) = 40ms (100%).

Hz

Square waves can be used to control the amount of loan data delivered to a load, such as a lamp or a motor, by varying the duty cycle of the signal. The higher the duty cycle, the more average power must be delivered to the load, and the lower the duty cycle, the less average power delivered to the load. A great example of this is the use of pulse width modulation in speed controllers. The term pulse width modulation (PWM) literally means "varying the width of the pulse".

Although triggers and pulses are technically two separate types of signals, the differences between them are minor. A trigger is just a very narrow pulse. The difference is that a trigger can be either positive or negative polarity, whereas a pulse is only positive.

The pulse shape, or pulse train as they are more commonly called, is a type of non-sinusoidal waveform similar to a rectangular wave. The difference is that the pulse signal is often defined only by the duty cycle. For a trigger signal, the positive portion of the signal is very short with sharp rise and fall, and its duration can be neglected compared to the period.


Very short pulses and trigger signals are intended to control moments in time at which, for example, a timer or counter is started, logic triggers are switched, and also to control thyristors, triacs, and other power semiconductor devices.

I have considered here only the basic types of electrical signals. Other types of signals are usually obtained by their combination or modulation (changing parameters using another signal), for example: