![]() Most of the industrial process requires to be run on the certain parameters where speed of the drive is concerned. Luckily, the change of state between fully on and fully off is quite rapid (typically less than 100 nanoseconds) relative to typical on or off times, and so the average power dissipation is quite low compared to the power being delivered even when high switching frequencies are used. However, during the transitions between on and off states both voltage and current are non-zero and thus considerable power is dissipated in the switches. High frequency PWM control systems can be easily implemented using semiconductor switches.Īs has been already stated above almost no power is dissipated by the switch in either on or off state. With a sufficiently high switching frequency and, when necessary, using additional passive electronic filters the pulse train can be smoothed and average analogue waveform recovered. ![]() The drawbacks are the pulsations defined by the duty cycle, switching frequency and properties of the load. PWM can be used to adjust the total amount of power delivered to a load without losses normally incurred when a power transfer is limited by resistive means.
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