![]() An example of an older alternative is a simple transistor circuit that varies the current passing through it by varying its resistance. The answer to both questions is: PWM varies the speed of the appliances’ motors so they only consume as much power as they need, but without the usual consequence of burning off unused current as heat. In this day and age, if a device is advertised as having a variable speed compressor or variable speed fan (this doesn’t include two or three-speed fans), there is a significant chance that it is utilizing PWM! Why Use PWM?Īspiring electrical engineers may want to know why they should use pulse width modulation to control devices, and homeowners have similar question which has the same answer: Why use inverter air conditioners, or other variable speed appliances? For example, inverter air conditioners can consume less than half the energy that their non-inverter counterparts do in some cases. Pulse width modulation has changed the world by slashing the power consumption of appliances utilizing motors such as inverter air conditioners , inverter refrigerators, inverter washing machines, among many others. Hybrid and electric vehicle motor drive circuits.Existing applications for PWM include, but are not limited to: ![]() Pulse Width Modulation (PWM) is a nifty current control technique that enables you to control the speed of motors, heat output of heaters, and much more in an energy-efficient (and usually quieter) manner. ![]() By Nicholas Brown – Follow me on Twitter.
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