Voltage control utilizing multiple PWM patterns
摘要
說明書
One method of controlling the voltage at a device may be to directly regulate the voltage with rectified transformer voltage regulation. However, rectified transformer voltage regulation includes inefficiencies that translate to loss of power. A more efficient method of regulating voltage is referred to as pulse-width management (PWM) voltage regulation. In PWM voltage regulation, voltage is not directly controlled. Rather, electricity is delivered to a device in pulses at constant voltage over a period of time. The average voltage over time of the electricity output by the power source is the voltage perceived by the device. For example, if a fan is fed a 1-second burst of 12 V electricity every other second (i.e., 12 volts in the first second, 0 V in the second, 12 volts in the third second, and so on) the device may perceive receiving a constant 6 V of electricity over the total time.
However, powering sensitive devices with PWM electricity requires smoothing out the electricity provided to the device to avoid the device malfunctioning due to constant changes in current and voltage. One method of smoothing out power involves passing PWM electricity through one or both of an inductor and a capacitor before delivering the electricity to the device. This may help to transform distinct pulses of electricity to a smoother flow of electricity.
