Voltage control utilizing multiple PWM patterns
摘要
說明書
A second cyclic control pattern may have a period that is far slower than the short measurement and PWM periods. At the beginning of each cyclic measurement pattern, the control system receives a measurement of the voltage at the load device. If the measurement suggests that a large change in voltage is not occurring (i.e., the device is in steady state operation), the controller may activate a converter at the beginning of the next cycle of the second cyclic control pattern. However, if the measurement suggests that a large change in voltage is occurring, the controller may activate a converter at the beginning of the next cycle of the first (faster) cyclic control pattern. This may enable the system to respond faster to the large change in voltage, which may prevent errors in or damage to the load device. Further, because responding faster to large changes in voltage may help to mitigate those large changes in voltage, instantaneous departures from the ideal voltage may be reduced in magnitude. For that reason, the average voltage over time may be closer to the ideal voltage even before the voltage is smoothed by inductors and capacitors. This may lead to further economic benefits, such as enabling power-system designers to use fewer inductors and capacitors without risking dangerous voltage levels. This may both decrease the cost of components of a system, but also decrease the physical space of the system that is taken up by electricity-smoothing components.
