Some embodiments of the present disclosure are described with regard to utilizing multiple simultaneous cyclic PWM patterns of varying frequencies in order to attain both converter efficiency and fast response to large changes in voltage. However, in some embodiments of the present disclosure, one or more voltage controller may control voltage by, in addition to or instead of some or all of the discussed methods for using multiple patterns, varying the length of a PWM cycle in response to a voltage change above a voltage-change threshold. This may be beneficial, for example, when it is not feasible or practical to maintain multiple simultaneous cyclic PWM patterns of different lengths. Rather, in some embodiments one cyclic PWM pattern may be utilized with one by one or more controllers, but the PWM period (i.e., the length of each cycle) of that cyclic PWM pattern may be increased or decreased in response to large voltage spikes or drops. This may also be beneficial in embodiments with multiple voltage controllers or one voltage controller operating at multiple frequencies. For example, in a system with two voltage controllers, an oversampling voltage controller may override the decisions of a steady-state voltage controller if it detects a voltage change above a first threshold. However, the oversampling voltage controller may also monitors voltage changes with respect to a second threshold that is larger than the first threshold. If the oversampling voltage controller identifies a voltage change above this second threshold, it may imply a more dangerous voltage situation, and the oversampling controller may reduce the length of the PWM cycle as a result.