Patent ID: 9160236
Filing Date: 2015-10-13
Classification: H02M,Y02B

Abstract:
1. A method, comprising: controlling burst-mode operation of a converter having an oscillator configured to set a switching frequency of on-off driven power switches of the converter in response to a feedback control signal based on an output error voltage of the converter; operating the oscillator, when a load on the converter is light, relative to a maximum capacity of the converter, in a hysteretically controlled burst-mode including causing said oscillator to stop oscillating when said feedback control signal reaches a first threshold value; and introducing a nonlinearity in a derivative of a functional relation between the switching frequency and said feedback control signal, while the feedback control signal is between a lower, second threshold value, and the first threshold value and the oscillator is not in the burst-mode, such that the switching frequency remains equal to or smaller than a value of the switching frequency when the feedback control signal is equal to the second threshold value.