Patent ID: 7804283
Filing Date: 2010-09-28
Classification: H02M

Abstract:
1. A method of mode transitioning, comprising the steps of: driving a buck section of a DC/DC converter with a buck signal that has a buck duty cycle that is less than one while the DC/DC converter is in a buck/boost mode of operation; concurrently with driving the buck section, driving a boost section of the DC/DC converter with a boost signal that has a non-zero boost duty cycle while the DC/DC converter is in the buck/boost mode of operation, a difference existing between the buck duty cycle and the boost duty cycle; monitoring an input voltage that is coupled to the buck section for a change in the input voltage; and in response to a change in the input voltage, changing the buck duty cycle and the boost duty cycle such that the difference between the buck duty cycle and the boost duty cycle is substantially constant over substantially an entire range of values of the input voltage that corresponds to the buck/boost mode of operation.