Patent ID: 9379575
Filing Date: 2016-06-28
CPC Classification: B60L,H01M,H02J,H02M,Y02E,Y02T

Claim Text:
1. A method of charging a battery in a charging system having a power convertor that converts AC electrical power to DC electrical power, the method comprising: operating the power convertor at a first frequency during a first charging phase of the charging system; monitoring a power output value of the power convertor during the first charging phase, wherein a predetermined criterion is satisfied when the power output value drops below a threshold power output value; ending the first charging phase upon determining that the predetermined criterion is satisfied; and subsequent to ending the first charging phase, operating the power convertor at a second frequency during a second charging phase of the charging system, wherein the first frequency is different than the second frequency, and operation of the power convertor the first frequency at a first power output value causes audible noise at a lower level than operation of the power convertor at the second frequency at the threshold power output value.