Patent ID: 7405526
Filing Date: 2008-07-29
Classification: H02J

Abstract:
1. A control apparatus for use in a voltage conversion apparatus which converts, for output, a DC voltage supplied from a chargeable and dischargeable storage battery into a desired voltage through switching operation of a switching element, the control apparatus capable of controlling a voltage conversion ratio by adjusting a duty ratio of a switching control signal to be supplied to the switching element, comprising: an acceptable range setting unit for setting the acceptable range of the duty ratio of a switching control signal based on power characteristics of the storage battery representing a relationship of the power of the storage battery relative to the duty ratio; a duty ratio limit unit for limiting the duty ratio of the switching control signal such that the duty ratio falls in the acceptable range; and a state of charge acquiring unit for acquiring information about a state of charge of the storage battery, wherein the acceptable range setting unit changes the acceptable range relative to variation in the state of charge of the storage battery.