UPS Inverted By IGBT With Constant Current And High Power Factor

UPS is the abbreviation of Uninterruptible Power Supply, or power supply without interruption. In general power supplies with such characteristic are named UPS. UPS is not only a spare power supply, but also one with the ability to filter the power input . With the development and application of computers, various office equipment and electron apparatus, UPS is put into use widely.As the object of the task, UPS inverted by IGBT with constant current adjusting and high power factor (abbreviated to UPS with constant current) is known from others by: 1 , high power factor as to the power system 2 , constant current output at different level according to the demand (from zero load to rating load).The text is divided into seven chapters to deal with the UPS with constant current. Chapter One summarizes the functions and theory of UPS, introducing the UPS with constant current briefly. Chapter Two expatiate mainly the function principle of the UPS with constant current as the electric power is available, interpreting how the UPS can realize high power factor. Chapter Three explains how the UPS with constant current supply the power, as the electric power is not available. Chapter Four chiefly tells of accumulator and its charging circuit. As the heart of UPS, accumulator occupies the position second to none. Chapter Five introduces simply the static switch and its control circuit. Static switch is the bridge between electric power supply and accumulator supply. Chapter Six makes out the drive and control circuit of IGBT. Chapter Seven sums up the testing result of the UPS with constant current.