公开(公告)号：US20140084883A1

公开(公告)日：2014-03-27

申请号：US13856611

申请日：2013-04-04

Applicant: ANALOG DEVICES TECHNOLOGY

Inventor： HIROHISA TANABE

IPC: H02M3/158

CPC classification number: H02M3/1582

Abstract: A “windowless” H-bridge buck-boost switching converter includes a regulation circuit with an error amplifier which produces a ‘comp’ signal, a comparison circuit which compares ‘comp’ with a ‘ramp’ signal, and logic circuitry which receives the comparison circuit output and a mode control signal indicating whether the converter is to operate in buck mode or boost mode and operates the primary or secondary switching elements to produce the desired output voltage in buck or boost mode, respectively. A ‘ramp’ signal generation circuit operates to shift the ‘ramp’ signal up by a voltage Vslp(p−p)+Vhys when transitioning from buck to boost mode, and to shift ‘ramp’ back down by Vslp(p−p)+Vhys when transitioning from boost to buck mode, thereby enabling the converter to operate in buck mode or boost mode only, with no need for an intermediate buck-boost region.

Abstract translation: “无窗”H桥降压升压开关转换器包括具有产生“comp”信号的误差放大器的调节电路，将“comp”与“斜坡”信号进行比较的比较电路和接收比较的逻辑电路 电路输出和指示转换器是否以降压模式或升压模式操作的模式控制信号，并分别操作一级或二级开关元件以产生降压或升压模式中的期望输出电压。 “斜坡”信号发生电路在从降压转换到升压模式时将“斜坡”信号向上移动一个电压Vslp（p-p）+ Vhys，并将“斜坡”下移Vslp（p-p） + Vhys从升压转换到降压模式，从而使转换器只能在降压模式或升压模式下工作，无需中间降压 - 升压区域。