公开(公告)号：US09577509B2

公开(公告)日：2017-02-21

申请号：US14260690

申请日：2014-04-24

Applicant: Analog Devices Global

Inventor： Basa Wang ,  Zhijie Zhu

IPC: H02M1/32 ,  H02M3/156 ,  H02M1/00

CPC classification number: H02M1/32 ,  H02M3/156 ,  H02M2001/0009

Abstract: An apparatus comprises a switching circuit, an error amplifier circuit, a current threshold circuit, and an over-current detection circuit. The switching circuit provides a switching duty cycle that includes a charge portion and a discharge portion. The error amplifier circuit generates an error signal representative of a difference between a target voltage value and a voltage at an output of the voltage regulator circuit. The switching circuit adjusts the switching duty cycle to regulate the voltage at the output using the error signal and a reference waveform signal. The current threshold circuit generates an adaptive peak current limit threshold. The over-current detection circuit generates an over-current signal when the reference waveform signal satisfies the adaptive peak current limit threshold during the charging portion of the switching cycle. The switching circuit interrupts one or more switching cycles when the reference waveform signal satisfies the adaptive peak current limit threshold.

Abstract translation: 一种装置包括开关电路，误差放大器电路，电流阈值电路和过电流检测电路。 开关电路提供包括充电部分和放电部分的开关占空比。 误差放大器电路产生表示目标电压值与电压调节器电路输出端的电压之差的误差信号。 开关电路调整开关占空比，以使用误差信号和参考波形信号来调节输出端的电压。 电流阈值电路产生自适应峰值电流限制阈值。 当在开关周期的充电部分中参考波形信号满足自适应峰值电流限制阈值时，过电流检测电路产生过电流信号。 当参考波形信号满足自适应峰值电流限制阈值时，开关电路中断一个或多个开关周期。