电感器
脉冲宽度调制
占空比
调制(音乐)
控制理论(社会学)
电容器
脉冲频率调制
转换器
电子工程
电流(流体)
CMOS芯片
波形
电压
计算机科学
工程类
物理
电气工程
脉搏(音乐)
脉冲幅度调制
人工智能
控制(管理)
声学
作者
Woojin Hong,Myunghee Lee
标识
DOI:10.1109/jssc.2020.3047000
摘要
In this article, a dual-ramp modulation scheme is proposed to solve an instability during the discontinuous conduction mode (DCM) operation of current-mode constant on-time (COT) controlled boost converters. A duty cycle-dependent auxiliary waveform, which is generated by the proposed capacitor-coupled common-drain amplifier (CCCDA), is summed with an inductor current information to form a current feedback loop. With the proposed scheme, the pulse frequency modulation (PFM) operation can be spontaneously accompanied by the current-mode COT control to enhance a light-load efficiency. In addition, a translinear loop (TLL)-based valley current sensor is introduced to sense a valley inductor current while solving the response time and stability problems of the previous SenseFET-based current sensor. An adaptive ON-time (AOT) generator provides a quasi-fixed switching frequency in the CCM operation regardless of the conversion ratio. The proposed boost converter has been fabricated using a 0.18- μm CMOS process with a total chip area of 1.23 mm × 1.37 mm. It achieves a peak efficiency of 94.5% even at a high-switching frequency of 10 MHz, and smooth mode transition between PFM and pulsewidth modulation (PWM) operations depending on the load conditions.
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