A High-Light-Load-Efficiency, Low-Ripple-Voltage PFM Buck Converter for IoT Applications

2021 ◽  
pp. 1-1
Author(s):  
Jong-Seok Kim ◽  
Jin-O Yoon ◽  
Byong-Deok Choi
Keyword(s):  
Buck Converter ◽  
High Light ◽  
Iot Applications ◽  
Light Load

scholarly journals A PWM/PFM Dual-Mode DC-DC Buck Converter with Load-Dependent Efficiency-Controllable Scheme for Multi-Purpose IoT Applications

Energies ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 960
Author(s):  
Myeong Woo Kim ◽  
Jae Joon Kim
Keyword(s):  
Power Efficiency ◽  
Buck Converter ◽  
Maximum Efficiency ◽  
Switching Frequency ◽  
Cmos Process ◽  
Dual Mode ◽  
Pulse Frequency Modulation ◽  
Heavy Load ◽  
Iot Applications ◽  
Light Load

This paper presents a dual-mode DC-DC buck converter including a load-dependent, efficiency-controllable scheme to support multi-purpose IoT applications. For light-load applications, a selectable adaptive on-time pulse frequency modulation (PFM) control is proposed to achieve optimum power efficiency by selecting the optimum switching frequency according to the load current, thereby reducing unnecessary switching losses. When the inductor peak current value or converter output voltage ripple are considered in some applications, its on-time can be adjusted further. In heavy-load applications, a conventional pulse width modulation (PWM) control scheme is adopted, and its gate driver is structured to reduce dynamic current, preventing the current from shooting through the power switch. A proposed dual-mode buck converter prototype is fabricated in a 180 nm CMOS process, achieving its measured maximum efficiency of 95.7% and power density of 0.83 W/mm2.

scholarly journals Method for improving ripple reduction during phase shedding in multiphase buck converters for SCADA systems

2021 ◽  
Vol 24 (1) ◽  
pp. 29
Author(s):  
Mini P. Varghese ◽  
A. Manjunatha ◽  
T. V. Snehaprabha
Keyword(s):  
Power Supply ◽  
Integrated Circuit ◽  
Buck Converter ◽  
Multiphase System ◽  
Processing Unit ◽  
Central Processing ◽  
Light Load ◽  
Field Programmable ◽  
Ripple Reduction ◽  
Application Specific Integrated Circuit

In the current digital environment, central processing unit (CPUs), field programmable gate array (FPGAs), application-specific integrated circuit (ASICs), as well as peripherals, are growing progressively complex. On motherboards in many areas of computing, from laptops and tablets to servers and Ethernet switches, multiphase phase buck regulators are seen to be more common nowadays, because of the higher power requirements. This study describes a four-stage buck converter with a phase shedding scheme that can be used to power processors in programmable logic controller (PLCs). The proposed power supply is designed to generate a regulated voltage with minimal ripple. Because of the suggested phase shedding method, this power supply also offers better light load efficiency. For this objective, a multiphase system with phase shedding is modeled in MATLAB SIMULINK, and the findings are validated.

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