scholarly journals A Fast and Simple Fault Diagnosis Method for Interleaved DC-DC Converters Based on Output Voltage Analysis

Electronics ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 1451
Author(s):  
Po Li ◽  
Xiang Li ◽  
Tao Zeng
Keyword(s):  
Output Voltage ◽  
High Efficiency ◽  
Tidal Energy ◽  
Open Circuit ◽  
Buck Converter ◽  
Switching Frequency ◽  
Harmonic Amplitude ◽  
Non Invasive ◽  
New Energy ◽  
Diagnosis Method

Interleaved DC-DC converters have been widely used in power conversion due to their high efficiency and reliability. In the application of new energy, this plays an increasingly important role in the grid-connected power generation of wind, solar, and tidal energy. Therefore, it is crucial to ensure the reliability and proper operation of interleaved DC-DC converters. We studied an open circuit fault (OCF) diagnosis method for a three-phase interleaved buck converter. We propose a non-invasive diagnosis method based on the output voltage using the harmonic amplitude and phase at the switching frequency as the diagnostic criteria. Evaluation was carried out on a hardware-in-the-loop (HIL) test platform to prove the validity of the proposed method. The results show that the presented method had high accuracy and robustness against OCFs, which could otherwise damage the system.

scholarly journals High-Flexibility MPPT Techniques with Communication Scan Network for PV Micro-Grid System

Processes ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 117
Author(s):  
Yu-Kai Chen ◽  
Hong-Wen Hsu ◽  
Chau-Chung Song ◽  
Yu-Syun Chen
Keyword(s):  
Output Voltage ◽  
High Efficiency ◽  
Maximum Power ◽  
Global Maximum ◽  
Switching Frequency ◽  
Grid System ◽  
Pv System ◽  
In Series ◽  
Micro Grid ◽  
High Flexibility

This paper proposes the design and implementation of inductor-inductor-capacitor (LLC) converters with modules connected in series with the power scan method and communication scan network (CSN) to achieve MPPT and regulate the output voltage for the PV micro-grid system. The Dc/Dc converters includes six isolated LLC modules in series to supply ±380 V output voltage and track the maximum power point of the PV system. The series LLC converters are adopted to achieve high efficiency and high flexibility for the PV micro-grid system. The proposed global maximum power scan technique is implemented to achieve global maximum power tracking by adjusting the switching frequency of the LLC converter. To improve the system flexibility and achieve system redundancy, module failure can be detected in real time with a communication scan network, and then the output voltage of other modules will be changed by adjusting the switching frequency to maintain the same voltage as before the failure. Additionally, the proposed communication scan network includes the RS-485 interface of the MPPT series module and the CAN BUS communication interface with other subsystems’ communication for the PV micro-grid application system. Finally, a 6 kW MPPT prototype with a communication scan network is implemented and the proposed control method is verified for the PV system.

scholarly journals Novel Step-Down DC–DC Converters Based on the Inductor–Diode and Inductor–Capacitor–Diode Structures in a Two-Stage Buck Converter

Energies ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 1131 ◽  
Author(s):  
Mauricio Dalla Vecchia ◽  
Giel Van den Broeck ◽  
Simon Ravyts ◽  
Johan Driesen
Keyword(s):  
Output Voltage ◽  
Buck Converter ◽  
Switching Frequency ◽  
Two Stage ◽  
Voltage Level ◽  
Multiple Strategies ◽  
Power Electronics Converters ◽  
Load Demand ◽  
Duty Cycles ◽  
Step Down

This paper explores and presents the application of the Inductor–Diode and Inductor-Capacitor-Diode structures in a DC–DC step-down configuration for systems that require voltage adjustments. DC micro/picogrids are becoming more popular nowadays and the study of power electronics converters to supply the load demand in different voltage levels is required. Multiple strategies to step-down voltages are proposed based on different approaches, e.g., high-frequency transformer and voltage multiplier/divider cells. The key question that motivates the research is the investigation of the aforementioned Inductor–Diode and Inductor–Capacitor–Diode, current multiplier/divider cells, in a step-down application. The two-stage buck converter is used as a study case to achieve the output voltage required. To extend the intermediate voltage level flexibility in the two-stage buck converter, a second switch was implemented replacing a diode, which gives an extra degree-of-freedom for the topology. Based on this modification, three regions of operation are theoretically defined, depending on the operational duty cycles δ2 and δ1 of switches S2 and S1. The intermediate and output voltage levels are defined based on the choice of the region of operation and are mapped herein, summarizing the possible voltage levels achieved by each configuration. The paper presents the theoretical analysis, simulation, implementation and experimental validation of a converter with the following specifications; 48 V/12 V input-to-output voltage, different intermediate voltage levels, 100 W power rating, and switching frequency of 300 kHz. Comparisons between mathematical, simulation, and experimental results are made with the objective of validating the statements herein introduced.

scholarly journals A Novel Buck Converter with Constant Frequency Controlled Technique

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5911
Author(s):  
Hsiao-Hsing Chou ◽  
Hsin-Liang Chen
Keyword(s):  
Output Voltage ◽  
Maximum Load ◽  
Buck Converter ◽  
Design Concept ◽  
Frequency Variation ◽  
Switching Frequency ◽  
Circuit Realization ◽  
Constant Frequency ◽  
Scheme Design ◽  
Control Scheme

This paper presents a buck converter with a novel constant frequency controlled technique, which employs the proposed frequency detector and adaptive on-time control (AOT) logic to lock the switching frequency. The control scheme, design concept, and circuit realization are presented. In contrast to a complex phase lock loop (PLL), the proposed scheme is easy to implement. With this novel technique, a buck converter is designed to produce an output voltage of 1.0–2.5 V at the input voltage of 3.0–3.6 V and the maximum load current of 500 mA. The proposed scheme was verified using SIMPLIS and MathCAD. The simulation results show that the switching frequency variation is less than 1% at an output voltage of 1.0–2.5 V. Furthermore, the recovery time is less than 2 μs for a step-up and step-down load transient. The circuit will be fabricated using UMC 0.18 μm 1P6M CMOS processes. The control scheme, design concept and circuit realization are presented in this paper.

scholarly journals Realization with Fabrication of Double-Gate MOSFET Based Buck Regulator

2021 ◽  
pp. 66-75
Author(s):  
Simone Leeuw ◽  
◽  
Viranjay M. Srivastava
Keyword(s):  
Output Voltage ◽  
High Efficiency ◽  
Research Work ◽  
Drain Current ◽  
Input Voltage ◽  
Switching Frequency ◽  
Maximum Output ◽  
Double Gate ◽  
Dg Mosfet ◽  
Double Gate Mosfet

The traditional buck regulator provides the steady output voltage with high efficiency and low power dissipation. Various parameters of this regulator can be improved by the placement of Double-Gate (DG) MOSFET. The double-gate MOSFET provides twice the drain current flow, which improves the various parameters of buck regulator structure and inevitably increases the device performance and efficiency. In this research work, these parameters have been analyzed with implemented DG MOSFET buck regulator and realized the total losses 42.676 mW and efficiency 74.208%. This research work has designed a DG MOSFET based buck regulator with the specification of input voltage 12 V, output voltage 3.3 V, maximum output current 40 mA, switching frequency 100 kHz, ripple current of 10%, and ripple voltage of 1%.

scholarly journals Design and Implementation of an Active Clamped Full Wave Quasi Resonant ZCS Boost Converter

2019 ◽  
Vol 8 (2S5) ◽  
pp. 66-72
Keyword(s):  
Power Factor ◽  
Output Voltage ◽  
Closed Loop ◽  
High Efficiency ◽  
Voltage Regulation ◽  
Boost Converter ◽  
Switching Frequency ◽  
Closed Loop Control ◽  
Loop Control ◽  
Full Wave

This paper presents a closed loop control of an active-clamped full-wave quasi-resonant boost converter with zero-current-switching (ZCS) for power factor correction. Possibility to incorporate higherswitching frequency and has some potency to reduce switching losses. Power factor improvement and high efficiency is achieved with a constant output voltage and DC output voltage is regulated by using closed loop control .The concept of the proposed switchingscheme results lesser switching loss, higher efficiency, possibility to have higher switching frequency, and has potential to reduce converter's conducted EMI. This paper also presents voltage regulation using closed loop system and the simulation results are verified.

scholarly journals High-efficiency Bidirectional Buck–Boost Converter for Residential Energy Storage System

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3786 ◽  
Author(s):  
Seok-Hyeong Ham ◽  
Yoon-Geol Choi ◽  
Hyeon-Seok Lee ◽  
Sang-Won Lee ◽  
Su-Chang Lee ◽  
...  
Keyword(s):  
Energy Storage ◽  
Output Voltage ◽  
High Efficiency ◽  
Storage System ◽  
Core Loss ◽  
Input Voltage ◽  
Switching Frequency ◽  
Input Output ◽  
Voltage Range ◽  
Output Filter

This paper proposes a bidirectional dc–dc converter for residential micro-grid applications. The proposed converter can operate over an input voltage range that overlaps the output voltage range. This converter uses two snubber capacitors to reduce the switch turn-off losses, a dc-blocking capacitor to reduce the input/output filter size, and a 1:1 transformer to reduce core loss. The windings of the transformer are connected in parallel and in reverse-coupled configuration to suppress magnetic flux swing in the core. Zero-voltage turn-on of the switch is achieved by operating the converter in discontinuous conduction mode. The experimental converter was designed to operate at a switching frequency of 40–210 kHz, an input voltage of 48 V, an output voltage of 36–60 V, and an output power of 50–500 W. The power conversion efficiency for boost conversion to 60 V was ≥98.3% in the entire power range. The efficiency for buck conversion to 36 V was ≥98.4% in the entire power range. The output voltage ripple at full load was <3.59 Vp.p for boost conversion (60 V) and 1.35 Vp.p for buck conversion (36 V) with the reduced input/output filter. The experimental results indicate that the proposed converter is well-suited to smart-grid energy storage systems that require high efficiency, small size, and overlapping input and output voltage ranges.

scholarly journals Extra-High-Voltage DC-DC Boost Converters Topology with Simple Control Strategy

2008 ◽  
Vol 2008 ◽  
pp. 1-8 ◽  
Author(s):  
P. Sanjeevikumar ◽  
K. Rajambal
Keyword(s):  
High Voltage ◽  
Output Voltage ◽  
Control Algorithm ◽  
High Efficiency ◽  
Low Cost ◽  
Buck Converter ◽  
Boost Converters ◽  
Wide Range ◽  
Power Transfer Efficiency ◽  
Extra High Voltage

This paper presents the topology of operating DC-DC buck converter in boost mode for extra-high-voltage applications. Traditional DC-DC boost converters are used in high-voltage applications, but they are not economical due to the limited output voltage, efficiency and they require two sensors with complex control algorithm. Moreover, due to the effect of parasitic elements the output voltage and power transfer efficiency of DC-DC converters are limited. These limitations are overcome by using the voltage lift technique, opens a good way to improve the performance characteristics of DC-DC converter. The technique is applied to DC-DC converter and a simplified control algorithm in this paper. The performance of the controller is studied for both line and load disturbances. These converters perform positive DC-DC voltage increasing conversion with high power density, high efficiency, low cost in simple structure, small ripples, and wide range of control. Simulation results along theoretical analysis are provided to verify its performance.

scholarly journals Adaptive On-Time Buck Converter with Wave Tracking Reference Control for Output Regulation Accuracy

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3809
Author(s):  
Pang-Jung Liu ◽  
Mao-Hui Kuo
Keyword(s):  
Output Voltage ◽  
Output Regulation ◽  
Buck Converter ◽  
Maximum Efficiency ◽  
Frequency Variation ◽  
Switching Frequency ◽  
Maximum Output ◽  
Equivalent Series Resistance ◽  
Load Current ◽  
Dc Offset

A ripple-based constant on-time (RBCOT) buck converter with a virtual inductor current ripple (VICR) control can relax the stability constraint of large equivalent series resistance (ESR) at an output capacitor, but output regulation accuracy deteriorates due to the issue with output DC offset. Thus, this paper proposes a wave tracking reference (WTR) control to improve converter stability with low ESR and concurrently eliminate output DC offset on the regulated output voltage. Moreover, an adaptive on-time (AOT) circuit is presented to suppress the switching frequency variation with load current changes in continuous conduction mode. A prototype chip was fabricated in 0.35 µm CMOS technology for validation. The measurement results demonstrate that the maximum output DC offset is 4.1 mV and the output voltage ripple is as small as 3 mV. Furthermore, the switching frequency variation with the AOT circuit is 11 kHz when load current changes from 50 mA to 500 mA, and the measured maximum efficiency is 90.9% for the maximum output power of 900 mW.

scholarly journals A novel high efficiency CMOS RF/DC power harvester based on constant on/off time buck controller for 60GHz frequency band

2017 ◽  
Vol 14 (1) ◽  
pp. 133-148
Author(s):  
Marko Ninic ◽  
Radivoje Djuric
Keyword(s):  
Output Power ◽  
High Speed ◽  
High Efficiency ◽  
Buck Converter ◽  
Switching Frequency ◽  
60 Ghz ◽  
Voltage Reference ◽  
Correct Operation ◽  
Dc Power ◽  
Off Time

A novel 60 GHz RF/DC power harvesting system is presented. The system consists of RF to DC rectifier and a DC/DC Buck converter based on constant ON/OFF time (COOT) control. The rectifier has a structure of voltage doubler, but employs diodes that have lower parasitics compared to those of the standard MOSFET diodes, resulting in improved power conversion efficiency. The peak efficiency of the rectifier obtained with the extracted parasitics for the output power of 1 mW is about 25%. In order to keep the output voltage of the system to 1.2 V, the COOT control in the Buck converter is used. COOT control has much better efficiency at low output powers compared to the PWM systems. For correct operation of the COOT control, auxiliary sub-blocks: a low power high-speed comparator, a hysteresis comparator, and a high-speed voltage reference are designed and presented. The maximum switching frequency in the Buck converter is about 100MHz and the whole control system has very low static power consumption. The efficiency of the overall system for the output power of 1mW is about 21%. The system is designed in 65 nm CMOS technology.

Sign in / Sign up

Export Citation Format

Share Document