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.

Chip Technology Based on High Efficiency DC Power Supply

2014 ◽  
Vol 1030-1032 ◽  
pp. 1384-1387
Author(s):  
Hao Wang ◽  
Dian Ren Chen
Keyword(s):  
Power Supply ◽  
High Efficiency ◽  
Switching Power Supply ◽  
Switching Power ◽  
Turn On ◽  
Dc Power ◽  
Switching Transistor ◽  
Chip Technology ◽  
Off Time ◽  
Pipe Work

The switching power supply is the use of modern power electronics, by controlling the switching transistor turn-on and turn-off time ratio, maintaining a stable output voltage of the power supply. Switching power supply technology at the core, it is mainly divided into AC / DC and DC / DC two categories. Switching power supply eliminates bulky frequency transformers, replacing tens of kHz, MHz or even hundreds of kHz frequency transformer. Since the adjustment pipe work in the off state, and thus low power consumption and high efficiency.

High-efficiency high-speed (60-GHz) InGaAsP multimode waveguide photodetectors

1997 ◽  
Author(s):  
Jean C. Renaud ◽  
Francois A. Deborgies ◽  
Y. Combemale ◽  
Robert R. Blondeau ◽  
Jean-Pascal Duchemin ◽  
...  
Keyword(s):  
High Speed ◽  
High Efficiency ◽  
Multimode Waveguide ◽  
60 Ghz

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 A Transformer Class E Amplifier

2014 ◽  
Vol 63 (4) ◽  
pp. 621-633 ◽  
Author(s):  
Miroslaw Mikolajewski
Keyword(s):  
Output Power ◽  
High Efficiency ◽  
Supply Voltage ◽  
Maximum Output Power ◽  
Switching Frequency ◽  
Maximum Output ◽  
Theoretical Predictions ◽  
Inductive Component ◽  
Isolation Transformer ◽  
Class E

Abstract In a high-efficiency Class E ZVS resonant amplifier a matching and isolation transformer can replace some or even all inductive components of the amplifier thus simplifying the circuit and reducing its cost. In the paper a theoretical analysis, a design example and its experimental verification for a transformer Class E amplifier are presented. In the experimental amplifier with a transformer as the only inductive component in the circuit high efficiency ηMAX = 0.95 was achieved for supply voltage VI = 36 V, maximum output power POMAX = 100 W and the switching frequency f = 300 kHz. Measured parameters and waveforms showed a good agreement with theoretical predictions. Moreover, the relative bandwidth of the switching frequency was only 19% to obtain output power control from 4.8 W to POMAX with efficiency not less than 0.9 in the regulation range.

scholarly journals 40 kW/L High Switching Frequency Three-Phase AC 400 V All-SiC Inverter

2013 ◽  
Vol 740-742 ◽  
pp. 1081-1084 ◽  
Author(s):  
Kensuke Sasaki ◽  
Shinji Sato ◽  
Kohei Matsui ◽  
Yoshinori Murakami ◽  
Satoshi Tanimoto ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Output Power ◽  
High Speed ◽  
Switching Frequency ◽  
Test Results ◽  
Circuit Boards ◽  
High Switching Frequency ◽  
Three Phase ◽  
Drive Circuit ◽  
Forced Air

We, the R&D Partnership for Future Power Electronics Technology (FUPET), have reported a forced-air-cooled DC 600 V three-phase AC 400 V inverter built with SiC-JFETs and SiC-SBDs and designed to attain an output power density (OPD) of 40 kW/L with a switching frequency (fSW) of 50 kHz. This paper reports the test results of this inverter attaining an OPD of 40 kW/L in operating a 3-phase motor with fSW = 50 kHz, and an OPD of more than 60 kW/L in operating an equivalent circuit with fSW = 20 kHz by adopting specialized high speed drive circuit boards.

An Optimal Rapid Energy-Storing Design for the Stackable Piezoelectric Power Generation Devices

2012 ◽  
Vol 590 ◽  
pp. 189-194 ◽  
Author(s):  
Ching Wu Wang ◽  
Tsun Kai Hsu ◽  
Ji Han Wu ◽  
Jui Hsiang Cheng ◽  
Chew Wei Yang ◽  
...  
Keyword(s):  
Power Generation ◽  
Energy Storage ◽  
Output Power ◽  
High Efficiency ◽  
Storage System ◽  
Energy Storage System ◽  
Buck Converter ◽  
Optimal Arrangement ◽  
Power Generation Device ◽  
Mh Battery

The optimal design for stackable piezoelectric power generation device and its micropower energy storage method is presented in this work. In this configuration, three different arrangement designs of piezoelectric power generation devices were put and compared for obtaining a greater produced output power. Evidence shows that the Sample 2 among the three different arrangement stackable piezoelectric power generation devices could avoid damage to the PZT-5H and achieve a highest instantaneous output power (5.175mW). Moreover, to establish the high efficiency energy storage system, using low power buck converter IC (LTC3588-1) was proposed. The obtained results show that a 15mAh Ni-MH battery could be fully-charged within two hours by utilizing the optimal arrangement design stackable piezoelectric power generation device combining with micropower energy storage system.

High-Efficiency CTS Charge Pump Using Three-Level Addressing Method

2011 ◽  
Vol 145 ◽  
pp. 562-566
Author(s):  
Yung Chin Chen ◽  
Kun Long Zheng ◽  
Zong Ye Wu ◽  
Kai Wei Chang ◽  
Chie Nan Lai
Keyword(s):  
Output Power ◽  
Power Efficiency ◽  
High Efficiency ◽  
Low Voltage ◽  
Charge Pump ◽  
Switching Frequency ◽  
Pump Efficiency ◽  
Output Stage ◽  
Dc Voltage ◽  
Charge Pump Circuit

This paper proposes a new addressing method for high-efficiency switching-capacitor DC-DC voltage converter based on combination of CTS (charge-transfer-switch) charge pump and cross-coupled output stage is proposed in order to get a high output power and pump-efficiency. By using three level addressing methods, it can increase both of pump-efficiency and power-efficiency. The proposed three level addressing mixed-structure charge pump can operate at as high as 1MHz switching-frequency on the 0.1 μF pump-capacitors. Simulation by using HSPICE level 3 model shows that our work can convert the input low DC-voltage (Vin=1.5V) up near to 11.26 times of it (VOUT=16.9V), so that more output power can be generated with a little power loss. The newly proposed addressing method for DC-DC charge pump circuit is suitable for various low-voltage applications.

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