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Annual Conference of Industrial Electronics Society

作者： Hou-Wa Wong Chi-Fong Ieong Chi-Seng Lam State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macau China Institute of Microelectronics University of Macau Macau China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macau China

The wireless power transfer (WPT) technology has gained significant attention in recent years due to its potential to provide a convenient and efficient method to charging electronic devices without the need for physical connections. In wireless charging, the inductive coils are significantly important as they are the component that power transfer takes place. In this context, Multi-Objective Particle Swarm Optimization (MOPSO) has emerged as a promising technique for designing WPT coils with improved performance. Aiming to verify the performance of the designed coil, LCC-S compensation topology was utilized as it can provide practical battery charging specifications.

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A Self Bias-flip Piezoelectric Energy Harvester Array without External Energy Reservoirs achieving 488% Improvement with 4-Ratio Switched-PEH DC-DC Converter

A Self Bias-flip Piezoelectric Energy Harvester Array withou...

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Custom Integrated Circuits Conference (CICC)

作者： Zhen Li Zhiyuan Chen Man-Kay Law Sijun Du Xu Cheng Xiaoyang Zeng Jun Han State Key Laboratory of ASIC and System Fudan University Shanghai China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macau China Department of Microelectronics Delft University of Technology Delft Netherlands

With the advent of the lnternet-of-Things (1oT) era, sensor nodes are required in almost all fields to achieve a better interaction between humans and the environment. Piezoelectric energy harvester (PEH), which exhibits an equivalent electrical model of an AC current source /P in parallel with the inherent capacitor C P , is a promising technology to resolve the energy problem of such sensor nodes. Recently, inductor-based rectifiers, capacitor-based rectifiers and hybrid rectifiers have been proposed to improve the energy extraction efficiency of PEH devices [1]–[5]. However, these structures all require the aid of additional capacitors or inductors to achieve bias-flip operation, as illustrated in Fig. 1. These extra passive devices are typically large, which can be a major bottleneck in system-volumeconstrained applications such as MEMS [4]. In response to the above problem, this work proposes a novel 8-phase self bias-flip PEH interface with charge recycling and reusing (SBFRR). By using the C P of 4 PEHs as flipping capacitors, this scheme achieves a high voltage flipping efficiency without using extra energy reservoirs. The 4 C P can also serve as flying capacitors to achieve switched-PEH DC-DC (SPDC) conversion for MPPT, while maintaining a MOPIR of >3.5× with a PEH input voltage (V p ) from 0. 78Vto4.9V.

关键词： Micromechanical devices Capacitors Rectifiers Voltage Switches High-voltage techniques Reservoirs

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An Efficiency-Enhanced LCC-S Based Inductive Power Transfer Converter Throughout Battery Constant Current Charging Process

An Efficiency-Enhanced LCC-S Based Inductive Power Transfer ...

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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Yuying Luo Io-Wa Iam Zhaoyi Ding Pak-Ian Chan Chi-Seng Lam State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau Macao China Institute of Microelectronics University of Macau Macao China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau Macao China

Constant current (CC) charging is a dominant charging process before the battery can be fully charged and the battery is considered as an equivalent resistance with a wide range variation during the process. However, a wide load range variation causes the transfer efficiency of inductive power transfer (IPT) converter to deviate from the optimum point. Therefore, transfer efficiency optimization measures are required during battery CC charging process with IPT converter. Herein, this paper proposed a suitable bivariate control method for a single-stage IPT converter based on inductor-capacitor-capacitor-series (LCC-S) compensation topology, which keeps the converter output current constant and improves transfer efficiency. The newly adopted bivariate control method includes two control variables, the conduction angle of the voltage-controlled semi-active rectifier (VCSAR) and the operating frequency of the inverter. The equivalent load of the VCSAR is adjusted by controlling the conduction angle, and at the same time, the operating frequency of the inverter is controlled to ensure constant current output. Finally, simulation results are presented to verify the effectiveness of the bivariate control method for the LCC-S compensated IPT converter. In addition, zero-voltage switching (ZVS) can be realized in both sides of the converter.

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Filtering Balun Design using Hairpin-Ring Resonator and SSPP Metamaterial with Wide Notched band and Wide Stopband

Filtering Balun Design using Hairpin-Ring Resonator and SSPP...

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IEEE International Wireless Symposium (IWS)

作者： Huanhuan Qi Haiwen Liu Mo Huang School of Information and Communications Engineering Xi’ an Jiaotong University Xi'an China State Key Laboratory of Analog and Mixed-Signal VLSI Faculty of Science and Technology Department of Electrical and Computer Engineering Institute of Microelectronics University of Macau Macao China

In this paper, a novel filtering balun based on microstrip-to-slotline transition is proposed. Utilizing the inherent out-of-phase electric field distributions on the adjacent grounds of slotline, the balun function is realized. In order to realize the wide notched-band and stopband performance for radio astronomical applications, spoof surface plasmon polariton (SSPP) metamaterial and multi-mode hairpin ring resonators (HRRs) are adopted. With these novel structures loaded, the proposed filtering balun exhibits a wide band from 1GHz to 6 GHz. The notched band is from 3.2 GHz to 4.4 GHz, within the notched band, the rejection level is better than 15 dB. Besides, the out-of-band suppression is below 35 dB in the wide frequency range from 6 GHz to 8 GHz.

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Model and Data Hybrid Reinforcement Learning for Optimal Voltage-Current Control of Hybrid Active Power Filter

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IEEE Transactions on Power Electronics 2025年

作者： Gong, Cheng Lam, Chi-Seng University of Macau State Key Laboratory of Analog and Mixed-Signal VLSI 999078 China University of Macau Institute of Microelectronics 999078 China University of Alberta Department of Electrical and Computer Engineering EdmontonAB Canada University of Macau Department of Electrical and Computer Engineering Faculty of Science and Technology 999078 China

In this paper, a novel design for optimal voltage and current control (OVCC) is introduced, employing a hybrid model-data reinforcement learning (MDRL) approach for hybrid active power filters (HAPF). High steady-state accuracy and rapid dynamic response are achieved by the MDRL-based OVCC, which also maintains low sampling and computational demands. The limitations of dynamic response, inherent in traditional control methods that require significantly lower bandwidth for DC voltage control compared to AC current control, are effectively addressed. Initially, a circuit configuration and mathematical model for the HAPF are proposed. Subsequently, an MDRL-OVCC structure for optimal control is established. The training of the MDRL-OVCC is conducted using an online robust policy iteration method, and the safety of the system is ensured through a proposed robust stability analysis. Comprehensive simulation and experimental results are presented, demonstrating the superior performance of the MDRL-OVCC compared to existing state-of-the-art methods. © 1986-2012 IEEE.

关键词： Optimal control systems

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Single-Cell Electric Impedance Sensor Based on Integrated Circuit Chip

Single-Cell Electric Impedance Sensor Based on Integrated Ci...

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BioSensors Conference (BioSensors), IEEE

作者： Wenhao Hui Ren Shen Pui-In Mak Rui P. Martins Ka-Meng Lei Yanwei Jia State-Key Laboratory of Analog and Mixed-Signal VLSI Institute of Microelectronics University of Macau Macau China Faculty of Science and Technology – ECE University of Macau Macau China On Leave from Instituto Superior Técnico Universidade de Lisboa Portugal Faculty of Health Sciences University of Macau Macau China

ISBN: (数字)9798350395136

ISBN: (纸本)9798350395143

Drug screening using in-vitro primary tumor cells offers a direct approach to assessing drug sensitivity, playing a crucial role in personalized cancer diagnosis and precision medicine. However, existing tumor drug screening methods encounter a common challenge: the presence of normal cells alongside cancer cells in patient tumor samples complicates the accurate evaluation of drug effects on cancer cells alone. In this study, we introduce a real-time impedance sensing method based on an integrated circuit (IC) chip to distinguish between cancer and normal cells at the single-cell level, enabling individual analysis of their sensitivity to drugs. This innovative approach integrates impedance calculation circuits directly beneath an array of 352 single-cell-sized sensing electrodes, effectively reducing the high background noise that typically hampers the detection of ultra-weak signals. We validated this method across various cancer types, demonstrating its capability for impedance-based classification on IC chips. Our findings highlight the potential of this real-time, non-invasive, and label-free single-cell distinguishing method for precision medicine, laying the foundation for the development of ultra-miniaturized biological signal sensors and the realization of lab-on-IC technology.

关键词： Integrated circuits Drugs Precision medicine Cells (biology) Real-time systems Sensors Impedance Biosensors Cancer Tumors

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Neural signal Compression System with Spike Detection Using Compressed Sensing

Neural Signal Compression System with Spike Detection Using ...

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2023 Cross Strait Radio science and Wireless technology Conference, CSRSWTC 2023

作者： Zheng, Ruihan Xia, Yu Li, Dongming Wang, Liyang Li, Hung Chun Mak, Peng Un Vai, Mang I. Pun, Sio Hang State Key Laboratory of Analog and Mixed-Signal VLSL University of Macau Macau China Institution of Microelectronics University of Macau Macau China Jt. Lab. of Zhuhai UM Sci. and Technol. Research Institution - Lingyange Semiconductor Incorporated Zhuhai China University of Macau Faculty of Science and Technology Department of Electrical and Computer Engineering Macau China

ISBN: (纸本)9798350358971

This article aims to demonstrate a signal compression method for the wireless invasive neural recording system. A compression system with spike detection for neural signals is proposed. The input signal is firstly detected in the spike detection part and then the intercepted spike segments are sent to the compression part. A compressed sensing technique is applied in the compression part, and the Minimum Euclidean or Manhattan Distance Cluster-based (MDC) matrix is adopted for compressing neural spike segments. During simulation, the compression rate can surpass 99% and the signal-to-noise distortion ratio is around 37 dB. Moreover, the proposed method is also contrasted with the direct compression of input neural signals. When the input neural signal is directly compressed, the compression ratio is 98%, and the signal-to-noise ratio distortion rate is about 28 dB. By employing spike detection and utilizing this MDC matrix, it becomes possible to compress non-sparse spike segments in the time domain, resulting in a higher compression rate and improved reconstruction performance. © 2023 IEEE.

关键词： compressed sensing neural signal compression spike detection

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A Channel Gain Measurement Method for Magnetic Resonance Human Body Communication

A Channel Gain Measurement Method for Magnetic Resonance Hum...

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Cross Strait Quad-Regional Radio science and Wireless technology Conference (CSRWTC)

作者： Bingheng Chen Ziliang Wei Lixuan Huang Sio Hang Pun Mang I. Vai Yueming Gao College of Physics and Information Engineering Fuzhou University China The International Joint Laboratory on Health Intelligent Monitoring Systems Fuzhou University China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China Faculty of Science and Technology University of Macau China

Magnetic Resonance Coupled Human Body Communication (MR-HBC) is a promising human communication method with high efficiency and stability. Designing devices that utilize MR-HBC for communication requires accurate channel transmission characteristics for effective communication. However, MR-HBC has difficulty obtaining reliable channel gains. Due to the existence of an additional return path caused by parasitic capacitance during channel gain measurements, there are significant differences in the results of different measurement methods, and the measured channel gain does not necessarily correspond to the actual channel gain. In this regard, this paper proposes a method that can accurately measure the actual channel gain of MR-HBC. By modeling the electrical connection during the measurement of the measuring instrument, this paper shows that the additional return path between the transmitter and receiver in the experimental measurement is the reason for the discrepancy between the channel gain measurement results and the actual ones. Proposed that a balun device should be added to suppress the additional return path during the MR-HBC channel gain measurement in order to measure the realistic channel gain, and this is verified by experiments. The results show that before adding the balun, the MR-HBC channel gain measurements of different measurement methods show significant differences (maximum difference of 20.4 dB). When the additional return path is suppressed by adding the balun device, the measurement results of different measurement methods are consistent and close to the realistic measurement results measured using a small device (maximum difference of 2.5 dB). This study addresses the accuracy of measurement results during MR-HBC channel gain measurements.

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A Preliminary Study of Frequency Shift Mechanism in Magnetic Resonance Coupled Human Body Communication

A Preliminary Study of Frequency Shift Mechanism in Magnetic...

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Cross Strait Quad-Regional Radio science and Wireless technology Conference (CSRWTC)

作者： Lina Chen Jiamei Wang Ziliang Wei Sio Hang Pun Mang I. Vai Yueming Gao College of Physics and Information Engineering Fuzhou University China The International Joint Laboratory on Health Intelligent Monitoring Systems Fuzhou University China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China Faculty of Science and Technology University of Macau China

The Magnetic Resonance-Coupled Human Body Communication (MR-HBC) method presents advantages such as high path gain and enhanced information security, rendering it particularly suitable for establishing wireless body area networks. The optimal operation of MR-HBC relies on functioning at resonance frequency. However, owing to the intricate dielectric properties of human tissues and individual differences, the resonance frequency of communication systems frequently experiences varying degrees of deviation. To delve into the intrinsic mechanism behind frequency shifts, this paper establishes a finite element model based on the genuine dielectric properties and geometric structure of the human body. It investigates the augmentation effects of human tissue on MR-HBC, examines the influence of distinct tissue electrical properties on the electromagnetic field distribution of MR-HBC, and analyzes the inherent connection between frequency shifts and human tissue electrical characteristics. The results reveal that the electrical properties of human tissues stand as the primary factor affecting frequency shifts, with the extent of frequency deviation contingent upon the proportional composition of different tissues.

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An analog Front-End with Automatic Gain Control for Galvanic-Coupled Human Body Communication

An Analog Front-End with Automatic Gain Control for Galvanic...

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Cross Strait Quad-Regional Radio science and Wireless technology Conference (CSRWTC)

作者： Wenxiang Zhao Dongming Li Jiamei Wang Sio Hang Pun Mang I. Vai Yueming Gao College of Physics and Information Engineering Fuzhou University China The International Joint Laboratory on Health Intelligent Monitoring Systems Fuzhou University China State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China Faculty of Science and Technology of University of Macau China

The channel loss of galvanic-coupled human body communication (GC-HBC) is greatly affected by human body activities or individual differences, which will cause large changes in the amplitude of the input signal received by the receiver. This requires the analog front-end to have the ability to adaptively adjust the circuit gain to ensure stable output of the amplified signal. In this regard, this paper proposes an analog front-end with automatic gain control for GC-HBC. This circuit uses a differential preamplifier circuit with high input impedance and a rear-stage automatic gain control circuit that uses voltage feedback to control gain. While achieving amplification of weak signals, it also meets the requirements for stable signal output. The measurement results show that it has an input impedance of $> \mathbf{100}\mathbf{M}\mathbf{\Omega}$ , a maximum gain of 74dB, and a sensitivity of - 76dBm, effectively meeting the needs for capturing and amplifying weak signals. The loop stabilization time is $156\mu\mathrm{s}$ , and the input dynamic range is 34dB, which can ensure stable output of the amplified signal amplitude when the input signal amplitude changes.

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