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This paper describes an improved non-linear switching circuit (INLSC) for active rectification of voltage and reduction of ripples in the voltage waveform for the piezoelectric energy harvesting (PEH) system. The proposed converter controls the alternating current (AC) generated by the piezoelectric device (PD) under mechanical vibration. The proposed circuit combines the boost and buck-boost processes through a switching process, which functions in both positive and negative cycles. In addition, it controls the voltage and frequency of the load capacitor. In this process, the passive components in the circuit are energised by being short with the AC voltage using switching signals, which facilitates the active rectification of ultra-low AC voltage. Design considerations, theoretical analysis, simulations and experimental results are presented. It was shown that the circuit was able to control the switching signal and to convert low AC voltage (0.44 Vi) to high direct current (DC) voltage (6.5 Vdc) while achieving an output power of 469 µW which outperforms the existing similar circuits and synchronous rectifier circuit. The ripples in the rectified voltage were also comparatively less. Application-wise, the proposed circuit could power a manually connected 7-segments display, commonly used for traffic applications.

Under the background of “dual-carbon” strategy and global energy transition, the metallurgical industry, which accounts for 15–20% of industrial energy consumption, urgently needs to reduce the energy consumption and emission of DC power supply of electric furnaces. Aiming at the existing 400–800 V/≥3000 A industrial-frequency transformer-rectifier system with low efficiency, large volume, heat dissipation difficulties and other bottlenecks, this thesis proposes and realizes a high-frequency integrated DC power supply scheme for high-power electric furnaces: high-frequency transformer core and rectifier circuit are deeply integrated, which breaks through and reduces the volume of the system by more than 40%, and significantly reduces the iron consumption; multiple cores and three windings in parallel are used for the system. The topology of multiple cores and three windings in parallel enables several independent secondary stages to share the large current of 3000 A level uniformly, eliminating the local overheating and current imbalance; the combination of high-frequency rectification and phase-shift control strategy enhances the input power factor to more than 0.95 and cuts down the grid-side harmonics remarkably. The authors have completed the design of 100 kW prototype, magneto-electric joint simulation, thermal structure coupling analysis, control algorithm development and field comparison test, and the results show that the program compared with the traditional industrial-frequency system efficiency increased by 12–15%, the system temperature rise reduced by 20 K, electrode voltage increased by 10–15%, the input power of furnace increased by 12%, and the harmonic index meets the requirements of the traditional industrial-frequency system. The results show that the efficiency of this scheme is 12–15% higher than the traditional IF system, the temperature rise in the system is 20 K lower, the voltage at the electrode end is 10–15% higher, the input power of the furnace is increased by 12%, and the harmonic indexes meet the requirements of GB/T 14549, which verifies the value of the scheme for realizing high efficiency, miniaturization, and reliable DC power supply in metallurgy.

A novel 2.4 GHz high-efficiency rectifier circuit suitable for working under very-low-input electromagnetic (EM) power conditions (−20 to −10 dBm) is proposed for typical indoor power harvesting. The circuit features a SMS7630 Schottky diode in a series with a voltage booster circuit at the front end and a direct-current (DC)-pass filter at the back end. The voltage booster circuit consists of an asymmetric coupled transmission line (CTL) and a high-impedance microstrip line (of 100 Ω instead of 50 Ω) to significantly increase the potential at the diode’s input, thereby enabling the diode to operate effectively even in very-low-power environments. The experimental measurements show that the microwave direct-current (MW-DC) conversion efficiency of the rectifier circuit reaches 31.1% at a −20 dBm input power and 62.4% at a −10 dBm input power, representing a 7.4% improvement compared to that of the state of the art. Furthermore, the rectifier circuit successfully shifts the input power level corresponding to the peak rectification efficiency from 0 dBm down to −10 dBm. This design is a promising candidate for powering low-energy wireless sensors in typical indoor environments (e.g., the home or office) with low EM energy density.

With the recent development in wireless communication systems and wireless sensors, Wireless Sensor Network (WSNs) have drawn worldwide attention to control and monitor the physical environment away from places that could be dangerous or challenging to access. The sensor nodes have no power supply. Therefore, the energy harvesting technique is a key solution that has shown good potential instead of their battery dependency. This paper presents a design and simulation of an efficient RF energy harvesting rectifier circuit for powering WSNs nodes. The single and multi-stages of the voltage doubler rectifier (VDR) circuit based on HSMS 2860 Schottky barrier diode (SBDs) has been simulated using layout and investigated at the operating frequency of 5.8 GHz using ADS software. The simulated results achieve a good performance at the optimum load (RL) of 2.2k. The conversion efficiency and DC output voltage of single stage VDR are about 74% and 3.85 V respectively at the RF input power of 20dBm. Finally, the simulation results of the proposed circuit have been obtained using layout EM Co-Simulation, lumped element LC, and Microstrip transmission line MTL are better matched.

Miniaturized mobile electronic devices have aroused great attention due to their convenience to daily life. However, they still face a problem that power supply from the conventional cell needs to be regularly charged or replaced. Portable electricity supply collecting energy from environment is highly desired. Herein, a highly flexible and stretchable Miura folding based triboelectric nanogenerator (MF-TENG) is prepared by using flexible polyethylene terephthalate (PET) as a folding substrate with a double working side design, specifically one side as the main TENG (M-TENG) and other side as the excitation TENG (E-TENG). The E-TENG supplements charge to M-TENG by a half-wave rectifier circuit. This design increases the TENG working area and reduces its volume. The output performance of the TENG based on Miura folding with charge excitation called MF-CE-TENG is greatly boosted. The optimal output charge and maximum peak power of MF-CE-TENG achieves 1.54 µC and 5.17 mW at 1 Hz, respectively, which is 4.61 and 10.55 times as much as that of MF-TENG without charge excitation. To demonstrate its applications, the MF-CE-TENG is used to light up 456 LEDs brightly and charge a 100 µF capacitor to 6.07 V in 5 min. A calculator and a temperature-humidity sensor work normally powered by MF-CE-TENG with an energy management module. This work provides a new strategy to enhance the output energy of Miura folding TENG by applying a charge excitation mode for the first time, which might be an effective approach to be used in other TENGs.

Recently, there has been an increasing fascination for employing radio frequency (RF) energy harvesting techniques to energize various low-power devices by harnessing the ambient RF energy in the surroundings. This work outlines a novel advancement in RF energy harvesting (RFEH) technology, intending to power portable gadgets with minimal operating power demands. A high-gain receiver microstrip patch antenna was designed and tested to capture ambient RF residue, operating at 2450 MHz. Similarly, a two-stage Dickson voltage booster was developed and employed with the RFEH to transform the received RF signals into useful DC voltage signals. Additionally, an LC series circuit was utilized to ensure impedance matching between the antenna and rectifier, facilitating the extraction of maximum power from the developed prototype. The findings indicate that the developed rectifier attained a peak power conversion efficiency (PCE) of 64% when operating at an input power level of 0 dBm. During experimentation, the voltage booster demonstrated its capability to rectify a minimum input AC signal of only 50 mV, yielding a corresponding 180 mV output DC signal. Moreover, the maximum power of 4.60 µW was achieved when subjected to an input AC signal of 1500 mV with a load resistance of 470 kΩ. Finally, the devised RFEH was also tested in an open environment, receiving signals from Wi-Fi modems positioned at varying distances for evaluation.

This article proposes an interleaved DC–DC boost architecture with a voltage multiplier rectifier circuit to achieve superior performance. The design methodology and operational characteristics of the converter are examined for two defined duty cycle intervals: Area 1 (0 <  D < 1) and Area 2 (0.5 ≤  D < 1). With its flexible functionality, the converter proves suitable for a wide range of applications, including energy storage platforms, electric transportation, and renewable energy technologies. The suggested converter has two essential levels: an interleaved boost level and a voltage multiplier rectifier (VMR) circuit. The interleaved boost level functions as a two-phase boost converter, converting the input DC voltage into a high-frequency AC square wave to enable efficient filtering with small capacitors. The VMR phase then converts the AC waveform to produce a high DC output voltage. The proposed converter delivers high voltage gain with reduced input ripple through interleaved operation, which improves electromagnetic interference (EMI) performance and extends the source’s lifespan. Its transformerless design, combined with a voltage multiplier, minimizes both size and cost while maintaining high efficiency. Additionally, the low stress on switches allows for the use of more affordable components, making it an ideal solution for renewable energy and DC microgrid applications. This study examines the operational states of the converter, its steady-state behavior, Voltage gain characteristics across idealized and non-ideal conditions, power losses, and efficiency metrics. Under 100 W output power conditions, the suggested converter demonstrates a maximum efficiency of 96%. To validate the accuracy of the theoretical analysis and simulation results, the converter is subjected to simulations for a voltage conversion from 25 V to 270.5 V, which leads to the development of a laboratory prototype for empirical validation. The results of the simulation and experimental tests confirm the accuracy and reliability of the suggested interleaved boost converter’s performance.

Due to technological discoveries in power generation or other power sources, DC-DC converters have developed more practical uses in electrical generation technologies (especially in DC micro grids). Separate the conversion components and generation of an optimized separate predictive algorithm may be achievable through model parameters. The primary goal of implementing an electronic parts converter for grid connection is to provide an amount of energy statistically and quantitatively satisfactory for the many applications at hand. Load frequency control electronics are divided into transistors, DC-to-DC converts, and rectifier diodes. The adapter from DC - DC is frequently used even among the many. The proposed technique can be applied to other parameter verification and improvement conditions, such as rectifier circuits, filter power supplies, etc.

The unique features of ambipolar two-dimensional materials open up a great opportunity to build gate-programmable devices for reconfigurable circuit applications, e.g., PN junctions for rectifier circuits. However, current-reported rectifier circuits usually consist of one gate-programmable PN junction as the rectifier and one resistor as the load, which are not conductive to voltage output and large-scale integration. Here we propose an approach of complementary gate-programmable PN junctions to assemble reconfigurable rectifier circuit, which include two symmetric back-to-back black phosphorus (BP)/hexagonal boron nitride (h-BN)/graphene heterostructured semi-gate field-effect transistors (FETs) and perform complementary NP and PN junction like complementary metal-oxide-semiconductor (CMOS) circuit. The investigation exhibits that the circuit can effectively reconfigure the circuit with/without rectifying ability, and can process alternating current (AC) signals with the frequency prior 1 KHz and reconfiguration speed up to 25 µs. We also achieve the reconfigurable rectifier circuit memory via complementary semi-floating gate FETs configuration. The complementary configuration here should be of low output impedance and low static power consumption, being beneficial for effective voltage output and large-scale integration.