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This paper describes a WiFi/BT combo SoC with integrated dual-band PAs, LNAs and T/R switches, supporting concurrent receiving for improved throughput by 30% in dense networking environment of 2.4GHz ISM band and wide-range transmitting capability (>20dB) while keeping good output power accuracy and PA power efficiency. The measured 2.4GHz/5GHz WiFi 54Mbps RX sensitivity is −78.2/−78.1dBm and Pout...
Circuit breaker (CB) installed for capacitor bank is the CB which commonly experiences the switching process due to the capacitor bank function as a voltage regulator. In closing switching process, CB encounter transient condition due to inrush current. In this paper, the simulation for studying the inrush current characteristic of capacitor bank switching in Indonesia has been performed. Simulation...
This paper proposes a new Inductive Power Transfer (IPT) transmitter configuration tolerant to displacements in the magnetic coupler and in the resonant capacitors. The new configuration uses a variable inductor in the transmitter side to regulate the power supply impedance and achieve zero voltage switch (ZVS) for different vertical and horizontal displacements in the magnetic coupler. The proposed...
This paper proposes a concept of two-terminal active capacitor implemented by power semiconductor switches and passive elements. The active capacitor has the same level of convenience as a passive one with two power terminals only. A control strategy that does not require any external feedback signal is proposed and a self-power scheme for gate drivers and the controller is applied to achieve the...
Further growth in renewable energy integration would be dependent on reliability and cost-effectiveness. These two factors can be achieved through power converter topologies that enable transformer-less connection of renewable energy based technology to the grid. This paper presents a three phase five level dual tapped inductor quasi impedance source (qZS)-nested neutral point clamped (NNPC) topology...
Harmonic and interharmonic distortions are considered as the main power quality issues especially in the distribution networks. The double-stage Adjustable Speed Drives (ASDs) in which the front-end diode rectifier is connected to a rear-end inverter through an intermediate DC-link filter may inject significant amount of harmonics and interharmonics into the grid and consequently degrade the grid...
Photovoltaic panel characterisation finds extensive use in output prediction, efficiency estimation and defect detection in photovoltaic (PV) industry. Out of the various characterisation methods available, the use of switched mode power converters is one of the most attractive solutions, owing to high speed, low power loss and additional maximum power point tracking ability. Duty ratio variation...
Single stage power factor corrected (SSPFC) AC-DC converters are attractive in particular applications because they are less expensive than conventional two-stage converters. One of the main drawbacks of SSPFC converters, however, is that their intermediate DC bus voltage varies considerably when used in universal voltage range applications. A new method for reducing the DC bus voltage variation for...
This paper introduces a single-stage isolated 48V-to-1.8V point-of-load converter based on the impedance control network (ICN) resonant converter architecture. This point-of-load ICN converter achieves large step-down while maintaining high efficiency across a wide range of input voltage and output power. Large step-down is achieved through a combination of stacked inverters, a transformer and a resonant...
Ferrite chokes are often applied to suppress electromagnetic interference (EMI) in power converters. In this paper, an improved ferrite choke RLC model and its parameters determination method are proposed. The improved ferrite choke RLC model can overcome the limitation of the existing RLC model in the low frequency band, and the proposed parameters determination method can calculate the values of...
Recently, resonant inverters have been employed to generate high voltage high frequency AC power for plasma generator of the semiconductor processing equipment. This inverter is beneficial in low switching loss owing to its natural soft-switching capability under inductive load impedance. Generally, the resonant inverter for plasma generator is designed to have inductive load using an impedance matching...
In this paper, magnetically-coupled impedance source (MCIS) three-phase four-switch inverters are introduced for renewable energy applications. This inverter utilizes two single-phase MCIS inverters to obtain a three-phase output, where less component-count is achieved in order to reduce the inverter volume. On the other hand, as a result of the reduced number of switches, the proposed inverter suffers...
This paper presents a fast-response full-wave inductor current sensor for a DC-DC converter operating in 10 MHz switching frequency. It can achieve high sensing accuracy better than 93% with inductor current varying from 100mA to 2.1 A. Also, the time response of proposed current sensor has been greatly improved and achieved < 8 ns for sensing full wave inductor current with a low transition spiking.
In this paper, a kind of networked control of power-sharing for inverter parallel operation is presented. To increase the participation of communication and improve the system performance, both autonomous mode and master-slave of communication mode in networked control are investigated. Nevertheless, communication actions may bring some unpredictable outcome due to the negative factors such as time-delay...
The power decoupling strategies of single-phase Z-source/quasi-Z-source inverter (ZSI/qZSI) to handle the inherent double-line-frequency (2ω) power are overviewed. They are categorized as passive and active power decoupling methods. The former suppresses the 2ω ripple by the impedance network, modified modulation methods, or closed-loop damping control. The latter diverts the 2ω ripple to the compensation...
This paper presents a family of cost-effective magnetically-coupled impedance source inverters for renewable energy systems. The inverters are derived from magnetically-coupled impedance source networks, featuring low cost and no ground leakage current when used in PV system. The numbers of required semi-conductor switches is reduced. More important, the elimination of leakage currents makes it particularly...
A new intelligent controlled reactor (ICR) was proposed. The reactance of ICR can be changed by a moveable magnetic-wedge, and be a large reactance when fault and lower in normal. The electromagnetic model was founded and the magnetic circuit was analyzed, then the design formula of ICR's reactance was deduced. The structure of ICR was primary designed and modeled by using ANSYS. The equivalent reactance...
The paper presents a novel filtering concept for multi-cell switch-mode power amplifiers intended to be used for high quality power sources up to the kW-region. Multi-cell switch-mode amplifiers usually are operated in interleaved PWM resulting in effective output voltage harmonics being much higher than the cell's switching frequency. This major advantage, however, is only given for ideally balanced...
DC distribution technology has become the new choice and the trending technology of shipboard power systems for its advancement over its AC counterpart. In DC shipboard power systems, the bus voltage stability is a critical issue. The presence of tightly controlled high-power constant power load can induce system-level voltage instability. To mitigate such a problem, a novel compensation method based...
In this paper, a new quasi-Y source buck-boost dc-dc converter is proposed. The proposed converter uses a quasi-Y impedance network, which consists of a three-winding transformer, or three tightly coupled inductors. The proposed converter inherits all the advantages of the original quasi-Y source dc-dc converter such as continuous input current, lack of saturation in the magnetic core of the transformer,...
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