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Energy Storage
Published in Denise Wilson, Wearable Solar Cell Systems, 2019
The basic boost converter design, while simple, easy to implement, and low cost, has some disadvantages. A large capacitor is needed at the output to keep the output voltage stable and the ripple (i.e., periodic change) in the output current is significant. Furthermore, in conventional solar installations, where output voltages tend to be high, the basic boost converter design puts a large voltage stress on the MOSFET switch. While this last concern is minimal for the lower output voltage designs of wearable solar cell systems, a large ripple current can compromise optimal battery charging and a larger capacitor can increase cost and size of the overall solar cell system. An interleaved boost converter (Babba et al. 2018) can reduce the ripple on output power and current by using two boost converters operating out of phase with one another. This interleaved approach allows the output voltage to be charged for a longer period of time over each clock cycle, thus giving it less time to discharge. Lower discharge times also allow for a smaller capacitor to be used at the output of the boost converter. Other boost converter designs, that include isolation (of the output from the input), enhanced interleaved designs, and push-pull approaches (Li and He 2010; Babba et al. 2018), and address problems associated with high-power output demands and are less relevant to wearable applications.
Tera Sample-per-Second Time Stretched Analog-to-Digital Conversion
Published in Chi H. Lee, Microwave Photonics, 2017
Bahram Jalali, Ali M. Fard, Yan Han
To capture a continuous-time input signal, a multichannel time-stretch system is required. This architecture overcomes the TBP limitation detailed earlier. In principle, however, it can suffer from inter-channel mismatch problems that degrade the performance of conventional sample-interleaved converters. However, there exists a fundamental difference between a parallel TS array and a sample-interleaved converter array. In the latter, the signal in each channel is sampled at a fraction of the required Nyquist rate, whereas in the former, it is sampled at, or above, the Nyquist rate. This permits an effective on-line calibration of the mismatch errors.
An analysis of the influence of affordable housing system on price
Published in Dawei Zheng, Industrial, Mechanical and Manufacturing Science, 2015
The interleaving technique consists of phase shifting the control signals of 3 converter cells in parallel, operating at the same switching frequency [8]. A phase shift of 2π/3 from each other is used for the control signals to achieve interleaving algorithm. As a consequence, the interleaved bi-directional converters exhibit both lower current ripple and voltage ripple.
Characteristic Analysis of Cascading-Combination DC/DC Controlled-Source Circuit for Marine Electromagnetic Transmitter
Published in Electric Power Components and Systems, 2023
Haijun Tao, Zheng Zheng, Lina Guo
As conditional DC/DC controlled-source circuit can’t solve high-voltage transmission problem of marine electromagnetic transmitter, a cascading-combination DC/DC controlled-source circuit is introduced in this paper, operating process of the circuit is analyzed, large-signal and small-signal mathematical models are established, voltage sharing characteristics under control mode of common duty ratio are analyzed. Interleave control can significantly reduce the output current ripple, and reduce the volume of filter inductance and filter capacitor.With common duty ratio control, even if the parameters of the two modules are inconsistent, the effect of input voltage sharing and output current sharing can also be achieved.
Design and analysis of isolated high step-up Y-source DC/DC resonant converter for photovoltaic applications
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2023
Harinaik Sugali, Shelas Sathyan
In order to meet the safety regulations in a grid-connected PV system, isolated converters are needed (Zaoskoufis and Tatakis 2021). Adding a high-frequency transformer (HFT) can increase the converter’s power density at a lower cost. In isolated converters, a high turn ratio in the transformer yields higher voltage gain. However, adding a higher number of turns causes increases in parasitic capacitance and inductance, which result in a significant voltage spike (Kim et al. 2021). The current ripple at the input side is another significant concern in the PV system and it will impact on the converter performance (Elkhateb et al. 2014). Interleaved topologies reduce the current ripple and improve power handling capacity (Ye et al. 2020). The current-fed converters have inherent shoot-through (ST) protection, high gain, and minimal current ripple at the input side. As a result, it requires a lower number of turns in the HFT. Nevertheless, semiconductor devices in current-fed converters experience high-voltage spikes at turning off instants (Prasanna, Rathore, and Mazumder 2013). Hence, traditional resistor-capacitor-diode (RCD) snubbers have been used to reduce these voltage spikes (Tibola et al. 2017). Most of the converters mentioned above operate with limited switching frequency since they are hard switched. In (Sathyan et al. 2015), soft-switching (zero voltage switching (ZVS)) was implemented using an active clamp technique for better conversion efficiency. However, active clamp circuits result in enormous current stress on the components, increased cost, duty cycle loss, and circuit complexity.
Enhanced Power Output from the PV with Low Input Ripple DC-DC Converter
Published in Electric Power Components and Systems, 2018
Chandrasekar Venkatesan, Chakkarapani Manickam, Maddikara Jaya Bharata Reddy, Saravana Ilango Ganesan, Nagamani Chilakapati
Hence, there is a need to reduce the ripple around the MPP, at the same time preserving the lifetime of the entire PV system. Interleaved converters are an appropriate solution to attain both of these objectives. By selectively controlling the duty cycle, the current drawn from the input side of the converter can be made practically ripple free. The prime achievement of interleaved converters in reducing the input current ripple helps in reducing the input filter requirements. Thus, a film capacitor of smaller value is sufficient to suppress the injected voltage ripple into PV and this in-turn also enhances the life of the converter.