http://WWW.FINALYEARPROJECTS.NET
http://WWW.FINALYEARPROJECTS.NET

Checking delivery availability...

background-sm
Search
3

Updates found with 'capacitors'

Page  1 1

Updates found with 'capacitors'

VLSI PROJECTS ABSTRACT 2016-2017 A FULLY DIGITAL FRONT-END ARCHITECTURE FOR ECG ACQUISITION SYSTEM WITH 0.5 V SUPPLY ABSTRACT: This paper presents a new power-efficient electrocardiogram acquisition system that uses a fully digital architecture to reduce the power consumption and chip area. The proposed architecture is compatible with digital CMOS technology and is capable of operating with a low supply voltage of 0.5 V. In this architecture, no analog block, e.g., low-noise amplifier (LNA), and filters, and no passive elements, such as ac coupling capacitors, are used. A moving average voltage-to time converter is used, which behaves instead of the LNA and anti-aliasing filter. A digital feedback loop is employed to cancel the impact of the dc offset on the circuit, which eliminates the need for coupling capacitors. The proposed architecture of this paper analysis the logic size, area and power consumption using Xilinx 14.2. EXISTING SYSTEM A digital signal processor then processes the digital data for monitoring or diagnosis applications. Biomedical signal acquisition systems typically consist of a low-noise amplifier (LNA), a bandpass filter, an analog sample-and-hold, and an analog-to-digital converter (ADC), as shown in Fig. 1(a). While the architecture shown in Fig. 1(a) is typically used, in some cases chopping technique is used to reduce the impact of the flicker noise, as shown in Fig. 1(b). PROPOSED SYSTEM: Fig. 3(a) shows the block diagram of the proposed fully digital architecture. In this structure, the processing of the bio-signal is performed in the time and digital domain. Hence, the advantages of digital CMOS technology are utilized. The analog bio-signal coming from the electrode is directly connected to the front-end circuit and is converted to time with a voltage-to-time converter (VTC). From this point on in the circuit, the signal information is in the phase of the VTC output signal. The output of the VTC is applied to the time-mode processing block, in which the anti-aliasing and offset cancellation are done in time domain. Then, a time-to-digital converter (TDC) transfers the time-mode signal into digital domain where other processes (digital filtering, data compression/reduction and so on) are performed. ADVANTAGES:• Compact • Low power consumption DISADVANTAGES:• Power consumption is high• Coverage area is high SOFTWARE IMPLEMENTATION• Modelsim• Xilinx ISE
Send Enquiry
Read More
IEEE 2016 POWER SYSTEM PROJECTS ABSTRACTREACTIVE POWER AND AC VOLTAGE CONTROL OF LCC HVDC SYSTEM WITH CONTROLLABLE CAPACITORS ABSTRACT: It is well-known that traditional LCC HVDC system is not able to control its reactive power and terminal AC voltages. This paper investigates the reactive power and AC voltage control at the inverter side of the LCC HVDC system with controllable capacitors. The system’s ability of operating under negative extinction angle is utilized to achieve a wide range of reactive power control and, in particular, the ability of exporting reactive power. In connection with the inverter AC terminal voltage or reactive power control, among different control possibilities at the rectifier side, active power control is desirable since large variations of active power transfer is very unfavorable. Detailed theoretical analysis is carried out first to show the reactive power controllability, and the capacitor voltage level is selected based on the desired control range. In addition, a new extinction angle measurement approach is proposed for negative extinction angle measurements. The effectiveness of the reactive power/voltage control capability for the proposed system is validated through simulation results using Real Time Digital Simulator (RTDS). To verify the effectiveness of the reactive power and voltage control, CCC HVDC and LCC HVDC with SVC are also set up in RTDS, and simulation comparisons are made. Furthermore, contribution to AC voltage control in power system using the proposed method is demonstrated through simulation results on the modified two-area four-machine AC power system.
Send Enquiry
Read More
POWER ELECTRONICS ABSTRACT 2016-2017 A LOW CAPACITANCE CASCADED H-BRIDGE MULTI-LEVEL STAT COM ABSTRACT:This paper introduces a cascaded H-bridge multilevel converter (CHB-MC) based Stat Com system that is able to operate with extremely low dc capacitance values. The theoretical limit is calculated for the maximum capacitor voltage ripple, and hence minimum dc capacitance values that can be used in the converter. The proposed low-capacitance Stat Com (LC-Stat Com) is able to operate with large capacitor voltage ripples, which are very close to the calculated theoretical maximum voltage ripple. The maximum voltage stress on the semiconductors in the LC-Stat Com is lower than in a conventional Stat Com system. The variable cluster voltage magnitude in the LC-Stat Com system drops well below the maximum grid voltage, which allows a fixed maximum voltage on the individual capacitors. It is demonstrated that the proposed LC-Stat Com has an asymmetric V-I characteristic, which is especially suited for operation as a reactive power source within the capacitive region. A high-bandwidth control system is designed for the proposed Stat Com to provide control of the capacitor voltages during highly dynamic transient events. The proposed LC-Stat Com system is experimentally verified on a low-voltage 7-level CHB-MC prototype. The experimental results show successful operation of the system with ripples as high as90% of the nominal dc voltage. The required energy storage for the LC-Stat Com system shows significant reduction compared to a conventional Stat Com design.
Send Enquiry
Read More
VLSI PROJECTS ABSTRACT 2016-2017 IMPLEMENTING MINIMUM-ENERGY-POINT SYSTEMS WITH ADAPTIVE LOGIC ABSTRACT: Timing-error-detection (TED)-based systems have been shown to reduce power consumption or increase yield due to reduced margins. This paper shows that the increased adaptability can be a great advantage in the system design in addition to the well-known mitigated susceptibility to ambient and internal variations. Specifically, the design tolerances of the power management are relaxed to enable even greater system-level energy savings than what can be achieved in the logic alone. In addition, the system is simultaneously able to operate near the minimum error point. Here, the power management is a simplified dc–dc converter and the TED is based on time borrowing. The target application is a single-chip system on chip without external discrete components; thus, switched capacitors are used for the dc–dc. The proposed architecture of this paper analysis the logic size, area and power consumption using Xilinx 14.2.EXISTING SYSTEM: Furthermore, the energy consumption of transmitting a bit across a given distance does not scale with Moore’s law as advantageously as the digital processing within a ubiquitous wireless node. Therefore, the energy cost of wireless transmission will proportionally grow when compared with digital processing. Increasing the energy efficiency thus requires increasing the amount of intranode processing to minimize the wireless transmission of data. The processor and the digital signal processor will thus become one of the, if not the, most important parts to be optimized. This will be compounded by the increasing functionalities within the node (video compression and analysis, machine learning, etc.). Ideally, the logic of IoT devices would operate at their minimum energy point (MEP). PROPOSED SYSTEM: For digital static CMOS logic, when the performance constraints allow, the straightforward solution to energy frugality is to lower the operating voltage, all the way to the MEP. The MEP has been proven to exist around 0.2–0.4 V depending on various factors. For process nodes down to 45 nm, this is in the subthreshold operation region and for smaller process nodes, in the near-threshold region. ADVANTAGES:• EDP is reduced• Reduce the power consumption DISADVANTAGES:• EDP is high• Power consumption is high SOFTWARE IMPLEMENTATION:• Modelsim• Xilinx ISE
Send Enquiry
Read More
IEEE 2016 EMBEDDED PROJECTS ABSTRACTUR-SOLARCAP: AN OPEN SOURCE INTELLIGENT AUTO-WAKEUP SOLAR ENERGY HARVESTING SYSTEM FOR SUPERCAPACITOR BASED ENERGY BUFFERING ABSTRACT: Energy harvesting systems that couple solar panels with super capacitor buffers offer an attractive option for powering computational systems deployed in “field settings, ” where power infrastructure is inaccessible. Super capacitors offer a particularly compelling advantage over electrochemical batteries for such settings because of their ability to survive many more charge-discharge cycles. We share UR-Solar Cap – a versatile open source design for such a harvesting system that targets embedded system applications requiring power in the 1–10 W range. Our system is designed for high efficiency and controllability and, importantly, supports auto-wakeup from a state of complete energy depletion. This paper summarizes our design methodology, and the rationale behind our design and configuration decisions. Results from the operation and testing of a system realized with our design demonstrate: (a) an achievable harvester efficiency of85%, (b) the ability to maintain sustained operation over a two week period when the solar panel and buffer are sized appropriately, and (c) a robust auto-wakeup functionality that resumes system operation upon availability of harvestable energy after a period in which the system has been forced into a dormant state because of a lack of usable energy. To facilitate the use of the system by researchers exploring embedded system applications in environments that lack a power infrastructure, our designs are available for download as an archive containing design schematics, PCB files, firmware code, and a component list for assembly of the system. Additionally, a limited number of pre-assembled kits are available upon request.
Send Enquiry
Read More
Page 1 1