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In order to make the buck converter obtain smaller voltage ripple and higher efficiency at the same time, the pulse skipping width modulation (PSWM) mode in buck converter application is proposed in this paper. This novel controlling mode combines the advantage of pulse skipping modulation (PSM) with improving voltage ripple especially in lighter load and pulse width modulation (PWM) having higher...
Adaptive voltage scaling (AVS) technology is gradually popularized in power management circuits to reduce power consumption of the digital load. Conventional on-chip AVS function is realized by a complex digital controller, which could cause extra consumption of the power management circuit. This paper proposes a simple AVS circuit based on dominate-pole compensation (DPC). With DPC technique, the...
Wind turbines integrated into power grids are required by specific grid codes to withstand transitory low voltage during grid faults and generate reactive power in order to maintain the system stability, which is the so-called low voltage ride through (LVRT) capability. However, considering the effect of other electrical equipment in wind farms such as transformers and power lines, the LVRT capability...
An Adaptive Voltage Scaling DC-DC Converter with Embedded Minimum Energy Point Tracking technique is presented in this paper. Three techniques, named Minimum Energy Point (MEP) Tracking (MEPT), Adaptive Voltage Scaling (AVS) and Pulse Skip Modulation (PSM), are combined in the proposed converter. The circuit is simulated in a 0.13µm standard CMOS technology, the simulation result shows that, the output...
To reduce the energy dissipation of the digital load, a minimum energy point tracking (MEPT) converter based on constant energy pulse (CEP) is proposed in this paper. Controlling the numbers of CEP, and based on slope tracking algorithm, the function of tracking the minimum energy point of the digital load can be realized. The structure of the proposed MEPT converter, the generating mechanism of the...
A high PSRR with low temperature coefficient and low noise CMOS bandgap voltage reference fabricated in 0.13-µm CMOS technology is presented in this brief. In the design, the cascade current mirror is used in the circuit, the output of the OP is used as the bias of itself and drives the next stage, and PTAT temperature compensation is realized. The simulation results, which are obtained by Hspice...
In this paper, we establish a handover model in small cell to analyze the relationship between handover failure and ping-pong rate which is characterized as a function of relevant system parameters such as time-to-trigger (TTT), UE velocity, etc. According to the model, in order to minimize the probability of ping-pong handover, we select the optimal TTT through using traversal algorithm. Simulation...
The crowbar circuit installed in the rotor side is frequently adopted by doubly-fed induction generator (DFIG) to implement low voltage ride through (LVRT) ability. Based on DFIG transient characteristic, this paper discusses the principle of choosing crowbar resistance and input lasting time from the view point of converter security, wind turbine security and wind power generation system restoring...
An automated tracking system was developed to measure the flexion-extension motion of lumbar vertebrae using the algorithm of Sequential Important Resampling Particle Filter. In vitro validity was performed in 10 samples under digitized video fluoroscopy. Each sample was taken 2 full flexion-extension cycles under a special guide device in fixed speed, while the calibration model of lumbar vertebrae...
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