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According to the welding current and electrode voltage detected in resistance spot welding, the dynamic resistance was calculated and the nugget growing thermo-effect in process of nugget forming was studied. The results showed that the process of nugget growth in resistance spot welding can be divided into three stages, which were initial stage, growing stage and stable stage. The welding current...
The spatial and temporal non-uniform power of the microprocessor components endangers its functionality and reliability. The rapid change in dynamic power affects electric circuitry, leads to electron migration and high leakage currents; all of which contribute to localized hot spots and high thermal stresses. Though, the dynamic thermal management techniques (DTM) keep the chip temperature within...
The power dissipation in a microprocessor is spatially and temporally non-uniform resulting in hot spots, high temperature gradients and as a consequence, high thermal stresses. This temperature non-uniformity and existence of hotspots in the processor poses a threat to the performance and reliability of the processor in the long run. The dynamic thermal management (DTM) techniques applied at the...
It installed the monitoring devices with a certain distance in the 35KV line to determine accurately the fault location in this paper, the load units were grounded with taking into account the actual operating conditions of load by the ATP simulation. It found that the transient power waveforms of healthy section were very similar in the same side of fault point by the simulation, while the similarity...
This paper presents an averaged model and a small-signal model of a bidirectional dual active bridge (DAB) DC-DC converter. Based on the proposed model, the stability and transient power flow in the system can be analyzed. A novel hybrid controller is proposed for the phase-shift based feed-back and feed-forward control of a 600V/10kW prototype. The hybrid controller can ease the difficulties of the...
The demand for powerful computational machines using scaled technologies has brought power dissipation to the forefront. Hence there is a need to accurate model power dissipation in high speed VLSI chips. The power consumption of interconnects has become an important issue as technology scales down. Therefore efficient power modeling of interconnects are necessary where inductance effect is dominant...
Supercapacitors can provide the transient power that the cranking need in low temperature. Aiming to reduce the volume of lead acid battery and the cost of the power system, supercapacitor and lead acid battery hybrid systems are investigated as power sources for diesel engine cold starting by using cold starting test and road test. This paper focuses on the requirement of capacitance and effective...
In this paper, we present a new approach to identify transient power quality disturbances using linear combiners and a fuzzy decision support system. The key idea underlying the approach is to obtain the amplitude and the slope of the peak fundamental component of a voltage waveform using adaptive linear combiners, along with nonlinear least mean squares (LMS) algorithm. Fuzzy logic is then used to...
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