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Machines in electric vehicles are driven by switching power electronic devices and undergo variable load cycling. In transient conditions high currents and temperatures develop, forcing the electric motor and particularly the insulation materials to undergo severe multi-stress. Insulation degradation will progressively lead to short-circuits which are harmful for the traction motor, vehicle safety...
Aluminum electrolytic capacitors (AECs) are widely used in power electronic converters for filtering, buffering, bypass and storage purpose. Typical service life of AECs varies between 1,000 to 12,000 hours at rated condition. Operational life of these capacitor decreases due to various electrical and environmental parameters, thereby limiting the life of the converter system. Typically, capacitors...
Small PV system installed on the roof of Faculty of Electrical Engineering and Information Technology building in Bratislava has been monitored during three years and its parameters determined. After three years of operation time the changes in photovoltaic module properties have been evaluated by means of various electrical measurements and ageing process estimated using the capacitance, dissipation...
Negative bias temperature instability (NBTI) in MOS capacitors has been investigated using a novel NBTI measurement method, named two-point capacitance-voltage (TPCV). This method is based on C-V techniques and allows one to independently separate the interface (ΔNit) and oxide traps (ΔNot) induced by NBTI. For the first time, to our knowledge, such a method is proposed. The TPCV method permits a...
This paper discusses experimental setups for health monitoring and prognostics of electrolytic capacitors under nominal operation and accelerated aging conditions. Electrolytic capacitors have higher failure rates than other components in electronic systems like power drives, power converters etc. Our current work focuses on developing first-principles-based degradation models for electrolytic capacitors...
RF reliability is becoming an increasing concern for actual technology platforms. In this context, small signal equivalent circuit degradation under hot carrier stress is investigated. It is shown that some lumped elements such as the conductance, the transconductance, the gate-to-drain capacitance, and series resistances are degraded. The application of corrections based on physical phenomenon explains...
This paper proposes the experiments and setups for studying diagnosis and prognosis of electrolytic capacitors in DC-DC power converters. Electrolytic capacitors and power MOS-FET's have higher failure rates than other components in DC-DC converter systems. Currently, our work focuses on experimental analysis and modeling electrolytic capacitors degradation and its effects on the output of DC-DC converter...
Class D amplifiers are becoming the most feasible solution for embedded audio application. However, distortions due to the non-linear nature of switching stage are the main drawback for this amplifier topology. This paper discusses the design and implementation of high fidelity audio class D using sliding mode control scheme. This design method proves to be a cost effective solution for industrial...
Since the very beginning of the flash memory era, the market has been dominated by the floating gate technology. However, as floating gate flash continues along a very steep scaling path, more and more barriers start to appear, limiting further scaling possibilities of the technology. At the same time, other concepts are preparing to take over. This paper concentrates on the prospect of high-k materials...
A new sensorless technique for monitoring the condition of inverter dc link aluminum electrolytic capacitors based on equivalent series resistance, ESR, and capacitance, C, estimation is proposed in this paper. The main concept of the proposed method is to estimate ESR and C of the capacitor using the inverter whenever the motor is stopped. The parameters are estimated from the dc link voltage and...
A 53 dB gain limiting amplifier for OC-192 and 10 GbE applications is developed in a 50 GHz fT SiGe SOI complimentary bipolar process, and has 5 mV pk-pk sensitivity, 1.25 V pk-pk maximum input signal, 14 ps (20/80%) rise/fall times and 450 mV pk-pk output into matched differential 50 Ohm loads, consuming 430 mW on a 3.3 V supply. Input Cherry-Hooper gain stages limit the -3 dB bandwidth to 11 GHz...
The principal cause of degradation in polyethylene exposed to the normal atmosphere is oxidation [1–2], thought to proceed via a free radical mechanism involving hydroperoxide intermediates. The final oxidation products are probably present mainly in the form of carbonyl groups. One of the manifestations of degradation in polyethylene is a rise in dielectric loss factor (dissipation or conductance)...
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