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As the device size shrinks beyond 45nm technology node, logic BEOL (back end of line) started adopting Cu/Ultra low k (ULK) to reduce RC delay. With the introduction of low k material, IMD TDDB is notably degraded as numerous publications reported. The impact of ULK material deposition process, barrier layer deposition process on TDDB performance were investigated and discussed in-depth in this paper...
Dynamic response of boost power factor correction (PFC) converter operating in continuous-conduction mode (CCM) is heavily influenced by low-bandwidth of voltage control loop. A novel tri-state boost PFC converter operating in pseudo-continuous-conduction mode (PCCM) is proposed in this paper. An additional degree of control-freedom introduced by a freewheeling switching control interval helps to...
Online evaluation of battery state of function (SOF) is crucial for battery management systems of autonomous mobile robots. Battery State of Charge (SOC) represents its remaining energy available, whereas internal resistance and capacity reflect its state of health (SOH). In this paper, an improved equivalent circuit model is proposed to estimate SOC, internal resistance and capacity using an unscented...
This paper deals with specific problems encountered when full digital control is applied for the boost-type power factor correction (PFC) converter. The robust performance, voltage regulation and sample frequency of the proposed controller are highlighted. Compared with traditional design, a novel input voltage feed-forward control algorithm is proposed to reduce the closed-loop time constant and...
In this paper, a battery state of charge (SOC) estimation method based on the extended Kalman filter is proposed. In some known battery SOC estimation methods, it is assumed that the relationship between battery open circuit voltage and SOC is linear and static. However, this relationship is only piece wisely linear in practice and varies with the ambient temperature, as assumed in this work. The...
In this paper, a simplified battery model and a closed-loop estimation method of the state of charge (SOC) are proposed. The simplified battery model consists only of two resistors and two capacitors, based on which a sliding mode observer is designed to compensate modeling errors when the SOC is estimated. The proposed method can overcome the drawbacks of the conventional SOC estimation methods,...
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