A multiple-input switched-capacitor DC-DC converter which can realize long battery runtime is proposed in this letter. Unlike conventional converters for a back-lighting application, the proposed converter drives some LEDs by converting energy from solar cells. Furthermore, the proposed converter can charge a lithium battery when an output load is light. The validity of circuit design is confirmed by theoretical analyses, simulations, and experiments. key words: DC-DC converters, switched-capacitor circuits, back-lighting applications, clean energy * MAX1910 and MAX1912 are 1.5 × /2× step-up converters produced by Maxim Integrated Products.
This paper presents a technique to control the inventory level on the warehouse automation by using continuous reviewing and forecasting system. The product demand that stored in the warehouse depends on orders from customers. For each product, the demand follows a Poisson process and the delivery lead-time is known. The demand forecast can predict the trend of order and redefine the reorder point (RP) of inventory that linked to automatic warehouse control system. The automatic warehouse plays an important role in the computer integration manufacturing system (CIMS). The functions of CIMS include production planning, material requirement planning, work order generation, process control, quality control, shipping planning, warehouse and inventory management and material cost accounting. [1] This paper focuses on implementing an automatic warehouse control and inventory management demand forecasting system.
This paper presents the designing of the digital controller compare with analog controller for Inverted Pendulum System. The digital controller that presented is discrete optimal H 2 controller by discretizing plant then applied it with digital controller design technique, as DLQR, DLQE and DLQG follow state-space approach including addition of the quadratic derivatives of state variables term in the usual standard performance index for Linear Quadratic Gaussian optimal control as an extra weighting function to play the role in swing suppressor. The results revealed that the swing of the Pendulum's angle can be decreased at numerous requirements with excellence. How to select the suitable weights for control is also suggested.
This paper presents a design technique for the two degree of freedom (2-DOF) control system using PID (Proportional-Integral-Derivative) x (n-2) stage PD as a cascade controller for the nfh order plant. It is intended to satisfy both transient and steady state response specifications based on the root locus approach. This controller can be used instead of a conventional PID controller to obtain better performance without relying upon any tuning methods. The overall system is approximated as a stable and robust second order system. The cascade controller gain can be adjusted to meet faster responses with a little or no overshoot. The simulation results show that the desired performances are achieved. The merit of this approach for the plant with uncertain parameters is also shown.
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