An Efficient Path-Based Equivalent Circuit Model for Design, Synthesis, and Optimization of Power Distribution Networks in Multilayer Printed Circuit Boards

An automotive junction box distributes electric power to electric systems installed in a vehicle with overcurrent protection. As a larger number of electric systems are installed, the junction box is equipped with more components, functionalities and connections. However, owing to the fuse accessibility, its installation space is so restricted that a downsized design is required for the junction box. The junction box is composed of small signal circuitry for control and monitoring, and large current-carrying circuitry for power distribution which includes many parallel traces. Because of these unique features, widely used techniques for downsizing printed-circuit boards are not applicable. Also, there is no rule for designing large current-carrying parallel traces, and it is difficult to optimize the size of the printed-circuit board for the automotive junction box. This paper presents the design rules for a printed-circuit board when downsizing a junction box. First, the layout strategy for the power distribution components is presented, which is determined by the sum of the squares of the currents flowing through connector pairs. Then, the thermal effects of parallel traces are simulated for different conditions by using thermal analysis software. Based on the results, an analytical estimation of the additional temperature rises due to parallel traces and rules for a thermally effective arrangement of the parallel traces are presented.

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Investigation of Output Power and Efficiency of Wound-Rotor Brushless Doubly-Fed Machine

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.516-517.1604 ◽

2012 ◽

Vol 516-517 ◽

pp. 1604-1609

Author(s):

Jun Zhang ◽

Xue Fan Wang

Keyword(s):

Equivalent Circuit ◽

Output Power ◽

Power Distribution ◽

Equivalent Circuit Model ◽

Circuit Model ◽

Maximum Output ◽

The Core ◽

Doubly Fed ◽

Doubly Fed Machine ◽

The Relationship

Brushless Doubly-fed Machine (BDFM) is a new type of the induction machine, which has wide application in the fields of variable-speed generator and drive systems. The key factor affecting its performance is the rotor structure. In this paper, taking wound-rotor BDFM for instance, firstly, according to the relationship between the equivalent circuit parameters of the BDFM, the core equivalent circuit model of the BDFM has been derived. Secondly, based on the core equivalent circuit model and the constraints of electromagnetic load, the power distribution between the power and control windings and the constraint condition of maximum output of active power has been obtained. Thirdly, according to the simplified model of the equivalent circuit, the copper loss and the relationship between the output power and efficiency of the machine have been investigated. Finally, the anlysis results are verified by the experimental data.

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