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Flat Transformer Advantages |
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Current Sharing The Flat Transformer, typically, has a number of parallel single turn secondary windings. Each secondary winding is coupled to the same primary winding. Therefore, the current in each secondary winding is equal to the ampere-turns in the primary winding (neglecting magnetization current), and to each other. This characteristic is particularly advantageous where parallel rectifiers are used. The windings share the current equally, with no need for ballast resistors or other added components. Very High Current Densities The Flat Transformer design incorporates excellent thermal characteristics. Because of these characteristics, very high current densities in a very small package can be achieved. High Efficiency Very high efficiencies are achieved by controlling the leakage inductance which allows for faster switching times and lower cross-over losses. The transformer design typically uses few turns on both the secondary and primary windings which result in lower winding losses. The geometry of the core has a unique shape which reduces the core losses. Low Leakage Inductance Excellent coupling between the windings, and the absence of multiple turns on both windings keep the leakage inductance to a minimum. Terminations to the ancillary components are kept very short and tight, for minimal leakage inductance in the interconnecting wiring. Excellent High Frequency Characteristics The penalty for higher frequency operation has, heretofore, been increased switching losses and overheated transformers. The flat transformer technology solves theses problems and offers an economical modular approach to high frequency transformer design. |
High Power Density Because of the small size of the elements, and their excellent thermal dissipation, the flat transformer can be tightly packaged with its associated semiconductors and inductor yielding very high power densities. Low Cost The entire transformer module consists of a few relatively inexpensive parts. The simplicity of the design together with the ease of assembly result in an extremely low cost component compared to conventional equivalents. Cost Savings in Ancillary Components With lower leakage inductance and lower switching losses, the stresses on the associated components are reduced enabling the use of components with lower power rating and, therefore, lower cost. Excellent Heat dissipation The elements of the flat transformer are small with a high surface to volume ratio and with very short thermal paths. Typically, there are very few turns on both the primary and secondary windings. The unique geometry of the cores results in lower core losses and superior heat dissipation so that higher flux densities can be attained. Simple Construction Using a few parts with minimal windings, the entire module lends itself to automated assembly. Low Profile The cores used in the flat transformer are very small, and can be arranged on a flat surface. Unit profile ranges from 8 mm (0.3") to 25 mm (0.6"). High Dielectric Isolation The flat transformer is easily insulated with the required thickness and layers of insulation and creepage distance necessary to meet agency requirements for dielectric isolation, without measurable degradation in performance. |
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© 2000, 2001 Flat Transformer Technology Corp.
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