Patent ID: 8803651

Claim:
A low-profile transformer, comprising: a core unit having a pair of opposingly arranged base portions, an inserting portion, and a pair of opposingly arranged lateral portions, wherein the inserting portion has a long axis, the inserting portion and the lateral portion extend from the base portion substantially along the long axis, wherein the top-facing edge of the lateral portions is chamfered, wherein the lateral portion is spaced from the inserting portion, defining a pair of coil winding space there-between for passing coils; and at least a primary coil and a secondary coil wound around the inserting portion, wherein the primary coil has a primary coil winding number (N p ) while the secondary coil has a secondary coil winding number (N s ), the ratio of N p and N s defines a coil winding ratio (N), wherein the N p and N selectively satisfy the solution space of a characteristic effective area function A e (N p , N) and a characteristic magnetic flux variation function ΔB(N p , N), which are provided by applying predetermined operational and material specifications to a characteristic equation: A e = V in_min ⁢ D ⁡ ( V in_min , N , V o ) N p ⁢ Δ ⁢ ⁢ B · fre wherein A e denotes an effective cross-sectional area of an inserting portion, V in — min denotes minimum AC (alternating current) input voltage in [V], N denotes winding ratio between primary and secondary windings, V o denotes DC output voltage in [V], D (V in — min , N, V o ) denotes duty cycle, wherein D 1 - D = N ⁢ V 0 V in_min , Np denotes primary winding number, ΔB denotes change in magnetic flux density in [Tesla], fre denotes operating frequency in [KHz].