Abstract: A transformer structure, configured with an assembly of overlapped plural of laminations, a roller and a coil, to provide a transformer with better function of permeability, less weight, lower cost, higher coupling efficiency of electrical energy, and a rapid winding process which could be applied in a variety types of transformer structure or similar products.

Abstract: A circuit structure of light-emitting diode (LED) lamp includes a combination of at least one LED lamp assembly, a current-limit resistor, a bridge rectifier, a capacitor set, a circuit board, and an electrical connector, by which each LED of at least one LED lamp assembly is at one end in series with a serially-connected resistor individually and then each serial-connected by-pass resistor is in parallel with the former-mentioned electrical structure to form a LED lamp assembly. The present invention provides a better solution which conventional LED lamp cannot be configured with a high voltage power supply. Further, the hardware lay-out of the circuit structure allows for direct connection with an external power source of AC 100-380V, which is fed through the bridge rectifier for regulation and conversion into direct current to be directly coupled to and used by the LED lamp assembly without a voltage-down transformer.