2results about How to "Solve the low conversion efficiency" patented technology

This invention relates to the field of electrical technology, and more particularly to a flyback switching power supply absorption circuit, a transformer leakage inductance absorption method, and a chip. The circuit includes: a transformer comprising a primary winding NP and a secondary winding NS; a primary sub-circuit comprising an energy storage branch connected to the primary winding NP and an absorption branch connected to the primary winding NP, wherein when the energy storage branch is on, the primary winding NP stores energy, and when the absorption branch is on, it absorbs the leakage inductance energy of the transformer; and a secondary sub-circuit connected to the secondary winding NS, wherein when the secondary winding NS is on, it provides an output voltage VOUT to the load connected to the secondary winding NS. This invention can solve the problem of low power conversion efficiency. By absorbing leakage inductance energy through the absorption branch for use by the load connected to the secondary sub-circuit, the power conversion efficiency can be improved.

The planar transformer capable of reducing the leakage inductance of the transformer comprises a magnetic core, a plurality of groups of primary coils and a plurality of groups of secondary coils, the plurality of groups of primary coils and the plurality of groups of secondary coils are sleeved on a magnetic column of the magnetic core, and each group of primary coils comprises a primary coil cake; one primary coil cake is arranged between two adjacent groups of secondary coils; each group of secondary coils is formed by winding a lead and forms an upper coil and a lower coil, and in one group of secondary coils, one primary coil cake is arranged between the upper coil and the lower coil; and one primary wire cake is arranged between the uppermost upper coil and the magnetic core, and one primary wire cake is arranged between the lowermost lower coil and the magnetic core. According to the utility model, primary and secondary coupling is added, so that the purposes of reducing transformer leakage inductance, improving conversion efficiency and reducing device loss are achieved.