Method for solving primary multi-path parallel current sharing by utilizing magnetic circuit full coupling

Abstract

The invention provides a method for solving primary multi-path parallel current sharing by using magnetic circuit full coupling, which can realize multi-path direct parallel autonomous current sharing. Multiple paths can use one set of driving circuit, so that the circuit topology is greatly simplified, the inductance and transformer design method is optimized, and any other hardware cost is not increased. According to the implementation scheme of the method, multiple inductors and transformers which are directly connected in parallel are designed into a full-magnetic coupling mode; when multiple paths of windings are wound, a doubling same-direction winding method is adopted, and abnormal current caused by inconsistent parameters such as switching devices, capacitors and loop parasitism is forcibly equalized by utilizing the principle that the windings are equal in circle and same in phase and transformers are mutually embedded among the windings.

Description

technical field [0001] The invention relates to a method for solving primary multi-channel parallel current sharing by using full coupling of magnetic circuits. [0002] technical background [0003] In a switching power supply, when multiple branches on the primary side are directly connected in parallel, static and dynamic uneven currents will be caused by parameters such as the internal threshold voltage of the switch tube, on-resistance, and external parameters such as loop stray inductance, parasitic capacitance, and discrete components. . [0004] With the improvement of the power level and density of switching power supplies, in order to solve the problem of insufficient capacity of the original devices, most of them adopt the method of multi-channel parallel connection. However, direct multi-branch parallel connection will inevitably lead to dynamic and static uneven current due to discrete parameters of switching devices, capacitors, etc., and loop parasitic paramet...

AI Technical Summary

Problems solved by technology

However, if multi-branch parallel connection is performed directly, the discrete parameters of switching devices, capacitors, etc., and the loop parasitic parameters of layout, routing, and drive loops will inevitably bring about dynamic and static uneven current flow.

Using methods such as device screening and loop independence, the comparison brings a huge increase in cost

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