Transformer for improving the precision of output voltage

Abstract

The invention provides a transformer for improving the precision of output voltage. The transformer comprises a magnetic core and a framework matched with the magnetic core. The magnetic core comprises a plurality of side columns and a central column. The side columns are respectively arranged around the central column. The sectional areas of the side columns are respectively equal and the sum of the sectional areas is equal to the sectional area of the central column, and the sectional area of the connecting part between each side column and the central column is equal to that of each side column. The central column is provided with a primary winding and a secondary integral multiple winding. The side columns are respectively provided with a secondary winding with less than one coil and the secondary winding with less than one coil is evenly distributed on the side columns according to output current. Without the addition of extra linear voltage stabilizing circuits or magnetic amplifiers, the transformer can realize low-voltage and high-current multiplexed output and improves the precision of the output voltage thereof. The transformer is strong in reliability without the increase of volume and consumption.

Description

technical field [0001] The invention relates to a novel switching power supply transformer, in particular to a switching power supply transformer with ultra-low voltage, high current, multi-channel output and no need for linear voltage stabilization in the subsequent stage. Background technique [0002] In order to adapt to the backup power (battery) power supply, modern integrated circuits have lower and lower operating voltages. Many chips now use ultra-low operating voltages, such as 1.8 volts, or even 1.2 volts. However, in order to reduce the size of the current switching power supply, the operating frequency is getting higher and higher. Now the operating frequency of most switching power supplies exceeds 100KHz, and some manufacturers even use the operating frequency of 1MHz. In this way, the number of winding turns of the transformer becomes very small. For the secondary of low voltage output, it is more than one turn, or less than one turn. If it is rounded, the vol...

AI Technical Summary

Problems solved by technology

If the secondary winding is rounded on the result of theoretical calculation, the output voltage error is very large. In order to obtain an accurate voltage, a linear regulator, switch regulator or magnetic amplifier has to be added in the latter stage, but this increases the transformer. Volume and loss make the circuit more complex and the reliability worse

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