# Secondary series connection of power transformer and secondary parallel connection of transformer

2019-05-24 12:25:41 JuKe Technology (DongGuan) Co., Ltd. Read

Secondary series connection of power transformer and secondary parallel connection of transformer

The secondary series of Power Transformers is a combination of two or more transformers when the single power is satisfied and the secondary output voltage is not met. For example, if the primary input of two transformers is 220V and the secondary output is 18V, if the load is supplied with 33V, the secondary of the two transformers can be used in series. The secondary series connection of the power transformer is also very easy, and the different secondary outputs can also be applied in series in the secondary as long as the power of the individual transformer is guaranteed.

The series-parallel application of the power transformer is independent of the linear power supply circuit and the switching power supply circuit. In the previous linear power supply circuits, there were more applications in the secondary series, such as the line-reverse transformer in the TV set, which used the series connection of the transformer secondary. In the current high-power switching power supply, the application of the secondary parallel connection is more. In the above-mentioned one-hundred-watt switching power supply, the secondary of the transformer is often connected in parallel to increase the power.

The secondary shunting of the power transformer is the application where the output voltage of the single transformer secondary is the same and a single power cannot be met. Its application is to superimpose the secondary currents of multiple transformers to meet the power requirements of the load. The secondary parallel connection of the power transformer allows the output power to be the sum of the power of multiple transformers. Pay attention to the following points when applying series and parallel connection of power transformer:

(1) Different secondary outputs, if used in parallel, are preferably performed after voltage regulation, and the parallel voltage is the lowest voltage value in the transformer output. In the case of secondary series application, it can be a secondary direct series connection, or it can be connected in series after voltage regulation.

(2) Common ground in the power supply circuit is necessary. Potential comparison and voltage calculation can only be performed under a reference point condition

(3) When the power transformer is connected in series and parallel, pay attention to the same name of the transformer. When it is used in series, it should be serialized and cannot be reversed. When used in parallel, the same name and the same name should be used together, otherwise the transformer will be burnt.

(4) The above calculations are only ideal algorithms, but the actual transformer losses after their series-parallel connection are very large. The secondary output voltage of each power transformer will be lower than the above calculation.