Improvement of network adapters. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Many radio amateurs use inexpensive network power supplies (adapters) to power game consoles, callers, cordless phones, and various home-made designs. Such power supplies are assembled, as a rule, according to the simplest schemes and consist of a step-down transformer, a bridge rectifier and a filter capacitor.
In such adapters there are no elements of protection against a short circuit at the output or a significant increase in the current consumption of the load. You can get out of the situation by adding a fuse to the adapter. But the best option is to install a resettable fuse in the adapter (see the data sheet "Bourns Multifuse Resettable Fuses"in "Radio", 2000, No. 11, pp. 49-51). And at the same time connect to the "reusable" fuse a device for indicating its operation on a bipolar two-color LED from Kingbright.
The inclusion of a fuse with an LED and a limiting resistor is shown in the figure with thick lines. The LED lights up when the fuse blows.
If the adapter is used as a laboratory power supply, select the fuse for the maximum current that the adapter can withstand during continuous operation. For most cases, the fuse indicated in the diagram is suitable, rated for a maximum operating current of 400 mA. For the adapter to the Dandy game console, the MF-R020 for a current of 200 mA is suitable. Instead of a two-color LED, it is permissible to install two single-color KIPD23 series.
The fuse is installed as far away from the transformer and rectifier diodes as possible to avoid heating it. In addition, solder the fuse leads no closer than 15 mm from its body. The disadvantage of the proposed protection option is that after an overload, you have to wait for some time until the conductive properties of the fuse are restored.
Author: A.Butov, village of Kurba, Yaroslavl region
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