The diode bridge is the most common radio component. No power supply unit can do without it. Its main function is to rectify alternating current into a constant pulsating one. As a result of such a transformation, a pulsating current is obtained at the output of the bridge, the frequency is twice that of the input, but with a stable polarity. A diode bridge can be assembled from individual diodes or as a monolithic diode assembly.
Instructions
Step 1
Take an aluminum heatsink (about 800 cm²) to cool the assemblies. The idea is to connect diode assemblies in parallel. But, since each diode assembly has a different internal resistance, this leads to the idea that the differences in the temperatures of the diode bridges will be different and tangible.
Step 2
Prepare the radiator surface. To do this, drill holes and cut threads to secure the assemblies. In order to improve heat transfer, use KPT-8 heat-conducting paste. After that, bolt the diode assemblies with a pipe wrench.
Step 3
Solder the circuit with a copper bus. For example, you can use a 10 mm kV bar. in order to solder to the terminals of the assemblies, and 20 mm kV. for input-output welding voltage. It is recommended to be sure to solder the bar to the terminals of the diode bridges. Checked - if you connect the bridges using terminals without soldering, then the ends of the bridge leads will be very hot.
Step 4
Treat the soldering points with varnish. As a result of the work, you will receive a compact diode bridge, which will be very convenient when assembling a semiautomatic welding device into a device. If you plan to use more powerful currents, then increase the number of assemblies. As practice shows, cooking with an apparatus takes 50% of the time, and sometimes much less. That is, you first need to prepare the part for welding, and then cook.
Step 5
After welding, it is necessary to prepare the part for welding again, it is at this time that the semiautomatic welding machine will be in standby mode, and this time will be quite enough to cool the diode bridge. This is a positive aspect of using less powerful diodes. The result is an inexpensive and high-quality diode bridge for a semiautomatic welding machine.
Step 6
You can go a shorter way. Purchase expensive diodes of type B200 and assemble a full-fledged rectifier diode bridge from them, assemble a semiautomatic welding machine with a large supply of voltage and use it without thinking about anything. But, unfortunately, the end does not always justify the means.
