COURSES TAUGHT BY PROF. VALDENILTON: Basic Electronics Course Level 1 and 2 Online (100% in VIDEO) https://go.hotmart.com/S90922297H?dp=1 Digital LCD/LED TV Repair Course (100% in PDF) https://technologycursos.wixsite.com/... Transformer Winding Course (100% in PDF) https://hotm.art/Curso-de-enrolamento... COURSES TAUGHT BY OTHER TEACHERS: Basic Electronics Course (with a focus on repair) https://hotm.art/Curso-de-eletronica-... Basic Electronics Course (with a general focus) https://hotm.art/Curso-de-eletronica-... Cell Phone Repair Course (version 5.0) https://hotm.art/Conserto-de-celular-top Cell Phone Repair Course Notebook Motherboard https://hotm.art/Conserto-de-placa-ma... Voltage Inverter Manufacturing and Repair Course https://hotm.art/Aprenda-a-fazer-inve... Photovoltaic Solar Energy Course https://hotm.art/Curso-energia-solar-... Complete Digital Marketing Course (from scratch) https://hotm.art/Curso-de-Marketing-D... Alternating current rectification can be performed by diode bridges composed of three or four terminals. In this series of two videos you will understand why. When the secondary winding of a transformer has only two wires at the output, rectification needs to be done by 4 diodes connected in a Wheatstone bridge. This diode bridge is usually found in an encapsulation where the diodes are internally protected and only the 4 terminals are exposed, to be connected to the circuit. The two transformer wires are connected (usually) to the central terminals of the diode bridge and a pulsating direct voltage is collected at the extreme terminals. Since the Wheatstone bridge is made up of four diodes, the total voltage of the transformer secondary (100%) will be available at the extreme terminals of this bridge with a frequency equal to twice that of the electrical grid (120 Hz). Another observation to make is in relation to the negative pole formed by the diode bridge. Since this negative is actually the rectification of the negative half-cycles of the grid, this potential is actually a negative voltage (-Vcc) that serves as a reference for the positive voltage (+Vcc) that comes out of the diode cathodes. This means that this ground is live or hot (HOT) and if safety precautions are not taken, there will be a risk of electric shock. When the transformer secondary winding is made up of three wires (i.e., it has a central tap), the rectifier bridge is made up of only two diodes that have their cathodes joined at a common point, with the central wire of the secondary winding acting as a ground reference (0V). In this way, each end of the transformer's secondary winding is connected to the ends of the diode bridge, where the two internal diodes will rectify the voltage by alternating their conduction every eight milliseconds. As a result of the alternation of the diodes, we will have at the output of the diode bridge (cathodes or central terminal) half (50%) of the voltage available in the secondary winding. In this type of rectification, the output frequency is equal to that of the electrical grid (60 Hz) and since the tap works as ground (0V), it is considered a cold ground (COLD). The diode bridge that has three terminals is usually assembled with Schottky diodes, which are high-frequency diodes, responsible for rectifying the secondary voltage of the chopper transformers of switched-mode power supplies. I hope you were able to understand why the Schottky diode bridge only has three terminals and can now analyze circuits that have this component more accurately and safely. VIDEOS TO COMPLEMENT THE STUDY: SHARE THIS VIDEO WITH FRIENDS: • Schottky Diode Bridge: Why it... SUBSCRIBE TO OUR CHANNEL BY CLICKING THE LINK BELOW: / @technologycursosoficial Hello, I'm Prof. Valdenilton, Technical Coordinator of the Electronics courses taught by Technology Cursos. I love transforming people's lives through teaching. My goal is to teach people like you to fix the electronic equipment they love, helping in every possible way. INFORMATION: Our Website: https://technologycursos.wix.com/tech... Business Contact: [email protected] Whatsapp Center: (82) 9 8706-9200 COME SAY HI ON MY SOCIAL NETWORKS: Instagram: / technologycursos Facebook: / technologycursos