EVO1 with recess into the transformer power supply

Any in-depth study of a specialized topic should begin with history and consider not the current product, but try to follow the evolutionary path of the developers. So, for a better understanding of the topic of repairing control modules, we will first disassemble the first modules of washing machines; they have a simpler and more understandable structure, especially the power supply. Any module of a washing machine can be represented in the form of a simple circuit, where there is a power supply that converts the alternating voltage in the 220 volt network into the constant voltage we need 12, 5 or 3.3 volts, making some of them stable, i.e. independent of load size and input voltage. (by load we mean everything that consumes electric current, relay, heating element, motor, microcontroller, etc.) The key element of the control module is a microcontroller, which has three points of contact with the outside world, the first is power, all controllers are demanding on power, the slightest change in the quality of power leads to a failure. Input data is the second point, i.e. controller contacts through which it receives information about the external environment, for example water temperature and its level, speed and uniformity of rotation of the drum, all this information enters the microcontroller. And the third point of contact of the microcontroller is the output or executive commands, which are built on the basis of the embedded program (firmware) and adjusted relative to the input data. There are two types of power supplies in washing machine control modules: ->Linear (transformer) LBP ->UPS switching power supply Until 2000, linear power supplies were more often used, but over time they gave the palm to switching ones The transformer power supply can be divided into 4 components 1. Transformer - reduces the voltage from 220 volts to 12 volts 2. Rectifier - converts AC voltage to DC 3. Filter - makes the voltage more even 4. Stabilizer - regulates the voltage relative to the load and input voltage The EVO1 power supply has two lines, 12 and 5 volts. The 12 volt line is not stabilized and is used in those elements where the voltage is not fundamental and can vary, for example, for the operation of the heating element relay, 6 volts are enough to close and 2 volts to maintain the closed voltage, although the standard voltage as marked is 12 volts. For a microcontroller, such a spread is unacceptable and the power supply tolerance is measured at 0.1 volts, so one of the most important conclusions to be drawn is to always check the voltage on the controller and strictly control it, while you can ignore the power circuits, such as relays. Most error codes are generated according to time codes, for example, 2 minutes are allotted for water collection (let’s assume), i.e. The microcontroller sent a signal to the CEN to open the water collection valve and within 1 minute it should see that the empty tank signal has disappeared, it means the water supply has started, if it takes longer than 5 minutes (depending on the firmware and settings of the developers, the numbers are just off the top of my head), it means either the pressure is weak or the level sensor is faulty
Осциллограф и мультиметр.jpg
Осциллограф и мультиметр.jpg
Offcanvas
Some text as placeholder. In real life you can have the elements you have chosen. Like, text, images, lists, etc.