BẾP TỪ TỔNG HỢP CÁC KHỐI Induction cooker

Hello everyone, in this video I will summarize all the basic electrical circuits in a common cooktop Through it, we will understand the principle of operation of each circuit It will serve the work of more effective repair First, I want to talk about the principle of operation of the cooktop The cooktop operates based on the principle of the Foucault series If you want to know what the Foucault series is, you can google it The 220V power supply of the cooktop will be converted to DC about 300V From this 300V DC power supply, it will be passed through a winding After that, an IGBT will be closed and opened continuously To convert that 300V DC power to a DC current flowing through the winding With a consumption current of 5-10A When the cooktop has a continuous change of current, it will generate a DC magnetic field It is combined with ferrite bars at the bottom of the cooktop When the magnetic field is generated, the magnetic field is perpendicular to the bottom of the cooktop The bottom of the cooktop is the magnetic field of ferrite The magnetic field of ferrite is the magnetic field of the cooktop The bottom of the cooktop is the magnetic field of ferrite The magnetic field of ferrite is perpendicular to the bottom of the cooktop The bottom of the cooktop will generate heat The heat generated by the bottom of the cooktop will be transferred to the inside of the cooktop The bottom of the cooktop is the magnetic field of ferrite The magnetic field of ferrite is perpendicular to the bottom of the cooktop To control the IGBT to be closed and opened continuously With a very large consumption current, there must be a circuit to control This circuit is called MCU Inside the MCU, the manufacturer has created a control program Inside the MCU, there is a running software There are pins to receive signals from external circuits The pins to receive signals from external circuits are drawn as names Through these signals, the MCU will process Through the software, the MCU will generate signals for the external circuits The MCU will generate signals for the external circuits I have already made a video about this power supply, so I won't talk about it here. If you want to know more about this power supply, you can watch my previous video. The second line of the power supply will go to the power supply circuit. There is a 15A to 20A rectifier. The rectifier will be connected to the amplifier. The amplifier will go through a L-shaped circuit. The circuit will bring the power from the amplifier to the resistor. The 300V resistor will be connected to the C pin of the IGBT and will wait for the circuit to stop. And when the circuit is broken, the resistor will be isolated again by a green LED. Now I will talk about each circuit The first circuit is the input AC voltage This circuit is used to measure the input voltage for MCU MCU will know whether the input voltage is enough for the kitchen to work or not If the input voltage is too high or too low, it will report an error and not let it run There are some kitchens that I have seen When the voltage is below 200V, the kitchen only works at low power The power supply is only about 6A when I set it to the highest power On this circuit, the input AC voltage is drawn as a component on the main media Of course, I have omitted the necessary components I only put the important components for us to analyze The app will take this D3 and put the 1-axis signal at this position It does not go through the cabinet The 1-axis signal here will have an increase in frequency like this Because it is adjusted to 2.5V, it will change like this The 1-axis signal will go through a 240K resistor and will be divided into 2 lines The first line goes through the 240K resistor and the 1.2V resistor It goes to the 1-axis of the MCU I think this 1-axis will receive the 1-axis voltage modulation I think there will be a processing circuit inside To know what the input voltage is Because if the input voltage is too low It will not ensure the stability of the DC voltage of this power supply Because the low voltage will adjust the current with a small capacitor It does not ensure the 1-axis voltage And another line goes through the 240K resistor And it has a 10mF capacitor This line is used to measure the large and small voltage of the power supply Because it has a capacitor It creates a delay with fast voltage change If the input voltage is too high or too low The power supply will not work And if the components on the AC circuit are defective For example, the ground current The power supply will not work I often meet with MENIA When the ground current is broken The power supply still works normally But when the power supply is broken The power supply will not work And when the power supply is turned on It will show errors on the screen For example, the Cycle SK2006 When there is an error on this line It will show E5 or E6 E5 shows low voltage E6 shows high voltage The ground circuit is where the control circuits are made The control circuit that we control Will be sent to MCU The MCU will execute the control circuit And the MCU will display the operating parameters And the error code will be returned to the ground circuit The MCU and the ground circuit are connected in 2 directions In the press-button kitchen It is not a touch screen They usually use ICs TM1668 or 1628 This is an IC that handles the pin signal 3. Heat transfer In the press-button kitchen The MCU receives 2 heat transfers One is in the middle of the press-button And the other is in the YYBT And the other is in the middle of the press-button In the middle of the press-button It will detect the temperature of the glass As well as at the bottom of the pot When the temperature at the bottom of the pot is too high It will make a noise To prevent the user from cooking To prevent the water from burning I feel the temperature on this line There is a heat transfer When the temperature at the bottom of the pot is too high It will detect the temperature at the bottom of the pot When the temperature at the bottom of the pot is too high It will detect the temperature at the bottom of the pot When the temperature at the bottom of the pot is too high It will detect the temperature at the bottom of the pot When the temperature at the bottom of the pot is too high It will detect the temperature at the bottom of the pot Now, I will tell you how to fix this problem I will use the IP address cable And I will connect it to a network And I will change the power And when I cook 1800W And when the water starts to boil, the display screen is still 1800W But the EVT shock has decreased to 6A So it knows that the water has boiled, it will automatically reduce the power The second heat sink is installed in this piece of aluminum It is located on the body of the EVT And like some models, it is installed at the position of the E-pin I have already removed it It is installed at the position of the E-pin of the EVT The purpose is to feel the temperature of the EVT When the temperature is too high, it will stop the EVT To protect the EVT The principle of this circuit is different Because each kitchen has a different design The principle of this circuit is that the voltage is 5V When the voltage is too high, it will stop the EVT And the heat sink will run out of power At that time, the heat sink will not generate heat Because the EVT is locked The fourth is the heat sink The EVT and the 20A bridge When it is in operation with a large consumer range It generates a lot of heat In addition to the heat sink, there is also a fan to cool it In the EVT, the fan uses 18V power The 18V power will go to the fan bed And go to the fan bed Then it goes to the C pin of the 8050 Wait for the C pin of the 8050 to open the fan The fan will run When you turn on the fan When the fan is running, the voltage will go up to 5V The fan will not stop right away Then it will give the command at the control leg of the fan to go back to zero At the zero point, at the B leg, the fan loses pressure, it will lock the car, then the fan will stop When the fan stops, it will generate a reverse current In the fan, there is a wire that is running and stopping, then the wire generates a reverse voltage It will generate a reverse current to stop the fan In the two legs of the fan, there is a reverse diode Especially in the support fan, the MCU will recognize the temperature of the IGBT to adjust the fan speed When the fan is not too hot, the MCU will put the voltage at the control leg of the fan, the voltage is low, the 8050 fan will run small When the temperature of the fan increases, the voltage at the control leg of the fan will increase, the speed of the 8050 fan will increase and the fan will run a little faster When the fan is running at the highest temperature, the voltage at the control leg of the fan is 5v, the 8050 fan will open the fan and the fan will run the fastest fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the fan is not hot, the 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