12/5/2023 0 Comments Arduino pwm buck converter![]() ![]() ![]() I am no more working on this project due to some issues. So Current flows from Battery -MOSFET Q3- GND which is unexpected. The issue was that when I connect the battery to the controller, the connection between the battery and the switching ( buck converter ) becomes very hot and then MOSFET Q3 burns out. Buck circuit working and design calculationĭuring my prototyping, I have faced a critical issue. So for simplicity I divided the entire project in to small sections. Input Voltage = Solar panel with Open circuit voltage from 12 to 25V 20x4 character LCD display for displaying voltages,current,power etcĨ.USB port for Charging Smart Phone /GadgetsĤ. Specification of version-3 charge controller :Ģ. The Arduino tries to maximize the watts input from the solar panel by controlling the duty cycle to keep the solar panel operating at its Maximum Power Point. The Maximum Power Point Tracker (MPPT) circuit is based around a synchronous buck converter circuit.It steps the higher solar panel voltage down to the charging voltage of the battery. If you are aware about the basics of MPPT charge controller then skip the first few steps. I put a lot of effort to make it simple, so that anyone can understand it easily. It requires some basic knowledge of power electronics. It is 30 to 40 % more efficient at low temperatures.But making an MPPT charge controller is little bit complex in comparison to the PWM charge controller. It has several advantages over the earlier charge controller. The MPPT controller is more sophisticated and more expensive. Nowadays the most advance solar charge controller available in the market is Maximum Power Point Tracking (MPPT). You can also use other Arduino board like Pro Mini,Micro and UNO. This design is suitable for a 50W solar panel to charge a commonly used 12V lead-acid battery. The microcontroller used is in this controller is Arduino Nano. It is equipped with various protections to protect the circuitry from abnormal conditions. It has features like LCD display, Led Indication, Wi-Fi data logging and provision for charging different USB devices. This instructable will cover a project build for an Arduino based Solar MPPT charge controller. If you are new to this please refer to my earlier tutorial for understanding the basics of the charge controller. I have posted two versions of my PWM charge controller. So once again using the next figure formulas we obtain the current of the OFF part.Welcome to my solar charge controller tutorials series. In this case the voltage across the inductor is the output voltage. If the switch is closed again before the inductor fully discharges (on-state), the voltage at the load will always be greater than zero. During the off-state, the inductor is discharging its stored energy into the rest of the circuit. The "increase" in average current makes up for the reduction in voltage, and ideally preserves the power provided to the load. This current, flowing while the input voltage source is disconnected, when concatenated with the current flowing during on-state, totals to current greater than the average input current (being zero during off-state). The stored energy in the inductor's magnetic field supports the current flow through the load. The decreasing current will produce a voltage drop across the inductor (opposite to the drop at on-state), and now the inductor becomes a Current Source. When the switch is opened again (off-state), the voltage source will be removed from the circuit, and the current will decrease. As we can see in the next figure we obtain the ON current through the inductor. But we also know that the inductor voltage is the inductance L multiplied by the inductor current derivate. When the switch is ON the inductor will charge up and the voltage on the inductor will be the difference between the output and the input. If the switch is opened while the current is still changing, then there will always be a voltage drop across the inductor, so the net voltage at the load will always be less than the input voltage source. During this time, the inductor stores energy in the form of a magnetic field. Over time, the rate of change of current decreases, and the voltage across the inductor also then decreases, increasing the voltage at the load. This voltage drop counteracts the voltage of the source and therefore reduces the net voltage across the load. When the switch is first closed (on-state), the current will begin to increase, and the inductor will produce an opposing voltage across its terminals in response to the changing current. In the ON part, the switch is closed as we can see in the next figure where the diode is open becasue the cathode voltage is higher than the anode. In order to study how it works, we will divide it in two stages. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |