Finally, the buck converter can be switched using a new 7555 based oscillator circuit. And it seems to work in that I can extract 20 Watts when connected to a 12 Volt battery.
Mppt solar charge controller #8 – oscillator driving buck converter components
ByJulian
Jun 14, 2013
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Now I understand why my battery voltage was rising
Solar charging regulator circuit mppt
привет можно схемку
This series is just great. The dc/dc conversion component of mppt always confused me but i think i get it now, it's about current not voltage. The pwm allows the panel to operate at various ideal voltages by modifying the amps sent to the battery, right? Good on you anyway.
i need the schematic cct please
Hallo, is it possible to use the Arduino pwm feature to drive the gate of а mosfet, instead of creating separate oscillation circuit?
Can I drve that mosfet using ir2110???
Two questions:
1. What type and model of mosfet are you using.
2. How are you driving it with the oscillator circuit to achieve proficient gate voltages.
I'm doing my own tracker and using your design as my basis, but have trouble with simulating the buck converter as driving the mosfet is a bit problematic. If it doesn't bother you too much, a schematic of just the driving circuit would be extremely helpful. Also, is the diode on the frontside capacitor just to protect it from reverse voltage, if you accidentally connect the battery the wrong way?
I am an student specializing in the embedded systems, so power circuits are a bit new to me.
ist das Marke eigenbau gut gemacht soweit wie hast du das mit dem Micro controller hin bekommen
Thanks. I am planning a tutorial on buck converters and another on boost converters. There are some other topologies like buck-boost and SEPIC which I may also cover. The MPPT buck converter is unusual because it regulates the input voltage (the solar panel voltage); the output voltage (the battery voltage) is pretty much fixed.
This is a fascinating project. Are you able to give a beginner like myself a 101 video on how the buck converter works? How it lowers voltage and raises amperage, I'm struggling a little to understand how this circuit works.
Large toroids are very expensive, but small inductors need higher frequencies, so independent frequency and pulse width controls are useful.
Yes, eventually I'll put a voltage and current sensor on the battery side so current gain can be measured. Also Watts in and Watts out can be determined so an efficiency percentage can be calculated.
So you want to be able to adjust the pulse width and the freq independently? The other thing I was gonna ask is if you have tried hooking up ammeters on both the input & output ov the converter to see what current gain you're getting?
Yeah I tried the 555 PWM circuit, but you can only adjust the pulse width, not the frequency. I used the triangle wave technique many years ago when I was designing motor speed controllers for electric flight. One brave chap flew one – never again he said, it was jittery as hell. Looks like our summer solstice will be the usual… rainy!
…the one 555/7555, that might be something to look at. Another way to get pulse width is to generate a triangle wave and have a circuit that trips on when it gets to a set amplitude. The advantage ov that I guess is that the trigger voltage can be varied in a very linear way. At least you got some sun though! 🙂 It's nearly the Winter Solstice here and my rig is pretty much keeping the lights on and little else. heh
Haven't been able to see past 4:20 cause Youtube is being a c**t…! heh But it's cool how the circuit is coming along. The 7555s are better because they can swing pretty much full rail which can be handy. Good stuff using it as an inverter, they are more than just timers! They make good Schmitt triggers too, I made a dusk sensor circuit for my little Lighthouse with one. No chattering at switching time – straight on! I have seen circuits around where you can do variable pulse width with just…