If panel voltage decreases then PWM increases to maintain same voltage at reduced current.
How about this approach?
Therefore your charge controller input should be able to draw maximum continuous Amperes from the panel.Internally it may have a different waveform. That does not need to be at a constant level, but can be triangular which is typical in a buck converter.
Thanks, for your reply
Starting with solar converter at first i need to design a buck converter could you please help me design it.
1)how to select switching frequency.
2)value of inductor.
3)value of capacitor
Solar vocc=20.7V
Vmpp=18V
Vo/p =14.4V to charge 12V 150ah battery.
Inductor peak current=Io/p+dl/2=9.2+1.61=10.83A.
Another thing i want to ask is:
When battery is getting charged, simultaneously there should not be load drawn from battery right?
That is the inductor peak value implies : the current should not go beyond 10.38A else inductor will saturate which is undesirable for buck converter.Can your PV panel produce 10.83A peak? Your earlier specs reported a much lower figure.
I don't see how that can work.But i thought of modifying the circuit as shown below in diagram.
There i have used two n-channel MOSFET N1:will turn on during Ton time and N2 :will turn on during Toff time.Would the circuit below work as a buck converter?
Switching frequency 20Khz = 50uS
On time of buck converter 12/17 x 50uS = 35uS
Inductor will have 17 - 12 = 5 volts across it during on time.
Rate of current rise 5v x 35uS divided by 250uH = 700mA
Peak to peak ripple 0.7A / 6.66A = maybe about 10.5%
.
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?