Hi all
I have a question about using a DC/DC Converter to regulate current during battery charging/discharging. How is this done mathematically?
Let's say I have a rechargeable battery connected to a DC bus via a DC/DC converter. An example is given here on page 14, using Fig 14
http://ecee.colorado.edu/ecen4517/materials/Encyc.pdf
In the paragraph below Fig 14, it says "The magnitude and polarity of the battery current can be controlled via adjustment of the duty cycle D".
So how is this battery current control achieved in terms of mathematics and formulas?
My understanding of the problem is as follows,
For example, at a particular instant, the battery registers 10V. So I charge it from a 50V bus, which means buck mode, then the duty ratio formula for an ideal buck converter would be
V_batt / V_bus = D = 10/50 = 0.2
However, current is also regulated by this formula
I_bus / I_batt = D = 0.2
So how can I specify that I want to charge the battery at say, 1A (I_batt = 1A) using the duty ratio D since the duty ratio is already locked at 0.2?
Thanks in advance and please correct any misconceptions I have!
I have a question about using a DC/DC Converter to regulate current during battery charging/discharging. How is this done mathematically?
Let's say I have a rechargeable battery connected to a DC bus via a DC/DC converter. An example is given here on page 14, using Fig 14
http://ecee.colorado.edu/ecen4517/materials/Encyc.pdf
In the paragraph below Fig 14, it says "The magnitude and polarity of the battery current can be controlled via adjustment of the duty cycle D".
So how is this battery current control achieved in terms of mathematics and formulas?
My understanding of the problem is as follows,
For example, at a particular instant, the battery registers 10V. So I charge it from a 50V bus, which means buck mode, then the duty ratio formula for an ideal buck converter would be
V_batt / V_bus = D = 10/50 = 0.2
However, current is also regulated by this formula
I_bus / I_batt = D = 0.2
So how can I specify that I want to charge the battery at say, 1A (I_batt = 1A) using the duty ratio D since the duty ratio is already locked at 0.2?
Thanks in advance and please correct any misconceptions I have!