How can i build a boost DC/DC Converter that can boost from 24 to 96V without the output voltage depending on the load?
Why? Because i need to charge a battery system that has already been designed and i cant know what is the load resistance…
Basically, i need to charge some batteries using a solar panel to get the energy, it is for charging an electric car, and i cant find a charge regulator for the panels that outputs the 96V needed, i also cant change the battery system in the car to meet the 24V i get from the charge regulator, so what i thought about was this type of converter that would probably reduce the maximum output current but i dont really care, because it doesnt matter how long it takes to charge, it just matters that it charges something so we can use the sun as a power source, anything is better than nothing, which is our current setup.
How would i proceed with the calculations? I've designed some boost/buck converting systems before, but none where i dont know the load resistance, but im assuming there is a way of making the output voltage the same or with a reduced change depending on the load…
Best Answer
If you are looking for a general tool or guide to switch mode power supply design, there are several on the net, as well as free online design tools on the web sites of manufacturers such as:
These tools require information about input supply (AC or DC, voltage range) and output requirements (Voltage, acceptable ripple, current rating), and provide suitable part numbers and computations - evidently favoring the respective manufacturer's products, of course.
Many of these tools go as far as providing a schematic, a bill of materials, performance parametrics and even design simulation, all for free.
A boost regulator design does not need the load resistance to be known in advance: There would be a minimum load current specified for stability in many designs, and of course a maximum current rating depending on the switching devices used (internal MOSFETs in the boost controller, external power MOSFETs etc). As long as the load is within those two limits, the boost regulator would supply the desired voltage to the load.
Note: I've already checked with TI WeBench Power Designer but it cannot find a suitable solution to your requirements, so perhaps you can skip that one and try the others.