Is it possible to get a DC DC converter which the output voltage varies proportionally to the input voltage? ie 14V in 28V out, 13.4V in 26.8V out.
To add some context I wish to charge a 24V battery system and use it to provide power to a 1.1Kw (1.5HP) 24V motor.
In this case charge would come from a wind turbine controller with a 12V output with a current between 100mA and 1.5A. Obviously the voltage would be greater than 12V in order to charge a battery and this is where my question comes from. If i was to use a 12VDC – 24VDC converter could it provide a charge to the 24V battery bank.
I'm open to suggestions, if you can envisage a better way then please let me know.
Thanks
Best Answer
Yes, Vicor, for example, makes a line of such converters, typically used for point-of-load conversion from a regulated high voltage (e.g., a 48V distribution bus) to a low-voltage, high-current supply for a CPU. (Note the option for "fixed ratio" under "Output Voltage".)
You could easily construct a boost converter that has the same property. In fact, any continuous conduction mode switched converter (buck or boost) operating with a fixed duty cycle has this property.
But such a converter would not be particularly useful in terms of using a 12V battery charger to charge a 24V battery pack. The converter would prevent the charger from getting any feedback about the state of the battery, leading to overcharging.