Homework Help: How to get constant 12V from this step up converter

1. Jun 7, 2014

Hina Gohar

1. The problem statement, all variables and given/known data

I am working on solar charge controller for 12V battery..From solar panel 8 to 16V variable input goes to step up converter which will double available input voltage and then there would be some
circuit which will make output of converter circuit constant at 12V..simulation of solar panel with
step up converter I have done but facing problem how to make it constant in order to provide proper charging to 12V battery.Regulator IC I can not use because there must be some novality in proposed work.

[2]. Relevant equations[/b]

3. The attempt at a solution

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2. Jun 7, 2014

Lancelot59

Well in leiu of using a DC/DC converter that has the output you want, a regulator would be the only way to ensure a stable voltage. If you can't use an off the shelf package you could always make the regulator yourself out of discrete components.

The simplest way of doing it is having a zener diode with a current limiting resistor. Better regulators are less trivial to create.

3. Jun 8, 2014

CWatters

I'm not an expert on solar panels but don't they have a optimum operating point? So perhaps your circuit should control the current drawn by the charger to keep the panel close to this operating point?

4. Jun 8, 2014

Hina Gohar

optimum point for voltage from solar panel is 13V around

5. Jun 10, 2014

Staff: Mentor

But a 12V power source will not charge a 12V battery...

6. Jun 11, 2014

CWatters

I don't think he means literally 12V, just an output suitable for charging a 12V battery which needs more.