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Recent content by ashare

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    [SOLVED] Difference between an MPPT solar charge controller and an ordinary charge controller

    Hi Akash, That is my understanding as well. Let's hope 'WimRFP' replies to your query. Regards, Ashare
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    [SOLVED] Mosfet W/L ratio for DC-DC converter

    Thank You, Max. Regards, ashare
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    [SOLVED] Mosfet W/L ratio for DC-DC converter

    Thank You, Max for the detailed explanation. Could you please answer the following questions as well? Can this be obtained from the Foundry data? Also, could you tell me how do we decide the minimum W value which can handle the current I intend to pass through the transistor? Do I need to...
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    [SOLVED] Mosfet W/L ratio for DC-DC converter

    Dear All, I am planning to design of a DC-DC Buck-Boost converter in Global Foundries 180n process. Could anyone advise me what is the starting point to derive the MOSFET W/L ratios required for the design. I understand that the MOSFETs used should be able to handle the current for which I am...
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    MPPT for photovoltaic application (using microcontroller)

    Thank you for the elaborate answer. Kindly let me know if I need to implement any special constant current circuits or can I do current control by controlling the duty cycle of the controller? Regards, ashare
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    MPPT for photovoltaic application (using microcontroller)

    Thank you for your reply. With regard to the above response I have a few queries. Please find them below: a) In the context of the bulk charge, what would be the internal impedance of the battery? [low, isn't it?] If low, does this mean I need to program the micro controller to limit the...
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    MPPT for photovoltaic application (using microcontroller)

    Dear All, I am planning to implement an MPPT algorithm for solar powered battery (Lead Acid, 12V, 7Ah) charger. The solar panel is a 50W one. At peak power it can give 18V and 2.78A. It has a Voc of of 21V and Isc of 3A. I have some querries regarding the design I plan to do, which are: 1...
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    [SOLVED] Difference between an MPPT solar charge controller and an ordinary charge controller

    Thank you. That cleared my doubt. I really appreciate your patience! :-)
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    [SOLVED] Difference between an MPPT solar charge controller and an ordinary charge controller

    Please see the attached image. It is an excerpt from Microchip App note AN1521 for implementing MPPT. It's mentioned that panel voltage is modified by changing the duty cycle. I didn't completely understand this though. It could be that the DC-DC converter is providing an impedance match to tap...
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    [SOLVED] Difference between an MPPT solar charge controller and an ordinary charge controller

    Thanks for your kind reply. Could you elaborate on the quoted text above. As per my understanding, the only thing which can be changed by altering the duty cycle of the power switch is the output voltage. The current drawn is determined by the SoC of the battery. The batteries which are required...
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    [SOLVED] Difference between an MPPT solar charge controller and an ordinary charge controller

    I understand your first point clearly. What confuses me is the second. Assuming that there is a deeply discharged 12V lead acid battery battery at the load, and assuming that it requires 13.6 V to charge and it takes 3A continuous current to charge. The power requirement at the output is 40.8...
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    [SOLVED] Difference between an MPPT solar charge controller and an ordinary charge controller

    Hi Everyone, I have been reading about MPPT charge controllers and their advantages over ordinary ones (PWM based??). My question is how is an MPPT charge controller superior than a buck-boost (BB) converter chip or for that matter any converter chip? The MPPT algorithm takes in parameters like...
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