A project which needs help and advice.

Discussion in 'The Projects Forum' started by pllp89, Jun 3, 2009.

  1. pllp89

    Thread Starter New Member

    Jun 3, 2009
    7
    0
    Hi all,

    i need help regarding a project given by the school. It's very important so i would really appreciate all the help and advice that you all can provide me with.

    My project is about designing a simple battery circuit with diode. I'm not really good with electronics so i don't know how to start with and doesn't know how to design one at all. can you guys help me ?
    the battery used will be VARTA. Type Number: 55608. V80H. Its a nickel metal hydride battery.

    Please do assist me. Thank You. :)
     
  2. Søren

    Senior Member

    Sep 2, 2006
    472
    28
    Hi,

    Here you go :D
    [​IMG]
    Exactly as you requested, but probably not what you want anyway.



    A good start would be to reveal the purpose of the circuit you want.
     
  3. pllp89

    Thread Starter New Member

    Jun 3, 2009
    7
    0
    Hi Soeren,

    firstly, thanks for the help. :)
    okays, i will now elaborate more on my project.
    next week i will have to create a schematic diagram for battery charging with diode. as quoted by my teacher, he said its the " old method" of designing a circuit.
    then i would have to do the prototype out.
    then after that, i would have to implement the prototype into one with proximity and temperature sensing. cause i would have to place this circuit into an alarm clock, whereby the proximity sensor works by stop charging when it sense motion near it. and that the temperature sensor works by stopping the charging to prevent overcharging. (safety precaution)

    sorry to be asking this, but if i really were to create a schematic diagram for the battery charging circuit with the use of diode, can the design be more complicated ? as in cause yours is nice but i doubt the teacher would expect it to look-as-easy-as-what you did.

    i'm really feeling very stressed out over this project and i really hope you would assist me. thank you so much!
     
  4. Søren

    Senior Member

    Sep 2, 2006
    472
    28
    Hi,

    As I understand it you want to do it with just a diode?!

    It can be done, but it will take a transformer as well (the power has to come from somewhere).

    [​IMG]
    The current limiting is based on the transformers internal resistance. I wrote 1/10 of capacity in the schematic, but that might even be way too much.
    The voltage of the transformer secondarty should never be more than 1.4V/cell (max.).
    If you cannot find a transformer with precise specs. you need to include a bit more components.
    It's a very poor circuit. With careful selection of the transformer, it is possible, but this method, even with added temperature control, is really abuse of your battery - tell your teacher to get out of the sixties :D


    Or perhaps I'm reading it wrong and you just need a LED (Light Emitting Diode) as an indicator in a slightly more complicated circuit?
     
  5. pllp89

    Thread Starter New Member

    Jun 3, 2009
    7
    0
    Hi,
    i will be typing out the whole assignment so as to be more detailed. it's a little confusing and the parts doesnt contained proximity sensor because it was a added on request from the teacher.

    And also provided is a Cypress PSoC First Touch product. model number: CY3270. It's a First Touch Expansion card connecting to a FTPC bridge with inbuilt proximity sensing, temperature sensor and also a touch sensing slider to control the LED colour.( however i have trouble finding the program codes while using the program to try out the different functions for the sensors.)

    This is what was given to me, (thanks for taking time to read through!)
    Title Of Project : Development of a battery charging circuit with temperature sensing + proximity sensing.

    Objectives:
    In this project, the student will be developing a battery charging circuit with temperature sensing for applications in home device such as alarm clock. In the first phase of this project,student will learn on the operations of the CYPRESS PSOC development kit and be familiar with the development environment and its sample program for temperature sensing with buzzer to indicate overcharging. In addition, the student will have to understand the connections in sensing circuit.This is to enable the integration of the temperature sensing circuit with the battery charging solution such that the temperature sensor will only operates during charging.

    In the second phase of this project, students will be designing and implementing battery charging circuit. In addition,the student will also be integrating the battery charging circuit with the temperature sensor. the student is required to demonstrate the developed work as a standalone device to support battery charging solution with temperature sensing for prevention of overcharging and safety of operations.

    Through this phase, students should have
    a) basic understanding of temperature sensing with buzzer warning
    b) basic understanding of Cypress PSOC development environment
    c) design and develop a battery charging solution with temperature sensing
    d) implementation of the designed solution for home devices such as an alarm clock

    DESCRIPTION:
    In this project, basic understanding of temperature sensing will be involved with good exposure to the Cypress Psoc development tools. Students will have to characterize the sensors performance followed by the implementation of the sample programs to display the appropriate results through the on board LED/Buzzer. Student will also have to develop a battery charging circuit to work with the temperature sensor.

    The next phase of this development will require the integration of the PSOC kit with the battery charging circuit into a single solution. The temperature sensing will only operate during charging and once the charger is removed, the temperature sensor will not operate so as to minimize power consumption. this phase of the project will be deemed completed when the system is packaged as a product to charge the battery for an alarm clock and proven to work with simulated over heating.

    Specifications:
    - Understand temperature sensors and battery charging circuit design
    - Develop the hardware battery charging circuit with temperature sensing
    - Package the solution as a standalone product for demonstration

    Thats everything given to me.
    Was brief by the teacher and given tasks to do research on everything about all of this.
    But having some difficulties understand the Cypress PSOC development kit cause it didnt state alot and also understanding temperature sensors and battery charging circuit design. I have checked out the different kind of sensors but as for understanding circuits( which the teacher thinks that it's very important) it's quite hard for me.
    Task given is that the alarm clock implementation will be put on hold till i finish all the first phase.
    I would have to search for circuits, to create a battery charging circuit using diode method with the battery ,VARTA. Type Number: 55608. V80H. Its a nickel metal hydride battery.
    In addition, i have to understand the connections in sensing circuit which i have totally no ideas of!

    It's a very long post and for whoever who are reading it and helping me, Thank You so much.
     
  6. pllp89

    Thread Starter New Member

    Jun 3, 2009
    7
    0
    Hi Soeren,

    Thanks once again for your reply and advice/help regarding the project. I have just post a completed post about my whole project, and if you wouldn't mind, i hope you will look through it and provide me with more informations.

    And as quoted by you in ur lastest reply "Or perhaps I'm reading it wrong and you just need a LED (Light Emitting Diode) as an indicator in a slightly more complicated circuit? "
    If this is really the case, how should the circuit be designed ?

    Thank you for all your help. :)
     
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