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- Maintaining Car Radio Power for 15-30 Minutes After Ignition Off: Implementing Shutdown Delay

marianmaciag 7530 16
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  • #1 16479186
    marianmaciag
    Level 7  
    This is my first post on the forum, so I would like to welcome everyone!

    I am assuming a new topic because, despite reviewing many posts on similar topics, I could not find an answer to my problem. And it sounds like this: I would like to keep the car radio powered for some time after switching off the ignition . This time should be in the range of 15-30min. I have two ideas to solve the problem, but I need help in implementing them.

    Idea 1.
    Shutdown delay based on some buffer / capacitor. An idea similar to this one - Maintaining Car Radio Power for 15-30 Minutes After Ignition Off: Implementing Shutdown Delay , probably only on slightly different elements:
    Problems that I expect: large capacitor capacity forcing a long time to charge, the inability to precisely determine the discharge time

    Idea 2.
    Currently, two types of voltage are given to the radio: constant 12V directly from the battery and used only to maintain memory and 12V served after switching on the ignition and used as the main power supply for the radio. I would like to make a system that, after disconnecting the ignition voltage, will redirect the constant supply voltage in place of the ignition voltage and maintain it for the set time.

    I am asking for help in designing the system (s) and choosing the right values of elements or indicating a better solution, if any.

    Regards,
    MM
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  • #2 16481144
    bodom
    Level 30  
    marianmaciag wrote:
    ... I currently have two types of voltage: 12V direct from the battery and used only to maintain memory and 12V served after switching on the ignition and used as the main power supply for the radio.

    If you disconnect the radio + after ignition and connect this ISO pin to permanent + (i.e. you work with pins 4 and 7 ISO) you will get the expected effect.
  • #4 16481736
    marianmaciag
    Level 7  
    bodom wrote:

    If you disconnect the radio + after ignition and connect this ISO pin to permanent + (i.e. you work with pins 4 and 7 ISO) you will get the expected effect.

    Well, not exactly, because I will have to remember to always turn off the radio before leaving the car, and this is what I want to avoid. I would like the system to cut off power automatically, even if I forget to do it.

    In the meantime, one of my colleagues from the forum probably sent me the best solution to the problem - time relay extending 3SRP15005 + . It looks like I was looking for that. When I order and connect, I will share information about the operation of this system.

    Best regards and thank you very much for any suggestions,
    MM
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  • #5 16516936
    marianmaciag
    Level 7  
    Welcome back.

    The radio power back-up system based on the 3SRP15005 + relay works ok, but it only half-solves my problem. When the ignition is turned off, the radio plays for a certain period of time, but during firing the voltage drops and the radio restarts. The battery is not old, in addition, during firing I try to turn off other receivers, and the car's electrical system is checked and there are no "leaks" anywhere. I would like to remedy this phenomenon by using a buffer. Because, as I wrote earlier, soldering is much better for me than designing circuits, I am asking you for help in designing such a system (the buffer itself) and choosing the right components.
    At the beginning I created something like this - link . The main problems shown by the simulator are a significant jump in voltage during the start of charging the capacitor and a rapid drop in voltage during its discharge. Will this arrangement solve my problem? Should I add any more elements to it?

    Additional information:
    1. Radio supply voltage is of course 12V, but unfortunately I can not find anywhere about the tolerance of voltage changes
    2. Radio power: 4x45W
    3. What is all this for? For two reasons. First: Fiat ignition has only 3 states, not 4 other states like in other cars. This means that when extinguishing the engine, I always disconnect the ignition and radio supply voltage. Secondly: the radio is on Android and its launch time is about 35 seconds, so every time I turn off the car I need 35 seconds to restart the radio. In addition, the radio works as a central unit on which the navigation, reversing camera, road recorder and Torque are activated, so waiting for a restart is simply extremely bothersome.

    Thank you in advance for your help and best regards,
    MM
  • #6 16523095
    VIGOR_PICTURES
    Level 21  
    marianmaciag wrote:
    Welcome back.

    The radio power back-up system based on the 3SRP15005 + relay works ok, but it only half-solves my problem. When the ignition is turned off, the radio plays for a certain period of time, but during firing the voltage drops and the radio restarts. The battery is not old, in addition, during firing I try to turn off other receivers, and the car's electrical system is checked and there are no "leaks" anywhere. I would like to remedy this phenomenon by using a buffer. Because, as I wrote earlier, soldering is much better for me than designing circuits, I am asking you for help in designing such a system (the buffer itself) and choosing the right components.
    At the beginning I created something like this - link . The main problems shown by the simulator are a significant jump in voltage during the start of charging the capacitor and a rapid drop in voltage during its discharge. Will this arrangement solve my problem? Should I add any more elements to it?

    Additional information:
    1. Radio supply voltage is of course 12V, but unfortunately I can not find anywhere about the tolerance of voltage changes
    2. Radio power: 4x45W
    3. What is all this for? For two reasons. First: Fiat ignition has only 3 states, not 4 other states like in other cars. This means that when extinguishing the engine, I always disconnect the ignition and radio supply voltage. Secondly: the radio is on Android and its launch time is about 35 seconds, so every time I turn off the car I need 35 seconds to restart the radio. In addition, the radio works as a central unit on which the navigation, reversing camera, road recorder and Torque are activated, so waiting for a restart is simply extremely bothersome.

    Thank you in advance for your help and best regards,
    MM

    Hello,
    And you haven't thought about some simple microcontroller (plus voltage divider) that will monitor the voltage in the electrical system. In the event of a voltage change from 14.4V to 12V (or less), the controller starts the timer (set by you in the program / potentiometer) after which it cuts off the power supply to the radio to the radio.

    Regards!
  • #7 16523328
    Zbigniew 400
    Level 38  
    Feed the delay circuit through the diode and then the electrolytic capacitor.
  • #8 16523365
    web69
    Level 33  
    Are you looking for a hole in the whole ... most car receivers turn off temporarily during engine start-up and this is not a malfunction. The radio is to turn off if the supply voltage drops below 10.5V
  • #9 16523569
    marianmaciag
    Level 7  
    Quote:
    And you didn't think about some simple microcontroller (plus voltage divider)

    The microcontroller probably won't solve the problem of voltage drop during tanning.

    Quote:
    Feed the delay circuit through the diode and then the electrolytic capacitor.

    This is what the attached system looks like. I have a problem with the correct selection of parameters, e.g. capacitor capacity.

    Quote:
    Looking for holes in all ...

    I would agree, because in my previous car it didn't bother me, but my current radio starts for over 30 seconds, and it annoys me already.
  • #10 16524013
    Zbigniew 400
    Level 38  
    You have to choose experimentally.
    Another solution is a 1.2Ah gel battery, also powered by a diode. He should manage.
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  • #11 17748854
    mas444
    Level 14  
    Hello.
    My question is a little bit different, but I didn't want to start a new topic.
    Well, I installed a multimedia station in the car, which has the feature that it starts automatically when power is supplied to the ignition switch. Meanwhile, the car has the feature that it cuts off the radio power when the engine starts. The result is that when the ignition is switched on, the radio starts, and then turns off for the starter.
    How to get around this?
    - install a small gel battery to support the radio? Only if the radio does not discharge it overnight, or several days of not using the car.
    - give a plus directly from the car battery?
    - install the switch and manually turn on the radio only after starting the engine?
    - to regret and count on resistance and good quality of the radio?
  • #12 18405858
    Robert180388
    Level 9  
    How would you charge this extra gel battery because I have the same problem, if it drops to 10.5 then the car will not start I now have a protection that holds up to 11.5 but shortly and disconnects the radio after half an hour. I think I just put an extra gel battery but I have no idea how to charge.
  • #13 18406226
    mas444
    Level 14  
    The additional battery will be charged, because in the entire installation during operation the engine is 14.5V. A small rechargeable battery does not need to be charged as much time as the one under the hood.
    I made an additional switch and turn on the radio after starting the engine.
  • #14 18406647
    gradek83
    Level 42  
    marianmaciag wrote:
    When the ignition is turned off, the radio plays for a certain period of time, but during firing the voltage drops and the radio restarts.

    The momentary voltage drop on the battery is too great and the radio goes off.
    marianmaciag wrote:
    Secondly: the radio is on Android and its launch time is about 35 seconds, so every time I turn off the car I need 35 seconds to restart the radio

    Take a look here .

    About time switches except the relay that a colleague has already found.
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  • #15 18406675
    Strumien swiadomosci swia
    Level 43  
    marianmaciag wrote:
    Secondly: the radio is on Android and its launch time is about 35 seconds


    Most likely you have swapped 2 power cords or you did not pull the ignition switch cable in the Fiat which was not supplied at the factory because the radio got a ignition switch on CAN.
  • #16 18408233
    Robert180388
    Level 9  
    Can you write me what battery you have (type, link)? How much support does you have on it, because I am drawn to support 1A.

    Added after 25 [minutes]:

    https://obrazki.elektroda.pl/6843311400_1579248301.jpg

    Added after 1 [hours] 4 [minutes]:

    If I had an additional 9Ah, he will charge me on the 20 km route?
  • #17 18425170
    nyquist
    Level 26  
    Although the subject is a delicate "excavation", but the problem with the radio turning off during engine start and the idea of the author of the topic to extend the duration of the radio after turning off the ignition inspired me so much that I came up with the system:
    - Maintaining Car Radio Power for 15-30 Minutes After Ignition Off: Implementing Shutdown Delay
    A capacitor [C] of 1000 uF would allow (estimated, I did not check in reality) the operation of the radio for about 30 minutes.
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Topic summary

The discussion revolves around maintaining car radio power for 15-30 minutes after the ignition is turned off. The original poster seeks solutions to implement a shutdown delay for their car radio. Two main ideas are proposed: using a capacitor for a shutdown delay and modifying the power supply configuration. Responses suggest various methods, including connecting the radio's ISO pin to a permanent power source, utilizing a time relay (3SRP15005+), and employing a microcontroller to monitor voltage changes. Issues with voltage drops during engine start are highlighted, with suggestions for using a gel battery or additional capacitors to buffer the power supply. The conversation emphasizes the need for precise component selection to ensure reliable operation without interruptions.
Summary generated by the language model.
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