what is the function of this circuit

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • fauzanmint
    Senior Member
    • Jun 2018
    • 77
    • Indonesia

    #1

    what is the function of this circuit

    Hi can anyone explain the function of this circuit in the power section of many projector?
    I often find this section broken.
    Last edited by fauzanmint; 11-14-2020, 10:51 AM.
  • dick_barton
    Badcaps Legend
    • Aug 2015
    • 6643
    • Wales

    #2
    Re: what is the function of this circuit

    It boosts the incoming rectified voltage. Look up PFC circuits on the internet. There's plenty of information available.
    Willing to help but I'm no expert.

    Comment

    • fauzanmint
      Senior Member
      • Jun 2018
      • 77
      • Indonesia

      #3
      Re: what is the function of this circuit

      Originally posted by dick_barton
      It boosts the incoming rectified voltage. Look up PFC circuits on the internet. There's plenty of information available.
      Ok thank you

      Comment

      Related Topics

      Collapse

      • Alimash
        op amp circuit function?
        by Alimash
        Hi,
        I am repairing a ups which doesn't turn on ,it has the following ICs:
        SG3525 used to drive inverter mosfets.
        couple of uc3483, one for the power supply and another to drive a big mosfet at the output stage(i think the technique is called boost)
        A LM358 and TL074 for control mechanism and of course the uController.

        The SG3525 is shutting down every time the ups is turned on.
        I want your help to know the function of LM358 and TL074 in the system.
        I reverse engineered the LM358 circuit and i think that one of the block(A) is used for battery level...
        07-31-2025, 07:45 AM
      • sam_sam_sam
        1970 Metal Lathe Control Circuit blowing fuses on the 120 volt section failing meager test below 60 mega ohms
        by sam_sam_sam
        I was working on this machine yesterday and I now going to use an incandescent lights instead of a fuses to figure out what the issue is with it blowing control voltage rail but this not the only issue the coolant pump failed the meager test as well as the main motor as well this motor has 12 motor wire leads instead of the normal 9 wires

        This metal lathe has a weird motor setup it has a soft start motor with a “Y” and a delta type of motor winding setup and it is not done in the motor pucker head enclosure it is with four different contactors wired in a configuration I have not...
        12-29-2024, 07:18 AM
      • Document Archive
        Lenovo ThinkPad P51s + ThinkPad Stack Mobile Projector Mobile workstation P Specification for Upgrade or Repair
        by Document Archive
        This specification for the Lenovo ThinkPad P51s + ThinkPad Stack Mobile Projector Mobile workstation can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the P51s + ThinkPad Stack Mobile Projector boardview and P51s + ThinkPad Stack Mobile Projector schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum....
        09-06-2024, 06:11 AM
      • Astonished
        Fixing the Charge Circuit of the Batteries of the DC Motor
        by Astonished
        Hi friends of electronics

        What you see in the video and pictures attached is the circuit for charging the batteries of a DC motor.

        The problem is that this circuit cannot charge the batteries (3 1800mAH NiMH batteries) any more. When the circuit was OK, its green LEDs lit up one at a time to show that the batteries have charged more. But now that the circuit is flawed, LEDs light up as you see in the video and at the same time successive beeps are heard.

        Please help me fix this circuit.

        (the datasheet of the IC: https://pdf.datasheet.live/28...
        01-28-2025, 06:24 AM
      • piernov
        Reminder: rules and organization of this section
        by piernov
        Activity on this forum has been increasing steadily and the workload for the moderation team as well in order to keep the place clean, so please make an effort to keep it organized.
        I've been deleting more and more posts that make a mess, so take a minute before posting to make sure you make a proper request/offer.

        Reminder about the rules and the organization of the "Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals" section.

        This section and its subsections are about the following classes of devices:
        • Desktop computers
        • All-in-one
        ...
        03-31-2023, 06:17 AM
      • Loading...
      • No more items.
      Working...