power supplies

  1. L

    LM317 no reference voltage

    Hello all, This is my first post so forgive me if I break any rules, I am trying to create a variable voltage power supply using an lm317 but am running into problems. For starters, it doesn't seem that I have a vref voltage, when probed I get 0 volts across input and adjust. My second problem...
  2. ronit991

    Better approach for powering up sensor nodes ?

    I have a sensor node containing an MCU & radio running at 3.3 V and a sensor running at 5 V. What is the better approach for powering up the system (in terms of efficiency, stability, etc.) : 1. High Voltage Battery + Buck Converter or 2. Low Voltage Batttery +...
  3. V

    NCP1027 ATX power supply custom PCB not working

    I am newbie in AC supply PCB design. I have designed the PCB similar to NCP1027ATX evaluation board link. This is the link to pdf of my board schematic. The problem is that, at the output, the voltage is fluctuating and so that the microcontroller and other circuitry at the output not working. I...
  4. A

    SMPS POWER SUPPLY issue help needed

    Hello i am an engineering student working on a project of Switch mode power supply with outputs of 12V 1Amp .For this reason i have used power integration software to design smps supply circuit *(Schematic attached )with 12V 1 Amp required outputs. I have implemented this Circuit on PCB as...
  5. J

    Tips for bipolar power supply

    Hello, I need to design a linear regulated supply to power an dac output stage based on op amp. It must be a negative + ground + positive one. The problem I encounter is that I don't know wich topology to select between the first and second arrangement. I suppose that the first one induce a...
  6. emreanilterzioglu

    SMPS Vcc is not generating

    Hi guys, I am working on 12V 30A smps that has only 1V output. I haven't got board's schematic but I found one same like mine( Schematic Link). I measured high voltage capacitors (C2 and C3 on the schematic.) and bridge rectifier. They are working. Also checked power switching transistor on...
  7. L

    fixing possibly a bad power supplies board of a LED TV

    Suppose you have a bad LED TV with its power supplies board damaged. And this board is no longer available for sales. So how should you choose another similar power supplies board to replace it. What specifications you need to look at?
  8. Rahulk70

    Identifying the input power leads of a salvaged UPS transformer for projects

    Hello everyone, I'm writing this post mainly to help others who have had asked many questions in the past how to figure out the input supply leads (115V or 220V AC wires) on a salvaged UPS transformer. These transformers from a UPS are quite bulky and quite powerful and can be very useful in...
  9. S

    Calculating secondary turns on transformer

    I am designing a transformer for a high voltage converter. The topology is a push-pull converter. My method is to have a 200V primary generate 4x750V secondary windings, each feeding a voltage multiplier to generate 1500V. Then connect these in series and generate the final 6kV. So far I have...
  10. Lambo Av

    How to shut down a wind power plant?

    Just curious, how do they shut down those wind power plants given their tall structure? What are the procedures to do it? Thanks.
  11. Lambo Av

    How to shut down a hydroelectric power plant generator?

    Was cycling near a hydroelectric power plant generator with my sister and she asked me if they can be shut down. I said "Yes, all power plant generators can be shut down". I wasn't sure, so here I am to get some inputs on the safety procedures from AAC readers. Thanks. Any input is appreciated!
  12. Oriolly

    Lab Programmable Power Supply with C Library/headers for drone benchmark

    Hi everyone and sorry if this is the wrong section. I have a problem findings the correct piece of power supply.. What I need: A power supply I can connect at home (220VAC, 50/60hz) Output Voltage/Current enough to Power at least 1 ESC + brushless motor + propeller Up to 15 V output Up to...
  13. Jamiel92

    Alternative open frame power supply solutions?

    After my initial newbie post, I have decided I want to use an open frame power supply for my project. (Low power fan heater) I have looked at a few and I'm not sure whether I am either looking incorrectly or what I am looking for is just out of my price range and a cheaper option doesn't exist...
  14. R

    Arduino Mega 2560 controlled MPPT charge controller for small wind turbine.

    I am in the process of designing a MPPT controller for a wind turbine. There are plenty of MPPT boards (with BQ24650 MPPT charge controller ICs) but these are fixed voltage MPPT designs tailored for photovoltaic applications. So I decided to make a simple DC converter (buck boost design, non...
  15. C

    Power Supply Design question

    Hi all, I am new to power suppl design at the workplace when it comes to SMPS modules. Lately I have been wondering where my knowledge comes in to use when designing power supplies. This is because whenever I find a controller IC for whatever DC-DC converter I am designing, they already have a...