Search:

Type: Posts; User: Easy peasy

Page 1 of 20 1 2 3 4

Search: Search took 0.02 seconds.

  1. Replies
    10
    Views
    201

    Closed: Re: 230VAC PWM LED bulb dimmer

    What happens when you include C8...?
  2. Replies
    10
    Views
    201

    Closed: Re: 230VAC PWM LED bulb dimmer

    might be a good idea to break one open and draw a schematic of the inside - could be quite helpful...
  3. Replies
    10
    Views
    201

    Closed: Re: 230VAC PWM LED bulb dimmer

    What electronics are inside the bulb? - just LED's in series or ...? ?
  4. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    So, you want to patent the improved buck converter ? I can't quite see the "inventive step" - legal term - that you have created here ...?

    24V to 12V buck converters ( dual fet ) with...
  5. Replies
    6
    Views
    183

    Closed: Re: push pull ac-dc auxiliary winding.

    also note if you are rectifying 230V mains the push pull fets will see > 650Volts - so 800V min required ...
  6. Replies
    6
    Views
    266

    Closed: Re: Wht is the purpose of this op amp

    PWM -> DC value converter ... with lower output impedance to drive the secret load ( lower than the 4k7 resistor used on the filter ...)
  7. Replies
    6
    Views
    183

    Closed: Re: push pull ac-dc auxiliary winding.

    Auxiliary power supply once the push pull starts - what powers the chip to provide the gate drive at cold start is not shown / not drawn / not provided in the schematic - likely an unfinished ...
  8. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    ... and ... does it work in sim ... ?
  9. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    2 x 600V diodes with small snubbers across each, 47pF & 470 ohm should make the sim go ...

    - - - Updated - - -

    for 1kV in you probably want to keep the sw freq to 50kHz, or even less, ...
  10. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    If you were going to do 2 x buck stages - you would have the same gate drive to each stage, this would give 1kV:220V:48V naturally

    Using SiC you could synch rect both stages ( only 48V ...
  11. Replies
    14
    Views
    496

    Closed: Re: AC-DC power supply design

    you run the risk of frying the igbt - try a relay ...

    - - - Updated - - -

    p.s. you only need one triac - the other is redundant - also the thermistor could be 2 x 10W 68E resistors in...
  12. Closed: Re: LLC converter vs Dual cascaded Buck….1000V to 48V at 500W output…no isolation ne

    1000V to 48V, I would do this with 2 x 800V H bridges in series ( we have done up to 4 in series for 3.8kV in, 350Vout 40A )

    I would use a series resonant converter ( not LLC per se ) ...
  13. Replies
    9
    Views
    539

    Closed: Re: BJT amplifier design

    are we doing home work for students now ... ?
  14. Replies
    3
    Views
    264

    Closed: Re: "Current adds up in phase"

    if you have 2 equal currents 180 deg out of phase in a wire - the net current is zero - if there are in phase then the current is 2x - this is why knowing the phase relationship is...
  15. Replies
    3
    Views
    229

    Closed: Re: SMPS for 5000W can be a Full Bridge

    There are a lot of hard switched H bridges up to 3.5kW ( and well above actually ) usually 20kHz for above 3.5kW and up to 50kHz below 3.5kW

    for a compact design - read less heatsink - ...
  16. Closed: Re: Testing Amps on rewound microwave transformer

    ... ... ... .
  17. Closed: Re: convert voltage control to current control

    There is - or should be - no contradiction - you can use a very small amount of current mode control in an half bridge ( but not too much ..! - the rest of the ramp comes from Vin - suitably...
  18. Closed: Re: Testing Amps on rewound microwave transformer

    The current needs to be limited by a suitable load on the output of the Tx - if you apply a too low ohm load you will overload the Tx, this is what fuses and polyfuses & circuit breakers are for ...
  19. Closed: Re: Testing Amps on rewound microwave transformer

    also the pri of a uWave Tx has fewer turns than a conventional Tx - it runs very high peak flux and high peak magnetising current - as a result they hum loudly

    you cannot connect an ammeter...
  20. Closed: Re: Earth leakage Detection "positive" as well as "Negative" >30mA.

    here you go :-157368
  21. [SOLVED]Closed: Re: LoopGain analysis with multiple feedback loop

    @ The Electrician - they are resistors -
  22. Closed: Re: Need to reduce drain voltage spike in LM5019 Buck converter

    if you short your "probe" on the Vin line and still see the spikes - you know it is the probing system - you can subtract the artifact spikes from the signal.

    you can also short your probe on...
  23. Closed: Re: Need to reduce drain voltage spike in LM5019 Buck converter

    could be partially your scope - see how you have a spike on the current - where no spike should be - e.g. at turn off the current simply cannot jump high - so there is some artifact on your...
  24. [SOLVED]Closed: Re: Need very basic R-C "delay off" circuit

    yes - for a fast turn on the diode points to the base of the Darlington, i.e. cathode to base ...
  25. Closed: Re: Earth leakage Detection "positive" as well as "Negative" >30mA.

    you set up a balanced 30mA using a class B amp structure with the earth in the middle - that way if either the + or - is pulled to earth by more than 30mA a resistor volt drop can be used to...
Results 1 to 25 of 500
Page 1 of 20 1 2 3 4