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    Length: 2432 (0x980)
    Types: RcTekst
    Names: »99110087.WP«

└─⟦7fab0c8ae⟧ Bits:30005866/disk3.imd Dokumenter i RcTekst format (RCSL 99-1-*)
    └─⟦this⟧ »99110087.WP« 

RcTekst

╱04002d4e0a00060000000003014131400000000000000000000000000000000000000000000000000a0f19232d37414b555f69737d8791ff04╱

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┆14┆┆b3┆┆06┆┆0b┆↲
┆b0┆POW502↲
↲
100 W ┆84┆Series resonant mains switched powersupply. ↲
↲
      Specifications:↲
↲
      U in:  220 Volt    200 min↲
╞	╞	╞	 250 max↲
╞	    fmin =  45 Hz↲
╞	    fmax = 500 Hz↲
↲
      U out: +5V adjustable within ┆a1┆+┆e1┆5%↲
             +12V fixed tolerance ┆a1┆+┆e1┆10%↲
             -12V fixed tolerance ┆a1┆+┆e1┆10%↲
↲
      I out: +5V  max 20A↲
             +12V max  8A↲
             -12V max 0,1A↲
↲
      Ptot out: max 100W↲
↲
Functional description.↲
↲
Referring to the blockdiagram, the Powersupply contains 4 ↓
sections:↲
↲
╞	1 the mains rectifier↲
╞	2 the switcher↲
╞	3 the series resonator and powertransformer↲
╞	4 the secondary rectifier↲
↲
1. ┆84┆The mains rectifier contains noisefilter, rectifier bridge and ↓
┆19┆┆83┆┄┄primary storage capacitor.↲
↲
2. ┆84┆The switches is composed by an oscillator with a frequency ↓
┆19┆┆83┆┄┄controlled via an optocoupler by the voltage control on the ↓
┆19┆┆83┆┄┄+5V secondary section.↲
↲

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↓
   ┆84┆The oscillator frequency increases with increasing current in ↓
┆19┆┆83┆┄┄the optocoupler.↲
↲
   ┆84┆The oscillator derives two MOSFET power transistors generating ↓
┆19┆┆83┆┄┄a 310 volt peak to peak square wave of app. 100 KHz. This ↓
┆19┆┆83┆┄┄squarewave is fed into the resonance circuit.↲
↲
3. ┆84┆The resonance circuit has two functions:↲
↲
   a. ┆84┆to smooth out the squarewave and thereby reduce the common ↓
┆19┆┆86┆┄┄mode noise generated by the switcher over the ↓
┆19┆┆86┆┄┄powertransformer.↲
↲
   b. ┆84┆to transform the variable amplitude squarewave (varying ↓
┆19┆┆86┆┄┄with mains voltage) to a constant voltage sinuswave, the ↓
┆19┆┆86┆┄┄amplitude of which is controlled by means of the ↓
┆19┆┆86┆┄┄oscillatorfrequency: As the frequency decreases approaching ↓
┆19┆┆86┆┄┄the resonant frequency, the amplitude increases.↲
↲
4. ┆84┆The secondary section is divided in a 5 volt and a 12 volt ↓
┆19┆┆83┆┄┄part. In both the series inductor is large enough to ensure ↓
┆19┆┆83┆┄┄that current flows constantly in the rectifier diodes. 5 volts ↓
┆19┆┆83┆┄┄is derived as the commutated mean voltage on the corresponding ↓
┆19┆┆83┆┄┄secondary winding. 5 volt is regulated by feedback to the ↓
┆19┆┆83┆┄┄oscillator via the optocoupler. Plus and minus 12 volt are ↓
┆19┆┆83┆┄┄regulated in series regulators.↲
↲
   ┆84┆The power ok circuit is activated when the 5V voltage is high ↓
┆19┆┆83┆┄┄enough for the power input to be reduced (when current begins ↓
┆19┆┆83┆┄┄to flow in the optocoupler).↲
↲

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┆1a┆┆1a┆┄┄enough fo