ES030-10 DELTA ELEKTRONIKA BV
Rev. Sept. 2012 DESCRIPTIONS Page 3 - 1
Cir cuit de scrip tion
The in put volt age is rec ti fied by a bridge rec ti fier. A boost-type con verter con verts this volt age to about
370 V. The power fac tor con trol cir cuit forces the line in put cur rent to be sine-wave.
With an NTC re sis tor of 16 Ω cold re sis tance the in rush cur rent is lim ited. Af ter switch on, the re sis tance of the NTC
de creases rap idly and causes only a small loss dur ing op er a tion.
The pulse width reg u lated switcher is a 100 kHz for ward con verter. Much at ten tion has been paid to the safety of in -
put-out put iso la tion. At the vi tal sep a ra tion points split bob bin trans form ers are used.
At the out put multilayer ca pac i tors are used in stead of elec tro lytic ca pac i tors. This makes it pos si ble to pro gram the
out put volt age fast (0 - 30 V in 1.5 ms) with out lim i ta tion of the rep e ti tion fre quency.
The pro gram ming in puts and mon i tor out puts of volt age and cur rent are 0 - 5 V for 0 to full scale.
At Mas ter / Slave par al lel op er a tion the cur rent mon i tor out put of the mas ter drives the cur
rent pro gram ming in put of
the slave. The re sult is equal cur rent shar ing.
At Mas ter / Slave se ries op er a tion a volt age equal to the volt age mon i tor out put of the mas ter drives the volt age pro -
gram ming in put of the slave. The re sult is equal volt age shar ing.
RFI fil ters at in put and out put pre vent ra dio fre quen cies, gen er ated by the switcher, to be con ducted to the line or to
the load. It also pre vents in ter fer ence from out side to en ter into the power sup ply cir cuits.
Ra di ated RFI is also very low be cause of the closed metal case.
Sim pli fied func tional di a gram
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