FSM
DC FILTERING 1) RECOVERY OF G.T.O. SWITCHINGENERGY
Typical application Choice of voltage:
Important V
1 V
n dc Due to the modular nature of these
capacitors series and parallel assemblies can be made to increase the
capacitance and/or voltage.Ensure that suitable sized connections are used so thatthe capacitors will not be overheated. The inductance of the connections must be low enough to ensure equal
current sharing of capacitors in parallel.For series assemblies, connect across each capacitor aresistor of valueR # 30 M Repetitive surge: 1.1 V
n dc – 1/3 of the time Non-repetitive surge: 1.3 V /C in µF(1.5 M
n dc – 1 min./day for C = 20 µF). Occasional max. surge: 2 V
n dc – 100 ms/day for V
n dc = 1150 V1.75 V
n dc – 100 ms/day for V
n dc = 1350 V RMS current limits: The currents given in the tables are maximum. The thermal limits of the dielectric (85°C) must be respected.The self-heating can be calculated from the series resis-tance, Tg and the thermal resistance given in the table of values Ø = P x Rth 85°C - Ø ambientRth: is given for still air with the capacitor not being subjected to any other heat source.
2) DCFILTERING
Idem paragraph 1. P = (I
CnVndcIrms*(I 2 .t) max.Tg δ âžž kHz)(m Rs(µF)(V)maxi.*(A (A)(10 2 s)(f -4 ) )References rms )
2 x R
s +
2 -4 2x C (V
1 - V
2 ) x frx 10
547501052702 + 3.4 f1FSM26A0546K-- Temperature measuring point*
429001002202 + 2.8 f1.05FSM26C0446K-- Measurement of the case temperature ( B) togetherwith the losses gives the temperature of the hot spot.
331000951702 + 2.3 f1.1FSM26L0336K-- 281150851502 + 2 f1.15FSM26U0286K--201350651002 + 1.6 f1.25FSM26V0206K-- = (RthB x P) + B 85°C*Important for series/parallel operations. Table of Values
*Function of power dissipation 26