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PDF ECO7213 Data sheet ( Hoja de datos )
| Número de pieza | ECO7213 | |
| Descripción | Design of HF Wideband Power Transformers | |
| Fabricantes | Philips | |
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APPLICATION NOTE
Design of H.F. Wideband Power
Transformers; Part II
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1 page  
Philips Semiconductors
Design of H.F. Wideband Power Transformers; Part II
ECO7213
First we determine the normalized stray-inductance:
Lsn = ω-----m----aR--x---1-×-----L---s- , in which ωmax must be equal to or higher than 2π times the maximum frequency to be handled.
With the aid of Fig.5 we find the maximum input V.S.W.R (S) and the normalized correction capacitance (C1n). Then
C1 and C2 can be calculated:
C1 = ω-----m----aC--x--1--×-n----R----1- and C2 = n2 × C1
A practical problem that can arise is that the capacitor across the low-ohmic winding must have such a high value that it
approaches series resonance with its own lead inductance. In that case a sufficiently large number of smaller capacitors
must be connected in parallel.
The practical limit to which the above described compensation system can be used is appr.:
Lsn = 1
If the stray-inductance is larger a more complicated compensation system is required. The above described system is
based on a 3-element Chebyshev low-pass filter, but this can be extended to a 5-element network, which means that for
the compensation 4 elements are required. This situation is depicted Fig.3.
handbook, halfpageL1
Ls TR
R1 C1
n:1
L2
C2 R2
MGP979
Fig.3
Two inductors (L1 and L2) have been added. The normalized elements versus the maximum input V.S.W.R. (S) have
been given in Fig.6 (this graph and that of Fig.5 have been made with the aid of a computer program which is based on
the design formulae for Chebyshev low-pass filters as can be found e.g. in Ref. 3.). From this graph it can be seen that
Lsn may be as high as 1.77 for Smax = 1.2. A good practical limit is: Lsn = 1.6
The procedure for calculating the compensation elements is very similar to the previous case. We start again with
determination of the normalized stray-inductance: Lsn = ω-----m----a-R--x--1--×----L----s-
With the aid of Fig.6 we find the maximum value of S and the normalized values of the correction elements C1n and L1n.
Now C1 and L1 can be calculated: C1 = ω-----m----aC--x--1--×-n----R----1- and L1 = L----1-ω--n--m--×--a--R-x----1-
1998 Mar 23
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ECO7213.PDF ] | |
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