.
Log in Register

Login to your account

Username *
Password *
Remember Me

Create an account

Fields marked with an asterisk (*) are required.
Maximum length of name and username fields is 16 symbols
Name *
Username *
Password *
Verify password *
Email *
Verify email *
Captcha *
Mobile menu
1 1 1 1 1 Rating 0.00 (0 Votes)

The plugin screen.
Calculate influence of shield on the inductance value.

shielded inductorShielded coil inductances most often used at high frequencies to guard the inductor from external electromagnetic fields. But the shield reduces self-inductance of the coil and its Q-factor, and also increases the parasitic self-capacitance, and it's, of course, undesirable effect. To reduce the derating of the coil under the influence of shield on high frequences - the shield diameter should exceed the diameter of the coil is not less than 1.6 - 2.5 times, and for stable high quality coils - 2.5 - 3 times. To estimate the degree of reduction of the inductance under the influence of shield Coil32 have a plugin that called "screen".

The calculation of the decreace of inductance due to the influence of the shield bases on the following empirical formula:shielded inductanceshielded inductor formula

where:

  • Ls - inductance of the shielded coil
  • L0 - inductance of the coil without shield
  • Ds - diameter of shield
  • H - height of shield
  • D - diameter of winding
  • L - length of winding

The formula is valid for cylindrical shield. In the case of a square shield in the input field enter the size of the side and then we can calculate the equivalent diameter, which is used in the above formula. The equivalent diameter is equal to average diameter of inscribed and circumscribed circles.

Add comment

Сomments from anonymous guests are enabled with moderation.


Screenshots 

Latest comments