Comcokid
Electrical
- May 23, 2003
- 1,276
Common mode noise arises in switching supplies from the capacitance of the power devices to the heatsink (surface area, insulator thickness and dielectric constant) and the switching speed and waveform of the power devices.
An engineer I work with has seen a book or article that works one through the calculations step-by-step to approximate the common mode noise of a design - but he can't find it again. Having this kind of logical design approach would then allows the filter choke and X & Y capacitors to be selected.
There's plenty of burte-force design approaches available (put in a filter and measure where you're at "cut-and-try"). But does anyone know of a book, article, or website that uses a systematic, logical approach to the estimation and design of filtering for common mode noise in a switching device/supply?
An engineer I work with has seen a book or article that works one through the calculations step-by-step to approximate the common mode noise of a design - but he can't find it again. Having this kind of logical design approach would then allows the filter choke and X & Y capacitors to be selected.
There's plenty of burte-force design approaches available (put in a filter and measure where you're at "cut-and-try"). But does anyone know of a book, article, or website that uses a systematic, logical approach to the estimation and design of filtering for common mode noise in a switching device/supply?