Single choke coil does the job of three components

23 February 2005 Circuit & System Protection

With Murata's new choke coil, conducted and radiated disturbance can be suppressed with use of only one component instead of three. Murata's hybrid choke coil (HCC) is both a common mode and a differential mode choke, which provides better noise suppression at frequencies above 30 MHz than discrete filters for each mode.

Today, these noise forms are a significant problem in lighting devices and household digital appliances. Until now, suppressing these noise sources required three components, a common mode and a differential mode choke coil for line conducted noise, plus a high frequency common mode choke for radiated noise. Switched mode power supplies, lighting ballast, medical equipment and audio products are among the obvious applications for this new invention.

Three components represent both cost and space problems. This is eased with the new PLY17 range of HCCs in a 24,5 x 22,5 mm package that is only 12,5 mm high. There are 10 common mode inductance values between 1,0 and 9,3 mH. Each value has a standard and a high performance version, the latter having a higher differential mode inductance, allowing optimum matching of component to the noise generated, and giving the designer 20 options.

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