EMI Suppression Filters (EMC and Noise Suppression)Case: Ensuring compliance of LED bulbs with noise standards

Our business is contingent on making components for products that must comply with domestic and overseas standards. What solutions have been selected by leading manufacturers?

Keys of solutions

  1. Coming up with a solution that specifically addresses “suppressing noise in LED lighting”
  2. Utilizing fully the human resources, equipment, and products that meet the noise standards of Murata and clearing the “radiation noise” levels required to comply with international standards
  3. Taking steps such as reviewing the design of some circuits, creating end products with only marginal cost increases, and winning the competition

“What’s the secret strategy for complying with international standards while keeping costs down?”

The engineers at Company N, who were engaged in repeated trial and error efforts in order to satisfy the “radiation noise” levels, spoke about the circumstances they were facing with a sales agent with whom the company had been doing business for other components. The agent happened to mention that Murata might possibly be of some use, and he introduced the two companies.

What’s the secret strategy for complying with international standards while keeping costs down?

When contacted, Murata described, from among its numerous noise suppression solutions, its “solutions for suppressing noise in LED lighting,” which have been the subject of an increasing number of inquiries. In regard to noise suppression measures for ensuring compliance with “radiation noise” levels under international standards, which are expected to be enforced in the future, it suggested carrying out various verifications by having prototype products brought to Murata and placed in Murata’s anechoic chamber.

In the anechoic chamber, Murata carried out evaluations and checks for the “noise terminal voltage” that had already been successfully suppressed. This confirmed that there were no problems in this respect, and after ascertaining the characteristics of the LED bulbs made by Company N, Murata instigated measures to ensure compliance with “radiation noise” standards.

As a result, it was found that the design of some circuit components would need to be reviewed and that the standards could be satisfied by using noise filters where they were needed. The required action was achieved with only a slight cost increase.

Teaming up with Murata, a competent partner, paid off, and Company N was able to ascertain how to make the products concerned at a low cost and ahead of schedule. As a consequence and with a higher level of quality added to the results achieved, the company won the competition.

Solutions that were the key to resolving these issues

We will now present a noise suppression solution where a noise filter is used in the DC line immediately after the bridge diode.