Power-One Inc. said Friday that Silver Lake Sumeru had completed a $56 million investment in the Camarillo power conversion technology company.

Kyle Ryland and Ajay Shah of Silver Lake Sumeru, a Cupertino fund targeting middle-market technology companies, have joined the Power-One board, the company said.

The transaction before expenses was $60 million. Power-One designs and manufactures energy-efficient power conversion and power management devices for computer, alternative/renewable energy and other devices.

The company’s shares closed down 4 cents, or 3 percent, to $1.26 on the Nasdaq.