COSEL科索公司成立于1967年，是日本第二大的电源生产商，原名ELCO公司，1992年正式易名为COSEL科索公司，1993年及1999年分别获ISO9001和ISO14001认证, 现时拥员工三百多人，年销售额12亿美元。1994年在日本股票市场上市，资产增至二千零五十五亿日圆。COSEL科索公司在富山及立山市设有工场，所有产品全部原装日本制造，大部份生产功序采用全自动化，特别着重于品质控制。

对于工业用或者民用的电子设备来说，需要使用很多以半导体制品为代表的电子零部件。IC（集成电路），FET（场效应晶体管），晶体管，二极管等半导体制品，必须对其提供稳定的直流电才能使它们正常工作。换句话来说，从电厂输送给各个工厂或者每户家庭的交流电，将其转化成稳定的直流电是非常重要的一步。而实现这种转化的，正是COSEL科索的直流稳压电源。

开关电源因其体积小，质量轻，效率高等特点，被广泛使用于以通信设备、医疗设备和工业自动化设备为代表的电子设备上。其中利用半导体高速开关作用的开关电源正是COSEL科索的主力产品。COSEL科索拥有50年的历史，并且在日本标准开关电源市场份额占据第一。另外，从2005年起，COSEL科索也开始生产用于保护电子设备免受各种噪音干扰的滤波器。

现在，围绕社会发展和生活的产品，绝大多数都已经电子化，其中最为重要的开关电源，可以说是发展前进的关键。对于COSEL科索来说，不断探索寻求新的技术，持续生产那些构筑美好的电子化未来的产品，正是我们一如既往的使命。

Cosel is one of the leading power supply manufacturers with a history of 50 years. Cosel manufactures high-quality AC-DC power supplies, DC-DC converters, power modules and EMI filters.

A range of electronic components, including semiconductors, are used within electronic products such as industrial and consumer equipment. Semiconductor devices such as IC, FET, transistors, diodes, etc. operate based on a stable DC power supply. In other words, it is vital to convert the AC current supplied to plants and households into a stabilized DC current. COSEL's DC-stabilized power units help to realize this.

In particular, COSEL's "switching power supply," which utilizes the high-speed switching effect of semiconductors, is one of our major products. Switching power supplies are compact, lightweight and highly efficient, which means that they are now used in almost all electronic devices, including in information communications, medical and factory automation devices. COSEL has been engaged, furthermore, since 2005, in the production of a noise filter that protects electronic equipment from a range of noise, and have now released a product using that technology.

Nowadays almost all the products that are available in society and used in our daily lives utilize electronic technology, and as such, the DC-stabilized power unit holds the key to the future. At COSEL, we are engaged in endless discussions with new technology, in order to build high levels of reliability into future products.