A DC power source unit supplies a DC voltage to an electrically powered tool through an adapter and also charges a battery pack used as an alternative power source of the tool. With the DC power source unit of the invention, a microcomputer receives a temperature signal indicative of a temperature of...http://www.google.co.uk/patents/US6683439?utm_source=gb-gplus-sharePatent US6683439 - DC power source unit with battery charging function
