Title:
【発明の名称】コード使用/コード非使用の2モードの電力により作動される装置
Document Type and Number:
Japanese Patent JP2807011
Kind Code:
B2
Abstract:
A corded/cordless dual-mode power-operated device, such as a household vacuum cleaner, can be operated in corded mode from a conventional power source and in a cordless mode using energy provided from an internal rechargable battery and which includes an internal battery charger for recharging the battery when the device is in its corded mode. The internal charger includes a voltage converter that converts input source current to a relatively high DC current that is chopped at a comparatively high frequency, e.g., 25 KHz, by switching devices. The high-frequency, high voltage current is presented to a step-down transformer with the stepped-down output rectified to provide a low-voltage DC suitable for recharging the internal battery when the device is in its corded mode. The voltage converter advantageously provides for the high efficiency conversion of the input energy to meet the charging current demands of the internal battery in a physically compact device.
Inventors:
Bagwat, Pradeep M.
Elson, Donald E.
Walter, Richard Tee.
Elson, Donald E.
Walter, Richard Tee.
Application Number:
JP50331489A
Publication Date:
September 30, 1998
Filing Date:
February 23, 1989
Export Citation:
Assignee:
Black and Decker Incorporated
International Classes:
A47L9/28; H02J7/00; H02J7/02; (IPC1-7): H02J7/00
Attorney, Agent or Firm:
Aoki Akira (3 outside)