公开(公告)号：US6087815A

公开(公告)日：2000-07-11

申请号：US965748

申请日：1997-11-07

Applicant: John Edward Pfeifer ,  James C. Boda ,  David M. Hoerr

Inventor： John Edward Pfeifer ,  James C. Boda ,  David M. Hoerr

IPC: B25F5/00 ,  H01M2/10 ,  H01M10/46 ,  G05F1/44

CPC classification number: B25F5/00 ,  H01M10/46 ,  H01M2/10 ,  H01M2/1005 ,  H01M2/1016

Abstract: A portable power system for a hand tool employs a high-voltage transmission of power from a battery pack over a cord to a DC to DC converter, which steps the transmission voltage down to rated tool voltage. The system uses a switching transistor to transmit power according to a duty cycle which varies automatically according to tool current draw and voltage. The DC to DC converter employs synchronous rectification with an inductor-capacitor network to transform a duty cycle square wave into DC power. The startup voltage sense feature permits powering up the converter circuitry only when needed. The converter will shut down if no current has been drawn by the tool for a predetermined period of time or if the converter unit is in danger of overheating, as determined by a stored algorithm. The portable power system has safeguards to prevent fouling or shorting in wet environments, is adaptable to left or right handed users, and is physically configurable into a variety of carrying modes.

Abstract translation: 用于手动工具的便携式电力系统采用从电池组通过电缆向DC至DC转换器的电力的高压传输，其将传输电压降至额定工具电压。 该系统使用开关晶体管根据工作电流汲取和电压自动变化的占空比传输功率。 DC-DC转换器采用电感 - 电容网络进行同步整流，将占空比方波变换成直流电源。 启动电压检测功能仅在需要时才允许转换器电路上电。 如果工具上没有电流预定时间段，或转换器单元处于过热危险中，则转换器将关闭，如由存储的算法确定的。 便携式电力系统具有防止潮湿环境中的结垢或短路的保护措施，适用于左手或右手用户，并且物理上可配置成各种携带模式。