Black Decker Inc.

Thomas C Kohler

Geoffrey Stephen Howard

Daniel Lee Schwarz

Snehal S Choksi

Jiunping Huang

Richard A Sy

Minghuang Hung

Keith Hopwood

Chun-Te Chin

A power supply apparatus is provided including a housing, at least one battery receptacle for receiving at least one removable battery pack, an inverter that converts a direct-current (DC) signal from the at least one battery pack to an alternating-current (AC) signal, and a controller that applies a pulse-width modulation (PWM) signal to the inverter to shape the AC signal with a lower harmonic distortion relative to a square wave. For each full cycle of the AC signal, the controller sets the duty cycle to approximately 100% within a first period corresponding to a peak area of the AC signal, to less than approximately 100% but greater than approximately 0% within a second period in which the AC signal transitions from the peak to a zero-cross following the first period, and to 0% within a third period corresponding to the zero-cross of the AC signal following the second period.

Portable power supply

The present disclosure is directed to a portable power supply system for providing power to corded power tools. The portable power supply is configured to charge a plurality of battery packs in parallel from an external power supply. The portable power supply is also configured to discharge the plurality of battery packs in series to an output connectable to a corded power tool.

The present invention is directed to a portable power supply system. The system is capable of converting DC power from one or more removable, rechargeable battery packs to AC power for corded power tools and appliance. The system is also capable of receiving AC power from an AC power supply and converting the AC power to DC power and using the DC power to charge the removable, rechargeable battery packs. The system includes a heat sink to assist in dissipating heat generated by various electronic components in the system. The heat sink also serves as a structural element to provide structural support to a housing of the system.

Growing community of inventors

Bel Air, MD, United States of America

Thomas C Kohler