Abstract: 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.

Abstract: 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.

Abstract: A commercial grade job site charging system is presented. The charging system may include a large container, for example a large metal box. The enclosure may be designed and configured to receive, via a temporary connection, relatively high input power, e.g., 480V, 3-phase, 60 A, for receiving a plurality of rechargeable, removable battery packs. The charging system may include a plurality of interior chargers of relatively lower power, e.g., 120V single phase, 15 A. The charging system may include a high power transformer to adapt the relatively high input power voltage to that of the lower power chargers. The charging system may simultaneously charge a plurality of battery packs, e.g., 32 battery packs.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.