Abstract: The present disclosure provides a charger for a battery pack. The battery pack includes a battery input line, a battery sense line electrically connected to the battery input line, and one or more electrochemical cells electrically connected to the battery input line. The charger includes a charger integrated circuit (IC) including an input pin, an output pin, and a sense pin. The charger further includes a charger output line electrically connected to the output pin of the charger IC. The charger output line is electrically connected to the battery input line upon coupling of the battery pack to the charger. The charger further includes a charger sense line electrically connected to the battery sense line upon coupling of the battery pack to the charger. The charger also includes an analog switch electrically disposed between the charger sense line and the battery sense line.

Abstract: A breathing apparatus includes a blower unit including a blower. The breathing apparatus further includes a battery pack including at least one electrochemical cell. The breathing apparatus further includes an adaptor including an adaptor housing physically connected to the blower unit and the battery pack. The adaptor further includes electrical contacts that engages with corresponding electrical terminals of the blower unit and the battery pack, such that the blower is electrically coupled to the electrochemical cell. The adaptor further includes at least one communication interface for receiving data from at least one of the blower unit and the battery pack, and transmitting data to an external device.

Abstract: According to one aspect of the invention, a motor control system for driving a motor for a powered air purifying respirator (PAPR) is provided. The motor control system includes a control printed circuit board assembly (PCBA) including a control processing circuitry and a motor drive PCBA in communication with the control PCBA and the motor. The motor drive PCBA includes a motor drive processing circuitry. The control processing circuitry is configured to configure the motor drive processing circuitry with at least one operating characteristic. The motor drive processing circuitry is configured to drive the motor according to the at least one operating characteristic.