HARDWARE CONTROL FOR PREVENTION OF DANGEROUS RESTART IN A POWER TOOL

A power tool including a power supply interface, a motor control circuit configured to regulate supply of power from the power supply interface to a motor, and an input unit actuatable by a user. A no-volt prevention circuit receives a first voltage signal from the power supply interface and a secon...

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Bibliographische Detailangaben
Hauptverfasser:	Kowalski, Michael J, Hasan, Nazmul, Rahnamaee, Arash, Kumar, Vivekkumar
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDEDFOR DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOTPARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOTOTHERWISE PROVIDED FOR HAND TOOLS MANIPULATORS PERFORMING OPERATIONS PORTABLE POWER-DRIVEN TOOLS TRANSPORTING
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Beschreibung
Zusammenfassung:	A power tool including a power supply interface, a motor control circuit configured to regulate supply of power from the power supply interface to a motor, and an input unit actuatable by a user. A no-volt prevention circuit receives a first voltage signal from the power supply interface and a second voltage signal from the input unit. The no-volt protection circuit includes a main semiconductor switch arranged on a current path from the power supply interface to at least one component of the motor control circuit, and a resistor-capacitor circuit to turn the main semiconductor switch ON when the input unit is actuated after the power supply interface is coupled to the power supply, but not when the input unit is actuated before to the power supply interface is coupled to the power supply.