A power tool for connection to ac mains via at least one residual current protective device

A power tool (PT) for connection to AC mains (20) via at least one residual current protective device (RCCD; PRCD) is disclosed. The power tool has a DC motor (DCM), a power factor correction unit (PFC) for converting AC mains power to DC power at a DC voltage higher than the AC mains voltage, and a...

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Bibliographische Detailangaben
1. Verfasser:	Rosén, Magnus
Format:	Patent
Sprache:	eng ; swe
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION
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Beschreibung
Zusammenfassung:	A power tool (PT) for connection to AC mains (20) via at least one residual current protective device (RCCD; PRCD) is disclosed. The power tool has a DC motor (DCM), a power factor correction unit (PFC) for converting AC mains power to DC power at a DC voltage higher than the AC mains voltage, and a motor frequency inverter (MFI) for driving the DC motor with DC power from the power factor correction unit and controlling the torque and/or the number of revolutions per time unit of the DC motor, The power factor correction unit (PFC) is configured to control the conversion of AC power to DC power such that in case of a ground fault (60) which causes residual current (I) in a protective earth line (PE), the residual current will have a waveform (80) lacking a smooth DC component.