DC POWER SUPPLY DEVICE OF ELECTRIC TOOLS

摘要

The present invention relates to a DC power supply device of an electric tool. The DC power supply device of an electric tool, which is miniaturized and lightened and converts AC power to DC power to drive a BLDC motor that is a driving source of the electric tool, comprises a first converter for converting an AC applied from AC power to a DC; an inverter which is connected to an output end of the first converter to convert the DC to the AC; a transformer which is connected to an output end of the inverter to be operated in a high frequency rather than a power frequency; and a second converter which is connected to an output end of the transformer and rectifies the transformed AC to the DC to be supplied to the DC power. According to the present invention, the conversion device which is a means for converting an AC to a DC can be miniaturized and lightened when a grinder is configured using the BLDC motor, and the conversion device and the electric tool can be connected to be used in a ratio of 1:1 or 1:n, thereby expansively widening the using range. [Reference numerals] (10) AC power; (20) First converter; (30) Inverter; (40) Transformer; (50) Second converter; (60) DC power