| abstract |
[PROBLEMS] To reduce the cost of a noise removing member, reduce the noise voltage level (electromagnetic interference terminal voltage level), reduce the switching loss of the power supply, and reduce the cost of the radiator. The object is to provide a charging device. A charging device for charging a battery of a portable power tool, wherein a primary main winding to which a DC voltage obtained by rectifying and smoothing a commercial AC power supply is input, and charging power for the battery are output. The secondary side main winding, the primary side auxiliary winding that outputs power to the switching control circuit that controls the main power of the charging device, and the power to the secondary side control circuit that controls the operation of the charging device A single transformer composed of a secondary auxiliary winding for output, and a noise suppression circuit configured by connecting at least one capacitor and at least one resistor in series, and the noise suppression circuit This can be solved by a charging device connected between the positive electrode side of the primary auxiliary winding and the negative electrode side of the secondary main winding. [Selection] Figure 1 |