| 摘要 |
PROBLEM TO BE SOLVED: To obtain a noise filter for a heating cart, which can be improved in noise reduction efficiency and accuracy, which can surely reduce, absorb, and remove noise, meet an EMI prevention specification and standard, and readily and easily satisfy the specifications and standards. SOLUTION: A noise filter B is connected to a three-layered four-wire AC power source circuit S of a heating cart provided with electric parts, such as heaters, etc. The filter B is provided with coils L, which are respectively connected in series with wires U, V, W, and N, respectively provided with exclusively used magnetic bodies M, and reduce noise mainly in a high-frequency range, resistors R which are respectively connected between the three power lines U, V, and W and neutral line N and can reduce noise in the high-frequency range, and first capacitors CX which are respectively connected between the power lines U, V, and W and neutral line N and reduce noise in an intermediate to low frequency range. The filter B is also provided with second capacitors CY, which are respectively connected between the lines U, V, W, N and a ground E and reduce noise in the intermediate to low frequency ranges.
|
