| 摘要 |
A power supply, including a printed circuit board which has a structure in which a width is narrow and a height of electronic components to be mounted is restricted and on which the electronic components are arranged and connected, comprises an input capacitor which smooths a rectified input voltage and supplies a current to a switching circuit; a transformer which supplies energy to an output; an output rectification diode which rectifies a voltage outputted from an output terminal of the transformer; a first smoothing capacitor which smooths the voltage rectified by the output rectification diode; a Y capacitor which connects a primary electrical ground and a secondary electrical ground of the power supply; and the printed circuit board, on which the electronic components including the input capacitor, the transformer, the output rectification diode, the first smoothing capacitor, and the Y capacitor are arranged and connected, which has a restricted space in which the electronic components are arranged in a widthwise direction due to the narrow width and the restricted height of the electronic components, and which is mounted in the power supply. One side terminal of the Y capacitor is connected to an electric ground terminal of the input capacitor, and a separated connection wire is connected to a point adjacent to the electric ground terminal of the input capacitor to shorten a length thereof shared by a connection line which is connected to an electric ground of the input capacitor from the other components and drops a noise potential on a line. Accordingly, the noise potential difference can be reduced between the electric ground terminal of the input capacitor and the one side terminal of the Y capacitor, thereby reducing the occurrence of electromagnetic interference (EMI). |
