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    • 9. 发明公开
    • FILTER CIRCUIT
    • EP3487023A1
    • 2019-05-22
    • EP18205768.7
    • 2018-11-12
    • Pegatron Corporation
    • Chi, CHANG
    • H02H9/00H02H9/04H02H9/06
    • A filter circuit (100, 200, 300) includes a signal input terminal (TEI), a gas discharging tube (110), a signal output terminal (TEO, TEO1), and a filter (120, 220, 320). The signal input terminal (TEI) is configured to receive a communication signal (XSS). The gas discharging tube (110) is coupled between the signal input terminal (TEI) and a natural ground terminal (GNDn). The signal output terminal (TEO, TEO1) is configured to provide a filtered communication signal (XSSf, XSSfl). The filter (120, 220, 320) is coupled between the signal input terminal (TEI) and the signal output terminal (TEO, TLO1). The filter (120, 220, 320) includes a first high voltage capacitor (HVC1), a second high voltage capacitor (HVC2), and a main filter element (LX1). The first high voltage capacitor (HVC1) is coupled between the signal input terminal (TEI) and an electronic ground terminal (GNDe). The second high voltage capacitor (HVC2) is coupled between the signal output terminal (TEO, TEO1) and the electronic ground terminal (GNDe). The main filter element (LX1) is coupled between the signal input terminal (TEI) and the signal output terminal (TEO, TEO1).