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| Top > Solution > Ycap-Lightning |
| Fig.1 Surge path of AC common mode filter + Y capacitor primary negative to secondary negative connection. |
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| Fig.2 Surge path consisting of a π-type choke coil filter and a Y capacitor connected between the primary negative and secondary negative terminals. |
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| In the cases of Fig. 1 and Fig. 2, the surge passes close to the MOSFET Source, which can cause a reverse bias between the Drain and Source of the MOSFET, increasing the risk of damage to the MOSFET. |
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| Fig.3 Surge path of AC common mode filter + Y capacitor connected between primary positive and secondary negative. |
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| Fig.4 Surge path of π-type choke coil filter + Y capacitor connected between primary positive and secondary negative. |
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| In the cases shown in Fig. 3 and Fig. 4, the lightning surge passes through
the drain side of the MOSFET, reducing the possibility of damaging the MOSFET. |
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| The π-type choke coil filter configuration does not have any coil components
to prevent surges, and is more likely to allow larger surges to pass through than AC common mode filters, so care must be taken when connecting the Y-capacitor. |
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