| 摘要 |
The invention relates to a series-fed light monitoring system, for example for runway lights at airports. According to the invention, large, expensive and bulky low-frequency transformers are replaced by small high-frequency transformers (T). Signalling and power feeding are separated by capacitive and inductive components (C1, C2, L1). A high-frequency switch (Sw) which is included is used in order to turn a lamp (B) on by chopping the low-frequency power fed in to high-frequency and moreover in order to signal back to the feeding point of the loop (SS).
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