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PL 3120/PL 3150/PL 3170 Power Line Smart Transceiver Data Book 143

Detailed schematics and component values for both non-isolated and isolated 3-phase coupling circuits are given in

example coupling circuit numbers 5 and 6, respectively.

Figure 4.22 Transformer Isolated 3-Phase Coupling Circuit

Non-isolated Floating Coupling Circuits

The non-isolated coupling circuits discussed so far are suitable for use with devices incorporating power supplies where

the output common terminal can be connected directly to the mains wiring. A non-isolated power supply with half-wave

rectification is an example of such a supply (Figure 4.23). A non-isolated power supply which incorporates a full-wave

bridge rectifier is not compatible with the non-isolated coupling circuits discussed earlier since the presence of the

coupling circuit will effectively short out part of the rectifier (see Figure 4.24). While this problem can be avoided by

using an isolated coupling circuit, a lower cost option for use with full-wave rectified power supplies is illustrated in

Figure 4.25. This type of coupling circuit is referred to as a Non-isolated Floating Coupling Circuit. The detailed

component values for this coupling circuit are given in coupling circuit example 7 earlier in this chapter.

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Elta LE100 Specifiche Pagina 150