Signal and power transformer coupling arrangements

Details Signal and power transformer coupling arrangements Signal and power transformer coupling arrangements

2005-06-28

2005-06-28

Riley, Shawn (Department: 2838)

Electrical transmission or interconnection systems

Wave form or wave shape determinative or pulse-producing...

With rectification or derectification

Reexamination Certificate

active

06911746

ABSTRACT:
An isolating coupling arrangement couples signals in both directions via a transformer between first and second (or more) units each having differential signal transmit buffers and receivers. A diode bridge and capacitor produce an isolated power supply voltage for the second unit from signals coupled from the first unit via the transformer. The diode bridge can use intrinsic diodes of CMOS output circuits of the transmit buffers, which can be controlled synchronously using a phase locked loop responsive to signals coupled from the first unit via the transformer. A supply voltage for the first unit can be increased to compensate for voltage drops of the diode bridge on start-up prior to the synchronous operation. A resistor in parallel with a diode of the bridge provides an asymmetrical load to create a DC component of transformer magnetizing current to eliminate oscillations during signal gaps.

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patent: 04212528 (1992-04-01), None

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