Signal and power transformer coupling arrangements
US6911746B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2003 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Jul 24, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C17/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.