Analog multiplexer with insulation power supply
US7898315B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2008 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | May 13, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/1245
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An analog multiplexer with an insulated power supply includes: an analog signal transformer receiving an analog signal input in its primary winding via an FET, and ON/OFF driving the FET to generate a pulse with an amplitude of the analog signal in its secondary winding; a drive transformer receiving a drive pulse input in its primary winding via an FET to generate a pulse turning ON/OFF the FET in its secondary winding; an inhibit generation circuit generating an inhibit pulse having a wider pulse width than that of the drive pulse; an AND gate determining a logical product of a continuous pulse from a continuous pulse generation circuit and the inhibit pulse to obtain a power supply pulse train; and a rectifying/smoothing circuit obtaining a direct current voltage corresponding to the power supply pulse train to apply the direct current voltage to the primary winding of the transformer through high resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.