Granted Patent B2

US 9,279,832 · App. 13/632,601 · Granted Mar 8, 2016

Abstract

Claims (11)

1. An apparatus for monitoring voltage, comprising:

an AC voltage monitoring circuit, coupled to at least one AC line, for continuously producing a digital representation of a voltage on the at least one AC line, wherein the digital representation is a representation of instantaneous voltage on the at least one AC line; processing the digital representation to create a data stream containing information regarding the digital representation; and coupling the data stream through an isolation device to form an output signal.

2. The apparatus of claim 1 , wherein the AC voltage monitoring circuit comprises a scaling circuit comprised of resistors to scale the voltage for measurement.

3. The apparatus of claim 1 , wherein the AC voltage monitoring circuit is powered by a capacitive divider coupled to the at least one AC line.

4. The apparatus of claim 1 , wherein the AC voltage monitoring circuit comprises a universal asynchronous receiver-transmitter (UART) for generating the data stream and coupling the data stream to the isolation device.

5. The apparatus of claim 1 , wherein the digital representation is produced by sequential digitization of input signals.

6. The apparatus of claim 1 , wherein the isolation device is a solid state electrical isolation device.

7. The apparatus of claim 6 , wherein the solid state electrical isolation device is an optocoupler.

8. The apparatus of claim 1 , wherein the at least one AC line transmits a single-phase AC voltage.

9. The apparatus of claim 1 , wherein the AC voltage monitoring circuit is coupled to an inverter and transmits the output signal to the inverter.

10. The apparatus of claim 1 , wherein the AC voltage monitoring circuit is coupled to an uninterruptable power supply (UPS) and transmits the output signal to the UPS.

Assignments (8)