# US 2022/0276282 A1 · Methods and apparatus for resistive voltage sensing in an isolated power distribution unit

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- Number: US 2022/0276282 A1
- Document ID: US20220276282A1
- Status: Published application
- Kind: A1
- Application number: 17/643,588
- Filed: 2021-12-09
- Published: 2022-09-01
- Earliest claimed: 2010-10-07
- Assignees: Raritan Americas, Inc.
- Applicants: Raritan Americas, Inc.
- Inventors: Michael SUCHOFF
- Web page: https://patentgrep.com/patent/US20220276282A1

## CPC

- G01R 15/04: Voltage dividers
- G01R 19/0084: {Measuring voltage only}
- G01R 19/16547: {voltage or current in AC supplies (switching for protection H02H; circuits for emergency power supply H02J9/00)}
- G01R 31/42: AC power supplies
- H02J 3/00: Circuit arrangements for AC mains or AC distribution networks
- H02H 9/04: responsive to excess voltage (lightning arrestors H01C7/12, H01C8/04, H01G9/18, H01T)
- H02H 9/06: using spark-gap arresters
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H)

## Abstract

Methods and apparatus provide for a primary side circuit including one or more voltage nodes; and a monitoring circuit operating to monitor one or more parameters of the primary side circuit, and including at least one sensing circuit and at least one processing circuit within a secondary side circuit, where the sensing circuit includes a resistor network having an input for receiving a first sensed voltage from a first of the voltage nodes of the primary side circuit, traversing an isolation boundary between the primary side circuit and the secondary side circuit while adhering to a safety specification, which includes a primary-secondary isolation requirement, and having an output for providing a first modified sensed voltage to the processing circuit.

## Claims

### Claim at position 1

1-7. (canceled)

### Claim 8

An apparatus, comprising:
a primary side circuit including one or more voltage nodes;
a secondary side circuit including at least one processing circuit; and
a resistor network having an input for receiving a first sensed voltage from a first of the one or more voltage nodes of the primary side circuit, traversing an isolation boundary between the primary side circuit and the secondary side circuit while adhering to a safety specification which includes a primary-secondary isolation requirement, and having an output for providing a first modified sensed voltage to the processing circuit;
wherein said resistor network does not span any isolation circuit and further includes:
a plurality of series-coupled resistors, which are connected at one end to the first voltage node of the primary side circuit, and are connected at an opposite end to a junction node;
a shunt resistance coupled from the junction node to a reference potential; and
the output providing the first modified sensed voltage to the processing circuit is at least one of taken from, and derived from, a voltage at the junction node;
wherein the first and second voltage nodes of the primary side circuit produce a differential voltage; and
wherein the plurality of series-coupled resistors includes first and second pluralities of series-coupled resistors, the first plurality of series-coupled resistors being connected at one end to the first voltage node of the primary side circuit and being connected at an opposite end to a first junction node, and the second plurality of series-coupled resistors are connected at one end to the second voltage node of the primary side circuit, and are connected at an opposite end to a second junction node.

### Claim 9 (depends on 8)

The apparatus of claim 8, wherein:
the first voltage node of the primary side circuit exhibits a single ended voltage potential with respect to the reference potential; and
the output providing the first modified sensed voltage to the processing circuit is a single ended voltage taken from the junction node with respect to the reference potential.

### Claim 10 (depends on 8)

The apparatus of claim 8, wherein:
the first voltage node of the primary side circuit exhibits a single ended alternating current (AC) voltage potential with respect to the reference potential;
the apparatus further includes a switching circuit including an input terminal coupled to the junction node and an output terminal, which pulses in response to the AC potential at the input terminal; and
the output providing the first modified sensed voltage to the processing circuit is a single ended pulsed voltage taken from the output terminal of the switching circuit with respect to the reference potential.