# US 10,770,903 B2 · Distributed energy system with four conductor bipolar DC bus

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- Number: US 10,770,903 B2
- Document ID: US10770903B2
- Status: Granted
- Kind: B2
- Application number: 16/029,376
- Filed: 2018-07-06
- Published: 2018-11-01
- Granted: 2020-09-08
- Earliest claimed: 2015-04-30
- Assignees: Zyntony, Inc.
- Applicants: Zyntony, Inc.
- Inventors: Robin Urry; Roger Johnsen; Russell Scott
- Web page: https://patentgrep.com/patent/US10770903B2

## CPC

- H02J 1/102: being switching converters (H02J1/108, H02J1/12 take precedence)
- H02J 3/38: Arrangements for feeding a single network from two or more generators or sources in parallel; Arrangements for feeding already energised networks from additional generators or sources in parallel
- H02J 3/381: {Dispersed generators}
- H02J 2101/24: Photovoltaics
- Y02E 10/56: Power conversion systems, e.g. maximum power point trackers
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

In one embodiment, a direct current bus is disclosed. The direct current bus is a four conductor bus and comprises a positive voltage conductor, a neutral conductor, a negative voltage conductor, and a safety ground. The direct current bus may be implemented in a photovoltaic system to interconnect various components of the photovoltaic system.

## Claims

### Claim 1

A wire comprising:
a positive voltage conductor;
a neutral conductor;
a negative voltage conductor; and
a safety ground,
wherein the positive voltage conductor, the neutral conductor, the negative voltage conductor, and the safety ground are insulated from each other,
wherein the positive voltage conductor, the neutral conductor, the negative voltage conductor, and the safety ground, are connected to a DC-DC converter, and
wherein the positive voltage conductor, the neutral conductor, the negative voltage conductor, and the safety ground are connected to a DC-AC inverter, wherein the safety ground is connected to a metal chassis of the DC-AC inverter.

### Claim 2 (depends on 1)

The wire of claim 1, wherein the positive voltage conductor, the neutral conductor, the negative voltage conductor, and the safety ground are connected to a second DC-DC converter.

### Claim 3 (depends on 1)

The wire of claim 1, wherein the positive voltage conductor, the neutral conductor, the negative voltage conductor, and the safety ground are connected to a plurality of DC-DC converters.

### Claim 4 (depends on 1)

The wire of claim 1, wherein the positive voltage conductor supports a positive polarity voltage of between 175 and 225 volts.

### Claim 5 (depends on 1)

The wire of claim 1, wherein the negative voltage conductor supports a negative polarity voltage of between −175 volts and −225 volts.

### Claim 6 (depends on 1)

The wire of claim 1, wherein the electric potential of the wire is 350-400 volts.

### Claim 7 (depends on 1)

The wire of claim 1, wherein the neutral conductor acts as a current return for the positive voltage conductor and the negative voltage conductor.

### Claim 8 (depends on 1)

The wire of claim 1, wherein the wherein the neutral conductor is connected to an AC side of the DC-AC inverter.

### Claim 9 (depends on 8)

The wire of claim 8 wherein the neutral conductor is connected to the AC side of the DC-AC inverter indirectly through one or more other electrical components.

### Claim 10

A system comprising:
a wire, including:
a positive voltage conductor;
a neutral conductor;
a negative voltage conductor; and
a safety ground,
wherein the positive voltage conductor, the neutral conductor, the negative voltage conductor, and the safety ground are insulated from each other; and
a DC-DC converter connected to the positive voltage conductor, the neutral conductor, the negative voltage conductor, and the safety ground, and
a DC-AC converter connected to the positive voltage conductor, the neutral conductor, the negative voltage conductor, and the safety ground, wherein the safety ground is connected to a metal chassis of the DC-AC converter.

### Claim 11 (depends on 10)

The system of claim 10, further comprising an electrical generator connected to the DC-DC converter.

### Claim 12 (depends on 11)

The system of claim 11, wherein the electrical generator connected to the DC-DC converter is a solar panel.

### Claim 13 (depends on 10)

The system of claim 10, further comprising a plurality of electrical generators connected in series as a short-string of solar panels.

### Claim 14 (depends on 13)

The system of claim 13, wherein the series connection of the short-string of solar panels is connected on a first end and a second end to the DC-DC converter.

### Claim 15 (depends on 14)

The system of claim 14, wherein the DC-DC converter includes maximum power point tracking circuitry for the short-string of solar panels.

### Claim 16 (depends on 10)

The system of claim 10, further comprising a plurality of DC-DC converters which are each connected to one or more series connected electrical generators.

### Claim 17 (depends on 16)

The system of claim 16, wherein the plurality of DC-DC converters is connected in parallel to the wire.

### Claim 18 (depends on 17)

The system of claim 17, wherein the wire is further connected to the DC-AC converters.

### Claim 19

A wire comprising:
a first conductor;
a second conductor;
a third conductor; and
a safety ground;
wherein the first conductor, the second conductor, the third conductor, and the safety ground are insulated from each other,
wherein the first conductor, the second conductor, the third voltage conductor, and the safety ground, are connected to a DC-DC converter, and
wherein the first conductor, the second conductor, the third voltage conductor, and the safety ground are connected to a DC-AC inverter, wherein the safety ground is connected to a metal chassis of the DC-AC inverter.