Transformerless power conversion

Patent metadata

Field	Value
Publication number	US-10439399-B2
Application number	US-201815968502-A
Country	US
Kind code	B2
Filing date	May 1, 2018
Priority date	Jul 1, 2015
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A power system including a rectifier and an inverter. The rectifier has a plurality of phase input terminals and a plurality of rectifier output terminals that provide respective rectified outputs, rectifier circuitry that rectifies the signals on the phase input terminals to generate respective rectified outputs on the rectifier output terminals, a rectifier neutral to receive a power source neutral, and capacitors connected between the rectifier neutral and the rectifier output terminals. The inverter includes a respective plurality of inverter input terminals respectively connected to the rectifier output terminals, a plurality of inverter output terminals, and an inverter neutral. The rectifier neutral and the inverter neutral are coupled by a conductor to form a same neutral.

First claim

What is claimed is:

1. A system, comprising:
a rectifier including:
a plurality of phase input terminals, each phase input terminal to receive a phase output from a power source;
a plurality of rectifier output terminals that provide respective rectified outputs;
rectifier circuitry that rectifies the signals on the phase input terminals to generate respective rectified outputs on the rectifier output terminals;
a rectifier neutral to receive a power source neutral;

capacitors connected between the rectifier neutral and the rectifier output terminals;
an inverter including:
a respective plurality of inverter input terminals respectively connected to the rectifier output terminals;
a plurality of inverter output terminals;
an inverter neutral; and
wherein the rectifier neutral and the inverter neutral are coupled by a conductor to form a same neutral; and
inverter circuitry that inverts the rectified outputs to generate respective AC outputs on the inverter output terminals, wherein the respective AC outputs are referenced to a utility neutral by coupling the utility neutral to the same neutral formed by the coupled rectifier neutral and inverter neutral.

2. The system of claim 1 , further comprising:
a first power source having power source neutral, and a first phase output; and
wherein phase input terminals are connected to the first phase output, and the power source neutral is connected to the rectifier neutral.

3. The system of claim 2 , further comprising:
a second power source including a second power source first output and second power source second output;
a converter including:
a converter first input terminal to receive the second power source first output;
a converter second input terminal to receive the second power source second output;
a converter first output terminal and a second converter second output terminal; and
converter circuitry that converts the second power source first output and the second power source second output to generate respective converter first and second outputs on converter first and second output terminals; and

the first capacitor connected between the rectifier neutral and the converter first output terminal; and
the second capacitor connected between the rectifier neutral and the converter second output terminal.

4. The system of claim 3 , wherein the first power source includes a generator.

5. The system of claim 3 , wherein the second power source includes a photovoltaic system.

6. The system of claim 3 , wherein the second power source includes a battery.

7. The system of claim 3 , wherein a first voltage of the second power source first output and the second power source second output is different relative to a second voltage of the converter first and second outputs on the converter first and second output terminals.

8. The system of claim 1 , wherein the neutral output of the power source is connected to earth ground.

Assignees

• Google Llc

Inventors

• Kim Sangsun
• Ramesh Anand
• Aldous Scott
• Zipfel John

Classifications

• H02J2101/24

  Photovoltaics · CPC title

• H02J2101/20

  Dispersed power generation using renewable energy sources · CPC title

• H02J9/063

  Common neutral, e.g. AC input neutral line connected to AC output neutral line and DC middle point · CPC title

• H02M7/48

  using discharge tubes with control electrode or semiconductor devices with control electrode · CPC title

• H02J3/32 Primary

  using batteries or super capacitors with converting means · CPC title