Split phase power conversion apparatuses, methods and systems

Patent metadata

Field	Value
Publication number	US-9768677-B2
Application number	US-201615061502-A
Country	US
Kind code	B2
Filing date	Mar 4, 2016
Priority date	Jan 20, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

Split phase power conversion apparatuses, methods and systems are disclosed. One exemplary embodiment includes a generator, an AC/DC converter coupled with the generator, a DC bus coupled with the AC/DC converter, and an inverter coupled with the DC bus. The inverter includes first, second, and third legs each including a plurality of switches. A first controller provides a control signal to the first leg based upon a voltage between a first system output and a second system output and a first current provided to the first system output. A second controller provides a second control signal to the second leg based upon a voltage between the second system output and a third system output and a second current provided to the third system output. A third controller controls the third leg to provide an output equal to one half of the DC bus voltage.

First claim

What is claimed is:

1. A system comprising:
a generator structured to generate an AC voltage;
an AC/DC converter coupled to the generator and structured to receive the AC voltage from the generator and covert the AC voltage into a DC input voltage;
a DC bus coupled to the AC/DC converter, the DC bus including a first DC rail and a second DC rail structured to receive the DC input voltage from the AC/DC converter;
an inverter coupled to the DC bus and structured to receive the DC input voltage from the DC bus, the inverter including a first leg, a second leg, and a third leg, each of the legs including a first switch and a second switch coupled in series between the first DC rail and the second DC rail and an output node between the first switch and the second switch;
an output circuit including:
a first system output node coupled with the output node of the first leg;
a second system output node coupled with the output node of the second leg; and
a third system output node coupled with the output node of the third leg;

a differential mode controller configured to control the first and second switches of the first leg and the second leg using a first voltage between the first system output node and the second system output node and a current difference between a first current at the first system output node and a second current at the second system output node; and
a common mode controller configured to control the first and second switches of the third leg, wherein the common mode controller is configured to provide a 50% duty cycle of the first and second switches of the third leg regardless of load imbalance on the first leg and the second leg, so that an voltage at the output node of the third leg equals one half of a DC input voltage between the first DC rail and the second DC rail.

2. A system of claim 1 , wherein the output circuit further including:
a first inductor coupled in series between the output node of the first leg and the first system output node;
a second inductor coupled in series between the output node of the second leg and the second system output node;
a third inductor coupled in series between the output node of the third leg and the third system output node;
a first capacitor coupled in series between the first system output node and the third system output node; and
a second capacitor coupled in series between the second system output node and the third system output node.

3. A system of claim 1 , wherein the differential mode controller and the common mode controller are structured to provide a split phase output, the split phase output including:
a first phase output voltage between the first system output node and the third system output node;
a second phase output voltage between the second system output node and the third system output node; and
a combined output voltage between the first system output node and the second system output node.

4. A system of claim 1 , wherein the differential mode controller comprises:
a voltage control loop structured to generate a first output using a first difference between reference data and the first voltage; and
a current control loop structured to generate the first control signal using the first output and the current difference.

5. A system of claim 1 , wherein the differential mode controller and the common mode controller are structured to provide a three phase output, the three phase output including:
a first phase output voltage between the first system output node and the second system output node;
a second phase output voltage between the second system output node and the third system output node; and
a third phase output voltage between the first system output node and the third system output node.

6. A system of claim 1 , wherein the differential mode controller and the common mode controller are structured to selectably provide:
a single phase output voltage between the first system output node and the third system output node, the second system output node and the third system output node, or the first system output node and the second system output node in a first configuration;
a split phase output including a first phase output voltage between the first system output node and the third system output node, a second phase output voltage between the second system output node and the third system output node, and a combined output voltage between the first system output node and the second system output node in a second configuration; or
a three phase output node including a first phase output voltage between the first system output node and the second system output node, a second phase output voltage between the second system output node and the third system output node, and a third phase output voltage between the first system output node and the third system output node in a third configuration.

7. A system comprising:
an inverter including a first leg, a second leg, and a third leg coupled in parallel, each of the legs including a plurality of switching devices;
an output circuit including a first system output node coupled with the first leg, a second system output node coupled with the second leg, and a third system output node coupled with the third leg;
a first controller configured to control the switching devices of the first leg and the second leg using a first voltage between the first system output node and the second system output node and a current difference between a first current at the first system output node and a second current at the second system output node; and
a second controller configured to control the switching devices of the third leg, wherein the second controller is configured to provide a 50% duty cycle of the switching devices of the third leg regardless of load imbalance on the first leg and the second leg, so that an output equals one half of a DC input voltage on the third leg.

8. The system of claim 7 , wherein the output circuit further comprises:
a first inductor coupled in series between the first leg and the first system output node;
a second inductor coupled in series between the second leg and the second system output node;
a third inductor coupled in series between the third leg and the third system output node;
a first capacitor coupled in series between the first system output node and the third system output node; and
a second capacitor coupled in series between the second system output node and the third system output node.

9. A system of claim 8 , wherein the third inductor has a smaller inductance than the first and second inductors.

10. The system of claim 7 , further comprising:
a generator;
an AC/DC converter, wherein the AC/DC converter is coupled to the generator and the DC bus and is structured to receive an AC voltage from the generator, convert the AC voltage into the DC input voltage, and provide the DC input voltage to the DC bus; and
a DC bus, wherein the DC bus receives the DC input voltage and provides the DC input voltage to the inverter.

11. The system of claim 10 , wherein the generator, the AC/DC converter, the DC bus, and the inverter are configured as one of a land vehicle auxiliary power system, a stationary standby power system, or a marine vessel power system.

12. The system of claim 10 , further comprising a storage battery coupled to the DC bus, wherein in a first selectable mode, the first controller and the second controller are configured to provide an AC voltage waveform output between at least two of the first, second, and third system output nodes based at least in part upon a current from the storage battery.

13. The system of claim 12 , whe

Assignees

• Cummins Power Generation Ip

Inventors

• Ayana Elias
• Nath Shabari
• Solorzano Abel
• Walseth Andrew
• Kunin Sergey
• Palmer Brad

Classifications

• H02M5/4585 Primary

  having a rectifier with controlled elements · CPC title

• H02M5/458

  using semiconductor devices only · CPC title

• H02M1/084 Primary

  using a control circuit common to several phases of a multi-phase system · CPC title