This invention is a multi-port power converter where all ports are coupled through different windings of a high frequency transformer. Two or more, and typically all, ports have synchronized switching elements to allow the use of a high frequency transformer. This concept and type of converter is known. This invention mitigates a number of limitations in the present art and adds new capabilities that will allow applications to be served that would otherwise not have been practical. A novel circuit topology for a four-quadrant ac port is disclosed. A novel circuit topology for a unidirectional DC port with voltage boost capabilities is disclosed. A novel circuit topology for a unidirectional DC port with voltage buck capabilities is disclosed. A novel circuit for a high efficiency, high frequency, bi-directional, ac semiconductor switch is also disclosed.
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0. 3. A power conversion system comprising:
a transformer comprising a first winding, a second winding, and a third winding;
a first switching circuit coupled to the first winding and to first terminals for connection to a DC power source;
a buck regulator coupled to the first winding and having a diode, inductor and a switch;
a second switching circuit coupled to the second winding and to second terminals for connection to an electrical power storage device; and
a third switching circuit coupled to the third winding and to third terminals for connection to an ac power source or load,
a boost circuit coupled to the third winding and having an inductor and a switch; and
a control circuit for controlling the first, second and third switching circuits such that at least some of the time, the first, second, and third switching circuits are all active, with switching of the first, second and third switching circuits being synchronized with respect to each other.
0. 17. A power conversion system comprising:
a transformer comprising a first winding, a second winding, and a third winding;
a first switching circuit coupled to the first winding and to first terminals for connection to a DC power source;
a second switching circuit coupled to the second winding and to second terminals for connection to an electrical power storage device; and
a third switching circuit coupled to the third winding and to third terminals for connection to an ac power source or load;
a boost circuit having an inductor and a switch; and
a control circuit for controlling the first, second and third switching circuits such that at least some of the time, the first, second, and third switching circuits are all active, with switching of the first, second and third switching circuits being synchronized with respect to each other, wherein the first switching circuit comprises:
a first semiconductor switch coupled to one of the first terminals and to one end of the first winding;
a second semiconductor switch coupled to the one of the first terminals and to another end of the first winding; and
a third semiconductor switch coupled to another one of the first terminals, and coupled through an inductor to a center tap of the first winding.
1. A power converter apparatus comprising three or more ports, a transformer and a control circuit where one end of each port is connected to a distinct winding on a common transformer core and where the remaining end of each port is connected to a load or power source and where each port comprises an arrangement of capacitive or inductive energy storage elements and semiconductor switches where individual semiconductor switches are commanded on and off by said control circuit in a synchronous manner with semiconductor switches in other ports and where said power converter apparatus is further defined, as having one port dedicated to a storage battery, designated for reference herein as the battery port, having characteristics different from all other ports, specifically, semiconductor switches in the battery port operate in a free-running mode and provide frequency and phase references that are followed by synchronous switches in all remaining ports and the interface at the battery port transformer winding is that of a low impedance ac voltage source or sink, whereas the interface at the transformer windings of all other ports is that of a high impedance ac current source or sink and where these two distinct port types, battery and non-battery, enable energy transfer into or out of all non-battery ports simultaneously and in an autonomous manner in terms of energy transfer and where the net energy into or out of all non-battery ports charges or discharges the storage battery, respectively, via the battery port.
0. 2. The power conversion system of
first and second series MOSFET devices connected in parallel with first and second series IGBT devices between the first and second switch poles;
a gate driver for driving the first and second series MOSFET devices through a first node between the first and second series MOSFET devices, and through a second node between the first and second series IGBT devices.
0. 4. The power conversion system of
0. 5. The power conversion system of
0. 6. The power conversion system of
a first semiconductor switch coupled to one of the first terminals and to one end of the first winding;
a second semiconductor switch coupled to the one of the first terminals and to another end of the first winding; and
a third semiconductor switch coupled to the one of the first terminals, and coupled through a diode to a center tap of the first winding.
0. 7. The power conversion system of
0. 8. The power conversion system of
0. 9. The power conversion system of
0. 10. The power conversion system of
0. 11. The power conversion system of
0. 12. The power conversion system of
a first semiconductor switch coupled to one of the third terminals and to one end of the third winding;
a second semiconductor switch coupled to the one of the third terminals and to another end of the third winding; and
a third semiconductor switch coupled on one side thereof to another one of the third terminals and to a center tap of the third winding, and coupled on another side thereof to the one of the third terminals through an inductor.
0. 13. The power conversion system of
0. 14. The power conversion system of
0. 15. The power conversion system of
0. 16. The power conversion system of
0. 18. The power conversion system of
0. 19. The power conversion system of
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The field of this invention is power electronics and electrical power conversion. Electronic power inverters are devices for converting direct current (DC) power, usually from a storage battery, into alternating current (AC) power for household appliances. Some inverters also convert power from an AC source to charge the storage battery used by the inverter. Devices capable of power transfer in either direction, DC-to-AC or AC-to-DC are commonly referred to as inverter/chargers or bi-directional inverters. Inverters are also used in renewable and distributed energy systems to convert DC power from photovoltaic panels, fuel cells or wind turbines into power that can be delivered into the utility grid. There is a growing demand for an inverter product with this capability that can also charge storage batteries and support AC loads when the utility grid is not available. Residential systems with both renewable energy sources and energy storage components typically use a battery-centric topology. This is because the battery provides a stable voltage and high peak power capabilities. In these systems, the renewable energy source interfaces to the battery through a DC-to-DC converter or charge controller to provide the required matching and regulation functions. The battery is in turn connected to a DC-to-AC inverter, to support the system loads, and to a battery charger. Additional energy sources as well as DC loads would also logically tie in at the storage battery connection point. With the present state of technology, this arrangement typically provides the most cost effective and highest performance system solution. There are a number of inherent limitations with this approach. (i) The storage battery voltages are relatively low compared to the AC voltages that the inverter produces. A common power conversion method is to convert the low DC battery voltage into a low AC voltage and then use a transformer to convert to a higher AC voltage. This approach requires a heavy, expensive, and typically inefficient, low frequency transformer. (ii) The conversion efficiency from the renewable energy source to the battery to the utility grid is low because of the additive losses from each successive power conversion stage. (iii) Higher voltage, higher efficiency, lower cost photovoltaic series “string” arrays are not practical because of the photovoltaic/battery voltage disparity. (iv) Individual power converters in battery-centric systems are usually autonomous. It is advantageous for all power converters to act in concert in order to achieve optimum battery life and to better support the system loads.
The invention is a multi-port power electronics topology, with a high frequency transformer as the common power “conduit” and interface point for all ports. This invention would allow for energy systems that are high-frequency-transformer-core-centric as opposed to battery-centric. This invention mitigates essentially all of the limitations of battery-centric energy systems. The underlying power converter concept used for this invention was originally invented by William McMurry and disclosed in U.S. Pat. No. 3,517,300 in 1970. Since then, others have expanded the potential capabilities of these power converters but with less-than-novel or with technically obvious variations on the original McMurry invention. The invention disclosed herein involves a number of novel power circuit topologies that allow much greater port flexibility and provide enhanced performance. The invention allows a port to perform as a boost or buck converter when sourcing power into the high frequency transformer, a capability that has not been previously established. These added capabilities allow applications to be served that would otherwise not have been practical. Also, the invention allows each non-battery port to “see” only the reflected battery characteristics at the transformer interface so that the operation of all non-battery ports are independent and non-interactive. The preferred embodiment of the invention is intended for residential electrical energy systems. There are three ports; a bi-directional battery port that allows a storage battery to source energy to the transformer or sink energy from the transformer to charge the battery, a bi-directional AC port that allows the transformer to source energy to loads and also to sink or source energy from a utility grid at unity power factor, and a renewable energy port that sources energy into the transformer and is capable of controlling the operating point of the renewable energy source and the amount of power delivered into the transformer. Products developed using this invention will be (i) lighter because transformers operating at ultrasonic frequencies are much smaller than line frequency transformers (ii) lower cost because of the smaller transformer and the system-integrated power conversion approach and (iii) more efficient because of fewer power conversion stages and the lower core and copper losses associated with high frequency transformers. These advantages are had without sacrificing the isolation properties of a transformer.
Patent | Priority | Assignee | Title |
10050446, | Jul 11 2011 | ENPHASE ENERGY, INC | Device and method for global maximum power point tracking |
10263460, | Oct 18 2010 | OPTIMUS ACQUISITION LLC | Uninterruptible power supply systems and methods for communication systems |
10404190, | Mar 15 2013 | ENPHASE ENERGY, INC | Inverter communications using output signal |
10483795, | Oct 11 2010 | ENPHASE ENERGY, INC | System and method for establishing communication with an array of inverters |
8174856, | Apr 27 2011 | ENPHASE ENERGY, INC | Configurable power supply assembly |
8193788, | Apr 27 2011 | ENPHASE ENERGY, INC | Method and device for controlling a configurable power supply to provide AC and/or DC power output |
8279649, | Oct 11 2010 | ENPHASE ENERGY, INC | Apparatus and method for controlling a power inverter |
8284574, | Oct 17 2011 | ENPHASE ENERGY, INC | Method and apparatus for controlling an inverter using pulse mode control |
8325499, | Oct 11 2007 | ENPHASE ENERGY, INC | Methods for minimizing double-frequency ripple power in single-phase power conditioners |
8350411, | Dec 22 2006 | ENPHASE ENERGY, INC | Modular system for unattended energy generation and storage |
8456876, | Apr 27 2011 | ENPHASE ENERGY, INC | Configurable power supply assembly |
8461813, | Jul 11 2011 | ENPHASE ENERGY, INC | Method and device for controlling a configurable power supply to provide AC and/or DC power output |
8462518, | Oct 12 2009 | ENPHASE ENERGY, INC | Power inverter docking system for photovoltaic modules |
8503200, | Oct 11 2010 | Sunpower Corporation | Quadrature-corrected feedforward control apparatus and method for DC-AC power conversion |
8599587, | Apr 27 2011 | ENPHASE ENERGY, INC | Modular photovoltaic power supply assembly |
8611107, | Apr 27 2011 | ENPHASE ENERGY, INC | Method and system for controlling a multi-stage power inverter |
8716907, | Jun 13 2011 | Renewable energy enhanced apparatus | |
8737100, | Oct 17 2011 | ENPHASE ENERGY, INC | Method and apparatus for controlling an inverter using pulse mode control |
8817510, | Oct 11 2010 | ENPHASE ENERGY, INC | Apparatus and method for controlling a power inverter |
8824178, | Dec 31 2009 | ENPHASE ENERGY, INC | Parallel power converter topology |
8842454, | Nov 29 2010 | ENPHASE ENERGY, INC | Inverter array with localized inverter control |
8922185, | Jul 11 2011 | ENPHASE ENERGY, INC | Device and method for global maximum power point tracking |
8929094, | Oct 12 2009 | ENPHASE ENERGY, INC | Power inverter docking system for photovoltaic modules |
9065354, | Apr 27 2011 | ENPHASE ENERGY, INC | Multi-stage power inverter for power bus communication |
9093919, | Jul 31 2009 | ENPHASE ENERGY, INC | Apparatus for converting direct current to alternating current using a frequency converter |
9153961, | Dec 05 2011 | AIRBUS OPERATIONS SAS | Interface device between an electrical network and consumer systems |
9160408, | Oct 11 2010 | ENPHASE ENERGY, INC | System and method for establishing communication with an array of inverters |
9225256, | Jul 31 2009 | ENPHASE ENERGY, INC | Apparatus and method for controlling DC-AC power conversion |
9263183, | Apr 27 2011 | ENPHASE ENERGY, INC | Modular photovoltaic power supply assembly |
9276635, | Jun 29 2012 | ENPHASE ENERGY, INC | Device, system, and method for communicating with a power inverter using power line communications |
9467063, | Nov 29 2010 | ENPHASE ENERGY, INC | Technologies for interleaved control of an inverter array |
9520764, | Feb 15 2013 | CE+T GROUP SA | Bi-directional multi-port applications |
9564835, | Mar 15 2013 | ENPHASE ENERGY, INC | Inverter communications using output signal |
9584044, | Mar 15 2013 | ENPHASE ENERGY, INC | Technologies for converter topologies |
9647568, | Feb 15 2013 | CE+T GROUP SA | Bi-directional multi-port applications |
9774198, | Nov 08 2010 | CULVER INDUSTRIES, LLC | Wind and solar powered heat trace with homeostatic control |
Patent | Priority | Assignee | Title |
4947311, | Nov 16 1989 | BAE SYSTEMS CONTROLS INC | Electrical power conversion circuit |
5017800, | Sep 29 1989 | WISCONSIN ALUMNI RESEARCH FOUNDATION A CORP OF WI | AC to DC to AC power conversion apparatus with few active switches and input and output control |
5029064, | Sep 29 1989 | BALL, NEWTON E | Phase-controlled reversible power conversion with equal duty cycle substantially constant amplitude square wave excitation of the power transformer |
5856712, | Dec 05 1996 | I-Hits Laboratory; Chiyoda Corporation | Uninterruptible power supply method |
6175510, | Apr 06 1999 | Direct conversion uninterruptible power supply | |
6246592, | Aug 10 1999 | Texas Instruments | Unique power supply architecture with cascaded converters for large input-to-output step-down ratio |
6297972, | May 10 2000 | Lucent Technologies, INC | Backup power stage associated with a dual input power supply and method of operating the same |
6429546, | Nov 20 1998 | Georgia Tech Research Corporation | Systems and methods for preventing islanding of grid-connected electrical power systems |
6650552, | May 25 2001 | TDK Corporation | Switching power supply unit with series connected converter circuits |
7449798, | Aug 01 2002 | I-Hits Laboratory | Co-generated power supply system |
20010010637, | |||
20030012038, | |||
20040004402, | |||
20040070944, | |||
20040165408, | |||
20050078491, | |||
20050226017, |
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