WO2011056902A1 - Chargeur à autoélévation - Google Patents

Chargeur à autoélévation Download PDF

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Publication number
WO2011056902A1
WO2011056902A1 PCT/US2010/055338 US2010055338W WO2011056902A1 WO 2011056902 A1 WO2011056902 A1 WO 2011056902A1 US 2010055338 W US2010055338 W US 2010055338W WO 2011056902 A1 WO2011056902 A1 WO 2011056902A1
Authority
WO
WIPO (PCT)
Prior art keywords
storage device
charger
energy storage
energy harvesting
energy
Prior art date
Application number
PCT/US2010/055338
Other languages
English (en)
Inventor
Ross Teggatz
Brett Smith
Amer Atrash
Wayne Chen
Original Assignee
Triune Ip Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Triune Ip Llc filed Critical Triune Ip Llc
Priority to EP10829048A priority Critical patent/EP2497180A1/fr
Priority to JP2012537975A priority patent/JP2013510551A/ja
Publication of WO2011056902A1 publication Critical patent/WO2011056902A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/10—Control circuit supply, e.g. means for supplying power to the control circuit

Definitions

  • the invention relates to electronic systems for energy harvesting and for the more efficient utilization of energy resources. More particularly, the invention relates to power control methods, systems, and circuitry designed to facilitate the harvesting of useable power from variable power energy sources and to battery charging with low, very low, or variable voltage or current inputs such as photovoltaic energy harvesting systems.
  • an energy storage device charging system in an example of a preferred embodiment, includes an energy storage device connected to a charger.
  • the charger includes a charge controller to supply current to the energy storage device and a bootstrap circuit configured to provide power sufficient to operate the charger at low power levels.
  • an energy storage device charging system has an energy storage device operably connected to a charger having a charge controller.
  • a bootstrap circuit is configured to provide power sufficient to cause the charge controller to supply current to the energy storage device.
  • Energy harvesting devices are operably coupled to the charger. The energy harvesting devices are connected in relation to one another in a configuration switchable between a parallel arrangement and a series arrangement.
  • preferred embodiments include photovoltaic cells coupled to provide energy in the energy storage device charging system further described.
  • an energy harvesting method includes the steps of providing an energy storage device operably connected to a charger having a charge controller and providing a bootstrap circuit operably connected to the charge controller.
  • power from the bootstrap circuit is used to cause the charge controller to supply current to the energy storage device.
  • the charger regulates the output of energy harvesting devices operably coupled to the charger.
  • Figure 1 is a simplified schematic drawing of an example of a preferred embodiment of an energy harvesting circuit according to the invention.
  • FIG. 2 is a simplified schematic drawing of an example of an alternative preferred embodiment of an energy harvesting circuit according to the invention.
  • Figures 3A through 3C are simplified schematic drawings of an example of a preferred embodiment of a configurable array in an energy harvesting circuit according to the invention.
  • Figure 4 is a simplified schematic drawing of an example of a preferred embodiment of an energy harvesting circuit according to the invention having a bootstrap stack in series with a parallel array.
  • the charger circuit 100 configuration and method illustrated in Figure 1 places energy harvesting apparatus, such as one or more solar cell(s) 10 in series or in parallel with an energy storage device such as a battery 12, or array of batteries.
  • a charger 14 provides a regulated connection between the energy harvesting device(s) 10 and energy storage device(s) 12 as further described.
  • the charger 14 includes a charge controller 17 and is connected with a bootstrap circuit 11 which is configured to ensure appropriate startup power in instances when the output of the energy harvesting apparatus 10 is low and/or when the energy storage device 12 is in a depleted state.
  • the charger 14 is preferably supplied power in the form of the summation of the battery voltage added together with the solar cell voltage. This configuration provides the additive voltage for the operation of the charger circuit 100.
  • charging current can be supplied to the battery 12 from the solar cell 10 using a boost regulator, for example represented by charger 14, even if the battery voltage is greater than the solar cell voltage.
  • a boost regulator for example represented by charger 14
  • additional batteries may be used.
  • the individual solar cell elements in an array may be placed in parallel to the extent required to achieve the desired current level, allowing for an array architecture adaptable for efficient energy harvesting and charging operation.
  • One of the potential challenges to using this architecture having all of the solar cells in parallel, is guaranteeing sufficient voltage for startup. Using the charger to supply the summation of the battery voltage and solar cell voltage provides sufficient headroom for the charger to operate.
  • a charging current can be supplied for any battery voltage from the solar cell using a boost charger, even if the battery voltage is greater than the solar cell voltage. All the solar cell elements can be placed in parallel, allowing for a simpler array architecture and more efficient array operation. In the case where the battery 12 is completely discharged, for example, the parallel solar cell 10 may not produce sufficient voltage to begin charging the battery.
  • a string of solar cells placed in series may be used as a startup stack 20 in a bootstrap circuit 21.
  • the output of the startup stack 20 is preferably sufficient to independently provide the startup current necessary to run the control portion 22 of the charger IC 24.
  • the charger 24 operates at 100% duty cycle.
  • the output FETs 26 of the charger 24 do not switch in this state and require only a DC voltage applied to turn on the appropriate gate(s). Therefore, only a minimal power output from the bootstrap circuit 21 is required.
  • the system 200 can draw power from the solar cell array, e.g., parallel stack 29, preferably substantially maximizing energy harvesting.
  • FIG. 3A-3C An additional alternative embodiment of the charging circuit and method within the scope of the invention is shown in Figures 3A-3C, in which the charger circuit 300 is provided with a reconfigurable solar cell array 33.
  • the reconfigurable solar cell array 33 includes individual solar cells 34 coupled by switches 36, 38, in an arrangement by which the cells 34 may be coupled in series, 36 in Figure 3B, or in parallel, 38 in Figure 3C.
  • the array 33 is configured in a series configuration for operation in the bootstrap mode; E.g., The series-connecting switches 36 are switched “on” and the parallel-connecting switches 38 are switched “off.
  • a series configuration provides voltage from the solar cell array 33 that is the sum of the voltage produced by the individual solar cells 34, preferably providing a sufficient voltage level to begin the charging of the battery 39.
  • the array 33 is then preferably reconfigured to a parallel architecture, by switching the series-connecting switches 36 to "off and switching the parallel- connecting switches 38 to "on”.
  • the resulting parallel configuration provides current from the solar cell array 33 that is the sum of the current produced by the individual solar cells 34, providing a relatively high current level suitable for utilizing the energy produced by the solar cells 34 for storing charge on the battery 39.
  • the circuit 300 preferably substantially optimizes the energy harvested from the solar cells and stored or otherwise supplied to a load. It should be appreciated by those skilled in the arts that in addition to the all-series and all-parallel operation, portions of the reconfigurable solar array 33 may be operated in series while other portions are operated in parallel in order to produce a selected voltage/current output level.
  • an embodiment of a charger circuit 400 and related method includes a bootstrap circuit 41 with a relatively small startup energy harvesting cell or array 42 supplemental to a relatively larger parallel energy harvesting array 44.
  • the startup energy harvesting array 42 is preferably used to power the control circuitry 46 of the charger 48, and subsequent to startup of the charger, the larger parallel energy harvesting array 44 is used to power the higher-power output stage of the charger 48.
  • the circuit shown in Figure 4 illustrates an example of a preferred embodiment in a fixed configuration. It should also be understood that this approach may also be used in combination with the reconfigurable array circuit 33 shown in the implementation described with respect to Figure 3.
  • the methods and apparatus of the invention provide one or more advantages including but not limited to improved energy harvesting systems, and/or startup methods, and/or improved low-power efficiency in energy harvesting systems. While the invention has been described with reference to certain illustrative embodiments, those described herein are not intended to be construed in a limiting sense. For example, variations or combinations of steps or materials in the embodiments shown and described may be used in particular cases without departure from the invention. Modifications and combinations of the illustrative embodiments as well as other advantages and embodiments of the invention will be apparent to persons skilled in the arts upon reference to the drawings, description, and claims.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention se rapporte à des procédés et à des systèmes (100, 200, 300, 400) de collecte d'énergie caractérisés en ce qu'un dispositif de stockage d'énergie (12, 28, 39) est connecté à un chargeur (14, 24, 30, 48) pourvu d'un contrôleur de charge (17, 22, 46). A son tour, un circuit autoélévateur (11, 21, 33, 41) connecté au contrôleur de charge (17, 22, 46) fournit une puissance suffisante pour amener le contrôleur de charge (17, 22, 46) à fournir du courant au dispositif de stockage d'énergie (12, 28, 39). Par conséquent, le chargeur (14, 24, 30, 48) est utilisé pour réguler la sortie d'une pluralité de dispositifs de collecte d'énergie (10, 29, 33, 34, 44) qui sont couplés pour un fonctionnement au chargeur (14, 24, 30, 48) et au dispositif de stockage d'énergie (12, 28, 39).
PCT/US2010/055338 2009-11-04 2010-11-03 Chargeur à autoélévation WO2011056902A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10829048A EP2497180A1 (fr) 2009-11-04 2010-11-03 Chargeur à autoélévation
JP2012537975A JP2013510551A (ja) 2009-11-04 2010-11-03 ブートストラップ式充電器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US25785409P 2009-11-04 2009-11-04
US61/257,854 2009-11-04

Publications (1)

Publication Number Publication Date
WO2011056902A1 true WO2011056902A1 (fr) 2011-05-12

Family

ID=43970318

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2010/055338 WO2011056902A1 (fr) 2009-11-04 2010-11-03 Chargeur à autoélévation

Country Status (4)

Country Link
EP (1) EP2497180A1 (fr)
JP (1) JP2013510551A (fr)
KR (1) KR20120102683A (fr)
WO (1) WO2011056902A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2592717A4 (fr) * 2010-09-15 2017-06-14 Panasonic Intellectual Property Management Co., Ltd. Système d'alimentation en courant continu
US10673489B2 (en) 2014-03-04 2020-06-02 Triune Ip Llc Isolation for communication and power

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105703490B (zh) * 2014-11-28 2019-05-07 中国科学院沈阳自动化研究所 一种微型能量捕获装置及其捕获方法
WO2024038772A1 (fr) * 2022-08-15 2024-02-22 国立大学法人静岡大学 Dispositif d'alimentation électrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6060790A (en) * 1998-02-24 2000-05-09 Lockheed Martin Corporation Solar array switching unit
US20060281435A1 (en) * 2005-06-08 2006-12-14 Firefly Power Technologies, Inc. Powering devices using RF energy harvesting
US20070182362A1 (en) * 2006-01-05 2007-08-09 Tpl, Inc. System for Energy Harvesting and/or Generation, Storage, and Delivery
US20070228835A1 (en) * 2005-07-12 2007-10-04 Diran Varzhabedian Backup power system for electrical appliances
US20090200985A1 (en) * 2005-10-21 2009-08-13 Regan Zane Systems and Methods for Receiving and Managing Power in Wireless Devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6060790A (en) * 1998-02-24 2000-05-09 Lockheed Martin Corporation Solar array switching unit
US20060281435A1 (en) * 2005-06-08 2006-12-14 Firefly Power Technologies, Inc. Powering devices using RF energy harvesting
US20070228835A1 (en) * 2005-07-12 2007-10-04 Diran Varzhabedian Backup power system for electrical appliances
US20090200985A1 (en) * 2005-10-21 2009-08-13 Regan Zane Systems and Methods for Receiving and Managing Power in Wireless Devices
US20070182362A1 (en) * 2006-01-05 2007-08-09 Tpl, Inc. System for Energy Harvesting and/or Generation, Storage, and Delivery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2592717A4 (fr) * 2010-09-15 2017-06-14 Panasonic Intellectual Property Management Co., Ltd. Système d'alimentation en courant continu
US10673489B2 (en) 2014-03-04 2020-06-02 Triune Ip Llc Isolation for communication and power

Also Published As

Publication number Publication date
JP2013510551A (ja) 2013-03-21
EP2497180A1 (fr) 2012-09-12
KR20120102683A (ko) 2012-09-18

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