WO2008011310A1 - Air cleaner including constant current power supply - Google Patents
Air cleaner including constant current power supply Download PDFInfo
- Publication number
- WO2008011310A1 WO2008011310A1 PCT/US2007/073208 US2007073208W WO2008011310A1 WO 2008011310 A1 WO2008011310 A1 WO 2008011310A1 US 2007073208 W US2007073208 W US 2007073208W WO 2008011310 A1 WO2008011310 A1 WO 2008011310A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power supply
- constant current
- current power
- voltage threshold
- air cleaner
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/66—Applications of electricity supply techniques
- B03C3/68—Control systems therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S323/00—Electricity: power supply or regulation systems
- Y10S323/903—Precipitators
Definitions
- the present invention relates to an air cleaner, and more particularly, to an air cleaner including a constant current power supply.
- Air cleaners are widely used for removing foreign substances from the air.
- the foreign substances can include pollen, dander, smoke, pollutants, dust, etc.
- an air cleaner can be used to circulate room air.
- An air cleaner can be used in many settings, including at home, in offices, workrooms, etc.
- An air cleaner can include any type of mechanical filter element comprising a mesh, a weave, a foam, etc.
- An air cleaner can further include electrical air cleaning components, such as a collector cell that removes dirt and debris from the airflow of the air cleaner.
- a collector cell can comprise an ionizer and/or an electrostatic precipitator. The collector cell requires a high voltage power supply in order to operate. The high voltage power supply typically supplies a high voltage at a relatively low electrical current.
- the manufacturer typically attempts to match the power supply to the collector cell. This is usually done by tuning the power supply to a specific output voltage, such as by use of a potentiometer (i.e., a variable resistor) that is adjusted to set the output voltage of the power supply.
- the output voltage is therefore essentially fixed, while the output current varies according to the load presented by the collector cell.
- the prior art fixed output voltage produces a desired output current in the collector cell.
- a prior art air cleaner detects changes in the output current in order to detect problems such as arcing or shorting in the cell and shuts down power to the cell when such problems occur.
- the output current can increase greatly upon the occurrence of arcing or shorting in the cell.
- the prior art has drawbacks.
- the output voltage although set at the time of manufacture, can vary due to atmospheric conditions, such as the ambient air temperature and ambient humidity. Ionization of air is heavily influenced by both factors. In addition, the output voltage is also affected by assembly tolerance variations in the cell geometry. Consequently, the electrical current in the cell is difficult to set and control in a consistent fashion. Further, subsequent changes in temperature and humidity during operation can change the operating current requirements. As a result, a prior art air cleaner collector cell can operate at less than optimal voltage and current settings. This can result in poor performance if the voltage and/or current are undesirably low. Alternatively, this can result in excessive arcing and shorting (and therefore physical damage to the air cleaner) if the voltage and/or current are undesirably high. Moreover, this can result in the operation of the cell at improper times and can result in shut down of the cell at improper times.
- An air cleaner including a constant current power supply is provided according to an embodiment of the invention.
- the air cleaner comprises a collector cell and a constant current power supply coupled to the collector cell.
- the constant current power supply is configured to maintain a substantially constant electrical current output to the collector cell, compare an output voltage of the constant current power supply to an upper voltage threshold V n and to a lower voltage threshold V L , and shut down the constant current power supply if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L .
- a method of providing high voltage electrical power to a collector cell of an air cleaner comprises maintaining a substantially constant electrical current output from a constant current power supply of the air cleaner to the collector cell, comparing an output voltage of the constant current power supply to an upper voltage threshold and to a lower voltage threshold V L , and shutting down the constant current power supply if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L .
- a method of providing high voltage electrical power to a collector cell of an air cleaner comprises maintaining a substantially constant electrical current output from a constant current power supply of the air cleaner to the collector cell and comparing an output voltage of the constant current power supply to an upper voltage threshold and to a lower voltage threshold V L .
- the method further comprises shutting down the constant current power supply if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L and generating a failure indication if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L .
- One aspect of the invention includes an air cleaner including a constant current power supply, comprising: a collector cell; and a constant current power supply coupled to the collector cell and configured to maintain a substantially constant electrical current output to the collector cell, compare an output voltage of the constant current power supply to an upper voltage threshold Vu and to a lower voltage threshold V L , and shut down the constant current power supply if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L .
- the constant current power supply is further configured to generate a failure indication if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L .
- the constant current power supply provides short circuit protection.
- the constant current power supply provides arc protection.
- the collector cell comprises one or both of an ionizer and an electrostatic precipitator.
- the upper voltage threshold Vu is substantially equal to an open load voltage of the constant current power supply.
- Another aspect of the invention comprises a method of providing high voltage electrical power to a collector cell of an air cleaner, the method comprising: maintaining a substantially constant electrical current output from a constant current power supply of the air cleaner to the collector cell; comparing an output voltage of the constant current power supply to an upper voltage threshold and to a lower voltage threshold V L ; and shutting down the constant current power supply if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L .
- the method further comprises generating a failure indication if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L .
- the method further comprises the constant current power supply provides short circuit protection.
- the method further comprises the constant current power supply provides arc protection.
- the method further comprises the collector cell comprises one or both of an ionizer and an electrostatic precipitator.
- the method further comprises the upper voltage threshold Vu is substantially equal to an open load voltage of the constant current power supply.
- Another aspect of the invention comprises a method of providing high voltage electrical power to a collector cell of an air cleaner, the method comprising: maintaining a substantially constant electrical current output from a constant current power supply of the air cleaner to the collector cell; comparing an output voltage of the constant current power supply to an upper voltage threshold and to a lower voltage threshold V L ; shutting down the constant current power supply if the output voltage is not between the upper voltage threshold V n and the lower voltage threshold V L ; and generating a failure indication if the output voltage is not between the upper voltage threshold Vu and the lower voltage threshold V L .
- the method further comprises the constant current power supply provides short circuit protection.
- the method further comprises the constant current power supply provides arc protection.
- the method further comprises the collector cell comprises one or both of an ionizer and an electrostatic precipitator.
- the method further comprises the upper voltage threshold V n is substantially equal to an open load voltage of the constant current power supply.
- FIG. 1 shows an air cleaner according to an embodiment of the invention.
- FIG. 2 is a graph showing the output voltage V 0 over time.
- FIG. 3 is a flowchart of a method of providing high voltage electrical power to a collector cell of an air cleaner according to an embodiment of the invention.
- FIG. 1 shows an air cleaner 100 according to an embodiment of the invention.
- the air cleaner 100 can comprise an air cleaning device for home or office use, for example.
- the air cleaner 100 includes a constant current power supply 102 and a collector cell 110.
- the collector cell 110 is connected to and receives electrical power from the constant current power supply 102.
- the collector cell 110 can comprise a combined ionizer and electrostatic precipitator, for example.
- the electrostatic precipitator and the ionizer operate by creating high-voltage electrical fields, typically in excess of 5,000 volts. Dirt and debris in the air becomes ionized when it is brought into this high voltage electrical field by an airflow.
- Charge plates or electrodes in the electrostatic precipitator air cleaner such as positive and negative plates or positive and ground plates, create the electrical field and one of the electrode polarities attracts the ionized dirt and debris.
- the electrostatic precipitator comprises electrodes or plates through which airflow can easily and quickly pass, only a small amount of energy is required to provide airflow through the electrostatic precipitator. As a result, foreign objects in the air can be removed efficiently and effectively.
- the ionizer can comprise charge wires and ground plates, wherein the ionizer charges particles in the airflow before the airflow enters the electrostatic precipitator.
- the charging of the particles can neutralize or kill living organisms.
- the ionized particles of the airflow are subsequently attracted to ground potential surfaces. As a result, the electrically charged dirt and debris is more likely to be pulled out of the airflow when the airflow passes through the electrostatic precipitator.
- the constant current power supply 102 supplies a substantially constant electrical current to the collector cell 110.
- the constant current power supply 102 is designed to provide the substantially constant current to the collector cell 110 within a predetermined range of voltages. In some embodiments, the electrical current supplied to the collector cell 110 is about 150 micro amperes ( ⁇ A), within a predetermined tolerance range.
- the constant current power supply 102 provides an output voltage that can vary.
- the output voltage can fall between an upper voltage threshold V n and a lower voltage threshold V L during normal operation.
- the upper and lower voltage thresholds VU and VL can be substantially centered around a desired operating voltage, such as centered around about 5.5 kilovolts (kV), for example.
- kV 5.5 kilovolts
- other voltage thresholds are contemplated and are within the scope of the description and claims.
- FIG. 2 is a graph showing the output voltage Vo over time.
- the graph depicts variation in the output voltage Vo over time. It can be seen from the graph that at time A, the output voltage is substantially steady and stays within the upper and lower voltage thresholds Vu and V L .
- the output voltage exceeds the upper voltage threshold Vu-
- the upper voltage threshold V n is substantially equal to an open load voltage of the constant current power supply 102. This can be due to a loss of connection in the collector cell 110, poor ionization conditions, etc.
- the collector cell 110 is therefore performing minimal ionization of the airflow, and as a result the electrical power to the collector cell 110 can be shut down and a failure indication can be generated.
- the output voltage V 0 drops to zero as the electrical power is shut down.
- the output voltage is restored and returns to normal.
- the collector cell 110 resumes operating with the output voltage V 0 being between the upper and lower voltage thresholds V n and V L . Ionization is again being performed satisfactorily.
- the output voltage drops below the lower voltage threshold V L .
- the electrical power is shut down, as the constant current power supply may not be able to maintain a constant current below the lower voltage threshold V L .
- the drop in output voltage can be due to problems such as arcing and shorting in the collector cell 110, for example.
- Arcing or shorting can be due to various causes, such as excessive humidity, presence of water or other liquids in the collector cell 110 (such as residual liquids from a washing operation), the presence of excessive (or excessively large) dirt and debris in the collector cell 110, etc. Because arcing or shorting can consume excessive electrical current and because the excessive electrical current can damage the collector cell 110, the electrical power is shut down.
- the constant current power supply 102 can further include a failure indication output.
- the failure indication output can comprise a line, wire, trace, etc., over which a failure indication signal is generated.
- the failure indication signal is generated when the output voltage V 0 is not between the upper and lower voltage thresholds V n and V L .
- the failure indication signal also indicates that the constant current power supply 102 has shut down electrical power to the collector cell 110.
- the failure indication signal can be used to record failures, time failures, etc.
- the failure indication signal can be used to generate a failure indication to a user of the air cleaner.
- the failure indication signal can be employed to illuminate a visual indicator lamp or other indicator device.
- FIG. 3 is a flowchart 300 of a method of providing high voltage electrical power to a collector cell of an air cleaner according to an embodiment of the invention.
- a substantially constant electrical current output is maintained by the constant current power supply 102 to the collector cell 110.
- the constant current power supply 102 can employ any manner of feedback and control in order to maintain the substantially constant electrical current output.
- the output voltage V 0 is compared to an upper voltage threshold V n and to a lower voltage threshold V L .
- the upper and lower voltage thresholds V n and V L can comprise predetermined voltage thresholds.
- the upper and lower voltage thresholds Vu and V L can depend on the parameters of the collector cell 110, including parameters such as physical size, materials used in construction, spacing between plates, etc.
- the upper and lower voltage thresholds V n and V L can be chosen for specific operating conditions, including high and low humidity environments and/or high and low temperature environments, for example.
- step 303 if the output voltage V 0 is between the two thresholds, then the method loops back to step 301 and continues to monitor the output voltage Vo-
- step 304 the method proceeds to step 304.
- the constant current power supply 102 shuts down electrical power to the collector cell 110.
- the electrical power can be removed until a person manually re-starts the air cleaner 100, such as by cycling power to the air cleaner 100 or removing the collector cell 110, for example.
- the constant current power supply 102 can shut down for a predetermined time period and can perform an automatic restart.
- the method can continuously loop in normal operation in order to substantially continuously monitor the output voltage V 0 . Consequently, any unacceptable output voltage level will be quickly detected and disabled.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0900298A GB2452671B (en) | 2006-07-17 | 2007-07-11 | Air cleaner including constant current power supply |
CA2657506A CA2657506C (en) | 2006-07-17 | 2007-07-11 | Air cleaner including constant current power supply |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/487,912 US7357828B2 (en) | 2006-07-17 | 2006-07-17 | Air cleaner including constant current power supply |
US11/487,912 | 2006-07-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008011310A1 true WO2008011310A1 (en) | 2008-01-24 |
Family
ID=38738931
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/073208 WO2008011310A1 (en) | 2006-07-17 | 2007-07-11 | Air cleaner including constant current power supply |
Country Status (4)
Country | Link |
---|---|
US (1) | US7357828B2 (en) |
CA (1) | CA2657506C (en) |
GB (1) | GB2452671B (en) |
WO (1) | WO2008011310A1 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7625424B2 (en) * | 2006-08-08 | 2009-12-01 | Oreck Holdings, Llc | Air cleaner and shut-down method |
US20110030560A1 (en) * | 2009-08-04 | 2011-02-10 | Bohlen John R | Air cleaner with multiple orientations |
US20130047857A1 (en) * | 2011-08-31 | 2013-02-28 | John R. Bohlen | Air cleaner with an electrical current in a corona wire correlating to air speed |
US20130047859A1 (en) * | 2011-08-31 | 2013-02-28 | John R. Bohlen | Electrostatic precipitator cell with removable corona unit |
US20130047858A1 (en) * | 2011-08-31 | 2013-02-28 | John R. Bohlen | Electrostatic precipitator with collection charge plates divided into electrically isolated banks |
US10767878B2 (en) | 2017-11-21 | 2020-09-08 | Emerson Climate Technologies, Inc. | Humidifier control systems and methods |
US11486593B2 (en) | 2018-04-20 | 2022-11-01 | Emerson Climate Technologies, Inc. | Systems and methods with variable mitigation thresholds |
US11371726B2 (en) | 2018-04-20 | 2022-06-28 | Emerson Climate Technologies, Inc. | Particulate-matter-size-based fan control system |
EP3781879A4 (en) | 2018-04-20 | 2022-01-19 | Emerson Climate Technologies, Inc. | Systems and methods with variable mitigation thresholds |
US11421901B2 (en) | 2018-04-20 | 2022-08-23 | Emerson Climate Technologies, Inc. | Coordinated control of standalone and building indoor air quality devices and systems |
WO2019204779A1 (en) | 2018-04-20 | 2019-10-24 | Emerson Climate Technologies, Inc. | Indoor air quality and occupant monitoring systems and methods |
USD1017156S1 (en) | 2022-05-09 | 2024-03-05 | Dupray Ventures Inc. | Cleaner |
Citations (6)
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US3984215A (en) * | 1975-01-08 | 1976-10-05 | Hudson Pulp & Paper Corporation | Electrostatic precipitator and method |
US4282014A (en) * | 1975-01-31 | 1981-08-04 | Siemens Aktiengesellschaft | Detector for detecting voltage breakdowns on the high-voltage side of an electric precipitator |
US4326860A (en) * | 1980-11-28 | 1982-04-27 | Nwl Transformers | Ripple insensitive electric precipitator |
US4433281A (en) * | 1979-12-11 | 1984-02-21 | Siemens Aktiengesellschaft | Method for detecting breakdowns in an electrostatic filter |
US4592763A (en) * | 1983-04-06 | 1986-06-03 | General Electric Company | Method and apparatus for ramped pulsed burst powering of electrostatic precipitators |
US20040251124A1 (en) * | 2003-06-12 | 2004-12-16 | Sharper Image Corporation | Electro-kinetic air transporter and conditioner devices with features that compensate for variations in line voltage |
Family Cites Families (14)
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US2217481A (en) * | 1939-09-20 | 1940-10-08 | Westinghouse Electric & Mfg Co | Precipitator indicating system |
US3469371A (en) * | 1967-05-02 | 1969-09-30 | Buell Eng Co | Apparatus for controlling the removal of particle accumulations from the electrodes of an electric precipitator |
DE3301772A1 (en) * | 1983-01-20 | 1984-07-26 | Walther & Cie AG, 5000 Köln | METHOD AND DEVICE FOR AUTOMATIC VOLTAGE REGULATION OF AN ELECTROSTATIC FILTER |
JPS6125650A (en) * | 1984-07-17 | 1986-02-04 | Sumitomo Heavy Ind Ltd | Method for controlling electrical charge of electrical dust precipitator |
DK552186A (en) * | 1986-11-19 | 1988-05-20 | Smidth & Co As F L | METHOD AND APPARATUS FOR DETECTING RETURN RADIATION IN AN ELECTROFILTER WITH GENERAL OR INTERMITTING POWER SUPPLY |
ES2075201T3 (en) * | 1990-04-04 | 1995-10-01 | Siemens Ag | PROCEDURE FOR THE REGULATION OF THE INSTALLATION OF CURRENT SUPPLY OF AN ELECTROFILTER. |
US5477464A (en) * | 1991-11-26 | 1995-12-19 | Abb Flakt Ab | Method for controlling the current pulse supply to an electrostatic precipitator |
SE500810E (en) * | 1993-01-29 | 2003-01-29 | Flaekt Ab | Ways of regulating power supply to an electrostatic dust separator |
US5578112A (en) * | 1995-06-01 | 1996-11-26 | 999520 Ontario Limited | Modular and low power ionizer |
PL346832A1 (en) * | 1998-09-18 | 2002-02-25 | Fls Miljo As | A method of operating an electrostatic precipitator |
SE518282C2 (en) * | 2000-04-12 | 2002-09-17 | Alstom Switzerland Ltd | Ways to protect the DC generator from overvoltage in case of load failure |
US7122070B1 (en) * | 2002-06-21 | 2006-10-17 | Kronos Advanced Technologies, Inc. | Method of and apparatus for electrostatic fluid acceleration control of a fluid flow |
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US7351274B2 (en) * | 2005-08-17 | 2008-04-01 | American Standard International Inc. | Air filtration system control |
-
2006
- 2006-07-17 US US11/487,912 patent/US7357828B2/en active Active
-
2007
- 2007-07-11 GB GB0900298A patent/GB2452671B/en not_active Expired - Fee Related
- 2007-07-11 WO PCT/US2007/073208 patent/WO2008011310A1/en active Application Filing
- 2007-07-11 CA CA2657506A patent/CA2657506C/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3984215A (en) * | 1975-01-08 | 1976-10-05 | Hudson Pulp & Paper Corporation | Electrostatic precipitator and method |
US4282014A (en) * | 1975-01-31 | 1981-08-04 | Siemens Aktiengesellschaft | Detector for detecting voltage breakdowns on the high-voltage side of an electric precipitator |
US4433281A (en) * | 1979-12-11 | 1984-02-21 | Siemens Aktiengesellschaft | Method for detecting breakdowns in an electrostatic filter |
US4326860A (en) * | 1980-11-28 | 1982-04-27 | Nwl Transformers | Ripple insensitive electric precipitator |
US4592763A (en) * | 1983-04-06 | 1986-06-03 | General Electric Company | Method and apparatus for ramped pulsed burst powering of electrostatic precipitators |
US20040251124A1 (en) * | 2003-06-12 | 2004-12-16 | Sharper Image Corporation | Electro-kinetic air transporter and conditioner devices with features that compensate for variations in line voltage |
Also Published As
Publication number | Publication date |
---|---|
CA2657506C (en) | 2011-05-03 |
GB2452671A (en) | 2009-03-11 |
GB2452671B (en) | 2011-08-03 |
GB0900298D0 (en) | 2009-02-11 |
CA2657506A1 (en) | 2008-01-24 |
US20080011162A1 (en) | 2008-01-17 |
US7357828B2 (en) | 2008-04-15 |
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