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CA2296962A1 - Open loop current control ballast for low pressure mercury germicidal uv lamps - Google Patents

Open loop current control ballast for low pressure mercury germicidal uv lamps Download PDF

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Publication number
CA2296962A1
CA2296962A1 CA 2296962 CA2296962A CA2296962A1 CA 2296962 A1 CA2296962 A1 CA 2296962A1 CA 2296962 CA2296962 CA 2296962 CA 2296962 A CA2296962 A CA 2296962A CA 2296962 A1 CA2296962 A1 CA 2296962A1
Authority
CA
Canada
Prior art keywords
lamp
circuit
current
inductor
current control
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA 2296962
Other languages
French (fr)
Other versions
CA2296962C (en
Inventor
Pieter De Vries
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
R Can Environmental Inc
Original Assignee
R Can Environmental Inc
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 R Can Environmental Inc filed Critical R Can Environmental Inc
Publication of CA2296962A1 publication Critical patent/CA2296962A1/en
Application granted granted Critical
Publication of CA2296962C publication Critical patent/CA2296962C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Physical Water Treatments (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)

Abstract

An apparatus for starting and operating UV lamps, comprises an AC line powered circuit and a UV lamp. The circuit has a variable frequency AC source, providing AC current to the UV lamp and a ballasting inductor, connected in series with the UV lamp. The inductor and the lamp form a nonresonant coupling sub-circuit where a flow of current from the AC source through the UV lamp is limited by the ballasting inductor. The circuit does not develop dangerously high output voltages if the UV lamp is disconnected or burnt out, as would be the case with resonant output circuits, unless additional circuit protection was implemented. The impedance of the ballast inductor varies with the current frequency, enabling it to act as a current control element with changes in the output frequency. An open loop control circuit of the present invention maintains the lamp current at a relatively constant level without the complexity imposed by closed loop current control methods.
CA 2296962 1999-01-27 2000-01-26 Open loop current control ballast for low pressure mercury germicidal uv lamps Expired - Fee Related CA2296962C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11758799P 1999-01-27 1999-01-27
US06/117,587 1999-01-27

Publications (2)

Publication Number Publication Date
CA2296962A1 true CA2296962A1 (en) 2000-07-27
CA2296962C CA2296962C (en) 2003-12-09

Family

ID=30442274

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2296962 Expired - Fee Related CA2296962C (en) 1999-01-27 2000-01-26 Open loop current control ballast for low pressure mercury germicidal uv lamps

Country Status (1)

Country Link
CA (1) CA2296962C (en)

Also Published As

Publication number Publication date
CA2296962C (en) 2003-12-09

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EEER Examination request
MKLA Lapsed

Effective date: 20150126