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US 2003/0201736 A1Published application
Method and arrangement with control gear, and control gear
AssigneeTeknoware Oy
InventorsYrjo Hartikka, Jari Kataja
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AssigneeTeknoware Oy
InventorsYrjo Hartikka, Jari Kataja
Estimating the term…
A method and an arrangement in connection with a control gear arranged to control two parallel-connected fluorescent tubes, and a control gear, whereby the parallel-connected fluorescent tubes are fed using a single control gear in common, which comprises control means arranged to provide output current for the control gear in response to a current reference. The method comprises controlling the control gear to provide output current having a first magnitude, determining continuously the working condition of the fluorescent tubes connected to the control gear, controlling the output current of the control gear to be divided substantially evenly between both fluorescent tubes, when said tubes are in working condition, detecting a change in the working condition of one or both of the tubes to be fed, changing the output current of the control gear to a second magnitude of the output current in response to the change detected in the working condition, and controlling the control gear to provide output current having the second magnitude.
A method in connection with a control gear arranged to control two parallel-connected fluorescent tubes, whereby a single common control gear is employed to feed the parallel-connected fluorescent tubes, the control gear comprising control means arranged to provide output current for the control gear in response to a current reference, the method comprising the steps of
An arrangement in connection with a control gear arranged to control two parallel-connected fluorescent tubes, the control gear comprising control means arranged to provide output current for the control gear in response to a current reference, whereby the control means are arranged to control the control gear to provide output current having a first magnitude, wherein the arrangement further comprises
A control gear for controlling two parallel-connected fluorescent tubes comprising a control part and an inverter part, whereby the control part is arranged to control the inverter part for providing output current for the control gear, and elements for determining the working condition of the cathodes in the fluorescent tubes connected to the control gear, wherein the control gear further comprises
Dependencies are inferred from the claim text.