Method and arrangement with control gear, and control gear

Details Method and arrangement with control gear, and control gear Method and arrangement with control gear, and control gear

H - Electricity

05

B

H05B 41/36 (2006.01) H05B 41/282 (2006.01) H05B 41/298 (2006.01)

Patent

CA 2425351

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 con- nected 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.

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