Monitoring device for an array of electrical units

Details Monitoring device for an array of electrical units Monitoring device for an array of electrical units

2006-10-20

2010-02-16

Philogene, Haissa (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S312000, C315S315000, C315S360000, C324S605000, C324S606000, C324S707000, C324S713000

Reexamination Certificate

active

07663323

ABSTRACT:
A monitoring device for monitoring an array (4) of electrical units, in particular an array of high capacity light emitting diodes (LEDs) (4.1-4.12). The electrical units are connected in series and driven by a constant electric current (I). The monitoring device has a bypass means (4.1a-4.12a) for each electrical unit (4.1-4.12), operable to bypass the respective electrical unit in case of a disconnection of the respective electrical unit, and an evaluation unit (3) connected in parallel with the array (4) of electrical units, said evaluation unit (3) being adapted to determine a total voltage (UT) of the array (4) of electrical units and to output a control signal (CS) indicative of a function status of the array (4) of electrical units in accordance with a value of the total voltage (UT) relative to a predetermined threshold value (VREF). Thus is provided an electric circuitry which allows an easy and reliable detection of a malfunction of the array of electrical units, e.g. due to failure of individual LEDs because of short circuits and/or disconnection, while ensuring a continued operation of the array in case of only minor problems. The monitoring device can advantageously be used in signalling devices, in particular for railway signalling purposes.

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