Control of the display background illumination in a power switch
A technology for background lighting and circuit breakers, which is used in circuits, switchgear status indication, user interface regulations, etc., and can solve problems such as investment and maintenance costs.
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[0023] figure 1 A schematic view of a conventional low-voltage circuit breaker 8 with display devices 6, 6' can be seen in the technical background.
[0024] A current transformer 1 used as a current sensor utilizes its primary coil, for example connected to the grid to be monitored (not shown) and provides in its secondary coil a current proportional to the primary grid by means of an electromagnetic coupling, preferably via an iron core. A current that decreases in amperage. Furthermore, the reduced secondary current is converted in the rectifier unit 2 into a proportional, rectified direct current and in this form is simultaneously supplied to the other circuit parts of the circuit breaker 8 as their power supply and as Measure the signal. The connected storage capacitor 3 receives a charge proportional to its capacitance and the applied voltage and keeps this charge as a supply reserve. Because the current in the network to be monitored is subject to large fluctuations,...
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