Abstract: To protect electromagnetic ballasts against damage, driver circuits for coupling the electromagnetic ballasts to light circuits comprising light emitting diodes are provided with rectifier bridges for exchanging first current signals with the electromagnetic ballasts and for providing second current signals to the light circuits, and with protection circuits for protecting the electromagnetic ballasts against parameters of the first current signals obtaining values larger than threshold values. The parameters may be direct-current components of the first current signals and may be average values of rectified versions of the first current signals/peak values of the first current signals. The rectifier bridges may comprise first diode elements. The protection circuits may comprise second diode elements serially coupled to the first diode elements.

Abstract: According to one embodiment there is provided a lamp device (1) having a lighting module (3) and two pairs of external connection pins (5aa, 5ab, 5ba, 5bb) for connecting the lamp device to a supply voltage of a lighting fixture. A first terminal of the lighting module is connected to a pin of a first pair of pins by a switch which is closed in response to a voltage difference between both the pins of the first pair of pins and the pins of the second pair of pins exceeding a respective threshold voltage. The lamp is therefore safe to handle even in a condition where one pair of pins is connected and the other is not.

Abstract: To protect electromagnetic ballasts (2) against damage, driver circuits (1) for coupling the electromagnetic ballasts (2) to light circuits (3) comprising light emitting diodes are provided with rectifier bridges (11-14) for exchanging first current signals with the electromagnetic ballasts (2) and for providing second current signals to the light circuits (3), and with protection circuits (21-24, 25-27) for protecting the electromagnetic ballasts (3) against parameters of the first current signals obtaining values larger than threshold values. The parameters may be direct-current components of the first current signals and may be average values of rectified versions of the first current signals/peak values of the first current signals. The rectifier bridges (11-14) may comprise first diode elements. The protection circuits (21-24, 25-27) may comprise second diode elements serially coupled to the first diode elements.

Abstract: According to one embodiment there is provided a lamp device (1) having a lighting module (3) and two pairs of external connection pins (5aa, 5ab, 5ba, 5bb) for connecting the lamp device to a supply voltage of a lighting fixture. A first terminal of the lighting module is connected to a pin of a first pair of pins by a switch which is closed in response to a voltage difference between both the pins of the first pair of pins and the pins of the second pair of pins exceeding a respective threshold voltage. The lamp is therefore safe to handle even in a condition where one pair of pins is connected and the other is not.

Abstract: The present invention provides a LED driving circuit, which is adapted to be coupled to a power supply via a phase control dimmer.