LED tube lamp

1. A detuning arrangement for an LED tube lamp, which detuning arrangement comprises:

a detuning circuit comprising:

input connections arranged to receive a lamp current (I LAMP );

output connections arranged to connect the detuning circuit to a driver of the LED tube lamp;

a series inductor between one of the input connections and one of the output connections;

a parallel capacitor between the input connections; and

a configuring circuit in series with the parallel capacitor comprising a current detection circuit realized

to detect the lamp current (I LAMP ) exceeding a predefined threshold (I max ) and to switch out the parallel capacitor when the lamp current exceeds the predefined threshold (I max ).

2. A detuning arrangement according to claim 1 , wherein the configuring circuit realized to:

determine the high-frequency switched ballast is the IC-controlled type by detecting that a lamp current reaches a value of close to 100% of a fluorescent tube lamp current; and

determine the high-frequency switched ballast is the self-oscillating type by detecting that a lamp current reaches the predefined threshold (I max ) of 150% of the fluorescent tube lamp current.

3. A detuning arrangement according to claim 1 , wherein the configuring circuit comprises a switch realized to switch out at least one element of the detuning circuit when the lamp current (I LAMP ) exceeds the predefined threshold (I max ).

4. A detuning arrangement according to claim 2 , wherein the current detection circuit, comprises a power resistor, and the switch comprises a thermal fuse thermally coupled to the power resistor.

5. A detuning arrangement according to claim 3 , wherein the switch comprises a resettable thermal fuse.

6. A detuning arrangement according to claim 3 , wherein the switch comprises a PTC resistor.

7. A detuning arrangement according to claim 4 , comprising a visible indication of the fuse status.

8. A detuning arrangement according to claim 1 , wherein the configuring circuit comprises a bidirectional AC switch, and the current detection circuit comprises a current sensing resistor (R sense ) for sensing the lamp current (I LAMP ), and wherein the current detection circuit is realized to open the bidirectional AC switch when the sensed lamp current (I LAMP ) exceeds a lamp current threshold (I max ).

9. A detuning arrangement according to claim 1 , wherein the configuring circuit comprises a relay, and the current detection circuit is realized to open the relay when the sensed lamp current (I LAMP ) exceeds a lamp current threshold (I max ).

10. An LED tube lamp realized for use with a high-frequency switched ballast, which LED tube lamp comprises

an LED arrangement;

a driver realized to drive the LED arrangement;

a detuning arrangement according to claim 1 .

11. An LED tube lamp according to claim 10 , wherein the detuning circuit is arranged at the input to the driver.

12. An LED tube lamp according to claim 10 , realized as a retrofit lamp to replace a linear fluorescent lamp with a tube diameter in the range of 5.0 mm to 50.0 mm or a compact fluorescent lamp, and comprising an essentially tubular housing to accommodate at least the LED arrangement, the driver and the detuning arrangement.

13. A method of operating a detuning arrangement for an LED tube lamp, the method comprising:

detecting a lamp current (I LAMP ) exceeding a predefined threshold (I max );

switching out a parallel capacitor when the lamp current exceeds the predefined threshold (I max ).