Lamp device and a method for operating a lamp device
AssigneeKoninklijke Philips N.V.
InventorsHaimin Tao, Shrek Wang
Life of this patent
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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.
Claims20
A lamp device comprising:
- a lighting module including a first and a second terminal;
- a first and a second pair of connection pins for connecting the lamp device to a lighting fixture, wherein a first connection pin of the second pair is connected to the second terminal;
- a switch operable to connect a first pin of the first pair to the first terminal when closed;
- and
- circuitry arranged to close the switch in response to a voltage difference between the pins of the first pair exceeding a first threshold voltage and a voltage difference between the pins of the second pair exceeding a second threshold voltage.
A method of operating a lamp device comprising a lighting module including a first and a second terminal and a first and a second pair of connection pins for connecting the lamp device to a lighting fixture, wherein a first connection pin of the second pair of pins is connected to the second terminal, the method comprising:
- monitoring a first voltage difference between the pins of the first pair and a second voltage difference between the pins of the second pair;
- and
- in response to the first voltage difference exceeding a first threshold voltage at a same time as the second voltage difference exceeding a second threshold voltage, connecting a first pin of the first pair of pins to the first terminal.
A lamp device comprising:
- a lighting module including a first and a second terminal;
- a first and a second pair of connection pins for connecting the lamp device to a lighting fixture, wherein a first connection pin of the second pair is connected to the second terminal;
- a switch operable to connect a first pin of the first pair to the first terminal when closed;
- a control circuit;
- and
- a circuit element arranged to provide a control signal to the control circuit in response to a voltage difference between the pins of the second pair exceeding a second threshold voltage;
- wherein the control circuit is arranged to close the switch in response to a voltage difference between the pins of the first pair exceeding a first threshold voltage at the same time as the control signal is received from the circuit element.
Dependencies are inferred from the claim text.