Patent ID: 11917736
Assignee: SIGNIFY HOLDING B.V.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 0:
1. A double ended retrofit Light Emitting Diode, (LED) based lighting device for connection to a power source, said retrofit LED lighting device having two connecting terminals at a first end of said LED lighting device for connecting said LED based lighting device to said power source, and having two, separate, further connecting terminals at a second end for further connecting said LED based lighting device to said power source, comprising:
at least one LED for emitting light;
an alternating current, AC, LED driver arranged for receiving an AC current, from said power source, and for driving said at least one LED based on said received AC current,
a filament circuit arranged in between said two separate, connecting terminals for supporting a filament current circulating back to said power source for indicating a presence of said lighting device to said power source, and
a pin-safety circuit comprising pin-safety switches, wherein each switch is connected to a terminal of said two connecting terminals such that said AC current does not flow through said filament circuit when said pin-safety switches are closed, wherein one of the pin-safety switches comprises a changeover contact, wherein said changeover contact comprises:
a central node arranged to be connected to said power source;
a normally-closed node arranged to be connected to said corresponding filament circuit; and
a normally-open node arranged to be connected to said AC LED driver,
such that said filament circuit is functionally disconnected, when said AC current flows to, or from, said AC LED driver.