US Pat. No. 9,441,795

LED LAMP WITH BALLAST DETECTION AND METHOD THEREOF

Silicon Hill B.V., Amste...

1. An LED lamp arrangement adapted to replace a fluorescent lamp in a luminaire having a ballast for supplying power to the
lamp, the LED lamp arrangement comprising:
a plurality of LEDs arranged in a plurality of groups, wherein the groups of LEDs are connectable in a plurality of circuit
configurations, including at least a first circuit configuration, and a second circuit configuration having a different circuit
arrangement of the groups of LEDs in which at least a portion of the groups of LEDs are connected into the circuit differently
than in the first circuit configuration;

a first circuit adapted to generate an output indicating whether the ballast is a magnetic ballast or a non-magnetic ballast;
and

second circuit adapted to change a connection of the plurality of groups of LEDs between the first circuit configuration and
the second circuit configuration on the basis of the output of the first circuit,

wherein the first circuit configuration comprises a greater number of the LEDs connected in a series string than the second
circuit configuration, and

wherein the second circuit is adapted to connect the plurality of groups of LEDs into the first circuit configuration when
the output from the first circuit indicates the ballast is a magnetic ballast.

US Pat. No. 9,832,837

LED LIGHTING SYSTEM

Silicon Hill B.V., Amste...

1. An LED lamp arrangement adapted for fitting in a luminaire, the luminaire adapted for a fluorescent lamp and having a ballast,
the LED lamp arrangement comprising:
a plurality of LEDs;
more than two electrodes for releasably connecting to the luminaire and for receiving a current from the ballast;
one or more rectifier circuits for rectifying the current and for supplying a rectified current to the LEDs;
a sensor circuit adapted to measure one or more parameters related to an amount of current drawn from the ballast by the LED
lamp arrangement; and

a protection circuit connected to receive the rectified current and adapted to control an amount of current drawn from the
ballast by the LED lamp arrangement,

wherein the LED lamp arrangement is arranged to operate in a plurality of operation modes including a first operation mode
and a second operation mode,

wherein the LED lamp arrangement has a different load impedance in the first operation mode than in the second operation mode,
and

wherein the protection circuit is arranged to automatically switch the LED lamp arrangement between the first operation mode
and the second operation mode on the basis of the measured one or more parameters,

wherein the protection circuit comprises an impedance and a switch, wherein the impedance comprises an inductive element having
an inductance, and the switch is connected across the impedance, and

wherein, in the first operation mode, the switch is in a closed state, so that the impedance is shorted by the switch.

US Pat. No. 10,136,486

LED LIGHTING SYSTEM

SILICON HILL B.V., Amste...

1. An LED lamp arrangement adapted for fitting in a luminaire, the luminaire adapted for a fluorescent tube and having a ballast, the LED lamp arrangement comprising:a plurality of LEDs;
two or more electrodes for releasably connecting to the luminaire and for receiving a current from a ballast for supply to the plurality of LEDs) in a first operation mode; and
a sensor circuit adapted to measure one or more parameters related to an amount of current received from the ballast in the first operation mode;
wherein the LED lamp arrangement is arranged to operate in a plurality of operation modes, wherein current from the ballast is conducted through the LEDs in each operation mode;
wherein the LED lamp arrangement is adapted to automatically switch from the first operation mode to a second operation mode if the measured one or more parameters exceed a threshold which indicates whether the ballast is a constant current ballast or not a constant current ballast; and
wherein, in the first operation mode, the LED lamp arrangement has a lowest load impedance among the plurality of operation modes.

US Pat. No. 10,060,603

SAFETY END CAP ASSEMBLY FOR A LED TUBE, AND LED TUBE ASSEMBLY COMPRISING A SAFETY END CAP ASSEMBLY

SILICON HILL B.V., Amste...

1. A safety end cap assembly to be arranged on an end of an elongate housing of a LED tube, comprisingan end cap base element, one end of the end cap base element to be arranged on an end of the elongate housing;
at least one connector pin extending along a longitudinal axis of the end cap base element;
an electrical switch electrically connected to the at least one connector pin and switchable between an open state and a closed state via a switch button arranged on the end cap base element; and
an end cap cover element arranged slidable on the end cap base element along said longitudinal axis between a protracted position, in which the switch button is covered by the end cap cover element, and a retracted position, in which the switch button is exposed;whereinin the protracted position the end cap cover element extends beyond the end of the end cap base element opposite the end to be arranged on the end of the elongate housing; andwhereinfor sliding the end cap cover element from the protracted position to the retracted position, the end cap cover element is moved towards the end cap base element.

US Pat. No. 10,342,079

FILTER LED LAMP ARRANGEMENT

Silicon Hill B.V., Amste...

1. An LED lamp suitable for use in a luminaire, the LED lamp adapted for receiving electrical power from the luminaire and comprising:one or more LEDs;
a ballast protection circuit including an impedance;
a filter circuit;
a switched-mode power supply for driving the one or more LEDs;
one or more sensing circuits for generating at least one output, in dependence on whether the electrical power received from the luminaire indicates that the electrical power is provided via a magnetic ballast, an electronic ballast which operates as a constant current ballast, an electronic ballast which operates as a constant power ballast, or not via a ballast; and
a plurality of switches for defining a plurality of operation modes of the LED lamp, and for switching among the plurality of operation modes in dependence on the at least one output from the one or more sensing circuits, wherein the plurality of operation modes comprise:
a first operation mode, in which the switched-mode power supply operates at an operation frequency, the filter circuit is connected for filtering noise generated by the switched-mode power supply, and the ballast protection circuit is disconnected;
a second operation mode, in which the switched-mode power supply does not operate, the filter circuit is disconnected, the ballast protection circuit is connected, and the impedance is bypassed; and
a third operation mode, in which the switched mode power supply does not operate, the filter circuit is disconnected, the ballast protection circuit is connected, and the impedance is connected in series with the LEDs.