Abstract: The present invention relates to a connection circuit (10) for connecting a driver device (26) to an external power supply (16, 21) for driving a load (28), in particular an LED unit (28) comprising one or more LEDs, comprising: a pair of first input terminals (12, 14) for connecting the connection circuit (10) to an external power supply (16, 21) and for receiving an input voltage (V10, V20) from the external power supply (16, 21), at least one second input terminal (18, 20) for connecting the connection circuit (10) to the external power supply (21) and for receiving an input voltage (V20) from the external power supply (21), a rectifier unit (22) connected to the pair of first input terminals (12, 14) and to the at least one second input terminal (18, 20) for rectifying the input voltage (V10, V20) received from the first input terminals (16, 21) and/or the at least one second input terminal (18, 20) and for providing a rectified voltage (V30) to the driver device (26) for driving the load (28), wherein th

Abstract: The present invention relates to an LED retrofit lamp (700) adapted for operation with an alternating current. The LED lamp comprises an LED unit (740), a mains current line, first and second switching devices (710, 720) (e.g., first and second relays), and a control unit (730). The control unit (730) detects an ignition voltage on the mains current line. In response to detecting the ignition voltage on the mains current line, the control unit (730) sets the first and second switching devices (710, 720) to a conducting state such that the LED unit (740) is connected to power. By using the first and second switching devices (710, 720), safety of the LED lamp (700) is improved, in particular when installing the lamp (700) into a fixture designed for fluorescent lamps.

Abstract: The present invention relates to an LED retrofit lamp adapted for operation with an alternating current. The LED lamp comprises an LED unit, first and second switching devices (e.g., first and second relays), a startup voltage supply unit (1010) coupled in parallel to the first switching device, an ignition detection unit (1020) coupled in parallel to the second switching device, and a switch drive unit (1030) for setting the first and second switching devices to a conducting state. If one of the first and second switching devices is shorted either no startup supply voltage or no detection signal is provided, such that the failure is indicated externally to a user.

Abstract: An LED replacement lamp (20) is described. An LED lighting assembly (40) comprising LED lighting elements is electrically connected to filament emulation circuits, connected to electrical contacts at each of two opposite ends (22a, 22b) of an elongated member. The filament emulation circuits (42) each comprise a first resistor circuit (46) and a second resistor circuit (48) connected to first and second electrical contacts (26a, 24a). The first and second resistor circuits (46, 48) are connected to the LED lighting assembly (40) at a common terminal (50). In order to provide an LED replacement lamp for safe operation even in cases of component failure, and if the replacement lamp (20) is used in incorrect wiring configurations, the first and second resistor circuits (46, 48) each comprise a series connection of at least two resistors, in such a way that in case of failure of one of the resistors, the total resistance of the filament emulation circuits (42) remains above a determined resistance value.

Abstract: The present invention relates to a connection circuit (10) for connecting a driver device (26) to an external power supply (16, 21) for driving a load (28), in particular an LED unit (28) comprising one or more LEDs, comprising: a pair of first input terminals (12, 14) for connecting the connection circuit (10) to an external power supply (16, 21) and for receiving an input voltage (V10, V20) from the external power supply (16, 21), at least one second input terminal (18, 20) for connecting the connection circuit (10) to the external power supply (21) and for receiving an input voltage (V20) from the external power supply (21), a rectifier unit (22) connected to the pair of first input terminals (12, 14) and to the at least one second input terminal (18, 20) for rectifying the in put voltage (V10, V20) received from the first input terminals (16, 21) and/or the at least one second input terminal (18, 20) and for providing a rectified voltage (V30) to the driver device (26) for driving the load (28), wherein t

Abstract: The present invention relates to an LED retrofit lamp (1) for being connected to a high frequency electronic ballast (26), the high frequency electronic ballast (26) being adapted for providing a voltage and a current to the LED retrofit lamp (1). The LED retrofit lamp (1) comprises an LED unit (4), an adapting unit (30) for adapting the voltage and the current provided by the high frequency electronic ballast (26) to a voltage and a current for operating the LED unit (4), a detecting unit (40) for detecting an electrical value that depends on the current provided by the high frequency electronic ballast (26), and a ballast protection unit (60) for performing, in dependence of the detected electrical value, an operation for protecting the high frequency electronic ballast (26) from an overcurrent situation. This allows avoiding an unsafe situation, such as when the high frequency electronic ballast (26) is overheated.

Abstract: A lighting driver includes a rectifier having an input connected to receive AC electrical power from an electronic ballast and having an output connected to supply a current to a plurality of light emitting diodes (LEDs) arranged in series with each other in a string, and a switching device disposed at the output of the rectifier and configured to receive a switching control signal and in response thereto to execute a switching operation to modulate an amount of power supplied to the plurality of LEDs so as to cause an average of the power supplied to the plurality of LEDs to be equal to a target power level. A current sensor may be provided to sense the current, and a controller configured to control the switching operation of the switching device in response to the sensed current.

Abstract: Light sources (1) for replacing fluorescent lamps (100) are provided with terminals (11, 12) for exchanging alternating current signals having frequencies of at least kHz with drivers (5), with rectifiers (13) having inputs coupled to the terminals (11, 12) via capacitors (14), and with light emitting diodes (15) coupled to outputs of the rectifiers (13). The rectifiers (13) rectify the alternating current signals and the capacitors (14) provide safety to persons installing the light sources (1). Preferably, the light sources (1) have different ends where the different terminals (11, 12) are located. Each terminal (11, 12) may comprise two pins (21, 22, 23, 24) interconnected via fuses (31,32). Drivers (5) for replacing fluorescent ballasts (500) are provided with inputs (51, 52) to be connected to voltage sources (6)and with outputs (53, 55) for exchanging the alternating current signals with the light sources (1).

Abstract: A LED light source comprises a first rectifier (DB1) having input terminals coupled to an AC voltage source and output terminals connected by a first series arrangement comprising N LED loads and further comprises circuitry (I1, I2, I3, CC) for making the LED loads one by one carry a current when the momentary value of the AC voltage increases and one by one stop carrying a current when the momentary value of the AC voltage decreases. The LED light source also comprises a second rectifier (DB2) having input terminals coupled to the AC voltage source via a reactive element and output terminals connected by a second series arrangement comprising M LED loads and further comprises circuitry (I4) for making the LED loads one by one carry a current when the momentary value of the AC voltage present at the input terminals of the second rectifier increases and one by one stop carrying a current when the momentary value of the AC voltage decreases.

Abstract: The current invention relates to a LED lamp (10) comprising at least one LED light source (103), at least one driver (101) for powering the LED light source (103), at least one input rectifier with a plurality of diodes for converting an AC current from mains into a DC current, providing electrical power to the driver (101), the LED lamp (10) further comprising a safety module comprising one first and one second modules (F1, F2) for protection against overcurrent and overheating of the EM ballast, the first module (F1) being put in series with the driver (101) and designed to interrupt current in case the driver fails when the LED lamp (10) is directly connected to the mains, and the second module (F2) being designed to interrupt current when at least one of the diodes of the input rectifier fails when the lamp is connected to the mains via an EM ballast.

Abstract: Light sources (10) for replacing fluorescent lamps comprise light circuits (3) with light emitting diodes, first and second terminals (1, 2) located at first and second ends of the light sources (10) for exchanging first signals with high-frequency ballasts, and converter circuits (4) for converting the first signals into second signals for feeding the light circuits (3). The converter circuits (4) comprise reactive circuits (5) for matching the light circuits (3) and the high-frequency ballasts and provide safety to persons when installing the light sources (10). The light sources (10) may further comprise protection circuits (7, 8) for protecting parts of the light sources (10) against problems. The protection circuits (7, 8) may comprise monitor circuits (7) for monitoring parameters of the light sources (10) and for in response to monitoring results short-circuiting outputs of the converter circuits (4), and fuses (8). The reactive circuits (5) may comprise protecting capacitors (51, 52).

Abstract: LED light source comprising a string of LED loads (LED1-LED4) supplied by a rectified mains voltage. The number of LED loads carrying current is increased as the momentary amplitude of the rectified mains voltage increases, and is decreased as the momentary amplitude of the rectified mains voltage decreases. The order in which the LED loads start carrying a current and the order in which the LED loads stop carrying a current is reversed for each half period of the mains.

Abstract: An interface circuit is disclosed for operating a light source from an electronic fluorescent driver. In one example, the interface circuit comprises input terminals for connection to lamp connection terminals of the electronic fluorescent lamp driver, a first string interconnecting a first pair of input terminals, a second string interconnecting a second pair of input terminals, a third string interconnecting a first terminal of the first string and a second terminal of the second string and comprising a rectifier, output terminals of said rectifier being coupled during operation to the light source. When a light source is operated making use of the interface circuit, a proper emulation of a fluorescent lamp is obtained.

Abstract: A light generating device (1) is provided with at least a voltage input (21) adapted for receiving a variable voltage, at least three LED circuits (10), coupled with said voltage input (21), wherein each LED circuit (10) comprises a LED unit (14) and controllable current regulator (15) to control the current through said LED circuit (10). The light generating device (1) further comprises a controllable switch matrix (30) comprising a plurality of switches (25, 26, 27), said switch matrix (30) is configured to operate in at least three different switching modes and a controller (50), connected at least with said switch matrix (30), configured to determine said variable operating voltage and to control the switching mode of said switch matrix (30) in dependence of the determined operating voltage.

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: A driver (100) supplies power to drive at least one light source (130). The driver includes: a current regulator (140) connected in series with the at least one light source; and a conditioning circuit (120) configured to receive an AC supply voltage (110) having a primary frequency of between about 50 Hz to 60 Hz, and further configured to condition the received AC supply voltage to supply power to the at least one light source, wherein the conditioned voltage has a non-zero DC component and an AC component, and wherein a magnitude of the AC component at a frequency that is four times the primary frequency is greater than a magnitude of the AC component at the primary frequency, and is also greater than a magnitude of the AC component at a second harmonic of the primary frequency.

Abstract: A string of LED loads is supplied by means of a rectified mains voltage. A cathode of each LED load is coupled to ground by means of a string. The strings are made conductive and non-conductive one by one in dependency of the instantaneous value of the rectified mains using both voltage and current sensing.

Abstract: The invention relates to LED replacement lamp suitable for operation with a high frequency fluorescent lamp ballast, comprising—a LED load (LS) comprising a series arrangement of LEDs,—a first lamp end circuit comprising—a first lamp pin (LP1) and a second lamp pin (LP2) for connection to a first lamp connection terminal comprised in the high frequency fluorescent lamp ballast,—a first rectifier (D1-D4; D1,D2) equipped with at least one input terminal coupled to the second lamp pin and with first and second output terminals coupled to respective ends of the LED load, the first rectifier comprising at least two diodes, one of which is shunted by a first capacitor (C1),—a second lamp end circuit comprising—a third lamp pin (LP3) and a fourth lamp pin (LP4) for connection to a second lamp connection terminal comprised in the high frequency fluorescent lamp ballast,—a second rectifier (D5-D8, D5, D6) equipped with at least one input terminal coupled to the fourth lamp pin and with first and second output terminal

Abstract: Light sources (1) for replacing fluorescent lamps (100) are provided with terminals (11, 12) for exchanging alternating current signals having frequencies of at least kHz with drivers (5), with rectifiers (13) having inputs coupled to the terminals (11, 12) via capacitors (14), and with light emitting diodes (15) coupled to outputs of the rectifiers (13). The rectifiers (13) rectify the alternating current signals and the capacitors (14) provide safety to persons installing the light sources (1). Preferably, the light sources (1) have different ends where the different terminals (11, 12) are located. Each terminal (11, 12) may comprise two pins (21, 22, 23, 24) interconnected via fuses (31,32). Drivers (5) for replacing fluorescent ballasts (500) are provided with inputs (51, 52) to be connected to voltage sources (6)and with outputs (53, 55) for exchanging the alternating current signals with the light sources (1).

Abstract: A series arrangement of LED loads (LP1-LP4) is coupled between output terminals of a rectifier having its input terminals coupled to a mains supply supplying a low frequency AC voltage. Control means render the LED loads conductive one by one, when the amplitude of the supply voltage increases, and non-conductive one by one when the amplitude of the supply voltage decreases. The first LED load (LP1, LP2) has a forward voltage that is substantially higher than that of the other LED loads. As a consequence, the LED utilization is comparatively high, thus allowing the LED loads used in the series arrangement to be comparatively cheap.