摘要:
The present invention relates to an LED lamp (1) adapted for operation with an alternating current. The LED retrofit lamp (1) comprises a LED unit (7, 7', 7'', 7''') and a compensation circuit with a controllable switching device (9, 9'), connected parallel to said LED unit (7, 7', 7'', 7''') to provide an alternate current path. A control unit (10, 10', 10'') is adapted to control said switching device (9, 9') in a compensation mode in which said switching device (9, 9') is set to the conducting state for the duration of a shunt period in each half cycle of the alternating current to allow adapting the power/current of the inventive LED lamp (1), so that a versatile and optimized operation of the lamp (1) is possible.
摘要:
A lighting driver includes a shunt switch circuit configured to detect when an input of the lighting driver is connected to mains power without a ballast, and in response thereto to disable the lighting driver, and further configured to detect a type of ballast connected to the input of the lighting driver when the input of the lighting driver is connected to the ballast, and to regulate a bus voltage of the shunt switch circuit according to the detected type of ballast; and a switching mode power supply configured to receive the bus voltage of the shunt switch circuit and in response thereto to supply a lamp current to drive one or more light emitting diodes.
摘要:
An electric lamp (1) has two pairs of external connection pins (5) adapted for connecting the lamp to a voltage source for powering an internal lighting module (3). Each pair of pins is disconnected from the lighting module by an open switch (6) unless a non-zero electric voltage is applied to the pair and causes the switch to close. The lamp is therefore safe to handle even in a condition where one pair of pins is connected and the other is not. The lamp may be fitted in a switch-start fixture, providing an ohmic connection between two pins in different pairs, as well as a rapid-start fixture, with a capacitive connection.