Safety switching device, universal LED tube with safety switching device and universal LED tube power system

摘要

A safety switching device (1) for safely transmitting a current from a power conversion device (3) to an LED light strip (2), wherein the power conversion device (3) is configured to convert the power of an external power source (Vx) is suitable for the operation of the LED light strip (2), wherein the safety switching device (1) comprises: a switching module (11) having a first terminal (111), a second terminal (112) and a trigger terminal (113); a full-bridge conversion unit (12) comprising a first power connection (121), a second power connection (122), a first output connection (123) and a second output connection (124), wherein the first output connection (123) is connected to the second connection (112 ) of the switching module (11) and the second output terminal (124) to the first terminal (111) of the switching module (11) and the first power connector (121) to the LED light bar (2) is connected; a triggering circuit (13) at least consisting of: a diode (131) having a negative pole and a positive pole, a transformer (132) having at least one first primary terminal (P1), a second primary terminal (P2), a first secondary terminal (S1 ) and a second secondary port (S2), wherein the first primary port (P1) is connected to the second power port (122) and the second primary port (P2) is connected to the external power source (Vx) and the second secondary port (S2) is connected to the positive pole, and a trigger holding unit (133) which is connected to the first secondary terminal (S1), the negative pole and the second terminal (112) and the trigger terminal (113) of the switching module (11), a starting capacitor (14) having a first terminal (141) and a second terminal (142), wherein the first terminal (141) to the first power terminal (121) of the full bridge conversion unit (12) and the second terminal (142) to the second Power terminal (122) of the full bridge conversion unit (12) and the first primary terminal (P1) of the transformer (132) is connected to form a first branch (Br1), and a branch diode (15) having a positive pole and a negative pole wherein the plus pole is connected to the second output terminal (124) of the full bridge conversion unit (12) and the negative pole is connected to the first terminal (111) of the switch module (11) to form a second pointer (Br2), the trigger means Holding unit (133) is configured so that it generates the current required for the switching module (11) to ensure that the external power source (Vx), the LED light bar (2) is powered after the switching module (11) was turned on when the external power source (Vx) is powering the LED light bar (2).