| 摘要 |
An electronic substitution-type double-end straight-tube LED lamp and a safety protection circuit thereof, the safety protection circuit comprising a fluorescent lamp tube analog cathode circuit connected to a first output terminal (1) and a second output terminal (2) of a fluorescent lamp electronic ballast<b/>(100); an output terminal of the fluorescent lamp tube analog cathode circuit is connected to a first anode of a bidirectional silicon controlled rectifier (SCR); a second anode of the bidirectional SCR is connected to an input terminal of a high-frequency rectification filter circuit (300) of the double-end straight-tube LED lamp via a fourth capacitor (C4) and a fifth capacitor (C5); a high-frequency trigger circuit (201), provided between a control electrode of the bidirectional SCR and the output terminal of the fluorescent lamp tube analog cathode circuit, is configured to conducts electricity at a high frequency exceeding 10 kHz. At a low frequency, a distribution capacitor between the control electrode of the bidirectional SCR and the output terminal of the fluorescent lamp tube analog cathode circuit is configured to be open-circuited. A circuit arrangement of a third output terminal (3) and a fourth output terminal (4) of the fluorescent lamp electronic ballast (100) is symmetrical to that of the first output terminal (1) and the second output terminal (2) of the fluorescent lamp electronic ballast (100). |
