| 摘要 |
A power supply device of an emergency light, including: an AC-DC converting module, a charging management circuit, an emergency battery, a power failure detection circuit, and a power failure switching circuit. The input terminal of the AC-DC converting module is connected to a commercial AC power supply via a power switch. The output terminals of the AC-DC converting module are connected respectively to a Light Emitting Diode (LED) lamp and the input terminal of the charging management circuit. The output terminal of the charging management circuit is connected in parallel with the emergency battery. The two input terminals of the power failure detection circuit are connected to the commercial AC power supply via a coupling capacitor. The output terminal of the power failure detection circuit is connected to the input terminal of the power failure switching circuit. The power supply terminal of the power failure switching circuit is connected to the emergency battery, and the output terminal of the power failure switching circuit is connected to the LED lamp. The present invention can be used as an emergency lighting, and also can be used as a normal lighting, without any modification to the current lamp switch and power supply circuitry, enabling a convenient installation and replacement. |
