| 摘要 |
Disclosed in the present utility model is an emergency lighting circuit, characterized in that the emergency lighting circuit comprises a switching power supply circuit, a standby battery, a standby battery charging circuit, a frequency signal amplifier circuit, a control signal amplifier circuit, a relay circuit, a central control circuit, and an LED loading circuit; the relay circuit is in connection with a switching power supply output terminal, the standby battery, an alternating current input terminal, the control signal amplifier circuit, and the central control circuit; the two terminals of the standby battery charging circuit are respectively in connection with the switching power supply output terminal and the standby battery; one terminal of the frequency signal amplifier circuit is in connection with the alternating current input terminal, and the other terminal is in connection with the central control circuit; the frequency signal amplifier circuit comprises a first operational amplifier circuit and a second operational amplifier circuit, and one terminal of the first operational amplifier circuit and one terminal of the second operational amplifier circuit are respectively in connection with a live wire terminal and a zero line terminal of the alternating current. |
