Power outage alarm circuit
Source: InternetPublisher:兰博 Keywords: Alarm circuit power supply electrolytic capacitor relay Updated: 2021/11/20
Sometimes, when the power supply fails for some reason, an automatic alarm is required to inform people to eliminate the fault as soon as possible. Figure 13-35 shows a power outage alarm.
When the power supply is normal, the KA relay warms
up, causing the KA normally closed contact to open. At this time, the power supply charges the electrolytic capacitor cz
through the indicator light EL and the diode
VD1 . When the power supply
fails, the relay KA is released, and
the normally closed contact of KA is closed, causing the electrolytic capacitor Cl to discharge
to the audible and visual alarm circuit , the neon bulb emits light, and
the speaker sends out an alarm signal. The alarm time is
5 to 6 minutes.
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