Patent ID: 11923720
Assignee: nan
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F | IPC F  H

Claim 19:
20. An emergency light, comprising
a lighting module configured for emitting lights;
an input unit comprising two input terminals configured for receiving a power supply voltage from a home power supply;
a normal driving module connected to the input unit to receive the power supply voltage and configured to output a first driving signal to drive the lighting module emit lights when the home power supply is normal; and
an emergency control and battery module connected to the two input terminals and the lighting module, the emergency control and battery module configured for detecting the alternating voltage of the input unit and a resistance value of a load connected between the two input terminals to determine whether the home power supply failure occurs, wherein when the home power supply failure occurs, the emergency control and battery module provides a second driving signal to drive the lighting module emit lights, when the emergency control and battery module detects the alternating voltage of the two input terminals is greater than or equal to a first predetermined value, the emergency control and battery module determines the home power supply is normal, the light module is turned off; when the emergency lighting control circuit detects the alternating voltage of the two input terminals is less than the first predetermined value, the emergency control and battery module further detects the resistance value between the two input terminals, when the resistance value between the two input terminals is less than a second predetermined value, the emergency control and battery module determines the home power supply failure occurs and provides a second driving signal to drive the lighting module emit lights, the first predetermined value is a voltage value, and the second predetermined value is a resistance value.