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

Claim 0:
1. An emergency light, comprising
a lighting module configured for emitting lights;
an input unit comprising two input terminals configured for receiving an alternating voltage from a home power supply;
a rectifying circuit connected to the input unit to receive the alternating voltage and output a first direct voltage;
a normal lighting control circuit connected between the rectifying circuit and the lighting module, the normal lighting control circuit configured for receiving the first direct voltage and outputting a first driving signal to drive the lighting module emit lights when the home power supply is normal;
a battery; and
an emergency lighting control circuit connected to the two input terminals and the battery, the emergency lighting control circuit 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 lighting control circuit and the battery provides a second driving signal to drive the lighting module emit lights, when the emergency lighting control circuit detects the alternating voltage of the two input terminals is greater than or equal to a first predetermined value, the emergency lighting control circuit 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 lighting control circuit 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 lighting control circuit determines the home power supply failure occurs, the battery 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.