The utility model relates to the technical field of
hardware circuits of vehicle-mounted power supply inverters, and discloses a socket LED indicating lamp circuit with a real-time
fault analysis function, which comprises an LDO (
Low Dropout Regulator) controlled by an enabling pin, a socket LED indicating lamp circuit, a temperature sampling circuit, a primary side MCU (Microprogrammed
Control Unit) and an isolation communication circuit, the LDO supplies power to the primary side MCU, the socket LED indicating lamp circuit and the temperature sampling circuit in a stabilized
voltage mode. According to the utility model, under the condition that an original hardware circuit is not changed,
software programming is carried out through the primary side MCU, a real-time indication function of product faults is added, various protection state information of a product is modulated on the red LED indication lamp, an input
voltage value can be detected in real time, and overload,
short circuit, electric leakage, over-temperature and other information of an output load can be detected in real time; when relevant abnormal information is detected, the relevant abnormal information is modulated on a red LED indicator
light control signal in a PWM duty ratio mode, then the red LED indicator light of the socket is controlled and lightened, and the real-time
fault analysis function of a product is achieved.