LED DOWNLIGHT POWER SUPPLY CIRCUIT AND LED DOWNLIGHT

Disclosed are an LED downlight power supply circuit and an LED downlight, the power supply circuit includes an LED drive control module, a constant voltage output module, a battery boost module, a battery, a microcontroller unit, and an alarm unit. The microcontroller unit is configured to control operating and standby states of an LED drive control circuit and the battery boost module according to an operating state of the constant voltage output module; the microcontroller unit is provided with a timer and is configured to trigger the timer to start timing when the battery is connected to supply power, and to control the alarm unit for alarming when the timer reaches a preset time limit, or to control the LED drive control module to operate intermittently. The battery can be used to power supply to the LED downlight when utility power is unavailable.