Residual current electrical fire monitor power supply circuit

The invention provides a residual current electrical fire monitor power supply circuit. The circuit is characterized in that a conversion power supply and a capacitor Cin access a VIN pin of a switch voltage stabilizing chip K1 and an OUT pin wiring coil L1 of K1, and then access an IN pin of a linear voltage stabilizing chip K2; resistors R17 and R18 are connected in series, and then access IN of the K2; a capacitor Cf and the R18 are connected in parallel, and then access FB of the K1; a diode D3 with a grounding positive pole is connected between the K1 and the L1; grounding capacitors C10 and C11 are connected between the IN pins of the L1 and the K2; and an OUT output line of the K2 is connected with grounding capacitors C12 and C13. The residual current electrical fire monitor power supply circuit provided by the invention has the advantages of simple circuit and reliable performance, and can effectively meet the requirements of voltage stabilizing and power supply of an electrical fire monitoring detector.