Fecha de publicación: 28/09/2021 Fuente: Wipo Tobacco Agriculture The utility model discloses a multi-path seedling raising plate water temperature monitoring protection circuit. IN1 and IN2 are respectively detection signals of water temperature in a seedling plate I and a seedling plate II; d1 is an over-temperature display diode in the first seedling tray, D2 is an over-temperature display diode in the second seedling tray, the anode end of D3 is over-temperature protection output of the first seedling tray, the anode end of D4 is over-temperature protection output of the second seedling tray, and the anode ends of D3 and D4 are connected together to achieve a hardware isolation effect and serve as output of a whole protection signal OUT; the circuit can provide multiple temperature protection circuits at the same time, each temperature protection circuit can perform over-temperature protection and output respective protection signals, and the output protection signals among the multiple protection circuits are isolated from each other through hardware without crosstalk; meanwhile, the multi-channel display function is achieved, the over-temperature conditions in different seedling trays can be displayed at the same time, the unattended seedling raising environment is powerfully supported, and the good economic purpose is achieved.