An alarm apparatus for preventing leaving child in a vehicle, comprising:
- a power supply circuit configure to supply power to the alarm apparatus;
- a central processing unit;
- a communication module electrically coupled to the central processing unit, wherein the communication module is configured to transmit alarm information to an external communication terminal in response to a control of the central processing unit;
- a vehicle condition monitoring device electrically coupled to each of the central processing unit and a vehicle battery of the vehicle, wherein the vehicle condition monitoring device is configured to sample a power output of the vehicle battery to the vehicle to detect whether the vehicle is currently in a stall state and transmit a detection result to the central processing unit;
- at least an infrared monitor electrically coupled to the central processing unit, wherein the infrared monitor is configured to monitor whether there is a human in the vehicle in response to a control of the central processing unit and transmit a human monitoring result to the central processing unit;
- and
- a temperature sensor electrically coupled to the central processing unit, wherein the temperature sensor is configured to monitor a temperature inside the vehicle in response to a control of the central processing unit and transmit a temperature detection result to the central processing unit such that the central processing unit control the communication module to transmit the alarm information to the external communication terminal based on the temperature detection result;
- wherein, the central processing unit is configured to control the communication module to transmit the alarm information to the external communication terminal after the vehicle is stalled for a predetermined duration according to the human monitoring result received from the infrared monitor and the detection result received from the vehicle condition monitoring device in response to the infrared monitor having detected a human in the vehicle and the vehicle condition monitoring device having detected the vehicle being in the stall state;
- wherein the power supply circuit includes:
- a power supply;
- wherein, a power input end of the power supply is electrically coupled to an output end of a buck circuit, and an input end of the buck circuit is electrically coupled to the vehicle battery;
- a power output end of the power supply is electrically coupled to a rechargeable battery, and the power output end of the power supply is further electrically coupled to an input end of the buck circuit, and the output end of the buck circuit is electrically coupled to an power input end of the central processing unit;
- the power output end of the power supply is further electrically coupled to a switch circuit and an input end of a boost circuit that are connected in series, and a control end of the switch circuit is electrically coupled to the central processing unit, and an output end of the boost circuit is electrically coupled to each of the infrared monitor and an power input end of the temperature sensor, and the rechargeable battery is electrically coupled to a power input end of the communication module.