Co alarm for battery type generator

A CO alarm for a battery type generator, comprising:

• a MCU control unit (U2), configured to analyze and process signals, which is in a deep sleep state when the generator is not running, and enters a sleep plus timing wake-up working state after the engine is running;
• a CO sensor detection unit (U3) connected to the MCU control unit, configured to convert the CO concentration in the environment into a corresponding electrical signal and output to the MCU control unit (U2) for processing, the CO sensor detection unit (U3) comprises a sensor anti-polarization circuit, a sensor self-checking circuit, a primary amplifying circuit, a primary filter, a sensor (J3), a secondary amplifying circuit and a filter circuit;
• an alarm indication unit (U4) connected to the MCU control unit, configured to give an alarm prompt for the CO concentration and an alarm failure prompt;
• a speed detection unit (U5) connected to the MCU control unit, configured to collect the running status of the generator and wake up the MCU control unit (U2) from the deep sleep state to the normal working state;
• a flameout control unit (U6) connected to the MCU control unit, configured to shut down the generator when the alarm fails or the CO concentration alarms;
• a battery power supply unit (U1), configured to provide a working power supply required for the entire CO alarm;
• wherein, the sensor anti-polarization circuit comprises a first resistor (R9) and a first switch tube (Q3);
• the sensor self-checking circuit comprises a second resistor (R11), a second switch tube (Q4) and a third resistor (R21);
• the primary amplifying circuit comprises a fourth resistor (R14), a fifth resistor (R10), a first capacitor (C8), a sixth resistor (R15), and a first operational amplifying unit (IC2_1), and is configured to amplify an electrical signal output by the sensor (J3);
• the primary filter comprises a seventh resistor (R13) and a second capacitor (C5), and is configured to filter and transmit the electrical signal amplified by the primary amplifying circuit to the secondary amplifying circuit;
• the secondary amplifying circuit comprises a second operational amplifying unit (IC2_2), a third capacitor (C18), a fourth capacitor (C19), an eighth resistor (R22) and a ninth resistor (R23), and is configured to amplify the electrical signal from the primary filter;
• the filter circuit comprises a tenth resistor (R19) and a fifth capacitor (C17), and is configured to filter and transmit the electrical signal amplified by the second amplifying circuit to the MCU control unit (U2).