Patent Application
20220415151
The present application claims the benefit of Chinese Patent Application No. 202110697034.0 filed on Jun. 23, 2021, the contents of which are incorporated herein by reference in their entirety.
The present invention relates to the technical field of CO alarms, and in particular to a CO alarm for a battery type generator.
Portable generators are widely used because of their small size, mobility, and strong adaptability to the working environment, etc. However, because this type of generator drives a magneto to output power using a gasoline engine, a large amount of CO harmful gas will be generated during use. In many household applications, many accidents of casualties happen because of ignoring the CO emission problems. In many countries, to meet the safety requirements, mandatory installation of CO alarms has been implemented. In order to meet the market demands, the present invention provides a CO alarm for a battery type generator.
In order to overcome the shortcomings of the prior art, the present invention provides a CO alarm for a battery type generator.
In order to achieve the above object, the present invention adopts the following technical solutions. 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;
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; when the generator generates excessive CO, the CO concentration in the environment is converted into a corresponding electrical signal by the CO sensor detection unit U3 to output to the MCU control unit U2 for processing. After processing by the MCU control unit U2, the signal is sent to the alarm indication unit and the flameout control unit, to give an alarm prompt of the CO concentration and shut down the generator, thereby preventing safety accidents.
Preferably, the battery supply unit comprises a battery BT1 and a capacitor C1.
Preferably, the MCU control unit U2 comprises a single-chip microcomputer IC1, a capacitor C3, a resistor R6 and a capacitor C4.
Preferably, the CO sensor detection unit U3 comprises a sensor anti-polarization circuit, a sensor self-checking circuit, a primary amplifying circuit, a sensor J3, a primary filter, an operational amplifying unit IC2_2, a secondary amplifying circuit, an operational amplifying unit IC2_1 and a filter circuit.
Preferably, the alarm indication unit U4 comprises a lamp LED4, a lamp LED3, a resistor R27 and a resistor R28.
Preferably, the speed detection unit U5 comprises a normally-closed circuit, a resistor R1, a resistor R3, a resistor R4, an externally connected engine igniter flameout module LO_CO, a diode D1, a transistor Q1, a MOS transistor Q2, a resistor R4 and a capacitor C10.
Preferably, the flameout control unit U6 comprises a switch tube Q1, a resistor R17, a resistor 18 and a capacitor C6.
In summary, when the generator generates excessive CO, the CO concentration in the environment is converted into a corresponding electrical signal by the CO sensor detection unit U3 to output to the MCU control unit U2 for processing. After processing by the MCU control unit U2, the signal is sent to the alarm indication unit and the flameout control unit, to give an alarm prompt of the CO concentration and shut down the generator, thereby preventing safety accidents.
As shown in
Specifically, the CO sensor detection unit U3 detects the concentration of CO gas and outputs a weak electrical signal, amplifies and outputs the weak electrical signal to the MCU control unit U2, and it includes a sensor anti-polarization circuit, a sensor self-checking circuit, a primary amplifying circuit, a sensor J3, a primary filter, a secondary amplifying circuit, a capacitor C5, an operational amplifying unit IC2_2, a resistor 19, a capacitor C19 and a filter circuit. The sensor anti-polarization circuit is composed of a resistor R9 and a switch tube Q3; the sensor self-checking circuit is composed of a resistor R11, a switch tube Q4, and a resistor R21; the primary amplifying circuit is composed of a resistor R14, a resistor R10, a capacitor C8, a resistor R15, and an operational amplifying unit IC2_1, and can amplify the electrical signal output by the sensor J3; the capacitor C5 adopts a filter capacitor, and the primary filter can be formed by the resistor R15 and the capacitor C5. The primary amplifying circuit amplifies the electrical signal output by sensor J3, and forms a primary filter through R15 and C5 and transmits it to the operational amplifying unit IC2_2; the secondary amplifying circuit is composed of a resistor R22 and a resistor R23. The filter circuit is configured to filter the operational amplifying unit IC2_2 and operational amplifying unit IC2_1 by the capacitor C18 and capacitor C19, and input to an AD1 port of the U2 module IC1 through the resistor R19 and the capacitor C17.
Specifically, the alarm indication unit U4 includes a lamp LED4, a lamp LED3, a resistor R27, and a resistor R28. The lamp LED4 is a red lamp and is connected to the I/O4 pin of the single-chip microcomputer IC1 for CO concentration alarm indication. The CO concentration alarm indication includes CO concentration peak alarm indication and CO average concentration alarm indication; the lamp LED3 is a yellow lamp and is connected to the I/O3 pin of the single-chip microcomputer IC1 for module fault alarm indication. The fault alarm indications include battery low-voltage fault indication, alarm high-temperature fault indication, sensor fault indication, etc.; the resistor R27 and resistor R28 are current-limiting resistors.
Preferably, the speed detection unit U5 includes a normally-closed circuit, a resistor R1, a resistor R3, a resistor R4, an externally connected engine igniter flameout module LO_CO, a diode D1, a transistor Q1, a MOS transistor Q2, a resistor R4, and a capacitor C10; the normally-closed circuit is composed of a MOS transistor Q2, a resistor R2, a capacitor C2, and an I/O5 pin of a single-chip microcomputer IC1; the resistor R1 is a pull-up resistor for the speed signal; the resistor R3 is a base current-limiting resistor of the transistor Q1; the resistor R4 is a pull-down bias resistor of the diode Q1 to prevent the diode Q1 from being triggered by mistake; the diode D1 prevents the input voltage from the externally connected engine igniter flameout module LO_CO from entering the module; the capacitor C10 is the filter capacitor, which filters the detected speed signal and inputs it to the I/O6 pin of the single-chip microcomputer IC1.
Specifically, the flameout control unit U6 includes switch tube Q5, a resistor R17, a resistor 18, and a capacitor C6; the resistor R17 and the switch tube Q5 control the ignition trigger voltage input by the externally connected engine igniter flameout module LO_CO, which is directly connected to the ground when flameout is necessary, to achieve the purpose of igniter flameout; the resistor R18 and the capacitor C6 form a filter circuit to prevent the switch tube Q5 from being triggered by mistake.
Specifically, the battery power supply unit includes a battery BT1 and a capacitor C1, and the battery BT1 is a non-rechargeable battery; the capacitor C1 is a filter capacitor that filters the battery output voltage.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110697034.0 | Jun 2021 | CN | national |
