CN213517056U

CN213517056U - Hand-held type carbon monoxide detector appearance

Info

Publication number: CN213517056U
Application number: CN202022485699.9U
Authority: CN
Inventors: 钟心全; 黄海泉; 陈联
Original assignee: Dongguan Wanchuang Electronic Products Co ltd
Current assignee: Dongguan Wanchuang Electronic Products Co ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-06-22
Anticipated expiration: 2030-10-30

Abstract

The utility model relates to a hand-held carbon monoxide detector, which comprises a carbon monoxide gas detection circuit, a signal conversion circuit, an ADC module, a processor, a display, an alarm circuit, a key and a portable power supply, the signal conversion circuit is used for converting a current signal into a voltage signal to be output, the carbon monoxide gas detection circuit, the signal conversion circuit, the ADC module and the processor are electrically connected in sequence, the processor is respectively and electrically connected with the display, the alarm circuit and the keys, the portable power supply supplies power to the handheld carbon monoxide detector, the portable carbon monoxide detector also comprises a low-current detection circuit, the low-current detection circuit comprises a resistor R9, a resistor R10 and a capacitor C4, the power supply voltage B + of the portable power supply is connected to the ground through a resistor R9 and a resistor R10 in sequence, a joint between the resistor R9 and the resistor R10 serves as output and is connected to the ADC module, and the capacitor C4 is connected with the resistor R10 in parallel. The utility model discloses can realize the low electricity of hand-held type carbon monoxide detector and remind.

Description

Hand-held type carbon monoxide detector appearance

Technical Field

The utility model belongs to the technical field of gaseous detection and specifically relates to a hand-held type carbon monoxide detector.

Background

Carbon monoxide leakage is possible to generate in scenes such as gas furnaces, central heating furnaces, central heaters, water heaters, wave band ovens, fireplaces, furnaces and the like, so that a carbon monoxide detector is generated for detecting the content of carbon monoxide. The conventional carbon monoxide detector comprises a carbon monoxide gas sensor circuit, a signal conversion circuit for converting current into voltage, a processor, a display, an alarm and corresponding operation keys.

Along with the technical development, portable small becoming the general pursuit of trade, the carbon monoxide detector has also improved and has increased the battery, utilizes battery and battery management circuit to the carbon monoxide detector, realizes that the handheld portable removal of carbon monoxide detector can, nevertheless to this type of handheld carbon monoxide detector, owing to do not have the low electricity prompt facility of setting up, often leads to the carbon monoxide detector to be unable to use at the job site because of the battery loses the electricity, influences customer experience.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a hardware architecture of hand-held type carbon monoxide detector appearance, it can realize the low electricity warning of hand-held type carbon monoxide detector appearance after software personnel program the treater.

In order to achieve the above purpose, the technical scheme of the utility model is that:

the utility model provides a hand-held type carbon monoxide detector, includes carbon monoxide gas detection circuitry, signal conversion circuit, ADC module, treater, display, alarm circuit, button, portable power, signal conversion circuit is used for converting current signal into voltage signal output, carbon monoxide gas detection circuitry, signal conversion circuit, ADC module, treater electricity in proper order connect, display, alarm circuit, button are connected to the treater electricity respectively, portable power supplies power for hand-held type carbon monoxide detector, still includes low electricity detection circuitry, and low electricity detection circuitry contains resistance R9, resistance R10, electric capacity C4, the supply voltage B + of portable power is connected to ground through resistance R9, resistance R10 in proper order, and the contact between resistance R9, the resistance R10 inserts as the output to the ADC module, electric capacity C4 shunt resistance R10.

Furthermore, the portable power supply is a battery which is detachably concealed in the handheld carbon monoxide detector.

Furthermore, a power management circuit is further arranged in the carbon monoxide detector, and the battery supplies power to the handheld carbon monoxide detector through the power control circuit.

Further, the battery is provided with a plurality of batteries which are connected in series and in parallel to form a battery pack.

Further, the alarm circuit is specifically a buzzer circuit.

Furthermore, the display back ring is provided with a backlight circuit connected with the processor, and the backlight circuit is controlled to start to output backlight for the display.

Further, the ADC module is an ADC channel of the processor.

Further, the ADC voltage reference circuit is further included and is used for providing high-precision ADC reference voltage for the processor.

Further, the ADC voltage reference circuit is realized by a chip LC 1463-15.

Further, the temperature detection circuit comprises a resistor R20, a thermistor chip R19 and a capacitor C19, the power supply voltage in the handheld carbon monoxide detector is sequentially connected to the ground through the resistor R20 and the thermistor chip R19, a connection point between the resistor R20 and the thermistor chip R19 serves as an output end of the temperature detection circuit and is connected to the ADC module, and the capacitor C19 is connected to two ends of the thermistor chip R19 in parallel.

The utility model discloses a set up low-current detection circuitry, after software personnel to treater programming, the treater can be based on the change of the portable mains operated voltage B + of partial pressure principle perception, when supply voltage B + dropped to setting for under the threshold value, treater drive alarm circuit reported to the police, realizes the low-current warning of hand-held type carbon monoxide detector appearance.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout the drawings. In the drawings:

fig. 1 shows a schematic front view of a hand-held carbon monoxide detector according to the present invention;

FIG. 2 is a schematic view of the back side of the hand-held carbon monoxide detector of the present invention;

FIG. 3 illustrates a system block diagram of the hand-held carbon monoxide detector of the present invention;

FIG. 4 shows a circuit diagram of a temperature detection circuit;

FIG. 5 shows a circuit diagram of a low current detection circuit;

fig. 6 shows a circuit diagram of an ADC voltage reference circuit.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

As shown in fig. 1 to 3, the handheld carbon monoxide detector of this embodiment includes a carbon monoxide gas detection circuit 1, a signal conversion circuit 2, a CPU processor 3, an alarm circuit 4, a display 5, a temperature detection circuit 6, a low-power detection circuit 7, an ADC voltage reference circuit 8, and a key 9.

The carbon monoxide gas detection circuit 1 comprises a carbon monoxide gas sensor for detecting the content of carbon monoxide gas and converting the carbon monoxide gas into a current signal, wherein a probe 11 of the carbon monoxide gas sensor is arranged at the end part of the detector shell as shown in fig. 1 so as to be convenient for approaching the detected object.

The signal conversion circuit 2 is a conventional current-to-voltage signal processing circuit, and is used for acquiring a current value from an output end of the signal conversion circuit 2, converting the current value into a corresponding voltage value and sending the voltage value to an ADC (analog to digital converter) channel of a chip of the CPU processor 3, converting the voltage value into a digital quantity by the ADC channel and sending the digital quantity to the CPU processor 3 for processing, and the CPU processor 3 processes and analyzes the digital quantity and then transmits the digital quantity to the display 5 for displaying for a measurer to read. The display 5 is an LCD display screen, and cost control is achieved. In order to facilitate the testers to watch the screen during night operation, the back ring of the display 5 is provided with a backlight circuit connected with the CPU processor 3, the backlight circuit is controlled to be started to output backlight for the display 5, and the testers are ensured to conveniently check and display numerical values.

In order to simplify the circuit and reduce the cost, the alarm circuit 4 is specifically set as a buzzer circuit, and when the content of carbon monoxide exceeds the standard (higher than 24ppm), the CPU processor 3 drives the buzzer circuit to alarm in a sound mode, so that a tester is prompted to pay attention to potential dangers. The alarm value of 24ppm is a factory default value and can be set by a user.

Because the environment needing carbon monoxide gas detection is always accompanied by high temperature and even open fire, the handheld carbon monoxide detector is also provided with a temperature detection circuit 6 as shown in fig. 4, the temperature detection circuit 6 specifically comprises a resistor R20, a thermistor sheet R19 and a capacitor C19, when the handheld carbon monoxide detector is connected, VREF +15V power supply voltage inside the handheld carbon monoxide detector is sequentially connected to the ground through the resistor R20 and the thermistor sheet R19, a joint between the resistor R20 and the thermistor sheet R19 is used as an output end of the temperature detection circuit 6 to be connected to an ADC channel of the CPU processor 3, the thermistor sheet R19 induces temperature change to cause the resistance change of the thermistor sheet, and finally the partial pressure of the joint between the resistor R20 and the thermistor sheet R19 is changed, and the CPU processor 3 senses the change to convert the external temperature for displaying and giving an alarm when the temperature is overhigh. In the temperature detection circuit 6, a capacitor C19 is connected in parallel to two ends of the thermistor R19 for filtering.

For realizing portablely can hand, the power of carbon monoxide detector is provided by the lithium cell group that a plurality of lithium cells connected in series and parallel each other formed, see fig. 1, and the backshell of carbon monoxide detector is equipped with the battery jar, and lithium cell group places in the battery jar to sealed by battery door A. Wherein, the battery door A and the battery jar are detachably assembled. The carbon monoxide detector is also provided with a power supply management circuit which is not shown in the figure, and the lithium battery pack supplies power to all electronic devices of the carbon monoxide detector through the power supply control circuit.

In order to realize low-power reminding and take cost into consideration, as shown in fig. 5, a low-power detection circuit 7 is arranged in the carbon monoxide detector, the low-power detection circuit 7 is composed of a resistor R9, a resistor R10 and a capacitor C4, the power supply voltage B + of the lithium battery pack is connected to the ground through the resistor R9 and the resistor R10 in sequence, a contact between the resistor R9 and the resistor R10 is used as an ADC channel for outputting and connecting the output to the CPU processor 3, the CPU processor 3 senses the change of the power supply voltage B + of the lithium battery pack by adopting the voltage division principle, and when the power supply voltage B + is reduced to a set threshold value, the CPU processor 3 drives a buzzer to perform sound alarm at different frequencies. The capacitor C4 is connected with the resistor R10 in parallel for filtering.

Because the detection of the carbon monoxide detector is implemented by relying on an ADC channel of the CPU 3, in order to ensure the detection accuracy, an ADC voltage reference circuit 8 shown in FIG. 6 is arranged in the carbon monoxide detector to provide a high-precision ADC reference voltage for the CPU 3, wherein the core of the ADC voltage reference circuit 8 is implemented by chips LC1463-15, and the voltage precision of the reference voltage is ensured by the chips LC 1463-15.

As shown in fig. 1, the front of the carbon monoxide detector is provided with a key 9, the key 9 is divided into a power-off key, a temperature/carbon monoxide detection converter, a backlight key and a MODE key, the four keys are respectively connected with four IO of the CPU processor 3 to realize man-machine interaction, and the CPU processor 6 can be triggered to execute corresponding functions by pressing the corresponding keys.

It should be finally noted that the above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced with other equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. The utility model provides a hand-held type carbon monoxide detector, includes carbon monoxide gas detection circuitry, signal conversion circuit, ADC module, treater, display, alarm circuit, button, portable power source, signal conversion circuit is used for converting current signal into voltage signal output, carbon monoxide gas detection circuitry, signal conversion circuit, ADC module, treater electricity in proper order are connected, display, alarm circuit, button are connected to the treater electricity respectively, portable power source supplies power for hand-held type carbon monoxide detector, its characterized in that:

the low-power detection circuit comprises a resistor R9, a resistor R10 and a capacitor C4, the power supply voltage B + of the portable power supply is connected to the ground through the resistor R9 and the resistor R10 in sequence, a joint between the resistor R9 and the resistor R10 is used as output and connected to the ADC module, and the capacitor C4 is connected with the resistor R10 in parallel.

2. The hand-held carbon monoxide detector as set forth in claim 1, wherein: the portable power supply is a battery which is detachably concealed in the handheld carbon monoxide detector.

3. The hand-held carbon monoxide detector as set forth in claim 2, wherein: the carbon monoxide detector is also internally provided with a power management circuit, and the battery supplies power to the handheld carbon monoxide detector through the power control circuit.

4. The hand-held carbon monoxide detector as set forth in claim 3, wherein: the battery is provided with a plurality of batteries which are connected in series and in parallel to form a battery pack.

5. The hand-held carbon monoxide detector as set forth in claim 1, wherein: the alarm circuit is specifically a buzzer circuit.

6. The hand-held carbon monoxide detector as set forth in claim 1, wherein: the display back ring is provided with a backlight circuit connected with the processor, and the backlight circuit is controlled to start to output backlight for the display.

7. The hand-held carbon monoxide detector as set forth in claim 1, wherein: the ADC module is an ADC channel of the processor.

8. The hand-held carbon monoxide detector as set forth in claim 7, wherein: the ADC voltage reference circuit is used for providing high-precision ADC reference voltage for the processor.

9. The hand-held carbon monoxide detector as set forth in claim 8, wherein: the ADC voltage reference circuit is implemented by a chip LC 1463-15.

10. The hand-held carbon monoxide detector as set forth in claim 1, wherein: the temperature detection circuit comprises a resistor R20, a thermistor R19 and a capacitor C19, the power voltage in the handheld carbon monoxide detector is sequentially connected to the ground through the resistor R20 and the thermistor R19, a joint between the resistor R20 and the thermistor R19 serves as the output end of the temperature detection circuit to be connected into the ADC module, and the capacitor C19 is connected to two ends of the thermistor R19 in parallel.