CN210667089U

CN210667089U - Smoke alarm

Info

Publication number: CN210667089U
Application number: CN201921333019.2U
Authority: CN
Inventors: 叶龙; 马涛; 田涵朴; 崔浩田; 张鹏真
Original assignee: Henan Zilian Internet Of Things Technology Co Ltd
Current assignee: Henan Zilian Internet Of Things Technology Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-06-02
Anticipated expiration: 2029-08-16

Abstract

The utility model provides a smoke alarm, including shell and the circuit board of setting in the shell, be provided with power supply circuit, control circuit, smoke sense circuit, LED lamp, piezoelectricity passive buzzer, wireless communication circuit and electric quantity detection circuitry on the circuit board, power supply circuit is used for providing suitable voltage, control circuit connects respectively smoke sense circuit, electric quantity detection circuitry with wireless communication circuit, smoke sense circuit connects piezoelectricity passive buzzer and LED lamp, control circuit still samples the connection piezoelectricity passive buzzer. The smoke alarm has the advantages of low power consumption and false alarm prevention.

Description

Smoke alarm

Technical Field

The utility model relates to a smoke alarm.

Background

The smoke alarm mainly detects the concentration of combustible gas and smoke, sends detection signals through a wireless module or a wired module, and gives out corresponding sound-light alarm to achieve the purpose of fire alarm. The existing wireless smoke alarm generally carries out active electric quantity detection once every fixed time through a detection circuit, and alarms and reminds when the electric quantity is low, so that certain power consumption is wasted. In addition, the smoke sensing module can detect the electric quantity, and the smoke sensing module controls the buzzer to buzz and alarm for a certain number of times when the electric quantity is low, but the electric quantity detection precision of the existing smoke sensing module is low, and when the battery does not have low electric quantity actually, the buzzer can sound and alarm to make misjudgment, and the use is not reliable enough.

Disclosure of Invention

In order to solve the problem existing in the background art, the utility model provides a smoke alarm.

The utility model provides a smoke alarm, includes the shell and sets up the circuit board in the shell, be provided with power supply circuit, control circuit, smoke sensing circuit, LED lamp, piezoelectricity passive buzzer, wireless communication circuit and electric quantity detection circuitry on the circuit board, power supply circuit is used for providing suitable voltage, control circuit connects respectively smoke sensing circuit, electric quantity detection circuitry with wireless communication circuit, smoke sensing circuit connects piezoelectricity passive buzzer and LED lamp, control circuit still samples the connection piezoelectricity passive buzzer.

Based on the above, in the smoke sensing circuit, pin 3 of the smoke sensing module U3 is connected to the base of the triode Q3 through the resistor R13, the base of the triode Q3 is also grounded through the resistor R14, pin 3 of the smoke sensing module U3 is also grounded through the capacitor C9, the emitter of the triode Q3 is grounded, the collector of the triode Q3 is connected to the power VCC1 through the resistor R15, and the collector of the triode Q3 is also connected to the control circuit as the smoke sensing signal output terminal of the smoke sensing circuit; the 7 feet of the smoke sensing module U3 are connected with the 1 foot of the piezoelectric passive buzzer H1 through a resistor R16, the 1 foot of the piezoelectric passive buzzer H1 is also connected with the 8 feet of the smoke sensing module U3, the 7 foot of the smoke sensing module U3 is also connected with the 2 foot of the piezoelectric passive buzzer H1 through a capacitor C13, the 2 foot of the piezoelectric passive buzzer H1 is also connected with the 9 foot of the smoke sensing module U3, and the 7 foot of the smoke sensing module U3 is also connected with the 3 foot of the piezoelectric passive buzzer H1 through a resistor R17; the 8 feet of the smoke sensing module U3 are connected with the base electrode of a triode Q4 through a resistor R20 and are grounded through a capacitor C12, the base electrode of the triode Q4 is also grounded through a resistor R21, the emitter electrode of a triode Q4 is grounded, the collector electrode of the triode Q4 is connected with a power supply VCC1 through a resistor R22, and the collector electrode of the triode Q4 is also used as the buzzer alarm feedback end of the smoke sensing circuit to be connected with a control circuit and a wireless communication circuit; the 5 feet of the smoke sensing module U3 are connected with the LED lamp.

Based on the above, the control circuit comprises a controller U7, wherein the 11 pins of the controller U7 are connected with the smoke sensing signal output end of the smoke sensing circuit, and the 17 pins of the controller U7 are connected with the buzzer alarm feedback end of the smoke sensing circuit.

Based on the above, the wireless communication circuit further comprises a communication power supply control circuit, the communication power supply control circuit comprises a resistor R6, a resistor R5, a capacitor C15, a resistor R4 and a MOS transistor Q2, the gate of the MOS transistor Q2 is connected with the 14 pin of the controller U7 through a resistor R4, the gate of the MOS transistor Q2 is further connected with a power supply VCC1 through a resistor R5 and a capacitor C15, the source of the MOS transistor Q2 is connected with the power supply VCC1 through a resistor R6, the wireless communication circuit comprises a ZigBee module U2, and the drain of the MOS transistor Q2 is connected with the 21 pin of the ZigBee module U2.

Based on the above, in the electric quantity detection circuit, one end of the resistor R24 is connected to the power supply VCC-ADC through the resistor R23, the other end of the resistor R24 is grounded, and one end of the resistor R24 is also connected to the control circuit as a detection end.

The utility model discloses relative prior art has substantive characteristics and progress, specific theory, the utility model discloses a piezoelectric passive buzzer is connected in the control circuit sampling, and piezoelectric passive buzzer during operation awakens up control circuit promptly and carries out the electric quantity sampling, and control circuit is in low-power consumption dormant state under the normal condition, has reduced certain consumption, and need not buzzing number of times count, has reduced the erroneous judgement.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic block diagram of an electrical structure of the present invention.

Fig. 3 is a schematic diagram of the circuit structure of the smoke sensing circuit of the present invention.

Fig. 4 is a schematic diagram of the circuit structure of the control circuit of the present invention.

Fig. 5 is a schematic circuit diagram of the wireless communication circuit of the present invention.

Fig. 6 is a schematic diagram of the circuit structure of the power detection circuit of the present invention.

Fig. 7 is a schematic diagram of the circuit structure of the power supply reverse connection prevention circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

As shown in fig. 1 and 2, a smoke alarm comprises a shell 1 and a circuit board arranged in the shell 1, wherein the circuit board is provided with a power circuit, a control circuit, a smoke sensing circuit, an LED lamp, a piezoelectric passive buzzer, a wireless communication circuit and a power detection circuit, the power circuit is used for providing proper voltage, the control circuit is respectively connected with the smoke sensing circuit, the power detection circuit and the wireless communication circuit, the smoke sensing circuit is connected with the piezoelectric passive buzzer and the LED lamp, and the control circuit is also connected with the piezoelectric passive buzzer in a sampling manner.

The smoke sensing circuit is used for detecting smoke information, controlling the piezoelectric passive buzzer to perform sound alarm and controlling the LED lamp to perform light alarm according to the detected smoke information, and after receiving the smoke information detected by the smoke sensing circuit, the control circuit sends smoke alarm information to the central control host through the wireless communication circuit. The control circuit is connected with a piezoelectric passive buzzer in a sampling mode, when the piezoelectric passive buzzer works and gives an alarm, the control circuit is awakened and carries out electric quantity detection, and when the electric quantity is low, the wireless communication circuit sends an electric quantity low alarm to the central control host.

Specifically, as shown in fig. 3, in the smoke sensing circuit, pin 3 of the smoke sensing module U3 is connected to the base of the transistor Q3 through a resistor R13, the base of the transistor Q3 is also grounded through a resistor R14, pin 3 of the smoke sensing module U3 is also grounded through a capacitor C9, the emitter of the transistor Q3 is grounded, the collector of the transistor Q3 is connected to the power VCC1 through a resistor R15, and the collector of the transistor Q3 is also connected to the control circuit as the smoke sensing signal output end of the smoke sensing circuit; the 7 feet of the smoke sensing module U3 are connected with the 1 foot of the piezoelectric passive buzzer H1 through a resistor R16, the 1 foot of the piezoelectric passive buzzer H1 is also connected with the 8 feet of the smoke sensing module U3, the 7 foot of the smoke sensing module U3 is also connected with the 2 foot of the piezoelectric passive buzzer H1 through a capacitor C13, the 2 foot of the piezoelectric passive buzzer H1 is also connected with the 9 foot of the smoke sensing module U3, and the 7 foot of the smoke sensing module U3 is also connected with the 3 foot of the piezoelectric passive buzzer H1 through a resistor R17; the 8 feet of the smoke sensing module U3 are connected with the base electrode of a triode Q4 through a resistor R20 and are grounded through a capacitor C12, the base electrode of the triode Q4 is also grounded through a resistor R21, the emitter electrode of a triode Q4 is grounded, the collector electrode of the triode Q4 is connected with a power supply VCC1 through a resistor R22, and the collector electrode of the triode Q4 is also used as the buzzer alarm feedback end of the smoke sensing circuit to be connected with a control circuit and a wireless communication circuit; the 5 feet of the smoke sensing module U3 are connected with the LED lamp.

As shown in fig. 4 and 5, the control circuit comprises a controller U7, pin 11 of the controller U7 is connected to the smoke sensing signal output end of the smoke sensing circuit, and pin 17 of the controller U7 is connected to the buzzer alarm feedback end of the smoke sensing circuit. The control circuit further comprises a communication power supply control circuit, the communication power supply control circuit comprises a resistor R6, a resistor R5, a capacitor C15, a resistor R4 and a MOS tube Q2, the grid of the MOS tube Q2 is connected with the 14 pin of the controller U7 through a resistor R4, the grid of the MOS tube Q2 is further connected with a power supply VCC1 through a resistor R5 and a capacitor C15, the source of the MOS tube Q2 is connected with the power supply VCC1 through a resistor R6, the wireless communication circuit comprises a ZigBee module U2, and the drain of the MOS tube Q2 is connected with the 21 pin of the ZigBee module U2.

As shown in fig. 6, one end of the resistor R24 in the power detection circuit is connected to the power VCC-ADC through the resistor R23, the other end of the resistor R24 is grounded, and one end of the resistor R24 is also connected to the control circuit as a detection end.

In this embodiment, the model of the smoke sensing module U3 is SM100, the model of the controller U7 is PIC16LF1829, and the model of the ZigBee module is ZG _ ZM _ V1.2. After the smoke information is detected, the pin 3 of the smoke sensing module U3 outputs a high level, the triode Q3 is switched on, the pin 11 of the controller U7 is changed from a high level signal to a low level signal, and the controller U7 acquires the smoke sensing information according to the change of the high level and the low level of the pin 11. Meanwhile, a pulse signal is output by a pin 7 of the smoke sensing module U3 to control the buzzer to give an alarm, and the level of a pin 8 of the smoke sensing module U3 changes along with the change. When the level of the 8 pins of the smoke sensing module U3 is high, the triode Q4 is conducted, the 17 pins of the controller U7 are changed from high level to low level, the controller U7 carries out electric quantity detection through the electric quantity detection circuit, and when the electric quantity is low, the ZigBee module carries out low-electric quantity alarm on the central control host; when the level of the pin 8 of the smoke sensing module U3 is low, the transistor Q4 is turned off, and the pin 17 of the controller U7 changes from low level to high level. In practice, the 5 pins and the 10 pins of the smoke sensing module U3 are used for connecting red alarm LED lamps. The 14 pins of the controller U7 control the power supply of the wireless communication circuit through the communication power supply control circuit, the 14 pins of the controller U7 are at low level in a normal state, the MOS transistor Q2 is not conducted, the ZigBee module U2 is not electrified, and the power consumption is saved; when information needs to be sent, the 14 th pin of the controller U7 is at a high level, the MOS transistor Q2 is conducted, and the ZigBee module U2 is electrified to work. The 7 feet of the controller U7 are connected with a test key, the 5 feet and the 6 feet of the controller U7 are in communication connection with the 22 feet and the 23 feet of the ZigBee module U2 through an interface J1, the 9 feet are connected with an electric quantity detection circuit, the 12 feet are connected with a network access key, the 12 feet are connected with a self-checking key, and the J2 is a program downloading interface.

According to the smoke alarm provided by the embodiment, the piezoelectric passive buzzer is connected through sampling of the control circuit, the control circuit is waken up and electric quantity sampling is carried out when the piezoelectric passive buzzer works, and the control circuit is in a low-power-consumption dormant state in a normal state, so that certain power consumption is reduced; and after the control circuit is awakened to carry out active electric quantity sampling, if low electric quantity occurs, alarm information with low electric quantity is transmitted to the central control host through the wireless communication circuit, otherwise, the alarm is not carried out, so that the misjudgment condition that the buzzer rings to alarm because the battery possibly has no low electric quantity actually due to low electric quantity detection precision of the smoke sensing module is avoided, the number of buzzing times is not required to be counted, the misjudgment is further reduced, and the accuracy and reliability of low electric quantity detection of the smoke alarm are improved.

In practice, as shown in fig. 7, the power supply reverse connection prevention circuit is further included, the battery supplies power through the PMOS transistor Q1, and the MOS transistor Q1 cannot be conducted when the battery is reversely connected, so that a reverse connection prevention effect is achieved.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A smoke alarm characterised by: including shell and the circuit board of setting in the shell, be provided with power supply circuit, control circuit, smoke and feel circuit, LED lamp, piezoelectricity passive buzzer, wireless communication circuit and electric quantity detection circuitry on the circuit board, power supply circuit is used for providing suitable voltage, control circuit connects respectively smoke and feel circuit, electric quantity detection circuitry with wireless communication circuit, smoke and feel the circuit connection piezoelectricity passive buzzer and LED lamp, control circuit still samples the connection piezoelectricity passive buzzer.

2. A smoke alarm according to claim 1 wherein: the 3 feet of a smoke sensing module U3 in the smoke sensing circuit are connected with the base electrode of a triode Q3 through a resistor R13, the base electrode of the triode Q3 is grounded through a resistor R14, the 3 feet of the smoke sensing module U3 are grounded through a capacitor C9, the emitter electrode of the triode Q3 is grounded, the collector electrode of the triode Q3 is connected with a power supply VCC1 through a resistor R15, and the collector electrode of the triode Q3 is also used as a smoke sensing signal output end of the smoke sensing circuit and is connected with a control circuit; the 7 feet of the smoke sensing module U3 are connected with the 1 foot of the piezoelectric passive buzzer H1 through a resistor R16, the 1 foot of the piezoelectric passive buzzer H1 is also connected with the 8 feet of the smoke sensing module U3, the 7 foot of the smoke sensing module U3 is also connected with the 2 foot of the piezoelectric passive buzzer H1 through a capacitor C13, the 2 foot of the piezoelectric passive buzzer H1 is also connected with the 9 foot of the smoke sensing module U3, and the 7 foot of the smoke sensing module U3 is also connected with the 3 foot of the piezoelectric passive buzzer H1 through a resistor R17; the 8 feet of the smoke sensing module U3 are connected with the base electrode of a triode Q4 through a resistor R20 and are grounded through a capacitor C12, the base electrode of the triode Q4 is also grounded through a resistor R21, the emitter electrode of a triode Q4 is grounded, the collector electrode of the triode Q4 is connected with a power supply VCC1 through a resistor R22, and the collector electrode of the triode Q4 is also used as the buzzer alarm feedback end of the smoke sensing circuit to be connected with a control circuit and a wireless communication circuit; the 5 feet of the smoke sensing module U3 are connected with the LED lamp.

3. A smoke alarm according to claim 1 wherein: the control circuit comprises a controller U7, wherein the 11 pins of the controller U7 are connected with the smoke sensing signal output end of the smoke sensing circuit, and the 17 pins of the controller U7 are connected with the buzzer alarm feedback end of the smoke sensing circuit.

4. A smoke alarm according to claim 3 wherein: the wireless communication circuit further comprises a communication power supply control circuit, the communication power supply control circuit comprises a resistor R6, a resistor R5, a capacitor C15, a resistor R4 and a MOS tube Q2, the grid of the MOS tube Q2 is connected with the 14 pin of the controller U7 through a resistor R4, the grid of the MOS tube Q2 is further connected with a power supply VCC1 through a resistor R5 and a capacitor C15, the source of the MOS tube Q2 is connected with the power supply VCC1 through a resistor R6, the wireless communication circuit comprises a ZigBee module U2, and the drain of the MOS tube Q2 is connected with the 21 pin of the ZigBee module U2.

5. A smoke alarm according to claim 1 wherein: one end of a resistor R24 in the electric quantity detection circuit is connected with a power supply VCC-ADC through a resistor R23, the other end of a resistor R24 is grounded, and one end of a resistor R24 is also used as a detection end to be connected with the control circuit.