CN211087484U

CN211087484U - R7F0C004M2 DFB-based 119 anti-reverse alarm circuit

Info

Publication number: CN211087484U
Application number: CN201921937071.9U
Authority: CN
Inventors: 郑小云
Original assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Current assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Priority date: 2019-11-12
Filing date: 2019-11-12
Publication date: 2020-07-24
Anticipated expiration: 2029-11-12

Abstract

The utility model discloses a 119 prevent anti-alarm circuit based on R7F0C004M2 DFB. The utility model discloses a singlechip, voltage regulator chip, first filter capacitor, second filter capacitor, third filter capacitor, fourth electric capacity, fifth filter capacitor, first resonance electric capacity, second resonance electric capacity, first prevent reverse diode, second prevent reverse diode, crystal oscillator, restriction oscillation amplitude resistance, second resistance, first filter inductance, second filter inductance, 119 interfaces. Through the utility model discloses when causing gas table or gas pipeline gas leakage because of the external reason, outside 119 prevents that alarm circuit can sense and send alarm sound after the gas, and the main control board of gas table detects outside 119 and prevents the action of preventing alarm circuit simultaneously, and the signal with gas leakage reports to the platform on through communication module, and the gas company can know the time and the place of gas table gas leakage in customer's family through the platform to the very first time contacts the customer.

Description

R7F0C004M2 DFB-based 119 anti-reverse alarm circuit

Technical Field

The utility model belongs to the technical field of instrument intelligent control, a gas table 119 is prevented reversing alarm circuit is related to.

Background

With the development of microprocessors and the technology of the internet of things, many devices are provided with 119 anti-reflection alarm circuits, and instrument electronic products are no exception. When the gas meter is installed in a customer home, the alarm can not be given under the normal condition, when the gas meter or a gas pipeline leaks gas due to external reasons, the external 119 anti-reflection alarm circuit can sense gas and then send out alarm sound, meanwhile, the main control board of the gas meter detects the action of the external 119 anti-reflection alarm circuit, the gas leakage signal is reported to the platform through the communication module, a gas company can know the time and the place of gas meter gas leakage in the customer home through the platform, thereby contacting the customer at the first time, knowing the specific situation and eliminating various hidden dangers, and further better serving the customer. Therefore, a 119 anti-reverse alarm circuit based on the R7F0C004M2DFB is designed.

Disclosure of Invention

The utility model aims at providing a 119 prevent anti-alarm circuit based on R7F0C004M2 DFB.

The utility model discloses a singlechip U2, voltage regulator chip U1, first filter capacitance C1, second filter capacitance C2, third filter capacitance C3, fourth electric capacity C4, fifth filter capacitance C5, first resonance electric capacity C7, second resonance electric capacity C8, first anti-reverse diode D1, second diode D2, the second is prevented anti-reverse diode D3, crystal oscillator X1, limit and shake amplitude resistance R1, second resistance R2, first filter inductance FB1, second filter inductance FB2, 119 interface P2;

the 1 st pin of the first power supply right-angle bent seat P1 is connected with the anode of a first anti-reverse diode D1, and the 2 nd pin of the first power supply right-angle bent seat P1 is grounded; the cathode of the first anti-reverse diode D1 is connected with an input pin (2 nd pin) of the voltage regulator chip U1; an output pin (3 rd pin) of the voltage regulator chip U1 is connected with one end of the first filter capacitor C1 and the anode of the second filter capacitor C2; the grounding pin (No. 2 pin) of the voltage regulator chip U1 is connected with the ground; the other end of the first filter capacitor C1 and the negative electrode of the second filter capacitor C2 are both grounded;

the 18 th pin of the singlechip U2 is connected with one end of a fifth filter capacitor C5 and the anode of a second filter capacitor C2, and the other end of the fifth filter capacitor C5 is connected with the ground; the 17 th pin of the singlechip U2 is grounded; the 10 th pin of the singlechip U2 is connected with the anode of a second diode D2; the cathode of the second diode D2 is connected with one end of the second resistor R2, and the anode of the second diode D2 is connected with the other end of the second resistor R2; the anode of the second diode D2 is connected to one end of the fourth capacitor C4, and the other end of the fourth capacitor C4 is connected to ground;

a pin 11 of the singlechip U2 is connected with one end of a shock amplitude limiting resistor R1, and the other end of the shock amplitude limiting resistor R1 is connected with one end of a crystal oscillator X1 and one end of a first resonant capacitor C7; the other end of the crystal oscillator X1 is connected with one end of a second resonance capacitor C8 and then is connected with a 12 pin of the single chip microcomputer; the other ends of the first resonant capacitor C7 and the second resonant capacitor C8 are grounded.

A 69 th pin of the singlechip U2 is connected with one end of a third filter capacitor C3 and one end of a first filter inductor FB1 at the same time, the other end of the first filter inductor FB1 is connected with the anode of a second anti-reverse diode D3, and the other end of the third filter capacitor C3 is connected with one end of a second filter inductor FB2 and grounded at the same time; the cathode of the second anti-reverse diode D3 is connected with the 1 st pin of the 119 interface P2; the other end of the second filter inductor FB2 is connected to pin 2 of the 119 nd interface P2.

The invention has the following beneficial effects:

the utility model discloses circuit design is simple, low power dissipation to a small amount of components and parts realize preventing the design of anti-alarm circuit to gas meter 119. The PCB area is saved, the miniaturization of equipment is facilitated, and the raw material cost is reduced.

Through the utility model discloses when causing gas table or gas pipeline gas leakage because of the external reason, outside 119 prevents that alarm circuit can sense and send alarm sound after the gas, the main control board of gas table detects outside 119 and prevents the action of preventing alarm circuit simultaneously, report the platform on the signal block of gas leakage, the gas company can know the time and the place of gas table gas leakage in the customer family through the platform, thereby the very first time contacts the customer, know the particular case, get rid of various hidden dangers, thereby better service client.

And when a customer is in an unknown condition and charges a gas meter at home, the 119 interface P2 is mistakenly used as a household 12V adapter interface, and at the moment, a second anti-reverse diode D3 in the 119 anti-reverse alarm circuit in the gas meter main control board plays a role in preventing reverse, so that power supply for the main control board from the outside is prevented, and the main control board is protected.

Drawings

FIG. 1 is a 119 anti-reverse alarm circuit of the present invention;

fig. 2 is a schematic diagram of a waveform of a detection pin P13 of the single chip microcomputer after the gas leakage of the gas meter or the pipeline in the invention;

Detailed Description

In order to explain technical contents, structural features, and achieved effects of the present invention in detail, the following detailed description is made with reference to the accompanying drawings in combination with the embodiments.

As shown in figures 1 and 2, a 119 anti-reverse alarm circuit based on an R7F0C004M2 DFB.

The utility model discloses the working process is as follows:

as shown in fig. 2, the first power supply right-angle bent seat P1 provides a 3.6V power supply, which passes through the first anti-reverse diode D1 and then outputs 3.3V to the voltage regulator chip U1, and then passes through the first filter capacitor C1, the second filter capacitor C2 and the fifth filter capacitor C5 to supply power to the single chip U2 and to the light-emitting diode D3. After the system is powered on, the singlechip U2 is reset through the reset circuit, the second resistor R2 and the fourth capacitor C4, and when the system is powered off, the second diode D2 can quickly discharge the voltage at the two ends of the fourth capacitor C4 to prepare for resetting the singlechip on next time; meanwhile, a crystal oscillator X1, an oscillation amplitude limiting resistor R1, a first resonant capacitor C7 and a second resonant capacitor C8 in the crystal oscillator circuit start to provide an accurate clock signal 32.768KHz for the singlechip U2, and all instructions of the singlechip are executed on the basis.

When an external gas meter and a gas pipeline are in a normal gas-tight state, a 69 th pin P13 of the single chip microcomputer U2 is set to be in an internal pull-up state through software, at the moment, an external 119 interface P2 is in a non-conduction state, and the 69 th pin P13 of the single chip microcomputer U2 detects a high level; when the gas meter or the gas pipeline leaks gas, the external 119 interface is in a conducting state, the 69 th pin P13 of the single chip microcomputer U2 detects a low level, the rear single chip microcomputer U2 transmits the information to a platform of a gas meter company through a serial port, the platform learns that the gas meter or the gas pipeline leaks gas at home of a client, the client is contacted at the first time, potential safety hazards are eliminated, and service is provided for the client. When a customer is in an unknown condition and charges a gas meter at home, the 119 interface P2 is mistakenly used as a household 12V adapter interface, and the second anti-reverse diode D3 in the 119 anti-reverse alarm circuit in the gas meter main control board plays a role in preventing reverse, so that power supply for the main control board from the outside is prevented, and the main control board is protected.

Claims

1. A119 anti-reverse alarm circuit based on an R7F0C004M2DFB is characterized by comprising a single chip microcomputer U2, a voltage regulator chip U1, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, a fourth capacitor C4, a fifth filter capacitor C5, a first resonant capacitor C7, a second resonant capacitor C8, a first anti-reverse connection diode D1, a second diode D2, a second anti-reverse connection diode D3, a crystal oscillator X1, an oscillation amplitude limiting resistor R1, a second resistor R2, a first filter inductor FB1, a second filter inductor FB2 and a 119 interface P2;

the 1 st pin of the first power supply right-angle bent seat P1 is connected with the anode of a first anti-reverse diode D1, and the 2 nd pin of the first power supply right-angle bent seat P1 is grounded; the cathode of the first anti-reverse diode D1 is connected with an input pin of the voltage regulator chip U1; an output pin of the voltage regulator chip U1 is connected with one end of the first filter capacitor C1 and the anode of the second filter capacitor C2; the grounding pin of the voltage regulator chip U1 is connected with the ground; the other end of the first filter capacitor C1 and the negative electrode of the second filter capacitor C2 are both grounded;

a pin 11 of the singlechip U2 is connected with one end of a shock amplitude limiting resistor R1, and the other end of the shock amplitude limiting resistor R1 is connected with one end of a crystal oscillator X1 and one end of a first resonant capacitor C7; the other end of the crystal oscillator X1 is connected with one end of a second resonance capacitor C8 and then is connected with a 12 pin of the single chip microcomputer; the other ends of the first resonant capacitor C7 and the second resonant capacitor C8 are grounded;