CN210895753U

CN210895753U - Alarm circuit based on prevent misconnection and interference killing feature is strong

Info

Publication number: CN210895753U
Application number: CN201921432410.8U
Authority: CN
Inventors: 伍喆; 毛程权
Original assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Current assignee: Zhejiang Viewshine Intelligent Meter Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-06-30
Anticipated expiration: 2029-08-30

Abstract

The utility model provides an alarm circuit based on prevent misconnection and interference killing feature is strong, the utility model discloses the power provides 3V-6V's power, and the IO mouth of singlechip is through using the inside high level of pull-up resistance output. If no alarm is triggered, the circuit is open, and the IO port of the singlechip is continuously at a high level; when the alarm is triggered, the circuit is in a conducting state, the IO port of the single chip microcomputer is still in a low level after being scanned for multiple times, the alarm signal is an alarm signal and timely instructs, and if the IO port of the single chip microcomputer is not in the low level after being scanned for multiple times, the single chip microcomputer is regarded as false alarm and does not process the false alarm. The circuit of the utility model has simple design, is beneficial to the miniaturization of equipment and reduces the cost of raw materials; the double magnetic beads greatly improve the anti-interference capability of the alarm circuit, and the diode effectively prevents the problem that the single chip microcomputer is damaged due to the misconnection of the interface.

Description

Alarm circuit based on prevent misconnection and interference killing feature is strong

Technical Field

The utility model belongs to the technical field of instrument intelligent control, a alarm circuit based on two paster magnetic beads are used for improving the interference killing feature and a diode is used for preventing misconnection is related to.

Background

Along with the development of the microprocessor and the artificial intelligence technology, the development of the instrument industry to intellectualization is achieved, namely the intelligent level of the instruments of the intelligent robot is improved, the intelligent level is improved, the speed is increased quickly, and the life of people is easier.

The meter electronics directly affects the safety of the user and the meter must be able to accurately detect the faults of the circuit and the product to prevent potential safety hazards.

At present, the state has certain standard to the instrument industry fail safe detection, and each instrument company has different schemes to fail safe detection, and the final purpose of these schemes is exactly can in time detect the signal and can make instructions such as closing the valve, reporting to the police fast when the trouble problem appears. The current mainstream scheme has the circuit that the outside connects pull-up resistance, utilizes the level change of outside pull-up resistance department to detect whether have alarm signal etc. these schemes have and consume greatly, the circuit is complicated, be liable to be disturbed, easy spurious triggering, the reliability is not high and because the connector misconnection power leads to defects such as damage singlechip. Therefore, the alarm circuit based on misconnection prevention and strong anti-interference capability is designed, is applied to a low-power-consumption and low-cost intelligent instrument, solves the problems of high power consumption and complex circuit in similar application, and can avoid the problems of false triggering of alarm signals or false connection of power lines and the like due to interference in normal work.

Disclosure of Invention

Big, the circuit is complicated, easily receive the interference, easily mistake triggers, the reliability is not high and lead to damaging defects such as singlechip because the connector misconnection power, the utility model provides an alarm circuit based on two paster magnetic beads are used for improving interference killing feature and a diode is used for preventing misconnection.

The utility model provides an alarm circuit based on prevent misconnection and interference killing feature is strong includes singlechip U1, DC power supply VCC, diode D1, connector J1, first paster magnetic bead FB1, second paster magnetic bead FB2, crystal oscillator Y1, resistance R1, first filter capacitor C1, second filter capacitor C2, third filter capacitor C3, fourth filter capacitor C4, fifth filter capacitor C5.

One end of a resistor R1 is connected with the anode of a direct-current power supply VCC, the other end of a resistor R1 is connected with a first filter capacitor C1 and a pin 10 of a singlechip U1, and the other end of the first filter capacitor C1 is grounded; one end of a crystal oscillator Y1 is connected with a pin 11 of the singlechip U1 and one end of a second filter capacitor C2, the other end of the crystal oscillator Y1 is connected with a pin 12 of the singlechip U1 and one end of a third filter capacitor C3, and the other end of the second filter capacitor C2 and the other end of the third filter capacitor C3 are grounded; a pin 17 of the singlechip U1 is grounded; a pin 18 of the singlechip U1 is connected with the anode of a direct-current power supply VCC and one end of a fourth filter capacitor C4, and the other end of the fourth filter capacitor C4 is grounded; one end of a fifth filter capacitor C5 is connected with a pin 32 of the singlechip U1 and one end of a first patch magnetic bead FB1, and the other end of the fifth filter capacitor C5 is grounded; the other end of the first patch magnetic bead FB1 is connected with the anode of the diode D1, the cathode of the diode D1 is connected with the 1 pin of the connector J1, the 2 pin of the connector J1 is connected with one end of the second patch magnetic bead FB2, and the other end of the second patch magnetic bead FB2 is grounded.

The single chip microcomputer U1 adopts a chip with the model of R7F0C003M2 DFB. The model of the paster magnetic bead is FB035N 1500-300R. Connector J1 is of the type PH200_1 × 2R.

The invention has the following beneficial effects:

the circuit of the invention has simple design, is beneficial to the miniaturization of equipment and reduces the cost of raw materials; the double magnetic beads greatly improve the anti-interference capability of the alarm circuit, and the diode effectively prevents the problem that the single chip microcomputer is damaged due to the misconnection of the interface.

Drawings

FIG. 1 is a circuit diagram of the present invention;

FIG. 2 is a graph of the change in level after an alarm signal is received in the circuit of the present invention;

the specific implementation mode is as follows:

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

As shown in fig. 1 and 2, an alarm circuit based on misconnection prevention and strong interference rejection includes a single chip microcomputer U1, a dc power VCC, a diode D1, a connector J1, a first patch magnetic bead FB1, a second patch magnetic bead FB2, a crystal oscillator Y1, a resistor R1, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, a fourth filter capacitor C4, and a fifth filter capacitor C5.

The working process of the invention is as follows:

the power supply J1 provides a 3V-6V power supply, and the IO port of the singlechip U1 outputs high level by using an internal pull-up resistor. When the alarm is not triggered, the circuit is in an open circuit state, and the IO port of the single chip microcomputer U1 is continuously in a high level; when an alarm is triggered, the circuit is in a conducting state, the IO port of the single chip microcomputer U1 is changed into low level, the single chip microcomputer U1 confirms that the alarm signal is an alarm signal and gives instructions such as closing a valve in time if the low level is still obtained after scanning for multiple times, and the single chip microcomputer U1 considers that the false alarm is generated and does not process if the low level is not obtained after scanning for multiple times by the single chip microcomputer U1.

Under the condition of normal alarm, the diode D1 is conducted, and the single chip microcomputer U1 receives an alarm signal; when the socket is connected with the power source by mistake, the cathode of the diode D1 is connected with the anode of the power source, and the diode plays a role in blocking current, so that the circuit is opened, and the circuit and the single chip microcomputer U1 are protected.

Because the external connection wire of the alarm circuit is longer, the impedance is increased along with the lengthening of the wire length in the circuit, and the reliability is reduced, two magnetic beads are respectively connected in series on two wires close to the IC device, so that the anti-interference capability can be effectively improved, and the accuracy of detecting the alarm signal is improved.

Claims

1. An alarm circuit based on misconnection prevention and strong anti-jamming capability is characterized by comprising a single chip microcomputer U1, a direct-current power supply VCC, a diode D1, a connector J1, a first patch magnetic bead FB1, a second patch magnetic bead FB2, a crystal oscillator Y1, a resistor R1, a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, a fourth filter capacitor C4 and a fifth filter capacitor C5;

2. The alarm circuit based on the misconnection prevention and the strong interference resistance as claimed in claim 1, wherein the singlechip U1 adopts a chip with a model of R7F0C003M2 DFB; the model of the paster magnetic bead is FB035N 1500-300R; connector J1 is of the type PH200_1 × 2R.