CN112098892A

CN112098892A - Electricity leakage alarm circuit for electricity utilization equipment

Info

Publication number: CN112098892A
Application number: CN202010988181.9A
Authority: CN
Inventors: 尹磊方
Original assignee: Xinxing Ductile Iron Pipes Co Ltd
Current assignee: Xinxing Ductile Iron Pipes Co Ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2020-12-18

Abstract

The invention discloses an electric leakage alarm circuit of electric equipment, which comprises a trigger chip, a buzzer, a current-limiting resistor and a reset button, wherein the reset button is connected between a power supply and the trigger chip to complete the reset of the trigger; the current limiting resistor and the light emitting diode play a role in indicating a power supply, and the buzzer is connected with an output pin of the integrated trigger chip and used for alarming and prompting; this circuit utilizes the input high impedance characteristic of trigger chip, and the voltage that responds to input pin triggers output high level drive buzzer warning, and this circuit design is simple, and is applicable to narrow work area's consumer leakage detection with low costs.

Description

Electricity leakage alarm circuit for electricity utilization equipment

Technical Field

The invention relates to the field of weak current detection, in particular to a leakage alarm circuit of power utilization equipment.

Background

Safety power consumption needs check out test set whether electric leakage, for example switch, metal casing live equipment, although conventional check out test set is intelligent digital display detection in the market, in some adverse circumstances such as industrial power consumption equipment, or some unconventional operating occasion such as narrow areas such as pipeline, often these check out test set are difficult to be competent and with high costs, and conventional electric leakage check out test set internal circuit adopts the weak current amplification signal that traditional amplifier circuit detected to it, and this measure interference killing feature is poor, sensitivity is low.

Disclosure of Invention

The invention provides an electric leakage alarm circuit for electric equipment, which solves the problem of electric leakage detection of electric facilities.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the utility model provides a consumer electric leakage alarm circuit, includes power supply, reset button, resistance and integrated trigger, current-limiting resistance R1 is connected to the power supply positive terminal, current-limiting resistance R1 other end draws forth the wire and connects reset button, the reset button other end is drawn forth the wire and is connected current-limiting resistance R2, stabilivolt negative pole and integrated trigger's pin respectively, the current-limiting resistance R2 other end is drawn forth the wire and is connected the emitting diode positive pole, the emitting diode negative pole is drawn forth the wire and is linked to each other with power supply's negative pole, stabilivolt positive pole and integrated trigger's pin and buzzer's negative pole, integrated trigger's pin is drawn forth the wire and is connected current-limiting resistance R3, the buzzer positive pole is connected to the current-limiting resistance R3 other end.

The technical scheme of the invention is further improved as follows: the integrated trigger adopts a multi-trigger integrated chip of 74HC74 model.

The technical scheme of the invention is further improved as follows: the resistance value of the current limiting resistor R1 is 50-150.

The technical scheme of the invention is further improved as follows: the resistance range of the current limiting resistor R2 is 200-500, and the resistance range of the current limiting resistor R3 is 150-400.

The technical scheme of the invention is further improved as follows: the model of the voltage-stabilizing tube adopts one of 1N4728 and IN 5226.

The technical scheme of the invention is further improved as follows: the voltage of the power supply (1) is 5V.

Due to the adoption of the technical scheme, the invention has the technical progress that:

the leakage alarm circuit is simple to operate, and is convenient to modify and access to electric equipment, and the used materials are conventional electronic devices; the detection circuit intercepts voltage fluctuation by utilizing the high impedance characteristic of the IC chip, triggers the high level of the pin at the output end of the IC chip, is extremely sensitive to weak current detection, and has obvious effect on the harsh industrial power utilization area of the use environment.

Drawings

FIG. 1 is a circuit diagram of an electric leakage alarm circuit of an electric equipment of the present invention;

FIG. 2 is a pin diagram of a 74HC74 multi-flip-flop IC chip;

the device comprises a power supply 1, a power supply 2, a reset button 3, current-limiting resistors R1 and 4, current-limiting resistors R2 and 5, a light-emitting diode 6, a voltage regulator tube 7, an integrated trigger 8, current-limiting resistors R3 and 9 and a buzzer.

Detailed Description

A power consumption equipment leakage alarm circuit comprises a power supply 1 with 5V voltage, a reset button 2, a resistor and an integrated trigger 7, wherein the positive end of the power supply 1 is connected with a current-limiting resistor R1 with the resistance value of 50-150, the other end of the current-limiting resistor R1 is led out to form a lead to be connected with the reset button 2, the other end of the reset button is led out to form a lead to be connected with a current-limiting resistor R2 with the resistance value of 200-500, the negative electrode of a voltage-stabilizing

tube

6 and 14 pins of the integrated trigger 7, the other end of the current-limiting resistor R2 is led out to form a lead to be connected with the positive electrode of a light-emitting diode 5, the negative electrode of the light-emitting diode 5 is led out to form a lead to be connected with the negative. A lead wire led out from a pin 5 of the integrated trigger 7 is connected with a current-limiting resistor R3 with the resistance value of 150-400, the other end of the current-limiting resistor R3 is connected with the anode of a buzzer 9, and the cathode of the buzzer 9 is connected with the cathode of the power supply 1; the voltage regulator tube 6 may be any one of 1N4728 and IN 5226.

When the device works, a handheld circuit board is adopted, a lead is led out from the integrated trigger pin 3, and the other end of the lead is contacted with an electric appliance or the surface of an object to be detected; because the integrated trigger adopts 74HC74 with high impedance characteristic, voltage fluctuation received by the lead can form trigger voltage to trigger the output pin 5 of 74HC74 to output high level, and the buzzer is driven to sound at the moment, so that electric leakage can be known; the light-emitting diode is used for displaying whether the power supply is normal or not, if the detection is finished and the next detection is carried out, the reset button 2 is pressed to carry out potential reset, and the three current-limiting resistors are divided into a protection voltage-stabilizing tube, the light-emitting diode and the buzzer to be free from overcurrent damage.

Claims

1. An electric leakage alarm circuit of electric equipment comprises a power supply (1), a reset button (2), a resistor and an integrated trigger (7), wherein the positive end of the power supply (1) is connected with a current-limiting resistor R1 (3), the other end of the current-limiting resistor R1 (3) is led out by a lead to be connected with the reset button (2), the other end of the reset button is led out by a lead to be respectively connected with a current-limiting resistor R2 (4), the cathode of a voltage-stabilizing tube (6) and a 14 pin of the integrated trigger (7), the other end of the current-limiting resistor R2 (4) is led out by a lead to be connected with the anode of a light-emitting diode (5), the cathode of the light-emitting diode (5), the anode of the voltage-stabilizing tube (6) and the pin 7 of the integrated trigger (7) are respectively led out by leads to be connected with the cathode of the power supply (1), and the pin, and a lead is led out from the other end of the current-limiting resistor R3(8) and is connected with the anode of a buzzer (9), and the cathode of the buzzer (9) is connected with the cathode of the power supply (1).

2. The electric leakage alarm circuit of electric equipment according to claim 1, wherein: the integrated trigger (7) adopts a multi-trigger integrated chip of 74HC74 model.

3. The electric leakage alarm circuit of electric equipment according to claim 1, wherein: and the resistance value of the current limiting resistor R1 (3) is 50-150.

4. The electric leakage alarm circuit of electric equipment according to claim 1, wherein: the resistance range of the current limiting resistor R2 (4) is 200-500, and the resistance range of the current limiting resistor R3(8) is 150-400.

5. The electric leakage alarm circuit of electric equipment according to claim 1, wherein: the model of the voltage-stabilizing tube adopts one of 1N4728 and IN 5226.

6. An electric leakage alarm circuit for electric equipment according to any one of claims 1 to 5, wherein: the voltage of the power supply (1) is 5V.