CN202190052U - Testing circuit for leakage current protection - Google Patents
Testing circuit for leakage current protection Download PDFInfo
- Publication number
- CN202190052U CN202190052U CN2011202985300U CN201120298530U CN202190052U CN 202190052 U CN202190052 U CN 202190052U CN 2011202985300 U CN2011202985300 U CN 2011202985300U CN 201120298530 U CN201120298530 U CN 201120298530U CN 202190052 U CN202190052 U CN 202190052U
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- circuit
- leakage current
- hall
- current detection
- single chip
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Abstract
The utility model provides a testing circuit for leakage current protection, which comprises a power circuit, a Hall leakage current detection circuit, a single chip microcomputer circuit, a relay driving circuit and an actuating mechanism, wherein the power circuit is in circuit connection with the Hall leakage current detection circuit, the single chip microcomputer circuit and the relay driving circuit respectively; an alternating current power supply passes through a primary side of the Hall leakage current detection circuit, and then is connected with the actuating mechanism and a load; the output end of the Hall leakage current detection circuit is connected with an I/O port of the single chip microcomputer, and the I/O port of the single chip microcomputer is connected with the relay driving circuit; and the relay driving circuit is connected with the actuating mechanism. A Hall leakage current sensor provided by the utility model is a new generation of leakage current sensor applying the magnetic modulating and zero magnetic flow principles, and has the advantages of wide measuring range, high sensitivity and high overload capacity; and the testing circuit adopts a Hall current sensor to detect the leakage current which is processed by a single chip microcomputer so as to drive the relay circuit and drive the actuating mechanism to act, thus cutting off the power supply and achieving the protection purpose.
Description
Technical field
The utility model relates to the technical field of leakage protection circuit, refers in particular to a kind of earth leakage protective test circuit.
Background technology
Traditional leakage protection circuit all is to adopt earth leakage circuit-breaker to realize earth leakage protective, this protected mode, and sensitivity is not very high, industry is stipulated earth leakage protective operating current＜30mA usually, in general, still safe.But to specific crowd, as suffer from patient, old man or the child of certain disease, then safe current will be had a greatly reduced quality, maybe several milliamperes will threat to life.
Summary of the invention
The purpose of the utility model is to overcome the deficiency of prior art, and a kind of safer, more reliable earth leakage protective test circuit is provided.
For realizing above-mentioned purpose; The technical scheme that the utility model provided is: a kind of earth leakage protective test circuit; It includes power circuit, Hall leakage current detection circuit, single chip circuit, relay drive circuit, actuator, and wherein, power circuit is connected with Hall leakage current detection circuit, single chip circuit, relay drive circuit respectively; Meet actuator behind the primary side of AC power through the Hall leakage current detection circuit and connect load again; The I/O mouth of the output order sheet machine circuit of Hall leakage current detection circuit, the I/O mouth of single chip circuit is succeeded electrical apparatus driving circuit, and relay drive circuit is connected with actuator.
Described Hall leakage current detection circuit is Hall leakage current sensor U1, and its signal output part OP pin connects the positive pole of electrochemical capacitor E1 and an end of resistance R 1, the other end ground connection of resistance R 1; It is anodal that electrochemical capacitor E1 negative pole meets diode D1; The negative pole of diode D1 connects the I/O mouth of electrochemical capacitor E2 positive pole, diode D2 positive pole, ceramic disc capacitor C1 one end and single-chip microcomputer U2; Negative pole connects electrochemical capacitor E2 negative pole and ceramic disc capacitor C1 other end ground connection, and diode D2 negative pole connects+the 5V power supply.
Described actuator is contactor or relay.
The utility model is after having adopted such scheme; Its great advantage is that the Hall leakage current sensor of the utility model is a leakage current sensor of new generation of using magnetic modulation and zero magnetic flux principle, has that measuring range is wide, a high sensitivity, characteristics that overload capacity is strong; When primary side passed through several milliamperes electric current, its output promptly had signal output.Therefore, the utility model adopts Hall current sensor to detect leakage current, handles the rear drive relay circuit through single-chip microcomputer, and the driving execution mechanism action is cut off the electricity supply again, reaches the purpose of protection.
Description of drawings
Fig. 1 is the leakage protection circuit block diagram of the utility model.
Fig. 2 is the leakage protection circuit schematic diagram of the utility model.
Embodiment
Below in conjunction with specific embodiment the utility model is described further.
According to attaching shown in Fig. 1 and 2; The preferred embodiment of the utility model includes power circuit 1, Hall leakage current detection circuit 2, single chip circuit 3, relay drive circuit 4, actuator 5; Wherein, Power circuit 1 is connected with Hall leakage current detection circuit 2, single chip circuit 3, relay drive circuit 4 respectively, meets actuator 5 behind the primary side of AC power through Hall leakage current detection circuit 2 and connects load again, the I/O mouth of the output order sheet machine circuit 3 of Hall leakage current detection circuit 2; The I/O mouth of single chip circuit 3 is succeeded electrical apparatus driving circuit 4, and relay drive circuit 4 is connected with actuator 5.In addition, the described Hall leakage current detection circuit 2 of the utility model is Hall leakage current sensor U1, and its signal output part OP pin connects the positive pole of electrochemical capacitor E1 and an end of resistance R 1, the other end ground connection of resistance R 1; It is anodal that electrochemical capacitor E1 negative pole meets diode D1; The negative pole of diode D1 connects the I/O mouth of electrochemical capacitor E2 positive pole, diode D2 positive pole, ceramic disc capacitor C1 one end and single-chip microcomputer U2; Negative pole connects electrochemical capacitor E2 negative pole and ceramic disc capacitor C1 other end ground connection, and diode D2 negative pole connects+the 5V power supply.Also having the described actuator 5 of the utility model is contactor or relay.The operation principle of the utility model is: the SW1 that pushes button, and relay J 2A adhesive, J2C, the J2D closing of contact, the live wire L of 220V power supply and zero line N from elementary the passing of Hall leakage current sensor U1, and then connect load behind relay J 2 contacts.When the load circuit leakage current produces, the flux vector of Hall leakage current sensor U1 induction and be zero, then its signal output part OP no current output, at this moment, the input of single-chip processor i/o mouth no-voltage signal, not adhesive of relay J 1A; When load end has electric leakage, its L, N line current imbalance, at this moment, Hall leakage current sensor U1 has electric current output; Resistance R 1 produces a voltage signal, through capacitive coupling, delivers to the I/O mouth of single-chip microcomputer behind the diode rectification, after single chip circuit 3 is handled; Drive relay J 1 adhesive, contact J1B breaks off, and relay J 2A discharges; Contact J2C, J2D break off, and cut off the electricity supply, and play a protective role.
The embodiment of the above is the preferred embodiment of the utility model only, is not the practical range that limits the utility model with this, so the variation that all shapes according to the utility model, principle are done all should be encompassed in the protection range of the utility model.
Claims (3)
1. earth leakage protective test circuit; It is characterized in that: it includes power circuit (1), Hall leakage current detection circuit (2), single chip circuit (3), relay drive circuit (4), actuator (5); Wherein, Power circuit (1) is connected with Hall leakage current detection circuit (2), single chip circuit (3), relay drive circuit (4) respectively; Meet actuator (5) behind the primary side of AC power through Hall leakage current detection circuit (2) and connect load again; The I/O mouth of the output order sheet machine circuit (3) of Hall leakage current detection circuit (2), the I/O mouth of single chip circuit (3) is succeeded electrical apparatus driving circuit (4), and relay drive circuit (4) is connected with actuator (5).
2. a kind of earth leakage protective test circuit according to claim 1; It is characterized in that: described Hall leakage current detection circuit (2) is Hall leakage current sensor U1; Its signal output part OP pin connects the positive pole of electrochemical capacitor E1 and an end of resistance R 1, the other end ground connection of resistance R 1; It is anodal that electrochemical capacitor E1 negative pole meets diode D1; The negative pole of diode D1 connects the I/O mouth of electrochemical capacitor E2 positive pole, diode D2 positive pole, ceramic disc capacitor C1 one end and single-chip microcomputer U2; Negative pole connects electrochemical capacitor E2 negative pole and ceramic disc capacitor C1 other end ground connection, and diode D2 negative pole connects+the 5V power supply.
3. a kind of earth leakage protective test circuit according to claim 1 is characterized in that: described actuator (5) is contactor or relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202985300U CN202190052U (en) | 2011-08-17 | 2011-08-17 | Testing circuit for leakage current protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202985300U CN202190052U (en) | 2011-08-17 | 2011-08-17 | Testing circuit for leakage current protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202190052U true CN202190052U (en) | 2012-04-11 |
Family
ID=45921486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202985300U Withdrawn - After Issue CN202190052U (en) | 2011-08-17 | 2011-08-17 | Testing circuit for leakage current protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202190052U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361317A (en) * | 2011-08-17 | 2012-02-22 | 佛山市中格威电子有限公司 | Leakage protection test circuit |
| CN103983886A (en) * | 2014-05-08 | 2014-08-13 | 国家电网公司 | Electric leakage detection system applied to rural power distribution network field |
| CN104090199A (en) * | 2014-07-07 | 2014-10-08 | 珠海格力电器股份有限公司 | Device for simulating poor power contact phenomenon in use process of electric appliance |
| CN105548757A (en) * | 2015-12-15 | 2016-05-04 | 东北电力大学 | Tester for leakage protector |
| CN107819319A (en) * | 2016-09-14 | 2018-03-20 | 西门子公司 | For gathering and disconnecting the device of fault current |
-
2011
- 2011-08-17 CN CN2011202985300U patent/CN202190052U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361317A (en) * | 2011-08-17 | 2012-02-22 | 佛山市中格威电子有限公司 | Leakage protection test circuit |
| CN103983886A (en) * | 2014-05-08 | 2014-08-13 | 国家电网公司 | Electric leakage detection system applied to rural power distribution network field |
| CN104090199A (en) * | 2014-07-07 | 2014-10-08 | 珠海格力电器股份有限公司 | Device for simulating poor power contact phenomenon in use process of electric appliance |
| CN104090199B (en) * | 2014-07-07 | 2017-01-18 | 珠海格力电器股份有限公司 | Device for simulating poor power contact phenomenon in use process of electric appliance |
| CN105548757A (en) * | 2015-12-15 | 2016-05-04 | 东北电力大学 | Tester for leakage protector |
| CN107819319A (en) * | 2016-09-14 | 2018-03-20 | 西门子公司 | For gathering and disconnecting the device of fault current |
| CN107819319B (en) * | 2016-09-14 | 2020-06-12 | 西门子公司 | Device for detecting and interrupting fault currents |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120411 Effective date of abandoning: 20130306 |
|
| RGAV | Abandon patent right to avoid regrant |