CN102361317A - Leakage protection test circuit - Google Patents
Leakage protection test circuit Download PDFInfo
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- CN102361317A CN102361317A CN 201110235364 CN201110235364A CN102361317A CN 102361317 A CN102361317 A CN 102361317A CN 201110235364 CN201110235364 CN 201110235364 CN 201110235364 A CN201110235364 A CN 201110235364A CN 102361317 A CN102361317 A CN 102361317A
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- leakage current
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- current detection
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Abstract
The invention provides a leakage protection test circuit. The test circuit comprises a power circuit, a Hall leakage current detection circuit, a single-chip microprocessor (SCM) circuit, a relay drive circuit and an actuating mechanism, wherein, the power circuit is respectively connected with the Hall leakage current detection circuit, the SCM circuit and the relay drive circuit; an alternating current (AC) power supply is sequentially connected with the actuating mechanism and load via a primary side of the Hall leakage current detection circuit; an output terminal of the Hall leakage current detection circuit is connected with an I/O (input/output) port of the SCM circuit; and the I/O port of the SCM circuit is connected with the relay drive circuit; and the relay drive circuit is connected with the actuating mechanism. In the invention, the Hall leakage current sensor-the Hall leakage current detection circuit is a new generation of leakage current sensor based on magnetic modulation and zero magnetic flux principles, and has the characteristics of wide measurement range, high sensitivity and strong overload capacity; and leakage current is detected by the Hall leakage current sensor, a leakage current signal is processed by an SCM, and then the relay circuit and the actuating mechanism are sequentially driven to act so as to switch off a power supply, thus achieving the purpose of leakage protection.
Description
Technical field
The present invention relates to the technical field of leakage protection circuit, refer 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 objective of the invention is to overcome the deficiency of prior art, a kind of safer, more reliable earth leakage protective test circuit is provided.
For realizing above-mentioned purpose; Technical scheme provided by the present invention 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 present invention is after having adopted such scheme, and its great advantage is that Hall leakage current sensor of the present invention 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 present invention 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 a leakage protection circuit block diagram of the present invention.
Fig. 2 is a leakage protection circuit schematic diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment the present invention is described further.
According to attaching shown in Fig. 1 and 2; Preferred embodiment of the present invention 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, Hall leakage current detection circuit 2 of the present invention 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 have actuator 5 of the present invention to be contactor or relay.Operation principle of the present invention 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 only is the present invention's preferred embodiment, is not to limit practical range of the present invention with this, so the variation that all shapes according to the present invention, principle are done all should be encompassed in protection scope of the present invention.
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 |
|---|---|---|---|
| CN 201110235364 CN102361317B (en) | 2011-08-17 | 2011-08-17 | Leakage protection test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110235364 CN102361317B (en) | 2011-08-17 | 2011-08-17 | Leakage protection test circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102361317A true CN102361317A (en) | 2012-02-22 |
| CN102361317B CN102361317B (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110235364 Expired - Fee Related CN102361317B (en) | 2011-08-17 | 2011-08-17 | Leakage protection test circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN102361317B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104679078A (en) * | 2015-02-04 | 2015-06-03 | 成都市宏山科技有限公司 | Current test circuit with high reliability |
| CN107332206A (en) * | 2016-04-29 | 2017-11-07 | 竺红卫 | Earth detector based on many place potential changes |
| CN109917220A (en) * | 2019-03-27 | 2019-06-21 | 天长市龙亨电子有限公司 | A kind of electrical leakage detecting method for controller Hall element |
| CN114089073A (en) * | 2021-11-22 | 2022-02-25 | 江苏兴宙微电子有限公司 | Leakage detection device and leakage detection method |
| US11914000B2 (en) | 2021-03-05 | 2024-02-27 | Eaton Intelligent Power Limited | Leakage current detection in cable tray |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2528141Y (en) * | 2002-01-08 | 2002-12-25 | 章祖德 | Electronic controller for earth leakage protection |
| CN201181835Y (en) * | 2008-06-13 | 2009-01-14 | 章祖德 | Multifunctional earth-leakage protective equipment |
| JP2009225643A (en) * | 2008-03-19 | 2009-10-01 | Tempearl Ind Co Ltd | Leakage detector equipped with test device |
| CN201408980Y (en) * | 2009-04-28 | 2010-02-17 | 苏州工业园区新宏博通讯科技有限公司 | Single-phase intelligent power protection switch |
| CN202190052U (en) * | 2011-08-17 | 2012-04-11 | 佛山市中格威电子有限公司 | Testing circuit for leakage current protection |
-
2011
- 2011-08-17 CN CN 201110235364 patent/CN102361317B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2528141Y (en) * | 2002-01-08 | 2002-12-25 | 章祖德 | Electronic controller for earth leakage protection |
| JP2009225643A (en) * | 2008-03-19 | 2009-10-01 | Tempearl Ind Co Ltd | Leakage detector equipped with test device |
| CN201181835Y (en) * | 2008-06-13 | 2009-01-14 | 章祖德 | Multifunctional earth-leakage protective equipment |
| CN201408980Y (en) * | 2009-04-28 | 2010-02-17 | 苏州工业园区新宏博通讯科技有限公司 | Single-phase intelligent power protection switch |
| CN202190052U (en) * | 2011-08-17 | 2012-04-11 | 佛山市中格威电子有限公司 | Testing circuit for leakage current protection |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104679078A (en) * | 2015-02-04 | 2015-06-03 | 成都市宏山科技有限公司 | Current test circuit with high reliability |
| CN107332206A (en) * | 2016-04-29 | 2017-11-07 | 竺红卫 | Earth detector based on many place potential changes |
| CN109917220A (en) * | 2019-03-27 | 2019-06-21 | 天长市龙亨电子有限公司 | A kind of electrical leakage detecting method for controller Hall element |
| US11914000B2 (en) | 2021-03-05 | 2024-02-27 | Eaton Intelligent Power Limited | Leakage current detection in cable tray |
| CN114089073A (en) * | 2021-11-22 | 2022-02-25 | 江苏兴宙微电子有限公司 | Leakage detection device and leakage detection method |
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| Publication number | Publication date |
|---|---|
| CN102361317B (en) | 2013-01-23 |
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Granted publication date: 20130123 Termination date: 20210817 |
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| CF01 | Termination of patent right due to non-payment of annual fee |