CN104734116A - Electric leakage monitoring chip of electric leakage protector - Google Patents
Electric leakage monitoring chip of electric leakage protector Download PDFInfo
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- CN104734116A CN104734116A CN201310704774.8A CN201310704774A CN104734116A CN 104734116 A CN104734116 A CN 104734116A CN 201310704774 A CN201310704774 A CN 201310704774A CN 104734116 A CN104734116 A CN 104734116A
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Abstract
The invention relates to an electric leakage monitoring chip of an electric leakage protector. The electric leakage monitoring chip aims at solving the technical problem that electric leakage faults of a main loop and a ground wire cannot be simultaneously monitored in the prior art and comprises a voltage stabilizing circuit, an SCR drive circuit and two operational amplifier circuits, wherein the output end of the first operational amplifier circuit and the output end of the second operational amplifier circuit are electrically connected with the input end of the SCR drive circuit, and the positive input end of the first operational amplifier circuit is electrically connected with the positive input end of the second operational amplifier circuit and serves as a public input end to be connected with an external circuit. The negative input end of the first operational amplifier circuit and the negative input end of the second operational amplifier circuit are connected with external circuits. The voltage stabilizing circuit provides working voltage for the two operational amplifier circuits and the SCR drive circuit. The electric leakage monitoring chip utilizes two amplification input circuit structures, meanwhile monitors the electric leakage faults of the main loop and the ground wire, adopts few peripheral elements, is simple in structure and is suitable for large-batch production operation of a production line.
Description
Technical field
The present invention relates to a kind of earth leakage protective device, be specifically related to a kind of electric leakage monitoring chip of earth leakage protective device.
Background technology
Existing 4145 monitoring chips (IC) that leak electricity coordinated with earth leakage protective device only have a road input amplifying circuit, its leak current fault (i.e. the two poles of the earth break-make) being merely able to monitor major loop (zero N, fiery L line) and can not monitoring ground wire simultaneously.In order to realize the function of three pole break-makes, some employings increase the supervisory circuit of a controllable silicon Direct driver (without amplifying circuit), have plenty of and adopt input method in parallel to increase a supervisory circuit on existing single input chip circuit, what have then directly increases existing single input chip (i.e. two IC) supervisory circuit; All there is a lot of drawback in these measures, as when there is leak current fault in major loop and ground wire simultaneously, the actual value (i.e. the residual operating current sum of major loop and ground wire) that just there will be residual operating current far exceeds national standard, the safety of the serious threat person; A certain phase (L or the N) residual operating current that there will be major loop had far exceeds safety standard, then the serious energy imbalance that another phase (N or L) residual operating current is too small; Also have residual operating current to be not easy regulation and control, circuit structure is complicated, the shortcomings such as failure rate is high, and production difficulty is large.
Summary of the invention
The technical problem to be solved in the present invention is the leak current fault that prior art can not monitor major loop and ground wire simultaneously, once occur ground wire electrification fault, and can not the safety of the available protecting person.
For solving the problems of the technologies described above, the invention provides a kind of electric leakage monitoring chip of earth leakage protective device, include voltage stabilizing circuit, SCR drive circuit and two-way discharge circuit, the output of the first discharge circuit is electrically connected with the input of the output of the second discharge circuit and SCR drive circuit; The positive input terminal of the first discharge circuit is electrically connected with the positive input terminal of the second discharge circuit, as public input termination external circuit; The negative input termination external circuit of the first discharge circuit and the second discharge circuit; Voltage stabilizing circuit provides operating voltage for two-way discharge circuit and SCR drive circuit.
Described first discharge circuit comprises the first operation amplifier block, the first diode, the second diode, the first resistance and the second resistance; One end of wherein said second resistance is electrically connected with public input, the positive input of another termination first operation amplifier block; One end of described first resistance respectively with the negative pole of the first diode, the positive pole of the second diode connect public input after connecting, the other end respectively with the positive pole of the first diode, the negative pole of the second diode connect the negative input of the first operation amplifier block after connecting; The output of described first operation amplifier block connects the input of SCR drive circuit; Described voltage stabilizing circuit comprises the first voltage stabilizing didoe, the second voltage stabilizing didoe, the 3rd voltage stabilizing didoe and the 4th voltage stabilizing didoe; Power supply is connect in the negative pole of described first voltage stabilizing didoe to be 26V stabilized voltage power supply be two-way operation amplifier block and SCR drive circuit; The positive pole of the second voltage stabilizing didoe and the negative pole of the 3rd voltage stabilizing didoe are contacted as 13V reference voltage connects the public input of the first discharge circuit and the second discharge circuit; Described second discharge circuit comprises the second operation amplifier block, the 3rd diode, the 4th diode, the 3rd resistance and the 4th resistance; One end of wherein said 4th resistance is electrically connected with public input, the positive input of another termination second operation amplifier block; Described 3rd resistance one end respectively with the negative pole of the 3rd diode, the positive pole of the 4th diode connect 13V voltage stabilizing circuit end after connecting, the other end respectively with the positive pole of the 3rd diode, the negative pole of the 4th diode connect the negative input of the second operation amplifier block after connecting; The output of described second operation amplifier block is electrically connected with the output of the first operation amplifier block and the input of SCR drive circuit.
Described SCR drive circuit comprises the first drive block, the second drive block and the 5th load resistance; The output of the positive input termination two-way discharge circuit of the first drive block, negative input end is connected with the positive pole of the first voltage stabilizing didoe and the negative electricity of the second voltage stabilizing didoe; The output of the negative input termination two-way discharge circuit of described second drive block, positive input terminal is connected with the positive pole of the 3rd voltage stabilizing didoe and the negative electricity of the 4th voltage stabilizing didoe; The output of two drive circuits is electrically connected with the 5th load resistance.
The present invention's advantage is compared with prior art: utilize two to amplify input circuit structure, monitor the leak current fault (i.e. three pole break-makes) of major loop (zero N, fiery L line) and ground wire simultaneously.
As setting ground wire residual operating current I
Δ E=30 (25 ± 5) mA major loop residual operating current I
Δ L/Nduring=10 (7.5 ± 2) mA, total residual operating current I
Δ napproximate greatly ground wire leakage current I
Δ Ewith major loop leakage current I
Δ L/Ndifference namely: I
Δ n≈ I
Δ E-I
Δ L/N
When the residual operating current of setting ground wire and major loop is all less than 15mA, as 10 (7.5 ± 2) mA or 6 (5 ± 1) mA etc., then total residual operating current I
Δ napproximate greatly ground wire leakage current I
Δ Ewith major loop leakage current I
Δ L/Nsum is namely: I
Δ n≈ I
Δ E+ I
Δ L/N
When the residual operating current of setting ground wire and major loop is all greater than 15mA, during as 16 ~ 30mA, total residual operating current I
Δ n≈ I
Δ E≈ I
Δ L/N
Therefore this chip RT4145B circuit thoroughly avoids the potential safety hazard of the ubiquitous total residual operating current of existing three pole break-make earth leakage protective device (major loop+ground wire) much larger than 30mA, and two-way fault actions electric current can regulate and control arbitrarily respectively in GB safe range; Working stability is reliable, the more safety of the available protecting person; Can also common earth leakage protective device be used as and increase the functions such as overvoltage, mistakes (stream) year, overtemperature, remote control and timing according to user's request; And peripheral cell is few, structure is simple, and scheduling and planning is easy, is more suitable for production line balance operation in enormous quantities.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is the circuit theory diagrams of application state of the present invention.
Embodiment
As shown in Figure 1, a kind of electric leakage monitoring chip of earth leakage protective device, includes power supply stabilization circuit, SCR drive circuit and two-way discharge circuit, and the output of the first discharge circuit is electrically connected with the input of the output of the second discharge circuit and SCR drive circuit; The positive input terminal of the first discharge circuit is electrically connected with the positive input terminal of the second discharge circuit, as public input termination external circuit; The negative input termination external circuit of the first discharge circuit and the second discharge circuit; Power supply stabilization circuit provides operating voltage for two-way discharge circuit and SCR drive circuit.
Operation principle: as Fig. 2, shown in 3, voltage stabilizing circuit provides 26V operating voltage (connecting circuit omits and do not draw) for connecing in two-way discharge circuit and SCR driver output circuit, the input of simultaneously returning the first discharge circuit and the second discharge circuit provides 13V reference voltage, the input 1 of the first discharge circuit, the input 8 of 3 pin and the second discharge circuit, 3 pin connect instrument transformer ZCT1 and ZCT2 of induction electric leakage signal, if when the input of one of them (or two) discharge circuit receives the leak current fault signal of instrument transformer ZCT1 or ZCT2, higher than the negative fault-signal of reference voltage after the first discharge circuit or the second discharge circuit (or simultaneously two-way) amplify, be sent to SCR drive circuit, a powerful current signal is exported through 5 pin, the controllable silicon (SCR) connecting chip 5 pin is driven to coordinate the action tripping operations such as release JL, realize controlling major loop and earth connection (three pole) open circuit simultaneously, thus the function of protection personal safety, and utilize the feature of this chip dual input amplifying circuit, also can be used as common earth leakage protective device and increase the functions such as overvoltage, mistakes (stream) year, overtemperature, remote control and timing according to user's request.
As shown in Figure 2 and Figure 3, in the present embodiment, described first discharge circuit comprises the first operation amplifier block U1, the first diode D1, the second diode D2, the first resistance R1 and the second resistance R2; One end of wherein said second resistance R2 is electrically connected with 13V voltage stabilizing circuit and public input 3 pin, the positive input of another termination first operation amplifier block U1; Described first resistance R1 respectively with the negative pole of the first diode D1, the positive pole of the second diode D2 connect 13V voltage stabilizing circuit end after connecting, the other end respectively with the positive pole of the first diode D1, the negative pole of the second diode D2 connect negative input 1 pin of the first operation amplifier block U1 after connecting, and together meet signal source input circuit-instrument transformer ZCT1 with 3 pin; The output of described first operation amplifier block U1 connects input 2,7 pin of SCR drive circuit; Described second discharge circuit comprises the second operation amplifier block U2, the 3rd diode D3, the 4th diode D4, the 3rd resistance R3 and the 4th resistance R4; One end of wherein said 4th resistance R4 is electrically connected with 13V voltage stabilizing circuit and public input 3 pin, the positive input of another termination second operation amplifier block U2; Described 3rd resistance R3 respectively with the negative pole of the 3rd diode D3, the positive pole of the 4th diode D4 connect 13V voltage stabilizing circuit end after connecting, the other end respectively with the positive pole of the 3rd diode D3, the negative pole of the 4th diode D4 connect negative input 8 pin of the second operation amplifier block U2 after connecting, and together meet signal source input circuit-instrument transformer ZCT2 with 3 pin; The output of described second operation amplifier block U2 is electrically connected with input 2,7 pin of the output of the first operation amplifier block U1 and SCR drive circuit, regulates and controls resistance Rsense etc. be electrically connected with peripheral operating current sensitivity.
As shown in Figure 2,3, in the present embodiment, described SCR drive circuit comprises the first drive block U3 and the second drive block U4 and the 5th load resistance R5; The output of positive input termination two discharge circuit of the first drive block U3, negative input end is connected with the positive pole of the first voltage stabilizing didoe D5 and the negative electricity of the second voltage stabilizing didoe D6; The output of negative input termination two discharge circuit of described second drive block U4, positive input terminal is connected with the positive pole of the 3rd voltage stabilizing didoe D7 and the negative electricity of the 4th voltage stabilizing didoe D8; Output 5 pin of two drive blocks is electrically connected with the 5th load resistance R5, then the trigger electrode of external controllable silicon (SCR) Q.
As shown in Figure 2,3, in the present embodiment, described voltage stabilizing circuit comprises the first voltage stabilizing didoe D5, the second voltage stabilizing didoe D6, the 3rd voltage stabilizing didoe D7 and the 4th voltage stabilizing didoe D8; Power supply (connecting circuit omits and do not draw) is connect in the negative pole of described first voltage stabilizing didoe D5 to be 26V stabilized voltage power supply be two-way operation amplifier block and SCR drive circuit; The positive pole of the second voltage stabilizing didoe D6 and the negative pole of the 3rd voltage stabilizing didoe D7 are contacted as 13V reference voltage connects the first discharge circuit and the second discharge circuit public input 3 pin, stabilized voltage power supply 6 pin external power supply current-limiting resistance RLINE, 4 pin are that public lower margin connects power cathode.
Claims (3)
1. an electric leakage monitoring chip for earth leakage protective device, is characterized in that: include voltage stabilizing circuit, SCR drive circuit and two-way discharge circuit, and the output of the first discharge circuit is electrically connected with the input of the output of the second discharge circuit and SCR drive circuit; The positive input terminal of the first discharge circuit is electrically connected with the positive input terminal of the second discharge circuit, as public input termination external circuit; The negative input termination external circuit of the first discharge circuit and the second discharge circuit; Voltage stabilizing circuit provides operating voltage for two-way discharge circuit and SCR drive circuit.
2. the electric leakage monitoring chip of earth leakage protective device according to claim 1, is characterized in that: described first discharge circuit comprises the first operation amplifier block (U1), the first diode (D1), the second diode (D2), the first resistance (R1) and the second resistance (R2); One end of wherein said second resistance (R2) is electrically connected with public input, the positive input of another termination first operation amplifier block (U1); One end of described first resistance (R1) respectively with the negative pole of the first diode (D1), the positive pole of the second diode (D2) connect public input after connecting, the other end respectively with the positive pole of the first diode (D1), the negative pole of the second diode (D2) connect the negative input of the first operation amplifier block (U1) after connecting; The output of described first operation amplifier block (U1) connects the input of SCR drive circuit; Described voltage stabilizing circuit comprises the first voltage stabilizing didoe (D5), the second voltage stabilizing didoe (D6), the 3rd voltage stabilizing didoe (D7) and the 4th voltage stabilizing didoe (D8); Power supply is connect in the negative pole of described first voltage stabilizing didoe (D5) to be 26V stabilized voltage power supply be two-way operation amplifier block and SCR drive circuit; The positive pole of the second voltage stabilizing didoe (D6) and the negative pole of the 3rd voltage stabilizing didoe (D7) are contacted as 13V reference voltage connects the public input of the first discharge circuit and the second discharge circuit; Described second discharge circuit comprises the second operation amplifier block (U2), the 3rd diode (D3), the 4th diode (D4), the 3rd resistance (R3) and the 4th resistance (R4); One end of wherein said 4th resistance (R4) is electrically connected with public input, the positive input of another termination second operation amplifier block (U2); Described 3rd resistance (R3) one end respectively with the negative pole of the 3rd diode (D3), the positive pole of the 4th diode (D4) connect 13V voltage stabilizing circuit end after connecting, the other end respectively with the positive pole of the 3rd diode (D3), the negative pole of the 4th diode (D4) connect the negative input of the second operation amplifier block (U2) after connecting; The output of described second operation amplifier block (U2) is electrically connected with the output of the first operation amplifier block (U1) and the input of SCR drive circuit.
3. the electric leakage monitoring chip of earth leakage protective device according to claim 1 and 2, is characterized in that: described SCR drive circuit comprises the first drive block (U3), the second drive block (U4) and the 5th load resistance (R5); The output of the positive input termination two-way discharge circuit of the first drive block (U3), negative input end is connected with the positive pole of the first voltage stabilizing didoe (D5) and the negative electricity of the second voltage stabilizing didoe (D6); The output of the negative input termination two-way discharge circuit of described second drive block (U4), positive input terminal is connected with the positive pole of the 3rd voltage stabilizing didoe (D7) and the negative electricity of the 4th voltage stabilizing didoe (D8); The output of two drive circuits is electrically connected with the 5th load resistance (R5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310704774.8A CN104734116A (en) | 2013-12-20 | 2013-12-20 | Electric leakage monitoring chip of electric leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310704774.8A CN104734116A (en) | 2013-12-20 | 2013-12-20 | Electric leakage monitoring chip of electric leakage protector |
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| Publication Number | Publication Date |
|---|---|
| CN104734116A true CN104734116A (en) | 2015-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310704774.8A Pending CN104734116A (en) | 2013-12-20 | 2013-12-20 | Electric leakage monitoring chip of electric leakage protector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019015197A1 (en) * | 2017-07-18 | 2019-01-24 | 余姚市嘉荣电子电器有限公司 | Dual-input leakage protector circuit |
| CN110048369A (en) * | 2019-03-29 | 2019-07-23 | 余姚市嘉荣电子电器有限公司 | A kind of dual input earth leakage protective device chip |
Citations (4)
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|---|---|---|---|---|
| US20040037018A1 (en) * | 2002-08-23 | 2004-02-26 | Byung-Kook Kim | Apparatus and method for determining mis-wiring in a ground fault circuit interrupter |
| CN101174746A (en) * | 2006-11-03 | 2008-05-07 | 黄华道 | Creepage protecting socket with life end checking function |
| CN102723695A (en) * | 2012-07-06 | 2012-10-10 | 田子欣 | Leakage monitoring chip for leakage protector |
| CN203674686U (en) * | 2013-12-20 | 2014-06-25 | 田子欣 | Electric leakage monitoring chip of electric leakage protector |
-
2013
- 2013-12-20 CN CN201310704774.8A patent/CN104734116A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040037018A1 (en) * | 2002-08-23 | 2004-02-26 | Byung-Kook Kim | Apparatus and method for determining mis-wiring in a ground fault circuit interrupter |
| CN101174746A (en) * | 2006-11-03 | 2008-05-07 | 黄华道 | Creepage protecting socket with life end checking function |
| CN102723695A (en) * | 2012-07-06 | 2012-10-10 | 田子欣 | Leakage monitoring chip for leakage protector |
| CN203674686U (en) * | 2013-12-20 | 2014-06-25 | 田子欣 | Electric leakage monitoring chip of electric leakage protector |
Non-Patent Citations (1)
| Title |
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| TAOWEI198571: "GC4145专用漏电保护器", 《百度文库》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019015197A1 (en) * | 2017-07-18 | 2019-01-24 | 余姚市嘉荣电子电器有限公司 | Dual-input leakage protector circuit |
| CN110048369A (en) * | 2019-03-29 | 2019-07-23 | 余姚市嘉荣电子电器有限公司 | A kind of dual input earth leakage protective device chip |
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Application publication date: 20150624 |