CN203339658U - Electric leakage protection device - Google Patents
Electric leakage protection device Download PDFInfo
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- CN203339658U CN203339658U CN2013201858487U CN201320185848U CN203339658U CN 203339658 U CN203339658 U CN 203339658U CN 2013201858487 U CN2013201858487 U CN 2013201858487U CN 201320185848 U CN201320185848 U CN 201320185848U CN 203339658 U CN203339658 U CN 203339658U
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- resistance
- earth leakage
- circuit
- charge
- protective device
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Abstract
The utility model discloses an electric leakage protection device which comprises a relay, a rectifier bridge, a silicon controlled rectifier, a voltage-regulator tube, a mutual inductor, and a safety protection circuit. The safety protection circuit is a charge-discharge circuit with an adjustable constant of charge time. The input end of the safety protection circuit is connected with the mutual inductor, and the output end of the safety protection circuit is connected with the control electrode of the silicon controlled rectifier. When abnormal interference or electric leakage happens outside, the mutual inductor generates an induction signal, and the safety protection circuit is used for charging. When the voltage of the output end of the safety protection circuit reaches the voltage of the control electrode of the silicon controlled rectifier, the silicon controlled rectifier is on, so as to control the relay contact to disconnect for electric leakage protection. The electric leakage protection device sets the constant of charge time of the safety protection circuit according to an actual power utilization environment, avoids the impact of an interference signal and prevents misoperation from happening in the condition that the sensitivity of the electric leakage protection device is guaranteed, is simple in structure, and is strong in universality.
Description
Technical field
The utility model relates to electric leakage protection technology, relates in particular to a kind of earth leakage protective device.
Background technology
Earth leakage protective device is to cause a kind of earth protective device of accident for preventing that the person from getting an electric shock and leaking electricity.When circuit or power consumption equipment leakage current are greater than the setting value of device, or when people, animal generation Danger Electric shock risk, it can move rapidly, cuts off emergency power supply, avoids the expansion of accident, has ensured the safety of the person, equipment.Existing earth leakage protective device in use, easily is subject to external interference and misoperation occurs.For example; use earth leakage protective device the household electrical appliances side or near have other easily power supply to be produced to the equipment disturbed, when these device starts or while stopping, can producing strong interference signal; thereby cause earth leakage protective device to detect abnormal and misoperation occurs, affecting home appliance and normally use.
The utility model content
The technical problems to be solved in the utility model is to provide a kind of earth leakage protective device, to solve existing earth leakage protective device, easily is disturbed the problem that causes misoperation.
For achieving the above object, the utility model is achieved through the following technical solutions:
A kind of earth leakage protective device; described device comprises relay, rectifier bridge, controllable silicon, voltage-stabiliser tube and instrument transformer; it is characterized in that, described device also comprises safety protective circuit, and described relay one termination enters power line; the other end is connected with the input of rectifier bridge; the output of described rectifier bridge is connected with silicon controlled is anodal, described silicon controlled minus earth, and described silicon controlled is controlled the utmost point and is connected with the output of safety protective circuit; the input of safety protective circuit is connected with instrument transformer
Wherein, described safety protective circuit is the adjustable charge-discharge circuit of charge constant.
Further, described safety protective circuit comprises the charge-discharge circuit that resistance and electric capacity form, and resistance one end is connected with instrument transformer, and the resistance other end is connected with electric capacity, electric capacity other end ground connection, and resistance is controlled the utmost point with the common port of electric capacity with silicon controlled and is connected.
Further, described resistance comprises variable resistance.
Further, described resistance is the different resistance of a series of resistances that are connected in parallel, and each resistance is by supporting separately switch access or disconnection.
Further, the charge constant scope of described safety protective circuit is 500 microseconds～10 millisecond.
Further, the charge constant of described safety protective circuit is defaulted as 1 millisecond.
Further, described device is installed on all kinds of household electrical appliance, device interior, or is installed on power-line plug.
Further, described controllable silicon comprises one-way SCR.
Further, when abnormal interference or electric leakage appear in the external world, instrument transformer produces induced signal; by safety protective circuit, charge, when the safety protective circuit output end voltage reaches the SCR control pole tension, controlled silicon conducting; the control relay contact disconnects, and carries out earth leakage protective.
Earth leakage protective device described in the utility model; adopt the adjustable charge-discharge circuit of charge constant can realize electricity consumption purpose best under different power utilization environments; under the prerequisite that guarantees earth leakage protective device sensitivity, the interference effect of interference signal and the generation of misoperation have been avoided.
The accompanying drawing explanation
The structured flowchart that Fig. 1 is earth leakage protective device described in the utility model;
The circuit diagram of the earth leakage protective device that Fig. 2 provides for the utility model the first embodiment;
The circuit diagram of the earth leakage protective device that Fig. 3 provides for the utility model the second embodiment;
The effect schematic diagram that Fig. 4 is the utility model earth leakage protective device.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
The structured flowchart that Fig. 1 is earth leakage protective device described in the utility model.As shown in Figure 1, described earth leakage protective device comprises relay 101, rectifier bridge 102, controllable silicon 103, voltage-stabiliser tube 104, safety protective circuit 105 and instrument transformer 106, wherein, described relay 101 1 terminations enter power line, the other end is connected with the input of rectifier bridge 102, the output of described rectifier bridge 102 is connected with the positive pole of controllable silicon 103, the minus earth of described controllable silicon 103, the control utmost point of described controllable silicon 103 is connected with the output of safety protective circuit 105, the input of safety protective circuit 105 is connected with instrument transformer 106, described safety protective circuit 105 is the adjustable charge-discharge circuit of charge constant.
When abnormal interference or electric leakage appear in the external world, instrument transformer 106 produces induced signals, by safety protective circuit 105 chargings; when safety protective circuit 105 output end voltages reach controllable silicon 103 control pole tension; controllable silicon 103 conductings, control relay 101 contacts disconnect, and carry out earth leakage protective.
In the present embodiment, the charge constant of safety protective circuit is set according to actual power utilization environment, under the prerequisite that guarantees earth leakage protective device sensitivity, has avoided the impact of interference signal and the generation of misoperation.
The circuit diagram of the earth leakage protective device that Fig. 2 provides for the utility model the first embodiment.As described in Figure 2, relay K 1 one termination civil powers, the rectifier bridge that another termination is comprised of D1-D4.The positive pole of the output termination controllable silicon Q1 of rectifier bridge, the minus earth of controllable silicon Q1, the control utmost point of controllable silicon Q1 is connected with the output of safety protective circuit, be connected with voltage-stabiliser tube D6 between controllable silicon Q1 and ground, safety protective circuit comprises the adjustable charge-discharge circuit of charge constant be comprised of variable resistance R3 and capacitor C 1, the end of variable resistance R3 is connected with the output of mutual inductor, the other end of variable resistance R3 is connected with capacitor C 1, the other end ground connection of capacitor C 1, the common port of described variable resistance R3 and capacitor C 1 is as the output of safety protective circuit, with the control utmost point of controllable silicon Q1, be connected, R2 is load.Wherein, a plurality of contacts of relay K 1 are connected on (contact is connected with zero line L with live wire N, ground wire G respectively) in the civil power loop, suitably wire diameter and the coiling number of turn of selective relay coil, enough exciting power in the time of can guaranteeing its low-voltage.The moving contact of described relay is normally-closed contact.
Specific works principle: when the external world electric leakage occurs or extremely disturbs; the induction coil of instrument transformer induces the signal (interchange interference signal) of respective change; voltage waveform at coil two ends formation and modification; during by the RC charging circuit, C1 electric capacity is charged, when after resistance and the charging of electric capacity common port B point, voltage reaches the operation voltage of controllable silicon Q1; the Q1 conducting; thereby cause relay K 1 contact to disconnect, make whole circuit disconnect, reach the purpose of safeguard protection.
The voltage of mutual inductor coil induction is the interchange interference signal, by the RC charging circuit, C1 is charged, and when the positive half cycle of interchange interference signal passes through, to the C1 charging, when the negative half period of interchange interference signal passes through, C1 is discharged by load R2.Charge constant τ=R3*C1.Because capacitor C 1 is a definite value, therefore, charge constant is only relevant with variable resistance R3.When the R3 resistance is larger, the charging interval is longer; Otherwise the charging interval is shorter.
Here it should be noted that, the resistance of R3 directly affects the use of whole circuit, and when the R3 resistance is too small, once interference signal attacks, in the utmost point short time, the B point voltage just is charged to the operation voltage of Q1, thereby causes misoperation.When the R3 resistance is excessive, the B place is difficult to be charged to the operation voltage of Q1,, when normal electric leakage occurring, the problem of being failure to actuate also may occur, and brings potential safety hazard.Therefore the selection of R3 resistance is extremely important.In the present embodiment, the scope that timeconstantτ is chosen is 500 microseconds～10 millisecond, can set different charge constants for different power utilization environments, thereby mates different resistance values.
In the utility model, variable resistance R3 comprises potentiometer or slide rheostat etc., by regulating resistance with the coupling power utilization environment, thereby reaches the safest, the most reliable electricity consumption purpose.After variable resistance R3 and C1 coupling, charge constant meets the area requirement of 500 microseconds～10 milliseconds.Preferably, the charge constant default setting of safety protective circuit is on the resistance gear of 1 millisecond of correspondence.According to the gear characteristic of potentiometer, clearly after certain special angle of the every rotation of prompting operation person, the resistance lifting is how many, the time constant lifting is how many, thereby instructs concisely the operator to use.Those of ordinary skills easily know, regulate button by regulator potentiometer and can change resistance value, for the accurate resistance of prompting operation person's regulator potentiometer, on the potentiometer adjustment interface, the corresponding dial of angle and resistance is set, the operator only need to, according to the prompting rotation respective angles of dial, can accurately obtain increased resistance value, thereby obtain the changing value of charge constant.
Controllable silicon, be the abbreviation of silicon controlled rectifier, is a kind of large power semiconductor device with four-layer structure of three PN junctions, also is called thyristor.Having the characteristics such as volume is little, structure is relatively simple, function is strong, is one of semiconductor device of relatively commonly using.This device is widely used in, in various electronic equipments and electronic product, being used for controlled rectification, inversion, frequency conversion, pressure regulation, noncontacting switch etc. more.Controllable silicon is widely used in various household electrical appliance, equipment.The preferred one-way SCR of controllable silicon Q1 in the present embodiment.One-way SCR externally becomes conducting by shutoff under the control signal effect, once but conducting, external signal just can't make its shutoff, can only make its shutoff by removing load or reducing its both end voltage.
In the present embodiment, live wire N, ground wire G are connected with the contact of relay respectively with zero line L, when the relay normally-closed contact disconnects, guarantee that this whole circuit is in complete off-state, can effectively avoid ground wire in available circuit is under normally closed connection, the danger caused due to live wire, wiring reversal connection mistake.
The described earth leakage protective device of the present embodiment can be used for all kinds of household electrical appliance, device interior, also can be installed on power-line plug, can effectively avoid interference the misoperation that signal causes, and can assurance device the sensitivity of action.
The circuit diagram of the earth leakage protective device that Fig. 3 provides for the utility model the second embodiment.As described in Figure 3, relay K 1 one termination civil powers, the rectifier bridge that another termination is comprised of D1-D4.The positive pole of the output termination controllable silicon Q1 of rectifier bridge, the minus earth of controllable silicon Q1, the control utmost point of controllable silicon Q1 is connected with the output of safety protective circuit, be connected with voltage-stabiliser tube D6 between controllable silicon Q1 and ground, safety protective circuit comprises the adjustable charge-discharge circuit of charge constant that resistance that a series of resistances that are connected in parallel are different and capacitor C 1 form, each resistance is by supporting separately switch access or disconnection, common port one end of the resistance that a series of resistances that are connected in parallel are different is connected with the output of mutual inductor, the common port of the switch that each resistance is supporting is connected with capacitor C 1, the other end ground connection of capacitor C 1, the common port of the switch that the resistance that described a series of resistance be connected in parallel is different is supporting and the common port of capacitor C 1 are as the output of safety protective circuit, with the control utmost point of controllable silicon Q1, be connected, R2 is load.Wherein, the contact of relay K 1 is connected on (contact is connected with zero line L with live wire N, ground wire G respectively) in the civil power input circuit, suitably wire diameter and the coiling number of turn of selective relay coil, enough exciting power in the time of can guaranteeing its low-voltage.
Specific works principle: when the external world electric leakage occurs or extremely disturbs; the induction coil of instrument transformer induces the signal (interchange interference signal) of respective change; voltage waveform at coil two ends formation and modification; during by the RC charging circuit, C1 electric capacity is charged, when after a selected road resistance and the charging of electric capacity common port B point, voltage reaches the operation voltage of controllable silicon Q1; the Q1 conducting; thereby cause relay K 1 contact to disconnect, make whole circuit disconnect, reach the purpose of safeguard protection.
The present embodiment is from difference embodiment illustrated in fig. 2: the resistance that in the present embodiment, a series of resistances that are connected in parallel are different is by supporting switch controlling resistance access or disconnection separately, thus the charge constant of change safety protective circuit.The voltage of mutual inductor coil induction is the interchange interference signal, by the RC charging circuit, C1 is charged, and when the positive half cycle of interchange interference signal passes through, to the C1 charging, when the negative half period of interchange interference signal passes through, C1 is discharged by load R2.Charge constant τ=R3*C1.Because capacitor C 1 is a definite value, therefore, charge constant is only relevant with charging circuit access resistance.When the access resistance is larger, the charging interval is longer; Otherwise the charging interval is shorter.
In theory, the resistance that described in the present embodiment, a series of resistances that are connected in parallel are different can be contained the resistance of all needs.Resistance for non-standard resistance can obtain by the mode of a plurality of resistance combinations.Supporting switch by selected resistance accesses this resistance value with the coupling power utilization environment, thereby reaches the safest, the most reliable electricity consumption purpose.After the resistance that described a series of resistance be connected in parallel is different and C1 coupling, charge constant meets the area requirement of 500 microseconds～10 milliseconds.Preferably, the charge constant default setting of safety protective circuit is on the resistance gear of 1 millisecond of correspondence.According to the different resistance of a series of resistances that are connected in parallel, can accurately access needed resistance by supporting separately switch, thereby determine charge constant accurately.
The described earth leakage protective device of the present embodiment; compared to the described embodiment of Fig. 2 some complexity slightly; but can be accurately, the charge constant of rapid adjustment safety protective circuit, to mate current specific power utilization environment, the misoperation that can effectively avoid external interference or electric leakage to cause.
The effect schematic diagram that Fig. 4 is the utility model earth leakage protective device.In each figure, curve 1 means the interchange interference signal that mutual inductor coil is sensed, and curve 2 means the silicon controlled actuating signal.To be respectively 1K and 2K carry out comparative illustration as example to the adjustable resistor resistance of take in safety protective circuit.It is in the 1K situation that Fig. 4 (a) shows adjustable resistor R3, induction coil produces the situation that interference signal is charged to C1 by the RC charge-discharge circuit that exchanges, because resistance R 3 resistances are less, charge constant is little, exchanging interference signal charges to C1, the common port of adjustable resistor R3 and capacitor C 1 reaches the operation voltage of controllable silicon Q1 at short notice, thereby causes misoperation.
It is in the 2K situation that Fig. 4 (b) shows adjustable resistor R3, and induction coil produces and exchanges interference signal, the situation by the RC charge-discharge circuit to capacitor C 1 charging.Adjustable resistor R3 resistance is increased to 2K by original 1K, and the charging current of same interference signal being passed through to 3 pairs of capacitor C 1 of resistance R reduces one times, and charging reaches controllable silicon Q1 action required time and lengthens.At the positive half cycle that exchanges interference signal, to capacitor C 1 charging, but the electric weight filled is little during with respect to 1K resistance, is not enough to drive controllable silicon Q1 action; During negative half period, the polarity conversion, capacitor C 1 electric discharge, the institute's charge volume on electric capacity is little to be discharged very soon, in next cycle, if any interference signal, repeats this process; Or interference signal is while disappearing, filled electricity electric discharge naturally in loop on the capacitor C 1 of part electric weight, finally the institute's charge volume on capacitor C 1 does not reach the action request of controllable silicon Q1, thus relay K 1 not misoperation.
As shown in Figure 4; the charge constant of safety protective circuit is set according to actual power utilization environment; under the prerequisite that guarantees earth leakage protective device sensitivity, avoided the impact of interference signal and the generation of misoperation, can realize electricity consumption purpose best under different power utilization environments.
In sum, for common user group, the rare electric equipment that can cause larger interference in its house, in the very good situation of power utilization environment, earth leakage protective device described in the utility model is difficult to be interfered and causes misoperation, the constant that charges in such cases also arranges smallerly, thereby can tell rapidly interference signal and electric leakage signal, rapidly electric leakage signal is carried out to estimation & disposing; For special user group; as large-sized workshop, industrial and mineral place etc.; easily circuit is caused to large harm in the main equipment shutdown process under this kind of environment; cause extremely strong interference signal; in the situation that this power utilization environment is most evil bad; need to avoid Lou protecting the problem of circuit erroneous action; therefore the charging constant need to arrange well-to-doly; thereby avoid misoperation; but also can clearly judge interference signal and electric leakage signal simultaneously; when the interference signal timer that attacks, be failure to actuate, when electric leakage occurs, device action carries out safeguard protection.
Above are only preferred embodiment of the present utility model and institute's application technology principle; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement, all should be encompassed in protection range of the present utility model.
Claims (7)
1. an earth leakage protective device; described device comprises relay, rectifier bridge, controllable silicon, voltage-stabiliser tube and instrument transformer; it is characterized in that, described device also comprises safety protective circuit, and described relay one termination enters power line; the other end is connected with the input of rectifier bridge; the output of described rectifier bridge is connected with silicon controlled is anodal, described silicon controlled minus earth, and described silicon controlled is controlled the utmost point and is connected with the output of safety protective circuit; the input of safety protective circuit is connected with instrument transformer
Wherein, described safety protective circuit is the adjustable charge-discharge circuit of charge constant.
2. earth leakage protective device according to claim 1; it is characterized in that; described safety protective circuit comprises the charge-discharge circuit that resistance and electric capacity form; resistance one end is connected with instrument transformer; the resistance other end is connected with electric capacity; electric capacity other end ground connection, resistance is controlled the utmost point with the common port of electric capacity with silicon controlled and is connected.
3. earth leakage protective device according to claim 2, is characterized in that, described resistance comprises variable resistance.
4. earth leakage protective device according to claim 2, is characterized in that, described resistance is the different resistance of a series of resistances that are connected in parallel, and each resistance is by supporting separately switch access or disconnection.
5. according to the described earth leakage protective device of one of claim 1 to 4, it is characterized in that, the charge constant scope of described safety protective circuit is 500 microseconds～10 millisecond.
6. earth leakage protective device according to claim 5, is characterized in that, the charge constant of described safety protective circuit is defaulted as 1 millisecond.
7. earth leakage protective device according to claim 1, is characterized in that, described controllable silicon comprises one-way SCR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201858487U CN203339658U (en) | 2013-04-12 | 2013-04-12 | Electric leakage protection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201858487U CN203339658U (en) | 2013-04-12 | 2013-04-12 | Electric leakage protection device |
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| CN203339658U true CN203339658U (en) | 2013-12-11 |
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| CN2013201858487U Expired - Lifetime CN203339658U (en) | 2013-04-12 | 2013-04-12 | Electric leakage protection device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377647A (en) * | 2014-11-27 | 2015-02-25 | 德力西电气有限公司 | Electric leakage protection circuit |
| CN105098698A (en) * | 2015-09-23 | 2015-11-25 | 杭州华杭电子电器有限公司 | Voltage-type earth leakage protector |
| CN106607974A (en) * | 2017-01-21 | 2017-05-03 | 向奕铭 | Safety protection device for electric circular saw and method thereof |
| CN108318740A (en) * | 2018-03-01 | 2018-07-24 | 昆明创培知识产权服务有限公司 | A kind of device measuring load electric leakage or aging using piezoelectrics |
| CN112415351A (en) * | 2020-11-04 | 2021-02-26 | 四川光慧新能源科技有限公司 | Insulation monitoring method for completing connection of charging pile on line |
-
2013
- 2013-04-12 CN CN2013201858487U patent/CN203339658U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104377647A (en) * | 2014-11-27 | 2015-02-25 | 德力西电气有限公司 | Electric leakage protection circuit |
| CN104377647B (en) * | 2014-11-27 | 2018-02-27 | 德力西电气有限公司 | leakage protection circuit |
| CN105098698A (en) * | 2015-09-23 | 2015-11-25 | 杭州华杭电子电器有限公司 | Voltage-type earth leakage protector |
| CN105098698B (en) * | 2015-09-23 | 2018-06-19 | 杭州华杭电子电器有限公司 | A kind of voltage-type earth leakage protector |
| CN106607974A (en) * | 2017-01-21 | 2017-05-03 | 向奕铭 | Safety protection device for electric circular saw and method thereof |
| CN108318740A (en) * | 2018-03-01 | 2018-07-24 | 昆明创培知识产权服务有限公司 | A kind of device measuring load electric leakage or aging using piezoelectrics |
| CN112415351A (en) * | 2020-11-04 | 2021-02-26 | 四川光慧新能源科技有限公司 | Insulation monitoring method for completing connection of charging pile on line |
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| GR01 | Patent grant | ||
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Effective date of registration: 20160525 Address after: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Patentee after: QINGDAO HAIER DRUM WASHING MACHINE Co.,Ltd. Address before: 266101 Haier Industrial Park, No. 1, Haier Road, hi tech park, Laoshan District, Shandong, China Patentee before: HAIER Group Corp. Patentee before: QINGDAO HAIER DRUM WASHING MACHINE Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131211 |