CN202840472U - Leakage protector - Google Patents
Leakage protector Download PDFInfo
- Publication number
- CN202840472U CN202840472U CN 201220426549 CN201220426549U CN202840472U CN 202840472 U CN202840472 U CN 202840472U CN 201220426549 CN201220426549 CN 201220426549 CN 201220426549 U CN201220426549 U CN 201220426549U CN 202840472 U CN202840472 U CN 202840472U
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- Prior art keywords
- triode
- circuit
- earth leakage
- leakage protective
- protective device
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- 230000001012 protector Effects 0.000 title 1
- 230000001681 protective effect Effects 0.000 claims description 31
- 238000012360 testing method Methods 0.000 claims description 29
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000007257 malfunction Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 10
- 238000001914 filtration Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004021 metal welding Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model provides a leakage protection device, including power supply circuit, detection circuitry and execution circuit, wherein, detection circuitry receives the power that power supply circuit provided, it has amplifier circuit, and amplifier circuit has the triode, and the signal of current transformer output is received to the base of triode, and is connected with first zener diode between the base of triode and the projecting pole, and execution circuit has the thyristor, and the signal of triode output is received to the thyristor, and the positive pole of thyristor is connected to an input of release, negative pole ground connection. The utility model provides a leakage protection device low in production cost, and effectively avoid the emergence of malfunction.
Description
Technical field
The utility model relates to the earth leakage protective field, especially relates to a kind of earth leakage protective device.
Background technology
In daily life or producing, the electric accident that causes because of reasons such as the improper use of electric equipment or wiring line electrical leakages happens occasionally, and the electric leakage of low-voltage distributing line, the electric leakage of power consumption equipment, overload and short circuit or earth current flow through the metal welding seam heating all may cause fire.Therefore, existing house fitting-up all can arrange the earth leakage protective device of low pressure, for detection of the electric leakage situation of power consumption equipment and circuit, and action when electric leakage occurs, cut off the power supply to power consumption equipment, to guarantee Electrical Safety.
Owing to existing earth leakage protective device mainly designs for shower set; these earth leakage protective devices arrange the integrated chip of high pressure; after current transformer detects the electric current letter; with current signal transfer to integrated chip; by integrated chip the signal of telecommunication is analyzed, and driven the release action by integrated chip.Existing earth leakage protective device is very responsive to the electric current leakage current, and in a single day integrated chip deviation occurs to the analyzing and processing of current signal, namely can cause the misoperation of release.If this earth leakage protective device is installed on other the power consumption equipment, be easy to occur misoperation, cause the power consumption equipment cisco unity malfunction, make troubles to the user.
In addition, because existing earth leakage protective device need to arrange the integrated chip of high pressure, its production cost is higher, causes the cost performance of earth leakage protective device lower.
Summary of the invention
It is lower and avoid the earth leakage protective device of misoperation that main purpose of the present utility model provides a kind of production cost.
For realizing main purpose of the present utility model; the earth leakage protective device that the utility model provides comprises power circuit; testing circuit and executive circuit; wherein; testing circuit receives the power supply that described power circuit provides; it has amplifying circuit; amplifying circuit has triode; the signal of the base stage received current instrument transformer output of triode; and be connected with the first voltage stabilizing didoe between the base stage of triode and the emitter; executive circuit has thyristor; thyristor receives the signal of triode output, and the anodic bonding of thyristor is to an input of release, minus earth.
By such scheme as seen, the current transformer of testing circuit is sent to the base stage of triode with the current signal that detects, and triode exports thyristor to after current signal is amplified, and thyristor is to the release output signal.Like this, when electric leakage not occuring, the amplitude of current signal is less, the triode cut-off, and thyristor also ends, and release is failure to actuate.In case leak electricity, the current signal amplitude is larger, the triode conducting, and thyristor is immediately conducting also, the release action.And between the base stage of triode and emitter, be connected voltage stabilizing didoe, avoid triode to be operated in the saturation region, guarantee that triode amplifies current signal.
As seen, can immediately detect the change of current signal amplitude by earth leakage protective device, and move by triode, thyristor driver release rapidly, thereby realize rapidly earth leakage protective, earth leakage protective device is active in one's movements.Because earth leakage protective device do not arrange integrated chip, production cost is lower, and avoid owing to integrated chip to the misoperation that dealing with improperly of signal causes, be conducive to user's use.
A preferred scheme is to be connected with the second voltage stabilizing didoe between the control end of thyristor and the ground.Like this, the forward voltage of avoiding thyristor is too high and affect the work of thyristor, guarantees the action accuracy of earth leakage protective device.
Further scheme is, the signal of the collector electrode output of triode exports the testing circuit output to through diode, and be connected with the first coupling capacitance between the collector electrode of triode and the anode of diode, the negative electrode of diode is connected to the output of testing circuit.
This shows, the electric current of transistor collector output outputs to thyristor through diode and coupling capacitance, avoid electric current oppositely to flow to the collector electrode of triode, simultaneously coupling capacitance can be isolated the DC component in the signal of telecommunication of transistor collector output effectively, thereby avoids the release misoperation.
Description of drawings
Fig. 1 is the electrical schematic diagram of the utility model embodiment.
Fig. 2 is the electrical schematic diagram of power circuit among the utility model embodiment.
Fig. 3 is the electrical schematic diagram of testing circuit among the utility model embodiment.
Fig. 4 is the electrical schematic diagram of executive circuit among the utility model embodiment.
The utility model is described in further detail below in conjunction with drawings and Examples.
Embodiment
Referring to Fig. 1, present embodiment has power circuit 11, testing circuit 12 and executive circuit 13, power circuit 11 is used for providing low-voltage DC with civil power through over commutation, the backward testing circuit 12 of voltage stabilizing, testing circuit 12 is used for the electric current of power consumption equipment is detected, and the current signal that detects processed, to executive circuit 13 output signals.Executive circuit 13 is realized the earth leakage protective to power consumption equipment according to the signal driver release action that receives.
Referring to Fig. 2, power circuit 11 has piezo-resistance Z1, filter capacitor C1, C4, and is provided with resistance R 1, R3 and voltage stabilizing didoe D1, and bridge rectifier BG1, capacitor C 3 are set simultaneously, and the capacitor C 3 that wherein is connected in parallel, resistance R 3 consist of discharge loop.
Behind the civil power process piezo-resistance Z1, carry out filtering by filter capacitor C1, interference signal in the filtered electrical signal, and after the dividing potential drop through divider resistance R1, be input among the bridge rectifier BG1, convert direct current signal to, and by after the voltage stabilizing didoe D1 voltage stabilizing, carry out filtering through filter capacitor C4, export 12 volts DC power supply, to testing circuit 12 power supplies.
Referring to Fig. 3, testing circuit 12 has current transformer X2, for detection of the current signal of power consumption equipment, and exports the current signal that detects to filter capacitor C5 and carries out filtering.Filtered current signal is input to the base stage b1 of triode Q1 through behind the coupling capacitance C6 and resistance R 6 that are connected in series.As seen, be connected with coupling capacitance C6 between the base stage b1 of current transformer X2 and triode Q1.Like this, the DC component in the filtered signal of telecommunication is coupled the isolation of capacitor C 6, is input to triode Q1 base stage b1 through the current signal after straight.
Emitter e 1 ground connection of triode Q1, collector electrode c1 is connected to DC power supply by pull-up resistor R2, i.e. 12 volts of DC power supply providing of power circuit 11.Between base stage b1 and emitter e 1, be connected with voltage stabilizing didoe D6, avoid due to leakage current excessive and cause the electric current of base stage b1 excessive, and then avoid triode Q1 because of the excessive saturation region that is operated in of the electric current of base stage b1, guarantee that triode Q1 is operated in the amplification region, output after current signal is amplified.
Between the output of the collector electrode c1 of triode Q1 and testing circuit 12, be connected with coupling capacitance C2 and the diode D2 that is connected in series, coupling capacitance C2 is connected between the anode of collector electrode c1 and diode D2, and the negative electrode of diode D2 is connected to the output of testing circuit 12.Coupling capacitance C2 is used for the current signal of the collector electrode c1 output of triode Q1 is carried out every straight processing, and with the isolation of the DC component in the current signal, diode D2 reversely flows into the collector electrode c1 of triode Q1 for the electric current of avoiding testing circuit 12 outputs.
Between the collector electrode c1 of triode Q1 and ground, be connected with capacitor C 7, be connected with resistance R 8 between the anode of diode D2 and the ground, between the output of testing circuit 12 and ground, be connected with filter capacitor C8, resistance R 9 and the voltage stabilizing didoe D7 that is connected in parallel.Filter capacitor C8 carries out filtering to the signal of testing circuit 12 outputs, and voltage stabilizing didoe D7 guarantees that the voltage signal of testing circuit 12 outputs is stable.
In the present embodiment, triode Q1, resistance R 2, R6, R7 and R8 form amplifying circuit, are used for the current signal that current transformer X2 detects is amplified.
Referring to Fig. 4, executive circuit 13 has thyristor BT1 and release D5, and the anodic bonding of thyristor BT1 is to the input of release D5, minus earth, the signal of telecommunication of control end receiving test circuit 12 outputs.During testing circuit 12 output high level signal, thyristor BT1 conducting, release D5 receives the signal of telecommunication and the action of threading off, and avoids the power consumption equipment leakage current excessive.
Be connected with power indicating circuit between two outputs of release D5, power indicating circuit is made of the light-emitting diode D4 that is connected in series and resistance R 5, light-emitting diode D4 is sound and light alarm device, and when release D5 moved, light-emitting diode D4 was luminous to send alarm signal.Certainly, during practical application, can also use buzzer as sound and light alarm device, buzzer can use simultaneously with light-emitting diode or use separately.
In addition, also be connected with test loop between two signal terminals of release D5, it comprises two calibrating terminal X01, X02 and switching device SW.During test, with two calibrating terminal X01, X02 short circuit, and press switching device SW, signal terminal will receive the short circuit signal like this, can test whether correct operation of release D5.
After earth leakage protective device was installed on the power consumption equipment, current transformer X2 detected the current signal of power consumption equipment, and exported the signal that detects to triode Q1.Less at current signal, when the electric leakage situation does not namely occur, triode Q1 cut-off, thyristor BT1 does not end because control end receives Continuity signal, and release D5 is failure to actuate.In case the electric leakage situation occurs, the current signal that current transformer X2 detects is excessive, triode Q1 conducting, current signal exports thyristor BT1 to after triode Q1 amplifies, thyristor BT1 conducting, to the input output signal of release D5, release D5 carries out the action of threading off.Simultaneously, the light-emitting diode D4 in the power indicating circuit is luminous, sends alarm signal to the user.
By above-mentioned scheme as seen; earth leakage protective device need not to arrange integrated chip, only uses cheap triode Q1 as amplifying device, and sends signal with cut-off to release D5 by the conducting of control thyristor BT1; the action of control release D5, production cost is lower.And because earth leakage protective device does not need by integrated chip current signal to be processed, the work of triode Q1 and thyristor BT1 is accurate, can avoid the earth leakage protective device misoperation.
Certainly, above-described embodiment only be the utility model preferred embodiment, during practical application more change can also be arranged, for example, in testing circuit, suitably increase perhaps voltage stabilizing didoe of filtered electrical, the signal that outputs to executive circuit is carried out filtering and voltage stabilizing; Perhaps, more capacitance is set, the DC component in the signal of telecommunication is effectively isolated, these changes can't affect enforcement of the present utility model.
It is emphasized that at last the utility model is not limited to above-mentioned execution mode, also should be included in the protection range of the utility model claim such as the change of current transformer type, the variations such as change of sound and light alarm device.
Claims (9)
1. earth leakage protective device comprises
Power circuit;
It is characterized in that:
Testing circuit, receive the power supply that described power circuit provides, described testing circuit has amplifying circuit, and described amplifying circuit has triode, the signal of the base stage received current instrument transformer output of described triode, and be connected with the first voltage stabilizing didoe between the base stage of described triode and the emitter;
Executive circuit has thyristor, and described thyristor receives the signal of described triode output, and the anodic bonding of described thyristor is to an input of release, the minus earth of described thyristor.
2. earth leakage protective device according to claim 1 is characterized in that:
Be connected with the second voltage stabilizing didoe between the control end of described thyristor and the ground.
3. earth leakage protective device according to claim 1 and 2 is characterized in that:
The signal of the collector electrode output of described triode exports described testing circuit output to through diode.
4. earth leakage protective device according to claim 3 is characterized in that:
Be connected with the first coupling capacitance between the collector electrode of described triode and the anode of described diode, the negative electrode of described diode is connected to the output of described testing circuit.
5. earth leakage protective device according to claim 1 and 2 is characterized in that:
Be connected with the second coupling capacitance between the output of described current transformer and the base stage of described triode.
6. earth leakage protective device according to claim 1 and 2 is characterized in that:
Be connected with power indicating circuit between two signal output parts of described release.
7. earth leakage protective device according to claim 6 is characterized in that:
Described power indicating circuit has sound and light alarm device.
8. earth leakage protective device according to claim 7 is characterized in that:
Described sound and light alarm device comprises light-emitting diode or buzzer at least.
9. earth leakage protective device according to claim 1 and 2 is characterized in that:
Be provided with test loop between two signal terminals of described release, described test loop has a switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426549 CN202840472U (en) | 2012-08-24 | 2012-08-24 | Leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220426549 CN202840472U (en) | 2012-08-24 | 2012-08-24 | Leakage protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202840472U true CN202840472U (en) | 2013-03-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220426549 Expired - Fee Related CN202840472U (en) | 2012-08-24 | 2012-08-24 | Leakage protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202840472U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616606A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | JP cabinet electric leakage alarm apparatus |
| CN104577976A (en) * | 2013-10-24 | 2015-04-29 | 珠海格力电器股份有限公司 | Arc fault protection device and control method thereof |
-
2012
- 2012-08-24 CN CN 201220426549 patent/CN202840472U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577976A (en) * | 2013-10-24 | 2015-04-29 | 珠海格力电器股份有限公司 | Arc fault protection device and control method thereof |
| CN104577976B (en) * | 2013-10-24 | 2017-08-08 | 珠海格力电器股份有限公司 | Arc fault protection device and control method thereof |
| CN103616606A (en) * | 2013-11-29 | 2014-03-05 | 国家电网公司 | JP cabinet electric leakage alarm apparatus |
| CN103616606B (en) * | 2013-11-29 | 2016-06-08 | 国家电网公司 | Jp cabinet leakage alarm |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20210824 |