CN105572521A - Ground wire live-line detection display circuit and electric device - Google Patents
Ground wire live-line detection display circuit and electric device Download PDFInfo
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- CN105572521A CN105572521A CN201410528969.6A CN201410528969A CN105572521A CN 105572521 A CN105572521 A CN 105572521A CN 201410528969 A CN201410528969 A CN 201410528969A CN 105572521 A CN105572521 A CN 105572521A
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- ground wire
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- compression limiter
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Abstract
The invention provides a ground wire live-line detection display device comprising a display unit used for transmitting indication signals; and a voltage limiting unit. The voltage limiting unit and the display unit are serially connected between the ground wire and the neutral wire in a coupled manner, when the voltage limiting unit can be connected by adopting the voltage difference between the ground wire and the neutral wire, the predetermined voltage drop can be generated by the voltage limiting unit. The display unit can be used to determine whether the indication signals can be transmitted based on the voltage difference between the ground wire and the neutral wire and the predetermined voltage drop generated by the voltage limiting unit. By adopting the technical scheme, the circuit having advantages of long service lifetime, high reliability, and ability of indicating the ground wire connection error or the live-line ground wire can be provided, and by adopting the circuit, the safe insulation voltage between the neutral wire and the ground wire can be guaranteed.
Description
Technical field
The invention belongs to domestic circuit field, particularly relate to a kind of ground wire electrified detection display circuit and consumer.
Background technology
Along with popularizing of electricity consumption, Electrical Safety is also more and more paid attention to, and particularly easily causes Danger Electric shock risk or property loss when electric equipment products live wire (L), zero line (N), ground wire (PE) wiring error or ground wire electrification.
Existing product also prevents the function such as wiring error or ground wire electrification display, and Fig. 1 is the schematic diagram in prior art with ground wire electrification Presentation Function circuit.In the circuit, electrical appliance R
land zero line, to be connected by K switch between live wire, the housing G of electrical appliance is also connected by K switch with ground wire simultaneously.Ground wire electrification display circuit is made up of the resistance R1 connected between zero line with ground wire and neon bulb XD.But there is obvious shortcoming in this technical scheme, namely when the length of circuit exceedes the reason of certain value or electrical appliance self, will cause ground wire or zero line produce certain induced electricity, at this moment neon bulb XD will be bright, that is lighting of neon bulb XD does not control by voltage swing, and such as, under the 36V voltage of safety, neon bulb XD also can light, such can mislead users can not be correct judge, bring to user and obscure.
Fig. 2 is the another kind of schematic diagram with ground wire electrification Presentation Function circuit in prior art.In this circuit, ground wire electrification display circuit is made up of the resistance R1 connected between zero line and ground wire, diode D1, LED, but still there is above defect in this circuit, zero line and ground wire insulation voltage safety can not be guaranteed simultaneously, if when the power-frequency voltage of 1500V applies to get on, diode D1 and/or LED will be caused breakdown.
Therefore, the ground wire electrified detection display circuit that a kind of low cost, reliability are high, the life-span is long is needed.
Summary of the invention
For above problem, the invention provides a kind of long service life, can presettingly make lamp light voltage, and the circuit of display live wire, zero line, ground wire wiring error or ground wire electrification.This circuit can guarantee insulation voltage safety between zero line and ground wire.
One aspect of the present invention proposes a kind of ground wire electrified detection display device, comprising: display unit, for sending indicator signal; Compression limiter, itself and described display unit coupled in series are between ground wire and zero line, if the voltage difference between ground wire and zero line can make described compression limiter conducting, then described compression limiter produces predetermined pressure drop; The described predetermined pressure drop that described display unit at least produces based on the voltage difference between ground wire and zero line and described compression limiter determines whether sending indicator signal.
By technique scheme, display unit can be made under predetermined voltage conditions, just can to send ground wire electrification or electrical wire wiring error indication signal, avoid the maloperation of user.
Preferably, described device also comprises: high-impedance cell, and itself and described display unit, compression limiter coupled in series, between ground wire and zero line, bear corresponding voltage for during its conducting.
Preferably, described device also comprises: negative peak protected location, for when producing inverse peak voltage, limits the voltage on described display unit; Wherein, described negative peak protected location and described display unit are connected in parallel; Or the series circuit that forms of described display unit and compression limiter and described negative peak protected location are connected in parallel.
Preferably, described display unit comprises at least one light emitting diode or neon bulb.
Preferably, described high-impedance cell comprises: comprise the series circuit of multiple resistance and/or comprise the series circuit of multiple resistance capacitance, and/or the series circuit comprising active device etc.
Preferably, described compression limiter comprises at least one bidirectional trigger diode.
Preferably, described negative peak protected location comprises at least one negative peak diode.
The invention also discloses a kind of consumer comprising ground wire electrified detection display device as above described in any one, comprising: fire-wire interfaces, zero line interface and interface of the ground wire; Wherein, when described live wire and ground wire connect anti-or live wire and zero line connects inverse time, described display unit sends indicator signal.
Preferably, when the voltage on the housing of described consumer exceedes predeterminated voltage, described display unit sends indicator signal.
By adopting technical scheme of the present invention, display unit can be made under predetermined voltage conditions, just can to send ground wire electrification or electrical wire wiring error indication signal, avoid the maloperation of user, and have that the life-span is long, reliability is high can guarantee insulation voltage safety between zero line and ground wire.
Accompanying drawing explanation
After description by reference to the specific embodiment of the present invention given by following accompanying drawing, the present invention will be understood better, and other objects of the present invention, details, feature and advantage will become more apparent.In the accompanying drawings:
Fig. 1 is the schematic diagram in prior art with ground wire electrification Presentation Function circuit;
Fig. 2 is the another kind of schematic diagram with ground wire electrification Presentation Function circuit in prior art;
Fig. 3 is the circuit module schematic diagram according to the embodiment of the present invention;
Fig. 4 is the first the improvement circuit diagram according to the embodiment of the present invention;
Fig. 5 is the second improvement circuit diagram according to the embodiment of the present invention;
Fig. 6 is the third improvement circuit diagram according to the embodiment of the present invention.
Embodiment
Below with reference to accompanying drawings preferred implementation of the present disclosure is described in more detail.Although show preferred implementation of the present disclosure in accompanying drawing, but should be appreciated that, the disclosure can be realized in a variety of manners and not should limit by the embodiment of setting forth here.On the contrary, provide these embodiments to be to make the disclosure more thorough and complete, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
In conjunction with diagram, embodiments of the invention are set forth.
Fig. 3 is the circuit module schematic diagram according to the embodiment of the present invention.
Compared to the circuit in Fig. 1, the detection display circuit 30 be connected between zero line and ground wire in Fig. 3 comprises display unit DS and compression limiter PV.Display unit DS is used for sending indicator signal.Compression limiter PV and display unit DS coupled in series are between ground wire and zero line, if the voltage difference between ground wire and zero line can make compression limiter PV conducting, then compression limiter PV produces predetermined pressure drop.
Therefore, by reconciling the pressure drop on compression limiter PV, the voltage on display unit DS can be mediated, thus when making the voltage difference of display unit DS between ground wire and zero line be more than or equal to a threshold value, can indicator signal be sent.
Take safe voltage as 36V be example, be configured the forward voltage of compression limiter PV, thus make to be set to when making neon bulb XD be greater than 36V, neon bulb XD could be bright, while guaranteeing Electrical Safety, the judgement that also will user be made to do because of the safe voltage of below 36V to make mistake and obscuring.
Fig. 4 is the first the improvement circuit diagram according to the embodiment of the present invention.
In the circuit, display unit DS comprises resistance R1, the neon bulb XD of series connection, and compression limiter PV comprises at least one bidirectional trigger diode D2.D2 can need default trigger voltage according to user, to guarantee that LED lights under the voltage status of regulation.Be understandable that, when adopting bidirectional trigger diode D2, as long as the voltage difference between zero line and ground wire reaches certain value, just can puncture bidirectional trigger diode D2, thus lighting neon bulb XD.
Because bidirectional trigger diode D2 and neon bulb all can at forward and reverse operating at voltages, therefore, the circuit in Fig. 4 can work in the positive and negative half cycle of alternating current, thus simplifies circuit and improve the reliability of circuit.
As the second improvement circuit diagram that Fig. 5 is according to the embodiment of the present invention.
Electric capacity C1 is further comprises compared to the circuit in Fig. 4, Fig. 5.The detection display circuit be connected between zero line and ground wire comprises: electric capacity C1, resistance R1, LED, negative peak diode D1, bidirectional trigger diode D2.Wherein, bidirectional trigger diode D2, can need predeterminated voltage according to user, guarantees that LED is luminous under the voltage status of regulation, such as, usually used as the 36V of safe voltage.Be set to by the magnitude of voltage of bidirectional trigger diode D2 when making LED be greater than 36V, LED could be bright, while guaranteeing Electrical Safety, user also can not be made to make the judgement of mistake and obscure because of the safe voltage of below 36V.
In addition, by the RC high-impedance cell adopting electric capacity C1 and resistance R1 to be composed in series, its internal resistance based on self bears corresponding voltage when compression limiter conducting, can guarantee insulation voltage safety between zero line and ground wire, this is because RC series circuit has very large internal resistance.Obviously, high-impedance cell is not only confined to RC series circuit, as long as the element of any type of connected mode, any type can meet needs of the present invention, all can as high-impedance cell, for example comprise the higher resistance series circuit of multiple resistance or comprise the series circuit of multiple resistance capacitance, or comprise series circuit of active device (such as, transistor) etc.
Based on this detection display circuit, as load consumer R
loperating voltage when being 120V or 220V, ground wire is connected with consumer housing G.Now, if live wire and ground wire connect instead, so LED will be lit, and prompting user is dangerous; In like manner, if live wire and zero line connect instead, so LED also will be lit, and same prompting user is dangerous; If consumer R
lhousing chargedly exceeded predeterminated voltage 36V, LED also will be lit, and same prompting user is dangerous.On the contrary, if because the long inevasible generation of distance circuit is less than the safe inductive voltage of 36V, LED can not be bright, namely can not mislead users.
This circuit can also comprise negative peak protected location, for when producing inverse peak voltage, and the voltage on restriction display unit.Optionally, negative peak protected location and display unit are connected in parallel; Or the series circuit that forms of display unit and compression limiter and negative peak protected location are connected in parallel.
In the present embodiment, negative peak protected location is negative peak diode D1, and it is for clamping down on the voltage at LED two ends when producing inverse peak voltage, to avoid causing damage to LED.And LED can be luminous interchange half cycle time, D1 is reverse-biased for negative peak diode, does not clamp down on the voltage at LED two ends, now with LED dividing potential drop be high-impedance cell and bidirectional trigger diode D2.
Be understandable that, bidirectional trigger diode D2 can be arranged on different positions as required.Fig. 6 is the third improvement circuit diagram according to the embodiment of the present invention.
Be in parallel compared to the series circuit of the LED in Fig. 5, Fig. 6 and bidirectional trigger diode D2 and negative peak diode D1, therefore, LED and bidirectional trigger diode D2 can avoid receiving high inverse peak voltage, thus improves the reliability of circuit.When LED is in the interchange half cycle of its work, bidirectional trigger diode D2 conducting, D1 is reverse-biased for negative peak diode; When LED is in another half cycle, zero line and ground wire are directly connected by negative peak diode D1 and R1, C1, now then do not require that D2 must conducting.
The invention also discloses a kind of consumer with ground wire electrified detection display device, it comprises fire-wire interfaces, zero line interface and interface of the ground wire; When described live wire and ground wire connect anti-or live wire and zero line connects inverse time, described display unit sends indicator signal.
Preferably, when the voltage on the housing of this consumer exceedes predeterminated voltage, display unit DS sends indicator signal.
Those skilled in the art, it is understood that above-mentioned state is only for example, are not intended to limit range of application of the present invention.Those of ordinary skill in the art it is also understood that various exemplary logical block, unit, circuit and algorithm steps that the embodiment in conjunction with the application describes can be embodied as electronic hardware, computer software or the combination of the two.In order to clearly represent this interchangeability between hardware and software, all around its function, general description is carried out to various exemplary parts, block, unit, circuit and step above.Be embodied as hardware as this function or be embodied as software, the design constraint depending on specific application and apply over the whole system.Those skilled in the art for often kind of application-specific, can realize described function in the mode of accommodation, but, thisly realize decision-making and should not be construed as and deviate from protection scope of the present invention.
Claims (9)
1. a ground wire electrified detection display device, is characterized in that, comprising:
Display unit, for sending indicator signal;
Compression limiter, itself and described display unit coupled in series are between ground wire and zero line, if the voltage difference between ground wire and zero line can make described compression limiter conducting, then described compression limiter produces predetermined pressure drop;
The described predetermined pressure drop that described display unit at least produces based on the voltage difference between ground wire and zero line and described compression limiter determines whether sending indicator signal.
2. device as claimed in claim 1, is characterized in that, also comprise:
High-impedance cell, itself and described display unit, compression limiter coupled in series, between ground wire and zero line, bear corresponding voltage for during its conducting.
3. device as claimed in claim 2, is characterized in that, also comprise:
Negative peak protected location, for when producing inverse peak voltage, limits the voltage on described display unit;
Wherein, described negative peak protected location and described display unit are connected in parallel; Or
The series circuit that described display unit and compression limiter are formed and described negative peak protected location are connected in parallel.
4. device as claimed in claim 1, it is characterized in that, described display unit comprises at least one light emitting diode or neon bulb.
5. device as claimed in claim 2, it is characterized in that, described high-impedance cell comprises:
Comprise the series circuit of multiple resistance and/or comprise the series circuit of multiple resistance capacitance, and/or the series circuit comprising active device etc.
6. device as claimed in claim 1, it is characterized in that, described compression limiter comprises at least one bidirectional trigger diode.
7. device as claimed in claim 3, it is characterized in that, described negative peak protected location comprises at least one negative peak diode.
8. comprise a consumer for the ground wire electrified detection display device as described in any one of claim 1 to 7, it is characterized in that, comprising:
Fire-wire interfaces, zero line interface and interface of the ground wire;
Wherein, when described live wire and ground wire connect anti-or live wire and zero line connects inverse time, described display unit sends indicator signal.
9. consumer as claimed in claim 8, is characterized in that,
Wherein, when the voltage on the housing of described consumer exceedes predeterminated voltage, described display unit sends indicator signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528969.6A CN105572521A (en) | 2014-10-09 | 2014-10-09 | Ground wire live-line detection display circuit and electric device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528969.6A CN105572521A (en) | 2014-10-09 | 2014-10-09 | Ground wire live-line detection display circuit and electric device |
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| Publication Number | Publication Date |
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| CN105572521A true CN105572521A (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410528969.6A Pending CN105572521A (en) | 2014-10-09 | 2014-10-09 | Ground wire live-line detection display circuit and electric device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147538A (en) * | 2020-09-27 | 2020-12-29 | 中国长城科技集团股份有限公司 | Equipment poor grounding alarm circuit, poor grounding alarm device and switch device |
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| CN2599593Y (en) * | 2003-01-21 | 2004-01-14 | 高春林 | AC domestic electricity-proof center |
| CN102338838A (en) * | 2010-07-26 | 2012-02-01 | 英业达股份有限公司 | Creepage detection circuit |
| CN102798789A (en) * | 2012-03-03 | 2012-11-28 | 深圳市南岛机电有限公司 | Abnormal fault flashing alarm indicating device of grounding system |
| CN204241605U (en) * | 2014-10-09 | 2015-04-01 | 苏州益而益电器制造有限公司 | Ground wire electrified detection display device and consumer |
-
2014
- 2014-10-09 CN CN201410528969.6A patent/CN105572521A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2599593Y (en) * | 2003-01-21 | 2004-01-14 | 高春林 | AC domestic electricity-proof center |
| CN102338838A (en) * | 2010-07-26 | 2012-02-01 | 英业达股份有限公司 | Creepage detection circuit |
| CN102798789A (en) * | 2012-03-03 | 2012-11-28 | 深圳市南岛机电有限公司 | Abnormal fault flashing alarm indicating device of grounding system |
| CN204241605U (en) * | 2014-10-09 | 2015-04-01 | 苏州益而益电器制造有限公司 | Ground wire electrified detection display device and consumer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112147538A (en) * | 2020-09-27 | 2020-12-29 | 中国长城科技集团股份有限公司 | Equipment poor grounding alarm circuit, poor grounding alarm device and switch device |
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Application publication date: 20160511 |
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