CN202917948U - Protective device for electrical wiring - Google Patents

Protective device for electrical wiring Download PDF

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Publication number
CN202917948U
CN202917948U CN 201220601053 CN201220601053U CN202917948U CN 202917948 U CN202917948 U CN 202917948U CN 201220601053 CN201220601053 CN 201220601053 CN 201220601053 U CN201220601053 U CN 201220601053U CN 202917948 U CN202917948 U CN 202917948U
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China
Prior art keywords
signal
residual current
conductor
current detection
zero line
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Expired - Lifetime
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CN 201220601053
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Chinese (zh)
Inventor
岳国兰
李成力
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SUZHOU ELE ELECTRICAL APPLIANCE MANUFACTURING Co Ltd
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SUZHOU ELE ELECTRICAL APPLIANCE MANUFACTURING Co Ltd
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Priority to CN 201220601053 priority Critical patent/CN202917948U/en
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Publication of CN202917948U publication Critical patent/CN202917948U/en
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Abstract

The utility model relates to a protective device for electrical wiring. The protective device comprises a phase line conductor, a zero line conductor, a ground wire conductor, a switching device, a rectifier bridge, a first residual current detection circuit, a second residual current detection circuit, a signal processing circuit, a signal drive circuit and an excitation device. The first residual current detection circuit detects the residual currents of the phase line conductor and the zero line conductor. The second residual current detection circuit detects the residual current of the ground wire conductor. The signal processing circuit and the signal drive circuit can independently generate a first drive signal and a second drive signal. The protective device enables detection on the residual currents of the phase line conductor and the zero line conductor and detection on the residual current of the ground wire conductor to be carried out independently, and increases reliability of detection and security of the protective device.

Description

The electricity Wiring protection device
Technical field
The utility model relates to Electrical Safety protection field, relates in particular to the electric Wiring protection device of the breaking characteristics that have between input and the output.
Background technology
Because terminal block is lack of standardization, might there be false wiring in the supply socket of household electrical appliance, links to each other with phase line for example with phase line and the zero line improved cross connect of socket, or with ground wire, the easy like this casing insulation hydraulic performance decline that causes electrical appliance or charged causes electric shock accidents to occur.
Existing Aftercurrent protecting equipment with the wiring status function that detects supply socket, mode commonly used has two classes: the first kind is that current transformer of employing detects the residual current in phase, zero, the ground wire simultaneously; Equations of The Second Kind is for adopting two current transformers, be that one of them current transformer detects the residual current in phase, the zero line, and another current transformer detects the residual current in the ground wire, and the current transformer that detects the residual current in phase, the zero line has shared functional module part with signal feedback and/or the control loop of the current transformer that detects the residual current in the ground wire, such as shared amplifying circuit etc.
The shortcoming that first kind mode has is, because a current transformer is simultaneously for detection of the residual current in phase, zero, the ground wire, for example when all having residual current simultaneously in phase, zero, the ground wire, can interfere with each other the detection of residual current in phase, the zero line and detection to residual current in the ground wire, have potential safety hazard.
Although the Equations of The Second Kind mode has adopted minute other current transformer, but because signal feedback and/or the control loop of two minutes other current transformers have shared functional module, therefore in fact two current transformers can not work fully independently, such as causing two current transformers all can not play the effect that detects residual current when functional module such as the amplifying circuit fault that shares, if all configure a cover functional module such as amplifying circuit for each current transformer then not only increased the complexity of device, also increased cost.
The utility model content
A main purpose of the present utility model is, overcomes defects of the prior art, and a kind of electric Wiring protection device that detects more reliably residual current in phase, zero, the ground wire is provided.
In an embodiment of the present utility model, a kind of electric Wiring protection device has been proposed, it is characterized in that, comprising:
Phase conductor, zero line conductor, gnd conductor;
Switching device, when being configured to be in primary importance so that described phase conductor, zero line conductor, gnd conductor are in conducting state, and when being in the second place so that described phase conductor, zero line conductor, gnd conductor are in off state;
The first residual current detection circuit is configured to detect the residual current of described phase conductor and zero line conductor;
The second residual current detection circuit is configured to detect the residual current of described gnd conductor;
Signal processing circuit is coupled to described the first residual current detection circuit, is configured to produce first in response to the predetermined error conditions of the first residual current detection signal and drives signal;
Signal drive circuit, be coupled to described the second residual current detection circuit, be configured to produce second in response to the predetermined error conditions of the second residual current detection signal and drive signal, wherein, described phase conductor and described zero line conductor provide the voltage bias signal for described signal drive circuit;
Rectifier bridge is used to described signal processing circuit that power supply is provided;
Exciting bank is coupled to described signal processing circuit and described signal drive circuit, is configured to order about described switching device in response to described the first driving signal and described second drives one of signal and is in the described second place.
In an embodiment of the present utility model, comprise current limiting element in described the second residual current detection circuit, for example current-limiting resistance.
In an embodiment of the present utility model, described the first residual current detection circuit comprises a current transformer, described phase conductor and zero line conductor are elementary as described current transformer, and described current transformer secondary is coupled to described signal processing circuit.
In an embodiment of the present utility model, described the second residual current detection circuit comprises a current transformer, and described gnd conductor is elementary as described current transformer, and described current transformer secondary is coupled to described signal drive circuit.
In an embodiment of the present utility model, described signal processing circuit comprises control chip and the first thyristor.
In an embodiment of the present utility model, described signal drive circuit comprises the second thyristor.
Electric Wiring protection device provided by the utility model has the following advantages: on the basis of the complexity that does not increase circuit and cost; improved the measuring ability to residual current; so that can the phase mutual interference with carrying out independently the detection of residual current in the ground wire to the detection of residual current in phase, the zero line, thereby the reliability that detects and the fail safe of device have been increased.
Description of drawings
By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, other features, objects and advantages of the present utility model will become more apparent:
Fig. 1 shows the circuit diagram according to the electric Wiring protection device 100 of an embodiment of the present utility model.
Embodiment
Although following text has been set forth the detailed description of various different execution modes of the present utility model, be to be understood that, the scope of law of the present utility model is defined by the literal of the appended claim of this patent.It is exemplary that detailed description should be construed as merely, be not to describe every kind of possible execution mode of the present utility model, because describe every kind of possible execution mode, even possible, also be unpractical.The technology of utilizing current techniques or researching and developing after day in present patent application can realize various interchangeable execution modes, and this will fall in the scope that defines claim of the present utility model.
Fig. 1 shows the circuit diagram according to the electric Wiring protection device 100 of an embodiment of the present utility model.As shown in the figure, electric Wiring protection device 100 comprises: phase conductor 110, zero line conductor 120, gnd conductor 130, switching device 140, the first residual current detection circuit 150, the second residual current detection circuit 160, signal processing circuit 170, signal drive circuit 180, rectifier bridge BD and exciting bank 190.
Phase conductor 110 comprises input terminal 111 and outlet terminal 117.Zero line conductor 120 comprises input terminal 121 and outlet terminal 127.Gnd conductor 130 comprises input terminal 131 and outlet terminal 137.Input terminal 111,121,131 is usually according to certain standard arrangement, fixing, and stretches out from the shell of Wiring protection device 100, thereby forms plug.Outlet terminal 117,127,137 is respectively applied to connect the respective terminal of electrical appliance.
When switching device 140 is configured to be in primary importance so that described phase conductor 110, zero line conductor 120, gnd conductor 130 are in conducting state, and when being in the second place so that described phase conductor 110, zero line conductor 120, gnd conductor 130 are in off state.Particularly, the switching device 140 among this embodiment comprises switch 141, the switch 142 in the zero line conductor 120 and the switch 143 in the gnd conductor 130 in the phase conductor 110.Switching device 140 is in primary importance and all is in closure state corresponding to three switches, is in the second place and all is in off-state corresponding to three switches.
Rectifier bridge BD is used to described signal processing circuit 170 that power supply is provided.Particularly, as shown in the figure, two inputs of this rectifier bridge BD connect respectively phase conductor and zero line conductor, and the output negativing ending grounding of this rectifier bridge BD, and output plus terminal is connected to signal processing circuit 170.The output plus terminal of rectifier bridge BD is connected to the feeder ear of chip IC 1 in order to be chip power supply via resistance R 2 on the one hand, and the anode that is connected on the other hand thyristor Q1 is for providing forward bias voltage between the anode of thyristor Q1 and the negative electrode.
The first residual current detection circuit 150 is configured to detect the residual current of phase conductor 110 and zero line conductor 120.Particularly, residual current detection circuit 150 comprises a current transformer 151, phase conductor 110 and zero line conductor 120 forms the elementary of current transformers 151, generates the first residual current detection signal by the secondary induction of current transformer 151, and with this signal coupling to signal processing circuit 170.
Signal processing circuit 170 is coupled to the first residual current detection circuit 150, is configured to produce first in response to the predetermined error conditions of the first residual current detection signal and drives signal.Particularly, signal processing circuit 170 comprises control chip IC 1 and the first thyristor Q1 etc.The predetermined error conditions of the first residual current detection signal is to surpass a predetermined value, and the safety standard that this predetermined value is followed according to electric Wiring protection device 100 and the detection sensitivity of corresponding device are determined.The secondary control chip IC1 that is coupled to of current transformer 151.When the first residual current detection signal reaches its predetermined error conditions, positive level signal of control chip IC1 output is to the control utmost point of the first thyristor Q1, because what load between the anode of the first thyristor Q1 and the negative electrode is the forward bias voltage that is provided by rectifier bridge BD, therefore the first thyristor Q1 conducting that will be triggered.
When the first thyristor Q1 conducting in the signal processing circuit 170, will flow through large electric current, thereby cause on the solenoid SOL in rectifier bridge BD and the exciting bank 190 and correspondingly flow through large electric current, this large current signal is first and drives signal.
The second residual current detection circuit 160 is configured to detect the residual current of gnd conductor 130.Particularly, the second residual current detection circuit 160 comprises a current transformer 161, gnd conductor 130 forms the elementary of current transformers 161, generates the second residual current detection signal by the secondary induction of current transformer 161, and with this signal coupling to signal drive circuit 180.
Signal drive circuit 180 is coupled to described the second residual current detection circuit 160, is configured to produce second in response to the predetermined error conditions of the second residual current detection signal and drives signal.Particularly, signal drive circuit 180 comprises the second thyristor Q2, wherein the anode of the second thyristor Q2 is connected to phase conductor 110 via the solenoid SOL in the exciting bank 190, the negative electrode of the second thyristor Q2 is connected to zero line conductor 120, thereby the voltage bias signal (i.e. forward bias voltage between the anode and cathode of the second thyristor Q2) of the second thyristor Q2 of signal drive circuit 180 is provided by phase conductor 110 and zero line conductor 120.The positive half cycle of the alternating voltage between phase line and zero line will be loaded with forward bias voltage between the anode of the second thyristor Q2 and the negative electrode.
The predetermined error conditions of the second residual current detection signal is to surpass another predetermined value, and the safety standard that this predetermined value is followed according to electric Wiring protection device 100 and the detection sensitivity of corresponding device are determined.The secondary second thyristor Q2 that is coupled in the signal drive circuit 180 of current transformer 161.Particularly, secondary output one end of current transformer 161 connects the negative electrode of the second thyristor Q2 in the signal drive circuit 180 and jointly is connected to zero line conductor 120, and the other end of the secondary output of current transformer 161 at first is connected in series current limiting element, it is resistance R 6 in this embodiment, be connected on the one hand subsequently the control utmost point of the second thyristor Q2 in the signal drive circuit 180, and be connected on the other hand an end of resistance R 7 and capacitor C 8, and the other end of resistance R 7 and capacitor C 8 jointly is connected to the negative electrode of the second thyristor Q2 and therefore is connected to zero line conductor 120, as shown in Figure 1.Wherein, the effect of capacitor C 1 is the antijamming capability of raising system, with the stability of this protective device of effective guarantee; Resistance R 7 is used for regulating electric current.
When the second residual current detection signal reaches its predetermined error conditions, particularly, the amplitude of the alternating current that the alternating current that namely produces in the ground wire conductor induces in current transformer has surpassed a certain numerical value, and then the alternating voltage amplitude that the second residual current detection circuit 160 that is coupled to signal drive circuit 180 produces has also surpassed a certain numerical value, and what meanwhile load between the anode of the second thyristor Q2 and the negative electrode is the forward bias voltage positive half cycle of this alternating voltage (namely), the second thyristor Q2 conducting that will be triggered.
When the second thyristor Q2 conducting in the signal drive circuit 180, will flow through large electric current, thereby cause on the solenoid SOL in the exciting bank 190 and correspondingly flow through large electric current, this large current signal is second and drives signal.
Exciting bank 190 is coupled to described signal processing circuit 170 and described signal drive circuit 180, is configured to order about described switching device 140 in response to described the first driving signal and described second drives one of signal and is in the described second place.Particularly, owing in phase line and zero line, detect leakage current produce first drive signal and since in ground wire, detect leakage current produce the second driving signal can be respectively or jointly order about described switching device 140 and be in the described second place.Be the detection of leakage current in phase line and the zero line and correspondingly to the detection of leakage current in the control of described switching device 140 and the ground wire and correspondingly to the control of described switching device 140 be carry out independently and can not influence each other, so just increased the reliability that detects and the fail safe of device.
Particularly, exciting bank 190 comprises solenoid SOL.Solenoid SOL one end is connected to phase conductor 110, and the other end connects input of rectifier bridge BD and the anode of the second thyristor Q2.
Coupling between exciting bank 190 and the switching device 140 can adopt the machine driving coupling usually.Also comprise the armature that can move along the radial in the electromagnet that solenoid SOL twines.Three switches 141 of switching device 140,142,143 return pins via reset button, substantially with the radially vertical elements such as snap close of return pin, be coupled to armature by machine driving.When switching device 140 was in primary importance, three switches all were in closure state, the circuit normal operation.When producing the first driving signal and/or the second driving signal because of circuit abnormality; will in solenoid SOL, flow through large electric current; cause that thereby armature moves pulling or bump snap close; thereby snap close breaks away from the engagement release return pin with return pin; return pin drives related elements so that switch 141,142,143 disconnects; thereby switching device 140 is in the second place, and being electrically connected between Wiring protection device 100 input sides and the outlet side cut off, and electrical safety is guaranteed.
When being in the normal operation of primary importance and circuit from input side incoming transport power supply, switching device 140, the LED energising is shinny, with the indication normal operating conditions.Comprise that the branch road two ends of resistance R 5 and switch 102 are connected across respectively phase conductor and the zero line conductor of current transformer 151 both sides.When Closing Switch 102, produce residual current at elementary phase conductor and zero line conductor as current transformer 151, thereby cause that signal processing circuit 170 produces the driving signal, exciting bank 190 cuts off the electrical connection between input side and the outlet side in response to this and so that switching device 140 returns to the second place.
In sum; no matter be when the first thyristor Q1 conducting; produced first and driven signal; or when the second thyristor Q2 conducting; produced second and driven signal; perhaps the first driving signal and the second driving signal produce simultaneously; exciting bank 190 all orders about switching device 140 in response to driving signal and is in the second place; that is the position that all disconnects of switch 141,142,143; thereby cut off being electrically connected between Wiring protection device 100 input sides and the outlet side, guaranteed electrical safety.
Although in accompanying drawing and aforesaid description, illustrate in detail and described the utility model, should think that this is illustrated and describes is illustrative and exemplary, rather than restrictive; The utility model is not limited to above-mentioned execution mode.
The those skilled in the art of those the art can be by research specification, disclosed content and accompanying drawing and appending claims, and understanding and enforcement are to other changes of the execution mode of disclosure.In the claims, word " comprises " element and the step of not getting rid of other, and wording " one ", " one " are not got rid of plural number.In the practical application of utility model, the function of a plurality of technical characterictics of quoting during a part possibility enforcement of rights requires.Any Reference numeral in the claim should not be construed as the restriction to scope.

Claims (6)

1. an electric Wiring protection device is characterized in that, comprising:
Phase conductor (110), zero line conductor (120), gnd conductor (130);
Switching device (140), when being configured to be in primary importance so that described phase conductor (110), zero line conductor (120), gnd conductor (130) are in conducting state, and when being in the second place so that described phase conductor (110), zero line conductor (110), gnd conductor (110) are in off state;
The first residual current detection circuit (150) is configured to detect the residual current of described phase conductor (110) and zero line conductor (120);
The second residual current detection circuit (160) is configured to detect the residual current of described gnd conductor (130);
Signal processing circuit (170) is coupled to described the first residual current detection circuit (150), is configured to produce first in response to the predetermined error conditions of the first residual current detection signal and drives signal;
Signal drive circuit (180), be coupled to described the second residual current detection circuit (160), be configured to produce second in response to the predetermined error conditions of the second residual current detection signal and drive signal, wherein, described phase conductor (110) provides the voltage bias signal with described zero line conductor (120) for described signal drive circuit (180);
Rectifier bridge (BD) is used to described signal processing circuit (170) that power supply is provided;
Exciting bank (190), be coupled to described signal processing circuit (170) and described signal drive circuit (180), be configured to order about described switching device (140) in response to described the first driving signal and described second drives one of signal and be in the described second place.
2. electric Wiring protection device according to claim 1 is characterized in that, comprises current limiting element in described the second residual current detection circuit (160).
3. electric Wiring protection device according to claim 1; it is characterized in that; described the first residual current detection circuit (150) comprises a current transformer (151); described phase conductor (110) and zero line conductor (120) are elementary as described current transformer (151), the secondary described signal processing circuit (170) that is coupled to of described current transformer (151).
4. electric Wiring protection device according to claim 1; it is characterized in that; described the second residual current detection circuit (160) comprises a current transformer (161); described gnd conductor (130) is elementary as described current transformer (161), the secondary described signal drive circuit (180) that is coupled to of described current transformer (161).
5. electric Wiring protection device according to claim 1 is characterized in that, described signal processing circuit (170) comprises control chip (IC1) and the first thyristor (Q 1).
6. electric Wiring protection device according to claim 1 is characterized in that, described signal drive circuit (180) comprises the second thyristor (Q2).
CN 201220601053 2011-12-28 2012-11-14 Protective device for electrical wiring Expired - Lifetime CN202917948U (en)

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CN 201220601053 CN202917948U (en) 2011-12-28 2012-11-14 Protective device for electrical wiring

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CN201110447303 2011-12-28
CN201110447303.4 2011-12-28
CN 201220601053 CN202917948U (en) 2011-12-28 2012-11-14 Protective device for electrical wiring

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CN 201220601053 Expired - Lifetime CN202917948U (en) 2011-12-28 2012-11-14 Protective device for electrical wiring

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103187703A (en) * 2011-12-28 2013-07-03 苏州益而益电器制造有限公司 Electric wiring protection device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8332815D0 (en) * 1983-12-08 1984-01-18 Ashley Accessories Ltd Electrical accessories
CN102290689B (en) * 2011-06-23 2013-02-20 刘睿刚 Earth leakage protection plug
CN103187703B (en) * 2011-12-28 2016-06-22 苏州益而益电器制造有限公司 Electrical connection protection device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103187703A (en) * 2011-12-28 2013-07-03 苏州益而益电器制造有限公司 Electric wiring protection device
CN103187703B (en) * 2011-12-28 2016-06-22 苏州益而益电器制造有限公司 Electrical connection protection device

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CN103187703A (en) 2013-07-03

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Granted publication date: 20130501

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