CN106711923B - Isolating and protecting device and electric power system - Google Patents

Isolating and protecting device and electric power system Download PDF

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Publication number
CN106711923B
CN106711923B CN201710088666.0A CN201710088666A CN106711923B CN 106711923 B CN106711923 B CN 106711923B CN 201710088666 A CN201710088666 A CN 201710088666A CN 106711923 B CN106711923 B CN 106711923B
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China
Prior art keywords
isolating
relay
signal
output
output terminal
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CN201710088666.0A
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CN106711923A (en
Inventor
马健
马骥
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Who Can (tianjin) Technology Co Ltd
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Who Can (tianjin) Technology Co Ltd
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks

Abstract

The present invention provides a kind of isolating and protecting device and electric power systems, are related to isolating and protecting device and electric power system technical field, can effectively prevent the moist influence to power circuit.The isolating and protecting device includes sensor circuit and isolating chip;The current signal of the sensor circuit sensing ac output end, generates inductive signal, and the inductive signal is transmitted to the isolating chip;The isolating chip generates isolation carrier signal, and the isolation carrier signal is exported to ac output end according to the inductive signal.

Description

Isolating and protecting device and electric power system
Technical field
The present invention relates to safe power supply technical field, more particularly, to a kind of isolating and protecting device and electric power system.
Background technology
With the development of power technology, industrial-frequency alternating current (i.e. alternating current) has spread all over each family and unit, electricity consumption Safety also becomes more and more important.
Current alternating current is usually powered by two output lines, wherein one is firewire, another is zero curve.In family or list The environment of water is particularly frequently used in toilet, kitchen etc., between firewire and zero curve when electricity consumptions scene is in dampness in position It is easy to because of the moist or generation short circuit that gets wet.When aging circuit, breakage, firewire and zero curve can be exposed to outside, as It is moist or get wet and make short circuit occurs between firewire and zero curve.
Short circuit occurs between firewire and zero curve, is easy to cause fire, and electrical equipment and power supply unit can be caused to damage Etc. adverse consequences.At present, for the damp-proof problem of supply line, the measures such as generally use anti-blushing agent, moisture-proof glue, by anti-blushing agent Or moisture-proof glue is coated in the position that circuit, socket etc. easily make moist, get wet, using the insulation of anti-blushing agent or moisture-proof glue, moisture proof, The characteristics such as anticreep, anticorrosion, Inverter fed motor, the safety of maintenance electric line.
But it is difficult to cover the every nook and cranny of power circuit using anti-blushing agent or moisture-proof glue, and anti-blushing agent or moisture-proof glue Effect also can slowly degenerate at any time, therefore the prior art is difficult to that power circuit is effectively prevent to be influenced by humidity.
Invention content
In view of this, the purpose of the present invention is to provide a kind of isolating and protecting device and electric power systems, can effectively prevent The only moist influence to power circuit.
In a first aspect, an embodiment of the present invention provides a kind of isolating and protecting device, including sensor circuit and isolating chip;
The current signal of the sensor circuit sensing ac output end, generates inductive signal, and the inductive signal is passed Transport to the isolating chip;
The isolating chip generates isolation carrier signal, and the isolation carrier signal is exported according to the inductive signal To ac output end.
With reference to first aspect, an embodiment of the present invention provides the first possible embodiment of first aspect, wherein, it should Isolating and protecting device further includes rectification circuit;
The input terminal connection ac output end of the rectification circuit, the output terminal of the rectification circuit connect the isolated core The power end of piece.
With reference to first aspect, an embodiment of the present invention provides second of possible embodiment of first aspect, wherein, institute Rectification circuit is stated as rectifier bridge.
With reference to first aspect, an embodiment of the present invention provides the third possible embodiment of first aspect, wherein, institute It states isolating chip and includes N-channel technotron, comparator and carrier generator;
The grid of the N-channel technotron connects the sensor circuit, source electrode ground connection, and drain electrode connects the comparison The input terminal of device;
The output terminal of the comparator connects the input terminal of the carrier generator, and the output terminal of the carrier generator leads to Cross diode connection ac output end;
The comparator exports comparison signal according to the N-channel technotron drain current, and the carrier wave occurs Device is according to the comparison signal outgoing carrier signal.
With reference to first aspect, an embodiment of the present invention provides the 4th kind of possible embodiment of first aspect, wherein, institute It states and trigger is further included in isolating chip;
The input terminal of the trigger connects the output terminal of the comparator;
When the comparison signal exceeds preset value, the trigger exports power-off signal.
With reference to first aspect, an embodiment of the present invention provides the 5th kind of possible embodiment of first aspect, wherein, institute It states sensor circuit and includes inductive reactance, the inductive reactance is connected between the isolating chip and ac output end.
With reference to first aspect, an embodiment of the present invention provides the 6th kind of possible embodiment of first aspect, wherein, institute It states sensor circuit and further includes the inductance capacitance being of coupled connections with the inductive reactance.
Second aspect, the embodiment of the present invention also provide a kind of electric power system, including transformer and above-mentioned insulation blocking Device;
The primary coil connection power grid of the transformer, the connection ac output end of the secondary coil of the transformer.
With reference to second aspect, an embodiment of the present invention provides the first possible embodiment of second aspect, wherein, it should Electric power system further includes the first relay and the second relay;
Isolating chip in the isolating and protecting device includes trigger;
The control coil of first relay connects the output terminal of the trigger, the output terminal of first relay It connects with the control coil of second relay, the output terminal of second relay is connected with the primary coil.
With reference to second aspect, an embodiment of the present invention provides second of possible embodiment of second aspect, wherein, institute The first relay is stated as closed type relay, second relay is normal-open type relay.
The embodiment of the present invention brings following advantageous effect:
In isolating and protecting device provided in an embodiment of the present invention, including sensor circuit and isolating chip.Wherein, sensor circuit Sense the current signal of ac output end, generate inductive signal, and inductive signal is transmitted to isolating chip.Isolating chip according to Inductive signal generation isolation carrier signal, and isolation carrier signal is exported to ac output end.
Using isolating and protecting device provided in an embodiment of the present invention, when exchanging output line by humidity or when getting wet, sensing Circuit can sense the abnormal current on circuit, and generate inductive signal and be sent to isolating chip.Isolating chip is according to sensing The intensity of signal generates the isolation carrier signal of corresponding amplitude, makes alternating current so that the formal systemization of carrier wave is isolated and stablizes output, And buffer action is played, it avoids that short circuit occurs between two exchange output lines, so as to effectively prevent humidity to power circuit Influence.
Other features and advantages of the present invention will illustrate in the following description, also, partly become from specification It obtains it is clear that being understood by implementing the present invention.The purpose of the present invention and other advantages are in specification, claims And specifically noted structure is realized and is obtained in attached drawing.
For the above objects, features and advantages of the present invention is enable to be clearer and more comprehensible, preferred embodiment cited below particularly, and coordinate Appended attached drawing, is described in detail below.
Description of the drawings
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution of the prior art Embodiment or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, in being described below Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the schematic diagram of isolating and protecting device that the embodiment of the present invention one provides;
Fig. 2 is another schematic diagram of isolating and protecting device that the embodiment of the present invention one provides;
Fig. 3 is the schematic diagram of isolating chip in the isolating and protecting device that the embodiment of the present invention one provides;
Fig. 4 is the schematic diagram of electric power system provided by Embodiment 2 of the present invention.
Specific embodiment
Purpose, technical scheme and advantage to make the embodiment of the present invention are clearer, below in conjunction with attached drawing to the present invention Technical solution be clearly and completely described, it is clear that described embodiment be part of the embodiment of the present invention rather than Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Lower all other embodiments obtained, shall fall within the protection scope of the present invention.
At present, it is difficult to cover the every nook and cranny of power circuit, and anti-blushing agent or moisture-proof glue using anti-blushing agent or moisture-proof glue Effect also can slowly degenerate at any time, therefore the prior art is difficult to that power circuit is effectively prevent to be influenced by humidity.
A kind of isolating and protecting device provided in an embodiment of the present invention and electric power system can effectively prevent humidity to electric power The influence of circuit.
Embodiment one:
An embodiment of the present invention provides a kind of isolating and protecting devices, can be applied to the electricity consumptions scene such as family or unit.Such as Fig. 1 Shown in Fig. 2, which includes sensor circuit and isolating chip.The electric current letter of sensor circuit sensing ac output end Number, inductive signal is generated, and inductive signal is transmitted to isolating chip.Sensor circuit is connected in two ac output ends b, d Wherein one end, the present embodiment illustrates by taking sensor circuit connection ac output end b as an example.
Isolating chip generates isolation carrier signal, and isolation carrier signal is exported by diode D0 according to inductive signal To ac output end.
Sensor circuit in the present embodiment includes inductive reactance R, and inductive reactance R is connected to isolating chip and ac output end Between.Further, inductance capacitance C1, the C2 being of coupled connections with inductive reactance R are further included in sensor circuit.
Current signal on ac output end b, by the coupling effect between inductive reactance R and inductance capacitance C1, C2, Inductive signal is generated, and reacts circuit and the inductive signal is transmitted to isolating chip.
In the present embodiment, inductance capacitance C1, C2 are adjustable condenser, in order to be suitable for a variety of different environment, sense The specific size of capacitance C1, C2 is answered setting can be adjusted according to the voltage of application scenarios, current conditions in manufacture.
Further, further include rectification circuit in isolating and protecting device provided in an embodiment of the present invention.Rectification circuit Two input terminals connect ac output end b, d, the power end of the output terminal connection isolating chip of rectification circuit, so as to hand over respectively It is direct current to flow output terminal b, d rectification, and provides DC power supply for isolating chip.
As a preferred embodiment, the rectification circuit in the present embodiment is rectifier bridge.Rectifier bridge is specifically by four rectifications two Pole pipe D1, D2, D3, D4 connection composition, rectifier diode D1 is connected with the anode of rectifier diode D3, rectifier diode D2 with it is whole The cathode of stream diode D4 is connected, and the anode of the cathode of rectifier diode D1 connection rectifier diode D2, rectifier diode D3 Cathode connection rectifier diode D4 anode.Within each work period of rectifier bridge, the same time, only there are two diodes It works, by the one-way conduction function of diode, strong alternating current is converted into unidirectional DC pulse voltage.
As shown in figure 3, the isolating chip in the present embodiment includes field-effect tube T, comparator and carrier generator, midfield Effect pipe T is specially N-channel technotron.The drain electrode d of the input terminal connection field-effect tube T of comparator, comparator it is defeated Outlet connects the input terminal of carrier generator, and the output terminal of carrier generator connects ac output end by diode.
The grid g connection sensor circuits of field-effect tube T, source electrode s ground connection, the input terminal for the d connection comparators that drain.Junction type field Effect transistor (Junction Field-Effect Transistor, abbreviation JFET) is by PN junction grid, source electrode and drain electrode A kind of three-terminal active device with enlarging function formed, is one kind common in monopole field-effect tube, and junction field is brilliant It can be divided to two kinds of N-channel and P-channel to body pipe, using N-channel technotron in the present embodiment.
In the present embodiment, the source electrode s ground connection of field-effect tube T, drain electrode d provide positive voltage by comparator, makes the voltage of source electrode s Less than the voltage of drain electrode d, the grid g connection sensor circuits of field-effect tube T receive negative voltage inductive signal.Grid g is in source electrode s Between voltage Vgs negative value increase, the resistance for making raceway groove increase, and drain current Id reduction.This is because N-type semiconductor Internal electronics is repelled by the electric field that grid negative potential is formed, and thicker depletion layer is generated around P areas, N-type semiconductor Conducting channel narrows, and drains to the electric current between source electrode and reduces.Due to such characteristic, drain current Id can be by gate-source voltage The control of Vgs.
With the variation of the inductive signal of sensor circuit output, the drain current Id of field-effect tube T can also change.Leakage Electrode current Id is input to comparator, you can current power network current is detected using comparator.
After comparator receives the drain current Id of field-effect tube T, by the benchmark electricity inside drain current Id and comparator Stream is compared, and exports corresponding comparison signal.
Carrier generator exports corresponding carrier signal according to the situation of change of comparison signal.When the ratio of comparator output During compared with signal in normal range (NR), carrier signal is smoothly isolated in carrier generator output amplitude, defeated the mode of carrier wave is isolated Go out stable alternating current.When exchanging output line by humidity or when getting wet, comparator can very high (abnormal) ratio of output intensity Compared with signal, carrier generator answers the isolation carrier signal of amplitude, makes alternating current to be isolated according to the intensity of comparison signal, the output phase The formal systemization of carrier wave stablizes output, and plays buffer action, avoids that short circuit occurs between two exchange output lines, so as to Enough it effectively prevent the moist influence to power circuit.
Further, isolating chip further includes trigger in the embodiment of the present invention.The input terminal connection of trigger is compared The output terminal of device.When comparison signal exceeds the preset value inside trigger, trigger output power-off signal disconnects transmission line of electricity Power supply.
Using isolating and protecting device provided in an embodiment of the present invention, when exchanging output line by humidity or when getting wet, sensing Circuit can sense the abnormal current on circuit, and generate inductive signal and be sent to comparator, and comparator is according to abnormal sense Very high (abnormal) comparison signal of induction signal life intensity, and the comparison signal of the exception is sent to isolating chip.Isolated core Piece generates the isolation carrier signal of corresponding amplitude, makes alternating current so that the formal system of carrier wave is isolated according to the intensity of comparison signal Change and stablize output, and play buffer action, avoid that short circuit occurs between two exchange output lines, so as to effectively prevent humidity Influence to power circuit.
Embodiment two:
As shown in figure 4, the embodiment of the present invention also provides a kind of electric power system, including transformer TB and above-described embodiment one The isolating and protecting device provided.Wherein, the primary coil connection power grid of transformer TB, the both ends of the secondary coil of transformer TB Connection ac output end d and ac output end b respectively exports alternating current.
Further, electric power system provided in this embodiment further includes the first relay J1 and the second relay J2.The The output terminal of isolating chip in the control coil connection isolating and protecting device of one relay J1, the output terminal of the first relay J1 It connects with the control coil and control power supply of the second relay J2, the output terminal of the second relay J2 and the primary line of transformer Circle series connection.
As a preferred embodiment, the first relay when the first relay J1 is closed type relay, i.e. coil no power The output of J1 is in closed state.Meanwhile second relay J2 be normal-open type relay, i.e. coil no power when the first relay The output terminal of device J1 is off.
In the case of electric power system normal power supply, the coil no power of the first relay J1, the first relay J1's is defeated Outlet is in closed state, therefore controls power supply can be by the first relay J1 to the coil power supply of the second relay J2.Second In the case of energization, output is continued the coil of relay J2 in closed state with the primary coil for maintaining transformer Power supply.Meanwhile the output terminal of isolating chip is exported without power-off signal.
When the trigger element in isolating chip sends out power-off signal, the coil of the first relay J1 is powered, make first after The output terminal of electric appliance J1 disconnects.Since the output terminal of the first relay J1 disconnects, the coil blackout of the second relay J2 makes The output terminal of second relay J2 disconnects, so as to cut off the connection of the primary coil of power grid and transformer, to cut off electric power system Power supply, so as to fulfill the protection of supply line.
In the present embodiment, the first relay J1 uses closed type relay, and the second relay J2 uses normal-open type relay It has further the advantage that:It, can be in the output terminal and the second relay J2 of the first relay J1 in the practical electric power system The relay for multiple and different purposes of connecting between coil, such as the relay of overload protection, the relay of overvoltage protection, with And the relay for short-circuit protection.These relays are also all using closed type relay, and each output terminal of relay Coil all with the second relay J2 is connected, then when wherein any one relay disconnects, can make the second relay J2's Coil blackout, so as to cut off the power supply of electric system.
Electric power system provided in an embodiment of the present invention has identical with the isolating and protecting device that above-described embodiment one provides Technical characteristic so can also solve the technical issues of identical, reaches identical technique effect.
In addition, in the description of the embodiment of the present invention unless specifically defined or limited otherwise, term " installation ", " phase Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or be integrally connected;It can To be mechanical connection or be electrically connected;It can be directly connected, can also be indirectly connected by intermediary, Ke Yishi Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition Concrete meaning in invention.
In the description of the present invention, it should be noted that term " " center ", " on ", " under ", "left", "right", " vertical ", The orientation or position relationship of the instructions such as " level ", " interior ", " outer " be based on orientation shown in the drawings or position relationship, merely to Convenient for the description present invention and simplify description rather than instruction or imply signified device or element must have specific orientation, With specific azimuth configuration and operation, therefore it is not considered as limiting the invention.
In addition, term " first ", " second ", " third " are only used for description purpose, and it is not intended that instruction or implying phase To importance.
Finally it should be noted that:Embodiment described above, only specific embodiment of the invention, to illustrate the present invention Technical solution, rather than its limitations, protection scope of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair It is bright to be described in detail, it will be understood by those of ordinary skill in the art that:Any one skilled in the art In the technical scope disclosed by the present invention, it can still modify to the technical solution recorded in previous embodiment or can be light It is readily conceivable that variation or equivalent replacement is carried out to which part technical characteristic;And these modifications, variation or replacement, do not make The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover the protection in the present invention Within the scope of.Therefore, protection scope of the present invention described should be subject to the protection scope in claims.

Claims (7)

1. a kind of isolating and protecting device, which is characterized in that including sensor circuit and isolating chip;
The current signal of the sensor circuit sensing ac output end, generates inductive signal, and the inductive signal is transmitted to The isolating chip;The sensor circuit is connected to the isolating chip with exchanging including inductive reactance R, the inductive reactance R Between output terminal, inductance capacitance C1, the C2 being of coupled connections with the inductive reactance R are further included in the sensor circuit;
Current signal on ac output end is imitated by the coupling between the inductive reactance R and described inductance capacitance C1, C2 Should, inductive signal is generated, and react circuit and the inductive signal is transmitted to the isolating chip;
The isolating chip generates isolation carrier signal, and the isolation carrier signal is exported best friend according to the inductive signal Flow output terminal;
The isolating chip includes N-channel technotron, comparator and carrier generator;
The grid of the N-channel technotron connects the sensor circuit, source electrode ground connection, and drain electrode connects the comparator Input terminal;
The output terminal of the comparator connects the input terminal of the carrier generator, and the output terminal of the carrier generator passes through two Pole pipe connects ac output end;
The comparator exports comparison signal, the carrier generator root according to the N-channel technotron drain current According to the comparison signal outgoing carrier signal.
2. isolating and protecting device according to claim 1, which is characterized in that further include rectification circuit;
The input terminal connection ac output end of the rectification circuit, the output terminal of the rectification circuit connect the isolating chip Power end.
3. isolating and protecting device according to claim 2, which is characterized in that the rectification circuit is rectifier bridge.
4. isolating and protecting device according to claim 1, which is characterized in that further include trigger in the isolating chip;
The input terminal of the trigger connects the output terminal of the comparator;
When the comparison signal exceeds preset value, the trigger exports power-off signal.
5. a kind of electric power system, which is characterized in that including transformer and as the isolation of Claims 1-4 any one of them is protected Protection unit;
The primary coil connection power grid of the transformer, the secondary coil connection ac output end of the transformer.
6. electric power system according to claim 5, which is characterized in that further include the first relay and the second relay;
Isolating chip in the isolating and protecting device includes trigger;
The control coil of first relay connects the output terminal of the trigger, the output terminal of first relay and institute The control coil series connection of the second relay is stated, the output terminal of second relay is connected with the primary coil.
7. electric power system according to claim 6, which is characterized in that first relay be closed type relay, institute The second relay is stated as normal-open type relay.
CN201710088666.0A 2017-02-17 2017-02-17 Isolating and protecting device and electric power system Active CN106711923B (en)

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CN201710088666.0A CN106711923B (en) 2017-02-17 2017-02-17 Isolating and protecting device and electric power system
PCT/CN2017/088119 WO2018149063A1 (en) 2017-02-17 2017-06-13 Isolation protection apparatus and power supply system

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CN106711923B true CN106711923B (en) 2018-06-19

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CN106711923B (en) * 2017-02-17 2018-06-19 中领世能(天津)科技有限公司 Isolating and protecting device and electric power system
CN106711922B (en) * 2017-02-17 2018-06-08 中领世能(天津)科技有限公司 Electrical shock protective device and electric power system
CN107086554A (en) * 2017-05-26 2017-08-22 中领世能(天津)科技有限公司 Electric power system and its multi-stage protection device

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