CN104993332B - Miniature earth leakage protective socket - Google Patents
Miniature earth leakage protective socket Download PDFInfo
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- CN104993332B CN104993332B CN201510471466.4A CN201510471466A CN104993332B CN 104993332 B CN104993332 B CN 104993332B CN 201510471466 A CN201510471466 A CN 201510471466A CN 104993332 B CN104993332 B CN 104993332B
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Abstract
The invention discloses miniature earth leakage protective socket, including jack body, the jack body is provided with some general-purpose jacks and a plug, coupled between plug and the general-purpose jack by a power bus, power bus includes power firestreak end, zero-power line end and ground-side of power, the power firestreak end and zero-power line end are coupled in a transformer, the transformer is coupled with leakage protection circuit, the transformer is coupled with a simulation electric leakage module, the simulation electric leakage module includes a manual contact, when manual contact is pressed, the transformer exports leakage current；The leakage protection circuit, including sampling module, judge module, performing module；The sampling module is coupled to the output end of transformer, for leakage current of sampling；The judge module is coupled to sampling module, and when transformer produces leakage current, output performs signal；Performing module is coupled to judge module, when receiving execution signal, jumps disconnected power supply of the external power source to socket.
Description
Technical field
The present invention relates to a kind of socket, more specifically, it relates to miniature earth leakage protective socket.
Background technology
Socket, also known as power outlet, switch socket, including some international general-purpose holes and a plug, can be inserted into each by it
Wiring is planted, is easy to connect with other circuits, is multiple power supply for electrical equipment, in order to meet protection requirements, general socket is also set
Leakage protection circuit is equipped with, for the power supply of the disconnecting plug end of incoming cables when there is leakage current, to play to electrical equipment
Protective effect；
Likewise, socket water inlet or human body touch live wire part in socket general-purpose hole by mistake, it can also cause the power supply electricity of socket
Occur high current in line so that the adaptive polarizing memory voltage time constant action in leakage protection circuit, peace is improved so as to play one and prevent from getting an electric shock
The effect of full property, and the function of leakage protection circuit, are indispensable critical function for socket, and internationally recognized
For the important basis for estimation of safety index.
But general socket only set a leakage protection circuit control relay device drives contact action it is disconnected to realize
Electricity is powered, but is due to that actuating mechanism, adaptive polarizing memory voltage time constant, sampling coil, decision circuitry are all likely to occur problem, any one mould
Block goes wrong all can be so that there is misoperation in leakage protection circuit, if false tripping is disconnected, then whole socket cannot be by just
Often use；If not jumping disconnected when electric leakage, then produced problem can directly influence the personal safety of user.And sampling is sentenced
Deenergizing precision also to reach higher standard, can equally influence the security for judging and using at present；
For the single socket of function, the problem of it corresponds to security is less, as function is more enriched, in design,
Need the safeguard procedures done on circuit also more and more, because the security of socket directly affects the normal work of electrical equipment
Situation and service life, and it is corresponding, it is necessary to which a kind of can improve the multipurpose socket of security.
The content of the invention
In view of the deficienciess of the prior art, it is an object of the invention to provide the micro- of a kind of high accuracy and tape test function
Type earth leakage protective socket.
To achieve the above object, the invention provides following technical scheme：Miniature earth leakage protective socket, including socket sheet
Body, the jack body is provided with total by a power supply between some general-purpose jacks and a plug, plug and the general-purpose jack
Line is coupled, and power bus includes power firestreak end, zero-power line end and ground-side of power, the power firestreak end and zero-power line
End is coupled in a transformer, and the transformer is coupled with leakage protection circuit, and the transformer is coupled with simulation electric leakage mould
Block, the simulation electric leakage module includes a manual contact, when manual contact is pressed, and the transformer exports leakage current；
The leakage protection circuit, including sampling module, judge module, performing module；The sampling module is coupled to the defeated of transformer
Go out end, for leakage current of sampling；The judge module is coupled to sampling module, when transformer produces leakage current, output
Perform signal；Performing module is coupled to judge module, when receiving execution signal, jumps disconnected power supply of the external power source to socket.
In this way, under normal circumstances, it is identical with common leakage protection circuit operation principle, when being produced when leaking electricity, fire
Electric current on line or zero line increases suddenly, and transformer collects curent change, and current value is sampled by sampling module, warp
Cross after judge module judgement, by execution circuit control work, concrete operating principle is more or less the same with leakage protection circuit, herein
Do not repeat, it is contemplated that a kind of simulation electric leakage module of design, simulation electric leakage module includes a manual contact, user passes through
Manual contact simulation drain conditions are pressed, if all modules do not go wrong in leakage protection circuit, then will jump disconnected
Power supply of the external power source to socket, and module sets reasonable, facilitates Expanding design and understanding, if external power source is pressed in user
The power supply to socket is remained in that after pressure manual contact, then user can just know that a module goes out in its leakage protection circuit
Existing problem, can be overhauled to reduce the possibility of potential safety hazard appearance to it.
The present invention can be further arranged to：SR is additionally provided with the socket, for recovering external power source pair
The power supply of socket.By setting SR manually, it can recover when leakage protection circuit or other safety circuits jump electricity
Power supply to socket, difference is set with total button switch, will not recover the confession to socket in the case of unwitting because of user
Electricity, it is simple and reasonable, and ensure that the reasonability of setting.
The present invention can be further arranged to：The jack body is additionally provided with the different USB interface of some power outputs,
The power firestreak end and zero-power line end are coupled with power supply circuit, and the power supply circuit is used for AC conversion into direct current
To USB interface.Set power supply circuit to be used to meet USB the direct current supplys such as expansion on the basis of original earth leakage protective, ensureing
While security, the function of the present invention is added, and the function setting overcomes on jack body, there is manufacture easy to use
Deficiency above in the market original security with USB socket.
The present invention can be further arranged to：The power supply circuit includes rectification voltage reduction module, for defeated to external communication
The alternating current entered carries out rectification decompression and exports a supply voltage；Switch power module, including an output end and a compensating end；Phase
Magnet exciting coil, output winding, the feedback coil of mutual coupling, the output end that the magnet exciting coil is coupled to switch power module are used to
Excitation is carried out to output winding；The output winding is to load supplying；The feedback coil is coupled to switch power module
Compensating end；The feedback coil sampling one follows the feedback current of the output current size of output winding, the Switching Power Supply
Module compensates output to the exciting current of magnet exciting coil so that output current is certain value according to feedback current.
By in this way, magnet exciting coil, output winding can be powered to it, and by feedback coil to output
Electric current sampled, switch power module is according to the difference of output current value, output compensation so that its electric current exported is one
Steady state value, situations such as can so ensureing output current not because of load change disturbs, and is carried out by rectification voltage reduction module
Supply current is inputted, and outside AC conversion directly is carried out into electricity consumption into direct current, external adapter is instead of, more facilitated
Rationally.
The present invention can be further arranged to：Charging circuit is coupled between the power supply circuit and each USB interface,
The charging circuit detects electrical equipment charged state, and reminds user to charge when electrical equipment is in Full Power State
Into.
The present invention can be further arranged to：The charging circuit includes detection module, is series at the power supply of USB interface
End, and a sampled voltage is provided；Lithium battery protection module, is coupled to detection module, receives sampled voltage and exports charged state
Level；Base modules, set a reference level；Comparison module, compares charged state level and reference level, and output indication is believed
Number；Indicating module, is coupled to comparison module, including two light-emitting components, and one light-emitting component is controlled according to indication signal state
Work.Charged state can be protected by lithium battery protection module in charging, its principle and USB first charge electricity
The principle of the lithium battery protection module on road is similar, but in charging complete, the one of output pin of lithium battery protection module
Current potential can change, using this potential change set logic judgment, utilize charging unfinished and after the completion of current potential become
Change, by this reference of reference level, output indication signal control indicating module, so as to control two light-emitting component outputs different
Signal to remind user's charging complete.
The present invention can be further arranged to：Also include the first lightning protection circuit, first lightning protection circuit includes the first inspection
Unit and the second detection unit are surveyed, first detection unit, which is coupled to power firestreak end, to be used to detect overvoltage in real time, and defeated
Go out first detection signal, second detection unit, which is coupled to zero-power line end, to be used to detect overvoltage in real time, and export second
Signal is detected, first detection unit is coupled to first gas discharge tube with the second detection unit, and the first gas is put
Fulgurite detects signal to realize keying in response to first detection signal or second.Pass through the first detection unit, the second detection unit
Live wire, zero line are detected in real time, it is to avoid forget the situation that lightning protection function is opened and causes electrical equipment to damage occur.
The present invention can be further arranged to：First detection unit and the second detection unit are piezo-resistance.
The present invention can be further arranged to：Piezo-resistance is provided between the power firestreak end and zero-power line end.
The operation principle of piezo-resistance is as follows：When the voltage being added in piezo-resistance is less than its threshold value, the electric current for flowing through it is minimum,
Its infinitely great resistance of equivalent to one resistance.That is, when the voltage being added in above it be less than its threshold value when, it equivalent to
The switch of one off-state；When the voltage being added in piezo-resistance exceedes its threshold value, flow through its electric current and increase sharply, its phase
When in the infinitesimal resistance of resistance.That is, when the voltage being added in above it is higher than its threshold value, its equivalent to one closure
The switch of state.Its principle is similar to TVS pipe.
The present invention can be further arranged to：Second lightning protection circuit includes second gas discharge tube, the second coil, the
Three gas-discharge tubes and tertiary coil, the second gas discharge tube are series at power firestreak end, second coils from parallel connection of coils in
Second gas discharge tube, the third gas discharge tube is series at zero-power line end, and the tertiary coil is parallel to third gas
Discharge tube.The operation principle of gas-discharge tube is gas discharge, when applied voltage increases above the dielectric strength of gas, two
Discharge breakdown is converted into the electricity after conduction state, conducting between discharge tube the two poles of the earth by the gap of interpolar by original state of insulation
Pressure maintains the residual voltage level that electric arc channel is determined of putting.
By using above-mentioned technical proposal, compared with prior art, following effect is served：Under normal circumstances, with it is common
Leakage protection circuit operation principle is identical, when being produced when leaking electricity, and the electric current on live wire or zero line increases suddenly, transformer collection
Sampled to curent change, and by current value by sampling module, after judge module judges, work is controlled by execution circuit
Make, concrete operating principle is more or less the same with leakage protection circuit, and therefore not to repeat here, it is contemplated that a kind of simulation electric leakage of design
Module, simulation electric leakage module includes a manual contact, and user simulates drain conditions by pressing manual contact, if electric leakage is protected
All modules do not go wrong in protection circuit, then will jump power supply of the disconnected external power source to socket, and module sets reasonable,
Facilitate Expanding design and understanding, if external power source remains in that the power supply to socket after user presses manual contact, that
User can just know that a module goes wrong in its leakage protection circuit, can be overhauled hidden to reduce safety to it
Suffer from the possibility occurred.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is leakage protection circuit schematic diagram of the invention；
Fig. 3 is rectification voltage reduction module schematic diagram of the invention；
Fig. 4 is power supply circuit schematic diagram of the invention；
Fig. 5 is the first charging circuit schematic diagram of the invention；
Fig. 6 is the second charging circuit schematic diagram of the invention；
Fig. 7 is leakage protection circuit schematic diagram of the present invention.
Reference：1st, jack body；2nd, the first USB interface；3rd, secondary USB interface；4th, testing button；5th, reset and press
Button；6th, power supply indicator；110a, sampling module；120a, judge module；130a, performing module；140a, simulation electric leakage module；
150a, transformer；210a, rectification voltage reduction module；211a, voltage regulation unit；220a, switch power module；231a, magnet exciting coil；
232a, output winding；233a, feedback coil；241a, the first filter unit；242a, the second filter unit；243a, output are single
Member；310a, detection module；311a, the first sampling unit；312a, the second sampling unit；320a, lithium battery protection module；330a, base
Quasi-mode block；340a, comparison module；350a, indicating module；400a, wiring board circuit；410a, the first lightning protection circuit；411a,
One detection unit；410a, the second detection unit；420a, the second lightning protection circuit；430a, detection control circuit；440a, instruction electricity
Road.
Embodiment
It is described further referring to figs. 1 to 7 pairs of embodiment of the present invention.
As shown in figure 1, miniature earth leakage protective socket, including some general-purpose jacks and a plug, the plug and general-purpose are inserted
Coupled between hole by a power bus, power bus includes power firestreak end, zero-power line end and ground-side of power, socket sheet
Include the first USB interface 2 and secondary USB interface 3 on body 1, the charging current corresponding to two USB interfaces is different, the first USB
The corresponding charging current of interface 2 is 2.5A, quick to the progress of the equipment such as mobile phone by the first USB interface 2 to allow
Charging, and the corresponding charging current of secondary USB interface 3 is 1.2A, in order to which ordinary appliances can be charged normal, two differences
USB interface with suitable for different environment and state, left if worrying, quick charge can be used, if not being eager to leave,
Common charging modes can be then used, while being also provided with testing button 4 and SR 5 on jack body, are pressed by test
Button is to realize to whether wiring board has drain conditions, if having no problem, and directly presses SR 5 and can be achieved to reset, from
And wiring board is normally used, power supply indicator 6 is additionally provided with jack body and corresponding with the first USB interface 2
First indicator lamp, second indicator lamp corresponding with secondary USB interface 3；Display work is situated so as to by above-mentioned indicator lamp
State, is easy to user to understand the state of charging.
Leakage protection circuit and lightning protection circuit, which are directly connected to bus, to be used to detect the Current Voltage situation of bus,
And rectification voltage reduction module and power supply circuit be used to providing a galvanic current be depressed into charging circuit to USB interface carry out it is defeated
Go out.
Shown in reference picture 2, leakage protection module is described in detail, the power firestreak end and zero-power line end are coupled in one
Transformer 150a, the transformer 150a are coupled with leakage protection circuit, and the transformer 150a is coupled with simulation electric leakage mould
Block 140a, the simulation electric leakage module 140a include a manual contact, and when manual contact is pressed, the transformer 150a is defeated
Go out leakage current；The leakage protection circuit, including sampling module 110a, judge module 120a, performing module 130a；It is described to adopt
Egf block 110a is coupled to transformer 150a output end, for leakage current of sampling；The judge module 120a, which is coupled to, to be adopted
Egf block 110a, when transformer 150a produces leakage current, output performs signal；Performing module 130a is coupled to judge module
120a, when receiving execution signal, jumps disconnected power supply of the external power source to socket.The simulation electric leakage module 140a is coupled to power supply
Between zero line and zero-power line end, including the first artifical resistance and the second artifical resistance being arranged in series with manual contact.
In other embodiment, the judge module 120a can be configured as any chip, and it is with realizing signal input/output function i.e.
It can be used as the chip being configured, preferred judge module 120a is configured as SN4140 chips in the present embodiment.The sampling
Module 110a includes being series at transformer 150a the first derided capacitors and the second derided capacitors, first derided capacitors and the
The node of two derided capacitors coupling is connected to the 3rd pin of SN4140 chips；First derided capacitors are set to 100nf, the second partial pressure
Electric capacity is provided with 10nf, to provide 2.9V voltage of voltage regulation.
Sampling capacitance and sampling resistor have been also coupled between the second pin and the first derided capacitors of the SN4140 chips,
The sampling capacitance capacity is set to 10uf, and sampling resistor is set to 10 ohm.8th pin of the SN4140 chips and
Reset capacitance is coupled between one pin, reset capacitance capacity is set to 22uf；First pin of the SN4140 chips and
Pull-up resistor has been also coupled between four pins.Pull-up resistor resistance is set to 30K Europe, and the performing module 130a is set including series connection
The relay and controllable silicon put, its model are set to MCR100-8, and the controlled terminal of the controllable silicon is coupled to the SN4140 cores
7th pin of piece, the negative electrode of the controllable silicon is connected to the 6th pin.It is coupled with and posts between the controllable silicon negative electrode and controlled terminal
Raw electric capacity, the parasitic capacitance is set to 10nf.6th pin of the SN4140 chips is coupled with indicating module, the instruction
Module includes protective resistance, light emitting diode, the protection diode being arranged in series.Coupling between power firestreak end and zero-power line end
Piezo-resistance is connected to, the protective resistance is set to 39 kilo-ohms, and the R6 and R7 are connected to SN4140 the 5th pin, and resistance is set
For 68K Europe, the piezo-resistance model is set to 7D471.
Shown in reference picture 3, rectification voltage reduction module 210a, the alternating current for being inputted to external communication carries out rectification decompression simultaneously
Export a supply voltage；Rectification voltage reduction module 210a uses BM10F to be depressured chip with for rectification, and the DC decompression module is also wrapped
Including voltage regulation unit a 211a, the voltage regulation unit 211a includes the first electric capacity of voltage regulation C8 and the first voltage regulation resistance being arranged in series
R10, the node coupled between the first electric capacity of voltage regulation C8 and the first voltage regulation resistance R10 is used to export supply voltage.It is described steady
Pressure unit 211a also include the second electric capacity of voltage regulation C7 and the first voltage stabilizing inductance L4, the first voltage stabilizing inductance L4 that are arranged in series with
The first voltage regulation resistance R10 is arranged in parallel.First voltage regulation resistance R10 resistances are set to 470 ohm, and the first electric capacity of voltage regulation C8 is set
8.8uF/400V is set to, the second electric capacity of voltage regulation C7 is set to 8.8uF/400V.
Shown in reference picture 4, switch power module 220a, including an output end and a compensating end；The switch power module
220a is configured as CX7181 chips, and the feedback coil 233a is coupled to the CX7181 chips by a feedback resistance R15
The 3rd pin.Feedback resistance R15 resistances are set to 20K Europe, output end and the CX7181 cores of the rectification voltage reduction module 210a
The first dropping resistor R8 and the second dropping resistor R12, the first dropping resistor R8 and the second drop are in series between first pin of piece
Piezoresistance R12 resistances are set to 100K ohm, for providing operating voltage, the second dropping resistor R12 and feedback electricity for VDD
Resistance R15 between be coupled with power down diode, pawn electric diode it is breakdown when, the CX7181 chip power-downs, its second pin
It is provided with C11 electric capacity and R16 resistance is provided between the 3rd pin, the resistance of R16 resistance is set to 2.7K ohm, the 4th
Pin is provided with three R17, R18, R19 being arranged in parallel with ground terminal, and its resistance is disposed as 2.7K ohm, and equivalent resistance is
900 ohm, the 6th pin is used for constant current output and is provided with shroud module, the shroud module include being arranged in series the
One mask capacitor C6, the first shielding resistance R11 and the first shielding diode D3, the negative electrode of the first shielding diode D3 with
Secondary shielding resistance R9 is also coupled between the output end of rectification module, the first shielding resistance R11 resistances are set to 100 ohm,
Secondary shielding resistance R9 resistances are set to 10000 ohm and play a part of power dissipation.
Magnet exciting coil 231a, output winding 232a, the feedback coil 233a, the magnet exciting coil 231a couplings intercoupled
In switch power module 220a output end to output winding 232a carry out excitation；The output winding 232a is to negative
Carry power supply；The feedback coil 233a is coupled to switch power module 220a compensating end；
The feedback coil 233a samplings one follow the feedback current of output winding 232a output current size, described to open
Powered-down source module 220a compensates output to magnet exciting coil 231a exciting current so that output current is certain according to feedback current
Value.The output winding 232a is coupled with output module, and the output module includes the filtering of the first filter unit 241a and second
Unit 242a, the first filter unit 241a include the first filter resistance R14 and the first filter capacitor C9 being arranged in series；Institute
State the second filter resistance R13 and the second filter capacitor C10 that the second filter unit 242a includes being arranged in series.First filtering filtering
Electric capacity is set to 10V/470uF, and the first filter resistance R14 resistances are set to 1K ohm, and the second filter resistance R13 resistances are set to
220 ohm.The output module, which also includes output unit 243a, the output unit 243a, includes output diode D2 and defeated
Go out inductance L3, the first filter capacitor C9 and the second filter capacitor C10 and be coupled to the output diode D2 and output electricity
Feel the node of L3 couplings.Output diode D2 is set to LSL1045B.
5 pair of first charging circuit of reference picture is described in detail, and first charging circuit includes detection module 310a, is series at
The feeder ear of USB interface, and a sampled voltage is provided；The detection module 310a includes the samplings of the first sampling unit 311a and second
Portion 312a, the first sampling unit 311a include the first sampling resistor R35 and the second sampling resistor R41 being arranged in parallel；It is described
Second sampling unit 312a includes the 3rd resistor and the 4th resistance, the first sampling unit 311a and the second sampling unit being arranged in parallel
The first detection resistance R29 is also coupled between 312a, the first detection resistance R29 resistances are adjustable.First sampling resistor R35 and
Second resistance resistance is set to 50 ohm, even 300 ohm of the 3rd sampling resistor R26 and the 4th sampling resistor R30 resistances,
One detection resistance R29 resistances are preferably 0 ohm.
Lithium battery protection module 320a, is coupled to detection module 310a, receives sampled voltage and exports charged state level；
The lithium battery protection module 320a is configured as CECL1303 chips, its first pin coupling output charged state level, and it the
Four pins are coupled to sampled voltage.The 3rd protection has been also coupled between the first pin and the 4th pin of the CECL1303 chips
Resistance R20, the 4th protective resistance R21 has been also coupled between the 4th pin and charging voltage of the CECL1303 chips.
Base modules 330a, sets a reference level；The base modules 330a includes the first benchmark electricity being arranged in series
Resistance and the first reference capacitance, the node of the first reference resistance and the first reference capacitance coupling provide reference level.First base
Quasi- resistance is set to 220 ohm.
Comparison module 340a, compares charged state level and reference level, and output indication signal；The comparison module
340a is configured as 1BA11 chips, and its 4th pin is connected to reference level, and its 6th pin is connected to charged state level, and it
Three pins and the first pin are connected to indicating module 350a.
Indicating module 350a, is coupled to comparison module 340a, including two light-emitting components, is controlled according to indication signal state
One light-emitting component works.The indicating module 350a includes the first instruction unit and the second instruction unit, the first instruction unit bag
Include the first light emitting diode being arranged in series and the first luminous protective resistance R22；Second instruction unit includes being arranged in series
The second light emitting diode and the second luminous protective resistance R23.First luminous protective resistance R22 is set to 470 ohm, second
Luminous protective resistance R23 resistances are set to 470 ohm.
6 pair of second charging circuit of reference picture is described in detail, and the second charging circuit includes detection module 310a respectively, series connection
In the feeder ear of USB interface, and provide a sampled voltage；Detection module 310a includes the 5th sampling resistor R38 being arranged in series
It is connected to the first sampling capacitance C17, the first sampling capacitance C17 between power line ground terminal and power supply low level, the 5th
Sampling resistor R38 resistances are set to 50 ohm, because the first charging circuit and the second charging circuit power output are different, so its
There is also difference for requirement of the sample circuit to precision.First sampling capacitance C17 models are set to JN102M, low for eliminating power supply
The sampling interference that level change is produced between level and power line ground terminal.
Lithium battery protection module 320a, is coupled to detection module 310a, receives sampled voltage and exports charged state level；
The lithium battery protection module 320a is configured as CECL1303 chips.
The 3rd protective resistance R31 has been also coupled between the first pin and the 4th pin of the CECL1303 chips, it is described
The 4th protective resistance R28 has been also coupled between the 4th pin and charging voltage of CECL1303 chips.3rd protective resistance hinders R31
Value is set to 100K Europe, and the 4th protective resistance R28 resistances are set to 10K ohm, due to power dissipation.
Base modules 330a, sets a reference level；The base modules 330a includes the first benchmark electricity being arranged in series
The node for hindering R33 and the first reference capacitance C16, the first reference resistance R33 and the first reference capacitance C16 couplings provides benchmark
Level.First reference resistance R33 resistances are set to 220 ohm.
Comparison module 340a, compares charged state level and reference level, and output indication signal；The comparison module
340a is configured as 1BA11 chips, and its 4th pin is connected to reference level, and its 6th pin is connected to charged state level, and it
Three pins and the first pin are connected to indicating module 350a.
Indicating module 350a, is coupled to comparison module 340a, including two light-emitting components, is controlled according to indication signal state
One light-emitting component works.The indicating module 350a includes the first instruction unit and the second instruction unit, the first instruction unit bag
Include the first light emitting diode being arranged in series and the first luminous protective resistance R24；Second instruction unit includes being arranged in series
The second light emitting diode and the second luminous protective resistance R27.The first luminous luminous protective resistances of protective resistance R24 and second
R27 resistance is disposed as 470 ohm.
Shown in reference picture 7, lightning protection circuit is described in detail, wiring board circuit 400a is provided with the first lightning protection circuit 410a,
First lightning protection circuit 410a includes first gas discharge tube GDT1, the first lightning protection circuit 410a include the first detection unit 411a with
First detection unit 412a, the first detection unit 411a is piezo-resistance RV1, and the first detection unit 412a is piezo-resistance RV2.
The operation principle of piezo-resistance is as follows：When the voltage being added in piezo-resistance is less than its threshold value, its is flowed through
Electric current is minimum, its infinitely great resistance of equivalent to one resistance.That is, when the voltage being added in above it is less than its threshold value
When, its switch equivalent to an off-state；When the voltage being added in piezo-resistance exceedes its threshold value, its electricity is flowed through
Stream increases sharply, and it is equivalent to the infinitesimal resistance of resistance.That is, when the voltage being added in above it is higher than its threshold value, its phase
When in the switch of a closure state.
First detection unit 411a, which is coupled to live wire, to be used to detect overvoltage in real time, and export first detection signal, first
Detection unit 412a, which is coupled on zero line, to be used to detect overvoltage in real time, and exports the second detection signal, the first detection unit
411a and the first detection unit 412a are coupled to first gas discharge tube GDT1, and first gas discharge tube GDT1 is in response to first
Detection signal or the second detection signal are to realize keying, and first gas discharge tube GDT1 is two pole discharge tubes, two pole discharge tubes
One end is connected with piezo-resistance RV1, piezo-resistance RV2, other end ground connection, single by the first detection unit 411a, the first detection
First 412a is detected in real time to live wire, zero line, it is to avoid forget the situation that lightning protection function is opened and causes electrical equipment to damage occur.
The operation principle of gas-discharge tube is gas discharge, when applied voltage increases above the dielectric strength of gas,
Discharge breakdown is converted into after conduction state, conducting between discharge tube the two poles of the earth by the gap of two interpolars by original state of insulation
Voltage maintains the residual voltage level that electric arc channel is determined of putting.
By piezo-resistance RV1 and piezo-resistance RV2 effect, the high voltage produced by thunderbolt is detected, by pressing
Quick resistance RV1 is detected to live wire, and piezo-resistance RV2 is detected to zero line, if piezo-resistance RV1 resistance diminishes,
Then illustrate the high voltage for having caused by thunderbolt on live wire；If piezo-resistance RV2 resistance diminishes, illustrate there is thunder on zero line
Hit caused high voltage；If piezo-resistance RV1 resistance and piezo-resistance RV2 resistance diminish, illustrate zero line, live wire
On exist thunderbolt caused by high voltage；No matter above-mentioned in the case of which kind of, the electric current by brought surge of being struck by lightning is flowed into
First gas discharge tube GDT1 carries out aerial drainage.
Wiring board circuit 400a is also coupled to the first thunder-lightning including the second lightning protection circuit 420a, the second lightning protection circuit 420a
Between road 410a and load, the second lightning protection circuit 420a includes second gas discharge tube GDT2, the second coil L2, third gas and put
Fulgurite GDT3 and tertiary coil L3, second gas discharge tube GDT2 are series on live wire, and the second coil L2 is parallel to second gas
Discharge tube GDT2, third gas discharge tube GDT3 is series on zero line, and tertiary coil L3 is parallel to third gas discharge tube GDT3.
By the electric current for brought surge of being struck by lightning is very big, and the first lightning protection circuit 410a can exist and will can not be increased sharply
The risk that electric current has been let out completely, so a second lightning protection electric current is being set, it is right to prevent the electric current increased sharply from not let out
Electrical equipment produces infringement.
First lightning protection circuit 410a and load between provided with detection control circuit 430a, detection control circuit 430a be it is pressure-sensitive
Resistance RV3, detection control circuit 430a one end are coupled to live wire, and the other end is coupled to zero line, and detection unit is used to examine in real time
Overvoltage is surveyed, and in response to overvoltage with by wiring board circuit 400a short circuits, when the first lightning protection circuit 410a is damaged due to failure
Bad when, then aerial drainage is not carried out to the electric current of surge, so that the high voltage produced by thunderbolt is detected by piezo-resistance RV3,
So that piezo-resistance RV3 resistance diminishes, electric current directly flows into zero line from live wire by piezo-resistance RV3, so as to will entirely insert
Line plate circuit 400a short circuits, it is to avoid caused damage to the load for accessing wiring board, and can normal work in the first lightning protection circuit 410a
When making, then detection control circuit 430a does not work.
Indicating circuit 440a, indicating circuit 440a bags are provided between first lightning protection circuit 410a and detection control circuit 430a
It is coupled to after including protective resistance and indicator lamp, protective resistance R9 and indicator lamp LED strip connection between live wire and zero line, when the first lightning protection
During circuit 410a normal works, it indicates that lamp LED can be lighted normally, if during the first lightning protection circuit 410a damages, detection control
Circuit 430a work processed is simultaneously short-circuit by wiring board circuit 400a, while indicator lamp LED extinguishes.
First lightning protection circuit 410a, indicating circuit 440a, detection control circuit 430a and the second lightning protection circuit 420a are successively
It is coupled between live wire and zero line.
Described above is only the preferred embodiment of the present invention, and protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
Those of ordinary skill for, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (1)
1. miniature earth leakage protective socket, including jack body, the jack body are provided with some general-purpose jacks and a plug, institute
State by power bus coupling between plug and general-purpose jack, power bus includes power firestreak end, zero-power line end and electricity
Source ground terminal, the power firestreak end and zero-power line end are coupled in a transformer, and the transformer is coupled with earth leakage protective electricity
Road, it is characterised in that：The transformer is coupled with a simulation electric leakage module, and the simulation electric leakage module includes a manual contact,
When manual contact is pressed, the transformer exports leakage current；The leakage protection circuit, including sampling module, judgement
Module, performing module；The sampling module is coupled to the output end of transformer, for leakage current of sampling；The judge module
Sampling module is coupled to, when transformer produces leakage current, output performs signal；Performing module is coupled to judge module, connects
When receiving execution signal, disconnected power supply of the external power source to socket is jumped；
SR is additionally provided with the socket, for recovering power supply of the external power source to socket；
The jack body is additionally provided with the different USB interface of some power outputs, the power firestreak end and zero-power line end
It is coupled with power supply circuit, the power supply circuit is used for AC conversion into direct current to USB interface；
Charging circuit is coupled between the power supply circuit and each USB interface, the charging circuit detection electrical equipment is filled
Electricity condition, and remind user's charging complete when electrical equipment is in Full Power State；The charging circuit includes：Detect mould
Block, is series at the feeder ear of USB interface, and provide a sampled voltage；Lithium battery protection module, is coupled to detection module, receives
Sampled voltage simultaneously exports charged state level；Base modules, set a reference level；Comparison module, compares charged state level
With reference level, and output indication signal；Indicating module, is coupled to comparison module, including two light-emitting components, is believed according to instruction
The control one light-emitting component work of number state；
The power supply circuit includes
Rectification voltage reduction module, the alternating current for being inputted to external communication carries out rectification decompression and exports a supply voltage；
Switch power module, including an output end and a compensating end；
Magnet exciting coil, output winding, the feedback coil intercoupled, the magnet exciting coil is coupled to the output of switch power module
End to output winding to carry out excitation；The output winding is to load supplying；The feedback coil is coupled to switch electricity
The compensating end of source module；
The feedback coil sampling one follows the feedback current of the output current size of output winding, the switch power module root
Output is compensated to the exciting current of magnet exciting coil so that output current is certain value according to feedback current；
Also include the first lightning protection circuit, first lightning protection circuit includes the first detection unit and the second detection unit, described the
One detection unit, which is coupled to power firestreak end, to be used to detect overvoltage in real time, and export first detection signal, second detection
Unit be coupled to zero-power line end be used in real time detect overvoltage, and export second detect signal, first detection unit and
Second detection unit is coupled to first gas discharge tube, and the first gas discharge tube is in response to first detection signal or second
Signal is detected to realize keying；
First detection unit and the second detection unit are piezo-resistance；
Piezo-resistance is provided between the power firestreak end and zero-power line end；
Also include the second lightning protection circuit, second lightning protection circuit includes second gas discharge tube, the second coil, third gas and put
Fulgurite and tertiary coil, the second gas discharge tube are series at power firestreak end, and second coils from parallel connection of coils is in second gas
Discharge tube, the third gas discharge tube is series at zero-power line end, and the tertiary coil is parallel to third gas discharge tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510471466.4A CN104993332B (en) | 2015-08-04 | 2015-08-04 | Miniature earth leakage protective socket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510471466.4A CN104993332B (en) | 2015-08-04 | 2015-08-04 | Miniature earth leakage protective socket |
Publications (2)
| Publication Number | Publication Date |
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| CN104993332A CN104993332A (en) | 2015-10-21 |
| CN104993332B true CN104993332B (en) | 2017-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510471466.4A Active CN104993332B (en) | 2015-08-04 | 2015-08-04 | Miniature earth leakage protective socket |
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| CN (1) | CN104993332B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106611927A (en) * | 2015-10-22 | 2017-05-03 | 深圳市同盛绿色科技有限公司 | Conversion socket |
| WO2017066960A1 (en) * | 2015-10-22 | 2017-04-27 | 深圳市同盛绿色科技有限公司 | Adapter socket |
| CN108134273B (en) * | 2017-12-08 | 2023-12-12 | 刘冰冰 | Power safety socket circuit controlled by low-voltage detection |
| CN108011350A (en) * | 2017-12-29 | 2018-05-08 | 烟台欣飞智能系统有限公司 | A kind of mobile phone charging head anti-electric shock apparatus, charger, wall socket and insert row |
| CN107994661A (en) * | 2017-12-29 | 2018-05-04 | 烟台欣飞智能系统有限公司 | A kind of mobile phone charging head safety guard, charger, wall socket and insert row |
| CN109194162A (en) * | 2018-09-20 | 2019-01-11 | 重庆镭云光电科技有限公司 | Safe socket DC power supply with storage function |
Citations (1)
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|---|---|---|---|---|
| CN201278420Y (en) * | 2008-09-17 | 2009-07-22 | 林锋 | Intelligent multifunctional electric power socket |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100444491C (en) * | 2004-12-01 | 2008-12-17 | Tcl王牌电子(深圳)有限公司 | Novel lightning protecting device used for display device |
| CN2819527Y (en) * | 2005-08-04 | 2006-09-20 | 北京突破电气有限公司 | Lightning-protecting jack converter |
| CN201117986Y (en) * | 2007-08-21 | 2008-09-17 | 沈国新 | Multifunctional combined socket |
| CN201341028Y (en) * | 2008-10-14 | 2009-11-04 | 飞毛腿(福建)电子有限公司 | Mobile power supply |
| CN102916389B (en) * | 2011-08-05 | 2015-11-25 | 苏州益而益电器制造有限公司 | Electricity Wiring protection device |
| CN202268696U (en) * | 2011-09-13 | 2012-06-06 | 苏州益而益电器制造有限公司 | Electric wiring protection device for detecting power supply false wiring condition |
| CN103762859A (en) * | 2014-02-26 | 2014-04-30 | 杨华新 | Non-electrolytic isolated type syntonic switching power supply |
| CN104505667A (en) * | 2014-12-26 | 2015-04-08 | 佛山市顺德区信辉达电子有限公司 | Voltage conversion type leakage protection plug |
| CN204992157U (en) * | 2015-08-04 | 2016-01-20 | 温州骋航电器有限公司 | Miniature earth leakage protection socket |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201278420Y (en) * | 2008-09-17 | 2009-07-22 | 林锋 | Intelligent multifunctional electric power socket |
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| CN104993332A (en) | 2015-10-21 |
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Effective date of registration: 20201013 Address after: 226300 Zixing Village Group 7, Xingdong Town, Tongzhou District, Nantong City, Jiangsu Province Patentee after: Nantong Baoxue Refrigeration Equipment Co.,Ltd. Address before: Yongjia County of Wenzhou City, Zhejiang province 325100 bridge town Mei Ao Village Patentee before: WENZHOU CHENGHANG ELECTRICAL APPLIANCE Co.,Ltd. |
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