CN102931645B - Ground wire live protection circuit and method and air conditioner with circuit - Google Patents
Ground wire live protection circuit and method and air conditioner with circuit Download PDFInfo
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- CN102931645B CN102931645B CN201110227327.9A CN201110227327A CN102931645B CN 102931645 B CN102931645 B CN 102931645B CN 201110227327 A CN201110227327 A CN 201110227327A CN 102931645 B CN102931645 B CN 102931645B
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- 239000000853 adhesive Substances 0.000 claims description 11
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- 239000002184 metal Substances 0.000 description 12
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- 238000012423 maintenance Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
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- 238000009413 insulation Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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Abstract
The invention discloses a ground wire live protection circuit and method and an air conditioner with the circuit. This ground wire live protection circuit includes: a first detection circuit (a) for detecting a current in the ground line; the first end of the relay (B) is connected with the zero line, and the second end of the relay (B) is connected with the ground wire; the driving circuit (C) is connected with the third end of the relay (B) and is used for driving the relay (B) to suck; and the microprocessor (D) is connected between the first detection circuit (A) and the drive circuit (C) and is used for judging whether the current in the ground wire is greater than a preset current value or not and controlling the drive circuit (C) to drive the relay (B) to attract when the current in the ground wire is greater than the preset current value so as to connect the ground wire with the zero line. The invention can detect the current flowing through the ground wire of the electric appliance in real time, and once the current value exceeds the safe current value of the human body, the ground wire in the circuit is connected with the zero line, thereby avoiding the safety accident of electric shock of the human body.
Description
Technical field
The present invention relates to appliance field, in particular to a kind of ground wire live protection circuit, method and the air conditioner with this circuit.
Background technology
The I electric appliances such as domestic air conditioning; force ground connection; the general principle of ground protection is taked to be clamping action by earth resistance; the voltage to earth of leaky site is clamped down within the specific limits, avoids by human body excessive and human body is damaged to the accident even causing electric shock person's death to the electric current of the earth.
The general principle of ground protection is described below:
Suppose that the rated operational voltage of the electric heating products of a metal shell is V, the equivalent internal resistance of circuit is Rj.Under normal circumstances, metal shell is not charged by insulation and the isolation of inner energized conductor, by the electric current through people's direction of flow the earth after the distributed capacitance coupling of product itself general very little (being called pick-up current or leakage current in electric product safety), can not damage human body.
When the insulation damages of product, as shown in Fig. 1 (a), metal shell can be charged, once human contact's metal shell, people knows from experience and form loop between metal shell and the earth, just has electric current to flow through human body.In normal bad border, the equivalent resistance of human body is about 2k Ω, and the equivalent internal resistance Rj of product is far smaller than the equivalent resistance of human body (such as, for an operating voltage be AC230V, power is the electric heating products of 1500W, its equivalent internal resistance Rj is about 35 Ω), can calculate the current Ib flowing through human body and be about 110mA, electric current large like this flows through human body and may be fatal.
If by suitable means by metal shell ground connection, as shown in Fig. 1 (b), and earth resistance very little (0.1 Ω), still for above-mentioned electric heating products, now flow through the current Ib of human body ' be only 0.3mA, most of electric current is all grounded resistance bypass.Like this, by the metal shell of product is carried out protective earthing, avoid big current and flow through human body and cause the casualty accident that shocks by electricity.
But the earth resistance of current China electric power system ubiquity ground wire is not up to standard, there is electrical potential difference when causing ground wire to have electric current to flow through.When this electrical potential difference is 50V, be 30mA by the electric current of electric shock casualty accident, earth resistance 1666.7 Ω can be obtained, now can think earth resistance and human body resistance approximately equal over the ground, by the characteristic of parallel circuits, the electric current of 30mA is divided into 15mA, the electric current of 15mA breaks away from scope 9 ~ 16mA man, it can thus be appreciated that, when electrical potential difference is less than 50V, ground wire can provide the precondition of available protecting to be to human body: earth resistance is less than 1666.7 Ω, if earth resistance is not up to standard, even if employing ground protection, leakage current still damages human body.
In addition, leak electricity when there being exterior power supply, cause electric current via the metal shell of air conditioner to air conditioner ground wire, when flowing back to the neutral point of electrical network by air conditioner ground wire, the leakage switch of house can not trip, because although electric current is very large for this reason, but zero line in circuit can not be caused, live wire current imbalance, such as, there is the metal frame of power supply three phase unbalance current by being connected with building ground wire, after flowing to air conditioner metallic support, the metal shell of air conditioner is made to have electric current to flow through further, now, once the shell of human contact's air conditioner, will inevitably get an electric shock and damage.
For in correlation technique when the ground wire electrification of electrical equipment, the problem that human contact's electric appliance casing easily gets an electric shock, not yet proposes effective solution at present.
Summary of the invention
Main purpose of the present invention is the air conditioner providing a kind of ground wire live protection circuit, method and have this circuit, during to solve the ground wire electrification of electrical equipment, and the problem that human contact's electric appliance casing easily gets an electric shock.
To achieve these goals, according to an aspect of the present invention, a kind of ground wire live protection circuit is provided.
Ground wire live protection circuit according to the present invention comprises: the first testing circuit, for detecting the electric current in ground wire; Relay, the first terminal connecting zero line, the second terminate ground wire; Drive circuit, is connected with the 3rd end of relay, for driving relay adhesive; And microprocessor, be connected between the first testing circuit and drive circuit, whether the electric current for judging in ground wire is greater than controls drive circuit when pre-set current value and the electric current in ground wire are greater than pre-set current value and drives relay adhesive to be connected with zero line to make ground wire.
Further, ground wire live protection circuit according to the present invention also comprises: current transformer, is arranged on ground wire, is connected with the first testing circuit.
Further, the first testing circuit comprises: the first binding post, comprises the first terminal and the second terminal, and wherein, the first testing circuit is connected to current transformer via the first terminal and the second connecting terminals; Second binding post, comprises the 3rd terminal and the 4th terminal, and wherein, the first testing circuit is connected to microprocessor via the 3rd terminal and the 4th connecting terminals; Amplifying circuit, is connected between the first terminal and the 3rd terminal; First electric capacity, is connected between the first terminal and the first end of amplifying circuit; Second electric capacity, first end is connected with the second end of amplifying circuit; First diode, positive pole is connected with the second end of the second electric capacity, and negative pole is connected to the 3rd terminal; Second diode, positive pole is connected with the first terminal, and negative pole is connected with the second terminal; 3rd diode, positive pole is connected with the second terminal, and negative pole is connected with the first terminal; And the 3rd electric capacity, first end is connected to the 3rd terminal, and the second end and the second terminal and the 4th connecting terminals are connected together and ground connection.
Further, amplifying circuit comprises: triode, grounded emitter; First resistance, first end is connected to the base stage of triode; Second resistance, first end is connected to the second end of the first resistance, the second termination DC power supply of the second resistance; And the 3rd resistance, first end is connected to the second end of the second resistance, second end of the 3rd resistance is connected to the collector electrode of triode, wherein, between the second resistance and the first resistance, be provided with first node, this first node is connected with the first electric capacity, Section Point is provided with between the second resistance and the 3rd resistance, this Section Point connects DC power supply, and be provided with the 3rd node between resistance and the collector electrode of triode the 3rd, the 3rd node is connected with the second electric capacity.
Further; ground wire live protection circuit according to the present invention also comprises: the second testing circuit; be connected with microprocessor, whether connect instead for the live wire and zero line detecting electrical equipment, or whether electrical equipment connect ground wire and the signal detected is sent to microprocessor.
Further, microprocessor comprises: alarm unit, when being greater than pre-set current value for the electric current in ground wire, sends alarm signal; And memory cell, when being greater than pre-set current value for the electric current in ground wire, store alarms state information.
To achieve these goals, according to another aspect of the present invention, a kind of air conditioner is provided.
Air conditioner according to the present invention comprises any one ground wire live protection circuit provided by the invention.
To achieve these goals, according to another aspect of the present invention, a kind of earth wire charged protecting method is provided.
Earth wire charged protecting method according to the present invention comprises: detect the electric current in ground wire; Judge whether the electric current in ground wire is greater than pre-set current value; And the electric current in ground wire is when being greater than pre-set current value, controls ground wire and be connected with zero line.
Further, before detecting the electric current in ground wire, earth wire charged protecting method according to the present invention also comprises: whether the zero line and the live wire that detect electrical equipment connect instead; And connect inverse time at the zero line of electrical equipment and live wire, send alarm signal.
Further, before detecting the electric current in ground wire, earth wire charged protecting method according to the present invention also comprises: detect electrical equipment whether earth connection; And when electrical equipment does not have earth connection, send alarm signal.
Further, before control ground wire is connected with zero line, earth wire charged protecting method according to the present invention also comprises: send alarm signal; And store alarms state information.
By the present invention, adopt the ground wire live protection circuit comprised with lower part: the first testing circuit, for detecting the electric current in ground wire; The relay of the first terminal connecting zero line, the second terminate ground wire; For driving the drive circuit of relay adhesive; And the microprocessor be connected between the first testing circuit and drive circuit, when whether the electric current in ground wire is greater than pre-set current value, drive circuit drives relay adhesive, namely the first end of relay connects with the second end, thus ground wire connects with zero line, when solving the ground wire electrification of electrical equipment, the problem that human contact's electric appliance casing easily gets an electric shock, and then efficiently avoid the generation of human electric shock's security incident, improve the fail safe of electrical equipment.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 (a) is that human body and metal shell form the schematic diagram of current circuit with the earth;
Fig. 1 (b) is that human body, earth resistance form the schematic diagram of current circuit with metal shell and the earth respectively;
Fig. 2 is the schematic diagram of the ground wire live protection circuit according to the embodiment of the present invention;
Fig. 3 is the schematic diagram of the first testing circuit according to the embodiment of the present invention;
Fig. 4 is the schematic diagram of the second testing circuit according to the embodiment of the present invention; And
Fig. 5 is the flow chart of the earth wire charged protecting method according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
First the embodiment of ground wire live protection circuit is introduced.
Fig. 2 is the schematic diagram of the ground wire live protection circuit according to the embodiment of the present invention, and as shown in Figure 2, this ground wire live protection circuit comprises: the first testing circuit A, for detecting the electric current in ground wire; Relay B, the first terminal connecting zero line, the second terminate ground wire; Drive circuit C, is connected with the 3rd end of relay B, for driving relay B adhesive; And microprocessor D, be connected between the first testing circuit A and drive circuit C, whether the electric current for judging in ground wire is greater than controls drive circuit C when pre-set current value and the electric current in ground wire are greater than pre-set current value and drives relay B adhesive, namely the first end of relay B is driven to connect with the second end, the electrical components G in electrical equipment is made (namely to connect zero line in electrical equipment, the charged assembly of live wire, ground wire, such as, compressor in air conditioner, frequency convertor etc.) ground wire connect with zero line.
In this embodiment, the electric current in power ground is detected in real time by the first testing circuit, and testing result is returned to microprocessor D, i.e. MCU, the electric current judged in power ground as MCU is greater than pre-set current value, this pre-set current value is traditionally arranged to be human-body safety current value, when the electric current in ground wire is greater than human-body safety current value, namely during dangerous electric current, send out high level to drive circuit, drive relay adhesive, make ground wire connecting to neutral line, even if when the earth resistance of electrical equipment is not up to standard, or when exterior power supply leakage conductance sends a telegraph the outer casing electrification of device, the timely connecting to neutral line of ground wire, the electric appliance casing electromotive force over the ground connecting ground wire also must be zero, therefore, can not electric shock accidents be there is in human body when contacting the shell of electrical equipment, improve the fail safe making electrical appliance.
Preferably, as shown in Figure 2, this ground wire live protection circuit also comprises: current transformer E, is arranged on ground wire, is connected with the first testing circuit A.This preferred embodiment in, first testing circuit A carries out current detecting by detecting current transformer E to the ground wire of electrical equipment, when the microprocessor D of electrical equipment receives the first testing circuit A, the i.e. testing circuit of current transformer, detect when flowing through dangerous current value in the power ground of electrical equipment, control drive circuit C and drive relay B adhesive.
Fig. 3 is the schematic diagram of the first testing circuit according to the embodiment of the present invention, as shown in Figure 3, first testing circuit A, namely the testing circuit of current transformer comprises: the first binding post 01, comprise the first terminal and the second terminal, wherein, the first testing circuit A is connected to current transformer E via the first terminal and the second connecting terminals; Second binding post 02, comprises the 3rd terminal and the 4th terminal, and wherein, the first testing circuit A is connected to microprocessor D via the 3rd terminal and the 4th connecting terminals; Amplifying circuit 03, is connected between the first terminal and the 3rd terminal; First electric capacity 04, between the first end being connected to the first terminal and amplifying circuit 03; Second electric capacity 05, first end is connected with the second end of amplifying circuit 03; First diode 06, positive pole is connected with the second end of the second electric capacity 05, and negative pole is connected to the 3rd terminal; Second diode 07, positive pole is connected with the first terminal, and negative pole is connected with the second terminal; 3rd diode 08, positive pole is connected with the second terminal, and negative pole is connected with the first terminal; And the 3rd electric capacity 09, first end is connected to the 3rd terminal, and the second end and the second terminal and the 4th connecting terminals are connected together and ground connection, and wherein, the first testing circuit relies on DC power supply 010 to power.
The operation principle of the first testing circuit A is roughly described below:
First binding post 01 shown in lead-out terminal connection layout 3 of current transformer E in Fig. 2, the alternating current that current transformer E induces flows through the first electric capacity 04, again after amplifying circuit 03 amplifies, by the second electric capacity 05, after the halfwave rectifier of the first diode 06 and the filtering of the 3rd electric capacity 09, export a direct voltage to Micro-processor MCV (the microprocessor D namely in Fig. 2) via the second binding post 02, complete the detection of the ground line current of electrical equipment.
The current value that microprocessor D real-time judge first testing circuit A detects, the current value flow through as current transformer E is zero or is less than pre-set current value, namely during dangerous currents value, the magnitude of voltage that microprocessor D obtains, lower than zero connection protection value, therefore can not control drive circuit C and drive relay B to complete ground wire zero connection protection; When the current value that current transformer E flows through is greater than dangerous currents value, the magnitude of voltage that microprocessor D obtains is higher than zero connection protection value, and therefore microprocessor D controls drive circuit C driving relay B in time and completes ground wire zero connection protection.
Alternatively, amplifying circuit 03 comprises: triode 031, grounded emitter; First resistance 032, first end is connected to the base stage of triode 031; Second resistance 033, first end is connected to the second end of the first resistance 032, the second termination DC power supply of the second resistance 033; And the 3rd resistance 034, first end is connected to the second end of the second resistance 033, second end of the 3rd resistance 034 is connected to the collector electrode of triode 031, wherein, first node is provided with between the second resistance 033 and the first resistance 032, this first node is connected with the first electric capacity 04, Section Point is provided with between the second resistance 033 and the 3rd resistance 034, this Section Point connects DC power supply, between the 3rd resistance 034 and the collector electrode of triode 031, be provided with the 3rd node, the 3rd node is connected with the second electric capacity 04.
Preferably; as shown in Figure 2; ground wire live protection circuit also comprises: the second testing circuit F; be connected respectively with the electrical components G in electrical equipment with microprocessor D; for detecting electrical equipment, namely whether live wire and the zero line of electrical components G meet anti-and electrical components G and whether are connected ground wire and the signal detected is sent to microprocessor D.
In this embodiment, can detect whether the live wire that electrical equipment connects and zero line connect instead and whether are connected to ground wire by the second testing circuit F.When the microprocessor D of electrical equipment detects that the power firestreak of electrical equipment and zero line connect inverse time, electrical equipment provides prompting, and forbids start; When detecting that electrical equipment does not connect ground wire, electrical equipment provides prompting.By this preferred implementation; before the ground wire of control apparatus connects with zero line; efficiently avoid because zero line, live wire connect the anti-ground wire that makes and directly receive live wire, also avoid not connecting ground wire and zero connection protection cannot be implemented, thus ensure the fail safe that electrical equipment uses further.
For the second testing circuit F mentioned in the application, be that air conditioner power line connection detection circuit described in the patent application of CN200520065480.6 also achieves similar function at application number, thus, the air conditioner power line connection detection circuit in CN200520065480.6 can be adopted as second testing circuit of the application, as shown in Figure 4, preferably, the second testing circuit F in the application comprises forceful electric power circuit, light current circuit, wherein, connected by relay 10 between forceful electric power circuit and light current circuit.
Wherein, port a2, the port b2 of the binding post 2 of forceful electric power circuit and port c2 start to exchange fire line L, zero line N and ground wire respectively, ground wire are connected to resistance 5 successively, the first port of relay 10 strong power part; Zero line N is connected to the first port of optocoupler 11 strong power part; Live wire L is connected to resistance 3 successively, first port of diode 6 and optocoupler 9 strong power part, second port of the second port of optocoupler 9 strong power part and the second port of relay 10, optocoupler 11 is connected to a bit, the negative pole of diode 4 is connected between resistance 3 and diode 6, positive pole is connected between binding post 2 and optocoupler 11, the negative pole of diode 8 is connected between resistance 3 and diode 6, and positive pole is connected between resistance 5 and relay 10, and electric capacity 7 and optocoupler 9 strong power part are connected in parallel.
Light current circuit, by DC power supply 1 (comprising port a1, port b1 and port c1) power supply, is made up of three branch circuit parallel connections, and the first branch road is connected to resistance 12, the weak current part of optocoupler 9 and the parallel connection part of resistance 13 and electric capacity 14 successively; Second branch road is connected to parallel connection part and the triode 19 of diode 17 and electric capacity 18 successively; 3rd branch road is connected to the weak current part of resistance 15 and optocoupler 11 successively.The port a3 of the binding post 16 of the output of the second testing circuit F, port b3, port c3 are connected with the input of the input of the weak current part of optocoupler 9, the base stage of triode 19, the weak current part of optocoupler 11 respectively.
The operation principle of the second testing circuit F is roughly described below:
Weak current part provides working power by DC power supply 1, and output is connected to microprocessor D.The binding post 2 of input connects 220V power supply, the binding post 16 of output be connected to microprocessor D.
When second testing circuit F does not work, namely do not detect and whether connect inverse time with or without ground wire and zero line live wire (LN), microprocessor D give the second testing circuit F binding post 16 port c3 sends out high level, b3 sends out low level, make the contact disconnection of optocoupler 11 conducting, relay 10, form normal LN loop.
When detecting with or without ground wire, microprocessor D give the binding post 16 of the second testing circuit F port c3 sends out low level, b3 sends out high level, to close by optocoupler 11, the closing of contact of relay 10, detected with or without ground wire by the level of detection port a3.If there is ground wire, AC220V forms loop by live wire L and ground wire and circulates, and make optocoupler 9 conducting, the port a3 of binding post 16 is high level, that is: indicate ground wire when the port a3 that microprocessor D detects binding post 16 is high level; If do not have ground wire, live wire L and ground wire can not form loop, and optocoupler 9 is closed, and the port a3 of binding post 16 is low level, that is: represent do not have ground wire when the port a3 that microprocessor D detects binding post 16 is low level.
Detect LN and whether connect inverse time, microprocessor D give the second testing circuit F binding post 16 port b3 sends out high level, port c3 sends out high level, by the closing of contact of optocoupler 11 conducting, relay 10, detect live wire and zero line by the level of detection port a3 anti-with or without connecing.If LN connects instead, AC220V forms loop by zero line and ground wire and circulates, then optocoupler 9 is closed, and the port a3 of binding post 16 is low level, that is: represent that LN connects instead when the port a3 that microprocessor D detects binding post 16 is low level; If LN does not connect instead, L, N and ground wire form loop, then optocoupler 9 conducting, the port a3 of binding post 16 is high level, that is: represent that LN does not connect instead when the port a3 that microprocessor D detects binding post 16 is high level.
Preferably, microprocessor D comprises: alarm unit, when being greater than pre-set current value for the electric current in ground wire, sends alarm signal; And memory cell, when being greater than pre-set current value for the electric current in ground wire, store alarms state information.
Adopt this preferred embodiment, when the electric current of alarm unit in ground wire of the microprocessor D of electrical equipment is greater than pre-set current value, send the alarm signal of leakage current fault, warning function can be played to the user near electrical equipment, pass through the memory cell of microprocessor D (alternatively simultaneously, this memory cell is memory chip) storage failure alarm state information, carry out troubleshooting for maintenance or maintenance personal.Carried out reporting to the police and failed storage before zero connection protection, when can prevent ground wire zero connection protection, microprocessor D power down resets and cannot report to the police or lose fault message.Because after ground wire connecting to neutral line, make current imbalance between N and the L in circuit, cause the residential power switch trip power-off having leakage switch, and then microprocessor D power down is reset; The fault-alarming state information that memory chip stores, only after fault clearance, by manual reset, just can delete alarm state information.Microprocessor D is after the information completing memory chip stores; perform ground wire zero connection protection immediately; namely high level is sent to drive circuit C; drive relay B adhesive; after the sound closing of contact of relay B, complete whole actions of the ground wire zero connection protection of electrical equipment, after electrical equipment completes the action of ground wire zero connection protection; the residential power switch trip power-off of leakage switch can be made, protection of cutting off the electricity supply in time.
Ground wire live protection circuit described above can be used in arbitrary electrical equipment; such as air conditioner etc.; access any one ground wire live protection circuit provided by the invention in air conditioner after; when the ground wire of air conditioner has leakage current fault or the outer machine of air conditioner due to exterior power supply electric leakage charged time; zero connection protection can be provided in time, solve the electrical shock safety accident caused because ground wire grounded resistance is excessive.
Next introduces the embodiment of earth wire charged protecting method.
Fig. 5 is the flow chart of the earth wire charged protecting method according to the embodiment of the present invention, and as shown in Figure 5, this earth wire charged protecting method comprises the steps that S102 is to step S106:
Step S102, detects the electric current in ground wire.
Preferably, before detecting the electric current in ground wire, earth wire charged protecting method also comprises: whether the zero line and the live wire that detect the electrical components of electrical equipment connect instead; And connect inverse time at the zero line of electrical components and live wire, send alarm signal, zero line and live wire can be avoided to connect instead, and then avoid ground wire to be connected with live wire.
Preferably, before detecting the electric current in ground wire, earth wire charged protecting method also comprises: the electrical components whether earth connection detecting electrical equipment; And when electrical components does not have earth connection, send alarm signal, if electrical components does not have earth connection, it is nonsensical for performing zero connection protection.
Step S104, judges whether the electric current in ground wire is greater than pre-set current value.This pre-set current value is generally set to the safety electric flow valuve of human body, also can set according to actual conditions.
Step S106, controls ground wire and is connected with zero line.
Preferably, before control ground wire is connected with zero line, earth wire charged protecting method also comprises: send alarm signal, can play warning function to the user near electrical equipment; And store alarms state information; troubleshooting is carried out for maintenance or maintenance personal; this information is only after fault clearance; pass through manual reset; just can delete; before zero connection protection, perform this step, the microprocessor power down due to electrical equipment after zero connection protection can be avoided to reset, alarm signal and can not store alarms state information can not be sent.
From above description, can find out, present invention achieves following technique effect: detect the electric current flowing through ground wire of electrical appliance in real time, when flowing through dangerous currents value in this ground wire, in time ground wire is connected with zero line, thus the security incident that human electric shock occurs can be avoided, solve because foreign current makes the electric shock problem that ground wire of electrical appliance is charged and make ground wire of electrical appliance charged because earth resistance is not up to standard and cause.
It should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a ground wire live protection circuit, is characterized in that, comprising:
First testing circuit (A), for detecting the electric current in described ground wire;
Relay (B), the first terminal connecting zero line, ground wire described in the second termination;
Drive circuit (C), is connected with the 3rd end of described relay (B), for driving described relay (B) adhesive; And
Microprocessor (D), be connected between described first testing circuit (A) and described drive circuit (C), whether the electric current for judging in described ground wire is greater than controls described drive circuit (C) when pre-set current value and the electric current in described ground wire are greater than described pre-set current value and drives described relay (B) adhesive to be connected with described zero line to make described ground wire.
2. ground wire live protection circuit according to claim 1, is characterized in that, also comprises:
Current transformer (E), is arranged on described ground wire, is connected with described first testing circuit (A).
3. ground wire live protection circuit according to claim 2, is characterized in that, described first testing circuit (A) comprising:
First binding post (01), comprises the first terminal and the second terminal, and wherein, described first testing circuit (A) is connected to described current transformer (E) via described the first terminal and described second connecting terminals;
Second binding post (02), comprises the 3rd terminal and the 4th terminal, and wherein, described first testing circuit (A) is connected to described microprocessor (D) via described 3rd terminal and described 4th connecting terminals;
Amplifying circuit (03), is connected between described the first terminal and described 3rd terminal;
First electric capacity (04), between the first end being connected to described the first terminal and described amplifying circuit (03);
Second electric capacity (05), first end is connected with the second end of described amplifying circuit (03);
First diode (06), positive pole is connected with the second end of described second electric capacity (05), and negative pole is connected to described 3rd terminal;
Second diode (07), positive pole is connected with described the first terminal, and negative pole is connected with described second terminal;
3rd diode (08), positive pole is connected with described second terminal, and negative pole is connected with described the first terminal;
And
3rd electric capacity (09), first end is connected to described 3rd terminal, and the second end and described second terminal and described 4th connecting terminals are connected together and ground connection.
4. ground wire live protection circuit according to claim 3, is characterized in that, described amplifying circuit (03) comprising:
Triode (031), grounded emitter;
First resistance (032), first end is connected to the base stage of described triode (031);
Second resistance (033), first end is connected to the second end of described first resistance (032); And
3rd resistance (034), first end is connected to the second end of described second resistance (033), and the second end of described 3rd resistance (034) is connected to the collector electrode of described triode (031),
Wherein, first node is provided with between described second resistance (033) and described first resistance (032), described first node is connected with described first electric capacity (04), Section Point is provided with between described second resistance (033) and described 3rd resistance (034), described Section Point connects DC power supply, between described 3rd resistance (034) and the collector electrode of described triode (031), be provided with the 3rd node, described 3rd node is connected with described second electric capacity (05).
5. ground wire live protection circuit according to claim 1, is characterized in that, also comprises:
Second testing circuit (F), be connected with described microprocessor (D), whether live wire and zero line for detecting electrical equipment connect instead, or whether electrical equipment connects ground wire, and the signal detected is sent to described microprocessor (D).
6. ground wire live protection circuit according to claim 1, is characterized in that, described microprocessor comprises:
Alarm unit, when being greater than described pre-set current value for the electric current in described ground wire, sends alarm signal;
And
Memory cell, when being greater than described pre-set current value for the electric current in described ground wire, store alarms state information.
7. an air conditioner, is characterized in that, comprises the ground wire live protection circuit according to any one of claim 1 to 6.
8. an earth wire charged protecting method, is characterized in that, comprising:
Detect the electric current in described ground wire;
Judge whether the electric current in described ground wire is greater than pre-set current value; And
When electric current in described ground wire is greater than described pre-set current value, controls described ground wire and be connected with zero line.
9. earth wire charged protecting method according to claim 8, is characterized in that, before detecting the electric current in described ground wire, described method also comprises:
Whether the zero line and the live wire that detect electrical equipment connect instead; And
Connect inverse time at the zero line of described electrical equipment and live wire, send alarm signal.
10. earth wire charged protecting method according to claim 8, is characterized in that, before detecting the electric current in described ground wire, described method also comprises:
Detect electrical equipment whether earth connection; And
When described electrical equipment does not have earth connection, send alarm signal.
11. earth wire charged protecting methods according to claim 8, is characterized in that, before the described ground wire of control is connected with zero line, described method also comprises:
Send alarm signal; And
Store alarms state information.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110227327.9A CN102931645B (en) | 2011-08-09 | 2011-08-09 | Ground wire live protection circuit and method and air conditioner with circuit |
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| CN201110227327.9A CN102931645B (en) | 2011-08-09 | 2011-08-09 | Ground wire live protection circuit and method and air conditioner with circuit |
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| CN102931645A CN102931645A (en) | 2013-02-13 |
| CN102931645B true CN102931645B (en) | 2016-03-30 |
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Families Citing this family (7)
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| CN105552832B (en) * | 2015-10-27 | 2018-10-26 | 东莞酷派软件技术有限公司 | A kind of earth leakage protective device, power supply adaptor and earth leakage protective method |
| CN106526426A (en) * | 2016-11-24 | 2017-03-22 | 云南电网有限责任公司电力科学研究院 | Power distribution network fault analyzing system and method |
| CN108695820A (en) * | 2018-07-21 | 2018-10-23 | 朱德锋 | Anti-reverse electrical ground protection system |
| CN110554271B (en) * | 2019-08-29 | 2022-01-21 | 格力电器（武汉）有限公司 | Air conditioner wiring detection device, test system and detection method |
| CN112066516B (en) * | 2020-08-03 | 2021-08-20 | 珠海格力电器股份有限公司 | Air conditioner, fault self-diagnosis method, external unit positioning fault method and remote controller |
| CN112952746A (en) * | 2021-01-27 | 2021-06-11 | 广东电网有限责任公司 | Electric shock protection device |
| CN113791269A (en) * | 2021-08-30 | 2021-12-14 | 深圳供电局有限公司 | Socket ground wire abnormity detection method and device and socket |
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| CN102931645A (en) | 2013-02-13 |
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