CN104155505A - Earth wire live detection device, air conditioner and electrical equipment - Google Patents

Earth wire live detection device, air conditioner and electrical equipment Download PDF

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Publication number
CN104155505A
CN104155505A CN201310178530.0A CN201310178530A CN104155505A CN 104155505 A CN104155505 A CN 104155505A CN 201310178530 A CN201310178530 A CN 201310178530A CN 104155505 A CN104155505 A CN 104155505A
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China
Prior art keywords
photoelectrical coupler
earth wire
electric
controller
input
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CN201310178530.0A
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Chinese (zh)
Inventor
王新
唐晓晖
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201310178530.0A priority Critical patent/CN104155505A/en
Publication of CN104155505A publication Critical patent/CN104155505A/en
Pending legal-status Critical Current

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Abstract

The invention discloses an earth wire live detection device. The earth wire live detection device includes a photoelectric coupler whose first input end is connected to an earth wire through a first resistor, second input end is connected to a null line through a second resistor, first output end is connected to a first direct current power supply through a third resistor, and second output end is connected to the ground through a fourth resistor; a controller whose voltage signal acquisition port is connected with the second output end of the photoelectric coupler, when the voltage of the second output end of the photoelectric coupler is larger than a threshold voltage, an alarm signal output port of the controller outputting an alarm signal; and an alarm device which is connected with the alarm signal output port of the controller and outputs a prompt in response to the alarm signal output by the controller. The earth wire live detection device disclosed by the invention sends out a prompt when electric leakage occurs in electrical equipment but no electric current flows through an earth wire, thereby improving safety of the electrical equipment, and reducing the probability of electric shock accidents of a user. At the same time, the invention also discloses an air conditioner and electrical equipment having the earth wire live detection device.

Description

A kind of earth wire charged testing device, air-conditioning and electric equipment
Technical field
The invention belongs to electric equipment safety protection technique field, relate in particular to a kind of earth wire charged testing device, air-conditioning and electric equipment.
Background technology
In real life; electric equipment (as air-conditioning, refrigerator, washing machine etc.) is to force ground connection; the ultimate principle of taking ground protection is the clamping action by stake resistance; the voltage-to-ground at electric leakage position is clamped down within the specific limits, avoided excessive and human body is damaged to the accident that even causes electric shock person's death to the electric current of the earth by human body.
At present; the ultimate principle of the holding circuit in electric equipment is: detect ground wire and whether have leakage current; when ground wire being detected and have leakage current, determine that electric equipment electric leakage occurs or has exterior power supply to cause the outer casing electrification of electric equipment, and then take safeguard measure.
But there is defect in the holding circuit in above-mentioned electric equipment: if ground wire breaks down; when ground wire electrification or electric equipment electric leakage; between electric equipment and the earth, cannot form leakage current; holding circuit is owing to leakage current not detected; safeguard measure can be do not taked, when user touches electric equipment, electric shock accidents can be caused.Therefore, the security how further to improve electric equipment, the probability that reduces generation electric shock accidents is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of earth wire charged testing device, to improve the security of electric equipment, thereby reduce the probability that electric shock accidents occurs user.
For achieving the above object, the invention provides following technical scheme:
The invention discloses a kind of earth wire charged testing device, be applied to electric equipment, comprising:
Photoelectrical coupler, the first input end of described photoelectrical coupler is connected to ground wire by the first resistance, the second input end of described photoelectrical coupler is connected to zero line by the second resistance, the first output terminal of described photoelectrical coupler is connected to the first direct supply by the 3rd resistance, and the second output terminal of described photoelectrical coupler is by the 4th resistance eutral grounding;
Controller, the voltage signal acquisition port of described controller is connected with the second output terminal of described photoelectrical coupler, when the voltage of the second output terminal of described photoelectrical coupler is greater than threshold voltage, the alarm signal output ends mouth output alarm signal of described controller;
Warning device, described warning device is connected with the alarm signal output ends mouth of described controller, responds the alerting signal output prompting of described controller output.
Preferably, above-mentioned earth wire charged testing device also comprises control circuit, and described control circuit comprises the first switching tube and the first relay;
The control end of described the first switching tube is connected to the control signal output port of described controller, and the first end of described the first switching tube is connected to the second direct supply by the main coil of described the first relay, the second end ground connection of described the first switching tube;
The auxiliary contact of described the first relay are connected between the first input end and described ground wire of described photoelectrical coupler, or are connected between second input end and described zero line of described photoelectrical coupler.
Preferably, above-mentioned earth wire charged testing device also comprises holding circuit;
The first end of described holding circuit is connected by electric loading with described electric equipment, and the second end of described holding circuit is connected with live wire, and the control end of described holding circuit is connected with the power-off signal output port of described controller.
Preferably, in above-mentioned earth wire charged testing device, described holding circuit comprises the second relay;
The main coil of described the second relay is connected with the power-off signal output port of described controller, one end of the auxiliary contact of described the second relay is connected by electric loading with described electric equipment, and the other end of the auxiliary contact of described the second relay is connected with described live wire.
Preferably, above-mentioned earth wire charged testing device also comprises the first diode and the second diode;
The anodic bonding of described the first diode is to described the first resistance, and the negative electrode of described the first diode is connected to the first input end of described photoelectrical coupler;
The anodic bonding of described the second diode is to the second input end of described photoelectrical coupler, and the negative electrode of described the second diode is connected to described zero line.
Preferably, above-mentioned earth wire charged testing device also comprises the first electric capacity and the second electric capacity;
The second output terminal of described photoelectrical coupler is by described the first capacity earth;
Described the second Capacitance parallel connection is between the first input end and the second input end of described photoelectrical coupler.
Preferably, above-mentioned earth wire charged testing device also comprises the 3rd diode and the 3rd electric capacity;
The anodic bonding of described the 3rd diode is to the first end of described the first switching tube, and the negative electrode of described the 3rd diode is connected to described the second direct supply;
Described the 3rd electric capacity and described the 3rd diodes in parallel.
Preferably, in above-mentioned earth wire charged testing device, the illuminator in described photoelectrical coupler is that light emitting diode, light-receiving device are phototriode;
The first input end of described photoelectrical coupler is the anode of described light emitting diode, the negative electrode that the second input end of described photoelectrical coupler is described light emitting diode, the collector that the first output terminal of described photoelectrical coupler is described phototriode, the emitter that the second output terminal of described photoelectrical coupler is described phototriode.
On the other hand, the invention also discloses a kind of air-conditioning, comprise indoor set, off-premises station and electric power system, wherein, described electric power system comprises above-mentioned any one earth wire charged testing device.
On the other hand, the invention also discloses a kind of electric equipment, described electric equipment comprises electric power system, and wherein, described electric power system comprises above-mentioned any one earth wire charged testing device.
As can be seen here, beneficial effect of the present invention is: earth wire charged testing device disclosed by the invention, utilize the electric current amplification of photoelectrical coupler, by second output terminal that is transformed into photoelectrical coupler of the voltage status linearity of ground wire, the voltage of the second output terminal and the voltage of ground wire of photoelectrical coupler are linear, controller is output alarm signal when the voltage of the second output terminal of photoelectrical coupler is greater than threshold voltage, warning device is exported prompting after receiving alerting signal, prevents user's false touch electric equipment.Compare with existing holding circuit,, there is electric leakage but ground wire also can send prompting while not having electric current to flow through at electric equipment in earth wire charged testing device disclosed by the invention, has improved the security of electric equipment, reduced the probability that electric shock accidents occurs user.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of the embodiment of the present invention one disclosed earth wire charged testing device;
Fig. 2 is the structural representation of the embodiment of the present invention two disclosed earth wire charged testing devices;
Fig. 3 is the structural representation of the embodiment of the present invention three disclosed earth wire charged testing devices;
Fig. 4 is the structural representation of the embodiment of the present invention four disclosed earth wire charged testing devices.
Embodiment
The invention discloses a kind of earth wire charged testing device, be applied in electric equipment, to improve the security of electric equipment, thereby reduce the probability that electric shock accidents occurs user.It should be noted that, in the present invention, the electric equipment of indication can be air-conditioning, refrigerator, washing machine etc.
Its technological thought is: earth wire charged testing device detects the voltage of ground wire in electric equipment, when the voltage of ground wire surpasses a certain threshold value, takes follow-up safeguard measure.When ground wire electrification or electric equipment electric leakage occurs may cause damage to user, even if ground wire breaks down, also can carry out in time security protection.
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment mono-
Referring to Fig. 1, Fig. 1 is the structural representation of the embodiment of the present invention one disclosed earth wire charged testing device.This earth wire charged testing device comprises photoelectrical coupler U1, controller 1 and warning device 2.
Wherein:
The first input end of photoelectrical coupler U1 is connected to ground wire PE by the first resistance R 1, and the second input end of photoelectrical coupler U1 is connected to zero line N by the second resistance R 2, and the first output terminal of photoelectrical coupler U1 is connected to the first direct supply V by the 3rd resistance R 3 cc1, the second output terminal of photoelectrical coupler U1 is by the 4th resistance R 4 ground connection.The first resistance R 1 and the second resistance R 2 are as current-limiting resistance, for photoelectrical coupler U1 is carried out to current-limiting protection and voltage-limiting protection.Photoelectrical coupler U1 isolates forceful electric power circuit and light current circuit, utilize the electric current amplification of photoelectrical coupler U1 self simultaneously, by second output terminal that is transformed into photoelectrical coupler U1 of the voltage condition linearity of ground wire PE, the voltage of the second output terminal of photoelectrical coupler U1 and the voltage of ground wire PE are linear.
The voltage signal acquisition port of controller 1 is connected with the second output terminal of photoelectrical coupler U1.When the voltage (the namely voltage of second output terminal of photoelectrical coupler U1) of controller 1 in its voltage signal acquisition port is greater than threshold voltage, generation alerting signal is also passed through the alarm signal output ends port transmission of self to external warning device 2.
Warning device 2 is connected with the alarm signal output ends mouth of controller 1, the alerting signal output prompting that warning device 2 response controllers 1 are exported when the voltage of the second output terminal of photoelectrical coupler U1 is greater than threshold voltage.In enforcement, warning device 2 can be emitting components or hummer, can be also both combinations.
Below the course of work of tape electric detection means is as shown in Figure 1 described:
If ground wire PE is not charged, the illuminator of photoelectrical coupler U1 is not luminous, now photoelectrical coupler U1 non-output signal.The voltage of the second output terminal of photoelectrical coupler U1 is dragged down, and the voltage of the voltage signal acquisition port of this Time Controller 1 is lower than threshold voltage, and controller 1 does not deal with.
If ground wire PE is charged, between ground wire PE and zero line N, there is voltage difference, this voltage difference drives the illuminator of photoelectrical coupler U1 luminous, now photoelectrical coupler U1 output current.The 3rd resistance R 3 and the 4th resistance R 4 form the first direct supply V cc1and the divider resistance between earth terminal, when the voltage (the namely voltage of the 4th resistance R 4 ungrounded ends) of the second output terminal of photoelectrical coupler U1 is greater than threshold voltage, controller 1 generates alerting signal, and by self alarm signal output ends port transmission to warning device 2.Warning device 2, after receiving the alerting signal of controller 1 output, responds this alerting signal output prompting.User, after being pointed out, no longer contacts electric equipment, but carries out subsequent treatment by specialized maintenance personnel, thereby avoids occurring user's electric shock accidents.
The disclosed earth wire charged testing device of the embodiment of the present invention one, utilize the electric current amplification of photoelectrical coupler U1, by second output terminal that is transformed into photoelectrical coupler U1 of the voltage status linearity of ground wire PE, the voltage of the second output terminal and the voltage of ground wire of photoelectrical coupler U1 are linear, controller 1 is output alarm signal when the voltage of the second output terminal of photoelectrical coupler U1 is greater than threshold voltage, warning device 2 is exported prompting after receiving alerting signal, prevents user's false touch electric equipment.Compare with existing holding circuit, there is electric leakage but ground wire also can send prompting while not having electric current to flow through at electric equipment in earth wire charged testing device disclosed by the invention, has improved the security of electric equipment, reduced the probability that electric shock accidents occurs user.
Conventionally accidental shock accident is to surpass 15mA because flow through the electric current of human body.Conventionally the human body resistance under state is 2000 Ω, in the situation that earth loop resistance is less than 1666.7 Ω, can think stake resistance and human body resistance approximately equal over the ground during human electric shock.By the characteristic of parallel circuit, the electric current of 30mA is divided into 15mA, and the electric current of 15mA is in man breaks away from scope (9~16mA).According to Ohm law, under the certain condition of voltage, loop current is decided by loop resistance, and this condition is at power supply capacity enough under large prerequisite.If power supply capacity is large not, the internal resistance of source is large, even if voltage is very high, for example, surpasses 50V, even surpasses civilian line voltage 220V, and its electric current that can provide does not reach 9mA yet, and in the case, the voltage that surpasses 50V can not constitute a threat to people.
In the present invention, the early warning voltage that controller 1 sends alerting signal is set to 150V, namely controller 1 sends alerting signal when the voltage of ground wire PE is greater than 150V, according to the voltage of the second output terminal of photoelectrical coupler U1 and the proportionate relationship between ground wire voltage, sets corresponding threshold voltage.
Embodiment bis-
Referring to Fig. 2, Fig. 2 is the structural representation of the embodiment of the present invention two disclosed earth wire charged testing devices.This earth wire charged testing device comprises photoelectrical coupler U1, controller 1, warning device 2 and control circuit 3.Only just describe with the difference part of embodiment mono-disclosed earth wire charged testing device.
Control circuit 3 comprises the first switching tube Q1 and the first relay K A1.The control end of the first switching tube Q1 is connected to the control signal output port of controller 1, and the first end of the first switching tube Q1 is connected to the second direct supply V by the main coil of the first relay K A1 cc2, the second end ground connection of the first switching tube Q1.The auxiliary contact of the first relay K A1 are connected between the first input end and the first resistance R 1 of photoelectrical coupler U1.
In tape electric detection means, be further provided with control circuit 3 as shown in Figure 2, can realizing the detection at times to electric equipment, for example, before electric equipment start or after shutdown, detecting.Detailed process is as follows:
When the control signal output port output low level of controller 1, the first switching tube Q1 turn-offs, now the main coil of the first relay K A1 must not be electric, its auxiliary contact are in off-state, between ground wire PE, photoelectrical coupler U1 and zero line N, do not form path, earth wire charged testing device does not carry out voltage detecting.
When the control signal output port output high level of controller 1, the first switching tube Q1 conducting, now the main coil of the first relay K A1 obtains electricly, and its auxiliary contact are in closure state, and earth wire charged testing device is devoted oneself to work.
The disclosed earth wire charged testing device of the embodiment of the present invention two, not only can there is electric leakage but ground wire sends prompting while not having electric current to flow through at electric equipment, improve the security of electric equipment, and control circuit is further set, to realize voltage detecting at times, when earth wire charged testing device does not carry out voltage detecting, its power consumption is similar to zero, has therefore reduced the power consumption of device.In addition, based on the disclosed earth wire charged testing device of embodiment bis-, can be only before electric equipment start and after shutdown, detect, thereby avoid the impact of daily ground wire surge, and the interference maloperation that in electric equipment, frequency converter PFC power supply causes work, improve the accuracy detecting.
It should be noted that, the auxiliary contact of the first relay K A1 can also be arranged between the first resistance R 1 and ground wire PE, and namely the auxiliary contact of the first relay K A1 can be series between the first input end and ground wire PE of photoelectrical coupler U1.
Certainly, the auxiliary contact of the first relay K A1 also can be connected between the second input end and zero line of photoelectrical coupler U1, as long as the auxiliary contact of the first relay K A1 can cut off the path between first input end, the second input end and the zero line N of ground wire PE, photoelectrical coupler U1 when off-state.
Embodiment tri-
Referring to Fig. 3, Fig. 3 is the structural representation of the embodiment of the present invention three disclosed earth wire charged testing devices.This earth wire charged testing device comprises photoelectrical coupler U1, controller 1, warning device 2, control circuit 3 and holding circuit 4.Only just describe with the difference part of embodiment bis-disclosed earth wire charged testing devices.
The first end of holding circuit 4 is connected with the use electric loading 5 of electric equipment, and the second end of holding circuit 4 is connected with live wire L, and the control end of holding circuit 4 is connected with the power-off signal output port of controller 1.When controller 1 determines that the voltage of the second output terminal of photoelectrical coupler U1 is greater than threshold voltage; by its power-off signal output port, export power-off signal to holding circuit 4; with control protection electric circuit 4, disconnect live wire L and with the connection between electric loading 5, close electric equipment.
The ground wire electrification of electric equipment, may cause by outer incoming call, may be also that electric equipment electric leakage causes.If cause the ground wire electrification of electric equipment because electric equipment leaks electricity, based on embodiment mono-and the disclosed earth wire charged testing device of embodiment bis-, although can send prompting to user, thereby avoid user that electric shock accidents occurs, but now electric equipment still moves under electric leakage state, still there is certain hidden danger.Based on the disclosed earth wire charged testing device of the embodiment of the present invention three, when determining that the voltage of the ground wire of electric equipment is greater than early warning voltage, not only to user, send prompting, can also cut off the use electric loading of electric equipment and the connection between live wire L, thereby close down electric equipment, avoid electric equipment to move under electric leakage state, eliminate safe hidden trouble.
In enforcement, holding circuit 4 can adopt various structures.
For example: holding circuit 4 comprises the second relay; the main coil of the second relay is connected with the power-off signal output port of controller 1; one end of the auxiliary contact of the second relay is connected with the use electric loading 5 of electric equipment, and the other end of the auxiliary contact of the second relay is connected with live wire L.
Or holding circuit 4 comprises insulated gate bipolar transistor (IGBT), the gate pole of IGBT is connected with the power-off signal output port of controller 1, and the source electrode of IGBT is connected with the use electric loading 5 of electric equipment, and the drain electrode of IGBT is connected with live wire L.
Certainly, for the larger electric equipment of rated power, holding circuit 4 can also adopt the 3rd relay and A.C. contactor to form.Concrete: the main coil of the 3rd relay is connected with the power-off signal output port of controller 1, the main coil of A.C. contactor is connected to the 3rd direct supply by the auxiliary contact of the 3rd relay, one end of the auxiliary contact of A.C. contactor is connected with the use electric loading 5 of electric equipment, and the other end of the auxiliary contact of A.C. contactor is connected with live wire L.
In the embodiment of the present invention one to embodiment tri-disclosed earth wire charged testing device, the first diode and the second diode can be further set, wherein, anodic bonding to the first resistance of the first diode, the negative electrode of the first diode is connected to the first input end of photoelectrical coupler, the anodic bonding of the second diode is to the second input end of photoelectrical coupler, and the negative electrode of the second diode is connected to zero line.Preferably, the first electric capacity and the second electric capacity can also be further set, the second output terminal of photoelectrical coupler is by the first capacity earth, and the second Capacitance parallel connection is between the first input end and the second input end of photoelectrical coupler.
In the embodiment of the present invention two and the disclosed earth wire charged testing device of embodiment tri-, the 3rd diode and the 3rd electric capacity can be further set, the first end of anodic bonding to the first switching tube of the 3rd diode, the negative electrode of the 3rd diode is connected to the second direct supply, the 3rd electric capacity and the 3rd diodes in parallel.
Below in conjunction with embodiment tetra-, describe.
Embodiment tetra-
Referring to Fig. 4, Fig. 4 is the structural representation of the embodiment of the present invention four disclosed earth wire charged testing devices.This earth wire charged testing device comprises photoelectrical coupler U1, controller 1, warning device 2, control circuit 3 and holding circuit 4.
Wherein:
The first input end of photoelectrical coupler U1 is connected to the negative electrode of the first diode D1, the anode of the first diode D1 is connected to ground wire PE by auxiliary contact and the first resistance R 1 of the first relay K A1 successively, the second input end of photoelectrical coupler U1 is connected to the anode of the second diode D2, the negative electrode of the second diode D2 is connected to zero line N by the second resistance R 2, and the first output terminal of photoelectrical coupler U1 is connected to the first direct supply V by the 3rd resistance R 3 cc1, the second output terminal of photoelectrical coupler U1 is by the 4th resistance R 4 ground connection.Meanwhile, the second output terminal of photoelectrical coupler U1 is by the first capacitor C 1 ground connection, between the first input end of photoelectrical coupler U1 and the second input end, connects the second capacitor C 2.The first diode D1 and the second diode D2, for half-wave rectification, improve the reliability of photoelectrical coupler U1.The first capacitor C 1, for filtering clutter signal, prevents that the voltage signal acquisition port processing of controller 1 from judging by accident to noise signal.The second capacitor C 2 plays filter action, the electric current of the photoelectrical coupler U1 that guarantees to flow through stable, thus guarantee the stable of voltage in the 4th resistance R 4.
Control circuit 3 comprises the first switching tube Q1 and the first relay K A1.The control end of the first switching tube Q1 is connected to the control signal output port of controller 1, and the first end of the first switching tube Q1 is connected to the second direct supply V by the main coil of the first relay K A1 cc2, the second end ground connection of the first switching tube Q1.The auxiliary contact of the first relay K A1 are connected between the first input end and the first resistance R 1 of photoelectrical coupler U1.The first end of anodic bonding to the first switching tube Q1 of the 3rd diode D3, the negative electrode of the 3rd diode D3 is connected to the second direct supply V cc2, the 3rd diode D3, for consume the back electromotive force of the first relay K A1 main coil when power-off, removes the left magnetic effect of the first relay K A1 main coil, thus protection the first relay K A1.The 3rd capacitor C 3 is in parallel with the 3rd diode D3.
The voltage signal acquisition port of controller 1 is connected with the second output terminal of photoelectrical coupler U1; the alarm signal output ends mouth of controller 1 is connected with warning device 2; the control signal output port of controller 1 is connected with the control end of the first switching tube Q1 in control circuit 3, and the power-off signal output port of controller 1 is connected with the control end of holding circuit 4.
When the control signal output port of controller 1 is exported high level, earth wire charged testing device is devoted oneself to work.When controller 1 determines that the voltage of the second output terminal of photoelectrical coupler U1 is greater than threshold voltage; transmission alerting signal is to warning device 2; transmission power-off signal is to holding circuit 4; warning device 2 response alerting signal output promptings afterwards, holding circuit 4 response power-off signals cut off with the connection between electric loading 5 and live wire L.
In the embodiment of the present invention two to embodiment tetra-, the first switching tube Q1 can adopt triode or field effect transistor.When the first switching tube Q1 adopts triode, first end is collector, and the second end is emitter, and control end is base stage.When the first switching tube Q1 adopts field effect transistor, first end is drain electrode, and the second end is source electrode, and control end is grid.
In the various embodiments described above of the present invention, photoelectrical coupler U1 can adopt various structures.
For example: the illuminator in photoelectrical coupler U1 is that light emitting diode, light-receiving device are phototriode.Now, the first input end of photoelectrical coupler U1 is the anode of light emitting diode, the negative electrode that the second input end of photoelectrical coupler U1 is light emitting diode, the collector that the first output terminal of photoelectrical coupler U1 is phototriode, the emitter that the second output terminal of photoelectrical coupler U1 is phototriode.
Or the illuminator in photoelectrical coupler U1 is that light emitting diode, light-receiving device are photodiode.Now, the first input end of photoelectrical coupler U1 is the anode of light emitting diode, the negative electrode that the second input end of photoelectrical coupler U1 is light emitting diode, the anode that the first output terminal of photoelectrical coupler U1 is photodiode, the negative electrode that the second output terminal of photoelectrical coupler U1 is photodiode.
In addition, earth wire charged testing device disclosed by the invention can also judge whether the zero line of electric equipment and live wire connect instead, and detailed process is as follows:
When power supply source provides ground wire, and in the situation that impedance loop meets the demands, if the zero line N of electric equipment and live wire L connect instead, two of earth wire charged testing device so disclosed by the invention sampling input ends became and were connected to ground wire PE and live wire L from being originally connected to ground wire PE and zero line N.Because the voltage difference between ground wire PE and live wire L is greater than 150V, this voltage difference drives the illuminator of photoelectrical coupler U1 luminous, makes photoelectrical coupler U1 output current.The divider resistance that the 3rd resistance R 3 and the 4th resistance R 4 form between the first direct supply Vcc1 and earth terminal, now the voltage of the second output terminal of photoelectrical coupler U1 (the namely voltage of the 4th resistance R 4 ungrounded ends) is greater than threshold voltage, controller 1 generates alerting signal, and by self alarm signal output ends port transmission to warning device 2.Warning device 2, after receiving the alerting signal of controller 1 output, responds this alerting signal output prompting.
The present invention also discloses a kind of air-conditioning, and this air-conditioning comprises indoor set, off-premises station and electric power system, and wherein, electric power system comprises above-mentioned disclosed any one earth wire charged testing device of the present invention., can there is electric leakage but ground wire sends prompting while not having electric current to flow through at air-conditioning in air-conditioning disclosed by the invention, improved the security of air-conditioning, reduced the probability that electric shock accidents occurs user.
In addition, the present invention also discloses a kind of electric equipment, and this electric equipment comprises electric power system, is provided with above-mentioned disclosed any one earth wire charged testing device of the present invention in electric power system., can there is electric leakage but ground wire sends prompting while not having electric current to flow through in electric equipment disclosed by the invention, improved the security of electric equipment, reduced the probability that electric shock accidents occurs user.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and each embodiment stresses is the difference with other embodiment, between each embodiment identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.

Claims (10)

1. an earth wire charged testing device, is applied to electric equipment, it is characterized in that, comprising:
Photoelectrical coupler, the first input end of described photoelectrical coupler is connected to ground wire by the first resistance, the second input end of described photoelectrical coupler is connected to zero line by the second resistance, the first output terminal of described photoelectrical coupler is connected to the first direct supply by the 3rd resistance, and the second output terminal of described photoelectrical coupler is by the 4th resistance eutral grounding;
Controller, the voltage signal acquisition port of described controller is connected with the second output terminal of described photoelectrical coupler, when the voltage of the second output terminal of described photoelectrical coupler is greater than threshold voltage, the alarm signal output ends mouth output alarm signal of described controller;
Warning device, described warning device is connected with the alarm signal output ends mouth of described controller, responds the alerting signal output prompting of described controller output.
2. earth wire charged testing device according to claim 1, is characterized in that, also comprises control circuit, and described control circuit comprises the first switching tube and the first relay;
The control end of described the first switching tube is connected to the control signal output port of described controller, and the first end of described the first switching tube is connected to the second direct supply by the main coil of described the first relay, the second end ground connection of described the first switching tube;
The auxiliary contact of described the first relay are connected between the first input end and described ground wire of described photoelectrical coupler, or are connected between second input end and described zero line of described photoelectrical coupler.
3. earth wire charged testing device according to claim 2, is characterized in that, also comprises holding circuit;
The first end of described holding circuit is connected by electric loading with described electric equipment, and the second end of described holding circuit is connected with live wire, and the control end of described holding circuit is connected with the power-off signal output port of described controller.
4. earth wire charged testing device according to claim 3, is characterized in that, described holding circuit comprises the second relay;
The main coil of described the second relay is connected with the power-off signal output port of described controller, one end of the auxiliary contact of described the second relay is connected by electric loading with described electric equipment, and the other end of the auxiliary contact of described the second relay is connected with described live wire.
5. earth wire charged testing device according to claim 4, is characterized in that, also comprises the first diode and the second diode;
The anodic bonding of described the first diode is to described the first resistance, and the negative electrode of described the first diode is connected to the first input end of described photoelectrical coupler;
The anodic bonding of described the second diode is to the second input end of described photoelectrical coupler, and the negative electrode of described the second diode is connected to described zero line.
6. earth wire charged testing device according to claim 5, is characterized in that, also comprises the first electric capacity and the second electric capacity;
The second output terminal of described photoelectrical coupler is by described the first capacity earth;
Described the second Capacitance parallel connection is between the first input end and the second input end of described photoelectrical coupler.
7. earth wire charged testing device according to claim 6, is characterized in that, also comprises the 3rd diode and the 3rd electric capacity;
The anodic bonding of described the 3rd diode is to the first end of described the first switching tube, and the negative electrode of described the 3rd diode is connected to described the second direct supply;
Described the 3rd electric capacity and described the 3rd diodes in parallel.
8. according to the earth wire charged testing device described in claim 1 to 7, it is characterized in that, the illuminator in described photoelectrical coupler is that light emitting diode, light-receiving device are phototriode;
The first input end of described photoelectrical coupler is the anode of described light emitting diode, the negative electrode that the second input end of described photoelectrical coupler is described light emitting diode, the collector that the first output terminal of described photoelectrical coupler is described phototriode, the emitter that the second output terminal of described photoelectrical coupler is described phototriode.
9. an air-conditioning, comprises indoor set, off-premises station and electric power system, it is characterized in that, described electric power system comprises the earth wire charged testing device as described in any one in claim 1 to 8.
10. an electric equipment, described electric equipment comprises electric power system, it is characterized in that, described electric power system comprises the earth wire charged testing device as described in any one in claim 1 to 8.
CN201310178530.0A 2013-05-14 2013-05-14 Earth wire live detection device, air conditioner and electrical equipment Pending CN104155505A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105116205A (en) * 2015-07-30 2015-12-02 青岛海尔科技有限公司 Apparatus detecting whether casing of home appliance is electrified or not
CN106602500A (en) * 2017-01-04 2017-04-26 郝珊 Novel protection grounding live-line alarm and protection circuit
CN107525959A (en) * 2017-08-23 2017-12-29 海南电网有限责任公司琼海供电局 Electrification detection system
CN108183462A (en) * 2017-12-14 2018-06-19 珠海格力电器股份有限公司 For the electric protective device and electrical equipment of electrical equipment
CN109245042A (en) * 2018-10-31 2019-01-18 深圳市麦斯杰网络有限公司 Electric leakage detecting and warning device
CN110779145A (en) * 2019-11-08 2020-02-11 宁波奥克斯电气股份有限公司 Protection control method and system for air conditioner wiring and air conditioner

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105116205A (en) * 2015-07-30 2015-12-02 青岛海尔科技有限公司 Apparatus detecting whether casing of home appliance is electrified or not
CN106602500A (en) * 2017-01-04 2017-04-26 郝珊 Novel protection grounding live-line alarm and protection circuit
CN107525959A (en) * 2017-08-23 2017-12-29 海南电网有限责任公司琼海供电局 Electrification detection system
CN108183462A (en) * 2017-12-14 2018-06-19 珠海格力电器股份有限公司 For the electric protective device and electrical equipment of electrical equipment
CN109245042A (en) * 2018-10-31 2019-01-18 深圳市麦斯杰网络有限公司 Electric leakage detecting and warning device
CN110779145A (en) * 2019-11-08 2020-02-11 宁波奥克斯电气股份有限公司 Protection control method and system for air conditioner wiring and air conditioner

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