CN101281227B - Ground wire voltage and current detecting device - Google Patents
Ground wire voltage and current detecting device Download PDFInfo
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- CN101281227B CN101281227B CN2007101145737A CN200710114573A CN101281227B CN 101281227 B CN101281227 B CN 101281227B CN 2007101145737 A CN2007101145737 A CN 2007101145737A CN 200710114573 A CN200710114573 A CN 200710114573A CN 101281227 B CN101281227 B CN 101281227B
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Abstract
The present invention provides an earth wire voltage current detecting device, for testing whether voltage difference and the earth wire circular current formed by the voltage difference exist in the earth wires of a plurality of systems. Specifically, the present invention provides an earth wire voltage current detecting device, including a first probe, a second probe, a voltage measuring circuit, a current sensing circuit and an alarm circuit, wherein, the two terminals of the voltage measuring circuit are respectively connected with the first probe and the second probe for testing the voltage difference between the first probe and the second probe, when the voltage difference is larger than the preset voltage value, the alarm circuit sends out an over pressure alarm signal; the two terminals of the current sensing circuit are respectively connected with the first probe and the second probe for testing the current between the first probe and the second probe, when the current is larger than the preset voltage value, the alarm circuit sends out an over current alarm signal. The earth wire voltage current detecting device of the invention can conveniently test whether the voltage difference and the earth wire circular current exist in the earth wires of a plurality of systems, thereby avoiding other problems caused by the problem.
Description
Technical field
The present invention relates to a kind of pick-up unit, relate to a kind of device that is used to detect ground wire voltage and current more specifically.
Background technology
Along with the raising day by day of living standard, various electric equipments emerge in an endless stream, and may have multiple electrical equipment at user's family, and generally these electrical equipment all need to be connected with ground wire safety when work.Except the city electrical ground, user's family generally also exists other ground wire, for example CATV (cable television), cable network or the like.With the cable digital TV system is example, because the total system more complicated comprises that device interior ground connection, transmission signals ground connection, city wait numerous ground connection electrical ground, system earth is more complicated also.For a user, when there is voltage difference in the CATV (cable television) ground of family with 220V civil power ground, can form a ground wire circulation, family expenses cable digital TV equipment is worked the mischief; Perhaps because of numerous system earth reasons, ground wire circulation works the mischief to other domestic electric appliances, can have influence on people's the security of the lives and property.
In order to make the use household electrical appliance that the user can safety, this area is consulted and to be treated a kind ofly can conveniently detect the device whether a certain ground wire has voltage or electric current to exist with respect to 220V civil power ground, so that prevent the problem that may exist.
Summary of the invention
In order to address the above problem, the invention provides a kind of ground wire voltage and current detecting device, be used for detecting the ground wire the circulation whether ground wire of numerous system earths exists voltage difference and formed by voltage difference.Before domestic electric appliance installed, carry out safety detection when safeguarding, reach in advance the purpose of taking precautions against, preventing, ensure the normal operation of housed device.
Concrete, the invention provides a kind of ground wire voltage and current detecting device, comprise first probe and second probe, described ground wire voltage and current detecting device also comprises voltage detecting circuit, current detection circuit and warning circuit, the two ends of described voltage detecting circuit connect first probe and second probe respectively, be used to detect the voltage difference between first probe and second probe, when this voltage difference during greater than predefined magnitude of voltage, warning circuit sends the over voltage alarm signal; The two ends of described current detection circuit connect first probe and second probe respectively, are used to detect the electric current of first probe and second between popping one's head in, and when this electric current during greater than predefined current value, warning circuit sends the overcurrent alerting signal; Described voltage detecting circuit comprises first stabilivolt and second stabilivolt, described first stabilivolt connects described first probe on the one hand, be connected with the second stabilivolt differential concatenation on the other hand, the other end of second stabilivolt connects divided circuit on the one hand, an end that connects described warning circuit on the other hand, the other end of described warning circuit connects the other end of described divided circuit on the one hand, connects described second probe by first resistance on the other hand;
The two ends of described current detection circuit have at least an end to connect described first probe or second probe through a switch.
Above-mentioned predefined current value can comprise first current value and second current value, described overcurrent alerting signal comprises the first overcurrent alerting signal and the second overcurrent alerting signal, electric current between first probe and second probe is during greater than first current value, and described warning circuit sends the first overcurrent alerting signal; Electric current between first probe and second probe is during greater than second current value, and described warning circuit sends the second overcurrent alerting signal.
Above-mentioned current detection circuit comprises transformer and rectifier, the two ends of the one-level winding of described transformer connect described first probe and second probe, the two ends process rectifier of secondary winding connects the two ends of divided circuit on the one hand, connects the two ends of described warning circuit on the other hand.Described warning circuit comprises first warning circuit and second warning circuit, and described first warning circuit is composed in series by second light emitting diode and the 3rd resistance, and described second warning circuit is composed in series by first light emitting diode, the 3rd stabilivolt and second resistance.
Above-mentioned predefined magnitude of voltage can be 100V.
Ground wire voltage and current detecting device of the present invention can detect the ground wire circulation that whether has voltage difference and formed by voltage difference in the ground wire of numerous system earths easily; thereby avoided producing because of this problem causes other problems; protect domestic electric appliance, especially cable digital TV equipment carried out the safety detection protection, improved product usability, security and the life-span of domestic electric appliance.
Description of drawings
Figure 1 shows that a synoptic diagram of using the embodiment of ground wire voltage and current detecting device.
Figure 2 shows that the schematic diagram of the embodiment of a ground wire voltage and current detecting device.
Figure 3 shows that the circuit diagram of a kind of embodiment of ground wire voltage and current detecting device.
Embodiment
In order to make those skilled in the art person understand the present invention program better, and above-mentioned purpose of the present invention, feature and advantage can be become apparent more, be example with the cable digital TV system below, the present invention is further detailed explanation with embodiment in conjunction with the accompanying drawings.
Should there be voltage difference in the ideal case between 220V civil power ground and the CATV (cable television) ground, there is not electric current yet, yet, may has some voltage differences between 220V civil power ground and the CATV (cable television) ground owing to the multiple difference that exists between two systems, 0-5V for example, some in addition reach 12V.The existence of this point pressure reduction may be undesired to household electrical appliance (for example televisor) work that connects these two ground wires simultaneously, even some damages occur.In case and 220V civil power ground does not have normal ground connection, situations such as short circuit appear with 220V, then may make voltage difference between 220V civil power ground and the CATV (cable television) ground greater than 100V, these may the badly damaged household electrical appliance that connect 220V civil power and CATV (cable television) simultaneously, even can the user who use household electrical appliance be caused damage.
Voltage difference between 220V civil power ground and the CATV (cable television) ground and electric current are detected and can measure by all purpose instruments such as voltage table or reometers, but all purpose instrument has many-sided shortcoming, for example cost is higher, carries inconvenience etc.Figure 1 shows that the synoptic diagram of a kind of embodiment of ground wire voltage and current detecting device of the present invention, this ground wire voltage and current detecting device can detect voltage difference and electric current between 220V civil power ground and the CATV (cable television) ground simultaneously, and cost is lower and easy to carry.As shown in the figure, ground wire voltage and current detecting device 100 comprises probe 110 and probe 120.When needs are tested, only need probe 110 is linked to each other with CATV (cable television) ground respectively at 220V civil power ground with probe 120, ground wire voltage and current detecting device 100 just can be judged and whether has voltage difference between current 220V civil power ground and the CATV (cable television) ground or whether have electric current, and whether whether the voltage difference or the electric current that can indicate current existence can exert an influence to the household electrical appliance that connect in the above, when the voltage difference of current existence or electric current might damage household electrical appliance, ground wire voltage and current detecting device 100 can give the alarm.
Figure 2 shows that the schematic diagram of ground wire voltage and current detecting device 100.As shown in the figure, ground wire voltage and current detecting device 100 comprises probe 110, probe 120, voltage detecting circuit 130, current detection circuit 140 and warning circuit 150.Probe 110 is used to be connected 220V civil power ground and CATV (cable television) ground with probe 120, voltage detecting circuit 130 all is connected with probe 120 with probe 110 with current detection circuit 140, be used for test probe 110 and pop one's head in voltage difference and electric current between 120, when probe 110 and the voltage difference between 120 of popping one's head in during greater than a certain particular value, warning circuit 150 sends alerting signal.
Concrete, voltage detecting circuit 130 be mainly used in detection probe 110 and the voltage difference of popping one's head between 120 whether excessive: if voltage difference is excessive, for example greater than 100V, warning circuit 150 sends alerting signal, call user's attention, the ground wire danger close has voltage, need keep in repair the ground wire fault to connect household electrical appliance.If pop one's head in 110 and the voltage difference of popping one's head between 120 be lower than certain particular value, as 36V, then detect by 140 pairs of the current detection circuits probe 110 and the electric current of popping one's head between 120, if pop one's head in 110 and the electric current between 120 of popping one's head in greater than a certain particular value, 1A for example, warning circuit 150 sends alerting signal, call user's attention, between 220V civil power ground and the CATV (cable television) ground bigger electric current is arranged, can bring threat to household electrical appliance and user's safety, household electrical appliance just need exclude the electric current in the ground wire before installing, to guarantee the normal operation of household electrical appliance.Warning circuit 150 can the time pilot lamp, also can be hummer or the like.Like this, ground wire voltage and current detecting device 100 reminds between user current 220V civil power ground and the CATV (cable television) ground whether have voltage difference or the electric current that influences household electrical appliance by reporting to the police, and has guaranteed the safety of user when using or household electrical appliance are installed.
Figure 3 shows that the circuit diagram of a ground wire voltage and current detecting device.As shown in the figure, the probe 110 of ground wire voltage and current detecting device is connected 220V civil power ground and CATV (cable television) ground respectively with probe 120.
Stabilivolt VZ1, VZ2, VZ3, resistance R 2, R5 and light emitting diode VD6 form the loop of a voltage detecting, the two ends of loop connect probe 110 and probe 120, be used for to pop one's head in 110 and the voltage of popping one's head between 120 detect, resistance R 3 and capacitor C 2 are used for shunting.Wherein, stabilivolt VZ1, VZ2 differential concatenation connect, be used for the specific voltage value of voltage detecting circuit is determined, for example, when its pressure limiting amplitude can be for 100V, like this, when the voltage between stabilivolt VZ1, the VZ2 during greater than 100V, conducting is just understood in the loop of voltage detecting, and light emitting diode VD6 is luminous, and the voltage difference greater than 100V is arranged between prompting user 220V civil power ground and the CATV (cable television) ground.If the pressure limiting amplitude of stabilivolt VZ1, VZ2 reduces, 60V for example, like this, when voltage detecting circuit has greater than the voltage difference of 60V between 220V civil power ground and CATV (cable television) ground, light emitting diode VD6 will be luminous, and the voltage difference greater than 60V is arranged between prompting user 220V civil power ground and the CATV (cable television) ground.
Current detection circuit is made up of the loop that transformer L1, filtering circuit, rectification circuit, light emitting diode VD5, resistance R 2, R4 form.For fear of there being bigger voltage between 220V civil power ground and the CATV (cable television) ground; the protective current testing circuit; the ground wire voltage and current detecting device of this embodiment also comprises a K switch 1; have only the voltage detecting circuit of working as not detect when between 220V civil power ground and the CATV (cable television) ground bigger voltage difference being arranged; K switch 1 closure begins the electric current between 220V civil power ground and the CATV (cable television) ground is detected.If there is electric current to exist between 220V civil power ground and the CATV (cable television) ground, through after the electric current mutual inductance of L1, behind wave circuit and the rectification circuit, again through shunting, light emitting diode VD5 pilot lamp can be bright, shows to have electric current in the ground wire after filtration.If electric current is bigger, diode VD6 also can be luminous.Like this, current detection circuit just can detect between civil power ground and the CATV (cable television) ground whether have electric current, and the relative size of electric current.Generally speaking, only when light emitting diode VD5 is bright, electric current in the ground wire is sustainable, generally can not cause damage to household electrical appliance, in case and light emitting diode VD6 also lights, just may the household electrical appliance that be connected on the ground wire be caused damage, at this moment just need get rid of, to guarantee the normal operation of household electrical appliance the electric current in the ground wire.
Filtering circuit in the current detection circuit among the figure is a RC filtered electrical of being made up of resistance R 1 and C1, and rectification circuit is made up of diode VD1, VD2, VD3 and VD4, and circuit for alarming is made up of light emitting diode.Certainly, each ingredient in the foregoing circuit also can be substituted by other similar circuit, and for example circuit for alarming can use hummer to replace light emitting diode or the like.
Ground wire voltage and current detecting device of the present invention is simply effective; in the domestic electric appliance that makes, in the cable digital TV system; the ground wire circulation that the voltage difference that causes because of the complicacy of numerous earthed system ground connection forms; before electrical equipment is installed, obtained detection in advance when safeguarding; thereby avoided producing because of this problem causes other problems; protect domestic electric appliance, especially cable digital TV equipment carried out the safety detection protection; improved product usability, security and the life-span of domestic electric appliance, and provide actual help setter.
Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.
Claims (8)
1. ground wire voltage and current detecting device, comprise first probe and second probe, it is characterized in that: described ground wire voltage and current detecting device also comprises voltage detecting circuit, current detection circuit and warning circuit, the two ends of described voltage detecting circuit connect first probe and second probe respectively, be used to detect the voltage difference between first probe and second probe, when this voltage difference during greater than predefined magnitude of voltage, warning circuit sends the over voltage alarm signal; The two ends of described current detection circuit connect first probe and second probe respectively, are used to detect the electric current of first probe and second between popping one's head in, and when this electric current during greater than predefined current value, warning circuit sends the overcurrent alerting signal; Described voltage detecting circuit comprises first stabilivolt and second stabilivolt, described first stabilivolt connects described first probe on the one hand, be connected with the second stabilivolt differential concatenation on the other hand, the other end of second stabilivolt connects divided circuit on the one hand, an end that connects described warning circuit on the other hand, the other end of described warning circuit connects the other end of described divided circuit on the one hand, connects described second probe by first resistance on the other hand;
The two ends of described current detection circuit have at least an end to connect described first probe or second probe through a switch.
2. ground wire voltage and current detecting device according to claim 1, it is characterized in that: described predefined current value comprises first current value and second current value, described overcurrent alerting signal comprises the first overcurrent alerting signal and the second overcurrent alerting signal, electric current between first probe and second probe is during greater than first current value, and described warning circuit sends the first overcurrent alerting signal; Electric current between first probe and second probe is during greater than second current value, and described warning circuit sends the second overcurrent alerting signal.
3. ground wire voltage and current detecting device according to claim 2, it is characterized in that: described first current value is greater than second current value, electric current between first probe and second probe is during greater than first current value, and described warning circuit sends the first overcurrent alerting signal and the second overcurrent alerting signal simultaneously.
4. ground wire voltage and current detecting device according to claim 1 is characterized in that: described warning circuit is composed in series by first light emitting diode, the 3rd stabilivolt and second resistance.
5. ground wire voltage and current detecting device according to claim 1, it is characterized in that: described current detection circuit comprises transformer and rectifier, the two ends of the one-level winding of described transformer connect described first probe and second probe, the two ends process rectifier of secondary winding connects the two ends of divided circuit on the one hand, connects the two ends of described warning circuit on the other hand.
6. ground wire voltage and current detecting device according to claim 5, it is characterized in that: described warning circuit comprises first warning circuit and second warning circuit, described first warning circuit is composed in series by second light emitting diode and the 3rd resistance, and described second warning circuit is composed in series by first light emitting diode, the 3rd stabilivolt and second resistance.
7. ground wire voltage and current detecting device according to claim 5 is characterized in that: the secondary winding of described transformer connects described rectifier through a filtering circuit.
8. according to the arbitrary described ground wire voltage and current detecting device of claim 1-7, it is characterized in that: described predefined magnitude of voltage is 100V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101145737A CN101281227B (en) | 2007-12-29 | 2007-12-29 | Ground wire voltage and current detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101145737A CN101281227B (en) | 2007-12-29 | 2007-12-29 | Ground wire voltage and current detecting device |
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| Publication Number | Publication Date |
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| CN101281227A CN101281227A (en) | 2008-10-08 |
| CN101281227B true CN101281227B (en) | 2010-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101145737A Active CN101281227B (en) | 2007-12-29 | 2007-12-29 | Ground wire voltage and current detecting device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2970784B1 (en) * | 2011-01-26 | 2016-10-28 | Peugeot Citroen Automobiles Sa | DEVICE FOR DETECTING EARTH CONNECTION FAULT OF AN ELECTRICAL CONNECTOR SYSTEM |
| CN108287289B (en) * | 2017-01-10 | 2020-04-21 | 华为技术有限公司 | Common ground detection circuit and detection method thereof |
| CN113359058A (en) * | 2020-03-02 | 2021-09-07 | 中国电信股份有限公司 | Electric power facility leakage fault detection device and detection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4207517A (en) * | 1977-06-20 | 1980-06-10 | Bloxam James M | Switchless D.C. multifunction tester |
| CN86206596U (en) * | 1986-12-18 | 1987-09-12 | 许兆安 | Multipurpose voltage detector |
| CN2041427U (en) * | 1988-04-13 | 1989-07-19 | 张喜军 | Circuit detector for automobile |
| CN2433758Y (en) * | 2000-06-01 | 2001-06-06 | 丁云明 | Overcurrent protecter |
-
2007
- 2007-12-29 CN CN2007101145737A patent/CN101281227B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4207517A (en) * | 1977-06-20 | 1980-06-10 | Bloxam James M | Switchless D.C. multifunction tester |
| CN86206596U (en) * | 1986-12-18 | 1987-09-12 | 许兆安 | Multipurpose voltage detector |
| CN2041427U (en) * | 1988-04-13 | 1989-07-19 | 张喜军 | Circuit detector for automobile |
| CN2433758Y (en) * | 2000-06-01 | 2001-06-06 | 丁云明 | Overcurrent protecter |
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| CN101281227A (en) | 2008-10-08 |
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Address after: 266555 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee after: Hisense Visual Technology Co., Ltd. Address before: 266555 No. 151, Zhuzhou Road, Laoshan District, Shandong, Qingdao Patentee before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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Addressee: Wang Yanhui Document name: Notification of eligibility |
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