CN103792444B - Direct-current remote feeding power input grounding testing circuit and detection method thereof - Google Patents
Direct-current remote feeding power input grounding testing circuit and detection method thereof Download PDFInfo
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- CN103792444B CN103792444B CN201310379945.4A CN201310379945A CN103792444B CN 103792444 B CN103792444 B CN 103792444B CN 201310379945 A CN201310379945 A CN 201310379945A CN 103792444 B CN103792444 B CN 103792444B
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Abstract
The invention discloses a kind of direct-current remote feeding power input grounding testing circuit and detection method thereof, this circuit includes inputting resistance to earth sampling module, input grounding mode determination module, input grounding alarm report module and MCU control module；Input resistance to earth sampling module electrically connects with input grounding mode determination module, and input grounding mode determination module is electrically connected with MCU control module by input grounding alarm report module.The circuit that the present invention provides make use of the feature of 48V input grounding, resistance is used to provide ground voltage sampling circuit, logical analysis and judgement is carried out by different earthing modes, distinguish the earthing mode that input is different, reach input grounding detection and the purpose of fault warning, thus realize the bad alarm of input grounding and report, improve the safety and reliability that this power supply uses, and the method simple, provide the biggest benefit to DC remote power supply application reliability.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of direct-current remote feeding power input grounding testing circuit and detection thereof
Method.
Background technology
Communication in China cause has had development at full speed in recent years, and communication power supply is the infrastructure of whole communication network, is
The guarantee that whole communication telecommunications network normal reliable is run, along with the universal of 3G network and development, its mobile base station, EPON and indoor
The power supply of outer computer room construction, connect electricity problem and all have direct-current remote feeding power circuit to complete.The ground connection of direct-current remote feeding power circuit is
Critically important, because residual current protection and the AC overlap joint protection of defined are both for the earth PE and export with power supply in industry standard
Loop that both positive and negative polarity is constituted judges and realizes.The ground connection property detection of Remote Power Supply circuit at present is typically with ground connection
On screw, patch must the mark of reliable ground be reminded.This measure can not be stopped workmen and be forgotten ground connection because of carelessness
Situation, bring great hidden danger to the safety and reliability of power circuit.
Summary of the invention
For weak point present in above-mentioned technology, the present invention provides a kind of direct-current remote feeding power input grounding detection
Circuit and detection method thereof, input different earthing modes to DC remote power supply circuit and judge, thus realize input grounding not
The alarm report of good fault, improves the safety and reliability of the use of this power supply.
For achieving the above object, the present invention provides a kind of direct-current remote feeding power input grounding testing circuit, including input
Resistance to earth sampling module, input grounding mode determination module, input grounding alarm report module and MCU control module；Institute
Stating input resistance to earth sampling module to electrically connect with input grounding mode determination module, described input grounding mode determination module leads to
Cross input grounding alarm report module to electrically connect with MCU control module.
Wherein, described input resistance to earth sampling module include the first diode, the second diode, the first electric capacity, second
Electric capacity and six resistance；Direct current input main track is electrically connected to the one or two pole after passing sequentially through the first resistance of series connection and the second resistance
The negative pole of the first diode, one end of described first electric capacity it is electrically connected to after the positive pole of pipe, the 3rd resistance and the first electric capacity parallel connection
Being electrically connected to input grounding mode determination module, direct current input negative wire passes sequentially through electricity after the 4th resistance of series connection and the 5th resistance
The positive pole of the second diode it is electrically connected to after being connected to the negative pole of the second diode, the 3rd resistance and the second electric capacity parallel connection, described
One end of second electric capacity is electrically connected to input grounding mode determination module, and the other end of described first electric capacity and the second electric capacity is equal
Being electrically connected to connect protection ground wire, the voltage of described direct current input main track and direct current input negative wire is 48V.
Wherein, described input grounding mode determination module includes the first amplifier comparator, the second amplifier comparator, first steady
Pressure diode, the second Zener diode, the 3rd Zener diode and the 4th Zener diode；The of described first amplifier comparator
Three pins are electrically connected by the first sampled voltage of the 7th resistance and the 3rd resistance, the second pin of described first amplifier comparator
Being electrically connected to connect protection ground wire by the 8th resistance, described 7th resistance is by being electrically connected after the 9th resistance connected and the tenth resistance
Be connected to the negative pole of the first Zener diode, the first pin of described first amplifier comparator connect respectively the first Zener diode and
The positive pole of the second Zener diode, the negative electricity of described second Zener diode is connected to input grounding alarm report module；
3rd pin of described second amplifier comparator is electrically connected by the second sampled voltage of the 11st resistance and the 6th resistance, described
Second pin of the second amplifier comparator is electrically connected to connect protection ground wire by the 12nd resistance, and described 11st resistance is by string
The negative pole of the 3rd Zener diode it is electrically connected to after 13rd resistance of connection and the 14th resistance, described second amplifier comparator
First pin connects the 3rd Zener diode and the positive pole of the 4th Zener diode, the negative pole of described 4th Zener diode respectively
It is electrically connected to input grounding alarm report module.
For achieving the above object, the present invention provides also a kind of direct-current remote feeding power input grounding detection method, including with
Lower step:
Step A: direct current input negative wire is carried out voltage sample and obtains the first sampled voltage, carries out electricity to direct current input main track
Pressure sampling obtains the second sampled voltage, and to input grounding mode, the first sampled voltage and the transmission of the second sampled voltage are judged mould
Block；
Step B: the first sampled voltage is compared by the first amplifier comparator in input grounding mode determination module, defeated
Second sampled voltage is compared by the second amplifier comparator entered in earthing mode determination module, and obtains comparative result；
Step C: comparative result is inputed to MCU control module by input grounding alarm report module, by MCU control
According to comparative result, module judges whether the input grounding of power supply breaks down.
The invention has the beneficial effects as follows: compared with prior art, the direct-current remote feeding power input grounding that the present invention provides
Testing circuit and detection method thereof, this circuit includes inputting resistance to earth sampling module, input grounding mode determination module, input
Ground connection property alarm report module and MCU control module, input resistance to earth sampling module carries out voltage to direct current input main track and adopts
Sample obtains the second sampled voltage, and sends the first sampled voltage and the second sampled voltage to input grounding mode determination module,
The comparison to two sampled voltages by the first amplifier comparator and the second amplifier comparator, by MCU control module according to comparing
Result judges whether the input grounding of power supply breaks down, the ground connection that MCU control module is different to the input of DC remote power supply circuit
Mode judges, distinguishes the earthing mode that input is different, reaches to detect input grounding and the purpose of fault warning, from
And realize the bad alarm of input grounding and report, improve the safety and reliability of the use of this power supply.
Accompanying drawing explanation
Fig. 1 is the fundamental diagram of the direct-current remote feeding power input grounding testing circuit of the present invention；
Fig. 2 is the fundamental diagram of the direct-current remote feeding power input grounding detection method of the present invention.
Main element symbol description is as follows:
10, input resistance to earth sampling module 11, input grounding mode determination module
12, input grounding alarm report module 13, MCU control module
Detailed description of the invention
In order to more clearly state the present invention, below in conjunction with the accompanying drawings the present invention is further described.
Referring to Fig. 1, the direct-current remote feeding power input grounding testing circuit that the present invention provides, including input resistance to earth
Sampling module 10, input grounding mode determination module 11, input grounding alarm report module 12 and MCU control module 13；Defeated
Entering resistance to earth sampling module 10 to electrically connect with input grounding mode determination module 11, input grounding mode determination module 11 passes through
Input grounding alarm report module 12 electrically connects with MCU control module 13.Input resistance to earth sampling module 10 includes first
Diode D1, the second diode D2, the first electric capacity C1, the second electric capacity C2, the first resistance R1, the second resistance R2, the 3rd resistance R3,
4th resistance R4, the 5th resistance R5 and the 6th resistance R6；Direct current input main track 48VIN+ passes sequentially through the first resistance R1 of series connection
Be electrically connected to the positive pole of the first diode after the second resistance R2, be electrically connected to the one or two after the 3rd resistance and the first electric capacity parallel connection
The negative pole of pole pipe D1, one end of the first electric capacity C1 is electrically connected to input grounding mode determination module 11, direct current input negative wire
48VIN-is electrically connected to the negative pole of the second diode D2, the 3rd electricity after passing sequentially through the 4th resistance R4 and the 5th resistance R5 of series connection
Being electrically connected to the positive pole of the second diode D2 after resistance R3 and the second electric capacity C2 parallel connection, one end of the second electric capacity C2 is electrically connected to input
Earthing mode determination module 11, and the other end of the first electric capacity C1 and the second electric capacity C2 is electrically connected to connect protection ground wire PE, directly
The voltage of stream input main track 48VIN+ and direct current input negative wire 48VIN-is 48V.Input grounding mode determination module 11 includes
First amplifier comparator U1, the second amplifier comparator U2, the first Zener diode D3, the second Zener diode D4, the 3rd voltage stabilizing
Diode D5 and the 4th Zener diode D6；3rd pin of the first amplifier comparator U1 passes through the 7th resistance R7 and the 3rd resistance
The first sampled voltage VIN1 electrical connection of R3, second pin of the first amplifier comparator U1 is electrically connected to connect by the 8th resistance R8
Protection ground wire PE, the 7th resistance R7 are by being electrically connected to the first voltage stabilizing two pole after the 9th resistance R9 and the tenth resistance R10 of series connection
The negative pole of pipe D3, first pin of the first amplifier comparator U1 connects the first Zener diode D3 and the second Zener diode respectively
The positive pole of D4, the negative electricity of the second Zener diode D4 is connected to input grounding alarm report module 12；Second amplifier compares
3rd pin of device U2 is electrically connected by the second sampled voltage VIN-of the 11st resistance R11 and the 6th resistance R6, the second amplifier
Second pin of comparator U2 is electrically connected to meet protection ground wire PE, the 11st resistance R11 by series connection by the 12nd resistance R12
The 13rd resistance R13 and the 14th resistance R14 after be electrically connected to the negative pole of the 3rd Zener diode D5, the second amplifier comparator
First pin of U2 connects the 3rd Zener diode D5 and the positive pole of the 4th Zener diode D6, the 4th Zener diode D6 respectively
Negative electricity be connected to input grounding alarm report module 12.
Further referring to Fig. 2, the present invention provides a kind of direct-current remote feeding power input grounding detection method, the method
Including below scheme
Step S1: direct current input negative wire is carried out voltage sample and obtains the first sampled voltage, is carried out direct current input main track
Voltage sample obtains the second sampled voltage, and the first sampled voltage and the transmission of the second sampled voltage is judged to input grounding mode
Module；
Step S2: the first sampled voltage is compared by the first amplifier comparator in input grounding mode determination module,
Second sampled voltage is compared by the second amplifier comparator in input grounding mode determination module, and obtains comparative result；
Step S3: comparative result is inputed to MCU control module by input grounding alarm report module, MCU controls
According to comparative result, molding tuber judges whether the input grounding of power supply breaks down.If the logic in MCU control module is sentenced
Disconnected result is 10, then can report the information of the direct current input negative wire ground connection of power supply, if the logical judgment knot in MCU control module
Fruit is 01, then can report the information of the direct current input main track ground connection of power supply；If the logical judgment result in MCU control module is
11, then can go up the fault warning information that telegraph circuit input grounding is bad.
During above-mentioned, including three kinds of mode of operations:
The first mode of operation: when direct current input main track 48VIN+ with connect protection ground wire PE reliably electrically connect time, the one or two
Pole pipe D1, the second diode D2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and
6th resistance R6 constitutes the sampling circuit to input resistance to earth sampling module 10, and the 3rd resistance R3 and the 6th resistance R6 is sampling
Resistance, owing to the first sampled voltage VIN1 on the 3rd resistance R3 is 0V, and the second sampled voltage VIN2 on the 6th resistance R6
For 48V*R6/ (R6+R5+R4), this refers to the resistance of each resistance；And VIN1 Yu VIN2 can judge mould in input grounding mode
Comparing with threshold voltage in block 11, owing to the first sampled voltage is less than threshold voltage, and the second sampled voltage is more than thresholding
Voltage, thereby results in the first amplifier comparator U1 and is output as low level, and the second amplifier comparator U2 is output as high level, and circuit will
This second compares output signal and inputs to MCU control module 13, MCU control module by input grounding alarm report module 12
13 to carry out logical judgment be 01, then can report the information of the direct current input main track ground connection of power supply.
Mode of operation two: when direct current input negative wire 48VIN-with connect protection ground wire PE reliably electrically connect time, the first diode
D1, the second diode D2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the 6th
Resistance R6 constitutes the sampling circuit to input resistance to earth sampling module 10, and the 3rd resistance R3 and the 6th resistance R6 is sampling electricity
Resistance, owing to the second sampled voltage VIN2 on the 6th resistance R6 is 0V, and the first sampled voltage VIN1 on the 3rd resistance R3 is
48V*R3/ (R3+R2+R1), this refers to the resistance of each resistance；And VIN1 Yu VIN2 can be at input grounding mode determination module
Comparing with threshold voltage in 11, owing to the first sampled voltage is more than threshold voltage, and the second sampled voltage is less than thresholding electricity
Pressure, thereby results in the first amplifier comparator U1 and is output as high level, and the second amplifier comparator U2 is output as low level, and circuit is by this
Second compares output signal inputs to MCU control module 13, MCU control module 13 by input grounding alarm report module 12
Carrying out logical judgment is 10, then can report the information of the direct current input negative wire ground connection of power supply.
Mode of operation three, when direct current input main track 48VIN+ and direct current input negative wire 48VIN-do not protect ground wire PE with connecing
During electrical connection, the first diode D1, the second diode D2, the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance
R4, the 5th resistance R5 and the 6th resistance R6 constitute the sampling circuit to input resistance to earth sampling module 10, the 3rd resistance R3 and
6th resistance R6 is sampling resistor, owing to the first sampled voltage VIN1 on the 3rd resistance R3 is 48V*R3/ (R3+R2+R1), and
The second sampled voltage VIN2 on 6th resistance R6 is 48V*R6/ (R6+R5+R4), and the first sampled voltage VI N1 and second adopts
Sample voltage VIN2 can compare with threshold voltage, due to the first sampled voltage in input grounding mode determination module 11
VIN1 and the second sampled voltage VIN2 is all higher than threshold voltage, causes the second amplifier comparator U2 to be output as high level, the first fortune
Put comparator U1 and be output as high level, circuit by this second compare output signal by input grounding alarm report module 12 defeated
Entering to MCU control module 13, it is 11 that MCU control module 13 carries out logical judgment, then can go up the event that telegraph circuit input grounding is bad
Barrier warning information.
The direct-current remote feeding power input grounding testing circuit of present invention offer and detection method thereof, this circuit includes input
Resistance to earth sampling module 10, input grounding mode determination module 11, input grounding alarm report module 12 and MCU control mould
Block 13, input grounding mode determination module 11 can input positive negative wire according to direct current on input resistance to earth sampling module 10 and meet guarantor
Protect the state being electrically connected to ground, judge the low and high level on the first amplifier comparator U1 and the second amplifier comparator U2, finally
By input grounding alarm report module 12, comparative result being sent to MCU control module 13, MCU control module 13 is to direct current
Far input different earthing modes for circuit to judge, distinguish the earthing mode that input is different, reach input grounding
Detection and the purpose of fault warning, the circuit i.e. provided in the present invention make use of the feature of 48V input grounding, uses resistance to provide
Ground voltage sampling circuit, carries out logical analysis and judgement by different earthing modes, distinguishes the ground connection side that input is different
Formula, reaches input grounding detection and the purpose of fault warning, thus realizes the bad alarm of input grounding and report, improve
The safety and reliability of the use of this power supply, and the method simple, provide the best to DC remote power supply application reliability
Place.
The several specific embodiments being only the present invention disclosed above, but the present invention is not limited to this, any ability
What the technical staff in territory can think change all should fall into protection scope of the present invention.
Claims (3)
1. a direct-current remote feeding power input grounding testing circuit, it is characterised in that include input resistance to earth sampling module,
Input grounding mode determination module, input grounding alarm report module and MCU control module；Described input resistance to earth is sampled
Module electrically connects with input grounding mode determination module, and described input grounding mode determination module is alerted by input grounding
Report module electrically connects with MCU control module；
Described input grounding mode determination module include the first amplifier comparator, the second amplifier comparator, the first Zener diode,
Second Zener diode, the 3rd Zener diode and the 4th Zener diode；3rd pin of described first amplifier comparator leads to
Crossing the first sampled voltage electrical connection of the 7th resistance and the 3rd resistance, the second pin of described first amplifier comparator passes through the 8th
Resistance is electrically connected to connect protection ground wire, and described 7th resistance is by being electrically connected to first after the 9th resistance connected and the tenth resistance
The negative pole of Zener diode, the first pin of described first amplifier comparator connects the first Zener diode and the second voltage stabilizing respectively
The positive pole of diode, the negative electricity of described second Zener diode is connected to input grounding alarm report module；Described second
3rd pin of amplifier comparator is electrically connected by the second sampled voltage of the 11st resistance and the 6th resistance, described second amplifier
Second pin of comparator is electrically connected to connect protection ground wire by the 12nd resistance, and described 11st resistance is by the tenth of series connection the
The negative pole of the 3rd Zener diode, the first pin of described second amplifier comparator it is electrically connected to after three resistance and the 14th resistance
Connecting the 3rd Zener diode and the positive pole of the 4th Zener diode respectively, the negative electricity of described 4th Zener diode is connected to
Input grounding alarm report module.
Direct-current remote feeding power input grounding testing circuit the most according to claim 1, it is characterised in that described input is right
Earth resistance sampling module includes the first diode, the second diode, the first electric capacity, the second electric capacity and six resistance；Direct current inputs
Main track is electrically connected to the positive pole of the first diode, the 3rd resistance and first after passing sequentially through the first resistance of series connection and the second resistance
Being electrically connected to the negative pole of the first diode after electric capacity parallel connection, one end of described first electric capacity is electrically connected to input grounding mode and judges
Module, direct current input negative wire is electrically connected to the negative pole of the second diode after passing sequentially through the 4th resistance of series connection and the 5th resistance,
Being electrically connected to the positive pole of the second diode after 3rd resistance and the second electric capacity parallel connection, one end of described second electric capacity is electrically connected to defeated
Enter earthing mode determination module, and the other end of described first electric capacity and the second electric capacity is electrically connected to connect protection ground wire, described
The voltage of direct current input main track and direct current input negative wire is 48V.
3. the detection method of a direct-current remote feeding power input grounding testing circuit, it is characterised in that comprise the following steps:
Step A: direct current input negative wire is carried out voltage sample and obtains the first sampled voltage, carries out voltage to direct current input main track and adopts
Sample obtains the second sampled voltage, and sends the first sampled voltage and the second sampled voltage to input grounding mode determination module；
Described input grounding mode determination module include the first amplifier comparator, the second amplifier comparator, the first Zener diode, second
Zener diode, the 3rd Zener diode and the 4th Zener diode；3rd pin of described first amplifier comparator is by the
Seven resistance and the first sampled voltage electrical connection of the 3rd resistance, the second pin of described first amplifier comparator passes through the 8th resistance
Being electrically connected to connect protection ground wire, described 7th resistance is by being electrically connected to the first voltage stabilizing after the 9th resistance connected and the tenth resistance
The negative pole of diode, the first pin of described first amplifier comparator connects the first Zener diode and the second voltage stabilizing two pole respectively
The positive pole of pipe, the negative electricity of described second Zener diode is connected to input grounding alarm report module；Described second amplifier
3rd pin of comparator is electrically connected by the second sampled voltage of the 11st resistance and the 6th resistance, and described second amplifier compares
Second pin of device is electrically connected to connect protection ground wire by the 12nd resistance, described 11st resistance the 13rd electricity by series connection
Being electrically connected to the negative pole of the 3rd Zener diode after resistance and the 14th resistance, the first pin of described second amplifier comparator is respectively
Connecting the 3rd Zener diode and the positive pole of the 4th Zener diode, the negative electricity of described 4th Zener diode is connected to input
Ground connection property alarm report module；
Step B: the first sampled voltage is compared by the first amplifier comparator in input grounding mode determination module, and input connects
Second sampled voltage is compared by the second amplifier comparator in ground mode determination module, and obtains comparative result；
Step C: comparative result is inputed to MCU control module, by MCU control module by input grounding alarm report module
Judge according to comparative result whether the input grounding of power supply breaks down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310379945.4A CN103792444B (en) | 2013-08-20 | 2013-08-20 | Direct-current remote feeding power input grounding testing circuit and detection method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310379945.4A CN103792444B (en) | 2013-08-20 | 2013-08-20 | Direct-current remote feeding power input grounding testing circuit and detection method thereof |
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| Publication Number | Publication Date |
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| CN103792444A CN103792444A (en) | 2014-05-14 |
| CN103792444B true CN103792444B (en) | 2016-12-28 |
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| CN1580796A (en) * | 2003-08-08 | 2005-02-16 | 欧姆龙株式会社 | DC. detection circuit and DC. earthing current detection circuit |
| CN201130227Y (en) * | 2007-11-30 | 2008-10-08 | 上海市电力公司超高压输变电公司 | Portable DC earthing seeking instrument |
| CN102830334A (en) * | 2012-08-12 | 2012-12-19 | 江苏旭源科技有限公司 | Novel photovoltaic grid-connected inverter insulation detection circuit and detection method thereof |
| CN202872325U (en) * | 2012-09-26 | 2013-04-10 | 比亚迪股份有限公司 | Direct current grounding detection protection device used for photovoltaic power generation system |
| CN103107518A (en) * | 2012-12-24 | 2013-05-15 | 深圳创动科技有限公司 | Photovoltaic inverter and protector thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10300539B4 (en) * | 2003-01-09 | 2007-05-24 | Daimlerchrysler Ag | Circuit and method for detecting insulation faults |
| KR101287173B1 (en) * | 2013-03-13 | 2013-07-17 | 에이치엠이 주식회사 | Ground monitor |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1580796A (en) * | 2003-08-08 | 2005-02-16 | 欧姆龙株式会社 | DC. detection circuit and DC. earthing current detection circuit |
| CN201130227Y (en) * | 2007-11-30 | 2008-10-08 | 上海市电力公司超高压输变电公司 | Portable DC earthing seeking instrument |
| CN102830334A (en) * | 2012-08-12 | 2012-12-19 | 江苏旭源科技有限公司 | Novel photovoltaic grid-connected inverter insulation detection circuit and detection method thereof |
| CN202872325U (en) * | 2012-09-26 | 2013-04-10 | 比亚迪股份有限公司 | Direct current grounding detection protection device used for photovoltaic power generation system |
| CN103107518A (en) * | 2012-12-24 | 2013-05-15 | 深圳创动科技有限公司 | Photovoltaic inverter and protector thereof |
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| CN103792444A (en) | 2014-05-14 |
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