CN203249994U - Diode online detection circuit - Google Patents
Diode online detection circuit Download PDFInfo
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- CN203249994U CN203249994U CN 201320012103 CN201320012103U CN203249994U CN 203249994 U CN203249994 U CN 203249994U CN 201320012103 CN201320012103 CN 201320012103 CN 201320012103 U CN201320012103 U CN 201320012103U CN 203249994 U CN203249994 U CN 203249994U
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Abstract
The utility model discloses a diode online detection circuit, comprising an exciting circuit, a fault decision circuit, and a reference circuit. The exciting circuit is connected with a to-be-detected diode and is used to provide excitation current for the to-be-detected diode. The fault decision circuit is connected with the to-be-detected diode, used to detect voltage on two ends of the to-be-detected diode and compare the detected voltage and reference voltage provided by the reference circuit, and according to comparison results, working condition of the to-be-detected diode is determined. The reference circuit is connected with the fault decision circuit and is used to provide reference voltage for the fault decision circuit. The technical scheme of the diode online detection circuit can detect working conditions of diodes on line in real time without influencing regular transmission of high-power electric energy. The circuit does not need manual operation, and is characterized by simple structure, convenient realization, low power loss, etc.
Description
Technical field
The utility model relates to the circuit engineering field, is specifically related to a kind of diode at line detection circuit.
Background technology
Crystal diode is a kind of semiconductor devices with unilateal conduction characteristic, uses very extensively in the power conversion field, is one of a kind of indispensable important devices.In the power conversion circuit of large electric current or large voltage, diode produces fault can make electric current or voltage in the circuit produce huge variation, make the circuit cisco unity malfunction, more serious meeting makes the circuit paralysis, cause serious consequence, whether work so in DC power system, must detect diode, take precautions against in possible trouble.
At present, diode detection method commonly used has two kinds: a kind of is detection under the outage; A kind of be the energising under detection.In the situation that outage, to the detection of diode, mainly the diode shelves with multimeter detect its forward and reverse electric conductivity, see its unilateal conduction characteristic whether well, whether damage etc.In the situation that energising, be exactly to detect forward drop between diode two electrodes with multimeter to the detection of diode.Its detection method has two kinds: the one, directly survey diode both end voltage value with multimeter; The 2nd, with " " as a reference point, black meter pen be connected to " ", red test pencil measures respectively diode anode voltage and cathode voltage, judges according to the difference of anode voltage and cathode voltage whether diode works again.Above two kinds of measuring methods are all more consuming time, can not realize that real-time online detects, and need manually-operated, dangerous property in the DC power system of the large voltage of switching on or large electric current.
The utility model content
The utility model provides a kind of diode at line detection circuit, can not be to the technical matters of diode real-time online detection to solve prior art.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of diode comprises at line detection circuit: be connected with diode to be detected, be used to diode to be detected that the exciting circuit of exciting current is provided; Be connected with diode to be detected, for detection of the voltage at diode to be detected two ends, and the reference voltage that the voltage that detects and reference circuit provide compared, judge the failure determinating circuit of the duty of diode to be detected according to comparative result; And, be connected with failure determinating circuit, be used to failure determinating circuit that the reference circuit of reference voltage is provided.
Wherein, described exciting circuit comprises voltage source, resistance and diode, perhaps comprises voltage source, current source and diode; Described reference circuit comprises stabilivolt and resistance, perhaps comprises reference source and resistance, perhaps only comprises resistance; Described failure determinating circuit comprises six resistance, two comparers and enhancement mode NMOS pipe, perhaps comprises six resistance, two comparers and NPN type triode, perhaps comprises three resistance, two comparers and a rejection gate.
The utility model embodiment technical scheme has the duty that can real-time online detects diode, does not affect the normal transmission of high-power power, does not need manually-operated, and is simple in structure, and it is convenient to realize, power attenuation is little, etc. characteristics.
Description of drawings
The diode that Fig. 1 provides for the utility model embodiment one is in the schematic block circuit diagram of line detection circuit;
The diode that Fig. 2 provides for the utility model embodiment two is at the circuit theory diagrams of line detection circuit;
The diode that Fig. 3 provides for the utility model embodiment three is at the circuit theory diagrams of line detection circuit;
The diode that Fig. 4 provides for the utility model embodiment four is at the circuit theory diagrams of line detection circuit;
The diode that Fig. 5 provides for the utility model embodiment five is at the circuit theory diagrams of line detection circuit.
Embodiment
Embodiment one
As shown in Figure 1, the utility model embodiment provides a kind of diode at line detection circuit, can be used for detecting online the fault of diode.This diode comprises at line detection circuit: the exciting circuit (1) that is connected with diode to be detected (2) respectively and failure determinating circuit (4), and the reference circuit (3) that is connected with failure determinating circuit (4), described exciting circuit (1) is used to diode to be detected (2) that exciting current is provided, described reference circuit (3) is used to failure determinating circuit (4) that reference voltage is provided, described failure determinating circuit (4) is for detection of the voltage at diode to be detected (2) two ends, and voltage and the reference voltage that detects compared, judge the duty of diode to be detected (2) according to comparative result.
Wherein, described exciting circuit (1) comprises voltage source, resistance and diode, perhaps comprises voltage source, current source and diode; Described reference circuit (3) comprises stabilivolt and resistance, perhaps comprises reference source and resistance, perhaps only comprises resistance; Described failure determinating circuit (4) comprises six resistance, two comparers and enhancement mode NMOS pipe, perhaps comprises six resistance, two comparers and NPN type triode, perhaps comprises three resistance, two comparers and a rejection gate.
Described duty is divided into short circuit, open circuit and normal three kinds.Failure determinating circuit (4) has three outputs and brings in these three kinds of duties of expression, when certain output terminal when for example the short circuit output terminal is high level, represents that namely current duty is short circuit.
Technical solutions of the utility model have the duty that can real-time online detects diode, do not affect the normal transmission of high-power power, do not need manually-operated, and are simple in structure, and it is convenient to realize, power attenuation is little, etc. characteristics.
Embodiment two
Please refer to Fig. 2, in the present embodiment, described diode to be detected (2) is specially diode D2 to be detected, described exciting circuit (1) comprises voltage source V 1, resistance R 1 and diode D1, the end of the anodal connecting resistance R1 of described voltage source V 1, the negative electrode of the negative pole of voltage source V 1 and diode D2 to be detected joins; The anode of the other end of described resistance R 1 and diode D1 joins, and the anode of the negative electrode of described diode D1 and diode D2 to be detected joins.
Described reference circuit (3) comprises stabilivolt ZD1 and resistance R 3.One end of described resistance R 3 and the positive pole of voltage source V 1 join, and an end of the resistance R 5 in the negative electrode of the other end of resistance R 3 and stabilivolt ZD1 and the failure determinating circuit (4) joins, and the negative pole of the anode of described stabilivolt ZD1 and voltage source V 1 joins.
Described failure determinating circuit (4) comprises resistance R 2, R4, R5, R6, R7, R8, comparer U1, U2 and NPN type triode VT1(hereinafter referred triode VT1).One end of described resistance R 2 and the positive pole of voltage source V 1 join, and the collector of the other end of resistance R 2 and triode VT1 joins; One of described resistance R 4 is terminated at the output terminal of comparer U1, and the base stage of the other end of resistance R 4 and triode VT1 is joined; One end of described resistance R 5 and the negative electrode of stabilivolt ZD1 join and are connected to the inverting input of comparer U1, and the in-phase input end of the other end of resistance R 5 and comparer U2 joins; One end of described resistance R 6 and the in-phase input end of comparer U2 join, and the other end of resistance R 6 is connected to the negative pole of voltage source V 1; One end of described resistance R 7 and the output terminal of comparer U2 join, and the base stage of the other end of resistance R 7 and triode VT1 is joined; One of described resistance R 8 is terminated at the base stage of triode VT1, and the emitter of the other end of resistance R 8 and triode VT1 joins; The inverting input of the in-phase input end of described comparer U1 and comparer U2 joins and is connected to the anode of diode D2 to be detected; The emitter of described triode VT1 is connected to the negative pole of voltage source V 1.
Embodiment three
Please refer to Fig. 3, the different of the present embodiment and embodiment two are:
Described reference circuit (3) comprises resistance R 3 and reference source U3; The positive pole of voltage source V 1 in the one termination exciting circuit 1 of described resistance R 3, the negative electrode of the other end of resistance R 3 and reference source U3 joins; The reference edge of described reference source U3 and the negative electrode of self join, and the anode of reference source U3 is connected to the negative pole of voltage source V 1.
Described failure determinating circuit (4) comprises resistance R 5, R6, R9, comparer U1, U2 and rejection gate U4, and an end of described resistance R 9 and the reference edge of reference source U3 join, and the other end of resistance R 9 is connected to the inverting input of comparer U1; Input end of described rejection gate U4 and the output terminal of comparer U1 join, and another input end of rejection gate U4 is connected to the output terminal of comparer U2.
The remaining circuit structure is all identical with embodiment two.
Embodiment four
Please refer to Fig. 4, what the present embodiment and embodiment two were different is:
Described exciting circuit (1) comprises current source Is, diode D1, voltage source V 1; The positive pole of described current source Is connects the anode of diode D1, and the negative pole of current source Is is connected to the negative pole of voltage source V 1; The negative electrode reception of described diode D1 detects the anode of diode D2, and the negative pole of the negative electrode of described diode D2 to be detected and current source Is joins.
Described reference circuit only has resistance R 3 in (3), the positive pole of a termination voltage source V1 of described resistance R 3, and the inverting input of the other end comparer U1 of resistance R 3 joins.
Full-controlled switch in the described failure determinating circuit (4) is enhancement mode NMOS pipe VT2, rather than NPN type triode VT1, the drain electrode of described enhancement mode NMOS pipe VT2 and an end of resistance R 2 join, the source electrode of enhancement mode NMOS pipe VT2 is connected to the negative pole of current source Is, and the grid of enhancement mode NMOS pipe VT2 joins with the other end of resistance R 4 and the end of R7; The grid of one end of described resistance R 8 and NMOS pipe VT2 joins, and the other end of resistance R 8 is connected to the negative pole of current source Is, and the positive pole of the other end of described resistance R 2 and voltage source V 1 joins.
The remaining circuit structure is all identical with embodiment two.
Embodiment five
Please refer to Fig. 5, what the present embodiment and embodiment two were different is:
Described exciting circuit (1) comprises current source Is, diode D1, voltage source V 1; The positive pole of described current source Is connects the anode of diode D1, and the negative pole of current source Is is connected to the negative pole of voltage source V 1; The negative electrode reception of described diode D1 detects the anode of diode D2, and the negative pole of the negative electrode of described diode D2 to be detected and current source Is joins.
Described reference circuit (3) comprises resistance R 3 and reference source U3, the positive pole of a termination voltage source V1 of described resistance R 3, and the negative electrode of the other end of resistance R 3 and reference source U3 joins; The reference edge of described reference source U3 and its negative electrode join, and the anode of reference source U3 is connected to the negative pole of current source Is.
Described failure determinating circuit (4) comprises resistance R 5, R6, R9, comparer U1, U2 and rejection gate U4, and an end of described resistance R 9 and the reference edge of reference source U3 join, and the other end of resistance R 9 is connected to the inverting input of comparer U1; Input end of described rejection gate U4 and the output terminal of comparer U1 join, and another input end of rejection gate U4 is connected to the output terminal of comparer U2.
The remaining circuit structure is all identical with embodiment two.
The basic functional principle of technical solutions of the utility model is: exciting circuit provides enough exciting currents for diode to be detected, and when guaranteeing to work, the variation of the forward voltage at diode to be detected two ends is unlikely too greatly; Failure determinating circuit compares by the reference voltage that voltage and reference circuit with diode to be detected two ends provide, thereby judges the duty of diode to be detected.
The specific works principle of technical solutions of the utility model is:
Take Fig. 2 as example, under the normal operating conditions, the magnitude of voltage at diode D2 to be detected two ends is in a predictable scope, this scope is less than the set-point of comparer U1 inverting input, and greater than the set-point of U2 in-phase input end, U1, U2 output is low level, and triode VT1 turn-offs, " normally " end is high level, and other ends are low level; When if short trouble appears in diode D2 to be detected, the magnitude of voltage at diode D2 to be detected two ends is less than the set-point of comparer U2 in-phase input end, simultaneously also less than the set-point of U1 inverting input, the U1 output low level, U2 exports high level, triode VT1 conducting, " short circuit " end is high level, other ends are low level; When open fault appears in diode D2 to be detected, the magnitude of voltage at diode D2 to be detected two ends is greater than the set-point of comparer U1 inverting input, and the set-point greater than comparer U2 in-phase input end, U1 exports high level, the U2 output low level, triode VT1 conducting, " open circuit " end is high level, other ends are low level.Technical solutions of the utility model are in the situation that affect high-power energy normal transmission, and fault that can the online automatic detection diode has satisfied the requirement of circuit normal operation.
Among the embodiment two, described reference circuit (3) comprises stabilivolt ZD1 and resistance R 3.One end of described resistance R 3 and the positive pole of voltage source V 1 join, and the negative electrode of the other end of resistance R 3 and stabilivolt ZD1 and an end of resistance R 5 join; The negative electrode of described stabilivolt ZD1 connects the negative pole of voltage source V 1.Among embodiment three and the embodiment five, described reference circuit (3) comprises resistance R 3 and reference source U3, and one of described resistance R 3 is terminated at the positive pole of voltage source V 1, and the negative electrode of the other end of resistance R 3 and reference source U3 joins; The anode of described reference source U3 connects the negative pole of current source Is.Among the embodiment four, described reference circuit (3) comprises resistance R 3.The positive pole of the termination voltage source V1 of described R3, the inverting input of the other end of resistance R 3 and comparer U1 joins.Reference circuit is different among each embodiment, but its effect all is for failure determinating circuit provides determinating reference, and three kinds of reference circuits can both provide accurately reference voltage.
Among the embodiment four, full-controlled switching element in the failure determinating circuit (4) adopts enhancement mode NMOS pipe VT2, enhancement mode NMOS pipe belongs to the unipolarity device, when turning on and off, it only have majority carrier to participate in conduction, so when switch turn-offs, saved the reverse recovery time of electronics than triode, faster from the switching speed that makes circuit, can fault appear the rapid reaction measured diode, but because metal-oxide-semiconductor is the voltage driven type device, its driving voltage should be greater than 5V, and generally speaking the cost ratio triode of metal-oxide-semiconductor is high, so require high in switching speed, driving voltage is large and can adopt when cost do not required.
The effect of diode D1 is among each embodiment: when open circuit appears in diode D2 to be detected, prevent that external high pressure from causing damage to exciting circuit, play the effect of protection exciting circuit.
Full-controlled switching element in above-described embodiment can change similar on-off element into, and such as IGBT, Darlington pipe etc., the circuit dirigibility is larger, can replace as requested.
Technical solutions of the utility model can guarantee correctly to measure the duty of diode, can also be widely used in other electronic products.
The above diode that the utility model embodiment is provided is described in detail at line detection circuit, but above embodiment only is preferred embodiment of the present utility model, just be used for helping to understand method of the present utility model and core concept thereof, should not be construed as restriction of the present utility model.Those skilled in the art are in the technical scope that the utility model discloses, and the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.
Claims (9)
1. a diode is characterized in that at line detection circuit, comprising:
Be connected with diode to be detected, be used to diode to be detected that the exciting circuit of exciting current is provided; Be connected with diode to be detected, for detection of the voltage at diode to be detected two ends, and the reference voltage that the voltage that detects and reference circuit provide compared, judge the failure determinating circuit of the duty of diode to be detected according to comparative result; And, be connected with failure determinating circuit, be used to failure determinating circuit that the reference circuit of reference voltage is provided.
According to diode claimed in claim 1 at line detection circuit, it is characterized in that:
Described exciting circuit comprises voltage source, resistance and diode, perhaps comprises voltage source, current source and diode;
Described reference circuit comprises stabilivolt and resistance, perhaps comprises reference source and resistance, perhaps only comprises resistance;
Described failure determinating circuit comprises six resistance, two comparers and NPN type triode, perhaps comprises six resistance, two comparers and enhancement mode NMOS pipe, perhaps comprises three resistance, two comparers and a rejection gate.
According to diode claimed in claim 2 at line detection circuit, it is characterized in that: described exciting circuit comprises voltage source V 1, resistance R 1 and diode D1, the positive pole of described voltage source V 1 is connected to an end of resistance R 1, the negative electrode of the negative pole of voltage source V 1 and diode D2 to be detected joins, the anode of the other end of resistance R 1 and diode D1 joins, and the anode of the negative electrode of described diode D1 and diode D2 to be detected joins.
According to diode claimed in claim 2 at line detection circuit, it is characterized in that: described exciting circuit comprises current source Is, diode D1 and voltage source V 1, described reference circuit comprises resistance R 3, the anodic bonding of the positive pole of described current source Is and diode D1, the negative pole of current source Is is connected with the negative electrode of diode D2 to be detected, the anode of the negative electrode of described diode D1 and diode D2 to be detected joins, the end of the anodal connecting resistance R3 of described voltage source V 1, the negative electrode of the negative pole of voltage source V 1 and diode D2 to be detected joins.
According to diode claimed in claim 2 at line detection circuit, it is characterized in that: described exciting circuit comprises voltage source V 1, described reference circuit comprises stabilivolt ZD1 and resistance R 3, one end of described resistance R 3 and the positive pole of voltage source V 1 join, the negative electrode of the other end of resistance R 3 and stabilivolt ZD1 joins, and the negative pole of the anode of described stabilivolt ZD1 and voltage source V 1 joins.
According to diode claimed in claim 2 at line detection circuit, it is characterized in that: described exciting circuit comprises voltage source V 1, described reference circuit comprises resistance R 3 and reference source U3, one of described resistance R 3 is terminated at the positive pole of voltage source V 1, the negative electrode of the other end of resistance R 3 and reference source U3 joins, the negative electrode of described reference source U3 and the reference edge of self join, and the anode of reference source U3 is connected to the negative pole of voltage source V 1.
According to diode claimed in claim 2 at line detection circuit, it is characterized in that: described exciting circuit comprises voltage source V 1, described failure determinating circuit comprises comparer U1, described reference circuit comprises resistance R 3, one of described resistance R 3 is terminated at the positive pole of voltage source V 1, and the inverting input of the other end of resistance R 3 and comparer U1 joins.
According to diode claimed in claim 2 at line detection circuit, it is characterized in that: described exciting circuit comprises voltage source V 1, described reference circuit comprises stabilivolt ZD1, described failure determinating circuit comprises resistance R 2, R4, R5, R6, R7, R8, comparer U1, U2 and NPN type triode VT1, one end of described resistance R 2 and the positive pole of voltage source V 1 join, and the collector of the other end of resistance R 2 and NPN type triode VT1 joins; One of described resistance R 4 is terminated at the output terminal of comparer U1, and the base stage of the other end of resistance R 4 and NPN type triode VT1 is joined; One end of described resistance R 5 and the negative electrode of stabilivolt ZD1 join and are connected to the inverting input of comparer U1, and the in-phase input end of the other end of resistance R 5 and comparer U2 joins; One end of described resistance R 6 and the in-phase input end of comparer U2 join, and the other end of resistance R 6 is connected to the negative pole of voltage source V 1; One end of described resistance R 7 and the output terminal of comparer U2 join, and the base stage of the other end of resistance R 7 and NPN type triode VT1 is joined; One of described resistance R 8 is terminated at the base stage of NPN type triode VT1, and the emitter of the other end of resistance R 8 and NPN type triode VT1 joins; The inverting input of the in-phase input end of described comparer U1 and comparer U2 joins and is connected to the anode of diode D2 to be detected; The emitter of described triode VT1 is connected to the negative pole of voltage source V 1.
According to diode claimed in claim 2 at line detection circuit, it is characterized in that: described exciting circuit comprises voltage source V 1 and current source Is, described failure determinating circuit comprises resistance R 2, R4, R5, R6, R7, R8, comparer U1, U2 and enhancement mode NMOS pipe VT2, the drain electrode of one end of described resistance R 2 and enhancement mode NMOS pipe VT2 is joined, and the other end of resistance R 2 is connected to the positive pole of voltage source V 1; One of described resistance R 4 is terminated at the output terminal of comparer U1, and the grid of the other end of resistance R 4 and enhancement mode NMOS pipe VT2 joins; One of described resistance R 5 is terminated at the inverting input of comparer U1, and the in-phase input end of the other end of resistance R 5 and comparer U2 joins; One end of described resistance R 6 and the in-phase input end of comparer U2 join, the negative pole of another termination current source Is of resistance R 6; One end of described resistance R 7 and the output terminal of comparer U2 join, and the other end of resistance R 7 is connected to the grid of enhancement mode NMOS pipe VT2; The grid of one end of described resistance R 8 and enhancement mode NMOS pipe VT2 joins, and the other end of resistance R 8 is connected to the negative pole of current source Is; The inverting input of the in-phase input end of described comparer U1 and comparer U2 joins and is connected to the anode of diode D2 to be detected; The source electrode of described NMOS pipe VT2 and the negative pole of current source Is join.
10.According to diode claimed in claim 2 at line detection circuit, it is characterized in that: described exciting circuit comprises voltage source V 1, described reference circuit comprises reference source U3, described failure determinating circuit comprises resistance R 5, R6, R9, comparer U1, U2 and rejection gate U4, one of described resistance R 5 is terminated at the inverting input of comparer U1, and the in-phase input end of the other end of resistance R 5 and comparer U2 joins; One end of described resistance R 6 and the in-phase input end of comparer U2 join, the negative pole of another termination current source Is of resistance R 6; One end of described resistance R 9 and the reference edge of reference source U3 join, and the other end of resistance R 9 is connected to the inverting input of comparer U1; The inverting input of the in-phase input end of described comparer U1 and comparer U2 joins and is connected to the anode of diode D2 to be detected; The input end of the output terminal ANDORNOTgate U4 of described comparer U1 joins, and another input end of the output terminal ANDORNOTgate U4 of described comparer U2 joins.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320012103 CN203249994U (en) | 2013-01-10 | 2013-01-10 | Diode online detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320012103 CN203249994U (en) | 2013-01-10 | 2013-01-10 | Diode online detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926516A (en) * | 2013-01-10 | 2014-07-16 | 深圳市金宏威技术股份有限公司 | Online diode detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103926516A (en) * | 2013-01-10 | 2014-07-16 | 深圳市金宏威技术股份有限公司 | Online diode detection circuit |
| CN103926516B (en) * | 2013-01-10 | 2017-02-08 | 深圳市金宏威技术有限责任公司 | Online diode detection circuit |
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Address after: 518000 Guangdong city of Shenzhen province Nanshan District South Road No. 9 nine Wei new software park building 8 floor 701-712 room 7 Patentee after: Shenzhen Jinhongwei Technology Co., Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District South Road No. 9 nine Wei new software park building 8 floor 701-712 room 7 Patentee before: Shenzhen Jinhongwei Technology Co.,Ltd. |
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Granted publication date: 20131023 Termination date: 20210110 |
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