CN203688665U - High accuracy multipath common-ground DC power supply insulation resistor detection circuit - Google Patents

High accuracy multipath common-ground DC power supply insulation resistor detection circuit Download PDF

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CN203688665U
CN203688665U CN201320481819.5U CN201320481819U CN203688665U CN 203688665 U CN203688665 U CN 203688665U CN 201320481819 U CN201320481819 U CN 201320481819U CN 203688665 U CN203688665 U CN 203688665U
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resistance
direct supply
switch
altogether
ground
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张玉林
朱国忠
张俊
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SHANGHAI CHINT POWER SYSTEMS CO Ltd
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SHANGHAI CHINT POWER SYSTEMS CO Ltd
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Abstract

The utility model discloses a high accuracy multipath common-ground DC power supply insulation resistor detection circuit, comprising an m-path DC power supply which is co-cathode connected or co-anode connected. The high accuracy multipath common-ground DC power supply insulation resistor detection circuit is characterized in that if the m-path DC power supply is co-cathode connected, a resistor R<0> and a switch which are serially connected are connected to between the cathode of the DC power supply and the ground in parallel, and that if the path DC power supply is co-anode connected, the resistor R<0> and the switch which are connected serially are connected to between the anode of the DC power supply and the ground in parallel. The high accuracy multipath common-ground DC power supply insulation resistor detection circuit, aiming to the co-cathode (anode) multi-input DC power electronic system, provides a practical and easy insulation impedance calculation method and possesses advantages of easy hardware circuits and low calculated quantity.

Description

High-precision multichannel is direct supply insulating resistor detecting circuit altogether
Technical field
The utility model relates to a kind of multichannel input DC power insulation impedance circuit for detecting, is applied to DC power system, particularly field of photovoltaic power generation and battery applications device.
Background technology
In high voltage direct current electric power system, as photovoltaic generating system and electric automobile electric power system, for guaranteeing operator safety, straight-flow system need to have enough insulation.As the German VDE0126 requirement of formulating for photovoltaic DC-to-AC converter, DC power system need to detect insulation resistance, and when insulation resistance is less than setting, inverter does not allow to access operation of power networks.
Photovoltaic DC-to-AC converter insulation against ground resistance at present, adopts the detection method based on bridge balance principle conventionally.In patent " insulation resistance method for detecting ", its circuit used as shown in Figure 1, the insulation resistance just over the ground and between bearing over the ground at photovoltaic cell PV is respectively Rp and Rn, for detecting this insulation resistance, between input is positive and negative and two switch S 1 and S2, S1 and S2 series connection, its mid point connects safely by a resistance R 0.Control S1 and S2 closure, detect respectively R0 voltage twice, then in conjunction with input voltage vin, according to circuit kirchhoff's principle, can list two equations, thereby solve Rp and Rn.
In patent " a kind of direct supply insulation against ground resistance detecting circuit and detection method thereof ", adopt bridge circuit shown in Fig. 2, than Fig. 1, increase by one group of resistance R 1, and additional resistance value is chosen and is optimized design, thereby improved insulation resistance Rp1 and Rn accuracy of detection.
The circuit of more simplifying that used in patent " two branch road input photovoltaic combining inverter insulation against ground resistance detection system ", as shown in Figure 3, circuit reduces a switch and one group of external resistor, also can reach the object that two insulation resistance Rp and Rn detected.And for solar cell power generation system application, realize two-way insulation resistance, the detecting of totally 3 unknown resistances, but its realization is to utilize the solar panel output can short circuit feature, the method of short circuit V1 and V2, obtains other two groups of equatioies, thereby asks for 3 insulation resistances respectively.This patent institute extracting method can only be used for the source that direct supply can short circuit, as solar panel, and implements in the situation that short-circuit current is less, and practicality is lower.In the larger situation of input direct-current source short-circuit current or input have in larger storage capacitor situation, short circuiting switch in circuit is very easy to damage.
Above scheme is all for passing through the different circuit equation of structure, ask for respectively the mode of each unknown insulation resistance, judge whether system insulating resistance exceeds standard, in N input direct-current source situation, also need to have N same circuits, to solve 2N unknown resistance value, even if power supply is wherein in a situation about extremely sharing, also need to solve N+1 unknown resistance, the calculated amount of circuit complexity and processor all can increase considerably, realize cost thereby increase hardware circuit, and take processor excess resource, reduce system response time.
Summary of the invention
The technical problems to be solved in the utility model is to simplify insulation impedance in multi-channel dc power supply to detect the hardware circuit using, and has operand low, detecting precision high.
In order to solve the problems of the technologies described above, the technical solution of the utility model has been to provide a kind of multichannel input DC power insulation impedance circuit for detecting, comprises road direct supply,
Figure DEST_PATH_611154DEST_PATH_IMAGE002
road direct supply altogether negative pole connects or anodal connection altogether, it is characterized in that: if road direct supply altogether negative pole connects, between the negative pole of direct supply and ground and connect the resistance of connecting and first switch;
If
Figure DEST_PATH_215890DEST_PATH_IMAGE002
road direct supply is anodal connection altogether, between the positive pole of direct supply and ground and connect the resistance of connecting
Figure DEST_PATH_944811DEST_PATH_IMAGE004
and first switch.
Preferably, if road direct supply altogether negative pole connects, and the positive pole of Ze Mei road direct supply connects respectively the anode of a diode, the equal contact resistance of negative electrode of all diodes
Figure DEST_PATH_DEST_PATH_IMAGE006
one end, resistance
Figure DEST_PATH_583920DEST_PATH_IMAGE006
other end serial connection second switch after ground connection, resistance resistance and described resistance
Figure DEST_PATH_368522DEST_PATH_IMAGE004
resistance suitable.
Preferably, described resistance
Figure DEST_PATH_251028DEST_PATH_IMAGE004
or described resistance
Figure DEST_PATH_665828DEST_PATH_IMAGE006
be the independent resistance of a resistance composition, or be at least two equivalent resistances that resistance serial or parallel connection forms.
Preferably, at the resistance of described series connection
Figure DEST_PATH_608377DEST_PATH_IMAGE004
and the two ends of the first switch connect the resistance of series connection
Figure DEST_PATH_DEST_PATH_IMAGE008
and resistance
Figure DEST_PATH_DEST_PATH_IMAGE010
; Described diode or be to increase separately, or diode in multiplexing circuit under test.
Preferably, described resistance
Figure DEST_PATH_601304DEST_PATH_IMAGE008
and described resistance
Figure DEST_PATH_21921DEST_PATH_IMAGE010
all select resistance to be far longer than the resistance of insulation resistance protection threshold values, this resistance
Figure DEST_PATH_556807DEST_PATH_IMAGE008
and resistance
Figure DEST_PATH_732574DEST_PATH_IMAGE010
for individual resistors, or it is the equivalent resistance of multiple resistance series connection.
Preferably, described the first switch or described second switch are gate-controlled switch, or are hand switch.
Actual many direct currents input electric power electronic system, the overwhelming majority is common negative or positive utmost point electrode systems.The advantages such as the utility model, for the multi-input direct current power electronic system of bearing altogether (just) utmost point, proposes a kind of simple and practical insulation impedance detecting computing method, has hardware circuit simple, and software calculated amount is low.
Accompanying drawing explanation
Fig. 1 is the testing circuit adopting based on bridge balance principle;
Fig. 2 is the testing circuit that adopts bridge circuit;
Fig. 3 is the testing circuit after simplifying;
Fig. 4 is disclosed in embodiment 1 the road direct supply multichannel input DC power insulation impedance circuit for detecting that negative pole connects altogether;
Fig. 5 is that in embodiment 1, precision is detected in disclosed raising
Figure DEST_PATH_882113DEST_PATH_IMAGE002
the road direct supply multichannel input DC power insulation impedance circuit for detecting that negative pole connects altogether;
Fig. 6 is the circuit diagram of differential resistor sample mode;
Fig. 7 is the disclosed high-precision multichannel circuit diagram of direct supply insulating resistor detecting circuit altogether in embodiment 2.
Embodiment
For the utility model is become apparent, hereby with preferred embodiment, and coordinate accompanying drawing to be described in detail below.
Embodiment 1
As shown in Figure 4, the disclosed a kind of multichannel input DC power insulation impedance circuit for detecting of the present embodiment, comprises
Figure DEST_PATH_5926DEST_PATH_IMAGE002
road direct supply, its output voltage is respectively
Figure DEST_PATH_DEST_PATH_IMAGE012
,
Figure DEST_PATH_290277DEST_PATH_IMAGE002
road direct supply altogether negative pole connects, and the positive pole of every road direct supply insulation impedance is over the ground respectively
Figure DEST_PATH_DEST_PATH_IMAGE014
, the voltage at each insulation impedance two ends is respectively
Figure DEST_PATH_DEST_PATH_IMAGE016
, resistance
Figure DEST_PATH_DEST_PATH_IMAGE018
for the negative pole of direct supply over the ground, between the negative pole of direct supply and ground and connect the resistance of connecting
Figure DEST_PATH_328903DEST_PATH_IMAGE004
and first switch S.The first switch S is hand switch, or is gate-controlled switch.Resistance be the independent resistance of a resistance composition, or be at least two equivalent resistances that resistance serial or parallel connection forms.
The multichannel input DC power insulation impedance method for detecting that adopts foregoing circuit, the steps include:
The first step, build above-mentioned multichannel input DC power insulation impedance circuit for detecting;
Second step, when the first switch S remains open, detect that negative pole altogether connects
Figure DEST_PATH_538484DEST_PATH_IMAGE002
the negative pole of road direct supply or altogether anodal connection
Figure DEST_PATH_728157DEST_PATH_IMAGE002
the positive pole of road direct supply voltage over the ground
Figure DEST_PATH_DEST_PATH_IMAGE020
;
The 3rd step, by the first switch S closure, again detect the negative pole of the M road direct supply that altogether negative pole connects or anodal connection altogether
Figure DEST_PATH_690297DEST_PATH_IMAGE002
the positive pole of road direct supply voltage over the ground
Figure DEST_PATH_DEST_PATH_IMAGE022
;
The 4th step, calculating are total to negative pole connection
Figure DEST_PATH_318724DEST_PATH_IMAGE002
road direct supply or the altogether anodal M road direct supply connecting insulation impedance over the ground
Figure DEST_PATH_DEST_PATH_IMAGE024
:
Figure DEST_PATH_DEST_PATH_IMAGE026
（1）
The derivation of formula (1) is:
When the first switch S remains open, the negative pole of detection direct supply voltage over the ground
Figure DEST_PATH_181245DEST_PATH_IMAGE020
, according to circuit Kirchhoff's law, there is equation:
Figure DEST_PATH_DEST_PATH_IMAGE028
（2）
When after the first switch S closure, have:
Figure DEST_PATH_DEST_PATH_IMAGE030
（3）
In formula (3),
Figure DEST_PATH_DEST_PATH_IMAGE032
for after switch closes S and closes
Figure DEST_PATH_604136DEST_PATH_IMAGE014
the voltage at two ends.
Simultaneously known:
Figure DEST_PATH_DEST_PATH_IMAGE034
（4）
Therefore, have:
Figure DEST_PATH_DEST_PATH_IMAGE036
（5）
By formula (2), formula (3) is subtracted each other, and can obtain:
Figure DEST_PATH_DEST_PATH_IMAGE038
（6）
Bring formula (5) into formula (6), and simplify, can obtain:
Figure DEST_PATH_DEST_PATH_IMAGE040
(7), be required insulation impedance
Figure DEST_PATH_53572DEST_PATH_IMAGE024
.Determine comparison according to result of calculation and examination criteria setting, judge that whether system insulating resistance is abnormal.Known by formula (7) is analyzed, can draw the following conclusions:
The first, than additive method, algorithm that the utility model is carried only need to gather respectively a voltage signal according to the open and close of the first switch S, in conjunction with known external resistor resistance can calculate insulation resistance
Figure DEST_PATH_376285DEST_PATH_IMAGE024
.Than other detection methods, greatly reduce sampled signal quantity and processor resource and taken;
The second, insulation resistance calculates only needs a division calculation.And division calculation resource consumption in digital signal processor is larger, therefore can greatly reduce the computation burden of digital signal processor.
Three, insulation resistance precision is only followed voltage voltage sample precision and institute's external resistor
Figure DEST_PATH_782176DEST_PATH_IMAGE004
precision relevant.
According to above analysis, for improving insulation resistance detecting precision, improving external resistor
Figure DEST_PATH_519450DEST_PATH_IMAGE004
on the basis of precision, only need to improve voltage
Figure DEST_PATH_530132DEST_PATH_IMAGE020
detecting precision.For this reason, on Fig. 4 circuit base, increase resistance and resistance
Figure DEST_PATH_656536DEST_PATH_IMAGE010
, resistance
Figure DEST_PATH_368140DEST_PATH_IMAGE008
and resistance after series connection, and between ground and negative pole, as shown in Figure 5, gather resistance
Figure DEST_PATH_434502DEST_PATH_IMAGE010
both end voltage is carried out insulation resistance calculating.For reducing the impact of parallel resistance on system, resistance
Figure DEST_PATH_17931DEST_PATH_IMAGE008
and resistance
Figure DEST_PATH_267646DEST_PATH_IMAGE010
can select resistance to be far longer than the resistance of insulation resistance protection setting value, as resistance more than 5M, can adjust resistance simultaneously and resistance
Figure DEST_PATH_624995DEST_PATH_IMAGE010
ratio, adjust voltage sample scope, by the reduction of voltage sample scope, under voltage sample and the same condition for the treatment of circuit, can improve the sampling precision of the analog to digital passage of digital signal processor, thereby improve the precision of voltage sample.
Embodiment 2
In mimic channel, mostly adopt differential resistor sample mode, as shown in Figure 5, comprise resistance R 0
Resistance R 1, capacitor C and operational amplifier, its input signal is Vin.Less in input voltage vin, the sampling error causing due to parameters such as resistance precision, operational amplifier offset electric currents is larger.Therefore for wide input voltage range straight-flow system in, if adopt the test circuit in embodiment 1, if Rn much smaller than Rp, Vn is less, voltage sample error is larger, thereby causes insulation resistance detecting inaccurate.
Forbidden for solving above-mentioned voltage sample the larger situation of insulation resistance detecting error causing, on the basis of Fig. 4, the present embodiment is made design improvement, as shown in Figure 6, has increased diode D1, D2 ... Dm, and resistance R a and second switch Sa.The resistance of the resistance of resistance R a and resistance R 0 is suitable, when after second switch Sa closure, even if Rn much smaller than Rp, also can make Rn two ends get larger voltage, thereby improves detecting precision.
Figure DEST_PATH_DEST_PATH_IMAGE042
for Ra both end voltage,
Figure DEST_PATH_DEST_PATH_IMAGE044
.
The disclosed a kind of multichannel input DC power insulation impedance method for detecting of the present embodiment, the steps include:
The first step, build multichannel input DC power insulation impedance circuit for detecting;
Second step, when the first switch S remains open, closed second switch Sa, it is right safely to detect
Figure DEST_PATH_262431DEST_PATH_IMAGE002
the voltage of road DC power cathode , can obtain according to kirchhoff's principle:
Figure DEST_PATH_DEST_PATH_IMAGE046
（7）
The 3rd step, by the first switch (S) closure, again detect that negative pole altogether connects
Figure DEST_PATH_217935DEST_PATH_IMAGE002
the negative pole of road direct supply voltage over the ground
Figure DEST_PATH_698594DEST_PATH_IMAGE022
, in like manner can obtain:
（8）
The 4th step, calculating are total to negative pole connection
Figure DEST_PATH_53352DEST_PATH_IMAGE002
the positive pole of road direct supply insulation impedance over the ground
Figure DEST_PATH_910450DEST_PATH_IMAGE024
:
By (7)-(8) Shi Ke get:
Figure DEST_PATH_DEST_PATH_IMAGE050
, have:
Figure DEST_PATH_DEST_PATH_IMAGE052
（9）。
Below in conjunction with the photovoltaic DC-to-AC converter of two-way input, the concrete use of circuit and algorithm is proposed by place of matchmakers.Conventional photovoltaic DC-to-AC converter is made up of DC/DC circuit and inverter circuit, and the insulation impedance circuit of solar battery array is generally placed on input side, and inverter need to be at grid-connected this insulation resistance of front detecting, and with setting value comparison.Typical booster circuit as shown in Figure 7.Circuit is made up of two conventional BOOST booster circuits, negative pole altogether, and Rp1, Rp2 is anodal insulation against ground resistance, Rn is negative pole insulation against ground resistance.Improve precision insulation impedance circuit for detecting by R0 and S0, Ra and Sa composition.Diode in Fig. 6 can share output commutation diode D1 and the D2 in BOOST circuit.Ra value and R0 value are suitable.
First inverter controls second switch Sa closure, detecting Rn both end voltage
Figure DEST_PATH_667053DEST_PATH_IMAGE020
; Secondly, control the first switch S closure by R0 place in circuit, again detect Rn both end voltage
Figure DEST_PATH_318615DEST_PATH_IMAGE022
, can be calculated insulation resistance Rp1 by (9) formula, the parallel connection value of Rp2 and Rn.

Claims (6)

1. a high-precision multichannel direct supply insulating resistor detecting circuit altogether, comprises road direct supply,
Figure DEST_PATH_965278DEST_PATH_IMAGE002
road direct supply altogether negative pole connects or anodal connection altogether, it is characterized in that: if
Figure DEST_PATH_787741DEST_PATH_IMAGE002
road direct supply altogether negative pole connects, between the negative pole of direct supply and ground and connect the resistance of connecting
Figure 126869DEST_PATH_DEST_PATH_IMAGE004
and first switch (S);
If
Figure DEST_PATH_117091DEST_PATH_IMAGE002
road direct supply is anodal connection altogether, between the positive pole of direct supply and ground and connect the resistance of connecting
Figure DEST_PATH_315991DEST_PATH_IMAGE004
and first switch (S).
2. the high-precision multichannel of one as claimed in claim 1 direct supply insulating resistor detecting circuit altogether, is characterized in that: if
Figure DEST_PATH_299384DEST_PATH_IMAGE002
road direct supply altogether negative pole connects, and the positive pole of Ze Mei road direct supply connects respectively the anode of a diode, the equal contact resistance of negative electrode of all diodes
Figure 906606DEST_PATH_DEST_PATH_IMAGE006
one end, resistance other end serial connection second switch (Sa) after ground connection, resistance
Figure DEST_PATH_109394DEST_PATH_IMAGE006
resistance and described resistance
Figure DEST_PATH_659455DEST_PATH_IMAGE004
resistance suitable.
3. the high-precision multichannel of one as claimed in claim 2 direct supply insulating resistor detecting circuit altogether, is characterized in that: described resistance
Figure DEST_PATH_182840DEST_PATH_IMAGE004
or described resistance
Figure DEST_PATH_612685DEST_PATH_IMAGE006
be the independent resistance of a resistance composition, or be at least two equivalent resistances that resistance serial or parallel connection forms.
4. the high-precision multichannel of one as claimed in claim 2 direct supply insulating resistor detecting circuit altogether, is characterized in that: at the resistance of described series connection
Figure DEST_PATH_916627DEST_PATH_IMAGE004
and the two ends of the first switch (S) connect the resistance of series connection
Figure 177181DEST_PATH_DEST_PATH_IMAGE008
and resistance
Figure 991554DEST_PATH_DEST_PATH_IMAGE010
; Described diode or be to increase separately, or diode in multiplexing circuit under test.
5. the high-precision multichannel of one as claimed in claim 4 direct supply insulating resistor detecting circuit altogether, is characterized in that: described resistance
Figure DEST_PATH_503335DEST_PATH_IMAGE008
and described resistance
Figure DEST_PATH_146806DEST_PATH_IMAGE010
all select resistance to be greater than the resistance of insulation resistance protection threshold values, this resistance
Figure DEST_PATH_481972DEST_PATH_IMAGE008
and resistance for individual resistors, or it is the equivalent resistance of multiple resistance series connection.
6. the high-precision multichannel of one as claimed in claim 2 direct supply insulating resistor detecting circuit altogether, is characterized in that: described the first switch (S) or described second switch (Sa) are gate-controlled switch, or are hand switch.
CN201320481819.5U 2013-05-15 2013-08-07 High accuracy multipath common-ground DC power supply insulation resistor detection circuit Expired - Lifetime CN203688665U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103630745A (en) * 2013-05-15 2014-03-12 上海正泰电源系统有限公司 High-precision multi-path common-grounded direct-current power supply insulation resistance detection circuit and method
CN105606897A (en) * 2015-12-28 2016-05-25 哈密创动科技有限公司 Branch insulating impedance monitoring and PV power generation method, inverter and PV power generation system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103630745A (en) * 2013-05-15 2014-03-12 上海正泰电源系统有限公司 High-precision multi-path common-grounded direct-current power supply insulation resistance detection circuit and method
CN105606897A (en) * 2015-12-28 2016-05-25 哈密创动科技有限公司 Branch insulating impedance monitoring and PV power generation method, inverter and PV power generation system

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