CN106841804B - Insulation impedance detection circuit and detection method - Google Patents
Insulation impedance detection circuit and detection method Download PDFInfo
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Abstract
The invention discloses an insulation resistance detection circuit and a detection method, wherein the detection circuit comprises a ground resistance of a system to be detected, a grounding relay, an equivalent resistance of a sampling circuit to a sampling reference ground, a DC + sampling reference ground voltage sampling circuit, a DC + to sampling reference ground switching component, a DC-to sampling reference ground switching component and a DC + and DC-to-DC voltage sampling circuit; before the insulation impedance detection, the equivalent impedance of a sampling circuit to the ground is detected; the equivalent impedance is brought into a detection algorithm during insulation impedance detection, a static error caused by system difference is eliminated in an automatic correction mode, the sampling balance resistor is dynamically switched according to the external impedance, and the phenomenon that insulation impedance detection is inaccurate when the single-end ground impedance is infinite is solved.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of energy and electric automobiles, and relates to an insulation resistance detection circuit and a detection method.
[ background of the invention ]
With the popularization of electric vehicles, charging safety, particularly safety of dc charging, has been the focus of attention. It is also clearly specified in the national standard that before the electric vehicle is charged by direct current, the charging pile and the vehicle must be subjected to insulation resistance detection before the direct current charging, and if the detected insulation resistance value is smaller than a specified threshold value, the charging is forbidden so as to prevent personal injury or equipment damage caused by the ground leakage.
The detection parameters of the conventional insulation resistance detection circuit are generally solidified in an algorithm, but static errors are introduced when the insulation resistance is calculated due to different degrees of static errors existing in the factory of a sampling device, so that the detection of the insulation resistance is inaccurate.
Aiming at the problem of inaccurate insulation resistance detection in the prior art, no effective solution is provided at present.
[ summary of the invention ]
The present invention is directed to overcome the above disadvantages of the prior art, and provides an insulation resistance detection circuit and a detection method, which solve the problem of inaccurate insulation resistance detection in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
an insulation impedance detection circuit comprises a ground impedance (1) of a tested system, a grounding relay (2), a sampling circuit equivalent impedance (3) to a sampling reference ground, a DC + sampling circuit (4) to the sampling reference ground, a DC + switching component (5) to the sampling reference ground, a DC-to-sampling reference switching component (6) and a DC + and DC-to-DC voltage sampling circuit (7); wherein the content of the first and second substances,
the system to be tested comprises a positive earth impedance Rx and a negative earth impedance Ry which are connected in series, wherein one end of the positive earth impedance Rx is connected with DC +, one end of the negative earth impedance Ry is connected with DC-, the other end of the positive earth impedance Rx is connected with the other end of the negative earth impedance Ry, and the connecting node is connected with the earth ground PE;
one end of a switch K1 in the grounding relay (2) is connected with the ground PE, and the other end is connected with a sampling reference ground GND;
the sampling circuit equivalent impedance (3) to the sampling reference ground comprises an equivalent resistance R1 of DC + to the sampling reference ground and an equivalent resistance R2 of DC-to the sampling reference ground, one end of the equivalent resistance R1 of DC + to the sampling reference ground is connected with DC +, and one end of the equivalent resistance R2 of DC-to the sampling reference ground is connected with DC-; the other end of the equivalent resistor R1 of the DC plus pair of sampling reference grounds is connected with the other end of the equivalent resistor R2 of the DC minus pair of sampling reference grounds, and the connecting node is connected with the sampling reference ground GND;
a DC + sampling reference ground voltage sampling circuit (4) coupled across an equivalent resistance R1 of DC + sampling reference ground;
the DC plus to the sampling reference ground switching component (5) includes the first balancing resistance R3 and the first fling-cut switch K2 connected in series, one end of the first balancing resistance R3 connects DC plus, one end of the first fling-cut switch K2 connects the sampling reference ground GND;
the DC-to-sampling reference ground switching component (6) comprises a second balance resistor R4 and a second switching switch K3 which are connected in series, one end of the second balance resistor R4 is connected with DC +, and one end of the second switching switch K3 is connected with a sampling reference ground GND.
The invention further improves the following steps:
the DC + sampling reference ground voltage sampling circuit (4) adopts a differential voltage sampling circuit or a voltage division circuit.
The first switching switch K2 and the second switching switch K3 are respectively one of a relay, an MOS (metal oxide semiconductor) tube or an IGBT.
The DC + and DC-between voltage sampling circuit (7) adopts an isolation type differential voltage sampling circuit or a non-isolation type differential voltage sampling circuit.
A detection method adopting an insulation resistance detection circuit comprises the following steps:
step 1), under the condition that a switch K1 in the grounding relay (2) is disconnected, according to the detected voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the detected voltage on the equivalent resistor R2 with DC-to the sampling reference ground, determining the resistance value of the equivalent resistor R1 with DC + to the sampling reference ground and the resistance value of the equivalent resistor R2 with DC-to the sampling reference ground;
and 2) under the condition that a switch K1 in the grounding relay (2) is closed, dynamically switching the balance resistor according to the size relation between the detected voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the detected voltage on the equivalent resistor R2 with DC-to the sampling reference ground, and combining the determined resistance value of the equivalent resistor R1 with DC + to the sampling reference ground and the determined resistance value of the equivalent resistor R2 with DC-to the sampling reference ground to obtain the insulation resistance.
The invention further improves the following steps:
the step 1) is specifically as follows:
step 1-1), the switch K1 is turned off, the first switch K2 is turned off, the second switch K3 is turned off, and the voltage across the equivalent resistor R1 with DC + to the sampling reference ground and the voltage across the equivalent resistor R2 with DC-to the sampling reference ground are read and recorded as Up1 and Un 1;
step 1-2), the switch K1 is switched off, the first fling-cut switch K2 is attracted, the second fling-cut switch K3 is switched off, and the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC + to the sampling reference ground are read and recorded as Up2 and Un 2;
step 1-3), calculating the resistance of the equivalent resistance R1 of DC + to the sampling reference ground and the resistance of the equivalent resistance R2 of DC-to the sampling reference ground according to the formula (1):
the switching state of the first switching switch K2 reflects the switching of the first balance resistor R3, the switching state of the second switching switch K3 reflects the switching of the second balance resistor R4, the balance resistors comprise a first balance resistor R3 and a second balance resistor R4, and the resistance value of the first balance resistor R3 is the same as that of the second balance resistor R4.
The step 2) is specifically as follows:
step 2-1), closing a switch K1, disconnecting a first switching switch K2 and a second switching switch K3, reading the voltage on an equivalent resistor R1 of DC + to a sampling reference ground and the voltage on an equivalent resistor R2 of DC-to the sampling reference ground, and recording the voltages as Ur1 and Ur 2;
step 2-2), judging the size relationship between Ur1 and Ur2,
if Ur1 ≧ Ur2, step 3) is performed, namely measurement mode one is entered,
if Ur1 < Ur2, executing step 4), namely entering a measurement mode two;
step 3), a first measurement mode:
step 3-1), attracting the first fling-cut switch K2, reading the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC-to the sampling reference ground, and recording the voltages as Up3 and Un 3;
step 3-2), attracting the first switch K2, attracting the second switch K3, reading the voltage on the equivalent resistor R1 of DC + to the sampling reference ground and the voltage on the equivalent resistor R2 of DC-to the sampling reference ground, and recording as Up4 and Un 4;
step 3-3), disconnecting the switch K1, the first fling-cut switch K2 and the second fling-cut switch K3;
step 3-4), calculating by formula (2):
wherein the first parallel resistor Rtemp1Is a reaction with R1And R3The equivalent resistors with the same resistance value after being connected in parallel, a second parallel resistor Ra1Is a reaction with RxAnd Rtemp1The equivalent resistors with the same resistance after being connected in parallel, and a third parallel resistor Rb1Is a reaction with RyAnd R2Equivalent resistors with the same resistance value after being connected in parallel;
derived from equation (2) is calculated:
finally, calculating:
step 4), a second measurement mode:
step 4-1), the second switch K3 is closed, the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC-to the sampling reference ground are read and recorded as Up5 and Un 5;
step 4-2), attracting the first switch K2, attracting the second switch K3, reading the voltage on the equivalent resistor R1 of DC + to the sampling reference ground and the voltage on the equivalent resistor R2 of DC-to the sampling reference ground, and recording as Up6 and Un 6;
step 4-3), disconnecting the switch K1, the first fling-cut switch K2 and the second fling-cut switch K3;
step 4-4), calculating by the formula (3):
wherein, the fourth parallel resistor Ra2Is a reaction with RxAnd R1The equivalent resistor with the same resistance value after being connected in parallel, a fifth parallel resistor Rtemp2Is a reaction with R2And R3The equivalent resistor with the same resistance value after being connected in parallel, a sixth parallel resistor Rb2Is a reaction with RyAnd Rtemp2Equivalent resistors with the same resistance value after being connected in parallel;
derived from equation (3) is calculated:
finally, calculating:
compared with the prior art, the invention has the following beneficial effects:
before the insulation impedance detection, the equivalent impedance of a sampling circuit to the ground is detected; the equivalent impedance is brought into a detection algorithm during insulation impedance detection, and a static error caused by system difference is eliminated in an automatic correction mode. The sampling balance resistor is dynamically switched according to the external impedance, and the phenomenon that insulation impedance detection is inaccurate when the single-end impedance to the ground is infinite is solved.
[ description of the drawings ]
Fig. 1 is a schematic diagram of an insulation resistance detection circuit according to the present invention;
fig. 2 is a schematic diagram of an insulation resistance detection circuit according to the present invention.
Wherein: 1-impedance of the system under test to earth; 2-a ground relay; 3-sampling circuit to sample reference equivalent impedance; 4-DC + sampling circuit to sampling reference ground voltage; 5-DC + ground switching component for sampling reference; 6-DC-to-sampling reference ground switching component; 7-DC + and DC-between voltage sampling circuit.
[ detailed description ] embodiments
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 and fig. 2, the present invention provides an embodiment of an insulation resistance detection circuit, that is, an embodiment of an insulation resistance detection circuit for self-correcting system sampling resistance, the detection circuit includes a system to be tested to ground resistance 1, a grounding relay 2, a sampling circuit to sampling reference ground equivalent resistance 3, a DC + to sampling reference ground voltage sampling circuit 4, a DC + to sampling reference ground switching component 5, a DC-to sampling reference ground switching component 6, and a DC + to DC-to-DC voltage sampling circuit 7.
The system to be tested comprises a positive earth impedance Rx and a negative earth impedance Ry which are connected in series, wherein one end of the positive earth impedance Rx is connected with DC +, one end of the negative earth impedance Ry is connected with DC-, the other end of the positive earth impedance Rx is connected with the other end of the negative earth impedance Ry, and a connection node is connected with the earth ground PE;
one end of a switch K1 in the grounding relay 2 is connected with the ground PE, and the other end is connected with a sampling reference ground GND;
the sampling circuit equivalent resistance to the sampling reference ground 3 comprises an equivalent resistance R1 of DC plus to the sampling reference ground and an equivalent resistance R2 of DC minus to the sampling reference ground, one end of the equivalent resistance R1 of DC plus to the sampling reference ground is connected with DC plus, and one end of the equivalent resistance R2 of DC minus to the sampling reference ground is connected with DC minus; the other end of the equivalent resistor R1 of the DC plus pair of sampling reference grounds is connected with the other end of the equivalent resistor R2 of the DC minus pair of sampling reference grounds, and the connecting node is connected with the sampling reference ground GND;
it should be noted that R1 and R2 in the above embodiments are impedances introduced by system sampling circuits, both are equivalent impedances, and do not exist in an actual circuit, R1 and R2 are related to parameters of the sampling circuit (such as DC + sampling reference ground voltage sampling circuit 4 in fig. 1) and a system sampling mode, the same sampling circuit is used in different sampling systems, and R1 and R2 may be different;
a DC + sampling reference ground voltage sampling circuit 4 is connected in parallel to two ends of an equivalent resistance R1 of the DC + sampling reference ground; the DC + pair sampling reference ground voltage sampling circuit 4 adopts a differential voltage sampling circuit or a voltage dividing circuit for sampling a voltage across an equivalent resistance R1 of the DC + pair sampling reference ground, i.e., a voltage of the DC + pair sampling reference ground.
The DC plus sampling reference ground switching component 5 comprises a first balance resistor R3 and a first switching switch K2 which are connected in series, wherein one end of the first balance resistor R3 is connected with DC plus, and one end of the first switching switch K2 is connected with sampling reference ground GND;
the DC-to-sampling reference ground switching component 6 comprises a second balance resistor R4 and a second switch K3 which are connected in series, wherein one end of the second balance resistor R4 is connected to DC +, and one end of the second switch K3 is connected to the sampling reference ground GND. The first switching switch K2 and the second switching switch K3 can adopt power electronic switching devices such as relays, MOS (metal oxide semiconductor) tubes or IGBTs (insulated gate bipolar transistors) and the like; the values of the balancing resistors (including the first balancing resistor R3 and the second balancing resistor R4) are related to the designed system sampling impedance, and are typically in the order of hundreds of k Ω.
The DC + and DC-between voltage sampling circuit 7 adopts an isolated differential voltage sampling circuit or a non-isolated differential voltage sampling circuit, i.e. the voltage sampling circuit between DC + and DC-is a differential voltage sampling circuit, can be in an isolated sampling or non-isolated sampling form, and is used for sampling the voltage between DC + and DC-.
The invention also provides an embodiment of an insulation resistance detection method, namely an embodiment of the insulation resistance detection method for self-correcting system sampling resistance, which comprises the following steps:
1) under the condition that a switch K1 in the grounding relay 2 is switched off, determining the resistance value of the equivalent resistor R1 of the DC + to the sampling reference ground and the resistance value of the equivalent resistor R2 of the DC-to the sampling reference ground according to the detected voltage on the equivalent resistor R1 of the DC + to the sampling reference ground and the detected voltage on the equivalent resistor R2 of the DC-to the sampling reference ground; before the absolute impedance detection is performed, the values of the equivalent resistance R1 of DC + to the sampling reference ground and the equivalent resistance R2 of DC-to the sampling reference ground are dynamically detected, and the specific method is as follows:
1-1) the switch K1 is turned off, the first switch K2 is turned off, the second switch K3 is turned off, and the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC-to the sampling reference ground are read and recorded as Up1 and Un 1;
1-2) the switch K1 is disconnected, the first fling-cut switch K2 is attracted, the second fling-cut switch K3 is disconnected, and the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC-to the sampling reference ground are read and recorded as Up2 and Un 2;
1-3) calculating the resistance value of the equivalent resistance R1 of DC + to the sampling reference ground and the resistance value of the equivalent resistance R2 of DC-to the sampling reference ground according to the formula (1):
the switching state of the first switching switch K2 reflects the switching of the first balance resistor R3, the switching state of the second switching switch K3 reflects the switching of the second balance resistor R4, the balance resistors comprise a first balance resistor R3 and a second balance resistor R4, and the resistance value of the first balance resistor R3 is the same as that of the second balance resistor R4.
The step is used for dynamically monitoring the sampling impedance of the system, and the sampling impedance is brought into the sampling system according to the actually calculated R1 and R2, so that static errors caused by system differences can be dynamically corrected through the real-time obtained R1 and R2, and accurate detection of the insulation impedance is realized.
2) Under the condition that a switch K1 in the grounding relay 2 is closed, dynamically switching a balance resistor according to the size relation between the detected voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the detected voltage on the equivalent resistor R2 with DC-to the sampling reference ground, and combining the determined resistance value of the equivalent resistor R1 with DC + to the sampling reference ground and the determined resistance value of the equivalent resistor R2 with DC-to the sampling reference ground to obtain the insulation resistance; namely, the insulation resistance detection is carried out by the following specific method:
2-1) attracting a switch K1, disconnecting a first switching switch K2 and a second switching switch K3, reading voltages on an equivalent resistor R1 of DC + to a sampling reference ground and an equivalent resistor R2 of DC-to the sampling reference ground, and recording the voltages as Ur1 and Ur 2;
2-2) the magnitudes of Ur1 and Ur2 are in direct proportional relationship with the magnitudes of the positive earth impedance Rx and the negative earth impedance Ry, since DC + equivalent resistance R1 to the sampling reference ground and DC-equivalent resistance R2 to the sampling reference ground are determined; according to the magnitude of Ur1 and Ur2, the magnitude of positive earth impedance Rx and negative earth impedance Ry is preliminarily judged, and for the side with large resistance, corresponding balance resistance is connected in parallel, so that the condition that Ur1> > Ur2 or Ur2> > Ur1 can be avoided;
judging the size relationship between Ur1 and Ur2, if Ur1 is not less than Ur2, executing step 3), namely entering a measurement mode I, and if Ur1 is less than Ur2, executing step 4), namely entering a measurement mode II;
3) the first measurement mode is as follows:
3-1) attracting by a first fling-cut switch K2, reading the voltage on an equivalent resistor R1 with DC + to a sampling reference ground and the voltage on an equivalent resistor R2 with DC-to the sampling reference ground, and recording as Up3 and Un 3;
3-2) attracting the first switch K2 and attracting the second switch K3, reading the voltage on the equivalent resistor R1 of DC + to the sampling reference ground and the voltage on the equivalent resistor R2 of DC-to the sampling reference ground, and recording the voltages as Up4 and Un 4;
3-3) disconnecting a switch K1, a first switching switch K2 and a second switching switch K3;
3-4) calculating by formula (2):
wherein the first parallel resistor Rtemp1Is a reaction with R1And R3The equivalent resistors with the same resistance value after being connected in parallel, a second parallel resistor Ra1Is a reaction with RxAnd Rtemp1The equivalent resistors with the same resistance after being connected in parallel, and a third parallel resistor Rb1Is a reaction with RyAnd R2Equivalent resistors with the same resistance value after being connected in parallel;
derived from equation (2) is calculated:
finally, calculating:
4) and a second measurement mode:
4-1) the second switch K3 is attracted, and the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC-to the sampling reference ground are read and recorded as Up5 and Un 5;
4-2) attracting the first switch K2, attracting the second switch K3, reading the voltage on the equivalent resistor R1 of DC + to the sampling reference ground and the voltage on the equivalent resistor R2 of DC-to the sampling reference ground, and recording as Up6 and Un 6;
4-3) disconnecting a switch K1, a first switching switch K2 and a second switching switch K3;
4-4) calculating by formula (3):
wherein, the fourth parallel resistor Ra2Is a reaction with RxAnd R1The equivalent resistor with the same resistance value after being connected in parallel, a fifth parallel resistor Rtemp2Is a reaction with R2And R3The equivalent resistor with the same resistance value after being connected in parallel, a sixth parallel resistor Rb2Is a reaction with RyAnd Rtemp2Equivalent resistors with the same resistance value after being connected in parallel;
derived from equation (3) is calculated:
finally, calculating:
according to the scheme, the positive earth impedance Rx and the negative earth impedance Ry are preliminarily judged according to the voltage signal, the balance resistor is dynamically switched, and the accurate insulation impedance is calculated by combining the R1 and the R2 which are obtained through real-time calculation under different switching states through the size relation between the positive earth impedance Rx and the negative earth impedance Ry, so that the condition that personal safety accidents or equipment loss are caused due to inaccurate insulation detection is prevented.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (7)
1. An insulation impedance detection circuit is characterized by comprising a ground impedance (1) of a tested system, a grounding relay (2), a sampling circuit equivalent impedance (3) to a sampling reference ground, a DC + sampling reference ground voltage sampling circuit (4), a DC + switching component (5) to the sampling reference ground, a DC-switching component (6) to the sampling reference ground and a DC + and DC-between voltage sampling circuit (7); wherein the content of the first and second substances,
the system to be tested comprises a positive earth impedance Rx and a negative earth impedance Ry which are connected in series, wherein one end of the positive earth impedance Rx is connected with DC +, one end of the negative earth impedance Ry is connected with DC-, the other end of the positive earth impedance Rx is connected with the other end of the negative earth impedance Ry, and the connecting node is connected with the earth ground PE;
one end of a switch K1 in the grounding relay (2) is connected with the ground PE, and the other end is connected with a sampling reference ground GND;
the sampling circuit equivalent impedance (3) to the sampling reference ground comprises an equivalent resistance R1 of DC + to the sampling reference ground and an equivalent resistance R2 of DC-to the sampling reference ground, one end of the equivalent resistance R1 of DC + to the sampling reference ground is connected with DC +, and one end of the equivalent resistance R2 of DC-to the sampling reference ground is connected with DC-; the other end of the equivalent resistor R1 which is DC plus to the sampling reference ground is connected with the other end of the equivalent resistor R2 which is DC minus to the sampling reference ground, and the connecting node is connected with the sampling reference ground GND, wherein the equivalent resistor R1 which is DC plus to the sampling reference ground and the equivalent resistor R2 which is DC minus to the sampling reference ground are equivalent impedances introduced by the system sampling circuit;
a DC + sampling reference ground voltage sampling circuit (4) coupled across an equivalent resistance R1 of DC + sampling reference ground;
the DC plus to the sampling reference ground switching component (5) includes the first balancing resistance R3 and the first fling-cut switch K2 connected in series, one end of the first balancing resistance R3 connects DC plus, one end of the first fling-cut switch K2 connects the sampling reference ground GND;
the DC-to-sampling reference ground switching component (6) comprises a second balance resistor R4 and a second switching switch K3 which are connected in series, one end of the second balance resistor R4 is connected with DC +, and one end of the second switching switch K3 is connected with a sampling reference ground GND.
2. The insulation resistance detection circuit according to claim 1, wherein the DC + sampling reference ground voltage sampling circuit (4) employs a differential voltage sampling circuit or a voltage dividing circuit.
3. The insulation resistance detection circuit according to claim 1, wherein the first switching switch K2 and the second switching switch K3 are respectively one of a relay, a MOS transistor or an IGBT.
4. The insulation resistance detection circuit according to claim 1, wherein the DC + and DC-to-DC voltage sampling circuit (7) employs an isolated differential voltage sampling circuit or a non-isolated differential voltage sampling circuit.
5. A method of testing using the insulation resistance test circuit according to any one of claims 1 to 4, comprising the steps of:
step 1), under the condition that a switch K1 in the grounding relay (2) is disconnected, according to the detected voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the detected voltage on the equivalent resistor R2 with DC-to the sampling reference ground, determining the resistance value of the equivalent resistor R1 with DC + to the sampling reference ground and the resistance value of the equivalent resistor R2 with DC-to the sampling reference ground;
and 2) under the condition that a switch K1 in the grounding relay (2) is closed, dynamically switching the balance resistor according to the size relation between the detected voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the detected voltage on the equivalent resistor R2 with DC-to the sampling reference ground, and combining the determined resistance value of the equivalent resistor R1 with DC + to the sampling reference ground and the determined resistance value of the equivalent resistor R2 with DC-to the sampling reference ground to obtain the insulation resistance.
6. The detection method of the insulation resistance detection circuit according to claim 5, wherein the step 1) is specifically:
step 1-1), the switch K1 is turned off, the first switch K2 is turned off, the second switch K3 is turned off, and the voltage across the equivalent resistor R1 with DC + to the sampling reference ground and the voltage across the equivalent resistor R2 with DC-to the sampling reference ground are read and recorded as Up1 and Un 1;
step 1-2), the switch K1 is switched off, the first fling-cut switch K2 is attracted, the second fling-cut switch K3 is switched off, and the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC + to the sampling reference ground are read and recorded as Up2 and Un 2;
step 1-3), calculating the resistance of the equivalent resistance R1 of DC + to the sampling reference ground and the resistance of the equivalent resistance R2 of DC-to the sampling reference ground according to the formula (1):
the switching state of the first switching switch K2 reflects the switching of the first balance resistor R3, the switching state of the second switching switch K3 reflects the switching of the second balance resistor R4, the balance resistors comprise a first balance resistor R3 and a second balance resistor R4, and the resistance value of the first balance resistor R3 is the same as that of the second balance resistor R4.
7. The detection method of the insulation resistance detection circuit according to claim 6, wherein the step 2) is specifically:
step 2-1), closing a switch K1, disconnecting a first switching switch K2 and a second switching switch K3, reading the voltage on an equivalent resistor R1 of DC + to a sampling reference ground and the voltage on an equivalent resistor R2 of DC-to the sampling reference ground, and recording the voltages as Ur1 and Ur 2;
step 2-2), judging the size relationship between Ur1 and Ur2,
if Ur1 ≧ Ur2, step 3) is performed, namely measurement mode one is entered,
if Ur1 < Ur2, executing step 4), namely entering a measurement mode two;
step 3), a first measurement mode:
step 3-1), attracting the first fling-cut switch K2, reading the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC-to the sampling reference ground, and recording the voltages as Up3 and Un 3;
step 3-2), attracting the first switch K2, attracting the second switch K3, reading the voltage on the equivalent resistor R1 of DC + to the sampling reference ground and the voltage on the equivalent resistor R2 of DC-to the sampling reference ground, and recording as Up4 and Un 4;
step 3-3), disconnecting the switch K1, the first fling-cut switch K2 and the second fling-cut switch K3;
step 3-4), calculating by formula (2):
wherein the first parallel resistor Rtemp1Is a reaction with R1And R3The equivalent resistors with the same resistance value after being connected in parallel, a second parallel resistor Ra1Is a reaction with RxAnd Rtemp1The equivalent resistors with the same resistance after being connected in parallel, and a third parallel resistor Rb1Is a reaction with RyAnd R2Equivalent resistors with the same resistance value after being connected in parallel;
derived from equation (2) is calculated:
finally, calculating:
step 4), a second measurement mode:
step 4-1), the second switch K3 is closed, the voltage on the equivalent resistor R1 with DC + to the sampling reference ground and the voltage on the equivalent resistor R2 with DC-to the sampling reference ground are read and recorded as Up5 and Un 5;
step 4-2), attracting the first switch K2, attracting the second switch K3, reading the voltage on the equivalent resistor R1 of DC + to the sampling reference ground and the voltage on the equivalent resistor R2 of DC-to the sampling reference ground, and recording as Up6 and Un 6;
step 4-3), disconnecting the switch K1, the first fling-cut switch K2 and the second fling-cut switch K3;
step 4-4), calculating by the formula (3):
wherein, the fourth parallel resistor Ra2Is a reaction with RxAnd R1The equivalent resistor with the same resistance value after being connected in parallel, a fifth parallel resistor Rtemp2Is a reaction with R2And R3The equivalent resistor with the same resistance value after being connected in parallel, a sixth parallel resistor Rb2Is a reaction with RyAnd Rtemp2Equivalent resistors with the same resistance value after being connected in parallel;
derived from equation (3) is calculated:
finally, calculating:
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| CN201611118645.0A CN106841804B (en) | 2016-12-07 | 2016-12-07 | Insulation impedance detection circuit and detection method |
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| CN201611118645.0A CN106841804B (en) | 2016-12-07 | 2016-12-07 | Insulation impedance detection circuit and detection method |
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| CN110568366B (en) * | 2018-06-05 | 2022-02-11 | 广州小鹏汽车科技有限公司 | Insulation circuit, battery pack leakage detection method and hardware detection method |
| CN110456157B (en) * | 2019-09-02 | 2021-12-07 | 西安特锐德智能充电科技有限公司 | Insulation impedance detection method and device |
| CN110568372B (en) * | 2019-09-27 | 2022-05-27 | 安徽鸿创新能源动力有限公司 | Detection circuit and method for total voltage and insulation resistance of battery pack |
| CN111610411A (en) * | 2020-04-20 | 2020-09-01 | 华为技术有限公司 | Cable insulation impedance detection method and device |
| WO2022241648A1 (en) * | 2021-05-18 | 2022-11-24 | 深圳欣锐科技股份有限公司 | Bidirectional on-board charger insulation resistance measurement circuit and method |
| CN115856437B (en) * | 2022-12-30 | 2023-09-08 | 深圳优能新能源科技有限公司 | Method for detecting insulation resistance of high-voltage energy storage battery |
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