CN208109933U - A kind of insulating resistor detecting circuit - Google Patents
A kind of insulating resistor detecting circuit Download PDFInfo
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- CN208109933U CN208109933U CN201820352569.8U CN201820352569U CN208109933U CN 208109933 U CN208109933 U CN 208109933U CN 201820352569 U CN201820352569 U CN 201820352569U CN 208109933 U CN208109933 U CN 208109933U
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Abstract
The utility model discloses a kind of insulating resistor detecting circuits, including power module, including Insulation monitoring unit, partial pressure unit and matching unit；The Insulation monitoring unit includes the first insulation resistance and the second insulation resistance being connected in series, and the partial pressure unit includes the first divider resistance being sequentially connected in series, the second divider resistance, third divider resistance and the 4th divider resistance；The matching unit includes the first cooperation route being connected in series and the second cooperation route, and the first cooperation route includes the first build-out resistor and first switch being connected in series, and the second cooperation route includes the second build-out resistor being connected in series and second switch.The circuit makes the detection of vehicle insulation impedance be no longer influenced by the influence of vehicle parasitic capacitance, and test mode is simple, can be good at the requirement for meeting the vehicle power-on self-test stage.
Description
Technical field
The utility model relates to vehicle power supply control technology field more particularly to a kind of insulating resistor detecting circuits.
Background technique
Detecting the method for insulation resistance in the prior art is mainly low-frequency pulse input method；It wherein, is as shown in Figure 1 this
The circuit applied under method, wherein the circuit includes detection signal input part, for receiving digital quantity pulse signal；Benchmark
Voltage source, buffer, detection capacitor, voltage follower；The program, which belongs to, to be realized signal driving using buffer and provides simulation
Pulse signal is measured, allows the MCU voltage feedback signal that output end provides based on the feedback signal, to calculate insulation resistance
Resistance value.
But existing this circuit itself has a great impact for the parasitic capacitance between high-low pressure, once this parasitism
If capacitor is larger, the bigger error of entire BMS detection insulation resistance will lead to, while to reach stably measured exhausted for entire circuit
The time requirement of edge resistance be it is very long, be not able to satisfy the applying working condition of vehicle.
Utility model content
In order to solve the above-mentioned technical problem, the utility model provides a kind of insulating resistor detecting circuit, including power supply mould
Block, including Insulation monitoring unit, partial pressure unit and matching unit；The power module, Insulation monitoring unit, partial pressure unit and
It is connected in parallel with each other with unit；
The Insulation monitoring unit includes the first insulation resistance and the second insulation resistance being connected in series, the partial pressure unit
Including the first divider resistance, the second divider resistance, third divider resistance and the 4th divider resistance being sequentially connected in series；Described
The other end of the other end of one insulation resistance and the first divider resistance is connected with the anode of power module, second insulated electro
The other end of the other end of resistance and the 4th divider resistance is connected with the cathode of power module；
The matching unit includes the first cooperation route being connected in series and the second cooperation route, the first cooperation route
The first build-out resistor and first switch including series connection, the second cooperation route include the second matching electricity being connected in series
Resistance and second switch；The first cooperation route, simultaneously with the series circuit of first divider resistance and the second divider resistance phase
Connection；The second cooperation route, is in parallel with the series circuit of the third divider resistance and the 4th divider resistance.
Also, the series circuit of first insulation resistance and the second insulation resistance, the second divider resistance and third partial pressure
Series circuit between the series circuit of resistance and the first cooperation route and the second cooperation route is connected with ground path.
Further, the first insulation voltage is circumscribed on the series circuit of first divider resistance and the second divider resistance
Detector.
Further, the second insulation voltage is circumscribed on the series circuit of the third divider resistance and the 4th divider resistance
Detector.
Further, the first switch includes the first relay, and the second switch includes the second relay.
Further, the power module includes the battery modules of multiple series connections.
Further, the battery modules include the battery cell of multiple series connections.
Further, service switch is provided between the battery modules and the battery modules.
Insulating resistor detecting circuit provided by the utility model belongs to the insulating resistor detecting circuit of balance bridge method, can
It is accurate to obtain the first insulation resistance and the second insulation resistance, that is, battery pack positive and negative anodes are respectively for the insulation between vehicle ground
Resistance.This mode makes the detection of vehicle insulation impedance be no longer influenced by the influence of vehicle parasitic capacitance, entire circuit test mode
Simply, test data is accurate, can be good at the requirement for meeting the vehicle power-on self-test stage.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the insulating resistor detecting circuit under prior art state in battery management scheme；
Fig. 2 is insulating resistor detecting circuit provided by the utility model.
In figure：First divider resistance 1, the second divider resistance 2, third divider resistance 3, the 4th divider resistance 4, the first insulation
Resistance 5, the second insulation resistance 6, the first build-out resistor 7, first switch 8, the second build-out resistor 9, second switch 10.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are in the premise for not making creative work
Under every other embodiment obtained, fall within the protection scope of the utility model.
Wherein, the utility model is the insulating resistor detecting circuit for balancing bridge method, can make the inspection of vehicle insulation impedance
Survey is no longer influenced by the very big influence of vehicle parasitic capacitance, and is efficiently insulation resistance detection scheme.
Embodiment：
The utility model provides a kind of insulating resistor detecting circuit, including power module, including Insulation monitoring unit, point
Press unit and matching unit；The power module, Insulation monitoring unit, partial pressure unit and matching unit are connected in parallel with each other；
As shown in Fig. 2, the Insulation monitoring unit includes the first insulation resistance 5 (Rp) being connected in series and the second insulated electro
6 (Rn) are hindered, the partial pressure unit includes the first divider resistance 1 (R1) being sequentially connected in series, the second divider resistance 2 (R2), the
Three divider resistances 3 (R3) and the 4th divider resistance 4 (R4)；The other end of first insulation resistance 5 (Rp) and the first partial pressure electricity
The other end of 1 (R1) of resistance is connected with the anode of power module, the other end of second insulation resistance 6 (Rn) and the 4th partial pressure
The other end of resistance 4 (R4) is connected with the cathode of power module；
The matching unit includes the first cooperation route being connected in series and the second cooperation route, the first cooperation route
The first build-out resistor 7 (R5) and first switch 8 (T1) including series connection, the second cooperation route includes being connected in series
Second build-out resistor 9 (R6) and second switch 10 (T2)；It is described first cooperation route, with first divider resistance 1 (R1) and
The series circuit of second divider resistance 2 (R2) is in parallel；It is described second cooperation route, with the third divider resistance 3 (R3) and
The series circuit of 4th divider resistance 4 (R4) is in parallel.
Also, the series circuit of first insulation resistance 5 (Rp) and the second insulation resistance 6 (Rn), the second divider resistance 2
(R2) series line between the series circuit of third divider resistance 3 (R3) and the first cooperation route and the second cooperation route
Lu Junyu ground path is connected.
The first insulated electro is circumscribed on the series circuit of first divider resistance 1 (R1) and the second divider resistance 2 (R2)
Press detector.The second insulated electro is circumscribed on the series circuit of the third divider resistance 3 (R3) and the 4th divider resistance 4 (R4)
Press detector.
Wherein, the first switch 8 (T1) includes the first relay, and the second switch 10 (T2) includes the second relay
Device.
Further, the power module includes the battery modules of multiple series connections.The battery modules include multiple
The battery cell of series connection.And service switch is provided between the battery modules and the battery modules.
Principle explanation is given according to corresponding circuit framework figure Fig. 2 below：
Several detection circuits are connected between height piezoelectric battery, wherein Rp is battery pack anode to exhausted between vehicle ground
Edge resistance, Rn are battery pack cathode to the insulation resistance between vehicle body ground；Vp and Vn is detection network respectively in resistance detection net
The insulation voltage value that external voltage detector in network detects, wherein the two signals are to be delivered to BMS battery management system
In the detection circuit of low pressure side；It is matched with the build-out resistor network of T1, R5, R6 and T2 composition simultaneously, specific embodiment is such as
Shown in lower：
It is closed T1, disconnects T2：
Under this operating condition, the case where branch in circuit, is：The series circuit of R1 and R2 is in parallel with RP, and with
R5 is in parallel；The case where another branch is the series circuit of R3 and R4, in parallel with Rn.Meanwhile the two branches constitute series connection
Relationship.
At this point, if the numerical value that the voltage Vp and Vn that detect at insulation voltage detection are read respectively is Vp1 and Vn1.Thus
Available following expression formula：
Disconnect T1, closure T2：
Under this operating condition：The case where branch in circuit is：The R1 and R2 of series connection, it is in parallel with Rp.Separately
The case where one branch, is in parallel with R6 for the series circuit of R3 and R4, and in parallel with Rn.Meanwhile the two branches constitute series connection and close
System.
At this point, if the numerical value that the voltage Vp and Vn that detect at insulation voltage detection are read respectively is Vp2 and Vn2.Thus
Available following expression formula：
Wherein, R1+R2=A, R3+R4=C are enabled, (R1+R2) //R5=B, (R3+R4) //R6=D then formula (1) and formula
(2) formula (3) and formula (4) are converted into：
Wherein, in practical applications, it is obtained according to multiple test result, applies the warp of the resistance in the insulation detecting circuit
Testing value is respectively：R2=R3=50K Ω；R1=R4=5M Ω；R1=R4=1.2M Ω；Bring corresponding empirical value into R1+R2=
In (R1+R2) //R5=B, (R3+R4) //R6=D, A, B, C and D is can be obtained in A, R3+R4=C.
In conjunction with known A, B, C and D, and measure the value of obtained Vp1, Vp2, Vn1, Vn2；By formula (3) and (4) group
At band there are two unknown number (Rp and two equations of Rn) can solution obtain two values of corresponding Rp and Rn；As battery pack is being just
Cathode is respectively for the insulation resistance between vehicle ground.
It should be noted that after the insulation resistance Rp and Rn obtained according to formula (3) and formula (4), according toIt can obtain the value of Rn//Rp, useCharacterization of the obtained data as insulating resistance value, that is, report
To the insulating resistance value of vehicle.
Also, since it is considered that the precision problem in the circuit course of work, the table got is reported to entire car controller
It when levying the data of insulating resistance value, needs the data carrying out conservative estimation, chooses suitable data (general less than normal)
It is reported, to ensure the safety of vehicle.
Circuit provided by the utility model belongs to the insulating resistor detecting circuit based on balance bridge scheme, can calculate
One insulation resistance and the second insulation resistance, that is, battery pack positive and negative anodes are respectively for the insulation resistance between vehicle ground.Entirely
Circuit network test mode is simple, and testing efficiency is high and data are accurate, can be very good to meet wanting for vehicle power-on self-test stage
It asks.
In the utility model embodiment unless specifically defined or limited otherwise, term " installation ", " connects " electrical connection "
Connect ", the terms such as " fixation " shall be understood in a broad sense, for example, can make to be fixedly connected, may be a detachable connection, or integral；
It can be mechanical connection, be also possible to be electrically connected；It can make directly to be electrically connected, can also be electrically connected indirectly by intermediary,
It can be the connection inside two elements or the interaction relationship of two elements.For those of ordinary skill in the art and
Speech, can understand the concrete meaning of above-mentioned term in the present invention as the case may be.
The above is preferred embodiments of the present invention, it is noted that for the ordinary skill of the art
For personnel, without departing from the principle of this utility model, several improvements and modifications can also be made, these are improved and profit
Decorations are also considered as the protection scope of the utility model.
Claims (8)
1. a kind of insulating resistor detecting circuit, including power module, which is characterized in that including Insulation monitoring unit, partial pressure unit
And matching unit；The power module, Insulation monitoring unit, partial pressure unit and matching unit are connected in parallel with each other；
The Insulation monitoring unit includes the first insulation resistance (5) and the second insulation resistance (6) being connected in series, and the partial pressure is single
Member includes the first divider resistance (1) being sequentially connected in series, the second divider resistance (2), third divider resistance (3) and the 4th partial pressure
Resistance (4)；The other end of the other end of first insulation resistance (5) and the first divider resistance (1) with power module just
Extremely be connected, the other end of the other end of second insulation resistance (6) and the 4th divider resistance (4) with the cathode of power module
It is connected；
The matching unit includes the first cooperation route being connected in series and the second cooperation route, and the first cooperation route includes
The first build-out resistor (7) and first switch (8) being connected in series, the second cooperation route include the second matching being connected in series
Resistance (9) and second switch (10)；The first cooperation route, with first divider resistance (1) and the second divider resistance (2)
Series circuit be in parallel；The second cooperation route, the string with the third divider resistance (3) and the 4th divider resistance (4)
On line road is in parallel.
2. circuit according to claim 1, which is characterized in that first insulation resistance (5) and the second insulation resistance (6)
Series circuit be connected with ground path；The series circuit and ground path of second divider resistance (2) and third divider resistance (3)
It is connected, also, the series circuit between the first cooperation route and the second cooperation route is connected with ground path.
3. circuit according to claim 1, which is characterized in that first divider resistance (1) and the second divider resistance (2)
Series circuit on be circumscribed with the first insulation voltage detector.
4. circuit according to claim 1, which is characterized in that the third divider resistance (3) and the 4th divider resistance (4)
Series circuit on be circumscribed with the second insulation voltage detector.
5. circuit according to claim 1, which is characterized in that the first switch (8) includes the first relay, and described the
Two switches (10) include the second relay.
6. circuit according to claim 1, which is characterized in that the power module includes the battery mould of multiple series connections
Group.
7. circuit according to claim 6, which is characterized in that the battery modules include the battery list of multiple series connections
Body.
8. circuit according to claim 6, which is characterized in that be arranged between the battery modules and the battery modules
There is service switch.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820352569.8U CN208109933U (en) | 2018-03-15 | 2018-03-15 | A kind of insulating resistor detecting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820352569.8U CN208109933U (en) | 2018-03-15 | 2018-03-15 | A kind of insulating resistor detecting circuit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470923A (en) * | 2018-11-19 | 2019-03-15 | 中国船舶重工集团公司第七O三研究所无锡分部 | A method of it calculates and eliminates high-voltage insulating resistance measurement sample circuit error |
| CN109521277A (en) * | 2018-12-03 | 2019-03-26 | 欣旺达电子股份有限公司 | Insulating properties detection circuit and detection method |
| CN109720235A (en) * | 2018-12-29 | 2019-05-07 | 蜂巢能源科技有限公司 | Insulation Inspection System and electric car based on full-bridge insulation detecting circuit |
| CN109799443A (en) * | 2019-01-31 | 2019-05-24 | 中国北方车辆研究所 | A kind of adaptive insulation detecting method of distribution capacity based on electric vehicle |
| CN111929501A (en) * | 2019-05-13 | 2020-11-13 | 上海海拉电子有限公司 | Insulation resistance value change detection circuit, insulation detection system and method |
| CN111929502A (en) * | 2019-05-13 | 2020-11-13 | 上海海拉电子有限公司 | Insulation detection circuit and method |
| CN112240955A (en) * | 2019-07-17 | 2021-01-19 | 上海海拉电子有限公司 | Insulation detection circuit and method |
| CN112526424A (en) * | 2019-09-18 | 2021-03-19 | 宁德时代新能源科技股份有限公司 | Detection method of insulation detection circuit and battery management system |
| US11733279B2 (en) | 2020-07-27 | 2023-08-22 | Contemporary Amperex Technology Co., Limited | Circuit and method for detecting insulation resistance |
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2018
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109470923A (en) * | 2018-11-19 | 2019-03-15 | 中国船舶重工集团公司第七O三研究所无锡分部 | A method of it calculates and eliminates high-voltage insulating resistance measurement sample circuit error |
| CN109521277A (en) * | 2018-12-03 | 2019-03-26 | 欣旺达电子股份有限公司 | Insulating properties detection circuit and detection method |
| CN109720235A (en) * | 2018-12-29 | 2019-05-07 | 蜂巢能源科技有限公司 | Insulation Inspection System and electric car based on full-bridge insulation detecting circuit |
| CN109720235B (en) * | 2018-12-29 | 2020-06-30 | 蜂巢能源科技有限公司 | Insulation detection system based on full-bridge insulation detection circuit and electric automobile |
| WO2020135703A1 (en) * | 2018-12-29 | 2020-07-02 | 蜂巢能源科技有限公司 | Insulation detection system based on full-bridge insulation detection circuit and electric automobile |
| CN109799443B (en) * | 2019-01-31 | 2021-04-06 | 中国北方车辆研究所 | Distributed capacitance self-adaptive insulation detection method based on electric vehicle |
| CN109799443A (en) * | 2019-01-31 | 2019-05-24 | 中国北方车辆研究所 | A kind of adaptive insulation detecting method of distribution capacity based on electric vehicle |
| CN111929501A (en) * | 2019-05-13 | 2020-11-13 | 上海海拉电子有限公司 | Insulation resistance value change detection circuit, insulation detection system and method |
| CN111929502A (en) * | 2019-05-13 | 2020-11-13 | 上海海拉电子有限公司 | Insulation detection circuit and method |
| CN111929501B (en) * | 2019-05-13 | 2023-04-25 | 上海海拉电子有限公司 | Insulation resistance change detection circuit, insulation detection system and method |
| CN112240955A (en) * | 2019-07-17 | 2021-01-19 | 上海海拉电子有限公司 | Insulation detection circuit and method |
| CN112526424A (en) * | 2019-09-18 | 2021-03-19 | 宁德时代新能源科技股份有限公司 | Detection method of insulation detection circuit and battery management system |
| CN112526424B (en) * | 2019-09-18 | 2021-09-28 | 宁德时代新能源科技股份有限公司 | Detection method of insulation detection circuit and battery management system |
| US11852670B2 (en) | 2019-09-18 | 2023-12-26 | Contemporary Amperex Technology Co., Limited | Method for monitoring insulation monitoring circuit and battery management system |
| US11733279B2 (en) | 2020-07-27 | 2023-08-22 | Contemporary Amperex Technology Co., Limited | Circuit and method for detecting insulation resistance |
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