CN203705549U - Insulation resistor detection system of power system - Google Patents
Insulation resistor detection system of power system Download PDFInfo
- Publication number
- CN203705549U CN203705549U CN201320782871.4U CN201320782871U CN203705549U CN 203705549 U CN203705549 U CN 203705549U CN 201320782871 U CN201320782871 U CN 201320782871U CN 203705549 U CN203705549 U CN 203705549U
- Authority
- CN
- China
- Prior art keywords
- resistance
- voltage
- semiconductor
- oxide
- metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 48
- 238000001514 detection method Methods 0.000 title claims abstract description 43
- 239000004065 semiconductor Substances 0.000 claims description 51
- 230000005693 optoelectronics Effects 0.000 claims description 44
- 238000006243 chemical reaction Methods 0.000 claims description 27
- 238000002955 isolation Methods 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 102100039435 C-X-C motif chemokine 17 Human genes 0.000 description 2
- 101000889048 Homo sapiens C-X-C motif chemokine 17 Proteins 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001973 epigenetic effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The utility model provides an insulation resistor detection system of a power system. The power system comprises a power battery. The insulation resistor detection system of the power system comprises a selection circuit for switch on a positive electrode of a power battery or a negative electrode of the power battery, a first voltage dividing circuit one end of which is connected with the selection circuit, a control switch, a second voltage dividing circuit one end of which is connected with the selection circuit and the other end of which is grounded through the control switch, and a controller which is connected with the selection circuit and the other end of the first voltage dividing circuit respectively. When the positive electrode of the power battery is switched on and the control switch is in a disconnected state, the other end of the first voltage dividing circuit outputs a first voltage; when the positive electrode of the power battery is switched on and the control switch is in a connected state, the other end of the first voltage dividing circuit outputs a second voltage; when the negative electrode of the power battery is switched on and the control switch is in a disconnected state, the other end of the first voltage dividing circuit outputs a third voltage; and, when the negative electrode of the power battery is switched on and the control switch is in a connected state, the other end of the first voltage dividing circuit outputs a fourth voltage. The controller controls the selection circuit, and insulation resistances of the power system are obtained according to the first voltage, the second voltage, the third voltage and the fourth voltage. High-voltage output safety of a vehicle can be improved, and the insulation resistor detection system of the power system has the advantage of low cost at the same time.
Description
Technical field
The utility model relates to field of automobile, particularly a kind of insulation resistance detection system of power system.
Background technology
As the main research and development direction of Future New Energy Source automobile, there is at present many technical matterss in lithium-ion-power cell, such as flying power problem, safety problem are all the main difficult technical facing at present.Due to automobile electromagnetic circumstance complication, noise is larger, and collection, transmission and the processing to data all may cause fatal mistake, therefore, how to stop the on fire and high-voltage electric shock driver and conductor of high voltage short circuit and seems particularly important.
In electric automobile taking electrokinetic cell as energy source and hybrid vehicle, battery voltage is all up to several hectovolts, isolation detection module realize in electric automobile (EV)/hybrid vehicle (HEV) electric battery High voltage output whether with vehicle body good insulation, be one of important leverage of battery management system (BMS) security and reliability.
Common isolation detection system is that after utilizing first dividing potential drop, isolation is amplified into processor through calculus of differences more in the market, then the voltage collecting is carried out the computing of isolation resistance in processor, be then transferred to entire car controller report by CAN.The theory diagram of this system as shown in Figure 1.In addition, the general conduct of insulation resistance detection independently module detects, but needs so independently to install, and increased fixing difficulty is installed, and independently CPU performs mathematical calculations, and has increased design cost, and the precision detecting is not high, poor stability.
Utility model content
The utility model is intended at least one of solve the problems of the technologies described above.
For this reason, the purpose of this utility model is to provide a kind of insulation resistance detection system of power system, and this system can improve the High voltage output security of vehicle, and has advantages of that cost is low simultaneously.
To achieve these goals, the utility model provides a kind of insulation resistance detection system of power system, described power system comprises: electrokinetic cell, and the insulation resistance detection system of described electrokinetic cell comprises: for connecting the selection circuit of described power battery anode or described power battery cathode; The first bleeder circuit, one end of described the first bleeder circuit is connected with described selection circuit; Gauge tap; The second bleeder circuit, one end of described the second bleeder circuit be connected with described selection circuit and the other end by described gauge tap ground connection, described power battery anode is connected and when described gauge tap opening and closing two states and described power battery cathode is connected and when described gauge tap opening and closing two states, the other end of described the first bleeder circuit is exported respectively the first voltage to the four voltages; The controller being connected with the other end of described the first bleeder circuit with described selection circuit respectively, described controller is controlled described selection circuit, and obtains the insulation resistance of described power system according to described the first voltage to the four voltages.
According to the insulation resistance detection system of power system of the present utility model, in the time of automobilism, controller control high pressure selects circuit to connect the negative or positive electrode of electrokinetic cell, the negative or positive electrode of electrokinetic cell is just being exported, negative pole high-voltage signal carries out dividing potential drop by the first bleeder circuit, to obtain the first voltage and second voltage, in the time that gauge tap is closed, the second bleeder circuit is connected and is in parallel with the first bleeder circuit, now can obtain tertiary voltage and the 4th voltage, controller calculates the insulation resistance of power system by correlation formula according to first to fourth voltage.To sum up, detection system of the present utility model selects circuit to carry out the collection of front end high signal by high pressure, effectively isolation detection is carried out in electrokinetic cell inside, what reduced that communication between plate produces crosstalks, and has improved the High voltage output security of vehicle, ensure occupant's safety, in addition, the device that native system uses is few, and simple in structure, therefore, cost is lower.Meanwhile, this system integration, in battery management system inside, therefore, has higher measuring accuracy and reliability.
In addition, can also there is following additional technical characterictic according to the insulation resistance detection system of the above-mentioned power system of the utility model:
Further, also comprise: modulus conversion chip, described modulus conversion chip is arranged between described the first bleeder circuit and described controller, and described gauge tap is by described modulus conversion chip control.
Further, also comprise: isolating chip, described isolating chip is arranged between described modulus conversion chip and described controller
Further, described gauge tap is optoelectronic switch.
Further, described the first bleeder circuit comprises: the first resistance to the three resistance of series connection, and one end of described the first resistance is connected with described selection resistance, and the other end of described the 3rd resistance is connected with described controller; The 4th resistance, one end of described the 4th resistance is connected with the other end of described the 3rd resistance and the other end ground connection of described the 4th resistance; Electric capacity, described electric capacity is in parallel with described the 4th resistance.
Further, described the second bleeder circuit comprises: the 5th resistance to the seven resistance of series connection, and one end of described the 5th resistance is connected with described selection circuit, and the other end of described the 7th resistance is by described optoelectronic switch ground connection.
Further, described selection circuit comprises: the first optoelectronic switch and the second optoelectronic switch, the first terminals of described the first optoelectronic switch are connected with the positive pole of described electrokinetic cell, the second terminals of described the first optoelectronic switch are connected with described the first bleeder circuit, the first terminals of described the second optoelectronic switch are connected with the negative pole of described electrokinetic cell, and the second terminals of described the second optoelectronic switch are connected with described the first bleeder circuit.
Further, described selection circuit also comprises: the 8th resistance, and one end of described the 8th resistance is connected with described controller; The first metal-oxide-semiconductor, the grid of described the first metal-oxide-semiconductor is connected with the other end of described the 8th resistance, and the drain electrode of described the first metal-oxide-semiconductor is connected with the first control end of described the second optoelectronic switch by the 9th resistance, and the source electrode of described the first metal-oxide-semiconductor is connected with power supply; The second metal-oxide-semiconductor, the grid of described the second metal-oxide-semiconductor is connected with the grid of described the first metal-oxide-semiconductor, and the drain electrode of described the second metal-oxide-semiconductor is connected and source ground with the second control end of described the first optoelectronic switch; The 3rd metal-oxide-semiconductor, the grid of described the 3rd metal-oxide-semiconductor is connected with described controller by the tenth resistance, and the source electrode of described the 3rd metal-oxide-semiconductor is connected with described power supply and drain electrode is connected with the first control end of described the first optoelectronic switch; The 4th metal-oxide-semiconductor, the grid of described the 4th metal-oxide-semiconductor is connected with the grid of described the 3rd metal-oxide-semiconductor, and the source ground of described the 4th metal-oxide-semiconductor and drain electrode are connected with the second control end of described the second photoelectricity switch.
Additional aspect of the present utility model and advantage in the following description part provide, and part will become obviously from the following description, or recognize by practice of the present utility model.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present utility model and advantage accompanying drawing below combination is understood becoming the description of embodiment obviously and easily, wherein:
Fig. 1 is the theory diagram of existing a kind of insulation resistance detection system;
Fig. 2 is according to the structured flowchart of the insulation resistance detection system of the power system of an embodiment of the utility model;
Fig. 3 is according to the circuit theory schematic diagram of the insulation resistance detection system of the power system of an embodiment of the utility model; And
Fig. 4 is the internal electrical PCB schematic layout pattern according to the insulation resistance detection system of the power system of an embodiment of the utility model.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has the element of identical or similar functions from start to finish.Be exemplary below by the embodiment being described with reference to the drawings, only for explaining the utility model, and can not be interpreted as restriction of the present utility model.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinally ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of instructions such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of device or the element of instruction or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand the concrete meaning of above-mentioned term in the utility model.
Describe according to the insulation resistance detection system of the power system of the utility model above-described embodiment below in conjunction with accompanying drawing.
Fig. 2 is according to the structured flowchart of the insulation resistance detection system of the power system of an embodiment of the utility model.As shown in Figure 2, according to the insulation resistance detection system 100 of the power system of an embodiment of the utility model, select circuit 110, the first bleeder circuit 120, gauge tap 130, the second bleeder circuit 140 and controller 150.Wherein, above-mentioned power system comprises electrokinetic cell.
Particularly, select circuit 110 for connecting power battery anode or power battery cathode.As a concrete example, selecting circuit 110 is for example the high-voltage interlocking circuit of vehicle, and it is for by the high-voltage positive electrode of electrokinetic cell or high voltage negative detection circuit for access.
One end of the first bleeder circuit 120 is connected with selecting circuit 110.As a concrete example, the first bleeder circuit 120 for example can be composed in series by multiple resistance.
In an embodiment of the present utility model, gauge tap 130 is for example but is not limited to optoelectronic switch.
One end of the second bleeder circuit 140 is connected with selection circuit 110 and the other end passes through gauge tap 130 ground connection, power battery anode is connected and when gauge tap 130 opening and closing two states and power battery cathode is connected and when gauge tap 130 opening and closing two states, the other end of the first bleeder circuit 120 is exported respectively the first voltage to the four voltages.In other words,, in the time selecting circuit 110 to connect high-voltage positive electrode and gauge tap 130 to disconnect, now only have the first bleeder circuit 120 to align extra-high voltage signal and carry out dividing potential drop, now the other end of the first bleeder circuit 120 is exported the first voltage.In the time selecting circuit 110 to connect high-voltage positive electrode and gauge tap 130 closure, now the first bleeder circuit 120 and the second bleeder circuit 140 simultaneously in detection circuit for access to align extra-high voltage signal dividing potential drop, and the two is parallel with one another, the now other end of the first bleeder circuit 120 output second voltage.In the time selecting circuit 110 to connect high voltage negative and switch 130 to disconnect, now only has in the first bleeder circuit 120 detection circuit for access with anticathode high-voltage signal dividing potential drop the now other end of the first bleeder circuit 120 output tertiary voltage.In the time selecting circuit 110 to connect high voltage negative and gauge tap 130 closure, now the first bleeder circuit 120 and the second bleeder circuit 140 simultaneously in detection circuit for access with anticathode high-voltage signal dividing potential drop, and the two is parallel with one another, the now other end of the first bleeder circuit 120 output the 4th voltage.
Controller 150 is connected with the other end of the first bleeder circuit 120 with selecting circuit 110 respectively, and controller 150 is controlled selection circuit 110, and obtains the insulation resistance of power system according to the first voltage to the four voltages.
In above-mentioned example, the principle of work of this detection system 100 is: controller 150 is controlled and selected circuit 110 to connect power battery anode or negative pole.In the time connecting power battery anode, now output cathode high-voltage signal, in the time that gauge tap 130 disconnects, now only has the first bleeder circuit 120 to carry out dividing potential drop to the anodal high-voltage signal of power battery anode output, and the voltage after the first bleeder circuit output dividing potential drop, is the first voltage.On the other hand, in the time connecting power battery anode and gauge tap 130 closure, now in the first bleeder circuit 120 and the second bleeder circuit 140 access insulating resistor detecting circuit parallel with one another, and align extra-high voltage signal simultaneously and carry out dividing potential drop, and the first bleeder circuit output is the voltage after common dividing potential drop now, is second voltage.Further, in the time that controller 130 is controlled selection circuit connection power battery cathode, now output negative pole high-voltage signal, in the time that gauge tap 130 disconnects, now only have the first bleeder circuit 120 to carry out dividing potential drop to the negative pole high-voltage signal of power battery cathode output, and the first bleeder circuit 120 is exported the voltage after dividing potential drop, is tertiary voltage.On the other hand, in the time connecting power battery cathode and gauge tap 130 closure, now in the first bleeder circuit 120 and the second bleeder circuit 140 access insulating resistor detecting circuit parallel with one another, and anticathode high-voltage signal carries out dividing potential drop simultaneously, and the first bleeder circuit output is the voltage after common dividing potential drop now, is the 4th voltage.Finally, controller 150, according to the first voltage to the four voltages obtained above, obtains the insulation resistance of power system by mathematical computations.
As a concrete example, controller 150 for example can calculate insulation resistance by following formula:
Work as V
1>V
1' time, insulation resistance R
ifor:
Work as V
1<V
1' time, insulation resistance R
ifor:
Wherein, V
1be the first voltage, V
1' be second voltage, V
2for tertiary voltage, V
2' be the 4th voltage, R
0for the measuring resistance calculating according to the nominal voltage of electrokinetic cell, and R
0between the Ω/V of 100 Ω/V～500.
Further, shown in Fig. 2, the detection system 100 of the utility model above-described embodiment also comprises: modulus conversion chip 160 and isolating chip 170.
Modulus conversion chip 160 is arranged between the first bleeder circuit 120 and controller 150, and gauge tap 130 is controlled by modulus conversion chip 160.Particularly, modulus conversion chip 160 is for sending the closed of high level or low level signal control gauge tap 130 or disconnecting, thereby further determines whether the second bleeder circuit 140 accesses.In addition, pattern conversion chip 160 also carries out analog to digital conversion for the analog voltage signal that circuit is produced, and the digital signal after conversion is sent to isolating chip 170.
Isolating chip 170 is arranged between modulus conversion chip 160 and controller 150, after receiving digital signal that modulus conversion chip 160 sends and this digital signal is isolated etc. to processing, be sent to controller 150, to reduce crosstalking of producing in signals transmission etc.
To sum up, this detection system 100 is in the time detecting insulation resistance, first controller 150 is controlled the negative or positive electrode output of selecting circuit 110 to select electrokinetic cell, now, gauge tap 130 disconnects, the positive and negative electrode high-voltage signal of output carries out dividing potential drop by the first bleeder circuit 110, after dividing potential drop, becomes two millivolt level analog voltage signals (being respectively the signal that high-voltage positive electrode and negative pole produce after the first bleeder circuit, is also the first voltage and tertiary voltage); Further, modulus conversion chip 160 sends the break-make of high and low level signal control optoelectronic switch (gauge tap 130) to introduce the second bleeder circuit 140, make it in parallel with the first bleeder circuit 120, the high-voltage signal of output is carried out to dividing potential drop simultaneously, and again produce two groups of millivolt level analog voltage signals (two groups of voltage signals that to be respectively high-voltage positive electrode and negative pole produce after the first bleeder circuit and the second bleeder circuit dividing potential drop in parallel are also second voltage and the 4th voltage).Produce since then four groups of millivolt level analog voltage signals, and send these four analog voltage signal timesharing to modulus conversion chip 160 and carry out analog to digital conversion, digital signal after conversion is sent to controller 150 and performs mathematical calculations after digital isolating chip 170 isolation, finally calculate the insulation resistance size between electrokinetic cell and vehicle body, detect thus isolation effect.
Further, shown in Fig. 3, in an embodiment of the present utility model, the first above-mentioned bleeder circuit 120 comprises: the first resistance 121, the second resistance 122, the 3rd resistance 123, the 4th resistance 124 and electric capacity 125.
Wherein, the first resistance 121 to the 3rd resistance 123 is connected mutually, and one end of the first resistance 121 with select circuit 110 be connected, the other end of the 3rd resistance 123 is connected with controller 150.
One end of the 4th resistance 124 is connected with the other end of the 3rd resistance 123 and the other end ground connection of the 4th resistance 124.
Electric capacity 125 is in parallel with the 4th resistance 124.
Shown in Fig. 3, the second above-mentioned bleeder circuit 140 comprises: the 5th resistance 141, the 6th resistance 142 and the 7th resistance 143.Wherein, the 5th resistance 141 to the 7th resistance 143 is connected mutually, and one end of the 5th resistance 141 with select circuit 110 be connected, the other end of the 7th resistance 143 is by optoelectronic switch (being gauge tap 130) ground connection.
As shown in Figure 3, in an embodiment of the present utility model, select circuit 110 to comprise: the first optoelectronic switch 111 and the second broadcasting and TV switch 112.
Wherein, the first terminals of the first optoelectronic switch 111 are connected with the positive pole of electrokinetic cell, and the second terminals of the first optoelectronic switch 111 are connected with the first bleeder circuit 120.The first terminals of the second optoelectronic switch 112 are connected with the negative pole of electrokinetic cell, and the second terminals of the second optoelectronic switch 112 are connected with the first bleeder circuit 120.
Further, shown in Fig. 3, select circuit 110 also to comprise: the 8th resistance 113, the first metal-oxide-semiconductor 114, the second metal-oxide-semiconductor 115, the 3rd metal-oxide-semiconductor 116 and the 4th metal-oxide-semiconductor 117.
Wherein, one end of the 8th resistance 113 is connected with controller 150.
The grid of the first metal-oxide-semiconductor 114 is connected with the other end of the 8th resistance 113, and the drain electrode of the first metal-oxide-semiconductor 114 is connected with the first control end of the second optoelectronic switch 112 by the 9th resistance, and the source electrode of the first metal-oxide-semiconductor 114 is connected with power supply VCC1.
The grid of the second metal-oxide-semiconductor 115 is connected with the grid of the first metal-oxide-semiconductor 114, and the drain electrode of the second metal-oxide-semiconductor 115 is connected with the second control end of the first optoelectronic switch 111 and the source ground of the second metal-oxide-semiconductor 115.
The grid of the 3rd metal-oxide-semiconductor 116 is connected with controller 150 by the tenth resistance, and the source electrode of the 3rd metal-oxide-semiconductor 116 is connected with power supply VCC1 and drains and is connected with the first control end of the first optoelectronic switch pipe 111.
The grid of the 4th metal-oxide-semiconductor 117 is connected with the grid of the 3rd metal-oxide-semiconductor 116, and the source ground of the 4th metal-oxide-semiconductor and drain electrode are connected with the second control end of the second optoelectronic switch 112.
Particularly, in the circuit shown in Fig. 3, the roughly principle of work of this circuit is: first utilize high pressure to select the advantage of circuit 110 that the high pressure of electrokinetic cell is introduced, select to gather high-voltage positive electrode signal or high voltage negative signal by the switching of the first optoelectronic switch 111 and the second optoelectronic switch 112, then obtain two voltage signals through the first bleeder circuit 120 dividing potential drops, the tertiary voltage after positive extra-high voltage dividing potential drop when gauge tap 130 disconnects after the first voltage and negative pole high pressure dividing potential drop.Pass through again Closed control switch 130 by the first bleeder circuit 120 and the second bleeder circuit parallel connection, specifically comprise: by Closed control switch 130, two epigenetic resistance are introduced to carry out parallel connection with former divider resistance, thereby can obtain two groups of voltages, be also second voltage and the 4th voltage.Finally, four groups of magnitudes of voltage obtained above are sent to modulus conversion chip 160, it is for example single-chip microcomputer that digital signal after changing transfers to controller 150(after isolating chip 170 isolation again), finally calculate the size of insulation resistance by controller 150 processes, and judge accordingly insulation effect.
More specifically, as shown in Figure 3, first be one end of controller 150 by single-chip microcomputer GPIO1() high level signal of transmission, GPIO2(is the other end of controller 150) low level signal of transmission, now the second metal-oxide-semiconductor 115 conductings, the second control end (2) of selecting the first optoelectronic switch 111 of circuit 110 is low level, the 3rd metal-oxide-semiconductor 116 conductings, first control end (1) of the first optoelectronic switch 111 is high level, the all conductings of first terminals (7) of the first electric switch and the second terminals (8), high-voltage positive electrode signal can carry out dividing potential drop through the first resistance 121 to the 3rd resistance 123, and obtain the magnitude of voltage V after dividing potential drop
1when gauge tap 130 receives after the high level signal conducting that AD conversion chip (being modulus conversion chip 160) sends, introduce the 5th resistance 141 to the 7th resistance 143 and the first resistance 121 to the 3rd resistance 123 and carry out the rear dividing potential drop simultaneously of parallel connection, and obtain the magnitude of voltage V after dividing potential drop
1'.In like manner, when GPIO2 sends a high level signal, when GPIO1 sends a low level signal, now the 4th metal-oxide-semiconductor 117 conductings, second control end (4) of the second optoelectronic switch 112 is low level, the first metal-oxide-semiconductor 114 conductings, first control end (3) of the second optoelectronic switch 112 is high level, first terminals (6) of the second optoelectronic switch 112 and the second terminals (5) conducting, high voltage negative signal can carry out dividing potential drop through the first resistance 121 to the 3rd resistance 123, and obtains the magnitude of voltage V after dividing potential drop
2when gauge tap 130 receives after the high level signal conducting that AD conversion chip (being modulus conversion chip 160) sends, introduce the 5th resistance 141 to the 7th resistance 142 and the first resistance 121 to the 3rd resistance 123 and carry out the rear dividing potential drop simultaneously of parallel connection, and obtain the magnitude of voltage V after dividing potential drop
2'.
In said process, obtain high-voltage positive electrode through the first resistance 121 to the magnitude of voltage V after the 3rd resistance 123 dividing potential drops
1, and high-voltage positive electrode through the first resistance 121 to the 3rd resistance 123 and the 5th resistance 141 to the 7th resistance 143 parallel connections after the magnitude of voltage V of dividing potential drop
1', also obtain high voltage negative through the first resistance 121 to the magnitude of voltage V after the 3rd resistance 123 dividing potential drops
2, and high voltage negative through the first resistance 121 to the 3rd resistance 123 and the 5th resistance 141 to the 7th resistance 143 parallel connections after the magnitude of voltage V of dividing potential drop
2'.Controller 150 can calculate insulating resistance value by following formula (1) or formula (2).
If V
1>V
1', insulation resistance R
ifor:
If V
1<V
1', insulation resistance R
ifor:
Wherein, above-mentioned V
1be the first voltage, V
1' be second voltage, V
2be tertiary voltage, V
2' be the 4th voltage, R
0for the measuring resistance calculating according to the nominal voltage of electrokinetic cell, and R
0between the Ω/V of 100 Ω/V～500.
Thereby; in sum; said detecting system 100 is in the time detecting insulation resistance; utilize high pressure to select circuit protection and in gatherer process, occur the problem of the positive and negative level of high pressure short circuit; reduce again the quantity that AD conversion chip uses simultaneously; save the IO interface resource of controller (CPU), reduced the expense of CPU mathematical operation resource.In addition; it is to utilize the switching characteristic of metal-oxide-semiconductor to coordinate optoelectronic switch to form special logical relation that high pressure is selected circuit; and high pressure selects the logical relation of circuit as shown in table 1 below; finally make the optoelectronic switch can only the conducting of You Yi road at synchronization; thereby avoid the high voltage short circuit problem in gatherer process; effectively protect the safety of power, avoided the on fire or potential safety hazard causing to driver and conductor of smoldering causing because of high voltage short circuit.
| High pressure+ | High pressure ﹣ | Select the output of circuit high-voltage signal |
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
Table 1
In addition, Fig. 4 is the internal electrical PCB schematic layout pattern according to the insulation resistance detection system of the power system of an embodiment of the utility model.
Particularly, the implementing circuit of this test macro 100, in the time of PCB layout, should note needing between high pressure and low pressure the mode of cutting copper sheet to increase creepage distance, avoids the work of the sword cutting edge of a knife or a sword effect of signals low-voltage circuit that high pressure produces.Wherein, each components and parts layout is sequentially as the order of Fig. 4 institute layout is carried out, can make like this high-voltage signal along straight line transmission, avoid because hi-line is long or bending causes high pressure spike to produce, other signals on plate are caused to interference, ensure to simulate after dividing potential drop the not weakened or decay of low-voltage signal simultaneously, improve signals collecting precision.
According to the insulation resistance detection system of the power system of the utility model embodiment, in the time of automobilism, controller control high pressure selects circuit to connect the negative or positive electrode of electrokinetic cell, the negative or positive electrode of electrokinetic cell is just being exported, negative pole high-voltage signal carries out dividing potential drop by the first bleeder circuit, to obtain the first voltage and second voltage, in the time that gauge tap is closed, the second bleeder circuit is connected and is in parallel with the first bleeder circuit, now can obtain tertiary voltage and the 4th voltage, controller calculates the insulation resistance of power system by correlation formula according to first to fourth voltage.To sum up, detection system of the present utility model selects circuit to carry out the collection of front end high signal by high pressure, effectively isolation detection is carried out in electrokinetic cell inside, what reduced that communication between plate produces crosstalks, and has improved the High voltage output security of vehicle, ensure occupant's safety, in addition, the device that native system uses is few, and simple in structure, therefore, cost is lower.Meanwhile, this system integration is in battery management system inside, and carries out the setting of components and parts according to certain layout order, can ensure the not weakened or decay of simulating signal after dividing potential drop, and therefore, this system also has higher measuring accuracy and reliability.
In the description of this instructions, the description of reference term " embodiment ", " some embodiment ", " example ", " concrete example " or " some examples " etc. means to be contained at least one embodiment of the present utility model or example in conjunction with specific features, structure, material or the feature of this embodiment or example description.In this manual, the schematic statement of above-mentioned term is not necessarily referred to identical embodiment or example.And specific features, structure, material or the feature of description can be with suitable mode combination in any one or more embodiment or example.
Although illustrated and described embodiment of the present utility model, those having ordinary skill in the art will appreciate that: in the situation that not departing from principle of the present utility model and aim, can carry out multiple variation, amendment, replacement and modification to these embodiment, scope of the present utility model is by claim and be equal to and limit.
Claims (8)
1. an insulation resistance detection system for power system, is characterized in that, described power system comprises electrokinetic cell, and the insulation resistance detection system of described power system comprises:
For connecting the selection circuit of described power battery anode or described power battery cathode;
The first bleeder circuit, one end of described the first bleeder circuit is connected with described selection circuit;
Gauge tap;
The second bleeder circuit, one end of described the second bleeder circuit be connected with described selection circuit and the other end by described gauge tap ground connection, described power battery anode is connected and when described gauge tap opening and closing two states and described power battery cathode is connected and when described gauge tap opening and closing two states, the other end of described the first bleeder circuit is exported respectively the first voltage to the four voltages;
The controller being connected with the other end of described the first bleeder circuit with described selection circuit respectively, described controller is controlled described selection circuit, and obtains the insulation resistance of described power system according to described the first voltage to the four voltages.
2. the insulation resistance detection system of power system according to claim 1, is characterized in that, also comprises:
Modulus conversion chip, described modulus conversion chip is arranged between described the first bleeder circuit and described controller, and described gauge tap is by described modulus conversion chip control.
3. the insulation resistance detection system of power system according to claim 2, is characterized in that, also comprises:
Isolating chip, described isolating chip is arranged between described modulus conversion chip and described controller.
4. the insulation resistance detection system of power system according to claim 1, is characterized in that, described gauge tap is optoelectronic switch.
5. the insulation resistance detection system of power system according to claim 1, is characterized in that, described the first bleeder circuit comprises:
The first resistance to the three resistance of series connection, one end of described the first resistance is connected with described selection circuit, and the other end of described the 3rd resistance is connected with described controller;
The 4th resistance, one end of described the 4th resistance is connected with the other end of described the 3rd resistance and the other end ground connection of described the 4th resistance;
Electric capacity, described electric capacity is in parallel with described the 4th resistance.
6. the insulation resistance detection system of power system according to claim 4, it is characterized in that, described the second bleeder circuit comprises: the 5th resistance to the seven resistance of series connection, one end of described the 5th resistance is connected with described selection circuit, and the other end of described the 7th resistance is by described optoelectronic switch ground connection.
7. the insulation resistance detection system of power system according to claim 1, is characterized in that, described selection circuit comprises:
The first optoelectronic switch and the second optoelectronic switch, the first terminals of described the first optoelectronic switch are connected with the positive pole of described electrokinetic cell, the second terminals of described the first optoelectronic switch are connected with described the first bleeder circuit, the first terminals of described the second optoelectronic switch are connected with the negative pole of described electrokinetic cell, and the second terminals of described the second optoelectronic switch are connected with described the first bleeder circuit.
8. the insulation resistance detection system of power system according to claim 7, is characterized in that, described selection circuit also comprises:
The 8th resistance, one end of described the 8th resistance is connected with described controller;
The first metal-oxide-semiconductor, the grid of described the first metal-oxide-semiconductor is connected with the other end of described the 8th resistance, and the drain electrode of described the first metal-oxide-semiconductor is connected with the first control end of described the second optoelectronic switch by the 9th resistance, and the source electrode of described the first metal-oxide-semiconductor is connected with power supply;
The second metal-oxide-semiconductor, the grid of described the second metal-oxide-semiconductor is connected with the grid of described the first metal-oxide-semiconductor, and the drain electrode of described the second metal-oxide-semiconductor is connected and source ground with the second control end of described the first optoelectronic switch;
The 3rd metal-oxide-semiconductor, the grid of described the 3rd metal-oxide-semiconductor is connected with described controller by the tenth resistance, and the source electrode of described the 3rd metal-oxide-semiconductor is connected with described power supply and drain electrode is connected with the first control end of described the first optoelectronic switch;
The 4th metal-oxide-semiconductor, the grid of described the 4th metal-oxide-semiconductor is connected with the grid of described the 3rd metal-oxide-semiconductor, and the source ground of described the 4th metal-oxide-semiconductor and drain electrode are connected with the second control end of described the second optoelectronic switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320782871.4U CN203705549U (en) | 2013-12-02 | 2013-12-02 | Insulation resistor detection system of power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320782871.4U CN203705549U (en) | 2013-12-02 | 2013-12-02 | Insulation resistor detection system of power system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203705549U true CN203705549U (en) | 2014-07-09 |
Family
ID=51055969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320782871.4U Expired - Lifetime CN203705549U (en) | 2013-12-02 | 2013-12-02 | Insulation resistor detection system of power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203705549U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502712A (en) * | 2014-11-13 | 2015-04-08 | 重庆小康工业集团股份有限公司 | Insulation detection control device and control method for electric automobile power system |
| CN105911352A (en) * | 2016-04-13 | 2016-08-31 | 北京新能源汽车股份有限公司 | Tester for measuring insulation resistance of power battery |
| CN106707116A (en) * | 2016-11-29 | 2017-05-24 | 北京理工华创电动车技术有限公司 | Electric automobile body insulation detection system and method |
| CN112578300A (en) * | 2020-11-30 | 2021-03-30 | 珠海格力电器股份有限公司 | Detection device and method for insulation resistance of power battery and automobile |
| CN117148079A (en) * | 2023-11-01 | 2023-12-01 | 广东智能无人系统研究院(南沙) | Insulation detection circuit and detection method |
-
2013
- 2013-12-02 CN CN201320782871.4U patent/CN203705549U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104502712A (en) * | 2014-11-13 | 2015-04-08 | 重庆小康工业集团股份有限公司 | Insulation detection control device and control method for electric automobile power system |
| CN104502712B (en) * | 2014-11-13 | 2017-10-24 | 重庆小康工业集团股份有限公司 | A kind of power system of electric automobile Insulation monitoring control device and control method |
| CN105911352A (en) * | 2016-04-13 | 2016-08-31 | 北京新能源汽车股份有限公司 | Tester for measuring insulation resistance of power battery |
| CN106707116A (en) * | 2016-11-29 | 2017-05-24 | 北京理工华创电动车技术有限公司 | Electric automobile body insulation detection system and method |
| CN106707116B (en) * | 2016-11-29 | 2023-09-12 | 北京理工华创电动车技术有限公司 | Electric automobile body insulation detection system and detection method |
| CN112578300A (en) * | 2020-11-30 | 2021-03-30 | 珠海格力电器股份有限公司 | Detection device and method for insulation resistance of power battery and automobile |
| WO2022110887A1 (en) * | 2020-11-30 | 2022-06-02 | 珠海格力电器股份有限公司 | Apparatus and method for measuring insulation resistance of power battery, and automobile |
| CN117148079A (en) * | 2023-11-01 | 2023-12-01 | 广东智能无人系统研究院(南沙) | Insulation detection circuit and detection method |
| CN117148079B (en) * | 2023-11-01 | 2024-01-23 | 广东智能无人系统研究院(南沙) | Insulation detection circuit and detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203705549U (en) | Insulation resistor detection system of power system | |
| CN101025436B (en) | High-voltage safety monitoring device for electric automobile | |
| CN204557082U (en) | Pure electric vehicle controller power waken system and power supply wake-up circuit | |
| US9030205B2 (en) | Electric leakage detecting apparatus | |
| US10399451B2 (en) | Method for preparing the supply of power to a vehicle where a voltage level of the power is decided by communication between the supply apparatus and the supply device | |
| CN103454498A (en) | Insulation detection method of electric vehicle power battery pack | |
| CN103278776B (en) | A kind of batteries of electric automobile Insulation Inspection System | |
| CN106114267A (en) | A kind of battery of electric vehicle bag switching control and method | |
| CN102398524B (en) | Power management device for electromobile | |
| CN105122577A (en) | Overcurrent detection device, charging/discharging system using said overcurrent detection device, distribution board, charging control device, vehicle charging/discharging device, and vehicle electrical apparatus | |
| CN105158632A (en) | Power cell insulation and leakage detection system | |
| CN202651832U (en) | Vehicle battery pack | |
| CN202906547U (en) | Vehicle-mounted battery charging device | |
| CN105765687A (en) | System for determining fixation of relay | |
| CN104142475A (en) | Device and method for evaluating insulation detecting module | |
| CN104597332A (en) | Networked three-phase circuit phase sequence detection device and detection method thereof | |
| CN103901325A (en) | Insulation monitoring device of hybrid vehicle | |
| CN205176141U (en) | Electric automobile battery insulation detecting system | |
| CN205051404U (en) | Battery charging system | |
| US9864014B2 (en) | System and method for assessing voltage threshold detecting circuitry within a battery pack | |
| CN203995737U (en) | A kind of electric automobile high-voltage switching arrangement | |
| CN211252278U (en) | Double-lithium battery intelligent management equipment | |
| CN205811601U (en) | Charging control circuit, charging device and mobile terminal | |
| CN106329590A (en) | Active equalization circuit system with high safety and reliability | |
| CN204696641U (en) | A kind of equipment for the protection of high-tension battery using electricity system and the vehicle with this equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140709 |
|
| CX01 | Expiry of patent term |