CN204287290U - A kind of voltage measurement interface circuit of resistance to high back-pressure - Google Patents
A kind of voltage measurement interface circuit of resistance to high back-pressure Download PDFInfo
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- CN204287290U CN204287290U CN201420678626.3U CN201420678626U CN204287290U CN 204287290 U CN204287290 U CN 204287290U CN 201420678626 U CN201420678626 U CN 201420678626U CN 204287290 U CN204287290 U CN 204287290U
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Abstract
The utility model discloses a kind of voltage measurement interface circuit of resistance to high back-pressure, comprise: battery unit, be connected to a RC filtering circuit and the 2nd RC filtering circuit at the positive and negative the two poles of the earth of battery unit, and the voltage stabilizing diode in parallel with a RC filtering circuit and the 2nd RC filtering circuit, be connected the first high withstand voltage diode between battery unit positive pole with a RC filtering circuit, between battery unit negative pole with the 2nd RC filtering circuit, be connected the second high withstand voltage diode.Two high withstand voltage diodes are introduced in this circuit, make to deposit in case in high back-pressure, voltage measurement interface circuit can not form loop, also the possibility of overcurrent is just eliminated, avoid because battery pole ear fracture appears in battery unit and cause BMU to burn the problem even causing cells burst, effectively improve the security of system cloud gray model.
Description
Technical field
The utility model relates to tension measuring circuit field, is specifically related to a kind of voltage measurement interface circuit of resistance to high back-pressure.
Background technology
Electric motor car as the representative of new forms of energy car, because its environmental protection, economy receive increasing concern.Electric motor car generally uses the electric battery of high pressure to provide direct supply to drive vehicle to travel, and such as, under state's net standard cell, the electric battery of a general standard electric passenger vehicle has the battery unit adopting series system to connect 4 more, altogether 320V nominal voltage.This high-tension battery group has higher requirement to its battery management system (BMS).
A basic function of battery management system is exactly the voltage of each single bag battery unit measured in electric battery.Existing conventional voltage measurement interface circuit, comprise: battery unit, the RC filtering circuit being connected to battery unit two ends and the 2nd RC filtering circuit, and the voltage stabilizing diode in parallel with a RC filtering circuit and the 2nd RC filtering circuit, as shown in Figure 1.Voltage between this circuit a node and b node is the voltage of described battery unit.The filtering circuit that the metering circuit at these circuit battery unit two ends is mainly made up of RC, and the transient overvoltage having voltage stabilizing diode to form suppresses.The voltage stabilizing diode of described voltage stabilizing diode and battery management system chip inside is in parallel.Under operation condition, when after battery pole ear fracture, because battery unit two ends hang with load, thus on the voltage measurement interface circuit that is connected of the battery unit making the terminal voltage of high-tension battery group directly be added in rupture with current lug.The high-pressure side voltage of high-tension battery group (is eliminated voltage stabilizing diode by the voltage stabilizing diode formation loop of two resistance and a forward conduction and can not be blocked loop, because the chip internal of battery management system has similar diode to exist), cause overcurrent, thus the relevant components and parts damaged on voltage measurement interface circuit, cause battery management unit (Battery Management Unit, BMU) circuit burnout, and then cause the short circuit between battery sampling line, thus cause battery short circuit to burn.This is the one of the main reasons causing some operation fault of electrical equipment.
Utility model content
The utility model provides a kind of voltage measurement interface circuit of resistance to high back-pressure, solves in vehicle operation and causes BMU to burn the problem even causing cells burst owing to there is battery pole ear fracture, effectively improve the security of system cloud gray model.
A kind of voltage measurement interface circuit of resistance to high back-pressure, comprise: battery unit, be connected to a RC filtering circuit and the 2nd RC filtering circuit at the positive and negative the two poles of the earth of battery unit, and the voltage stabilizing diode in parallel with a RC filtering circuit and the 2nd RC filtering circuit, be connected the first high withstand voltage diode between battery unit positive pole with a RC filtering circuit, between battery unit negative pole with the 2nd RC filtering circuit, be connected the second high withstand voltage diode.
The withstand voltage of the described first high withstand voltage diode, the withstand voltage of the second high withstand voltage diode are all greater than the total voltage of electric battery.The total voltage of electric battery refers to the voltage sum of several battery units adopting series system to connect, and is the ceiling voltage of electric battery.
The positive pole of the described first high withstand voltage diode is connected with battery unit positive pole, and the positive pole of the described second high withstand voltage diode is connected with battery unit negative pole.
Compared with prior art, the utility model has the following advantages:
Two high withstand voltage diodes are introduced in the voltage measurement interface circuit of the resistance to high back-pressure of the utility model, make to deposit in case in high back-pressure, voltage measurement interface circuit can not form loop, also the possibility of overcurrent is just eliminated, avoid because battery pole ear fracture appears in battery unit and cause BMU to burn the problem even causing cells burst, effectively improve the security of system cloud gray model.
Accompanying drawing explanation
Fig. 1 is existing voltage measurement interface circuit schematic diagram;
Fig. 2 is the voltage measurement interface circuit schematic diagram of the resistance to high back-pressure of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
embodiment 1
As shown in Figure 2, the voltage measurement interface circuit of the resistance to high back-pressure of the utility model, comprise: battery unit, the RC filtering circuit be connected with battery unit positive pole, the 2nd RC filtering circuit be connected with battery unit negative pole, and the voltage stabilizing diode ZD1 in parallel with a RC filtering circuit and the 2nd RC filtering circuit, be connected the first high withstand voltage diode D2 between battery unit positive pole with a RC filtering circuit, between battery unit negative pole with the 2nd RC filtering circuit, be connected the second high withstand voltage diode D3.
The withstand voltage of the first high withstand voltage diode D2 is greater than the total voltage of electric battery, and the withstand voltage of the second high withstand voltage diode D3 is greater than the total voltage of electric battery.The total voltage of electric battery refers to the voltage sum of several battery units VCn to VCn-1 adopting series system to connect, and is the ceiling voltage of electric battery in battery management system.
One RC filtering circuit is made up of the resistance R1 connected and electric capacity C1; Resistance R1 one end is connected with the negative pole of the first high withstand voltage diode D2, and the other end is connected with the negative pole of electric capacity C1 one end and voltage stabilizing diode ZD1; The other end ground connection of electric capacity C1.2nd RC filtering circuit is made up of the resistance R2 connected and electric capacity C2; Resistance R2 one end is connected with the negative pole of the second high withstand voltage diode D3, and the other end is connected with the positive pole of electric capacity C2 one end and voltage stabilizing diode ZD1; The other end ground connection of electric capacity C2.
Voltage between this circuit a node and b node is the voltage of battery unit.
The voltage measurement interface circuit of the resistance to high back-pressure of the utility model can repeat to arrange multiple Cn to VC (n-1).N is positive integer.
Such as, under state's net standard cell, the electric battery of a general standard electric passenger vehicle has the battery unit adopting series system to connect 4 more, altogether 320V nominal voltage.In the voltage measurement interface circuit of the resistance to high back-pressure of each single bag battery unit, resistance R1 is 100 Ω, resistance R2 is 100 Ω, electric capacity C1 is 100nF, electric capacity C2 is 100nF, voltage stabilizing diode ZD1 is 7.5V, and the withstand voltage of the first high withstand voltage diode D2 can be 1000V, and the withstand voltage of the second high withstand voltage diode D3 can be 1000V.
Two high withstand voltage diodes are introduced in the voltage measurement interface circuit of the resistance to high back-pressure of the utility model, make to deposit in case in high back-pressure, voltage measurement interface circuit can not form loop, also the possibility of overcurrent is just eliminated, avoid because battery pole ear fracture appears in battery unit and cause BMU to burn the problem even causing cells burst, effectively improve the security of system cloud gray model.
Claims (3)
1. the voltage measurement interface circuit of a resistance to high back-pressure, comprise: battery unit, be connected to a RC filtering circuit and the 2nd RC filtering circuit at the positive and negative the two poles of the earth of battery unit, and the voltage stabilizing diode in parallel with a RC filtering circuit and the 2nd RC filtering circuit, it is characterized in that: between battery unit positive pole with a RC filtering circuit, be connected the first high withstand voltage diode, between battery unit negative pole with the 2nd RC filtering circuit, be connected the second high withstand voltage diode.
2. voltage measurement interface circuit according to claim 1, is characterized in that: the withstand voltage of the described first high withstand voltage diode, the withstand voltage of the second high withstand voltage diode are all greater than the total voltage of electric battery.
3. voltage measurement interface circuit according to claim 1, is characterized in that: the positive pole of the described first high withstand voltage diode is connected with battery unit positive pole, and the positive pole of the described second high withstand voltage diode is connected with battery unit negative pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420678626.3U CN204287290U (en) | 2014-11-14 | 2014-11-14 | A kind of voltage measurement interface circuit of resistance to high back-pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420678626.3U CN204287290U (en) | 2014-11-14 | 2014-11-14 | A kind of voltage measurement interface circuit of resistance to high back-pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204287290U true CN204287290U (en) | 2015-04-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420678626.3U Active CN204287290U (en) | 2014-11-14 | 2014-11-14 | A kind of voltage measurement interface circuit of resistance to high back-pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204287290U (en) |
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2014
- 2014-11-14 CN CN201420678626.3U patent/CN204287290U/en active Active
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