CN211374995U - Awakening circuit of power battery module voltage sampling system - Google Patents
Awakening circuit of power battery module voltage sampling system Download PDFInfo
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- CN211374995U CN211374995U CN201921622989.4U CN201921622989U CN211374995U CN 211374995 U CN211374995 U CN 211374995U CN 201921622989 U CN201921622989 U CN 201921622989U CN 211374995 U CN211374995 U CN 211374995U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides a power battery module voltage sampling system wake-up circuit, MCU control module's SPI sending module corresponds with the low pressure side of isolating the chip and is connected, the high pressure side of isolating the chip is connected with voltage sampling chip's SPI receiving module is corresponding, voltage sampling chip passes through the relevant voltage data of sampling pencil collection power battery module, MCU control module's IO module concatenates the base of connecting the NPN triode behind resistance R1, the projecting pole of NPN triode connects low voltage ground, the negative pole of the emitting diode of light MOS pipe is connected to the collecting electrode of NPN triode, connect the low voltage power behind the emitting diode's of light MOS pipe positive pole concatenate resistance R2, the positive terminal of connecting the power battery module behind the switch of light MOS pipe concatenates resistance R3, the negative pole termination high voltage ground of power battery module, the other end of the switch of light MOS pipe concatenates resistance R4 on being connected to voltage sampling chip's the CS1 signal line of SPI receiving module. The utility model discloses simple structure, safe and reliable.
Description
Technical Field
The utility model relates to a power battery module voltage sampling system awakens circuit up.
Background
The power battery module is a key power output source in the field of energy-saving and new energy automobiles, and the accurate and real-time monitoring of the battery voltage of the power battery module is the key of the safety design of a battery management system. In some power battery module voltage sampling systems seen in the market, an additional DCDC power supply chip is added to realize power supply isolation of a high-voltage side and a low-voltage side, and although the isolation requirements can be met, the system cost is increased; or although the power battery module is used for supplying power, the power battery module is always in a working state due to the fact that a reliable dormancy and wake-up circuit is not arranged, electric energy loss is caused, working efficiency is reduced, if the power battery module runs for a long time, the performance of the power battery module can be influenced, and the service life of the power battery module is greatly shortened.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a simple structure, safe and reliable's power battery module voltage sampling system awaken circuit.
The method is realized by the following scheme:
a wake-up circuit of a power battery module voltage sampling system comprises an MCU control module (namely a singlechip control module), an isolation chip, a voltage sampling chip and a light MOS tube, wherein an SPI (serial peripheral interface) sending module of the MCU control module is correspondingly connected with a low-voltage side of the isolation chip, a high-voltage side of the isolation chip is correspondingly connected with an SPI receiving module of the voltage sampling chip, a low-voltage side power supply of the isolation chip is provided by a low-voltage power supply (namely a whole vehicle lead-acid storage battery), the voltage sampling chip collects related voltage data of the power battery module through a sampling wire harness, the power supply of the voltage sampling chip is provided by the power battery module, an IO module of the MCU control module is connected with a base electrode of an NPN triode after being connected with a resistor R1 in series, an emitting electrode of the NPN triode is connected with a low-voltage ground, and a collecting electrode of, the anode of the light emitting diode of the light MOS tube is connected with a low-voltage power supply after being connected with a resistor R2 in series, one end of a switch of the light MOS tube is connected with the anode end of the power battery module after being connected with a resistor R3 in series, the cathode end of the power battery module is connected with a high-voltage ground, and the other end of the switch of the light MOS tube is connected with a resistor R4 in series and then is connected to a CS1 signal line of an SPI receiving module of a voltage sampling chip. The utility model discloses in, voltage sampling chip is a main component of power battery module voltage sampling system.
Further, the transient suppression device comprises a transient suppression tube TVS, wherein the anode of the transient suppression tube is connected to the connection end of the resistor R4 and the CS1 signal line of the SPI receiving module of the voltage sampling chip, and the cathode of the transient suppression tube is connected to a high-voltage ground.
Furthermore, the cutoff voltage Vrwm of the transient suppression tube is 5.1V-5.6V.
Furthermore, the load voltage of the light MOS tube is more than 600V, the load current is more than 80mA, the insulation voltage between input and output is more than 3750V, and the working driving current of the light emitting diode of the light MOS tube is 2-5 mA.
Furthermore, the resistor R1 is a base current limiting resistor with a resistance value of 1.0-5.1K omega; the resistor R2 is a current-limiting resistor with the resistance value of 510 omega-2.2K omega; the resistance values of the resistor R3 and the resistor R4 are the same and are both 180-300K omega.
The utility model discloses a power battery module voltage sampling system wake-up circuit, through MCU control module, the NPN triode, light MOS pipe, the dormancy and the awakening of power battery module voltage sampling system are realized to the mutually supporting of isolation chip and voltage sampling chip, both can guarantee at power battery module during operation, the voltage that can make full use of power battery module self is the power supply of voltage sampling chip, do not need additionally to increase the DCDC device, therefore, the cost is reduced, can pass through dormancy and wake-up mechanism again, realize the rational utilization of power battery module voltage, reduce the loss and improve the life of power battery module, wake-up signal and communication signal all adopt isolation measure simultaneously, the safe and reliable of dormancy and wake-up mechanism has been ensured.
The utility model discloses a power battery module voltage sampling system awakens circuit up has following advantage:
1. when the control strategy requires the power battery module voltage sampling system to be dormant, the MCU control module sends a dormancy instruction through the SPI bus to enable the voltage sampling chip to be in a low power consumption mode, so that the voltage loss of the power battery module is reduced, over-discharge is prevented, and the power battery module is effectively protected;
2. the structure is simple, the safety and the reliability are realized, the awakening driving signal and the SPI serial communication signal of the utility model are electrically isolated, the signals on the high and low voltage sides are ensured not to interfere, and the safety of the whole loop and the device is ensured;
3. the voltage of the power battery module is adopted to supply power to the voltage sampling chip, and a DCDC isolation device does not need to be additionally arranged, so that the cost is reduced;
4. the voltage amplitudes of the wake-up signals are reasonably matched, so that the wake-up can be reliably awakened, and the safety of awakened devices can be guaranteed;
5. the high-voltage side power ground and the low-voltage side power ground are completely separated, and the isolation voltage is up to 2.5 KV.
Drawings
Fig. 1 is a schematic diagram of a frame of a wake-up circuit of a voltage sampling system of a power battery module in embodiment 1.
Detailed Description
The embodiment is only for illustrating one implementation of the present invention, and is not to be taken as a limiting illustration of the protection scope of the present invention.
Example 1
A wake-up circuit of a power battery module voltage sampling system comprises an MCU control module (namely a single chip microcomputer control module) U1, an isolation chip U2, a voltage sampling chip U3, a light MOS tube Q2 and a transient suppression tube TVS D1, wherein the load voltage of the light MOS tube Q2 is more than 600V, the load current is more than 80mA, the insulation voltage between input and output is more than 3750V, the working driving current of a light emitting diode of the light MOS tube Q2 is 2-5 mA, the cut-off voltage Vrwm of the transient suppression tube is 5.1V-5.6V, an SPI sending module 1 of the MCU control module U1 is correspondingly connected with the low-voltage side of the isolation chip U2, the high-voltage side of the isolation chip U2 is correspondingly connected with an SPI receiving module 3 of the voltage sampling chip U3, the low-voltage side power supply of the isolation chip U2 is provided by a low-voltage power supply VCC (namely a whole vehicle 12V lead-shaped battery), the voltage sampling chip U3 collects data of the power battery module through a sampling harness 5, the power supply of the voltage sampling chip U3 is provided by the power battery module 4, the IO module 2 of the MCU control module U1 is connected in series with the resistor R1 and then connected with the base of the NPN triode Q1, the resistor R1 is a base current-limiting resistor with the resistance value of 1.0-5.1K Ω, the emitter of the NPN triode Q1 is connected with the low-voltage ground GND1, the collector of the NPN triode Q1 is connected with the cathode of the light emitting diode of the photo MOS tube Q2, the anode of the light emitting diode of the photo MOS tube Q2 is connected in series with the resistor R2 and then connected with the low-voltage power supply VCC, the resistor R2 is a current-limiting resistor with the resistance value of 510 Ω -2.2K Ω, one end of the switch of the photo MOS tube Q2 is connected in series with the resistor R3 and then connected with the positive terminal of the power battery module 4, the negative terminal of the power battery module 4 is connected with the high-voltage ground GND2, the other end of the switch of the photo MOS tube is connected in series with the resistor R4, all values are taken from 180-300K omega, the anode of the transient suppression tube TVS D1 is connected to the connection end of the resistor R4 and the CS1 signal line of the SPI receiving module 3 of the voltage sampling chip U3, and the cathode of the transient suppression tube TVS D1 is connected to the high-voltage ground GND 2.
In actual work, the wake-up mechanism is carried out according to the following steps:
i, initial state: in an initial state, an IO module of the MCU control module outputs a low level, an NPN triode Q1 works in a cut-off state, and no current flows through a light emitting diode of a light MOS tube, so that the light MOS tube does not work, a switch of the light MOS tube is disconnected, a branch circuit of a CS1 signal line loaded by the voltage of the power battery module is disconnected, a level V1 on a CS1 signal line of an SPI receiving module of a voltage sampling chip is in a suspended state, and a wake-up signal CS1 is in a low level state;
II, a dormant state: the dormancy state of the power battery module voltage sampling system is required according to a power battery module control strategy, when the voltage output of the power battery module is not used, in order to reduce the loss of the power battery module to the maximum extent, the power battery module voltage sampling system is required to be in a dormancy mode, under the mode, the MCU control module sends a dormancy instruction through the SPI to enable the module voltage sampling system to be in the dormancy mode, the power supply VDD of the voltage sampling chip is 0V, the voltage sampling chip does not work, at the moment, a communication signal between the SPI sending module of the MCU control module and the SPI receiving module of the voltage sampling chip is in an idle state, and a CS1 signal is at a low level. When the power battery module is in a dormant state, the IO module of the MCU control module maintains a low level, the NPN triode Q1 works in a cut-off state, no current flows through a light emitting diode of the light MOS tube, a switch of the light MOS tube is disconnected, a branch of a CS1 signal line loaded by the voltage of the power battery module is disconnected, and the CS1 signal line level V1 of the SPI receiving module of the voltage sampling chip is in a suspended state;
III, awakening the working mode: when the voltage sampling system of the power battery module needs to be awakened, the IO module of the MCU control module outputs high level, the NPN triode Q1 is in saturated conduction, when the current flows through the light emitting diode of the light MOS tube, the light MOS tube works, the switch of the light MOS tube is conducted, the voltage of the power battery module is applied to the CS1 signal line of the SPI receiving module of the voltage sampling chip through the resistor R3, the switch of the light MOS tube Q2, the resistor R4 and the transient suppression tube D1, at the moment, the awakening signal V1 is high level, the CS1 is converted from low level to high level, at the moment, the SPI receiving module of the voltage sampling chip receives the CS1 excitation signal, the power supply VDD of the voltage sampling chip is changed from 0V to 5V, the voltage sampling system of the power battery module is awakened, and the MCU control module and the voltage sampling chip are in normal communication through SPI.
In this series of operations, two paths are mainly formed, the first path being a path of the low voltage power supply VCC, the resistor R2, the light emitting diode of the photo MOS transistor, the NPN transistor Q1, and the low voltage ground GND 1. The second is a path for forming a power battery module, a resistor R3, a switch of a light MOS tube, a resistor R4 and a transient suppression tube D1. The operating voltage and current conditions of these two paths are analyzed separately as follows:
the first path is: setting a low-voltage power supply VCC to take a value of 5V, a resistor R2 to take a value of 1K omega, an NPN triode Q1 saturated conduction voltage Vcs to be 0.6V, a light emitting diode conduction voltage Vd of a light MOS tube to be 0.6V, and a path current Id:
the IO module of the MCU control module outputs high level, and the NPN triode Q1 is in saturated conduction:
because the work driving current of the light emitting diode of the light MOS tube is 2-5 mA, and Id is in the work interval of the light emitting diode, the light MOS tube is reliably conducted.
The second path is as follows: after the switch of the optical MOS transistor is turned on, a path for isolating the high-voltage side of the battery core is formed, the voltage of the power battery module is Vbatt ═ 43.8V (assuming that the power battery module is composed of 12 single lithium battery cells), the values of the resistor R3 and the resistor R4 are both 200K Ω, and the reverse turn-off voltage of the transient suppression transistor D1 is 5.6V, so that when the optical MOS transistor is turned on, the potential of the level V1 can be clamped at 5.6V, and the signal line of the SPI receiving module of the voltage sampling chip can be ensured to work in a normal voltage range.
After power battery module voltage sampling system is awakened up, just can normally pass through SPI communication between MCU control module and the voltage sampling chip, at this moment the IO module output low level of MCU control module, make the switch of light MOS pipe turn-off, cut off resistance R3 and resistance R4 link, remove the excitation of high-pressure side awakening signal, power battery module voltage sampling system gets back to initial condition as I describes again.
Claims (5)
1. The utility model provides a power battery module voltage sampling system awakens circuit which characterized in that: the high-voltage isolation power supply comprises an MCU control module, an isolation chip, a voltage sampling chip and a light MOS tube, wherein an SPI (serial peripheral interface) sending module of the MCU control module is correspondingly connected with a low-voltage side of the isolation chip, a high-voltage side of the isolation chip is correspondingly connected with an SPI receiving module of the voltage sampling chip, a low-voltage side power supply of the isolation chip is provided by a low-voltage power supply, the voltage sampling chip collects relevant voltage data of a power battery module through a sampling wire harness, the power supply of the voltage sampling chip is provided by the power battery module, an IO (input/output) module of the MCU control module is connected with a base electrode of an NPN (negative-positive) triode after being connected with a resistor R1 in series, an emitting electrode of the NPN triode is connected with a low-voltage ground, a collector electrode of the NPN triode is connected with a cathode of a light emitting diode of the light MOS tube, an anode of the light emitting diode of the light, the negative electrode end of the power battery module is connected with a high-voltage ground, and the other end of the switch of the light MOS tube is connected with a resistor R4 in series and then is connected to a CS1 signal wire of an SPI receiving module of the voltage sampling chip.
2. The power battery module voltage sampling system wake-up circuit of claim 1, wherein: the voltage sampling device further comprises a transient suppression tube, wherein the anode of the transient suppression tube is connected to the connection end of the resistor R4 and the CS1 signal line of the SPI receiving module of the voltage sampling chip, and the cathode of the transient suppression tube is connected to a high-voltage ground.
3. The power battery module voltage sampling system wake-up circuit of claim 2, wherein: the cutoff voltage Vrwm of the transient suppression tube is 5.1V-5.6V.
4. The power battery module voltage sampling system wake-up circuit of claim 1, wherein: the load voltage of the light MOS tube is more than 600V, the load current is more than 80mA, the insulation voltage between input and output is more than 3750V, and the working driving current of the light emitting diode of the light MOS tube is 2-5 mA.
5. The power battery module voltage sampling system wake-up circuit of any one of claims 1 to 4, wherein: the resistor R1 is a base current limiting resistor with the resistance value of 1.0-5.1K omega; the resistor R2 is a current-limiting resistor with the resistance value of 510 omega-2.2K omega; the resistance values of the resistor R3 and the resistor R4 are the same and are both 180-300K omega.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921622989.4U CN211374995U (en) | 2019-09-27 | 2019-09-27 | Awakening circuit of power battery module voltage sampling system |
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| CN201921622989.4U CN211374995U (en) | 2019-09-27 | 2019-09-27 | Awakening circuit of power battery module voltage sampling system |
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| CN211374995U true CN211374995U (en) | 2020-08-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115001090A (en) * | 2022-06-09 | 2022-09-02 | 重庆长安新能源汽车科技有限公司 | Circuit and method for controlling remote communication power supply through single chip microcomputer and vehicle |
| WO2024187433A1 (en) * | 2023-03-15 | 2024-09-19 | 浙江极氪智能科技有限公司 | High-voltage sampling circuit, high-voltage sampling method, and battery management system |
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2019
- 2019-09-27 CN CN201921622989.4U patent/CN211374995U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115001090A (en) * | 2022-06-09 | 2022-09-02 | 重庆长安新能源汽车科技有限公司 | Circuit and method for controlling remote communication power supply through single chip microcomputer and vehicle |
| WO2024187433A1 (en) * | 2023-03-15 | 2024-09-19 | 浙江极氪智能科技有限公司 | High-voltage sampling circuit, high-voltage sampling method, and battery management system |
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Effective date of registration: 20230504 Address after: 410221 No. 348, Tongzipo West Road, Changsha High tech Development Zone, Changsha City, Hunan Province Patentee after: HUNAN COPOWER EV BATTERY Co.,Ltd. Address before: 528000 No.1, ChanGang North Road, Nanzhuang Town, Chancheng District, Foshan City, Guangdong Province Patentee before: CORUN HYBRID POWER TECHNOLOGY Co.,Ltd. |