CN220171421U - Communication wake-up circuit and chip of battery management system - Google Patents
Communication wake-up circuit and chip of battery management system Download PDFInfo
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- CN220171421U CN220171421U CN202320964536.XU CN202320964536U CN220171421U CN 220171421 U CN220171421 U CN 220171421U CN 202320964536 U CN202320964536 U CN 202320964536U CN 220171421 U CN220171421 U CN 220171421U
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- 238000001514 detection method Methods 0.000 claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims abstract description 24
- 230000007958 sleep Effects 0.000 claims description 14
- 230000005059 dormancy Effects 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 2
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
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Abstract
The utility model provides a communication wake-up circuit and a chip of a battery management system, wherein the communication wake-up circuit comprises an MCU (micro control unit), an LDO (low dropout regulator), an isolator, a first capacitor and a first resistor, the MCU comprises a power supply pin, a first wake-up pin, a control unit, a signal detection unit and a first switch, the control unit is electrically connected with the signal detection unit and the first switch, and the signal detection unit is electrically connected with the first wake-up pin through the first switch; the power supply pin is electrically connected with the battery through an LDO; the LDO is electrically connected with the first capacitor through the isolator, the first capacitor is electrically connected with the first wake-up pin, two ends of the first resistor are respectively electrically connected with the differential communication bus, when the differential communication bus transmits data, the first resistor generates differential voltage to drive the isolator to be conducted, the LDO charges the first capacitor to control the first wake-up pin to generate a first wake-up signal, and the control unit controls the MCU to enter a wake-up state; the control unit also controls the first switch to be turned on or off.
Description
Technical Field
The present utility model relates to the field of battery management systems, and in particular, to a communication wake-up circuit and a communication wake-up chip for a battery management system.
Background
In the field of new energy batteries such as electric vehicles and energy storage, a battery management system (Battery Management System, BMS) is required to monitor the state of health of the battery and protect the charge and discharge of the battery. The lithium battery system needs to enter a sleep mode to reduce power consumption in long-distance transportation, storage and non-working states, and the sleep mode needs to keep the awakening capability through level or communication.
At present, the conventional communication wake-up scheme includes a controller area network (Controller Area Network, CAN) chip of an encarpium (NXP), such as TJA1043, TJA1145, and the like, and a CAN chip of a Texas Instruments (TI), such as TCAN1043, TCAN1145, and the like, and the CAN wake-up chip is generally used in a 12V system, and the maximum withstand voltage is generally lower than 40V, and the cost is relatively high. In the energy storage multi-battery parallel operation use scene, when a certain battery box cell is seriously over-discharged, other battery boxes on the communication bus still continuously send data, so that the BMS can not enter a sleep mode. Meanwhile, the base station energy storage generally uses an RS485 bus, and the CAN communication awakening scheme is not applicable.
Disclosure of Invention
The utility model aims to overcome the defects that a communication awakening scheme of a battery management system in the prior art CAN only be applied to a 12V system, CAN only support CAN communication but not be applied to an RS485 bus, and CAN still enter a sleep mode when communication is not effective.
The utility model solves the technical problems by the following technical scheme:
the utility model provides a communication wake-up circuit of a battery management system, which comprises a Micro Control Unit (MCU) of the battery management system, wherein the MCU comprises a power supply pin, a first wake-up pin, a control unit, a signal detection unit and a first switch, the control unit is respectively and electrically connected with the signal detection unit and the first switch, and the signal detection unit is electrically connected with the first wake-up pin through the first switch;
the communication wake-up circuit also comprises an LDO (low dropout linear regulator), and the power supply pin is electrically connected with the battery through the LDO;
the communication wake-up circuit further comprises an isolator, a first capacitor and a first resistor, wherein the LDO is electrically connected with the first capacitor through the isolator, the first capacitor is also electrically connected with the first wake-up pin, two ends of the first resistor are respectively and electrically connected with two ends of a differential communication bus of the battery management system, and the isolator is also connected with the first resistor in parallel;
when the differential communication bus transmits data, the first resistor is used for generating differential voltage, the differential voltage is used for driving the isolator to be conducted, the LDO is used for charging the first capacitor through the isolator, the first capacitor is used for controlling the first wakeup pin to generate a first wakeup signal when the voltage reaches a high level threshold value of the first wakeup pin, the signal detection unit is used for detecting the first wakeup signal when the first switch is conducted and transmitting the first wakeup signal to the control unit, and the control unit is used for controlling the MCU to enter a wakeup state according to the first wakeup signal;
the control unit is also used for controlling the first switch to be turned on or turned off.
Preferably, the MCU further comprises a second wake-up pin, and the signal detection unit is electrically connected with the second wake-up pin;
the communication wake-up circuit also comprises a button switch, a second resistor and a third resistor;
the second wake-up pin is respectively and electrically connected with the button switch and the second resistor, the second resistor is grounded, and the button switch is electrically connected with the battery through the third resistor;
the button switch is used for controlling the second wake-up pin to generate a second wake-up signal after being conducted, the signal detection unit is used for transmitting the second wake-up signal to the control unit after detecting the second wake-up signal, and the control unit is used for controlling the MCU to enter a wake-up state according to the second wake-up signal.
Preferably, the communication wake-up circuit further comprises a first diode, wherein the positive electrode of the first diode is electrically connected with the battery, and the negative electrode of the first diode is electrically connected with the LDO.
Preferably, the communication wake-up circuit further comprises a fourth resistor, and the fourth resistor is electrically connected with the high-level output end of the differential communication bus.
Preferably, the isolator comprises a photo coupler.
Preferably, the communication wake-up circuit further comprises a second diode, wherein the positive electrode of the second diode is electrically connected with the low-level output end of the differential communication bus, and the negative electrode of the second diode is electrically connected with the high-level output end of the differential communication bus;
the second diode is connected in parallel with the photocoupler.
Preferably, the isolator comprises a digital isolator.
Preferably, the communication wake-up circuit further comprises a triode, wherein a base electrode of the triode is electrically connected with a high-level output end of the differential communication bus, a collector electrode of the triode is electrically connected with an external power supply and an input side anode of the digital isolator respectively, and an emitter electrode of the triode is electrically connected with an input side cathode of the digital isolator and a low-level output end of the differential communication bus respectively.
Preferably, the MCU further comprises a voltage detection unit, and the voltage detection unit is electrically connected with the control unit;
the voltage detection unit is used for detecting the voltage of the battery and sending a dormancy signal to the control unit when detecting that the voltage of the battery is lower than a preset threshold value for a preset duration;
the control unit is used for controlling the first switch to be disconnected and controlling the MCU to enter a sleep state according to the sleep signal.
The utility model also provides a communication wake-up chip of the battery management system, which comprises the communication wake-up circuit of the battery management system.
The utility model has the positive progress effects that:
the utility model realizes the communication awakening mode by controlling the first switch to be conducted, and shields the communication awakening mode by controlling the first switch to be disconnected, thereby realizing the adjustability of the communication awakening function, and shielding the communication awakening mode when the battery is in sleep due to overdischarge. In addition, the utility model realizes the multi-path pin wake-up function of the MCU, and has a mode of waking up through a button besides a communication wake-up mode; meanwhile, the communication wake-up circuit also supports wake-up modes using various differential communication buses such as CAN, RS485 and the like, and CAN be suitable for various voltage platforms such as 12V, 24V, 48V and other systems by selecting LDOs of different types.
Drawings
Fig. 1 is a schematic circuit diagram of a communication wake-up circuit of a battery management system according to embodiment 1 of the present utility model.
Fig. 2 is a schematic diagram of the structure of the MCU in the communication wake-up circuit of the battery management system according to embodiment 1 of the present utility model.
Fig. 3 is a schematic circuit diagram of a communication wake-up circuit of the battery management system according to embodiment 2 of the present utility model.
Detailed Description
The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.
Example 1
As shown in fig. 1-2, the communication WAKE-up circuit of a battery management system provided by the utility model comprises an MCU of the battery management system, wherein the MCU comprises a power supply pin VDD, a first WAKE-up pin WAKE1, a control unit 1, a signal detection unit 2 and a first switch 3, the control unit 1 is respectively and electrically connected with the signal detection unit 2 and the first switch 3, and the signal detection unit 2 is electrically connected with the first WAKE-up pin WAKE1 through the first switch 3;
the communication wake-up circuit further comprises an LDO, an isolator U1, a first capacitor C1 and a first resistor R1, wherein the power supply pin VDD is electrically connected with a battery BAT through the LDO, and the battery is further grounded; the LDO is electrically connected with the first capacitor C1 through the isolator U1, the first capacitor C1 is also electrically connected with the first WAKE-up pin WAKE1, two ends of the first resistor R1 are respectively electrically connected with two ends of a differential communication bus of the battery management system, and the isolator U1 is also connected with the first resistor R1 in parallel;
the LDO is used for reducing the voltage of the battery to VCC, the MCU is powered by the VCC, and the MCU has a communication awakening function.
In this embodiment, the differential communication bus may specifically be a CAN bus or an RS485 bus, as shown in fig. 1, when the differential communication bus is a CAN bus, two ends of the first resistor R1 are respectively connected to a high-level output end CANH and a low-level output end CANL of the differential communication bus; and when the bus is an RS485 bus, two ends of the first resistor R1 are respectively connected with a high-level output end RS485_A and a low-level output end RS485_B of the differential communication bus.
The first resistor R1 is used for generating voltage drop to drive the isolator U1 and preventing the isolator U1 from being triggered by mistake when the differential communication bus transmits data, and the isolator U1 is used for isolating the differential communication bus and the MCU;
therefore, when the differential communication bus transmits data, the first resistor R1 is used for generating a differential voltage, the differential voltage is used for driving the isolator U1 to be turned on, the LDO is used for charging the first capacitor C1 through the isolator U1, the first capacitor C1 is used for keeping a wake_up1 high level WAKE-UP signal, the first capacitor C1 is used for controlling the first WAKE-UP pin WAKE1 to generate a first WAKE-UP signal (may be a rising edge signal in particular) when the voltage reaches a high level threshold of the first WAKE-UP pin WAKE1, the signal detection unit 2 is used for detecting the first WAKE-UP signal when the first switch 3 is turned on and transmitting the first WAKE-UP signal to the control unit 1, and the control unit 1 is used for controlling the MCU to enter a WAKE-UP state according to the first WAKE-UP signal, so as to realize a communication WAKE-UP mode;
the control unit 1 is further configured to control the first switch 3 to be turned on or turned off, and when the first switch 3 is controlled to be turned off, the signal detection unit 2 cannot detect the first wake-up signal, so that the control unit 1 cannot receive the first wake-up signal even when the differential communication bus transmits data, and a shielded communication wake-up mode can be realized. Therefore, the utility model realizes the communication awakening mode by controlling the first switch to be conducted, and shields the communication awakening mode by controlling the first switch to be disconnected, thereby realizing the adjustability of the communication awakening function, and shielding the communication awakening mode when the battery is in dormancy due to overdischarge.
In a preferred embodiment, the MCU further includes a second WAKE-up pin WAKE2, and the signal detection unit 2 is electrically connected to the second WAKE-up pin WAKE 2;
the communication wake-up circuit also comprises a button switch S1, a second resistor R2 and a third resistor R3;
the second WAKE pin WAKE2 is electrically connected to the button switch S1 and the second resistor R2, the second resistor R2 is grounded, and the button switch S1 is electrically connected to the battery BAT through the third resistor R3;
the button switch S1 is configured to generate a wake_up2 rising edge signal after being turned on, so as to control the second WAKE pin WAKE2 to generate a second WAKE signal (specifically may be a rising edge signal), the signal detection unit 2 is configured to transmit the second WAKE signal to the control unit 1 after detecting the second WAKE signal, and the control unit 1 is configured to control the MCU to enter a WAKE state according to the second WAKE signal, thereby implementing a WAKE-UP manner by a button, so that the MCU also has a button WAKE-UP function, and the communication WAKE-UP circuit of the present utility model has a multi-channel pin WAKE-UP function for the MCU.
In a preferred embodiment, the communication wake-up circuit further includes a first diode D1, where an anode of the first diode D1 is electrically connected to the battery BAT, and a cathode of the first diode D1 is electrically connected to the LDO, so that anti-reflection is achieved through the first diode D1.
In a preferred embodiment, the communication wake-up circuit further includes a fourth resistor R4, where the fourth resistor R4 is electrically connected to the high level output terminal (CANH/RS 485_a) of the differential communication bus, and the driving current limiting of the isolator is implemented through the fourth resistor.
In a preferred embodiment, the isolator U1 specifically includes a photo-coupler, the communication wake-up circuit further includes a second diode D2, where an anode of the second diode D2 is electrically connected to the low-level output terminal of the differential communication bus, and a cathode of the second diode D2 is electrically connected to the high-level output terminal of the differential communication bus; the second diode D2 is connected in parallel with the optocoupler. The second diode D2 is used for reverse connection protection of the photoelectric coupler. In addition, the communication wake-up circuit further includes a fifth resistor R5 and a sixth resistor R6, where the fifth resistor R5 is further electrically connected to the LDO, and the sixth resistor R6 is further connected in parallel to the first capacitor C1, and the fifth resistor R5 and the sixth resistor R6 are electrically connected to the collector and the emitter of the switch-side triode of the photocoupler, respectively.
In addition, in a preferred embodiment, the MCU further comprises a voltage detection unit 4, and the voltage detection unit 4 is electrically connected to the control unit 1;
the voltage detection unit 4 is configured to detect a voltage of the battery BAT, and send a sleep signal to the control unit 1 when detecting that the voltage of the battery is lower than a preset threshold for a preset period of time;
the control unit 1 is used for controlling the first switch 3 to be opened and controlling the MCU to enter a sleep state according to the sleep signal.
The specific working principle of the utility model is as follows:
the LDO reduces the voltage of the battery BAT to VCC, the MCU uses VCC to supply power normally, and under the sleep mode, the communication awakening principle is as follows: when data exist on the differential communication bus, a potential difference exists on the first resistor R1, the switch side of the photoelectric coupler is driven to be closed, VCC charges the first capacitor C1 after being limited by the fifth resistor R5 and the sixth resistor R6, and when the voltage of the first capacitor C1 and the WAKE_UP1 signal reach the high level threshold value of the first WAKE-UP pin WAKE1 of the MCU, the control unit detects that the first WAKE-UP pin WAKE1 generates an effective rising edge signal and then controls the MCU to enter a WAKE-UP state.
The principle of button awakening is as follows: when the button switch S1 is pressed, the second resistor R2 and the third resistor R3 are divided, the button switch S1 is used for generating a wake_up2 rising edge signal after being turned on, and the control unit detects that the second WAKE pin WAKE2 generates an effective rising edge signal and controls the MCU to enter a WAKE state.
The dormancy flow without communication is as follows: when the control unit detects that the button switch S1 is not pressed (WAKE_UP2 is at a low level) and no communication exists (the first WAKE-UP pin WAKE1 is at a low level), the MCU is controlled to enter a sleep mode, and the communication WAKE-UP function and the button WAKE-UP function are reserved.
The dormancy flow when there is communication is as follows: when the control unit detects that the button switch S1 is not pressed (wake_up2 is at a low level) and the battery is severely overdischarged and needs to be dormant (i.e. the voltage of the battery is lower than a preset threshold value for a preset duration), the control unit controls the MCU to enter a dormant mode, and the first switch is controlled to be turned off to shield a communication WAKE-UP function, and the button WAKE-UP function is still reserved.
Example 2
As shown in fig. 3, this embodiment also provides a communication wake-up circuit of a battery management system, which is substantially the same as embodiment 1, except that: in this embodiment, the isolator U1 specifically includes a digital isolator, the communication wake-up circuit further includes a triode Q1, a base electrode of the triode Q1 is electrically connected with a high-level output end of the differential communication bus, a collector electrode of the triode Q1 is electrically connected with an external power supply (ISO 5V) and an input side Anode (inode) of the digital isolator, an emitter electrode of the triode Q1 is electrically connected with an input side Cathode (captode) of the digital isolator and a low-level output end of the differential communication bus, and specifically, the emitter electrode of the triode Q1 is electrically connected with the low-level output end of the differential communication bus through a first resistor R1.
In addition, in this embodiment, the output side power supply terminal VDD1 of the digital isolator is electrically connected to the LDO, the output terminal VO is electrically connected to the first capacitor C1, and a resistor is further connected between the output side power supply terminal VDD1 and the output terminal VO.
In this embodiment, when there is no data on the differential communication bus, the triode Q1 is turned off, the voltage difference between the Anode and the Cathode of the digital isolator is 5V, and the output terminal VO of the digital isolator is at low level (i.e. wake_up1 is low); when there is data on the differential communication bus, the differential level drives the triode Q1 to be closed through the fourth resistor R4, the voltage difference of Vce (voltage between the collector and the emitter) is triode saturation voltage drop (typical value 0.3V), the emitter voltage (i.e. Input port voltage) is 0.3V, which is smaller than the digital isolator opening threshold, and VO output is high level (i.e. wake_up1 is high), so that the first WAKE-UP pin can be controlled to generate the first WAKE-UP signal to realize the communication WAKE-UP function.
Of course, the mode of turning on the communication wakeup function or turning off the communication wakeup function in this embodiment is the same as that of embodiment 1 (i.e. the first switch is turned on or off by the control unit), and the mode of implementing the button wakeup function by the button switch S1 is also the same as that of embodiment 1, and will not be described again here.
Example 3
The embodiment provides a communication wake-up chip of a battery management system, which comprises a communication wake-up circuit of the battery management system in embodiment 1 or embodiment 2.
The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the utility model, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. The communication wake-up circuit of the battery management system is characterized by comprising an MCU of the battery management system, wherein the MCU comprises a power supply pin, a first wake-up pin, a control unit, a signal detection unit and a first switch, the control unit is respectively and electrically connected with the signal detection unit and the first switch, and the signal detection unit is electrically connected with the first wake-up pin through the first switch;
the communication wake-up circuit further comprises an LDO, and the power supply pin is electrically connected with the battery through the LDO;
the communication wake-up circuit further comprises an isolator, a first capacitor and a first resistor, wherein the LDO is electrically connected with the first capacitor through the isolator, the first capacitor is also electrically connected with the first wake-up pin, two ends of the first resistor are respectively and electrically connected with two ends of a differential communication bus of the battery management system, and the isolator is also connected with the first resistor in parallel;
when the differential communication bus transmits data, the first resistor is used for generating differential voltage, the differential voltage is used for driving the isolator to be conducted, the LDO is used for charging the first capacitor through the isolator, the first capacitor is used for controlling the first wakeup pin to generate a first wakeup signal when the voltage reaches a high level threshold value of the first wakeup pin, the signal detection unit is used for detecting the first wakeup signal when the first switch is conducted and transmitting the first wakeup signal to the control unit, and the control unit is used for controlling the MCU to enter a wakeup state according to the first wakeup signal;
the control unit is also used for controlling the first switch to be turned on or turned off.
2. The communication wake-up circuit of the battery management system of claim 1, wherein the MCU further comprises a second wake-up pin, the signal detection unit being electrically connected to the second wake-up pin;
the communication wake-up circuit also comprises a button switch, a second resistor and a third resistor;
the second wake-up pin is respectively and electrically connected with the button switch and the second resistor, the second resistor is grounded, and the button switch is electrically connected with the battery through the third resistor;
the button switch is used for controlling the second wake-up pin to generate a second wake-up signal after being conducted, the signal detection unit is used for transmitting the second wake-up signal to the control unit after detecting the second wake-up signal, and the control unit is used for controlling the MCU to enter a wake-up state according to the second wake-up signal.
3. The communication wake-up circuit of the battery management system of claim 1, further comprising a first diode having a positive pole electrically connected to the battery and a negative pole electrically connected to the LDO.
4. The communication wake-up circuit of claim 1 wherein the communication wake-up circuit further comprises a fourth resistor, the fourth resistor being electrically connected to the high level output of the differential communication bus.
5. The communication wake-up circuit of a battery management system of claim 1 wherein the isolator comprises a photo coupler.
6. The communication wake-up circuit of claim 5, wherein the communication wake-up circuit further comprises a second diode, the anode of the second diode is electrically connected to the low-level output terminal of the differential communication bus, and the cathode of the second diode is electrically connected to the high-level output terminal of the differential communication bus;
the second diode is connected in parallel with the photocoupler.
7. The communication wake-up circuit of a battery management system of claim 1 wherein the isolator comprises a digital isolator.
8. The communication wake-up circuit of claim 7, further comprising a transistor, wherein a base of the transistor is electrically connected to the high-level output terminal of the differential communication bus, a collector of the transistor is electrically connected to an external power source and an input side anode of the digital isolator, and an emitter of the transistor is electrically connected to an input side cathode of the digital isolator and a low-level output terminal of the differential communication bus.
9. The communication wake-up circuit of the battery management system of claim 1, wherein the MCU further comprises a voltage detection unit electrically connected to the control unit;
the voltage detection unit is used for detecting the voltage of the battery and sending a dormancy signal to the control unit when detecting that the voltage of the battery is lower than a preset threshold value for a preset duration;
the control unit is used for controlling the first switch to be disconnected and controlling the MCU to enter a sleep state according to the sleep signal.
10. A communication wake-up chip of a battery management system, characterized in that it comprises a communication wake-up circuit of a battery management system according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320964536.XU CN220171421U (en) | 2023-04-25 | 2023-04-25 | Communication wake-up circuit and chip of battery management system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320964536.XU CN220171421U (en) | 2023-04-25 | 2023-04-25 | Communication wake-up circuit and chip of battery management system |
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| CN220171421U true CN220171421U (en) | 2023-12-12 |
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| CN202320964536.XU Active CN220171421U (en) | 2023-04-25 | 2023-04-25 | Communication wake-up circuit and chip of battery management system |
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