Wake-up circuit and battery management system
By detecting charging, communication, and switching signals through a wake-up circuit to generate a power wake-up signal, the power supply status of the woken-up module is controlled, solving the diverse wake-up needs and power consumption issues of users, and achieving diversified wake-up functions and low power consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 深圳智慧动锂电子股份有限公司
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-08
AI Technical Summary
Existing technologies cannot simultaneously meet users' diverse wake-up needs and reduce power consumption.
Design a wake-up circuit including a charging signal module, a communication signal module, a switch signal module, a wake-up source detection module, and a power enable module. By detecting the charging signal, communication signal, and switch status, a power wake-up signal is generated to control the power supply status of the woken-up module, enabling wake-up from multiple wake-up sources and power-off hibernation when ineffective.
It achieves diverse wake-up functions and further reduces power consumption. By using a wake-up source detection module, it can power off and go into sleep mode when there is no wake-up signal, thus reducing power consumption.
Smart Images
Figure CN224218121U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electronic technology, and in particular to a wake-up circuit and a battery management system. Background Technology
[0002] This year, electronic devices have developed rapidly, and users have increasingly higher demands for the intelligence of electronic products. Users rely on the automatic power-on and power-off functions of electronic products based on their needs. Simultaneously, as the functions of electronic products increase, users' wake-up requirements are also evolving. Current single wake-up functions such as power buttons and charging / discharging are no longer sufficient to meet customer needs. Some technologies use MCU sleep mode during idle periods or wake-up via a wake-up source to meet user requirements. While this reduces power consumption to some extent, the power supply still needs to maintain the chip's power circuitry and provide power to the MCU. Therefore, current technologies cannot simultaneously meet both diverse user wake-up needs and reduce power consumption. Summary of the Invention
[0003] To enhance the user's diverse wake-up functionality and further reduce power consumption, this invention proposes a wake-up circuit and a battery management system.
[0004] To achieve the above objectives, this utility model provides a wake-up circuit, comprising: a charging signal module, a communication signal module, a switch signal module, a wake-up source detection module, and a power enable module; the charging signal module is connected to a charging interface and is used to receive a charging signal from the charging interface; the communication signal module is connected to a communication interface and is used to receive a communication signal from the communication interface; the switch signal module is connected to a switch and is used to receive a switch state; the wake-up source detection module is connected to the charging signal module, the communication signal module, and the switch signal module and is used to generate a first power wake-up signal based on the charging signal, the communication signal, and the switch state; the power enable module is connected to the wake-up source detection module and is used to generate a power enable signal based on the first power wake-up signal; the power enable signal is used to control the woken-up module to be powered on for operation or to be powered off for hibernation.
[0005] Optionally, when at least one of the charging signal state, the communication signal state, and the switch state is valid, the first power wake-up signal and the power enable signal are valid, and the woken-up module is powered on to work; otherwise, the first power wake-up signal and the power enable signal are invalid, and the woken-up module is powered off and goes into sleep mode.
[0006] Optionally, the wake-up module includes: a power supply circuit and an MCU; the power supply circuit is connected to the power enable module and the MCU, and the power supply circuit is used to receive the power enable signal from the power enable module and to power or power off the MCU according to the state of the power enable signal.
[0007] Optionally, the wake-up circuit further includes: a charging detection module, a switch detection module, and a wake-up delay module; the charging detection module is connected to the charging signal module and the MCU, and is used to convert the charging signal received by the charging signal module into a charging detection signal; the switch detection module is connected to the switch and the MCU, and is used to convert the switch state into a switch detection signal; the MCU is connected to the wake-up delay module, and is used to generate a wake-up delay signal based on the input charging detection signal, switch detection signal, communication detection signal, and a preset time, and output it to the wake-up delay module; the wake-up delay module is used to generate a second power wake-up signal based on the state of the wake-up delay signal; the power enable module is also connected to the wake-up delay module and is used to generate a power enable signal based on the state of the second power wake-up signal.
[0008] Optionally, the wake-up source detection module includes: a first resistor, a second resistor, a third resistor, a clamping diode, a first transistor, and an output resistor; the first resistor, the second resistor, the third resistor, and the clamping diode are connected in sequence; the emitter and base of the first transistor are respectively connected to the two ends of the first resistor; the emitter of the first transistor is also connected to the positive terminal of the battery to power the wake-up source detection circuit; the collector of the first transistor is connected to the power enable module through the output resistor to output a first power wake-up signal to the power enable module; the cathode of the clamping diode is connected to the positive terminal of the battery, and the anode of the clamping diode is connected to the third resistor to clamp the potential of the third resistor.
[0009] Optionally, the charging signal module includes: a first diode, a second transistor, a fourth resistor, and a fifth resistor; the anode of the first diode is connected to the second and third resistors of the wake-up source detection module, the cathode of the first diode is connected to the collector of the second transistor, the emitter of the second transistor is connected to the charging interface to receive the charging signal, the emitter and base of the second transistor are respectively connected to the two ends of the fourth resistor, and the base of the second transistor is grounded through the fifth resistor and the second diode.
[0010] Optionally, the charging detection module includes: a fifth diode, a seventh resistor, an eighth resistor, a ninth resistor, and a third capacitor; the power output from the MCU, the seventh resistor, the eighth resistor, and the ninth resistor are connected to ground in sequence; the cathode of the fifth diode is connected to the cathode of the first diode of the charging signal module, and the anode of the fifth diode is connected to the seventh and eighth resistors; the two ends of the third capacitor are connected to the two ends of the ninth resistor; the eighth and ninth resistors are connected to the MCU to provide a charging detection signal to the MCU.
[0011] Optionally, the switch detection module includes: a sixth diode, a tenth resistor, and a fourth capacitor; the cathode of the sixth diode is grounded through a switch, and the anode of the sixth diode, the tenth resistor, and the fourth capacitor are connected to ground in sequence; the connection between the tenth resistor and the fourth capacitor is connected to the MCU to provide a switch detection signal to the MCU.
[0012] Optionally, the wake-up delay module includes: a seventh diode, a fifth capacitor, and an eleventh resistor; one end of the eleventh resistor is connected to the MCU to receive the wake-up delay signal from the MCU, and the other end is connected to the power enable module through the seventh diode to provide a second power wake-up signal to the power enable module; the anode of the seventh diode is also grounded through the fifth capacitor to reduce noise.
[0013] On the other hand, this utility model provides a battery management system, including: the above-mentioned wake-up circuit and a wake-up module; the wake-up circuit is connected to the wake-up module and is used to control the wake-up module to work or go into sleep mode; the wake-up module further includes: one or more battery management system functional modules.
[0014] This utility model has the following beneficial effects:
[0015] The wake-up circuit of this utility model includes a wake-up source detection module that detects charging signals, communication signals, and switch states. The wake-up source detection module generates a first power wake-up signal based on the charging signal, communication signal, or switch state, and controls the power enable module to generate a corresponding power enable signal to control the woken-up module to work or go into sleep mode, thus realizing wake-up from multiple wake-up sources. At the same time, the power enable signal controls the power supply of the woken-up module to work or go into sleep mode, and the woken-up module can be powered off during sleep mode, further reducing power consumption.
[0016] The MCU of the wake-up circuit of this invention generates a wake-up delay signal based on the charging detection signal, communication detection signal, switch detection signal and preset time, and can maintain the working state of the woken-up module by delaying the charging, communication and switch status.
[0017] The wake-up source detection module of this invention is powered by the positive terminal of the battery and uses a clamping diode connected to the positive terminal of the battery for clamping. This ensures that the wake-up circuit is in an open circuit state when no wake-up source is connected, i.e., when the charging signal, communication signal, and switch signal are invalid, thereby further reducing power consumption. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the battery management system provided in an embodiment of the present invention;
[0019] Figure 2 This is a circuit diagram of the wake-up circuit provided in an embodiment of the present invention.
[0020] Explanation of icon numbers:
[0021] 1. Wake-up circuit; 11. Charging signal module; 12. Communication signal module; 13. Switch signal module; 14. Wake-up source detection module; 15. Power enable module; 16. Charging detection module; 17. Switch detection module; 18. Wake-up delay module;
[0022] 2. Wake-up module; 21. Power supply circuit; 22. MCU. Detailed Implementation
[0023] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0024] Reference Figure 1-2 A wake-up circuit 1 includes: a charging signal module 11, a communication signal module 12, a switch signal module 13, a wake-up source detection module 14, and a power enable module 15;
[0025] The charging signal module 11 is connected to the charging interface and is used to receive the charging signal C- from the charging interface.
[0026] The communication signal module 12 is connected to the communication interface and is used to receive the communication signal 485_WakeUP from the communication interface.
[0027] The switch signal module 13 is connected to the switch J1 and is used to receive the switch status KEY_ON / OFF.
[0028] The wake-up source detection module 14 is connected to the charging signal module 11, the communication signal module 12 and the switch signal module 13, and is used to generate a first power wake-up signal according to the charging signal, the communication signal and the switch state.
[0029] The power enable module 15 is connected to the wake-up source detection module 14 and is used to generate a power enable signal DC-DC_PW according to the first power wake-up signal; the power enable signal DC-DC_PW is used to control the power supply of the woken-up module 2 to work or to go into sleep mode when powered off.
[0030] When at least one of the states of the charging signal, the communication signal, and the switch is valid, the states of the first power wake-up signal and the power enable signal are valid, and the woken-up module is powered on to work; otherwise, the states of the first power wake-up signal and the power enable signal are invalid, and the woken-up module is powered off and goes into hibernation.
[0031] The wake-up module 2 includes a power supply circuit 21 and an MCU 22. The power supply circuit 21 is connected to the power enable module 15 and the MCU 22. The power supply circuit 21 receives the power enable signal from the power enable module 15 and supplies power to or de-energizes the MCU 22 according to the power enable signal status. When the power enable signal DC-DC PW is valid, the power supply circuit 21 supplies power to the MCU 22; otherwise, the power supply circuit 21 stops supplying power to the MCU 22. The power supply circuit 21 is a DC-DC power supply circuit.
[0032] Furthermore, the wake-up circuit 1 also includes: a charging detection module 16, a switch detection module 17, and a wake-up delay module 18.
[0033] The charging detection module 16 is connected to the charging signal module 11 and the MCU 22, and is used to convert the charging signal C- received by the charging signal module 16 into a charging detection signal Charge_WakeUp;
[0034] The switch detection module 17 is connected to the switch J1 and the MCU 22, and is used to convert the switch state into a switch detection signal Soft_SW;
[0035] The MCU 22 is connected to the wake-up delay module 18. The MCU 22 is used to input the charging detection signal, the switch detection signal, and the communication detection signal 485_WakeUP, and generate a wake-up delay signal DC-DC_EN according to the charging detection signal, the switch detection signal, the communication detection signal, and a preset time, and output it to the wake-up delay module 18. The wake-up delay module 18 is used to generate a second power wake-up signal according to the state of the wake-up delay signal DC-DC_EN.
[0036] When the charging detection signal, communication detection signal, and switch detection signal are all invalid (i.e., the charging signal, communication signal, and switch state are all invalid), the MCU maintains the wake-up delay signal DC-DC_EN as valid for a preset time. When at least one of the charging detection signal, communication detection signal, and switch detection signal is valid, or when all three signals are invalid for more than a preset time, the wake-up delay signal DC-DC_EN is invalid. When the wake-up delay signal DC-DC_EN is valid, the second power wake-up signal is valid; otherwise, the second power wake-up signal is invalid.
[0037] The power enable module 15 is also connected to the wake-up delay module 18 and is used to generate a power enable signal DC-DC_PW according to the state of the second power wake-up signal. When at least one of the first power wake-up signal and the second power wake-up signal is valid, the power enable signal DC-DC_PW is valid.
[0038] Furthermore, the charging signal status, the communication signal status, and the switch status are all active low.
[0039] The wake-up source detection module 14 includes: a first resistor R1, a second resistor R2, a third resistor R3, a clamping diode D0, a first transistor Q1, an output resistor R0, and a first capacitor C1. The first resistor R1, second resistor R2, third resistor R3, and clamping diode D0 are connected sequentially. The emitter and base of the first transistor Q1 are connected to both ends of the first resistor R1, and the emitter of the first transistor Q1 is also connected to the positive terminal B+ of the battery to power the wake-up source detection circuit. The collector of the first transistor Q1 is connected to one end of the output resistor R0, and the other end of the output resistor R0 is connected to the power enable module 15 to output a first power wake-up signal to the power enable module 15. The cathode of the clamping diode D0 is connected to the positive terminal B+ of the battery, and the anode of the clamping diode D0 is connected to the third resistor R3 to limit the potential of the third resistor R3. The first capacitor C1 is a low-pass filter capacitor. The connection point between the second resistor R2 and the third resistor R3 is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded to filter out high-frequency noise. The first transistor Q1 is a PNP type transistor.
[0040] The charging signal module 11 includes: a first diode D1, a second transistor Q2, a second diode D2, a fourth resistor R4, and a fifth resistor R5; the anode of the first diode D1 is connected to the wake-up source detection module 14 to transmit the charging signal status. Specifically, the anode of the first diode D1 is connected to the junction of the second resistor R2 and the third resistor R3; the cathode of the first diode D1 is connected to the collector of the second transistor Q2; the emitter of the second transistor Q2 is connected to the charging interface to receive the charging signal; the emitter and base of the second transistor Q2 are respectively connected to the two ends of the fourth resistor R4; one end of the fifth resistor R5 is connected to the base of the second transistor Q2 and the fourth resistor R4, and the other end is connected to the cathode of the second diode D2; the anode of the second diode D2 is grounded. In use, when the charging signal C- is low, and the charging signal C- is valid, the first diode D1, the second transistor Q2, and the first transistor Q1 of the wake-up source detection module 14 are turned on. The first power wake-up signal provided by the output resistor R0 to the power enable module 15 is high, i.e., valid, thus making the power enable signal DC-DC_PW high, i.e. valid, and the power circuit 21 provides power to the MCU 22. Otherwise, the first power wake-up signal is invalid.
[0041] The communication signal module 12 includes a third diode D3; the cathode of the third diode D3 is connected to the communication interface to receive the communication signal 485_WakeUP, and the anode is connected to the junction of the second resistor R2 and the third resistor R2 of the wake-up source detection module 14. When the communication signal is low (i.e., valid), the third diode D3 is turned on, and the first power wake-up signal output by the wake-up source detection module 14 is high (i.e., valid); otherwise, it is invalid.
[0042] The switch signal module 13 includes a fourth diode D4; the anode of the fourth diode D4 is connected to the anode of the clamping diode D0 of the wake-up source detection module 14, and the cathode is connected to one end of the switch J1 to receive the switch status, and the other end of the switch J1 is grounded; when the switch J1 is closed, the switch is grounded, that is, the switch status is valid, the fourth diode D4 is grounded, and the first power wake-up signal output by the wake-up source detection module 14 is valid; otherwise, it is invalid.
[0043] The power enable module 15 includes a sixth resistor R6 and a second capacitor C2; one end of the sixth resistor R6 and the second capacitor C2 is grounded, and the other end is connected to the other end of the output resistor R0 and the power circuit 21, and provides a power enable signal DC-DC_PW to the power circuit 21; when the output resistor R0 outputs a first wake-up signal, the power enable signal DC-DC_PW is at a high level, that is, the power enable signal DC-DC_PW is valid.
[0044] The charging detection module 16 includes: a fifth diode D5, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a third capacitor C3; the power supply V33_MCU output from the MCU 22, the seventh resistor R7, the eighth resistor R8, and the ninth resistor R9 are connected to ground in sequence; the cathode of the fifth diode D5 is connected to the cathode of the first diode D1, and the anode is connected to the connection point of the seventh resistor R7 and the eighth resistor R8; the two ends of the third capacitor C3 are connected to the two ends of the ninth resistor R9. The connection point of the eighth resistor R8 and the ninth resistor R9 is connected to the MCU 22 and provides the MCU 22 with a charging detection signal Charge_WakeUP.
[0045] The switch detection module 17 includes: a sixth diode D6, a tenth resistor R10, and a fourth capacitor C4; the cathode of the sixth diode D6 is grounded through switch J1, and the anode of the sixth diode D6, the tenth resistor R10, and the fourth capacitor C4 are connected to ground in sequence; the connection between the tenth resistor R10 and the fourth capacitor C4 is connected to the MCU 22 and provides the MCU 22 with a switch detection signal Soft_SW.
[0046] The wake-up delay module 18 includes a seventh diode D7, a fifth capacitor C5, and an eleventh resistor R11. One end of the eleventh resistor R11 is connected to the MCU 22 to receive the wake-up delay signal DC-DC_EN provided by the MCU 22, and the other end is connected to the anode of the seventh diode D7. The cathode of the seventh diode D7 is connected to the power enable module 15 to provide a second power wake-up signal to the power enable module 15. The anode of the seventh diode D7 is also grounded through the fifth capacitor C5 to reduce noise. When the MCU 22 receives the charging detection signal Charge-WakeUP, the switch detection signal Soft_SW, and the communication detection signal 485_WakeUP, all of which are high (i.e., invalid), the MCU 22 controls the output of the wake-up delay signal DC-DC_EN to be high (i.e., valid) within a preset time. The second power wake-up signal is valid, and the power enable signal DC-DC_PW is high (i.e., valid). When at least one of the charging detection signal Charge-WakeUP, the switch detection signal Soft_SW, and the communication detection signal 485_WakeUP received by the MCU 22 is low, or when all three signals are high for more than a preset time, the wake-up delay signal DC-DC_EN becomes low (i.e., invalid).
[0047] A battery management system includes: the aforementioned wake-up circuit 1 and a wake-up module 2; the wake-up circuit 1 is connected to the wake-up module 2 and is used to control the wake-up module 2 to work or go into sleep mode; the wake-up module 2 further includes: one or more battery management system functional modules.
[0048] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0049] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A wake-up circuit, characterized in that, include: The module includes a charging signal module (11), a communication signal module (12), a switch signal module (13), a wake-up source detection module (14), and a power enable module (15). The charging signal module (11) is connected to the charging interface and is used to receive the charging signal from the charging interface; the communication signal module (12) is connected to the communication interface and is used to receive the communication signal from the communication interface. The switch signal module (13) is connected to the switch and is used to receive the switch status; The wake-up source detection module (14) is connected to the charging signal module (11), the communication signal module (12) and the switch signal module (13), and is used to generate a first power wake-up signal according to the charging signal, the communication signal and the switch state; The power enable module (15) is connected to the wake-up source detection module (14) and is used to generate a power enable signal according to the first power wake-up signal; the power enable signal is used to control the wake-up module (2) to be powered on for operation or to go into sleep mode when powered off.
2. The wake-up circuit according to claim 1, characterized in that, When at least one of the states of the charging signal, the communication signal, and the switch is valid, the states of the first power wake-up signal and the power enable signal are valid, and the woken-up module is powered on to work; otherwise, the states of the first power wake-up signal and the power enable signal are invalid, and the woken-up module (2) is powered off and goes into hibernation.
3. The wake-up circuit according to claim 1, characterized in that, The wake-up module (2) includes a power supply circuit (21) and an MCU (22); the power supply circuit (21) is connected to the power enable module (15) and the MCU (22), and the power supply circuit (21) is used to receive the power enable signal of the power enable module (15) and to supply or de-energize the MCU (22) according to the power enable signal status.
4. The wake-up circuit according to claim 3, characterized in that, The wake-up circuit further includes: a charging detection module (16), a switch detection module (17), and a wake-up delay module (18); the charging detection module (16) is connected to the charging signal module (11) and the MCU (22), and is used to convert the charging signal received by the charging signal module (11) into a charging detection signal; the switch detection module (17) is connected to the switch and the MCU (22), and is used to convert the switch state into a switch detection signal; the MCU (22) is connected to the wake-up delay module (18), and is used to generate a wake-up delay signal according to the input charging detection signal, switch detection signal, communication signal and preset time and output it to the wake-up delay module (18); the wake-up delay module (18) is used to generate a second power wake-up signal according to the state of the wake-up delay signal; the power enable module (15) is also connected to the wake-up delay module (18) and is used to generate a power enable signal according to the state of the second power wake-up signal.
5. The wake-up circuit according to claim 4, characterized in that, The wake-up source detection module (14) includes: a first resistor, a second resistor, a third resistor, a clamping diode, a first transistor, and an output resistor; the first resistor, the second resistor, the third resistor, and the clamping diode are connected in sequence, the emitter and base of the first transistor are respectively connected to the two ends of the first resistor, the emitter of the first transistor is also connected to the positive terminal of the battery to supply power to the wake-up source detection circuit, the collector of the first transistor is connected to the power enable module (15) through the output resistor to output a first power wake-up signal to the power enable module (15); the cathode of the clamping diode is connected to the positive terminal of the battery, and the anode of the clamping diode is connected to the third resistor to clamp the potential of the third resistor.
6. The wake-up circuit according to claim 5, characterized in that, The charging signal module (11) includes: a first diode, a second transistor, a fourth resistor, and a fifth resistor; the anode of the first diode is connected to the second and third resistors of the wake-up source detection module (14), the cathode of the first diode is connected to the collector of the second transistor, the emitter of the second transistor is connected to the charging interface to receive the charging signal, the emitter and base of the second transistor are respectively connected to the two ends of the fourth resistor, and the base of the second transistor is grounded through the fifth resistor and the second diode.
7. The wake-up circuit according to claim 6, characterized in that, The charging detection module (16) includes: a fifth diode, a seventh resistor, an eighth resistor, a ninth resistor, and a third capacitor; the power supply output by the MCU (22), the seventh resistor, the eighth resistor, and the ninth resistor are connected to ground in sequence; the cathode of the fifth diode is connected to the cathode of the first diode of the charging signal module (11), and the anode of the fifth diode is connected to the seventh resistor and the eighth resistor; the two ends of the third capacitor are connected to the two ends of the ninth resistor; the eighth resistor and the ninth resistor are connected to the MCU (22) to provide a charging detection signal to the MCU (22).
8. The wake-up circuit according to claim 4, characterized in that, The switch detection module (17) includes: a sixth diode, a tenth resistor, and a fourth capacitor; the cathode of the sixth diode is grounded through a switch, and the anode of the sixth diode, the tenth resistor, and the fourth capacitor are connected to ground in sequence; the connection between the tenth resistor and the fourth capacitor is connected to the MCU (22) to provide a switch detection signal to the MCU (22).
9. The wake-up circuit according to claim 4, characterized in that, The wake-up delay module (18) includes a seventh diode, a fifth capacitor, and an eleventh resistor; one end of the eleventh resistor is connected to the MCU (22) to receive the wake-up delay signal from the MCU (22), and the other end is connected to the power enable module (15) through the seventh diode to provide a second power wake-up signal to the power enable module (15). The anode of the seventh diode is also grounded through the fifth capacitor to reduce noise.
10. A battery management system, characterized in that, include: The wake-up circuit (1) and the woken-up module (2) as described in any one of claims 3-9; the wake-up circuit (1) is connected to the woken-up module (2) and is used to control the woken-up module (2) to work or go into sleep mode; The woke-up module (2) also includes one or more battery management system function modules.