Battery charging identification activation multiplexing circuit and battery management system
By reusing the input of the charging identification comparator, the battery charging identification and activation functions are realized, which solves the problem of increased interface number in traditional battery management systems, achieves space saving and cost reduction, and improves the stability of the battery charging identification and activation multiplexing circuit.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANG DONG GREENWAY TECH CO LTD
- Filing Date
- 2025-03-18
- Publication Date
- 2026-04-21
AI Technical Summary
Traditional battery management systems add extra pins to implement charging identification signals and battery activation detection functions, which increases the number of external interfaces of the battery, making it difficult to implement under physical space constraints and increasing manufacturing costs.
The system employs a charging identification comparator and a battery activation module, including a charging identification comparator, a battery activation unit, and a freewheeling diode. By reusing the input of the charging identification comparator, the charging identification and activation functions are realized, reducing the need for additional ports.
It saves space, reduces production costs, and improves the stability of the battery charging recognition activation multiplexing circuit in the static state, avoiding false triggering.
Smart Images
Figure CN224153978U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the technical field of battery management, and in particular to a battery charging identification activation multiplexing circuit and a battery management system. Background Technology
[0002] As the global emphasis on green energy continues to increase, battery management systems are also constantly being updated and upgraded. The requirements for battery management systems are also gradually increasing, which necessitates that the design of battery management systems must have accurate charging identification and battery activation functions to meet more diverse application scenarios.
[0003] However, in traditional technical solutions, battery management systems typically add extra pins to achieve both charging identification signal input and battery activation detection, resulting in a surge in the number of external interfaces for the battery. This may also be difficult to implement due to physical space limitations, thereby increasing manufacturing costs. Utility Model Content
[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a battery charging identification activation multiplexing circuit and a battery management system.
[0005] The purpose of this disclosure is achieved through the following technical solution:
[0006] A battery charging identification and activation multiplexing circuit includes a charging identification comparator and a battery activation module, wherein the battery activation module includes a battery activation unit and a freewheeling diode.
[0007] The first comparison input terminal of the charging identification comparator is used to connect to the reference power supply, the second comparison input terminal of the charging identification comparator is used to receive the charging access voltage, and the output terminal of the charging identification comparator is used to output the charging identification voltage.
[0008] The power supply terminal of the battery activation unit is connected to the first comparison input terminal of the charging identification comparator, the control terminal of the battery activation unit is connected to the positive terminal of the freewheeling diode, the negative terminal of the freewheeling diode is connected to the second comparison input terminal of the charging identification comparator, and the output terminal of the battery activation unit is used to output the battery activation voltage.
[0009] In one embodiment, the battery charging identification activation multiplexing circuit further includes a first electronic switch, the first terminal of which is connected to the charging identification voltage, the first terminal of which is also used to connect to an external power supply terminal, the control terminal of which is connected to the output terminal of the charging identification comparator, and the second terminal of which is grounded.
[0010] In one embodiment, the battery charging identification activation multiplexing circuit further includes a first bias resistor, the first end of which is connected to the control terminal of the first electronic switch, and the second end of which is grounded.
[0011] In one embodiment, the battery charging identification activation multiplexing circuit further includes a first voltage divider resistor, the first end of which is connected to an external power supply terminal, and the second end of which is connected to the first end of the first electronic switch.
[0012] In one embodiment, the first comparison input of the charging identification comparator is an inverting input, and the battery charging identification activation multiplexing circuit further includes an inverting input current limiting resistor. The first end of the inverting input current limiting resistor is used to connect to a reference power supply, and the second end of the inverting input current limiting resistor is connected to the inverting input.
[0013] In one embodiment, the second comparison input terminal of the charging identification comparator is a non-inverting input terminal, and the battery charging identification activation multiplexing circuit further includes a Zener diode and a filter capacitor. The negative terminal of the Zener diode and one end of the filter capacitor are respectively connected to the non-inverting input terminal, and the positive terminal of the Zener diode and the other end of the filter capacitor are respectively grounded.
[0014] In one embodiment, the battery activation unit includes a battery activation switch and a second bias resistor. The first end of the battery activation switch is connected to the first comparison input of the charging identification comparator. The control end of the battery activation switch is connected to the positive terminal of the freewheeling diode. The second end of the battery activation switch is connected to the first end of the second bias resistor. The first end of the second bias resistor is also used to connect to the battery activation voltage signal terminal. The second end of the second bias resistor is grounded.
[0015] In one embodiment, the battery activation switch includes a second electronic switch and a third electronic switch. The first terminal of the second electronic switch is connected to the first comparison input terminal of the charging identification comparator. The control terminal of the second electronic switch is connected to the positive terminal of the freewheeling diode. The second terminal of the second electronic switch and the control terminal of the third electronic switch are respectively connected to the first terminal of the second bias resistor. The first terminal of the third electronic switch is used to connect to the battery activation voltage signal terminal. The second terminal of the third electronic switch and the second terminal of the second bias resistor are respectively connected to the ground terminal.
[0016] In one embodiment, the battery activation unit further includes a second voltage divider resistor, the first end of which is connected to the second end of the second electronic switch, and the second end of which is connected to the control terminal of the third electronic switch.
[0017] This application also provides a battery management system, including the battery charging identification activation multiplexing circuit described in any embodiment.
[0018] Compared with the prior art, this disclosure has at least the following advantages:
[0019] 1. The battery charging identification and activation multiplexing circuit described above realizes both battery charging identification and activation functions by multiplexing the first comparison input terminal and the second comparison input terminal of the charging identification comparator, reducing the need for additional ports, thereby saving space and reducing production costs.
[0020] 2. In addition, when the battery charging identification activation multiplexing circuit is in a static state, the current flowing into the charging identification comparator approaches zero due to the high input impedance characteristic of the charging identification comparator. This prevents the second comparison input terminal of the charging identification comparator from being mistakenly pulled to a low level due to leakage current, ensuring that the battery activation unit will not be falsely triggered in the non-charging state, thereby improving the stability of the battery charging identification activation multiplexing circuit. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 A circuit diagram of a battery charging identification activation multiplexing circuit according to one embodiment;
[0023] Figure 2 for Figure 1 The circuit diagram of the charging identification comparator shown is shown below;
[0024] Figure 3 for Figure 1 The circuit diagram of the battery activation module is shown.
[0025] Figure reference numerals: 10 - Battery charging identification and activation multiplexing circuit; 100 - Battery activation module; CC5 - Filter capacitor; Charger_IN - Charging input voltage; CHGER_OK - Charging identification voltage; DZC5 - Zener diode; DK1 - Freewheeling diode; IN - First comparator input; IN+ - Second comparator input; MC5 - First electronic switch; QK4 - Second electronic switch; QK6 - Third electronic switch; RC27 - Inverting input current limiting resistor; RC5 - First voltage divider resistor; RC6 - First bias resistor; RK27 - Second voltage divider resistor; RK28 - Second bias resistor; SW_ATV - Battery activation voltage; UC1 - Charging identification comparator; VCC_RTC - Reference power supply. Detailed Implementation
[0026] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.
[0027] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0029] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:
[0030] like Figures 1 to 3 As shown, a battery charging identification activation multiplexing circuit 10 according to an embodiment of the present disclosure includes a charging identification comparator UC1 and a battery activation module 100. The battery activation module 100 includes a battery activation unit and a freewheeling diode DK1.
[0031] The first comparison input terminal IN- of the charging identification comparator UC1 is used to connect to the reference power supply VCC_RTC, the second comparison input terminal IN+ of the charging identification comparator UC1 is used to receive the charging access voltage Charger_IN, and the output terminal of the charging identification comparator UC1 is used to output the charging identification voltage CHGER_OK.
[0032] The power supply terminal of the battery activation unit is connected to the first comparison input terminal IN- of the charging identification comparator UC1, the control terminal of the battery activation unit is connected to the positive terminal of the freewheeling diode DK1, the negative terminal of the freewheeling diode DK1 is connected to the second comparison input terminal IN+ of the charging identification comparator UC1, and the output terminal of the battery activation unit is used to output the battery activation voltage SW_ATV.
[0033] In this embodiment, when the charger is connected to the battery charging identification activation multiplexing circuit 10, the charging access voltage Charger_IN provided by the charger is transmitted to the second comparison input terminal IN+ of the charging identification comparator UC1. Simultaneously, the reference power supply VCC_RTC transmits a reference voltage to the first comparison input terminal IN- of the charging identification comparator UC1 and compares it with the input voltage of the second comparison input terminal IN+. When the input voltage of the second comparison input terminal IN+ is greater than the reference voltage of the first comparison input terminal IN-, the charging identification comparator UC1 outputs a charging identification voltage CHGER_OK. Then, the microcontroller determines whether the battery charging identification activation multiplexing circuit 10 has been connected to the charger by recognizing the change in the charging identification voltage CHGER_OK, and controls the on / off state of the charging transistor in the circuit, thereby controlling the battery charging state. At this time, if the battery is charging, the second comparison input terminal IN+ of the charging identification comparator UC1 is in a high-level state. Since the control terminal of the battery activation unit is connected to the positive terminal of the freewheeling diode DK1, and the negative terminal of the freewheeling diode DK1 is connected to the second comparison input terminal IN+ of the charging identification comparator UC1, the freewheeling diode DK1 is in a reverse cutoff state. The voltage at the control terminal of the battery activation unit has not reached its conduction threshold voltage, thereby making the battery activation unit in a cutoff state, thus preventing the output terminal of the battery activation unit from being falsely triggered and outputting the battery activation voltage SW_ATV.
[0034] Furthermore, when the battery charging identification activation multiplexing circuit 10 is in the idle mode, the voltage of the second comparison input terminal IN+ of the charging identification comparator UC1 is relatively stable and unchanged. Moreover, the charging identification comparator UC1 has a high input impedance characteristic, which makes the charging identification comparator UC1 in a "virtual off" state. Even if a weak current flows through the second comparison input terminal IN+ of the charging identification comparator UC1, it will not have a significant impact on the charging access voltage Charger_IN. This ensures that in the idle state, the second comparison input terminal IN+ of the charging identification comparator UC1 will not be erroneously pulled to a low level due to leakage current.
[0035] Furthermore, when the battery needs to be activated, the second comparison input terminal IN+ of the charging identification comparator UC1 can be pulled low by an external device, making the power supply voltage of the battery activation unit greater than its control voltage. At the same time, the reference voltage provided by the reference power supply VCC_RTC is greater than the charging access voltage Charger_IN provided by the charger. That is, the voltage of the first comparison input terminal IN- of the charging identification comparator UC1 is greater than the voltage of its second comparison input terminal IN+. The control voltage of the battery activation unit forms a loop with the second comparison input terminal IN+ of the charging identification comparator UC1 through the freewheeling diode DK1, thereby raising the control voltage of the battery activation unit to its conduction threshold voltage, so that it is in the conduction state. Then, the output terminal of the battery activation unit is used to output the battery activation voltage SW_ATV signal. After the microcontroller detects the change in the battery activation voltage SW_ATV signal, it determines that the battery has entered the activation state and controls the battery to enter the working state.
[0036] The aforementioned battery charging identification and activation multiplexing circuit 10 achieves both battery charging identification and activation functions by multiplexing the first comparison input terminal IN- and the second comparison input terminal IN+ of the charging identification comparator UC1. This reduces the need for additional ports, thereby saving space and lowering production costs. Furthermore, in the idle state, the high input impedance of the charging identification comparator UC1 ensures that the current flowing into it approaches zero. This prevents the second comparison input terminal IN+ of UC1 from being incorrectly pulled low due to leakage current, ensuring that the battery activation unit is not falsely triggered in the non-charging state, thus improving the stability of the battery charging identification and activation multiplexing circuit 10.
[0037] like Figures 1 to 3As shown, in one embodiment, the battery charging identification activation multiplexing circuit 10 further includes a first electronic switch MC5. The first terminal of the first electronic switch MC5 is connected to the charging identification voltage CHGER_OK, and the first terminal of the first electronic switch MC5 is also used to connect to an external power supply. The control terminal of the first electronic switch MC5 is connected to the output terminal of the charging identification comparator UC1, and the second terminal of the first electronic switch MC5 is grounded. In this embodiment, when the charger is connected, the voltage at the second comparison input terminal IN+ of the charging identification comparator UC1 is higher than that at the first comparison input terminal IN-. The charging identification comparator UC1 outputs a high-level signal to the control terminal of the first electronic switch MC5. The first electronic switch MC5 is turned on under the high-level drive of the control terminal, pulling the charging identification voltage CHGER_OK to a low level. Then, the microcontroller determines that the charger is connected by detecting the low-level state of the charging identification voltage CHGER_OK and immediately turns on the charging tube to charge the battery. When no charger is connected, the charging identification comparator UC1 outputs a low-level signal, and the first electronic switch MC5 is in the off state. The first electronic switch MC5 cuts off the connection between the charging identification voltage CHGER_OK and the ground terminal, preventing the charging identification voltage CHGER_OK from being incorrectly pulled down due to the leakage current of the first electronic switch MC5, thereby ensuring the microcontroller's accurate identification of the static state.
[0038] In another embodiment, the first electronic switch MC5 is an N-channel MOS transistor, the first terminal of the first electronic switch MC5 is the drain of the N-channel MOS transistor, the second terminal of the first electronic switch MC5 is the source of the N-channel MOS transistor, and the control terminal of the first electronic switch MC5 is the gate of the N-channel MOS transistor.
[0039] like Figures 1 to 3 As shown, in one embodiment, the battery charging identification activation multiplexing circuit 10 further includes a first bias resistor RC6. The first end of the first bias resistor RC6 is connected to the control terminal of the first electronic switch MC5, and the second end of the first bias resistor RC6 is grounded. In this embodiment, when the charger is connected to the battery charging identification activation multiplexing circuit 10, the first electronic switch MC5 is turned on under the high-level drive of the control terminal, pulling the charging identification voltage CHGER_OK to a low level. The microcontroller detects the low-level state and immediately turns on the charging transistor to start the charging process. When the charger is not connected to the battery charging identification activation multiplexing circuit 10, the charging identification comparator UC1 outputs a low-level signal. Since the first bias resistor RC6 is connected between the control terminal and the ground terminal of the first electronic switch MC5, it ensures that the control terminal voltage of the first electronic switch MC5 can be reliably maintained at a low level, thereby keeping the first electronic switch MC5 in a cutoff state.
[0040] like Figures 1 to 3As shown, in one embodiment, the battery charging identification activation multiplexing circuit 10 further includes a first voltage divider resistor RC5. The first end of the first voltage divider resistor RC5 is connected to the external power supply terminal, and the second end of the first voltage divider resistor RC5 is connected to the first end of the first electronic switch MC5. In this embodiment, when the charger is connected, the charging identification comparator UC1 outputs a high-level signal to the control terminal of the first electronic switch MC5, causing the first electronic switch MC5 to conduct. At this time, the external power supply forms a loop with the conducting first electronic switch MC5 through the first voltage divider resistor RC5, thereby pulling the charging identification voltage CHGER_OK to a low level. At this time, the first voltage divider resistor RC5 acts as a current limiter to prevent damage to the first electronic switch MC5 due to excessive current when it is turned on. Simultaneously, through the voltage division effect, it ensures that the charging identification voltage CHGER_OK can be accurately identified as low by the microcontroller.
[0041] like Figures 1 to 3 As shown, in one embodiment, the first comparison input terminal IN- of the charging identification comparator UC1 is an inverting input terminal. The battery charging identification activation multiplexing circuit 10 also includes an inverting input current-limiting resistor RC27. The first terminal of the inverting input current-limiting resistor RC27 is connected to the reference power supply VCC_RTC, and the second terminal of the inverting input current-limiting resistor RC27 is connected to the inverting input terminal. In this embodiment, when the charger is connected, the reference voltage output by the reference power supply VCC_RTC is transmitted to the inverting input terminal of the comparator through the inverting input current-limiting resistor RC27. At this time, the inverting input current-limiting resistor RC27 limits the current flowing into the input terminal of the comparator, preventing damage to the charging identification comparator UC1 due to excessive input current caused by voltage fluctuations or external interference. At the same time, the inverting input current-limiting resistor RC27 helps to reduce the impact of current fluctuations caused by power supply fluctuations or external interference on the input terminal of the charging identification comparator UC1, thereby improving the stability of the battery charging identification activation multiplexing circuit 10.
[0042] like Figures 1 to 3As shown, in one embodiment, the second comparison input terminal IN+ of the charging identification comparator UC1 is the non-inverting input terminal. The battery charging identification activation multiplexing circuit 10 also includes a Zener diode DZC5 and a filter capacitor CC5. The negative terminal of the Zener diode DZC5 and one end of the filter capacitor CC5 are respectively connected to the non-inverting input terminal, and the positive terminal of the Zener diode DZC5 and the other end of the filter capacitor CC5 are respectively grounded. In this embodiment, when the charger is connected, if the voltage at the non-inverting input terminal exceeds the breakdown voltage of the Zener diode DZC5, the Zener diode DZC5 will conduct and discharge the excess voltage to the ground terminal, thereby ensuring that the voltage at the non-inverting input terminal does not exceed the set safety threshold. In addition, since the external power supply may contain high-frequency noise interference, the interference component is superimposed on the charging access voltage Charger_IN, which can easily cause the voltage signal to fluctuate rapidly. At this time, the filter capacitor CC5 can absorb high-frequency noise interference through its charging and discharging characteristics, making the voltage signal at the non-inverting input terminal smoother and more stable, thereby enabling the charging identification comparator UC1 to work normally and stably, and thus improving the reliability of the charging identification comparator UC1.
[0043] like Figures 1 to 3As shown, in one embodiment, the battery activation unit includes a battery activation switch and a second bias resistor RK28. The first terminal of the battery activation switch is connected to the first comparison input terminal IN- of the charging identification comparator UC1, and the control terminal of the battery activation switch is connected to the positive terminal of the freewheeling diode DK1. The second terminal of the battery activation switch is connected to the first terminal of the second bias resistor RK28. The first terminal of the second bias resistor RK28 is also used to connect to the battery activation voltage SW_ATV signal terminal, and the second terminal of the second bias resistor RK28 is grounded. In this embodiment, when the charging access voltage Charger_IN is pulled low, the second comparison input terminal IN+ of the charging identification comparator UC1 is also pulled low. At this time, the voltage at the first comparison input terminal IN- of the charging identification comparator UC1, which is connected to the reference power supply VCC_RTC, is greater than that at its second comparison input terminal IN+, causing the freewheeling diode DK1 to conduct. This allows the control terminal of the battery activation switch to obtain voltage and drives the battery activation switch to conduct, thereby causing the second terminal of the battery activation switch to output a voltage signal to the second bias resistor RK28. Since the first terminal of the second bias resistor RK28 is also used to connect to the battery activation voltage SW_ATV signal terminal, and its second terminal is grounded, and the output voltage of the second terminal of the battery activation switch forms a loop with the ground terminal through the second bias resistor RK28, the battery activation voltage SW_ATV signal terminal is pulled to a low level through the second bias resistor RK28, thereby enabling the microcontroller to recognize the voltage change of the battery activation voltage SW_ATV signal terminal to drive the battery into the activation state; on the other hand, when the battery does not need to be activated, the battery activation switch is in the off state, and the second terminal of the second bias resistor RK28 is grounded, thereby forming a loop between the battery activation voltage SW_ATV signal terminal and the ground terminal and keeping it at a low level to ensure that the microcontroller does not misjudge the battery activation state.
[0044] like Figures 1 to 3As shown, in one embodiment, the battery activation switch includes a second electronic switch QK4 and a third electronic switch QK6. The first terminal of the second electronic switch QK4 is connected to the first comparison input terminal IN- of the charging identification comparator UC1. The control terminal of the second electronic switch QK4 is connected to the positive terminal of the freewheeling diode DK1. The second terminals of the second electronic switch QK4 and the control terminals of the third electronic switch QK6 are respectively connected to the first terminal of the second bias resistor RK28. The first terminal of the third electronic switch QK6 is used to connect to the battery activation voltage SW_ATV signal terminal. The second terminal of the third electronic switch QK6 and the second terminal of the second bias resistor RK28 are respectively connected to the ground terminal. In this embodiment, the first terminal of the second electronic switch QK4 is connected to the first comparison input terminal IN- of the charging identification comparator UC1. The control terminal of the second electronic switch QK4 is connected to the positive terminal of the freewheeling diode DK1. When the battery needs to be activated, the second comparison input terminal IN+ of the charging identification comparator UC1 is pulled to a low level by an external device, making the voltage of the first comparison input terminal IN- greater than the voltage of the second comparison input terminal IN+. At this time, the freewheeling diode DK1 conducts due to the voltage difference between its two ends, providing sufficient voltage to the control terminal of the second electronic switch QK4 to drive the second electronic switch QK4 into the conducting state. After the second electronic switch QK4 is turned on, its second terminal outputs a high-level signal, which is simultaneously connected to the control terminal of the third electronic switch QK6 and the first terminal of the second bias resistor RK28. Upon receiving a high-level control signal, the third electronic switch QK6 also conducts, causing the battery activation voltage SW_ATV signal terminal, connected to its first terminal, to form a path with the ground terminal through the second terminal of QK6. This pulls down the voltage of the battery activation voltage SW_ATV signal terminal, creating a low-level signal that can be recognized by the microcontroller. Finally, after detecting the low-level change of the battery activation voltage SW_ATV signal terminal, the microcontroller determines that the battery has entered the activation state and subsequently controls the battery to enter the working state.
[0045] In another embodiment, the second electronic switch QK4 is a PNP transistor, with its first terminal being the emitter and its second terminal being the collector, and its control terminal being the base. The third electronic switch QK6 is an NPN transistor, with its first terminal being the collector, its second terminal being the emitter, and its control terminal being the base.
[0046] like Figures 1 to 3As shown, in one embodiment, the battery activation unit further includes a second voltage divider resistor RK27. The first terminal of the second voltage divider resistor RK27 is connected to the second terminal of the second electronic switch QK4, and the second terminal of the second voltage divider resistor RK27 is connected to the control terminal of the third electronic switch QK6. In this embodiment, when battery activation is required, the second electronic switch QK4 is turned on, and its second terminal outputs a high-level signal. This signal is transmitted to the control terminal of the third electronic switch QK6 through the second voltage divider resistor RK27. At this time, the second voltage divider resistor RK27 appropriately divides the high-level signal output by the second electronic switch QK4 to ensure that the control terminal voltage of the third electronic switch QK6 is within its conduction threshold range, and to prevent the third electronic switch QK6 from being damaged due to excessively high control terminal voltage. Simultaneously, it ensures reliable conduction, thereby improving the reliability and stability of the battery charging identification activation multiplexing circuit 10.
[0047] This application also provides a battery management system, including a battery charging identification activation multiplexing circuit 10 according to any embodiment. In this embodiment, when a charger is connected to the battery charging identification activation multiplexing circuit 10, the charging access voltage Charger_IN provided by the charger is transmitted to the second comparison input terminal IN+ of the charging identification comparator UC1; simultaneously, the reference power supply VCC_RTC transmits a reference voltage to the first comparison input terminal IN- of the charging identification comparator UC1 and compares it with the input voltage of the second comparison input terminal IN+. When the input voltage of the second comparison input terminal IN+ is greater than the reference voltage of the first comparison input terminal IN-, the charging identification comparator UC1 outputs a charging identification voltage CHGER_OK. Then, the microcontroller determines whether the battery charging identification activation multiplexing circuit 10 has been connected to the charger by recognizing the change in the charging identification voltage CHGER_OK, and controls the on / off state of the charging tube in the circuit, thereby controlling the battery charging state. At this time, if the battery is charging, the second comparison input terminal IN+ of the charging identification comparator UC1 is in a high-level state. Since the control terminal of the battery activation unit is connected to the positive terminal of the freewheeling diode DK1, and the negative terminal of the freewheeling diode DK1 is connected to the second comparison input terminal IN+ of the charging identification comparator UC1, the freewheeling diode DK1 is in a reverse cutoff state. The voltage at the control terminal of the battery activation unit has not reached its conduction threshold voltage, thereby making the battery activation unit in a cutoff state, thus preventing the output terminal of the battery activation unit from being falsely triggered and outputting the battery activation voltage SW_ATV. Furthermore, when the battery charging identification activation multiplexing circuit 10 is in the idle mode, the voltage of the second comparison input terminal IN+ of the charging identification comparator UC1 is relatively stable and unchanged. Moreover, the charging identification comparator UC1 has a high input impedance characteristic, which makes the charging identification comparator UC1 in a "virtual off" state. Even if a weak current flows through the second comparison input terminal IN+ of the charging identification comparator UC1, it will not have a significant impact on the charging access voltage Charger_IN. This ensures that in the idle state, the second comparison input terminal IN+ of the charging identification comparator UC1 will not be erroneously pulled to a low level due to leakage current.Furthermore, when the battery needs to be activated, the second comparison input terminal IN+ of the charging identification comparator UC1 can be pulled low by an external device, making the power supply voltage of the battery activation unit greater than its control voltage. At the same time, the reference voltage provided by the reference power supply VCC_RTC is greater than the charging access voltage Charger_IN provided by the charger. That is, the voltage of the first comparison input terminal IN- of the charging identification comparator UC1 is greater than the voltage of its second comparison input terminal IN+. The control voltage of the battery activation unit forms a loop with the second comparison input terminal IN+ of the charging identification comparator UC1 through the freewheeling diode DK1, thereby raising the control voltage of the battery activation unit to its conduction threshold voltage, so that it is in the conduction state. Then, the output terminal of the battery activation unit is used to output the battery activation voltage SW_ATV signal. After the microcontroller detects the change in the battery activation voltage SW_ATV signal, it determines that the battery has entered the activation state and controls the battery to enter the working state.
[0048] Compared with the prior art, this disclosure has at least the following advantages:
[0049] 1. The battery charging identification and activation multiplexing circuit 10 described above realizes both battery charging identification and activation functions by multiplexing the first comparison input terminal IN- and the second comparison input terminal IN+ of the charging identification comparator UC1, reducing the need for additional ports, thereby saving space and reducing production costs.
[0050] 2. In addition, when the battery charging identification activation multiplexing circuit 10 is in a static state, the current flowing into the charging identification comparator UC1 approaches zero due to the high input impedance characteristic of the charging identification comparator UC1. This prevents the second comparison input terminal IN+ of the charging identification comparator UC1 from being mistakenly pulled to a low level due to leakage current. In other words, it ensures that the battery activation unit will not be falsely triggered in the non-charging state, thereby improving the stability of the battery charging identification activation multiplexing circuit 10.
[0051] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.
Claims
1. A battery charging identification activation multiplexing circuit, characterized in that, It includes a charging identification comparator and a battery activation module, wherein the battery activation module includes a battery activation unit and a freewheeling diode; The first comparison input terminal of the charging identification comparator is used to connect to the reference power supply, the second comparison input terminal of the charging identification comparator is used to receive the charging access voltage, and the output terminal of the charging identification comparator is used to output the charging identification voltage. The power supply terminal of the battery activation unit is connected to the first comparison input terminal of the charging identification comparator, the control terminal of the battery activation unit is connected to the positive terminal of the freewheeling diode, the negative terminal of the freewheeling diode is connected to the second comparison input terminal of the charging identification comparator, and the output terminal of the battery activation unit is used to output the battery activation voltage.
2. The battery charge identification activation multiplexing circuit of claim 1, wherein, The battery charging identification activation multiplexing circuit also includes a first electronic switch tube. The first terminal of the first electronic switch tube is connected to the charging identification voltage. The first terminal of the first electronic switch tube is also used to connect to the external power supply terminal. The control terminal of the first electronic switch tube is connected to the output terminal of the charging identification comparator. The second terminal of the first electronic switch tube is grounded.
3. The battery charge identification activation multiplexing circuit of claim 2, wherein, The battery charging identification activation multiplexing circuit further includes a first bias resistor, the first end of which is connected to the control terminal of the first electronic switch, and the second end of which is grounded.
4. The battery charge identification activation multiplexing circuit of claim 2, wherein, The battery charging identification activation multiplexing circuit further includes a first voltage divider resistor, the first end of which is connected to an external power supply terminal, and the second end of which is connected to the first end of the first electronic switch.
5. The battery charge identification activation multiplexing circuit of claim 1, wherein, The first comparison input terminal of the charging identification comparator is an inverting input terminal. The battery charging identification activation multiplexing circuit also includes an inverting input current limiting resistor. The first terminal of the inverting input current limiting resistor is used to connect to the reference power supply, and the second terminal of the inverting input current limiting resistor is connected to the inverting input terminal.
6. The battery charge identification activation multiplexing circuit of claim 1, wherein, The second comparison input terminal of the charging identification comparator is a non-inverting input terminal. The battery charging identification activation multiplexing circuit also includes a Zener diode and a filter capacitor. The negative terminal of the Zener diode and one end of the filter capacitor are respectively connected to the non-inverting input terminal, and the positive terminal of the Zener diode and the other end of the filter capacitor are respectively grounded.
7. The battery charge identification activation multiplexing circuit of claim 1, wherein, The battery activation unit includes a battery activation switch and a second bias resistor. The first end of the battery activation switch is connected to the first comparison input terminal of the charging identification comparator. The second end of the battery activation switch is connected to the positive terminal of the freewheeling diode. The control terminal of the battery activation switch is connected to the first end of the second bias resistor. The first end of the second bias resistor is also used to connect to the battery activation voltage signal terminal. The second end of the second bias resistor is grounded.
8. The battery charging identification activation multiplexing circuit according to claim 7, characterized in that, The battery activation switch includes a second electronic switch and a third electronic switch. The first terminal of the second electronic switch is connected to the first comparison input terminal of the charging identification comparator. The control terminal of the second electronic switch is connected to the positive terminal of the freewheeling diode. The second terminal of the second electronic switch and the control terminal of the third electronic switch are respectively connected to the first terminal of the second bias resistor. The first terminal of the third electronic switch is used to connect to the battery activation voltage signal terminal. The second terminal of the third electronic switch and the second terminal of the second bias resistor are respectively connected to the ground terminal.
9. The battery charge identification activation multiplexing circuit of claim 8, wherein, The battery activation unit further includes a second voltage divider resistor, the first end of which is connected to the second end of the second electronic switch, and the second end of which is connected to the control terminal of the third electronic switch.
10. A battery management system, characterized by, Includes the battery charging identification activation multiplexing circuit as described in any one of claims 1 to 9.