Charging wake-up circuit, battery management system, and vehicle

Abstract

The embodiment of the application discloses a charging wake-up circuit, a battery management system and a vehicle, and relates to the technical field of power electronics, and comprises the following steps: an upper pull resistor is arranged between a wake-up detection end and a wake-up power supply, a lower pull resistor is arranged between the wake-up detection end and a reference ground end, a first control module is configured to output a control signal according to an input voltage of the wake-up detection end, a voltage regulating module is caused to lift a voltage between the wake-up detection end and the lower pull resistor under the action of the control signal, and a second control module is configured to output a wake-up signal for a battery management module according to the lifted voltage. Therefore, when an external charging device is not connected, the voltage regulating module does not act, the wake-up detection end only maintains a default upper pull state, the power consumption of a detection loop is low, and even if the vehicle is parked for a long time, the wake-up power supply is not prone to power loss.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to a charging wake-up circuit, a battery management system, and a vehicle. Background Technology

[0002] With the rapid development of vehicle technology, vehicles need to be compatible with various charging pile standards, such as Chinese national standards, European standards, and American standards, in order to achieve connection detection and charging system wake-up after the charging gun is inserted. Among them, the American charging standard requires that the vehicle-side charging interface should also be equipped with a pull-down resistor when the charging connector is not connected, and to ensure the accuracy of the plug detection, the resistance value of the corresponding pull-up resistor of the vehicle-side charging interface cannot be set too high.

[0003] In related technologies, vehicles are equipped with a dedicated detection circuit to determine the charging connector's connection status. Even when the vehicle enters sleep standby mode, the pull-up resistor in the dedicated detection circuit continues to supply power. A continuous DC circuit is formed between the pull-up and pull-down resistors, resulting in uninterrupted power loss, which can easily lead to insufficient power for the wake-up battery, especially for vehicles that have been parked for a long time. Summary of the Invention

[0004] In view of this, one of the objectives of this application is to provide a charging wake-up circuit, a battery management system, and a vehicle that can reduce the static current when the vehicle is parked, thereby avoiding power depletion during wake-up, while meeting the US standard charging requirements for pull-down resistor configuration.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: In a first aspect, embodiments of this application provide a charging wake-up circuit, which includes: Pull-up resistor, the pull-up resistor is connected between the wake-up detection terminal and the wake-up power supply, the wake-up detection terminal is used to connect to the external charging device; Pull-down resistor, the pull-down resistor is connected between the wake-up detection terminal and the reference ground terminal; The first control module has its input terminal connected to the wake-up detection terminal. The first control module is used to output a control signal according to the input voltage of its input terminal. The voltage regulation module is connected between the wake-up detection terminal, the wake-up power supply and the output terminal of the first control module. The voltage regulation module is used to raise the voltage between the wake-up detection terminal and the pull-down resistor according to the control signal output by the first control module. The second control module has its input connected between the wake-up detection terminal and the pull-down resistor. The second control module is used to output a wake-up signal based on the voltage between the wake-up detection terminal and the pull-down resistor. The wake-up signal is used to wake up the battery management module.

[0006] In one possible implementation, the first control module includes: The first comparator has its inverting input connected to the wake-up detection terminal and its non-inverting input connected to the first reference voltage terminal. When the voltage at the wake-up detection terminal is less than the first reference voltage at the first reference voltage terminal, the output terminal of the first comparator outputs a control signal.

[0007] In one possible implementation, the first control module further includes: A flip-flop is configured such that its set terminal is connected to the output terminal of a first comparator; wherein, when a control signal is output from the output terminal of the first comparator, the flip-flop is set and used to output the control signal.

[0008] In one possible implementation, the first control module further includes: The delay module has its input connected to the output of the trigger, and its output connected to the control terminal of the voltage regulation module and the second control module. The delay module is used to output the control signal after a delay.

[0009] In one possible implementation, the second control module includes: The second comparator has its inverting input connected to the wake-up detection terminal and its non-inverting input connected to the second reference voltage terminal. The first switch has its first terminal connected to the output terminal of the delay module, its second terminal connected to the output terminal of the second comparator, and its third terminal grounded. The first switch is turned on when the delay module outputs the control signal after a delay.

[0010] In one possible implementation, the second control module includes: The second switch has its first terminal connected to the second terminal of the first switch, its second terminal connected to the output terminal of the second comparator, and its third terminal connected to the wake-up signal output terminal. The second switch is turned on when the delay module outputs the control signal after a delay and the output terminal of the second comparator outputs a high-level enable signal.

[0011] In one possible implementation, the voltage regulation module includes: Adjust the resistance; The third switch, along with the regulating resistor, is connected in series between the wake-up power supply and the wake-up detection terminal.

[0012] In one possible implementation, the voltage regulation module further includes: The fourth switch is connected in series with the third switch between the wake-up power supply and the regulating resistor.

[0013] Secondly, embodiments of this application provide a battery management system, which includes: Such as the charging wake-up circuit provided in the first aspect; The charging interface has a connection detection terminal that is connected to the wake-up detection terminal of the charging wake-up circuit. The battery management module is connected to the output of the second control module in the charging wake-up circuit. The battery management module is used to trigger wake-up when it receives the wake-up signal output by the second control module, and to collect the resistance value of the confirmation resistor connected in the external charging device.

[0014] Thirdly, embodiments of this application provide a vehicle that includes the battery management system provided in the second aspect.

[0015] The charging wake-up circuit provided in this application uses a pull-up resistor connected between the wake-up detection terminal and the wake-up power supply, and a pull-down resistor connected between the wake-up detection terminal and the reference ground terminal. A first control module outputs a control signal based on the input voltage of the wake-up detection terminal, causing a voltage regulation module to raise the voltage between the wake-up detection terminal and the pull-down resistor under the action of this control signal. A second control module then outputs a wake-up signal to wake up the battery management module based on the raised voltage. Therefore, when no external charging equipment is connected, the voltage regulation module does not operate, and the wake-up detection terminal only maintains a default pull-up state. The power loss in the detection circuit is low, and even if the vehicle is parked for a long time, the wake-up power supply is unlikely to be depleted. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. It should be understood that the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] The attached diagram is described below: Figure 1 This is a circuit topology diagram of a charging wake-up circuit in related technologies; Figure 2 This is one of the functional module diagrams of a charging wake-up circuit provided in an embodiment of this application; Figure 3 This is a second schematic diagram of a functional module of a charging wake-up circuit provided in an embodiment of this application; Figure 4 This is a circuit topology diagram of a charging wake-up circuit provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: Pull-up resistor 110, wake-up detection terminal 120, wake-up power supply 130, pull-down resistor 140, reference ground terminal 150, first control module 160, voltage regulation module 170, second control module 180, sampling module 210, battery management module 220; Adjustment resistor R2, current limiting resistor R3, bias resistor R4, sampling resistor R5, protection resistor R6, first voltage divider resistor Ru1, second voltage divider resistor Rd1, third voltage divider resistor Ru2, fourth voltage divider resistor Rd2, fifth voltage divider resistor Ru3, sixth voltage divider resistor Rd3, first comparator U1, second comparator U2, trigger U3, first switch Q1, second switch Q2, third switch Q3, fourth switch Q4, fifth switch Q5, sampling switch Q6, first delay resistor Rt1, first delay capacitor C1, second delay resistor Rt2, second delay capacitor C2, wake-up signal output terminal A, sampling terminal B. Detailed Implementation

[0019] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0020] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0021] To facilitate a better understanding of the solutions in the embodiments of this application, the relevant technologies will be introduced first below.

[0022] Please see Figure 1 , Figure 1 This is a circuit topology diagram of a charging wake-up circuit in related technologies. For example... Figure 1As shown, the charging wake-up circuit in the related technology can be equipped with pull-up resistors R1-1 and R1-2, a wake-up switch Q1-1, a sampling switch Q1-2, and multiple voltage divider resistors (such as...). Figure 1 The resistors R1-3 to R1-8 in the circuit (the wake-up detection terminal, or CC terminal, of the charging wake-up circuit) can be connected to an external charging device, such as the connection detection terminal of the vehicle's charging interface. For vehicles that meet national or European charging standards, the vehicle-side charging interface does not need to be configured with a pull-down resistor by default. The connection detection after the charging connector is inserted can be achieved simply by configuring the value of the pull-up resistor. The static current is low when the charging connector is not inserted (such as a charging gun).

[0023] like Figure 1 The circuit topology shown works as follows: When the charging connector is inserted into the charging interface, the connection confirmation resistor in the external charging device (such as the resistor in the charging gun, which can also be called the CC resistor for ease of understanding) is connected to the wake-up detection terminal, i.e., the CC terminal. When the voltage at the CC terminal changes, the wake-up switch Q1-1 is turned on and outputs a high-level wake-up signal. The wake-up signal enables the system power supply and wakes up the system. After the system is woken up, the sampling switch Q1-2 is turned on, and the system can read the resistance value of the connection confirmation resistor in the external charging device through the sampling terminal, thereby completing the wake-up and sampling reading of the connection confirmation resistor.

[0024] However, as Figure 1 When the circuit topology shown is applied to vehicles conforming to the US charging standard, the US charging standard requires that the wake-up detection terminal of the vehicle-side charging interface also be equipped with a pull-down resistor of a certain value when the charging connector is not connected; a 2.7Ω resistor is commonly used. The pull-down resistor, for example, the 2.7... The pull-down resistor and pull-up resistor R1-1 are connected in series and then grounded. Furthermore, to accurately detect the plug status of the external charging connector, the resistance value of the pull-up resistor corresponding to the CC terminal should not be set too high. Thus, even if the vehicle enters sleep standby mode, the wake-up power supply will still form a continuous DC circuit through the pull-up and pull-down resistors, resulting in uninterrupted power loss; this is especially problematic for vehicles that have been parked for extended periods, easily leading to a depletion of the wake-up power supply. The wake-up power supply can be derived from the voltage of the vehicle's battery, and its continuous power consumption will further deplete the vehicle's battery.

[0025] like Figure 1 For vehicles that meet the Chinese and European charging standards, the circuit topology shown has a low static current when the charging gun is not plugged in, so there is basically no problem with power loss. However, once the vehicle needs to be compatible with the US charging standard, the default configuration of the pull-down resistor will change the original voltage division relationship. The wake-up power supply will form a continuous DC loop through the pull-up and pull-down resistors, resulting in uninterrupted power loss.

[0026] In related technologies, one approach to address the above problem is to accept a larger quiescent current, that is, to accept the risk of the wake-up power supply running out of power due to long-term vehicle parking; another approach is to increase the resistance value of the pull-up resistor corresponding to the CC terminal to reduce the quiescent current. However, after increasing the pull-up resistor, the wake-up level will decrease accordingly, and interference on the CC terminal can easily cause frequent false wake-ups.

[0027] It is evident that when the charging wake-up circuit in the relevant technology is applied to the US standard charging standard, there are problems such as a large static current causing the wake-up power supply to easily run out of power, and the problem of false wake-up after increasing the pull-up resistor.

[0028] Based on this, embodiments of this application provide a charging wake-up circuit, a battery management system, and a vehicle. The charging wake-up circuit, battery management system, and vehicle provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0029] The charging wake-up circuit provided in the embodiments of this application will be introduced first below.

[0030] Please see Figure 2 , Figure 2 This is one of the functional module diagrams of a charging wake-up circuit provided in an embodiment of this application. For example... Figure 2 As shown, the charging wake-up circuit may include a pull-up resistor 110, a pull-down resistor 140, a first control module 160, a voltage regulation module 170, and a second control module 180.

[0031] The pull-up resistor 110 is connected between the wake-up detection terminal 120 and the wake-up power supply 130. The wake-up detection terminal 120 is used to connect to an external charging device, such as a charging gun (or charging connector). For example, the wake-up detection terminal 120 can be connected to the connection detection terminal of the vehicle's charging interface. When the charging connector is inserted into the charging interface, the connection confirmation resistor in the external charging device can be connected to the wake-up detection terminal 120 via the connection detection terminal. The wake-up detection terminal 120 is, for example, a detection pin connected to the CC terminal of the charging interface; the external charging device is, for example, the charging gun of a charging station; and the connection confirmation resistor is, for example, the connection confirmation resistor inside the charging gun, i.e., the CC resistor.

[0032] The aforementioned wake-up power supply 130 is a power supply that continues to provide power even in the vehicle's sleep standby mode. For example, the wake-up power supply 130 can be a power source converted from the voltage of the vehicle's battery, such as a 5V power source converted from a 12V vehicle power supply. It is understood that the continuous power consumption of the wake-up power supply 130 will result in the continuous depletion of the vehicle's battery capacity.

[0033] The pull-down resistor 140 is connected between the wake-up detection terminal 120 and the reference ground terminal 150. The reference ground terminal 150 is, for example, the ground terminal of a charging wake-up circuit. The pull-up resistor 110 and the pull-down resistor 140 are connected in series between the wake-up power supply 130 and the reference ground terminal 150. They divide the voltage of the wake-up power supply 130, and the voltage at the wake-up detection terminal 120 is the voltage across the pull-down resistor 140. For example, the resistance value of the pull-down resistor 140 can be 2.7 ohms. This is to meet the US standard charging requirement of a 140Ω pull-down resistor in the vehicle-side charging interface.

[0034] Understandably, vehicles need to be compatible with multiple charging standards, such as Chinese national standards, European standards, and American standards, to achieve connection detection and charging system wake-up after the charging connector is inserted. Specifically, under Chinese and European charging standards, the vehicle-side charging interface does not require a 140Ω pull-down resistor by default, while the American charging standard requires a 140Ω pull-down resistor by default. The charging wake-up circuit provided in this application embodiment can maintain a low static current even with a default pull-down resistor of 140Ω, making it particularly suitable for vehicles compatible with the American charging standard, and also applicable to vehicles compatible with Chinese and European charging standards.

[0035] The input terminal of the first control module 160 is connected to the wake-up detection terminal 120. The first control module 160 is used to output a control signal according to the input voltage of the input terminal. The first control module 160 can be a module capable of outputting a corresponding level signal according to the magnitude of the input voltage, such as a module including a comparator. For example, when the voltage of the wake-up detection terminal 120 decreases due to the insertion of the charging connector, the first control module 160 outputs a control signal, such as a high-level control signal; when the voltage of the wake-up detection terminal 120 does not decrease as described above, the first control module 160 continuously outputs a low-level signal.

[0036] The voltage regulation module 170 is connected between the wake-up detection terminal 120, the wake-up power supply 130, and the output terminal of the first control module 160. It can be used to raise the voltage between the wake-up detection terminal 120 and the pull-down resistor 140 according to the control signal output by the first control module 160. The voltage regulation module 170 can be a module capable of changing the voltage division relationship at the wake-up detection terminal 120. For example, it can be a module that connects a parallel resistor to the pull-up resistor 110 when a control signal is received, thereby reducing the equivalent resistance on the pull-up side. After the equivalent resistance on the pull-up side decreases, the voltage divided by the pull-down resistor 140 increases, and the voltage between the wake-up detection terminal 120 and the pull-down resistor 140 is raised. It is understood that the voltage regulation module 170 can also adopt other circuit forms capable of raising this voltage, and this application does not limit this.

[0037] The input terminal of the second control module 180 is connected between the wake-up detection terminal 120 and the pull-down resistor 140. The second control module 180 can output a wake-up signal based on the voltage between the wake-up detection terminal 120 and the pull-down resistor 140; wherein, the wake-up signal is used to wake up the battery management module 220. It is understood that the node between the wake-up detection terminal 120 and the pull-down resistor 140 is the same voltage node as the wake-up detection terminal 120, and what the second control module 180 collects is the voltage of the wake-up detection terminal 120 relative to the reference ground terminal 150. The second control module 180 can be a module that outputs a corresponding level signal based on the magnitude of the collected voltage, for example, it can also be a module including a comparator. The battery management module 220 can be a module in the vehicle used to manage the power battery, such as a battery management unit. When the battery management module 220 receives the wake-up signal, it can switch from a dormant state to an operating state.

[0038] The output form of the above wake-up signal can be a continuous high level or a high-level pulse. This application does not limit this, as long as it can enable the battery management module 220 to switch from the sleep state to the working state.

[0039] In one possible implementation, the first control module 160 further includes: The delay module has its input terminal connected to the output terminal of the trigger U3, and its output terminal connected to the control terminal of the voltage regulation module 170 and the second control module 180, respectively. The delay module is used to output the control signal after a delay.

[0040] In this embodiment, the control signal is output after a delay by the delay module. The voltage fluctuation on the wake-up detection terminal 120 when the charging connector is inserted will not be immediately transmitted to the subsequent circuit. The circuit operation is more stable and can prevent malfunctions caused by the fluctuation.

[0041] The aforementioned delay module can be used to delay the input signal, i.e., the control signal, for a certain period of time before outputting it.

[0042] In some embodiments, the delay module can be an RC delay circuit composed of resistors and capacitors. That is, the control signal charges the capacitor through the resistor, the voltage across the capacitor gradually increases, and the subsequent switch is turned on when the voltage across the capacitor rises to the conduction threshold of the subsequent switch, thereby achieving the delay. The length of the delay can be adjusted by the resistance value of the resistor and the capacitance value of the capacitor.

[0043] Please see Figure 3 , Figure 3 The second schematic diagram of a charging wake-up circuit provided in this application embodiment shows that after the wake-up signal wakes up the battery management module 220, the battery management module 220 can control the sampling module 210 to sample the voltage of the wake-up detection terminal 120, thereby determining the CC resistor.

[0044] It should be noted that the battery management module 220 is only used for ease of explanation. Figure 3 The image shows a connection to the sampling module 210, but the battery management module 220 may not be a component of the charging wake-up circuit provided in the embodiments of this application.

[0045] For ease of understanding, the operation of the charging wake-up circuit in the above embodiments is described below in at least the following stages: In Phase 1, when the charging connector is not connected, the wake-up detection terminal 120 is connected to the wake-up power supply 130 only through the pull-up resistor 110 and to the reference ground terminal 150 through the pull-down resistor 140. The voltage of the wake-up detection terminal 120 remains stable. The first control module 160 does not output a control signal, the voltage regulation module 170 does not work, and the second control module 180 does not output a wake-up signal.

[0046] In Phase Two, with the charging connector inserted into the charging interface, the connection confirmation resistor and pull-down resistor 140 in the external charging device are connected in parallel, reducing the equivalent resistance on the pull-down side. After a certain time extension by the delay module, the voltage of the wake-up detection terminal 120 decreases. When the voltage of the wake-up detection terminal 120 decreases and is less than the first reference voltage of the first control module 160, the first control module 160 outputs a control signal; the voltage adjustment module 170 raises the voltage between the wake-up detection terminal 120 and the pull-down resistor 140 according to the control signal after the delay module; the second control module 180 operates and outputs a wake-up signal to wake up the battery management module 220. In Phase 3, when the charging connector is unplugged after charging is complete, the connection confirmation resistor and the pull-down resistor 140 are disconnected in parallel. The voltage between the wake-up detection terminal 120 and the pull-down resistor 140 increases and exceeds the second reference voltage of the second control module 180. The second control module 180 stops outputting the wake-up signal (e.g., changes from a high-level signal to a low-level signal), the voltage adjustment module 170 stops adjusting, and the charging wake-up circuit returns to the state where only the pull-up resistor 110 and the pull-down resistor 140 divide the voltage.

[0047] In this embodiment, the pull-up resistor 110 can be set to a relatively large value. In the vehicle's sleep standby mode, the wake-up power supply 130 forms a circuit only through the pull-up resistor 110 and the pull-down resistor 140, resulting in a small static current in the circuit. Therefore, even if the vehicle is parked for a long time, the wake-up power supply 130 is less likely to run out of power, and consequently, the vehicle battery is less likely to run out of power. When the charging connector is inserted, the first control module 160 first outputs a control signal based on the voltage change of the wake-up detection terminal 120, and the voltage regulation module 170 then raises the voltage of the wake-up detection terminal 120. After a certain delay, the second control module 180 can output a control signal to wake the vehicle. Furthermore, after charging is completed and the charging connector is unplugged, the second control module 180 stops outputting the wake-up signal, the voltage regulation module 170 is turned off, and the charging wake-up circuit returns to a state where only the pull-up resistor 110 and the pull-down resistor 140 divide the voltage. This satisfies the US standard charging requirements for the pull-down resistor 140 while reducing the static current when the vehicle is parked, thus preventing the wake-up power supply 130 from running out of power.

[0048] Please see Figure 4 , Figure 4 This application provides a circuit topology diagram of a charging wake-up circuit. Figure 4 In some embodiments, the pull-up resistor 110 may include resistor R1, and the pull-down resistor 140 may include resistor R0.

[0049] In one possible implementation, the first control module 160 includes: The first comparator U1 has its inverting input connected to the wake-up detection terminal 120 and its non-inverting input connected to the first reference voltage terminal. When the voltage at the wake-up detection terminal 120 is less than the first reference voltage at the first reference voltage terminal, the output of the first comparator U1 outputs a control signal.

[0050] In this embodiment, the voltage at the wake-up detection terminal 120 is compared with the first reference voltage through the first comparator U1. The comparison speed is fast, the circuit structure is simple and the cost is low. Furthermore, the first reference voltage can be flexibly set, and the detection sensitivity is easy to adjust.

[0051] The first comparator U1 can compare the voltages at its two input terminals and output a high or low level based on the comparison result. When the voltage at its non-inverting input terminal is greater than the voltage at its inverting input terminal, the first comparator U1 outputs a high level; otherwise, the first comparator U1 outputs a low level.

[0052] The non-inverting input of the first comparator U1 is connected to the first reference voltage terminal, and its inverting input is connected to the wake-up detection terminal 120. Therefore, when the voltage of the wake-up detection terminal 120 is less than the first reference voltage, the first comparator U1 outputs a high level, which is the control signal; when the voltage of the wake-up detection terminal 120 is higher than the first reference voltage, the first comparator U1 outputs a low level, which can be understood as not outputting a control signal.

[0053] The aforementioned first comparator U1 may further include a power supply terminal and a ground terminal, the power supply terminal being connected to the wake-up power supply 130 (in... Figure 4 The first comparator U1 (also referred to as V1) can be connected to the reference ground 150 at its ground terminal, and the wake-up power supply 130 provides the operating voltage for the first comparator U1. Since the first comparator U1 is in working state in sleep standby mode, a model with low static power consumption can be selected for the first comparator U1 to further reduce the overall power consumption of the charging wake-up circuit in sleep standby mode.

[0054] In some embodiments, the first comparator U1 may be a comparator chip or a comparator circuit composed of an operational amplifier, and this application does not limit this.

[0055] In some embodiments, the charging wake-up circuit further includes: The first reference voltage module includes a first voltage divider resistor Ru1 and a second voltage divider resistor Rd1 connected in series between the wake-up power supply 130 and the reference ground terminal 150. The voltage divider node between the first voltage divider resistor Ru1 and the second voltage divider resistor Rd1 forms the first reference voltage terminal.

[0056] In the embodiments of this application, the first reference voltage can be provided by using two voltage divider resistors. The structure is simple and the cost is low. Moreover, the first reference voltage can be easily adjusted according to actual needs, which helps to improve the flexibility of circuit design.

[0057] For example, the first terminal of the first voltage divider resistor Ru1 is connected to the wake-up power supply 130, the second terminal of the first voltage divider resistor Ru1 is connected to the first terminal of the second voltage divider resistor Rd1 and the non-inverting input terminal of the first comparator U1, and the second terminal of the second voltage divider resistor Rd1 is grounded. The first voltage divider resistor Ru1 and the second voltage divider resistor Rd1 divide the voltage of the wake-up power supply 130, and the voltage at the voltage divider node is the first reference voltage; the magnitude of the first reference voltage can be adjusted by adjusting the resistance ratio of the first voltage divider resistor Ru1 and the second voltage divider resistor Rd1. The resistance values ​​of the first voltage divider resistor Ru1 and the second voltage divider resistor Rd1 can be in the kiloohm range, and this application does not limit the specific resistance values.

[0058] It is understood that the first reference voltage terminal can also be provided by other forms of reference voltage circuits, such as Zener diodes, reference voltage chips, etc., as long as a stable reference voltage can be provided to the non-inverting input terminal of the first comparator U1. In addition, the voltage divider resistor method used in this application embodiment is simple in structure, low in cost, and does not require an additional power supply circuit, thus not increasing the quiescent current in the sleep standby mode.

[0059] In one possible implementation, the first control module 160 further includes: Flip-flop U3 is connected to the output of the first comparator U1. When the first comparator U1 outputs a control signal, flip-flop U3 is set and used to output the control signal.

[0060] In this embodiment, the control signal is latched by the trigger U3, the access state of the voltage regulation module 170 is stable and reliable, and the circuit will not repeatedly operate due to momentary interference; and the trigger U3 can automatically reset after the charging connector is unplugged, and the circuit state switching is clear.

[0061] The aforementioned flip-flop U3 is a logic device with a state retention function. In some embodiments, flip-flop U3 can be a D flip-flop U3. When its set terminal (i.e., pin S) receives a valid level, such as a high level, flip-flop U3 is set, and its output terminal (i.e., pin Q) continuously outputs a valid level until flip-flop U3 is reset (specifically, when pin R receives a low level).

[0062] For example, the set terminal of the D flip-flop U3 is connected to the output terminal of the first comparator U1, and the output terminal of the D flip-flop U3 is used to output a control signal. It is understood that other components or circuits that can achieve the set and hold function, besides the flip-flop U3, are also applicable, and this application does not limit them.

[0063] For example, in addition to the set terminal and the output terminal, the trigger U3 may also include a clock terminal and an inverting output terminal. In this embodiment, the clock terminal can be connected to a fixed level, and the inverting output terminal can be left floating. The control signal latching can be achieved using only the set terminal and the output terminal. The power supply terminal of the trigger U3 can be connected to the wake-up power supply 130 to ensure that it is in an operational state in the sleep standby mode.

[0064] Thus, even if the control signal output by the first comparator U1 is a momentary high-level signal, the flip-flop U3 can continue to output a high-level signal after it is set, and the voltage regulation module 170 can maintain its connected state, avoiding repeated switching of the voltage regulation module 170 due to the disappearance of the control signal.

[0065] In some embodiments, the reset terminal of trigger U3 can be connected to the output terminal of the second control module 180 (specifically to...). Figure 4 When the output of the second comparator U2 is connected to the second control module 180, for example, when the voltage of the wake-up detection terminal 120 increases after the charging connector is unplugged and the second comparator U2 outputs a low level, the trigger U3 is reset, the output of the trigger U3 stops outputting the control signal (i.e., the high-level signal), the voltage regulation module 170 is disconnected and stops regulating, and the charging wake-up circuit returns to the state of sleep standby mode.

[0066] In some embodiments, the delay module includes: The first delay sub-circuit is connected between the output terminal of the trigger U3 and the control terminal of the voltage regulation module 170. The first delay sub-circuit is used to delay the control signal for a first duration before outputting it to the control terminal of the voltage regulation module 170. The second delay sub-circuit is connected between the output terminal of the flip-flop U3 and the second control module 180. The second delay sub-circuit is used to output the control signal to the second control module 180 after delaying the control signal for a second duration.

[0067] In this embodiment, the operation of the voltage regulation module 170 and the output of the second control module 180 are controlled by two delay sub-circuits respectively. The timing of voltage regulation and wake-up confirmation can be adjusted separately, making the circuit debugging flexible and easy to adapt to different application requirements.

[0068] In some embodiments, both the first delay sub-circuit and the second delay sub-circuit can be RC delay circuits.

[0069] For example, in Figure 4 In the circuit, the first delay sub-circuit consists of a first delay resistor Rt1 and a first delay capacitor C1, and the second delay sub-circuit consists of a second delay resistor Rt2 and a second delay capacitor C2. By setting different resistance and capacitance values, the first duration and the second duration can be controlled.

[0070] Specifically: The first delay sub-circuit outputs the control signal to the control terminal of the voltage regulation module 170 after a first delay. The voltage regulation module 170 is turned on after the first delay and begins to raise the voltage of the wake-up detection terminal 120. The second delay sub-circuit outputs the control signal to the output terminal of the second control module 180 after a second delay. The second control module 180 is only able to output the wake-up signal after the second delay.

[0071] In some embodiments, the first duration is shorter than the second duration.

[0072] In this embodiment of the application, by setting the first duration to be less than the second duration, voltage regulation can be completed first, and then wake-up judgment can be performed, which helps to improve the accuracy of wake-up judgment and further avoid false wake-ups.

[0073] Specifically, after trigger U3 outputs a control signal, voltage regulation module 170 operates first. Only after a certain period does the second control module 180 meet the conditions for outputting a wake-up signal. Thus, when the second control module 180 determines whether to output a wake-up signal, the voltage regulation module 170 has already completed raising the voltage at the wake-up detection terminal 120, and the voltage at the wake-up detection terminal 120 has stabilized. The second control module 180 then acquires the stabilized voltage, resulting in a more accurate judgment. Conversely, if the first duration is not less than the second duration, the second control module 180 might make a judgment before the voltage at the wake-up detection terminal 120 has stabilized, easily misinterpreting the instantaneous voltage during the adjustment process as meeting the wake-up conditions.

[0074] For example, the first duration can be set to more than the time required for the voltage regulation module 170 to complete the voltage rise, for example, several milliseconds to tens of milliseconds; the second duration can be set to add a certain time margin on the basis of the first duration, so that when the second control module 180 starts to judge, the voltage of the wake-up detection terminal 120 has undergone a sufficient stabilization process, avoiding false triggering such as interference or the charging gun popping out immediately after being inserted.

[0075] This application does not limit the specific values ​​of the first duration and the second duration of the delay. The specific values ​​of the delay resistor and the delay capacitor can be adjusted according to actual needs to change the corresponding delay duration.

[0076] In one possible implementation, the second control module 180 further includes: The first switch Q1 has its first terminal connected to the second delay sub-circuit, its second terminal connected to the output terminal of the second control module 180, and its third terminal grounded. The first switch Q1 is turned on when the second delay sub-circuit delays the control signal for a second duration.

[0077] In this embodiment, the conduction control of the second switch Q2 after the delay is reached can be achieved by combining the controllable first switch Q1 with the second delay sub-circuit.

[0078] The first switch Q1 mentioned above is a controllable switch, such as a transistor. In this case, the first, second, and third terminals of the first switch Q1 can be the base, collector, and emitter of the transistor, respectively. In addition to a transistor, the first switch Q1 can also be a MOSFET, a relay, or other controllable switches, and this application does not limit this to any particular type.

[0079] In one possible implementation, the second control module 180 includes: The second comparator U2 has its inverting input connected to the wake-up detection terminal 120 and its non-inverting input connected to the second reference voltage terminal. The first switch Q1 has its first terminal connected to the output terminal of the delay module, its second terminal connected to the output terminal of the second comparator U2, and its third terminal grounded. The first switch Q1 is turned on when the delay module outputs the control signal after a delay.

[0080] The first end of the first switch Q1 is connected to the output end of the delay module, that is, the first end of the first switch Q1 is connected to the second delay sub-circuit in the aforementioned embodiment.

[0081] In one possible implementation, the second control module includes: The second switch Q2 has its first end connected to the second end of the first switch Q1, its second end connected to the output of the second comparator U2, and its third end connected to the wake-up signal output. The second switch Q2 is turned on when the delay module outputs the control signal after a delay and the output of the second comparator U2 outputs a high-level enable signal.

[0082] The aforementioned delay module outputs the control signal after a delay, that is, it uses the second delay sub-circuit to output the control signal after a second delay duration.

[0083] In this embodiment, the conduction of the second switch Q2 requires the simultaneous fulfillment of two conditions: a delay arrival and a high-level output from the second comparator U2. Furthermore, after the delay arrives, the conduction of the first switch Q1 enables control of the first terminal of the second switch Q2, i.e., its control terminal. This is equivalent to performing a secondary confirmation of the connection of the charging connector after voltage regulation is completed to ensure a stable connection. Interference on the wake-up detection terminal 120 is also less likely to cause false wake-ups, thereby improving the reliability and accuracy of wake-up.

[0084] In some embodiments, the second switch Q2 can be a PMOS transistor. The output of the second comparator U2 can be connected to the second terminal of the second switch Q2 via a current-limiting resistor R3. After the second delay sub-circuit delays for the second duration, the first switch Q1 is turned on and grounded, pulling the potential of the first terminal of the second switch Q2 low. The second switch Q2 is then turned on, and the wake-up signal output terminal A outputs a high-level wake-up signal.

[0085] The aforementioned wake-up signal output terminal A is the output terminal of the second control module 180.

[0086] It is understandable that the second switch Q2 needs to meet the following two conditions simultaneously to be turned on: The arrival of the delays in the first and second delay sub-circuits indicates that the voltage adjustment module 170 has completed the voltage boosting of the wake-up detection terminal 120. Second, the high-level enable signal output of the second comparator U2 indicates that the voltage at the wake-up detection terminal 120 is still lower than the second reference voltage after the voltage is boosted, and a connection confirmation resistor is stably connected at the wake-up detection terminal 120. If the voltage drop at the wake-up detection terminal 120 is caused by interference, the interference will disappear after the voltage adjustment module 170 boosts the voltage, the voltage at the wake-up detection terminal 120 will rise back and be greater than the second reference voltage, the second comparator U2 will output a low level, the second switch Q2 will be turned off, and the wake-up signal output terminal A will not output a wake-up signal.

[0087] In some embodiments, the charging wake-up circuit further includes: The second reference voltage module includes a third voltage divider resistor Ru2 and a fourth voltage divider resistor Rd2 connected in series between the wake-up power supply 130 and the reference ground terminal 150. The voltage divider node between the third voltage divider resistor Ru2 and the fourth voltage divider resistor Rd2 forms the second reference voltage terminal.

[0088] In the embodiments of this application, the second reference voltage is also provided by two voltage divider resistors, which is simple in structure and low in cost. Furthermore, the second reference voltage can be set independently from the first reference voltage, which facilitates the cooperation with two comparators to complete two-stage judgment.

[0089] For example, the first terminal of the third voltage divider resistor Ru2 is connected to the wake-up power supply 130, the second terminal of the third voltage divider resistor Ru2 is connected to the first terminal of the fourth voltage divider resistor Rd2 and the non-inverting input terminal of the second comparator U2, and the second terminal of the fourth voltage divider resistor Rd2 is grounded. The third voltage divider resistor Ru2 and the fourth voltage divider resistor Rd2 divide the voltage of the wake-up power supply 130, and the voltage at the voltage divider node is the second reference voltage. By adjusting the resistance ratio of the third voltage divider resistor Ru2 and the fourth voltage divider resistor Rd2, the magnitude of the second reference voltage can be adjusted.

[0090] It should be noted that this application does not specify a particular value for the second reference voltage. It only requires that, after the adjusting resistor R2 is connected to the circuit and the charging gun is disconnected from the wake-up detection terminal 120, the second reference voltage is less than the voltage at the wake-up detection terminal 120, thus enabling the output of the second comparator U2 to output a low level. When the output of the second comparator U2 outputs a low level, the trigger U3 connected to the output of the second comparator U2 maintains a low output level, the voltage regulation module 170 is disconnected, and no longer consumes power.

[0091] In one possible implementation, the voltage regulation module 170 includes: Adjust resistor R2; The third switch Q3 is connected in series with the regulating resistor R2 between the wake-up power supply 130 and the wake-up detection terminal 120.

[0092] In this embodiment, the voltage regulation module 170 raises the voltage of the wake-up detection terminal 120 by means of parallel regulation resistor R2. The circuit structure is simple, and the regulation resistor R2 is completely disconnected when not working, so no additional static current is generated and no power loss is caused in the sleep standby mode.

[0093] For example, the third switch Q3 can be a PMOS transistor, the drain of which is connected to the first end of the regulating resistor R2, the second end of the regulating resistor R2 is connected to the wake-up detection terminal 120, and the gate of the PMOS transistor serves as the control terminal of the third switch Q3.

[0094] It is understood that the voltage regulation module 170 may also adopt other circuit forms that can change the equivalent resistance of the pull-up side, such as a resistor network composed of multiple resistors and multiple switches, which is not limited in this application.

[0095] Optionally, the selection of the regulating resistor R2 can be determined in conjunction with the resistance values ​​of the pull-up resistor 110, the pull-down resistor 140, and the connection confirmation resistor, so that after the regulating resistor R2 is connected, the voltage of the wake-up detection terminal 120 will have a significant difference between the two cases where the charging connector is connected and not connected. In some embodiments, the regulating resistor R2 can be a single resistor, or it can be an integration of multiple resistors connected in series, parallel, or in a mixed manner; this application does not limit this.

[0096] In some embodiments, the resistance value of the adjusting resistor R2 is less than the resistance value of the pull-up resistor 110.

[0097] Specifically, after adjusting resistor R2 is added, the equivalent resistance on the pull-up side can be further reduced, the voltage of the wake-up detection terminal 120 increases significantly, and the voltage difference of the wake-up detection terminal 120 corresponding to whether the charging connector is connected or not is also more obvious.

[0098] In one possible implementation, the voltage regulation module 170 further includes: The fourth switch Q4 is connected in series with the third switch Q3 between the wake-up power supply 130 and the regulating resistor R2.

[0099] In this embodiment, the connection of the regulating resistor R2 is jointly controlled by the third switch Q3 and the fourth switch Q4, which can further improve the reliability of the control.

[0100] For example, the fourth switch Q4 can also be a PMOS transistor. The fourth switch Q4 is connected in series with the third switch Q3, and then connected in series with the regulating resistor R2 between the wake-up power supply 130 and the wake-up detection terminal 120. The regulating resistor R2 is only connected to the circuit when both the third switch Q3 and the fourth switch Q4 are turned on; when either one is turned off, the regulating resistor R2 is disconnected. In this way, on the one hand, the two switches connected in series can share the withstand voltage, reducing the risk of abnormal conduction of a single switch; on the other hand, the selection and connection method of the two switches are more flexible, for example, a suitable switch combination can be selected according to the level of the control signal.

[0101] In some embodiments, the voltage regulation module 170 further includes: The fifth switch Q5 has its first end connected to the output end of the first control module 160, and its second end connected to the control ends of the third switch Q3, the fourth switch Q4, and the wake-up power supply 130. The fifth switch Q5 is used to control the third switch Q3 and the fourth switch Q4 to be turned on or off according to the control signal.

[0102] In this embodiment, the fifth switch Q5 is turned on by the control signal (high-level signal) output by the trigger U3, and the control terminals of the third switch Q3 and the fourth switch Q4 are grounded and connected to a low level, so both the third switch Q3 and the fourth switch Q4 are turned on. Furthermore, when the trigger U3 does not output a control signal (high-level signal), the control terminals of the third switch Q3 and the fourth switch Q4 are pulled up to a high level by default and turned off. This control method is reliable and will not cause false turn-on.

[0103] For example, both the third switch Q3 and the fourth switch Q4 are PMOS transistors. A PMOS transistor conducts when its control terminal is low and is turned off when it is high. However, the control signal output by the first control module 160 is a high-level signal, which cannot directly drive the third switch Q3 and the fourth switch Q4 to conduct. Therefore, a fifth switch Q5 is used for level conversion. The fifth switch Q5 can be, for example, an NPN transistor, with its first and second terminals being the base and collector of the transistor, respectively, and its emitter grounded. The second terminal of the fifth switch Q5 is also connected to the wake-up power supply 130 via a bias resistor R4. When no control signal is output, the fifth switch Q5 is off, and the control terminals of the third switch Q3 and the fourth switch Q4 are pulled up to the voltage of the wake-up power supply 130 through the bias resistor R4, maintaining a high level, and the third switch Q3 and the fourth switch Q4 are reliably turned off; when the first control module 160 outputs a high-level control signal, the fifth switch Q5 is turned on, pulling the control terminals of the third switch Q3 and the fourth switch Q4 down to near a low potential, the third switch Q3 and the fourth switch Q4 are turned on, the adjusting resistor R2 is connected to the circuit, and electrically connected to the wake-up detection terminal 120.

[0104] The first terminal of the fifth switch Q5 can be connected to the output terminal of the first control module 160 via the first delay sub-circuit. That is, the control signal drives the fifth switch Q5 to conduct after a first delay, thereby making the operation of the voltage regulation module 170 controllable. The resistance value of the bias resistor R4 can be set to be relatively large so that the current flowing through the bias resistor R4 is small when the fifth switch Q5 is turned off, thus avoiding increasing the static current in the sleep standby mode.

[0105] In some embodiments, the charging wake-up circuit may further include, for example, Figure 3 The sampling module 210 shown is used for external connection such as Figure 3 The battery management module 220 and sampling module 210 shown may include a sampling switch Q6 and a sampling resistor R5. The sampling resistor R5 and the battery management module 220 can be grounded through a protection resistor R6.

[0106] Specifically, sampling switch Q6 and sampling resistor R5 are connected in series at wake-up detection terminal 120 and... Figure 4 Between the sampling terminals B, the control terminal of the sampling switch Q6 is connected to the second power supply terminal V2; when the battery management module 220 is woken up, the second power supply terminal V2 outputs a high-level enable signal, the sampling switch Q6 is turned on, the battery management module 220 collects the voltage of the wake-up detection terminal 120 through the sampling terminal B, and calculates the resistance value of the internal connection confirmation resistor of the external charging device based on the collected voltage.

[0107] The second power supply terminal V2 can be a power source that supplies power only after the battery management module 220 is woken up, such as a 12V power supply after wake-up. The sampling switch Q6 can be an NMOS transistor, and its control terminal can be connected to the second power supply terminal V2 via the fifth voltage divider resistor Ru3 and grounded via the sixth voltage divider resistor Rd3. The battery management module 220 can convert the voltage at the sampling terminal B into the resistance value of the CC resistor after analog-to-digital conversion, thereby confirming the connection status and specifications of the charging connector. It is understood that the sampling module 210 is used to acquire the resistance value of the connection confirmation resistor after wake-up, and it can adopt the sampling circuit in related technologies. This application does not limit the specific form of the sampling module 210.

[0108] This application embodiment also provides a battery management system, which includes: The charging wake-up circuit provided in the foregoing embodiments; The charging interface has a connection detection terminal that is connected to the wake-up detection terminal of the charging wake-up circuit. The battery management module is connected to the output of the second control module of the charging wake-up circuit. The battery management module is used to trigger wake-up when it receives the wake-up signal output by the second control module, and to collect the resistance value of the confirmation resistor connected in the external charging device.

[0109] This application also provides a vehicle that includes the battery management system described in the above embodiments. The vehicle may be, for example, a pure electric vehicle or a hybrid vehicle, and its charging interface may be compatible with charging connectors of various charging standards such as Chinese national standards, European standards, and American standards.

[0110] It is understood that the above battery management system and vehicle have the beneficial effects of the charging wake-up circuit provided in the embodiments of this application. For details, please refer to the specific descriptions of the above embodiments. This embodiment will not be repeated here.

[0111] 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.

Claims

1. A charging wake-up circuit, characterized in that, The charging wake-up circuit includes: A pull-up resistor is connected between the wake-up detection terminal and the wake-up power supply. The wake-up detection terminal is used to connect to an external charging device. A pull-down resistor is connected between the wake-up detection terminal and the reference ground terminal; A first control module, the input terminal of which is connected to the wake-up detection terminal, is used to output a control signal according to the input voltage of the input terminal of the first control module; A voltage regulation module is connected between the wake-up detection terminal, the wake-up power supply, and the output terminal of the first control module. The voltage regulation module is used to raise the voltage between the wake-up detection terminal and the pull-down resistor according to the control signal output by the first control module. The second control module has its input terminal connected between the wake-up detection terminal and the pull-down resistor. The second control module is used to output a wake-up signal based on the voltage between the wake-up detection terminal and the pull-down resistor; wherein the wake-up signal is used to wake up the battery management module.

2. The charging wake-up circuit as described in claim 1, characterized in that, The first control module includes: A first comparator has its inverting input connected to the wake-up detection terminal and its non-inverting input connected to a first reference voltage terminal. When the voltage at the wake-up detection terminal is less than the first reference voltage at the first reference voltage terminal, the first comparator outputs the control signal.

3. The charging wake-up circuit as described in claim 2, characterized in that, The first control module further includes: A trigger, wherein the set terminal of the trigger is connected to the output terminal of the first comparator; wherein, when the control signal is output at the output terminal of the first comparator, the trigger is set and used to output the control signal.

4. The charging wake-up circuit as described in claim 3, characterized in that, The first control module further includes: The delay module has its input terminal connected to the output terminal of the trigger, and its output terminal connected to the control terminal of the voltage regulation module and the second control module, respectively. The delay module is used to output the control signal after a delay.

5. The charging wake-up circuit as described in claim 4, characterized in that, The second control module includes: The second comparator has its inverting input connected to the wake-up detection terminal and its non-inverting input connected to the second reference voltage terminal. A first switch is connected to the output of the delay module, a second terminal of the first switch is connected to the output of the second comparator, and a third terminal of the first switch is grounded; wherein, when the delay module outputs the control signal after a delay, the first switch is turned on.

6. The charging wake-up circuit as described in claim 5, characterized in that, The second control module includes: The second switch has a first end connected to the second end of the first switch, a second end connected to the output of the second comparator, and a third end connected to the wake-up signal output. The second switch is turned on when the delay module outputs the control signal after a delay and the output of the second comparator outputs a high-level enable signal.

7. The charging wake-up circuit as described in claim 1, characterized in that, The voltage regulation module includes: Adjust the resistance; The third switch is connected in series with the regulating resistor between the wake-up power supply and the wake-up detection terminal.

8. The charging wake-up circuit as described in claim 7, characterized in that, The voltage regulation module further includes: A fourth switch is connected in series with the third switch between the wake-up power supply and the regulating resistor.

9. A battery management system, characterized in that, include: The charging wake-up circuit as described in any one of claims 1 to 8; A charging interface, wherein the connection detection terminal of the charging interface is connected to the wake-up detection terminal of the charging wake-up circuit; A battery management module is connected to the output of the second control module of the charging wake-up circuit. The battery management module is used to trigger wake-up when it receives a wake-up signal output by the second control module, and to collect the resistance value of the confirmation resistor connected in the external charging device.

10. A vehicle, characterized in that, Includes the battery management system as described in claim 9.

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