BMS Sleep Wake-up Circuit, Method, BMS, and Electrical Equipment

Abstract

The present application discloses a BMS sleep wake-up circuit, method, BMS, and electrical device. The BMS sleep wake-up circuit is provided with an enabling circuit that can generate an enabling level with a preset duration when a charging device is connected to enable a wake-up chip to start and wake up the BMS in a sleep state, and a self-locking signal is output through a control circuit so that the wake-up chip keeps the BMS awake; in addition, when the charging device remains unplugged, after canceling the self-locking signal, the wake-up chip is turned off, so that the BMS can enter the sleep state, solving the problem in the related art that the BMS cannot enter the sleep state when the charging device is not unplugged.

Description

Technical Field

[0001] This application relates to the field of battery management, and particularly to a BMS sleep wake-up circuit, method, BMS and electrical equipment. Background Art

[0002] On new energy electric vehicle products, charging is an essential function. For the charging interface with a high-level input of the national standard charging gun (such as the AC_CP interface of the AC charging gun), the vehicle design requires that the battery management system (BMS) can be awakened after the charging gun is inserted into the vehicle. When engineers are designing, they focus on the plug-in gun wake-up function and often ignore that the BMS also needs to support entering the sleep state when the charging gun is not pulled out. At this time, when charging is completed or stopped but the charging gun is not pulled out, the BMS cannot enter the sleep state, thus increasing the power consumption of the vehicle's lead-acid battery. Summary of the Invention

[0003] In view of the above problems, the embodiments of this application provide a BMS sleep wake-up circuit, method, BMS and electrical equipment, which can solve the problem that the BMS cannot enter the sleep state when the charging gun charging device is not pulled out.

[0004] In a first aspect, the embodiments of this application provide a BMS sleep wake-up circuit, including:

[0005] A first detection port, configured to connect to the communication interface of the charging device when the charging device is connected;

[0006] An enabling circuit, connected to the first detection port and the wake-up chip of the BMS, configured to generate an enabling level with a preset duration according to a first level signal provided by the charging device to enable the wake-up chip to start and wake up the BMS in the sleep state when the charging device is connected;

[0007] A control circuit, configured to output a self-locking signal to the wake-up chip to maintain the wake-up chip in the start state after the BMS is awakened, and is further configured to stop outputting the self-locking signal to turn off the wake-up chip when receiving a sleep signal, so that the BMS enters the sleep state.

[0008] In the technical solution of the embodiment of the present application, an enabling circuit is provided. When a charging device is connected, an enabling level with a preset duration is generated according to a first level signal provided by the communication interface of the charging device. The enabling level with the preset duration enables the wake-up chip to start and wake up the BMS in the sleep state (i.e., start), and a self-locking signal is output through a control circuit so that the wake-up chip keeps the BMS awake. In addition, when the charging device remains unplugged, since the enabling level only lasts for the preset duration and then needs to enter the sleep state, the self-locking signal is cancelled and the wake-up chip is turned off, so that the BMS can enter the sleep state, solving the problem in the related art that the BMS cannot enter the sleep state when the charging device is not unplugged. In addition, since the generated enabling level will surely generate an edge signal, the wake-up chip triggered by either an edge or a level can meet the requirement of being able to put the BMS to sleep while keeping the charging device connected, thereby reducing the lead-acid consumption of the battery.

[0009] In some embodiments, the enabling circuit includes:

[0010] A detection module, connected to the first detection port, for outputting a first detection signal according to the first level signal provided by the charging device;

[0011] An enabling module, connected to the detection module, for generating and outputting an enabling level with a preset duration according to the first detection signal.

[0012] In the technical solution of the embodiment of the present application, an embodiment of an enabling circuit is provided. The first level signal provided by the charging device is detected by the detection module, and the enabling module generates an enabling level with a preset duration according to the first level signal to start the wake-up chip to wake up the BMS in the sleep state. The circuit is simple and reliable.

[0013] In some embodiments, the detection module includes a first switching tube and a first resistor. The control end of the first switching tube is connected to the first detection port. The first end of the first switching tube is connected to a first power supply through the first resistor. The second end of the first switching tube is connected to the ground. The first end of the first switching tube is connected to the enabling module. The first switching tube outputs the first detection signal under the drive of the first level signal.

[0014] In the technical solution of the embodiment of the present application, an implementation manner of the detection module is provided. The first level signal is, for example, a high-level signal, and the first detection signal is, for example, a low-level signal. The circuit structure is simple and reliable, and the cost is also low.

[0015] In some embodiments, the detection module further includes a first energy storage device and a first unidirectional conduction device. The input end of the first unidirectional conduction device is connected to the first detection port. The output end of the first unidirectional conduction device is connected to one end of the first energy storage device and the control end of the first switching tube. The other end of the first energy storage device is grounded. The first energy storage device is configured to store energy based on the first level signal to drive the first switching tube to conduct.

[0016] In the technical solution of the embodiment of the present application, an implementation manner of an enabling module is provided. When the first detection signal is, for example, a PWM signal, through energy storage and filtering by the first energy storage device, the control end of the first switching tube can maintain a certain stable level above a certain frequency and duty cycle of the PWM signal, so that the first switching tube can conduct and output the first detection signal. Additionally, in the low-level stage of the PWM signal, the first unidirectional conduction device can prevent the voltage at the control end of the first switching tube from being pulled down by the input, failing to provide the first detection signal for a sufficient duration, thereby causing the enabling circuit to fail to enable and wake up the chip to start.

[0017] In some embodiments, the detection module further includes a voltage regulator device connected to the control end of the first switching tube for stabilizing the voltage at the control end of the first switching tube.

[0018] In the technical solution of the embodiment of the present application, it starts to work when the voltage input to the control end of the first switching tube can be greater than a certain value, and clamps the voltage at the control end of the first switching tube at a certain voltage value to protect the first switching tube from being damaged. The maximum clamping voltage selected for the voltage regulator device needs to be less than the withstand voltage from the control end to the second end of the first switching tube.

[0019] In some embodiments, it further includes a second detection port and a second unidirectional conduction device, and the second unidirectional conduction device is connected in the forward direction between the second detection port and the control end of the first switching tube.

[0020] In the technical solution of the embodiment of the present application, the second detection port can be used to access a level signal or a PWM signal, providing another channel for waking up and putting the BMS into sleep. The function of the second unidirectional conduction device is similar to that of the above-mentioned first unidirectional conduction device.

[0021] In some embodiments, the enabling module includes a second energy storage device, a second switching tube, a second resistor, and a third resistor;

[0022] One end of the second energy storage device is connected to the output of the detection module, the second end of the second energy storage device is connected to the control end of the second switching tube, the first end of the second switching tube is connected to a second power supply, the second end of the second switching tube is grounded through the third resistor, the second end of the second switching tube is also connected to the first enable pin of the wake-up chip, and the second resistor is connected between the control end and the second end of the second switching tube;

[0023] The second switching tube is turned on based on the first detection signal to output the enable level, and after the second energy storage device is charged for a preset duration by the first power supply based on the first detection signal through the first resistor, the second switching tube is turned off to stop outputting the enable level.

[0024] In the technical solution of the embodiment of the present application, when the first switching tube is turned on, by using the principle that the voltage across both ends of a capacitor, such as the second energy storage device, does not change suddenly, the control end of the second switching tube presents a low level and is turned on to output the enable level. At the same time, the second power supply charges the second energy storage device, and when the voltage rises to turn off the second switching tube to stop outputting the enable level, by configuring a preset duration for the charging process of the second energy storage device, a certain time window can be provided for the second switching tube to be turned on, so as to output the enable level to enable the wake-up chip to start and wake up the BMS in the sleep state.

[0025] In some embodiments, the enable module further includes a third unidirectional conduction device, and the third unidirectional conduction device is connected in the forward direction between the second end of the second switching tube and the first enable pin of the wake-up chip. This avoids the intrusion of the voltages of other wake-up sources sharing the first enable pin of the wake-up chip and affecting the normal operation of the enable module.

[0026] In some embodiments, the control circuit includes one of the control chips in the BMS, and the self-locking pin of the control chip is connected to the second enable pin of the wake-up chip to provide the self-locking signal.

[0027] In the technical solution of the embodiment of the present application, the enable circuit and the control circuit are connected to different pins of the wake-up chip, so that the control of the enable level on the wake-up chip and the self-locking signal on the wake-up chip are independent of each other. In this way, the wake-up chip can be turned off after the self-locking signal is revoked to achieve sleep, thereby reducing the lead-acid consumption of the battery.

[0028] In some embodiments, the wake-up chip is a power supply chip for supplying power to the BMS, or a control chip for controlling the sleep or wake-up of the BMS.

[0029] In some embodiments, the first level signal includes a high-level signal and a PWM signal.

[0030] A power chip and a control chip that can be compatible with level triggering and / or edge triggering enable the BMS with level triggering and / or edge triggering to also achieve wake-up and sleep when a charging device is connected.

[0031] In some embodiments, the control circuit includes one of the control chips in the BMS, which is convenient for system settings.

[0032] In a second aspect, an embodiment of the present application provides a method for waking up and sleeping a BMS, including:

[0033] When a charging device is connected, generate an enabling level for a preset duration according to a first level signal provided by the charging device to enable a wake-up chip of the BMS to start and wake up the BMS;

[0034] Generate a self-locking signal within the preset duration to maintain the wake-up chip in the startup state;

[0035] If a sleep signal is received, stop outputting the self-locking signal to turn off the wake-up chip and make the BMS enter the sleep state.

[0036] In the technical solution of the embodiment of the present application, when the BMS is connected to a charging device, it can generate an enabling level for a preset duration through the first level signal provided by the charging device. The enabling level for the preset duration enables the wake-up chip to start and wake up the BMS, and the wake-up chip keeps the BMS awake by outputting a self-locking signal. Additionally, when the charging device remains unplugged, since the enabling level only lasts for the preset duration and then needs to enter the sleep state, the wake-up chip is turned off after canceling the self-locking signal, enabling the BMS to enter the sleep state, solving the problem in the related art that the BMS cannot enter the sleep state when the charging device is not unplugged. Moreover, since the generated enabling level will generate an edge signal, both edge-triggered and level-triggered wake-up chips can meet the requirement of being able to put the BMS to sleep while keeping the charging device connected, thereby reducing the lead-acid consumption of the battery.

[0037] In some embodiments, the first level signal includes a high-level signal and a PWM signal.

[0038] In the technical solution of the embodiment of the present application, the BMS can be compatible with level triggering and / or edge triggering, enabling the BMS with level triggering and / or edge triggering to also achieve wake-up and sleep when a charging device is connected.

[0039] In a third aspect, the present application provides a BMS including the above-mentioned BMS wake-up and sleep circuit.

[0040] In the technical solution of the embodiment of the present application, when a charging device is connected, the BMS can enable a wake-up chip to start for a period of time through a level signal provided by the charging device to wake up the BMS in a dormant state, and the awakened BMS keeps the wake-up chip starting by outputting a self-locking signal; in addition, when the charging device remains unplugged, since the enabling level only lasts for a preset duration, the BMS can enter the dormant state after canceling the self-locking signal when it needs to go dormant later, solving the problem that the BMS cannot enter the dormant state when the charging device is not unplugged, thereby reducing the lead-acid consumption of the battery.

[0041] Fourthly, the present application provides an electrical device, including a battery and the above-mentioned BMS.

[0042] In the technical solution of the embodiment of the present application, when a charging device is connected, the electrical device can enable a wake-up chip to start for a period of time through a level signal provided by the charging device to wake up the BMS in the dormant state of the electrical device, and the awakened BMS keeps the wake-up chip starting by outputting a self-locking signal; in addition, when the charging device remains unplugged, since the enabling level only lasts for a preset duration, the BMS can enter the dormant state after canceling the self-locking signal when it needs to go dormant later, solving the problem that the BMS cannot enter the dormant state when the charging device is not unplugged, thereby reducing the lead-acid consumption of the battery.

[0043] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are hereinafter specifically exemplified. Description of the Drawings

[0044] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0045] Figure 1 It is a module diagram of the BMS sleep wake-up circuit provided by some embodiments of the present application;

[0046] Figure 2 It is a module diagram of the BMS sleep wake-up circuit provided by some embodiments of the present application;

[0047] Figure 3 It is a circuit diagram of the BMS sleep wake-up circuit provided by some embodiments of the present application;

[0048] Figure 4 It is a flowchart of the BMS sleep wake-up method provided by some embodiments of the present application;

[0049] The reference numerals in the specific embodiments are as follows:

[0050] Charging device 10, communication interface 11, first detection port 110, second detection port 112, enabling circuit 120, detection module 122, enabling module 124, control circuit 130, sampling circuit 140, wake-up chip 200;

[0051] First switching transistor Q1, second switching transistor Q2, first energy storage device C1, second energy storage device C2, first resistor R1, second resistor R2, third resistor R3, discharge resistor R11, current limiting resistor R12, first enabling pin EN1, second enabling pin EN2, first unidirectional conductor D1, second unidirectional device D2, third unidirectional device D3, voltage regulator device Z1, first power supply V1, second power supply V2. Specific embodiments

[0052] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and therefore are only examples and cannot be used to limit the protection scope of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0054] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0055] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent three situations: A exists alone, both A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0057] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0058] In the description of the embodiments of the present application, for technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0060] For the charging wake-up function, the edge-effective wake-up function of the wake-up chip is often used in combination. However, at present, many application chips do not support edge wake-up. Based on this, the inventive concept of the present application is that the wake-up chip used for the charging wake-up function only needs to have a basic level wake-up function, and of course, it can also be compatible with the edge-effective wake-up function. Specifically, the embodiments of the present application mainly introduce an inventive concept of a BMS interface circuit for a charging device (such as a charging gun) with a high-level or pulse width modulation (PWM) signal input, which supports access to wake-up and also supports dormancy without unplugging. The wake-up channel of the wake-up chip (such as a power chip or other chips with wake-up functions) used only needs to have a level or edge wake-up function.

[0061] For example, in new energy electric vehicle products, a communication interface that supports a high-level input at the charging gun interface (such as the AC_CP interface, which provides a power transmission signal) can wake up the charging gun muzzle when the gun is inserted. Similarly, it also supports, under the control of the BMS, entering the sleep state without unplugging the gun while the charging gun remains inserted. After charging is completed or stopped, the BMS can enter the sleep state, saving energy consumption and reducing the loss of the lead-acid battery of the whole vehicle.

[0062] Please refer to Figure 1 , Figure 1 which is a module diagram of the BMS sleep wake-up circuit provided by some embodiments of this application. The BMS sleep wake-up circuit includes a first detection port 110, an enable circuit 120, and a control circuit 130.

[0063] The first detection port 110 is used to connect to the communication interface 11 of the charging device 10 when the charging device 10 is connected; the enable circuit 120 is connected to the first detection port 110 and the wake-up chip 200 of the BMS, and generates an enable level with a preset duration according to the first level signal provided by the charging device 10 to enable the wake-up chip 200 to start and wake up the BMS in the sleep state; the control circuit 130 is used to output a self-locking signal to the wake-up chip 200 to maintain the wake-up chip 200 in the start state after the BMS is woken up, and is also used to stop outputting the self-locking signal to turn off the wake-up chip 200 when receiving the sleep signal, so that the BMS enters the sleep state, solving the problem in the related art that the charging device 10 cannot enter the sleep state without unplugging the BMS, and reducing the lead-acid consumption of the battery.

[0064] The charging device 10 is, for example, a charging gun or a general charging adapter on the market. The communication interface 11 of the charging device 10 is, for example, the AC_CP interface of the charging gun or the communication interface of the charging adapter. Taking the charging gun as an example, after the charging gun is connected to the charging interface, the power transmission signal output to the charging interface through the communication interface 11 (i.e., the AC_CP interface) first enters the charging gun connection stage, and the first rising edge appears in this stage. After maintaining the high level for a preset duration, the power transmission signal enters the pulse change (i.e., PWM signal) stage of data communication. During the pulse change stage, the charging gun outputs the charging power to the charging interface. After charging is completed, the power transmission signal returns to the high level.

[0065] It can be understood that when the charging gun is connected, the first detection port 110 is connected to the communication interface 11 of the charging device 10 and receives the first level signal provided by the communication interface 11 of the charging device 10, such as a high level or a PWM signal. On the contrary, when the charging device 10 is not connected, the first detection port 110 is at a low level, which can also be the second level signal.

[0066] It can be understood that generating an enabling level will necessarily generate an edge signal. For example, if the enabling level with a preset duration generated by the enabling circuit 120 according to the first level signal is a high level, it must also include a rising edge and a falling edge. Then, the wake-up chip 200 of the BMS can be enabled to start with a high level or an edge. The control circuit 130 is a part of the BMS. When the dormant BMS is awakened, the control circuit 130 is started. Therefore, after the wake-up chip 200 is started, it will wake up the dormant BMS, and output a self-locking signal through the control circuit 130 to maintain the wake-up chip 200 in the start state, so that the wake-up chip 200 always wakes up the BMS to work, thus completing the wake-up process of the dormant BMS. It can be understood that to maintain the wake-up chip 200 in the start state, the self-locking signal should be generated within a preset duration.

[0067] After that, after a preset duration, for example, when charging is completed and aborted, if you want to reduce the lead-acid consumption of the battery, since the enabling level has stopped being output, you can directly stop the output of the self-locking signal, turn off the wake-up chip 200, and let the BMS enter the dormant state. This BMS wake-up and sleep control method can be applied to the wake-up chip 200 triggered by level and / or edge.

[0068] The enabling circuit 120 determines that the charging device 10 is connected by detecting the first level signal. When the charging device 10 is connected, it outputs an enabling level with a preset duration to enable the wake-up chip 200 to start and wake up the dormant BMS, and outputs a self-locking signal through the control circuit 130 to keep the wake-up chip 200 waking up the BMS; in addition, when the charging device 10 is not unplugged, since the enabling level only lasts for a preset duration, when it needs to enter the dormant state later, after canceling the self-locking signal, the wake-up chip 200 will be turned off, so that the BMS can enter the dormant state, solving the problem that the BMS cannot enter the dormant state when the charging device 10 is not unplugged. And because the generated enabling level will necessarily generate an edge signal, so whether it is an edge-triggered or level-triggered wake-up chip 200, it can meet the requirement of being able to put the BMS into sleep while keeping the charging device 10 connected, thereby reducing the lead-acid consumption of the battery.

[0069] In some embodiments, please refer to Figure 2 , Figure 2 which is a block diagram of the BMS sleep wake-up circuit provided by some embodiments of this application.

[0070] The enabling circuit 120 includes a detection module 122 and an enabling module 124. The detection module 122 is connected to the first detection port 110 and is configured to output a first detection signal according to the first level signal provided by the charging device 10; the enabling module 124 is connected to the detection module 122 and is configured to generate an enabling level for a preset duration according to the first detection signal. The enabling level is used to be output to the wake-up chip 200 of the BMS to enable the wake-up chip 200 to start, so as to wake up the BMS.

[0071] It can be understood that when the charging gun is unplugged, the detection module 122 is further configured to detect a second level signal (low level) and output a second detection signal (high level), and the enabling module 124 is further configured to receive the second detection signal and stop outputting the enabling level (high level or rising edge). At this time, a low level is output. For the wake-up chip 200 that is effective for a high level or rising edge, the low level cannot enable the start of the wake-up signal. This circuit design is simple and reliable.

[0072] In some embodiments, please refer to Figure 3 , Figure 3 is a circuit diagram of the BMS sleep wake-up circuit provided by some embodiments of the present application. The detection module 122 includes a first switching tube Q1 and a first resistor R1. The control end of the first switching tube Q1 is connected to the first detection port 110. The first end of the first switching tube Q1 is connected to the first power supply V1 through the first resistor R1. The second end of the first switching tube Q1 is connected to the ground. The first end of the first switching tube Q1 is connected to the enabling module 124. The first switching tube Q1 outputs a first detection signal under the drive of the first level signal.

[0073] Exemplarily, the first switching tube Q1 can be a semiconductor transistor that conducts when a high level is applied, such as an N-channel MOS transistor, an IGBT, etc. The control end, the first end, and the second end of the first switching tube Q1 are respectively the gate, the drain, and the source of the MOS transistor. When a first level signal (such as a high level signal) is input at the first detection port 110, the voltage Vb at the control end of the first switching tube Q1 presents a certain voltage, which is used to drive the switching action of the first switching tube Q1, so as to pull down the voltage Vc at the first end of the first switching tube Q1 to the ground, that is, output a first detection signal to the enabling module 124. This embodiment provides an implementation manner of the detection module 122, which has the advantages of simple circuit structure, reliability, and low cost.

[0074] In some embodiments, please refer to Figure 3, the detection module 122 further includes a first energy storage device C1 and a first unidirectional conduction device D1. The input end of the first unidirectional conduction device D1 is connected to the first detection port 110. The output end of the first unidirectional conduction device D1 is connected to one end of the first energy storage device C1 and the control end of the first switching transistor Q1. The other end of the first energy storage device C1 is grounded. The first energy storage device C1 is configured to store energy based on the first level signal to drive the first switching transistor Q1 to conduct.

[0075] Exemplarily, the first energy storage device C1 may be an energy storage capacitor, and the first unidirectional conduction device D1 may be a diode. When the first detection signal is, for example, a PWM signal, through energy storage and filtering by the first energy storage device C1, a certain stable level can be maintained at the control end of the first switching transistor Q1 above a certain frequency duty cycle of the PWM signal, so that the first switching transistor Q1 can conduct, output the first detection signal, and trigger the enabling module 124 to output an enabling level for a preset duration.

[0076] In addition, during the low level stage of the PWM signal, the first unidirectional conduction device D1 can prevent the voltage at the control end of the first switching transistor Q1 from being pulled down by the input, failing to provide the first detection signal for a sufficient duration, resulting in the enabling circuit 120 failing to enable the wake-up of the chip 200.

[0077] Optionally, a discharge resistor R11 is further connected in parallel with the first energy storage device C1. The discharge loop composed of the first energy storage device C1 and the discharge resistor R11 can keep the voltage Vb at the control end of the first switching transistor Q1 maintained under the input of a certain frequency duty cycle of the PWM signal, so as to be able to conduct the first switching transistor Q1 to provide the first detection signal.

[0078] In some embodiments, please refer to Figure 3 , the detection module 122 further includes a voltage regulator device Z1. The voltage regulator device Z1 is connected to the control end of the first switching transistor Q1 and is configured to stabilize the voltage at the control end of the first switching transistor Q1.

[0079] The voltage regulator device Z1, for example, uses a zener diode, whose cathode is connected to the control end of the first switching transistor Q1 and the anode is grounded. The zener diode can start to work when the voltage input to the control end of the first switching transistor Q1 is greater than a certain value, clamp the voltage Vb at the control end of the first switching transistor Q1 at a certain voltage value to protect the first switching transistor Q1 from being damaged. The maximum clamping voltage selected for the voltage regulator device Z1 should be less than the breakdown voltage from the control end to the second end of the first switching transistor Q1.

[0080] Optionally, a current limiting resistor R12 is connected between the cathode of the voltage regulator device Z1 and the cooperation protection resistor R11. The current limiting resistor R12 plays a role in current limiting in this loop. When the voltage regulator device Z1 is working, it can limit the loop current and protect the relevant components in the loop.

[0081] In some embodiments, the BMS wake-up sleep circuit further includes a second detection port 112 and a second unidirectional conduction device D2. The second unidirectional conduction device D2 is connected in the forward direction between the second detection port 112 and the control end of the first switching transistor Q1. The second detection port 112 can be used to access other wake-up source level signals or PWM signals, providing another channel for waking up and putting the BMS to sleep. The second unidirectional conduction device D2 can be a diode, which has a similar function to the above-mentioned first unidirectional conduction device D1.

[0082] In some embodiments, the enabling module 124 includes a second energy storage device C2, a second switching transistor Q2, a second resistor R2, and a third resistor R3. One end of the second energy storage device C2 is connected to the output of the detection module 122. The second end of the second energy storage device C2 is connected to the control end of the second switching transistor Q2. The first end of the second switching transistor Q2 is connected to a second power supply. The second end of the second switching transistor Q2 is grounded through the third resistor R3. The second end of the second switching transistor Q2 is also connected to the first enabling pin EN1 of the wake-up chip 200. The second resistor R2 is connected between the control end and the second end of the second switching transistor Q2. The second switching transistor Q2 conducts based on the first detection signal to output an enabling level. After the second energy storage device C2 is charged by the first power supply through the second resistor R2 for a preset duration based on the first detection signal, the second switching transistor Q2 is turned off to stop outputting the enabling level.

[0083] The second energy storage device C2 is, for example, a capacitor. The second switching transistor Q2 can be a semiconductor transistor that conducts when a low level is applied, such as a P-channel MOS transistor, IGBT, etc. The control end, the first end, and the second end of the second switching transistor Q2 are respectively the gate, the source, and the drain of the MOS transistor.

[0084] When the first switching transistor Q1 conducts, based on the principle that the voltage across the second energy storage device (capacitor) C2 does not change suddenly, the voltage Vd at the control end of the second switching transistor Q2 is pulled down to the ground and conducts, thereby outputting an enabling level (including a high-level signal and a rising-edge signal). At the same time, the second power supply V2 charges the second energy storage device C2. The voltage Vd at the control end of the second switching transistor Q2 rises to a level that turns off the second switching transistor Q2 to stop outputting the enabling level. By configuring a preset duration for the charging process of the second energy storage device C2, a certain time window can be opened for the second switching transistor Q2, so as to output an enabling level to enable the wake-up chip 200 to start and wake up the BMS in the sleep state.

[0085] In some embodiments, the enabling module 124 further includes a third unidirectional conduction device D3, which is connected in the forward direction between the second end of the second switching transistor Q2 and the first enabling pin EN1 of the wake-up chip 200. The third unidirectional conduction device D3 can be a diode, which can prevent the voltage of other wake-up sources sharing the first enabling pin EN1 of the wake-up chip 200, such as the controller of the BMS, from being coupled in and affecting the normal operation of the enabling module 124.

[0086] The first power supply V1 and the second power supply V2 can be common power supplies on the BMS board, generally 3.3V or 5V, or a level power supply adapted to the system.

[0087] In some embodiments, referring to Figure 3 , the control circuit 130 includes one of the control chips in the BMS, and the lock pin of the control chip is connected to the second enabling pin EN2 of the wake-up chip 200 to provide a self-locking signal.

[0088] The enabling circuit 120 and the control circuit 130 are connected to different enabling pins of the wake-up chip 200, so that the enabling level and the self-locking signal are independent of each other in controlling the wake-up chip 200. After startup, the wake-up chip 200 can be locked by the self-locking signal output by the controller, so that the wake-up chip 200 can be turned off after the self-locking signal is withdrawn to achieve dormancy, thereby reducing the lead-acid consumption of the battery.

[0089] In some embodiments, the wake-up chip 200 is a power supply chip for powering the BMS, or a control chip for controlling the dormancy or wake-up of the BMS.

[0090] It can be understood that the wake-up chip 200 is a component in the BMS. The external input high-level signal or rising-edge signal enables the wake-up chip 200 through the first enabling pin EN1, and then activates the entire BMS to start working. For example, a power supply chip with a level and / or rising-edge signal wake-up function outputs the required voltage for the subsequent stage when receiving an external level signal (such as a high level), so that the entire BMS starts working. For example, a control chip with a level and / or rising-edge signal wake-up function outputs a control signal for starting the power supply module when receiving an external level signal (such as a high level), so that the power supply module outputs the required voltage for the subsequent stage, so that the entire BMS starts working.

[0091] The BMS dormancy and wake-up circuit according to the embodiments of the present application can be compatible with power supply chips and control chips with level triggering and / or edge triggering, so that the BMS with level triggering and / or edge triggering can also realize the wake-up and dormancy when the charging device 10 is connected.

[0092] In some embodiments, the control circuit 130 and the wake-up chip 200 are the same control chip. During operation, after the control chip is enabled and started by receiving an enable level for a preset duration through the first enable pin EN1, it generates a self-locking signal for the second enable pin EN2 to maintain the working state. After the preset duration, the self-locking signal is revoked to turn off the wake-up chip 200 and put the BMS into sleep mode.

[0093] In some embodiments, refer to Figure 3 , the BMS sleep wake-up circuit further includes a sampling circuit 140 connected to the first detection port 110 and the control circuit 130. The sampling circuit 140 is configured to output a disconnection signal when it detects that the detection port 110 is not connected to the charging device 10.

[0094] Optionally, the sampling circuit 140 can also be connected to the second detection port 112. The sampling circuit 140 detects the access signal of the plugged-in charging gun (such as the AC_CP interface), identifies the level or PWM state, and is used for the identification of the wake-up source (such as the charging gun) or the charging state. The disconnection signal can be a level signal, which is not limited herein. The control circuit 130 can revoke the self-locking signal according to the disconnection signal, thereby turning off the wake-up chip 200 and putting the BMS into sleep mode.

[0095] In some embodiments, refer to Figure 3 , when the charging device 10 is not connected, that is Figure 1 that is, the AC_CP interface exemplified in the appendix Figure 1 is not connected. At this time, Va = Vb = 0V (that is, Vb < the gate-source threshold voltage Vgsth of Q1), the first switching transistor Q1 is in a cut-off and non-conducting state, the voltage across the capacitor of the second energy storage device C2 is stable, Vd = Ve = V2, the second switching transistor Q2 is in a cut-off and non-conducting state (that is, Vd - Ve > the Vgsth of Q2), and at this time Vg is at a low level, and the BMS in the sleep state is not awakened and activated.

[0096] When the charging gun is connected, that is, the appendix Figure 1As for the access of the AC_CP interface exemplified, due to the access of the high level (or PWM signal) of the charging interface, Vb = Va changes from low level to high level. (Due to the cut-off of the reverse current by the first unidirectional conduction device D1, and in cooperation with the large-capacitance first energy storage device C1 and the slow voltage discharge of the large-resistance discharge resistor R11, Va can also be maintained at a high level under the input of a PWM signal at a certain frequency). At this time, the first switching transistor Q1 conducts (Vb > Vgsth of Q1), and the Vc voltage is pulled down to 0V. Since the voltage across the two ends of the capacitor of the second energy storage device C2 cannot change suddenly (capacitor characteristic), Vd will also be pulled down to 0V (the recovery time from Vd to V2 is the charging time of the capacitor C2 through the third resistor R3). At this time, a certain voltage will appear across Vd-e, causing the second switching transistor Q2 to conduct (Vd - Ve < Vgsth of Q2). At this time, Vg rises from low level to high level, that is, the first enable pin EN1 of the corresponding wake-up chip 200 changes from low to high, triggering the level or edge wake-up function of the wake-up chip 200, activating the BMS in the sleep state to start working. The control circuit 130 (such as an MCU) that starts working outputs a self-locking signal to maintain the startup of the wake-up chip 200 to keep the BMS in the wake-up state.

[0097] While maintaining the charging gun connected, since the first switching transistor Q1 is always in the conducting state, the voltage across the two ends of the capacitor of the second energy storage device C2 will also return to a stable state, and the Vd voltage recovers, that is, Vd = Ve = V2. The second switching transistor Q2 also returns to the non-conducting cut-off state (that is, Vd - Ve > Vgsth of Q2), and Vg is at a low level. At this time, the control circuit 130 cancels the output self-locking signal, and the BMS can enter the sleep state.

[0098] Thus, a working process of wake-up and sleep functions for a charging interface with an external input of high level or PWM signal is completed.

[0099] In a second aspect, please refer to Figure 4 , Figure 4 which is a flowchart of the BMS sleep wake-up method provided by some embodiments of the present application, and in combination with Figures 1 to 3 . Some embodiments of the present application provide a BMS sleep wake-up method, including:

[0100] Step S110, when a charging device is connected, generate an enable level with a preset duration according to the first level signal provided by the charging device to enable the wake-up chip of the BMS to start and wake up the BMS;

[0101] Step S120, generate a self-locking signal within the preset duration to maintain the wake-up chip in the startup state;

[0102] Step S130, if a sleep signal is received, stop outputting the self-locking signal to turn off the wake-up chip, and put the BMS into sleep.

[0103] In the technical solution of the embodiment of the present application, when the charging device 10 is connected, the BMS can generate an enabling level through the first level signal provided by the charging device 10 to enable the wake-up chip 200 to start and wake up the BMS in the sleep state, and keep the wake-up chip 200 waking up the BMS by outputting a self-locking signal; in addition, when the charging device 10 remains unplugged, after the self-locking signal is revoked after a preset duration, the wake-up chip 200 will be turned off, so that the BMS can enter the sleep state, solving the problem in the related art that the BMS cannot enter the sleep state when the charging device 10 is not unplugged. Moreover, since the generated enabling level will generate an edge signal, the wake-up chip 200 that is triggered by either edge or level can meet the requirement of putting the BMS into sleep while keeping the charging device 10 connected, thereby reducing the lead-acid consumption of the battery.

[0104] In some embodiments, the first level signal includes a high level signal and a PWM signal.

[0105] In the technical solution of the embodiment of the present application, the BMS can be compatible with level triggering and / or edge triggering, so that the BMS with level triggering and / or edge triggering can also achieve wake-up and sleep when the charging device 10 is connected.

[0106] In a third aspect, please refer to Figure 3 This application provides a BMS, including the above-mentioned BMS sleep wake-up circuit.

[0107] In the technical solution of the embodiment of the present application, when the charging device 10 is connected, the BMS can generate an enabling level with a preset duration through the level signal provided by the charging device 10 to enable the wake-up chip 200 to start and wake up the BMS in the sleep state, and the woken-up BMS keeps the wake-up chip 200 starting by outputting a self-locking signal; in addition, when the charging device 10 remains unplugged, the BMS can enter the sleep state after the self-locking signal is revoked, solving the problem that the BMS cannot enter the sleep state when the charging device 10 is not unplugged, thereby reducing the lead-acid consumption of the battery.

[0108] In a fourth aspect, this application provides an electrical device, including a battery and the above-mentioned BMS.

[0109] The electrical device can be a new energy electric vehicle, a cleaning robot, an energy storage device, etc. In the technical solution of the embodiment of the present application, when the electrical device is connected to the charging device 10, an enabling level with a preset duration can be generated through the level signal provided by the charging device 10 to enable the wake-up chip 200 to start to wake up the BMS of the electrical device, and the woken-up BMS keeps the wake-up chip 200 started by outputting a self-locking signal; in addition, when the charging device 10 remains unplugged, the BMS can enter the sleep state after the self-locking signal is cancelled, solving the problem that the BMS cannot enter the sleep state when the charging device 10 is not unplugged, thereby reducing the lead-acid consumption of the battery.

[0110] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are given below.

[0111] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A BMS sleep wake-up circuit, characterized in that, it includes: A first detection port, which is used to connect to the communication interface of the charging device when the charging device is connected; An enabling circuit, connected to the first detection port and the wake-up chip of the BMS, is used to generate an enabling level with a preset duration according to the first level signal provided by the charging device to enable the wake-up chip to start and wake up the BMS in the sleep state when the charging device is connected; A control circuit is used to output a self-locking signal to the wake-up chip to maintain the wake-up chip in the startup state after the BMS is woken up, and is also used to stop outputting the self-locking signal to turn off the wake-up chip when receiving a sleep signal, so that the BMS enters the sleep state; The enabling circuit includes: A detection module, connected to the first detection port, is used to output a first detection signal according to the first level signal provided by the charging device; An enabling module, connected to the detection module, the enabling module is used to generate an enabling level with a preset duration according to the first detection signal and output it; The enabling module includes: a second energy storage device, a second switching tube, a second resistor and a third resistor; One end of the second energy storage device is connected to the output of the detection module, the second end of the second energy storage device is connected to the control end of the second switching tube, the first end of the second switching tube is connected to a second power supply, the second end of the second switching tube is grounded through the third resistor, the second end of the second switching tube is also connected to the first enabling pin of the wake-up chip, and the second resistor is connected between the control end and the second end of the second switching tube; The second switching tube conducts based on the first detection signal to output the enabling level, and after the second energy storage device is charged for a preset duration by the first power supply through the second resistor based on the first detection signal, the second switching tube is turned off to stop outputting the enabling level.

2. The BMS sleep wake-up circuit according to claim 1, characterized in that, The detection module includes a first switching tube and a first resistor, the control end of the first switching tube is connected to the first detection port, the first end of the first switching tube is connected to the first power supply through the first resistor, the second end of the first switching tube is grounded, the first end of the first switching tube is connected to the enabling module, and the first switching tube outputs the first detection signal under the drive of the first level signal.

3. The BMS sleep wake-up circuit according to claim 2, characterized in that, The detection module further includes a first energy storage device and a first unidirectional conduction device, the input end of the first unidirectional conduction device is connected to the first detection port, the output end of the first unidirectional conduction device is connected to one end of the first energy storage device and the control end of the first switching tube, the other end of the first energy storage device is grounded, and the first energy storage device is used to store energy based on the first level signal to drive the first switching tube to conduct.

4. The BMS sleep wake-up circuit according to claim 2, characterized in that, The detection module further includes a voltage regulator device, which is connected to the control end of the first switching tube for stabilizing the voltage at the control end of the first switching tube.

5. The BMS sleep and wake-up circuit according to claim 3, wherein, it further includes a second detection port and a second unidirectional conduction device, and the second unidirectional conduction device is connected in the forward direction between the second detection port and the control end of the first switching tube.

6. The BMS sleep and wake-up circuit according to claim 1, wherein, the enabling module further includes a third unidirectional conduction device, and the third unidirectional conduction device is connected in the forward direction between the second end of the second switching tube and the first enabling pin of the wake-up chip.

7. The BMS sleep and wake-up circuit according to claim 1, wherein, the control circuit includes one of the control chips in the BMS, and the self-locking pin of the control chip is connected to the second enabling pin of the wake-up chip to provide the self-locking signal.

8. The BMS sleep and wake-up circuit according to claim 1, wherein, the wake-up chip is a power chip for supplying power to the BMS or a control chip for controlling the sleep or wake-up of the BMS.

9. The BMS sleep and wake-up circuit according to claim 1, wherein, the first level signal includes a high-level signal and a PWM signal.

10. The BMS sleep and wake-up circuit according to claim 1, wherein, the control circuit and the wake-up chip are the same control chip.

11. A BMS sleep and wake-up method based on the BMS sleep and wake-up circuit according to any one of claims 1 to 10, wherein, it includes: when a charging device is connected, generating an enabling level for a preset duration according to the first level signal provided by the charging device to enable the wake-up chip of the BMS to start and wake up the BMS; generating a self-locking signal within the preset duration to maintain the wake-up chip in the starting state; if a sleep signal is received, stopping outputting the self-locking signal to turn off the wake-up chip and making the BMS enter the sleep state.

12. The BMS sleep and wake-up method according to claim 11, wherein, the first level signal includes a high-level signal and a PWM signal.

13. A BMS, wherein, it includes the BMS sleep and wake-up circuit according to any one of claims 1 to 10.

14. An electrical device including a battery, wherein, it further includes the BMS according to claim 13.

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