Low-voltage battery management system controller

Abstract

The utility model discloses a low-voltage battery management system controller, which comprises a power supply generation module, a driving module, a power module and a driving module control unit, the power module comprises a first power unit and a second power unit, the output end of the first power unit is connected with a discharging path, and the output end of the second power unit is connected with a charging path; the power supply generation module is respectively connected with a first driving unit and a second driving unit in the driving module; the first driving unit is connected with the first power unit, and the second driving unit is connected with the second power unit; and one end of the driving module control unit is connected with the discharging path, the other end is connected with the second driving unit, and the driving module control unit monitors the current of the discharging path in the sleep mode and controls the second driving unit to be started or stopped. According to the utility model, by adjusting the working state of the power module in the sleep mode, the low-power-consumption control of the access is realized, the standby time of the low-voltage battery is prolonged, the cost is reduced, and the flexibility is high.

Description

Technical Field

[0001] The utility model relates to the field of automobile batteries, in particular to a low-voltage battery management system controller. Background Art

[0002] The low-voltage battery management system controller is an electronic control unit specifically used to manage low-voltage batteries (generally referring to batteries with a voltage between 12V and 48V). It is used in a variety of scenarios, such as automotive low-voltage electrical systems and small energy storage systems, to accurately monitor, control and manage various battery parameters to ensure safe and efficient operation of the battery.

[0003] Currently, a dedicated chip is used to control the low-voltage battery management system, but this dedicated chip does not take low power consumption into consideration.

[0004] Therefore, the present invention aims to provide a low-voltage battery management system controller that does not rely on low-power chips and can reduce power consumption. Utility Model Content

[0005] The purpose of the utility model is to provide a low-voltage battery management system controller that can reduce power consumption and does not rely on low-power chips.

[0006] To achieve the above objectives, the present invention proposes a low-voltage battery management system controller, comprising: a power generation module, a drive module, a power module and a drive module control unit, wherein the drive module comprises a first drive unit and a second drive unit, and the power module comprises a first power unit and a second power unit;

[0007] The power supply generating module is respectively connected to the first driving unit and the second driving unit in the driving module to output a working voltage to the driving module;

[0008] The first driving unit is connected to the first power unit and outputs a first driving voltage to the first power unit to enable the first power unit to operate;

[0009] The second driving unit is connected to the second power unit and outputs a second driving voltage to the second power unit to enable the second power unit to operate;

[0010] The output end of the first power unit is connected to the discharge path of the low-voltage battery, and the output end of the second power unit is connected to the charging path of the low-voltage battery;

[0011] One end of the driving module control unit is connected to the discharge path, and the other end is connected to the second driving unit. The driving module control unit monitors the current size of the discharge path in sleep mode and controls the activation or deactivation of the second driving unit to control the on and off of the charging path.

[0012] Preferably, the charge and discharge path includes a discharge path and a charge path; the output end of the first power unit is connected to the discharge path to control the on and off of the discharge path; the output end of the second power unit is connected to the charge path to control the on and off of the charge path.

[0013] Preferably, the driving module control unit includes a current acquisition component, a current comparison component and a signal output component;

[0014] The current collecting component is provided in the discharge path to collect the current of the discharge path;

[0015] The current comparison component is connected to the current collection component to receive the current of the discharge path. The current comparison component also has a built-in current threshold for comparing the magnitude relationship between the current threshold and the current of the discharge path;

[0016] The signal output component has a first end and a second end, the first end is connected to the current comparison component, and the second end is connected to the second driving unit, and is used to control the activation or deactivation of the second driving unit according to the relationship between the current threshold and the current of the discharge path.

[0017] Preferably, the second end of the signal output component is connected between the second driving unit and the power supply generating module.

[0018] Preferably, the power supply generating module includes a first power supply generating unit and a second power supply generating unit, and the first power supply generating unit and the second power supply generating unit are both connected to the first driving unit and the second driving unit.

[0019] Preferably, it further comprises a mode judgment module, which is connected to the power supply generation module and switches the first power supply generation unit or the second power supply generation unit according to the working mode of the system.

[0020] Preferably, the operating mode of the system includes a working mode and the sleep mode.

[0021] Preferably, the first power unit includes a first NMOS, a gate of the first NMOS is connected to the first driving unit, and a source and a drain of the first NMOS are connected to the discharge path;

[0022] and / or,

[0023] The second power unit comprises a second NMOS, a gate of the second NMOS is connected with the second driving unit, and a source and a drain of the second NMOS are connected in the charging path.

[0024] Compared with the prior art, the technical scheme of the utility model has at least the following advantages and beneficial effects:

[0025] The low-voltage battery management system controller has the following advantages: the first driving unit and the second driving unit are arranged separately to drive the first power unit and the second power unit respectively, the driving module control unit is arranged to monitor the current size of the discharging path in the sleep mode, the second driving unit is started only when the current of the discharging path is too large, the charging path is enabled to work, the working state of the power module in the sleep mode is adjusted, the low-power consumption control of the charging path is realized, the standby time of the low-voltage battery is prolonged, the cost is reduced, and the flexibility is high. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 FIG. 1 is a structural schematic diagram of a low-voltage battery management system controller according to an embodiment of the utility model;

[0027] Figure 2 FIG. 4 is a schematic diagram of an NMOS tube used in the power unit in the embodiment. DETAILED DESCRIPTION

[0028] The technical scheme, structural features, achieved purposes and effects of the embodiment of the utility model will be described in detail below. Figures 1 and 2 The technical scheme, structural features, achieved purposes and effects of the embodiment of the utility model will be described in detail below.

[0029] It should be noted that the drawings are very simplified and use non-precise proportions, only to facilitate and clarify the purpose of assisting in the description of the embodiment of the utility model, and are not used to limit the technical conditions of the embodiment of the utility model, so they do not have technical substantive significance, any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0030] It should be noted that, in the present application, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or sequence between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes the elements listed explicitly, but also includes other elements not listed explicitly or inherent to such process, method, article or equipment.

[0031] The utility model discloses a low voltage battery management system controller can realize low power standby in hibernate mode, thereby prolonging the standby time of low voltage battery. Figure 1 As shown in the figure, the low voltage battery management system controller 1 of the embodiment includes a power supply generation module 10, a driving module, a power module and a driving module control unit 40.

[0032] The driving module includes a first driving unit 21 and a second driving unit 22, and the power supply generation module 10 is connected with the first driving unit 21 and the second driving unit 22 respectively to output working voltage to the first driving unit 21 and the second driving unit 22. The circuit of the first driving unit 21 and the second driving unit 22 can be built by discrete devices.

[0033] The power supply generation module 10 includes a first power supply generation unit 11 and a second power supply generation unit 12, and the first power supply generation unit 11 and the second power supply generation unit 12 are connected with the first driving unit 21 and the second driving unit 22. The first power supply generation unit 11 and the second power supply generation unit 12 can generate power supply of different voltage levels and different power consumption levels required inside the system, wherein the first power supply generation unit 11 is a high-power consumption power supply generation unit, the second power supply generation unit 12 is a low-power consumption power supply generation unit, and only one of the two works at the same time.

[0034] To reduce power consumption, the running mode of the system where the low voltage battery is located has a working mode (high power consumption mode) and a hibernate mode (low power consumption mode). In the working mode, the first power supply generation unit 11 works to provide higher voltage for the first driving unit 21 and the second driving unit 22. In the hibernate mode, the second power supply generation unit 12 works to provide lower voltage for the first driving unit 21 and the second driving unit 22, thereby achieving the purpose of reducing power consumption.

[0035] The specific structures of the first power generation unit 11 and the second power generation unit 12 can be various forms, for example, a combination of a Buck (DC-DC step-down converter chip), an LDO (low dropout linear regulator chip), and other chips. The first power generation unit 11 and the second power generation unit 12 are existing designs and will not be described in detail here.

[0036] The power module includes a first power unit 31 and a second power unit 32. The power module is connected to the charge and discharge path of the low-voltage battery (not shown in the figure). Specifically, the charge and discharge path includes a discharge path and a charge path. The output end of the first power unit 31 is connected to the discharge path to control the on / off of the discharge path; the output end of the second power unit 32 is connected to the charge path to control the on / off of the charge path, so that the power module can control the on / off of the charge and discharge paths. The power module is also connected to a drive module, wherein the first drive unit 21 is connected to the first power unit 31 and outputs a first drive voltage to the first power unit 31 to enable the first power unit 31 to operate; the second drive unit 22 is connected to the second power unit 32 and outputs a second drive voltage to the second power unit 32 to enable the second power unit 32 to operate.

[0037] In this embodiment, the first power unit 31 and the second power unit 32 mainly include NMOS transistors. Figure 2 As shown, the gate G of the NMOS transistor in the first power unit 31 is connected to the first drive unit 21, and the source S and drain D are connected to the discharge path. When the first drive voltage is applied to the gate G of the NMOS transistor in the first power unit 31, the NMOS transistor is turned on, thereby opening the discharge path and allowing the low-voltage battery to discharge externally. Similarly, the gate G of the NMOS transistor in the second power unit 32 is connected to the second drive unit 22, and the source S and drain D are connected to the charging path. When the second drive voltage is applied to the gate G of the NMOS transistor in the second power unit 32, the NMOS transistor is turned on, thereby opening the charging path and allowing the low-voltage battery to charge. The NMOS transistor has a body diode T1 with a forward conduction characteristic, which can prevent current from flowing in the opposite direction.

[0038] In other embodiments, the structures of the first power unit 31 and the second power unit 32 may be the same or different, and their specific circuit structures may also be in other forms.

[0039] In the working mode, the first power supply generating unit 11 works to provide a higher voltage to the first driving unit 21 and the second driving unit 22. At this time, the NMOS tubes of the first power unit 31 and the second power unit 32 are turned on at the same time, and both the charging path and the discharging path are working.

[0040] In the sleep mode, the second power supply generating unit 12 works to provide a lower voltage for the first driving unit 21 and the second driving unit 22. At this time, the discharge path corresponding to the first driving unit 21 is continuously turned on, and in an ideal case, the second driving unit 22 can be set to be not working due to low power consumption of the system, so that the charging path is not turned on, thereby reducing the power consumption in the sleep mode. However, in the sleep mode, the power consumption of the system can still increase due to external factors, at which time the charging path needs to be turned on, so that the complete path can withstand greater system power consumption, to ensure the safety of the path, and therefore the driving module control unit 40 is arranged in the embodiment to control whether the charging path is turned on or not in the sleep mode.

[0041] The second driving unit 22 is enabled or closed under the control of the driving module control unit 40, thereby controlling the turning on or off of the charging path. Specifically, one end of the driving module control unit 40 is connected with the discharge path to monitor the current size in the discharge path; the other end of the driving module control unit 40 is connected with the second driving unit 22, and the second driving unit 22 is controlled to be enabled or closed according to the current size in the discharge path.

[0042] The driving module control unit 40 only works in the sleep mode, and includes a current collecting component, a current comparing component and a signal output component. The current collecting component is arranged in the discharge path to collect the current size in the discharge path. The current comparing component is connected with the current collecting component to receive the current size in the discharge path, and is used to compare the size relationship between the current threshold and the current in the discharge path. The current threshold is built in the current comparing component, or can be introduced by external input. The current comparing component can be a comparator.

[0043] The signal output component has a first end and a second end, the first end is connected with the current comparing component, and the second end is connected with the second driving unit 22. The signal output component controls the second driving unit 22 to be enabled or closed according to the size relationship between the current threshold and the current in the discharge path. After the current comparing component outputs the size relationship between the current threshold and the current in the discharge path to the signal output component, if the current in the discharge path is greater than the current threshold, the signal output component enables the second driving unit 22, and if the current in the discharge path is less than the current threshold, the signal output component closes the second driving unit 22. The signal output component can have multiple ways to enable or close the second driving unit 22, for example, the second end is connected between the second driving unit 22 and the power supply generating module 10, when the current in the discharge path is greater than the current threshold, the second end connects the second driving unit 22 and the power supply generating module 10, and when the current in the discharge path is less than the current threshold, the second end disconnects the connection between the second driving unit 22 and the power supply generating module 10.

[0044] The driver module control unit 40 monitors the current in the discharge path during sleep mode. When the current in the discharge path is excessive, meaning the output of the low-voltage battery is excessive, the charging path is opened to complete the path, thereby absorbing greater system power consumption. Since the second driver unit 22 is inoperative when the current in the discharge path is low, and begins operating once the current in the discharge path exceeds a set threshold, low-power consumption control of the charging and discharging paths is achieved.

[0045] In this solution, the driving module control unit 40 can be connected to the second power supply generating unit 12 to control the driving module control unit 40 to operate only in the sleep mode. Alternatively, other mechanisms can be set to enable the driving module control unit 40 to operate only in the sleep mode.

[0046] In more embodiments, the device of the present invention also includes a mode judgment module, which is connected to the power supply generating module 10. The mode judgment module also monitors the system mode and enables the first power supply generating unit 11 or the second power supply generating unit 12 according to the system mode; when the system is in working mode, the first power supply generating unit 11 is enabled, and when the system is in sleep mode, the second power supply generating unit 12 is enabled.

[0047] In the present invention, regardless of whether the system is in operating mode or sleep mode, the first drive unit 21 continues to operate and continuously provides the first drive voltage to the first power unit 31, keeping the discharge path continuously conductive. The second drive unit 22 continues to operate in operating mode, but in sleep mode, whether to operate is determined based on the current size of the discharge path. The charging path will only be activated when the current in the discharge path is large. This configuration reduces the power consumption of the low-voltage battery in low-power mode and extends the standby time of the low-voltage battery.

[0048] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will be readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A low voltage battery management system controller, characterized in that: include: A power generation module, a driving module, a power module and a driving module control unit, wherein the driving module includes a first driving unit and a second driving unit, and the power module includes a first power unit and a second power unit; The power generation module is respectively connected to the first driving unit and the second driving unit in the driving module The drive unit is connected to output the operating voltage to the drive module; The first driving unit is connected to the first power unit and outputs a first driving voltage to the first power unit to enable the first power unit to operate; The second driving unit is connected to the second power unit and outputs a second driving voltage to the second power unit to enable the second power unit to operate; The output end of the first power unit is connected to the discharge path of the low-voltage battery, and the output end of the second power unit is connected to the charging path of the low-voltage battery; One end of the driving module control unit is connected to the discharge path, and the other end is connected to the second driving unit. The driving module control unit monitors the current size of the discharge path in sleep mode and controls the activation or deactivation of the second driving unit to control the on and off of the charging path.

2. The low-voltage battery management system controller according to claim 1, characterized in that: The driving module control unit includes a current acquisition component, a current comparison component and a signal output component; The current collecting component is provided in the discharge path to collect the current of the discharge path; The current comparison component is connected to the current collection component to receive the current of the discharge path. The current comparison component also has a built-in current threshold for comparing the magnitude relationship between the current threshold and the current of the discharge path; The signal output component has a first end and a second end, the first end is connected to the current comparison component, and the second end is connected to the second driving unit, and is used to control the activation or deactivation of the second driving unit according to the relationship between the current threshold and the current of the discharge path.

3. The low-voltage battery management system controller according to claim 2, characterized in that: The second end of the signal output component is connected between the second driving unit and the power supply generating module.

4. The low-voltage battery management system controller according to claim 1, wherein: The power generation module includes a first power generation unit and a second power generation unit, and the first power generation unit and the second power generation unit are both connected to the first driving unit and the second driving unit.

5. The low-voltage battery management system controller according to claim 4, characterized in that: It also includes a mode judgment module, which is connected to the power supply generation module. The mode judgment module switches the first power supply generation unit or the second power supply generation unit according to the working mode of the system.

6. The low-voltage battery management system controller according to claim 5, characterized in that: The operating mode of the system includes an operating mode and the sleep mode.

7. The low-voltage battery management system controller according to claim 1, wherein: The first power unit includes a first NMOS, a gate of the first NMOS is connected to the first driving unit, and a source and a drain of the first NMOS are connected to the discharge path; and / or, The second power unit includes a second NMOS, a gate of the second NMOS is connected to the second driving unit, and a source and a drain of the second NMOS are connected to the charging path.

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