Voltage sampling device, electronic equipment and vehicle

Abstract

The utility model relates to the technical field of voltage sampling, in particular to a voltage sampling device, electronic equipment and a vehicle. The voltage sampling device comprises a current detection module, a signal synchronization module and a voltage sampling module. The input end of the current detection module is connected with the output end of the battery charging device, the output end of the current detection module is connected with the input end of the signal synchronization module, the output end of the signal synchronization module is connected with the control end of the voltage sampling module, and the sampling end of the voltage sampling module is connected with the sampling end of the battery system. According to the utility model, the synchronism between the charging period and the voltage sampling period can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to voltage sampling technical field especially relates to a voltage sampling device, electronic equipment and vehicle. BACKGROUND

[0002] Multiple switches exist in the high-voltage loop of the battery system to ensure the power-on and safety cut-off of the high-voltage loop, voltage sampling is performed through the voltage sampling points arranged at both ends of the switches, and the voltage signals obtained through sampling are transmitted back to the microcontroller unit (MCU) through daisy chain communication.

[0003] However, when the battery charging device charges the battery system in a pulse manner, the cell voltage of the battery system will periodically fluctuate periodically, if the communication period during daisy chain communication cannot be synchronized with the charging period when the battery system is charged, the collected cell voltage may be always at a certain place of the periodic waveform, resulting in the inability to collect the highest voltage that the cell can reach, so that the full charging of the state of charge (SOC) of the battery cannot be determined and the cell cannot be correctly overvoltage monitored. SUMMARY

[0004] The utility model provides a voltage sampling device, electronic equipment and vehicle, and the main purpose is to improve the synchronism between the charging period and the voltage sampling period.

[0005] According to an aspect of the utility model, a voltage sampling device is provided, comprising: a current detection module, a signal synchronization module and a voltage sampling module; wherein,

[0006] The input end of the current detection module is connected with the output end of the battery charging device, the output end of the current detection module is connected with the input end of the signal synchronization module, the output end of the signal synchronization module is connected with the control end of the voltage sampling module, and the sampling end of the voltage sampling module is connected with the sampling end of the battery system.

[0007] Optionally, in an embodiment of the utility model, the current detection module comprises a current sampling submodule and a waveform detection submodule; wherein,

[0008] The output end of the battery charging device is connected with the first end of the current sampling submodule and the first input end of the waveform detection submodule respectively, the input end of the battery system is connected with the second end of the current sampling submodule and the second input end of the waveform detection submodule respectively, and the output end of the waveform detection submodule is connected with the input end of the signal synchronization module.

[0009] Optionally, in one embodiment of the present utility model, the current sampling submodule includes a current sampling resistor; wherein,

[0010] The output end of the battery charging device is connected to the first end of the current sampling resistor and the first input end of the waveform detection submodule respectively, and the input end of the battery system is connected to the second end of the current sampling resistor and the second input end of the waveform detection submodule respectively.

[0011] Optionally, in one embodiment of the present invention, the waveform detection submodule includes a comparator; wherein,

[0012] The output end of the battery charging device is connected to the first end of the current sampling submodule and the first input end of the comparator respectively, the input end of the battery system is connected to the second end of the current sampling submodule and the second input end of the comparator respectively, and the output end of the comparator is connected to the input end of the signal synchronization module.

[0013] Optionally, in one embodiment of the present invention, the signal synchronization module includes a control submodule; wherein,

[0014] The input end of the control submodule is connected to the output end of the current detection module, and the output end of the control submodule is connected to the control end of the voltage sampling module.

[0015] Optionally, in one embodiment of the present invention, the control submodule includes a micro control unit; wherein,

[0016] The input end of the micro control unit is connected to the output end of the current detection module, and the output end of the micro control unit is connected to the control end of the voltage sampling module.

[0017] Optionally, in one embodiment of the present invention, the output end of the signal synchronization module and the control end of the voltage sampling module are connected in a daisy chain communication manner via a serial peripheral interface.

[0018] According to another aspect of the present invention, an electronic device is provided, comprising: a battery charging device, a battery system, and a voltage sampling device as described in any one of the aforementioned aspects.

[0019] According to another aspect of the present invention, a vehicle is provided, comprising: a battery charging device, a battery system, and a voltage sampling device as described in any one of the aforementioned aspects.

[0020] Optionally, in one embodiment of the present invention, the battery charging device is a monopole vehicle-mounted charger.

[0021] In summary, the voltage sampling device, electronic device, and vehicle provided by the embodiments of the present invention use a current detection module to perform waveform detection on the charging current output by the battery charging device to obtain the charging cycle of the charging current, and use a signal synchronization module to control the voltage sampling module according to the charging cycle, thereby improving the synchronization between the charging cycle and the voltage sampling cycle, thereby improving the accuracy of voltage sampling.

[0022] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory and are not restrictive of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0024] Figure 1 A schematic structural diagram of a voltage sampling device provided by one embodiment of the present utility model;

[0025] Figure 2 A schematic diagram of a charging current waveform provided by an embodiment of the present utility model;

[0026] Figure 3 A schematic structural diagram of a voltage sampling device provided by another embodiment of the present invention;

[0027] Figure 4 The present invention provides a schematic structural diagram of a voltage sampling device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0028] Some embodiments of the present invention will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. Various changes, modifications and equivalents of the methods, devices and / or systems described herein will become apparent after understanding the present invention. For example, the order of operations described herein is merely an example and is not limited to those orders set forth herein, but can be changed as becomes apparent after understanding the present invention, except for operations that must be performed in a specific order. In addition, for clarity and brevity, descriptions of features known in the art may be omitted.

[0029] The embodiments described in the following examples of the present invention do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0030] The utility model will be described in detail below in combination with specific embodiments.

[0031] Figure 1 It is a structure schematic view of a voltage sampling device provided by the utility model. As shown in the figure, the voltage sampling device comprises a current detection module, a signal synchronization module and a voltage sampling module; wherein, Figure 1

[0032] The input end of the current detection module is connected with the output end of the battery charging device, the output end of the current detection module is connected with the input end of the signal synchronization module, the output end of the signal synchronization module is connected with the control end of the voltage sampling module, and the sampling end of the voltage sampling module is connected with the sampling end of the battery system.

[0033] According to some embodiments, the battery charging device is used for charging the battery system. The battery charging device may, for example, be a single-pole on-board charger (OBC).

[0034] In some embodiments, Figure 2 It is a waveform schematic view of a charging current provided by the utility model. As shown in the figure, the single-pole OBC generates a 100ms periodic charging current when charging the battery system. Figure 2

[0035] In some embodiments, the current detection module is used for waveform detection of the charging current during charging to obtain the charging period of the charging current.

[0036] In some embodiments, the signal synchronization module is used for controlling the voltage sampling module to perform voltage sampling according to the charging period, so as to synchronize the charging period and the voltage sampling period.

[0037] For example, when the frequency of the current waveform of the charging current deviates or jumps, the signal synchronization module can control the voltage sampling module to synchronously perform voltage sampling.

[0038] It should be noted that by adopting the current detection module to perform waveform detection on the charging current output by the battery charging device to obtain the charging period of the charging current, and by adopting the signal synchronization module to control the voltage sampling module according to the charging period, the synchronization between the charging period and the voltage sampling period can be improved, so that the accuracy of voltage sampling can be improved.

[0039] Optionally, Figure 3 It is a structure schematic view of a voltage sampling device provided by the utility model. As shown in the figure, the current detection module comprises a current sampling submodule and a waveform detection submodule; wherein, Figure 3

[0040] ​​​The output end of the battery charging device is respectively connected to the first end of the current sampling submodule and the first input end of the waveform detection submodule, the input end of the battery system is respectively connected to the second end of the current sampling submodule and the second input end of the waveform detection submodule, and the output end of the waveform detection submodule is connected to the input end of the signal synchronization module.

[0041] According to some embodiments, the current sampling submodule is used to sample the charging current during charging.

[0042] In some embodiments, Figure 4 This is a schematic diagram of the structure of a voltage sampling device provided by an embodiment of the present utility model. Figure 4 As shown, the current sampling submodule includes a current sampling resistor Shunt; wherein,

[0043] The output end of the battery charging device is connected to the first end of the current sampling resistor Shunt and the first input end of the waveform detection submodule respectively, and the input end of the battery system is connected to the second end of the current sampling resistor Shunt and the second input end of the waveform detection submodule respectively.

[0044] According to some embodiments, the waveform detection submodule is used to perform waveform detection on the sampled current signal to determine the waveform period of the current signal.

[0045] In some embodiments, as Figure 4 As shown, the waveform detection submodule includes a comparator; wherein,

[0046] The output end of the battery charging device is connected to the first end of the current sampling submodule and the first input end of the comparator respectively, the input end of the battery system is connected to the second end of the current sampling submodule and the second input end of the comparator respectively, and the output end of the comparator is connected to the input end of the signal synchronization module.

[0047] Take a scenario as an example, Figure 4 As shown, the unipolar OBC current sampled by the current sampling resistor Shunt can be converted into a synchronous square wave signal through the comparator.

[0048] Alternatively, as Figure 3 As shown, the signal synchronization module includes a control submodule; wherein,

[0049] The input end of the control submodule is connected to the output end of the current detection module, and the output end of the control submodule is connected to the control end of the voltage sampling module.

[0050] According to some embodiments, the control submodule can calibrate compensation for the synchronization between the charging period and the voltage sampling period, and control the voltage sampling module according to the voltage sampling period after the calibration compensation, so as to reduce the situation that the battery cell voltage at the correct time cannot be collected due to the period deviation between the charging period and the voltage sampling period (for example, the charging period is 90 ms and the voltage sampling period is 110 ms).

[0051] In some embodiments, the degree of synchronization between the charging period and the voltage sampling period can also be adjusted, so that the voltage sampling module can be controlled to sample the voltage at the target phase time of the charging period, and the flexibility of voltage sampling can be improved. The target phase time can be adjusted according to the actual application scenario.

[0052] According to some embodiments, as shown in Figure 4 , the control submodule includes an MCU; wherein,

[0053] The input end of the MCU is connected with the output end of the current detection module, and the output end of the MCU is connected with the control end of the voltage sampling module.

[0054] Optionally, the output end of the signal synchronization module and the control end of the voltage sampling module are connected in a daisy chain communication mode through a serial peripheral interface (SPI).

[0055] In some embodiments, the communication period of the daisy chain communication may, for example, be 100 ms, however, the collection time of the battery cell voltage in the communication timing of every 100 ms may be at the initial 10 ms or some other time, so that the collected battery cell voltage is always at some place of the periodic waveform (the worst is at the trough, and the expected is at the peak), which causes that the highest voltage that the battery cell can reach cannot be collected, and therefore, the two need to be periodically synchronized.

[0056] Optionally, as shown in Figure 4 , the voltage sampling module includes analog front end (AFE) chips AFEs, and the AFE chips AFEs and the MCU are connected in a daisy chain communication mode through an SPI.

[0057] In summary, the voltage sampling device provided in the embodiment of the present invention adopts a current detection module to perform waveform detection on the charging current output by the battery charging device to obtain the charging cycle of the charging current, and adopts a signal synchronization module to control the voltage sampling module according to the charging cycle, thereby solving the synchronization problem between the charging cycle and the voltage sampling cycle, and can sample the voltage value at the correct time when the frequency of the charging current deviates or jumps; secondly, it can obtain accurate single cell peak voltage, improve the accuracy of SOC full charge and overvoltage monitoring, and reduce the occurrence of overcharging or false full charge.

[0058] According to an embodiment of the present invention, the present invention further provides an electronic device.

[0059] The electronic device includes: a battery charging device, a battery system, and a voltage sampling device as shown in any of the above embodiments.

[0060] In summary, the electronic device provided by the embodiment of the present invention can improve the synchronization between the charging cycle and the voltage sampling cycle by using the above-mentioned voltage sampling device.

[0061] According to an embodiment of the present utility model, the present utility model also provides a vehicle.

[0062] The vehicle includes: a battery charging device, a battery system, and a voltage sampling device as shown in any of the above embodiments.

[0063] Optionally, the charging device may be a monopole on-board charger.

[0064] In summary, the electronic device provided by the embodiment of the present invention can improve the synchronization between the charging cycle and the voltage sampling cycle by using the above-mentioned voltage sampling device.

[0065] In the above detailed description, reference is made to the accompanying drawings, which illustrate specific aspects of the present invention that can be practiced. In this regard, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicating directions or expressing positional relationships may be used with reference to the orientation of the described figures. Since the components of the described devices can be positioned in a plurality of different orientations, directional terms can be used for illustrative purposes rather than restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concepts of the present invention. Therefore, the following detailed description should not be regarded as limiting.

[0066] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present inventions described herein may be combined with each other. As used herein, the term "and / or" includes any one of the relevant listed items and any combination of any two or more thereof; similarly, "at least one of" includes any one of the relevant listed items and any combination of any two or more thereof.

[0067] It should be understood that, unless otherwise expressly specified or limited, the terms "join," "attach," "install," "connect," "connect," "fix," etc. used in the embodiments of the present invention should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrated; they can be mechanically connected, electrically connected, or communicable with each other; they can be directly connected, or indirectly connected through an intermediate medium; they can be internal communication between two elements or an interactive relationship between two elements, unless otherwise expressly limited. For those skilled in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0068] In addition, the term "over" as used in reference to a component, element, or material layer being formed "over" or located "over" a surface may be used herein to mean that the component, element, or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements, or layers are disposed between the surface and the component, element, or material layer. However, the term "over" as used in reference to a component, element, or material layer being formed "over" or located "over" a surface may alternatively have a specific meaning: the component, element, or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, e.g., in direct contact with the surface.

[0069] Although terms such as "first", "second" and "third" may be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, part, region, layer or section from another component, part, region, layer or section. Therefore, without departing from the teachings of each example, the first component, part, region, layer or section mentioned in the examples described herein may also be referred to as the second component, part, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include at least one such feature. In the description herein, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0070] It should be understood that spatially relative terms such as "above," "upper," "below," and "lower" are used herein to describe the relationship of one element to another element shown in the figures. In addition to the orientation depicted in the figures, such spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as being "above" or "upper" relative to another element will be "below" or "lower" relative to the other element. Thus, the term "above" encompasses both above and below orientations, depending on the spatial orientation of the device. The device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

Claims

1. A voltage sampling device, characterized in that: include: Current detection module, signal synchronization module and voltage sampling module; among them, The input end of the current detection module is connected to the output end of the battery charging device, the output end of the current detection module is connected to the input end of the signal synchronization module, the output end of the signal synchronization module is connected to the control end of the voltage sampling module, and the sampling end of the voltage sampling module is connected to the sampling end of the battery system.

2. The voltage sampling device according to claim 1, characterized in that: The current detection module includes a current sampling submodule and a waveform detection submodule; wherein, The output end of the battery charging device is connected to the first end of the current sampling submodule and the first input end of the waveform detection submodule respectively, the input end of the battery system is connected to the second end of the current sampling submodule and the second input end of the waveform detection submodule respectively, and the output end of the waveform detection submodule is connected to the input end of the signal synchronization module.

3. The voltage sampling device according to claim 2, characterized in that: The current sampling submodule includes a current sampling resistor; wherein, The output end of the battery charging device is connected to the first end of the current sampling resistor and the first input end of the waveform detection submodule respectively, and the input end of the battery system is connected to the second end of the current sampling resistor and the second input end of the waveform detection submodule respectively.

4. The voltage sampling device according to claim 2, characterized in that: The waveform detection submodule includes a comparator; wherein, The output end of the battery charging device is connected to the first end of the current sampling submodule and the first input end of the comparator respectively, the input end of the battery system is connected to the second end of the current sampling submodule and the second input end of the comparator respectively, and the output end of the comparator is connected to the input end of the signal synchronization module.

5. The voltage sampling device according to claim 1, characterized in that: The signal synchronization module includes a control submodule; wherein, The input end of the control submodule is connected to the output end of the current detection module, and the output end of the control submodule is connected to the control end of the voltage sampling module.

6. The voltage sampling device according to claim 5, characterized in that: The control submodule includes a micro control unit; wherein, The input end of the micro control unit is connected to the output end of the current detection module, and the output end of the micro control unit is connected to the control end of the voltage sampling module.

7. The voltage sampling device according to claim 1, characterized in that: The output end of the signal synchronization module and the control end of the voltage sampling module are connected in a daisy chain communication manner via a serial peripheral interface.

8. An electronic device, characterized in that: include: A battery charging device, a battery system, and a voltage sampling device according to any one of claims 1 to 7.

9. A vehicle, characterized in that: include: A battery charging device, a battery system, and a voltage sampling device according to any one of claims 1 to 7.

10. The vehicle according to claim 9, characterized in that The battery charging device is a single-pole vehicle-mounted charger.

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