Current sampling circuit, vehicle power distribution framework and vehicle

Abstract

The application discloses a current sampling circuit, a vehicle power distribution architecture and a vehicle, a resistance shunt circuit is connected in series with a sampling loop, and a positive sampling pin and a negative sampling pin of a sampling calibration circuit are respectively connected with a first end and a second end of the resistance shunt circuit. In the sampling working mode, the sampling calibration circuit generates corresponding current sampling signals according to the voltage of the positive sampling pin and the voltage of the negative sampling pin of the sampling calibration circuit. In the calibration working mode, the positive sampling pin and the negative sampling pin of the sampling calibration circuit are electrically connected to the same side of the resistance shunt circuit through the calibration switch circuit, so that the voltage of the positive sampling pin and the voltage of the negative sampling pin of the sampling calibration circuit are consistent, and zero-drift calibration of the sampling calibration circuit is realized. Sampling points of zero drift calibration are located on the same side of the resistance shunt circuit, short circuit sampling cannot be carried out on the resistance shunt circuit, and the problem of circuit short circuit or switch burnout is avoided.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a current sampling circuit, a vehicle power distribution architecture, and a vehicle. Background Technology

[0002] Most current sampling circuits perform zero-drift calibration by sampling the current when the equipment is off the production line. This increases the workload of the production process and makes it impossible to cope with changes in the external environment of the equipment and the actual changes in the aging of the components and the equipment itself.

[0003] While related current sampling calibration techniques can cope with changes in the external environment of the equipment and the actual changes in the aging of the devices and the equipment itself, in practical applications, the sampling path may encounter high current scenarios, which may lead to the problem of the switching circuit burning out. Summary of the Invention

[0004] In view of the above problems, this application provides a current sampling circuit, a vehicle power distribution architecture, and a vehicle, aiming to solve the problem of high current scenarios in the sampling path in related technologies, which may cause the switching circuit to burn out.

[0005] The first aspect of this application provides a current sampling circuit, which includes: a resistor shunt circuit, a sampling calibration circuit, a calibration switch circuit, and a main control circuit;

[0006] A resistor shunt circuit is connected in series with the sampling circuit;

[0007] The positive and negative sampling pins of the sampling calibration circuit are connected to the first and second terminals of the resistor shunt circuit, respectively. In the sampling mode, the main control circuit controls the sampling calibration circuit to generate corresponding current sampling signals based on the voltage of its positive and negative sampling pins.

[0008] In calibration mode, the main control circuit controls the calibration switch circuit to electrically connect the positive and negative sampling pins of the sampling calibration circuit to the same side of the resistor shunt circuit.

[0009] In the technical solution of this application embodiment, a resistor shunt circuit is connected in series in the sampling circuit. The positive and negative sampling pins of the sampling calibration circuit are respectively connected to the first and second terminals of the resistor shunt circuit. In the sampling operation mode, the sampling calibration circuit generates a corresponding current sampling signal based on the voltage of its positive and negative sampling pins. In the calibration operation mode, the positive and negative sampling pins of the sampling calibration circuit are electrically connected to the same side of the resistor shunt circuit through a calibration switch circuit, so that the voltage of the positive and negative sampling pins of the sampling calibration circuit is consistent, realizing zero-drift calibration of the sampling calibration circuit. In this way, the sampling point of zero-drift calibration is located on the same side of the resistor shunt circuit, and short-circuit sampling of the resistor shunt circuit is avoided, thus avoiding the problems of short circuit or switch burnout.

[0010] In some embodiments, the first terminal of the resistor shunt circuit is connected to the negative sampling pin of the sampling calibration circuit via a calibration switch circuit;

[0011] The main control circuit is used to control the conduction of the calibration switch circuit in calibration working mode.

[0012] In the technical solution of this application embodiment, a resistor shunt circuit is connected in series in the sampling circuit. The positive and negative sampling pins of the sampling calibration circuit are respectively connected to the first and second terminals of the resistor shunt circuit. In the sampling mode, a corresponding current sampling signal is generated based on the voltage of the positive and negative sampling pins. In the calibration mode, the positive and negative sampling pins of the sampling calibration circuit are connected to the first terminal of the resistor shunt circuit via a calibration switch circuit. The voltages of the positive and negative sampling pins of the sampling calibration circuit are consistent, achieving zero-drift calibration of the sampling calibration circuit. Thus, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit, avoiding short-circuit sampling of the resistor shunt circuit and preventing problems such as short circuits or switch burnout.

[0013] In some embodiments, the second terminal of the resistor shunt circuit is connected to the positive sampling pin of the sampling calibration circuit via a calibration switch circuit;

[0014] The main control circuit is used to control the conduction of the calibration switch circuit in calibration working mode.

[0015] In the technical solution of this application embodiment, a resistor shunt circuit is connected in series in the sampling circuit. The positive and negative sampling pins of the sampling calibration circuit are respectively connected to the first and second terminals of the resistor shunt circuit. In the sampling mode, a corresponding current sampling signal is generated based on the voltage of the positive and negative sampling pins. In the calibration mode, the positive and negative sampling pins of the sampling calibration circuit are connected to the second terminal of the resistor shunt circuit via a calibration switch circuit. The voltages of the positive and negative sampling pins of the sampling calibration circuit are consistent, achieving zero-drift calibration of the sampling calibration circuit. Thus, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit, avoiding short-circuit sampling of the resistor shunt circuit and preventing problems such as short circuits or switch burnout.

[0016] In some embodiments, the main control circuit is used to control the calibration switch circuit to turn off in the sampling working mode.

[0017] In the technical solution of this application embodiment, in the sampling working mode, by controlling the calibration switch circuit to turn off, the calibration sampling terminal connected to the first or second terminal of the resistor shunt circuit can be disconnected from the positive or negative sampling pin of the sampling calibration circuit, thereby avoiding interference of the calibration sampling terminal to the sampling function of the sampling calibration circuit in the sampling working mode, and improving the reliability and stability of the sampling calibration circuit in current sampling.

[0018] In some embodiments, the main control circuit is also used to detect the temperature of the sampling calibration circuit, and to operate in calibration mode when the temperature difference of the sampling calibration circuit reaches a preset threshold temperature.

[0019] In the technical solution of this application embodiment, the main control circuit detects the temperature of the sampling calibration circuit. When the temperature difference of the sampling calibration circuit reaches a preset threshold temperature, it indicates that the environment of the sampling calibration circuit has changed significantly. At this time, the voltage of the positive sampling pin and the negative sampling pin of the sampling calibration circuit may not accurately represent the current flowing through the resistor shunt circuit after being processed by the sampling calibration circuit. By controlling the sampling calibration circuit to work in the calibration working mode, in the calibration working mode, the positive sampling pin and the negative sampling pin of the sampling calibration circuit are electrically connected to the same side of the resistor shunt circuit through the calibration switch circuit, so that the voltage of the positive sampling pin and the negative sampling pin of the sampling calibration circuit are consistent, realizing zero drift calibration of the sampling calibration circuit. In this way, the sampling point of zero drift calibration is located on the same side of the resistor shunt circuit, and the resistor shunt circuit will not be short-circuited for sampling, avoiding the problem of short circuit or switch burnout.

[0020] In some embodiments, the main control circuit is also used to operate in calibration mode when the temperature change rate of the sampling calibration circuit is greater than a preset temperature rise rate.

[0021] In the technical solution of this application embodiment, when the sampling calibration circuit experiences a large temperature change in a short period of time, it may experience a large sampling deviation due to changes in the external environment or the actual changes caused by the aging of the equipment itself. The main control circuit operates in calibration mode, and connects the positive and negative sampling pins of the sampling calibration circuit to the same side of the resistor shunt circuit through the calibration switch circuit. This ensures that the voltages of the positive and negative sampling pins of the sampling calibration circuit are consistent, achieving zero-drift calibration of the sampling calibration circuit. In this way, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit, avoiding short-circuit sampling of the resistor shunt circuit and preventing problems such as short circuits or switch burnout.

[0022] In some embodiments, the main control circuit is also used to alternate between sampling mode and calibration mode, and to control the calibration switch circuit to turn off in sampling mode.

[0023] In the technical solution of this application embodiment, under some unstable application environments, the sampling calibration circuit may frequently experience sampling deviations due to changes in the external environment or actual changes due to the aging of the equipment itself. In order to improve the accuracy of the sampling calibration circuit in current sampling, the main control circuit operates in calibration mode. The positive and negative sampling pins of the sampling calibration circuit are electrically connected to the same side of the resistor shunt circuit through the calibration switch circuit, so that the voltage of the positive and negative sampling pins of the sampling calibration circuit is consistent, realizing zero-drift calibration of the sampling calibration circuit. In this way, the sampling point of zero-drift calibration is located on the same side of the resistor shunt circuit, and the resistor shunt circuit will not be short-circuited for sampling, avoiding the problems of short circuit or switch burnout.

[0024] In some embodiments, the main control circuit operates in sampling mode for a longer period than it operates in calibration mode.

[0025] In the technical solution of this application embodiment, by controlling the main control circuit to operate in sampling mode for a longer period than in calibration mode, the sampling calibration circuit can perform zero-drift calibration once every certain sampling interval, avoiding the problem of excessive deviation in sampling results due to long-term deviation accumulation. Thus, even in harsh operating environments, the sampling calibration circuit can still accurately sample the current in the sampling loop, improving the accuracy and reliability of the sampling calibration circuit.

[0026] In some embodiments, the current sampling circuit further includes: a first sampling switch circuit, which is connected between the negative sampling pin of the sampling calibration circuit and the second terminal of the resistor shunt circuit;

[0027] The main control circuit is also used to control the first sampling switch circuit to turn on in the sampling working mode and to control the calibration switch circuit to turn off.

[0028] In the technical solution of this application embodiment, in the sampling working mode, by turning off the calibration switch circuit, the first sampling switch circuit is turned on. The positive sampling pin and the negative sampling pin of the sampling calibration circuit are respectively connected to the first end and the second end of the resistor shunt circuit. The sampling calibration circuit generates a corresponding current sampling signal according to the voltage of its positive sampling pin and the negative sampling pin, thereby realizing the current sampling of the sampling calibration circuit. It will not perform short-circuit sampling on the resistor shunt circuit, thus avoiding the problems of short circuit or burnt-out switch.

[0029] In some embodiments, the current sampling circuit further includes: a second sampling switch circuit, which is connected between the positive sampling pin of the sampling calibration circuit and the first terminal of the resistor shunt circuit;

[0030] The main control circuit is also used to control the second sampling switch circuit to turn on in the sampling working mode, and to control the calibration switch circuit to turn off.

[0031] In the technical solution of this application embodiment, in the sampling working mode, by turning off the calibration switch circuit and turning on the second sampling switch circuit, the positive sampling pin and the negative sampling pin of the sampling calibration circuit are respectively connected to the first end and the second end of the resistor shunt circuit. The sampling calibration circuit generates a corresponding current sampling signal according to the voltage of its positive sampling pin and the negative sampling pin, thereby realizing the current sampling of the sampling calibration circuit. It will not perform short-circuit sampling on the resistor shunt circuit, thus avoiding the problems of short circuit or switch burnout.

[0032] In some embodiments, the current sampling circuit further includes an auxiliary current sampling circuit;

[0033] The positive and negative sampling pins of the auxiliary current sampling circuit are connected to the first and second terminals of the resistor shunt circuit, respectively. The auxiliary current sampling circuit is used to generate an auxiliary sampling signal based on the voltage at the first and second terminals of the resistor shunt circuit.

[0034] In the technical solution of this application embodiment, by setting the positive sampling pin and negative sampling pin of the auxiliary current sampling circuit to be connected to the first and second terminals of the resistor shunt circuit respectively, when the sampling calibration circuit is working in the calibration mode, the auxiliary current sampling circuit generates an auxiliary sampling signal based on the voltage of the first and second terminals of the resistor shunt circuit. When the sampling calibration circuit is calibrating, the current sampling circuit uses the auxiliary sampling signal as the actual current sampling signal output. In this way, the problem of missing current sampling results during the calibration period can be avoided.

[0035] In some embodiments, the sampling accuracy of the auxiliary current sampling circuit is lower than that of the sampling calibration circuit.

[0036] In the technical solution of this application embodiment, by setting the sampling accuracy of the auxiliary current sampling circuit to be less than that of the sampling calibration circuit, the auxiliary current sampling circuit can sample the current of the sampling circuit to obtain an approximate current detection range, while the sampling calibration circuit can accurately sample the current of the sampling circuit. If the sampling result of the sampling calibration circuit deviates significantly from that of the auxiliary current sampling circuit, it indicates that the sampling accuracy of the sampling calibration circuit may be affected. At this time, the main control circuit operates in calibration mode, and the positive and negative sampling pins of the sampling calibration circuit are electrically connected to the same side of the resistor shunt circuit through the calibration switch circuit, so that the voltages of the positive and negative sampling pins of the sampling calibration circuit are consistent, thereby achieving zero-drift calibration of the sampling calibration circuit and improving the sampling accuracy of the current sampling circuit.

[0037] In some embodiments, the sampling calibration circuit and the auxiliary current sampling circuit are controlled by the main control circuit to alternately sample the current of the sampling loop.

[0038] In the technical solution of this application embodiment, the sampling calibration circuit and the auxiliary current sampling circuit can alternately sample the current of the sampling loop. The main control circuit can output the corresponding actual current sampling signal in real time according to the current sampling signal and the auxiliary sampling signal, avoiding sampling gaps within the sampling period. Furthermore, when there is a deviation between the voltage values ​​of the current sampling signal and the auxiliary sampling signal, if the deviation is too large, for example, if the difference between the voltage values ​​of the current sampling signal and the auxiliary sampling signal exceeds a preset voltage difference, the sampling calibration circuit is controlled to operate in calibration mode, improving the reliability and stability of the sampling calibration circuit in current sampling.

[0039] In some embodiments, the main control circuit is further configured to receive a current sampling signal and an auxiliary sampling signal, and select the one with the higher voltage value as the actual current sampling signal based on the voltage values ​​of the current sampling signal and the auxiliary sampling signal.

[0040] In the technical solution of this application embodiment, the sampling calibration circuit generates corresponding current sampling signals based on its positive and negative sampling pins in sampling mode. The positive and negative sampling pins of the auxiliary current sampling circuit are respectively connected to the first and second terminals of the resistor shunt circuit. The auxiliary current sampling circuit generates an auxiliary sampling signal based on the voltage at the first and second terminals of the resistor shunt circuit. When the voltage values ​​of the auxiliary sampling signal and the current sampling signal are different, the one with the higher voltage value is selected as the actual current sampling signal for output. In this way, a higher sampling value can be used for redundant overcurrent protection, avoiding the problem of component burnout due to missed large current sampling results in the event of inaccurate sampling.

[0041] In some embodiments, the main control circuit is also used to select an auxiliary sampling signal as the actual current sampling signal output when operating in calibration mode.

[0042] In the technical solution of this application embodiment, the positive sampling pin and negative sampling pin of the auxiliary current sampling circuit are respectively connected to the first and second terminals of the resistor shunt circuit. When the sampling calibration circuit is working in the calibration mode, the auxiliary current sampling circuit generates an auxiliary sampling signal based on the voltage of the first and second terminals of the resistor shunt circuit. When the sampling calibration circuit is calibrating, the current sampling circuit uses the auxiliary sampling signal as the actual current sampling signal output. In this way, the problem of missing current sampling results during the calibration period can be avoided.

[0043] A second aspect of this application also provides a vehicle power distribution architecture, including: a low-voltage battery, a current sampling circuit as described in any of the above embodiments, and a resistor shunt circuit connected in series with the low-voltage battery.

[0044] A third aspect of this application also provides a vehicle, including: a current sampling circuit as described in any of the above embodiments.

[0045] In the technical solution of this application embodiment, the vehicle includes a low-voltage battery. The low-voltage battery is connected to the positive or negative output terminal via a resistor shunt circuit in the current sampling circuit. This allows the resistor shunt circuit 200 to be connected in series in the main circuit of the low-voltage battery. In this case, the main circuit of the low-voltage battery serves as the sampling circuit. The positive and negative sampling pins of the sampling calibration circuit are connected to the first and second terminals of the resistor shunt circuit, respectively. In sampling mode, the sampling calibration circuit generates corresponding current sampling signals based on the voltages of its positive and negative sampling pins. In calibration mode, the positive and negative sampling pins of the sampling calibration circuit are electrically connected to the same side of the resistor shunt circuit via a calibration switch circuit. This ensures that the voltages of the positive and negative sampling pins of the sampling calibration circuit are consistent, achieving zero-drift calibration of the sampling calibration circuit. Thus, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit, preventing short-circuit sampling of the resistor shunt circuit and avoiding problems such as short circuits or switch burnout.

[0046] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0048] Figure 1 This is a schematic diagram of a first structure of the current sampling circuit provided in an embodiment of this application;

[0049] Figure 2 This is a schematic diagram of a second structure of the current sampling circuit provided in the embodiments of this application;

[0050] Figure 3 This is a schematic diagram of a third structure of the current sampling circuit provided in the embodiments of this application;

[0051] Figure 4 This is a schematic diagram of the fourth structure of the current sampling circuit provided in the embodiments of this application;

[0052] Figure 5 A schematic diagram of a fifth structure of the current sampling circuit provided in the embodiments of this application;

[0053] Figure 6 A sixth structural schematic diagram of the current sampling circuit provided in the embodiments of this application;

[0054] Figure 7 This is a schematic diagram of the vehicle power distribution architecture provided in an embodiment of this application. Detailed Implementation

[0055] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0057] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0058] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The phrase "second connection port" at various locations in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0059] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0060] In the description of the embodiments of this application, the term "multiple frames" refers to two or more (including two).

[0061] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0062] While related current sampling calibration techniques can cope with changes in the external environment of the equipment and the actual changes in the aging of the devices and the equipment itself, in practical applications, the sampling path may encounter high current scenarios, which may lead to the problem of the switching circuit burning out.

[0063] To address the aforementioned technical problems, this application provides a current sampling circuit, see [link to relevant documentation]. Figure 1As shown, the current sampling circuit in this embodiment includes: a resistor shunt circuit 200, a sampling calibration circuit 400, a calibration switch circuit 300, and a main control circuit 500. The resistor shunt circuit 200 is connected in series with the sampling loop 100. The positive and negative sampling pins of the sampling calibration circuit 400 are respectively connected to the first and second terminals of the resistor shunt circuit 200. The voltage across the resistor shunt circuit 200 is directly proportional to the current flowing through it. In sampling mode, the main control circuit 500 controls the sampling calibration circuit 400 to generate corresponding current sampling signals based on the voltages of its positive and negative sampling pins. In calibration mode, the main control circuit 500 controls the calibration switch circuit 300 to electrically connect the positive and negative sampling pins of the sampling calibration circuit 400 to the same side of the resistor shunt circuit 200.

[0064] In this embodiment, a resistor shunt circuit 200 is connected in series with the sampling circuit 100. The positive and negative sampling pins of the sampling calibration circuit 400 are connected to the first and second terminals of the resistor shunt circuit 200, respectively. In the sampling mode, the sampling calibration circuit 400 generates a corresponding current sampling signal based on the voltage of its positive and negative sampling pins. In the calibration mode, the positive and negative sampling pins of the sampling calibration circuit 400 are electrically connected to the same side of the resistor shunt circuit 200 via the calibration switch circuit 300, making the voltage of the positive and negative sampling pins of the sampling calibration circuit 400 consistent, thus achieving zero-drift calibration of the sampling calibration circuit 400. In this way, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit 200, preventing short-circuit sampling of the resistor shunt circuit 200 and avoiding problems such as short circuits or switch burnout.

[0065] In some embodiments, the sampling circuit 100 can be the main circuit of the low-voltage battery 700, the current sampling circuit can sample the current of the main circuit of the low-voltage battery 700, and the resistor shunt circuit 200 is connected in series in the main circuit of the low-voltage battery 700.

[0066] In some embodiments, the resistor shunt circuit 200 may include one or more sampling resistors. The positive sampling pin and the negative sampling pin of the sampling calibration circuit 400 are respectively connected to the two ends of the sampling resistor. The voltage across the sampling resistor is directly proportional to the current flowing through the sampling resistor, and the voltage across the sampling resistor is converted into a corresponding current sampling signal.

[0067] In some embodiments, the sampling calibration circuit 400 may be an operational amplifier.

[0068] In some embodiments, see Figure 2As shown, the first end of the resistor shunt circuit 200 is connected to the negative sampling pin of the sampling calibration circuit 400 via the calibration switch circuit 300; the main control circuit 500 is used to control the calibration switch circuit 300 to conduct in the calibration working mode.

[0069] In this embodiment, a resistor shunt circuit 200 is connected in series with the sampling circuit 100. The positive and negative sampling pins of the sampling calibration circuit 400 are connected to the first and second terminals of the resistor shunt circuit 200, respectively. In sampling mode, a corresponding current sampling signal is generated based on the voltage of the positive and negative sampling pins. In calibration mode, the positive and negative sampling pins of the sampling calibration circuit 400 are connected to the first terminal of the resistor shunt circuit 200 via a calibration switch circuit 300. The voltages of the positive and negative sampling pins of the sampling calibration circuit 400 are consistent, achieving zero-drift calibration of the sampling calibration circuit 400. Thus, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit 200, preventing short-circuit sampling of the resistor shunt circuit 200 and avoiding problems such as short circuits or switch burnout.

[0070] In some embodiments, see Figure 3 As shown, the second end of the resistor shunt circuit 200 is connected to the positive sampling pin of the sampling calibration circuit 400 via the calibration switch circuit 300; the main control circuit 500 is used to control the calibration switch circuit 300 to conduct in the calibration working mode.

[0071] In this embodiment, a resistor shunt circuit 200 is connected in series with the sampling circuit 100. The positive and negative sampling pins of the sampling calibration circuit 400 are connected to the first and second terminals of the resistor shunt circuit 200, respectively. In sampling mode, a corresponding current sampling signal is generated based on the voltage of the positive and negative sampling pins. In calibration mode, the positive and negative sampling pins of the sampling calibration circuit 400 are connected to the second terminal of the resistor shunt circuit 200 via a calibration switch circuit 300. The voltages of the positive and negative sampling pins of the sampling calibration circuit 400 are consistent, achieving zero-drift calibration of the sampling calibration circuit 400. Thus, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit 200, preventing short-circuit sampling of the resistor shunt circuit 200 and avoiding problems such as short circuits or switch burnout.

[0072] In some embodiments, the main control circuit 500 is used to control the calibration switch circuit 300 to turn off in the sampling working mode.

[0073] In this embodiment, in the sampling working mode, by controlling the calibration switch circuit 300 to turn off, the calibration sampling terminal connected to the first or second terminal of the resistor shunt circuit 200 can be disconnected from the positive or negative sampling pin of the sampling calibration circuit 400. This avoids the calibration sampling terminal interfering with the sampling function of the sampling calibration circuit 400 in the sampling working mode, and improves the reliability and stability of the sampling calibration circuit 400 in current sampling.

[0074] In some embodiments, the main control circuit 500 is also used to detect the temperature of the sampling calibration circuit 400, and to operate in calibration mode when the temperature difference of the sampling calibration circuit 400 reaches a preset threshold temperature.

[0075] In this embodiment, the main control circuit 500 detects the temperature of the sampling calibration circuit 400. When the temperature difference of the sampling calibration circuit 400 reaches a preset threshold temperature, it indicates that the environment of the sampling calibration circuit 400 has changed significantly. At this time, the voltage of the positive and negative sampling pins of the sampling calibration circuit 400 may not accurately represent the current flowing through the resistor shunt circuit 200 after being processed by the sampling calibration circuit 400. By controlling the sampling calibration circuit 400 to work in calibration mode, in calibration mode, the positive and negative sampling pins of the sampling calibration circuit 400 are electrically connected to the same side of the resistor shunt circuit 200 through the calibration switch circuit 300, so that the voltage of the positive and negative sampling pins of the sampling calibration circuit 400 is consistent, realizing zero-drift calibration of the sampling calibration circuit 400. In this way, the sampling point of zero-drift calibration is located on the same side of the resistor shunt circuit 200, and the resistor shunt circuit 200 will not be short-circuited, avoiding the problem of short circuit or switch burnout.

[0076] In some embodiments, the main control circuit 500 is also used to operate in calibration mode when the temperature change rate of the sampling calibration circuit 400 is greater than a preset temperature rise rate.

[0077] In this embodiment, when the sampling calibration circuit 400 experiences a large temperature change within a short period, it may experience a significant sampling deviation due to changes in the external environment or the actual aging of the equipment itself. The main control circuit 500 operates in calibration mode, connecting the positive and negative sampling pins of the sampling calibration circuit 400 to the same side of the resistor shunt circuit 200 via the calibration switch circuit 300. This ensures that the voltages of the positive and negative sampling pins of the sampling calibration circuit 400 are consistent, achieving zero-drift calibration of the sampling calibration circuit 400. Thus, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit 200, preventing short-circuit sampling of the resistor shunt circuit 200 and avoiding problems such as short circuits or switch burnout.

[0078] In some embodiments, the main control circuit 500 is also used to alternate between sampling mode and calibration mode, and to control the calibration switch circuit 300 to turn off in sampling mode.

[0079] In this embodiment, under unstable application environments, the sampling calibration circuit 400 may frequently experience sampling deviations due to changes in the external environment or the actual changes caused by the aging of the equipment itself. In order to improve the accuracy of current sampling by the sampling calibration circuit 400, the main control circuit 500 operates in calibration mode. Through the calibration switch circuit 300, the positive and negative sampling pins of the sampling calibration circuit 400 are electrically connected to the same side of the resistor shunt circuit 200, so that the voltage of the positive and negative sampling pins of the sampling calibration circuit 400 is consistent, thereby achieving zero-drift calibration of the sampling calibration circuit 400. In this way, the sampling point of zero-drift calibration is located on the same side of the resistor shunt circuit 200, and the resistor shunt circuit 200 will not be short-circuited for sampling, thus avoiding the problems of short circuit or switch burnout.

[0080] In some embodiments, the main control circuit 500 operates in sampling mode for a longer period than it operates in calibration mode.

[0081] In this embodiment, by controlling the main control circuit 500 to operate in sampling mode for a longer period than in calibration mode, the sampling calibration circuit 400 can perform zero-drift calibration at regular intervals during sampling, avoiding excessive deviation in sampling results due to long-term accumulation of bias. This allows the sampling calibration circuit 400 to accurately sample the current in the sampling loop 100 even in harsh operating environments, improving the accuracy and reliability of its sampling.

[0082] In some embodiments, see Figure 4As shown, the current sampling circuit also includes: a first sampling switch circuit 610, which is connected between the negative sampling pin of the sampling calibration circuit 400 and the second end of the resistor shunt circuit 200; the main control circuit 500 is also used to control the sampling switch circuit to be turned on in the sampling working mode and to control the calibration switch circuit 300 to be turned off.

[0083] In this embodiment, in the sampling working mode, by turning off the calibration switch circuit 300, the first sampling switch circuit 610 is turned on. The positive sampling pin and the negative sampling pin of the sampling calibration circuit 400 are respectively connected to the first and second terminals of the resistor shunt circuit 200. The sampling calibration circuit 400 generates a corresponding current sampling signal according to the voltage of its positive sampling pin and the negative sampling pin, thereby realizing the current sampling of the sampling calibration circuit 400. It will not perform short-circuit sampling on the resistor shunt circuit 200, thus avoiding the problem of short circuit or switch burnout.

[0084] In some embodiments, see Figure 5 As shown, the current sampling circuit also includes: a second sampling switch circuit 620, which is connected between the positive sampling pin of the sampling calibration circuit 400 and the first end of the resistor shunt circuit 200; the main control circuit 500 is also used to control the sampling switch circuit to be turned on in the sampling working mode and to control the calibration switch circuit 300 to be turned off.

[0085] In this embodiment, in the sampling working mode, by turning off the calibration switch circuit 300 and turning on the second sampling switch circuit 620, the positive sampling pin and negative sampling pin of the sampling calibration circuit 400 are respectively connected to the first and second terminals of the resistor shunt circuit 200. The sampling calibration circuit 400 generates a corresponding current sampling signal based on the voltage of its positive sampling pin and negative sampling pin, thereby realizing the current sampling of the sampling calibration circuit 400. This avoids short-circuit sampling of the resistor shunt circuit 200, thus preventing the problem of short circuit or switch burnout.

[0086] In some embodiments, see Figure 6 As shown, the current sampling circuit also includes an auxiliary current sampling circuit 800; the positive sampling pin and the negative sampling pin of the auxiliary current sampling circuit 800 are respectively connected to the first end and the second end of the resistor shunt circuit 200, and the auxiliary current sampling circuit 800 is used to generate an auxiliary sampling signal based on the voltage of the first end and the second end of the resistor shunt circuit 200.

[0087] In this embodiment, by setting the positive sampling pin and negative sampling pin of the auxiliary current sampling circuit 800 to be connected to the first and second terminals of the resistor shunt circuit 200 respectively, when the sampling calibration circuit 400 is working in calibration mode, the auxiliary current sampling circuit 800 generates an auxiliary sampling signal based on the voltage of the first and second terminals of the resistor shunt circuit 200. When the sampling calibration circuit 400 is calibrating, the current sampling circuit 800 uses the auxiliary sampling signal as the actual current sampling signal output. In this way, the problem of missing current sampling results during calibration can be avoided.

[0088] In some embodiments, the sampling accuracy of the auxiliary current sampling circuit 800 is less than that of the sampling calibration circuit 400.

[0089] In this embodiment, by setting the sampling accuracy of the auxiliary current sampling circuit 800 to be less than that of the sampling calibration circuit 400, the auxiliary current sampling circuit 800 can sample the current of the sampling loop 100 to obtain an approximate current detection range, while the sampling calibration circuit 400 can accurately sample the current of the sampling loop 100. If the sampling result of the sampling calibration circuit 400 deviates significantly from that of the auxiliary current sampling circuit 800, it indicates that the sampling accuracy of the sampling calibration circuit 400 may be affected. At this time, the main control circuit 500 operates in calibration mode, and the positive and negative sampling pins of the sampling calibration circuit 400 are electrically connected to the same side of the resistor shunt circuit 200 through the calibration switch circuit 300, so that the voltages of the positive and negative sampling pins of the sampling calibration circuit 400 are consistent, thereby achieving zero-drift calibration of the sampling calibration circuit 400 and improving the sampling accuracy of the current sampling circuit.

[0090] In some embodiments, the sampling calibration circuit 400 and the auxiliary current sampling circuit 800 are controlled by the main control circuit 500 to alternately sample the current of the sampling circuit 100.

[0091] In this embodiment, the sampling calibration circuit 400 and the auxiliary current sampling circuit 800 can alternately sample the current of the sampling loop 100. The main control circuit 500 can output the corresponding actual current sampling signal in real time according to the current sampling signal and the auxiliary sampling signal, avoiding sampling gaps within the sampling period. Furthermore, when there is a deviation between the voltage values ​​of the current sampling signal and the auxiliary sampling signal, if the deviation is too large, for example, if the difference between the voltage values ​​of the current sampling signal and the auxiliary sampling signal exceeds a preset voltage difference, the sampling calibration circuit 400 is controlled to operate in calibration mode, improving the reliability and stability of the current sampling performed by the sampling calibration circuit 400.

[0092] In some embodiments, the main control circuit 500 is further configured to receive a current sampling signal and an auxiliary sampling signal, and select the one with the higher voltage value as the actual current sampling signal based on the voltage values ​​of the current sampling signal and the auxiliary sampling signal.

[0093] In this embodiment, the sampling calibration circuit 400 generates corresponding current sampling signals based on its positive and negative sampling pins in sampling mode. The positive and negative sampling pins of the auxiliary current sampling circuit 800 are connected to the first and second terminals of the resistor shunt circuit 200, respectively. The auxiliary current sampling circuit 800 generates an auxiliary sampling signal based on the voltage between the first and second terminals of the resistor shunt circuit 200. When the voltage values ​​of the auxiliary sampling signal and the current sampling signal are different, the one with the higher voltage value is selected as the actual current sampling signal for output. In this way, a higher sampling value can be used for redundant overcurrent protection, avoiding the problem of component burnout due to missed large current sampling results in the event of inaccurate sampling.

[0094] In some embodiments, the main control circuit 500 is also configured to select an auxiliary sampling signal as the actual current sampling signal output when operating in calibration mode.

[0095] In this embodiment, the positive and negative sampling pins of the auxiliary current sampling circuit 800 are connected to the first and second terminals of the resistor shunt circuit 200, respectively. When the sampling calibration circuit 400 is in calibration mode, the auxiliary current sampling circuit generates an auxiliary sampling signal based on the voltage of the first and second terminals of the resistor shunt circuit 200. When the sampling calibration circuit 400 is calibrating, the current sampling circuit uses the auxiliary sampling signal as the actual current sampling signal output. In this way, the problem of missing current sampling results during calibration can be avoided.

[0096] This application also provides a vehicle power distribution architecture, see [link to relevant documentation] Figure 7 As shown, the vehicle power distribution architecture includes: a low-voltage battery 700, a current sampling circuit as described in any of the above embodiments, and a resistor shunt circuit 200 connected in series with the low-voltage battery 700.

[0097] In this embodiment, the sampling circuit 100 can be the main circuit of the low-voltage battery 700, which is connected to the positive or negative output terminal via the resistor shunt circuit 200.

[0098] In some embodiments, the sampling calibration circuit 400, the calibration switch circuit 300, and the main control circuit 500 can be integrated into the AFE chip.

[0099] This application also provides a vehicle, including a current sampling circuit as described in any of the above embodiments.

[0100] In this embodiment, the vehicle includes a low-voltage battery 700. The low-voltage battery 700 is connected to the positive or negative output terminal via a resistor shunt circuit 200 in the current sampling circuit. In this way, the resistor shunt circuit 200 can be connected in series in the main circuit of the low-voltage battery 700. At this time, the main circuit of the low-voltage battery 700 serves as the sampling circuit 100. The positive and negative sampling pins of the sampling calibration circuit 400 are respectively connected to the first and second terminals of the resistor shunt circuit 200. In the sampling working mode, the sampling calibration circuit 400 generates a corresponding current sampling signal based on the voltage of its positive and negative sampling pins. In calibration mode, the positive and negative sampling pins of the sampling calibration circuit 400 are electrically connected to the same side of the resistor shunt circuit 200 via the calibration switch circuit 300. This ensures that the voltages of the positive and negative sampling pins of the sampling calibration circuit 400 are consistent, achieving zero-drift calibration of the sampling calibration circuit 400. In this way, the sampling point for zero-drift calibration is located on the same side of the resistor shunt circuit 200, preventing short-circuit sampling of the resistor shunt circuit 200 and avoiding problems such as short circuits or burnt-out switches.

[0101] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0102] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0103] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the electronic device embodiments described above are merely illustrative. For example, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.

[0104] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0105] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0106] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A current sampling circuit, characterized in that, The current sampling circuit includes: a resistor shunt circuit, a sampling calibration circuit, a calibration switch circuit, and a main control circuit; The resistor shunt circuit is connected in series with the sampling circuit; The positive and negative sampling pins of the sampling calibration circuit are connected to the first and second terminals of the resistor shunt circuit, respectively. In the sampling mode, the main control circuit controls the sampling calibration circuit to generate a corresponding current sampling signal based on the voltage of its positive and negative sampling pins. In calibration mode, the main control circuit controls the calibration switch circuit to electrically connect the positive and negative sampling pins of the sampling calibration circuit to the same side of the resistor shunt circuit.

2. The current sampling circuit as described in claim 1, characterized in that, The first terminal of the resistor shunt circuit is connected to the negative sampling pin of the sampling calibration circuit via the calibration switch circuit; The main control circuit is used to control the calibration switch circuit to be turned on in calibration working mode.

3. The current sampling circuit as described in claim 1, characterized in that, The second terminal of the resistor shunt circuit is connected to the positive sampling pin of the sampling calibration circuit via the calibration switch circuit; The main control circuit is used to control the calibration switch circuit to be turned on in calibration working mode.

4. The current sampling circuit as described in claim 2 or 3, characterized in that, The main control circuit is used to control the calibration switch circuit to turn off in the sampling working mode.

5. The current sampling circuit as described in claim 1, characterized in that, The main control circuit is also used to detect the temperature of the sampling calibration circuit, and to operate in the calibration mode when the temperature difference of the sampling calibration circuit reaches a preset threshold temperature.

6. The current sampling circuit as described in claim 1, characterized in that, The main control circuit is also used to operate in the calibration mode when the temperature change rate of the sampling calibration circuit is greater than the preset temperature rise rate.

7. The current sampling circuit as described in claim 4, characterized in that, The main control circuit is also used to alternate between the sampling working mode and the calibration working mode, and to control the calibration switch circuit to turn off in the sampling working mode.

8. The current sampling circuit as described in claim 4, characterized in that, The main control circuit operates in the sampling mode for a longer period than it operates in the calibration mode.

9. The current sampling circuit as described in claim 2, characterized in that, The current sampling circuit further includes: a first sampling switch circuit, which is connected between the negative sampling pin of the sampling calibration circuit and the second terminal of the resistor shunt circuit; The main control circuit is also used to control the first sampling switch circuit to turn on and the calibration switch circuit to turn off in the sampling working mode.

10. The current sampling circuit as described in claim 3, characterized in that, The current sampling circuit further includes: a second sampling switch circuit, which is connected between the positive sampling pin of the sampling calibration circuit and the first terminal of the resistor shunt circuit; The main control circuit is also used to control the second sampling switch circuit to be turned on in the sampling working mode, and to control the calibration switch circuit to be turned off.

11. The current sampling circuit as described in any one of claims 1-10, characterized in that, The current sampling circuit also includes an auxiliary current sampling circuit; The positive and negative sampling pins of the auxiliary current sampling circuit are respectively connected to the first and second terminals of the resistor shunt circuit. The auxiliary current sampling circuit is used to generate an auxiliary sampling signal based on the voltage at the first and second terminals of the resistor shunt circuit.

12. The current sampling circuit as described in claim 11, characterized in that, The sampling accuracy of the auxiliary current sampling circuit is less than that of the sampling calibration circuit.

13. The current sampling circuit as described in claim 11, characterized in that, The sampling calibration circuit and the auxiliary current sampling circuit are controlled by the main control circuit to alternately sample the current of the sampling loop.

14. The current sampling circuit as described in claim 11, characterized in that, The main control circuit is also used to receive the current sampling signal and the auxiliary sampling signal, and select the one with the higher voltage value as the actual current sampling signal based on the voltage values ​​of the current sampling signal and the auxiliary sampling signal.

15. The current sampling circuit as described in claim 11, characterized in that, The main control circuit is also used to select the auxiliary sampling signal as the actual current sampling signal output when operating in the calibration mode.

16. A vehicle power distribution architecture, characterized in that, include: The low-voltage battery, and the current sampling circuit as described in any one of claims 1-15, wherein the resistor shunt circuit is connected in series with the low-voltage battery.

17. A vehicle, characterized in that, include: The current sampling circuit as described in any one of claims 1-15.

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