Total voltage acquisition circuit and device

Abstract

The utility model relates to the technical field of battery voltage acquisition, in particular to a total voltage acquisition circuit and device, and the circuit comprises a first control module, the input end of the first control module is connected with an externally connected MCU, and the first control module is used for controlling the on-off of the first control module according to a level control signal sent by the MCU; the input end of the signal stability maintaining module is connected with the output end of the first control module, the output end of the signal stability maintaining module is connected with the MCU, and the signal stability maintaining module is used for conducting signal stability maintaining on the level signal output by the first control module if the first control module is switched on and sending the level signal after signal stability maintaining to the MCU; and voltage acquisition is carried out. The battery total voltage acquisition method and device can realize the beneficial effect of improving the battery total voltage acquisition precision.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery voltage acquisition, in particular to a total voltage acquisition circuit and device. BACKGROUND

[0002] The total voltage is the accumulation of the voltage of the whole battery pack and reflects the voltage level of the whole battery pack. By monitoring the total voltage in real time, the battery pack can be ensured to work within a reasonable voltage range, and overcharging or overdischarging can be prevented. The total voltage is one of important parameters for calculating the remaining capacity (SOC) of the battery. Accurate SOC information can help the system more effectively manage the battery charging and discharging process and prolong the service life of the battery. It can be seen that the accuracy of the acquired total voltage is related to the accuracy of the capacity calculation. Therefore, how to optimize and improve the accuracy of total voltage acquisition is a technical problem to be solved. CONTENT OF THE INVENTION

[0003] The application aims to provide a total voltage acquisition circuit and device which can improve the accuracy of battery total voltage acquisition.

[0004] The application provides a total voltage acquisition circuit in the first aspect: comprising:

[0005] A first control module, an input end of the first control module being connected to an externally connected MCU, and being configured to control the on-off of the first control module according to a level control signal sent by the MCU;

[0006] A signal stabilization module, an input end of the signal stabilization module being connected to an output end of the first control module, and an output end of the signal stabilization module being connected to the MCU, and being configured to, if the first control module is turned on, stabilize the level signal output by the first control module, and send the level signal stabilized to the MCU for voltage acquisition.

[0007] By adopting the above technical scheme, the first control module receives the level control signal sent by the externally connected MCU, controls the on-off of the first control module according to the level control signal, and if the first control module is turned on, the voltage acquisition is started by connecting the signal stabilization module. The battery voltage signal is output to the signal stabilization module through the turned-on first control module, and the signal stabilization module outputs the battery voltage signal after processing and stabilization to the MCU to obtain the sampled total voltage value. Based on this, the output signal accuracy and stability are ensured by the signal stabilization module, so as to improve the accuracy of total voltage acquisition.

[0008] Optionally, the first control module comprises a first resistor, a second resistor, a first MOS tube, a third resistor, a fourth resistor, a second MOS tube and a fifth resistor.

[0009] One end of the first resistor is connected with an external battery control signal source, the other end is connected with a gate of the first MOS and one end of the second resistor, the other end of the second resistor is grounded;

[0010] The source of the first MOS is connected with one end of the third resistor, the other end of the third resistor is connected with a gate of the second MOS and one end of the fourth resistor, the drain of the first MOS is grounded;

[0011] The other end of the fourth resistor is connected with one end of the fifth resistor, the other end of the fifth resistor is connected with a positive electrode of the battery;

[0012] The connection between the fourth resistor and the fifth resistor is connected with a source of the second MOS, the drain of the second MOS is connected with an input end of the signal stabilization module.

[0013] By using the above technical scheme, the control signal sent by the battery control signal source (in the embodiment, can be sent by the MCU) is output to the ground through the first resistor and the second resistor, in this case, if the potential of the first resistor and the second resistor is enough to trigger the first MOS, the first MOS is turned on; after the first MOS is turned on, the positive electrode of the battery is output to the ground through the fifth resistor, the fourth resistor, the third resistor and the first MOS, in this case, the gate of the second MOS is pulled down and turned on, the signal output by the positive electrode of the battery can be output to the input end of the signal stabilization module through the second MOS, so that the control effect of starting or shutting off the total voltage acquisition is realized.

[0014] Optionally, the signal stabilization module comprises a sixth resistor, a seventh resistor, a follower, an eighth resistor and a ninth resistor;

[0015] One end of the sixth resistor is connected with the drain of the second MOS and one end of the seventh resistor, the other end of the sixth resistor is connected with a positive phase input end of the follower, the other end of the seventh resistor is grounded;

[0016] One end of the follower is connected with one end of the eighth resistor and one end of the ninth resistor, the other end of the eighth resistor is connected with the MCU;

[0017] The other end of the ninth resistor is connected with an inverting input end of the follower.

[0018] By adopting the technical scheme, after the first control module (or the second control module described below) is turned on, the positive electrode of the battery is output to the positive input end of the follower through the first control module (or the second control module described below), is collected through voltage division of the sixth resistor and the seventh resistor, the follower maintains the stability of the input signal, keeps the stability of the input signal, effectively isolates the influence between the front and rear circuits, the output voltage of the follower closely follows the input voltage, and has the characteristics of high input impedance and low output impedance, which makes it mainly play the roles of buffering, isolation and improving the load capacity in the circuit, thereby improving the reliability and stability of the output signal and further improving the precision of the total voltage collection.

[0019] Optionally, the signal stability maintaining module further comprises a first capacitor, one end of the first capacitor is connected to the other end of the eighth resistor, and the other end of the first capacitor is grounded.

[0020] By adopting the technical scheme, the collected signal output to the MCU after being maintained by the follower is processed to remove the interference signal, thereby further improving the reliability of the signal.

[0021] Optionally, the signal stability maintaining module further comprises a first voltage stabilizing tube, the negative electrode of the first voltage stabilizing tube is connected to the other end of the eighth resistor, and the positive electrode of the voltage stabilizing tube is grounded.

[0022] By adopting the technical scheme, the collected signal output to the MCU after being maintained by the follower is processed to remove the interference signal, thereby further improving the reliability of the signal.

[0023] Optionally, the signal stability maintaining module further comprises a first voltage stabilizing tube, the negative electrode of the first voltage stabilizing tube is connected to the other end of the eighth resistor, and the positive electrode of the voltage stabilizing tube is grounded.

[0024] The second control module, the input end of the second control module is connected to the MCU, the output end of the second control module is connected to the input end of the signal stability maintaining module, and the second control module is used for controlling the on-off of the second control module according to the level control signal sent by the MCU.

[0025] By adopting the technical scheme, the second control module can be used simultaneously with the first control module, and both are used for controlling the opening or closing of the total voltage collection, or the second control module can be used instead of the first control module; if they are used simultaneously, even if some devices in the first control module or the second control module are damaged, the smooth control of the total voltage collection can still be ensured to some extent, thereby improving the reliability of the total voltage collection and improving the user experience.

[0026] Optionally, the second control module comprises a third MOS tube.

[0027] The gate of the third MOS tube is connected with the battery control signal source, the source of the third MOS tube is connected with the connection between the fifth resistor and the second MOS tube, and the drain of the third MOS tube is connected with the connection between the sixth resistor and the seventh resistor.

[0028] By adopting the technical scheme, the third MOS tube is controlled by the control signal sent by the battery control signal source, and if the third MOS tube is controlled to be turned on, in this case, the voltage signal output by the positive electrode of the battery is collected and output to the positive input end of the follower through the sixth resistor and the seventh resistor.

[0029] Optionally, the second control module further comprises a second stabilizing tube, the negative electrode of the second stabilizing tube is connected with the connection between the third MOS tube and the fifth resistor, and the positive electrode of the second stabilizing tube is grounded.

[0030] By adopting the technical scheme, the voltage signal input to the follower through the third MOS tube is stabilized and clamped, so as to avoid the influence of overvoltage and the like on the output of the voltage signal, and also to avoid the damage of overvoltage to the components and devices, thereby prolonging the service life of the circuit.

[0031] Optionally, the second control module further comprises a second capacitor, one end of the second capacitor is connected with the connection between the third MOS tube and the fifth resistor, and the other end of the second capacitor is grounded.

[0032] By adopting the technical scheme, the voltage signal input to the follower through the third MOS tube is filtered by grounding the interference signal, so as to improve the stability of the signal input to the follower.

[0033] The second aspect of the present application provides a total voltage acquisition device loaded with the total voltage acquisition circuit.

[0034] In summary, the beneficial effects of the present application are: the first control module receives the level control signal sent by the externally connected MCU, controls the on-off of the first control module according to the level control signal, if the first control module is turned on, the access signal stabilizing module starts voltage collection, the battery voltage signal is output to the signal stabilizing module through the turned-on first control module, and the signal stabilizing module outputs the processed and stabilized battery voltage signal to the MCU to obtain the sampling total voltage value, wherein the voltage is collected through the sixth resistor and the seventh resistor, the follower stabilizes the input signal, maintains the stability of the input signal, effectively isolates the influence between the front and rear circuits, the output voltage of the follower closely follows the input voltage, and has the characteristics of high input impedance and low output impedance, which makes it mainly play the role of buffering, isolation, and improving the load capacity in the circuit, thereby improving the reliability and stability of the output signal, and further improving the accuracy of total voltage collection. Based on this, the signal stabilizing module ensures the accuracy and stability of the output signal, thereby improving the accuracy of total voltage collection. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a module connection diagram of the total voltage collection circuit provided by the embodiment of the present application;

[0036] Figure 2 is a circuit principle diagram of the total voltage collection circuit provided by the embodiment of the present application. DETAILED DESCRIPTION

[0037] The following embodiments will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made. These all belong to the protection scope of the present application.

[0038] In the following description, specific details such as specific system structures, techniques, etc. are presented in order to thoroughly understand the embodiments of the present application, but not to limit the present application. However, those skilled in the art should understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits and methods are omitted to avoid unnecessary details that hinder the description of the present application.

[0039] It should be understood that when used in the specification and the appended claims of the present application, the term "comprising" indicates the presence of the described features, whole, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0040] It should also be understood that the term “and / or” as used herein refers to a combination of any one or more of the associated listed items, and all possible combinations, and includes these combinations.

[0041] In addition, in the description of the present application and the appended claims, the terms “first”, “second”, “third” and the like are used only to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0042] In the present application, the reference “one embodiment” or “some embodiments” and the like means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements “in one embodiment”, “in some embodiments”, “in other some embodiments”, “in further some embodiments” and the like appearing in different places in the specification are not necessarily all referring to the same embodiment, but mean “one or more but not all embodiments”, unless otherwise specifically emphasized. The terms “include”, “contain”, “have” and their variants mean “include but not limited to”, unless otherwise specifically emphasized.

[0043] The present application is further described in detail below in conjunction with the accompanying drawings.

[0044] Reference Figure 1 , Figure 1 is a module connection diagram of the total voltage acquisition circuit provided by the embodiments of the present application, comprising:

[0045] The first control module is connected with the externally connected MCU at the input end, and is used for controlling the on-off of the first control module according to the level control signal sent by the MCU;

[0046] The signal stabilization module is connected with the output end of the first control module at the input end, and the output end of the signal stabilization module is connected with the MCU, and is used for, if the first control module is turned on, performing signal stabilization on the level signal output by the first control module, and sending the signal stabilized level signal to the MCU for voltage acquisition.

[0047] Specifically, the first control module receives the level control signal sent by the externally connected MCU, controls the on-off of the first control module according to the level control signal, and if the first control module is turned on, the voltage acquisition is started by connecting the signal stabilization module, the battery voltage signal is output to the signal stabilization module through the turned-on first control module, the signal stabilization module processes and stabilizes the battery voltage signal and then outputs it to the MCU to obtain the sampled total voltage value. Based on this, the signal stabilization module ensures the output signal precision and stability, thereby improving the precision of total voltage acquisition.

[0048] More specifically, refer to Figure 2 , Figure 2 is the circuit schematic diagram of the total pressure acquisition circuit provided by the embodiment of the application, comprising a first control module and a signal stabilization module, which will be described in detail as follows:

[0049] Regarding the first control module: the first control module comprises a first resistor R1, a second resistor R2, a first MOS tube Q1, a third resistor R3, a fourth resistor R4, a second MOS tube Q2 and a fifth resistor R5;

[0050] One end of the first resistor R1 is connected to an external battery control signal source, and the other end is connected to the gate of the first MOS tube Q1 and one end of the second resistor R2, and the other end of the second resistor R2 is grounded;

[0051] The source of the first MOS tube Q1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the gate of the second MOS tube Q2 and one end of the fourth resistor R4, and the drain of the first MOS tube Q1 is grounded;

[0052] The other end of the fourth resistor R4 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the positive electrode B+ of the battery;

[0053] The connection between the fourth resistor R4 and the fifth resistor R5 is connected to the source of the second MOS tube Q2, and the drain of the second MOS tube Q2 is connected to the input end of the signal stabilization module.

[0054] Specifically, the control signal sent by the battery control signal source (in this embodiment, which can be sent by the MCU) is output to the ground through the first resistor R1 and the second resistor R2, in which case, if the potential of the first resistor R1 and the second resistor R2 is sufficient to trigger the first MOS tube Q1, the first MOS tube Q1 is turned on; after the first MOS tube Q1 is turned on, the positive electrode B+ of the battery is output to the ground through the fifth resistor R5, the fourth resistor R4, the third resistor R3 and the first MOS tube Q1, in which case the gate of the second MOS tube Q2 is pulled down and turned on, and the signal output by the positive electrode B+ of the battery can be output to the input end of the signal stabilization module through the second MOS tube Q2, thereby realizing the control effect of starting or shutting down the total pressure acquisition.

[0055] Regarding the signal stabilization module: the signal stabilization module comprises a sixth resistor R6, a seventh resistor R7, a follower U1, an eighth resistor R8 and a ninth resistor R9;

[0056] One end of the sixth resistor R6 is connected to the drain of the second MOS tube Q2 and one end of the seventh resistor R7, and the other end of the sixth resistor R6 is connected to the positive input end of the follower U1, and the other end of the seventh resistor R7 is grounded;

[0057] The output end of the follower U1 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9, and the other end of the eighth resistor R8 is connected to the MCU.

[0058] The other end of the ninth resistor R9 is connected to the inverting input end of the follower U1.

[0059] Specifically, after the first control module (or the second control module described below) is turned on, the positive electrode B+ of the battery is output to the positive input end of the follower U1 through the first control module (or the second control module described below), and is collected by voltage division through the sixth resistor R6 and the seventh resistor R7. The follower U1 stabilizes the input signal, maintains the stability of the input signal, and effectively isolates the influence between the front and rear circuits. The output voltage of the follower U1 closely follows the input voltage, and has the characteristics of high input impedance and low output impedance, which makes it mainly play the role of buffering, isolation, and improving the load capacity in the circuit, thereby improving the reliability and stability of the output signal, and further improving the accuracy of the total voltage collection.

[0060] Optionally, the signal stabilization module further comprises a first capacitor C1, one end of the first capacitor C1 is connected to the other end of the eighth resistor R8, and the other end of the first capacitor C1 is grounded.

[0061] Specifically, the collected signal output to the MCU after being stabilized by the follower U1 is processed to eliminate interference signals to the ground, further improving the reliability of the signal.

[0062] Optionally, the signal stabilization module further comprises a first voltage stabilizing tube Z1, the negative electrode of the first voltage stabilizing tube Z1 is connected to the other end of the eighth resistor R8, and the positive electrode of the voltage stabilizing tube is grounded.

[0063] Specifically, the collected signal output to the MCU after being stabilized by the follower U1 is processed to eliminate interference signals to the ground, further improving the reliability of the signal.

[0064] Further, a second control module can also be added, and the second control module and the first control module are both used to control the opening or closing of voltage collection. In actual use, the first control module and the second control module can be used alternatively, or can be used simultaneously. The second control module will be described in detail as follows:

[0065] The input end of the second control module is connected with the MCU, and the output end of the second control module is connected with the input end of the signal stabilizing module, for controlling the on-off of the second control module according to the level control signal sent by the MCU.

[0066] Specifically, the second control module can be used simultaneously with the first control module, both for controlling the opening or closing of the total pressure acquisition, or can be used alternatively with the first control module; if used simultaneously, even if some devices in the first control module or the second control module are damaged, the smooth control of the total pressure acquisition can still be ensured to a certain extent, thereby improving the reliability of the total pressure acquisition and enhancing the user experience.

[0067] More specifically, please refer to Figure 2 , Figure 2 The specific circuit design of the second control module is described below in combination with the specific design:

[0068] The second control module comprises a third MOS tube Q3.

[0069] The gate of the third MOS tube Q3 is connected with the battery control signal source, the source of the third MOS tube Q3 is connected with the connection between the fifth resistor R5 and the second MOS tube Q2, and the drain of the third MOS tube Q3 is connected with the connection between the sixth resistor R6 and the seventh resistor R7.

[0070] Specifically, the third MOS tube Q3 is controlled by the control signal sent by the battery control signal source, and if the third MOS tube Q3 is controlled to be turned on, in this case, the voltage signal output by the battery positive electrode B+ is collected and output to the non-inverting input end of the follower U1 through the sixth resistor R6 and the seventh resistor R7.

[0071] Optionally, the second control module further comprises a second voltage stabilizing tube Z2, the negative electrode of the second voltage stabilizing tube Z2 is connected with the connection between the third MOS tube Q3 and the fifth resistor R5, and the positive electrode of the second voltage stabilizing tube Z2 is grounded.

[0072] Specifically, the voltage signal input to the follower U1 through the third MOS tube Q3 is stabilized and clamped to avoid the influence of overvoltage and the like on the output of the voltage signal, and also to avoid the damage of overvoltage to the components and devices, thereby prolonging the service life of the circuit.

[0073] Optionally, the second control module further comprises a second capacitor C2, one end of the second capacitor C2 is connected with the connection between the third MOS tube Q3 and the fifth resistor R5, and the other end of the second capacitor C2 is grounded.

[0074] Specifically, the voltage signal input to the follower U1 through the third MOS tube Q3 is filtered by the interference signal ground to improve the stability of the signal input to the follower U1.

[0075] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A total pressure acquisition circuit characterized by comprising: The application relates to a voltage sampling device. The device comprises a first control module, an input end of the first control module being connected with an externally accessed MCU, and the first control module being used for controlling on-off of the first control module according to a level control signal sent by the MCU; a signal stabilization module, an input end of the signal stabilization module being connected with an output end of the first control module, and an output end of the signal stabilization module being connected with the MCU, and the signal stabilization module being used for, if the first control module is turned on, stabilizing a level signal output by the first control module, and sending the signal-stabilized level signal to the MCU to perform voltage sampling. The first control module comprises a first resistor, a second resistor, a first MOS tube, a third resistor, a fourth resistor, a second MOS tube and a fifth resistor.

2. The total pressure acquisition circuit according to claim 1, characterized by: One end of the first resistor is connected with an external battery control signal source, the other end of the first resistor is connected with a gate of the first MOS tube and one end of the second resistor, and the other end of the second resistor is grounded. A source of the first MOS tube is connected with one end of the third resistor, the other end of the third resistor is connected with a gate of the second MOS tube and one end of the fourth resistor, and a drain of the first MOS tube is grounded. The other end of the fourth resistor is connected with one end of the fifth resistor, and the other end of the fifth resistor is connected with a positive electrode of a battery. The connection of the fourth resistor and the fifth resistor is connected with a source of the second MOS tube, and a drain of the second MOS tube is connected with an input end of the signal stabilization module. The signal stabilization module comprises a sixth resistor, a seventh resistor, a follower, an eighth resistor and a ninth resistor.

3. The total pressure acquisition circuit according to claim 2, characterized by: One end of the sixth resistor is connected with a drain of the second MOS tube and one end of the seventh resistor, the other end of the sixth resistor is connected with a positive-phase input end of the follower, and the other end of the seventh resistor is grounded. An output end of the follower is connected with one end of the eighth resistor and one end of the ninth resistor, the other end of the eighth resistor is connected with the MCU, and the other end of the ninth resistor is connected with an inverting-phase input end of the follower. The signal stabilization module further comprises a first capacitor, one end of the first capacitor is connected with the other end of the eighth resistor, and the other end of the first capacitor is grounded. The signal stabilization module further comprises a first stabilizing tube, a negative electrode of the first stabilizing tube is connected with the other end of the eighth resistor, and a positive electrode of the stabilizing tube is grounded.

4. The total pressure acquisition circuit according to claim 3, characterized by: The device further comprises a second control module, an input end of the second control module being connected with the MCU, and an output end of the second control module being connected with an input end of the signal stabilization module, and the second control module being used for controlling on-off of the second control module according to a level control signal sent by the MCU.

5. The total pressure acquisition circuit according to claim 3, characterized by: The second control module comprises a third MOS tube.

6. The total pressure acquisition circuit according to claim 3, characterized by A gate of the third MOS tube is connected with the battery control signal source, a source of the third MOS tube is connected with the connection of the fifth resistor and the second MOS tube, and a drain of the third MOS tube is connected with the connection of the sixth resistor and the seventh resistor. ​ 7. The total pressure acquisition circuit according to claim 6, characterized in that: ​ ​ 8. The total pressure acquisition circuit according to claim 7, characterized by: The second control module further comprises a second voltage stabilizer, a negative electrode of the second voltage stabilizer being connected to a connection between the third MOS tube and the fifth resistor, and a positive electrode of the second voltage stabilizer being grounded.

9. The total pressure acquisition circuit according to claim 7, characterized by: The second control module further comprises a second capacitor, one end of the second capacitor being connected to the connection between the third MOS tube and the fifth resistor, and the other end of the second capacitor being grounded.

10. A total pressure acquisition device characterized by comprising: The total pressure acquisition circuit according to any one of claims 1-9 is loaded.

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