High-side switch driving control circuit, battery management system and control circuit thereof

Abstract

The utility model discloses a high-side switch driving control circuit, a battery management system and a control circuit thereof, which comprises a control chip, an analog signal processing chip and a driving control module, and is characterized in that a first control end of the control chip is electrically connected with an input end of the analog signal processing chip; a second control end of the control chip is electrically connected with a first input end of the driving control module, an output end of the analog signal processing chip is electrically connected with a second input end of the driving control module, and an output end of the driving control module is electrically connected with a control end of a high-side driving switch of the battery charging loop; the driving control module is used for jointly controlling the on-off of a high-side driving switch of a battery charging loop by the control chip and the analog signal processing chip according to a first driving signal sent by the control chip and a second driving signal sent by the analog signal processing chip; the on-off of the high-side driving switch can be controlled after the control chip completes self-inspection, the battery cell is protected, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of battery charging technology, and in particular to a high-side switch drive control circuit and a battery management system and its control circuit. Background Technology

[0002] In existing battery charging circuits, the high-side switch drive control circuit typically uses an analog signal processing chip to directly send a drive signal to the high-side drive switch, controlling its conduction. The drawback of this circuit is that each time charging is activated, the analog signal processing chip prepares and turns on the high-side drive switch. Then, after the control chip powers on, the initialization program turns the high-side drive switch off. Only after initialization and self-test are complete, and charging is confirmed, is the high-side drive switch turned on again. During this process, there is a risk that the control chip may control the high-side drive switch to charge before completing its self-test, failing to fully protect the battery cell and potentially affecting cell lifespan and product functionality. Summary of the Invention

[0003] This utility model provides a high-side switch drive control circuit and a battery management system and its control circuit to solve the problem that the control chip in the existing control circuit controls the high-side drive switch to charge before completing its self-test, which reduces the battery life.

[0004] In one embodiment, a high-side switch drive control circuit for a battery charging circuit includes:

[0005] The system includes a control chip, an analog signal processing chip, and a drive control module. The first control terminal of the control chip is electrically connected to the input terminal of the analog signal processing chip, the second control terminal of the control chip is electrically connected to the first input terminal of the drive control module, the output terminal of the analog signal processing chip is electrically connected to the second input terminal of the drive control module, and the output terminal of the drive control module is electrically connected to the control terminal of the high-side drive switch of the battery charging circuit.

[0006] The drive control module is used to control the on / off state of the high-side drive switch of the battery charging circuit according to the first drive signal sent by the control chip and the second drive signal sent by the analog signal processing chip.

[0007] In one embodiment, the drive control module includes:

[0008] A first driving branch and a second driving branch are provided. The control terminal of the first driving branch is electrically connected to the output terminal of the analog signal processing chip. The input terminal of the first driving branch is electrically connected to the control terminal of the high-side driving switch of the battery charging circuit. The output terminal of the first driving branch is electrically connected to the input terminal of the second driving branch. The control terminal of the second driving branch is electrically connected to the second control terminal of the control chip. The output terminal of the second driving branch is grounded.

[0009] In one embodiment, the first driving branch includes:

[0010] A first switch, a first resistor, and a second resistor are provided. The control terminal of the first switch is connected to the output terminal of the analog signal processing chip through the first resistor. The input terminal of the first switch is used to send a control signal to the control terminal of the high-side drive switch of the battery charging circuit. The output terminal of the first switch is connected to the control terminal of the first switch through the second resistor, and the output terminal of the first switch serves as the output terminal of the first drive branch.

[0011] In one embodiment, the first drive branch further includes a third resistor and a fourth resistor. The input terminal of the first switch is connected to the control terminal of the high-side drive switch of the battery charging circuit through the third resistor. One end of the fourth resistor is connected to the third resistor, and the other end of the fourth resistor is connected to the output terminal of the high-side drive switch of the battery charging circuit.

[0012] In one embodiment, the second driving branch includes:

[0013] The second switch, the fifth resistor, and the sixth resistor are connected together. The control terminal of the second switch is connected to the second control terminal of the control chip through the fifth resistor. The input terminal of the second switch serves as the input terminal of the second drive branch. The output terminal of the second switch is connected to the control terminal of the second switch through the sixth resistor, and the output terminal of the second switch is grounded.

[0014] In one embodiment, the control chip is used to send a second drive signal to the control terminal of the second switch after initialization and self-test are completed, so as to control the second switch to turn on.

[0015] In one embodiment, the analog signal processing chip is used to send a first drive signal to the control terminal of the first switch after obtaining the activation charging command, so as to control the first switch to turn on after the second switch is turned on.

[0016] In one embodiment, both the first switch and the second switch are N-type switches, the first switch is a field-effect transistor, and the second switch is a bipolar transistor.

[0017] In one embodiment, a control circuit for a battery management system includes a battery charging circuit and the aforementioned high-side switch drive control circuit.

[0018] In one embodiment, a battery management system includes the aforementioned control circuit.

[0019] This utility model provides a high-side switch drive control circuit and a battery management system and its control circuit. By electrically connecting one input terminal of the drive control module to the control terminal of the analog signal processing chip, and electrically connecting the other input terminal of the drive control module to the control terminal of the control chip, the drive control module can simultaneously control the on / off state of the high-side drive switch of the battery charging circuit according to the first drive signal sent by the control chip and the second drive signal sent by the analog signal processing chip. This ensures that the on / off state of the high-side drive switch is controlled only after the control chip has completed its self-test, effectively protecting the battery cells and improving the battery's lifespan. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a high-side switch drive control circuit diagram of a battery charging circuit according to one embodiment of the present invention;

[0022] Label Explanation:

[0023] 10. Control chip; 20. Analog signal processing chip; 30. Drive control module; 40. Battery charging circuit; 31. First drive branch; 32. Second drive branch. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0025] It should be understood that this invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of this invention to those skilled in the art. In the drawings, for clarity, the dimensions of layers and regions, as well as their relative dimensions, may be exaggerated. The same reference numerals denote the same elements throughout.

[0026] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this utility model, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0027] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below,” “under,” or “below” other elements or features will be oriented “above” other elements or features. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0029] To fully understand this utility model, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this utility model. Preferred embodiments of this utility model are described in detail below; however, in addition to these detailed descriptions, this utility model may have other embodiments.

[0030] In one embodiment, such as Figure 1 As shown, a high-side switch drive control circuit for a battery charging circuit 40 is provided, the high-side switch drive control circuit comprising:

[0031] The system includes a control chip 10, an analog signal processing chip 20, and a drive control module 30. The first control terminal of the control chip 10 is electrically connected to the input terminal of the analog signal processing chip 20, the second control terminal of the control chip 10 is electrically connected to the first input terminal of the drive control module 30, the output terminal of the analog signal processing chip 20 is electrically connected to the second input terminal of the drive control module 30, and the output terminal of the drive control module 30 is electrically connected to the control terminal of the high-side drive switch of the battery charging circuit 40.

[0032] The drive control module 30 is used to control the on / off state of the high-side drive switch of the battery charging circuit 40 according to the first drive signal sent by the control chip 10 and the second drive signal sent by the analog signal processing chip 20.

[0033] The control process of the high-side switch drive control circuit of the above-mentioned battery charging circuit 40 includes:

[0034] The control chip 10 sends an activation signal to the analog signal processing chip 20 through the first control terminal. When the analog signal processing chip 20 is activated for charging, it sends a second drive signal to the drive control module 30. However, since the drive control module 30 does not receive the first drive signal, it cannot drive the high-side drive switch of the battery charging circuit 40 to switch on or off at this time. After the control chip 10 completes its self-test, it sends the first drive signal to the drive control module 30 again. At this time, the drive control module 30 can control the high-side drive switch of the battery charging circuit 40 to be turned on according to the first drive signal sent by the control chip 10 and the second drive signal sent by the analog signal processing chip 20, so as to control the battery charging circuit 40 to perform charging.

[0035] In this embodiment, the high-side switch drive control circuit electrically connects one input terminal of the drive control module 30 to the control terminal of the analog signal processing chip 20, and another input terminal of the drive control module 30 to the control terminal of the control chip 10. This allows the drive control module 30 to simultaneously control the on / off state of the high-side drive switch of the battery charging circuit 40 based on the first drive signal sent by the control chip 10 and the second drive signal sent by the analog signal processing chip 20. This ensures that the control chip 10 controls the on / off state of the high-side drive switch only after the self-test is completed, effectively protecting the battery cells and improving the battery's lifespan.

[0036] In one embodiment, such as Figure 1 As shown, the drive control module 30 includes:

[0037] A first driving branch 31 and a second driving branch 32 are connected. The control terminal of the first driving branch 31 is electrically connected to the output terminal of the analog signal processing chip 20. The input terminal of the first driving branch 31 is electrically connected to the control terminal of the high-side driving switch of the battery charging circuit 40. The output terminal of the first driving branch 31 is electrically connected to the input terminal of the second driving branch 32. The control terminal of the second driving branch 32 is electrically connected to the second control terminal of the control chip 10. The output terminal of the second driving branch 32 is grounded.

[0038] The analog signal processing chip 20 is used to send a second driving signal CHG to the control terminal of the first driving branch 31, and the control chip 10 is used to send a first driving signal CFET-ON to the control terminal of the second driving branch 32. This allows the first driving branch 31 to determine whether to output a control signal to the control terminal of the high-side driving switch of the battery charging circuit 40 based on the received second driving signal CHG and the second driving branch 32 to determine based on the received first driving signal CFET-ON, so as to turn on the high-side driving switch.

[0039] In one embodiment, the first drive branch 31 includes:

[0040] A first switch, a first resistor, and a second resistor are provided. The control terminal of the first switch is connected to the output terminal of the analog signal processing chip 20 through the first resistor. The input terminal of the first switch is used to send a control signal to the control terminal of the high-side drive switch of the battery charging circuit 40. The output terminal of the first switch is connected to the control terminal of the first switch through the second resistor, and the output terminal of the first switch serves as the output terminal of the first drive branch 31.

[0041] The analog signal processing chip 20 is used to send a second drive signal CHG to the control terminal of the first switch through the first resistor. When the control chip 10 sends a first drive signal CFET-ON to the control terminal of the second drive branch 32, the second drive branch 32 is turned on, so that the output terminal of the first switch is grounded. Then, according to the second drive signal CHG received by the control terminal of the first switch, the input terminal and the output terminal of the first switch are turned on. The control signal is output to the control terminal of the high-side drive switch of the battery charging circuit 40 through the input terminal of the first switch to turn on the high-side drive switch.

[0042] In one embodiment, the first drive branch 31 further includes a third resistor and a fourth resistor. The input terminal of the first switch is connected to the control terminal of the high-side drive switch of the battery charging circuit 40 through the third resistor. One end of the fourth resistor is connected to the third resistor, and the other end of the fourth resistor is connected to the output terminal of the high-side drive switch of the battery charging circuit 40.

[0043] Specifically, after receiving the second drive signal CHG at the control terminal of the first switch, the input and output terminals of the first switch are connected. A control signal is then output to the control terminal of the high-side drive switch of the battery charging circuit 40 through the input terminal of the first switch and the third resistor, so as to turn on the high-side drive switch and connect the input and output terminals of the high-side drive switch, allowing the battery charging circuit 40 to perform charging operations.

[0044] In one embodiment, the second drive branch 32 includes:

[0045] The second switch, the fifth resistor, and the sixth resistor are connected together. The control terminal of the second switch is connected to the second control terminal of the control chip 10 through the fifth resistor. The input terminal of the second switch serves as the input terminal of the second drive branch 32. The output terminal of the second switch is connected to the control terminal of the second switch through the sixth resistor, and the output terminal of the second switch is grounded.

[0046] The control chip 10 sends a first drive signal CFET-ON to the control terminal of the second switch through the fifth resistor, so that the input and output terminals of the second switch are connected, thereby grounding the output terminal of the first switch. Combined with the second drive signal CHG sent by the analog signal processing chip 20 to the control terminal of the first switch through the first resistor, the input and output terminals of the first switch are connected, thereby sending a low-level control signal from the input terminal of the first switch to the control terminal of the high-side drive switch, controlling the high-side drive switch to turn on.

[0047] In one embodiment, the control chip 10 is used to send a second drive signal to the control terminal of the second switch after initialization and self-test are completed, so as to control the second switch to be turned on.

[0048] The second drive signal refers to the effective control signal used by the control chip 10 to control the on / off state of the second switch, such as a high-level signal. During the initialization and self-test of the control chip 10, since no effective control signal is sent to the second switch, the second switch will not be turned on. Because the second switch remains off, even if the control terminal of the first switch receives the first drive signal sent by the analog signal processing chip 20, the second switch will not be turned on. Therefore, the high-side drive switch can be kept off, that is, during the initialization and self-test of the control chip 10, the accidental opening of the high-side drive switch is avoided, and the battery charging circuit 40 does not perform charging work, which can ensure the protection of the battery cells.

[0049] In one embodiment, the analog signal processing chip 20 is used to send a first drive signal to the control terminal of the first switch after obtaining the activation charging command, so as to control the first switch to turn on after the second switch is turned on.

[0050] Specifically, the control chip 10 can send an activation charging command to the analog signal processing chip 20. After receiving the command, the analog signal processing chip 20 sends a first drive signal to the control terminal of the first switch. However, if the second switch is not turned on at this time, the first switch cannot be turned on even if it receives the first drive signal. Only after the second switch is turned on can the first switch be turned on according to the received first drive signal, and can send a control signal to the control terminal of the high-side drive switch, thereby controlling the high-side drive switch to turn on.

[0051] In one embodiment, both the first switch and the second switch are N-type switches, the first switch is a field-effect transistor, and the second switch is a bipolar transistor.

[0052] Specifically, when the second switch is an N-type switch, and the first drive signal CFET-ON received at the control terminal of the second switch is high, the input and output terminals of the second switch are connected, grounding the output terminal of the first switch. When the first switch is an N-type switch, and the second drive signal CHG received at the control terminal of the first switch is high, the input and output terminals of the first switch are connected, and a control signal is output to the control terminal of the high-side drive switch of the battery charging circuit 40 through the input terminal of the first switch to turn on the high-side drive switch.

[0053] Specifically, the working process of the above-mentioned high-side switch drive control circuit is as follows:

[0054] When charging is initiated, the analog signal processing chip 20 (AFE) is activated, begins supplying power to the battery management system, and sends a high-level second drive signal to the control terminal of the first switch. During initialization and self-test, the control chip 10 (MCU) outputs a low-level first drive signal CFET_ON to the second switch, keeping the second switch off. This results in no voltage between the first pin PIN 1 and the second pin of the high-side drive switch CFET in the battery charging circuit 40, keeping the high-side drive switch CFET off. After the control chip 10 (MCU) completes initialization and self-test, the first drive signal CFET_ON output to the second switch becomes high, turning on the second switch. Since the second drive signal sent by the analog signal processing chip 20 (AFE) to the control terminal of the first switch is high, the first switch is turned on, thereby grounding the control terminal of the high-side drive switch CFET. The acquired control signal is low, turning on the high-side drive switch CFET.

[0055] The high-side switch drive control circuit of this embodiment ensures that the control chip 10 of the battery management system only turns on the high-side drive switch CFET after initialization and self-test are completed, thus ensuring complete protection of the battery cell and the realization of product functions. Furthermore, the circuit design cost is low, avoiding the problem in existing control circuits where the high-side drive switch is mistakenly turned on before the control chip 10 has completed its self-test, causing the battery charging circuit 40 to charge.

[0056] In one embodiment, a control circuit for a battery management system is provided, including a battery charging circuit 40 and a high-side switch drive control circuit described in any of the preceding embodiments.

[0057] The battery charging circuit 40 includes a cell module, a positive charging branch, and a negative charging branch. One end of the positive charging branch is connected to the positive terminal of the cell module, and the other end is connected to the positive terminal of the power supply. One end of the negative charging branch is connected to the negative terminal of the cell module, and the other end is connected to the negative terminal of the power supply. A high-side drive switch is connected in series on the positive charging branch. When the control terminal of the high-side drive switch receives a control signal from the drive control module 30, the high-side drive switch is turned on, initiating the charging operation of the battery charging circuit 40.

[0058] In one embodiment, a battery management system is provided, including the control circuit described in the previous embodiment. The battery management system may further include a signal acquisition module and a protection module electrically connected to the control chip 10. The signal acquisition module is used to acquire the charging voltage and charging current in the battery charging circuit 40, and the protection module is used to determine whether there is overvoltage based on the charging voltage and trigger overvoltage protection, and to determine whether there is overcurrent based on the charging current and trigger overcurrent protection.

[0059] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 utility model, and should all be included within the protection scope of this utility model.

Claims

1. A high-side switch drive control circuit for a battery charging circuit, characterized in that, The high-side switch drive control circuit includes: The system includes a control chip, an analog signal processing chip, and a drive control module. The first control terminal of the control chip is electrically connected to the input terminal of the analog signal processing chip, the second control terminal of the control chip is electrically connected to the first input terminal of the drive control module, the output terminal of the analog signal processing chip is electrically connected to the second input terminal of the drive control module, and the output terminal of the drive control module is electrically connected to the control terminal of the high-side drive switch of the battery charging circuit. The drive control module is used to control the on / off state of the high-side drive switch of the battery charging circuit according to the first drive signal sent by the control chip and the second drive signal sent by the analog signal processing chip.

2. The high-side switch drive control circuit according to claim 1, characterized in that, The drive control module includes: A first driving branch and a second driving branch are provided. The control terminal of the first driving branch is electrically connected to the output terminal of the analog signal processing chip. The input terminal of the first driving branch is electrically connected to the control terminal of the high-side driving switch of the battery charging circuit. The output terminal of the first driving branch is electrically connected to the input terminal of the second driving branch. The control terminal of the second driving branch is electrically connected to the second control terminal of the control chip. The output terminal of the second driving branch is grounded.

3. The high-side switch drive control circuit according to claim 2, characterized in that, The first driving branch includes: A first switch, a first resistor, and a second resistor are provided. The control terminal of the first switch is connected to the output terminal of the analog signal processing chip through the first resistor. The input terminal of the first switch is used to send a control signal to the control terminal of the high-side drive switch of the battery charging circuit. The output terminal of the first switch is connected to the control terminal of the first switch through the second resistor, and the output terminal of the first switch serves as the output terminal of the first drive branch.

4. The high-side switch drive control circuit according to claim 3, characterized in that, The first drive branch also includes a third resistor and a fourth resistor. The input terminal of the first switch is connected to the control terminal of the high-side drive switch of the battery charging circuit through the third resistor. One end of the fourth resistor is connected to the third resistor, and the other end of the fourth resistor is connected to the output terminal of the high-side drive switch of the battery charging circuit.

5. The high-side switch drive control circuit according to claim 3, characterized in that, The second drive branch includes: The second switch, the fifth resistor, and the sixth resistor are connected together. The control terminal of the second switch is connected to the second control terminal of the control chip through the fifth resistor. The input terminal of the second switch serves as the input terminal of the second drive branch. The output terminal of the second switch is connected to the control terminal of the second switch through the sixth resistor, and the output terminal of the second switch is grounded.

6. The high-side switch drive control circuit according to claim 5, characterized in that, The control chip is used to send a second drive signal to the control terminal of the second switch after initialization and self-test are completed, so as to control the second switch to turn on.

7. The high-side switch drive control circuit according to claim 6, characterized in that, The analog signal processing chip is used to send a first drive signal to the control terminal of the first switch after obtaining the activation charging command, so as to control the first switch to turn on after the second switch is turned on.

8. The high-side switch drive control circuit according to claim 5, characterized in that, Both the first and second switching transistors are N-type switching transistors. The first switching transistor is a field-effect transistor, and the second switching transistor is a bipolar transistor.

9. A control circuit for a battery management system, characterized in that, It includes a battery charging circuit and a high-side switch drive control circuit according to any one of claims 1 to 8.

10. A battery management system, characterized in that, Includes the control circuit as described in claim 9.

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