Charge and discharge control circuit, chip, and electronic device

Abstract

Provided in the present application are a charge and discharge control circuit, a chip, and an electronic device. The charge and discharge control circuit comprises: a first discharge module, a second discharge module, and a connection detection module, wherein the first discharge module is used for controlling the discharge of a first transistor, the second discharge module is used for controlling the discharge of a second transistor, and the connection detection module is used for detecting whether the source electrodes of the first transistor and the second transistor are connected to each other or the drain electrodes thereof are connected to each other, and controlling the first discharge module and the second discharge module. The charge and discharge control circuit in the present application can avoid the phenomenon that a charge and discharge circuit cannot be quickly turned off due to different connection modes of the first transistor and the second transistor.

Description

Charge and discharge control circuits, chips and electronic equipment

[0001] This application claims priority to Chinese Patent Application No. 202411202835.5, filed on August 29, 2024, entitled “Charging and Discharging Control Circuit, Chip and Electronic Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of integrated circuit technology, specifically to a charge / discharge control circuit, chip, and electronic device. Background Technology

[0003] A Battery Management System (BMS) determines whether parameters such as voltage, current, and temperature of the battery are within safe ranges during charging and discharging, ensuring safe, reliable, and efficient use throughout the battery's lifespan. During monitoring, if any parameter exceeds the set limits, the charge / discharge control circuit will disconnect the battery from the load or charger. Therefore, charge / discharge control is crucial within a BMS.

[0004] In related technologies, battery charging and discharging control is mainly achieved through two transistors connected in series. These two transistors can be connected at their source terminals or at their drain terminals. One transistor acts as the charging transistor, and the other as the discharging transistor, to handle the charging and discharging control scenarios of the battery respectively. However, due to the different connection methods of the two transistors, current charging and discharging control circuits cannot simultaneously adapt to both source-to-drain and drain-to-source transistor connection methods. Technical solutions

[0005] In view of the above problems, embodiments of this application provide a charging and discharging control circuit, chip, and electronic device to solve the above technical problems.

[0006] In a first aspect, embodiments of this application provide a charge / discharge control circuit for controlling a charge / discharge circuit. The charge / discharge circuit includes a first transistor and a second transistor, wherein a first terminal of the first transistor is connected to a first terminal of the second transistor, or a second terminal of the first transistor is connected to a second terminal of the second transistor. The charge / discharge control circuit includes:

[0007] The first discharge module is used to control the discharge of the first transistor;

[0008] The second discharge module is used to control the discharge of the second transistor.

[0009] The connection detection module is used to detect whether the first transistor and the second transistor are connected to each other at their first terminals or to their second terminals, and controls the first discharge module and the second discharge module to discharge the first transistor and the second transistor according to the detected connection method.

[0010] Secondly, embodiments of this application also provide a chip including the above-described charge / discharge control circuit.

[0011] Thirdly, embodiments of this application also provide an electronic device, including the aforementioned chip or charge / discharge control circuit. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 shows a schematic diagram of a battery charging and discharging control circuit in the related technology.

[0014] Figure 2 shows another schematic diagram of a battery charge and discharge control circuit in the related technology.

[0015] Figure 3 shows a schematic diagram of a charge / discharge control circuit in an embodiment of this application.

[0016] Figure 4 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0017] Figure 5 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0018] Figure 6 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0019] Figure 7 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0020] Figure 8 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0021] Figure 9 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0022] Figure 10 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0023] Figure 11 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0024] Figure 12 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0025] Figure 13 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0026] Figure 14 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0027] Figure 15 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0028] Figure 16 shows another schematic diagram of the charge / discharge control circuit in an embodiment of this application.

[0029] Among them, the 200 charging and discharging circuit includes a battery BAT, a power supply voltage Vbat, a first transistor M1, a first node MA, and a second transistor M2; the 100 charging and discharging control circuit includes a first discharge module 10, a second discharge module 20, a connection detection module 30, a charge pump module 40, a first charge pump unit 41, and a second charge pump unit 42; the first current source IS1 includes a first comparator COMP1, a first preset voltage V01, a first switch S1, a second switch S2, a third switch S3, a fourth switch S4, a fifth switch S5, a sixth switch S6, a seventh switch S7, an eighth switch S8, a ninth switch S9, a tenth switch S10, a control voltage Vg, a first control voltage Vg1, and a second control voltage Vg2.

[0030] Implementation methods of this application

[0031] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0032] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] In the embodiments of this application, it should be noted that, in this document, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0034] Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0035] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0036] Furthermore, in the embodiments of this application, "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, such as one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it could include A, B, C, A and B, A and C, B and C, or A and B and C.

[0037] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after it are in an "or" relationship.

[0038] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0039] In the embodiments of this application, the control terminal of each transistor is the gate, the first terminal / first end of each transistor is one of the source and the drain, and the second terminal / second end of each transistor is the other of the source and the drain. Since the source and drain of a transistor can be structurally symmetrical, they can be structurally indistinguishable. That is, the first terminal / first end and the second terminal / second end of the transistor in the embodiments of this application can be structurally indistinguishable. For example, when the transistor is a P-type transistor, the first terminal / first end is the source, and the second terminal / second end is the drain; for example, when the transistor is an N-type transistor, the first terminal / first end is the drain, and the second terminal / second end is the source.

[0040] In the circuit structure provided by the embodiments of this application, nodes such as the first node and the second node do not represent actual existing components, but rather represent the junction points of related couplings in the circuit diagram. In other words, these nodes are equivalent to the junction points of related couplings in the circuit diagram.

[0041] In related technologies, battery charging and discharging control is mainly achieved through two transistors connected in series. The two transistors can be connected at their source terminals or at their drain terminals. One transistor acts as a charging transistor, and the other acts as a discharging transistor, to handle the control scenarios of battery charging and discharging respectively.

[0042] Referring to Figure 1, which shows a schematic diagram of a battery charging and discharging control circuit in the related art, the drains of transistors MN1 and MN2 are connected to each other. The charge pump 1 and charge pump 2 of the IC chip generate two control voltages through the supply voltage Vbat to control the conduction and cutoff of transistors MN1 and MN2 respectively. During the process of stopping charging or discharging, the fast discharge circuit 1 of the IC chip controls the source and gate of transistor MN1 to be short-circuited. During the process of stopping charging or discharging, the fast discharge circuit 2 of the IC chip controls the source and gate of transistor MN2 to be short-circuited. This causes transistors MN1 and MN2 to be quickly turned off, and finally causes the charging and discharging interface PACK to stop outputting Vpack voltage or connect to Vpack voltage.

[0043] Referring to Figure 2, which shows another schematic diagram of the battery charging and discharging control circuit in the related art, unlike Figure 1, the sources of transistors MN3 and MN4 are connected to each other. Therefore, during the process of stopping charging or stopping discharging, the fast discharge circuit 1 of the IC chip needs to control the source and gate of transistor MN1 to be shorted, and the fast discharge circuit 2 of the IC chip controls the source and gate of transistor MN2 to be shorted, so that transistors MN1 and MN2 are quickly turned off.

[0044] As can be seen from Figures 1 and 2, for the drain-to-source interconnection method, fast discharge circuit 1 connects the end of transistor MN1 connected to the battery to the gate, and fast discharge circuit 2 connects the end of transistor MN2 connected to the charge / discharge interface PACK to the gate. However, for the source-to-source interconnection method, fast discharge circuit 1 connects the end of transistor MN3 furthest from the battery to the gate, and fast discharge circuit 2 connects the end of transistor MN4 furthest from the charge / discharge interface PACK to the gate. This leads to the problem that fast discharge circuits for drain-to-source interconnection and source-to-source interconnection methods are not interchangeable. For example, when the fast discharge circuit 1 and fast discharge circuit 2 of an IC chip are designed for the drain-to-source interconnection method, a large number of external circuits (e.g., on a circuit board) are needed to control the source-to-source interconnection transistors MN3 and MN4.

[0045] Therefore, there is an urgent need for a universal charge / discharge control circuit that can be adapted to both drain-to-source and source-to-source interconnection methods. To this end, this application provides a charge / discharge control circuit 100, a chip, and an electronic device, which will be described in detail below.

[0046] Referring to Figure 3, Figure 3 shows a schematic diagram of a charge / discharge control circuit 100 in an embodiment of this application. The charge / discharge control circuit 100 is used to control a charge / discharge circuit 200. The charge / discharge circuit 200 includes a first transistor M1 and a second transistor M2. The first terminal of the first transistor M1 is connected to the first terminal of the second transistor M2, or the second terminal of the first transistor M1 is connected to the second terminal of the second transistor M2. The charge / discharge control circuit 100 includes a first discharge module 10, a second discharge module 20, and a connection detection module 30.

[0047] Specifically, the first transistor M1 and the second transistor M2 can control whether the battery BAT is discharged or charged. For example, when the first transistor M1 and the second transistor M2 are turned on at the same time, and the charging and discharging interface PACK is connected to the load, the battery BAT can output the charging and discharging interface voltage Vpack through the charging and discharging interface PACK to drive the load to work normally. When the charging and discharging interface PACK is connected to an external power source, after the first transistor M1 and the second transistor M2 are turned on at the same time, the charging and discharging interface voltage Vpack output by the charging and discharging interface PACK can charge the battery BAT.

[0048] It should be noted that when the first terminal of the first transistor M1 is connected to the first terminal of the second transistor M2, the first transistor M1 and the second transistor M2 are connected at their sources; conversely, when the second terminal of the first transistor M1 is connected to the second terminal of the second transistor M2, the first transistor M1 and the second transistor M2 are connected at their drains. For example, the first transistor M1 and the second transistor M2 can be NMOS transistors, IGBT transistors, or other transistors with switching functions.

[0049] The first discharge module 10 is connected to the first terminal, the second terminal, and the control terminal of the first transistor M1. The first discharge module 10 is used to control the first terminal of the first transistor M1 to conduct with the control terminal of the first transistor M1, so that the first transistor M1 discharges. For example, when the first transistor M1 and the second transistor M2 are connected as sources, the first terminal (common terminal) of the first transistor M1 is the source. Therefore, the first discharge module 10 can control the first terminal of the first transistor M1 to conduct with the control terminal of the first transistor M1, thereby making the gate and source voltages of the first transistor M1 equal and quickly turning it off. As another example, when the first transistor M1 and the second transistor M2 are connected as drains, the first terminal of the first transistor M1 (the other terminal besides the common terminal) is the source. Therefore, the first discharge module 10 can control the first terminal of the first transistor M1 to conduct with the control terminal of the first transistor M1, thereby making the gate and source voltages of the first transistor M1 equal and quickly turning it off.

[0050] The second discharge module 20 is connected to the first terminal, the second terminal, and the control terminal of the second transistor M2. The second discharge module 20 is used to control the first terminal of the second transistor M2 to conduct with the control terminal of the second transistor M2, so that the second transistor M2 discharges. For example, when the first transistor M1 and the second transistor M2 are connected as sources, the first terminal (common terminal) of the second transistor M2 is the source. Therefore, the second discharge module 20 can control the first terminal of the second transistor M2 to conduct with the control terminal of the second transistor M2, thereby making the gate and source voltages of the second transistor M2 equal and quickly turning it off. As another example, when the first transistor M1 and the second transistor M2 are connected as drains, the first terminal of the second transistor M2 (the other terminal besides the common terminal) is the source. Therefore, the second discharge module 20 can control the first terminal of the second transistor M2 to conduct with the control terminal of the second transistor M2, thereby making the gate and source voltages of the second transistor M2 equal and quickly turning it off.

[0051] The connection detection module 30 is used to detect whether the first transistor M1 and the second transistor M2 are connected at their first terminals (i.e., source-to-source) or at their second terminals (i.e., drain-to-drain). Based on the detected connection method, it controls the first discharge module 10 and the second discharge module 20 to discharge the first transistor M1 and the second transistor M2. For example, when the first transistor M1 and the second transistor M2 are connected at their sources, during the turn-off process of the charging / discharging circuit 200, the connection detection module 30, through the first discharge module 10, connects the first terminal of the first transistor M1 to its control terminal, and the first terminal of the second transistor M2 to its control terminal, thereby making the source voltage and gate voltage of the first transistor M1 and the second transistor M2 equal and quickly turning them off.

[0052] As an example, referring to FIG4, FIG4 shows another schematic diagram of the charge and discharge control circuit 100 in an embodiment of the present application. In this embodiment, the connection detection module 30 can be connected to the two ends of the body diode of the first transistor M1. If the first transistor M1 and the second transistor M2 are connected to each other as drains as shown in FIG4, then the resistance of the body diode of the first transistor M1 is approximately equal to 0. Therefore, the connection detection module 30 can determine that the first transistor M1 and the second transistor M2 are connected to each other as drains, thereby making the first end of the first transistor M1 conduct with the control end of the first transistor M1 and the first end of the second transistor M2 conduct with the control end of the second transistor M2 during the turn-off process of the charge and discharge circuit 200.

[0053] Conversely, referring to Figure 5, which shows another schematic diagram of the charge / discharge control circuit 100 in this embodiment, the connection detection module 30 can be connected to both ends of the body diode of the first transistor M1. If the first transistor M1 and the second transistor M2 are connected to each other as sources as shown in Figure 5, then the resistance across the body diode of the first transistor M1 is infinite. Therefore, the connection detection module 30 can determine that the first transistor M1 and the second transistor M2 are connected to each other as sources, thereby making the first end of the first transistor M1 conduct with the control end of the first transistor M1 and the first end of the second transistor M2 conduct with the control end of the second transistor M2 during the turn-off process of the charge / discharge circuit 200.

[0054] Therefore, in this embodiment, the application detects whether the first transistor M1 and the second transistor M2 are connected at their source or drain, through the connection detection module 30, and controls the first discharge module 10 and the second discharge module 20. When the first transistor M1 and the second transistor M2 are connected at their source, during the turn-off process of the charging and discharging circuit 200, the first discharge module 10 controls the first terminal of the first transistor M1 to be connected to the control terminal of the first transistor M1, and the second discharge module 20 controls the first terminal of the second transistor M2 to be connected to the control terminal of the second transistor M2. This is equivalent to short-circuiting the source and gate of the first transistor M1 and the second transistor M2, thereby making the source and gate voltages of the first transistor M1 and the second transistor M2 equal and turning off quickly.

[0055] Conversely, when the first transistor M1 and the second transistor M2 are connected at their drains, during the turn-off process of the charging and discharging circuit 200, the first discharge module 10 controls the first terminal of the first transistor M1 to be connected to the control terminal of the first transistor M1, and the second discharge module 20 controls the first terminal of the second transistor M2 to be connected to the control terminal of the second transistor M2. This is equivalent to short-circuiting the source and gate of the first transistor M1 and the second transistor M2, thereby making the source and gate voltages of the first transistor M1 and the second transistor M2 equal and turning them off quickly.

[0056] In other words, regardless of whether the first transistor M1 and the second transistor M2 are connected at their drains or at their sources, the charge-discharge control circuit 100 of this application can ensure that the sources and gates of the first transistor M1 and the second transistor M2 are short-circuited during the turn-off process of the charge-discharge circuit 200. This ensures that the source and gate voltages of the first transistor M1 and the second transistor M2 are equal and that the circuit is turned off quickly. This avoids the situation where the charge-discharge control circuit 100 cannot control the rapid turn-off of the charge-discharge circuit 200 due to the different connection methods of the first transistor M1 and the second transistor M2 in the charge-discharge circuit 200.

[0057] In some embodiments of this application, during the charging and discharging circuit shutdown process, the first discharge module 10 can turn on the first terminal and control terminal of the first transistor M1 in response to the enable signal output by the connection detection module 30, and the second discharge module 20 can turn on the first terminal and control terminal of the second transistor M2 in response to the enable signal output by the connection detection module 30.

[0058] For example, when the first transistor M1 and the second transistor M2 are connected at their sources, the connection detection module 30 can output a high-level signal as an enable signal to the first discharge module 10 and the second discharge module 20, thereby enabling the first discharge module 10 to conduct the first terminal and the control terminal of the first transistor M1, and the second discharge module 20 to conduct the first terminal and the control terminal of the second transistor M2; as another example, when the first transistor M1 and the second transistor M2 are connected at their drains, the connection detection module 30 can output a low-level signal as an enable signal to the first discharge module 10 and the second discharge module 20, thereby enabling the first discharge module 10 to conduct the first terminal and the control terminal of the first transistor M1, and the second discharge module 20 to conduct the first terminal and the control terminal of the second transistor M2.

[0059] In some embodiments of this application, referring to FIG6, FIG6 shows another schematic diagram of the charge and discharge control circuit 100 in an embodiment of this application. The first node MA between the first transistor M1 and the second transistor M2 is connected to the ground terminal, and the connection detection module 30 is used to determine whether the current between the first node MA and the ground terminal is greater than the first preset current.

[0060] For example, referring to Figure 7, which shows another schematic diagram of the charge / discharge control circuit 100 in an embodiment of this application, when the first transistor M1 and the second transistor M2 are connected at their drains and are in the off state, due to the unidirectional conduction characteristic of the body diodes in the first transistor M1 and the second transistor M2, there will be a current input from the battery Vbat and input to the ground terminal through the first node MA, or a current input from the charge / discharge interface PACK and input to the ground terminal through the first node MA. Therefore, there is a certain amount of current between the first node MA and the ground terminal. When the current between the first node MA and the ground terminal is greater than the first preset current, the connection detection module 30 can output a second enable signal (e.g., a high-level signal) to the first discharge module 10 and the second discharge module 20. The second enable signal indicates that the second terminals of the first transistor M1 and the second transistor M2 are connected to each other. Therefore, the first discharge module 10 and the second discharge module 20 can control the first transistor M1 and the second transistor M2 to turn off quickly in response to the second enable signal.

[0061] Referring to Figure 8, which shows another schematic diagram of the charge and discharge control circuit 100 in an embodiment of this application, when the first transistor M1 and the second transistor M2 are connected to each other at their sources and are in the off state, due to the presence of the body diodes in the first transistor M1 and the second transistor M2, the current between the first node MA and the ground terminal is basically equal to 0. Therefore, the connection detection module 30 can output a first enable signal (e.g., a low-level signal) to the first discharge module 10 and the second discharge module 20 when the current between the first node MA and the ground terminal is less than the first preset current. The first enable signal indicates that the first terminals of the first transistor M1 and the second transistor M2 are connected to each other. Therefore, the first discharge module 10 and the second discharge module 20 can control the first transistor M1 and the second transistor M2 to turn off quickly in response to the first enable signal.

[0062] As can be seen, this application can identify whether the first transistor M1 and the second transistor M2 are connected at their source or drain by detecting the current between the first node MA and the ground terminal. This ensures that the source and gate of the first transistor M1 and the second transistor M2 are short-circuited during the turn-off process of the charging and discharging circuit 200, thus avoiding the phenomenon that the charging and discharging circuit 200 cannot be turned off quickly due to the different connection methods of the first transistor M1 and the second transistor M2.

[0063] In some embodiments of this application, referring to FIG6, the connection detection module 30 is connected to the first node MA between the first transistor M1 and the second transistor M2. The connection detection module 30 can identify whether the first transistor M1 and the second transistor M2 are connected at their source terminals or at their drain terminals by detecting whether the voltage of the first node MA is greater than the first preset voltage V01.

[0064] For example, referring to Figure 7, when the first transistor M1 and the second transistor M2 are connected at their drains and are in the off state, the voltage of the first node MA is high due to the presence of the body diodes in the first transistor M1 and the second transistor M2. Therefore, when the voltage of the first node MA is greater than the first preset voltage V01, the connection detection module 30 outputs a second enable signal (e.g., a high-level signal) to the first discharge module 10 and the second discharge module 20. The second enable signal indicates that the second terminals of the first transistor M1 and the second transistor M2 are connected to each other. Therefore, the first discharge module 10 and the second discharge module 20 can control the first transistor M1 and the second transistor M2 to turn off quickly in response to the second enable signal.

[0065] Referring to Figure 8, when the first transistor M1 and the second transistor M2 are connected at their sources and are in the off state, the voltage of the first node MA is low due to the presence of the body diodes in the first transistor M1 and the second transistor M2. Therefore, when the voltage of the first node MA is less than the first preset voltage V01, the connection detection module 30 outputs a first enable signal (e.g., a low-level signal) to the first discharge module 10 and the second discharge module 20. The first enable signal indicates that the first terminals of the first transistor M1 and the second transistor M2 are connected to each other. Therefore, the first discharge module 10 and the second discharge module 20 can control the first transistor M1 and the second transistor M2 to turn off quickly in response to the first enable signal.

[0066] As can be seen, this application can also identify whether the first transistor M1 and the second transistor M2 are connected at their source or at their drain by detecting the voltage of the first node MA. This ensures that the source and gate of the first transistor M1 and the second transistor M2 are short-circuited during the turn-off process of the charging and discharging circuit 200, thus avoiding the phenomenon that the charging and discharging circuit 200 cannot be turned off quickly due to the different connection methods of the first transistor M1 and the second transistor M2.

[0067] As an exemplary embodiment of the connection detection module 30, referring to FIG9, FIG9 shows another schematic diagram of the charge and discharge control circuit 100 in this embodiment of the present application, wherein the connection detection module 30 includes a first current source IS1 and a first comparator COMP1; the input terminal of the first current source IS1 is connected to the first node MA, and the output terminal of the first current source IS1 is connected to the ground terminal; the first input terminal of the first comparator COMP1 is connected to the first node MA, the second input terminal of the first comparator COMP1 is used to connect to the first preset voltage V01, the output terminal of the first comparator COMP1 is connected to the first discharge module 10, and the output terminal of the first comparator COMP1 is connected to the second discharge module 20.

[0068] Taking the first input terminal of the first comparator COMP1 as the non-inverting input terminal and the second input terminal of the first comparator COMP1 as the inverting input terminal as an example, when the first transistor M1 and the second transistor M2 are turned off, if the first transistor M1 and the second transistor M2 are connected to each other by their drains, the voltage of the first node MA cannot be pulled down by the first current source IS1. Therefore, the voltage of the non-inverting input terminal of the first comparator COMP1 will be greater than the first preset voltage V01 connected to the inverting input terminal. The output terminal of the first comparator COMP1 outputs a high-level signal. Using this high-level signal, the first terminal of the first transistor M1 can be connected to the control terminal of the first transistor M1, and the first terminal of the second transistor M2 can be connected to the control terminal of the second transistor M2.

[0069] Conversely, if the first transistor M1 and the second transistor M2 are connected at their sources, the voltage of the first node MA can be pulled low by the first current source IS1. Therefore, the voltage at the non-inverting input of the first comparator COMP1 will be less than the first preset voltage V01 connected to the inverting input. The output of the first comparator COMP1 outputs a low-level signal. This low-level signal can be used to connect the first terminal of the first transistor M1 to the control terminal of the first transistor M1, and the first terminal of the second transistor M2 to the control terminal of the second transistor M2.

[0070] Understandably, the first input terminal of the first comparator COMP1 can also be an inverting input terminal, and the second input terminal of the first comparator COMP1 can also be a non-inverting input terminal.

[0071] In some embodiments of this application, referring to FIG10, FIG10 shows another schematic diagram of the charge and discharge control circuit 100 in an embodiment of this application, wherein the first discharge module 10 includes a first switch S1 and a second switch S2, the control terminals of the first switch S1 and the second switch S2 are connected to the connection detection module 30; the first terminal of the first switch S1 is connected to the common terminal of the first transistor M1, and the second terminal of the first switch S1 is connected to the control terminal of the first transistor M1; the first terminal of the second switch S2 is connected to the other terminal of the first transistor M1 relative to the common terminal, and the second terminal of the second switch S2 is connected to the control terminal of the first transistor M1.

[0072] It should be noted that the common terminal of the first transistor M1 refers to the end connected to the second transistor M2, and the other end of the first transistor M1 relative to the common terminal refers to the end not connected to the second transistor M2. When the first transistor M1 and the second transistor M2 are connected as drains, the first terminal of the first switch S1 is connected to the second terminal (drain) of the first transistor M1, and the first terminal of the second switch S2 is connected to the first terminal (source) of the first transistor M1. Therefore, the connection detection module 30 can control the second switch S2 to close and the first switch S1 to open, thereby connecting the first terminal of the first transistor M1 to the control terminal of the first transistor M1, so as to quickly disconnect the first transistor M1 during the turn-off process of the charging and discharging circuit 200. Conversely, when the second transistor M2 and the first transistor M1 are connected as sources, the connection detection module 30 can control the first switch S1 to close and the second switch S2 to open, thereby connecting the first terminal of the first transistor M1 to the control terminal of the first transistor M1, so as to quickly disconnect the first transistor M1 during the turn-off process of the charging and discharging circuit 200.

[0073] In some embodiments of this application, referring to FIG11, FIG11 shows another schematic diagram of the charge / discharge control circuit 100 in an embodiment of this application, wherein the first discharge module 10 further includes a third switch S3; the first end of the third switch S3 is connected to the control terminal of the first transistor M1, and the second end of the third switch S3 is connected to the ground terminal. Specifically, during the turn-off process of the charge / discharge circuit 200, the third switch S3 is in a closed state. Combined with the embodiment where the first switch S1 or the second switch S2 is closed, this is equivalent to simultaneously pulling down the gate metal plate and the substrate metal plate of the first transistor M1 to the ground terminal voltage, thereby facilitating the faster disconnection of the first transistor M1.

[0074] Understandably, the above embodiments are only exemplary embodiments of the first discharge module 10. The first discharge module 10 may also include a greater number of switches and / or electronic components. For example, referring to FIG12, FIG12 shows another schematic diagram of the charge and discharge control circuit 100 in the embodiment of this application. The first discharge module 10 may also include switches S01 and S02 to control switches S01 and S02 by a turn-off enable signal that controls the turn-off of the charge and discharge circuit 200.

[0075] In some embodiments of this application, referring to FIG13, FIG13 shows another schematic diagram of the charge and discharge control circuit 100 in an embodiment of this application, wherein the second discharge module 20 includes a fourth switch S4 and a fifth switch S5, the control terminals of the fourth switch S4 and the fifth switch S5 are connected to the connection detection module 30; the first terminal of the fourth switch S4 is connected to the common terminal of the second transistor M2, and the second terminal of the fourth switch S4 is connected to the control terminal of the second transistor M2; the first terminal of the fifth switch S5 is connected to the other terminal of the second transistor M2 relative to the common terminal, and the second terminal of the fifth switch S5 is connected to the control terminal of the second transistor M2.

[0076] It should be noted that the common terminal of the second transistor M2 refers to the end connected to the first transistor M1, and the other end of the second transistor M2 relative to the common terminal refers to the end not connected to the first transistor M1. When the first transistor M1 and the second transistor M2 are connected as drains, the first terminal of the fourth switch S4 is connected to the second terminal (drain) of the second transistor M2, and the first terminal of the fifth switch S5 is connected to the first terminal (source) of the second transistor M2. Therefore, the connection detection module 30 can control the fourth switch S4 to open and the fifth switch S5 to close, thereby connecting the first terminal of the second transistor M2 to the control terminal of the second transistor M2, so that the second transistor M2 is quickly disconnected during the turn-off process of the charging and discharging circuit 200. Conversely, when the second transistor M2 and the first transistor M1 are connected as sources, the connection detection module 30 can control the fifth switch S5 to open and the fourth switch S4 to close, thereby connecting the first terminal of the second transistor M2 to the control terminal of the second transistor M2, so that the second transistor M2 is quickly disconnected during the turn-off process of the charging and discharging circuit 200.

[0077] In some embodiments of this application, referring further to FIG13, the second discharge module 20 further includes a sixth switch S6; the first end of the sixth switch S6 is connected to the control terminal of the second transistor M2, and the second end of the sixth switch S6 is connected to the ground terminal. Specifically, during the turn-off process of the charging and discharging circuit 200, the sixth switch S6 is in a closed state. Combined with embodiments where the fourth switch S4 or the fifth switch S5 is closed, this is equivalent to simultaneously pulling down the gate metal plate and the substrate metal plate of the second transistor M2 to the ground terminal voltage, thereby facilitating a faster disconnection of the second transistor M2.

[0078] In some embodiments of this application, referring to FIG14, FIG14 shows another schematic diagram of the charge and discharge control circuit 100 in an embodiment of this application, wherein the charge and discharge control circuit 100 further includes a charge pump module 40, the charge pump module 40 being used to output a control voltage Vg to the control terminals of the first transistor M1 and the second transistor M2 according to the supply voltage Vbat, so as to control the first transistor M1 and the second transistor M2 to be turned on.

[0079] It should be noted that the charge pump module 40 can raise / lower the supplied voltage Vbat and output a control voltage Vg. For example, taking the first transistor M1 and the second transistor M2 as NMOS transistors, the charge pump module 40 can output a control voltage Vg that is higher than the supplied voltage Vbat. Therefore, the gates of the first transistor M1 and the second transistor M2 will be connected to the higher control voltage Vg, thereby making the voltage difference between the gate and source of the first transistor M1 greater than the threshold voltage of the first transistor M1, and the voltage difference between the gate and source of the second transistor M2 greater than the threshold voltage of the second transistor M2. This achieves the purpose of controlling the first transistor M1 and the second transistor M2 to conduct through the control voltage Vg output by the charge pump module 40.

[0080] For example, the charge pump module 40 may include any boost circuit and / or buck circuit, such as a boost circuit, a buck circuit, etc.

[0081] In some embodiments of this application, referring to FIG15, FIG15 shows another schematic diagram of the charge-discharge control circuit 100 in an embodiment of this application, wherein the charge pump module 40 includes a first charge pump unit 41 and a second charge pump unit 42; the first charge pump unit 41 is used to output a first control voltage Vg1 according to the supply voltage Vbat, and the second charge pump unit 42 is used to output a second control voltage Vg2 according to the supply voltage Vbat. The first control voltage Vg1 is used to control the charging transistor, and the second control voltage Vg2 is used to control the discharging transistor.

[0082] It should be noted that one of the first transistor M1 and the second transistor M2 is a charging transistor, and the other is a discharging transistor. When the first transistor M1 and the second transistor M2 are connected at their source or drain, the positions of the charging transistor and the discharging transistor are not the same. For example, in Figure 7, the first transistor M1 and the second transistor M2 are connected at their drain, in which case the first transistor M1 is a charging transistor, and the second transistor M2 is a discharging transistor; in Figure 8, the first transistor M1 and the second transistor M2 are connected at their source, in which case the first transistor M1 is a discharging transistor, and the second transistor M2 is a charging transistor. That is to say, the positions of the charging transistor and the discharging transistor are not the same when the source is connected or the drain is connected. If the control voltages Vg1 and Vg2 connected to the gates of the charging transistor and the discharging transistor are different, it may affect the conduction control of the charging transistor and the discharging transistor.

[0083] In this embodiment, the connection detection module 30 can also control the control terminal of the charging transistor to be connected to the first control voltage Vg1, and control the control terminal of the discharging transistor to be connected to the second control voltage Vg2. For example, when the first transistor M1 and the second transistor M2 are connected at their drains, the first transistor M1 is a charging transistor, and the second transistor M2 is a discharging transistor, the connection detection module 30 can control the control terminal of the first transistor M1 to be connected to the first control voltage Vg1, and control the control terminal of the second transistor M2 to be connected to the second control voltage Vg2. As another example, when the first transistor M1 and the second transistor M2 are connected at their sources, the first transistor M1 is a discharging transistor, and the second transistor M2 is a charging transistor, the connection detection module 30 can control the control terminal of the second transistor M2 to be connected to the first control voltage Vg1, and control the control terminal of the first transistor M1 to be connected to the second control voltage Vg2.

[0084] It can be seen that regardless of whether the first transistor M1 and the second transistor M2 are connected at their drains or at their sources, the connection detection module 30 can ensure that the charging transistor is connected to the first control voltage Vg1 and the discharging transistor is connected to the second control voltage Vg2. This avoids the phenomenon that the first transistor M1 and the second transistor M2 are connected to the wrong control voltage Vg due to the different ways in which the first transistor M1 and the second transistor M2 are connected at their sources or at their drains.

[0085] As an exemplary embodiment, referring to FIG16, FIG16 shows another schematic diagram of the charge-discharge control circuit 100 in an embodiment of the present application, wherein the charge pump module 40 further includes a seventh switch S7, an eighth switch S8, a ninth switch S9, and a tenth switch S10; the first end of the seventh switch S7 is connected to the output end of the first charge pump unit 41, the second end of the seventh switch S7 is connected to the control end of the first transistor M1, and the control end of the seventh switch S7 is connected to the connection detection module 30; the first end of the eighth switch S8 is connected to the output end of the first charge pump unit 41, the second end of the eighth switch S8 is connected to the control end of the second transistor M2, and the control end of the eighth switch S8 is connected to the connection detection module 30; the first end of the ninth switch S9 is connected to the output end of the second charge pump unit 42, the second end of the ninth switch S9 is connected to the control end of the first transistor M1, and the control end of the ninth switch S9 is connected to the connection detection module 30; the first end of the tenth switch S10 is connected to the output end of the second charge pump unit 42, the second end of the tenth switch S10 is connected to the control end of the second transistor M2, and the control end of the tenth switch S10 is connected to the connection detection module 30.

[0086] Specifically, when the first transistor M1 and the second transistor M2 are connected at their drains, and the first transistor M1 is a charging transistor while the second transistor M2 is a discharging transistor, the connection detection module 30 can control the seventh switch S7 to close, the eighth switch S8 to open, the ninth switch S9 to open, and the tenth switch S10 to close, thereby connecting the control terminal of the first transistor M1 (i.e., the charging transistor) to the first control voltage Vg1 and controlling the control terminal of the second transistor M2 (i.e., the discharging transistor) to the second control voltage Vg2.

[0087] Conversely, when the first transistor M1 and the second transistor M2 are connected as sources, the second transistor M2 is a charging transistor, and the first transistor M1 is a discharging transistor, the connection detection module 30 can control the seventh switch S7 to open, the eighth switch S8 to close, the ninth switch S9 to close, and the tenth switch S10 to open, thereby connecting the control terminal of the second transistor M2 (i.e., the charging transistor) to the first control voltage Vg1, and controlling the control terminal of the first transistor M1 (i.e., the discharging transistor) to the second control voltage Vg2.

[0088] It is worth noting that the above description of the charge and discharge control circuit 100 is intended to clearly illustrate the implementation and verification process of this application. Those skilled in the art can also make equivalent modifications under the guidance of this application. For example, by detecting the voltage difference and / or voltage across the body diode in the second transistor M2, it can be determined whether the first transistor M1 and the second transistor M2 are connected at their source terminals or at their drain terminals.

[0089] This application also provides a chip that includes the aforementioned charge / discharge control circuit 100. A chip (Integrated Circuit, IC) is also called a chip, and this chip can be, but is not limited to, a System on Chip (SOC) chip or a System in Package (SIP) chip. Since the chip of this application possesses the charge / discharge control circuit 100 described in the above embodiments, it has all the beneficial effects of the charge / discharge control circuit 100 in the above embodiments, which will not be repeated here.

[0090] This application also provides an electronic device, which includes a device body and a chip as described above disposed within the device body. The electronic device may be, but is not limited to, a weight scale, body fat scale, nutrition scale, infrared electronic thermometer, pulse oximeter, body composition analyzer, power bank, wireless charger, fast charger, car charger, adapter, display, USB (Universal Serial Bus) docking station, stylus, true wireless earphones, car center console screen, automobile, smart wearable device, mobile terminal, and smart home device. Smart wearable devices include, but are not limited to, smartwatches, smart bracelets, and neck massagers. Mobile terminals include, but are not limited to, smartphones, laptops, tablets, and POS (point of sales terminal) machines. Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart robot vacuums, and smart lights.

[0091] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Although this application has disclosed preferred embodiments as above, it is not intended to limit this application. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of this application. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A charging and discharging control circuit, characterized in that, The charge / discharge control circuit is used to control the charge / discharge circuit, which includes a first transistor and a second transistor. A first terminal of the first transistor is connected to a first terminal of the second transistor, or a second terminal of the first transistor is connected to a second terminal of the second transistor. The charge / discharge control circuit includes: A first discharge module is used to control the discharge of the first transistor; The second discharge module is used to control the discharge of the second transistor; A connection detection module is used to detect whether the first transistor and the second transistor are connected to each other at their first terminals or to their second terminals, and to control the first discharge module and the second discharge module to discharge the first transistor and the second transistor according to the detected connection method.

2. The charging and discharging control circuit as described in claim 1, characterized in that, During the shutdown process of the charging and discharging circuit, the first discharge module responds to the enable signal output by the connection detection module and turns on the first terminal and the control terminal of the first transistor, and the second discharge module responds to the enable signal output by the connection detection module and turns on the first terminal and the control terminal of the second transistor.

3. The charging and discharging control circuit as described in claim 1, characterized in that, The first node between the first transistor and the second transistor is connected to a ground terminal, and the connection detection module is used to determine whether the current between the first node and the ground terminal is greater than a first preset current. When the current between the first node and the ground terminal is less than the first preset current, the connection detection module outputs a first enable signal to the first discharge module and the second discharge module. The first enable signal indicates that the first terminals of the first transistor and the second transistor are interconnected. When the current between the first node and the ground terminal is greater than the first preset current, the connection detection module outputs a second enable signal to the first discharge module and the second discharge module. The second enable signal indicates that the second terminals of the first transistor and the second transistor are interconnected.

4. The charging and discharging control circuit as described in claim 1, characterized in that, The connection detection module is connected to a first node between the first transistor and the second transistor, and the connection detection module is used to determine whether the voltage of the first node is greater than a first preset voltage. When the voltage of the first node is less than the first preset voltage, the connection detection module outputs a first enable signal to the first discharge module and the second discharge module. The first enable signal indicates that the first terminals of the first transistor and the second transistor are interconnected. When the voltage of the first node is greater than the first preset voltage, the connection detection module outputs a second enable signal to the first discharge module and the second discharge module. The second enable signal indicates that the second terminals of the first transistor and the second transistor are interconnected.

5. The charging and discharging control circuit as described in claim 3 or 4, characterized in that, The connection detection module includes a first current source and a first comparator; The input terminal of the first current source is connected to the first node, and the output terminal of the first current source is connected to the ground terminal; The first input terminal of the first comparator is connected to the first node, the second input terminal of the first comparator is used to connect to the first preset voltage, the output terminal of the first comparator is connected to the first discharge module, and the output terminal of the first comparator is connected to the second discharge module.

6. The charge / discharge control circuit as described in claim 1, characterized in that, The first discharge module includes a first switch and a second switch, and the control terminals of the first switch and the second switch are connected to the connection detection module; The first terminal of the first switch is connected to the common terminal of the first transistor, and the second terminal of the first switch is connected to the control terminal of the first transistor. The first end of the second switch is connected to the other end of the first transistor relative to the common terminal, and the second end of the second switch is connected to the control terminal of the first transistor.

7. The charge / discharge control circuit as described in claim 6, characterized in that, The first discharge module also includes a third switch; The first terminal of the third switch is connected to the control terminal of the first transistor, and the second terminal of the third switch is connected to the ground terminal.

8. The charge / discharge control circuit as described in claim 1, characterized in that, The second discharge module includes a fourth switch and a fifth switch, and the control terminals of the fourth switch and the fifth switch are connected to the connection detection module; The first terminal of the fourth switch is connected to the common terminal of the second transistor, and the second terminal of the fourth switch is connected to the control terminal of the second transistor. The first terminal of the fifth switch is connected to the other terminal of the second transistor relative to the common terminal, and the second terminal of the fifth switch is connected to the control terminal of the second transistor.

9. The charge / discharge control circuit as described in claim 8, characterized in that, The second discharge module also includes a sixth switch; The first terminal of the sixth switch is connected to the control terminal of the second transistor, and the second terminal of the sixth switch is connected to the ground terminal.

10. The charge / discharge control circuit as described in claim 1, characterized in that, The charge / discharge control circuit also includes a charge pump module; The charge pump module is used to output a control voltage to the control terminals of the first transistor and the second transistor according to the supply voltage, so as to control the first transistor and the second transistor to conduct.

11. The charge / discharge control circuit as described in claim 9, characterized in that, The charge pump module includes a first charge pump unit and a second charge pump unit; The first charge pump unit is used to output a first control voltage according to the supply voltage, and the second charge pump unit is used to output a second control voltage according to the supply voltage; Wherein, one of the first transistor and the second transistor is a charging transistor, and the other is a discharging transistor. The first control voltage is used to control the charging transistor, and the second control voltage is used to control the discharging transistor. The connection detection module also controls the control terminal of the charging transistor to be connected to the first control voltage, and controls the control terminal of the discharging transistor to be connected to the second control voltage.

12. The charge / discharge control circuit as described in claim 11, characterized in that, The charge pump module also includes a seventh switch, an eighth switch, a ninth switch, and a tenth switch; The first terminal of the seventh switch is connected to the output terminal of the first charge pump unit, the second terminal of the seventh switch is connected to the control terminal of the first transistor, and the control terminal of the seventh switch is connected to the connection detection module. The first terminal of the eighth switch is connected to the output terminal of the first charge pump unit, the second terminal of the eighth switch is connected to the control terminal of the second transistor, and the control terminal of the eighth switch is connected to the connection detection module. The first terminal of the ninth switch is connected to the output terminal of the second charge pump unit, the second terminal of the ninth switch is connected to the control terminal of the first transistor, and the control terminal of the ninth switch is connected to the connection detection module. The first terminal of the tenth switch is connected to the output terminal of the second charge pump unit, the second terminal of the tenth switch is connected to the control terminal of the second transistor, and the control terminal of the tenth switch is connected to the connection detection module.

13. A chip, characterized in that, Includes the charge / discharge control circuit as described in any one of claims 1 to 12.

14. An electronic device, characterized in that, Includes the chip as described in claim 13.

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