Control circuit and electronic device

Abstract

The application discloses a control circuit and electronic equipment, and belongs to the technical field of circuits. The control circuit comprises a first switching device, an input end of the first switching device being used for being connected with a positive electrode of a battery cell, a first protection device, a first end of the first protection device being used for being connected with the positive electrode of the battery cell, and a second end of the first protection device being connected with an enable end of the first switching device; a switching assembly, the switching assembly being connected with a negative electrode of the battery cell and being used for cutting off or connecting a power supply loop in which the battery cell is located; and a second protection device, a first end of the second protection device being connected with an output end of the first switching device, and a second end of the second protection device being connected with a control end of the switching assembly.

Description

Technical Field

[0001] This application belongs to the field of circuit technology, specifically relating to a control circuit and electronic device. Background Technology

[0002] When storing or transporting electronic devices, it is necessary to shut them down in order to reduce the power consumption of the battery cells within the devices.

[0003] However, with the continuous increase in replacement cycle, the time from the production of electronic devices to their sale to users is getting longer and longer. Even if the electronic devices are turned off, the battery cells still consume power at a low power level, which eventually causes the voltage in the battery cells to drop to the voltage at which charging is prohibited or even lower than the voltage at which charging is prohibited. This results in over-discharge of the battery cells, affecting their lifespan. Summary of the Invention

[0004] The purpose of this application is to provide a control circuit and electronic device that can solve the problem of over-discharge of the battery cell even when the electronic device is turned off, as the battery cell still consumes power at a low power consumption.

[0005] In a first aspect, embodiments of this application provide a control circuit for an electronic device, the electronic device including a battery cell, the control circuit including: a first switching device, the input terminal of the first switching device being connected to the positive terminal of the battery cell; a first protection device, the first terminal of the first protection device being connected to the positive terminal of the battery cell, and the second terminal of the first protection device being connected to the enable terminal of the first switching device; a switching assembly, the switching assembly being connected to the negative terminal of the battery cell, for cutting off or connecting the power supply circuit where the battery cell is located; and a second protection device, the first terminal of the second protection device being connected to the output terminal of the first switching device, and the second terminal of the second protection device being connected to the control terminal of the switching assembly; wherein, when a first level signal is input to the second terminal of the first protection device, the first protection device is disconnected, the first switching device outputs a high level signal, and the switching assembly cuts off the power supply circuit where the battery cell is located; when a second level signal is input to the second terminal of the second protection device, the second protection device is disconnected, and the switching assembly connects the power supply circuit where the battery cell is located.

[0006] Secondly, embodiments of this application provide an electronic device, including: a battery cell; and a control circuit as described in any of the first aspects, wherein the control circuit is connected to the battery cell.

[0007] In this application embodiment, a control circuit is proposed. By setting the control circuit in the electronic device, the power supply circuit where the battery cell is located can be cut off before the electronic device needs to be stored or transported, and the power supply circuit where the battery cell is located can be connected after the transportation or storage is completed.

[0008] During this process, because the power supply circuit of the battery cell is cut off during the storage or transportation of electronic devices, the loss of power in the battery cell can be reduced, and the voltage in the battery cell can be reduced to the voltage at which charging is prohibited or even lower than the voltage at which charging is prohibited, so that the battery cell will be over-discharged.

[0009] Furthermore, since the discharge power consumption of the battery cell is reduced, the storage or transportation time of electronic devices is extended while ensuring the lifespan of the battery cell, so as to meet the transportation or storage requirements of electronic devices in relevant technical solutions. Attached Figure Description

[0010] Figure 1 This is a topology diagram of the control circuit, battery cell, and motherboard before the electronic device enters the transport mode in this application embodiment;

[0011] Figure 2 This is a topology diagram of the control circuit, battery cell, and motherboard after the electronic device enters the transport mode in this application embodiment;

[0012] Figure 3 This is a topology diagram of the control circuit, battery cell, and motherboard after the electronic device exits the transport mode in this application embodiment;

[0013] Figure 4 This is a topology diagram of the control circuit, battery cell, and motherboard before the electronic device enters the transport mode in this application embodiment;

[0014] Figure 5 This is a topology diagram of the control circuit, battery cell, and motherboard after the electronic device enters the transport mode in this application embodiment;

[0015] Figure 6 This is a topological diagram of the control circuit, battery cell, and motherboard after the electronic device exits the transport mode in this application embodiment.

[0016] in, Figures 1 to 6 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0017] BT battery cell, Q1 first switching device, Q switch assembly, Q2 second switching device, Q3 third switching device, Q4 fourth switching device, F1 first protection device, F2 second protection device, R1 first resistor, R2 second resistor, IC battery protection chip, D diode, 100 main board, 102 button A, 104 button B, 106 power switch. Detailed Implementation

[0018] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated 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. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] The control circuits and electronic devices provided in this application will be described below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0023] In one embodiment, this application provides a control circuit for an electronic device, the electronic device including a battery cell BT, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the control circuit includes: a first switching device Q1, the input terminal of which is connected to the positive terminal VBAT+ of the battery cell BT; a first protection device F1, the first terminal of which is connected to the positive terminal VBAT+ of the battery cell BT, and the second terminal of which is connected to the enable terminal of the first switching device Q1; a switching assembly Q, which is connected to the negative terminal VBAT- of the battery cell BT and is used to cut off or connect the power supply circuit of the battery cell BT; and a second protection device F2, the first terminal of which is connected to the output terminal of the first switching device Q1, and the second terminal of which is connected to the control terminal of the switching assembly Q. When a first-level signal is input to the second terminal of the first protection device F1, the first protection device F1 is disconnected, the first switching device Q1 outputs a high-level signal, and the switching assembly Q cuts off the power supply circuit of the battery cell BT. When a second-level signal is input to the second terminal of the second protection device F2, the second protection device F2 is disconnected, and the switching assembly Q connects the power supply circuit of the battery cell BT.

[0024] In one embodiment, the power supply circuit of the battery cell BT, that is, the discharge circuit of the battery cell BT, can be understood as a loop connected to the positive terminal VBAT+ and the negative terminal VBAT- of the battery cell BT. Within the power supply circuit, the battery cell BT can provide power to the devices located within the power supply circuit so that the devices located within the power supply circuit can be powered on and operated.

[0025] In the above embodiment, after the input terminal of the first switching device Q1 is connected to the positive terminal VBAT+ of the battery cell BT, the voltage output from the positive terminal VBAT+ can be used as an input to the first switching device Q1. When the enable terminal of the first switching device Q1 is input to a non-first level signal (such as a high level signal), the first switching device Q1 is in the off state (that is, the voltage output from its output terminal is 0 volts). When the enable terminal of the first switching device Q1 is input to a first level signal, the first switching device Q1 is in the on state, and the output terminal of the first switching device Q1 outputs a high level signal, which is the power supply voltage of the battery cell BT.

[0026] Based on this, when a first-level signal is input to the second terminal of the first protection device F1, the voltage difference between the first and second terminals of the first protection device F1 is relatively large (such as the difference between the power supply voltage of the battery cell BT and the first-level signal). When this voltage difference is applied to the first protection device F1, the first protection device F1 disconnects, thus disconnecting the enable terminal of the first switching device Q1 from the positive terminal VBAT+ of the battery cell BT. At this time, the first switching device Q1 is in the conducting state, and its output terminal outputs a high-level signal. Under the action of the high-level signal, the switching assembly Q cuts off the power supply circuit of the battery cell BT, preventing the battery cell BT from outputting electrical energy.

[0027] In this embodiment, the second terminal of the first protection device F1 is input with a first level signal, which can occur during the manufacturing stage of the electronic device to facilitate the storage and transportation of the electronic device.

[0028] When a second level signal is input to the second terminal of the second protection device F2, the voltage difference between the first and second terminals of the second protection device F2 is large (such as the difference between the power supply voltage of the battery cell BT and the second level signal). When the second protection device F2 is activated, the second protection device F2 is disconnected, causing the output terminal of the first switching device Q1 to disconnect from the control terminal of the switching assembly Q, so that the switching assembly Q connects the power supply circuit where the battery cell BT is located, enabling the battery cell BT to output electrical energy.

[0029] In one embodiment, the first protection device F1 and the second protection device F2 are overcurrent protection devices. It can be understood that an overcurrent protection device disconnects when the current flowing through it exceeds its rated current value.

[0030] In one embodiment, the overcurrent protection device is a fuse or an air switch.

[0031] Specifically, if the first protection device F1 is the first fuse and the second protection device F2 is the second fuse, when a first level signal is input to the second terminal of the first fuse, the first fuse burns out, the first switching device Q1 outputs a high level signal, and the switching assembly Q cuts off the power supply circuit where the battery cell BT is located; when a second level signal is input to the second terminal of the second fuse, the second fuse burns out, and the switching assembly Q connects the power supply circuit where the battery cell BT is located.

[0032] In this embodiment, the second terminal of the second protection device F2 is input with a second level signal, which can occur during the activation phase of the electronic device. The activation phase can be understood as the first power-on of the electronic device after it is sold to the user.

[0033] In one embodiment, the first level signal and the second level signal can be the same level signal, specifically, it can be a low level signal (such as ground).

[0034] In this embodiment, by setting the control circuit in the electronic device, the power supply circuit where the battery cell BT is located can be cut off before the electronic device needs to be stored or transported, and the power supply circuit where the battery cell BT is located can be connected after the transportation or storage is completed.

[0035] During this process, because the power supply circuit of the battery cell BT is cut off during the storage or transportation of electronic devices, the loss of power in the battery cell BT can be reduced, and the voltage in the battery cell BT can be reduced to the voltage at which charging is prohibited or even lower than the voltage at which charging is prohibited, so that the battery cell BT will be over-discharged.

[0036] Furthermore, since the discharge power consumption of the battery cell BT is reduced, the storage or transportation time of electronic devices is extended while ensuring the service life of the battery cell BT, so as to meet the transportation or storage requirements of electronic devices in relevant technical solutions.

[0037] In one embodiment, the control circuit further includes a first resistor R1, the first end of which is connected to the second end of the first protection device F1, and the second end of the first resistor R1 is grounded.

[0038] In this embodiment, the first resistor R1 is configured to pull down the voltage at the enable terminal of the first switching device Q1 and ground it after the first protection device F1 is turned off, so that the first switching device Q1 remains in the on state.

[0039] During this process, the voltage at the enable terminal of the first switching device Q1 is pulled low and grounded by the first resistor R1, eliminating the need to continuously input the first level signal to the second terminal of the first protection device F1, thus facilitating the maintenance of the current state of the control circuit.

[0040] In one embodiment, the control circuit further includes a second resistor R2, the first end of which is connected to the second end of the second protection device F2, and the second end of the second resistor R2 is grounded.

[0041] In this embodiment, the second resistor R2 is configured to maintain the current state of the switch assembly Q after the second protection device F2 is disconnected, that is, to keep the switch assembly Q connected to the power supply circuit where the battery cell BT is located. During this process, there is no need to continuously input a second level signal to the second terminal of the second protection device F2, thus ensuring the reliability of the control circuit.

[0042] In one embodiment, the switching assembly Q includes: a battery protection chip IC; a second switching device Q2, the first terminal of which is connected to the negative terminal VBAT- of the battery cell BT, and the control terminal of which is connected to the battery protection chip IC; a third switching device Q3, the first terminal of which is connected to the battery protection chip IC, and the control terminal of which is connected to the second terminal of the second protection device Q2; and a fourth switching device Q4, which is located in the power supply circuit of the battery cell BT, the fourth switching device Q4 is connected to the second terminal of the second switching device Q2, and the control terminal of the fourth switching device Q4 is connected to the second terminal of the third switching device Q3.

[0043] In this embodiment, the specific configuration of the switching component Q is defined. Since the third switching device Q3 is located between the battery protection chip IC and the fourth switching device Q4, the conduction or cutoff of the third switching device Q3 affects the control of the fourth switching device Q4 by the battery protection chip IC. When the third switching device Q3 is in the cutoff state, the fourth switching device Q4 is also in the cutoff state. Therefore, when the power supply circuit of the battery cell BT is cut off, the fourth switching device Q4 also stops working. This reduces the energy consumption of the battery cell BT in maintaining the operation of the fourth switching device Q4, providing a basis for extending the service life of the battery cell BT.

[0044] In one embodiment, the control circuit further includes a diode D, the anode of which is connected to the second terminal of the second protection device F2, and the cathode of which is used to receive a second level signal.

[0045] In this embodiment, as described above, when the second level signal received at the second terminal of the second protection device F2 is a low level signal, the diode D conducts based on the single-phase conduction characteristic, the second protection device F2 is disconnected, and the switching component Q connects the circuit where the battery cell BT is located. If the second level signal is a high level, the diode D does not conduct based on the single-phase conduction characteristic, thereby reducing the probability of the electronic device exiting the transport mode.

[0046] In one embodiment, the cathode of diode D is grounded via the power button.

[0047] In this embodiment, when the power button is pressed, the cathode of diode D receives a low-level signal. Normally, electronic devices use the received low-level signal as the power-on signal. By setting diode D, the probability of the second protection device F2 and the third switching device Q3 malfunctioning when the electronic device uses a high-level signal as the power-on signal is avoided, thereby improving the reliability of the control circuit.

[0048] In one embodiment, when the switching component Q disconnects the power supply circuit where the battery cell BT is located, the electronic device is considered to be operating in a transport mode. Conversely, when the switching component Q connects the power supply circuit where the battery cell BT is located, the electronic device is considered to have exited the transport mode.

[0049] Based on this Figure 1 This is a topological diagram of the control circuit, battery cell BT, and motherboard 100 before the electronic device enters the transport mode in this embodiment of the application. Figure 1 As shown, by inputting a first-level signal to the second terminal of the first protection device F1 via the GPIO terminal, the electronic device enters the transport mode. Figure 2This is a topology diagram of the control circuit, battery cell BT, and motherboard 100 after the electronic device enters the transport mode in this application embodiment, as shown below. Figure 2 As shown, the first protection device F1 is disconnected because a first level signal is input to the second terminal of the first protection device F1 through the GPIO terminal.

[0050] Figure 3 This is a topology diagram of the control circuit, battery cell BT, and motherboard 100 after the electronic device exits the transport mode in this application embodiment, as shown below. Figure 3 As shown, when a second level signal is input to the second terminal of the second protection device F2, the second protection device F2 disconnects.

[0051] In one embodiment, this application provides an electronic device, which includes a battery cell BT and a control circuit as described in any of the above embodiments, the control circuit being connected to the battery cell BT.

[0052] In this embodiment, the proposed electronic device includes the battery cell BT and the control circuit as described above. Therefore, the electronic device has all the beneficial technical effects of the control circuit described above, which will not be repeated here.

[0053] In one embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the electronic device also includes: a motherboard 100, which is connected to the positive terminal VBAT+ of the battery cell BT and the switching assembly Q; wherein, the motherboard 100 is used to provide a first level signal to the control circuit.

[0054] In this embodiment, the electronic device further includes a motherboard 100. The motherboard 100 is connected to the positive terminal VBAT+ of the battery cell BT and the switching assembly Q to draw power from the battery cell BT. The motherboard 100 is connected to the negative terminal VBAT- of the battery cell BT via the switching assembly Q. It can be understood that the motherboard 100 is located in the power supply circuit of the battery cell BT. Based on this, the switching assembly Q can control whether the battery cell BT supplies power to the motherboard 100. Combined with the motherboard 100's ability to provide a first-level signal to the control circuit, the motherboard 100 can send a first-level signal to the control circuit so that the control circuit cuts off the power supply circuit of the battery cell BT and simultaneously cuts off the power supply from the battery cell BT to the motherboard 100, thereby reducing the impact of the motherboard 100 on the power consumption of the battery cell BT.

[0055] In one embodiment, the motherboard 100 integrates a main control chip, which receives user input and responds to the user input by inputting a first level signal to the control circuit.

[0056] Specifically, the motherboard 100 inputs a first level signal to the second terminal of the first protection device F1 through the GPIO terminal.

[0057] In one embodiment, the motherboard 100 further includes at least two buttons, wherein when the at least two buttons are in a preset state, the motherboard 100 is used to provide a first level signal to the control circuit.

[0058] In this embodiment, a triggering method for the first level signal is provided, wherein the states of at least two buttons are preset states, which can be understood as combined triggering. The preset states can be that at least two buttons are pressed simultaneously, or that at least two buttons are pressed in a pre-set pressing order to trigger the first level signal. Through the above limitations, the false triggering of the first level signal during the use, storage, handling, or transportation of the electronic device can be reduced, thereby improving the convenience of the electronic device.

[0059] In one embodiment, at least two buttons can be physical buttons, virtual buttons, or a combination of physical and virtual buttons; their specific forms will not be described in detail here.

[0060] Specifically, Figure 4 This is a topological diagram of the control circuit, battery cell BT, and motherboard 100 before the electronic device enters the transport mode in this embodiment of the application. Figure 4 As shown, by inputting a first-level signal to the second terminal of the first protection device F1 via at least two buttons (including button A102 and button B104), the electronic device enters the transport mode. Figure 5 This is a topological diagram of the control circuit, battery cell BT, and motherboard 100 after the electronic device enters the transport mode in this application embodiment, as shown below. Figure 5 As shown, the first protection device F1 is disconnected because a first level signal is input to the second terminal of the first protection device F1 through at least two buttons.

[0061] Figure 6 This is a topology diagram of the control circuit, battery cell BT, and motherboard 100 after the electronic device exits the transport mode in this application embodiment, as shown below. Figure 6 As shown, when a second level signal is input to the second terminal of the second protection device F2, the second protection device F2 disconnects.

[0062] In one embodiment, at least two buttons include a volume up button and a volume down button.

[0063] In one embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the motherboard 100 also includes a power switch 106, one end of which is grounded and the other end of which is connected to the control circuit. When the power switch 106 is in the closed state, the power switch 106 provides a second level signal to the control circuit.

[0064] In this embodiment, the triggering method of the second-level signal is specifically provided. In this embodiment, the triggering of the second-level signal is linked to the power switch 106 of the electronic device, so that when the user presses the power switch 106, the electronic device is powered on and the battery cell BT is woken up simultaneously. During this process, the user does not need to operate the electronic device separately to wake up the battery cell BT, thus simplifying the operation of waking up the battery cell BT without changing the user's usual habits of using the electronic device.

[0065] In one embodiment, the power switch 106 can be understood as a power button. When the power button is pressed, the power switch 106 is in a closed state.

[0066] In one embodiment, the electronic device can be a terminal or other device besides a terminal. For example, the electronic device can be a mobile phone, tablet computer, laptop computer, PDA, in-vehicle electronic device, mobile internet device (MID), augmented reality (AR) / virtual reality (VR) device, robot, wearable device, ultra-mobile personal computer (UMPC), netbook, or personal digital assistant (PDA), etc. It can also be a server, network attached storage (NAS), personal computer (PC), television (TV), ATM, or self-service machine, etc. This application does not specifically limit the scope of the embodiment.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A control circuit for electronic equipment, characterized in that, The electronic device includes a battery cell, and the control circuit includes: A first switching device, wherein the input terminal of the first switching device is used to connect to the positive terminal of the battery cell. A first protection device, wherein a first end of the first protection device is connected to the positive terminal of the battery cell, and a second end of the first protection device is connected to the enable terminal of the first switching device; A switching assembly, which is connected to the negative terminal of the battery cell, is used to cut off or connect the power supply circuit in which the battery cell is located; The second protection device has a first end connected to the output end of the first switching device and a second end connected to the control end of the switching assembly. Specifically, when a first-level signal is input to the second terminal of the first protection device, the first protection device is disconnected, the first switching device outputs a high-level signal, and the switching assembly cuts off the power supply circuit where the battery cell is located; when a second-level signal is input to the second terminal of the second protection device, the second protection device is disconnected, and the switching assembly connects the power supply circuit where the battery cell is located.

2. The control circuit according to claim 1, characterized in that, Also includes: The first resistor has its first end connected to the second end of the first protection device, and its second end is grounded.

3. The control circuit according to claim 1, characterized in that, Also includes: The second resistor has its first end connected to the second end of the second protection device, and its second end grounded.

4. The control circuit according to claim 1, characterized in that, The switching assembly includes: Battery protection chip; The second switching device has a first terminal connected to the negative terminal of the battery cell and a control terminal connected to the battery protection chip. A third switching device, wherein the first terminal of the third switching device is connected to the battery protection chip, and the control terminal of the third switching device is connected to the second terminal of the second protection device; A fourth switching device is located in the power supply circuit of the battery cell. The first end of the fourth switching device is connected to the second end of the second switching device, and the control end of the fourth switching device is connected to the second end of the third switching device.

5. The control circuit according to any one of claims 1 to 4, characterized in that, Also includes: A diode, wherein the anode of the diode is connected to the second terminal of the second protection device, and the cathode of the diode is used to receive the second level signal.

6. An electronic device, characterized in that, include: Battery cell; The control circuit as described in any one of claims 1 to 5, wherein the control circuit is connected to the battery cell.

7. The electronic device according to claim 6, characterized in that, Also includes: A motherboard, which is connected to the positive terminal of the battery cell and the switching assembly; The motherboard is used to provide a first level signal to the control circuit.

8. The electronic device according to claim 7, characterized in that, The motherboard also includes: At least two buttons are provided, and when the at least two buttons are in a preset state, the motherboard is used to provide a first level signal to the control circuit.

9. The electronic device according to claim 8, characterized in that, The at least two buttons include: Volume up button and volume down button.

10. The electronic device according to claim 7, characterized in that, The motherboard also includes: A power switch is provided, with one end grounded and the other end connected to the control circuit. When the power switch is in the closed state, the power switch provides a second level signal to the control circuit.

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