Battery control circuit and electronic device

Abstract

The application discloses a battery control circuit and an electronic device. The battery control circuit comprises a first interface, a second interface, a first switch module, a second switch module and a third switch module. The first interface is configured to be connected with an input power supply, the second interface is configured to be connected with a battery, the first switch module is connected with the second switch module and the third switch module, the second switch module is connected with the first interface, and the third switch module is connected with the second interface. The first switch module is configured to be turned off when the first interface is connected with the input power supply, the second interface is connected with the battery, and the voltage of the battery is less than a first voltage threshold. The second switch module and the third switch module are both configured to be turned on based on the input power supply when the first interface is connected with the input power supply and the first switch module is turned off, so that the input power supply charges the battery through the second switch module and the third switch module. In this way, the charging chip for charging the battery can be reduced, and the cost can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a battery control circuit and electronic equipment. Background Art

[0002] Traditionally, batteries are non-rechargeable and non-recyclable. These batteries have limited energy and need to be replaced after a period of use, resulting in significant waste and environmental pollution. This has led to the emergence of recyclable batteries, also known as rechargeable batteries. Rechargeable batteries are widely used for energy storage and supply in electronics, power, energy storage, and other fields.

[0003] Currently, electronic products often include a system for charging rechargeable batteries. This system requires a dedicated charging chip to control the charging process of the rechargeable batteries. However, the high cost of such a chip leads to high design costs for electronic products that include it. Summary of the Invention

[0004] The present application aims to provide a battery control circuit and electronic device that can reduce the number of charging chips used to charge the battery and reduce costs.

[0005] To achieve the above objectives, in a first aspect, the present application provides a battery control circuit, comprising:

[0006] A first interface, a second interface, a first switch module, a second switch module, and a third switch module;

[0007] The first end of the first interface is used to be connected to the positive electrode of the input power supply, the first end of the second interface is used to be connected to the positive electrode of the battery, the first end of the first switch module is connected to the first end of the second switch module, the second end of the first switch module is connected to the second end of the second switch module and the first end of the third switch module, the third end of the first switch module is connected to the second end of the third switch module, the third end of the second switch module is connected to the first end of the first interface, the third end of the third switch module is connected to the first end of the second interface, and the second end of the first interface, the second end of the second interface, and the fourth end of the first switch module are all grounded;

[0008] The first switch module is configured to be turned off when the first interface is connected to the input power supply, the second interface is connected to the battery, and the voltage of the battery is less than a first voltage threshold;

[0009] The second switch module and the third switch module are both configured to be turned on based on the input power when the first interface is connected to the input power and the first switch module is turned off, so that the input power charges the battery through the second switch module and the third switch module.

[0010] In an optional manner, the first switch module includes a controllable voltage regulator, a first resistor and a second resistor;

[0011] The cathode of the controllable voltage-stabilizing diode is connected to the first end of the second switch module, the reference end of the controllable voltage-stabilizing diode is respectively connected to the first end of the first resistor and the first end of the second resistor, the second end of the first resistor is respectively connected to the second end of the second switch module and the third end of the third switch module, and the anode of the controllable voltage-stabilizing diode and the second end of the second resistor are both grounded.

[0012] In an optional manner, the second switch module includes a third resistor, a first switch, a first diode and a first capacitor;

[0013] A first end of the third resistor is connected to the first end of the first interface, a second end of the third resistor is connected to the anode of the first diode, a cathode of the first diode is respectively connected to the first end of the first switch, the first end of the first capacitor, and the first end of the first switch module, a second end of the first capacitor is connected to the third end of the first switch module, a second end of the first switch is respectively connected to the second end of the first switch module and the first end of the third switch module, and a third end of the first switch is connected to the first end of the first interface.

[0014] In an optional manner, the third switch module includes a second switch, a fourth resistor, a fifth resistor and a first light-emitting diode;

[0015] The first end of the second switch is respectively connected to the first end of the fourth resistor, the first end of the fifth resistor, the anode of the first light-emitting diode, and the third end of the first switch module; the second end of the second switch is respectively connected to the second end of the fourth resistor and the first end of the second interface; the third end of the second switch is respectively connected to the second end of the first switch module and the second end of the second switch module; the second end of the fifth resistor and the cathode of the first light-emitting diode are both grounded.

[0016] In an optional manner, the battery control circuit further includes a third interface and a fourth switch module;

[0017] The first end of the third interface is used to be connected to the positive electrode of the load, the first end of the fourth switch module is respectively connected to the second end of the first switch module, the second end of the second switch module, and the first end of the third switch module, the second end of the fourth switch module is connected to the first end of the first interface, the third end of the fourth switch module is connected to the first end of the third interface, and the second end of the third interface and the third end of the fourth switch module are both grounded;

[0018] The first switch module is configured to be turned on when the first interface is connected to the input power supply, the second interface is connected to the battery, and the voltage of the battery is greater than or equal to the first voltage threshold;

[0019] The second switch module is further configured to be turned off when the first switch module is turned on;

[0020] The fourth switch module is configured to be turned on when the second switch module is turned off, so as to establish a connection between the input power source and the first end of the third interface.

[0021] In an optional manner, the fourth switch module includes a first switch unit and a second switch unit;

[0022] The first end of the first switch unit is connected to the second end of the first switch module, the second end of the second switch module, and the first end of the third switch module, respectively; the second end of the first switch unit is connected to the first end of the second switch unit; the third end of the first switch unit is grounded; the second end of the second switch unit is connected to the first end of the first interface; and the third end of the second switch unit is connected to the first end of the third interface;

[0023] The first switch unit is configured to be turned on when the second switch module is turned off;

[0024] The second switch unit is configured to be turned on when the first switch unit is turned on, so as to establish a connection between the input power source and the first end of the third interface.

[0025] In an optional manner, the first switch unit includes a sixth resistor, a seventh resistor and a third switch;

[0026] The first end of the sixth resistor is respectively connected to the second end of the first switch module, the second end of the second switch module, and the first end of the third switch module; the second end of the sixth resistor is respectively connected to the first end of the third switch and the first end of the seventh resistor; the second end of the third switch is connected to the first end of the second switch unit; the second end of the seventh resistor and the third end of the third switch are both grounded.

[0027] In an optional manner, the second switch unit includes an eighth resistor and a fourth switch;

[0028] The first end of the eighth resistor is connected to the second end of the first switch unit, the second end of the eighth resistor is connected to the first end of the fourth switch, the second end of the fourth switch is connected to the first end of the third interface, and the third end of the fourth switch is connected to the first end of the first interface.

[0029] In an optional manner, the battery control circuit further includes a ninth resistor, a tenth resistor, a second light-emitting diode, and a third light-emitting diode;

[0030] A first end of the ninth resistor is connected to the first end of the first interface, a second end of the ninth resistor is respectively connected to the first end of the third interface, an anode of the second light-emitting diode, and an anode of the third light-emitting diode, a cathode of the second light-emitting diode is respectively connected to the cathode of the third light-emitting diode and the first end of the tenth resistor, and a second end of the tenth resistor is grounded;

[0031] The second light emitting diode is configured to light up when the first interface is connected to the input power supply;

[0032] The third light emitting diode is configured to light up when the second switch unit is turned on.

[0033] In a second aspect, the present application provides an electronic device comprising the battery control circuit as described above.

[0034] The beneficial effects of the present application are as follows: the battery control circuit provided by the present application includes a first interface, a second interface, a first switch module, a second switch module and a third switch module. Among them, the first interface is used to connect to the input power supply, the second interface is used to connect to the battery, the first switch module is connected to the second switch module and the third switch module, the second switch module is connected to the first interface, and the third switch module is connected to the second interface. When the first interface is connected to the input power supply and the second interface is connected to the battery, if the voltage of the battery is less than the first voltage threshold, the first switch module is turned off. Then, the second switch module and the third switch module are both controlled by the input power supply and turned on. The input power supply is connected to the battery after passing through the second switch module and the third switch module, and the input power supply can charge the battery. Therefore, compared with the solution of charging the battery through a charging chip in the traditional technology, the present application can realize charging the battery without using a more expensive charging chip, thereby achieving the purpose of reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0036] Figure 1 A schematic diagram of the structure of a battery control circuit provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the circuit structure of a battery control circuit provided in an embodiment of the present application;

[0038] Figure 3 This is a structural diagram of a battery control circuit provided in another embodiment of the present application. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the battery control circuit provided in the embodiment of the present application. Figure 1 As shown, the battery control circuit 100 includes a first interface J1, a second interface J2, a first switch module 10, a second switch module 20, and a third switch module 30. The first end J1_1 of the first interface J1 is connected to the positive electrode of the input power supply Vin, the first end J2_1 of the second interface J2 is connected to the positive electrode of the battery, the first end of the first switch module 10 is connected to the first end of the second switch module 20, the second end of the first switch module 10 is connected to the second end of the second switch module 20 and the first end of the third switch module 30, the third end of the first switch module 10 is connected to the second end of the third switch module 30, the third end of the second switch module 20 is connected to the first end J1_1 of the first interface J1, the third end of the third switch module 30 is connected to the first end J2_1 of the second interface J2, and the second end J1_2 of the first interface J1, the second end J2_2 of the second interface J2, and the fourth end of the first switch module 10 are all grounded to GND.

[0041] Specifically, the first switch module 10 is configured to be connected to the input power supply Vin at the first interface J1 and to the battery Bat at the second interface J2, and to be turned off when the voltage of the battery Bat is less than a first voltage threshold. The second switch module 20 and the third switch module 30 are both configured to be connected to the input power supply Vin at the first interface J1 and to be turned on based on the input power supply Vin when the first switch module 10 is turned off, so that the input power supply Vin charges the battery Bat through the second switch module 20 and the third switch module 30.

[0042] In this embodiment, when the first interface J1 is connected to the input power supply Vin and the second interface J2 is connected to the battery Bat, if the voltage of the battery Bat is less than the first voltage threshold, the first switch module 10 is in the off state. Subsequently, the second switch module 20 and the third switch module 30 can be controlled by the input power supply Vin to conduct. That is, the input power supply Vin can provide a conducting voltage to the second switch module 20 and the third switch module 30, so that the second switch module 20 and the third switch module 30 are conducting. In this case, the input power supply Vin, the second switch module 20, the third switch module 30, and the battery Bat form a loop, and the input power supply Vin can charge the battery Bat through the second switch module 20 and the third switch module 30. Thus, the battery charging process is realized. Moreover, compared with the technical solutions in the related art, the present application can also reduce the cost of the relatively high-cost charging chip used to charge the battery, which is conducive to reducing costs.

[0043] It is understandable that in this embodiment, the first voltage threshold can be set according to the actual application situation, and the embodiment of the present application does not impose specific restrictions on this. For example, in one embodiment, the first voltage threshold can be set to the voltage of the battery Bat when it is fully charged, wherein, if the voltage of the battery Bat exceeds the voltage when it is fully charged, the battery Bat will be overcharged abnormally. At this time, in this embodiment, charging will only be carried out when the voltage of the battery Bat is less than the first voltage threshold. On the one hand, more electricity can be charged into the battery Bat, that is, the battery Bat can be fully charged to improve the endurance of the battery Bat. On the other hand, it can prevent the battery Bat from causing an increase in internal pressure, deformation, leakage, etc. due to overvoltage, which can protect the battery and help extend the service life of the battery.

[0044] In one embodiment, if Figure 2As shown, the battery control circuit 100 further includes a third interface J3 and a fourth switch module 40. A first end J3_1 of the third interface J3 is used to connect to the positive electrode of the load 200. A first end of the fourth switch module 40 is respectively connected to the second end of the first switch module 10, the second end of the second switch module 20, and the first end of the third switch module 30. A second end of the fourth switch module 40 is connected to the first end J1_1 of the first interface J1. A third end of the fourth switch module 40 is connected to the first end J3_1 of the third interface J3. A second end J3_2 of the third interface J3 and a third end of the fourth switch module 40 are both grounded to GND.

[0045] Specifically, the first switch module 10 is configured to be turned on when the first interface J1 is connected to the input power supply Vin, the second interface J2 is connected to the battery Bat, and the voltage of the battery Bat is greater than or equal to a first voltage threshold. The second switch module 20 is also configured to be turned off when the first switch module 10 is turned on. The fourth switch module 40 is configured to be turned on when the second switch module 20 is turned off, thereby establishing a connection between the input power supply Vin and the first terminal J3_1 of the third interface J3.

[0046] In this embodiment, when the first interface J1 is connected to the input power supply Vin, the second interface J2 is connected to the battery Bat, and the third interface J3 is connected to the load 200, if the voltage of the battery Bat is greater than or equal to the first voltage threshold, the first switch module 10 is in the on state. At this point, the first terminal of the second switch module 20 is connected to ground GND after passing through the first switch module 10, forcing the first terminal of the second switch module 20 to be pulled low, and the second switch module 20 is turned off. Subsequently, the fourth switch module 40 is turned on, and the input power supply Vin forms a circuit through the fourth switch module 40, the first terminal J3_1 of the third interface J3, and the positive terminal of the load 200. In this case, on the one hand, because the second switch module 20 is turned off, the connection between the input power supply Vin and the battery Bat is disconnected, and the battery Bat is no longer charged. On the other hand, because the fourth switch module 40 is turned on, the input power supply Vin is connected to the load 200, and the load 200 is powered. In other words, the input power supply Vin does not charge the battery Bat but only powers the load 200.

[0047] Similarly, if the first voltage threshold is set to the voltage of the battery Bat when it is fully charged, then when the battery Bat is charged to the first voltage threshold, the battery Bat stops being charged. This can prevent the battery Bat from being overcharged, which is beneficial for protecting the battery Bat and extending the life of the battery Bat.

[0048] In one embodiment, if Figure 3As shown, the first switch module 10 includes a controllable voltage regulator DW1, a first resistor R1, and a second resistor R2. The cathode of the controllable voltage regulator DW1 is connected to the first end of the second switch module 20, the reference end of the controllable voltage regulator DW1 is connected to the first end of the first resistor R1 and the first end of the second resistor R2, respectively. The second end of the first resistor R1 is connected to the second end of the second switch module 20 and the third end of the third switch module 30, respectively. The anode of the controllable voltage regulator DW1 and the second end of the second resistor R2 are both grounded to GND.

[0049] Specifically, after power is applied to the controllable voltage-stabilizing diode DW1, a reference voltage is generated internally. This reference voltage changes with the voltage applied to the reference terminal. When the applied voltage increases and exceeds the reference voltage, the anode and cathode of the controllable voltage-stabilizing diode DW1 are conductive. When the applied voltage decreases and is even smaller than the reference voltage, the anode and cathode of the controllable voltage-stabilizing diode DW1 are disconnected. In one embodiment, the controllable voltage-stabilizing diode DW1 can utilize a TL431 three-terminal adjustable shunt reference source. In this case, the reference voltage of the controllable voltage-stabilizing diode DW1 is 2.5V. In this embodiment, simply selecting the first resistor R1 and the second resistor R2 of appropriate resistance values, and ensuring that the voltage at the junction of the first resistor R1 and the second resistor R2 is greater than or equal to 2.5V, will allow the anode and cathode of the controllable voltage-stabilizing diode DW1 to be conductive. It should be noted that the reference voltage of the controllable voltage-stabilizing diode DW1 can be set according to actual needs and is not limited in this embodiment.

[0050] The first resistor R1 and the second resistor R2 are used to divide the voltage input to the reference terminal of the controllable voltage regulator DW1 to prevent the controllable voltage regulator DW1 from being damaged due to excessive input voltage.

[0051] It is understood that in this embodiment, when the anode and cathode of the controllable voltage regulator DW1 are conductive, the first switch module 10 is turned on, and when the anode and cathode of the controllable voltage regulator DW1 are not conductive, the first switch module 10 is turned off. Furthermore, the first voltage threshold corresponds to the reference voltage of the controllable voltage regulator DW1.

[0052] In one embodiment, the second switch module 20 includes a third resistor R3, a first switch Q1, a first diode D1, and a first capacitor C1. A first end of the third resistor R3 is connected to the first end J1_1 of the first interface J1, a second end of the third resistor R3 is connected to the anode of the first diode D1, a cathode of the first diode D1 is connected to the first end of the first switch Q1, the first end of the first capacitor C1, and the first end of the first switch module 10 (i.e., the cathode of the controllable voltage regulator DW1), a second end of the first capacitor C1 is connected to the third end of the first switch module 10 (i.e., the reference end of the controllable voltage regulator DW1), a second end of the first switch Q1 is connected to the second end of the first switch module 10 (i.e., the second end of the first resistor R1) and the first end of the third switch module 30, and a third end of the first switch Q1 is connected to the first end J1_1 of the first interface J1.

[0053] In this embodiment, the first switch Q1 is an NMOS transistor, the gate of which is the first terminal of the first switch Q1, the source of which is the second terminal of the first switch Q1, and the drain of which is the third terminal of the first switch Q1.

[0054] Specifically, the third resistor R3 is a current-limiting resistor that limits the current flowing into the first switch Q1, preventing damage to the first switch Q1 due to excessive current, and thus protecting the first switch Q1. The first capacitor C1 is used for filtering to remove high-frequency interference. The first diode D1 utilizes its unidirectional conduction characteristics to prevent voltage and current backflow, that is, to prevent current from flowing from the negative electrode to the positive electrode. In one embodiment, the first diode D1 can be a Schottky diode.

[0055] In this embodiment, when the first switch Q1 is turned on, the second switch module 20 is turned on, and when the first switch Q1 is turned off, the second switch module 20 is turned off. Furthermore, when there is no conduction between the anode and cathode of the controllable voltage regulator DW1, the input power supply Vin provides a conduction voltage to the first terminal of the first switch Q1 through the third resistor R3 and the first diode D1. This means that the first switch Q1 can be controlled to conduct by the input power supply Vin. When the anode and cathode of the controllable voltage regulator DW1 are conductive, the first terminal of the first switch Q1 is forced low, and the first switch Q1 is turned off.

[0056] In one embodiment, the third switch module 30 includes a second switch Q2, a fourth resistor R4, a fifth resistor R5, and a first light-emitting diode LE1. The first end of the second switch Q2 is respectively connected to the first end of the fourth resistor R4, the first end of the fifth resistor R5, the anode of the first light-emitting diode LE1, and the third end of the first switch module 10. The second end of the second switch Q2 is respectively connected to the second end of the fourth resistor R4 and the first end J2_1 of the second interface J2. The third end of the second switch Q2 is respectively connected to the second end of the first switch module 10 and the second end of the second switch module 20 (i.e., the second end of the first switch Q1). The second end of the fifth resistor R5 and the cathode of the first light-emitting diode LE1 are both grounded to GND.

[0057] In this embodiment, the second switch Q2 is an NMOS transistor, the gate of the NMOS transistor is the first terminal of the second switch Q2, the source of the NMOS transistor is the second terminal of the second switch Q2, and the drain of the NMOS transistor is the third terminal of the second switch Q2.

[0058] The fourth resistor R4 and the fifth resistor R5 are used to divide the voltage of the battery Bat when the second interface J2 is connected to the battery Bat.

[0059] The first light-emitting diode LE1 can be used to indicate the operating status of the battery Bat. Specifically, when the voltage of the battery Bat is greater than or equal to the second voltage threshold, the voltage of the battery Bat divided by the fourth resistor R4 and the fifth resistor R5 can illuminate the first light-emitting diode LE1. When the voltage of the battery Bat is less than the second voltage threshold, the first light-emitting diode LE1 is off. In other words, when the first light-emitting diode LE1 is observed to be illuminated, the voltage of the corresponding battery Bat is greater than or equal to the second voltage threshold; when the first light-emitting diode LE1 is observed to be off, the voltage of the corresponding battery Bat is less than the second voltage threshold.

[0060] The above process can be used to implement over-discharge protection for the battery Bat. For example, in one embodiment, the second voltage threshold is set to the cutoff voltage for the discharge of the battery Bat. If the voltage of the battery Bat falls below the cutoff voltage, the battery Bat will experience an over-discharge anomaly, potentially damaging the active material in the battery Bat's electrodes, causing them to lose their ability to react, and shortening the life of the battery Bat. Therefore, when the first light-emitting diode LE1 is detected to be extinguished, the discharge process of the battery Bat is immediately stopped, thereby protecting the battery Bat and extending its service life.

[0061] In this embodiment, when the second switch Q2 is turned on, the third switch module 30 is turned on, and when the second switch Q2 is turned off, the third switch module 30 is turned off. When there is no conduction between the anode and cathode of the controllable voltage regulator DW1, the first switch Q1 is turned on. At this time, the input power Vin provides a turn-on voltage to the second switch Q2 after passing through the first switch Q1 and the first resistor R1, turning on the second switch Q2. The input power Vin charges the battery Bat through the first and second switches Q1 and Q2.

[0062] As the voltage of the battery Bat increases, the voltage at the second end of the first resistor R1 also increases, and so does the voltage at the reference end of the controllable voltage regulator DW1. This voltage increases until the voltage at the reference end of the controllable voltage regulator DW1 is greater than or equal to the reference voltage of the controllable voltage regulator DW1, and the anode and cathode of the controllable voltage regulator DW1 are conductive. The first end of the first switch Q1 is forced low due to ground GND, turning off the first switch Q1. At this point, the voltage of the battery Bat, after passing through the fourth resistor R4 and the fifth resistor R5, provides the conduction voltage for the second switch Q2, so the second switch Q2 remains conductive.

[0063] In one embodiment, the battery control circuit further includes an eleventh resistor R11 , wherein a first end of the eleventh resistor R11 is connected to the first end J1_1 of the first interface J1 , and a second end of the eleventh resistor R11 is connected to the third end of the first switch Q1 .

[0064] Specifically, the eleventh resistor R11 is used to limit the current, thereby limiting the charging current of the battery Bat when the first switch Q1 and the second switch Q2 are turned on. In other words, the eleventh resistor R11 can control the charging speed of the battery Bat. Specifically, by changing the resistance value of the eleventh resistor R1, the charging current of the battery Bat can be correspondingly changed, thereby changing the charging speed of the battery Bat.

[0065] In one embodiment, the fourth switch module 40 includes a first switch unit 41 and a second switch unit 42. A first end of the first switch unit 41 is connected to the second end of the first switch module 10, the second end of the second switch module 20, and the first end of the third switch module 30, respectively. A second end of the first switch unit 41 is connected to the first end of the second switch unit 42. A third end of the first switch unit 41 is grounded GND. A second end of the second switch unit 42 is connected to the first end J1_1 of the first interface J1. A third end of the second switch unit 42 is connected to the first end J3_1 of the third interface J3.

[0066] The first switch unit 41 is configured to be turned on when the second switch module 20 is turned off. The second switch unit 42 is configured to be turned on when the first switch unit 41 is turned on to establish a connection between the input power Vin and the first terminal J3_1 of the third interface J3.

[0067] In this embodiment, when the first switch unit 41 and the second switch unit 42 are both turned on, the corresponding fourth switch module 40 is turned on; when the first switch unit 41 and the second switch unit 42 are both turned off, the corresponding fourth switch module 40 is turned off.

[0068] In one embodiment, the first switch unit 41 includes a sixth resistor R6, a seventh resistor R7, and a third switch Q3. A first end of the sixth resistor R6 is connected to the second end of the first switch module 10, the second end of the second switch module 20, and the first end of the third switch module 30, respectively. A second end of the sixth resistor R6 is connected to the first end of the third switch Q3 and the first end of the seventh resistor R7, respectively. A second end of the third switch Q3 is connected to the first end of the second switch unit 42. A second end of the seventh resistor R7 and a third end of the fourth switch Q4 are both grounded to GND.

[0069] In this embodiment, the third switch Q3 is a PNP transistor, for example, wherein the base of the PNP transistor is the first terminal of the second switch Q2, the emitter of the PNP transistor is the second terminal of the second switch Q2, and the collector of the PNP transistor is the third terminal of the second switch Q2.

[0070] Specifically, the sixth resistor R6 and the seventh resistor R7 function as voltage-dividing resistors. When the first switch Q1 is on, the input power source Vin generates a high-level voltage at the first end of the third switch Q3 via the sixth resistor R6 and the seventh resistor R7, thereby keeping the third switch Q3 off. When the first switch Q1 is off and the second switch Q2 is on, the voltage of the battery Bat, after being divided by the sixth resistor R6 and the seventh resistor R7, generates a low-level voltage at the first end of the third switch Q3, thereby turning on the third switch Q3.

[0071] It can be understood that, in this embodiment, the third switch Q3 is turned on when the first switch unit 41 is turned on, and the third switch Q3 is turned off when the first switch unit 41 is turned off.

[0072] In one embodiment, the second switch unit 42 includes an eighth resistor R8 and a fourth switch Q4. A first end of the eighth resistor R8 is connected to a second end of the first switch unit 41, a second end of the eighth resistor R8 is connected to a first end of the fourth switch Q4, a second end of the fourth switch Q4 is connected to a first end J3_1 of the third interface J3, and a third end of the fourth switch Q4 is connected to a first end J1_1 of the first interface J1.

[0073] In this embodiment, the fourth switch Q4 is a PMOS transistor, whose gate is the first terminal of the second switch Q2, whose source is the second terminal of the second switch Q2, and whose drain is the third terminal of the second switch Q2.

[0074] Specifically, the eighth resistor R8 is a current-limiting resistor. When the third switch Q3 is on, the first end of the fourth switch Q4 is grounded and pulled low, turning on the fourth switch Q4. Subsequently, the first end J3_1 of the third interface J3 is connected to the positive electrode of the input power supply Vin through the fourth switch Q4 and the first end J1_1 of the first interface J1, powering the load 200. When the third switch Q3 is off, the fourth switch Q4 is also off.

[0075] It can be understood that, in this embodiment, the fourth switch Q4 is turned on when the second switch unit 42 is turned on, and the fourth switch Q4 is turned off when the second switch unit 42 is turned off.

[0076] In one embodiment, the battery control circuit further includes a ninth resistor R9, a tenth resistor R10, a second light-emitting diode LE2, and a third light-emitting diode LE3. A first end of the ninth resistor R9 is connected to the first end J1_1 of the first interface J1, a second end of the ninth resistor R9 is connected to the first end J3_1 of the third interface J3, the anode of the second light-emitting diode LE2, and the anode of the third light-emitting diode LE3, respectively. A cathode of the second light-emitting diode LE2 is connected to the cathode of the third light-emitting diode LE3 and the first end of the tenth resistor R10, respectively. A second end of the tenth resistor R10 is connected to ground GND.

[0077] Specifically, the second light emitting diode LE2 is configured to light up when the first interface J1 is connected to the input power supply Vin. The third light emitting diode LE3 is configured to light up when the second switch unit 42 is turned on.

[0078] In this embodiment, the ninth resistor R9 and the tenth resistor R10 both serve as current-limiting resistors to limit the current flowing through the second light-emitting diode LE2 and the third light-emitting diode LE3 .

[0079] When the first interface J1 is connected to the input power supply Vin, the input power supply Vin, the ninth resistor R9, the second LED LE2, and the tenth resistor R10 form a circuit, and the second LED LE2 illuminates due to the driving voltage. Therefore, the second LED LE2 serves as a power indicator, indicating that the first interface J1 is connected to the input power supply Vin.

[0080] When the second switch unit 42 is turned on, the input power supply Vin, the third light-emitting diode LE3, and the tenth resistor R10 form a loop, and the third light-emitting diode LE3 is illuminated by the driving voltage. Therefore, the third light-emitting diode LE3 can be used to indicate that the second switch unit 42 is turned on. In conjunction with the above embodiment, it can be seen that when the voltage of the battery Bat is greater than or equal to the first voltage threshold, the anode and cathode of the controllable voltage regulator DW1 are connected, and the first switch Q1 is turned off. Subsequently, the third switch Q3 and the fourth switch Q4 are both turned on, and the third light-emitting diode LE3 is illuminated.

[0081] Therefore, in one embodiment, if the first voltage threshold is set to the voltage at which the battery Bat is fully charged, then when the battery Bat is charged to the first voltage threshold, charging of the battery Bat stops, and the third LED LE3 is illuminated. Furthermore, when the battery Bat is not fully charged and is in the charging process, since the first switch Q1 remains on, both the third switch Q3 and the fourth switch Q4 are off, and the third LED LE3 is extinguished. Therefore, the third LED LE3 serves as an indicator light when the battery Bat is fully charged.

[0082] It should be noted that in the embodiments of the present application, the selection of each switch is only an example. In other embodiments, each switch can be any controllable switch, such as a field effect transistor MOSFET, an insulated gate bipolar transistor IGBT, a thyristor SCR, a gate turn-off thyristor GTO, a power transistor GTR, etc., or any commonly used switch, such as a contactor, a relay, a delay switch, a photoelectric switch, a touch switch, a proximity switch, etc., or a combination of the above types.

[0083] At the same time, each resistor in the embodiment of the present application can be a resistor with a fixed resistance value or an adjustable resistor, and the embodiment of the present application does not impose any specific restrictions on this.

[0084] In order to better understand this application, the following Figure 2 The working principle of the circuit structure shown is introduced.

[0085] In one embodiment, when the first interface J1 is connected to the input power supply Vin, the second interface J2 is connected to the battery Bat, and the third interface J3 is connected to the load 200, if the voltage of the battery Bat is less than a first voltage threshold, the anode and cathode of the controllable voltage regulator DW1 are disconnected. The input power supply Vin, the third resistor R3, the first diode D1, the first capacitor C1, and the second resistor R2 form a loop to generate a turn-on voltage at the first end of the first switch Q1, turning on the first switch Q1. Next, the input power supply Vin provides a turn-on voltage to the second switch Q2 through the eleventh resistor R11 and the first switch, turning on the second switch Q2. The input power supply Vin charges the battery Bat through the first and second switches Q1 and, at the same time, provides a driving voltage to the second light-emitting diode LE2 through the ninth resistor R9, thereby illuminating the second light-emitting diode LE2.

[0086] Thus, the battery charging process is realized, and compared with the technical solutions in the related art, the present application can also reduce the high-cost charging chip used to charge the battery, which is conducive to reducing costs.

[0087] Then, when the battery Bat is charged to a voltage greater than or equal to a first voltage threshold, the anode and cathode of the controllable voltage regulator DW1 are connected, the first switch Q1 is turned off, and the second switch Q2 remains on. The voltage of the battery Bat passes through the second switch Q2, the sixth resistor R6, and the seventh resistor R7 to provide a low-level voltage to the third switch Q3, turning on the third switch Q3 and the fourth switch Q4. The input power Vin provides a driving voltage to the third light-emitting diode LE3 through the fourth switch Q4, illuminating the third light-emitting diode LE3.

[0088] As can be seen, if the first voltage threshold is the voltage of the battery Bat when it is fully charged, then when the battery Bat reaches the fully charged value, the input power supply Vin stops charging the battery Bat, and the third light-emitting diode LE3 is illuminated as an indication to alert the user. This prevents the battery Bat from overcharging, improves the stability of the battery Bat, and extends the service life of the battery Bat.

[0089] It will be appreciated that in this embodiment, after the battery Bat is fully charged, if the battery Bat is used to discharge the load, causing the voltage of the battery Bat to gradually decrease, then when the voltage of the battery Bat drops below the first voltage threshold, the anode and cathode of the controllable voltage regulator DW1 are no longer conductive. The first switch Q1 is then turned on, and the input power supply Vin can again charge the battery Bat.

[0090] In another embodiment, when the first interface J1 is not connected to the input power Vin and the second interface J2 is connected to the battery Bat, the battery Bat can serve as the power source to power the load. In this case, since the first interface J1 is not connected to the input power Vin, the first switch Q1 is turned off, while the second switch Q2 is turned on by the voltage provided by the battery Bat (when the voltage of the battery Bat is greater than or equal to the second voltage threshold). At this time, the voltage provided by the battery Bat can also provide a driving voltage for the first light-emitting diode LE1, thereby illuminating the first light-emitting diode LE1. When the battery Bat discharges to a voltage below the second voltage threshold, the second switch Q2 turns off, and the first light-emitting diode LE1 is extinguished.

[0091] As can be seen, if the second voltage threshold is the cutoff voltage of the battery Bat during discharge, then when the battery Bat is discharged to the cutoff voltage, the second switch Q2 is turned off, and the first light-emitting diode LE1 is extinguished as an indication to alert the user. This can prevent the battery Bat from over-discharging, improve the stability of the battery Bat, and extend the service life of the battery Bat.

[0092] An embodiment of the present application further provides an electronic device, which includes the battery control circuit in any of the above embodiments.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present application as described above. For the sake of simplicity, they are not provided in detail. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery control circuit, characterized in that: include: A first interface, a second interface, a first switch module, a second switch module, and a third switch module; The first end of the first interface is used to be connected to the positive electrode of the input power supply, the first end of the second interface is used to be connected to the positive electrode of the battery, the first end of the first switch module is connected to the first end of the second switch module, the second end of the first switch module is connected to the second end of the second switch module and the first end of the third switch module, the third end of the first switch module is connected to the second end of the third switch module, the third end of the second switch module is connected to the first end of the first interface, the third end of the third switch module is connected to the first end of the second interface, and the second end of the first interface, the second end of the second interface, and the fourth end of the first switch module are all grounded; The first switch module is configured to be turned off when the first interface is connected to the input power supply, the second interface is connected to the battery, and the voltage of the battery is less than a first voltage threshold; The second switch module and the third switch module are both configured to be turned on based on the input power when the first interface is connected to the input power and the first switch module is turned off, so that the input power charges the battery through the second switch module and the third switch module; The first switch module includes a controllable voltage regulator, a first resistor and a second resistor; The cathode of the controllable voltage-stabilizing diode is connected to the first end of the second switch module, the reference end of the controllable voltage-stabilizing diode is connected to the first end of the first resistor and the first end of the second resistor respectively, the second end of the first resistor is connected to the second end of the second switch module and the third end of the third switch module respectively, and the anode of the controllable voltage-stabilizing diode and the second end of the second resistor are both grounded; The battery control circuit also includes a third interface and a fourth switch module; The first end of the third interface is used to be connected to the positive electrode of the load, the first end of the fourth switch module is respectively connected to the second end of the first switch module, the second end of the second switch module, and the first end of the third switch module, the second end of the fourth switch module is connected to the first end of the first interface, the third end of the fourth switch module is connected to the first end of the third interface, and the second end of the third interface and the third end of the fourth switch module are both grounded; The first switch module is configured to be turned on when the first interface is connected to the input power supply, the second interface is connected to the battery, and the voltage of the battery is greater than or equal to the first voltage threshold; The second switch module is further configured to be turned off when the first switch module is turned on; The fourth switch module is configured to be turned on when the second switch module is turned off, so as to establish a connection between the input power source and the first end of the third interface.

2. The battery control circuit according to claim 1, characterized in that: The second switch module includes a third resistor, a first switch, a first diode and a first capacitor; A first end of the third resistor is connected to the first end of the first interface, a second end of the third resistor is connected to the anode of the first diode, a cathode of the first diode is respectively connected to the first end of the first switch, the first end of the first capacitor, and the first end of the first switch module, a second end of the first capacitor is connected to the third end of the first switch module, a second end of the first switch is respectively connected to the second end of the first switch module and the first end of the third switch module, and a third end of the first switch is connected to the first end of the first interface.

3. The battery control circuit according to claim 1, characterized in that: The third switch module includes a second switch, a fourth resistor, a fifth resistor and a first light emitting diode; The first end of the second switch is respectively connected to the first end of the fourth resistor, the first end of the fifth resistor, the anode of the first light-emitting diode, and the third end of the first switch module; the second end of the second switch is respectively connected to the second end of the fourth resistor and the first end of the second interface; the third end of the second switch is respectively connected to the second end of the first switch module and the second end of the second switch module; the second end of the fifth resistor and the cathode of the first light-emitting diode are both grounded.

4. The battery control circuit according to claim 1, characterized in that: The fourth switch module includes a first switch unit and a second switch unit; The first end of the first switch unit is connected to the second end of the first switch module, the second end of the second switch module, and the first end of the third switch module, respectively; the second end of the first switch unit is connected to the first end of the second switch unit; the third end of the first switch unit is grounded; the second end of the second switch unit is connected to the first end of the first interface; and the third end of the second switch unit is connected to the first end of the third interface; The first switch unit is configured to be turned on when the second switch module is turned off; The second switch unit is configured to be turned on when the first switch unit is turned on, so as to establish a connection between the input power source and the first end of the third interface.

5. The battery control circuit according to claim 4, characterized in that: The first switch unit includes a sixth resistor, a seventh resistor and a third switch; The first end of the sixth resistor is respectively connected to the second end of the first switch module, the second end of the second switch module, and the first end of the third switch module; the second end of the sixth resistor is respectively connected to the first end of the third switch and the first end of the seventh resistor; the second end of the third switch is connected to the first end of the second switch unit; the second end of the seventh resistor and the third end of the third switch are both grounded.

6. The battery control circuit according to claim 4, characterized in that: The second switch unit includes an eighth resistor and a fourth switch; The first end of the eighth resistor is connected to the second end of the first switch unit, the second end of the eighth resistor is connected to the first end of the fourth switch, the second end of the fourth switch is connected to the first end of the third interface, and the third end of the fourth switch is connected to the first end of the first interface.

7. The battery control circuit according to claim 4, characterized in that: The battery control circuit further includes a ninth resistor, a tenth resistor, a second light emitting diode, and a third light emitting diode; A first end of the ninth resistor is connected to the first end of the first interface, a second end of the ninth resistor is respectively connected to the first end of the third interface, an anode of the second light-emitting diode, and an anode of the third light-emitting diode, a cathode of the second light-emitting diode is respectively connected to the cathode of the third light-emitting diode and the first end of the tenth resistor, and a second end of the tenth resistor is grounded; The second light emitting diode is configured to light up when the first interface is connected to the input power supply; The third light emitting diode is configured to light up when the second switch unit is turned on.

8. An electronic device, characterized in that: The battery control circuit comprises the battery control circuit according to any one of claims 1 to 7.

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