A battery protection circuit system and electronic device employing a dual-switch structure

Abstract

This utility model discloses a battery protection circuit system and electronic device employing a dual-switch structure. The battery protection circuit system includes a power switch, a control circuit, a trigger circuit, an MCU, and a reset circuit. The power switch is positioned between the battery and the load. The trigger circuit is electrically connected to both the control circuit and the MCU, and the control circuit is electrically connected to both the power switch and the MCU. The trigger circuit is connected to a switching element. When the MCU detects that the switching element is in the on state, the trigger circuit outputs a first trigger signal. The control circuit controls the power switch to turn on according to the first trigger signal, allowing the battery to supply power to the load. The reset circuit is electrically connected to both the battery and the trigger circuit. When the battery's electrical parameters are less than a preset threshold, the reset circuit outputs a reset signal, which invalidates the first trigger signal. This solution can disconnect the battery and load when the battery power is low, preventing over-discharge and thus improving battery life.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to a battery protection circuit system and electronic device employing a dual-switch structure. Background Technology

[0002] Electronic devices typically incorporate switches to control their on / off states. Switches are generally categorized into hard switches and soft switches: hard switches are traditional mechanical or semiconductor switching elements that exhibit distinct on and off states during the switching process; while soft switches are a technique that reduces voltage and current stress on switching elements during switching, achieved through specific circuit design and control strategies.

[0003] During use, a switch controls whether the battery of an electronic device supplies power to the load. However, neither a hard switch nor a soft switch should actively shut down the electronic device when the battery is low, as this could lead to over-discharge of the battery. Utility Model Content

[0004] This invention provides a battery protection circuit system and electronic device with a dual-switch structure, which can disconnect the connection between the battery and the load when the battery power is low, prevent the battery from over-discharging, and thus improve the battery life.

[0005] According to one aspect of this utility model, a battery protection circuit system employing a dual-switch structure is provided, comprising: a power switch, a control circuit, a trigger circuit, a microcontroller unit (MCU), and a reset circuit; wherein,

[0006] The power switch is located between the battery and the load;

[0007] The trigger circuit is electrically connected to the control circuit and the MCU respectively. The control circuit is electrically connected to the power switch and the MCU respectively. The trigger circuit is connected to the switching element. When the MCU detects that the switching element is in the open state, the trigger circuit outputs a first trigger signal. The control circuit is used to control the power switch to turn on according to the first trigger signal so that the battery can supply power to the load.

[0008] The reset circuit is electrically connected to both the battery and the trigger circuit. When the battery's electrical parameters are less than a preset threshold, the reset circuit outputs a reset signal, which is used to invalidate the first trigger signal.

[0009] Optionally, it may also include: a switching circuit; wherein,

[0010] The switching circuit is located between the power switch and the battery, and it is also connected to a non-battery power source. The switching circuit is used to switch between battery power and non-battery power.

[0011] The control circuit is also connected to a non-battery power source.

[0012] Optionally, the switching circuit includes: a first switching transistor, a first diode, a first resistor, a second resistor, a first capacitor, a second capacitor, and a first transient voltage suppression diode;

[0013] One end of the first resistor is connected to a non-battery power source, the other end of the first resistor is electrically connected to one end of the second resistor, and the other end of the second resistor is grounded.

[0014] The first pin of the first switching transistor is electrically connected to one end of the second resistor, the second pin of the first switching transistor is electrically connected to the output terminal of the first diode, and the third pin of the first switching transistor is connected to the battery.

[0015] The input terminal of the first diode is connected to a non-battery power source, and the output terminal of the first diode is electrically connected to a power switch.

[0016] One end of the first capacitor is connected to the battery, and the other end of the first capacitor is grounded.

[0017] One end of the second capacitor is electrically connected to the third pin of the first switching transistor, and the other end of the second capacitor is grounded.

[0018] One end of the first transient voltage suppression diode is connected to the battery, and the other end of the first transient voltage suppression diode is grounded.

[0019] Optionally, the switching circuit may also include a ferrite bead; the ferrite bead is disposed between the battery and the third pin of the first switching transistor.

[0020] Optionally, the power switch includes: a third resistor, a fourth resistor, and a second switching transistor;

[0021] One end of the third resistor is electrically connected to the switching circuit, the other end of the third resistor is electrically connected to one end of the fourth resistor, and the other end of the fourth resistor is electrically connected to the control circuit.

[0022] The first pin of the second switch is electrically connected to the other end of the third resistor, the second pin of the second switch is electrically connected to one end of the third resistor, and the third pin of the second switch is connected to the load.

[0023] Optionally, the control circuit includes: a third switching transistor, a fifth resistor, a third capacitor, a sixth resistor, a seventh resistor, an eighth resistor, a second diode, a third diode, and a fourth diode;

[0024] The first pin of the third switch is electrically connected to one end of the fifth resistor, the second pin of the third switch is grounded, the third pin of the third switch is electrically connected to the power switch, and the other end of the fifth resistor is grounded.

[0025] One end of the third capacitor is electrically connected to one end of the fifth resistor, and the other end of the third capacitor is electrically connected to the other end of the fifth resistor.

[0026] The input terminal of the second diode is connected to a non-battery power source, the output terminal of the second diode is electrically connected to one end of the sixth resistor, and the other end of the sixth resistor is electrically connected to one end of the fifth resistor.

[0027] The input terminal of the third diode is electrically connected to the MCU, the output terminal of the third diode is electrically connected to one end of the seventh resistor, and the other end of the seventh resistor is electrically connected to one end of the fifth resistor.

[0028] The input terminal of the fourth diode is electrically connected to the reset circuit and the trigger circuit, respectively. The output terminal of the fourth diode is electrically connected to one end of the eighth resistor, and the other end of the eighth resistor is electrically connected to one end of the fifth resistor.

[0029] Optionally, the trigger circuit includes: a fourth switching transistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fifth diode, a sixth diode, a fourth capacitor, and a second transient voltage suppression diode;

[0030] The first pin of the fourth switching transistor is electrically connected to the input terminal of the fifth diode, the second pin of the fourth switching transistor is electrically connected to the power switch and the switching circuit respectively, the third pin of the fourth switching transistor is electrically connected to one end of the ninth resistor, and the other end of the ninth resistor is electrically connected to the control circuit.

[0031] One end of the tenth resistor is electrically connected to the second pin of the fourth switch, and the other end of the tenth resistor is electrically connected to the first pin of the fourth switch.

[0032] The output terminal of the fifth diode is electrically connected to one end of the eleventh resistor, the other end of the eleventh resistor is connected to one pin of the switching element, and the other pin of the switching element is grounded.

[0033] The input terminal of the sixth diode is electrically connected to the MCU, and the output terminal of the sixth diode is electrically connected to one end of the eleventh resistor.

[0034] One end of the fourth capacitor is connected to a pin of the switching element, and the other end of the fourth capacitor is grounded.

[0035] One end of the second transient voltage suppressor diode is connected to a pin of the switching element, and the other end of the second transient voltage suppressor diode is grounded.

[0036] Optionally, the reset circuit includes: a reset chip, a first voltage divider resistor, and a second voltage divider resistor;

[0037] The first pin of the reset chip is electrically connected to the control circuit, the second pin of the reset chip is grounded, the third pin of the reset chip is electrically connected to one end of the first voltage divider resistor, and the other end of the first voltage divider resistor is connected to the battery.

[0038] One end of the second voltage divider resistor is electrically connected to one end of the first voltage divider resistor, and the other end of the second voltage divider resistor is grounded.

[0039] Optionally, the reset circuit may also include an inverter; the inverter is disposed between the control circuit and the first pin of the reset chip.

[0040] According to another aspect of the present invention, an electronic device is provided, including a battery, a load, a switching element, and a battery protection circuit system employing a dual-switch structure in any of the above embodiments.

[0041] The technical solution of this utility model embodiment involves designing a battery protection circuit system with a dual-switch structure. This system includes a power switch, a control circuit, a trigger circuit, a microcontroller unit (MCU), and a reset circuit. On one hand, when the MCU detects that the switching element is in the on state, the trigger circuit outputs a first trigger signal. The control circuit then controls the power switch to turn on based on this first trigger signal, allowing the battery to supply power to the load. This achieves the function of connecting the battery and the load through the switching element, ensuring the normal operation of the electronic device. On the other hand, when the battery's electrical parameters are less than a preset threshold (e.g., when the battery charge is too low), the reset circuit outputs a reset signal, which invalidates the first trigger signal. Thus, even if the switching element is in the on state, the first trigger signal can still be shielded by the reset signal. Since the control circuit no longer receives the first trigger signal, it controls the power switch to turn off, disconnecting the circuit between the battery and the load. This prevents the battery from over-discharging and extends its lifespan.

[0042] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of a battery protection circuit system with a dual-switch structure provided in Embodiment 1 of this utility model;

[0045] Figure 2This is a schematic diagram of another battery protection circuit system with a dual-switch structure provided in Embodiment 1 of this utility model;

[0046] Figure 3 This is a circuit diagram of a battery protection circuit system with a dual-switch structure provided in Embodiment 1 of this utility model. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0048] It should be noted that the use of terms such as "first" and "second" to describe various components in this invention is for distinguishing different objects, not for defining a specific order, and these components should not be limited by these terms. These terms are only used to distinguish one component from another. Furthermore, unless the context clearly indicates otherwise, the singular forms "a," "an," and "the" are also intended to include the plural forms. Additionally, unless explicitly stated otherwise, the words "comprising" and variations such as "including" or "having" will be understood to imply inclusion of the element, but do not exclude any other elements.

[0049] Example 1

[0050] Figure 1 This is a schematic diagram of a battery protection circuit system employing a dual-switch structure, provided in Embodiment 1 of this utility model. The battery protection circuit system employing a dual-switch structure is installed in an electronic device containing a battery to protect the battery. Figure 1 As shown, the battery protection circuit system 10 with a dual-switch structure includes: a power switch 101, a control circuit 102, a trigger circuit 103, an MCU 104, and a reset circuit 105.

[0051] A power switch 101 is located between the battery 21 and the load 30. The battery 21 supplies power to the load 30, and the power switch 101 controls the connection and disconnection of the circuit between the battery 21 and the load 30. Specifically, when the power switch 101 is on, it indicates that the power switch 101 is working, and the circuit between the battery 21 and the load 30 is connected; when the power switch 101 is off, it indicates that the power switch 101 is not working, and the circuit between the battery 21 and the load 30 is disconnected.

[0052] Trigger circuit 103 is electrically connected to control circuit 102 and MCU 104 respectively. Control circuit 102 is electrically connected to power switch 101 and MCU 104 respectively. Trigger circuit 103 is connected to switching element 40. Switching element 40 is a user-triggered element. Switching element 40 can be a hard switch (such as a toggle switch) installed on the surface of electronic device, a soft switch, or a device that can realize switching function.

[0053] The MCU 104 can detect the state of the switching element 40. When the MCU 104 detects that the switching element 40 is in the on state, the trigger circuit 103 outputs a first trigger signal to the control circuit 102. The control circuit 102 controls the power switch 101 to turn on according to the first trigger signal, so that the battery 21 supplies power to the load 30. This achieves the function of connecting the battery 21 and the load 30 through the switching element 40, ensuring the normal operation of the electronic device.

[0054] In one embodiment, the MCU 104 may also output a second trigger signal to the control circuit 102, which controls the power switch 101 to turn on according to the second trigger signal, so that the battery 21 supplies power to the load 30. In this solution, the MCU 104 can control the circuit between the battery 21 and the load 30 to conduct, without user operation.

[0055] Optionally, the MCU 104 can be electrically connected to the load 30 to enable real-time monitoring of the status of the load 30 and control of the load 30, thereby ensuring the safe operation of the electronic equipment.

[0056] The reset circuit 105 is electrically connected to both the battery 21 and the trigger circuit 103. When the electrical parameters of the battery 21 are less than a preset threshold, the reset circuit 105 outputs a reset signal, which is used to invalidate the first trigger signal.

[0057] In this invention, the electrical parameters of battery 21 can be either the remaining charge of battery 21 or the output voltage / current of battery 21. When the electrical parameter of battery 21 is the remaining charge of battery 21, the preset threshold refers to the preset charge of battery 21; when the electrical parameter of battery 21 is the output voltage / current of battery 21, the preset threshold refers to the preset voltage / current of battery 21.

[0058] If the electrical parameters of battery 21 are less than a preset threshold, it indicates that battery 21 is no longer suitable for supplying power to load 30. If it continues to supply power to load 30, it may cause battery 21 to over-discharge. Therefore, the reset circuit 105 outputs a reset signal. At this time, even if the switching element 40 is in the open state, the first trigger signal can still be shielded by the reset signal. The control circuit 102 no longer receives the first trigger signal, so it can control the power switch 101 to turn off, and the circuit between battery 21 and load 30 is broken. This achieves the purpose of preventing battery 21 from over-discharging and improving the service life of battery 21.

[0059] In one embodiment, Figure 2 This is a schematic diagram of another battery protection circuit system employing a dual-switch structure, provided in Embodiment 1 of this utility model. Figure 2 As shown, the electronic device may have a power source other than battery 21, i.e., a non-battery power source 22. The battery protection circuit system 10, which employs a dual-switch structure, also includes a switching circuit 106.

[0060] The switching circuit 106 is located between the power switch 101 and the battery 21. The switching circuit 106 is also connected to a non-battery power source 22, meaning that the switching circuit 106 is also located between the power switch 101 and the non-battery power source 22. The non-battery power source 22 can be any power source other than the battery 21, such as Universal Serial Bus (USB) power, AC power, DC power, etc.

[0061] The switching circuit 106 is used to switch between battery power supply and non-battery power supply. When the switching circuit 106 switches to battery power supply, the power switch 101 is turned on to make the circuit between battery 21 and load 30 conduct, and the power switch 101 is turned off to make the circuit between battery 21 and load 30 disconnect. When the switching circuit 106 switches to non-battery power supply, the power switch 101 is turned on to make the circuit between non-battery power supply 22 and load 30 conduct, and the power switch 101 is turned off to make the circuit between non-battery power supply 22 and load 30 disconnect.

[0062] The control circuit 102 is also connected to the non-battery power source 22. The control circuit 102 is used to control the power switch 101 to turn on according to the signal from the non-battery power source 22, so that the non-battery power source 22 supplies power to the load 30. In this scheme, since the non-battery power source 22 supplies power to the load 30, the circuit between the battery 21 and the load 30 is always in an open state, the battery 21 does not consume power, and the battery 21 will not have a problem of continuous discharge.

[0063] Furthermore, this utility model further refines the specific structure of the circuit. Figure 3 This is a circuit diagram of a battery protection circuit system with a dual-switch structure provided in Embodiment 1 of this utility model.

[0064] The switching circuit 106 includes: a first switching transistor Q1, a first diode D1, a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, and a first transient voltage suppression diode ESD1.

[0065] One end of the first resistor R1 is connected to the non-battery power supply U5V, and the other end of the first resistor R1 is electrically connected to one end of the second resistor R2, the other end of the second resistor R2 is grounded. The first pin of the first switch Q1 is electrically connected to one end of the second resistor R2, the second pin of the first switch Q1 is electrically connected to the output of the first diode D1, and the third pin of the first switch Q1 is connected to the battery B+. The input of the first diode D1 is connected to the non-battery power supply U5V, and the output of the first diode D1 is electrically connected to the power switch 101. One end of the first capacitor C1 is connected to the battery B+, and the other end of the first capacitor C1 is grounded; one end of the second capacitor C2 is electrically connected to the third pin of the first switch Q1, and the other end of the second capacitor C2 is grounded; one end of the first transient voltage suppression diode ESD1 is connected to the battery B+, and the other end of the first transient voltage suppression diode ESD1 is grounded.

[0066] The first switching transistor Q1 can be a P-type metal-oxide-semiconductor field-effect transistor (MOSFET), or simply a PMOS transistor.

[0067] In one embodiment, the switching circuit 106 may further include a ferrite bead B1; the ferrite bead B1 is disposed between the battery B+ and the third pin of the first switching transistor Q1. Further, one end of the first capacitor C1 is connected to both the battery B+ and the ferrite bead B1, and one end of the second capacitor C2 is connected to both the third pin of the first switching transistor Q1 and the ferrite bead B1. The ferrite bead B1 is used to improve the anti-interference performance of the battery protection circuit system employing a dual-switch structure.

[0068] The power switch 101 includes: a third resistor R3, a fourth resistor R4, and a second switching transistor Q2.

[0069] One end of the third resistor R3 is electrically connected to the second pin of the first switch Q1 and the output terminal of the first diode D1 in the switching circuit 106. The other end of the third resistor R3 is electrically connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is electrically connected to the control circuit 102. The first pin of the second switch Q2 is electrically connected to the other end of the third resistor R3, the second pin of the second switch Q2 is electrically connected to one end of the third resistor R3, and the third pin of the second switch Q2 is connected to the load 30.

[0070] The second switch Q2 can be a PMOS transistor.

[0071] Combination Figure 3 It can be seen that the output of the switching circuit 106 is the power input UBAT of the power switch 101, and the power output VBAT of the power switch 101 is the power supply for the load 30.

[0072] The control circuit 102 includes: a third switch Q3, a fifth resistor R5, a third capacitor C3, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second diode D2, a third diode D3, and a fourth diode D4.

[0073] The first pin of the third switch Q3 is electrically connected to one end of the fifth resistor R5, the second pin of the third switch Q3 is grounded, and the third pin of the third switch Q3 is electrically connected to the other end of the fourth resistor R4 of the power switch 101. The other end of the fifth resistor R5 is grounded. One end of the third capacitor C3 is electrically connected to one end of the fifth resistor R5, and the other end of the third capacitor C3 is electrically connected to the other end of the fifth resistor R5. The input of the second diode D2 is connected to the non-battery power supply U5V, and the output of the second diode D2 is electrically connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is electrically connected to one end of the fifth resistor R5. The input of the third diode D3 is electrically connected to the MCU 104, and the output of the third diode D3 is electrically connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is electrically connected to one end of the fifth resistor R5. The input of the third diode D3 can receive the POWER_LOCK signal (i.e., the second trigger signal) from the MCU 104. The input terminal of the fourth diode D4 is electrically connected to the reset circuit 105 and the trigger circuit 103 respectively. The output terminal of the fourth diode D4 is electrically connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is electrically connected to one end of the fifth resistor R5.

[0074] The third switch Q3 can be an N-type MOSFET, or NMOS transistor for short. The first pin of the third switch Q3 is the gate (G) of the NMOS transistor, the second pin is the source (S) of the NMOS transistor, and the third pin is the drain (D) of the NMOS transistor.

[0075] The trigger circuit 103 includes: a fourth switch Q4, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a fifth diode D5, a sixth diode D6, a fourth capacitor C4, and a second transient voltage suppression diode ESD2.

[0076] The first pin of the fourth switch Q4 is electrically connected to the input terminal of the fifth diode D5. The second pin of the fourth switch Q4 is electrically connected to both the power switch 101 and the switching circuit 106 (i.e., connected to the power input UBAT of the power switch 101). The third pin of the fourth switch Q4 is electrically connected to one end of the ninth resistor R9, and the other end of the ninth resistor R9 is electrically connected to the input terminal of the fourth diode D4 in the control circuit 101. One end of the tenth resistor R10 is electrically connected to the second pin of the fourth switch Q2, and the other end of the tenth resistor R10 is electrically connected to the first pin of the fourth switch Q4. The output terminal of the fifth diode D5 is electrically connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to one pin of the switching element 40, the other pin of the switching element 40 is grounded. The input terminal of the sixth diode D6 is electrically connected to the MCU 104, and the output terminal of the sixth diode D6 is electrically connected to one end of the eleventh resistor R11. The input of the sixth diode D6 can receive the POWER_KEY signal from the MCU 104, which is used to detect the state of the switching element 40. One end of the fourth capacitor C4 is connected to one pin of the switching element 40, and the other end of the fourth capacitor C4 is grounded. One end of the second transient voltage suppression diode ESD2 is connected to one pin of the switching element 40, and the other end of the second transient voltage suppression diode ESD2 is grounded.

[0077] Optionally, the switching element 40 may include more than two pins, meaning the number of pins in the switching element 40 may be greater than two. In this case, in addition to the two pins mentioned above, the remaining pins may be reserved pins or grounded pins.

[0078] The reset circuit 105 includes: a reset chip IC, a first voltage divider resistor R12, and a second voltage divider resistor R13.

[0079] The first pin of the reset chip IC is electrically connected to the input terminal of the fourth diode D4 of the control circuit 102. The second pin of the reset chip IC is grounded. The third pin of the reset chip IC is electrically connected to one end of the first voltage divider resistor R12, and the other end of the first voltage divider resistor R12 is connected to the battery B+. One end of the second voltage divider resistor R13 is electrically connected to one end of the first voltage divider resistor R12, and the other end of the second voltage divider resistor R13 is grounded.

[0080] The working principle of the reset circuit 105 is as follows: the output voltage of battery B+ is divided by the first voltage divider resistor R12 and the second voltage divider resistor R13 and then supplied to the reset chip IC. When the voltage supplied to the reset chip IC is less than the threshold (i.e., the preset threshold) of the reset chip IC, the reset chip IC outputs a reset level (i.e., a reset signal), which invalidates the first trigger signal. At this time, even if the switching element 40 is in the open state, the first trigger signal can still be shielded by the reset signal. The control circuit 102 no longer receives the first trigger signal, thus controlling the power switch 101 to turn off, disconnecting the circuit between battery 21 and load 30, thereby preventing over-discharge of battery 21 and improving the service life of battery 21.

[0081] In one embodiment, the resistance values ​​of the first voltage divider resistor R12 and the second voltage divider resistor R13 can be adjusted according to the threshold value of the selected reset chip IC. The threshold value of the reset chip IC can also be set according to actual needs.

[0082] Optionally, the reset chip IC can be a U5 chip.

[0083] It is understandable that when the output level of the reset circuit 105 is the same as the conduction level of the third switch Q3 of the control circuit 102, such as Figure 3 When the reset circuit 105 outputs a high level and the third switch Q3 is high and conducting, it can be directly used. Figure 3 The battery protection circuit system shown operates using a dual-switch structure.

[0084] When the output level of the reset circuit 105 is inconsistent with the conduction level of the third switch Q3 of the control circuit 102, in order for the battery protection circuit system with a dual-switch structure to function properly, in another optional implementation, it is possible to... Figure 3 Based on the battery protection circuit system with a dual-switch structure shown, an inverter V1 is added to the reset circuit 105. Specifically, the inverter V1 is located between the input terminal of the fourth diode D4 in the control circuit 102 and the first pin of the reset chip IC.

[0085] The inverter V1 controls the level of the reset circuit, ensuring that the output level of the reset circuit 105 matches the conduction level of the third switch Q3 in the control circuit 102, thus meeting the reset level requirements of the battery protection circuit system with a dual-switch structure.

[0086] The technical solution of this utility model embodiment involves designing a battery protection circuit system with a dual-switch structure. This system includes a power switch, a control circuit, a trigger circuit, an MCU, and a reset circuit. On one hand, when the MCU detects that the switching element is in the on state, the trigger circuit outputs a first trigger signal. The control circuit then controls the power switch to turn on based on this first trigger signal, allowing the battery to supply power to the load. This achieves the function of connecting the battery and the load through the switching element, ensuring the normal operation of the electronic device. On the other hand, when the battery's electrical parameters are less than a preset threshold (e.g., when the battery charge is too low), the reset circuit outputs a reset signal, which invalidates the first trigger signal. Thus, even if the switching element is in the on state, the first trigger signal can still be shielded by the reset signal. Since the control circuit no longer receives the first trigger signal, it controls the power switch to turn off, disconnecting the circuit between the battery and the load. This prevents the battery from over-discharging and extends its lifespan.

[0087] Example 2

[0088] This utility model embodiment also provides an electronic device. The electronic device includes the battery protection circuit system with a dual-switch structure as described in the above embodiments, and also includes a battery, a load, and a switching element. The specific structure of the battery protection circuit system with a dual-switch structure and its connection relationship with the battery, load, and switching element can be referred to the description of Embodiment 1 above, and will not be repeated here for the sake of brevity.

[0089] In one embodiment, the electronic device may be a wireless microphone.

[0090] The technical solution of this utility model embodiment includes a battery protection circuit system with a dual-switch structure in the electronic device. This dual-switch battery protection circuit system comprises a power switch, a control circuit, a trigger circuit, an MCU, and a reset circuit. On one hand, when the MCU detects that the switching element is in the on state, the trigger circuit outputs a first trigger signal. The control circuit controls the power switch to turn on according to the first trigger signal, allowing the battery to supply power to the load. This achieves the function of connecting the battery and the load through the switching element, ensuring the normal operation of the electronic device. On the other hand, when the battery's electrical parameters are less than a preset threshold (e.g., when the battery charge is too low), the reset circuit outputs a reset signal, which invalidates the first trigger signal. Thus, even if the switching element is in the on state, the first trigger signal can still be shielded by the reset signal. Since the control circuit no longer receives the first trigger signal, it controls the power switch to turn off, disconnecting the circuit between the battery and the load. That is, the battery no longer supplies power to the load, achieving the purpose of preventing battery over-discharge and improving battery life.

[0091] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A battery protection circuit system employing a dual-switch structure, characterized in that, include: Power switch, control circuit, trigger circuit, microcontroller unit (MCU), and reset circuit; among which, The power switch is located between the battery and the load; The trigger circuit is electrically connected to the control circuit and the MCU respectively. The control circuit is electrically connected to the power switch and the MCU respectively. The trigger circuit is connected to the switching element. When the MCU detects that the switching element is in the open state, the trigger circuit outputs a first trigger signal. The control circuit is used to control the power switch to open according to the first trigger signal so that the battery supplies power to the load. The reset circuit is electrically connected to both the battery and the trigger circuit. When the electrical parameters of the battery are less than a preset threshold, the reset circuit outputs a reset signal, which is used to invalidate the first trigger signal.

2. The battery protection circuitry employing a dual switch structure according to claim 1, characterized by, Also includes: Switching circuit; among which, The switching circuit is disposed between the power switch and the battery, and the switching circuit is also connected to a non-battery power source; the switching circuit is used to switch between battery power supply and non-battery power supply. The control circuit is also connected to the non-battery power source.

3. The battery protection circuitry employing a dual switch structure according to claim 2, characterized by, The switching circuit includes: a first switching transistor, a first diode, a first resistor, a second resistor, a first capacitor, a second capacitor, and a first transient voltage suppression diode; One end of the first resistor is connected to the non-battery power source, the other end of the first resistor is electrically connected to one end of the second resistor, and the other end of the second resistor is grounded; The first pin of the first switch is electrically connected to one end of the second resistor, the second pin of the first switch is electrically connected to the output terminal of the first diode, and the third pin of the first switch is connected to the battery. The input terminal of the first diode is connected to the non-battery power source, and the output terminal of the first diode is electrically connected to the power switch. One end of the first capacitor is connected to the battery, and the other end of the first capacitor is grounded; One end of the second capacitor is electrically connected to the third pin of the first switching transistor, and the other end of the second capacitor is grounded; One end of the first transient voltage suppression diode is connected to the battery, and the other end of the first transient voltage suppression diode is grounded.

4. The battery protection circuitry employing a dual switch structure according to claim 3, wherein, The switching circuit further includes a magnetic bead; the magnetic bead is disposed between the battery and the third pin of the first switching transistor.

5. The battery protection circuitry employing a dual switch structure according to claim 2, wherein, The power switch includes: a third resistor, a fourth resistor, and a second switching transistor; One end of the third resistor is electrically connected to the switching circuit, the other end of the third resistor is electrically connected to one end of the fourth resistor, and the other end of the fourth resistor is electrically connected to the control circuit. The first pin of the second switch is electrically connected to the other end of the third resistor, the second pin of the second switch is electrically connected to one end of the third resistor, and the third pin of the second switch is connected to the load.

6. The battery protection circuitry employing a dual switch structure according to claim 2, wherein The control circuit includes: a third switching transistor, a fifth resistor, a third capacitor, a sixth resistor, a seventh resistor, an eighth resistor, a second diode, a third diode, and a fourth diode; The first pin of the third switch is electrically connected to one end of the fifth resistor, the second pin of the third switch is grounded, the third pin of the third switch is electrically connected to the power switch, and the other end of the fifth resistor is grounded. One end of the third capacitor is electrically connected to one end of the fifth resistor, and the other end of the third capacitor is electrically connected to the other end of the fifth resistor; The input terminal of the second diode is connected to the non-battery power source, the output terminal of the second diode is electrically connected to one end of the sixth resistor, and the other end of the sixth resistor is electrically connected to one end of the fifth resistor. The input terminal of the third diode is electrically connected to the MCU, the output terminal of the third diode is electrically connected to one end of the seventh resistor, and the other end of the seventh resistor is electrically connected to one end of the fifth resistor. The input terminal of the fourth diode is electrically connected to the reset circuit and the trigger circuit, respectively. The output terminal of the fourth diode is electrically connected to one end of the eighth resistor, and the other end of the eighth resistor is electrically connected to one end of the fifth resistor.

7. The battery protection circuitry employing a dual switch structure according to claim 2, wherein The trigger circuit includes: a fourth switching transistor, a ninth resistor, a tenth resistor, an eleventh resistor, a fifth diode, a sixth diode, a fourth capacitor, and a second transient voltage suppression diode; The first pin of the fourth switch is electrically connected to the input terminal of the fifth diode, the second pin of the fourth switch is electrically connected to the power switch and the switching circuit respectively, the third pin of the fourth switch is electrically connected to one end of the ninth resistor, and the other end of the ninth resistor is electrically connected to the control circuit. One end of the tenth resistor is electrically connected to the second pin of the fourth switch, and the other end of the tenth resistor is electrically connected to the first pin of the fourth switch. The output terminal of the fifth diode is electrically connected to one end of the eleventh resistor, the other end of the eleventh resistor is connected to one pin of the switching element, and the other pin of the switching element is grounded; The input terminal of the sixth diode is electrically connected to the MCU, and the output terminal of the sixth diode is electrically connected to one end of the eleventh resistor. One end of the fourth capacitor is connected to one pin of the switching element, and the other end of the fourth capacitor is grounded. One end of the second transient voltage suppression diode is connected to one pin of the switching element, and the other end of the second transient voltage suppression diode is grounded.

8. The battery protection circuitry employing a dual switch structure according to claim 2, wherein, The reset circuit includes: a reset chip, a first voltage divider resistor, and a second voltage divider resistor; The first pin of the reset chip is electrically connected to the control circuit, the second pin of the reset chip is grounded, the third pin of the reset chip is electrically connected to one end of the first voltage divider resistor, and the other end of the first voltage divider resistor is connected to the battery. One end of the second voltage divider resistor is electrically connected to one end of the first voltage divider resistor, and the other end of the second voltage divider resistor is grounded.

9. The battery protection circuitry employing a dual switch structure according to claim 8, wherein, The reset circuit further includes an inverter; the inverter is disposed between the control circuit and the first pin of the reset chip.

10. An electronic device, comprising: The battery protection circuit system with the double-switch structure according to any one of claims 1-9 is included in a battery, a load, a switching element, and the like.

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