Battery protection circuit and electronic equipment

Abstract

The utility model provides a battery protection circuit and electronic equipment, and belongs to the technical field of electronics. The circuit comprises an energy storage unit, a protection unit, a switch unit, a current detection unit and a processing unit, the positive electrode of the energy storage unit is connected with the first end of the protection unit and the first end of the current detection unit. The second end of the protection unit is connected with the first end of the switch unit, and the third end of the protection unit is connected with the first control end of the processing unit; the second end of the switch unit is connected with the second end of the current detection unit, and the third end of the switch unit is connected with the second control end of the processing unit; the third end of the current detection unit is connected with the input end of the processing unit. The possibility that the protection unit is mistakenly disconnected and permanent failure protection is mistakenly triggered by the circuit can be reduced, and then the reliability and accuracy of the circuit for protecting the energy storage unit can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to a battery protection circuit and an electronic device. BACKGROUND

[0002] With the development of electronic technology, various kinds of portable electronic devices have been popularized in thousands of households. These portable electronic devices generally have energy storage devices such as batteries and corresponding battery protection devices, and can cut off the battery power supply circuit through the battery protection device when the battery has overcurrent, overvoltage and other conditions.

[0003] In related technologies, an electric quantity meter, a controllable switch and a fuse can generally be provided in these electronic devices. When overcurrent or overvoltage protection occurs, the electric quantity meter can be used to detect the current flowing through the sampling resistor in the circuit. After the controllable switch is turned off, if the electric quantity meter can still detect that there is current flowing through the sampling resistor, the fuse is blown to trigger permanent failure protection.

[0004] However, in actual application, interference may occur in the circuit, so that the electric quantity meter receives an incorrect current signal, thereby causing misoperation or false triggering of the fuse. Therefore, the related art has the problem of low reliability of circuit protection. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a battery protection circuit and an electronic device, which can reduce the possibility of false disconnection of the protection unit and false triggering of the permanent failure protection, thereby improving the reliability and accuracy of the circuit in protecting the energy storage unit.

[0006] Embodiments of the present application are implemented as follows:

[0007] In a first aspect, the present application provides a battery protection circuit, which includes an energy storage unit, a protection unit, a switch unit, a current detection unit and a processing unit.

[0008] The positive electrode of the energy storage unit is connected to the first end of the protection unit and the first end of the current detection unit, and the negative electrode of the energy storage unit is used as the negative output end of the circuit.

[0009] The second end of the protection unit is connected to the first end of the switch unit, and the third end of the protection unit is connected to the first control end of the processing unit. The protection unit is used to act under the action of the processing unit to disconnect the output circuit of the energy storage unit.

[0010] The second end of the switch unit is connected with the second end of the current detection unit, and the third end of the switch unit is connected with the second control end of the processing unit; the switch unit is used for being turned on or turned off under the action of the processing unit, and the current output by the energy storage unit is output to the current detection unit when the switch unit is turned on;

[0011] The third end of the current detection unit is connected with the input end of the processing unit, and the fourth end of the current detection unit is used as the positive output end of the circuit; the current detection unit is used for detecting the first current output by the energy storage unit and outputting the first current to the processing unit;

[0012] The processing unit is used for controlling the protection unit to act under the action of the first current.

[0013] Optionally, the current detection unit comprises a Hall current sensor and a signal conversion unit.

[0014] The power supply end of the Hall current sensor is connected with the positive pole of the energy storage unit, the input end of the Hall current sensor is connected with the second end of the switch unit, the first output end of the Hall current sensor is connected with the input end of the signal conversion unit, and the second output end of the Hall current sensor is used as the positive output end of the circuit; the Hall current sensor is used for converting the current input by the switch unit into a voltage signal and outputting the voltage signal to the signal conversion unit;

[0015] The output end of the signal conversion unit is connected with the input end of the processing unit; the signal conversion unit is used for converting the voltage signal into a digital signal and outputting the digital signal to the processing unit, and the digital signal is used for indicating the size of the first current.

[0016] Optionally, the current detection unit further comprises at least a current limiting resistor.

[0017] The current limiting resistor is connected between the first output end of the Hall current sensor and the input end of the signal conversion unit.

[0018] Optionally, the protection unit comprises a fuse and a first switch tube.

[0019] The first end of the fuse is connected with the positive pole of the energy storage unit, the second end of the fuse is connected with the first end of the switch unit, and the third end of the fuse is connected with the source electrode of the first switch tube.

[0020] The gate of the first switch tube is connected with the first control end of the processing unit, and the drain of the first switch tube is grounded; the first switch tube is used to be turned on under the action of the processing unit to supply power to the fuse;

[0021] The fuse is used to be heated and fused under the condition that the first switch tube is turned on.

[0022] Optionally, the switch unit comprises at least one switch device;

[0023] Each of the switch devices is connected between the second end of the protection unit and the second end of the current detection unit, and each of the switch devices is connected in series.

[0024] The control end of each of the switch devices is connected with the second control end of the processing unit respectively;

[0025] Each of the switch devices is used to be turned on or turned off under the control of the processing unit.

[0026] Optionally, each of the switch devices specifically comprises a second switch tube and a third switch tube.

[0027] Optionally, the circuit further comprises a sampling resistor;

[0028] The negative pole of the energy storage unit is connected with the first end of the sampling resistor, and the second end of the sampling resistor is used as the negative output end of the circuit;

[0029] The first sampling end and the second sampling end of the processing unit are connected with the first end and the second end of the sampling resistor respectively; the processing unit is used to detect the second current flowing through the sampling resistor and control the protection unit to act under the action of the first current, the second current and / or the switch state of the switch unit.

[0030] Optionally, the processing unit is a power meter, and the energy storage unit is a battery.

[0031] Optionally, the circuit further comprises a voltage stabilizing unit;

[0032] The input end of the voltage stabilizing unit is connected with the positive pole of the energy storage unit, and the output end of the voltage stabilizing unit is connected with the first end of the current detection unit;

[0033] The voltage stabilizing unit is used to convert the voltage output by the energy storage unit into a working voltage of a preset voltage level and output the working voltage to the current detection unit.

[0034] In a second aspect, the embodiment of the application provides an electronic device, which at least comprises the battery protection circuit in the first aspect.

[0035] The beneficial effects of the embodiments of the present application include:

[0036] The battery protection circuit provided by the embodiments of the present application comprises an energy storage unit, a protection unit, a switch unit, a current detection unit and a processing unit. Specifically, the positive electrode of the energy storage unit is connected with the first end of the protection unit and the first end of the current detection unit respectively, the second end of the protection unit is connected with the first end of the switch unit, and the third end of the protection unit is connected with the first control end of the processing unit. The second end of the switch unit is connected with the second end of the current detection unit, the third end of the switch unit is connected with the second control end of the processing unit, and the third end of the current detection unit is connected with the input end of the processing unit. In addition, the negative electrode of the energy storage unit is used as the negative output end of the circuit, and the fourth end of the current detection unit is used as the positive output end of the circuit.

[0037] The current detection unit can accurately detect the first current output by the energy storage unit when the switch unit is off or closed. The processing unit can control the protection unit according to the current value of the first current, so as to ensure that the protection unit is disconnected to trigger the permanent failure protection only when the switch unit is closed and the first current detected by the current detection unit is not 0, that is, only when it is determined that the switch unit fails or cannot be completely closed.

[0038] In this way, the possibility of mistakenly disconnecting the protection unit and mistakenly triggering the permanent failure protection of the circuit can be reduced, and the reliability and accuracy of the circuit for protecting the energy storage unit can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0040] Figure 1 The structure diagram of the first battery protection circuit provided by the embodiments of the present application;

[0041] Figure 2 The structure diagram of the second battery protection circuit provided by the embodiments of the present application;

[0042] Figure 3 The structure diagram of the third battery protection circuit provided by the embodiments of the present application;

[0043] Figure 4 The structure diagram of the fourth battery protection circuit provided by the embodiments of the present application;

[0044] Figure 5 A structure schematic diagram of a fifth battery protection circuit provided by an embodiment of the present application is shown in the following figure.

[0045] Figure 6 A structure schematic diagram of a sixth battery protection circuit provided by an embodiment of the present application is shown in the following figure.

[0046] Figure 7 A structure schematic diagram of an electronic device provided by an embodiment of the present application is shown in the following figure. DETAILED DESCRIPTION

[0047] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present application.

[0049] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0050] In the description of the present application, it should be noted that the terms "first", "second", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "setting", "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0052] In the related art, an ammeter, a controllable switch and a fuse can be generally arranged in the electronic device, and in the case of protection such as overcurrent or overvoltage, the ammeter can be specifically used to detect the current flowing through the sampling resistor in the circuit, and after the controllable switch is turned off, if the ammeter can still detect the current flowing through the sampling resistor, the fuse is blown to trigger the permanent failure protection.

[0053] However, in actual application, interference may occur in the circuit, so that the ammeter receives an incorrect current signal, thereby causing misoperation or mis-triggering of the fuse. Therefore, the related art solution has the problem of low reliability of circuit protection.

[0054] To this end, the embodiments of the present application provide a battery protection circuit, which comprises an energy storage unit, a protection unit, a switch unit, a current detection unit and a processing unit. Specifically, the positive electrode of the energy storage unit is connected to the first end of the protection unit and the first end of the current detection unit, the second end of the protection unit is connected to the first end of the switch unit, the third end of the protection unit is connected to the first control end of the processing unit, the second end of the switch unit is connected to the second end of the current detection unit, the third end of the switch unit is connected to the second control end of the processing unit, the third end of the current detection unit is connected to the input end of the processing unit, and the fourth end of the current detection unit is connected to the positive output end of the circuit and the negative electrode of the energy storage unit is connected to the negative output end of the circuit. In this way, the possibility of mis-turning off the protection unit and mis-triggering the permanent failure protection can be reduced, thereby improving the reliability and accuracy of the circuit in protecting the energy storage unit.

[0055] The embodiments of the present application take a battery protection circuit applied in an electronic device as an example for illustration. However, it does not mean that the embodiments of the present application can only be applied to the battery protection in the electronic device.

[0056] Alternatively, the electronic device can be any possible terminal device or server, such as a notebook computer, a smart phone, a tablet computer, a smart watch or any possible device, and the embodiments of the present application do not limit this.

[0057] The battery protection circuit provided by the embodiments of the present application will be explained and described in detail below.

[0058] Figure 1 A structural schematic diagram of a battery protection circuit provided by the present application is shown in FIG. 1. Figure 1 The embodiments of the present application provide a battery protection circuit 100, which comprises an energy storage unit 101, a protection unit 102, a switch unit 103, a current detection unit 104 and a processing unit 105.

[0059] The positive electrode of the energy storage unit 101 is connected with the first end of the protection unit 102 and the first end of the current detection unit 104 respectively, and the negative electrode of the energy storage unit 101 is used as the negative output end of the circuit 100.

[0060] The second end of the protection unit 102 is connected with the first end of the switch unit 103, and the third end of the protection unit 102 is connected with the first control end of the processing unit 105.

[0061] The second end of the switch unit 103 is connected with the second end of the current detection unit 104, and the third end of the switch unit 103 is connected with the second control end of the processing unit 105.

[0062] The third end of the current detection unit 104 is connected with the input end of the processing unit 105, and the fourth end of the current detection unit 104 is used as the positive output end of the circuit 100.

[0063] The energy storage unit 101 can be a battery, and the energy storage unit 101 can provide working power for other elements in the circuit 100, or can provide working power for other arbitrary possible elements in the electronic device. For example, the energy storage unit 101 can supply power to the current detection unit 104 through the first end of the current detection unit 104. The embodiment of the present application does not make any limitation in this regard.

[0064] Optionally, the protection unit 102 is used to act under the action of the processing unit 105 to disconnect the output loop or input loop of the energy storage unit 101. For example, the protection unit 102 can keep the loop of the energy storage unit 101 outputting power to the switch unit 103 and / or the power load outside the circuit 100 under the control of the processing unit 105, or can disconnect the loop of the energy storage unit 101 outputting power to the switch unit 103 and / or the power load outside the circuit 100 under the control of the processing unit 105.

[0065] In addition, if the external device can charge the energy storage unit 101, the protection unit 102 can also make the external device disconnect or conduct the loop of the energy storage unit 101 outputting power to the switch unit 103 and the protection unit 102 under the control of the processing unit 105, and the embodiment of the present application does not make any limitation in this regard.

[0066] Specifically, the protection unit 102 can at least include a fuse, that is, the fuse can keep conducting or fuse under the action of the processing unit 105.

[0067] In addition, the protection unit 102 can be a component that can only be disconnected once. If the protection unit 102 is disconnected, the protection unit 102 cannot be re-conducted, which indicates that the permanent failure protection of the circuit 100 is triggered at present.

[0068] Optionally, the switch unit 103 can include at least one controllable switch.

[0069] Optionally, the switch unit 103 is configured to be turned on or turned off under the action of the processing unit 105, and the switch unit 103 is configured to output the current output by the energy storage unit 101 to the current detection unit 104 when the switch unit 103 is turned on.

[0070] In addition, when the switch unit 103 is turned off or turned off, the switch unit 103 can disconnect the loop of the energy storage unit 101 outputting electric energy to the current detection unit 104 and / or the power load outside the circuit 100.

[0071] It should be noted that the switch unit 103 can be a switch element capable of being turned on and turned off multiple times. When the switch unit 103 is normally turned off or turned off, the energy storage unit 101 cannot output electric energy to the current detection unit 104 through the switch unit 103. However, if the switch unit 103 fails or is damaged, even if the switch unit 103 is turned off or turned off, the energy storage unit 101 can still output electric energy to the current detection unit 104 through the switch unit 103. At this time, the energy storage unit 101 cannot be stopped or enter a dormant state, which may cause the energy storage unit 101 to be over-discharged, over-charged or have other problems.

[0072] Optionally, the current detection unit 104 is configured to detect the first current output by the energy storage unit 101 and output the first current to the processing unit 105.

[0073] In this embodiment, the current detection unit 104 can be an element specially used to detect whether there is current in the circuit 100 and detect the size of the current. The current detection unit 104 can specifically include a Hall element, and the present application does not limit this.

[0074] In addition, the current detection unit 104 can be a chip-level device packaged into an integrated circuit. In this way, the current detection unit 104 can have strong anti-external magnetic field interference capability, and can prevent the signal output by the output pin of the current detection unit 104 from being interfered, thereby improving the reliability and accuracy of the current detection unit 104 in detecting and outputting the first current.

[0075] In this embodiment, the first current specifically refers to the current output by the energy storage unit 101 to the current detection unit 104 through the protection unit 102 and the switch unit 103.

[0076] Specifically, the first current can be used to represent whether the energy storage unit 101 still outputs electric energy through the switch unit 103 when the switch unit 103 is turned off or turned off, and the size of the current output by the energy storage unit 101 through the switch unit 103.

[0077] It can be understood that if the switch unit 103 is normal, the first current should be 0 when the switch unit 103 is off or closed. Therefore, if the first current detected by the current detection unit 104 is 0, it indicates that the current switch unit 103 is normal, and if the first current detected by the current detection unit 104 is not 0, it indicates that the current switch unit 103 is abnormal or fails.

[0078] In addition, since the fourth end of the current detection unit 104 is also used as the positive output end of the circuit 100, the energy storage unit 104 can supply power to the external load through the protection unit 102, the switch unit 103, and the fourth end of the current detection unit 104.

[0079] Optionally, the processing unit 105 can be any element with detection, identification, processing, operation, control and the like functions, and can be a coulometer in particular.

[0080] Optionally, the processing unit 105 is configured to control the protection unit 102 to act under the action of the first current.

[0081] In the embodiment, the processing unit 105 can further control the protection unit 102 according to the first current output by the switch unit 103 to the current detection unit 104 and the switch state of the switch unit 103.

[0082] For example, if the switch unit 103 is in the on or open state, the processing unit 105 will not control the protection unit 102 to be off or fused regardless of the current value of the first current output by the switch unit 103. If the switch unit 103 is off or closed, the processing unit 105 can control the protection unit 102 according to the current value of the first current.

[0083] Specifically, if the first current is 0, the processing unit 105 can determine that the switch unit 103 is in a normal state, and at this time, the processing unit can control the protection unit 102 to remain in the on state. If the first current is not 0, the processing unit 105 can determine that the switch unit 103 is in an abnormal state or fails, causing the switch unit 103 to fail to completely turn off the output path of the energy storage unit 101, at which time the processing unit can control the protection unit 102 to be fused or off to protect the energy storage unit 101.

[0084] It is worth noting that in order to better introduce the battery protection circuit 100 provided by the embodiment of the present application, the following is based on the assumption that the battery protection circuit 100 is used for protecting the energy storage unit 101. Figure 1 The working principle of the battery protection circuit 100 is described.

[0085] When the energy storage unit 101 needs to supply power to an external load, the processing unit 105 can control the switch unit 103 to be turned on at this time, and then the energy storage unit 101 outputs power from the positive electrode to the protection unit 102, and in turn through the switch unit 103, the current detection unit 104, and the positive output end of the circuit 100 to an external power load. In this case, although the current detection unit 104 outputs a current to the processing unit 105, the processing unit 105 still controls the protection unit 102 to remain in the on state because the processing unit 105 controls the switch unit 103 to be turned on.

[0086] When the energy storage unit 101 does not need to supply power to an external load, the processing unit 105 can control the switch unit 103 to be turned off or closed at this time. If the switch unit 103 is in a normal state, after the switch unit 103 is turned off or closed, the output path of the energy storage unit 101 is completely closed, at this time, the switch unit 103 does not output any power to the current detection unit 104, therefore, the first current detected by the current detection unit 104 is 0, and the processing unit 105 controls the protection unit 101 to remain in the on state based on the current first current.

[0087] If the switch unit 103 is in an abnormal or fault state, after the switch unit 103 is turned off or closed, the output path of the energy storage unit 101 cannot be completely closed, and the energy storage unit 101 can still output power to the current detection unit 104 through the switch unit 103, therefore, the first current detected by the current detection unit 104 is not 0, and the processing unit 105 controls the protection unit 101 to be disconnected or fused based on the current first current, thereby cutting off the output circuit of the energy storage unit 101 to trigger the permanent failure protection of the circuit 100.

[0088] It is worth noting that the circuit 100 provided in the present application determines whether the protection unit 102 needs to be turned off or closed by detecting whether the switch unit 103 outputs a current through the current detection unit 104, and then the current detection unit 104 outputs the detected first current to the processing unit 105, and the processing unit 105 controls the protection unit 102 according to the first current. Because the circuit 100 is provided with the current detection unit 104 which is specially used to detect whether the circuit 100 has a current, the reliability and accuracy of the processing unit 105 controlling the protection unit 102 can be ensured. In addition, the current detection unit 104 is packaged as an integrated circuit, and also has high anti-interference performance.

[0089] In the embodiment of the present application, the energy storage unit 101, the protection unit 102, the switch unit 103, the current detection unit 104 and the processing unit 105 are arranged in the battery protection circuit 100. Specifically, the positive electrode of the energy storage unit 101 is connected with the first end of the protection unit 102 and the first end of the current detection unit 104 respectively, the second end of the protection unit 102 is connected with the first end of the switch unit 103, and the third end of the protection unit 102 is connected with the first control end of the processing unit 105. The second end of the switch unit 103 is connected with the second end of the current detection unit 104, and the third end of the switch unit 103 is connected with the second control end of the processing unit 105. The third end of the current detection unit 104 is connected with the input end of the processing unit 105. In addition, the negative electrode of the energy storage unit 101 is used as the negative output end of the circuit 100, and the fourth end of the current detection unit 104 is used as the positive output end of the circuit 100.

[0090] The current detection unit 104 can accurately detect the first current output by the energy storage unit 101 when the switch unit 103 is off or closed. The processing unit 105 can control the protection unit 102 according to the current value of the first current, so as to ensure that the protection unit 102 is controlled to be disconnected to trigger the permanent failure protection only when the switch unit 103 is closed and the first current detected by the current detection unit 104 is not 0, that is, only when it is determined that the switch unit 103 fails or cannot be completely closed.

[0091] Therefore, the possibility of the circuit 100 mistakenly disconnecting the protection unit 102 and mistakenly triggering the permanent failure protection can be reduced, and the reliability and accuracy of the circuit 100 in protecting the energy storage unit 101 can be improved.

[0092] In a possible implementation manner, referring to Figure 2 The current detection unit 104 includes a Hall current sensor U and a signal conversion unit ADC.

[0093] The power supply end of the Hall current sensor U is connected with the positive electrode of the energy storage unit 101, the input end of the Hall current sensor U is connected with the second end of the switch unit 103, the first output end of the Hall current sensor U is connected with the input end of the signal conversion unit ADC, and the second output end of the Hall current sensor U is used as the positive output end of the circuit 100.

[0094] The output end of the signal conversion unit ADC is connected with the input end of the processing unit 105.

[0095] The Hall current sensor U is specifically a current detection element working based on the Hall effect.

[0096] Optionally, the Hall current sensor U is configured to convert the current inputted by the switching unit 103 into a voltage signal, and output the voltage signal to the signal conversion unit ADC.

[0097] Specifically, after the switching unit 103 inputs the first current into the Hall current sensor U, the first current flows through the copper foil inside the Hall current sensor U, and the Hall current sensor U can convert the magnetic field generated based on the first current into the voltage signal. It can be seen that the voltage signal is also generated based on the first current.

[0098] In this embodiment, the signal conversion unit ADC is configured to convert the voltage signal into a digital signal, and output the digital signal to the processing unit 105.

[0099] Optionally, the voltage signal is generally an analog signal, and therefore the signal conversion unit ADC can be an element configured to convert an analog signal into a digital signal, such as an analog-to-digital converter, and the present embodiment is not limited in this regard.

[0100] Optionally, the digital signal is configured to indicate the magnitude of the first current.

[0101] For example, it is assumed that the working voltage VCC provided by the energy storage unit 101 to the Hall current sensor U is 5V. Then, the voltage level of the voltage signal VIOUT outputted by the Hall current sensor U is: VCC*0.5+0.1*IP, where IP is the value of the first current. When the energy storage unit 101 is not charging or discharging, i.e., the Hall current sensor U is in a zero-current state, VIOUT=2.5V. When the Hall current sensor U has a current input, i.e., the first current (i.e., IP) is not 0, VIOUT=2.5V+0.1*IP is definitely greater than 2.5V.

[0102] Further, the signal conversion unit ADC can convert the voltage signal with |VIOUT|≤2.5V into a digital signal 0, and convert the voltage signal with |VIOUT|>2.5V into a digital signal 1, so that the processing unit 105 can accurately and quickly identify whether the first current is 0.

[0103] It is worth noting that in the present application, the Hall current sensor U and the signal conversion unit ADC can be packaged into an integrated circuit as a Hall IC, so that the anti-interference performance of the current detection unit 104 can be improved, and specifically, the voltage signal outputted by the Hall current sensor U can be prevented from being interfered.

[0104] It is worth mentioning that since the signal conversion unit ADC converts the voltage signal into the digital signal and then outputs the digital signal to the processing unit 105, the digital signal has stronger robustness and will not lose signal quality after long-distance transmission, so that the anti-interference capability of the current detection unit 104 and the circuit 100 can be further improved.

[0105] In a possible implementation, continuing to refer to Figure 2 , the current detection unit 104 at least further includes a current-limiting resistor R0.

[0106] The current-limiting resistor R0 is connected between the first output end of the Hall current sensor U and the input end of the signal conversion unit ADC.

[0107] In the embodiment, the current-limiting resistor R0 can be used to reduce the current size of the input end of the signal conversion unit ADC, so as to protect the signal conversion unit ADC from being damaged.

[0108] For example, continuing to refer to Figure 2 , the current detection unit 104 can further include a capacitor C1 and a capacitor C2, wherein a first plate of the capacitor C1 is connected with a filter (FILTER) pin of the Hall current sensor U, a second plate of the capacitor C1 is respectively connected with a negative output end of the circuit 100 and a ground pin of the Hall current sensor U, and the capacitor C2 is connected between the input end of the signal conversion unit ADC and the second plate of the capacitor C1.

[0109] It can be understood that the current-limiting resistor R0, the capacitor C1 and the capacitor C2 can constitute an RC filter network to filter out the noise in the voltage signal, so as to realize the function of stabilizing the circuit. In this way, the stability of the voltage signal and the above-mentioned digital signal can be further improved.

[0110] In a possible implementation, referring to Figure 3 , the protection unit 102 includes a fuse FU and a first switch tube Q1.

[0111] The first end of the fuse FU is connected with the positive electrode of the energy storage unit 101, the second end of the fuse FU is connected with the first end of the switching unit 103, and the third end of the fuse FU is connected with the source electrode of the first switch tube Q1.

[0112] The gate electrode of the first switch tube Q1 is connected with the first control end of the processing unit 105, and the drain electrode of the first switch tube Q1 is grounded.

[0113] The first switch tube Q1 is used to be turned on under the action of the processing unit 105, so as to supply power to the fuse FU.

[0114] The fuse FU is used to be heated and fused in the case that the first switch tube Q1 is turned on.

[0115] Optionally, the fuse FU can be a three-terminal fuse, and two sub-fuses in series and a heater can be provided in the fuse FU. After the first switch tube Q1 is turned on, the energy storage unit 101 can supply power to the heater in the fuse FU to make the heater heat and fuse the sub-fuses in the fuse FU, thereby achieving the purpose of fusing the fuse FU and protecting the unit 102.

[0116] Optionally, the first switch tube Q1 can be any possible switch tube such as a MOS tube, a triode, an IGBT, etc., and can be an N-channel or P-channel switch tube according to actual needs, which is not limited in the embodiments of the present application.

[0117] Specifically, the switching state of the first switch tube Q1 is controlled by the processing unit 105. The processing unit 105 can control the first switch tube Q1 to be turned on to fuse the fuse FU when it is determined that the switching unit 103 is turned off or closed and the first current is not 0. The processing unit 105 can control the first switch tube Q1 to remain turned off when it is determined that the switching unit 103 is turned on, or the switching unit 103 is turned off or closed and the first current is 0.

[0118] In this way, the processing unit 105 can achieve the purpose of fusing the fuse FU by controlling the first switch tube Q1.

[0119] In a possible implementation, the switching unit 103 includes at least one switch device.

[0120] Each switch device is connected between the second end of the protection unit 102 and the second end of the current detection unit 104, and each switch device is connected in series.

[0121] The control end of each switch device is connected to the second control end of the processing unit 105.

[0122] Each switch device is used to be turned on or turned off under the control of the processing unit 105.

[0123] Optionally, the types of the switch devices can be the same or different, which is not limited in the embodiments of the present application.

[0124] In addition, if there are multiple switch devices in the switching unit 103, the processing unit 105 can be provided with multiple second control ends, and the number of the second control ends of the processing unit 105 is the same as the number of the switch devices. In this way, the processing unit 105 can control each switch device individually.

[0125] Optionally, in one possible mode, the switch unit 103 is considered to be turned on only when all the switch devices are turned on, and is considered to be turned off or turned off if any of the switch devices is turned off.

[0126] In another possible mode, the switch unit 103 is considered to be turned off only when all the switch devices are turned off, and is considered to be turned on if any of the switch devices is turned on. The specific mode can be set according to actual needs, which is not limited by the embodiments of the present application.

[0127] It can be understood that the processing unit 105 can control the switch unit 103 to be turned on in the case that the energy storage unit 101 needs to supply power to an external power load or in the case that an external device needs to charge the energy storage unit 101. The processing unit 105 controls the switch unit 103 to be turned off in the case that the energy storage unit 101 does not need to supply power to an external power load and in the case that an external device does not need to charge the energy storage unit 101.

[0128] Exemplarily, referring to Figure 4 , each switch device specifically includes a second switch tube Q2 and a third switch tube Q3.

[0129] Optionally, the second switch tube Q2 and the third switch tube Q3 can be any possible switch tube, for example, the second switch tube Q2 can be a complementary metal oxide semiconductor (CMOS) tube, and the third switch tube Q3 can be a double-diffused metal oxide semiconductor (DMOS) tube, which is not limited by the embodiments of the present application.

[0130] Moreover, the second switch tube Q2 and the third switch tube Q3 can be used as a charging loop switch tube and a discharging loop switch tube respectively to be switched in a charging working condition or a discharging working condition.

[0131] Further, since the second switch tube Q2 and the third switch tube Q3 are both controlled by the processing unit 105, the processing unit 105 can determine the switching state of the second switch tube Q2 and the third switch tube Q3 according to the control signal output by the processing unit 105 to the second switch tube Q2 and the third switch tube Q3.

[0132] For example, if any of the switch devices is turned on, it can be regarded as the switch unit 103 being turned on. If the processing unit 105 determines that the second switch Q2 and / or the third switch Q3 is turned on, the processing unit 105 can record the switch state of the switch unit 103 as 1. If the processing unit 105 determines that the second switch Q2 and the third switch Q3 are both turned off, the processing unit 105 can record the switch state of the switch unit 103 as 0.

[0133] In addition, since the processing unit 105 receives the digital signal output by the current detection unit 104 as 1 or 0, the processing unit 105 can determine the combination of the first current and the switch state of the switch unit 103.

[0134] For example, the combination of the state of the first current and the switch state of the switch unit 103 can be (0:0; 0:1; 1:1; 1:0). When the combination is (0:0), it indicates that the switch unit 103 is in the off state, and the first current is 0, i.e., there is no current in the circuit 100. In this case, the processing unit 105 does not control the protection unit 102 to be turned off. In addition, the processing unit 105 can also lock the first control end of the processing unit 105 to ensure that the processing unit 105 does not output a control signal to the protection unit 102 to control the protection unit 102 to be turned off.

[0135] When the combination is (1:0), it indicates that the switch unit 103 is in the off state, but the first current is not 0, i.e., there is current in the circuit 100. It can be determined that the switch unit 103 is abnormal or has a fault and cannot be completely turned off. In this case, the processing unit 105 outputs a corresponding control signal to the protection unit 102 to control the protection unit 102 to be turned off.

[0136] When the combination is (0:1), it indicates that the switch unit 103 is in the on state, and the first current is 0. When the combination is (1:1), it indicates that the switch unit 103 is in the on state, and the first current is not 0. In these two cases, the processing unit 105 does not control the protection unit 102 to be turned off.

[0137] In this way, it can be accurately and quickly determined whether the protection unit 102 needs to be turned off, so as to improve the reliability and accuracy of the circuit 100 in protecting the energy storage unit 101.

[0138] In one possible implementation, referring to Figure 5 The circuit 100 further includes a sampling resistor Rs.

[0139] The negative electrode of the energy storage unit 101 is connected with the first end of the sampling resistor Rs, and the second end of the sampling resistor Rs is used as the negative output end of the circuit 100.

[0140] The first sampling end and the second sampling end of the processing unit 105 are respectively connected with the first end and the second end of the sampling resistor Rs.

[0141] Optionally, the processing unit 105 is configured to detect the second current flowing through the sampling resistor Rs, and control the protection unit 102 to act under the action of the first current, the second current and / or the switching state of the switching unit 103.

[0142] Optionally, the sampling resistor Rs can be any possible high-precision sampling resistor, and the specific resistance value can be selected according to actual needs, which is not limited in the embodiments of the present application.

[0143] Optionally, the second current is used to indicate the current size flowing through the sampling resistor Rs.

[0144] For example, if the processing unit 105 detects that the second current and the first current are both 0, and the switching unit 103 is off or on, it can be determined that the switching unit 103 can normally disconnect the circuit. If the processing unit 105 detects that the second current and the first current are both 1, and the switching unit 103 is on, it can be determined that the switching unit 103 is normally on.

[0145] If the processing unit 105 detects that the second current is 1 and the first current is 0, and the switching unit 103 is off, it can be determined that the second current is a virtual current, and further it can be determined that the switching unit 103 has a fault or an abnormality, resulting in the inability to normally disconnect the circuit. In this case, the protection unit 102 can be controlled to be fused.

[0146] In this way, the purpose of double verification can be achieved by detecting the second current flowing through the sampling resistor Rs.

[0147] In a possible implementation manner, continuing to refer to Figure 5 The circuit 100 further comprises a voltage stabilizing unit Y.

[0148] The input end of the voltage stabilizing unit Y is connected with the positive electrode of the energy storage unit 101, and the output end of the voltage stabilizing unit Y is connected with the first end of the current detecting unit 104.

[0149] The voltage stabilizing unit Y is configured to convert the voltage output by the energy storage unit 101 into a working voltage of a preset voltage level, and output the working voltage to the current detecting unit 104.

[0150] Optionally, the voltage stabilizing unit Y can be a low-dropout regulator (LDO), or any other device capable of voltage conversion and / or voltage stabilization, and the embodiments of the present application do not limit the voltage stabilizing unit Y.

[0151] Optionally, the preset voltage level can be set according to actual needs, and in general, the preset voltage level can be the rated voltage of the Hall current sensor U, and the embodiments of the present application do not limit the preset voltage level.

[0152] For example, continuing to refer to Figure 5 , the circuit 100 further includes a capacitor C3 connected between the output terminal of the voltage stabilizing unit Y and the ground terminal of the voltage stabilizing unit Y.

[0153] In addition, the capacitor C3 can serve as a filter capacitor to achieve the purpose of stabilizing the working voltage output by the voltage stabilizing unit Y.

[0154] It is worth noting that, since the voltage stabilizing unit Y can convert the input voltage into a stable working voltage of a specific voltage level, the circuit 100 can be provided with various energy storage units 101 having different output voltages, and the applicability of the circuit 100 can be improved.

[0155] In addition, since the voltage stabilizing unit Y can provide the Hall current sensor U with a stable working voltage, the Hall current sensor U can also be ensured to have a stable working condition, and thus the voltage signal output by the Hall current sensor U, the digital signal output by the signal conversion unit ADC, and / or the signal output by the current detection unit 104 to the processing unit 105 can be stable. In this way, the reliability and accuracy of the circuit 100 in protecting the energy storage unit 101 can be further improved.

[0156] In one possible manner, referring to Figure 6 , the processing unit 105 can be a coulomb meter G, and the Hall current sensor U can specifically include a Hall element as shown in Figure 6 , and the Hall element can include a power supply terminal VDD, a first output terminal VIOUT, a filter pin FILTER, a ground pin GND, two input terminals (IP1+ and IP2+), and two second output terminals (IP1- and IP2-).

[0157] In addition, the input terminal of the voltage stabilizing unit Y is a VCC terminal as shown in Figure 6 , the output terminal of the voltage stabilizing unit Y is a VOUT terminal as shown in Figure 6 , and the ground terminal of the voltage stabilizing unit Y is a GND terminal as shown in Figure 6 .

[0158] Specifically, the positive electrode of the energy storage unit 101 provides working power for the voltage stabilizing unit Y through the VCC terminal of the voltage stabilizing unit Y, and the voltage stabilizing unit Y converts the power output by the energy storage unit 101 into working voltage of a preset voltage level and then outputs the working voltage to the power terminal VDD of the Hall element through the VOUT terminal of the voltage stabilizing unit Y, so as to provide working voltage for the Hall element.

[0159] Then, in the case that the switch unit 103 is turned on or the switch unit 103 fails to be completely turned off, the second terminal of the switch unit 103 outputs current to the IP1+ terminal and the IP2+ terminal of the Hall element, and the Hall element outputs the current output by the switch unit 103 to the external power consumption load through the IP1- terminal and the IP2- terminal; meanwhile, the first output terminal VIOUT of the Hall element outputs the voltage signal to the input terminal of the signal conversion unit ADC, and then the signal conversion unit ADC converts the voltage signal into the digital signal and outputs the digital signal to the input terminal of the electric quantity meter G through the output terminal of the signal conversion unit ADC, so that the electric quantity meter G identifies the digital signal and further outputs the corresponding control signal.

[0160] The following describes an electronic device including the battery protection circuit provided by the present application, and the specific implementation process and technical effects are described above, and thus will not be described in detail.

[0161] Figure 7 FIG. 1 is a structural schematic diagram of an electronic device provided by an embodiment of the present application, which is described in detail below. Figure 7 The electronic device 200 at least includes the battery protection circuit 100 provided by any of the above embodiments.

[0162] Optionally, the electronic device 200 can further include a power consumption load Z. The power consumption load Z can include various power consumption elements, such as a display device, an audio device, an input device, a communication device, or any possible power consumption element, and the present embodiment does not limit the power consumption element.

[0163] The electronic device 200 and the circuit protection circuit provided by the above embodiments belong to the same design concept, and have similar implementation principles and technical effects, which will not be described here.

[0164] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

[0165] The above descriptions are only the preferred embodiments of the present application, and are not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery protection circuit, characterized in that: The circuit includes: an energy storage unit, a protection unit, a switch unit, a current detection unit and a processing unit; The positive electrode of the energy storage unit is connected to the first end of the protection unit and the first end of the current detection unit respectively, and the negative electrode of the energy storage unit is used as the negative output end of the circuit; The second end of the protection unit is connected to the first end of the switch unit, and the third end of the protection unit is connected to the first control end of the processing unit; the protection unit is configured to operate under the action of the processing unit to disconnect the output circuit of the energy storage unit; The second end of the switch unit is connected to the second end of the current detection unit, and the third end of the switch unit is connected to the second control end of the processing unit; the switch unit is used to be turned on or off under the action of the processing unit, and when the switch unit is turned on, the current output by the energy storage unit is output to the current detection unit; The third terminal of the current detection unit is connected to the input terminal of the processing unit, and the fourth terminal of the current detection unit is used as the positive output terminal of the circuit; the current detection unit is used to detect the first current output by the energy storage unit and output the first current to the processing unit; The processing unit is used to control the action of the protection unit under the action of the first current.

2. The battery protection circuit according to claim 1, wherein: The current detection unit includes: a Hall current sensor and a signal conversion unit; The power supply end of the Hall current sensor is connected to the positive electrode of the energy storage unit, the input end of the Hall current sensor is connected to the second end of the switch unit, the first output end of the Hall current sensor is connected to the input end of the signal conversion unit, and the second output end of the Hall current sensor is used as the positive output end of the circuit; the Hall current sensor is used to convert the current input by the switch unit into a voltage signal, and output the voltage signal to the signal conversion unit; The output end of the signal conversion unit is connected to the input end of the processing unit; the signal conversion unit is used to convert the voltage signal into a digital signal and output the digital signal to the processing unit, and the digital signal is used to indicate the magnitude of the first current.

3. The battery protection circuit according to claim 2, wherein: The current detection unit further includes at least: a current limiting resistor; The current limiting resistor is connected between the first output terminal of the Hall current sensor and the input terminal of the signal conversion unit.

4. The battery protection circuit according to claim 1, wherein: The protection unit includes: a fuse and a first switch tube; The first end of the fuse is connected to the positive electrode of the energy storage unit, the second end of the fuse is connected to the first end of the switch unit, and the third end of the fuse is connected to the source electrode of the first switch tube; The gate of the first switch tube is connected to the first control terminal of the processing unit, and the drain of the first switch tube is grounded; the first switch tube is used to be turned on under the action of the processing unit to supply power to the fuse; The fuse is used to generate heat and melt when the first switch tube is turned on.

5. The battery protection circuit according to claim 1, wherein: The switch unit includes at least one switch device; Each of the switch devices is connected between the second end of the protection unit and the second end of the current detection unit, and each of the switch devices is connected in series in sequence; The control end of each of the switch devices is connected to the second control end of the processing unit respectively; Each of the switch devices is used to be turned on or off under the control of the processing unit.

6. The battery protection circuit according to claim 5, wherein: Each of the switching devices specifically includes: a second switching tube and a third switching tube.

7. The battery protection circuit according to claim 1, wherein: The circuit further includes a sampling resistor; The negative electrode of the energy storage unit is connected to the first end of the sampling resistor, and the second end of the sampling resistor is used as the negative output end of the circuit; Furthermore, the first sampling terminal and the second sampling terminal of the processing unit are respectively connected to the first terminal and the second terminal of the sampling resistor; the processing unit is used to detect the second current flowing through the sampling resistor, and control the action of the protection unit under the action of the first current, the second current and / or the switching state of the switching unit.

8. The battery protection circuit according to claim 1, wherein: The processing unit is a fuel gauge, and the energy storage unit is a battery.

9. The battery protection circuit according to any one of claims 1 to 8, wherein: The circuit further includes a voltage stabilizing unit; The input end of the voltage stabilizing unit is connected to the positive electrode of the energy storage unit, and the output end of the voltage stabilizing unit is connected to the first end of the current detection unit; The voltage stabilizing unit is used to convert the voltage output by the energy storage unit into an operating voltage of a preset voltage level, and output the operating voltage to the current detection unit.

10. An electronic device, characterized in that: The electronic device at least comprises the battery protection circuit according to any one of claims 1 to 9.

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