Battery charging protection circuit, battery charging protection device and electronic equipment

Abstract

The utility model belongs to the technical field of charging, and provides a battery charging protection circuit, a battery charging protection device and electronic equipment, a temperature sampling circuit is used for sampling the temperature of a battery module to obtain a temperature sampling signal, and a main control circuit is used for generating multiple paths of charging current control signals according to the temperature sampling signal; the charging current configuration circuit generates a charging current configuration signal according to the multiple paths of charging current control signals, and the battery charging circuit adjusts the charging current output to the battery module according to the charging current configuration signal, so that the temperature detection function of the battery charging circuit is increased through hardware design; temperature protection is provided for the charging process of the battery module, so that the battery charging circuit can set corresponding charging current according to different temperatures, and the purpose of quickly charging the battery module at a safe working temperature is achieved.

Description

Technical Field

[0001] The present application belongs to the field of charging technology, and in particular relates to a battery charging protection circuit, a battery charging protection device and an electronic device. Background Art

[0002] Electronic devices are increasingly entering our homes, and they are becoming more intelligent. Currently, there is a strong market demand for fast charging of electronic devices. However, due to their special electrochemical properties, batteries have different charging and discharging characteristics at different temperatures. Generally, the charging and discharging current is the largest at room temperature, and the battery charging current is limited at both high and low temperatures. Therefore, based on safety and performance considerations, designers need to configure the battery charging and discharging current at different temperatures when designing the battery charging and discharging current.

[0003] For example, in the case of a microprocessor (MCU), after detecting high temperature, some functional modules of the system can be shut down to enter low power mode, thereby reducing the discharge current of the battery. Because charging is independent of MCU control, many charging single chips on the market currently do not have charging temperature detection function, or there is a problem that the temperature range setting does not meet the battery standard specifications. Utility Model Content

[0004] In order to solve the above technical problems, the embodiments of the present application provide a battery charging protection circuit, a battery charging protection device and an electronic device, which aim to solve the problem that the charging current of the current charging single chip cannot be flexibly adjusted according to the battery temperature.

[0005] A first aspect of an embodiment of the present application provides a battery charging protection circuit connected to a battery module, the battery charging protection circuit comprising:

[0006] A temperature sampling circuit, configured to sample the temperature of the battery module to obtain a temperature sampling signal;

[0007] A main control circuit, connected to the temperature sampling circuit, configured to receive the temperature sampling signal and generate a plurality of charging current control signals according to the temperature sampling signal;

[0008] A charging current configuration circuit, connected to the main control circuit, configured to receive a plurality of charging current control signals and generate a charging current configuration signal according to the plurality of charging current control signals;

[0009] The battery charging circuit is connected to the charging current configuration circuit and the battery module, and is configured to receive the charging current configuration signal and adjust the charging current output to the battery module according to the charging current configuration signal.

[0010] In some embodiments, the charging current configuration circuit includes: a plurality of current configuration units, each of which corresponds to a plurality of charging current control signals;

[0011] Each of the current configuration units receives the corresponding charging current control signal and adjusts the charging current configuration signal according to the corresponding charging current control signal.

[0012] In some embodiments, the current configuration unit includes a current limiting resistor, a first switch tube, a first resistor, and a second resistor;

[0013] The first end of the current limiting resistor is connected to the battery charging circuit, the second end of the current limiting resistor is connected to the first end of the first switch tube, the second end of the first switch tube is grounded, the control end of the first switch tube, the first end of the first resistor and the first end of the second resistor are connected in common, the second end of the second resistor is grounded, and the second end of the first resistor is connected to the main control circuit.

[0014] In some embodiments, the resistance values ​​of the current limiting resistors in each of the current configuration units are different from each other.

[0015] In some embodiments, the resistance values ​​of the current limiting resistors in the current configuration units are arranged in an arithmetic progression.

[0016] In some embodiments, resistance values ​​of the current limiting resistors in the plurality of current configuration units are arranged in a geometric progression.

[0017] In some embodiments, first ends of the current limiting resistors in the plurality of current configuration units are commonly connected to the battery charging circuit.

[0018] In some embodiments, the number of the current configuration units is at least 2.

[0019] A second aspect of the embodiments of the present application further provides a battery charging protection device, wherein the battery charging protection device comprises the battery charging protection circuit as described in any one of the above embodiments.

[0020] A third aspect of the embodiments of the present application further provides an electronic device, comprising: a battery module; and a battery charging protection circuit as described in any one of the above embodiments, wherein the battery charging protection circuit is connected to the battery module.

[0021] The beneficial effects of the embodiments of the present application are as follows: the temperature of the battery module is sampled by the temperature sampling circuit to obtain a temperature sampling signal, the main control circuit generates a plurality of charging current control signals according to the temperature sampling signal, the charging current configuration circuit generates a charging current configuration signal according to the plurality of charging current control signals, and the battery charging circuit adjusts the charging current output to the battery module according to the charging current configuration signal, thereby increasing the temperature detection function of the battery charging circuit through hardware design, providing temperature protection for the charging process of the battery module, so that the battery charging circuit can set the corresponding charging current according to different temperatures, and achieve the purpose of fast charging of the battery module at a safe working temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The battery charging protection circuit provided in the embodiment of the present application is schematically shown in FIG. Figure 1 ;

[0023] Figure 2 The battery charging protection circuit provided in the embodiment of the present application is schematically shown in FIG. Figure 2 ;

[0024] Figure 3 The battery charging protection circuit provided in the embodiment of the present application is schematically shown in FIG. Figure 3 ;

[0025] Figure 4 The battery charging protection circuit provided in the embodiment of the present application is schematically shown in FIG. Figure 4 . DETAILED DESCRIPTION

[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not configured to limit the present application.

[0027] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0028] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means one or more, unless otherwise clearly and specifically defined.

[0030] For safety and performance reasons, designers need to configure the battery charging and discharging current at different temperatures when designing the battery charging and discharging current. In the case of a microprocessor (MCU), after detecting high temperature, some functional modules of the system can be shut down to enter low power mode, thereby reducing the battery discharge current. Because charging is independent of MCU control, many charging single chips on the market currently do not have charging temperature detection functions, or there is a problem that the temperature range setting does not meet the battery standard specifications.

[0031] In order to solve the above technical problems, the embodiment of the present application provides a battery charging protection circuit, which is connected to the battery module 500. Figure 1 As shown, the battery charging protection circuit includes: a temperature sampling circuit 100, a main control circuit 200, a charging current configuration circuit 300 and a battery charging circuit 400. The temperature sampling circuit 100 is configured to sample the temperature of the battery module 500 to obtain a temperature sampling signal; the main control circuit 200 is connected to the temperature sampling circuit 100, and the main control circuit 200 is configured to receive the temperature sampling signal and generate multiple charging current control signals according to the temperature sampling signal. The charging current configuration circuit 300 is connected to the main control circuit 200, and the charging current configuration circuit 300 is configured to receive multiple charging current control signals and generate charging current configuration signals according to the multiple charging current control signals. The battery charging circuit 400 is connected to the charging current configuration circuit 300 and the battery module 500, and the battery charging circuit 400 is configured to receive the charging current configuration signal and adjust the charging current output to the battery module 500 according to the charging current configuration signal.

[0032] In this embodiment, the temperature of the battery module 500 is sampled by the temperature sampling circuit 100 to obtain a temperature sampling signal, the main control circuit 200 generates a plurality of charging current control signals according to the temperature sampling signal, the charging current configuration circuit 300 generates a charging current configuration signal according to the plurality of charging current control signals, and the battery charging circuit 400 adjusts the charging current output to the battery module 500 according to the charging current configuration signal, thereby increasing the temperature detection function of the battery charging circuit 400 through hardware design, providing temperature protection for the charging process of the battery module 500, so that the battery charging circuit 400 can set the corresponding charging current according to different temperatures, and achieve the purpose of fast charging of the battery module 500 at a safe working temperature.

[0033] In some embodiments, the charging current control signal can be a high level or a low level, and multiple charging current control signals can form a combination signal of a high level and a low level. With this design, the charging current configuration circuit 300 does not require a digital-to-analog conversion circuit, and can feedback temperature sampling signals corresponding to multiple temperatures through the charging current control signal in the form of an analog signal, and correspond to multiple temperatures through the high and low level combination of multiple charging current control signals.

[0034] In some embodiments, see Figure 2 As shown, the charging current configuration circuit 300 includes multiple current configuration units 310, and the multiple current configuration units 310 correspond one-to-one to multiple charging current control signals respectively; each current configuration unit 310 receives a corresponding charging current control signal and adjusts the charging current configuration signal according to the corresponding charging current control signal.

[0035] In this embodiment, the main control circuit 200 generates multiple charging current control signals according to the temperature sampling signal, and controls the working states of multiple current configuration units 310 respectively through the multiple charging current control signals. The combination of the working states of the multiple current configuration units 310 can adjust the charging current configuration signal to a corresponding voltage value, and the voltage value of the charging current configuration signal corresponds to the temperature value of the battery module 500.

[0036] In some embodiments, the working states of multiple current configuration units 310 include an on state and an off state. When the charging current control signal is at a high level, the current configuration unit 310 corresponding to the charging current control signal is turned on. When the charging current control signal is at a low level, the current configuration unit 310 corresponding to the charging current control signal is turned off. The voltage value of the charging current configuration signal is adjusted by controlling the on and off of each current configuration unit 310.

[0037] In some embodiments, the temperature value of the battery module 500 may be divided into a plurality of temperature intervals, and each temperature interval may correspond to a voltage value of a charging current configuration signal.

[0038] In some embodiments, see Figure 3 As shown, the current configuration unit 310 includes a current limiting resistor R0, a first switch tube Q1, a first resistor R1, and a second resistor R2; the first end of the current limiting resistor R0 is connected to the battery charging circuit 400, the second end of the current limiting resistor R0 is connected to the first end of the first switch tube Q1, the second end of the first switch tube Q1 is grounded, the control end of the first switch tube Q1, the first end of the first resistor R1, and the first end of the second resistor R2 are connected in common, the second end of the second resistor R2 is grounded, and the second end of the first resistor R1 is connected to the main control circuit 200.

[0039] In the present embodiment, the charging current output by the charging chip in the battery charging circuit 400 is controlled by its dedicated current configuration pin. The voltage of the current configuration pin or the connected resistance value can enable the charging chip in the battery charging circuit 400 to output the corresponding charging current. When the current configuration pin of the charging chip is connected to different resistors, the current configuration pin will generate a corresponding voltage, and the charging chip will output the corresponding charging current based on the voltage of the current configuration pin. Therefore, the voltage of the current configuration pin can also be directly adjusted to control the charging chip in the battery charging circuit 400 to output the corresponding charging current.

[0040] In some embodiments, the resistance value of the current limiting resistor R0 in each current configuration unit 310 is different from each other. In this embodiment, by setting the resistance values ​​of the current limiting resistors R0 in multiple current configuration units 310 to be different from each other, different current configuration units 310 can be selected to be turned on, so that the resistance values ​​of the current configuration pins connected to the charging chip are different, and a variety of charging current gears are added accordingly. For example, when the resistance values ​​of the current limiting resistors R0 in multiple current configuration units 310 are different from each other, six different charging currents can be configured by controlling the switch states of the first switch tubes Q1 in three current configuration units 310, and the specific current value and configuration method can be adjusted according to actual conditions.

[0041] In some embodiments, the resistance values ​​of the current limiting resistors R0 in the multiple current configuration units 310 are arranged in an arithmetic progression.

[0042] In this embodiment, by setting the resistance value of the current limiting resistor R0 in the current configuration unit 310 to be an arithmetic progression, the various charging currents can be increased step by step, corresponding to the temperature of the battery module 500 .

[0043] In some embodiments, the resistance values ​​of the current limiting resistors R0 in the plurality of current configuration units 310 are arranged in a geometric progression.

[0044] In this embodiment, by setting the resistance value of the current limiting resistor R0 in the current configuration unit 310 to be a geometric progression, a variety of charging currents can be increased step by step, and when the temperature of the battery module 500 is at a safe temperature, it can be quickly adjusted to the maximum charging current to meet the needs of fast charging.

[0045] In some embodiments, first terminals of the current limiting resistors R0 in the plurality of current configuration units 310 are commonly connected to the battery charging circuit 400 .

[0046] In this embodiment, the first ends of the current limiting resistors R0 in the multiple current configuration units 310 are commonly connected to the battery charging circuit 400, and the multiple current limiting resistors R0 form a parallel circuit when the corresponding first switch tubes Q1 are turned on. The multiple charging current control signals are configured as a high level or low level combination according to the required resistance values, so that the main control circuit 200 adjusts the resistance value of the charging current configuration circuit 300 by outputting multiple charging current control signals, thereby controlling the battery charging circuit 400 to output the corresponding charging current.

[0047] In some embodiments, the number of the current configuration units 310 is at least two.

[0048] In this embodiment, the number of current configuration units 310 can be set according to the application scenario requirements of the battery module 500. For example, when the number of current configuration units 310 is 3 and the resistance values ​​of the current limiting resistors R0 in the current configuration units 310 are different, 6 different charging currents can be configured by controlling the switching states of the first switching tubes Q1 in the three current configuration units 310. The specific current value and configuration method can be adjusted according to the actual situation.

[0049] In some embodiments, Figure 4 As shown, the battery charging circuit 400 may include a battery charging chip U1 and peripheral components thereof. For example, the battery charging circuit 400 includes the battery charging chip U1, a third resistor R3, and a first capacitor C1. The first end of the third resistor R3 and the first end of the first capacitor C1 are connected to the main control circuit 200. The second end of the third resistor R3 is connected to the enable pin EN of the battery charging chip U1. The second end of the first capacitor C1 is grounded. The main control circuit 200 may provide an enable signal to the battery charging chip U1 via the third resistor R3, thereby controlling the working state of the battery charging chip U1. For example, in the case of excessive temperature, by providing a low-level enable signal to the enable pin EN of the battery charging chip U1, the battery charging chip U1 may be controlled to stop working.

[0050] In some embodiments, in combination Figure 4As shown, the charging pin VBAT of the battery charging chip U1 is connected to the battery module 500. The battery charging chip U1 is configured to provide a charging current to the battery module 500 according to the bus voltage VBUS connected to its input pin VIN. The size of the charging current output by the battery charging chip U1 is controlled by the resistance value connected to its current configuration pin ICHG.

[0051] In some embodiments, the main control circuit 200 can be composed of a main control chip and its peripheral components. The main control chip is connected to the temperature sampling circuit 100 through its temperature sampling pin, and determines the charging current adapted at the current sampling temperature according to the temperature characteristics of the battery module 500, thereby outputting corresponding multi-channel charging current control signals. The charging current configuration circuit 300 generates a charging current configuration signal according to the multi-channel charging current control signal, and the battery charging circuit 400 adjusts the charging current output to the battery module 500 according to the charging current configuration signal, thereby increasing the temperature detection function of the battery charging circuit 400 through hardware design, providing temperature protection for the charging process of the battery module 500, so that the battery charging circuit 400 can set the corresponding charging current according to different temperatures, and achieve the purpose of fast charging of the battery module 500 at a safe working temperature.

[0052] An embodiment of the present application further provides a battery charging protection device, which includes the battery charging protection circuit as described in any one of the above embodiments.

[0053] An embodiment of the present application further provides an electronic device, comprising: a battery module; and a battery charging protection circuit as described in any one of the above embodiments, wherein the battery charging protection circuit is connected to the battery module.

[0054] The beneficial effects of the embodiments of the present application are as follows: the temperature of the battery module is sampled by the temperature sampling circuit to obtain a temperature sampling signal, the main control circuit generates a plurality of charging current control signals according to the temperature sampling signal, the charging current configuration circuit generates a charging current configuration signal according to the plurality of charging current control signals, and the battery charging circuit adjusts the charging current output to the battery module according to the charging current configuration signal, thereby increasing the temperature detection function of the battery charging circuit through hardware design, providing temperature protection for the charging process of the battery module, so that the battery charging circuit can set the corresponding charging current according to different temperatures, and achieve the purpose of fast charging of the battery module at a safe working temperature.

[0055] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0056] In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not configured to limit the protection scope of this application. The specific working process of the units and modules in the above system can refer to the corresponding process in the above method embodiment, and will not be repeated here.

[0057] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0058] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0059] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A battery charging protection circuit connected to a battery module, characterized in that: The battery charging protection circuit comprises: A temperature sampling circuit, configured to sample the temperature of the battery module to obtain a temperature sampling signal; A main control circuit, connected to the temperature sampling circuit, configured to receive the temperature sampling signal and generate a plurality of charging current control signals according to the temperature sampling signal; A charging current configuration circuit, connected to the main control circuit, configured to receive a plurality of charging current control signals and generate a charging current configuration signal according to the plurality of charging current control signals; The battery charging circuit is connected to the charging current configuration circuit and the battery module, and is configured to receive the charging current configuration signal and adjust the charging current output to the battery module according to the charging current configuration signal.

2. The battery charging protection circuit according to claim 1, characterized in that: The charging current configuration circuit comprises: a plurality of current configuration units, wherein the plurality of current configuration units correspond one-to-one to the plurality of charging current control signals respectively; Each of the current configuration units receives the corresponding charging current control signal and adjusts the charging current configuration signal according to the corresponding charging current control signal.

3. The battery charging protection circuit as claimed in claim 2, characterized in that: The current configuration unit includes a current limiting resistor, a first switch tube, a first resistor, and a second resistor; The first end of the current limiting resistor is connected to the battery charging circuit, the second end of the current limiting resistor is connected to the first end of the first switch tube, the second end of the first switch tube is grounded, the control end of the first switch tube, the first end of the first resistor and the first end of the second resistor are connected in common, the second end of the second resistor is grounded, and the second end of the first resistor is connected to the main control circuit.

4. The battery charging protection circuit as claimed in claim 2, characterized in that: The resistance values ​​of the current limiting resistors in each of the current configuration units are different from each other.

5. The battery charging protection circuit as claimed in claim 4, characterized in that: The resistance values ​​of the current limiting resistors in the multiple current configuration units are arranged in an arithmetic progression.

6. The battery charging protection circuit as claimed in claim 4, characterized in that: The resistance values ​​of the current limiting resistors in the multiple current configuration units are arranged in a geometric progression.

7. The battery charging protection circuit as claimed in claim 2, characterized in that: The first ends of the current limiting resistors in the plurality of current configuration units are commonly connected to the battery charging circuit.

8. The battery charging protection circuit as claimed in claim 2, characterized in that: The number of the current configuration units is at least 2.

9. A battery charging protection device, characterized in that: The battery charging protection device comprises the battery charging protection circuit as described in any one of claims 1-8.

10. An electronic device, characterized in that: include: Battery module; And the battery charging protection circuit according to any one of claims 1 to 8, wherein the battery charging protection circuit is connected to a battery module.

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