Charging circuit and power management system

Abstract

The application discloses a charging circuit and a power management system. The charging circuit of the application is provided with a voltage conversion circuit, a voltage detection circuit, a current detection circuit and a control module. The voltage conversion circuit controls the parameters of the charging interface charging the energy storage component according to the pulse signal of the control module. The voltage detection circuit detects the input voltage of the charging interface. The current detection circuit detects the input current of the charging interface. In the case that at least one of the input voltage and the input current is abnormal, the control module determines the target charging parameter according to the maximum input current or the initial input voltage in the charging process, so that the control module outputs the pulse signal to the voltage conversion circuit according to the target charging parameter, and the charging interface charges the energy storage component with the target charging parameter. In this way, the problem that the charging cannot be normally performed when the current charging power is smaller than the rated charging power value is solved, and the charging efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and in particular to a charging circuit and a power management system. Background Technology

[0002] In related technologies, most use pure hardware DC-DC charging management ICs to manage the charging of multiple battery cells. However, when using DC-DC charging circuits to manage the charging of energy storage components, insufficient input power can easily trigger the DC-DC charging circuit protection or pull the input power supply down to a very low voltage, resulting in low charging efficiency. Summary of the Invention

[0003] This application aims to address at least one of the technical problems existing in the prior art.

[0004] Therefore, this application provides a charging circuit and a power management system.

[0005] This application provides a charging circuit for charging an energy storage component. The charging circuit includes a voltage conversion circuit, a voltage detection circuit, a current detection circuit, and a control module.

[0006] The voltage conversion circuit is connected to the charging interface and the energy storage component respectively. The voltage conversion circuit controls the parameters of the charging interface to charge the energy storage component based on the pulse signal of the control module.

[0007] The voltage detection circuit is connected to the charging interface and is used to detect the input voltage of the charging interface;

[0008] The current detection circuit is connected to the charging interface and is used to detect the input current of the charging interface;

[0009] The control module is connected to the voltage detection circuit, the current detection circuit, and the voltage conversion circuit respectively, and the control module is used for:

[0010] During the charging process of the energy storage component through the charging interface, if the input voltage and / or the input current are abnormal, the target charging parameters are determined based on the maximum input current or the initial input voltage during the charging process.

[0011] Based on the target charging parameters, the pulse signal output to the voltage conversion circuit is readjusted until the charging interface charges the energy storage component with the target charging parameters.

[0012] In some implementations, if the input voltage and / or the input current are abnormal, it includes: if the drop in the input voltage exceeds a first threshold and / or the input current is lower than a second threshold.

[0013] In some implementations, the target charging parameter includes at least one of a target input current, a target input voltage, or a target input power.

[0014] In some embodiments, before determining the target charging parameters based on the maximum input current or initial input voltage during the charging process of the charging interface to the energy storage component, if the input voltage and / or the input current are abnormal, the method further includes:

[0015] When the initial input voltage is applied to the charging interface, the pulse signal output to the voltage conversion circuit is adjusted until the charging interface charges the energy storage component at the rated input power.

[0016] In some implementations, the target charging parameter includes a target input current, and the control module is further configured to update the maximum input current based on the input current detected by the current detection circuit.

[0017] In some embodiments, adjusting the pulse signal output to the voltage conversion circuit includes: continuously increasing the duty cycle of the pulse signal output to the voltage conversion circuit starting from the initial output pulse signal.

[0018] In some implementations, determining the target charging parameters based on the maximum input current or the initial voltage includes:

[0019] The target charging parameter is a first preset ratio of the input current to the maximum input current; or

[0020] The input current when the input voltage is a second preset ratio of the initial voltage is used as the target charging parameter.

[0021] In some implementations, the first preset ratio ranges from 90% to 100%, and the second preset ratio ranges from 90% to 95%.

[0022] In some embodiments, the voltage conversion circuit includes:

[0023] An inductor, the first end of which is connected to the charging interface;

[0024] A power transistor, wherein a first connection terminal of the power transistor is connected to a second terminal of the inductor, the second connection terminal is connected to a ground terminal, and a control terminal is connected to the control module;

[0025] A diode, wherein the positive terminal of the diode is connected to the second terminal of the inductor and the first terminal of the power transistor, and the negative terminal is connected to the energy storage component.

[0026] In some embodiments, the voltage detection circuit includes:

[0027] A first detection resistor, with its first end connected to the charging interface and its second end connected to the control module;

[0028] The second detection resistor has its first end connected to the second end of the first detection resistor, and its second end connected to the ground terminal.

[0029] In some embodiments, the current detection circuit includes:

[0030] The third detection resistor has a first end connected to the charging interface and a second end connected to the ground terminal.

[0031] The fourth detection resistor has its first end connected to the ground terminal and its second end connected to the control module.

[0032] In some embodiments, the charging circuit further includes:

[0033] An overvoltage protection circuit is connected to the voltage conversion circuit and the control module respectively, and is used to shut down the voltage conversion circuit when the output voltage of the voltage conversion circuit is greater than a preset threshold.

[0034] In some embodiments, the overvoltage protection circuit includes:

[0035] A Zener diode, the negative terminal of which is connected to the voltage conversion circuit;

[0036] The first voltage divider resistor has its first end connected to the positive terminal of the Zener diode and its second end connected to the ground terminal.

[0037] The second voltage divider resistor has its first terminal connected to the positive terminal of the Zener diode;

[0038] A switching transistor is provided, with its first terminal connected to the control module, its second terminal connected to the ground terminal, and its control terminal connected to the second terminal of the second voltage divider resistor.

[0039] In some embodiments, the charging circuit further includes:

[0040] An energy storage component protection circuit is connected in series with the voltage conversion circuit and the energy storage component;

[0041] A power supply circuit, connecting the energy storage component protection circuit and the control module, is used to provide a power supply voltage to the control module based on the current of the energy storage component protection circuit.

[0042] In some embodiments, the charging circuit further includes:

[0043] The button control circuit is connected to the energy storage component protection circuit and the control module, respectively.

[0044] This application also provides a power management system, which includes the charging circuit described in any of the above claims.

[0045] The charging circuit of this application includes a voltage conversion circuit, a voltage detection circuit, a current detection circuit, and a control module. The voltage conversion circuit controls the charging parameters of the charging interface to the energy storage component based on the pulse signal from the control module. The voltage detection circuit detects the input voltage of the charging interface, and the current detection circuit detects the input current of the charging interface. If at least one of the input voltage or input current is abnormal, the control module determines the target charging parameters based on the maximum input current or the initial input voltage during the charging process. The control module then outputs a pulse signal to the voltage conversion circuit according to the target charging parameters, causing the charging interface to charge the energy storage component with the target charging parameters. This solves the problem of inability to charge normally when the current charging power is less than the rated charging power value, thus improving charging efficiency.

[0046] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0047] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0048] Figure 1 This is a schematic diagram of the charging circuit according to an embodiment of this application;

[0049] Figure 2 This is a schematic diagram of the voltage conversion circuit according to an embodiment of this application;

[0050] Figure 3 This is a schematic diagram of the voltage detection circuit according to an embodiment of this application;

[0051] Figure 4 This is a schematic diagram of the current detection circuit according to an embodiment of this application;

[0052] Figure 5 This is another schematic diagram of the charging circuit according to an embodiment of this application;

[0053] Figure 6 This is a schematic diagram of the overvoltage protection circuit according to an embodiment of this application;

[0054] Figure 7 This is a schematic diagram of the power management system according to an embodiment of this application.

[0055] Explanation of key component symbols:

[0056] The system includes a power management system 1000, a charging circuit 100, a voltage conversion circuit 10, an inductor L1, a power transistor Q1, a diode D1, a voltage detection circuit 20, a first detection resistor R1, a second detection resistor R2, a third detection resistor R3, a fourth detection resistor R4, a current detection circuit 30, a control module 40, an overvoltage protection circuit 50, a Zener diode D2, a first voltage divider resistor R5, a second voltage divider resistor R6, a switching transistor Q2, an energy storage component protection circuit 60, a power supply circuit 70, a button control circuit 80, a charging interface 200, an energy storage component 300, and a ground terminal GND. Detailed Implementation

[0057] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0058] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0060] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0061] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0062] Please see Figure 1 This application provides a charging circuit 100 for charging an energy storage component 300. The charging circuit 100 includes a voltage conversion circuit 10, a voltage detection circuit 20, a current detection circuit 30, and a control module 40.

[0063] Specifically, the energy storage component 300 can be a battery, supercapacitor, or other device used to store electrical energy. The voltage conversion circuit 10 is connected to both the charging interface 200 and the energy storage component 300. The voltage conversion circuit 10 can adjust the charging parameters of the charging interface 200 to the energy storage component 300 according to the pulse signal from the control module 40. The voltage detection circuit 20 is connected to both the charging interface 200 and the control module 40. The voltage detection circuit 20 is used to detect the input voltage of the charging interface 200 and transmit the voltage signal to the control module 40. The current detection circuit 30 is connected to both the charging interface 200 and the control module 40. The current detection circuit 30 is used to detect the input current of the charging interface 200 and transmit the current signal to the control module 40.

[0064] The control module 40 is connected to the voltage detection circuit 20, the current detection circuit 30, and the voltage conversion circuit 10. The control module 40 can receive signals from the voltage detection circuit 20 and the current detection circuit 30, and can update the maximum input current based on the input current detected by the current detection circuit 30. The control module 40 can also provide pulse signals to the voltage conversion circuit 10. During the charging process of the charging interface 200 to the energy storage component 300, if at least one of the input voltage and input current is abnormal, the control module 40 can determine the target charging parameters based on the maximum input current or the initial input voltage during the charging process. The control module 40 can update the maximum input current based on the input current detected by the current detection circuit 30. An abnormal input voltage may include a voltage drop exceeding a first threshold, and an abnormal input current may include an input current below a second threshold. The target charging parameters may include at least one of the target input current, target input voltage, or target input power.

[0065] In some embodiments, during the charging process of the charging interface 200 to the energy storage component 300, if the input voltage and / or input current are abnormal, before determining the target charging parameters based on the maximum input current or initial input voltage during the charging process, the control module 40 adjusts the pulse signal output to the voltage conversion circuit 10 when the initial input voltage is connected to the charging interface 200, until the charging interface 200 charges the energy storage component 300 with the rated input power.

[0066] Furthermore, during the charging process of the charging interface 200 to the energy storage component 300, the control module 40 can determine the target input current based on the initial voltage detected by the voltage detection circuit 20 during the charging process if the input voltage drop exceeds a first threshold. That is, the target input current is the input current at a second preset ratio where the current input voltage is the initial voltage. The second preset ratio can range from 90% to 95%. For example, the second preset ratio can be 95%, meaning the input current at 95% of the initial voltage is used as the target input current. During the charging process of the charging interface 200 to the energy storage component 300, if the input current falls below the second threshold, the control module 40 can determine the target input current based on the maximum input current detected by the current detection circuit 30 during the charging process. The target input current can be a first preset ratio of the maximum input current. The first preset ratio can range from 90% to 100%. For example, the first preset ratio can be 90%, meaning 90% of the maximum input current is used as the target input current.

[0067] It should be noted that the first threshold representing the input voltage drop and the second threshold representing the input current can be configured according to the actual situation, and are not limited here.

[0068] Furthermore, the pulse signal output to the voltage conversion circuit 10 is readjusted according to the target charging parameters until the charging interface 200 charges the energy storage component 300 with the target charging parameters. That is, starting from the output of the initial pulse signal, the control module 40 continuously increases the duty cycle of the pulse signal output to the voltage conversion circuit 10 until the charging interface 200 charges the energy storage component 300 with the target charging parameters.

[0069] The charging circuit 100 of this application comprises a voltage conversion circuit 10, a voltage detection circuit 20, a current detection circuit 30, and a control module 40. The voltage conversion circuit 10 controls the charging parameters of the charging interface 200 to the energy storage component 300 according to the pulse signal of the control module 40. The voltage detection circuit 20 detects the input voltage of the charging interface 200, and the current detection circuit 30 detects the input current of the charging interface 200. When at least one of the input voltage and input current is abnormal, the control module 40 determines the target charging parameters based on the maximum input current or the initial input voltage during the charging process. The control module 40 then outputs a pulse signal to the voltage conversion circuit 10 according to the target charging parameters, so that the charging interface 200 charges the energy storage component 300 with the target charging parameters. In this way, the problem that the charging circuit 100 cannot charge normally when the current charging power is less than the rated charging power value is solved, and the charging efficiency is improved.

[0070] Please see Figure 2 In some embodiments, the voltage conversion circuit 10 includes an inductor L1, a power transistor Q1, and a diode D1.

[0071] Specifically, the first end of inductor L1 is connected to charging interface 200, the first connection end of power transistor Q1 is connected to the second end of inductor L1, the second connection end is connected to ground terminal GND, the control terminal is connected to control module 40, the positive terminal of diode D1 is connected to the second end of inductor L1 and the first connection end of power transistor Q1, and the negative terminal of diode D1 is connected to energy storage component 300.

[0072] Furthermore, inductor L1 is an energy storage inductor. When the control module 40 outputs a pulse signal to control the power transistor Q1 to conduct, the charging interface 200 forms a circuit by connecting the ground terminal GND through inductor L1, allowing the charging interface 200 to charge inductor L1. When the control module 40 outputs a pulse signal to control the power transistor Q1 to deactivate, inductor L1 is connected to the energy storage component 300 through diode D1, allowing inductor L1 to charge the energy storage component 300.

[0073] Thus, the voltage conversion circuit 10 is configured with an inductor L1, a power transistor Q1, and a diode D1. The inductor L1 is connected to the charging interface 200, the power transistor Q1 is connected to the control module 40, and the diode D1 is connected to the energy storage component 300. The control module 40 controls the switching on and off of the power transistor Q1, thereby controlling the inductor L1 to charge the energy storage component 300, achieving the effect of voltage conversion.

[0074] Please see Figure 3 In some embodiments, the voltage detection circuit 20 includes a first detection resistor R1 and a second detection resistor R2.

[0075] Specifically, the first end of the first detection resistor R1 is connected to the charging interface 200, and the second end is connected to the control module 40. The first end of the second detection resistor R2 is connected to the second end of the first detection resistor R1, and the second end of the second detection resistor R2 is connected to the ground terminal GND. The first detection resistor R1 can be a current-limiting resistor, used to limit the current of the voltage detection circuit 20 to prevent the control module 40 from being damaged by excessive current. The second detection resistor R2 can be a voltage divider resistor. The control module 40 can obtain the voltage of the second detection resistor R2, and based on the ratio of the resistance values ​​of the first detection resistor R1 and the second detection resistor R2, the control module 40 can obtain the input voltage of the charging interface 200. For example, the resistance value of the first detection resistor R1 can be 100KΩ, and the resistance value of the second detection resistor R2 can be 20KΩ. If the control module 40 detects that the voltage of the second detection resistor R2 is 10V, the control module 40 can calculate that the input voltage of the charging interface 200 is 60V.

[0076] Thus, the voltage detection circuit 20 protects the control module 40 by setting a first detection resistor R1 and a second detection resistor R2. The first detection resistor R1 is used to limit the current of the voltage detection circuit 20. The control module 40 can obtain the input voltage provided by the charging interface 200 by detecting the voltage of the second detection resistor R2 and by calculation.

[0077] Please see Figure 4 In some embodiments, the current detection circuit 30 includes a third detection resistor R3 and a fourth detection resistor R4.

[0078] Specifically, the first end of the third sensing resistor R3 is connected to the charging interface 200, and the second end is connected to the ground terminal GND. The first end of the fourth sensing resistor R4 is connected to the second end of the third sensing resistor R3 and the ground terminal GND, and the second end is connected to the control module 40. The current from the charging interface 200 flows to the ground terminal GND through the third sensing resistor R3. The control module 40 obtains the input current provided by the charging interface 200 by connecting to the second end of the third sensing resistor R3 through the fourth sensing resistor R4. The fourth sensing resistor R4 is used to limit the current and protect the control module 40. The resistance of the third sensing resistor R3 is relatively small, while the resistance of the fourth sensing resistor R4 is relatively large; for example, the resistance of the third sensing resistor R3 can be 50 milliohms, and the resistance of the fourth sensing resistor R4 can be 1 kilohm.

[0079] Thus, the current detection circuit 30 is connected to the ground terminal GND by setting the third detection resistor R3, and the control module 40 is connected to the third detection resistor R3 and the ground terminal GND by the fourth detection resistor R4, thereby detecting the input current. The fourth detection resistor R4 can limit the current protection control module 40.

[0080] Please see Figure 5 and Figure 6 In some embodiments, the charging circuit 100 further includes an overvoltage protection circuit 50.

[0081] Specifically, the overvoltage protection circuit 50 is connected to the voltage conversion circuit 10 and the control module 40 respectively. The overvoltage protection circuit 50 is used to shut down the voltage conversion circuit 10 when the output voltage of the voltage conversion circuit 10 exceeds a preset threshold, thereby stopping the energy storage component 300 from charging. The overvoltage protection circuit 50 includes a Zener diode D2, a first voltage divider resistor R5, a second voltage divider resistor R6, and a switching transistor Q2. The cathode of the Zener diode D2 is connected to the voltage conversion circuit 10. The first terminal of the first voltage divider resistor R5 is connected to the anode of the Zener diode D2, and the second terminal is connected to the ground terminal GND. The first terminal of the second voltage divider resistor R6 is connected to the anode of the Zener diode D2. The first terminal of the switching transistor Q2 is connected to the control module 40, the second terminal is connected to the ground terminal GND, and the control terminal is connected to the second terminal of the second voltage divider resistor R6.

[0082] Furthermore, when the output voltage of the voltage conversion circuit 10 is lower than the preset threshold, the second voltage divider resistor R6 is at a low level, that is, the control terminal of the switching transistor Q2 is at a low level, the switching transistor Q2 is off, and the control module 40 cannot control the voltage conversion circuit 10 to shut down. When the input voltage of the voltage conversion circuit 10 is greater than the preset threshold, the second voltage divider resistor R6 is at a high level, that is, the control terminal of the switching transistor Q2 is at a high level, the switching transistor Q2 is on, the control module 40 forms a loop with the ground terminal GND to generate a control signal, and the control module 40 can control the voltage conversion circuit 10 to shut down, so that the energy storage component 300 stops charging.

[0083] Thus, by setting up an overvoltage protection circuit 50, the charging circuit 100 controls the voltage conversion circuit 10 to shut down and stop charging the energy storage component 300 when the output voltage of the voltage conversion circuit 10 exceeds a preset threshold. This avoids damage to the energy storage component 300 caused by excessive output voltage of the voltage conversion circuit 10 and improves the safety of the charging circuit 100.

[0084] Please see Figure 5 In some embodiments, the charging circuit 100 further includes an energy storage component protection circuit 60 and a power supply circuit 70.

[0085] Specifically, the energy storage component protection circuit 60 is connected in series between the voltage conversion circuit 10 and the energy storage component 300, and is used to protect the energy storage component 300. The power supply circuit 70 is connected to the energy storage component protection circuit 60 and the control module 40 respectively, and is used to provide power supply voltage to the control module 40 according to the current of the energy storage component protection circuit 60.

[0086] Furthermore, the energy storage component protection circuit 60 can detect the stored energy of the energy storage component 300. In the event of overcharging or over-discharging of the energy storage component 300, the energy storage component protection circuit 60 can disconnect the voltage conversion circuit 10 from the energy storage component 300, thereby protecting the energy storage component 300.

[0087] Thus, by setting up an energy storage component protection circuit 60 and a power supply circuit 70, the charging circuit 100 can prevent the energy storage component 300 from overcharging or over-discharging by controlling the energy storage component protection circuit 60, thereby protecting the energy storage component 300 and extending its service life. The power supply circuit 70 can provide power to the control module 40, enabling the control module 40 to generate pulse signals to control the charging circuit 100.

[0088] Please see Figure 5 In some embodiments, the charging circuit 100 further includes a button control circuit 80.

[0089] Specifically, the button control circuit 80 is connected to both the energy storage component protection circuit 60 and the control module 40. The button control circuit 80 can be a manual button, and the control module 40 can be reset by manually pressing or toggling the button control circuit 80. The energy storage component protection circuit 60 can supply power to the button control circuit 80.

[0090] Thus, by setting up a button control circuit 80, which is connected to the energy storage component protection circuit 60 and the control module 40, the energy storage component protection circuit 60 can supply power to the button control circuit 80, and the control module 40 can be reset by controlling the button control circuit 80.

[0091] Please see Figure 7 In some embodiments, the power management system 1000 includes a charging circuit 100.

[0092] The power management system 1000 of this application includes a charging circuit 100. The charging circuit 100 is configured with a voltage conversion circuit 10, a voltage detection circuit 20, a current detection circuit 30, and a control module 40. The voltage conversion circuit 10 controls the charging parameters of the charging interface 200 to the energy storage component 300 according to the pulse signal of the control module 40. The voltage detection circuit 20 detects the input voltage of the charging interface 200, and the current detection circuit 30 detects the input current of the charging interface 200. When at least one of the input voltage and input current is abnormal, the control module 40 determines the target charging parameters according to the maximum input current or the initial input voltage during the charging process. Thus, the control module 40 outputs a pulse signal to the voltage conversion circuit 10 according to the target charging parameters, so that the charging interface 200 charges the energy storage component 300 with the target charging parameters. In this way, the problem of not being able to charge normally when the charging power is less than the rated charging power value is solved, and the charging efficiency is improved.

[0093] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with the described embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A charging circuit for charging an energy storage component, characterized in that, The charging circuit includes a voltage conversion circuit, a voltage detection circuit, a current detection circuit, and a control module; The voltage conversion circuit is connected to the charging interface and the energy storage component respectively. The voltage conversion circuit controls the parameters of the charging interface to charge the energy storage component based on the pulse signal of the control module. The voltage detection circuit is connected to the charging interface and is used to detect the input voltage of the charging interface; The current detection circuit is connected to the charging interface and is used to detect the input current of the charging interface; The control module is connected to the voltage detection circuit, the current detection circuit, and the voltage conversion circuit respectively, and the control module is used for: During the charging process of the charging interface to the energy storage component, if the input voltage and / or the input current are abnormal, the target charging parameters are determined according to the maximum input current or the initial input voltage during the charging process. If the input voltage and / or the input current are abnormal, it includes: if the drop in the input voltage exceeds a first threshold and / or the input current is lower than a second threshold. Based on the target charging parameters, the pulse signal output to the voltage conversion circuit is readjusted until the charging interface charges the energy storage component with the target charging parameters.

2. The charging circuit according to claim 1, characterized in that, The target charging parameters include at least one of the target input current, target input voltage, or target input power.

3. The charging circuit according to claim 1, characterized in that, During the charging process of the charging interface to the energy storage component, if the input voltage and / or the input current are abnormal, before determining the target charging parameters based on the maximum input current or the initial input voltage during the charging process, the following steps are also included: When the initial input voltage is applied to the charging interface, the pulse signal output to the voltage conversion circuit is adjusted until the charging interface charges the energy storage component at the rated input power.

4. The charging circuit according to claim 1, characterized in that, The target charging parameters include the target input current, and the control module is further configured to update the maximum input current based on the input current detected by the current detection circuit.

5. The charging circuit according to claim 1, characterized in that, The adjustment of the pulse signal output to the voltage conversion circuit includes: starting from the initial output pulse signal, continuously increasing the duty cycle of the pulse signal output to the voltage conversion circuit.

6. The charging circuit according to claim 1, characterized in that, Determining the target charging parameters based on the maximum input current or the initial input voltage includes: The target charging parameter is a first preset ratio of the input current to the maximum input current; or The input current when the input voltage is a second preset ratio of the initial input voltage is used as the target charging parameter.

7. The charging circuit according to claim 6, characterized in that, The first preset ratio ranges from 90% to 100%, and the second preset ratio ranges from 90% to 95%.

8. The charging circuit according to claim 1, characterized in that, The voltage conversion circuit includes: An inductor, the first end of which is connected to the charging interface; A power transistor, wherein a first connection terminal of the power transistor is connected to a second terminal of the inductor, the second connection terminal is connected to a ground terminal, and a control terminal is connected to the control module; A diode, wherein the positive terminal of the diode is connected to the second terminal of the inductor and the first terminal of the power transistor, and the negative terminal is connected to the energy storage component.

9. The charging circuit according to claim 1, characterized in that, The voltage detection circuit includes: A first detection resistor, with its first end connected to the charging interface and its second end connected to the control module; The second detection resistor has its first end connected to the second end of the first detection resistor, and its second end connected to the ground terminal.

10. The charging circuit according to claim 1, characterized in that, The current detection circuit includes: The third detection resistor has a first end connected to the charging interface and a second end connected to the ground terminal. The fourth detection resistor has its first end connected to the ground terminal and its second end connected to the control module.

11. The charging circuit according to claim 1, characterized in that, The charging circuit also includes: An overvoltage protection circuit is connected to the voltage conversion circuit and the control module respectively, and is used to shut down the voltage conversion circuit when the output voltage of the voltage conversion circuit is greater than a preset threshold.

12. The charging circuit according to claim 11, characterized in that, The overvoltage protection circuit includes: A Zener diode, the negative terminal of which is connected to the voltage conversion circuit; The first voltage divider resistor has its first end connected to the positive terminal of the Zener diode and its second end connected to the ground terminal. The second voltage divider resistor has its first terminal connected to the positive terminal of the Zener diode; A switching transistor is provided, with its first terminal connected to the control module, its second terminal connected to the ground terminal, and its control terminal connected to the second terminal of the second voltage divider resistor.

13. The charging circuit according to claim 1, characterized in that, The charging circuit also includes: An energy storage component protection circuit is connected in series with the voltage conversion circuit and the energy storage component; A power supply circuit, connecting the energy storage component protection circuit and the control module, is used to provide a power supply voltage to the control module based on the current of the energy storage component protection circuit.

14. The charging circuit according to claim 1, characterized in that, The charging circuit also includes: The button control circuit is connected to the energy storage component protection circuit and the control module, respectively.

15. A power management system, characterized in that, The power management system includes the charging circuit according to any one of claims 1-14.

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