A charging control circuit and a control method thereof

Abstract

A charging control circuit and a control method thereof, wherein the charging control circuit comprises: an input port, a first output port, and a second output port; a current detection component, one end of which is electrically connected to the second output port and the other end of which is grounded; a voltage adjustment chip, whose input end is electrically connected to the input port, whose output end is electrically connected to the first output port, whose first voltage detection port is electrically connected to the second output port, and whose voltage adjustment chip adjusts the output voltage according to the voltage change of the current detection component to control the output current of the charging control circuit to remain constant; an MCU control chip, whose second voltage detection port is electrically connected to the first output port, whose first control signal port is electrically connected to the control port of the voltage adjustment chip, and controls the operation and shutdown of the voltage adjustment chip according to the voltage of the first output port. The output current is detected and compared with the preset current value, and the output voltage of the voltage adjustment chip is adjusted accordingly to keep the charging current constant.

Description

Technical Field

[0001] The present invention relates to the technical field of battery charging control, and in particular to a charging control circuit and a control method thereof. Background Art

[0002] With the development of battery charging technology, the battery energy density is getting higher and higher, the volume is getting smaller and smaller, the weight is getting lighter and lighter, and the cycle life is getting longer and longer. It has many advantages such as economy, environmental protection, and long service life. In today's society, more and more household appliances use rechargeable batteries, which improves the portability of household appliances and brings great convenience to users.

[0003] At present, when rechargeable batteries are used as the power source of household appliances, they are generally equipped with a dedicated charging management chip. However, in actual use, if users use household appliances excessively, the power of the rechargeable battery will be low, that is, its own voltage will be low, resulting in excessive charging current when charging the rechargeable battery, which reduces the service life of the rechargeable battery. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the charging current is too large and the life of the rechargeable battery is reduced due to constant voltage charging when the voltage is low due to low power of the rechargeable battery, thereby providing a charging control circuit, including:

[0005] an input port, a first output port, and a second output port;

[0006] a current detection component, one end of which is electrically connected to the second output port and the other end of which is grounded;

[0007] a voltage regulating chip, whose input end is electrically connected to the input port, whose output end is electrically connected to the first output port, and whose first voltage detection port is electrically connected to the second output port, wherein the voltage regulating chip adjusts the output voltage according to the voltage change of the current detection component to control the output current of the charging control circuit to remain constant;

[0008] The MCU control chip has a second voltage detection port electrically connected to the first output port, and a first control signal port electrically connected to the control port of the voltage adjustment chip, and controls the operation and shutdown of the voltage adjustment chip according to the voltage of the first output port.

[0009] Preferably, the charging control circuit further includes: a voltage regulating inductor and a rectifier device;

[0010] One end of the voltage regulating inductor is electrically connected to the input end of the voltage regulating chip, and the other end of the voltage regulating inductor is electrically connected to the output end of the voltage regulating chip;

[0011] One end of the rectifier device is electrically connected to the output end of the voltage adjustment chip, and the other end of the rectifier device is electrically connected to the first output port.

[0012] Preferably, the rectifier device is a rectifier diode;

[0013] The anode of the rectifier diode is electrically connected to the output end of the voltage adjustment chip, and the cathode of the rectifier diode is electrically connected to the first output port.

[0014] Preferably, the current detection component includes a current detection unit;

[0015] The current detection unit includes a plurality of detection resistors connected in parallel and / or in series.

[0016] Preferably, the MCU control chip further includes: a second control signal port;

[0017] The current detection component also includes: a plurality of current adjustment units connected in parallel;

[0018] The current adjustment unit comprises: an adjustment resistor and a controllable switch connected in series;

[0019] A plurality of controllable switches are electrically connected to the second control signal port of the MCU control chip respectively.

[0020] Preferably, the controllable switch is a triode;

[0021] The base of the transistor is electrically connected to the MCU control chip.

[0022] Preferably, the charging control circuit further includes:

[0023] A temperature detection component, which is electrically connected to the temperature detection port of the MCU control chip to obtain the ambient temperature when the charging control circuit is running;

[0024] The MCU control chip controls the opening and closing of a plurality of controllable switches according to the temperature value obtained by the temperature detection component.

[0025] Preferably, the charging control circuit further includes:

[0026] An overvoltage protection component has one end electrically connected to the first output port, and the other end electrically connected to the second output port.

[0027] Preferably, the overvoltage protection component includes: a voltage stabilizing diode;

[0028] An anode of the voltage stabilizing diode is electrically connected to the second output port, and a cathode of the voltage stabilizing diode is electrically connected to the first output port.

[0029] Preferably, the charging control circuit further includes:

[0030] A first filter component and / or a second filter component;

[0031] One end of the first filter component is electrically connected to the input end of the voltage adjustment chip, and the other end thereof is grounded;

[0032] One end of the second filter component is electrically connected to the first output port, and the other end thereof is grounded.

[0033] Preferably, the charging control circuit further includes:

[0034] A first current limiting resistor and / or a second current limiting resistor;

[0035] The first current limiting resistor is arranged between the first control signal port of the MCU control chip and the control port of the voltage adjustment chip;

[0036] The second current limiting resistor is disposed between the first voltage detection port of the voltage adjustment chip and the second output port.

[0037] Accordingly, the present invention also provides a charging control circuit control method for controlling the charging control circuit, comprising the following steps:

[0038] Obtaining an output current of the charging control circuit;

[0039] comparing the output current of the charging control circuit with a preset current value;

[0040] According to the comparison result, the output current of the charging control circuit is adjusted.

[0041] Preferably, obtaining the output current of the charging control circuit includes:

[0042] Acquiring a voltage value of a second output port of the charging control circuit;

[0043] The output current of the charging control circuit is obtained according to the voltage value of the second output port of the charging control circuit and the impedance value of the current detection module of the charging control circuit.

[0044] Preferably, comparing the output current of the charging control circuit with a preset current value includes:

[0045] Comparing the voltage value of the second output port of the charging control circuit with a preset reference voltage value;

[0046] The preset reference voltage value is a corresponding voltage value when the current detection component of the charging control circuit flows through the preset current value.

[0047] Preferably, adjusting the output current of the charging control circuit according to the comparison result includes:

[0048] When the output current of the charging control circuit is less than a preset current value, controlling the charging control circuit to increase the output current;

[0049] When the output current of the charging control circuit is greater than the preset current value, the charging control circuit is controlled to reduce the output current.

[0050] Accordingly, the present invention also provides a charging control circuit control method for controlling the charging control circuit, comprising the following steps:

[0051] Acquire a real-time voltage difference between a first output port and a second output port of the charging control circuit;

[0052] When the real-time voltage difference is less than a first preset value, controlling the output current of the charging control circuit to be a first preset current;

[0053] When the real-time voltage difference is greater than a first preset value and less than a second preset value, controlling the output current of the charging control circuit to be a second preset current, wherein the second preset value is greater than the first preset value, and the value of the second preset current is greater than the value of the first preset current;

[0054] When the real-time voltage difference is greater than a second preset current, the voltage adjustment chip of the charging control circuit is turned off.

[0055] The technical solution of the present invention has the following advantages:

[0056] The charging control circuit and control method provided by the present invention detect the voltage of the current detection component and compare it with a preset reference voltage, thereby controlling the output voltage of the voltage adjustment chip to keep the charging current constant, thereby overcoming the problem that when the battery power is too low, the charging current is too large due to low voltage, which damages the rechargeable battery, and prolonging the service life of the rechargeable battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 A schematic diagram of the charging control circuit in an embodiment of the present invention;

[0059] Figure 2 The flow chart of the charging control circuit control method in the embodiment of the present invention is as follows: Figure 1 ;

[0060] Figure 3 The flow chart of the charging control circuit control method in the embodiment of the present invention is as follows: Figure 2 ;

[0061] Figure 4 4 is a comparison diagram of charging voltage and charging current in an embodiment of the present invention. DETAILED DESCRIPTION

[0062] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0063] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0064] The technical solution of the present application is described below by taking a rechargeable battery as an example, the rechargeable battery can be two rechargeable batteries, the lowest voltage when the charging voltage is exhausted is 2.5V, and the voltage value after full charge is 8.4V. The above content is only used to illustrate the technical solution of the present application, and the present invention is not limited thereto.

[0065] The first aspect of the embodiment of the present invention provides a charging control circuit, please refer to Figure 1, including: an input port Vin, a first output port Vout1 and a second output port Vout2; a current detection component 1, one end of which is electrically connected to the second output port Vout2, and the other end of which is grounded; a voltage adjustment chip U1, whose input end U1-1 is electrically connected to the input port Vin, whose output end U1-2 is electrically connected to the first output port Vout1, and whose first voltage detection port U1-3 is electrically connected to the second output port Vout2, the voltage adjustment chip U1 adjusts the output voltage according to the voltage change of the current detection component 1 to control the output current of the charging control circuit to remain constant; an MCU control chip U2, whose second voltage detection port U2-1 is electrically connected to the first output port Vout1, and whose first control signal port U2-2 is electrically connected to the control port U1-4 of the voltage adjustment chip U1, and controls the operation and shutdown of the voltage adjustment chip U1 according to the voltage of the first output port Vout1.

[0066] The charging control circuit controls the output voltage of the voltage adjustment chip U1 by detecting the voltage of the current detection component 1 and comparing it with a preset reference voltage, so as to keep the charging current constant. This overcomes the problem that when the battery power is too low, the charging current is too large due to low voltage, which damages the rechargeable battery, and improves the service life of the rechargeable battery.

[0067] Optionally, the charging control circuit further includes: a voltage regulating inductor L1 and a rectifier device D1. One end of the voltage regulating inductor L1 is electrically connected to the input terminal U1-1 of the voltage regulating chip U1, and the other end thereof is electrically connected to the output terminal U1-2 of the voltage regulating chip U1. One end of the rectifier device D1 is electrically connected to the output terminal U1-2 of the voltage regulating chip U1, and the other end thereof is electrically connected to the first output port Vout1. By providing the voltage regulating inductor L1 and the rectifier device D1, the voltage regulation accuracy of the voltage regulating chip U1 is improved.

[0068] Optionally, the rectifying device D1 is a rectifying diode. The anode of the rectifying diode is electrically connected to the output terminal U1 - 2 of the voltage regulating chip U1 , and the cathode of the rectifying diode is electrically connected to the first output port Vout1 .

[0069] In one implementation of this embodiment, the current detection component 1 includes a current detection unit. The current detection unit includes a plurality of detection resistors R1 connected in parallel and / or in series. The resistance value of the detection resistor R1 is a fixed value. According to the overall impedance value of the current detection unit and the voltage value of the current detection unit, the current value of the current detection unit can be obtained, and this value is the charging current of the load.

[0070] After the voltage adjustment chip U1 obtains the voltage value of the current detection component 1, it compares the voltage value of the current detection component 1 with the preset reference voltage in the voltage adjustment chip U1. When the voltage value of the current detection component 1 is greater than the preset reference voltage, the output voltage of the voltage adjustment chip U1 is reduced to reduce the voltage of the current detection component 1 and adjust the output current of the load to the preset current value; when the voltage value of the current detection component 1 is less than the preset reference voltage, the output voltage of the voltage adjustment chip U1 is increased to increase the voltage of the current detection component 1 and adjust the output current of the load to the preset current value. Through the above method, constant current charging of the load is achieved, and when charging the rechargeable battery, the constant charging current is guaranteed, thereby increasing the service life of the rechargeable battery.

[0071] Optionally, the MCU control chip U2 also includes: a second control signal port U2-3. The current detection component 1 also includes: a plurality of current adjustment units connected in parallel. The current adjustment unit includes: an adjustment resistor R3 and a controllable switch Q1 connected in series. The plurality of controllable switches Q1 are electrically connected to the second control signal port U2-3 of the MCU control chip U2, respectively. By setting a current adjustment unit in the current detection component 1 and controlling the opening and closing of the controllable switch Q1, the overall impedance value of the current detection component 1 is adjusted, and the size of the charging current is adjusted.

[0072] Optionally, the controllable switch Q1 is a triode. The base of the triode is electrically connected to the MCU control chip U2. The MCU control chip U2 controls the triodes in a plurality of current adjustment units to control the overall impedance value of the current detection component 1. Using a triode as the controllable switch Q1 has the advantages of high reliability and low cost.

[0073] Optionally, the charging control circuit also includes: a temperature detection component. The temperature detection component is electrically connected to the temperature detection port of the MCU control chip U2 to obtain the ambient temperature when the charging control circuit is running. The MCU control chip U2 controls the opening and closing of several controllable switches Q1 based on the temperature value obtained by the temperature detection component 1. In order to compensate for the impact of charging current on charging time and service life caused by changes in ambient temperature, the charging control circuit is provided with a temperature detection component to detect the ambient temperature when the charging control circuit is running. The MCU control chip U2 obtains ambient temperature data through the temperature detection port and adjusts the controllable switch in the current detection component 1 accordingly, thereby compensating for the impact of ambient temperature changes on the rechargeable battery and improving the charging efficiency.

[0074] Specifically, when the ambient temperature is at 25℃±5℃, the preset charging current value can be used for charging; when the ambient temperature is at 40℃±5℃, the MCU control chip U2 adjusts several controllable switches Q1 of the current adjustment unit to increase the overall impedance of the current detection component 1, so that the charging current is reduced to 1 / 2 of the preset charging current value; thereafter, when the ambient temperature rises by 5℃ every time, the charging current is controlled to be reduced by half, and when the ambient temperature reaches 70℃, charging of the rechargeable battery is stopped.

[0075] In one implementation of the embodiment of the present invention, the charging control circuit further includes: an overvoltage protection component D2. One end of the overvoltage protection component D2 is electrically connected to the first output port Vout1, and the other end thereof is electrically connected to the second output port Vout2. The overvoltage protection component D2 can ensure that the rechargeable battery stops charging after being fully charged, thereby preventing the problem of overcharging of the rechargeable battery.

[0076] Optionally, the overvoltage protection component D2 includes: a voltage regulator diode. The positive electrode of the voltage regulator diode is electrically connected to the second output port Vout2, and the negative electrode thereof is electrically connected to the first output port Vout1. Optionally, the breakdown voltage of the voltage regulator diode is greater than 9V, which can ensure that charging stops only after the battery is fully charged.

[0077] In one implementation of the embodiment of the present invention, the charging control circuit further includes: a first filter component C1 and / or a second filter component C2. One end of the first filter component C1 is electrically connected to the input terminal U1-1 of the voltage adjustment chip U1, and the other end thereof is grounded. One end of the second filter component C2 is electrically connected to the first output port Vout1, and the other end thereof is grounded.

[0078] In one implementation of the embodiment of the present invention, the charging control circuit further includes: a first current limiting resistor R3 and / or a second current limiting resistor R4. The first current limiting resistor R3 is arranged between the first control signal port U2-2 of the MCU control chip U2 and the control port U1-4 of the voltage adjustment chip U1. The second current limiting resistor R4 is arranged between the first voltage detection port U1-3 of the voltage adjustment chip U1 and the second output port Vout2.

[0079] A second aspect of the present invention provides a charging control circuit control method, please refer to Figure 3 , used to control the charging control circuit provided by the first aspect of the embodiment of the present invention, comprising the following steps:

[0080] S100, obtaining the output current of the charging control circuit.

[0081] S200, comparing the output current of the charging control circuit with a preset current value.

[0082] S300, adjusting the output current of the charging control circuit according to the comparison result.

[0083] In one implementation of this embodiment, obtaining the output current of the charging control circuit includes:

[0084] S110, obtaining a voltage value of a second output port Vout2 of the charging control circuit.

[0085] S120, obtaining the output current of the charging control circuit according to the voltage value of the second output port Vout2 of the charging control circuit and the impedance value of the current detection module of the charging control circuit.

[0086] In another implementation of this embodiment, comparing the output current of the charging control circuit with the preset current value includes: comparing the voltage value of the second output port Vout2 of the charging control circuit with a preset reference voltage value. The preset reference voltage value is the corresponding voltage value when the current detection component 1 of the charging control circuit flows through the preset current value.

[0087] Specifically, the preset reference voltage may be 0.3V, and the charging current value may be obtained according to the overall impedance value of the current detection component 1. When the voltage value of the second output port Vout2 of the charging control circuit is less than 0.3V, the output voltage of the voltage adjustment chip U1 is increased so that the voltage value of the second output port Vout2 of the charging control circuit tends to 0.3V; when the voltage value of the second output port Vout2 of the charging control circuit is greater than 0.3V, the output voltage of the voltage adjustment chip U1 is reduced so that the voltage value of the second output port Vout2 of the charging control circuit tends to 0.3V, so that the charging current remains constant.

[0088] The output current of the charging control circuit is adjusted according to the comparison result, including: when the output current of the charging control circuit is less than the preset current value, controlling the charging control circuit to increase the output current; when the output current of the charging control circuit is greater than the preset current value, controlling the charging control circuit to reduce the output current.

[0089] A third aspect of the present invention provides a charging control circuit control method, please refer to Figure 4 , used to control the charging control circuit provided by the first aspect of the embodiment of the present invention, comprising the following steps:

[0090] S400, obtaining a real-time voltage difference between a first output port Vout1 and a second output port Vout2 of a charging control circuit.

[0091] S500, when the real-time voltage difference is less than a first preset value, controlling the output current of the charging control circuit to be a first preset current.

[0092] S600, when the real-time voltage difference is greater than the first preset value and less than the second preset value, the output current of the charging control circuit is controlled to be the second preset current, wherein the second preset value is greater than the first preset value, and the value of the second preset current is greater than the value of the first preset current.

[0093] S700, when the real-time voltage difference is greater than the second preset current, turning off the voltage adjustment chip U1 of the charging control circuit.

[0094] Specifically, when the voltage of the rechargeable battery before charging is the lower limit voltage (2.5V), trickle charging is performed, and the output voltage of the voltage adjustment chip U1 is adjusted so that the charging current of the rechargeable battery is C / 10, where C is the capacity value of the rechargeable battery. When the voltage of the rechargeable battery reaches the threshold voltage (3V), fast charging is performed, and the output voltage of the voltage adjustment chip U1 is adjusted so that the charging current of the rechargeable battery is 0.5C-1C. When the voltage of the rechargeable battery reaches the cut-off voltage (8.4V), charging is stopped, and the voltage adjustment chip U1 is turned off through the MCU control chip, and the rechargeable battery completes charging.

[0095] In addition, when the voltage of the rechargeable battery reaches the upper limit voltage (7.4V), the voltage stabilizing device of the charging control circuit is gradually turned on until the cut-off voltage is reached and charging stops.

[0096] 6 6.2 6.4 6.6 6.8 7 7.2 7.4 7.6 7.8 8 8.2 8.4 8.6 8.8 9 0.505 0.506 0.504 0.5 0.498 0.493 0.488 0.475 0.46 0.433 0.396 0.338 0.273 0.196 0.113 0

[0097] Depend on Figure 4 As can be seen from the above table, after the voltage of the rechargeable battery reaches 7.4V, the charging current gradually decreases due to the gradual conduction of the Zener diode. After the voltage of the rechargeable battery reaches 9V (i.e., the breakdown voltage of the Zener diode), the charging current is zero and charging stops completely, thus achieving overcharge protection for the rechargeable battery.

[0098] A charging control circuit and a control method thereof provided in an embodiment of the present invention detect the voltage of a current detection component and compare it with a preset reference voltage, thereby controlling the output voltage of a voltage adjustment chip to keep the charging current constant. This overcomes the problem that when the battery power is too low, the charging current is too large and damages the rechargeable battery due to low voltage, thereby improving the service life of the rechargeable battery.

[0099] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A charging control circuit, characterized in that: include: an input port, a first output port, and a second output port; a current detection component, one end of which is electrically connected to the second output port and the other end of which is grounded; a voltage regulating chip, whose input end is electrically connected to the input port, whose output end is electrically connected to the first output port, and whose first voltage detection port is electrically connected to the second output port, wherein the voltage regulating chip adjusts the output voltage according to the voltage change of the current detection component to control the output current of the charging control circuit to remain constant; An MCU control chip, whose second voltage detection port is electrically connected to the first output port, whose first control signal port is electrically connected to the control port of the voltage adjustment chip, and controls the operation and shutdown of the voltage adjustment chip according to the voltage of the first output port; The current detection component includes a current detection unit; The current detection unit includes a plurality of detection resistors connected in parallel and / or in series, and a current value of the current detection unit is obtained according to an overall impedance value of the current detection unit and a voltage value of the current detection unit; The MCU control chip also includes: a second control signal port; The current detection component also includes: a plurality of current adjustment units connected in parallel; The current adjustment unit comprises: an adjustment resistor and a controllable switch connected in series; A plurality of controllable switches are electrically connected to the second control signal port of the MCU control chip respectively.

2. The charging control circuit according to claim 1, characterized in that: Also includes: Voltage regulating inductors and rectifier devices; One end of the voltage regulating inductor is electrically connected to the input end of the voltage regulating chip, and the other end of the voltage regulating inductor is electrically connected to the output end of the voltage regulating chip; One end of the rectifier device is electrically connected to the output end of the voltage adjustment chip, and the other end of the rectifier device is electrically connected to the first output port.

3. The charging control circuit according to claim 2, characterized in that: The rectifier device is a rectifier diode; The anode of the rectifier diode is electrically connected to the output end of the voltage adjustment chip, and the cathode of the rectifier diode is electrically connected to the first output port.

4. The charging control circuit according to claim 1, characterized in that: The controllable switch is a triode; The base of the transistor is electrically connected to the MCU control chip.

5. The charging control circuit according to claim 1, characterized in that: Also includes: A temperature detection component, which is electrically connected to the temperature detection port of the MCU control chip to obtain the ambient temperature when the charging control circuit is running; The MCU control chip controls the opening and closing of a plurality of controllable switches according to the temperature value obtained by the temperature detection component.

6. The charging control circuit according to claim 1, characterized in that: Also includes: An overvoltage protection component has one end electrically connected to the first output port, and the other end electrically connected to the second output port.

7. The charging control circuit according to claim 6, characterized in that: The overvoltage protection component includes: a voltage stabilizing diode; An anode of the voltage stabilizing diode is electrically connected to the second output port, and a cathode of the voltage stabilizing diode is electrically connected to the first output port.

8. The charging control circuit according to any one of claims 1 to 7, characterized in that: Also includes: A first filter component and / or a second filter component; One end of the first filter component is electrically connected to the input end of the voltage adjustment chip, and the other end thereof is grounded; One end of the second filter component is electrically connected to the first output port, and the other end thereof is grounded.

9. The charging control circuit according to any one of claims 1 to 7, characterized in that: Also includes: A first current limiting resistor and / or a second current limiting resistor; The first current limiting resistor is arranged between the first control signal port of the MCU control chip and the control port of the voltage adjustment chip; The second current limiting resistor is disposed between the first voltage detection port of the voltage adjustment chip and the second output port.

10. A charging control circuit control method, used to control the charging control circuit according to any one of claims 1 to 9, characterized in that: The steps include: Obtaining an output current of the charging control circuit; comparing the output current of the charging control circuit with a preset current value; According to the comparison result, the output current of the charging control circuit is adjusted.

11. The charging control circuit control method according to claim 10, characterized in that: The obtaining the output current of the charging control circuit includes: Acquiring a voltage value of a second output port of the charging control circuit; The output current of the charging control circuit is obtained according to the voltage value of the second output port of the charging control circuit and the impedance value of the current detection module of the charging control circuit.

12. The charging control circuit control method according to claim 11, characterized in that: The comparing the output current of the charging control circuit with a preset current value comprises: Comparing the voltage value of the second output port of the charging control circuit with a preset reference voltage value; The preset reference voltage value is a corresponding voltage value when the current detection component of the charging control circuit flows through the preset current value.

13. The charging control circuit control method according to claim 10, characterized in that: The step of adjusting the output current of the charging control circuit according to the comparison result comprises: When the output current of the charging control circuit is less than a preset current value, controlling the charging control circuit to increase the output current; When the output current of the charging control circuit is greater than the preset current value, the charging control circuit is controlled to reduce the output current.

14. A charging control circuit control method, used to control the charging control circuit according to any one of claims 1 to 9, characterized in that: The steps include: Acquire a real-time voltage difference between a first output port and a second output port of the charging control circuit; When the real-time voltage difference is less than a first preset value, controlling the output current of the charging control circuit to be a first preset current; When the real-time voltage difference is greater than a first preset value and less than a second preset value, controlling the output current of the charging control circuit to be a second preset current, wherein the second preset value is greater than the first preset value, and the value of the second preset current is greater than the value of the first preset current; When the real-time voltage difference is greater than a second preset value, the voltage adjustment chip of the charging control circuit is turned off.

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