CN113872289A - Quick charging power supply management circuit and charging control method - Google Patents

Quick charging power supply management circuit and charging control method Download PDF

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Publication number
CN113872289A
CN113872289A CN202111143805.8A CN202111143805A CN113872289A CN 113872289 A CN113872289 A CN 113872289A CN 202111143805 A CN202111143805 A CN 202111143805A CN 113872289 A CN113872289 A CN 113872289A
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China
Prior art keywords
charging
battery
electrically connected
circuit
control
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Pending
Application number
CN202111143805.8A
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Chinese (zh)
Inventor
简阳
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Anker Innovations Co Ltd
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Anker Innovations Co Ltd
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Priority to CN202111143805.8A priority Critical patent/CN113872289A/en
Publication of CN113872289A publication Critical patent/CN113872289A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The invention relates to a quick charge power supply management circuit and a charge control method, wherein the quick charge power supply management circuit comprises: the device comprises a battery, a sampling circuit, a control module, a multiplying power control circuit and a charging management module; the sampling end of the sampling circuit is electrically connected with the battery, and the output end of the sampling circuit is electrically connected with the sampling input end of the control module; the control output end of the control module is electrically connected with the control input end of the multiplying power control circuit, and the enable end of the control module is electrically connected with the enable end of the charging management module; the output end of the multiplying power control circuit is electrically connected with the control end of the charging management module; the battery connecting end of the charging management module is electrically connected with the battery. The embodiment of the application can automatically reduce the charging rate of the battery before the voltage at two ends of the battery reaches the full-charge voltage, can be quickly and really fully charged, prolongs the battery endurance time, and avoids the phenomenon that the battery is too large in floating pressure due to the overhigh charging rate when the battery is quickly charged and cannot be really fully charged.

Description

Quick charging power supply management circuit and charging control method
Technical Field
The application relates to the technical field of electronic information, in particular to a quick charging power supply management circuit and a charging control method.
Background
With the rapid development of battery technology, rapid charging of batteries is commonly used. In wearing class's product in recent years, like earphone, wrist-watch, bracelet etc., the application of quick charge technique can be very big improvement user experience.
The problems that exist at present are: when a high-rate battery is used, for example, 2C or 3C, the internal resistance R of the battery causes a floating voltage U-R during charging, and when R is constant, the larger the current I, the larger the floating voltage U. In this case, I is 2C or 3C, 4C. Wherein, C represents the capacity of the rechargeable battery in the battery charging field, and represents the discharging current by taking the capacity value in discharging, the charging current is the same as the battery capacity and generally represented by 1C, 2C represents the current charged by 2 multiplying power, 3C represents the current charged by 3 multiplying power, and so on; for example, assuming that 1000mA of a 1000mAH battery is represented by 1C, 2C represents 2000mA of a 2-rate charge current and 3C represents 3000mA of a 3-rate charge current. The floating voltage can cause the voltage of the battery to be detected in a virtual high manner, so that the battery is not fully charged, the charging management chip (IC) stops charging, and finally the electric quantity of the battery cannot be fully charged, thereby influencing the endurance time of the battery.
Disclosure of Invention
In order to solve the technical problem or at least partially solve the technical problem, the present application provides a fast charging power management circuit and a charging control method.
In a first aspect, the present application provides a fast charging power management circuit, including: the device comprises a battery, a sampling circuit, a control module, a multiplying power control circuit and a charging management module;
the sampling end of the sampling circuit is electrically connected with the battery, the output end of the sampling circuit is electrically connected with the sampling input end of the control module, and the sampling circuit is used for sampling voltages at two ends of the battery;
the control output end of the control module is electrically connected with the control input end of the multiplying power control circuit, the enable end of the control module is electrically connected with the enable end of the charging management module, and the control module is used for setting the control output end to be in a high-resistance state when the voltage values at the two ends of the battery reach a preset voltage;
the output end of the multiplying power control circuit is electrically connected with the control end of the charging management module, the multiplying power control circuit is used for outputting charging current with a preset first charging multiplying power to the charging management module, and the first charging multiplying power is smaller than the charging multiplying power of the battery when the voltage value at the two ends of the battery is smaller than a preset voltage;
the battery connecting end of the charging management module is electrically connected with the battery, and the charging management module is used for charging the battery by using the charging current with the first charging multiplying power.
Optionally, the magnification control circuit includes: a first resistor and a second resistor;
one end of the first resistor is grounded, and the other end of the first resistor is electrically connected with the output end of the multiplying power control circuit;
one end of the second resistor is connected with the control end of the multiplying power control circuit, and the other end of the second resistor is electrically connected with the output end of the multiplying power control circuit.
Optionally, the sampling circuit includes: a third resistor and a fourth resistor;
one end of the third resistor is electrically connected with the sampling end of the sampling circuit, and the other end of the third resistor is electrically connected with the output end of the sampling circuit;
one end of the fourth resistor is electrically connected with the other end of the third resistor, and the other end of the fourth resistor is grounded.
Optionally, the charging management module includes: a charging management chip having an enable input terminal, a battery connection terminal, and a charging current setting terminal;
the charging management module comprises a charging management chip, a charging current setting end and a charging control end, wherein the charging management chip is provided with an enabling input end and a charging control end, the enabling input end is electrically connected with the enabling end of the charging management module, the charging control end is electrically connected with the charging control end of the charging management chip, and the charging control end is electrically connected with the battery connecting end of the charging management module.
Optionally, the charging management chip further has a voltage input terminal;
and a fifth resistor is connected between the enable input end of the charging management chip and the voltage input end of the charging management chip.
Optionally, the fast charging power management circuit further includes: a power supply protection circuit; the charging management module comprises a voltage input end;
the power supply end of the power supply protection circuit is electrically connected with an external power supply, and the output end of the power supply protection circuit is electrically connected with the voltage input end of the charging management module.
Optionally, the power supply protection circuit further comprises: a diode, a zener diode, and a capacitor;
the anode of the diode is electrically connected with the power supply end of the power supply protection circuit, the cathode of the diode is electrically connected with the output end of the power supply protection circuit, the cathode of the voltage stabilizing diode is grounded, the anode of the voltage stabilizing diode is electrically connected with the power supply end of the power supply protection circuit, the first connecting end of the capacitor is grounded, and the second connecting end of the capacitor is electrically connected with the output end of the power supply protection circuit.
In a second aspect, the present application provides a charging control method applied to a control module in a fast charging power management circuit according to any one of the first aspects, where the method includes:
acquiring voltage values of two ends of the battery acquired by the sampling circuit;
determining whether the voltage value at two ends of the battery is greater than or equal to a preset voltage, wherein the preset voltage is less than the full-electricity voltage of the battery;
if the voltage values at the two ends of the battery are larger than or equal to the preset voltage, outputting an enabling signal to a charging management module, and setting the control output end of the control module to be in a high-resistance state, so that a multiplying power control circuit outputs the charging current of a preset first charging multiplying power to the charging management module, and further enabling the charging management module to utilize the charging current of the first charging multiplying power to charge the battery, wherein the first charging multiplying power is smaller than the charging multiplying power of the battery when the voltage values at the two ends of the battery are smaller than the preset voltage.
Optionally, the method further comprises:
if the voltage values at the two ends of the battery are smaller than the preset voltage, setting the control output end of the control module to be in a low-impedance state, so that the multiplying power control circuit outputs the charging current of a preset second charging multiplying power to the charging management module, and further the charging management module charges the battery with the charging current of the second charging multiplying power, wherein the second charging multiplying power is larger than the first charging multiplying power.
Optionally, the method further comprises:
when the charging management module outputs an enabling signal, the control output end is set to be in a high-resistance state, so that the multiplying power control circuit outputs charging current of a preset first charging multiplying power to the charging management module, and the charging management module charges the battery with the charging current of the first charging multiplying power.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the embodiment of the application sets the control output end to be in a high-resistance state when the voltage values at the two ends of the battery reach the preset voltage smaller than the full-electricity voltage of the battery through the control module, so that the multiplying power control circuit outputs the charging current of the preset first charging multiplying power to the charging management module, the charging management module charges the battery by using the charging current of the first charging multiplying power, the first charging multiplying power is smaller than the charging multiplying power of the battery when the voltage values at the two ends of the battery are smaller than the preset voltage, the charging multiplying power of the battery can be automatically reduced before the voltage at the two ends of the battery reaches the full-electricity voltage, the battery can be rapidly and truly fully charged, the battery endurance time is prolonged, and the situation that the floating voltage is too large due to the fact that the charging multiplying power is too high when the battery is rapidly charged and the battery cannot be truly fully charged is avoided.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a circuit diagram of a fast charging power management circuit according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of a multiplying power control circuit, a charging management module and a power supply protection circuit according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a sampling circuit according to an embodiment of the present application;
fig. 4 is a flowchart of a charging control method according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
When a high-rate charge such as 2C or 3C is used, the internal resistance R of the battery causes a floating pressure U ═ ir during the charge, and when R is constant, the larger I, the larger the floating pressure. In this case, I is 2C or 3C, 4C. The floating voltage can cause the voltage of the battery to be detected in a virtual high mode, so that the battery is not fully charged, the charging management chip (IC) stops charging, finally, the electric quantity of the battery cannot be fully charged, and the battery endurance time is influenced.
As shown in fig. 1, the fast charging power management circuit includes: the device comprises a battery 11, a sampling circuit 12, a control module 13, a multiplying power control circuit 14 and a charging management module 15;
the sampling end of the sampling circuit 12 is electrically connected with the battery 11, the output end of the sampling circuit 12 is electrically connected with the sampling input end of the control module 13, and the sampling circuit 12 is used for sampling voltages at two ends of the battery 11;
in this embodiment of the present invention, the sampling circuit 12 may be a voltage sampling circuit, the control module 13 includes a processor, and a sampling input end of the control module 13 corresponds to the VBAT _ ADC in fig. 1.
The control output end of the control module 13 is electrically connected with the control input end of the multiplying power control circuit 14, the enable end of the control module 13 is electrically connected with the enable end of the charging management module 15, and the control module 13 is used for setting the control output end to be in a high-resistance state when the voltage values at the two ends of the battery 11 reach a preset voltage;
in the embodiment of the present invention, when the input of the multiplying power control circuit 14 is in a high impedance state, the current on the high-precision resistor for adjusting the charging multiplying power in the multiplying power control circuit 14 is reduced, so that the charging management module 15 outputs the charging current of the first charging multiplying power.
The control output end of the control module 13 corresponds to CH _ T in fig. 1, and the enable end of the control module 13 corresponds to CH _ EN in fig. 1.
The output end of the multiplying power control circuit 14 is electrically connected with the control end of the charging management module 15, the multiplying power control circuit 14 is used for outputting a charging current with a preset first charging multiplying power to the charging management module 15, and the first charging multiplying power is smaller than the charging multiplying power of the battery 11 when the voltage value at the two ends of the battery 11 is smaller than the preset voltage;
the control terminal of the charging management module 15 corresponds to ISET in fig. 1.
The battery connection terminal of the charging management module 15 is electrically connected to the battery 11, and the charging management module 15 is configured to charge the battery 11 with a charging current at a first charging rate.
The battery connection of the charge management module 15 corresponds to VBAT in fig. 1.
In the embodiment of the present application, when the voltage value at the two ends of the battery 11 reaches the preset voltage smaller than the full-power voltage of the battery 11 by setting the control module 13, the control output end is set to the high-resistance state, so that the rate control circuit 14 outputs the charging current of the preset first charging rate to the charging management module 15, and further, the charging management module 15 charges the battery 11 by using the charging current of the first charging rate, where the first charging rate is smaller than the charging rate of the battery 11 when the voltage value at the two ends of the battery 11 is smaller than the preset voltage, so as to realize that the voltage at the two ends of the battery 11 does not reach the full-power voltage, the charging rate of the battery 11 can be automatically reduced, thereby rapidly and truly fully charging, the duration of the battery 11 is prolonged, and it is avoided that the floating voltage caused by the excessively high charging rate when the battery 11 is rapidly charged, and the battery cannot be truly fully charged.
In a further embodiment of the present application, as shown in fig. 2, the magnification control circuit 14 includes: a first resistor R1 and a second resistor R2;
one end of the first resistor R1 is grounded, and the other end of the first resistor R1 is electrically connected with the output end of the multiplying power control circuit 14;
one end of the second resistor R2 is connected to the control end of the magnification control circuit 14, and the other end of the second resistor R2 is electrically connected to the output end of the magnification control circuit 14.
The magnitude of the charging current is set by the magnitude of the first resistor R1, and the charging management module 15 can be set to output charging currents of different charging rates to the battery 11 through the first resistor R1.
In still another embodiment of the present application, as shown in fig. 3, the sampling circuit 12 includes: a third resistor R3 and a fourth resistor R4;
one end of the third resistor R3 is electrically connected with the sampling end of the sampling circuit 12, and the other end of the third resistor R3 is electrically connected with the output end of the sampling circuit 12;
one end of the fourth resistor R4 is electrically connected to the other end of the third resistor R3, and the other end of the fourth resistor R4 is grounded.
In another embodiment of the present application, the charging management module 15 includes: the charging management chip is provided with an enabling input end, a battery connecting end and a charging current setting end;
the enable input end of the charging management chip is electrically connected with the enable end of the charging management module 15, the battery connecting end of the charging management chip is electrically connected with the battery connecting end of the charging management module 15, and the charging current setting end of the charging management chip is electrically connected with the control end of the charging management module 15.
In this embodiment, the charging management chip may be an ETA4056 battery charging chip (IC), and since the ETA4056 battery charging chip is a constant current charging chip, the charging current output by the charging management chip is a constant current.
In yet another embodiment of the present application, the charge management chip further has a voltage input;
and a fifth resistor R5 is connected between the enable input end of the charge management chip and the voltage input end of the charge management chip.
In another embodiment of the present application, the fast charging power management circuit further includes: a power supply protection circuit 16; the charge management module 15 includes a voltage input terminal;
the power supply end of the power supply protection circuit 16 is electrically connected with an external power supply, and the output end of the power supply protection circuit 16 is electrically connected with the voltage input end of the charging management module 15.
In yet another embodiment of the present application, a power supply protection circuit includes: a diode D1, a zener diode D2, and a capacitor C1;
the anode of the diode D1 is electrically connected to the power supply end of the power supply protection circuit 16, the cathode of the diode D1 is electrically connected to the output end of the power supply protection circuit 16, the cathode of the zener diode D2 is grounded, the anode of the zener diode D2 is electrically connected to the power supply end of the power supply protection circuit 16, the first connection end of the capacitor C1 is grounded, and the second connection end of the capacitor C1 is electrically connected to the output end of the power supply protection circuit 16.
The voltage input end of the charging management chip can be protected from being damaged by reverse voltage or large voltage through the diode D1 and the voltage stabilizing diode D2.
In another embodiment of the present application, there is further provided a charging control method applied to the control module 13 in the fast charging power management circuit according to the foregoing embodiment, as shown in fig. 4, the charging control method includes:
step S101, acquiring voltage values at two ends of the battery 11 acquired by the sampling circuit 12;
step S102, determining whether the voltage values at two ends of the battery 11 are greater than or equal to a preset voltage, wherein the preset voltage is less than the full-electricity voltage of the battery 11;
in the embodiment of the present application, the preset voltage may be set to be close to the full-charge voltage of the battery 11, such as: the difference between the full-electric voltage and the preset voltage is less than 0.5V, and for example, the preset voltage may be 4V or 4.2V, assuming that the full-electric voltage is 4.5V.
Step S103, if the voltage values at the two ends of the battery 11 are greater than or equal to the preset voltage, outputting an enable signal to the charging management module 15, and setting the control output terminal of the control module 13 to be in a high impedance state, so that the rate control circuit 14 outputs a charging current with a preset first charging rate to the charging management module 15, and further the charging management module 15 charges the battery 11 by using the charging current with the first charging rate, where the first charging rate is smaller than the charging rate of the battery 11 when the voltage values at the two ends of the battery 11 are smaller than the preset voltage.
In the embodiment of the present invention, the first charging rate is determined according to the capacity of the battery 11, and the charging current of the first charging rate may be generally set to 1C, that is, a charging current equal to the capacity of the battery 11.
In the embodiment of the application, when the voltage values at the two ends of the battery 11 reach the preset voltage smaller than the full-electricity voltage of the battery 11, the control output end is set to be in the high-resistance state, the rate control circuit 14 outputs the charging current of the preset first charging rate to the charging management module 15, and then the charging management module 15 charges the battery 11 by using the charging current of the first charging rate, the first charging rate is smaller than the charging rate of the battery 11 when the voltage values at the two ends of the battery 11 are smaller than the preset voltage, so that the voltage at the two ends of the battery 11 can automatically reduce the charging rate of the battery 11 when the full-electricity voltage is not reached, the battery 11 can be rapidly and really fully charged, the endurance time of the battery 11 is prolonged, and the battery 11 is prevented from being excessively high in charging rate when the battery is rapidly charged, the resulting floating voltage is excessively large, and cannot be really fully charged.
In another embodiment of the present application, the charge control method further includes:
step S104, if the voltage value at the two ends of the battery 11 is smaller than the preset voltage, the control output end of the control module 13 is set to the low impedance state, so that the rate control circuit 14 outputs the preset charging current with the second charging rate to the charging management module 15, and further the charging management module 15 charges the battery 11 with the charging current with the second charging rate, where the second charging rate is greater than the first charging rate.
In the embodiment of the present application, the charging current of the second charging rate may be 2C or 3C, that is, the current of the battery 11 that is 2 times or 3 times the capacity, and the like.
When the voltage at the two ends of the battery 11 does not reach the preset voltage, the charging management module 15 can be controlled to charge the battery 11 at the second charging rate larger than the first charging rate, so that the charging speed is increased.
In another embodiment of the present application, the charge control method further includes:
when the enable signal is output to the charging management module 15, and when the enable signal is output to the charging management module 15, the control output terminal is set to the high impedance state, so that the rate control circuit 14 outputs the charging current of the preset first charging rate to the charging management module 15, and further, the charging management module 15 charges the battery 11 with the charging current of the first charging rate.
In the embodiment of the present application, when outputting the enable signal to the charging management module 15, i.e. when starting charging, the charging current with the lower first charging rate charges the battery 11, and when starting charging, the charging current with the lower first charging rate charges the battery 11, so that it can be ensured that the battery 11 is not full of electricity due to the fact that the floating voltage charged with the high rate leads to the wrong determination of the charging management module 15 when the battery 11 is full, and charging is not started.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A fast charging power management circuit, comprising: the device comprises a battery (11), a sampling circuit (12), a control module (13), a multiplying power control circuit (14) and a charging management module (15);
the sampling end of the sampling circuit (12) is electrically connected with the battery (11), the output end of the sampling circuit (12) is electrically connected with the sampling input end of the control module (13), and the sampling circuit (12) is used for sampling the voltage at two ends of the battery (11);
the control output end of the control module (13) is electrically connected with the control input end of the multiplying power control circuit (14), the enable end of the control module (13) is electrically connected with the enable end of the charging management module (15), the control module (13) is used for setting the control output end to be in a high-resistance state when the voltage value of the two ends of the battery (11) is greater than or equal to a preset voltage, and the preset voltage is less than the full-power voltage of the battery (11);
the output end of the multiplying power control circuit (14) is electrically connected with the control end of the charging management module (15), the multiplying power control circuit (14) is used for outputting charging current with a preset first charging multiplying power to the charging management module (15), and the first charging multiplying power is smaller than the charging multiplying power of the battery (11) when the voltage value at the two ends of the battery (11) is smaller than the preset voltage;
the battery connection end of the charging management module (15) is electrically connected with the battery (11), and the charging management module (15) is used for charging the battery (11) by using the charging current with the first charging rate.
2. The fast charge power management circuit according to claim 1, wherein the rate control circuit (14) comprises: a first resistor (R1) and a second resistor (R2);
one end of the first resistor (R1) is grounded, and the other end of the first resistor (R1) is electrically connected with the output end of the multiplying power control circuit (14);
one end of the second resistor (R2) is connected with the control end of the multiplying power control circuit (14), and the other end of the second resistor (R2) is electrically connected with the output end of the multiplying power control circuit (14).
3. The fast charge power management circuit according to claim 1, wherein the sampling circuit (12) comprises: a third resistor (R3) and a fourth resistor (R4);
one end of the third resistor (R3) is electrically connected with the sampling end of the sampling circuit (12), and the other end of the third resistor (R3) is electrically connected with the output end of the sampling circuit (12);
one end of the fourth resistor (R4) is electrically connected to the other end of the third resistor (R3), and the other end of the fourth resistor (R4) is grounded.
4. The fast charging power management circuit according to claim 1, wherein the charging management module (15) comprises: a charging management chip having an enable input terminal, a battery connection terminal, and a charging current setting terminal;
the charging management device comprises a charging management chip, a charging management module (15), a battery connecting end and a control end, wherein the charging management chip is provided with an enabling input end and an enabling end, the enabling input end is electrically connected with the charging management module (15), the battery connecting end is electrically connected with the battery connecting end of the charging management module (15), and the charging current setting end is electrically connected with the control end of the charging management module (15).
5. The fast charging power management circuit of claim 4, wherein the charging management chip further has a voltage input;
and a fifth resistor (R5) is connected between the enable input end of the charge management chip and the voltage input end of the charge management chip.
6. The fast charge power management circuit of claim 1, further comprising: a power supply protection circuit (16); the charging management module (15) comprises a voltage input terminal;
the power supply protection circuit (16) is characterized in that a power supply end is electrically connected with an external power supply, and an output end of the power supply protection circuit (16) is electrically connected with the voltage input end of the charging management module (15).
7. The fast charge power management circuit of claim 6 wherein the power protection circuit further comprises: a diode (D1), a zener diode (D2), and a capacitor (C1);
the anode of the diode (D1) is electrically connected with the power supply end of the power supply protection circuit (16), the cathode of the diode (D1) is electrically connected with the output end of the power supply protection circuit (16), the cathode of the voltage stabilizing diode (D2) is grounded, the anode of the voltage stabilizing diode (D2) is electrically connected with the power supply end of the power supply protection circuit (16), the first connection end of the capacitor (C1) is grounded, and the second connection end of the capacitor (C1) is electrically connected with the output end of the power supply protection circuit (16).
8. A charging control method applied to a control module (13) in a fast charging power management circuit according to any one of claims 1 to 7, the method comprising:
acquiring voltage values of two ends of the battery (11) acquired by the sampling circuit (12);
determining whether a voltage value across the battery (11) is greater than or equal to a preset voltage, the preset voltage being less than a full-charge voltage of the battery (11);
if the voltage values at the two ends of the battery (11) are larger than or equal to the preset voltage, an enabling signal is output to the charging management module (15), and the control output end of the control module (13) is set to be in a high-resistance state, so that the multiplying power control circuit (14) outputs the charging current of the preset first charging multiplying power to the charging management module (15), the charging management module (15) further charges the battery (11) by using the charging current of the first charging multiplying power, and the first charging multiplying power is smaller than the charging multiplying power of the battery (11) when the voltage values at the two ends of the battery (11) are smaller than the preset voltage.
9. The charge control method according to claim 8, characterized by further comprising:
if the voltage value at the two ends of the battery (11) is smaller than the preset voltage, setting the control output end of the control module (13) to be in a low-resistance state, so that the multiplying power control circuit (14) outputs the charging current of a preset second charging multiplying power to the charging management module (15), and further the charging management module (15) charges the battery (11) with the charging current of the second charging multiplying power, wherein the second charging multiplying power is larger than the first charging multiplying power.
10. The charge control method according to claim 8, characterized by further comprising:
when the enable signal is output to the charging management module (15), the control output end is set to be in a high-resistance state, so that the multiplying power control circuit (14) outputs a charging current with a preset first charging multiplying power to the charging management module (15), and the charging management module (15) charges the battery (11) with the charging current with the first charging multiplying power.
CN202111143805.8A 2021-09-28 2021-09-28 Quick charging power supply management circuit and charging control method Pending CN113872289A (en)

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