CN112039166A - Charging circuit - Google Patents

Charging circuit Download PDF

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Publication number
CN112039166A
CN112039166A CN202010959982.2A CN202010959982A CN112039166A CN 112039166 A CN112039166 A CN 112039166A CN 202010959982 A CN202010959982 A CN 202010959982A CN 112039166 A CN112039166 A CN 112039166A
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CN
China
Prior art keywords
module
battery
voltage
resistor
power
Prior art date
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Granted
Application number
CN202010959982.2A
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Chinese (zh)
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CN112039166B (en
Inventor
余刚
李伊君
李俊林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202010959982.2A priority Critical patent/CN112039166B/en
Publication of CN112039166A publication Critical patent/CN112039166A/en
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Publication of CN112039166B publication Critical patent/CN112039166B/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/00712Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H02J7/007186Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304Overcurrent protection
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068Battery or charger load switching, e.g. concurrent charging and load supply
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The application discloses charging circuit includes: the power supply module, the comparison module, the switch module, the voltage division module, the load module, the battery and the first one-way conduction module; the power module is connected with the first end of the voltage division module, the second end of the voltage division module is connected with the positive input end of the comparison module, the reverse input end of the comparison module is connected with the positive electrode of the battery, the output end of the comparison module is connected with the control end of the switch module, the output end of the switch module is connected with the positive electrode of the battery, and the negative electrode of the battery is connected with the reference ground; the power supply module is also connected with the first end of the load module, and the second end of the load module is connected with the reference ground; the power supply module is also connected with the input end of the switch module; the first end of the load module is also connected with the anode of the battery through the first one-way conduction module. By adopting the technical scheme, the problem that the battery is repeatedly charged and discharged because the battery needs to supply power to the load can be solved after the battery is fully charged.

Description

Charging circuit
Technical Field
The application relates to the field of electronic equipment, in particular to a charging circuit.
Background
In the prior art, when a charger is used for charging a battery in electronic equipment, the battery has the problem of repeated charging and discharging.
Disclosure of Invention
In order to solve the above technical problem, the present application provides a charging circuit, which specifically includes:
according to an aspect of an embodiment of the present application, there is provided a charging circuit including:
the device comprises a power supply module, a comparison module, a switch module, a voltage division module, a load module and a battery;
the power module is connected with the first end of the voltage division module, the second end of the voltage division module is connected with the positive input end of the comparison module, the reverse input end of the comparison module is connected with the positive electrode of the battery, the output end of the comparison module is connected with the control end of the switch module, the output end of the switch module is connected with the positive electrode of the battery, and the negative electrode of the battery is connected with the reference ground;
the power supply module is also connected with the first end of the load module, and the second end of the load module is connected with the reference ground;
the power supply module is also connected with the input end of the switch module;
the first end of the load module is also connected with the anode of the battery through the first one-way conduction module, wherein when the voltage of the battery is greater than the output voltage of the power supply module, the first one-way conduction module is conducted;
the output voltage of the power supply module is greater than the full-electricity voltage of the battery, the full-electricity voltage is greater than the output voltage of the voltage dividing module, and the full-electricity voltage is the voltage when the battery is fully charged;
when the output voltage of the voltage division module is greater than the voltage of the battery, the comparison module outputs a first level, the switch module is switched on, and when the output voltage of the voltage division module is less than the voltage of the battery, the comparison module outputs a second level, and the switch module is switched off.
Preferably, the power module includes:
the power supply interface and the power supply conversion module;
the power interface is connected with the first end of the power conversion module, and the second end of the power conversion module is respectively connected with the first end of the voltage division module, the first end of the load module and the input end of the switch module.
Preferably, the method further comprises the following steps:
a first resistor connected between the output of the switch module and the positive terminal of the battery.
Preferably, the load module includes:
a second resistor;
the first end of the second resistor is respectively connected with the second end of the power conversion module and the first end of the first unidirectional conduction module, wherein the second end of the first unidirectional single-pass module is connected with the anode of the battery;
the second end of the second resistor is connected with the reference ground.
Preferably, the voltage dividing module includes:
a third resistor and a fourth resistor;
the third resistor is connected between the second end of the power supply conversion module and the positive input end of the comparison module;
the first end of the fourth resistor is connected with the reference ground, and the second end of the fourth resistor is connected with the positive input end of the comparison module.
Preferably, the method further comprises the following steps:
and the first unidirectional conduction module is arranged between the first end of the second resistor and the anode of the battery, and when the battery supplies power to the second resistor, the first unidirectional conduction module is conducted.
Preferably, the method further comprises the following steps:
and the second unidirectional conduction module is arranged between the second end of the power conversion module and the first end of the second resistor, and is conducted when the output voltage of the power conversion module supplies power to the second resistor.
Preferably, the method further comprises the following steps:
and the third unidirectional conduction module is arranged between the first resistor and the anode of the battery, and is conducted when the power module charges the battery.
Preferably, the first unidirectional conducting module, the second unidirectional conducting module and the third unidirectional conducting module are diodes.
Preferably, the switch module includes:
a triode, a relay, or a field effect transistor.
Preferably, the comparison module includes:
an operational amplifier.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
in the charging circuit in the embodiment of the application, the forward input end of the comparison module is connected with the second end of the voltage division module, the reverse input end of the comparison module is connected with the positive electrode of the battery, when the battery needs to be charged, the output voltage of the voltage division module is greater than the voltage of the battery, the output end of the comparison module outputs a first level at the moment, and the switch module is switched on, so that the power supply module charges the battery through the switch module; when the battery is fully charged, the output voltage of the voltage division module is smaller than the full-charge voltage of the battery, the output end of the comparison module outputs a second level at the moment, and the switch module is turned off. In addition, because the output voltage of the power supply module is greater than the full-charge voltage of the battery, even if the battery is fully charged, the first one-way conduction module still cannot be conducted, and the power supply module still supplies power for the load module at the moment, the problem that the battery needs to be charged and discharged repeatedly due to the fact that the battery needs to be supplied with power after the battery is fully charged is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be 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 to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a charging circuit according to an embodiment of the present disclosure;
fig. 2 is another schematic structural diagram of a charging circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments, and the illustrative embodiments and descriptions thereof of the present application are used for explaining the present application and do not constitute a limitation to the present application. 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.
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 similar 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.
In the prior art, when a charger is used for charging a battery in an electronic device, after the battery is fully charged, the electronic device is still powered by the battery even if the charger is not disconnected from the battery, and after the battery is powered for a period of time, the charger recharges the battery, so that the battery has the problem of repeated charging and discharging.
In order to solve the above technical problem, according to an aspect of the embodiments of the present application, there is provided an embodiment of a charging circuit, as shown in fig. 1, the charging circuit includes:
the circuit comprises a power supply module 101, a comparison module 102, a switch module 103, a voltage division module 104, a load module 105, a battery 106 and a first unidirectional conducting module 107.
Wherein:
the power module 101 is connected with a first end of the voltage division module 104, a second end of the voltage division module 104 is connected with a forward input end of the comparison module 102, a reverse input end of the comparison module 102 is connected with a positive electrode of the battery 106, an output end of the comparison module 102 is connected with a control end of the switch module 103, an output end of the switch module 103 is connected with a positive electrode of the battery 106, and a negative electrode of the battery 106 is connected with a reference ground;
the power module 101 is further connected to a first terminal of a load module 105, and a second terminal of the load module 105 is connected to ground;
the power supply module 101 is also connected with the input end of the switch module 103;
the first terminal of the load module 105 is further connected to the positive electrode of the battery 106 through a first unidirectional conducting module 107, wherein the first unidirectional conducting module 107 is conducted when the battery 106 supplies power to the load module 105.
The output voltage of the power module 101 is greater than the full-charge voltage of the battery 106, the full-charge voltage is greater than the output voltage of the voltage dividing module 104, and the full-charge voltage is the voltage when the battery 106 is fully charged;
when the output voltage of the voltage dividing module 104 is greater than the voltage of the battery 106, the comparing module 102 outputs a first level, and the switching module 103 is turned on, and when the output voltage of the voltage dividing module 104 is less than the voltage of the battery 106, the comparing module 102 outputs a second level, and the switching module 103 is turned off.
The working principle of the charging circuit is as follows:
when the battery 106 needs to be charged, the voltage of the battery 106 is smaller than the output voltage of the voltage dividing module 104, at this time, the comparing module 102 outputs the first level to control the on-die module 103 to be turned on, and the power module 101 charges the battery 106 through the switch module 103.
In addition, since the output voltage of the power module 101 is greater than the voltage of the battery 106, the load module 105 is powered by the power module 101 when the battery 106 needs to be charged.
When the battery 106 is fully charged, since the full-charge voltage of the battery 106 is greater than the output voltage of the voltage dividing module 104, the comparing module 102 outputs the second level, the mold opening module 103 is controlled to be turned off, and the power module 101 stops charging the battery 106.
In addition, since the output voltage of the power module 101 is greater than the full-charge voltage of the battery 106, even if the battery 106 is fully charged, the first unidirectional conductive module 107 is still turned off, so that the power module 101 supplies power to the load module 105 when the battery 106 is fully charged. It can be seen that the power module 101 supplies power to the battery 106, whether the battery 106 is under-charged or fully charged.
In the charging circuit in the embodiment of the application, the forward input end of the comparison module is connected with the second end of the voltage division module, the reverse input end of the comparison module is connected with the positive electrode of the battery, when the battery needs to be charged, the output voltage of the voltage division module is greater than the voltage of the battery, the output end of the comparison module outputs a first level at the moment, and the switch module is switched on, so that the power supply module charges the battery through the switch module; when the battery is fully charged, the output voltage of the voltage division module is smaller than the full-charge voltage of the battery, the output end of the comparison module outputs a second level at the moment, and the switch module is turned off. In addition, because the output voltage of the power supply module is greater than the full-charge voltage of the battery, even if the battery is fully charged, the first one-way conduction module still cannot be conducted, and the power supply module still supplies power for the load module, so that the problem that the battery needs to be repeatedly charged and discharged because the power supply module needs to supply power to the load after the battery is fully charged is solved.
In other embodiments of the present application, the power module 101 includes:
power source interface and power source conversion module.
Since the charger connected with the power supply module generally outputs 5V-12V direct current voltage, and the rated voltage of the battery is determined, the power supply conversion module is arranged at the power supply module in order to be compatible with the chargers with different output voltages.
In other embodiments of the present application, the voltage divider module 104 includes:
a third resistor and a fourth resistor;
the third resistor is connected between the second end of the power supply conversion module and the positive input end of the comparison module;
the first end of the fourth resistor is connected with the reference ground, and the second end of the fourth resistor is connected with the positive input end of the comparison module.
Wherein the content of the first and second substances,V2for comparing the voltage at the positive input of the module, V1Is the output voltage of the power conversion module, R1Is a third resistance, R2Is a fourth resistor.
Because of the existence of the voltage division module, the voltage of the positive input end of the comparison module is smaller than the output voltage of the power conversion module, and meanwhile, because the voltage of the positive input end of the comparison module is smaller than the full-charge voltage of the battery, the relative size between the voltage of the positive input end of the comparison module and the voltage of the battery can be different according to the difference of the undercharge or the full-charge of the battery, so that the output end of the comparison module can output a first level or a second level to control the switch-on or switch-off of the switch module, and further control the charging or cut-off charging of the battery.
In other embodiments of the present application, the switch module 103 includes:
a triode, a relay, or a field effect transistor.
Wherein:
when the switch module is a triode, the control end of the switch module is the base electrode of the triode, the input end of the switch module is the collector electrode of the triode, and the output end of the switch module is the emitter electrode of the triode;
when the switch module is a field effect transistor, the control end of the switch module is the grid electrode of the field effect transistor, the input end of the switch module is the drain electrode of the field effect transistor, and the output end of the switch module is the source electrode of the field effect transistor.
In other embodiments of the present application, in order to prevent the switch module from being damaged by a large current at the moment when the battery starts to be charged, the charging circuit further includes:
and the first resistor is connected between the output end of the switch module and the anode of the battery.
When the battery is charged, because the voltage of the battery is lower, the current at the moment of charging is very large, the switch module is possibly damaged, and the current is limited by increasing the first resistor so as to avoid the condition of sudden large current.
In other embodiments of the present application, the load module comprises:
a second resistor;
the first end of the second resistor is connected with the second end of the power conversion module and the first end of the first unidirectional conduction module respectively, wherein the second end of the first unidirectional single-pass module is connected with the anode of the battery;
the second end of the second resistor is connected with the ground reference.
In other embodiments of the present application, when the battery supplies power to the second resistor, in order to prevent the battery from wasting power through the first unidirectional conducting module and the voltage dividing module forming a power-on loop, the charging circuit further includes:
and the second unidirectional conduction module is arranged between the second end of the power conversion module and the first end of the second resistor, and is conducted when the output voltage of the power conversion module supplies power to the second resistor.
The second unidirectional conduction module is conducted when the conduction direction of the second unidirectional conduction module is that the output voltage of the power conversion module supplies power to the second resistor, so that the second unidirectional conduction module is cut off when the battery supplies power to the second resistor, and the battery cannot form a conduction branch circuit through the second unidirectional conduction module and the voltage division module.
In other embodiments of the present application, when the battery supplies power to the second resistor, in order to prevent the battery from forming a power-on loop via the first resistor, the switch module having the leakage current, and the voltage dividing module, the charging circuit further includes:
and the third unidirectional conduction module is arranged between the first resistor and the anode of the battery, and is conducted when the battery supplies power to the first resistor.
Because the conduction direction of the third unidirectional conduction module is that when the power module charges the battery, the third unidirectional conduction module is conducted, and therefore when the battery is adopted to supply power to the second resistor, the second unidirectional conduction module is cut off, so that the battery cannot form a conduction branch through the third unidirectional conduction module, the first resistor, the switch module with leakage current and the voltage division module.
In other embodiments of the present application, the first unidirectional conducting module, the second unidirectional conducting module, and the third unidirectional conducting module are diodes.
In other embodiments of the present application, the comparison module comprises:
an operational amplifier.
The positive input end of the operational amplifier and the power supply end of the operational amplifier are respectively connected with the second end of the power supply conversion module, the negative input end of the operational amplifier is connected with the positive electrode of the battery, the output end of the operational amplifier is connected with the control end of the switch module, and the common ground end of the operational amplifier is connected with the reference ground.
According to another aspect of the embodiments of the present application, there is provided an embodiment of a charging circuit, as shown in fig. 2, the charging circuit includes:
the power supply comprises a power supply interface 201, a power supply conversion module 202, a first resistor 203, a second resistor 204, a third resistor 205, a fourth resistor 206, a first diode 207, a second diode 208, a third diode 209, an operational amplifier 210, a battery 211 and a triode 212;
wherein:
the power interface 201 is connected with a first end of the power conversion module 202;
the second end of the power conversion module 202 is connected to the first end of the third resistor 205, the second end of the third resistor 205 is connected to the positive input end of the operational amplifier 210, the negative input end of the operational amplifier 210 is connected to the positive electrode of the battery 211, the output end and the power supply end of the operational amplifier 210 are respectively connected to the emitter of the triode 212, the power supply end of the operational amplifier 210 is respectively connected to the second end of the power conversion module 202, and the common ground end of the operational amplifier 210 is connected to the reference ground;
the second end of the power conversion module 202 is further connected to the anode of a second diode 208, the cathode of the second diode 208 is connected to the first end of the second resistor 204, and the second end of the second resistor 204 is connected to the ground;
the second end of the power conversion module 202 is further connected to a collector of the transistor 212, an emitter of the transistor 212 is connected to the first end of the first resistor 203, the second end of the first resistor 203 is connected to an anode of the third diode 209, a cathode of the third diode 209 is connected to an anode of the battery 211, and a cathode of the battery 211 is connected to the ground;
a first diode 207 is also connected to the positive electrode of the battery 211 and the first end of the second resistor 204.
The working principle of the charging circuit is as follows:
when the power interface 201 is not connected to a power source through a charger, a load (the second resistor 204) is powered by the battery 211, and specifically, a power-on loop is formed by the battery 211, the first diode 207 and the second resistor 204;
when the power interface 201 is connected to a power source through a charger:
the voltage of the second end of the power conversion module 202 is greater than the voltage of the battery 211, the second diode 208 is turned on, the first diode 207 is turned off, and the load (the second resistor 204) is powered by the charger through the power conversion module 202;
meanwhile, the operational amplifier 210 is powered by the power conversion module 202, and compares the voltage at the second end of the third resistor 205 (i.e., the voltage at the positive input end of the operational amplifier 210) with the voltage of the battery 211 (i.e., the voltage at the negative input end of the operational amplifier 210), when the voltage of the battery 211 is smaller than the voltage at the second end of the third resistor 205, the output end of the operational amplifier 210 outputs a first level, at this time, the transistor 212 is turned on, and the power conversion module 202 charges the battery 211 through the transistor 212, the first resistor 203, and the third diode 209, during this process, when the battery 211 starts to be charged, since the voltage of the battery 211 is lower, the charging transient current is larger, so that the current is limited by the current limiting resistor second resistor 203, and the current is prevented from being too large; in addition, because the voltage of the battery 211 cannot suddenly change, the situation that the voltage of the battery 211 is larger than the output voltage of the second end of the third resistor 205 due to the sudden change of the voltage of the battery 211 cannot occur, so that the charging termination is avoided; moreover, since the output voltage of the power conversion module 202 is greater than the voltage of the battery 211, the load (i.e., the second resistor 202) is still powered by the power conversion module 202 during the charging process of the battery 211;
when the battery 211 is fully charged, the voltage of the battery 211 is greater than the voltage of the second end of the third resistor 205, the output end of the operational amplifier 210 outputs a second level, and at this time, the triode 212 is turned off to stop charging the battery 211; at this time, the second diode 208 is still turned on, and the first diode 207 is still turned off, so that the load (i.e., the second resistor 202) is still powered by the power conversion module 202, the voltage of the battery 211 is maintained at the full-power voltage, and the situation that the battery 211 is discharged and then turned on for charging is avoided.
The above description is only for the preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. 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 application. Thus, the present application 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 charging circuit, comprising:
the power supply module, the comparison module, the switch module, the voltage division module, the load module, the battery and the first one-way conduction module;
the power module is connected with the first end of the voltage division module, the second end of the voltage division module is connected with the positive input end of the comparison module, the reverse input end of the comparison module is connected with the positive electrode of the battery, the output end of the comparison module is connected with the control end of the switch module, the output end of the switch module is connected with the positive electrode of the battery, and the negative electrode of the battery is connected with the reference ground;
the power supply module is also connected with the first end of the load module, and the second end of the load module is connected with the reference ground;
the power supply module is also connected with the input end of the switch module;
the first end of the load module is also connected with the anode of the battery through the first one-way conduction module, wherein when the voltage of the battery is greater than the output voltage of the power supply module, the first one-way conduction module is conducted;
the output voltage of the power supply module is greater than the full-electricity voltage of the battery, the full-electricity voltage is greater than the output voltage of the voltage dividing module, and the full-electricity voltage is the voltage when the battery is fully charged;
when the output voltage of the voltage division module is greater than the voltage of the battery, the comparison module outputs a first level, the switch module is switched on, and when the output voltage of the voltage division module is less than the voltage of the battery, the comparison module outputs a second level, and the switch module is switched off.
2. The charging circuit of claim 1, wherein the power module comprises:
the power supply interface and the power supply conversion module;
the power interface is connected with the first end of the power conversion module, and the second end of the power conversion module is respectively connected with the first end of the voltage division module, the first end of the load module and the input end of the switch module.
3. The charging circuit of claim 2, further comprising:
a first resistor connected between the output of the switch module and the positive terminal of the battery.
4. The charging circuit of claim 2, wherein the load module comprises:
a second resistor;
the first end of the second resistor is connected with the second end of the power conversion module and the first end of the first one-way conduction module respectively, and the second end of the first one-way conduction module is connected with the anode of the battery;
the second end of the second resistor is connected with the reference ground.
5. The charging circuit of claim 4, wherein the voltage divider module comprises:
a third resistor and a fourth resistor;
the third resistor is connected between the second end of the power supply conversion module and the positive input end of the comparison module;
the first end of the fourth resistor is connected with the reference ground, and the second end of the fourth resistor is connected with the positive input end of the comparison module.
6. The charging circuit of claim 4, further comprising:
and the second unidirectional conduction module is arranged between the second end of the power conversion module and the first end of the second resistor, and is conducted when the output voltage of the power conversion module supplies power to the second resistor.
7. The charging circuit of claim 6, further comprising:
and the third unidirectional conduction module is arranged between the first resistor and the anode of the battery, and is conducted when the power module charges the battery.
8. The charging circuit of claim 7, wherein the first unidirectional conducting module, the second unidirectional conducting module, and the third unidirectional conducting module are diodes.
9. The charging circuit according to any one of claims 1 to 8, wherein the switching module comprises:
a triode, a relay, or a field effect transistor.
10. The charging circuit of claim 9, wherein the comparison module comprises:
an operational amplifier.
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