CN114552680A - Charging module and electronic equipment - Google Patents

Charging module and electronic equipment Download PDF

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Publication number
CN114552680A
CN114552680A CN202011295727.9A CN202011295727A CN114552680A CN 114552680 A CN114552680 A CN 114552680A CN 202011295727 A CN202011295727 A CN 202011295727A CN 114552680 A CN114552680 A CN 114552680A
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China
Prior art keywords
voltage
battery pack
charging
battery
switch
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CN202011295727.9A
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Chinese (zh)
Inventor
于扎根
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Oneplus Technology Shenzhen Co Ltd
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Oneplus Technology Shenzhen Co Ltd
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Priority to CN202011295727.9A priority Critical patent/CN114552680A/en
Publication of CN114552680A publication Critical patent/CN114552680A/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
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The embodiment of the invention relates to the technical field of charging, and discloses a charging module and electronic equipment, wherein the charging module comprises: the charging module provided by the embodiment of the invention carries out linear charging by adjusting the output of the voltage reducing circuit, so that full charging, high charging speed and less heat generation are realized.

Description

Charging module and electronic equipment
Technical Field
The embodiment of the invention relates to the technical field of charging, in particular to a charging module and electronic equipment.
Background
Along with the increasingly higher portability requirement of users for carrying electronic equipment in the market, the volume of the portable electronic equipment is designed to be smaller and smaller, in the design of a power supply, batteries with high energy density, such as lithium batteries, are also generally used as the power supply, and the batteries generally occupy more volume compared with an integrated circuit structure, and the capacity of the batteries is in direct proportion to the volume, so that the volume and the battery capacity of the electronic equipment are generally selected.
At present, the battery capacity of a portable electronic device with a small volume, such as a Wireless bluetooth headset (TWS), is generally below 40mAh due to the limitation of the overall volume, and in order to fully use the battery capacity, the battery must be fully charged (the current of the normal battery charging cutoff current is 0.05C), that is, the charging cutoff current is about 2mA-4 mA. At present, only a linear charging scheme can meet the requirement, and the linear charging scheme has the problems of high current, easy heating and low charging speed.
Disclosure of Invention
In view of the foregoing defects in the prior art, an object of the embodiments of the present invention is to provide a charging module and an electronic device that can achieve full charge, fast charging, and less heat generation.
The purpose of the embodiment of the invention is realized by the following technical scheme:
in order to solve the foregoing technical problem, in a first aspect, an embodiment of the present invention provides a charging module applied to an electronic device, where the electronic device includes a battery pack, and the charging module includes:
the output end of the battery charging switch is used for being connected with the battery pack;
the input end of the voltage reduction circuit is connected with a direct current power supply, and the output end of the voltage reduction circuit is connected with the input end of the battery charging switch;
the voltage sampling module comprises two sampling ports which are respectively connected with the input end and the output end of the battery charging switch, wherein one sampling port is used for collecting the output voltage of the direct-current power supply after passing through the voltage reduction circuit, and the other sampling port is used for collecting the voltage of the battery pack;
the controller comprises a data port connected with the voltage sampling module and a control port connected with the battery charging switch and the control end of the voltage reduction circuit, the controller is configured to open the battery charging switch when the battery pack needs to be charged, and linearly adjust the output voltage according to the collected voltage of the battery pack and the voltage difference between the output voltage and the voltage of the battery pack, so that the direct-current power supply charges the battery pack through the voltage reduction circuit.
In some embodiments, a control terminal of the battery charging switch is connected to a first control port of the controller, and the controller is configured to control the battery charging switch to be turned on and operate in a linear impedance region through the first control port when it is determined that the battery pack needs to be charged.
In some embodiments, the voltage reduction circuit includes:
the input end of the first switching tube is used for being connected with the direct-current power supply, and the control end of the first switching tube is connected with the second control port of the controller;
the input end of the second switching tube is connected with the output end of the first switching tube, the control end of the second switching tube is connected with the third control port of the controller, and the output end of the second switching tube is grounded;
the controller is configured to open the first switch tube when the battery pack needs to be charged, and adjust the conduction time of the second switch tube according to the collected voltage of the battery pack and the voltage difference between the output voltage and the voltage of the battery pack, so as to linearly adjust the magnitude of the output voltage.
In some embodiments, the voltage reduction circuit further comprises:
and one end of the first inductor is connected with the output end of the first switch tube and the input end of the second switch tube, and the other end of the first inductor is connected with the input end of the battery charging switch.
In some embodiments, the voltage reduction circuit further comprises:
and one end of the first capacitor is connected with the input end of the battery charging switch and the other end of the first inductor, and the other end of the first capacitor is grounded.
In some embodiments, a voltage difference between the output voltage and a voltage of the battery pack is less than or equal to 0.1 volts.
In some embodiments, the first switch tube, the second switch tube, the third switch tube and the battery charging switch are MOS tubes or triodes.
In order to solve the above technical problem, in a second aspect, an embodiment of the present invention provides an electronic device, including:
a battery pack, and,
the charging module according to the first aspect, wherein an input terminal of the charging module is used for connecting a direct current power supply, and an output terminal of the charging module is connected with the battery pack.
In some embodiments, the electronic device is a wireless bluetooth headset.
In some embodiments, the battery is a lithium battery.
Compared with the prior art, the invention has the beneficial effects that: in contrast to the prior art, an embodiment of the present invention provides a charging module applied to an electronic device, where the charging module includes: the charging module provided by the embodiment of the invention carries out a linear charging mode by adjusting the output of the voltage reducing circuit, the full charge is realized, the charging speed is high, and the heat emission is less.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
Fig. 1 is a schematic diagram of an application environment of a charging module according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a charging module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a charging module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will aid those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any manner. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions. Also, when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
At present, charging schemes for lithium batteries in electronic devices on the market can be mainly divided into switch charging and linear charging.
The scheme of switch charging controls whether the charging module is charged or not by directly controlling at least one switching tube, the charging efficiency is high (more than 90%), the system heat dissipation is low, and the temperature rise of the whole machine is controllable, but the cut-off current of the switch charging is basically more than 20mA, so that the full-charging requirement of electronic equipment with small battery capacity such as a wireless Bluetooth headset TWS (the cut-off current is usually about 2mA-4 mA) can not be met. Although the switch charger can meet the problems of quick charging and no heating of the battery of the electronic equipment, the problem of full charging of the electronic equipment cannot be solved, the battery capacity of the electronic equipment cannot be fully utilized, and the requirement of a user on the whole continuous flight time cannot be met.
The linear charging scheme controls the charging current by controlling the impedance of a switching tube connected in parallel with the battery pack, the output current of the charging module is basically consistent with the charging current of the battery, the accuracy control of the charging cut-off current is easy, and the cut-off of 2mA (0.05C) can be realized, so that the full-charging cut-off requirement of the battery of most small-battery-capacity electronic equipment is met. But linear charging bulk heat dissipation P ═ VBUS-VBAT)*IChargeThe charging efficiency in the constant current charging stage is less than 70%, the temperature rise of the electronic equipment can exceed 10 ℃ due to the charging current exceeding 100mA, and if the electronic equipment is close-fitting electronic equipment, a human body can easily feel the heating condition due to the temperature rise exceeding 7 ℃, so that the charging current cannot be too large when a linear charging scheme is adopted. The linear charging scheme can satisfy the problem of full charge of electronic equipment with a small-capacity battery, but cannot solve the problem of quick charge and cannot satisfy the requirement of a user on quick charge.
In order to solve the problem that the conventional charging module cannot give consideration to both quick charging and full charging and reduce heating, the embodiment of the invention provides a novel charging module, which combines the advantages of linear charging and switch charging, and realizes linear charging by adjusting the output mode of a voltage reduction circuit according to the voltage of a battery pack acquired by a voltage sampling module and the voltage difference between the output voltage of the voltage reduction circuit and the voltage of the battery pack and the acquired voltage data by a controller, so that the requirements of quick charging, no heating and full charging of a battery or the battery pack in electronic equipment are effectively met. Fig. 1 is a schematic diagram of an application environment of a charging module according to an embodiment of the present invention, where the application environment includes: an electronic device 200, the electronic device 200 comprising: the battery pack comprises a battery pack B + and a charging module 100, wherein the input end of the charging module 100 is used for DC connection of a direct current power supply, and the output end of the charging module 100 is connected with the battery pack B +.
The battery pack B + comprises at least one battery, and the battery pack B + can be a manganese-zinc battery, a lead storage battery, a lithium battery and the like. Preferably, the battery pack B + may be a battery material with a high energy density, such as a lithium battery, and the type, kind, number and size of the battery pack B + may be set according to the actual kind of the electronic device 200 and the requirement for the battery capacity.
The electronic equipment can be a mobile phone, a tablet, a notebook computer, a bracelet, a camera, an earphone such as a wireless Bluetooth earphone, a charger and the like, and is internally provided with a battery as a power supply. The charging module provided by the embodiment of the invention has a better and obvious improvement effect on the electronic equipment with the small-capacity battery.
Specifically, the charging module 100 provided in the embodiment of the present invention is further described below with reference to the drawings.
An embodiment of the present invention provides a charging module, please refer to fig. 2, which shows a schematic block diagram of the charging module according to the embodiment of the present invention, where the charging module 100 may be applied to the electronic device 200, where the electronic device 200 includes a battery pack B +, and the charging module 100 includes: battery charging switch K, voltage dropping circuit 110, voltage sampling module 120 and controller 130.
The output end of the battery charging switch K is used for being connected with the battery pack B +; the battery charging switch K is a switch directly used for controlling whether the battery pack B + is charged, preferably, an MOS transistor is selected as the battery charging switch K, which includes three working states, when the battery charging switch K works in a saturation region, the charging module 100 passes through the switch charging circuit 110 to rapidly charge the battery pack B + and when the battery charging switch K works in a linear impedance region, the charging module 100 passes through the linear charging circuit 120 to slowly charge the battery pack B + and when the battery charging switch K works in a cutoff region, the charging module 100 does not charge the battery pack B +. Preferably, the battery charging switch K is operated in a linear impedance region during charging, thereby achieving linear charging.
The input end of the voltage reduction circuit 110 is used for being connected with a direct current power supply DC, and the output end of the voltage reduction circuit is connected with the input end of the battery charging switch K; the charging module 100 charges the battery B + through the voltage-reducing circuit 110. The output voltage of the voltage reduction circuit 110 is adjustable, and linear charging can be realized by adjusting the output voltage.
The voltage sampling module 120 includes two sampling ports respectively connected to the input terminal and the output terminal of the battery charging switch K, one of the sampling ports is used to collect the output voltage of the DC power supply DC after passing through the voltage dropping circuit 110, and the other sampling port is used to collect the voltage of the battery pack B +. Preferably, the voltage sampling module 120 may employ an analog-to-digital converter ADC.
The controller 130 includes a data port connected to the voltage sampling module 120, and a control port connected to the battery charging switch K and the control terminal of the voltage dropping circuit 110, and the controller 130 is configured to open the battery charging switch K when the battery pack B + needs to be charged, and linearly adjust the magnitude of the output voltage according to the collected voltage of the battery pack B + and the voltage difference between the output voltage and the voltage of the battery pack B +, so that the DC power supply DC charges the battery pack B + through the voltage dropping circuit 110.
In some embodiments, please refer to fig. 3, which illustrates an electrical connection structure of a charging module according to an embodiment of the present invention, wherein a control terminal of the battery charging switch K is connected to a first control port 10 of the controller 130, and the controller 130 is configured to control the battery charging switch K to be turned on and operate in a linear impedance region through the first control port 10 when it is determined that the battery B + needs to be charged.
In some embodiments, with continued reference to fig. 3, the voltage-reducing circuit 110 includes: a first switching tube Q1, an input end of which is used for being connected with the direct current power supply DC, and a control end of which is connected with the second control port 20 of the controller 130; a second switch Q2, an input terminal of which is connected to the output terminal of the first switch Q1, a control terminal of which is connected to the third control port 30 of the controller 130, and an output terminal of which is grounded; the controller 130 is configured to open the first switch tube Q1 when the battery B + needs to be charged, and adjust the on-time of the second switch tube Q2 according to the collected voltage of the battery B + and the voltage difference between the output voltage and the voltage of the battery B +, so as to linearly adjust the magnitude of the output voltage.
In some embodiments, with continued reference to fig. 3, the voltage-reducing circuit 110 further includes: a first inductor L1, one end of which is connected to the output end of the first switch tube Q1 and the input end of the second switch tube Q2, and the other end of which is connected to the input end of the battery charging switch K.
In some embodiments, with continued reference to fig. 3, the voltage-reducing circuit 110 further includes: and a first capacitor C1, one end of which is connected to the input terminal of the battery charging switch K and the other end of the first inductor L1, and the other end of which is grounded.
In some embodiments, a voltage difference between the output voltage and a voltage of the battery pack is less than or equal to 0.1 volts. In the embodiment of the present invention, it is necessary to minimize the voltage difference between the output voltage and the voltage of the battery pack to reduce the heat dissipation of the charging module 100.
In some embodiments, with continued reference to fig. 3, the first switch Q1, the second switch Q2 and the battery charging switch K are MOS transistors or triodes. Specifically, the types and parameters of the first switch tube Q1, the second switch tube Q2 and the battery charging switch K can be selected according to actual needs, and need not be limited by the embodiments of the present invention.
When the charging module 100 provided in the embodiment of the present invention is in operation, that is, when the battery pack B + is charged, the first switching tube Q1, the second switching tube Q2, the first inductor L1, and the first capacitor C1 form a voltage reduction circuit, an input voltage is reduced and then output, the battery charging switch K operates in a linear impedance region, and the voltage sampling module 120 collects voltages V at two ends of the battery pack B +, and the voltage V is output from the battery pack B +BATAnd the output voltage V of the voltage-reducing circuit 110BUCKThe controller 130 obtains the voltage V of the battery packBATAnd said output voltage VBUCKThen, the voltage V of the battery pack is determinedBATAnd said output voltage VBUCKAnd controls the on/off time of the second switching tube Q2 according to the voltage data to regulate the output voltage VBUCKAnd the requirement of linear charging is met.
Wherein the output voltage of the DC power supply DC is set to VBUSThe switching period of the second switching tube Q2 is T, and the conduction time is TONThe voltage at the input terminal of the battery charging switch K, i.e., the output voltage V of the voltage-reducing circuit 110BUCKIs a VBUCK＝VBUS*TONT, setting the operating efficiency of the voltage-reducing circuit 110 to ηBUCK(generally η)BUCKGreater than 90%), setting the charging current to be I (the charging current of the battery pack with small battery capacity is basically within 200 mA), and then the heat dissipation of the whole machine is as follows: p ═ I ═ VBUCK*(1-ηBUCK)+I*(VBUCK-VBAT)。
Further, taking an electronic device with a small battery capacity as an example, in order to control heat dissipation of the charging module 100, it is necessary to apply the voltage V of the battery pack B +BATAnd the output voltage V of the voltage-reducing circuit 110BUCKPressure difference V betweendropAt present, V is reduced as much as possibledropCan be made to be 0.1V, because of the voltage V of the battery pack B +BATUsually not higher than 4.4V, the output voltage V of the voltage-reducing circuit 110BUCKThe heat dissipation P of the whole machine can be realized under the conditions that the voltage is not higher than 4.6V and the charging current I is less than 200mA<0.2*4.6*0.1W+0.2 × 0.2W ═ 0.092W +0.04W ═ 132 mW. By reducing the voltage V of the battery B +BATAnd the output voltage V of the voltage-reducing circuit 110BUCKPressure difference V betweendropThe method can control the temperature rise of the whole battery to be 5 ℃ during quick charging, and can meet the full-charge requirement of the whole battery by adopting a linear charging framework.
The embodiment of the invention provides a charging module, which is applied to electronic equipment and comprises: the charging module provided by the embodiment of the invention carries out a linear charging mode by adjusting the output of the voltage reducing circuit, the full charge is realized, the charging speed is high, and the heat emission is less.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A charging module applied to an electronic device including a battery pack, the charging module comprising:
the output end of the battery charging switch is used for being connected with the battery pack;
the input end of the voltage reduction circuit is connected with a direct current power supply, and the output end of the voltage reduction circuit is connected with the input end of the battery charging switch;
the voltage sampling module comprises two sampling ports which are respectively connected with the input end and the output end of the battery charging switch, wherein one sampling port is used for collecting the output voltage of the direct-current power supply after passing through the voltage reduction circuit, and the other sampling port is used for collecting the voltage of the battery pack;
the controller comprises a data port connected with the voltage sampling module and a control port connected with the battery charging switch and the control end of the voltage reduction circuit, the controller is configured to open the battery charging switch when the battery pack needs to be charged, and linearly adjust the output voltage according to the collected voltage of the battery pack and the voltage difference between the output voltage and the voltage of the battery pack, so that the direct-current power supply charges the battery pack through the voltage reduction circuit.
2. The charging module of claim 1,
the control end of the battery charging switch is connected with a first control port of the controller, and the controller is configured to control the battery charging switch to be conducted and work in a linear impedance region through the first control port when the battery pack is determined to need to be charged.
3. The charging module of claim 2, wherein the voltage-reduction circuit comprises:
the input end of the first switching tube is used for being connected with the direct-current power supply, and the control end of the first switching tube is connected with the second control port of the controller;
the input end of the second switching tube is connected with the output end of the first switching tube, the control end of the second switching tube is connected with the third control port of the controller, and the output end of the second switching tube is grounded;
the controller is configured to open the first switch tube when the battery pack needs to be charged, and adjust the conduction time of the second switch tube according to the collected voltage of the battery pack and the voltage difference between the output voltage and the voltage of the battery pack, so as to linearly adjust the magnitude of the output voltage.
4. The charging module of claim 3, wherein the voltage-reduction circuit further comprises:
and one end of the first inductor is connected with the output end of the first switch tube and the input end of the second switch tube, and the other end of the first inductor is connected with the input end of the battery charging switch.
5. The charging module of claim 4, wherein the voltage-reduction circuit further comprises:
and one end of the first capacitor is connected with the input end of the battery charging switch and the other end of the first inductor, and the other end of the first capacitor is grounded.
6. Charging module according to any of claims 2-5,
the voltage difference between the output voltage and the voltage of the battery pack is less than or equal to 0.1 volt.
7. The charging module of claim 6,
the first switch tube, the second switch tube and the battery charging switch are MOS tubes or triodes.
8. An electronic device, comprising:
a battery pack, and,
a charging module as claimed in any one of claims 1 to 7, having an input for connection to a DC power supply and an output for connection to the battery pack.
9. The electronic device of claim 8,
the electronic equipment is a wireless Bluetooth headset.
10. The electronic device of claim 8,
the battery pack is a lithium battery pack.
CN202011295727.9A 2020-11-18 2020-11-18 Charging module and electronic equipment Pending CN114552680A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011295727.9A CN114552680A (en) 2020-11-18 2020-11-18 Charging module and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011295727.9A CN114552680A (en) 2020-11-18 2020-11-18 Charging module and electronic equipment

Publications (1)

Publication Number Publication Date
CN114552680A true CN114552680A (en) 2022-05-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011295727.9A Pending CN114552680A (en) 2020-11-18 2020-11-18 Charging module and electronic equipment

Country Status (1)

Country Link
CN (1) CN114552680A (en)

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