CN113078718A - Novel charging circuit and control method thereof - Google Patents
Novel charging circuit and control method thereof Download PDFInfo
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- CN113078718A CN113078718A CN202110511052.5A CN202110511052A CN113078718A CN 113078718 A CN113078718 A CN 113078718A CN 202110511052 A CN202110511052 A CN 202110511052A CN 113078718 A CN113078718 A CN 113078718A
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- 238000007600 charging Methods 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 24
- 238000010280 constant potential charging Methods 0.000 claims description 12
- 230000005611 electricity Effects 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 230000001419 dependent effect Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052744 lithium Inorganic materials 0.000 abstract description 14
- 239000000463 material Substances 0.000 description 12
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 8
- 230000006978 adaptation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003381 stabilizer Substances 0.000 description 3
- 238000009499 grossing Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229920001897 terpolymer Polymers 0.000 description 2
- 239000005955 Ferric phosphate Substances 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229940032958 ferric phosphate Drugs 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with battery
-
- 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
- H02J7/00047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with provisions for charging different types of batteries
-
- 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
-
- 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
- H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
- H02J7/0045—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction concerning the insertion or the connection of the batteries
-
- 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
-
- 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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
- H02J7/04—Regulation of charging current or voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
本发明公开了一种新型充电电路及其控制方法，包括充电装置以及电池组，充电装置与电池组采用电连接，充电装置内设置有整流滤波电路和PWM模块，整流滤波电路连接外部电源，充电装置通过PWM模块与整流滤波电路相互配合为电池组进行充电，充电装置内设置有充电控制模块、检测电路、MCU模块，电池组内设置有电芯组、识别电路，充电控制模块与电芯组电连接，检测电路与识别电路电连接，MCU模块接收检测电路的输入信号并控制充电控制模块的输出。检测电路与识别电路相互配合，起到识别电池组内电芯组种类的作用；MCU模块能够控制充电控制模块转换充电模式，从而使其适配不同种类的锂电池，提高适配性有利于进一步延长锂电池的使用寿命。
The invention discloses a novel charging circuit and a control method thereof, comprising a charging device and a battery pack. The charging device and the battery pack are electrically connected. A rectifying filter circuit and a PWM module are arranged in the charging device. The device charges the battery pack through the cooperation of the PWM module and the rectification filter circuit. The charging device is provided with a charging control module, a detection circuit, and an MCU module. The battery pack is provided with a battery pack, an identification circuit, a charging control module and a battery pack The detection circuit is electrically connected with the identification circuit, and the MCU module receives the input signal of the detection circuit and controls the output of the charging control module. The detection circuit and the identification circuit cooperate with each other to identify the type of cell group in the battery pack; the MCU module can control the charging control module to switch the charging mode, so that it can adapt to different types of lithium batteries, and improving the adaptability is conducive to further Extend the life of lithium batteries.
Description
Technical Field
The invention relates to the field of battery charging, in particular to a novel charging circuit and a control method thereof.
Background
The existing market has a variety of lithium batteries, including lithium manganate batteries, ternary polymer lithium batteries and lithium iron phosphate batteries. The ternary polymer lithium battery and the lithium iron phosphate battery occupy the main position of the lithium battery market, and although the charging and discharging characteristics of various materials are different, the charging of the batteries with different material electric core groups by only using a single charging mode obviously cannot well meet the characteristics of the electric core groups made of different materials. Moreover, the phenomenon of charging error reporting can be found in the actual use process, and the battery can be damaged to a certain extent when the battery is charged by using an incompletely matched charging mode for a long time. Therefore, I have proposed corresponding improvements to the above-mentioned problems existing in the existing lithium battery market.
Disclosure of Invention
The invention provides a novel charging circuit and a control method thereof, aiming at the problem that the battery is damaged when the battery is charged in an incompletely matched charging mode for a long time in the prior art.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the utility model provides a novel charging circuit, includes charging device and group battery, charging device with the group battery adopts the electricity to be connected, be provided with rectification filter circuit and PWM module in the charging device, rectification filter circuit connects external power source, charging device passes through the PWM module with rectification filter circuit mutually supports to do the group battery charges, be provided with charging control module, detection circuitry, MCU module in the charging device, be provided with electric core group, identification circuit in the group battery, charging control module with electric core group electricity is connected, detection circuitry with identification circuit electricity is connected, the MCU module is received detection circuitry's input signal and control charging control module's output.
The rectification filter circuit is matched with the PWM module, so that the charging device has stable input voltage; the detection circuit is matched with the identification circuit to identify the type of the electric core group in the battery pack; the charging control module has the function of converting the charging mode, and the MCU module can control the charging control module to convert the charging mode, so that the charging control module is adaptive to different types of lithium batteries, and the adaptability is improved, thereby being beneficial to further prolonging the service life of the lithium batteries.
Preferably, the novel charging circuit further includes a transformer T1, the transformer T1 is connected to the rectifying and filtering circuit, and the detection circuit and the charging control module are connected in parallel to the transformer T1.
The input voltage after the transformer T1 is further refined for powering the charging control module and the detection circuit.
Preferably, in the novel charging circuit, the transformer T1 is provided with a primary coil P1, a first secondary coil P2 and a second secondary coil P3, the primary coil P1 is electrically connected to the rectifying and filtering circuit, a MOS transistor Q1 is provided between the primary coil P1 and the rectifying and filtering circuit, a G-pole of the MOS transistor Q1 is electrically connected to the PWM module, the first secondary coil P2 is respectively connected to the detection circuit and the charging control module, and the second secondary coil P3 is connected to the PWM module.
The PWM module controls the input of a primary coil P1 through an MOS (metal oxide semiconductor) tube Q1, so that the product has a self-protection function; meanwhile, the output voltages corresponding to different turns of different coils are different, so that the coil can be adapted to different modules, and the effects of saving energy and improving the adaptability are achieved.
Preferably, the detection circuit of the novel charging circuit includes a voltage regulator and a resistor R1, the identification circuit includes a resistor R2, the voltage regulator, the resistor R1 and the resistor R2 are connected in series, and the MCU module is connected to the charging control module and receives an input signal generated by dividing the voltage by the resistor R1 and the resistor R2.
The voltage stabilizer, the resistor R1 and the resistor R2 are mutually matched, wherein the voltage stabilizer plays a role in voltage reduction and stabilization, so that the voltage passing through the voltage stabilizer is reduced to a limit value, and the resistor R2 with the corresponding limit value is arranged in different types of batteries through the resistance value of the limit resistor R1, so that the effects of identifying the types of the batteries, changing the charging mode and prolonging the service life of the batteries are achieved by detecting the corresponding voltage value.
Preferably, the novel charging circuit further comprises a feedback device, and the feedback device is connected with the PWM module and the positive electrode of the battery cell group.
The feedback device feeds back the input voltage on the cell group to the PWM module in real time, and the PWM module is adjusted.
Preferably, in the novel charging circuit, the charging control module includes a constant current control circuit and a voltage control circuit.
A control method of a novel charging circuit comprises the following steps:
s1, the voltage stabilizing device enables the voltage applied to the resistor R1 and the resistor R2 to be maintained at an accurate fixed value, wherein the value is the total voltage of the two ends of the resistor R1 and the resistor R2, namely V (R1) + V (R2);
the total voltage across the resistor R1 and the resistor R2 is limited, so that the values of V (R1) and V (R2) can be obtained through calculation under the condition that the resistance values of the resistor R1 and the resistor R2 are known, and calculation is facilitated.
S2, keeping the resistance value of the resistor R1 as a fixed value, enabling the resistance value of the resistor R2 to be an independent variable, enabling the value of V (R2) to be a dependent variable, enabling an electric signal transmitted to the MCU module to be a value of V (R2), and enabling V (R2) to be R2/(R1+ R2) × (V (R1) + V (R2));
when the resistance value of the resistor R1 is a fixed value and the total voltage is a limited value, the battery pack types corresponding to different V (R2) can be obtained by measuring V (R2) by changing the resistance value of the resistor R2 and arranging the resistors R2 with different resistance values in different battery packs, so that the identification function is achieved.
S3, the MCU module controls the charging control module to charge the cell group by detecting the value of V (R2), if the resistor R2 is N1, V (R2) is V1, and at this time, step S4 is executed; if the resistor R2 is N2, V (R2) is V2, then go to step S5;
under the condition that V (R2) is in different values, the MCU module controls the output of the charging control module to output in different modes, so that the effects of protecting the battery pack and prolonging the service life are achieved.
S4, the charging control module controls the charging mode of the cell pack, and the constant-current (0.25C) charging mode is changed into the constant-voltage charging mode;
this charge mode adaptation and the charge of terpolymer lithium cell make this product can be to the more excellent charge mode of terpolymer lithium cell adaptation, and then the protection battery.
And S5, the charging control module controls the charging mode of the cell pack, namely, the constant-current (0.25C) charging mode is switched to the constant-current (0.1C) charging mode, and then the constant-current (0.1C) charging mode is switched to the constant-voltage charging mode.
This charging mode adaptation and the charging of lithium iron phosphate battery make this product can carry out more excellent charging mode to the lithium iron phosphate battery to the protection battery.
Preferably, in the above-described method for controlling the novel charging circuit, if N1 is 2000 ohms, N2 is 8000 ohms, and V (R1) + V (R2) is 5 volts in step S3, step S4 is executed when V1 is 1 volt, V2 is 2.5 volts, that is, when V1 is 1 volt, and step S5 is executed when V2 is 2.5 volts.
Preferably, in the method for controlling the novel charging circuit, in the step S4, the switching condition from the constant current (0.25C) charging mode to the constant voltage charging mode is that the voltage of the electric core set is greater than or equal to 4.1 × N volts, where N is the number of the electric cores in the electric core set.
Preferably, in the control method of the novel charging circuit, in step S5, the switching condition from the constant current (0.25C) charging mode to the constant current (0.1C) charging mode is that the voltage of the electric core set is greater than or equal to 3.3 × N volts, and the switching condition from the constant current (0.1C) charging mode to the constant voltage charging mode is that the voltage of the electric core set is greater than or equal to 3.55 × N, where N is the number of the electric cores in the electric core set.
Drawings
Fig. 1 is a schematic structural diagram of a charging device and a battery pack according to the present invention after connection.
Detailed Description
The invention will be described in further detail below with reference to the accompanying figure 1 and the detailed description, but they are not intended to limit the invention:
example 1
The utility model provides a novel charging circuit, includes charging device and group battery, charging device with the group battery adopts the electricity to be connected, be provided with rectification filter circuit and PWM module in the charging device, rectification filter circuit connects external power source, charging device passes through the PWM module with rectification filter circuit mutually supports to do the group battery charges, be provided with charging control module, detection circuitry, MCU module in the charging device, be provided with electric core group, identification circuit in the group battery, charging control module with electric core group electricity is connected, detection circuitry with identification circuit electricity is connected, the MCU module is received detection circuitry's input signal and control charging control module's output.
Preferably, the charger further comprises a transformer T1, the transformer T1 is connected with the rectifying and filtering circuit, and the detection circuit and the charging control module are connected in parallel to the transformer T1.
Preferably, the transformer T1 includes a primary coil P1, a first secondary coil P2, and a second secondary coil P3, the primary coil P1 is electrically connected to the rectifying and smoothing circuit, and a MOS transistor Q1 is provided between the primary coil P1 and the rectifying and smoothing circuit, a G-pole of the MOS transistor Q1 is electrically connected to the PWM module, the first secondary coil P2 is connected to the detection circuit and the charging control module, respectively, and the second secondary coil P3 is connected to the PWM module.
Preferably, the detection circuit includes a voltage regulator and a resistor R1, the identification circuit includes a resistor R2, the voltage regulator, the resistor R1 and the resistor R2 are connected in series, and the MCU module is connected to the charging control module and receives an input signal generated by dividing the voltage by the resistor R1 and the resistor R2.
Preferably, the power supply further comprises a feedback device, and the feedback device is connected with the PWM module and the positive electrode of the electric core group.
Preferably, the charging control module comprises a constant current control circuit and a voltage control circuit.
Example 2
A control method of a novel charging circuit comprises the following steps:
s1, the voltage stabilizing device enables the voltage applied to the resistor R1 and the resistor R2 to be maintained at an accurate fixed value, wherein the value is the total voltage of the two ends of the resistor R1 and the resistor R2, namely V (R1) + V (R2);
s2, keeping the resistance value of the resistor R1 as a fixed value, enabling the resistance value of the resistor R2 to be an independent variable, enabling the value of V (R2) to be a dependent variable, enabling an electric signal transmitted to the MCU module to be a value of V (R2), and enabling V (R2) to be R2/(R1+ R2) × (V (R1) + V (R2));
s3, the MCU module controls the charging control module to charge the cell group by detecting the value of V (R2), if the resistor R2 is N1, V (R2) is V1, and at this time, step S4 is executed; if the resistor R2 is N2, V (R2) is V2, then go to step S5;
s4, the charging control module controls the charging mode of the cell pack, and the constant-current (0.25C) charging mode is changed into the constant-voltage charging mode;
and S5, the charging control module controls the charging mode of the cell pack, namely, the constant-current (0.25C) charging mode is switched to the constant-current (0.1C) charging mode, and then the constant-current (0.1C) charging mode is switched to the constant-voltage charging mode.
Preferably, if N1 is 2000 ohms, N2 is 8000 ohms, and V (R1) + V (R2) is 5 volts in step S3, step S4 is executed when V1 is 1 volt, V2 is 2.5 volts, that is, V1 is 1 volt, and step S5 is executed when V2 is 2.5 volts.
Preferably, the switching condition from the constant current (0.25C) charging mode to the constant voltage charging mode in step S4 is that the voltage of the cell group is greater than or equal to 4.1 × N volts, where N is the number of strings of cells in the cell group.
Preferably, in step S5, the switching condition from the constant current (0.25C) charging mode to the constant current (0.1C) charging mode is that the voltage of the electric core set is greater than or equal to 3.3 × N volts, and the switching condition from the constant current (0.1C) charging mode to the constant voltage charging mode is that the voltage of the electric core set is greater than or equal to 3.55 × N, where N is the number of the strings of the electric cores in the electric core set.
The charging mode of the ternary material is constant current (0.25C) to constant voltage, and the charging mode of the lithium iron phosphate material is constant current (0.25C) to constant current (0.1C) to constant voltage; for the voltage at the two ends of the electric core group, the voltage at the two ends of the 24V electric core group and the 48V electric core group are the same, the highest voltage of the 24V electric core group is 29.2V (corresponding to 7 strings of ternary materials and 8 strings of lithium iron phosphate), the highest voltage at the two ends of the 48V electric core group is 54.6V (corresponding to 13 strings of ternary materials and 15 strings of lithium iron phosphate), the highest voltage of the 36V ternary material electric core group is 42V (10 strings), and the highest voltage of the 36V lithium iron phosphate material electric core group is 43.8V (12 strings).
Because the imbalance of the lithium battery using the ferric phosphate material between the electric cores at the tail end of the electric core group is obvious, the pressure difference between the single electric cores is large, the charging is still carried out by a large constant current (0.25C) value, the voltage of the partial single electric cores in the battery pack can rise quickly, the BMS is triggered to enter the protection, the charging error is reported, and therefore the charging tail end is switched to a small constant current value (0.1C) to slowly charge the battery, and the whole group of batteries is fully charged.
And then make this product can satisfy the condition of injecing the mode conversion of charging to the lithium cell of different materials, different electric core quantity, make the selection of mode of charging more reasonable charging to the charging of the lithium cell of different materials, different electric core quantity.
In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.
Claims (10)
1. The utility model provides a novel charging circuit, includes charging device and group battery, charging device with the group battery adopts the electricity to be connected, be provided with rectification filter circuit and PWM module in the charging device, rectification filter circuit connects external power source, charging device passes through the PWM module with rectification filter circuit mutually supports and does the group battery charges its characterized in that: the charging device is internally provided with a charging control module, a detection circuit and an MCU module, the battery pack is internally provided with a battery core group and an identification circuit, the charging control module is electrically connected with the battery core group, the detection circuit is electrically connected with the identification circuit, and the MCU module receives an input signal of the detection circuit and controls the output of the charging control module.
2. The novel charging circuit of claim 1, wherein: the charging control circuit further comprises a transformer T1, the transformer T1 is connected with the rectifying and filtering circuit, and the detection circuit and the charging control module are connected to the transformer T1 in parallel.
3. The novel charging circuit of claim 2, wherein: the transformer T1 is provided with a primary coil P1, a first secondary coil P2 and a second secondary coil P3, the primary coil P1 is electrically connected with the rectifying and filtering circuit, an MOS tube Q1 is arranged between the primary coil P1 and the rectifying and filtering circuit, the G pole of the MOS tube Q1 is electrically connected with the PWM module, the first secondary coil P2 is respectively connected with the detection circuit and the charging control module, and the second secondary coil P3 is connected with the PWM module.
4. The novel charging circuit of claim 3, wherein: the detection circuitry includes voltage regulator, resistance R1, identification circuit includes resistance R2, voltage regulator, resistance R1, resistance R2 are established ties each other, the MCU module with the control module that charges is connected and is received the input signal that produces after resistance R1 and resistance R2 divide the voltage.
5. The novel charging circuit of claim 4, wherein: the feedback device is connected with the PWM module and the positive electrode of the battery pack.
6. The novel charging circuit of claim 5, wherein: the charging control module comprises a constant current control circuit and a voltage control circuit.
7. The control method of the novel charging circuit according to claim 6, characterized by comprising the following steps:
s1, the voltage stabilizing device enables the voltage applied to the resistor R1 and the resistor R2 to be maintained at an accurate fixed value, wherein the value is the total voltage of the two ends of the resistor R1 and the resistor R2, namely V (R1) + V (R2);
s2, keeping the resistance value of the resistor R1 as a fixed value, enabling the resistance value of the resistor R2 to be an independent variable, enabling the value of V (R2) to be a dependent variable, enabling an electric signal transmitted to the MCU module to be a value of V (R2), and enabling V (R2) to be R2/(R1+ R2) × (V (R1) + V (R2));
s3, the MCU module controls the charging control module to charge the cell group by detecting the value of V (R2), if the resistor R2 is N1, V (R2) is V1, and at this time, step S4 is executed; if the resistor R2 is N2, V (R2) is V2, then go to step S5;
s4, the charging control module controls the charging mode of the cell pack, and the constant-current (0.25C) charging mode is changed into the constant-voltage charging mode;
and S5, the charging control module controls the charging mode of the cell pack, namely, the constant-current (0.25C) charging mode is switched to the constant-current (0.1C) charging mode, and then the constant-current (0.1C) charging mode is switched to the constant-voltage charging mode.
8. The control method of the novel charging circuit according to claim 7, wherein: if N1 is 2000 ohms, N2 is 8000 ohms, and V (R1) + V (R2) is 5 volts in step S3, step S4 is executed when V1 is 1 volt, and step S5 is executed when V2 is 2.5 volts, that is, V1 is 1 volt, and V2 is 2.5 volts.
9. The control method of the novel charging circuit according to claim 7, wherein: in the step S4, the switching condition from the constant current (0.25C) charging mode to the constant voltage charging mode is that the voltage of the cell group is greater than or equal to 4.1 × N volts, where N is the number of the cells in the cell group.
10. The control method of the novel charging circuit according to claim 7, wherein: in the step S5, the switching condition from the constant current (0.25C) charging mode to the constant current (0.1C) charging mode is that the voltage of the electric core set is greater than or equal to 3.3 × N volts, and the switching condition from the constant current (0.1C) charging mode to the constant voltage charging mode is that the voltage of the electric core set is greater than or equal to 3.55 × N, where N is the number of the electric cores in the electric core set.
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| CN214755654U (en) * | 2021-05-11 | 2021-11-16 | 金华卓远实业有限公司 | Novel charging circuit |
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| CN109155528A (en) * | 2016-02-05 | 2019-01-04 | Oppo广东移动通信有限公司 | Charging system, charging method and power adapter for terminal |
| CN208890421U (en) * | 2018-09-28 | 2019-05-21 | 深圳和而泰智能控制股份有限公司 | A kind of electric tool |
| CN214755654U (en) * | 2021-05-11 | 2021-11-16 | 金华卓远实业有限公司 | Novel charging circuit |
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