CN217956754U - Battery charging circuit - Google Patents

Battery charging circuit Download PDF

Info

Publication number
CN217956754U
CN217956754U CN202222269473.4U CN202222269473U CN217956754U CN 217956754 U CN217956754 U CN 217956754U CN 202222269473 U CN202222269473 U CN 202222269473U CN 217956754 U CN217956754 U CN 217956754U
Authority
CN
China
Prior art keywords
battery
module
current
charging
resistor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202222269473.4U
Other languages
Chinese (zh)
Inventor
朱泽春
徐伟
肖占魁
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.)
Hangzhou Joyoung Household Electrical Appliances Co Ltd
Original Assignee
Hangzhou Joyoung Household Electrical Appliances Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Joyoung Household Electrical Appliances Co Ltd filed Critical Hangzhou Joyoung Household Electrical Appliances Co Ltd
Priority to CN202222269473.4U priority Critical patent/CN217956754U/en
Application granted granted Critical
Publication of CN217956754U publication Critical patent/CN217956754U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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

Landscapes

  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The application discloses a battery charging circuit, which comprises a boosting module, a boosting chip, a current feedback module and a voltage feedback module; the boosting module is connected with the power supply and the battery and is used for charging the battery; the boosting chip is connected with the boosting module and the power supply; the current feedback module is connected with the battery and the boosting chip and is used for feeding back the output current of the boosting module when the battery is charged; the voltage feedback module is connected with the battery and the boosting chip and is used for feeding back the output voltage of the boosting module when the battery is charged; the boost chip is used for controlling the boost module to charge the battery in a first charging mode when the output voltage is greater than or equal to a first charging threshold and the output current reaches a first current value; and when the output voltage is greater than or equal to the second charging threshold value, controlling the boosting module to charge the battery in a second charging mode. The safety of when charging the battery can fully be guaranteed to this application.

Description

Battery charging circuit
Technical Field
The application relates to the technical field of batteries, in particular to a battery charging circuit.
Background
Nowadays, lithium batteries have been increasingly used as energy sources for portable tools or energy storage devices. However, although lithium batteries have excellent energy density, the safety of lithium batteries during charging and discharging causes many troubles in application. Therefore, in order to ensure the use safety of the lithium battery, the lithium battery can be charged in the following three stages:
trickle charge phase: as shown in FIG. 1, during this phase, the charging circuit outputs a constant small current I x The battery voltage rises slowly with the charging process, and in order to maintain constant output current, the charging circuit needs to adjust the output voltage in real time as shown by a dotted line, so that the output voltage rises synchronously with the battery voltage;
and (3) a constant current charging stage: as shown in FIG. 1, the charging circuit outputs a constant large current I at this stage m The battery voltage rises faster along with the charging process, and in order to maintain constant output current, the charging circuit also needs to adjust the output voltage in real time as shown by a dotted line, so that the output voltage rises synchronously along with the battery voltage;
constant voltage charging phase, as shown in FIG. 1, in which charging voltage V is applied out And the voltage of the battery is kept stable, the voltage difference is gradually reduced along with the rise of the charging process, and the charging current is gradually reduced as shown by a solid line until the whole charging process is finished.
In the prior art, an integrated chip for a lithium battery is already available on the market, a charging strategy is integrated in the integrated chip, and the charging stage of the lithium battery is adjusted by detecting output current and output voltage. Therefore, in order to reduce the cost, a common DCDC boost chip is usually used to build a constant voltage circuit, and the lithium battery is charged by the constant voltage circuit in a constant voltage charging manner. However, in this method, when the battery capacity is low, the battery is charged by using a constant voltage method, the charging current is large, the heat generation of the battery core is large, and there are safety hazards such as explosion and fire, and the life loss is fast.
SUMMERY OF THE UTILITY MODEL
An object of this application is to provide a battery charging circuit, its security that can fully guarantee when charging the battery has greatly promoted the life of battery.
The embodiment of the application is realized as follows:
the application provides a battery charging circuit, which comprises a boosting module, a boosting chip, a current feedback module and a voltage feedback module; the boosting module is connected with the power supply and the battery and is used for charging the battery; the current feedback module is connected with the battery and the boosting chip and is used for feeding back the output current of the boosting module when the battery is charged; the voltage feedback module is connected with the battery and the boosting chip and is used for feeding back the output voltage of the boosting module when the battery is charged; the boosting chip is connected with the boosting module and the power supply and used for determining a charging mode of the battery charging circuit to the battery based on the output current and the output voltage; when the output voltage is greater than or equal to a first charging threshold value and the output current reaches a first current value, controlling the boosting module to charge the battery in a first charging mode; when the output voltage is greater than or equal to a second charging threshold value, controlling the boosting module to charge the battery in a second charging mode; the second charging threshold is larger than the first charging threshold, the first charging mode is to output current to the battery with a first current value, and the second charging mode is to output current to the battery with a fixed voltage value.
In one embodiment, the current feedback module includes a first current feedback unit and a second current feedback unit; the first current feedback unit is connected with the battery and the boost chip; the second current feedback unit is connected with the first current feedback unit in parallel; the second current feedback unit is used for disconnecting the first current feedback unit when the output voltage is smaller than the first charging threshold; the boost chip is also used for controlling the boost chip to charge the battery in a third charging mode when the second current feedback unit is disconnected from the first current feedback unit and the output current reaches a second current value; the third charging mode is to output current to the battery with a second current value, and the second current value is smaller than the first current value.
In one embodiment, the battery charging circuit further comprises a control module; the control module is connected with the battery and the second current feedback unit and used for detecting the output voltage of the boosting module when the battery is charged; the control module is further used for controlling the second current feedback unit to be disconnected from the first current feedback unit when the output voltage is smaller than the first charging threshold.
In one embodiment, the second current feedback unit includes a first switching element; the control module is connected with the battery and the first switch element; the control module is further used for controlling the first switch element to be non-conductive when the output voltage is smaller than the first charging threshold value.
In one embodiment, the boost module includes an inductor, a diode, and a second switching element; wherein, the input end of the inductor is connected with a power supply; the anode of the diode is connected with the output end of the inductor, and the cathode of the diode is connected with the anode of the battery; the first end of the second switch element is connected with the output end of the inductor, the second end of the second switch element is connected with the boost chip, and the third end of the second switch element is grounded.
In one embodiment, the voltage feedback module comprises a first resistor and a second resistor; the first end of the first resistor is connected with the positive electrode of the battery, and the second end of the first resistor is connected with the boosting chip; the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is grounded.
In one embodiment, the first current feedback unit includes a third resistor; the second current feedback unit comprises a fourth resistor; the first end of the third resistor is connected with the negative electrode of the battery and the boosting chip, and the second end of the third resistor is grounded; the fourth resistor is connected with the third resistor in parallel; the first end of the first switch element is connected with the second end of the fourth resistor, the second end of the first switch element is connected with the control module, and the third end of the first switch element is grounded.
In one embodiment, the control module includes a fifth resistor, a sixth resistor, a third switching element and a voltage reference chip; the first end of the fifth resistor is connected with the positive electrode of the battery; the first end of the sixth resistor is connected with the second end of the fifth resistor, and the second end of the sixth resistor is grounded; the first end of the third switching element is connected with the positive electrode of the battery, and the third end of the third switching element is connected with the second end of the first switching element and the ground end; the first end of the voltage reference chip is connected with the second end of the third switching element, the second end of the voltage reference chip is connected with the second end of the fifth resistor, and the third end of the voltage reference chip is grounded.
In one embodiment, the boost module and the boost chip are connected with the power supply through the adapter; the battery charging circuit further comprises a power detection module; the power detection module is connected with the adapter and the second current feedback unit and used for detecting the output power of the adapter; the power detection module is also used for controlling the second current feedback unit to be disconnected from the first current feedback unit when the output power of the adapter is detected to be smaller than a preset threshold value; the boost chip is used for controlling the boost module to be switched from the first charging mode to the third charging mode to charge the battery when the second current feedback unit is disconnected from the first current feedback unit.
In one embodiment, the battery charging circuit further comprises a thermistor; the thermistor is connected with the fourth resistor in series, and the thermistor is connected with the third resistor in parallel.
Compared with the prior art, the beneficial effect of this application is: the battery charging circuit can charge the battery in a constant-current charging mode or a constant-voltage charging mode in a self-adaptive manner based on the current voltage condition of the battery; specifically, when the current voltage of the battery is lower, the battery is charged in a constant current charging mode; and when the voltage of the battery voltage reaches a set threshold value, charging the battery by adopting a constant voltage charging mode. This kind of charging method accords with the charging characteristic of lithium cell more, can avoid to a certain extent appearing the incident such as explosion and getting on fire when charging the battery, has fully guaranteed the security when charging the battery, has greatly promoted the life of battery.
In addition, in another embodiment of the present application, the current feedback module is divided into two current feedback units, and a switching element is disposed in one of the current feedback units, so as to change the resistance of the feedback resistor in the battery charging circuit by controlling whether the switching element is turned on. Furthermore, the resistance value of the feedback resistor is changed, so that the battery charging circuit can have a trickle charging mode on the basis of realizing a constant-current charging mode and a constant-voltage charging mode, and the application scene of the battery charging circuit is expanded by the mode. Simultaneously, this kind of circuit structure, the charge mode when charging the battery accords with the charge characteristic of lithium cell more, possesses the superiority, and further assurance when charging the battery has promoted the life of battery.
In addition, in another embodiment of the present application, the boost module and the boost chip are connected to the power supply through an adapter, and the battery charging circuit further includes a power detection module. When the battery charging circuit charges the battery in a constant-current charging mode, the power detection module is used for detecting the output power of the adapter in real time, and when the output power of the adapter is smaller, the battery charging circuit is controlled to be switched from the constant-current charging mode to a trickle charging mode to charge the battery. The adapter is protected by the mode, the adapter is prevented from running in an overload mode, and the battery charging circuit can normally execute the charging operation on the battery.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic diagram illustrating a lithium battery charging process according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a battery charging circuit for implementing a constant-current charging mode and a constant-voltage charging mode according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a battery charging circuit for implementing a trickle charge mode, a constant current charge mode, and a constant voltage charge mode according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a control module according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a battery charging circuit with a battery protection function according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a battery charging circuit with adapter protection according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a battery charging circuit implementing a trickle charge mode, a constant current charge mode, and a constant voltage charge mode according to another embodiment of the present application;
fig. 8 is a schematic structural diagram of a battery charging circuit with an adapter protection function according to another embodiment of the present application.
Reference numerals:
1-a battery charging circuit; 10-a boost module; 20-a boost chip; 30-a voltage feedback module; 40-a current feedback module; 41-a first current feedback unit; 42-a second current feedback unit; 50-an adapter; 60-a battery; 70-a control module; 80-power detection module.
Detailed Description
The terms "first," "second," "third," and the like are used for descriptive purposes only and not for purposes of indicating or implying relative importance, and do not denote any order or order.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.
In the description of the present application, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
The technical solution of the present application will be clearly and completely described below with reference to the accompanying drawings.
Fig. 2 is a schematic structural diagram of a battery charging circuit 1 for implementing a constant current charging mode and a constant voltage charging mode according to an embodiment of the present disclosure. The battery charging circuit 1 in the present application is used for charging the battery 60, and the battery charging circuit 1 in the present application may be used for charging the lithium battery 60.
As shown in fig. 2, the battery charging circuit 1 in the present application includes a boost module 10, a boost chip 20, a current feedback module 40, and a voltage feedback module 30. The boost module 10 is connected to a power supply and the battery 60, and is configured to charge the battery 60. The current feedback module 40 is connected to the battery 60 and the boost chip 20, and is used for feeding back an output current of the boost module 10 when the battery 60 is charged. The voltage feedback module 30 is connected to the battery 60 and the boost chip 20, and is used for feeding back the output voltage V of the boost module 10 when charging the battery 60 out . Wherein the output voltage V out The current voltage condition of the battery 60 can be reflected. The boost chip 20 is connected with the boost module 10 and the power supply, and the boost chip 20 is used for outputting current and voltage V out Determining a charging mode of the battery 60 by the battery charging circuit 1; at an output voltage V out When the output current reaches the first current value and is greater than or equal to the first charging threshold value, the boost module 10 is controlled to charge the battery 60 in the first charging mode; at an output voltage V out When the voltage is greater than or equal to the second charging threshold, the voltage boosting module 10 is controlled to charge the battery 60 in the second charging mode; the second charging threshold is greater than the first charging threshold, and the first charging mode is to output electricity to the battery 60 at the first current valueThe second charging mode is to output a current to the battery 60 at a fixed voltage value.
In an embodiment, the boost chip 20 is a DCDC chip and is provided with a plurality of pins, and the boost module 10, the voltage feedback module 30 and the current feedback module 40 can be connected to the boost chip 20 through the corresponding pins.
The charging principle of the battery 60 by the battery charging circuit 1 in fig. 2 is explained in detail below:
when the battery charging circuit 1 enters a charging state for the battery 60, the boost chip 20 controls the boost module 10 to start boosting with the initial output voltage as a starting point, and charges the battery 60. At the same time, the voltage feedback module 30 will boost the output voltage V of the module 10 out The voltage is scaled down and then fed back to the boost chip 20, and the current feedback module 40 converts the output current of the boost module 10 into a voltage value and feeds the voltage value back to the boost chip 20. Since the boost chip 20 can only collect the voltage value, the current feedback module 40 needs to convert the output current value into the voltage value and feed back the voltage value to the boost chip 20. Further, the boost chip 20 itself has a maximum output current limiting function, and has a characteristic that the priority of the current limiting function is higher than the priority of voltage stabilization. Therefore, the output voltage V of the boost module 10 out Before reaching the stable state, if the boost chip 20 detects that the output current of the boost module 10 reaches the maximum output current I based on the current value fed back by the current feedback module 40 and the voltage value fed back by the voltage feedback module 30 m (first current value), and output voltage V out Is greater than or equal to the first charging threshold value V 1 (exemplary, first charging threshold V 1 Which may be 3V), it controls the boost module 10 to charge the battery 60 in the constant current charging mode (the first charging mode), i.e., controls the boost module 10 to output the maximum output current I m Outputs a current to the battery 60. In this way, the whole battery charging circuit 1 works in the maximum current protection state, so that the battery charging circuit 1 is effectively protected. Wherein the boost chip 20 is set with the maximum output current I m Corresponding feedback threshold V se When the voltage boost module 10 detects that the voltage value fed back by the current feedback module 40 reaches V se While in use, theThe output current of the booster module 10 is considered to reach the maximum output current I m . Meanwhile, when the output current of the boost module 10 reaches the maximum output current I m At this time, the output voltage of the boost module 10 must be equal to or greater than the first charge threshold V 1 。
At the maximum output current I of the boost module 10 m When the battery 60 is charged, the voltage of the battery 60 will rise along with the charging process, and then the output current of the boost module 10 is stabilized at the maximum output current I m The boost chip 20 controls the boost module 10 to boost. When the boost chip 20 detects that the output current of the boost module 10 reaches the maximum output current I m When the output current of the boost module 10 is larger than the maximum output current I, the boost module 10 is controlled to stop boosting, so that the boost module 10 continues to output the maximum output current I m The battery 60 is charged. Further, when the output current of the boost module 10 is detected to be less than the maximum output current I m And when the current time is over, the process is continuously repeated. When the boost module 10 detects the output voltage V of the boost module 10 based on the voltage value fed back by the voltage feedback module 30 as the charging process proceeds out Reach the second charge threshold V 2 Time (V) 2 >V 1 ) It will control the battery charging circuit 1 to leave the maximum current protection state, so that the voltage boosting module 10 charges the battery 60 in the constant voltage charging mode (the second charging mode), i.e. control the voltage boosting module 10 to have a fixed voltage value V 2 Outputs current to the battery 60. This charging process is continued until the entire constant voltage charging phase is completed, completing the charging process for the battery 60. Wherein, the boost chip 20 is set with the maximum voltage feedback threshold V fb When the boost chip 20 detects that the voltage value fed back by the voltage feedback module 30 reaches V fb In time, the output voltage V of the boost module 10 can be considered out Reaches a second charge threshold V 2 。
Therefore, the battery charging circuit 1 in the present application can adaptively charge the battery 60 in a constant current charging mode or a constant voltage charging mode based on the current voltage condition of the battery 60; specifically, when the current voltage of the battery 60 is low, the battery 60 is charged in a constant current charging mode; when the voltage of the battery 60 reaches the set threshold, the battery 60 is charged in the constant voltage charging mode. This kind of charging mode accords with lithium battery 60's charging characteristic more, can avoid appearing the incident such as explosion and getting on fire when charging battery 60 to a certain extent, has fully guaranteed the security when charging battery 60, has greatly promoted battery 60's life.
As shown in fig. 2, in the present embodiment, the BOOST module 10 is a BOOST circuit composed of a diode D 1 Inductor L 1 And a second switching element Q 1 And (4) forming. Wherein, the inductance L 1 The input end of the power supply is connected with a power supply; diode D 1 Is connected with the output end of the inductor, and a diode D 1 Is connected to the positive electrode of the battery 60; second switching element Q 1 Is connected to the output terminal of the inductor, and a second switching element Q 1 Is connected to the boost chip 20, and a second switching element Q 1 The third terminal of the transformer is grounded. Exemplary, second switching element Q 1 Can be MOS transistor, then the second switch element Q 1 The first end of the first switch is the drain electrode of the MOS tube, and the second switch element Q 1 The second terminal of the first switch is a grid electrode of the MOS tube, and the second switch element Q 1 The third end of the MOS tube is a source electrode of the MOS tube. The boost chip 20 may control the second switching element Q 1 Controls the boost module 10 to charge the battery 60 in different charging modes.
As shown in fig. 2, in the present embodiment, the voltage feedback module 30 includes a first resistor R 3 And a second resistor R 4 (ii) a Wherein, the first resistor R 3 Is connected to the positive pole of the battery 60, a first resistor R 3 The second end of the voltage-boosting chip 20 is connected with the voltage-boosting chip; a second resistor R 4 First terminal of (2) and first resistor R 3 Is connected to the second terminal of the first resistor R 4 The second terminal of (a) is grounded. Then at this time, only the first resistor R needs to be adjusted according to the formula (1) 3 And a second resistor R 4 The output voltage V of the boost module 10 in the constant voltage charging mode can be changed by adjusting the resistance value out 。
Figure BDA0003816765540000111
Wherein, V fb For the output voltage V of the boost module 10 set in the boost chip 20 out Reach the second charge threshold V 2 The voltage feedback module 30 correspondingly feeds back the voltage value.
As shown in fig. 2, in the present embodiment, the current feedback module 40 includes a resistor R 5 (ii) a Wherein, the resistance R 5 Is connected to the negative electrode of the battery 60 and the boost chip 20, and the resistor R 5 The second terminal of (a) is grounded. Then at this time, only the resistance R needs to be adjusted according to the formula (2) 5 The maximum output current I of the boost module 10 in the constant current charging mode can be changed by adjusting the resistance value m 。
Figure BDA0003816765540000112
Wherein, V se To set the output current of the boost module 10 in the boost chip 20 to the maximum output current I m The current feedback module 40 correspondingly feeds back the voltage value.
As shown in fig. 2, in this embodiment, the battery charging circuit 1 may further include a filter capacitor C 1 (ii) a Wherein, the filter capacitor C 1 The positive pole of the filter is connected with the input end of the inductor, and the filter capacitor C 1 The negative electrode of (2) is grounded. Filter capacitor C 1 The filter is used for filtering, and the power supply can supply power to the battery charging circuit 1 with stable voltage.
Fig. 3 is a schematic structural diagram of a battery charging circuit 1 that implements a trickle charge mode, a constant current charge mode, and a constant voltage charge mode according to an embodiment of the present application. Please refer to fig. 4, which is a schematic structural diagram of a control module 70 according to an embodiment of the present disclosure. As shown in fig. 3, the present embodiment is different from the embodiment shown in fig. 2 in that the current feedback module 40 includes a first current feedback unit 41 and a second current feedback unit 42; the first current feedback unit 41 is connected to the battery 60 and the boost chip 20; the second current feedback unit 42 is connected to the first current feedback unit 41And (4) connecting. The purpose of this arrangement is to enable the battery charging circuit 1 of the present application to operate in a trickle charge mode with a voltage less than a first predetermined threshold V 1 The battery 60 is charged. Specifically, as shown in fig. 4, a control module 70 is provided in the battery charging circuit 1, and the output voltage of the boosting module 10 is detected by the control module 70. When the control module 70 detects the output voltage V of the boost module 10 out Less than a first charging threshold V 1 It may control the second current feedback unit 42 to disconnect from the first current feedback unit 41, thereby enabling the boost chip 20 to boost the output voltage V of the module 10 out Less than a first charging threshold V 1 At this time, the boosting module 10 is controlled to charge the battery 60 in the trickle charge mode (third charge mode), that is, the boosting module 10 is controlled to trickle charge the current I x (second Current value, I x <I m ) Outputs current to the battery 60.
Specifically, as shown in fig. 4, the control module 70 may be indirectly connected to the battery 60 by being connected to the voltage feedback module 30, and may detect the output voltage V of the voltage boost module 10 based on the connection out . For example, since the voltage feedback module 30 is connected to the 3 rd pin FB of the boost chip 20, the control module 70 may be connected to the voltage feedback module 30 through the third pin FB.
As shown in fig. 3, in this embodiment, the first current feedback unit 41 includes a third resistor R 5 (ii) a The second current feedback unit 42 includes a fourth resistor R 6 (ii) a Wherein the third resistor R 5 Is connected to the negative electrode of the battery 60 and the boost chip 20, and a third resistor R 5 The second terminal of (1) is grounded; a fourth resistor R 6 And a third resistor R 5 Are connected in parallel. Then, at this time, only the third resistor R needs to be applied according to the formula (3) 5 And a fourth resistor R 6 Resistance R of resistors after parallel connection And are combined The output current I of the boost module 10 in the constant current charging mode can be changed by adjusting m 。
Figure BDA0003816765540000131
Wherein, V se To set the output current of the boost module 10 in the boost chip 20 to the maximum output current I m Meanwhile, the current feedback module 40 feeds back the corresponding voltage value.
Meanwhile, only the third resistor R needs to be matched according to the formula (4) 5 By adjusting the resistance value, the output current I of the voltage boosting module 10 in the trickle charge mode can be changed x 。
Figure BDA0003816765540000132
Wherein, V se The output current of the boost module 10 set in the boost chip 20 reaches the trickle charge current I x The current feedback module 40 correspondingly feeds back the voltage value.
It is noteworthy that, because of V se Is a fixed value inherent to the boost chip 20, which cannot be changed, so when the output current of the boost module 10 reaches the trickle charge current I x Or, the output current of the boost module 10 reaches the constant current charging current I m In time, the voltage values fed back by the current feedback module 40 are all V se 。
As shown in fig. 3, in the present embodiment, the second current feedback unit 42 is further provided with a first switching element Q 2 (ii) a Wherein the first switching element Q 2 First terminal and fourth resistor R 6 Is connected to the second terminal of the first switching element Q 2 Is connected to the control module 70, a first switching element Q 2 The third terminal of the switch is grounded. Illustratively, the first switching element Q 2 The first end of the first switching element is a drain electrode of the MOS transistor, the second end of the first switching element is a gate electrode of the MOS transistor, and the third end of the first switching element is a source electrode of the MOS transistor. As shown in FIG. 4, the control module 70 is provided with a plurality of pins, which can pass through the 5 th pin and the first switching element Q 2 Is connected. It can be seen that the control module 70 can detect the output voltage V of the boost module 10 out Is smaller than the first chargeElectric threshold value V 1 By controlling the first switching element Q 2 In a non-conductive manner, the second current feedback unit 42 is disconnected from the first current feedback unit 41.
In one embodiment, a first comparator may be provided in the control module 70. The first comparator is used for comparing the output voltage V of the boost module 10 out And a first charging threshold V 1 Comparing the voltage levels and applying a voltage to the first switching element Q based on the comparison result 2 Outputs a high/low level signal to control the first switching element Q based on the level signal 2 Whether it is on or not. Specifically, the first comparator may be at the output voltage V of the boost module 10 out Is less than a first charging threshold value, to the first switching element Q 2 Transmits a low level signal to thereby enable the first switching element Q 2 The low-level signal can be received and then the signal is turned off. The first comparator may also be at the output voltage V of the boost module 10 out Is greater than or equal to a first charging threshold, and supplies the first switching element Q with the voltage 2 Transmits a high level signal to thereby enable the first switching element Q 2 The high-level signal can be turned on after being received.
The charging principle of the battery 60 by the battery charging circuit 1 in fig. 3 is explained in detail below:
before the boost chip 20 controls the boost module 10 to charge the battery 60, the control module 70 determines the output voltage V of the boost module 10 based on the voltage value fed back by the voltage feedback module 30 out Less than a first charging threshold V 1 While it is going to the first switching element Q 2 Transmits a low level signal to thereby enable the first switching element Q 2 The low level signal is received and then the signal is turned off. Wherein when the first switching element Q 2 When the current feedback module 40 is turned to the non-conducting state, the second current feedback unit 42 is disconnected from the first current feedback unit 41, and only the first current feedback unit 41 of the whole current feedback module 40 operates. After the second current feedback unit 42 is disconnected from the first current feedback unit 41, if the boost chip 20 detects the boost moduleThe output current of 10 reaches the trickle charge current I x (second current value), it will control the voltage boosting module 10 to charge the battery 60 in the trickle charge mode, i.e. the trickle charge current I x Outputs a current to the battery 60. Similarly, in the trickle charge mode, the output current of the boosting module 10 is maintained at the trickle charge current I as in the constant current charge mode described in the embodiment of fig. 2 x When detecting that the output current of the boost module 10 is small, the boost chip 20 also controls the boost module 10 to boost the voltage, and repeats the process. When the boost module 10 charges the battery 60 in the trickle charge mode, the charging current output by the boost module 10 passes through only the third resistor R 5 The feedback resistance is large, allowing a small current to pass.
As charging progresses, the control module 70 determines the output voltage V of the boost module 10 based on the voltage detection module feedback voltage value out Is greater than or equal to the first charging threshold value V 1 While it is going to the first switching element Q 2 Transmits a high level signal to make the first switching element Q 2 The high-level signal can be turned on after being received. Wherein when the first switching element Q 2 When the current feedback module 40 is turned to the on state, the second current feedback unit 42 is connected to the first current feedback unit 41 again, and the first current feedback unit 41 and the second current feedback unit 42 operate simultaneously in the whole current feedback module 40. After the second current feedback unit 42 is connected to the first current feedback unit 41 again, if the boost chip 20 detects that the output current of the boost module 10 reaches the maximum output current I m It may control the boost module 10 to charge the battery 60 in a constant current charging mode, i.e. with the maximum output current I m Outputs a current to the battery 60. When the boost module 10 charges the battery 60 in the constant current charging mode, the charging current output by the boost module 10 passes through the third resistor R simultaneously 5 And a fourth resistor R 6 The feedback resistance is small, and the allowed current is large; the specific charging process of the constant current charging mode is detailed in corresponding explanation part in fig. 2, and is not described herein again.
When the constant-current charging mode is finished, the boost chip 20 can control the boost module 10 to charge the battery 60 in the constant-voltage charging mode; the specific charging process in the constant voltage charging mode is detailed in corresponding explanation part in fig. 2, and is not described herein again. At the end of the constant voltage charging mode, the charging process for the battery 60 is completed.
It can be seen that, in this embodiment, the current feedback module 40 is divided into two current feedback units, and a switching element is disposed in one of the current feedback units, so as to change the resistance value of the feedback resistor in the battery charging circuit 1 by controlling whether the switching element is turned on. Furthermore, the resistance value of the feedback resistor is changed, so that the battery charging circuit 1 can have a trickle charging mode on the basis of realizing a constant-current charging mode and a constant-voltage charging mode, and the application scene of the battery charging circuit 1 is expanded by the mode. Meanwhile, compared with fig. 2, the charging circuit 1 for a battery shown in this embodiment has a charging mode better conforming to the charging characteristics of the lithium battery 60 when the battery 60 is charged, has advantages, further ensures the safety when the battery 60 is charged, and prolongs the service life of the battery 60.
Fig. 5 is a schematic structural diagram of a battery charging circuit 1 with a battery 60 protection function according to an embodiment of the present disclosure. As shown in fig. 5, the difference from the battery charging circuit 1 in fig. 3 is that, in the present embodiment, the battery charging circuit 1 further includes a thermistor PTC; specifically, the thermistor PTC is located in the second current feedback unit 42, and the thermistor PTC and the fourth resistor R 6 In series with a third resistor R 5 Are connected in parallel. In the constant-current charging mode, when the cell temperature of the battery 60 rises, the resistance of the thermistor PTC becomes large, and the charging current allowed by the battery charging circuit 1 becomes small, thereby effectively preventing the cell from being ignited and exploded due to the excessive charging current and the excessive temperature.
Through the above measures, the thermistor is disposed in the second current feedback unit 42, so that a phenomenon of fire and explosion of the battery cell of the battery 60 due to an excessive charging current in the constant-current charging mode is fully avoided, and the battery cell of the battery 60 is effectively protected.
In an embodiment, the boost module 10 and the boost chip 20 may be connected to the power supply through the USB adapter 50, and the output voltage of the USB adapter 50 may be adjusted according to the number of the rechargeable batteries 60. Illustratively, when the number of the rechargeable batteries 60 is changed from one to two, the output voltage of the USB adapter 50 may be raised from 5V to 8.4V.
It should be noted that, when the boost module 10 charges the battery 60 in the constant current charging mode, the charging power is larger, and if the output power of the adapter 50 is smaller, the adapter 50 may be overloaded and damaged seriously, so that the boost module 10 stops charging the battery 60. To avoid this, the battery charging circuit 1 of the present application may also have the function of protecting the adapter 50.
Fig. 6 is a schematic structural diagram of a battery charging circuit 1 with an adapter 50 protection function according to an embodiment of the present application. As shown in fig. 6, the present embodiment is different from the battery charging circuit 1 illustrated in fig. 3 in that. In this embodiment, the battery charging circuit 1 further includes a power detection module 80. The power detection module 80 is connected to the adapter 50 and the second current feedback unit 42, and configured to detect the output power of the adapter 50, and control the second current feedback unit 42 to disconnect from the first current feedback unit 41 when the output power of the adapter 50 is detected to be smaller than a preset threshold. Further, the boost chip 20 is enabled to control the boost module 10 to switch from the constant-current charging mode to the trickle charging mode to charge the battery 60 when the second current feedback unit 42 is disconnected from the first current feedback unit 41.
As shown in fig. 6, the power detection module 80 in the present embodiment may be indirectly connected to the second current feedback unit 42 by being connected to the control module 70. For example, as shown in fig. 4, the control module 70 is provided with a plurality of pins, and the power detection module 80 may be connected to the control module 70 through the 8 th pin.
As shown in fig. 6, in the present embodiment, the power detection module 80 includes a resistor R 13 Resistance, and a method for manufacturing the same R1 And a capacitor C 3 . Wherein, the resistance R 13 Is connected to the adapter 50, a resistorR 13 To the control module 70; resistance R 12 First terminal and resistor R 13 Is connected to the second terminal of (2), a resistor R 12 The second terminal of (1) is grounded; capacitor C 3 First terminal and resistor R 13 Is connected to the second terminal of the capacitor C 3 The second terminal of (a) is grounded. The power detection module 80 is used for detecting the output power of the adapter 50 and sending the detection result of the output power of the adapter 50 to the control module 70 in the form of a sampling signal. If the control module 70 determines that the output power of the adapter 50 is less than the predetermined threshold P based on the sampling signal sent by the power detection module 80 1 Then, the first switching element Q can be turned on 2 Transmitting a low level signal to make the first switching element Q 2 And switching from a conducting state to a non-conducting state. Further, the second current feedback unit 42 is caused to disconnect from the first current feedback unit 41.
In one embodiment, a second comparator is provided in the control module 70. The second comparator is used for comparing the sampling signal output by the power detection module 80 with the preset threshold value P of the adapter 50 1 Comparing and determining whether the current output power of the adapter 50 is less than a preset threshold value P based on the comparison result 1 . Specifically, upon determining that the output power of the adapter 50 is less than the preset threshold value P 1 While the first comparator may supply the first switching element Q 2 Transmitting a low level signal to make the first switching element Q 2 After receiving the low level signal, the second current feedback unit 42 is switched from the on state to the off state, so as to disconnect the first current feedback unit 41 from the second current feedback unit 42.
The principle of the battery charging circuit 1 in fig. 6 for protecting the adapter 50 is explained in detail below:
the power detection module 80 detects the output power of the adaptor 50 in real time while the boosting module 10 charges the battery 60 in the constant current charging mode, and transmits a sampling signal to the control module 70 based on the detection result. When the control module 70 determines that the output power of the adapter 50 is less than the preset threshold value P based on the sampling signal 1 Then, the first switching element Q can be turned on 2 Transmitting a low level signal to turn on the first switching element Q 2 And switching from a conducting state to a non-conducting state. When the first switching element Q 2 When the charging mode is changed to the non-conducting state, the second current feedback unit 42 is disconnected from the first current feedback unit 41, and the boost chip 20 controls the boost module 10 to switch from the constant-current charging mode to the trickle charging mode to charge the battery 60. Continuing the charging process, when the boost chip 20 determines the output voltage V of the boost module 10 based on the voltage value fed back by the voltage feedback module 30 out Is greater than or equal to the second charging threshold value V 2 And then, the boosting module 10 is controlled to charge the battery 60 in the constant voltage charging mode until the whole charging process is finished.
Therefore, in the present embodiment, the power detection module 80 is arranged, so that when the battery charging circuit 1 charges the battery 60 in the constant current charging mode, the power detection module 80 can detect the output power of the adapter 50 in real time, and when the output power of the adapter 50 is small, the battery charging circuit 1 is controlled to be switched from the constant current charging mode to the trickle charging mode to charge the battery 60. This way, the adapter 50 can be effectively protected, the adapter 50 is prevented from being overloaded, and the battery charging circuit 1 can normally perform the charging operation for the battery 60.
Fig. 7 is a schematic structural diagram of a battery charging circuit 1 that implements a trickle charge mode, a constant current charge mode, and a constant voltage charge mode according to another embodiment of the present application. As shown in fig. 7, the difference from the battery charging circuit 1 in fig. 3 and 4 is. The control module 70 in the present embodiment is directly connected to the battery 60, and the control module 70 in the present embodiment includes a fifth resistor R 8 A sixth resistor R 9 And a third switching element Q 3 And a voltage reference chip U 3 (ii) a Wherein the fifth resistor R 8 Is connected to the positive electrode of the battery 60; a sixth resistor R 9 First terminal and fifth resistor R 8 Is connected to the sixth resistor R 9 The second terminal of (1) is grounded; third switching element Q 3 Is connected to the positive electrode of the battery 60, and the third switching element Q 3 And the third terminal of the first switching element Q 2 The second end of the second switch is connected with the ground end; voltage reference chip U 3 First end and second end ofThree-switch element Q 3 Is connected to a voltage reference chip U 3 Second terminal and fifth resistor R 8 Is connected to a voltage reference chip U 3 The third terminal of the switch is grounded. Illustratively, the third switching element Q 3 Can be a triode; then the third switching element Q is at this time 3 The first end of the first switch element is a collector of a triode, and a third switch element Q 3 The second terminal of the first switch is a base electrode of a triode, and a third switch element Q 3 The third end of the triode is an emitter of the triode.
The charging principle of the battery 60 by the battery charging circuit 1 in fig. 6 is explained in detail below:
when the voltage of the battery 60 is less than the first charging threshold V 1 I.e. the output voltage V of the boost module 10 out Less than a first charging threshold V 1 Then through a fifth resistor R 8 And a sixth resistor R 9 After voltage division, the voltage reference chip U can not be reached 3 Turn-on voltage of, voltage reference chip U 3 And is not conductive. Further, a voltage reference chip U 3 Is not conducted so that the third switching element Q 3 And a first switching element Q 2 And also not conductive, the second current feedback unit 42 is disconnected from the first current feedback unit 41. Further, after the second current feedback unit 42 is disconnected from the first current feedback unit 41, if the boost chip 20 detects that the output current of the boost module 10 reaches the trickle charge current I x Then the boost module 10 may be controlled to charge the battery 60 in the trickle charge mode. When the voltage of the battery 60 is equal to or greater than the first charging threshold V as the charging process proceeds 1 I.e. the output voltage V of the boost module 10 out Is greater than or equal to a first charging threshold V 1 Then through a fifth resistor R 8 And a sixth resistor R 9 After voltage division, a voltage reference chip U is reached 3 Turn-on voltage of (2), voltage reference chip U 3 And conducting. Further, a voltage reference chip U 3 Is turned on so that the third switching element Q 3 And a first switching element Q 2 Also conductive, the second current feedback unit 42 is re-connected with the first current feedback unit 41. Further, at the second electricityAfter the current feedback unit 42 is connected to the first current feedback unit 41, if the boost chip 20 detects that the output current of the boost module 10 reaches the maximum output current I m Then, the boosting module 10 can be controlled to charge the battery 60 in the constant current charging mode. When the boost chip 20 detects the output voltage V of the boost module 10 as the charging process proceeds out Reaches a second charge threshold V 2 At this time, the boosting module 10 is controlled to charge the battery 60 in the constant voltage charging mode. This charging process is continued until the entire constant voltage charging phase is completed, completing the charging process for the battery 60.
Fig. 8 is a schematic structural diagram of a battery charging circuit 1 with an adapter 50 protection function according to another embodiment of the present application. As shown in fig. 8, the present embodiment is different from the battery charging circuit 1 shown in fig. 6 in that the power detection module 80 is directly connected to the adapter 50 and the second current feedback unit 42 in the present embodiment. Meanwhile, the power detection module 80 in the present embodiment includes a resistor R 10 And a resistor R 11 Voltage reference chip U 4 And a resistor R 12 Triode Q 4 Triode Q 5 And a capacitor C 4 (ii) a Wherein, the resistance R 10 Is connected to the adapter 50; resistance R 11 First terminal of (2) and resistor R 10 Is connected to the second terminal of resistor R 11 The second terminal of (1) is grounded; voltage reference chip U 4 First terminal and resistor R 10 Is connected to a voltage reference chip U 4 The second terminal of (a) is grounded; resistance R 12 Is connected to the adapter 50; triode Q 4 Emitter and resistor R of 12 Is connected to the second terminal of the triode Q 4 Base and voltage reference chip U 4 Is connected to the third terminal of the triode Q 4 Collector of (2) and first switching element Q 2 Is connected with the grid electrode SW; triode Q 5 Collector and triode Q 4 Is connected to the collector of a triode Q 5 Base and voltage reference chip U 4 Is connected to the third terminal of the transistor Q 5 The emitter of (2) is grounded; capacitor C 4 First terminal of and triode Q 4 Is connected to the collector of a capacitor C 4 The second terminal of (a) is grounded. Then at this point the power detection module 80 may control the first switching element Q directly based on the current output power condition of the adapter 50 2 Whether it is on or off, and based on the first switching element Q 2 And whether to be on or off controls whether the second current feedback unit 42 is disconnected from the first current feedback unit 41.
The principle of the battery charging circuit 1 in fig. 8 for protecting the adapter 50 is explained in detail below:
when the boost module 10 charges the battery 60 in the constant current charging mode, if the output power of the adapter 50 is less than the predetermined threshold P 1 Through resistance R 10 And a resistance R 11 After voltage division, the voltage reference chip U can not be reached 4 Turn-on voltage of, voltage reference chip U 4 And is not conductive. Further, a voltage reference chip U 4 Is not conducted, so that the triode Q 4 Non-conducting triode Q 5 Is turned on, which results in the first switching element Q 2 Is pulled low, the first switching element Q 2 The on state is switched to the off state, the second current feedback unit 42 is disconnected from the first current feedback unit 41, and the boost chip 20 controls the boost module 10 to switch from the constant current charging mode to the trickle charging mode to charge the battery 60. Continuing the charging process, when the boost chip 20 determines the output voltage V of the boost module 10 based on the voltage fed back by the voltage feedback module 30 out Is greater than or equal to a second charging threshold V 2 And then, the boost module 10 is controlled to charge the battery 60 in the constant voltage charging mode until the whole charging process is finished.
In one embodiment, as shown in fig. 8, the control module 70 of this embodiment may be provided with a resistor R 13 . When the voltage boosting module 10 is switched from the constant current charging mode to the trickle charging mode and the battery 60 is charged in the trickle charging mode, the output power of the adapter 50 gradually increases back, which causes the output power to pass through the fifth resistor R 10 And a sixth resistor R 11 After voltage division, a first voltage reference chip U is reached 4 On voltage of, the first voltage reference chip U 4 And conducting. Further, when the voltage reference chip U4 is turned on, the resistor R 13 And electricityResistance R 12 While to the capacitor C 4 And charging is carried out. When the charging voltage reaches the first switching element Q 2 At the on-voltage of, the first switching element Q 2 When the second current feedback unit 42 is connected to the first current feedback unit 41 again, the boost chip 20 controls the boost module 10 to switch from the trickle charge mode to the constant-current charge mode to charge the battery 60, and meanwhile, when the boost module 10 charges the battery 60 in the constant-current charge mode, the power detection module 80 also continuously detects the output power of the adapter 50 to protect the adapter 50 in real time.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A battery charging circuit, comprising:
the boosting module is connected with a power supply and a battery and used for charging the battery;
the boosting chip is connected with the boosting module and the power supply;
the current feedback module is connected with the battery and the boosting chip and used for feeding back the output current of the boosting module when the battery is charged;
the voltage feedback module is connected with the battery and the boost chip and used for feeding back the output voltage of the boost module when the battery is charged;
the boost chip is used for determining a charging mode of the battery charging circuit to the battery based on the output current and the output voltage; when the output voltage is greater than or equal to a first charging threshold value and the output current reaches a first current value, controlling the boosting module to charge the battery in a first charging mode; when the output voltage is greater than or equal to a second charging threshold value, controlling the boosting module to charge the battery in a second charging mode; the second charging threshold is greater than the first charging threshold, the first charging mode is to output current to the battery at the first current value, and the second charging mode is to output current to the battery at a fixed voltage value.
2. The battery charging circuit of claim 1, wherein the current feedback module comprises:
the first current feedback unit is connected with the battery and the boosting chip;
the second current feedback unit is connected with the first current feedback unit in parallel and used for disconnecting the first current feedback unit when the output voltage is smaller than the first charging threshold;
the boost chip is further used for controlling the boost chip to charge the battery in a third charging mode when the second current feedback unit is disconnected from the first current feedback unit and the output current reaches a second current value;
the third charging mode is to output current to the battery at the second current value, and the second current value is smaller than the first current value.
3. The battery charging circuit of claim 2, further comprising:
the control module is connected with the battery and the second current feedback unit and used for detecting the output voltage of the boosting module when the battery is charged;
the control module is further configured to control the second current feedback unit to disconnect from the first current feedback unit when the output voltage is smaller than the first charging threshold.
4. The battery charging circuit of claim 3, wherein the second current feedback unit comprises a first switching element;
wherein the control module is connected with the battery and the first switch element;
the control module is further configured to control the first switch element to be turned off when the output voltage is smaller than the first charging threshold.
5. The battery charging circuit of claim 1, wherein the boost module comprises:
the input end of the inductor is connected with the power supply;
the anode of the diode is connected with the output end of the inductor, and the cathode of the diode is connected with the anode of the battery;
and the first end of the second switch element is connected with the output end of the inductor, the second end of the second switch element is connected with the boosting chip, and the third end of the second switch element is grounded.
6. The battery charging circuit of claim 1, wherein the voltage feedback module comprises:
the first end of the first resistor is connected with the anode of the battery, and the second end of the first resistor is connected with the boosting chip;
and the first end of the second resistor is connected with the second end of the first resistor, and the second end of the second resistor is grounded.
7. The battery charging circuit of claim 4, wherein the first current feedback unit comprises:
the first end of the third resistor is connected with the negative electrode of the battery and the boosting chip, and the second end of the third resistor is grounded;
the second current feedback unit includes:
a fourth resistor connected in parallel with the third resistor;
the first end of the first switching element is connected with the second end of the fourth resistor, the second end of the first switching element is connected with the control module, and the third end of the first switching element is grounded.
8. The battery charging circuit of claim 7, wherein the control module comprises:
a first end of the fifth resistor is connected with the positive electrode of the battery;
a first end of the sixth resistor is connected with a second end of the fifth resistor, and the second end of the sixth resistor is grounded;
a third switching element, a first end of which is connected with the anode of the battery, and a third end of which is connected with the second end of the first switching element and the ground end;
and a first end of the voltage reference chip is connected with a second end of the third switching element, a second end of the voltage reference chip is connected with a second end of the fifth resistor, and a third end of the voltage reference chip is grounded.
9. The battery charging circuit of claim 2, wherein the boost module and the boost chip are connected to a power supply via an adapter;
the battery charging circuit further comprises:
the power detection module is connected with the adapter and the second current feedback unit and used for detecting the output power of the adapter;
the power detection module is further used for controlling the second current feedback unit to disconnect the first current feedback unit when the output power of the adapter is detected to be smaller than a preset threshold value;
the boost chip is used for controlling the boost module to be switched from the first charging mode to the third charging mode to charge the battery when the second current feedback unit is disconnected from the first current feedback unit.
10. The battery charging circuit of claim 7, further comprising:
and the thermistor is connected with the fourth resistor in series and is connected with the third resistor in parallel.
CN202222269473.4U 2022-08-26 2022-08-26 Battery charging circuit Active CN217956754U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202222269473.4U CN217956754U (en) 2022-08-26 2022-08-26 Battery charging circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202222269473.4U CN217956754U (en) 2022-08-26 2022-08-26 Battery charging circuit

Publications (1)

Publication Number Publication Date
CN217956754U true CN217956754U (en) 2022-12-02

Family

ID=84210956

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202222269473.4U Active CN217956754U (en) 2022-08-26 2022-08-26 Battery charging circuit

Country Status (1)

Country Link
CN (1) CN217956754U (en)

Similar Documents

Publication Publication Date Title
US10707691B2 (en) Electronic device and charging method thereof
EP3051622B1 (en) Universal rechargeable battery constituted by employing lithium-ion battery and control method
US10554067B2 (en) Power adapter, electronic equipment, battery charging system and method
EP2195902B1 (en) Circuit arrangement with multiple batteries
US11949272B2 (en) Power supply circuit of terminal device, terminal device, and power supply method
US7863865B2 (en) Systems and methods for pulse charging a battery
US20060068242A1 (en) Electric power source apparatus using fuel cell and method of controlling the same
US20050112420A1 (en) Power supply device
JP2005518773A (en) Hybrid power supply
US20050088138A1 (en) Power circuit
CN112994105A (en) Photovoltaic power generation system, power control device and energy storage system
CN211018337U (en) Charging control device and mobile terminal
US20240266846A1 (en) Control circuit, circuit board assembly, and battery parallel system
US6653814B1 (en) Method for determining power supply compatibility in a portable device
CN211480963U (en) Charging control system for preventing battery from being overcharged
CN217956754U (en) Battery charging circuit
US8493023B2 (en) Charge apparatus and method using the same
US10903676B2 (en) Semiconductor device
CN210137196U (en) Charging circuit and charger
CN217956755U (en) Battery charging circuit capable of protecting low-power adapter
CN113119760A (en) Charging and discharging device and control method
CN220914981U (en) Charging circuit, power supply device and vehicle of nickel-hydrogen battery pack
CN217769525U (en) Novel mobile energy storage standby power supply battery management system
CN215528640U (en) Charging circuit
CN220797825U (en) Multi-port quick-filling device

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant