CN210608586U - Battery charging circuit and charging control system - Google Patents
Battery charging circuit and charging control system Download PDFInfo
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- CN210608586U CN210608586U CN201921493795.9U CN201921493795U CN210608586U CN 210608586 U CN210608586 U CN 210608586U CN 201921493795 U CN201921493795 U CN 201921493795U CN 210608586 U CN210608586 U CN 210608586U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application provides a battery charging circuit, battery charging circuit includes control unit, first switch unit, first interface, second interface and charging control chip. The control unit is used for outputting a signal to the first switch unit; the first switch unit is used for switching on or switching off the electric connection between the battery unit and the first interface according to the signal of the control unit; the second interface is electrically connected between the battery unit and the charging control chip; the charging control chip is used for acquiring the charge state of the battery unit in real time and controlling the charging unit to output current to the first interface or the second interface according to the charge state. The application also provides a charging control system. According to the battery charging circuit and the charging control system provided by the embodiment of the application, the charging time of the battery can be shortened to improve the charging efficiency, and the cost can be greatly reduced.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery charging circuit and a charging control system.
Background
At present, the charging current of the battery needs to pass through a resistor and a plurality of switching tubes to charge the battery. The large current of the battery during quick charging can produce great voltage drop after passing through the resistor and the plurality of switching tubes, so that the voltage at the battery end is far less than that at the output end, the charger enters a constant voltage charging mode in advance, and the charging time of the battery is prolonged.
In addition, when the large current for quick charging passes through the components, a large amount of joule heat is generated, so that the temperature of the battery is sharply increased and exceeds the preset temperature, the charging current is reduced at the host end, and the charging time of the battery is prolonged.
The common methods in the prior art are: two or three components are connected in parallel to reduce heat generation or add extra heat dissipation materials to assist heat dissipation. However, the above methods greatly increase the product cost, and the charging efficiency is not good.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide a battery charging circuit and a charging control system, which can shorten the charging time of the battery to improve the charging efficiency of the battery and greatly reduce the cost.
An embodiment of the present application provides a battery charging circuit, which includes: the charging control device comprises a control unit, a first switch unit, a first interface, a second interface and a charging control chip;
the control unit is electrically connected to the first switch unit and is used for outputting signals to the first switch unit;
the first switch unit is electrically connected between a battery unit and the first interface, and is used for switching on or switching off the electrical connection between the battery unit and the first interface according to a signal of the control unit;
the first interface is electrically connected to the charging control chip;
the second interface is electrically connected between the battery unit and the charging control chip;
the charging control chip is electrically connected to the charging unit and the battery unit, and is used for acquiring the charge state of the battery unit in real time and controlling the charging unit to output current to the first interface or the second interface according to the acquired charge state.
In some embodiments of the present application, when the state of charge of the battery unit is less than the first state of charge, the charging control chip controls the charging unit to output a first current to the second interface.
In some embodiments of the present application, when the state of charge of the battery unit is greater than or equal to a first state of charge and less than a second state of charge, the charging control chip controls the charging unit to output a second current to the first interface.
In some embodiments of the present application, a current value of the first current is greater than a current value of the second current.
In some embodiments of the present disclosure, the first switch unit includes a first switch and a second switch, a first end, a second end, and a third end of the first switch are electrically connected to the control unit, a second end of the second switch, and the first interface, respectively, and a first end, a second end, and a third end of the second switch are electrically connected to the control unit, the second end of the first switch, and the battery unit, respectively.
In some embodiments of the present application, the control unit includes a first control chip, the first control chip includes a power pin, a first signal pin, a second signal pin, a first control pin, and a second control pin, the power pin of the first control chip is electrically connected to the battery unit, the first control pin of the first control chip is electrically connected to the first end of the first switch, the second control pin of the first control chip is electrically connected to the first end of the second switch, the first signal pin of the first control chip is electrically connected to the third end of the first switch, and the second signal pin of the first control chip is grounded.
In some embodiments of the present application, the battery charging circuit further includes a second switch unit, the second switch unit includes a third switch and a fourth switch, a first end, a second end, and a third end of the third switch are electrically connected to the control unit, a second end of the fourth switch, and a third end of the second switch, respectively, and a first end, a second end, and a third end of the fourth switch are electrically connected to the control unit, a second end of the third switch, and the battery unit, respectively.
In some embodiments of the present application, the control unit further includes a second control chip, the second control chip includes a power pin, a first signal pin, a second signal pin, a first control pin, and a second control pin, the power pin of the second control chip is electrically connected to the battery unit, the first control pin of the second control chip is electrically connected to the first end of the third switch, the second control pin of the second control chip is electrically connected to the first end of the fourth switch, the first signal pin of the second control chip is electrically connected to the third end of the third switch, and the second signal pin of the second control chip is grounded.
In some embodiments of the present application, the battery charging circuit further includes a second switch unit, the second switch unit includes a third switch and a fourth switch, a first end, a second end, and a third end of the third switch are electrically connected to the control unit, a second end of the fourth switch, and a third end of the second switch, respectively, the third end of the third switch is further electrically connected to the second interface, and the first end, the second end, and the third end of the fourth switch are electrically connected to the control unit, the second end of the third switch, and the battery unit, respectively.
In some embodiments of the present application, the battery charging circuit further includes a second switch unit, the second switch unit includes a third switch and a fourth switch, a first end of the third switch is electrically connected to the control unit, a second end of the third switch is grounded, a third end of the third switch is electrically connected to a first end of the fourth switch, a second end of the fourth switch is electrically connected to the battery unit, and a third end of the fourth switch is electrically connected to the first interface and the second interface.
In some embodiments of the present application, the control unit further includes a second control chip, the second control chip includes a power pin, a signal pin, a first control pin, a second control pin, a third control pin, and a fourth control pin, the power pin of the second control chip is electrically connected to the battery unit, the signal pin of the second control chip is grounded, the first control pin of the second control chip is electrically connected to the first end of the third switch, the second control pin of the second control chip is grounded, and the third control pin and the fourth control pin of the second control chip are both grounded.
In some embodiments of the present application, the first state of charge is 80%.
In some embodiments of the present application, the second state of charge is 100%.
An embodiment of the present application provides a charging control system, which includes a battery unit, a charging unit, and the battery charging circuit as described above. In some embodiments of the present application, the battery cell is a lithium battery.
The battery charging circuit and the charge control system that this application embodiment provided, through the control unit output signal extremely first switch element is in order to switch on or break off the battery cell with electricity between the first interface is connected, still passes through the charge control chip is gathered in real time the state of charge of battery cell, and according to gathering the state of charge control the charge unit output current gives first interface perhaps the second interface. Therefore, the battery charging circuit and the charging control system provided by the embodiment of the application can shorten the charging time of the battery to improve the charging efficiency of the battery, and can also greatly reduce the cost.
Drawings
Fig. 1 is a block diagram of a charge control system according to a preferred embodiment of the present application.
Fig. 2 is a block diagram of the battery charging circuit of fig. 1.
Fig. 3 is a circuit diagram of a first embodiment of the battery charging circuit of fig. 1.
Fig. 4 is a circuit diagram of a second embodiment of the battery charging circuit of fig. 1.
Fig. 5 is a circuit diagram of a third embodiment of the battery charging circuit of fig. 1.
Description of the main elements
First control chip U1
Second control chip U2
First switch Q1
Second switch Q2
Third switch Q3
Fourth switch Q4
Capacitor C1-C6
Resistors R1-R7
The following detailed description will further illustrate the present application in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application.
All other embodiments that can be obtained by a person skilled in the art without inventive step based on the embodiments in this application are within the scope of protection of this application.
Referring to fig. 1, fig. 1 is a block diagram of a charging control system 100 according to a preferred embodiment of the present application. The charge control system 100 includes a battery charging circuit 10, a battery unit 20, and a charging unit 30.
The battery charging circuit 10 is electrically connected between the battery unit 20 and the charging unit 30. The charging unit 30 can charge the battery unit 20 through the battery charging circuit 10. In a preferred embodiment, the battery unit 20 may be a lithium battery pack, and the charging unit 30 may be a power adapter.
Referring to fig. 2, fig. 2 is a block diagram of a preferred embodiment of a battery charging circuit 10 according to the present application. In the present embodiment, the battery charging circuit 10 may include a control unit 11, a first switching unit 12, a first interface 13, a second interface 14, and a charging control chip 15.
Specifically, in the embodiment of the present application, the control unit 11 is electrically connected to the first switch unit 12 and the battery unit 20, and the control unit 11 is configured to output a control signal to the first switch unit 12.
Specifically, when the battery unit 20 is turned on, the control unit 11 receives the voltage provided by the battery unit 20, and the control unit 11 outputs the control signal to the first switch unit 12.
The first switch unit 12 is electrically connected between the battery unit 20 and the first interface 13. The first switch unit 12 is configured to receive the control signal output by the control unit 11, and to turn on or off the electrical connection between the battery unit 20 and the first interface 13 according to the control signal of the control unit.
Specifically, when the first switch unit 12 receives a control signal having a first level (e.g., a high level) output by the control unit 11, the first switch unit 12 turns on the electrical connection between the battery unit 20 and the first interface 13.
When the first switching unit 12 receives the control signal having the second level (e.g., low level) output by the control unit 11, the first switching unit 12 disconnects the electrical connection between the battery unit 20 and the first interface 13.
The first interface 13 is electrically connected to the charging control chip 15, and the second interface 14 is electrically connected between the battery unit 20 and the charging control chip 15. The charging control chip 15 is electrically connected to the charging unit 30 and the battery unit 20.
The charge control chip 15 is configured to collect a state of charge (SOC) of the battery unit 20 in real time. The charging control chip 15 is further configured to control the charging unit 30 to output current to the first interface 13 or the second interface 14 according to the collected state of charge to charge the battery unit 20.
Specifically, when the state of charge of the battery unit 20 is less than the first state of charge, i.e. when the battery unit 20 is low in charge, the battery unit 20 enters the fast charge mode. The charging control chip 15 thus outputs a first current (for example, 8A) of the charging unit 30 to the second interface 14 to charge the battery unit 20. In a preferred embodiment, the first state of charge may be 80%.
When the state of charge of the battery unit 20 is greater than or equal to the first state of charge and less than the second state of charge, that is, the electric quantity of the battery unit 20 is high, a normal charging mode is entered, so that the charging control chip 15 outputs a second current (e.g., 4A) of the charging unit 30 to the first interface 13 to charge the battery unit 20. In a preferred embodiment, the second state of charge may be 100%.
In a preferred embodiment, the first current has a current value greater than that of the second current.
Referring to fig. 3, fig. 3 is a circuit diagram of a battery charging circuit 10 according to a first embodiment of the present disclosure. In the present embodiment, the battery charging circuit 10 may further include a second switching unit 16.
In this embodiment, the first switch unit 12 may include a first switch Q1, a second switch Q2, and a capacitor C2. The second switching unit 16 may include a third switch Q3, a fourth switch Q4, and a capacitor C3.
Specifically, a first end of the first switch Q1 is electrically connected to the control unit 11, a second end of the first switch Q1 is electrically connected to a second end of the second switch Q2, and a third end of the first switch Q1 is electrically connected to the first interface 13. The third terminal of the first switch Q1 is electrically connected to the first terminal P1+ of the first interface 13 through a capacitor C1, and the third terminal of the first switch Q1 is electrically connected to the second terminal P1-of the first interface 13.
A first end of the second switch Q2 is electrically connected to the control unit 11, a second end of the second switch Q2 is electrically connected to the second end of the first switch Q1, and a third end of the second switch Q2 is electrically connected to the third end of the third switch Q3. The third terminal of the second switch Q2 is also electrically connected to the third terminal of the first switch Q1 through the capacitor C2.
A first end of the third switch Q3 is electrically connected to the control unit 11, a second end of the third switch Q3 is electrically connected to a second end of the fourth switch Q4, and a third end of the third switch Q3 is electrically connected to a third end of the second switch Q2.
A first terminal of the fourth switch Q4 is electrically connected to the control unit 11, a second terminal of the fourth switch Q4 is electrically connected to the second terminal of the third switch Q3, and a third terminal of the fourth switch Q4 is electrically connected to the first terminal B-of the battery cell 20 through a resistor R1. The third terminal of the fourth switch Q4 is also electrically connected to the third terminal of the third switch Q3 through the capacitor C3.
In a preferred embodiment, the first switch Q1 and the second switch Q2 are both N-channel fets. The first, second and third terminals of the first switch Q1 and the second switch Q2 correspond to the gate, drain and source of the N-channel fet, respectively.
In a preferred embodiment, the third switch Q3 and the fourth switch Q4 are N-channel fets. The first, second and third terminals of the third switch Q3 and the fourth switch Q4 correspond to the gate, drain and source of the N-channel fet, respectively.
In this embodiment, the control unit 11 may include a first control chip U1, a second control chip U2, four resistors R2-R5, and two capacitors C4-C5.
The first control chip U1 is electrically connected to the first switch Q1 and the second switch Q2, and the first control chip U1 is configured to output a control signal to the first switch Q1 and the second switch Q2.
Specifically, the first control chip U1 may include a power pin VDD1, a first signal pin V1-, a second signal pin VSS1, a first control pin CO1, and a second control pin DO 1.
The power pin VDD1 of the first control chip U1 is electrically connected to the second terminal B + of the battery unit 20 through the resistor R2, the power pin VDD1 of the first control chip U1 is also electrically connected to the ground through the capacitor C4, the first control pin CO1 of the first control chip U1 is electrically connected to the first terminal of the first switch Q1, the second control pin DO1 of the first control chip U1 is electrically connected to the first terminal of the second switch Q2, the first signal pin V1-of the first control chip U1 is electrically connected to the third terminal of the first switch Q1 through the resistor R3, and the second signal pin VSS1 of the first control chip U1 is electrically connected to the ground.
The second control chip U2 is electrically connected to the third switch Q3 and the fourth switch Q4, and the second control chip U2 is configured to output a control signal to the third switch Q3 and the fourth switch Q4.
Specifically, the second control chip U2 may include a power pin VDD2, a first signal pin V2-, a second signal pin VSS2, a first control pin CO2, and a second control pin DO 2.
The power pin VDD2 of the second control chip U2 is electrically connected to the second end B + of the battery unit 20 through the resistor R4, the power pin VDD2 of the second control chip U2 is also electrically connected to the ground through the capacitor C5, the first control pin CO2 of the second control chip U2 is electrically connected to the first end of the third switch Q3, the second control pin DO2 of the second control chip U2 is electrically connected to the first end of the fourth switch Q4, the first signal pin V2-of the second control chip U2 is electrically connected to the third end of the third switch Q3 through the resistor R5, and the second signal pin VSS2 of the second control chip U2 is electrically connected to the ground.
The first end P2+ of the second port 14 is electrically connected to the second end B + of the battery cell 20, and the second end P2-of the second port 14 is electrically connected to the first end B-of the battery cell 20.
When the power pin VDD1 of the first control chip U1 and the power pin VDD2 of the second control chip U2 receive the voltage provided by the battery unit 20, the first control chip U1 starts to operate after being powered on, and then can output a control signal to the first end of the first switch Q1 and the first end of the second switch Q2, and the second control chip U2 starts to operate after being powered on, and then can output a control signal to the first end of the third switch Q3 and the first end of the fourth switch Q4.
Therefore, when the charging control chip 15 detects that the state of charge of the battery unit 20 is lower than 80%, the charging control chip 15 outputs the charging current of 8A of the charging unit 30 to the second interface 14, and charges the battery unit 20 through the second interface 14. When the state of charge of the battery cell 20 is 80%, the charging control chip 15 outputs the charging current of 4A of the charging unit 30 to the first interface 13, and charges the battery cell 20 after passing through the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, and the resistor R1 in sequence.
Referring to fig. 4, fig. 4 is a circuit diagram of a battery charging circuit 10 according to a second embodiment of the present invention.
The battery charging circuit 10 of the present embodiment differs from the battery charging circuit 10 of the first embodiment in that:
in this embodiment, the second terminal P2-of the second interface 14 is electrically connected to a node between the third terminal of the second switch Q2 and the third terminal of the third switch Q3.
In this embodiment, when the charging control chip 15 detects that the state of charge of the battery cell 20 is lower than 80%, the charging control chip 15 outputs the first current of 8A of the charging unit 30 to the second interface 14, and charges the battery cell 20 after passing through the third switch Q3, the fourth switch Q4, and the resistor R1 in sequence. After the state of charge of the battery cell 20 is charged to 80%, the charging control chip 15 outputs the second current of 4A of the charging unit 30 to the first interface 13, and charges the battery cell 20 after sequentially passing through the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, and the resistor R1.
Referring to fig. 5, fig. 5 is a circuit diagram of a third embodiment of the battery charging circuit 10 according to the present application.
The battery charging circuit 10 of the present embodiment differs from the battery charging circuit 10 of the first embodiment in that:
in this embodiment, the second switch unit 16 may include a third switch Q3, a fourth switch Q4, a resistor R6, a resistor R7, and a capacitor C6.
The second control chip U2 includes a power pin VDD2, a signal pin VSS2, a first control pin CO2, a second control pin VC1, a third control pin VC2 and a fourth control pin VC 3.
A power pin VDD2 of the second control chip U2 is electrically connected to the second end B + of the battery cell 20 through the resistor R4, a signal pin VSS2 of the second control chip U2 is grounded, a first control pin CO2 of the second control chip U2 is electrically connected to the third switch Q3, a second control pin VC1 of the second control chip U2 is grounded, and a third control pin VC2 and a fourth control pin VC3 of the second control chip U2 are both grounded.
A first end of the third switch Q3 is electrically connected to the first control pin CO2 of the second control chip U2 through the resistor R5, a first end of the third switch Q3 is grounded through the resistor R6, a first end of the third switch Q3 is also grounded through the capacitor C3, a second end of the third switch Q3 is grounded, and a third end of the third switch Q3 is electrically connected to a first end of the fourth switch Q4.
A second terminal of the fourth switch Q4 is electrically connected to the second terminal B + of the battery cell 20, and a third terminal of the fourth switch Q4 is electrically connected to the first terminal P1+ of the first port 13 and the first terminal P2+ of the second port 14.
In this embodiment, after the second control chip U2 is powered on, the first control pin CO2 of the second control chip U2 outputs a control signal to the second switch unit 16. Under normal conditions the third switch Q3 is non-conductive, and when there is a fault requiring protection, the third switch Q3 is conductive, thereby blowing the fourth switch Q4.
In this embodiment, the third switch Q3 is an N-channel field effect transistor. The first end, the second end and the third end of the third switch Q3 correspond to the gate, the drain and the source of the N-channel fet, respectively. In this embodiment, the fourth switch Q4 is a three-terminal fuse.
The operation principle of the battery charging circuit 10 and the charging control system 100 according to the present invention will be described in detail below by taking the circuit diagram shown in fig. 3 as an example.
When the battery pack is used, the power pin VDD1 of the first control chip U1 and the power pin VDD2 of the second control chip U2 both start to operate after receiving the voltage provided by the battery unit 20, the first control pin CO1 and the second control pin DO1 of the first control chip U1 output high-level control signals to the first switch Q1 and the second switch Q2 to control the first switch Q1 and the second switch Q2 to be turned on, and the first control pin CO2 and the second control pin DO2 of the second control chip U2 output high-level control signals to the third switch Q3 and the fourth switch Q4 to control the third switch Q3 and the fourth switch Q4 to be turned on. At this time, the charging control chip 15 detects the state of charge of the battery cell 20 in real time.
If the charging control chip 15 detects that the state of charge of the battery unit 20 is lower than 80%, i.e., the battery unit 20 needs to be rapidly charged, the charging control chip 15 outputs the first current (e.g., 8A) of the charging unit 30 to the second interface 14, and charges the battery cell 20 through the second interface 14 until after the state of charge of the battery cell 20 reaches 80%, i.e., the battery unit 20 needs to be charged normally, the charging control chip 15 outputs the second current (e.g., 4A) of the charging unit 30 to the first interface 13, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4 and the resistor R1 are sequentially connected, the battery cell 20 is charged until the charging is completed when the state of charge of the battery cell 20 reaches 100%.
Obviously, with the battery charging circuit and the charging control system of the present application, during large current fast charging, the charging current directly charges the battery unit 20 through the second interface 14, and when the large current fast charging makes the battery unit 20 reach a predetermined amount of power, the charging current is switched to a small current, and the battery unit 20 is charged after sequentially passing through the first interface 13, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, and the resistor R1, and the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 can protect the battery core of the battery unit 20 from being overcharged.
In the battery charging circuit and the charging control system provided in the above embodiments, the control unit outputs a signal to the first switch unit to turn on or off the electrical connection between the battery unit and the first interface, and the charging control chip further collects the state of charge of the battery unit in real time and controls the charging unit to output a current to the first interface or the second interface according to the collected state of charge. Since the charging current in the case of charging with a large current does not pass through the resistor R1, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4, no voltage drop occurs, and no joule heat is generated in the electronic component. Therefore, the problem of heating of the battery which is difficult to solve in the industry can be solved, the charging time of large current is prolonged, the charging efficiency is improved, the charging time of the battery is further shortened, and the cost can be greatly reduced by the scheme.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present application and are not used as limitations of the present application, and that three suitable modifications and changes of the above embodiments are within the scope of the present application as claimed.
Claims (15)
1. A battery charging circuit, comprising: the charging control device comprises a control unit, a first switch unit, a first interface, a second interface and a charging control chip;
the control unit is electrically connected to the first switch unit and is used for outputting signals to the first switch unit;
the first switch unit is electrically connected between a battery unit and the first interface, and is used for switching on or switching off the electrical connection between the battery unit and the first interface according to a signal of the control unit;
the first interface is electrically connected to the charging control chip;
the second interface is electrically connected between the battery unit and the charging control chip;
the charging control chip is electrically connected to the charging unit and the battery unit, and is used for acquiring the charge state of the battery unit in real time and controlling the charging unit to output current to the first interface or the second interface according to the charge state.
2. The battery charging circuit of claim 1, wherein the charging control chip controls the charging unit to output a first current to the second interface when the state of charge of the battery unit is less than a first state of charge.
3. The battery charging circuit of claim 2, wherein when the state of charge of the battery cell is greater than or equal to a first state of charge and less than a second state of charge, the charging control chip controls the charging unit to output a second current to the first interface.
4. The battery charging circuit of claim 3, wherein a current value of the first current is greater than a current value of the second current.
5. The battery charging circuit of claim 1, wherein the first switch unit comprises a first switch and a second switch, a first terminal, a second terminal, and a third terminal of the first switch are electrically connected to the control unit, a second terminal of the second switch, and the first interface, respectively, and a first terminal, a second terminal, and a third terminal of the second switch are electrically connected to the control unit, a second terminal of the first switch, and the battery unit, respectively.
6. The battery charging circuit of claim 5, wherein the control unit comprises a first control chip, the first control chip comprises a power pin, a first signal pin, a second signal pin, a first control pin, and a second control pin, the power pin of the first control chip is electrically connected to the battery unit, the first control pin of the first control chip is electrically connected to the first end of the first switch, the second control pin of the first control chip is electrically connected to the first end of the second switch, the first signal pin of the first control chip is electrically connected to the third end of the first switch, and the second signal pin of the first control chip is grounded.
7. The battery charging circuit of claim 6, further comprising a second switch unit, wherein the second switch unit comprises a third switch and a fourth switch, a first terminal, a second terminal, and a third terminal of the third switch are electrically connected to the control unit, a second terminal of the fourth switch, and a third terminal of the second switch, respectively, and a first terminal, a second terminal, and a third terminal of the fourth switch are electrically connected to the control unit, a second terminal of the third switch, and the battery unit, respectively.
8. The battery charging circuit of claim 7, wherein the control unit further comprises a second control chip, the second control chip comprises a power pin, a first signal pin, a second signal pin, a first control pin, and a second control pin, the power pin of the second control chip is electrically connected to the battery unit, the first control pin of the second control chip is electrically connected to the first end of the third switch, the second control pin of the second control chip is electrically connected to the first end of the fourth switch, the first signal pin of the second control chip is electrically connected to the third end of the third switch, and the second signal pin of the second control chip is grounded.
9. The battery charging circuit of claim 6, further comprising a second switch unit, wherein the second switch unit comprises a third switch and a fourth switch, a first end, a second end, and a third end of the third switch are electrically connected to the control unit, a second end of the fourth switch, and a third end of the second switch, respectively, the third end of the third switch is further electrically connected to the second interface, and a first end, a second end, and a third end of the fourth switch are electrically connected to the control unit, the second end of the third switch, and the battery unit, respectively.
10. The battery charging circuit of claim 6, further comprising a second switch unit, wherein the second switch unit comprises a third switch and a fourth switch, a first end of the third switch is electrically connected to the control unit, a second end of the third switch is grounded, a third end of the third switch is electrically connected to a first end of the fourth switch, a second end of the fourth switch is electrically connected to the battery unit, and a third end of the fourth switch is electrically connected to the first interface and the second interface.
11. The battery charging circuit of claim 10, wherein the control unit further comprises a second control chip, the second control chip comprises a power pin, a signal pin, a first control pin, a second control pin, a third control pin, and a fourth control pin, the power pin of the second control chip is electrically connected to the battery unit, the signal pin of the second control chip is grounded, the first control pin of the second control chip is electrically connected to the first end of the third switch, the second control pin of the second control chip is grounded, and the third control pin and the fourth control pin of the second control chip are both grounded.
12. The battery charging circuit of claim 2, wherein said first state of charge is 80%.
13. The battery charging circuit of claim 3, wherein said second state of charge is 100%.
14. A charging control system, characterized in that the charging control system comprises a battery unit, a charging unit and a battery charging circuit according to any one of claims 1-13.
15. The charge control system of claim 14, wherein the battery cell is a lithium battery pack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921493795.9U CN210608586U (en) | 2019-09-05 | 2019-09-05 | Battery charging circuit and charging control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921493795.9U CN210608586U (en) | 2019-09-05 | 2019-09-05 | Battery charging circuit and charging control system |
Publications (1)
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| CN210608586U true CN210608586U (en) | 2020-05-22 |
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| CN201921493795.9U Active CN210608586U (en) | 2019-09-05 | 2019-09-05 | Battery charging circuit and charging control system |
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