CN115882568A - Charge pump charging circuit, battery pack and electric device - Google Patents
Charge pump charging circuit, battery pack and electric device Download PDFInfo
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- CN115882568A CN115882568A CN202310052682.XA CN202310052682A CN115882568A CN 115882568 A CN115882568 A CN 115882568A CN 202310052682 A CN202310052682 A CN 202310052682A CN 115882568 A CN115882568 A CN 115882568A
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Abstract
The application provides a charge pump charging circuit, battery pack and power consumption device, this charge pump charging circuit includes: a charge pump control module; one end of the charging branch is connected to the power supply, the second end of the charging branch is connected to the charge pump control module, the third end of the charging branch is grounded, the fourth end of the charging branch is connected to the output end, and the output end of the charging branch is connected to the battery; the charge pump control module is further connected to the battery to obtain the voltage and the current of the battery, and outputs a control signal to the charging branch circuit according to the obtained voltage and the obtained current of the battery to control the charging branch circuit to charge the battery, so that the use of a power tube in the charge pump charging circuit is reduced, the chip area occupied by the charge pump charging circuit is reduced, and on the other hand, the charging mode can be conveniently adjusted, so that the charging efficiency of the battery can be improved.
Description
Technical Field
The application relates to the technical field of battery charging, in particular to a charge pump charging circuit, a battery pack and an electric device.
Background
As the power consumption of various portable electronic devices increases, the capacity of batteries provided in the electronic devices also increases, and the demand for charging efficiency also increases. At present, a step-down charge pump technology is gradually applied to a fast charge technology for charging a mobile phone, wherein a charge pump is a non-inductive DC-DC converter, a capacitor is used as an energy storage element for voltage conversion, voltage can be halved while current is doubled, loss caused by routing and switching is actually only included in the whole circuit, and internal resistance of a power Metal-Oxide-Semiconductor Field-Effect Transistor (MOS) is basically in a milliohm level, so that the conversion efficiency is very high and can reach about 97%, which is far higher than 90% of that of a common charging IC. In order to reduce the loss caused by the switch, a large number of low-impedance MOS transistors are usually used to control the charging voltage and current of the battery, but such a design occupies a large chip area.
Disclosure of Invention
In view of the above, embodiments of the present disclosure provide a charge pump charging circuit, a battery assembly and an electrical device to solve the above problems.
The embodiment of the application provides a charge pump charging circuit, and charge pump charging circuit includes: a charge pump control module; at least one charging branch, the one end of charging branch is connected with power supply through being connected to the input, and the second end of charging branch is connected to charge pump control module, and the third end ground of charging branch, the fourth end of charging branch are connected to the output, and the output is connected to the battery. The charge pump control module is also connected to the battery to acquire the voltage and the current of the battery, and the charge pump control module outputs a control signal to the charging branch circuit according to the acquired voltage and current of the battery to control the charging branch circuit to charge the battery. Therefore, the charge pump control module acquires the charging state of the battery by acquiring the current and the voltage of the battery and according to the current and the voltage of the battery, and sends a control signal to the charging branch circuit according to the charging state of the battery so as to control the charging branch circuit to charge the battery.
Furthermore, the charging branch comprises a flying capacitor, and a first switch, a second switch, a third switch and a fourth switch which are sequentially connected between the input end and the ground in series. The first end of the first switch is connected to the input end, the second end of the first switch is connected to the charge pump control module, and the third end of the first switch is connected to the first end of the second switch; the third end of the second switch is connected to the first end of the third switch, the third end of the third switch is connected to the first end of the fourth switch, the third end of the fourth switch is connected to the ground, the second end of the second switch, the second end of the third switch and the second end of the fourth switch are all connected to the charge pump control module, and the output end of the second switch is connected between the third end of the second switch and the first end of the third switch. The first end of the flying capacitor is connected between the third end of the first switch and the first end of the second switch, the second end of the flying capacitor is connected between the third end of the third switch and the first end of the fourth switch, and the charge pump control module controls the first switch, the second switch, the third switch and the fourth switch to be switched on or switched off so as to charge the battery through the flying capacitor. Therefore, the first switch, the second switch, the third switch, the fourth switch and the flying capacitor are arranged in the charging branch circuit to charge the battery, and the current and the voltage output to the battery are adjusted.
Furthermore, when the first switch and the third switch are turned on and the second switch and the fourth switch are turned off, the flying capacitor receives the voltage through the input end to be charged. When the first switch and the third switch are turned off and the second switch and the fourth switch are turned on, the flying capacitor discharges to the battery through the output end to charge the battery. Therefore, the charge and discharge control of the flying capacitor is realized by the time sequence control of each switch in the charging branch circuit.
Furthermore, the charge pump control module comprises a control unit, a voltage sampling unit and a first comparison unit, wherein the input end of the voltage sampling unit is connected to the two ends of the battery, the output end of the voltage sampling unit is connected to the input end of the first comparison unit, and the output end of the first comparison unit is connected to the control unit. The voltage sampling unit is used for acquiring the voltage of the battery and outputting the voltage to the first comparison unit. The first comparison unit is used for comparing the voltage of the battery with a first reference voltage. The control unit is used for outputting a first control signal to the first switch according to the comparison result of the first comparison unit so as to adjust the internal resistance of the first switch, thereby adjusting the voltage of the charging branch circuit and enabling the battery to enter a constant voltage charging mode. Therefore, the voltage sampling unit is used for acquiring the voltage of the battery and outputting the voltage to the first comparing unit and the control unit, the control unit controls the first comparing unit to output a first control signal to the first switch based on the comparison result between the voltage of the battery and the first reference voltage, and the first switch adjusts the internal resistance according to the first control signal, so that the charging branch enters the constant-voltage charging mode.
Further, the voltage sampling unit comprises a first comparator, the first comparison unit comprises a second comparator, a first input end of the first comparator is connected to the positive pole of the battery, a second input end of the first comparator is connected to the negative pole of the battery, and an output end of the first comparator is connected to a first input end of the second comparator. The second input end of the second comparator is used for receiving a second reference voltage, and the output end of the second comparator is connected to the control unit. Therefore, the input end of the voltage sampling unit is connected to the battery to sample the voltage of the battery, and the output end of the voltage sampling unit is connected to the first comparison unit to transmit the sampled voltage of the battery to the first comparison unit.
Furthermore, the charge pump control module further comprises a current sampling unit and a second comparison unit, wherein the input end of the current sampling unit is connected to two ends of a current sampling assembly connected with the battery in series, the output end of the current sampling unit is connected to the input end of the second comparison unit, and the output end of the second comparison unit is connected to the control unit. The current sampling unit is used for acquiring voltages at two ends of the current sampling assembly and outputting the voltages to the second comparison unit. The second comparison unit is used for comparing the voltage at two ends of the sampling component with a second reference voltage. When the control unit confirms that the voltage at the two ends of the current sampling assembly is smaller than the second reference voltage through the second comparison unit, the control unit outputs a second control signal to the first switch to adjust the internal resistance of the first switch, so that the charging current of the charging branch circuit is adjusted, and the battery enters a constant current charging mode. Therefore, the current sampling assembly is connected with the battery in series to sample the current of the battery, the current sampling unit is connected with the current sampling assembly to obtain the current sampled by the current sampling assembly and output the current of the battery to the second comparison unit and the control unit, when the control unit confirms that the current sampled by the sampling assembly is smaller than the reference current through the second comparison unit, the control unit outputs a second control signal to the first switch through the second comparison unit, and the first switch adjusts the internal resistance according to the second control signal to enable the charging branch circuit to enter a constant-current charging mode.
Further, when the control unit confirms that the voltage of the battery is greater than or equal to the first reference voltage through the first comparison unit, the control unit outputs a third control signal to the first switch to control the first switch to be turned off to stop charging. Therefore, the control unit confirms that the voltage of the battery is greater than or equal to the reference voltage through the first comparison unit to confirm whether the battery reaches the preset charging amount, and when the battery reaches the preset charging amount, the control unit controls the first comparison unit to output a third control signal to the first switch, and the first switch is turned off according to the third control signal to stop charging.
Further, the current sampling unit comprises a third comparator, the second comparison unit comprises a fourth comparator, a first input end of the third comparator is connected to the first end of the current sampling component, and a second input end of the third comparator is connected to the second end of the current sampling component; the output end of the third comparator is connected to the first input end of the fourth comparator. The second input end of the fourth comparator is used for receiving the second reference voltage, and the output end of the fourth comparator is connected to the control unit. Therefore, the input end of the current sampling unit is connected to the current sampling assembly to obtain the current of the battery sampled by the current sampling assembly, and the output end of the current sampling unit is connected to the second comparison unit to transmit the current of the battery to the second comparison unit.
The application also provides a battery assembly, which comprises a battery and a charge pump charging circuit, wherein the charge pump charging circuit is connected with the battery and used for receiving the input voltage to charge the battery. Therefore, the charge pump charging circuit in the battery assembly is connected with the battery, and the battery is charged through the charge pump charging circuit.
The application also provides an electric device, and electric device includes load and battery pack, and battery pack is connected with the load to supply power for the load. Therefore, the battery assembly in the electric device is connected with the load and supplies power to the load.
The charge pump charging circuit that this application provided through charge pump control module lug connection to the branch road that charges for but charge pump control module direct control branch road that charges for the battery charges, and charge pump control module still can the direct adjustment charge the voltage or the electric current of branch road, in order to adjust the mode of charging. Therefore, the charge pump charging circuit provided by the application reduces the use of a power tube, reduces the chip area occupied by the charge pump charging circuit, and can conveniently adjust the charging mode on the other hand, thereby improving the charging efficiency of the battery.
Drawings
Fig. 1 is a circuit block diagram of a charge pump charging circuit according to an embodiment of the present application;
fig. 2 is a circuit diagram of a charge pump charging circuit according to an embodiment of the present application;
fig. 3 is a waveform diagram of voltage and current of a flying capacitor in a charge pump charging circuit according to an embodiment of the present application;
FIG. 4 is another waveform diagram of the voltage and current of the flying capacitor in the charge pump charging circuit according to the embodiment of the present application;
fig. 5 is another circuit diagram of a charge pump charging circuit according to an embodiment of the present application;
FIG. 6 is a structural view of a battery pack according to an embodiment of the present invention;
fig. 7 is a structural diagram of an electric device according to an embodiment of the present application.
Description of the main elements
Charge pump charging circuit 100
Charging branch 10
Flying capacitor CFLY
First switch Q1
Second switch Q2
Third switch Q3
Fourth switch Q4
Charge pump control module 20
First comparator CMP1
Second comparator CMP2
Current sampling resistor Rsns
Third comparator CMP3
Fourth comparator CMP4
First charging branch 11
First flying capacitor CFLY1
Second charging branch 12
Fifth switch Q5
Sixth switch Q6
Seventh switch Q7
Eighth switch Q8
Second flying capacitor CFLY2
Power supply VCC
Input terminal VBUS
Output terminal VOUT
Battery BAT
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 obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The terms "first" and "second", etc. in the description of the present application and the above-described drawings are used for distinguishing different objects, not for describing a particular order. Furthermore, the term "comprises" and any variations thereof is intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, article, or apparatus.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments and features of the embodiments described below can be combined with each other without conflict.
As the power consumption of various portable electronic devices increases, the capacity of batteries provided in the electronic devices also increases, and the demand for charging efficiency also increases. At present, a step-down charge pump technology is gradually applied to a fast charge technology for charging a mobile phone, wherein a charge pump is a non-inductive DC-DC converter, a capacitor is used as an energy storage element for voltage conversion, voltage can be halved while current is doubled, loss caused by routing and switching is actually only included in the whole circuit, and internal resistance of a power Metal-Oxide-Semiconductor Field-Effect Transistor (MOS) is basically in a milliohm level, so that the conversion efficiency is very high and can reach about 97%, which is far higher than 90% of that of a common charging IC. In order to reduce the loss caused by the switch, a large number of low-impedance MOS transistors are usually used to control the charging voltage and current of the battery, but such a design occupies a large chip area. Therefore, the present disclosure provides a charge pump charging circuit to solve the above problem.
Referring to fig. 1, a circuit block diagram of a charge pump charging circuit 100 according to an embodiment of the present disclosure is shown. The charge pump charging circuit 100 includes at least one charging branch 10 and a charge pump control module 20.
The first end of the charging branch 10 is connected to the input end VBUS, the second end of the charging branch 10 is connected to the charge pump control module 20, the third end of the charging branch 10 is grounded, and the fourth end of the charging branch 10 is connected to the output end VOUT. The input terminal VBUS is used for receiving a voltage input by the power supply. The output terminal VOUT is connected to the battery BAT.
The charge pump control module 20 is also connected to the battery BAT to obtain the voltage and current of the battery BAT. The charge pump control module 20 outputs a corresponding control signal to the charging branch 10 according to the acquired voltage and current of the battery BAT, so as to control the charging branch 10 to charge the battery BAT.
Further, the charge pump control module 20 is also used for adjusting the voltage or current of the charging branch 10 to adjust the charging mode. In some embodiments, the charging modes of the charging branch 10 include, but are not limited to, a constant current charging mode and a constant voltage charging mode.
In some embodiments, input VBUS is also connected to charge pump control module 20. In this way, the charge pump control module 20 can be powered on when the input end VBUS is connected to the power supply VCC, so as to complete the above-mentioned charging control process. In some embodiments, the input end VBUS may also be powered up by other power supplies, which is not limited in this application.
It can be understood that the charge pump charging circuit 100 provided in the embodiment of the present application is directly connected to the charging branch 10 through the charge pump control module 20, so that the charge pump control module 20 can directly control the charging branch 10 to charge the battery BAT, and the charge pump control module 20 can also directly adjust the voltage or the current of the charging branch 10 to adjust the charging mode. For example, the charge pump control module 20 may output a control signal to the charging branch 10 according to the acquired current of the battery BAT, so that the charging current output by the charging branch 10 to the battery BAT is kept unchanged within a preset time, and the battery BAT enters a constant current charging mode; for another example, the charge pump control module 20 may output a control signal to the charging branch circuit 10 according to the acquired voltage of the battery BAT, so that the charging voltage output by the charging branch circuit 10 to the battery BAT is kept unchanged for another preset time, thereby enabling the battery BAT to enter a constant voltage charging mode.
Therefore, the charge pump charging circuit 100 according to the embodiment of the present application, on the one hand, can reduce the usage of the power transistor and the chip area occupied by the charge pump charging circuit 100, and on the other hand, can conveniently adjust the charging mode, compared to the design that the existing charge pump is connected to the charging branch through the power transistor, so as to improve the charging efficiency of the battery BAT.
Referring to fig. 2, in some embodiments, the charging branch 10 includes a flying capacitor CFLY, and a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4 sequentially connected in series between the input terminal VBUS and the ground.
Specifically, a first terminal of the first switch Q1 is connected to the input terminal VBUS, a second terminal of the first switch Q1 is connected to the charge pump control module 20, and a third terminal of the first switch Q1 is connected to a first terminal of the second switch Q2. The third terminal of the second switch Q2 is connected to the first terminal of the third switch Q3. The third terminal of the third switch Q3 is connected to the first terminal of the fourth switch Q4, and the third terminal of the fourth switch Q4 is grounded. The second terminal of the second switch Q2, the second terminal of the third switch Q3, and the second terminal of the fourth switch Q4 are all connected to the charge pump control module 20. It can be understood that the charging branch 10 obtains the electric energy output by the power supply VCC through the input terminal VBUS. In some embodiments, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 may be low-power Metal-Oxide-Semiconductor Field-Effect transistors (MOS). First ends of the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 are drains of MOS tubes, second ends are grids of the MOS tubes, and third ends are sources of the MOS tubes.
In some embodiments, the first switch Q1, the third switch Q3 and the fourth switch Q4 are N-channel MOS transistors. The connection state of the substrate of the second switch Q2 is adjustable. Specifically, when the voltage of the first terminal of the second switch Q2 is less than the voltage of the third terminal of the second switch Q2, the substrate of the second switch Q2 is connected to the first terminal of the second switch Q2. When the voltage of the third terminal of the second switch Q2 is less than the voltage of the first terminal of the second switch Q2, the substrate of the second switch Q2 is connected to the third terminal of the second switch Q2. In some embodiments, when the second switch Q2 and the fourth switch Q4 are turned on and the flying capacitor CFLY is charged through the output terminal VOUT, the voltage of the first terminal of the second switch Q2 is lower than the voltage of the third terminal of the second switch Q2, so that the substrate of the second switch Q2 is connected to the first terminal of the second switch Q2 to prevent the current of the output terminal VOUT from flowing backward through the second switch Q2.
One end of the output terminal VOUT is connected between the third end of the second switch Q2 and the first end of the third switch Q3, and the second end of the output terminal VOUT is connected to the positive electrode of the battery BAT. The negative electrode of the battery BAT is grounded. It is understood that the charging branch circuit 10 outputs power to the battery BAT through the output terminal VOUT to charge the battery BAT.
A first terminal of the flying capacitor CFLY is connected between the third terminal of the first switch Q1 and the first terminal of the second switch Q2, and a second terminal of the flying capacitor CFLY is connected between the third terminal of the third switch Q3 and the first terminal of the fourth switch Q4.
Thus, in the embodiment of the present application, when the charge pump control module 20 controls the first switch Q1 to be turned on, the charging branch 10 may obtain electric energy through the input end VBUS to charge the battery BAT; when the charge pump 30 controls the first switch Q1 to be turned off, the charging branch 10 may stop receiving power, and thus stop charging the battery BAT.
Further, the charging branch 10 also realizes a step-down charging (for example, halving the output voltage and doubling the output current) of the battery BAT through the flying capacitor CFLY, so as to improve the charging efficiency of the battery BAT. Specifically, in the embodiment of the present application, the charge pump control module 20 controls the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 in the charging branch 10 to turn on and off, so as to implement buck charging. When the charge pump control module 20 controls the first switch Q1 and the third switch Q3 to be turned on and the second switch Q2 and the fourth switch Q4 to be turned off, the flying capacitor CFLY is in a charging state, and the flying capacitor CFLY receives a voltage through the input terminal VBUS for charging. When the charge pump control module 20 controls the second switch Q2 and the fourth switch Q4 to be turned on and the first switch Q1 and the third switch Q3 to be turned off, the flying capacitor CFLY is in a discharging state. And the flying capacitor CFLY is discharged to the battery BAT through the output terminal VOUT to charge the battery BAT. It is to be understood that, in other embodiments, the timing control of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 by the charge pump control module 20 is not limited to the above-mentioned timing control logic, and those skilled in the art can make corresponding adjustments to the specific timing control logic according to actual needs. In other embodiments, the charging branch 10 may also be another dc-dc conversion circuit, and the application does not limit the specific circuit structure of the charging branch 10.
In the embodiment of the present application, the charge pump control module 20 includes a voltage sampling unit 21, a first comparing unit 22, and a control unit 25. The input terminal of the voltage sampling unit 21 is connected to two terminals of the battery BAT, and is configured to sample voltages at the two terminals of the battery BAT. The output terminal of the voltage sampling unit 21 is connected to the input terminals of the control unit 25 and the first comparing unit 22. The output of the first comparing unit 22 is connected to the control unit. The voltage sampling unit 21 is configured to obtain a voltage of the battery BAT and output the voltage to the first comparing unit 22. The first comparing unit 22 is configured to compare the voltage of the battery BAT with a first reference voltage. The control unit 25 is configured to output a first control signal to the first switch Q1 according to the comparison result of the first comparing unit 22, so as to adjust the internal resistance of the first switch Q1, and thereby adjust the voltage of the charging branch 10, so that the battery BAT enters the constant voltage charging mode.
In some embodiments, the voltage sampling unit 21 may include a first comparator CMP1. Specifically, the first input terminal of the first comparator CMP1 is connected to the positive electrode of the battery BAT to sample the voltage of the positive electrode of the battery BAT. A second input terminal of the first comparator CMP1 is connected to the cathode of the battery BAT to sample the cathode voltage of the battery BAT. The first comparator CMP1 then obtains the voltage of the battery BAT from the positive electrode voltage and the negative electrode voltage of the battery BAT. An output terminal of the first comparator CMP1 is connected to the first comparing unit 22 for transmitting the voltage of the battery BAT to the first comparing unit 22.
The first comparison unit 22 includes a second comparator CMP2. Specifically, a first input terminal of the second comparator CMP2 is connected to an output terminal of the first comparator CMP1 to receive the voltage of the battery BAT. The second input terminal of the second comparator CMP2 is for receiving a first reference voltage. The output of the second comparator CMP2 is connected to the control unit 25. In this way, the control unit 25 outputs the first control signal to the first switch Q1 according to the comparison result between the voltage of the battery BAT and the first reference voltage to adjust the internal resistance of the first switch Q1, so as to adjust the voltage output by the charging branch 10 to the battery BAT through the output terminal VOUT, so that the battery BAT enters the constant voltage charging mode.
In some embodiments, the control unit 25 is further configured to send timing signals to the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 to control the first switch Q1, the second switch Q2, the third switch Q3 and the fourth switch Q4 to be turned on and off. The timing signals received by the first switch Q1 and the third switch Q3 are opposite to the timing signals received by the second switch Q2 and the fourth switch Q4. Specifically, when the control unit 25 controls the first switch Q1 and the third switch Q3 to be turned on, the second switch Q2 and the fourth switch Q4 are turned off, the flying capacitor CFLY is in a charging state, and the flying capacitor CFLY receives a voltage through the input terminal VBUS for charging. When the control unit 25 controls the second switch Q2 and the fourth switch Q4 to be turned on, the first switch Q1 and the third switch Q3 are turned off, and the flying capacitor CFLY is in a discharging state. And the flying capacitor CFLY is discharged to the battery BAT through the output terminal VOUT to charge the battery BAT.
In some embodiments, the control unit 25 may control the turning on and off of the first switch Q1 by sending a modulation signal to the first switch Q1 to adjust the internal resistance of the first switch Q1. The modulation signal sent by the control unit 25 to the first switch Q1 may be an analog signal.
Fig. 3 is a waveform diagram of the voltage and current of the flying capacitor CFLY when the battery BAT enters the constant voltage charging mode according to the embodiment of the present application. As can be seen from the figure, when the battery BAT enters the constant voltage charging mode, the charge pump control module 20 adjusts the internal resistance of the first switch Q1 according to the voltage of the battery BAT, so as to realize accurate control of the charging voltage at two ends of the flying capacitor CFLY, thereby realizing constant voltage charging of the battery BAT.
In the embodiment of the present application, the charge pump control module 20 further includes a current sampling unit 23 and a second comparing unit 24. Specifically, the input terminal of the current sampling unit 23 is connected to both ends of the current sampling element 231 connected in series with the battery BAT, the output terminal of the current sampling unit 23 is connected to the input terminal of the second comparing unit 24, and the output terminal of the second comparing unit 24 is connected to the control unit 25. Further, the current sampling unit 23 acquires the voltage across the current sampling component 231, and outputs the acquired voltage across the current sampling component 231 to the second comparing unit 24. The second comparing unit 24 receives the voltage across the current sampling component 231 and compares the voltage across the current sampling component 231 with a second reference voltage. When the control unit 25 determines that the voltage across the current sampling component 231 is smaller than the second reference voltage through the second comparing unit 24, the control unit 25 outputs a second control signal to the first switch Q1 to adjust the internal resistance of the first switch Q1, so as to adjust the charging current of the charging branch 10, and thus the battery BAT enters the constant current charging mode.
In some embodiments, the current sampling unit 23 includes a third comparator CMP3. Specifically, a first input terminal of the third comparator CMP3 is connected to a first terminal of the current sampling element 231 connected in series with the battery BAT, and a second input terminal of the third comparator CMP3 is connected to a second terminal of the current sampling element 231. In some embodiments, the current sampling component 231 may include a current sampling resistor Rsns. And a first terminal of the current sampling element 231 is connected to the negative electrode of the battery BAT, and a second terminal of the current sampling element 231 is grounded. That is, in the embodiment of the present application, the current of the battery BAT is represented by the voltage across the current sampling element 231. The output terminal of the third comparator CMP3 is connected to the second comparing unit 24, so as to transmit the acquired voltage across the current sampling component 231 to the second comparing unit 24.
The second comparing unit 24 includes a fourth comparator CMP4. Specifically, a first input terminal of the fourth comparator CMP4 is connected to an output terminal of the third comparator CMP3 to receive the voltage across the current sampling component 231 output by the third comparator CMP3. The second input terminal of the fourth comparator CMP4 is inputted with the second reference voltage. The output terminal of the fourth comparator CMP4 is connected to the control unit 25, so as to output a second control signal to the first switch Q1 according to the comparison result between the current at the two ends of the current sampling component 231 and the second reference voltage, so as to adjust the internal resistance of the first switch Q1, thereby adjusting the current output by the charging branch circuit 10 to the battery BAT through the output terminal VOUT, so as to enable the battery BAT to enter a constant current charging mode.
Fig. 4 is a waveform diagram of voltage and current of flying capacitor CFLY when battery BAT enters into the constant current charging mode according to the embodiment of the present application. As can be seen from the figure, when the battery BAT enters the constant current charging mode, the charge pump control module 20 adjusts the internal resistance of the first switch Q1 according to the current of the battery BAT, so as to realize accurate control of the charging current at the two ends of the flying capacitor CFLY, thereby realizing constant current charging of the battery BAT.
In some embodiments, the control unit 25 is further configured to confirm whether the voltage of the battery BAT is greater than the first reference voltage through the first comparison unit 22, thereby confirming whether the battery BAT reaches a preset charge amount. When the control unit 25 determines that the voltage of the battery BAT is greater than the first reference voltage, it determines that the battery BAT reaches the preset charging amount, and then controls the first comparing unit 22 to output a third control signal to the first switch Q1, so as to adjust the internal resistance of the first switch Q1, so that the first switch Q1 is turned off, and the battery BAT is stopped being charged.
It is understood that, in some embodiments, the control unit 25 is further connected to the voltage sampling unit 21 and the current sampling unit 23 to determine the current and the voltage of the battery BAT, so as to determine whether to enter the constant current charging mode or the constant voltage charging mode. It is understood that, during the charging process of the battery BAT, the charge pump control module 20 may control the charging branch 10 to charge the battery BAT in a single charging mode (e.g. a constant voltage charging mode or a constant current charging mode); or the charge pump control module 20 may control the charging branch 10 to alternately charge the battery BAT in the constant current charging mode and the constant voltage charging mode, which is not limited in this application.
It can be understood that the present application does not limit the magnitude of the first reference voltage and the second reference voltage, and the values of the first reference voltage and the second reference voltage can be adjusted according to the actual battery BAT or the condition of the charging branch circuit 10.
In the charge pump charging circuit 100 provided by the present application, the charge pump control module 20 determines the charging state of the battery BAT by obtaining the current and the voltage of the battery BAT, and then outputs a control signal to the first switch Q1 according to the charging state of the battery BAT to adjust the internal resistance of the first switch Q1, so as to adjust the current or the voltage output to the battery BAT by the charging branch 10, and adjust the charging mode of the battery BAT. And the first switch Q1 is further configured to receive a timing signal sent by the charge pump control module 20, so as to be turned on and off according to the timing signal, thereby adjusting the charging and discharging states of the flying capacitor CFLY. Therefore, the charge pump charging circuit 100 provided by the present application improves the utilization rate of the switches in the charging branch 10, and reduces the number of the switches in the charge pump charging circuit 100, thereby reducing the chip area, saving the production cost, simplifying the control logic of the charge pump control module 20, and improving the charging efficiency of the charge pump charging circuit 100 for the battery BAT.
In some embodiments, the charge pump charging circuit 100 may include a plurality of charging branches 10 connected in parallel for outputting a larger charging current to the battery BAT according to actual demand. Referring to fig. 5, in some embodiments, the charge pump charging circuit 100 includes two charging branches 10, for example, a first charging branch 11 and a second charging branch 12. Specifically, the first charging branch 11 and the second charging branch 12 are connected in parallel between the input terminal VBUS and ground.
The first charging branch 11 includes a first switch Q1, a second switch Q2, a third switch Q3, a fourth switch Q4, and a first flying capacitor CFLY1. Specifically, a first terminal of the first switch Q1 is connected to the voltage input terminal VBUS, a second terminal of the first switch Q1 is connected to the charge pump 30, and a third terminal of the first switch Q1 is connected to a first terminal of the second switch Q2. The third terminal of the second switch Q2 is connected to the first terminal of the third switch Q3. The third terminal of the third switch Q3 is connected to the first terminal of the fourth switch Q4, and the third terminal of the fourth switch Q4 is grounded. In some embodiments, the charging branch 10 draws power through the voltage input VBUS. One end of the voltage output terminal VOUT is connected between the third end of the second switch Q2 and the first end of the third switch Q3, and the second end of the voltage output terminal VOUT is connected to the positive electrode of the battery BAT. In some embodiments, the first charging branch 11 outputs power to the battery BAT through the voltage output terminal VOUT to charge the battery BAT.
A first terminal of the first flying capacitor CFLY1 is connected between the third terminal of the first switch Q1 and the first terminal of the second switch Q2, and a second terminal of the first flying capacitor CFLY1 is connected between the third terminal of the third switch Q3 and the first terminal of the fourth switch Q4. Specifically, the first charging branch 11 charges the battery BAT by charging the first flying capacitor CFLY1. Specifically, when the first switch Q1 and the third switch Q3 are turned on and the second switch Q2 and the fourth switch Q4 are turned off, the first flying capacitor CFLY1 is in a charging state. When the second switch Q2 and the fourth switch Q4 are turned on and the first switch Q1 and the third switch Q3 are turned off, the first flying capacitor CFLY1 is in a discharging state. In some embodiments, the first flying capacitor CFLY1 is discharged to the battery BAT through the voltage output terminal VOUT to charge the battery BAT.
In some embodiments, the first switch Q1, the third switch Q3 and the fourth switch Q4 are N-channel MOS transistors. A first parasitic diode is arranged on the source electrode of the second switch Q2, a second parasitic diode is arranged on the drain electrode of the second switch Q2, the anode of the first parasitic diode is connected with the anode of the second parasitic diode, and the substrate of the second switch Q2 is connected between the anode of the first parasitic diode and the anode of the second parasitic diode, so that when the second switch Q2 and the fourth switch Q4 are switched on, and the flying capacitor CFLY is charged through the output terminal VOUT, the current of the output terminal VOUT is prevented from flowing backwards through the second switch Q2.
The second charging branch 12 includes a fifth switch Q5, a sixth switch Q6, a seventh switch Q7, an eighth switch Q8, and a second flying capacitor CFLY2. Specifically, a first terminal of the fifth switch Q5 is connected to the voltage input terminal VBUS, a second terminal of the fifth switch Q5 is connected to the charge pump 30, and a third terminal of the fifth switch Q5 is connected to a first terminal of the sixth switch Q6. The third terminal of the sixth switch Q6 is connected to the first terminal of the seventh switch Q7. A third terminal of the seventh switch Q7 is connected to the first terminal of the eighth switch Q8, and a third terminal of the eighth switch Q8 is grounded. In some embodiments, the charging branch 10 draws power through the voltage input VBUS. One end of the voltage output terminal VOUT is connected between the third end of the sixth switch Q6 and the first end of the seventh switch Q7, and the second end of the voltage output terminal VOUT is connected to the positive electrode of the battery BAT. In some embodiments, the second charging branch 12 outputs power to the battery BAT through the voltage output terminal VOUT to charge the battery BAT.
A first terminal of the second flying capacitor CFLY2 is connected between the third terminal of the fifth switch Q5 and the first terminal of the sixth switch Q6, and a second terminal of the second flying capacitor CFLY2 is connected between the third terminal of the seventh switch Q7 and the first terminal of the eighth switch Q8. Specifically, the second charging branch 12 charges the battery BAT by charging the second flying capacitor CFLY2. Specifically, when the fifth switch Q5 and the seventh switch Q7 are turned on and the sixth switch Q6 and the eighth switch Q8 are turned off, the first flying capacitor CFLY1 is in a charging state. When the sixth switch Q6 and the eighth switch Q8 are turned on and the fifth switch Q5 and the seventh switch Q7 are turned off, the second flying capacitor CFLY2 is in a discharging state. In some embodiments, the second flying capacitor CFLY2 is discharged to the battery BAT through the voltage output terminal VOUT to charge the battery BAT.
In some embodiments, the fifth switch Q5, the seventh switch Q7 and the eighth switch Q8 are N-channel MOS transistors. The connection state of the substrate of the sixth switch Q6 is adjustable. Specifically, when the voltage of the first terminal of the sixth switch Q6 is less than the voltage of the third terminal of the sixth switch Q6, the substrate of the sixth switch Q6 is connected to the first terminal of the sixth switch Q6. When the voltage of the third terminal of the sixth switch Q6 is less than the voltage of the first terminal of the sixth switch Q6, the substrate of the sixth switch Q6 is connected to the third terminal of the sixth switch Q6. In some embodiments, when the sixth switch Q6 and the fourth switch Q4 are turned on and the second flying capacitor CFLY2 is charged through the output terminal VOUT, the voltage of the first terminal of the sixth switch Q6 is less than the voltage of the third terminal of the sixth switch Q6, so that the substrate of the sixth switch Q6 is connected to the first terminal of the sixth switch Q6 to prevent the current of the output terminal VOUT from flowing backward through the sixth switch Q6.
It can be understood that the circuit connection manner of the first charging branch 11 and the second charging branch 12 in fig. 3 is the same as or similar to the circuit connection manner of the charging branch 10 in fig. 2, and reference may be made to fig. 2 specifically, and details are not repeated here.
With continued reference to fig. 6, an embodiment of the present application further provides a battery device 200, which includes the charge pump charging circuit 100 and the battery BAT mentioned in the above embodiments, and the charge pump charging circuit 100 is connected to the battery BAT. For receiving an input voltage to charge the battery BAT.
Referring to fig. 7, an embodiment of the present application further provides an electric device 300, which includes a load 301 and a battery assembly 200. The battery assembly 200 is used to supply power to a load 301. In some embodiments, powered device 300 includes, but is not limited to, an electric motorcycle, an electric bicycle, an electric car, a cell phone, a tablet computer, a personal digital assistant, a personal computer, or any other suitable rechargeable device. The load 301 is at least one of various power consuming components of the power consuming device 300, such as a motor unit, a display unit, a Wireless Fidelity (Wi-Fi) unit, a bluetooth unit, and a speaker, which are not described herein again.
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 suitable modifications and changes of the above embodiments are within the scope of the present application as claimed.
Claims (10)
1. A charge pump charging circuit, comprising:
a charge pump control module; one end of the charging branch is connected with the input end so as to be connected with a power supply, the second end of the charging branch is connected with the charge pump control module, the third end of the charging branch is grounded, the fourth end of the charging branch is connected with the output end, and the output end is connected with a battery;
the charge pump control module is further connected to the battery to obtain voltage and current of the battery, and outputs a control signal to the charging branch circuit according to the obtained voltage and current of the battery to control the charging branch circuit to charge the battery.
2. The charge pump charging circuit of claim 1, wherein the charging branch comprises a flying capacitor and a first switch, a second switch, a third switch, and a fourth switch serially connected in sequence between the input terminal and ground;
wherein a first terminal of the first switch is connected to the input terminal, a second terminal of the first switch is connected to the charge pump control module, and a third terminal of the first switch is connected to a first terminal of the second switch; the third terminal of the second switch is connected to the first terminal of the third switch, the third terminal of the third switch is connected to the first terminal of the fourth switch, the third terminal of the fourth switch is connected to the ground, the second terminal of the second switch, the second terminal of the third switch and the second terminal of the fourth switch are all connected to the charge pump control module, and the output terminal is connected between the third terminal of the second switch and the first terminal of the third switch;
the first end of the flying capacitor is connected between the third end of the first switch and the first end of the second switch, the second end of the flying capacitor is connected between the third end of the third switch and the first end of the fourth switch, and the charge pump control module controls the first switch, the second switch, the third switch and the fourth switch to be switched on or off so as to charge the battery through the flying capacitor.
3. The charge pump charging circuit of claim 2, wherein the flying capacitor receives voltage through the input terminal for charging when the first switch and the third switch are turned on and the second switch and the fourth switch are turned off;
when the first switch and the third switch are turned off and the second switch and the fourth switch are turned on, the flying capacitor discharges to the battery through the output end to charge the battery.
4. The charge pump charging circuit of claim 3, wherein said charge pump control module comprises a control unit, a voltage sampling unit and a first comparison unit, wherein an input terminal of said voltage sampling unit is connected to two terminals of said battery, an output terminal of said voltage sampling unit is connected to an input terminal of said first comparison unit, and an output terminal of said first comparison unit is connected to said control unit;
the voltage sampling unit is used for acquiring the voltage of the battery and outputting the voltage to the first comparison unit;
the first comparison unit is used for comparing the voltage of the battery with a first reference voltage;
the control unit is used for outputting a first control signal to the first switch according to the comparison result of the first comparison unit so as to adjust the internal resistance of the first switch, thereby adjusting the voltage of the charging branch circuit and enabling the battery to enter a constant voltage charging mode.
5. The charge pump charging circuit of claim 4, wherein the voltage sampling unit comprises a first comparator, the first comparison unit comprises a second comparator, a first input terminal of the first comparator is connected to the positive pole of the battery, a second input terminal of the first comparator is connected to the negative pole of the battery, and an output terminal of the first comparator is connected to a first input terminal of the second comparator;
the second input end of the second comparator is used for receiving a second reference voltage, and the output end of the second comparator is connected to the control unit.
6. The charge pump charging circuit of claim 4, wherein the charge pump control module further comprises a current sampling unit and a second comparison unit, wherein an input terminal of the current sampling unit is connected to two terminals of a current sampling component connected in series with the battery, an output terminal of the current sampling unit is connected to an input terminal of the second comparison unit, and an output terminal of the second comparison unit is connected to the control unit;
the current sampling unit is used for acquiring voltages at two ends of the current sampling assembly and outputting the voltages to the second comparison unit;
the second comparison unit is used for comparing the voltage at two ends of the sampling component with a second reference voltage;
when the control unit confirms that the voltage at the two ends of the current sampling assembly is smaller than the second reference voltage through the second comparison unit, the control unit outputs a second control signal to the first switch to adjust the internal resistance of the first switch, so that the charging current of the charging branch circuit is adjusted, and the battery enters a constant current charging mode.
7. The charge pump charging circuit according to claim 6, wherein when the control unit confirms through the first comparing unit that the voltage of the battery is greater than or equal to the first reference voltage, the control unit outputs a third control signal to the first switch to control the first switch to be turned off to stop charging.
8. The charge pump charging circuit of claim 6, wherein the current sampling unit comprises a third comparator, the second comparing unit comprises a fourth comparator, a first input of the third comparator is connected to the first terminal of the current sampling component, and a second input of the third comparator is connected to the second terminal of the current sampling component; the output end of the third comparator is connected to the first input end of the fourth comparator;
a second input terminal of the fourth comparator is configured to receive the second reference voltage, and an output terminal of the fourth comparator is connected to the control unit.
9. A battery assembly comprising a battery and a charge pump charging circuit as claimed in any one of claims 1 to 8, the charge pump charging circuit being connected to the battery for receiving an input voltage to charge the battery.
10. A powered device comprising a load and the battery assembly of claim 9, the battery assembly being connected to the load to power the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310052682.XA CN115882568A (en) | 2023-02-02 | 2023-02-02 | Charge pump charging circuit, battery pack and electric device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310052682.XA CN115882568A (en) | 2023-02-02 | 2023-02-02 | Charge pump charging circuit, battery pack and electric device |
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| CN115882568A true CN115882568A (en) | 2023-03-31 |
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| CN113725958A (en) * | 2021-08-17 | 2021-11-30 | 珠海市魅族科技有限公司 | Battery power supply adjusting circuit, adjusting method, charging wire and terminal equipment |
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| CN106849645A (en) * | 2016-08-15 | 2017-06-13 | 珠海市魅族科技有限公司 | A kind of charging circuit, method and electronic installation |
| CN214755600U (en) * | 2021-03-19 | 2021-11-16 | 南京矽力微电子技术有限公司 | Charging circuit and charging equipment |
| CN113507149A (en) * | 2021-06-29 | 2021-10-15 | 珠海智融科技有限公司 | Mixed-mode charging circuit and charging method |
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