CN110676897A - Control method for battery charging, battery charging circuit and charging system - Google Patents
Control method for battery charging, battery charging circuit and charging system Download PDFInfo
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Abstract
The invention provides a battery charging control method, a battery charging circuit and a charging system, which are used for controlling two mutually independent charging branches on the same chip to charge a battery, wherein the two charging branches are respectively connected with the same input power supply, and the control method comprises the following steps of: s10, judging whether the charging current of the battery is smaller than a single-phase and double-phase switching current value, if so, entering a step S20, and if not, entering a step S30; s20, controlling one of the two charging branches to perform single-phase PWM charging on the battery; and S30, controlling the two charging branches to charge the battery in two phases in a staggered manner. Compared with single-phase charging, the average current of each branch is smaller, and therefore the loss of each branch is greatly reduced. Meanwhile, because the two branches work in a staggered phase mode, the voltage ripple of input and output can be reduced, and the requirement of a filter capacitor is lowered.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery charging control method, a battery charging circuit and a charging system.
Background
At present, most mobile devices use a built-in non-detachable battery design, and with the use of high strength, the cruising ability of the devices becomes one of the most concerned problems for users. Besides increasing the battery capacity, the quick charging is the most convenient and promising technical scheme for solving the problem of endurance. By utilizing the quick charging technology, the charging time of the equipment can be greatly shortened, the user experience is obviously improved, and the quick charging technology becomes an important direction for leading the development of batteries.
The existing quick charging technology mainly comprises two technical directions: increasing the voltage and increasing the current. By using the high-voltage quick-charging scheme, the high-current quick-charging scheme with high heat productivity in the charging process is large, the aging of electronic components and batteries can be accelerated, and potential safety hazards exist. By using the low-voltage high-current quick charging scheme, the heating value is relatively less, and the safety of the charging process is higher.
In the low-voltage high-current quick charging scheme, the charging is based on single-phase charging at present. The efficiency, heat generation, chip size, and the like of single-phase charging are greatly affected by current. In single-phase charging, the larger the charging current is, the more heat is generated, the lower the efficiency is, the larger the sizes of a power tube and an inductor are, and the design specification is difficult to meet.
In order to solve the problem of obvious heating during single-phase charging, a scheme of charging a battery by using two charging chips in parallel appears in the prior art. However, the technical scheme of charging one battery by using two charging chips has high cost and also increases the overall volume of the battery system.
Disclosure of Invention
Based on the above situation, the present invention is directed to a battery charging control method, a battery charging circuit and a charging system, so as to solve the problems of the prior art that the single-phase charging generates heat obviously and the charging cost is high when two chips are connected in parallel to charge one battery.
In order to achieve the above object, in a first aspect, the present invention adopts the following technical solutions:
a battery charging control method is used for controlling two charging branches which are independent of each other and located on the same chip to charge a battery, the two charging branches are respectively connected with the same input power supply, and in the process of charging the battery, the control method comprises the following steps:
s10, judging whether the charging current of the battery is smaller than a single-phase and double-phase switching current value, if so, entering a step S20, and if not, entering a step S30;
s20, controlling one of the two charging branches to perform single-phase PWM charging on the battery;
and S30, controlling the two charging branches to charge the battery in two phases in a staggered manner.
Preferably, before step S10, the control method further includes:
s00, judging whether the charging current of the battery is smaller than the mode switching current value, if so, entering the step S40, and if not, entering the step S10;
and S40, controlling one of the two charging branches to perform single-phase PFM charging on the battery.
Preferably, an inductor is disposed in the battery charging circuit, and in the two-phase charging process of the two charging branches for charging the battery in staggered phases, the control method includes:
and S50, judging whether the situation of continuous inductance current zero crossing exists in any one of the two charging branches, if so, entering the step S20, and if not, continuing to execute the step S30.
In order to achieve the above object, in a second aspect, the invention adopts the following technical solutions:
a battery charging circuit comprises a peripheral circuit, wherein the output end of the peripheral circuit is connected with a battery;
the charging circuit further includes:
a detection unit for detecting a charging current of the battery;
the storage unit is used for storing the single-phase switching current value and the double-phase switching current value;
and the first control unit is respectively connected with the detection unit and the storage unit, and is used for judging whether the charging current of the battery detected by the detection unit is smaller than the single-phase and double-phase switching current value stored in the storage unit or not, and controlling one of the two charging branches to carry out single-phase PWM charging on the battery or controlling the two charging branches to carry out double-phase charging on the battery in a staggered manner according to the judgment result.
Preferably, the charging circuit further comprises:
and the second control unit is respectively connected with the detection unit and the storage unit, and is used for judging whether the charging current of the battery detected by the detection unit is smaller than the switching current value stored in the storage unit or not and controlling one of the two charging branches to carry out single-phase PFM charging on the battery according to the judgment result.
Preferably, an inductor is arranged in the battery charging circuit;
the charging circuit further includes:
and the third control unit is connected with the detection unit and used for judging whether the continuous inductive current zero crossing exists in any one of the two charging branches.
Preferably, each of the charging branches includes:
the power supply access end is connected with an input power supply and is used for receiving the current output by the input power supply;
the connecting end is connected with the inductor of the peripheral circuit and is used for connecting the charging branch circuit with the peripheral circuit;
the grounding end is used for assisting in forming a power storage loop when the inductor discharges;
the first trigger part is arranged between the power supply access end and the connecting end, is connected with the control unit, and is used for conducting the power supply access end and the connecting end when receiving a first trigger signal sent by the control unit;
and the second trigger part is arranged between the connecting end and the grounding end, is connected with the control unit and is used for conducting the connecting end and the grounding end when receiving a second trigger signal sent by the control unit.
Preferably, the second trigger part includes a second MOS transistor, a diode is disposed between a drain and a source of the second MOS transistor, when the diode is triggered, the ground terminal is conducted with the connection terminal, a current flows from the ground terminal to the connection terminal, the drain of the second MOS transistor is connected to the connection segment, and the source of the second MOS transistor is connected to the ground terminal.
Preferably, the first trigger part comprises a first MOS transistor, a drain of the first MOS transistor is connected to the power input terminal, and a source of the first MOS transistor is connected to the connection segment;
the first MOS tube and the second MOS tube are both NMOS tubes.
Preferably, the peripheral circuit includes two inductors and a charging terminal connected to the battery;
each charging branch is respectively connected with an inductor in series and then connected with the charging end in parallel.
Preferably, the peripheral circuit includes an inductor and a charging terminal connected to the battery;
the two charging branches are connected in parallel, then connected in series with the inductor and then connected in series with the charging end.
In order to achieve the above object, in a third aspect, the invention adopts the following technical solutions:
a battery charging system comprising a battery charging circuit as described above.
According to the control method for battery charging, one of the two charging branches is controlled to perform single-phase PWM charging on the battery by comparing the charging current of the battery with the single-phase and double-phase switching current values, or the two charging branches are controlled to perform double-phase charging on the battery in a staggered mode, so that the battery can be charged in different charging modes according to the current in the battery charging process. When two charging branches are used for carrying out double-phase charging on the batteries in a staggered manner, the batteries can be rapidly charged with large current, high efficiency and low loss.
Because use two branch circuits of charging that are located same chip in this application to charge for the battery, for single-phase charging, the average current of each branch circuit is littleer, consequently the loss of each branch circuit reduces by a wide margin. Meanwhile, because the two branches work in a staggered phase mode, the voltage ripple of input and output can be reduced, and the requirement of a filter capacitor is lowered.
Drawings
Preferred embodiments of a control method of battery charging, a battery charging circuit, and a battery charging system according to the present invention will be described below with reference to the accompanying drawings. In the figure:
fig. 1 is one of schematic connection structures of a battery charging circuit according to a preferred embodiment of the present invention;
FIG. 2 is a second schematic diagram of the connection structure of the battery charging circuit according to a preferred embodiment of the present invention;
fig. 3 is a control flowchart of a control method of charging a battery according to a preferred embodiment of the present invention.
The reference signs are:
1. a peripheral circuit; 11. an output end; 12. a first inductor; 13. a second inductor; 14. a common inductor;
2. a chip circuit; 21. a first charging branch; 211. a first power supply access end; 212. a first connection end; 213. a first ground terminal; 214. a first power storage circuit; 22. a second charging branch; 221. a second power supply access end; 222. a second connection end; 223. a second ground terminal; 23. a first trigger section; 231. a first MOS transistor; 24. a second trigger section; 241. a second MOS transistor; 242. a first diode; 25. a third trigger section; 26. a fourth trigger section;
3. a charging terminal.
Detailed Description
The problem that single-phase charging in the prior art causes serious heating, and two chips are adopted to charge one battery, so that the cost is high is solved. The application provides a battery charging control method, a battery charging circuit and a battery charging system, which are used for improving the charging efficiency in the battery charging process and reducing the production cost and loss.
As shown in fig. 1, the battery charging circuit in the present application includes a peripheral circuit 1, wherein an output terminal 11 of the peripheral circuit 1 is connected to a battery (not shown in the figure), and the battery is directly charged through the output terminal 11. The charging circuit further comprises a chip circuit 2, the chip circuit 2 is connected with the peripheral circuit 1, the chip circuit 2 comprises two mutually independent charging branches, and the two charging branches are arranged in parallel. In a specific embodiment, the peripheral circuit 1 includes two mutually independent first inductors 12 and second inductors 13, the chip circuit 2 includes two parallel first charging branches 21 and second charging branches 22, the first charging branch 21 is connected in series with the first inductor 12, the second charging branch 22 is connected in series with the second inductor 13, and then connected in parallel, and further connected to the charging terminal 3, and each charging branch and the inductor connected in series therewith form a BUCK circuit. In an alternative embodiment, as shown in fig. 2, the peripheral circuit 1 includes a common inductor 14, two charging branches are connected in parallel and then connected in series with the common inductor 14, that is, a first charging branch 21 is connected in parallel with a second charging branch 22 and then connected in series with the common inductor 14 and further connected to the charging terminal 3, and the two charging branches share the common inductor 14 and respectively form a BUCK circuit with the common inductor 14.
As shown in fig. 1, the first charging branch 21 and the second charging branch 22 have the same structure, and the structure of the charging branch in the present application will be described in detail below by taking the first charging branch 21 as an example. The first charging branch 21 includes a first power input terminal 211, a first connection terminal 212, and a first ground terminal 213, wherein the first power input terminal 211 is connected to an input power source (not shown) for receiving a current output by the input power source. The first connection terminal 212 is connected in series with the first inductor 12 in the peripheral circuit for connecting the first charging branch 21 and the peripheral circuit 1. The first ground 213 is used to assist in forming the first power storage circuit 214 when the first inductor 12 is discharged.
The first charging branch 21 further includes a first trigger portion 23 disposed between the first power supply connection end 211 and the first connection end 212, the first trigger portion 23 includes a first MOS transistor 231, the first MOS transistor 231 is an NMOS transistor, a drain of the first MOS transistor 231 is connected to the first power supply connection end 211, a source of the first MOS transistor 231 is connected to the first connection end 212, and a gate of the first MOS transistor 231 is connected to the control unit of the battery charging circuit. When the controller sends the first trigger signal to the first MOS transistor 231, the gate of the first MOS transistor 231 is triggered, the drain thereof is conducted with the source thereof, so that the first power supply connection end 211 is conducted with the first connection end 212, and the current of the input power supply flows through the first power supply connection end 211, the first MOS transistor 231 and the first connection end 212 and enters the peripheral circuit 1.
The first charging branch 21 further includes a second trigger part 24 disposed between the first connection end 212 and the first ground end 213, the second trigger part 24 includes a second MOS transistor 241, the second MOS transistor 241 is an NMOS transistor, a drain of the second MOS transistor 241 is connected to the first connection end 212, a source of the second MOS transistor 241 is connected to the first ground end 213, a gate of the second MOS transistor 241 is connected to a controller of the battery charging circuit, and a first diode 242 is disposed in parallel between the drain and the source of the second MOS transistor 241. When the first inductor 12 generates a self-inductance, the controller sends a second trigger signal to the second MOS transistor 241, the gate of the second MOS transistor 241 is triggered, the drain is conducted with the source, so that the first ground terminal 213 is conducted with the first connection terminal 212, and the self-inductance current generated by the first inductor 12 flows to the first ground terminal 213 through the first connection terminal 212 and the second MOS transistor 241. Since the first diode 242 is disposed between the first ground terminal 213 and the first connection terminal 212, the first ground terminal 213 cannot form a current path, and at this time, the first diode 242 is turned on, and the current flows from the first ground terminal 213 to the first connection terminal 212 through the first diode 242, and further flows to the charging terminal 3 connected to the battery through the first inductor 12, thereby forming the first power storage loop 214.
As shown in fig. 1, the second charging branch 22 includes a second power input terminal 221 connected to an input power source (not shown), and the first power input terminal 211 and the second power input terminal 221 share the same input power source. Second charging branch 22 further includes a second connection terminal 222 and a second ground terminal 223, and a third trigger part 25 disposed between second power supply connection terminal 221 and second connection terminal 222, and a fourth trigger part 26 disposed between second connection terminal 222 and second ground terminal 223. The third trigger part 25 has the same structure as the first trigger part 23, the fourth trigger part 26 has the same structure as the second trigger part 24, and the working principle is the same, which will not be described again.
Further, the charging circuit in the present application further includes a detection unit (not shown in the figure), a storage unit (not shown in the figure), and a controller (not shown in the figure), wherein the detection unit is disposed in the peripheral circuit 1 and is used for detecting the charging current and the inductor current of the battery. And the storage unit is used for storing the single-phase and double-phase switching current value and the mode switching current value so as to enable the controller to compare the single-phase and double-phase switching current value and the mode switching current value stored in the storage unit with the charging current. And the controller is used for sending trigger signals to the first trigger part 23, the second trigger part 24, the third trigger part 25 and the fourth trigger part 26 according to the charging current of the battery detected by the detection unit and the single-phase and double-phase switching current values and the mode switching current values stored in the storage unit, and further controlling the working modes of the first charging branch 21 and the second charging branch 22 so as to charge the battery in different modes according to different charging currents. Specifically, the controller comprises a first control unit, the first control unit is respectively connected with the detection unit and the storage unit, and is used for judging whether the charging current of the battery detected by the detection unit is smaller than the single-phase and double-phase switching current value stored in the storage unit, and controlling one of the two charging branches to perform single-phase PWM charging on the battery according to the judgment result, or controlling the two charging branches to perform double-phase charging on the battery in a staggered manner. The controller also comprises a second control unit which is respectively connected with the detection unit and the storage unit and used for judging whether the charging current of the battery detected by the detection unit is smaller than the mode switching current value stored by the storage unit or not and controlling one of the two charging branches to carry out single-phase PFM charging on the battery according to the judgment result. The controller also comprises a third control unit which is connected with the detection unit and used for judging whether the continuous inductive current zero crossing exists in any one of the two charging branches. The controller further comprises a signal output unit which is respectively connected with the first trigger part, the second trigger part, the third trigger part and the fourth trigger part, so that signals are respectively output to the first trigger part, the second trigger part, the third trigger part and the fourth trigger part according to judgment results of the first control unit, the second control unit and the third control unit, and the first charging branch and the second charging branch are controlled to charge the battery in different modes. The signal output unit outputs a level signal, such as a high level signal or a low level signal, to the first trigger part, the second trigger part, the third trigger part and the fourth trigger part.
The application also provides a charging system, and the charging system is provided with the battery charging circuit.
In a specific embodiment, as shown in fig. 3, the present application further provides a battery charging control method for controlling the battery charging circuit. The control method comprises the following steps:
s00, judging whether the charging current of the battery is smaller than the mode switching current value, if so, entering the step S40, and if not, entering the step S10;
in step S00, the second control unit determines whether the charging current detected by the detection unit is smaller than the mode switching current value stored in the storage unit, and controls the operation modes of the two charging branches according to the determination result.
And S40, controlling one of the two charging branches to perform single-phase PFM charging on the battery.
In this step, the signal output unit sends control signals to the first trigger unit, the second trigger unit, the third trigger unit, and the fourth trigger unit, respectively, and may control the first charging branch to perform single-phase PFM charging on the battery, or may control the second charging branch to perform single-phase PFM charging on the battery. For example, when the first charging branch is controlled to perform single-phase PFM charging on the battery, the signal output unit outputs a first trigger signal (high level) to the first trigger portion, and the signal output unit outputs a low level signal to the second trigger portion, the third trigger portion, and the fourth trigger portion, at this time, the second trigger portion, the third trigger portion, and the fourth trigger portion are in a non-conducting state. The current output by the input power supply flows into the peripheral circuit through the first power supply access end, the first trigger part and the first connecting end, and then the battery is charged. Since the charging current value is smaller than the mode switching current value, which indicates that the current value required in the battery charging process is smaller at this time, the PFM mode can be used for charging. PFM mode, i.e. pulse frequency modulation mode, is commonly applied in DC-DC converters to improve light load efficiency, also referred to as "power saving" mode. When the PFM mode is adopted, the frequency of the first trigger signal sent from the signal output unit to the first trigger section is adjusted.
The signal output unit outputs a first trigger signal to the first trigger part, and the first trigger part is triggered to conduct to charge the battery once in the whole time length T, wherein the whole time length T comprises a first trigger signal duration time length T1 and a first inductor self-inductance current generation time length T2, and T1+ T2 is T. During the duration of the first trigger signal T1, the first trigger is triggered to turn on and the second trigger is in an off state. The battery is charged by current output by the input power supply, the first trigger part is in a cut-off state in the process of the self-inductance current time length T2 generated by the first inductor, the signal output unit outputs high level to the second trigger part, the second trigger part is in a conducting state, and the self-inductance current generated by the first inductor continues to charge the battery after passing through the power storage loop formed by the first diode.
And S10, judging whether the charging current of the battery is smaller than the single-phase and double-phase switching current value, if so, entering the step S20, and if not, entering the step S30.
In step S10, the first control unit determines whether the charging current detected by the detection unit is smaller than the single-phase and double-phase switching current values, and controls the operation modes of the two charging branches according to the determination result. The judging step can dynamically adjust the charging mode according to the charging current, when the charging current of the battery is large, the first charging branch and the second charging branch charge the battery in a staggered mode, when the charging current is small, any one of the first charging branch and the second charging branch is controlled to charge the battery, and high-efficiency charging is achieved in a wide load range.
And S20, controlling one of the two charging branches to perform single-phase PWM charging on the battery.
In this step, the signal output unit sends control signals to the first trigger unit, the second trigger unit, the third trigger unit, and the fourth trigger unit, respectively, and may control the first charging branch to perform single-phase PWM charging on the battery, or may control the second charging branch to perform single-phase PWM charging on the battery. For example, when the first charging branch is controlled to perform single-phase PWM charging on the battery, the signal output unit outputs a first trigger signal (high level) to the first trigger unit, and the signal output unit outputs a low level signal to the second trigger unit, the third trigger unit, and the fourth trigger unit, at this time, the second trigger unit, the third trigger unit, and the fourth trigger unit are in a non-conducting state. The current output by the input power supply flows into the peripheral circuit through the first power supply access end, the first trigger part and the first connecting end, and then the battery is charged. The PWM mode is a pulse width modulation mode that maintains extremely high efficiency over a wide range of current output when used under heavy load current conditions during battery charging. When the PWM mode is adopted, the pulse width of a first trigger signal sent to the first trigger part by the signal output unit is adjusted, the attenuation of the pulse signal is slower as the pulse width is wider, and the charging time is longer in the process of one pulse signal.
In this step, the first inductor also generates a self-induced current, and when the single-phase PWM charging is performed on the battery, the triggering manner of the signal output unit for the first triggering portion and the second triggering portion is the same as the triggering manner when the single-phase PFM charging is performed on the battery, and details thereof are not repeated.
And S30, controlling the two charging branches to charge the battery in two phases in a staggered manner.
In this step, because the load is heavy, the charging current required by the battery is large, and at this time, the signal output unit sends control signals to the first trigger part, the second trigger part, the third trigger part and the fourth trigger part respectively to control the first charging branch and the second charging branch to charge the battery in a wrong way. During charging, the phase difference between the first charging branch and the second charging branch differs by a predetermined angle, preferably 180 °. In a specific embodiment, the first charging branch charges the battery, and during charging, the first trigger signal output by the signal output unit to the first trigger unit is output by a PWM method. Specifically, the signal output unit outputs a first trigger signal (high level) to the first trigger portion, the signal output unit outputs a low level signal to the second trigger portion, the third trigger portion and the fourth trigger portion, the first trigger signal lasts for a time period of T1, and at this time, the second trigger portion, the third trigger portion and the fourth trigger portion are in a non-conducting state. During the duration of the first trigger signal T1, the first trigger is triggered to turn on and the second trigger is in an off state. The battery is charged by current output by an input power supply, the first trigger part is in a cut-off state in the process of the self-inductance current time length T2 generated by the first inductor, the control unit outputs high level to the second trigger part, the second trigger part is in a conducting state, and the self-inductance current generated by the first inductor continues to charge the battery after passing through an electric storage loop formed by the first diode. The total charging time of the first charging branch to the battery is T1+ T2.
After the first charging branch finishes charging, the second charging branch takes over the first charging branch to charge the battery. When the second charging branch charges the battery, the second trigger signal output by the signal output unit to the third trigger part is output in a PWM mode. Specifically, the signal output unit outputs a second trigger signal (high level) to the second trigger portion, the control unit outputs a low level signal to the first trigger portion, the second trigger portion, and the fourth trigger portion, the second trigger signal lasts for a time period of T3, and at this time, the first trigger portion, the second trigger portion, and the fourth trigger portion are in a non-conducting state. During the duration T3 of the second trigger signal, the third trigger is triggered to turn on and the fourth trigger is in an off state. The battery is charged by current output by the input power supply, the third trigger part is in a cut-off state in the process of the self-inductance current time length T4 generated by the second inductor, the control unit outputs high level to the fourth trigger part, the fourth trigger part is in a conducting state, and the self-inductance current generated by the second inductor continues to charge the battery after passing through the power storage loop formed by the second diode. The total charging time of the battery by the second charging branch is T3+ T4.
T ═ T', so that the first charging branch and the second charging branch can be charged with a phase difference of 180 ° in a phase-staggered manner. When the first charging branch circuit and the second charging branch circuit are charged in a staggered phase mode, the average current of each charging branch circuit is half of the total output current, the switching loss and the output current ripple are reduced, the value of the inductance is smaller, the phase difference is 180 degrees, the staggered phase charging can also reduce the capacitance, and the power density of the system is improved.
Further, the control method for charging the battery further comprises the following steps:
and step S50, judging whether the situation of continuous inductance current zero crossing exists in any one of the two charging branches, if so, entering step S20, and if not, continuing to execute step S30.
The step is continuously carried out in the process of charging the battery, and once the condition that the continuous inductive current crosses zero is found, the charging mode of the circuit is immediately switched, so that potential safety hazards are avoided.
When the battery charging control method and the battery charging circuit in the application are used for charging the battery, the large current of 5A can be quickly charged, the problem of large heat productivity in the charging process can be effectively avoided, meanwhile, the volumes of the power tube and the inductor can be correspondingly reduced, and the volume of the system and the complexity of design are reduced. Meanwhile, two chips are not used any more, and two charging branches are arranged on the same chip, so that the production cost is reduced, the freedom of type selection is increased, and the flexibility of heat management and chip packaging is facilitated.
It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.
Claims (12)
1. A battery charging control method is used for controlling two charging branches which are independent of each other and located on the same chip to charge a battery, wherein the two charging branches are respectively connected with the same input power supply, and the battery charging control method is characterized by comprising the following steps of:
s10, judging whether the charging current of the battery is smaller than a single-phase and double-phase switching current value, if so, entering a step S20, and if not, entering a step S30;
s20, controlling one of the two charging branches to perform single-phase PWM charging on the battery;
and S30, controlling the two charging branches to charge the battery in two phases in a staggered manner.
2. The control method of battery charging according to claim 1, wherein before step S10, the control method further comprises:
s00, judging whether the charging current of the battery is smaller than the mode switching current value, if so, entering the step S40, and if not, entering the step S10;
and S40, controlling one of the two charging branches to perform single-phase PFM charging on the battery.
3. The method for controlling battery charging according to claim 1, wherein an inductor is disposed in the battery charging circuit, and during the two-phase charging process of the battery with two charging branches staggered with respect to each other, the method comprises:
and S50, judging whether the situation of continuous inductance current zero crossing exists in any one of the two charging branches, if so, entering the step S20, and if not, continuing to execute the step S30.
4. A battery charging circuit comprises a peripheral circuit, wherein the output end of the peripheral circuit is connected with a battery;
the charging circuit further includes:
a detection unit for detecting a charging current of the battery;
the storage unit is used for storing the single-phase switching current value and the double-phase switching current value;
and the first control unit is respectively connected with the detection unit and the storage unit, and is used for judging whether the charging current of the battery detected by the detection unit is smaller than the single-phase and double-phase switching current value stored in the storage unit or not, and controlling one of the two charging branches to carry out single-phase PWM charging on the battery or controlling the two charging branches to carry out double-phase charging on the battery in a staggered manner according to the judgment result.
5. The battery charging circuit of claim 4, further comprising:
and the second control unit is respectively connected with the detection unit and the storage unit, and is used for judging whether the charging current of the battery detected by the detection unit is smaller than the switching current value stored in the storage unit or not and controlling one of the two charging branches to carry out single-phase PFM charging on the battery according to the judgment result.
6. The battery charging circuit of claim 5, wherein an inductor is disposed in the battery charging circuit;
the charging circuit further includes:
and the third control unit is connected with the detection unit and used for judging whether the continuous inductive current zero crossing exists in any one of the two charging branches.
7. The battery charging circuit of claim 6, wherein each charging branch comprises:
the power supply access end is connected with an input power supply and is used for receiving the current output by the input power supply;
the connecting end is connected with the inductor of the peripheral circuit and is used for connecting the charging branch circuit with the peripheral circuit;
the grounding end is used for assisting in forming a power storage loop when the inductor discharges;
the first trigger part is arranged between the power supply access end and the connecting end, is connected with the control unit, and is used for conducting the power supply access end and the connecting end when receiving a first trigger signal sent by the control unit;
and the second trigger part is arranged between the connecting end and the grounding end, is connected with the control unit and is used for conducting the connecting end and the grounding end when receiving a second trigger signal sent by the control unit.
8. The battery charging circuit according to claim 7, wherein the second trigger portion comprises a second MOS transistor, a diode is disposed between a drain and a source of the second MOS transistor, when the diode is triggered, the ground terminal is conducted with the connection terminal, current flows from the ground terminal to the connection terminal, the drain of the second MOS transistor is connected to the connection segment, and the source of the second MOS transistor is connected to the ground terminal.
9. The battery charging circuit of claim 8, wherein the first trigger part comprises a first MOS transistor, a drain of the first MOS transistor is connected to the power input terminal, and a source of the first MOS transistor is connected to the connection segment;
the first MOS tube and the second MOS tube are both NMOS tubes.
10. A battery charging circuit according to any of claims 4 to 9, wherein said peripheral circuit comprises two inductors and a charging terminal connected to said battery;
each charging branch is respectively connected with an inductor in series and then connected with the charging end in parallel.
11. The battery charging circuit according to any of claims 54 to 9, wherein said peripheral circuit comprises an inductor and a charging terminal connected to said battery;
the two charging branches are connected in parallel, then connected in series with the inductor and then connected in series with the charging end.
12. A battery charging system, characterized in that it comprises a battery charging circuit according to any one of claims 4 to 11.
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| CN103138325A (en) * | 2011-12-01 | 2013-06-05 | 英特赛尔美国有限公司 | Control system and method for shared inductor regulator |
| CN105098895A (en) * | 2015-07-28 | 2015-11-25 | 努比亚技术有限公司 | Charging control device and method |
| CN106300555A (en) * | 2016-10-13 | 2017-01-04 | 深圳市金立通信设备有限公司 | A kind of charging circuit and charging method thereof and terminal |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138325A (en) * | 2011-12-01 | 2013-06-05 | 英特赛尔美国有限公司 | Control system and method for shared inductor regulator |
| CN105098895A (en) * | 2015-07-28 | 2015-11-25 | 努比亚技术有限公司 | Charging control device and method |
| CN106300555A (en) * | 2016-10-13 | 2017-01-04 | 深圳市金立通信设备有限公司 | A kind of charging circuit and charging method thereof and terminal |
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