CN113824167B - Charging circuit and charging method - Google Patents
Charging circuit and charging method Download PDFInfo
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- CN113824167B CN113824167B CN202010568953.3A CN202010568953A CN113824167B CN 113824167 B CN113824167 B CN 113824167B CN 202010568953 A CN202010568953 A CN 202010568953A CN 113824167 B CN113824167 B CN 113824167B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a charging circuit and a charging method, comprising a reverse cut-off unit and a charging chip corresponding to the reverse cut-off unit, wherein the input end of the reverse cut-off unit is connected with a power supply, the output end of the reverse cut-off unit is connected with the voltage input end of the charging chip, and when the voltage value of the input end of the reverse cut-off unit is smaller than that of the output end of the reverse cut-off unit, a passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit is disconnected; and the charging chip is corresponding to the reverse cut-off unit and is used for collecting the voltage value output by the reverse cut-off unit in real time, comparing the collected voltage value of the output end of the reverse cut-off unit with the current threshold voltage value, determining a current value according to the comparison result and charging by using the current value. The reverse cut-off unit in the charging circuit can replace components with reverse cut-off function inside the charging chip, so that the size of the chip can be reduced, and the occupied space of the charging chip on the PCB is reduced.
Description
Technical Field
The invention relates to the technical field of charging, in particular to a charging circuit and a charging method.
Background
With the rapid development of smart phones, the charging speed and the temperature rise experience are concerned by users. The traditional single-charging scheme can not meet the higher charging requirement of a user, the emerging low-voltage direct-charging or flash charging scheme can increase the design cost, and the parallel charging scheme has the design cost and the charging speed, so that the charging scheme with the best current cost performance is realized.
The parallel charging design comprises a main charging chip and an auxiliary charging chip, when the parallel charging mode is used for charging, the whole charging path is uniformly controlled through the main charging chip, partial current flows to the battery from the main charging chip, and the other partial current flows to the auxiliary charging chip from the main charging chip and then flows to the battery through the auxiliary charging chip.
The charging chip used at present has larger volume and occupies larger space on the PCB.
Disclosure of Invention
The invention provides a charging circuit and a charging method, which are used for solving the problems of larger volume of a charging chip and larger occupied space on a PCB in the prior art.
In a first aspect, an embodiment of the present invention provides a charging circuit, including: at least one reverse cut-off unit and a charging chip corresponding to the reverse cut-off unit;
The input end of the reverse cut-off unit is connected with a power supply, the output end of the reverse cut-off unit is connected with the voltage input end of the charging chip, and the power supply is used for switching on a passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit when the voltage value of the input end of the reverse cut-off unit is larger than or equal to a preset voltage value, and switching off the passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit when the voltage value of the input end of the reverse cut-off unit is smaller than the voltage value of the output end of the reverse cut-off unit; the charging chip is corresponding to the reverse cut-off unit;
the charging chip corresponding to the reverse cut-off unit is used for collecting the voltage value of the output end of the reverse cut-off unit in real time; when the voltage value of the output end of the reverse cut-off unit is smaller than the threshold voltage value of the highest level, the threshold voltage value of the highest level is downwards regulated by one level according to a preset differential pressure residual value, the collected voltage value of the output end of the reverse cut-off unit is compared with the current threshold voltage value after being downwards regulated, a first charging current value is determined according to a comparison result, and the current corresponding to the first charging current value is used for charging.
Optionally, in an embodiment of the present invention, the charging chip is specifically configured to, when determining the first charging current value according to the comparison result:
if the acquired voltage value of the output end of the reverse cut-off unit is larger than or equal to the current threshold voltage value after the down regulation, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value; or (b)
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, continuing to downwards regulate the current threshold voltage value after the down regulation by one level according to the residual pressure value until the collected voltage value of the output end of the reverse cut-off unit is larger than or equal to the current threshold voltage value after the down regulation, and taking a current value corresponding to the current threshold voltage value after the down regulation as a first charging current value; or (b)
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, continuing to down regulate the current threshold voltage value after the down regulation by one level according to the differential pressure residual value, and if the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after each down regulation, determining a first charging current value according to the threshold voltage value of the lowest level after the current threshold voltage value is equal to the threshold voltage value of the lowest level.
Optionally, the charging chip is specifically configured to:
In the process that the current value of the input end of the reverse cut-off unit is gradually increased from a preset current value, if the acquired voltage value of the output end of the reverse cut-off unit is larger than the lowest threshold voltage value, taking the increased current value as the first charging current value, and continuously gradually increasing the current value of the input end of the reverse cut-off unit;
And if the acquired voltage value of the output end of the reverse cut-off unit is smaller than or equal to the lowest threshold voltage value, taking the current value of the previous stage of the current value after the increase as the first charging current value, and stopping increasing the current value of the input end of the reverse cut-off unit step by step.
Optionally, the charging chip is further configured to:
And if the voltage value of the output end of the reverse cut-off unit is larger than or equal to the threshold voltage value of the highest level, taking the current value corresponding to the threshold voltage value of the highest level as a charging current value.
Optionally, the charging device further comprises at least one charging chip which does not correspond to the reverse cut-off unit;
The input end of the charging chip which is not corresponding to the reverse cut-off unit is connected with the power supply, the output end of the charging chip which is not corresponding to the reverse cut-off unit is used as the output end of the charging circuit, and the charging circuit is used for conducting a passage between the input end and the output end of the charging chip which is not corresponding to the reverse cut-off unit when the voltage value of the input end of the charging chip which is not corresponding to the reverse cut-off unit is larger than the preset voltage value, and charging by using the current corresponding to the sum of the first charging current value and the preset second charging current value.
Optionally, the reverse cut-off unit includes at least one power diode.
Optionally, if the reverse cut-off unit includes a plurality of power diodes, the plurality of power diodes are connected in parallel.
In a second aspect, an embodiment of the present invention further provides a charging method of a charging circuit according to the embodiment of the present invention, including:
when the voltage value of the output end of the reverse cut-off unit is smaller than a preset highest-level threshold voltage value, the highest-level threshold voltage value is downwards regulated by one stage according to a preset differential pressure residual value;
Comparing the acquired voltage value of the output end of the reverse cut-off unit with the threshold voltage value after the step-down, and determining a first charging current value according to a comparison result;
and charging by using the current corresponding to the first charging current value.
Optionally, the determining the first charging current value according to the comparison result includes:
if the acquired voltage value of the output end of the reverse cut-off unit is larger than or equal to the threshold voltage value after the step-down, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value;
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, continuing to downwards regulate the threshold voltage value after the down regulation by one level according to the residual pressure value until the collected voltage value of the output end of the reverse cut-off unit is larger than or equal to the current threshold voltage value after the down regulation, and taking a current value corresponding to the current threshold voltage value after the down regulation as a first charging current value; or (b)
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the threshold voltage value after the down regulation, continuing to down regulate the threshold voltage value after the down regulation by one level according to the differential pressure residual value, and if the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after each down regulation, determining the first charging current value according to the threshold voltage value of the lowest level after the current threshold voltage value is equal to the threshold voltage value of the lowest level.
Optionally, the determining the first charging current value according to the lowest level threshold voltage value includes:
In the process that the current value of the input end of the reverse cut-off unit is gradually increased from a preset current value, if the acquired voltage value of the output end of the reverse cut-off unit is larger than the lowest threshold voltage value, taking the increased current value as the first charging current value, and continuously gradually increasing the current value of the input end of the reverse cut-off unit;
And if the acquired voltage value of the output end of the reverse cut-off unit is smaller than or equal to the lowest threshold voltage value, taking the current value of the previous stage of the current value after the increase as the first charging current value, and stopping increasing the current value of the input end of the reverse cut-off unit step by step.
Optionally, the method further comprises:
And if the voltage value of the output end of the reverse cut-off unit is larger than or equal to the threshold voltage value of the highest level, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value.
Optionally, the method further comprises:
When the voltage value of the input end of the charging chip which is not corresponding to the reverse cut-off unit is larger than the preset voltage value, a passage between the input end and the output end of the charging chip which is not corresponding to the reverse cut-off unit is conducted, and the charging is conducted by using the current corresponding to the sum of the first charging current value and the preset second charging current value.
According to the charging circuit and the charging method provided by the embodiment of the invention, the input end of the reverse cut-off unit is connected with the power supply, the output end of the reverse cut-off unit is connected with the voltage input end of the charging chip, the charging circuit is used for switching on a passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit when the voltage value of the input end of the reverse cut-off unit is larger than or equal to a preset voltage value, and switching off the passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit when the voltage value of the input end of the reverse cut-off unit is smaller than the voltage value of the output end of the reverse cut-off unit, wherein the charging chip is the charging chip corresponding to the reverse cut-off unit; and the charging chip is used for collecting the voltage value output by the reverse cut-off unit in real time, when the voltage value output by the reverse cut-off unit is smaller than the threshold voltage value of the highest level, the threshold voltage value of the highest level is downwards regulated by one level according to the preset differential pressure residual value, the collected voltage value of the output end of the reverse cut-off unit is compared with the current threshold voltage value after being downwards regulated, a first current value is determined according to the comparison result, and the first current value is used for charging. Because the charging circuit in the embodiment of the invention comprises the reverse cut-off unit and the charging chip corresponding to the reverse cut-off unit, the reverse cut-off unit can prevent current from flowing from the battery to the power supply, so that components with reverse cut-off function can be canceled in the charging chip, the size of the chip can be reduced, and the space occupied by the charging chip on the PCB board can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it will be apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a charging circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a reverse cut-off unit comprising a diode according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of a reverse cut-off unit according to the embodiment of the present invention, wherein the reverse cut-off unit comprises two parallel diodes;
fig. 4 is a schematic structural diagram of a parallel charging circuit according to an embodiment of the present invention;
Fig. 5 is a schematic flow chart of a charging method of the charging circuit according to the embodiment of the invention;
fig. 6 is a complete flowchart of a charging method according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution and advantages of the present application more clear, specific embodiments of a charging circuit and a charging method based on the charging circuit provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the following description of the preferred embodiments is provided for the purpose of illustrating and explaining the application, and is not intended to limit the application. And embodiments of the application and features of the embodiments may be combined with each other without conflict. It should be noted that the shapes of the figures in the drawings do not reflect true proportions, and are intended to illustrate the present application only. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
The implementation of the present invention provides a charging circuit, as shown in fig. 1, which may include: at least one reverse blocking unit 10 and a charging chip 11 corresponding to the reverse blocking unit;
The input end of the reverse cut-off unit 10 is connected with a power supply, the output end of the reverse cut-off unit 10 is connected with the voltage input end of the charging chip 11, and is used for switching on a passage between the input end of the reverse cut-off unit 10 and the output end of the reverse cut-off unit 10 when the voltage value of the input end of the reverse cut-off unit 10 is larger than or equal to a preset voltage value, and switching off the passage between the input end of the reverse cut-off unit 10 and the output end of the reverse cut-off unit 10 when the voltage value of the input end of the reverse cut-off unit 10 is smaller than the voltage value of the output end of the reverse cut-off unit 10; wherein the charging chip 11 is a charging chip corresponding to the reverse cut-off unit 10;
The charging chip 11 corresponding to the reverse cut-off unit 10 is used for collecting the voltage value of the output end of the reverse cut-off unit 10 in real time; when the voltage value of the output end of the reverse cut-off unit is smaller than the threshold voltage value of the highest level, the threshold voltage value of the highest level is downwards regulated by one level according to a preset differential pressure residual value, the collected voltage value of the output end of the reverse cut-off unit is compared with the current threshold voltage value after being downwards regulated, a first charging current value is determined according to a comparison result, and the current corresponding to the first charging current value is used for charging.
According to the charging circuit provided by the embodiment of the invention, the input end of the reverse cut-off unit is connected with the power supply, the output end of the reverse cut-off unit is connected with the voltage input end of the charging chip, the charging circuit is used for switching on a passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit when the voltage value of the input end of the reverse cut-off unit is larger than or equal to a preset voltage value, and switching off the passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit when the voltage value of the input end of the reverse cut-off unit is smaller than the voltage value of the output end of the reverse cut-off unit, wherein the charging chip is the charging chip corresponding to the reverse cut-off unit; and the charging chip is used for collecting the voltage value output by the reverse cut-off unit in real time, when the voltage value output by the reverse cut-off unit is smaller than the threshold voltage value of the highest level, the threshold voltage value of the highest level is downwards regulated by one level according to the preset differential pressure residual value, the collected voltage value of the output end of the reverse cut-off unit is compared with the current threshold voltage value after being downwards regulated, a first current value is determined according to the comparison result, and the first current value is used for charging. Because the charging circuit in the embodiment of the invention comprises the reverse cut-off unit and the charging chip corresponding to the reverse cut-off unit, the reverse cut-off unit can prevent current from flowing from the battery to the power supply, so that components with reverse cut-off function can be canceled in the charging chip, the size of the chip can be reduced, and the space occupied by the charging chip on the PCB board can be reduced.
The charging circuit provided by the embodiment of the invention not only can be compatible with a charging chip of an internal MOS tube-free control circuit, but also can prevent the power adapter from receiving more than 5V voltage when the input end outputs more than 5V voltage under the abnormal condition of the charging chip, thereby playing a role in protecting the power adapter.
In particular implementations, the reverse cut-off unit 10 may include at least one power diode, which may be a low-impedance, high-current power diode, as shown in fig. 2. The diode may block current from flowing from the cathode of the diode to the anode of the diode when the voltage value of the cathode of the diode is greater than the voltage value of the anode. The low-impedance and high-current power diode can lower the voltage drop during charging and has higher efficiency.
Fig. 2 shows a schematic structure of a reverse cut-off unit composed of one diode, and in order to reduce the impedance of a charging path and thus reduce the voltage drop of the charging path under the condition of constant charging current, the reverse cut-off unit may include a plurality of diodes connected in parallel, as shown in fig. 3, which is a schematic structure of the reverse cut-off unit including two diodes connected in parallel.
The threshold voltage values in the embodiments of the present invention will be briefly described below. In the embodiment of the present invention, there are a plurality of levels of threshold voltage values, for example, there are 5 levels of threshold voltage values, which are respectively a highest level threshold voltage value, a second level threshold voltage value, a third level threshold voltage value, a fourth level threshold voltage value, and a minimum level threshold voltage value. The threshold voltage value of each level corresponds to a current value, and the threshold voltage value and the current value corresponding to the threshold voltage value may be pre-configured to be stored in the charging chip. For example, the highest level threshold voltage value is 5V and the corresponding current value is 3A.
In the implementation, after receiving the current output by the reverse cut-off unit, the charging chip firstly compares the voltage value output by the current collected reverse cut-off unit with the threshold voltage value of the highest level, and if the voltage value output by the current collected reverse cut-off unit is greater than or equal to the threshold voltage value of the highest level, the current value corresponding to the threshold voltage value of the highest level is used as a first charging current value; and if the voltage value output by the current collected reverse cut-off unit is smaller than the threshold voltage value of the highest level, the threshold voltage value of the highest level is downwards regulated by one level according to the preset differential pressure residual value, the voltage value of the output end of the collected reverse cut-off unit is compared with the current threshold voltage value after the downwards regulation, a first charging current value is determined according to a comparison result, and the current corresponding to the first charging current value is used for charging.
In a specific implementation, the charging chip may determine the first charging current value according to the comparison result in the following three ways.
In the first mode, if the collected voltage value of the output end of the reverse cut-off unit is greater than or equal to the current threshold voltage value after the down-regulation, the current value corresponding to the threshold voltage value of the highest level is used as the first charging current value.
For example, the collected voltage value of the output end of the reverse cut-off unit is 4.9V, the threshold voltage value of the highest level is 5V, the current threshold voltage value after one level is adjusted downwards is 4.8V, the collected voltage value of the output end of the reverse cut-off unit is 4.9V greater than the current threshold voltage value after one level is adjusted downwards, and the current value 3A corresponding to the threshold voltage value of the highest level, 5V, is taken as the first charging current value.
And if the voltage value of the output end of the collected reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, continuing to downwards regulate the current threshold voltage value after the down regulation by one stage according to the differential pressure residual value until the voltage value of the output end of the collected reverse cut-off unit is larger than or equal to the current threshold voltage value after the down regulation, and taking the current value corresponding to the current threshold voltage value after the down regulation as a first charging current value.
For example, the voltage value of the output end of the collected reverse cut-off unit is 4.8V, the threshold voltage value of the highest level is 5V, the current threshold voltage value after the first level is adjusted downwards is 4.85V, the voltage value of the output end of the collected reverse cut-off unit is 4.8V smaller than the current threshold voltage value after the first level is adjusted downwards, the threshold voltage value is continuously adjusted downwards by one level to be 4.7V, then the voltage value of the output end of the collected reverse cut-off unit is 4.75V larger than 4.7V, and the current value corresponding to the threshold voltage value of 4.7V is taken as the first charging current value.
And if the voltage value of the output end of the collected reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, determining a first charging current value according to the threshold voltage value of the lowest level after the current threshold voltage value is equal to the threshold voltage value of the lowest level.
Specifically, when the threshold voltage value is adjusted to the lowest threshold voltage value, the input current of the reverse cut-off unit is adjusted to a preset smaller current value, such as 300mA, then the current value is gradually increased, such as 100mA, the current value after each increase is input to the reverse cut-off unit, the voltage value output by the reverse cut-off unit is collected in real time, the collected voltage value is compared with the threshold voltage value of the lowest level, if the collected voltage value is greater than the threshold voltage value of the lowest level, the increased current value is used as a first charging current value, and the current value is continuously increased gradually; if the collected voltage value is smaller than or equal to the threshold voltage value of the lowest level, the current value of the previous stage of the current value after the increase is used as the first charging current value, for example, the current value after the increase is 1100mA, the current value of the previous stage of the current value after the increase is 1000mA, and 1000mA is used as the first charging current value.
For ease of understanding, a complete embodiment is described below.
For example, the threshold voltage values have 5 levels in total, namely, the highest level threshold voltage value, the second level threshold voltage value, the third level threshold voltage value, the fourth level threshold voltage value and the lowest level threshold voltage value. The method comprises the steps of firstly comparing a collected voltage value of an output end of a reverse cut-off unit with a threshold voltage value of a highest level, adjusting the level of the threshold voltage value to a threshold voltage value of a second level if the collected voltage value of the output end of the reverse cut-off unit is smaller than the threshold voltage value of the highest level, then comparing the collected voltage value of the output end of the reverse cut-off unit with the threshold voltage value of the second level, if the collected voltage value of the output end of the reverse cut-off unit is large as a result of each comparison, adjusting the threshold voltage value to the lowest level, then adjusting the current value of the input end of the reverse cut-off unit to a preset current value, collecting the voltage value of the output end of the reverse cut-off unit in real time, increasing the current value of the input end of the reverse cut-off unit step by step when the collected voltage value is smaller than or equal to the threshold voltage value of the lowest level, and stopping increasing the current value of the input end of the reverse cut-off unit at the previous stage as a first charging current value.
It should be noted that, in general, the voltage at the input end of the charging chip will not reach the preset threshold voltage value of the lowest level, because the voltage drop on the path will increase with the increase of the current while the current is stepped up, the voltage reaching the charging chip will also decrease gradually, so that the voltage difference between the input voltage of the charging chip and the battery will decrease, and if the voltage difference is too small, the adjustable charging current will not be supported, so that the current will not increase any more, and finally the input voltage of the charging chip will not decrease any more, and will basically maintain the equilibrium state near the maximum input power point. Therefore, if the threshold voltage value is directly set to the lowest level of threshold voltage value, for the case of larger voltage drop charging caused by non-standard charger and non-standard data line and other influencing factors, especially for the high-voltage battery type, the voltage difference between the input voltage of the charging chip and the battery will be further reduced when the battery is just fully charged, and there is a risk of being unable to fully charged, so that the threshold voltage value is preferably adjusted step by step, and the fault tolerance capability is better for various charging scenes.
The charging circuit provided by the embodiment of the invention can also comprise at least one charging chip which does not correspond to the reverse cut-off unit besides the at least one reverse cut-off unit and the charging chip which corresponds to the reverse cut-off unit.
For example, the parallel charging circuit can comprise a main charging chip and an auxiliary charging chip, wherein the main charging chip can not correspond to the reverse cut-off unit, a device with a reverse cut-off function exists in the main charging chip, the auxiliary charging chip corresponds to the reverse cut-off unit, and a device with a reverse cut-off function does not exist in the auxiliary charging chip, so that the size of the auxiliary charging chip can be reduced, and the occupied area of the auxiliary charging chip on a PCB (printed circuit board) can be saved.
The auxiliary charging chip corresponds to the reverse cut-off unit, can be compatible with the auxiliary charging chip of the internal MOS-tube-free control circuit, and can prevent the power adapter from receiving more than 5V voltage when the input end outputs more than 5V voltage under the abnormal condition of the auxiliary charging chip, thereby playing a role in protecting the power adapter.
Specifically, the input end of the charging chip which is not corresponding to the reverse cut-off unit is connected with the power supply, the output end of the charging chip which is not corresponding to the reverse cut-off unit is used as the output end of the charging circuit and is connected with the anode of the battery to be charged, and the charging circuit is used for conducting a passage between the input end and the output end of the charging chip which is not corresponding to the reverse cut-off unit when the voltage value of the input end of the charging chip which is not corresponding to the reverse cut-off unit is larger than a preset voltage value, and charging is carried out by using the current corresponding to the sum of the first charging current value and the preset second charging current value.
The charging chips included in the charging circuit are all for charging the battery, so the charging current value should be the sum of the current values corresponding to each charging chip.
The second charging current preset here is preset according to a software configuration.
In order to facilitate understanding, embodiments of the present invention will be described below with reference to specific examples.
Fig. 4 is a schematic structural diagram of a parallel charging circuit according to the embodiment of the present invention. As can be seen from fig. 4, fig. 4 includes a main charging chip U2 and an auxiliary charging chip U3, where the main charging chip U2 supports a reverse cut-off path control function, U4 is an internal control unit of the main charging path, the auxiliary charging chip U3 does not support the reverse cut-off path control function, in order to prevent current backflow, an external reverse cut-off unit is used to perform reverse cut-off path control, U5 is an external reverse cut-off unit of the auxiliary charging path, and includes two parallel power diodes, in the charging circuit of fig. 4, U7 is a charging chip control signal, U8, U9, U10 and U11 are NMOS power diodes, and U6 is a battery module. Under normal conditions, when the charger is not inserted, the main charging chip U2 unit can realize the turn-off function of the VBUS power supply channel of the U1 unit through the U4 unit MOS tube switch, and the SW1 power supply current is prevented from reversely flowing to the input end through the U8 unit.
The above is merely an example of a specific structure of each unit in the charging circuit provided in the embodiment of the present invention, and the specific structure of each unit is not limited to the above structure provided in the embodiment of the present invention, but may be other structures known to those skilled in the art, and is not limited herein.
Based on the same inventive concept, the embodiment of the invention also provides a charging method of the charging circuit provided by the embodiment of the invention, as shown in fig. 5, comprising the following steps.
S501, when the voltage value of the output end of the reverse cut-off unit is smaller than a preset highest-level threshold voltage value, the highest-level threshold voltage value is downwards regulated by one level according to a preset differential pressure residual value;
S502, comparing the acquired voltage value of the output end of the reverse cut-off unit with the threshold voltage value after the step-down regulation, and determining a first charging current value according to a comparison result;
And S503, charging by using the current corresponding to the first charging current value.
According to the charging method based on the charging circuit provided by the embodiment of the invention, firstly, the voltage value output by the reverse cut-off unit is determined to be smaller than the preset highest-level threshold voltage value, the highest-level threshold voltage value is adjusted downwards by one level according to the preset differential pressure residual value, then the collected voltage value at the output end of the reverse cut-off unit is compared with the threshold voltage value after the one level is adjusted downwards, a first charging current value is determined according to the comparison result, and finally, the current corresponding to the first charging current value is used for charging. The voltage value output by the reverse cut-off unit is compared with the threshold voltage value, and the charging current during charging is determined according to the comparison result, so that the reverse cut-off unit outside the charging chip can be used for replacing the device with the reverse cut-off function inside the charging chip to realize the function of reverse cut-off current, the size of the charging chip can be reduced, and the occupied space of the charging chip on the PCB board is reduced.
It should be noted that the preset differential pressure residual value may be set according to the actual situation of the charging circuit, for example, 0.3V, which is not limited in the embodiment of the present invention.
In a specific implementation, the determining the first charging current value according to the comparison result includes:
if the acquired voltage value of the output end of the reverse cut-off unit is larger than or equal to the threshold voltage value after the step-down, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value;
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, continuing to downwards regulate the threshold voltage value after the down regulation by one level according to the residual pressure value until the collected voltage value of the output end of the reverse cut-off unit is larger than or equal to the current threshold voltage value after the down regulation, and taking a current value corresponding to the current threshold voltage value after the down regulation as a first charging current value; or (b)
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after being adjusted downwards, the adjusted-down threshold voltage value is continuously adjusted downwards by one level according to the differential pressure residual value, and if the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after being adjusted downwards each time, the first charging current value is determined according to the lowest-level threshold voltage value after the current threshold voltage value is equal to the lowest-level threshold voltage value.
In a specific implementation, the determining the first charging current value according to the lowest level threshold voltage value includes:
In the process that the current value of the input end of the reverse cut-off unit is gradually increased from a preset current value, if the acquired voltage value of the output end of the reverse cut-off unit is larger than the lowest threshold voltage value, taking the increased current value as the first charging current value, and continuously gradually increasing the current value of the input end of the reverse cut-off unit;
And if the acquired voltage value of the output end of the reverse cut-off unit is smaller than or equal to the lowest threshold voltage value, taking the current value of the previous stage of the current value after the increase as the first charging current value, and stopping increasing the current value of the input end of the reverse cut-off unit step by step.
In particular implementations, the method further includes:
And if the voltage value of the output end of the reverse cut-off unit is larger than or equal to the threshold voltage value of the highest level, taking the current value corresponding to the threshold voltage value of the highest level as a charging current value.
In particular implementations, the method further includes:
When the voltage value of the input end of the charging chip which is not corresponding to the reverse cut-off unit is larger than the preset voltage value, a passage between the input end and the output end of the charging chip which is not corresponding to the reverse cut-off unit is conducted, and the charging is conducted by using the current corresponding to the sum of the first charging current value and the preset second charging current value.
Fig. 6 is a complete flowchart of a charging method according to an embodiment of the present invention.
S601, detecting a VBUS input level state;
S602, judging whether the VBUS input level state is a high level, if so, executing S603, otherwise, executing S604;
S603, detecting whether the voltage of the input end of the charging chip is larger than or equal to the highest-level threshold voltage value, if so, executing S605, otherwise, executing S606;
s604, identifying a non-charging mode, and reversing the cut-off current;
S605, charging by using a current value corresponding to the highest level threshold voltage value;
S606, using a preset differential pressure residual value to downwards adjust the threshold voltage value of the highest level by one level;
S607, detecting whether the voltage of the input end of the charging chip is larger than or equal to a threshold voltage value after one level of down regulation, if so, executing S608, otherwise, executing S609;
s608, charging by using a current value corresponding to a threshold voltage value of a previous stage of the threshold voltage value after the step-down;
S609, detecting whether the threshold voltage value after the one-stage down regulation is the threshold voltage value of the lowest level, if so, executing S610, otherwise, executing S606;
S610, adjusting a current value of an input end of a reverse cut-off unit corresponding to the charging chip to a preset current value;
s611, increasing the current value of the input end of the reverse cut-off unit step by step;
S612, judging whether the voltage value of the input end of the charging chip is smaller than or equal to the lowest threshold voltage value, if so, executing S613, otherwise, executing S611;
s613, a current value of a stage preceding the current value of the input terminal of the current reverse cut-off unit is set as a charging current value.
Based on the same inventive concept, the embodiment of the invention also provides an electronic device, which comprises the detection and identification circuit provided by the embodiment of the invention. The principle of the electronic device for solving the problem is similar to that of the detection and identification circuit, so that the implementation of the electronic device can be referred to the implementation of the detection and identification circuit, and the repetition is omitted here.
In specific implementation, the electronic device may be: a mobile terminal. Such as a cell phone, tablet computer. Of course, the electronic device may be any product or component having the function of storing and/or transmitting data, such as a mobile storage device, a digital camera, a video camera, a printer, etc. Other essential components of the electronic device will be understood by those skilled in the art, and are not described herein in detail, nor should they be considered as limiting the invention.
According to the charging circuit, the charging method and the electronic equipment provided by the embodiment of the invention, the input end of the reverse cut-off unit is connected with the power supply, the output end of the reverse cut-off unit is connected with the voltage input end of the charging chip, when the voltage value of the input end of the direction cut-off unit is larger than or equal to the preset voltage value, the passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit is conducted, and when the voltage value of the input end of the reverse cut-off unit is smaller than the voltage value of the output end of the reverse cut-off unit, the passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit is disconnected, wherein the charging chip is the charging chip corresponding to the reverse cut-off unit; and the charging chip is used for collecting the voltage value output by the reverse cut-off unit in real time, when the voltage value output by the reverse cut-off unit is smaller than the threshold voltage value of the highest level, the threshold voltage value of the highest level is downwards regulated by one level according to the preset differential pressure residual value, the collected voltage value of the output end of the reverse cut-off unit is compared with the current threshold voltage value after being downwards regulated, a first current value is determined according to the comparison result, and the first current value is used for charging. Because the charging circuit in the embodiment of the invention comprises the reverse cut-off unit and the charging chip corresponding to the reverse cut-off unit, the reverse cut-off unit can prevent current from flowing from the battery to the power supply, so that components with reverse cut-off function can be canceled in the charging chip, the size of the chip can be reduced, and the space occupied by the charging chip on the PCB board can be reduced.
The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the present application may be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Still further, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of the present application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. A charging circuit, comprising: at least one reverse cut-off unit and a charging chip corresponding to the reverse cut-off unit;
The input end of the reverse cut-off unit is connected with a power supply, the output end of the reverse cut-off unit is connected with the voltage input end of the charging chip, and the power supply is used for switching on a passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit when the voltage value of the input end of the reverse cut-off unit is larger than or equal to a preset voltage value, and switching off the passage between the input end of the reverse cut-off unit and the output end of the reverse cut-off unit when the voltage value of the input end of the reverse cut-off unit is smaller than the voltage value of the output end of the reverse cut-off unit; the charging chip is corresponding to the reverse cut-off unit;
The charging chip corresponding to the reverse cut-off unit is used for collecting the voltage value of the output end of the reverse cut-off unit in real time; when the voltage value of the output end of the reverse cut-off unit is smaller than the threshold voltage value of the highest level, the threshold voltage value of the highest level is downwards regulated by one level according to a preset differential pressure residual value, the collected voltage value of the output end of the reverse cut-off unit is compared with the current threshold voltage value after being downwards regulated, a first charging current value is determined according to a comparison result, and the current corresponding to the first charging current value is used for charging;
The charging chip is specifically configured to, when determining the first charging current value according to the comparison result:
if the acquired voltage value of the output end of the reverse cut-off unit is larger than or equal to the current threshold voltage value after the down regulation, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value; or (b)
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, continuing to downwards regulate the current threshold voltage value after the down regulation by one level according to the residual pressure value until the collected voltage value of the output end of the reverse cut-off unit is larger than or equal to the current threshold voltage value after the down regulation, and taking a current value corresponding to the current threshold voltage value after the down regulation as a first charging current value; or (b)
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after the down-regulation, continuing to down-regulate the current threshold voltage value after the down-regulation by one level according to the differential pressure residual value, and if the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after each down-regulation, determining a first charging current value according to the threshold voltage value of the lowest level after the current threshold voltage value is equal to the threshold voltage value of the lowest level;
the charging chip is specifically used for:
After the current threshold voltage value is equal to the lowest threshold voltage value, adjusting the current value of the input end of the reverse cut-off unit to a preset current value, and increasing step by step;
In the process that the current value of the input end of the reverse cut-off unit is gradually increased from a preset current value, if the acquired voltage value of the output end of the reverse cut-off unit is larger than the threshold voltage value of the lowest level, taking the increased current value as the first charging current value, and continuously gradually increasing the current value of the input end of the reverse cut-off unit;
And if the acquired voltage value of the output end of the reverse cut-off unit is smaller than or equal to the threshold voltage value of the lowest level, taking the current value of the previous stage of the current value after the increase as the first charging current value, and stopping increasing the current value of the input end of the reverse cut-off unit step by step.
2. The charging circuit of claim 1, wherein the charging chip is further to:
And if the voltage value of the output end of the reverse cut-off unit is larger than or equal to the threshold voltage value of the highest level, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value.
3. The charging circuit according to claim 1 or 2, further comprising at least one charging chip that does not correspond to the reverse cut-off unit;
The input end of the charging chip which is not corresponding to the reverse cut-off unit is connected with the power supply, the output end of the charging chip which is not corresponding to the reverse cut-off unit is used as the output end of the charging circuit, and the charging circuit is used for conducting a passage between the input end and the output end of the charging chip which is not corresponding to the reverse cut-off unit when the voltage value of the input end of the charging chip which is not corresponding to the reverse cut-off unit is larger than the preset voltage value, and charging by using the current corresponding to the sum of the first charging current value and the preset second charging current value.
4. The charging circuit of claim 1, wherein the reverse cut-off unit comprises at least one power diode.
5. The charging circuit of claim 4, wherein if the reverse cut-off unit comprises a plurality of power diodes, the plurality of power diodes are connected in parallel.
6. A charging method based on the charging circuit according to any one of claims 1 to 5, characterized in that the method comprises:
when the voltage value of the output end of the reverse cut-off unit is smaller than a preset highest-level threshold voltage value, the highest-level threshold voltage value is downwards regulated by one stage according to a preset differential pressure residual value;
Comparing the acquired voltage value of the output end of the reverse cut-off unit with the threshold voltage value after the step-down, and determining a first charging current value according to a comparison result;
charging by using a current corresponding to the first charging current value;
wherein, the determining the first charging current value according to the comparison result includes:
if the acquired voltage value of the output end of the reverse cut-off unit is larger than or equal to the threshold voltage value after the step-down, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value;
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, continuing to downwards regulate the threshold voltage value after the down regulation by one level according to the residual pressure value until the collected voltage value of the output end of the reverse cut-off unit is larger than or equal to the current threshold voltage value after the down regulation, and taking a current value corresponding to the current threshold voltage value after the down regulation as a first charging current value; or (b)
If the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after the down regulation, continuing to down regulate the threshold voltage value after the down regulation by one level according to the differential pressure residual value, and if the collected voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after each down regulation, determining the first charging current value according to the threshold voltage value of the lowest level after the current threshold voltage value is equal to the threshold voltage value of the lowest level;
the determining the first charging current value according to the lowest level threshold voltage value includes:
After the current threshold voltage value is equal to the lowest threshold voltage value, adjusting the current value of the input end of the reverse cut-off unit to a preset current value, and increasing step by step;
In the process that the current value of the input end of the reverse cut-off unit is gradually increased from a preset current value, if the acquired voltage value of the output end of the reverse cut-off unit is larger than the threshold voltage value of the lowest level, taking the increased current value as the first charging current value, and continuously gradually increasing the current value of the input end of the reverse cut-off unit;
And if the acquired voltage value of the output end of the reverse cut-off unit is smaller than or equal to the threshold voltage value of the lowest level, taking the current value of the previous stage of the current value after the increase as the first charging current value, and stopping increasing the current value of the input end of the reverse cut-off unit step by step.
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