CN113824167A - Charging circuit and charging method - Google Patents
Charging circuit and charging method Download PDFInfo
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- CN113824167A CN113824167A CN202010568953.3A CN202010568953A CN113824167A CN 113824167 A CN113824167 A CN 113824167A CN 202010568953 A CN202010568953 A CN 202010568953A CN 113824167 A CN113824167 A CN 113824167A
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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
Abstract
The invention discloses a charging circuit and a charging method, which comprise 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 corresponding to the reverse cut-off unit is used for acquiring the voltage value output by the reverse cut-off unit in real time, comparing the acquired voltage value at 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. Because the reverse cut-off unit in the charging circuit can replace the components and parts with the reverse cut-off function in the charging chip, the size of the chip can be reduced, and the space occupied by the charging chip on the PCB board is reduced.
Description
Technical Field
The present invention relates to the field of charging technologies, and in particular, to a charging circuit and a charging method.
Background
With the rapid development of smart phones, the charging speed and temperature rise experience are paid much attention to users. The traditional single charging scheme cannot meet higher charging requirements of users, the design cost is increased by an emerging low-voltage direct charging or flash charging scheme, and the design cost and the charging speed are taken into consideration by a parallel charging scheme, so that the charging scheme with the best cost performance is formed at present.
The design of parallel charging includes that the chip is filled with the main chip and the chip is filled to the assistance, when using the parallel charging mode to charge, fills the chip unified control whole route of charging through the main, and partial electric current fills the chip flow direction to the battery by the main chip of filling, and some electric current fills the chip flow direction to the assistance by the main chip of filling in addition, then fills the chip flow direction to the battery through the assistance.
The charging chip used at present is large in size, and occupies a large space on a PCB.
Disclosure of Invention
The invention provides a charging circuit and a charging method, which are used for solving the problems that the size of a charging chip is large and the occupied space on a PCB (printed circuit board) is large 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 charging circuit comprises a reverse cut-off unit, a charging chip, a power supply and a reverse cut-off unit, wherein 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, and the reverse cut-off unit is used for switching on a path 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 path 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 acquiring 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 adjusted down by one level according to a preset differential pressure margin 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 adjusted down, a first charging current value is determined according to the comparison result, and the current corresponding to the first charging current value is used for charging.
Optionally, in the embodiment of the present invention, the charging chip is specifically configured to, when the first charging current value is determined according to the comparison result:
if the acquired voltage value of the output end of the reverse cut-off unit is greater than or equal to the current threshold voltage value after being adjusted downwards, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value; or
If the acquired 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 current threshold voltage value after being adjusted downwards continues to be adjusted downwards by one step according to the voltage difference residual value until 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 being adjusted downwards, and a current value corresponding to the current threshold voltage value after being adjusted downwards is used as a first charging current value; or
If the acquired 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 current threshold voltage value after being adjusted downwards continues to be adjusted downwards by one level according to the voltage difference margin value, and if the acquired 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, a first charging current value is determined 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 greater than the lowest threshold voltage value, taking the increased current value as the first charging current value, and continuously increasing the current value of the input end of the reverse cut-off unit step by step;
and if the acquired voltage value of the output end of the reverse cut-off unit is less than or equal to the lowest threshold voltage value, taking the previous-stage current value of the increased current value 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 greater 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 the charging current value.
Optionally, the charging device further comprises at least one charging chip not corresponding to the reverse cut-off unit;
the input end of the charging chip which does not correspond to the reverse cut-off unit is connected with the power supply, the output end of the charging chip which does not correspond 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 path between the input end and the output end of the charging chip which does not correspond to the reverse cut-off unit when the voltage value of the input end of the charging chip which does not correspond to the reverse cut-off unit is greater than the preset voltage value, and charging is conducted by using the current corresponding to the sum of the first charging current value and the preset second charging current value.
Optionally, the reverse blocking unit includes at least one power diode.
Optionally, if the reverse blocking 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 for a charging circuit, including:
when the voltage value of the output end of the reverse cut-off unit is smaller than the preset threshold voltage value of the highest grade, the threshold voltage value of the highest grade is adjusted down by one grade according to the preset differential pressure margin value;
comparing the acquired voltage value of the output end of the reverse cut-off unit with the threshold voltage value after the voltage value is adjusted down one stage, and determining a first charging current value according to the 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 greater than or equal to the threshold voltage value after the step is reduced one level, taking a current value corresponding to the threshold voltage value of the highest level as a first charging current value;
if the acquired 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 threshold voltage value after being adjusted downwards continues to be adjusted downwards by one step according to the voltage difference residual value until 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 being adjusted downwards, and a current value corresponding to the current threshold voltage value after being adjusted downwards is used as a first charging current value; or
If the acquired voltage value of the output end of the reverse cut-off unit is smaller than the threshold voltage value after being adjusted downwards, the threshold voltage value after being adjusted downwards continues to be adjusted downwards by one step according to the voltage difference margin value, and if the acquired 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 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 threshold voltage value of the lowest level 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 greater than the lowest threshold voltage value, taking the increased current value as the first charging current value, and continuously increasing the current value of the input end of the reverse cut-off unit step by step;
and if the acquired voltage value of the output end of the reverse cut-off unit is less than or equal to the lowest threshold voltage value, taking the previous-stage current value of the increased current value 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 includes:
and if the voltage value of the output end of the reverse cut-off unit is greater 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 includes:
and when the voltage value of the input end of the charging chip not corresponding to the reverse cut-off unit is greater than the preset voltage value, switching on a path between the input end and the output end of the charging chip not corresponding to the reverse cut-off unit, and charging by using the current corresponding to the sum of the first charging current value and the preset second charging current value.
In 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, and the charging chip is used for conducting a path 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 greater than or equal to a preset voltage value, and disconnecting the path 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 a charging chip corresponding to the reverse cut-off unit; and the charging chip is used for acquiring the voltage value output by the reverse cut-off unit in real time, reducing the threshold voltage value of the highest level by one level according to a preset voltage difference margin value when the voltage value output by the reverse cut-off unit is smaller than the threshold voltage value of the highest level, comparing the acquired voltage value of the output end of the reverse cut-off unit with the reduced current threshold voltage value, determining a first current value according to the comparison result, and charging by using the first current value. 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, and the reverse cut-off unit can prevent current from flowing from the battery to the power supply, so that components with the reverse cut-off function can be cancelled 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 in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a charging circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a reverse blocking unit composed of a diode according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a reverse blocking unit including two diodes connected in parallel according to an embodiment of the present invention;
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 flowchart of a charging method of a charging circuit according to an embodiment of the present 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 objects, technical solutions and advantages of the present invention clearer, specific embodiments of a charging circuit and a charging method based on the charging circuit provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments described below are only for illustrating and explaining the present invention and are not to be used for limiting the present invention. And the embodiments and features of the embodiments in the present application may be combined with each other without conflict. It should be noted that the shapes of the various figures in the drawings are not to scale and are intended to illustrate the invention. And the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.
The present invention provides a charging circuit, as shown in fig. 1, which may include: at least one reverse cut-off unit 10 and a charging chip 11 corresponding to the reverse cut-off 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 the reverse cut-off unit is used for switching on a path 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 greater than or equal to a preset voltage value, and switching off the path 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; the charging chip 11 is a charging chip corresponding to the reverse cut-off unit 10;
the charging chip 11 is corresponding to the reverse cut-off unit 10 and is used for acquiring a 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 adjusted down by one level according to a preset differential pressure margin value, the collected voltage value of the output end of the reverse cut-off unit is compared with the current threshold voltage value after the voltage value is adjusted down, a first charging current value is determined according to the comparison result, and the current corresponding to the first charging current value is used for charging.
In the charging circuit provided in the embodiment of the present invention, an input end of the reverse blocking unit is connected to the power supply, an output end of the reverse blocking unit is connected to a voltage input end of the charging chip, and the charging chip is configured to turn on a path between the input end of the reverse blocking unit and the output end of the reverse blocking unit when a voltage value of the input end of the reverse blocking unit is greater than or equal to a preset voltage value, and turn off the path between the input end of the reverse blocking unit and the output end of the reverse blocking unit when the voltage value of the input end of the reverse blocking unit is less than the voltage value of the output end of the reverse blocking unit, where the charging chip is a charging chip corresponding to the reverse blocking unit; and the charging chip is used for acquiring the voltage value output by the reverse cut-off unit in real time, reducing the threshold voltage value of the highest level by one level according to a preset voltage difference margin value when the voltage value output by the reverse cut-off unit is smaller than the threshold voltage value of the highest level, comparing the acquired voltage value of the output end of the reverse cut-off unit with the reduced current threshold voltage value, determining a first current value according to the comparison result, and charging by using the first current value. 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, and the reverse cut-off unit can prevent current from flowing from the battery to the power supply, so that components with the reverse cut-off function can be cancelled 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 in the embodiment of the invention not only can be compatible with a charging chip without an MOS (metal oxide semiconductor) tube control circuit inside, but also can prevent the power adapter from receiving the voltage of more than 5V when the input end outputs the voltage of more than 5V under the abnormal condition of the charging chip, thereby playing the role of protecting the power adapter.
In a specific implementation, the reverse blocking unit 10 may include at least one power diode, as shown in fig. 2, which may be a low-impedance, high-current power diode. The diode may block a current from flowing from the cathode of the diode to the anode of the diode when a voltage value of the cathode of the diode is greater than a voltage value of the anode of the diode. The low-impedance and high-current power diode is used, so that the voltage drop during charging is lower, and the efficiency is higher.
Fig. 2 shows a structural diagram of a reverse blocking unit composed of one diode, in order to reduce the impedance of the charging path and further reduce the voltage drop of the charging path under the condition of constant charging current, the reverse blocking unit may include a plurality of diodes connected in parallel, as shown in fig. 3, which is a structural diagram of a reverse blocking unit including two diodes connected in parallel.
The threshold voltage value in the embodiment of the present invention is briefly described below. In the embodiment of the present invention, threshold voltage values of multiple levels, for example, threshold voltage values of 5 levels are respectively a threshold of a highest level, a threshold voltage value of a second level, a threshold voltage value of a third level, a threshold voltage value of a fourth level, and a threshold voltage value of a minimum level. 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 threshold voltage value of the highest level is 5V, and the corresponding current value is 3A.
In implementation, after receiving the current output by the reverse cut-off unit, the charging chip compares the currently acquired voltage value output by the reverse cut-off unit with the highest-level threshold voltage value, and if the currently acquired voltage value output by the reverse cut-off unit is greater than or equal to the highest-level threshold voltage value, the current value corresponding to the highest-level threshold voltage value is used as a first charging current value; if the currently acquired 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 adjusted down by one level according to a preset voltage difference margin value, then the acquired voltage value of the output end of the reverse cut-off unit is compared with the adjusted current threshold voltage value, a first charging current value is determined according to the 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 acquired 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 current threshold voltage value is adjusted downwards, the current value corresponding to the threshold voltage value of the highest level is used as the first charging current value.
For example, if the acquired 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, and the current threshold voltage value after one level is adjusted down is 4.8V, the acquired voltage value of the output end of the reverse cut-off unit 4.9V is greater than the current threshold voltage value after one level is adjusted down by 4.8V, and the current value 3A corresponding to the threshold voltage value of the highest level 5V is used as the first charging current value.
And secondly, if the acquired voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after being adjusted downwards, continuously adjusting the current threshold voltage value after being adjusted downwards by one step according to the residual value of the pressure difference until 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 being adjusted downwards, and taking the current value corresponding to the current threshold voltage value after being adjusted downwards as the first charging current value.
For example, the acquired voltage value of the output end of the reverse cut-off unit is 4.8V, the threshold voltage value of the highest level is 5V, the current threshold voltage value after being adjusted down by one level is 4.85V, the acquired voltage value of the output end of the reverse cut-off unit 4.8V is smaller than the current threshold voltage value after being adjusted down by one level, the threshold voltage value is continuously adjusted down by one level to 4.7V, then the acquired voltage value of the output end of the reverse cut-off unit 4.75V is larger than 4.7V, and the current value corresponding to the threshold voltage value of 4.7V is used as the first charging current value.
And if the acquired voltage value of the output end of the reverse cut-off unit is smaller than the current threshold voltage value after being adjusted downwards, continuing to adjust the current threshold voltage value after being adjusted downwards by one level according to the residual value of the pressure difference, and if the acquired 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, 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 increased step by step, such as 100mA, the current value increased each time is input into 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, and if the collected voltage value is larger than the threshold voltage value of the lowest level, the increased current value is used as the first charging current value, and the current value is continuously increased step by step; if the collected voltage value is less than or equal to the threshold voltage value of the lowest level, the previous-stage current value of the increased current value is taken as the first charging current value, for example, the increased current value is 1100mA, and the previous-stage current value of the increased current value is 1000mA, and then 1000mA is taken as the first charging current value.
For ease of understanding, the following description is given in terms of a complete embodiment.
For example, the threshold voltage values have 5 levels in total, which are 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. Firstly, comparing the acquired voltage value of the output end of the reverse cut-off unit with the threshold voltage value of the highest grade, if the acquired voltage value of the output end of the reverse cut-off unit is less than the threshold voltage value of the highest grade, adjusting the grade of the threshold voltage value to the threshold voltage value of the second grade, then comparing the acquired voltage value of the output end of the reverse cut-off unit with the threshold voltage value of the second grade, if the acquired voltage value of the output end of the reverse cut-off unit is large as the result of each comparison, adjusting the threshold voltage value to the lowest grade, then adjusting the current value of the input end of the reverse cut-off unit to a preset current value without adjusting the threshold voltage value, acquiring the voltage value of the output end of the reverse cut-off unit in real time, and increasing the current value of the input end of the reverse cut-off unit step by step when the acquired voltage value is greater than the voltage value of the threshold of the lowest grade, and when the collected voltage value is less than or equal to the threshold voltage value of the lowest level, stopping increasing the current value of the input end of the reverse cut-off unit, and taking the previous-level current value of the current value of the input end of the reverse cut-off unit as a first charging current value.
It should be noted that, in general, the voltage at the input end of the charging chip does not reach the threshold voltage value of the preset lowest level, because the voltage drop on the path increases with the increase of the current while the current is stepped up, and the voltage reaching the charging chip also gradually decreases, so the voltage difference between the input voltage of the charging chip and the battery becomes smaller, and if the voltage difference is too small, the adjustable charging current cannot be supported, so the current does not become larger, and finally the input voltage of the charging chip does not become smaller, and the input voltage of the charging chip can be basically maintained in a balanced state near the maximum input power point. Therefore, if the threshold voltage value is directly set as the lowest level threshold voltage value, for the charging condition with larger voltage drop caused by the nonstandard charger, the nonstandard data line and other influence factors, especially for the high-voltage battery type, when the charging is about to be fully charged, the voltage difference between the input voltage of the charging chip and the battery is further reduced, and the risk of being incapable of being fully charged exists, so that the threshold voltage value is preferably adjusted step by step, and the fault-tolerant capability is better for various charging scenes.
The charging circuit provided by the embodiment of the invention may further include at least one charging chip not corresponding to the reverse blocking unit, in addition to the at least one reverse blocking unit and the charging chip corresponding to the reverse blocking unit.
For example, the parallel charging circuit may include a main charging chip and an auxiliary charging chip, wherein the main charging chip may not correspond to the reverse blocking unit, a device having a reverse blocking function may be present inside the main charging chip, the auxiliary charging chip may correspond to the reverse blocking unit, and a device having a reverse blocking function may not be present inside the auxiliary charging chip, so that the size of the auxiliary charging chip may be reduced, and the area occupied by the auxiliary charging chip on the PCB board may be saved.
The auxiliary charging chip corresponds to the reverse cut-off unit, and can be compatible with the auxiliary charging chip without an MOS (metal oxide semiconductor) tube control circuit inside, and can prevent the power adapter from receiving the voltage more than 5V when the input end outputs the voltage more than 5V under the abnormal condition of the auxiliary charging chip, thereby playing the role of protecting the power adapter.
Specifically, the input end of the charging chip not corresponding to the reverse cut-off unit is connected with the power supply, the output end of the charging chip not corresponding to the reverse cut-off unit is used as the output end of the charging circuit, is connected with the anode of the battery to be charged, and is used for conducting a path between the input end and the output end of the charging chip not corresponding to the reverse cut-off unit when the voltage value of the input end of the charging chip not corresponding to the reverse cut-off unit is greater than the preset voltage value, and charging is carried out by using the sum of the first charging current value and the preset second charging current value.
It should be noted that the charging chips included in the charging circuit are all used to charge the battery, and therefore the charging current value should be the sum of the current values corresponding to each charging chip.
The preset second charging current is preset according to a software configuration.
For the sake of easy understanding, the following description will be made of specific examples of the present invention.
Fig. 4 is a schematic structural diagram of a parallel charging circuit according to an 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 blocking path control function, U4 is a main charging path internal control unit, the auxiliary charging chip U3 does not support the reverse blocking path control function, in order to prevent current backflow, an external reverse blocking unit is used for reverse blocking path control, U5 is an auxiliary charging path external reverse blocking unit, which includes two power diodes connected in parallel, in the charging circuit of fig. 4, U7 is a charging chip control signal, U8, U9, U35 10 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 path of the U1 unit through the U4 unit MOS tube switch, and prevent the SW1 power supply current from flowing back to the input end through the U8 unit.
The above is merely to illustrate the specific structure of each unit in the charging circuit provided in the embodiment of the present invention, and in the implementation, the specific structure of each unit is not limited to the above structure provided in the embodiment of the present invention, and may be other structures known to those skilled in the art, and is not limited herein.
Based on the same inventive concept, an embodiment of the present invention further provides a charging method based on the charging circuit provided by the embodiment of the present invention, as shown in fig. 5, including the following steps.
S501, when the voltage value of the output end of the reverse cut-off unit is smaller than the preset highest-level threshold voltage value, reducing the highest-level threshold voltage value by one level according to the preset differential pressure margin value;
s502, comparing the acquired voltage value of the output end of the reverse cut-off unit with the threshold voltage value after one stage of reduction, and determining a first charging current value according to the 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 threshold voltage value of the highest level, the threshold voltage value of the highest level is adjusted down by one level according to the preset voltage difference margin value, then, the collected voltage value of the output end of the reverse cut-off unit is compared with the threshold voltage value adjusted down by one level, 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 inside the charging chip and having the reverse cut-off function to realize the function of cutting off the current reversely, 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 voltage difference margin value may be set according to the actual condition of the charging circuit, for example, 0.3V, and the voltage difference margin value 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 greater than or equal to the threshold voltage value after the step is reduced one level, taking a current value corresponding to the threshold voltage value of the highest level as a first charging current value;
if the acquired 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 threshold voltage value after being adjusted downwards continues to be adjusted downwards by one step according to the voltage difference residual value until 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 being adjusted downwards, and a current value corresponding to the current threshold voltage value after being adjusted downwards is used as a first charging current value; or
If the acquired 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 threshold voltage value after being adjusted downwards continues to be adjusted downwards by one step according to the voltage difference margin value, and if the acquired 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 threshold voltage value of the lowest level after the current threshold voltage value is equal to the threshold voltage value of the lowest level.
In a specific implementation, the determining the first charging current value according to the threshold voltage value of the lowest level 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 greater than the lowest threshold voltage value, taking the increased current value as the first charging current value, and continuously increasing the current value of the input end of the reverse cut-off unit step by step;
and if the acquired voltage value of the output end of the reverse cut-off unit is less than or equal to the lowest threshold voltage value, taking the previous-stage current value of the increased current value 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 implementation, the method further comprises:
and if the voltage value of the output end of the reverse cut-off unit is greater 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 the charging current value.
In particular implementation, the method further comprises:
and when the voltage value of the input end of the charging chip not corresponding to the reverse cut-off unit is greater than the preset voltage value, switching on a path between the input end and the output end of the charging chip not corresponding to the reverse cut-off unit, and charging 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 greater than or equal to the threshold voltage value of the highest level, if so, executing S605, otherwise, executing S606;
s604, identifying the charging mode as a non-charging mode, and reversely stopping the reverse flow of current;
s605, charging by using a current value corresponding to the threshold voltage value of the highest level;
s606, reducing the threshold voltage value of the highest grade by one grade by using a preset differential pressure margin value;
s607, detecting whether the voltage of the input end of the charging chip is more than or equal to the threshold voltage value after one-stage reduction, if so, executing S608, otherwise, executing S609;
s608, charging by using a current value corresponding to an upper threshold voltage value of the threshold voltage value after one level of reduction;
s609, detecting whether the threshold voltage value after the first level is adjusted downwards is the threshold voltage value of the lowest level, if so, executing S610, otherwise, executing S606;
s610, adjusting the current value of the input end of the 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 less than or equal to the lowest threshold voltage value, if so, executing S613, otherwise, executing S611;
and S613, taking the current value of the previous stage of the current value of the current input end of the current reverse cut-off unit as the charging current value.
Based on the same inventive concept, the embodiment of the invention also provides electronic equipment which comprises the detection 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 the implementation of the electronic device can refer to the implementation of the detection and identification circuit, and repeated parts are not described herein again.
In specific implementation, the electronic device may be: a mobile terminal. Such as a cell phone, tablet computer. Of course, the electronic device may also be any product or component having a function of storing and/or transmitting data, such as a mobile storage device, a digital camera, a video camera, a printer, and the like. Other essential components of the electronic device are understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention.
In the charging circuit, the charging method, and the electronic device provided in the embodiments of the present invention, an input end of a reverse blocking unit is connected to a power supply, an output end of the reverse blocking unit is connected to a voltage input end of a charging chip, a path between the input end of the reverse blocking unit and the output end of the reverse blocking unit is turned on when a voltage value of the input end of the direction blocking unit is greater than or equal to a preset voltage value, and the path between the input end of the reverse blocking unit and the output end of the reverse blocking unit is turned off when the voltage value of the input end of the reverse blocking unit is less than the voltage value of the output end of the reverse blocking unit, where the charging chip is a charging chip corresponding to the reverse blocking unit; and the charging chip is used for acquiring the voltage value output by the reverse cut-off unit in real time, reducing the threshold voltage value of the highest level by one level according to a preset voltage difference margin value when the voltage value output by the reverse cut-off unit is smaller than the threshold voltage value of the highest level, comparing the acquired voltage value of the output end of the reverse cut-off unit with the reduced current threshold voltage value, determining a first current value according to the comparison result, and charging by using the first current value. 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, and the reverse cut-off unit can prevent current from flowing from the battery to the power supply, so that components with the reverse cut-off function can be cancelled 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 illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, 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 subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, 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 this 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A charging circuit, comprising: at least one reverse cut-off unit and a charging chip corresponding to the reverse cut-off unit;
the charging circuit comprises a reverse cut-off unit, a charging chip, a power supply and a reverse cut-off unit, wherein 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, and the reverse cut-off unit is used for switching on a path 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 path 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 acquiring 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 adjusted down by one level according to a preset differential pressure margin 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 adjusted down, a first charging current value is determined according to the comparison result, and the current corresponding to the first charging current value is used for charging.
2. The charging circuit of claim 1, wherein the charging chip is specifically configured to, when determining the first charging current value based on the comparison result:
if the acquired voltage value of the output end of the reverse cut-off unit is greater than or equal to the current threshold voltage value after being adjusted downwards, taking the current value corresponding to the threshold voltage value of the highest level as a first charging current value; or
If the acquired 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 current threshold voltage value after being adjusted downwards continues to be adjusted downwards by one step according to the voltage difference residual value until 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 being adjusted downwards, and a current value corresponding to the current threshold voltage value after being adjusted downwards is used as a first charging current value; or
If the acquired 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 current threshold voltage value after being adjusted downwards continues to be adjusted downwards by one level according to the voltage difference margin value, and if the acquired 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, a first charging current value is determined 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.
3. The charging circuit of claim 2, wherein 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 greater than the lowest threshold voltage value, taking the increased current value as the first charging current value, and continuously increasing the current value of the input end of the reverse cut-off unit step by step;
and if the acquired voltage value of the output end of the reverse cut-off unit is less than or equal to the lowest threshold voltage value, taking the previous-stage current value of the increased current value 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.
4. 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 greater 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.
5. The charging circuit according to any one of claims 1 to 4, further comprising at least one charging chip not corresponding to the reverse blocking unit;
the input end of the charging chip which does not correspond to the reverse cut-off unit is connected with the power supply, the output end of the charging chip which does not correspond 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 path between the input end and the output end of the charging chip which does not correspond to the reverse cut-off unit when the voltage value of the input end of the charging chip which does not correspond to the reverse cut-off unit is greater than the preset voltage value, and charging is conducted by using the current corresponding to the sum of the first charging current value and the preset second charging current value.
6. The charging circuit of claim 1, wherein the reverse blocking unit comprises at least one power diode.
7. The charging circuit of claim 6, wherein if the reverse blocking unit includes a plurality of power diodes, the plurality of power diodes are connected in parallel.
8. A charging method based on the charging circuit of any one of claims 1 to 7, the method comprising:
when the voltage value of the output end of the reverse cut-off unit is smaller than the preset threshold voltage value of the highest grade, the threshold voltage value of the highest grade is adjusted down by one grade according to the preset differential pressure margin value;
comparing the acquired voltage value of the output end of the reverse cut-off unit with the threshold voltage value after the voltage value is adjusted down one stage, and determining a first charging current value according to the comparison result;
and charging by using the current corresponding to the first charging current value.
9. The method of claim 8, wherein determining the first charging current value based on the comparison comprises:
if the acquired voltage value of the output end of the reverse cut-off unit is greater than or equal to the threshold voltage value after the step is reduced one level, taking a current value corresponding to the threshold voltage value of the highest level as a first charging current value;
if the acquired 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 threshold voltage value after being adjusted downwards continues to be adjusted downwards by one step according to the voltage difference residual value until 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 being adjusted downwards, and a current value corresponding to the current threshold voltage value after being adjusted downwards is used as a first charging current value; or
If the acquired 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 threshold voltage value after being adjusted downwards continues to be adjusted downwards by one step according to the voltage difference margin value, and if the acquired 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 threshold voltage value of the lowest level after the current threshold voltage value is equal to the threshold voltage value of the lowest level.
10. The method of claim 8, wherein said determining said first charging current value based on said lowest ranked threshold voltage value comprises:
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 greater than the lowest threshold voltage value, taking the increased current value as the first charging current value, and continuously increasing the current value of the input end of the reverse cut-off unit step by step;
and if the acquired voltage value of the output end of the reverse cut-off unit is less than or equal to the lowest threshold voltage value, taking the previous-stage current value of the increased current value 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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