CN115912578A - Charging circuit, system, portable electronic device and system - Google Patents
Charging circuit, system, portable electronic device and system Download PDFInfo
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- CN115912578A CN115912578A CN202310005320.5A CN202310005320A CN115912578A CN 115912578 A CN115912578 A CN 115912578A CN 202310005320 A CN202310005320 A CN 202310005320A CN 115912578 A CN115912578 A CN 115912578A
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- 238000007600 charging Methods 0.000 title claims abstract description 396
- 238000007599 discharging Methods 0.000 claims abstract description 42
- 238000010277 constant-current charging Methods 0.000 claims abstract description 14
- 230000001276 controlling effect Effects 0.000 claims description 15
- 238000010280 constant potential charging Methods 0.000 claims description 14
- 238000004891 communication Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000005669 field effect Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000001960 triggered effect Effects 0.000 description 2
- 101100329776 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) CUR1 gene Proteins 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00036—Charger exchanging data with battery
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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
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The embodiment of the invention provides a charging circuit, a system, portable electronic equipment and a system, wherein the charging circuit comprises a power supply node, a system node, a battery node, a voltage limiting module, a first charging path, a second charging path, a control module and a charging and discharging path, the first charging path supplies power to the system node and the battery node, and the second charging path is connected with the first charging path in parallel; when the voltage of the battery node is in a constant-current charging voltage range of the battery, the control module controls the second charging path to be conducted, and the voltage limiting module controls the first charging path to be cut off, so that the voltage of the power supply node is loaded to the battery node through the second charging path and the charging and discharging path; the resistance of the second charging path is less than the resistance of the first charging path. The charging circuit provided by the embodiment of the invention can improve the charging efficiency and reduce the cost.
Description
Technical Field
The invention relates to the technical field of charging, in particular to a charging circuit, a charging system, portable electronic equipment and a charging system.
Background
The portable electronic system includes a portable electronic device (e.g., a TWS headset) and a portable charging device (e.g., a charging cradle that houses the TWS headset). Since the portable electronic device is small in size, the size of the charging circuit thereof is limited.
In one known technique, a portable electronic device has two independent charging chips (ICs): the chip that directly fills of heavy current and the chip that charges of undercurrent, main control chip directly fills chip and the chip that charges through two pin control respectively: when the battery of the portable electronic equipment enters a constant current charging stage, the main control chip controls the direct charging chip to work and the charging chip to be closed, and the portable charging equipment charges the battery of the portable electronic equipment through the direct charging chip by large current (constant current); when the battery of the portable electronic equipment is in the pre-charging and constant-voltage charging stage, the main control chip controls the direct charging chip to be closed and the charging chip to work, and the portable charging equipment charges the battery of the portable electronic equipment through the charging chip by small current. Generally, the charging chip with small current comprises a power supply node, a system node, a battery node, a comparison module, a voltage limiting module, a state module, a charging and discharging control module, a charging path connecting the power supply node and the system node, and a charging and discharging path connecting the system node and the battery node; the power supply node is used for being electrically connected with the portable charging equipment; the charging path is used for the power supply node to supply power to the system node and the battery node; the comparison module is used for judging the voltage between the power supply node and the battery node, and when the power supply node is larger than the battery node, the charging chip is controlled to enter a charging state, and other modules are triggered to perform related work; the state module is used for controlling enabling and detecting in the whole charging process, and comprises the steps of judging the relation between the voltage of a power supply node and threshold voltage and upper limit voltage, and outputting control signals of corresponding states under different voltage states; the voltage limiting module can turn off the charging path when the power supply node voltage is less than a set threshold (e.g. 4.8V); the charge and discharge control module is used for detecting the current and voltage of the charge and discharge path, controlling the conduction and the cut-off of the charge and discharge path and controlling the conduction and the cut-off of the charge and discharge path according to whether the current and the voltage of the charge and discharge path exceed limit values or not.
In the above-mentioned known technology, the portable electronic device needs two independent chips to complete the large-current constant-current charging and the small-current charging, so the charging circuit of the portable electronic device has a large volume and a high cost.
Disclosure of Invention
Based on the above situation, embodiments of the present invention provide a charging circuit, a charging system, a portable electronic device, and a charging system, so as to improve charging efficiency and reduce cost.
In order to achieve the above purpose, the related embodiments of the invention adopt the following technical solutions:
a charging circuit is used for charging a battery and comprises a power supply node, a system node, a battery node, a first charging path for connecting the power supply node and the system node, and a charging and discharging path for connecting the system node and the battery node. The charging circuit further comprises a voltage limiting module, and the first charging path is used for supplying power to the system node and the battery node. The charging circuit further comprises a control module and a second charging path which is connected with the power supply node and the system node and is connected with the first charging path in parallel. When the voltage of the battery node is in a constant-current charging voltage range of the battery, the control module controls the second charging path to be conducted, and the voltage limiting module controls the first charging path to be cut off, so that the voltage of the power supply node is loaded to the battery node through the second charging path and the charging and discharging path. The resistance of the second charging path is less than the resistance of the first charging path.
A portable electronic device comprising any of the charging circuits.
A charging system comprises a charging circuit and a power supply circuit. The charging circuit is used for charging a battery and comprises a power supply node, a system node, a battery node, a first charging path and a charging and discharging path, wherein the first charging path is connected with the power supply node and the system node, and the charging and discharging path is connected with the system node and the battery node. The charging circuit further comprises a voltage limiting module, a control module and a second charging path which is connected with the power supply node and the system node and is connected with the first charging path in parallel, wherein the first charging path is used for supplying power to the system node and the battery node. When the voltage of the battery node is in a constant-current charging voltage range of the battery, the control module controls the second charging path to be conducted, and the voltage limiting module controls the first charging path to be cut off, so that the voltage of the power supply node is loaded to the battery node through the second charging path and the charging and discharging path. The resistance of the second charging path is less than the resistance of the first charging path. The power supply circuit is used for providing power for a power supply node of the charging circuit and comprises a power supply communication module and a voltage regulating module. The power supply communication module is used for periodically acquiring the real-time voltage of the battery. The voltage regulating module controls the voltage provided to the power source node to be the real-time voltage plus a preset voltage value when the real-time voltage is in the constant-current charging voltage interval of the battery.
A portable electronic system comprising any of the charging systems described herein.
Since the resistance of the second charging path is smaller than that of the first charging path, under the condition that the voltage provided by the power supply node is constant, the current passing through the second charging path in the embodiment is larger than the current passing through the first charging path, and therefore, the charging speed of the embodiment is higher. On the other hand, under the condition that the magnitude of the charging current is the same, the voltage difference of the second charging path is smaller than that when the first charging path is used for charging, and the charging efficiency is higher; and the second charging path is used for realizing large-current charging of the battery in a constant-current charging voltage interval, so that the circuit is simpler, and the cost is lower.
Other advantages of the present invention will be described in the detailed description, and those skilled in the art will understand the technical features and technical solutions presented in the description.
Drawings
Embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:
fig. 1 is a schematic diagram of a charging circuit according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a charging circuit according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a charging circuit according to a third embodiment of the present invention;
FIG. 4 is a schematic diagram of a charging circuit according to a fourth embodiment of the present invention;
fig. 5 is a schematic diagram of a charging circuit according to a fifth embodiment of the invention;
FIG. 6 is a schematic diagram of a charging circuit according to a sixth embodiment of the present invention;
FIG. 7 is a schematic diagram of a charging circuit according to a seventh embodiment of the invention;
fig. 8 is a schematic diagram of a charging system according to an eighth embodiment of the present invention;
fig. 9 is a schematic diagram of a charging system according to a ninth embodiment of the present invention.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the nature of the present invention, well-known methods, procedures, and components have not been described in detail.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
Fig. 1 is a charging circuit according to an embodiment of the present invention, which may be disposed in an electronic device for charging a battery VBAT of the electronic device, and the electronic device may be powered by the charging device. The electronic device and the charging device may be a portable electronic device and a portable charging device, respectively, such as a bluetooth headset and a charging cradle, or a bluetooth bracelet and a charger, etc.
The charging circuit comprises a power supply node VBUS 140, a system node VSYS 150, a battery node VBAT 160, a first charging path 111, a voltage limiting module 112, a charging and discharging path 113, a second charging path 120 and a control module 130; the system node 150 is a power supply terminal of the subsequent circuit, for example, a main control circuit (e.g., a BLE main control circuit) of the subsequent circuit; the first charging path 111 connects the power node 140 and the system node 150, and the power node 140 can supply power to the system node 150 through the first charging path 111; the charge and discharge path 113 connects the system node 150 and the battery node 160; the power supply node 140 may supply power to the battery node 160 via the first charging path 111 and the charging and discharging path 113. The second charging path 120 connects the power node 140 and the system node 150, and the second charging path 120 is connected in parallel with the first charging path 111, and the resistance of the second charging path 120 is smaller than that of the first charging path 111. The voltage limiting module 112 is used for controlling the first charging path 111 to be turned off and turned on, and the control module 130 is used for controlling the second charging path 120 to be turned off and turned on.
Generally, the charging interval of the battery may include the following intervals according to the voltage of the battery: a pre-charge interval (e.g., less than a threshold voltage, where the threshold voltage may be 3V), a constant current charge interval (e.g., between the threshold voltage and an upper limit voltage, where the threshold voltage and the upper limit voltage may be 3V and 4.2V, respectively), and a constant voltage charge interval (e.g., greater than the upper limit voltage), where the constant current charge interval may be charged with a relatively large current. In this embodiment, when the voltage of the battery node 160 is in the constant current charging voltage range of the battery, the control module 130 controls the second charging path 120 to be turned on, and the voltage limiting module 112 controls the first charging path 111 to be turned off, so that the voltage of the power node 140 is loaded to the battery node 160 through the second charging path 120 and the charging and discharging path 113, and thus, the power node 140 provides the charging current to the battery node 160 through the second charging path 120 and the charging and discharging path 113; in addition, the power node 140 also provides voltage and current to the system node 150. Since the resistance of the second charging path 120 is smaller than that of the first charging path 111, under the condition that the voltage provided by the power node 140 is constant, the current passing through the second charging path 120 in this embodiment is larger than the current passing through the first charging path 111 alone for charging, and therefore, the charging speed in this embodiment is faster; for example, in some embodiments, the second charging path 120 is susceptible to large currents above 200mA, such as above 250mA, and even 400-600mA. On the other hand, in the case where the magnitude of the charging current is the same, the voltage difference of the second charging path 120 in the present embodiment is smaller than that in the case of charging only using the first charging path 111, and the charging efficiency is higher; for example, in some embodiments, where the second charge path 120 passes around 128mA, the second charge path 120 has only about a 10mV voltage differential, while where only the first charge path 111 is used to pass around 128mA, the first charge path 111 has about a 48 mV voltage differential; as another example, in some embodiments, the total voltage difference between the second charge circuit and the charge-discharge path 113 is only about 60mV for the case where the second charge path 120 passes around 128 mA.
As shown in fig. 2, the second charging path 120 may include only one transistor, for example, a field effect transistor such as a P-channel field effect transistor or an N-channel field effect transistor. In the embodiment, since only one transistor is used to implement the second charging path 120, the circuit structure is simpler, the size is smaller, and the cost is lower, which makes the scheme especially suitable for being applied in portable electronic devices, such as TWS headphones.
As shown in fig. 3, the first charging path 111 may include only one transistor, for example, a field effect transistor such as a P-channel field effect transistor or an N-channel field effect transistor. As shown in fig. 4, the first charging path 111 may have two transistors, for example, two fets arranged back to back, such as two N- channel fets 111a and 111b arranged back to back.
As shown in fig. 5, the charge/discharge path 113 may include only one transistor, for example, a field effect transistor, such as a P-channel field effect transistor or an N-channel field effect transistor, to control the on/off of the current flowing into or out of the battery node 160.
As shown in fig. 6, in another embodiment, the charging circuit includes a charging chip 110, the first charging path 111, the charging/discharging path 113 and the voltage limiting module 112 are located inside the charging chip 110, and the second charging path 120 is located outside the charging chip 110, as mentioned above, the second charging path 120 may include only one transistor, such as a fet. In this embodiment, since the first charging path 111 in the charging chip 110 does not need to pass a large current, and the impedance of the first charging path 111 may be large, the first charging path 111 does not need to be provided with a power device with a larger area, so that the volume of the charging chip 110 may be reduced, and the cost is saved; and the second charging path 120 outside the charging chip 110, for example, the second charging path 120 formed by only one transistor flows a large current, so that the implementation is simpler and the cost is lower. In some embodiments, the charging circuit of the present embodiment may be formed by using the existing charging chip 110 and a single transistor, so that large current charging may be implemented at lower cost. In this embodiment, the control module 130 may be a main control module outside the charging chip 110 in the electronic device, or may be a status module in the charging chip 110. In this embodiment, the charging chip 110 may further include a known comparison module for determining a voltage between the power node and the battery node, and when the power node is greater than the battery node, the charging chip is controlled to enter a charging state, and the remaining modules are triggered to perform related operations, and a charging and discharging control module for detecting a current and a voltage of the charging and discharging path, controlling the conduction and the cut-off of the charging and discharging path, and controlling the conduction and the cut-off of the charging and discharging path according to whether the current and the voltage of the charging and discharging path exceed a limit value.
As shown in fig. 7, in another embodiment, the second charging path 120 may be integrated in the charging chip 110, and the control module 130 may also be integrated in the charging chip 110, and in this embodiment, the control module 130 may be a status module of the charging chip 110.
The resistance of the first charging path 111 may be 7 to 14 times, e.g., any integer multiple of 7-14 times, the resistance of the second charging path 120. The resistance of the second charging path 120 may be between 25 milli-ohms and 50 milli-ohms, such as any integer of 25-50 milli-ohms, and the resistance of the first charging path 111 may be between 250 milli-ohms and 350 milli-ohms, such as any integer of 250-350 milli-ohms.
In another embodiment, when the voltage of the battery node 160 is in the constant voltage charging voltage range of the battery, the voltage limiting module 112 can further control the first charging path 111 to be turned on, and the control module 130 controls the second charging path 120 to be turned off, so that the voltage of the power node 140 is applied to the battery node 160 through the first charging path 111 and the charging and discharging path 113, and thus, the power node 140 provides the charging current to the battery node 160 through the first charging path 111 and the charging and discharging path 113. Because the charging current in the constant voltage charging voltage interval is relatively small, the charging method is suitable for being realized by the charging chip 110 which is good at controlling small current and stopping charging with high precision; in addition, the larger resistance of the first charging path 111 can also satisfy the charging efficiency and the heat dissipation requirement.
In another embodiment, when the voltage of the battery node 160 is in the pre-charge voltage range of the battery, the voltage limiting module 112 is further configured to control the first charging path 111 to be turned on, and the control module 130 controls the second charging path 120 to be turned off, so that the voltage of the power node 140 is applied to the battery node 160 through the first charging path 111 and the charging and discharging path 113, and thus, the power node 140 provides the charging current to the battery node 160 through the first charging path 111 and the charging and discharging path 113. Because the charging current in the pre-charging voltage interval is relatively small, the charging chip 110 which is used for controlling small current and stopping charging with high precision is suitable for realizing; in addition, the larger resistance of the first charging path 111 can also satisfy the charging efficiency and the heat dissipation requirement.
Fig. 8 shows a charging system according to an embodiment of the present invention, which includes a charging circuit 100 and a power supply circuit 200; the charging circuit 100 may be disposed in an electronic device (e.g., a portable electronic device) for charging a battery in the electronic device; the power supply circuit 200 may be disposed in a charging device (e.g., a portable charging device). The charging circuit 100 includes a power node 140, a system node 150, a battery node 160, a first charging path 111 connecting the power node 140 and the system node 150, a charging/discharging path 113, a voltage limiting module 112, a control module 130, and a second charging path 120; the system node 150 is a power supply terminal of the subsequent circuit, for example, as a main control circuit of the subsequent circuit; the first charging path 111 connects the power node 140 and the system node 150, and the power node 140 can supply power to the system node 150 through the first charging path 111; the charge and discharge path 113 connects the system node 150 and the battery node 160; the power supply node 140 may supply power to the battery node 160 via the first charging path 111 and the charging and discharging path 113. The second charging path 120 connects the power node 140 and the system node 150, the second charging path 120 is connected in parallel with the first charging path 111, and the resistance of the second charging path 120 is smaller than that of the first charging path 111. The voltage limiting module 112 is used for controlling the on/off of the first charging path 111, and the control module 130 is used for controlling the on/off of the second charging path 120.
The power supply circuit 200 is used for providing power to the power node 140 of the charging circuit 100, and the power supply circuit 200 includes a power supply output node 230, a power supply communication module 210, and a voltage regulating module 220 (e.g., a voltage reducing module, a voltage boosting module, or a voltage reduction-voltage boosting module); the power supply communication module 210 is configured to periodically obtain a real-time voltage of the battery, for example, the charging circuit 100 periodically detects the voltage of the battery in real time, so as to obtain the real-time voltage of the battery, and the charging circuit 100 sends the real-time voltage to the power supply circuit 200 through a set communication manner (for example, a wired or wireless manner), so that the power supply circuit 200 can periodically obtain the real-time voltage of the battery; the voltage regulating module 220 controls the voltage provided to the power node 140 to be the real-time voltage of the battery plus a predetermined voltage value OFFSET _ VOL1, such as 60mV, when the real-time voltage is in the constant current charging voltage interval of the battery. In one embodiment, in order to adjust the voltage of the power node 140 less frequently, in the constant-current charging voltage interval, if the current charging current is smaller than the difference between the preset constant current value ICC _ SET and the predetermined current OFFSET amplitude OFFSET _ CUR1, or the voltage difference between the power node 140 and the battery node 160 is smaller than the preset voltage threshold value OFFSET _ VOL2 (where OFFSET _ VOL2 is smaller than OFFSET _ VOL 1), the voltage adjusting module 220 updates and adjusts the voltage of the power node 140 to the real-time voltage of the battery plus a predetermined voltage value, and after the voltage of the power node 140 is maintained for a period of time, when the above condition is satisfied, the next adjustment is performed until the battery enters the constant-voltage charging voltage interval. By properly setting the above parameters, the voltage regulation module 220 can regulate the voltage once every predetermined step voltage amplitude (e.g., 10mV or 25 mV).
In this embodiment, when the voltage of the battery node 160 is in the constant current charging voltage range of the battery, the control module 130 controls the second charging path 120 to be turned on, and the voltage limiting module 112 controls the first charging path 111 to be turned off, so that the voltage of the power node 140 is loaded to the battery node 160 through the second charging path 120 and the charging and discharging path 113, and thus, the power node 140 provides the charging current to the battery node 160 through the second charging path 120 and the charging and discharging path 113; in addition, the power node 140 also provides voltage and current to the system node 150. Since the resistance of the second charging path 120 is smaller than that of the first charging path 111, under the condition that the voltage provided by the power node 140 is constant, the current passing through the second charging path 120 in the present embodiment is larger than the current passing through the first charging path 111 alone, and therefore, the charging speed of the present embodiment is faster. On the other hand, in the case where the magnitude of the charging current is the same, the voltage difference of the second charging path 120 in the present embodiment is smaller than that in the case of charging using only the first charging path 111, and the charging efficiency is higher. And the power supply circuit 200 maintains the current through the second charging path 120 constant or substantially constant by adding a predetermined voltage value to the real-time voltage by the voltage provided to the power supply node 140.
In another embodiment, as shown in fig. 9, the charging circuit 100 further includes a charging communication module 170; the power supply output node 230 is electrically connected to the power supply node 140; the charging communication module 170 is configured to transmit the real-time voltage of the battery to the power supply communication module 210 through the power supply node 140 and the power supply output node 230. When the electronic device is connected to the charging device for charging, an electrical connection is formed between the power supply output node 230 and the power node 140, and the electrical connection is used for both the charging energy flowing from the power supply circuit 200 to the charging circuit 100 and the real-time voltage of the battery sent from the charging circuit 100 to the power supply circuit 200, so that the power supply circuit 200 provides a corresponding voltage to the power supply output node 230 according to the real-time voltage, that is, provides a corresponding voltage to the power node 140.
In another embodiment, after the real-time voltage of the battery reaches the upper limit voltage and the charging circuit 100 detects the real-time voltage and sends the real-time voltage to the power supply circuit 200, the power supply circuit 200 may recognize that the real-time voltage is in a constant voltage charging voltage interval of the battery, and in the constant voltage charging voltage interval: the voltage regulating module 220 provides a voltage (e.g., an upper limit voltage plus a predetermined voltage value) of a constant voltage charging voltage value to the power node 140; the voltage limiting module 112 is further configured to control the first charging path 111 to be turned on, and the control module 130 controls the second charging path 120 to be turned off, so that the voltage of the power node 140 is loaded to the battery node 160 through the first charging path 111 and the charging/discharging path 113. When the charging circuit 100 detects that the charging current is smaller than a certain current threshold (e.g. may be 0.3 times of the preset constant current value ICC _ SET), the charging circuit 100 sends the current charging current to the power supply circuit 200, and the voltage regulating module 220 of the power supply circuit 200 adjusts the voltage of the power node 140 up to another constant voltage charging voltage value, for example, 4.8V. When the charging circuit 100 detects that the charging current is less than a certain current lower limit (for example, may be 0.1 times of the preset constant current value ICC _ SET), the charging and discharging control module 130 controls the charging and discharging path 113 to be turned off, so that the charging of the battery may be stopped, and the first charging path 111 may remain on to continue to provide power to the system node 150. Since the charging current in the constant voltage charging voltage interval is relatively small, the charging chip 110 is suitable for controlling small current and stopping charging with high precision, and the larger resistance of the first charging path 111 can also meet the requirements of charging efficiency and heat dissipation. The power supply circuit 200 maintains the battery in a constant voltage charging interval by supplying a voltage having a constant voltage charging value to the power node 140.
In another embodiment, after the charging circuit 100 detects the real-time voltage of the battery and sends the real-time voltage to the power supply circuit 200 when the real-time voltage of the battery is less than the threshold voltage, the power supply circuit 200 may recognize that the real-time voltage is in the pre-charge voltage interval of the battery, and during the pre-charge voltage interval of the battery: the voltage regulator module 220 provides a voltage of a pre-charge voltage value (e.g., 4.8V) to the power node 140; the voltage limiting module 112 is further configured to control the first charging path 111 to be turned on, and the control module 130 controls the second charging path 120 to be turned off, so that the voltage of the power node 140 is applied to the battery node 160 through the first charging path 111 and the charging/discharging path 113, thereby pre-charging the battery. Since the charging current in the pre-charging voltage interval is relatively small, the charging chip 110 is suitable for controlling small current and stopping charging with high precision, and in addition, the larger resistance of the first charging path 111 can also meet the requirements of charging efficiency and heat dissipation. The power supply circuit 200 maintains the battery in the pre-charge voltage interval by providing a voltage of the pre-charge voltage value to the power node 140.
The charging circuit 100 in the charging system may adopt the charging circuit in the embodiment associated with any one of fig. 1 to 7; for example, the second charging path 120 of the charging circuit 100 in the charging system may include only one transistor, for example, a field effect transistor, such as a P-channel field effect transistor or an N-channel field effect transistor; as another example, the resistance of the first charging path 111 may be 7 to 14 times the resistance of the second charging path 120; for another example, the charging circuit 100 includes a charging chip 110, the first charging path 111, the charging/discharging path 113 and the voltage limiting module 112 are located inside the charging chip 110, the second charging path 120 is located outside the charging chip 110, and so on, which are not listed herein.
It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.
Claims (16)
1. A charging circuit is used for charging a battery, and comprises a power supply node, a system node, a battery node, a first charging path for connecting the power supply node and the system node, and a charging and discharging path for connecting the system node and the battery node, and further comprises a voltage limiting module, wherein the first charging path is used for supplying power to the system node and the battery node, and the charging circuit is characterized in that: the charging circuit also comprises a control module and a second charging path which is connected with the power supply node and the system node and is connected with the first charging path in parallel; when the voltage of the battery node is in a constant-current charging voltage range of the battery, the control module controls the second charging path to be conducted, and the voltage limiting module controls the first charging path to be cut off, so that the voltage of the power supply node is loaded to the battery node through the second charging path and the charging and discharging path; the resistance of the second charging path is less than the resistance of the first charging path.
2. The charging circuit of claim 1, wherein the resistance of the first charging path is 7 to 14 times greater than the resistance of the second charging path.
3. The charging circuit of claim 2, wherein the resistance of the second charging path is between 25 milliohms and 50 milliohms.
4. The charging circuit of claim 1, wherein the second charging path comprises only one transistor.
5. The charging circuit of claim 1, wherein when the voltage of the battery node is within a constant voltage charging voltage range of the battery, the voltage limiting module is further configured to control the first charging path to be turned on, and the control module controls the second charging path to be turned off, so that the voltage of the power node is applied to the battery node through the first charging path and the charging/discharging path.
6. The charging circuit of claim 1, wherein when the voltage of the battery node is within a pre-charge voltage range of the battery, the voltage limiting module is further configured to control the first charging path to be turned on, and the control module controls the second charging path to be turned off, so that the voltage of the power node is applied to the battery node through the first charging path and the charging/discharging path.
7. The charging circuit of claim 1 or 4,
the first charging path, the charging and discharging path and the voltage limiting module are positioned in the charging chip, and the second charging path is positioned outside the charging chip.
8. A portable electronic device, characterized in that it comprises a charging circuit according to any one of claims 1 to 7.
9. A charging system comprises a charging circuit and a power supply circuit, and is characterized in that:
the charging circuit is used for charging a battery, and comprises a power supply node, a system node, a battery node, a first charging path connected with the power supply node and the system node, a charging and discharging path connected with the system node and the battery node, a voltage limiting module, a control module and a second charging path connected with the power supply node and the system node and connected with the first charging path in parallel, wherein the first charging path is used for supplying power to the system node and the battery node; when the voltage of the battery node is in a constant-current charging voltage range of the battery, the control module controls the second charging path to be conducted, and the voltage limiting module controls the first charging path to be cut off, so that the voltage of the power supply node is loaded to the battery node through the second charging path and the charging and discharging path; the resistance of the second charging path is smaller than that of the first charging path;
the power supply circuit is used for providing power for a power supply node of the charging circuit and comprises a power supply communication module and a voltage regulating module; the power supply communication module is used for periodically acquiring the real-time voltage of the battery; the voltage regulating module controls the voltage provided to the power source node to be the real-time voltage plus a preset voltage value when the real-time voltage is in the constant-current charging voltage interval of the battery.
10. The charging system of claim 9, wherein:
the resistance of the first charging path is 7 to 14 times the resistance of the second charging path.
11. The charging system of claim 9, wherein:
the second charging path includes only one transistor.
12. The charging system of claim 9, wherein:
the first charging path, the charging and discharging path and the voltage limiting module are positioned in the charging chip, and the second charging path is positioned outside the charging chip.
13. The charging system of claim 9, wherein: when the real-time voltage is in the pre-charge voltage interval of the battery:
the voltage regulating module provides a voltage with a pre-charging voltage value to the power supply node;
the voltage limiting module is further used for controlling the first charging path to be conducted, and the control module controls the second charging path to be closed, so that the voltage of the power supply node is loaded to the battery node through the first charging path and the charging and discharging path.
14. The charging system of claim 9, wherein: when the real-time voltage is in a constant voltage charging voltage interval of the battery:
the voltage regulating module provides voltage with a constant voltage charging voltage value to the power supply node;
the voltage limiting module is further used for controlling the first charging path to be conducted, and the control module controls the second charging path to be closed, so that the voltage of the power supply node is loaded to the battery node through the first charging path and the charging and discharging path.
15. The charging system of claim 9, wherein:
the power supply circuit comprises a power supply output node which is electrically connected with the power supply node;
the charging circuit further comprises a charging communication module, and the charging communication module is used for sending the real-time voltage of the battery to the power supply communication module through the power supply node and the power supply output node.
16. A portable electronic system, characterized in that it comprises a charging system according to any one of claims 9 to 15.
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| CN202310005320.5A CN115912578B (en) | 2023-01-04 | 2023-01-04 | Charging circuit, charging system, portable electronic device and portable electronic device system |
| CN202310817270.0A CN116865390A (en) | 2023-01-04 | 2023-01-04 | Charging circuit, portable electronic device and system |
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| US20140145504A1 (en) * | 2012-11-28 | 2014-05-29 | Renesas Electronics Corporation | Semiconductor integrated circuit and operation method of the same |
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| US20160087462A1 (en) * | 2014-09-19 | 2016-03-24 | Samsung Electronics Co., Ltd. | Charger circuit including a plurality of charging paths |
| CN111525646A (en) * | 2020-04-30 | 2020-08-11 | 深圳传音控股股份有限公司 | Charging circuit, method and device and electronic equipment |
| CN113949123A (en) * | 2021-10-09 | 2022-01-18 | 展讯通信（深圳）有限公司 | Electronic device and charging control method |
| CN113991762A (en) * | 2020-07-27 | 2022-01-28 | 华为技术有限公司 | Charging device, electronic device, charging system and charging method |
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| CN113242483B (en) * | 2020-01-23 | 2022-11-08 | 华为技术有限公司 | Charging control method, electronic device, charging box and electronic system |
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| US20140145504A1 (en) * | 2012-11-28 | 2014-05-29 | Renesas Electronics Corporation | Semiconductor integrated circuit and operation method of the same |
| CN105247755A (en) * | 2013-12-26 | 2016-01-13 | 联发科技股份有限公司 | Multipath charger and charging method thereof |
| US20160087462A1 (en) * | 2014-09-19 | 2016-03-24 | Samsung Electronics Co., Ltd. | Charger circuit including a plurality of charging paths |
| CN111525646A (en) * | 2020-04-30 | 2020-08-11 | 深圳传音控股股份有限公司 | Charging circuit, method and device and electronic equipment |
| CN113991762A (en) * | 2020-07-27 | 2022-01-28 | 华为技术有限公司 | Charging device, electronic device, charging system and charging method |
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| CN116865390A (en) | 2023-10-10 |
| CN115912578B (en) | 2023-07-28 |
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