CN211320982U - Charging and discharging circuit and electronic equipment - Google Patents
Charging and discharging circuit and electronic equipment Download PDFInfo
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- CN211320982U CN211320982U CN202020173256.3U CN202020173256U CN211320982U CN 211320982 U CN211320982 U CN 211320982U CN 202020173256 U CN202020173256 U CN 202020173256U CN 211320982 U CN211320982 U CN 211320982U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
The present disclosure provides a charge and discharge circuit and an electronic device. The charge and discharge circuit includes: the charging device comprises a charging input end, at least two batteries, a switching circuit, a current limiting circuit and a controller. Wherein, at least two batteries are connected with the charging input end; the switch circuit is connected between the at least two batteries; one end of the current limiting circuit is connected with at least one battery, and the other end of the current limiting circuit is connected with the charging input end; the controller is connected with the switching circuit and the current limiting circuit and is configured to: the switch circuit is controlled to enable the at least two batteries to form a series charging circuit or a parallel charging circuit, and the current limiting circuit is controlled to limit current of the at least one battery. This charging and discharging circuit can switch into series connection charging circuit and parallelly connected charging circuit to satisfy the different charging conditions, promote to charge and experience, not only guarantee charge efficiency, still reduce the charging power of charger. By controlling whether the current limiting circuit limits the current of at least one battery, the damage of the battery due to the overload of the charging current is avoided, and the service life of the charging and discharging circuit is prolonged.
Description
Technical Field
The present disclosure relates to the field of electronic devices, and in particular, to a charging and discharging circuit and an electronic device.
Background
The electronic equipment such as the mobile phone, the notebook computer and the like comprises a charging and discharging circuit, and the charging and discharging circuit is used for receiving electric energy input by the charger and outputting the electric energy to the electronic equipment. As the demand for the capacity and the rapid charging of the battery is higher, the charging and discharging circuit includes at least two batteries, and it is desirable that the at least two batteries form a series charging circuit to improve the charging efficiency. However, the series charging circuit does not easily reduce the charging power of the charger. Accordingly, it is important to provide a charging/discharging circuit capable of not only ensuring charging efficiency but also reducing charging power of a charger.
SUMMERY OF THE UTILITY MODEL
The present disclosure provides an improved charge and discharge circuit and an electronic device.
One aspect of the present disclosure provides a charge and discharge circuit, including:
a charging input terminal;
at least two batteries connected to the charging input;
a switching circuit connected between the at least two batteries;
one end of the current limiting circuit is connected with at least one battery, and the other end of the current limiting circuit is connected with the charging input end; and
a controller connected to the switching circuit and the current limiting circuit and configured to: controlling the switch circuit to enable the at least two batteries to form a series charging circuit or a parallel charging circuit, and controlling whether the current limiting circuit limits the current of at least one battery.
Optionally, the current limiting circuit includes a current limiting resistor connected to at least one of the batteries, and a current limiting switch connected in parallel to the current limiting resistor, where the current limiting switch is connected to the controller, and the controller is configured to control the current limiting switch to be turned off or turned on.
Optionally, the at least two batteries include a first battery and a second battery, and the charging input includes a first charging input and a second charging input;
the positive electrode of the first battery is connected with the first charging input end, the negative electrode of the first battery is connected with the positive electrode of the second battery through the switch circuit, and the negative electrode of the first battery is also connected with the second charging input end through the switch circuit;
the positive pole of the second battery is connected with the first charging input end through the switch circuit, and the negative pole of the second battery is connected with the second charging input end.
Optionally, the internal resistance of the first battery is smaller than the internal resistance of the second battery, and the current limiting circuit is connected between the negative electrode of the second battery and the second charging input terminal.
Optionally, the switching circuit comprises: a first switch connected between the negative electrode of the first battery and the positive electrode of the second battery;
the second switch is connected between the negative electrode of the first battery and the second charging input end; and
a third switch connected between the first charging input terminal and the anode of the second battery;
the controller is connected with the first switch, the second switch and the third switch, the first switch is turned on by controlling the second switch and the third switch to be turned off, so that the first battery and the second battery form a series charging circuit, and the controller controls the first switch to be turned off, the second switch and the third switch to be turned on, so that the first battery and the second battery form a parallel charging circuit.
Optionally, one end of the current limiting circuit is connected to the negative electrode of the second battery, the other end of the current limiting circuit is connected to a node with the second switch, and the node is connected to the second charging input terminal.
Optionally, the controller comprises: the first voltage detection port is connected with the first battery, and the controller detects first voltages at two ends of the first battery through the first voltage detection port; and
the second voltage detection port is connected with the second battery, and the controller detects second voltages at two ends of the second battery through the second voltage detection port;
the controller controls the switch circuit according to the first voltage and the second voltage, so that the first battery and the second battery form a series charging circuit or a parallel charging circuit.
Optionally, the charging and discharging circuit further includes: the discharge output end comprises a first discharge output end and a second discharge output end, the first discharge output end is connected with the anode of the first battery, and the second discharge output end is connected with the cathode of the first battery.
Optionally, the switching circuit comprises a power switching tube.
An aspect of the present disclosure provides an electronic device including the charge and discharge circuit of any one of the above-mentioned.
The charging and discharging circuit provided by the embodiment of the disclosure has at least the following beneficial effects:
when charging, make two at least batteries form series connection charging circuit through controller control switch circuit to promote charging efficiency, make two at least batteries form parallelly connected charging circuit, in order to reduce the charging power of charger, and series connection charging circuit and parallelly connected charging circuit are changeable, in order to satisfy different charging conditions, promote the experience of charging. The controller controls the current limiting circuit to limit current of at least one battery, so that damage of the battery due to overload of charging current is avoided, and the service life of the charging and discharging circuit is prolonged.
Drawings
FIG. 1 is a schematic diagram illustrating an electronic device according to an exemplary embodiment of the present disclosure;
FIG. 2 is a circuit diagram illustrating a charge and discharge circuit according to an exemplary embodiment of the present disclosure;
FIG. 3 illustrates an equivalent circuit diagram of a charge and discharge circuit shown in the present disclosure according to an exemplary embodiment;
FIG. 4 illustrates an equivalent circuit diagram of a charge and discharge circuit according to an exemplary embodiment of the present disclosure;
FIG. 5 illustrates an equivalent circuit diagram of a charge and discharge circuit shown in accordance with an exemplary embodiment of the present disclosure;
FIG. 6 illustrates an equivalent circuit diagram of a charge and discharge circuit shown in the present disclosure according to an exemplary embodiment;
fig. 7 is an equivalent circuit diagram of a charge and discharge circuit shown in the present disclosure according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. Unless otherwise indicated, the word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprises" or "comprising" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As used in this disclosure and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
As the charging time increases, the voltage of the battery increases and the charging current decreases. In some embodiments, the charging and discharging circuit of the electronic device includes a first battery and a second battery connected in series, and the first battery and the second battery connected in series are charged by a charger, so that quick charging can be realized. The voltage applied across the first battery and the second battery by the charger is the total voltage of the first battery and the second battery. In the later charging period, the charging power required by the first battery and the second battery is smaller, and in order to ensure the total voltage of the first battery and the second battery, the charger is still required to be charged with larger charging power, which is not beneficial to reducing the charging power of the charger.
In addition, during charging, the first battery and the second battery connected in series need to be in the same state, and independent control and real-time switching cannot be realized.
In order to solve the above problem, an embodiment of the present disclosure provides a charge and discharge circuit, including: the charging device comprises a charging input end, at least two batteries, a switching circuit, a current limiting circuit and a controller. Wherein at least two batteries are connected to the charging input. The switch circuit is connected between at least two batteries. One end of the current limiting circuit is connected with at least one battery, and the other end of the current limiting circuit is connected with the charging input end. The controller is connected with the switching circuit and the current limiting circuit and is configured to: the switch circuit is controlled to enable the at least two batteries to form a series charging circuit or a parallel charging circuit, and the current limiting circuit is controlled to limit current of the at least one battery.
The charging and discharging circuit that this disclosed embodiment provided, when charging, makes two at least batteries form series connection charging circuit through controller control switch circuit to promote charge efficiency, make two at least batteries form parallelly connected charging circuit, with the charging power who reduces the charger, and series connection charging circuit and parallelly connected charging circuit are changeable, with satisfy different charging conditions, promote the experience of charging. The controller controls the current limiting circuit to limit current of at least one battery, so that damage of the battery due to overload of charging current is avoided, and the service life of the charging and discharging circuit is prolonged.
The electronic device and the charging and discharging circuit provided by the embodiment of the disclosure are explained in detail below with reference to the accompanying drawings:
in embodiments of the present disclosure, electronic devices include, but are not limited to: smart devices such as mobile phones, tablet computers, ipads, digital broadcast terminals, messaging devices, game consoles, medical devices, fitness devices, personal digital assistants, and the like.
Fig. 1 is a schematic structural diagram of an electronic device according to an exemplary embodiment of the present disclosure. Referring to fig. 1, the electronic device includes: a body 100 and a charge/discharge circuit 200 provided in the body 100. Illustratively, the charging and discharging circuit 200 includes at least two batteries, and a circuit integrated with a protection circuit board connected to the at least two batteries.
Fig. 2 is a circuit diagram illustrating a charge and discharge circuit 200 according to an exemplary embodiment of the present disclosure. Referring to fig. 2, the charge and discharge circuit 200 includes: a charging input terminal IN, at least two batteries 210, a switching circuit 220, a current limiting circuit 230, a controller 240, and a discharging output terminal OUT.
At least two batteries 210 are connected to the charging input terminal IN for receiving the power inputted from the charger. Illustratively, the battery 210 includes a lithium ion battery 210. The at least two batteries 210 include at least two batteries 210 with different internal resistances and/or different capacities, so as to provide more design possibilities for the charging and discharging circuit 200, so as to expand the application range of the charging and discharging circuit 200.
The switching circuit 220 is connected between at least two batteries 210. Illustratively, the switching circuit 220 includes a power switch tube.
IN some embodiments, the at least two batteries 210 include a first battery BATT1 and a second battery BATT2, and the charging input IN includes a first charging input IN1 and a second charging input IN 2. The positive electrode of the first battery BATT1 is connected to the first charging input terminal IN1, the negative electrode is connected to the positive electrode of the second battery BATT2 through the switching circuit 220, and the negative electrode is also connected to the second charging input terminal IN2 through the switching circuit 220. The positive electrode of the second battery BATT2 is connected to the first charging input terminal IN1 through the switching circuit 220, and the negative electrode is connected to the second charging input terminal IN 2. IN some embodiments, by controlling the on/off state of the switch circuit 220, the negative electrode of the first battery BATT1 is connected to the positive electrode of the second battery BATT2, the positive electrode of the first battery BATT1 is connected to the first charging input terminal IN1, and the negative electrode of the second battery BATT2 is connected to the second charging input terminal IN2, that is, the first battery BATT1 and the second battery BATT2 form a series charging circuit. Alternatively, the positive pole of the first battery BATT1 may be connected to the first charge input terminal IN1, the negative pole to the second charge input terminal IN2, and the positive pole of the second battery BATT2 to the first charge input terminal IN1, the negative pole to the second charge input terminal IN2, i.e., the first battery BATT1 and the second battery BATT2 may form a parallel charging circuit.
For example, the first battery BATT1 and the second battery BATT2 may be integrated into a single body to facilitate assembly into the body 100 of the electronic device.
The current limiting circuit 230 has one end connected to at least one battery 210 and the other end connected to the charging input terminal IN. In some embodiments, the current limiting circuit 230 is introduced to prevent the battery 210 connected to the current limiting circuit 230 from being damaged due to overload of the charging current, so as to effectively protect the charging and discharging circuit 200.
The controller 240 is coupled to the switching circuit 220 and the current limiting circuit 230, and is configured to: the switching circuit 220 is controlled to form a series charging circuit or a parallel charging circuit for at least two batteries 210, and the current limiting circuit 230 is controlled to limit current to at least one battery 210. Illustratively, the controller 240 includes a control chip.
In some embodiments, the charge and discharge circuit includes a first battery and a second battery connected in series. When discharging, because the total voltage of the first battery and the second battery of establishing ties is higher than the voltage of electronic equipment, generally need set up the step-down circuit between charge and discharge circuit and electronic equipment to the electric energy step-down to the charge and discharge circuit output satisfies electronic equipment's power consumption demand. However, the voltage reduction circuit consumes part of the electric energy, which is not beneficial to improving the capacity utilization rate of the first battery and the second battery. In other embodiments, during discharging, the first battery and the second battery form a parallel circuit, both the first battery and the second battery need to be in the same state, independent control and real-time switching cannot be realized, the restriction between the first battery and the second battery is large, and the first battery and the second battery cannot be fully utilized.
In order to solve the above problem, in the embodiment of the present disclosure, the discharge output terminal OUT may include a first discharge output terminal OUT1 and a second discharge output terminal OUT2, the first discharge output terminal OUT1 is connected to the positive pole of the first battery BATT1, and the second discharge output terminal OUT2 is connected to the negative pole of the first battery BATT 1. In some embodiments, when the first battery BATT1 is connected in series with the second battery BATT2, the electronic device is powered only by the first battery BATT1, i.e., a single cell discharge circuit is formed. When the first battery BATT1 and the second battery BATT2 are connected in parallel, the electronic device is simultaneously powered by the first battery BATT1 and the second battery BATT2, that is, a parallel discharge circuit is formed. Compared with a series discharge circuit, the voltage reduction circuit is avoided, and the single cell discharge circuit and the parallel discharge circuit can be switched to meet different power consumption requirements of electronic equipment, so that the capacity utilization rate of the first battery BATT1 and the second battery BATT2 is improved.
Based on the above, during charging, the controller 240 controls the switch circuit 220 to enable the at least two batteries 210 to form a series charging circuit, so as to increase the charging speed, enable the at least two batteries 210 to form a parallel charging circuit, so as to reduce the charging power of the charger, and the series charging circuit and the parallel charging circuit are switchable to meet different charging conditions, thereby improving the charging experience. The controller 240 controls the current limiting circuit 230 to limit current to at least one battery 210, so as to prevent the battery 210 from being damaged due to overload of the charging current, and prolong the service life of the charging and discharging circuit 200. During discharging, the controller 240 controls the switch circuit 220 to form a switchable single cell discharge circuit and a switchable parallel discharge circuit, so that a voltage reduction circuit is not designed, the capacity utilization rate of the battery is improved, and different power consumption requirements of electronic equipment are met.
Fig. 3 to 7 are equivalent circuit diagrams of a charge and discharge circuit 200 according to different embodiments of the present disclosure. In order to more clearly understand the charge and discharge circuit 200 provided by the embodiment of the present disclosure, the operation principle of the charge and discharge circuit 200 provided by the embodiment of the present disclosure is described in more detail below with reference to fig. 2 to 7:
in some embodiments, with continued reference to fig. 2, the switching circuit 220 includes: the first switch K1 is connected between the negative electrode of the first battery BATT1 and the positive electrode of the second battery BATT 2. The second switch K2 is connected between the negative electrode of the first battery BATT1 and the second charging input terminal IN 2. The third switch K3 is connected between the first charging input terminal IN1 and the positive electrode of the second battery BATT 2. The controller 240 is connected to the first switch K1, the second switch K2, and the third switch K3, and controls the second switch K2 and the third switch K3 to be turned off, so that the first switch K1 is turned on, and the first battery BATT1 and the second battery BATT2 form a series charging circuit, as shown in fig. 3. The controller 240 controls the first switch K1 to be turned off, and the second switch K2 and the third switch K3 to be turned on, so that the first battery BATT1 and the second battery BATT2 form a parallel charging circuit, referring to fig. 4. In some embodiments, during charging, the controller 240 controls the switch circuit 220 to switch the first battery BATT1 and the second battery BATT2 to be a series charging circuit or a parallel charging circuit, so as to satisfy different charging conditions and improve the charging experience.
As the charging time is prolonged, the voltage across the battery 210 gradually increases, the charging current gradually decreases, the controller 240 may detect the first voltage V1 across the first battery BATT1 and the second voltage V2 across the second battery BATT2 in real time, and switch the series charging circuit and the parallel charging circuit based on the first voltage V1 and the second voltage V2, so as to fully utilize the electric energy output by the charger.
In some embodiments, the controller 240 includes: and a first voltage detection port connected to the first battery BATT1, wherein the controller 240 detects a first voltage V1 across the first battery BATT1 through the first voltage detection port. The controller 240 further includes: and a second voltage detection port connected to the second battery BATT2, wherein the controller 240 detects a second voltage V2 across the second battery BATT2 through the second voltage detection port. Specifically, the thick dotted lines in fig. 2 represent detection lines, and the controller 240 includes two first voltage detection ports connected to the positive electrode and the negative electrode of the first battery BATT1 through the detection lines, respectively. The controller 240 includes two second voltage detection ports connected to the positive electrode and the negative electrode of the second battery BATT2 through detection lines, respectively.
The following examples are given with respect to how the controller 240 switches the series charging circuit and the parallel charging circuit:
in some embodiments, the controller 240 determines that the current first voltage V1 of the first battery BATT1 is less than the first voltage threshold V in response to receiving the charging signalS1, and the current second voltage V2 of the second battery BATT2 is less than the second voltage threshold VSAnd 2, controlling the second switch K2 and the third switch K3 to be switched off and the first switch K1 to be switched on, so that the first battery BATT1 and the second battery BATT2 form a series charging circuit, which is referred to fig. 3. In some embodiments, the series charging circuit may be applied to a charging scenario of the first battery BATT1 and the second battery BATT2 with less electric quantity, so as to efficiently and rapidly charge the first battery BATT1 and the second battery BATT 2.
In other embodiments, the controller 240 determines that the current first voltage V1 of the first battery BATT1 is greater than or equal to the first voltage threshold V in response to receiving the charging signalS1, or the current second voltage V2 of the second battery BATT2 is greater than or equal to the second voltage threshold VSAnd 2, controlling the first switch K1 to be turned off, and controlling the second switch K2 and the third switch K3 to be turned on, so that the first battery BATT1 and the second battery BATT2 form a parallel charging circuit, which is shown in fig. 4. In some embodiments, the parallel charging circuit may be applied to charging scenarios of the first battery BATT1 and the second battery BATT2 with larger electric quantity, so as to reduce the charging power of the charger.
Wherein the first voltage threshold value VS1 means that: when the first battery BATT1 and the second battery BATT2 are switched from series connection to parallel connection, the critical voltage of the first battery BATT1 is obtained. Second voltage threshold VS2 means that: when the first battery BATT1 and the second battery BATT2 are switched from series connection to parallel connection, the critical voltage of the second battery BATT2 is obtained.
In some embodiments, with continued reference to fig. 2, the current limiting circuit 230 includes a current limiting resistor R connected to the at least one battery 210, and a current limiting switch Q connected in parallel to the current limiting resistor R, the current limiting switch Q being connected to a controller 240, the controller 240 being configured to control the current limiting switch Q to be turned off or on. IN some embodiments, the controller 240 controls the current limiting switch Q to be turned on, the current limiting resistor R is short-circuited, and the controller 240 controls the current limiting switch Q to be turned off, so that the current limiting resistor R is connected to the at least one battery 210 and the charging input terminal IN to limit the current.
IN some embodiments, the internal resistance of the first battery BATT1 is less than the internal resistance of the second battery BATT2, and the current limiting circuit 230 is connected between the negative terminal of the second battery BATT2 and the second charging input terminal IN 2. For example, the capacity of the first battery BATT1 may also be greater than the capacity of the second battery BATT 2. IN some embodiments, since the internal resistance of the first battery BATT1 is smaller than that of the second battery BATT2, during the charging process, the charging current of the second battery BATT2 is more likely to be overloaded, and the current limiting circuit 230 is connected to the negative electrode of the second battery BATT2 and the second charging input terminal IN2 to limit the current of the second battery BATT2, thereby avoiding the current overload problem and ensuring the safety of the charging and discharging circuit 200.
Further, IN some embodiments, with continued reference to fig. 2, one end of the current limiting circuit 230 is connected to the negative terminal of the second battery BATT2, the other end is connected to the second switch K2 to a node n, and the node n is connected to the second charging input terminal IN 2. IN some embodiments, the second battery BATT2 and/or the first battery BATT1 are prevented from being separately routed to the second charging input terminal IN2, and the charging and discharging circuit 200 is simplified.
When the internal resistance of the first battery BATT1 is smaller than the internal resistance of the second battery BATT2 and the first battery BATT1 and the second battery BATT2 form a parallel charging circuit, the problems of damage of the second battery BATT2 due to overload of a charging current and the like are avoided. In some embodiments, the controller 240 is further configured to: before the first battery BATT1 and the second battery BATT2 form a parallel charging circuit, a second predicted current flowing through the second battery BATT2 when the first battery BATT1 and the second battery BATT2 are connected in parallel is obtained, and if the second predicted current is greater than or equal to a second current threshold, the current limiting switch Q is controlled to be turned off, so that the current limiting resistor R is connected in series with the second battery BATT2 to limit the current of the second battery BATT2, referring to fig. 5. Wherein the second current threshold refers to: the maximum current that the second battery BATT2 can carry.
In other embodiments, the controller 240 is further configured to: if the second predicted current is detected to be smaller than the second current threshold, the current-limiting switch Q is controlled to be turned on, so that the current-limiting resistor R is short-circuited, referring to fig. 4.
In some embodiments, the controller 240 is specifically configured to: before the first battery BATT1 and the second battery BATT2 form a parallel charging circuit, detecting the current second internal resistance of the second battery BATT2, and controlling the first switch K1, the second switch K2 and the third switch K3 to be switched off; and obtaining a second predicted current based on the voltage at the two ends and the second internal resistance when the second batteries BATT2 are connected in parallel.
Specifically, before the first battery BATT1 and the second battery BATT2 are formed into a parallel charging circuit, if the controller 240 determines that the current first voltage V1 of the first battery BATT1 is greater than or equal to the first voltage threshold value Vs1, or the current second voltage V2 of the second battery BATT2 is greater than or equal to the second voltage threshold value Vs2, the controller 240 inputs the detection current to the second battery BATT2, and the second internal resistance Rb2 of the second battery BATT2 is obtained according to the current voltage and the detection current at two ends of the second battery BATT 2. And then the first switch K1, the second switch K2 and the third switch K3 are controlled to be switched off, the charging of the charging and discharging circuit 200 is stopped, the safety and the reliability during circuit switching are ensured, and the equivalent circuit formed at the moment refers to the graph 6.
Then according to the voltage (first voltage threshold V) between two ends of the second battery BATT2 when the first battery BATT1 and the second battery BATT2 are connected in parallelS1 or a second voltage threshold VS2) And a second internal resistance Rb2 determining a second predicted current of the second battery BATT 2.
IN addition, the current limiting circuit 230 may be further connected between the first battery BATT1 and the charging input terminal IN to limit the current of the first battery BATT1, thereby preventing the first battery BATT1 from being damaged due to the current overload. Similarly, the controller 240 may also detect the first predicted current flowing through the first battery BATT1 by the above method to ensure the safety and reliability of the charging and discharging circuit 200.
In some embodiments, the controller 240 is further configured to: in response to not receiving the charge signal, the first switch K1 is controlled to be turned off, and the second switch K2 and the third switch K3 are controlled to be turned on, so that the first battery BATT1 and the second battery BATT2 form a parallel discharge circuit, referring to fig. 7. In some embodiments, when the electronic device is in an initial state before being sold or in another uncharged state, the controller 240 controls the second switch K2 and the third switch K3 to be turned on, and the first switch K1 is turned off, so that the first battery BATT1 and the second battery BATT2 form a parallel discharge circuit, thereby avoiding a voltage reduction circuit from being provided to lose the capacities of the first battery BATT1 and the second battery BATT2, and improving the capacity utilization rates of the first battery BATT1 and the second battery BATT 2.
Based on the above, the charging and discharging circuit 200 and the electronic device provided by the embodiment of the present disclosure control the switch circuit 220 through the controller 240 to switch the series charging circuit and the parallel charging circuit, so that not only the charging efficiency can be improved, but also the charging power of the charger can be reduced, thereby satisfying different charging conditions and improving the charging experience. The controller 240 controls the switch circuit 220 to form a switchable single cell discharge circuit and a switchable parallel discharge circuit, so as to meet different power requirements of electronic equipment, avoid setting a voltage reduction circuit, and improve the utilization rate of battery capacity and the discharge efficiency. The current is limited to at least one battery by the current limiting circuit 230 to avoid damage to the battery due to current overload. When the series charging circuit and the parallel charging circuit are switched, the charging and discharging circuit 200 stops charging to ensure the switching safety, and at the moment, the predicted current of the battery is detected and is matched with the current limiting circuit 230 to avoid the current overload problem of the battery. The charging and discharging circuit 200 provided by the embodiment of the disclosure can reduce the charging power of the charger on the premise of ensuring the charging efficiency, has high discharging efficiency and good safety, and improves the charging and discharging experience of the electronic device.
For the method embodiments, since they substantially correspond to the apparatus embodiments, reference may be made to the apparatus embodiments for relevant portions of the description. The method embodiment and the device embodiment are complementary.
The above embodiments of the present disclosure may be complementary to each other without conflict.
The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (10)
1. A charging and discharging circuit, comprising:
a charging input terminal;
at least two batteries connected to the charging input;
a switching circuit connected between the at least two batteries;
one end of the current limiting circuit is connected with at least one battery, and the other end of the current limiting circuit is connected with the charging input end; and
a controller connected to the switching circuit and the current limiting circuit and configured to: controlling the switch circuit to enable the at least two batteries to form a series charging circuit or a parallel charging circuit, and controlling whether the current limiting circuit limits the current of at least one battery.
2. The charging and discharging circuit of claim 1, wherein the current limiting circuit comprises a current limiting resistor connected to at least one of the batteries, and a current limiting switch connected in parallel to the current limiting resistor, the current limiting switch is connected to the controller, and the controller is configured to control the current limiting switch to be turned on or off.
3. The charging and discharging circuit of claim 1, wherein the at least two batteries comprise a first battery and a second battery, and the charging input comprises a first charging input and a second charging input;
the positive electrode of the first battery is connected with the first charging input end, the negative electrode of the first battery is connected with the positive electrode of the second battery through the switch circuit, and the negative electrode of the first battery is also connected with the second charging input end through the switch circuit;
the positive pole of the second battery is connected with the first charging input end through the switch circuit, and the negative pole of the second battery is connected with the second charging input end.
4. The charging and discharging circuit of claim 3, wherein the internal resistance of the first battery is less than the internal resistance of the second battery, and the current limiting circuit is connected between the negative terminal of the second battery and the second charging input terminal.
5. The charging and discharging circuit of claim 3, wherein the switching circuit comprises:
a first switch connected between the negative electrode of the first battery and the positive electrode of the second battery;
the second switch is connected between the negative electrode of the first battery and the second charging input end; and
a third switch connected between the first charging input terminal and the anode of the second battery;
the controller is connected with the first switch, the second switch and the third switch, the first switch is turned on by controlling the second switch and the third switch to be turned off, so that the first battery and the second battery form a series charging circuit, and the controller controls the first switch to be turned off, the second switch and the third switch to be turned on, so that the first battery and the second battery form a parallel charging circuit.
6. The charging and discharging circuit of claim 5, wherein one end of the current limiting circuit is connected to the negative electrode of the second battery, the other end of the current limiting circuit is connected to a node with the second switch, and the node is connected to the second charging input terminal.
7. The charging and discharging circuit according to claim 3, wherein the controller comprises: the first voltage detection port is connected with the first battery, and the controller detects first voltages at two ends of the first battery through the first voltage detection port; and
the second voltage detection port is connected with the second battery, and the controller detects second voltages at two ends of the second battery through the second voltage detection port;
the controller controls the switch circuit according to the first voltage and the second voltage, so that the first battery and the second battery form a series charging circuit or a parallel charging circuit.
8. The charging and discharging circuit of claim 3, further comprising: the discharge output end comprises a first discharge output end and a second discharge output end, the first discharge output end is connected with the anode of the first battery, and the second discharge output end is connected with the cathode of the first battery.
9. The charging and discharging circuit according to any one of claims 1 to 8, wherein the switching circuit comprises a power switching tube.
10. An electronic device comprising the charge and discharge circuit according to any one of claims 1 to 9.
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| CN202020173256.3U CN211320982U (en) | 2020-02-14 | 2020-02-14 | Charging and discharging circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114844182A (en) * | 2022-07-06 | 2022-08-02 | 荣耀终端有限公司 | Charging circuit, charging method and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114844182A (en) * | 2022-07-06 | 2022-08-02 | 荣耀终端有限公司 | Charging circuit, charging method and electronic equipment |
| CN114844182B (en) * | 2022-07-06 | 2022-12-09 | 荣耀终端有限公司 | Charging circuit, charging method and electronic equipment |
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