CN106033908B

CN106033908B - Power supply circuit, working method thereof and electronic equipment

Info

Publication number: CN106033908B
Application number: CN201510126065.5A
Authority: CN
Inventors: 蕭勝文
Original assignee: Lenovo Beijing Ltd
Current assignee: Lenovo Beijing Ltd
Priority date: 2015-03-20
Filing date: 2015-03-20
Publication date: 2021-11-16
Anticipated expiration: 2035-03-20
Also published as: CN106033908A

Abstract

The invention discloses a power supply circuit, a working method thereof and electronic equipment, wherein the power supply circuit is applied to the electronic equipment, the input voltage of the power supply circuit during charging is different from the output voltage of the power supply circuit during discharging, and the power supply circuit comprises: the electronic equipment comprises an input end, an output end, a plurality of groups of battery packs and a plurality of switches, wherein the input end is used for connecting an external power supply and charging the plurality of groups of battery packs, the output end is used for supplying power to the electronic equipment, the plurality of groups of battery packs comprise two or more groups of battery packs, and the plurality of switches comprise two or more switches; each battery pack in the plurality of battery packs comprises more than one rechargeable battery; the plurality of switches are used for enabling the connection relation between the plurality of groups of battery packs to be switched between series connection and parallel connection.

Description

Power supply circuit, working method thereof and electronic equipment

Technical Field

The present invention relates to electronic technologies, and in particular, to a power supply circuit, a method for operating the power supply circuit, and an electronic device.

Background

At present, battery performance is an important factor for purchasing electronic equipment, and battery endurance and charging time are important performance indexes of the battery performance, wherein in popular terms, the battery endurance refers to the time that a fully charged battery can be used under a specific condition; and the charge time is the time required to fully charge a battery without charge. In order to obtain better battery endurance, manufacturers generally increase the battery capacity of electronic devices by various methods to achieve the purpose of prolonging the battery endurance. Battery capacity (or rated capacity) refers to the charge capacity of a battery, or the amount of electricity discharged by the battery under certain conditions, and is the product of current and time, where the unit of current is ampere, abbreviated as ampere (a), the unit of current may also be milliampere (mA), and the unit of time is hour (h), and then the unit of battery capacity is ampere hour (A.h) or milliampere hour (ma.h), and the battery capacity may also be expressed by coulomb (C), where 1A.h = 3600C. The above-mentioned predetermined conditions are predetermined conditions such as discharge rate, temperature, humidity, etc., for example, when the temperature is 20 ℃.

In general, a plurality of batteries are connected in parallel to achieve the purpose of increasing the battery capacity of electronic equipment. However, when the battery capacity increases, the charging time of the battery inevitably increases, and how to control the charging time while the battery capacity increases becomes an urgent problem to be solved.

Disclosure of Invention

In view of the above, embodiments of the present invention provide a power circuit, a method for operating the same, and an electronic device, which are capable of increasing battery capacity and shortening charging time.

The technical scheme of the embodiment of the invention is realized as follows:

in a first aspect, an embodiment of the present invention provides a power supply circuit, where an input voltage of the power supply circuit during charging is different from an output voltage of the power supply circuit during discharging, and the power supply circuit includes: an input terminal, an output terminal, a plurality of groups of battery packs and a plurality of switches, wherein,

the input end is used for connecting an external power supply and charging the plurality of groups of battery packs;

the output end is used for supplying power to the electronic equipment;

the multiple groups of battery packs comprise two groups and more than two groups of battery packs, wherein each group of battery pack in the multiple groups of battery packs comprises one or more than one rechargeable battery;

the plurality of switches include two or more switches; the plurality of switches are used for enabling the connection relation between the plurality of groups of battery packs to be switched between series connection and parallel connection.

In a second aspect, an embodiment of the present invention provides a method for operating a power supply circuit provided in the above first aspect, where the method includes:

connecting the positive electrode of the 1 st group of battery packs in the N groups of battery packs in the power circuit with the input end of the power circuit; n is an integer greater than or equal to 2;

connecting the negative electrode of the j group battery pack in the N group battery packs with the positive electrode of the (j + 1) group battery pack in the N group battery packs, wherein j is greater than or equal to 1 and less than or equal to (N-1);

and connecting the negative electrode of the Nth battery pack in the N battery packs with the ground of the power supply circuit.

In a third aspect, an embodiment of the present invention provides a method for operating a power supply circuit provided in the above first aspect, where the method includes:

connecting the positive electrode of the 1 st battery pack in the N battery packs with the positive electrode of the Nth battery pack in the N battery packs;

connecting the negative electrode of the (j-1) th group of battery packs in the N groups of battery packs with the negative electrode of the ith group of battery packs in the N groups of battery packs, wherein j is an integer which is more than or equal to 2 and less than or equal to (N-1);

In a fourth aspect, an embodiment of the present invention provides an electronic device, where the electronic device includes the power supply circuit provided in the first aspect, and the electronic device further includes a first connection unit, a second connection unit, and a third connection unit, where:

the first connecting unit is used for connecting the positive electrode of the 1 st group of battery packs in the N groups of battery packs in the power circuit with the input end of the power circuit; n is an integer greater than or equal to 2;

the second connection unit is used for connecting the negative electrode of the j group battery pack in the N group battery packs with the positive electrode of the (j + 1) group battery pack in the N group battery packs, and j is greater than or equal to 1 and less than or equal to (N-1);

and the third connecting unit is used for connecting the negative pole of the Nth group of battery packs in the N groups of battery packs with the ground of the power supply circuit.

In a fifth aspect, an embodiment of the present invention provides an electronic device, where the electronic device includes the power supply circuit provided in the first aspect, and the electronic device further includes a fourth connection unit, a fifth connection unit, and a sixth connection unit, where:

the fourth connecting unit is used for connecting the positive electrode of the 1 st battery pack in the N battery packs with the positive electrode of the N battery pack in the N battery packs;

the fifth connecting unit is used for connecting the negative electrode of the (j-1) th group of battery packs in the N groups of battery packs with the negative electrode of the ith group of battery packs in the N groups of battery packs, and j is an integer which is greater than or equal to 2 and less than or equal to (N-1);

and the sixth connecting unit is used for connecting the negative electrode of the Nth group of battery packs in the N groups of battery packs with the ground of the power supply circuit.

The embodiment of the invention provides a power supply circuit, a working method thereof and electronic equipment, wherein the input voltage of the power supply circuit during charging is different from the output voltage of the power supply circuit during discharging, and the power supply circuit comprises: the electronic equipment comprises an input end, an output end, a plurality of groups of battery packs and a plurality of switches, wherein the input end is used for connecting an external power supply and charging the plurality of groups of battery packs, the output end is used for supplying power to the electronic equipment, the plurality of groups of battery packs comprise two or more groups of battery packs, and the plurality of switches comprise two or more switches; each battery pack in the plurality of battery packs comprises more than one rechargeable battery; the plurality of switches are used for enabling the connection relation between the plurality of groups of battery packs to be switched between series connection and parallel connection. Thus, the battery capacity can be increased and the charging time can be shortened.

Drawings

FIG. 1-1 is a diagram illustrating a first scenario in the related art;

FIG. 1-2 is a diagram illustrating a second scenario in the related art;

fig. 1-3 are schematic structural diagrams of a power circuit according to an embodiment of the invention;

fig. 1-4 are schematic structural diagrams illustrating a first switch according to an embodiment of the invention;

fig. 1-5 are schematic diagrams illustrating connection structures of the power circuit shown in fig. 1-3 during charging according to a first embodiment of the present invention;

fig. 1-6 are schematic diagrams illustrating a current flow when the power circuit shown in fig. 1-3 is charged according to a first embodiment of the present invention;

fig. 1-7 are schematic diagrams illustrating connection structures of the power circuit shown in fig. 1-3 during discharging according to a first embodiment of the present invention;

FIGS. 1-8 are schematic diagrams illustrating the current flow of the power circuit shown in FIGS. 1-3 during discharging according to one embodiment of the present invention;

FIG. 2-1 is a schematic diagram of a first power circuit according to a second embodiment of the present invention;

FIG. 2-2 is a schematic diagram of a second power circuit according to a second embodiment of the present invention;

FIG. 3-1 is a first schematic diagram of a third exemplary embodiment of a power circuit;

FIG. 3-2 is a schematic diagram of a third exemplary embodiment of a power circuit;

fig. 3-3 is a schematic diagram of a third exemplary embodiment of a third power circuit;

fig. 3-4 are schematic diagrams illustrating a third exemplary power circuit according to the present invention;

FIG. 4-1 is a specific circuit diagram of FIG. 2-1 according to one embodiment of the present invention;

FIG. 4-2 is a schematic diagram of one implementation of FIG. 4-1 in an embodiment of the invention;

4-3 are schematic diagrams of current flow during discharge of the power supply circuit shown in FIG. 4-2;

4-4 are schematic current flow diagrams for discharging the power supply circuit shown in FIG. 4-2;

FIG. 5-1 is a first schematic structural diagram of a five-power circuit according to an embodiment of the present invention;

FIG. 5-2 is a second schematic structural diagram of a fifth power circuit according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a six-power circuit according to an embodiment of the invention.

Detailed Description

The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.

Example one

The embodiment of the invention provides a power supply circuit, which can be applied to electronic equipment, wherein the electronic equipment generally refers to various equipment needing power supply, especially refers to a movable terminal (mobile terminal for short), such as a notebook computer, a smart phone, an electric automobile, an electric bicycle, a personal digital assistant, a vehicle-mounted terminal, such as a vehicle-mounted television, a navigator, a Music Player, such as (MP 3, Music Player 3), a video Player, a tablet computer, a Netbook (Netbook for short), and the like, and the movable terminal generally supplies power through an external alternating current power supply and can also supply power through a built-in power supply circuit; taking a tablet computer as an example of an electronic device, when there is no ac current around the tablet computer and a rechargeable battery in the tablet computer is charged, the tablet computer can use its own rechargeable battery to supply power.

The power supply circuit generally includes a charging circuit for charging a built-in battery pack or battery, and a discharging circuit for discharging the built-in battery pack or battery to supply power to a main functional part of the electronic apparatus, such as a display screen. In the implementation, the charging circuit and the discharging circuit often share a common circuit device, in other words, the charging circuit and the discharging circuit are not strictly distinguished, and the foregoing charging circuit and discharging circuit are only a logical division.

The Power supply circuit provided in this embodiment can be used in general charging devices, such as Power Banks (Power Banks) and Storage batteries (Storage batteries) devices for charging mobile terminals, in addition to the electronic devices, where: the storage battery device is a device specially used for supplying power to electronic equipment, and generally comprises a storage battery, a charging circuit and a discharging circuit, wherein the storage battery device can convert chemical energy stored in the storage battery into electric energy through the discharging circuit when discharging so as to be supplied to external electronic equipment for use; the active substances in the storage battery can be regenerated by connecting the charging circuit with an external power supply in a charging mode after discharging, namely, the electric energy input from the outside is stored into chemical energy through the charging circuit, and the chemical energy of the storage battery is converted into the electric energy through the discharging circuit when the storage battery needs to be discharged.

The input voltage of the power supply circuit in the embodiment of the invention is different from the output voltage of the power supply circuit in the charging process; assuming that the power circuit can be divided into a charging circuit and a discharging circuit, when the power circuit is charging, the charging circuit needs to be connected to an external power source through a voltage converter, for example, to connect direct current, and then the input voltage during charging refers to the voltage between the charging circuit and the voltage converter, in other words, the input voltage during charging of the power circuit may refer to the output voltage of the voltage converter; of course, the charging circuit may also be directly connected to the external power source, and then the input voltage of the power circuit during charging is the output voltage of the external power source.

Referring to the input voltage of the power circuit during charging in the embodiment of the present invention, when there is ac power around, as shown in fig. 1-1, the tablet pc 13 is connected to the ac power socket 11 through the charger 12. When the rechargeable battery is not installed on the tablet computer 13, the tablet computer 13 is directly powered by alternating current. When the rechargeable battery is mounted on the tablet pc 13 and the rechargeable battery is not fully charged, the rechargeable battery may also be charged using ac power. In fig. 1-1, the charger is actually a voltage converter for converting the voltage of ac into the voltage available for the tablet pc, and taking ac in our country as an example, the charger 12 is connected to the socket 11, the input voltage of the charger 12 is 220 volts (V), and the output voltage of the charger 12 is about 10V to 20V, which is very different from manufacturers to manufacturers, but generally, the magnitude of the output voltage is about the same. The input voltage of the charger 12 in this example is 220V because the voltage of the commercial power (alternating current) in our country is 220V.

As shown in fig. 1-2, a charging circuit 22 is further provided between the output of the charger 12 and the rechargeable battery 210, in order to increase the battery capacity of the electronic device, two rechargeable batteries (hereinafter referred to as batteries) are generally used to supply power to the electronic device, when one rechargeable battery is used up, another battery is used to supply power to the electronic device, and the two batteries are connected in parallel to increase the battery capacity, so that a user can use the electronic device for a long time without using the electronic device so as to charge the electronic device.

In the embodiment of the present invention, it is assumed that the power supply circuit may be divided into a charging circuit and a discharging circuit, and when the power supply circuit discharges, the discharging circuit discharges a built-in battery pack or battery to supply power to a main functional component of the electronic device, such as a display screen, and an output voltage of the power supply circuit when discharging is an output voltage of the discharging circuit.

Fig. 1-3 are schematic diagrams illustrating a structure of a power circuit according to an embodiment of the present invention, as shown in fig. 1-3, the power circuit includes: an input terminal (input) 110, an output terminal (output) 120, a plurality of groups of battery packs (B1, B2) 130, and a plurality of switches (Switch, abbreviated as SW, e.g., SW1 and SW 2) 140, wherein,

the input terminal 110 is used for connecting an external power supply and charging the plurality of battery packs 130; the external power source may be an alternating current or other battery device.

The output end 120 is configured to supply power to the electronic device; here, the term specifically refers to power supply to power consuming components of the electronic device, for example, a display of the electronic device, a processor on a motherboard, a memory, and the like.

The plurality of battery packs 130 include two or more battery packs, wherein each battery pack of the plurality of battery packs includes more than one rechargeable battery;

the plurality of switches 140 includes two or more switches; the plurality of switches are used for enabling the connection relation between the plurality of groups of battery packs to be switched between series connection and parallel connection.

In the embodiment of the invention, when each battery pack in the plurality of battery packs comprises two or more rechargeable batteries, the batteries in each battery pack in the plurality of battery packs are connected in the same way. For example, in fig. 1-3, each battery pack includes more than two batteries, and the batteries in each battery pack are connected in parallel; of course, those skilled in the art may also connect the batteries in each group of battery packs in series, and may also connect the batteries in series and in parallel.

In an embodiment of the present invention, each of the plurality of switches has a first end, a second end and a third end, wherein the first end of each switch can be communicated with the second end of the switch or the third end of the switch;

it should be noted that fig. 1 to 3 are schematic diagrams, the devices in fig. 1 to 3 are only used for illustrating the functions of the devices, and other components that can perform the same functions may be used instead in the specific implementation process. For example, as shown in fig. 1-3, the switch 140 in the embodiment of the present invention is a Single Pole Double Throw (SPDT) switch, which generally includes three terminals, one of which is a fixed terminal and the remaining two terminals are movable terminals. Taking the switch SW1 as an example, as shown in fig. 1-4, the stationary end (first end) of the switch SW1 is denoted by a letter a, the two movable ends are denoted by (second end) b and (third end) c, respectively, and the stationary end (first end a) can be connected to the movable end (second end b) or (third end c).

In practice, because a single-pole double-pin switch is difficult to integrate and the size of a power circuit is large, in the process of implementation, a triode, a low-Load switch (Load switch), a field effect transistor, a diode and other components are generally used instead of a double-pole double-throw switch.

In the embodiment of the present invention, the power circuit may further include a ground terminal (GND) 181 for connecting the power circuit to ground, and further, an interference suppressor may be further added at the ground terminal 181 for preventing electromagnetic interference, for example, a capacitor is connected in series with the ground terminal 181.

In the embodiment of the present invention, the switches 130 are configured to connect the plurality of groups of battery packs in series when the power circuit is charged; and when the power supply circuit discharges, the multiple groups of battery packs are connected in parallel. This is explained below with the aid of fig. 1-3.

Fig. 1-5 are schematic diagrams illustrating a connection structure when the power circuit shown in fig. 1-3 is charged according to a first embodiment of the present invention, and fig. 1-6 are schematic diagrams illustrating a current flow when the power circuit shown in fig. 1-3 is charged according to the first embodiment of the present invention, as shown in fig. 1-5 and fig. 1-6, when the power circuit is charged, a first end a of a first switch 140 (SW 1) is connected to a second end B of a first switch SW1, wherein a second end B of the first switch SW1 is connected to the input terminal 110, and a second end a of the first switch SW1 is connected to an anode of a first battery pack (B1); the first terminal a of the second switch 140 (SW 2) is connected to the second terminal B of the switch SW2, wherein the second terminal a of the second switch SW2 is connected to the negative terminal of the first battery B1, and the second terminal B of the second switch SW2 is connected to the output terminal 120. Thus, the first battery pack B1 and the second battery pack B2 can be connected in series, such that the current flows in the following directions: the alternating current from the socket 11 is subjected to voltage conversion by the charger 12 and then enters the input terminal 110, then enters the anode of the first battery pack B1 from the input terminal 110, then enters the anode of the second battery pack B2 from the cathode of the first battery pack B1, and then enters the ground from the cathode of the second battery pack B2.

Fig. 1-7 are schematic diagrams illustrating a connection structure of the power circuit shown in fig. 1-3 during discharging in a first embodiment of the present invention, and fig. 1-8 are schematic diagrams illustrating a current flow direction of the power circuit shown in fig. 1-3 during discharging in the first embodiment of the present invention, as shown in fig. 1-7 and fig. 1-8, when the power circuit is discharged, a first terminal a of a first switch 140 (SW 1) is connected to a second terminal c of a first switch SW1, wherein the second terminal c of the first switch SW1 is connected to the output terminal 120, and a second terminal a of the first switch SW1 is connected to a positive electrode of a first battery pack (B1); the first terminal a of the second switch 140 (SW 2) is connected to the second terminal c of the switch SW2, wherein the second terminal a of the second switch SW2 is connected to the negative electrode of the first battery B1, and the second terminal c of the second switch SW2 is connected to the ground terminal 181. Thus, the first battery pack B1 and the second battery pack B2 can be connected in parallel, so that the current flows in the following directions: current from the positive pole of first battery B1 flows to output 120; current from the positive pole of second battery B2 flows to output 120.

Example two

Based on the first embodiment, an embodiment of the present invention provides a power circuit, where an input voltage of the power circuit during charging is different from an output voltage of the power circuit during discharging.

Fig. 2-1 is a schematic diagram of a first configuration of a power circuit according to an embodiment of the present invention, and as shown in fig. 2-1, the power circuit includes: an input terminal 110, an output terminal 120, a plurality of sets of battery packs 130, a plurality of switches 140, a Controller (OR Controller) 150, and a ground terminal (GND) 181, wherein,

the input terminal 110 is used for connecting an external power supply and charging the plurality of groups of battery packs;

the output end 120 is configured to supply power to the electronic device;

The ground terminal 181 is used to connect the power supply circuit to the ground.

The controller 150 is configured to prevent the two or more sets of battery packs from being charged (oppositely charged) with each other.

When the power circuit includes two groups of battery packs, as shown in fig. 2-1, the controller 150 is located between the positive electrode of a first group of the two groups of battery packs and the positive electrode of a second group of the two groups of battery packs. In a specific implementation, the controller may be implemented by using diodes, and as shown in fig. 1 to 4, in order to prevent the first battery pack and the second battery pack from being charged, a first diode 151 may be connected in series between the third terminal c of the first switch SW1 and the output terminal 120, and a second diode 152 may be connected in series between the second terminal b of the second switch SW2 and the output terminal 120. The power circuit shown in fig. 2-1 utilizes the parallel connection of diodes, and when the voltage of any one of the first battery pack and the second battery pack is higher, the diode of the circuit with higher voltage is turned on; and the diode on the lower point will be conducted when the other path is lower than the diode, so the circuit of the first battery pack and the circuit of the second battery pack are continuously and automatically switched, thereby avoiding the problem that the service life of the battery is influenced and the safety problem is caused by mutual charging caused by inconsistent voltage in a plurality of groups of battery packs.

It should be noted that the controller 150 may also be in the form of a transistor-matched software instead of the diode shown in fig. 2-1, so as to control the conduction of the higher voltage of the multiple battery packs, but the implementation of the controller 150 using a diode is an effective, low-cost and easy-to-implement manner.

In the power supply circuit shown in fig. 1-8, since no controller is provided in the power supply circuit, when the power supply circuit is discharged, the current from the positive electrode of the first battery B1 flows to the output terminal 120, and then it is likely to flow not to the power consuming components of the electronic device but to the positive electrode of the second battery B2; accordingly, after the current from the positive electrode of the second battery pack B2 flows to the output terminal 120, it is likely to flow not to the power consuming components of the electronic device but to the positive electrode of the first battery pack B1, i.e., there may be a case of charging the first battery pack and the second battery pack. However, in the power supply circuit shown in fig. 2-2, when the power supply circuit is discharged, the current from the positive electrode of first battery pack B1 flows to output terminal 120 due to presence of second diode 152, and then intelligently flows to the power consuming components of the electronic device; accordingly, since the current from the anode of second battery B2 flows to output terminal 120 and then only flows to the power consuming components of the electronic device due to the presence of first diode 151, first diode 151 and second diode 152 can effectively prevent the occurrence of a charging condition between first battery B1 and second battery B2.

EXAMPLE III

Based on the first embodiment, an embodiment of the present invention provides a power circuit, where an input voltage of the power circuit during charging is different from an output voltage of the power circuit during discharging. The power supply circuit includes: n group battery, N first switch and (N-2) second switch, N is the integer that is more than or equal to 2, wherein:

each of the N first switches has a first end a, a second end b, and a third end c (as shown in fig. 1-4), wherein the first end a of each of the N first switches is in communication with its own second end b or its own third end c.

The positive electrode of the 1 st group of battery packs in the N groups of battery packs is connected with the first end of the 1 st first switch in the N first switches, the second end of the 1 st first switch is connected with the input end of the power supply circuit, and the third end of the 1 st first switch is connected with the output end of the power supply circuit;

the negative electrode of the ith battery pack in the N battery packs is connected with the first end of an (i + 1) th first switch, the second end of the (i + 1) th first switch is connected with the positive electrode of the (i + 1) th battery pack, the third end of the (i + 1) th first switch is connected with the ground, and the positive electrode of the (i + 1) th battery pack and the output end of the power supply circuit are connected with the ith second switch; the i is more than or equal to 1 and less than or equal to (N-2);

the negative electrode of the (N-1) th battery pack in the N groups of battery packs is connected with the first end of an Nth first switch, the second end of the Nth first switch is connected with the positive electrode of the Nth battery pack, and the third end of the Nth first switch is connected with the ground;

and the positive electrode of the Nth group of battery packs is connected with the output end of the power circuit.

The following assigns a value to N to explain the technical solution provided by the third embodiment of the present invention. When N =2, as shown in fig. 1 to 3, the power supply circuit provided by the third embodiment of the present invention includes: 2 groups of battery packs (B1 and B2), 2 first switches (SW 1 and SW 2), and 0 second switches, wherein:

each of the 2 first switches (SW 1 or SW 2) has a first terminal a, a second terminal b and a third terminal c, wherein the first terminal a of each of the N first switches is communicated with the second terminal b or the third terminal c thereof.

The positive pole of the 1 st battery pack (B1) in the 2 battery packs is connected with the first end a of the 1 st first switch (SW 1) in the 2 first switches, the second end B of the 1 st first switch (SW 1) is connected with the input end 110 of the power circuit, and the third end c of the 1 st first switch (SW 1) is connected with the output end 120 of the power circuit;

the negative pole of the 1 st battery pack (B1) of the 2 groups of battery packs is connected with the first end a of a 2 nd first switch (SW 2), the second end B of the 2 nd first switch (SW 2) is connected with the positive pole of the 2 nd battery pack (B2), and the third end c of the 2 nd first switch (SW 2) is connected with the ground (the ground terminal 181);

the positive pole (B2) of the group 2 battery pack is connected with the output end 120 of the power supply circuit, and the negative pole of the group 2 battery pack (B2) is connected with the ground (the grounding end 181) of the power supply circuit.

When N =3, as shown in fig. 3-1, the power supply circuit provided by the third embodiment of the present invention includes: 3 groups of battery packs, 3 first switches (SW 4, SW3, and SW 2), and 1 second switch (SW 1), wherein:

each of the 3 first switches (SW 4, SW3 or SW 2) has a first end a, a second end b and a third end c (as shown in fig. 3-1), wherein the first end a of each of the 3 first switches is communicated with the second end b or the third end c thereof.

The positive pole of the 1 st battery pack (B1) of the 3 battery packs is connected with the first end a of the 1 st first switch (SW 4) in the 3 first switches, the second end B of the 1 st first switch (SW 4) is connected with the input end 110 of the power circuit, and the third end c of the 1 st first switch (SW 4) is connected with the output end 120 of the power circuit.

The negative pole of the 1 st group battery pack (B1) in the 3 group battery packs is connected with the first end a of the 2 nd first switch (SW 3), the second end B of the 2 nd first switch (SW 3) is connected with the positive pole of the 2 nd group battery pack (B2), the third end c of the 2 nd first switch (SW 3) is connected with the ground, and the 1 st second switch (SW 1) is connected between the positive pole of the 2 nd group battery pack (B2) and the output end 120 of the power supply circuit.

The negative pole of the 2 nd battery pack (B2) of the 3 groups of battery packs is connected with the first end a of a 3 rd first switch (SW 2), the second end B of the 3 rd first switch (SW 2) is connected with the positive pole of the 3 rd battery pack (B3), and the third end c of the 3 rd first switch (SW 2) is connected with the ground;

the positive pole of the group 3 battery pack (B3) is connected to the output terminal 120 of the power circuit, and the negative pole of the group 3 battery pack (B3) is connected to ground.

It should be noted that the second switch in the embodiment of the present invention may be different from the first switch, and as shown in fig. 3-1, the second switch may be a single-open switch, and the first switch is a single-pole double-throw switch. The second switch may be the same as the first switch, as shown in fig. 3-2, or may be a single pole double throw switch.

When N =4, as shown in fig. 3-3, the power supply circuit provided in the third embodiment of the present invention includes: 4 groups of battery packs (B1, B2, B3, and B4), 4 first switches (SW 6, SW5, SW3, and SW 2), and 2 second switches (SW 1 and SW 4), wherein:

each of the 4 first switches (SW 6, SW5, SW3 and SW 2) has a first terminal a, a second terminal b and a third terminal c (as shown in fig. 3-3), wherein the first terminal a of each of the 4 first switches is in communication with either its own second terminal b or its own third terminal c.

The positive pole of the 1 st battery pack (B1) of the 4 battery packs is connected with the first end a of the 1 st first switch (SW 6) in the 4 first switches, the second end B of the 1 st first switch (SW 6) is connected with the input end 110 of the power circuit, and the third end c of the 1 st first switch (SW 6) is connected with the output end 120 of the power circuit.

The negative pole of the 1 st group battery pack (B1) in the 4 group battery packs is connected with the first end a of the 2 nd first switch (SW 5), the second end B of the 2 nd first switch (SW 5) is connected with the positive pole of the 2 nd group battery pack (B2), the third end c of the 2 nd first switch (SW 5) is connected with the ground, and the 1 st second switch (SW 4) is connected between the positive pole of the 2 nd group battery pack (B2) and the output end 120 of the power supply circuit.

The negative pole of the 2 nd group battery pack (B2) in the 4 group battery packs is connected with the first end a of a 3 rd first switch (SW 3), the second end B of the 3 rd first switch (SW 3) is connected with the positive pole of the 3 rd group battery pack (B3), the third end c of the 3 rd first switch (SW 3) is connected with the ground, and a 2 nd second switch (SW 1) is connected between the positive pole of the 3 rd group battery pack (B3) and the output end 120 of the power supply circuit.

The negative pole of the 3 rd battery pack (B3) of the 4 th battery packs is connected with the first end a of a 4 th first switch (SW 2), the second end B of the 4 th first switch (SW 2) is connected with the positive pole of the 4 th battery pack (B4), and the third end c of the 4 th first switch (SW 2) is connected with the ground;

the positive pole of the group 4 battery pack (B4) is connected to the output terminal 120 of the power circuit, and the negative pole of the group 4 battery pack (B4) is connected to ground.

When N =5, as shown in fig. 3 to 4, the power supply circuit provided by the third embodiment of the present invention includes: 5-group battery packs (B1, B2, B3, B4, and B5), 5 first switches (SW 8, SW7, SW5, SW3, and SW 2), and 3 second switches (SW 6, SW4, and SW 1), wherein:

each of the 5 first switches (SW 8, SW7, SW5, SW3 and SW 2) has a first end a, a second end b and a third end c (as shown in fig. 3-4), wherein the first end a of each of the 5 first switches is communicated with the second end b or the third end c.

The positive pole of the 1 st battery pack (B1) of the 5 battery packs is connected with the first end a of the 1 st first switch (SW 8) in the 5 first switches, the second end B of the 1 st first switch (SW 8) is connected with the input end 110 of the power circuit, and the third end c of the 1 st first switch (SW 8) is connected with the output end 120 of the power circuit.

The negative pole of the 1 st group battery pack (B1) in the 8 group battery packs is connected with the first end a of a 2 nd first switch (SW 7), the second end B of the 2 nd first switch (SW 7) is connected with the positive pole of the 2 nd group battery pack (B2), the third end c of the 2 nd first switch (SW 7) is connected with the ground, and the 1 st second switch (SW 6) is connected between the positive pole of the 2 nd group battery pack (B2) and the output end 120 of the power supply circuit.

The negative pole of the 2 nd group battery pack (B2) in the 5 group battery packs is connected with the first end a of a 3 rd first switch (SW 5), the second end B of the 3 rd first switch (SW 5) is connected with the positive pole of the 3 rd group battery pack (B3), the third end c of the 3 rd first switch (SW 5) is connected with the ground, and the 2 nd first switch (SW 4) is connected between the positive pole of the 3 rd group battery pack (B3) and the output end 120 of the power supply circuit.

The negative pole of the 3 rd group battery pack (B3) in the 5 group battery packs is connected with the first end a of a 4 th first switch (SW 3), the second end B of the 4 th first switch (SW 3) is connected with the positive pole of the 4 th group battery pack (B4), the third end c of the 4 th first switch (SW 3) is connected with the ground, and the 3 rd first switch (SW 1) is connected between the positive pole of the 4 th group battery pack (B4) and the output end 120 of the power supply circuit.

The negative pole of the 4 th battery pack (B4) of the 5 battery packs is connected with the first end a of a 5 th first switch (SW 2), the second end B of the 5 th first switch (SW 2) is connected with the positive pole of the 5 th battery pack (B5), and the third end c of the 5 th first switch (SW 2) is connected with the ground;

the positive pole of the group 5 battery pack (B5) is connected to the output terminal 120 of the power circuit, and the negative pole of the group 5 battery pack (B5) is connected to ground.

Those skilled in the art can obtain the schematic diagrams of the power supply circuit when N =6 and 6 or more according to the above description, and therefore, the detailed description is omitted. Fig. 1-3, 3-1, 3-3 and 3-4 show schematic diagrams of the power circuit when N =2 to 5, as can be seen from fig. 1-3, 3-1 to 3-4, groups of batteries in the power circuit are connected in series (Serial) when the power circuit is charged and in parallel when the power circuit is discharged; therefore, the power circuit is also called an xS power circuit, where x denotes a number and S denotes a series connection; correspondingly, the power supply circuits shown in fig. 1-3 are referred to as 2S power supply circuits, the power supply circuits shown in fig. 3-1 are referred to as 3S power supply circuits, the power supply circuits shown in fig. 3-3 are respectively referred to as 4S power supply circuits, and the power supply circuits shown in fig. 3-4 are respectively referred to as 5S power supply circuits. In the xS power supply circuit, the battery blocks generally have the same chemical properties, for example, the battery blocks in the xS may all use nickel-cadmium (Ni-Cd) batteries, the battery blocks in the xS may all use nickel-hydrogen batteries, and the battery blocks in the xS may all use nickel-cadmium lithium ion batteries.

In the above xS power circuit, if the connection mode of each group of battery packs is the same, for example, each battery pack is connected in parallel, the power circuit may be written as xSxP, where the lower case letter x represents a number, the upper case letter S represents series connection as described above, and the upper case letter P represents parallel connection; for another example, if each battery pack is connected in series, the power circuit may be denoted as xSxS, where the lower case letter x represents a number and the upper case letter S represents series as described above. For example, when looking at the power supply circuit with circuit symbol 2S2P, as known from 3S2P, the power supply circuit is connected in series with 3 groups of battery packs during charging, and each battery pack includes 2 battery blocks connected in parallel. Based on this, the power supply circuits shown in fig. 1-3, 3-1 to 3-4 described above can be all referred to as xSxP circuits.

Example four

Based ON the foregoing embodiments, several xS power circuit diagrams are shown, and a specific circuit diagram is given below, fig. 4-1 is a specific circuit diagram of fig. 2-1 in one embodiment of the present invention, a third switch (ON/OFF) in fig. 4-1 may be cooperatively controlled by software and/or hardware to conduct and block, fig. 4-2 is a schematic diagram of an implementation manner of fig. 4-1 in an embodiment of the present invention, as shown in fig. 4-1 and fig. 4-2, and both the first switch SW1 and the second switch SW2 in fig. 1-3 are implemented by Metal-Oxide-Semiconductor Field Effect transistors (MOSFETs) and diodes. The first switch SW1 adopts two MOSFETs, which are numbered as MOSFET #1 and MOSFET #3, respectively, the second first switch SW2 also adopts two MOSFETs, which are numbered as MOSFET #2 and MOSFET #4, respectively, and the MOSFET #1 and the diode are used for realizing the conduction and the blocking between the first end a of the first switch SW1 and the second end b thereof; the MOSFET #3 and the diode are used for realizing the conduction and the blocking between the first end a of the first switch SW1 and the second end c of the first switch; the MOSFET #2 and the diode are used for realizing the conduction and the blocking between the first end a of the first switch SW2 and the second end b thereof; the MOSFET #4 and the diode are used to realize conduction and blocking between the first terminal a of the first switch SW2 and the second terminal c thereof.

When the first terminal a of the first switch SW1 is connected to the second terminal b thereof, the first terminal a of the first switch SW1 may be turned ON by a third switch (ON/OFF) between the first terminal a and the second terminal b thereof, and when the first terminal a of the first switch SW1 is not required to be connected to the second terminal b thereof, the first terminal a of the first switch SW1 may be turned OFF by a third switch (ON/OFF) between the first terminal a and the second terminal b thereof; when the first terminal a of the first switch SW1 does not need to be connected to the third terminal c thereof, blocking may be achieved by a third switch (ON/OFF) between the first terminal a of the first switch SW1 and the third terminal c thereof; when the first terminal a of the first switch SW1 needs to be connected to the third terminal c thereof, the conduction may be achieved by a third switch (ON/OFF) between the first terminal a of the first switch SW1 and the third terminal c thereof. Thus, the connection and disconnection between the first terminal a of the second first switch (SW 2) and the second terminal b thereof, and the connection and disconnection between the first terminal a of the second first switch (SW 2) and the third terminal c thereof, can be performed by the corresponding third switch (ON/OFF).

As a preferred solution, in the embodiment of the present invention shown in fig. 4-1, the first switch (SW 1) is a P-type MOSFET (P-MOSFET), and here, mainly in consideration of impedance, the MOSFET impedance (generally less than 20 milli-ohms (mOhm) is relatively lower than that of other transistors, which can reduce loss/power consumption, and low loss is also helpful for increasing user's usage time).

The first switch (SW 1) in the embodiment of the present invention may be an N-type MOSFET (N-MOSFET), which mainly depends on the conduction relationship between the Gate (Gate) and the Source (Source) of the MOSFET, and when the N-MOSFET is used for the first switch, the N-MOSFET is turned on when the Gate voltage is higher than the Source, and when the P-MOSFET is used for the first switch, the P-MOSFET is turned on when the Gate voltage is higher than the Source.

Fig. 4-3 is a schematic diagram showing a current flow direction at the time of discharging of the power supply circuit shown in fig. 4-2, fig. 4-4 is a schematic diagram showing a current flow direction at the time of discharging the power supply circuit shown in fig. 4-2, and as shown in fig. 4-3, when the power supply circuit is discharged, MOSFET #1 and MOSFET #4 are in a blocking (OFF) state, and the third switch corresponding to MOSFET #1 and MOSFET #4 can be made to be in an OFF state; meanwhile, MOSFET #2 and MOSFET #3 are ON, and the third switch corresponding to MOSFET #2 and MOSFET #3 may be turned ON, so that first battery pack B1 and second battery pack B2 constitute a parallel structure. As shown in fig. 4 to 4, when the power supply circuit is charged, MOSFET #2 and MOSFET #3 are in a blocking state, and MOSFET #1 and MOSFET #4 are in a conducting state, so that first battery pack B1 and second battery pack B2 constitute a series-connected structure. It should be noted that, in the power supply circuit shown in fig. 4-4, the current can flow to the output terminal 120 of the power supply circuit in addition to the second battery pack B2, in other words, the power supply circuit provided in this embodiment can simultaneously supply power to the power consuming components of the electronic device during charging.

EXAMPLE five

In the power circuit of xS, the larger the number of x, the larger the number of battery packs in the power circuit, and the higher the output voltage of the charger (i.e. the input voltage of the power circuit) when charging the power circuit, for example, for the power circuit having a circuit configuration of 2S2P, assuming that the voltage of each battery is 3V, when charging the power circuit having a configuration of 2S2P, the charging voltage is 6V, and the output voltage of the power circuit having a configuration of 2S2P is 3V; now, a battery pack is added, the circuit structure becomes 3S2P, and assuming that the voltage of each battery is still 3V, when the power supply circuit with the 3S2P structure is charged, the charging voltage becomes 9V, and the output voltage of the power supply circuit with the 3S2P structure is still 3V. When the number of the series-connected groups is higher, the output voltage of the charger is also higher; the following provides a power supply circuit capable of changing an input voltage of the power supply circuit.

Fig. 5-1 is a schematic structural diagram of a five-power circuit according to an embodiment of the invention, as shown in fig. 5-1, the power circuit includes a plurality of input terminals 110, an output terminal 120, a plurality of groups of battery packs 130, and a plurality of switches 140, wherein,

the output end 120 is configured to supply power to the electronic device;

In the embodiment of the present invention, the power circuit may further include a ground terminal 181, which is used to connect the power circuit to ground.

In the embodiment of the present invention, the power circuit may further include a controller 150 for preventing the two or more sets of battery packs from being charged (oppositely charged) with each other.

Specifically, as shown in fig. 5-1, when the power supply circuit includes 3 sets of battery packs, 4 first switches (SW 1 to SW 4), 2 input terminals, and 1 output terminal, wherein the first switches (SW 2 to SW 4) in fig. 5-1 operate in the same manner as the first switches (SW 2 to SW 4) in fig. 3-2; the difference is that when the charger cannot provide 3S charging voltage and can only provide 2S charging voltage, it is necessary to ensure that the first end a of the first switch (SW 1) is connected with the second end b of the first switch, and it is necessary to ensure that the first end a of the third first switch (SW 3) is connected with the third end c of the third switch; thus, the second battery pack and the third battery pack B3 constitute a series connection structure, so that the second battery pack and the third battery pack B3 can be charged using a 2S charger. When discharging is performed by using the second battery pack and the third battery pack B3, it is necessary to connect the first terminal a of the first switch (SW 1) to the second terminal c thereof, and to connect the first terminal a of the second first switch (SW 1) to the second terminal c thereof; thus, second battery pack and third battery pack B3 constitute a parallel connection structure. It should be noted that, when the power circuit is charged, the first end a of the first switch (SW 1) is connected to the second end B thereof, the first end a of the third first switch (SW 3) is connected to the second end B thereof, and the first end a of the fourth first switch (SW 4) is connected to the second end c thereof, so that the 2S charger applies a reverse voltage to the first battery pack B1, and since the voltage provided by the 2S charger is certainly greater than the voltage provided by the 1S charger, the first battery pack B1 is damaged to the first battery pack B1; to avoid this, a diode may be added between the second terminal b of the third first switch (SW 3) and the second terminal b of the first switch (SW 1) to prevent current from flowing from the second terminal b of the first switch (SW 1) to the second terminal b of the third first switch (SW 3), i.e., the second terminal b of SW1 → the second terminal b of SW3, wherein the arrows indicate the flowing direction of the current.

The first switch SW1 of fig. 5-1 may also be a second switch, as shown in fig. 5-2, and a diode may be added to the second terminal B of SW3 to the second battery B2 in order to avoid applying a reverse voltage to the first battery, i.e., to avoid a current from the input terminal of 2S to the second terminal B of the third first switch (SW 3), i.e., the input terminal of 2S → the second terminal B of SW3, wherein an arrow indicates the current flow.

The technical scheme provided by the embodiment of the invention can be used in the following scenes, and the output voltage of the charger is 9V under the condition that the power supply circuit with the 3S2P structure is normal; however, when a user forgets to take the charger when going out, and the voltage of the charger that can be found at hand is 6V, the user can change the input voltage of the power supply circuit to switch from the original 9V to 6V.

In a specific implementation process, the power circuit provided by the embodiment of the invention may further include a mechanical switch, which is more convenient for a user to select the input voltage of 3S or the input voltage of 2S for the power circuit; of course, the function of the mechanical switch can also be implemented in software to automatically detect whether the inserted charger provides a 3S or 2S input voltage. It should be noted that, although fig. 5-1 and 5-2 take the example of switching 3S to 2S as an example, it should be understood by those skilled in the art that the 4S power circuit shown in fig. 3-3 may be modified to be compatible with both 3S and 2S power circuits in a manner similar to that of fig. 5-1; the 5S power supply circuit shown in FIGS. 3-4 may be modified in a manner similar to that of FIG. 5-1 to accommodate 4S, 3S and 2S power supply circuits simultaneously; for brevity and economy of disclosure, further description is not provided herein.

EXAMPLE six

In the power circuit provided above, the batteries in different battery packs have the same chemical characteristics, and the present embodiment provides a battery with different chemical characteristics that can be used for different battery packs. Fig. 6 is a schematic diagram of a sixth power circuit according to an embodiment of the present invention, as shown in fig. 6, the power circuit includes 4 sets of battery packs (B1 to B4) and 4 first switches (SW 1 to SW 4), each of the four first switches has a first end a, a second end B and a third end c, wherein the first end a of each of the four first switches can be communicated with the second end B of the first switch or the third end c of the first switch; wherein:

the positive pole of the 1 st battery pack B1 of the 4 battery packs is connected with the first end a of a 1 st first switch SW1, the second end B of the 1 st first switch SW1 is connected with the input end 110 of the power supply circuit, and the third end c of the 1 st first switch SW1 is connected with the output end 120 of the power supply circuit;

the negative electrode of the 1 st battery pack B1 of the 4 battery packs is connected with the first end a of the 2 nd first switch SW2 of the 4 first switches, the second end B of the 2 nd first switch SW2 is connected with the positive electrode of the 2 nd battery pack B2 of the 4 battery packs, and the third end c of the 2 nd first switch SW2 is connected with the negative electrode of the 2 nd battery pack B2;

the positive pole of the group 2 battery pack B2 is connected with the output end 120 of the power circuit;

the positive pole of the 3 rd battery pack B3 of the 4 battery packs is connected with the first end a of a 3 rd first switch SW3, the second end B of the 3 rd first switch SW3 is connected with the input end 120 of the power supply circuit, and the third end c of the 3 rd first switch SW3 is connected with the output end 120 of the power supply circuit;

the negative electrode of the 3 rd group battery pack B3 of the 4 group battery packs is connected with the first end a of the 4 th first switch SW4 of the 4 first switches, the second end B of the 4 th first switch SW4 is connected with the positive electrode of the 4 th group battery pack B4 of the 4 group battery packs, and the third end c of the 4 th first switch SW4 is connected with the negative electrode of the 4 th group battery pack B4;

the positive pole of the group 4 battery pack B4 is connected to the output terminal 120 of the power circuit.

In the embodiment of the present invention, the power circuit may further include a ground terminal for connecting the power circuit to ground.

In the embodiment of the present invention, when the power circuit shown in fig. 6 operates, the connection mode is as follows: when the power supply circuit shown in fig. 6 is charged, the first battery pack B1 and the second battery pack B2 are connected in series, and the third battery pack B3 and the fourth battery pack B4 are connected in series; when the power supply circuit shown in fig. 6 is discharged, first battery pack B1 and second battery pack B2 are connected in parallel, and third battery pack B3 and fourth battery pack B4 are connected in parallel.

Based on the foregoing power supply circuit, the present invention further provides a method for operating a power supply circuit, where the method is applied to charging the power supply circuit, and functions implemented by the method may be implemented by a processor in an electronic device calling a program code, where the program code may be stored in a computer storage medium. The method comprises the following steps:

Based on the foregoing power supply circuit, the present invention further provides a method for operating a power supply circuit, where when the method is applied to a power supply circuit for discharging, a function implemented by the method may be implemented by a processor in an electronic device calling a program code, and the program code may be stored in a computer storage medium. The method comprises the following steps:

Based on the foregoing power circuit, the present invention further provides an electronic device, in which the first connection unit, the second connection unit, and the third connection unit can be implemented by a processor in the electronic device; of course, the implementation can also be realized through a specific logic circuit; in the course of a particular embodiment, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like. The electronic device comprises a first connecting unit, a second connecting unit and a third connecting unit, wherein:

Based on the foregoing power circuit, the present invention further provides an electronic device, where the fourth connection unit, the fifth connection unit, and the sixth connection unit in the electronic device can be implemented by a processor in the electronic device; of course, the implementation can also be realized through a specific logic circuit; in the course of a particular embodiment, the processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or the like.

The electronic device comprises four connecting units, a fifth connecting unit and a sixth connecting unit, wherein:

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.

Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A power supply circuit characterized in that an input voltage of the power supply circuit when charging is different from an output voltage of the power supply circuit when discharging, the power supply circuit comprising: an input terminal, an output terminal, a plurality of groups of battery packs and a plurality of switches, wherein,

the output end is used for supplying power to the electronic equipment;

the plurality of switches include two or more switches; the plurality of switches are used for enabling the connection relation among the plurality of groups of battery packs to be converted between series connection and parallel connection;

the power supply circuit comprises 3 groups of battery packs, 3 first switches and 1 second switch, wherein:

the positive electrode of the 1 st group of battery packs in the 3 groups of battery packs is connected with the first end of the 1 st first switch in the 3 first switches, the second end of the 1 st first switch is connected with the 1 st input end of the power supply circuit, and the third end of the 1 st first switch is connected with the output end of the power supply circuit;

the negative electrode of the 1 st battery pack in the 3 groups of battery packs is connected with the first end of the 2 nd first switch, the second end of the 2 nd first switch is connected with the second end of the 1 st second switch, the third end of the 2 nd first switch is connected with the ground, the positive electrode of the 2 nd battery pack is connected with the first end of the 1 st second switch, the second end of the 1 st second switch is connected with the 2 nd input end of the power supply circuit, and the third end of the 1 st second switch is connected with the output end of the power supply circuit;

the negative electrode of the 2 nd group battery pack in the 3 groups of battery packs is connected with the first end of a 3 rd first switch, the second end of the 3 rd first switch is connected with the positive electrode of the 3 rd group battery pack, and the third end of the 3 rd first switch is connected with the ground;

and the positive electrode of the 3 rd group battery pack is connected with the output end of the power supply circuit.

2. The power supply circuit of claim 1, wherein the plurality of switches are configured to connect the plurality of battery packs in series when the power supply circuit is charged; and when the power supply circuit discharges, the multiple groups of battery packs are connected in parallel.

3. The power supply circuit according to claim 1, further comprising a controller for preventing two or more sets of battery packs from charging each other.

4. The power supply circuit of claim 3, wherein the controller comprises three diodes, wherein: the 1 st diode in the three diodes is located between the positive pole of the 1 st group battery pack and the output end of the power supply circuit, the 2 nd diode in the three diodes is located between the positive pole of the 2 nd group battery pack and the output end of the power supply circuit, and the 3 rd diode in the three diodes is located between the positive pole of the 3 rd group battery pack and the output end of the power supply circuit.

5. A method of operating a power supply circuit as claimed in claim 1, the method comprising:

6. A method of operating a power supply circuit as claimed in claim 1, the method comprising:

connecting the positive electrode of the 1 st battery pack in the N battery packs in the power circuit with the positive electrode of the Nth battery pack in the N battery packs;

connecting the negative electrode of the (j-1) th group of battery packs in the N groups of battery packs with the negative electrode of the j group of battery packs in the N groups of battery packs, wherein j is an integer which is more than or equal to 2 and less than or equal to (N-1);

7. An electronic device characterized in that the electronic device includes the power supply circuit according to claim 1, the electronic device further including a first connection unit, a second connection unit, and a third connection unit, wherein:

8. An electronic device characterized in that the electronic device includes the power supply circuit according to claim 1, the electronic device further including a fourth connection unit, a fifth connection unit, and a sixth connection unit, wherein:

the fourth connecting unit is used for connecting the positive electrode of the 1 st group of battery packs in the N groups of battery packs in the power circuit with the positive electrode of the N groups of battery packs in the N groups of battery packs;

the fifth connecting unit is used for connecting the negative electrode of the (j-1) th group of battery packs in the N groups of battery packs with the negative electrode of the j group of battery packs in the N groups of battery packs, wherein j is an integer which is greater than or equal to 2 and less than or equal to (N-1);