Double-circuit battery switching circuit, battery box and portable oxygen generator

Abstract

The utility model relates to a two-way battery switching circuit, a battery box and a portable oxygen generator, and relates to the technical field of electronics, the two-way battery switching circuit comprises a first battery, a second battery, a first switching circuit, a second switching circuit and a control circuit; the first switching circuit is electrically connected with the first battery, the first switching circuit is electrically connected with the control circuit, and the voltage output end of the first switching circuit serves as one output port of the dual-path battery switching circuit; the first switching circuit is used for switching to the first battery to supply power to the outside; the second switching circuit is electrically connected with the second battery, the second switching circuit is electrically connected with the control circuit, and the voltage output end of the second switching circuit serves as the other output port of the two-way battery switching circuit; the second switching circuit is used for switching to the second battery to supply power to the outside; the control circuit is used for acquiring state information of the first battery and the second battery and selecting one battery to supply power to the outside. The cruising ability can be improved, and overheating of a single battery group during long-term working is avoided.

Description

Technical Field

[0001] The present application relates to the field of electronic technology, and in particular to a dual-battery switching circuit, a control method, a battery box, and a portable oxygen concentrator. Background Art

[0002] With the development of the medical industry, miniaturized and portable electronic devices have become widely used. For example, portable oxygen concentrators are small, lightweight devices used to provide supplemental oxygen. Due to their portability, ease of operation, and convenient maintenance, portable oxygen concentrators are increasingly popular among users.

[0003] Portable electronic devices are typically battery-powered, and their continuous operation is limited by the battery's lifespan. Portable medical electronic devices, however, typically use a single battery due to size constraints. However, a single battery has limited capacity, and prolonged operation can easily cause the battery to heat up significantly, impacting the device's performance. Utility Model Content

[0004] The present application provides a dual-battery switching circuit, a control method, a battery box, and a portable oxygen concentrator to solve the problem that current single-group battery devices have limited battery life and are prone to severe battery temperature rise due to prolonged operation.

[0005] In a first aspect, an embodiment of the present application provides a dual-battery switching circuit, comprising: a first battery, a second battery, a first switching circuit, a second switching circuit, and a control circuit;

[0006] The voltage input terminal of the first switching circuit is electrically connected to the first battery, the control terminal of the first switching circuit is electrically connected to the control circuit, and the voltage output terminal of the first switching circuit serves as one output port of the dual-battery switching circuit; the first switching circuit is configured to switch to the first battery for external power supply under the control of the control circuit;

[0007] The voltage input terminal of the second switching circuit is electrically connected to the second battery, the control terminal of the second switching circuit is electrically connected to the control circuit, and the voltage output terminal of the second switching circuit serves as another output port of the dual-battery switching circuit; the second switching circuit is configured to switch to the second battery for external power supply under the control of the control circuit;

[0008] The control circuit is further electrically connected to the first battery and the second battery respectively, and is used to obtain status information of the first battery and the second battery respectively, and select a battery to supply external power according to the status information.

[0009] Optionally, the first switching circuit includes a first field effect transistor and a second field effect transistor, the first field effect transistor and the second field effect transistor are connected in reverse series; the first field effect transistor and the second field effect transistor are of the same type;

[0010] The first electrode of the first field effect transistor is electrically connected to the first battery; the control electrode of the first field effect transistor is electrically connected to the control circuit; and the second electrode of the first field effect transistor is also electrically connected to the second electrode of the second field effect transistor;

[0011] The control electrode of the second field effect transistor is electrically connected to the control circuit; the first electrode of the second field effect transistor serves as an output port of the dual-battery switching circuit;

[0012] The first field effect transistor and the second field effect transistor are used to be turned on under the control of the control circuit, so that the first battery can supply power to the outside.

[0013] Optionally, the second switching circuit includes a third field effect transistor and a fourth field effect transistor, the third field effect transistor and the fourth field effect transistor are connected in reverse series; the third field effect transistor and the fourth field effect transistor are of the same type;

[0014] The first electrode of the third field effect transistor is electrically connected to the second battery; the control electrode of the third field effect transistor is electrically connected to the control circuit; the second electrode of the third field effect transistor is electrically connected to the second electrode of the fourth field effect transistor;

[0015] The control electrode of the fourth field effect transistor is electrically connected to the control circuit; the first electrode of the fourth field effect transistor serves as another output port of the dual-battery switching circuit;

[0016] The third field effect transistor and the fourth field effect transistor are used to be turned on under the control of the control circuit, so that the second battery can supply power to the outside.

[0017] Optionally, the control circuit includes a first output terminal and a second output terminal; the first switching circuit further includes: a first triode, a second triode and a third triode; the first triode, the second triode and the third triode are of the same type;

[0018] The first electrode of the first transistor is electrically connected to the control electrode of the first field effect transistor; the control electrode of the first transistor is electrically connected to the first output terminal; the second electrode of the first transistor is used to receive a power supply voltage signal with a first level; wherein the first level is a signal level corresponding to when the first field effect transistor is turned on;

[0019] The first electrode of the second transistor is electrically connected to the control electrode of the second field effect transistor, and the control electrode of the second transistor is electrically connected to the first electrode of the third transistor; the second electrode of the second transistor is used to receive the power supply voltage signal with the first level;

[0020] The control electrode of the third transistor is electrically connected to the second output end; the second electrode of the third transistor is used to receive a power supply voltage signal with a second level; wherein the second level is a signal level corresponding to when the second transistor is turned off.

[0021] Optionally, the control circuit includes a first output terminal and a second output terminal; the second switching circuit further includes: a fourth transistor, a fifth transistor, and a sixth transistor; the fourth transistor, the fifth transistor, and the sixth transistor are of the same type;

[0022] The first electrode of the fourth transistor is electrically connected to the control electrode of the third field-effect transistor; the control electrode of the fourth transistor is electrically connected to the second output terminal; the second electrode of the fourth transistor is used to receive a power supply voltage signal having a third level; wherein the third level is a signal level corresponding to when the third field-effect transistor is turned on;

[0023] The first electrode of the fifth transistor is electrically connected to the control electrode of the fourth field effect transistor, and the control electrode of the fifth transistor is electrically connected to the first electrode of the sixth transistor; the second electrode of the fifth transistor is used to receive the power supply voltage signal of the third level;

[0024] The control electrode of the sixth transistor is electrically connected to the first output end; the second electrode of the sixth transistor is used to receive a power supply voltage signal with a fourth level; wherein the fourth level is the signal level corresponding to when the fifth transistor is turned off.

[0025] Optionally, the dual-battery switching circuit further includes a main power supply circuit;

[0026] The input end of the main power supply circuit is electrically connected to the voltage output end of the first switching circuit and the voltage output end of the second switching circuit respectively, the control end of the main power supply circuit is electrically connected to the control circuit, and the output end of the main power supply circuit serves as the power supply output end of the dual-battery switching circuit;

[0027] The main power supply circuit is used to control the dual-battery switching circuit to completely cut off power under the control of the control circuit.

[0028] Optionally, the main power supply circuit includes a fifth field effect transistor, a sixth field effect transistor and a seventh transistor;

[0029] The first electrode of the fifth field-effect transistor is electrically connected to the voltage output terminal of the first switching circuit and the voltage output terminal of the second switching circuit, respectively; the second electrode of the fifth field-effect transistor is electrically connected to the first electrode of the sixth field-effect transistor; and the control electrode of the fifth field-effect transistor is used to receive a power supply voltage signal having a fifth level, where the fifth level is a signal level corresponding to when the fifth field-effect transistor is turned on.

[0030] The control electrode of the sixth field effect transistor is electrically connected to the first electrode of the seventh transistor; the second electrode of the sixth field effect transistor serves as the power supply output end;

[0031] The control electrode of the seventh transistor is electrically connected to the control circuit; the second electrode of the seventh transistor is used to receive a power supply voltage signal with a sixth level, and the sixth level is the signal level corresponding to when the sixth field effect transistor is turned on.

[0032] Optionally, the main power supply circuit further includes a first diode and a key switch;

[0033] The anode of the first diode is electrically connected to the control electrode of the sixth field-effect transistor and the first electrode of the seventh transistor respectively, and the cathode of the first diode is electrically connected to the first end of the key switch; the second end of the key switch is used to receive the power supply voltage signal with the sixth level.

[0034] In a second aspect, an embodiment of the present application provides a battery box, which includes the dual-path battery switching circuit as described in the first aspect.

[0035] In a third aspect, an embodiment of the present application provides a portable oxygen concentrator, comprising the battery box as described in the second aspect.

[0036] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects:

[0037] In the embodiment of the present application, by providing corresponding first and second switching circuits for the first and second batteries, the control circuit can control the first and second switching circuits to switch between the first and second batteries based on the status information of the first and second batteries, thereby selecting one battery to supply external power. Compared to single-battery devices in the related art, this can improve battery life and avoid overheating caused by long-term operation of a single battery pack.

[0038] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings herein are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application and do not constitute an improper limitation on the present application.

[0040] Figure 1 is a structural diagram of a dual-battery switching circuit according to an exemplary embodiment;

[0041] Figure 2 is a structural diagram of a first switching circuit according to an exemplary embodiment;

[0042] Figure 3 is a structural diagram of a second switching circuit according to an exemplary embodiment;

[0043] Figure 4 is a structural schematic diagram of another dual-battery switching circuit according to an exemplary embodiment;

[0044] Figure 5 The figure is a schematic structural diagram of a main power supply circuit according to an exemplary embodiment. DETAILED DESCRIPTION

[0045] In order to enable ordinary people in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0046] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0047] Figure 1 FIG. 1 is a structural diagram of a dual-battery switching circuit 10 according to an exemplary embodiment. Figure 1 As shown, the dual-battery switching circuit 10 includes: a first battery 101, a second battery 102, a first switching circuit 103, a second switching circuit 104 and a control circuit 105;

[0048] The voltage input terminal of the first switching circuit 103 is electrically connected to the first battery 101, the control terminal of the first switching circuit 103 is electrically connected to the control circuit 105, and the voltage output terminal of the first switching circuit 103 serves as one output port of the dual-battery switching circuit 10; the first switching circuit 103 is used to switch to the first battery 101 for external power supply under the control of the control circuit 105;

[0049] The voltage input terminal of the second switching circuit 104 is electrically connected to the second battery 102, the control terminal of the second switching circuit 104 is electrically connected to the control circuit 105, and the voltage output terminal of the second switching circuit 104 serves as another output port of the dual-battery switching circuit 10; the second switching circuit 104 is used to switch to the second battery 102 for external power supply under the control of the control circuit 105;

[0050] The control circuit 105 is also electrically connected to the first battery 101 and the second battery 102 respectively, and is used to obtain status information of the first battery 101 and the second battery 102 respectively, and select a battery to supply external power according to the status information.

[0051] In some embodiments, the dual-battery switching circuit 10 can be applied to miniaturized, portable medical electronic devices, such as portable ventilators and portable oxygen concentrators. The first battery 101 and the second battery 102 can be two battery packs, and the first battery 101 and the second battery 102 can be the same or different models. The battery packs are, for example, 4S2P battery packs or 4S1P battery packs. A 4S2P battery pack has eight cells, divided into two groups, with four cells each connected in series, and then connected in parallel to form two groups, resulting in a 4S2P battery pack.

[0052] In some embodiments, the control circuit 105 can be a specially constructed logic control circuit, or a control chip such as a microcontroller unit (MCU). The control circuit 105 can communicate with the first battery 101 and the second battery 102 respectively to obtain status information such as the remaining capacity, voltage, current, and temperature of the batteries, and then select the battery with the better current status to supply power based on the status information, so that the other group of batteries has a short recovery period. For example, if the temperature rise of any group of batteries is too high, the control circuit 105 can select another group of batteries to improve the safety of the batteries. This is only an example, and the embodiments of the present application are not limited to this.

[0053] Optionally, the first switching circuit 103 includes a first field effect transistor 1031 and a second field effect transistor 1032 , the first field effect transistor 1031 and the second field effect transistor 1032 are connected in reverse series; the first field effect transistor 1031 and the second field effect transistor 1032 are of the same type;

[0054] The first electrode of the first field effect transistor 1031 is electrically connected to the first battery 101; the control electrode of the first field effect transistor 1031 is electrically connected to the control circuit; the second electrode of the first field effect transistor 1031 is also electrically connected to the second electrode of the second field effect transistor 1032;

[0055] The control electrode of the second field effect transistor 1032 is electrically connected to the control circuit 105; the first electrode of the second field effect transistor 1032 serves as one output port of the dual-battery switching circuit;

[0056] The first field effect transistor 1031 and the second field effect transistor 1032 are used to be turned on under the control of the control circuit, so that the first battery 101 can supply power to the outside.

[0057] In some embodiments, the first field-effect transistor 1031 and the second field-effect transistor 1032 in the first switching circuit 103 form a set of switches. When the first field-effect transistor 1031 and the second field-effect transistor 1032 are turned on, power is supplied to the outside by the first battery 101. The first field-effect transistor 1031 and the second field-effect transistor 1032 are of the same type, and the second electrode of the first field-effect transistor 1031 is also electrically connected to the second electrode of the second field-effect transistor 1032. Therefore, the first field-effect transistor 1031 and the second field-effect transistor 1032 are connected in reverse series, exhibiting the unidirectional conduction characteristics of a diode, thereby preventing current backflow.

[0058] In the embodiment of the present application, by connecting the first field-effect transistor 1031 and the second field-effect transistor 1032 of the same type in reverse series, a switch can be used. When the first field-effect transistor 1031 is turned on under the control of the control circuit 105, the first battery 101 can supply power to the outside, and when the first field-effect transistor 1032 is turned off, the current backflow is prevented, thereby improving the safety of the first battery 101.

[0059] Optionally, the second switching circuit 104 includes a third field effect transistor 1041 and a fourth field effect transistor 1042, the third field effect transistor 1041 and the fourth field effect transistor 1042 are connected in reverse series; the third field effect transistor 1041 and the fourth field effect transistor 1042 are of the same type;

[0060] The first electrode of the third field effect transistor 1041 is electrically connected to the second battery 102; the control electrode of the third field effect transistor 1041 is electrically connected to the control circuit; the second electrode of the third field effect transistor 1041 is electrically connected to the second electrode of the fourth field effect transistor 1042;

[0061] The control electrode of the fourth field effect transistor 1042 is electrically connected to the control circuit; the first electrode of the fourth field effect transistor 1042 serves as another output port of the dual-battery switching circuit;

[0062] The third field effect transistor 1041 and the fourth field effect transistor 1042 are used to be turned on under the control of the control circuit, so that the second battery 102 can supply power to the outside.

[0063] In some embodiments, the third field-effect transistor 1041 and the fourth field-effect transistor 1042 in the second switching circuit 104 form a set of switches, and when the switches are turned on, the second battery 102 supplies power to the outside. The third field-effect transistor 1041 and the fourth field-effect transistor 1042 are of the same type, and the second electrode of the third field-effect transistor 1041 is also electrically connected to the second electrode of the fourth field-effect transistor 1042. Therefore, the third field-effect transistor 1041 and the fourth field-effect transistor 1042 are connected in reverse series, exhibiting the unidirectional conduction characteristics of a diode, thereby preventing current backflow.

[0064] In this way, leakage of electricity from the external circuit to the first battery 101 and the second battery 102 can be avoided, and the first battery 101 and the second battery 102 are not conductive to each other, thereby improving the safety of the first battery 101 and the second battery 102.

[0065] In some embodiments, the first field effect transistor 1031, the second field effect transistor 1032, the third field effect transistor 1041, and the fourth field effect transistor 1042 can be metal oxide semiconductor (MOS) field effect transistors, i.e., MOS transistors. The first field effect transistor 1031 and the second field effect transistor 1032 can be NMOS or PMOS of the same type, and the third field effect transistor 1041 and the fourth field effect transistor 1042 can be NMOS or PMOS of the same type, and the embodiments of the present application are not limited to this. The control pole of the MOS transistor is the gate, the NMOS is valid at a high level, and the PMOS is valid at a low level. The control circuit 105 can control the NMOS to be turned on by sending a high level signal to the gate of the NMOS and control the PMOS to be turned on by sending a low level signal to the gate of the PMOS. This is only an example, and the embodiments of the present application are not limited to this.

[0066] In the embodiment of the present application, by connecting the third field-effect transistor 1041 and the fourth field-effect transistor 1042 of the same type in reverse series, a switch can be used. When the switch is turned on under the control of the control circuit 105, the second battery 102 is powered externally. When the switch is turned off, current backflow is prevented, thereby improving the safety of the second battery 102.

[0067] In some embodiments, the control circuit 105 can control whether the field effect transistor is turned on by controlling the transistor. This is because the voltage required to control the conduction of the transistor is low, for example, 0.3 to 0.6V, while the voltage required to control the conduction of the field effect transistor, such as the metal oxide semiconductor (MOS) field effect transistor, is high, generally requiring 3V to 5V.

[0068] Optionally, the control circuit 105 includes a first output terminal 1051 and a second output terminal 1052; the first switching circuit 103 further includes: a first triode 1033, a second triode 1034 and a third triode 1035; the first triode 1033, the second triode 1034 and the third triode 1035 are of the same type;

[0069] The first electrode of the first transistor 1033 is electrically connected to the control electrode of the first field effect transistor 1031; the control electrode of the first transistor 1033 is electrically connected to the first output terminal 1051; the second electrode of the first transistor 1033 is used to receive a power supply voltage signal having a first level; wherein the first level is the signal level corresponding to when the first field effect transistor 1031 is turned on;

[0070] The first electrode of the second transistor 1034 is electrically connected to the control electrode of the second field effect transistor 1032, and the control electrode of the second transistor 1034 is electrically connected to the first electrode of the third transistor 1035; the second electrode of the second transistor 1034 is used to receive a power supply voltage signal with a first level;

[0071] The control electrode of the third transistor 1035 is electrically connected to the second output terminal 1052; the second electrode of the third transistor 1035 is used to receive a power supply voltage signal with a second level; wherein the second level is a signal level corresponding to when the second transistor 1034 is turned off.

[0072] In some embodiments, the control circuit 105 includes a first output terminal 1051 and a second output terminal 1052 . The control circuit 105 can output two control signals through the first output terminal 1051 and the second output terminal 1052 . The control signals have two level states: high level and low level.

[0073] In some embodiments, a first transistor 1033 is provided between the first output terminal 1051 of the control circuit 105 and the first field effect transistor 1031. The first transistor 1033 functions as a switch. The control electrode of the first transistor 1033 is connected to the first output terminal 1051, the first electrode is connected to the control electrode of the first field effect transistor 1031, and the second electrode can be connected to the first power supply terminal.

[0074] The first power supply terminal can provide a power supply voltage signal having a first level, where the first level is a signal level corresponding to when the first field effect transistor 1031 is turned on. When the control circuit 105 controls the first transistor 1033 to be turned on, the first power supply terminal can provide the power supply voltage signal having the first level to the first field effect transistor 1031, thereby controlling the first field effect transistor 1031 to be turned on.

[0075] In some embodiments, a second transistor 1034 and a third transistor 1035 are provided between the second output terminal 1052 of the control circuit 105 and the second field-effect transistor 1032. The second transistor 1034 and the third transistor 1035 function as switches. The control electrode of the third transistor 1035 is connected to the second output terminal 1052, the first electrode is electrically connected to the control electrode of the second transistor 1034, and the second electrode can be connected to the second power supply terminal.

[0076] The second power supply terminal can provide a power supply voltage signal having a second level, where the second level is a signal level corresponding to when the second transistor 1034 is turned off. When the control circuit 105 controls the third transistor 1035 to be turned on, the second power supply terminal can provide the power supply voltage signal having the second level to the second transistor 1034, thereby controlling the second transistor 1034 to be turned off.

[0077] In some embodiments, the control electrode of the second transistor 1034 can also be electrically connected to a constant voltage source, turning on under the control of the constant voltage. Only when the third transistor 1035 is turned on does the control electrode of the second transistor 1034 receive a power supply voltage signal having a second level and then turn off. Thus, when the control circuit 105 controls the third transistor 1035 to be turned on, the second transistor 1034 is turned off, thereby turning off the second field-effect transistor 1032. Otherwise, the second field-effect transistor 1032 remains in the on state.

[0078] In some embodiments, the first transistor 1033 , the second transistor 1034 and the third transistor 1035 are of the same type. Specifically, they may be NPN transistors or PNP transistors, which is not limited in the embodiments of the present application.

[0079] For example, the first transistor 1033, the second transistor 1034, and the third transistor 1035 are each NPN transistors. When the control signal transmitted from the first output terminal 1051 is at a high level, the first transistor 1033 is turned on, and the control electrode of the first field-effect transistor 1031 receives a power supply voltage signal having a first level, turning on the first field-effect transistor 1031. When the control signal transmitted from the first output terminal 1051 is at a low level, the first transistor 1033 is turned off, and the first field-effect transistor 1031 is turned off. When the control signal transmitted from the second output terminal 1052 is at a high level, the third transistor 1035 is turned on, and the base of the second transistor 1034 is pulled low, turning off the second transistor 1034 and, consequently, the second field-effect transistor 1032. When the control signal transmitted from the second output terminal 1052 is at a low level, the first transistor 1033 is turned off, and the second transistor 1034 is turned on, and, consequently, the second field-effect transistor 1032 is turned on. This is just an example, and the embodiments of the present application do not limit this.

[0080] In the embodiment of the present application, by providing a first transistor 1033, a second transistor 1034, and a third transistor 1035 of the same type in the first switching circuit 103, based on the connection relationship between the first transistor 1033 and the first field-effect transistor 1031, and the connection relationship between the second transistor 1034 and the third transistor 1035 and the second field-effect transistor 1032, it is possible to achieve that when the control signals output by the first output terminal 1051 and the second output terminal 1052 are signals of the same level, one of the two field-effect transistors is turned on and the other is turned off, and when the control signals are signals of opposite levels, the two field-effect transistors are turned on or turned off at the same time, so that the control circuit 105 can flexibly control the on or off state of the field-effect transistors, thereby improving the practicality of the dual-path battery switching circuit 10.

[0081] Figure 2 FIG. 1 is a structural diagram of a first switching circuit 103 according to an exemplary embodiment. Figure 2 As shown, the first field-effect transistor 1031 and the second field-effect transistor 1032 are PMOS transistors, and the first transistor 1033, the second transistor 1034, and the third transistor 1035 are NPN transistors. The drain of the first field-effect transistor 1031 (Q1) is electrically connected to the output terminal (VSYV_OUT-A) of the first battery 101, and the gate and source of the field-effect transistor Q1 are electrically connected via resistors R3 and R4. The source of the field-effect transistor Q1 is also electrically connected to the source of the second field-effect transistor 1032 (Q2). Field-effect transistors Q1 and Q2 are connected in reverse series. The body diode in field-effect transistor Q1 conducts from drain to source. When field-effect transistor Q1 is off and field-effect transistor Q2 is on, the presence of the body diode in field-effect transistor Q1 prevents external current from flowing back into the first battery 101, thereby improving the safety of the first battery 101. Resistors R3 and R4 are electrically connected to the collector of first transistor 1033 (N3) via resistor R9. The base of transistor N3 is electrically connected to first output terminal 1051 (CTRL_ON-1) via resistor R13, and can receive control signals from control circuit 105. The emitter of transistor N3 is grounded (GAND), and a resistor R17 is further connected between the base and emitter of transistor N3.

[0082] like Figure 2As shown, the gate of field-effect transistor Q2 is electrically connected to resistor R7, and the drain of field-effect transistor Q2 serves as the voltage output terminal VSYS_OUT of the first switching circuit 103. Resistor R7 is electrically connected to the collector of the second transistor 1034 (N1), and the collector of transistor N1 is also electrically connected to the source of field-effect transistor Q2 through resistor R1. The base of transistor N1 is electrically connected to the source of field-effect transistor Q2 through resistor R10. The base of transistor N1 is also electrically connected to the collector of the third transistor 1035 (N5), and the emitter of transistor N1 is grounded. The base of transistor N5 is electrically connected to the second output terminal 1052 (CTRL_ON-2) through resistor R14, and can receive the control signal sent by the control circuit 105. The emitter of transistor N5 is grounded, and resistor R18 is also connected between the base and emitter of transistor N5.

[0083] Optionally, the control circuit 105 includes a first output terminal 1051 and a second output terminal 1052; the second switching circuit 104 further includes: a fourth transistor 1043, a fifth transistor 1044 and a sixth transistor 1045; the fourth transistor 1043, the fifth transistor 1044 and the sixth transistor 1045 are of the same type;

[0084] A first electrode of the fourth transistor 1043 is electrically connected to a control electrode of the third field effect transistor 1041; the control electrode of the fourth transistor 1043 is electrically connected to the second output terminal 1052; a second electrode of the fourth transistor 1043 is configured to receive a power supply voltage signal having a third level; wherein the third level is a signal level corresponding to when the third field effect transistor 1041 is turned on;

[0085] A first electrode of the fifth transistor 1044 is electrically connected to the control electrode of the fourth field effect transistor 1042, and the control electrode of the fifth transistor 1044 is electrically connected to the first electrode of the sixth transistor 1045; a second electrode of the fifth transistor 1044 is used to receive a power supply voltage signal of a third level;

[0086] The control electrode of the sixth transistor 1045 is electrically connected to the first output terminal 1051; the second electrode of the sixth transistor 1045 is used to receive a power supply voltage signal with a fourth level; wherein the fourth level is a signal level corresponding to when the fifth transistor 1044 is turned off.

[0087] In the embodiment of the present application, a fourth transistor 1043 is provided between the second output terminal 1052 of the control circuit and the third field-effect transistor 1041. The fourth transistor 1043 functions as a switch. The control electrode of the fourth transistor 1043 is connected to the second output terminal 1052, the first electrode is connected to the control electrode of the third field-effect transistor 1041, and the second electrode can be connected to the third power supply terminal.

[0088] The third power supply terminal can provide a power supply voltage signal having a third level, which is a signal level corresponding to when the third field effect transistor 1041 is turned on. When the control circuit 105 controls the fourth transistor 1043 to be turned on, the third power supply terminal can provide the power supply voltage signal having the third level to the third field effect transistor 1041, thereby controlling the third field effect transistor 1041 to be turned on.

[0089] In some embodiments, a fifth transistor 1044 and a sixth transistor 1045 are provided between the first output terminal 1051 of the control circuit 105 and the fourth field-effect transistor 1042. The fifth transistor 1044 and the sixth transistor 1045 function as switches. The control electrode of the sixth transistor 1045 is connected to the first output terminal 1051, the first electrode is electrically connected to the control electrode of the fifth transistor 1044, and the second electrode can be connected to the fourth power supply terminal.

[0090] The fourth power supply terminal can provide a power supply voltage signal having a fourth level, which is a signal level corresponding to when the fifth transistor 1044 is turned off. When the control circuit 105 controls the sixth transistor 1045 to be turned on, the fourth power supply terminal can provide the power supply voltage signal having the fourth level to the fifth transistor 1044, thereby controlling the fifth transistor 1044 to be turned off.

[0091] In some embodiments, the control electrode of the fifth transistor 1044 can also be electrically connected to a constant voltage source, turning on under the control of the constant voltage. Only when the fifth transistor 1044 is turned on does the control electrode of the sixth transistor 1045 turn off upon receiving a power supply voltage signal having a second level. Thus, when the control circuit 105 controls the fifth transistor 1044 to be turned on, the sixth transistor 1045 is turned off, thereby turning off the fourth field-effect transistor 1042. Otherwise, the fourth field-effect transistor 1042 remains on.

[0092] In some embodiments, the fourth transistor 1043 , the fifth transistor 1044 and the sixth transistor 1045 are of the same type. Specifically, they may be NPN transistors or PNP transistors, which is not limited in the embodiments of the present application.

[0093] For example, the fourth transistor 1043, the fifth transistor 1044, and the sixth transistor 1045 are each NPN transistors. When the control signal transmitted from the first output terminal 1051 is at a high level, the sixth transistor 1045 is turned on, the base of the fifth transistor 1044 is pulled low, the fifth transistor 1044 is turned off, and the fourth field-effect transistor 1042 is turned on. When the control signal transmitted from the first output terminal 1051 is at a low level, the sixth transistor 1045 is turned off, the fifth transistor 1044 is turned on, and the fourth field-effect transistor 1042 is turned on. When the control signal transmitted from the second output terminal 1052 is at a high level, the fourth transistor 1043 is turned on, and the control electrode of the third field-effect transistor 1041 receives a power supply voltage signal at a third level, turning the third field-effect transistor 1041 on. When the control signal transmitted from the second output terminal 1052 is at a low level, the fourth transistor 1043 is turned off, and the third field-effect transistor 1041 is turned off.

[0094] In the embodiment of the present application, by providing a fourth transistor 1043, a fifth transistor 1044 and a sixth transistor 1045 of the same type in the first switching circuit 103, based on the connection relationship between the fourth transistor 1043 and the third field-effect transistor 1041, and the connection relationship between the fifth transistor 1044 and the sixth transistor 1045 and the fourth field-effect transistor 1042, it can be achieved that when the control signals output by the first output terminal 1051 and the second output terminal 1052 are signals of the same level, one of the two field-effect transistors is turned on and the other is turned off, and when the control signals are signals of opposite levels, the two field-effect transistors are turned on or turned off at the same time, so that the control circuit 105 can flexibly control the on or off state of the field-effect transistors, thereby improving the practicality of the dual-path battery switching circuit 10.

[0095] Figure 3 is a structural diagram of a second switching circuit 104 according to an exemplary embodiment. Figure 3As shown, the third field-effect transistor 1041 and the fourth field-effect transistor 1042 are PMOS transistors, respectively, and the fourth transistor 1043, the fifth transistor 1044, and the sixth transistor 1045 are NPN transistors. The drain of the third field-effect transistor 1041 (Q3) is electrically connected to the output terminal (VSYV_OUT-B) of the second battery 102, and the gate and source of the field-effect transistor Q3 are electrically connected via resistors R5 and R6. The source of the field-effect transistor Q3 is also electrically connected to the source of the fourth field-effect transistor 1042 (Q4). Field-effect transistors Q3 and Q4 are connected in reverse series. The body diode in field-effect transistor Q3 conducts from drain to source. Therefore, when field-effect transistor Q3 is off and field-effect transistor Q4 is on, the presence of the body diode in field-effect transistor Q3 prevents external current from flowing back into the second battery 102, thereby improving the safety of the second battery 102. Resistors R5 and R6 are electrically connected to the collector of fourth transistor 1043 (N4) via resistor R12. The base of transistor N4 is electrically connected to second output terminal 1052 (CTRL_ON-2) via resistor R13, and can receive control signals from control circuit 105. The emitter of transistor N4 is grounded, and resistor R19 is further connected between the base and emitter of transistor N4.

[0096] like Figure 3 As shown, the gate of field-effect transistor Q4 is electrically connected to resistor R8, and the drain of field-effect transistor Q4 serves as the output terminal VSYS_OUT of the second switching circuit 104. Resistor R8 is electrically connected to the collector of the fifth transistor 1044 (N2), and the collector of transistor N2 is also electrically connected to the source of Q4 through resistor R2. The base of transistor N2 is electrically connected to the source of Q4 through resistor R11, and the base of transistor N2 is also electrically connected to the collector of the sixth transistor 1045 (N6). The emitter of transistor N2 is grounded. The base of transistor N6 is electrically connected to the first output terminal 1051 (CTRL_ON-1) through resistor R16, and can receive the control signal sent by the control circuit 105. The emitter of transistor N6 is grounded, and a resistor R20 is further connected between the base and emitter of transistor N6.

[0097] Although the voltage required for the MOS tube to turn on is high, the MOS tube has a strong load capacity. The control circuit 105 can control the triode and then the MOS tube, which can reduce the requirements for the control circuit 105 and make it more versatile. Figure 2 As shown, the field effect tubes Q1 and Q2 are PMOS of the same type, such as Figure 3As shown, FETs Q3 and Q4 are the same type of PMOS transistors. The combination of FETs Q1, Q2, and Q3, Q4, provides both switch functionality and the unidirectional conductivity of a diode. This allows dual-battery switching to be achieved using only four PMOS transistors in conjunction with an MCU, resulting in a relatively low cost and suitable for compact, portable electronic devices.

[0098] Optionally, the dual-battery switching circuit 10 further includes a main power supply circuit 106;

[0099] The input end of the main power supply circuit 106 is electrically connected to the voltage output end of the first switching circuit 103 and the voltage output end of the second switching circuit 104 respectively. The control end of the main power supply circuit 106 is electrically connected to the control circuit 105. The output end of the main power supply circuit 106 serves as the power supply output end of the dual battery switching circuit 10.

[0100] The main power supply circuit 106 is used to control the dual-battery switching circuit 10 to completely cut off power under the control of the control circuit 105 .

[0101] In some embodiments, the output end of the main power supply circuit 106 can be connected to a power-consuming module, outputting the power supply voltage provided by the first battery 101 or the second battery 102 to the power-consuming module. The main power supply circuit 106 can also receive a control signal from the control circuit 105 to completely cut off the output path of the dual-battery switching circuit 10, thereby achieving on and off the main power supply, that is, realizing a true power-off function in the shutdown state.

[0102] In some embodiments, the first battery 101 may include a first communication interface, the second battery 102 may include a second communication interface, and the control circuit 105 may further include a first input terminal and a second input terminal. The first communication interface is electrically connected to the first input terminal, and the second communication interface is electrically connected to the second input terminal. The control circuit 105 can obtain status information such as the remaining capacity, voltage, current, and temperature of the first battery 101 and the second battery 102 through the first communication interface and the second communication interface, respectively, and then automatically switch the two batteries for time-sharing power supply through an intelligent algorithm to avoid a serious temperature rise of a single battery group due to long-term power supply. In addition, it can also allow the battery to have time to recover after high current power supply, making the dual-battery switching circuit 10 safer and more reliable.

[0103] Specifically, the first communication interface and the first input terminal can be connected through a first bus, and the second communication interface and the second input terminal can be connected through a second bus. The first bus and the second bus can be buses of the same type, or buses of different types. For example, a serial peripheral interface (SPI) bus or an integrated circuit bus (IIC) can be selected. This is only an example, and the embodiments of the present application do not limit this.

[0104] Taking a 4S1P battery pack as an example, the first battery 101 or the second battery 102 consists of four lithium-ion batteries connected in series, each with a nominal capacity of 3.2Ah and a nominal voltage of 3.6V. During normal operation, the MCU can obtain battery status information such as a capacity of 2000mAh, a voltage of 15.6V, a current of 3.6A, and a temperature of 43°C through the I2C interface.

[0105] Figure 4 FIG. 1 is a structural diagram of another dual-battery switching circuit 10 according to an exemplary embodiment. Figure 4 As shown, the first battery 101 and the second battery 102 form two groups of batteries in the battery pack. The first battery 101 is electrically connected to the first input terminal of the MCU via a first communication interface, and the second battery 102 is electrically connected to the second input terminal of the MCU via a second communication interface. The output terminal VSYS_OUT-A of the first battery 101 is electrically connected to the voltage input terminal of the first switching circuit 103, and the output terminal VSYS_OUT-B of the second battery 102 is electrically connected to the voltage input terminal of the second switching circuit 104. The output terminals VSYS_OUT of the first switching circuit 103 and the second switching circuit 104 are both electrically connected to the input terminal of the main power supply circuit 106. The first output terminal 1051 (CTRL_ON-1) and the second output terminal 1052 (CTRL_ON-2) of the MCU are electrically connected to the first switching circuit 103, and the first output terminal 1051 (CTRL_ON-1) and the second output terminal 1052 (CTRL_ON-2) are also electrically connected to the second switching circuit 104.

[0106] In an embodiment of the present application, by setting a main power supply circuit 106 in the dual-battery switching circuit 10, the power supply output of the dual-battery switching circuit 10 can be conveniently and completely cut off through the control circuit 105, so that the device is powered off and shut down, which can improve the practicality of the dual-battery switching circuit 10.

[0107] Optionally, the main power supply circuit 106 includes a fifth field effect transistor 1061 , a sixth field effect transistor 1062 and a seventh transistor 1063 ;

[0108] A first electrode of the fifth field-effect transistor 1061 is electrically connected to the voltage output terminal of the first switching circuit 103 and the voltage output terminal of the second switching circuit 104, respectively. A second electrode of the fifth field-effect transistor 1061 is electrically connected to the first electrode of the sixth field-effect transistor 1062. A control electrode of the fifth field-effect transistor 1061 is configured to receive a power supply voltage signal having a fifth level, which is a signal level corresponding to when the fifth field-effect transistor 1061 is turned on.

[0109] The control electrode of the sixth field effect transistor 1062 is electrically connected to the first electrode of the seventh transistor 1063; the second electrode of the sixth field effect transistor 1062 serves as a power supply output terminal;

[0110] The control electrode of the seventh transistor 1063 is electrically connected to the control circuit 105; the second electrode of the seventh transistor 1063 is used to receive a power supply voltage signal with a sixth level, which is the signal level corresponding to when the sixth field effect transistor 1062 is turned on.

[0111] In some embodiments, the fifth field effect transistor 1061 and the sixth field effect transistor 1062 can be used as switching transistors in the main power supply circuit 106 to control the on and off of the main power supply of the device. When the device is in the shutdown state, a true power outage can be achieved.

[0112] In some embodiments, the first electrode of the fifth field-effect transistor 1061 serves as the input terminal of the main power supply circuit 106 and is electrically connected to the voltage output terminals of the first switching circuit 103 and the second switching circuit 104, respectively. Specifically, the first electrode of the fifth field-effect transistor 1061 is electrically connected to the first electrode of the second field-effect transistor 1032 and the first electrode of the fourth field-effect transistor 1042, respectively. The second electrode of the fifth field-effect transistor 1061 is electrically connected to the first electrode of the sixth field-effect transistor 1062, that is, the fifth field-effect transistor 1061 and the sixth field-effect transistor 1062 are connected in series. The control electrode of the fifth field-effect transistor 1061 can be connected to the fifth power supply terminal.

[0113] The fifth power supply terminal can provide a power supply voltage signal having a fifth level, where the fifth level is a signal level corresponding to when the fifth field effect transistor 1061 is turned on. For example, if the fifth field effect transistor 1061 is a PMOS transistor, the fifth power supply terminal can be a ground terminal, and the fifth field effect transistor 1061 is turned on when the gate of the fifth field effect transistor 1061 is pulled low.

[0114] In some embodiments, the second terminal of the sixth field-effect transistor 1062 serves as the power output terminal of the dual-battery switching circuit 10 and can be electrically connected to the power-consuming module. A seventh transistor 1063 can be provided between the sixth field-effect transistor 1062 and the control circuit 105, so that the control circuit 105 controls the on / off switching of the sixth field-effect transistor 1062 by controlling the seventh transistor 1063.

[0115] Specifically, the control electrode of the seventh transistor 1063 is electrically connected to the control circuit 105 and can be electrically connected to the power control terminal of the control circuit 105, the first electrode is electrically connected to the control electrode of the sixth field effect transistor 1062, and the second electrode can be connected to the sixth power terminal.

[0116] The sixth power supply terminal can provide a power supply voltage signal having a sixth level, where the sixth level is a signal level corresponding to when the sixth field effect transistor 1062 is turned on. For example, if the sixth field effect transistor 1062 is a PMOS transistor, the sixth power supply terminal can be a ground terminal, and the gate of the sixth field effect transistor 1062 is pulled low, turning on the sixth field effect transistor 1062.

[0117] For example, the seventh transistor 1063 is an NPN transistor. When the power control signal sent by the power control terminal is at a high level, the seventh transistor 1063 is turned on, and the gate of the sixth field effect transistor 1062 is pulled low, turning on the sixth field effect transistor 1062. When the power control signal is at a low level, the seventh transistor 1063 is turned off, thereby controlling the sixth field effect transistor 1062 to be turned off.

[0118] In the embodiment of the present application, by arranging the fifth field-effect transistor 1061, the sixth field-effect transistor 1062 and the seventh transistor 1063 in the main power supply circuit, the advantages of the field-effect transistor's strong load capacity and the switching function can be utilized to better supply power to the power-consuming module and realize on-off control. The control circuit 105 can control the on-off of the seventh transistor 1063 through a smaller voltage, thereby conveniently controlling the on-off of the sixth field-effect transistor 1062, which can improve the practicality of the dual-path battery switching circuit 10.

[0119] Optionally, the main power supply circuit 106 further includes a first diode and a key switch;

[0120] The anode of the first diode is electrically connected to the control electrode of the sixth field effect transistor 1062 and the first electrode of the seventh transistor 1063 respectively, and the cathode of the first diode is electrically connected to the first end of the key switch; the second end of the key switch is used to receive a power supply voltage signal with a sixth level.

[0121] In some embodiments, the dual-battery switching circuit 10 may provide a power button. When the power button is pressed, the battery power is output, and the control circuit 105 automatically controls the dual-battery switching. Specifically, the control electrode of the sixth field-effect transistor 1062 is connected to the key switch via a first diode. When the key switch is pressed, the control electrode of the sixth field-effect transistor 1062 receives a power supply voltage signal having a sixth level, turning on the sixth field-effect transistor 1062, and the power supply is switched between the first switching circuit 103 and the second switching circuit 104.

[0122] Figure 5 FIG. 1 is a structural diagram of a main power supply circuit 106 according to an exemplary embodiment. Figure 5 As shown, the main power supply circuit 106 includes a fifth field-effect transistor 1061 (Q6), a sixth field-effect transistor 1062 (Q5), a seventh transistor 1063 (N7), a first diode (D1), and a key switch (KEY). The fifth field-effect transistor 1061 (Q6) and the sixth field-effect transistor 1062 (Q5) are PMOS transistors, respectively, and the seventh transistor 1063 (N7) is an NPN transistor. The source of field-effect transistor Q6 is electrically connected to the drain of field-effect transistor Q2 and the drain of field-effect transistor Q4, respectively. The drain of field-effect transistor Q6 is electrically connected to the source of field-effect transistor Q5. Filter capacitors C1 to C7 are also provided between field-effect transistors Q6 and Q5. The gate of field-effect transistor Q6 is grounded via resistor R24. Filter capacitor C8 and resistor R21 are also connected between the source and gate of field-effect transistor Q6. The gate of field-effect transistor Q5 is electrically connected to the collector of transistor N7 via resistors R23 and R26. The emitter of transistor N7 is grounded, and the base of transistor N7 is electrically connected to the power control terminal (CTRL_ON) to receive a power control signal from control circuit 105. The node between resistors R23 and R26 is connected to the source of field-effect transistor Q5 via resistors R25 and R22. The node is also electrically connected to the anode of diode D1, and the cathode of diode D1 is electrically connected to the key switch.

[0123] In the embodiment of the present application, by providing corresponding first switching circuits 103 and second switching circuits 104 for the first battery 101 and the second battery 102, the control circuit 105 can switch between the two battery groups by controlling the first switching circuit 103 and the second switching circuit 104 based on the status information of the first battery 101 and the second battery 102, thereby selecting either the first battery 101 or the second battery 102 to supply external power. Compared to single-battery devices in the related art, this device can improve battery life and avoid overheating caused by long-term operation of a single battery group.

[0124] In some embodiments, the control circuit 105 can obtain the remaining capacity, voltage, current, temperature and other status information of the first battery 101 and the second battery 102 through the first communication interface and the second communication interface respectively, that is, the first status information corresponding to the first battery 101 and the second status information corresponding to the second battery 102.

[0125] For example, the first status information corresponding to the first battery 101 may include the remaining capacity CA, the battery voltage VA, the battery current IA, and the battery temperature TA. The second status information corresponding to the second battery 102 may include the remaining capacity CB, the battery voltage VB, the battery current IB, and the battery temperature TB. This is merely an example and is not limited in the present embodiment.

[0126] In some embodiments, the first target battery is the battery with the better current status. The control circuit 105 can compare the first status information with the second status information and select the first target battery based on the comparison result. For example, when TA > TB, the second battery 102 is selected as the first target battery. When CA > CB or VA > VB, the first battery 101 is selected as the first target battery. This is merely an example and is not limited to the embodiments of the present application.

[0127] In some embodiments, the control circuit 105 can send a control signal having a first level to the first field-effect transistor 1031 and the second field-effect transistor 1032, causing the first field-effect transistor 1031 and the second field-effect transistor 1032 to be turned on, and the first switching circuit 103 switches to the first battery 101 for external power supply. The control circuit 105 can send a power supply voltage signal having a third level to the third field-effect transistor 1041 and the fourth field-effect transistor 1042, causing the third field-effect transistor 1041 and the fourth field-effect transistor 1042 to be turned on, and the second switching circuit 104 switches to the second battery 102 for external power supply.

[0128] In an embodiment of the present application, the control circuit 105 can respectively obtain the status information of the first battery 101 and the second battery 102, and thus select the battery with a better current status to supply power to the outside according to the status information. This can allow the other group of batteries to have a short recovery period, thereby improving the safety and endurance of the batteries.

[0129] In some embodiments, during the initial power-up phase of the dual-battery switching circuit 10, the first field-effect transistor 1031 and the second field-effect transistor 1032 in the first switching circuit 103, as well as the third field-effect transistor 1041 and the fourth field-effect transistor 1042 in the second switching circuit 104, all have the characteristics of unidirectional conduction and reverse blocking. The control circuit 105 can output a first default control signal and a second default control signal via the first output terminal 1051 and the second output terminal 1052, causing the first field-effect transistor 1031, the second field-effect transistor 1032, the third field-effect transistor 1041, and the fourth field-effect transistor 1042 to all conduct. At this time, the battery with the higher output voltage supplies power to the outside.

[0130] For example, Figures 2 to 5As shown, the first output terminal 1051 and the second output terminal 1052 of the MCU are at a default low level, that is, the first default control signal and the second default control signal are both at a low level during the initial power-up period. At this time, the PMOS transistor Q1 in the first switching circuit 103 and the PMOS transistor Q3 in the second switching circuit 104 are both turned off, while the PMOS transistor Q2 in the first switching circuit 103 and the PMOS transistor Q4 in the second switching circuit 104 are both turned on. However, due to the presence of body diodes in Q1 and Q3, the path with the higher output voltage of the first battery 101 and the second battery 102 can supply power to the outside. Even if the voltages of the first battery 101 and the second battery 102 are different, since Q1 and Q3 can be reversely cut off, there will be no conduction between the first battery 101 and the second battery 102, which can improve the safety of the first battery 101 and the second battery 102.

[0131] In some embodiments, when the dual-battery switching circuit 10 needs to be completely powered off, for example, when the control circuit 105 receives a shutdown signal from a device, the external power supply path of the first battery 101 and the second battery 102 can be disconnected by controlling the first switching circuit 103 and the second switching circuit 104, or the output path of the dual-battery switching circuit 10 can be directly cut off as a whole through the main power supply circuit 106 to realize the on and off of the main power supply. The embodiments of the present application do not limit this.

[0132] For example, refer to Figure 2 and Figure 3 When the first output terminal 1051 and the second output terminal 1051 output high-level control signals, that is, when CTRL_ON-1 and CTRL_ON-2 output high-level signals, the PMOS tubes Q1 and Q3 are turned on but Q2 and Q4 are turned off. In this way, the voltage output terminals of the first switching circuit 103 and the second switching circuit 104 cannot output voltage, that is, the external power supply paths of the first battery 101 and the second battery 102 are both disconnected. Figure 5 When the power control terminal (CTRL_ON) outputs a low level signal, the seventh transistor 1063 (N7) is turned off, and the sixth field effect transistor 1062 (Q5) is turned off, so that the main power supply circuit 106 stops supplying power to the outside.

[0133] In some embodiments, since the first switching circuit 103 is provided with the first transistor 1033, the second transistor 1034 and the third transistor 1035 of the same type, and the first switching circuit 103 is provided with the fourth transistor 1043, the fifth transistor 1044 and the sixth transistor 1045 of the same type, when the dual-battery switching control circuit 10 is in normal operation, the first output terminal 1051 and the second output terminal 1052 of the control circuit 105 are mutually exclusive outputs, that is, if one outputs a high-level signal, the other outputs a low-level signal. For example, referring to Figure 2 and Figure 3 As shown, the control signals sent by the MCU through the CTRL_ON-1 and CTRL_ON-2 terminals are mutually exclusive outputs, with only two output states: when CTRL_ON-1 is high, CTRL_ON-2 is low, or when CTRL_ON-1 is low, CTRL_ON-2 is high, so that at the same time, only one battery, namely the first target battery, supplies power to the outside.

[0134] In some embodiments, in order to prevent frequent switching between the first battery 101 and the second battery 102, a switching threshold parameter can be set. When the first comparison result meets the switching threshold parameter requirement, the switching control logic is executed to improve the safety and service life of the dual-battery switching circuit 10. Specifically, the parameter values in the first state information and the second state information can be subtracted, and the difference can be compared with the corresponding switching threshold parameter. When the difference is greater than the switching threshold parameter, the corresponding battery is determined as the first target battery. For example, the MCU can set the switching threshold parameter Xy, and the switching control logic will only be executed when TA-TB>X1, CA-CB>X2, or VA-VB>X3. This is just an example, and the embodiments of the present application are not limited to this.

[0135] Reference Figure 2 The first switching circuit 103 shown and Figure 3The second switching circuit 104 shown has the following operating states depending on the high / low levels of the control signals CTRL_ON-1 and CTRL_ON-2. In the initial power-up phase, CTRL_ON-1 and CTRL_ON-2 are both low, transistors N3 / N4 are off, MOS transistors Q1 / Q3 are off, transistors N5 / N6 are off, transistors N1 / N2 are on, and MOS transistors Q2 / Q4 are on. In this state, the higher voltage of the first battery 101 or the second battery 102 provides power. In the shutdown phase, CTRL_ON-1 and CTRL_ON-2 are both high, transistors N3 / N4 are on, MOS transistors Q1 / Q3 are on, transistors N5 / N6 are on, transistors N1 / N2 are off, and MOS transistors Q2 / Q4 are off. In this state, neither battery provides power. The first battery 101 supplies power, CTRL_ON-1 is at a high level, and CTRL_ON-2 is at a low level. Transistor N3 is turned on, transistor N4 is turned off, MOS transistor Q1 is turned on, MOS transistor Q3 is turned off, transistor N5 is turned off, transistor N6 is turned on, transistor N1 is turned on, transistor N2 is turned off, MOS transistor Q2 is turned on, and MOS transistor Q4 is turned off. The second battery 102 supplies power, CTRL_ON-1 is at a low level, and CTRL_ON-2 is at a high level. Transistor N3 is turned off, transistor N4 is turned on, MOS transistor Q1 is turned off, MOS transistor Q3 is turned on, transistor N5 is turned on, transistor N6 is turned off, transistor N1 is turned off, transistor N2 is turned on, MOS transistor Q2 is turned off, and MOS transistor Q4 is turned on.

[0136] An embodiment of the present application further provides a battery box, which includes the dual-path battery switching circuit 10 as described in the above embodiment.

[0137] An embodiment of the present application further provides a portable oxygen concentrator, which includes the battery box as described in the above embodiment.

[0138] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0139] Similarly, it should be understood that in order to streamline the present application and assist in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof.

[0140] Those skilled in the art will appreciate that the modules in the devices of the embodiments can be adaptively changed and placed in one or more devices different from the embodiments. The modules, units, or components in the embodiments can be combined into one module, unit, or component, and furthermore, they can be divided into multiple submodules, subunits, or subcomponents. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that provides the same, equivalent, or similar purpose.

[0141] It should be noted that the above embodiments illustrate rather than limit the present application, and that a person skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present application may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0142] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0143] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

[0144] It should be noted that the various data-related processes in the embodiments of the present application are all carried out in compliance with the corresponding data protection laws and policies of the country where they are located, and with the authorization given by the owner of the corresponding device.

Claims

1. A dual-battery switching circuit, characterized in that: include: a first battery, a second battery, a first switching circuit, a second switching circuit, and a control circuit; The voltage input terminal of the first switching circuit is electrically connected to the first battery, the control terminal of the first switching circuit is electrically connected to the control circuit, and the voltage output terminal of the first switching circuit serves as one output port of the dual-battery switching circuit; the first switching circuit is configured to switch to the first battery for external power supply under the control of the control circuit; The voltage input terminal of the second switching circuit is electrically connected to the second battery, the control terminal of the second switching circuit is electrically connected to the control circuit, and the voltage output terminal of the second switching circuit serves as another output port of the dual-battery switching circuit; the second switching circuit is configured to switch to the second battery for external power supply under the control of the control circuit; The control circuit is further electrically connected to the first battery and the second battery respectively, and is used to obtain status information of the first battery and the second battery respectively, and select a battery to supply external power according to the status information.

2. The dual-battery switching circuit according to claim 1, characterized in that: The first switching circuit includes a first field effect transistor and a second field effect transistor, the first field effect transistor and the second field effect transistor are connected in reverse series; the first field effect transistor and the second field effect transistor are of the same type; The first electrode of the first field effect transistor is electrically connected to the first battery; the control electrode of the first field effect transistor is electrically connected to the control circuit; and the second electrode of the first field effect transistor is also electrically connected to the second electrode of the second field effect transistor; The control electrode of the second field effect transistor is electrically connected to the control circuit; the first electrode of the second field effect transistor serves as an output port of the dual-battery switching circuit; The first field effect transistor and the second field effect transistor are used to be turned on under the control of the control circuit, so that the first battery can supply power to the outside.

3. The dual-battery switching circuit according to claim 1, characterized in that: The second switching circuit includes a third field effect transistor and a fourth field effect transistor, the third field effect transistor and the fourth field effect transistor are connected in reverse series; the third field effect transistor and the fourth field effect transistor are of the same type; The first electrode of the third field effect transistor is electrically connected to the second battery; the control electrode of the third field effect transistor is electrically connected to the control circuit; the second electrode of the third field effect transistor is electrically connected to the second electrode of the fourth field effect transistor; The control electrode of the fourth field effect transistor is electrically connected to the control circuit; the first electrode of the fourth field effect transistor serves as another output port of the dual-battery switching circuit; The third field effect transistor and the fourth field effect transistor are used to be turned on under the control of the control circuit, so that the second battery can supply power to the outside.

4. The dual-battery switching circuit according to claim 2, characterized in that: The control circuit includes a first output terminal and a second output terminal; the first switching circuit also includes: a first triode, a second triode and a third triode; the first triode, the second triode and the third triode are of the same type; The first electrode of the first transistor is electrically connected to the control electrode of the first field effect transistor; the control electrode of the first transistor is electrically connected to the first output terminal; the second electrode of the first transistor is used to receive a power supply voltage signal with a first level; wherein the first level is a signal level corresponding to when the first field effect transistor is turned on; The first electrode of the second transistor is electrically connected to the control electrode of the second field effect transistor, and the control electrode of the second transistor is electrically connected to the first electrode of the third transistor; the second electrode of the second transistor is used to receive the power supply voltage signal with the first level; The control electrode of the third transistor is electrically connected to the second output end; the second electrode of the third transistor is used to receive a power supply voltage signal with a second level; wherein the second level is a signal level corresponding to when the second transistor is turned off.

5. The dual-battery switching circuit according to claim 3, characterized in that: The control circuit includes a first output terminal and a second output terminal; the second switching circuit further includes: a fourth transistor, a fifth transistor and a sixth transistor; the fourth transistor, the fifth transistor and the sixth transistor are of the same type; The first electrode of the fourth transistor is electrically connected to the control electrode of the third field-effect transistor; the control electrode of the fourth transistor is electrically connected to the second output terminal; the second electrode of the fourth transistor is used to receive a power supply voltage signal having a third level; wherein the third level is a signal level corresponding to when the third field-effect transistor is turned on; The first electrode of the fifth transistor is electrically connected to the control electrode of the fourth field effect transistor, and the control electrode of the fifth transistor is electrically connected to the first electrode of the sixth transistor; the second electrode of the fifth transistor is used to receive the power supply voltage signal of the third level; The control electrode of the sixth transistor is electrically connected to the first output end; the second electrode of the sixth transistor is used to receive a power supply voltage signal with a fourth level; wherein the fourth level is the signal level corresponding to when the fifth transistor is turned off.

6. The dual-battery switching circuit according to any one of claims 1 to 5, characterized in that: The dual-battery switching circuit also includes a main power supply circuit; The input end of the main power supply circuit is electrically connected to the voltage output end of the first switching circuit and the voltage output end of the second switching circuit respectively, the control end of the main power supply circuit is electrically connected to the control circuit, and the output end of the main power supply circuit serves as the power supply output end of the dual-battery switching circuit; The main power supply circuit is used to control the dual-battery switching circuit to completely cut off power under the control of the control circuit.

7. The dual-battery switching circuit according to claim 6, characterized in that: The main power supply circuit includes a fifth field effect transistor, a sixth field effect transistor and a seventh transistor; The first electrode of the fifth field-effect transistor is electrically connected to the voltage output terminal of the first switching circuit and the voltage output terminal of the second switching circuit, respectively; the second electrode of the fifth field-effect transistor is electrically connected to the first electrode of the sixth field-effect transistor; and the control electrode of the fifth field-effect transistor is used to receive a power supply voltage signal having a fifth level, where the fifth level is a signal level corresponding to when the fifth field-effect transistor is turned on. The control electrode of the sixth field effect transistor is electrically connected to the first electrode of the seventh transistor; the second electrode of the sixth field effect transistor serves as the power supply output end; The control electrode of the seventh transistor is electrically connected to the control circuit; the second electrode of the seventh transistor is used to receive a power supply voltage signal with a sixth level, and the sixth level is the signal level corresponding to when the sixth field effect transistor is turned on.

8. The dual-battery switching circuit according to claim 7, characterized in that: The main power supply circuit also includes a first diode and a key switch; The anode of the first diode is electrically connected to the control electrode of the sixth field-effect transistor and the first electrode of the seventh transistor respectively, and the cathode of the first diode is electrically connected to the first end of the key switch; the second end of the key switch is used to receive the power supply voltage signal with the sixth level.

9. A battery box, characterized in that: The battery box includes a dual-path battery switching circuit as described in any one of claims 1-8.

10. A portable oxygen concentrator, characterized in that: The portable oxygen concentrator includes the battery pack of claim 9.

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