Multi-port charging circuit, charging apparatus and charging method

Abstract

Disclosed in the embodiments of the present application are a multi-port charging circuit, a charging apparatus and a charging method. The multi-port charging circuit comprises first charging circuits and a second charging circuit, each first charging circuit comprising a flyback converter and a first charging port connected to the flyback converter, and the second charging circuit comprising switching circuits and a second charging port, wherein an input end of each switching circuit is connected to an output end of the flyback converter, and an output end of the switching circuit is connected to the second charging port; there are at least two first charging circuits, the number of switching circuits is the same as the number of first charging circuits, and the switching circuits are connected to the first charging circuits in a manner of corresponding to each other on a one-to-one basis; and when the second charging port performs charging outwards, one of the switching circuits is switched on, and a flyback converter connected to the switched-on switching circuit supplies power to the second charging port, so that different first charging circuits can be switched to to supply power to the second charging circuit.

Description

Multi-port charging circuit, charging device and charging method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2023, with application number 202311631186.6 and invention name “Multi-port charging circuit, charging device and charging method”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of charging equipment, and in particular to a multi-port charging circuit, a charging device, and a charging method. Background Art

[0003] Nowadays, there are more and more smart devices that need to be charged in daily life, including smart phones, laptops, tablets and other smart devices, as well as power tools, cordless vacuum cleaners, car vacuum cleaners, etc. that support mainstream fast charging protocols. Therefore, multi-port charging devices are derived from the technology of the exemplary single-port charging device. Multi-port charging devices often include at least three charging ports, where the first port draws power from the second port. When charging using the first port, the charging power of the second port will not reach the rated charging power, resulting in lower charging efficiency of the second port. Summary of the Invention

[0004] Embodiments of the present application provide a multi-port charging circuit, a charging device, and a charging method, which are intended to dynamically switch between multiple first charging circuits that power a second charging circuit to improve the charging efficiency of the multi-port charging circuit.

[0005] An embodiment of the present application provides a multi-port charging circuit, including a first charging circuit and a second charging circuit, wherein the first charging circuit includes a flyback converter and a first charging port connected to the output of the flyback converter; the second charging circuit includes a switching circuit and a second charging port, wherein the input of the switching circuit is connected to the output of the flyback converter, and the output of the switching circuit is connected to the second charging port; wherein the number of the first charging circuits is at least two, the number of the switching circuits is the same as the number of the first charging circuits and the switching circuits are connected one-to-one; when the second charging port is charging externally, one of the switching circuits is turned on, and the flyback converter connected to the turned-on switching circuit is used to power the second charging port; and the first charging port and the second charging port use at least partially different charging protocols.

[0006] Based on the above embodiment, when the controller detects that the second charging port is connected to a second device to be charged, it controls one of the multiple switch circuits to conduct, so that the second charging circuit can draw power from the output of the corresponding flyback converter to power the second device to be charged connected to the second charging port. Because each first charging circuit includes a flyback converter, the outputs of any two first charging circuits do not affect each other. Therefore, when the output of the corresponding flyback converter is used to power the second charging circuit, the other first charging circuits are not affected, thereby ensuring the charging efficiency of the other first charging circuits. When the power of the other first charging circuits decreases, the controller can also control the switch circuit corresponding to the first charging circuit with reduced power to conduct, so that the output of the flyback converter corresponding to the first charging circuit with reduced power continues to power the second charging circuit. This can achieve switching between different first charging circuits to power the second charging circuit, thereby ensuring that each first charging circuit and the second charging circuit have high charging efficiency as much as possible.

[0007] An embodiment of the present application also provides a charging device, including a housing, a circuit board, and a multi-port charging circuit; the circuit board is disposed in the housing; and the multi-port charging circuit is disposed on the circuit board.

[0008] The present application also provides a charging method applicable to a charging device, the charging method comprising:

[0009] When detecting that the second charging port is connected to a second device to be charged, obtaining the output power of each first charging circuit;

[0010] selecting one of the first charging circuits as a target power-taking circuit according to a preset rule based on the output power of each of the first charging circuits;

[0011] The switch circuit connected to the target power taking circuit is controlled to be turned on, so that the target power taking circuit supplies power to the second charging port.

[0012] In the multi-port charging circuit of the present application, when a controller detects that a second charging port is connected to a second device to be charged, it controls one of the multiple switch circuits to conduct, allowing the second charging circuit to draw power from the output of the corresponding flyback converter to power the second device to be charged connected to the second charging port. Because each first charging circuit includes a flyback converter, the outputs of any two first charging circuits do not affect each other. When the output of the corresponding flyback converter supplies power to the second charging circuit, the other first charging circuits are unaffected, thereby ensuring the charging efficiency of the other first charging circuits. When the power of the other first charging circuits decreases, the controller can also control the switch circuit corresponding to the first charging circuit with reduced power to conduct, so that the output of the flyback converter corresponding to the first charging circuit with reduced power continues to supply power to the second charging circuit. This allows switching between different first charging circuits to power the second charging circuit, thereby ensuring that each first charging circuit and the second charging circuit have high charging efficiency as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0014] FIG1 is a schematic structural diagram of a charging device according to an embodiment of the present application;

[0015] FIG2 is a schematic diagram of a multi-port charging circuit according to an embodiment of the present application;

[0016] FIG3 is a circuit diagram of a multi-port charging circuit in an embodiment of the present application;

[0017] FIG4 is a schematic diagram of a charging method according to an embodiment of the present application;

[0018] FIG5 is a schematic flow chart of a charging method in another embodiment of the present application;

[0019] FIG6 is a schematic flow chart of a charging method in another embodiment of the present application;

[0020] FIG7 is a flow chart of a charging method in another embodiment of the present application.

[0021] Explanation of the accompanying drawings: 1. Charging device; 11. Shell; 13. Multi-port charging circuit; 131. First charging circuit; 131A. First charging port; 1311. Flyback converter; 13111. Positive transmission line; 13112. Negative transmission line; 132. Second charging circuit; 132A. Second charging port; 132B. Positive power terminal; 132C. Negative power terminal; 1321. Switching circuit; 13211. Back-to-back switching tube circuit; 133. Controller; 133A. Control output terminal; Q1. First field-effect transistor; Q2. Second field-effect transistor; Q3. Switching element; ZD1. Zener diode; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0023] Referring to Figures 1 and 2, an embodiment of the present application provides a charging device 1. The charging device 1 is configured for the consumer electronics field. The charging device 1 may exemplarily be a charging head, a mobile power supply, an adapter, or the like. The charging power of the charging device 1 may exemplarily be 5W, 10W, 12W, 15W, 18W, 20W, 27W, 30W, 33W, 40W, 45W, 65W, 90W, 120W, 150W, 180W, 240W, or the like. The charging device 1 includes a housing 11, a circuit board (not shown), and a multi-port charging circuit 13.

[0024] The housing 11 can be made of plastic or metal. Specifically, the housing 11 can be made of plastic to insulate the housing 11, thereby reducing the risk of electric shock to the user. Furthermore, since plastic is lightweight, the housing 11 is lightweight, thereby reducing the overall weight of the charging device 1 and making the charging device 1 portable. Specifically, the housing 11 can be integrally injection molded to provide the housing 11 with high structural strength, making it less susceptible to damage and protecting other components within the housing 11, thereby reducing the probability of damage to other components and extending the service life of the charging device 1.

[0025] There are multiple charging ports on the shell 11. The charging device 1 can use AC power or its own battery to power electrical devices through the charging port. The electrical devices include but are not limited to mobile phones, tablets, laptops and smart watches. The charging port includes at least one of a USB-A interface, a Micro USB interface, a USB Type-C interface or a Lightning interface.

[0026] The multi-port charging circuit 13 can be formed on the circuit board through an etching process, thereby improving the manufacturing efficiency of the multi-port charging circuit 13 and further reducing the manufacturing cost of the multi-port charging circuit 13 .

[0027] Referring to Figures 1 and 2 , the multi-port charging circuit 13 includes a first charging circuit 131 and a second charging circuit 132. The first charging circuit 131 includes a flyback converter 1311 and a first charging port 131A connected to the output of the flyback converter 1311. The second charging circuit 132 includes multiple switch circuits 1321 and a second charging port 132A. There are multiple first charging circuits 131, and the number of switch circuits 1321 is the same as the number of first charging circuits 131. The inputs of the multiple switch circuits 1321 are connected to the outputs of the multiple flyback converters 1311 in a one-to-one correspondence, and the outputs of the multiple switch circuits 1321 are all connected to the second charging port 132A. When the corresponding switch circuit 1321 is turned on, the circuit between the flyback converter 1311 and the second charging port 132A is conductive, allowing the flyback converter 1311 to charge the second charging port 132A. For example, the first charging port 131A may be a USB Type-C port, and the second charging port 132A may be a USB-A port. Optionally, the first charging port 131A and the second charging port 132A may use completely different or partially different charging protocols. For example, the first charging port 131A may use the PD protocol, while the second charging port 132A may use the QC protocol. Alternatively, the first charging port 131A may use both the PD and QC protocols, while the second charging port 132A may use the QC protocol.

[0028] Referring to Figures 1-3 , the first charging circuit 131 and the second charging circuit 132 are both connected to a controller 133. The controller 133 is configured to detect the insertion of the first charging port 131A and the second charging port 132A, and to communicate with the first and second devices to obtain the charging power for the first and second devices. This allows the controller 133 to control the corresponding first charging circuit 131 to output the corresponding output power via the first charging port 131A, and to control the corresponding second charging circuit 132 to output the corresponding output power via the second charging port 132A, to meet the charging needs of the first and second devices. It is understood that the controller 133 may be a protocol chip or the main controller 133 of the charging device 1. In this embodiment of the present application, the specific form of the controller 133 is not limited. It is understood that the controller 133 also has multiple control output terminals 133A, which are connected in a one-to-one correspondence with the multiple switch circuits 1321 to control the on / off operation of each switch circuit 1321.

[0029] In the embodiment of the present application, each switch circuit 1321 is connected to the controller 133. When the controller 133 detects that the second charging port 132A is connected to the second device to be charged, the controller 133 controls one of the multiple switch circuits 1321 to be conductive, so that the second charging circuit 132 can draw power from the output end of the flyback converter 1311 corresponding to the conductive switch circuit 1321 to power the second device to be charged connected to the second charging port 132A. Because each first charging circuit 131 includes a flyback converter 1311, the outputs of any two first charging circuits 131 do not affect each other. Therefore, when the output end of the corresponding flyback converter 1311 is used to power the second charging circuit 132, the other first charging circuits 131 are not affected, thereby ensuring the charging efficiency of the other first charging circuits 131. Furthermore, when the power of another first charging circuit 131 decreases, the controller 133 can further control the switch circuit 1321 corresponding to the first charging circuit 131 with the decreased power to be turned on, so that the output end of the flyback converter 1311 corresponding to the first charging circuit 131 with the decreased power continues to supply power to the second charging circuit 132. This allows switching between different first charging circuits 131 to supply power to the second charging circuit 132, thereby ensuring that each first charging circuit 131 and the second charging circuit 132 have a high charging efficiency as much as possible.

[0030] Please refer to Figures 1-3. In a specific embodiment, the switching circuit 1321 includes a back-to-back switching tube circuit 13211 and a switching element Q3. The input end of the back-to-back switching tube circuit 13211 serves as the input end of the switching circuit 1321, and the output end of the back-to-back switching tube serves as the output end of the switching circuit 1321. The input end of the switching element Q3 is connected to the controlled end of the back-to-back switching tube circuit 13211, and the output end of the switching element Q3 is connected to the output end of the corresponding flyback converter 1311. The controlled end of the switching element Q3 is configured to receive an on / off control signal.

[0031] When the controller 133 detects that a second device to be charged is plugged into the second charging port 132A, the controller 133 can send a conduction signal to the controlled end of the switching element Q3 corresponding to the first charging circuit 131 to turn on the switching element Q3, thereby making the input and output ends of the back switch tube circuit conductive, so that the output end of the corresponding flyback converter 1311 can power the second charging circuit 132, and the second charging circuit 132 can charge the second device to be charged via the second charging port 132A.

[0032] Specifically, the back-to-back switch circuit 13211 includes two switches, which are arranged opposite each other and connected in series. When one switch is turned on, the other switch is also turned on, so that the back-to-back switch circuit 13211 is turned on. The switch can be at least one of a bipolar junction transistor (BJT) and a metal-oxide-semiconductor (MOS). In the embodiments of the present application, the type of switch is not specifically limited.

[0033] Please refer to Figures 1-3. In a specific embodiment, the back-to-back switch tube circuit 13211 includes a first field effect tube Q1 and a second field effect tube Q2. The first field effect tube Q1 includes a first body diode, and the input end of the first field effect tube Q1 serves as the input end of the back-to-back switch tube circuit 13211; the second field effect tube Q2 includes a second body diode, and the input end of the second field effect tube Q2 is connected to the output end of the first field effect tube Q1, and the output end of the second field effect tube Q2 serves as the output end of the back-to-back switch tube circuit 13211. The controlled end of the second field effect tube Q2 is connected to the controlled end of the first field effect tube Q1 and serves as the controlled end of the back-to-back switch tube circuit 13211.

[0034] When the switch element Q3 is on, the first FET Q1 and the second FET Q2 are also on, connecting the corresponding output terminals of the flyback converter 1311 to the second charging circuit 132. When the switch element Q3 is off, the first FET Q1 and the second FET Q2 are also off. Because the first body diode and the second body diode are positioned opposite each other, the reverse blocking behavior of the diodes prevents the voltage at the output terminals of other flyback converters 1311 from flowing into the second charging circuit 132, thereby preventing interference with the power supply provided by the second charging circuit 132 to the second device to be charged via the second charging port 132A. Furthermore, the voltage of the second charging circuit 132 is prevented from flowing back into other first charging circuits 131, thereby preventing interference with the power supply provided by other first charging circuits 131 to the first device to be charged. This improves the overall safety of the multi-port charging circuit 13.

[0035] Please refer to Figures 1-3. In a specific embodiment, the output end of the flyback converter 1311 includes a positive power transmission line 13111 and a negative power transmission line 13112. The second charging port 132A has a positive power connection terminal 132B and a negative power connection terminal 132C. The negative power connection terminal 132C is connected to the negative power transmission line 13112. The output end of the switching element Q3 is connected to the negative power transmission line 13112. The first field effect transistor Q1 is a first PMOS transistor. The drain of the first PMOS transistor is the input end of the first field effect transistor Q1 and is connected to the positive power transmission line 13111. The source of the first PMOS transistor is the output end of the first field effect transistor Q1, and the output end of the first field effect transistor Q1 is connected to the output end of the second field effect transistor Q2. The gate of the first PMOS transistor is the controlled end of the first field effect transistor Q1. The second field effect transistor Q2 is a second PMOS transistor. The source of the second PMOS transistor is the input end of the second field effect transistor Q2. The drain of the second PMOS transistor is the output end of the second field effect transistor Q2 and is connected to the positive electrode terminal 132B. The gate of the second PMOS transistor is the controlled end of the second field effect transistor Q2. The controlled end of Q2 is connected to the output end of the switching element Q3.

[0036] The synchronous rectifier controller is configured to control the switching of rectifier element Q4. By controlling the opening and closing of rectifier element Q4, the synchronous rectifier controller rectifies the AC power in the secondary coil into DC power. Rectifier element Q4 can be a power MOSFET. When the secondary coil is conducting, current first flows through the body diode of the power MOSFET. When the synchronous rectifier controller detects that the voltage difference between the source and drain voltages is greater than or equal to a set value, it turns on the power MOSFET, thereby reducing the conduction losses of the system. When the synchronous rectifier controller detects that the voltage difference between the source and drain voltages is less than a set value, it turns off the power MOSFET.

[0037] Please refer to Figure 1-3. Further, in order to facilitate the conduction of the first PMOS tube and the second PMOS tube, the back-to-back switch tube circuit 13211 also includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is connected to the output end of the first field effect tube Q1, and the second end of the first resistor R1 is connected to the controlled end of the first field effect tube Q1; the first end of the second resistor R2 is connected to the second end of the first resistor R1, and the second end of the second resistor R2 is connected to the input end of the switching element Q3.

[0038] When the controller 133 detects that a second device to be charged is connected to the second charging interface, the controller 133 selectively sends a conduction signal to the switch element Q3 of the switch circuit 1321 to turn on the switch element Q3, thereby turning on the positive transmission line 13111, the first body diode, the first resistor R1, the second resistor R2, and the negative transmission line 13112, so that a voltage drop exists across the first resistor R1, thereby making the gate voltage of the first PMOS transistor less than the source voltage of the first PMOS transistor, and the gate voltage of the second PMOS transistor less than the source voltage of the second PMOS transistor. The first PMOS transistor and the second PMOS transistor are turned on, and the positive transmission line 13111, the first PMOS transistor, the second PMOS transistor, the second charging circuit 132, and the negative transmission line 13112 are turned on, thereby making the second charging circuit 132 and the selected first charging circuit 131 connected in parallel, and the second charging circuit 132 can supply power to the second device to be charged via the second charging port 132A.

[0039] Specifically, the controller 133 selectively sends a turn-on signal to the switch element Q3 of the switch circuit 1321. When the controller 133 detects that at least one first charging port 131A is not connected to the first device to be charged, the controller 133 controls the switch circuit 1321 corresponding to the first charging circuit 131 of one of the first charging ports 131A to turn on, so that the first charging circuit 131 supplies power to the second charging circuit 132. When the controller 133 detects that the output power of at least one first charging circuit 131 is less than the rated output power, the controller 133 controls the switch circuit 1321 corresponding to one of the first charging circuits 131 to turn on, so that the first charging circuit 131 supplies power to the second charging circuit 132. When the controller 133 detects that the output power of all first charging circuits 131 is the rated power, the controller 133 controls the switch circuit 1321 corresponding to a predetermined first charging circuit 131 to turn on, so that the predetermined first charging circuit 131 supplies power to the second charging circuit 132.

[0040] Referring to Figures 1-3, in a specific embodiment, the switching circuit 1321 further includes a Zener diode ZD1. The cathode of the Zener diode ZD1 is connected to the first end of the first resistor R1, and the anode of the Zener diode ZD1 is connected to the second end of the first resistor R1. When the source voltage of the first PMOS transistor and the second PMOS transistor is greater than a preset gate voltage, the Zener diode ZD1 reversely breaks down and conducts to prevent the source voltage from being too high and thus preventing the first PMOS transistor and the second PMOS transistor from burning out. This can extend the service life of the first PMOS transistor and the second PMOS transistor, thereby extending the service life of the multi-port charging circuit 13.

[0041] 1-3 , it can be understood that the first field effect transistor Q1 and the second field effect transistor Q2 may also be NMOS transistors, which will not be described in detail here.

[0042] 1-3 , in a specific embodiment, the switch element Q3 includes at least one of a triode, a field effect transistor, an insulated gate bipolar transistor (IGBT), or an electromagnetic relay.

[0043] Please refer to Figures 1-3. In a specific embodiment, the switching element Q3 is a field effect transistor. For example, when the switching element Q3 is an NMOS transistor, the gate of the NMOS is the controlled end of the switching element Q3, the drain of the NMOS is the input end of the switching element Q3, and the source of the NMOS is the output end of the switching element Q3. The switching circuit 1321 also includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is connected to the controlled end of the switching circuit 1321, and the second end of the third resistor R3 is connected to the controlled end of the switching element Q3; the first end of the fourth resistor R4 is connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is connected to the output end of the switching element Q3.

[0044] When the controller 133 sends a conduction signal to the switch circuit 1321, the conduction signal is divided by the third resistor R3 and the fourth resistor R4 and enters the controlled end of the switch element Q3, thereby conducting between the input and output ends of the switch element Q3. This can reduce the probability of damage to the switch element Q3, thereby extending the service life of the switch element Q3, thereby extending the service life of the switch circuit 1321, and further extending the service life of the multi-port charging circuit 13.

[0045] It can be understood that the switching circuit 1321 can also include an armature switch and a coil, one end of the armature switch serves as the input end of the switching circuit 1321, and the other end of the armature switch serves as the output end of the switching circuit 1321; the coil is set corresponding to the armature switch, one end of the coil serves as the controlled end of the switching circuit 1321, and the other end of the coil is grounded.

[0046] When the controller 133 sends a conduction signal to the controlled end of the switch circuit 1321, the coil is energized to attract the armature switch, turning it on. This turns on the switch circuit 1321 and enables the second charging circuit 132 to draw power from any of the first switch circuits 1321. It is understood that because the electromagnetic relay formed by the armature switch and coil is relatively expensive and occupies a large space in the charging device 1, the use of a field-effect transistor can reduce the cost and size of the charging device 1.

[0047] In the above embodiment, since the second charging circuit 132 is powered by only one of the first charging circuits 131 , each first charging circuit 131 can output a different voltage, thereby outputting a different power to power the first device to be charged.

[0048] If the output voltage of any first charging circuit 131 is insufficient to power the second charging circuit 132, and if the output voltages of the flyback converters 1311 in at least two of the first charging circuits 131 are equal, the controller 133 can control the multi-way switch circuits 1321 corresponding to the multiple first charging circuits 131 with equal output voltages to conduct, so that the second charging port 132A draws power from the output terminals of the corresponding multiple flyback converters 1311, thereby similarly charging the first device to be charged connected to the second charging port 132A. It will be appreciated that the probability of multiple first charging circuits 131 with the same output voltage being fully loaded at the same time is relatively low, that is, the probability of multiple first charging circuits 131 with the same output voltage having excess output power is relatively high. Therefore, if multiple first charging circuits 131 simultaneously power the second charging port 132A, the power supply requirement for the second charging port 132A can be met with a high probability.

[0049] In some embodiments, the state of each first charging circuit 131 can be detected to control one of the switch circuits 1321 to be turned on, thereby electrically connecting the second charging circuit 132 to a first charging circuit 131 that is not connected to a load among the plurality of first charging circuits 131. The states of the first charging circuits 131 include being connected to a load or not being connected to a load. When a first charging circuit 131 is not connected to a load, the remaining charging power of the first charging circuit 131 is relatively high, thereby providing a relatively high output power to the second charging circuit 132, thereby improving the charging efficiency of the second charging circuit 132.

[0050] In some embodiments, the remaining charging power of each first charging circuit 131 can be determined, and one of the switch circuits 1321 can be controlled to conduct, thereby electrically connecting the second charging circuit 132 to the first charging circuit 131 with the greatest remaining power. For example, if multiple first charging circuits 131 are connected to a load, but the remaining powers of each first charging circuit 131 vary, the second charging circuit 132 can be connected to the first charging circuit 131 with the greatest remaining power, thereby providing the second charging circuit 132 with the greatest output power and maximizing its charging efficiency.

[0051] 1-4 , the present embodiment further provides a charging method applicable to the multi-port charging circuit 13 . The charging method includes:

[0052] Step S10 : When it is detected that the second charging port 132A is connected to the second device to be charged, the output power of each first charging circuit 131 is obtained.

[0053] In this embodiment of the present application, the controller 133 obtains multiple output powers of the multiple first charging circuits 131. The output powers can be used to determine the on / off status of the first charging port 131A and the first device to be charged. The on / off status includes a connected state, where the first charging port 131A is connected to the first device to be charged, and a disconnected state, where the first charging port 131A is disconnected from the first device to be charged. For example, a connected state is defined when the output power is greater than or equal to a first threshold, and a disconnected state is defined when the output power is less than the first threshold. The first threshold can be, for example, 0.1W.

[0054] Step S20 : ​​Select a first charging circuit 131 as a target power-taking circuit according to a preset rule based on the output power of each first charging circuit 131 .

[0055] In this embodiment of the present application, the controller 133 determines a target power circuit from the multiple first charging circuits 131 based on their output power. For example, a first charging circuit 131 with a currently lower output power can be selected as the target power circuit, thereby ensuring that this first charging circuit 131 has more remaining power to allocate to the second charging port 132A. When the output powers of the multiple first charging circuits 131 change, the controller 133 can promptly adjust the target power circuit based on the multiple output powers. The preset rules can be set based on actual needs and are not limited here.

[0056] Step S30 : Control the switch circuit 1321 connected to the target power circuit to be turned on, so that the target power circuit supplies power to the second charging port 132A.

[0057] In an embodiment of the present application, the controller 133 controls the switch circuit 1321 corresponding to the target power-taking circuit to be turned on, so that the second charging port 132A draws power from the output end of the flyback converter 1311 in the target power-taking circuit to power the second device to be charged connected to the second charging port 132A. Since each first charging circuit 131 includes a flyback converter 1311, the outputs of any two first charging circuits 131 do not affect each other. When the output end of the corresponding flyback converter 1311 powers the second charging circuit 132, the other first charging circuits 131 are not affected, thereby ensuring the charging efficiency of the other first charging circuits 131. Furthermore, when the power of the other first charging circuits 131 decreases, the controller 133 can also control the switch circuit 1321 corresponding to the first charging circuit 131 currently supplying power to the second charging port 132A to be turned off, and the switch circuit 1321 corresponding to the first charging circuit 131 with decreased power to be turned on, so that the first charging circuit 131 with decreased power continues to supply power to the second charging circuit 132. In this way, different first charging circuits 131 can be switched to supply power to the second charging circuit 132, thereby ensuring that each first charging circuit 131 and the second charging circuit 132 have a high charging efficiency as much as possible.

[0058] Referring to FIG. 1-3 and FIG. 5 , in a specific embodiment, step S20 includes:

[0059] Step S21 : When one or more first charging ports 131A are not connected to a device to be charged, any first charging circuit 131 that is not connected to a device to be charged is used as a target power supply circuit.

[0060] In the embodiment of the present application, when one or more first charging ports 131A are not connected to the device to be charged, the controller 133 uses any first charging circuit 131 that is not connected to the device to be charged as the target power supply circuit, thereby ensuring that sufficient power is allocated to the second charging port 132A, thereby improving the charging efficiency of the second charging port 132A without affecting the charging efficiency of the first charging port 131A.

[0061] Referring to FIG. 1-3 and FIG. 6 , in a specific embodiment, step S20 includes:

[0062] Step S22 : When all first charging ports 131A are connected to devices to be charged, any first charging circuit 131 whose output power is less than the rated power is selected as a target power-taking circuit.

[0063] In the embodiment of the present application, when all first charging ports 131A are connected to devices to be charged, the controller 133 uses any first charging circuit 131 whose output power is less than the rated power as the target power-taking circuit, thereby ensuring the charging efficiency of other first charging circuits 131.

[0064] Referring to FIG. 1-3 and FIG. 7 , in a specific embodiment, step S20 includes:

[0065] Step S23: When all first charging ports 131A are connected to devices to be charged and the output powers of all first charging circuits 131 are rated powers or no devices to be charged are connected to all first charging ports 131A, the preset first charging circuit 131 is used as the target power supply circuit.

[0066] In an embodiment of the present application, when all first charging ports 131A are connected to devices to be charged and the output power of all first charging circuits 131 is rated power, the preset first charging circuit 131 is used as the target power circuit. Alternatively, when no first charging ports 131A are connected to devices to be charged, the controller 133 uses the preset first charging circuit 131 as the target power circuit. The preset first charging circuit 131 has a corresponding preset first charging port 131A. The preset first charging port 131A can be notified to the user through a promotional page or instruction manual. Once the user knows which preset first charging port 131A is, they can make a reasonable choice based on their needs.

[0067] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only set as illustrative illustrations and cannot be understood as limitations on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0068] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A multi-port charging circuit, wherein: include: a first charging circuit, the first charging circuit comprising a flyback converter and a first charging port connected to an output end of the flyback converter; as well as a second charging circuit, comprising a switch circuit and a second charging port, wherein an input end of the switch circuit is connected to an output end of the flyback converter, and an output end of the switch circuit is connected to the second charging port; Wherein, the number of the first charging circuits is at least two, the number of the switch circuits is the same as the number of the first charging circuits and they are connected one-to-one, and when the second charging port is charging externally, one of the switch circuits is turned on, and the flyback converter connected to the turned-on switch circuit is used to power the second charging port; The first charging port and the second charging port employ charging protocols of at least partially different types.

2. The multi-port charging circuit according to claim 1, wherein: The switch circuit comprises: A back-to-back switch tube circuit, wherein the input end of the back-to-back switch tube circuit serves as the input end of the switch circuit, and the output end of the back-to-back switch tube serves as the output end of the switch circuit; and A switch element, wherein the input end of the switch element is connected to the controlled end of the back-to-back switch tube circuit, the output end of the switch element is connected to the corresponding output end of the flyback converter, and the controlled end of the switch element is configured to receive an on-off control signal.

3. The multi-port charging circuit as claimed in claim 2, wherein: The back-to-back switch tube circuit comprises: a first field effect transistor, wherein an input end of the first field effect transistor serves as an input end of the back-to-back switch transistor circuit; and A second field effect transistor, the input end of the second field effect transistor is connected to the output end of the first field effect transistor, the output end of the second field effect transistor serves as the output end of the back-to-back switch tube circuit, and the controlled end of the second field effect transistor is connected to the controlled end of the first field effect transistor and serves as the controlled end of the back-to-back switch tube circuit.

4. The multi-port charging circuit as claimed in claim 3, wherein: The output end of the flyback converter includes a positive transmission line and a negative transmission line, the second charging port has a positive power connection terminal and a negative power connection terminal, the negative power connection terminal is connected to the negative transmission line, and the output end of the switch element is connected to the negative transmission line; The first field effect tube is a first PMOS tube, the drain of the first PMOS tube is the input end of the first field effect tube and is connected to the positive transmission line, the source of the first PMOS tube is the output end of the first field effect tube, and the gate of the first PMOS tube is the controlled end of the first field effect tube; The second field effect tube is a second PMOS tube, the source of the second PMOS tube is the input end of the second field effect tube, the drain of the second PMOS tube is the output end of the second field effect tube and is connected to the positive electrode terminal, and the gate of the second PMOS tube is the controlled end of the second field effect tube.

5. The multi-port charging circuit according to claim 3 or 4, wherein: The back-to-back switch tube circuit further includes: a first resistor, wherein a first end of the first resistor is connected to the output end of the first field effect transistor, and a second end of the first resistor is connected to the controlled end of the first field effect transistor; a second resistor, wherein a first end of the second resistor is connected to a second end of the first resistor, and a second end of the second resistor is connected to an input end of the switch element; and / or, A voltage regulator tube, wherein a cathode of the voltage regulator tube is connected to a first end of the first resistor, and a cathode of the voltage regulator tube is connected to a second end of the first resistor.

6. The multi-port charging circuit as claimed in claim 2, wherein: The switch element includes at least one of a triode, a field effect transistor, an insulated gate bipolar transistor or an electromagnetic relay.

7. The multi-port charging circuit as claimed in claim 6, wherein: The switch element is a field effect transistor, and the switch circuit further includes: a third resistor, wherein a first end of the third resistor is configured to be connected to the on-off control signal, and a second end of the third resistor is connected to the controlled end of the switch element; and A fourth resistor, wherein a first end of the fourth resistor is connected to a second end of the third resistor, and a second end of the fourth resistor is connected to an output end of the switch element.

8. The multi-port charging circuit as claimed in claim 1, wherein: The state of each of the first charging circuits is detected, and one of the switch circuits is controlled to be turned on, so as to electrically connect the second charging circuit to the first charging circuit that is not connected to a load among the plurality of first charging circuits.

9. The multi-port charging circuit according to claim 1, wherein: The remaining charging power of each of the first charging circuits is determined, and one of the switch circuits is controlled to be turned on so as to electrically connect the second charging circuit to the first charging circuit with the largest remaining power.

10. A charging device, wherein: include: case; A circuit board is arranged in the housing; as well as A multi-port charging circuit is arranged on the circuit board, and the multi-port charging circuit includes: a first charging circuit, the first charging circuit comprising a flyback converter and a first charging port connected to an output end of the flyback converter; and a second charging circuit, comprising a switch circuit and a second charging port, wherein an input end of the switch circuit is connected to an output end of the flyback converter, and an output end of the switch circuit is connected to the second charging port; Wherein, the number of the first charging circuits is at least two, the number of the switch circuits is the same as the number of the first charging circuits and they are connected one-to-one, and when the second charging port is charging externally, one of the switch circuits is turned on, and the flyback converter connected to the turned-on switch circuit is used to power the second charging port; The first charging port and the second charging port employ charging protocols of at least partially different types.

11. The charging device according to claim 10, wherein: The switch circuit comprises: A back-to-back switch tube circuit, wherein the input end of the back-to-back switch tube circuit serves as the input end of the switch circuit, and the output end of the back-to-back switch tube serves as the output end of the switch circuit; and A switch element, wherein the input end of the switch element is connected to the controlled end of the back-to-back switch tube circuit, the output end of the switch element is connected to the corresponding output end of the flyback converter, and the controlled end of the switch element is configured to receive an on-off control signal.

12. The charging device according to claim 11, wherein: The back-to-back switch tube circuit comprises: a first field effect transistor, wherein an input end of the first field effect transistor serves as an input end of the back-to-back switch transistor circuit; and A second field effect transistor, the input end of the second field effect transistor is connected to the output end of the first field effect transistor, the output end of the second field effect transistor serves as the output end of the back-to-back switch tube circuit, and the controlled end of the second field effect transistor is connected to the controlled end of the first field effect transistor and serves as the controlled end of the back-to-back switch tube circuit.

13. The charging device according to claim 12, wherein: The output end of the flyback converter includes a positive transmission line and a negative transmission line, the second charging port has a positive power connection terminal and a negative power connection terminal, the negative power connection terminal is connected to the negative transmission line, and the output end of the switch element is connected to the negative transmission line; The first field effect tube is a first PMOS tube, the drain of the first PMOS tube is the input end of the first field effect tube and is connected to the positive transmission line, the source of the first PMOS tube is the output end of the first field effect tube, and the gate of the first PMOS tube is the controlled end of the first field effect tube; The second field effect tube is a second PMOS tube, the source of the second PMOS tube is the input end of the second field effect tube, the drain of the second PMOS tube is the output end of the second field effect tube and is connected to the positive electrode terminal, and the gate of the second PMOS tube is the controlled end of the second field effect tube.

14. The charging device according to claim 12 or 13, wherein: The back-to-back switch tube circuit further includes: a first resistor, wherein a first end of the first resistor is connected to the output end of the first field effect transistor, and a second end of the first resistor is connected to the controlled end of the first field effect transistor; a second resistor, wherein a first end of the second resistor is connected to a second end of the first resistor, and a second end of the second resistor is connected to an input end of the switch element; and / or, A voltage regulator tube, wherein a cathode of the voltage regulator tube is connected to a first end of the first resistor, and a cathode of the voltage regulator tube is connected to a second end of the first resistor.

15. The charging device according to claim 11, wherein: The switch element includes at least one of a triode, a field effect transistor, an insulated gate bipolar transistor or an electromagnetic relay.

16. The charging device according to claim 15, wherein: The switch element is a field effect transistor, and the switch circuit further includes: a third resistor, wherein a first end of the third resistor is configured to be connected to the on-off control signal, and a second end of the third resistor is connected to the controlled end of the switch element; and A fourth resistor, wherein a first end of the fourth resistor is connected to a second end of the third resistor, and a second end of the fourth resistor is connected to an output end of the switch element.

17. A charging method, wherein: Applicable to a charging device, the charging device comprising: case; A circuit board is disposed in the housing; and A multi-port charging circuit is arranged on the circuit board, and the multi-port charging circuit includes: a first charging circuit, the first charging circuit comprising a flyback converter and a first charging port connected to an output end of the flyback converter; and a second charging circuit, comprising a switch circuit and a second charging port, wherein an input end of the switch circuit is connected to an output end of the flyback converter, and an output end of the switch circuit is connected to the second charging port; Wherein, the number of the first charging circuits is at least two, the number of the switch circuits is the same as the number of the first charging circuits and they are connected one-to-one, and when the second charging port is charging externally, one of the switch circuits is turned on, and the flyback converter connected to the turned-on switch circuit is used to power the second charging port; The types of charging protocols adopted by the first charging port and the second charging port are at least partially different; The charging method comprises: When it is detected that the second charging port is connected to the device to be charged, the output power of each first charging circuit is obtained; According to the output power of each of the first charging circuits, a first charging circuit is selected as a target power taking circuit according to a preset rule; The switch circuit connected to the target power taking circuit is controlled to be turned on, so that the target power taking circuit supplies power to the second charging port.

18. The charging method according to claim 17, wherein: The step of selecting a first charging circuit as a target power taking circuit according to a preset rule based on the output power of each first charging circuit comprises: When one or more first charging ports are not connected to the device to be charged, any first charging circuit that is not connected to the device to be charged is used as the target power-taking circuit; or, When all first charging ports are connected to devices to be charged, any first charging circuit whose output power is less than the rated power is used as the target power-taking circuit; or, When all the first charging ports are connected to the devices to be charged and the output powers of all the first charging circuits are rated powers or when all the first charging ports are not connected to the devices to be charged, the preset first charging circuit is used as the target power taking circuit.

19. The charging method according to claim 17, wherein: The switch circuit comprises: A back-to-back switch tube circuit, wherein the input end of the back-to-back switch tube circuit serves as the input end of the switch circuit, and the output end of the back-to-back switch tube serves as the output end of the switch circuit; and A switch element, wherein the input end of the switch element is connected to the controlled end of the back-to-back switch tube circuit, the output end of the switch element is connected to the corresponding output end of the flyback converter, and the controlled end of the switch element is configured to receive an on-off control signal.

20. The charging method according to claim 19, wherein: The back-to-back switch tube circuit comprises: a first field effect transistor, wherein an input end of the first field effect transistor serves as an input end of the back-to-back switch transistor circuit; and A second field effect transistor, the input end of the second field effect transistor is connected to the output end of the first field effect transistor, the output end of the second field effect transistor serves as the output end of the back-to-back switch tube circuit, and the controlled end of the second field effect transistor is connected to the controlled end of the first field effect transistor and serves as the controlled end of the back-to-back switch tube circuit.

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