Charging circuit and charging device

Abstract

The embodiment of the utility model discloses a charging circuit and a charging device, the charging circuit comprises a transformer, a first output circuit, a second output circuit and a control circuit, the transformer is provided with a primary winding, a first secondary winding and a second secondary winding, and the first secondary winding and the second secondary winding are arranged corresponding to the primary winding; the first output circuit comprises a first output port connected with the output end of the first secondary winding; the second output circuit comprises a DC-to-DC converter and a second output port which are connected with each other; the input end of the DC-to-DC converter is connected with the output end of the second secondary winding; the control circuit is connected with the output end of the first secondary winding, the first output circuit and the second output circuit, and the first output circuit is not provided with a DC-to-DC converter compared with an output circuit in the related technology, so that the line loss caused by the DC-to-DC converter can be saved; therefore, the overall output efficiency of the charging circuit can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of charging devices, and in particular to a charging circuit and a charging device. Background Art

[0002] Nowadays, there are more and more smart devices that need to be charged in daily life, such as 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. All of them need to be charged quickly, so multi-port charging devices are derived from the technology of traditional single-port charging devices. Since the required voltage of the power consumption equipment connected to each charging port is different, it is necessary to set a DC-to-DC converter on the line corresponding to each charging port so that the output voltage of each charging port can be changed according to the required voltage of the power consumption equipment, but setting more DC-to-DC converters will make the output efficiency of the charging equipment lower. Utility Model Content

[0003] The embodiments of the present application provide a charging circuit and a charging device, which aim to avoid using a DC-to-DC converter in the first output circuit, thereby saving line losses caused by the DC-to-DC converter, thereby improving the output efficiency of the first output circuit, and further improving the output efficiency of the charging circuit.

[0004] An embodiment of the present application provides a charging circuit, including a transformer, a first output circuit, a second output circuit and a control circuit, the transformer having a primary winding, a first secondary winding and a second secondary winding, the first secondary winding and the second secondary winding being both arranged corresponding to the primary winding; the first output circuit including a first output port connected to the output end of the first secondary winding; the second output circuit including a DC-to-DC converter and a second output port connected to each other, the input end of the DC-to-DC converter being connected to the output end of the second secondary winding; the control circuit is connected to the output end of the first secondary winding, the first output circuit and the second output circuit, the control circuit being used to adjust the bus voltage at the output end of the first secondary winding according to the output voltages of the first output circuit and the second output circuit.

[0005] Based on the above embodiments, since the first output circuit is not provided with a DC-to-DC converter compared to the output circuit in the related art, the line loss caused by the DC-to-DC converter can be saved, thereby improving the output efficiency of the first output circuit to improve the overall output efficiency of the charging circuit, and since the first output circuit is not provided with a DC-to-DC converter, the space occupied by the first output circuit can be reduced to reduce the volume of the charging circuit, thereby reducing the volume of the charging device. When the control circuit detects that at least one of the output voltage of the first output circuit and the output voltage of the second output circuit is greater than the bus voltage at the output end of the first secondary winding, the bus voltage at the output end of the first secondary winding can be boosted to make the bus voltage of the first secondary winding closer to the output voltage of the first output port, so as to improve the output efficiency of the first output circuit. Furthermore, since the first secondary winding and the second secondary winding are both wound on the same iron core, the bus voltage at the output end of the first secondary winding increases. According to the principle of electromagnetic induction, the magnetic flux of the first secondary winding in the iron core will increase, thereby causing the bus voltage of the second secondary winding to increase synchronously. The increase ratio is the ratio of the number of turns of the first secondary winding to the second secondary winding. When the bus voltage of the second secondary winding increases, the bus voltage of the second secondary winding will also be close to the output voltage of the second output port, thereby improving the output efficiency of the second output circuit, and further improving the output efficiency of the charging circuit.

[0006] An embodiment of the present application also provides a charging device, including a shell, a circuit board and a charging circuit; the circuit board is arranged in the shell; and the charging circuit is arranged on the circuit board.

[0007] A charging circuit based on the present application, since the transformer includes a primary winding and a first winding and a second winding corresponding to the primary winding, and the first winding and the second winding are respectively connected to the first output circuit and the second output circuit, the first output circuit is not provided with a DC-to-DC converter compared to the output circuit in the related art, and the line loss caused by the DC-to-DC converter can be saved, thereby improving the output efficiency of the first output circuit, so as to improve the overall output efficiency of the charging circuit, and since the first output circuit is not provided with a DC-to-DC converter, the space occupied by the first output circuit can be reduced, so as to reduce the volume of the charging circuit, thereby reducing the volume of the charging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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.

[0009] Figure 1 This is a schematic diagram of the structure of a charging device in one embodiment of the present application;

[0010] Figure 2 This is a schematic diagram of the framework structure of a charging circuit in one embodiment of the present application;

[0011] Figure 3 This is a schematic diagram of the structure of a charging circuit in an embodiment of the present application.

[0012] Explanation of the accompanying drawings: 1. Charging device; 11. Shell; 12. Circuit board; 13. Charging circuit; 131. Transformer; 132. First output circuit; 132A. First output port; 1321. First protocol chip; 133. Second output circuit; 133A. Second output port; 1331. DC-to-DC converter; 1332. Second protocol chip; 134. Control circuit; 1341. Controller; 1342. Boost circuit; 13421. Sampling circuit; 13421A. Sampling output terminal; 13422. Voltage stabilizing circuit; 13423. Switching circuit; N0. Primary winding; N1. First secondary winding; N2. Second secondary winding; R1. First resistor; R2. Second resistor; R3. Third resistor; R4. Fourth resistor; R5. Fifth resistor; K1. Controllable precision voltage stabilizing source; Q1. Switching element. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0014] Please refer to Figure 1 An embodiment of the present application provides a charging device 1, including a housing 11, a circuit board 12 and a charging circuit 13.

[0015] The shell 11 can support and protect the electronic components disposed in the shell 11. The shell 11 can be made of plastic or metal. Specifically, the shell 11 can be made of plastic to insulate the shell 11, thereby reducing the risk of electric shock to the user. In addition, since the plastic material is light in weight, the shell 11 is light in weight, thereby making the overall weight of the charging device 1 lighter, so that the charging device 1 is easy to carry. Specifically, the shell 11 can be integrally injection molded, so that the shell 11 has a high structural strength, so that the shell 11 is not easily damaged, and can protect other components in the shell 11 to reduce the probability of damage to other components, so that the charging device 1 can have a longer service life.

[0016] The shell 11 also has multiple charging ports. The charging device 1 can be connected to the mains and power the electrical devices through the charging port. The electrical devices include but are not limited to mobile phones, tablets 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.

[0017] The charging circuit 13 can be formed on the circuit board 12 by an etching process, so that the manufacturing efficiency of the charging circuit 13 can be improved, and further the manufacturing cost of the charging circuit 13 can be reduced.

[0018] Please refer to Figure 1 and Figure 2 In a specific embodiment, the charging circuit 13 includes a transformer 131 , a first output circuit 132 , a second output circuit 133 and a control circuit 134 .

[0019] The transformer 131 has a primary winding N0, a first secondary winding N1 and a second secondary winding N2, and the first secondary winding N1 and the second secondary winding N2 are both arranged corresponding to the primary winding N0. When the charging device 1 is connected to AC power, the AC power is connected to the primary winding N0 via a rectifier and a filter, and a magnetic field is generated in the magnetic core, which is electromagnetically induced to the first secondary winding N1 and the second secondary winding N2, so that the first secondary winding N1 and the second secondary winding N2 can output voltage. It can be understood that the primary winding N0 is also connected to a frequency modulation circuit, which can change the output voltage of the primary winding N0, which is not described in detail here.

[0020] The first output circuit 132 includes a first output port 132A connected to the output end of the first secondary winding N1, so that the first output port 132A can supply power to the power-consuming device. The first output port 132A includes at least one of a USB Type-C port and a USB-A port.

[0021] The second output circuit 133 includes a DC-DC converter 1331 and a second output port 133A connected to each other, and the input end of the DC-DC converter 1331 is connected to the output end of the second secondary winding N2; the DC-DC converter 1331 can convert the two secondary windings into the output voltage required by the second output port 133A, and then supply power to the second output port 133A, so that the second output port 133A can supply power to the electrical device. It is understandable that the output end of the second secondary winding N2 can be connected in parallel with multiple second output circuits 133, so that there can be multiple second output ports 133A, which can supply power to different electrical devices. It is understandable that the transformer 131 can have multiple second secondary windings N2, and the output ends of multiple second secondary windings N2 can be connected to at least one second output circuit 133. In the embodiment of the present application, there is no specific restriction on the number of the second secondary windings N2, and there is no specific restriction on the number of the second output circuits 133. The second output port 133A includes at least one of a USB Type-C port and a USB-A port.

[0022] The control circuit 134 is connected to the output end of the first secondary winding N1, the first output circuit 132 and the second output circuit 133. The control circuit 134 is used to adjust the bus voltage at the output end of the first secondary winding N1 according to the output voltages of the first output circuit 132 and the second output circuit 133, thereby raising the bus voltage at the output end of the first secondary winding N1 and raising the bus voltage at the output end of the second secondary winding N2. When multiple ports output different voltages at the same time, the voltage difference of the overall voltage range is reduced to improve the efficiency of the entire system.

[0023] In another embodiment, the control circuit 134 may also be connected to the output end of the second secondary winding N2, and is used to adjust the bus voltage at the output end of the second secondary winding N2 according to the output voltages of the first output circuit 132 and the second output circuit 133, thereby raising the bus voltage at the output end of the second secondary winding N2 and raising the bus voltage at the output end of the first secondary winding N1. The circuit composition structure is the same as that of the above embodiment, and will not be described in detail in this embodiment.

[0024] In the embodiment of the present application, since the first output circuit 132 is not provided with a DC-to-DC converter 1331 compared to the output circuit in the related art, the line loss caused by the DC-to-DC converter 1331 can be saved, thereby improving the output efficiency of the first output circuit 132 to improve the overall output efficiency of the charging circuit 13, and since the first output circuit 132 is not provided with a DC-to-DC converter 1331, the space occupied by the first output circuit 132 can be reduced to reduce the volume of the charging circuit 13, thereby reducing the volume of the charging device 1. When the control circuit 134 detects that at least one of the output voltage of the first output circuit 132 and the output voltage of the second output circuit 133 is greater than the bus voltage at the output end of the first secondary winding N1, the bus voltage at the output end of the first secondary winding N1 can be boosted so that the bus voltage of the first secondary winding N1 is closer to the output voltage of the first output port 132A, so as to improve the output efficiency of the first output circuit 132. Furthermore, since the first secondary winding N1 and the second secondary winding N2 are both wound on the same iron core, the bus voltage at the output end of the first secondary winding N1 is increased according to the principle of electromagnetic induction. The magnetic flux of the first secondary winding N1 in the iron core will increase, so that the bus voltage of the second secondary winding N2 will increase synchronously. The increase ratio is the turns ratio of the first secondary winding N1 to the second secondary winding N2. When the bus voltage of the second secondary winding N2 increases, the bus voltage of the second secondary winding N2 will also be close to the output voltage of the second output port 133A, thereby improving the output efficiency of the second output circuit 133, and further improving the output efficiency of the charging circuit 13.

[0025] Please refer to Figure 1-3 In a specific embodiment, the first output circuit 132 includes a first protocol chip 1321, which is connected in series between the first secondary winding N1 and the first output port 132A, and the second output circuit 133 includes a second protocol chip 1332, which is connected in series between the DC-DC converter 1331 and the second output port 133A. When the electric device is connected to the first output port 132A, the electric device and the first protocol chip 1321 interact with each other so that the first protocol chip 1321 controls the first output circuit 132 to output the power supply voltage required by the electric device within a preset range; when the electric device is connected to the second output port 133A, the electric device and the second protocol chip 1332 interact with each other so that the second protocol chip 1332 controls the output end of the DC-DC converter 1331 to output the power supply voltage required by the electric device.

[0026] Please refer to Figure 1-3In a specific embodiment, the control circuit 134 further includes a controller 1341 and a boost circuit 1342. The controller 1341 may be the controller 1341 of the charging circuit 13 or the controller 1341 of the charging device 1. In the embodiment of the present application, the specific form of the controller 1341 is not limited. The controller 1341 is connected to the first output circuit 132 and the second output circuit 133 to detect the output voltage of the first output circuit 132. Exemplarily, the controller 1341 may be connected to the first output port 132A and the second output port 133A to detect the output voltage of the first output port 132A and the second output port 133A. Exemplarily, the controller 1341 may also be connected to the first protocol chip 1321 and the second protocol chip 1332, so that the controller 1341 can obtain the protocol information of the first protocol chip 1321 and the second protocol chip 1332, and can also obtain the output voltage of the first output port 132A and the second output port 133A. In the embodiment of the present application, there is no specific limitation on the form in which the controller 1341 obtains the output voltage from the first output circuit 132 and the second output circuit 133 .

[0027] Please refer to Figure 3 The boost circuit 1342 is connected to the output end of the first secondary winding N1 and the controller 1341. When the controller 1341 detects that the voltages of the first output port 132A and the second output port 133A are higher than the bus voltage of the first secondary winding N1, the controller 1341 controls the boost circuit 1342 to operate so as to raise the bus voltage of the first secondary winding N1, so that when the output voltage of the first output port 132A is higher than the bus voltage of the first secondary winding N1, the bus voltage of the first secondary winding N1 can be made closer to the output voltage of the first output port 132A, thereby improving the output efficiency of the first output circuit 132; and since the bus voltage of the first secondary winding N1 is raised, the bus voltage of the second secondary winding N2 is also raised, so that the bus voltage of the second secondary winding N2 is made closer to the output voltage of the second output port 133A, thereby improving the output efficiency of the second output circuit 133.

[0028] Please refer to Figure 3In a specific embodiment, the boost circuit 1342 includes a sampling circuit 13421, a voltage stabilizing circuit 13422, and a switch circuit 13423. The sampling circuit 13421 is connected to the output end of the first secondary winding N1 and has a sampling output end 13421A. The voltage stabilizing circuit 13422 is connected to the output end of the first secondary winding N1 and to the sampling output end 13421A, and is used to dynamically stabilize the bus voltage at the output end of the first secondary winding N1 according to the voltage of the sampling output end 13421A. The switch circuit 13423 is connected to the sampling output end 13421A and to the controller 1341, and is controlled by the controller 1341. When the switch circuit 13423 is controlled to be turned on, the bus voltage is raised.

[0029] Please refer to Figure 3 In a specific embodiment, the sampling circuit 13421 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 secondary winding N1; 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 grounded; the first end of the second resistor R2 is the sampling output end 13421A, and the bus voltage of the first secondary winding N1 is divided by the first resistor R1 and the second resistor R2, and the sampling voltage is output from the sampling output end 13421A.

[0030] Please refer to Figure 3 In a specific embodiment, the voltage stabilizing circuit 13422 includes a third resistor R3 and a controllable precision voltage stabilizing source K1, the first end of the third resistor R3 is connected to the output end of the first secondary winding N1; the negative electrode of the controllable precision voltage stabilizing source K1 is connected to the second end of the third resistor R3, the positive electrode of the controllable precision voltage stabilizing source K1 is grounded, the reference electrode of the controllable precision voltage stabilizing source K1 is connected to the sampling output end 13421A, and the third resistor R3 is used to limit the current of the controllable precision voltage stabilizing source K1 to prevent the controllable precision voltage stabilizing source K1 from being burned out by large current, so that the controllable precision voltage stabilizing source K1 can have a longer service life.

[0031] Please refer to Figure 3For example, the controllable precision voltage regulator K1 can be a TL431 controllable precision voltage regulator K1. When the bus voltage at the output end of the first secondary winding N1 is higher than a preset value, after voltage division by the first resistor R1 and the second resistor R2, the sampling voltage at the sampling output end 13421A increases, so that the reference level voltage of the controllable precision voltage regulator K1 increases. When the sampling voltage is higher than the reference voltage of the reference level, the negative electrode and the positive electrode of the controllable precision voltage regulator K1 are connected, so that the output of the first secondary winding N1 increases. The bus voltage at the output end decreases, causing the sampling voltage at the sampling output end 13421A to decrease. When the sampling voltage is lower than the reference voltage, the negative and positive electrodes of the controllable precision voltage stabilizing source K1 are disconnected, so that the bus voltage at the output end of the first secondary winding N1 increases. By repeating the above process, the sampling voltage can be dynamically stabilized at the reference voltage, so that the bus voltage at the output end of the first secondary winding N1 can be dynamically stabilized at a preset value, thereby achieving dynamic voltage stabilization of the bus voltage at the output end of the first secondary winding N1.

[0032] It can be understood that the bus voltage at the output end of the first secondary winding N1 is determined by the resistance values ​​of the first resistor R1 and the second resistor R2. The resistance values ​​of the first resistor R1 and the second resistor R2 can be set according to the maximum output voltage of the first output end 132A. In the embodiment of the present application, there is no specific limitation on the resistance values ​​of the first resistor R1 and the second resistor R2.

[0033] Please refer to Figure 3 In a specific embodiment, the switch circuit 13423 includes a fourth resistor R4 and a switch element Q1 connected in series, and a controlled end of the switch element Q1 is connected to the controller 1341 .

[0034] When the controller 1341 detects that at least one of the output voltages of the first output circuit 132 and the output voltage of the second output circuit 133 is higher than the bus voltage of the first secondary winding N1, the controller 1341 controls the switch element Q1 to turn on, so that the switch circuit 13423 is turned on, so that the fourth resistor R4 is connected in parallel with the second resistor R2, so that the total resistance of the second resistor R2 and the fourth resistor R4 becomes smaller, so that the voltage of the sampling output terminal 13421A becomes smaller and is less than the reference voltage, so that the negative electrode and the positive electrode of the controllable precision voltage stabilizing source K1 are disconnected, so that The bus voltage at the output end of the first secondary winding N1 is increased so that the sampling voltage at the sampling output end 13421A of the sampling circuit 13421 is increased until the sampling voltage is dynamically balanced at the reference voltage again, thereby dynamically stabilizing the bus voltage at the output end of the first secondary winding N1 at the increased bus voltage, so as to achieve a boost in the bus voltage at the output end of the first secondary winding N1, thereby improving the output efficiency of the first output circuit 132, and improving the output efficiency of the second output circuit 133, thereby improving the output efficiency of the charging circuit 13.

[0035] It can be understood that the switch element Q1 includes at least one of a bipolar junction transistor (BJT), a metal-oxide-semiconductor (MOS) and an electromagnetic relay. In the embodiment of the present application, the specific form of the switch element Q1 is not limited.

[0036] Exemplarily, the switch element Q1 may be a field effect tube. Specifically, the switch element Q1 may be an NMOS tube (N-Metal-Oxide-Semiconductor), the base of the NMOS tube being the controlled end of the switch element Q1, the drain of the NMOS tube being the input end of the switch element Q1, and the source of the NMOS tube being the output end of the switch element Q1. When the controller 1341 sends a high-level signal to the base of the NMOS tube, the drain and source of the NMOS tube are connected, thereby turning on the switch circuit 13423, so that the third resistor R3 is connected in parallel with the second resistor R2; when the controller 1341 sends a low-level signal to the base of the NMOS tube, the drain and source of the NMOS tube are disconnected, so that the switch circuit 13423 is turned off.

[0037] Furthermore, the switching circuit 13423 also includes a fifth resistor R5, a first end of the fifth resistor R5 is connected to the controlled end of the switching element Q1, and a second end of the fifth resistor R5 is connected to the output end of the switching element Q1. The fifth resistor R5 can be used to generate a voltage drop between the base and the source of the NMOS tube when the controller 1341 sends a high level to the NMOS tube, so as to facilitate the conduction of the NMOS tube.

[0038] It is understandable that the switch element Q1 may also be a PMOS tube (P-Metal-Oxide-Semiconductor), which will not be described in detail here.

[0039] 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 based on the directions or positional relationships shown in the drawings, it 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 used for illustrative purposes 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.

[0040] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A charging circuit, characterized in that: include: A transformer, the transformer comprising a primary winding, a first secondary winding and a second secondary winding, wherein the first secondary winding and the second secondary winding are both arranged corresponding to the primary winding; A first output circuit, comprising a first output port connected to an output end of the first secondary winding; A second output circuit comprises a DC-to-DC converter and a second output port connected to each other, wherein an input end of the DC-to-DC converter is connected to an output end of the second secondary winding; A control circuit is connected to the output end of the first secondary winding, the first output circuit and the second output circuit, and the control circuit is used to adjust the bus voltage at the output end of the first secondary winding according to the output voltages of the first output circuit and the second output circuit.

2. The charging circuit according to claim 1, characterized in that: The control circuit further comprises: a controller connected to the first output circuit and the second output circuit; A boost circuit is connected to the output end of the first secondary winding and the controller, is controlled by the controller and is used to increase the bus voltage.

3. The charging circuit according to claim 2, characterized in that: The boost circuit comprises: A sampling circuit, connected to the output end of the first secondary winding and having a sampling output end; A voltage stabilizing circuit connected to the output end of the first secondary winding and to the sampling output end; The switch circuit is connected to the sampling output terminal and the controller and is controlled by the controller. When the switch circuit is controlled to be turned on, the bus voltage is raised.

4. The charging circuit according to claim 3, characterized in that: The sampling circuit comprises: a first resistor, wherein a first end of the first resistor is connected to an output end of the first secondary winding; 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 grounded; and the first end of the second resistor is the sampling output end.

5. The charging circuit according to claim 3, characterized in that: The voltage stabilizing circuit comprises: a third resistor, a first end of the third resistor being connected to an output end of the first secondary winding; A controllable precision voltage-stabilizing source, wherein the negative electrode of the controllable precision voltage-stabilizing source is connected to the second end of the third resistor, the positive electrode of the controllable precision voltage-stabilizing source is grounded, and the reference electrode of the controllable precision voltage-stabilizing source is connected to the sampling output end.

6. The charging circuit according to claim 3, characterized in that: The switch circuit includes a fourth resistor and a switch element connected in series, and a controlled end of the switch element is connected to the controller.

7. The charging circuit according to claim 6, characterized in that: The switch element includes at least one of a triode, a field effect transistor and an electromagnetic relay.

8. The charging circuit according to claim 7, characterized in that: When the switch element is the field effect tube, the base of the field effect tube is the controlled end of the switch element, the drain of the field effect tube is the input end of the switch element, and the source of the field effect tube is the output end of the switch element; The switch circuit further comprises: A fifth resistor, wherein a first end of the fifth resistor is connected to the controlled end of the switch element, and a second end of the fifth resistor is connected to the output end of the switch element.

9. The charging circuit according to any one of claims 1 to 8, characterized in that: The first output circuit includes a first protocol chip, the first protocol chip is connected in series between the first secondary winding and the first output port, the second output circuit includes a second protocol chip, the second protocol chip is connected in series between the DC-DC converter and the second output port; and / or, The first output port includes at least one of a USB Type-C port and a USB-A port; the second output port includes at least one of a USB Type-C port and a USB-A port.

10. A charging device, characterized in that: include: case; A circuit board is arranged in the housing; The charging circuit according to any one of claims 1 to 9 is arranged on the circuit board.

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