Dual-port USB fast charging system and fast charging control circuit therein

Abstract

Provided are a dual-port USB fast charging system and a fast charging control circuit therein. The fast charging control circuit includes a load demand detection module, a load current sampling module, an AC / DC converter control module, and a switching voltage stabilizer module. For any USB port of the dual-port USB fast charging system: the load demand detection module is configured to obtain load demand information associated with the USB port, generate a reference voltage representation signal and a reference current representation signal based on the load demand information, and provide the reference voltage representation signal and the reference current representation signal to one of the AC / DC converter control module and the switching voltage stabilizer module; and the load current sampling module is configured to obtain an output current sampling signal associated with an output current of the USB port, generate an output current representation signal based on the output current sampling signal, and provide the output current representation signal to one of the AC / DC converter control module and the switching voltage stabilizer module.

Description

Technical Field

[0001] This invention relates to the field of circuits, and more specifically to a dual-port Universal Serial Bus (USB) fast charging system and the fast charging control circuit therein. Background Technology

[0002] With the rapid development of mobile electronic devices, people are using them more and more in their daily lives. Typically, each mobile electronic device has a dedicated adapter for charging it. If people use more than one mobile electronic device in their daily lives, it can be very inconvenient to store / carry each device's dedicated adapter and use them to charge the devices. Summary of the Invention

[0003] According to an embodiment of the present invention, a fast charging control circuit for a dual-port USB fast charging system includes a load demand detection module, a load current sampling module, an AC / DC converter control module, and a switching regulator module. For any USB port of the dual-port USB fast charging system: the load demand detection module is configured to acquire load demand information associated with the USB port, generate a reference voltage characterization signal and a reference current characterization signal based on the load demand information, and provide the reference voltage characterization signal and the reference current characterization signal to one of the AC / DC converter control module and the switching regulator module; the load current sampling module is configured to acquire an output current sampling signal associated with the output current of the USB port, generate an output current characterization signal based on the output current sampling signal, and provide the output current characterization signal to the AC / DC converter control module and the switching regulator module. The AC / DC converter control module is configured to acquire an output voltage characterization signal associated with the output voltage of the USB port when provided with a reference voltage characterization signal, a reference current characterization signal, and an output current characterization signal, and to control the AC / DC converter of the dual-port USB fast charging system to provide an output voltage at the USB port that matches the load demand information based on the reference voltage characterization signal, the reference current characterization signal, the output current characterization signal, and the output voltage characterization signal; the switching regulator module is configured to acquire an output voltage characterization signal associated with the output voltage of the USB port when provided with a reference voltage characterization signal, a reference current characterization signal, and an output current characterization signal, and to provide an output voltage at the USB port that matches the load demand information based on the reference voltage characterization signal, the reference current characterization signal, the output current characterization signal, and the output voltage characterization signal. Attached Figure Description

[0004] The invention can be better understood from the following description of specific embodiments of the invention in conjunction with the accompanying drawings, wherein:

[0005] Figure 1 and Figure 2 Example block diagrams of existing dual-port USB adapters are shown below;

[0006] Figure 3 An example block diagram of a fast charging control circuit for use in a dual-port USB fast charging system according to an embodiment of the present invention is shown;

[0007] Figure 4 An example block diagram of a dual-port USB fast charging system according to an embodiment of the present invention is shown;

[0008] Figure 5 It shows Figure 4 The signal timing diagrams for each switch control port and USB port are shown. Detailed Implementation

[0009] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific configurations and algorithms presented below, but covers any modifications, substitutions, and improvements to elements, components, and algorithms without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description in order to avoid unnecessarily obscuring the invention.

[0010] A multi-port USB fast charging system can flexibly configure the output voltage and output current of each USB port according to the load demand information associated with each USB port (i.e., the voltage and / or current information required for charging the mobile electronic devices connected to each USB port as loads), thus enabling it to charge multiple mobile electronic devices simultaneously. Figure 1 and Figure 2 Example block diagrams of a dual-port USB adapter, which serve as an example implementation of a multi-port USB fast charging system, are shown below:

[0011] exist Figure 1In the dual-port USB adapter shown, a single fast charging control circuit communicates with the mobile electronic device acting as a load. The fast charging control circuit feeds back the load demand information to the AC / DC converter via an optocoupler to boost and / or buck the output voltages VBUS1 and VBUS2 on the two USB ports. When both USB ports detect a load, the fast charging control circuit cannot communicate with either of the mobile electronic devices acting as a load, so it can only charge the mobile electronic device with low voltage and low current. While charging a mobile electronic device acting as a load via one of the USB ports, if another mobile electronic device is connected to the other USB port as a load, the charging mobile electronic device will stop charging during the period when there is no output voltage on its connected USB port.

[0012] exist Figure 2 The dual-port USB adapter shown uses two separate fast charging control circuits to communicate with different mobile electronic devices that act as loads. Each fast charging control circuit integrates a switching regulator and a fast charging protocol, thus enabling independent output from the two USB ports. The output power of the AC / DC converter needs to be greater than the sum of the output power of the two fast charging control circuits to avoid the AC / DC converter failing due to overload when all switching regulators are operating at full power. When only one USB port is operating at full power, the AC / DC converter has a very large power redundancy, at the cost of a larger transformer, higher-specification power devices, and dual switching regulators, all of which result in a larger size and greater cost waste.

[0013] Given Figure 1 and Figure 2 The dual-port USB adapter shown has one or more problems, and a dual-port USB fast charging system and fast charging control circuit therein are proposed according to embodiments of the present invention.

[0014] Figure 3 An example block diagram of a fast charging control circuit for use in a dual-port USB fast charging system according to an embodiment of the present invention is shown. Figure 3As shown, the fast charging control circuit 300 includes a load demand detection module 302, a load current sampling module 304, an AC / DC converter control module 306, and a switching regulator module 308. For any USB port in the dual-port USB fast charging system (e.g., USB1 / USB2 port): the load demand detection module 302 is configured to acquire load demand information associated with the USB port (e.g., load demand 1 / load demand 2), generate reference voltage characterization signals (e.g., VREF1 / VREF2) and reference current characterization signals (e.g., IREF1 / IREF2) based on the load demand information, and provide the reference voltage characterization signals and reference current characterization signals to one of the AC / DC converter control module 306 and the switching regulator module 308; the load current sampling module 304 is configured to acquire an output current sampling signal associated with the output current of the USB port (e.g., ILOAD1 / ILOAD2), and generate an output current characterization signal (e.g., IFB1 / IFB2) based on the output current sampling signal. The AC / DC converter control module 306 and the switching regulator module 308 are configured to, when provided with a reference voltage characterization signal, a reference current characterization signal, and an output current characterization signal, acquire an output voltage characterization signal (e.g., VFB1 / VFB2) associated with the output voltage of the USB port, and control the AC / DC converter of the dual-port USB fast charging system to provide an output voltage at the USB port that matches the load demand information based on the reference voltage characterization signal, the reference current characterization signal, the output current characterization signal, and the output voltage characterization signal; the switching regulator module 308 is configured to, when provided with a reference voltage characterization signal, a reference current characterization signal, and an output current characterization signal, acquire an output voltage characterization signal associated with the output voltage of the USB port, and provide an output voltage at the USB port that matches the load demand information based on the reference voltage characterization signal, the reference current characterization signal, the output current characterization signal, and the output voltage characterization signal.

[0015] For example, when USB1 port is connected to AC / DC converter control module 306 and USB2 port is connected to switching regulator module 308, load demand detection module 302 can provide the reference voltage characterization signal VREF1 and reference current characterization signal IREF1 associated with USB1 port to AC / DC converter control module 306, and provide the reference voltage characterization signal VREF2 and reference current characterization signal IREF2 associated with USB2 port to switching regulator module 308; load current sampling module 304 can provide the output current characterization signal IFB1 associated with output current ILOAD1 of USB1 port to AC / DC converter control module 306, and provide the output current characterization signal IFB2 associated with output current ILOAD2 of USB2 port to switching regulator module 308; A The C / DC converter control module 306 can acquire the output voltage characterization signal VFB1 associated with the output voltage of the USB1 port, and control the AC / DC converter to provide a first load demand voltage VLOAD1 (i.e., the output voltage matching load demand 1) at the USB1 port based on the reference voltage characterization signal VREF1, the reference current characterization signal IREF1, the output current characterization signal IFB1, and the output voltage characterization signal VFB1; the switching regulator module 308 can acquire the output voltage characterization signal VFB2 associated with the output voltage of the USB2 port, and provide a second load demand voltage VLOAD2 (i.e., the output voltage matching load demand 2) at the USB2 port based on the reference voltage characterization signal VREF2, the reference current characterization signal IREF2, the output current characterization signal IFB2, and the output voltage characterization signal VFB2.

[0016] According to an embodiment of the present invention, the fast charging control circuit 300 can realize fast charging functions for different loads through the AC / DC converter control module 306 and the switching regulator module 308 respectively. At the same time, it does not require devices that provide power redundancy, such as larger transformers or higher-specification power devices, and does not require dual-channel switching regulators. Therefore, it is smaller in size and lower in cost.

[0017] like Figure 3 As shown, in some embodiments, the load demand detection module 302 may also be configured to control the load current sampling module 304 to provide an output current characterization signal (e.g., IFB1 / IFB2) associated with the output current of any USB port (e.g., USB1 / USB2 port) to one of the AC / DC converter control module 306 and the switching regulator module 308, so that a reference voltage characterization signal, a reference current characterization signal, and an output current characterization signal associated with the same USB port are provided to the same AC / DC converter control module and the switching regulator module.

[0018] For example, when the load demand detection module 302 provides the reference voltage characterization signal VREF1 and the reference current characterization signal IRF1 associated with the USB1 port to the AC / DC converter control module 306, the load current sampling module 304 controls the load current sampling module 304 to provide the output current characterization signal IFB1 associated with the output current of the USB1 port to the AC / DC converter control module 306.

[0019] like Figure 3 As shown, in some embodiments, the load demand detection module 302 can also be configured to connect the USB ports to corresponding modules in the AC / DC converter control module 306 and the switching regulator module 308 based on the load demand information of each USB port. For example, the load demand detection module 302 can connect the USB1 port to the AC / DC converter control module 306 or the switching regulator module 308 by controlling the closing and opening of switch S1 located between the USB1 port and the AC / DC converter control module 306 and switch S2 located between the USB1 port and the switching regulator module 308; and connect the USB2 port to the AC / DC converter control module 306 or the switching regulator module 308 by controlling the closing and opening of switch S3 located between the USB2 port and the AC / DC converter control module 306 and switch S4 located between the USB2 port and the switching regulator module 308. Here, in the initial state where no load is connected to any USB port, switches S1, S2, S3, and S4 are all in the open state, and the switching regulator module 308 is in a sleep state (i.e., not working).

[0020] like Figure 3As shown, in some embodiments, the load demand detection module 302 can also be configured to, when the first USB port (e.g., USB1 port) of the dual-port USB fast charging system detects a first load (e.g., LOAD1) and the second USB port (e.g., USB2 port) does not detect any load: connect the first USB port to the AC / DC converter control module 306 (e.g., control switch S1 to change from an open state to a closed state, and control switches S2, S3, and S4 to remain in the open state), provide the first reference voltage characterization signal (e.g., VREF1) and the first reference current characterization signal (e.g., IREF1) associated with the first USB port to the AC / DC converter control module 306, and control the load current sampling module 304 to provide the first output current characterization signal (e.g., IFB1) associated with the output current of the first USB port to the AC / DC converter control module 306. In this way, the AC / DC converter control module 306 can acquire a first output voltage characterization signal (e.g., VFB1) associated with the output voltage of the first USB port, and control the AC / DC converter to provide a first load demand voltage (e.g., VLOAD1) at the first USB port based on the first reference voltage characterization signal, the first reference current characterization signal, the first output current characterization signal, and the first output voltage characterization signal.

[0021] like Figure 3 As shown, in some embodiments, the load demand detection module 302 may also be configured to, when the second USB port (e.g., USB2 port) detects a second load during the charging of the first load (e.g., LOAD1) based on the output voltage provided by the AC / DC converter at the first USB port (e.g., USB1 port), when the first load demand voltage (e.g., VLOAD1) associated with the first USB port is greater than or equal to the second load demand voltage (e.g., VLOAD2) associated with the second USB port: connect the second USB port to the switching regulator module 308, provide the second reference voltage characterization signal (e.g., VREF2) and the second reference current characterization signal (e.g., IREF2) associated with the second USB port to the switching regulator module 308, and control the load current sampling module 304 to provide the second output current characterization signal (e.g., IFB2) associated with the output current of the second USB port to the switching regulator module 308. In this way, the switching regulator module 308 can acquire a second output voltage characterization signal (e.g., VFB2) associated with the output voltage of the second USB port, and provide a second load demand voltage (e.g., VLOAD2) at the second USB port based on the second reference voltage characterization signal, the second reference current characterization signal, the second output current characterization signal, and the second output voltage characterization signal.

[0022] like Figure 3 As shown, in some embodiments, the load demand detection module 302 can also be configured to, when the second USB port (e.g., USB2) detects a second load during the charging of the first load (e.g., LOAD1) based on the output voltage provided by the AC / DC converter at the first USB port (e.g., USB1 port), when the first load demand voltage (e.g., VLOAD1) associated with the first USB port is less than the second load demand voltage (e.g., VLOAD2) associated with the second USB port: simultaneously provide a first reference voltage characterization signal (e.g., VREF1) and a first reference current characterization signal (IREF1) associated with the first USB port to the AC / DC converter control module 306 and the switching regulator module 308, and control the load current sampling module 304 to simultaneously provide a first output current characterization signal (e.g., IFB1) associated with the output current of the first USB port to the AC / DC converter control module 306 and the switching regulator module 308; when the switching regulator When the output voltage of module 308 reaches the first load requirement voltage (e.g., VLOAD1), the first USB port is switched from being connected to the AC / DC converter control module 306 to being connected to the switching regulator module 308. A first reference voltage characterization signal and a first reference current characterization signal associated with the first USB port are provided to the switching regulator module 308. The load current sampling module 304 is controlled to provide a first output current characterization signal associated with the output current of the first USB port to the switching regulator module 308. The second USB port is connected to the AC / DC converter control module 306. A second reference voltage characterization signal (e.g., VREF2) and a second reference current characterization signal (IREF2) associated with the second USB port are provided to the AC / DC converter control module 306. The load current sampling module 304 is controlled to provide a second output current characterization signal (IFB2) associated with the output current (ILOAD2) of the second USB port to the AC / DC converter control module 306.

[0023] For example, during the charging process of load LOAD1 based on the output voltage VLOAD1 provided by the AC / DC converter at the USB1 port (at this time, the load demand detection module 302 controls switch S1 to be closed, switches S2, S3, and S4 to be open, and detects load demand 1), if the USB2 port detects load LOAD2 (i.e., detects load demand 2), the load demand detection module 302 first compares the voltage demand of load demand 1 and load demand 2 and performs the following processing:

[0024] If the voltage requirement of load demand 1 is greater than or equal to the voltage requirement of load demand 2, then switch S1 remains closed, and the reference voltage characterization signal VREF1 and reference current characterization signal IREF1 associated with the USB1 port are kept provided to the AC / DC converter control module 306. The load current sampling module 304 is also controlled to provide the output current characterization signal IFEB1 associated with the output current of the USB1 port to the AC / DC converter control module 306 (i.e., the output voltage of the USB1 port is kept constant and provided by the AC / DC converter). Simultaneously, switch S4 is controlled to change from open to closed, enabling the switching regulator module 308 to operate. The reference voltage characterization signal VREF2 and reference current characterization signal IREF2 associated with the USB2 port are provided to the switching regulator module 308, and the load current sampling module 304 is controlled to provide the output current characterization signal IFEB2 associated with the output current of the USB2 port to the switching regulator module 308 (i.e., the output voltage of the USB2 port is provided by the switching regulator module 308). Finally, switches S1 and S4 are closed, and switches S2 and S3 are open.

[0025] If the voltage requirement of load demand 1 is less than the voltage requirement of load demand 2, then switch S1 remains closed, and the reference voltage characterization signal VREF1 and reference current characterization signal IREF1 associated with the USB1 port are maintained on the AC / DC converter control module 306. The load current sampling module 304 is also controlled to provide the output current characterization signal IFEB1 associated with the output current of the USB1 port to the AC / DC converter control module 306 (i.e., the output voltage of the USB1 port is maintained to be provided by the AC / DC converter). Simultaneously, the reference voltage characterization signal VREF1 and reference current characterization signal IREF1 associated with the USB1 port are provided to the switching regulator module 308, and the load current sampling module 304 is controlled to provide the output current characterization signal IFEB1 associated with the output current of the USB1 port to the switching regulator module 308, enabling the switching regulator module 308 to operate. When the output voltage of module 308 reaches the voltage requirement of load demand 1, control switch S2 changes from the open state to the closed state and control switch S1 changes from the closed state to the open state (that is, the USB1 port is switched from being connected to AC / DC converter control module 306 to being connected to switching regulator module 308). The switching regulator module 308 provides the output voltage at the USB1 port. At the same time, control switch S3 changes from the open state to the closed state, and provides the reference voltage characterization signal VREF2 and reference current characterization signal IREF2 associated with the USB2 port to AC / DC converter control module 306. It also controls the load current sampling module 304 to provide the output current characterization signal IFEB2 associated with the output current of the USB2 port to AC / DC converter control module 306 (that is, the output voltage of the USB2 port is provided by the AC / DC converter). Finally, switches S2 and S3 are in the closed state, and switches S1 and S4 are in the open state.

[0026] As can be seen, when the load LOAD1 is charging based on the output voltage VLOAD1 provided by the AC / DC converter at the USB1 port, and the USB2 port detects the load LOAD2, the output voltage of the USB1 port will not change due to the connection of the load LOAD2. Therefore, the load LOAD1 will not stop charging.

[0027] like Figure 3As shown, in some embodiments, during the charging of the first load based on the first load demand voltage (e.g., VLOAD1) provided by the AC / DC converter at the first USB port and the second load based on the second load demand voltage (VLOAD2) provided by the switching regulator module 308 at the second USB port, when the second USB port (e.g., USB2 port) requests to increase the second load demand voltage to a voltage value greater than the first load demand voltage, the load demand detection module 302 can also be configured to: simultaneously provide the first reference voltage characterization signal (e.g., VREF1) and the first reference current characterization signal (e.g., IREF1) associated with the first USB port to the AC / DC converter control module 306 and the switching regulator module 308, and control the load current sampling module 304 to simultaneously provide the first output current characterization signal (e.g., IFB1) associated with the output current of the first USB port to the AC / DC converter control module 306 and the switching regulator module 308 (at this time, the output voltage of the first USB port is still provided by the AC / DC converter, and the output voltage of the second USB port is still provided by the switching regulator module 308); when When the output voltage of the switching regulator module 308 reaches the first load requirement voltage, the first USB port is switched from being connected to the AC / DC converter control module 306 to being connected to the switching regulator module 308. A first reference voltage characterization signal and a first reference current characterization signal associated with the first USB port are provided to the switching regulator module 308. The load current sampling module 304 is controlled to provide a first output current characterization signal associated with the output current of the first USB port to the switching regulator module 308 (at this time, the output voltage of the first USB port is provided by the switching regulator module 308). The second USB port is switched from being connected to the switching regulator module 308 to being connected to the AC / DC converter control module 306. A second reference voltage characterization signal (e.g., VREF2) and a second reference current characterization signal (IREF2) associated with the second USB port are provided to the AC / DC converter control module 306. The load current sampling module is controlled to provide a second output current characterization signal (IFB2) associated with the output current of the second USB port to the AC / DC converter control module (at this time, the output voltage of the second USB port is provided by the AC / DC converter).

[0028] Figure 4 An example block diagram of a dual-port USB fast charging system according to an embodiment of the present invention is shown, wherein the switching regulator adopts a DC-to-DC buck topology. Figure 5 It shows Figure 4The signal timing diagrams for the various switch control ports and USB ports are shown below. In these diagrams, H represents a high-level output from the switch control ports (PORTA / B / C / D) (i.e., the corresponding switch is on), and L represents a low-level output from the switch control ports (PORTA / B / C / D) (i.e., the corresponding switch is off). Figure 4 and Figure 5 As shown, the dual-port USB fast charging system 400 includes a fast charging control circuit 300, an AC / DC converter, a USB Type CA port, and a USB Type CB port. Specifically: during times 0 to T1, the first load demand voltage associated with the USB Type CA port is 9V, the second load demand voltage associated with the USB Type CB port is 5V, the output voltage VIN of the AC / DC converter is 9V, the output voltage of the Buck switching regulator is 5V, and switches A and D are in the ON state. The AC / DC converter supplies power to the USB Type CA port, and the Buck switching regulator supplies power to the USB Type CB port. During time T1, the USB Type CB port requests to boost the second load demand voltage to 15V, and the fast charging control circuit controls the output voltage of the Buck switching regulator to boost to 9V. During times T1 to T2, switches A and D remain in the ON state, and switches B and C remain in the OFF state. The AC / DC converter supplies power to the USB Type CA port, and the Buck switching regulator supplies power to the USB Type CB port. Power is supplied to the CB port; at time T2, the output voltage of the Buck switching regulator is boosted to 9V, switches A and D change from the on state to the off state, and switches B and C change from the off state to the on state. The AC / DC converter supplies power to the USB Type CB port, and the Buck switching regulator supplies power to the USB Type CA port. At the same time, the fast charging control circuit requests the output voltage of the AC / DC converter to be boosted to 15V; at time T3, the output voltage of the AC / DC converter is boosted to 15V. At this point, the output voltage of the USB Type CA port is the first load requirement voltage of 9V, and the output voltage of the USB Type CB port is the second load requirement voltage of 15V. Finally, switches A and D are in the off state and switches B and C are in the on state. The AC / DC converter provides a 15V output voltage at the USB Type CB port, and the Buck switching regulator provides a 9V output voltage at the USB Type CB port.

[0029] like Figure 3As shown, in some embodiments, the AC / DC converter control module 306 may also be configured to feed back load demand information associated with the USB port to the AC / DC converter via an optocoupler, thereby controlling the AC / DC converter to provide an output voltage at the USB port that matches its load demand information. For example, the AC / DC converter control module may include a voltage divider network (e.g., voltage divider network 1), a control loop (including error amplifiers EA1 and EA2 and voltage isolation buffers BUF1 and BUF2), and an optocoupler drive circuit (not shown), wherein: the voltage divider network is configured to acquire an output voltage characterization signal; the control loop is configured to generate an optocoupler drive control signal based on a reference voltage characterization signal, a reference current characterization signal, an output current characterization signal, and an output voltage characterization signal; and the optocoupler drive circuit is configured to drive the optocoupler based on the optocoupler drive control signal to feed back the load demand information to the AC / DC converter via the optocoupler.

[0030] like Figure 3 As shown, in some embodiments, the load demand detection module 302 can also be configured to communicate with the load connected to the USB port based on a charging protocol to obtain load demand information. For example, when the USB port is a USB-A port, the load demand detection module 302 can communicate with the mobile electronic device acting as the load based on one or more protocols such as Quick Charge (QC), Firewall Communication Protocol (FCP), Adaptive Fast Charge (AFC), and Standard Communication Protocol (SCP); when the USB port is a USB Type C port, the load demand detection module 302 can communicate with the mobile electronic device acting as the load based on the Power Delivery (PD) protocol.

[0031] This invention can be implemented in other specific forms without departing from its spirit and essential characteristics. For example, the algorithm described in a particular embodiment can be modified without departing from the basic spirit of the invention. Therefore, the present embodiments are to be regarded as exemplary rather than limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and all changes falling within the meaning and scope of the claims and their equivalents are thus included within the scope of the invention.

Claims

1. A fast charging control circuit for use in a dual-port USB fast charging system, comprising a load demand detection module, a load current sampling module, an AC / DC converter control module, and a switching regulator module, wherein: The load demand detection module is configured to acquire first load demand information associated with a first USB port and second load demand information associated with a second USB port, generate a first reference voltage characterization signal and a first reference current characterization signal associated with the first USB port based on the first load demand information, generate a second reference voltage characterization signal and a second reference current characterization signal associated with the second USB port based on the second load demand information, provide the first reference voltage characterization signal and the first reference current characterization signal to the AC / DC converter control module, and provide the second reference voltage characterization signal and the second reference current characterization signal to the switching regulator module; The load current sampling module is configured to acquire a first output current sampling signal associated with the output current of the first USB port and a second output current sampling signal associated with the output current of the second USB port, generate a first output current characterization signal based on the first output current sampling signal, generate a second output current characterization signal based on the second output current sampling signal, provide the first output current characterization signal to the AC / DC converter control module, and provide the second output current characterization signal to the switching regulator module. The AC / DC converter control module is configured to acquire a first output voltage characterization signal associated with the output voltage of the first USB port, and control the AC / DC converter of the dual-port USB fast charging system to provide an output voltage at the first USB port that matches the first load demand information based on the first reference voltage characterization signal, the first reference current characterization signal, the first output current characterization signal, and the first output voltage characterization signal. The switching regulator module is configured to acquire a second output voltage characterization signal associated with the output voltage of the second USB port, and to provide an output voltage at the second USB port that matches the second load demand information based on the second reference voltage characterization signal, the second reference current characterization signal, the second output current characterization signal, and the second output voltage characterization signal.

2. The fast charging control circuit as described in claim 1, wherein, The load demand detection module is further configured to control the load current sampling module to provide the first output current characterization signal to the AC / DC converter control module and the second output current characterization signal to the switching regulator module, so that the first reference voltage characterization signal, the first reference current characterization signal, and the first output current characterization signal are provided to the AC / DC converter control module and the second reference voltage characterization signal, the second reference current characterization signal, and the second output current characterization signal are provided to the switching regulator module.

3. The fast charging control circuit as described in claim 1, wherein, The load demand detection module is further configured to connect the first USB port to the AC / DC converter control module based on the first load demand information, and to connect the second USB port to the switching regulator module based on the second load demand information.

4. The fast charging control circuit as described in claim 1, wherein, The load demand detection module is also configured to detect a first load at the first USB port and no load at the second USB port: Connect the first USB port to the AC / DC converter control module. The first reference voltage characterization signal and the first reference current characterization signal are provided to the AC / DC converter control module, and The load current sampling module is controlled to provide the first output current characterization signal to the AC / DC converter control module.

5. The fast charging control circuit as described in claim 4, wherein, The load demand detection module is further configured to, when the second USB port detects a second load during the charging of the first load based on the output voltage provided by the AC / DC converter at the first USB port, if the first load demand voltage associated with the first USB port is greater than or equal to the second load demand voltage associated with the second USB port: Connect the second USB port to the switching regulator module. The second reference voltage characterization signal and the second reference current characterization signal are provided to the switching regulator module, and The load current sampling module is controlled to provide the second output current characterization signal to the switching regulator module.

6. The fast charging control circuit as described in claim 4, wherein, The load demand detection module is further configured to, when the second USB port detects a second load during the charging of the first load based on the output voltage provided by the AC / DC converter at the first USB port, if the first load demand voltage associated with the first USB port is less than the second load demand voltage associated with the second USB port: The first reference voltage characterization signal and the first reference current characterization signal are simultaneously provided to the AC / DC converter control module and the switching regulator module, and the load current sampling module is controlled to simultaneously provide the first output current characterization signal to the AC / DC converter control module and the switching regulator module. When the output voltage of the switching regulator module reaches the first load requirement voltage... The first USB port is switched from being connected to the AC / DC converter control module to being connected to the switching regulator module. The first reference voltage characterization signal and the first reference current characterization signal are provided to the switching regulator module. The load current sampling module is then controlled to provide the first output current characterization signal to the switching regulator module. Connect the second USB port to the AC / DC converter control module, provide the second reference voltage characterization signal and the second reference current characterization signal to the AC / DC converter control module, and control the load current sampling module to provide the second output current characterization signal to the AC / DC converter control module.

7. The fast charging control circuit as described in claim 5, wherein, The load demand detection module is also configured to, when the second USB port requests to increase the second load demand voltage to a value greater than the first load demand voltage: The first reference voltage characterization signal and the first reference current characterization signal are simultaneously provided to the AC / DC converter control module and the switching regulator module, and the load current sampling module is controlled to simultaneously provide the first output current characterization signal to the AC / DC converter control module and the switching regulator module. When the output voltage of the switching regulator module reaches the first load requirement voltage... The first USB port is switched from being connected to the AC / DC converter control module to being connected to the switching regulator module. The first reference voltage characterization signal and the first reference current characterization signal are provided to the switching regulator module. The load current sampling module is then controlled to provide the first output current characterization signal to the switching regulator module. Switch the second USB port from being connected to the switching regulator module to being connected to the AC / DC converter control module, provide the second reference voltage characterization signal and the second reference current characterization signal to the AC / DC converter control module, and control the load current sampling module to provide the second output current characterization signal to the AC / DC converter control module.

8. The fast charging control circuit as described in claim 1, wherein, The AC / DC converter control module is also configured to feed back the first load demand information to the AC / DC converter via an optocoupler, so as to control the AC / DC converter to provide an output voltage at the first USB port that matches the first load demand information.

9. The fast charging control circuit as described in claim 8, wherein, The AC / DC converter control module includes a voltage divider network, a control loop, and an optocoupler drive circuit, wherein: The voltage divider network is configured to acquire the first output voltage characterization signal; The control loop is configured to generate an optocoupler drive control signal based on the first reference voltage characterization signal, the first reference current characterization signal, the first output current characterization signal, and the first output voltage characterization signal. The optocoupler driving circuit is configured to drive the optocoupler based on the optocoupler driving control signal, so as to feed back the first load demand information to the AC / DC converter via the optocoupler.

10. The fast charging control circuit as described in claim 1, wherein, The load demand detection module is also configured to communicate with the loads connected to the first USB port and the second USB port based on the charging protocol to obtain the first load demand information and the second load demand information.

11. A dual-port USB fast charging system, comprising the fast charging control circuit according to any one of claims 1 to 10.

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