CN111404232A - A fast charging switching circuit and method based on dual-interface plugging detection - Google Patents

Abstract

The invention discloses a fast charging switching circuit and method based on dual-interface plug-in detection. The circuit includes a power supply terminal, a rectifier and transformer circuit, a control system, a USB Type-A interface, a USB Type-C interface, a rectifier and transformer circuit and A filter and degaussing circuit is connected between the USB Type‑A interface and the USB Type‑C interface, a switch unit is connected to the USB Type‑A interface and the USB Type‑C interface, and the control system is connected to the rectifier and transformer circuit and the USB Type‑A interface , between the USB Type-C interfaces, the control system includes a fast charge control unit and a plug-in detection unit. The method of the present invention is applied to the circuit described above. The invention can save the cost of circuit design, expand the range of detectable equipment, more efficient and time-saving in scene switching, and better meet the demand of fast charging.

Description

A fast charging switching circuit and method based on dual-interface plugging detection

【Technical field】

The invention relates to the technical field of fast charging, in particular to a fast charging switching circuit based on dual-interface plugging detection and a fast charging switching method applied to the circuit.

【Background technique】

In recent years, with the development of fast charging technology, more and more USB interface forms have emerged. As the latest interface form technology, TYPE-C is powerful and easy to use. In the current situation of more and more electronic devices, it is sometimes necessary to charge multiple electronic devices. In order to better take into account different USB interface forms, there are many dual-port charging solutions on the market. However, some detections of the existing solutions are not flexible enough, the action logic cannot adapt to the actual situation, and the efficiency is low. On the other hand, the more efficient ones have complex internal circuits, resulting in higher manufacturing costs for the required hardware circuits.

In the technical solution of the prior art, the A and C ports are not independent, and only 5V charging is supported when the dual-port NMOS is turned on. Re-awakening the fast charging requires plugging and unplugging, which is not flexible enough to switch according to the corresponding situation.

In the technical solution of the prior art 2, ports A and C are independent, and the two ports work separately. When the two ports are inserted, both ports A and C can perform fast charging, but the manufacturing cost is relatively high.

Therefore, for some low-current devices, if the corresponding NMOS is turned off during insertion, it is not easy to detect the insertion; in the case where the dual-port NMOS is turned on, only 5V charging can be performed, and the load cannot be detected flexibly; the cost is high and the space is occupied larger.

[Content of the invention]

The main purpose of the present invention is to provide a fast charging switching circuit based on dual-interface plug detection, which can save circuit design costs, expand the range of detectable devices, make scene switching more efficient and time-saving, and better meet the needs of fast charging.

Another object of the present invention is to provide a fast charging switching circuit based on dual-interface unplug detection and fast charging switching, which can save circuit design costs, expand the range of detectable devices, make scene switching more efficient and time-saving, and better meet the needs of fast charging. method.

In order to achieve the above main purpose, the present invention provides a fast charging switching circuit based on dual-interface plug-in detection, which includes a power supply terminal, a rectifier and transformer circuit, a control system, a USB Type-A interface, and a USB Type-C interface. The power supply terminal inputs the power supply voltage to the rectifier and transformer circuit, and a filter and degaussing circuit is connected between the rectifier and transformer circuit and the USB Type-A interface and the USB Type-C interface. A switch unit is connected to the Type-C interface, and the control system is connected between the rectifier and transformer circuit and the USB Type-A interface and the USB Type-C interface; the control system includes a fast charging control unit and a plug-in A pull-out detection unit, the plug-in detection unit detects the device plug-in signal of the USB Type-A interface and the USB Type-C interface respectively, and the fast charge control unit generates a switch control signal according to the detected device plug-in signal, so The fast charging control unit sends a switch signal to the switch circuit according to the switch control signal to turn on/off the charging path from the power supply terminal to the USB Type-A interface and the USB Type-C interface.

A further solution is that the fast charging control unit includes a first fast charging control circuit and a second fast charging control circuit, the plugging detection unit includes a first plugging detection circuit and a second plugging detection circuit, and the switch The unit includes a first switch circuit and a second switch circuit, the first plug detection circuit detects the device plug signal of the USB Type-A interface, and the first fast charge control circuit is based on the detected USB Type The device plug-in signal of the -A interface generates a first switch control signal, and the first fast charge control circuit sends a switch signal to the first switch circuit according to the first switch control signal to turn on/off the power terminal The charging path to the USB Type-A interface; the second plug-in detection circuit detects the device plug-in signal of the USB Type-C interface, and the second fast charge control circuit is based on the detected USB Type-C interface. The device plug-in signal of the -C interface generates a second switch control signal, and the second fast charge control circuit sends a switch signal to the second switch circuit according to the second switch control signal to turn on/off the power terminal A charging path to the USB Type-C interface.

In a further solution, the first switch circuit and the second switch circuit are both MOS transistor switch circuits.

A further solution is that the first fast charge control circuit includes the first fast charge control circuit includes a first fast charge protocol control circuit, a first MTK fast charge control unit, a first DCP protocol circuit, and a first port control circuit. circuit, wherein the enabling terminals of the first fast charging protocol control circuit, the first MTK fast charging control unit, and the first DCP protocol circuit are respectively electrically connected to the first plugging detection circuit through the first port control circuit.

A further solution is that the second fast charge control circuit includes a second fast charge protocol control circuit, a second MTK fast charge control unit, a second DCP protocol circuit, a second port control circuit, and a PD control circuit, and the first The enabling terminals of the second fast charging protocol control circuit, the second MTK fast charging control unit, the second DCP protocol circuit, and the PD control circuit are respectively electrically connected to the second plugging detection circuit through the second port control circuit.

It can be seen that the present invention uses the USB Type-A interface to be normally open, and the USB Type-C interface also maintains the normally open state when the CC connection is established; in the normal charging state, the switch ground circuits of the two interfaces can be kept normally open status, which is conducive to detecting the insertion of low-current devices and improves the versatility of applications; the two interfaces respectively support a variety of fast charging protocols and have excellent protocol compatibility; when both interface MOS tube switch circuits are turned on, When one interface is lightly loaded, the other interface can still resume fast charging; circuit design costs can be saved, and the cost is lower; the range of detectable devices can be expanded; context switching is more efficient and time-saving, and can meet the fast charging needs as much as possible.

Therefore, compared with the traditional solution, the present invention has a more sensitive detection device capability, and both interfaces are kept open as far as possible, so that low-current devices can be detected more accurately, and for some charging scenarios, it can be more effective and time-saving. Complete the state switch.

In order to achieve the above-mentioned other object, the present invention also provides a fast charging switching method based on dual-interface plugging detection and fast charging switching circuit, which is applied to a fast charging switching circuit based on dual-interface plugging detection. Including, after it is determined that the system is in the power-on state, real-time detection of whether the loading state and charging mode of the two interfaces have changed. The MOS transistor switch circuits of the interface are all in the open state, then it is judged whether the current state of the USB Type-A interface is the overload state. After determining that the current state of the USB Type-A interface is the overload state, it is judged whether the current state of the USB Type-C interface is In the overloaded state, if the current state of the two interfaces is in the overloaded state, turn off the fast charging enable, simulate USB plugging and unplugging of the two interfaces, and enter the normal charging state; if it is determined that the current state of the USB Type-A interface is not overloaded If not, it can be determined that the USB Type-C interface is in a heavy load state, and then it is judged whether to enable fast charging, and if not, turn off USB Type-C The MOS tube switch circuit of the interface is controlled to enable fast charging, simulate USB plugging and unplugging of the USB Type-C interface, and perform the opening and closing operation of the MOS tube switch circuit to prompt the USB Type-C interface to re-apply for fast charging. , when the USB Type-C interface enters the fast charging state, the USB Type-A interface remains normally open.

A further solution is to determine whether the current state of the USB Type-C interface is an overloaded state after determining that the current state of the USB Type-A interface is an overloaded state. Whether the current state of each interface is in the light-load state, if not, then judge whether to enable fast charging; The A interface is simulated by USB plugging and unplugging, and the MOS tube switch circuit is turned on and off to prompt the USB Type-A interface to re-apply for fast charging. When the USB Type-A interface enters the fast charging state, if the USB Type-C interface is not established CC connection, then close the USB Type-C interface.

A further solution is that after determining that the USB Type-C interface is in an overloaded state, if the fast charge enablement has been turned on, it is determined whether the USB Type-C interface enters the fast charge mode. If so, the USB Type-C interface enters the fast charge mode. Charging status; after confirming that the current status of the USB Type-A interface is overloaded, if the fast charging has been enabled, it is determined whether the USB Type-A interface enters the fast charging state. If so, the USB Type-A interface enters the fast charging state. state.

A further solution is that when judging whether the current state of the MOS tube switch circuit of the two interfaces is in the open state, if only the MOS tube switch circuit of a single USB Type-A interface or USB Type-C interface is in the open state, then it is judged that a single Whether the USB Type-A interface or the USB Type-C interface is in a light load state, if so, open the closed interface so that both interfaces are open.

A further solution is to determine whether the USB Type-C interface has established a CC connection if both interfaces are in a light-load state and both interfaces are in an open state, and if not, close the USB Type-C interface. ; If it is determined that the USB Type-C interface establishes a CC connection, the current state is maintained, that is, both interfaces remain open.

It can be seen that the method of the present invention increases the normally open function of the corresponding port, and can more accurately judge the plugging and unplugging of various devices in different scenarios; the open and close conditions of the MOS switch circuit enable the device to switch between normal charging and fast charging. More flexible; any single port of the AC supports a variety of fast charging protocols, and the dual-port plug-in is automatically recognized and reduced to 5V charging when it is overloaded, which can limit the power to ensure safety; when one interface enters a light load, the interface under heavy load can be used. To restore fast charging, keep the two interface MOS switch circuits normally open under conditions to ensure that devices with different characteristics can be identified and inserted.

Therefore, compared with the traditional solution, the present invention has a more sensitive detection device capability, and both interfaces are kept open as far as possible, so that low-current devices can be detected more accurately, and for some charging scenarios, it can be more effective and time-saving. Complete the state switch.

【Description of drawings】

FIG. 1 is a schematic diagram of an embodiment of a fast charging switching circuit based on dual-interface plug-in detection according to the present invention.

FIG. 2 is a circuit schematic diagram of a first fast-charging control circuit in an embodiment of a fast-charging switching circuit based on dual-interface unplugging detection according to the present invention.

3 is a circuit schematic diagram of a second fast charging control circuit in an embodiment of a fast charging switching circuit based on dual-interface plugging detection according to the present invention.

4 is a circuit schematic diagram of a USB Type-A interface, a first switch circuit, and a first plug detection circuit in an embodiment of a fast charge switching circuit based on dual-interface plug-in detection according to the present invention.

FIG. 5 is a circuit schematic diagram of a USB Type-C interface and a second switch circuit in an embodiment of a fast charging switching circuit based on dual-interface unplugging detection according to the present invention.

FIG. 6 is a circuit schematic diagram of a first plugging detection circuit and a second plugging detection circuit in an embodiment of a fast charging switching circuit based on dual-interface plugging detection according to the present invention.

FIG. 7 is a circuit schematic diagram of a first switch circuit in an embodiment of a fast charge switching circuit based on dual-interface plug-in detection according to the present invention.

FIG. 8 is a circuit schematic diagram of a current detection circuit in an embodiment of a fast charging switching circuit based on dual-interface plug-in detection according to the present invention.

FIG. 9 is a block diagram of a work flow of an embodiment of a fast charging switching method of a fast charging switching circuit based on dual-interface plugging and unplugging detection according to an embodiment of the present invention.

【Detailed ways】

In order to make the objectives, technical solutions and advantages of the invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not limited to the present invention.

An embodiment of a fast charging switching circuit based on dual-interface plugging detection:

Referring to FIG. 1 , a fast charging switching circuit based on dual-interface plug-in detection of the present invention includes a power supply terminal 100, a rectifier and transformer circuit 10, a control system 20, a USB Type-A interface 1, a USB Type-C interface 2, and a power supply. The terminal 100 inputs the power supply voltage to the rectifier and transformer circuit 10. A filter and degaussing circuit 30 is connected between the rectifier and transformer circuit 10 and the USB Type-A interface 1 and the USB Type-C interface 2. The USB Type-A interface 1 and the USB Type- A switch unit is connected to the C interface 2 , and the control system 20 is connected between the rectifier and transformer circuit 10 and the USB Type-A interface 1 and the USB Type-C interface 2 .

In this embodiment, the control system 20 includes a fast charging control unit 40 and a plug-in detection unit 50. The plug-in detection unit 50 detects the device plug-in signals of the USB Type-A interface 1 and the USB Type-C interface 2 respectively. The control unit 40 generates a switch control signal according to the detected device plug-in signal, and the fast charge control unit 40 sends a switch signal to the switch circuit according to the switch control signal to turn on/off the power terminal 100 to the USB Type-A interface 1, USB Type- The charging path of C interface 2. It can be seen that the control system 20 is mainly divided into fast charging control and plugging detection parts: the plugging detection part is different according to the actual chips. USB Type-A interface 1 can be divided into DCP insertion detection and external interrupt insertion detection, while USB Type-C interface 2 follows the Type-C connection and disconnection rules for insertion detection and judgment.

In this embodiment, the rectifier and transformer circuit 10 may be any conventional rectifier and transformer circuit, and the filter degaussing circuit 30 corresponds to any filter and degaussing circuit 30, or may be an integration of the filter circuit and the degaussing circuit. The input of the power supply terminal in this embodiment can be an adapter or a car charging source.

In this embodiment, the fast charging control unit 40 includes a first fast charging control circuit 41 and a second fast charging control circuit 42 , the plugging detection unit 50 includes a first plugging detection circuit and a second plugging detection circuit, and a switch unit Including a first switch circuit 61 and a second switch circuit 62, the first plug detection circuit detects the device plug signal of the USB Type-A interface 1, and the first fast charge control circuit 41 according to the detected USB Type-A interface 1. The device plug-in signal generates a first switch control signal, and the first fast charge control circuit 41 sends a switch signal to the first switch circuit 61 according to the first switch control signal to turn on/off the charging of the power supply terminal 100 to the USB Type-A interface 1 Path; the second plug detection circuit detects the device plug signal of the USB Type-C interface 2, and the second fast charge control circuit 42 generates a second switch control signal according to the detected device plug signal of the USB Type-C interface 2, The second fast charge control circuit 42 sends a switch signal to the second switch circuit 62 according to the second switch control signal to turn on/off the charging path from the power terminal 100 to the USB Type-C interface 2 .

Referring to FIG. 2, the first fast charging control circuit 41 includes a first fast charging protocol control circuit 411, a first MTK fast charging control unit 412, a first DCP protocol circuit 413, a first port control circuit 414, and a first fast charging protocol control circuit 414. The circuit 411 , the first MTK fast charge control unit 412 , and the enable end of the first DCP protocol circuit 413 are respectively electrically connected to the first plug detection circuit through the first port control circuit 414 . Specifically, the first DCP protocol circuit 413 is mainly for BC1.2 and APPLE; the first fast charging protocol control circuit 411 is mainly for QC2.0/QC3.0/AFC/FCP/SCP/SFCP etc. which use DP and DM for communication Fast charging; the first MTK fast charging control circuit 412 is mainly for the MTK protocol that uses current to communicate through VBUS.

Referring to FIG. 3 , the second fast charge control circuit 42 includes a second fast charge protocol control circuit 421 , a second MTK fast charge control unit 422 , a second DCP protocol circuit 423 , a second port control circuit 423 , and a PD control circuit 425 . The enabling terminals of the second fast charging protocol control circuit 421 , the second MTK fast charging control unit 422 , the second DCP protocol circuit 423 , and the PD control circuit 425 are respectively electrically connected to the second plugging detection circuit through the second port control circuit 423 . Specifically, the second DCP protocol circuit 423 is mainly for BC1.2 and APPLE; the second fast charging protocol control circuit 421 is mainly for QC2.0/QC3.0/AFC/FCP/SCP/SFCP etc. which use DP and DM for communication Fast charging; the second MTK fast charging control circuit 422 is mainly for the MTK protocol that uses current to communicate through VBUS; the PD control circuit 425 runs on the terminal and the charger, and uses the CC/ communication protocol, which is the PD protocol, including PD2.0 /3.0.

4 to 8, the switch unit further includes a current detection circuit, the ground terminal of the USB Type-A interface 1 is connected with a first sampling resistor R1, the ground terminal of the USB Type-C interface 2 is connected with a second sampling resistor R2, and the current The detection circuit detects the voltage difference signals of the first sampling resistor R1 and the second sampling resistor R2 respectively. In this embodiment, the current detection is performed by means of an operational amplifier, which can make the current detection more accurate. The current detection circuit is divided into a power supply Terminal 100 current detection circuit 204 and ground terminal pull current detection circuit 205 (using differential operation circuit).

The first plug detection circuit and the second plug detection circuit include a plug detection circuit 201 of the power supply terminal 100 and a plug detection circuit 202 of the ground terminal. 6 , the plug-in detection circuit 201 of the power terminal 100 includes a resistor R3 and a diode D1. One end of the resistor R3 is connected to the power terminal 100VCC, the other end of the resistor R3 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to VOUT; the ground terminal The plug-in detection circuit 202 includes a resistor R4, a resistor R5, and a MOS transistor Q1. The source of the MOS transistor Q1 is connected to one end of the resistor R5, and the two ends of the resistor R4 are connected between the drain of the MOS transistor Q1 and the other end of the resistor R5. .

Referring to FIG. 7 , the first switch circuit 61 and the second switch circuit 62 are both MOS transistor switch circuits, and the MOS transistor is used as a switch element, and also works in two states of off or on.

It can be seen that the present invention adopts the USB Type-A interface 1 to be normally open, and the USB Type-C interface 2 also maintains the normally open state when the CC connection is established; in the normal charging state, the switch ground circuits of the two interfaces can be kept in The normally open state is conducive to detecting the insertion of low-current devices and improves the versatility of applications; the two interfaces respectively support a variety of fast charging protocols, and have excellent protocol compatibility; when both interface MOS tube switch circuits are turned on , when one interface is lightly loaded, the other interface can still resume fast charging; circuit design costs can be saved, and the cost is lower; the range of detectable devices can be expanded; context switching is more efficient and time-saving, and can meet the needs of fast charging as much as possible.

Therefore, compared with the traditional solution, the present invention has a more sensitive detection device capability, and both interfaces are kept open as far as possible, so that low-current devices can be detected more accurately, and for some charging scenarios, it can be more effective and time-saving. Complete the state switch.

An embodiment of a fast charging switching method based on a fast charging switching circuit based on dual-interface unplugging detection:

A fast-charge switching method of a fast-charge switching circuit based on dual-interface plug-in detection is applied to the above-mentioned fast-charge switching circuit. The method includes, after it is determined that the system is in the power-on state, real-time detection of whether the loading state and charging mode of the two interfaces have changed, and if there is a change, judging whether the current state of the MOS transistor switch circuits of the two interfaces is in the open state, if If the MOS switch circuits of the two interfaces are both in the open state, it is judged whether the current state of the USB Type-A interface 1 is the overloaded state. Whether the current state of interface 2 is overloaded, if the current state of both interfaces is overloaded, turn off the fast charging enable, simulate USB plugging and unplugging of the two interfaces, and enter the normal charging state; if the USB Type- If the current state of port A is not overloaded, then judge whether the current state of the two interfaces is in the light-loaded state. If not, it can be determined that the USB Type-C interface 2 is in the overloaded state, and then judge whether to enable fast charging. If not, turn off the MOS tube switch circuit of USB Type-C interface 2, and control to turn on the fast charge enable, simulate USB plugging and unplugging of USB Type-C interface 2, and perform the on-off operation of its MOS tube switch circuit to prompt the USB Type-C interface 2 re-applies for fast charging, wherein, when USB Type-C interface 2 enters the fast charging state, USB Type-A interface 1 remains normally open.

In this embodiment, the change of the loaded state of the interface can be detected from the current threshold, and when the current threshold is greater than the current threshold, it is considered a transition from light load to heavy load. When it is less than the current threshold, it means the transition from heavy load to light load; the charging mode is the fast charging protocol triggered by the current charging port to determine which fast charging mode it is, or whether it is in the fast charging mode or the normal charging mode, that is Real-time monitoring of the loaded state of the dual ports and the triggered fast charge.

In this embodiment, light load refers to the load capacity range of the circuit, and it is judged as a light load when it is lower than a certain load threshold. This threshold can be changed according to the actual application, and can be judged by the percentage of the output power to the total power , below this value is light load; heavy load means above this threshold is judged as heavy load. In this application, light load/heavy load can also be judged according to the magnitude of the current drawn by the load device.

Further, after determining that the current state of the USB Type-A interface 1 is the overloaded state, determine whether the current state of the USB Type-C interface 2 is the overloaded state, and if the current state of the USB Type-C interface 2 is not the overloaded state, then determine whether the current state of the USB Type-C interface 2 is the overloaded state. Whether the current state of the two interfaces is a light-load state, if not, judge whether to enable the fast charge enable, if not, turn off the MOS switch circuit of the USB Type-A interface 1, and control to turn on the fast charge enable. Type-A interface 1 performs analog USB plugging and unplugging, and performs a switching operation on its MOS tube switch circuit to prompt USB Type-A interface 1 to re-apply for fast charging. When USB Type-A interface 1 enters the fast charging state, if the USB Type-A interface -C interface 2 does not establish a CC connection, then close USB Type-C interface 2.

Further, after it is determined that the USB Type-C interface 2 is in an overloaded state, if the fast charging enablement has been enabled, it is determined whether the USB Type-C interface 2 enters the fast charging state. If so, the USB Type-C interface 2 enters the fast charging state. Charging status; after confirming that the current status of USB Type-A interface 1 is overloaded, if fast charging has been enabled, then determine whether USB Type-A interface 1 enters fast charging, and if so, USB Type-A interface 1 enters Fast charge status.

Further, when judging whether the current state of the MOS tube switch circuits of the two interfaces is in an open state, if only the MOS tube switch circuit of a single USB Type-A interface 1 or USB Type-C interface 2 is in an open state, it is judged that a single USB Whether Type-A port 1 or USB Type-C port 2 is in a light load state, if so, open the closed port so that both ports are open.

Further, if both interfaces are in a light-load state, and both interfaces are in an open state, determine whether the USB Type-C interface 2 establishes a CC connection, and if not, close the USB Type-C interface 2; If it is determined that the USB Type-C interface 2 establishes the CC connection, the current state is maintained, that is, both interfaces are kept in the open state.

Specifically, Table 1 shows the dual-port status and fast-charging switch status corresponding to different situations:

Table 1

In practical application, referring to Figure 9, the method includes the following steps:

Step 1: After the system is powered on, it is in a resident state. In the resident state, the MOS transistor switch circuit of the USB Type-A interface 1 is turned on when it is powered on.

Step 2, determine whether the loading state and charging mode (normal charging/fast charging) of the two interfaces have changed, if there is a change, go to Step 3, otherwise go to Step 16.

Step 3: Judging the current state of the open state of the MOS tube switch circuits of the two interfaces, wherein the steps corresponding to the open state of the MOS tube switch circuits of the two interfaces are as follows: (1), a single USB Type-A interface 1 or USB The MOS transistor switch circuit of the Type-C interface 2 is in an on state, and step 12 is executed. (2) The MOS transistor switch circuits of the two interfaces are turned on, and step 4 is performed.

Step 4: Determine whether the current state of the USB Type-A interface 1 is overloaded. After determining that the current state of the USB Type-A interface 1 is the overloaded state, perform step 5; if it is determined that the current state of the USB Type-A interface 1 is not overloaded status, go to step 7.

Step 5, determine whether the current state of the USB Type-C interface 2 is the overload state, if the current state of the USB Type-C interface 2 is not the overload state, go to step 7; after determining that the current state of the USB Type-A interface 1 is the overload state After that, go to step 6.

Step 6 , if the current state of the two interfaces is in the heavy load state, turn off the fast charging enable, perform an analog plug-in switch NMOS on the two interfaces, and enter the dual-port normal charging state, and then go to step 16 .

Step 7, determine whether the current state of the two interfaces is a light load state, if yes, go to Step 14, otherwise, go to Step 8.

Wherein, in step 7, if it is determined that the current states of the two interfaces are not in the light-load state, it may be determined that one of the USB Type-A interface 1 or the USB Type-C interface 2 is in the heavy-load state.

Step 8, determine whether to enable fast charging, if not, go to Step 9, if yes, go to Step 10.

Step 9: Turn off the MOS tube switch circuit of the USB Type-A interface 1, and control to turn on the fast charging enable, simulate USB plugging and unplugging of the USB Type-A interface 1 of the heavy load port, and perform the on-off of the MOS tube switch circuit. Operate to prompt the USB Type-A port 1 to re-apply for fast charging, and then go to step 16. Wherein, when the USB Type-A interface 1 enters the fast charging state, if the USB Type-C interface 2 does not establish a CC connection, the USB Type-C interface 2 is closed.

In step 10, it is judged whether the reload port has entered into fast charge, and into fast charge, step 11 is executed; otherwise, step 16 is skipped.

Wherein, in step 10, after it is determined that the USB Type-C interface 2 is in an overloaded state, if the fast charging enablement has been turned on, it is determined whether the USB Type-C interface 2 enters the fast charging state, and if so, the USB Type-C Interface 2 enters the fast charging state; after determining that the current state of USB Type-A interface 1 is overloaded, if the fast charging enablement has been enabled, it is judged whether the USB Type-A interface 1 enters the fast charging state. -A port 1 enters the fast charging state.

Step 11, enter the fast charging state at the heavy load port, close the light load port, and then go to step 16.

Step 12, if only the MOS switch circuit of a single USB Type-A interface 1 or USB Type-C interface 2 is in the open state, then judge whether the interface is in a light load state, if it is in a light load state, skip to step 13, otherwise Go to step 16.

Step 13 , when a single interface is open and the interface is under light load, the closed interface is opened so that both interfaces are in an open state, and then step 16 is skipped. Among them, if you want to open the USB Type-C interface 2, it must be in the state where the CC is connected. If the CC is not connected, go directly to step 16.

Step 14: If both interfaces are in a light-load state and both interfaces are in an open state, determine whether the USB Type-C interface 2 establishes a CC connection. For example, it is determined that the USB Type-C interface 2 establishes a CC connection. Then keep the current state, otherwise jump to step 15.

Step 15, close the USB Type-C interface 2. Go to step 16.

Step 16, resident state, after any branch, jump to this state at the end, and then jump to step 1, and continue to detect the loaded state and the charging mode in this state.

It can be seen that the method of the present invention increases the normally open function of the corresponding port, and can more accurately judge the plugging and unplugging of various devices in different scenarios; the open and close conditions of the MOS switch circuit enable the device to switch between normal charging and fast charging. More flexible; any single port of the AC supports a variety of fast charging protocols, and the dual-port plug-in is automatically recognized and reduced to 5V charging when it is overloaded, which can limit the power to ensure safety; when one interface enters a light load, the interface under heavy load can be used. To restore fast charging, keep the two interface MOS switch circuits normally open under conditions to ensure that devices with different characteristics can be identified and inserted.

Therefore, compared with the traditional solution, the present invention has a more sensitive detection device capability, and both interfaces are kept open as far as possible, so that low-current devices can be detected more accurately, and for some charging scenarios, it can be more effective and time-saving. Complete the state switch. Mainly have the following characteristics:

1. The USB Type-A interface is set to be normally open, and it will open immediately after power-on, and the only situation when it is closed is that the USB Type-C interface enters fast charging.

2. The shutdown scenarios of the USB Type-C interface are: (1) CC is not connected; (2) The USB Type-A interface applies for fast charging; in other scenarios, the USB Type-C interface remains normally open.

3. The software controls the analog plugging and unplugging, which saves time and is more efficient without manual physical plugging and unplugging.

4. Any single port supports a variety of fast charging. When dual-port charging, it will automatically drop to 5V; when one of the ports becomes light-loaded, the heavy-load port is simulated plugging and unplugging, and the heavy-load port can automatically resume fast charging.

5. The single-channel transformer can be branched after the control system 20, which saves costs, and the hardware circuit is simpler. It can be independently controlled by an external double switch, and the control is more flexible.

6. The light and heavy load detection judgment conditions cover a wide range, which can effectively detect equipment with different electrical characteristics. It can be limited in terms of current value, fast charging high voltage, DCP and CC connection status, and fast charging mode.

It should be noted that the above are only the preferred embodiments of the present invention, but the design concept of the invention is not limited thereto, and any non-substantial modification made to the present invention by using this concept also falls within the protection scope of the present invention. Inside.

Claims (10)

1. The utility model provides a fast switching circuit that charges based on two interfaces are pulled out and are inserted detection, includes, its characterized in that:

the power supply comprises a power supply end, a rectification transformation circuit, a control system, a USB Type-A interface and a USB Type-C interface, wherein the power supply end inputs power supply voltage to the rectification transformation circuit, a filtering degaussing circuit is connected between the rectification transformation circuit and the USB Type-A interface and between the rectification transformation circuit and the USB Type-C interface, switch units are connected at the USB Type-A interface and the USB Type-C interface, and the control system is connected between the rectification transformation circuit and the USB Type-A interface and between the rectification transformation circuit and the USB Type-C interface;

the control system comprises a quick charging control unit and a plug detection unit, wherein the plug detection unit respectively detects equipment plug signals of the USB Type-A interface and the USB Type-C interface, the quick charging control unit generates a switch control signal according to the detected equipment plug signals, and the quick charging control unit sends a switch signal to the switch circuit according to the switch control signal to switch on/off a charging path from the power supply end to the USB Type-A interface and the USB Type-C interface.

2. The fast charge switching circuit according to claim 1, wherein:

the quick charging control unit comprises a first quick charging control circuit and a second quick charging control circuit, the plug detection unit comprises a first plug detection circuit and a second plug detection circuit, the switch unit comprises a first switch circuit and a second switch circuit, the first plug detection circuit detects an equipment plug signal of the USB Type-A interface, the first quick charging control circuit generates a first switch control signal according to the detected equipment plug signal of the USB Type-A interface, and the first quick charging control circuit sends a switch signal to the first switch circuit according to the first switch control signal so as to switch on/off a charging path from the power supply end to the USB Type-A interface;

the second plug detection circuit detects an equipment plug signal of the USB Type-C interface, the second quick-charging control circuit generates a second switch control signal according to the detected equipment plug signal of the USB Type-C interface, and the second quick-charging control circuit sends a switch signal to the second switch circuit according to the second switch control signal to switch on/off a charging path from the power supply end to the USB Type-C interface.

3. The fast charge switching circuit according to claim 2, wherein:

the first switch circuit and the second switch circuit are both MOS tube switch circuits.

4. A fast charge switching circuit according to claim 2 or 3, wherein:

the first fast charging control circuit comprises a first fast charging protocol control circuit, a first MTK fast charging control unit, a first DCP protocol circuit and a first port control circuit, and enabling ends of the first fast charging protocol control circuit, the first MTK fast charging control unit and the first DCP protocol circuit are respectively electrically connected with the first plugging detection circuit through the first port control circuit.

5. A fast charge switching circuit according to claim 2 or 3, wherein:

the second quick-charging control circuit comprises a second quick-charging protocol control circuit, a second MTK quick-charging control unit, a second DCP protocol circuit, a second port control circuit and a PD control circuit, and enabling ends of the second quick-charging protocol control circuit, the second MTK quick-charging control unit, the second DCP protocol circuit and the PD control circuit are respectively and electrically connected with the second plugging detection circuit through the second port control circuit.

6. A fast charging switching method of a fast charging switching circuit based on dual-interface plug-in detection, which is applied to the fast charging switching circuit based on dual-interface plug-in detection according to any one of claims 1 to 5, and the method includes:

after the system is determined to be in a power-on state, detecting whether the loading state and the charging mode of the two interfaces are changed in real time, if so, judging whether the current states of the MOS tube switch circuits of the two interfaces are in an open state, if both the MOS tube switch circuits of the two interfaces are in the open state, judging whether the current state of the USB Type-A interface is a heavy load state, judging whether the current state of the USB Type-C interface is the heavy load state after determining that the current state of the USB Type-A interface is the heavy load state, and if the current states of the two interfaces are the heavy load state, closing the quick charging enable, performing simulation USB plugging and unplugging on the two interfaces, and entering a common charging state;

if it is determined that the current state of the USB Type-A interface is not a heavy load state, judging whether the current states of the two interfaces are light load states, if not, determining that the USB Type-C interface is a heavy load state, judging whether to open the quick charging enable, if not, closing an MOS (metal oxide semiconductor) tube switching circuit of the USB Type-C interface, controlling to open the quick charging enable, performing simulated USB plug-pull on the USB Type-C interface, and executing switch-on and switch-off operation on the MOS tube switching circuit to enable the USB Type-C interface to reapply for quick charging, wherein when the USB Type-C interface enters the quick charging state, the USB Type-A interface is kept in a normally open state.

7. The fast charge switching method according to claim 6, characterized in that:

after the current state of the USB Type-A interface is determined to be a heavy load state, whether the current state of the USB Type-C interface is the heavy load state or not is judged, if the current state of the USB Type-C interface is not the heavy load state, whether the current states of the two interfaces are light load states or not is judged, if not, whether the current states of the two interfaces are light load states or not is judged, and if not, the MOS tube switching circuit of the USB Type-A interface is closed, the USB Type-A interface is controlled to be opened and the fast charge enable is controlled to be started, USB plugging and unplugging are simulated for the USB Type-A interface, the MOS tube switching circuit is switched on and switched off to enable the USB Type-A interface to reapply for fast charge, and when the USB Type-A interface enters the fast charge state, if the USB.

8. The fast charge switching method according to claim 7, characterized in that:

after the USB Type-C interface is determined to be in a heavy load state, if the quick charging enable is started, whether the USB Type-C interface enters the quick charging state or not is judged, and if the USB Type-C interface enters the quick charging state, the USB Type-C interface enters the quick charging state;

after the current state of the USB Type-A interface is determined to be the heavy load state, if the quick charge enabling is started, whether the USBType-A interface enters the quick charge state or not is judged, and if the USBType-A interface enters the quick charge state, the USB Type-A interface enters the quick charge state.

9. The fast charge switching method according to claim 7, characterized in that:

when judging whether the current states of the MOS tube switch circuits of the two interfaces are in the opening state, if the MOS tube switch circuit of only a single USBType-A interface or a single USB Type-C interface is in the opening state, judging whether the single USB Type-A interface or the single USB Type-C interface is in the light load state, if so, opening the closed interface, and enabling the two interfaces to be in the opening state.

10. The fast charge switching method according to claim 7, characterized in that:

if the two interfaces are in a light load state and are in an open state, judging whether the USB Type-C interface establishes CC connection or not, if not, closing the USB Type-C interface; and if the USB Type-C interface is determined to establish the CC connection, keeping the current state, namely keeping the two interfaces in the opening state.

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