A control method for a fast charging charger

Abstract

The present application discloses a control method for a fast-charge charger, which is applied to a fast-charge chip, and the method includes: the fast-charge chip detects the state of the AC-DC conversion circuit of the fast-charge charger, and detects the state of the discharge output universal serial bus USB interface of the fast-charge charger; the fast-charge chip confirms the fast-charge protocol switch state of the connected power-consuming device; and controls the fast-charge charger to enter a target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, the fast-charge protocol switch state of the connected power-consuming device, and a preset control strategy. The practicality of the fast-charge charger can be improved by using the embodiments of the present application.

Description

Technical Field

[0001] The present application relates to the field of fast charging technology, and in particular to a control method for a fast charging charger. Background Art

[0002] At present, mobile power devices are equipped with rechargeable batteries, which can not only charge the internal batteries to store energy, but also charge other devices (such as mobile phones, etc.) through the batteries. However, the discharge output end of the mobile power device can only output 5V voltage to the outside, and cannot support faster charging and discharging at higher voltages. Summary of the invention

[0003] The present application provides a fast charging charger, a fast charging chip and a control method of the fast charging charger.

[0004] In a first aspect, the present application provides a fast charging charger, including an AC-DC conversion circuit, a rechargeable battery, a discharge output USB interface, a fast charging chip, a DC-DC buck-boost circuit, an input switch, and an output switch;

[0005] The AC-DC conversion circuit is connected to the input end of the input switch and the fast charging chip; the output end of the input switch is connected to the input end of the output switch and the DC-DC buck-boost circuit; the control end of the input switch and the control end of the output switch are connected to the fast charging chip; the output end of the output switch is connected to the discharge output USB interface; the DC-DC buck-boost circuit is also connected to the fast charging chip and the rechargeable battery; the discharge output USB interface is also connected to the fast charging chip;

[0006] The AC-DC conversion circuit is used to convert the connected alternating current into direct current, and under the control of the fast charging chip, output the direct current to the DC-DC buck-boost circuit or the power-consuming device connected to the discharge output USB interface;

[0007] The DC-DC buck-boost circuit is used to, under the control of the fast charging chip, convert the DC voltage output by the AC-DC conversion circuit into a battery voltage to charge the rechargeable battery, or convert the battery voltage output by the rechargeable battery into a DC voltage to power the electrical device;

[0008] The fast charging chip is used to detect whether the AC-DC conversion circuit is connected to an AC voltage; and to detect whether the electrical device is connected to the discharge output USB interface; and to confirm whether the connected electrical device has enabled the fast charging protocol; and to control the fast charging charger to enter a target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset control strategy. The target state includes one of the following: standby state, slow charging state, fast charging state, slow discharging state, fast discharging state, slow charging and slow discharging state, and fast charging and discharging state.

[0009] In one implementation, the fast charging chip includes a control state machine burned with the preset control strategy, and a load detection module, a protocol identification module, an AC-DC detection control module, a DC-DC buck-boost detection control module, an input switch control module, and an output switch control module independently connected to the control state machine;

[0010] The load detection module and the protocol identification module are connected to the discharge output USB interface; the AC-DC detection control module is connected to the AC-DC conversion circuit; the DC-DC buck-boost detection control module is connected to the DC-DC buck-boost circuit; the input switch control module is connected to the input switch; the output switch control module is connected to the output switch;

[0011] The load detection module is used to detect whether an electric device is plugged into or unplugged from the discharge output USB interface, and input a detected load detection signal into the control state machine;

[0012] The protocol identification module is used to identify whether the power-consuming device connected to the discharge output USB interface has a fast charging protocol, and input the identified charging protocol identification signal into the control state machine;

[0013] The AC-DC detection control module is used to detect whether the AC-DC conversion circuit has an AC power supply connected, and input a detected power supply connection signal into the control state machine;

[0014] The control state machine is used to control the fast charging charger to enter a target state according to the load detection signal, the charging protocol identification signal, the power connection signal, and the preset control strategy.

[0015] In one implementation, the preset control strategy includes:

[0016] If the AC-DC conversion circuit is not connected to an AC power source, and the discharge output USB interface is not connected to an electrical device, the fast charging charger is controlled to enter a standby state;

[0017] If in the standby state, the AC-DC conversion circuit is connected to an AC power supply, the fast charging charger is controlled to enter a slow charging state. In the slow charging state, the control state machine controls the AC-DC conversion circuit to output a default DC voltage through the AC-DC detection control module, and the control state machine controls the DC-DC buck-boost circuit to perform normal charging for the rechargeable battery through the DC-DC buck-boost detection control module;

[0018] If in the slow charging state, and the discharge output USB interface is not connected to an electrical device, the fast charging charger is controlled to enter the fast charging state. In the fast charging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine controls the DC-DC buck-boost circuit to fast charge the rechargeable battery through the DC-DC buck-boost detection control module;

[0019] If in the standby state, and the device is turned on by a button or the discharge output USB interface is connected to an electric device, the fast charge charger is controlled to enter a slow discharge state. In the slow discharge state, the control state machine controls the DC-DC buck-boost circuit to boost the rechargeable battery to the default DC voltage through the DC-DC buck-boost detection control module to perform normal charging for the electric device;

[0020] If in the slow-discharge state, the electric device has a fast-charge protocol and the fast-charge protocol handshake is successful, the fast-charge charger is controlled to enter the fast-discharge state. In the fast-discharge state, the control state machine controls the DC-DC buck-boost circuit through the DC-DC buck-boost detection control module to fast-charge the electric device.

[0021] If in the slow charging state, and the discharge output USB interface is connected to an electric device, the fast charging charger is controlled to enter a slow charging and slow discharging state. In the slow charging and slow discharging state, the control state machine controls the AC-DC conversion circuit to output the default DC voltage through the AC-DC detection control module, and the control state machine turns on the output switch through the output switch control module to perform normal charging for the electric device.

[0022] If in the fast charging state, and the discharge output USB interface is connected to an electrical device, the fast charging charger is controlled to enter the slow charging and slow discharging state;

[0023] If in the slow charging and discharging state, and the electrical device has a fast charging protocol and the fast charging protocol handshake is successful, the fast charging charger is controlled to enter a fast charging and discharging state. In the fast charging and discharging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine turns on the input switch through the input switch control module to fast charge the electrical device;

[0024] If the AC-DC conversion circuit is connected to an AC power source in the fast-discharging state, the fast-charging charger is controlled to enter the fast-charging and discharging state.

[0025] In one implementation, the DC-DC buck-boost circuit includes a first MOS transistor, a second MOS transistor, a first resistor and a first inductor;

[0026] The source of the first MOS transistor is connected to the output end of the input switch, the gate of the first MOS transistor is connected to the DC-DC buck-boost detection control module, the drain of the first MOS transistor is connected to one end of the first inductor, and the other end of the first inductor is connected to the rechargeable battery;

[0027] Two ends of the first resistor are connected in parallel between the source and the gate of the first MOS tube;

[0028] The source of the second MOS tube is grounded, the drain of the second MOS tube is connected to the inductance measurement end, and the gate of the second MOS tube is connected to the fast charging chip.

[0029] In one implementation, the input switch includes a second resistor and a third MOS transistor and a fourth MOS transistor connected in series;

[0030] The drain of the third MOS tube is connected to the AC-DC conversion circuit, the gate of the third MOS tube is connected to the input switch control module, and the source of the third MOS tube is connected to the source of the fourth MOS tube; the gate of the fourth MOS tube is connected to the input switch control module, and the drain of the fourth MOS tube is connected to the input end of the output switch; the second resistor is connected in parallel between the source and the gate of the third MOS tube;

[0031] The output switch includes a fifth MOS tube and a third resistor;

[0032] The source of the fifth MOS tube is connected to the drain of the fourth MOS tube, the drain of the fifth MOS tube is connected to the discharge output USB interface, and the gate of the fifth MOS tube is connected to the output switch control module; the third resistor is connected in parallel between the source and the gate of the fifth MOS tube.

[0033] In a second aspect, an embodiment of the present application provides a fast charging chip, which is applied to the fast charging charger described in the first aspect, wherein:

[0034] The fast charging chip is used to detect whether the AC-DC conversion circuit of the fast charging charger is connected to an AC voltage; and to detect whether the electrical device is connected to the discharge output USB interface of the fast charging charger; and to confirm whether the connected electrical device has enabled the fast charging protocol; and, according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset control strategy, the fast charging charger is controlled to enter a target state, and the target state includes one of the following: standby state, slow charging state, fast charging state, slow discharging state, fast discharging state, slow charging and slow discharging state, and fast charging and discharging state.

[0035] In a third aspect, an embodiment of the present application provides a control method for a fast charging charger, which is applied to the fast charging chip described in the second aspect, and the method includes:

[0036] Detecting the state of the AC-DC conversion circuit of the fast charging charger, and detecting the state of the discharge output universal serial bus USB interface of the fast charging charger;

[0037] The fast charging charger is controlled to enter a target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset control strategy. The target state includes one of the following: standby state, slow charging state, fast charging state, slow discharge state, fast discharge state, slow charging and slow discharge state, and fast charging and discharging state.

[0038] In one implementation, the fast charging voltage output by the AC-DC conversion circuit is a fast charging voltage applied for by the electrical device, and the method further includes:

[0039] If the fast charging voltage requested by the electrical device changes, the output voltage of the AC-DC conversion circuit is adjusted to the fast charging voltage requested by the electrical device through the AC-DC detection control module, and the DC-DC buck-boost detection control module controls the output voltage of the DC-DC buck-boost circuit within a preset range, and the preset range is determined based on the output voltage of the AC-DC conversion circuit.

[0040] It can be seen that in the embodiment of the present application, the fast charging chip controls the fast charging charger to enter the target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and the preset control strategy, thereby realizing the control of the fast charging charger based on actual conditions and improving the practicality of the charger. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1is a structural diagram of a fast charging charger provided in an embodiment of the present application;

[0042] Figure 2 This is a structural diagram of a fast charging chip provided in an embodiment of the present application;

[0043] Figure 3 is a structural diagram of a DC-DC buck-boost circuit provided in an embodiment of the present application;

[0044] Figure 4 is a circuit diagram of an input switch and an output switch provided in an embodiment of the present application;

[0045] Figure 5 It is a flow chart of a control method of a fast charging charger provided in an embodiment of the present application.

[0046] Reference numerals include:

[0047] AC-DC conversion circuit 1; rechargeable battery 2; discharge output USB interface 3; control chip 4; DC-DC step-up and step-down circuit 5; input switch 6; output switch 7;

[0048] A first MOS tube P1; a second MOS tube N1;

[0049] A first resistor R1 to a third resistor R3; a first inductor L1;

[0050] The third MOS tube P2 to the fifth MOS tube P4. DETAILED DESCRIPTION

[0051] The following is a detailed explanation of the implementation mode of the present application in conjunction with the accompanying drawings. The embodiments are provided only for illustrative purposes and should not be construed as limitations on the present application. The accompanying drawings are provided for reference and illustration only and do not constitute limitations on the scope of patent protection of the present application, because many changes can be made to the present application without departing from the spirit and scope of the present application.

[0052] See also Figure 1 , Figure 1 1 is a schematic diagram of a fast charging charger provided in an embodiment of the present application, the fast charging charger includes an alternating current (AC)-direct current (DC) conversion circuit 1, a rechargeable battery 2, a discharge output universal serial bus (USB) interface 3, a fast charging chip 4, a DC-DC buck-boost circuit 5, an input switch 6 and an output switch 7;

[0053] The AC-DC conversion circuit 1 is connected to the input end of the input switch 6 and the fast charging chip 4; the output end of the input switch 6 is connected to the input end of the output switch 7 and the DC-DC buck-boost circuit 5; the control end of the input switch 6 and the control end of the output switch 7 are connected to the fast charging chip 4; the output end of the output switch 7 is connected to the discharge output USB interface 3; the DC-DC buck-boost circuit 5 is also connected to the fast charging chip 4 and the rechargeable battery 2; the discharge output USB interface 3 is also connected to the fast charging chip 4;

[0054] The AC-DC conversion circuit 1 is used to convert the connected alternating current into direct current, and under the control of the fast charging chip 4, output the direct current to the DC-DC buck-boost circuit 5 or the power-consuming device connected to the discharge output USB interface 3;

[0055] The DC-DC step-up / down circuit 5 is used to, under the control of the fast charging chip 4, convert the DC voltage output by the AC-DC conversion circuit 1 into a battery voltage to charge the rechargeable battery 2, or convert the battery voltage output by the rechargeable battery 2 into a DC voltage to power the electrical device;

[0056] The fast charging chip 4 is used to detect whether the AC-DC conversion circuit 1 is connected to an AC voltage; and to detect whether the electrical device is connected to the discharge output USB interface 3; and to confirm whether the connected electrical device has enabled the fast charging protocol; and, according to the state of the AC-DC conversion circuit 1, the state of the discharge output USB interface 3, and a preset control strategy, the fast charging charger is controlled to enter a target state, and the target state includes one of the following: standby state, slow charging state, fast charging state, slow discharging state, fast discharging state, slow charging and slow discharging state, and fast charging and discharging state.

[0057] In this embodiment, when the AC-DC conversion circuit is connected to alternating current and the input energy is greater than the output energy, the rechargeable battery 2 will store energy; when the AC-DC conversion circuit is not connected to alternating current, or the input energy is less than the output required energy, the rechargeable battery 2 will release the stored energy to the electrical device to power the electrical device.

[0058] It can be seen that in the embodiment of the present application, the fast charging chip controls the fast charging charger to enter the target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and the preset control strategy, thereby realizing the control of the fast charging charger based on actual conditions and improving the practicality of the charger.

[0059] In one implementation of this application, see Figure 2The fast charging chip 4 includes a control state machine 41 with the preset control strategy burned in it, and a load detection module 42, a protocol identification module 43, an AC-DC detection control module 44, a DC-DC buck-boost detection control module 45, an input switch control module 46 and an output switch control module 47 independently connected to the control state machine 41;

[0060] The load detection module 42 and the protocol identification module 43 are connected to the discharge output USB interface 3; the AC-DC detection control module 44 is connected to the AC-DC conversion circuit 1; the DC-DC buck-boost detection control module 45 is connected to the DC-DC buck-boost circuit 5; the input switch control module 46 is connected to the input switch 6; the output switch control module 47 is connected to the output switch 7;

[0061] The load detection module 42 is used to detect whether an electric device is plugged in or unplugged from the discharge output USB interface 3, and input the detected load detection signal to the control state machine 41;

[0062] The protocol identification module 43 is used to identify whether the power-consuming device connected to the discharge output USB interface 3 has a fast charging protocol, and input the identified charging protocol identification signal to the control state machine 41;

[0063] The AC-DC detection control module 44 is used to detect whether the AC-DC conversion circuit 1 has an AC power supply connected, and input a detected power supply connection signal to the control state machine 41;

[0064] The control state machine 41 is used to control the fast charging charger to enter a target state according to the load detection signal, the charging protocol identification signal, the power connection signal, and the preset control strategy.

[0065] In the present application, if the AC-DC detection control module 44 detects that the AC-DC conversion circuit 1 outputs direct current, it determines that an AC voltage is connected to the AC-DC conversion circuit 1. Otherwise, it determines that no AC voltage is connected to the AC-DC conversion circuit 1, and at the same time feeds back the power connection signal to the control state machine.

[0066] The control state machine 41 may also be implemented by a main program of a microcontroller unit (MCU).

[0067] It can be seen that in the embodiment of the present application, the fast charging chip includes multiple modules, and different modules are respectively connected to different components, so that the fast charging chip can be controlled more reasonably and the performance of the fast charging charger can be improved.

[0068] In one implementation of the present application, the preset control strategy includes:

[0069] If the AC-DC conversion circuit is not connected to an AC power source, and the discharge output USB interface is not connected to an electrical device, the fast charging charger is controlled to enter a standby state;

[0070] If in the standby state, the AC-DC conversion circuit is connected to an AC power supply, the fast charging charger is controlled to enter a slow charging state. In the slow charging state, the control state machine controls the AC-DC conversion circuit to output a default DC voltage through the AC-DC detection control module, and the control state machine controls the DC-DC buck-boost circuit to perform normal charging for the rechargeable battery through the DC-DC buck-boost detection control module;

[0071] If in the slow charging state, and the discharge output USB interface is not connected to an electrical device, the fast charging charger is controlled to enter the fast charging state. In the fast charging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine controls the DC-DC buck-boost circuit to fast charge the rechargeable battery through the DC-DC buck-boost detection control module;

[0072] If in the standby state, and the device is turned on by a button or the discharge output USB interface is connected to an electric device, the fast charge charger is controlled to enter a slow discharge state. In the slow discharge state, the control state machine controls the DC-DC buck-boost circuit to boost the rechargeable battery to the default DC voltage through the DC-DC buck-boost detection control module to perform normal charging for the electric device;

[0073] If in the slow-discharge state, the electric device has a fast-charge protocol and the fast-charge protocol handshake is successful, the fast-charge charger is controlled to enter the fast-discharge state. In the fast-discharge state, the control state machine controls the DC-DC buck-boost circuit through the DC-DC buck-boost detection control module to fast-charge the electric device.

[0074] If in the slow charging state, and the discharge output USB interface is connected to an electric device, the fast charging charger is controlled to enter a slow charging and slow discharging state. In the slow charging and slow discharging state, the control state machine controls the AC-DC conversion circuit to output the default DC voltage through the AC-DC detection control module, and the control state machine turns on the output switch through the output switch control module to perform normal charging for the electric device.

[0075] If in the fast charging state, and the discharge output USB interface is connected to an electrical device, the fast charging charger is controlled to enter the slow charging and slow discharging state;

[0076] If in the slow charging and discharging state, and the electrical device has a fast charging protocol and the fast charging protocol handshake is successful, the fast charging charger is controlled to enter a fast charging and discharging state. In the fast charging and discharging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine turns on the input switch through the input switch control module to fast charge the electrical device;

[0077] If the AC-DC conversion circuit is connected to an AC power source in the fast-discharging state, the fast-charging charger is controlled to enter the fast-charging and discharging state.

[0078] Optionally, the fast charging voltage output by the AC-DC conversion circuit is the fast charging voltage requested by the electrical device; or, the fast charging voltage output by the AC-DC conversion circuit is pre-set by the fast charging charger.

[0079] Optionally, the fast charging chip is also used to adjust the output voltage of the AC-DC conversion circuit to the fast charging voltage currently applied for by the electrical device through the AC-DC detection control module if the fast charging voltage applied for by the electrical device changes, and to control the output voltage of the DC-DC buck-boost circuit within a preset range through the DC-DC buck-boost detection control module, wherein the preset range is determined based on the output voltage of the AC-DC conversion circuit.

[0080] The preset range is:

[0081]

[0082] The V 1 is the output voltage of the AC-DC conversion circuit, V 2i is the fast charging voltage applied for by the power-consuming device for the i-th time, and n is the number of times the user device applies for the fast charging voltage.

[0083] Optionally, the preset control strategy also includes:

[0084] If it is detected that the AC power source is unplugged in the slow charging state, the fast charging charger is controlled to enter the standby state;

[0085] If it is detected that the rechargeable battery is fully charged in the fast charging state, the fast charging charger is controlled to enter the slow charging state;

[0086] If it is detected that the AC power source is unplugged in the slow charging and discharging state, the fast charging charger is controlled to enter the slow discharging state;

[0087] If in the fast-discharge state, it is detected that the electric device applies to exit fast charging, the fast-charge charger is controlled to enter the slow-discharge state;

[0088] If in the slow playback state, it is detected that the electric device is fully charged or unplugged, or it is detected that the fast charging charger is forcibly shut down by pressing a button, the fast charging charger is controlled to enter the standby state;

[0089] If it is detected that the AC power source is unplugged in the fast charging and discharging state, the fast charging charger is controlled to enter the fast discharging state;

[0090] In the fast-discharge state, if it is detected that the electric device is fully charged or unplugged, or if it is detected that the fast-charge charger is forcibly shut down by pressing a button, the fast-charge charger is controlled to enter a standby state;

[0091] In the fast charging and discharging state, if it is detected that the power-consuming device applies to exit the fast charging, the fast charging charger is controlled to enter the slow charging and discharging state;

[0092] In the slow charging and discharging state, if it is detected that the electrical device is fully charged or unplugged, the fast charging charger is controlled to enter the slow charging state.

[0093] It can be seen that in the embodiment of the present application, when there is no AC power supply and no power-consuming device connected, the fast charging charger enters a standby state to reduce power consumption. In the standby state, if the AC power supply is connected, the fast charging charger enters a slow charging state to charge the rechargeable battery normally so that the fast charging charger can store energy slowly. In the slow charging state, if there is no power-consuming device connected, the fast charging charger enters a fast charging state to charge the rechargeable battery quickly so that the fast charging charger can store energy quickly. In the standby state, if the power is turned on by a button or a power-consuming device is connected, the fast charging charger enters a slow release state to charge the power-consuming device normally to prevent the output high voltage from damaging the power-consuming device that does not support high-voltage fast charging. In the slow release state, if the power-consuming device has a fast charging protocol and the fast charging protocol handshake is successful, the fast charging charger enters a fast release state to charge the power-consuming device quickly to achieve the purpose of fast charging the power-consuming device. In the slow charging state, if a power-consuming device is connected, the fast charging charger enters a slow charging and slow release state to achieve the effect of charging and releasing at the same time. In the fast charging state, if there is an electrical device connected, the fast charging charger will enter the slow charging and discharging state to prevent the output high voltage from damaging the electrical device that does not support high-voltage fast charging. In the slow charging and discharging state, if the electrical device has a fast charging protocol and the handshake is successful, the fast charging charger will enter the fast charging and discharging state to achieve the effect of fast charging and discharging. In the fast discharging state, if AC power is connected, the fast charging charger will enter the fast charging and discharging state to achieve the effect of fast charging and discharging.

[0094] In one implementation of this application, see Figure 3 , the DC-DC buck-boost circuit 5 includes a first metal oxide semiconductor (MOS) tube P1, a second MOS tube N1, a first resistor R1 and a first inductor L1;

[0095] The source S of the first MOS transistor P1 is connected to the output end of the input switch 6, the gate G of the first MOS transistor P1 is connected to the DC-DC step-up / step-down detection control module 45, the drain D of the first MOS transistor P1 is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the rechargeable battery 2; the two ends of the first resistor R1 are connected in parallel between the source S and the gate G of the first MOS transistor P1;

[0096] The source S of the second MOS tube N1 is grounded, the drain D of the second MOS tube N1 is connected to the inductance measurement terminal LX, and the gate G of the second MOS tube N1 is connected to the fast charging chip 4.

[0097] The first MOS transistor P1 is a P-channel enhancement mode MOS transistor; the second MOS transistor N1 is an N-channel enhancement mode MOS transistor.

[0098] In one implementation of this application, see Figure 4 , the input switch 6 includes a second resistor R2 and a third MOS transistor P2 and a fourth MOS transistor P3 connected in series;

[0099] The drain D of the third MOS transistor P2 is connected to the AC-DC conversion circuit 1, the gate G of the third MOS transistor P2 is connected to the input switch control module, the source S of the third MOS transistor P2 is connected to the source S of the fourth MOS transistor P3; the gate G of the fourth MOS transistor P3 is connected to the input switch control module, and the drain D of the fourth MOS transistor P3 is connected to the input end of the output switch 7; the second resistor R2 is connected in parallel between the source S and the gate G of the third MOS transistor P2;

[0100] The output switch 7 includes a fifth MOS tube P4 and a third resistor R3;

[0101] The source S of the fifth MOS tube P4 is connected to the drain D of the fourth MOS tube P3, the drain D of the fifth MOS tube P4 is connected to the discharge output USB interface 3, and the gate G of the fifth MOS tube P4 is connected to the output switch control module; the third resistor R3 is connected in parallel between the source S and the gate G of the fifth MOS tube P4.

[0102] The third MOS transistor P2, the fourth MOS transistor P3 and the fifth MOS transistor P4 are all P-channel enhancement type MOS transistors.

[0103] In one implementation of the present application, the AC-DC conversion circuit 1 includes an AC-DC controller;

[0104] The AC-DC controller is connected to the AC-DC detection control module 44 .

[0105] Among them, the default DC voltage is 5V, and the fast charging voltage range is 5~20V.

[0106] In the embodiment of the present application, when AC voltage is connected, the AC-DC detection control module adjusts the output voltage of the AC-DC conversion circuit 1 according to a preset control strategy, so that it outputs a fast charging voltage according to the requirements of the actual connected electrical equipment, thereby achieving fast charging output while charging and discharging, while increasing the charging power, shortening the charging time, and improving the charging efficiency.

[0107] See also Figure 5 , Figure 5 : is a flow chart of a control method of a fast charging charger provided in an embodiment of the present application, the method is applied to the above-mentioned fast charging chip, and comprises the following steps:

[0108] Step 501: Detecting the state of the AC-DC conversion circuit of the fast charging charger, and detecting the state of the discharge output universal serial bus USB interface of the fast charging charger;

[0109] Step 502: Control the fast charging charger to enter a target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and a preset control strategy, wherein the target state includes one of the following: standby state, slow charging state, fast charging state, slow discharge state, fast discharge state, slow charging and slow discharge state, and fast charging and discharging state.

[0110] Optionally, the rechargeable battery boosting to charge the electrical device requires two conditions:

[0111] 1) Connecting to the AC power supply; 2) The output voltage of the AC-DC conversion circuit is greater than or equal to the voltage of the discharge output USB interface.

[0112] Optionally, the fast charging voltage output by the AC-DC conversion circuit is a fast charging voltage applied for by an electrical device, and the method further includes:

[0113] If the fast charging voltage requested by the electrical device changes, the output voltage of the AC-DC conversion circuit is adjusted to the fast charging voltage requested by the electrical device through the AC-DC detection control module, and the DC-DC buck-boost detection control module controls the output voltage of the DC-DC buck-boost circuit within a preset range, and the preset range is determined based on the output voltage of the AC-DC conversion circuit.

[0114] It can be seen that in the embodiment of the present application, when the fast charging voltage requested by the electrical equipment changes, the fast charging chip promptly adjusts the output voltage to quickly meet the needs of the electrical equipment, thereby further improving the performance of the fast charging charger.

[0115] It should be noted that the preset control strategy is as described above and will not be described again here.

[0116] It can be seen that in the embodiment of the present application, the fast charging chip controls the fast charging charger to enter the target state according to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, and the preset control strategy, thereby realizing the control of the fast charging charger based on actual conditions and improving the practicality of the charger.

[0117] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A control method for a fast charging charger, characterized in that: A fast charging chip used in a fast charging charger, wherein the fast charging charger comprises: an AC-DC conversion circuit, a rechargeable battery, a discharge output universal serial bus USB interface, a fast charging chip, a DC-DC buck-boost circuit, an input switch and an output switch; The AC-DC conversion circuit is connected to the input end of the input switch and the fast charging chip; the output end of the input switch is connected to the input end of the output switch and the DC-DC buck-boost circuit; the control end of the input switch and the control end of the output switch are connected to the fast charging chip; the output end of the output switch is connected to the discharge output USB interface; the DC-DC buck-boost circuit is also connected to the fast charging chip and the rechargeable battery; the discharge output USB interface is also connected to the fast charging chip; The AC-DC conversion circuit is used to convert the connected alternating current into direct current, and under the control of the fast charging chip, output the direct current to the DC-DC buck-boost circuit or the power-consuming device connected to the discharge output USB interface; The DC-DC buck-boost circuit is used to convert the DC voltage output by the AC-DC conversion circuit into a battery voltage to charge the rechargeable battery, or convert the battery voltage output by the rechargeable battery into a DC voltage to power the electrical device under the control of the fast charging chip; The method comprises: The fast charging chip detects the state of the AC-DC conversion circuit of the fast charging charger, and detects the state of the discharge output universal serial bus USB interface of the fast charging charger; The fast charging chip confirms the fast charging protocol switch status of the connected power-consuming device; According to the state of the AC-DC conversion circuit, the state of the discharge output USB interface, the fast charging protocol switch state of the connected power-consuming device and the preset control strategy, the fast charging charger is controlled to enter the target state, and the target state includes a fast charging and discharging state; wherein the target state also includes one of the following: standby state, slow charging state, fast charging state, slow discharging state, fast discharging state, slow charging and slow discharging state; in, The fast charging voltage output by the AC-DC conversion circuit is the fast charging voltage requested by the electrical device. If the fast charging voltage requested by the electrical device changes, the output voltage of the AC-DC conversion circuit is adjusted to the fast charging voltage requested by the electrical device through the AC-DC detection control module in the fast charging chip, and the DC-DC buck-boost detection control module controls the output voltage of the DC-DC buck-boost circuit within a preset range, and the preset range is determined based on the output voltage of the AC-DC conversion circuit and the fast charging voltages requested by the electrical device for multiple times.

2. The method according to claim 1, characterized in that The fast charging chip includes a control state machine burned with the preset control strategy, and an AC-DC detection control module, a DC-DC buck-boost detection control module, an input switch control module, and an output switch control module independently connected to the control state machine; The preset control strategy includes: If the AC-DC conversion circuit is not connected to an AC power source, and the discharge output USB interface is not connected to an electrical device, the fast charging charger is controlled to enter a standby state; or, If in the standby state, the AC-DC conversion circuit is connected to an AC power supply, the fast charging charger is controlled to enter a slow charging state. In the slow charging state, the control state machine controls the AC-DC conversion circuit to output a default DC voltage through the AC-DC detection control module, and the control state machine controls the DC-DC buck-boost circuit to perform normal charging for the rechargeable battery through the DC-DC buck-boost detection control module; or, If in the slow charging state, and the discharge output USB interface is not connected to an electrical device, the fast charging charger is controlled to enter the fast charging state. In the fast charging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine controls the DC-DC buck-boost circuit to fast charge the rechargeable battery through the DC-DC buck-boost detection control module; or, If in the standby state, and the device is turned on by a button or the discharge output USB interface is connected to an electric device, the fast charge charger is controlled to enter a slow discharge state. In the slow discharge state, the control state machine controls the DC-DC buck-boost circuit to boost the rechargeable battery to the default DC voltage through the DC-DC buck-boost detection control module to perform normal charging for the electric device; If in the slow-discharge state, the electric device has a fast-charge protocol and the fast-charge protocol handshake is successful, the fast-charge charger is controlled to enter the fast-discharge state. In the fast-discharge state, the control state machine controls the DC-DC buck-boost circuit through the DC-DC buck-boost detection control module to fast-charge the electric device. or, If in the slow charging state, and the discharge output USB interface is connected to an electric device, the fast charging charger is controlled to enter a slow charging and slow discharging state. In the slow charging and slow discharging state, the control state machine controls the AC-DC conversion circuit to output the default DC voltage through the AC-DC detection control module, and the control state machine turns on the output switch through the output switch control module to perform normal charging for the electric device. or, If in the fast charging state, and the discharge output USB interface is connected to an electrical device, the fast charging charger is controlled to enter the slow charging and slow discharging state; or, If in the slow charging and discharging state, and the electrical device has a fast charging protocol and the fast charging protocol handshake is successful, the fast charging charger is controlled to enter a fast charging and discharging state. In the fast charging and discharging state, the control state machine controls the AC-DC conversion circuit to output a fast charging voltage through the AC-DC detection control module, and the control state machine turns on the input switch through the input switch control module to fast charge the electrical device; or, If the AC-DC conversion circuit is connected to an AC power source in the fast-discharging state, the fast-charging charger is controlled to enter the fast-charging and discharging state.

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