Charging control circuit, charging control method, charger, and storage medium

Abstract

Embodiments of the present application provide a charging control circuit, a charging control method, a charger and a storage medium. The charging control circuit comprises a control circuit, a first switching circuit, a step-down charging circuit and a switching power supply. The control circuit is connected with a charging port. The first switching circuit is connected with the control circuit and the charging port. The step-down charging circuit comprises a voltage converter and a second switching circuit. The second switching circuit is connected with the voltage converter and the charging port. The voltage converter is connected with the control circuit. The switching power supply is connected with the first switching circuit and the voltage converter. When the requested charging voltage of a to-be-charged device connected with the charging port is consistent with the output voltage of the switching power supply, the output voltage is output to the to-be-charged device through the first switching circuit for charging. The output voltage of the switching power supply does not need to be converted by the voltage converter, so that the energy conversion efficiency of the charging control circuit is improved.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a charging control circuit, a charging control method, a charger, and a storage medium. Background Technology

[0002] With the promotion and popularization of the Power Delivery (PD) protocol in portable electronic products, more and more users are starting to use PD chargers.

[0003] In related technologies, during the charging process of electronic products, PD chargers typically output a charging voltage that matches the electronic device through a step-down converter, thereby charging the electronic device. Due to energy loss during voltage conversion, the energy conversion efficiency of PD chargers is reduced. Summary of the Invention

[0004] To address the aforementioned problems, embodiments of this application provide a charging control circuit, a charging control method, a charger, and a storage medium, which can reduce energy loss during charging.

[0005] In a first aspect, embodiments of this application provide a charging control circuit, including a control circuit, a first switching circuit, a buck charging circuit, and a switching power supply; the control circuit is connected to a charging port; the first switching circuit is connected to the control circuit and the charging port; the buck charging circuit includes a voltage converter and a second switching circuit, the second switching circuit being connected to the voltage converter and the charging port, and the voltage converter being connected to the control circuit; the switching power supply is connected to the first switching circuit and the voltage converter; wherein, when the requested charging voltage of the device to be charged connected to the charging port is consistent with the output voltage of the switching power supply, the control circuit is used to control the first switching circuit to be turned on, and to control the voltage converter and the second switching circuit to be turned off, so that the switching power supply charges the device to be charged through the first switching circuit.

[0006] In some embodiments, the first switching circuit includes a first PMOS transistor, a first parasitic diode, a second PMOS transistor, and a second parasitic diode. The gate of the first PMOS transistor is connected to a control circuit, and the drain of the first PMOS transistor is connected to a switching power supply. The anode of the first parasitic diode is connected to the drain of the first PMOS transistor, and the cathode of the first parasitic diode is connected to the source of the first PMOS transistor. The gate of the second PMOS transistor is connected to the gate of the first PMOS transistor, the source of the second PMOS transistor is connected to the source of the first PMOS transistor, and the drain of the second PMOS transistor is connected to a charging port. The anode of the second parasitic diode is connected to the drain of the second PMOS transistor, and the cathode of the second parasitic diode is connected to the source of the second PMOS transistor.

[0007] In some embodiments, the voltage converter has a conversion input terminal connected to a switching power supply, a conversion output terminal connected to a second switching circuit, and a conversion control terminal connected to a control circuit; the second switching circuit includes a third PMOS transistor, a third parasitic diode, a fourth PMOS transistor, and a fourth parasitic diode; the gate of the third PMOS transistor is connected to the control circuit, and the drain of the third PMOS transistor is connected to the conversion output terminal; the anode of the third parasitic diode is connected to the drain of the third PMOS transistor, and the cathode of the third parasitic diode is connected to the source of the third PMOS transistor; the gate of the fourth PMOS transistor is connected to the gate of the third PMOS transistor, the source of the fourth PMOS transistor is connected to the source of the third PMOS transistor, and the drain of the fourth PMOS transistor is connected to a charging port; the anode of the fourth parasitic diode is connected to the drain of the fourth PMOS transistor, and the cathode of the fourth parasitic diode is connected to the source of the fourth PMOS transistor.

[0008] In some embodiments, the charging control circuit further includes an overvoltage protection circuit, which has a protection input terminal connected to the control circuit and a protection output terminal connected to the drain of the fourth PMOS transistor.

[0009] In some embodiments, the control circuit includes a controller and a protocol chip. The controller is connected to a first switching circuit, a voltage converter, a second switching circuit, and a charging port; the protocol chip is connected to the controller.

[0010] Secondly, embodiments of this application provide a charging control method, which is implemented based on the charging control circuit in any of the above embodiments. The charging control method includes:

[0011] When a device to be charged is detected to be connected to the charging port, the first requested charging voltage of the device to be charged connected to the charging port is obtained;

[0012] When the first requested charging voltage matches the output voltage of the switching power supply, the first switching circuit is turned on, and the voltage converter and the second switching circuit are turned off, so that the switching power supply charges the device to be charged through the first switching circuit.

[0013] In some embodiments, the steps prior to controlling the first switching circuit to turn on and controlling the voltage converter and the second switching circuit to turn off include:

[0014] The control voltage converter outputs a first conversion voltage, which is less than or equal to the output voltage of the switching power supply and the difference between the first conversion voltage and the output voltage is less than a preset value.

[0015] Control the second switch circuit to turn on.

[0016] In some embodiments, the step of controlling the voltage converter and the second switching circuit to turn off includes:

[0017] First, control the second switch circuit to turn off;

[0018] Then control the voltage converter to shut down.

[0019] In some embodiments, the charging control method further includes:

[0020] When the first requested charging voltage is lower than the output voltage of the switching power supply, the voltage converter is controlled to output a second conversion voltage, which is equal to the first requested charging voltage.

[0021] The second switching circuit is turned on so that the voltage converter can charge the device to be charged through the second switching circuit.

[0022] In some embodiments, the steps following the control of the first switching circuit to be turned on and the control of the voltage converter and the second switching circuit to be turned off include:

[0023] Acquire the second requested charging voltage of the device to be charged in real time or at regular intervals;

[0024] When the second requested charging voltage is less than the first requested charging voltage, the control voltage converter outputs a first conversion voltage. The first conversion voltage is less than the output voltage of the switching power supply and the difference between the first and second conversion voltages is less than a preset value.

[0025] Control the second switch circuit to open;

[0026] The first switching circuit is turned off so that the voltage converter can charge the device to be charged through the second switching circuit.

[0027] Thirdly, embodiments of this application provide a charger, which includes the charging control circuit of any of the above embodiments, or performs the steps of any of the above charging control methods.

[0028] Fourthly, embodiments of this application provide a storage medium storing multiple instructions adapted for loading by a processor and executing the steps of any of the above-described charging control methods.

[0029] In summary, this application provides a charging control circuit, a charging control method, a charger, and a storage medium. The charging control circuit includes a control circuit, a first switching circuit, a buck charging circuit, and a switching power supply. The control circuit is connected to a charging port; the first switching circuit is connected to the control circuit and the charging port; the buck charging circuit includes a voltage converter and a second switching circuit, the second switching circuit being connected to the voltage converter and the charging port, and the voltage converter being connected to the control circuit; the switching power supply is connected to the first switching circuit and the voltage converter. When the requested charging voltage of the device connected to the charging port matches the output voltage of the switching power supply, the output voltage is output to the device through the first switching circuit for charging, eliminating the need for voltage conversion of the switching power supply's output voltage via a voltage converter, thereby improving the energy conversion efficiency of the charging control circuit. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the charging control circuit in one embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the charging control circuit in another embodiment of this application;

[0033] Figure 3 This is a circuit diagram of the first switching circuit in one embodiment of this application;

[0034] Figure 4 This is a circuit diagram of the second switching circuit in one embodiment of this application;

[0035] Figure 5 This is a flowchart illustrating a charging control method in one embodiment of this application;

[0036] Figure 6 This is a flowchart illustrating the process of controlling the first switching circuit to conduct and controlling the voltage converter and the second switching circuit according to an embodiment of this application.

[0037] Figure 7 This is a schematic diagram of the process for shutting down the control voltage converter and the second switching circuit according to an embodiment of this application;

[0038] Figure 8 This is a flowchart illustrating a charging control method in one embodiment of this application;

[0039] Figure 9 This is a schematic diagram of the process of controlling the first switch circuit to be turned on and the voltage converter and the second switch circuit to be turned off according to an embodiment of this application. Attached image description:

[0041] 1. Charging control circuit; 10. Control circuit; 101. Controller; 102. Protocol chip; 20. Charging port; 30. First switching circuit; 301. First PMOS transistor; 302. First parasitic diode; 303. Second PMOS transistor; 304. Second parasitic diode; 40. Buck charging circuit; 41. Voltage converter; 41a. Conversion input terminal; 41b. Conversion output terminal; 41c. Conversion control terminal; 42. Second switching circuit; 421. Third PMOS transistor; 422. Third parasitic diode; 423. Fourth PMOS transistor; 424. Fourth parasitic diode; 50. Switching power supply; 60. Overvoltage protection circuit; 60a. Protection input terminal; 60b. Protection output terminal. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0043] Please refer to Figures 1 to 2 In a first aspect, embodiments of this application provide a charging control circuit 1, including a control circuit 10, a first switching circuit 30, a buck charging circuit 40, and a switching power supply 50.

[0044] The control circuit 10 is connected to a charging port 20, which is used to connect to a device to be charged. The control circuit 10 identifies the requested charging voltage of the device to be charged and outputs the requested charging voltage to the charging port 20 to meet the charging needs of the device to be charged (not shown in the figure). For example, when devices to be charged with different requested charging voltages are connected to the charging port 20, the control circuit 10 can output different requested charging voltages to different types of devices to meet their charging needs; or, when the requested charging voltage of the same device to be charged changes, the control circuit 10 can output the changed requested charging voltage to ensure the charging stability of the device to be charged.

[0045] The first switching circuit 30 is connected to the control circuit 10 and the charging port 20. It should be noted that the control circuit 10 can control the conduction and cutoff of the first switching circuit 30, thereby controlling whether the voltage output to the device to be charged is delivered to the charging port 20 through the first switching circuit 30.

[0046] The step-down charging circuit 40 includes a voltage converter 41 and a second switching circuit 42. The voltage converter 41 has a conversion input terminal 41a connected to the switching power supply 50, a conversion output terminal 41b connected to the second switching circuit 42, and a conversion control terminal 41c connected to the control circuit 10. The voltage converter 41 can convert the input voltage value. It can be understood that the voltage converter 41 can be a DC-DC step-down converter. The DC-DC step-down converter has the advantages of fast dynamic response and high efficiency. The DC-DC step-down converter can output conversion voltages such as 5V, 9V, 12V, 15V, 20V, etc. to meet the charging needs of different devices to be charged. In some embodiments, the conversion input terminal 41a of the DC-DC step-down converter can be the IN pin, the conversion output terminal 41b of the DC-DC step-down converter can be the FB pin, and the conversion control terminal 41c of the DC-DC step-down converter can be the EN enable pin.

[0047] The second switching circuit 42 connects the voltage converter 41 to the charging port 20, and the voltage converter 41 is connected to the control circuit 10.

[0048] Furthermore, since both the voltage converter 41 and the second switching circuit 42 are connected to the control circuit 10, and the second switching circuit 42 is connected to the charging port 20, when the device to be charged is connected to the charging port 20, the control circuit 10 can control the voltage converter 41 to output the requested charging voltage required by the device to be charged. The voltage output by the voltage converter 41 is then transmitted to the charging port 20 through the second switching circuit 42 to charge the device. It should be noted that, in addition to controlling the voltage converter 41 to turn on, the control circuit 10 can also control the on and off states of the second switching circuit 42, thereby controlling whether the voltage output by the voltage converter 41 is transmitted to the charging port 20 through the second switching circuit 42.

[0049] The switching power supply 50 is connected to the first switching circuit 30 and the voltage converter 41. The switching power supply 50 can be powered by DC mains and has a stable output voltage, thereby outputting a stable power supply voltage to the first switching circuit 30 and the voltage converter 41.

[0050] Specifically, part of the operation of the charging control circuit 1 is as follows: When the device to be charged is connected to the charging port 20, if the requested charging voltage of the device to be charged is consistent with the output voltage of the switching power supply 50, the control circuit 10 controls the first switching circuit 30 to be turned on, so that the output voltage of the switching power supply 50 is delivered to the charging port 20 through the first switching circuit 30 to charge the device to be charged; since the buck charging circuit 40 will lose energy during the voltage conversion process, the control circuit 10 controls the voltage converter 41 and the second switching circuit 42 to be turned off, so as to prevent the output voltage of the switching power supply 50 from being delivered to the charging port 20 through the buck charging circuit 40, thus eliminating the voltage conversion process of the voltage converter 41 to improve the energy conversion efficiency of the charging control circuit 1.

[0051] In summary, in this embodiment of the application, when the requested charging voltage of the device to be charged connected to the charging port 20 is consistent with the output voltage of the switching power supply, it is not necessary to convert the output voltage of the switching power supply 50 through the voltage converter 41. Instead, the output voltage is directly output to the device to be charged through the first switching circuit 30 for charging, thus eliminating the process of voltage conversion of the output voltage by the voltage converter 41. This can improve the energy conversion efficiency of the charging control circuit 1.

[0052] Furthermore, when the charging port 20 is connected to the device to be charged, the device to be charged has a first requested charging voltage. By sending the first requested charging voltage to the charging port 20, the device to be charged is charged. The charging control circuit 1 of this application determines the relative magnitude between the first requested charging voltage and the output voltage of the switching power supply 50, and selects different charging control methods to charge the device to be charged.

[0053] The following description uses examples of a switching power supply 50 with an output voltage of 20V and 20.8V. In some embodiments, when the first requested charging voltage is consistent with the output voltage of the switching power supply 50, the control circuit 10 first controls the voltage converter 41 to turn on and controls the voltage converter 41 to output a first converted voltage. The first converted voltage may be consistent with the output voltage of the switching power supply 50 (e.g., the output voltage of the switching power supply 50 is 20V), or there may be a difference between it and the output voltage of the switching power supply 50 (e.g., the output voltage of the switching power supply 50 is 20.8V). Subsequently, the control circuit 10 controls the second switching circuit 42 to turn on, so that the voltage converter 41 can output the first converted voltage to the charging port 20 through the second switching circuit 42. Further, after the first converted voltage output by the voltage converter 41 to the device to be charged stabilizes, the control circuit 10 controls the first switching circuit 30 to turn on, so that the output voltage of the switching power supply 50 can be delivered to the charging port through the first switching circuit 30. Port 20; Furthermore, in the charging control circuit 1 at this time, on the one hand, the output voltage of the switching power supply 50 is sent to the charging port 20 through the first switching circuit 30; on the other hand, the output voltage of the switching power supply 50 is converted into a first conversion voltage by the voltage converter 41, and the first conversion voltage is sent to the charging port 20 through the second switching circuit 42. Since the output voltage of the switching power supply 50 will suffer efficiency loss after passing through the voltage converter 41, in order to reduce the efficiency loss that occurs during the charging process of the charging control circuit 1 to the device to be charged, after the control circuit 10 turns on the first switching circuit 30, the control circuit 10 turns off the second switching circuit 42 and the voltage converter 41 in sequence, so that the output voltage of the switching power supply 50 is only sent to the charging port 20 through the first switching circuit 30, avoiding the voltage conversion process of the voltage converter 41, thereby improving the charging efficiency of the charging control circuit 1.

[0054] It is understandable that this embodiment does not directly turn on the first switch circuit 30 to supply power from the switching power supply 50 to the charging port 20. The reason is as follows: If the control circuit 10 directly controls the first switch circuit 30 to turn on, the charging port 20 will receive an output voltage of 20V or 20.8V instantaneously. Due to the sudden voltage change, the charging port 20 may be unable to output a stable voltage to the device being charged, thus preventing the charging control circuit 1 from having a stable charging effect. Furthermore, since the voltage converter 41 can output various voltages such as 5V, 9V, 12V, 15V, and 20V, this embodiment first controls the voltage converter 41 and the second switch circuit 42 to turn on sequentially, so that the voltage output by the voltage converter 41 to the charging port 20 through the second switch circuit 42 can gradually increase to 20V, avoiding sudden voltage changes received by the charging port 20. This allows the charging port 20 to output a stable voltage, providing a stable charging environment for the device being charged. At this time, in the charging control circuit 1, the output voltage of the switching power supply 50 is delivered to the charging port 20 through the voltage converter 41 and the second switch circuit 42. Step by step, after the voltage output from charging port 20 stabilizes, control circuit 10 controls the first switching circuit 30 to open, allowing the output voltage of switching power supply 50 to be delivered to charging port 20 through the first switching circuit 30. It can be understood that when the output voltage of switching power supply 50 is 20V, since the first converted voltage output by voltage converter 41 to charging port 20 through second switching circuit 42 is the same as the voltage output by switching power supply 50 to charging port 20 through first switching circuit 30, voltage surges at charging port 20 can be avoided, ensuring the charging port 20 remains stable. It can output a stable voltage to the device to be charged. When the output voltage of the switching power supply 50 is 20.8V, the first conversion voltage output by the voltage converter 41 to the charging port 20 through the second switching circuit 42 has a difference with the voltage output by the switching power supply 50 to the charging port 20 through the first switching circuit 30. This difference is less than a preset value. That is, although the voltage at the charging port 20 changes abruptly from 20V to 20.8V, the charging port 20 can still output a stable voltage to the device to be charged because the difference between the first conversion voltage and the output voltage is less than the preset value.

[0055] In the charging control circuit 1 at this time, the output voltage of the switching power supply 50 is delivered to the charging port 20 through the first switching circuit 30 on one hand, and through the voltage converter 41 and the second switching circuit 42 on the other hand. Since the output voltage of the switching power supply 50 will suffer efficiency loss after passing through the voltage converter 41, after the control circuit 10 turns on the first switching circuit 30, the control circuit 10 turns off the second switching circuit 42 and the voltage converter 41 in sequence, so that the output voltage of the switching power supply 50 is delivered to the charging port 20 only through the first switching circuit 30, avoiding the voltage conversion process of the voltage converter 41, thereby improving the charging efficiency of the charging control circuit 1.

[0056] The turn-off sequence of the voltage converter 41 and the second switching circuit 42 in the step-down charging circuit 40 is explained here: Since the second switching circuit 42 is connected to the control circuit 10 and the charging port 20, in order to prevent current from flowing back to the control circuit 10, the charging control circuit 1 in this embodiment first turns off the second switching circuit 42 to prevent the current from the charging port 20 from flowing back to the control circuit 10; if the voltage converter 41 is turned off first, the current of the charging port 20 can be transmitted to the control circuit 10 through the second switching circuit 42 before the second switching circuit 42 is turned off, thereby damaging the control circuit 10.

[0057] In other embodiments, when the first requested charging voltage is inconsistent with the output voltage of the switching circuit, that is, when the first requested charging voltage is less than the output voltage of the switching power supply 50, the control circuit 10 first controls the voltage converter 41 and the second switching circuit 42 to turn on, and controls the voltage converter 41 to output a second conversion voltage, which is the same as the first requested charging voltage.

[0058] Understandably, since the first requested charging voltage is different from the output voltage of the switching power supply 50, the control circuit 10 of this embodiment first controls the voltage converter 41 to turn on, so that the voltage converter 41 converts the output voltage of the switching power supply 50 to a second conversion voltage that is the same as the first requested charging voltage; the control circuit 10 then controls the second switching circuit 42 to turn on, so that the voltage converter 41 can send the output second conversion voltage to the charging port 20 through the second switching circuit 42 to charge the device to be charged.

[0059] Furthermore, during the charging process, the device to be charged has a second requested charging voltage. The control circuit 10 acquires the second requested charging voltage of the device to be charged in real time or at regular intervals. The second requested charging voltage of the device to be charged may change during the charging process. That is, the second requested charging voltage may be greater than the first requested charging voltage, or the second requested charging voltage may be less than the first requested charging voltage.

[0060] When the second requested charging voltage of the device to be charged changes during the charging process, the charging control method further includes:

[0061] When the second requested charging voltage is less than the first requested charging voltage, for example, the first requested charging voltage is the output voltage of the switching power supply 50, and the second requested charging voltage is less than the output voltage of the switching power supply 50, in this case, the output voltage of the switching power supply 50 is transmitted to the charging port 20 through the first switching circuit 30 to charge the device to be charged. When the charging device has the second requested voltage, and the second requested voltage is less than the first requested charging voltage, the voltage converter 41 is first turned on, so that the voltage converter 41 outputs the first converted voltage. The first converted voltage is less than the output voltage of the switching power supply 50 and the difference between the first and second converted voltages is less than a preset value, so that the charging port 20 can still stably charge the device to be charged when the voltage changes. Then, the second switching circuit 42 is turned on, so that the first converted voltage output by the voltage converter 41 can be transmitted to the charging port 20 through the second switching circuit 42 to charge the device to be charged. Then, the first switching circuit 30 is turned off. That is, in the charging control circuit 1 at this time, the output voltage of the switching power supply 50 is transmitted to the voltage converter 41, the voltage converter 41 converts the output voltage into a first conversion voltage (the same as the second requested charging voltage), and transmits the first conversion voltage to the charging port 20 through the second switching circuit 42 to charge the device to be charged.

[0062] Understandably, when the second requested charging voltage is less than the first requested charging voltage, and the first requested charging voltage is less than the output voltage of the switching power supply 50, in the charging control circuit 1, the output voltage of the switching power supply 50 is transmitted to the voltage converter 41, which converts the output voltage of the switching power supply 50 into a first conversion voltage. At this time, the first conversion voltage is the same as the first requested charging voltage. The voltage converter 41 transmits the first conversion voltage to the charging port 20 through the second switching circuit 42 to charge the device to be charged. When the charging device has the second requested charging voltage, the first conversion voltage output by the voltage converter 41 is controlled so that the first conversion voltage is the same as the second requested charging voltage. The first conversion voltage is transmitted to the charging port 20 through the second switching circuit 42 to charge the device to be charged.

[0063] When the second requested charging voltage is greater than the first requested charging voltage (for example, when the first requested charging voltage is less than the output voltage of the switching power supply 50 and the second requested charging voltage is equal to the output voltage of the switching power supply 50), in the charging control circuit 1, the output voltage of the switching power supply 50 is transmitted to the voltage converter 41. The voltage converter 41 converts the output voltage into a first conversion voltage, which is equal to the first requested charging voltage. The first conversion voltage is transmitted to the charging port 20 through the second switching circuit 42 to charge the device to be charged. When the device to be charged has the second requested charging voltage, the voltage converter 41 is controlled to output the first conversion voltage. At this time, the first conversion voltage is equal to the second requested charging voltage, that is, the first conversion voltage is equal to the output voltage of the switching power supply 50. The first conversion voltage is transmitted to the charging port 20 through the second switching circuit 42. The power supply 20 is used to charge the device to be charged. When the first conversion voltage output by the voltage converter 41 stabilizes, the first switching circuit 30 is turned on. At this time, the charging voltage output by the switching power supply 50 can simultaneously charge the device to be charged through the first switching circuit 30 and the step-down charging circuit 40. Since the step-down charging circuit 40 has energy loss, after the first switching circuit 30 stabilizes, the controller 101 sequentially controls the second switching circuit 42 and the voltage converter 41 to turn off, so that the output voltage of the switching power supply 50 can charge the device to be charged through the first switching circuit 30, thereby reducing the energy loss of the charging control circuit 1.

[0064] Understandably, when the second requested charging voltage is greater than the first requested charging voltage and less than the output voltage of the switching power supply 50, in the charging control circuit 1, the output voltage of the switching power supply 50 is transmitted to the voltage converter 41, which converts the output voltage of the switching power supply 50 into a first conversion voltage, which is the same as the first requested charging voltage. The first conversion voltage is then transmitted to the charging port 20 through the second switching circuit 42 to charge the device to be charged. When the device to be charged has the second requested charging voltage, the voltage converter 41 is controlled to output the first conversion voltage, which is equal to the second requested charging voltage. The first conversion voltage is then transmitted to the charging port 20 through the second switching circuit 42 to charge the device to be charged.

[0065] Please combine Figures 1 to 3The charging port 20 is connected to the first switching circuit 30 and the second switching circuit 42. When the first switching circuit 30 and the second switching circuit 42 are closed, to prevent the current from the charging port 20 from flowing back into the control circuit 10 through the first switching circuit 30 and damaging the control circuit 10, the first switching circuit 30 includes a first PMOS transistor 301 and a second PMOS transistor 303. The gate of the first PMOS transistor 301 is connected to the control circuit 10, and the drain of the first PMOS transistor 301 is connected to the switching power supply 50. The gate of the second PMOS transistor 303 is connected to the gate of the first PMOS transistor 301. The source of the second PMOS transistor 303 is connected to the source of the first PMOS transistor 301, and the drain of the second PMOS transistor 303 is connected to the charging port 20; the first switching circuit 30 also includes a first parasitic diode 302 and a second parasitic diode 304. The anode of the first parasitic diode 302 is connected to the drain of the first PMOS transistor 301, and the cathode of the first parasitic diode 302 is connected to the source of the first PMOS transistor 301. The anode of the second parasitic diode 304 is connected to the drain of the second PMOS transistor 303, and the cathode of the second parasitic diode 304 is connected to the source of the second PMOS transistor 303.

[0066] Understandably, when the control circuit 10 outputs a high level, that is, when the control circuit 10 controls the first switching circuit 30 to open, the first PMOS transistor 301 and the second PMOS transistor 303 are turned on. The current output by the switching power supply 50 flows from the anode of the first parasitic diode 302 to the cathode of the first parasitic diode 302, then from the cathode of the first parasitic diode 302 to the source of the first PMOS transistor 301, and then from the source of the first PMOS transistor 301 to the source of the second PMOS transistor 303. The current flows from the source to the drain of the second PMOS transistor 303, and then to the charging port 20 to charge the device. When the control circuit 10 controls the first switching circuit 30 to turn off, both the first PMOS transistor 301 and the second PMOS transistor 303 are turned off. Current at the charging port 20 cannot flow to the control circuit 10 through either the first or second PMOS transistor 303, thus preventing backflow of current from the charging port 20 into the control circuit 10 and potentially damaging it. Furthermore, because the second PMOS transistor 303 is turned off, the current output from the switching power supply 50 cannot flow to the charging port 20 through the second PMOS transistor 303 and the second parasitic diode 304, thereby ensuring a stable switching function for the first switching circuit 30.

[0067] Please continue to refer to this. Figure 3The first switching circuit 30 may also include an NPN transistor, the base of which is connected to the control circuit 10, the emitter of which is grounded, and the collector of which is connected to the gate of the second PMOS transistor 303, so as to better prevent the current at the charging port 20 from flowing back to the control circuit 10.

[0068] Please refer to Figure 1 , Figure 2 and Figure 4 To prevent current from the charging port 20 from flowing back into the control circuit 10 via the second switching circuit 42 and damaging the control circuit 10, the second switching circuit 42 includes a third PMOS transistor 421 and a fourth PMOS transistor 423. The gate of the third PMOS transistor 421 is connected to the control circuit 10, and the drain of the third PMOS transistor 421 is connected to the conversion output terminal 41b. The gate of the fourth PMOS transistor 423 is connected to the gate of the third PMOS transistor 421, and the source of the fourth PMOS transistor 423 is connected to the gate of the third PMOS transistor 421. The source is connected, and the drain of the fourth PMOS transistor 423 is connected to the charging port 20; the second switching circuit 42 also includes a third parasitic diode 422 and a fourth parasitic diode 424. The anode of the third parasitic diode 422 is connected to the drain of the third PMOS transistor 421, and the cathode of the third parasitic diode 422 is connected to the source of the third PMOS transistor 421; the anode of the fourth parasitic diode 424 is connected to the drain of the fourth PMOS transistor 423, and the cathode of the fourth parasitic diode 424 is connected to the source of the fourth PMOS transistor 423.

[0069] When the control circuit 10 outputs a high level, that is, when the control circuit 10 controls the second switch circuit 42 to open, the third PMOS transistor 421 and the fourth PMOS transistor 423 are turned on. The conversion current output by the voltage converter 41 flows from the anode of the third parasitic diode 422 to the cathode of the third parasitic diode 422, then from the cathode of the third parasitic diode 422 to the source of the third PMOS transistor 421, and then from the source of the third PMOS transistor 421 to the source of the fourth PMOS transistor 423. The conversion current flows from the source of the fourth PMOS transistor 423 to the drain of the fourth PMOS transistor 423, and then flows to the charging port 20 to charge the device to be charged. When the control circuit 10 controls the second switch circuit 42 to close, the third PMOS transistor 421 and the fourth PMOS transistor 423 are turned off. The current at the charging port 20 cannot flow to the control circuit 10 through the third PMOS transistor or the fourth PMOS transistor 423, thereby preventing the current from the charging port 20 from flowing back into the control circuit 10 and damaging the control circuit 10. Furthermore, since the fourth PMOS transistor 423 is turned off, the conversion current output by the voltage converter 41 cannot flow to the charging port 20 through the fourth PMOS transistor 423 and the fourth parasitic diode 424, thereby enabling the second switching circuit 42 to have a stable switching function.

[0070] Further, please refer to Figure 2 The control circuit 10 includes a controller 101 and a protocol chip 102. The controller 101 may include a microcontroller unit (MCU), etc. The controller 101 is connected to the first switching circuit 30, the voltage converter 41, the second switching circuit 42, and the charging port 20. It is understood that, for the first switching circuit 30, the controller 101 can control the first switching circuit 30 to turn on and off. When the first switching circuit 30 is on, the output voltage of the switching power supply 50 is delivered to the charging port 20 through the first switching circuit 30 to charge the device to be charged. For the buck charging circuit 40, the output voltage of the switching power supply 50 is transmitted to the voltage converter 41. The controller 101 can control the voltage converter 41 to convert the output voltage into the requested charging voltage required by the device to be charged, and deliver the requested charging voltage to the second switching circuit 42. The controller 101 can control the second switching circuit 42 to turn on and off. When the second switching circuit 42 is on, the requested charging voltage output by the voltage converter 41 is delivered to the charging port 20 through the second switching circuit 42 to charge the device to be charged.

[0071] Protocol chip 102 is connected to controller 101 and voltage converter 41. Understandably, after the device to be charged is connected to charging port 20, controller 101 controls voltage converter 41 to output a requested charging voltage. Charging port 20 then transmits the requested charging voltage to the device to be charged. Simultaneously, protocol chip 102 broadcasts a message to the device to be charged, including a variety of preset candidate charging voltages. Upon receiving the message, the device to be charged selects one of these candidate voltages as the requested voltage. This requested voltage is the desired charging voltage for the device. After obtaining the requested voltage from the device to be charged, protocol chip 102 feeds it back to controller 101.

[0072] Please refer to Figure 2 To prevent current from the charging port 20 from flowing back into the control circuit 10, the charging control circuit 1 also includes an overvoltage protection circuit 60. The overvoltage protection circuit 60 has a protection input terminal 60a connected to the control circuit 10 and a protection output terminal 60b connected to the drain of the fourth PMOS transistor 423. The overvoltage protection circuit 60 can protect the control circuit 10 from damage caused by excessive voltage. The protection input terminal 60a of the overvoltage protection circuit 60 can be connected to the controller 101 to prevent current from flowing back into the controller 101 and causing overload damage to the controller 101.

[0073] Please refer to Figure 5Secondly, embodiments of this application provide a charging control method, implemented based on the charging control circuit 1 in any of the above embodiments. The charging control method includes:

[0074] S101, when the device to be charged is detected to be connected to the charging port, the first request charging voltage of the device to be charged connected to the charging port is obtained.

[0075] Before the device to be charged is inserted, the power supply device PSE detects the circuit by using at least two low voltage and current limiting levels. If the power supply device PSE successfully detects the device to be charged, that is, when the device to be charged is connected to the charging port 20, the power supply device PSE obtains the first request charging voltage of the device to be charged. After the power supply device PSE obtains the first request charging voltage of the device to be charged, the power supply device PSE uses the collected information to efficiently distribute the power supply 50 so that the power supply 50 can charge the device to be charged.

[0076] S102, when the first requested charging voltage is consistent with the output voltage of the switching power supply, the first switching circuit is turned on, and the voltage converter and the second switching circuit are turned off, so that the switching power supply charges the device to be charged through the first switching circuit.

[0077] Specifically, when the first requested charging voltage is consistent with the output voltage of the switching power supply 50, the first switching circuit 30 is turned on so that the output voltage of the switching power supply 50 can be delivered to the charging port 20 through the first switching circuit 30 to charge the device to be charged; the voltage converter 41 and the second switching circuit 42 are turned off to prevent the output voltage of the switching power supply 50 from being delivered to the charging port 20 through the step-down charging circuit 40, thus eliminating the voltage conversion process of the voltage converter 41 to the output voltage and improving the energy conversion efficiency of the charging control circuit 1.

[0078] In this embodiment, when the charging device is connected to the charging port 20, it obtains the first requested charging voltage of the device to be charged connected to the charging port 20. When the first requested charging voltage required by the device to be charged is consistent with the output voltage of the switching power supply 50, the output voltage of the switching power supply 50 can bypass the step-down charging circuit 40, so that the output voltage of the switching power supply 50 can be directly delivered to the charging port 20 through the first switching circuit 30 to charge the device to be charged. Since the output voltage of the switching power supply 50 does not pass through the step-down charging circuit 40 to charge the charging port 20, the voltage converter 41 is eliminated from the voltage conversion process, avoiding the energy loss generated by the voltage converter 41 during the voltage conversion process, thereby improving the energy conversion efficiency of the charging control circuit 1.

[0079] Please refer to Figure 6This application provides a feasible embodiment of the steps for controlling the first switching circuit to conduct and controlling the voltage converter and the second switching circuit, which further includes the following steps:

[0080] S201 controls the voltage converter to output a first conversion voltage, the first conversion voltage being less than or equal to the output voltage of the switching power supply and the difference between the first conversion voltage and the output voltage being less than a preset value.

[0081] To avoid voltage fluctuations caused by the instantaneous receipt of output voltage by the charging port 20, which would prevent the charging port 20 from outputting a stable voltage to the device to be charged, the voltage converter 41 is controlled to output a first conversion voltage before the first switching circuit 30 is turned on. The first conversion voltage is less than or equal to the output voltage of the switching power supply 50 and the difference between the first and second conversion voltages is less than a preset value. The preset value setting can ensure that the charging port 20 maintains a relatively stable voltage, thereby providing a relatively stable charging environment for the device to be charged.

[0082] S202 controls the second switch circuit to turn on.

[0083] When the second switching circuit 42 is turned on, the first conversion voltage is delivered to the charging port 20 through the second switching circuit 42. Since the difference between the first conversion voltage and the output voltage is less than the preset value, the charging port 20 can output a stable voltage to the device to be charged, so that the charging control circuit 1 can charge the device to be charged.

[0084] In this embodiment, before the first switching circuit 30 is turned on, the voltage converter 41 is controlled to output a first conversion voltage. The first conversion voltage is less than or equal to the output voltage of the switching power supply 50 and the difference between the first and second conversion voltages is less than a preset value. Then, the second switching circuit 42 is controlled to turn on to avoid excessively large sudden voltages received by the charging port 20, ensuring that the charging port 20 can output a stable voltage to the device to be charged, so that the device to be charged has a stable charging environment.

[0085] Please refer to Figure 7 This application provides a feasible embodiment of the steps for controlling the voltage converter and the second switching circuit to turn off, which further includes the following steps:

[0086] S301, first control the second switch circuit to close.

[0087] To prevent current from flowing back from the charging port 20 to the control circuit 10, in this embodiment, the second switch circuit 42 is first turned off, thereby preventing current from flowing back from the charging port 20 to the control circuit 10 through the second switch circuit 42 and preventing the current flowing back to the control circuit 10 from damaging the control circuit 10.

[0088] S302, then control the voltage converter to shut down.

[0089] After the second switch circuit 42 is turned off, the voltage converter 41 is also turned off to prevent the output voltage of the switching power supply 50 from being delivered to the charging port 20 through the step-down charging circuit 40. This eliminates the need for the voltage converter 41 to perform voltage conversion on the output voltage, thereby reducing the energy loss of the charging control circuit 1.

[0090] In this embodiment, by sequentially controlling the second switching circuit 42 and the voltage converter 41 to turn off, the current at the charging port 20 is prevented from flowing back into the control circuit 10 and causing damage to the control circuit 10.

[0091] Please refer to Figure 8 Furthermore, the charging control method also includes the following steps:

[0092] S401, when the first requested charging voltage is lower than the output voltage of the switching power supply, the voltage converter is controlled to output a second conversion voltage, which is equal to the first requested charging voltage.

[0093] When the first requested charging voltage of the charging port 20 is lower than the output voltage of the switching power supply 50, the output voltage of the switching power supply 50 does not match the first requested charging voltage. The output voltage of the switching power supply 50 cannot directly charge the device to be charged. The output voltage needs to be converted by the voltage converter 41. The voltage converter 41 converts the output voltage into a second converted voltage, which is equal to the first requested charging voltage.

[0094] S402 controls the second switching circuit to open, so that the voltage converter can charge the device to be charged through the second switching circuit.

[0095] In this embodiment, when the first requested charging voltage is lower than the output voltage of the switching power supply 50, the voltage converter 41 is controlled to output a second conversion voltage equal to the first requested charging voltage, and then the second switching circuit 42 is controlled to open, so that the power converter charges the device to be charged through the second switching circuit 42. This embodiment uses the voltage converter 41 to output a second conversion voltage that meets the charging requirements of the device to be charged, thereby ensuring that the charging control circuit 1 can still charge the device to be charged even when the output voltage of the switching power supply 50 is different from the first requested charging voltage.

[0096] Please refer to Figure 9 This application provides a feasible embodiment following the steps of controlling the first switching circuit to be turned on and controlling the voltage converter and the second switching circuit to be turned off, and further includes the following steps:

[0097] S501, acquires the second requested charging voltage of the device to be charged in real time or at regular intervals.

[0098] The second requested charging voltage is the voltage required by the device to be charged during the charging process. Since the second requested charging voltage of the device to be charged may change continuously during the charging process, in order to enable the charging control circuit 1 to charge the device to be charged stably for a long time, this embodiment acquires the second requested charging voltage of the device to be charged in real time or at regular intervals for real-time monitoring of the device to be charged.

[0099] S502, when the second requested charging voltage is less than the first requested charging voltage, the voltage converter is controlled to output a first conversion voltage, which is less than the output voltage of the switching power supply and the difference between the first and second voltages is less than a preset value.

[0100] When the second requested charging voltage changes, the first conversion voltage changes accordingly; when the second requested charging voltage is less than the first requested charging voltage, the first conversion voltage is less than the output voltage of the switching power supply 50 and the difference between the first and second voltages is less than a preset value. The preset value setting can ensure that the charging port 20 maintains a relatively stable voltage, thereby enabling the device to be charged to have a relatively stable charging environment.

[0101] S503 controls the second switch circuit to open.

[0102] This allows the first conversion voltage to be transmitted to the charging port 20 via the second switching circuit 42, so as to charge the device to be charged.

[0103] S504 controls the first switching circuit to close, so that the voltage converter supplies power to the device to be charged through the second switching circuit.

[0104] Closing the first switching circuit 30 can reduce the energy loss of the charging control circuit 1 and improve the energy conversion efficiency of the charging control circuit 1.

[0105] In this embodiment, when the second requested charging voltage of the device to be charged changes during the charging process, the voltage converter 41 is controlled to output the first conversion voltage, the second switch circuit 42 is turned on, and then the first switch circuit 30 is controlled to turn off, so that the first conversion voltage can supply power to the charging port 20 through the second switch circuit 42, ensuring the charging stability of the device to be charged.

[0106] Thirdly, this application provides a charger that includes the charging control circuit 1 described above, or performs the steps of the charging control method described above. Those skilled in the art can understand the charger provided by this application in conjunction with the description of the charging control circuit 1 or the charging control method described above, and will not be elaborated further here.

[0107] Based on the above description, the charger can reduce the power loss during the charging process, thereby reducing the heat generated by the charger during charging.

[0108] Fourthly, this application provides a storage medium storing multiple instructions adapted for loading by a processor and executing the steps of the above-described method.

[0109] Specifically, the steps of the above method can be integrated into one processing unit, or integrated into multiple processing units, with each processing unit existing independently, or two or more processing units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0110] The integrated unit is implemented as a software functional unit and, when sold or used as a standalone product, can be stored in a computer-readable storage medium. It is understood that the storage medium stores multiple instructions suitable for loading by a processor and executing the steps of the aforementioned method.

[0111] Multiple instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute the steps of the above method. The aforementioned storage device may include: USB flash drive, portable hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, server, and other media capable of storing program code.

[0112] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0113] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A charging control circuit, characterized in that, include: A control circuit, wherein the control circuit is connected to a charging port; A first switching circuit is connected to the control circuit and the charging port; A step-down charging circuit includes a voltage converter and a second switching circuit, wherein the second switching circuit is connected to the voltage converter and the charging port, and the voltage converter is connected to the control circuit; A switching power supply, connected to the first switching circuit and the voltage converter; Specifically, when the requested charging voltage of the device to be charged connected to the charging port is consistent with the output voltage of the switching power supply, the control circuit controls the voltage converter to output a conversion voltage and controls the second switching circuit to be turned on. After the conversion voltage output by the voltage converter to the device to be charged stabilizes, the control circuit controls the first switching circuit to be turned on and controls the voltage converter and the second switching circuit to be turned off, so that the switching power supply charges the device to be charged through the first switching circuit. The conversion voltage is less than or equal to the output voltage of the switching power supply and the difference between the conversion voltage and the output voltage is less than a preset value.

2. The charging control circuit as described in claim 1, characterized in that, The first switching circuit includes: The first PMOS transistor has its gate connected to the control circuit and its drain connected to the switching power supply. The first parasitic diode has its anode connected to the drain of the first PMOS transistor and its cathode connected to the source of the first PMOS transistor. The second PMOS transistor has its gate connected to the gate of the first PMOS transistor, its source connected to the source of the first PMOS transistor, and its drain connected to the charging port. The second parasitic diode has its anode connected to the drain of the second PMOS transistor and its cathode connected to the source of the second PMOS transistor.

3. The charging control circuit as described in claim 1, characterized in that, The voltage converter has a conversion input terminal connected to the switching power supply, a conversion output terminal connected to the second switching circuit, and a conversion control terminal connected to the control circuit; the second switching circuit includes: The third PMOS transistor, the gate of which is connected to the control circuit, and the drain of which is connected to the conversion output terminal; The third parasitic diode has its anode connected to the drain of the third PMOS transistor and its cathode connected to the source of the third PMOS transistor. The fourth PMOS transistor has its gate connected to the gate of the third PMOS transistor, its source connected to the source of the third PMOS transistor, and its drain connected to the charging port. The fourth parasitic diode has its anode connected to the drain of the fourth PMOS transistor and its cathode connected to the source of the fourth PMOS transistor.

4. The charging control circuit as described in claim 3, characterized in that, The charging control circuit also includes: The overvoltage protection circuit has a protection input terminal connected to the control circuit and a protection output terminal connected to the drain of the fourth PMOS transistor.

5. The charging control circuit as described in any one of claims 1-4, characterized in that, The control circuit includes: The controller is connected to the first switching circuit, the voltage converter, the second switching circuit, and the charging port; The protocol chip is connected to the controller.

6. A charging control method, characterized in that, The charging control method is implemented based on the charging control circuit according to any one of claims 1-5, and the charging control method includes: When a device to be charged is detected to be connected to the charging port, the first requested charging voltage of the device to be charged connected to the charging port is obtained; When the first requested charging voltage is consistent with the output voltage of the switching power supply, the voltage converter is controlled to output a first conversion voltage, and the second switching circuit is controlled to turn on. The first conversion voltage is less than or equal to the output voltage of the switching power supply and the difference between the first and second conversion voltages is less than a preset value. After the first conversion voltage output by the voltage converter to the device to be charged stabilizes, the first switching circuit is turned on, and the voltage converter and the second switching circuit are turned off, so that the switching power supply charges the device to be charged through the first switching circuit.

7. The charging control method as described in claim 6, characterized in that, The step of controlling the voltage converter and the second switching circuit to turn off includes: First, control the second switch circuit to turn off; Then control the voltage converter to turn off.

8. The charging control method as described in claim 6, characterized in that, The charging control method further includes: When the first requested charging voltage is lower than the output voltage of the switching power supply, the voltage converter is controlled to output a second conversion voltage, which is equal to the first requested charging voltage. The second switching circuit is controlled to open, so that the voltage converter charges the device to be charged through the second switching circuit.

9. The charging control method according to any one of claims 6-8, characterized in that, The steps following the control of the first switching circuit to be turned on and the control of the voltage converter and the second switching circuit to be turned off include: The second requested charging voltage of the device to be charged is acquired in real time or periodically. When the second requested charging voltage is less than the first requested charging voltage, the voltage converter is controlled to output a first conversion voltage, which is less than the output voltage of the switching power supply and the difference between the first and second conversion voltages is less than a preset value. Control the second switch circuit to open; The first switching circuit is turned off so that the voltage converter charges the device to be charged through the second switching circuit.

10. A charger, characterized in that, The charger includes the charging control circuit as described in any one of claims 1-5, or performs the steps of the method as described in any one of claims 6-9.

11. A storage medium, characterized in that, The storage medium stores a plurality of instructions adapted for loading by a processor and executing the steps of the method as described in any one of claims 6-9.

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