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

Abstract

The application discloses a charging control circuit, a charging control method, a charger and a storage medium. The charging control circuit comprises a controller, a flyback circuit and a plurality of charging circuits. Each of the plurality of charging circuits comprises a bypass circuit, a voltage converter, a protocol chip and a charging port. The flyback circuit is connected to a charging power supply and directly outputs a charging voltage required by a device to be charged to the device to be charged through the bypass circuit under the control of the controller, without converting the output voltage of the flyback circuit through the voltage converter and then outputting the converted voltage to the device to be charged, thereby improving the power energy conversion efficiency from the power supply to the device to be charged.

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 choosing PD chargers with dual or multiple charging ports.

[0003] In related technologies, during the charging process of electronic products by a PD charger, firstly, the high-voltage AC mains power needs to be converted into a predetermined DC voltage. Then, according to the charging voltage required by the electronic product, the predetermined DC voltage is converted into the charging voltage required by the electronic product to charge the electronic device. The voltage undergoes two stages of voltage conversion from high-voltage AC mains power to the charging voltage required by the electronic product. Since there is energy loss at each stage of voltage conversion, the energy conversion efficiency of the PD charger is reduced. Summary of the Invention

[0004] This application provides a charging control circuit, a charging control method, a charger, and a storage medium, which can effectively solve the problem of low conversion efficiency of PD chargers caused by two-stage voltage conversion in existing charging circuits.

[0005] In a first aspect, embodiments of this application provide a charging control circuit, including a controller, a flyback circuit, and a multi-channel charging circuit. The flyback circuit is connected to the controller and is used to convert the power supply voltage into the charging voltage required by the device to be charged, so as to charge the device.

[0006] A multi-channel charging circuit is connected to a flyback circuit to deliver the charging voltage output by the flyback circuit to the device to be charged. Each charging circuit includes a bypass circuit, a voltage converter, a protocol chip, and a charging port. The device to be charged is connected to the charging port.

[0007] The flyback circuit has two outputs. The first output is electrically connected to the charging port through a bypass circuit, and the bypass circuit is also electrically connected to the controller to control the switching on and off of the bypass circuit. The second output is electrically connected to the charging port through a voltage converter and a protocol chip, and the voltage converter is also electrically connected to the controller.

[0008] The protocol chip is connected to the controller. The protocol chip is used to communicate with the device to be charged to determine the requested voltage of the device to be charged and send the requested voltage signal to the controller. The controller controls the flyback circuit to output a charging voltage equal to the requested voltage, and at the same time controls the bypass circuit to be turned on so that the charging voltage is delivered to the device to be charged through the bypass circuit.

[0009] In some embodiments, the bypass circuit is a semiconductor switching device, which is provided with a bypass control terminal connected to the controller, a bypass input terminal connected to the output terminal of the flyback circuit, and a bypass output terminal connected to the charging port.

[0010] Specifically, when the flyback circuit outputs a charging voltage equal to the requested voltage, the controller controls the semiconductor switching device to turn on, and the charging voltage is delivered to the device to be charged through the semiconductor switching device.

[0011] In some embodiments, the flyback circuit includes a rectifier circuit and a transformer.

[0012] The rectifier circuit is connected to the power supply and is used to convert the AC signal input by the power supply into a DC signal;

[0013] The transformer is connected to the rectifier circuit and the multiple charging circuit to convert the DC signal into a charging voltage equal to the requested voltage.

[0014] In some embodiments, the transformer includes a primary winding and a secondary winding coupled to the primary winding. A switching transistor and a capacitor are connected in series in the secondary winding. The switching transistor is used to control the storage and release of energy by the capacitor. Alternatively,

[0015] A transformer includes a primary winding and a secondary winding coupled to the primary winding. A diode and a capacitor are connected in series in the secondary winding. The diode is used to control the storage and release of energy by the capacitor.

[0016] Secondly, embodiments of this application provide a charging control method, which is implemented based on the aforementioned charging control circuit. The charging control method includes:

[0017] Receive the first request voltage sent by the protocol chip of the first channel of the first charging circuit;

[0018] Control the flyback circuit to output a charging voltage equal to the first requested voltage;

[0019] The bypass circuit of the first path is turned on to output the charging voltage through the bypass circuit of the first path, and the voltage converter of the first path is turned off after a first preset time.

[0020] In some embodiments, after the steps of controlling the bypass circuit of the first path to be turned on, so as to output the charging voltage through the bypass circuit of the first path, and controlling the voltage converter of the first path to be turned off after a first preset time, the method further includes:

[0021] Upon receiving a second request voltage from the protocol chip of the second charging circuit, determine whether the second request voltage is equal to the first request voltage;

[0022] When the values ​​are equal, the bypass circuit of the second path of the second charging circuit is turned on, and the voltage converter of the second charging circuit is turned off after a second preset time.

[0023] When the voltages are unequal, the voltage converter of the second charging circuit remains on and outputs a charging voltage equal to the second requested voltage, while the bypass circuit of the second charging circuit remains off.

[0024] In some embodiments, the step of controlling the flyback circuit to output a charging voltage equal to the first requested voltage includes:

[0025] Determine whether the preset output voltage of the flyback circuit is equal to the first requested voltage;

[0026] When the values ​​are equal, the preset output voltage is used as the charging voltage output.

[0027] If they are not equal, the preset output voltage is adjusted to be equal to the first requested voltage and then output.

[0028] In some embodiments, prior to the step of receiving the first requested voltage sent by the protocol chip of the first charging circuit, the method includes:

[0029] Before the step of receiving the first requested voltage sent by the protocol chip of the first channel of the first channel of the charging circuit, the following steps are included:

[0030] Control the flyback circuit to output a preset output voltage, and control the voltage converter of the first path to turn off and the bypass circuit of the first path to turn off;

[0031] Upon receiving a connection signal from the protocol chip of the first channel of the first charging circuit, the device controls the voltage converter of the first channel to turn on and output a preset charging voltage, and controls the protocol chip of the first channel to broadcast a message. The message includes a variety of preset candidate charging voltages. The device to be charged confirms that it is connected to the protocol chip of the first channel according to the preset charging voltage and receives the message. It selects one charging voltage from the variety of candidate charging voltages in the message as the first requested voltage and sends the first requested voltage to the protocol chip of the first channel so that the protocol chip of the first channel can forward the first requested voltage.

[0032] Thirdly, embodiments of this application provide a charger, which includes the charging control circuit described above, or performs the steps of the charging control method described above.

[0033] Fourthly, embodiments of this application provide a storage medium storing multiple instructions adapted for loading by a processor and executing the steps of the charging control method described above.

[0034] Based on the charging control circuit in the embodiments of this application, under the control of the controller, the flyback circuit is connected to the power supply and directly outputs the charging voltage required by the device to be charged to the device to be charged through the bypass circuit. There is no need to convert the output voltage of the flyback circuit through a voltage converter before outputting it to the device to be charged, thereby improving the power energy conversion efficiency from the power supply to the device to be charged. Attached Figure Description

[0035] 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.

[0036] Figure 1 This is a schematic diagram of the charging control circuit in one embodiment of this application;

[0037] Figure 2 This is a circuit diagram of a charging control circuit in one embodiment of this application;

[0038] Figure 3 This is a circuit diagram of a flyback circuit in one embodiment of this application;

[0039] Figure 4 This is a flowchart illustrating a charging control method in one embodiment of this application;

[0040] Figure 5 This is a flowchart illustrating a charging control method in another embodiment of this application;

[0041] Figure 6 This is a flowchart illustrating a charging control method in yet another embodiment of this application;

[0042] Figure 7 This is a flowchart illustrating the charging control method in another embodiment of this application. Detailed Implementation

[0043] 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.

[0044] This application provides a charging control circuit; please refer to...Figures 1-2 The charging control circuit includes a controller 10, a flyback circuit 20, and a multi-channel charging circuit D. Figure 1 Only two charging circuits D are shown, referred to as the first charging circuit 30 and the second charging circuit 40. It should be understood that the charging control circuit in this application may include one flyback circuit 20 and multiple charging circuits D, and the multiple charging circuits D are connected to the same flyback circuit 20.

[0045] The flyback circuit 20 has a controlled terminal 20a, a power input terminal 20b, and a power output terminal 20c. The controlled terminal 20a is connected to the controller 10, and the controller 10 controls the flyback circuit 20 through the controlled terminal 20a. For example, the controller 10 can control the voltage VBUS output by the flyback circuit 20 to meet the charging requirements of the device to be charged (not shown in the figure).

[0046] The power input terminal 20b is used to connect to a charging power source. It should be noted that the charging power source in the flyback circuit 20 can be AC ​​mains power. The flyback circuit 20 is used to convert the AC signal into a voltage VBUS, and the magnitude of the VBUS voltage is controlled by the controller 10.

[0047] The connections between the components in each charging circuit of the multi-channel charging circuit D are the same. The first charging circuit 30 will be used as an example for further explanation.

[0048] The first charging circuit 30 includes a bypass circuit 31, a voltage converter 32, a protocol chip 33, and a charging port 34. The bypass circuit 31 has a bypass control terminal 31a connected to the controller 10, a bypass input terminal 31b connected to the power output terminal 20c, and a bypass output terminal 31c connected to the charging port 34. It is understood that the controller 10 is connected to the bypass control terminal 31a to control the switching on and off of the bypass circuit 31, thereby controlling whether the voltage VBUS output by the flyback circuit 20 is delivered to the charging port 34 through the bypass circuit 31. Specifically, the controller 10 can control the bypass circuit 31 to be turned on so that the voltage VBUS output by the flyback circuit 20 is delivered to the charging port 34 through the bypass circuit 31. Since the device to be charged is connected to the charging port 34, the voltage VBUS output by the flyback circuit 20 can be directly charged through the bypass circuit 31. The controller 10 can also control the bypass circuit 31 to be turned off so that the voltage VBUS output by the flyback circuit 20 cannot be connected to the charging port 34 through the bypass circuit 31.

[0049] The voltage converter 32 has a conversion control terminal 32a, a conversion input terminal 32b, and a conversion output terminal 32c. The conversion control terminal 32a is connected to the controller 10, the conversion input terminal 32b is connected to the power output terminal 20c, and the conversion output terminal 32c is connected to the charging port 34. The controller 10 can control the voltage converter 32 to turn on or off via the conversion control terminal 32a, and can also control the output voltage of the voltage converter 32 to meet the different charging voltage requirements of different devices to be charged.

[0050] The flyback circuit 20 has two outputs. The first output is electrically connected to the charging port 34 through the bypass circuit 31, and the second output is electrically connected to the charging port 34 through the voltage converter 32 and the protocol chip 33.

[0051] Specifically, the flyback circuit 20 is electrically connected to the charging port 34 via the voltage converter 32 and the protocol chip 33. The protocol chip 33 is connected to the controller 10 and the voltage converter 32. It can be understood that after the device to be charged is connected to the charging port 34, the controller 10 controls the voltage converter 32 to output a preset charging voltage. The charging port 34 then delivers the preset charging voltage to the device to be charged. Simultaneously, the protocol chip 33 broadcasts a message to the device to be charged, which includes a variety of preset candidate charging voltages. Upon receiving the message, the device to be charged selects one of the candidate voltages as its requested voltage. This requested voltage is the charging voltage desired by the device. After obtaining the requested voltage from the device to be charged, the protocol chip 33 feeds it back to the controller 10.

[0052] The charging port 34 is used for electrical connection with the device to be charged. The charging port 34 is also connected to both the bypass output terminal 31c and the conversion output terminal 32c. It can be understood that the charging port 34 is connected to the power output terminal 20c through two loops. Specifically, the first loop is: flyback circuit 20 - voltage converter 32 - charging port 34; the second loop is: flyback circuit 20 - bypass circuit 31 - charging port 34.

[0053] Specifically, part of the charging control circuit process is as follows: When the device to be charged is connected to one of the charging ports 34, the protocol chip 33, which is electrically connected to the charging port 34, detects that the charging port 34 is electrically connected to the device to be charged. It then controls the voltage converter 32 corresponding to the charging port 34 to output a preset charging voltage (usually 5V). The charging port 34 outputs the preset charging voltage to the device to be charged. Simultaneously, the protocol chip 33 communicates with the device to be charged to obtain the requested voltage from the device and transmits the requested voltage to the controller 10. After receiving the requested voltage, the controller 10 controls... The controller 10 controls the flyback circuit 20 to output a charging voltage equal to the requested voltage of the device to be charged, and controls the bypass circuit 31 to be turned on. The charging voltage output by the flyback circuit 20 is delivered to the charging port 34 connected to the device to be charged through the bypass circuit 31. When the voltage VBUS output by the flyback circuit 20 can be stably delivered to the device to be charged through the bypass circuit 31, the controller 10 controls the voltage converter 32 to be turned off to avoid the charging interruption phenomenon caused by turning off the voltage converter 32 when the charging voltage output by the bypass circuit 31 is not stable (the charging interruption phenomenon is also the phenomenon of the charging process of the device to be charged being interrupted).

[0054] In summary, in this embodiment, there is no need to convert the voltage VBUS output by the flyback circuit 20 through the voltage converter 32. Instead, the voltage VBUS output by the flyback circuit 20 is adjusted to be the same as the requested voltage of the device to be charged, and the voltage VBUS is directly output to the device to be charged through the bypass circuit 31 for charging. This eliminates the need for the voltage converter 32 to convert the voltage VBUS, thereby improving the energy conversion efficiency of the charging control circuit.

[0055] To facilitate the controller 10 in controlling the switching of the bypass circuit 31, the bypass circuit 31 can be a semiconductor switching device. The semiconductor switching device has a bypass control terminal 31a connected to the controller 10, a bypass input terminal 31b connected to the power output terminal 20c, and a bypass output terminal 31c connected to the charging port 34. When the flyback circuit 20 outputs a charging voltage equal to the requested voltage, the controller 10 controls the semiconductor switching device to turn on, and the charging voltage is delivered to the device to be charged through the semiconductor switching device.

[0056] In some specific embodiments, the bypass circuit 31 may also include a field-effect transistor, such as a PMOS transistor or an NMOS transistor. When the bypass circuit 31 includes a PMOS transistor, the drain of the PMOS transistor is connected to the power output terminal 20c as the bypass input terminal 31b, the source of the PMOS transistor is connected to the charging port 34 as the bypass output terminal 31c, and the gate of the PMOS transistor is the bypass control terminal 31a. Therefore, the controller 10 can control the conduction and turn-off of the PMOS transistor by controlling the gate of the PMOS transistor. When the bypass circuit 31 includes an NMOS transistor, the drain of the NMOS transistor is connected to the charging port 34 as the bypass output terminal 31c, the source of the NMOS transistor is connected to the power output terminal 20c as the bypass input terminal 31b, and the gate of the NMOS transistor is the bypass control terminal 31a.

[0057] To convert AC signals to DC signals and to convert the voltage of DC signals, please refer to [reference needed]. Figure 2 The flyback circuit 20 includes a rectifier circuit 21 and a flyback transformer 22. The rectifier circuit 21 is connected to the AC mains power and is used to convert AC signals into DC signals.

[0058] Specifically, the rectifier circuit 21 can be a diode rectifier circuit. The two input terminals of the diode rectifier circuit are connected to the first input terminal N and the second input terminal L, respectively. That is, the AC signal is connected to the diode rectifier circuit through the first input terminal N and the second input terminal L. The two output terminals of the diode rectifier circuit are connected to the positive input terminal Vin+ and the negative input terminal Vin of the flyback transformer 22.

[0059] The flyback transformer 22 receives the DC signal output from the rectifier circuit 21 and converts the magnitude of the DC signal to output voltage VBUS.

[0060] Please refer to Figure 2 The flyback transformer 22 includes a positive input terminal Vin+ and a negative input terminal Vin, which are used to receive the DC signal output by the rectifier circuit 21. The flyback transformer 22 includes a primary winding N1 and a secondary winding N2 coupled to the primary winding N1. The primary winding N1 is connected in series with a switching transistor Q1, and the secondary winding N2 is connected in series with a switching transistor Q2 and a capacitor C. By controlling the conduction time of the switching transistor Q1, the amount of energy stored in the primary winding N1 can be controlled.

[0061] In some specific embodiments, the switching transistor Q1 may include a transistor connected in series with the primary winding N1, that is, the collector and emitter of the transistor are connected to the primary winding N1, and the controller 10 is connected to the base of the transistor to control the switching on and off of the switching transistor Q1 and the conduction duration; the switching transistor Q1 may also include a field-effect transistor, with the drain and source of the field-effect transistor connected to the primary winding N1, and the controller 10 is connected to the gate of the field-effect transistor to control the switching on and off of the field-effect transistor and the conduction duration.

[0062] The switching transistor Q2 may include a transistor connected in series with the secondary winding N2, that is, the collector and emitter of the transistor are connected to the secondary winding N2. The controller 10 is connected to the base of the transistor to control the switching on and off of the switching transistor Q2 and the conduction time. The switching transistor Q2 may also include a field-effect transistor (FET), with the drain and source of the FET connected to the secondary winding N2. The controller 10 is connected to the gate of the FET to control the switching on and off of the FET and the conduction time.

[0063] Specifically, please refer to Figure 2 Under the control of the controller 10, the switch Q1 is in the conducting state. At this time, the positive output terminal Vin+-primary winding N1-switch Q1-ground constitutes the charging circuit of the flyback transformer 22, or the positive output terminal Vin+-primary winding N1-switch Q1-negative output terminal Vin constitutes the charging circuit of the flyback transformer 22. The charging circuit converts the DC signal output by the rectifier circuit 21 into magnetic energy and stores it in the primary winding N1 of the flyback transformer 22.

[0064] It should be noted that the controller 10 can control the on-time of the switching transistor Q1 according to the requested voltage required by the device to be charged, thereby controlling the amount of energy stored in the primary winding N1 of the flyback transformer 22. Afterwards, the controller 10 controls the switching transistor Q1 to turn off and controls Q2 to turn on. At this time, the secondary winding N2 of the flyback transformer 22 releases energy, which is stored in the capacitor C. Further, the controller 10 controls Q2 to turn off, causing the capacitor C to release energy and output voltage VBUS.

[0065] In some other embodiments, please refer to Figure 3The flyback transformer 22 includes a primary winding N1 and a secondary winding N2 coupled to the primary winding N1. The secondary winding N2 may also have a diode DB and a capacitor C connected in series. Specifically, the flyback transformer 22 includes a positive input terminal Vin+ and a negative input terminal Vin. The positive input terminal Vin+ is connected to terminal N1-1 of the primary winding N1 of the flyback transformer 22. The diode DB is connected in series to the secondary winding N2, and the cathode of the diode DB is connected to terminal N2-1 of the secondary winding N2 via the capacitor C. Terminals N1-1 and N2-1 are the same-name terminals of the flyback transformer 22. When the switch Q1 is turned on, the energy stored in the primary winding N1 of the flyback transformer 22 increases, and terminal N2-1 becomes the positive terminal, causing the diode DB to be in a reverse cutoff state. When the switch Q1 is turned off, the secondary winding N2 of the flyback transformer 22 releases energy. At this time, the diode DB is in a forward conducting state, and the energy released by the secondary winding N2 is stored in the capacitor C through the diode DB.

[0066] Please refer to Figure 2In the charging circuit 30, the input terminal 32b of the voltage converter 32 is connected to the capacitor C via the power output terminal 20c, and the output terminal 32c is connected to the charging port 34. At the same time, the bypass circuit 31 is connected in parallel with the voltage converter 32, that is, there are two charging loops: the capacitor C-voltage converter 32-charging port 34 constitute the first charging loop; the capacitor C-bypass circuit 31-charging port 34 constitute the second charging loop. When the controller 10 detects that the device to be charged is connected to the charging port 34, the output voltage of the voltage converter 32's conversion output terminal 32c is 5V (an exemplary preset charging voltage). The protocol chip 33 broadcasts a message (i.e., a PDO, power data object) to the device to be charged. The message includes a variety of preset selectable charging voltages, such as 5V, 9V, 12V, 15V, 20V, etc. The device to be charged selects one of the various selectable charging voltages as the requested voltage (e.g., the requested voltage is 20V) and sends the requested voltage to the protocol chip 33. After obtaining the requested voltage, the protocol chip 33 forwards the requested voltage to the controller 10. When the controller 10 receives the requested voltage from the device to be charged at the charging port 34, the controller 10 adjusts the voltage VBUS output by the flyback circuit 20 to the requested voltage required by the device. At this time, the controller 10 controls the bypass circuit 31 to open, and the voltage VBUS output by the flyback circuit 20 is supplied to the charging port 34 through the bypass circuit 31 to charge the device. This continues until the output voltage of the flyback circuit 20 can stably charge the device, at which point the controller 10 controls the voltage converter 32 to turn off. That is, the voltage VBUS output by the flyback circuit 20 directly charges the device. By eliminating the need for the voltage converter 32 to convert the voltage required by the device, the energy conversion efficiency of the device can be improved. In some specific embodiments, the controller may include a microcontroller unit (MCU).

[0067] It should be noted that the energy output by capacitor C in flyback circuit 20 is delivered to power output terminal 20c to form voltage VBUS. The energy output by capacitor C at any given time is the sum of the total energy output by multiple charging ports 34. Since the multiple charging circuits 30 are connected in parallel, the charging voltage output by each charging circuit 30 is equal. Under the condition that the charging voltage is equal, the current connected to the device to be charged in each circuit may be different.

[0068] To facilitate a detailed description of the charging process of the charging control circuit, the following explanation uses the charging process of two charging circuits, namely the first charging circuit 30 and the second charging circuit 40, as an example:

[0069] Please refer to Figure 2The first charging circuit 30 is equipped with a first charging port 34 (Port1), and the second charging circuit 40 is equipped with a second charging port 44 (Port2). A first device to be charged can be connected to the first charging port 34 (Port1), and a second device to be charged can be connected to the second charging port 44 (Port2). It is understood that the first charging port 34 (Port1) and the second charging port 44 (Port2) are merely for easy differentiation; both provide the same specific function.

[0070] After the first device to be charged is connected to the first charging port 34 (Port1), the first protocol chip 33, which is electrically connected to the first charging port 34 (Port1), detects that the first charging port 34 (Port1) is electrically connected to the first device to be charged. Then, the controller 10 controls the voltage converter 32 of the first channel corresponding to the first charging port 34 (Port1) to output a preset charging voltage. The first charging port 34 (Port1) outputs the preset charging voltage to the first device to be charged. After that, the first protocol chip 33 communicates with the first device to be charged to obtain the first requested voltage of the first device to be charged and feeds back the first requested voltage to the controller 10.

[0071] The controller 10 controls the flyback circuit 20 to output a charging voltage equal to the first requested voltage, and simultaneously controls the bypass control terminal 31a to turn on the bypass circuit 31. The voltage is then supplied to the first charging port 34 (Port1) through the bypass circuit 31 to charge the first device to be charged. Once the voltage supplied by the flyback circuit 20 to the first charging port 34 (Port1) through the first bypass circuit 31 is stable, the controller 10 controls the first voltage converter 32 to turn off. The charging voltage for the first device to be charged is then provided by the flyback circuit 20 through the first bypass circuit 31.

[0072] Furthermore, when the first device to be charged is charging stably, the second device to be charged is connected to the second charging port 44 (Port2). The protocol chip 33 of the second channel, which is electrically connected to the second charging port 44 (Port2), detects that the second charging port 44 (Port2) is electrically connected to the second device to be charged. Then, the controller 10 controls the voltage converter 42 of the second channel corresponding to the second charging port 44 (Port2) to output a preset charging voltage. The second charging port 44 (Port2) outputs the preset charging voltage to the second device to be charged, so that the protocol chip 43 of the second channel can communicate with the second device to obtain the second requested voltage of the second device to be charged, and feed back the second requested voltage to the controller 10. After receiving the second requested voltage, the controller 10 determines whether the second requested voltage is equal to the first requested voltage. If the second requested voltage is equal to the first requested voltage, the controller 10 controls the bypass control terminal 41a of the second channel to enable the second charging circuit 40 to... When the second bypass circuit 41 is turned on, the charging voltage output by the flyback circuit 20 is delivered to the second charging port 44 (Port2) through the second bypass circuit 41 to supply the second device to be charged. At this time, the controller 10 controls the second voltage converter 42 of the second charging circuit 40 to turn off. The charging voltage of the second device to be charged is provided by the flyback circuit 20 through the second bypass circuit 41. That is, the first charging circuit 30 charges the first device to be charged through the first bypass circuit 31, and the second charging circuit 40 charges the second device to be charged through the second bypass circuit 41. Neither the first voltage converter 32 nor the second voltage converter 42 needs to perform voltage conversion, thereby further improving the energy conversion efficiency. It should be noted that when the second requested voltage is not equal to the first requested voltage, the controller 10 controls the second voltage converter 42 of the second charging circuit 40 to adjust to the second requested voltage required for charging the second device to be charged, so as to realize the charging of the second device to be charged. In this case, the controller 10 controls the second bypass circuit 41 to be in the off state. However, since the first bypass circuit 31 is in the on state at this time, the first voltage converter 32 does not need to perform voltage conversion. Compared with the scheme where the first charging circuit 30 is charged through the first voltage converter 32 and the second charging circuit 40 is charged through the second voltage converter 42, the energy conversion efficiency is still improved.

[0073] It should be noted that the above charging process only applies when there are two charging circuits. The first charging circuit 30 is the first charging circuit that the first device to be charged is connected to, and the second charging circuit 40 is the charging circuit that the second device to be charged is connected to after the first device to be charged is connected. When there are three or more charging circuits, the charging process is the same as that of the second charging circuit 40, and will not be described again here.

[0074] Secondly, this application provides a charging control method, please refer to... Figure 4 The charging control method is implemented based on the above-mentioned charging control circuit, and the charging control method includes:

[0075] S101, receive the first request voltage sent by the protocol chip 33 of the first channel of the first channel of the charging circuit 30;

[0076] It is understood that the first charging circuit 30 includes a first charging port 34 (Port1). The first device to be charged is connected to the first charging port 34 (Port1). At this time, the voltage converter 32 of the first circuit is electrically connected to the first device to be charged. The protocol chip 33 of the first circuit provides the first device to be charged with a variety of preset selectable charging voltages in the form of broadcast messages, so that the first device to be charged can select one of the various selectable charging voltages as the first requested voltage. The first device to be charged transmits the first requested voltage to the protocol chip 33 of the first circuit, and the protocol chip 33 of the first circuit forwards the first requested voltage to the controller 10.

[0077] S102, control the flyback circuit 20 to output a charging voltage equal to the first requested voltage;

[0078] Specifically, the controller 10 controls the flyback circuit 20 to adjust the output voltage VBUS so that the flyback circuit 20 outputs a charging voltage equal to the first requested voltage.

[0079] S103, control the bypass circuit 31 of the first path to be turned on, so as to output the charging voltage through the bypass circuit 31 of the first path, and control the voltage converter 32 of the first path to be turned off after a first preset time.

[0080] Understandably, when the flyback circuit 20 adjusts its output charging voltage to be equal to the first requested voltage, the controller 10 controls the first bypass circuit 31 of the first charging circuit 30 to be turned on. The flyback circuit 20 then delivers the output charging voltage to the first charging port 34 (Port1) through the first bypass circuit 31 to charge the first device to be charged. After the charging voltage of the first device to be charged stabilizes, i.e., after a first preset time, the controller 10 controls the first voltage converter 32 in the first charging circuit 30 to be turned off. Afterward, the charging voltage output by the flyback circuit 20 is delivered to the first charging port 34 (Port1) through the bypass circuit 31 to charge the first device to be charged. It should be noted that the first preset time is the waiting time before the flyback circuit 20 can stably deliver the charging voltage to the first device to be charged through the first bypass circuit 31. The specific duration can be determined according to the actual situation, and this embodiment does not limit it.

[0081] In this embodiment, since the flyback circuit 20 is connected to the first charging port 34 (Port1) through the first bypass circuit 31, the charging voltage output by the flyback circuit 20 is delivered to the first device to be charged to charge the first device to be charged. Since the first device to be charged is no longer charged through the first voltage converter 32, the voltage conversion process of the first voltage converter 32 is reduced, and the energy conversion efficiency for charging the first device to be charged is improved.

[0082] In some embodiments, after step S103, the following steps are further included:

[0083] S104, when receiving the second request voltage sent by the protocol chip 43 of the second channel of the second channel charging circuit 40, determine whether the second channel request voltage is equal to the first request voltage;

[0084] Specifically, please refer to Figure 5 After the first device to be charged is connected to the first charging port 34 (Port1), when the second device to be charged is connected to the second charging port 44 (Port2), the protocol chip 42 of the second channel communicates with the second device to be charged to obtain the second requested voltage of the second device to be charged, and sends the second requested voltage to the controller 10. After the controller 10 obtains the second requested voltage, since the charging voltage output by the flyback circuit 20 is equal to the first requested voltage at this time, it is necessary to compare the first requested voltage and the second requested voltage to determine whether to turn on the bypass circuit 41 of the second channel.

[0085] S105, when the values ​​are equal, control the bypass circuit 41 of the second path of the second path of the charging circuit 40 to be turned on, and control the voltage converter 42 of the second path of the charging circuit 40 to be turned off after a second preset time.

[0086] Specifically, when the first requested voltage is equal to the second requested voltage, the controller 10 controls the second bypass circuit 41 of the second charging circuit 40 to be turned on. The flyback circuit 20 is connected to the second charging port 44 (Port2) through the second bypass circuit 41 to charge the second device to be charged. After the charging voltage of the second device to be charged stabilizes, that is, after a second preset time, the controller 10 controls the second voltage converter 42 in the second charging circuit 40 to be turned off. After that, the charging voltage output by the flyback circuit 20 is delivered to the second charging port 44 (Port2) through the second bypass circuit 41 to charge the second device to be charged. It should be noted that the second preset time is the waiting time before the flyback circuit 20 can stably deliver the charging voltage to the second device to be charged through the second bypass circuit 41. The specific duration can be determined according to the actual situation, and this embodiment does not limit it. In this embodiment, the first charging circuit 30 charges the first device to be charged through the first bypass circuit 31, and the second charging circuit 40 charges the second device to be charged through the second bypass circuit 41. Neither of these circuits requires voltage conversion by the first voltage converter 32 or the second voltage converter 42, thereby further improving the energy conversion efficiency.

[0087] S106, when they are not equal, keep the voltage converter 42 of the second path of the second path of the charging circuit 40 open and output a charging voltage equal to the second requested voltage, while keeping the bypass circuit 41 of the second path of the charging circuit 40 closed.

[0088] Specifically, when the first requested voltage and the second requested voltage are not equal, that is, when the charging voltage currently output by the flyback circuit 20 is not equal to the second requested voltage, the controller 10 controls the voltage converter 42 of the second channel of the second charging circuit 40 to output a charging voltage equal to the second requested voltage to charge the second device to be charged. At this time, the controller 10 controls the bypass circuit 41 of the second channel of the second charging circuit 40 to be turned off. It should be noted that the first device to be charged, which is electrically connected to the charging port 34 (Port1) of the first channel, determines the charging voltage output by the flyback circuit 20. Since one end of the multiple charging circuits is connected in parallel to the power output terminal 20c of the same flyback circuit 20, the second requested voltage of the second charging circuit 40 must be equal to the first requested voltage in order to open the bypass circuit 41 of the second channel, otherwise, the second device to be charged cannot be charged with the second requested voltage.

[0089] In some embodiments, please refer to Figure 6 Step S102 includes:

[0090] S201, determine whether the preset output voltage of the flyback circuit 20 is equal to the first requested voltage;

[0091] In this embodiment, the preset output voltage (typically 25V) of the flyback circuit 20 is used to connect the first voltage converter 32 so that the first voltage converter 32 outputs a preset charging voltage, enabling communication between the first protocol chip 33 and the first device to be charged. When the controller 10 obtains the first requested voltage, it needs to compare the first requested voltage with the preset output voltage of the flyback circuit to determine whether the preset output voltage of the flyback circuit needs to be adjusted.

[0092] S202, when they are equal, the preset output voltage is used as the charging voltage output;

[0093] In this embodiment, when the preset output voltage is equal to the first requested voltage, there is no need to adjust the preset output voltage of the flyback circuit. The preset output voltage can be directly output as the charging voltage to the first charging device, thereby simplifying the charging process.

[0094] S203, when they are not equal, adjust the preset output voltage to be equal to the first requested voltage and output it.

[0095] In this embodiment, when the preset output voltage is not equal to the first requested voltage, the controller 10 controls the flyback circuit 20 to adjust the preset output voltage to a charging voltage equal to the first requested voltage and output it, so as to charge the first device to be charged.

[0096] In some embodiments, please refer to Figure 7 Before step S101, the following steps are included:

[0097] S107, control the flyback circuit 20 to output a preset output voltage, and control the voltage converter 32 of the first path to turn off and the control bypass circuit 31 of the first path to turn off;

[0098] Specifically, when no device is connected to the first charging port 34, the controller 10 controls the voltage converter 32 of the first channel to turn off and the bypass circuit 31 of the first channel to turn off, so the first charging circuit 30 does not need to be powered on.

[0099] S108, upon receiving a connection signal from the protocol chip 33 of the first channel of the first charging circuit 30, the voltage converter 32 of the first channel is controlled to turn on and output a preset charging voltage, and the protocol chip 33 of the first channel is controlled to broadcast a message; wherein, the message includes a plurality of preset candidate charging voltages, the device to be charged confirms that it is connected to the protocol chip 33 of the first channel according to the preset charging voltage and receives the message, selects one charging voltage from the plurality of candidate charging voltages in the message as the first requested voltage, and sends the first requested voltage to the protocol chip 33 of the first channel so that the protocol chip 33 of the first channel can forward the first requested voltage.

[0100] Specifically, please refer to Figure 7 When the first charging port 34 (Port1) is connected to the first device to be charged, the first protocol chip 33 sends a connection signal to the controller 10. The controller 10 controls the voltage converter 32 of the first channel to output a preset charging voltage (e.g., 5V) to the charging port 34 (Port1) of the first channel to achieve electrical connection with the first device to be charged. At the same time, the controller 10 controls the first protocol chip 33 of the first channel to broadcast a message, which includes a variety of preset charging voltages. The first device to be charged confirms that the first protocol chip 33 of the first channel is in a connected state according to the preset charging voltage and selects one of the preset charging voltages as the first request voltage. The first request voltage is sent to the first protocol chip 33 of the first channel so that the first protocol chip 33 of the first channel can forward the first request voltage to the controller 10. The controller 10 obtains the first request voltage of the first device to be charged and controls the output of the flyback circuit 20 to be equal to the first request voltage.

[0101] Thirdly, this application provides a charger that includes the aforementioned charging control circuit or performs the steps of the aforementioned charging control method. Those skilled in the art can understand the charger provided by this application in conjunction with the description of the charging control circuit or charging control method described above, and further details are omitted here.

[0102] Based on the above description, the charger can provide two or more charging circuits to allow two or more devices to be charged to connect.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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 device or element 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.

[0108] 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, The charging control circuit includes: Controller; A flyback circuit, connected to the controller, is used to convert the voltage of the power supply into the charging voltage required by the device to be charged, so as to charge the device to be charged. A multi-channel charging circuit is connected to the flyback circuit to deliver the charging voltage output by the flyback circuit to the device to be charged. Each charging circuit includes a bypass circuit, a voltage converter, a protocol chip, and a charging port. The device to be charged is connected to the charging port. The flyback circuit has two outputs. The first output is electrically connected to the charging port through the bypass circuit, and the bypass circuit is electrically connected to the controller, so that the controller can control the opening and closing of the bypass circuit. The second output is electrically connected to the charging port through the voltage converter and the protocol chip, and the voltage converter is electrically connected to the controller, so that the controller can control whether the voltage converter is turned on. The protocol chip is connected to the controller. The protocol chip is used to communicate with the device to be charged to determine the requested voltage of the device to be charged and to send the requested voltage signal to the controller. The controller controls the flyback circuit to output a charging voltage equal to the requested voltage, and at the same time controls the bypass circuit to be turned on and keeps the voltage converter on, so that the charging voltage is delivered to the device to be charged through the bypass circuit, and controls the voltage converter to be turned off after a preset time.

2. The charging control circuit as described in claim 1, characterized in that, The bypass circuit is a semiconductor switching device, which is provided with a bypass control terminal connected to the controller, a bypass input terminal connected to the output terminal of the flyback circuit, and a bypass output terminal connected to the charging port. When the flyback circuit outputs a charging voltage equal to the requested voltage, the controller controls the semiconductor switching device to turn on, and the charging voltage is delivered to the device to be charged through the semiconductor switching device.

3. The charging control circuit as described in claim 1 or 2, characterized in that, The flyback circuit includes: A rectifier circuit, connected to the power supply, is used to convert the AC signal input from the power supply into a DC signal; A transformer, connected to the rectifier circuit and the multi-channel charging circuit, is used to convert the DC signal into a charging voltage equal to the requested voltage.

4. The charging control circuit as described in claim 3, characterized in that, The transformer includes a primary winding and a secondary winding coupled to the primary winding. A switching transistor and a capacitor are connected in series in the secondary winding. The switching transistor is used to control the storage and release of energy by the capacitor; or... The transformer includes a primary winding and a secondary winding coupled to the primary winding. The secondary winding is connected in series with a diode and a capacitor. The diode is used to control the storage and release of energy by the capacitor.

5. 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 to 4, and the charging control method includes: Receive the first request voltage sent by the protocol chip of the first channel of the first charging circuit; Control the flyback circuit to output a charging voltage equal to the first requested voltage; The bypass circuit of the first path is turned on to output the charging voltage through the bypass circuit of the first path, and the voltage converter of the first path is turned off after a first preset time.

6. The charging control method as described in claim 5, characterized in that, After the steps of controlling the bypass circuit of the first path to conduct so as to output the charging voltage through the bypass circuit of the first path, and controlling the voltage converter of the first path to turn off after a first preset time, the method further includes: Upon receiving a second request voltage from the protocol chip of the second charging circuit, determine whether the second request voltage is equal to the first request voltage; When the values ​​are equal, the bypass circuit of the second path of the second charging circuit is turned on, and the voltage converter of the second charging circuit is turned off after a second preset time. When the voltages are unequal, the voltage converter of the second charging circuit remains on and outputs a charging voltage equal to the second requested voltage, while the bypass circuit of the second charging circuit remains off.

7. The charging control method as described in claim 5, characterized in that, The step of controlling the flyback circuit to output a charging voltage equal to the first requested voltage includes: Determine whether the preset output voltage of the flyback circuit is equal to the first requested voltage; When the values ​​are equal, the preset output voltage is used as the charging voltage output. If they are not equal, the preset output voltage is adjusted to be equal to the first requested voltage and then output.

8. The charging control method according to any one of claims 5 to 7, characterized in that, Before the step of receiving the first requested voltage sent by the protocol chip of the first channel of the first channel of the charging circuit, the following steps are included: Control the flyback circuit to output a preset output voltage, and control the voltage converter of the first path to turn off and the bypass circuit of the first path to turn off; Upon receiving a connection signal from the protocol chip of the first channel of the first charging circuit, the device controls the voltage converter of the first channel to turn on and output a preset charging voltage, and controls the protocol chip of the first channel to broadcast a message; wherein, the message includes a plurality of preset candidate charging voltages, the device to be charged confirms that it is connected to the protocol chip of the first channel according to the preset charging voltage and receives the message, selects one charging voltage from the plurality of candidate charging voltages in the message as the first requested voltage, and sends the first requested voltage to the protocol chip of the first channel so that the protocol chip of the first channel can forward the first requested voltage.

9. A charger, characterized in that, The charger includes the charging control circuit as described in any one of claims 1 to 4, or performs the steps of the method as described in any one of claims 5 to 8.

10. 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 5 to 8.

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