Multi-port charging circuit and charger

Abstract

This application discloses a multi-port charging circuit and charger. The circuit includes m charging ports, m converters, m current sampling modules, and (m... 2 The system comprises 2 first switches, m voltage feedback modules, and a control module. Each current sampling module detects the output current of the converter and sends a current feedback signal to the control module. The control module controls the on / off state of the first switches when a device to be charged is inserted into the target charging port, enabling one-to-one single-device power supply and / or multiple-to-one parallel power supply to the target charging port. By connecting m converters in a mixed configuration, efficient and flexible mixed-connection fast charging is achieved for the devices to be charged. This eliminates the need for two-stage power conversion and requires each converter to meet the maximum power of the charging port, maximizing the utilization of converter specifications, reducing circuit costs, and improving charging efficiency.

Description

Technical Field

[0001] This application relates to the field of integrated circuit technology, and in particular to a multi-port charging circuit and charger. Background Technology

[0002] With the widespread use of terminal devices in people's work and life, people's demand for charging multiple devices at the same time is also increasing, and multi-port fast charging solutions are gradually becoming the mainstream.

[0003] The most mainstream multi-port charger solution currently on the market uses an AC / DC converter to output a fixed DC voltage in the front stage, and then employs multiple DC / DC converters in the rear stage, along with at least one fast charging protocol chip, to achieve fast charging from multiple charging ports. However, using two stages of power conversion to achieve multi-port fast charging results in low charging efficiency and high circuit costs. Furthermore, typically one converter corresponds to one charging port, and each converter's specifications must meet the maximum power output of the charging port, which also increases circuit costs. Moreover, when multiple charging ports are simultaneously plugged in by devices, each port cannot reach its maximum power output, leading to underutilization of converter specifications and redundant waste. Summary of the Invention

[0004] This application provides a multi-port charging circuit and charger to solve the problems of low charging efficiency, high circuit cost, and redundant waste of converters when using two-stage power conversion to achieve multi-port fast charging.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, this application provides a multi-port charging circuit, including m charging ports, m converters, m current sampling modules, and (m... 2 + m) / 2 first switches, m voltage feedback modules and control modules, where m is an integer greater than or equal to 2;

[0007] Each of the converters is connected to a charging port via a charging branch; each charging branch includes a current sampling module and a first switch, and every two charging branches are connected via a first switch; m converters are connected to m voltage feedback modules in a one-to-one correspondence.

[0008] Each of the current sampling modules is used to detect the output current of the converter and send a current feedback signal to the control module;

[0009] The control module is connected to each of the charging ports, each of the first switches, each of the current sampling modules, and each of the voltage feedback modules, respectively. It is used to control the opening and closing of the first switches when a device to be charged is inserted into the target charging port, so as to provide one-to-one single-device power supply and / or multiple-to-one parallel power supply to the target charging port.

[0010] In one possible implementation, when at least two of the m converters have different operating power, a second switch is also provided on each target charging branch, and each second switch is connected to the control module.

[0011] The target charging branch is the charging branch connected to the other converters among the m converters, excluding the converter with the highest operating power.

[0012] In one possible implementation, when there are n target charging ports, the control module is used to:

[0013] Based on the preset power of n target charging ports and the operating power of m converters, control (m 2 + m) / 2 of the first switches and m-1 of the second switches are switched on and off to enable the n converters whose operating power is sorted from largest to smallest to supply power to the n target charging ports individually; where n is an integer greater than or equal to 1 and less than or equal to m;

[0014] When the n converters supply power to the n target charging ports, voltage adjustment signals are sent to the voltage feedback modules corresponding to the n converters based on the current feedback signals of the n converters, so that the voltage feedback modules adjust the output current of the n converters respectively, so that the n converters can output constant current.

[0015] In one possible implementation, when n is less than m, the control module is further configured to:

[0016] The control module is further configured to select p parallel charging ports from the n target charging ports, and when the n converters supply power to the n target charging ports individually, if the power supply parameters of the p parallel charging ports meet the preset parallel conditions, control (m 2 + m) / 2 of the first switches and m-1 of the second switches are switched on and off to enable m-n+p of the converters to supply power to p of the parallel charging ports in parallel; p is an integer greater than or equal to 1 and less than or equal to n;

[0017] When m-n+p converters supply power to p parallel charging ports, voltage adjustment signals are sent to the voltage feedback modules corresponding to m-n+p converters based on the current feedback signals of the m-n+p converters. This causes the voltage feedback modules to adjust the output current of the m-n+p converters, so that the output currents of the m-n+p converters maintain a preset proportional relationship, and / or the sum of the output currents of the m-n+p converters remains constant.

[0018] In one possible implementation, when m=2, the multi-port charging circuit includes a first charging port, a second charging port, a first converter, a second converter, a first current sampling module, a second current sampling module, three first switches, a first voltage feedback module, a second voltage feedback module, and the control module.

[0019] The first current sampling module has a first end connected to the output end of the first converter and a second end connected to the first charging port via a first switch; the second current sampling module has a first end connected to the output end of the second converter and a second end connected to the second charging port via a first switch; the second end of the first current sampling module and the second end of the second current sampling module are connected via a first switch.

[0020] The first voltage feedback module has a first terminal connected to the output terminal of the first converter, a second terminal connected to the feedback terminal of the first converter, and a third terminal connected to the control module; the second voltage feedback module has a first terminal connected to the output terminal of the second converter, a second terminal connected to the feedback terminal of the second converter, and a third terminal connected to the control module.

[0021] The first charging port, the second charging port, each of the first switches, the output terminal of the first current sampling module, and the output terminal of the second current sampling module are all connected to the control module.

[0022] In one possible implementation, when the target charging port includes both the first charging port and the second charging port, the control module is configured to:

[0023] Control the on / off state of the three first switches to enable the first converter to supply power to the first charging port and enable the second converter to supply power to the second charging port.

[0024] Based on the first current feedback signal sent by the first current sampling module, a first voltage adjustment signal is output to the first voltage feedback module, so that the first voltage feedback module adjusts the output current of the first converter, so that the first converter can perform constant current output.

[0025] Based on the second current feedback signal sent by the second current sampling module, a second voltage adjustment signal is output to the second voltage feedback module, so that the second voltage feedback module adjusts the output current of the second converter, so that the second converter can perform constant current output.

[0026] In one possible implementation, when the target charging port is either the first charging port or the second charging port, and the operating power of the first converter is greater than the operating power of the second converter, the control module is configured to:

[0027] Controlling the on / off state of the three first switches enables the first converter to supply power to the target charging port, and based on the first current feedback signal sent by the first current sampling module, outputting a first voltage adjustment signal to the first voltage feedback module, so that the first voltage feedback module adjusts the output current of the first converter, so that the first converter can output a constant current.

[0028] If the power supply parameters of the target charging port meet the preset parallel operation conditions, the first converter and the second converter are controlled to provide parallel power to the target charging port. Based on the first current feedback signal and the second current feedback signal sent by the second current sampling module, a first voltage adjustment signal is output to the first voltage feedback module, and / or a second voltage adjustment signal is output to the second voltage feedback module. This causes the first voltage feedback module to adjust the output current of the first converter, and the second voltage feedback module to adjust the output current of the second converter, so that the output current of the first converter and the output current of the second converter maintain a preset proportional relationship, and / or the sum of the output current of the first converter and the output current of the second converter remains constant.

[0029] In one possible implementation, the control module includes a first loop control circuit and a controller; the first loop control circuit includes a first operational amplifier, a first current source, a first capacitor, an amplification module, and seven third switches; each of the third switches is connected to the controller;

[0030] The non-inverting input terminal and the inverting input terminal of the first operational amplifier are respectively connected to the output terminal of the first current sampling module through two third switches; the output terminal of the second current sampling module is connected to the first terminal of the amplification module; the non-inverting input terminal and the inverting input terminal of the first operational amplifier are respectively connected to the second terminal of the amplification module through two third switches; the inverting input terminal of the first operational amplifier is connected to the first current feedback reference through one of the third switches.

[0031] The first current source has its first terminal connected to the first power supply, its first control terminal connected to the output terminal of the first operational amplifier and the first terminal of the first capacitor, and its second control terminal connected to the second terminal of the first capacitor; the second terminal of the first capacitor is grounded; the third terminals of the first voltage feedback module and the second voltage feedback module are respectively connected to the second terminal of the first current source through two third switches.

[0032] In one possible implementation, the control module further includes a second loop control circuit; the second loop control circuit includes a second operational amplifier, a second current source, a third current source, a second capacitor, an adder, and four fourth switches; each of the fourth switches is connected to the controller;

[0033] The output terminal of the first current sampling module is connected to the first terminal of the adder, and the output terminal of the second current sampling module is connected to the second terminal of the adder; the output terminal of the adder is connected to the non-inverting input terminal of the second operational amplifier through a fourth switch; the output terminal of the second current sampling module is also connected to the non-inverting input terminal of the second operational amplifier through a fourth switch; the inverting input terminal of the first operational amplifier is connected to the second current feedback reference.

[0034] The second current source has its first terminal connected to the second power supply, its first control terminal connected to the output terminal of the second operational amplifier and the first terminal of the second capacitor, and its second control terminal connected to the second terminal of the second capacitor; the second terminal of the second capacitor is grounded; the third current source has its first terminal connected to the third power supply, its first control terminal connected to the output terminal of the second operational amplifier, and its second control terminal grounded;

[0035] The third terminal of the first voltage feedback module is connected to the second terminal of the second current source through a fourth switch, and the fourth terminal of the second voltage feedback module is connected to the second terminal of the third current source through a fourth switch.

[0036] Secondly, this application provides a charger that includes the multi-port charging circuit described in any one of the first aspects above.

[0037] The multi-port charging circuit provided in this application includes m charging ports, m converters, m current sampling modules, and (m... 2The system comprises two first switches, m voltage feedback modules, and a control module. Each current sampling module detects the output current of the converter and sends a current feedback signal to the control module. The control module controls the on / off state of the first switches when a device to be charged is inserted into the target charging port, enabling one-to-one single-device power supply and / or multiple-to-one parallel power supply to the target charging port. This multi-connection of m converters allows for efficient and flexible fast charging of the devices to be charged, eliminating the need for two-stage power conversion and requiring each converter to meet the maximum power of the charging port. This maximizes the utilization of converter specifications, thereby reducing circuit costs while ensuring charging efficiency. Attached Figure Description

[0038] Figure 1 This is a block diagram illustrating a multi-port charging circuit according to an exemplary embodiment;

[0039] Figure 2 This is a block diagram illustrating another multi-port charging circuit according to an exemplary embodiment;

[0040] Figure 3 It is based on Figure 1 The circuit diagram shown is of a dual-port charging circuit;

[0041] Figure 4 It is based on Figure 3 A circuit diagram of a first-loop control circuit is shown.

[0042] Figure 5 It is based on Figure 4 A circuit diagram of a second loop control circuit is shown.

[0043] Figure 6 This is a schematic diagram illustrating signal changes in a single charging port according to an exemplary embodiment;

[0044] Figure 7 This is a block diagram illustrating a charger according to an exemplary embodiment. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0046] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, the use of "based on" or "according to" implies openness and inclusiveness, because processes, steps, calculations, or other actions "based on" or "according to" one or more of the stated conditions or values ​​may in practice be based on additional conditions or beyond the stated values.

[0047] Figure 1 This is a block diagram illustrating a multi-port charging circuit according to an exemplary embodiment. Figure 1 As shown, the multi-port charging circuit 10 includes m charging ports 11, m converters 12, m current sampling modules 13, and (m... 2 + m) / 2 first switches K1, m voltage feedback modules 14 and control module 15. Where m is an integer greater than or equal to 2.

[0048] Each converter 12 is connected to a charging port 11 via a charging branch. Each charging branch includes a current sampling module 13 and a first switch K1, and every two charging branches are connected via a first switch K1. The m converters 12 are connected to the m voltage feedback modules 14 in a one-to-one correspondence.

[0049] Each voltage feedback module 14 is used to provide a voltage feedback signal to the converter 12 based on the output voltage of the converter 12, so as to adjust the output voltage of the converter 12.

[0050] Each current sampling module 13 is used to detect the output current of the converter 12 and send a current feedback signal to the control module 15, so that the control module 15 adjusts the output current of the converter 12 based on the current feedback signal through the voltage feedback module 14.

[0051] The control module 15 is connected to each charging port 11, each first switch K1, each current sampling module 13, and each voltage feedback module 14 respectively. When a device to be charged is inserted into the target charging port, the control module 15 controls the opening and closing of the first switch K1 based on the preset power of the target charging port and the operating power of the converter 12, so that at least one converter 12 can provide one-to-one single-machine power supply and / or multiple-to-one parallel power supply to the target charging port.

[0052] Specifically, the multi-port charging circuit 10 adopts a series-parallel hybrid topology. After the multi-port charging circuit 10 is powered on, the control module 15 continuously detects whether any device to be charged is inserted into any of the m charging ports 11. If at least one charging port 11 is detected to have a device to be charged inserted, the control module 15 determines the charging port with the inserted device as the target charging port, and selects which converters 12 will supply power to the target charging port and the power supply method for the target charging port based on the preset power of each target charging port, the operating power of each converter 12, and the preset power supply strategy.

[0053] The preset power of the target charging port is the maximum power that the target charging port can provide to the device to be charged, and the operating power of the converter 12 is the power output by the converter 12 when supplying power to the charging port 11. The preset power supply strategy can be set according to actual needs, such as maximizing charging efficiency or prioritizing charging ports. There are three power supply methods: single-device power supply to the target charging port only, parallel power supply to the target charging port only, and simultaneous single-device and parallel power supply to the target charging port (i.e., single-device power supply to some target charging ports and parallel power supply to others).

[0054] Then, based on the selected converter 12 and power supply method, the control module 15 will send a switch control signal to each of the first switches K1 in a one-to-one correspondence (the switch control signal corresponding to the first switch K1 is represented by LSG1 to LSG(m)). 2 (represented by + m) / 2) to control the opening or closing of each first switch K1, so that the selected converter 12 can provide single-machine power supply and / or parallel power supply to the target charging port, thereby realizing efficient and flexible hybrid fast charging of the device to be charged.

[0055] Furthermore, during the power supply process, for each converter 12 supplying power to the target charging port, the control module 15 can, based on the received current feedback signal (in... Figure 1 (represented by VIFB1-VIFBm), determine the current difference between each charging branch, and then generate the voltage adjustment signal corresponding to each converter 12 based on the current difference (in Figure 1The voltage adjustment signals are represented by VFB1-VFBm (e.g., current sinking signals) and sent to the voltage feedback module 14 corresponding to each converter 12. The voltage feedback module 14 adjusts the output voltage of each converter 12 based on the voltage adjustment signals, thereby adjusting the output current of each converter 12. This achieves at least one of the following: each converter 12 maintains a constant current output; the output currents of each converter 12 maintain a preset ratio (i.e., current is distributed according to demand, for example, current sharing can be achieved when the preset ratio is 1:1:...:1); and the sum of the output currents of each converter 12 remains constant (i.e., total constant current is achieved).

[0056] In addition, during power supply, each voltage feedback module 14 continuously monitors the output voltage of its corresponding converter 12 and generates a voltage feedback signal, which is provided to the constant voltage loop of its corresponding converter 12. This allows each converter 12, which is currently being powered, to adjust its output voltage based on the received voltage feedback signal and the voltage feedback reference to achieve constant voltage output. The voltage feedback reference for each converter 12 can be provided by the control module 15.

[0057] The multi-port charging circuit provided in this application achieves efficient and flexible fast charging of the device to be charged through the mixed connection of m converters. It eliminates the need for two-stage power conversion and does not require each converter to meet the maximum power of the charging port, maximizing the utilization of converter specifications and thus reducing circuit costs while ensuring charging efficiency. Furthermore, during fast charging, it can achieve constant voltage and constant current output regulation for each converter individually, allocate the output current of each converter according to demand, and achieve overall constant current control when multiple charging branches work together.

[0058] In some embodiments, when at least two of the m converters 12 have different operating power, a second switch K2 is also provided on each target charging branch, and each second switch K2 is connected to the control module 15.

[0059] Among them, the target charging branch is the charging branch connected to the other converters among the m converters 12, excluding the converter with the highest operating power.

[0060] Specifically, if at least two of the m converters 12 have different operating power, then at least two of the m converters 12 will have different output voltages. This may cause the high-voltage charging branch to crosstalk the low-voltage charging branch. Therefore, in order to effectively prevent the high-voltage charging branch from crosstalking the low-voltage charging branch and ensure the stable operation of single-unit power supply and parallel power supply, a second switch K2 can be set on each target charging branch. The second switch K2 is a switch that can provide bidirectional voltage isolation when turned off; for example, the second switch K2 can be a back-to-back transistor.

[0061] Let's take m = 3 as an example for explanation. (Refer to...) Figure 2 The multi-port charging circuit 10 includes three charging ports 11 (with preset power of 100W, 45W and 20W respectively), three converters 12 (with working power of 65W, 45W and 35W respectively), three current sampling modules 13, six first switches K1, two second switches K2, three voltage feedback modules 14 and a control module 15.

[0062] Two second switches K2 are respectively installed on the charging branches connected to the 45W converter 12 and the 35W converter 12. The control module 15 can send switch control signals to the two second switches K2 one-to-one (in... Figure 2 The switch control signals corresponding to the second switch K2 are represented by DRV1 and DRV2, which control the two second switches K2 to be turned on or off.

[0063] It should be noted that, Figure 2 This is merely an illustrative example of the multi-port charging circuit 10. This disclosure does not specifically limit the number of charging ports or converters. Those skilled in the art can configure it according to specific usage scenarios.

[0064] In one possible implementation, when there are n target charging ports, the control module 15 is used to:

[0065] Based on the preset power of n target charging ports and the operating power of m converters 12, control (m 2 The switching of the first switch K1 (+m) / 2 and the second switch K2 (m-1) allows the n converters 12, ordered by their operating power from largest to smallest, to supply power to the n target charging ports individually. Here, n is an integer greater than or equal to 1 and less than or equal to m.

[0066] When n converters 12 supply power to n target charging ports individually (i.e., when the n converters 12 with the highest operating power supply power to n target charging ports individually), based on the current feedback signals corresponding to the n converters 12, voltage adjustment signals are sent to the voltage feedback modules 14 corresponding to the n converters 12 respectively, so that the n voltage feedback modules 14 adjust the output current of the n converters 12 respectively, so that the n converters 12 can output constant current.

[0067] The following is Figure 2 The power supply process of the converter will be explained in detail using an example:

[0068] If three devices are plugged into three charging ports 11 (i.e., n = 3), then all three charging ports 11 are target charging ports. Since the number of converters 12 is the same as the number of target charging ports, based on the preset power supply strategy of maximizing charging efficiency, the control module 15 will select the three converters 12 to provide one-to-one single-device power to the three target charging ports respectively.

[0069] Specifically, the control module 15 sets LSG1 = LSG2 = LSG3 = DRV1 = DRV2 = ON and LSG4 = LSG5 = LSG6 = OFF to control the first switch K1 corresponding to LSG1, LSG2, and LSG3 to be turned on, control the second switch K2 corresponding to DRV1 and DRV2 to be turned on, and control the first switch K1 corresponding to LSG4, LSG5, and LSG6 to be turned off. In this way, the 65W converter 12 will supply power to the 100W charging port 11, the 45W converter 12 will supply power to the 45W charging port 11, and the 35W converter 12 will supply power to the 20W charging port 11.

[0070] During single-unit power supply, each current sampling module 13 generates a current feedback signal (VIFB1 - VIFB3) corresponding to each converter 12 based on the detected output current of the converter 12 and feeds it back to the control module 15. The control module 15 generates a voltage adjustment signal (VFB1 - VFB3) corresponding to each converter 12 based on the received current feedback signal and the pre-set reference feedback current of each converter 12, and sends it to the voltage feedback module 14 corresponding to each converter 12 respectively, so that each voltage feedback module 14 adjusts the output voltage of each converter 12 based on the voltage adjustment signal, thereby adjusting the output current of each converter 12 so that each converter 12 maintains a constant current output.

[0071] In another possible implementation, when n is less than m, the control module 15 is also used for:

[0072] The control module 15 is also used to select p parallel charging ports from n target charging ports, and when n converters 12 supply power to n target charging ports individually, if the power supply parameters of the p parallel charging ports meet the preset parallel conditions, control (m 2 The switching of the first switch K1 (+ m) / 2 and the second switch K2 (m-1) enables m-n+p converters 12 to supply power to p parallel charging ports in parallel operation (i.e., based on the original p converters 12 supplying power to p parallel charging ports individually, the idle mn converters 12 are used in conjunction with the original p converters 12 to jointly supply power to p parallel charging ports). p is an integer greater than or equal to 1 and less than or equal to n.

[0073] When m-n+p converters 12 supply power to p parallel charging ports (at this time, np target charging ports other than p parallel charging ports can still be in single-machine power supply state), based on the current feedback signals corresponding to m-n+p converters 12, voltage adjustment signals are sent to the voltage feedback modules 14 corresponding to m-n+p converters 12 respectively, so that the m-n+p voltage feedback modules 14 adjust the output current of m-n+p converters 12, so that the output currents of m-n+p converters 12 maintain a preset proportional relationship, and / or keep the sum of the output currents of m-n+p converters 12 constant.

[0074] The following will still be in the format of Figure 2 The power supply process of the converter will be explained in detail using an example:

[0075] If there are two devices to be charged, plugged into the 100W charging port 11 and the 45W charging port 11 respectively (i.e., n = 2), then the 100W charging port 11 and the 45W charging port 11 are the target charging ports.

[0076] Since the number of converters 12 is greater than the number of target charging ports (i.e., n < m), based on the preset power supply strategy to maximize charging efficiency, the control module 15 will first select the converter 12 with the largest working power (i.e., 65W converter 12) to provide one-to-one single-machine power to the 100W charging port 11, and select the converter 12 with the second largest working power (i.e., 45W converter 12) to provide one-to-one single-machine power to the 45W charging port 11.

[0077] Specifically, the control module 15 will set LSG1 = LSG2 = DRV1 = ON, LSG3 = LSG4 = LSG5 = LSG6 = DRV2 = OFF, so that the 65W converter 12 will supply power to the 100W target charging port and the 45W converter 12 will supply power to the 45W target charging port.

[0078] Furthermore, to avoid the 35W converter 12 being idle and to improve power supply efficiency, the control module 15 will also select the 100W charging port 11 as a parallel charging port (i.e., p = 1), so that the 35W converter 12 and the 65W converter 12 can work together to provide parallel power to the 100W charging port 11. The 100W charging port 11 is chosen as the parallel charging port because the 65W converter 12 alone cannot meet the power supply requirements of the 100W charging port 11; an additional converter 12 is needed to jointly supply power to the 100W charging port 11.

[0079] Specifically, during the process of the 65W converter 12 supplying power to the 100W charging port 11, if the control module 15 detects that the power supply parameters of the 100W charging port 11 meet the preset parallel operation conditions, the control module 15 will set LSG1 = LSG2 = LSG6 = DRV1 = DRV2 = ON, LSG3 = LSG4 = LSG5 = OFF. In this way, the 65W converter 12 and the 35W converter 12 will jointly supply power to the 100W charging port 11 in parallel operation, while the 45W converter 12 will still supply power to the 45W charging port 11 alone.

[0080] The power supply parameters of charging port 11 include at least one of the following: the actual output power of charging port 11, the output current of the converter supplying power to charging port 11, and the output voltage of the converter supplying power to charging port 11. It should be noted that when the power supply parameters of charging port 11 include the output voltage of the converter, the output terminal of each converter 12 (in...) Figure 2 (VIN1 - VIN3 are used to represent them) All of them need to be connected to the control module 15.

[0081] Whether the power supply parameters of the charging port meet the preset parallel operation conditions includes at least one of the following:

[0082] (1) The ratio of the actual output power of the charging port to the working power of the converter supplying power to the charging port is greater than a preset ratio threshold (the preset ratio threshold may be, for example, 80%).

[0083] (2) The output current of the converter supplying power to the charging port is greater than the preset current threshold;

[0084] (3) The output voltage of the converter supplying power to the charging port is less than (or can be greater, depending on the control strategy of the circuit) the output voltage of the converter that will supply power to the charging port. For example, the 65W converter 12 first supplies power to the 100W target charging port. Only when the output voltage of the 65W converter 12 (i.e., VIN1) is less than the output voltage of the 35W converter 12 (i.e., VIN3) can the 35W converter 12 supply power to the 100W charging port 11 in parallel with the 65W converter 12.

[0085] During parallel power supply, each current sampling module 13 generates a current feedback signal (VIFB1 - VIFB3) corresponding to each converter 12 based on the detected output current of the converter 12, and feeds it back to the control module 15.

[0086] The control module 15 generates a voltage adjustment signal VFB2 corresponding to the 45W converter 12 based on the current feedback signal corresponding to the 45W converter 12 and the preset reference feedback current of the 45W converter 12. The signal VFB2 is then sent to the voltage feedback module 14 corresponding to the 45W converter 12, so that the voltage feedback module 14 corresponding to the 45W converter 12 adjusts the output voltage of the 45W converter 12 based on the voltage adjustment signal, thereby adjusting the output current of the 45W converter 12 so that the 45W converter 12 maintains a constant current output.

[0087] Simultaneously, the control module 15 generates voltage adjustment signals VFB1 and VFB3 for the 65W converter 12 based on the current feedback signals VIFB1 and VIFB3 for the 35W converter 12, combined with a preset proportional relationship between the output currents of the different converters 12 and / or a preset total constant current value. These signals are then sent to the corresponding voltage feedback modules 14. The voltage feedback modules 14 for the 65W and 35W converters adjust the output currents of the 65W and 35W converters respectively based on their received voltage adjustment signals, ensuring that the output currents of the 65W and 35W converters maintain a preset proportional relationship and / or that the sum of the output currents of the 65W and 35W converters remains at the total constant current value.

[0088] In some embodiments, such as Figure 3 As shown, when m=2, the multi-port charging circuit 10 includes a first charging port 111, a second charging port 112, a first converter 121, a second converter 122, a first current sampling module 131, a second current sampling module 132, three first switches K1, a first voltage feedback module 141, a second voltage feedback module 142, and a control module 15.

[0089] The first current sampling module 131 has its first terminal connected to the output terminal of the first converter 121, and its second terminal connected to the first charging port 111 via a first switch K1. The second current sampling module 132 has its first terminal connected to the output terminal of the second converter 122, and its second terminal connected to the second charging port 112 via a first switch K1. The second terminals of the first current sampling module 131 and the second current sampling module 132 are connected via a first switch K1.

[0090] The first voltage feedback module 141 has a first terminal connected to the output terminal of the first converter 121, a second terminal connected to the feedback terminal of the first converter 121, and a third terminal connected to the control module 15. The second voltage feedback module 142 has a first terminal connected to the output terminal of the second converter 122, a second terminal connected to the feedback terminal of the second converter 122, and a third terminal connected to the control module 15.

[0091] The first charging port 111, the second charging port 112, each first switch K1, the output terminal of the first current sampling module 131, and the output terminal of the second current sampling module 132 are all connected to the control module 15.

[0092] In some embodiments, the first converter 121 and the second converter 122 may be AC-DC converters or DC-DC converters.

[0093] In some embodiments, the first current sampling module 131 includes a first current detection amplifier CSA1 and a first sampling resistor Rs1, wherein the first sampling resistor Rs1 is connected in series between the first converter 121 and the first switch K1. The two input terminals of the first current detection amplifier CSA1 are respectively connected to the two ends of the first sampling resistor Rs1, and the output terminal of the first current detection amplifier CSA1 is connected to the control module 15.

[0094] The second current sampling module 132 includes a second current detection amplifier CSA2 and a second sampling resistor Rs2, which is connected in series between the second converter 122 and the second switch K2. The two input terminals of the second current detection amplifier CSA2 are respectively connected to the two ends of the second sampling resistor Rs2, and the output terminal of the second current detection amplifier CSA2 is connected to the control module 15.

[0095] In some embodiments, the first switch K1 connected to the first charging port 111 is a transistor S1, controlled by LSG1. The first switch K1 connected to the second charging port 112 is a transistor S2, controlled by LSG2. The first switch K1 connected between the two charging branches is a back-to-back transistor S3 and S4, both of which are controlled by LSG3.

[0096] In some embodiments, the first voltage feedback module 141 includes a first resistor R1 and a second resistor R2. The output terminal of the first converter 121 is grounded sequentially through the first resistor R1 and the second resistor R2. The feedback terminal of the first converter 121 and the control module 15 are respectively connected between the first resistor R1 and the second resistor R2 (in this case, the second and third terminals of the first voltage feedback module 141 are the same terminal). The second voltage feedback module 142 includes a third resistor R3 and a fourth resistor R4. The output terminal of the second converter 122 is grounded sequentially through the third resistor R3 and the fourth resistor R4. The feedback terminal of the second converter 122 and the control module 15 are respectively connected between the third resistor R3 and the fourth resistor R4 (in this case, the second and third terminals of the second voltage feedback module 142 are the same terminal).

[0097] In some embodiments, if the operating power of the first converter 121 is different from that of the second converter 122, the multi-port charging circuit 10 may further include a second switch K2. The second switch K2 may be a back-to-back transistor S5 and S6, both controlled by DRV1.

[0098] In one possible implementation, where the target charging port includes a first charging port 111 and a second charging port 112, the control module 15 is configured to:

[0099] Control the on / off state of the three first switches K1 so that the first converter 121 supplies power to the first charging port 111 and the second converter 122 supplies power to the second charging port 112.

[0100] Based on the first current feedback signal sent by the first current sampling module 131, a first voltage adjustment signal is output to the first voltage feedback module 141, so that the first voltage feedback module 141 adjusts the output current of the first converter 121 so that the first converter 121 performs constant current output.

[0101] Based on the second current feedback signal sent by the second current sampling module 132, a second voltage adjustment signal is output to the second voltage feedback module 142, so that the second voltage feedback module 142 adjusts the output current of the second converter 122 so that the second converter 122 performs constant current output.

[0102] Specifically, when two devices to be charged are plugged into the first charging port 111 and the second charging port 112 respectively, the first charging port 111 and the second charging port 112 operate simultaneously. At this time, both the first charging port 111 and the second charging port 112 are target charging ports. Since the number of converters is the same as the number of target charging ports, based on the preset power supply strategy to maximize charging efficiency, the control module 15 will set LSG1 = LSG2 = DRV1 = ON and LSG3 = OFF, so that the first converter 121 supplies power to the first charging port 111 and the second converter 122 supplies power to the second charging port 112.

[0103] During the process of the first converter 121 and the second converter 122 supplying power to the first charging port 111 and the second charging port 112 respectively, the first current detection amplifier CSA1 will detect and amplify Io1 (i.e., the output current of the first converter 121) at the first sampling resistor R. s1 The voltage formed at both ends generates VIFB1 and is sent to the control module 15, where VIFB1 = Io1 * R s1 * CSA1. The second current-sensing amplifier CSA2 detects and amplifies Io2 (i.e., the output current of the first converter 121) at the second sampling resistor R. s2 The voltage formed at both ends generates VIFB2 and is sent to the control module 15, where VIFB2 = Io2 * R s2 * CSA2.

[0104] The control module 15 generates VFB1 corresponding to the first converter 121 based on VIFB1 and a pre-set reference feedback current of the first converter 121, and sends it to the first voltage feedback module 141. The first voltage feedback module 141 adjusts Io1 by adjusting VIN1 based on VFB1 to maintain a constant current output of the first converter 121. The control module 15 generates VFB2 corresponding to the second converter 122 based on VIFB2 and a pre-set reference feedback current of the second converter 122, and sends it to the second voltage feedback module 142. The second voltage feedback module 142 adjusts Io2 by adjusting VIN2 based on VFB2 to maintain a constant current output of the second converter 122.

[0105] In another possible implementation, when the target charging port is either the first charging port 111 or the second charging port 112, and the operating power of the first converter 121 is greater than the operating power of the second converter 122, the control module 15 is used to:

[0106] The three first switches K1 are controlled to open and close, so that the first converter 121 supplies power to the target charging port. Based on the first current feedback signal sent by the first current sampling module 131, the first voltage adjustment signal is output to the first voltage feedback module 141, so that the first voltage feedback module 141 adjusts the output current of the first converter 121, so that the first converter 121 performs constant current output.

[0107] If the power supply parameters of the target charging port meet the preset parallel operation conditions, the first converter 121 and the second converter 122 are controlled to provide parallel power to the target charging port. Based on the first current feedback signal and the second current feedback signal sent by the second current sampling module 132, a first voltage adjustment signal is output to the first voltage feedback module 141, and / or a second voltage adjustment signal is output to the second voltage feedback module 142. This causes the first voltage feedback module 141 to adjust the output current of the first converter 121, and the second voltage feedback module 142 to adjust the output current of the second converter 122, so that the output current of the first converter 121 and the output current of the second converter 122 maintain a preset proportional relationship, and / or the sum of the output current of the first converter 121 and the output current of the second converter 122 remains constant.

[0108] Specifically, when the operating power P1 of the first converter 121 is greater than the operating power P2 of the second converter 122, the preset power (i.e., full-load output power) Po1 when plugged into the first charging port 111 alone is equal to P1 + P2, and the preset power (i.e., full-load output power) Po2 when plugged into the second charging port 112 alone is equal to P1 + P2. The circuit working principle is as follows:

[0109] If the device to be charged is plugged into the first charging port 111 alone, when Po1 < P1, only the first converter 121 will supply power. The control module 15 will set LSG1 = LSG3 = ON and LSG2 = DRV1 = OFF, so that the first converter 121 supplies power to the first charging port 111 alone. When Po1 ≥ P1, and the first charging port 111 meets the preset parallel operation conditions, in order to avoid the second converter 122 being idle, the control module 15 will set LSG1 = LSG3 = DRV1 = ON and LSG2 = OFF, so that the first converter 121 and the second converter 122 jointly supply power to the first charging port 111 in parallel.

[0110] If the device to be charged is plugged into the second charging port 112, when Po2 < P1, based on the preset power supply strategy to maximize charging efficiency, it can be powered only by the first converter 121 with higher operating power. The control module 15 will set LSG2 = LSG3 = ON and LSG1 = DRV1 = OFF, so that the first converter 121 supplies power to the second charging port 112 alone. When Po2 ≥ P1, and the second charging port 112 meets the preset parallel operation conditions, in order to avoid the second converter 122 being idle, the control module 15 will set LSG2 = LSG3 = DRV1 = ON and LSG1 = OFF, so that the first converter 121 and the second converter 122 jointly supply power to the first charging port 111 in parallel.

[0111] By having the first converter 121 and the second converter 122 supply power to the first charging port 111 / second charging port 112 in parallel, it is possible to ensure that the first converter 121 supplies power when the single plug power is not high, thereby improving the system power supply efficiency. At the same time, when the output power exceeds the maximum operating power of the individual converter, the two converters supply power simultaneously, thereby saving the capacity and size of the converter.

[0112] Furthermore, when P1 = P2, the second switch K2 can be omitted. If the device to be charged is plugged into the second charging port 112 alone, when Po2 < P1, it can be powered only by the second converter 122. The control module 15 will set LSG2 = ON and LSG1 = LSG3 = OFF, so that the second converter 121 supplies power to the second charging port 112 alone. When Po2 ≥ P2, and the second charging port 112 meets the preset parallel operation conditions, in order to avoid the first converter 121 being idle, the control module 15 will set LSG2 = LSG3 = ON and LSG1 = OFF, so that the first converter 121 and the second converter 122 jointly supply power to the second charging port 112 in parallel.

[0113] During the parallel power supply of the first converter 121 and the second converter 122 to the first charging port 111, the control module 15 generates VFB1 and VFB2 based on the first current feedback signal and the second current feedback signal, combined with a preset ratio between Io1 and Io2, and / or a preset total constant current value, and sends them to the first voltage feedback module 141 and the second voltage feedback module 142 respectively. The first voltage feedback module 141 adjusts Io1 by adjusting VIN1 based on VFB1, and the second voltage feedback module 142 adjusts Io2 by adjusting VIN2 based on VFB2, so that the preset ratio between Io1 and Io2 is maintained, and / or the sum of Io1 and Io2 is maintained at the total constant current value.

[0114] The technical solutions in this application provide reasonable power path solutions for dual-port charging circuits, such as for typical single-port output power of 65W and dual-port simultaneous insertion of 45W+20W or 35W+30W. These solutions maximize the use of converter specifications and do not require each converter to meet the 65W power output specification, thus avoiding the problem of converter redundancy and waste.

[0115] In some embodiments, such as Figure 4 As shown, the control module 15 includes a first loop control circuit and a controller 151. The first loop control circuit includes a first operational amplifier G1, a first current source CS1, a first capacitor C1, an amplifier module A, and seven third switches (in... Figure 4 (These are represented by S1P1, S1P2, S1N1, S1N2, S1N3, Q11, and Q12, respectively). Each third switch is connected to controller 151.

[0116] The non-inverting input (G1P) and inverting input (G1N) of the first operational amplifier G1 are connected to the output of the first current sampling module 131 via two third switches (S1P1 and S1N1). The output of the second current sampling module 132 is connected to the first terminal of the amplification module A. The non-inverting and inverting inputs of the first operational amplifier G1 are connected to the second terminal of the amplification module A via two third switches (S1P2 and S1N2). The inverting input of the first operational amplifier G1 is connected to the first current feedback reference VDAC_CL1 via a third switch (S1N3).

[0117] The first current source CS1 has its first terminal connected to the first power supply V1, its first control terminal connected to the output terminal of the first operational amplifier G1 and the first terminal of the first capacitor C1, and its second control terminal connected to the second terminal of the first capacitor C1. The second terminal of the first capacitor C1 is grounded. The third terminals of the first voltage feedback module 141 and the second voltage feedback module 142 are respectively connected to the second terminal of the first current source CS1 through two third switches (Q11 and Q12).

[0118] Specifically, the first loop control circuit is connected to the first current sampling module 131, the second current sampling module 132, the first voltage feedback module 141, and the second voltage feedback module 142, forming the first current loop of the multi-port charging circuit 10. This first current loop is used to adjust Io1 and Io2 to maintain a preset ratio between Io1 and Io2, thereby achieving current distribution as needed (e.g., current sharing, i.e., Io1 = Io2). The controller 151 can control whether the first current loop is working by sending a first loop enable signal CL1_EN to the first operational amplifier G1.

[0119] VCPC1 is the voltage output by the first operational amplifier G1 after feedback. ISRC1 is obtained by controlling the first current source CS1 through VCPC1. ISRC1 is injected into the third terminal (i.e., the input terminal of VFB1) of the first voltage feedback module 141 and the third terminal (i.e., the input terminal of VFB2) of the second voltage feedback module 141 through different third switches (Q11, Q12), thereby affecting the output voltage of the first converter 121 and the output voltage of the second converter 122, and thus adjusting Io1 and Io2.

[0120] Figure 5 It is based on Figure 4 A circuit diagram of a second-loop control circuit is shown. (For example...) Figure 5 As shown, the control module 15 also includes a second loop control circuit 153. The second loop control circuit 153 includes a second operational amplifier G2, a second current source CS2, a third current source CS3, a second capacitor C2, an adder ADD, and four fourth switches (in...). Figure 5 (These are denoted as S2P1, S2P2, Q21, and Q22 respectively). Each fourth switch is connected to controller 151.

[0121] The output of the first current sampling module 131 is connected to the first terminal of the adder ADD, and the output of the second current sampling module 132 is connected to the second terminal of the adder ADD. The output of the adder ADD is connected to the non-inverting input (G2P) of the second operational amplifier G2 via a fourth switch (S2P1). The output of the second current sampling module 132 is also connected to the non-inverting input of the second operational amplifier G2 via a fourth switch (S2P2). The inverting input (G2N) of the first operational amplifier G1 is connected to the second current feedback reference VDAC_CL2.

[0122] The second current source CS2 has its first terminal connected to the second power supply V2, its first control terminal connected to the output terminal of the second operational amplifier G2 and the first terminal of the second capacitor C2, and its second control terminal connected to the second terminal of the second capacitor C2. The second terminal of the second capacitor C2 is grounded. The third current source CS3 has its first terminal connected to the third power supply V3, its first control terminal connected to the output terminal of the second operational amplifier G2, and its second control terminal grounded.

[0123] The third terminal of the first voltage feedback module 141 is connected to the second terminal of the second current source CS2 through a fourth switch (Q21), and the fourth terminal of the second voltage feedback module 142 is connected to the second terminal of the third current source CS3 through a fourth switch (Q22).

[0124] Specifically, the second loop control circuit 153 is connected to the first current sampling module 131, the second current sampling module 132, the first voltage feedback module 141, and the second voltage feedback module 142, forming the second current loop of the multi-port charging circuit 10. This second current loop is used to adjust Io1 and Io2 to keep the sum of Io1 and Io2 at a total constant current value, thereby achieving a total constant current. The controller 151 can control whether the second current loop is working by sending a second loop enable signal CL2_EN to the second operational amplifier G2.

[0125] VCPC2 is the voltage output by the second operational amplifier G2 after feedback. ISRC21 and ISRC22 are obtained by VCPC2 controlling the second current source CS2 and the third current source CS3 respectively. They are injected into the third terminal of the first voltage feedback module 141 and the third terminal of the second voltage feedback module 141 through different third switches (Q21, Q22), thereby affecting the output voltage of the first converter 121 and the output voltage of the second converter 122, and thus adjusting Io1 and Io2.

[0126] The following example uses P1>P2, combined with Figures 3-5 The working principle of the current loop of the multi-port charging circuit 10 is explained in detail below:

[0127] When P1>P2, the relationship between the charging port inserted into the device to be charged, whether the charging port meets the preset parallel operation conditions, the input signal of G1, the input signal of G2, and the ports into which ISRC1, ISRC21, and ISRC22 flow (where k is the scaling factor of amplification module A) is shown in Table 1 below.

[0128]

[0129] Table 1

[0130] The relationship between the charging port into which the device to be charged is inserted, whether the charging port meets the preset parallel operation conditions, and the switch control signals is shown in Table 2 below.

[0131]

[0132] Table 2

[0133] When the first converter 121 and the second converter 122 are performing constant voltage output, the output voltage VIN1 of the first converter 121 is VDAC_CV1 * (R1 + R2) / R2, and the output voltage VIN2 of the second converter 122 is VDAC_CV2 * (R3 + R4) / R4. Wherein, VDAC_CV1 is the voltage feedback reference of the first converter 121, and VDAC_CV2 is the voltage feedback reference of the second converter 122.

[0134] When the first current loop and the second current loop are working, VIN1 and VIN2 can be further expressed as: VIN1 = VDAC_CV1 * (R1 + R2) / R2 - ISRC1 * R1 - ISRC21 * R1, VIN2 = VDAC_CV2 * (R3 + R4) / R4 - ISRC1 * R3 - ISRC22 * R3.

[0135] When P1 is greater than P2, if the device to be charged is plugged into the first charging port 111 (or the second charging port 112), it will initially be powered by the first converter 121, with VIN2 following VIN1 and VIN2 > VIN1 (normally 0.3-0.5V higher). For example, VIN2 > VIN1 can be achieved by setting VDAC_CV2 to be slightly higher than VDAC_CV1. When the first charging port 111 (or the second charging port 112) reaches the preset parallel operation condition, the controller 151 controls the first converter 121 and the second converter 122 to jointly supply power to the first charging port 111 (or the second charging port 112) in parallel operation. Since VIN2 > VIN1, the second converter 122 will output current to the first charging port 111 (or the second charging port 112). At this time, the first current loop starts to work, the VCPC1 voltage rises, and ISRC1 will be injected into the VFB2 input terminal, causing the VIN2 voltage to drop, thereby adjusting Io2, and thus making Io1 and Io2 reach a stable state of current sharing or current distribution according to a preset ratio (current distribution according to a preset ratio is achieved by adjusting the proportional coefficient k of the amplification module A).

[0136] When the total constant current value is reached, the second current loop starts to work, VCPC2 starts to rise, and ISRC21 and ISRC22 simultaneously inject into the VFB1 and VFB2 input terminals to adjust Io1 and Io2 at the same time, thereby achieving both demand-based current distribution (or current sharing) and total constant current.

[0137] It should be noted that this disclosure uses software to determine whether the preset parallel operation conditions are met, and combines hardware parallel operation control to achieve current distribution on demand. Compared with relying solely on software control to achieve current distribution on demand, this can effectively improve the dynamic response speed and constant current control accuracy of the parallel operation.

[0138] Taking a preset power of 45W for the first converter 121 and a preset power of 20W for the second converter 122 as an example, the signal change process of the device to be charged when plugged into the first charging port 111 (or the second charging port 112) is as follows: Figure 6 As shown.

[0139] 0~t0: In low power conditions, it is powered by the first converter 121. VIN2 follows the voltage of VIN1 and is 0.3-0.5V higher than VIN1.

[0140] t0~t1: At time t0, the parallel operation condition is met, and the first converter 121 and the second converter 122 are powered together. Since VIN2 > VIN1, the power is supplied by the output current of the second converter 122, the first current loop starts working, the VCPC1 voltage increases, and ISRC1 flows into the VFB2 input terminal, causing the VIN2 voltage to decrease, eventually reaching a stable state. If k = 2, then VIFB1 = 2 * VIFB2, meaning that the output current of the first converter 121 is twice the output current of the second converter 122. t0~t1 is the current stabilization adjustment time.

[0141] t1~t2: Regardless of whether the load is increased or the voltage is adjusted, Io1 and Io2 are in a stable current state;

[0142] t2~t3: As Io1 and Io2 continue to rise, the second current loop starts working, the VCPC2 voltage rises, and ISRC21 and ISRC22 simultaneously inject current into the VFB1 and VFB2 terminals, causing the VIN1 and VIN2 voltages to drop simultaneously. After adjustment during the t2~t3 time period, Io1 and Io2 reach a total constant current state and simultaneously satisfy a 2:1 current distribution.

[0143] This application also provides a charger 20, such as Figure 7 As shown, the charger 20 may include Figures 1-5 10 is a multi-port charging circuit of any type.

[0144] Regarding the charger 20 in the above embodiments, the specific manner in which the multi-port charging circuit 10 performs its operation has been described in detail in the embodiments relating to the circuit, and will not be elaborated upon here.

[0145] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A multi-port charging circuit, characterized in that, m charging ports, m converters, m current sampling modules, (m 2 + m) / 2 first switches, m voltage feedback modules and a control module, m is an integer greater than or equal to 2; Each of the converters is connected to a charging port via a charging branch; each charging branch includes a current sampling module and a first switch, and every two charging branches are connected via a first switch; m converters are connected to m voltage feedback modules in a one-to-one correspondence. Each of the current sampling modules is used to detect the output current of the converter and send a current feedback signal to the control module; The control module is connected to each of the charging ports, each of the first switches, each of the current sampling modules, and each of the voltage feedback modules, respectively. It is used to control the opening and closing of the first switches when a device to be charged is inserted into the target charging port, so as to provide one-to-one single-device power supply and / or multiple-to-one parallel power supply to the target charging port.

2. The multi-port charging circuit according to claim 1, characterized in that, In the case that at least two of the m converters have different operating power, a second switch is also provided on each target charging branch, and each second switch is connected to the control module; The target charging branch is the charging branch connected to the other converters among the m converters, excluding the converter with the highest operating power.

3. The multi-port charging circuit according to claim 2, characterized in that, When there are n target charging ports, the control module is used to: based on preset power of n target charging ports and working power of m converters, controlling on-off of (m 2 + m) / 2 first switches and m-1 second switches, so that n converters with working power in descending order supply power to n target charging ports; wherein n is an integer greater than or equal to 1 and less than or equal to m. When the n converters supply power to the n target charging ports, voltage adjustment signals are sent to the voltage feedback modules corresponding to the n converters based on the current feedback signals of the n converters, so that the voltage feedback modules adjust the output current of the n converters respectively, so that the n converters can output constant current.

4. The multi-port charging circuit according to claim 3, characterized in that, When n is less than m, the control module is also used for: The control module is further configured to select p parallel charging ports from the n target charging ports, and when the n converters supply power to the n target charging ports individually, if the power supply parameters of the p parallel charging ports meet a preset parallel condition, control (m 2 the on-off of the (m + m) / 2 first switches and m-1 second switches, so that m-n+p converters supply power to the p parallel charging ports in parallel. p is an integer greater than or equal to 1 and less than or equal to n; When m-n+p converters supply power to p parallel charging ports, voltage adjustment signals are sent to the voltage feedback modules corresponding to m-n+p converters based on the current feedback signals of the m-n+p converters. This causes the voltage feedback modules to adjust the output current of the m-n+p converters, so that the output currents of the m-n+p converters maintain a preset proportional relationship, and / or the sum of the output currents of the m-n+p converters remains constant.

5. The multi-port charging circuit according to claim 1, characterized in that, When m=2, the multi-port charging circuit includes a first charging port, a second charging port, a first converter, a second converter, a first current sampling module, a second current sampling module, three first switches, a first voltage feedback module, a second voltage feedback module, and the control module. The first current sampling module has a first end connected to the output end of the first converter and a second end connected to the first charging port via a first switch; the second current sampling module has a first end connected to the output end of the second converter and a second end connected to the second charging port via a first switch; the second end of the first current sampling module and the second end of the second current sampling module are connected via a first switch. The first voltage feedback module has a first terminal connected to the output terminal of the first converter, a second terminal connected to the feedback terminal of the first converter, and a third terminal connected to the control module; the second voltage feedback module has a first terminal connected to the output terminal of the second converter, a second terminal connected to the feedback terminal of the second converter, and a third terminal connected to the control module. The first charging port, the second charging port, each of the first switches, the output terminal of the first current sampling module, and the output terminal of the second current sampling module are all connected to the control module.

6. The multi-port charging circuit according to claim 5, characterized in that, When the target charging port includes both the first charging port and the second charging port, the control module is used to: Control the on / off state of the three first switches to enable the first converter to supply power to the first charging port and enable the second converter to supply power to the second charging port. Based on the first current feedback signal sent by the first current sampling module, a first voltage adjustment signal is output to the first voltage feedback module, so that the first voltage feedback module adjusts the output current of the first converter, so that the first converter can perform constant current output. Based on the second current feedback signal sent by the second current sampling module, a second voltage adjustment signal is output to the second voltage feedback module, so that the second voltage feedback module adjusts the output current of the second converter, so that the second converter can perform constant current output.

7. The multi-port charging circuit according to claim 5, characterized in that, When the target charging port is either the first charging port or the second charging port, and the operating power of the first converter is greater than the operating power of the second converter, the control module is configured to: Controlling the on / off state of the three first switches enables the first converter to supply power to the target charging port, and based on the first current feedback signal sent by the first current sampling module, outputting a first voltage adjustment signal to the first voltage feedback module, so that the first voltage feedback module adjusts the output current of the first converter, so that the first converter can output a constant current. If the power supply parameters of the target charging port meet the preset parallel operation conditions, the first converter and the second converter are controlled to provide parallel power to the target charging port. Based on the first current feedback signal and the second current feedback signal sent by the second current sampling module, a first voltage adjustment signal is output to the first voltage feedback module, and / or a second voltage adjustment signal is output to the second voltage feedback module. This causes the first voltage feedback module to adjust the output current of the first converter, and the second voltage feedback module to adjust the output current of the second converter, so that the output current of the first converter and the output current of the second converter maintain a preset proportional relationship, and / or the sum of the output current of the first converter and the output current of the second converter remains constant.

8. The multi-port charging circuit according to claim 6 or 7, characterized in that, The control module includes a first loop control circuit and a controller; the first loop control circuit includes a first operational amplifier, a first current source, a first capacitor, an amplification module, and seven third switches; each of the third switches is connected to the controller; The non-inverting input terminal and the inverting input terminal of the first operational amplifier are respectively connected to the output terminal of the first current sampling module through two third switches; the output terminal of the second current sampling module is connected to the first terminal of the amplification module; the non-inverting input terminal and the inverting input terminal of the first operational amplifier are respectively connected to the second terminal of the amplification module through two third switches; the inverting input terminal of the first operational amplifier is connected to the first current feedback reference through one of the third switches. The first current source has its first terminal connected to the first power supply, its first control terminal connected to the output terminal of the first operational amplifier and the first terminal of the first capacitor, and its second control terminal connected to the second terminal of the first capacitor; the second terminal of the first capacitor is grounded; the third terminals of the first voltage feedback module and the second voltage feedback module are respectively connected to the second terminal of the first current source through two third switches.

9. The multi-port charging circuit according to claim 8, characterized in that, The control module further includes a second loop control circuit; the second loop control circuit includes a second operational amplifier, a second current source, a third current source, a second capacitor, an adder, and four fourth switches; each of the fourth switches is connected to the controller; The output terminal of the first current sampling module is connected to the first terminal of the adder, and the output terminal of the second current sampling module is connected to the second terminal of the adder; the output terminal of the adder is connected to the non-inverting input terminal of the second operational amplifier through a fourth switch; the output terminal of the second current sampling module is also connected to the non-inverting input terminal of the second operational amplifier through a fourth switch; the inverting input terminal of the first operational amplifier is connected to the second current feedback reference. The second current source has its first terminal connected to the second power supply, its first control terminal connected to the output terminal of the second operational amplifier and the first terminal of the second capacitor, and its second control terminal connected to the second terminal of the second capacitor; the second terminal of the second capacitor is grounded; the third current source has its first terminal connected to the third power supply, its first control terminal connected to the output terminal of the second operational amplifier, and its second control terminal grounded; The third terminal of the first voltage feedback module is connected to the second terminal of the second current source through a fourth switch, and the fourth terminal of the second voltage feedback module is connected to the second terminal of the third current source through a fourth switch.

10. A charger, characterized in that, The charger includes a multi-port charging circuit as described in any one of claims 1-9.

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