Voltage converter, controller applied to voltage converter and power adapter

Abstract

The invention provides a voltage converter, a controller applied to the voltage converter and a power adapter, in the voltage converter, the input end of a transformer is connected to an input port, and the first output end of the transformer is connected with the input end of each of at least two first switch groups; the output end of each first switch group is connected to the first output port corresponding to each first switch group, and the second output end of the transformer is connected to the second output port. Under the condition that the power demand of the voltage converter is to output at least two paths of target power, the controller is used for controlling each first switch group in the at least two first switch groups to output the target power to the first output port corresponding to each first switch group in the same demagnetization period of the transformer; according to the voltage converter, cycle-by-cycle multi-port power distribution can be realized, so that different power requirements of the at least two first output ports are met, the power loss of the voltage converter is reduced, the cost of the voltage converter is reduced, and the size is reduced.

Description

Voltage converter, controller for voltage converter, and power adapter Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a voltage converter, a controller applied to the voltage converter, and a power adapter. Background Art

[0002] A flyback converter is a device with a voltage conversion function that converts an input voltage into a desired output voltage and powers electronic devices. Generally speaking, a flyback converter includes a flyback conversion circuit. When the flyback converter's power requirement is to output two power paths, two buck conversion circuits are added to the flyback converter. Each of the two buck conversion circuits converts the DC power output by the flyback converter circuit and outputs one power path. In other words, the two buck conversion circuits output two power paths, thus meeting the power requirement of the flyback converter. However, adding two buck conversion circuits to the flyback converter results in excessive cost and bulk.

[0003] Summary of the Invention

[0004] The present application provides a voltage converter, a controller for the voltage converter, and a power adapter. When meeting the different power requirements of at least two first output ports, there is no need to add multiple step-down conversion circuits in the voltage converter, thereby reducing the cost and size of the voltage converter and having strong applicability.

[0005] In a first aspect, a voltage converter is provided. The voltage converter includes an input port, a transformer, at least two first switch groups, at least two first output ports, a second output port, and a controller. The at least two first switch groups correspond to the at least two first output ports in a one-to-one manner. The transformer's input is connected to the input port, the transformer's first output is connected to the input of each of the at least two first switch groups, the output of each of the first switch groups is connected to the first output port corresponding to each of the first switch groups, and the transformer's second output is connected to the second output port. When the voltage converter requires at least two target power outputs, the controller controls each of the at least two first switch groups to output the target power to the first output port corresponding to each of the first switch groups during the same demagnetization cycle of the transformer. In this case, the voltage converter outputs at least two target powers during the same demagnetization cycle of the transformer, enabling cycle-by-cycle multi-port power allocation to meet the different power requirements of the at least two first output ports and reducing power losses in the voltage converter. Furthermore, meeting the different power requirements of the at least two first output ports eliminates the need to add multiple step-down conversion circuits to the voltage converter, thereby reducing the cost and size of the voltage converter and enhancing its applicability.

[0006] In conjunction with the first aspect, in a first possible implementation, the controller is configured to obtain sampling parameters of the first output port corresponding to each first switch group, and adjust the on-time of each first switch group based on the sampling parameters of the first output port corresponding to each first switch group. The sampling parameters include a sampled voltage or a sampled power. It is understood that since the ratio of the on-time of each first switch group to the switching period of each first switch group is the duty cycle of each first switch group, and the switching period of each first switch group is the same as the demagnetization period of the transformer, the controller adjusts the on-time of each first switch group by adjusting the duty cycle of each first switch group, thereby dynamically adjusting the current and voltage output by each first switch group to its corresponding first output port, so that each first switch group outputs the target power to its corresponding first output port within the same demagnetization period of the transformer. This achieves cycle-by-cycle multi-port power distribution and multi-port voltage distribution, enhancing applicability.

[0007] In conjunction with the first possible implementation manner of the first aspect, in a second possible implementation manner, the controller is configured to obtain a drive signal for each first switch group based on a comparison result between a sampled parameter of the first output port corresponding to each first switch group and a reference parameter of the first output port corresponding to each first switch group, and adjust the on-time of each first switch group based on the drive signal of each first switch group. It is understood that when the magnitude of the sampled parameter and the magnitude of the reference parameter of the first output port corresponding to each first switch group changes, the comparison result between the two will also change accordingly, causing the drive signal of each first switch group to change in real time. In this case, the controller can dynamically adjust the on-time of each first switch group based on the real-time changing drive signal of each first switch group, thereby dynamically adjusting the duty cycle of each first switch group, thereby meeting the power demand of the first output port corresponding to each first switch group in real time, thereby enhancing applicability.

[0008] In conjunction with the second possible implementation manner of the first aspect, in a third possible implementation manner, the controller includes at least two comparators, and the at least two first switch groups correspond one-to-one to the at least two comparators. The inverting input of the comparator corresponding to each first switch group is connected to the output of each first switch group, and the non-inverting input of the comparator corresponding to each first switch group is connected to the reference parameter of the first output port corresponding to each first switch group. The comparator corresponding to each switch group is configured to obtain a low-level drive signal for each first switch group when the sampling parameter of the first output port corresponding to each first switch group is greater than the reference parameter of the first output port corresponding to each first switch group. The comparator corresponding to each switch group is further configured to obtain a high-level drive signal for each first switch group when the sampling parameter of the first output port corresponding to each first switch group is less than the reference parameter of the first output port corresponding to each first switch group. It will be appreciated that the comparator can dynamically adjust the drive signal for each first switch group based on the comparison result of the sampling parameter of the first output port corresponding to each first switch group and the reference parameter, thereby achieving a faster dynamic response speed.

[0009] In combination with the second possible implementation manner of the first aspect or the third possible implementation manner of the first aspect, in a fourth possible implementation manner, a single demagnetization cycle of the transformer includes at least two time periods, and the at least two first switch groups correspond one-to-one to the at least two time periods. The controller is configured to control each first switch group to be conductive during the time period corresponding to each first switch group based on a drive signal of each first switch group, and to control each first switch group to be disconnected during other time periods of the at least two time periods, except for the time period corresponding to each first switch group, based on the drive signal of each first switch group. This allows time-sharing multiplexing of demagnetization time and demagnetization current during the demagnetization phase of the transformer, thereby achieving cycle-by-cycle multi-port power distribution and multi-port voltage distribution.

[0010] In combination with any one of the first aspect to the fourth possible implementation of the first aspect, in a fifth possible implementation, the voltage converter further includes a second switch group, which is arranged between the first output terminal of the transformer and the input terminals of each of the first switch groups. When the power requirement of the voltage converter is to output at least two target powers, the controller is used to control the second switch group to conduct. At this time, the output power of the transformer is output to at least two first switch groups through the second switch group, and the sum of the target powers output by each first switch group to its corresponding first output port is the same as the output power of the transformer. Therefore, at least two first output ports can arbitrarily share the output power of the transformer, which provides greater flexibility in application.

[0011] In combination with any one of the first aspect to the fifth possible implementation of the first aspect, in a sixth possible implementation, each of the above-mentioned first switch groups includes two switches, and the two switches are connected in reverse series, which can reduce the on-resistance of the switch to improve the switching efficiency, or can reduce the circuit cost of the voltage converter.

[0012] In combination with any one of the first aspect to the fifth possible implementation of the first aspect, in a seventh possible implementation, the voltage converter further includes at least two filter circuits, and the at least two first switch groups correspond one to one with the at least two filter circuits. The output end of each first switch group is respectively connected to the first connection end of the filter circuit corresponding to each first switch group, the second connection end of the filter circuit corresponding to each first switch group is respectively connected to the first output port corresponding to each first switch group, and the second output end of the transformer is connected to the third connection end of each filter circuit in the at least two filter circuits. It can be understood that the filter circuit corresponding to each first switch group can filter the voltage output by each first switch group to eliminate the AC component in the voltage, and output DC power to the first output port corresponding to each first switch group, thereby improving the power supply reliability of the voltage converter.

[0013] In a second aspect, the present application provides a controller for a voltage converter, comprising an input port, a transformer, at least two first switch groups, at least two first output ports, and a second output port, wherein one of the at least two first switch groups corresponds to the at least two first output ports. The transformer's input port is connected to the input port, the transformer's first output port is connected to the input port of each of the at least two first switch groups, the output ports of each of the first switch groups are connected to the first output ports corresponding to each of the first switch groups, and the transformer's second output port is connected to the second output port. When the voltage converter's power requirement is to output at least two target powers, the controller is configured to control each of the at least two first switch groups to output the target power to the first output port corresponding to each of the first switch groups during the same demagnetization cycle of the transformer. In this case, the voltage converter outputs at least two target powers during the same demagnetization cycle of the transformer, enabling cycle-by-cycle multi-port power allocation to meet the different power requirements of the at least two first output ports and reducing power loss in the voltage converter.

[0014] In conjunction with the second aspect, in a first possible implementation, the controller is configured to obtain sampling parameters of the first output port corresponding to each first switch group, and adjust the on-time of each first switch group based on the sampling parameters of the first output port corresponding to each first switch group. The sampling parameters include a sampled voltage or a sampled power. It is understood that since the ratio of the on-time of each first switch group to the switching period of each first switch group is the duty cycle of each first switch group, and the switching period of each first switch group is the same as the demagnetization period of the transformer, the controller adjusts the on-time of each first switch group by adjusting the duty cycle of each first switch group, thereby dynamically adjusting the current and voltage output by each first switch group to its corresponding first output port, so that each first switch group outputs the target power to its corresponding first output port within the same demagnetization period of the transformer. This achieves cycle-by-cycle multi-port power distribution and multi-port voltage distribution, which enhances applicability.

[0015] In conjunction with the first possible implementation manner of the second aspect, in a second possible implementation manner, the controller is configured to obtain a drive signal for each first switch group based on a comparison result between a sampled parameter of the first output port corresponding to each first switch group and a reference parameter of the first output port corresponding to each first switch group, and adjust the on-time of each first switch group based on the drive signal of each first switch group. It is understood that when the magnitude of the sampled parameter and the magnitude of the reference parameter of the first output port corresponding to each first switch group changes, the comparison result between the two will also change accordingly, causing the drive signal of each first switch group to change in real time. In this case, the controller can dynamically adjust the on-time of each first switch group based on the real-time changing drive signal of each first switch group, thereby dynamically adjusting the duty cycle of each first switch group, thereby meeting the power demand of the first output port corresponding to each first switch group in real time, thereby enhancing applicability.

[0016] In conjunction with the second possible implementation manner of the second aspect, in a third possible implementation manner, the controller includes at least two comparators, and the at least two first switch groups correspond one-to-one to the at least two comparators. The inverting input of the comparator corresponding to each first switch group is connected to the output of each first switch group, and the non-inverting input of the comparator corresponding to each first switch group is connected to the reference parameter of the first output port corresponding to each first switch group. The comparator corresponding to each switch group is configured to obtain a low-level drive signal for each first switch group when the sampling parameter of the first output port corresponding to each first switch group is greater than the reference parameter of the first output port corresponding to each first switch group. The comparator corresponding to each switch group is further configured to obtain a high-level drive signal for each first switch group when the sampling parameter of the first output port corresponding to each first switch group is less than the reference parameter of the first output port corresponding to each first switch group. It will be appreciated that the comparator can dynamically adjust the drive signal for each first switch group based on the comparison result of the sampling parameter of the first output port corresponding to each first switch group and the reference parameter, thereby achieving a faster dynamic response speed.

[0017] In combination with the second possible implementation manner of the second aspect or the third possible implementation manner of the first aspect, in a fourth possible implementation manner, a single demagnetization cycle of the transformer includes at least two time periods, and the at least two first switch groups correspond one-to-one to the at least two time periods. The controller is configured to control each first switch group to be conductive during the time period corresponding to each first switch group based on a drive signal of each first switch group, and to control each first switch group to be disconnected during other time periods of the at least two time periods, except for the time period corresponding to each first switch group, based on the drive signal of each first switch group. This allows time-sharing multiplexing of demagnetization time and demagnetization current during the demagnetization phase of the transformer, thereby achieving cycle-by-cycle multi-port power distribution and multi-port voltage distribution.

[0018] In combination with any one of the second aspect to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner, the voltage converter further includes a second switch group, which is arranged between the first output terminal of the transformer and the input terminals of each of the first switch groups. When the power requirement of the voltage converter is to output at least two target powers, the controller is used to control the second switch group to conduct. At this time, the output power of the transformer is output to at least two first switch groups through the second switch group, and the sum of the target powers output by each first switch group to its corresponding first output port is the same as the output power of the transformer. Therefore, at least two first output ports can arbitrarily share the output power of the transformer, which provides greater flexibility in application.

[0019] In a third aspect, the present application provides a power adapter, which includes a protocol chip and a voltage converter provided in any one of the possible implementations of the first aspect to the first aspect. The protocol chip is used to detect the sampling parameters of the first output port corresponding to each first switch group, and send the sampling parameters of the first output port corresponding to each first switch group to the controller. Furthermore, the controller can dynamically adjust the output power of each first switch group according to the sampling parameters of the first output port corresponding to each first switch group, so that the voltage converter outputs at least two target powers. At this time, the power adapter supplies power to at least two electronic devices based on the at least two target powers, thereby improving the power supply efficiency of the electronic devices and making them more applicable.

[0020] In this application, the voltage converter can output at least two target powers within the same demagnetization cycle of the transformer, achieving cycle-by-cycle multi-port power distribution and meeting the different power requirements of at least two first output ports, thereby reducing power losses in the voltage converter. Furthermore, meeting the different power requirements of at least two first output ports eliminates the need to add multiple step-down conversion circuits to the voltage converter, thereby reducing the cost and size of the voltage converter and enhancing its applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of an application scenario of a voltage converter provided by the present application;

[0022] FIG2A is a schematic structural diagram of a voltage converter provided by the present application;

[0023] FIG2B is another schematic structural diagram of a voltage converter provided by the present application;

[0024] FIG3 is another schematic structural diagram of a voltage converter provided by the present application;

[0025] FIG4 is another schematic structural diagram of a voltage converter provided by the present application;

[0026] FIG5 is another schematic structural diagram of a voltage converter provided by the present application;

[0027] FIG6 is another schematic structural diagram of the voltage converter provided by the present application;

[0028] FIG7 is another schematic structural diagram of a voltage converter provided by the present application;

[0029] FIG8A is another schematic structural diagram of a voltage converter provided by the present application;

[0030] FIG8B is another schematic structural diagram of a voltage converter provided by the present application;

[0031] FIG9 is another schematic structural diagram of the voltage converter provided by the present application;

[0032] FIG10A is a timing diagram of the operation of the voltage converter provided by the present application when outputting two paths of the same target power;

[0033] FIG10B is a timing diagram of the operation of the voltage converter provided by the present application when outputting two different target powers;

[0034] FIG11 is another schematic structural diagram of a voltage converter provided by the present application;

[0035] FIG12 is a schematic structural diagram of the power adapter provided in this application. DETAILED DESCRIPTION

[0036] The voltage converter provided in this application can be used in the fields of electronic equipment, industry, aerospace, and other fields. Specifically, the voltage converter provided in this application can be used in power adapters and chargers for electronic equipment, industrial power supplies, and aerospace power supplies, etc., to convert alternating current (AC) into DC power suitable for electronic equipment, industrial equipment, aerospace equipment, etc. The voltage converter provided in this application is suitable for powering electronic equipment, electric vehicles, and other applications. The following uses the powering of electronic equipment as an example for explanation.

[0037] FIG1 is a schematic diagram of an application scenario for the voltage converter provided in this application. As shown in FIG1 , in an electronic device power supply scenario, the input end of voltage converter 2 is connected to power grid 1, and the output end of voltage converter 2 is connected to electronic devices 3a through 3n. Exemplarily, voltage converter 2 may be a power adapter for electronic devices 3a through 3n. Voltage converter 2 can convert the AC power provided by power grid 1 and output the target power required by each electronic device 3a through 3n, thereby powering electronic devices 3a through 3n. During powering of electronic devices 3a through 3n, voltage converter 2 can control the target power output to each electronic device, thereby meeting the different power requirements of electronic devices 3a through 3n and reducing power losses in voltage converter 2. Furthermore, meeting the different power requirements of electronic devices 3a through 3n eliminates the need to add multiple step-down conversion circuits to voltage converter 2, thereby reducing the cost and size of voltage converter 2 and enhancing its applicability. The above examples are merely illustrative of application scenarios for the voltage converter provided in this application, and are not exhaustive. This application does not limit these application scenarios.

[0038] The voltage converter 2, the power adapter and their working principles provided by the present application will be illustrated below with reference to FIG. 2A to FIG. 12 .

[0039] FIG2A is a schematic diagram of the structure of a voltage converter provided by the present application. As shown in FIG2A , the voltage converter 2 includes an input port in1, a transformer 21, first switch groups 22a to 22n, first output ports out21 to out2n, a second output port out3, and a controller 23. The first switch groups 22a to 22n correspond one-to-one with the first output ports out21 to out2n. The input terminal in2 of the transformer 21 is connected to the input port in1, and the output terminal out11 of the transformer 21 serves as the first output terminal of the transformer 21 and is connected to the input terminal of each first switch group in the first switch groups 22a to 22n. The output terminal of each first switch group is respectively connected to the first output port corresponding to each first switch group. Specifically, the output terminal of the first switch group 22a is connected to the first output port out21 corresponding to the first switch group 22a, ..., and the output terminal of the first switch group 22n is connected to the first output port out2n corresponding to the first switch group 22n. The output terminal out12 of the transformer 21 serves as the second output terminal of the transformer 21 and is connected to the second output port out3 .

[0040] Alternatively, the positional relationship between the components of the voltage converter 2 shown in FIG2A may be as shown in FIG2B . In this case, the output terminal out12 of the transformer 21 serves as the first output terminal of the transformer 21 and is connected to the input terminals of each of the first switch groups 22a to 22n. The output terminal out11 of the transformer 21 serves as the second output terminal of the transformer 21 and is connected to the second output port out3.

[0041] The second output port out3 may serve as a reference port for each of the first output ports out21 to out2n, that is, the output voltage of each first output port is the voltage between each first output port and the second output port out3.

[0042] For the convenience of description, the specific structure and working principle of the voltage converter will be illustrated below by taking the voltage converter 2 shown in FIG. 2A as an example.

[0043] In one embodiment, the controller 23 communicates with each of the first switch groups 22a through 22n via wired or wireless communication to control the first switch groups 22a through 22n. When the power requirement of the voltage converter 2 is to output at least two target powers, the controller 23 is configured to control each of the first switch groups 22a through 22n to output the target power to the first output port corresponding to each of the first switch groups during the same demagnetization cycle of the transformer 21. In this case, the voltage converter 2 outputs at least two target powers during the same demagnetization cycle of the transformer 21, enabling cycle-by-cycle multi-port power allocation to meet the different power requirements of the first output ports out21 through out2n, thereby reducing power losses in the voltage converter 2. Furthermore, meeting the different power requirements of the first output ports out21 through out2n eliminates the need to add multiple step-down conversion circuits to the voltage converter 2, thereby reducing the cost and size of the voltage converter 2 and enhancing its applicability.

[0044] In one embodiment, since the output power of the transformer 21 is output to each first switch group, and the sum of the target powers output by each first switch group to its corresponding first output port is the same as the output power of the transformer 21, the first output port out21 to the first output port out2n can arbitrarily share the output power of the transformer 21, which is more flexible in use.

[0045] In one embodiment, the input port in1 is used to connect to an AC power source.

[0046] In one embodiment, each first switch group includes one switch or multiple switches. Each first switch group includes one or more switches selected from the group consisting of a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), a bipolar junction transistor (BJT), and an insulated gate field-effect transistor (MOS).

[0047] In one embodiment, when any one of the first output ports out21 to out2n and the second output port out3 are connected to both ends of an electronic device, the target power output by any first switch group to its corresponding first output port is the same as the power required by the electronic device, thereby providing power to the electronic device. It is understood that since the voltage converter 2 has the first output ports out21 to out2n, that is, the voltage converter 2 has n first output ports, the voltage converter 2 can simultaneously power n electronic devices, thereby improving the power supply efficiency and power supply flexibility of the electronic devices. Where n is greater than or equal to 2. For example, the n electronic devices may be the electronic devices 3a to 3n shown in FIG1 .

[0048] In one embodiment, the target powers outputted to the corresponding first output ports by any two first switch groups among the first switch groups 22 a to 22 n may be the same or different.

[0049] In one embodiment, the controller 23 may be a microcontroller unit (MCU), a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. For example, the controller 23 may be an integrated circuit (IC) chip or a driver.

[0050] In one embodiment, when the power requirement of the voltage converter 2 is to output at least two target powers, the controller 23 is configured to obtain sampling parameters of the first output port corresponding to each first switch group and, based on the sampling parameters of the first output port corresponding to each first switch group, adjust the on-time of each first switch group to control each first switch group to output the target power to the first output port corresponding to each first switch group within the same demagnetization cycle of the transformer 21. The sampling parameters include sampled voltage or sampled power; optionally, the sampling parameters may also be sampled current. It is understood that since the ratio of the on-time of each first switch group to the switching period of each first switch group is the duty cycle of each first switch group, and the switching period of each first switch group is the same as the demagnetization period of the transformer 21, the controller 23 adjusting the on-time of each first switch group is also adjusting the duty cycle of each first switch group, thereby dynamically adjusting the current and voltage output by each first switch group to its corresponding first output port, so that each first switch group outputs the target power to its corresponding first output port within the same demagnetization period of the transformer 21. This achieves cycle-by-cycle multi-port power distribution and multi-port voltage distribution, which is more applicable.

[0051] In one embodiment, the controller 23 is configured to obtain a drive signal for each first switch group based on a comparison result between a sampled parameter of the first output port corresponding to each first switch group and a reference parameter of the first output port corresponding to each first switch group, and to adjust the on-time of each first switch group based on the drive signal of each first switch group. It is understood that if the magnitude of the sampled parameter and the reference parameter of the first output port corresponding to each first switch group changes, the comparison result will also change accordingly, causing the drive signal of each first switch group to change in real time. In this case, the controller 23 can dynamically adjust the on-time of each first switch group based on the real-time change in the drive signal of each first switch group, thereby dynamically adjusting the duty cycle of each first switch group, thereby meeting the power demand of the first output port corresponding to each first switch group in real time, thereby enhancing applicability.

[0052] In one embodiment, the specific implementation method for controller 23 to obtain the drive signal for each first switch group can be described below. In one specific implementation, controller 23 is configured to obtain the drive signal for each first switch group at a low level when the sampling parameter of the first output port corresponding to each first switch group is greater than the reference parameter of the first output port corresponding to each first switch group. Controller 23 is also configured to obtain the drive signal for each first switch group at a high level when the sampling parameter of the first output port corresponding to each first switch group is less than the reference parameter of the first output port corresponding to each first switch group. In another specific implementation, controller 23 is also configured to obtain the drive signal for each first switch group at a high level when the sampling parameter of the first output port corresponding to each first switch group is greater than the reference parameter of the first output port corresponding to each first switch group, and to obtain the drive signal for each first switch group at a low level when the sampling parameter of the first output port corresponding to each first switch group is less than the reference parameter of the first output port corresponding to each first switch group. In both of the above specific implementations, when the sampling parameter is a sampling voltage, the reference parameter is the reference voltage. When the sampling parameter is a sampling power, the reference parameter is the reference power.

[0053] In one embodiment, the controller 23 can obtain the drive signal for each first switch group via a built-in comparator. As shown in FIG3 , the controller 23 includes comparators TL1 to TLn, and the first switch groups 22a to 22n correspond one-to-one to the comparators TL1 to TLn. The inverting input of the comparator corresponding to each first switch group is connected to the output of each first switch group, and the non-inverting input of the comparator corresponding to each first switch group is connected to the reference parameter of the first output port corresponding to each first switch group.

[0054] The comparator corresponding to each switch group is used to obtain the sampling parameters of the first output port corresponding to each first switch group.

[0055] The comparator corresponding to each switch group is configured to obtain a low-level drive signal for each first switch group when the sampling parameter of the first output port corresponding to each first switch group is greater than a reference parameter of the first output port corresponding to each first switch group. The comparator corresponding to each switch group is also configured to obtain a high-level drive signal for each first switch group when the sampling parameter of the first output port corresponding to each first switch group is less than the reference parameter of the first output port corresponding to each first switch group. It will be appreciated that the comparator can dynamically adjust the drive signal for each first switch group based on the comparison result of the sampling parameter of the first output port corresponding to each first switch group and the reference parameter, thereby achieving a faster dynamic response speed.

[0056] For example, as shown in FIG3 , the inverting input of comparator TL1 corresponding to first switch group 22a is connected to the output of first switch group 22a, and the non-inverting input of comparator TL1 is connected to the reference parameter Vref1 of first output port out21. Furthermore, the inverting input of comparator TLn corresponding to first switch group 22n is connected to the output of first switch group 22n, and the non-inverting input of comparator TLn is connected to the reference parameter Vrefn of first output port out2n. Taking comparator TL1 and comparator TLn as examples, when the sampling parameter is a sampling voltage, reference parameter Vref1 is reference voltage Vref1, and reference parameter Vrefn is reference voltage Vrefn. Comparator TL1 is configured to obtain a low-level drive signal for first switch group 22a when the sampling voltage at first output port out21 is greater than reference voltage Vref1, and to obtain a high-level drive signal for first switch group 22a when the sampling voltage at first output port out21 is less than reference voltage Vref1. The comparator TLn is used to obtain a low level driving signal for the first switch group 22n when the sampling voltage of the first output port out2n is greater than the reference voltage Vrefn, and to obtain a high level driving signal for the first switch group 22n when the sampling voltage of the first output port out21 is less than the reference voltage Vrefn.

[0057] In one embodiment, the same demagnetization cycle of the transformer 21 includes at least two time periods, and the first switch groups 22a through 22n correspond to the at least two time periods. The controller 23 is configured to control each first switch group to conduct during the time period corresponding to each first switch group based on a drive signal from each first switch group, and to control each first switch group to shut down during the other time periods of the at least two time periods, except for the time period corresponding to each first switch group, based on the drive signal from each first switch group. This allows time-sharing of the demagnetization time and demagnetization current during the demagnetization phase of the transformer 21, thereby achieving cycle-by-cycle multi-port power distribution and multi-port voltage distribution. The time period corresponding to each first switch group can be any one of the at least two time periods, and the time periods corresponding to any two first switch groups are different time periods. The duration of the time period corresponding to each first switch group is the same as the conduction time of each first switch group.

[0058] In one embodiment, as shown in FIG4 , the voltage converter 2 shown in FIG2A further includes a second switch group 24, which is disposed between the output terminal out11 of the transformer 21 and the input terminals of each first switch group. The controller 23 communicates with the second switch group 24 via wired or wireless communication to control the second switch group 24. When the power requirement of the voltage converter 2 is to output at least two target powers, the controller 23 is configured to control the second switch group 24 to conduct. At this time, the output power of the transformer 21 is output to each first switch group through the second switch group 24, and the sum of the target powers output by each first switch group to its corresponding first output port is the same as the output power of the transformer 21. Therefore, the output power of the transformer 21 can be shared arbitrarily by the first output port out21 to the first output port out2n, providing greater flexibility.

[0059] In one embodiment, the second switch group 24 includes one switch or multiple switches, including one or multiple switches selected from MOSFET, IGBT, BJT and MOS transistors.

[0060] In one embodiment, the first switch group 22a includes one switch, and the second switch group 24 includes one switch. As shown in FIG5 , the first switch group 22a shown in FIG4 includes switches S13, ..., and the first switch group 22n includes switch Sn3. The specific control method of the first switch group will be described using the first switch group 22a and the first switch group 22n as examples. The specific control method of the first switch group 22a can be described below. The drive signal of the first switch group 22a can be the drive signal of switch S13. When the drive signal of the first switch group 22a is high, the first switch group 22a is turned on during the first time period corresponding to each demagnetization cycle of the transformer 21. That is, switch S13 is turned on during the first time period corresponding to each demagnetization cycle. When the drive signal of the first switch group 22a is low, the first switch group 22a is turned off during the time periods other than the first time period of each demagnetization cycle. That is, switch S13 is turned off during the time periods other than the first time period of each demagnetization cycle.

[0061] The specific control method for the first switch group 22n can be described below. The drive signal for the first switch group 22n can be the drive signal for switch Sn3. When the drive signal for the first switch group 22n is high, the first switch group 22n is turned on during the second time period corresponding to each demagnetization cycle. That is, switch Sn3 is turned on during the second time period corresponding to each demagnetization cycle. When the drive signal for the first switch group 22n is low, the first switch group 22n is turned off during the time periods other than the second time period in each demagnetization cycle. That is, switch Sn3 is turned off during the time periods other than the second time period in each demagnetization cycle. In the specific control methods for the first switch group 22a and the first switch group 22n described above, the first time period in each demagnetization cycle can be before or after the second time period in each demagnetization cycle.

[0062] It should be noted that the specific control methods of other first switch groups in the first switch groups 22a to 22n can refer to the relevant description of the specific control methods of the above-mentioned first switch group 22a or the first switch group 22n, which will not be repeated here.

[0063] In one embodiment, as shown in FIG5 , the second switch group 24 shown in FIG4 includes a switch S2. The drain of switch S2 is connected to the drain of switch S13, ..., and the drain of switch S2 is connected to the drain of switch Sn3. When the second switch group 24 is turned on, switch S2 is turned on. Optionally, the source of switch S2 can also be connected to the source of switch S13, ..., and the source of switch S2 can also be connected to the source of switch Sn3.

[0064] In one embodiment, each of the first switch groups includes two switches, wherein the two switches are connected in reverse series. This can reduce the on-resistance of the switches, thereby improving switching efficiency, or can reduce the circuit cost of the voltage converter 2. Taking the two switches as MOS transistors as an example, one reverse series connection of the two switches is described below. The drain of one of the two switches is connected to the drain of the other switch, thereby forming a common D-pole structure. This reduces the on-resistance of the switches and thereby improves switching efficiency. Another reverse series connection of the two switches is described below. The source of one of the two switches is connected to the source of the other switch, thereby forming a common S-pole structure. In this case, the drive circuits corresponding to the two switches are powered by the same drive power supply, saving one drive power supply and thus reducing the circuit cost of the voltage converter 2.

[0065] For example, as shown in FIG6 , the first switch group 22a shown in FIG3 includes switches S11 and S12, with the drain of switch S11 connected to the drain of switch S12. The first switch group 22n includes switches Sn1 and Sn2, with the drain of switch Sn1 connected to the drain of switch Sn2. The specific control method of the first switch group will be described using the first switch group 22a and the first switch group 22n as examples. The specific control method of the first switch group 22a can be found in the following description. The drive signal of the first switch group 22a includes the drive signal of switch S11 and the drive signal of switch S12. When the drive signal of the first switch group 22a is high, the first switch group 22a is turned on during the first time period corresponding to each demagnetization cycle of the transformer 21. That is, both switches S11 and S12 are turned on during the first time period corresponding to each demagnetization cycle. When the drive signal of the first switch group 22a is at a low level, the first switch group 22a is turned off during each demagnetization cycle except the first time period. That is, the switches S11 and S12 are turned off during each demagnetization cycle except the first time period. Optionally, the switch S11 may remain in the on state or the off state during each demagnetization cycle of the transformer 21.

[0066] The specific control method for the first switch group 22n can be found in the following description. The drive signal for the first switch group 22n includes a drive signal for switch Sn1 and a drive signal for switch Sn2. When the drive signal for the first switch group 22n is high, the first switch group 22n is turned on during the second time period corresponding to each demagnetization cycle. That is, both switches Sn1 and Sn2 are turned on during the second time period corresponding to each demagnetization cycle. When the drive signal for the first switch group 22n is low, the first switch group 22n is turned off during the time periods other than the second time period of each demagnetization cycle. That is, both switches Sn1 and Sn2 are turned off during the time periods other than the second time period of each demagnetization cycle. Optionally, switch Sn1 can remain in the on state or the off state during each demagnetization cycle of the transformer 21. In the specific control methods for the first switch group 22a and the first switch group 22n described above, the first time period of each demagnetization cycle can be before or after the second time period of each demagnetization cycle.

[0067] It should be noted that the specific control methods of other first switch groups in the first switch groups 22a to 22n can refer to the relevant description of the specific control methods of the above-mentioned first switch group 22a or the first switch group 22n, which will not be repeated here.

[0068] In one embodiment, two switches in the first switch group may also be connected in reverse series to form a bidirectional switch, thereby improving the efficiency and power density of the voltage converter 2 .

[0069] In one embodiment, as shown in FIG7 , the voltage converter 2 shown in FIG6 further includes filter circuits 25 a to 25 n, and the first switch groups 22 a to 22 n correspond one-to-one to the filter circuits 25 a to 25 n. The output terminals of the respective first switch groups are connected to the first connection terminals of the filter circuits corresponding to the respective first switch groups, the second connection terminals of the filter circuits corresponding to the respective first switch groups are connected to the first output ports corresponding to the respective first switch groups, and the output terminal out12 of the transformer 21 is connected to the third connection terminals of the filter circuits 25 a to 25 n.

[0070] Specifically, the output end of the first switch group 22a is connected to the first connection end of the filter circuit 25a corresponding to the first switch group 22a, the second connection end of the filter circuit 25a is connected to the first output port out21, the output end out12 of the transformer 21 is connected to the third connection end of the filter circuit 25a,..., the output end of the first switch group 22n is connected to the first connection end of the filter circuit 25n corresponding to the first switch group 22n, the second connection end of the filter circuit 25n is connected to the first output port out2n, and the output end out12 of the transformer 21 is connected to the third connection end of the filter circuit 25n.

[0071] It can be understood that the filtering circuit corresponding to each first switch group can filter the voltage output by each first switch group to eliminate the AC component in the voltage, and output DC power to the first output port corresponding to each first switch group to power the electronic equipment, thereby improving the power supply reliability of the voltage converter 2.

[0072] In one embodiment, for each of the filter circuits 25 a to 25 n , the first connection terminal and the second connection terminal of each filter circuit may be the same connection terminal or different connection terminals.

[0073] In one embodiment, each filter circuit may be a capacitor filter circuit, an inductor filter circuit, an RC filter circuit, an LC filter circuit, and an active filter circuit.

[0074] In one embodiment, when each filter circuit is a capacitor filter circuit, as shown in FIG8A , filter circuit 25a shown in FIG7 includes filter capacitor C1, one end of which can serve as both the first connection terminal and the second connection terminal of filter circuit 25a, and the other end of filter capacitor C1 serves as the third connection terminal of filter circuit 25a. Filter circuit 25n includes filter capacitor Cn, one end of which can serve as both the first connection terminal and the second connection terminal of filter circuit 25n, and the other end of filter capacitor Cn serves as the third connection terminal of filter circuit 25n. The first connection terminal and the second connection terminal of each filter circuit in filter circuits 25a to 25n are the same connection terminal.

[0075] In one embodiment, when each filter circuit is an LC filter circuit, as shown in FIG8B , filter circuit 25a shown in FIG7 includes an inductor L1 and a filter capacitor C1, with one end of inductor L1 serving as the first connection end of filter circuit 25a, the other end of inductor L1 connected to one end of filter capacitor C1 serving as the second connection end of filter circuit 25a, and the other end of filter capacitor C1 serving as the third connection end of filter circuit 25a. Filter circuit 25n includes an inductor Ln and a filter capacitor Cn, with one end of inductor Ln serving as the first connection end of filter circuit 25n, the other end of inductor Ln connected to one end of filter capacitor Cn serving as the second connection end of filter circuit 25n, and the other end of filter capacitor Cn serving as the third connection end of filter circuit 25n. The first connection end and the second connection end of each filter circuit in filter circuits 25a through 25n are different connection ends.

[0076] In one embodiment, the voltage converter 2 further includes other functional circuits and electronic components. For ease of description, the following description will be based on an example in which the power requirement of the voltage converter 2 is to output two target powers. As shown in FIG9 , the voltage converter 2 includes a first switch group 22 a, a first switch group 22 n, a comparator TL1, a comparator TLn, a filter circuit 25 a, and a filter circuit 25 n. The voltage converter 2 further includes a capacitor C0, an absorption circuit 26, a switch S3, a resistor R1, a pulse-width modulation (PWM) controller 27, a diode D1 corresponding to the filter circuit 25 a, and a diode Dn corresponding to the filter circuit 25 n. The PWM controller 27 includes an output (DR) pin, a feedback (FB) pin, and a ground (GND) pin.

[0077] The transformer 21 includes a primary winding Np and a secondary winding Ns. The input terminal in2 of the transformer 21 includes a sub-input terminal in21 and a sub-input terminal in22. The opposite-name end of the primary winding Np serves as the sub-input terminal in21 of the transformer 21, and the same-name end of the primary winding Np serves as the sub-input terminal in22 of the transformer 21. The same-name end of the secondary winding Ns serves as the output terminal out11 of the transformer 21, and the opposite-name end of the secondary winding Ns serves as the output terminal out12 of the transformer 21. The sub-input terminal in21 of the transformer 21 is connected to the first connection terminal of the absorption circuit 26. The second connection terminal of the absorption circuit 26 and one end of the capacitor C0 are connected to the input port in1. The other end of the capacitor C0 is grounded. Exemplarily, the capacitor C0 is a buck capacitor. The sub-input terminal in22 of the transformer 21 is connected to the third connection terminal of the absorption circuit 26 and the drain of the switch S3. The source of the switch S3 is grounded via the resistor R1. The gate of the switch S3 is connected to the DR pin of the PWM controller 27. The FB pin of the PWM controller 27 is connected to the second connection terminal of the filter circuit 25a via a diode D1 to obtain a sampled filtered voltage at the first output port out21. The FB pin of the PWM controller 27 is connected to the second connection terminal of the filter circuit 25n via a diode Dn to obtain a sampled filtered voltage at the first output port out2n. The above is merely an example of the circuit topology of the voltage converter 2 provided in this application, and is not an exhaustive list. This application does not limit the circuit topology of the voltage converter 2.

[0078] In one embodiment, the absorption circuit 26 in FIG. 9 may also be replaced by a resonant circuit.

[0079] The working principle of the voltage converter 2 shown in FIG. 9 will be described below with reference to FIG. 10A and FIG. 10B .

[0080] When the power requirement of the voltage converter 2 is to output two target powers, the PWM controller 27 is used to obtain a sampled filtered voltage at the first output port out21 and a sampled filtered voltage at the first output port out2n. The sampled filtered voltage at the first output port out21 is the actual output voltage after filtering by the inductor L1 and the filter capacitor C1, while the sampled filtered voltage at the first output port out2n is the actual output voltage after filtering by the inductor Ln and the filter capacitor Cn. It will be appreciated that the inductor L1 in the filter circuit 25a is used to filter out high-frequency signals from the output voltage of the first switch group 22a and output the filtered voltage to the first output port out21, thereby improving the accuracy of the sampled filtered voltage at the first output port out21. The inductor Ln in the filter circuit 25n is used to filter out high-frequency signals from the output voltage of the first switch group 22n and output the filtered voltage to the first output port out2n, thereby improving the accuracy of the sampled filtered voltage at the first output port out2n.

[0081] Furthermore, the PWM controller 27 is further configured to generate a drive signal for the switch S3 based on the sampled filtered voltage at the first output port out21 and the sampled filtered voltage at the first output port out2n. For example, when the power requirement of the voltage converter 2 is to output two identical target powers, a timing diagram of the drive signal for the switch S3 and the drain-source voltage Vds of the switch S3 is shown in FIG10A . For example, when the power requirement of the voltage converter 2 is to output two different target powers, a timing diagram of the drive signal for the switch S3 and the drain-source voltage Vds of the switch S3 is shown in FIG10B .

[0082] Furthermore, the PWM controller 27 is further configured to control the switch S3 to be turned on or off based on the drive signal of the switch S3. When the switch S3 is turned on, the switch S3 outputs power P to the primary winding Np of the transformer 21. total , at this time the excitation current Ip of the primary winding Np will continue to increase. Among them, the power P total It can be calculated according to the following formula (1).

[0083] In formula (1), L is the inductance of transformer 21, I pm is the peak current of the excitation current Ip, f sw is the switching frequency of the switch S3. When the switch S3 is turned off, the secondary winding Ns of the transformer 21 outputs power P to the first switch group 22a and the first switch group 22n. total At this time, the demagnetization current Im of the primary winding Np and the output current Is of the secondary winding Ns will continue to decrease.

[0084] For example, when the power requirement of the voltage converter 2 is to output two equal target powers, the working timing diagram of the excitation current Ip of the primary winding Np, the demagnetization current Im of the primary winding Np, and the output current Is of the secondary winding Ns is shown in FIG10A. At time point t c1 Previously, the voltage converter 2 operates in continuous conduction mode (CCM) or critical-conduction mode (CRM), where the magnetizing current Ip and the demagnetizing current Im of the primary winding Np are continuous currents. c1Afterwards, the voltage converter 2 operates in a discontinuous conduction mode (DCM), where the excitation current Ip and the demagnetization current Im of the primary winding Np are discontinuous currents. Optionally, the voltage converter 2 may also operate in any one of the CCM mode, the CRM mode, and the DCM mode, without specific limitation herein.

[0085] For example, when the power requirement of the voltage converter 2 is to output two different target powers, the working timing diagram of the excitation current Ip of the primary winding Np, the demagnetization current Im of the primary winding Np, and the output current Is of the secondary winding Ns is shown in FIG10B. At time point t c2 Before, the voltage converter 2 operates in CCM mode or CRM mode, and the excitation current Ip and demagnetization current Im of the primary winding Np are continuous currents. c2 Afterwards, the voltage converter 2 operates in the DCM mode, and the excitation current Ip and the demagnetization current Im of the primary winding Np are discontinuous currents.

[0086] The first switch group 22a and the first switch group 22n receive power P total Next, comparator TL1 is used to obtain a sampled voltage at the first output port out21. It will be appreciated that the sampled voltage at the first output port out21 is the actual output voltage before filtering by inductor L1 and filter capacitor C1. Therefore, the sampled voltage at the first output port out21 will fluctuate within a certain voltage range, allowing dynamic adjustment of the output voltage Vo1 based on the fluctuating sampled voltage. The output voltage Vo1 is the voltage between the first output port out21 and the second output port out3. Comparator TLn is used to obtain a sampled voltage at the first output port out2n. It will be appreciated that the sampled voltage at the first output port out2n is the actual output voltage before filtering by inductor Ln and filter capacitor Cn. Therefore, the sampled voltage at the first output port out2n will fluctuate within a certain voltage range, allowing dynamic adjustment of the output voltage Von based on the fluctuating sampled voltage. The output voltage Von is the voltage between the first output port out2n and the second output port out3.

[0087] Furthermore, the comparator TL1 is further configured to obtain drive signals for the switches S11 and S12 based on a comparison result between the sampled voltage at the first output port out21 and the reference voltage Vref1. The comparator TLn is further configured to obtain drive signals for the switches Sn1 and Sn2 based on a comparison result between the sampled voltage at the first output port out2n and the reference voltage Vrefn. For example, when the power requirement of the voltage converter 2 is to output two identical target powers, the operating timing diagram of the drive signals for the switches S11 and S12, as well as the drive signals for the switches Sn1 and Sn2, is shown in FIG10A . For example, when the power requirement of the voltage converter 2 is to output two different target powers, the operating timing diagram of the drive signals for the switches S11 and S12, as well as the drive signals for the switches Sn1 and Sn2, is shown in FIG10B .

[0088] Furthermore, the comparator TL1 is also used to adjust the on-time of the switches S11 and S12 based on the drive signals of the switches S11 and S12, and to control the switches S11 and S12 to be turned on simultaneously in the first time period of each demagnetization cycle based on the drive signals of the switches S11 and S12, and to control the switches S11 and S12 to be turned off simultaneously in the second time period of each demagnetization cycle based on the drive signals of the switches S11 and S12. The first time period is the time period corresponding to the switches S11 and S12, and the on-time of the switches S11 and S12 is the same as the duration of the first time period. At this time, the switch S12 will output the current I1 and the voltage V to the first output port out21 through the inductor L1. o1 , so that the first switch group 22a outputs the target power P1 to the first output port out21, P1 = I1 * V o1 The comparator TLn is also used to adjust the on-time of the switch Sn1 and the switch Sn2 based on the driving signals of the switch Sn1 and the switch Sn2, control the switch Sn1 and the switch Sn2 to be turned off simultaneously in the first time period of each demagnetization cycle based on the driving signals of the switch Sn1 and the switch Sn2, and control the switch Sn1 and the switch Sn2 to be turned on simultaneously in the second time period of each demagnetization cycle based on the driving signals of the switch Sn1 and the switch Sn2. The second time period is the time period corresponding to the switch Sn1 and the switch Sn2, and the on-time of the switch Sn1 and the switch Sn2 is the same as the length of the second time period. The second time period can be before the first time period or after the first time period. At this time, the switch Sn2 will output the current In and the voltage V to the first output port out2n through the inductor Ln. on , so that the first switch group 22n outputs the target power Pn to the first output port out2n, Pn = In*V on Among them, the voltage V o1 and voltage Von Satisfy the pay-second balance formula, which is shown in formula (2). in *T on =V o1 *T1+V on *T n , formula (2)

[0089] In formula (2), V in is the input voltage of transformer 21, T on is the on-time of switch S3, T1 is the on-time of switch S11 and switch S12, T n is the on-time of the switch Sn1 and the switch Sn2.

[0090] The corresponding relationship between the target power P1 and the target power Pn is shown in formula (3). total =P1+Pn, formula (3)

[0091] In formula (3), according to the principle of energy conservation, the power P can be obtained total Same as the sum of target power P1 and target power Pn.

[0092] For example, when the target power P1 and the target power Pn are the same, the current I1, the current In, and the voltage V o1 and voltage V on The working timing diagram is shown in FIG10A , where Isp1 is the maximum current value of the current I1, Isp1′ is the minimum current value of the current I1, and the voltage V o1 With voltage V on In FIG10A , when the voltage converter 2 operates in CCM mode or CRM mode, the on-time of the switch S3 is T on11 , the demagnetization period of transformer 21 is T off11 When the voltage converter 2 operates in DCM mode, the on-time of the switch S3 is T on21 , the demagnetization period of transformer 21 is T off21 Taking the voltage converter 2 working in CCM mode or CRM mode as an example, some parameters in formula (2) are explained. T1 is the conduction time of switch S11 and switch S12. 11 , and the conduction time of switch S11 and switch S12 is T 11 and demagnetization period T off11 The first time period (t1 to t2) of n is the on-time T of switch Sn1 and switch Sn2 n1, and the on-time of switch Sn1 and switch Sn2 is T n1 and demagnetization period T off11 The second time period (t2-t3) is the same in length.

[0093] For example, when the target power P1 and the target power Pn are different powers, the current I1, the current In, and the voltage V o1 and voltage V on The working timing diagram is shown in FIG10B , where Isp2 is the maximum current value of the current I1, Isp2′ is the minimum current value of the current I1, and the voltage V o1 With voltage V on In FIG10B , when the voltage converter 2 operates in CCM mode or CRM mode, the on-time of the switch S3 is T on12 , the demagnetization period of transformer 21 is T off12 When the voltage converter 2 operates in DCM mode, the on-time of the switch S3 is T on22 , the demagnetization period of transformer 21 is T off22 Taking the voltage converter 2 working in CCM mode or CRM mode as an example, some parameters in formula (2) are explained. T1 is the conduction time T of switch S11 and switch S12. 12 , and the conduction time of switch S11 and switch S12 is T 12 and demagnetization period T off12 The first time period (t4-t5) of n is the on-time T of switch Sn1 and switch Sn2 n2 , and the on-time of switch Sn1 and switch Sn2 is T n2 and demagnetization period T off12 The second time period (t5-t6) is the same in length.

[0094] It can be understood that from Figures 10A and 10B, the demagnetization current Im of the primary winding Np is allocated as current I1 in the first time period of each demagnetization cycle, and the demagnetization current Im of the primary winding Np is allocated as current In in the second time period of each demagnetization cycle. This can achieve time-sharing multiplexing of demagnetization time and demagnetization current in the demagnetization stage of the transformer 21, thereby realizing cycle-by-cycle dual-port power distribution and dual-port voltage distribution, which is more applicable.

[0095] In one embodiment, the voltage converter 2 further includes other functional circuits and electronic components. For example, as shown in FIG11 , the voltage converter 2 shown in FIG8B further includes a capacitor C0, an absorption circuit 26, a switch S3, a resistor R1, a PWM controller 27, diodes D1 to Dn, a rectifier filter circuit 28, and an electromagnetic interference (EMI) filter circuit 29. The diodes D1 to Dn correspond one-to-one to the filter circuits 25a to 25n.

[0096] The input terminal in2 of the transformer 21 includes a sub-input terminal in21 and a sub-input terminal in22. Sub-input terminal in21 of the transformer 21 is connected to the first terminal of the absorption circuit 26. The second terminal of the absorption circuit 26 is connected to one end of capacitor C0 and the output terminal of the rectifier and filter circuit 28. The input terminal of the rectifier and filter circuit 28 is connected to the output terminal of the electromagnetic interference filter circuit 29. Input port in1 includes sub-input port in11 and sub-input port in12. The first input terminal of the electromagnetic interference filter circuit 29 is connected to sub-input port in11, and the second input terminal of the electromagnetic interference filter circuit 29 is connected to sub-input port in12. Sub-input terminal in22 of the transformer 21 is connected to the third terminal of the absorption circuit 26 and the drain of switch S3. The source of switch S3 is grounded via resistor R1, and the gate of switch S3 is connected to the DR pin of the PWM controller 27. The FB pin of the PWM controller 27 is connected to the second terminal of the filter circuit 25a via diode D1, and the FB pin of the PWM controller 27 is connected to the second terminal of the filter circuit 25n via diode Dn. The above is merely an example of the circuit topology of the voltage converter 2 provided in this application, and is not an exhaustive list. This application does not limit the circuit topology of the voltage converter 2.

[0097] It is understandable that the working principle of the voltage converter 2 outputting multiple target powers can be specifically referred to the working principle of the voltage converter 2 outputting two target powers in Figures 9 to 10B, which will not be repeated here.

[0098] In one embodiment, the sub-input port in11 and the sub-input port in12 are used to connect two ends of an AC power supply, and the electromagnetic interference filter circuit 29 is used to suppress conducted interference from the AC power supply and its power line, thereby improving the reliability of the voltage converter 2.

[0099] In one embodiment, the PWM controller 27 may also be integrated into the controller 23 .

[0100] In one embodiment, the controller 23 may also be disposed externally to the voltage converter 2, i.e., the controller 23 and the voltage converter 2 are two independent devices. The controller 23 communicates with the voltage converter 2 via wired or wireless communication to control the voltage converter 2 to output at least two target powers. It should be noted that the specific implementation of the controller 23 controlling the voltage converter 2 to output at least two target powers can be found in the embodiments corresponding to Figures 2A to 11 and will not be further described here.

[0101] In one embodiment, the voltage converter 2 can be used in a power adapter. As shown in FIG12 , the power adapter 12 includes a voltage converter 121 and a protocol chip 122. Exemplarily, the voltage converter 121 can be the voltage converter 2 shown in FIG2A through FIG11 . The protocol chip 122 is configured to detect sampling parameters of the first output port corresponding to each first switch group in the voltage converter 121 and transmit the sampling parameters of the first output port corresponding to each first switch group to a controller in the voltage converter 121. Furthermore, the controller can dynamically adjust the output power of each first switch group based on the sampling parameters of the first output port corresponding to each first switch group, thereby enabling the voltage converter 121 to output at least two target power paths. For specific implementations, see the embodiments corresponding to FIG2A through FIG11 and are not further described here. In this case, the power adapter 12 can power at least two electronic devices based on the at least two target power paths, thereby improving the power supply efficiency of the electronic devices and enhancing their applicability.

[0102] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A voltage converter, characterized in that: The voltage converter comprises an input port, a transformer, at least two first switch groups, at least two first output ports, a second output port and a controller, wherein the at least two first switch groups correspond to the at least two first output ports in a one-to-one manner; The input end of the transformer is connected to the input port, the first output end of the transformer is connected to the input end of each of the at least two first switch groups, the output end of each of the first switch groups is respectively connected to the first output port corresponding to each of the first switch groups, and the second output end of the transformer is connected to the second output port; The controller is used to control each of the at least two first switch groups to output target power to a first output port corresponding to each first switch group within a same demagnetization cycle of the transformer.

2. The voltage converter according to claim 1, characterized in that: The controller is used to obtain sampling parameters of the first output port corresponding to each first switch group, and adjust the conduction time of each first switch group based on the sampling parameters of the first output port corresponding to each first switch group, wherein the sampling parameters include sampling voltage or sampling power.

3. The voltage converter according to claim 2, characterized in that: The controller is used to obtain a drive signal of each first switch group based on a comparison result of the sampling parameter of the first output port corresponding to each first switch group and a reference parameter of the first output port corresponding to each first switch group, and adjust the conduction time of each first switch group based on the drive signal of each first switch group.

4. The voltage converter according to claim 3, characterized in that: The controller comprises at least two comparators, the at least two first switch groups correspond to the at least two comparators one by one, the inverting input end of the comparator corresponding to each first switch group is connected to the output end of each first switch group, and the non-inverting input end of the comparator corresponding to each first switch group is connected to the reference parameter of the first output port corresponding to each first switch group; The comparator corresponding to each switch group is used to obtain the driving signal of each first switch group as a low level when the sampling parameter of the first output port corresponding to each first switch group is greater than the reference parameter of the first output port corresponding to each first switch group; The comparator corresponding to each switch group is also used to obtain the driving signal of each first switch group as a high level when the sampling parameter of the first output port corresponding to each first switch group is less than the reference parameter of the first output port corresponding to each first switch group.

5. The voltage converter according to claim 3 or 4, characterized in that: The same demagnetization cycle of the transformer includes at least two time periods, and the at least two first switch groups correspond one-to-one to the at least two time periods; The controller is used to control each first switch group to be turned on in a time period corresponding to each first switch group based on the driving signal of each first switch group, and to control each first switch group to be turned off in other time periods among the at least two time periods except the time period corresponding to each first switch group based on the driving signal of each first switch group.

6. The voltage converter according to any one of claims 1 to 5, characterized in that: The voltage converter further comprises a second switch group, wherein the second switch group is arranged between the first output terminal of the transformer and the input terminal of each of the first switch groups; The controller is used to control the second switch group to be turned on.

7. The voltage converter according to any one of claims 1 to 6, characterized in that: Each of the first switch groups includes two switches, and the two switches are connected in reverse series.

8. The voltage converter according to any one of claims 1 to 7, characterized in that: The voltage converter further comprises at least two filter circuits, and the at least two first switch groups correspond one to one with the at least two filter circuits; Among them, the output ends of each of the first switch groups are respectively connected to the first connection ends of the filter circuits corresponding to each of the first switch groups, the second connection ends of the filter circuits corresponding to each of the first switch groups are respectively connected to the first output ports corresponding to each of the first switch groups, and the second output end of the transformer is connected to the third connection ends of each of the at least two filter circuits.

9. A controller for a voltage converter, characterized in that: The voltage converter comprises an input port, a transformer, at least two first switch groups, at least two first output ports, and a second output port, wherein the at least two first switch groups correspond to the at least two positive output ports one by one; the input end of the transformer is connected to the input port, the first output end of the transformer is connected to the input end of each of the at least two first switch groups, the output end of each of the first switch groups is respectively connected to the first output port corresponding to each of the first switch groups, and the second output end of the transformer is connected to the second output port; The controller is used to control each of the at least two first switch groups to output target power to a first output port corresponding to each first switch group within a same demagnetization cycle of the transformer.

10. The controller according to claim 9, characterized in that: The controller is used to obtain sampling parameters of the first output port corresponding to each first switch group, and adjust the conduction time of each first switch group based on the sampling parameters of the first output port corresponding to each first switch group, wherein the sampling parameters include sampling voltage or sampling power.

11. The controller according to claim 10, characterized in that: The controller is used to obtain a drive signal of each first switch group based on a comparison result of the sampling parameter of the first output port corresponding to each first switch group and a reference parameter of the first output port corresponding to each first switch group, and adjust the conduction time of each first switch group based on the drive signal of each first switch group.

12. The controller according to claim 11, characterized in that: The controller comprises at least two comparators, the at least two first switch groups correspond to the at least two comparators one by one, the inverting input end of the comparator corresponding to each first switch group is connected to the output end of each first switch group, and the non-inverting input end of the comparator corresponding to each first switch group is connected to the reference parameter of the first output port corresponding to each first switch group; The comparator corresponding to each switch group is used to obtain the driving signal of each first switch group as a low level when the sampling parameter of the first output port corresponding to each first switch group is greater than the reference parameter of the first output port corresponding to each first switch group; The comparator corresponding to each switch group is also used to obtain the driving signal of each first switch group as a high level when the sampling parameter of the first output port corresponding to each first switch group is less than the reference parameter of the first output port corresponding to each first switch group.

13. The controller according to claim 11 or 12, characterized in that: The same demagnetization cycle of the transformer includes at least two time periods, and the at least two first switch groups correspond one-to-one to the at least two time periods; The controller is used to control each first switch group to be turned on in a time period corresponding to each first switch group based on the driving signal of each first switch group, and to control each first switch group to be turned off in other time periods among the at least two time periods except the time period corresponding to each first switch group based on the driving signal of each first switch group.

14. The controller according to any one of claims 9 to 13, characterized in that: The voltage converter further comprises a second switch group, wherein the second switch group is arranged between the first output terminal of the transformer and the input terminal of each of the first switch groups; The controller is used to control the second switch group to be turned on.

15. A power adapter, characterized in that: The power adapter comprises a protocol chip and a voltage converter according to any one of claims 1 to 8; The protocol chip is used to detect the sampling parameters of the first output port corresponding to each first switch group, and send the sampling parameters of the first output port corresponding to each first switch group to the controller.

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