Power comparison module and adapter

Abstract

A power comparison module and an adapter. The power comparison module is used to determine target information corresponding to loops of a plurality of branches in an adapter, the target information being used for indicating the magnitude of a pull current outputted by the loop of each branch; and on the basis of the target information, determine a branch having the largest power gap. Because the pull currents at output ends of the loops of the branches can accurately represent the power gap of each output branch, the branch having the largest power gap can be accurately determined, so that the power comparison module can meet the application requirements of existing adapters.

Description

A power comparison module and adapter

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on September 26, 2023, with application number 202311257375.1 and invention name “A Power Comparison Module and Adapter”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electronic technology, and more specifically, to a power comparison module and an adapter. Background Art

[0003] Among current terminal adapters, multi-port adapters include a single charging head and can simultaneously charge multiple terminal devices. Obviously, since multi-port adapters are popular for their portability, further improving the power density of multi-port adapters can further enhance product competitiveness.

[0004] Current adapters utilize a TDM (time-division multiplexing) control architecture, where the converter's power stage output is connected to the output branches via a multiplexer (MUX). The MUX connects each output branch to the power supply at specific times and replenishes energy. Specifically, the converter incorporates a power determination circuit that determines the power gap required by each output branch. Based on this determination, the MUX connects the path requiring replenishment to the power stage output and feeds the loop output of that path into the PWM IC.

[0005] In the TDM architecture, the power determination circuit plays a key role in arbitration and distribution between different output branches and is the core component of the TDM circuit.

[0006] The current power determination circuit can be shown in Figure 1. Its operating principle is as follows: the power determination circuit reads the output of the loop op amp of each output branch. Based on the operating principle of amplifier-based loop circuits, the larger the op amp output voltage, the larger the power gap. Therefore, the power distribution circuit compares the outputs of each loop op amp, and the branch corresponding to the larger output is the branch that needs to be replenished. The output branch with the larger op amp output voltage, i.e., the larger power gap, is the output branch. The power determination circuit transmits the output voltage of its loop op amp to the feedback terminal of the power stage's PWM IC via a diode (the diodes corresponding to the other branches are reverse biased), allowing the loop to gain control of the power stage. Simultaneously, the input of its power section is connected to the output of the power stage via a multiplexer (MUX), so that the power stage outputs the power output for that output branch.

[0007] However, this circuit can only be used in loops where the power gap can be represented by a level. Currently, most fast-charging protocol ICs use a current source output in their integrated loops to accommodate primary-side and secondary-side isolation control. The specific circuit diagram is shown in Figure 2.

[0008] In this circuit, the anode of the Protocol IC's optocoupler's light-emitting diode is connected to the output bus, while its cathode is connected to a current source, with an impedance network in series. The controller uses the Protocol IC's current source to represent the output power and transmits this control signal to the PWM IC via the optocoupler for closed-loop control. It's easy to understand that in a power supply with multiple output branches, if the output voltages of the output branches differ, then the voltage levels of the Protocol IC's loop port cannot be the same even if the current source is the same. Therefore, the voltage levels of the Protocol IC's loop ports for each output branch cannot be directly compared.

[0009] In short, the current power judgment circuit does not meet the application requirements of this occasion.

[0010] Summary of the Invention

[0011] In the first aspect, the present application provides a power comparison module, which is used to determine the target information corresponding to the loops of multiple branches in the adapter, and the target information is used to represent the pull current output by the loop of each branch; based on the target information, determine the branch with the largest power gap.

[0012] In the embodiment of the present application, the power comparison module can determine the relative size of the power gap of each branch loop by obtaining the current drawn by each branch loop and comparing the current drawn by multiple branches, so as to judge the branch with the largest power gap, and then connect it to the branch by controlling the power level output (that is, controlling the power level output to output power to the output branch). Since the current drawn by the output end of the branch loop can accurately represent the power gap of each output branch, the branch with the largest power gap can be accurately determined, so that the power comparison module can meet the application requirements of the existing adapter.

[0013] In a possible implementation, the power comparison module is further configured to connect the power stage output in the adapter to the branch with the largest power gap by controlling the multiplexer.

[0014] In a possible implementation, the power comparison module is specifically configured to mirror the source current output by the loop of each branch, transmit the mirrored source current to the resistor, and the target information is represented by a voltage drop across the resistor.

[0015] In the above implementation, the source current information is losslessly converted into the voltage drop information of the common ground resistor, which is relatively direct and convenient and does not affect the operation of the Protocol IC.

[0016] In one possible implementation, the power comparison module includes a current mirror and a resistor;

[0017] The power comparison module is configured to mirror the source current output by the loop of the branch through the current mirror, and transmit the mirrored current to the resistor.

[0018] In a possible implementation, the power comparison module is specifically configured to determine a voltage difference between a voltage of the adapter output bus and a voltage of a loop output of a branch circuit, and the target information is represented by the voltage difference.

[0019] In a possible implementation, the power comparison module is specifically configured to determine a voltage difference between a voltage of the adapter output bus and a voltage of a loop output of a branch circuit by using a differential comparator.

[0020] In this way, the relative size of the power gap of each output branch can be obtained by comparing the difference between the output voltage of each output branch and the voltage at the output end of the Protocol IC loop without the need for a current mirror, thereby reducing costs.

[0021] In a possible implementation, the loop of the branch is a control loop whose output is a controllable current source. For example, the loop of the branch is a Protocol IC loop.

[0022] In one possible implementation, the power comparison module is also used to mirror the source current of the branch with the largest power gap when connecting the power level output in the adapter to the branch with the largest power gap, and transmit it to the optocoupler light emitting diode of the adapter through a diode.

[0023] In this way, the current sourced from the feedback terminal of the loop controller of each output branch is mirrored through a current mirror and the mirrored current is input to the control terminal of the power stage in a time-sharing manner. This does not affect the operation of the original protocol IC and can achieve smooth and seamless switching.

[0024] In a second aspect, the present application provides an adapter, comprising:

[0025] Multiple branch loops, power stage outputs, and

[0026] A power comparison module as described in any one of the first aspects.

[0027] In a third aspect, the present application provides a power comparison method, the method comprising:

[0028] Determine target information corresponding to loops of multiple branches in the adapter, where the target information is used to indicate the magnitude of the source current output by the loop of each branch;

[0029] A branch with the largest power gap is determined according to the target information.

[0030] In one possible implementation, the method further includes:

[0031] By controlling the multiplexer, the power stage output in the adapter is connected to the branch with the largest power gap.

[0032] In a possible implementation, determining target information corresponding to loops of multiple branches in the adapter includes:

[0033] The source current of the loop output of each branch is mirrored, and the mirrored source current is transmitted to the resistor, and the target information is represented by the voltage drop across the resistor.

[0034] In a possible implementation, determining target information corresponding to loops of multiple branches in the adapter includes:

[0035] A voltage difference between a voltage of the adapter output bus and a voltage of a loop output of a branch is determined, and the target information is represented by the voltage difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG1 is a schematic diagram of a circuit of an adapter;

[0037] FIG2 is a schematic diagram of a circuit of an adapter;

[0038] FIG3 is a schematic diagram of a process of a power comparison method provided in an embodiment of the present application;

[0039] FIG4 is a schematic diagram of a circuit of an adapter;

[0040] FIG5 is a schematic diagram of a circuit of an adapter;

[0041] FIG6 is a schematic diagram of a circuit of an adapter. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention in conjunction with the accompanying drawings. The terms used in the embodiments of the present invention are only used to explain the specific embodiments of the present invention, and are not intended to limit the present invention.

[0043] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0044] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, and this is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0045] As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation, not as terms of degree, and are intended to take into account the inherent variations in measurements or calculations that one of ordinary skill in the art would recognize. Furthermore, the use of "may" when describing embodiments of the present invention refers to "one or more possible embodiments." As used herein, the terms "use," "using," and "used" may be considered synonymous with the terms "utilize," "utilizing," and "utilized," respectively. Additionally, the term "exemplary" is intended to refer to an example or illustration.

[0046] The following describes some concepts involved in this application:

[0047] (1) Adapter: refers to a device that has a voltage conversion function and supplies power to electronic equipment (also known as terminal equipment). It is also called a charger, switching power supply, charger, or power converter.

[0048] (2) Super Charger: refers to an adapter or charger that can charge a battery-powered device such as a mobile phone or computer quickly, shortening the charging time. It is also commonly called a Super Charger, rapid charger, fast charge, or quick charge.

[0049] (3) Half-bridge: It refers to an electrical topology structure in a switching power supply that uses two power switching tubes to work alternately to achieve power transmission. The main switching bridge is also called the main tube or the first switch; the auxiliary switching bridge is also called the radial tube or the second switch.

[0050] (4) Asymmetric half bridge: The duty cycle of the upper bridge and the lower bridge is not 50% symmetrical.

[0051] (5) Controller IC: refers to the control unit of the product, which implements waveform detection and action logic.

[0052] (6) Transformer: A device in a switching power supply that is responsible for transmitting power and converting voltage.

[0053] (7) Auxiliary winding: The winding in the transformer that is not responsible for power transmission, such as the VCC winding.

[0054] (8) Primary winding: The winding placed on the primary side of the transformer responsible for input voltage and current.

[0055] (9) Secondary winding: The winding placed on the secondary side of the transformer responsible for output voltage and current.

[0056] (10) Power controller (PWM IC): refers to the power control unit of the switching power supply. It directly controls the high-frequency switching of the controllable semiconductor inside the switching power supply between low-resistance state and high-resistance state by issuing high-frequency pulses according to the set control logic, and chops the input energy so that the inductor and capacitor can process the chopped energy.

[0057] (11) Protocol controller (Protocol IC): refers to the protocol control unit of the fast charging product, which is responsible for handshaking with the terminal device, obtaining the voltage and current required by the adapter to output, and modifying the reference voltage value of the loop, thereby changing the loop output and ultimately controlling the operation of the PWM IC; most protocol controllers are integrated with a loop control unit, which completes the change of the loop reference voltage value and the loop output within the IC. The protocol controller in the embodiment of the present application includes two modules: protocol control and loop control. It is not limited to a single integrated IC, but can also refer to a combination of a protocol control IC and a loop control circuit.

[0058] (12) Power stage: In the embodiments of the present application, it refers to the part of the switching power supply circuit that can convert the input energy into rectified but unfiltered energy according to the control signal; specifically, it includes the input and filtering circuit, high-frequency chopper circuit, transformer and its secondary side rectifier circuit, energy storage inductor (integrated with the transformer in some topologies such as flyback and LLC) and PWM IC, etc.

[0059] (13) Output branch: In the embodiments of the present application, it refers to multiple output paths of the converter, each output branch including its own filter capacitor and its corresponding protocol controller.

[0060] (14) Multiplexer (MUX): In the embodiments of the present application, it refers to a circuit or device that selectively connects the secondary rectifier output port of the transformer to the input port of each output branch according to a control signal; if a branch needs to be replenished with energy, it needs to be connected to the secondary rectifier output port of the transformer through a multiplexer.

[0061] (15) Time-division multiplexing (TDM): In the embodiments of the present application, it refers to a multi-channel control method in which each output branch is connected to the power stage in time periods according to a control signal and receives energy supplemented by the power stage.

[0062] (16) Energy packet: In the embodiments of the present application, it refers to the combination of energy output by a power level within several pulses.

[0063] (17) Power gap: In the embodiments of the present application, it refers to the size of the energy packet that each branch needs to be supplemented by the power level, which is represented by the loop output.

[0064] Among current terminal adapters, multi-port adapters include a single charging head and can simultaneously charge multiple terminal devices. Obviously, since multi-port adapters are popular for their portability, further improving the power density of multi-port adapters can further enhance product competitiveness.

[0065] Current adapters utilize a TDM (time-division multiplexing) control architecture, where the converter's power stage output is connected to the output branches via a multiplexer (MUX). The MUX connects each output branch to the power supply at specific times and replenishes energy. Specifically, the converter incorporates a power determination circuit that determines the power gap required by each output branch. Based on this determination, the MUX controls the path requiring replenishment to the power stage output and feeds the loop output of that path into the PWM IC. A typical circuit diagram of this architecture is shown in Figure 1.

[0066] In the TDM architecture, the power determination circuit plays a key role in arbitration and distribution between different output branches and is the core component of the TDM circuit.

[0067] The current power determination circuit can be shown in Figure 1. Its operating principle is as follows: the power determination circuit reads the output voltage of the loop op amp of each output branch. Based on the operating principle of amplifier-based loop circuits, the larger the op amp output voltage, the larger the power gap. Therefore, the power distribution circuit compares the outputs of each loop op amp, and the branch corresponding to the larger output is the branch that needs to be replenished. The output branch with the larger op amp output voltage, i.e., the larger power gap, is the output branch. The power determination circuit transmits the output voltage of its loop op amp to the feedback terminal of the power stage's PWM IC via a diode (the diodes corresponding to the other branches are reverse biased), allowing the loop to gain control of the power stage. Simultaneously, the input of its power section is connected to the output of the power stage via a multiplexing (MUX) circuit, causing the power stage to output power for that output branch.

[0068] However, this circuit can only be used in loops where the power gap can be represented by a level. Currently, most fast-charging protocol ICs use a current source output in their integrated loops to accommodate primary-side and secondary-side isolation control. The specific circuit diagram is shown in Figure 2.

[0069] In this circuit, the anode of the Protocol IC's optocoupler's light-emitting diode is connected to the output bus, while its cathode is connected to a current source, with an impedance network in series. The controller uses the Protocol IC's current source to represent the output power and transmits this control signal to the PWM IC via the optocoupler for closed-loop control. It's easy to understand that in a power supply with multiple output branches, if the output voltages of the output branches differ, then the voltage levels of the Protocol IC's loop port cannot be the same even if the current source is the same. Therefore, the voltage levels of the Protocol IC's loop ports for each output branch cannot be directly compared.

[0070] In short, the current power judgment circuit does not meet the application requirements of this occasion.

[0071] FIG3 is a schematic diagram of a power comparison module 100 provided in an embodiment of the present application, including:

[0072] S310, determining target information corresponding to loops of multiple branches in the adapter, where the target information is used to indicate the source current output by the loop of each branch; and determining a branch with the largest power gap based on the target information.

[0073] The embodiments of the present application can be applied to terminal device adapters, and can also be applied to power supplies such as industrial power supplies and auxiliary power supplies for new energy systems.

[0074] Taking application to an adapter as an example, in a possible implementation, the adapter may include a loop of multiple branches, for example, the loop of the branches is a control loop whose output is a controllable current source, such as a Protocol IC loop.

[0075] In existing implementations, the power comparison module in the adapter can obtain the output voltage of the loop of each branch and determine which output branch to connect the power stage output to based on the comparison of the output voltage of the loop of each branch. However, in order to adapt to the primary and secondary side isolation control, the Protocol IC of most current fast charging circuits uses a current source output for its integrated loop. In this circuit, the anode of the light-emitting diode of the Protocol IC optocoupler is connected to the output bus, and its cathode is connected to the pull current source, with an impedance network connected in series in the middle. The controller characterizes the output power through the pull current of the Protocol IC and transmits the control signal to the PWM IC through the optocoupler to achieve closed-loop control. It is not difficult to understand that in a power supply with multiple output branches, if the output voltages of the output branches are different, then it is obvious that the voltage levels of the loop ports of the Protocol IC cannot be the same when the pull current is the same. Therefore, the voltage levels of the loop ports of the Protocol IC of each output branch cannot be used for direct comparison.

[0076] In the embodiment of the present application, the power comparison module can determine the relative size of the power gap of each branch loop by obtaining the current drawn by each branch loop and comparing the current drawn by multiple branches, so as to judge the branch with the largest power gap, and then connect it to the branch by controlling the power level output (that is, controlling the power level output to output power to the output branch). Since the current drawn by the output end of the branch loop can accurately represent the power gap of each output branch, the branch with the largest power gap can be accurately determined, so that the power comparison module can meet the application requirements of the existing adapter.

[0077] Next, we introduce several ways to obtain the output current of the branch loop.

[0078] Method 1: Implementation through current mirror.

[0079] In a possible implementation, the power comparison module is specifically configured to mirror the source current output by the loop of each branch, transmit the mirrored source current to the resistor, and the target information is represented by a voltage drop across the resistor.

[0080] In a possible implementation, the power comparison module includes a current mirror and a resistor; the power comparison module is configured to mirror the source current output by the loop of the branch through the current mirror, and transmit the mirrored current to the resistor.

[0081] A schematic diagram of the power judgment circuit disclosed in the embodiment of the present application can be shown in the dotted line (MUX_CTRL) box in Figure 4. Specifically, the light-emitting diode of the optocoupler in the existing single-port loop can be replaced with a transistor in a transistor-based current mirror. The BC pole of the transistor is short-circuited. The controller pulls current through the current mirror, and the current mirror outputs a voltage drop on a resistor Rcomp. It is not difficult to understand that if the gain ratio of the current mirror connected to the two outputs is K, then when the corresponding resistors Rcomp1:Rcomp2 = 1 / K, comparing the voltage drops on each branch resistor is directly equivalent to the pull current of each branch. The judgment circuit can thus obtain the power gap information of each branch and connect the output branch with the largest power gap to the power stage output through the MUX.

[0082] In the above implementation, the source current information is losslessly converted into the voltage drop information of the common ground resistor, which is relatively direct and convenient and does not affect the operation of the Protocol IC.

[0083] Method 2: Implementation through differential comparator.

[0084] In a possible implementation, the power comparison module is specifically configured to determine a voltage difference between a voltage of the adapter output bus and a voltage of a loop output of a branch circuit, and the target information is represented by the voltage difference.

[0085] In a possible implementation, the power comparison module is specifically configured to determine a voltage difference between a voltage of the adapter output bus and a voltage of a loop output of a branch circuit by using a differential comparator.

[0086] A schematic diagram of the power judgment circuit disclosed in the embodiment of the present application can be shown in Figure 5, where, compared with Figure 4, the current mirror and resistor of the comparison stage are replaced by a differential comparator, whose inputs are the output bus and the Protocol IC loop output end. Obviously, when the output branches are symmetrical and the loop parameters are the same, the voltage difference between the output bus and the Protocol IC loop output end can represent the source current of the Protocol IC loop output end.

[0087] In this way, the relative size of the power gap of each output branch can be obtained by comparing the difference between the output voltage of each output branch and the voltage at the output end of the Protocol IC loop without the need for a current mirror, thereby reducing costs.

[0088] In addition, to avoid the impact of the switching process on the loop controller, in one possible implementation, the power comparison module is also used to mirror the pull-in current of the branch with the largest power gap when the power level output in the adapter is connected to the branch with the largest power gap, and transmit it to the optocoupler light-emitting diode of the adapter through a diode.

[0089] Figure 6 is a schematic diagram of the loop output stage circuit diagram of the power judgment circuit disclosed in an embodiment of the present application. In order to avoid the impact of the switching process on the loop controller, the circuit again uses a current mirror to mirror the source current of each output branch Protocol IC; when a certain output branch controls the power stage to replenish its energy, the source current mirror of the branch is connected to the optocoupler light emitting diode through a diode, while the source current mirrors of other output branches flow to the control ground through the turned-on MOS.

[0090] In this way, the current sourced from the feedback terminal of the loop controller of each output branch is mirrored through a current mirror and the mirrored current is input to the control terminal of the power stage in a time-sharing manner. This does not affect the operation of the original protocol IC and can achieve smooth and seamless switching.

[0091] In addition, the present application provides a power comparison module, which is used to determine the target information corresponding to the loops of multiple branches in the adapter, and the target information is used to represent the pull current size of the loop output of each branch; based on the target information, determine the branch with the largest power gap.

[0092] The power comparison module can also be described as a power comparison circuit, which can be applied to power supply devices such as adapters or power supplies.

[0093] For a detailed introduction to the power comparison module, please refer to the corresponding embodiment of FIG3 and the introduction of related drawings, and similarities will not be repeated here.

[0094] In one possible implementation, the power comparison module is further configured to control a multiplexer to connect the power stage output in the adapter to the branch with the largest power gap. In another possible implementation, the power comparison module is specifically configured to mirror the source current of the loop output of each branch and transmit the mirrored source current to the resistor, where the target information is represented by a voltage drop across the resistor.

[0095] In a possible implementation, the power comparison module includes a current mirror and a resistor; the power comparison module is configured to mirror the source current output by the loop of the branch through the current mirror, and transmit the mirrored current to the resistor.

[0096] In a possible implementation, the power comparison module is specifically configured to determine a voltage difference between a voltage of the adapter output bus and a voltage of a loop output of a branch circuit, and the target information is represented by the voltage difference.

[0097] In a possible implementation, the power comparison module is specifically configured to determine a voltage difference between a voltage of the adapter output bus and a voltage of a loop output of a branch circuit by using a differential comparator.

[0098] In a possible implementation, the loop of the branch is a control loop whose output is a controllable current source.

[0099] In a possible implementation, the loop of the branch is a Protocol IC loop.

[0100] In one possible implementation, the power comparison module is also used to mirror the source current of the branch with the largest power gap when connecting the power level output in the adapter to the branch with the largest power gap, and transmit it to the optocoupler light emitting diode of the adapter through a diode.

[0101] It should also be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed across multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, in the drawings of the device embodiments provided in this application, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines.

[0102] Through the description of the above embodiments, those skilled in the art can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course can also be implemented by special hardware including application-specific integrated circuits, special CPUs, special memories, special components, etc. In general, all functions performed by computer programs can be easily implemented with corresponding hardware, and the specific hardware structures used to implement the same function can also be diverse, such as analog circuits, digital circuits or special circuits, etc. However, for the present application, software program implementation is a better implementation method in most cases. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer's floppy disk, USB flash drive, mobile hard disk, ROM, RAM, magnetic disk or optical disk, etc., and includes a number of instructions to enable a computer device (which can be a personal computer, training equipment, or network equipment, etc.) to execute the methods described in each embodiment of the present application.

[0103] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0104] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, a computer, a training device or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website, a computer, a training device or a data center. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

Claims

1. A power comparison module, characterized in that: The power comparison module is used to determine the target information corresponding to the loops of the multiple branches in the adapter, and the target information is used to indicate the magnitude of the source current output by the loop of each branch; A branch with the largest power gap is determined according to the target information.

2. The power comparison module according to claim 1, characterized in that: The power comparison module is also used to connect the power level output in the adapter to the branch with the largest power gap by controlling the multiplexer.

3. The power comparison module according to claim 1 or 2, characterized in that: The power comparison module is specifically used to mirror the source current of the loop output of each branch, transmit the mirrored source current to the resistor, and the target information is represented by the voltage drop across the resistor.

4. The power comparison module according to claim 3, characterized in that: The power comparison module includes a current mirror and a resistor; The power comparison module is used for mirroring the source current of the loop output of the branch through the current mirror, and transmitting the mirrored current to the resistor.

5. The power comparison module according to claim 1 or 2, characterized in that: The power comparison module is specifically used to determine the voltage difference between the voltage of the adapter output bus and the voltage of the loop output of the branch, and the target information is represented by the voltage difference.

6. The power comparison module according to claim 5, characterized in that: The power comparison module is specifically used to determine the voltage difference between the voltage of the adapter output bus and the voltage of the loop output of the branch through a differential comparator.

7. The power comparison module according to any one of claims 1 to 6, characterized in that: The loop of the branch is a control loop whose output is a controllable current source.

8. The power comparison module according to any one of claims 1 to 7, characterized in that: The power comparison module is also used to mirror the pull current of the branch with the largest power gap when the power level output in the adapter is connected to the branch with the largest power gap, and transmit it to the optocoupler light emitting diode of the adapter through a diode.

9. An adapter, comprising: Multiple branch loops, power stage outputs, and A power comparison module as claimed in any one of claims 1 to 8.

10. A power comparison method, characterized in that: The method comprises: Determine target information corresponding to loops of multiple branches in the adapter, where the target information is used to indicate the magnitude of the source current output by the loop of each branch; A branch with the largest power gap is determined according to the target information.

11. The method according to claim 10, characterized in that The method further comprises: By controlling the multiplexer, the power stage output in the adapter is connected to the branch with the largest power gap.

12. The method according to claim 10 or 11, characterized in that: The step of determining target information corresponding to loops of multiple branches in the adapter includes: The source current of the loop output of each branch is mirrored, and the mirrored source current is transmitted to the resistor, and the target information is represented by the voltage drop across the resistor.

13. The method according to claim 10 or 11, characterized in that: The step of determining target information corresponding to loops of multiple branches in the adapter includes: The voltage difference between the voltage of the adapter output bus and the voltage of the loop output of the branch is determined, and the target information is represented by the voltage difference.

Images