Output power control system and method, switching power supply and charger chip

Abstract

The invention provides an output power control system and method, a switching power supply and a charger chip. At least two power conversion control devices determine a master device and a power supplementation device, causing the output power control system to enter a power supplementation mode. When the power of the load is larger than the maximum power of the main device and smaller than the sum of the maximum power of the main device and the maximum power of the power supplementing device, the main device and the power supplementing device provide second load power for the load according to the input voltage. Furthermore, the output power of the main device is smaller than the maximum power of the main device, and the output power of the power supplement device is smaller than the maximum power of the power supplement device, so that the output power provided by the main device and the power supplement device to the load is smaller, and heat is dispersed on the main device and the power supplement device. Therefore, the size and the cost of the main device and the power supplement device can be reduced, local hot spots are avoided, and the heat dissipation difficulty and the heat dissipation cost are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power management chips, and in particular to an output power control system, method, switching power supply and charger chip. Background Art

[0002] For a USB charger with multiple USB ports, each USB port usually requires a power supply to complete power conversion and regulation. In this way, each power supply can only output power to the corresponding USB port, and each power supply needs to have the ability to meet the maximum power (i.e. declared power) of the corresponding USB port. When the USB charger has only one USB port connected to the load, only the power supply connected to the load outputs power, and the other power supplies do not output power.

[0003] However, since each power supply is responsible for the declared power of the corresponding USB interface, the power of each power supply is relatively large. As a result, the cost and volume of each power supply are relatively high. At the same time, when a power supply is fully loaded, the heat is concentrated on the components of this power supply, causing local hot spots. As a result, the difficulty and cost of heat dissipation are increased. Summary of the invention

[0004] The present application provides an output power control system, method, switching power supply and charger chip, which can reduce the cost and volume of a power conversion control device, and reduce the difficulty and cost of heat dissipation.

[0005] In a first aspect, the present application provides an output power control system, the output power control system comprising: at least two power conversion control devices and at least two USB ports; the power input end of each of the power conversion control devices is used to access the input voltage, the parallel communication ends of each of the power conversion control devices are electrically connected to each other, the power supplement ends of each of the power conversion control devices are electrically connected to each other, the power output end and the load communication end of each of the power conversion control devices are electrically connected to each of the USB ports one by one, and each of the USB ports is also used to access the load;

[0006] The at least two power conversion control devices are used to determine a main device and a power supplement device, and the power supplement device is used to supplement power to the main device;

[0007] In the case where the voltage of the load is greater than or equal to the minimum output voltage of the main device and the power compensation device, and less than or equal to the maximum output voltage, when the power of the load is less than the maximum power of the main device, the main device is used to provide a first load power to the load according to the input voltage, and the first load power is the output power of the main device;

[0008] When the power of the load is greater than the maximum power of the main device and less than the sum of the maximum power of the main device and the maximum power of the power supplement device, the main device and the power supplement device are both used to provide a second load power to the load according to the input voltage, and the second load power is the sum of the output power of the main device and the output power of the power supplement device.

[0009] Through the output power control system provided by the first aspect, at least two power conversion control devices can determine the main device and the power supplement device for supplementing power to the main device, so that the output power control system enters the power supplement mode. In this way, when the voltage of the load is greater than or equal to the minimum output voltage of the main device and the power compensation device, and less than or equal to the maximum output voltage, when the power of the load is less than the maximum power of the main device, the main device can provide the first load power to the load according to the input voltage, that is, the first load power is only provided by the output power of the main device. In this way, the output power of the main device is less than the maximum power of the main device, and the main device is in a fully loaded working state. Furthermore, the output power provided by the main device to the load is small, and the heat cannot be concentrated on the main device. When the power of the load is greater than the maximum power of the main device, and less than the sum of the maximum power of the main device and the maximum power of the power supplement device, both the main device and the power supplement device can provide the second load power to the load according to the input voltage, that is, the second load power is provided by the output power of the main device and the output power of the power supplement device. Furthermore, the output power of the main device is less than the maximum power of the main device, and the output power of the power supplement device is less than the maximum power of the power supplement device, so that the output power provided by the main device and the power supplement device to the load is relatively small, and the heat is dispersed on the main device and the power supplement device. Therefore, the volume and cost of the main device and the power supplement device can be reduced, and the existence of local hot spots can be avoided, reducing the difficulty and cost of heat dissipation.

[0010] In one possible design, the at least two power conversion control devices are used to, when the number of the load is 1, determine the power conversion control device with the maximum output voltage among the power conversion control device connected to the load and the power conversion control device not connected to the load as the main device, and determine the other power conversion control devices among the power conversion control device connected to the load and the power conversion control device not connected to the load except the power conversion control device with the maximum output voltage as the power supplement device;

[0011] or,

[0012] The at least two power conversion control devices are used to determine a first power conversion control device among multiple power conversion control devices connected to the loads when the number of the loads is at least 2, and determine the power conversion control device with the maximum output voltage among the first power conversion control device and the power conversion control devices not connected to the loads as the main device, and determine the other power conversion control devices among the first power conversion control device and the power conversion control devices not connected to the loads except the power conversion control device with the maximum output voltage as the power supplement devices.

[0013] In a possible design, the power conversion control device includes: a power conversion circuit, a drive signal output circuit, a program control circuit, a switch circuit and a sampling circuit;

[0014] The input end of the power conversion circuit is used to access the input voltage, the output end of the power conversion circuit is electrically connected to the input end of the sampling circuit and the input end of the switch circuit respectively, the output end of the sampling circuit is electrically connected to the input end of the program control circuit and the first input end of the drive signal output circuit respectively, the load communication end of the program control circuit and the first output end of the switch circuit are both electrically connected to the USB port, the second output end of the switch circuit is the power supplement end of the power conversion control device, the first output end of the program control circuit is electrically connected to the control end of the switch circuit, the second output end of the program control circuit is electrically connected to the second input end of the drive signal output circuit, the online communication end of the program control circuit is the parallel communication end of the power conversion control device, and the output end of the drive signal output circuit is electrically connected to the control end of the power conversion circuit;

[0015] In the case where the power conversion control device is the main device or the power supplement device, wherein:

[0016] The power conversion circuit is used to convert the input voltage to obtain the output power under the action of a driving signal, and the driving signal is used to drive the switch tube in the power conversion circuit to be turned on or off;

[0017] The sampling circuit is used to collect the output power to obtain the sampled power, and transmit the sampled power to the drive signal output circuit and the program control circuit respectively;

[0018] The program control circuit is used to communicate with the main device or the power supplement device to obtain a first communication result, and obtain a maximum power according to the first communication result and the sampled power, and transmit the maximum power to the drive signal output circuit;

[0019] The driving signal output circuit is used to obtain the driving signal according to the sampled power and the maximum power, and transmit the driving signal to the power conversion circuit;

[0020] The program control circuit is also used to communicate with the USB port to determine whether the load is connected, obtain a second communication result, and control the on and off of the switch tube in the switching circuit according to the first communication result and the second communication result, so that the power conversion control device is the main device or the power supplement device.

[0021] In one possible design, the drive signal output circuit includes: a power control circuit and a control voltage output circuit;

[0022] The first input end of the control voltage output circuit is electrically connected to the output end of the sampling circuit, the second input end of the control voltage output circuit is electrically connected to the second output end of the program control circuit, the output end of the control voltage output circuit is electrically connected to the input end of the power control circuit, and the output end of the power control circuit is electrically connected to the control end of the power conversion circuit;

[0023] The control voltage output circuit is used to obtain a control voltage according to the sampled power and the maximum power, and transmit the control voltage to the power control circuit;

[0024] The power control circuit is used to generate the driving signal according to the control voltage.

[0025] In one possible design, the control voltage output circuit includes: a first error amplifier, a second error amplifier and a diode group;

[0026] The inverting input terminal of the first error amplifier and the inverting input terminal of the second error amplifier are both electrically connected to the output terminal of the sampling circuit, the non-inverting input terminal of the first error amplifier and the non-inverting input terminal of the second error amplifier are both electrically connected to the second output terminal of the program control circuit, the output terminal of the first error amplifier and the output terminal of the second error amplifier are both electrically connected to the cathode of the diode group, and the anode of the diode group is electrically connected to the input terminal of the power control circuit;

[0027] The first error amplifier is used to amplify the current difference between the sampling current in the sampling power and the reference current in the maximum power to obtain a first voltage, and transmit the first voltage to the diode group;

[0028] The second error amplifier is used to amplify the voltage difference between the sampled voltage in the sampled power and the reference voltage in the maximum power to obtain a second voltage, and transmit the second voltage to the diode group;

[0029] The diode group is used to generate the control voltage according to the first voltage and the second voltage.

[0030] In one possible design, the sampling circuit includes: a current sampling circuit and a voltage sampling circuit;

[0031] The input end of the current sampling circuit is used to collect the output current in the output power, the input end of the voltage sampling circuit is electrically connected to the output end of the power conversion circuit, and the output end of the current sampling circuit and the output end of the voltage sampling circuit are both electrically connected to the first input end of the drive signal output circuit;

[0032] The current sampling circuit is used to collect the output current to obtain the sampled current in the sampled power;

[0033] The voltage sampling circuit is used to collect the output voltage in the output power to obtain the sampled voltage in the sampled power.

[0034] In a possible design, the switch circuit includes: a first switch tube and a second switch tube;

[0035] The first end of the first switch tube and the first end of the second switch tube are both electrically connected to the output end of the power conversion circuit, the control end of the first switch tube and the control end of the second switch tube are both electrically connected to the first output end of the program control circuit, the second end of the first switch tube is electrically connected to the USB port, and the second end of the second switch tube is the second output end of the switch circuit.

[0036] In a second aspect, the present application provides an output power control method, which is performed by an output power control system in the first aspect and each possible design of the first aspect, wherein the output power control system comprises: at least two power conversion control devices and at least two USB ports; the power input end of each of the power conversion control devices is used to access an input voltage, the parallel communication end of each of the power conversion control devices is electrically connected to each other, the power supplement end of each of the power conversion control devices is electrically connected to each other, the power output end and the load communication end of each of the power conversion control devices are electrically connected to each of the USB ports one by one, and each of the USB ports is also used to access a load; the method comprises:

[0037] When the voltage of the load is greater than or equal to the minimum output voltage of the main device and the power compensation device, and less than or equal to the maximum output voltage, when the power of the load is less than the maximum power of the main device, the main device provides a first load power to the load according to the input voltage, and the first load power is the output power of the main device;

[0038] When the power of the load is greater than the maximum power of the main device and less than the sum of the maximum power of the main device and the maximum power of the power supplement device, the main device and the power supplement device both provide a second load power to the load based on the input voltage, and the second load power is the sum of the output power of the main device and the output power of the power supplement device.

[0039] The beneficial effects of the methods provided in the above-mentioned second aspect and each possible design of the above-mentioned second aspect can be referred to the beneficial effects brought about by the above-mentioned first aspect and each possible implementation method of the first aspect, and will not be repeated here.

[0040] In a third aspect, the present application provides a switching power supply, comprising: an AC-DC converter and an output power control system in the first aspect and in each possible design of the first aspect.

[0041] In a fourth aspect, the present application provides a charger chip, including the output power control system in the above-mentioned first aspect and each possible design of the above-mentioned first aspect, and / or the switching power supply in the above-mentioned third aspect.

[0042] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic diagram of the structure of an output power control system provided in one embodiment of the present application;

[0045] Figure 2 A schematic diagram of a flow chart of an output power control method provided in one embodiment of the present application;

[0046] Figure 3 A schematic diagram of output power of an output power control system provided in one embodiment of the present application;

[0047] Figure 4 A schematic diagram of the structure of a power conversion control device in an output power control system provided in one embodiment of the present application;

[0048] Figure 5 A control flow diagram of an output power control system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0049] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0050] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0051] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of an output power control system provided by an embodiment of the present application. Figure 1 As shown, the output power control system 1000 may include: at least two power conversion control devices and at least two USB ports; the power input terminal of each power conversion control device 100 is used to access the input voltage VIN, the parallel communication terminal of each power conversion control device 100 is electrically connected, the power supplement terminal of each power conversion control device 100 is electrically connected, the power output terminal and the load communication terminal of each power conversion control device 100 are electrically connected to each USB port one by one, and each USB port is also used to connect to a load.

[0053] Figure 1 In the figure, the power input terminal of the power conversion control device 100 is recorded as 1, the parallel communication terminal of the power conversion control device 100 is recorded as 2, the power output terminal of the power conversion control device 100 is recorded as 3, the load communication terminal of the power conversion control device 100 is recorded as 4, and the power supplement terminal of the power conversion control device 100 is recorded as 5.

[0054] Below, refer to Figure 2 , Figure 2 A flowchart of an output power control method provided in one embodiment of the present application.

[0055] S101. At least two power conversion control devices determine a main device and a power supplement device.

[0056] The power supplement device is used to supplement power to the main device.

[0057] When the load voltage is greater than or equal to the minimum output voltage of the main device and the power compensation device, and less than or equal to the maximum output voltage:

[0058] S102: When the power of the load is less than the maximum power of the main device, the main device provides a first load power to the load according to the input voltage.

[0059] S102: When the power of the load is greater than the maximum power of the main device and less than the sum of the maximum power of the main device and the maximum power of the power supplement device, the main device and the power supplement device both provide a second load power to the load according to the input voltage.

[0060] For ease of explanation, at least two power conversion control devices in the embodiments of the present application are described by taking N power conversion control devices 100 as an example, where N>=2.

[0061] At least two power conversion control devices can determine the main device and the power supplement device, so that the output power control system 1000 enters the power supplement mode.

[0062] The power supplement device is used to supplement power to the main device.

[0063] In this way, when the voltage of the load is greater than or equal to the minimum output voltage Vout of the main device and the power compensation device, and less than or equal to the maximum output voltage Vout, when the power of the load is less than the maximum power of the main device, the main device can provide the first load power to the load according to the input voltage VIN. In other words, the first load power is only borne by the main device, and the power supplement device is in a non-loaded working state.

[0064] The main device is in a constant voltage output mode, and the voltage of the load is determined by the main device.

[0065] In this way, the output power of the main device is less than the maximum power of the main device, so that the power provided by the main device to the load is smaller, thereby reducing the size and cost of the main device.

[0066] In addition, compared with the current sharing control method, only the main device bears the first load power, and the power supplement device is in a no-load working state, which can improve the light-load efficiency of the main device.

[0067] At the same time, the main device is in a non-full load working state, so that the heat cannot be concentrated on the main device, thereby avoiding the existence of local hot spots and reducing the difficulty and cost of heat dissipation.

[0068] The first load power is the output power of the main device.

[0069] When the power of the load is greater than the maximum power of the main device and less than the sum of the maximum power of the main device and the maximum power of the power supplement device, the main device and the power supplement device can both provide the second load power to the load according to the input voltage VIN. In other words, the second load power is shared by the main device and the power supplement device. At this time, the power supplement device plays a role of power supplement.

[0070] The number of power supplement devices may be one or more, and the embodiment of the present application does not specifically limit this. When the number of power compensation devices is more than one, the last power supplement device in the power supplement device is in a constant voltage output mode, and the main device and the power supplement devices other than the last power supplement device are in a constant current output mode, and the voltage of the load is determined by the last power supplement device in the power supplement device.

[0071] In this way, the output power of the main device is less than the maximum power of the main device, and the output power of the power supplement device is less than the maximum power of the power supplement device, so that the output power provided by the main device and the power supplement device to the load is relatively small. Thus, the cost and volume of the main device and the power supplement device can be reduced. At the same time, the heat can be dispersed on the main device and the power supplement device. Furthermore, it is possible to avoid heat concentration on the main device or the power supplement device, and avoid the existence of local hot spots. Thus, the difficulty and cost of heat dissipation can be reduced.

[0072] The second load power is the sum of the output power of the main device and the output power of the power supplement device.

[0073] The output power control system, method, switching power supply, chip and electronic device provided by the present application, at least two power conversion control devices can determine the main device and the power supplement device for supplementing the power of the main device, so that the output power control system enters the power supplement mode. In this way, when the voltage of the load is greater than or equal to the minimum output voltage of the main device and the power compensation device, and less than or equal to the maximum output voltage, when the power of the load is less than the maximum power of the main device, the main device can provide the first load power to the load according to the input voltage, that is, the first load power is only provided by the output power of the main device. In this way, the output power of the main device is less than the maximum power of the main device, and the main device is in a fully loaded working state. Furthermore, the output power provided by the main device to the load is small, and the heat cannot be concentrated on the main device. When the power of the load is greater than the maximum power of the main device, and less than the sum of the maximum power of the main device and the maximum power of the power supplement device, both the main device and the power supplement device can provide the second load power to the load according to the input voltage, that is, the second load power is provided by the output power of the main device and the output power of the power supplement device. Furthermore, the output power of the main device is less than the maximum power of the main device, and the output power of the power supplement device is less than the maximum power of the power supplement device, so that the output power provided by the main device and the power supplement device to the load is relatively small, and the heat is dispersed on the main device and the power supplement device. Therefore, the volume and cost of the main device and the power supplement device can be reduced, and the existence of local hot spots can be avoided, reducing the difficulty and cost of heat dissipation.

[0074] The following describes in detail how at least two power conversion control devices determine the main device and the power supplement device. The content is as follows:

[0075] For the case where the number of loads is 1, at least two power conversion control devices are arranged in order of output voltage from large to small. In this way, the power conversion control device connected to the load and the power conversion control device not connected to the load are power conversion control device 101-1, power conversion control device 101-2 to power conversion control device 101-N, respectively. Furthermore, at least two power conversion control devices can determine the power conversion control device with the maximum output voltage among the power conversion control device connected to the load and the power conversion control device not connected to the load, that is, power conversion control device 101-1 as the main device. In addition, at least two power conversion control devices can determine the other power conversion control devices except the power conversion control device with the maximum output voltage among the power conversion control device connected to the load and the power conversion control device not connected to the load, that is, power conversion control device 101-2 to power conversion control device 101-N as power supplement devices.

[0076] Thus, for example, when the load power is less than the maximum power of the power conversion control device 101-1, the power conversion control device 101-1 provides the first load power to the load. The load voltage is determined by the power conversion control device 101-1, and at this time, the power conversion control device 101-1 is in a constant voltage output mode.

[0077] For example, refer to Figure 3 , Figure 3 This is a schematic diagram of an output power control system provided by an embodiment of the present application. Figure 3 As shown, when the power of the load is greater than the maximum power of the power conversion control device 101-1 and less than the sum of the maximum power of the power conversion control device 101-1 and the maximum power of the power conversion control device 101-2, the power conversion control device 101-1 and the power conversion control device 101-2 jointly provide the second load power to the load. In other words, the second load power is the sum of the output power of the power conversion control device 101-1 and the output power of the power conversion control device 101-2, that is, POUT=POUT101-1+POUT101-2.

[0078] Wherein, POUT is the second load power, POUT101 - 1 is the output power of the power conversion control device 101 - 1 , and POUT101 - 2 is the output power of the power conversion control device 101 - 2 .

[0079] The voltage of the load is determined by the power conversion control device 101 - 2 . At this time, the power conversion control device 101 - 2 is in a constant voltage output mode, and the power conversion control device 101 - 1 is in a constant current output mode.

[0080] The output power of the power conversion control device 101 - 2 plays a role in power supplement.

[0081] For another example, when the power of the load is greater than the sum of the maximum power of the power conversion control device 101-1 and the maximum power of the power conversion control device 101-2, and less than the sum of the maximum power of the power conversion control device 101-1, the maximum power of the power conversion control device 101-2 and the maximum power of the power conversion control device 101-3, the power conversion control device 101-1, the power conversion control device 101-2 and the power conversion control device 101-3 jointly provide a second load power to the load.

[0082] The voltage of the load is determined by the power conversion control device 101 - 3 . At this time, the power conversion control device 101 - 3 is in a constant voltage output mode, and the power conversion control devices 101 - 1 and 101 - 2 are in a constant current output mode.

[0083] The output power of the power conversion control device 101 - 2 and the output power of the power conversion control device 101 - 3 play a role of power supplement.

[0084] Based on this, as the power of the load gradually increases, the power conversion control devices 101-4 to 101-N will sequentially participate in the work of jointly providing the second load power to the load. In other words, the power conversion control devices 101-4 to 101-N will sequentially participate in power supplementation.

[0085] The voltage of the load is determined by the power conversion control device 101-4 to the power conversion control device 101-N in sequence, and the power conversion control device 101-3 to the power conversion control device 101-(N-1) will enter the constant current output mode in sequence. The power conversion control device 101-4 to the power conversion control device 101-N will enter the constant voltage output mode in sequence.

[0086] When the number of loads is at least 2, the multiple power conversion control devices connected to the loads communicate through the corresponding parallel communication terminals to determine that one of the multiple power conversion control devices connected to the loads is the first power conversion control device 101-bb. In this way, at least two power conversion control devices can determine the first power conversion control device 101-bb among the multiple power conversion control devices connected to the loads.

[0087] For example, there are a total of m power conversion control devices including the first power conversion control device 101-bb and the power conversion control devices without load connected (where N - 1 >= m >= 2, 1 <= k <= m, and k represents a certain one of the m devices). And the first power conversion control device 101-bb and the power conversion control devices without load connected are arranged in descending order of output voltage. Thus, the first power conversion control device 101-bb and the power conversion control devices without load connected are successively the power conversion control device 101-a1, the power conversion control device 101-a2 to the power conversion control device 101-am. Furthermore, at least two power conversion control devices can determine the power conversion control device with the maximum output voltage among the first power conversion control device 101-bb and the power conversion control devices without load connected, that is, the power conversion control device 101-a1, as the master device, and determine the other power conversion control devices except the power conversion control device with the maximum output voltage among the first power conversion control device 101-bb and the power conversion control devices without load connected, that is, the power conversion control device 101-a2 to the power conversion control device 101-am, as the power supplement devices.

[0088] Thus, for example, when the power of the load, that is, the load power of the first power conversion control device 101-bb, is less than the maximum power of the power conversion control device 101-a1, the power conversion control device 101-a1 provides the first load power to the load.

[0089] Among them, the voltage of the load is determined by the power conversion control device 101-1. At this time, the power conversion control device 101-1 is in the constant voltage output mode.

[0090] For another example, when the load power of the first power conversion control device 101-bb is greater than the maximum power of the power conversion control device 101-a1 and less than the sum of the maximum power of the power conversion control device 101-a1 and the maximum power of the power conversion control device 101-a2, the power conversion control device 101-a1 and the power conversion control device 101-a2 jointly provide the second load power to the load.

[0091] Among them, the voltage of the load is determined by the power conversion control device 101-a2. At this time, the power conversion control device 101-a2 is in the constant voltage output mode, and the power conversion control device 101-a1 is in the constant current output mode.

[0092] Among them, the output power of the power conversion control device 101-a2 plays a role in power supplement.

[0093] For another example, when the power of the load is greater than the sum of the maximum power of the power conversion control device 101-a1 and the maximum power of the power conversion control device 101-a2, and less than the sum of the maximum power of the power conversion control device 101-a1, the maximum power of the power conversion control device 101-a2 and the maximum power of the power conversion control device 101-a3, the power conversion control device 101-a1, the power conversion control device 101-a2 and the power conversion control device 101-a3 jointly provide a second load power to the load.

[0094] Among them, the voltage of the load is determined by the power conversion control device 101-a3. At this time, the power conversion control device 101-a3 is in a constant voltage output mode, and the power conversion control device 101-a1 and the power conversion control device 101-a2 are in a constant current output mode.

[0095] Among them, the output power of the power conversion control device 101 - a2 and the output power of the power conversion control device 101 - a3 play a role of power supplement.

[0096] Based on this, as the power of the load gradually increases, the power conversion control device 101-a4 to the power conversion control device 101-am will sequentially participate in the work of jointly providing the second load power to the load. In other words, the power conversion control device 101-a4 to the power conversion control device 101-am will sequentially participate in power supplementation.

[0097] The voltage of the load is determined by the power conversion control device 101-a4 to the power conversion control device 101-am in turn, and the power conversion control device 101-a3 to the power conversion control device 101-a(m-1) will enter the constant current output mode in turn. The power conversion control device 101-a4 to the power conversion control device 101-am will enter the constant voltage output mode in turn.

[0098] In summary, when the number of loads is 1, at least two power conversion control devices can determine the power conversion control device with the maximum output voltage among the power conversion control devices connected to the load and the power conversion control devices not connected to the load as the main device, and determine the other power conversion control devices except the power conversion control device with the maximum output voltage among the power conversion control devices connected to the load and the power conversion control devices not connected to the load as power supplement devices. Alternatively, when the number of loads is at least 2, at least two power conversion control devices can determine the first power conversion control device among multiple power conversion control devices connected to the load, and determine the power conversion control device with the maximum output voltage among the first power conversion control device and the power conversion control devices not connected to the load as the main device, and determine the other power conversion control devices except the power conversion control device with the maximum output voltage among the first power conversion control device and the power conversion control devices not connected to the load as power supplement devices. Thus, at least two power conversion control devices can determine the main device and the power supplement device.

[0099] Based on the description of the above embodiment, a possible implementation of the power conversion control device 100 is exemplified. Figure 4 , Figure 4 This is a schematic diagram of the structure of a power conversion control device in an output power control system provided by an embodiment of the present application. Figure 4 As shown, the power conversion control device 100 may include: a power conversion circuit 110 , a drive signal output circuit 120 , a program control circuit 130 , a switch circuit 140 and a sampling circuit 150 .

[0100] The input end of the power conversion circuit 110 is used to access the input voltage VIN, the output end of the power conversion circuit 110 is electrically connected to the input end of the sampling circuit 150 and the input end of the switch circuit 140 respectively, the output end of the sampling circuit 150 is electrically connected to the input end of the program control circuit 130 and the first input end of the drive signal output circuit 120 respectively, the load communication end of the program control circuit 130 and the first output end of the switch circuit 140 are both electrically connected to the USB port, the second output end of the switch circuit 140 is the power supplement end of the power conversion control device 100, the first output end of the program control circuit 130 is electrically connected to the control end of the switch circuit 140, the second output end of the program control circuit 130 is electrically connected to the second input end of the drive signal output circuit 120, the online communication end of the program control circuit 130 is the parallel communication end of the power conversion control device 100, and the output end of the drive signal output circuit 120 is electrically connected to the control end of the power conversion circuit 110.

[0101] Among them, the power conversion circuit 110, the drive signal output circuit 120, the program control circuit 130, the switch circuit 140 and the sampling circuit 150 can be set separately or integrated, and the embodiment of the present application does not make specific limitations on this.

[0102] Among them, the input end of the power conversion circuit 110 is the power input end of the power conversion control device 100, the online communication end of the program control circuit 130 is the parallel communication end of the power conversion control device 100, the first output end of the switch circuit 140 is the power output end of the power conversion control device 100, the second output end of the switch circuit 140 is the power supplement end of the power conversion control device 100, and the load communication end of the program control circuit 130 is the load communication end of the power conversion control device 100.

[0103] Figure 4 In the figure, the input end of the power conversion circuit 110 is recorded as 1, the output end of the power conversion circuit 110 is recorded as 2, the input end of the switch circuit 140 is recorded as 1, the first output end of the switch circuit 140 is recorded as 2, the second output end of the switch circuit 140 is recorded as 3, the input end of the program control circuit 130 is recorded as 1, the load communication end of the program control circuit 130 is recorded as 2, the first output end of the program control circuit 130 is recorded as 3, the second output end of the program control circuit 130 is recorded as 4, and the online communication end of the program control circuit 130 is recorded as 5. Among them, the input terminal of the program control circuit 130 for connecting to the sampling current IFB is recorded as 1-1, the input terminal of the program control circuit 130 for connecting to the sampling voltage VFB is recorded as 1-2, the first output terminal of the program control circuit 130 for controlling the first switch tube S1 is recorded as 3-1, the first output terminal of the program control circuit 130 for controlling the second switch tube S2 is recorded as 3-2, the second output terminal of the program control circuit 130 for outputting the reference voltage Vref is recorded as 4-1, and the second output terminal of the program control circuit 130 for outputting the reference current Iref is recorded as 4-2.

[0104] In the case where the power conversion control device 100 is a main device or a power supplement device, wherein:

[0105] Under the action of the driving signal, the power conversion circuit 110 can convert the input voltage VIN to obtain output power, so that the main device or the power supplement device can obtain the output power.

[0106] The driving signal is used to drive the switch in the power conversion circuit 110 to turn on or off.

[0107] The sampling circuit 150 can collect the output power to obtain the sampled power. In addition, the sampling circuit 150 can transmit the sampled power to the drive signal output circuit 120 and the program control circuit 130 respectively, so that the drive signal output circuit 120 and the program control circuit 130 can obtain the sampled power.

[0108] The program control circuit 130 can communicate with the main device or the power supplement device to obtain a first communication result. In addition, the program control circuit 130 can obtain the maximum power according to the first communication result and the sampled power, and transmit the maximum power to the drive signal output circuit 120, so that the drive signal output circuit 120 can obtain the maximum power.

[0109] When the power conversion control device 100 is a master device, the program control circuit 130 can communicate with the power supplement device to obtain a first communication result. When the power conversion control device 100 is a power supplement device, the program control circuit 130 can communicate with the master device to obtain a first communication result.

[0110] The drive signal output circuit 120 can obtain a drive signal according to the sampled power and the maximum power. In addition, the drive signal output circuit 120 can transmit the drive signal to the power conversion circuit 110 so that the power conversion circuit 110 can obtain the drive signal and convert the input voltage VIN.

[0111] The program control circuit 130 can communicate with the USB port to determine whether the load is connected and obtain a second communication result. In addition, the program control circuit 130 can control the on and off of the switch tube in the switch circuit 140 according to the first communication result and the second communication result, so that the power conversion control device 100 is a main device or a power supplement device.

[0112] In summary, under the action of the driving signal, the power conversion circuit can convert the input voltage to obtain the output power, so that the main device or the power supplement device can obtain the output signal. The sampling circuit can collect the output power to obtain the sampled power, and transmit the sampled power to the driving signal output circuit and the program control circuit respectively, so that the driving signal output circuit and the program control circuit can obtain the sampled power. The program control circuit can communicate with the main device or the power supplement device to obtain the first communication result. In addition, the program control circuit can obtain the maximum power according to the first communication result and the sampled power, and transmit the maximum power to the driving signal output circuit, so that the driving signal output circuit can obtain the maximum power. In this way, the driving signal output circuit can obtain the driving signal according to the sampled power and the maximum power, and transmit the driving signal to the power conversion circuit. The program control circuit communicates with the USB port to determine whether the load is connected, obtains the second communication result, and controls the on and off of the switch tube in the switch circuit according to the first communication result and the second communication result. Thus, the main device or the power supplement device can obtain the output power to provide the first load power or the second load power to the load.

[0113] Based on the description of the above embodiment, a possible implementation of the driving signal output circuit 120 is exemplified. Figure 4 As shown, the driving signal output circuit 120 may include: a power control circuit 121 and a control voltage output circuit 122 .

[0114] The first input end of the control voltage output circuit 122 is electrically connected to the output end of the sampling circuit 150, the second input end of the control voltage output circuit 122 is electrically connected to the second output end of the program control circuit 130, the output end of the control voltage output circuit 122 is electrically connected to the input end of the power control circuit 121, and the output end of the power control circuit 121 is electrically connected to the control end of the power conversion circuit 110.

[0115] Among them, the first input end of the control voltage output circuit 122 is the first input end of the drive signal output circuit 120, the second input end of the control voltage output circuit 122 is the second input end of the drive signal output circuit 120, and the output end of the power control circuit 121 is the output end of the drive signal output circuit 120.

[0116] The control voltage output circuit 122 can obtain the control voltage FB according to the sampled power and the maximum power. Furthermore, the control voltage output circuit 122 can transmit the control voltage FB to the power control circuit 121 so that the power control circuit 121 can obtain the control voltage FB.

[0117] In this way, the power control circuit 121 can generate a driving signal according to the control voltage FB. Thus, the driving signal output circuit 120 can obtain a driving signal according to the sampled power and the maximum power.

[0118] Among them, components such as inductors and capacitors inside the power control circuit 121 participate in the power conversion and transmission of the power conversion circuit 110 .

[0119] In summary, the control voltage output circuit can obtain the control voltage according to the sampled power and the maximum power, and transmit the control voltage to the power control circuit so that the power control circuit can obtain the control voltage. Thus, the power control circuit can generate a drive signal according to the control voltage so that the drive signal output circuit can obtain the drive signal.

[0120] Based on the description of the above embodiment, a possible implementation of the control voltage output circuit 122 is exemplified. Figure 4 As shown, the control voltage output circuit 122 may include: a first error amplifier EA1 , a second error amplifier EA2 , and a diode group.

[0121] The inverting input terminal of the first error amplifier EA1 and the inverting input terminal of the second error amplifier EA2 are both electrically connected to the output terminal of the sampling circuit 150, the non-inverting input terminal of the first error amplifier EA1 and the non-inverting input terminal of the second error amplifier EA2 are both electrically connected to the second output terminal of the program control circuit 130, the output terminal of the first error amplifier EA1 and the output terminal of the second error amplifier EA2 are both electrically connected to the cathode of the diode group, and the anode of the diode group is electrically connected to the input terminal of the power control circuit 121.

[0122] Among them, the inverting input terminal of the first error amplifier EA1 and the inverting input terminal of the second error amplifier EA2 are both the first input terminal of the control voltage output circuit 122, the same-direction input terminal of the first error amplifier EA1 and the same-direction input terminal of the second error amplifier EA2 are both the second input terminal of the control voltage output circuit 122, and the first end of the first resistor R1 is the first end of the control voltage output circuit 122.

[0123] In some examples, the control voltage output circuit 122 may further include: a first resistor R1 .

[0124] A first end of the first resistor R1 is electrically connected to the power control circuit 121 , and a second end of the first resistor R1 is electrically connected between the anode of the diode group and an input end of the power control circuit 121 .

[0125] In some examples, the diode group may include a first diode D1 and a second diode D2 .

[0126] The cathode of the first diode D1 is electrically connected to the output end of the first error amplifier EA1, the cathode of the second diode D2 is electrically connected to the output end of the second error amplifier EA2, and the anode of the first diode D1 and the anode of the second diode D2 are both electrically connected to the input end of the power control circuit 121.

[0127] The cathode of the first diode D1 and the cathode of the second diode D2 are both cathodes of the diode group, and the anode of the first diode D1 and the anode of the second diode D2 are both anodes of the diode group.

[0128] The first error amplifier EA1 can amplify the current difference between the sampling current IFB in the sampling power and the reference current Iref in the maximum power to obtain a first voltage. In addition, the first error amplifier EA1 can transmit the first voltage to the diode group so that the diode group can obtain the first voltage.

[0129] The second error amplifier EA2 can amplify the voltage difference between the sampled voltage VFB in the sampled power and the reference voltage Vref in the maximum power to obtain a second voltage. In addition, the second error amplifier EA2 can transmit the second voltage to the diode group so that the diode group can obtain the second voltage.

[0130] In this way, the diode group can generate the control voltage FB according to the first voltage and the second voltage. Thus, the control voltage output circuit 122 can obtain the control voltage FB according to the sampled power and the maximum power.

[0131] The control voltage FB is the sum of the minimum voltage of the first voltage and the second voltage and the diode voltage drop.

[0132] In summary, the first error amplifier can amplify the current difference between the sampled current in the sampled power and the reference current in the maximum power to obtain a first voltage, and transmit the first voltage to the diode group so that the diode group can obtain the first voltage. The second error amplifier can amplify the voltage difference between the sampled voltage in the sampled power and the reference voltage in the maximum power to obtain a second voltage, and transmit the second voltage to the diode group so that the diode group can obtain the second voltage. Thus, the diode group can generate a control voltage based on the first voltage and the second voltage, so that the control voltage output circuit can obtain the control voltage.

[0133] Based on the description of the above embodiment, a possible implementation of the control voltage output circuit 122 is exemplified. Figure 4 As shown, the sampling circuit 150 may include: a current sampling circuit 151 and a voltage sampling circuit 152 .

[0134] The input end of the current sampling circuit 151 is used to collect the output current Iout in the output power, the input end of the voltage sampling circuit 152 is electrically connected to the output end of the power conversion circuit 110, and the output end of the current sampling circuit 151 and the output end of the voltage sampling circuit 152 are both electrically connected to the first input end of the drive signal output circuit 120.

[0135] The input end of the current sampling circuit 151 and the input end of the voltage sampling circuit 152 are both input ends of the sampling circuit 150 , and the output end of the current sampling circuit 151 and the output end of the voltage sampling circuit 152 are both output ends of the sampling circuit 150 .

[0136] In some examples, the voltage sampling circuit 152 may include: a second resistor R2 and a third resistor R3 .

[0137] The first end of the second resistor R2 is electrically connected to the output end of the power conversion circuit 110, the second end of the second resistor R2 is electrically connected to the first end of the third resistor R3, the first input end of the drive signal output circuit 120 is electrically connected between the second end of the second resistor R2 and the first end of the third resistor R3, and the second end of the third resistor R3 is grounded.

[0138] The first end of the second resistor R2 is the input end of the voltage sampling circuit 152 , and the output end of the voltage sampling circuit 152 is located between the second end of the second resistor R2 and the first end of the third resistor R3 .

[0139] The current sampling circuit 151 can collect the output current Iout to obtain the sampling current IFB in the sampling power, so that the sampling circuit 150 can obtain the sampling current IFB.

[0140] The voltage sampling circuit 152 can collect the output voltage Vout in the output power to obtain the sampled voltage VFB in the sampled power, so that the sampling circuit 150 can obtain the sampled voltage VFB.

[0141] Based on this, the sampling circuit 150 can obtain the sampling power.

[0142] Based on the description of the above embodiment, a possible implementation of the switch circuit 140 is exemplified. Figure 4 As shown, the switch circuit 140 may include: a first switch tube S1 and a second switch tube S2.

[0143] The first end of the first switch tube S1 and the first end of the second switch tube S2 are both electrically connected to the output end of the power conversion circuit 110, the control end of the first switch tube S1 and the control end of the second switch tube S2 are both electrically connected to the first output end of the program control circuit 130, the second end of the first switch tube S1 is electrically connected to the USB port, and the second end of the second switch tube S2 is the second output end of the switch circuit 140.

[0144] Among them, the first end of the first switch tube S1 and the first end of the second switch tube S2 are both input ends of the switch circuit 140, the control end of the first switch tube S1 and the control end of the second switch tube S2 are both control ends of the switch circuit 140, the second end of the first switch tube S1 is the first output end of the switch circuit 140, and the second end of the second switch tube S2 is the second output end of the switch circuit 140.

[0145] The first switch tube S1 and the second switch tube S2 may include but are not limited to gallium nitride transistors, bipolar junction transistors, insulated gate bipolar transistors, metal-oxide semiconductor field effect transistors, field-controlled thyristors, gate turn-off thyristors and transmission gates.

[0146] For example, when the first switch tube S1 and the second switch tube S2 are gallium nitride transistors, the control ends of the first switch tube S1 and the second switch tube S2 refer to the gates of the gallium nitride transistors, and the first ends of the first switch tube S1 and the second switch tube S2 can be the drain or source of the gallium nitride transistor, and correspondingly, the second ends of the first switch tube S1 and the second switch tube S2 can be the source or drain of the gallium nitride transistor.

[0147] For example, when the first switch tube S1 and the second switch tube S2 are bipolar junction transistors, the control ends of the first switch tube S1 and the second switch tube S2 refer to the base of the bipolar junction transistor, and the first ends of the first switch tube S1 and the second switch tube S2 can be the collector or emitter of the bipolar junction transistor, and correspondingly, the second ends of the first switch tube S1 and the second switch tube S2 can be the emitter or collector of the bipolar junction transistor.

[0148] For example, when the first switch tube S1 and the second switch tube S2 are insulated gate bipolar transistors, the control ends of the first switch tube S1 and the second switch tube S2 refer to the gates of the insulated gate bipolar transistors, and the first ends of the first switch tube S1 and the second switch tube S2 can be the collector or emitter of the insulated gate bipolar transistor, and correspondingly, the second ends of the first switch tube S1 and the second switch tube S2 can be the emitter or collector of the insulated gate bipolar transistor.

[0149] For example, when the first switch tube S1 and the second switch tube S2 are metal-oxide semiconductor field effect transistors, the control end of the first switch tube S1 and the second switch tube S2 refers to the gate of the metal-oxide semiconductor field effect transistor, and the first end of the first switch tube S1 and the second switch tube S2 can be the drain or source of the metal-oxide semiconductor field effect transistor, and correspondingly, the second end of the first switch tube S1 and the second switch tube S2 can be the source or drain of the metal-oxide semiconductor field effect transistor.

[0150] For example, when the first switch tube S1 and the second switch tube S2 are field-controlled thyristors, the control ends of the first switch tube S1 and the second switch tube S2 refer to the gates of the field-controlled thyristors, and the first switch tube S1 and the second switch tube S2 may be drains or sources of the field-controlled thyristors. Correspondingly, the second ends of the first switch tube S1 and the second switch tube S2 may be sources or drains of the field-controlled thyristors.

[0151] For example, when the first switch tube S1 and the second switch tube S2 are gate turn-off thyristors, the control ends of the first switch tube S1 and the second switch tube S2 refer to the gates of the gate turn-off thyristors, and the first ends of the first switch tube S1 and the second switch tube S2 can be the cathode or anode of the gate turn-off thyristors, and correspondingly, the second ends of the first switch tube S1 and the second switch tube S2 can be the cathode or anode of the gate turn-off thyristors.

[0152] For example, when the first switch tube S1 and the second switch tube S2 are transmission gates, the control ends of the first switch tube S1 and the second switch tube S2 refer to the ports of the transmission gate used to access the gate control signal, and the first ends of the first switch tube S1 and the second switch tube S2 can be the input end or the output end of the transmission gate, and correspondingly, the second ends of the first switch tube S1 and the second switch tube S2 can be the input end or the output end of the transmission gate.

[0153] When the second communication result indicates that the USB port is not connected to a load, the program control circuit 130 can control the first switch S1 to be turned off. When the second communication result indicates that the USB port is connected to a load, the program control circuit 130 can control the first switch S1 to be turned on.

[0154] When the first communication result indicates that the power conversion control device 100 needs to supplement power externally, the second switch tube S2 is turned on. When the first communication result indicates that power is supplemented to the power conversion control device 100, the second switch tube S2 is turned on.

[0155] The working principle of the output power control system 1000 is described in detail below.

[0156] When it is detected that the corresponding USB port is not connected to a load, the program control circuit 130 controls the first switch tube S1 to turn off. Moreover, when it is communicated with the program control circuits 130 in the other parallel power conversion control devices 100 to learn that none of them are connected to a load, the program control circuit 130 controls the second switch tube S2 to turn off, so that the power tube conversion control device corresponding to the program control circuit 130 is in an inoperative state.

[0157] When it is detected that the corresponding USB port is connected to a load, and the program control circuit 130 in the other parallel power conversion control devices 100 communicates with the program control circuit 130 to learn that all of them are connected to a load, the program control circuit 130 controls the second switch tube S2 to turn off. At the same time, the program control circuit 130 sets the reference current Iref and the reference voltage Vref of the corresponding power conversion control device according to the first communication result of the communication with the parallel power conversion control device 100, and controls the first switch tube S1 to turn on, so as to transmit the output power to the load.

[0158] Only one USB port among all the USB ports is connected to a load, that is, when the number of loads is one, when it is detected that the corresponding USB port is connected to a load, and when it is communicated with the program control circuit 130 in the other parallel power conversion control devices 100 to learn that none of the parallel power conversion control devices 100 are connected to a load, the program control circuit 130 sets the reference current Iref1, reference current Iref2 to reference current IrefN and reference voltage Vref1, reference voltage Vref2 to reference voltage VrefN corresponding to the power conversion control devices 1 to N according to the first communication result of the program control circuit 130 in the parallel power conversion control device 100. The program control circuit 130 controls the second switch tube S2 and the first switch tube S1 to be turned on, so that the power conversion control device corresponding to the program control circuit 130 is the master device.

[0159] The output voltages VOutK of the power conversion control device 100 are not equal due to the difference in Vrefk.

[0160] When the program control circuit 130 detects that the corresponding USB port is not connected to a load, and communicates with the program control circuits 130 in the other parallel power conversion control devices 100 to learn that a USB port is connected to a load, the program control circuit 130 controls the first switch tube S1 to turn off and the second switch tube S2 to turn on, so that the power conversion control device corresponding to the program control circuit 130 is a power supplement device.

[0161] The power conversion control devices connected to the load and the power conversion control devices not connected to the load are arranged in descending order of the output voltage VOutK as power conversion control devices 101 - 1 , 101 - 2 to 101 -N.

[0162] The second switch tube S2 corresponding to the power conversion control device connected to the load and the power conversion control device not connected to the load are both turned on, so that the output power control 1000 enters the power supplement mode. In the case where the output voltage of the power conversion control device 101-N = < the voltage of the load = < the output voltage of the power conversion control device 101-1, when the load power is less than the maximum power of the power conversion control device 101-1, the voltage of the load is determined by the power conversion control device 101-1. At this time, the power conversion control device 101-1 is in the constant voltage output mode, and the first load power is borne by the power conversion control device 101-1 alone.

[0163] When the load power is greater than the maximum power of the power conversion control device 101-1 and less than the sum of the maximum power of the power conversion control device 101-1 and the maximum power of the power conversion control device 101-2, the load voltage is determined by the power conversion control device 101-2. At this time, the power conversion control device 101-1 changes from the constant voltage output mode to the constant current output mode, the power conversion control device 101-2 is in the constant voltage output mode, and the load power is shared by the power conversion control device 101-1 and the power conversion control device 101-2.

[0164] The power of the power conversion control device 101 - 2 plays a role in power supplement.

[0165] By analogy, as the power of the load gradually increases, the power conversion control device 101-3 to the power conversion control device 101-N will participate in power supplementation in turn, and the voltage of the load is determined by the power conversion control device 101-3 to the power conversion control device 101-N in turn.

[0166] Among them, the power conversion control device 101-2 to the power conversion control device 101-(N-1) will enter the constant current output mode in sequence, and the power conversion control device 101-3 to the power conversion control device 101-N will replenish power in sequence.

[0167] In all USB ports, more than one USB port is connected to a load (wherein there are N-m+1 paths connected to a load, m-1 paths not connected to a load, N-1>=m>=2), that is, when the number of loads is at least 2, the program control circuit 130 selects the power output end of one of the power conversion control devices 101-bb connected to the load as the output end of the aggregated power after power supplementation, that is, the power conversion control device 101-bb is the first power conversion control device. The power conversion control devices connected to the load other than the power conversion control device 101-bb control the corresponding second switch tube S2 to turn off, and the first switch tube S1 to turn on, so that the power conversion control devices connected to the load other than the power conversion control device 101-bb provide output power to their respective corresponding loads.

[0168] Among them, the program control circuit 130 in the power conversion control device of the m-1 path that is not connected to the load communicates with the program control circuit 130 in the power conversion control device 101-bb, and sets the reference current Iref1, reference current Iref2 to reference current Irefm and the reference voltage Vref1, reference voltage Vref2 to reference voltage Vrefm corresponding to the power conversion control device of the m-1 path that is not connected to the load and the power conversion control device 101-bb, that is, the m-1+1 path.

[0169] The power conversion control devices of m-1 lines not connected to the load and the power conversion control device 101-bb are arranged in descending order of output voltage as power conversion control device 101-a1, power conversion control device 101-a2 to power conversion control device 101-am.

[0170] When the load power is less than the maximum power of the power conversion control device 101-a1, that is, the load power of 101-bb is less than the maximum power of the power conversion control device 101-a1, the voltage of the load is determined by the power conversion control device 101-a1. At this time, the power conversion control device 101-a1 is in a constant voltage output mode, and the first load power is borne solely by the power conversion control device 101-a1.

[0171] When the maximum power of the power conversion control device 101-a1 < the power of the load < the sum of the maximum power of the power conversion control device 101-a1 and the maximum power of the power conversion control device 101-a2, the voltage of the load is determined by the power conversion control device 101-a2. At this time, the power conversion control device 101-a1 is in the constant current output mode, the power conversion control device 101-a2 is in the constant voltage output mode, and the second load power is shared by the power conversion control device 101-a1 and the power conversion control device 101-a2.

[0172] The insufficient power of the power conversion control device 101 - a1 is automatically supplemented by the power conversion control device 101 - a2 .

[0173] By analogy, as the power of the load gradually increases, the voltage of the load is determined by power conversion control device 101-a3 to power conversion control device 101-am in turn, power conversion control device 101-a2 to power conversion control device 101-a(m-1) enter the constant current output mode in turn, and power conversion control device 101-a3, power conversion control device 101-a4 to power conversion control device 101-am participate in power supplementation in turn.

[0174] Combine the following Figure 5 , Figure 5 This is a control flow diagram of an output power control system provided by an embodiment of the present application. Taking the power conversion control device 1 and the power conversion control device 2 as examples, the control principle of the output power control system 1000 is introduced in detail, as follows:

[0175] When powered on, both the first switch tube S1 and the second switch tube S2 are turned off.

[0176] When the program control circuit 130 in the power conversion control device 1 detects that the USB1 port is not connected to a load, the power conversion control device 1 turns off the first switch tube S1. In addition, the power conversion control device 1 communicates with the power conversion control device 2 to learn whether the USB2 port is connected to a load.

[0177] When the USB2 port is not connected to a load, the power conversion control device 1 turns off the second switch tube S2, so that the power conversion control device 1 continues to detect whether the USB1 port is connected to a load.

[0178] When the USB2 port is connected to a load, the power conversion control device 1 communicates with the power conversion control device 2 to enter the power compensation mode. In addition, the power conversion control device 1 sets the corresponding reference current Iref1b and reference voltage Vref1b. Furthermore, the power conversion control device 2 controls the corresponding second switch tube S2 to turn on, so that the power conversion control device 1 continues to detect whether the USB1 port is connected to a load.

[0179] When the program control circuit 130 in the power conversion control device 1 detects that the USB1 port is connected to a load, the power conversion control device 1 communicates with the power conversion control device 2 to learn whether the USB2 port is connected to a load.

[0180] When the USB2 port is connected to a load, the power conversion control device 1 sets the corresponding reference current Iref1 and reference voltage Vref1. Thus, the power conversion control device 1 controls the first switch S1 to be turned on, so that the power conversion control device 1 continues to detect whether the USB1 port is connected to a load.

[0181] When the USB2 port is not connected to a load, the power conversion control device 2 communicates with the power conversion control device 1 to enter the power compensation mode. In this way, the power conversion control device 1 sets the corresponding reference current Iref1 and reference voltage Vref1. In addition, the power conversion control device 1 controls the second switch tube S2 to be turned on. At the same time, the power conversion control device 2 sets the corresponding reference current Iref2 and reference voltage Vref2, and controls the corresponding second switch tube S2 to be turned on. Thus, the power conversion control device 1 controls the corresponding first switch tube S1 to be turned on, so that the power conversion control device 1 continues to detect whether the USB1 port is connected to a load.

[0182] The present application also provides a switching power supply 10000. Figure 1 As shown, the switching power supply 10000 may include: an AC-DC converter 2000 and an output power control system 1000 .

[0183] The AC-DC converter 2000 is electrically connected to the output power control system 1000 .

[0184] The AC-DC converter 2000 may transmit an input voltage VIN to the output power control system 1000 .

[0185] An embodiment of the present application also provides a charger chip, including: an output power control system, and / or a switching power supply.

[0186] Among them, the output power control system and the switching power supply can be integrated into one chip or into different chips, and the embodiments of the present application do not specifically limit this.

[0187] The charger chip provided in the embodiment of the present application has the same beneficial effects as the output power control system provided in the embodiment of the present application, which will not be described in detail here.

[0188] An embodiment of the present application also provides an electronic device, including: a charger chip.

[0189] In this application, electronic devices may include but are not limited to: tablet computers, sensors, medical devices, and wireless communication devices.

[0190] The electronic device provided in the embodiment of the present application has the same beneficial effects as the chip provided in the embodiment of the present application, which will not be described in detail here.

[0191] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An output power control system, characterized in that: The output power control system comprises: at least two power conversion control devices and at least two USB ports; the power input end of each power conversion control device is used to access the input voltage, the parallel communication end of each power conversion control device is electrically connected to each other, the power supplement end of each power conversion control device is electrically connected to each other, the power output end and the load communication end of each power conversion control device are electrically connected to each USB port one by one, and each USB port is also used to access the load; The at least two power conversion control devices are used to determine a main device and a power supplement device, and the power supplement device is used to supplement power to the main device; In the case where the voltage of the load is greater than or equal to the minimum output voltage of the main device and the power compensation device, and less than or equal to the maximum output voltage, when the power of the load is less than the maximum power of the main device, the main device is used to provide a first load power to the load according to the input voltage, and the first load power is the output power of the main device; When the power of the load is greater than the maximum power of the main device and less than the sum of the maximum power of the main device and the maximum power of the power supplement device, the main device and the power supplement device are both used to provide a second load power to the load according to the input voltage, and the second load power is the sum of the output power of the main device and the output power of the power supplement device.

2. The system according to claim 1, characterized in that The at least two power conversion control devices are used to, when the number of the load is 1, determine the power conversion control device with the maximum output voltage among the power conversion control device connected to the load and the power conversion control device not connected to the load as the main device, and determine the other power conversion control devices among the power conversion control device connected to the load and the power conversion control device not connected to the load except the power conversion control device with the maximum output voltage as the power supplement device; or, The at least two power conversion control devices are used to determine a first power conversion control device among multiple power conversion control devices connected to the loads when the number of the loads is at least 2, and determine the power conversion control device with the maximum output voltage among the first power conversion control device and the power conversion control devices not connected to the loads as the main device, and determine the other power conversion control devices among the first power conversion control device and the power conversion control devices not connected to the loads except the power conversion control device with the maximum output voltage as the power supplement devices.

3. The system according to claim 1 or 2, characterized in that: The power conversion control device comprises: a power conversion circuit, a drive signal output circuit, a program control circuit, a switch circuit and a sampling circuit; The input end of the power conversion circuit is used to access the input voltage, the output end of the power conversion circuit is electrically connected to the input end of the sampling circuit and the input end of the switch circuit respectively, the output end of the sampling circuit is electrically connected to the input end of the program control circuit and the first input end of the drive signal output circuit respectively, the load communication end of the program control circuit and the first output end of the switch circuit are both electrically connected to the USB port, the second output end of the switch circuit is the power supplement end of the power conversion control device, the first output end of the program control circuit is electrically connected to the control end of the switch circuit, the second output end of the program control circuit is electrically connected to the second input end of the drive signal output circuit, the online communication end of the program control circuit is the parallel communication end of the power conversion control device, and the output end of the drive signal output circuit is electrically connected to the control end of the power conversion circuit; In the case where the power conversion control device is the main device or the power supplement device, wherein: The power conversion circuit is used to convert the input voltage to obtain the output power under the action of a driving signal, and the driving signal is used to drive the switch tube in the power conversion circuit to be turned on or off; The sampling circuit is used to collect the output power to obtain the sampled power, and transmit the sampled power to the drive signal output circuit and the program control circuit respectively; The program control circuit is used to communicate with the main device or the power supplement device to obtain a first communication result, and obtain a maximum power according to the first communication result and the sampled power, and transmit the maximum power to the drive signal output circuit; The driving signal output circuit is used to obtain the driving signal according to the sampled power and the maximum power, and transmit the driving signal to the power conversion circuit; The program control circuit is also used to communicate with the USB port to determine whether the load is connected, obtain a second communication result, and control the on and off of the switch tube in the switch circuit according to the first communication result and the second communication result.

4. The system according to claim 3, characterized in that The driving signal output circuit includes: a power control circuit and a control voltage output circuit; The first input end of the control voltage output circuit is electrically connected to the output end of the sampling circuit, the second input end of the control voltage output circuit is electrically connected to the second output end of the program control circuit, the output end of the control voltage output circuit is electrically connected to the input end of the power control circuit, and the output end of the power control circuit is electrically connected to the control end of the power conversion circuit; The control voltage output circuit is used to obtain a control voltage according to the sampled power and the maximum power, and transmit the control voltage to the power control circuit; The power control circuit is used to generate the driving signal according to the control voltage.

5. The system according to claim 4, characterized in that The control voltage output circuit comprises: a first error amplifier, a second error amplifier and a diode group; The inverting input terminal of the first error amplifier and the inverting input terminal of the second error amplifier are both electrically connected to the output terminal of the sampling circuit, the non-inverting input terminal of the first error amplifier and the non-inverting input terminal of the second error amplifier are both electrically connected to the second output terminal of the program control circuit, the output terminal of the first error amplifier and the output terminal of the second error amplifier are both electrically connected to the cathode of the diode group, and the anode of the diode group is electrically connected to the input terminal of the power control circuit; The first error amplifier is used to amplify the current difference between the sampling current in the sampling power and the reference current in the maximum power to obtain a first voltage, and transmit the first voltage to the diode group; The second error amplifier is used to amplify the voltage difference between the sampled voltage in the sampled power and the reference voltage in the maximum power to obtain a second voltage, and transmit the second voltage to the diode group; The diode group is used to generate the control voltage according to the first voltage and the second voltage.

6. The system according to claim 3, characterized in that The sampling circuit comprises: a current sampling circuit and a voltage sampling circuit; The input end of the current sampling circuit is used to collect the output current in the output power, the input end of the voltage sampling circuit is electrically connected to the output end of the power conversion circuit, and the output end of the current sampling circuit and the output end of the voltage sampling circuit are both electrically connected to the first input end of the drive signal output circuit; The current sampling circuit is used to collect the output current to obtain the sampled current in the sampled power; The voltage sampling circuit is used to collect the output voltage in the output power to obtain the sampled voltage in the sampled power.

7. The system according to claim 3, characterized in that The switch circuit comprises: a first switch tube and a second switch tube; The first end of the first switch tube and the first end of the second switch tube are both electrically connected to the output end of the power conversion circuit, the control end of the first switch tube and the control end of the second switch tube are both electrically connected to the first output end of the program control circuit, the second end of the first switch tube is electrically connected to the USB port, and the second end of the second switch tube is the second output end of the switch circuit.

8. An output power control method, characterized in that: The method is performed by an output power control system, which includes: at least two power conversion control devices and at least two USB ports; the power input end of each power conversion control device is used to access the input voltage, the parallel communication end of each power conversion control device is electrically connected to each other, the power supplement end of each power conversion control device is electrically connected to each other, the power output end and the load communication end of each power conversion control device are electrically connected to each USB port one by one, and each USB port is also used to access the load; the method includes: The at least two power conversion control devices determine a main device and a power supplement device, wherein the power supplement device is used to supplement power to the main device; When the voltage of the load is greater than or equal to the minimum output voltage of the main device and the power compensation device, and less than or equal to the maximum output voltage, when the power of the load is less than the maximum power of the main device, the main device provides a first load power to the load according to the input voltage, and the first load power is the output power of the main device; When the power of the load is greater than the maximum power of the main device and less than the sum of the maximum power of the main device and the maximum power of the power supplement device, the main device and the power supplement device both provide a second load power to the load based on the input voltage, and the second load power is the sum of the output power of the main device and the output power of the power supplement device.

9. A switching power supply, characterized in that: The switching power supply circuit comprises: an AC-DC converter and an output power control system as claimed in any one of claims 1 to 7.

10. A charger chip, characterized in that: include: The output power control system according to any one of claims 1 to 7, and / or the switching power supply according to claim 9.

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