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

Abstract

This application provides an output power control system, method, switching power supply, and charger chip. At least two power conversion control devices determine a main device and a power supplement device, causing the output power control system to enter a power supplement mode. When the load power is greater than the maximum power of the main device but 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 provide a second load power to the load based on the input voltage. Furthermore, the output power of the main device is less than its maximum power, and the output power of the power supplement device is less than its maximum power, resulting in relatively low output power provided by both devices to the load, and heat dissipation within the main device and power supplement device. This reduces the size and cost of the main device and power supplement device, avoids localized hot spots, and reduces heat dissipation difficulty and cost.

Description

TECHNICAL FIELD

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

[0002] For a USB charger containing multiple USB interfaces, each USB interface usually needs a power supply to complete power conversion and regulation. In this way, each power supply can only output power to the corresponding USB interface, and each power supply needs to have the ability to meet the maximum power (i.e. the declared power) of the corresponding USB interface. When the USB charger has only one USB interface connected to a 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 independently bears the declared power of the corresponding USB interface, the power of each power supply is relatively large. As a result, the cost and size of each power supply are relatively high. At the same time, when a power supply is working at full load, the heat is concentrated on the devices of this power supply, causing local hot spots. As a result, the difficulty and cost of heat dissipation are increased. SUMMARY

[0004] The present application provides an output power control system and method, switching power supply and charger chip, which can reduce the cost and size of the 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, which 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 connect to an input voltage, the parallel communication ends of each power conversion control device are electrically connected to each other, the power supply ends of each power conversion control device are electrically connected to each other, and 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 connect to a load.

[0006] The at least two power conversion control devices are used to determine a master device and a power supply device, and the power supply device is used to supply power to the master device.

[0007] When the voltage of the load is greater than or equal to the minimum output voltage of the master device and the power supply device, and less than or equal to the maximum output voltage, and the power of the load is less than the maximum power of the master device, the master 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 master device.

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

[0009] The output power control system provided by the first aspect can determine the master device and the power supplement device for supplementing power to the master device, so that the output power control system enters the power supplement mode. In this way, when the power of the load is less than the maximum power of the master device, the master device can provide a first load power to the load according to the input voltage in the case that the voltage of the load is greater than or equal to the minimum output voltage of the master device and the power supplement device and less than or equal to the maximum output voltage. The first load power is provided only by the output power of the master device. In this way, the output power of the master device is less than the maximum power of the master device, and the master device is in an under-load working state. Further, the output power provided by the master device to the load is small, and heat cannot be concentrated on the master device. When the power of the load is greater than the maximum power of the master device and less than the sum of the maximum power of the master device and the maximum power of the power supplement device, the master device and the power supplement device can both provide a second load power to the load according to the input voltage. The second load power is provided by the output power of the master device and the output power of the power supplement device. Further, the output power of the master device is less than the maximum power of the master device, and the output power of the power supplement device is less than the maximum power of the power supplement device. In this way, the output power provided by the master device and the power supplement device to the load is small, and heat is dispersed on the master device and the power supplement device. Therefore, the volume and cost of the master device and the power supplement device can be reduced, and local hot spots can be avoided, so that the difficulty and cost of heat dissipation are reduced.

[0010] In a possible design, the at least two power conversion control devices are configured to, when the number of loads is one, determine, as the master device, a power conversion control device with the maximum output voltage from among power conversion control devices that are connected to the load and power conversion control devices that are not connected to the load, and determine, as the power supplement device, the power conversion control devices other than the power conversion control device with the maximum output voltage from among the power conversion control devices that are connected to the load and the power conversion control devices that are not connected to the load.

[0011] Alternatively,

[0012] The at least two power conversion control devices are configured to determine a first power conversion control device in a plurality of power conversion control devices connected to the load when the number of the load is at least two, determine the first power conversion control device and a power conversion control device with a maximum output voltage among the power conversion control devices not connected to the load as the master device, and determine the first power conversion control device and the other power conversion control devices not connected to the load 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 switching circuit and a sampling circuit.

[0014] An input end of the power conversion circuit is configured to be connected to the input voltage, an output end of the power conversion circuit is electrically connected to an input end of the sampling circuit and an input end of the switching circuit respectively, an output end of the sampling circuit is electrically connected to an input end of the program control circuit and a first input end of the drive signal output circuit respectively, a load communication end of the program control circuit and a first output end of the switching circuit are electrically connected to the USB port, a second output end of the switching circuit is a power supplement end of the power conversion control device, a first output end of the program control circuit is electrically connected to a control end of the switching circuit, a second output end of the program control circuit is electrically connected to a second input end of the drive signal output circuit, a computer communication end of the program control circuit is a parallel computer communication end of the power conversion control device, and an output end of the drive signal output circuit is electrically connected to a control end of the power conversion circuit.

[0015] In a case where the power conversion control device is the master device or the power supplement device, the power conversion control device includes:

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

[0017] The sampling circuit is configured to collect the output power to obtain a sampling power, and transmit the sampling power to the drive signal output circuit and the program control circuit respectively.

[0018] The program control circuit is configured to communicate with the master device or the power supplement device to obtain a first communication result, obtain a maximum power according to the first communication result and the sampling power, and transmit the maximum power to the drive signal output circuit.

[0019] The driving signal output circuit is configured to obtain the driving signal according to the sampling power and the maximum power, and transmit the driving signal to the power conversion circuit.

[0020] The program control circuit is further configured to determine whether to access the load in communication with the USB port, obtain a second communication result, and control on-off of a switch tube in the switch circuit according to the first communication result and the second communication result, so that the power conversion control device is the host device or the power supplement device.

[0021] In a possible design, the driving signal output circuit includes a power control circuit and a control voltage output circuit.

[0022] The first input terminal of the control voltage output circuit is electrically connected with the output terminal of the sampling circuit, the second input terminal of the control voltage output circuit is electrically connected with the second output terminal of the program control circuit, the output terminal of the control voltage output circuit is electrically connected with the input terminal of the power control circuit, and the output terminal of the power control circuit is electrically connected with the control terminal of the power conversion circuit.

[0023] The control voltage output circuit is configured to obtain a control voltage according to the sampling power and the maximum power, and transmit the control voltage to the power control circuit.

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

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

[0026] The reverse input terminal of the first error amplifier and the reverse input terminal of the second error amplifier are electrically connected with the output terminal of the sampling circuit, the same direction input terminal of the first error amplifier and the same direction input terminal of the second error amplifier are electrically connected with 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 electrically connected with the negative electrode of the diode group, and the positive electrode of the diode group is electrically connected with the input terminal of the power control circuit.

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

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

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

[0030] In a possible design of the application, the sampling circuit includes a current sampling circuit and a voltage sampling circuit.

[0031] The input end of the current sampling circuit is configured to collect an 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 electrically connected to the first input end of the drive signal output circuit.

[0032] The current sampling circuit is configured to collect the output current to obtain a sampling current in the sampling power.

[0033] The voltage sampling circuit is configured to collect an output voltage in the output power to obtain a sampling voltage in the sampling power.

[0034] In a possible design of the application, 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 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 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 application provides an output power control method, which is executed by the output power control system in the first aspect and each possible design of the first aspect. The output power control system 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 configured to access an input voltage, the parallel communication ends of each power conversion control device are electrically connected to each other, the power supplement ends of each power conversion control device are 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, and each USB port is further configured to access a load. The method includes the following steps.

[0037] When the voltage of the load is greater than or equal to the minimum output voltage 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, the first load power being 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 according to the input voltage, the second load power being the sum of the output power of the main device and the output power of the power supplement device.

[0039] The method provided by the second aspect and the possible designs of the second aspect has the beneficial effects of the first aspect and the possible designs of the first aspect, which will not be repeated here.

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

[0041] In a fourth aspect, the present application provides a charger chip, comprising the output power control system in the first aspect and the possible designs of the first aspect, and / or the switching power supply in the third aspect.

[0042] The above description is only a summary of the technical solutions of the embodiments of the present application. In order to make the technical means of the embodiments of the present application more clear, the embodiments can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

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

[0045] Figure 2 A flowchart of an output power control method provided by an embodiment of the present application;

[0046] Figure 3 An output power schematic diagram of an output power control system provided by an embodiment of the present application;

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

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

[0049] In the present application, “at least one” means one or more, and “multiple” means two or more. “And / or” describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character “ / ” generally represents an “or” relationship between the associated objects. “At least one of the following” or similar expressions means any combination of these items, including single item or any combination of multiple items. For example, at least one of a, b or c alone, which can represent: a alone, b alone, c alone, combination of a and b, combination of a and c, combination of b and c, or combination of a, b and c, where a, b and c can be single or multiple. In addition, the terms “first” and “second” are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0050] The terms “center”, “longitudinal”, “transverse”, “upper”, “lower”, “left”, “right”, “front”, “back” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0051] The terms “connected” and “connected” should be broadly understood, for example, the “connected” or “connected” of the circuit structure can mean 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, it can also be the internal connection of two elements; In addition to signal connection through the circuit, signal connection through media medium, such as radio waves, can also be referred to. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] Reference Figure 1 ,Figure 1 A structural schematic diagram of an output power control system is provided for an embodiment of the present application. As shown in the figure, the output power control system 1000 can include at least two power conversion control devices and at least two USB ports; a power input end of each power conversion control device 100 is used to access an input voltage VIN, parallel communication ends of each power conversion control device 100 are electrically connected, power supplement ends of each power conversion control device 100 are electrically connected, power output ends and load communication ends of each power conversion control device 100 are electrically connected with each USB port one by one, and each USB port is further used to access a load. Figure 1

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

[0054] In the following, the output power control system 1000 is described with reference to the structural schematic diagram of the output power control system 1000. Figure 2 Figure 2 A flowchart of an output power control method is provided for an embodiment of the present application.

[0055] S101, at least two power conversion control devices determine a master device and a power supplement device.

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

[0057] In a case where the voltage of the load is greater than or equal to the minimum output voltage in the master device and the power supplement device and is 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 master device, the master 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 master device and is less than the sum of the maximum power of the master device and the maximum power of the power supplement device, the master device and the power supplement device both provide a second load power to the load according to the input voltage.

[0060] For ease of description, in the embodiments of the present application, the at least two power conversion control devices are taken as N power conversion control devices 100 for description, where N >= 2.

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

[0062] ​​The power supply device is configured to supply power to the main device.

[0063] In this way, when the power of the load is less than the maximum power of the main device, the main device can supply the first load power to the load according to the input voltage VIN, in the case that the voltage of the load is greater than or equal to the minimum output voltage Vout in the main device and the power supply device and less than or equal to the maximum output voltage Vout.

[0064] The main device is in the 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 main device supplies less power to the load. Thus, the volume and cost of the main device can be reduced.

[0066] In addition, compared with the current-sharing control mode, only the main device bears the first load power, and the power supply device is in the non-loaded working state, so that the light-load efficiency of the main device can be improved.

[0067] Meanwhile, the main device is in the non-full-load working state, so that heat cannot be concentrated on the main device. Thus, local hot spots can be avoided, and the heat dissipation difficulty and cost can be reduced.

[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 supply device, the main device and the power supply device can supply the second load power to the load according to the input voltage VIN. That is, the second load power is borne by the main device and the power supply device. At this time, the power supply device plays a role of power supply.

[0070] The number of the power supply devices can be one or multiple, which is not limited in the embodiments of the present application. When the number of the power supply devices is multiple, the last power supply device among the power supply devices is in the constant-voltage output mode, and the main device and the other power supply devices except the last power supply device among the power supply devices are in the constant-current output mode. The voltage of the load is determined by the last power supply device among the power supply devices.

[0071] Thus, 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 small. Therefore, the cost and volume of the main device and the power supplement device can be reduced. Meanwhile, the heat can be dispersed on the main device and the power supplement device. Further, the heat can be avoided from being concentrated on the main device or the power supplement device, and the local hot spot can be avoided. Therefore, the heat dissipation difficulty and cost 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 in the application can determine the main device and the power supplement device for the main device, so that the output power control system enters the power supplement mode. Thus, when the load voltage is greater than or equal to the minimum output voltage of the main device and the power supplement device, and less than or equal to the maximum output voltage, and the load power 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 an under-load working state. Further, 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 load power 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 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. Further, 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 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 local hot spot can be avoided, and the heat dissipation difficulty and cost can be reduced.

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

[0075] For a load of one, at least two power conversion control devices are arranged in descending order of output voltage. Thus, the power conversion control device connected to the load and the power conversion control device not connected to the load are designated as power conversion control device 101-1, power conversion control device 101-2, and so on, to power conversion control device 101-N. Furthermore, at least two power conversion control devices can designate the power conversion control device with the largest output voltage among those connected to the load and those not connected to the load, i.e., power conversion control device 101-1, as the main device. And at least two power conversion control devices can designate all other power conversion control devices among those connected to the load and those not connected to the load, excluding the one with the largest output voltage, i.e., power conversion control devices 101-2 to power conversion control devices 101-N, as power supplementary devices.

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

[0077] For example, refer to Figure 3 , Figure 3 This is a schematic diagram of the output power of an output power control system provided in one embodiment of this application. Figure 3 As shown, when the load power is greater than the maximum power of power conversion control device 101-1, but less than the sum of the maximum power of power conversion control device 101-1 and the maximum power of power conversion control device 101-2, power conversion control devices 101-1 and 101-2 jointly provide a second load power to the load. That is, the second load power is the sum of the output power of power conversion control device 101-1 and the output power of power conversion control device 101-2, i.e., POUT = POUT101-1 + POUT101-2.

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

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

[0080] The output power of the power conversion control device 101-2 functions as power supplement.

[0081] For 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 the 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 constant voltage output mode, and the power conversion control device 101-1 and the power conversion control device 101-2 are in 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 function as power supplement.

[0084] Therefore, as the power of the load gradually increases, the power conversion control device 101-4 to the power conversion control device 101-N will participate in the work of jointly providing the second load power to the load in turn. That is, the power conversion control device 101-4 to the power conversion control device 101-N will participate in power supplement in turn.

[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 turn, and the power conversion control device 101-3 to the power conversion control device 101-(N-1) will enter constant current output mode in turn. The power conversion control device 101-4 to the power conversion control device 101-N will enter constant voltage output mode in turn.

[0086] For the case that the number of loads is at least two, the plurality of power conversion control devices accessed by the load can communicate through the corresponding parallel communication end to determine that a power conversion control device accessed by the load in the plurality of power conversion control devices accessed by the load 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 in the plurality of power conversion control devices accessed by the load.

[0087] For example, the first power conversion control device 101-bb and the power conversion control devices not connected to the load are totally m (where N-1 >= m >= 2, 1 <= k <= m, k represents a certain one of the m) in number. And, the first power conversion control device 101-bb and the power conversion control devices not connected to the load are arranged in descending order of output voltage. In this way, the first power conversion control device 101-bb and the power conversion control devices not connected to the load are in turn the power conversion control device 101-al, the power conversion control device 101-a2 to the power conversion control device 101-am. Further, at least two power conversion control devices can determine the power conversion control device 101-al having the largest output voltage among the first power conversion control device 101-bb and the power conversion control devices not connected to the load as the master device, and determine the power conversion control devices 101-a2 to 101-am other than the power conversion control device 101-al having the largest output voltage among the first power conversion control device 101-bb and the power conversion control devices not connected to the load as the power supplement devices.

[0088] Thus, for example, when the power of the load, i.e. 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-al, the power conversion control device 101-al provides the first load power to the load.

[0089] Wherein 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 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-al and less than the sum of the maximum power of the power conversion control device 101-al and the maximum power of the power conversion control device 101-a2, the power conversion control device 101-al and the power conversion control device 101-a2 jointly provide the second load power to the load.

[0091] Wherein 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 constant voltage output mode, and the power conversion control device 101-al is in constant current output mode.

[0092] Wherein the output power of the power conversion control device 101-a2 plays a role of power supplement.

[0093] For 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 the second load power to the load.

[0094] wherein 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 the constant voltage output mode, and the power conversion control device 101-a1 and the power conversion control device 101-a2 are in the constant current output mode.

[0095] wherein the output power of the power conversion control device 101-a2 and the output power of the power conversion control device 101-a3 play the 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 participate in the work of jointly providing the second load power to the load in turn. That is, the power conversion control device 101-a4 to the power conversion control device 101-am will participate in power supplement in turn.

[0097] wherein 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 there is one load, at least two power conversion control devices can identify the power conversion control device with the largest output voltage among those connected to the load and those not connected to the load as the main device, and identify the other power conversion control devices among those connected to the load and those not connected to the load, excluding the power conversion control device with the largest output voltage, as power supplementary devices. Alternatively, when there are at least two loads, at least two power conversion control devices can identify a first power conversion control device among multiple power conversion control devices connected to the load, identify the first power conversion control device and the power conversion control device with the largest output voltage among those not connected to the load as the main device, and identify the other power conversion control devices among the first power conversion control device and those not connected to the load, excluding the power conversion control device with the largest output voltage, as power supplementary devices. Thus, at least two power conversion control devices can be identified as the main device and the power supplementary devices.

[0099] Based on the description of the above embodiments, an exemplary possible implementation of the power conversion control device 100 is provided. (Refer to...) Figure 4 , Figure 4 This is a schematic diagram of the structure of a power conversion control device in an output power control system according to an embodiment of this 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 switching circuit 140, and a sampling circuit 150.

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

[0101] The power conversion circuit 110, drive signal output circuit 120, program control circuit 130, switching circuit 140 and sampling circuit 150 can be set separately or integrated. This application embodiment does not make specific limitations on this.

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

[0103] Figure 4 In the diagram, the input terminal of the power conversion circuit 110 is denoted as 1, the output terminal of the power conversion circuit 110 is denoted as 2, the input terminal of the switching circuit 140 is denoted as 1, the first output terminal of the switching circuit 140 is denoted as 2, the second output terminal of the switching circuit 140 is denoted as 3, the input terminal of the program control circuit 130 is denoted as 1, the load communication terminal of the program control circuit 130 is denoted as 2, the first output terminal of the program control circuit 130 is denoted as 3, the second output terminal of the program control circuit 130 is denoted as 4, and the connection communication terminal of the program control circuit 130 is denoted as 5. In this circuit, the input terminal of the program control circuit 130 used to connect the sampling current IFB is denoted as 1-1, the input terminal of the program control circuit 130 used to connect the sampling voltage VFB is denoted as 1-2, the first output terminal of the program control circuit 130 used to control the first switch S1 is denoted as 3-1, the first output terminal of the program control circuit 130 used to control the second switch S2 is denoted as 3-2, the second output terminal of the program control circuit 130 used to output the reference voltage Vref is denoted as 4-1, and the second output terminal of the program control circuit 130 used to output the reference current Iref is denoted as 4-2.

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

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

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

[0107] The sampling circuit 150 can acquire the output power to obtain the sampled power. Furthermore, 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 acquire the sampled power.

[0108] The program control circuit 130 can communicate with the main device or the power supplementation device to obtain a first communication result. Furthermore, the program control circuit 130 can obtain the maximum power based on 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 the main device, the program control circuit 130 can communicate with the power supplementation device to obtain a first communication result. When the power conversion control device 100 is a power supplementation device, the program control circuit 130 can communicate with the main device to obtain a first communication result.

[0110] The drive signal output circuit 120 can obtain a drive signal based on the sampled power and the maximum power. Furthermore, the drive signal output circuit 120 can transmit the drive signal to the power conversion circuit 110, enabling the power conversion circuit 110 to acquire the drive signal and convert the input voltage VIN.

[0111] The program control circuit 130 can communicate with the USB port to determine whether a load is connected and obtain a second communication result. Furthermore, based on the first and second communication results, the program control circuit 130 can control the switching transistor in the switching circuit 140 to turn the power conversion control device 100 into a main device or a power supplement device.

[0112] In summary, under the influence of the drive signal, the power conversion circuit can convert the input voltage to obtain output power, enabling the main device or power supplement device to receive an output signal. The sampling circuit can collect the output power, obtain sampled power, and transmit the sampled power to both the drive signal output circuit and the program control circuit, allowing them to acquire the sampled power. The program control circuit can communicate with the main device or power supplement device to obtain a first communication result. Furthermore, based on the first communication result and the sampled power, the program control circuit can obtain the maximum power and transmit it to the drive signal output circuit, enabling it to acquire the maximum power. Thus, the drive signal output circuit can obtain a drive signal based on the sampled power and the maximum power, and transmit the drive signal to the power conversion circuit. The program control circuit communicates with the USB port to determine whether a load is connected, obtaining a second communication result, and controls the switching transistor in the switching circuit to turn on or off based on the first and second communication results. Therefore, the main device or power supplement device can obtain output power to provide either a first load power or a second load power to the load.

[0113] Based on the description of the above embodiments, an exemplary possible implementation of the drive signal output circuit 120 is provided. For example... Figure 4 As shown, the drive signal output circuit 120 may include a power control circuit 121 and a control voltage output circuit 122.

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

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

[0116] The control voltage output circuit 122 can obtain the control voltage FB based on 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, enabling the power control circuit 121 to acquire the control voltage FB.

[0117] Thus, the power control circuit 121 can generate a drive signal based on the control voltage FB. Consequently, the drive signal output circuit 120 can obtain the drive signal based on the sampled power and the maximum power.

[0118] In this circuit, the 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 based on the sampled power and the maximum power, and transmit the control voltage to the power control circuit, enabling the power control circuit to acquire the control voltage. Therefore, the power control circuit can generate a drive signal based on the control voltage, allowing the drive signal output circuit to obtain the drive signal.

[0120] Based on the description of the above embodiments, an exemplary possible implementation of the control voltage output circuit 122 is provided. For example... 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 terminals of the first error amplifier EA1 and the second error amplifier EA2 are both electrically connected to the output terminal of the sampling circuit 150. The non-inverting input terminals of the first error amplifier EA1 and the second error amplifier EA2 are both electrically connected to the second output terminal of the program control circuit 130. The output terminals of the first error amplifier EA1 and the second error amplifier EA2 are both electrically connected to the negative terminal of the diode group. The positive terminal of the diode group is electrically connected to the input terminal of the power control circuit 121.

[0122] In this circuit, 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 terminals of the control voltage output circuit 122, 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 the second input terminals of the control voltage output circuit 122, and the first terminal of the first resistor R1 is the first terminal of the control voltage output circuit 122.

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

[0124] The first end of the first resistor R1 is electrically connected to the power control circuit 121, and the second end of the first resistor R1 is electrically connected between the positive terminal of the diode group and the input terminal 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 terminal of the first error amplifier EA1, the cathode of the second diode D2 is electrically connected to the output terminal of the second error amplifier EA2, and the anodes of both the first diode D1 and the second diode D2 are electrically connected to the input terminal of the power control circuit 121.

[0127] In this configuration, the negative terminals of the first diode D1 and the second diode D2 are both negative terminals of the diode group, and the positive terminals of the first diode D1 and the second diode D2 are both positive terminals of the diode group.

[0128] The first error amplifier EA1 amplifies the current difference between the sampling current IFB in the sampling power and the reference current Iref in the maximum power to obtain the first voltage. Furthermore, the first error amplifier EA1 can transmit the first voltage to the diode group, enabling the diode group to acquire the first voltage.

[0129] The second error amplifier EA2 amplifies the voltage difference between the sampling voltage VFB in the sampling power and the reference voltage Vref in the maximum power to obtain a second voltage. Furthermore, the second error amplifier EA2 can transmit the second voltage to the diode group, enabling the diode group to acquire the second voltage.

[0130] Thus, the diode array can generate a control voltage FB based on the first voltage and the second voltage. Consequently, the control voltage output circuit 122 can obtain the control voltage FB based on the sampled power and the maximum power.

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

[0132] In summary, the first error amplifier amplifies the current difference between the sampling current in the sampling power and the reference current in the maximum power to obtain a first voltage, which is then transmitted to the diode group, enabling the diode group to acquire the first voltage. The second error amplifier amplifies the voltage difference between the sampling voltage in the sampling power and the reference voltage in the maximum power to obtain a second voltage, which is also transmitted to the diode group, enabling the diode group to acquire the second voltage. Therefore, the diode group can generate a control voltage based on the first and second voltages, allowing the control voltage output circuit to obtain the control voltage.

[0133] Based on the description of the above embodiments, an exemplary possible implementation of the control voltage output circuit 122 is provided. For example... Figure 4 As shown, the sampling circuit 150 may include a current sampling circuit 151 and a voltage sampling circuit 152.

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

[0135] The input terminals of the current sampling circuit 151 and the voltage sampling circuit 152 are both input terminals of the sampling circuit 150, and the output terminals of the current sampling circuit 151 and the voltage sampling circuit 152 are both output terminals 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 terminal of the voltage sampling circuit 152, and the output terminal 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 and 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 and obtain the sampling voltage VFB in the sampling power, so that the sampling circuit 150 can obtain the sampling voltage VFB.

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

[0142] Based on the description of the above embodiments, an exemplary possible implementation of the switching circuit 140 is provided. Figure 5 As shown, the switching circuit 140 may include: a first switching transistor S1 and a second switching transistor S2.

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

[0144] Wherein, the first terminal of the first switch S1 and the first terminal of the second switch S2 are both input terminals of the switch circuit 140, the control terminal of the first switch S1 and the control terminal of the second switch S2 are both control terminals of the switch circuit 140, the second terminal of the first switch S1 is the first output terminal of the switch circuit 140, and the second terminal of the second switch S2 is the second output terminal of the switch circuit 140.

[0145] The first switch S1 and the second switch 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 S1 and the second switch S2 are gallium nitride transistors, the control terminal of the first switch S1 and the second switch S2 refers to the gate of the gallium nitride transistor. The first terminal of the first switch S1 and the second switch S2 can be the drain or source of the gallium nitride transistor. Correspondingly, the second terminal of the first switch S1 and the second switch S2 can be the source or drain of the gallium nitride transistor.

[0147] For example, when the first switch S1 and the second switch S2 are bipolar junction transistors, the control terminal of the first switch S1 and the second switch S2 refers to the base of the bipolar junction transistor. The first terminal of the first switch S1 and the second switch S2 can be the collector or emitter of the bipolar junction transistor. Correspondingly, the second terminal of the first switch S1 and the second switch S2 can be the emitter or collector of the bipolar junction transistor.

[0148] For example, when the first switch S1 and the second switch S2 are insulated gate bipolar transistors (IGBTs), the control terminal of the first switch S1 and the second switch S2 refers to the gate of the IGBT. The first terminal of the first switch S1 and the second switch S2 can be the collector or emitter of the IGBT. Correspondingly, the second terminal of the first switch S1 and the second switch S2 can be the emitter or collector of the IGBT.

[0149] For example, when the first switch S1 and the second switch S2 are metal-oxide-semiconductor field-effect transistors, the control terminals of the first switch S1 and the second switch S2 refer to the gates of the metal-oxide-semiconductor field-effect transistors. The first terminals of the first switch S1 and the second switch S2 can be the drain or source of the metal-oxide-semiconductor field-effect transistors. Correspondingly, the second terminals of the first switch S1 and the second switch S2 can be the source or drain of the metal-oxide-semiconductor field-effect transistors.

[0150] For example, when the first switch S1 and the second switch S2 are field-controlled thyristors, the control terminal of the first switch S1 and the second switch S2 refers to the gate of the field-controlled thyristor. The first switch S1 and the second switch S2 can be the drain or source of the field-controlled thyristor. Correspondingly, the second terminal of the first switch S1 and the second switch S2 can be the source or drain of the field-controlled thyristor.

[0151] For example, when the first switch S1 and the second switch S2 are gate turn-off thyristors, the control terminals of the first switch S1 and the second switch S2 refer to the gate of the gate turn-off thyristor. The first terminals of the first switch S1 and the second switch S2 can be the cathode or anode of the gate turn-off thyristor. Correspondingly, the second terminals of the first switch S1 and the second switch S2 can be the cathode or anode of the gate turn-off thyristor.

[0152] For example, when the first switch S1 and the second switch S2 are transmission gates, the control terminals of the first switch S1 and the second switch S2 refer to the ports of the transmission gate used to receive gate control signals. The first terminals of the first switch S1 and the second switch S2 can be the input terminals or output terminals of the transmission gate. Correspondingly, the second terminals of the first switch S1 and the second switch S2 can be the input terminals or output terminals of the transmission gate.

[0153] Specifically, 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 turn 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 turn on.

[0154] Specifically, when the first communication result indicates that the power conversion control device 100 needs to provide external power replenishment, the second switch S2 is turned on. When the first communication result indicates that power has been replenished to the power conversion control device 100, the second switch S2 is turned on.

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

[0156] When the corresponding USB port is detected to be unconnected to a load, the program control circuit 130 controls the first switch S1 to turn off. Furthermore, upon communicating with the program control circuits 130 in the other parallel power conversion control devices 100 and learning that none of them are connected to a load, the program control circuit 130 controls the second switch S2 to turn off, so that the power conversion control device corresponding to the program control circuit 130 is in a non-operating state.

[0157] When a load is detected connected to the corresponding USB port, and the program control circuit 130 in the other parallel power conversion control devices 100 communicates with the program control circuit 130 to confirm that loads are also connected, the program control circuit 130 controls the second switch S2 to turn off. Simultaneously, based on the first communication result with the parallel power conversion control devices 100, the program control circuit 130 sets the reference current Iref and reference voltage Vref of the corresponding power conversion control device and controls the first switch S1 to turn on, thereby transmitting output power to the load.

[0158] Only one USB port is connected to a load. That is, when there is only one load, if a load is detected at the corresponding USB port, and communication with the program control circuit 130 of the other parallel power conversion control devices 100 reveals that none of the parallel power conversion control devices 100 are connected to a load, the program control circuit 130, based on the first communication result with the program control circuits 130 of the parallel power conversion control devices 100, sets the reference currents Iref1, Iref2, and IrefN, and the reference voltages Vref1, Vref2, and VrefN for power conversion control devices 1 to N. The program control circuit 130 then controls the second switch S2 and the first switch S1 to turn on, making the power conversion control device corresponding to the program control circuit 130 the master device.

[0159] The output voltage VOutK of the power conversion control device 100 is not equal due to the different Vrefk.

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

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

[0162] Both the second switch S2 corresponding to the power conversion control device connected to the load and the power conversion control device not connected to the load are turned on, causing the output power control 1000 to enter the power supplementation mode. When the output voltage of power conversion control device 101-N is less than the load voltage and less than the output voltage of power conversion control device 101-1, and the load power is less than the maximum power of power conversion control device 101-1, the load voltage is determined by power conversion control device 101-1. At this time, power conversion control device 101-1 is in constant voltage output mode, and the first load power is solely borne by power conversion control device 101-1.

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

[0164] Among them, the power conversion control device 101-2 plays the role of power supplementation.

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

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

[0167] There are more than one USB port connected to a load in all USB ports (where there are N-m+1 connected loads and m-1 unconnected loads, N-1>=m>=2). That is, when there are at least two loads, the program control circuit 130 selects the power output terminal of the power conversion control device 101-bb connected to one of the loads as the output terminal of the total power after power supplementation; that is, power conversion control device 101-bb is the first power conversion control device. Power conversion control devices connected to loads other than power conversion control device 101-bb control the corresponding second switch S2 to turn off and the first switch S1 to turn on, enabling the power conversion control devices connected to loads other than power conversion control device 101-bb to provide output power to their respective loads.

[0168] Among them, the program control circuit 130 in the power conversion control device without load in the m-1 channel communicates with the program control circuit 130 in the power conversion control device 101-bb, and sets the reference currents Iref1, Iref2 to Irefm and the reference voltages Vref1, Vref2 to Vrefm corresponding to the power conversion control device without load in the m-1 channel and the power conversion control device 101-bb, i.e., the m-1+1 channel.

[0169] The power conversion control devices and power conversion control devices 101-bb that are not connected to the load on the m-1 channel 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 of the power conversion control device is less than the maximum power of the power conversion control device 101-a1, that is, when the load power of 101-bb is less than the maximum power of the power conversion control device 101-a1, the load voltage is determined by the power conversion control device 101-a1. At this time, the power conversion control device 101-a1 is in 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 power conversion control device 101-a1 is less than the load power, and less than the sum of the maximum power of power conversion control device 101-a1 and the maximum power of power conversion control device 101-a2, the load voltage is determined by power conversion control device 101-a2. At this time, power conversion control device 101-a1 is in constant current output mode, and power conversion control device 101-a2 is in constant voltage output mode. The second load power is shared by power conversion control devices 101-a1 and 101-a2.

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

[0173] Similarly, as the power of the load gradually increases, the voltage of the load is determined sequentially by the power conversion control devices 101-a3 to 101-am. The power conversion control devices 101-a2 to 101-a(m-1) sequentially enter the constant current output mode, and the power conversion control devices 101-a3, 101-a4 to 101-am sequentially participate in power replenishment.

[0174] The following is combined Figure 5 , Figure 1 This is a schematic diagram of the control flow of an output power control system provided in an embodiment of this application. Taking power conversion control device 1 and power conversion control device 2 as examples, the control principle of the output power control system 1000 is described in detail below:

[0175] When power is applied, both the first switch S1 and the second switch S2 are turned off.

[0176] When the program control circuit 130 in the power conversion control device 1 detects that no load is connected to the USB1 port, the power conversion control device 1 turns off the first switch S1. Furthermore, the power conversion control device 1 communicates with the power conversion control device 2 to determine whether a load is connected to the USB2 port.

[0177] When no load is connected to the USB2 port, the power conversion control device 1 turns off the second switch S2 so that the power conversion control device 1 can continue to detect whether the USB1 port is connected to a load.

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

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

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

[0181] When no load is connected to the USB2 port, power conversion control device 2 communicates with power conversion control device 1 to enter power compensation mode. In this mode, power conversion control device 1 sets the corresponding reference current Iref1 and reference voltage Vref1. Furthermore, power conversion control device 1 controls the second switch S2 to turn on. Simultaneously, power conversion control device 2 sets the corresponding reference current Iref2 and reference voltage Vref2, and controls the corresponding second switch S2 to turn on. Therefore, power conversion control device 1 controls the corresponding first switch S1 to turn on, allowing power conversion control device 1 to continue detecting whether a load is connected to the USB1 port.

[0182] This application also provides a switching power supply 10000. For example... ​ 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 can transmit the input voltage VIN to the output power control system 1000.

[0185] This application also provides a charger chip, including: an output power control system, and / or, a switching power supply.

[0186] The output power control system and the switching power supply can be integrated into one chip or into different chips; this application does not specifically limit this.

[0187] The charger chip provided in this application embodiment has the same beneficial effects as the output power control system provided in this application embodiment, and will not be described again here.

[0188] This application also provides an electronic device, including a charger chip.

[0189] In this application, the electronic device may include, but is not limited to: tablet computer, sensor, medical device and wireless communication device.

[0190] The electronic device provided in this application embodiment has the same beneficial effects as the chip provided in this application embodiment, and will not be described again here.

[0191] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An output power control system, characterized by, The output power control system comprises at least two power conversion control devices and at least two USB ports; a power input end of each of the power conversion control devices is used for accessing an input voltage; parallel communication ends of each of the power conversion control devices are electrically connected with each other; power supplement ends of each of the power conversion control devices are electrically connected with each other; a power output end and a load communication end of each of the power conversion control devices are electrically connected with each of the USB ports one by one; and each of the USB ports is further used for accessing a load. The at least two power conversion control devices are used for determining a master device and a power supplement device, and the power supplement device is used for supplementing power to the master device. In a case where a voltage of the load is greater than or equal to a minimum output voltage in the master device and the power supplement device and less than or equal to a maximum output voltage, when power of the load is less than a maximum power of the master device, the master device is used for providing a first load power to the load according to the input voltage, and the first load power is an output power of the master device. When the power of the load is greater than the maximum power of the master device and less than a sum of the maximum power of the master device and a maximum power of the power supplement device, the master device and the power supplement device are both used for providing a second load power to the load according to the input voltage, and the second load power is a sum of an output power of the master device and an output power of the power supplement device. The power conversion control device comprises a power conversion circuit, a drive signal output circuit, a program control circuit, a switching circuit and a sampling circuit. An input end of the power conversion circuit is used for accessing the input voltage; an output end of the power conversion circuit is electrically connected with an input end of the sampling circuit and an input end of the switching circuit respectively; an output end of the sampling circuit is electrically connected with an input end of the program control circuit and a first input end of the drive signal output circuit respectively; a load communication end of the program control circuit and a first output end of the switching circuit are both electrically connected with the USB port; a second output end of the switching circuit is the power supplement end of the power conversion control device; a first output end of the program control circuit is electrically connected with a control end of the switching circuit; a second output end of the program control circuit is electrically connected with a second input end of the drive signal output circuit; a parallel communication end of the program control circuit is the parallel communication end of the power conversion control device; and an output end of the drive signal output circuit is electrically connected with a control end of the power conversion circuit. In a case where the power conversion control device is the master device or the power supplement device, the power conversion circuit is used for converting the input voltage to obtain the output power under the action of a drive signal, and the drive signal is used for driving a switch tube in the power conversion circuit to be turned on or turned off. The sampling circuit is used for collecting the output power to obtain a sampling power, and transmitting the sampling power to the drive signal output circuit and the program control circuit respectively. ​ The program control circuit is configured to communicate with the master 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 sampling power, and transmit the maximum power to the drive signal output circuit; The drive signal output circuit is configured to obtain the drive signal according to the sampling power and the maximum power, and transmit the drive signal to the power conversion circuit; The program control circuit is further configured to communicate with the USB port to determine whether to access the load to obtain a second communication result, and control on-off of a switch tube in the switch circuit according to the first communication result and the second communication result.

2. The system of claim 1, wherein, When the number of the loads is one, the at least two power conversion control devices are configured to determine, as the master device, a power conversion control device with a maximum output voltage among a power conversion control device accessing the load and a power conversion control device not accessing the load, and determine, as the power supplement device, the power conversion control device accessing the load and the power conversion control device not accessing the load other than the power conversion control device with the maximum output voltage; Or, When the number of the loads is at least two, the at least two power conversion control devices are configured to determine, as a first power conversion control device, a power conversion control device among a plurality of power conversion control devices accessing the load, determine, as the master device, the first power conversion control device and a power conversion control device with a maximum output voltage among power conversion control devices not accessing the load, and determine, as the power supplement device, the first power conversion control device and the power conversion control devices not accessing the load other than the power conversion control device with the maximum output voltage.

3. The system of claim 1, wherein, The drive signal output circuit comprises a power control circuit and a control voltage output circuit; The first input end of the control voltage output circuit is electrically connected with the output end of the sampling circuit, the second input end of the control voltage output circuit is electrically connected with the second output end of the program control circuit, the output end of the control voltage output circuit is electrically connected with the input end of the power control circuit, and the output end of the power control circuit is electrically connected with the control end of the power conversion circuit; The control voltage output circuit is configured to obtain a control voltage according to the sampling power and the maximum power, and transmit the control voltage to the power control circuit; The power control circuit is configured to generate the drive signal according to the control voltage.

4. The system of claim 3, wherein, The control voltage output circuit comprises a first error amplifier, a second error amplifier and a diode group; The reverse input end of the first error amplifier and the reverse input end of the second error amplifier are electrically connected with the output end of the sampling circuit, the same direction input end of the first error amplifier and the same direction input end of the second error amplifier are electrically connected with the second output end of the program control circuit, the output end of the first error amplifier and the output end of the second error amplifier are electrically connected with the negative electrode of the diode group, and the positive electrode of the diode group is electrically connected with the input end of the power control circuit; The first error amplifier is configured to amplify a current difference between a sampling current in the sampling power and a 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 configured to amplify a voltage difference between a sampling voltage in the sampling power and a reference voltage in the maximum power to obtain a second voltage, and transmit the second voltage to the diode group; The diode group is configured to generate the control voltage according to the first voltage and the second voltage.

5. The system of claim 1, wherein, The sampling circuit comprises a current sampling circuit and a voltage sampling circuit; The input end of the current sampling circuit is configured to collect an output current in the output power, the input end of the voltage sampling circuit is electrically connected with 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 electrically connected with the first input end of the driving signal output circuit; The current sampling circuit is configured to collect the output current to obtain a sampling current in the sampling power; The voltage sampling circuit is configured to collect an output voltage in the output power to obtain a sampling voltage in the sampling power.

6. The system of claim 1, wherein, The switching 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 electrically connected with 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 electrically connected with the first output end of the program control circuit, the second end of the first switch tube is electrically connected with the USB port, and the second end of the second switch tube is the second output end of the switching circuit.

7. A method of output power control, characterized by The method is performed by 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 power conversion control device is configured to access an input voltage, the parallel communication ends of each power conversion control device are electrically connected with each other, the power supplement ends of each power conversion control device are electrically connected with each other, the power output end and the load communication end of each power conversion control device are electrically connected with each USB port, and each USB port is further configured to access a load; the method comprises: The at least two power conversion control devices determine a master device and a power supplement device, and the power supplement device is configured to supplement power to the master device; In the case that the voltage of the load is greater than or equal to the minimum output voltage and less than or equal to the maximum output voltage of the main device and the power supplement device, 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, the first load power being 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 according to the input voltage, the second load power being the sum of the output power of the main device and the output power of the power supplement device.

8. A switching power supply, characterized by comprising: The switching power supply circuit comprises an AC-DC converter and an output power control system as claimed in any one of claims 1-6.

9. A charger chip, characterized by comprising: The output power control system as claimed in any one of claims 1-6 and / or the switching power supply as claimed in claim 8.

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