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CN115333075B - Load distribution control system, method, device and air conditioning equipment for switching power supply - Google Patents

Load distribution control system, method, device and air conditioning equipment for switching power supply Download PDF

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Publication number
CN115333075B
CN115333075B CN202211078265.4A CN202211078265A CN115333075B CN 115333075 B CN115333075 B CN 115333075B CN 202211078265 A CN202211078265 A CN 202211078265A CN 115333075 B CN115333075 B CN 115333075B
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China
Prior art keywords
switching power
power supply
load distribution
distribution control
load
Prior art date
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Application number
CN202211078265.4A
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Chinese (zh)
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CN115333075A (en
Inventor
刘起宏
贺伟衡
靳珂珂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Chongqing Midea General Refrigeration Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Chongqing Midea General Refrigeration Equipment Co Ltd
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Priority to CN202211078265.4A priority Critical patent/CN115333075B/en
Publication of CN115333075A publication Critical patent/CN115333075A/en
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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J1/00—Circuit arrangements for DC mains or DC distribution networks
    • H02J1/10—Parallel operation of DC sources
    • H02J1/102—Parallel operation of DC sources being switching converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)

Abstract

本发明提出了一种开关电源的负载分配控制系统、方法、装置和空调设备。其中，开关电源的负载分配控制系统包括：至少一个开关电源；负载分配控制总线，连接至每个开关电源，为每个开关电源提供负载分配控制信号，负载分配控制信号与每个开关电源的当前负载电流相关，每个开关电源根据负载分配控制信号输出目标负载电流。

The present invention proposes a load distribution control system, method, device and air conditioning equipment for a switching power supply. The load distribution control system for the switching power supply includes: at least one switching power supply; a load distribution control bus connected to each switching power supply, providing a load distribution control signal for each switching power supply, the load distribution control signal is related to the current load current of each switching power supply, and each switching power supply outputs a target load current according to the load distribution control signal.

Description

Load distribution control system, method and device of switching power supply and air conditioning equipment
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a load distribution control system, a load distribution control method, a load distribution control device and air conditioning equipment of a switching power supply.
Background
In the current parallel scheme of the switch power supply, when the load current of each switch power supply is distributed, an additional ORing (OR operation or operation) circuit is often required to be added, and a special control circuit for distributing the load current is required to be added, so that the volume of the parallel system of the switch power supplies is increased, and meanwhile, the manufacturing cost of the parallel system of the switch power supplies is also increased.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
To this end, a first aspect of the present invention is to propose a load distribution control system of a switching power supply.
A second aspect of the present invention is to provide a load distribution method of a switching power supply.
A third aspect of the present invention is to provide a load distribution device of a switching power supply.
A fourth aspect of the present invention is to provide a load distribution device of a switching power supply.
A fifth aspect of the present invention is to provide a load distribution control system of a switching power supply.
A sixth aspect of the invention is directed to a readable storage medium.
A seventh aspect of the present invention is directed to an air conditioning apparatus.
In view of this, according to a first aspect of the present invention, there is provided a load distribution control system for a switching power supply, the control system comprising at least one switching power supply, a load distribution control bus connected to each switching power supply, providing each switching power supply with a load distribution control signal, the load distribution control signal being related to a present load current of each switching power supply, each switching power supply outputting a target load current in accordance with the load distribution control signal.
The load distribution control system of the switching power supply comprises a load distribution control bus and at least one switching power supply. The load distribution control bus is connected to each switching power supply, and the switching power supplies are connected in parallel.
In the use process of the load distribution control system, the load distribution control bus inputs a load distribution control signal to each switching power supply, so that each switching power supply controls the magnitude of the target load current output by itself according to the received load distribution control signal. Wherein the load distribution control signal is embodied as a voltage signal, and the load distribution control signal on the load distribution control bus is related to the current load current of each switching power supply during the use of the load distribution control system.
On the one hand, the load distribution control bus is only increased, and the load distribution control signal on the load distribution control bus is used for controlling the magnitude of the load current output by each switch power supply, so that the internal structure of the load distribution control system is simplified, the volume of the load distribution control system is reduced, and the manufacturing cost of the load distribution control system is reduced.
The load distribution control system of the switching power supply according to the present invention may further have the following additional technical features:
in the above technical solution, the load distribution control signal is related to the sum of the present load currents of each switching power supply.
In this technical solution, during use of the load distribution control system, the load distribution control signal is related to the sum of the present load currents of each switching power supply. In this way, the load distribution control signal on the load distribution control bus is determined according to the sum of the load currents of the switch power supplies, and the load current output by the switch power supplies is controlled according to the load distribution control signal. On one hand, the load current of each switch power supply can be distributed evenly, the problem that the switch power supply works independently to damage the switch power supply due to overlarge load current born by a certain switch power supply is avoided, and therefore the service life of each switch power supply is guaranteed, and on the other hand, the internal structure of the load distribution control system is simplified, the size of the load distribution control system is reduced, and the manufacturing cost of the load distribution control system is reduced.
In any of the above solutions, a primary inductor current sampling signal of the switching power supply is input to a non-inverting input terminal of a PWM comparator of the switching power supply, and an inverting input terminal of the PWM comparator is connected to a load distribution control bus, where the PWM comparator is configured to compare the inductor current sampling signal with the load distribution control signal to determine whether to turn on or off a switching tube of the switching power supply, where the inductor current sampling signal is a product of the primary inductor current of the switching power supply and an inductor current sampling gain.
In this technical scheme, each of the above-mentioned switching power supplies further includes a PWM (Pulse Width Modulation ) comparator, a primary inductor, a switching tube, and an inductor current sampling circuit.
The first end of the inductor current sampling circuit is connected with the primary inductor, the second end of the inductor current sampling circuit is connected with the in-phase input end of the PWM comparator, and the inductor current sampling circuit is used for sampling the current of the primary inductor to obtain an inductor current sampling signal of the switching power supply. That is, the in-phase input signal of the PWM comparator is the inductor current sampling signal.
Further, an inverting input terminal of the PWM comparator is connected to the load distribution control bus. That is, the inverted input signal of the PWM comparator is the above-described load distribution control signal.
Specifically, the duty ratio of the switching transistor is controlled by the PWM comparator described above. The PWM comparator is used for comparing the inductance current sampling signal and the load distribution control signal, and further controlling a switching tube in the switching power supply to be switched on or switched off according to a comparison result, so that the load current of the switching power supply is determined. Therefore, constant-voltage feedback control of the switching power supplies is realized, the load current of each switching power supply can be distributed evenly, and the problems of overload protection or damage of the switching power supplies caused by uneven load current distribution of each switching power supply are avoided, so that the service lives of the switching power supplies are ensured.
In addition, in the practical application process, for each switching power supply, the inductance current sampling signal is the product between the inductance current sampling gain of the switching power supply and the primary inductance current of the switching power supply.
In any of the above solutions, the ratio of the target load currents of the respective switching power supplies is related to the inductance current sampling gain of the respective switching power supplies.
In the technical scheme, when the switching power supplies control the magnitude of target load current output by the switching power supplies according to the received load distribution control signals, the ratio of the target load current output by each switching power supply is related to the inductance current sampling gain of each switching power supply. Therefore, the ratio of the load current output by each switching power supply can be set by setting the inductance current sampling gain of each switching power supply, and convenience in load distribution of each switching power supply is ensured.
According to a second aspect of the present invention, a load distribution method of a switching power supply is provided, the load distribution method including obtaining a present load current of each switching power supply, determining a load distribution control signal according to the present load current, and determining a target load current of the switching power supply according to the load distribution control signal.
The execution main body of the technical scheme of the load distribution method of the switching power supply provided by the invention can be a load distribution device of the switching power supply, and can be determined according to actual use requirements, and the method is not particularly limited. In order to more clearly describe the load distribution method of the switching power supply provided by the invention, a load distribution device using an execution body of the load distribution method of the switching power supply as the switching power supply is described below.
The load distribution method of the switching power supply provided by the invention is used for distributing the load current of the parallel switching power supply, and can be particularly applied to the load distribution control system of the switching power supply in any technical scheme of the first aspect.
Specifically, in the load distribution method of the switching power supply provided by the invention, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, the current actual load current of each switching power supply is obtained, and then a voltage signal, namely the load distribution control signal, is determined according to the actual load current of each switching power supply, and the load distribution control signal is given to the load distribution control bus. On the basis, the load distribution control signal is transmitted to each switching power supply through the load distribution control bus, so that each switching power supply can control the magnitude of the load current output by the switching power supply according to the received load distribution control signal, and each switching power supply can output the target load current.
On the one hand, the load distribution control system ensures that the load current of each switch power supply can be distributed evenly, avoids the problem of overload protection or damage of the switch power supply caused by uneven load current distribution of each switch power supply, and further ensures the service life of each switch power supply.
The load distribution method of the switching power supply according to the present invention may further have the following additional technical features:
in the technical scheme, the load distribution control signal is determined according to the current load current, and the load distribution control signal is determined according to the sum of the current load currents of each switching power supply.
In the technical scheme, a load distribution control signal on a load distribution control bus is determined according to the sum of load currents of all the switching power supplies, and the load current output by all the switching power supplies is controlled according to the load distribution control signal. On one hand, the load current of each switch power supply can be distributed evenly, the problem that the switch power supply works independently to damage the switch power supply due to overlarge load current born by a certain switch power supply is avoided, and therefore the service life of each switch power supply is guaranteed, and on the other hand, the internal structure of the load distribution control system is simplified, the size of the load distribution control system is reduced, and the manufacturing cost of the load distribution control system is reduced.
In any of the above technical solutions, determining the target load current of each switching power supply according to the load distribution control signal includes obtaining a primary inductor current sampling signal of each switching power supply, comparing the load distribution control signal with the inductor current sampling signal, and determining on or off of a switching tube of the switching power supply according to a comparison result to determine the target load current of the switching power supply, wherein the inductor current sampling signal is a product of the primary inductor current and the inductor current sampling gain of the switching power supply.
In the technical scheme, when determining the target load current of each switching power supply, an inductance current sampling signal obtained by sampling an inductance current sampling circuit of each switching power supply is specifically obtained, and a load distribution control signal on a load distribution control bus is obtained. On the basis, the inductance current sampling signal and the load distribution control signal are compared through a PWM comparator, and then a switching tube in the switching power supply is controlled to be switched on or switched off according to a comparison result, so that the load current of the switching power supply is determined. Therefore, constant-voltage feedback control of the switching power supplies is realized, the load current of each switching power supply can be distributed evenly, and the problems of overload protection or damage of the switching power supplies caused by uneven load current distribution of each switching power supply are avoided, so that the service lives of the switching power supplies are ensured.
In addition, it should be noted that, for each switching power supply, the inductor current sampling signal is the product between the inductor current sampling gain of the switching power supply and the primary inductor current of the switching power supply.
In any of the above solutions, the ratio of the target load currents of the respective switching power supplies is related to the inductance current sampling gain of the respective switching power supplies.
In this technical scheme, when the magnitude of the target load current output by each switching power supply is controlled by the load distribution control signal, the ratio between the target load currents output by each switching power supply is related to the inductance current sampling gain of each switching power supply. Therefore, the ratio of the load current output by each switching power supply can be set by setting the inductance current sampling gain of each switching power supply, and convenience in load distribution of each switching power supply is ensured.
According to a third aspect of the present invention, a load distribution device of a switching power supply is provided, and the device includes an acquisition unit configured to acquire a current load current of each switching power supply, a processing unit configured to determine a load distribution control signal according to the current load current, and a processing unit configured to determine a target load current of the switching power supply according to the load distribution control signal.
The load distribution device of the switching power supply provided by the invention is used for distributing the load current of the parallel switching power supply, and can be particularly applied to the load distribution control system of the switching power supply in any technical scheme of the first aspect.
Specifically, in the load distribution device of the switching power supply provided by the invention, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, the current actual load current of each switching power supply is obtained through the obtaining unit, and then a voltage signal, namely the load distribution control signal, is determined through the processing unit according to the actual load current of each switching power supply, and the load distribution control signal is given to the load distribution control bus. On the basis, the load distribution control signal is transmitted to each switching power supply through the load distribution control bus, so that each switching power supply can control the magnitude of the load current output by the switching power supply according to the received load distribution control signal, and each switching power supply can output the target load current.
On the one hand, the load distribution control system ensures that the load current of each switch power supply can be distributed evenly, avoids the problem of overload protection or damage of the switch power supply caused by uneven load current distribution of each switch power supply, and further ensures the service life of each switch power supply.
According to a fourth aspect of the present invention, there is provided a load distribution device for a switching power supply, comprising a memory storing a program or an instruction, and a processor, wherein the processor executes the program or the instruction to implement the steps of the load distribution method for the switching power supply according to any one of the above aspects. Therefore, the load distribution device of the switching power supply according to the fourth aspect of the present invention has all the advantages of the load distribution method of the switching power supply according to any one of the second aspect, and will not be described herein.
According to a fifth aspect of the present invention, a load distribution control system of a switching power supply is provided, which includes a load distribution device of the switching power supply in the fourth aspect. Therefore, the load distribution control system of the switching power supply according to the fifth aspect of the present invention has all the advantages of the load distribution device of the switching power supply according to the fourth aspect, and is not described herein.
According to a sixth aspect of the present invention, there is provided a readable storage medium having stored thereon a program or instructions which, when executed by a processor, implement a load distribution method of a switching power supply as in any of the above-mentioned aspects. Therefore, the readable storage medium according to the sixth aspect of the present invention has all the advantages of the load distribution method of the switching power supply according to any one of the second aspect, and will not be described herein.
According to a seventh aspect of the present invention, there is provided an air conditioning apparatus comprising a load distribution control system of the switching power supply according to any one of the first aspect, or a load distribution control system of the switching power supply according to the fifth aspect. Therefore, the air conditioning apparatus according to the seventh aspect of the present invention has all the advantages of the load distribution control system of the switching power supply according to any one of the first aspect of the present invention, or the air conditioning apparatus according to the seventh aspect of the present invention has all the advantages of the load distribution control system of the switching power supply according to the fifth aspect of the present invention, which are not described herein.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
Fig. 1 shows one of the block diagrams of the load distribution control system of the switching power supply according to the embodiment of the present invention;
FIG. 2 shows a circuit diagram of a single switching power supply of an embodiment of the invention;
FIG. 3 shows a schematic diagram of input signals of a PWM comparator according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of an oscillation signal of an oscillator according to an embodiment of the present invention;
fig. 5 shows one of the flow diagrams of the load distribution method of the switching power supply according to the embodiment of the invention;
FIG. 6 is a second flow chart of a load distribution method of a switching power supply according to an embodiment of the invention;
fig. 7 shows a third flow chart of a load distribution method of the switching power supply according to the embodiment of the invention;
fig. 8 shows one of the block diagrams of the load distribution apparatus of the switching power supply according to the embodiment of the present invention;
fig. 9 shows a second block diagram of a load distribution apparatus of a switching power supply according to an embodiment of the present invention;
FIG. 10 shows a second block diagram of a load distribution control system of a switching power supply according to an embodiment of the present invention;
Fig. 11 shows one of the block diagrams of the air conditioning apparatus according to the embodiment of the present invention;
fig. 12 shows a second block diagram of the air conditioning apparatus according to the embodiment of the present invention.
The correspondence between the reference numerals and the component names in fig. 1 and 2 is:
the load distribution control system of 100 switching power supplies, 102 switching power supplies, 104 load distribution control buses, 106PWM comparators, 108RS triggers, 110 oscillators, 112 inductance current sampling circuits, 114 primary side inductances and 116 switching tubes.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
The load distribution control system, method, device and air conditioning equipment of the switching power supply provided by the embodiment of the application are described in detail below with reference to fig. 1 to 12 through specific embodiments and application scenarios thereof.
First embodiment, fig. 1 shows one of the block diagrams of the load distribution control system of the switching power supply according to the embodiment of the present invention.
As shown in fig. 1, the load distribution control system 100 of the switching power supply according to the present invention includes a load distribution control bus 104 and at least one switching power supply 102. The load distribution control bus 104 is connected to each of the switching power supplies 102, and the switching power supplies 102 are connected in parallel, and the input voltage of the load distribution control system 100 of the switching power supply is V in, and the output voltage of the load distribution control system is V out.
Further, as shown in fig. 1, the output positive terminal of each switching power supply 102 is directly connected, the output negative terminal of each switching power supply 102 is connected to SGND (Signal group), and the input terminal of each switching power supply 102 is directly connected, and each switching power supply 102 is connected to PGND (protection group).
Further, during the use of the load distribution control system, the load distribution control bus 104 inputs a load distribution control signal to each switching power supply 102, so that each switching power supply 102 controls the magnitude of the target load current output by itself according to the received load distribution control signal. In this way, on one hand, the load current of each switch power supply 102 can be distributed evenly, the problem of overload protection of the switch power supply 102 or damage of the switch power supply 102 caused by uneven load current distribution of each switch power supply 102 is avoided, and therefore the service life of each switch power supply 102 is guaranteed, on the other hand, only one load distribution control bus 104 is added, the load current output by each switch power supply 102 is controlled through a load distribution control signal on the load distribution control bus 104, the internal structure of the load distribution control system is simplified, and the manufacturing cost of the load distribution control system is reduced while the volume of the load distribution control system is reduced.
Wherein the load distribution control signal is embodied as a voltage signal, and the load distribution control signal on the load distribution control bus 104 is related to the current load of each switching power supply 102 during use of the load distribution control system.
Specifically, during the use of the load distribution control system, the current actual load current of each switching power supply 102 is obtained, and then a voltage signal, that is, the load distribution control signal, is determined according to the actual load current of each switching power supply 102, and the load distribution control signal is given to the load distribution control bus 104. Based on this, the load distribution control signal is transmitted to each switching power supply 102 through the load distribution control bus 104, so that each switching power supply 102 can control the magnitude of the load current output by itself according to the load distribution control signal received by the switching power supply, so that each switching power supply 102 outputs a corresponding target load current, thereby ensuring the average distribution of the output loads of the switching power supplies 102, and avoiding the problem that the service life of the switching current is damaged due to the fact that the load current borne by a certain switching power supply is too large, and the switching power supply works independently.
In addition, the switching power supply 102 may be a DCM switching power supply controlled by a peak current, and in an actual application process, the switching power supply 102 may be a flyback switching power supply, a forward switching power supply, a Buck switching power supply, or the like. The specific type of the switching power supply 102 may be selected by those skilled in the art according to the actual situation, and is not particularly limited herein.
In summary, in the load distribution control system for a switching power supply according to the present invention, each switching power supply is connected to the load distribution control bus in parallel, and the load distribution control signal on the load distribution control bus is determined according to the load current of each switching power supply, so that the load distribution control signal is transmitted to each switching power supply through the load distribution control bus, so that each switching power supply controls the magnitude of the load current output by itself according to the load distribution control signal received by the switching power supply, and thus outputs the target load current. Therefore, the internal structure of the load distribution control system is simplified, the volume of the load distribution control system is reduced, the manufacturing cost of the load distribution control system is reduced, the load current of each switching power supply can be distributed evenly, the problem of overload protection or damage of the switching power supply caused by uneven load current distribution of each switching power supply is avoided, and the service life of each switching power supply is guaranteed.
In the second embodiment, the manner of determining the load distribution control signal on the load distribution control bus 104 is further limited based on the first embodiment. Specifically, during use of the load distribution control system, the load distribution control signal described above is related to the sum of the present load currents of each switching power supply 102.
Specifically, during the use of the load distribution control system, the current actual load current of each switching power supply 102 is obtained, and then a voltage signal, that is, the load distribution control signal, is determined according to the sum of the actual load currents of each switching power supply 102, and the load distribution control signal is given to the load distribution control bus 104. Based on this, the load distribution control signal is transmitted to each switching power supply 102 through the load distribution control bus 104, so that each switching power supply 102 can control the magnitude of the load current output by itself according to the load distribution control signal received by the switching power supply 102, so that each switching power supply 102 outputs the target load current.
In this way, the load distribution control signal on the load distribution control bus 104 is determined by the sum of the load currents of the respective switching power supplies 102, and the magnitude of the load current output by the respective switching power supplies 102 is controlled by the load distribution control signal. On one hand, the load current of each switch power supply 102 can be distributed evenly, the problem that the switch power supply works independently to damage the switch power supply due to overlarge load current born by a certain switch power supply is avoided, and the service life of each switch power supply is guaranteed.
The load distribution control signal is embodied as a voltage signal, as shown in fig. 2, and each of the switching power supplies 102 includes a first resistor R1 and an optocoupler Q1. On this basis, the load distribution control bus 104 is connected to the power supply voltage VCC of each switching power supply 102 through the first resistor R1, and the current actual load current of each switching power supply 102 may be determined by the output current of the phototransistor Q1.
Specifically, in the actual application process, the load distribution control signal on the load distribution control bus 104 may be determined by the following formula.
Wherein V COMP is the bus voltage on the load distribution control bus 104, i.e. the load distribution control signal, V CC is the power supply voltage of the switching power supply, R 1 is the resistance value of the first resistor R1 in the switching power supply, N is the number of switching power supplies 102 connected in parallel in the load distribution control system, I 1 is the output current of the optocoupler transistor Q1 in the first switching power supply 102, I 2 is the output current of the optocoupler transistor Q1 in the second switching power supply 102, and I N is the output current of the optocoupler transistor Q1 of 102 in the nth switching power supply.
In the third embodiment, as shown in fig. 2, each of the switching power supplies 102 further includes a PWM comparator 106, a primary inductor 114, and an inductor current sampling circuit 112.
As shown in fig. 2, a first end of the inductor current sampling circuit 112 is connected to the primary inductor 114, a second end of the inductor current sampling circuit 112 is connected to the non-inverting input end of the PWM comparator 106, and the inductor current sampling circuit 112 is configured to sample the current of the primary inductor 114 to obtain an inductor current sampling signal V CS of the switching power supply 102.
Further, an inverting input terminal of the PWM comparator 106 is connected to the load distribution control bus 104. That is, the inverted input signal of the PWM comparator 106 is the load distribution control signal V COMP, and the non-inverted input signal of the PWM comparator 106 is the inductor current sampling signal V CS. The schematic diagram of the load distribution control signal V COMP and the inductor current sampling signal V CS input to the PWM comparator 106 is shown in fig. 3, 202 represents the load distribution control signal, and 204 represents the inductor current sampling signal.
On this basis, as shown in fig. 2, each of the switching power supplies 102 further includes a switching tube 116, and the duty ratio of the switching tube 116 is controlled by the PWM comparator 106. Specifically, the PWM comparator 106 is configured to compare the inductor current sampling signal and the load distribution control signal, and further control the switching tube 116 in the switching power supply 102 to be turned on or off according to the comparison result, so as to determine the load current of the switching power supply 102.
When the inductor current sampling signal is greater than or equal to the load distribution control signal, the PWM comparator 106 outputs a high level signal to control the switching tube 116 to be turned off, and at this time, the switching power supply 102 directly outputs a target load current, and when the inductor current sampling signal is less than the load distribution control signal, the PWM comparator 106 outputs a low level signal to control the switching tube 116 to be turned on, so that an output load of the switching power supply 102 is adjusted from a current load current to the target load current and then is output. In this way, through the constant voltage feedback control on the switching power supplies 102, the load current of each switching power supply 102 can be distributed evenly, and the problems of overload protection of the switching power supplies 102 or damage of the switching power supplies 102 caused by uneven load current distribution of each switching power supply 102 are avoided, so that the service life of each switching power supply 102 is ensured.
Specifically, in a practical application process, as shown in fig. 2, each of the switching power supplies 102 further includes an RS flip-flop 108 and an oscillator 110, where a truth table of the RS flip-flop 108 is shown in table 1 below, and an oscillation signal of the oscillator 110 is shown as 302 in fig. 4. At the beginning of each switching cycle, the rising edge of oscillator 110 sets RS flip-flop 108, which turns on switching tube 116 to rise the primary inductor current, which increases the magnitude of the inductor current sampling signal. On this basis, when the amplitude of the inductor current sampling signal rises to be equal to the amplitude of the load distribution control signal, the PWM comparator 106 outputs a high level to reset the RS flip-flop 108, so that the switching tube 116 is turned off, thereby realizing the constant voltage feedback control of the switching power supply 102.
Further, in the practical application process, for each switching power supply 102, the inductor current sampling signal is the product between the inductor current sampling gain of the switching power supply 102 and the inductor current of the primary side.
When the inductor current sampling gain of the switching power supply 102 is set, as shown in fig. 2, the switching power supply 102 may have different inductor current sampling gains by setting the sampling resistor R5 with a corresponding resistance value in the inductor current sampling circuit 112 of the switching power supply 102.
In addition, in the practical application process, the inductor current sampling gain of the switching power supply 102 may also be set by setting a hall sensor and an operational amplifier circuit in the switching power supply 102 and controlling the hall sensor and the operational amplifier circuit. The manner of setting the inductor current sampling gain can be selected by those skilled in the art according to practical situations, and is not particularly limited herein.
TABLE 1 truth table for RS flip-flops
Wherein 0 represents a low level and 1 represents a high level.
In the fourth embodiment, when the switching power supplies 102 control the magnitude of the target load current outputted by themselves according to the received load distribution control signal, the ratio of the target load currents outputted by the respective switching power supplies 102 is related to the inductor current sampling gain of the respective switching power supplies 102. In this way, by setting the sampling gain of the inductance current of each switching power supply 102, the proportion of the load current output by each switching power supply 102 can be set, and convenience in load distribution of each switching power supply 102 is ensured.
Specifically, during use of the load distribution control system, the inductor current sampling signals of the respective switching power supplies 102 are controlled to equal magnitudes during each switching cycle. Thus, the peak inductor current of each switching power supply 102 is determined by the inductor current sampling gain of that switching power supply 102, and the target load power supply split ratio of each switching power supply 102 is determined by the peak inductor current of that switching power supply 102.
The peak value of the inductor current of the switching power supply 102 is related to the inverse of the sampling gain of the inductor current of the switching power supply 102, and the distribution ratio of the target load power supply of the switching power supply 102 is related to the square of the peak value of the inductor current of the switching power supply 102.
Specifically, in the case where the ratio of the current sampling gains of the respective switching power supplies 102 is Gain1:gain2:. GainN, the ratio of the inductance current peaks of the respective switching power supplies 102 can be determined asBased on this, as can be seen from the working principle of the switching power supply 102, in each switching period, the primary inductor 114 in the switching power supply 102 completely releases the stored energy, and the inductance energy storage formula of the primary inductor 114 is as follows: Where W is the inductance energy storage, L is the inductance, and I is the peak value of the inductance current, it can be known that the inductance energy storage of the primary inductor 114 is determined by the peak value of the inductance current. On the basis, the output power of the switching power supply 102 is given by neglecting losses Where P is the output power of the switching power supply 102, and F S is the switching frequency of the switching power supply 102. It can be seen that, in the case where the inductance and the switching frequency of each switching power supply 102 are identical, the ratio of the output powers of each switching power supply 102 is the ratio of the squares of the peak values of the inductance currents, that is
Accordingly, after each of the switching power supplies 102 is connected in parallel to the load distribution control bus 104, the distribution ratio of the output load of each of the switching power supplies 102 can be set by setting the inductor current sampling gain of each of the switching power supplies 102. Wherein, the ratio of the inductance current sampling gain of each switching power supply 102 is set as 1:1: at 1, the distribution ratio of the load currents of the individual switching power supplies 102 is likewise 1:1:. 1, i.e. an average distribution of the load currents of the individual switching power supplies 102 is achieved.
In summary, in the load distribution control system 100 of the above-mentioned switching power supply according to the embodiment of the present invention, each switching power supply 102 is connected to the load distribution control bus 104 in parallel, and the load distribution control signal on the load distribution control bus 104 is determined according to the sum of the load currents of each switching power supply 102, so that the load distribution control signal is transmitted to each switching power supply 102 through the load distribution control bus 104, so that each switching power supply 102 controls the magnitude of the load current output by itself according to the load distribution control signal received by the switching power supply, thereby outputting the target load current.
It will be appreciated that, as shown in fig. 2, in the case of the no-load distribution control bus 104, because of the inevitable variability of the devices, there is inevitably an error between the reference voltages of R9, R10 and TL431 of each switching power supply 102, which results in an error between the output voltages of each switching power supply 102.
At this time, the total output voltage of each switching power supply 102 after being connected in parallel is the maximum value of the output voltages of each switching power supply 102, that is, the maximum value of the forward deviation. On this basis, the partial voltage of the total output voltage by R9 and R10 of the switching power supply 102 with the largest forward deviation is equal to the reference voltage of TL431, and the switching power supply 102 operates in a normal negative feedback state and assumes the entire output current. For other switching power supplies 102, the output current of the phototransistor Q1 reaches the maximum value, i.e. the ratio of the power supply voltage VCC to the first resistor R 1, because the partial voltage of R9 and R10 to the total output voltage is larger than the reference voltage of TL431At this time, the voltage at the inverting input terminal of the PWM comparator 106 is equal to 0, the switching transistor 116 is not turned on, and the output current of the switching power supply 102 is 0. That is, in the case of the no-load distribution control bus 104, the output power of each switching power supply 102 is severely uneven, and only the switching power supply 102 whose output forward error is largest actually operates.
Therefore, in the embodiment of the invention, the load distribution control signal on the load distribution control bus 104 is determined according to the sum of the load currents of the switch power supplies 102, and the load distribution of the switch power supplies 102 is controlled according to the load distribution control signal, so that the volume and the manufacturing cost of the load distribution control system are reduced, the load currents of the switch power supplies 102 can be distributed evenly, the problem of overload protection of the switch power supplies 102 or damage to the switch power supplies 102 caused by uneven load current distribution of the switch power supplies 102 is avoided, and the service life of the switch power supplies 102 is ensured.
In a fifth embodiment, fig. 5 shows one of the flow charts of the load distribution method of the switching power supply according to the embodiment of the present invention. The load distribution method includes the following steps 402 to 406:
step 402, obtaining the current load current of each switching power supply;
step 404, determining a load distribution control signal according to the present load current;
step 406, determining a target load current of the switching power supply according to the load distribution control signal.
The execution main body of the technical scheme of the load distribution method of the switching power supply provided by the invention can be a load distribution device of the switching power supply, and can be determined according to actual use requirements, and is not particularly limited. In order to more clearly describe the load distribution method of the switching power supply provided by the invention, a load distribution device using an execution body of the load distribution method of the switching power supply as the switching power supply is described below.
Further, the load distribution method of the switching power supply provided by the invention is used for distributing the load current of the parallel switching power supply, and the load distribution method is particularly applicable to the load distribution control system of the switching power supply in any embodiment of the first aspect.
Specifically, in the load distribution method of the switching power supply provided by the invention, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, the current actual load current of each switching power supply is obtained, and then a voltage signal, namely the load distribution control signal, is determined according to the actual load current of each switching power supply, and the load distribution control signal is given to the load distribution control bus. On the basis, the load distribution control signal is transmitted to each switching power supply through the load distribution control bus, so that each switching power supply can control the magnitude of the load current output by the switching power supply according to the received load distribution control signal, and each switching power supply can output the target load current.
On the one hand, the load distribution control system ensures that the load current of each switch power supply can be distributed evenly, avoids the problem of overload protection or damage of the switch power supply caused by uneven load current distribution of each switch power supply, and further ensures the service life of each switch power supply.
Wherein the load distribution control signal is embodied as a voltage signal, and the load distribution control signal on the load distribution control bus is related to the current load current of each switching power supply in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus.
Further, the switching power supply may specifically be a DCM switching power supply controlled by a peak current, and in an actual application process, the switching power supply may specifically be a flyback switching power supply, a forward switching power supply, a Buck switching power supply, or the like. The specific type of the above-mentioned switching power supply may be selected by those skilled in the art according to the actual circumstances, and is not particularly limited herein.
In summary, in the load distribution method of the switching power supply provided by the invention, each switching power supply is connected to the load distribution control bus in parallel, and the load distribution control signal on the load distribution control bus is determined according to the load current of each switching power supply, so that the magnitude of the load current output by each switching power supply is controlled according to the load distribution control signal, and the target load current is output. Therefore, the internal structure of the load distribution control system is simplified, the volume of the load distribution control system is reduced, the manufacturing cost of the load distribution control system is reduced, and the load current of each switching power supply can be distributed evenly, so that the service life of each switching power supply is ensured.
In a sixth embodiment, fig. 6 shows a second flowchart of a load distribution method of the switching power supply according to the embodiment of the invention. The load distribution method includes the following steps 502 to 506:
Step 502, obtaining the current load current of each switching power supply;
step 504, determining a load distribution control signal according to the sum of the current load currents of each switching power supply;
Step 506, determining the target load current of the switching power supply according to the load distribution control signal.
In this embodiment, on the basis of the fifth embodiment, the manner in which the above-described determination of the load distribution control signal by the actual load current of each switching power supply is further defined. In particular, the load distribution control signal described above is related to the sum of the present load currents of each switching power supply.
Specifically, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, the current actual load current of each switching power supply is obtained, and then a voltage signal, namely the load distribution control signal, is determined according to the sum of the actual load currents of each switching power supply, and the load distribution control signal is given to the load distribution control bus. Based on the above, the load distribution control signal is transmitted to each switching power supply through the load distribution control bus, so that each switching power supply can control the magnitude of the load current output by itself according to the load distribution control signal received by the switching power supply, and each switching power supply can output the target load current.
In this way, the load distribution control signal on the load distribution control bus is determined by the sum of the load currents of the switching power supplies, and the magnitude of the load current output by each switching power supply is controlled by the load distribution control signal. On one hand, the load current of each switch power supply can be distributed evenly, the problem that the switch power supply works independently to damage the switch power supply due to overlarge load current born by a certain switch power supply is avoided, and therefore the service life of each switch power supply is guaranteed, and on the other hand, the internal structure of the load distribution control system is simplified, the size of the load distribution control system is reduced, and the manufacturing cost of the load distribution control system is reduced.
The load distribution control signal is embodied as a voltage signal, and each of the switching power supplies includes a first resistor and an optocoupler triode. The load distribution control bus is connected with the power supply voltage end of each switching power supply through a first resistor, and the current actual load current of each switching power supply can be determined through the output current of the optocoupler triode.
On this basis, in the actual application process, the load distribution control signal on the load distribution control bus can be determined by the following formula.
Wherein V COMP is the bus voltage on the load distribution control bus, i.e. the load distribution control signal, V CC is the power supply voltage of the switching power supply, R 1 is the resistance of the first resistor in the switching power supply, N is the number of switching power supplies connected in parallel in the load distribution control system, I 1 is the output current of the optocoupler transistor in the first switching power supply, I 2 is the output current of the optocoupler transistor in the second switching power supply, and I N is the output current of the optocoupler transistor in the nth switching power supply.
In a seventh embodiment, fig. 7 shows a third flowchart of a load distribution method of a switching power supply according to an embodiment of the invention. The load distribution method includes the following steps 602 to 608:
step 602, obtaining the current load current of each switching power supply;
step 604, determining a load distribution control signal according to the current load current;
step 606, obtaining an inductance current sampling signal of a primary inductance of each switching power supply;
Step 608, comparing the inductance current sampling signal with the load distribution control signal, and determining whether the switching tube of the switching power supply is cut off or turned on according to the comparison result of the inductance current sampling signal and the load distribution control signal so as to determine the target load current of the switching power supply;
the inductor current sampling signal is the product of the inductor current sampling gain and the primary inductor current of the switching power supply.
In this embodiment, on the basis of the fifth embodiment or the sixth embodiment, the specific manner of determining the target load current of each switching power supply by the load distribution control signal is further defined. Specifically, each switching power supply further comprises a PWM comparator, a primary inductor, an inductor current sampling circuit and a switching tube. The inductance current sampling circuit is used for sampling the current of the primary inductance to obtain an inductance current sampling signal of the switching power supply, the inverting input signal of the PWM comparator is the load distribution control signal, the non-inverting input signal of the PWM comparator is the inductance current sampling signal, and the duty ratio of the switching tube is controlled by the PWM comparator.
On the basis, when determining the target load current of each switching power supply, an inductance current sampling signal obtained by sampling an inductance current sampling circuit of each switching power supply is specifically obtained, and a load distribution control signal on a load distribution control bus is obtained. On the basis, the inductance current sampling signal and the load distribution control signal are compared through a PWM comparator, and then a switching tube in the switching power supply is controlled to be switched on or switched off according to a comparison result, so that the load current of the switching power supply is determined.
The PWM comparator outputs a high-level signal to control the switching tube to be disconnected when the inductance current sampling signal is larger than or equal to the load distribution control signal, and directly outputs a target load current when the inductance current sampling signal is smaller than the load distribution control signal, and outputs a low-level signal to control the switching tube to be conducted when the inductance current sampling signal is smaller than the load distribution control signal, so that the output load of the switching tube is adjusted from the current load current to the target load current and then is output. Therefore, through constant voltage feedback control of the switching power supplies, the load current of each switching power supply can be distributed evenly, the problem of overload protection or damage of the switching power supplies caused by uneven load current distribution of each switching power supply is avoided, and the service life of each switching power supply is guaranteed.
Specifically, in practical application, each of the switching power supplies further includes an RS flip-flop and an oscillator. At the beginning of each switching cycle, the rising edge of the oscillator sets the RS flip-flop, thus turning on the switching tube to raise the primary inductor current, thus increasing the magnitude of the inductor current sampling signal. On the basis, when the amplitude of the inductance current sampling signal rises to be equal to the amplitude of the load distribution control signal, the PWM comparator outputs a high level so as to reset the RS trigger, and the switching tube is disconnected, so that constant-voltage feedback control of the switching power supply is realized.
Further, it should be noted that, for each switching power supply, the inductor current sampling signal is a product between the inductor current sampling gain of the switching power supply and the inductor current of the primary side of the switching power supply.
When the inductance current sampling gain of the switching power supply is set, the sampling resistor with the corresponding resistance value can be set in the inductance current sampling circuit of the switching power supply, so that the switching power supply has different inductance current sampling gains.
In addition, in the practical application process, the inductance current sampling gain of the switching power supply can be set by arranging a Hall sensor and an operational amplifier circuit in the switching power supply and controlling the Hall sensor and the operational amplifier circuit. The manner of setting the inductor current sampling gain can be selected by those skilled in the art according to practical situations, and is not particularly limited herein.
In the eighth embodiment, on the basis of the fifth to seventh embodiments described above, when the magnitude of the target load current output by each switching power supply is controlled by the load distribution control signal, the ratio between the target load currents output by each switching power supply is related to the inductor current sampling gain of each switching power supply. Therefore, the ratio of the load current output by each switching power supply can be set by setting the inductance current sampling gain of each switching power supply, and convenience in load distribution of each switching power supply is ensured.
In particular, during use of the load distribution control system, the inductor current sampling signals of the respective switching power supplies are controlled to equal magnitudes during each switching cycle. Thus, the peak value of the inductor current of each switching power supply is determined by the sampling gain of the inductor current of the switching power supply, and the distribution proportion of the target load power supply of each switching power supply is determined by the peak value of the inductor current of the switching power supply.
The peak value of the inductor current of the switching power supply is related to the inverse of the sampling gain of the inductor current of the switching power supply, and the distribution proportion of the target load power supply of the switching power supply is related to the square of the peak value of the inductor current of the switching power supply.
Specifically, in the case where the ratio of the current sampling gains of the respective switching power supplies is Gain1:gain2:. GainN, the ratio of the inductance current peaks of the respective switching power supplies can be determined asBased on the above, the working principle of the switching power supply can know that in each switching period, the primary side inductor in the switching power supply completely releases the stored energy, and the inductance energy storage formula of the primary side inductor is as follows: Wherein, W is inductance energy storage, L is inductance, and I is inductance current peak value, so that the inductance energy storage is determined by the inductance current peak value. At this time, when the loss is ignored, the output power of the switching power supply is Wherein P is the output power of the switching power supply, and F S is the switching frequency of the switching power supply. It can be seen that, when the inductance and the switching frequency of each switching power supply are identical, the ratio of the output powers of each switching power supply is the ratio of the squares of the peak values of the inductance current, that is
Accordingly, after each switching power supply is connected in parallel to the load distribution control bus, the distribution ratio of the output load of each switching power supply can be set by setting the inductor current sampling gain of each switching power supply. When the ratio of the inductance current sampling gain of each switching power supply is set to be 1:1:. 1, the distribution ratio of the load current of each switching power supply is also 1:1:. 1, namely the average distribution of the load current of each switching power supply is realized.
In a ninth embodiment, fig. 8 is a block diagram showing a load distribution apparatus 700 of a switching power supply according to an embodiment of the present invention. The load distribution device includes an acquisition unit 702 and a processing unit 704:
an obtaining unit 702, configured to obtain a present load current of each switching power supply;
A processing unit 704, configured to determine a load distribution control signal according to the present load current;
The processing unit 704 is further configured to determine a target load current of the switching power supply according to the load distribution control signal.
The load distribution device of the switching power supply provided by the invention is used for distributing the load current of the parallel switching power supply, and can be particularly applied to the load distribution control system of the switching power supply in any embodiment of the first aspect.
Specifically, in the load distribution device of the switching power supply provided by the invention, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, the current actual load current of each switching power supply is obtained through the obtaining unit, and then a voltage signal, namely the load distribution control signal, is determined through the processing unit according to the actual load current of each switching power supply, and the load distribution control signal is given to the load distribution control bus. On the basis, the load distribution control signal is transmitted to each switching power supply through the load distribution control bus, so that each switching power supply can control the magnitude of the load current output by the switching power supply according to the received load distribution control signal, and each switching power supply can output the target load current.
On the one hand, the load distribution control system ensures that the load current of each switch power supply can be distributed evenly, avoids the problem of overload protection or damage of the switch power supply caused by uneven load current distribution of each switch power supply, and further ensures the service life of each switch power supply.
Wherein the load distribution control signal is embodied as a voltage signal, and the load distribution control signal on the load distribution control bus is related to the current load current of each switching power supply in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus.
Further, the switching power supply may specifically be a DCM switching power supply controlled by a peak current, and in an actual application process, the switching power supply may specifically be a flyback switching power supply, a forward switching power supply, a Buck switching power supply, or the like. The specific type of the above-mentioned switching power supply may be selected by those skilled in the art according to the actual circumstances, and is not particularly limited herein.
In summary, according to the load distribution device for the switching power supply provided by the invention, the load distribution control signal on the load distribution control bus is determined according to the load current of each switching power supply, and the magnitude of the load current output by each switching power supply is controlled according to the load distribution control signal, so that the target load current is output. Therefore, the internal structure of the load distribution control system is simplified, the volume of the load distribution control system is reduced, the manufacturing cost of the load distribution control system is reduced, and the load current of each switching power supply can be distributed evenly, so that the service life of each switching power supply is ensured.
In this embodiment, the processing unit 704 is further specifically configured to determine the load distribution control signal according to a sum of the present load currents of each switching power supply.
In this embodiment, the obtaining unit 702 is further configured to obtain an inductor current sampling signal of a primary inductor of each switching power supply, and the processing unit 704 is specifically configured to compare the inductor current sampling signal with a load distribution control signal, and determine whether a switching tube of the switching power supply is turned off or turned on according to a comparison result of the inductor current sampling signal and the load distribution control signal, so as to determine a target load current of the switching power supply, where the inductor current sampling signal is a product of an inductor current sampling gain of the switching power supply and a primary inductor current.
In this embodiment, further, the ratio of the target load currents of the respective switching power supplies is related to the inductor current sampling gain of the respective switching power supplies.
Therefore, the ratio of the load current output by each switching power supply can be set by setting the inductance current sampling gain of each switching power supply, and convenience in load distribution of each switching power supply is ensured.
Embodiment ten, fig. 9 shows a block diagram of a load distribution apparatus 800 of a switching power supply according to an embodiment of the present invention. The load distribution device 800 of the switching power supply includes:
A memory 802, the memory 802 having stored thereon programs or instructions;
The processor 804, when the processor 804 executes the above program or instructions, implements the steps of the load distribution method of the switching power supply in any of the embodiments described above.
The load distribution device 800 of the switching power supply provided in this embodiment includes a memory 802 and a processor 804, and when the program or the instruction in the memory 802 is executed by the processor 804, the steps of the load distribution method of the switching power supply in any of the embodiments are implemented, so that the load distribution device 800 of the switching power supply has all the advantages of the load distribution method of the switching power supply in any of the embodiments described above, and will not be described herein.
In particular, the memory 802 and the processor 804 may be connected by a bus or other means. The Processor 804 may include one or more processing units, and the Processor 804 may be a central processing unit (Central Processing Unit, CPU), a digital signal Processor (DIGITAL SIGNAL Processor, DSP), an Application SPECIFIC INTEGRATED Circuit (ASIC), a field programmable gate array (Field Programmable GATE ARRAY, FPGA), or the like.
Embodiment eleven, fig. 10 shows a block diagram of a load distribution control system 900 of a switching power supply according to an embodiment of the present invention, where the load distribution control system 900 of a switching power supply includes a load distribution device 800 of a switching power supply in the foregoing embodiment.
The load distribution control system 900 of the switching power supply according to the embodiment of the present invention includes the load distribution device 800 of the switching power supply in the above embodiment, so that the load distribution control system 900 of the switching power supply has all the advantages of the load distribution device 800 of the switching power supply in the above embodiment, and will not be described herein.
Embodiment twelve, an embodiment of the sixth aspect of the present invention proposes a readable storage medium. On which a program or instructions is stored which, when executed by a processor, implement the steps of the load distribution method of a switching power supply as in any of the embodiments described above.
The readable storage medium according to the embodiment of the present invention may implement the steps of the load distribution method of the switching power supply according to any one of the embodiments described above when the stored program or instructions are executed by the processor. Therefore, the readable storage medium has all the advantages of the load distribution method of the switching power supply in any of the above embodiments, and will not be described herein.
In particular, the above-described readable storage medium may include any medium capable of storing or transmitting information. Examples of readable storage media include electronic circuitry, semiconductor Memory devices, read-Only Memory (ROM), random-access Memory (Random Access Memory, RAM), compact-disk Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM), flash Memory, erasable ROM (EROM), magnetic tape, floppy disk, optical disk, hard disk, fiber optic media, radio Frequency (RF) links, optical data storage devices, and the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.
Embodiment twelve, fig. 11 shows a block diagram of an air conditioning apparatus 1000 according to an embodiment of the present invention, where the air conditioning apparatus 1000 includes a load distribution control system 100 of a switching power supply according to any of the embodiments of the first aspect.
The air conditioning apparatus 1000 provided in the embodiment of the present invention includes the load distribution control system 100 of the switching power supply in any one of the embodiments of the first aspect, so that the air conditioning apparatus 1000 has all the advantages of the load distribution control system 100 of the switching power supply in any one of the embodiments of the first aspect, which are not described herein.
Embodiment thirteen, fig. 12 shows a block diagram of an air conditioning apparatus 1100 according to an embodiment of the present invention, where the air conditioning apparatus 1100 includes a load distribution control system 900 of a switching power supply according to the fifth aspect of the present invention.
The air conditioning apparatus 1100 provided by the embodiment of the present invention includes the load distribution control system 900 of the switching power supply in the fifth embodiment, so that the air conditioning apparatus 1100 has all the advantages of the load distribution control system 900 of the switching power supply in the fifth embodiment, which are not described herein.
In the description of this specification, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying any particular importance unless otherwise expressly specified or limited, the terms "connected," "mounted," "secured," and the like are to be construed broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected, or directly connected, or indirectly connected via an intervening medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1.一种开关电源的负载分配控制系统，其特征在于，包括：1. A load distribution control system for a switching power supply, comprising: 至少一个开关电源；at least one switching power supply; 负载分配控制总线，连接至每个所述开关电源，为每个所述开关电源提供负载分配控制信号，所述负载分配控制信号与每个所述开关电源的当前负载电流相关，A load distribution control bus is connected to each of the switching power supplies and provides a load distribution control signal to each of the switching power supplies, wherein the load distribution control signal is related to a current load current of each of the switching power supplies. 每个所述开关电源根据所述负载分配控制信号输出目标负载电流；Each of the switching power supplies outputs a target load current according to the load distribution control signal; 所述开关电源的PWM比较器的同相输入端输入所述开关电源的原边电感电流采样信号，以及所述PWM比较器的反相输入端连接至所述负载分配控制总线，所述PWM比较器用于将所述电感电流采样信号与所述负载分配控制信号进行比较，以确定导通或切断所述开关电源的开关管，The non-inverting input terminal of the PWM comparator of the switching power supply inputs the primary inductor current sampling signal of the switching power supply, and the inverting input terminal of the PWM comparator is connected to the load sharing control bus, and the PWM comparator is used to compare the inductor current sampling signal with the load sharing control signal to determine whether to turn on or off the switch tube of the switching power supply. 其中，所述电感电流采样信号是所述开关电源的原边电感电流与电感电流采样增益之积；Wherein, the inductor current sampling signal is the product of the primary inductor current of the switching power supply and the inductor current sampling gain; 其中，在对所述开关电源的所述电感电流采样增益进行设置时，在所述开关电源的电感电流采样电路中设置相应阻值的采样电阻；Wherein, when setting the inductor current sampling gain of the switching power supply, a sampling resistor of a corresponding resistance value is set in the inductor current sampling circuit of the switching power supply; 其中，每个开关电源根据接收到的负载分配控制信号对自身输出的负载电流进行控制，使每个开关电源输出相应的目标负载电流。Each switching power supply controls the load current output by itself according to the received load distribution control signal, so that each switching power supply outputs the corresponding target load current. 2.根据权利要求1所述的开关电源的负载分配控制系统，其特征在于，所述负载分配控制信号与每个所述开关电源的当前负载电流之和相关。2 . The load distribution control system of the switching power supply according to claim 1 , wherein the load distribution control signal is related to the sum of the current load currents of each of the switching power supplies. 3 . 3.根据权利要求1所述的开关电源的负载分配控制系统，其特征在于，各个所述开关电源的所述目标负载电流之比，与各个所述开关电源的所述电感电流采样增益相关。3. The load distribution control system of the switching power supply according to claim 1, characterized in that the ratio of the target load currents of each of the switching power supplies is related to the inductor current sampling gain of each of the switching power supplies. 4.一种开关电源的负载分配方法，其特征在于，所述负载分配方法包括：4. A load distribution method for a switching power supply, characterized in that the load distribution method comprises: 获取每个开关电源的当前负载电流；Get the current load current of each switching power supply; 根据所述当前负载电流确定负载分配控制信号；Determining a load distribution control signal according to the current load current; 根据所述负载分配控制信号确定所述开关电源的目标负载电流；Determining a target load current of the switching power supply according to the load distribution control signal; 所述根据所述负载分配控制信号确定每个所述开关电源的目标负载电流，包括：Determining the target load current of each of the switching power supplies according to the load distribution control signal includes: 获取每个所述开关电源的原边电感电流采样信号；Acquire a primary inductor current sampling signal of each of the switching power supplies; 比较所述负载分配控制信号与所述电感电流采样信号，并根据比较结果确定所述开关电源的开关管的导通或切断，以确定所述开关电源的目标负载电流，Comparing the load distribution control signal with the inductor current sampling signal, and determining whether to turn on or off the switch tube of the switching power supply according to the comparison result to determine the target load current of the switching power supply, 所述电感电流采样信号是所述开关电源的原边电感电流与电感电流采样增益之积；The inductor current sampling signal is the product of the primary inductor current of the switching power supply and the inductor current sampling gain; 其中，所述开关电源具备不同的所述电感电流采样增益；Wherein, the switching power supply has different inductor current sampling gains; 其中，每个开关电源根据接收到的负载分配控制信号对自身输出的负载电流进行控制，使每个开关电源输出相应的目标负载电流。Each switching power supply controls the load current output by itself according to the received load distribution control signal, so that each switching power supply outputs the corresponding target load current. 5.根据权利要求4所述的开关电源的负载分配方法，其特征在于，所述根据所述当前负载电流确定负载分配控制信号，包括：5. The load distribution method of the switching power supply according to claim 4, characterized in that the step of determining the load distribution control signal according to the current load current comprises: 根据每个所述开关电源的当前负载电流之和确定所述负载分配控制信号。The load distribution control signal is determined according to the sum of the current load currents of each of the switching power supplies. 6.根据权利要求4所述的开关电源的负载分配方法，其特征在于，6. The load distribution method of the switching power supply according to claim 4, characterized in that: 各个所述开关电源的所述目标负载电流之比，与各个所述开关电源的所述电感电流采样增益相关。The ratio of the target load currents of the switching power supplies is related to the inductor current sampling gain of the switching power supplies. 7.一种开关电源的负载分配装置，其特征在于，所述负载分配装置包括：7. A load distribution device for a switching power supply, characterized in that the load distribution device comprises: 获取单元，用于获取每个开关电源的当前负载电流；An acquisition unit, used for acquiring the current load current of each switching power supply; 处理单元，用于根据所述当前负载电流确定负载分配控制信号；A processing unit, configured to determine a load distribution control signal according to the current load current; 所述处理单元，还用于根据所述负载分配控制信号确定所述开关电源的目标负载电流；The processing unit is further used to determine the target load current of the switching power supply according to the load distribution control signal; 所述获取单元还用于：获取每个所述开关电源的原边电感的电感电流采样信号；The acquisition unit is further used to: acquire an inductor current sampling signal of the primary inductor of each of the switching power supplies; 所述处理单元具体用于：将所述电感电流采样信号与所述负载分配控制信号进行比较，并根据二者的比较结果确定所述开关电源的开关管的切断或者导通，以对所述开关电源的所述目标负载电流进行确定；The processing unit is specifically used to: compare the inductor current sampling signal with the load distribution control signal, and determine whether to cut off or turn on the switch tube of the switching power supply according to the comparison result of the two, so as to determine the target load current of the switching power supply; 其中，所述电感电流采样信号为所述开关电源的电感电流采样增益与原边电感电流的乘积，所述开关电源具备不同的所述电感电流采样增益；The inductor current sampling signal is the product of the inductor current sampling gain of the switching power supply and the primary inductor current, and the switching power supply has different inductor current sampling gains; 其中，每个开关电源根据接收到的负载分配控制信号对自身输出的负载电流进行控制，使每个开关电源输出相应的目标负载电流。Each switching power supply controls the load current output by itself according to the received load distribution control signal, so that each switching power supply outputs the corresponding target load current. 8.一种开关电源的负载分配装置，其特征在于，包括：8. A load distribution device for a switching power supply, comprising: 存储器，存储有程序或指令；Memory, storing programs or instructions; 处理器，所述处理器执行所述程序或指令时实现如权利要求4至6中任一项所述的开关电源的负载分配方法的步骤。A processor, wherein when executing the program or instruction, the processor implements the steps of the load distribution method of the switching power supply according to any one of claims 4 to 6. 9.一种开关电源的负载分配控制系统，其特征在于，包括：9. A load distribution control system for a switching power supply, characterized by comprising: 如权利要求8所述的开关电源的负载分配装置。The load distribution device of the switching power supply as claimed in claim 8. 10.一种可读存储介质，其上存储有程序或指令，其特征在于，所述程序或指令被处理器执行时实现如权利要求4至6中任一项所述的开关电源的负载分配方法的步骤。10. A readable storage medium having a program or instruction stored thereon, wherein when the program or instruction is executed by a processor, the steps of the load distribution method of the switching power supply according to any one of claims 4 to 6 are implemented. 11.一种空调设备，其特征在于，包括：11. An air conditioning device, comprising: 如权利要求1至3中任一项所述的开关电源的负载分配控制系统；或者A load distribution control system for a switching power supply according to any one of claims 1 to 3; or 如权利要求9所述的开关电源的负载分配控制系统。The load distribution control system of the switching power supply as claimed in claim 9.
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