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

Abstract

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

Technical Field

[0001] The present invention relates to the technical field of switching power supplies, and in particular to a load distribution control system, method, device and air conditioning equipment of a switching power supply. Background Art

[0002] In the current parallel scheme of switching power supplies, when distributing the load current of each switching power supply, it is often necessary to add additional ORing (or calculation, or operation) circuits, as well as a control circuit dedicated to load current distribution. This increases the volume of the multi-switch power supply parallel system and also increases the manufacturing cost of the multi-switch power supply parallel system. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention is to provide a load distribution control system for a switching power supply.

[0005] A second aspect of the present invention is to provide a load distribution method for a switching power supply.

[0006] A third aspect of the present invention is to provide a load distribution device for a switching power supply.

[0007] A fourth aspect of the present invention is to provide a load distribution device for a switching power supply.

[0008] A fifth aspect of the present invention is to provide a load distribution control system for a switching power supply.

[0009] A sixth aspect of the present invention is to provide a readable storage medium.

[0010] A seventh aspect of the present invention is to provide an air conditioning device.

[0011] In view of this, according to a first aspect of the present invention, a load distribution control system for a switching power supply is proposed, the control system comprising: 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 being related to the current load current of each switching power supply, and each switching power supply outputting a target load current according to the load distribution control signal.

[0012] The load distribution control system of the switching power supply proposed by the present invention comprises a load distribution control bus and at least one switching power supply, wherein the load distribution control bus is connected to each switching power supply, and each switching power supply is connected in parallel.

[0013] During the use 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. The load distribution control signal is specifically a voltage signal. During the use of the load distribution control system, the load distribution control signal on the load distribution control bus is related to the current load current of each switching power supply.

[0014] In this way, on the one hand, it is ensured that the load current of each switching power supply can be evenly distributed, avoiding the problem of switching power supply overload protection or switching power supply damage caused by uneven load current distribution of each switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, only one load distribution control bus is added, and the load current output by each switching power supply is controlled by the load distribution control signal on the load distribution control bus, which simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0015] The load distribution control system of the switching power supply according to the present invention may also have the following additional technical features:

[0016] In the above technical solution, the load distribution control signal is related to the sum of the current load currents of each switching power supply.

[0017] In this technical solution, during the use of the load distribution control system, the load distribution control signal is related to the sum of the current load currents of each switching power supply. In this way, the load distribution control signal on the load distribution control bus is determined by the sum of the load currents of each switching power supply, and then the load distribution control signal is used to control the load current output by each switching power supply. On the one hand, it ensures that the load current of each switching power supply can be evenly distributed, avoiding the problem that the load current borne by a certain switching power supply is too large, causing the switching power supply to work alone and thus damaging the switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, it simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0018] In any of the above technical solutions, 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, 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.

[0019] In this technical solution, each of the above-mentioned switching power supplies also includes a PWM (Pulse Width Modulation) comparator, a primary inductor, a switch tube and an inductor current sampling circuit.

[0020] The first end of the inductor current sampling circuit is connected to the primary inductor, and the second end of the inductor current sampling circuit is connected to the non-inverting input end of the PWM comparator. The inductor current sampling circuit is used to sample the current of the primary inductor to obtain the inductor current sampling signal of the switching power supply. That is, the non-inverting input signal of the PWM comparator is the inductor current sampling signal.

[0021] Furthermore, the inverting input terminal of the PWM comparator is connected to the load distribution control bus. In other words, the inverting input signal of the PWM comparator is the load distribution control signal.

[0022] Specifically, the duty cycle of the switch tube is controlled by the above-mentioned PWM comparator. The above-mentioned PWM comparator is used to compare the above-mentioned inductor current sampling signal and the load distribution control signal, and then control the switch tube in the switching power supply to be turned on or off according to the comparison result, so as to determine the load current of the switching power supply. In this way, constant voltage feedback control of the switching power supply is realized, ensuring that the load current of each switching power supply can be evenly distributed, avoiding the problem of switching power supply overload protection or switching power supply damage caused by uneven load current distribution of each switching power supply, thereby ensuring the service life of each switching power supply.

[0023] In addition, in actual application, for each switching power supply, the inductor current sampling signal is the product of the inductor current sampling gain of the switching power supply and the primary inductor current.

[0024] In any of the above technical solutions, 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.

[0025] In this technical solution, when the switching power supply controls the magnitude of the target load current output by itself according to the received load distribution control signal, the ratio of the target load current output by each switching power supply is related to the inductor current sampling gain of each switching power supply. In this way, by setting the inductor current sampling gain of each switching power supply, the ratio of the load current output by each switching power supply can be set, thereby ensuring the convenience of load distribution of each switching power supply.

[0026] According to a second aspect of the present invention, a load distribution method for a switching power supply is proposed, the load distribution method comprising: obtaining a current load current of each switching power supply; determining a load distribution control signal according to the current load current; and determining a target load current of the switching power supply according to the load distribution control signal.

[0027] The technical solution of the load distribution method of the switching power supply provided by the present invention can be implemented by a load distribution device of the switching power supply, and can also be determined according to actual use requirements, which is not specifically limited here. In order to more clearly describe the load distribution method of the switching power supply provided by the present invention, the following description is based on the implementation of the load distribution method of the switching power supply as a load distribution device of the switching power supply.

[0028] The load distribution method of the switching power supply provided by the present invention is used to distribute the load current of the parallel switching power supplies. The load distribution method can be specifically applied to the load distribution control system of the switching power supply in any technical solution of the first aspect mentioned above.

[0029] Specifically, in the load distribution method of the switching power supply provided by the present invention, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, the actual load current of each switching power supply is obtained, and then a voltage signal, i.e., 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 assigned to the load distribution control bus. On this 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 size of the load current output by itself according to the received load distribution control signal, so that each switching power supply outputs the target load current.

[0030] In this way, on the one hand, it is ensured that the load current of each switching power supply can be evenly distributed, avoiding the problem of switching power supply overload protection or switching power supply damage caused by uneven load current distribution of each switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, the load current output by each switching power supply is controlled by the load distribution control signal on the load distribution control bus, which simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0031] The load distribution method of the switching power supply according to the present invention may also have the following additional technical features:

[0032] In the above technical solution, determining the load distribution control signal according to the current load current includes: determining the load distribution control signal according to the sum of the current load currents of each switching power supply.

[0033] In this technical solution, the load distribution control signal on the load distribution control bus is determined by the sum of the load currents of each switching power supply, and then the load distribution control signal is used to control the load current output by each switching power supply. On the one hand, it ensures that the load current of each switching power supply can be evenly distributed, avoiding the problem that a certain switching power supply bears too much load current, causing the switching power supply to work alone and thus damaging the switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, it simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0034] In any of the above technical solutions, the target load current of each switching power supply is determined according to the load distribution control signal, including: obtaining the primary inductor current sampling signal of each switching power supply; comparing the load distribution control signal with the inductor current sampling signal, and determining the conduction or disconnection of the switch tube of the switching power supply according to the comparison result to determine the target load current of the switching power supply, and the inductor current sampling signal is the product of the primary inductor current of the switching power supply and the inductor current sampling gain.

[0035] In this technical solution, when determining the target load current of each switching power supply, the inductor current sampling signal obtained by sampling the inductor current sampling circuit of each switching power supply is specifically obtained, and the load distribution control signal on the load distribution control bus is obtained. On this basis, the above-mentioned inductor current sampling signal and the load distribution control signal are compared by a PWM comparator, and then the switch tube in the switching power supply is controlled to be turned on or off according to the comparison result, so as to determine the load current of the switching power supply. In this way, constant voltage feedback control of the switching power supply is realized, ensuring that the load current of each switching power supply can be evenly distributed, avoiding the problem of overload protection of the switching power supply or damage to the switching power supply caused by uneven load current distribution of each switching power supply, thereby ensuring the service life of each switching power supply.

[0036] In addition, it should be noted that, for each switching power supply, the inductor current sampling signal is the product of the inductor current sampling gain of the switching power supply and the primary inductor current thereof.

[0037] In any of the above technical solutions, 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.

[0038] In this technical solution, 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. In this way, by setting the inductor current sampling gain of each switching power supply, the ratio of the load current output by each switching power supply can be set, thereby ensuring the convenience of load distribution of each switching power supply.

[0039] According to a third aspect of the present invention, a load distribution device for a switching power supply is proposed, the device comprising: an acquisition unit, used to acquire the current load current of each switching power supply; a processing unit, used to determine a load distribution control signal according to the current load current; the processing unit is also used to determine a target load current of the switching power supply according to the load distribution control signal.

[0040] The load distribution device of the switching power supply provided by the present invention is used to distribute the load current of the parallel switching power supplies. The load distribution device can be specifically applied to the load distribution control system of the switching power supply in any technical solution of the first aspect above.

[0041] Specifically, the load distribution device of the switching power supply provided by the present invention, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, obtains the actual load current of each switching power supply through the acquisition unit, and then determines a voltage signal, i.e., the load distribution control signal, according to the actual load current of each switching power supply through the processing unit, and assigns the load distribution control signal to the load distribution control bus. On this 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 size of the load current output by itself according to the load distribution control signal it receives, so that each switching power supply outputs the target load current.

[0042] In this way, on the one hand, it is ensured that the load current of each switching power supply can be evenly distributed, avoiding the problem of switching power supply overload protection or switching power supply damage caused by uneven load current distribution of each switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, the load current output by each switching power supply is controlled by the load distribution control signal on the load distribution control bus, which simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0043] According to the fourth aspect of the present invention, a load distribution device for a switching power supply is proposed, comprising: a memory storing a program or instruction; a processor, and when the processor executes the program or instruction, the steps of the load distribution method for the switching power supply in any of the above technical solutions are implemented. Therefore, the load distribution device for the switching power supply proposed in the fourth aspect of the present invention has all the beneficial effects of the load distribution method for the switching power supply in any of the technical solutions in the second aspect, and will not be repeated here.

[0044] According to the fifth aspect of the present invention, a load distribution control system for a switching power supply is provided, comprising: the load distribution device for the switching power supply in the technical solution of the fourth aspect. Therefore, the load distribution control system for the switching power supply provided in the fifth aspect of the present invention has all the beneficial effects of the load distribution device for the switching power supply in the technical solution of the fourth aspect, which will not be described in detail here.

[0045] According to the sixth aspect of the present invention, a readable storage medium is provided, on which a program or instruction is stored, and when the program or instruction is executed by a processor, a load distribution method for a switching power supply as in any of the above technical solutions is implemented. Therefore, the readable storage medium provided in the sixth aspect of the present invention has all the beneficial effects of the load distribution method for a switching power supply in any of the technical solutions in the second aspect, and will not be described in detail here.

[0046] According to the seventh aspect of the present invention, an air conditioning device is proposed, comprising a load distribution control system for a switching power supply as in any technical solution of the first aspect above; or a load distribution control system for a switching power supply as in the technical solution of the fifth aspect above. Therefore, the air conditioning device proposed in the seventh aspect of the present invention has all the beneficial effects of the load distribution control system for a switching power supply in any technical solution of the first aspect above, or the air conditioning device proposed in the seventh aspect of the present invention has all the beneficial effects of the load distribution control system for a switching power supply in the technical solution of the fifth aspect above, which will not be described in detail here.

[0047] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0049] Figure 1 One of the structural block diagrams of the load distribution control system of the switching power supply according to the embodiment of the present invention is shown;

[0050] Figure 2 A circuit diagram of a single switching power supply according to an embodiment of the present invention is shown;

[0051] Figure 3 A schematic diagram of input signals of a PWM comparator according to an embodiment of the present invention is shown;

[0052] Figure 4 A schematic diagram of an oscillation signal of an oscillator according to an embodiment of the present invention is shown;

[0053] Figure 5 A schematic diagram of a flow chart of a load distribution method of a switching power supply according to an embodiment of the present invention is shown;

[0054] Figure 6 A second flow chart of a load distribution method for a switching power supply according to an embodiment of the present invention is shown;

[0055] Figure 7 A third flow chart of a load distribution method for a switching power supply according to an embodiment of the present invention is shown;

[0056] Figure 8 One of the structural block diagrams of the load distribution device of the switching power supply according to the embodiment of the present invention is shown;

[0057] Fig. 9 A second structural block diagram of a load distribution device of a switching power supply according to an embodiment of the present invention is shown;

[0058] Fig.10 The second structural block diagram of the load distribution control system of the switching power supply according to the embodiment of the present invention is shown;

[0059] Fig.11 One of the structural block diagrams of the air conditioning device according to the embodiment of the present invention is shown;

[0060] Fig.12 The second structural block diagram of the air conditioning device according to the embodiment of the present invention is shown.

[0061] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and the component names is as follows:

[0062] 100 load distribution control system of switching power supply, 102 switching power supply, 104 load distribution control bus, 106 PWM comparator, 108 RS trigger, 110 oscillator, 112 inductor current sampling circuit, 114 primary inductor, 116 switch tube. DETAILED DESCRIPTION

[0063] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0064] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0065] Combine the following Figures 1 to 12 , the load distribution control system, method, device and air-conditioning equipment of the switching power supply provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0066] Embodiment 1, Figure 1 One of the structural block diagrams of the load distribution control system of the switching power supply according to the embodiment of the present invention is shown.

[0067] Among them, Figure 1 As shown, the load distribution control system 100 of the switching power supply proposed in 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 switching power supply 102, and each switching power supply 102 is connected in parallel. The input voltage of the load distribution control system 100 of the switching power supply is V in , the output voltage is V out .

[0068] Furthermore, if Figure 1 As shown, the positive output terminals of each switching power supply 102 are directly connected, the negative output terminals of each switching power supply 102 are connected to SGND (Signal Ground), and the input terminals of each switching power supply 102 are directly connected, and each switching power supply 102 is connected to PGND (Protect Ground).

[0069] Furthermore, during the use of the above-mentioned 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 size of the target load current outputted by itself according to the received load distribution control signal. In this way, on the one hand, it is ensured that the load current of each switching power supply 102 can be evenly distributed, avoiding the problem of overload protection of the switching power supply 102 or damage to the switching power supply 102 caused by uneven distribution of the load current of each switching power supply 102, thereby ensuring the service life of each switching power supply 102; on the other hand, only one load distribution control bus 104 is added, and the load current size outputted by each switching power supply 102 is controlled by the load distribution control signal on the load distribution control bus 104, which simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0070] The load distribution control signal is specifically a voltage signal. During the use of the load distribution control system, the load distribution control signal on the load distribution control bus 104 is related to the current load current of each switching power supply 102 .

[0071] Specifically, during the use of the load distribution control system, the actual load current of each switching power supply 102 is obtained, and then a voltage signal, i.e., 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 assigned 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 received load distribution control signal, so that each switching power supply 102 outputs the corresponding target load current, thereby ensuring the average distribution of the output loads of each switching power supply 102, and avoiding the problem that the load current borne by a certain switching power supply is too large, causing the switching power supply to work alone and thus damaging the service life of the switching current.

[0072] In addition, it should be noted that the switching power supply 102 may be a DCM mode switching power supply with peak current control. In actual application, the switching power supply 102 may be a flyback switching power supply, a forward switching power supply, a Buck switching power supply, etc. For the specific type of the switching power supply 102, those skilled in the art may select it according to actual conditions, and no specific limitation is made here.

[0073] In summary, the load distribution control system of the switching power supply proposed by the present invention connects each switching power supply in parallel to the load distribution control bus, and determines the load distribution control signal on the load distribution control bus through the load current of each switching power supply, and then transmits the load distribution control signal 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 received load distribution control signal, thereby outputting the target load current. In this way, while simplifying the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system, and reducing the manufacturing cost of the load distribution control system, it ensures that the load current of each switching power supply can be evenly distributed, avoiding the problem of overload protection of the switching power supply or damage to the switching power supply caused by uneven distribution of the load current of each switching power supply, thereby ensuring the service life of each switching power supply.

[0074] Embodiment 2: In this embodiment, based on Embodiment 1, the determination method of the load distribution control signal on the load distribution control bus 104 is further limited. Specifically, during the use of the load distribution control system, the load distribution control signal is related to the sum of the current load currents of each switching power supply 102.

[0075] Specifically, during the use of the load distribution control system, the actual load current of each switching power supply 102 is obtained, and then a voltage signal, i.e., 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 assigned 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 received load distribution control signal, so that each switching power supply 102 outputs the target load current.

[0076] 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 various switching power supplies 102, and then the load distribution control signal is used to control the load current output by each switching power supply 102. On the one hand, it ensures that the load current of each switching power supply 102 can be evenly distributed, avoiding the problem that a certain switching power supply bears too much load current, causing the switching power supply to work alone and thus damaging the switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, it simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0077] The load distribution control signal is specifically expressed as a voltage signal, such as Figure 2 As shown, each of the switching power supplies 102 includes a first resistor R1 and an optocoupler transistor 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 actual load current of each switching power supply 102 can be determined by the output current of the optocoupler transistor Q1.

[0078] Specifically, in actual application, the load distribution control signal on the load distribution control bus 104 may be determined by the following formula.

[0079]

[0080] Among them, V COMP is the bus voltage on the load distribution control bus 104, that is, the load distribution control signal, V CCis the power supply voltage of the switching power supply, R1 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, I1 is the output current of the optocoupler transistor Q1 in the first switching power supply 102, I2 is the output current of the optocoupler transistor Q1 in the second switching power supply 102, I N is the output current of the optocoupler transistor Q1 of 102 in the Nth switching power supply.

[0081] Embodiment 3, in this embodiment, as Figure 2 As shown, each of the switching power supplies 102 further includes a PWM comparator 106 , a primary inductor 114 and an inductor current sampling circuit 112 .

[0082] Among them, Figure 2 As shown, the first end of the inductor current sampling circuit 112 is connected to the primary inductor 114, and the second end of the inductor current sampling circuit 112 is connected to the non-inverting input end of the PWM comparator 106. The inductor current sampling circuit 112 is used to sample the current of the primary inductor 114 to obtain the inductor current sampling signal V of the switching power supply 102. CS .

[0083] Furthermore, the inverting input terminal of the PWM comparator 106 is connected to the load distribution control bus 104. That is, the inverting input signal of the PWM comparator 106 is the load distribution control signal V COMP , the in-phase input signal of the PWM comparator 106 is the above-mentioned inductor current sampling signal V CS The load distribution control signal V input to the PWM comparator 106 is COMP With the inductor current sampling signal V CS The schematic diagram is as follows Figure 3 As shown, 202 represents the load distribution control signal, and 204 represents the inductor current sampling signal.

[0084] On this basis, if Figure 2 As shown, each of the switching power supplies 102 further includes a switch tube 116, and the duty cycle of the switch tube 116 is controlled by the PWM comparator 106. Specifically, the PWM comparator 106 is used to compare the inductor current sampling signal and the load distribution control signal, and then control the switch 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.

[0085] Wherein, when the above-mentioned inductor current sampling signal is greater than or equal to the above-mentioned load distribution control signal, the PWM comparator 106 outputs a high-level signal to control the switch tube 116 to be turned off, and at this time, the switching power supply 102 directly outputs the target load current; and when the above-mentioned inductor current sampling signal is less than the above-mentioned load distribution control signal, the PWM comparator 106 outputs a low-level signal to control the switch tube 116 to be turned on, so that the output load of the switching power supply 102 is adjusted from the current load current to the above-mentioned target load current before output. In this way, through the constant voltage feedback control of the switching power supply 102, it is ensured that the load current of each switching power supply 102 can be evenly distributed, avoiding the problem of overload protection of the switching power supply 102 or damage to the switching power supply 102 caused by uneven load current distribution of each switching power supply 102, thereby ensuring the service life of each switching power supply 102.

[0086] Specifically, in the actual application process, such as Figure 2 As shown, each of the switching power supplies 102 further includes an RS trigger 108 and an oscillator 110, wherein the truth table of the RS trigger 108 is shown in Table 1 below, and the oscillation signal of the oscillator 110 is shown in Table 1 below. Figure 4 302 in FIG. 302. At the beginning of each switching cycle, the rising edge of the oscillator 110 sets the RS trigger 108, thereby turning on the switch tube 116, so that the primary inductor current rises, thereby increasing the amplitude 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 sharing control signal, the PWM comparator 106 outputs a high level to reset the RS trigger 108, thereby turning off the switch tube 116, thereby realizing the constant voltage feedback control of the switching power supply 102.

[0087] Furthermore, in actual application, for each switching power supply 102 , the inductor current sampling signal is the product of the inductor current sampling gain of the switching power supply 102 and the primary inductor current thereof.

[0088] When the inductor current sampling gain of the switching power supply 102 is set, Figure 2 As shown, the switching power supply 102 can have different inductor current sampling gains by setting a sampling resistor R5 with a corresponding resistance in the inductor current sampling circuit 112 of the switching power supply 102 .

[0089] In addition, in actual application, the inductor current sampling gain of the switching power supply 102 can also be set by setting a Hall sensor and an operational amplifier circuit in the switching power supply 102 and controlling them. For the setting method of the inductor current sampling gain, those skilled in the art can select it according to actual conditions, and no specific limitation is made here.

[0090] Table 1: RS flip-flop truth table

[0091]

[0092] Among them, 0 represents a low level and 1 represents a high level.

[0093] Embodiment 4, in this embodiment, when the switching power supply 102 controls the magnitude of the target load current outputted by itself according to the received load distribution control signal, the ratio of the target load current outputted by each switching power supply 102 is related to the inductor current sampling gain of each switching power supply 102. In this way, by setting the inductor current sampling gain of each switching power supply 102, the ratio of the load current outputted by each switching power supply 102 can be set, thereby ensuring the convenience of load distribution of each switching power supply 102.

[0094] Specifically, during the use of the load distribution control system, in each switching cycle, the inductor current sampling signals of each switching power supply 102 are controlled to have equal amplitudes. Therefore, the inductor current peak value of each switching power supply 102 is determined by the inductor current sampling gain of the switching power supply 102, and the distribution ratio of the target load power of each switching power supply 102 is determined by the inductor current peak value of the switching power supply 102.

[0095] The inductor current peak value of the switching power supply 102 is related to the inverse of the inductor current sampling gain of the switching power supply 102 , and the distribution ratio of the target load power of the switching power supply 102 is related to the square of the inductor current peak value of the switching power supply 102 .

[0096] Specifically, when the ratio of the current sampling gains of each switching power supply 102 is Gain1:Gain2:...GainN, the ratio of the inductor current peak values ​​of each switching power supply 102 can be determined as: On this basis, it can be known from the working principle of the switching power supply 102 that in each switching cycle, the primary inductor 114 in the switching power supply 102 completely releases the stored energy, and the inductor energy storage formula of the primary inductor 114 is: Where W is the inductor energy storage, L is the inductance, and I is the inductor current peak value. It can be seen that the inductor energy storage of the primary inductor 114 is determined by the inductor current peak value. On this basis, ignoring the loss, the output power of the switching power supply 102 is Wherein, P is the output power of the switching power supply 102, F S is the switching frequency of the switching power supply 102. It can be seen that when the inductance and switching frequency of each switching power supply 102 are consistent, the ratio of the output power of each switching power supply 102 is the ratio of the square of the peak value of the inductor current, that is,

[0097] Therefore, after each switching power supply 102 is connected in parallel to the load distribution control bus 104, the distribution ratio of the output load of each switching power supply 102 can be set by setting the inductor current sampling gain of each switching power supply 102. When the ratio of the inductor current sampling gain of each switching power supply 102 is set to 1:1:...:1, the distribution ratio of the load current of each switching power supply 102 is also 1:1:...:1, that is, the average distribution of the load current of each switching power supply 102 is achieved.

[0098] In summary, the load distribution control system 100 of the switching power supply proposed in the embodiment of the present invention connects each switching power supply 102 in parallel to the load distribution control bus 104, and determines the load distribution control signal on the load distribution control bus 104 by the sum of the load currents of each switching power supply 102, and then transmits the load distribution control signal to each switching power supply 102 through the load distribution control bus 104, so that each switching power supply 102 controls the size of the load current output by itself according to the received load distribution control signal, thereby outputting the target load current.

[0099] It is understandable that if Figure 2 As shown, in the case of no load sharing control bus 104, due to the inevitable discreteness of the devices, there will inevitably be errors between the reference voltages of R9, R10 and TL431 of each switching power supply 102, which will also lead to errors between the output voltages of each switching power supply 102.

[0100] At this time, the total output voltage of each switching power supply 102 connected in parallel is the maximum value among the output voltages of each switching power supply 102, that is, the maximum forward deviation. On this basis, the voltage divided by R9 and R10 of the switching power supply 102 with the largest forward deviation on the total output voltage is equal to the reference voltage of TL431, and the switching power supply 102 works in a normal negative feedback state and bears all the output current. For other switching power supplies 102, since the voltage divided by R9 and R10 on the total output voltage is greater than the reference voltage of TL431, the output current of the optocoupler transistor Q1 will reach the maximum value, that is, the ratio of the power supply voltage VCC to the first resistor R1. At this time, the voltage at the inverting input terminal of the PWM comparator 106 is equal to 0, the switch tube 116 is not turned on, and the output current of the switching power supply 102 is 0. In other words, in the case of no load distribution control bus 104, the output power of each switching power supply 102 is seriously uneven, and in fact, only the switching power supply 102 with the largest output forward error is working.

[0101] Therefore, the embodiment of the present invention determines the load distribution control signal on the load distribution control bus 104 by the sum of the load currents of the various switching power supplies 102, and then controls the load distribution of each switching power supply 102 by the load distribution control signal, thereby reducing the volume and manufacturing cost of the load distribution control system, ensuring that the load current of each switching power supply 102 can be evenly distributed, avoiding the problem of overload protection of the switching power supply 102 or damage to the switching power supply 102 caused by uneven load current distribution of each switching power supply 102, thereby ensuring the service life of each switching power supply 102.

[0102] Embodiment 5, Figure 5 One of the flow charts of the load distribution method of the switching power supply according to the embodiment of the present invention is shown. The load distribution method includes the following steps 402 to 406:

[0103] Step 402, obtaining the current load current of each switching power supply;

[0104] Step 404, determining a load distribution control signal according to the current load current;

[0105] Step 406: determine the target load current of the switching power supply according to the load sharing control signal.

[0106] Among them, the execution subject of the technical solution of the load distribution method of the switching power supply provided by the present invention can be a load distribution device of the switching power supply, and can also be determined according to actual use requirements, which is not specifically limited here. In order to more clearly describe the load distribution method of the switching power supply provided by the present invention, the following description is based on the execution subject of the load distribution method of the switching power supply as a load distribution device of the switching power supply.

[0107] Furthermore, the load distribution method for a switching power supply provided by the present invention is used to distribute the load current of parallel switching power supplies. The load distribution method can be specifically applied to the load distribution control system of the switching power supply in any embodiment of the first aspect mentioned above.

[0108] Specifically, in the load distribution method of the switching power supply provided by the present invention, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, the actual load current of each switching power supply is obtained, and then a voltage signal, i.e., 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 assigned to the load distribution control bus. On this 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 size of the load current output by itself according to the received load distribution control signal, so that each switching power supply outputs the target load current.

[0109] In this way, on the one hand, it is ensured that the load current of each switching power supply can be evenly distributed, avoiding the problem of switching power supply overload protection or switching power supply damage caused by uneven load current distribution of each switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, the load current output by each switching power supply is controlled by the load distribution control signal on the load distribution control bus, which simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0110] The load distribution control signal is specifically a voltage signal. In the process of distributing the load currents of the switching power supplies connected in parallel to the load distribution control bus, the load distribution control signal on the load distribution control bus is related to the current load current of each switching power supply.

[0111] Furthermore, the switching power supply may be a DCM mode switching power supply with peak current control. In actual application, the switching power supply may be a flyback switching power supply, a forward switching power supply, a Buck switching power supply, etc. The specific type of the switching power supply may be selected by those skilled in the art according to actual conditions, and no specific limitation is made here.

[0112] In summary, in the load distribution method of the switching power supply proposed in the present invention, each switching power supply is connected in parallel to the load distribution control bus, and the load distribution control signal on the load distribution control bus is determined by the load current of each switching power supply, and then the load current output by each switching power supply is controlled by the load distribution control signal so that it outputs the target load current. In this way, while simplifying the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system, it is ensured that the load current of each switching power supply can be evenly distributed, thereby ensuring the service life of each switching power supply.

[0113] Embodiment 6, Figure 6 The second flow chart of the load distribution method of the switching power supply according to the embodiment of the present invention is shown. The load distribution method includes the following steps 502 to 506:

[0114] Step 502, obtaining the current load current of each switching power supply;

[0115] Step 504, determining a load distribution control signal according to the sum of the current load currents of each switching power supply;

[0116] Step 506: determine the target load current of the switching power supply according to the load distribution control signal.

[0117] In this embodiment, based on the fifth embodiment, the method of determining the load distribution control signal by the actual load current of each switching power supply is further limited. Specifically, the load distribution control signal is related to the sum of the current load currents of each switching power supply.

[0118] Specifically, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, the 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 assigned to the load distribution control bus. Based on this, 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 received load distribution control signal, so that each switching power supply outputs the target load current.

[0119] 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 various switching power supplies, and then the load distribution control signal is used to control the load current output by each switching power supply. On the one hand, it ensures that the load current of each switching power supply can be evenly distributed, avoiding the problem that a certain switching power supply bears too much load current, causing the switching power supply to work alone and thus damaging the switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, it simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0120] The load distribution control signal is specifically expressed as a voltage signal, and each of the switching power supplies includes a first resistor and an optocoupler transistor. The load distribution control bus is connected to the power supply voltage terminal of each switching power supply through the first resistor, and the actual load current of each switching power supply can be determined by the output current of the optocoupler transistor.

[0121] On this basis, in actual application, the load distribution control signal on the load distribution control bus can be determined by the following formula.

[0122]

[0123] Among them, V COMP The bus voltage on the load sharing control bus, that is, the load sharing control signal, V CCis the power supply voltage of the switching power supply, R1 is the resistance value 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, I1 is the output current of the optocoupler transistor in the first switching power supply, I2 is the output current of the optocoupler transistor in the second switching power supply, I N is the output current of the optocoupler transistor in the Nth switching power supply.

[0124] Embodiment 7, Figure 7 The third flow chart of the load distribution method of the switching power supply according to the embodiment of the present invention is shown. The load distribution method includes the following steps 602 to 608:

[0125] Step 602, obtaining the current load current of each switching power supply;

[0126] Step 604, determining a load distribution control signal according to the current load current;

[0127] Step 606, obtaining an inductor current sampling signal of the primary inductor of each switching power supply;

[0128] Step 608, comparing the inductor current sampling signal with the load distribution control signal, and determining 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;

[0129] The inductor current sampling signal is the product of the inductor current sampling gain of the switching power supply and the primary inductor current.

[0130] In this embodiment, on the basis of the fifth or sixth embodiment, the specific method of determining the target load current of each switching power supply through the load distribution control signal is further limited. Specifically, each of the above switching power supplies also includes a PWM comparator, a primary inductor, an inductor current sampling circuit and a switch tube. Among them, the inductor current sampling circuit is used to sample the current of the primary inductor to obtain the inductor current sampling signal of the switching power supply, the inverting input signal of the PWM comparator is the above load distribution control signal, the non-phase input signal of the PWM comparator is the above inductor current sampling signal, and the duty cycle of the switch tube is controlled by the above PWM comparator.

[0131] On this basis, when determining the target load current of each switching power supply, the inductor current sampling signal obtained by sampling the inductor current sampling circuit of each switching power supply is obtained, and the load distribution control signal on the load distribution control bus is obtained. On this basis, the inductor current sampling signal and the load distribution control signal are compared by the PWM comparator, and then the switch tube in the switching power supply is controlled to be turned on or off according to the comparison result, so as to determine the load current of the switching power supply.

[0132] Wherein, when the above-mentioned inductor current sampling signal is greater than or equal to the above-mentioned load distribution control signal, the PWM comparator outputs a high-level signal to control the switch tube to be disconnected, and at this time, the switching power supply directly outputs the target load current; and when the above-mentioned inductor current sampling signal is less than the above-mentioned load distribution control signal, the PWM comparator outputs a low-level signal to control the switch tube to be turned on, so that the output load of the switching power supply is adjusted from the current load current to the above-mentioned target load current before output. In this way, through the constant voltage feedback control of the switching power supply, it is ensured that the load current of each switching power supply can be evenly distributed, avoiding the problem of overload protection of the switching power supply or damage to the switching power supply caused by uneven distribution of the load current of each switching power supply, thereby ensuring the service life of each switching power supply.

[0133] Specifically, in the actual application process, each of the above-mentioned switching power supplies also includes an RS trigger and an oscillator. At the beginning of each switching cycle, the rising edge of the oscillator sets the RS trigger, thereby turning on the switch tube, so that the primary inductor current rises, thereby increasing the amplitude 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 above-mentioned load sharing control signal, the PWM comparator outputs a high level to reset the RS trigger, thereby turning off the switch tube, thereby realizing constant voltage feedback control of the switching power supply.

[0134] Furthermore, it should be noted that, for each switching power supply, the inductor current sampling signal is the product of the inductor current sampling gain of the switching power supply and the primary inductor current thereof.

[0135] When setting the inductor current sampling gain of the switching power supply, a sampling resistor with a corresponding resistance value may be set in the inductor current sampling circuit of the switching power supply so that the switching power supply has different inductor current sampling gains.

[0136] In addition, in actual application, the inductor current sampling gain of the switching power supply can be set by setting a Hall sensor and an operational amplifier circuit in the switching power supply and controlling them. For the setting method of the inductor current sampling gain, those skilled in the art can choose according to actual conditions, and no specific limitation is made here.

[0137] Embodiment 8, in this embodiment, on the basis of the above-mentioned embodiments 5 to 7, 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. In this way, by setting the inductor current sampling gain of each switching power supply, the ratio of the load current output by each switching power supply can be set, thereby ensuring the convenience of load distribution of each switching power supply.

[0138] Specifically, during the use of the load distribution control system, in each switching cycle, the inductor current sampling signals of each switching power supply are controlled to have equal amplitudes. Therefore, the inductor current peak value of each switching power supply is determined by the inductor current sampling gain of the switching power supply, and the distribution ratio of the target load power supply of each switching power supply is determined by the inductor current peak value of the switching power supply.

[0139] The inductor current peak value of the switching power supply is related to the inverse of the inductor current sampling gain of the switching power supply, and the distribution ratio of the target load power supply of the switching power supply is related to the square of the inductor current peak value of the switching power supply.

[0140] Specifically, when the ratio of the current sampling gains of each switching power supply is Gain1:Gain2:...GainN, the ratio of the inductor current peak values ​​of each switching power supply can be determined as: On this basis, it can be known from the working principle of the switching power supply that in each switching cycle, the primary inductor in the switching power supply completely releases the stored energy. The inductor energy storage formula of the primary inductor is: Where W is the inductor energy storage, L is the inductance, and I is the inductor current peak value. It can be seen that the inductor energy storage is determined by the inductor current peak value. At this time, ignoring the loss, the output power of the switching power supply is Where P is the output power of the switching power supply, F S is the switching frequency of the switching power supply. It can be seen that when the inductance and switching frequency of each switching power supply are consistent, the ratio of the output power of each switching power supply is the ratio of the square of the peak value of the inductor current, that is,

[0141] Therefore, after each switching power supply is connected in parallel to the load sharing 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 inductor current sampling gain of each switching power supply is set to 1:1:…:1, the distribution ratio of the load current of each switching power supply is also 1:1:…:1, that is, the average distribution of the load current of each switching power supply is achieved.

[0142] Embodiment 9, Figure 8 The structure block diagram of the load distribution device 700 of the switching power supply according to the embodiment of the present invention is shown. The load distribution device includes an acquisition unit 702 and a processing unit 704:

[0143] An acquisition unit 702, used to acquire the current load current of each switching power supply;

[0144] The processing unit 704 is used to determine a load distribution control signal according to the current load current;

[0145] 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.

[0146] The load distribution device of the switching power supply provided by the present invention is used to distribute the load current of the parallel switching power supplies. The load distribution device can be specifically applied to the load distribution control system of the switching power supply in any embodiment of the first aspect mentioned above.

[0147] Specifically, the load distribution device of the switching power supply provided by the present invention, in the process of distributing the load current of each switching power supply connected in parallel to the load distribution control bus, obtains the actual load current of each switching power supply through the acquisition unit, and then determines a voltage signal, i.e., the load distribution control signal, according to the actual load current of each switching power supply through the processing unit, and assigns the load distribution control signal to the load distribution control bus. On this 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 size of the load current output by itself according to the load distribution control signal it receives, so that each switching power supply outputs the target load current.

[0148] In this way, on the one hand, it is ensured that the load current of each switching power supply can be evenly distributed, avoiding the problem of switching power supply overload protection or switching power supply damage caused by uneven load current distribution of each switching power supply, thereby ensuring the service life of each switching power supply; on the other hand, the load current output by each switching power supply is controlled by the load distribution control signal on the load distribution control bus, which simplifies the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system.

[0149] The load distribution control signal is specifically a voltage signal. In the process of distributing the load currents of the switching power supplies connected in parallel to the load distribution control bus, the load distribution control signal on the load distribution control bus is related to the current load current of each switching power supply.

[0150] Furthermore, the switching power supply may be a DCM mode switching power supply with peak current control. In actual application, the switching power supply may be a flyback switching power supply, a forward switching power supply, a Buck switching power supply, etc. The specific type of the switching power supply may be selected by those skilled in the art according to actual conditions, and no specific limitation is made here.

[0151] In summary, the load distribution device of the switching power supply proposed in the present invention determines the load distribution control signal on the load distribution control bus by the load current of each switching power supply, and then controls the magnitude of the load current output by each switching power supply by the load distribution control signal, so that it outputs the target load current. In this way, while simplifying the internal structure of the load distribution control system, thereby reducing the volume of the load distribution control system and reducing the manufacturing cost of the load distribution control system, it ensures that the load current of each switching power supply can be evenly distributed, thereby ensuring the service life of each switching power supply.

[0152] In this embodiment, further, the processing unit 704 is specifically configured to determine the load distribution control signal according to the sum of the current load currents of each switching power supply.

[0153] In this embodiment, further, the acquisition unit 702 is also used to: acquire the inductor current sampling signal of the primary inductor of each switching power supply; the processing unit 704 is specifically used to: compare the inductor current sampling signal with the load distribution control signal, and determine the cutting off or turning on of 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; wherein, the inductor current sampling signal is the product of the inductor current sampling gain of the switching power supply and the primary inductor current.

[0154] 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.

[0155] In this way, by setting the inductor current sampling gain of each switching power supply, the ratio of the load current output by each switching power supply can be set, thereby ensuring the convenience of load distribution for each switching power supply.

[0156] Embodiment 10, Fig. 9 The structure block diagram of the load distribution device 800 of the switching power supply provided by the embodiment of the present invention is shown. The load distribution device 800 of the switching power supply includes:

[0157] A memory 802, where programs or instructions are stored;

[0158] Processor 804, when executing the above program or instruction, implements the steps of the load distribution method of the switching power supply in any of the above embodiments.

[0159] The load distribution device 800 of the switching power supply provided in this embodiment includes a memory 802 and a processor 804. When the program or instructions in the memory 802 are executed by the processor 804, the steps of the load distribution method of the switching power supply in any of the above embodiments are implemented. Therefore, the load distribution device 800 of the switching power supply has all the beneficial effects of the load distribution method of the switching power supply in any of the above embodiments, which will not be repeated here.

[0160] Specifically, the memory 802 and the processor 804 may be connected via 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 (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other chips.

[0161] Embodiment eleven, Fig.10 The structure block diagram of a load distribution control system 900 of a switching power supply provided in an embodiment of the present invention is shown, wherein the load distribution control system 900 of a switching power supply comprises: the load distribution device 800 of the switching power supply in the above embodiment.

[0162] The load distribution control system 900 of the switching power supply provided in the embodiment of the present invention includes the load distribution device 800 of the switching power supply in the above embodiment. Therefore, the load distribution control system 900 of the switching power supply has all the beneficial effects of the load distribution device 800 of the switching power supply in the above embodiment, which will not be repeated here.

[0163] Embodiment 12, an embodiment of the sixth aspect of the present invention, provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the load distribution method of the switching power supply in any of the above embodiments are implemented.

[0164] The readable storage medium provided by the embodiment of the present invention can implement the steps of the load distribution method of the switching power supply in any of the above embodiments when the program or instruction stored therein is executed by the processor. Therefore, the readable storage medium has all the beneficial effects of the load distribution method of the switching power supply in any of the above embodiments, which will not be described in detail here.

[0165] Specifically, the above-mentioned readable storage medium may include any medium capable of storing or transmitting information. Examples of readable storage media include electronic circuits, semiconductor memory devices, read-only memory (ROM), random access memory (RAM), compact disc read-only memory (CD-ROM), flash memory, erasable ROM (EROM), magnetic tape, floppy disk, optical disk, hard disk, optical fiber medium, radio frequency (RF) link, optical data storage device, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0166] Embodiment 12, Fig.11 A structural block diagram of an air-conditioning device 1000 provided in an embodiment of the present invention is shown, wherein the air-conditioning device 1000 includes: a load distribution control system 100 of a switching power supply in any embodiment of the first aspect described above.

[0167] The air conditioning equipment 1000 provided in the embodiment of the present invention includes the load distribution control system 100 of the switching power supply in any embodiment of the first aspect mentioned above. Therefore, the air conditioning equipment 1000 has all the beneficial effects of the load distribution control system 100 of the switching power supply in any embodiment of the first aspect mentioned above, which will not be repeated here.

[0168] Embodiment thirteen, Fig.12 A structural block diagram of an air-conditioning device 1100 provided in an embodiment of the present invention is shown, wherein the air-conditioning device 1100 includes: a load distribution control system 900 of a switching power supply in the embodiment of the fifth aspect described above.

[0169] The air conditioning equipment 1100 provided in the embodiment of the present invention includes the load distribution control system 900 of the switching power supply in the above-mentioned fifth aspect embodiment. Therefore, the air conditioning equipment 1100 has all the beneficial effects of the load distribution control system 900 of the switching power supply in the above-mentioned fifth aspect embodiment, which will not be repeated here.

[0170] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance unless otherwise clearly specified and limited; the terms "connection", "installation", "fixation" and the like should be understood in a broad sense, for example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0171] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0172] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0173] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A load distribution control system for a switching power supply, characterized in that: include: at least one switching power supply; 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. Each of the switching power supplies outputs a target load current according to the load distribution control signal; 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. 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; 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; 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. The load distribution control system of the switching power supply according to claim 1, characterized in that: The load sharing control signal is related to the sum of the current load currents of each of the switching power supplies.

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 the switching power supplies is related to the inductor current sampling gain of the switching power supplies.

4. A load distribution method for a switching power supply, characterized in that: The load distribution method comprises: Get the current load current of each switching power supply; Determining a load distribution control signal according to the current load current; Determining a target load current of the switching power supply according to the load distribution control signal; Determining the target load current of each of the switching power supplies according to the load distribution control signal comprises: Acquire a primary inductor current sampling signal of each of the switching power supplies; 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, The inductor current sampling signal is the product of the primary inductor current of the switching power supply and the inductor current sampling gain; Wherein, the switching power supply has different inductor current sampling gains; 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. The load distribution method of the switching power supply according to claim 4, characterized in that: The step of determining a load distribution control signal according to the current load current comprises: The load distribution control signal is determined according to the sum of the current load currents of each of the switching power supplies.

6. The load distribution method of the switching power supply according to claim 4, characterized in that: 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. A load distribution device for a switching power supply, characterized in that: The load distribution device comprises: An acquisition unit, used for acquiring the 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; The processing unit is further used to determine the target load current of the switching power supply according to the load distribution control signal; The acquisition unit is further used to: acquire an inductor current sampling signal of the primary inductor of each of the switching power supplies; 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; 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; 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. A load distribution device for a switching power supply, characterized in that: include: Memory, storing programs or instructions; 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. A load distribution control system for a switching power supply, characterized in that: include: The load distribution device of the switching power supply as claimed in claim 8.

10. A readable storage medium having a program or instruction stored thereon, characterized in that: 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. An air conditioning device, characterized in that: include: A load distribution control system for a switching power supply according to any one of claims 1 to 3; or The load distribution control system of the switching power supply as claimed in claim 9.

Images