Single-phase power supply circuit in three-phase power supply and control method thereof

Abstract

This application relates to a single-phase power extraction circuit and its control method in a three-phase power supply. The single-phase power extraction circuit in the three-phase power supply includes a first power extraction interface, a second power extraction interface, a third power extraction interface, and a processor. One end of the first power extraction interface is connected to phase A of the three-phase power supply, and the other end of the first power extraction interface is connected to a first neutral point of the three-phase power supply. One end of the second power extraction interface is connected to phase B of the three-phase power supply, and the other end of the second power extraction interface is connected to a second neutral point of the three-phase power supply. One end of the third power extraction interface is connected to phase C of the three-phase power supply, and the other end of the third power extraction interface is connected to a third neutral point of the three-phase power supply. The processor can select the power extraction interface connected to the load according to the load power. The entire power extraction circuit can achieve single-phase power extraction without adding external circuits such as a neutral wire.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology, and in particular to a single-phase power supply circuit and its control method in a three-phase power supply. Background Technology

[0002] Three-phase alternating current (AC) is a form of electrical energy transmission, often simply called three-phase power. A three-phase AC power supply consists of three alternating current potentials with the same frequency, equal amplitude, and phases differing by 120° from each other. Three-phase AC power has many applications; most AC electrical equipment in industry, such as electric motors, uses three-phase AC power.

[0003] When a traditional three-phase power circuit supplies power to a load, a neutral wire is generally required. For example, when a three-phase circuit supplies power to an air conditioner, the outdoor unit of the air conditioner with a three-phase 380V power supply needs to have a neutral wire introduced on the power intake side, and then a live wire is taken to generate 220V power to supply the main control board, valve body and coil. However, in areas where the three-phase power supply does not have a neutral wire, a 380V to 220V power transformer is needed to achieve normal power supply and control, or the same effect can be achieved by connecting a power electronic device for voltage regulation.

[0004] It is evident that the traditional three-phase power supply process is complex, requiring the addition of transformers or a large number of external components such as power electronic devices to achieve three-phase power supply. Summary of the Invention

[0005] Therefore, it is necessary to address the complex technical issues of traditional three-phase power supply processes by providing a simplified single-phase power supply circuit, control method, system, computer equipment, storage medium, and computer program product for three-phase power supplies.

[0006] In a first aspect, this application provides a single-phase power supply circuit in a three-phase power supply, including a first power supply interface, a second power supply interface, a third power supply interface, and a processor;

[0007] One end of the first power input interface is connected to phase A of the three-phase power supply, and the other end of the first power input interface is connected to the first neutral point of the three-phase power supply. One end of the second power input interface is connected to phase B of the three-phase power supply, and the other end of the second power input interface is connected to the second neutral point of the three-phase power supply. One end of the third power input interface is connected to phase C of the three-phase power supply, and the other end of the third power input interface is connected to the third neutral point of the three-phase power supply.

[0008] The processor obtains the load power and selects the power input interface that is connected to the load based on the load power.

[0009] In one embodiment, the single-phase power supply circuit in the three-phase power supply further includes a first control switch, a second control switch, and a third control switch; the first power supply interface is connected to an external first load interface through the first control switch, the second power supply interface is connected to an external second load interface through the second control switch, and the third power supply interface is connected to an external third load interface through the third control switch; the control terminals of the first control switch, the second control switch, and the third control switch are respectively connected to the processor.

[0010] In one embodiment, the processor is further configured to monitor the voltage of the two connected power input interfaces when the two power input interfaces are connected to supply power to the load, and control the voltage of the two connected power input interfaces to be stable and to share a three-phase line voltage equally.

[0011] In one embodiment, the processor is further configured to determine the power supply interface connected to the load based on the load power, a preset first load power threshold, and a preset second load power threshold.

[0012] In one embodiment, the processor is further configured to: when the load power is less than a preset first load power threshold, turn on any one of the first power supply interface, the second power supply interface, and the third power supply interface; when the load power is not less than the preset first load power threshold and not greater than a preset second load power threshold, turn on the first power supply interface and the third power supply interface; and when the load power is greater than the preset second load power threshold, turn on the first power supply interface, the second power supply interface, and the third power supply interface simultaneously.

[0013] In one embodiment, the processor is further configured to, when the load power is less than a preset first load power threshold, turn on the first power input interface and the third power input interface connected to the target neutral point, wherein the target neutral point is the neutral point corresponding to the final stage capacitor in the three-phase power supply.

[0014] In one embodiment, the preset first power threshold ranges from 120 to 200W, and the preset second power threshold ranges from 360 to 440W.

[0015] In one embodiment, the processor is further configured to perform power synchronization control on the first power input interface, the second power input interface, and the third power input interface when the first power input interface, the second power input interface, and the third power input interface are simultaneously turned on according to the load power.

[0016] The single-phase power supply circuit in the above three-phase power supply includes a first power supply interface, a second power supply interface, a third power supply interface, and a processor. One end of the first power supply interface is connected to phase A of the three-phase power supply, and the other end of the first power supply interface is connected to the first neutral point of the three-phase power supply. One end of the second power supply interface is connected to phase B of the three-phase power supply, and the other end of the second power supply interface is connected to the second neutral point of the three-phase power supply. One end of the third power supply interface is connected to phase C of the three-phase power supply, and the other end of the third power supply interface is connected to the third neutral point of the three-phase power supply. The processor can select the power supply interface that is connected to the load according to the load power. The entire power supply circuit can achieve single-phase power supply without adding external circuits such as a neutral wire.

[0017] Secondly, this application also provides a single-phase power extraction control method in a three-phase power supply. This method is applied to the aforementioned single-phase power extraction circuit in a three-phase power supply; the single-phase power extraction control method in a three-phase power supply includes:

[0018] The load power, a preset first load power threshold, and a preset second load power threshold are obtained, wherein the preset first load power threshold is less than the preset second load power threshold.

[0019] The power input interface connected to the load is determined based on the load power, the preset first load power threshold, and the preset second load power threshold.

[0020] In one embodiment, the power extraction interface connected to the load is determined based on the load power, a preset first load power threshold, and a preset second load power threshold, including:

[0021] When the load power is less than the preset first load power threshold, select any one of the first power supply interface, the second power supply interface, and the third power supply interface to connect to the load.

[0022] When the load power is not less than the preset first load power threshold and not greater than the preset second load power threshold, the first power input interface and the third power input interface are selected to be connected to the load.

[0023] When the load power exceeds the preset second load power threshold, the first power input interface, the second power input interface, and the third power input interface are simultaneously connected to the load.

[0024] Thirdly, this application also provides a single-phase power supply control system for a three-phase power supply, which is applied to the aforementioned single-phase power supply circuit in a three-phase power supply; the single-phase power supply control system for a three-phase power supply includes:

[0025] The data acquisition module is used to acquire the load power, a preset first load power threshold, and a preset second load power threshold, wherein the preset first load power threshold is less than the preset second load power threshold.

[0026] The interface determination module is used to determine the power supply interface that is connected to the load based on the load power, a preset first load power threshold, and a preset second load power threshold.

[0027] Fourthly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to perform the following steps:

[0028] The load power, a preset first load power threshold, and a preset second load power threshold are obtained, wherein the preset first load power threshold is less than the preset second load power threshold.

[0029] The power input interface connected to the load is determined based on the load power, the preset first load power threshold, and the preset second load power threshold.

[0030] Fifthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, performs the following steps:

[0031] The load power, a preset first load power threshold, and a preset second load power threshold are obtained, wherein the preset first load power threshold is less than the preset second load power threshold.

[0032] The power input interface connected to the load is determined based on the load power, the preset first load power threshold, and the preset second load power threshold.

[0033] Sixthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, performs the following steps:

[0034] The load power, a preset first load power threshold, and a preset second load power threshold are obtained, wherein the preset first load power threshold is less than the preset second load power threshold.

[0035] The power input interface connected to the load is determined based on the load power, the preset first load power threshold, and the preset second load power threshold.

[0036] The above-mentioned control method, system, computer equipment, storage medium and computer program product for single-phase power supply circuit in three-phase power supply are applied to the above-mentioned single-phase power supply circuit in three-phase power supply. The entire control scheme determines the power supply interface connected to the load based on the load power, the preset first load power threshold and the preset second load power threshold. It can realize single-phase power supply of three-phase power without adding a neutral wire. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the topology of a three-phase power supply.

[0038] Figure 2 This is a schematic diagram of the topology of a single-phase power supply circuit in a three-phase power supply in one embodiment;

[0039] Figure 3 The VI characteristic curve of the power extraction interface when connected to a single-phase, single-load condition;

[0040] Figure 4 The VI characteristic curve of the interface when two single-phase loads are connected and phase C is fixed at 600Ω;

[0041] Figure 5 The VI characteristic curve of the interface when two single-phase loads are connected and phase C is fixed at 300Ω;

[0042] Figure 6 This is a schematic diagram of the topology of a single-phase power supply circuit in a three-phase power supply in another embodiment;

[0043] Figure 7 This is a schematic diagram of the topology of a single-phase power supply circuit in a three-phase power supply in another embodiment;

[0044] Figure 8 This is a flowchart illustrating a single-phase power supply circuit control method in a three-phase power supply according to one embodiment.

[0045] Figure 9 This is a block diagram of the control system of a single-phase power supply circuit in a three-phase power supply in one embodiment;

[0046] Figure 10 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0048] To explain in detail the technical solution, principle, and effect of the single-phase power supply circuit in the three-phase power supply of this application, the circuit structure of a conventional three-phase power supply will be described first.

[0049] The circuit structure of a conventional three-phase power supply is as follows: Figure 1As shown, AC_L1, AC_L2, and AC_L3 represent the A, B, and C phases of the three-phase power supply, respectively. L1(a, b, c), L2(a, b, c), and L3(a, b, c) are three-stage chokes. CX1, CX2, CX3, CX4, CX5, CX6, CX7, CX8, and CX9 are X capacitors. There are three stages of X capacitors: CX1 to CX3 are the first stage capacitors; CX4 to CX6 are the second stage capacitors; and CX7 to CX9 are the third stage capacitors. In practice, there are also Y capacitors, which are shown for clarity. Figure 1 Not shown in the diagram, the circuit also includes rectifier sections and other structures at its end. Furthermore, the three-phase power supply in this application refers to a three-phase power supply without a neutral wire.

[0050] like Figure 2 As shown, this application provides a single-phase power supply circuit in a three-phase power supply, including a first power supply interface 100, a second power supply interface 200, a third power supply interface 300, and a processor 400.

[0051] One end of the first power input interface 100 is connected to phase A of the three-phase power supply, and the other end of the first power input interface 100 is connected to the first neutral point of the three-phase power supply. One end of the second power input interface 200 is connected to phase B of the three-phase power supply, and the other end of the second power input interface 200 is connected to the second neutral point of the three-phase power supply. One end of the third power input interface 300 is connected to phase C of the three-phase power supply, and the other end of the third power input interface 300 is connected to the third neutral point of the three-phase power supply.

[0052] The processor 400 obtains the load power and selects the power input interface that is connected to the load based on the load power.

[0053] The neutral point refers to the neutral point of different stages of X capacitors in a three-phase power supply, specifically in... Figure 2 In this system, the neutral points include neutral point N1, neutral point N2, and neutral point N3. Neutral points N1, N2, and N3 form the inner neutral line. The first neutral point, the second neutral point, and the third neutral point are different neutral points selected from neutral points N1, N2, and N3. In the entire three-phase power supply, the single-phase power supply circuit can draw power from different phases of the three-phase power supply and form a loop with different neutral points. Different power supply interfaces are set on different loops, which constitute the first power supply interface 100, the second power supply interface 200, and the third power supply interface 300.

[0054] For ease of explanation, the following will be based on... Figure 2 Taking the circuit structure shown as an example, one end of the first power input interface 100 is connected to phase A of the three-phase power supply, and the other end of the first power input interface 100 is connected to the first neutral point ( Figure 2(Diagram showing neutral point N1) is connected, one end of the second power input interface 200 is connected to phase B of the three-phase power supply, and the other end of the second power input interface 200 is connected to the second neutral point (Diagram showing neutral point N1). Figure 2 The first power input interface 100, the second power input interface 200, and the third power input interface 300 are connected. One end of the third power input interface 300 is connected to phase C of the three-phase power supply, and the other end is connected to the third neutral point (shown as neutral point N3 in the diagram). The processor 400 is connected to the first power input interface 100, the second power input interface 200, and the third power input interface 300 respectively, controlling their connection to the load. Specifically, the processor 400 selects the power input interface to be connected to the load based on the load power required, that is, determines which power input interface(s) the load draws power from. Figure 2 The structure clearly shows that the entire power supply circuit can achieve single-phase power supply without adding a neutral wire to the power supply tester.

[0055] The single-phase power supply circuit in the above-mentioned three-phase power supply includes a first power supply interface 100, a second power supply interface 200, a third power supply interface 300, and a processor 400. One end of the first power supply interface 100 is connected to phase A of the three-phase power supply, and the other end of the first power supply interface 100 is connected to the first neutral point of the three-phase power supply. One end of the second power supply interface 200 is connected to phase B of the three-phase power supply, and the other end of the second power supply interface 200 is connected to the second neutral point of the three-phase power supply. One end of the third power supply interface 300 is connected to phase C of the three-phase power supply, and the other end of the third power supply interface 300 is connected to the third neutral point of the three-phase power supply. The processor 400 can select the power supply interface that is connected to the load according to the load power. The entire power supply circuit can achieve single-phase power supply without adding external circuits such as a neutral wire.

[0056] Furthermore, the processor can also control the power extraction interface connected to the load based on the electrical characteristics of the power extraction interface and the load power. Taking the filtered A-phase live wire and neutral point N3 as an example, forming the first power extraction interface 100 (single-phase power extraction interface 1), and the filtered C-phase live wire and neutral point N2 as an example, based on... Figure 1 As can be seen from the topology of the three-phase power supply, the first power input interface is a high-power interface, and the second power input interface is an extended low-power interface. The difference in the power that the two interfaces can carry is determined by the variation characteristics of the voltage at their interface terminals. This will be further described through simulation below.

[0057] Initially, when only a single-phase load is connected, as the load increases, the current increases, and the power interface voltage decreases, specifically as follows: Figure 3As shown. Based on the above principle, the processor needs to control the load power to prevent excessive load from causing the voltage to drop to a point where the main control load cannot function properly when multiple loads are connected to a single power input interface. Next, we examine the system with two single-phase loads connected simultaneously. We fix the load resistance of the low-power interface (phase C) and adjust the load of the high-power interface (phase A), then examine the IV characteristic curves of the two interfaces, as shown in the figures below. Figure 4 as well as Figure 5 As shown, the current change in phase C is much smaller than that in phase A. Note that the voltage in phase A is significantly higher than that in phase C over a wide load range, meaning that the power that the phase A interface can handle is significantly higher than that in phase C. There is a certain voltage constraint between the two interfaces; as the load on phase A increases, the voltage in phase C first decreases and then increases. This situation also requires careful control of the interface voltage to ensure normal load operation. Meanwhile, compared... Figure 4 as well as Figure 5 As shown in the two diagrams, increasing the load on phase C reduces the phase C voltage, but increases the phase A interface voltage, thus increasing its load-carrying capacity. The two interface voltages are 180° out of phase.

[0058] Furthermore, when two single-phase power input interfaces are simultaneously connected and output power, examining the ripple current of the X capacitor reveals that the load current flows through each phase's X capacitor in turn, resulting in a balanced power supply. Data comparing the connection and disconnection of single-phase loads are shown in Tables 1 and 2 below.

[0059] Table 1 Single-phase load resistance 300Ω

[0060]

[0061] Table 2 Single-phase load resistance 300000Ω

[0062]

[0063] Based on the data in Tables 1 and 2 above, it can be seen that the larger the single-phase load current, the smaller the ripple current of capacitor X. That is to say, the ripple current of capacitor X is transferred to the single-phase load and reused. The ripple loss of the capacitor itself is also reduced. Moreover, each capacitor shares this part of the single-phase output power equally, which avoids the problem of increased three-phase power supply current imbalance caused by using a transformer scheme.

[0064] In one embodiment, the single-phase power supply circuit in the three-phase power supply further includes a first control switch, a second control switch, and a third control switch; the first power supply interface is connected to an external first load interface through the first control switch, the second power supply interface is connected to an external second load interface through the second control switch, and the third power supply interface is connected to an external third load interface through the third control switch; the control terminals of the first control switch, the second control switch, and the third control switch are respectively connected to the processor.

[0065] In this embodiment, the single-phase power supply circuit in the entire three-phase power supply also includes a first control switch, a second control switch, and a third control switch. The processor controls the power supply interface connected to the load by controlling the first control switch, the second control switch, and the third control switch to achieve convenient power supply. Specifically, the first control switch, the second control switch, and the third control switch can be electronic switches or relays, etc.

[0066] In one embodiment, the processor is further configured to monitor the voltage of the two connected power input interfaces when the two power input interfaces are connected to supply power to the load, and control the voltage of the two connected power input interfaces to be stable and to share a three-phase line voltage equally.

[0067] As described above, the processor can determine whether to use a single power connector, two power connectors, or three power connectors to power the load based on the load power. When using two power connectors, the processor further monitors the voltage of the two active power connectors, controlling their voltage to be stable and evenly share the three-phase line voltage. Specifically, when using two connectors to power the load, the processor controls the voltage of the two active power connectors to be stable at 190V, precisely sharing the line voltage.

[0068] In one embodiment, the processor is further configured to determine the power supply interface connected to the load based on the load power, a preset first load power threshold, and a preset second load power threshold.

[0069] The preset first load power threshold and preset second load power threshold are pre-set power thresholds, specifically related to the structure of the three-phase power supply, and specifically related to the size of the X capacitor and the properties of the choke coil. In practical applications, the three-phase power supply can be simulated to obtain its load capacity range, and then the preset first load power threshold and preset second load power threshold can be determined based on this range. Furthermore, the preset first load power and preset second load power threshold divide the entire three-phase power supply output power range into low-power output, medium-power output, and high-power output, corresponding to low-power load, medium-power load, and high-power load application scenarios, respectively. More specifically, the preset first load power threshold ranges from 120 to 200W, and the preset second load power threshold ranges from 360 to 440W. Preferably, the first load power threshold is 160W, and the second load power threshold is 400W.

[0070] In one embodiment, the processor is further configured to: when the load power is less than a preset first load power threshold, turn on any one of the first power supply interface, the second power supply interface, and the third power supply interface; when the load power is not less than the preset first load power threshold and not greater than a preset second load power threshold, turn on the first power supply interface and the third power supply interface; and when the load power is greater than the preset second load power threshold, turn on the first power supply interface, the second power supply interface, and the third power supply interface simultaneously.

[0071] When the load power is less than the preset first load power threshold, it indicates a low-power load, and power is supplied to the load using any one of the first, second, or third power input interfaces. When the load power is not less than the preset first power threshold and not greater than the preset second load power threshold, it indicates a medium-power load (or a relatively high-power load). In this case, power supply using a single power input interface is insufficient, so two power input interfaces are used. The first and third power input interfaces (phase A and phase C) are activated to supply power to the load. Furthermore, the processor monitors the voltage of the two power input interfaces and stabilizes the voltage based on the monitoring results to ensure that the two power input interfaces share the same line voltage evenly, maximizing the total output power and efficiency. When the load power exceeds the preset second load power threshold, it indicates a very high load power, requiring simultaneous activation of the first, second, and third power input interfaces to supply power.

[0072] In one embodiment, the processor is further configured to, when the load power is less than a preset first load power threshold, turn on the first power input interface and the third power input interface connected to the target neutral point, wherein the target neutral point is the neutral point corresponding to the final stage capacitor in the three-phase power supply.

[0073] The target neutral point refers to the neutral point corresponding to the last capacitor in a three-phase power supply; the last capacitor is the final capacitor in a three-phase power supply. Figure 2 For example, the final stage capacitor is the third-stage X capacitor, and the target neutral point is neutral point N3. When the required single-phase load power in the power system is small (<160W), only a single power input interface is needed. In this case, any one phase live wire and neutral point N3 directly form the power input interface. Point N3 is chosen to ensure that the load current passes through the neutral coil of the second and third-stage chokes, forming a common-mode relationship to suppress high-frequency interference. In this situation, no voltage detection circuit is needed; it is sufficient to ensure that the maximum power required by the load during operation does not exceed the critical value.

[0074] In one embodiment, the processor is further configured to perform power synchronization control on the first power input interface, the second power input interface, and the third power input interface when the first power input interface, the second power input interface, and the third power input interface are simultaneously turned on according to the load power.

[0075] When the load power exceeds the preset second power threshold, it indicates that the load power is very high and three interfaces need to be used simultaneously for power supply. The specific structure diagram is as follows: Figure 6 As shown. The special feature of the three-port topology is that as long as the magnitudes of the three single-phase loads (RL1, RL2, RL3) are kept consistent or change synchronously, the voltage of the three single-phase ports can be guaranteed to remain stable at 220V. This is a significant advantage compared to two-port and single-port topologies. In this case, a voltage detection circuit is not required, and a method similar to that of the two-port topology can be used: adjusting the voltage of the three ports by controlling the single-phase power input of each load group. Alternatively, three single-phase rectifier bridges can be used, and the rectified current can be combined across the three buses to power large-scale loads such as motors and electric heaters. This also naturally achieves power balance (synchronization) and automatic voltage stabilization of the three ports. Simulation results show that the total single-phase power output of the three-port topology can reach over 2000W.

[0076] To illustrate in detail the technical solution and effects of the single-phase power supply control circuit in the three-phase power supply of this application, specific examples will be used below, along with... Figure 6 as well as Figure 7 To elaborate further, in a specific example, the neutral points include N1, N2, and N3; the preset first power threshold is 160W; and the preset second power threshold is 400W.

[0077] When the single-phase load power required in the power system is small (<160W), only a single power input interface is needed. In this case, any one phase live wire and neutral point N3 form the power input interface. Point N3 is chosen to ensure that the load current passes through the neutral coil of the second and third stage chokes, forming a common-mode relationship to suppress high-frequency interference. In this situation, no voltage detection circuit is needed; simply ensure that the maximum power required by the load during operation does not exceed the critical value. When the single-phase load power required in the power system is large, two power input interfaces are needed, and voltage monitoring is performed on both interfaces. In circuit design, various types of loads are classified, and the power supply for each type of load is combined into one, forming multiple load groups, such as... Figure 7 As shown, two switching devices or relays are used to bring out two power input interfaces for each load group. These interfaces are connected to phase A and phase C respectively. The actual power absorbed by each load branch is adjusted and distributed in real time by the processor based on the voltage detected by the two power input interfaces. The principle of power distribution is: when the voltage at both ports is stable at 190V, the line voltage is evenly distributed. At this point, the total output power of the two power input interfaces remains at its maximum, efficiency is highest, and the voltage range requirement of ±15% for typical single-phase loads is also met. For Figure 7 The circuit topology shown, with a 2.2uF capacitor for the second stage and a 5uF capacitor for the third stage, achieves a total single-phase output power of 400W using the load control method described above. For this design, when the load is below a critical value, it can directly switch to single-interface operation mode. When the power required by the single-phase load exceeds 400W, all three interfaces need to be used simultaneously for power supply, with the specific topology as follows: Figure 6 As shown, the unique feature of the three-port topology is that as long as the three single-phase loads (RL1, RL2, RL3) maintain the same magnitude or change synchronously, the voltage at all three single-phase ports can be guaranteed to remain stable at 220V. This is a significant advantage compared to two-port and single-port topologies. In this case, a voltage detection circuit is unnecessary; a method similar to that of the two-port topology can be used: adjusting the voltage at the three ports by controlling the single-phase power input of each load group. Alternatively, three single-phase rectifier bridges can be used, and the rectified current can be combined across the three buses to power large-scale loads such as motors and electric heaters. This naturally achieves power balance and automatic voltage stabilization at the three ports. Simulation results show that in this application example, the total single-phase power output of the three-port topology can reach over 2000W.

[0078] In addition, this application also provides a single-phase power supply control method in a three-phase power supply. This method is applied to the single-phase power supply circuit in the aforementioned three-phase power supply; such as... Figure 8 As shown, the single-phase power supply control methods in a three-phase power supply include:

[0079] S200: Obtain the load power, a preset first load power threshold, and a preset second load power threshold, wherein the preset first load power threshold is less than the preset second load power threshold;

[0080] S400: Determine the power supply interface that is connected to the load based on the load power, the preset first load power threshold, and the preset second load power threshold.

[0081] In one embodiment, the power extraction interface connected to the load is determined based on the load power, a preset first load power threshold, and a preset second load power threshold, including:

[0082] When the load power is less than the preset first load power threshold, select any one of the first power supply interface, the second power supply interface, and the third power supply interface to connect to the load.

[0083] When the load power is not less than the preset first load power threshold and not greater than the preset second load power threshold, the first power input interface and the third power input interface are selected to be connected to the load.

[0084] When the load power exceeds the preset second load power threshold, the first power input interface, the second power input interface, and the third power input interface are simultaneously connected to the load.

[0085] In addition, this application also provides a single-phase power supply control system for a three-phase power supply, which is applied to the single-phase power supply circuit of the aforementioned three-phase power supply; such as Figure 9 As shown, the single-phase power supply control system in a three-phase power supply includes:

[0086] The data acquisition module 920 is used to acquire the load power, a preset first load power threshold, and a preset second load power threshold, wherein the preset first load power threshold is less than the preset second load power threshold.

[0087] The interface determination module 940 is used to determine the power supply interface that is connected to the load based on the load power, a preset first load power threshold and a preset second load power threshold.

[0088] It should be understood that although the steps in the flowcharts of the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the above embodiments may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0089] In the aforementioned three-phase power supply single-phase power control system, each module can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device, or stored in the computer device's memory as software, so that the processor can call and execute the corresponding operations of each module.

[0090] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 10 As shown, the computer device includes a processor, memory, communication interface, display screen, and input device connected via a system bus. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a single-phase power supply control method in a three-phase power supply.

[0091] Those skilled in the art will understand that Figure 10 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0092] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0093] The load power, a preset first load power threshold, and a preset second load power threshold are obtained, wherein the preset first load power threshold is less than the preset second load power threshold.

[0094] The power input interface connected to the load is determined based on the load power, the preset first load power threshold, and the preset second load power threshold.

[0095] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0096] The load power, a preset first load power threshold, and a preset second load power threshold are obtained, wherein the preset first load power threshold is less than the preset second load power threshold.

[0097] The power input interface connected to the load is determined based on the load power, the preset first load power threshold, and the preset second load power threshold.

[0098] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0099] The load power, a preset first load power threshold, and a preset second load power threshold are obtained, wherein the preset first load power threshold is less than the preset second load power threshold.

[0100] The power input interface connected to the load is determined based on the load power, the preset first load power threshold, and the preset second load power threshold.

[0101] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0102] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A single-phase power extraction circuit in a three-phase power supply, characterized in that, It includes a first power input interface, a second power input interface, a third power input interface, and a processor; One end of the first power input interface is connected to phase A of the three-phase power supply, and the other end of the first power input interface is connected to the first neutral point of the three-phase power supply. One end of the second power input interface is connected to phase B of the three-phase power supply, and the other end of the second power input interface is connected to the second neutral point of the three-phase power supply. One end of the third power input interface is connected to phase C of the three-phase power supply, and the other end of the third power input interface is connected to the third neutral point of the three-phase power supply. The processor obtains the load power and selects the power input interface that is connected to the load based on the load power.

2. The single-phase power supply circuit in a three-phase power supply according to claim 1, characterized in that, It also includes a first control switch, a second control switch, and a third control switch; The first power input interface is connected to an external first load interface via a first control switch, the second power input interface is connected to an external second load interface via a second control switch, and the third power input interface is connected to an external third load interface via a third control switch; The control terminals of the first control switch, the second control switch, and the third control switch are respectively connected to the processor.

3. The single-phase power supply circuit in a three-phase power supply according to claim 1, characterized in that, The processor is also used to monitor the voltage of the two connected power input interfaces when the two power input interfaces are connected to supply power to the load, and control the voltage of the two connected power input interfaces to be stable and to share a three-phase line voltage equally.

4. The single-phase power supply circuit in a three-phase power supply according to claim 1, characterized in that, The processor is also used to determine the power supply interface connected to the load based on the load power, a preset first load power threshold, and a preset second load power threshold.

5. The single-phase power supply circuit in a three-phase power supply according to claim 1, characterized in that, The processor is further configured to: when the load power is less than a preset first load power threshold, activate any one of the first power input interface, the second power input interface, and the third power input interface; when the load power is not less than the preset first load power threshold and not greater than a preset second load power threshold, activate the first power input interface and the third power input interface; and when the load power is greater than the preset second load power threshold, activate the first power input interface, the second power input interface, and the third power input interface simultaneously.

6. The single-phase power supply circuit in a three-phase power supply according to claim 1, characterized in that, The processor is further configured to, when the load power is less than a preset first load power threshold, turn on the first power input interface and the third power input interface connected to the target neutral point, wherein the target neutral point is the neutral point corresponding to the final stage capacitor in the three-phase power supply.

7. The single-phase power supply circuit in a three-phase power supply according to claim 4 or 5, characterized in that, The preset first power threshold ranges from 120 to 200W, and the preset second power threshold ranges from 360 to 440W.

8. The single-phase power supply circuit in a three-phase power supply according to claim 1, characterized in that, The processor is further configured to perform power synchronization control on the first power input interface, the second power input interface, and the third power input interface when the first power input interface, the second power input interface, and the third power input interface are simultaneously turned on according to the load power.

9. A method for controlling single-phase power supply in a three-phase power source, characterized in that, Applied to a single-phase power supply circuit in a three-phase power supply as described in any one of claims 1-8; The single-phase power supply control method in the three-phase power supply includes: The load power, a preset first load power threshold, and a preset second load power threshold are obtained, wherein the preset first load power threshold is less than the preset second load power threshold; The power supply interface connected to the load is determined based on the load power, the preset first load power threshold, and the preset second load power threshold.

10. The single-phase power supply control method in a three-phase power supply according to claim 9, characterized in that, The step of determining the power input interface connected to the load based on the load power, the preset first load power threshold, and the preset second load power threshold includes: When the load power is less than the preset first load power threshold, any one of the first power supply interface, the second power supply interface, and the third power supply interface is selected to be connected to the load; When the load power is not less than the preset first load power threshold and not greater than the preset second load power threshold, the first power input interface and the third power input interface are selected to be connected to the load; When the load power is greater than the preset second load power threshold, the first power input interface, the second power input interface, and the third power input interface are simultaneously connected to the load.

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