Low voltage power supply circuit of bidirectional inverter and control method and storage medium thereof

Abstract

The present invention discloses a low-voltage power supply circuit of a bidirectional inverter and a control method and a storage medium thereof. Two independent ground-side power supply units are respectively used on both sides of an isolation ground and a separate transformer is used as an ideal transformer. The two independent ground-side power supply units can be well matched only through the primary winding, the secondary winding and a single switch driving element of the transformer, so that the two ground-side power supply units can effectively and reliably cooperate to provide low-voltage power supply. The cost is lower and the process is simple, and the PCB area of ​​the low-voltage power supply circuit can be saved. In addition, the voltage input conditions of the mains input terminal, the photovoltaic input terminal and the battery input terminal are monitored in real time to obtain the voltage input monitoring result, so as to control the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit accordingly, which not only meets the working requirements of the inverter multi-mode startup, but also provides a more convenient and effective low-voltage power supply control method, which is conducive to energy saving and consumption reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronic circuits, and in particular to a low-voltage power supply circuit of a bidirectional inverter and a control method thereof, an electronic device, and a computer-readable storage medium. Background Art

[0002] With the continuous development of energy storage business, small energy storage technology has gradually matured. As the main component of energy storage system, bidirectional inverter has been more and more widely used in recent years. Since the inverter needs to meet a variety of different working modes to start up, the corresponding low-voltage power supply system design is relatively complex, which has become a major problem to be solved. At present, the two-stage high-voltage flyback circuit designed on the market is used as a low-voltage power supply system to power the entire inverter. Although it can provide good power supply for the entire inverter to a certain extent, it requires multiple high-voltage switching devices, multi-channel transformer windings and complex peripheral circuits, which is costly and occupies a large PCB area, and the process is more complicated. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present invention provides a low-voltage power supply circuit of a bidirectional inverter and a control method thereof, an electronic device, and a computer-readable storage medium, which have lower cost and simple process, and save PCB area.

[0004] In a first aspect, an embodiment of the present invention provides a low-voltage power supply circuit for a bidirectional inverter, comprising:

[0005] A primary ground side power supply unit is arranged on one side of a preset first isolation ground, and the primary ground side power supply unit includes a mains input terminal, a bus capacitor, a first power management chip, a first power supply module, a first control chip, a switch drive element and a transformer, wherein the bus capacitor is respectively connected to the primary winding of the transformer, the first power management chip and the mains input terminal, the first power management chip is connected to the first control chip through the first power supply module, and the primary winding of the transformer is also connected to the first control chip through the switch drive element, wherein the bus capacitor is used to provide a starting voltage to the first power management chip after soft start, the first control chip is used to output a PWM signal to turn on or off the switch drive element, and the first power supply module is used to provide a working voltage to the first control chip;

[0006] A secondary ground side power supply unit is arranged on one side of a preset second isolation ground, and the secondary ground side power supply unit includes a photovoltaic input terminal, a battery input terminal, a secondary ground side rectifier module, a second power management chip, a second power supply module and a second control chip. The photovoltaic input terminal and the battery input terminal are both connected to the second power management chip, and the secondary ground side rectifier module is respectively connected to the secondary winding of the transformer and the second power management chip. The second power management chip is also connected to the second control chip through the second power supply module, wherein the secondary ground side rectifier module is used to provide a demagnetization circuit for the transformer, the second power supply module is used to provide an operating voltage to the second control chip, and the second control chip is used to control the wave generation of the secondary ground side power supply unit.

[0007] Optionally, the second power supply module includes a first power conversion element, a first energy storage inductor, a first freewheeling diode, a second freewheeling diode, a first filter capacitor, a second filter capacitor and a first energy storage capacitor. The output voltage pin of the second power management chip is connected to the second isolation ground through the first filter capacitor, the first freewheeling diode, the second freewheeling diode and the first energy storage capacitor connected in series, respectively. The first filter capacitor is connected to the cathode of the first freewheeling diode, the first energy storage capacitor is connected to the anode of the second freewheeling diode, the first energy storage inductor is arranged between the first connection point and the second connection point, and the first power conversion element is connected to the voltage output end of the second power management chip to convert the output voltage of the second power management chip into a target power supply voltage, and the target power supply voltage is used to provide a working voltage for the second control chip, wherein the first connection point is located between the first filter capacitor and the cathode of the first freewheeling diode, and the second connection point is located between the first energy storage capacitor and the anode of the second freewheeling diode.

[0008] Optionally, in one embodiment of the present invention, the primary ground side power supply unit also includes a primary ground side rectifier module for outputting rectified AC power voltage to the bus capacitor, and the primary ground side rectifier module is respectively connected to the AC power input terminal and the bus capacitor.

[0009] Optionally, in one embodiment of the present invention, the primary ground side power supply unit also includes a mains soft-start resistor for providing a mains voltage input, one end of the mains soft-start resistor is connected to the mains input terminal, and the other end is connected to the primary ground side rectifier module.

[0010] In a second aspect, an embodiment of the present invention provides a method for controlling a low-voltage power supply circuit of a bidirectional inverter as described in the first aspect, comprising:

[0011] Performing real-time monitoring on the voltage input conditions of the mains input terminal, the photovoltaic input terminal and the battery input terminal to obtain a voltage input monitoring result;

[0012] The working states of the primary ground-side power supply unit and the secondary ground-side power supply unit are controlled according to the voltage input monitoring result.

[0013] Optionally, in an embodiment of the present invention, controlling the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the voltage input monitoring result includes:

[0014] When the voltage input monitoring result indicates that there is voltage input at the photovoltaic input terminal and there is no voltage input at the mains input terminal and the battery input terminal, the secondary ground-side power supply unit is controlled by the second control chip not to generate waves;

[0015] or,

[0016] When the voltage input monitoring result indicates that there is voltage input at the battery input terminal and there is no voltage input at the mains input terminal and the photovoltaic input terminal, the second control chip is used to control the secondary ground-side power supply unit to generate waves.

[0017] Optionally, in an embodiment of the present invention, controlling the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the voltage input monitoring result includes:

[0018] When the voltage input monitoring result indicates that there is voltage input at the mains input terminal and there is no voltage input at the photovoltaic input terminal and the battery input terminal, the real-time operating status of the bidirectional inverter is obtained;

[0019] According to the real-time operating status of the bidirectional inverter, the operating status of the primary ground-side power supply unit and the secondary ground-side power supply unit are controlled.

[0020] Optionally, in one embodiment of the present invention, controlling the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the real-time operating state of the bidirectional inverter includes:

[0021] When the bidirectional inverter is in a grid-connected working state, the primary ground-side power supply unit is controlled to generate waves through the first control chip;

[0022] or,

[0023] When the bidirectional inverter is in a grid-connected standby state, the first control chip controls the primary ground-side power supply unit to not generate waves.

[0024] In a third aspect, an embodiment of the present invention provides an electronic device, including:

[0025] at least one processor;

[0026] at least one memory for storing at least one program;

[0027] When at least one of the programs is executed by at least one of the processors, the control method for the low-voltage power supply circuit of the bidirectional inverter as described in the second aspect is implemented.

[0028] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores a program executable by a processor, and when the program executable by the processor is executed by the processor, it is used to implement the control method of the low-voltage power supply circuit of the bidirectional inverter as described in the second aspect.

[0029] The low-voltage power supply circuit of the bidirectional inverter proposed in the present invention and its control method and storage medium respectively adopt two independent ground-side power supply units on both sides of the isolation ground, and use a separate transformer as an ideal transformer. The two independent ground-side power supply units can be well matched only through the primary winding, the secondary winding and a single switch driving element of the transformer, so that the two ground-side power supply units can effectively and reliably cooperate to provide low-voltage power supply. Compared with the relevant existing technology, the cost is lower and the process is simple, and the PCB area of ​​the low-voltage power supply circuit can be saved; and the voltage input conditions of the mains input terminal, the photovoltaic input terminal and the battery input terminal are monitored in real time to obtain the voltage input monitoring result, which can reflect the current working mode of the bidirectional inverter, so that the working status of the primary ground-side power supply unit and the secondary ground-side power supply unit can be controlled accordingly, which not only meets the working requirements of the multi-mode startup of the inverter, but also provides a more convenient and effective low-voltage power supply control method, which is conducive to energy saving and consumption reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a topological principle diagram of a secondary ground-side power supply unit provided in one embodiment of the present invention;

[0031] Figure 2 is a topological principle diagram of a primary ground-side power supply unit provided in one embodiment of the present invention;

[0032] Figure 3 is a flow chart of a method for controlling a low-voltage power supply circuit of a bidirectional inverter provided by an embodiment of the present invention;

[0033] Figure 4 yes Figure 3 A flow chart of step S2000 in FIG.

[0034] Figure 5 yes Figure 3 Another flow chart of step S2000 in FIG.

[0035] Figure 6 yes Figure 5 Flowchart of step S2300 in FIG.

[0036] Figure 7 It is a structural schematic diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] It should be noted that although the functional modules are divided in the device schematic and the logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart.

[0039] Figure 1 A topological schematic diagram of a secondary ground-side power supply unit provided in an embodiment of the present invention, Figure 2 A topological schematic diagram of a primary ground-side power supply unit provided in one embodiment of the present invention.

[0040] Reference Figure 1 and Figure 2 The low-voltage power supply circuit of the bidirectional inverter specifically includes but is not limited to:

[0041] A primary ground side power supply unit is arranged on one side of a preset first isolation ground GND1. The primary ground side power supply unit includes a mains input terminal AC, a bus capacitor C1, a first power management chip BUCK_GND1, a first power supply module 300, a first control chip MCU1, a switch driving element NM1 and a transformer T1. The bus capacitor C1 is respectively connected to the primary winding of the transformer T1, the first power management chip BUCK_GND1 and the mains input terminal AC. The first power management chip BUCK_GND1 is connected to the first control chip MCU1 through the first power supply module 300. The primary winding of the transformer T1 is also connected to the first control chip MCU1 through the switch driving element NM1. The bus capacitor C1 is used to provide a starting voltage to the first power management chip BUCK_GND1 after soft start. The first control chip MCU1 is used to output a PWM signal to turn on or off the switch driving element NM1. The first power supply module 300 is used to provide a working voltage to the first control chip MCU1.

[0042] The secondary ground side power supply unit is arranged on one side of the preset second isolation ground GND2. The secondary ground side power supply unit includes a photovoltaic input terminal PV, a battery input terminal BAT, a secondary ground side rectifier module 200, a second power management chip BUCK_GND2, a second power supply module 100 and a second control chip MCU2. The photovoltaic input terminal PV and the battery input terminal BAT are both connected to the second power management chip BUCK_GND2. The secondary ground side rectifier module 200 is respectively connected to the secondary winding of the transformer T1 and the second power management chip BUCK_GND2. The second power management chip BUCK_GND2 is also connected to the second control chip MCU2 through the second power supply module 100. The secondary ground side rectifier module 200 is used to provide a demagnetization circuit for the transformer T1, the second power supply module 100 is used to provide a working voltage to the second control chip MCU2, and the second control chip MCU2 is used to control the wave generation of the secondary ground side power supply unit.

[0043] It can be seen that two independent ground-side power supply units are respectively used on both sides of the isolation ground, and a separate transformer T1 is used as an ideal transformer. The two independent ground-side power supply units can be well matched only through the primary winding, the secondary winding and the single switch driving element NM1 of the transformer T1, so that the two ground-side power supply units can effectively and reliably cooperate to provide low-voltage power supply. Compared with the relevant prior art, the embodiment of the present invention greatly reduces the number and volume of devices. Only a single switch driving element NM1 is needed, which saves at least the layout cost of one high-voltage switch device, and also saves the two-stage flyback circuit and its complex peripheral circuits. Therefore, the cost is lower and the process is simple, and the PCB area of ​​the low-voltage power supply circuit can be saved. In particular, it can be but not limited to replacing two high-voltage flyback transformers with large transformation ratios with a simple low-voltage ideal transformer. The transformation ratio of the two windings of the transformer T1 can be set to 1:1, but it is not the only limitation. For example, the core ratio in low-voltage occasions can be selected to be set to a smaller value, or it can be set to the required value in the corresponding scenario.

[0044] It should be noted that the first power management chip BUCK_GND1 and the second power management chip BUCK_GND2 play a role in reducing voltage, and corresponding devices can be selected for setting according to different scenarios, for example, referring to Figure 1 and Figure 2The first power management chip BUCK_GND1 and the second power management chip BUCK_GND2 both use BUCK chips, and are both provided with a switch enable pin EN, an output voltage pin VCC, a switch start pin SW and a ground pin GND. The switch enable pin EN is connected to the AC enable port AC_EN. When the AC enable port AC_EN receives an AC enable signal, the BUCK chip starts to work. The basic working principle of the BUCK chip is: when the relevant switch tube is driven to a high level, the switch tube is turned on, the corresponding energy storage inductor is magnetized, the current increases linearly, and the corresponding capacitor is charged at the same time to provide energy for the load; when the switch tube is driven to a low level, the switch tube is turned off, the energy storage inductor is discharged through the corresponding freewheeling diode, the inductor current decreases linearly, and the output voltage is maintained by the corresponding output filter capacitor; the first control chip MCU1 and the second control chip MCU2 respectively play a role in overall control, and their specific models, parameters, etc. can be selected and set accordingly according to different scenarios, and there is no restriction here, such as using MCU, DSP, etc.; the switch driving element NM1 can be but not limited to using MOSFET, IGBT or GaN devices, etc.

[0045] In one embodiment, if Figure 1 As shown, the second power supply module 100 may include, but is not limited to, a first power conversion element LDO2, a first energy storage inductor L2, a first freewheeling diode D13, a second freewheeling diode D14, a first filter capacitor C6, a second filter capacitor C8 and a first energy storage capacitor C7. The output voltage pin VCC of the second power management chip BUCK_GND2 is connected to the second isolation ground GND2 through the first filter capacitor C6, the first freewheeling diode D13 connected in series, and the second freewheeling diode D14 and the first energy storage capacitor C7 connected in series. The first filter capacitor C6 is connected to the cathode of the first freewheeling diode D13, the first energy storage capacitor C7 is connected to the anode of the second freewheeling diode D14, and the first energy storage inductor L2 is arranged at the first connection and the second connection. The first power conversion element LDO2 is connected to the voltage output terminal of the second power management chip BUCK_GND2 to convert the output voltage of the second power management chip BUCK_GND2 into a target power voltage, and the target power voltage is used to provide an operating voltage for the second control chip MCU2, wherein the first connection is located between the first filter capacitor C6 and the cathode of the first freewheeling diode D13, and the second connection is located between the first energy storage capacitor C7 and the anode of the second freewheeling diode D14. The output voltage of the second power management chip BUCK_GND2 needs to be determined according to different chip parameters, specifications, etc., and the target power voltage needs to be adapted and set according to the specific specifications, parameters, etc. of the second control chip MCU2, which is not limited here, for example Figure 1The output voltage of the second power management chip BUCK_GND2 shown in the figure is 12V, and the target power supply voltage is 3.3V; the specific type of the first power conversion element LDO2 can be various, which is not limited here, for example, a 3.3V linear power supply is used.

[0046] It can be understood that the freewheeling circuit provided by the second freewheeling diode D14 can charge the first filter capacitor C6 connected to the output voltage pin VCC of the second power management chip BUCK_GND2, thereby providing a power supply voltage; the freewheeling circuit provided by the first freewheeling diode D13 can charge the first energy storage capacitor C7; similarly, referring to Figure 2 The first power supply module 300 may include, but is not limited to, a second power conversion element LDO1, a second energy storage inductor L1, a third freewheeling diode D5, a fourth freewheeling diode D6, a third filter capacitor C2, a fourth filter capacitor C4, and a second energy storage capacitor C3. The circuit setting method and basic working principle are similar to Figure 1 The second power supply module 100 shown is basically the same and can be understood similarly with reference to the above embodiment. To avoid redundancy, it is not described here. The output voltage of the second power conversion element LDO1 can be but is not limited to 18V, and the corresponding target power supply voltage is still 3.3V, that is, the specification of the second power conversion element LDO1 is 3.3V.

[0047] In one embodiment, if Figure 1 As shown, the secondary ground side rectifier module 200 includes a first diode D7, a second diode D8, a third diode D9 and a fourth diode D10. The first diode D7, the second diode D8, the third diode D9 and the fourth diode D10 are connected in a four-switch tube rectifier configuration commonly used in the art, so as to play a rectifying role. To avoid redundancy, they are not described here. In addition, a third energy storage capacitor C5 is also provided on one side of the secondary ground side rectifier module 200. One end of the third energy storage capacitor C5 is connected to the second reference ground, and the other end is connected to the switch start pin SW of the first power management chip BUCK_GND1. Its function is similar to that of the bus capacitor C1 in the primary ground side power supply unit.

[0048] In one embodiment, if Figure 2As shown, the primary ground-side power supply unit may also include, but is not limited to, a primary ground-side rectifier module 400 for outputting a rectified AC power voltage to the bus capacitor C1. The primary ground-side rectifier module 400 is respectively connected to the AC input terminal AC and the bus capacitor C1. The primary ground-side rectifier module 400 is set to rectify the input AC power voltage to ensure that a stable and reliable AC power voltage can be output to the relevant post-stage circuit, that is, the input AC power voltage can be kept stable, which is beneficial to improving the stability of the circuit operation in the grid-connected state. The structure of the primary ground-side rectifier module 400 is similar to that of the secondary ground-side rectifier module 200, and a four-switch tube rectifier configuration is also used for connection, which will not be elaborated here.

[0049] In one embodiment, if Figure 2 As shown, the primary ground side power supply unit also includes a mains soft-start resistor R1 for providing a mains voltage input, one end of the mains soft-start resistor R1 is connected to the mains input terminal AC, and the other end is connected to the primary ground side rectifier module 400. By setting the mains soft-start resistor R1, the mains voltage can be input in the form of a voltage carried by the mains soft-start resistor R1, thereby ensuring that the mains voltage is stably transmitted to the primary ground side rectifier module 400.

[0050] The low-voltage power supply circuit and application scenario of the bidirectional inverter described in the embodiment of the present invention are intended to more clearly illustrate the technical solution of the embodiment of the present invention, and do not constitute a limitation on the technical solution provided by the embodiment of the present invention. Those skilled in the art can know that with the evolution of the low-voltage power supply circuit of the bidirectional inverter and the emergence of new application scenarios, the technical solution provided by the embodiment of the present invention is also applicable to similar technical problems.

[0051] It can be understood by those skilled in the art that Figure 1 and Figure 2 The low-voltage power supply circuit of the bidirectional inverter shown does not constitute a limitation on the embodiments of the present invention, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0052] Based on the circuit topology of the low-voltage power supply circuit of the above-mentioned bidirectional inverter, various embodiments of the control method of the present invention are proposed.

[0053] Figure 3 A flow chart of a control method for a low-voltage power supply circuit of a bidirectional inverter provided in an embodiment of the present invention. The control method can be applied to, but is not limited to, Figure 1 and Figure 2 The low voltage power supply circuit of the bidirectional inverter shown in the figure is as follows: Figure 3 As shown, it specifically includes but is not limited to steps S1000 to S2000.

[0054] Figure 3This is a flow chart of a control method for a low-voltage power supply circuit of a bidirectional inverter provided in an embodiment of the present invention. The control method for a low-voltage power supply circuit of a bidirectional inverter may include but is not limited to steps S1000 to S2000.

[0055] Step S1000, real-time monitoring of voltage input conditions of the AC input terminal, the photovoltaic input terminal PV, and the battery input terminal BAT to obtain voltage input monitoring results;

[0056] Step S2000: Control the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the voltage input monitoring result.

[0057] In this step, the voltage input conditions of the mains input terminal AC, the photovoltaic input terminal PV and the battery input terminal BAT are monitored in real time to obtain the voltage input monitoring result. The voltage input monitoring result can reflect the current working mode of the bidirectional inverter, so that the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit can be controlled accordingly, which not only meets the working requirements of the inverter multi-mode startup, but also provides a more convenient and effective low-voltage power supply control method, which is conducive to energy saving and consumption reduction. In other words, when the bidirectional inverter is connected to the grid, it is necessary to take power from the grid to charge the energy storage battery, or when the Bypass instruction is turned on, the bypass needs to carry the electrical load, and at this time, the mains input terminal AC has a mains voltage input accordingly; when the bidirectional inverter is off-grid, it is necessary to take power from the energy storage battery and invert the electrical load, and at this time, the battery input terminal BAT has a battery voltage input accordingly; when the photovoltaic is connected, the photovoltaic port always keeps charging the battery, and at this time, the photovoltaic input terminal PV has a photovoltaic voltage input accordingly.

[0058] One embodiment of the present invention, as Figure 4 As shown, step S2000 may include but is not limited to step S2100.

[0059] Step S2100: When the voltage input monitoring result indicates that there is voltage input at the photovoltaic input terminal PV and there is no voltage input at the mains input terminal AC and the battery input terminal BAT, the secondary ground-side power supply unit is controlled by the second control chip MCU2 not to generate waves; or, when the voltage input monitoring result indicates that there is voltage input at the battery input terminal BAT and there is no voltage input at the mains input terminal AC and the photovoltaic input terminal PV, the secondary ground-side power supply unit is controlled by the second control chip MCU2 to generate waves.

[0060] One situation is that when the voltage input monitoring result indicates that there is voltage input at the battery input terminal BAT and there is no voltage input at the mains input terminal AC and the photovoltaic input terminal PV, that is, when the inverter is working, the battery input terminal BAT of the secondary ground side power supply unit is energized. If an AC enable signal is received, the second power management chip BUCK_GND2 starts to work, and finally outputs 12V_GND2 through the second power supply module 100, thereby supplying power to the secondary ground side power supply unit as a whole. The 12V_GND2 is then converted into 3.3V_GND2 by the first power conversion element LDO2, thereby supplying power to the second control chip MCU2 and related sampling circuits; at this time, the secondary ground side power supply unit is controlled to generate a wave to soft-start the bus, and the bus capacitor C1 is charged, and then The first power management chip BUCK_GND1 is then driven to output 18V_GND1 through the first power supply module 300, thereby supplying power to the primary ground side power supply unit as a whole. The 18V_GND1 is then converted into 3.3V_GND1 by the second power conversion element LDO1, thereby supplying power to the first control chip MCU1 and related sampling circuits. At this point, all the primary ground side power supply units are powered, and the bidirectional inverter generates waves to output a 230V inverter voltage. In this process, the switch driving element NM1 and the transformer T1 do not need to work. It can be seen that this control method can ensure that the primary ground side power supply unit and the secondary ground side power supply unit can all work normally during the inverter operation, thereby meeting the working requirements of the inverter to start the machine in the inverter mode.

[0061] Another situation is when the voltage input monitoring result indicates that there is voltage input at the photovoltaic input terminal PV and there is no voltage input at the mains input terminal AC and the battery input terminal BAT, that is, when the photovoltaic is working, all the secondary ground-side power supply units are powered, and the photovoltaic of the bidirectional inverter works normally. Since the working mode of the secondary ground-side power supply unit is similar to that of the inverter, it is not described here; this process controls the secondary ground-side power supply unit without waving, the bus capacitor C1 has no voltage, and the primary ground-side power supply unit does not work, which can improve the working efficiency in the photovoltaic mode and reduce energy consumption.

[0062] One embodiment of the present invention, as Figure 5 As shown, step S2000 may include but is not limited to steps S2200 to S2300.

[0063] Step S2200: when the voltage input monitoring result indicates that there is voltage input at the AC input terminal and there is no voltage input at the photovoltaic input terminal PV and the battery input terminal BAT, the real-time operating status of the bidirectional inverter is obtained;

[0064] Step S2300: Control the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the real-time operating state of the bidirectional inverter.

[0065] In this step, when the voltage input monitoring result indicates that there is voltage input at the AC input terminal AC and there is no voltage input at the photovoltaic input terminal PV and the battery input terminal BAT, it means that there is grid-connected input at this time, and the real-time operating status of the bidirectional inverter is further determined to judge which grid-connected mode the bidirectional inverter is in, so as to accurately and effectively control the working status of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the real-time operating status of the bidirectional inverter.

[0066] One embodiment of the present invention, as Figure 6 As shown, step S2300 may include but is not limited to step S2310.

[0067] Step S2310: When the bidirectional inverter is in the grid-connected working state, the first control chip MCU1 is used to control the primary ground-side power supply unit to generate waves; or, when the bidirectional inverter is in the grid-connected standby state, the first control chip MCU1 is used to control the primary ground-side power supply unit not to generate waves.

[0068] One situation is that when the bidirectional inverter is in a grid-connected working state, that is, when it is in grid-connected working state, the primary ground-side power supply unit soft-starts the mains soft-start resistor R1 and the primary ground-side rectifier module 400 through the mains input, thereby soft-starting the bus, and the bus capacitor C1 is energized, and then drives the first power management chip BUCK_GND1 to output 18V_GND1 through the first power supply module 300, thereby supplying power to the primary ground-side power supply unit as a whole, and 18V_GND1 is then converted into 3.3V_GND1 through the second power conversion element LDO1, thereby supplying power to the first control chip MCU1 and related sampling circuits; after the first control chip MCU1 is powered, if a charging start-up instruction is received at this time, the first control chip MCU1 is controlled to send a PWM signal to drive the switch drive element NM1. When the switch drive element NM1 is turned on, the first control chip MCU1 in the secondary ground-side power supply unit The first diode D7 and the fourth diode D10 are turned on, thereby charging the third energy storage capacitor C5, and providing an AC enable signal to turn on the second switch enable pin EN; when the switch driving element NM1 is turned off, the second diode D8 and the third diode D9 in the secondary ground side power supply unit are turned on, thereby charging the third energy storage capacitor C5, and providing an AC enable signal to turn on the second switch enable pin EN. In this process, the transformer T1 is demagnetized. At this time, the second power management chip BUCK_GND2 works normally. Similar to the inverter mode, all the secondary ground side power supply units are powered. At this point, the main topology of the bidirectional inverter can generate waves normally to realize the charging function. It can be seen that this control method can ensure that the primary ground side power supply unit and the secondary ground side power supply unit can all work normally during grid-connected operation, thereby meeting the working requirements of the inverter to start in grid-connected mode.

[0069] Another situation is that when in grid-connected standby mode, there is no need to charge the battery and there is no charging startup instruction. At this time, the first power management chip BUCK_GND1 works normally. The working principle of this part is consistent with the grid-connected working mode, so that all the primary ground side power supply units are powered. At this time, the first control chip MCU1 is controlled not to send a PWM signal, and the switch driving element NM1 and the transformer T1 do not need to work. Therefore, all the secondary ground side power supply units do not work. Compared with the relevant existing technology, it saves more energy consumption. After actual test detection, the energy consumption is usually reduced by more than 40%.

[0070] It should be noted that, for convenience, the above embodiments only describe the specific working principles of a single starting condition. For multifunctional starting, the embodiments of the present invention are still applicable. In this case, the multifunctional starting needs to be combined through a certain logic, that is, the starting logic of the combined condition and the starting logic of the single condition are in an "and" relationship. For example, when the voltage input monitoring result indicates that there is no voltage input at the AC input terminal AC and there is voltage input at the photovoltaic input terminal PV and the battery input terminal BAT, it means that they are in the photovoltaic mode and the inverter mode at the same time. Then, according to the starting logics of the above photovoltaic mode and the inverter mode, they are started respectively, so that the multifunctional starting in the photovoltaic mode and the inverter mode can be realized. The other multifunctional starting conditions are similar and will not be described in detail.

[0071] Figure 7 FIG. 1 is a schematic diagram of the structure of an electronic device 1000 provided by an embodiment of the present invention. Figure 7 As shown, the electronic device 1000 includes a memory 1100 and a processor 1200. The number of the memory 1100 and the processor 1200 may be one or more. Figure 7 In the embodiment, a memory 1100 and a processor 1200 are taken as an example; the memory 1100 and the processor 1200 in the device may be connected via a bus or other means. Figure 7 The example of connecting through bus is taken in the following.

[0072] The memory 1100, as a computer-readable storage medium, can be used to store software programs, computer executable programs and modules, such as program instructions / modules corresponding to the control method of the low-voltage power supply circuit of the bidirectional inverter provided in any embodiment of the present invention. The processor 1200 implements the control method of the low-voltage power supply circuit of the bidirectional inverter by running the software programs, instructions and modules stored in the memory 1100.

[0073] The memory 1100 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function. In addition, the memory 1100 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some instances, the memory 1100 may further include a memory remotely arranged relative to the processor 1200, and these remote memories may be connected to the device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0074] An embodiment of the present invention further provides a computer-readable storage medium storing computer-executable instructions for executing a control method for a low-voltage power supply circuit of a bidirectional inverter as provided in any embodiment of the present invention.

[0075] An embodiment of the present invention also provides a computer program product, including a computer program or computer instructions, wherein the computer program or computer instructions are stored in a computer-readable storage medium, a processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium, and the processor executes the computer program or computer instructions, so that the computer device executes a control method for a low-voltage power supply circuit of a bidirectional inverter as provided in any embodiment of the present invention.

[0076] The electronic devices and application scenarios described in the embodiments of the present invention are intended to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention. Those skilled in the art will appreciate that with the evolution of electronic devices and the emergence of new application scenarios, the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

[0077] Those skilled in the art will appreciate that all or some of the steps in the methods disclosed above, and the functional modules / units in the systems and devices may be implemented as software, firmware, hardware, or a suitable combination thereof.

[0078] In hardware implementation, the division between the functional modules / units mentioned in the above description does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed by several physical components in cooperation. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or non-transitory medium) and a communication medium (or transient medium). As is well known to those of ordinary skill in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0079] The terms "component", "module", "system", etc. used in this specification are used to represent computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, or a computer. By way of illustration, both applications running on a computing device and a computing device can be components. One or more components may reside in a process or an execution thread, and a component may be located on a computer or distributed between two or more computers. In addition, these components may be executed from various computer-readable media having various data structures stored thereon. Components may, for example, communicate through a local or remote process based on a signal having one or more data packets (e.g., data from two components interacting with another component between a local system, a distributed system, or a network, such as the Internet interacting with other systems through signals).

Claims

1. A low voltage power supply circuit for a bidirectional inverter, characterized in that: include: A primary ground side power supply unit is arranged on one side of a preset first isolation ground, and the primary ground side power supply unit includes a mains input terminal, a bus capacitor, a first power management chip, a first power supply module, a first control chip, a switch drive element and a transformer, wherein the bus capacitor is respectively connected to the primary winding of the transformer, the first power management chip and the mains input terminal, the first power management chip is connected to the first control chip through the first power supply module, and the primary winding of the transformer is also connected to the first control chip through the switch drive element, wherein the bus capacitor is used to provide a starting voltage to the first power management chip after soft start, the first control chip is used to output a PWM signal to turn on or off the switch drive element, and the first power supply module is used to provide a working voltage to the first control chip; A secondary ground side power supply unit is arranged on one side of a preset second isolation ground, and the secondary ground side power supply unit includes a photovoltaic input terminal, a battery input terminal, a secondary ground side rectifier module, a second power management chip, a second power supply module and a second control chip. The photovoltaic input terminal and the battery input terminal are both connected to the second power management chip, and the secondary ground side rectifier module is respectively connected to the secondary winding of the transformer and the second power management chip. The second power management chip is also connected to the second control chip through the second power supply module, wherein the secondary ground side rectifier module is used to provide a demagnetization circuit for the transformer, the second power supply module is used to provide an operating voltage to the second control chip, and the second control chip is used to control the wave generation of the secondary ground side power supply unit.

2. The low voltage power supply circuit of the bidirectional inverter according to claim 1, characterized in that: The second power supply module includes a first power conversion element, a first energy storage inductor, a first freewheeling diode, a second freewheeling diode, a first filter capacitor, a second filter capacitor and a first energy storage capacitor. The output voltage pin of the second power management chip is connected to the second isolation ground through the first filter capacitor, the first freewheeling diode, the second freewheeling diode and the first energy storage capacitor connected in series, respectively. The first filter capacitor is connected to the cathode of the first freewheeling diode, the first energy storage capacitor is connected to the anode of the second freewheeling diode, the first energy storage inductor is arranged between the first connection point and the second connection point, and the first power conversion element is connected to the voltage output end of the second power management chip to convert the output voltage of the second power management chip into a target power supply voltage, and the target power supply voltage is used to provide a working voltage for the second control chip, wherein the first connection point is located between the first filter capacitor and the cathode of the first freewheeling diode, and the second connection point is located between the first energy storage capacitor and the anode of the second freewheeling diode.

3. The low voltage power supply circuit of the bidirectional inverter according to claim 1, characterized in that: The primary ground-side power supply unit further comprises a primary ground-side rectifier module for outputting a rectified mains voltage to the bus capacitor, and the primary ground-side rectifier module is respectively connected to the mains input terminal and the bus capacitor.

4. The low voltage power supply circuit of the bidirectional inverter according to claim 3, characterized in that: The primary ground side power supply unit also includes a mains soft-start resistor for providing a mains voltage input, one end of the mains soft-start resistor is connected to the mains input terminal, and the other end is connected to the primary ground side rectifier module.

5. A control method for a low-voltage power supply circuit of a bidirectional inverter according to any one of claims 1 to 4, characterized in that: include: Performing real-time monitoring on the voltage input conditions of the mains input terminal, the photovoltaic input terminal and the battery input terminal to obtain a voltage input monitoring result; The working states of the primary ground-side power supply unit and the secondary ground-side power supply unit are controlled according to the voltage input monitoring result.

6. The control method according to claim 5, characterized in that: The controlling the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the voltage input monitoring result includes: When the voltage input monitoring result indicates that there is voltage input at the photovoltaic input terminal and there is no voltage input at the mains input terminal and the battery input terminal, the secondary ground-side power supply unit is controlled by the second control chip not to generate waves; or, When the voltage input monitoring result indicates that there is voltage input at the battery input terminal and there is no voltage input at the mains input terminal and the photovoltaic input terminal, the second control chip is used to control the secondary ground-side power supply unit to generate waves.

7. The control method according to claim 5, characterized in that: The controlling the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the voltage input monitoring result includes: When the voltage input monitoring result indicates that there is voltage input at the mains input terminal and there is no voltage input at the photovoltaic input terminal and the battery input terminal, the real-time operating status of the bidirectional inverter is obtained; According to the real-time operating status of the bidirectional inverter, the operating status of the primary ground-side power supply unit and the secondary ground-side power supply unit are controlled.

8. The control method according to claim 7, characterized in that: The controlling the working states of the primary ground-side power supply unit and the secondary ground-side power supply unit according to the real-time operating state of the bidirectional inverter includes: When the bidirectional inverter is in a grid-connected working state, the primary ground-side power supply unit is controlled to generate waves through the first control chip; or, When the bidirectional inverter is in a grid-connected standby state, the first control chip controls the primary ground-side power supply unit to not generate waves.

9. An electronic device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When at least one of the programs is executed by at least one of the processors, the method for controlling a low-voltage power supply circuit of a bidirectional inverter as claimed in any one of claims 5 to 8 is implemented.

10. A computer-readable storage medium, characterized in that: A program executable by a processor is stored therein, and when the program executable by the processor is executed by the processor, it is used to implement the control method of the low-voltage power supply circuit of the bidirectional inverter as described in any one of claims 5 to 8.

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