Direct current micro-grid networking circuit and electronic equipment

Abstract

A DC microgrid networking circuit and electronic device, belonging to the field of electronic circuit technology, includes at least two parallel energy sub-circuits. Each energy sub-circuit is connected to a power supply module and a load. The energy sub-circuit includes a first decision circuit and a first switching circuit. The power supply module provides DC power to the grid-connected bus and the load. The first decision circuit controls the first switching circuit to open when the voltage of the DC power supply is greater than a preset voltage, and controls the first switching circuit to open when the voltage of the DC power supply is less than the preset voltage, so as to connect to the DC power input from the grid-connected bus. The load operates according to the DC power supplied by the power supply module or the DC power input from the grid-connected bus. Therefore, without the need for a complex PI regulator, when the power supply module is insufficient, the backup terminal (such as the grid-connected bus on the microgrid side) can reverse to supply power to the load, reducing energy waste or the possibility of power supply interruption, simplifying hardware design, and reducing costs.

Description

Technical Field

[0001] This application belongs to the field of electronic circuit technology, and in particular relates to a DC microgrid networking circuit and electronic equipment. Background Technology

[0002] The relevant DC microgrid networking circuits require the configuration of a main error amplifier to sample the bus voltage on the power controller side and compare it with the set reference value of the bus voltage on the power controller side. Then, a PI regulator is used to generate the main error amplifier signal voltage to regulate the power supply direction. This results in complex hardware design and high cost in the DC microgrid networking circuits.

[0003] Therefore, the hardware design of the related DC microgrid networking circuit is complex and costly. Summary of the Invention

[0004] The purpose of this application is to provide a DC microgrid networking circuit and electronic equipment, which aims to solve the problems of complex and costly hardware design of related DC microgrid networking circuits.

[0005] This application provides a DC microgrid networking circuit, including at least two parallel energy sub-circuits. The energy sub-circuits are connected to a power module and a load. Each energy sub-circuit includes a first decision circuit and a first switching circuit. The power module is connected to the grid bus and is used to provide DC power to the grid bus and the load. The first decision circuit, connected to the first switching circuit and the power module, is used to control the first switching circuit to open in response to the voltage of the supplied DC power being greater than a preset voltage, and to control the first switching circuit to open in response to the voltage of the supplied DC power being less than a preset voltage, so as to connect to the supplied DC power input from the grid-connected bus. The load is connected to the power module and is used to operate according to the DC power supplied by the power module or the DC power input from the grid bus; the first decision circuit includes: The first sampling circuit is connected to the power supply module and is used to sample the voltage of the DC power supplied by the power supply module in order to output a first sampling signal. A first driving circuit, connected to the first sampling circuit and the first switching circuit, is used to output a first decision signal in response to the first sampling signal being greater than a preset value, and to disconnect the output of the first decision signal in response to the first sampling signal being less than the preset value. The first switching circuit is used to transmit the DC power supply input from the grid-connected bus to supply power to the load in response to the first decision signal, and to disconnect the DC power supply input from the grid-connected bus in response to the disconnection of the first decision signal.

[0006] In one embodiment, it further includes: The second decision circuit, connected to the power module, the load, and the first switching circuit, is used to control the first switching circuit to disconnect in response to the current of the DC power input to the grid bus being greater than a first preset current.

[0007] In one embodiment, the second decision circuit includes: The second sampling circuit is connected to the load, the first switching circuit and the power module, and is used to sample the current of the DC power supplied by the grid-connected bus to output a second sampling signal. A first comparison circuit, connected to the second sampling circuit, is used to compare the second sampled signal with a first reference voltage to output a second decision signal; The first switching circuit is also used to disconnect the DC power supply input to the grid-connected bus in response to the second decision signal.

[0008] In one embodiment, it further includes: The third decision circuit, connected to the load and the first switching circuit, is used to output a third decision signal in response to the current of the DC power supplied by the power module being greater than the second preset current. The second switching circuit, connected to the power supply module and the third decision circuit, is used to disconnect the DC power supply output from the power supply module to the load in response to the third decision signal.

[0009] In one embodiment, the third decision circuit includes: The third sampling circuit, connected to the second switching circuit, is used to sample the current of the DC power supplied by the power module to output a third sampling signal. The second comparison circuit, connected to the third sampling circuit, is used to compare the third sampling signal with the second reference voltage to output a third decision signal; The second switching circuit is used to transmit the DC power supplied by the power module to the load in response to the third decision signal, and to disconnect the DC power supplied by the power module in response to the disconnection of the third decision signal.

[0010] In one embodiment, it further includes: The fourth decision circuit, connected to the grid bus, is used to output a fourth decision signal in response to the current of the DC power supplied by the power module being greater than the third preset current. The third switching circuit is connected to the power supply module and the fourth decision circuit, and is used to disconnect the DC power supply output by the power supply module to the grid bus in response to the fourth decision signal.

[0011] In one embodiment, the fourth decision circuit includes: The fourth sampling circuit, connected to the third switching circuit, is used to sample the current of the DC power supplied by the power module to output a fourth sampling signal. The third comparison circuit, connected to the fourth sampling circuit, is used to compare the fourth sampling signal with the third reference voltage to output a fourth decision signal; The third switching circuit is used to transmit the DC power supplied by the power module to the grid bus in response to the fourth decision signal, and to disconnect the DC power supplied by the power module in response to the disconnection of the fourth decision signal.

[0012] In one embodiment, the power module includes: Photovoltaic units are used for photovoltaic power generation to provide photovoltaic voltage; An energy storage unit, connected to the photovoltaic unit, is used to charge the photovoltaic unit based on the photovoltaic voltage to output an energy storage voltage; The filtering unit, connected to the energy storage unit, the photovoltaic unit, and the first switching circuit, is used to filter and suppress the energy storage voltage to output the DC power supply.

[0013] This invention also provides an electronic device, which includes the aforementioned DC microgrid networking circuit.

[0014] The beneficial effects of this invention compared to the prior art are as follows: Since it includes at least two parallel energy sub-circuits connected to the power module and the load, each energy sub-circuit includes a first decision circuit and a first switching circuit. The power module provides DC power to the grid bus and the load. The first decision circuit controls the first switching circuit to open when the voltage of the DC power is greater than a preset voltage, and controls the first switching circuit to open when the voltage of the DC power is less than the preset voltage, to connect to the DC power input from the grid bus. The load operates based on either the DC power provided by the power module or the DC power input from the grid bus. Therefore, without the need for a complex PI regulator, when the power module's power supply is insufficient, the backup terminal (such as the grid bus on the microgrid side) can reverse the power supply to the load, reducing energy waste or the possibility of power supply interruption, simplifying hardware design, and lowering costs. Attached Figure Description

[0015] To more clearly illustrate the technical inventions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a DC microgrid networking circuit provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the first decision circuit in a DC microgrid networking circuit provided in an embodiment of this application; Figure 3 This is a schematic diagram of another structure of a DC microgrid networking circuit provided in an embodiment of this application; Figure 4 This is a schematic diagram of a second decision circuit in a DC microgrid networking circuit provided in an embodiment of this application; Figure 5 This is a schematic diagram of another structure of a DC microgrid networking circuit provided in an embodiment of this application; Figure 6 This is a schematic diagram of the structure of a third decision circuit in a DC microgrid networking circuit provided in an embodiment of this application; Figure 7 This is a schematic diagram of another structure of a DC microgrid networking circuit provided in an embodiment of this application; Figure 8 A schematic diagram of the fourth decision circuit in a DC microgrid networking circuit provided in an embodiment of this application; Figure 9 This is a schematic diagram of a power module in a DC microgrid networking circuit according to an embodiment of this application; Figure 10 This is a partial example circuit schematic diagram of a DC microgrid networking circuit provided in an embodiment of this application. Detailed Implementation

[0017] To make the technical problems, technical solutions, and beneficial effects to be solved by 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 are not intended to limit the scope of this application.

[0018] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0019] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0021] Figure 1 A schematic diagram of the DC microgrid networking circuit provided in a preferred embodiment of this application is shown. For ease of explanation, only the parts relevant to this embodiment are shown, and are described in detail below: The above-mentioned DC microgrid networking circuit includes at least two parallel energy sub-circuits, which are connected to the power module 90 and the load 80. The energy sub-circuit includes a first decision circuit 10 and a first switching circuit 20. The power module 90 is connected to the grid bus and is used to provide DC power to the grid bus and the load 80. The first decision circuit 10 is connected to the first switch circuit 20 and the power module 90. It is used to control the first switch circuit 20 to open in response to the voltage of the supplied DC power being greater than the preset voltage, and to control the first switch circuit 20 to open in response to the voltage of the supplied DC power being less than the preset voltage so as to connect to the supplied DC power input from the grid bus. Load 80 is connected to power module 90 and is used to operate based on the DC power supplied by power module 90 or the DC power input from the grid bus.

[0022] Understandably, the various energy sub-circuits are connected via interfaces.

[0023] It should be noted that the above-mentioned DC microgrid networking circuit has two operating states. In the first operating state, the voltage of the DC power supplied by the power module 90 is greater than the preset voltage. The first decision circuit 10 controls the first switch circuit 20 to disconnect and stop transmitting the DC power input from the grid-connected bus. The load 80 operates according to the DC power supplied by the power module 90. In the second operating state, the voltage of the DC power supplied by the power module 90 is less than the preset voltage. The first decision circuit 10 controls the first switch circuit 20 to turn on and transmit the DC power input from the grid-connected bus to the load 80. The load 80 operates according to the DC power supplied by the grid-connected bus.

[0024] With the above technical solution, without the need to configure a complex PI regulator, when the power supply module 90 is insufficient, the backup end (such as the grid-connected bus on the microgrid side) can reverse to supply power to the load 80, reducing the possibility of energy waste or power supply continuity interruption, simplifying hardware design and reducing costs.

[0025] like Figure 2 As shown, the first decision circuit 10 includes a first sampling circuit 11 and a first driving circuit 12.

[0026] The first sampling circuit 11 is connected to the power supply module 90 and is used to sample the voltage of the DC power supplied by the power supply module 90 to output a first sampling signal.

[0027] The first driving circuit 12 is connected to the first sampling circuit 11 and the first switching circuit 20, and is used to output a first decision signal in response to the first sampling signal being less than a preset value, and to disconnect the output of the first decision signal in response to the first sampling signal being greater than the preset value.

[0028] The first switching circuit 20 is used to transmit the DC power supply input from the grid-connected bus to power the load 80 in response to the first decision signal, and to disconnect the DC power supply input from the grid-connected bus in response to the disconnection of the first decision signal. It is understood that the first switching circuit 20 has two operating states; in the first operating state, when the first decision signal is disconnected, the first switching circuit 20 disconnects and stops transmitting the DC power supply input from the grid-connected bus; in the second operating state, when the first decision signal is received, the first switching circuit 20 turns on and transmits the DC power supply input from the grid-connected bus to the load 80.

[0029] The first driving circuit 12 may include a transistor, and the preset value may be the threshold value of the transistor.

[0030] The above technical solution eliminates the need for a complex PI regulator, enabling the determination of the power supply status of the power module 90, thus simplifying hardware design and reducing costs.

[0031] like Figure 3As shown, the above-mentioned DC microgrid networking circuit also includes a second decision circuit 30.

[0032] The second decision circuit 30 is connected to the power module 90, the load 80 and the first switch circuit 20, and is used to control the first switch circuit 20 to disconnect in response to the current of the DC power supplied by the grid bus being greater than the first preset current.

[0033] Through the above technical solution, when the current of the DC power supply input to the grid-connected bus exceeds the first preset current, the first switch circuit 20 is controlled to disconnect, thereby realizing overcurrent protection of the DC power supply input to the grid-connected bus and improving the reliability and safety of the DC microgrid networking circuit.

[0034] like Figure 4 As shown, the second decision circuit 30 includes a second sampling circuit 31 and a first comparison circuit 32.

[0035] The second sampling circuit 31 is connected to the load 80, the first switching circuit 20 and the power module 90, and is used to sample the current of the DC power supplied by the grid-connected bus input to output a second sampling signal. The first comparison circuit 32 is connected to the second sampling circuit 31 and is used to compare the second sampling signal with the first reference voltage to output a second decision signal; wherein, the first reference voltage is the threshold voltage of the second sampling signal and is used to determine whether the current of the DC power supplied by the grid-connected bus is overcurrent.

[0036] The first switching circuit 20 is also used to disconnect the DC power supply input to the grid bus in response to the second decision signal.

[0037] With the above technical solution, only the second sampling circuit 31 and the first comparison circuit 32 need to be configured to realize the overcurrent determination of the DC power supply input to the grid-connected bus. The circuit is simple, reliable and low cost.

[0038] like Figure 5 As shown, the above-mentioned DC microgrid networking circuit also includes a third decision circuit 40 and a second switching circuit 50.

[0039] The third decision circuit 40 is connected to the load 80 and the first switching circuit 20, and is used to output a third decision signal in response to the current of the DC power supplied by the power module 90 being greater than the second preset current. The second switching circuit 50 is connected to the power supply module 90 and the third decision circuit 40, and is used to disconnect the DC power supply from the power supply module 90 to the load 80 in response to the third decision signal.

[0040] Through the above technical solution, when the current of the DC power supplied by the power module 90 is greater than the second preset current, the second switching circuit 50 is controlled to disconnect, thereby realizing overcurrent protection of the DC power supplied by the power module 90 to the load 80 and improving the reliability and safety of the DC microgrid networking circuit.

[0041] like Figure 6 As shown, the third decision circuit 40 includes a third sampling circuit 41 and a second comparison circuit 42.

[0042] The third sampling circuit 41 is connected to the second switching circuit 50 and is used to sample the current of the DC power supplied by the power module 90 to output the third sampling signal. The second comparison circuit 42 is connected to the third sampling circuit 41 and is used to compare the third sampling signal with the second reference voltage to output a third decision signal; wherein the second reference voltage is the threshold voltage of the third sampling signal and is used to determine whether the current of the DC power supplied by the power supply module 90 is overcurrent.

[0043] The second switching circuit 50 is used to transmit the DC power supplied by the power module 90 to the load 80 in response to the third decision signal, and to disconnect the DC power supplied by the power module 90 in response to the disconnection of the third decision signal. In one embodiment, the third decision signal is low level, and the disconnection of the third decision signal means that the second comparator circuit 42 outputs a high level signal.

[0044] With the above technical solution, only the third sampling circuit 41 and the second comparison circuit 42 need to be configured to realize the overcurrent determination of the DC power supplied by the power module 90. The circuit is simple, reliable and low cost.

[0045] like Figure 7 As shown, the DC microgrid networking circuit also includes a fourth decision circuit 60 and a third switching circuit 70.

[0046] The fourth decision circuit 60 is connected to the grid bus and is used to output a fourth decision signal in response to the current of the DC power supplied by the power module 90 being greater than the third preset current. The third switching circuit 70 is connected to the power supply module 90 and the fourth decision circuit 60, and is used to disconnect the DC power supply output from the power supply module 90 to the grid bus in response to the fourth decision signal.

[0047] Through the above technical solution, when the current of the DC power supplied by the power module 90 is greater than the third preset current, the third switch circuit 70 is controlled to disconnect, thereby realizing overcurrent protection of the DC power supplied by the power module 90 to the grid bus and improving the reliability and safety of the DC microgrid networking circuit.

[0048] like Figure 8As shown, the fourth decision circuit 60 includes a fourth sampling circuit 61 and a third comparison circuit 62.

[0049] The fourth sampling circuit 61 is connected to the third switching circuit 70 and is used to sample the current of the DC power supplied by the power module 90 to output the fourth sampling signal. The third comparison circuit 62 is connected to the fourth sampling circuit 61 and is used to compare the fourth sampling signal with the third reference voltage to output a fourth decision signal; wherein, the third reference voltage is the threshold voltage of the fourth sampling signal and is used to determine whether the current of the DC power supplied by the power supply module 90 is overcurrent.

[0050] The third switching circuit 70 is used to transmit the DC power supplied by the power supply module 90 to the grid bus in response to the fourth decision signal, and to disconnect the DC power supplied by the power supply module 90 in response to the disconnection of the fourth decision signal. In one embodiment, the fourth decision signal is low level, and the disconnection of the fourth decision signal means that the third comparator circuit 62 outputs a high level signal.

[0051] With the above technical solution, only the fourth sampling circuit 61 and the third comparison circuit 62 need to be configured to realize the overcurrent determination of the DC power supplied by the power module 90. The circuit is simple, reliable and low cost.

[0052] like Figure 9 As shown, the power module 90 includes a photovoltaic unit 91, an energy storage unit 92, and a filter unit 93.

[0053] Photovoltaic unit 91 is used for photovoltaic power generation to provide photovoltaic voltage; Energy storage unit 92, connected to photovoltaic unit 91, is used for charging based on photovoltaic voltage to output energy storage voltage; The filter unit 93 is connected to the energy storage unit 92, the photovoltaic unit 91 and the first switching circuit 20, and is used to filter the energy storage voltage and suppress common mode to output the power supply DC.

[0054] The above technical solutions provide a stable energy source for DC microgrid network circuits and improve the stability of DC microgrid network circuits.

[0055] Figure 10 The illustration shows a partial example circuit structure of a DC microgrid networking circuit provided by an embodiment of the present invention. For ease of explanation, only the parts related to the embodiment of the present invention are shown, and are described in detail below: The first sampling circuit 11 includes a first resistor R1 and a second resistor R2; the first end of the first resistor R1 forms the input terminal of the first sampling circuit 11 and is connected to the power supply module 90 to receive the DC power supplied by the power supply module 90; the second end of the first resistor R1 and the first end of the second resistor R2 are connected and together form the output terminal of the first sampling circuit 11, which is connected to the first driving circuit 12 to output the first sampling signal; the second end of the second resistor R2 is connected to the power supply ground.

[0056] The first driving circuit 12 includes a first transistor Q1; the gate of the first transistor Q1 forms the input terminal of the first driving circuit 12 and is connected to the first sampling circuit 11 to receive the first sampling signal; the collector of the first transistor Q1 forms the output terminal of the first driving circuit 12 and is connected to the first switching circuit 20 to output the first decision signal; the emitter of the first transistor Q1 is connected to the power supply ground.

[0057] The first switching circuit 20 includes a first PMOS transistor P1, a second PMOS transistor P2, a second transistor Q2, a third resistor R3, and a fourth resistor R4. The drain of the second PMOS transistor P2 forms the input terminal of the first switching circuit 20, which is connected to the grid bus to receive the DC power supplied by the grid bus. The drain of the first PMOS transistor P1 forms the output terminal of the first switching circuit 20, which is connected to the second decision circuit 30 to output the DC power supplied by the grid bus. The base of the second transistor Q2 and the first resistor R4... The terminals are connected and together form the control terminal of the first switching circuit 20, and are connected to the first driving circuit 12 and the second decision circuit 30 to receive the first decision signal and the second decision signal; the collector of the second transistor Q2 is connected to the gate of the first PMOS transistor P1, the gate of the second PMOS transistor P2 and the first terminal of the third resistor R3, the drain of the first PMOS transistor P1 is connected to the drain of the second PMOS transistor P2 and the second terminal of the third resistor R3, and the emitter of the second transistor Q2 and the second terminal of the fourth resistor R4 are connected to the power supply ground.

[0058] The second sampling circuit 31 includes a first operational amplifier U1, a first capacitor C1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The first terminal of the fifth resistor R5 and the second terminal of the seventh resistor R7 are connected and together form the current input terminal of the second sampling circuit 31, which is connected to the first switching circuit 20 to receive the DC power supplied by the grid-connected bus. The second terminals of the fifth resistor R5 and the sixth resistor R6 are connected and together form the current output terminal of the second sampling circuit 31, which is connected to the power module 90 and the load 80 to output the DC power supplied by the grid-connected bus. The first terminal of the sixth resistor R6 is connected to the inverting input terminal of the first operational amplifier U1 and the second terminal of the eighth resistor R8. The first end of the seventh resistor R7 is connected to the non-inverting input terminal of the first operational amplifier U1 and the first end of the ninth resistor R9. The first end of the eighth resistor R8 is connected to the output terminal of the first operational amplifier U1, the first end of the first capacitor C1, and the second end of the tenth resistor R10. The negative power supply terminal of the first operational amplifier U1, the second end of the ninth resistor R9, and the second end of the first capacitor C1 are all connected to the power ground. The first end of the tenth resistor R10 constitutes the sampling signal output terminal of the second sampling circuit 31 and is connected to the first comparator circuit 32 to output the second sampling signal. The positive power supply terminal of the first operational amplifier U1 constitutes the power supply terminal of the second sampling circuit 31 and is connected to the grid bus and the first switching circuit 20 to access the DC power supplied by the grid bus.

[0059] The first comparator circuit 32 includes a first comparator CMP1, an eleventh resistor R11, a twelfth resistor R12, and a thirteenth resistor R13. The first terminal of the eleventh resistor R11 forms the first input terminal of the first comparator circuit 32, which is connected to the grid bus and the first switching circuit 20 to receive the DC power supplied by the grid bus. The non-inverting input terminal of the first comparator CMP1 is connected to the second terminal of the eleventh resistor R11 and the first terminal of the twelfth resistor R12, and the second terminal of the twelfth resistor R12 is connected to the power ground. The inverting input terminal of the first comparator CMP1 forms the second input terminal of the first comparator circuit 32, which is connected to the second sampling circuit 31 to receive the second sampling signal. The output terminal of the first comparator CMP1 is connected to the first terminal of the thirteenth resistor R13. The second terminal of the thirteenth resistor R13 forms the output terminal of the first comparator circuit 32, which is connected to the first switching circuit 20 and the first decision circuit 10 to output the second decision signal.

[0060] The third sampling circuit 41 includes a second operational amplifier U2, a second capacitor C2, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, and a nineteenth resistor R19. The first terminal of the fourteenth resistor R14 and the second terminal of the sixteenth resistor R16 are connected and together form the current input terminal of the third sampling circuit 41, which is connected to the second switching circuit 50 to receive the DC power supplied by the power supply module 90. The second terminals of the fourteenth resistor R14 and the seventeenth resistor R17 are connected and together form the current output terminal of the third sampling circuit 41, which is connected to the first switching circuit 20 and the load 80 to output the DC power supplied by the power supply module 90. The first terminal of the seventeenth resistor R17 is connected to the inverting input terminal of the second operational amplifier U2 and the eighteenth resistor R19. The second end of resistor R18 is connected to the first end of the sixteenth resistor R16, which is connected to the non-inverting input of the second operational amplifier U2 and the first end of the fifteenth resistor R15. The second end of the nineteenth resistor R19 is connected to the output of the second operational amplifier U2, the first end of the second capacitor C2, and the first end of the eighteenth resistor R18. The negative power supply terminal of the second operational amplifier U2, the second end of the fifteenth resistor R15, and the second end of the second capacitor C2 are all connected to the power ground. The first end of the nineteenth resistor R19 constitutes the sampling signal output terminal of the third sampling circuit 41, which is connected to the second comparator circuit 42 to output the third sampling signal. The positive power supply terminal of the second operational amplifier U2 constitutes the power supply terminal of the third sampling circuit 41, which is connected to the power module 90 and the second switching circuit 50 to access the DC power supplied by the power module 90.

[0061] The second comparator circuit 42 includes a second comparator CMP2, a twentieth resistor R20, a twenty-first resistor R21, and a twenty-second resistor R22. The first terminal of the twenty-first resistor R21 forms the first input terminal of the second comparator circuit 42, which is connected to the power supply module 90 and the first switching circuit 20 to receive the DC power supplied by the power supply module 90. The non-inverting input terminal of the second comparator CMP2 is connected to the second terminal of the twenty-first resistor R21 and the first terminal of the twenty-second resistor R22, and the second terminal of the twenty-second resistor R22 is connected to the power supply ground. The inverting input terminal of the second comparator CMP2 forms the second input terminal of the second comparator circuit 42, which is connected to the third sampling circuit 41 to receive the third sampling signal. The output terminal of the second comparator CMP2 is connected to the first terminal of the twentieth resistor R20. The second terminal of the twentieth resistor R20 forms the output terminal of the second comparator circuit 42, which is connected to the second switching circuit 50 to output the third decision signal.

[0062] The second switching circuit 50 includes a third PMOS transistor P3, a fourth PMOS transistor P4, a third transistor Q3, a twenty-third resistor R23, and a twenty-fourth resistor R24. The drain of the third PMOS transistor P3 forms the input terminal of the second switching circuit 50 and is connected to the power supply module 90 to receive the DC power supplied by the power supply module 90. The drain of the fourth PMOS transistor P4 forms the output terminal of the second switching circuit 50 and is connected to the third decision circuit 40 to output the DC power supplied by the power supply module 90. The base of the third transistor Q3 and the first end of the second fourteenth resistor R24 ​​are connected and together form the control terminal of the second switching circuit 50, which is connected to the third decision circuit 40 to receive the third decision signal. The collector of the third transistor Q3 is connected to the gate of the third PMOS transistor P3, the gate of the fourth PMOS transistor P4, and the first end of the second three-third resistor R23. The drain of the third PMOS transistor P3 is connected to the drain of the fourth PMOS transistor P4 and the second end of the second three-third resistor R23. The emitter of the third transistor Q3 and the second end of the second fourteenth resistor R24 ​​are connected to the power supply ground.

[0063] The fourth sampling circuit 61 includes a third operational amplifier U3, a third capacitor C3, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, and a thirtieth resistor R30. The first terminal of the twenty-fifth resistor R25 and the second terminal of the twenty-seventh resistor R27 are connected and together form the current input terminal of the fourth sampling circuit 61, which is connected to the third switching circuit 70 to receive the DC power supplied by the power module 90. The second terminal of the twenty-fifth resistor R25 and the second terminal of the twenty-eighth resistor R28 are connected and together form the current output terminal of the fourth sampling circuit 61, which is connected to the third switching circuit 70 to output the DC power supplied by the power module 90. The first terminal of the twenty-eighth resistor R28 is connected to the inverting input terminal of the third operational amplifier U3 and the thirtieth resistor R30. The second end of resistor R18 is connected to the first end of the sixteenth resistor R16, which is connected to the non-inverting input of the third operational amplifier U3 and the first end of the twenty-sixth resistor R26. The second end of the thirtieth resistor R30 is connected to the output of the third operational amplifier U3, the first end of the third capacitor C3, and the first end of the twenty-ninth resistor R29. The negative power supply terminal of the third operational amplifier U3, the second end of the twenty-sixth resistor R26, and the second end of the third capacitor C3 are all connected to the power ground. The first end of the thirtieth resistor R30 constitutes the sampling signal output terminal of the fourth sampling circuit 61, which is connected to the third comparator circuit 62 to output the fourth sampling signal. The positive power supply terminal of the third operational amplifier U3 constitutes the power supply terminal of the fourth sampling circuit 61, which is connected to the power module 90 and the third switching circuit 70 to access the DC power supplied by the power module 90.

[0064] The third comparator circuit 62 includes a third comparator CMP3, a thirty-first resistor R31, a thirty-second resistor R32, and a thirty-third resistor R33. The first terminal of the thirty-first resistor R31 forms the first input terminal of the third comparator circuit 62, which is connected to the power supply module 90 and the first switch circuit 20 to receive the DC power supplied by the power supply module 90. The non-inverting input terminal of the third comparator CMP3 is connected to the second terminal of the thirty-first resistor R31 and the first terminal of the thirty-second resistor R32, and the second terminal of the thirty-second resistor R32 is connected to the power supply ground. The inverting input terminal of the third comparator CMP3 forms the second input terminal of the third comparator circuit 62, which is connected to the fourth sampling circuit 61 to receive the fourth sampling signal. The output terminal of the third comparator CMP3 is connected to the first terminal of the thirty-third resistor R33. The second terminal of the thirty-third resistor R33 forms the output terminal of the third comparator circuit 62, which is connected to the third switch circuit 70 to output the fourth decision signal.

[0065] The third switching circuit 70 includes a fifth PMOS transistor P5, a sixth PMOS transistor P6, a fourth transistor Q4, a thirty-fourth resistor R34, and a thirty-fifth resistor R35. The drain of the fifth PMOS transistor P5 forms the input terminal of the third switching circuit 70, which is connected to the power supply module 90 to receive the DC power supplied by the power supply module 90. The drain of the sixth PMOS transistor P6 forms the output terminal of the third switching circuit 70, which is connected to the fourth decision circuit 60 to output the DC power supplied by the power supply module 90. The base of the fourth transistor Q4 and the... The first end of resistor R35 is connected to and together constitutes the control terminal of the third switching circuit 70, and is connected to the fourth decision circuit 60 to receive the fourth decision signal; the collector of the fourth transistor Q4 is connected to the gate of the fifth PMOS transistor P5, the gate of the sixth PMOS transistor P6 and the first end of resistor R34; the drain of the fifth PMOS transistor P5 is connected to the drain of the sixth PMOS transistor P6 and the second end of resistor R34; the emitter of the fourth transistor Q4 and the second end of resistor R35 are connected to the power supply ground.

[0066] It is understood that the DC microgrid networking circuit also includes a first fuse F1, a second fuse F2, and a third fuse F3; the first fuse F1 is connected between the second decision circuit 30 and the load 80; the second fuse F2 is connected between the third decision circuit 40 and the load 80; and the third fuse F3 is connected between the fourth decision circuit 60 and the grid bus.

[0067] The DC microgrid networking circuit also includes a capacitor assembly. The first end of the capacitor assembly is connected to the first switching circuit 20 and the second decision circuit 30, and the second end of the capacitor assembly is connected to the power supply ground. The capacitor assembly includes a fourth capacitor C4.

[0068] The filter unit 93 includes a common-mode inductor B1, a fifth capacitor C5, and a sixth capacitor C6.

[0069] The following is based on the working principle. Figure 10 Further explanation is provided below: Figure 10 The DC microgrid networking circuit shown has two operating states.

[0070] In the first operating state, the first resistor R1 and the second resistor R2 divide the DC power supplied by the power module 90 to output a first sampling signal. The first sampling signal is greater than the threshold of the first transistor Q1, so the first transistor Q1 is turned on and the first decision signal (low level) is disconnected from the collector of the first transistor Q1. The second transistor Q2 is turned off and a high level signal is output from the collector of the second transistor Q2 to turn off the first PMOS transistor P1 and the second PMOS transistor P2 and disconnect the DC power supplied by the grid bus. The second operational amplifier U2 amplifies the voltage across the fourteenth resistor R14 to output the third sampling signal to the inverting input of the second comparator CMP2. The twenty-first resistor R21 and the twenty-second resistor R22 divide the DC power supplied by the power module 90 to output the second reference voltage to the non-inverting input of the second comparator CMP2. When the third sampling signal is greater than the second reference voltage, the second comparator CMP2 outputs the third decision signal (low level), the third transistor Q3 is turned off, and a high-level signal is output from the collector of the third transistor Q3 to turn off the third PMOS transistor P3 and the fourth PMOS transistor P4 and disconnect the DC power supplied by the power module 90 to the load 80. When the third sampling signal is less than the second reference voltage, the second comparator CMP2 disconnects the second decision signal (high level), the third transistor Q3 is turned on, and a low-level signal is output from the collector of the third transistor Q3 to turn on the third PMOS transistor P3 and the fourth PMOS transistor P4 and transmit the DC power supplied by the power module 90 to the load 80. Similarly... The third operational amplifier U3 amplifies the voltage across the twenty-fifth resistor R25 to output the fourth sampling signal to the inverting input of the third comparator CMP3. The thirty-first resistor R31 and the thirty-second resistor R32 divide the DC power supplied by the power module 90 to output the third reference voltage to the non-inverting input of the second comparator CMP2. When the fourth sampling signal is greater than the third reference voltage, the second comparator CMP2 outputs the third decision signal (low level), the fourth transistor Q4 is turned off and outputs a high-level signal from the collector of the fourth transistor Q4 to turn off the fifth PMOS transistor P5 and the sixth PMOS transistor P6 and disconnect the DC power supplied by the power module 90 to the load 80. When the fourth sampling signal is less than the third reference voltage, the third comparator CMP3 disconnects the fourth decision signal (high level), the fourth transistor Q4 is turned on and outputs a low-level signal from the collector of the fourth transistor Q4 to turn on the fifth PMOS transistor P5 and the sixth PMOS transistor P6 and transmit the DC power supplied by the power module 90 to the grid bus.

[0071] In the second operating state, the first resistor R1 and the second resistor R2 divide the DC power supplied by the power module 90 to output a first sampling signal. The first sampling signal is less than the threshold of the first transistor Q1, so the first transistor Q1 is turned off and a first decision signal (high level) is output from the collector of the first transistor Q1. The second transistor Q2 is turned on and a low level signal is output from the collector of the second transistor Q2 to turn on the first PMOS transistor P1 and the second PMOS transistor P2 and transmit the DC power supplied by the grid bus to the load 80.

[0072] The first operational amplifier U1 amplifies the voltage across the fifth resistor R5 to output a second sampling signal to the inverting input of the first comparator CMP1. The eleventh resistor R11 and the twelfth resistor R12 divide the DC power supplied by the grid bus to output a first reference voltage to the non-inverting input of the first comparator CMP1. When the second sampling signal is greater than the first reference voltage, the first comparator CMP1 outputs a second decision signal (low level), the second transistor Q2 is turned off, and a high-level signal is output from the collector of the second transistor Q2 to turn off the first PMOS transistor P1 and the second PMOS transistor P2 and disconnect the DC power supplied by the grid bus to the load 80. When the second sampling signal is less than the first reference voltage, the first comparator CMP1 disconnects the second decision signal (high level), the second transistor Q2 is turned on, and a low-level signal is output from the collector of the second transistor Q2 to turn on the first PMOS transistor P1 and the second PMOS transistor P2 and transmit the DC power supplied by the grid bus to the load 80.

[0073] This invention also provides an electronic device that includes the aforementioned DC microgrid networking circuit.

[0074] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0075] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A DC microgrid networking circuit, characterized in that, It includes at least two parallel energy sub-circuits, which are connected to the power module and the load. Each energy sub-circuit includes a first decision circuit and a first switching circuit. The power module is connected to the grid bus and is used to provide DC power to the grid bus and the load. The first decision circuit, connected to the first switching circuit and the power module, is used to control the first switching circuit to open in response to the voltage of the supplied DC power being greater than a preset voltage, and to control the first switching circuit to open in response to the voltage of the supplied DC power being less than a preset voltage, so as to connect to the supplied DC power input from the grid-connected bus. The load is connected to the power module and is used to operate according to the DC power supplied by the power module or the DC power input from the grid bus. The first decision circuit includes: The first sampling circuit is connected to the power supply module and is used to sample the voltage of the DC power supplied by the power supply module in order to output a first sampling signal. A first driving circuit, connected to the first sampling circuit and the first switching circuit, is used to output a first decision signal in response to the first sampling signal being greater than a preset value, and to disconnect the output of the first decision signal in response to the first sampling signal being less than the preset value. The first switching circuit is used to transmit the DC power supply input from the grid-connected bus to supply power to the load in response to the first decision signal, and to disconnect the DC power supply input from the grid-connected bus in response to the disconnection of the first decision signal.

2. The DC microgrid networking circuit as described in claim 1, characterized in that, Also includes: The second decision circuit, connected to the power module, the load, and the first switching circuit, is used to control the first switching circuit to disconnect in response to the current of the DC power input to the grid bus being greater than a first preset current.

3. The DC microgrid networking circuit as described in claim 2, characterized in that, The second decision circuit includes: The second sampling circuit is connected to the load, the first switching circuit and the power module, and is used to sample the current of the DC power supplied by the grid-connected bus to output a second sampling signal. A first comparison circuit, connected to the second sampling circuit, is used to compare the second sampled signal with a first reference voltage to output a second decision signal; The first switching circuit is also used to disconnect the DC power supply input to the grid-connected bus in response to the second decision signal.

4. The DC microgrid networking circuit as described in claim 1, characterized in that, Also includes: The third decision circuit, connected to the load and the first switching circuit, is used to output a third decision signal in response to the current of the DC power supplied by the power module being greater than the second preset current. The second switching circuit, connected to the power supply module and the third decision circuit, is used to disconnect the DC power supply output from the power supply module to the load in response to the third decision signal.

5. The DC microgrid networking circuit as described in claim 4, characterized in that, The third decision circuit includes: The third sampling circuit, connected to the second switching circuit, is used to sample the current of the DC power supplied by the power module to output a third sampling signal. The second comparison circuit, connected to the third sampling circuit, is used to compare the third sampling signal with the second reference voltage to output a third decision signal; The second switching circuit is used to transmit the DC power supplied by the power module to the load in response to the third decision signal, and to disconnect the DC power supplied by the power module in response to the disconnection of the third decision signal.

6. The DC microgrid networking circuit as described in claim 1, characterized in that, Also includes: The fourth decision circuit, connected to the grid bus, is used to output a fourth decision signal in response to the current of the DC power supplied by the power module being greater than the third preset current. The third switching circuit is connected to the power supply module and the fourth decision circuit, and is used to disconnect the DC power supply output by the power supply module to the grid bus in response to the fourth decision signal.

7. The DC microgrid networking circuit as described in claim 6, characterized in that, The fourth decision circuit includes: The fourth sampling circuit, connected to the third switching circuit, is used to sample the current of the DC power supplied by the power module to output a fourth sampling signal. The third comparison circuit, connected to the fourth sampling circuit, is used to compare the fourth sampling signal with the third reference voltage to output a fourth decision signal; The third switching circuit is used to transmit the DC power supplied by the power module to the grid bus in response to the fourth decision signal, and to disconnect the DC power supplied by the power module in response to the disconnection of the fourth decision signal.

8. The DC microgrid networking circuit as described in any one of claims 1 to 7, characterized in that, The power module includes: Photovoltaic units are used for photovoltaic power generation to provide photovoltaic voltage; An energy storage unit, connected to the photovoltaic unit, is used to charge the photovoltaic unit based on the photovoltaic voltage to output an energy storage voltage; The filtering unit, connected to the energy storage unit, the photovoltaic unit, and the first switching circuit, is used to filter and suppress the energy storage voltage to output the DC power supply.

9. An electronic device, characterized in that, The electronic device includes the DC microgrid networking circuit as described in any one of claims 1 to 8.

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