A starting circuit of an energy storage inverter and an energy storage inverter
By separating the soft-start circuit of the diesel generator interface from the grid-side auxiliary power in the energy storage inverter and using the grid-side transformer for isolation, the insulation safety problem is solved, the circuit design is simplified, the cost and control complexity are reduced, and the reliability and stability of the system are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 深圳迈格瑞能技术有限公司
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-10
AI Technical Summary
In existing energy storage inverters, the starting design of diesel generators and grid side has insulation safety issues. In particular, the contact gap of the self-closing relay cannot meet the safety requirements, and the traditional solution is complicated, which increases the design cost and control difficulty.
The soft starter circuit using the diesel generator interface is separated from the grid-side auxiliary power supply. Isolation is achieved using a grid-side transformer. The design uses a rectifier bridge and a unidirectional switching transistor to ensure insulation safety and simplify circuit design.
This technology achieves insulation safety for energy storage inverters at the grid port, reduces costs and design complexity, improves system reliability and stability, simplifies control logic, reduces hardware and maintenance costs, and enhances space utilization.
Smart Images
Figure CN224481632U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of energy storage inverter technology, and in particular to a start-up circuit and an energy storage inverter. Background Technology
[0002] Currently, energy storage inverters that use diesel generators and grid power typically connect to a shared flyback power supply (i.e., AC-side flyback auxiliary power supply) via double-pole double-throw (2 normally open and 2 normally closed) relays on both the diesel generator and grid sides. This allows the AC input from either the diesel generator or grid side to pass through the rectifier bridge and transformer in the flyback power supply and then power the main and auxiliary power supplies. Once the main and auxiliary power supplies are operational, they can provide power to the entire unit, enabling the machine to start and operate.
[0003] This design approach involves the diesel generator and the grid port sharing a single flyback power supply, utilizing the characteristics of a self-closing relay to solve the problem of drawing power from whichever port is energized. However, this solution has a drawback: safety regulations require that equipment connected to the grid port meet basic insulation requirements. Specifically, when the grid port is de-energized, the safety distance between the relay contacts of the diesel generator and the grid must meet a 3mm requirement. The contact gap of a self-closing relay is typically as small as 0.8mm, which cannot meet this safety requirement.
[0004] The above content is only used to help understand the technical solution of this utility model and does not represent an admission that the above content is prior art. Utility Model Content
[0005] This utility model proposes a startup circuit and an energy storage inverter, aiming to optimize the startup design of the diesel generator and grid side in the energy storage inverter to ensure the insulation safety of the energy storage inverter.
[0006] To achieve the above objectives, this utility model proposes a starting circuit for an energy storage inverter, comprising: an inverter module, main and auxiliary power supplies, a diesel generator port connected to a diesel generator, a diesel generator soft start circuit, a grid port, a grid-side flyback power supply, and a first switching transistor; wherein, the diesel generator soft start circuit comprises a first resistor, a second switching transistor, and a first rectifier bridge;
[0007] The positive terminal of the inverter module's system bus is electrically connected to the output terminal of the main and auxiliary power supply, and the negative terminal of the inverter module's system bus is electrically connected to the input terminal of the main and auxiliary power supply via the first switching transistor. The conduction direction of the first switching transistor is from the inverter module to the main and auxiliary power supply.
[0008] The first resistor is connected between the live wire of the diesel generator port and one AC terminal of the first rectifier bridge. The other AC terminal of the first rectifier bridge is electrically connected to the neutral wire of the diesel generator port. The negative DC terminal of the first rectifier bridge is electrically connected to the output terminal of the main and auxiliary power supply. The positive DC terminal of the first rectifier bridge is electrically connected to the input terminal of the main and auxiliary power supply via the second switch. The conduction direction of the second switch is from the diesel generator soft start circuit to the main and auxiliary power supply.
[0009] The grid port is connected to the main and auxiliary power supplies via the grid-side flyback power supply.
[0010] Optionally, the grid-side flyback power supply includes a second resistor, a third switching transistor, a second rectifier bridge, and a transformer;
[0011] The second resistor is connected between the live wire of the power grid port and one AC terminal of the second rectifier bridge. The other AC terminal of the second rectifier bridge is electrically connected to the neutral wire of the power grid port. The DC positive / negative terminals of the second rectifier bridge are electrically connected to the input positive / negative terminals of the transformer. The output negative terminal of the transformer is electrically connected to the output terminal of the main and auxiliary power supply. The output positive terminal of the transformer is electrically connected to the input terminal of the main and auxiliary power supply via the third switch. The conduction direction of the third switch is from the flyback power supply on the power grid side to the main and auxiliary power supply.
[0012] Optionally, the third switching transistor is a diode.
[0013] Optionally, the first switching transistor and / or the second switching transistor may be a diode.
[0014] Optionally, the AC side of the inverter module is electrically connected to the diesel generator port via the first switch module.
[0015] Optionally, the AC side of the inverter module is electrically connected to the grid port via a second switch module.
[0016] This utility model further proposes an energy storage inverter, including the start-up circuit of the energy storage inverter as described above.
[0017] The beneficial effects of this utility model's technical solution are as follows: By separating the soft-start circuit of the diesel generator interface from the grid-side auxiliary power and using a grid-side transformer for isolation, the problem of contact gaps not meeting safety regulations when using relay solutions is avoided, ensuring the insulation safety of the energy storage inverter at the grid port. Furthermore, since the diesel generator interface does not involve power outage maintenance, it directly adopts a rectifier bridge + unidirectional switching transistor scheme, eliminating the need for complex transformer isolation design, making the circuit simpler and more effective, and reducing cost and design complexity. It also solves the problem of not requiring control signals during soft-start when the energy storage inverter is powered only by mains or diesel generator, improving the system's reliability and stability. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the start-up circuit of the energy storage inverter of this utility model.
[0019] Explanation of reference numerals in the attached figures:
[0020] Wherein, R1 is the first resistor, R2 is the second resistor, D1 is the first switching transistor, D2 is the second switching transistor, D3 is the third switching transistor, Z1 is the first rectifier bridge, Z2 is the second rectifier bridge, L is the live wire, N is the neutral wire, BUS+ is the positive terminal of the system bus, BUS- is the negative terminal of the system bus, K1 is the first switching module, and K2 is the second switching module.
[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0022] The solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.
[0024] It should also be noted that when a component is described as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is described as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.
[0025] Furthermore, descriptions involving terms such as "first" and "second" in this utility model are for descriptive purposes only (e.g., to distinguish identical or similar elements) and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" and "second" may explicitly or implicitly include at least one of those features. Additionally, technical solutions from different embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, such a combination should be considered nonexistent and not within the scope of protection claimed by this utility model.
[0026] This utility model proposes a startup circuit for an energy storage inverter, referring to... Figure 1In this circuit, R1 is the first resistor, R2 is the second resistor, D1 is the first switching transistor, D2 is the second switching transistor, D3 is the third switching transistor, Z1 is the first rectifier bridge, Z2 is the second rectifier bridge, L is the live wire, N is the neutral wire, BUS+ is the positive terminal of the system bus, BUS- is the negative terminal of the system bus, K1 is the first switching module, and K2 is the second switching module. The technical solution provided by the embodiments of this invention will be described in detail below.
[0027] Reference Figure 1 The starting circuit of the energy storage inverter includes: an inverter module, main and auxiliary power supplies, a diesel generator port connected to the diesel generator, a diesel generator soft start circuit, a grid port, a grid-side flyback power supply, and a first switching transistor; wherein, the diesel generator soft start circuit includes a first resistor, a second switching transistor, and a first rectifier bridge;
[0028] The positive terminal of the inverter module's system bus is electrically connected to the output terminal of the main and auxiliary power supply, and the negative terminal of the inverter module's system bus is electrically connected to the input terminal of the main and auxiliary power supply via the first switching transistor. The conduction direction of the first switching transistor is from the inverter module to the main and auxiliary power supply.
[0029] The first resistor is connected between the live wire of the diesel generator port and one AC terminal of the first rectifier bridge. The other AC terminal of the first rectifier bridge is electrically connected to the neutral wire of the diesel generator port. The negative DC terminal of the first rectifier bridge is electrically connected to the output terminal of the main and auxiliary power supply. The positive DC terminal of the first rectifier bridge is electrically connected to the input terminal of the main and auxiliary power supply via the second switch. The conduction direction of the second switch is from the diesel generator soft start circuit to the main and auxiliary power supply.
[0030] The grid port is connected to the main and auxiliary power supplies via the grid-side flyback power supply.
[0031] In this embodiment, the core objective of the starting circuit is to obtain electrical energy from both the grid and the diesel generator under different conditions of grid power availability and grid depletion, respectively, to power the main and auxiliary power supplies of the energy storage inverter, thereby driving the entire unit to operate, while simultaneously addressing the safety issues present in traditional solutions. The circuit mainly consists of an inverter module, main and auxiliary power supplies, a diesel generator port and related soft-start circuits, a grid port and a grid-side flyback power supply, as well as some switching transistors and resistors.
[0032] Among them, the inverter module, as the key part of the entire energy storage inverter system, is responsible for converting DC power to AC power or AC power to DC power, so as to realize the rational distribution and utilization of electrical energy; the main and auxiliary power supplies provide stable power to the main unit and other auxiliary equipment to ensure the normal operation of the whole machine.
[0033] The positive terminal of the inverter module's system bus is directly connected to the output terminal of the main and auxiliary power supplies, while the negative terminal of the system bus is connected to the input terminal of the main and auxiliary power supplies via the first switching transistor. Here, the conduction direction of the first switching transistor is set from the inverter module to the main and auxiliary power supplies. Its function is to prevent current from flowing in reverse, protect the main and auxiliary power supplies and the inverter module, and ensure that the current can only flow from the inverter module to the main and auxiliary power supplies in a predetermined direction.
[0034] The diesel generator port is the interface for connecting the diesel generator to the circuit, used to introduce the AC power generated by the diesel generator. The first resistor in the diesel generator soft start circuit is connected between the live wire of the diesel generator port and one AC terminal of the first rectifier bridge. Its main function is to limit the current when the diesel generator starts, to prevent excessive current surges from damaging subsequent circuit components, and to play a buffering and protective role.
[0035] The first rectifier bridge of the diesel generator soft-start circuit has two AC terminals and two DC terminals. One AC terminal is connected to the live wire of the diesel generator port through the first resistor, and the other AC terminal is directly connected to the neutral wire of the diesel generator port, responsible for converting the AC power output from the diesel generator into DC power. The negative DC terminal of the first rectifier bridge is connected to the output terminal of the main and auxiliary power supply, while the positive DC terminal is connected to the input terminal of the main and auxiliary power supply through the second switching transistor.
[0036] The second switch is turned on from the diesel generator soft starter circuit to the main and auxiliary power supply, which serves to prevent reverse current from flowing back to the diesel generator soft starter circuit and ensure that the current can only flow from the diesel generator through the diesel generator soft starter circuit to the main and auxiliary power supply.
[0037] The grid port is used to connect AC power to the power grid and is the entry point for grid power into the circuit. The grid-side flyback power supply connects the grid port and the main and auxiliary power supplies, and mainly consists of a rectifier bridge and a transformer. The AC power from the grid port first enters the grid-side flyback power supply, is rectified by the rectifier bridge to convert AC to DC, and then undergoes isolation and voltage transformation by the transformer before finally delivering the qualified power to the main and auxiliary power supplies. The transformer's isolation function effectively meets the basic insulation requirements for equipment connected to the grid port as stipulated in safety regulations.
[0038] When the power grid is supplying power normally, electrical energy is input to the grid port. The grid energy is first rectified by the rectifier bridge in the grid-side flyback power supply, converting alternating current (AC) to direct current (DC). Then, through the isolation function of the transformer, the electrical energy is safely delivered to the main and auxiliary power supplies. After receiving power, the main and auxiliary power supplies begin operation, providing power to the entire unit and enabling the energy storage inverter to operate normally. Throughout this process, the transformer in the grid-side flyback power supply acts as an isolation element, ensuring that the basic insulation requirements for equipment connected to the grid port are met according to safety regulations.
[0039] When the power grid fails, the diesel generator is started. Energy flows from the generator port. The specific path is as follows: energy first passes through the first resistor in the generator's soft-start circuit, which limits current and protects circuit components. Next, the energy is rectified by the first rectifier bridge, converting the alternating current (AC) output from the generator into direct current (DC). The rectified DC then flows through the second switch to the main and auxiliary power supplies, providing them with power and enabling the generator to continue operating. Since the generator port is not a common terminal, there is no issue of power outage maintenance. Therefore, the system bus voltage (system bus positive / negative (BUS+ / BUS-)) to the generator port only needs to meet basic operational insulation requirements. Thus, a simple scheme using a rectifier bridge and a unidirectional switch can achieve energy transfer without the need for transformer isolation required for grid-side auxiliary power.
[0040] In one embodiment, by separating the soft-start circuit of the diesel generator interface from the grid-side auxiliary power supply and using a grid-side transformer for isolation, the problem of contact gaps not meeting safety requirements when using relay solutions is avoided, ensuring the insulation safety of the energy storage inverter at the grid port. Furthermore, since the diesel generator interface does not involve power outage maintenance, a rectifier bridge + unidirectional switch solution is directly adopted, eliminating the need for complex transformer isolation design, making the circuit simpler and more efficient, reducing cost and design complexity. It also solves the problem of not requiring control signals during soft-start when the energy storage inverter is powered only by mains or diesel generator, improving the system's reliability and stability.
[0041] In this way, the soft-start circuits of the power grid and the diesel generator can achieve power supply functions independently without the need for an additional DSP (Digital Signal Processor) controller. This feature greatly simplifies the control logic and structure of the circuit. In some traditional circuit designs, complex DSP controllers are often required to coordinate the switching and power supply process between different power sources (such as the power grid and the diesel generator), which not only increases hardware costs but also requires complex programming and debugging work. However, the starting circuit of this energy storage inverter cleverly achieves autonomous power supply through its own circuit design, reducing the system's dependence on complex external control equipment and improving the system's autonomy and reliability.
[0042] When the power grid fails and only the diesel generator provides power, the circuit between the diesel generator's soft starter circuit and the power grid port strictly meets safety regulations. In practical applications, workers may perform maintenance on relevant parts of the power grid during a power outage. Traditional solutions may pose a risk of leakage due to issues such as relay contact gaps, threatening the personal safety of maintenance workers. This solution, through a reasonable circuit layout and design, ensures insulation and a safe distance between the diesel generator circuit and the power grid port under these conditions, effectively preventing electric shock accidents during maintenance and providing reliable protection for personnel safety and stable equipment operation.
[0043] This energy storage inverter features a simple startup circuit design, offering advantages in both cost and space. From a cost perspective, the simplified circuitry reduces the number of electronic components required, lowering not only component procurement costs but also circuit board manufacturing and subsequent maintenance costs. In terms of space utilization, the simple circuit structure eliminates the need for extensive wiring and complex module layouts, saving significant space. This is crucial for space-constrained applications such as small server rooms and mobile energy storage devices, allowing for more compact designs and improved space utilization and integration.
[0044] In one embodiment, based on the above embodiments, the grid-side flyback power supply includes a second resistor, a third switch, a second rectifier bridge, and a transformer;
[0045] The second resistor is connected between the live wire of the power grid port and one AC terminal of the second rectifier bridge. The other AC terminal of the second rectifier bridge is electrically connected to the neutral wire of the power grid port. The DC positive / negative terminals of the second rectifier bridge are electrically connected to the input positive / negative terminals of the transformer. The output negative terminal of the transformer is electrically connected to the output terminal of the main and auxiliary power supply. The output positive terminal of the transformer is electrically connected to the input terminal of the main and auxiliary power supply via the third switch. The conduction direction of the third switch is from the flyback power supply on the power grid side to the main and auxiliary power supply.
[0046] In this embodiment, in the grid-side flyback power supply that is electrically connected to the grid port, the second resistor is connected between the live wire of the grid port and one AC terminal of the second rectifier bridge, which plays a certain role in limiting and buffering the incoming grid current; one AC terminal of the second rectifier bridge is connected to the live wire of the grid port through the second resistor, and the other AC terminal is connected to the neutral wire of the grid port, converting the AC power input from the grid into DC power, and the positive and negative DC terminals are electrically connected to the positive and negative input terminals of the transformer, respectively.
[0047] Simultaneously, the transformer receives the DC power output from the second rectifier bridge, isolates and transforms it. The negative output terminal of the transformer is electrically connected to the output terminal of the main and auxiliary power supply, while the positive output terminal is electrically connected to the input terminal of the main and auxiliary power supply via the third switching transistor. The isolation function of the transformer ensures that the insulation requirements of safety regulations are met between the power grid side and the main and auxiliary power supply.
[0048] The third switch is turned on in the direction from the grid-side flyback power supply to the main and auxiliary power supplies, preventing the current from the main and auxiliary power supplies from flowing in reverse to the grid-side flyback power supply.
[0049] When the power grid is energized: AC power from the power grid enters through the grid port, is current-limited by the second resistor, rectified into DC power by the second rectifier bridge, and then isolated and transformed by the transformer before being supplied to the main and auxiliary power supplies through the third switch, enabling the whole machine to operate normally.
[0050] When the power grid is down: Start the diesel generator. Its AC power enters from the diesel generator port, is current-limited by the first resistor, rectified by the first rectifier bridge, and then supplies power to the main and auxiliary power supplies through the second switching transistor to maintain the operation of the whole machine.
[0051] This ensures that the entire energy storage inverter startup circuit can operate stably and safely under different power supply conditions.
[0052] In one embodiment, based on the above embodiment, the third switching transistor is a diode, with its anode connected to the positive output terminal of the transformer and its cathode connected to the input terminal of the main and auxiliary power supplies. The diode has unidirectional conduction characteristics, with the conduction direction from the grid-side flyback power supply to the main and auxiliary power supplies, preventing the current from flowing back from the main and auxiliary power supplies to the grid-side flyback power supply, thus ensuring unidirectional current flow.
[0053] Optionally, the first switching transistor and / or the second switching transistor may be a diode.
[0054] Optionally, if the first switching transistor is a diode, its anode is connected to the negative terminal of the system bus of the inverter module, and its cathode is connected to the input terminal of the main and auxiliary power supplies. The unidirectional conduction characteristic of the diode ensures that current can only flow from the inverter module to the main and auxiliary power supplies, preventing reverse current flow from damaging circuit components.
[0055] Optionally, if the second switching transistor is a diode: the positive DC terminal of the first rectifier bridge is connected to the anode of the diode, and the cathode of the diode is connected to the input terminal of the main and auxiliary power supplies. This connection method ensures that current can only flow from the diesel generator soft-start circuit to the main and auxiliary power supplies, preventing the current from the main and auxiliary power supplies from flowing back to the diesel generator soft-start circuit. The negative DC terminal of the first rectifier bridge is electrically connected to the output terminal of the main and auxiliary power supplies.
[0056] In one embodiment, based on the above embodiments, referring to Figure 1 The AC side of the inverter module is electrically connected to the diesel generator port via the first switch module.
[0057] In this embodiment, the first switch module is connected between the AC side of the inverter module and the diesel generator port, and it controls the on / off switching of power transmission between the inverter module and the diesel generator. By controlling the first switch module, different operating modes can be switched.
[0058] When the power grid is supplying power normally, the AC power from the grid enters through the grid port, is processed by the grid-side flyback power supply, and then supplies power to the main and auxiliary systems, enabling the entire unit to operate normally. At this time, the first switching module is usually in the open state, and there is no power transmission between the AC side of the inverter module and the diesel generator port. The inverter module may be in standby mode, or it may perform power conversion according to system needs, but it does not interact with the diesel generator.
[0059] When the power grid fails and the diesel generator supplies power, the diesel generator is started, and its output AC power enters through the generator port. The generator's soft-start circuit processes the AC power and supplies it to both main and auxiliary power. At this time, if the system requires the inverter module to work in conjunction with the diesel generator, closing the first switch module allows a portion of the AC power output from the diesel generator to be directly supplied to the load, while the other portion undergoes further power processing through the inverter module, such as adjusting voltage and frequency, to meet the needs of different loads.
[0060] When the inverter module has an independent DC power input (such as a battery) and needs to supply power to the load, if the first switch module is closed, the inverter module can convert DC power into AC power, supplying part to the load and transmitting the other part to the relevant circuit of the diesel generator through the diesel generator port (if there is a corresponding energy feedback or coordinated control requirement).
[0061] In one embodiment, by controlling the on / off state of the first switching module, the power transfer between the inverter module and the diesel generator can be flexibly controlled, enabling switching between different operating modes and improving the system's flexibility and adaptability. In certain abnormal situations, such as diesel generator failure or inverter module failure, the first switching module can be quickly disconnected, severing the electrical connection between the two, preventing the fault from escalating, and protecting the circuit components and equipment. This enriches the functionality and operating modes of the energy storage inverter's startup circuit, improves the system's reliability and flexibility, and allows it to better adapt to different application scenarios and power supply conditions.
[0062] In one embodiment, based on the above embodiments, referring to Figure 1 The AC side of the inverter module is electrically connected to the grid port via the second switch module.
[0063] In this embodiment, the second switch module is connected between the AC side of the inverter module and the grid port, and is responsible for controlling the on / off of power transmission between the inverter module and the grid.
[0064] When the power grid is supplying power normally, the AC power from the grid enters through the grid port, is processed by the grid-side flyback power supply, and then supplies power to the main and auxiliary power sources, enabling the entire unit to operate normally. At this time, if the system needs the inverter module to feed power back to the grid (for example, when the energy storage battery is fully charged), the second switch module is closed, and the inverter module converts the DC power into AC power, which is then transmitted to the grid through the second switch module.
[0065] When the power grid fails and the diesel generator supplies power, the diesel generator starts, and its output AC power enters from the generator port. After being processed by the generator's soft-start circuit, it supplies power to both the main and auxiliary systems. If the system requires the inverter module to work in conjunction with the diesel generator, the first switch module is closed. Part of the AC power output from the diesel generator is directly supplied to the load, while the other part can be further processed by the inverter module. At this time, the second switch module is open, and the inverter module is not connected to the power grid.
[0066] When the inverter module has an independent DC power input (such as an energy storage battery), it can operate according to load demand and power supply conditions. If the first switch module is closed, the inverter module can work with the diesel generator to supply power to the load; if the second switch module is closed, the inverter module can feed power back to the grid or obtain power from the grid for charging (such as when the battery is low).
[0067] In one embodiment, the second switching module enables bidirectional flow of electrical energy between the inverter module and the power grid. When the grid supply is sufficient, the inverter module can feed excess electrical energy back to the grid, achieving efficient energy utilization; when the grid experiences a power outage or insufficient supply, the inverter module can obtain electrical energy from other power sources (such as diesel generators or energy storage batteries) to maintain system operation.
[0068] When a fault occurs in the power grid (such as a short circuit or overvoltage) or the inverter module malfunctions, the second switch module can be quickly disconnected to achieve electrical isolation between the inverter module and the power grid, prevent the fault from escalating, and protect the safety of equipment and personnel.
[0069] By controlling the on / off state of the second switching module, the connection status between the inverter module and the grid can be flexibly adjusted, enabling the energy storage system to better adapt to different power demands and power supply conditions, thereby improving the overall performance and reliability of the system.
[0070] This further enhances the functionality and flexibility of the energy storage inverter's startup circuit, enabling the system to achieve efficient and safe power conversion and transmission between various power sources.
[0071] This utility model further proposes an energy storage inverter, which includes the start-up circuit of the energy storage inverter described in the above embodiments. The specific structure of the start-up circuit of the energy storage inverter is as described in the above embodiments. Since this energy storage inverter adopts all the technical solutions of all the above embodiments, it has at least all the technical effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.
[0072] The above description is only a part or preferred embodiment of this utility model. Neither the text nor the drawings should limit the scope of protection of this utility model. All equivalent structural transformations made using the content of this utility model specification and drawings under the overall concept of this utility model, or direct / indirect applications in other related technical fields, are included within the scope of protection of this utility model.
Claims
1. A startup circuit for an energy storage inverter, characterized in that, include: The system includes an inverter module, main and auxiliary power supplies, a diesel generator port connected to the diesel generator, a diesel generator soft start circuit, a grid port, a grid-side flyback power supply, and a first switching transistor; wherein, the diesel generator soft start circuit includes a first resistor, a second switching transistor, and a first rectifier bridge. The positive terminal of the inverter module's system bus is electrically connected to the output terminal of the main and auxiliary power supply, and the negative terminal of the inverter module's system bus is electrically connected to the input terminal of the main and auxiliary power supply via the first switching transistor. The conduction direction of the first switching transistor is from the inverter module to the main and auxiliary power supply. The first resistor is connected between the live wire of the diesel generator port and one AC terminal of the first rectifier bridge. The other AC terminal of the first rectifier bridge is electrically connected to the neutral wire of the diesel generator port. The negative DC terminal of the first rectifier bridge is electrically connected to the output terminal of the main and auxiliary power supply. The positive DC terminal of the first rectifier bridge is electrically connected to the input terminal of the main and auxiliary power supply via the second switch. The conduction direction of the second switch is from the diesel generator soft start circuit to the main and auxiliary power supply. The grid port is connected to the main and auxiliary power supplies via the grid-side flyback power supply.
2. The starting circuit of the energy storage inverter as described in claim 1, characterized in that, The grid-side flyback power supply includes a second resistor, a third switching transistor, a second rectifier bridge, and a transformer; The second resistor is connected between the live wire of the power grid port and one AC terminal of the second rectifier bridge. The other AC terminal of the second rectifier bridge is electrically connected to the neutral wire of the power grid port. The DC positive / negative terminals of the second rectifier bridge are electrically connected to the input positive / negative terminals of the transformer. The output negative terminal of the transformer is electrically connected to the output terminal of the main and auxiliary power supply. The output positive terminal of the transformer is electrically connected to the input terminal of the main and auxiliary power supply via the third switch. The conduction direction of the third switch is from the flyback power supply on the power grid side to the main and auxiliary power supply.
3. The starting circuit of the energy storage inverter as described in claim 2, characterized in that, The third switching transistor is a diode.
4. The starting circuit of the energy storage inverter as described in claim 1, characterized in that, The first switching transistor and / or the second switching transistor are diodes.
5. The starting circuit of the energy storage inverter as described in claim 1, characterized in that, The AC side of the inverter module is electrically connected to the diesel generator port via the first switch module.
6. The starting circuit of the energy storage inverter as described in claim 1, characterized in that, The AC side of the inverter module is electrically connected to the grid port via the second switch module.
7. An energy storage inverter, characterized in that, Includes the start-up circuit of the energy storage inverter as described in any one of claims 1-6.