Energy storage inverter, control method and energy storage inverter system

Abstract

The invention discloses an energy storage inverter, a control method and an energy storage inverter system, and the energy storage inverter comprises an AC power supply branch which receives an AC power supply signal and outputs a first power supply signal; the energy storage power supply branch is connected with an energy storage power supply, receives an energy storage power supply signal and outputs a second power supply signal; the photovoltaic power supply branch is connected with a photovoltaic power supply and outputs a fourth power supply signal according to the first power supply signal, the second power supply signal and / or a third power supply signal output by the photovoltaic power supply; the isolation power supply circuit outputs a fifth power supply signal to the main control circuit; the main control circuit controls at least one of the alternating current power supply branch, the photovoltaic power supply branch and the energy storage power supply branch to be in a working state according to the first power supply signal, the second power supply signal and the fourth power supply signal, and selects part of power supply branches from the alternating current power supply branch, the photovoltaic power supply branch and the energy storage power supply branch to enter the working state through the main control circuit; and other power supply branches enter a non-working state, so that the energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an energy storage inverter, a control method and an energy storage inverter system. Background Art

[0002] With the continuous advancement of energy storage technology, energy storage inverters, as an important component of energy storage systems, are becoming more and more widely used. Energy storage inverters can not only achieve efficient conversion between DC and AC, but also improve energy utilization efficiency by optimizing energy management. However, the power consumption of energy storage inverters in standby mode has always been an important problem that has plagued the industry.

[0003] The standby power consumption of energy storage inverters mainly comes from the continuous operation of inverter control circuits, communication modules, power management units and other auxiliary circuits. When these modules are in standby mode, even if there is no actual power conversion or load output, their internal components still need to maintain a certain operating current, resulting in continuous energy consumption. In addition, in order to quickly respond to user needs, many energy storage inverters often use high-performance control chips and communication modules, which further increases standby power consumption.

[0004] Currently, in order to reduce standby power consumption, some manufacturers try to achieve this by optimizing hardware design, improving power management strategies, or using low-power components. However, these methods still have the following shortcomings in practical applications: Limited hardware design optimization: The improvement of hardware circuits requires a trade-off between performance and power consumption. It is difficult to significantly reduce standby power consumption by relying solely on hardware optimization. Complex power management strategies: Complex power management strategies may lead to longer response times in actual operation, thereby affecting user experience. Limitations of low-power components: Although low-power components can reduce power consumption to a certain extent, their performance and cost often cannot meet system requirements at the same time. Therefore, how to effectively reduce standby power consumption while ensuring the performance of energy storage inverters has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The embodiments of the present invention provide an energy storage inverter, a control method and an energy storage inverter system to solve the problem of high standby power consumption of the existing energy storage inverter.

[0006] An energy storage inverter comprises an AC power supply branch, a photovoltaic power supply branch, an energy storage power supply branch, an isolation power supply circuit and a main control circuit; The AC power supply branch is used to connect to the AC power supply, receive the AC power supply signal output by the AC power supply, and output a first power supply signal; The energy storage power supply branch is used to connect to the energy storage power supply source, receive the energy storage power supply signal output by the energy storage power supply source, and output a second power supply signal; The photovoltaic power supply branch is used to connect to a photovoltaic power supply source, and is connected to the AC power supply branch and the energy storage power supply branch, and is used to output a fourth power supply signal according to the first power supply signal, the second power supply signal, and / or the third power supply signal output by the photovoltaic power supply source; The isolation power supply circuit is connected to the AC power supply branch, the photovoltaic power supply branch, and the main control circuit, and is used to output a fifth power supply signal to the main control circuit according to the first power supply signal and / or the fourth power supply signal; The main control circuit is connected to the AC power supply branch, the photovoltaic power supply branch, and the energy storage power supply branch, and is used to control at least one of the AC power supply branch, the photovoltaic power supply branch, and the energy storage power supply branch to be in a working state according to the first power supply signal, the second power supply signal, and the fourth power supply signal.

[0007] Further, a switching power supply circuit and a switching control circuit are provided in each of the AC power supply branch, the photovoltaic power supply branch, and the energy storage power supply branch; The switching control circuit is connected to the switching power supply circuit and the main control circuit, and is used to control the switching power supply circuit to enter a non-working state according to the first control signal of the main control circuit, and control the switching power supply circuit to enter a working state according to the second control signal of the main control circuit.

[0008] Further, the AC power supply branch further includes a rectification circuit; The rectification circuit is connected to the AC power supply source, and is used to receive the AC power supply signal output by the AC power supply source and output a first DC signal; The switching power supply circuit is connected to the rectification circuit, and is used to output a first power supply signal according to the first DC signal.

[0009] Further, the switching power supply circuit includes a flyback circuit or a Buck circuit.

[0010] Further, the switching control circuit includes a disconnector circuit and a pulse width modulation control chip; The pulse width adjustment control chip is connected to the switching power supply circuit, and is used to control the switching power supply circuit to work in a working state; The disconnector circuit is connected to the main control circuit and the pulse width modulation control chip, and is used to control the pulse width modulation control chip to enter a non-working state according to the first control signal; and control the pulse width modulation control chip to enter a working state according to the second control signal.

[0011] Further, the disconnect switch circuit includes a first switching transistor and an isolation relay; the isolation relay includes a coil, a first normally-closed contact, and a second normally-closed contact connected to the first normally-closed contact; The first switching transistor and the coil are connected in series between a first power supply terminal and ground, and the control terminal of the first switching transistor is connected to the main control circuit; The first normally-closed contact is connected to a second power supply terminal, and the second normally-closed contact is connected to the pulse width modulation control chip.

[0012] Further, the disconnect switch circuit includes an isolation optocoupler; the isolation optocoupler includes a light-emitting diode and a phototransistor; The anode of the light-emitting diode is connected to the main control circuit, and the cathode of the light-emitting diode is grounded; The first end of the phototransistor is connected to the pulse width modulation control chip, and the second end of the phototransistor is grounded.

[0013] A control method for an energy storage inverter, applied to the above-mentioned main control circuit, includes: If the current working mode is the emergency power supply mode, then control the AC power supply branch, the photovoltaic power supply branch, and the energy storage power supply branch to be in a working state; If the current working mode is a non-emergency working mode, then obtain a second power supply signal output by the energy storage power supply branch and a fourth power supply signal output by the photovoltaic power supply branch, and respectively determine whether the energy storage power supply or the photovoltaic power supply meets a preset power supply condition according to the second power supply signal and the fourth power supply signal; If the photovoltaic power supply meets the preset power supply condition, then control the photovoltaic power supply branch to be in a working state, and control the AC power supply branch and the energy storage power supply branch to be in a non-working state; If the photovoltaic power supply does not meet the preset power supply condition and the energy storage power supply meets the preset power supply condition, then control the photovoltaic power supply branch and the energy storage power supply branch to be in a working state, and control the AC power supply branch to be in a non-working state; If neither the energy storage power supply nor the photovoltaic power supply meets the preset power supply condition, then control the AC power supply branch to be in a working state, and control the photovoltaic power supply branch to be in a working state according to a preset periodic interval.

[0014] An energy storage inverter system includes an AC power supply, an energy storage power supply, a photovoltaic power supply, and the above-mentioned energy storage inverter; The energy storage inverter is used to connect a load and is connected to the AC power supply, the energy storage power supply, and the photovoltaic power supply.

[0015] Further, the AC power supply includes a mains power grid and / or an AC generator.

[0016] Embodiments of the present invention provide an energy storage inverter, a control method and an energy storage inverter system. The energy storage inverter includes an AC power supply branch, a photovoltaic power supply branch, an energy storage power supply branch, an isolation power supply circuit and a main control circuit. The AC power supply branch is used to connect to an AC power supply, receive an AC power supply signal output by the AC power supply, and output a first power supply signal. The energy storage power supply branch is used to connect to an energy storage power supply, receive an energy storage power supply signal output by the energy storage power supply, and output a second power supply signal. The photovoltaic power supply branch is used to connect to a photovoltaic power supply, and is connected to the AC power supply branch and the energy storage power supply branch, and is used to output a fourth power supply signal according to the first power supply signal, the second power supply signal and / or a third power supply signal output by the photovoltaic power supply. The isolation power supply circuit is connected to the AC power supply branch, the photovoltaic power supply branch and the main control circuit, and is used to output a fifth power supply signal to the main control circuit according to the first power supply signal and / or the fourth power supply signal, so that the energy storage inverter can adapt to multiple power supplies. The main control circuit is connected to the AC power supply branch, the photovoltaic power supply branch and the energy storage power supply branch, and is used to control at least one of the AC power supply branch, the photovoltaic power supply branch and the energy storage power supply branch to be in a working state according to the first power supply signal, the second power supply signal and the fourth power supply signal, so as to maintain the operation of the main control circuit through the isolation power supply circuit, so that the main control circuit can select some power supply branches from the AC power supply branch, the photovoltaic power supply branch and the energy storage power supply branch to enter the working state, and other power supply branches enter the non-working state, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0018] Figure 1 is a schematic diagram of an energy storage inverter in an embodiment of the present invention; Figure 2 is a schematic diagram of a switch control circuit in an embodiment of the present invention; Figure 3 is another schematic diagram of a switch control circuit in an embodiment of the present invention; Figure 4 is a flowchart of a control method of an energy storage inverter in an embodiment of the present invention.

[0019] In the figure: 1. AC power supply; 2. Energy storage power supply; 3. Photovoltaic power supply; 4. Energy storage inverter; 41. AC power supply branch; 411. Rectifier circuit; 42. Photovoltaic power supply branch; 43. Energy storage power supply branch; 44. Isolated power supply circuit; 441. First isolated power supply; 442. Second isolated power supply; 45. Main control circuit; 51. Disconnector circuit; 52. Pulse width modulation control chip. Detailed implementation mode

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0021] It should be understood that the present invention can be implemented in different forms and should not be construed as limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout the drawings.

[0022] It should be understood that when an element or layer is referred to as "on", "adjacent to", "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected or coupled to the other element or layer, or there may be intervening elements or layers. In contrast, when an element is referred to as "directly on", "directly adjacent to", "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be referred to as the second element, component, region, layer or part.

[0023] Spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over", etc. may be used herein for convenience of description to describe the relationship of one element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientation shown in the figures, the spatial relationship terms are also intended to include different orientations of the device in use and operation. For example, if the device in the drawings is flipped, then an element or feature described as "under other elements" or "beneath them" or "underneath them" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "beneath" can include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are to be interpreted accordingly.

[0024] The purpose of the terms used herein is only to describe specific embodiments and not to limit the present invention. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, specify the presence of the features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. As used herein, the term "and / or" includes any and all combinations of the related listed items.

[0025] To fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below. However, in addition to these detailed descriptions, the present invention may have other embodiments.

[0026] This embodiment provides an energy storage inverter 4, such as Figure 1As shown in the figure, it includes an AC power supply branch 41, a photovoltaic power supply branch 42, an energy storage power supply branch 43, an isolated power supply circuit 44 and a main control circuit 45; the AC power supply branch 41 is used to connect to an AC power supply 1, receive the AC power supply signal output by the AC power supply 1, and output a first power supply signal; the energy storage power supply branch 43 is used to connect to an energy storage power supply 2, receive the energy storage power supply signal output by the energy storage power supply 2, and output a second power supply signal; the photovoltaic power supply branch 42 is used to connect to a photovoltaic power supply 3 and is connected to the AC power supply branch 41 and the energy storage power supply branch 43, and is used to output a fourth power supply signal according to the first power supply signal, the second power supply signal and / or the third power supply signal output by the photovoltaic power supply 3; the isolated power supply circuit 44 is connected to the AC power supply branch 41, the photovoltaic power supply branch 42 and the main control circuit 45, and is used to output a fifth power supply signal to the main control circuit 45 according to the first power supply signal and / or the fourth power supply signal; the main control circuit 45 is connected to the AC power supply branch 41, the photovoltaic power supply branch 42 and the energy storage power supply branch 43, and is used to control at least one of the AC power supply branch 41, the photovoltaic power supply branch 42 and the energy storage power supply branch 43 to be in a working state according to the first power supply signal, the second power supply signal and the fourth power supply signal.

[0027] As an example, the AC power supply branch 41 is used for the power supply of the AC power supply 1. Exemplarily, the AC power supply 1 includes a mains power grid or an AC generator. The AC power supply branch 41 is used to connect to the AC power supply 1, receive the AC power supply signal output by the AC power supply 1, and output a first power supply signal. Exemplarily, the AC power supply branch 41 converts the AC power supply signal into a DC signal and performs voltage conversion on the DC signal to output the first power supply signal. It can be understood that the first power supply signal is a DC signal.

[0028] As an example, the energy storage power supply branch 43 is used for the power supply of the energy storage power supply 2. Exemplarily, the energy storage power supply 2 includes an energy storage battery. The energy storage power supply branch 43 is used to connect to the energy storage power supply 2, receive the energy storage power supply signal output by the energy storage power supply 2, and output a second power supply signal. Exemplarily, the energy storage power supply branch 43 performs voltage conversion on the energy storage power supply signal to output the second power supply signal. Exemplarily, both the energy storage power supply signal and the second power supply signal are DC signals.

[0029] As an example, the photovoltaic power supply branch 42 is used to connect to the photovoltaic power supply 3 and is connected to the AC power supply branch 41 and the energy storage power supply branch 43, and is used to output a fourth power supply signal according to the first power supply signal, the second power supply signal, and / or the third power supply signal output by the photovoltaic power supply 3. Exemplarily, the photovoltaic power supply 3, the AC power supply branch 41, and the energy storage power supply branch 43 are connected to the photovoltaic power supply branch 42 through a DC bus. The photovoltaic power supply branch 42 can perform voltage conversion on the first power supply signal provided by the AC power supply branch 41, the second power supply signal provided by the energy storage power supply branch 43, and the third power supply signal output by the photovoltaic power supply 3, and output a fourth power supply signal.

[0030] As an example, the isolated power supply circuit 44 is connected to the AC power supply branch 41, the photovoltaic power supply branch 42, and the main control circuit 45, and is used to output a fifth power supply signal to the main control circuit 45 according to the first power supply signal and / or the fourth power supply signal. In this example, the isolated power supply circuit 44 is used to output a fifth power supply signal to the main control circuit 45 to provide a working voltage for the main control circuit 45 to maintain the normal operation of the main control circuit 45. Exemplarily, the isolated power supply circuit 44 includes a first isolated power supply 441 and a second isolated power supply 442. The first isolated power supply 441 is disposed between the AC power supply branch 41 and the main control circuit 45. The second isolated power supply 442 is disposed between the photovoltaic power supply branch 42 and the main control circuit 45. The first isolated power supply 441 and the second isolated power supply 442 can adopt transformer isolation or optocoupler isolation to ensure the safety of the main control circuit 45.

[0031] As an example, the main control circuit 45 is connected to the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43, and is used to control at least one of the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43 to be in a working state according to the first power supply signal, the second power supply signal, and the fourth power supply signal. Exemplarily, the main control circuit 45 determines a power supply that meets the preset power supply conditions from the AC power supply 1, the energy storage power supply 2, and the photovoltaic power supply 3 according to the first power supply signal, the second power supply signal, and the fourth power supply signal, controls the power supply branch where it is located to enter the working state, and controls the power supply branches where other power supplies are located to enter the non-working state, so as to maintain the operation of the main control circuit 45 through the isolated power supply circuit 44, control the power supply branch where the power supply that meets the preset power supply conditions is located to enter the working state through the main control circuit 45, and control the power supply branches where other power supplies are located to enter the non-working state, thereby reducing energy consumption. It should be noted that when the energy storage inverter 4 operates in the emergency operation mode, the main control circuit 45 controls the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43 to all enter the working state to ensure normal power supply. Exemplarily, the preset power supply conditions include that the power supply voltage of the AC power supply 1, the energy storage power supply 2, or the photovoltaic power supply 3 is greater than the preset voltage.

[0032] In this embodiment, the energy storage inverter 4 includes an AC power supply branch 41, a photovoltaic power supply branch 42, an energy storage power supply branch 43, an isolation power supply circuit 44, and a main control circuit 45; the AC power supply branch 41 is used to connect to the AC power supply 1, receive the AC power supply signal output by the AC power supply 1, and output a first power supply signal; the energy storage power supply branch 43 is used to connect to the energy storage power supply 2, receive the energy storage power supply signal output by the energy storage power supply 2, and output a second power supply signal; the photovoltaic power supply branch 42 is used to connect to the photovoltaic power supply 3 and is connected to the AC power supply branch 41 and the energy storage power supply branch 43, and is used to output a fourth power supply signal according to the first power supply signal, the second power supply signal, and / or the third power supply signal output by the photovoltaic power supply 3; the isolation power supply circuit 44 is connected to the AC power supply branch 41, the photovoltaic power supply branch 42, and the main control circuit 45, and is used to output a fifth power supply signal to the main control circuit 45 according to the first power supply signal and / or the fourth power supply signal, so that the energy storage inverter 4 can adapt to multiple power supplies; the main control circuit 45 is connected to the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43, and is used to control at least one of the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43 to be in a working state according to the first power supply signal, the second power supply signal, and the fourth power supply signal, so as to maintain the operation of the main control circuit 45 through the isolation power supply circuit 44, so that the main control circuit 45 can select some power supply branches from the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43 to enter the working state, and other power supply branches enter the non-working state, thereby reducing energy consumption.

[0033] In one embodiment, the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43 are each provided with a switching power supply circuit and a switching control circuit; the switching control circuit is connected to the switching power supply circuit and the main control circuit 45, and is used to control the switching power supply circuit to enter the non-working state according to the first control signal of the main control circuit 45, and control the switching power supply circuit to enter the working state according to the second control signal of the main control circuit 45.

[0034] As an example, the first end of the switching power supply circuit in the AC power supply branch 41 is coupled to the AC power supply 1, and the second end of the switching power supply circuit in the AC power supply branch 41 is connected to the photovoltaic power supply branch 42 through a DC bus.

[0035] As another example, the first end of the switching power supply circuit in the energy storage power supply branch 43 is coupled to the energy storage power supply 2, and the second end of the switching power supply circuit in the energy storage power supply branch 43 is connected to the photovoltaic power supply branch 42 through a DC bus.

[0036] As another example, the first end of the switching power supply circuit in the photovoltaic power supply branch 42 is connected to the photovoltaic power supply 3 through a DC bus, the second end of the switching power supply circuit in the AC power supply branch 41, and the second end of the switching power supply circuit in the energy storage power supply branch 43.

[0037] In this embodiment, by respectively arranging a switching power supply circuit and a switching control circuit in the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43, the switching power supply circuit is used for voltage conversion. At the same time, the main control circuit 45 controls the working state of the switching power supply circuit through the switching control circuit, enables the power supply branch that meets the preset power supply conditions to enter the working state, and controls other power supply branches to enter the non-working state, thereby reducing energy consumption.

[0038] In one embodiment, the AC power supply branch 41 further includes a rectification circuit 411; the rectification circuit 411 is connected to the AC power supply 1 and is used for receiving the AC power supply signal output by the AC power supply 1 and outputting a first DC signal; the switching power supply circuit is connected to the rectification circuit 411 and is used for outputting a first power supply signal according to the first DC signal.

[0039] As an example, the rectification circuit 411 includes a rectifier bridge circuit; the first end of the rectifier bridge circuit is connected to the AC power supply 1, and the second end of the rectifier bridge circuit is connected to the switching power supply circuit and is used for converting the AC power supply signal into a first DC signal. It can be understood that the corresponding number of rectifier bridge circuits can be set according to the number of AC power supplies 1. For example, if the AC power supply 1 includes a commercial power grid and an AC generator, two rectifier bridge circuits are set, one rectifier bridge circuit is set between the commercial power grid and the switching power supply circuit, and the other rectifier bridge circuit is set between the AC generator and the switching power supply circuit.

[0040] In this embodiment, through the rectification circuit 411, which is connected to the AC power supply 1 and is used for receiving the AC power supply signal output by the AC power supply 1 and outputting a first DC signal; the switching power supply circuit, which is connected to the rectification circuit 411 and is used for outputting a first power supply signal according to the first DC signal, AC power supply is thus realized.

[0041] In this embodiment, the switching power supply circuit includes a flyback circuit or a Buck circuit.

[0042] In this embodiment, the switching power supply circuit includes a flyback circuit or a Buck circuit. The flyback circuit can be applied to scenarios that require electrical isolation, step-up / step-down, or multiple outputs, providing a flexible power supply solution. The Buck circuit can be applied to non-isolated step-down scenarios, with a simple structure, high efficiency, and low cost. By combining the two circuit forms, the diverse requirements for power supply stability, efficiency, volume, and cost in different scenarios can be met.

[0043] In one embodiment, asFigure 2 As shown in FIG. 2 or FIG. 3, the switch control circuit includes a disconnector circuit 51 and a pulse width modulation control chip 52; the pulse width adjustment control chip is connected to the switching power supply circuit and is used to control the operation of the switching power supply circuit in the working state; the disconnector circuit 51 is connected to the main control circuit 45 and the pulse width modulation control chip 52 and is used to control the pulse width modulation control chip 52 to enter the non-working state according to the first control signal; and to control the pulse width modulation control chip 52 to enter the working state according to the second control signal.

[0044] As an example, the pulse width adjustment control chip is connected to the power switch of the transformer in the switching power supply circuit, and the steady-state regulation of voltage or current is achieved by adjusting the duty cycle of the power switch, thereby controlling the operation of the switching power supply circuit.

[0045] As an example, the disconnector circuit 51 is connected to the main control circuit 45 and the pulse width modulation control chip 52 and is used to control the pulse width modulation control chip 52 to enter the non-working state according to the first control signal; and to control the pulse width modulation control chip 52 to enter the working state according to the second control signal. When the main control circuit 45 needs to control the switching power supply circuit to enter the non-working state, it outputs the first control signal to the disconnector circuit 51 to control the switching state of the disconnector circuit 51, thereby controlling the pulse width modulation control chip 52 to stop working through the switching state of the disconnector circuit 51, and further controlling the switching power supply circuit to enter the non-working state. Exemplarily, the switching state includes a conducting state and a cut-off state, and one of the states is used to control the pulse width modulation control chip 52 to stop working, and the other state is used to control the pulse width modulation control chip 52 to start working.

[0046] In this embodiment, by connecting the pulse width adjustment control chip to the switching power supply circuit to control the operation of the switching power supply circuit in the working state; the disconnector circuit 51 is connected to the main control circuit 45 and the pulse width modulation control chip 52 and is used to control the pulse width modulation control chip 52 to enter the non-working state according to the first control signal; and to control the pulse width modulation control chip 52 to enter the working state according to the second control signal, thereby using the disconnector circuit 51 to control the working state of the pulse width modulation control chip 52 on the premise of ensuring the safety of the main control circuit 45, and further controlling the working state of the switching power supply circuit, with strong reliability and safety, simple circuit structure, and reduced cost.

[0047] In one embodiment, the disconnector circuit 51 includes a first switching tube and an isolation relay K1; the isolation relay K1 includes a coil (1, 2), a first normally closed contact 5, and a second normally closed contact 3 connected to the first normally closed contact 5; the first switching tube and the coil are connected in series between the first power supply terminal and the ground, and the control terminal of the first switching tube is connected to the main control circuit 45; the first normally closed contact 5 is connected to the second power supply terminal, and the second normally closed contact 3 is connected to the pulse width modulation control chip 52.

[0048] Exemplarily, the voltages of the first power supply terminal and the second power supply terminal may be the same or different, which can be selected according to actual requirements and are not limited herein.

[0049] As an example, the first switching transistor is a triode. The source of the first switching transistor Q1 is connected to the first power supply terminal through the coil of the isolation relay K1, the drain of the first switching transistor Q1 is grounded, and the base of the first switching transistor Q1 is connected to the main control circuit 45 (AUX - OFF) through voltage - dividing resistors R1 and R2. Preferably, the source of the first switching transistor Q1 is also connected to the first power supply terminal through a diode D1. The first normally - closed contact 5 is connected to the second power supply terminal, and the second normally - closed contact 3 is connected to the power supply terminal VCC of the pulse - width modulation control chip 52. Preferably, the power supply terminal VCC of the pulse - width modulation control chip 52 is also grounded through a capacitor C1. In this example, the power supply terminal VCC of the pulse - width modulation control chip 52 is connected in series between the first normally - closed contact 5 and the second normally - closed contact 3 of the isolation relay K1. When the first control signal is at a high level, the first switching transistor Q1 conducts, the coil of the isolation relay K1 is energized, the isolation relay K1 operates, and the contacts switch to the normally - open contact 4 of the isolation relay K1. The second power supply terminal does not supply power to the power supply terminal VCC of the pulse - width modulation control chip 52, and the pulse - width modulation control chip 52 stops working, thereby controlling the switching power supply circuit to stop working. The circuit structure is simple and the safety is high.

[0050] In one embodiment, the isolation switch circuit 51 includes an isolation optocoupler K2; the isolation optocoupler K2 includes a light - emitting diode and a photosensitive triode; the anode of the light - emitting diode is connected to the main control circuit 45, and the cathode of the light - emitting diode is grounded; the first end of the photosensitive triode is connected to the pulse - width modulation control chip 52, and the second end of the photosensitive triode is grounded.

[0051] As an example, the pulse - width modulation control chip 52 can be a UC384X chip. The anode of the light - emitting diode is connected to the main control circuit 45 (AUX - OFF) through voltage - dividing resistors R3 and R4, and the cathode of the light - emitting diode is grounded; the first end of the photosensitive triode is connected to the COMP terminal of the pulse - width modulation control chip 52, and the second end of the photosensitive triode is grounded. In this example, when the first control signal is at a high level, the photosensitive triode conducts, the level of the COMP terminal becomes low, and the pulse - width modulation control chip 52 stops outputting PWM signals to the power switch in the switching power supply circuit, thereby controlling the switching power supply circuit to enter a non - working state.

[0052] In this embodiment, the isolation optocoupler K2 includes a light-emitting diode and a photosensitive triode; the anode of the light-emitting diode is connected to the main control circuit 45, and the cathode of the light-emitting diode is grounded; the first end of the photosensitive triode is connected to the pulse width modulation control chip 52, and the second end of the photosensitive triode is grounded. By using the isolation optocoupler K2 to control the pulse width modulation control chip 52, the response speed is fast, the anti-interference ability is strong, and the service life is long.

[0053] This embodiment provides a control method for an energy storage inverter 4, as Figure 4 shown, which is applied to the above-mentioned main control circuit 45 and includes: S401: If the current working mode is the emergency power supply mode, then control the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43 to be all in the working state.

[0054] S402: If the current working mode is the non-emergency working mode, then obtain the second power supply signal output by the energy storage power supply branch 43 and the fourth power supply signal output by the photovoltaic power supply branch 42, and respectively judge whether the energy storage power supply 2 or the photovoltaic power supply 3 meets the preset power supply conditions according to the second power supply signal and the fourth power supply signal.

[0055] S403: If the photovoltaic power supply 3 meets the preset power supply conditions, then control the photovoltaic power supply branch 42 to be in the working state, and control the AC power supply branch 41 and the energy storage power supply branch 43 to be in the non-working state.

[0056] S404: If the photovoltaic power supply 3 does not meet the preset power supply conditions and the energy storage power supply 2 meets the preset power supply conditions, then control the photovoltaic power supply branch 42 and the energy storage power supply branch 43 to be in the working state, and control the AC power supply branch 41 to be in the non-working state.

[0057] S405: If both the energy storage power supply 2 and the photovoltaic power supply 3 do not meet the preset power supply conditions, then control the AC power supply branch 41 to be in the working state, and control the photovoltaic power supply branch 42 to be in the working state according to the preset periodic interval.

[0058] Among them, the emergency power supply mode refers to a special operation mode triggered under specific abnormal situations (such as power failure of the commercial power or abnormal power grid).

[0059] As an example, in step S401, if the current working mode is the emergency power supply mode, then control the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43 to be all in the working state, so as to ensure the normal power supply of the load.

[0060] As an example, in step S402, if the current working mode is a non-emergency working mode, obtain the second power supply signal output by the energy storage power supply branch 43 and the fourth power supply signal output by the photovoltaic power supply branch 42, and respectively determine whether the energy storage power supply 2 or the photovoltaic power supply 3 meets the preset power supply conditions according to the second power supply signal and the fourth power supply signal. Exemplarily, the preset power supply conditions include that the power supply voltage of the energy storage power supply 2 or the photovoltaic power supply 3 is greater than the preset voltage. Select the power supply branch that needs to be turned off according to the preset power supply conditions to reduce losses.

[0061] As an example, in step S403, if the photovoltaic power supply 3 meets the preset power supply conditions, control the photovoltaic power supply branch 42 to be in the working state, and control the AC power supply branch 41 and the energy storage power supply branch 43 to be in the non-working state. In this example, if the photovoltaic power supply 3 meets the preset power supply conditions, that is, the power supply voltage of the photovoltaic power supply 3 is greater than the preset voltage, then preferentially supply power to the main control circuit 45 and the load through the photovoltaic power supply branch 42, control the photovoltaic power supply branch 42 to be in the working state, and control the AC power supply branch 41 and the energy storage power supply branch 43 to be in the non-working state.

[0062] As an example, in step S404, if the photovoltaic power supply 3 does not meet the preset power supply conditions and the energy storage power supply 2 meets the preset power supply conditions, control the photovoltaic power supply branch 42 and the energy storage power supply branch 43 to be in the working state, and control the AC power supply branch 41 to be in the non-working state. In this example, if the photovoltaic power supply 3 does not meet the preset power supply conditions, that is, the power supply voltage of the photovoltaic power supply 3 is not greater than the preset voltage, and the energy storage power supply 2 meets the preset power supply conditions, that is, the power supply voltage of the energy storage power supply 2 is greater than the preset voltage, then control the photovoltaic power supply branch 42 and the energy storage power supply branch 43 to be in the working state, and control the AC power supply branch 41 to be in the non-working state. Since the second power supply signal provided by the energy storage power supply branch 43 needs to be output to the main control circuit 45 and the load through the photovoltaic power supply branch 42, control the photovoltaic power supply branch 42 and the energy storage power supply branch 43 to be in the working state, and control the AC power supply branch 41 to be in the non-working state to reduce losses.

[0063] As an example, in step S405, if both the energy storage power supply 2 and the photovoltaic power supply 3 do not meet the preset power supply conditions, control the AC power supply branch 41 to be in the working state, and control the photovoltaic power supply branch 42 to be in the working state according to a preset periodic interval. In this example, the preset period can be set according to actual experience and is not limited here. When both the energy storage power supply 2 and the photovoltaic power supply 3 do not meet the preset power supply conditions, control the AC power supply branch 41 to be in the working state, and control the photovoltaic power supply branch 42 to be in the working state according to a preset periodic interval. Compared with always turning on the photovoltaic power supply branch 42, it can greatly reduce losses and solve the problem of large AC losses when the energy storage inverter 4 has no photovoltaic source at night and the energy storage battery is discharged.

[0064] In this embodiment, if the current working mode is the emergency power supply mode, the AC power supply branch 41, the photovoltaic power supply branch 42, and the energy storage power supply branch 43 are all controlled to be in the working state. If the current working mode is the non-emergency working mode, the second power supply signal output by the energy storage power supply branch 43 and the fourth power supply signal output by the photovoltaic power supply branch 42 are obtained, and according to the second power supply signal and the fourth power supply signal, it is respectively determined whether the energy storage power source 2 or the photovoltaic power source 3 meets the preset power supply conditions. If the photovoltaic power source 3 meets the preset power supply conditions, the photovoltaic power supply branch 42 is controlled to be in the working state, and the AC power supply branch 41 and the energy storage power supply branch 43 are controlled to be in the non-working state. If the photovoltaic power source 3 does not meet the preset power supply conditions and the energy storage power source 2 meets the preset power supply conditions, the photovoltaic power supply branch 42 and the energy storage power supply branch 43 are controlled to be in the working state, and the AC power supply branch 41 is controlled to be in the non-working state. If both the energy storage power source 2 and the photovoltaic power source 3 do not meet the preset power supply conditions, the AC power supply branch 41 is controlled to be in the working state, and the photovoltaic power supply branch 42 is controlled to be in the working state according to the preset periodic interval, so as to only maintain the power supply of the main control circuit 45 and control the photovoltaic power supply branch 42 to be in the working state according to the preset periodic interval to monitor whether the photovoltaic power source 3 has power. When the photovoltaic power source 3 has power, it is timely switched to the single photovoltaic power supply branch 42, and the AC power supply branch 41 is turned off to achieve lower losses; if the photovoltaic power source 3 has no power, the original state is maintained. The photovoltaic power supply branch 42 is turned on according to the preset periodic interval, greatly reducing the losses.

[0065] Furthermore, the main control circuit 45 also has a monitoring function. The energy storage inverter 4 information is sent to the server by using data collection rods such as WI-FI, 4G, and Ethernet, and the server then sends the information to the user's client to realize night monitoring.

[0066] This embodiment provides an energy storage inverter system, including an AC power source 1, an energy storage power source 2, a photovoltaic power source 3, and the above-mentioned energy storage inverter 4; the energy storage inverter 4 is used to connect to a load and is connected to the AC power source 1, the energy storage power source 2, and the photovoltaic power source 3.

[0067] In one embodiment, the AC power source 1 includes a commercial power grid and / or an AC generator.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. An energy storage inverter, characterized in that: Including AC power supply branch, photovoltaic power supply branch, energy storage power supply branch, isolation power supply circuit and main control circuit; The AC power supply branch is used to connect to the AC power supply, receive the AC power supply signal output by the AC power supply, and output a first power supply signal; The energy storage power supply branch is used to connect to the energy storage power supply source, receive the energy storage power supply signal output by the energy storage power supply source, and output a second power supply signal; The photovoltaic power supply branch is used to connect to the photovoltaic power supply source and is connected to the AC power supply branch and the energy storage power supply branch, and is used to output a fourth power supply signal according to the first power supply signal, the second power supply signal and / or the third power supply signal output by the photovoltaic power supply source; The isolated power supply circuit is connected to the AC power supply branch, the photovoltaic power supply branch and the main control circuit, and is used to output a fifth power supply signal to the main control circuit according to the first power supply signal and / or the fourth power supply signal; The main control circuit is connected to the AC power supply branch, the photovoltaic power supply branch and the energy storage power supply branch, and is used to control at least one of the AC power supply branch, the photovoltaic power supply branch and the energy storage power supply branch to be in a working state according to the first power supply signal, the second power supply signal and the fourth power supply signal.

2. The energy storage inverter according to claim 1, characterized in that: The AC power supply branch, the photovoltaic power supply branch and the energy storage power supply branch are each provided with a switching power supply circuit and a switching control circuit; The switch control circuit is connected to the switch power supply circuit and the main control circuit, and is used to control the switch power supply circuit to enter a non-working state according to a first control signal of the main control circuit, and to control the switch power supply circuit to enter a working state according to a second control signal of the main control circuit.

3. The energy storage inverter according to claim 2, characterized in that: The AC power supply branch also includes a rectifier circuit; The rectifier circuit is connected to the AC power supply, and is used to receive the AC power supply signal output by the AC power supply, and output a first DC signal; The switching power supply circuit is connected to the rectifier circuit, and is used to output a first power supply signal according to the first DC signal.

4. The energy storage inverter according to claim 2, characterized in that: The switching power supply circuit includes a flyback circuit or a Buck circuit.

5. The energy storage inverter according to claim 2, characterized in that: The switch control circuit includes an isolation switch circuit and a pulse width modulation control chip; The pulse width adjustment control chip is connected to the switching power supply circuit and is used to control the operation of the switching power supply circuit in a working state; The isolating switch circuit is connected to the main control circuit and the pulse width modulation control chip, and is used to control the pulse width modulation control chip to enter a non-working state according to the first control signal; and to control the pulse width modulation control chip to enter a working state according to the second control signal.

6. The energy storage inverter according to claim 5, characterized in that: The isolating switch circuit includes a first switch tube and an isolating relay; the isolating relay includes a coil, a first normally closed contact and a second normally closed contact connected to the first normally closed contact; The first switch tube and the coil are arranged in series between the first power supply end and the ground, and the control end of the first switch tube is connected to the main control circuit; The first normally closed contact is connected to the second power supply end, and the second normally closed contact is connected to the pulse width modulation control chip.

7. The energy storage inverter according to claim 5, characterized in that: The isolation switch circuit includes an isolation optocoupler; the isolation optocoupler includes a light emitting diode and a phototransistor; The anode of the light emitting diode is connected to the main control circuit, and the cathode of the light emitting diode is grounded; The first end of the phototransistor is connected to the pulse width modulation control chip, and the second end of the phototransistor is grounded.

8. A method for controlling an energy storage inverter, applied in the main control circuit according to any one of claims 1 to 7, comprising: If the current working mode is the emergency power supply mode, the AC power supply branch, the photovoltaic power supply branch and the energy storage power supply branch are all controlled to be in working state; If the current working mode is a non-emergency working mode, the second power supply signal output by the energy storage power supply branch and the fourth power supply signal output by the photovoltaic power supply branch are obtained, and according to the second power supply signal and the fourth power supply signal, it is respectively determined whether the energy storage power supply or the photovoltaic power supply meets the preset power supply conditions; If the photovoltaic power supply meets the preset power supply conditions, the photovoltaic power supply branch is controlled to be in a working state, and the AC power supply branch and the energy storage power supply branch are controlled to be in a non-working state; If the photovoltaic power supply source does not meet the preset power supply conditions, and the energy storage power supply source meets the preset power supply conditions, the photovoltaic power supply branch and the energy storage power supply branch are controlled to be in a working state, and the AC power supply branch is controlled to be in a non-working state; If both the energy storage power supply and the photovoltaic power supply do not meet the preset power supply conditions, the AC power supply branch is controlled to be in a working state, and the photovoltaic power supply branch is controlled to be in a working state according to a preset periodic interval.

9. An energy storage inverter system, characterized in that: Comprising an AC power supply, an energy storage power supply, a photovoltaic power supply and an energy storage inverter as claimed in any one of claims 1 to 7; The energy storage inverter is used to connect the load and is connected to the AC power supply, the energy storage power supply and the photovoltaic power supply.

10. The energy storage inverter system according to claim 9, characterized in that: The AC power supply includes a mains power grid and / or an AC generator.

Images