Energy storage inverter device

Abstract

The utility model belongs to the technical field of circuits, and discloses an energy storage inverter device, which comprises a port INPUT, the port INPUT is connected with one end of an inductor L1 and one end of a capacitor C1, the other end of the inductor L1 is connected with one end of a switch tube Q1 and one end of a capacitor C3, the other end of the capacitor C3 is connected with a pin 1 of a transformer T1, and the other end of the transformer T1 is connected with a pin 2 of the transformer T1. A pin 1 of the transformer T1 is connected with one end of the switch tube Q1, a pin 2 of the transformer T1 is connected with the other end of the switch tube Q1, the other end of the capacitor C1 and a port GND, a pin 3 of the transformer T1 is connected with one end of the switch tube Q2, a pin 4 of the transformer T1 is connected with one end of the capacitor C5 and a port OUT, and the other end of the capacitor C5 is connected with the other end of the switch tube Q2 and a port AGND. The beneficial effects of the utility model are that the structure is simple, the cost is low, the stable bus voltage control can be realized, and the performance requirement can be satisfied.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit technical field especially relates to a kind of energy storage inverter device. BACKGROUND

[0002] In the application of energy storage inverter, off-grid inverter, grid-connected and off-grid inverter, generally, inverter bridge (H4) or Heric (H6) etc. Inverter link is used, plus the MPPT part of Boost to bus realizes. Working mode can be solar charging battery, mains charging battery, solar inverter grid-connected or off-grid output, battery inverter grid-connected or off-grid output etc. Function. In some low-cost applications, only LLC bidirectional variable conversion is used. LLC+buck / boost has good performance, but the cost is relatively high, single LLC scheme can realize relevant conversion, but generally not in the way of voltage stabilizing.

[0003] In the occasion of energy storage inverter, off-grid inverter, grid-connected and off-grid inverter, working mode generally has mains, realizes bus voltage from power grid, then charges battery through bidirectional DC conversion. In LLC+buck / boost application occasion, due to two-stage conversion, control and regulation can be realized very conveniently, and bus voltage stabilization can be realized, which is good for inverter output parallel, MPPT application. In the application of LLC single-stage bidirectional conversion, to realize soft switch machine control, bus voltage is unstable, in the case of battery voltage range charging, output parallel, grid-connected application, etc. The performance of inverter has great limitation, various abnormalities are prone to occur, even damage, etc.

[0004] Therefore, it is necessary to provide an energy storage inverter device, which can realize stable bus voltage control and meet the performance requirements. UTILITY MODEL CONTENT

[0005] The utility model discloses a kind of energy storage inverter devices, it is related to power electronics technical field, it is widely applied in the field of energy storage inverter, off-grid inverter, grid-connected and off-grid inverter, it can effectively solve the technical problems involved in background technology.

[0006] To achieve the above object, the technical scheme of the utility model is as follows:

[0007] An energy storage inverter device, comprising a port INPUT, one end of an inductor L1 and one end of a capacitor C1 are connected, the other end of the inductor L1 is connected to one end of a switch tube Q1 and one end of a capacitor C3, the other end of the capacitor C3 is connected to a pin 1 of a transformer T1, a pin 2 of the transformer T1 is connected to the other end of the switch tube Q1, the other end of the capacitor C1 and a port GND, a pin 3 of the transformer T1 is connected to one end of a switch tube Q2, a pin 4 of the transformer T1 is connected to one end of a capacitor C5 and a port OUT, the other end of the capacitor C5 is connected to the other end of the switch tube Q2 and a port AGND.

[0008] As a preferred improvement of the utility model: the port INPUT connects a power supply and a load, the port OUT connects a battery.

[0009] As a preferred improvement of the utility model: the power supply is photovoltaic, and the load is an inverter.

[0010] As a preferred improvement of the utility model: the photovoltaic is connected to the port INPUT and the inverter through an MPPT circuit, and the MPPT circuit comprises an inductor L2, one end of the inductor L2 is connected to a positive terminal of the photovoltaic, the other end of the inductor L2 is connected to one end of a switch tube Q3 and a positive terminal of a diode D1, a negative terminal of the diode D1 is connected to one end of a capacitor C8 and the port INPUT, and the other end of the capacitor C8 is connected to a negative terminal of the photovoltaic and the other end of the switch tube Q3.

[0011] As a preferred improvement of the utility model: the type of the switch tube Q1 includes but is not limited to MOS tube, IGBT, bipolar triode, silicon carbide and gallium nitride, and the type of the switch tube Q2 includes but is not limited to MOS tube, IGBT, bipolar triode, silicon carbide and gallium nitride.

[0012] As a preferred improvement of the utility model: the type of the switch tube Q1 includes but is not limited to MOS tube, IGBT, bipolar triode, silicon carbide and gallium nitride, and the switch tube Q2 is a diode, or the switch tube Q1 is a diode, and the type of the switch tube Q2 includes but is not limited to MOS tube, IGBT, bipolar triode, silicon carbide and gallium nitride.

[0013] As a preferred improvement of the utility model: the switch tube Q1 is a MOS tube, a source electrode of the switch tube Q1 is connected to the port GND, and a drain electrode of the switch tube Q1 is connected to the other end of the inductor L1.

[0014] As a preferred improvement of the utility model: the switch tube Q2 is a MOS tube, a source electrode of the switch tube Q2 is connected to the port AGND, and a drain electrode of the switch tube Q2 is connected to the pin 3 of the transformer T1.

[0015] As a preferred improvement of the utility model: the port GND and the port AGND are connected with different ground terminals.

[0016] As a preferred improvement of the utility model: the circuit further comprises a box body, the box body is cuboid and is provided with an inner cavity, the box body top is provided with an opening communicated with the inner cavity, the opening is provided with an access door, the access door is connected with the box body through buckling, the left side wall of the box body is provided with a connecting socket one and a connecting socket two, the right side wall of the box body is provided with a connecting socket three and a connecting socket four, the inner cavity is provided with a PCB board, the PCB board is fixed on the inner wall of the bottom of the box body through screws, the inductor L1, the capacitor C1, the capacitor C3, the switch tube Q1, the transformer T1, the switch tube Q2 and the capacitor C5 are installed on the PCB board and are connected in sequence, the port INPUT is connected with the connecting socket one, the port GND is connected with the connecting socket two, the port OUT is connected with the connecting socket three, the port AGND is connected with the connecting socket four, the side wall of the box body is provided with a heat dissipation hole, and the bottom of the box body is connected with a water-cooling plate.

[0017] The utility model has the advantages of the following:

[0018] The simple structure and low cost adopt a single-stage DC / DC bidirectional converter, a series connection inverter circuit and an MPPT circuit to replace LLC or LLC+buck / boost application, can realize stable bus voltage control and meet the performance requirement, in particular, the single-stage circuit replaces the bridge circuit, high-voltage silicon carbide devices are adopted, better reliability and similar efficiency can be realized, the cost can be reduced, the size can be reduced, the control can be simplified and the like. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating creative labor, wherein:

[0020] Figure 1 It is the circuit schematic diagram of the utility model one kind of energy storage inverter device;

[0021] Figure 2 It is the MPPT circuit structure schematic diagram of the utility model;

[0022] Figure 3 It is the one-way use schematic of the utility model Figure 1 ;

[0023] Figure 4 for the utility model one-way use schematic Figure 2 . DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0026] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0027] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0029] Please refer to Figures 1-2As shown, the utility model provides a kind of energy storage inverter device, including port INPUT (point connection node), the port INPUT connects the one end of inductance L1 and the one end of capacitor C1, the other end of inductance L1 connects the one end (drain) of switch tube Q1 and the one end of capacitor C3, the other end of capacitor C3 connects the pin 1 of transformer T1, the pin 2 of transformer T1 connects the other end (source) of the switch tube Q1, the other end of capacitor C1 and port GND, the pin 3 of transformer T1 connects the one end (drain) of switch tube Q2, the pin 4 of transformer T1 connects the one end of capacitor C5 and port OUT, the other end of capacitor C5 connects the other end (source) of the switch tube Q2 and port AGND.The port INPUT connects power supply and load, the port OUT connects battery positive end, and battery negative end can be connected port AGND.In the embodiment, the power supply is photovoltaic, and the load is inverter.The photovoltaic is connected port INPUT and inverter by MPPT circuit, and MPPT circuit includes inductance L2, the one end of inductance L2 is connected photovoltaic positive end, the other end of inductance L2 is connected the one end (drain) of switch tube Q3 and the positive end of diode D1, the negative end of diode D1 is connected the one end of capacitor C8 and port INPUT, the other end (source) of switch tube Q3 is connected photovoltaic negative end and the other end of capacitor C8.The port GND and the port AGND are generally connected different ground, and can also be connected same ground.In the figure, for DCDC bidirectional use, the kind of switch tube Q1 includes but is not limited to MOS tube, IGBT, bipolar triode, silicon carbide and gallium nitride, and the kind of switch tube Q2 includes but is not limited to MOS tube, IGBT, bipolar triode, silicon carbide and gallium nitride.

[0030] Specifically, a new bidirectional DCDC topology is proposed to replace the original LLC bidirectional circuit that cannot realize wide range of battery and bus voltage, or the complex LLC+buck / boost idea, which can realize wide battery voltage range and bus voltage range without reducing efficiency, thereby realizing the needs of high reliability, small size and low cost of energy storage inverter, off-grid inverter, on-off grid inverter and other applications. The circuit is shown in the figure, which is composed of inductance, isolation capacitor, transformer and power switch tube.

[0031] Forward operation (battery charging):

[0032] 1, Q1 and Q2 complementary switching.

[0033] When Q1 is turned on, Q2 is turned off, inductance L1 stores energy through Q1, transformer T1 and capacitor C3 reset.

[0034] 2, when Q1 is turned off, Q2 is turned on, inductance L1 energy is transmitted to the battery side through capacitor C3 and transformer.

[0035] When working in reverse (battery discharging):

[0036] 1. When Q2 is on, Q1 is off, the battery energy is transferred to the bus side through C3 and L1, and L1 stores energy.

[0037] 2. When Q2 is off, Q1 is on, inductor L1 continues to flow, energy is released to the bus side, C3 and T1 reset.

[0038] The topology is simple, the device is less, and the cost is also low, which can replace the expensive Buck / Boost+LLC structure, complete the bidirectional DCDC conversion of battery charging and discharging, the high-voltage side of the circuit is connected between the photovoltaic and the inverter, and the low-voltage side is connected to the battery.

[0039] Please refer to Figures 3-4 When used for one-way operation, the switch tube of the primary side or the secondary side can be replaced by a diode, the type of the switch tube Q1 includes but is not limited to MOS tube, IGBT, bipolar triode, silicon carbide and gallium nitride, the switch tube Q2 is a diode, or the switch tube Q1 is a diode, and the type of the switch tube Q2 includes but is not limited to MOS tube, IGBT, bipolar triode, silicon carbide and gallium nitride.

[0040] As an embodiment, the circuit further comprises a box body which is cuboid-shaped and is provided with an inner cavity, the box body is provided with an opening which is in communication with the inner cavity, the opening is provided with an access door, the access door is connected with the box body through buckling, a first connecting jack and a second connecting jack are arranged on the left side wall of the box body, a third connecting jack and a fourth connecting jack are arranged on the right side wall of the box body, a PCB is arranged in the inner cavity, the PCB is fixed to the inner wall of the bottom of the box body through screws, the inductor L1, the capacitor C1, the capacitor C3, the switch tube Q1, the transformer T1, the switch tube Q2 and the capacitor C5 are mounted on the PCB and are sequentially connected, the port INPUT is connected with the first connecting jack, the port GND is connected with the second connecting jack, the port OUT is connected with the third connecting jack, and the port AGND is connected with the fourth connecting jack, the side wall of the box body is provided with heat dissipation holes, and the bottom of the box body is connected with a water cooling plate. The box body bears the whole circuit, convenient to carry and install, multiple connecting jacks are reserved, the internal DCDC circuit is convenient to connect with photovoltaic, load and the like, the heat dissipation holes and the water cooling plate can reduce the temperature in the inner cavity of the box body, protect the stable operation of the internal devices, the bottom of the box body is coated with heat-conducting glue, a metal material with good heat conduction is adopted, and good heat dissipation is guaranteed. The water tank stores water, a refrigeration device is arranged in the water tank, and a water pump drives water to circulate between the water cooling plate and the water tank, so that the circuit structure is cooled. It should be further pointed out that other components can be adopted to achieve the above effects, which should belong to the inventive concept of the utility model and should belong to the protection scope of the utility model.

[0041] While the embodiments of the present application have been disclosed as above, it is not limited to the use listed in the specification and the embodiments, and can be applied to various fields suitable for the present application. Those skilled in the art can easily implement additional modifications, and thus the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

Claims

1. An energy storage inverter device, characterized in that: The system includes a port INPUT, which is connected to one end of inductor L1 and one end of capacitor C1. The other end of inductor L1 is connected to one end of switch Q1 and one end of capacitor C3. The other end of capacitor C3 is connected to pin 1 of transformer T1. Pin 2 of transformer T1 is connected to the other end of switch Q1, the other end of capacitor C1, and port GND. Pin 3 of transformer T1 is connected to one end of switch Q2. Pin 4 of transformer T1 is connected to one end of capacitor C5 and port OUT. The other end of capacitor C5 is connected to the other end of switch Q2 and port AGND.

2. The energy storage inverter device according to claim 1, characterized in that: The INPUT port is connected to the power supply and the load, and the OUT port is connected to the battery.

3. The energy storage inverter device according to claim 2, characterized in that: The power source is photovoltaic, and the load is an inverter.

4. The energy storage inverter device according to claim 3, characterized in that: The photovoltaic system is connected to the INPUT port and the inverter via an MPPT circuit. The MPPT circuit includes an inductor L2, one end of which is connected to the positive terminal of the photovoltaic system, and the other end of which is connected to one end of the switching transistor Q3 and the positive terminal of the diode D1. The negative terminal of the diode D1 is connected to one end of the capacitor C8 and the INPUT port, and the other end of the switching transistor Q3 is connected to the negative terminal of the photovoltaic system and the other end of the capacitor C8.

5. The energy storage inverter device according to claim 1, characterized in that: The types of switching transistors Q1 include, but are not limited to, MOSFETs, IGBTs, bipolar transistors, silicon carbide, and gallium nitride, and the types of switching transistors Q2 include, but are not limited to, MOSFETs, IGBTs, bipolar transistors, silicon carbide, and gallium nitride.

6. The energy storage inverter device according to claim 1, characterized in that: The types of switching transistor Q1 include, but are not limited to, MOSFETs, IGBTs, bipolar transistors, silicon carbide, and gallium nitride. The types of switching transistor Q2 include, but are not limited to, MOSFETs, IGBTs, bipolar transistors, silicon carbide, and gallium nitride. Alternatively, the types of switching transistor Q1 include, but are not limited to, MOSFETs, IGBTs, bipolar transistors, silicon carbide, and gallium nitride.

7. The energy storage inverter device according to claim 1, characterized in that: The switching transistor Q1 is a MOSFET, the source of the switching transistor Q1 is connected to the port GND, and the drain of the switching transistor Q1 is connected to the other end of the inductor L1.

8. The energy storage inverter device according to claim 1, characterized in that: The switching transistor Q2 is a MOSFET, the source of the switching transistor Q2 is connected to the port AGND, and the drain of the switching transistor Q2 is connected to pin 3 of the transformer T1.

9. The energy storage inverter device according to claim 1, characterized in that: The port GND and the port AGND are connected to different grounding terminals.

10. The energy storage inverter device according to claim 1, characterized in that: The circuit also includes a box, which is rectangular in shape and has an inner cavity. The top of the box has an opening communicating with the inner cavity, and an inspection door is provided at the opening. The inspection door is connected to the box by a snap-fit. The left side wall of the box has two connection ports, and the right side wall has two connection ports. A PCB board is provided in the inner cavity and is fixed to the bottom inner wall of the box by screws. The inductor L1, capacitor C1, capacitor C3, switching transistor Q1, transformer T1, switching transistor Q2, and capacitor C5 are mounted on the PCB board and connected in sequence. Port INPUT is connected to connection port one, port GND is connected to connection port two, port OUT is connected to connection port three, and port AGND is connected to connection port four. The side wall of the box has heat dissipation holes, and a water-cooling plate is connected to the bottom of the box.

Images