Energy storage inverter and battery wake-up circuit thereof

Abstract

The utility model discloses an energy storage inverter and a battery wake-up circuit thereof. The battery wake-up circuit of the energy storage inverter comprises a wake-up instruction access terminal used for receiving a wake-up instruction signal; the control end of the switch is connected to the wake-up instruction access terminal; the primary side of the optical coupler is connected to the switch, and the secondary side of the optical coupler is connected with a first power supply terminal; and the wake-up signal output terminal is connected to the secondary side of the optocoupler. The battery wake-up circuit is simple and can simultaneously support the PV side and the power grid side to wake up the battery.

Description

Technical Field

[0001] The utility model belongs to the field of photovoltaic energy storage and relates to an energy storage inverter and a battery wake-up circuit thereof. Background Art

[0002] Portable energy storage inverters are integrated structures, containing an inverter and a battery pack. To prevent unnecessary energy consumption during long periods of inactivity or transportation, the battery pack's BMS controls the battery pack to enter a dormant state. Once dormant, the battery pack needs to be awakened. Existing energy storage inverters typically use complex circuitry to wake the battery, typically by powering on the grid and then waking up the battery through the wake-up circuit. PV-compatible wake-up methods often require complex circuitry and even more complex control logic. Furthermore, complex circuitry results in higher costs and larger size.

[0003] The above information disclosed in this Background section is only for enhancement of understanding of the background of the application and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Utility Model Content

[0004] In view of this, the utility model provides an improved energy storage inverter and a battery wake-up circuit thereof. The battery wake-up circuit is simple and can support battery wake-up on both the PV side and the grid side at the same time.

[0005] The utility model adopts the following technical solutions:

[0006] A battery wake-up circuit for an energy storage inverter, comprising:

[0007] A wake-up command input terminal, used to receive a wake-up command signal;

[0008] a switch, a control end of which is connected to the wake-up instruction input terminal;

[0009] an optocoupler, wherein a primary side of the optocoupler is connected to the switch, and a secondary side of the optocoupler is connected to the first power terminal;

[0010] The wake-up signal output terminal is connected to the secondary side of the optocoupler.

[0011] In some preferred embodiments, the battery wake-up circuit includes a first resistor connected between the wake-up instruction input terminal and the switch. The first resistor is specifically a current-limiting resistor.

[0012] In some preferred embodiments, the switch includes a transistor, the base of the transistor is connected to the wake-up instruction access terminal, the emitter of the transistor is grounded, the primary side of the optocoupler is connected between the collector of the transistor and a second power supply terminal, and the voltage of the second power supply terminal is less than the voltage of the first power supply terminal.

[0013] In some more preferred embodiments, the battery wake-up circuit further includes a second resistor connected between the second power terminal and the primary side of the optocoupler. Specifically, the primary side of the optocoupler includes a light-emitting diode, and the second resistor is a current-limiting resistor of the primary side of the optocoupler.

[0014] In some more preferred embodiments, the battery wake-up circuit further includes a filter capacitor and a third resistor, wherein the filter capacitor and the third resistor are connected in parallel, one end of which is connected to the base of the transistor and the other end is grounded. Specifically, the transistor is an NPN transistor; the first resistor is the base current limiting resistor of the NPN transistor; the filter capacitor is the base filter capacitor of the NPN transistor; and the third resistor is the base pull-down resistor of the NPN transistor.

[0015] In some preferred embodiments, the first end of the secondary side of the optocoupler is connected to the first power terminal, the second end of the secondary side is grounded via a fourth resistor, and the wake-up signal output terminal is connected to the second end of the secondary side.

[0016] Specifically, the secondary side of the optocoupler includes a light detector, and the fourth resistor is a current-limiting resistor of the secondary side of the optocoupler.

[0017] The utility model also adopts the following technical solutions:

[0018] An energy storage inverter includes an inverter module and a battery module. The energy storage inverter also includes the battery wake-up circuit. The wake-up instruction access terminal is connected to the controller of the inverter module, and the wake-up signal output terminal is connected to the battery module.

[0019] In some preferred embodiments, the controller includes an MCU chip, and the wake-up signal output terminal is connected to the GPIO pin of the MCU chip; the inverter module also includes a DC auxiliary source for drawing power from the photovoltaic panel and an AC auxiliary source for drawing power from the power grid, and the DC auxiliary source and the AC auxiliary source are connected to the main auxiliary source, and the main auxiliary source and the controller are connected to power the controller.

[0020] In some preferred embodiments, the battery wake-up circuit is provided in the inverter module.

[0021] In some preferred embodiments, the battery module includes a battery monitoring chip, and the wake-up signal output terminal is connected to the LD pin of the battery monitoring chip via an isolation chip.

[0022] The utility model adopts the above solution and has the following advantages:

[0023] The battery wake-up circuit of this utility model uses a switch and an optocoupler. After receiving a wake-up command signal, it can send a wake-up signal (e.g., a high-level signal) to the battery module through the wake-up signal output terminal to wake the battery module. The circuit itself has a simple structure, reducing circuit cost and size. At the same time, the wake-up command input terminal can receive wake-up commands from the PV side or the grid side, supporting both the PV side and the grid side to wake up the battery. The energy storage inverter of this utility model sends a wake-up command signal to the battery wake-up circuit through the inverter module, supporting both the PV side and the grid side to wake up the battery; and the circuit structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 The figure is a structural block diagram of an energy storage inverter according to an embodiment of the present utility model.

[0026] Figure 2 The figure is a circuit diagram of a battery wake-up circuit according to an embodiment of the present utility model.

[0027] Figure 3 The figure is a battery wake-up logic control block diagram of the energy storage inverter according to an embodiment of the present utility model.

[0028] Among them, 1. Inverter module; 11. DC auxiliary power source; 12. AC auxiliary power source; 13. Main and auxiliary power sources; 14. MCU chip; 15. Battery wake-up circuit; 151. Wake-up command input terminal; 152. Primary side; 153. Secondary side; 154. First power terminal; 155. Second power terminal; 156. Wake-up signal output terminal;

[0029] 2. Battery module; 21. Isolation chip; 22. Battery monitoring chip; 23. MCU chip; 24. Battery pack. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art. It should be noted that the description of these embodiments is intended to help understand the present invention, but does not constitute a limitation of the present invention.

[0031] This embodiment provides an energy storage inverter and a battery wake-up circuit for the energy storage inverter. Figure 1 As shown, the energy storage inverter includes an inverter module 1 and a battery module 2. The inverter module 1 includes a DC auxiliary source 11, an AC auxiliary source 12, a main auxiliary source 13, and a controller. The DC auxiliary source 11 is connected to the photovoltaic panel PV and the battery to draw power from the photovoltaic panel and the battery. The AC auxiliary source 12 is connected to the power grid to draw power from the power grid. The main auxiliary source 13 is connected to the DC auxiliary source 11 and the AC auxiliary source 12. The controller is specifically an MCU chip 14, which is connected to the main auxiliary source 13 to be powered by the main auxiliary source 13. The battery module 2 includes an isolation chip 21, a battery monitoring chip 22, an MCU chip 23, and a battery pack 24. The battery wake-up circuit 15 is connected between the MCU chip 14 of the inverter module 1 and the isolation chip 21 of the battery module 2. The battery wake-up circuit 15 is integrated in the inverter module 1, for example, integrated with the MCU chip 14 and the like and arranged on the same PCB.

[0032] Reference Figure 2 As shown, the battery wake-up circuit 15 of the energy storage inverter includes a wake-up instruction access terminal 151, a switch, an optocoupler U1 and a wake-up signal output terminal 156. The wake-up instruction access terminal 151 is used to receive the wake-up instruction signal; specifically in this embodiment, the wake-up signal output terminal 156 is connected to the GPIO pin of the MCU chip 14. The control end of the switch is connected to the wake-up instruction access terminal 151. The optocoupler U1, specifically an isolation optocoupler, includes a primary side 152 and a secondary side 153 that are isolated from each other. The primary side 152 includes a light-emitting diode, and the secondary side 153 includes a light detector, such as a phototransistor. Among them, the primary side 152 of the optocoupler U1 is connected to the switch, and the secondary side 153 of the optocoupler U1 is connected to the first power supply terminal 154. The wake-up signal output terminal 156 is connected to the secondary side 153 of the optocoupler U1; in addition, the wake-up signal output terminal 156 is connected to the LD pin of the battery monitoring chip 22 through an isolation chip 21. When the wake-up command signal is input, the switch is closed, the primary side 152 of the optocoupler U1 is turned on, and the secondary side 153 is controlled to be turned on accordingly, and the output voltage of the wake-up signal output terminal 156 becomes the voltage input by the first power terminal 154, for example, 7V.

[0033] The switch includes a transistor Q1. The base of transistor Q1 is connected to the wake-up command input terminal 151, and the emitter of transistor Q1 is grounded. The primary side 152 of optocoupler U1 is connected between the collector of transistor Q1 and a second power terminal 155. The voltage of second power terminal 155 is lower than the voltage of first power terminal 154. In this embodiment, transistor Q1 is an NPN transistor. The input voltage of first power terminal 154 is 7V, and the input voltage of second power terminal 155 is 5V.

[0034] The battery wake-up circuit 15 includes a first resistor R1 connected between the wake-up command input terminal 151 and the switch. The first resistor R1 is specifically a base current-limiting resistor of the NPN transistor Q1. The battery wake-up circuit 15 also includes a second resistor R2 connected between the second power terminal 155 and the primary side 152 of the optocoupler U1. Specifically, the second resistor R2 is a current-limiting resistor of the primary side 152 of the optocoupler U1.

[0035] The battery wake-up circuit 15 also includes a filter capacitor C1 and a third resistor R3. The filter capacitor C1 and the third resistor R3 are connected in parallel, with one end connected to the base of the transistor Q1 and the other end grounded. Specifically, the first resistor R1 is the base current-limiting resistor of the NPN transistor Q1; the filter capacitor C1 is the base filter capacitor C1 of the NPN transistor Q1; and the third resistor R3 is the base pull-down resistor of the NPN transistor Q1.

[0036] The first end of the secondary side 153 of the optocoupler U1 is connected to the first power terminal 154, the second end of the secondary side 153 is grounded, and the wake-up signal output terminal 156 is connected to the second end of the secondary side 153. Furthermore, the second end of the secondary side 153 is grounded via a fourth resistor R4. Specifically, the secondary side 153 of the optocoupler U1 includes a light detector, and the fourth resistor R4 serves as a current-limiting resistor for the secondary side 153 of the optocoupler U1.

[0037] Combine Figure 3 As shown, after the auxiliary power source of the portable energy storage inverter is powered on, if it fails to communicate with the battery module 2 after 15 seconds or the APP issues a wake-up command, it will enter the battery wake-up mode. The GPIO of the MCU chip 14 of the control module of the portable energy storage inverter, which is used to drive the battery wake-up function, will send a high-level signal DSP_WAKE_ON (wake-up command signal), which will pass through the current limiting resistor R1 and drive the NPN transistor Q1 to turn on. After the NPN transistor Q1 is turned on, the current of the second power terminal 155 passes through the resistor R2, flows through the primary side 152 diode of the optocoupler U1, and is output to the emitter of the NPN transistor Q1 through the NPN transistor Q1. The primary side 152 of the optocoupler U1 is turned on, which controls the secondary side 153 to turn on, thereby connecting to the first power terminal 154, and the voltage of the wake-up signal output terminal 156 becomes approximately 7V. The wake-up signal passes through the isolation chip 21 within battery module 2's BMS to the LD pin of the AFE battery monitoring chip 22 in battery module 2. When the LD pin voltage exceeds the set value, the internal comparator output level flips, and the AFE battery monitoring chip 22 exits sleep mode. After the AFE monitoring chip exits sleep mode, all monitoring and power circuits resume, and power begins to be supplied to the MCU chip 14 in battery module 2. After powering on, the MCU chip 14 in battery module 2 receives various cell BAT data from the AFE battery monitoring chip 22. Upon successful self-test, it issues a command to close the charge and discharge MOSFETs, completing the battery wake-up.

[0038] The wake-up principle of the battery wake-up circuit 15 in this embodiment is as follows: inverter module 1 can be powered via the PV side or the grid side. Inverter module 1 partially issues a wake-up command signal, driving the battery wake-up circuit 15 to output a wake-up signal. The wake-up signal is then connected to the battery management system (BMS) of battery module 2 and transmitted through an isolation circuit to the LD pin of the AFE battery monitoring chip 22. The internal AFE battery monitoring chip 22 of battery module 2 monitors the wake-up signal. When battery module 2 is in sleep mode, applying a voltage higher than a set voltage to the LD pin of the AFE battery monitoring chip 22 triggers a comparator flip-flop within the battery monitoring chip 22, causing battery module 2 to exit sleep mode.

[0039] The energy storage inverter and its battery wake-up circuit 15 in this embodiment use a single circuit to simultaneously wake up the battery on either the PV side or the grid side. By adding two key components, transistor Q1 and optocoupler U1, to the inverter module 1, the wake-up circuit is simple, low-cost, and compact.

[0040] As used in this specification and claims, the terms "comprises" and "include" merely indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list; a method or apparatus may also include other steps or elements. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0041] It is further understood that, in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar thereto.

[0042] It should be noted that, unless otherwise specified, when a feature is referred to as being “connected” to another feature, it may be directly connected to the other feature or indirectly connected to the other feature.

[0043] The above embodiment is intended only to illustrate the technical concept and features of the present invention and is a preferred embodiment. Its purpose is to enable those familiar with the art to understand the content of the present invention and implement it accordingly. It is not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made based on the principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A battery wake-up circuit for an energy storage inverter, characterized in that: include: A wake-up command input terminal, used to receive a wake-up command signal; a switch, a control end of which is connected to the wake-up instruction input terminal; an optocoupler, wherein a primary side of the optocoupler is connected to the switch, and a secondary side of the optocoupler is connected to the first power terminal; The wake-up signal output terminal is connected to the secondary side of the optocoupler.

2. The battery wake-up circuit according to claim 1, characterized in that: The battery awakening circuit includes a first resistor connected between the awakening instruction input terminal and the switch.

3. The battery wake-up circuit according to claim 1, characterized in that: The switch includes a transistor, the base of the transistor is connected to the wake-up instruction access terminal, the emitter of the transistor is grounded, the primary side of the optocoupler is connected between the collector of the transistor and a second power supply terminal, and the voltage of the second power supply terminal is less than the voltage of the first power supply terminal.

4. The battery wake-up circuit according to claim 3, characterized in that: The battery wake-up circuit further includes a second resistor connected between the second power terminal and the primary side of the optocoupler.

5. The battery wake-up circuit according to claim 3, characterized in that: The battery wake-up circuit further includes a filter capacitor and a third resistor. After the filter capacitor and the third resistor are connected in parallel, one end is connected to the base of the transistor and the other end is grounded.

6. The battery wake-up circuit according to claim 1, characterized in that: A first end of the secondary side of the optocoupler is connected to the first power terminal, a second end of the secondary side is grounded via a fourth resistor, and the wake-up signal output terminal is connected to the second end of the secondary side.

7. An energy storage inverter, comprising an inverter module and a battery module, characterized in that: The energy storage inverter further includes the battery wake-up circuit according to any one of claims 1 to 6, the wake-up instruction access terminal is connected to the controller of the inverter module, and the wake-up signal output terminal is connected to the battery module.

8. The energy storage inverter according to claim 7, characterized in that: The controller includes an MCU chip, and the wake-up signal output terminal is connected to the GPIO pin of the MCU chip; the inverter module also includes a DC auxiliary source for drawing power from the photovoltaic panel and an AC auxiliary source for drawing power from the power grid, the DC auxiliary source and the AC auxiliary source are connected to the main auxiliary source, and the main auxiliary source and the controller are connected to power the controller.

9. The energy storage inverter according to claim 7, characterized in that: The battery wake-up circuit is arranged in the inverter module.

10. The energy storage inverter according to claim 7, characterized in that: The battery module includes a battery monitoring chip, and the wake-up signal output terminal is connected to the LD pin of the battery monitoring chip through an isolation chip.

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