Inverter module output voltage regulation circuit and energy storage system

Abstract

The present application relates to an inverter module output voltage regulation circuit and an energy storage system. The circuit includes: a voltage detection module, an inverter module, a main control module and a trigger module; the trigger module is used to output a heavy load indication signal to the main control module when the output current of the inverter module supplying power to the load is greater than the preset current threshold; the main control module is used to send a pulse signal of a first duty cycle to the reference voltage generation module based on the heavy load indication signal, wherein the first duty cycle is greater than the second duty cycle in the non-heavy load working mode; the voltage detection module is used to determine the detection output voltage based on the pulse signal sent by the main control module and the actual output voltage of the inverter module; the main control module is also used to determine the target output voltage based on the detection output voltage, and adjust the output voltage of the inverter module based on the target output voltage, wherein the target output voltage is less than the detection output voltage. The use of this circuit can improve the load-carrying capacity of the inverter module.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage power supply, and in particular to an inverter module output voltage regulation circuit and an energy storage system. Background Art

[0002] In the current application scenarios of inverter module technology, its performance has obvious defects when facing heavy load conditions. The existing inverter modules are insufficient in load capacity. Once connected to a heavy load, it is difficult to drive the load normally, and the fault alarm mechanism will be triggered immediately. This fault not only affects the stable operation of the inverter module itself, but also greatly limits the effective application of the inverter module in related fields with high load capacity requirements. Summary of the invention

[0003] Based on this, it is necessary to provide an inverter module output voltage regulation circuit and an energy storage system to address the above technical problems, which can improve the load capacity of the inverter module.

[0004] In a first aspect, the present application provides an inverter module output voltage regulation circuit, the circuit comprising: a voltage detection module, an inverter module, a main control module and a trigger module;

[0005] The trigger module is used to output a heavy load indication signal to the main control module when the output current of the inverter module supplying power to the load is greater than a preset current threshold;

[0006] The main control module is used to send a pulse signal with a first duty cycle to the voltage detection module based on the heavy load indication signal, wherein the first duty cycle is greater than the second duty cycle in the non-heavy load working mode;

[0007] The voltage detection module is used to determine the detection output voltage based on the pulse signal sent by the main control module and the actual output voltage of the inverter module;

[0008] The main control module is further used to determine a target output voltage based on the detected output voltage, and adjust the output voltage of the inverter module based on the target output voltage, wherein the target output voltage is lower than the detected output voltage.

[0009] In a second aspect, the present application further provides an energy storage system, comprising an inverter module output voltage regulation circuit as described in the first aspect.

[0010] The above inverter module output voltage regulation circuit includes: a voltage detection module, an inverter module, a main control module and a trigger module; the trigger module is used to output a heavy load indication signal to the main control module when the output current of the inverter module supplying power to the load is greater than the preset current threshold; the main control module is used to send a pulse signal of a first duty cycle to the voltage detection module based on the heavy load indication signal, wherein the first duty cycle is greater than the second duty cycle in the non-heavy load working mode; the voltage detection module is used to determine the detection output voltage based on the pulse signal sent by the main control module and the actual output voltage of the inverter module; the main control module is also used to determine the target output voltage based on the detection output voltage, and adjust the output voltage of the inverter module based on the target output voltage, wherein the target output voltage is less than the detection output voltage. Through this circuit, the intelligent and precise control of the output voltage of the inverter module can be achieved. When facing a heavy load condition, the trigger module can capture the current overload information and feed it back to the main control module, and the main control module immediately changes the pulse signal duty cycle, thereby using the voltage detection module to indirectly sense the circuit state change, further determine the target output voltage adapted to the heavy load and adjust the inverter module output. In this way, under heavy load scenarios, the modules inside the inverter module work together to optimize the power distribution strategy, reduce the risk of failure due to overload, enhance the overall robustness and stability of the system, and effectively expand the load types and ranges that the inverter module can adapt to. It greatly improves the load-carrying capacity of the inverter module in complex load environments, so that it can operate stably and reliably whether it is responding to fluctuations in electricity demand of various large-scale equipment in the industrial field or meeting changes in power supply when multiple household appliances are running at the same time, providing solid guarantees for power supply and significantly improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 A schematic diagram of an inverter module output voltage regulation circuit Figure 1 ;

[0013] Figure 2 A schematic diagram of an inverter module output voltage regulation circuit Figure 2 ;

[0014] Figure 3 is a structural schematic diagram of the reference voltage generating unit 111;

[0015] Figure 4is a schematic diagram of the structure of the detection unit 112;

[0016] Figure 5 Schematic diagram of the structure of the trigger module 14. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0018] In the current application scenarios of inverter module technology, its performance has obvious defects when facing heavy load conditions. The existing inverter modules are insufficient in load capacity. Once connected to a heavy load, it is difficult to drive the load normally, and the fault alarm mechanism will be triggered immediately. This fault not only affects the stable operation of the inverter module itself, but also greatly limits the effective application of the inverter module in related fields with high load capacity requirements.

[0019] In order to solve the above problems, an embodiment of the present application provides an inverter module output voltage regulation circuit and an energy storage system. When the system is connected to a large load, which exceeds its own specifications, the system detects that the output current exceeds the preset current threshold. The output power can be kept constant by lowering the output voltage, thereby driving a load larger than its own specifications and improving the load-carrying capacity of the inverter module.

[0020] In an exemplary embodiment, Figure 1 As shown, a schematic diagram of an inverter module output voltage regulation circuit is provided. Figure 1 The circuit includes: a voltage detection module 11, an inverter module 12, a main control module 13 and a trigger module 14; the trigger module 14 is used to output a heavy load indication signal to the main control module 13 when the output current supplied by the inverter module 12 to the load is greater than a preset current threshold; the main control module 13 is used to send a pulse signal with a first duty cycle to the voltage detection module 11 based on the heavy load indication signal, wherein the first duty cycle is greater than the second duty cycle in the non-heavy load working mode; the voltage detection module 11 is used to determine the detection output voltage based on the pulse signal sent by the main control module 13 and the actual output voltage of the inverter module 12; the main control module 13 is also used to determine the target output voltage based on the detection output voltage, and adjust the output voltage of the inverter module based on the target output voltage.

[0021] The target output voltage is less than the detection output voltage.

[0022] In some embodiments, the trigger module 14 is also used to output a non-overload indication signal to the main control module when the output current supplied by the inverter module to the load is less than or equal to a preset current threshold; the main control module 13 is also used to send a pulse signal with a second duty cycle to the voltage detection module 11 based on the non-overload indication signal.

[0023] The first duty cycle is the duty cycle of the pulse signal sent by the main control module to the voltage detection module when the circuit is in the heavy load working mode, and the second duty cycle is the corresponding duty cycle of the pulse signal in the non-heavy load working mode. The first duty cycle is greater than the second duty cycle, which means that when the circuit is heavy load, the main control module will change some related voltage parameters by adjusting the duty cycle of the pulse signal, thereby realizing the subsequent regulation of the output voltage of the inverter module.

[0024] Exemplarily, the main control module may be a central processing unit (CPU), which may send out a 3.3V pulse signal.

[0025] The above-mentioned detected output voltage is a value reflecting the actual situation of the current circuit voltage obtained by the voltage detection module based on the pulse signal sent by the main control module and the actual output voltage of the inverter module after internal specific calculations or circuit processing. It is the basic data for the main control module to further determine the target output voltage.

[0026] The above target output voltage is the output voltage value that the main control module expects the inverter module to reach, calculated according to a certain control algorithm or preset rules based on the detected output voltage fed back by the voltage detection module. This value will be lower than the detected output voltage. The purpose is to ensure that the inverter module can operate stably to drive the load by appropriately reducing the output voltage under heavy load conditions, avoiding problems such as failures due to overload, and also achieving the purpose of reasonable power supply to the load.

[0027] For example, the above Figure 1In the implementation process of the circuit shown, during the normal operation of the circuit, the trigger module 14 always monitors the output current of the inverter module 12 supplying power to the load. Once the value of the output current exceeds the preset current threshold, the trigger module determines that the circuit enters the overload state, and then sends a heavy load indication signal to the main control module 13. For example, assuming that the preset current threshold is 5A, when the trigger module detects that the output current reaches 6A, this signal sending mechanism will be triggered. After receiving the heavy load indication signal from the trigger module 14, the main control module 13 will send a pulse signal with a first duty cycle to the voltage detection module 11. This first duty cycle is greater than the second duty cycle in the non-overload working mode. For example, when the second duty cycle is set to 30% in the non-overload state, when the heavy load indication signal is received in the overload state, the main control module will adjust the duty cycle to the first duty cycle of 50% (only an example value). By changing the duty cycle, it is equivalent to changing the control signal transmitted to the voltage detection module, thereby affecting the subsequent voltage detection and regulation process. After receiving the pulse signal sent by the main control module 13 and knowing the actual output voltage of the inverter module 12 (such as 220 V), the voltage detection module 11 uses its internal circuit structure and related operation logic to determine a detection output voltage that can reflect the actual voltage situation of the current circuit. For example, based on the received specific duty cycle pulse signal and the actual output voltage, after a series of calculations and processing, it is obtained that the detection output voltage is 230 V (only an example value). The main control module 13 determines the target output voltage and adjusts the inverter module output voltage: After the main control module 13 obtains the detection output voltage (such as the above-mentioned 230 V) fed back by the voltage detection module 11, it calculates the target output voltage according to a pre-set control algorithm or rule, and this target output voltage is less than the detection output voltage. Assume that the calculated target output voltage is 210 V. Then, the main control module will adjust the output voltage of the inverter module 12 through the corresponding control circuit, so that its actual output voltage gradually approaches and stabilizes at the target output voltage 210 V, thereby achieving effective regulation of the inverter module output voltage under heavy load conditions and ensuring that the circuit can operate stably under load.

[0028] Through the above Figure 1 The circuit shown can realize intelligent and precise control of the output voltage of the inverter module.

[0029] When facing heavy load conditions, the trigger module can capture the current overload information and feed it back to the main control module. The main control module then changes the duty cycle of the pulse signal, thereby using the voltage detection module to indirectly sense the change in circuit state, further determine the target output voltage adapted to the heavy load, and adjust the inverter module output. In this way, in heavy load scenarios, the modules inside the inverter module work together to optimize the distribution strategy of electric energy, reduce the risk of failures caused by overload, enhance the overall robustness and stability of the system, and effectively expand the load types and ranges that the inverter module can adapt to, greatly improving the load-carrying capacity of the inverter module in complex load environments, so that it can operate stably and reliably, whether it is to cope with fluctuations in electricity demand of various large-scale equipment in the industrial field, or to meet the changes in power supply when multiple household appliances are running at the same time, providing solid guarantees for power supply and significantly improving the user experience.

[0030] In some embodiments, in the above Figure 1 On the basis of Figure 2 As shown, a schematic diagram of an inverter module output voltage regulation circuit is provided. Figure 2 , Figure 2 The medium voltage detection module 11 includes: a reference voltage generation unit 111 for generating a reference voltage based on a pulse signal sent by the main control module 13; and a detection unit 112 for determining the detection output voltage based on the reference voltage and the actual output voltage of the inverter module 12.

[0031] In the inverter module output voltage regulation circuit shown in FIG2 , the voltage detection module 11 includes a reference voltage generation unit 111 and a detection unit 112. The reference voltage generation unit 111 generates a reference voltage based on a pulse signal sent by the main control module 13, and the detection unit 112 further detects based on the reference voltage, determines the detected output voltage based on the reference voltage and the actual output voltage of the inverter module 12, and transmits it to the main control module 13, so that the main control module 13 determines the target output voltage and adjusts the output voltage of the inverter module 12, and each part synergistically participates in the voltage regulation process of the entire circuit.

[0032] The circuit structure of Figure 2 above makes the division of labor of the voltage detection module clearer, which helps to generate the reference voltage and determine the target output voltage more accurately, thereby optimizing the regulation process of the output voltage of the entire inverter module, improving the accuracy of the circuit's output voltage regulation under different load conditions, ensuring the stable operation of the inverter module, and enhancing its load-carrying capacity and adaptability to complex power usage scenarios.

[0033] In some embodiments, Figure 3 is a schematic diagram of the structure of the reference voltage generating unit 111. Figure 3As shown, the reference voltage generating unit 111 includes: a voltage divider rectifier unit and a voltage follower U1C; wherein the voltage divider rectifier unit is used to rectify and divide the pulse signal of the first duty cycle to obtain an intermediate voltage, and input the intermediate voltage to the voltage follower U1C; the voltage follower U1C is used to generate a reference voltage equal to the intermediate voltage.

[0034] In some embodiments, the voltage-dividing rectifier unit includes: a seventh resistor R7, a tenth resistor R10 and a sixth capacitor C6; one end of the seventh resistor R7 is connected to the pulse signal output terminal 3.3V_CPU of the main control module and one end of the sixth capacitor C6, and the other end of the seventh resistor R7 is connected to the positive input terminal of the voltage follower U1C (i.e. Figure 3 The pin 10 of U1C in the middle) and one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to the other end of the sixth capacitor C6 and the ground terminal GND; wherein the negative input terminal of the voltage follower U1C (ie Figure 3 Pin 9 of U1C) and the output terminal of voltage follower U1C (i.e. Figure 3 The reference voltage generating unit 111 is connected to the pin 8 of U1C in the circuit and serves as the output terminal of the reference voltage generating unit 111 to output the reference voltage VRef.

[0035] in, Figure 3 The 3.3V_CPU in it means that the pulse signal output by the main control module is a 3.3V pulse signal.

[0036] In some embodiments, the reference voltage generating unit may further include: Figure 3 As shown in FIG. 1 , a second capacitor C2 , a third capacitor C3 , a fourth capacitor C4 and a fifth capacitor C5 , and a fourth resistor R4 and a fifth resistor R5 .

[0037] In the reference voltage generation unit structure shown in FIG3 , the pulse signal with the first duty cycle output by the main control module first enters the voltage-dividing rectifier subunit, and the seventh resistor R7, the tenth resistor R10 and the sixth capacitor C6 in the subunit work together to rectify and divide the pulse signal, convert it into an intermediate voltage, and then input the intermediate voltage to the voltage follower U1C. The voltage follower U1C has a special connection method, and its negative input terminal is connected to the output terminal, so that it can play the role of voltage following, generate a reference voltage VRef equal to the input intermediate voltage, and output the reference voltage from its output terminal to provide a reference reference for subsequent related circuits.

[0038] For example, assuming that the main control module (CPU) sends a 3.3V pulse signal, which is sent to the voltage follower U1C through the above-mentioned voltage divider rectifier unit, the calculation formula of the output reference voltage VRef can be expressed as the following formula (1):

[0039] VRef=3.3V*Duty*R7 / (R7+R10) (1)

[0040] Among them, in the heavy-load working mode, the main control module will increase the duty cycle (Duty) of the 3.3V pulse signal. As the Duty increases, the output voltage VRef will also increase.

[0041] The structure of Figure 3 realizes the accurate conversion of the pulse signal of the main control module into a stable reference voltage through the cooperation of the voltage-dividing rectifier unit and the voltage follower, providing a reliable voltage reference for the output voltage regulation circuit of the entire inverter module. The reasonable setting of each resistor and capacitor element helps to optimize the signal processing process, improve the stability and accuracy of the voltage, and reduce interference, thereby ensuring that the subsequent voltage detection, regulation and other operations based on the reference voltage can be carried out more accurately and effectively, and improving the reliability of the operation of the entire circuit system and the accuracy of the output voltage control.

[0042] In some embodiments, Figure 4 1 is a schematic diagram of the structure of the detection unit 112. The detection unit 112 includes: a first operational amplifier U1D, a positive input terminal of the first operational amplifier U1D (i.e. Figure 4 The pin 12 of U1D in the figure is connected to the output end of the reference voltage generating unit (the signal output by the output end is the reference voltage VRef) and the positive output end of the inverter module 12 (i.e. Figure 4 In the figure, V_INV+ is represented as the negative input terminal of the first operational amplifier (i.e. Figure 4 Pin 13 of U1D is connected Figure 2 The negative output terminal of the inverter module 12 (i.e. Figure 4 In the figure, it is represented as V_INV-), the output terminal of the first operational amplifier U1D (i.e. Figure 4 Connect the pin 14 of U1D to the Figure 2 The main control module 13 in.

[0043] In the circuit structure of the detection unit 112 shown in FIG4 , the first operational amplifier U1D plays a key role. Its positive input terminal is connected to the reference voltage VRef output by the reference voltage generation unit. This reference voltage is an important reference value for the entire detection comparison. The positive input terminal of the first operational amplifier U1D is connected to the output terminal of the reference voltage generation unit, and the negative input terminal of the first operational amplifier is connected to the reference voltage VRef output by the reference voltage generation unit. Figure 2The first operational amplifier U1D is connected to the negative output terminal of the inverter module 12, so that the first operational amplifier U1D can compare the reference voltage VRef with the actual output voltage of the inverter module 12. When there is a difference between the two voltages, the first operational amplifier U1D will amplify the difference according to its own amplification characteristics, and output a corresponding signal from its output terminal (pin 14) to the main control module 13 in Figure 2.

[0044] For example, Figure 4 As shown in FIG. 2 , the main control module 13 in FIG. 2 can adjust the output voltage by detecting the output voltage sampling value of the inverter module 12. The reference voltage VRef is connected to the positive input terminal of the first operational amplifier U1D. The detected output voltage output by the first operational amplifier U1D can be expressed as the following formula (2):

[0045] V_INV= Vo * (R9 / R6) + VRef (2)

[0046] Wherein, Vo represents the actual output voltage. In the heavy load working mode, because Duty increases, VRef is too large, so that V_INV is too large. After the main control module 13 in FIG2 detects this value, it adjusts the duty cycle to reduce the output voltage of the inverter module 12, thereby achieving the purpose of reducing the output voltage when carrying heavy load.

[0047] In some embodiments, Figure 4 As shown, the detection unit 112 may further include a first resistor R1, a second resistor R2, a sixth resistor R6, a ninth resistor R9, a first capacitor C1 and a seventh capacitor C7.

[0048] Figure 4 The components including the first resistor R1, the second resistor R2, the sixth resistor R6, the ninth resistor R9, the first capacitor C1 and the seventh capacitor C7 will assist the entire circuit in its operation. For example, the resistors may be involved in setting the amplification factor and voltage division of the first operational amplifier U1D, while the capacitors may play a filtering role, thereby ensuring the stability of the voltage signal input to the first operational amplifier U1D and the accuracy of the output signal, thereby making the entire detection process more reliable.

[0049] In some embodiments, Figure 5 is a schematic diagram of the structure of the trigger module 14, as shown in Figure 5 As shown, the trigger module 14 includes: an operational amplifier unit, a control signal output unit and a signal control module; wherein the operational amplifier unit is used to sample the output current of the inverter module 12 supplying power to the load; the control signal output unit is used to Figure 2 When the output current of the inverter module 12 in the inverter module 12 supplied to the load is greater than the preset current threshold, a first control signal is output; Figure 2 When the output current supplied to the load by the inverter module 12 is less than or equal to a preset current threshold, a second control signal is output; a signal control module is used to output a heavy load indication signal based on the first control signal and a non-heavy load indication signal based on the second control signal.

[0050] In some embodiments, Figure 5 It is shown in FIG. 1 that the control signal output unit includes: a first comparator U2A and a second comparator U2B, and the signal control module includes: a first transistor Q1.

[0051] Among them, the negative input terminal of the first comparator U2A (i.e. Figure 5 Pin 2 of U2A in the circuit is connected to the first preset voltage terminal, and the positive input terminal of the first comparator U2A (i.e. Figure 5 Pin 3 of U2A is connected to the input terminal of the control signal output unit Figure 2 The output end of the inverter module 12, the output end of the first comparator U2A (ie Figure 5 Pin 1 of U2A is connected to the control terminal of the first transistor Q1 (i.e. Figure 5 Pin 1 of Q1 in the middle); the negative input terminal of the second comparator U2B (i.e. Figure 5 Pin 6 of U2B) connects the positive input of the first comparator U2A and Figure 2 The output end of the inverter module 12, the positive input end of the second comparator U2B (ie Figure 5 Pin 5 of U2B in the circuit is connected to the second preset voltage terminal, and the output terminal of the second comparator U2B (i.e. Figure 5 Pin 7 of U2B in the figure is connected to the control end of the first transistor Q1; the first end of the first transistor Q1 (i.e. Figure 5 Pin 3 of Q1 in the figure is connected to the third preset voltage terminal and serves as the output terminal of the signal control module to output a heavy load indication signal or a non-heavy load indication signal (i.e. Figure 5 Indicated as OCP_INV in the figure, the second end of the first transistor (i.e. Figure 5 Pin 2 of Q1 is grounded.

[0052] in, Figure 5 The signals connected to the first preset voltage terminal, the second preset voltage terminal and the third preset voltage terminal are all 3.3VA. Figure 5 The 3.3VA here means the power supply voltage is 3.3 volts (V).

[0053] Figure 5 In normal operation, Figure 2 The output current of the inverter module 12 supplying power to the load is less than or equal to the preset current threshold, Figure 5The OCP_INV output in is a high level signal (i.e. the above non-heavy load indication signal). When it is overloaded, Figure 2 The output current supplied to the load by the inverter module 12 is greater than the preset current threshold, Figure 5 OCP_INV is a low level signal (i.e. the above-mentioned overload indication signal). Figure 2 When the main control module 13 detects that OCP_INV is a low level signal, the value of the reference voltage VRef can be raised by adjusting the duty cycle of the 3.3V pulse, so that the V_INV value detected and output by the voltage detection module 11 is increased, and then Figure 2 The main control module 13 in the inverter detects the value of V_INV and adjusts the inverter output. Figure 2 The output voltage of the inverter module 12 is reduced, thereby increasing Figure 2 The inverter module 12 has heavy load capacity.

[0054] Above Figure 5 In the case of no overload, the output current I_INV of the inverter module is not overloaded. The voltage is connected to the positive input terminal of the first comparator U2A (i.e., pin 3 of U2A), and is also connected to the negative input terminal of the second comparator U2B (i.e., pin 6 of U2B). At this time, the voltage at the negative input terminal of the first comparator U2A (i.e., pin 2 of U2A) is greater than the voltage at the positive input terminal of the first comparator U2A, and the first comparator U2A outputs a low-level signal; the voltage at the negative input terminal of the second comparator U2B is greater than the voltage at the positive input terminal of the second comparator U2B (i.e., pin 5 of U2B), so the second comparator U2B also outputs a low-level signal. Since pin 1 of the first comparator U2A and pin 7 of the second comparator both output low-level signals at this time, pin 1 of the first transistor Q1 is at a low level, and Q1 is not conducting. Figure 5 The OCP_INV outputted in is a high level signal, that is, the above-mentioned non-heavy load indication signal.

[0055] Above Figure 5 In the example, when the inverter module is overloaded, the output current I_INV of the inverter module is overloaded. At this time, the voltage of pin 3 of the first comparator U2A is greater than the voltage of pin 2, or the voltage of pin 5 of the second comparator U2B is greater than the voltage of pin 6. That is, when overloaded, a comparator will have a positive input voltage greater than the negative input voltage, and the comparator will output a high-level signal, so that the first transistor Q1 at the back end is turned on. Figure 5 The OCP_INV outputted in is a low level signal, namely the above-mentioned heavy load indication signal.

[0056] In some embodiments, in some embodiments, Figure 5 It is shown in FIG. 5 that the operational amplifier unit includes a second operational amplifier U1A. Figure 5The numbers marked near the second operational amplifier U1A in FIG. 1 represent different pins. The positive input terminal of the second operational amplifier U1A is connected to Figure 2 The output positive terminal of the inverter module 12 is connected to the negative input terminal of the second operational amplifier U1A. Figure 2 The output negative end of the inverter module 12, the output end of the second operational amplifier U1A is connected to the input end of the control signal output unit (ie, the positive input end of the first comparator U2A, and the negative input end of the second comparator U2B).

[0057] In some embodiments, Figure 5 As shown, the trigger module 14 may also include Figure 5 The fourteenth resistor R14, the fifteenth resistor R15, the seventeenth resistor R17, the sixteenth resistor R16, the twentieth resistor R20, the eighth capacitor C8, the ninth capacitor C9, the fourteenth capacitor C14, the twelfth capacitor C12, the twelfth resistor R12, the eighteenth resistor R18, the thirteenth capacitor C13, the tenth capacitor C10, the twenty-second resistor R22, the twenty-third resistor R23, the sixteenth capacitor C16, the thirteenth resistor R13, the eleventh capacitor C11, the first diode D1, the nineteenth resistor R19, the twenty-first resistor R21, the fifteenth capacitor C15 and the second diode D2, the eleventh resistor R11.

[0058] Figure 5 The ground terminals in the figure are all represented as GND; +1.65 represents a positive voltage with an amplitude of 1.65 volts; +5V1 represents a positive voltage with an amplitude of 5 volts. I_INV+ represents the positive component of the output current of the inverter module 12, and I_INV- represents the negative component of the output current of the inverter module 12. Figure 5 The numbers marked at both ends of the first diode D1 and the second diode D2 in the figure represent different pins of the diodes.

[0059] Above Figure 5 In the structure shown, the output voltage of the inverter module 12 is compared with the preset voltage through the first comparator U2A and the second comparator U2B, and a corresponding level signal is output according to the comparison result, so as to distinguish whether the inverter module 12 is in normal operation (the output current is less than or equal to the preset current threshold) or in a heavy load state (the output current is greater than the preset current threshold), and output a corresponding non-heavy load indication signal (high level) or a heavy load indication signal (low level).

[0060] When a heavy load indication signal is detected (OCP_INV is a low level signal), the main control unit 13 in FIG. 2 can adjust the duty cycle of the 3.3V pulse and output it to the voltage detection module 11. The voltage detection module 11 can then raise the reference voltage VRef to increase the V_INV value of the detection output, thereby allowing the main control module 13 to adjust the output voltage of the inverter module 12, reduce the output voltage of the inverter module 12, and thereby enhance the load-carrying capacity of the inverter module 12.

[0061] Above Figure 5 Multiple components in the circuit shown (such as the second operational amplifier U1A and numerous resistors, capacitors, diodes, etc.) can assist the core components such as the first comparator U2A, the second comparator U2B and the first transistor Q1 to work, and optimize the signal processing process, such as signal amplification, filtering, voltage division, etc., to ensure that the circuit can stably and accurately output the indication signal under different load conditions, and ensure that the entire circuit system can effectively control the output of the inverter module according to the load conditions.

[0062] In some embodiments, an energy storage system is provided. The energy storage system may include the inverter module output voltage regulation circuit in the above embodiment.

[0063] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An inverter module output voltage regulation circuit, characterized in that: The circuit comprises: a voltage detection module, an inverter module, a main control module and a trigger module; The trigger module is used to output a heavy load indication signal to the main control module when the output current of the inverter module supplying power to the load is greater than a preset current threshold; The main control module is used to send a pulse signal with a first duty cycle to the voltage detection module based on the heavy load indication signal, wherein the first duty cycle is greater than the second duty cycle in the non-heavy load working mode; The voltage detection module is used to determine the detection output voltage based on the pulse signal sent by the main control module and the actual output voltage of the inverter module; The main control module is further used to determine a target output voltage based on the detected output voltage, and adjust the output voltage of the inverter module based on the target output voltage, wherein the target output voltage is lower than the detected output voltage.

2. The circuit according to claim 1, characterized in that The voltage detection module comprises: A reference voltage generating unit, used for generating a reference voltage based on the pulse signal sent by the main control module; The detection unit is used to determine the detection output voltage based on the reference voltage and the actual output voltage of the inverter module.

3. The circuit according to claim 2, characterized in that The reference voltage generating unit comprises: Voltage divider rectifier unit and voltage follower; The voltage-dividing rectifier unit is used to rectify and divide the pulse signal of the first duty cycle to obtain an intermediate voltage, and input the intermediate voltage to the voltage follower; The voltage follower is used to generate the reference voltage equal to the intermediate voltage.

4. The circuit according to claim 3, characterized in that The voltage-dividing rectifier unit comprises: a seventh resistor, a tenth resistor and a sixth capacitor; One end of the seventh resistor is connected to the pulse signal output end of the main control module and one end of the sixth capacitor, the other end of the seventh resistor is connected to the positive input end of the voltage follower and one end of the tenth resistor, and the other end of the tenth resistor is connected to the other end of the sixth capacitor and the ground end; The negative input terminal of the voltage follower is connected to the output terminal of the voltage follower.

5. The circuit according to claim 2, characterized in that The detection unit comprises: A first operational amplifier, wherein the positive input terminal of the first operational amplifier is connected to the output terminal of the reference voltage generating unit and the positive output terminal of the inverter module, the negative input terminal of the first operational amplifier is connected to the negative output terminal of the inverter module, and the output terminal of the first operational amplifier is connected to the main control module.

6. The circuit according to claim 1, characterized in that The trigger module is further configured to output a non-heavy load indication signal to the main control module when the output current of the inverter module supplying power to the load is less than or equal to a preset current threshold; The main control module is further used to send a pulse signal of the second duty cycle to the voltage detection module based on the non-heavy load indication signal.

7. The circuit according to claim 6, characterized in that The trigger module includes: an operational amplifier unit, a control signal output unit and a signal control module; The operational amplifier unit is used to sample the output current of the inverter module supplying power to the load; The control signal output unit is used to output a first control signal when the output current supplied by the inverter module to the load is greater than a preset current threshold; and output a second control signal when the output current supplied by the inverter module to the load is less than or equal to the preset current threshold; The signal control module is used to output the heavy load indication signal based on the first control signal, and output the non-heavy load indication signal based on the second control signal.

8. The circuit according to claim 7, characterized in that The operational amplifier unit comprises: A second operational amplifier, wherein the positive input terminal of the second operational amplifier is connected to the positive output terminal of the inverter module, the negative input terminal of the second operational amplifier is connected to the negative output terminal of the inverter module, and the output terminal of the second operational amplifier is connected to the input terminal of the control signal output unit.

9. The circuit according to claim 7, characterized in that The control signal output unit includes: a first comparator and a second comparator, and the signal control module includes: a first transistor; The negative input terminal of the first comparator is connected to the first preset voltage terminal, the positive input terminal of the first comparator is the input terminal of the control signal output unit, and the output terminal of the first comparator is connected to the control terminal of the first transistor; The negative input terminal of the second comparator is connected to the positive input terminal of the first comparator, the positive input terminal of the second comparator is connected to the second preset voltage terminal, and the output terminal of the second comparator is connected to the control terminal of the first transistor; The first end of the first transistor is connected to the third preset voltage end and serves as the output end of the signal control module, and the second end of the first transistor is grounded.

10. An energy storage system, characterized in that: It comprises the inverter module output voltage regulating circuit as claimed in any one of claims 1 to 9.

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