Inverter and energy recovery device thereof

Abstract

The utility model discloses an inverter and an energy recovery device thereof. The energy recovery device comprises a first energy recovery module and an energy storage module. The first energy recovery module comprises a thermoelectric power generation module and an energy recovery unit, the thermoelectric power generation module is adjacent to the inversion unit and connected with the energy recovery unit, and the energy recovery unit is connected with the energy storage module; the thermoelectric power generation module is used for outputting recovery current to the energy recovery unit when the inversion unit generates the temperature difference, and the energy recovery unit processes the recovery current and then charges the energy storage module. According to the technical scheme, a new energy recovery mode is provided for the inverter, the temperature difference generated in the working process of the inverter unit is effectively utilized and converted into electric energy, energy waste is reduced, energy is recovered and stored, the overall energy efficiency of the system is improved, the operation cost is reduced, meanwhile, waste heat emission is reduced, thermal pollution to the environment is reduced, and the energy-saving effect is achieved. And the method has obvious environmental protection benefits.

Description

Technical Field

[0001] The present application belongs to the field of power electronics technology, and in particular relates to an inverter and an energy recovery device thereof. Background Art

[0002] Inverter energy recovery technology aims to recycle or store excess energy generated during operation to improve overall energy efficiency. When the inverter is operating in braking or deceleration mode, the electric motor converts kinetic energy into electrical energy. This regenerated energy is typically fed back to the grid through an energy recovery system or stored in a battery for later use. However, current energy recovery methods are relatively simple, and current inverters generate significant losses during operation, wasting precious energy. Therefore, the market urgently needs to add additional energy recovery methods to address the above issues. Utility Model Content

[0003] The embodiments of the present invention provide an inverter and an energy recovery device thereof to solve the above-mentioned technical problems.

[0004] A first aspect of an embodiment of the present invention provides an energy recovery device for an inverter, wherein the inverter includes an inverter unit, and the energy recovery device includes: a first energy recovery module and an energy storage module;

[0005] The first energy recovery module includes a thermoelectric power generation module and an energy recovery unit, the thermoelectric power generation module is arranged adjacent to the inverter unit, the thermoelectric power generation module is connected to the energy recovery unit, and the energy recovery unit is connected to the energy storage module;

[0006] The thermoelectric power generation module is used to output a recovery current to the energy recovery unit when a temperature difference is generated in the inverter unit. The energy recovery unit charges the energy storage module after processing the recovery current.

[0007] Optionally, the energy recovery unit includes a first recovery control chip, a recovery switch module, a first step-down module, and a first feedback module, one end of the recovery switch module is connected to the thermoelectric power generation module, the other end of the recovery switch module is connected to one end of the first step-down module, the other end of the first step-down module is respectively connected to one end of the first feedback module and one end of the energy storage module, and the first recovery control chip is respectively connected to the control end of the recovery switch module and the other end of the first feedback module;

[0008] When the first recovery control chip detects the recovery current, it controls the recovery switch module to be turned on, and supplies power to the energy storage module after reducing the voltage through the first step-down module. The first recovery control chip also controls the conduction and shutdown of the recovery switch module according to the feedback signal of the first feedback module.

[0009] Optionally, the first step-down module includes a first inductor, a third diode and a second capacitor, one end of the first inductor and the cathode of the third diode are connected together as one end of the first step-down module, the other end of the first inductor and one end of the second capacitor are connected together as the other end of the first step-down module, and the anode of the third diode and the other end of the second capacitor are connected to a common ground.

[0010] Optionally, the first feedback module includes a second resistor and a fifth resistor, one end of the second resistor is one end of the first feedback module, the second end of the second resistor and the first end of the fifth resistor are connected together as the other end of the first feedback module, and the second end of the fifth resistor is grounded.

[0011] Optionally, the energy recovery device further includes a second energy recovery module, and the second energy recovery module is connected to the energy storage module;

[0012] The second energy recovery module is connected in series with at least one switch tube in the inverter unit. The second energy recovery module receives the leakage current output when the switch tube is turned off, processes the leakage current, and then charges the energy storage module.

[0013] Optionally, the second energy recovery module includes a second recovery control chip, a second step-down module, and a second feedback module, one end of the second recovery control chip is connected to one end of the switch tube in the inverter, the other end of the second recovery control chip is connected to one end of the second step-down module, the other end of the second step-down module is respectively connected to one end of the second feedback module and one end of the energy storage module, and the second recovery control chip is respectively connected to the other end of the second feedback module;

[0014] When the second recovery control chip receives the leakage current output by the switching tube, it outputs it to the second step-down module, and then powers the energy storage module after the voltage is stepped down by the second step-down module. The second recovery control chip also adjusts the output current according to the feedback signal of the second feedback module.

[0015] Optionally, the second step-down module includes a fourth inductor, a tenth diode and a fifth capacitor, one end of the fourth inductor and the cathode of the tenth diode are connected together as one end of the second step-down module, the other end of the fourth inductor and one end of the fifth capacitor are connected together as the other end of the second step-down module, and the other end of the fifth capacitor and the anode of the tenth diode are connected to the ground.

[0016] Optionally, the second feedback module includes a fifty-ninth resistor and a sixtieth resistor, one end of the fifty-ninth resistor is one end of the second feedback module, the second end of the fifty-ninth resistor and the first end of the sixtieth resistor are connected together as the other end of the second feedback module, and the second end of the sixtieth resistor is grounded.

[0017] Optionally, the inverter further includes a control module and a cooling module, wherein the control module controls the cooling module to cool the inverter unit and controls the first energy recovery module to operate;

[0018] The control module is further configured to control the second energy recovery module to be connected to the switch tube and start working when the switch tube on the bridge arm is turned off.

[0019] A second aspect of an embodiment of the present invention provides an inverter, which includes the energy recovery device and an inverter unit described in the first aspect.

[0020] The technical effect of the embodiment of the utility model is: the technical solution provides a new energy recovery method for the inverter, effectively utilizes the temperature difference generated during the operation of the inverter unit, and converts the temperature difference into electrical energy, reducing energy waste. By recycling and storing energy, the overall energy efficiency of the system is improved, and the operating cost is reduced. At the same time, waste heat emissions are reduced, and thermal pollution to the environment is reduced, which has significant environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. 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 labor.

[0022] Figure 1 This is a structural diagram of an energy recovery device for an inverter provided in Example 1 of the present utility model;

[0023] Figure 2 This is a structural diagram of a first energy recovery module in an energy recovery device for an inverter provided in Example 1 of the present utility model;

[0024] Figure 3 This is a circuit diagram of a first energy recovery module in an energy recovery device for an inverter provided in Example 1 of the present utility model;

[0025] Figure 4 This is another structural schematic diagram of an energy recovery device for an inverter provided in the first embodiment of the present utility model;

[0026] Figure 5 This is a structural diagram of a second energy recovery module in an energy recovery device for an inverter provided in Example 1 of the present utility model;

[0027] Figure 6 This is a circuit diagram of a second energy recovery module in an energy recovery device for an inverter provided in Example 1 of the present utility model;

[0028] Figure 7 This is a circuit diagram of an energy recovery device for an inverter provided in Example 1 of the present utility model;

[0029] In the figure: 10, first energy recovery module; 20, inverter unit; 30, energy storage module; 40, second energy recovery module; 101, thermoelectric power generation module; 102, energy recovery unit; 121, first recovery control chip; 122, recovery switch module; 123, first step-down module; 124, first feedback module; 401, second recovery control chip; 402, second step-down module; 403, second feedback module. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] It should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for clarity. Like reference numerals denote like elements throughout.

[0032] It should be understood that when an element or layer is referred to as being "on," "adjacent to," "connected to," or "coupled to" another element or layer, it may be directly on, adjacent to, connected to, or coupled to the other element or layer, or there may be intervening elements or layers. Conversely, when an element is referred to as being "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 merely 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 represented as a second element, component, region, layer, or part.

[0033] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," 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 the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the drawings is flipped, then the elements or features described as "under" or "beneath" or "beneath" the other elements will be oriented as "over" the other elements or features. Thus, the exemplary terms "under" and "under" may include both the upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or in other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0034] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present invention. When used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0035] In order to fully understand the present invention, the following description will provide detailed structures and steps 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 also have other implementation methods.

[0036] Example 1

[0037] A first embodiment of the present invention provides an energy recovery device for an inverter, which solves the problem in the prior art that the inverter generates a large amount of loss during operation, resulting in energy waste.

[0038] The first embodiment of the present invention provides an energy recovery device for an inverter, such as Figure 1 As shown, the inverter includes an inverter unit 20, and the energy recovery device includes: a first energy recovery module 10 and an energy storage module 30;

[0039] The first energy recovery module 10 includes a thermoelectric power generation module 101 and an energy recovery unit 102. The thermoelectric power generation module 101 is disposed adjacent to the inverter unit 20. The thermoelectric power generation module 101 is connected to the energy recovery unit 102. The energy recovery unit 102 is connected to the energy storage module 30.

[0040] The thermoelectric power generation module 101 is used to output a recovery current to the energy recovery unit 102 when a temperature difference is generated in the inverter unit 20 . The energy recovery unit 102 processes the recovery current and then charges the energy storage module 30 .

[0041] The inverter unit 20 converts direct current (DC) into alternating current (AC) to meet the needs of various electrical devices. This conversion is achieved through the frequent on-and-off switching of switching devices (such as MOSFETs). The first energy recovery module 10 generates electricity using the temperature difference generated during the operation of the inverter unit 20. When the inverter unit 20 operates, it generates heat, causing the temperature on one side of the thermoelectric power generation module 101 to rise. The thermoelectric power generation module 101 utilizes the Seebeck effect of thermoelectric materials to convert the temperature difference into electrical energy. Furthermore, when the inverter unit 20 overheats and needs to be cooled, the temperature difference is also received by the thermoelectric power generation module 101 and converted into electrical energy. The energy recovery unit 102 processes the recovered current output by the thermoelectric power generation module 101 to meet the charging needs of the energy storage module 30. It receives the current generated by the thermoelectric power generation module 101 and rectifies, stabilizes, and filters it to ensure stable and reliable output power. The energy storage module 30 stores the processed power from the energy recovery unit 102 for subsequent use. The energy storage device (such as a battery or a supercapacitor) is charged by the stable current output by the energy recovery unit 102 .

[0042] Among them, the working process of this embodiment is as follows: the inverter unit 20 converts direct current into alternating current, during which heat is generated and a temperature difference is formed. At the same time, when the temperature of the inverter unit 20 is too high, it will be cooled by the cooling module, which will also form a temperature difference, that is, the temperature of the inverter unit 20 changes greatly during operation. The thermoelectric power generation module 101 uses the temperature difference generated by the inverter unit 20 to generate electricity and output a recovered current. The energy recovery unit 102 receives and processes the recovered current of the thermoelectric power generation module 101, rectifies, stabilizes and filters the current, and outputs stable electrical energy. The electrical energy output by the energy recovery unit 102 is used to charge the energy storage module 30 and store energy for later use.

[0043] The technical effect of this embodiment is that: this technical solution provides a new energy recovery method for the inverter, effectively utilizes the temperature difference generated during the operation of the inverter unit, and converts the temperature difference into electrical energy, reducing energy waste. By recycling and storing energy, the overall energy efficiency of the system is improved, and operating costs are reduced. At the same time, waste heat emissions are reduced, and thermal pollution to the environment is reduced, which has significant environmental benefits.

[0044] Thermoelectric power generation module 101 utilizes the thermoelectric effect of materials to convert thermal energy into electrical energy. The thermoelectric material module is the core component of thermoelectric power generation module 101 and contains thermoelectric materials. When a temperature difference forms at the contact point between two different materials, a voltage difference is generated within the materials, which increases with the temperature difference. The free electrons and electron holes in the thermoelectric material, under the influence of the temperature difference, form an electric current, thereby converting thermal energy into electrical energy.

[0045] The energy recovery unit 102 may have a diverse structure to ensure effective processing of the recovered current output by the thermoelectric power generation module 101 and adapt it to the energy storage module 30. The energy recovery unit 102 includes but is not limited to the following structures:

[0046] 1. Rectifier: Converts the AC power output by the thermoelectric power generation module 101 into DC power (the thermoelectric power generation module 101 can output AC power or DC power). A diode bridge rectifier or a synchronous rectifier can be used to improve rectification efficiency and reduce losses.

[0047] 2. DC-DC Converter: This converts the DC power output by the thermoelectric power generation module 101 into an appropriate voltage and current to match the charging requirements of the energy storage module 30. The thermoelectric power generation module 101 can be a Buck converter, which is used to step down a higher voltage and convert it to a lower voltage; a Boost converter, which is used to step up a lower voltage and convert it to a higher voltage; or a Buck-Boost converter, which can switch between step-down and step-up to accommodate a wider input voltage range.

[0048] 3. Voltage Regulator: Ensures stable output voltage to prevent voltage fluctuations from affecting the charging process of the energy storage module 30. Either a linear regulator or a switching regulator can be used, depending on efficiency and heat dissipation requirements.

[0049] 4. Charging management unit: manages the charging process of the energy storage module 30, prevents overcharging or over-discharging, and extends the life of the energy storage module 30. The structure includes a charging control circuit, a temperature monitoring circuit, and a protection circuit.

[0050] 5. Energy Management System (EMS): The structure can include a microcontroller or digital signal processor (DSP), combined with sensors and communication modules to achieve intelligent management.

[0051] As an embodiment, this embodiment is only an example of the energy recovery unit 102 and does not limit the structure of the energy recovery unit 102. Figure 2 As shown, the energy recovery unit 102 includes a first recovery control chip 121, a recovery switch module 122, a first voltage reduction module 123 and a first feedback module 124. One end of the recovery switch module 122 is connected to the thermoelectric power generation module 101, and the other end of the recovery switch module 122 is connected to one end of the first voltage reduction module 123. The other end of the first voltage reduction module 123 is respectively connected to one end of the first feedback module 124 and one end of the energy storage module 30. The first recovery control chip 121 is respectively connected to the control end of the recovery switch module 122 and the other end of the first feedback module 124. When the first recovery control chip 121 detects the recovery current, it controls the recovery switch module 122 to be turned on and supplies power to the energy storage module 30 after voltage reduction through the first voltage reduction module 123. The first recovery control chip 121 also controls the conduction and shutdown of the recovery switch module 122 according to the feedback signal of the first feedback module 124.

[0052] The first recycling control chip 121 is used to monitor the recycled current, control the on and off state of the recycling switch module 122, and adjust the operating state of the recycling switch module 122 based on feedback signals. When the recycled current output by the thermoelectric power generation module 101 is detected, the first recycling control chip 121 controls the recycling switch module 122 to conduct, and adjusts the on-time and frequency of the recycling switch module 122 based on the feedback signal to achieve a stable output of the recycled current to the energy storage module 30. The recycling switch module 122 controls the on and off state of the current, connecting the thermoelectric power generation module 101 and the step-down module. Under the control of the first recycling control chip 121, the recycling switch module 122 conducts, allowing the current generated by the thermoelectric power generation module 101 to flow to the first step-down module 123. When energy recovery is not required, the recycling switch module 122 is turned off, severing the current path. The first step-down module 123 reduces the voltage of the recovered current to a voltage level suitable for the energy storage module 30. It receives current from the recovery switch module 122 and, through a step-down circuit (such as a Buck converter), reduces the high voltage to the low voltage required by the energy storage module 30. The first feedback module 124 collects the voltage and current output by the first step-down module 123 and provides feedback signals to the first recovery control chip 121. By monitoring the reduced voltage and current in real time, it feeds this information back to the first recovery control chip 121, helping it adjust the operating state of the recovery switch module 122.

[0053] The operating process of this embodiment is as follows: the thermoelectric power generation module 101 generates current, which is detected by the first recovery control chip 121. The first recovery control chip 121 then switches on the recovery switch module 122, directing the current to the first step-down module 123. The recovered current passes through the first step-down module 123, reducing its voltage to a level suitable for the energy storage module 30. The reduced voltage current then flows to the energy storage module 30, charging it. The first feedback module 124 monitors the reduced voltage and current in real time and transmits a feedback signal to the first recovery control chip 121. Based on the feedback signal, the first recovery control chip 121 adjusts the on / off state of the recovery switch module 122 to optimize the energy recovery process.

[0054] The technical effect of this embodiment is that: the first recovery control chip controls the conduction and disconnection of the recovery switch module, effectively sending the current generated by the thermoelectric power generation module to the first step-down module; the first step-down module converts the high-voltage current into a stable low-voltage output through a step-down converter or transformer, which is suitable for charging the energy storage module. The first recovery control chip adjusts the operating state of the recovery switch module by monitoring the real-time voltage and current information of the first feedback module to ensure stable current flow and voltage output.

[0055] For the step-down module, the structure of the step-down module can be diversified, including but not limited to the following structures:

[0056] 1. A basic buck module: a switch (such as a MOSFET), a diode, an inductor, and an output capacitor. When the switch is on, current flows through the inductor to store energy, gradually increasing the inductor current, while the output capacitor supplies power to the load. When the switch is off, the inductor releases energy, supplying power to the load through the diode, while the output capacitor provides current smoothing.

[0057] 2. Synchronous buck module: Two switches (such as MOSFETs), an inductor, and an output capacitor. When the main switch is on, current flows through the inductor to store energy, increasing the inductor current and supplying power to the load via the output capacitor. When the main switch is off and the synchronous switch is on, the inductor releases energy through the synchronous switch, supplying power to the load.

[0058] 3. Multi-phase buck module: Multiple phases of basic buck modules are connected in parallel, with each phase having its own switch, inductor, and diode (or synchronous switch). The phases work alternately to smooth the output current and reduce output ripple.

[0059] 4. Buck-Boost module: This module consists of a switch (such as a MOSFET), a diode, an inductor, and two capacitors. It can both step down and step up voltages, controlling the on and off times of the switch to allow the input voltage to be higher or lower than the output voltage.

[0060] As an implementation mode, this implementation mode is only an example and does not limit the structure of the step-down module. Figure 3 As shown, the first step-down module 123 includes a first inductor L1, a third diode D3 and a second capacitor C2. One end of the first inductor L1 and the cathode of the third diode D3 are commonly connected to form one end of the first step-down module 123. The other end of the first inductor L1 and one end of the second capacitor C2 are commonly connected to form the other end of the first step-down module 123. The anode of the third diode D3 and the other end of the second capacitor C2 are commonly connected to the ground.

[0061] Among them, the recovery switch module 122 is a MOS transistor Q1. When the MOS transistor Q1 is turned on, the current generated by the thermoelectric power generation module 101 passes through the first inductor L1, and the first inductor L1 begins to store energy. Current path: thermoelectric power generation module 101 → MOS transistor Q1 → second diode D2 → first inductor L1 → resistor R1 → energy storage module 30 (not shown). The second capacitor C2 will also start to charge through the same path and store charge. When the MOS transistor Q1 is turned off, the energy stored in the first inductor L1 needs to be released. Because the inductor resists sudden changes in current, the inductor current will not stop immediately, but will continue to flow. At this time, the voltage polarity across the first inductor L1 will reverse, causing the third diode D3 to be forward biased and start to conduct. Current path: first inductor L1 → second capacitor C2 → anode of the third diode D3 → cathode of the third diode D3.

[0062] The technical benefits of this embodiment are as follows: the first inductor smoothes the current when the recovery switch module is turned on and off, preventing sudden current changes and protecting the energy storage module. The second capacitor provides charge buffering and smoothes the output voltage when the inductor releases energy, reducing voltage fluctuations. Through the coordinated operation of the first inductor, the third diode, and the second capacitor, this technical solution achieves efficient energy recovery and stable output, improving the energy efficiency and reliability of the overall system.

[0063] As an implementation method, Figure 3 As shown, the second feedback module 403 includes a second resistor R2 and a fifth resistor R5, one end of the second resistor R2 is one end of the second feedback module 403, the second end of the second resistor R2 and the first end of the fifth resistor R5 are connected together as the other end of the second feedback module 403, and the second end of the fifth resistor R5 is grounded.

[0064] The first recycling control chip 121 is chip U1, and the second feedback module 403 includes a second resistor R2 and a fifth resistor R5, which are used to provide a feedback signal. The specific operating process is as follows: the second resistor R2 and the fifth resistor R5 are connected to form a voltage divider circuit, which is connected to the output terminal of the first step-down module 123. The feedback signal is transmitted to chip U1 to help it determine the actual level of the output voltage. Based on the feedback signal, chip U1 adjusts the on and off states of MOS transistor Q1. If the feedback signal indicates that the output voltage is too high, chip U1 will reduce the on time of MOS transistor Q1, reducing the output voltage. If the feedback signal indicates that the output voltage is too low, chip U1 will increase the on time of MOS transistor Q1, increasing the output voltage.

[0065] The technical effect of this embodiment is that: through the feedback signal generated by the resistance voltage divider circuit, the first recovery control chip can accurately control the on and off time of the recovery switch module to ensure the stability of the output voltage.

[0066] This embodiment also includes another energy recovery method. When the switch tube (such as MOSFET or BJT) is turned off, ideally no current flows out. However, in actual applications, there may be some situations that cause current to flow out, such as:

[0067] 1. Leakage Current: Even when the switch is completely turned off, there will be a very small leakage current passing through.

[0068] 2. Parasitic capacitance discharge: The parasitic capacitance of the switching tube may discharge when it is turned off, causing instantaneous current flow.

[0069] 3. Circuit noise and interference: External noise or interference may cause instantaneous current flow.

[0070] In general, in an actual circuit, current may flow due to the above reasons.

[0071] To solve the above problems, in this embodiment, Figure 4 As shown, the energy recovery device further includes a second energy recovery module 40 , and the second energy recovery module 40 is connected to the energy storage module 30 ;

[0072] The second energy recovery module 40 is connected in series with at least one switch tube in the inverter unit 20 . The second energy recovery module 40 receives the leakage current output when the switch tube is turned off, processes the leakage current, and then charges the energy storage module 30 .

[0073] In this technical solution, the energy recovery device includes not only a first energy recovery module 10, but also a second energy recovery module 40. The second energy recovery module 40 is connected to the energy storage module 30 and is connected in series with at least one switch in the inverter unit 20. In the inverter unit 20, when a switch (such as a MOSFET or IGBT) is turned off, the device may generate leakage current. The second energy recovery module 40 is connected in series with the switch circuit in the inverter unit 20 and can receive this leakage current.

[0074] The technical effect of this embodiment is that the leakage current generated when the switch is turned off is recycled, reducing energy waste and improving overall energy utilization efficiency. The processed leakage current is transmitted to the energy storage module 30 to charge it, thus achieving energy reuse.

[0075] As an implementation method, Figure 5 As shown, the second energy recovery module 40 includes a second recovery control chip 401, a second step-down module 402 and a second feedback module 403. One end of the second recovery control chip 401 is connected to one end of the switch tube in the inverter, and the other end of the second recovery control chip 401 is connected to one end of the second step-down module 402. The other end of the second step-down module 402 is respectively connected to one end of the second feedback module 403 and one end of the energy storage module 30. The second recovery control chip 401 is respectively connected to the other end of the second feedback module 403;

[0076] When the second recovery control chip 401 receives the leakage current output by the switch tube 201, it outputs it to the second step-down module 402, and then powers the energy storage module 30 after the voltage is stepped down by the second step-down module 402. The second recovery control chip 401 also adjusts the output current according to the feedback signal of the second feedback module 403.

[0077] The second recovery control chip 401 connects to the switch 201 in the inverter, receives the leakage current output by the switch 201, and directs the current to the second step-down module 402 based on the received current information. By adjusting its control logic, it ensures that the current maintains a stable outflow when transferred to the second step-down module 402. The second step-down module 402 is connected to one end of the second recovery control chip 401, receives the current transmitted from the switch in the inverter, and steps down the high-voltage current to a voltage level suitable for reception and storage by the energy storage module 30. The second feedback module 403 continuously monitors the current and voltage output by the second step-down module 402 and transmits the monitored data to the second recovery control chip 401. The feedback signal includes the changes in current and voltage, which is used by the second recovery control chip 401 to adjust the current output. The second recovery control chip 401 adjusts the current by adjusting the frequency and duty cycle of the internal switch to achieve stable current output.

[0078] The technical effect of this embodiment is that the second recovery control chip controls the direction and transfer of current by receiving the current output of the switching tube in the inverter, effectively steps down the high-voltage current to a voltage suitable for reception and storage by the energy storage module through the second step-down module, continuously monitors the current and voltage status output by the second step-down module through the second feedback module, and ensures that the current maintains a stable outflow when transmitted to the second step-down module by adjusting the frequency and duty cycle of the internal switching tube, thereby optimizing the energy transfer process.

[0079] As an implementation method, Figure 6 As shown, the second step-down module 402 includes a fourth inductor L4, a tenth diode D10, and a fifth capacitor C5. One end of the fourth inductor L4 and the cathode of the tenth diode D10 are connected together to form one end of the second step-down module 402. The other end of the fourth inductor L4 and one end of the fifth capacitor C5 are connected together to form the other end of the second step-down module 402. The other end of the fifth capacitor C5 and the anode of the tenth diode D10 are connected together to ground.

[0080] When the switch tube 201 generates leakage current, the second recovery control chip 401 receives and outputs the current, and the fourth inductor L4 begins to store energy. The current path is: switch tube 201 → sixty-fourth resistor R64 → chip U11 → fourth inductor L4 → energy storage module 30. The fifth capacitor C5 also begins to charge through the same path, storing charge. When the second recovery control chip 401 stops outputting, the stored energy in the fourth inductor L4 needs to be released. Because the inductor resists sudden changes in current, the inductor current does not stop immediately but continues to flow. At this time, the voltage polarity across the fourth inductor L4 reverses, causing the tenth diode D10 to become forward biased and begin to conduct. The current path is: fourth inductor L4 → fifth capacitor C5 → anode of the tenth diode D10 → cathode of the tenth diode D10.

[0081] The technical effect of this embodiment is that the fourth inductor smoothes the current when the second recovery control chip outputs current and stops outputting current, avoiding current mutations and protecting the energy storage module; the fifth capacitor provides charge buffering and smoothes the output voltage when the inductor releases energy, reducing voltage fluctuations; this technical solution achieves efficient energy recovery and stable output through the coordinated work of the fourth inductor, the tenth diode and the fifth capacitor, thereby improving the energy efficiency and reliability of the overall system.

[0082] As an implementation method, Figure 6 As shown, the second feedback module 403 includes a fifty-ninth resistor R59 and a sixtieth resistor R60, one end of the fifty-ninth resistor R59 is one end of the second feedback module 403, the second end of the fifty-ninth resistor R59 and the first end of the sixtieth resistor R60 are connected together as the other end of the second feedback module 403, and the second end of the sixtieth resistor R60 is grounded.

[0083] The second recycling control chip 401 is chip U11, and the second feedback module 403 includes a 59th resistor R59 and a 60th resistor R60, which are used to provide feedback signals. The specific operating process is as follows: The 59th resistor R59 and the 60th resistor R60 are connected to form a voltage divider circuit, which is connected to the output terminal of the second step-down module 402. The feedback signal is transmitted to chip U11 to help it determine the actual level of the output voltage. Based on the feedback signal, chip U11 adjusts the on and off states of its internal switch module. If the feedback signal indicates that the output voltage is too high, chip U11 will reduce the on time of the internal switch module, reducing the output voltage. If the feedback signal indicates that the output voltage is too low, chip U11 will increase the on time of the internal switch module, increasing the output voltage.

[0084] The technical effect of this embodiment is that: through the feedback signal generated by the resistor voltage divider circuit, the second recovery control chip can accurately control the on and off time of the internal switch module to ensure the stability of the output voltage.

[0085] As an embodiment, the inverter also includes a control module and a cooling module. When the control module controls the cooling module to cool the inverter unit 20, it controls the first energy recovery module 10 to work; the control module is also used to control the switch tube on the bridge arm to be turned off, and control the second energy recovery module 40 to be turned on with the switch tube and start working.

[0086] Among them, the control module decides when to adjust the operating state of the cooling module based on the load data and temperature distribution information. Based on this data, the control module will generate corresponding instructions and send them to the cooling module to make it operate according to the predetermined strategy, such as increasing the air volume or flow rate when the load is large, and reducing the air volume or flow rate when the load is small. The cooling module includes an air cooling component and a liquid cooling component; the control module adjusts the air speed of the air cooling component or the liquid flow rate of the liquid cooling component according to the load data and temperature distribution information to adjust the temperature inside the inverter. When the control module detects that the temperature of the inverter unit 20 exceeds the preset temperature value, it controls the cooling module to cool down; the thermoelectric power generation module 101 is arranged adjacent to the switch tube, and the thermoelectric power generation module 101 is used to output a recovery current to the recovery control module when a temperature difference is generated in the switch tube. The recovery control module processes the recovery current and charges the energy storage module 30.

[0087] As an embodiment, based on the above-mentioned first energy recovery module and second energy recovery module, the control module is connected to the first energy recovery module and the second energy recovery module respectively. When the control module detects that the temperature of the switching tube exceeds the preset temperature value, the cooling module is controlled to adjust the temperature inside the inverter, and the first energy recovery module is controlled to start working to recover the energy converted from the temperature difference generated when the temperature of the switching tube changes from high to low; when the control module detects that the switching tube is turned off, the second energy recovery module is controlled to be connected to the switching tube and start working to recover the current output by the residual energy stored when the switching tube is turned off.

[0088] The control module regularly monitors the temperature of the switching tubes in the inverter. When it detects that the temperature of the switching tubes exceeds a preset safety temperature, the control module sends a signal to the cooling module to adjust the temperature inside the inverter. When the control module detects that the temperature of the switching tubes is high, it activates the first energy recovery module. The first energy recovery module, connected to the thermoelectric power generation module 101 of the switching tubes in the inverter, uses the thermoelectric effect to convert the temperature difference generated when the temperature of the switching tubes changes from high to low to electrical energy. The recovered electrical energy is then stepped down by the first step-down module 123 and supplied to the energy storage module 30, achieving effective energy recovery and storage. When the control module detects that the switching tubes are turned off, it activates the second energy recovery module, which is responsible for processing and recovering the residual energy stored when the switching tubes are turned off. The second recovery control chip is connected to one end of the switching tubes in the inverter and receives the current output when the switching tubes are turned off. After stepping down by the second step-down module 402, the residual energy is converted into a current output, which is then supplied to the energy storage module 30 or directly re-injected into the input of the inverter for auxiliary power supply.

[0089] The technical effect of this embodiment is that: through the first energy recovery module and the second energy recovery module, the heat energy generated by the switch tube during operation and shutdown is effectively captured and utilized, converted into electrical energy and stored or reused, thereby reducing energy waste and improving the overall energy efficiency of the system; the control unit monitors the working status of the switch tube, intelligently adjusts the working timing and current output of the first energy recovery module and the second energy recovery module, and realizes precise management and control of the energy recovery process.

[0090] The following is a detailed description of the present invention through a specific circuit structure:

[0091] like Figure 7 As shown, the recovery unit 104 includes a chip U1 and a chip U11, and the chip U1 and the chip U11 are electrically connected through the battery pack B1B2B3. One end of the battery pack B1B2B3 is electrically connected to the chip U1, and the other end of the battery pack B1B2B3 is electrically connected to one end of the tenth resistor R10. The other end of the tenth resistor R10 is respectively electrically connected to the keyboard key J3, one end of the thirteenth resistor R13 and one end of the fifteenth resistor R15. The other end of the fifteenth resistor R15 is respectively electrically connected to one end of the fourth inductor L4, one end of the fifty-ninth resistor R59, one end of the forty-ninth capacitor C49, one end of the fifth capacitor C5 and one end of the forty-fifth capacitor C45.

[0092] The IN port of chip U11 is electrically connected to one end of the sixty-first resistor R61, one end of the forty-eighth capacitor C48 and one end of the sixty-fourth resistor R64, respectively. The other end of the sixty-fourth resistor R64 is connected to the recovery current. The EN port of chip U11 is electrically connected to the other end of the sixty-first resistor R61 and one end of the sixty-second resistor R62, respectively. The BS port of chip U11 is electrically connected to the other end of the fourth inductor L4, the cathode of the tenth diode D10 and the SW port of chip U11 through the forty-seventh capacitor C47, respectively. The FB port of chip U11 is electrically connected to the other end of the fifty-ninth resistor R59, one end of the sixtieth resistor R60 and the other end of the forty-ninth capacitor C49, respectively. At the same time, the other end of the forty-eighth capacitor C48, the other end of the fifth capacitor C5, the other end of the forty-fifth capacitor C45, the other end of the sixtieth resistor R60, the other end of the sixty-second resistor R62, the anode of the tenth diode D10 and the GND port of chip U11 are all grounded.

[0093] Specifically, the VG port of the chip U1 is electrically connected to one end of the third capacitor C3, and the other end of the third capacitor C3 is electrically connected to the source of the MOS tube Q1 and one end V1 of the temperature-pressure power generation module 101, respectively. The VCC port of the chip U1 is respectively connected to one end of the sixty-third resistor R63, one end of the sixth resistor R6 and one end of the seventh resistor R7, and the other end of the sixth resistor R6 is electrically connected to the CHARG port of the chip U1 through the light-emitting diode D4. The other end of the seventh resistor R7 is respectively electrically connected to one end of the eleventh resistor R11 and the MPPT port of the chip U1. The drain of the MOS transistor Q1 is electrically connected to the anode of the second diode D2. The gate of the MOS transistor Q1 is electrically connected to one end of the third resistor R3 and one end of the fourth resistor R4. The other end of the third resistor R3 is electrically connected to the DRV port of the chip U1. The cathode of the second diode D2 is electrically connected to the cathode of the third diode D3 and one end of the first inductor L1. The other end of the first inductor L1 is electrically connected to the CSP port of the chip U1, one end of the first resistor R1, and one end of the second capacitor C2. The other end of the first resistor R1 is electrically connected to the BAT port of the chip U1, one end of the second resistor R2, and the positive electrode of the battery pack B1, B2, and B3. The other end of the second resistor R2 is electrically connected to one end of the fifth resistor R5 and the FB port of the chip U1. The COM port of the chip U1 is electrically connected to one end of the seventy-ninth resistor R79. The other end of the seventy-ninth resistor R79 is electrically connected to one end of the fourth capacitor C4. The other end of the fourth capacitor C4, the other end of the eleventh resistor R11, the anode of the third diode D3, the other end of the second capacitor C2, the other end of the fourth resistor R4, the other end of the fifth resistor R5 and the GND port of the chip U1 are all grounded.

[0094] Specifically, the fifth resistor R5 and the ninth resistor R9 are used to set the charging current and voltage limit, the fourth capacitor C4 and the forty-seventh capacitor C47 are used to stabilize the circuit and filter, the first inductor L1 is used to filter out ripple current, and the second diode D2, the third diode D3 and the tenth diode D10 are used to prevent reverse current from flowing.

[0095] The source of MOS transistor Q1 is connected to the thermoelectric power generation module 101 and receives the first recovery current. The IN terminal of chip U11 is connected to the switching transistor and receives the second recovery current. When the control unit 102 detects that the switching transistor is overheated and begins to cool the switching transistor, the control chip U1 begins to operate. Chip U1 controls MOS transistor Q1 to conduct, and the first recovery current is input to the recovery unit's V1 port. This current flows through MOS transistor Q1, second diode D2, first inductor L1, and first resistor R1 to charge batteries B1, B2, and B3. Pin 1 of chip U1 is the output of the internal voltage modulator, providing power for the internal drive circuit. A 100nF capacitor is connected between the VG and VCC pins. Chip U1 converts the input voltage to the required output voltage and uses the feedback pin FB to regulate the output voltage to maintain a constant level. The output voltage is divided by the second resistor R2 and the fifth resistor R5 and then connected to the feedback pin FB, forming a closed-loop control circuit. This allows chip U1 to adjust its switching frequency and duty cycle according to load demand, thereby maintaining a stable output voltage. MOS transistor Q1, first inductor L1, third diode D3, and second capacitor C2 form the buck circuit. First diode D1 prevents battery current backflow. Light-emitting diode D4 illuminates through sixth resistor R6, indicating normal circuit operation. Keyboard button J3 is used for manual control of circuit operation or settings. Other components, such as second capacitor C2 and third capacitor C3, provide additional filtering and stability.

[0096] When the control unit 102 detects that the switch is off, the control chip U11 begins operation. Chip U11 steps down the input current from port V2 to charge batteries B1, B2, and B3. The sixty-first and sixty-second resistors R61 and R62 divide the input current from port V2 to form a high voltage, setting the enable pin (pin 4) of chip U11 high to activate the circuit. The fourth inductor L4, the tenth diode D10, and the internal switch (pin 6) of chip U11 form the buck circuit. The output voltage is divided by the fifty-ninth and sixty-second resistors R59 and R60 and connected to the feedback pin FB, forming a closed-loop control circuit. This allows chip U11 to adjust the frequency and duty cycle of its internal switches according to load demand, thereby maintaining a stable output voltage.

[0097] Example 2

[0098] The second embodiment provides an inverter, which includes the energy recovery device and the inverter unit provided in the first embodiment.

[0099] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. An energy recovery device for an inverter, wherein the inverter comprises an inverter unit, characterized in that: The energy recovery device includes: a first energy recovery module and an energy storage module; The first energy recovery module includes a thermoelectric power generation module and an energy recovery unit, the thermoelectric power generation module is arranged adjacent to the inverter unit, the thermoelectric power generation module is connected to the energy recovery unit, and the energy recovery unit is connected to the energy storage module; The thermoelectric power generation module is used to output a recovery current to the energy recovery unit when a temperature difference is generated in the inverter unit. The energy recovery unit charges the energy storage module after processing the recovery current.

2. The energy recovery device according to claim 1, characterized in that The energy recovery unit includes a first recovery control chip, a recovery switch module, a first step-down module, and a first feedback module. One end of the recovery switch module is connected to the thermoelectric power generation module, the other end of the recovery switch module is connected to one end of the first step-down module, the other end of the first step-down module is respectively connected to one end of the first feedback module and one end of the energy storage module, and the first recovery control chip is respectively connected to the control end of the recovery switch module and the other end of the first feedback module; When the first recovery control chip detects the recovery current, it controls the recovery switch module to be turned on, and supplies power to the energy storage module after reducing the voltage through the first step-down module. The first recovery control chip also controls the conduction and shutdown of the recovery switch module according to the feedback signal of the first feedback module.

3. The energy recovery device according to claim 2, characterized in that: The first step-down module includes a first inductor, a third diode and a second capacitor. One end of the first inductor and the cathode of the third diode are connected together to form one end of the first step-down module. The other end of the first inductor and one end of the second capacitor are connected together to form the other end of the first step-down module. The anode of the third diode and the other end of the second capacitor are connected to a common ground.

4. The energy recovery device according to claim 2, characterized in that: The first feedback module includes a second resistor and a fifth resistor, one end of the second resistor is one end of the first feedback module, the second end of the second resistor and the first end of the fifth resistor are commonly connected to form the other end of the first feedback module, and the second end of the fifth resistor is grounded.

5. The energy recovery device according to claim 1, wherein: The energy recovery device further includes a second energy recovery module, wherein the second energy recovery module is connected to the energy storage module; The second energy recovery module is connected in series with at least one switch tube in the inverter unit. The second energy recovery module receives the leakage current output when the switch tube is turned off, processes the leakage current, and then charges the energy storage module.

6. The energy recovery device according to claim 5, characterized in that: The second energy recovery module includes a second recovery control chip, a second step-down module, and a second feedback module. One end of the second recovery control chip is connected to one end of the switch tube in the inverter, and the other end of the second recovery control chip is connected to one end of the second step-down module. The other end of the second step-down module is respectively connected to one end of the second feedback module and one end of the energy storage module. The second recovery control chip is respectively connected to the other end of the second feedback module. When the second recovery control chip receives the leakage current output by the switching tube, it outputs it to the second step-down module, and then powers the energy storage module after the voltage is stepped down by the second step-down module. The second recovery control chip also adjusts the output current according to the feedback signal of the second feedback module.

7. The energy recovery device according to claim 6, characterized in that: The second step-down module includes a fourth inductor, a tenth diode, and a fifth capacitor. One end of the fourth inductor and the cathode of the tenth diode are connected together to form one end of the second step-down module. The other end of the fourth inductor and one end of the fifth capacitor are connected together to form the other end of the second step-down module. The other end of the fifth capacitor and the anode of the tenth diode are connected together to ground.

8. The energy recovery device according to claim 6, characterized in that: The second feedback module includes a fifty-ninth resistor and a sixtieth resistor, one end of the fifty-ninth resistor is one end of the second feedback module, the second end of the fifty-ninth resistor and the first end of the sixtieth resistor are connected together as the other end of the second feedback module, and the second end of the sixtieth resistor is grounded.

9. The energy recovery device according to claim 5, characterized in that: The inverter further includes a control module and a cooling module, wherein the control module controls the cooling module to cool the inverter unit and controls the first energy recovery module to operate; The control module is further configured to control the second energy recovery module to be connected to the switch tube and start working when the switch tube on the bridge arm is turned off.

10. An inverter, characterized in that: The inverter includes the energy recovery device according to any one of claims 1 to 9 and an inverter unit.

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