Inverter module power supply device and control method thereof

Abstract

This invention discloses an inverter module power supply device and its control method. The inverter module power supply device includes a first inverter module, a transformer, an AC-DC conversion module, a first detection module, a switching module, a third inverter module, a first switch module, a first power supply module, a second power supply module, a second detection module, a second switch module, and a control module. The third inverter module includes a first bridge arm and a second bridge arm. The control module is used to control the first switch module, the second switch module, the switching module, the first inverter module, the AC-DC conversion module, and the third inverter module, to detect the working status of the first inverter module, the AC-DC conversion module, the third inverter module, and the switching module based on the detection results of the first detection module and the second detection module. This technical solution can accurately identify modules where abnormalities occur, reduce the investment of testing equipment and manpower, shorten the maintenance cycle through rapid fault location, and reduce economic losses caused by downtime.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of inverter module, and particularly relates to an inverter module power supply device and a control method thereof. BACKGROUND

[0002] With the rapid development of photovoltaic and energy storage industries, as the core device of system energy conversion and scheduling, the reliability of the inverter is directly related to the whole life cycle benefit of the power station and the energy storage system. In the production and operation and maintenance process of the existing inverter, the state of the hardware circuit is usually judged by relying on manual detection and partial software diagnosis means. However, this method has the following disadvantages: on the one hand, the manual detection procedure is tedious, and the fault positioning efficiency is low, resulting in high production and maintenance costs; on the other hand, the software diagnosis means usually outputs alarm information only after the circuit abnormality occurs, and it is difficult to judge the fault point of the specific device or circuit module in time and accurately, which may cause the risk of fault expansion or even equipment explosion. Especially in the background of large-scale popularization and application of energy storage inverters, the lack of efficient and automated hardware detection means has become an important bottleneck restricting the intelligent operation and maintenance and reliability improvement of the industry. SUMMARY

[0003] Embodiments of the present application provide an inverter module power supply device and a control method thereof to solve the above technical problems.

[0004] The first aspect of the embodiments of the present application provides an inverter module power supply device, which comprises a first inverter module, a transformer, an AC-DC conversion module, a first detection module, a switching module, a third inverter module, a first switch module, a first power module, a second power module, a second detection module, a second switch module and a control module, wherein the third inverter module comprises a first bridge arm and a second bridge arm.

[0005] The first inverter module, the transformer, the AC-DC conversion module, the first detection module and the switching module are connected in sequence, the switching module is connected to the common end of the first switch module, the two ends of the first bridge arm and the two ends of the second bridge arm respectively, the middle end of the first bridge arm is connected to one end of the second detection module, the other end of the second detection module is connected to one end of the second switch module, the other end of the second switch module is connected to the middle end of the second bridge arm, the first switching end of the first switch module is connected to the first power module, the second switching end of the first switch module is connected to the second power module, and the control module is connected to the first inverter module, the AC-DC conversion module, the first detection module, the switching module, the third inverter module, the first switch module, the second switch module and the second detection module respectively.

[0006] The control module is used to control the first switch module, the second switch module, the switching module, the first inverter module, the AC-DC conversion module, and the third inverter module, so as to detect the working status of the first inverter module, the AC-DC conversion module, the third inverter module, and the switching module respectively according to the detection results of the first detection module and the second detection module.

[0007] Optionally, the control module is used to control the first switch module to switch to the first power module, control the second switch module to turn on, control the third inverter module to start working, and detect the working status of the third inverter module according to the detection result of the second detection module.

[0008] Optionally, the first bridge arm includes a first switch and a third switch, and the second bridge arm includes a second switch and a fourth switch. One end of the first switch and one end of the second switch are connected together to form a first common terminal. The other end of the first switch and one end of the third switch are connected together to form the middle end of the first bridge arm. The other end of the second switch and one end of the fourth switch are connected together to form the middle end of the second bridge arm. The other end of the third switch and the other end of the fourth switch are connected together to form a second common terminal.

[0009] Optionally, when the control module controls the first switch and the fourth switch to be turned on, and controls the second switch and the third switch to be turned off, it obtains a first current value based on the second detection module. When the first current value is a first preset current value, it determines that the first switch and the fourth switch are normal; when the first current value is not the first preset current value, it determines that the first switch and the fourth switch are abnormal.

[0010] When the control module controls the first and fourth switching transistors to turn off and the second and third switching transistors to turn on, it obtains a second current value based on the second detection module. If the second current value is a second preset current value, the second and third switching transistors are determined to be normal; if the second current value is not the second preset current value, the second and third switching transistors are determined to be abnormal.

[0011] Optionally, the control module is further configured to control the first switch module to switch its connection to the first power module, control the AC-DC conversion module and the switching module to start working, and detect the working status of the AC-DC conversion module and the switching module based on the detection result of the first detection module.

[0012] Optionally, the switching module includes a fifth switch and a sixth switch, and the AC-DC conversion module includes a seventh switch, an eighth switch, a ninth switch, and a tenth switch. One end of the seventh switch is connected to one end of the eighth switch and one end of the first detection module. The other end of the first detection module is connected to one end of the fifth switch and one end of the sixth switch. The other end of the fifth switch is one end of the AC-DC conversion module. The other end of the seventh switch and one end of the ninth switch are connected to one end of the transformer. The other end of the eighth switch and one end of the tenth switch are connected to the other end of the transformer. The other end of the ninth switch is connected to the other end of the tenth switch and the other end of the sixth switch, thus forming the other end of the AC-DC conversion module.

[0013] The control module is also used to control the fifth, seventh, and tenth switching transistors to be turned on, and the sixth, eighth, and ninth switching transistors to be turned off. Based on the third current value obtained by the first detection module, when the third current value is a third preset current value, the fifth, seventh, and tenth switching transistors are determined to be normal; when the third current value is not the third preset current value, the fifth, seventh, and tenth switching transistors are determined to be abnormal.

[0014] The control module is also used to control the fifth, seventh, and tenth switching transistors to turn off, and when the sixth, eighth, and ninth switching transistors are turned on, to obtain a fourth current value based on the first detection module. When the fourth current value is a fourth preset current value, the sixth, eighth, and ninth switching transistors are determined to be normal; when the fourth current value is not the fourth preset current value, the sixth, eighth, and ninth switching transistors are determined to be abnormal.

[0015] Optionally, the control module is used to control the first switching module to switch to the second power module, control the fifth switching transistor to turn on, and detect the first voltage value on the switching module. When the first voltage value is the voltage value output by the second power module, the fifth switching transistor is determined to be normal; when the first voltage value is not the voltage value output by the second power module, the fifth switching transistor is determined to be abnormal.

[0016] A second aspect of this invention provides a control method for an inverter module power supply device based on the one described in Embodiment 1, the control method comprising:

[0017] The system controls the first switch module, the second switch module, the switching module, the first inverter module, the AC-DC conversion module, and the third inverter module to detect the operating status of the first inverter module, the AC-DC conversion module, the third inverter module, and the switching module based on the detection results of the first detection module and the second detection module.

[0018] The technical advantages of this invention are as follows: The first and second detection modules monitor the operating status of the first inverter module, AC-DC conversion module, third inverter module, and switching module in real time, avoiding the inefficient traditional method of relying on manual detection. The control module automatically judges and controls each switch and inverter module based on the detection results, significantly improving detection efficiency and accuracy. Through multi-channel detection and controllable switching loops, abnormal modules or branches can be accurately identified. In production, testing, or operation, once a fault occurs, it can be located immediately, reducing troubleshooting time. Automated detection replaces traditional manual testing, reducing the investment in testing equipment and manpower. In the maintenance process, rapid fault location shortens the repair cycle and reduces economic losses caused by downtime. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an inverter module power supply device provided in Embodiment 1 of the present invention;

[0021] Figure 2 This is a partial circuit diagram of an inverter module power supply device provided in Embodiment 1 of the present invention;

[0022] Figure 3 This is another part of the circuit diagram of an inverter module power supply device provided in Embodiment 1 of the present invention;

[0023] In the diagram: 101, First inverter module; 102, Transformer; 103, AC-DC conversion module; 104, First detection module; 105, Switching module; 106, First switch module; 107, First power supply module; 108, Second power supply module; 109, Second detection module; 110, Second switch module; 111, First bridge arm; 112, Second bridge arm. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] It should be understood that the invention can be embodied in various forms and should not be construed as being limited to the embodiments set forth herein. Rather, providing these embodiments will make the disclosure thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, for clarity, the dimensions and relative dimensions of layers and regions may be exaggerated. The same reference numerals denote the same elements throughout.

[0026] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, 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, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this invention, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0027] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the 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, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0028] To fully understand this invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0029] Example 1

[0030] This embodiment provides an inverter module power supply device, such as... Figure 1 As shown, it includes: a first inverter module 101, a transformer 102, an AC-DC conversion module 103, a first detection module 104, a switching module 105, a third inverter module, a first switch module 106, a first power supply module 107, a second power supply module 108, a second detection module 109, a second switch module 110, and a control module. The third inverter module includes a first bridge arm 111 and a second bridge arm 112.

[0031] The first inverter module 101, transformer 102, AC-DC conversion module 103, first detection module 104, and switching module 105 are connected in sequence. The switching module 105 is connected to the common terminal of the first switch module 106, both ends of the first bridge arm 111, and both ends of the second bridge arm 112. The middle end of the first bridge arm 111 is connected to one end of the second detection module 109, the other end of the second detection module 109 is connected to one end of the second switch module 110, the other end of the second switch module 110 is connected to the middle end of the second bridge arm 112, the first switching terminal of the first switch module 106 is connected to the first power module 107, and the second switching terminal of the first switch module 106 is connected to the second power module 108. The control module is connected to the first inverter module 101, AC-DC conversion module 103, first detection module 104, switching module 105, third inverter module, first switch module 106, second switch module 110, and second detection module 109.

[0032] The control module is used to control the first switch module 106, the second switch module 110, the switching module 105, the first inverter module 101, the AC-DC conversion module 103, and the third inverter module, so as to detect the working status of the first inverter module 101, the AC-DC conversion module 103, the third inverter module, and the switching module 105 respectively according to the detection results of the first detection module 104 and the second detection module 109.

[0033] The system comprises several inverter modules. The first inverter module 101 converts the input DC power into AC power, which is then transmitted through the transformer 102, achieving a primary DC-to-AC conversion and providing controllable power for subsequent circuits. The transformer 102 performs voltage transformation and isolation on the AC power output from the first inverter module 101, meeting voltage level adjustment requirements while ensuring electrical isolation between the primary and secondary sides, thus improving system safety. The AC-DC conversion module 103 further converts the AC power output from the transformer 102 into DC power or other required power forms, working in conjunction with the first inverter module 101 to achieve two-stage inversion, enhancing the flexibility and stability of power conversion. The first detection module 104 detects the output voltage, current, and other parameters of the AC-DC conversion module 103, enabling real-time monitoring of the upstream conversion link and providing data support for subsequent control and fault diagnosis. The switching module 105 switches the output of the first detection module 104 with the common terminal of the bridge arm of the first switching module 106 or the third inverter module, enabling circuit switching between different operating modes and ensuring flexibility in the detection and power supply process. The third inverter module includes a first bridge arm 111 and a second bridge arm 112, which further inverts and regulates the electrical energy input from the switching module 105. The first bridge arm 111 and the second bridge arm 112 operate according to different modes, improving the functional expandability of the inverter device, allowing it to operate in normal power supply mode as well as switch to self-test or special operating condition modes. The first switching module 106 has a common terminal, a first switching terminal, and a second switching terminal. The common terminal is connected to the switching module 105 and can be selectively connected to either the first power module 107 or the second power module 108, enabling flexible switching between different power sources and improving system power supply redundancy and reliability. The first power module 107 provides DC power to the first power channel as a normal power supply, ensuring stable operation of the inverter module. The second power module 108 provides a backup power channel to ensure continuous system operation. The second detection module 109 detects the output parameters of the third inverter module, especially the current or voltage at the middle end of the bridge arm, enabling real-time monitoring of the third inverter module's operating status and ensuring the normality of the inverter drive circuit. The second switching module 110 is located between the second detection module 109 and the second bridge arm 112, and is used to control the on / off state of the detection branch, flexibly switching circuits during the detection process to improve detection accuracy and system safety. The control module comprehensively judges the operating status of each inverter module and the switching module 105 based on the detection results of the first detection module 104 and the second detection module 109, achieving automated detection and intelligent control, reducing manual intervention and fault location time. This embodiment, by introducing multi-level detection modules, switching modules 105, and control modules into a traditional inverter module power supply device, enables flexible switching between different power supplies and different inverter paths, and real-time monitoring of the operating status of each inverter module and key power devices.

[0034] The technical advantages of the solution provided in this embodiment are as follows: The first detection module 104 and the second detection module monitor the operating status of the first inverter module 101, the AC-DC conversion module 103, the third inverter module, and the switching module 105 in real time, avoiding the inefficient traditional method of relying on manual detection. The control module automatically judges and controls each switch and inverter module based on the detection results, significantly improving detection efficiency and accuracy. Through multi-channel detection and controllable switching loops, abnormal modules or branches can be accurately identified. In the production, testing, or operation process, once a fault occurs, it can be located immediately, reducing troubleshooting time. Automated detection replaces traditional manual testing, reducing the investment in testing equipment and manpower. In the maintenance process, rapid fault location shortens the repair cycle and reduces economic losses caused by downtime.

[0035] In one implementation, the control module is used to control the first switch module 106 to switch to the first power module 107, control the second switch module 110 to turn on, control the third inverter module to start working, and detect the working status of the third inverter module according to the detection result of the second detection module 109.

[0036] The control module is configured such that when the third inverter module needs to be tested, it first controls the first switch module 106 to switch to connect with the first power supply module 107 to ensure stable power supply; simultaneously, it controls the second switch module 110 to conduct, enabling the second detection module 109 to form a detection loop with the third inverter module; the control module further controls the third inverter module to start working, achieving inverter operation by driving the switching of the switching transistors in its first bridge arm 111 and second bridge arm 112; during the operation of the third inverter module, the second detection module 109 samples its output current or voltage and feeds the detection results back to the control module; the control module determines whether the third inverter module is in normal working condition based on the detection results of the second detection module 109.

[0037] The technical advantages of this implementation are: controlling the second switch module 110 to conduct, so that the operating status of the third inverter module can be sampled in real time; the control module automatically judges the working status of the third inverter module based on the detection data, avoiding manual intervention; if the detection result is abnormal, the system can issue a fault prompt in a timely manner, helping to quickly locate the problem and reduce maintenance costs.

[0038] As one implementation method, such as Figure 2As shown, the first bridge arm 111 includes a first switch Q1 and a third switch Q3, and the second bridge arm 112 includes a second switch Q2 and a fourth switch Q4. One end of the first switch Q1 and one end of the second switch Q2 are connected together to form a first common terminal. The other end of the first switch Q1 and one end of the third switch Q3 are connected together to form the middle terminal of the first bridge arm 111. The other end of the second switch Q2 and one end of the fourth switch Q4 are connected together to form the middle terminal of the second bridge arm 112. The other end of the third switch Q3 and the other end of the fourth switch Q4 are connected together to form a second common terminal.

[0039] When the control module controls the first switch Q1 and the fourth switch Q4 to be turned on, and controls the second switch Q2 and the third switch Q3 to be turned off, the second detection module 109 obtains the first current value. When the first current value is the first preset current value, the first switch Q1 and the fourth switch Q4 are determined to be normal; when the first current value is not the first preset current value, the first switch Q1 and the fourth switch Q4 are determined to be abnormal.

[0040] When the control module controls the first switch Q1 and the fourth switch Q4 to turn off, and controls the second switch Q2 and the third switch Q3 to turn on, the second current value is obtained by the second detection module 109. When the second current value is the second preset current value, the second switch Q2 and the third switch Q3 are determined to be normal; when the second current value is not the second preset current value, the second switch Q2 and the third switch Q3 are determined to be abnormal.

[0041] In the first detection step, the first switch Q1 and the fourth switch Q4 are turned on, while the second switch Q2 and the third switch Q3 are turned off. At this time, current flows through the first switch Q1 and the fourth switch Q4 to form a loop. The second detection module 109 is a second current sensor HCT2, which collects the current value of this loop to obtain a first current value. If the first current value equals a preset first current value, the first switch Q1 and the fourth switch Q4 are considered to be working normally; if they deviate from the preset value, the two switches are considered to be malfunctioning. In the second detection step, the first switch Q1 and the fourth switch Q4 are turned off, while the second switch Q2 and the third switch Q3 are turned on. At this time, current flows through the second switch Q2 and the third switch Q3 to form a loop. The second detection module collects the current value of this loop to obtain a second current value. If the second current value equals a preset second current value, the second switch Q2 and the third switch Q3 are considered to be working normally; if they deviate from the preset value, the two switches are considered to be malfunctioning.

[0042] The technical advantages of this implementation method are as follows: by controlling the grouping of switching transistors on and off, the functions of the switching transistors in the bridge arm can be verified separately, avoiding the problem of unclear positioning caused by overall testing; combined with the current sampling results of the second detection module, the abnormal switching transistors can be quickly identified, greatly shortening the troubleshooting time; during production testing or operation, the switching transistors can be automatically self-tested, reducing the potential risk of device failure; automatic testing replaces manual testing, reducing equipment downtime and improving operation and maintenance efficiency.

[0043] In one implementation, the control module is also used to control the first switch module 106 to switch the connection to the first power supply module 107, control the AC-DC conversion module 103 and the switching module 105 to start working, and detect the working status of the AC-DC conversion module 103 and the switching module 105 according to the detection result of the first detection module 104.

[0044] The control module is further configured as follows: when it is necessary to detect the AC-DC conversion module 103 and the switching module 105, firstly, the first switch module 106 is controlled to switch to connect with the first power supply module 107 to ensure stable power supply; after the power supply is established, the control module drives the AC-DC conversion module 103 and the switching module 105 to start working, so that their output current forms a detection loop; during the operation of the AC-DC conversion module 103 and the switching module 105, the first detection module 104 samples the loop current in real time and feeds back the sampling result to the control module; based on the detection result of the first detection module 104, the control module determines whether the AC-DC conversion module 103 and the switching module 105 are in normal working condition: when the detection value matches the preset reference value, the AC-DC conversion module 103 and the switching module 105 are determined to be normal; when the detection value does not match the reference value, the corresponding module is determined to be abnormal and a fault prompt is issued.

[0045] The technical advantages of this implementation are as follows: by prioritizing the switching of the first switch module 106 to the first power supply module 107, the power quality during the testing process is ensured, and the reliability of the test is improved; the control module directly drives the AC-DC conversion module 103 and the switching module 105 into the working state without manual intervention, thus improving the testing efficiency; relying on the real-time current sampling of the first detection module 104, it is possible to quickly determine whether the target module is working properly, avoiding misjudgment; this testing method can be used in production testing and operation and maintenance, which can detect fault points in advance, shorten maintenance time, and reduce system operation risks.

[0046] As one implementation method, such as Figure 2As shown, the switching module 105 includes a fifth switch Q5 and a sixth switch Q6, and the AC-DC conversion module 103 includes a seventh switch Q7, an eighth switch Q8, a ninth switch Q9, and a tenth switch Q10. One end of the seventh switch Q7 is connected to one end of the eighth switch Q8 and one end of the first detection module 104. The other end of the first detection module 104 is connected to one end of the fifth switch Q5 and one end of the sixth switch Q6. The other end of the fifth switch Q5 is one end of the AC-DC conversion module 103. The other end of the seventh switch Q7 and one end of the ninth switch Q9 are connected to one end of the transformer 102. The other end of the eighth switch Q8 and one end of the tenth switch Q10 are connected to the other end of the transformer 102. The other end of the ninth switch Q9 is connected to the other end of the tenth switch Q10 and the other end of the sixth switch Q6, thus forming the other end of the AC-DC conversion module 103.

[0047] The control module is also used to control the conduction of the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10, and the turn-off of the sixth switch Q6, the eighth switch Q8, and the ninth switch Q9. According to the third current value obtained by the first detection module 104, when the third current value is the third preset current value, it is determined that the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10 are normal; when the third current value is not the third preset current value, it is determined that the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10 are abnormal.

[0048] The control module is also used to control the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10 to turn off, and the sixth switch Q6, the eighth switch Q8, and the ninth switch Q9 to turn on. According to the fourth current value obtained by the first detection module 104, when the fourth current value is the fourth preset current value, the sixth switch Q6, the eighth switch Q8, and the ninth switch Q9 are determined to be normal; when the fourth current value is not the fourth preset current value, the sixth switch Q6, the eighth switch Q8, and the ninth switch Q9 are determined to be abnormal.

[0049] The control module performs detection according to the following logic: First detection step: The control module drives the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10 to conduct; at the same time, it controls the sixth switch Q6, the eighth switch Q8, and the ninth switch Q9 to turn off; the current forms a loop through the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10; the first detection module 104 is the first current sensor HCT1, which collects the current value as the third current value; if the third current value is equal to the third preset current value, the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10 are determined to be normal; if the detection result deviates from the preset value, the above three are determined to be abnormal. The second detection step: The control module drives the sixth switch Q6, the eighth switch Q8, and the ninth switch Q9 to conduct; at the same time, it controls the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10 to turn off; the current forms a loop through the sixth switch Q6, the eighth switch Q8, and the ninth switch Q9; the first current sensor HCT1 collects the current value as the fourth current value; if the fourth current value is equal to the fourth preset current value, then the sixth switch Q6, the eighth switch Q8, and the ninth switch Q9 are determined to be normal; if the detection result deviates from the preset value, then the above three are determined to be abnormal.

[0050] The technical advantages of this implementation are as follows: by controlling the on / off state of different groups of switching transistors, the working status of two groups of key switching transistors in the AC-DC conversion module 103 can be verified separately, avoiding the problem of overall ambiguity in detection; the current sampling results of the detection module directly correspond to a specific group of switching transistors, thereby quickly locating the specific device combination in abnormal situations; the control module automatically executes the detection process, judges the health status of power devices in real time, and improves the self-diagnostic capability of the system; this detection method can be used in production, debugging, and operation to detect potential faults in advance, reducing failure risks and maintenance costs.

[0051] In the first implementation, the control module is used to control the first switch module 106 to switch the connection to the second power module 108, control the fifth switch Q5 to be turned on, and detect the first voltage value on the switching module 105. When the first voltage value is the voltage value output by the second power module 108, the fifth switch Q5 is determined to be normal; when the first voltage value is not the voltage value output by the second power module 108, the fifth switch Q5 is determined to be abnormal.

[0052] In one embodiment, the control module is configured to detect the fifth switch Q5. The specific process is as follows: The control module first controls the first switch module 106 to switch to connect with the second power module 108, ensuring that the power supply required for the detection process comes from the second power module 108. The control module drives the fifth switch Q5 to conduct, so that the output voltage of the second power module 108 can be transmitted to the other end of the switching module 105 through the fifth switch Q5. The control module obtains a first voltage value by detecting the voltage at the other end of the switching module 105. If the first voltage value is consistent with the output voltage value of the second power module 108, it indicates that the fifth switch Q5 is in a normal conducting state; if the first voltage value is inconsistent with the output voltage value of the second power module 108, it indicates that the fifth switch has failed to conduct normally, and it is determined to be abnormal.

[0053] The technical advantages of this implementation are as follows: by independently controlling the power supply switching and the conduction of the fifth switching transistor, the fifth switching transistor can be tested one by one, avoiding interference with other devices; by directly determining the conduction state of the fifth switching transistor through voltage detection, it is possible to quickly determine whether it has failed, thereby achieving accurate diagnosis of individual switching devices; the detection process is automatically completed inside the circuit, avoiding manual disassembly and testing, and significantly reducing production and maintenance costs; this detection logic can be executed during production, debugging, and operation and maintenance, to detect abnormal devices in advance, reduce the risk of failure, and improve the overall stability of the inverter system.

[0054] like Figure 3 As shown, the first power module 107 includes resistors R20, R21, R22, and R23; capacitors C20, C21, C22, C23, and C24; inductor L5; diode D4; and chip U2. The first power module 107 outputs a 5-volt voltage. The second power module 108 includes resistors R24, R25, R26, R27, R31, R32, R33, R34, R35, and R36; capacitors C25, C26, C27, C28, C29, C30, C31, and C32; diodes D1, D3, D5, D6, and D7; MOSFET Q30; transistor Q31; isolation transformer T1; and chip U1, and outputs a 300-volt voltage.

[0055] The embodiments of the present invention will be described in detail below through specific working processes:

[0056] Step S1: Check if the power transistor and current sensor are normal. Close switch RY2, drive the DSP to issue the command CHECK.ON, and the self-test auxiliary power supply starts working. The DSP drives the first switch Q1 and the fourth switch Q4 to close. At this time, +5V, the first switch Q1, the second current sensor HCT2, switch RY2, inductor L2, the fourth switch Q4, and bus BUS- form a loop. When the hardware function is normal, the loop generates a +5A current. The DSP detects whether the current value sampled by the second current sensor HCT2 is the set value of +5A. If no +5A current value is detected, the circuit is judged to be abnormal, the detection is stopped, and the DSP issues an error message. If a +5A current value is detected, the relevant circuits of the first switch Q1, the fourth switch Q4, and the second current sensor HCT2 are judged to be normal.

[0057] In step S2, the first switch Q1 and the fourth switch Q4 are turned off, while the second switch Q2 and the third switch Q3 are turned on. At this time, +5V, the second switch Q2, inductor L2, switch RY2, the second current sensor HCT2, the third switch Q3, and bus BUS- form a loop. When the hardware functions normally, the loop generates a -5A current value. The DSP detects whether the current value sampled by the second current sensor HCT2 is the set value of -5A. If no -5A current value is detected, the circuit is determined to be abnormal, the detection is stopped, and the DSP issues an error message; if a -5A current value is detected, the circuit related to the second switch Q2 and the third switch Q3 is determined to be normal.

[0058] Step S3: Switch relay RY1 to connect BUS+ to +300V. The DSP checks if the bus voltage is +300V. If the sampling deviation is too large or there is no bus voltage, it is an abnormal state, and the DSP reports an error indicating a bus detection circuit malfunction. If +300V is detected normally, the fifth switch Q5 is driven to conduct, and the BUCKBOOT+ sampling detection circuit is checked to ensure it is +300V. If +300V is detected normally, it is determined that the fifth switch Q5 is driven normally, and the BUCKBOOT+ sampling detection circuit is normal.

[0059] Step S4: Switch relay RY1 to connect BUS+ to +5V. The DSP drives the fifth switch Q5, the seventh switch Q7, and the tenth switch Q10 to conduct. At this time, +5V, the fifth switch Q5, inductor L1, the first current sensor HCT1, the seventh switch Q7, the secondary coil of transformer 102, the tenth switch Q10, and BUS- form a circuit. When the hardware function is normal, the circuit generates a +5A current value. The DSP detects whether the current value sampled by the first current sensor HCT1 is the set value of 5A. If no 5A current value is detected, the circuit is determined to be abnormal, the detection is stopped, and the DSP issues an error message. If a 5A current value is detected, the circuit related to the seventh switch Q7, the tenth switch Q10, and the first current sensor HCT1 is determined to be normal. At this time, the sixth switch Q6 is driven to conduct. If the first current sensor HCT1 does not detect a 5A current value, the circuit function of the sixth switch Q6 is determined to be normal; otherwise, the sixth switch Q6 is determined to be abnormal.

[0060] In step S5, the DSP drives the fifth switch Q5, the eighth switch Q8, and the ninth switch Q9 to conduct. At this time, +5V, the fifth switch Q5, inductor L1, the first current sensor HCT1, the eighth switch Q8, the secondary coil of transformer 102, the ninth switch Q9, and bus BUS- form a loop. When the hardware function is normal, the loop generates a +5A current. The DSP detects whether the current value sampled by the first current sensor HCT1 is the set value of 5A. If no 5A current value is detected, the circuit is determined to be abnormal, the detection is stopped, and the DSP issues an error message. If a 5A current value is detected, the circuit related to the eighth switch Q8 and the ninth switch Q9 is determined to be normal.

[0061] Step S6: No abnormalities are detected. The whole machine sampling and drive power transistor circuit testing are completed.

[0062] Step S7: When starting the battery and boosting the voltage, switch relay RY1 to connect to the second power module 108. The second power module 108 outputs +300V to charge the bus capacitor for soft start, reducing the impact on the circuit during DC-DC startup.

[0063] Example 2

[0064] This second embodiment provides a control method for the inverter module power supply device provided in the first embodiment. The control method includes:

[0065] The system controls the first switch module, the second switch module, the switching module, the first inverter module, the AC-DC conversion module, and the third inverter module to detect the working status of the first inverter module, the AC-DC conversion module, the third inverter module, and the switching module based on the detection results of the first detection module and the second detection module.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. An inverter module power supply device, characterized in that, It includes a first inverter module, a transformer, an AC-DC conversion module, a first detection module, a switching module, a third inverter module, a first switch module, a first power supply module, a second power supply module, a second detection module, a second switch module, and a control module. The third inverter module includes a first bridge arm and a second bridge arm. The first inverter module, the transformer, the AC-DC conversion module, the first detection module, and the switching module are connected in sequence. The switching module is connected to the common terminal of the first switching module, both ends of the first bridge arm, and both ends of the second bridge arm. The middle end of the first bridge arm is connected to one end of the second detection module, the other end of the second detection module is connected to one end of the second switching module, and the other end of the second switching module is connected to the middle end of the second bridge arm. The first switching terminal of the first switching module is connected to the first power module, and the second switching terminal of the first switching module is connected to the second power module. The control module is connected to the first inverter module, the AC-DC conversion module, the first detection module, the switching module, the third inverter module, the first switching module, the second switching module, and the second detection module. The control module is used to control the first switch module, the second switch module, the switching module, the first inverter module, the AC-DC conversion module, and the third inverter module, so as to detect the working status of the first inverter module, the AC-DC conversion module, the third inverter module, and the switching module respectively according to the detection results of the first detection module and the second detection module; The switching module includes a fifth switch and a sixth switch. The AC-DC conversion module includes a seventh switch, an eighth switch, a ninth switch, and a tenth switch. One end of the seventh switch is connected to one end of the eighth switch and one end of the first detection module. The other end of the first detection module is connected to one end of the fifth switch and one end of the sixth switch. The other end of the fifth switch is one end of the AC-DC conversion module. The other end of the seventh switch and one end of the ninth switch are connected to one end of the transformer. The other end of the eighth switch and one end of the tenth switch are connected to the other end of the transformer. The other end of the ninth switch is connected to the other end of the tenth switch and the other end of the sixth switch, thus forming the other end of the AC-DC conversion module. The control module is also used to control the fifth, seventh, and tenth switching transistors to be turned on, and the sixth, eighth, and ninth switching transistors to be turned off. Based on the third current value obtained by the first detection module, when the third current value is a third preset current value, the fifth, seventh, and tenth switching transistors are determined to be normal; when the third current value is not the third preset current value, the fifth, seventh, and tenth switching transistors are determined to be abnormal. The control module is also used to control the fifth, seventh, and tenth switching transistors to turn off, and when the sixth, eighth, and ninth switching transistors are turned on, to obtain a fourth current value based on the first detection module. When the fourth current value is a fourth preset current value, the sixth, eighth, and ninth switching transistors are determined to be normal; when the fourth current value is not the fourth preset current value, the sixth, eighth, and ninth switching transistors are determined to be abnormal.

2. The inverter module power supply device as described in claim 1, characterized in that, The control module is used to control the first switch module to switch its connection to the first power module, control the second switch module to turn on, control the third inverter module to start working, and detect the working status of the third inverter module according to the detection result of the second detection module.

3. The inverter module power supply device as described in claim 2, characterized in that, The first bridge arm includes a first switch and a third switch, and the second bridge arm includes a second switch and a fourth switch. One end of the first switch and one end of the second switch are connected together to form a first common terminal. The other end of the first switch and one end of the third switch are connected together to form the middle end of the first bridge arm. The other end of the second switch and one end of the fourth switch are connected together to form the middle end of the second bridge arm. The other end of the third switch and the other end of the fourth switch are connected together to form a second common terminal.

4. The inverter module power supply device as described in claim 3, characterized in that, When the control module controls the first switch and the fourth switch to be turned on, and controls the second switch and the third switch to be turned off, it obtains a first current value based on the second detection module. When the first current value is a first preset current value, it determines that the first switch and the fourth switch are normal; when the first current value is not the first preset current value, it determines that the first switch and the fourth switch are abnormal. When the control module controls the first and fourth switching transistors to turn off and the second and third switching transistors to turn on, it obtains a second current value based on the second detection module. If the second current value is a second preset current value, the second and third switching transistors are determined to be normal; if the second current value is not the second preset current value, the second and third switching transistors are determined to be abnormal.

5. The inverter module power supply device as described in claim 3, characterized in that, The control module is also used to control the first switch module to switch the connection to the first power module, control the AC-DC conversion module and the switching module to start working, and detect the working status of the AC-DC conversion module and the switching module according to the detection result of the first detection module.

6. The inverter module power supply device as described in claim 1, characterized in that, The control module is used to control the first switching module to switch to the second power module, control the fifth switching transistor to turn on, and detect the first voltage value on the switching module. When the first voltage value is the voltage value output by the second power module, the fifth switching transistor is determined to be normal; when the first voltage value is not the voltage value output by the second power module, the fifth switching transistor is determined to be abnormal.

7. A control method for the inverter module power supply device according to claim 1, characterized in that, The control method includes: The system controls the first switch module, the second switch module, the switching module, the first inverter module, the AC-DC conversion module, and the third inverter module to detect the operating status of the first inverter module, the AC-DC conversion module, the third inverter module, and the switching module based on the detection results of the first detection module and the second detection module.

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