A high-frequency isolated modular inverter

Abstract

This invention belongs to the field of inverter technology, specifically relating to a high-frequency isolated modular inverter, including a microcontroller and a fan located at both ends of a protective enclosure. The microcontroller monitors the external ambient temperature based on a temperature and humidity sensor, and controls the H-bridge driver to adjust the current direction of the Peltier module according to a preset threshold, thereby achieving the switching between cold and hot states of the output terminals. This invention collects temperature and humidity sensor data in real time through the microcontroller and controls the current polarity of the Peltier module based on the H-bridge driver: when the external ambient temperature is higher than the threshold, the output terminals in the energy release chamber start the cooling mode, and simultaneously drive the fan to form an axial through-flow airflow, delivering the cold energy to the electrical module area inside the protective enclosure for cooling; conversely, when the ambient temperature is lower than the set value and the humidity exceeds the standard, the output terminals in the energy release chamber start the heating mode, and the fan delivers heat to the electrical module area inside the protective enclosure for heat preservation and dehumidification.

Description

Technical Field

[0001] This invention belongs to the field of inverter technology, specifically relating to a high-frequency isolated modular inverter. Background Technology

[0002] High-frequency isolated modular inverters achieve energy conversion through high-frequency transformer switching technology, converting DC to AC. The high frequency significantly reduces the size and weight of magnetic components (such as transformers and inductors), while also reducing losses. This achieves electrical isolation between the input (DC side) and output (AC side), which blocks DC components from being injected into the grid, avoids common-mode current interference, and enhances the system's anti-interference capability and safety. Furthermore, it consists of multiple independent functional modules (such as DC / DC boost modules, DC / AC inverter modules, and control modules), supporting flexible expansion, redundant configuration, and convenient maintenance.

[0003] While current high-frequency inverters have improved their anti-interference and scalability through electrical isolation and modular design, they still have poor tolerance to harsh power grid environments and are sensitive to temperature and humidity. This is because the semiconductor devices, capacitors, and magnetic components (high-frequency transformers) inside the high-frequency inverter are extremely sensitive to temperature. Prolonged operation with elevated temperatures will accelerate component aging, while humid environments will cause PCB board solder joints to corrode, insulation materials to degrade, and increase the risk of leakage current. However, high-frequency isolated modular inverters still generally use traditional axial fans for forced air cooling. When the temperature difference between the ambient temperature and the target heat dissipation temperature inside the equipment is less than 10°C, the convective heat transfer capacity will decrease significantly, and the cooling capacity will be obviously insufficient. Moreover, since the inverter enclosure is not completely sealed and there are still gaps such as heat dissipation holes and wiring channels, external moisture can easily penetrate into the equipment and may form condensation on the various electronic components of the inverter, leading to problems such as decreased insulation performance and poor contact. Summary of the Invention

[0004] The purpose of this invention is to provide a high-frequency isolated modular inverter that uses a microcontroller to collect temperature and humidity sensor data in real time and controls the current polarity of the Peltier module based on an H-bridge driver: when the external ambient temperature is higher than a threshold, the output terminal in the energy release chamber starts the cooling mode, synchronously driving fan one to form an axial through airflow, delivering the cooling energy to the electrical module area inside the protective box for cooling; conversely, when the ambient temperature is lower than the set value and the humidity exceeds the standard, the output terminal in the energy release chamber starts the heating mode, and fan one delivers heat to the electrical module area inside the protective box for heat preservation and dehumidification.

[0005] The specific technical solution adopted by this invention is as follows: A high-frequency isolated modular inverter includes a microcontroller and a fan respectively located at the front and rear ends of a protective enclosure. The microcontroller monitors the external ambient temperature based on a temperature and humidity sensor and controls the H-bridge driver to adjust the current direction of the Peltier module according to a preset threshold, thereby realizing the switching between cold and hot states of the output terminals. The fan constructs an internal circulating air path with the protective box and the energy release chamber through the heat dissipation vent, which is used to guide the cold or hot air output from the output terminal to flow axially inside the protective box, thereby achieving temperature regulation and humidity control. The protective box forms an independent external exhaust air path through the external air ducts on both sides, and the rotation of the second fan forms a directional airflow to cool the output terminals inside the external air duct.

[0006] The energy release chamber is fixed to the top of the protective box. Both ends of the protective box are symmetrically provided with heat dissipation vents along the axial direction of the box body, and a port compartment is integrally formed at the tail end. The fan is assembled in the middle of the port compartment and located on one side of the corresponding heat dissipation vent.

[0007] The protective box is formed by three sets of parallel heat-resistant plates to create corresponding independent chambers. The microcontroller is fixed in the middle heat-resistant plate chamber, and the H-bridge driver is symmetrically fixed in the heat-resistant plate chambers on both sides.

[0008] The microcontroller is electrically connected to the H-bridge drivers on both sides via a wire harness, and the temperature and humidity sensor is vertically mounted on the top of the energy release chamber and is connected to the microcontroller via a signal.

[0009] The Peltier module has reversible thermoelectric conversion characteristics and is electrically connected to the top of the H-bridge driver. The Peltier module extends through the output terminals on both sides to the inside of the external duct and between the microcontroller and the H-bridge driver, respectively. When the microcontroller drives the H-bridge driver to be powered in the forward direction, the first output terminal generates Joule heat, and the second output terminal is cooled synchronously; when powered in the reverse direction, the thermal states of the two output terminals switch in opposite directions. The output terminals extend downwards via support feet on the back side and are fixedly connected to the protective box.

[0010] The top of the energy release chamber is provided with an array of ventilation holes, and filter plates are slidably installed inside both the energy release chamber and the external air duct. The filter plate has longitudinal sliding grooves on both sides, which are used to form a sliding fit with the convex rails pre-set on the inner wall of the external air duct; The filter plate has filter holes arranged in an array, and several inclined plates are arranged at intervals on the side facing the air vents.

[0011] The external air duct is fixedly connected to the side wall of the protective box with a heat insulation sheet. The second fan is fixedly installed at the end of the external air duct. The energy release chamber and the external air duct are fixedly provided with a cover plate with matching contour to form a rainproof barrier.

[0012] The protective box is equipped with a support frame assembly inside. The support frame assembly includes two sets of symmetrically arranged rib plate mechanisms. Each set of rib plate mechanisms includes several guide plates arranged at intervals. Ventilation channels are formed between the guide plates. Both ends of the rib plate mechanism face the corresponding heat dissipation vent. The top of the rib plate mechanism is provided with several orthogonally welded bridging plates, which are fixedly connected to the inner wall of the protective box through the bottom plate.

[0013] The technical effects achieved by this invention are as follows: This invention uses a microcontroller to collect temperature and humidity sensor data in real time and controls the current polarity of the Peltier module based on an H-bridge driver: when the external ambient temperature is higher than the threshold, the output terminal in the energy release chamber starts the cooling mode and synchronously drives the fan to form an axial through airflow, which delivers the cold energy to the electrical module area inside the protective box for cooling. When the ambient temperature is lower than the set value and the humidity exceeds the standard, the output terminal in the energy release chamber starts the heating mode. The axial airflow formed by the fan transports heat to the electrical module area inside the protective box for heat preservation and dehumidification. When the output terminals inside the external duct heat up, the second fan can guide airflow to cool them in a specific direction, preventing the hot and cold air near the two output terminals from affecting each other, thus maintaining the overall service life and stable operation of the Peltier module. Attached Figure Description

[0014] Figure 1 This is an overall appearance view of the high-frequency isolated modular inverter provided in the embodiments of the present invention; Figure 2 This is a top cross-sectional view of the protective box provided in the embodiment of the present invention with the cover plate removed; Figure 3 yes Figure 2 A magnified view of a section at point A in the middle; Figure 4 yes Figure 2 A magnified view of a section at point B in the middle; Figure 5 This is a top view of the protective box provided by an embodiment of the present invention with the cover plate removed; Figure 6 This is a structural cross-sectional view of the energy release chamber provided in the embodiments of the present invention; Figure 7 yes Figure 6 A magnified view of a section at point C; Figure 8 This is a diagram showing the front and back structures of the filter plate provided in an embodiment of the present invention.

[0015] The attached diagram lists the components represented by each number as follows: 1. Protective housing; 101. Energy release chamber; 102. External air duct; 103. Port chamber; 104. Fan 1; 105. Fan 2; 106. Heat dissipation vent; 107. Heat-resistant plate; 108. Ventilation hole; 109. Temperature and humidity sensor; 110. Microcontroller; 111. Wiring harness tube; 112. H-bridge driver; 113. Peltier module; 114. Output terminal; 115. Heat insulation sheet; 116. Support leg; 117. Filter plate; 118. Sliding groove; 119. Filter hole; 120. Inclined plate; 121. Cover plate; 122. Guide plate; 123. Bridging plate; 124. Base plate. Detailed Implementation

[0016] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0017] like Figure 1 , Figure 5 As shown, a high-frequency isolated modular inverter includes a microcontroller 110 and a fan 104 respectively located at the two ends of a protective box 1.

[0018] Example 1: See attached document Figures 1-7 The microcontroller 110 monitors the external ambient temperature based on the temperature and humidity sensor 109, and controls the H-bridge driver 112 to adjust the current direction of the Peltier module 113 according to the preset threshold, so as to realize the cold / hot state switching of the output terminal 114. The energy release chamber 101 is fixed to the top of the protective box 1. Inside the protective box 1, three sets of parallel heat-resistant plates 107 form corresponding independent chambers. The microcontroller 110 is fixed in the middle heat-resistant plate 107 chamber, and the H-bridge driver 112 is symmetrically fixed in the heat-resistant plate 107 chambers on both sides. The microcontroller 110 is electrically connected to the H-bridge driver 112 on both sides through the wire harness tube 111. The temperature and humidity sensor 109 is vertically installed on the top of the energy release chamber 101 and is connected to the microcontroller 110. The Peltier module 113 has reversible thermoelectric conversion characteristics and is electrically connected to the top of the H-bridge driver 112. The Peltier module 113 extends through the output terminals 114 on both sides to the inside of the external air duct 102 and between the microcontroller 110 and the H-bridge driver 112, respectively. The output terminal 114 extends downward through the support foot 116 on the back side and is fixedly connected to the protective box 1. When the microcontroller 110 drives the H-bridge driver 112 to be powered in the forward direction, the first output terminal 114 generates Joule heat and the second output terminal 114 is cooled synchronously. When powered in the reverse direction, the thermal states of the two output terminals 114 are switched in opposite directions.

[0019] According to the above structure, the temperature and humidity sensor 109 collects the external ambient temperature in real time and converts it into a digital signal, which is then transmitted to the microcontroller 110. The microcontroller 110 outputs two digital logic signals IN1 / IN2 through the wire harness tube 111, and adjusts the PWM duty cycle of the H-bridge driver 112 in real time through a closed-loop control algorithm to regulate the current direction and power of the Peltier module 113, so that the two output terminals 114 maintain the target temperature respectively. The H-bridge driver 112 is generally a switching combination composed of four power transistors to switch and change the current direction. Furthermore, by adjusting the amplitude of the drive voltage through PWM modulation, gradient control of the cooling / heating capacity of the Peltier module 113 is achieved. When the microcontroller 110 outputs IN1=high level and IN2=low level, the current flows in the forward direction, and the Peltier module 113 controls the output terminal 114 located in the energy release chamber 101 to cool and the output terminal 114 located in the external air duct 102 to heat. When the microcontroller 110 outputs IN1=low level and IN2=high level, the current flows in the reverse direction, and the cooling and heating states of the two output terminals 114 of the Peltier module 113 also change in opposite directions. Furthermore, the two plates of each heat-resistant plate 107 form independent chambers, which are used to house the microcontroller 110, the H-bridge driver 112, and the Peltier module 113, respectively. The heat-resistant plate 107 can be made of materials such as ABS and polyimide composite board, etc., to isolate the heat radiation of the output terminal 114 and ensure the stable operation of the corresponding components. The output terminal 114 is also fixed to the inner wall of the energy release chamber 101 by the support 116 to enhance the structural stability of the output terminal 114. The two output terminals 114 located in the energy release chamber 101 are respectively located at the two heat dissipation vents 106 at the top of the protective box 1, so that the hot and cold air generated by the output terminal 114 can enter the interior of the protective box 1.

[0020] The working principle of this invention is as follows: Based on the Peltier effect, the closed-loop feedback between the temperature and humidity sensor 109 and the microcontroller 110 switches the current direction of the H-bridge driver 112, thereby achieving dynamic switching of the hot and cold polarities of the output terminal 114 in the energy release chamber 101 and the external air duct 102. It can prioritize the activation of cooling mode in high-temperature environments and automatically switch to heating and dehumidification in low-temperature and humid conditions, improving the inverter's environmental adaptability under wide temperature range conditions.

[0021] Example 2: See attached document Figures 1-2 , Figure 5Fan 104 constructs an internal air circulation path with the protective box 1 and the energy release chamber 101 through the heat dissipation port 106, which is used to guide the cold air or hot air output from the output terminal 114 to flow along the internal axis of the protective box 1 to achieve temperature regulation and humidity control. The top of the energy release chamber 101 has an array of ventilation holes 108. The protective box 1 has heat dissipation vents 106 symmetrically opened at both ends along the axial direction of the box body. A port compartment 103 is integrally formed at the tail end. The fan 104 is installed in the middle of the port compartment 103 and is located on one side of the corresponding heat dissipation vent 106. The protective box 1 has a support frame assembly inside. The support frame assembly includes two sets of symmetrically arranged rib plate mechanisms. Each set of rib plate mechanisms includes several guide plates 122 arranged at intervals. Ventilation channels are formed between each guide plate 122. Both ends of the rib plate mechanism face the corresponding heat dissipation vent 106. Several orthogonally welded bridging plates 123 are arranged at intervals on the top of the rib plate mechanism and are fixedly connected to the inner wall of the protective box 1 through the bottom plate 124.

[0022] According to the above structure, from the front end to the rear end of the protective box 1, the ventilation hole 108, the top heat dissipation port 106, the inner cavity of the protective box 1, the bottom heat dissipation port 106, and the fan 104 constitute a through axial air passage. When the fan 104 is started, it creates a negative pressure suction, which causes the external air to enter the energy release chamber 101 through the ventilation hole 108, and diffuses the cold / hot airflow near the output terminal 114 into the box. Furthermore, the rib plate mechanism is welded or bolted to the inner wall of the protective box 1 via the bottom plate 124. The bridging plate 123 serves as the mounting base for the electrical module. The gap between the electrical module and the inner wall of the protective box 1 is divided into independent air channels by several spaced guide plates 122. The guide plates 122 direct the airflow to the bottom of the electrical module, expanding the contact area and improving the cooling / dehumidification effect.

[0023] The working principle of this invention is as follows: the axial through air route consists of a top ventilation hole 108, symmetrical heat dissipation vents 106 and a fan 104, which, together with the guide plate 122 array, decomposes the mainstream airflow into multiple sub-channels, and forces convection to cover the entire surface of the electrical module, eliminating local hot spots and improving the cooling / dehumidification effect.

[0024] Example 3: See attached document Figure 2 , Figures 5-6 , Figure 8 The protective box 1 forms an independent external exhaust air path through the external air ducts 102 on both sides, and the rotation of the fan 105 forms a directional airflow to cool the output terminal 114 inside the external air duct 102. An insulation sheet 115 is fixedly connected to the side wall of the protective box 1 for the external air duct 102. A second fan 105 is fixedly installed at the end of the external air duct 102. A cover plate 121 with a matching profile is fixedly installed above the energy release chamber 101 and the external air duct 102 to form a rainproof barrier. Filter plates 117 are slidably installed inside the energy release chamber 101 and the external air duct 102. Sliding grooves 118 are opened longitudinally on both sides of the filter plate 117 to form a sliding fit with the convex rails preset on the inner wall of the external air duct 102. Filter holes 119 are arrayed through the filter plate 117, and several inclined plates 120 are arranged at intervals on the side facing the ventilation hole 108.

[0025] According to the above structure, the filter plate 117 is slidably inserted into the protective box 1 and the internal convex rail of the external air duct 102 through the sliding groove 118, and is located on the side that fits the ventilation hole 108. After being inserted, it can be connected and fixed to the top of the protective box 1 and the external air duct 102 by bolts. The filter hole 119 can filter dust and impurities in the external air. When the dust-laden airflow hits the inclined plate 120, the particles are separated from the main airflow due to inertia and slide down the inclined surface, which can reduce the risk of filter hole 119 clogging. The two work together to keep the surface of the output terminal 114 clean. Furthermore, the external duct 102 is used to protect the output terminal 114 located inside it. The output terminal 114 will generate heat when it is cooled inside the protective box 1. When the fan 105 at the end of the external duct 102 is started, it generates negative pressure airflow, which can generate directional airflow to exhaust the heat of the output terminal 114 to the outside and keep its operation stable. Furthermore, the material selection for the heat insulation sheet 115 can refer to the heat-resistant plate 107, which can prevent heat radiation from the external air duct 102 to the interior of the protective box 1. The cover plate 121 is fixed to the top of the energy release chamber 101 and located above the temperature and humidity sensor 109, which can prevent rainwater from seeping into the energy release chamber 101 through the ventilation hole 108, and also prevent the temperature and humidity sensor 109 from being exposed to direct sunlight, thus reducing the error of temperature monitoring.

[0026] The working principle of this invention is as follows: the external air duct 102 forms an internal and external dual air passage independently outside the protective box 1, and forms a directional exhaust flow field through the fan 105 to ensure that the waste heat of the output terminal 114 inside is discharged in time, and to block the heat exchange between the internal and external air passages.

[0027] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A high-frequency isolated modular inverter, comprising a microcontroller (110) and a fan (104) respectively disposed at the two ends of a protective enclosure (1), characterized in that: The microcontroller (110) monitors the external ambient temperature based on the temperature and humidity sensor (109), and controls the H-bridge driver (112) to adjust the current direction of the Peltier module (113) according to the preset threshold, so as to realize the cold / hot state switching of the output terminal (114); The fan (104) constructs an internal circulation air path with the protective box (1) and the energy release chamber (101) through the heat dissipation port (106), which is used to guide the cold air or hot air output from the output terminal (114) to flow along the internal axis of the protective box (1) to achieve temperature regulation and humidity control. The protective box (1) forms an independent external exhaust air path through the external air ducts (102) on both sides, and the rotation of the second fan (105) forms a directional airflow to cool the output terminal (114) inside the external air duct (102).

2. The high-frequency isolated modular inverter according to claim 1, characterized in that: The energy release chamber (101) is fixed to the top of the protective box (1). The protective box (1) has heat dissipation vents (106) symmetrically opened at both ends along the axial direction of the box body, and a port compartment (103) is integrally formed at the tail end. The fan (104) is assembled in the middle of the port compartment (103) and located on one side of the corresponding heat dissipation vent (106).

3. The high-frequency isolated modular inverter according to claim 2, characterized in that: The protective box (1) is formed by three sets of parallel heat-resistant plates (107) to form corresponding independent chambers. The microcontroller (110) is fixed in the middle heat-resistant plate (107) chamber, and the H-bridge driver (112) is symmetrically fixed in the heat-resistant plate (107) chambers on both sides.

4. The high-frequency isolated modular inverter according to claim 3, characterized in that: The microcontroller (110) is electrically connected to the H-bridge drivers (112) on both sides via a wire harness tube (111). The temperature and humidity sensor (109) is vertically mounted on the top of the energy release chamber (101) and is connected to the microcontroller (110) via a signal.

5. The high-frequency isolated modular inverter according to claim 4, characterized in that: The Peltier module (113) has reversible thermoelectric conversion characteristics and is electrically connected to the top of the H-bridge driver (112). The Peltier module (113) extends through the output terminals (114) on both sides to the inside of the external duct (102) and between the microcontroller (110) and the H-bridge driver (112). When the microcontroller (110) drives the H-bridge driver (112) to be powered in the forward direction, the first output terminal (114) generates Joule heat and the second output terminal (114) is cooled synchronously; when powered in the reverse direction, the thermal states of the two output terminals (114) are switched in opposite directions. The output terminal (114) extends downward through the support foot (116) on the back side and is fixedly connected to the protective box (1).

6. The high-frequency isolated modular inverter according to claim 5, characterized in that: The top of the energy release chamber (101) is provided with an array of ventilation holes (108), and filter plates (117) are slidably installed inside both the energy release chamber (101) and the external air duct (102). The filter plate (117) has sliding grooves (118) on both sides in the longitudinal direction, which are used to form a sliding fit with the convex rails preset on the inner wall of the external air duct (102); The filter plate (117) has filter holes (119) arranged in an array, and several inclined plates (120) are arranged at intervals on the side facing the air vent (108).

7. The high-frequency isolated modular inverter according to claim 6, characterized in that: The external air duct (102) is fixedly connected to the side wall of the protective box (1) with a heat insulation sheet (115). The second fan (105) is fixedly installed at the end of the external air duct (102). The energy release chamber (101) and the external air duct (102) are fixedly provided with a cover plate (121) with matching contour to form a rainproof barrier.

8. The high-frequency isolated modular inverter according to claim 1, characterized in that: The protective box (1) is equipped with a support frame assembly inside. The support frame assembly includes two sets of symmetrically arranged rib plate mechanisms. Each set of rib plate mechanisms includes several guide plates (122) arranged at intervals. Ventilation channels are formed between each guide plate (122). Both ends of the rib plate mechanism face the corresponding heat dissipation port (106). The top of the rib plate mechanism is provided with several orthogonally welded bridging plates (123), which are fixedly connected to the inner wall of the protective box (1) through the bottom plate (124).

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