Variable frequency controller

Abstract

The utility model discloses a frequency conversion controller which is characterized in that the frequency conversion controller comprises a frequency conversion control unit which is located on a first circuit board and comprises a ground wiring position, a power supply input interface and an output interface; the input end of the protection module is electrically connected with a power supply through the first external interface of the first box body, receives the power supply signal, detects the power supply signal, disconnects the power supply signal when the power supply signal is abnormal, and disconnects the power supply signal when the power supply signal is normal. The protection module outputs a power supply signal and provides the power supply signal to the frequency conversion control unit through the output end of the protection module and the power input interface; the protection module and the frequency conversion control unit are located in the first box body, the protection module is fixed in the first space of the first box body through a fixing device, the frequency conversion control unit is located in the second space of the first box body, and the protection module is separated from the first circuit board.

Description

Technical Field

[0001] The utility model relates to the technical field of frequency conversion control, and more specifically, to a frequency conversion controller. Background Art

[0002] Many remote orchards, woodlands and other agricultural lands need artificial irrigation during water shortage seasons. The rapidly developing permanent magnet high-speed energy-saving deep well water pump in China has the advantages of high speed, small size and light weight. It is particularly suitable for extracting groundwater for irrigation in orchards during dry seasons. However, the use of high-speed deep well water pumps usually requires a frequency conversion controller. Since orchards, woodlands, etc. are located in remote areas in the wild, some areas have poor power supply conditions, unstable voltage and frequent power outages. Sometimes generators are needed to generate electricity, and the generators matched by farmers are often not high in power, resulting in violent fluctuations in the power supply voltage provided to the frequency conversion controller. The existing film capacitor type frequency conversion controller cannot adapt to such harsh working conditions.

[0003] In order to enable the equipment to operate stably, it is urgent to design a frequency conversion controller to meet the needs under the above-mentioned conditions of severe power supply voltage fluctuations. Utility Model Content

[0004] The utility model aims to provide a frequency conversion controller to solve the existing technical problems, meet the requirements under the working conditions of low input voltage and severe input voltage fluctuation, and effectively protect the controller's own circuit.

[0005] According to one aspect of the utility model, a frequency conversion controller is provided, comprising: a frequency conversion control unit, located on a first circuit board, the frequency conversion control unit comprising a ground connection position, a power input interface, and an output interface; a protection module, the input end of the protection module is electrically connected to the power supply through the first external interface of the first box body, receives a power supply signal, and detects the power supply signal, when the power supply signal is abnormal, the protection module disconnects the power supply signal, when the power supply signal is normal, the protection module outputs the power supply signal and provides it to the frequency conversion control unit via the output end of the protection module and the power input interface; the protection module and the frequency conversion control unit are located in the first box body, the protection module is fixed in the first space of the first box body by a fixing device, the frequency conversion control unit is located in the second space of the first box body, and the protection module is separated from the first circuit board.

[0006] Optionally, the frequency conversion control unit also includes: a rectifier module, connected to the power input interface, to rectify the electrical signal of the power input interface; a current limiting module, connected between the rectifier module and the first capacitor, to limit the charging current of the first capacitor; a relay module, connected between the rectifier module and the first capacitor; the first capacitor, connected between the current limiting module and the drive module, to supply power to the drive module; a drive module, driving the load via the output interface; a control module, connected to the drive module, the control module controls the drive module; the control module is also connected to the relay module, the control module controls the conduction and shutdown of the relay module.

[0007] Optionally, the protection module is an air switch, and the air switch is arranged in the first box body through a guide rail.

[0008] Optionally, when the protection module detects that the power supply signal is overcurrent, the protection module disconnects the power supply signal; when the protection module detects that the power supply signal is leaking, the protection module disconnects the power supply signal; when the power supply signal is normal, the protection module outputs the power supply signal and provides it to the frequency conversion control unit via the output end of the protection module and the power input interface.

[0009] Optionally, the output interface is connected to a load via a second external interface.

[0010] Optionally, the frequency conversion control unit further includes: a capacitor interface, the capacitor interface is connected to the first capacitor, and the second capacitor is connected to the frequency conversion control unit via a third external interface and the capacitor interface.

[0011] Optionally, the power input interface includes a three-phase AC input wiring position, and the output interface includes a three-phase output wiring position.

[0012] Optionally, the capacitor interface includes a capacitor positive electrode wiring position and a capacitor negative electrode wiring position.

[0013] Optionally, the first external interface and the second external interface are waterproof interfaces.

[0014] Optionally, the third external interface is a waterproof interface.

[0015] Optionally, the first capacitor is a film capacitor, and the second capacitor is an electrolytic capacitor.

[0016] Optionally, the relay module includes a controllable switch and a relay coil, the control module controls the on and off of the controllable switch by controlling whether the relay coil is energized, the controllable switch is connected in parallel with the current limiting module, and the controllable switch short-circuits the current limiting module when it is turned on.

[0017] Optionally, the second capacitor is connected to the capacitor interface via a wire, and the second capacitor is connected in parallel with the first capacitor.

[0018] Optionally, a voltage stabilizer is further included, the voltage stabilizer includes a second circuit board and a second box body, the second circuit board is provided with the second capacitor, and the second capacitor and the second circuit board are sealed in the second box body.

[0019] Optionally, the second box body is connected to the first box body in a pluggable manner.

[0020] Optionally, both the first box body and the second box body are provided with sealing rings.

[0021] The frequency conversion controller provided by the utility model expands the space of the first box body and adds a protection module, and the input power is connected to the first circuit board after passing through the protection module, thereby providing better protection for the first circuit board. Furthermore, by setting a capacitor interface, an external second capacitor can be realized, which significantly enhances the adaptability of the frequency conversion controller to low input voltage and input voltage drastic fluctuation conditions, and expands the application range of the frequency conversion controller. At the same time, due to the use of an external second capacitor, the second capacitor is separated from the high heating environment of the first box body, which is conducive to extending the working life of the second capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings.

[0023] Figure 1 The module schematic diagram of the frequency conversion controller of the first embodiment of the utility model is shown;

[0024] Figure 2 An exploded schematic diagram of a first box body and a second box body of a frequency conversion controller according to a first embodiment of the utility model is shown;

[0025] Figure 3 It shows an exploded schematic diagram of the first box body and the second box body of the frequency conversion controller of the first embodiment of the utility model after being connected;

[0026] Figure 4 The overall schematic diagram of the frequency conversion controller of the first embodiment of the utility model is shown

[0027] Figure 5 An exploded schematic diagram of a first box body of a frequency conversion controller according to a first embodiment of the utility model is shown;

[0028] Figure 6 An exploded schematic diagram of a first box body of a frequency conversion controller according to a second embodiment of the utility model is shown;

[0029] Figure 7It shows a top view of the first box body of the frequency conversion controller of the first embodiment of the utility model after removing the upper cover;

[0030] Figure 8 A schematic diagram showing the back side of the first box body of the frequency conversion controller of the first embodiment of the utility model is shown. DETAILED DESCRIPTION

[0031] The present invention will be described in more detail below with reference to the accompanying drawings. In each of the accompanying drawings, the same elements are represented by similar reference numerals. For the sake of clarity, the various parts in the accompanying drawings are not drawn to scale. In addition, some well-known parts may not be shown.

[0032] It should be understood that when describing a structure, when a component or a module is said to be located "before" another component or another module, it may mean that it is directly located at the front end of the circuit of the other component or another module and connected to it, or that other components or modules are included between it and the other component or another module. In addition, if some modules are used, their positions and adjacency relationships can be adjusted as needed.

[0033] If it is intended to describe a situation where a component or module is directly located before another component or module, this document will use the expression “directly before” or “before and adjacent to”.

[0034] Many specific details of some embodiments of the present invention are described below, such as the specific circuit composition of the module, the component model, quantity and connection relationship, so as to more clearly understand the present invention. However, as those skilled in the art can understand, the present invention can be implemented without following these specific details.

[0035] The present invention may be embodied in various forms, some examples of which will be described below.

[0036] Figure 1 A module schematic diagram of a frequency conversion controller of the first embodiment of the utility model is shown; the frequency conversion controller includes a protection module 24, a frequency conversion control unit and a voltage stabilizer, wherein the frequency conversion control unit is located on a first circuit board 110, the protection module 24 and the first circuit board 110 are located, for example, in a first box body, and the voltage stabilizer includes, for example, a second box body and a second circuit board 120 located in the second box body.

[0037] The power supply 200 of the frequency conversion controller is, for example, a three-phase AC power supply, including three-phase power supply of R, S, and T; the load of the frequency conversion controller is, for example, a motor 300. The first circuit board 110 and the protection module 24 are, for example, both located in the first box body, the protection module 24 is fixed in the first space of the first box body by a fixing device, the first circuit board 110 is located in the second space of the first box body, and the first circuit board 110 and the protection module 24 are separately arranged, and the power supply 200 is connected to the first circuit board 110 after passing through the protection module 24; specifically, the protection module 24 is, for example, an air switch, connected in a three-phase four-wire manner, and the grounding E and R, S, and T are all connected to the wiring positions on the first circuit board 110 after passing through the protection module 24. The protection module 24 can provide overcurrent protection and leakage protection functions to protect the first circuit board 110. Specifically, when the protection module 24 detects that the power supply signal is overcurrent, the protection module 24 disconnects the power supply signal; when the protection module 24 detects that the power supply signal is leaking, the protection module 24 disconnects the power supply signal; when the power supply signal is normal, the protection module 24 outputs the power supply signal and provides it to the frequency conversion control unit via the output end of the protection module 24 and the power input interface 111. The second circuit board 120 is, for example, located in the second box body. Among them, the frequency conversion control unit on the first circuit board 110 includes a power input interface 111, a rectifier module 112, a current limiting module 113, a first capacitor 114, a capacitor interface 115, a relay module 116, a control module 117, a drive module 118 and an output interface 119; the second circuit board 120 includes a second capacitor 121, and the positive electrode P+ and the negative electrode N- of the second capacitor 121 on the second circuit board 120 are respectively connected to the capacitor interface 115 of the first circuit board 110 through wires, so that the positive electrode P+ and the negative electrode N- of the first capacitor 114 are respectively connected to the positive electrode P+ and the negative electrode N- of the second capacitor 121, so as to realize the parallel connection of the second capacitor 121 and the first capacitor 114. Furthermore, the negative electrode of the capacitor interface 115 is also connected to the rectifier module 112. The first capacitor 114 is, for example, a thin film capacitor, and the second capacitor 121 is, for example, an electrolytic capacitor.

[0038] Specifically, in the first circuit board 110, the power input interface 111 is connected to the rectifier module 112, and the output of the rectifier module 112 is divided into two branches, one of which is connected to the current limiting module 113, and the other is connected to the relay module 116. The current limiting module 113 and the relay module 116 are both connected to the first capacitor 114. The first capacitor 114 is connected in parallel with the second capacitor 121 and the first capacitor 114 is connected to the drive module 118 to provide power for the drive module 118. The control module 117 is connected to the relay module 116 and the drive module 118. The control module 117 is used to control the relay module 116 and the drive module 118. The drive module 118 is connected to the output interface 119, which is, for example, a three-phase output interface, including three phases U, V, and W, which are respectively connected to each phase of the motor 300. Furthermore, the relay module 116 includes a controllable switch for controlling the on and off of the busbar, and a relay coil. The control module 117 can control the on and off of the controllable switch by controlling whether the relay coil is energized, thereby connecting or disconnecting the busbar.

[0039] The power supply 200 is connected to the rectifier module 112 inside the frequency conversion controller through the protection module 24 and the power input interface 111 in sequence. The power supply 200 provides alternating current, for example. The alternating current outputs direct current after passing through the rectifier module 112. The direct current is supplied to the first capacitor 114 and the drive module 118 through the current limiting module 113 or the relay module 116.

[0040] The operation of the frequency conversion controller includes: in the initial state, the first capacitor 114 is not fully charged, the control module 117 controls the controllable switch in the relay module 116 to be disconnected, the direct current after passing through the rectifier module 112 is limited by the current limiting module 113, and a small current is charged to the first capacitor 114 until it is fully charged;

[0041] When the first capacitor 114 is fully charged, the control module 117 controls the controllable switch in the relay module 116 to close. Since the relay module 116 is connected in parallel with the current limiting module 113, the current limiting module 113 is short-circuited, and the DC power is supplied to the first capacitor 114 and the driving module 118 through the controllable switch in the relay module 116. Since the current on the line is not limited, the current increases compared to when passing through the current limiting module 113, and the driving ability of the motor 300 is improved. The driving module 118 drives the motor to work via the output interface 119.

[0042] Figure 2 and Figure 3 The exploded schematic diagram of the first box body and the second box body of the frequency conversion controller of the first embodiment of the utility model and the exploded schematic diagram after being connected are respectively shown; Figure 2 and Figure 3It can be seen that the first box body includes a first box body upper cover 1 and a first box body lower shell 7. The first circuit board 110 in the first box body is provided with a wiring position 2 on one side thereof. The wiring position 2 includes, for example, a plurality of wiring positions. Specifically, the plurality of wiring positions include, from left to right, the following: earth wiring position, power input interface (three-phase alternating current R, S, T input wiring position), capacitor interface (capacitor positive wiring position and capacitor negative wiring position), output interface (three-phase output U, V, W wiring position); the first box body lower shell 7 is provided with waterproof interfaces 3, 4, 5, wherein the waterproof interface 3 corresponds to, for example, the earth wiring position and the power input interface, the waterproof interface 4 corresponds to, for example, the capacitor interface, the waterproof interface 5 corresponds to, for example, the output interface, and the interface 6 is, for example, other auxiliary interfaces. The external wires (for example, the capacitor positive lead 9 and the capacitor negative lead 8) pass through the corresponding waterproof interfaces and enter the first box body, and are fixedly connected to the wiring position 2 by the screws on the wiring position 2 and realize the corresponding electrical connection. The power supply line and the grounding line enter the first box body through the waterproof interface 3 and are connected to the protection module 24. After passing through the protection module 24, they are connected to the wiring position corresponding to the first circuit board 110. Specifically, the protection module 24 is, for example, arranged at the lower part of the first circuit board 110 closer to the waterproof interface. The protection module 24 is fixed to the first box body lower shell 7 through the guide rail 23. The second box body includes a second box body upper cover 12 and a second box body lower shell 10. One end of the capacitor negative lead 8 and the capacitor positive lead 9 are, for example, welded and connected to the second circuit board 120 through the waterproof interface of the second box body. The other end of the capacitor negative lead 8 and the capacitor positive lead 9 are connected to the capacitor interface through the waterproof interface 4 of the first box body. Specifically, the capacitor negative lead 8 and the capacitor positive lead 9 are provided with a connection terminal at one end connected to the capacitor interface. The connection terminal is, for example, a nickel sheet. When the waterproof interface 4 is loosened, the wire with the nickel sheet passes through the waterproof interface 4, and the nickel sheet is plugged into the wiring position of the capacitor interface of the first circuit board 110 to realize the connection between the second capacitor and the first capacitor.

[0043] The wire for power supply input is a wire including three R, S, T phase wires and one ground wire E. When the waterproof interface 3 is loosened, the wire passes through the waterproof interface 3 and is connected to the R, S, T, E input terminals of the protection module 24. The corresponding output terminal of the protection module 24 is connected to the R, S, T input wiring positions of the power input interface of the first circuit board 110. Specifically, for example, the corresponding electrical connection is achieved by setting a wire and tightening and fixing it with screws. The output wire connected to the load is, for example, a wire including three U, V, W phase wires. When the waterproof interface 5 is loosened, the wire passes through the waterproof interface 5 and is tightened and fixed with the screws on the U, V, W output wiring positions of the output interface to achieve the corresponding electrical connection. After the connection is completed, the waterproof interfaces 3, 4, 5 are tightened to seal.

[0044] The second circuit board 120 is provided with a second capacitor 121, and the second circuit board 120 corresponds to the mounting column of the second box body lower shell 10 through the positioning hole, and is connected and fixed by screws, and the second capacitor 121 in the second box body is connected in parallel with the first capacitor in the first box body through the capacitor negative lead 8 and the capacitor positive lead 9. Of course, the second capacitor 121 may not be sealed in the second box body.

[0045] Figure 4 The overall schematic diagram of the frequency conversion controller of the first embodiment of the utility model is shown. The first box body and the second box body respectively seal the first circuit board 110 and the second circuit board 120 therein. Specifically, the first box body and the second box body are both waterproof, and a sealing ring is provided between the upper cover and the lower shell for sealing, and each interface is a waterproof interface, so that the first box body and the second box body meet the waterproof requirements of IP54 to meet the harsh working conditions such as deep wells.

[0046] Figure 5 An exploded schematic diagram of the first box body of the frequency conversion controller of the first embodiment of the utility model is shown; the first box body of the first embodiment includes a first box body upper cover 1, a first box body lower shell 7 and waterproof interfaces 3 to 6 located below the first box body lower shell 7. When the first box body is hung on the wall, the waterproof interface opens downward, which is conducive to waterproofing and dustproofing. The first box body is lengthened so that it can accommodate a protection module 24 in addition to the first circuit board 110, that is, it is extended on one side of the wiring position 2 of the first circuit board 110, and a guide rail 23 is set in the lengthened area, and the protection module 24 is set on the guide rail 23. The protection module 24 is, for example, an air switch. Since the air switch has a certain height, the first box body is also heightened. The air switch 24 is fixed to the guide rail 23 by a buckle. After the three-phase AC wire and the earth wire are connected to the first box body, they must pass through the protection module 24 before they can be connected to the first circuit board 110. The protection module 24 is equivalent to the protection located between the power supply and the power input interface. By adding the protection module 24, the frequency conversion controller can be provided with corresponding self-protection capabilities, and the space required for additional distribution cabinets is saved, thereby reducing the overall volume and cost. Furthermore, in this embodiment, a sealing groove 21 is provided on the contact surface of the first box body lower shell 7 opposite to the first box body upper cover 1. The sealing groove 21 is, for example, arranged around the entire contact surface. A sealing strip 22 is provided in the sealing groove 21. The sealing strip 22 can be made of rubber material, for example, so that the sealing effect between the first box body upper cover 1 and the first box body lower shell 7 is better, thereby achieving IP54 protection capability.

[0047] Figure 6An exploded schematic diagram of the first box body of the frequency conversion controller of the second embodiment of the utility model is shown; the difference between the second embodiment and the first embodiment is that the first box body is no longer provided with a waterproof interface 4 corresponding to the capacitor interface. Since the first box body has been lengthened and heightened, a second capacitor and other structures can be directly provided in the first box body. The other parts of the second embodiment are similar to the first embodiment and are not repeated here.

[0048] Figure 7 The schematic diagram of the top view of the first box body of the frequency conversion controller of the first embodiment of the utility model after removing the upper cover is shown; Figure 7 It can be seen that the first circuit board 110 is located in the upper area of ​​the first box body, the screws 25 at both ends of the guide rail 23 pass through the screw holes at the bottom of the guide rail and the first box body lower shell 7 and are tightened to fix it below the first circuit board 110, and the protection module 24 is set on the guide rail 23 by snapping; the earth connection and the power input line, for example, enter the first box body through the waterproof interface 3 and are connected to the input end of the protection module 24 by screws, the output end of the protection module 24 corresponds to the input end one by one, and the corresponding output end of the protection module 24 is connected to the corresponding wiring position on the wiring position 2 in the first circuit board 110.

[0049] Figure 8 FIG. 1 is a schematic diagram showing the back side of the first box body of the frequency conversion controller of the first embodiment of the utility model. Figure 8 As shown, the back of the first box body is also divided into a first area 27 located at the upper part corresponding to the first circuit board 110, and a second area 28 located at the lower part corresponding to the protection module 24. Specifically, the first area 27 is provided with a heat dissipation fin structure, for example, to enhance the heat dissipation capacity of the area; the second area 28 is flat as a whole, but has a protruding structure 26 at the position corresponding to the screw 25 of the fixed guide rail 23, so as to prevent the screw from penetrating the first box body lower shell 7 and affecting the sealing performance of the first box body. Further, the first box body upper cover 1 and the first box body lower shell 7 are both die-casted integrally with aluminum materials, for example, and have a simple structure, are easy to produce, and have good sealing performance and corrosion resistance.

[0050] The frequency conversion controller provided by the utility model expands the space of the first box body and adds a protection module, and the input power is connected to the first circuit board after passing through the protection module, thereby providing better protection for the first circuit board. Furthermore, by setting a capacitor interface, an external second capacitor can be realized, which significantly enhances the adaptability of the frequency conversion controller to low input voltage and input voltage drastic fluctuation conditions, and expands the application range of the frequency conversion controller. At the same time, due to the use of an external second capacitor, the second capacitor is separated from the high heating environment of the first box body, which is conducive to extending the working life of the second capacitor.

[0051] In the above description, the technical details such as the position combination and connection mode of each component are not described in detail. However, those skilled in the art should understand that various technical means can be used to form the required connection relationship, etc. In addition, in order to have the same function, those skilled in the art can also design a structure that is not completely the same as the structure described above. In addition, although each embodiment is described above separately, this does not mean that the measures in each embodiment cannot be used in combination to advantage.

[0052] The embodiments of the present invention are described above. However, these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Without departing from the scope of the present invention, a person skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A frequency conversion controller, characterized in that: include: A frequency conversion control unit is located on the first circuit board, and the frequency conversion control unit includes a ground connection position, a power input interface, and an output interface; A protection module, wherein the input end of the protection module is electrically connected to the power supply through the first external interface of the first box body, receives a power supply signal, and detects the power supply signal. When the power supply signal is abnormal, the protection module disconnects the power supply signal. When the power supply signal is normal, the protection module outputs the power supply signal and provides it to the frequency conversion control unit via the output end of the protection module and the power input interface; The protection module and the frequency conversion control unit are located in the first box body, the protection module is fixed in the first space of the first box body by a fixing device, the frequency conversion control unit is located in the second space of the first box body, and the protection module is separated from the first circuit board.

2. The frequency conversion controller according to claim 1, characterized in that: The frequency conversion control unit also includes: A rectifier module, connected to the power input interface, for rectifying the electrical signal of the power input interface; A current limiting module, connected between the rectifier module and the first capacitor, to limit the charging current of the first capacitor; A relay module is connected between the rectifier module and the first capacitor; A first capacitor is connected between the current limiting module and the driving module to supply power to the driving module; A driving module, driving a load via the output interface; A control module is connected to the driving module, and the control module controls the driving module; the control module is also connected to the relay module, and the control module controls the on and off of the relay module.

3. The frequency conversion controller according to claim 1, characterized in that: The protection module is an air switch, and the air switch is arranged in the first box body through a guide rail.

4. The frequency conversion controller according to claim 1, characterized in that: When the protection module detects an overcurrent in the power supply signal, the protection module disconnects the power supply signal; When the protection module detects a power supply signal leakage, the protection module disconnects the power supply signal; When the power supply signal is normal, the protection module outputs the power supply signal and provides it to the frequency conversion control unit via the output end of the protection module and the power input interface.

5. The frequency conversion controller according to claim 1, characterized in that: The output interface is connected to the load through the second external interface.

6. The frequency conversion controller according to claim 2, characterized in that: The frequency conversion control unit further includes: a capacitor interface, the capacitor interface is connected to the first capacitor, and the second capacitor is connected to the frequency conversion control unit via a third external interface and the capacitor interface.

7. The frequency conversion controller according to claim 1, characterized in that: The power input interface includes a three-phase AC input wiring position, and the output interface includes a three-phase output wiring position.

8. The frequency conversion controller according to claim 6, characterized in that: The capacitor interface includes a capacitor positive electrode wiring position and a capacitor negative electrode wiring position.

9. The frequency conversion controller according to claim 5, characterized in that: The first external interface and the second external interface are waterproof interfaces.

10. The frequency conversion controller according to claim 6, characterized in that: The third external interface is a waterproof interface.

11. The frequency conversion controller according to claim 6, characterized in that: The first capacitor is a film capacitor, and the second capacitor is an electrolytic capacitor.

12. The frequency conversion controller according to claim 2, characterized in that: The relay module includes a controllable switch and a relay coil. The control module controls the on and off of the controllable switch by controlling whether the relay coil is energized. The controllable switch is connected in parallel with the current limiting module. When the controllable switch is turned on, the current limiting module is short-circuited.

13. The frequency conversion controller according to claim 6 or 8, characterized in that: The second capacitor is connected to the capacitor interface through a wire, and the second capacitor is connected in parallel with the first capacitor.

14. The frequency conversion controller according to claim 13, characterized in that: The invention also includes a voltage stabilizer, which includes a second circuit board and a second box body, the second circuit board is provided with the second capacitor, and the second capacitor and the second circuit board are sealed in the second box body.

15. The frequency conversion controller according to claim 14, characterized in that: The second box body is connected to the first box body in a pluggable manner.

16. The frequency conversion controller according to claim 14, characterized in that: The first box body and the second box body are both provided with sealing rings.

Images