Constant power controller

Abstract

The invention relates to the technical field of photovoltaic power generation corollary equipment, in particular to a constant power controller, which comprises an outdoor box, an inverter, a power regulator, a protection box, a side rod, a Hall element, a permanent magnet, a primary side current column, an illumination intensity feedback assembly, a connecting rod assembly, a jacking assembly and a control knob, the illumination intensity feedback assembly is installed on the top of the outdoor box in an attached mode and connected with the power regulator through the controller, and the connecting rod assembly is connected to the bottom of the illumination intensity feedback assembly. The black absorbing coating is adopted to feed back the illumination intensity, and heat is transmitted to the bimetallic strip to enable the bimetallic strip to generate corresponding amplitude deformation, so that the problem that the output voltage and current signals are frequently and greatly adjusted due to the fact that the photovoltaic power generation system is easily influenced by rapidly changing clouds, and the power consumption is reduced is solved. Therefore, the problem of oscillation and even instability of the constant power controller near a power point can be solved.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power generation equipment technology, specifically a constant power controller. Background Technology

[0002] The output power of photovoltaic (PV) solar panels is significantly affected by environmental factors such as sunlight intensity and temperature, exhibiting strong nonlinear characteristics. This volatility leads to unstable power output, impacting the overall system's efficiency and reliability. To ensure stable grid connection and prevent grid interference caused by power fluctuations, a power controller is installed between the PV panels and the grid. The power controller adjusts the output power of the solar panel array in real time, keeping it within a reasonable range and ensuring stable grid-connected operation and power quality. Currently, since PV solar panels generate direct current (DC), constant power controllers are often designed with inverters to convert the DC power into alternating current (AC), allowing direct grid connection.

[0003] Constant power controllers are the core control units in power electronic converters. Their main function is to regulate the operating state of the converter (such as a DC / AC inverter or a DC / DC converter) to ensure that it outputs a stable and preset power value to the load or grid, unaffected by fluctuations in the input source voltage or changes in load characteristics. These controllers are crucial in numerous applications, such as grid-connected photovoltaic power generation, wind power generation, energy storage systems, and industrial power supplies requiring precise power delivery.

[0004] To adapt to changes in light intensity, existing constant power controllers often employ light sensors to monitor light intensity and adjust their voltage and current signals accordingly to ensure a constant power output to the grid. However, when light intensity changes frequently due to rapidly moving clouds, the feedback signal from the light sensor is quite sensitive. This causes the constant power controller to frequently and significantly adjust its output voltage and current signals within a short period, making it prone to oscillations or even instability near the power point. This instability is particularly pronounced when light conditions are weak and the PV curve is relatively flat.

[0005] To address this, a constant power controller is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a constant power controller that uses a black absorbing coating to reflect the light intensity and transfers heat to a bimetallic strip, causing the bimetallic strip to deform accordingly. This solves the problem of oscillations or even instability near the power point caused by frequent and large-scale adjustments of output voltage and current signals due to the susceptibility of photovoltaic power generation systems to rapidly changing clouds. The invention effectively avoids frequent and large-scale adjustments of output voltage and current caused by rapidly moving clouds, even under weak light conditions, thus preventing oscillations and instability near the power point and significantly improving the stability of the constant power controller.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A constant power controller includes an outdoor enclosure, an inverter, a power regulator, a protective enclosure, and a side rod, a Hall element, a permanent magnet, and a primary current column disposed within the protective enclosure. It also includes a light intensity feedback component, a linkage assembly, a lifting assembly, and a control knob. The light intensity feedback component is fitted to the top of the outdoor enclosure and is connected to the power regulator via the controller. The linkage assembly is connected to the bottom of the light intensity feedback component and extends into the protective enclosure. The lifting assembly is installed inside the protective enclosure, and the control knob is installed on the top of the protective enclosure. When the light intensity feedback component adaptively deforms downwards according to the light intensity, it pushes the linkage assembly to move inwards towards the inside of the protective enclosure. The linkage assembly, through the lifting assembly, pushes the Hall element upwards by a set length, and during the downward movement of the linkage assembly, it causes the control knob to rotate by a set angle.

[0008] Since photovoltaic solar panels are located on outdoor rooftops, constant power controllers are typically installed near the solar panels to better convert the DC voltage generated by them, thus shortening the transmission distance. These controllers are usually installed in outdoor distribution boxes (i.e., outdoor boxes).

[0009] Preferably, the light intensity feedback component includes a bimetallic strip, a black absorbing coating, and a limiting block. The two limiting blocks are symmetrically arranged about the connecting rod assembly and are fitted onto the top of the outdoor box. The bimetallic strip is connected between the two limiting blocks, and the black absorbing coating is applied to the surface of the bimetallic strip.

[0010] Preferably, the limiting block includes a vertical block, a compensating spring, a vertical slider, a through rod, a follower rod, and a rotating contact block. The vertical block is attached to the top of the outdoor enclosure. The vertical slider is slidably disposed on the side wall of the vertical block. The compensating spring is connected between the bottom of the vertical slider and the vertical block. The through rod passes through the vertical slider. The follower rod is installed on the side wall of the vertical slider. The rotating contact block is rotatably connected to the top of the follower rod, and the rotating contact block is attached to the side of the bimetallic strip with the larger elastic coefficient.

[0011] Preferably, the linkage assembly includes a base rod, a cross rod, a insert rod, and a stop rod. The base rod is connected to the bottom of the bimetallic strip, the cross rod is connected to the side wall of the base rod, the insert rod is connected to the bottom of the base rod and penetrates through the protective box, and the stop rod is connected to the bottom of the insert rod.

[0012] Preferably, a hemispherical protrusion is installed at the end of the crossbar near the control knob.

[0013] Preferably, the lifting assembly includes a rotating frame, a counterweight, a rotating shaft, a lifting cylinder, and a limiting rod. The rotating shaft and the limiting rod are both installed inside the protective box. The counterweight is rotatably installed on the outer periphery of the rotating shaft. The rotating frame is installed on the outer side of the counterweight. The lifting cylinder is slidably disposed on the outer side of the limiting rod. The lower end surface of the rotating frame is in contact with the lifting cylinder, and its other end is in contact with the abutment rod.

[0014] Preferably, the top of the control knob is fitted with a vertical cylinder, and a slot is provided on the outer periphery of the vertical cylinder, the slot being adapted to the hemispherical protrusion.

[0015] Preferably, the side view section of the slot is set to V-shape.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When this invention is installed in an outdoor photovoltaic power generation system, it can continuously absorb sunlight and convert it into heat. Based on the heat value, it can make corresponding feedback adjustments. This allows for rapid and precise adjustment of the output voltage and current according to the light intensity, achieving constant power regulation. Furthermore, since the heat dissipation from the black absorbing coating takes several seconds, this effectively avoids the problem of rapid changes in light intensity caused by fast-moving clouds, which could lead to frequent and large adjustments in output voltage and current, causing the constant power controller to oscillate or even become unstable near the power point. This significantly improves the stability of the constant power controller when applied to a photovoltaic power generation system and helps extend its service life.

[0017] 2. Through the set light intensity feedback component and control knob, the black absorbing coating can provide feedback on light intensity through thermal effect. Subsequently, the bimetallic sheet deforms and bends downwards to a certain extent under the action of thermal effect, thereby converting the light intensity signal into a physical action signal, which can greatly improve the stability of the constant power controller during use. In addition, when the solar panel is blocked by fast-moving clouds, the black absorbing coating needs a certain amount of time to dissipate heat. During this period of time, its temperature changes regularly, so there is no need to significantly adjust the output voltage and current. This can maintain the stability of the constant power controller during use and prevent the constant power controller from oscillating or even becoming unstable near the power point.

[0018] 3. Through the set linkage assembly and lifting assembly, the physical deformation signal can be amplified under the action of the lifting assembly. Combined with the displacement sensor composed of Hall element, permanent magnet and primary side current column in the protective box, the deformation amplitude of bimetallic strip can be detected. Then, the rotation angle value of control knob can be reversed to avoid the deviation of the angle of control knob when the linkage assembly is displaced, thus fully ensuring the accuracy of constant power controller adjustment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the light intensity feedback component of the present invention; Figure 3 This is a schematic diagram of the structure of the limiting block of the present invention; Figure 4 This is a schematic diagram showing the connection between the protective box and the connecting rod assembly of the present invention; Figure 5 This is a cross-sectional view of the protective box of the present invention; Figure 6 This is a schematic diagram of the crossbar structure of the present invention; Figure 7 This is a schematic diagram of the rotating frame of the present invention; Figure 8 This is a schematic diagram of the structure of the lifting cylinder of the present invention; Figure 9 This is a schematic diagram of the control knob of the present invention.

[0020] In the diagram: 1. Outdoor box; 2. Inverter; 3. Power regulator; 4. Controller; 5. Protective box; 51. Side rod; 52. Hall element; 53. Permanent magnet; 54. Primary current column; 6. Light intensity feedback component; 61. Bimetallic strip; 62. Black absorbing coating; 63. Limit block; 631. Vertical block; 632. Compensating spring; 633. Vertical slider; 634. Through rod; 635. Follower rod; 636. Rotating fitting block; 7. Linkage assembly; 71. Base rod; 72. Horizontal rod; 721. Hemispherical protrusion; 73. Insert rod; 74. Abutment rod; 8. Lifting assembly; 81. Rotating frame; 82. Counterweight; 83. Rotating shaft; 84. Lifting cylinder; 85. Limit rod; 9. Control knob; 91. Vertical cylinder; 92. Slot. Detailed Implementation

[0021] 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 embodiments of the present invention, and not all embodiments. 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.

[0022] Please see Figures 1 to 9 This invention provides a constant power controller, the technical solution of which is as follows: Reference Figure 1 , Figure 4 and Figure 5 A constant power controller includes an outdoor enclosure 1, an inverter 2, a power regulator 3, a protective enclosure 5, and side rods 51, Hall elements 52, permanent magnets 53, and primary current columns 54 disposed within the protective enclosure 5. The power regulator 3 is installed on the inner wall of the outdoor enclosure 1, below the insulation layer of the outdoor enclosure 1. The inverter 2 is installed on the side wall of the power regulator 3. The inverter 2 is used to convert the direct current generated by the photovoltaic power generation module into alternating current. The alternating current is then transmitted to the power grid after signal conditioning by the power regulator 3. The protective enclosure 5 is installed in the outdoor enclosure 1. The inner wall, and the protective box 5 is located within the heat insulation layer. The side rod 51, Hall element 52, permanent magnet 53, and primary current column 54 are all installed inside the protective box 5. When the Hall element 52 is displaced in the vertical direction, its output voltage signal changes because it is displaced within the magnetic field formed by the permanent magnet 53. The signal change value is related to the power adjustment value of the power regulator 3. It also includes a light intensity feedback component 6, a connecting rod assembly 7, a lifting assembly 8, and a control knob 9. The light intensity feedback component 6 is attached to the top of the outdoor box 1, and the light intensity... The light intensity feedback component 6 is connected to the power regulator 3 via the controller 4. The controller 4 has a signal processing circuit inside, which receives dual input signals from the Hall element 52 and the potentiometer of the control knob 9. The controller 4 calculates the current optimized power setting value according to a preset algorithm (e.g., weighted average of the two signals or lookup table) and generates a pulse width modulation (PWM) signal or digital command, which is sent to the power regulator 3. The power regulator 3 adjusts the duty cycle of its internal switching devices accordingly, thereby regulating the output power and realizing closed-loop control. The linkage assembly 7 is connected to the bottom of the light intensity feedback component 6 and extends into the protective box 5. The lifting assembly 8 is installed inside the protective box 5, and the control knob 9 is installed on the top of the protective box 5. When the light intensity feedback component 6 deforms downward according to the light intensity, it pushes the linkage assembly 7 to move inward into the protective box 5. The linkage assembly 7 pushes the Hall element 52 upward by a set length through the lifting assembly 8, and during the downward movement of the linkage assembly 7, it drives the control knob 9 to rotate by a set angle. Then, the control knob 9 feeds back a setting signal related to the intensity to the controller 4.

[0023] Reference Figure 2 In one embodiment of the present invention, the light intensity feedback component 6 specifically includes a bimetallic strip 61, a black absorbing coating 62, and limiting blocks 63. Two limiting blocks 63 are symmetrically arranged about the connecting rod assembly 7 and are fitted onto the top of the outdoor enclosure 1. The bimetallic strip 61 is connected between the two limiting blocks 63, with the side of the bimetallic strip 61 having a larger elastic coefficient facing downwards. The black absorbing coating 62 is coated on the surface of the bimetallic strip 61. When exposed to sunlight, the surface temperature of the black absorbing coating 62 rises according to the light intensity. The black absorbing coating 62 then transfers heat to the bimetallic strip 61 through heat exchange. The bimetallic strip 61 deforms according to its own metallic material properties, corresponding to the temperature of the black absorbing coating 62. That is, the stronger the light intensity, the higher the temperature of the black absorbing coating 62, and the greater the downward bending of the bimetallic strip 61. The bimetallic strip 61 is a long, thin strip. It has a certain deformation range. The bimetallic strip 61 is composed of a 0.5mm thick manganese-nickel-copper alloy and a 0.5mm thick low-carbon steel composite. The total length is 150mm and the width is 20mm. The black absorbing coating 62 is a weather-resistant matte black epoxy paint with a solar absorption rate of not less than 0.95. It adopts a dual configuration. When the bimetallic strip 61 is subjected to a heat flux density of about 1000W / m², the time to reach stable deformation from the ambient temperature (25℃) is about 15 to 20 seconds. The maximum deformation at its center point is about 8mm. This thermal response characteristic can smooth out the power fluctuations caused by ordinary cumulus clouds passing by (the duration is usually less than 10 seconds). This avoids the problem of the constant power controller oscillating or even becoming unstable near the power point due to the large changes in light intensity caused by rapidly moving clouds.

[0024] Reference Figure 3As one embodiment of the present invention, specifically, the limiting block 63 includes a standing block 631, a compensating spring 632, a vertical slider 633, a through rod 634, a follower rod 635, and a rotating fitting block 636. The standing block 631 is attached to the top of the outdoor box 1. The vertical slider 633 is slidably disposed on the side wall of the standing block 631. The compensating spring 632 is connected between the bottom of the vertical slider 633 and the standing block 631. The compensating spring 632 is in a compressed state in the initial state. The through rod 634 is disposed through the vertical slider 633. The follower rod 635 is installed on the side wall of the vertical slider 633. The rotating fitting block 636 is rotatably connected to the top of the follower rod 635, and the rotating fitting block 636 is attached to the side of the bimetallic strip 61 with a larger elastic coefficient. When the bimetallic strip 61 bends downward so that the bottom of the bimetallic strip 61 is located between the two standing blocks 631, the connection part between the bimetallic strip 61 and the rotating fitting block 636 is raised upward. With the combined action of 636, follower rod 635, through rod 634, and vertical slider 633, the bimetallic strip 61 can be fully adapted to deformation and its stability can be ensured at all times. When the bimetallic strip 61 deforms downward, the rotating contact block 636 moves upward and rotates at a corresponding angle. The rotating contact block 636 drives the vertical slider 633 to move upward through the follower rod 635. The vertical slider 633 is restricted by the through rod 634 and keeps moving vertically. Under the action of the compensation spring 632, the gravity of the rotating contact block 636, follower rod 635, through rod 634, and vertical slider 633 can be compensated, thereby avoiding the need to overcome the gravity of the rotating contact block 636, follower rod 635, through rod 634, and vertical slider 633 when the bimetallic strip 61 bends and deforms. This further ensures the accuracy of the bimetallic strip 61 deformation and enables the power regulator 3 to achieve precise signal adjustment.

[0025] Reference Figure 4 , Figure 5 and Figure 6 In one embodiment of the present invention, the linkage assembly 7 specifically includes a base rod 71, a cross rod 72, an insert rod 73, and a stop rod 74. The base rod 71 is connected to the bottom of the bimetallic strip 61, the cross rod 72 is connected to the side wall of the base rod 71, the insert rod 73 is connected to the bottom of the base rod 71 and penetrates through the protective box 5, the stop rod 74 is connected to the bottom of the insert rod 73, and the end of the cross rod 72 not connected to the base rod 71 is close to the control knob 9. A hemispherical protrusion 721 is installed on the end of the cross rod 72 close to the control knob 9. Furthermore, the crossbar 72 is connected to the control knob 9 via the hemispherical protrusion 721. When the bimetallic strip 61 deforms, the heights of the bottom bar 71, crossbar 72, insert bar 73, and abutment bar 74 change together with the deformation of the bimetallic strip 61. When the crossbar 72 moves vertically, it correspondingly moves the control knob 9, thereby adjusting the output signal of the power regulator 3 through the control knob 9. When the abutment bar 74 moves vertically, it correspondingly presses down on the end of the lifting assembly 8 or releases the end of the lifting assembly 8.

[0026] Reference Figure 5 , Figure 7 and Figure 8 As one embodiment of the present invention, specifically, the lifting assembly 8 includes a rotating frame 81, a counterweight 82, a rotating shaft 83, a lifting cylinder 84, and a limiting rod 85. The rotating shaft 83 and the limiting rod 85 are both installed inside the protective box 5. The counterweight 82 is rotatably installed on the outer periphery of the rotating shaft 83. The rotating frame 81 is installed on the outer side of the counterweight 82. The lifting cylinder 84 is slidably disposed on the outer side of the limiting rod 85. The lower end surface of the rotating frame 81 is in contact with the lifting cylinder 84, and its other end is in contact with the abutment rod 74. Under the action of the counterweight 82, the rotating frame 81, the counterweight 82, and the rotating shaft 83 are in a balanced state in the initial state. At this time, the bottom end of the abutment rod 74 and the bottom end of the lifting cylinder 84 are respectively in contact with the two ends of the rotating frame 81, and the lifting cylinder... 84. The side rods 51 are made of ultra-lightweight materials and have been designed to be lightweight. When the bimetallic strip 61 deforms, the bimetallic strip 61 drives the abutment rod 74 to move downward through the bottom rod 71 and the insertion rod 73, thereby pressing down on the end of the rotating frame 81. This causes the end of the rotating frame 81 that is in contact with the lifting cylinder 84 to tilt upward to the corresponding height. The lifting cylinder 84 remains in the vertical direction under the action of the limiting rod 85. The Hall element 52 moves upward with the lifting cylinder 84 through the side rod 51, thereby generating a voltage signal of the corresponding magnitude. This enables reverse detection of the deformation amplitude of the bimetallic strip 61. The deformation amplitude of the bimetallic strip 61 can then be matched with the rotation angle of the control knob 9 to avoid adjustment errors.

[0027] Reference Figure 9 In one embodiment of the present invention, specifically, the top of the control knob 9 is attached to a vertical cylinder 91, and a slot 92 is provided on the outer periphery of the vertical cylinder 91. The slot 92 is adapted to the hemispherical protrusion 721. The side view cross section of the slot 92 is set as V-shaped, and a smooth transition is provided at the bend of the slot 92. When the bimetallic strip 61 deforms, the crossbar 72 moves down through the bottom rod 71. At this time, the position of the hemispherical protrusion 721 in the slot 92 changes as the crossbar 72 moves. Under the cooperation of the slot 92 and the hemispherical protrusion 721, the vertical cylinder 91 rotates, thereby correspondingly adjusting and changing the output signal of the power regulator 3. The shaft of the control knob 9 and a precision The rotary potentiometer is mechanically connected to the handle. The total resistance of the potentiometer is 10kΩ. Its two fixed terminals are connected to the +5V reference voltage and ground (GND) provided by the controller 4, respectively. Its sliding terminal serves as the output and is connected to a digital-to-analog converter (ADC) input channel of the controller 4. When the crossbar 72 drives the control knob 9 to rotate through the vertical cylinder 91, the voltage output to the controller 4 changes linearly between 0-5V. This voltage signal is read by the controller 4 as a direct indication value of intensity for power adjustment calculation. When significant wear occurs between the hemispherical protrusion 721 and the vertical cylinder 91, it prompts the maintenance personnel to replace the vertical cylinder 91.

[0028] Working principle: During normal use, the black absorbing coating 62 is exposed to sunlight, and its surface temperature rises accordingly with the intensity of the light. The heat is transferred to the bimetallic strip 61 through heat exchange. The bimetallic strip 61 deforms according to its own metal material properties, which corresponds to the temperature of the black absorbing coating 62. When the bimetallic strip 61 deforms, it drives the connecting rod assembly 7 to move vertically. During the displacement, the connecting rod assembly 7 adjusts the angle of the control knob 9 accordingly. In addition, the connecting rod assembly 7 presses down on one end of the lifting assembly 8, and the other end of the lifting assembly 8 is raised accordingly. When it is raised, the height of the Hall element 52 is increased. The output voltage of the Hall element 52 is combined with the controller 4 to detect whether the rotation angle of the control knob 9 corresponds to the degree of deformation of the bimetallic strip 61. Specifically, the black absorbing coating 62 absorbs the energy of sunlight, and its temperature rises accordingly. Through heat exchange, the temperature of the bimetallic strip 61 is increased, and the bimetallic strip 61 undergoes a corresponding deformation. The bottom of the bimetallic strip 61 bends downward by a corresponding amount. The crossbar 72 moves downward along with the bottom bar 71 as the bottom of the bimetallic strip 61 moves downward. When the hemispherical protrusion 721 moves vertically with the crossbar 72, its position in the slot 92 changes. Since the slot 92 has a V-shaped cross section, the vertical cylinder 91 will rotate in the corresponding direction by a corresponding angle, thereby adjusting the output signal of the power regulator 3. As the bimetallic strip 61 deforms, the abutment rod 74 moves downward along with the bottom of the bimetallic strip 61 via the insertion rod 73. The abutment rod 74 presses down on one end of the rotating frame 81. Under the action of the rotating shaft 83, the end of the rotating frame 81 that is in contact with the lifting cylinder 84 tilts up. Under the action of the limiting rod 85, the lifting cylinder 84 moves vertically upward. The Hall element 52 moves along with the lifting cylinder 84 via the side rod 51, and the output voltage signal of the Hall element 52 changes. The deformation of the bimetallic strip 61 can be calculated based on the change in the output voltage signal of the Hall element 52. Then, combined with the rotation angle of the control knob 9 corresponding to the adjustment of the power regulator 3, it can be calculated whether the rotation angle of the control knob 9 is accurate. When there is an error in the rotation angle, it indicates that there is wear between the hemispherical protrusion 721 and the vertical cylinder 91, and the hemispherical protrusion 721 and the vertical cylinder 91 need to be replaced in time.

[0029] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A constant power controller, comprising an outdoor enclosure (1), an inverter (2), a power regulator (3), a protective enclosure (5), and a side rod (51), a Hall element (52), a permanent magnet (53), and a primary current column (54) disposed within the protective enclosure (5), characterized in that: It also includes a light intensity feedback component (6), a linkage component (7), a lifting component (8), and a control knob (9). The light intensity feedback component (6) is fitted to the top of the outdoor box (1) and is connected to the power regulator (3) through the controller (4). The linkage component (7) is connected to the bottom of the light intensity feedback component (6) and extends into the protective box (5). The lifting component (8) is installed inside the protective box (5). The control knob (9) is installed on the top of the protective box (5). When the light intensity feedback component (6) deforms downward according to the light intensity, it pushes the linkage component (7) to move inward into the protective box (5). The linkage component (7) pushes the Hall element (52) upward by a set length through the lifting component (8) and drives the control knob (9) to rotate by a set angle during the downward movement of the linkage component (7).

2. The constant power controller according to claim 1, characterized in that: The light intensity feedback component (6) includes a bimetallic strip (61), a black absorption coating (62), and a limiting block (63). The two limiting blocks (63) are symmetrically arranged about the connecting rod assembly (7), and the limiting blocks (63) are fitted and installed on the top of the outdoor box (1). The bimetallic strip (61) is connected between the two limiting blocks (63), and the black absorption coating (62) is coated on the surface of the bimetallic strip (61).

3. The constant power controller according to claim 2, characterized in that: The limiting block (63) includes a standing block (631), a compensating spring (632), a vertical slider (633), a through rod (634), a follower rod (635), and a rotating fitting block (636). The standing block (631) is attached to the top of the outdoor box (1). The vertical slider (633) is slidably disposed on the side wall of the standing block (631). The compensating spring (632) is connected between the bottom of the vertical slider (633) and the standing block (631). The through rod (634) is disposed through the vertical slider (633). The follower rod (635) is installed on the side wall of the vertical slider (633). The rotating fitting block (636) is rotatably connected to the top of the follower rod (635), and the rotating fitting block (636) is attached to the side of the bimetallic strip (61) with a larger elastic coefficient.

4. The constant power controller according to claim 1, characterized in that: The linkage assembly (7) includes a bottom rod (71), a cross rod (72), a plug rod (73), and a stop rod (74). The bottom rod (71) is connected to the bottom of the bimetallic strip (61), the cross rod (72) is connected to the side wall of the bottom rod (71), the plug rod (73) is connected to the bottom of the bottom rod (71) and the plug rod (73) penetrates through the protective box (5), and the stop rod (74) is connected to the bottom of the plug rod (73).

5. The constant power controller according to claim 4, characterized in that: A hemispherical protrusion (721) is installed on one end of the crossbar (72) near the control knob (9).

6. The constant power controller according to claim 4, characterized in that: The lifting assembly (8) includes a rotating frame (81), a counterweight (82), a rotating shaft (83), a lifting cylinder (84), and a limiting rod (85). The rotating shaft (83) and the limiting rod (85) are both installed inside the protective box (5). The counterweight (82) is rotatably installed on the outer periphery of the rotating shaft (83). The rotating frame (81) is installed on the outer side of the counterweight (82). The lifting cylinder (84) is slidably disposed on the outer side of the limiting rod (85). The lower end surface of the rotating frame (81) is in contact with the lifting cylinder (84), and its other end is in contact with the abutment rod (74).

7. The constant power controller according to claim 5, characterized in that: The top of the control knob (9) is fitted with a vertical tube (91), and a slot (92) is provided on the outer periphery of the vertical tube (91). The shape of the slot (92) is adapted to the shape of the hemispherical protrusion (721).

8. The constant power controller according to claim 7, characterized in that: The side view section of the slot (92) is set to V-shape.

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