Electronic control system and heating and ventilation system

Abstract

Disclosed in the present application are an electronic control system and a heating and ventilation system. The electronic control system comprises: a valve driving circuit, which is connected to a valve assembly, and is configured to drive the valve assembly to act; a control circuit, which is connected to the valve driving circuit, and is configured to control the valve driving circuit; a rectification circuit, wherein an output of the rectification circuit is divided into two paths, one path of the output of the rectification circuit is connected to the valve driving circuit and the control circuit; and a standby power supply circuit, which comprises a charging circuit, an energy storage module and a boosting circuit which are connected in sequence. The control circuit is further connected to the charging circuit and the boosting circuit, the other path of the output of the rectification circuit is connected to the charging circuit so as to charge the energy storage module by means of the charging circuit to implement energy storage, and the boosting circuit is connected to the valve driving circuit and the control circuit, and is configured to supply power to the valve driving circuit and the control circuit when the rectification circuit is de-energized; and when the rectification circuit is de-energized, the boosting circuit works, and the boosting circuit can boost a positive voltage of the energy storage module and then supply power to the control circuit and the valve driving circuit.

Description

Electric control system and heating and ventilation system

[0001] The present application claims priority to the Chinese patent application No. 202410676555.1, filed on May 28, 2024, and entitled "Electric control system and heating and ventilation system", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of air conditioners, and in particular to an electric control system and a heating and ventilation system. BACKGROUND

[0003] In the related art, an electric control board of an air conditioning system is configured to control the operation of a valve. When the air conditioning system is unexpectedly powered off, the valve cannot be closed, and thus there is a risk of refrigerant leakage. In some improved schemes, an energy storage board is additionally provided in the air conditioning system. The energy storage board can store a certain amount of electricity, and when the air conditioning system is powered off, the energy storage board can drive the electronic expansion valve to close, so as to improve the safety performance.

[0004] However, the electric control board and the energy storage board are both provided with a rectifier module, and thus the cost is relatively high. SUMMARY

[0005] Embodiments of the present application provide an electric control system and a heating and ventilation system, which can reduce the occupied space and reduce the cost.

[0006] In a first aspect, an electric control system of a heating and ventilation system is provided, the heating and ventilation system comprising a refrigerant circuit, a valve assembly being provided on the refrigerant circuit, the electric control system comprising: a valve driving circuit, connected with the valve assembly, configured to drive the valve assembly to operate; a control circuit, connected with the valve driving circuit, configured to control the valve driving circuit; a rectifier circuit, an output of the rectifier circuit being divided into two paths, one path of the output of the rectifier circuit being connected with the valve driving circuit and the control circuit, configured to rectify alternating current into direct current and supply power to the valve driving circuit and the control circuit when power is not cut off; a backup power supply circuit, comprising a charging circuit, an energy storage module and a voltage boosting circuit connected in sequence, the control circuit being further connected with the charging circuit and the voltage boosting circuit, the other path of the output of the rectifier circuit being connected with the charging circuit, so as to charge the energy storage module through the charging circuit, the voltage boosting circuit being connected with the valve driving circuit and the control circuit, configured to supply power to the valve driving circuit and the control circuit when the rectifier circuit is powered off.

[0007] In some exemplary embodiments, the valve driving circuit, the rectifier circuit, the control circuit and the backup power supply are provided on the same circuit substrate, or are provided on at least two different circuit substrates.

[0008] In some example embodiments, the electric control system further comprises: a main control substrate, the control circuit and the valve drive circuit are arranged on the main control substrate; a power supply substrate is arranged apart from the main control substrate, and the backup power supply circuit is arranged on the power supply substrate; and the rectifier circuit is arranged on the main control substrate or the power supply substrate.

[0009] In some example embodiments, the rectifier circuit is arranged on the power supply substrate, and an interface for connecting the rectifier circuit is reserved on the main control substrate.

[0010] In some example embodiments, the rectifier circuit is arranged on the power supply substrate, and the power supply substrate is vertically installed, and the projection of the energy storage module along the height direction is arranged apart from the projection of the rectifier module along the height direction.

[0011] In some example embodiments, the same board surface of the power supply substrate comprises a high-voltage installation area and a low-voltage installation area, the rectifier circuit is installed in the high-voltage installation area, and the backup power supply circuit is installed in the low-voltage installation area.

[0012] In some example embodiments, the electric control system further comprises: a power failure detection circuit arranged on the main control substrate and connected with the control circuit and the input end or the output end of the rectifier circuit, and arranged to detect whether the rectifier circuit is powered off; and the control circuit is arranged to issue an instruction to control the valve assembly to close when the power failure detection circuit detects that the rectifier circuit is powered off.

[0013] In some example embodiments, when the heating and ventilation system is in a closed state and the rectifier circuit is not powered off, the control circuit is further arranged to control the rectifier circuit and the charging circuit to be closed, control the boost circuit to work, and control the valve drive circuit to perform a valve closing operation to perform self-checking on the backup power supply circuit.

[0014] In some example embodiments, the electric control system further comprises: a leak detection sensor connected with the control circuit, and the control circuit is arranged to issue an instruction to control the valve assembly to close when the leak detection sensor detects that the refrigerant in the refrigerant circuit leaks.

[0015] In some example embodiments, the refrigerant circuit comprises a high-pressure gas pipe, a low-pressure gas pipe, and a liquid pipe, the valve assembly comprises a high-pressure gas valve arranged on the high-pressure gas pipe, a low-pressure gas valve arranged on the low-pressure gas pipe, and a liquid valve arranged on the liquid pipe, and the capacity of the energy storage module can drive the valve assembly to switch from a fully open state to a fully closed state.

[0016] In some example embodiments, one output of the rectifier circuit is connected to at least two of the valve drive circuits, and the rectifier circuit is capable of supplying power to at least two of the valve drive circuits simultaneously.

[0017] In some example embodiments, the energy storage module comprises a super capacitor, and the charging circuit comprises: a general buck controller connected to one output of the rectifier circuit; a sampling module having a first end connected to an output of the general buck controller and a second end connected to a positive pole of the energy storage module; an amplification module having a positive input end connected to the first end of the sampling module and a negative input end connected to the second end of the sampling module; a buck feedback module having an input end connected to an output of the amplification module, a controlled end connected to the second end of the sampling module, and an output end connected to a feedback end of the general buck controller.

[0018] In some example embodiments, the boost circuit comprises: a boost control module connected to a positive pole of the energy storage module; a boost enable module having one end connected to an output of the boost control module and the other end connected to an enable end of the boost control module; a boost feedback module having one end connected to the output of the boost control module and the other end connected to a feedback end of the boost control module; and an output voltage adjustment module connected to the control circuit and to the boost feedback module, and configured to adjust a voltage fed back to the feedback end by the boost feedback module.

[0019] In some example embodiments, the electronic control system further comprises a discharging circuit disposed on the power supply substrate, the discharging circuit being connected in parallel to an output of the boost circuit, and the discharging circuit being configured to discharge the energy storage module.

[0020] In some example embodiments, the electronic control system further comprises an electric quantity display circuit disposed on the power supply substrate and connected to the energy storage module, and configured to display a current electric quantity of the energy storage module.

[0021] In some example embodiments, the electric quantity display circuit comprises a plurality of parallel sub-display circuits, and the plurality of sub-display circuits are controlled to be illuminated by different selected positive pole voltages of the energy storage module.

[0022] In some example embodiments, the electronic control system further comprises a filter circuit connected to the rectifier circuit, and configured to filter alternating current input to the rectifier circuit, and the filter circuit is disposed on the main control substrate or the power supply substrate where the rectifier circuit is disposed.

[0023] Secondly, embodiments of this application provide a heating, ventilation, and air conditioning system, including: an outdoor unit; a refrigerant circuit connected to the outdoor unit; an indoor unit connected to the outdoor unit via the refrigerant circuit via a valve assembly disposed on the refrigerant circuit; and an electronic control system, wherein the valve drive circuit is connected to the valve assembly.

[0024] Based on the embodiments of this application, the output of the rectifier circuit is divided into two paths. One output of the rectifier circuit is connected to the valve drive circuit and the control circuit. This output is configured to rectify the AC power into DC power and supply power to the valve drive circuit and the control circuit when the power is not interrupted. The other output of the rectifier circuit is connected to the charging circuit to charge and store energy for the energy storage module. The boost circuit is connected to the valve drive circuit and is configured to supply power to the valve drive circuit and the control circuit when the rectifier circuit is interrupted. Since the electronic control system only requires a single rectifier circuit, it occupies less space and has a lower cost. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 is a schematic diagram of the modular structure of a heating, ventilation and air conditioning system in one embodiment of this application;

[0027] Figure 2 is a schematic diagram of the modular structure of a heating, ventilation and air conditioning system in another embodiment of this application;

[0028] Figure 3 is a schematic diagram of the module structure of the electronic control system in one embodiment of this application;

[0029] Figure 4 is a schematic diagram of the module structure of the electronic control system in one embodiment of this application;

[0030] Figure 5 is a schematic diagram of the module structure of the electronic control system in another embodiment of this application;

[0031] Figure 6 is a schematic diagram of the circuit structure of the electronic control system in another embodiment of this application;

[0032] Figure 7 is a schematic diagram of the circuit structure of the electronic control system in another embodiment of this application;

[0033] Figure 8 is a schematic diagram showing the relative positions of the main control board, the power supply board, and the valve assembly in one embodiment of this application;

[0034] Figure 9 is a schematic diagram showing the relative positions of the main control board, the power supply board, and the valve assembly in another embodiment of this application;

[0035] Figure 10 is a schematic diagram of the distribution of modules on the main control board in one embodiment of this application;

[0036] Figure 11 is a schematic diagram of the distribution of modules on the main control board in another embodiment of this application;

[0037] Figure 12 is a schematic diagram of the module structure of the charging circuit in one embodiment of this application;

[0038] Figure 13 is a schematic diagram of the module structure of the boost circuit in one embodiment of this application;

[0039] Figure 14 is a schematic diagram of the module structure of the discharge circuit in one embodiment of this application;

[0040] Figure 15 is a schematic diagram of the module structure of the power display circuit in one embodiment of this application;

[0041] Figure 16 is a circuit diagram of a power display circuit in one embodiment of this application.

[0042] Explanation of reference numerals in the attached diagram: 1. HVAC system; 10. Electrical control system; 11. Control circuit; 12. Valve drive circuit; 13. Rectifier circuit; 131. Primary circuit; 132. Secondary circuit; 14. Backup power circuit; 141. Charging circuit; 1411. General-purpose step-down controller; 1415. Sampling module; 1416. Amplification module; 1417. Step-down feedback module; 142. Energy storage module; C1. Supercapacitor; 143. Boost circuit; 1431. Boost controller; 1432. Boost control module; 1433. Boost enable module; 1434. Boost feedback module; 1435. Output voltage adjustment module; 15. Discharge circuit; 17. Filter circuit; 19. Power display circuit; 191. Sub-display circuit; 192. First sub-display circuit; 1921. First light-emitting diode; 1922. Switching circuit ; 1923, Voltage divider circuit; 193, Second sub-display circuit; 1931, Second light-emitting diode; 194, First busbar; 195, Second busbar; 196, Busbar current-limiting resistor; 101, Main control board; 101a, Interface; 102, Power supply board; 103, High-voltage input terminal; 104, Low-voltage connection terminal; 20, Outdoor unit; 21, Compressor; 22, Four-way switching valve; 23, Liquid receiver; 24, Outdoor heat exchanger; 25, First expansion valve; 30, Refrigerant circuit; 31, Valve assembly; 311, Liquid valve; 312, Gas valve; 40, Indoor unit; 41, Indoor heat exchanger; 42, Second expansion valve; 50, Flow path switching module. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0044] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0045] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] Please refer to Figure 1. This application embodiment provides a heating, ventilation, and air conditioning (HVAC) system 1, which includes, but is not limited to, air conditioning, multi-split systems, heat pump systems, and central air conditioning. This HVAC system 1 can be applied to large-scale locations such as shopping malls and office buildings. The HVAC system 1 includes an electrical control system 10 (see Figure 4), an outdoor unit 20, a refrigerant circuit 30, and an indoor unit 40. The outdoor unit 20 can be connected to the indoor unit 40 via the refrigerant circuit 30.

[0048] The outdoor unit 20 includes a compressor 21, a four-way switching valve 22, a liquid receiver 23, an outdoor heat exchanger 24, and a first expansion valve 25. A valve assembly 31 is provided on the refrigerant circuit 30, which may include a liquid valve 311 and a gas valve 312. The valve assembly 31 may be a high-pressure valve, a low-pressure valve, or a liquid valve. The indoor unit 40 includes an indoor heat exchanger 41 and a second expansion valve 42. The outdoor unit 20 and the indoor unit 40 can be connected via the refrigerant circuit 30.

[0049] When the HVAC system 1 is operating in cooling mode, the four-way switching valve 22 switches to cooling mode. At this time, terminal A of the four-way switching valve 22 is connected to terminal B, and terminal C is connected to terminal D. It can be understood that during cooling, refrigerant flows from the compressor 21, passes through terminal A and terminal B of the four-way switching valve 22, and enters the outdoor heat exchanger 24. After condensation in the outdoor heat exchanger 24, the refrigerant passes through the first expansion valve 25... Liquid valve 311 and second expansion valve 42 enter the indoor heat exchanger 41 to cool the indoor air. Then, refrigerant flows from the indoor heat exchanger 41 through gas valve 312, the D end of the four-way switching valve 22 and the C end of the four-way switching valve 22 to the liquid storage tank 23. The refrigerant in the liquid storage tank 23 enters the compressor 21 for compression to carry out the next refrigeration cycle. At this time, the outdoor heat exchanger 24 acts as a condenser and the indoor heat exchanger 41 acts as an evaporator.

[0050] When the HVAC system 1 is operating in heating mode, the four-way switching valve 22 switches to heating mode. At this time, terminal A of the four-way switching valve 22 is connected to terminal D, and terminal B of the four-way switching valve 22 is connected to terminal C. It can be understood that during heating, refrigerant flows from the compressor 21, passes through terminal A and terminal D of the four-way switching valve 22, and enters the indoor heat exchanger 41 via the gas valve 312. The refrigerant can then transfer heat through the indoor heat exchanger 41. The refrigerant is released into the room to raise the indoor temperature. Then, the refrigerant flows into the liquid receiver 23 through the second expansion valve 42, the liquid valve 311, the first expansion valve 25, the outdoor heat exchanger 24, the B end of the four-way switching valve 22, and the C end of the four-way switching valve 22. The refrigerant flowing into the liquid receiver 23 then enters the compressor 21 for compression to enter the next heating cycle. At this time, the outdoor heat exchanger 24 acts as an evaporator, and the indoor heat exchanger 41 acts as a condenser.

[0051] Referring to Figure 2, further, in some embodiments, when the HVAC system 1 is a simultaneous heating and cooling HVAC system, the outdoor unit 20 is connected to multiple flow path switching modules 50 via high-pressure gas pipes, low-pressure gas pipes, and high-pressure liquid pipes. Each flow path switching module 50 contains a valve assembly 31, which includes a high-pressure gas valve, a low-pressure gas valve, and a liquid valve 312. One flow path switching module 50 corresponds to one indoor unit 40. For example, as shown in Figure 2, four flow path switching modules 50 correspond to four indoor units 40. Multiple flow path switching modules 50 and multiple indoor units 40 constitute a shared... The refrigerant circuit 30 of the outdoor unit 20 can be understood to allow some indoor units 40 to be in cooling mode and others in a cooling state by controlling the flow path switching module 50. That is, the electronic control system 10 can control the opening or closing of the high-pressure gas valve and the low-pressure gas valve to switch the refrigerant flow direction, thereby controlling the operating state of the indoor units 40. Multiple indoor units 40 can have different operating states; for example, at the same time, some indoor units 40 may be in cooling mode, others in heating mode, and the remaining indoor units 40 may be in a powered-off state. It should be noted that the embodiments of this application do not specifically limit the number of indoor units 40.

[0052] A second aspect of this application provides an electrical control system 11 for a heating, ventilation, and air conditioning (HVAC) system. Referring to Figures 1 and 3, in some embodiments, the electrical control system 10 may include a control circuit 11, a valve drive circuit 12, a rectifier circuit 13, a backup power supply circuit 14, and a discharge circuit 15. The valve drive circuit 12 is connected to a valve assembly 31 to drive the valve assembly 31. The control circuit 11 is electrically connected to the valve drive circuit 12 to control the valve drive circuit 12, and through the valve drive circuit 12, it can drive the valve assembly 31 to operate, thereby placing the corresponding indoor unit 40 in the corresponding operating state. The rectifier circuit 13 is connected to the valve drive circuit 12 and the control circuit 11. When the rectifier circuit 13 is not powered off, it can rectify AC power into DC power and supply power to the valve drive circuit 12 and the control circuit 11, allowing the HVAC system 1 to operate normally. At this time, the backup power supply circuit 14 does not need to supply power, thus having a longer lifespan.

[0053] Please refer to Figure 3. The backup power circuit 14 includes a charging circuit 141, an energy storage module 142, and a boost circuit 143 connected in sequence. The control circuit 11 can be connected to the charging circuit 141 and the boost circuit 143. One end of the charging circuit 141 is connected to the rectifier circuit 13, and the other end of the charging circuit 141 is connected to the energy storage module 142. The boost circuit 143 is connected to the valve drive circuit 12. When the rectifier circuit 13 is not powered off, the charging circuit 141 can draw power from the rectifier circuit 13 to supply power to the energy storage module 142. At this time, the energy storage module 142 can store electrical energy. When the energy storage module 142 has finished storing electrical energy, the charging circuit 141 stops supplying power to the energy storage module 142.

[0054] When the rectifier circuit 13 is de-energized, the charging circuit 141 does not work. At this time, the boost circuit 143 works. The boost circuit 143 can boost the positive voltage of the energy storage module 142 to supply power to the control circuit 11 and the valve drive circuit 12.

[0055] When the rectifier circuit 13 loses power, in order to ensure that the HVAC system can work normally, it is usually powered by the backup power circuit 14 to close the valve assembly 31, thereby preventing refrigerant leakage in the refrigerant circuit 30. Especially when the refrigerant is flammable, the valve assembly 31 needs to be closed in time to avoid explosion caused by flammable refrigerant leakage.

[0056] As shown in Figure 4, in some embodiments, the output of the rectifier circuit 13 is divided into two paths. One output of the rectifier circuit 13 is connected to the valve drive circuit 12 and the control circuit 11. This output is configured to rectify the AC power into DC power and supply power to the valve drive circuit 12 and the control circuit 11 when the power is not interrupted. The other output of the rectifier circuit 13 is connected to the charging circuit 141 to charge and store energy in the energy storage module 142. The boost circuit 143 is connected to the valve drive circuit 12 and is configured to supply power to the valve drive circuit 12 and the control circuit 11 when the rectifier circuit 13 is interrupted. Since the electronic control system 10 only requires a single rectifier circuit 13, it occupies less space and has a lower cost.

[0057] In some embodiments, there are two rectifier circuits 13. One rectifier circuit 13 is connected to the valve drive circuit 12 and the control circuit 11, and is configured to rectify AC power into DC power and supply power to the valve drive circuit 12 and the control circuit 11 when there is no power outage. The other rectifier circuit 13 is connected to the charging circuit 141 to charge and store energy in the energy storage module 142.

[0058] In related technologies, backup power supplies lack self-testing functions. When a backup power supply fails, the main control system cannot detect it. Often, the failure is only discovered when the backup power supply is actually needed, resulting in economic losses.

[0059] As shown in Figure 4, in some embodiments, when the HVAC system 1 is in a closed state and the rectifier circuit 13 is not de-energized, the control circuit 11 controls the rectifier circuit 13 and the charging circuit 141 to shut down, controls the boost circuit 143 to operate, and controls the valve drive circuit 12 to perform a valve closing operation to perform a self-test on the backup power circuit 14. If the valve closing is successful, it indicates that the backup power circuit 14 is normal; if the valve closing is unsuccessful, it indicates that the backup power circuit 14 has malfunctioned. This embodiment can verify whether the backup power supply is normal.

[0060] In some embodiments, when performing a self-test on the backup power circuit 14, the control circuit 11 is configured to acquire the operating time of the valve drive circuit 12 driving the valve assembly 31, and compare the operating time of the valve drive circuit 12 driving the valve assembly 31 with a first preset duration, the first preset duration being the time required for the valve assembly 31 to be completely closed.

[0061] If the valve drive circuit 12 drives the valve assembly 31 for a period of time that reaches the first preset duration, the backup power circuit 14 is determined to be normal; if the valve drive circuit 12 drives the valve assembly 31 for a period of time that does not reach the first preset duration, the backup power circuit 14 is determined to be abnormal.

[0062] The operating time of the monitoring valve drive circuit 12 is related to the number of steps in the valve assembly 31. The longer the operating time of the monitoring valve drive circuit 12, the more steps are required in the valve assembly 31. By monitoring the operating time of the monitoring valve drive circuit 12, it is possible to calculate whether the valve assembly 31 is fully closed.

[0063] In some embodiments, the valve assembly 31 includes multiple electronic valves, and the valve drive circuit 12 is connected to the multiple electronic valves. When the valve drive circuit 12 performs a valve closing operation, it sequentially closes each electronic valve. If multiple electronic valves are driven to operate simultaneously, the current will be large for a short period of time, which may cause insufficient power supply to the energy storage module 142, resulting in the interruption of multiple valve closure. However, by sequentially driving the multiple electronic valves to close, the power supply pressure on the energy storage module 142 is smaller, which can increase the probability that multiple valves are completely closed.

[0064] In some embodiments, when performing a self-test on the backup power circuit 14, the control circuit 11 is configured to acquire the operating time of the valve drive circuit 12 driving each electronic valve, and compare the operating time of the valve drive circuit 12 driving each electronic valve with a second preset duration, the second preset duration being the time required for a single electronic valve to be completely closed.

[0065] If the valve drive circuit 12 drives each electronic valve for a duration that reaches the second preset time, the energy storage module 142 is considered to be functioning normally; if the valve drive circuit 12 drives any one of the electronic valves for a duration that does not reach the second preset time, the energy storage module 142 is considered to be malfunctioning. By determining whether each electronic valve is closed, the state of the valve assembly 31 can be determined more accurately.

[0066] In some embodiments, the electronic control system 10 further includes a flow sensor disposed on the refrigerant circuit 30 and configured to detect the flow rate of the refrigerant circuit 30.

[0067] During the self-test of the backup power circuit 14, the control circuit 11 is configured to acquire the flow signal detected by the flow sensor and compare the flow value corresponding to the flow signal with a first preset flow value, which is the flow rate in the refrigerant circuit 30 when the valve assembly 31 is fully closed. If the flow value corresponding to the flow signal is lower than the first preset flow value, the backup power circuit 14 is determined to be normal; if the flow value corresponding to the flow signal is higher than the first preset flow value, the backup power circuit 14 is determined to be abnormal.

[0068] Understandably, a more accurate conclusion can also be drawn by comprehensively considering the operating time of the valve drive circuit 12 and the flow rate of the refrigerant circuit 30.

[0069] In some embodiments, the electronic control system 10 further includes a prompting module connected to the control circuit 11. The prompting module is configured to issue a prompt message when the backup power circuit 14 malfunctions, so that the user can be notified in a timely manner and eliminate potential hazards. The prompting module may, exemplarily, be a light-emitting module, a sound module, a display module, a vibration module, etc.

[0070] In some embodiments, the control circuit 11 is configured to perform a self-test every third preset time interval, that is, the control circuit 11 performs a power-off self-test periodically. Optionally, the third preset time interval can be set by the user to meet different needs. For example, the third preset time interval is 2 months.

[0071] In some embodiments, the control circuit 11 is configured to, after the backup power circuit 14 completes a self-test, control the rectifier circuit 13 and the charging circuit 141 to start, and control the boost circuit 143 to shut down, in order to charge the energy storage module 142. Charging the energy storage module 142 after the self-test is completed ensures that the energy storage module 142 can provide power during the next power outage.

[0072] In some embodiments, the control circuit 11 is configured to activate the valve drive circuit 12 after a fourth preset time interval following a self-test of the backup power circuit 14. The fourth preset time interval is the time required for the energy storage module 142 to be fully charged after discharging. After the energy storage module 142 has undergone one discharge, the current required for charging is relatively large. At this time, the rectifier circuit 13 can temporarily not supply power to the valve assembly 31, thereby reducing the requirements on the rectifier circuit 13 and saving costs.

[0073] In some embodiments, the electronic control system 10 further includes a leak detection sensor connected to the control circuit 11. The control circuit 11 is configured to send a command to the valve drive circuit 12 to close the control valve assembly 31 when the leak detection sensor detects a refrigerant leak in the refrigerant circuit 30, thereby reducing refrigerant leakage and improving safety performance.

[0074] In some embodiments, the refrigerant circuit 30 includes a high-pressure gas pipe, a low-pressure gas pipe, and a liquid pipe. The valve assembly 31 includes a high-pressure gas valve disposed on the high-pressure gas pipe, a low-pressure gas valve disposed on the low-pressure gas pipe, and a liquid valve disposed on the liquid pipe. The electrical capacity of the energy storage module 142 can drive the valve assembly 31 to switch from a fully open state to a fully closed state.

[0075] In some embodiments, one output of the rectifier circuit 13 is connected to at least two valve drive circuits 12, and the rectifier circuit 13 can simultaneously supply power to at least two valve drive circuits 12. When no rectifier circuit 13 is damaged, each rectifier circuit 13 supplies power to one valve drive circuit 12. When one rectifier circuit 13 is damaged, the corresponding valve drive circuit 12 can be reconnected to a nearby undamaged rectifier circuit 13, which then drives both valve drive circuits 12. In this embodiment, when a rectifier circuit 13 is damaged, it can be quickly repaired simply by changing the wiring, providing good backup performance.

[0076] As shown in Figures 5-7, in some embodiments, the valve drive circuit 12, rectifier circuit 13, control circuit 11, and backup power supply are disposed on the same circuit board, thereby achieving a high degree of integration, saving space, and reducing the size of the electronic control system 10. The valve drive circuit 12, rectifier circuit 13, control circuit 11, and backup power supply are connected through a copper layer on the circuit board, which saves costs compared to connecting them through wires.

[0077] Alternatively, the valve drive circuit 12, rectifier circuit 13, control circuit 11, and backup power supply can be located on at least two different circuit boards. In this way, only one circuit board has the rectifier circuit 13, meaning only one circuit board has a dangerous voltage, while the other circuit boards do not, thereby improving the safety of the electronic control system 10. Furthermore, during maintenance and replacement, only the faulty circuit board can be replaced, rather than replacing all circuit boards, thus reducing maintenance costs.

[0078] As shown in Figures 5-7, in some embodiments, the electronic control system 10 further includes a main control board 101 and a power supply board 102. The power supply board 102 and the main control board 101 are spaced apart. The control circuit 11 and the valve drive circuit 12 are disposed on the main control board 101, and the backup power supply circuit 14 is disposed on the power supply board 102.

[0079] The rectifier circuit 13 is disposed on the main control board 101 or the power supply board 102, so that the voltage of one of the main control board 101 or the power supply board 102 is a safe voltage, thereby improving the safety of the electronic control system 10.

[0080] As shown in Figure 5, in some embodiments, the rectifier circuit 13 is disposed on the power supply board 102, and the main control board 101 has a reserved interface 101a for connecting the rectifier circuit 13. As shown in Figure 6, when the rectifier circuit 13 is disposed on the power supply board 102, the main control board 101 does not need to be disposed on the rectifier circuit 13, thus making the main control board 101 safer. As shown in Figure 7, when the HVAC system 1 does not require valve shut-off upon power failure, the power supply board 102 does not need to be disposed, and the rectifier circuit 13 on the power supply board 102 is installed on the main control board 101. The HVAC system 1 can then only be disposed on the main control board 101, thereby saving costs and reducing size.

[0081] In some embodiments, as shown in FIG8, the power supply board 102 is placed between the main control board 101 and the valve assembly 31. When maintenance personnel open the electrical control box cover, they first see the main control board 101, with the power supply board 102 behind it. The dashed lines represent safe voltage lines, and the solid lines represent dangerous voltage lines. Alternatively, as shown in FIG9, the main control board 101 and the power supply board 102 are placed on the same plane, with the main control board 101 on the left and the power supply board 102 on the right. In this embodiment, the dangerous live lines are below, and the safe lines are above, achieving separation of safe and dangerous electricity. It can be seen that the dangerous voltage lines and safe voltage lines are arranged separately, resulting in high safety. The same surface of the power supply board 102 includes a high-voltage mounting area and a low-voltage mounting area. The rectifier circuit 13 includes a primary circuit 131 and a secondary circuit 132 that are coupled to each other. At least the primary circuit 131 is installed in the high-voltage mounting area, and the charging circuit 141, the energy storage module 142, and the boost circuit 143 are installed in the low-voltage mounting area.

[0082] The electrical control system 10 also includes a high-voltage input terminal 103, a low-voltage connection terminal 104, and a filter circuit 17. The high-voltage input terminal 103 is located in the high-voltage mounting area and is connected to the primary circuit 131. The high-voltage input terminal 103 is configured to connect to an external AC cable. The low-voltage connection terminal 104 is located in the low-voltage mounting area and is connected to the secondary circuit 132 of the rectifier circuit 13 and the boost circuit 143, as well as the control circuit 11 and the valve drive circuit 12, through the low-voltage connection terminal 104. The filter circuit 17 is located in the high-voltage mounting area and is connected between the primary circuit 131 and the high-voltage input terminal 103. The filter circuit 17 is configured to filter the AC power input to the high-voltage input terminal 103.

[0083] For example, circuits carrying dangerous voltages, such as the high-voltage input terminal 103, filter circuit 17, and primary circuit 131, are arranged at the bottom, while the secondary circuit 132, charging circuit 141, energy storage module 142, and boost circuit 143 are arranged at the top. This circuit layout ensures that dangerous electrical connections are located at the bottom of the power board, while safe electrical connections are located at the top, achieving separation between dangerous and safe electrical circuits and enhancing safety.

[0084] As shown in Figures 10 and 11, in some embodiments, the rectifier circuit 13 is disposed on the power supply substrate 102, which is vertically mounted. The projection of the energy storage module 142 along the height direction is spaced apart from the projection of the rectifier module along the height direction. The energy storage module 142 is typically a supercapacitor C1. The supercapacitor C1 is greatly affected by temperature, and its lifespan is shorter at higher temperatures. The rectifier circuit 13 generates relatively large amounts of heat during operation, which can heat the surrounding air, causing the hot air to rise naturally. If the energy storage module 142 is disposed above or close to the rectifier circuit 13, it will have an adverse effect on the energy storage module 142. In this embodiment, the projection of the energy storage module 142 along the height direction is spaced apart from the projection of the rectifier module along the height direction, allowing the energy storage module 142 to be further away from the rectifier module, thereby minimizing the temperature of the energy storage module 142 and extending its lifespan.

[0085] As shown in Figures 10 and 11, in some embodiments, the energy storage module 142 and the rectifier module can be arranged diagonally or maintain a certain horizontal distance. For example, the energy storage module 142 and the rectifier module are spaced apart along the left-right direction of the HVAC system 1, thereby minimizing the negative impact of the rectifier module on the energy storage module 142. Alternatively, the energy storage module 142 and the rectifier module at least partially overlap along the left-right direction of the HVAC system 1, and the distance between the energy storage module 142 and the rectifier module in the left-right direction is greater than or equal to 6 mm, thereby minimizing the negative impact of the rectifier module on the energy storage module 142.

[0086] As shown in Figures 10 and 11, in some embodiments, the filter circuit 17 is arranged adjacent to the energy storage module 142. The energy storage module 142 is a supercapacitor C1 or a battery, so it basically does not generate electromagnetic interference, that is, its impact on the filter circuit 17 is relatively small. This arrangement makes the filtering effect of the filter circuit 17 better.

[0087] In some embodiments, the electronic control system 10 further includes a power failure detection circuit. The power failure detection circuit is disposed on the main control board 101 and connected to the input or output terminal of the control circuit 11 and the rectifier circuit 13. The power failure detection circuit is configured to detect whether the rectifier circuit 13 is de-energized. The control circuit 11 is configured to issue a command to close the control valve assembly 31 when the power failure detection circuit detects that the rectifier circuit 13 is de-energized.

[0088] As shown in Figures 10 and 11, in some embodiments, the low-voltage connection terminal 104 is located at the edge of the power supply board 102, making it less likely to be blocked by other devices during insertion and removal. Optionally, the low-voltage connection terminal 104 is arranged adjacent to the boost circuit 143. Since the boost circuit 143 is connected to the low-voltage connection terminal 104, this arrangement facilitates wiring between the boost circuit 143 and the low-voltage connection terminal 104. Optionally, the high-voltage input terminal 103 is located at the edge of the power supply board 102, making it less likely to be blocked by other devices during insertion and removal.

[0089] As shown in Figures 10 and 11, in some embodiments, at least one of the charging circuit 141 and the boost circuit 143 is disposed adjacent to the rectifier module. The components of the charging circuit 141 and the boost circuit 143 are mainly ceramic capacitors, carbon film resistors, inductors, and semiconductors, which have strong high-temperature resistance; therefore, placing them near the rectifier circuit 13 does not affect its normal operation. Optionally, at least one of the charging circuit 141 and the boost circuit 143 is disposed above the rectifier module. Optionally, at least one of the charging circuit 141 and the boost circuit 143 is disposed to the side of the rectifier module.

[0090] As shown in Figures 8 and 10, in some embodiments, the power supply board 102 and the main control board 101 are stacked and spaced apart from each other along the horizontal direction of the HVAC system 1, which includes the left-right direction or the front-back direction of the HVAC system 1.

[0091] In the high-voltage installation area, along the horizontal direction, the filter circuit 17 is located between the rectifier circuit 13 and the high-voltage input terminal 103, thus facilitating wiring. In the low-voltage installation area, along the horizontal direction, the entire assembly consisting of the charging circuit 141 and the boost circuit 143 is located between the low-voltage connection terminal 104 and the energy storage module 142, thus facilitating wiring.

[0092] Optionally, the low-voltage installation area is located above the high-voltage installation area, the entire assembly of the charging circuit 141 and the boost circuit 143 and the low-voltage connection terminal 104 are located above the rectifier module, and the energy storage module 142 is located above the entire assembly of the filter circuit 17 and the high-voltage input terminal 103.

[0093] As shown in Figures 10 and 11, in some embodiments, the high-voltage input terminal 103 includes an AC input terminal, a main control connection terminal, and a cascade terminal, and the electrical control system 10 also includes an AC input cable, a main control connection cable, and a cascade cable.

[0094] An AC input cable connects to an AC input terminal, thereby supplying power to the AC input terminal. A main control connection cable connects to the main control connection terminal and the main control board 101, thereby supplying power to the main control board 101. A cascade cable connects to a cascade terminal and the AC input terminal of another power supply board 102, thereby supplying power to the other power supply boards 102.

[0095] Optionally, the high-voltage input terminal 103 is arranged at the lower right of the power supply board 102 to facilitate cascading with other power supply boards 102.

[0096] As shown in Figure 10, in some embodiments, the AC input cable includes a first segment and a second segment connected to the first segment. The first segment and the second segment are set at an angle. The first segment is connected to the AC input terminal. The second segment is set on the side of the high-voltage installation area away from the low-voltage installation area and along the vertical direction. The distance between the second segment and the substrate is greater than 10mm, so as to leave a prohibited wiring area between the AC input cable and the filter circuit 17, thereby preventing electromagnetic interference from being transmitted to the AC input cable through spatial radiation.

[0097] As shown in Figures 9 and 11, in some embodiments, the power supply board 102 and the main control board 101 are not stacked or are coplanar along the horizontal direction of the HVAC system 1, which includes the left-right direction or the front-back direction of the HVAC system 1.

[0098] Within the high-voltage installation area, the high-voltage input terminal 103 and the filter circuit 17 are arranged horizontally in sequence for easy wiring. The high-voltage input terminal 103 is located on the side of the filter circuit 17 closest to the main control board 101, facilitating power supply to the main control board 101. The filter circuit 17 is positioned vertically below the primary coil of the rectifier circuit 13 for easy wiring.

[0099] Within the low-voltage installation area, horizontally, the charging circuit 141 and the boost circuit 143 are positioned between the low-voltage connection terminal 104 and the secondary circuit 132 of the rectifier module, facilitating wiring. The energy storage module 142 and the primary circuit 131 are arranged horizontally at intervals. Vertically, the energy storage module 142 is located between the low-voltage connection terminal 104, the charging circuit 141, and the boost circuit 143, and the high-voltage input terminal 103. The primary circuit 131 is located between the secondary circuit 132 and the filter circuit 17.

[0100] In some embodiments, as shown in FIG12, the charging circuit 141 may include a universal buck controller 1411, a sampling module 1415, an amplification module 1416, and a buck feedback module 1417. The input terminal of the universal buck controller 1411 is connected to one output of the rectifier circuit 13. At this time, one output of the rectifier circuit 13 can be represented as a DC power supply I, that is, the input terminal of the universal buck controller 1411 is connected to the positive terminal of the DC power supply I. The first terminal of the sampling module 1415 is connected to the output terminal of the universal buck controller 1411, the second terminal of the sampling module 1415 is connected to the positive terminal of the energy storage module 142, the first input terminal of the amplification module 1416 is connected to the first terminal of the sampling module 1415, the second input terminal of the amplification module 1416 is connected to the second terminal of the sampling module 1415, the input terminal of the buck feedback module 1417 is connected to the output terminal of the amplification module 1416, the controlled terminal of the buck feedback module 1417 is connected to the second terminal of the sampling module 1415, and the output terminal of the buck feedback module 1417 is connected to the feedback terminal of the universal buck controller 1411.

[0101] In this example, the sampling module 1415 is connected in series between the positive terminal of the output of the charging circuit 141 and the positive terminal of the energy storage module 142. When the charging circuit 141 outputs the charging current Ic, the charging current Ic will generate a voltage drop through the sampling module 1415. The amplification module 1416 amplifies the voltage on the sampling module 1415 to obtain the amplified voltage Vao. It is worth noting that the amplified voltage Vao at this time is based on the positive terminal of the energy storage module 142 as the zero reference voltage.

[0102] The energy storage module 142 in this application can be a supercapacitor C1. Below, using the supercapacitor C1 as an example, an exemplary description of the electrical control system 1 and the HVAC system provided in this application will be provided. It is worth noting that the energy storage module 142 can also be other energy storage elements; this application does not impose specific limitations on this.

[0103] In some embodiments, as shown in FIG13, the boost circuit 143 includes a boost control module, a boost enable module 1433, a boost feedback module 1434, and an output voltage adjustment module 1435. The boost control module includes the aforementioned boost controller 1431, the output terminal of which is connected to the positive terminal of the energy storage module 142. The first terminal of the boost enable module 1434 is connected to the output terminal of the boost controller 1431, and the second terminal of the boost enable module 1434 is connected to the enable terminal of the boost controller 1431. The first terminal of the boost feedback module 1434 is connected to the boost controller 1435. The output terminal of circuit 11 is connected to the control circuit 11. The second terminal of the boost feedback module 1434 is connected to the feedback terminal of the boost controller 1431. The first terminal of the output voltage adjustment module 1435 is connected to the first terminal of the boost feedback module 1434. The second terminal of the output voltage adjustment module 1435 is connected to the output terminal (I / O port as shown in Figure 4). The third terminal of the output voltage adjustment module 1435 is connected to the second terminal of the boost feedback module 1434. The third terminal of the boost enable module 1434, the boost feedback module 1434, and the third terminal of the output voltage adjustment module 1435 are all grounded. The output voltage adjustment module 1435 is configured to adjust the voltage fed back from the boost feedback module 1434 to the feedback terminal of the boost controller 1431.

[0104] In this example, the enable signal EN required by the enable terminal of the boost controller 1431 is provided by the boost enable module 1433 and is not controlled by the control circuit 11. Therefore, even if there is a program error in the control circuit 11, it will not affect the normal operation of the boost controller 1431, ensuring the reliability and stability of the boost circuit 143. Furthermore, by setting the output voltage adjustment module 1435, the output voltage of the boost circuit 143 can be adjusted according to different needs. For example, when the boost circuit 143 needs to provide energy, its output voltage is kept at a high level to ensure the reliability of its power supply. When the boost circuit 143 does not need to provide energy, the voltage fed back to the feedback terminal of the boost controller 1431 by the boost feedback module 1434 is adjusted to keep the output voltage of the boost circuit 143 at a low level, avoiding energy loss and providing high flexibility.

[0105] In related technologies, since the energy storage module 142 needs to be inspected periodically, it is necessary to connect the energy storage module 142 to the discharge circuit 15 so that the discharge circuit 15 can release the electrical energy stored in the energy storage module 142, thereby improving safety during maintenance. However, in the scheme shown in Figure 4, the discharge circuit 15 is directly connected in parallel with the energy storage module 142 to directly discharge the energy storage module 142. During the discharge process of the discharge circuit 15 on the energy storage module 142, as the discharge circuit 15 continues to discharge the energy storage module 142, the output voltage of the energy storage module 142 will continuously decrease, causing the discharge power of the discharge circuit 15 to continuously decrease as well, resulting in a longer discharge time for the discharge circuit 15 on the energy storage module 142.

[0106] To solve the above problems, please refer to Figure 14. In some embodiments of this application, the discharge circuit 15 is connected in parallel to the output terminal of the boost circuit 143, and the discharge circuit 15 is connected to the output voltage obtained after the boost circuit 143 boosts the positive voltage of the energy storage module 142, so as to perform boost discharge on the energy storage module 142. It can be understood that the positive voltage of the energy storage module 142 can obtain an output voltage after being boosted by the boost circuit 143. For example, the output voltage can be 12V, that is, the output voltage obtained after the positive voltage of the energy storage module 142 is boosted by the boost circuit 143 is 12V. When the discharge circuit 15 needs to discharge the energy storage module 142, the discharge circuit 15 can be connected to the same output voltage and discharge. At this time, the voltage across the discharge circuit 15 can be the same output voltage, that is, the voltage across the discharge circuit 15 is 12V, so that the discharge power of the discharge circuit 15 will not continue to decrease, thus accelerating the discharge efficiency of the discharge circuit 15 on the energy storage module 142.

[0107] For example, when the positive voltage of the energy storage module 142 is greater than or equal to 1V, the boost circuit 143 can increase the positive voltage of the energy storage module 142 to obtain a preset output voltage. For example, the preset output voltage can be 12V. The discharge circuit 15 is connected to the output voltage and discharges to accelerate the discharge efficiency of the discharge circuit 15 on the energy storage module 142.

[0108] In related technologies, the HVAC system 1 does not have the function of displaying the backup power supply level, making it impossible for maintenance personnel to determine the energy storage status of the backup power supply by observation, which is inconvenient for troubleshooting. In some embodiments, the electrical control system 10 also includes a power display circuit 19, which is connected to the energy storage module 142 and is configured to display the current power level of the energy storage module 142, thereby helping maintenance personnel to determine whether the energy storage module 142 has power and how much power it has.

[0109] As shown in Figures 15-16, in some embodiments, the power display circuit 19 includes multiple sub-display circuits 191 connected in parallel, and the multiple sub-display circuits 191 are selectively lit by the positive voltage of different energy storage modules 142.

[0110] In some embodiments, the plurality of sub-display circuits 191 include a plurality of first sub-display circuits 192, each first sub-display circuit 192 including a first light-emitting diode 1921, a switching circuit 1922 and a voltage divider circuit 1923.

[0111] The positive terminal of the first light-emitting diode 1921 is connected to the positive terminal of the energy storage module 142, and the negative terminal of the energy storage module 142 is grounded. The input terminal of the switching circuit 1922 is connected to the negative terminal of the first light-emitting diode 1921, and the output terminal of the switching circuit 1922 is grounded. As shown in Figure 16, LED52, LED53, LED54, LED55, and LED56 are all first light-emitting diodes 1921, and IC52, IC53, IC54, IC55, and IC56 are all switching circuits 1922.

[0112] One end of the voltage divider circuit 1923 is connected to the positive terminal of the energy storage module 142, and the other end is grounded. The voltage divider circuit 1923 has a voltage sampling node connected to the energy storage module 142. The voltage divider circuits 1923 of different first sub-display circuits 1923 have different voltage division ratios for the same positive terminal voltage of the energy storage module 142.

[0113] Multiple first sub-display circuits 192 are configured such that when the energy storage module 142 has different positive terminal voltages, a switching circuit 1922 is driven to conduct by a voltage divider circuit 1923 connected to it, thereby controlling a first light-emitting diode 1921 to emit light. In some embodiments, the switching circuit 1922 includes at least one of a controllable precision voltage regulator, a transistor, and a MOSFET.

[0114] In some embodiments, the voltage divider circuit 1923 includes a first voltage divider resistor and a second voltage divider resistor. The first terminal of the first voltage divider resistor is connected to the positive terminal of the energy storage module 142, and the first terminal and the second terminal of the second voltage divider resistor are connected to a voltage sampling node. The second terminal of the second voltage divider resistor is grounded. As shown in FIG16, resistors R503 and R504 form voltage divider circuit 1923, resistors R506 and R507 form voltage divider circuit 1923, resistors R510 and R511 form voltage divider circuit 1923, resistors R513 and R514 form voltage divider circuit 1923, and resistors R515 and R516 form voltage divider circuit 1923. By adjusting the resistance values ​​of resistors R503 and R504, the voltage value at pin 1 of IC52 can be adjusted, thereby adjusting the voltage value of the energy storage module 142 when IC52 is turned on. For example, when the energy storage module 142 reaches 60% charge, LED54 is desired to light up. If the voltage of a fully charged supercapacitor C1 group is 7.2V, then the voltage corresponding to 60% charge is _____. IC54 is a general-purpose 2.5V voltage reference chip AZ431 (YL431). By configuring the resistor values ​​of R509 and R510, the voltage reaching the reference pin of IC54 after the 5.577V is divided by R509 and R510 is 2.5V. With this configuration, when the capacitor bank voltage rises from low to 5.577V, LED54 will light up. The configuration method for the LED circuit at other charge levels is the same as the configuration method for the 60% charge level.

[0115] In some embodiments, the first sub-display circuit 192 further includes a first current-limiting resistor, which is connected in series between the negative terminal of the first light-emitting diode 1921 and the input terminal of the switching circuit 1922. By setting the first current-limiting resistor, the current flowing through the first light-emitting diode 1921 can be reduced to ensure that the current does not exceed the withstand capability of the first light-emitting diode 1921. As shown in Figure 16, resistors R502, R505, R508, R511, and R514 are all first current-limiting resistors.

[0116] In some embodiments, the first sub-display circuit 192 further includes a first shunt resistor connected in parallel with the first light-emitting diode 1921. The function of the first shunt resistor is to bypass the leakage current generated by IC54, ensuring that LED54 does not dimly light up when the capacitor voltage is below 5.577V. As shown in Figure 16, resistors R532, R535, R538, R531, and R534 are all first current-limiting resistors.

[0117] As shown in Figures 15-16, in some embodiments, the plurality of sub-display circuits 191 further includes a second sub-display circuit 193. The second sub-display circuit 193 includes a second light-emitting diode 1931. The positive terminal of the second light-emitting diode 1931 is connected to the positive terminal of the energy storage module 142, and the negative terminal of the second light-emitting diode 1931 is grounded.

[0118] The second LED 1931 is configured to light up when the voltage of the energy storage module 142 is higher than a preset voltage value. Typically, the preset voltage value can be set relatively low; for example, the second LED 1931 can be lit when the charge level of the energy storage module 142 is higher than 3%. Therefore, the lighting of the second LED 1931 indicates that the energy storage module 142 is charged, and the extinguishing of the second LED 1931 indicates that the energy storage module 142 is not charged.

[0119] In some embodiments, the second sub-display circuit 193 further includes a second current-limiting resistor, which is connected in series between the negative terminal of the second light-emitting diode 1931 and ground. By setting the second current-limiting resistor, the current flowing through the second light-emitting diode 1931 can be reduced to ensure that the current does not exceed the withstand capability of the second light-emitting diode 1931. As shown in Figure 16, resistor R501 is the second current-limiting resistor.

[0120] In some embodiments, the power display circuit 19 further includes a first bus 194, a second bus 195, and a bus current-limiting resistor 196. The first bus 194 is connected to the positive terminal of the energy storage module 142. One end of the voltage divider circuit 1923 is connected to the first bus 194. The positive terminals of the first light-emitting diode 1921 and the second light-emitting diode 1931 are both connected to the second bus 195. The bus current-limiting resistor 196 is connected in series between the first bus 194 and the second bus 195. Resistor R500 is the bus current-limiting resistor 196, which ensures that the low power indicator light does not flow with excessive current.

[0121] In some embodiments, the power display circuit 19 includes a voltage sampling module 1415 and a display element. The voltage sampling module 1415 is connected to the positive terminal of the energy storage module 142 and the control circuit 11, and is configured to sample the positive terminal voltage of the energy storage module 142. The display element is connected to the control circuit 11, and the control circuit 11 controls the display element to perform corresponding display based on the sampled positive terminal voltage.

[0122] In some embodiments, the electronic control system 10 further includes a display switch circuit, which is connected in series between the power display circuit 19 and the positive terminal of the energy storage module 142. The display switch circuit is configured to control the power display circuit 19 to work or stop working.

[0123] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of the specification and drawings of this application under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An electrical control system for a heating, ventilation, and air conditioning (HVAC) system, wherein, The HVAC system includes a refrigerant circuit, and a valve assembly is installed in the refrigerant circuit. The electrical control system includes: A valve drive circuit, connected to the valve assembly, is configured to drive the valve assembly to operate. A control circuit, connected to the valve drive circuit, is configured to control the valve drive circuit. The rectifier circuit has two outputs. One output of the rectifier circuit is connected to the valve drive circuit and the control circuit. It is configured to rectify the AC power into DC power and supply power to the valve drive circuit and the control circuit when the power is not interrupted. The backup power circuit includes a charging circuit, an energy storage module, and a boost circuit connected in sequence. The control circuit is also connected to the charging circuit and the boost circuit. Another output of the rectifier circuit is connected to the charging circuit to charge and store energy for the energy storage module. The boost circuit is connected to the valve drive circuit and the control circuit and is configured to supply power to the valve drive circuit and the control circuit when the rectifier circuit is powered off.

2. The electronic control system according to claim 1, wherein, The valve drive circuit, the rectifier circuit, the control circuit, and the backup power supply are disposed on the same circuit board, or on at least two different circuit boards.

3. The electronic control system according to claim 1, wherein, The electronic control system further includes: a main control board, on which the control circuit and the valve drive circuit are disposed; A power supply board is disposed at an interval from the main control board, and the backup power supply circuit is disposed on the power supply board; The rectifier circuit is disposed on the main control board or the power supply board.

4. The electronic control system according to claim 3, wherein, The rectifier circuit is disposed on the power supply board, and the main control board has a reserved interface for connecting the rectifier circuit.

5. The electronic control system according to claim 3, wherein, The rectifier circuit is disposed on the power supply substrate, which is vertically mounted, and the projection of the energy storage module along the height direction is spaced apart from the projection of the rectifier module along the height direction.

6. The electronic control system according to claim 5, wherein, The same surface of the power supply substrate includes a high-voltage mounting area and a low-voltage mounting area. The rectifier circuit is mounted in the high-voltage mounting area, and the backup power supply circuit is mounted in the low-voltage mounting area.

7. The electronic control system according to claim 3, wherein, The electronic control system also includes: A power outage detection circuit is disposed on the main control board and connected to the input or output terminal of the control circuit and the rectifier circuit, and is configured to detect whether the rectifier circuit is powered off. The control circuit is configured to issue a command to close the valve assembly when the power failure detection circuit detects a power failure in the rectifier circuit.

8. The electronic control system according to claim 7, wherein, When the HVAC system is in a closed state and the rectifier circuit is not de-energized, the control circuit is also configured to control the rectifier circuit and the charging circuit to shut down, control the boost circuit to operate, and control the valve drive circuit to perform a valve closing operation, so as to perform a self-test on the backup power circuit.

9. The electronic control system according to claim 3, wherein, The electronic control system also includes: A leak detection sensor is connected to the control circuit, which is configured to issue a command to close the valve assembly when the leak detection sensor detects a refrigerant leak in the refrigerant circuit.

10. The electronic control system according to claim 3, wherein, The refrigerant circuit includes a high-pressure gas pipe, a low-pressure gas pipe, and a liquid pipe. The valve assembly includes a high-pressure gas valve on the high-pressure gas pipe, a low-pressure gas valve on the low-pressure gas pipe, and a liquid valve on the liquid pipe. The capacity of the energy storage module is sufficient to drive the valve assembly to switch from a fully open state to a fully closed state.

11. The electronic control system according to claim 3, wherein, One output of the rectifier circuit is connected to at least two of the valve drive circuits, and the rectifier circuit can simultaneously supply power to at least two of the valve drive circuits.

12. The electronic control system according to claim 3, wherein, The energy storage module includes a supercapacitor, and the charging circuit includes: A general-purpose step-down controller is connected to one output of the rectified current; The sampling module has its first end connected to the output terminal of the general-purpose step-down controller and its second end connected to the positive terminal of the energy storage module. The amplification module has its non-inverting input terminal connected to the first terminal of the sampling module and its inverting input terminal connected to the second terminal of the sampling module. The step-down feedback module has its input end connected to the output end of the amplification module, its controlled end connected to the second end of the sampling module, and its output end connected to the feedback end of the universal step-down controller.

13. The electronic control system according to claim 3, wherein, The boost circuit includes: A boost control module is connected to the positive terminal of the energy storage module; The boost enable module has one end connected to the output terminal of the boost control module and the other end connected to the enable terminal of the boost control module. The boost feedback module has one end connected to the output terminal of the boost control module and the other end connected to the feedback terminal of the boost control module. An output voltage adjustment module is connected to the control circuit and the boost feedback module, and is configured to adjust the voltage fed back to the feedback terminal by the boost feedback module.

14. The electronic control system according to claim 3, wherein, The electronic control system also includes: A discharge circuit is disposed on the power supply substrate and connected in parallel to the output terminal of the boost circuit. The discharge circuit is configured to discharge the energy storage module.

15. The electronic control system according to claim 3, wherein, The electronic control system also includes: A power display circuit is disposed on the power supply board and connected to the energy storage module, and is configured to display the current power of the energy storage module.

16. The electronic control system according to claim 15, wherein, The power display circuit includes multiple sub-display circuits connected in parallel, and each of the multiple sub-display circuits is selectively lit by a positive voltage of a different energy storage module.

17. The electronic control system according to claim 3, wherein, The electronic control system also includes: A filtering circuit is connected to the rectifier circuit and is configured to filter the AC power input to the rectifier circuit. The filtering circuit is disposed on the main control board or the power supply board where the rectifier circuit is located.

18. A heating, ventilation, and air conditioning system, wherein, include: Outdoor unit; The refrigerant circuit is connected to the outdoor unit; The indoor unit is connected to the outdoor unit via the refrigerant circuit. Valve assembly, disposed on the refrigerant circuit; and The electronic control system according to any one of claims 1-17, wherein the valve drive circuit is connected to the valve assembly.

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