Heating, ventilation, and air conditioning system and electric control system thereof

Abstract

Disclosed in embodiments of the present application are a heating, ventilation, and air conditioning system and an electric control system thereof. The heating, ventilation, and air conditioning system comprises a refrigerant loop; a valve assembly is provided on the refrigerant loop; the electric control system comprises a valve driving circuit, a control circuit, a rectifier circuit, and a backup power supply circuit; the valve driving circuit is connected to the valve assembly; the control circuit is connected to the valve driving circuit; the rectifier circuit is connected to the valve driving circuit and the control circuit, and is configured to rectify alternating current into direct current and supply power to the valve driving circuit and the control circuit in the absence of a power outage; and the backup power supply circuit is connected to the valve driving circuit, the control circuit and the rectifier circuit, and is configured to supply power to the valve driving circuit and the control circuit during a power outage of the rectifier circuit.

Description

HVAC system and its electric control system

[0001] The present application claims priority to the Chinese patent application No. 2024106765373, filed on May 28, 2024, entitled "HVAC system and its electric control system"; the Chinese patent application No. 2024106765424, filed on May 28, 2024, entitled "HVAC system and its electric control system"; and the Chinese patent application No. 2024106765513, filed on May 28, 2024, entitled "HVAC system and its electric control system", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of air conditioning, in particular to an HVAC system and its electric control system. BACKGROUND

[0003] In the related art, the air conditioning system is usually provided with a valve driving circuit, a control circuit, a rectifier circuit and a backup power supply circuit, wherein the backup power supply circuit is configured to supply power to the valve driving circuit and the control circuit when the rectifier circuit is powered off.

[0004] In some improved schemes, the control circuit usually sends an enable signal to the backup power supply circuit to make the backup power supply circuit work; however, when the control circuit program is wrong, the enable signal may be temporarily lost, so that the backup power supply circuit cannot supply power to the control circuit, resulting in the loss of power of the control circuit, low reliability and affecting the normal use of the control circuit. SUMMARY

[0005] The embodiments of the present application provide an HVAC system and its electric control system, the enable signal of the electric control system is not controlled by the control circuit, so that even if the control circuit has a program error problem, it will not affect the normal use of the backup power supply circuit, ensuring the working reliability and stability of the backup power supply circuit.

[0006] In a first aspect, the embodiments of the present application provide an electric control system of an HVAC system, the HVAC system comprising a refrigerant circuit, the refrigerant circuit being provided with a valve assembly, the electric control system comprising: a valve driving circuit, a control circuit, a rectifier circuit and a backup power supply circuit; the valve driving circuit is connected with the valve assembly and is configured to drive the valve assembly to act; the control circuit is connected with the valve driving circuit and is configured to control the valve driving circuit; the rectifier circuit is connected with the valve driving circuit and the control circuit and is configured to rectify alternating current into direct current and supply power to the valve driving circuit and the control circuit when not powered off; the backup power supply circuit is connected with the valve driving circuit, the control circuit and the rectifier circuit and is configured to supply power to the valve driving circuit and the control circuit when the rectifier circuit is powered off.

[0007] Based on the electric control system provided in the application, the backup power supply circuit comprises a charging circuit, an energy storage module and a voltage boosting circuit connected in sequence, the control circuit is further connected with the charging circuit and the voltage boosting circuit, the charging circuit is connected with the rectifier circuit and the energy storage module respectively, the voltage boosting circuit is connected with the valve driving circuit, and the valve driving circuit and the control circuit are powered when the rectifier circuit is powered off; wherein the voltage boosting circuit comprises a voltage boosting control module, a voltage boosting enable module, a voltage boosting feedback module and an output voltage adjustment module; the voltage boosting control module comprises a voltage boosting controller, and the output end is connected with the positive electrode of the energy storage module; the voltage boosting enable module is connected with the output end of the voltage boosting controller at the first end, connected with the enable end of the voltage boosting controller at the second end, and grounded at the third end; the voltage boosting feedback module is connected with the output end of the voltage boosting controller at the first end, connected with the feedback end of the voltage boosting controller at the second end, and grounded at the third end; the output voltage adjustment module is connected with the first end of the voltage boosting feedback module at the first end, connected with the output end of the control circuit at the second end, and connected with the second end of the voltage boosting feedback module at the third end, and the output voltage adjustment module is arranged to adjust the voltage fed back to the feedback end by the voltage boosting feedback module.

[0008] Based on the electric control system provided in the application, the enable signal required by the enable end of the voltage boosting controller is provided by the voltage boosting enable module, and is not controlled by the control circuit, so that even if there is a program error problem in the control circuit, the normal use of the voltage boosting controller will not be affected, and the working reliability and stability of the voltage boosting circuit are ensured. Moreover, by arranging the output voltage adjustment module, the output voltage of the voltage boosting circuit can be adjusted according to different requirements, for example, when the voltage boosting circuit needs to provide energy, the output voltage of the voltage boosting circuit is kept at a high level to ensure the power supply reliability of the voltage boosting circuit, and when the voltage boosting circuit does not need to provide energy, the voltage of the voltage boosting feedback module fed back to the feedback end of the voltage boosting controller is adjusted to keep the output voltage of the voltage boosting circuit at a low level, avoiding the problem of energy loss, and the flexibility is higher.

[0009] In some exemplary embodiments, the voltage boosting feedback module comprises a first voltage dividing resistor and a second voltage dividing resistor; the first voltage dividing resistor is connected with the output end of the voltage boosting controller and the first end of the output voltage adjustment module at one end, and connected with the third end of the output voltage adjustment module and the feedback end of the voltage boosting controller at the other end at a first node; the second voltage dividing resistor is connected at the first node at one end, and grounded at the other end.

[0010] In some example embodiments, the output voltage adjustment module comprises a first resistor, a second resistor, a third resistor, a first switch tube and a second switch tube; one end of the first resistor is connected with one end of the first voltage dividing resistor and a first end of the first switch tube, the other end of the first resistor is connected with one end of the second resistor and a controlled end of the first switch tube, the other end of the second resistor is connected with a first end of the second switch tube, a controlled end of the second switch tube is connected with an output end of the control circuit, a second end of the second switch tube is grounded, a second end of the first switch tube is connected with one end of the third resistor, the other end of the third resistor is connected with the first node; when the rectifier circuit is powered off, the control circuit is configured to send a first control signal to the second switch tube to make the first switch tube and the second switch tube conductive, and the first voltage dividing resistor and the third resistor are connected in parallel.

[0011] In some example embodiments, the output voltage adjustment module comprises a fourth resistor, a fifth resistor, a third switch tube and a fourth switch tube; one end of the fourth resistor is connected with one end of the first voltage dividing resistor and one end of the fifth resistor, the other end of the fourth resistor is connected with a first end of the third switch tube, the other end of the fifth resistor is connected with a controlled end of the third switch tube and a first end of the fourth switch tube, a second end of the third switch tube is connected with the first node, a controlled end of the fourth switch tube is connected with an output end of the control circuit, a second end of the fourth switch tube is grounded; when the rectifier circuit is powered off, the control circuit is configured to send a second control signal to the fourth switch tube to make the third switch tube and the fourth switch tube conductive, and the first voltage dividing resistor and the fourth resistor are connected in parallel.

[0012] In some example embodiments, the boost enable module comprises a sixth resistor and a voltage stabilizing diode; one end of the sixth resistor is connected with an output end of the boost controller; a negative electrode of the voltage stabilizing diode is connected with the other end of the sixth resistor and an enable end of the boost controller, and a positive electrode is grounded.

[0013] In some example embodiments, the electronic control system further comprises a step-down circuit, one end of which is connected with a first end of the output voltage adjustment module, and the other end of which is connected with an input end of the control circuit.

[0014] In some example embodiments, the boost control module further comprises a first inductor, a fifth switch tube, a first diode and a first capacitor; one end of the first inductor is connected with a positive electrode of the energy storage module, the other end of the first inductor is connected with a first end of the fifth switch tube and a positive electrode of the first diode, a second end of the fifth switch tube is grounded, a controlled end of the fifth switch tube is connected with an output end of the boost controller, a negative electrode of the first diode is connected with a first pole plate of the first capacitor, a first end of the boost enable module, a first end of the boost feedback module and a first end of the output voltage adjustment module, and a second pole plate of the first capacitor is grounded.

[0015] In some example embodiments, the backup power supply circuit comprises a charging circuit, an energy storage module and a boost circuit connected in sequence, and a control circuit connected with the charging circuit and the boost circuit, the charging circuit connected with the rectifier circuit and the energy storage module respectively, and the boost circuit connected with the valve driving circuit, and configured to supply power to the valve driving circuit and the control circuit when the rectifier circuit is powered off; wherein the charging circuit comprises a general buck controller, a sampling module, an amplification module and a buck feedback module, an input end of the general buck controller connected with one output of the rectifier circuit, a first end of the sampling module connected with an output end of the general buck controller, a second end of the sampling module connected with a positive electrode of the energy storage module, a first input end of the amplification module connected with the first end of the sampling module, a second input end of the amplification module connected with the second end of the sampling module, an input end of the buck feedback module connected with an output end of the amplification module, a controlled end of the buck feedback module connected with the second end of the sampling module, and an output end of the buck feedback module connected with a feedback end of the general buck controller.

[0016] In some example embodiments, the amplification module comprises a seventh resistor, a general amplifier and an eighth resistor, one end of the seventh resistor connected with the second end of the sampling module, a non-inverting input end of the general amplifier connected with the first end of the sampling module, an inverting input end of the general amplifier connected with the other end of the seventh resistor, an output end of the general amplifier connected with the input end of the buck feedback module, one end of the eighth resistor connected with the inverting input end of the general amplifier, and the other end of the eighth resistor connected with the output end of the general amplifier.

[0017] In some example embodiments, the charging circuit further comprises a ninth resistor, one end of the ninth resistor connected with the output end of the general amplifier, and the other end of the ninth resistor connected with the input end of the buck feedback module.

[0018] In some example embodiments, the buck feedback module comprises a triode, a third voltage dividing resistor and a fourth voltage dividing resistor, a first end of the triode connected with the output end of the amplification module, a controlled end of the triode connected with the second end of the sampling module, and a second end of the triode connected with the feedback end of the general buck controller; one end of the third voltage dividing resistor connected with the output end of the general buck controller, the other end of the third voltage dividing resistor connected with the output end of the triode at a second node; one end of the fourth voltage dividing resistor connected with the second node, and the other end of the fourth voltage dividing resistor grounded.

[0019] In some example embodiments, the sampling module comprises a sampling resistor, one end of the sampling resistor connected with the output end of the general buck controller and the first input end of the amplification module, and the other end of the sampling resistor connected with the second input end of the amplification module and the positive electrode of the energy storage module.

[0020] In some example embodiments, the charging circuit further comprises a second inductor, one end of the second inductor is connected to the output end of the general buck controller, and the other end of the second inductor is connected to the first end of the sampling module; wherein the sampling module is configured to collect the inductor current, and the waveform of the inductor current is a triangular wave.

[0021] In some example embodiments, the charging circuit further comprises a second capacitor, the first plate of the second capacitor is connected to the other end of the second inductor and the first end of the sampling module, and the second plate of the second capacitor is grounded; wherein the sampling module is configured to collect the average value of the charging current, and the waveform of the average value of the charging current is a flat wave.

[0022] In some example embodiments, the backup power supply circuit comprises a plurality of charging circuits, and the second ends of the plurality of sampling modules are all connected to the positive electrode of the same energy storage module.

[0023] In some example embodiments, the output of the rectifier circuit is divided into two paths, one path is connected to the valve drive circuit and the control circuit, and is configured to rectify the alternating current into direct current and supply power to the valve drive circuit and the control circuit when there is no power outage; the other path is connected to the charging circuit to charge the energy storage module through the charging circuit.

[0024] In some example embodiments, the electronic control system further comprises a discharging circuit, the discharging circuit is connected in parallel to the output end of the boost circuit, and is configured to use the output voltage obtained after the boost circuit boosts the positive electrode voltage of the energy storage module to boost and discharge the energy storage module.

[0025] In some example embodiments, the discharging circuit comprises a discharging switch and a discharging load, the discharging load is connected in series with the discharging switch to form a series branch, one end of the series branch is connected to the output end of the boost circuit, and the other end of the series branch is grounded; wherein when the discharging switch is turned on, the discharging circuit forms a discharging loop to make the discharging load consume the electrical energy of the energy storage module.

[0026] In some example embodiments, the discharging switch is a manual switch, or the discharging switch is an electronic switch, and the controlled end of the electronic switch is connected to the control circuit.

[0027] In some example embodiments, the boost circuit comprises a boost inductor, a semiconductor switch, a second diode, an energy storage capacitor, and a boost controller; one end of the boost inductor is connected to the positive electrode of the energy storage module, the other end of the boost inductor is connected to the input end of the semiconductor switch and the anode of the second diode; the cathode of the second diode is connected to one end of the energy storage capacitor and serves as the output end of the boost circuit and is connected to the discharging circuit, the other end of the energy storage capacitor is grounded; the controlled end of the semiconductor switch is connected to the boost controller, and the output end is grounded.

[0028] In some example embodiments, the energy storage module comprises one or more supercapacitors or batteries connected in series, and the positive poles of the supercapacitors or batteries are connected to the voltage boosting circuit.

[0029] In some example embodiments, the charging circuit is configured to charge the energy storage module after discharging.

[0030] In some example embodiments, the backup power supply circuit comprises the charging circuit, the energy storage module and the voltage boosting circuit connected in sequence, and the control circuit is further connected to the charging circuit and the voltage boosting circuit. The charging circuit is connected to the rectifier circuit and the energy storage module respectively, and the voltage boosting circuit is connected to the valve driving circuit. The backup power supply circuit is configured to supply power to the valve driving circuit and the control circuit when the rectifier circuit is powered off. The electric control system further comprises an electric quantity display circuit connected to the energy storage module and configured to display the current electric quantity of the energy storage module.

[0031] In some example embodiments, the electric quantity display circuit comprises a plurality of lamp bead display circuits connected in parallel, and the plurality of lamp bead display circuits are controlled to be selectively lit according to the positive pole voltage of different energy storage modules.

[0032] In some example embodiments, the electric control system further comprises a leak detection sensor connected to the control circuit. The control circuit is configured to send a control instruction to close the valve assembly when the leak detection sensor detects a refrigerant leakage in the refrigerant circuit.

[0033] In some example embodiments, the backup power supply circuit and the valve driving circuit share one rectifier circuit.

[0034] In a second aspect, the embodiments of the present application provide a heating and ventilation system, comprising: an outdoor unit, a refrigerant circuit, an indoor unit, a valve assembly and the electric control system of any one of the optional manners of the first aspect; the refrigerant circuit is in communication with the outdoor unit; the indoor unit is in communication with the outdoor unit through the refrigerant circuit; the valve assembly is arranged on the refrigerant circuit; and the valve driving circuit is connected to the valve assembly. BRIEF DESCRIPTION OF DRAWINGS

[0035] FIG. 1 is a schematic diagram of a module structure of a heating and ventilation system in an example embodiment of the related art;

[0036] FIG. 2 is another schematic diagram of a module structure of a heating and ventilation system in an example embodiment of the related art;

[0037] FIG. 3 is still another schematic diagram of a module structure of a heating and ventilation system in an example embodiment of the related art;

[0038] FIG. 4 is a schematic diagram of a module structure of an electric control system in an example embodiment of the present application;

[0039] FIG. 5 is a schematic diagram of a module structure of an electric control system in an example embodiment of the related art;

[0040] Fig. 6 is a schematic diagram of a module structure of an electric control system according to another embodiment of the present application;

[0041] Fig. 7 is a schematic diagram of a circuit structure of an electric control system according to an embodiment of the present application;

[0042] Fig. 8 is a schematic diagram of a circuit structure of an electric control system according to another embodiment of the present application;

[0043] Fig. 9 is a schematic diagram of a circuit structure of an electric control system according to another embodiment of the present application;

[0044] Fig. 10 is a schematic diagram of a circuit structure of an electric control system according to another embodiment of the present application;

[0045] Fig. 11 is a schematic diagram of a circuit structure of an electric control system according to another embodiment of the present application;

[0046] Fig. 12 is a schematic diagram of a circuit structure of an electric control system according to another embodiment of the present application;

[0047] Fig. 13 is a schematic diagram of a circuit structure of an electric control system according to another embodiment of the present application;

[0048] Fig. 14 is a schematic diagram of a module structure of a charging circuit according to an embodiment of the related art;

[0049] Fig. 15 is a schematic diagram of a module structure of a charging circuit according to another embodiment of the related art;

[0050] Fig. 16 is a schematic diagram of a module structure of a charging circuit according to another embodiment of the related art;

[0051] Fig. 17 is a schematic diagram of a module structure of a charging circuit according to an embodiment of the present application;

[0052] Fig. 18 is a schematic diagram of a circuit structure of a charging circuit according to an embodiment of the present application;

[0053] Fig. 19 is a schematic diagram of a circuit structure of a charging circuit according to another embodiment of the present application;

[0054] Fig. 20 is a schematic diagram of a circuit structure of a charging circuit according to another embodiment of the present application;

[0055] Fig. 21 is a schematic diagram of a circuit structure of a charging circuit according to another embodiment of the present application;

[0056] Fig. 22 is a schematic diagram of a circuit structure of a charging circuit according to another embodiment of the present application;

[0057] Fig. 23 is a schematic diagram of a module structure of a part of an electric control system according to an embodiment of the related art;

[0058] Fig. 24 is a schematic diagram of a module structure of an electric control system according to another embodiment of the present application;

[0059] Fig. 25 is a schematic diagram of a module structure of a part of an electric control system according to another embodiment of the present application;

[0060] Fig. 26 is a schematic diagram of a circuit structure of a part of an electric control system according to another embodiment of the present application;

[0061] Fig. 27 is a schematic diagram of a circuit structure of another part of an electric control system according to another embodiment of the present application;

[0062] Fig. 28 is a schematic diagram of a module structure of an electric quantity display circuit according to another embodiment of the present application.

[0063] Legend: 1, electric control system; 11, control circuit; 12, valve driving circuit; 13, rectifier circuit; 14, backup power supply circuit; 141, charging circuit; 1411, step-down controller; 1412, operational amplifier module; 1413, special high-side current sampling chip; 1414, special super capacitor controller; 1415, sampling module; 1416, amplification module; 1417, step-down feedback module; 14171, triode; 142, energy storage module; 143, step-up circuit; 1431, step-up controller; 1432, feedback unit; 1433, step-up enable module; 1434, step-up feedback module; 1435, output voltage adjustment module; 1436, semiconductor switch; 15, step-down circuit; 16, discharging circuit; 161, discharging switch; 162, discharging load; 17, electric quantity display circuit; 2, outdoor unit; 21, compressor; 22, four-way switching valve; 23, liquid storage tank; 24, outdoor heat exchanger; 25, first expansion valve; 3, refrigerant circuit; 4, indoor unit; 41, indoor heat exchanger; 42, second expansion valve; 5, valve assembly; 311, liquid valve; 312, gas valve; 6, heating ventilation system;

[0064] DR1, first voltage dividing resistor; DR2, second voltage dividing resistor; DR3, first voltage dividing resistor; DR4, second voltage dividing resistor; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, sixth resistor; RS, sampling resistor; R7, seventh resistor; R8, eighth resistor; R9, ninth resistor; Q1, first switch tube; Q2, second switch tube; Q3, third switch tube; Q4, fourth switch tube; Q5, fifth switch tube; D1, first diode; D2, second diode; ZD, voltage stabilizing diode; FB, feedback signal; VFB, feedback voltage; EN, enable signal; VC1, capacitor voltage; C1, super capacitor; C2, first capacitor; C3, second capacitor; C4, energy storage capacitor; C, collector; B, base; E, emitter; VCC, power supply port; I / O, input and output port; GND, ground terminal; I, main power supply; F, first node; G, second node; L1, first inductor; L2, second inductor; L3, boost inductor; IL, inductor current; DC, direct current power supply; IC, charging current; VAO, amplified voltage; AMP, general-purpose amplifier; Q, PNP triode; A, high-voltage gas tube; H, low-voltage gas tube; K, high-voltage liquid tube.

[0065] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0066] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will further describe the embodiments of the present application in conjunction with the drawings.

[0067] The following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0068] In the description of the present application, it should be understood that the terms "first", "second" and the like are only set for the purpose of description, and cannot be understood as indicating or implying relative importance. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise stated, "multiple" means two or more. "And / or", the association between the associated objects, means that there can be three kinds of relationships, for example, A and / or B, which can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. The character " / " generally represents that the front and rear associated objects are a kind of "or" relationship.

[0069] 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 in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0070] The embodiments of the present application provide a heating and ventilation system, which includes but is not limited to an air conditioner, a multi-connected air conditioner, a heat pump system, a central air conditioner, etc. The heating and ventilation system can be applied in large-scale places such as shopping malls and office buildings.

[0071] In the related art, as shown in FIGS. 1-2, the heating and ventilation system 6 is generally composed of an electric control system 1, an outdoor unit 2, a refrigerant circuit 3, an indoor unit 4, and a valve assembly 5. The refrigerant circuit 3 is in communication with the outdoor unit 2. The indoor unit 4 is in communication with the outdoor unit 2 through the refrigerant circuit 3. The valve assembly 5 is arranged on the refrigerant circuit 3, and the valve assembly 5 maintains the opening degree in a non-powered state. The outdoor unit 2 is in communication with the refrigerant circuit 3 through a high-pressure gas pipe A for flowing high-pressure gas refrigerant, a low-pressure gas pipe H for flowing low-pressure gas refrigerant, and a high-pressure liquid pipe K for flowing high-pressure liquid refrigerant, so that after fresh air is processed by dust removal, dehumidification (or humidification), temperature reduction (or temperature increase), etc., the processed air is transported to the indoor unit 4 through the high-pressure gas pipe A, the low-pressure gas pipe H, the high-pressure liquid pipe K, and the refrigerant circuit 3. It is worth noting that a plurality of indoor units 4 can be connected to the same outdoor unit 2 or different outdoor units 2.

[0072] That is, when the heating and ventilation system 1 is a cold and heat simultaneous type heating and ventilation system 6, the outdoor unit 2 is connected to a plurality of refrigerant circuits 3 through the high-pressure gas pipe A, the low-pressure gas pipe H, and the high-pressure liquid pipe K. The valve assembly 5 in each refrigerant circuit 3 includes a high-pressure gas valve, a low-pressure gas valve, and a liquid valve 312. One refrigerant circuit 3 corresponds to one indoor unit 4. For example, as shown in FIG. 2, four refrigerant circuits 3 correspond to four indoor units 4. It can be understood that by controlling the refrigerant circuit 3, some indoor units 4 can be in a cooling mode, and other indoor units 4 can be in a cooling state. That is, the electric control system 1 can control the opening or closing of the high-pressure gas valve and the low-pressure gas valve to switch the flow direction of the refrigerant, thereby controlling the working state of the indoor unit 4. The plurality of indoor units 4 can have different working states. For example, at the same time, some indoor units 4 work in a cooling state, some indoor units 4 work in a heating state, and the remaining indoor units 4 work in an off state.

[0073] The valve driving circuit 12 is connected with the valve assembly 5, and the electric control system 1 can drive the valve assembly 5 to act through the valve driving circuit 12, so that the HVAC system 6 can realize the switching and working mode control of the indoor unit, wherein the working mode at least includes the cooling mode and the heating mode.

[0074] Referring to FIG. 3, specifically, the outdoor unit 2 includes a compressor 21, a four-way switching valve 22, a liquid accumulator 23, an outdoor heat exchanger 24 and a first expansion valve 25, and the valve assembly 5 is arranged on the refrigerant circuit 3, wherein the valve assembly 5 can include a liquid valve 311 and a gas valve 312. The indoor unit 4 includes an indoor heat exchanger 41 and a second expansion valve 42, wherein the outdoor unit 2 and the indoor unit 4 can be connected through the refrigerant circuit 3.

[0075] When the HVAC system 6 works in the cooling mode, the four-way switching valve 22 is switched to the cooling mode, at this time, the A end of the four-way switching valve 22 is communicated with the B end of the four-way switching valve 22, and the C end of the four-way switching valve 22 is communicated with the D end of the four-way switching valve 22. It can be understood that, in cooling, the refrigerant flows out of the compressor 21, enters the outdoor heat exchanger 24 through the A end of the four-way switching valve 22 and the B end of the four-way switching valve 22, and after being condensed by the outdoor heat exchanger 24, the refrigerant enters the indoor heat exchanger 41 through the first expansion valve 25, the liquid valve 311 and the second expansion valve 42, so that the indoor heat exchanger 41 cools the indoor air, and then the refrigerant flows into the liquid accumulator 23 through the indoor heat exchanger 41, the gas valve 312, the D end of the four-way switching valve 22 and the C end of the four-way switching valve 22 in sequence, and the refrigerant in the liquid accumulator 23 enters the compressor 21 for compression to enter the next cooling cycle, at this time, the outdoor heat exchanger 24 functions as a condenser, and the indoor heat exchanger 41 functions as an evaporator.

[0076] When the HVAC system 6 works in the heating mode, the four-way switching valve 22 is switched to the heating mode, at this time, the A end of the four-way switching valve 22 is communicated with the D end of the four-way switching valve 22, and the B end of the four-way switching valve 22 is communicated with the C end of the four-way switching valve 22. It can be understood that, in heating, the refrigerant flows out of the compressor 21, enters the indoor heat exchanger 41 through the A end of the four-way switching valve 22, the D end of the four-way switching valve 22 and the gas valve 312, and the refrigerant can release heat to the indoor through the indoor heat exchanger 41 to increase the indoor temperature, and then the refrigerant can flow into the liquid accumulator 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 in sequence, and the refrigerant flowing into the liquid accumulator 23 enters the compressor 21 for compression to enter the next heating cycle, at this time, the outdoor heat exchanger 24 functions as an evaporator, and the indoor heat exchanger 41 functions as a condenser.

[0077] That is, the outdoor unit 2 and the indoor unit 4 are generally provided with heat exchangers, when the heating and ventilation system 6 needs to work in the cooling mode, the electric control system 1 receives the cooling instruction, and drives the valve assembly 5 to act, the indoor unit 4 is opened, at this time, the heat exchanger in the outdoor unit 2 acts as a condenser, and the heat exchanger in the indoor unit 4 acts as an evaporator. When the heating and ventilation system 6 needs to work in the heating mode, the electric control system 1 receives the heating instruction, and drives the valve assembly 5 to act, the indoor unit 4 is opened, at this time, the heat exchanger in the outdoor unit 2 acts as an evaporator, and the heat exchanger in the indoor unit 4 acts as a condenser.

[0078] As shown in FIG. 4, the electric control system 1 generally includes a control circuit 11, a valve driving circuit 12, a rectifier circuit 13 and a backup power supply circuit 14, wherein the control circuit 11 is electrically connected with the valve driving circuit 12 to control the valve driving circuit 12, here, it can be understood that the valve driving circuit 12 is connected with the valve assembly, and the control circuit 11 controls the valve driving circuit 12, that is, the valve assembly can be driven to act to make the heating and ventilation system 6 correspondingly realize different effects. The rectifier circuit 13 is connected with the valve driving circuit 12 and the control circuit 11 to rectify the alternating current into direct current and supply power to the valve driving circuit 12 and the control circuit 11 when the power is not off, so that the heating and ventilation system 6 can work normally.

[0079] When the rectifier circuit 13 is powered off, in order to ensure that the heating and ventilation system 6 can work normally, the backup power supply circuit 14 is generally used for power supply. However, in the related art, when the control circuit 11 program is wrong, the enable signal sent by the control circuit 11 may be temporarily lost, so that the backup power supply circuit 14 cannot supply power to the control circuit 11, resulting in that the control circuit 11 loses power, the use reliability is low, and the normal use of the control circuit 11 is affected.

[0080] Therefore, the embodiment of the present application provides a heating and ventilation system and an electric control system thereof, the enable signal of the electric control system 1 is not controlled by the control circuit 11, that is, even if the control circuit 11 has the problem of program error, it will not affect the normal use of the backup power supply circuit 14, and the working reliability and stability of the backup power supply circuit 14 are ensured.

[0081] As shown in Figure 4, in some embodiments, the backup power circuit 14 may include a charging circuit 141, an energy storage module 142, and a boost circuit 143 connected in sequence. The control circuit 11 is connected to the charging circuit 141 and the boost circuit 143. The charging circuit 141 is connected to the rectifier circuit 13 and the energy storage module 142, respectively. The boost circuit 143 is connected to the valve drive circuit. When the rectifier circuit 13 is not powered off, the charging circuit 141 can charge the energy storage module 142. When the rectifier circuit 13 is powered off, the boost circuit 143 can supply power to the valve drive circuit 12 and the control circuit 11 to ensure that the HVAC system 6 can work normally.

[0082] As shown in Figure 5, the boost circuit 143 in the related technology includes a boost controller 1431 and a feedback unit 1432. The output terminal of the boost controller 1431 is connected to the positive terminal of the energy storage module 142 and the first terminal of the feedback unit 1432. The enable terminal of the boost controller 1431 is connected to the input / output port (I / O) of the control circuit 11. The feedback terminal of the boost controller 1431 is connected to the second terminal of the feedback unit 1432. The power supply port (VCC) of the control circuit 11 is connected to the output terminal of the boost controller 1431 and the positive terminal of the main power supply (I). The ground terminal (GND) of the control circuit 11, the third terminal of the feedback unit 1432, and one terminal of the boost controller 1431 are grounded. When the rectifier circuit 13 is not powered off, i.e., when the main power supply I is not powered off, the control circuit 11 works normally. At this time, it does not output the enable signal EN to the boost controller 1431, i.e., the boost controller 1431 does not work. When the rectifier circuit 13 is powered off, i.e., when the main power supply I is powered off, the control circuit 11 outputs the enable signal EN to the boost controller 1431. At this time, the boost controller 1431 works and draws energy from the energy storage module 142 and provides it to the power port VCC of the control circuit 11, so that the control circuit 11 can work normally.

[0083] However, when the main power supply I fails, if there is a program error in the control circuit 11, the enable signal EN may temporarily disappear. At this time, the control circuit 11 cannot output the enable signal EN to the boost controller 1431, causing the boost controller 1431 to malfunction; that is, the boost controller 1431 will stop drawing energy from the energy storage module 142. Consequently, the power port VCC of the control circuit 11 has no power input, causing the control circuit 111 to lose power, and the enable signal EN cannot be restored, affecting the normal operation of the boost circuit 143. Even if a watchdog timer is set in the software at this time, the loss of power to the control circuit 11 prevents the software from resetting to a normal state, still affecting the normal operation of the boost circuit 143.

[0084] The following is an exemplary description of the HVAC system 6 and its electrical control system provided in the embodiments of this application.

[0085] The HVAC system 6 provided in this embodiment may include the aforementioned electronic control system 1, outdoor unit 2, refrigerant circuit 3, indoor unit 4, and valve assembly 5. The electronic control system 1 can drive the valve assembly 5 to operate, thereby enabling the HVAC system 6 to control the switching and operating mode of the indoor unit 4. As shown in Figure 4, the electronic control system 1 may include a control circuit 11, a valve drive circuit 12, a rectifier circuit 13, and a backup power circuit 14. The backup power circuit 14 includes a charging circuit 141, an energy storage module 142, and a boost circuit 143 connected in sequence. The specific connection of the electronic control system 1 can be found in the above description and will not be repeated here.

[0086] In one example, as shown in Figure 6, 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 the boost controller 1431 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 output terminal of the boost controller 1431. The output terminal of circuit 31 is connected to the second terminal of the boost feedback module 1434, which 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 of the control circuit 11 (I / O port as shown in Figure 6). 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.

[0087] 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 can be 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 can be adjusted to keep the output voltage of the boost circuit 143 at a low level, avoiding energy loss and providing high flexibility.

[0088] The energy storage module 142 in this application can be the supercapacitor C1 shown in Figure 7. Below, using the supercapacitor C1 as an example, an exemplary description of the electrical control system 1 and the HVAC system 6 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.

[0089] To monitor the output voltage of the boost circuit 143 in real time, and to prevent the control circuit 11 from being over-voltaged due to excessive output voltage, which could damage the control circuit 11, or from being under-voltage and unable to meet the power supply requirements of the control circuit 11, thus preventing the control circuit 11 from functioning properly, the boost feedback module 1434 includes a first voltage divider resistor DR1 and a second voltage divider resistor DR2. One end of the first voltage divider resistor DR1 is connected to the output terminal of the boost controller 1431 and the first terminal of the output voltage adjustment module 1435. The other end of the first voltage divider resistor DR1 is connected to the third terminal of the output voltage adjustment module 1435 and the feedback terminal of the boost controller 1431 at the first node F. One end of the second voltage divider resistor DR2 is connected to the first node F, and the other end of the second voltage divider resistor DR2 is grounded. In this example, the output voltage of the boost circuit 143 is fed back to the feedback terminal of the boost controller 1431 through the first voltage divider resistor DR1, so that the boost controller 1431 can always receive the feedback voltage VFB, thereby realizing real-time detection of the output voltage output by the boost circuit 143. This avoids the problem that the output voltage is too large, causing overvoltage of the control circuit 11, or even damage to the control circuit 11, or that the output voltage is too small, failing to meet the power supply requirements of the control circuit 11, causing the control circuit 11 to malfunction.

[0090] Under different requirements, the feedback voltage VFB fed back to the feedback terminal of the boost controller 1431 by the boost feedback module 1434 can be adjusted by the output voltage adjustment module 1435 to adjust the output voltage of the boost circuit 143, so that the output voltage can meet the power supply requirements under different needs.

[0091] In one example, as shown in Figure 8, the output voltage adjustment module 1435 includes a first resistor R1, a second resistor R2, a third resistor R3, a first switch Q1, and a second switch Q2. One end of the first resistor R1 is connected to one end of the first voltage divider resistor DR1 and the first end of the first switch Q1. The other end of the first resistor R1 is connected to one end of the second resistor R2 and the controlled end of the first switch Q1. The other end of the second resistor R2 is connected to the first end of the second switch Q2. The controlled end of the second switch Q2 is connected to the output end of the control circuit 11. The second end of the second switch Q2 is grounded. The second end of the first switch Q1 is connected to one end of the third resistor R3. The other end of the third resistor R3 is connected to the first node F.

[0092] In this example, when the rectifier circuit 13 is not powered off, i.e., when the main power supply I supplies power to the control circuit 11, there is no need to change the output voltage of the boost circuit 143. The first switch Q1 and the second switch Q2 are turned on, and the third resistor R3 is connected in parallel with the first voltage divider resistor DR1. At this time, the voltage output by the boost circuit 143 is low (e.g., 8V) and is less than the power supply voltage of the main power supply I. That is, the main power supply I still supplies power at this time.

[0093] When the rectifier circuit 13 loses power, the boost circuit 143 serves as a backup power source to supply power to the control circuit 11. The first switch Q1 and the second switch Q2 are turned off. At this time, the voltage output by the boost circuit 143 is high (e.g., 12V) to supply power to other circuits in the system, enabling the system to operate normally. When the software of the control circuit 11 malfunctions, if the input / output port (I / O) output is high, the first switch Q1 and the second switch Q2 are turned on. The third resistor R3 is connected in parallel with the first voltage divider resistor DR1. This reduces the resistance value of the upper voltage divider resistor in the boost feedback module 1434, thereby reducing the output voltage of the boost circuit 143, for example, to a low level of 8V, and maintaining it at a low level to avoid energy loss. The low level output by the boost circuit 143 can still maintain power to the control circuit 11, allowing the software of the control circuit 11 to automatically recover. If the input / output port I / O output is low, the first switch Q1 and the second switch Q2 are turned off, and the output voltage of the boost circuit 143 remains high at 12V, which can still maintain the power supply to the control circuit 11 so that the software of the control circuit 11 can be automatically restored.

[0094] It is worth noting that the power supply requirement of the control circuit 11 is usually 5V or 3.3V. When the output voltage of the boost circuit 143 decreases to 8V, although it is a low level, it still meets the power supply requirement of the control circuit 11. Even if there is a voltage drop in the circuit, the voltage drop remains at about 2V. Therefore, the output voltage of the boost circuit 143 still meets the power supply requirement of the control circuit 11.

[0095] For example, as shown in Figure 9, the electronic control system 1 may also include a step-down circuit 15. One end of the step-down circuit 15 is connected to the first terminal of the output voltage adjustment module 1435 (i.e., one end of the first resistor R1), and the other end of the step-down circuit 15 is connected to the input terminal of the control circuit 11 (as shown in the power supply port VCC). The output voltage of the boost circuit 143 will be stepped down by the step-down circuit 15 before being output to the control circuit 11. Assuming that the output voltage of the boost circuit 143 is reduced to 8V, the voltage after being stepped down by the step-down circuit 15 may be around 5V, which still meets the power supply requirements of the control circuit 11.

[0096] Optionally, as shown in Figure 9, the first switching transistor Q1 can be a PNP transistor, and the second switching transistor Q2 can be an NPN transistor. The collector C of the second switching transistor Q2 is connected to the output terminal of the control circuit 11, the base B of the second switching transistor Q2 is connected to the other end of the second resistor R2, and the emitter E of the second switching transistor Q2 is grounded. The collector C of the first switching transistor Q1 is connected to one end of the second resistor R2, the emitter E of the first switching transistor Q1 is connected to one end of the first resistor R1, and the base B of the first switching transistor Q1 is connected to one end of the third resistor R3. The first switching transistor Q1 and the second switching transistor Q2 can be N-type metal-oxide-semiconductor (NMOS) field-effect transistors, P-type metal-oxide-semiconductor (PMOS) field-effect transistors, transistors, relays, or other switching devices or circuits. This application does not impose specific limitations on these devices.

[0097] Thus, 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, the output voltage of the boost circuit 143 is kept at a high level to ensure the power supply reliability of the boost circuit 143. 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 problems and providing high flexibility.

[0098] In another example, as shown in Figure 10, the output voltage adjustment module 1435 may include a fourth resistor R4, a fifth resistor R5, a third switch Q3, and a fourth switch Q4. One end of the fourth resistor R4 is connected to one end of the first voltage divider resistor DR1 and one end of the fifth resistor R5. The other end of the fourth resistor R4 is connected to the first end of the third switch Q3. The other end of the fifth resistor R5 is connected to the controlled end of the third switch Q3 and the first end of the fourth switch Q4. The second end of the third switch Q3 is connected to the first node F. The controlled end of the fourth switch Q4 is connected to the output end of the control circuit 11. The second end of the fourth switch Q4 is grounded.

[0099] In this example, when the rectifier circuit 13 is not powered off, that is, when the main power supply I supplies power to the control circuit 11, the third switch Q3 is turned on and the fourth switch Q4 is turned off. At this time, the fourth resistor R4 and the first voltage divider resistor DR1 are connected in parallel, and the voltage output by the boost circuit 143 is low (e.g., 8V), which is less than the power supply voltage of the main power supply I. That is, the main power supply I still supplies power at this time.

[0100] When the rectifier circuit 13 loses power, the boost circuit 143 serves as a backup power source to supply power to the control circuit 11. The third switch Q3 is turned off, and the fourth switch Q4 is turned on. At this time, the voltage output by the boost circuit 143 is high (e.g., 12V) to supply power to other circuits in the system, enabling the system to operate normally. When the software of the control circuit 11 malfunctions, if the input / output port (I / O) output is low, the third switch Q3 is turned on, and the fourth switch Q4 is turned off. This causes the first voltage divider resistor DR1 and the fourth resistor R4 to be connected in parallel. This reduces the resistance value of the upper voltage divider resistor in the boost feedback module 1434, thereby reducing the output voltage of the boost circuit 143, for example, to a low level of 8V, maintaining it at a low level to avoid energy loss. At this time, the low level output by the boost circuit 143 can still maintain power to the control circuit 11, allowing the software of the control circuit 11 to automatically recover. If the input / output port I / O output is high, the third switch Q3 is cut off and the fourth switch Q4 is turned on. The output voltage of the boost circuit 143 is still high at 12V, so the power supply to the control circuit 11 can still be maintained, allowing the software of the control circuit 11 to recover automatically.

[0101] For example, as shown in Figure 11, one end of the buck circuit 15 is connected to the first end of the output voltage adjustment module 1435 (i.e., one end of the fifth resistor R5), and the other end of the buck circuit 15 is connected to the input terminal of the control circuit 11 (as shown in the power supply port VCC). The output voltage of the boost circuit 143 is stepped down by the buck circuit 15 before being output to the control circuit 11. Assuming that the output voltage of the boost circuit 143 is reduced to 8V, the voltage after being stepped down by the buck circuit 15 may be around 5V, which still meets the power supply requirements of the control circuit 11.

[0102] Optionally, as shown in Figure 11, the third switch Q3 and the fourth switch Q4 can be NPN transistors. The base B of the fourth switch Q4 is connected to the output terminal of the control circuit 11, the collector C of the fourth switch Q4 is connected to the base B of the third switch Q3, the emitter E of the fourth switch Q4 is grounded, the collector C of the third switch Q3 is connected to the other end of the fourth resistor R4, and the emitter E of the third switch Q3 is connected to the first node F. The third switch Q3 and the fourth switch Q4 can also be NMOS transistors, PMOS transistors, transistors, relays, or other devices with switching functions, or other devices or circuits with switching functions. This application does not impose specific limitations on these.

[0103] Thus, 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, the output voltage of the boost circuit 143 is kept at a high level to ensure the power supply reliability of the boost circuit 143. 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 problems and providing high flexibility.

[0104] In one example, as shown in Figure 12, the boost control module further includes a first inductor L1, a fifth switch Q5, a first diode D1, and a first capacitor C2. One end of the first inductor L1 is connected to the positive terminal of the energy storage module 142 (i.e., supercapacitor C1), and the other end of the first inductor L1 is connected to the first terminal of the fifth switch Q5 and the positive terminal of the first diode D1. The second terminal of the fifth switch Q5 is grounded, and the controlled terminal of the fifth switch Q5 is connected to the output terminal of the boost controller 1431. The negative terminal of the first diode D1 is connected to the first plate of the first capacitor C2, the first terminal of the boost enable module 1433, the first terminal of the boost feedback module 1434, and the first terminal of the output voltage adjustment module 1435. The second plate of the first capacitor C2 is grounded. In this example, the boost controller 1431 can control whether to provide energy to the control circuit 11 by controlling the on / off state of the fifth switch Q5.

[0105] Optionally, as shown in Figure 12, the fifth switch Q5 can be an NMOS transistor. The source of the fifth switch Q5 is grounded, the gate of the fifth switch Q5 is connected to the output terminal of the boost controller 1431, and the drain of the fifth switch Q5 is connected to the other end of the first inductor L1 and the anode of the first diode D1. The fifth switch Q5 can also be a PMOS transistor, a triode, a relay, or other switching devices or circuits. This application does not impose specific limitations on this.

[0106] In one example, as shown in Figure 13, the boost enable module 1433 may include a sixth resistor R6 and a Zener diode ZD. One end of the sixth resistor R6 is connected to the output terminal of the boost controller 1431, and the cathode of the Zener diode ZD is connected to the other end of the sixth resistor R6 and the enable terminal of the boost controller 1431. The anode of the Zener diode ZD is grounded. The boost controller 1431 can obtain an enable signal EN based on the sixth resistor R6 and the Zener diode ZD. Thus, the enable signal of the boost controller 1431 is not controlled by the control circuit 11. Even if there is a program error in the control circuit 11, it will not affect the normal operation of the boost controller 1431, thereby ensuring the reliability and stability of the boost circuit 143.

[0107] To reduce the overall size of the electronic control system 1, the backup power supply circuit 14 and the valve drive circuit 12 share a single rectifier circuit 13. For example, the output of the rectifier circuit 13 can be divided into two paths: one output is connected to the valve drive circuit 12 and the control circuit 11 to rectify AC power into DC power and supply it to the valve drive circuit 12 and the control circuit 11 when there is no power outage; the other output is connected to the charging circuit 141 to charge and store energy in the supercapacitor C1. In this application, multiple rectifier circuits 13 can also be provided, each with a single output to power different valve drive circuits 12. This application does not impose specific limitations on this.

[0108] When the charging circuit 141 charges the energy storage module 142 to a certain value, the charging needs to be stopped. To do this, it is usually necessary to detect the feedback voltage VFB of the energy storage module 142 in order to control the charging current and determine whether the charging needs to be stopped.

[0109] Figure 14 shows a charging circuit 141 in the related technology, including a general-purpose buck controller 1411, an operational amplifier module 1412, a sampling resistor RS, and a second inductor L2. The first terminal of the general-purpose buck controller 1411 is connected to the output of the rectifier circuit 13, as shown in Figure 14. The output of the rectifier circuit 13 can be represented as a DC power supply DC. The first terminal of the general-purpose buck controller 1411 is connected to the positive terminal of the DC power supply DC. The second terminal of the general-purpose buck controller 1411 is connected to one end of the second inductor L2. The other end of the second inductor L2 is connected to the positive terminal of the energy storage module 142. One end of the sampling resistor RS is connected to the negative terminal of the energy storage module 142 and the first input terminal of the operational amplifier module 1412. The other end of the sampling resistor RS is connected to the second input terminal of the operational amplifier module 1412. The output terminal of the operational amplifier module 1412 is connected to the third terminal of the general-purpose buck controller 1411. The fourth terminal of the general-purpose buck controller 1411 is grounded to the negative terminal of the DC power supply DC.

[0110] When current flows through the energy storage module 142, current also flows through the sampling resistor RS, forming a voltage across the RS. The operational amplifier module 1412 amplifies this voltage and feeds it back to the general-purpose buck controller 1411. Here, it can be understood that the signal output from the operational amplifier module 1412 to the general-purpose buck controller 1411 is the feedback signal FB. The general-purpose buck controller 1411 can determine whether to terminate charging based on the feedback signal FB. In this example, the operational amplifier module 1412 typically consists of multiple resistors and operational amplifiers. Constant current charging of the energy storage module 142 can be achieved through the operational amplifier module 1412 and the sampling resistor RS. However, in this example, when the sampling resistor RS is connected to the negative terminal of the energy storage module 142, it is impossible to increase the charging current by connecting multiple charging circuits 141 in parallel, resulting in low charging efficiency and the inability to achieve simultaneous charging and discharging.

[0111] As shown in Figure 15, another charging circuit 141 in the related technology includes a general-purpose buck controller 1411, a dedicated high-side current sampling chip 1413, a sampling resistor RS, and a second inductor L2. The first terminal of the general-purpose buck controller 1411 is connected to the positive terminal of the DC power supply DC. The second terminal of the general-purpose buck controller 1411 is connected to one end of the second inductor L2. One end of the sampling resistor RS is connected to the other end of the second inductor L2 and the first terminal of the dedicated high-side current sampling chip 1413. The other end of the sampling resistor RS is connected to the positive terminal of the energy storage module 142 and the second terminal of the dedicated high-side current sampling chip 1413. The negative terminal of the energy storage module 142, the third terminal of the dedicated high-side current sampling chip 1413, the fourth terminal of the general-purpose buck controller 1411, and the negative terminal of the DC power supply DC are grounded.

[0112] When current flows through the sampling resistor RS, a voltage is generated across RS. The dedicated high-side current sampling chip 1413 can output a feedback signal FB to the general-purpose buck controller 1411 based on this voltage. The general-purpose buck controller 1411 can control the charging current and determine whether charging needs to be terminated based on the feedback signal FB. In this example, constant current charging of the energy storage module 1142 can be achieved through the sampling resistor RS and the dedicated high-side current sampling chip 1413. In this example, the dedicated high-side current sampling chip 1413 is typically an AD8210YRZ chip; however, this type of chip is a dedicated chip and has a higher cost.

[0113] As shown in Figure 16, another charging circuit 141 in the related technology includes a dedicated supercapacitor controller 1414, a sampling resistor RS, and a second inductor L2. The first terminal of the dedicated supercapacitor controller 1414 is connected to the positive terminal of the DC power supply DC. The second terminal of the dedicated supercapacitor controller 1414 is connected to one end of the second inductor L2. One end of the sampling resistor RS is connected to the other end of the second inductor L2 and the third terminal of the dedicated supercapacitor controller 1414. The other end of the sampling resistor RS is connected to the positive terminal of the energy storage module 142 and the fourth terminal of the dedicated supercapacitor controller 1414. The negative terminal of the energy storage module 142, the fifth terminal of the dedicated supercapacitor controller 1414, and the negative terminal of the DC power supply DC are grounded.

[0114] In this example, the dedicated supercapacitor controller 1414 integrates a constant current charging function. When current flows through the sampling resistor RS, a voltage is generated across the sampling resistor RS. The dedicated supercapacitor controller 1414 can use this voltage to achieve constant current charging of the energy storage module 142. However, there are certain differences between dedicated supercapacitor controllers 1414 manufactured by different manufacturers; that is, it is impossible to obtain two compatible chips. For example, the chip with model number BQ24640 cannot achieve compatibility with other chips, which has certain limitations.

[0115] Therefore, this application provides a heating, ventilation and air conditioning system and its electrical control system. The electrical control system has a low cost and can simultaneously connect multiple charging circuits in parallel to increase the charging current of the charging circuit and improve the charging efficiency.

[0116] In one example, as shown in Figure 17, the charging circuit 141 may include a general-purpose buck controller 1411, a sampling module 1415, an amplification module 1416, and a buck feedback module 1417. The input terminal of the general-purpose 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 DC, that is, the input terminal of the general-purpose buck controller 1411 is connected to the positive terminal of the DC power supply DC. 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.

[0117] 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.

[0118] 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 and 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.

[0119] This application utilizes a sampling module 1415 to detect and adjust the charging current IC. Optionally, as shown in Figure 18, the sampling module 1415 may include a sampling resistor RS. One end of the sampling resistor RS is connected to the output terminal of the general-purpose step-down controller 1411 and the first input terminal of the amplifier module 1416. The other end of the sampling resistor RS is connected to the second input terminal of the amplifier module 1416 and the positive terminal of the supercapacitor C1. By adjusting the resistance value of the sampling resistor RS, the magnitude of the charging current IC passing through the sampling resistor RS can be adjusted, thereby controlling the charging current IC within a certain range. This avoids the problem of the charging current IC being too large, exceeding the circuit's capacity and causing circuit damage, and also avoids the problem of the charging current IC being too small, resulting in excessively long charging time. Thus, by adjusting the resistance value of the sampling resistor RS to control the magnitude of the charging current IC, the charging reliability of the charging current IC is ensured. Simultaneously, the sampling resistor RS has high sampling accuracy and stability. The sampling resistor RS can improve the accuracy and stability of the voltage received by the amplifier module 1416. Furthermore, the resistance value of the sampling resistor RS is generally low, so it does not affect the normal operation of the charging circuit 141 while sampling. It is worth noting that the sampling module 1415 can also be selected from other devices or circuits with sampling functions, and this application does not impose specific restrictions on this.

[0120] To further improve the precise control of the charging current IC, the amplification module 1416 provided in this application can not only amplify the voltage on the sampling resistor RS to obtain the amplified voltage VAO, but also detect and adjust the charging current IC. For example, as shown in FIG18, the amplification module 1416 may include a seventh resistor R7, a general-purpose amplifier AMP, and an eighth resistor R8. One end of the seventh resistor R7 is connected to the second end of the sampling resistor RS, and the other end of the seventh resistor R7 is connected to the inverting input terminal ("-" as shown in FIG18) of the general-purpose amplifier AMP. The non-inverting input terminal ("+" as shown in FIG18) of the general-purpose amplifier AMP is connected to the first end of the sampling resistor RS. The output terminal of the general-purpose amplifier AMP is connected to the input terminal of the buck feedback module 1417. One end of the eighth resistor R8 is connected to the inverting input terminal of the general-purpose amplifier AMP, and the other end is connected to the output terminal of the general-purpose amplifier AMP.

[0121] In this example, the charging current IC will generate a voltage drop through the sampling resistor RS. The general-purpose amplifier AMP amplifies the voltage across the sampling resistor RS to obtain the amplified voltage VAO. At this time, the amplified voltage VAO can be obtained according to formula (1):

[0122] Where VAO is the amplified voltage, IC is the charging current, RS is the resistance value of the sampling resistor, R7 is the resistance value of the seventh resistor, and R8 is the resistance value of the eighth resistor.

[0123] In this example, by adjusting the resistance values ​​of the seventh resistor R7 and the eighth resistor R8, the charging current IC can be controlled to keep it within a certain range. This avoids the charging current IC being too large, exceeding the circuit's capacity and causing circuit damage, and also avoids the charging current IC being too small, resulting in excessively long charging time. Thus, by adjusting the resistance values ​​of the seventh resistor R7 and the eighth resistor R8 to control the magnitude of the charging current IC, the charging reliability of the charging current IC is ensured.

[0124] In one example, as shown in Figure 19, the charging circuit 141 may also include a ninth resistor R9. One end of the ninth resistor R9 is connected to the output of the general-purpose amplifier AMP, and the other end of the ninth resistor R9 is connected to the input of the buck feedback module 1417. The charging current IC can also be controlled by adjusting the resistance value of the ninth resistor R9, which will not be described in detail here.

[0125] In one example, as shown in Figure 19, the buck feedback module 1417 may include: a transistor 14171, a third voltage divider resistor DR3, and a fourth voltage divider resistor DR4. The first terminal of transistor 14171 is connected to the output terminal of amplifier module 1416 (i.e., the output terminal of general-purpose amplifier AMP), the controlled terminal of transistor 14171 is connected to the second terminal of sampling resistor RS, and the second terminal of transistor 14171 is connected to the feedback terminal of general-purpose buck controller 1411. One end of the third voltage divider resistor DR3 is connected to the output terminal of general-purpose buck controller 1411, and the other end of the third voltage divider resistor DR3 is connected to the output terminal of transistor 14171 at the second node G. One end of the fourth voltage divider resistor DR4 is connected to the second node G, and the other end of the fourth voltage divider resistor DR4 is grounded.

[0126] For example, as shown in Figure 20, taking transistor 14171 as a PNP transistor Q, the emitter E of PNP transistor Q is connected to the other end of the ninth resistor R9, the base B of PNP transistor Q is connected to the second end of the sampling resistor RS, and the collector C of PNP transistor Q is connected to the feedback terminal of the general-purpose buck controller 1411. In this example, after the general-purpose amplifier AMP outputs the amplified voltage VAO, the current flowing into the emitter E of PNP transistor Q can be obtained according to formula (2): I1=(VAO-V EB ) / R9 (2)

[0127] Where VAO is the amplification voltage, V EB R is the voltage between the base and emitter, and R9 is the resistance of the ninth resistor.

[0128] In this example, the voltage at the collector C of the PNP transistor Q is the voltage at the base B after being divided by the third voltage divider resistor DR3 and the fourth voltage divider resistor DR4. Therefore, the voltage at the base B of the PNP transistor Q is higher than the voltage at the collector C, and the PNP transistor Q operates in the amplification region. At this time, the PNP transistor Q is turned on, and the current flowing into the emitter E of the PNP transistor Q flows out from the collector C. The current flowing out from the collector C generates a voltage drop through the fourth voltage divider resistor DR4. The third voltage divider resistor DR3 and the fourth voltage divider resistor DR4 divide the voltage across the capacitor voltage VC1 of the supercapacitor C1 to obtain the voltage drop. The feedback voltage VFB can be obtained from these two voltage drops. Specifically, the feedback voltage VFB can be obtained from formula (3):

[0129] Wherein, DR3 is the resistance value of the first voltage divider resistor, and DR4 is the resistance value of the second voltage divider resistor. During the charging process, the feedback voltage VFB is constant and equal to the voltage feedback reference voltage of the general-purpose buck controller 1411. For example, when the general-purpose buck controller 1411 uses the TPS54302 model, the feedback voltage VFB = 0.596V; when the general-purpose buck controller 1411 uses the SCT2331 model, the feedback voltage VFB = 0.8V. That is, during the charging process, the feedback voltage VFB is related to the model of the general-purpose buck controller 1411.

[0130] Formula (4) can be obtained from formula (3) above:

[0131] As the charging process proceeds, the capacitor voltage VC1 of the supercapacitor C1 will gradually increase, and the charging current IC will gradually decrease until the capacitor voltage VC1 reaches a preset value, at which point the charging current IC becomes zero, i.e., charging stops. The capacitor voltage VC1 corresponding to the stop of charging can be obtained according to formula (5): V C1 =V FB / DR4*(DR4+DR3) (5)

[0132] In summary, the types of the general-purpose buck controller 1411 and amplification module 1416 in the electronic control system 1 provided in this application embodiment are not limited. That is, the electronic control system 1 in this application does not rely on dedicated chips, has low cost, and offers high flexibility in selection. Specifically, the amplification module 1416 amplifies the voltage on the sampling module 1415 to obtain the amplified voltage VAO, which is then fed back to the general-purpose buck controller 1411 in real time. This allows the general-purpose buck controller 1411 to control the charging current IC and know the charging status in real time. When the capacitor voltage VC1 rises to a preset value, the charging current IC becomes zero, and the feedback signal FB received by the general-purpose buck controller 1411 indicates that charging has ended at this time. Specifically, the charging current IC can be set by configuring the resistance values ​​of the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the sampling resistor RS. This allows the charging current IC to be controlled within a certain range, preventing it from exceeding the circuit's capacity and causing damage, and also preventing it from being too small, leading to excessively long charging times, thus ensuring the reliability of the charging current IC. The preset value of the capacitor voltage VC1 of the supercapacitor C1 can be set by configuring the resistance values ​​of the third voltage divider resistor DR3 and the fourth voltage divider resistor DR4, providing high flexibility. Furthermore, in this application, the second terminal of the sampling resistor RS is connected to the positive terminal of the supercapacitor C1. Therefore, if the supercapacitor C1 discharges while charging, it will not affect the charging current IC of the charging circuit 141, meaning this application can achieve simultaneous charging and discharging.

[0133] In one example, as shown in Figure 21, the charging circuit 141 may further include a second inductor L2. One end of the second inductor L2 is connected to the output terminal of the general buck controller 1411, and the other end of the second inductor L2 is connected to the first terminal of the sampling resistor RS. In this example, the sampling resistor RS samples the inductor current IL, and the waveform of the sampled inductor current IL is a triangular wave.

[0134] When the sampling resistor RS samples the inductor current IL, since the waveform of the inductor current IL is a triangular wave, the effective value of the current flowing through the sampling resistor RS is relatively large in some intervals, resulting in greater heat loss of the sampling resistor RS. To reduce heat loss, in one example, as shown in Figure 22, the charging circuit 141 can also include a second capacitor C3. The first plate of the second capacitor C3 is connected to the other end of the second inductor L2 and the first end of the sampling resistor RS, and the second plate of the second capacitor C3 is grounded. In this example, the sampling resistor RS samples the average value of the charging current IIC, and the waveform of the average value of the sampled charging current IIC is a flat wave. In this way, the average value of the current flowing through the sampling resistor RS remains unchanged, while the effective value of the current decreases, thereby reducing the heat loss of the sampling resistor RS and avoiding the problem of a large effective value of the current flowing through the sampling resistor RS in some intervals, which leads to greater heat loss of the sampling resistor RS.

[0135] To increase the charging current of the charging circuit 141, thereby improving charging efficiency and reducing charging time, in one example, the backup power circuit 14 may include multiple charging circuits 141. The second terminal of the sampling resistor RS in the multiple charging circuits 141 is connected to the positive terminal of the same supercapacitor C1, as shown in Figure 22. The backup power circuit 14 may include two charging circuits 141. The input terminal of the universal buck controller 1411 in the two charging circuits 141 is connected to the positive terminal of the same DC power supply DC. The base B of the PNP transistor Q and the second terminal of the sampling resistor RS are both connected to the positive terminal of the same supercapacitor C1.

[0136] Thus, the charging current IC generated by the parallel charging of two charging circuits 141 is twice that of a single charging circuit 141, reducing the charging time by half and improving the charging efficiency of the charging circuit 141. The number of parallel charging circuits 141 in the backup power circuit 14 provided in this application is unlimited; that is, the number of parallel charging circuits 141 can be set according to requirements to improve charging efficiency, offering high flexibility. Furthermore, in this application, the second terminal of the sampling resistor RS is connected to the positive terminal of the supercapacitor C1. Therefore, if the supercapacitor C1 discharges while charging, it will not affect the charging current IC of the charging circuit 141, meaning that this application can achieve simultaneous charging and discharging.

[0137] 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 16 so that the discharge circuit 16 can release the electrical energy stored in the energy storage module 142, thereby improving safety during maintenance. However, in the scheme shown in Figure 23, the discharge circuit 16 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 16 on the energy storage module 142, as the discharge circuit 16 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 16 to continuously decrease as well, resulting in a longer discharge time for the discharge circuit 16 on the energy storage module 142.

[0138] To solve the above problems, please refer to Figures 24-25. In some embodiments of this application, the discharge circuit 16 is connected in parallel to the output terminal of the boost circuit 143, and the discharge circuit 16 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 the 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 16 needs to discharge the energy storage module 142, the discharge circuit 16 can be connected to the same output voltage and discharge. At this time, the voltage across the discharge circuit 16 can be the same output voltage, that is, the voltage across the discharge circuit 16 is 12V, so that the discharge power of the discharge circuit 16 will not continue to decrease, thus accelerating the discharge efficiency of the discharge circuit 16 on the energy storage module 142.

[0139] 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 16 is connected to the output voltage and discharges to accelerate the discharge efficiency of the discharge circuit 16 on the energy storage module 142.

[0140] Please refer to Figure 26. In one embodiment, the discharge circuit 16 includes a discharge switch 161 and a discharge load 162. The discharge load 162 is connected in series with the discharge switch 161 to form a series branch. One end of the series branch is connected to the output terminal of the boost circuit 143, and the other end of the series branch is grounded. The discharge load 162 can be a resistor (as shown in Figure 26) or other types of load devices. This application embodiment does not specifically limit this.

[0141] Specifically, when the discharge switch 161 is turned on, the discharge circuit 16 forms a discharge loop and is connected to the output terminal of the boost circuit 143. The energy storage module 142 (e.g., the supercapacitor C1 shown in Figure 24) is connected to the input terminal of the boost circuit 143. That is, the positive voltage of the energy storage module 142 is boosted by the boost circuit 143 to obtain the output voltage. At this time, the output voltage is the same as the preset output voltage of the boost circuit 143, thereby accelerating the consumption of the energy storage module 142 by the discharge load 162. In this way, the discharge efficiency of the discharge circuit 16 to the energy storage module 142 is improved and the discharge time is shortened.

[0142] It should be noted that when the positive voltage of the energy storage module 142 is low, the boost circuit 143 cannot boost the positive voltage of the energy storage module 142. However, as long as the discharge circuit 16 is in the conducting state, the discharge circuit 16 can still discharge the energy storage module 142 until the energy of the energy storage module 142 is reduced to the required level. For example, when the positive voltage of the energy storage module 142 is lower than 0.2V, the discharge switch 161 is turned off to stop discharging the energy storage module 142.

[0143] Please continue to refer to Figure 26. Further, in some embodiments, the discharge switch 161 can be a manual switch or an electronic switch, and the controlled terminal of the electronic switch is connected to the control circuit 11.

[0144] Specifically, the discharge switch 161 can be a manual switch or an electronic switch. When the discharge switch 161 is an electronic switch, the control circuit 11 is electrically connected to the controlled terminal of the electronic switch to control the opening and closing of the electronic switch. This application embodiment does not specifically limit the specific type of the discharge switch 1611.

[0145] For example, when the discharge switch 161 is a manual switch, technicians need to manually operate the discharge switch 161 to turn on the discharge circuit 16, forming a discharge loop. This allows the discharge load 162 to consume the energy of the energy storage module 142, thereby enabling the discharge circuit 16 to discharge the energy storage module 142. When the discharge switch 161 is off, a discharge loop cannot be formed, and therefore, the discharge load 162 cannot consume the energy of the energy storage module 142. Therefore, maintenance personnel can manually operate the discharge switch 161 to perform a boost discharge on the energy storage module 142 when maintenance is required.

[0146] Please refer to Figure 26. In some embodiments, the energy storage module 142 includes one or more supercapacitors C1 or batteries connected in series. The positive terminal of the supercapacitor C1 or battery is connected to the boost circuit 143. It is understood that the energy storage module 142 can be a supercapacitor C1 or a battery. The supercapacitor C1 can be one or multiple supercapacitors C1 connected in series to form a supercapacitor bank. The supercapacitor C1 is a physical energy storage device. The energy storage mechanism of the supercapacitor C1 is mainly based on the storage and release of static charge. The supercapacitor C1 consists of multiple sets of electrodes and electrolytes. It stores and releases charge through the attraction and repulsion of positive and negative charges, thereby storing and releasing energy. The supercapacitor C1 has advantages such as high-efficiency charging and discharging, long service life, low internal resistance, and high energy efficiency. The following explanation uses the supercapacitor C1 as an example for the energy storage module 142.

[0147] In related technologies, when the energy storage module 142 is composed of multiple supercapacitors C1 connected in series to form a supercapacitor bank, since the capacitance of each supercapacitor C1 may be different, during the discharge process of the discharge circuit 16 on the supercapacitor bank, the supercapacitor C1 with smaller capacitance will be affected by negative voltage, which can easily lead to damage of the supercapacitor C1 with smaller capacitance, resulting in a shortened service life of the energy storage module 142.

[0148] To address the aforementioned issues, please refer to Figure 27. In some embodiments, each supercapacitor C1 has a corresponding boost circuit 143 and discharge circuit 16. When the supercapacitor group needs to be discharged, the current of each supercapacitor C1 flows through the corresponding boost circuit 143 and discharge circuit 16, enabling the discharge circuit 16 to boost and discharge the corresponding individual supercapacitor C1. Since the current of each supercapacitor C1 flows through the corresponding boost circuit 143 and discharge circuit 16, the current of supercapacitor C1 will not flow through another supercapacitor C1, thereby preventing negative voltage from appearing in the supercapacitor C1 of the supercapacitor group. This prevents damage to the supercapacitor C1 and extends the service life of the energy storage module 142.

[0149] In some embodiments, referring to FIG24, the charging circuit 141 is configured to charge the energy storage module 142 after discharge. That is, when the technician needs to release the electrical energy of the supercapacitor C1, the discharge switch 161 of the discharge circuit 16 can be turned on to make the discharge circuit 16 conduct, thereby realizing the discharge load 162 to consume the electrical energy of the supercapacitor C1. After consuming the electrical energy of the supercapacitor C1, the charging circuit 141 can be configured to charge the supercapacitor C1 after discharge. After the discharge circuit 16 charges the supercapacitor C1 to a certain value, the charging needs to be stopped so that the energy storage module 142 always stores the set electrical energy. When the rectifier circuit 13 is powered off, the energy storage module 142 in the backup power circuit 14 can supply power to the valve drive circuit 12 and the control circuit 11. In this way, the valve drive circuit 12 can drive the valve assembly 5 to close, thereby preventing refrigerant leakage in the refrigerant circuit 3.

[0150] Referring to Figure 26, in some embodiments, the boost circuit 143 includes a boost inductor L3, a semiconductor switch 1436, a second diode D2, an energy storage capacitor C4, and a boost controller 1431. One end of the boost inductor L3 is connected to the positive terminal of the energy storage module 142, and the other end of the boost inductor L3 is connected to the input terminal of the semiconductor switch 1436 and the anode of the second diode D2. The cathode of the second diode D2 is connected to one end of the energy storage capacitor C4 and serves as the output terminal of the boost circuit 143, which is connected to the discharge circuit 16. The other end of the energy storage capacitor C4 is grounded. The controlled terminal of the semiconductor switch 1436 is connected to the boost controller 1431, and the output terminal of the semiconductor switch 1436 is grounded.

[0151] Specifically, the P-line from the positive terminal of supercapacitor C1 is connected to the boost inductor L3, allowing the current from supercapacitor C1 to flow into the boost circuit 143 via the P-line. The N-line from the negative terminal of supercapacitor C1 is grounded. The boost controller 1431 can control the semiconductor switch 1436 to turn on or off, thereby controlling the boost voltage of the positive terminal of supercapacitor C1. The boost controller 1431 controls the output voltage of the boost circuit 143 by controlling the switching frequency of the semiconductor switch 1436. It should be noted that the semiconductor switch 1436 can be a switching device such as an NMOS transistor, PMOS transistor, triode, or relay, or other switching devices or circuits. This application embodiment does not specifically limit this.

[0152] For example, taking the semiconductor switch 1436 as a PMOS transistor, the gate of the PMOS transistor is connected to the boost controller 1431, the drain of the PMOS transistor is connected to the other end of the boost inductor L3, and the source of the PMOS transistor is grounded. During the charging process of the boost inductor L3, the boost controller 1431 controls the switching frequency of the PMOS transistor by outputting a pulse signal with a certain duty cycle. During the conduction time of the PMOS transistor, the positive voltage of the supercapacitor C1 flows through the boost inductor L3 to charge the boost inductor L3. During the charging process of the boost inductor L3 by the super circuit, the current on the boost inductor L3 increases linearly at a certain rate. As the current of the boost inductor L3 increases, the boost inductor L3 can store a certain amount of electrical energy.

[0153] During the discharge process of the boost inductor L3, the boost controller 1431 can control the PMOS transistor to turn off, and the energy stored in the boost inductor L3 can charge the energy storage capacitor C4 through the second diode D2. The second diode D2 is set to prevent the energy storage capacitor C4 from charging to ground. During the charging process of the boost inductor L3, the voltage across the energy storage capacitor C4 increases. At this time, the voltage across the energy storage capacitor C4 can be higher than the positive voltage of the supercapacitor C1 after being boosted. At the same time, the output terminal of the boost circuit 143 is connected to the discharge circuit 16. That is, the positive voltage of the supercapacitor C1 and the voltage of the boost inductor L3 are superimposed to charge the energy storage capacitor C4. At this time, the boost circuit 143 boosts the energy storage circuit C2 to obtain the boosted output voltage, and the discharge circuit 16 discharges the boosted output voltage. In this way, the discharge efficiency of the discharge circuit 16 on the energy storage module 142 is accelerated.

[0154] Please refer to Figure 28. In some embodiments, the electronic control system 1 further includes a power display circuit 17. The power display circuit 17 is connected to the energy storage module 142 and is configured to display the current power of the energy storage module 142. It can be understood that the power display circuit 17 can be configured to monitor the current power value of the supercapacitor C1. When the discharge circuit 15 discharges the supercapacitor C1, the presence of the power display circuit 17 makes it easy for technicians to observe whether the supercapacitor C1 has finished discharging.

[0155] Optionally, the power display circuit 17 includes multiple parallel LED display circuits (not shown in the figure). The multiple LED display circuits are selectively lit by controlling different positive voltages of the supercapacitor C1. That is, the multiple LED display circuits are connected to the positive terminal of the supercapacitor C1, and the energy storage percentage of the supercapacitor C1 is fixedly related to the voltage of the supercapacitor C1. By reasonably configuring the voltage divider resistor values ​​of the LED display circuits, the energy storage of the supercapacitor C1 in the LED display circuit will be lit when the energy storage of the supercapacitor C1 is at different percentages. For example, when the energy storage of the supercapacitor C1 is 50%, the corresponding LED display circuit will be lit. In this way, it is easy to know the energy storage of the supercapacitor C1.

[0156] In some embodiments, the electronic control system 1 further includes a leak detection sensor connected to the control circuit 11. The control circuit 11 is configured to issue a control valve assembly 5 closing command when the leak detection sensor detects a refrigerant leak in the refrigerant circuit 3. It is understood that the leak detection sensor is configured to detect whether there is a refrigerant leak in the refrigerant circuit 3. When the leak detection sensor detects a refrigerant leak in the refrigerant circuit 3, it can send a leak detection signal to the control circuit 11. Based on the received leak detection signal, the control circuit 11 issues a control valve assembly 5 closing command to the valve drive circuit 12 to prevent refrigerant from leaking into the indoor environment, thereby improving the safety of the HVAC system 6. It is understood that, in addition to closing the valve assembly 5 when there is a refrigerant leak, as mentioned above, when the rectifier circuit 13 loses power, the backup power circuit 14 will supply power to the control circuit 11 and the valve drive circuit 12 to close the valve assembly 5.

[0157] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only set as exemplary illustrations and should not be construed as limitations on this application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0158] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An electric control system of a heating, ventilation, and air conditioning system, wherein, The heating system comprises a refrigerant circuit provided with a valve assembly, the electric control system comprises: a valve driving circuit connected with the valve assembly and configured to drive the valve assembly to act; a control circuit connected with the valve driving circuit and configured to control the valve driving circuit; a rectifier circuit connected with the valve driving circuit and the control circuit and 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; and a backup power supply circuit connected with the valve driving circuit, the control circuit and the rectifier circuit and configured to supply power to the valve driving circuit and the control circuit when power of the rectifier circuit is cut off.

2. The electrical control system of claim 1, wherein, The backup power supply circuit comprises a charging circuit, an energy storage module and a voltage boosting circuit connected in sequence, the control circuit is further connected with the charging circuit and the voltage boosting circuit, the charging circuit is connected with the rectifier circuit and the energy storage module respectively, the voltage boosting circuit is connected with the valve driving circuit and configured to supply power to the valve driving circuit and the control circuit when power of the rectifier circuit is cut off; The voltage boosting circuit comprises: a voltage boosting control module comprising a voltage boosting controller, an output end of which is connected with a positive electrode of the energy storage module; a voltage boosting enable module, a first end of which is connected with an output end of the voltage boosting controller, a second end of which is connected with an enable end of the voltage boosting controller, and a third end of which is grounded; a voltage boosting feedback module, a first end of which is connected with an output end of the voltage boosting controller, a second end of which is connected with a feedback end of the voltage boosting controller, and a third end of which is grounded; and an output voltage adjusting module, a first end of which is connected with a first end of the voltage boosting feedback module, a second end of which is connected with an output end of the control circuit, and a third end of which is connected with a second end of the voltage boosting feedback module, the output voltage adjusting module being configured to adjust voltage fed back to the feedback end of the voltage boosting feedback module.

3. The electrical control system of claim 2, wherein, The voltage boosting feedback module comprises: a first voltage dividing resistor, one end of which is connected with the output end of the voltage boosting controller and the first end of the output voltage adjusting module, and the other end of which is connected with the third end of the output voltage adjusting module and the feedback end of the voltage boosting controller at a first node; and a second voltage dividing resistor, one end of which is connected at the first node, and the other end of which is grounded.

4. The electric control system of claim 3, wherein, The output voltage adjusting module comprises a first resistor, a second resistor, a third resistor, a first switch tube and a second switch tube; one end of the first resistor is connected with one end of the first voltage dividing resistor and a first end of the first switch tube, the other end of the first resistor is connected with one end of the second resistor and a controlled end of the first switch tube, the other end of the second resistor is connected with a first end of the second switch tube, a controlled end of the second switch tube is connected with the output end of the control circuit, a second end of the second switch tube is grounded, a second end of the first switch tube is connected with one end of the third resistor, and the other end of the third resistor is connected with the first node. When the rectifier circuit is powered off, the control circuit is configured to send a first control signal to the second switch tube, so that the first switch tube and the second switch tube are turned on, and the first voltage dividing resistor and the third resistor are connected in parallel.

5. The electrical control system of claim 3, wherein, The output voltage adjustment module comprises a fourth resistor, a fifth resistor, a third switch tube, and a fourth switch tube. One end of the fourth resistor is connected with one end of the first voltage dividing resistor and one end of the fifth resistor, the other end of the fourth resistor is connected with a first end of the third switch tube, the other end of the fifth resistor is connected with a controlled end of the third switch tube and a first end of the fourth switch tube, a second end of the third switch tube is connected with the first node, a controlled end of the fourth switch tube is connected with an output end of the control circuit, and a second end of the fourth switch tube is grounded. When the rectifier circuit is powered off, the control circuit is configured to send a second control signal to the fourth switch tube, so that the third switch tube and the fourth switch tube are turned on, and the first voltage dividing resistor and the fourth resistor are connected in parallel.

6. The electrical control system of claim 2, wherein, The boost enable module comprises: a sixth resistor, one end of which is connected with an output end of the boost controller; and a stabilizing diode, a negative electrode of which is connected with the other end of the sixth resistor and an enable end of the boost controller, and a positive electrode of which is grounded.

7. The electric control system of claim 2, wherein, The electronic control system further comprises: a step-down circuit, one end of which is connected with a first end of the output voltage adjustment module, and the other end of which is connected with an input end of the control circuit.

8. The electrical control system of claim 7, wherein, The boost control module further comprises a first inductor, a fifth switch tube, a first diode, and a first capacitor. One end of the first inductor is connected with a positive electrode of the energy storage module, the other end of the first inductor is connected with a first end of the fifth switch tube and a positive electrode of the first diode, a second end of the fifth switch tube is grounded, a controlled end of the fifth switch tube is connected with an output end of the boost controller, a negative electrode of the first diode is connected with a first pole plate of the first capacitor, a first end of the boost enable module, a first end of the boost feedback module, and a first end of the output voltage adjustment module, and a second pole plate of the first capacitor is grounded.

9. The electric control system according to any one of claims 1 to 8, wherein The backup power supply circuit comprises a charging circuit, an energy storage module, and a boost circuit connected in sequence, the control circuit is further connected with the charging circuit and the boost circuit, the charging circuit is connected with the rectifier circuit and the energy storage module respectively, the boost circuit is connected with the valve drive circuit, and is configured to supply power to the valve drive circuit and the control circuit when the rectifier circuit is powered off. The charging circuit comprises: a general boost controller, an input end of which is connected with one output of the rectifier circuit; a sampling module, a first end of which is connected with an output end of the general boost controller, and a second end of which is connected with a positive electrode of the energy storage module; an amplifying module, a first input end of which is connected with the first end of the sampling module, and a second input end of which is connected with the second end of the sampling module; and a second diode, a negative electrode of which is connected with the other end of the sixth resistor and the enable end of the boost controller, and a positive electrode of which is grounded. A voltage reduction feedback module, an input end of which is connected with an output end of the amplification module, a controlled end of which is connected with a second end of the sampling module, and an output end of which is connected with a feedback end of the general voltage reduction controller.

10. The electrical control system of claim 9, wherein, The amplification module comprises: A seventh resistor, one end of which is connected with the second end of the sampling module; A general amplifier, a same-phase input end of which is connected with the first end of the sampling module, an opposite-phase input end of which is connected with the other end of the seventh resistor, and an output end of which is connected with the input end of the voltage reduction feedback module; and An eighth resistor, one end of which is connected with the opposite-phase input end of the general amplifier, and the other end of which is connected with the output end of the general amplifier.

11. The electrical control system of claim 10, wherein, The charging circuit further comprises: A ninth resistor, one end of which is connected with the output end of the general amplifier, and the other end of which is connected with the input end of the voltage reduction feedback module.

12. The electrical control system of claim 9, wherein, The voltage reduction feedback module comprises: A triode, a first end of which is connected with the output end of the amplification module, a controlled end of which is connected with the second end of the sampling module, and a second end of which is connected with the feedback end of the general voltage reduction controller; A third voltage division resistor, one end of which is connected with the output end of the general voltage reduction controller, and the other end of which is connected with the output end of the triode at a second node; and A fourth voltage division resistor, one end of which is connected at the second node, and the other end of which is grounded.

13. The electrical control system of claim 9, wherein, The sampling module comprises: A sampling resistor, one end of which is connected with the output end of the general voltage reduction controller and a first input end of the amplification module, and the other end of which is connected with a second input end of the amplification module and a positive electrode of the energy storage module.

14. The electric control system of claim 9, wherein, The charging circuit further comprises: A second inductor, one end of which is connected with the output end of the general voltage reduction controller, and the other end of which is connected with the first end of the sampling module; The sampling module is configured to collect an inductor current, and a waveform of the inductor current is a triangular wave.

15. The electrical control system of claim 14, wherein, The charging circuit further comprises: A second capacitor, a first plate of which is connected with the other end of the second inductor and the first end of the sampling module, and a second plate of which is grounded; The sampling module is configured to collect an average value of a charging current, and a waveform of the average value of the charging current is a flat wave.

16. The electric control system according to any one of claims 9 to 15, wherein, The standby power supply circuit comprises a plurality of the charging circuits, and the second ends of the plurality of sampling modules are all connected with the positive electrode of the same energy storage module.

17. The electrical control system of any one of claims 9 to 15, wherein, The output of the rectifier circuit is divided into two paths, one of which is connected with the valve drive circuit and the control circuit, and is configured to rectify alternating current into direct current and supply power to the valve drive circuit and the control circuit when there is no power outage; the other of which is connected with the charging circuit, so as to charge the energy storage module through the charging circuit.

18. The electrical control system of claim 9, wherein, The electric control system further comprises: A discharging circuit, which is connected in parallel with the output end of the voltage boosting circuit, and is configured to discharge the voltage boosting circuit after the voltage boosting circuit boosts the voltage of the positive electrode of the energy storage module.

19. The electric control system of claim 18, wherein, The discharging circuit comprises: A discharging switch; and A discharging load, which is connected in series with the discharging switch to form a series branch, one end of the series branch being connected with the output end of the voltage boosting circuit, and the other end of the series branch being grounded. The discharging circuit comprises: A discharging switch; and A discharging load, which is connected in series with the discharging switch to form a series branch, one end of the series branch being connected with the output end of the voltage boosting circuit, and the other end of the series branch being grounded. The discharge switch is a manual switch, or the discharge switch is an electronic switch, and a controlled end of the electronic switch is connected with the control circuit.

20. The electric control system of claim 19, wherein, The boost circuit comprises a boost inductor, a semiconductor switch, a second diode, an energy storage capacitor and a boost controller; 21. The electric control system of claim 18, wherein, One end of the boost inductor is connected with a positive pole of the energy storage module, and the other end of the boost inductor is connected with an input end of the semiconductor switch and an anode of the second diode; A cathode of the second diode is connected with one end of the energy storage capacitor, and the energy storage capacitor is connected with the discharge circuit as an output end of the boost circuit; the other end of the energy storage capacitor is grounded; A controlled end of the semiconductor switch is connected with the boost controller, and an output end is grounded. The energy storage module comprises one or more supercapacitors or batteries connected in series, and positive poles of the supercapacitors or batteries are connected with the boost circuit.

22. The electric control system of claim 18, wherein, The charging circuit is configured to charge the energy storage module after discharge.

23. The electronic control system according to claim 18, wherein, The backup power supply circuit comprises the charging circuit, the energy storage module and the boost circuit connected in sequence, the control circuit is further connected with the charging circuit and the boost circuit, the charging circuit is connected with the rectifier circuit and the energy storage module respectively, the boost circuit is connected with the valve driving circuit, and the charging circuit is configured to supply power to the valve driving circuit and the control circuit when the rectifier circuit is powered off; 24. The electrical control system of any one of claims 1 to 23, wherein, The electric control system further comprises: The electric quantity display circuit is connected with the energy storage module and is configured to display the current electric quantity of the energy storage module. The electric quantity display circuit comprises a plurality of lamp bead display circuits connected in parallel, and the plurality of lamp bead display circuits are controlled to be selectively lit by different positive pole voltages of the energy storage module.

25. The electric control system of claim 24, wherein, The electric control system further comprises:

26. The electrical control system of any one of claims 1 to 25, wherein, The leak detection sensor is connected with the control circuit, and the control circuit is configured to send a valve assembly closing instruction when the leak detection sensor detects refrigerant leakage in the refrigerant circuit. The backup power supply circuit and the valve driving circuit share one rectifier circuit.

27. The electrical control system of any one of claims 1 to 26, wherein, The electric control system comprises:

28. A heating and ventilation system wherein, An outdoor unit; A refrigerant circuit connected with the outdoor unit; An indoor unit connected with the outdoor unit through the refrigerant circuit A valve assembly arranged on the refrigerant circuit; and The valve driving circuit is connected with the valve assembly. The electric control system according to any one of claims 1 to 27, wherein the valve driving circuit is connected with the valve assembly.

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