Low-frequency operation control method of air conditioner and air conditioner

Abstract

The low-frequency operation control method of the air conditioner comprises the steps that if a first instruction is received, an outdoor unit mainboard is controlled to switch a half-wave rectification circuit unit to operate, and the current environment temperature and the current operation parameters of an indoor unit load are recorded; and the indoor unit load is controlled to operate according to the current operation parameters, and the current environment temperature serves as the target temperature to control the outdoor unit load to operate. According to the method, the outdoor unit mainboard is controlled to switch the half-wave rectification circuit unit to operate by receiving the first instruction, the current environment temperature and the current operation parameters of the indoor unit load are recorded, the indoor unit load is controlled to operate according to the current operation parameters, and the outdoor unit load is controlled to operate with the current environment temperature as the target temperature. The air conditioner can keep low power during low-frequency operation in the time period with the low refrigeration or heating requirement, energy consumption is reduced, and the overall energy efficiency of the air conditioner is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of air conditioners, and in particular to a low-frequency operation control method of an air conditioner and an air conditioner. Background Art

[0002] At present, the development of household variable frequency air conditioners has been very mature, and how to pursue the ultimate energy efficiency of air conditioners has always been the goal pursued by all manufacturers. The energy loss of existing air conditioners is reflected in the loss of indoor units and outdoor units, and the loss of outdoor units mainly includes the loss of compressors, outdoor fans, and outdoor unit mainboards. In the outdoor units of current air conditioners, the outdoor unit mainboards mostly use Boost PFC circuits for full-wave rectification output. However, when the air conditioner is running, the Boost PFC circuit on the outdoor unit mainboard performs full-wave rectification output at various times when the air conditioner is running, and the overall energy consumption of the circuit is high. Even if the air conditioner is running at a low frequency during a period when the cooling or heating requirements are not high, the circuit will still consume more energy, making the overall energy efficiency of the air conditioner low and the energy saving effect is not ideal. Summary of the invention

[0003] The present invention provides a low-frequency operation control method of an air conditioner and an air conditioner, aiming to solve the problem of low energy efficiency of the air conditioner caused by high energy consumption of a PFC circuit when the air conditioner is running in various time periods.

[0004] In the first aspect, the present invention also provides a low-frequency operation control method for an air conditioner, the method comprising: if a first instruction is received, controlling the outdoor unit mainboard to switch the half-wave rectifier circuit unit to operate, and recording the current ambient temperature and the current operating parameters of the indoor unit load; controlling the indoor unit load to operate with the current operating parameters, and controlling the outdoor unit load to operate with the current ambient temperature as the target temperature.

[0005] In a second aspect, an embodiment of the present invention provides an air conditioner, comprising: an indoor unit; an outdoor unit connected to the indoor unit; an outdoor unit mainboard, arranged in the outdoor unit, comprising a Boost PFC circuit unit, a half-wave rectifier circuit unit and a switching unit, the Boost PFC circuit unit being connected to the half-wave rectifier circuit unit, and the switching unit connecting the Boost PFC circuit unit and the half-wave rectifier circuit unit; wherein the switching unit is used to switch the operation of the Boost PFC circuit unit and the half-wave rectifier circuit unit with each other, so that one of the Boost PFC circuit unit and the half-wave rectifier circuit unit is running and the other is stopped.

[0006] Furthermore, the BoostPFC circuit unit includes a rectifier bridge and a Boost boost circuit, the half-wave rectifier circuit unit includes a thyristor, the input end of the Boost boost circuit is connected to the output end of the rectifier bridge, the anode of the thyristor is connected to an input end of the rectifier bridge, and the cathode is connected to the output end of the Boost boost circuit, and the switching unit is connected between the input end and the output end of the rectifier bridge, wherein the switching unit is used to switch so that a loop is formed between the input end and the output end of only one of the rectifier bridge and the thyristor.

[0007] Furthermore, the Boost circuit includes a power inductor, a power diode and a power switch tube, one end of the power inductor is connected to an output end of the rectifier bridge, and the other end is connected to the anode of the power diode and the drain of the power switch tube, the source of the power switch tube is connected to the other output end of the rectifier bridge, and the cathode of the power diode is connected to the cathode of the thyristor.

[0008] Further, the switching unit includes a first switch and a second switch, one end of the first switch is connected to the input end of the rectifier bridge, and the other end is connected to one end of the second switch and is used for AC input, and the other end of the second switch is connected to the output end of the rectifier bridge, wherein the first switch and the second switch are used to disconnect when one of them is closed.

[0009] Furthermore, the switching unit further includes a resonant capacitor and a resonant inductor, the resonant capacitor is connected in parallel to both ends of the first switch and / or the second switch, and the resonant inductor is connected in series to one end of the first switch and / or the second switch.

[0010] The present invention provides a low-frequency operation control method of an air conditioner and an air conditioner, wherein the method comprises: if a first instruction is received, controlling the outdoor unit mainboard to switch the half-wave rectifier circuit unit to operate, and recording the current ambient temperature and the current operating parameters of the indoor unit load; controlling the indoor unit load to operate with the current operating parameters, and controlling the outdoor unit load to operate with the current ambient temperature as the target temperature. The method of the present application controls the outdoor unit mainboard to switch the half-wave rectifier circuit unit to operate by receiving a first instruction, and records the current ambient temperature and the current operating parameters of the indoor unit load, controls the indoor unit load to operate with the current operating parameters, and controls the outdoor unit load to operate with the current ambient temperature as the target temperature. During the period when the user does not have high requirements for cooling or heating, the air conditioner can maintain a lower power when operating at a low frequency, reducing energy consumption, thereby improving the overall energy efficiency of the air conditioner. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0012] Figure 1 is a simplified structural diagram of an air conditioner according to an embodiment of the present invention;

[0013] Figure 2 It is a partial circuit diagram of the mainboard of the external unit according to the embodiment of the present invention;

[0014] Figure 3 A schematic flow chart of the steps of a low-frequency operation control method for an air conditioner according to an embodiment of the present invention;

[0015] Figure 4 1 is a schematic diagram of the sub-step flow of the low-frequency operation control method of the air conditioner according to the embodiment of the present invention;

[0016] Figure 5 1 is a schematic diagram of the sub-step flow of the low-frequency operation control method of the air conditioner according to the embodiment of the present invention;

[0017] Reference numerals:

[0018] 100, outdoor unit; 200, indoor unit; 5, outdoor unit mainboard; 10, Boost PFC circuit unit; 11, rectifier bridge; 12, Boost voltage-boosting circuit; 20, half-wave rectifier circuit unit; 30, switching unit. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0021] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0022] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0023] As used in this specification and the appended claims, the term "if" may be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if [described condition or event] is detected" may be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0024] In order to facilitate understanding of the present invention, the air conditioner provided by the embodiment of the present invention is first described. Figure 1 and Figure 2 An embodiment of the present invention provides an air conditioner, comprising: an indoor unit 200; an outdoor unit 100, connected to the indoor unit 200; an outdoor unit mainboard 5, arranged in the outdoor unit 100, comprising a Boost PFC circuit unit 10, a half-wave rectifier circuit unit 20 and a switching unit 30, wherein the Boost PFC circuit unit 10 is connected to the half-wave rectifier circuit unit 20, and the switching unit 30 connects the Boost PFC circuit unit 10 and the half-wave rectifier circuit unit 20; wherein the switching unit 30 is used to switch the Boost PFC circuit unit 10 and the half-wave rectifier circuit unit 20 to operate mutually, so that one of the Boost PFC circuit unit 10 and the half-wave rectifier circuit unit 20 is operated and the other is stopped.

[0025] In this embodiment, the outdoor unit of a conventional air conditioner mostly uses a Boost PFC circuit for full-wave rectification output. Even when the air conditioner operates at a low frequency during periods of low cooling or heating requirements, the Boost PFC circuit will consume more energy, resulting in lower overall energy efficiency of the air conditioner.

[0026] To this end, the present embodiment provides an air conditioner in which the outdoor unit 100 of the air conditioner has an outdoor unit main board 5 that can switch between full-wave rectification and half-wave rectification, so that during a period when the user does not have high requirements for cooling or heating, the outdoor unit 100 has an outdoor unit main board 5 that can switch to half-wave rectification output, thereby reducing energy consumption and improving the energy efficiency of the air conditioner.

[0027] The air conditioner of this embodiment includes an indoor unit 200, an outdoor unit 100 and an external unit mainboard 5. The indoor unit 200 is the part of the air conditioner used for indoor operation. The indoor unit 200 is mainly composed of a shell, an evaporator, an internal fan, a windshield, a controller and other parts. It is mainly used to circulate and filter indoor air, transport refrigerated or heated air, and transfer and convert energy. The outdoor unit 100 is the part of the air conditioner used for outdoor operation. The outdoor unit 100 is connected to the indoor unit 200. The outdoor unit 100 is mainly composed of a shell, an external unit mainboard 5, a compressor, a condenser, an electronic expansion valve, an external fan and other parts. It is mainly used to dissipate heat and cooperate with the indoor unit 200 to complete refrigeration or heating. The external mainboard 5 is integrally arranged in the outdoor unit 100, and is connected to the controller of the indoor unit 200. The external mainboard 5 is a key component for controlling the operation of the compressor, the outdoor fan and other components of the outdoor unit 100. Specifically, the external mainboard 5 integrates the Boost PFC circuit unit 10, the half-wave rectifier circuit unit 20 and the switching unit 30, and other circuit units are also integrated. The Boost PFC circuit unit 10 is connected to the half-wave rectifier circuit unit 20, and the switching unit 30 connects the Boost PFC circuit unit 10 and the half-wave rectifier circuit unit 20. The Boost PFC circuit unit 10 is specifically a Boost PFC circuit, which is a PFC circuit that combines full-wave rectification function and boost function. The Boost PFC circuit unit 10 can perform full-wave rectification output, specifically rectifying the positive half-cycle and negative half-cycle of the AC power. No matter which half-cycle the AC power is in, current passes through the load to form a continuous DC output; and the half-wave rectification circuit unit 20 is used for half-wave rectification, which is specifically a half-wave rectification circuit. The half-wave rectification circuit unit 20 can convert half a cycle (positive half cycle or negative half cycle) of the input AC power into DC power, and the current in the other half cycle is blocked, allowing only the current of the half cycle of the AC power to pass in one direction. The switching unit 30 is connected to the Boost PFC circuit unit 10 and the half-wave rectifier circuit unit 20. The switching unit 30 is used to switch the Boost PFC circuit unit 10 and the half-wave rectifier circuit unit 20 to operate mutually, so that one of the Boost PFC circuit unit 10 and the half-wave rectifier circuit unit 20 operates and the other stops. Specifically, in the default state, the control system of the air conditioner controls the switching unit 30 to switch to the Boost PFC circuit unit 10 to operate, the external mainboard 5 of the outdoor unit 100 is in the full-wave rectifier operation state, and the half-wave rectifier circuit unit 20 stops operating. When the control system of the air conditioner controls the switching unit 30 to switch to the half-wave rectifier circuit unit 20 to operate, the Boost PFC circuit unit 10 of the external mainboard 5 of the outdoor unit 100 stops operating, and the external mainboard 5 is in the half-wave rectifier operation state.Compared with the full-wave rectification mode of the Boost PFC circuit unit 10, the half-wave rectification mode of the half-wave rectification circuit unit 20 has a relatively low efficiency, but consumes less energy during operation, while the Boost PFC circuit unit 10 has a high efficiency, but consumes a high amount of energy during operation, so when the switching unit 30 switches to the half-wave rectification circuit unit 20 for operation, the energy consumed by the external mainboard 5 as a whole is relatively small. In general, the switching unit 30 can select and switch between the Boost PFC circuit unit 10 and the half-wave rectification circuit unit 20. Specifically, the switching unit 30 switches to the Boost PFC circuit unit 10 for full-wave rectification output, which is suitable for the period when the air conditioner has high requirements for cooling or heating, such as the period when the ambient temperature is high during the day. And the switching unit 30 switches to the half-wave rectification circuit unit 20 for half-wave rectification output, which is suitable for the period when the air conditioner has low requirements for cooling or heating, such as the period when the ambient working conditions are relatively light at night. The outdoor main board 5 in the air conditioner outdoor unit 100 can control the switching unit 30 to switch to a suitable mode according to the demand for cooling or heating under environmental conditions through the switching unit 30. During the period when the demand for cooling or heating is not high, switching to the half-wave rectifier circuit unit 20 for operation can reduce the overall energy consumption of the outdoor main board 5. Compared with traditional air conditioners, the air conditioner of the present application has higher energy efficiency.

[0028] Through this embodiment, the external unit main board can switch between full-wave rectification and half-wave rectification, so that during periods when the user does not have high requirements for cooling or heating, the main board of the outdoor unit can switch from full-wave rectification to half-wave rectification, thereby reducing energy consumption and improving air conditioning energy efficiency.

[0029] In one embodiment, referring to Figure 2 The Boost PFC circuit unit 10 includes a rectifier bridge 11 and a Boost boost circuit 12. The half-wave rectifier circuit unit 20 includes a thyristor VT1. The input end of the Boost boost circuit 12 is connected to the output end of the rectifier bridge 11. The anode of the thyristor VT1 is connected to an input end of the rectifier bridge 11, and the cathode is connected to the output end of the Boost boost circuit 12. The switching unit 30 is connected between the input end and the output end of the rectifier bridge 11, wherein the switching unit 30 is used to switch so that a loop is formed between the input end and the output end of only one of the rectifier bridge 11 and the thyristor 12. In a specific implementation, the Boost PFC circuit unit 10 is mainly composed of a rectifier bridge 11 and a Boost boost circuit 12. The rectifier bridge 11 is specifically composed of four diodes, such as Figure 1As shown, the rectifier bridge 11 is composed of four diodes D1 to D4, forming four bridge arms, of which two bridge arms serve as the positive and negative input ends of the alternating current, and the other two bridge arms serve as the positive and negative output ends. The input end of the Boost boost circuit 12 is connected to the output end of the rectifier bridge 11 to increase the output voltage of the rectifier bridge 11. The output end of the Boost boost circuit 12 is connected to the load for use. The Boost boost circuit 12 is specifically designed with power devices such as inductors, diodes, and switching tubes. The energy consumed by the Boost boost circuit 12 during operation is relatively high, occupying most of the overall energy consumption of the Boost PFC circuit unit 10. The half-wave rectifier circuit unit 20 is composed of a thyristor VT1, which is a four-layer semiconductor device with three PN junctions, usually composed of a PNPN structure, and has the characteristics of high power, high voltage, and high current. The anode of thyristor VT1 is used as the input terminal, and the cathode is used as the output terminal. The anode of thyristor VT1 is connected to one of the input terminals of rectifier bridge 11, specifically connected to the positive input terminal of rectifier bridge 11, and the cathode of thyristor VT1 is connected to the output terminal of Boost boost circuit 12, specifically connected to the positive output terminal of Boost boost circuit 12. Thyristor VT1 can output the corresponding half-wave rectified waveform according to the half-wave rectification principle, so that the load end obtains the voltage after half-wave rectification. Specifically, the conduction trigger angle in each positive half cycle is set to 0°, that is, the gate trigger pulse is applied to thyristor VT1 at the beginning of each positive half cycle, and thyristor VT1 is turned on. Due to the unidirectional conductivity of the thyristor, when the input voltage reaches the negative half cycle, the thyristor is turned off due to the negative pressure. At this moment, the whole circuit is turned on in the positive half cycle, and the output is a single pulse waveform in each cycle. The switching unit 30 is connected to one of the input ends and one of the output ends of the rectifier bridge 11. In actual applications, the switching unit 30 is used to switch so that a loop is formed between the input end and the output end of only one of the rectifier bridge 11 and the thyristor. When the switching unit 30 switches the input end and the output end of the rectifier bridge 11 to form a loop, the rectifier bridge 11 works normally for full-wave rectification output, and at the same time, the Boost boost circuit 12 after the rectifier bridge 11 also works normally to achieve high-efficiency full-wave rectification output. At this time, the input end and the output end of the thyristor VT1 do not form a loop, the thyristor VT1 stops working, and only the branch where the rectifier bridge 11 and the Boost boost circuit 12 are located works normally. When the switching unit 30 switches the input and output ends of the thyristor VT1 to form a loop, the branch where the rectifier bridge 11 and the Boost boost circuit 12 are located is short-circuited by the thyristor VT1 spanning the input end of the rectifier bridge 11 and the output end of the Boost boost circuit 12, and the rectifier bridge 11 and the Boost boost circuit 12 both stop working, and only the thyristor VT1 works normally to perform half-wave rectification output.

[0030] Further, refer to Figure 2The Boost circuit 11 includes a power inductor L, a power diode D5 and a power switch tube V. One end of the power inductor L is connected to an output end of the rectifier bridge 11, and the other end is connected to the anode of the power diode D5 and the drain of the power switch tube V. The source of the power switch tube V is connected to the other output end of the rectifier bridge 11, and the cathode of the power diode D5 is connected to the cathode of the thyristor VT1. In a specific implementation, Figure 2 As shown, the Boost circuit 12 is composed of a power inductor L, a power switch tube V and a power diode D5. One end of the power inductor L is connected to an output end of the rectifier bridge 11, and the other end is connected to the anode of the power diode D5 and the drain of the power switch tube V. The source of the power switch tube V is connected to the other output end of the rectifier bridge 11, and the cathode of the thyristor VT1 is connected to the cathode of the power diode D5. In practical applications, when the switching unit 30 switches the input end and the output end of the rectifier bridge 11 to form a loop, the rectifier bridge 11 works normally to perform full-wave rectification output, and the Boost circuit 12 after the rectifier bridge 11 works normally at the same time. The power switch tube V is periodically switched to charge and discharge the power inductor L, and finally the voltage across the capacitor in the circuit is increased, and the DC voltage output by the rectifier bridge 11 is increased to the input voltage required by the load, so as to improve the power factor of the circuit. When the switching unit 30 switches the input and output ends of the thyristor VT1 to form a loop, the branch where the rectifier bridge 11 and the Boost boost circuit 12 are located is short-circuited by the thyristor VT1 spanning the input end of the rectifier bridge 11 and the output end of the Boost boost circuit 12, and the rectifier bridge 11 and the Boost boost circuit 12 both stop working, the power inductor L and the power diode D5 are bypassed, and the power devices with higher energy consumption in the Boost boost circuit 12 no longer consume power. At the same time, the thyristor VT1 replaces the rectifier bridge 11 to perform half-wave rectification output, so that the power consumption of the entire circuit is reduced to a minimum, thereby achieving the effect of improving the energy efficiency of the system.

[0031] Further, refer to Figure 2, the switching unit 30 includes a first switch S1 and a second switch S2, one end of the first switch S1 is connected to the input end of the rectifier bridge 11, the other end of the first switch S1 is connected to one end of the second switch S2 and is used for AC input, and the other end of the second switch S2 is connected to the output end of the rectifier bridge 11, wherein the first switch S1 and the second switch S2 are used to disconnect when one of them is closed. In a specific implementation, the switching unit 30 is composed of a first switch S1 and a second switch S2, both of which are electronically controlled switch types, and the two ends are input and output ends respectively, and have a control end, one end of the first switch S1 is connected to one of the input ends of the rectifier bridge 11, specifically connected to the negative input end of the rectifier bridge 11, and the other end of the first switch S1 is connected to one end of the second switch S2 and serves as the input end of the alternating current, that is, the ends connected to the first switch S1 and the second switch S2 are jointly used as an input port of the alternating current, and the input end of the rectifier bridge 11 connected to the anode of the thyristor VT1 is directly used as another input port of the alternating current. The other end of the second switch S2 is connected to the output end of the rectifier bridge 11, and is also connected to the input end of the Boost circuit 12. The first switch S1 and the second switch S2 are synchronous switches. In actual control, when one of the first switch S1 and the second switch S2 is closed, the other is open, that is, when the first switch S1 is closed, the second switch S2 is open, and when the second switch S2 is closed, the first switch S1 is open. Specifically, when the first switch S1 is closed and the second switch S2 is disconnected, the input and output ends of the rectifier bridge 11 form a loop, the rectifier bridge 11 and the Boost boost circuit 12 work normally, and the rectifier bridge 11 and the Boost boost circuit 12 cooperate to perform efficient full-wave rectification output, and the thyristor VT1 does not work because the input and output ends do not form a loop; on the contrary, when the second switch S2 is closed and the first switch S1 is disconnected, the input and output ends of the thyristor VT1 can form a loop, and the thyristor VT1 works normally to perform half-wave rectification output, and at this time, both the rectifier bridge 11 and the Boost boost circuit 12 are short-circuited by the thyristor VT1, and neither the rectifier bridge 11 nor the Boost boost circuit 12 work, and the rectifier bridge 11 as a whole and the power devices in the Boost boost circuit 12 do not consume power.In general, when the first switch S1 is closed and the second switch S2 is disconnected, the circuit as a whole outputs full-wave rectification, and when the second switch S2 is closed and the first switch S1 is disconnected, the circuit as a whole outputs half-wave rectification. Therefore, the external main board 5 can be switched between full-wave rectification and half-wave rectification at will by simply controlling the synchronous on-off state of the first switch S1 and the second switch S2. The external main board 5 can be switched to half-wave rectification operation during the corresponding period when the cooling or heating requirements are not high according to demand, which can not only meet the basic usage needs of users, but also reduce the high power consumption of the full-wave rectification of the circuit, thereby improving the energy efficiency of the air conditioner.

[0032] Furthermore, refer to Figure 2 , the switching unit 30 also includes a resonant capacitor and a resonant inductor, the resonant capacitor is connected in parallel to both ends of the first switch S1 and / or the second switch S2, and the resonant inductor is connected in series to one end of the first switch S1 and / or the second switch S2. In a specific implementation, the switching unit 30 also includes a resonant capacitor and a resonant inductor, the resonant capacitor is connected in parallel to both ends of the first switch S1 and / or the second switch S2, and the resonant inductor is connected in series to one end of the first switch S1 and / or the second switch S2. Specifically, the resonant capacitor can be connected in parallel to both ends of the first switch S1, or to both ends of the second switch S2, and the resonant inductor can be connected in series to one end of the first switch S1, or to one end of the second switch S2. In practical applications, when the first switch S1 and the second switch S2 are closed or opened, current shocks will be generated, and spike noise will be generated at the time of switching. The resonant capacitor and the resonant inductor can effectively absorb the spike noise of the first switch S1 and the second switch S2 when switching, avoid undesirable resonance, and reduce circuit losses.

[0033] See also Figure 3 , Figure 3 The following is a flowchart of the steps of the low-frequency operation control method of the air conditioner provided in the embodiment of the present invention. The air conditioner applied to the above embodiment has been described in detail in the above embodiment. For the sake of brevity of the specification, it will not be repeated here. The low-frequency operation control method of the air conditioner is described in detail below. Figure 3 As shown, the method includes the following steps: S110-S130.

[0034] S110: If the first instruction is received, the outdoor unit mainboard is controlled to switch the half-wave rectifier circuit unit to operate, and the current ambient temperature and the current operating parameters of the indoor unit load are recorded.

[0035] In the specific implementation, the first instruction includes but is not limited to a button instruction and a voice instruction. The user can send the first instruction to the controller system of the air conditioner through a remote controller, a wire controller, a mobile phone APP, etc. After the air conditioner system is turned on, if the first instruction is not received, the air conditioner system defaults to control the switching unit to switch to the Boost PFC circuit unit to run. At this time, the outdoor unit mainboard defaults to the full-wave rectification output by the Boost PFC circuit unit, which can maintain high-power output to maintain the normal cooling or heating needs of the user. After the air conditioner system receives the first instruction, the air conditioner system switches from the Boost PFC circuit unit to the half-wave rectification circuit unit by controlling the switching unit of the outdoor mainboard, and the Boost PFC circuit unit stops working. At this time, the outdoor mainboard is half-wave rectified by the half-wave rectification circuit unit. The output power is much lower than when the Boost PFC circuit unit is running. Although the output power is low, it can still meet the user's most basic cooling or heating needs, and the consumption of electric energy is reduced. In a certain period of operation after the air conditioner is turned on, when the air conditioner system receives the first instruction, it will record the current ambient temperature and the current operating parameters of the indoor unit load. Specifically, the air conditioner system detects and records the current ambient temperature through a sensor set in the indoor unit to sense the ambient temperature. The current ambient temperature is the temperature of the environment in which the indoor unit is located when the first instruction is received. The indoor unit load may specifically include the indoor unit's fan, wind shield mechanism, wind sweeping mechanism and other loads. The operating parameters of the indoor unit load specifically include the current gear position of the indoor unit fan, the current speed of the indoor unit fan, the current angle of the indoor unit wind shield, the current wind sweeping direction of the indoor unit wind shield and other operating parameters. In actual application, after the user's air conditioner system is turned on, the air conditioner system will run according to the temperature set by the user before. The outdoor mainboard system defaults to the Boost PFC circuit unit operation, and the Boost PFC circuit unit performs full-wave rectification output, so that some outdoor loads such as compressors can run efficiently. The user can also reset the temperature. When the air conditioner runs for a certain period of time, if the environmental conditions at this time are relatively light, the low-frequency operation of the air conditioner can meet the use requirements. The user can issue a first instruction through a remote control or other means. When the air conditioner system receives the first instruction, the air conditioner system will control the switching unit of the outdoor mainboard in the outdoor unit to switch from the Boost PFC circuit unit operation to the half-wave rectification circuit unit operation. At this time, the outdoor mainboard is half-wave rectified by the half-wave rectification circuit unit. Output, so that some outdoor loads such as compressors can run at a low frequency, and the power consumption is reduced. At the same time, the air conditioner system will record the current ambient temperature. For example, the temperature set by the user before is 26 degrees Celsius. When the air conditioner system receives the first instruction, the ambient temperature is 24 degrees Celsius. At this time, the air conditioner system will record 24 degrees Celsius as the current ambient temperature.When the air conditioner system receives the first instruction, it will also record the current operating parameters of the indoor unit load. For example, when the air conditioner system receives the first instruction, the indoor unit fan gear is in the second gear and the fan speed is 1500 rpm. At this time, the air conditioner system will record the parameters of the fan gear in the second gear and the fan speed of 1500 rpm as the current operating parameters of the indoor unit.

[0036] S120: Control the indoor unit load to operate with the current operating parameters, and control the outdoor unit load to operate with the current ambient temperature as the target temperature.

[0037] In a specific implementation, after the air conditioner system records the current ambient temperature and the current operating parameters of the indoor unit load, the air conditioner system controls the indoor unit load to operate with the current operating parameters, and uses the current ambient temperature as the target temperature to control the outdoor unit load to operate. Specifically, when the air conditioner system receives the first instruction, the system controls the indoor unit load to operate with the recorded current operating parameters. For example, when the air conditioner system receives the first instruction, the current operating parameters of the indoor unit load recorded are the second gear of the fan gear and the fan speed of 1500 rpm. The system controls the indoor unit load (indoor unit fan) to operate with "the second gear of the fan gear" and "the fan speed of 1500 rpm". At the same time, when the air conditioner system receives the first instruction, the temperature previously set by the user becomes invalid, and the system uses the recorded current ambient temperature as the target temperature to control the outdoor unit load to operate. The outdoor unit load may specifically include loads such as a compressor, an outdoor fan, and an electronic expansion valve. For example, when the air conditioner system receives the first instruction, the recorded current ambient temperature is 24 degrees Celsius, then the system will use 24 degrees Celsius as the target temperature to regulate the operation of the compressor. If the speed of the external fan or the opening of the electronic expansion valve involves the algorithm control of the target temperature, then the system will use 24 degrees Celsius as the target temperature to regulate the operation of the external fan or the electronic expansion valve at the same time. In practical applications, there are two situations when the air conditioner system receives the first instruction. The first situation is: when the first instruction is received, the current ambient temperature has not reached the temperature originally set by the user. In this case, the difference between the current ambient temperature recorded by the air conditioner system and the temperature previously set by the user is relatively large; the second situation is: when the first instruction is received, the current ambient temperature has reached the temperature originally set by the user. In this case, the difference between the current ambient temperature recorded by the air conditioner system and the temperature previously set by the user is relatively close or equal. In both cases, the temperature originally set by the user is invalid. The system controls the outdoor unit load to operate with the current ambient temperature as the target temperature, and controls the indoor unit load to operate with the current operating parameters. The switching unit of the outdoor unit mainboard will also switch from the Boost PFC circuit unit to the half-wave rectifier circuit unit, and the outdoor unit mainboard enters the half-wave rectifier output mode. In general, after receiving the first instruction, the indoor unit load in the air-conditioning system maintains the current operating parameters unchanged, and the outdoor unit operates with the current ambient temperature as the target temperature. The operating conditions of the indoor unit in the air-conditioning system remain within the time period when the first instruction is received, and the low power output of the outdoor unit mainboard in the half-wave rectifier mode is combined to limit the energy consumption of the air conditioner to a minimum, thereby improving the system energy efficiency of the air conditioner.

[0038] In one embodiment, if Figure 4 As shown, the step of controlling the outdoor unit load operation using the current ambient temperature as the target temperature includes: S121-S124.

[0039] S121. Obtain the actual operating frequency of the outdoor unit load.

[0040] In a specific implementation, the outdoor unit load includes a compressor, an outdoor fan, an electronic expansion valve, etc. The actual operating frequency of the outdoor unit load here is mainly the actual operating frequency of the compressor, and the air conditioner system obtains the actual operating frequency of the compressor.

[0041] S122. Obtain the frequency variation coefficient of the outdoor unit load.

[0042] In a specific implementation, the frequency variation coefficient of the outdoor unit load is mainly the frequency variation coefficient of the compressor, and the frequency variation coefficient can be calculated according to a corresponding algorithm of the system.

[0043] In one embodiment, if Figure 5 As shown, the step S122 of obtaining the frequency variation coefficient of the outdoor unit load includes: S1221-S1224.

[0044] S1221. Obtain real-time ambient temperature.

[0045] In a specific implementation, the real-time ambient temperature refers to the temperature of the indoor environment at all times. The air conditioner system can obtain the real-time indoor ambient temperature through a sensor on the indoor unit for sensing the ambient temperature.

[0046] S1222. Calculate a real-time temperature difference based on the real-time ambient temperature and the current ambient temperature.

[0047] In the specific implementation, after obtaining the real-time ambient temperature, the air-conditioning system calculates the real-time temperature difference based on the real-time ambient temperature and the current ambient temperature recorded when the first instruction is received. The real-time temperature difference needs to distinguish between the cooling mode and the heating mode of the air conditioner. The time-to-room temperature difference in the cooling mode is calculated by subtracting the current ambient temperature from the real-time ambient temperature. The time-to-room temperature difference in the heating mode is calculated by subtracting the real-time ambient temperature from the current ambient temperature. Taking the cooling mode as an example here, if the current ambient temperature recorded when the air-conditioning system receives the first instruction is 22°C, and the real-time ambient temperature obtained at a certain moment thereafter is 23°C, then the real-time temperature difference at that moment is 1°C. The real-time ambient temperature obtained at another moment thereafter is 24°C, then the real-time temperature difference at that moment is 2°C. Therefore, the air-conditioning system can obtain the real-time temperature difference at any time.

[0048] S1223. Obtain the temperature difference change of the real-time temperature difference within a preset time.

[0049] In a specific implementation, after the air conditioner system calculates the real-time temperature difference, it obtains the temperature difference change within a preset time. The preset time is usually 1 minute. For example, the real-time temperature difference at a certain moment is 1°C, and the real-time temperature difference after 1 minute is 3°C. Then it can be calculated that the temperature difference change within 1 minute is 2°C / minute.

[0050] S1224. Determine a frequency change coefficient of the outdoor unit load according to the real-time temperature difference and the temperature difference change.

[0051] In a specific implementation, after the air conditioner system obtains the temperature difference change amount of the real-time temperature difference within a preset time, it will determine the frequency change coefficient of the outdoor unit load according to the real-time temperature difference and the temperature difference change amount. Specifically, the frequency change coefficient is determined by two parameters, the real-time temperature difference and the temperature difference change amount. The specific value can be set according to the actual situation. An embodiment of the value of the frequency change coefficient is given below, as shown in Table 1. Table 1 is a comparison table of the value of the frequency change coefficient of the outdoor unit load, where n represents the frequency change coefficient, △T represents the real-time temperature difference, and △T' represents the temperature difference change amount of the real-time temperature difference △T within 1 minute. As shown in the following table, when △T>2 and -0.5≤△T'<0.3, n can be 1. The specific value of the frequency change coefficient can be determined according to the design of the real-time temperature difference and the temperature difference change amount in actual applications.

[0052]

[0053] Table 1

[0054] S123. Calculate the target frequency of the outdoor unit load according to the actual operating frequency of the outdoor unit load and the frequency variation coefficient of the outdoor unit load.

[0055] In a specific implementation, after the air conditioner system obtains the actual operating frequency and frequency variation coefficient of the outdoor unit load, it calculates the target frequency of the outdoor unit load according to the actual operating frequency and the frequency variation coefficient. Here, the target frequency of the outdoor unit load is mainly the target frequency of the compressor.

[0056] In one embodiment, the target frequency of the outdoor unit load is calculated based on the frequency change coefficient of the outdoor unit load and the actual operating frequency of the outdoor unit load, including: calculating the frequency change coefficient of the outdoor unit load according to the formula F=f1+△F*n, wherein F is the target frequency of the outdoor unit load, f1 is the actual operating frequency of the outdoor unit load, △F is the frequency change of the outdoor unit load, and n is the frequency change coefficient of the outdoor unit load.

[0057] In the specific implementation, the frequency variation coefficient of the outdoor unit load is calculated according to the formula F=f1+△F*n, where F represents the target frequency of the outdoor unit load, specifically the target frequency of the compressor, f1 represents the actual operating frequency of the outdoor unit load, specifically the actual operating frequency of the compressor, △F represents the frequency variation of the outdoor unit load, specifically the frequency variation of the compressor, △F is a fixed value, which can be taken according to actual needs, and n represents the frequency variation coefficient of the outdoor unit load, specifically the frequency variation coefficient of the compressor. After actual measurement, the frequency variation coefficient of the outdoor unit load is calculated by the formula F=f1+△F*n. The air conditioner can obtain the target frequency that is most suitable for the operation of the outdoor unit load under the premise of taking the current ambient temperature as the target temperature, control the operation of the outdoor unit load to reach the most ideal state, and reduce energy consumption by low-frequency operation.

[0058] S124: Control the outdoor unit load to operate at the target frequency of the outdoor unit load.

[0059] In a specific implementation, after calculating the target frequency of the outdoor unit load, the air conditioner system controls the outdoor unit load to operate at the target frequency of the outdoor unit load. Specifically, the outdoor unit load may include a compressor, an outdoor fan, an electronic expansion valve, etc. The target frequency of the outdoor unit load here is specifically the target frequency of the compressor. In actual applications, if the target frequency of the compressor is used in the speed control algorithm of the outdoor fan or the opening algorithm of the electronic expansion valve, the target frequency of the compressor is used to participate in the calculation. For example, if the air conditioner system calculates that the target frequency of the compressor is 50Hz, the compressor is controlled to operate at a frequency of 50Hz, and 50Hz is involved in the algorithm calculation of the speed of the outdoor fan and the opening of the electronic expansion valve to calculate the target speed of the outdoor fan and the target opening of the electronic expansion valve, and then the outdoor fan is controlled to operate at the target speed, and the electronic expansion valve is controlled to operate at the target opening, so that the outdoor unit load can reach the most ideal operating state under the premise of the current ambient temperature as the target temperature, reduce energy consumption, and improve the performance of the air conditioner.

[0060] The method of the present application controls the switching unit of the outdoor unit mainboard to switch the operation of the half-wave rectifier circuit unit by receiving a first instruction, and records the current ambient temperature and the current operating parameters of the indoor unit load, controls the indoor unit load to operate with the current operating parameters, and controls the operation of the outdoor unit load with the current ambient temperature as the target temperature. During the period when the user does not have high requirements for cooling or heating, the air conditioner can maintain a low power when operating at a low frequency, effectively reducing the energy consumption of the air conditioner, and improving the overall energy efficiency of the air conditioner.

[0061] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A low-frequency operation control method for an air conditioner, characterized in that: The method comprises: If the first instruction is received, the outdoor unit mainboard is controlled to switch the half-wave rectifier circuit unit to operate, and the current ambient temperature and the current operating parameters of the indoor unit load are recorded; The indoor unit load is controlled to operate with the current operating parameters, and the outdoor unit load is controlled to operate with the current ambient temperature as the target temperature.

2. The method according to claim 1, characterized in that The step of controlling the outdoor unit load operation by taking the current ambient temperature as the target temperature includes: Obtaining the actual operating frequency of the outdoor unit load; Obtaining a frequency variation coefficient of the outdoor unit load; Calculating the target frequency of the outdoor unit load according to the actual operating frequency of the outdoor unit load and the frequency change coefficient of the outdoor unit load; The outdoor unit load is controlled to operate at a target frequency of the outdoor unit load.

3. The method according to claim 2, characterized in that The step of obtaining the frequency variation coefficient of the outdoor unit load comprises: Get real-time ambient temperature; Calculating a real-time temperature difference according to the real-time ambient temperature and the current ambient temperature; Obtaining a temperature difference change amount of the real-time temperature difference within a preset time; The frequency variation coefficient of the outdoor unit load is determined according to the real-time temperature difference and the temperature difference variation.

4. The method according to claim 2, characterized in that: The calculating the target frequency of the outdoor unit load according to the frequency variation coefficient of the outdoor unit load and the actual operating frequency of the outdoor unit load includes: The frequency variation coefficient of the outdoor unit load is calculated according to the formula F=f1+ΔF*n, wherein F is the target frequency of the outdoor unit load, f1 is the actual operating frequency of the outdoor unit load, ΔF is the frequency variation of the outdoor unit load, and n is the frequency variation coefficient of the outdoor unit load.

5. The method according to any one of claims 1 to 4, characterized in that: The current operating parameters of the indoor unit load include a current gear position of the indoor unit fan, a current speed of the indoor unit fan, a current angle of the indoor unit wind shield, and a current wind sweeping direction of the indoor unit wind shield.

6. An air conditioner, characterized in that: include: Indoor unit; an outdoor unit connected to the indoor unit; An outdoor unit mainboard is arranged in the outdoor unit, and is integrated with a Boost PFC circuit unit, a half-wave rectifier circuit unit and a switching unit, wherein the Boost PFC circuit unit is connected to the half-wave rectifier circuit unit, and the switching unit connects the Boost PFC circuit unit and the half-wave rectifier circuit unit; The switching unit is used to switch the Boost PFC circuit unit and the half-wave rectifier circuit unit to operate mutually, so that one of the Boost PFC circuit unit and the half-wave rectifier circuit unit operates and the other stops.

7. The air conditioner according to claim 6, characterized in that: The Boost PFC circuit unit includes a rectifier bridge and a Boost boost circuit, the half-wave rectifier circuit unit includes a thyristor, the input end of the Boost boost circuit is connected to the output end of the rectifier bridge, the anode of the thyristor is connected to an input end of the rectifier bridge, and the cathode is connected to the output end of the Boost boost circuit, and the switching unit is connected between the input end and the output end of the rectifier bridge, wherein the switching unit is used to switch so that a loop is formed between the input end and the output end of only one of the rectifier bridge and the thyristor.

8. The air conditioner according to claim 7, characterized in that: The Boost circuit includes a power inductor, a power diode and a power switch tube. One end of the power inductor is connected to an output end of the rectifier bridge, and the other end is connected to the anode of the power diode and the drain of the power switch tube. The source of the power switch tube is connected to the other output end of the rectifier bridge, and the cathode of the power diode is connected to the cathode of the thyristor.

9. The air conditioner according to any one of claims 7 to 8, characterized in that: The switching unit includes a first switch and a second switch, wherein one end of the first switch is connected to the input end of the rectifier bridge, and the other end of the first switch is connected to one end of the second switch and is used for AC input, and the other end of the second switch is connected to the output end of the rectifier bridge, wherein the first switch and the second switch are used to disconnect when one of them is closed.

10. The air conditioner according to claim 9, characterized in that: The switching unit further includes a resonant capacitor and a resonant inductor, wherein the resonant capacitor is connected in parallel to both ends of the first switch and / or the second switch, and the resonant inductor is connected in series to one end of the first switch and / or the second switch.

Images