Air conditioning equipment and intelligent control device thereof

Abstract

The invention discloses air conditioning equipment and an intelligent control device thereof. The intelligent control device comprises a switch unit, a control unit and an electric energy metering unit. The switch unit is located on a power supply circuit between the direct-current power source and the air conditioner outdoor unit device, the control unit is electrically connected with the switch unit, and the control unit is in communication connection with the main control module and the electric energy meter unit. The control unit is used for receiving the direct-current power supply information sent by the electric energy meter unit in the first communication mode and sending the direct-current power supply information to the main control module of the air conditioner outdoor unit device in the second communication mode, and the main control module is further used for detecting alternating-current power supply information. The control unit is used for receiving a control instruction sent by the main control module according to the DC power supply information and the AC power supply information, and controlling a switch in the switch unit to be switched off or switched on according to the control instruction. The power-on opportunity and the power-off opportunity of the direct current between the direct-current power source and the air conditioner outdoor unit device can be intelligently controlled, and the power-on sequence and the islanding effect are prevented from being mistaken.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to an air conditioning device and an intelligent control device thereof. BACKGROUND

[0002] The air conditioning device can be powered by both grid alternating current and photovoltaic direct current, and the power-on sequence of the two power sources is that the alternating current is powered on first and the direct current is powered on later, thus forming a hybrid power supply mode. When the device needs to be powered off, the operator also manually cuts off the two power sources of direct current and alternating current, and the power-off operation based on manual control is prone to errors. For example: (1) During power-on, the operation sequence is wrong, the direct current is powered on first and the alternating current is powered on later, thus forming a current impact on the air conditioning device and damaging the device. (2) For power-off operation, if the operator only cuts off the alternating current source and forgets to cut off the direct current source, an island effect of photovoltaic independent power supply is formed. The island effect refers to when the power grid is powered off (the alternating current side is cut off), the photovoltaic system continues to supply power to the local load (such as an air conditioner), forming an independent running state isolated from the power grid.

[0003] When the air conditioning device forms an island effect, if the photovoltaic system is not disconnected in time after the power grid is powered off, the maintenance personnel may mistakenly think that the line is not electrified and touch the electrified part, causing an electric shock accident, and the unstable photovoltaic power supply may also cause damage to the device.

[0004] That is, in the related art, the direct current power supply of the air conditioning device is manually operated to cut off the power, the power-on sequence is prone to errors, and if the direct current power supply is not cut off, the island effect will cause harm and damage to the air conditioning device. SUMMARY

[0005] Therefore, the present application aims to at least partially solve one of the problems in the related art. To this end, the present application aims to provide an air conditioning device and an intelligent control device thereof.

[0006] The application provides an intelligent control device of an air conditioning equipment. The air conditioning equipment comprises an air conditioner outdoor unit device, the air conditioner outdoor unit device comprises a main control module and a driving module, the main control module is electrically connected with the driving module; the intelligent control device is built-in or external to the air conditioner outdoor unit device, a first end of the intelligent control device is connected with a direct current power supply through a voltage stabilizer, a second end of the intelligent control device is connected with a direct current power supply end of the main control module and a direct current power supply end of the driving module respectively, the intelligent control device comprises a switch unit, a control unit and an electric energy metering unit, the switch unit is located on a power supply circuit between the direct current power supply and the air conditioner outdoor unit device, the control unit is electrically connected with the switch unit, the control unit is communicatively connected with the main control module and the electric energy metering unit respectively; an alternating current power supply end of the main control module and an alternating current power supply end of the driving module are connected with an alternating current power supply respectively. The switch unit is used for controlling the on-off of the power supply circuit between the direct current power supply and the air conditioner outdoor unit device; the control unit is used for receiving direct current power supply information sent by the electric energy metering unit through a first communication mode, and sending the direct current power supply information to the main control module through a second communication mode, the main control module is also used for detecting alternating current power supply information; the control unit is used for receiving a control instruction sent by the main control module according to the direct current power supply information and the alternating current power supply information, and controlling a switch in the switch unit to open or close according to the control instruction.

[0007] In some embodiments, the electric energy metering unit is used for measuring direct current power supply information, and calculating direct current power supply electric energy according to the direct current power supply information and a preset calculation method.

[0008] In some embodiments, the direct current power supply information comprises direct current power supply parameters, and the control unit is also used for receiving the direct current power supply parameters sent by the electric energy metering unit, and sending the direct current power supply parameters to the main control module through the second communication mode.

[0009] In some embodiments, a communication line between the control unit and the main control module adopts a preset electrical isolation measure.

[0010] In some embodiments, the switch unit comprises a first switch and a second switch, the intelligent control device further comprises a first DC bus, the air conditioner outdoor unit device comprises a second DC bus, the positive pole of the first DC bus is connected with the positive pole of the second DC bus through the first switch, and the negative pole of the first DC bus is connected with the negative pole of the second DC bus through the second switch. The switch unit further comprises a third switch and a resistor, when the third switch and the second switch are closed, a pre-charging DC loop is formed between the intelligent control device and the air conditioner outdoor unit device, and the third switch and the first switch are connected in parallel after the third switch and the resistor are connected in series.

[0011] In some embodiments, the master control module is configured to generate the control instruction according to the DC power supply information and the AC power supply information, and send the control instruction to the control unit; and the control unit is configured to control the first switch, the second switch and the third switch to open and close according to the control instruction.

[0012] In some embodiments, when the master control module detects that the AC power supply information of the AC voltage from being powered on to being powered off abnormally or triggering the AC power supply under-voltage protection and receives the DC power supply information of the DC power supply being normal, the master control module generates a first control instruction for controlling the switch unit to open, and sends the first control instruction to the control unit; and the control unit is configured to control the first switch, the second switch and the third switch to open according to the first control instruction.

[0013] In some embodiments, when the master control module detects the AC power supply information of the AC voltage being restored to normal power supply, the master control module generates a second control instruction for controlling the switch unit to close, and the control unit controls the first switch, the second switch and the third switch to close in sequence according to the second control instruction in a preset time sequence.

[0014] In some embodiments, the preset time sequence is that the control unit controls the third switch to close first, and then controls the second switch to close after a first preset time, so that the first DC bus is connected with the bus capacitor of the second DC bus through a first DC loop for DC charging; after the second switch is closed for a second preset time, if the master control module detects the DC power supply information that the DC voltage of the second DC bus is greater than or equal to a preset voltage value, the master control module generates a third control instruction for controlling the first switch to close, and the control unit controls the first switch to close according to the third control instruction.

[0015] In some embodiments, the control instructions include pre-charge instructions, and the master module is configured to send the pre-charge instructions to the control unit, and the control unit is configured to control the third switch to be closed first and then control the second switch to be closed after the first preset time according to the pre-charge instructions.

[0016] In some embodiments, the control unit further includes a fault detection subunit configured to detect whether the switch unit has a fault, and the control unit is further configured to send fault information to the master module when the fault detection subunit detects that the switch unit has a fault.

[0017] In some embodiments, when the air conditioning device is in a pure direct current power supply mode of operation in which no alternating current is transmitted to the air conditioning device after power-on begins, the power metering unit sends the direct current power supply information to the master module, the master module generates fourth control instructions only according to the direct current power supply information, and the control unit is further configured to control the switches in the switch unit to be opened or closed according to the fourth control instructions.

[0018] The present application also provides an air conditioning device. The air conditioning device includes an air conditioning outdoor unit and the intelligent control device of any one of the embodiments described above, the air conditioning outdoor unit includes a master module and a driving module, the master module is electrically connected to the driving module, and the intelligent control device is built-in or external to the air conditioning outdoor unit.

[0019] The present application adds an intelligent control device to an air conditioning device, intelligently controls the opening or closing of the switch unit in the intelligent control device through a control unit, thereby intelligently controlling the power-on time and the cut-off time of direct current between a direct current power supply and an air conditioning outdoor unit, without manual operation, avoiding mistakes in the power-on sequence of direct current and alternating current in the air conditioning device, and avoiding the island effect caused by forgetting to cut off the direct current when the air conditioning device is in a hybrid power supply mode in which both direct current and alternating current are supplied, thereby avoiding safety hazards and damage to the air conditioning device.

[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0022] Figure 1 is a structural schematic diagram of an air conditioning device including an intelligent control device according to some embodiments of the present application;

[0023] Figure 2is a schematic diagram of an overall circuit connection of an air conditioning apparatus including an intelligent control device according to an embodiment of the present application;

[0024] Figure 3 is a schematic diagram of a partial circuit connection of an air conditioning apparatus including an intelligent control device according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements are denoted by like or similar reference numerals, and the embodiments described below are merely exemplary and are intended to explain the present application, and are not to be understood as limiting the present application.

[0026] In the description of the present application, the terms "first", "second", etc. are used only for the purpose of description, and are not to be understood as indicating or implying relative importance or implying the number of the technical features indicated. Thus, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0027] In the description of the present application, it is to be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting" are to be understood broadly, which can mean fixed connection, or detachable connection, or integral connection; can mean mechanical connection, or electrical connection, or can communicate with each other; can mean direct connection, or indirect connection through an intermediate medium; can mean the internal communication of two elements or the interaction relationship between two elements. 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.

[0028] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeatedly refer to numbers and / or letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0029] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, in which like or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, only for the purpose of explaining the present application, and are not to be understood as limiting the present application.

[0030] Please refer toFigure 1 This application provides an air conditioning device 1000. The air conditioning device 1000 includes an outdoor unit 200 and an indoor unit. Both the indoor unit and the outdoor unit 200 can be powered by AC power from the mains or by DC power.

[0031] Among them, the air conditioning equipment 1000 can be a photovoltaic air conditioner, in which case both the indoor unit and the outdoor unit 200 can be powered by photovoltaic DC power provided by the photovoltaic solar panel.

[0032] The air conditioner outdoor unit 200 includes a main control module 210 and a drive module 220, which are electrically connected. The main control module 210 generates control commands for the compressor and fan by collecting temperature sensor signals or pressure sensor signals, and interacts with the drive module 220 via a CAN / RS-485 bus. At the same time, it manages the switching power supply to provide power to each component.

[0033] like Figure 2 As shown, the main control module 210 may include a main control board ( Figure 2 The drive module 220 may include components such as a microcontroller unit (MCU), a switching power supply, and diodes.

[0034] The AC power supply terminals of the main control module 210 and the drive module 220 are respectively connected to an AC power source. The AC power source can be, for example, mains power. Figure 2 As shown, the air conditioner outdoor unit 200 may also include a filter 230. The main control module 210 and drive module 220 of the air conditioner outdoor unit 200 can be connected to the AC power supply through the filter 230. The function of the filter 230 is to suppress electromagnetic interference and ensure power quality. The filter 230 may also be equipped with an energy meter for calculating the AC power flowing into the air conditioner outdoor unit 200.

[0035] Please continue reading. Figure 1 and Figure 2The application also provides a smart control device 100 of the air conditioning equipment 1000. The smart control device 100 is built-in or external to the air conditioner outdoor unit device 200. The first end of the smart control device 100 is connected to the direct current power supply through a voltage stabilizer. The second end of the smart control device 100 is connected to the direct current power supply end of the main control module 210 and the direct current power supply end of the driving module 220 respectively. The smart control device 100 comprises a switch unit 10, a control unit 20 and an electric energy metering unit 30. The switch unit 10 is located on the power supply circuit between the direct current power supply and the air conditioner outdoor unit device 200. The control unit 20 is electrically connected to the switch unit 10. The control unit 20 is communicatively connected to the main control module 210 and the electric energy metering unit 30 respectively. The switch unit 10 is used to control the on-off of the power supply circuit between the direct current power supply and the air conditioner outdoor unit device 200. The control unit 20 is used to receive the direct current power supply information sent by the electric energy metering unit 30 through a first communication mode and send the direct current power supply information to the main control module 210 through a second communication mode. The main control module 210 is also used to detect the alternating current power supply information. The control unit 20 is used to receive the control instruction issued by the main control module 210 according to the direct current power supply information and the alternating current power supply information and control the switch in the switch unit 10 to open or close according to the control instruction. The first communication mode and the second communication mode can be the same or different and are not limited herein.

[0036] It can be understood that, since the switch unit 10 is located on the power supply circuit between the direct current power supply and the air conditioner outdoor unit device 200, the control unit 20 is electrically connected to the switch unit 10, and the control unit 20 is communicatively connected to the main control module 210 and the electric energy metering unit 30 of the air conditioner outdoor unit device 200 respectively, therefore, the control unit 20 can receive the direct current power supply information sent by the electric energy metering unit 30 through communication and send the direct current power supply information to the main control module 210 through a preset communication mode. The main control module 210 detects and obtains the alternating current power supply information in the air conditioner outdoor unit device 200. The main control module 210 generates a control instruction according to the direct current power supply information and the alternating current power supply information. Then, the control unit 20 can receive the control instruction transmitted by the main control module 210 through the communication mode to control the switch in the switch unit 10 to open or close.

[0037] The control instruction may, for example, comprise a switch closing instruction, a switch opening instruction and a pre-charge execution command, and is not limited herein.

[0038] That is, in the mixed power working mode in which the air conditioner outdoor unit device 200 is powered by direct current and alternating current at the same time, when the alternating current is abnormally powered off, the control unit 20 can control the switch in the switch unit 10 to open according to the switch opening instruction issued by the main control module 210 to achieve control to cut off the power supply path of the direct current power supply to the air conditioner outdoor unit device 200, so as to stop providing the direct current to the air conditioner outdoor unit device 200.

[0039] After the alternating current is restored, the control unit 20 can control the switch to be closed again according to the pre-charge execution command and the switch closing instruction from the master control module 210, so as to control the direct current power supply to supply power to the air conditioner outdoor unit device 200 again.

[0040] The voltage stabilizer and the direct current power supply can be built-in or external to the air conditioner outdoor unit device 200, which is not limited herein. As shown in Figure 2 The direct current power supply can be a photovoltaic solar panel, which can directly convert solar energy into direct current. The direct current flows into the intelligent control device 100 after the voltage stabilization of the voltage stabilizer.

[0041] Since the second end of the intelligent control device 100 is connected to the direct current power supply end of the master control module 210 and the direct current power supply end of the driving module 220 respectively, the direct current information of the air conditioner outdoor unit device 200 can specifically include the direct current power supply of the master control module 210 and the driving module 220 respectively.

[0042] The intelligent control device 100 is built-in or external to the air conditioner outdoor unit device 200, which means that the intelligent control device 100 of the present application can be installed in the air conditioner outdoor unit device 200, or installed outside the air conditioner outdoor unit device 200 (such as Figure 1 which is not limited herein.

[0043] Therefore, the present application adds the intelligent control device 100 to the air conditioner 1000, and intelligently controls the opening or closing of the switch unit 10 in the intelligent control device 100 through the control unit 20, so as to intelligently control the power-on time and the cut-off time of the direct current between the direct current power supply and the air conditioner outdoor unit device 200, without manual operation. This can avoid the mistake of the power-on sequence of the direct current and the alternating current in the air conditioner 1000, and avoid the island effect caused by forgetting to cut off the direct current when the air conditioner 1000 is in the hybrid power supply mode of direct current and alternating current, so as to avoid safety hazards and damage to the air conditioner 1000.

[0044] In some embodiments, the electric energy metering unit 30 is used to measure the direct current power supply information, and calculate the direct current power supply electric energy according to the direct current power supply information and a pre-designed calculation method.

[0045] Specifically, the electric energy metering unit 30 can be a direct current meter. The direct current power supply information includes direct current voltage and direct current.

[0046] The pre-designed calculation method can be a pre-designed calculation formula for calculating direct current electric energy according to direct current voltage and direct current.

[0047] That is, the application can add a direct current meter in the intelligent control device 100, and the direct current voltage and direct current measured by the direct current meter can be used to measure the direct current power supply energy according to a pre-designed calculation formula, so that the energy saving condition of the air conditioning equipment can be known.

[0048] In some embodiments, the direct current power supply information includes a direct current power supply parameter, and the control unit 20 is further configured to receive the direct current power supply parameter sent by the electric energy metering unit 30 and send the direct current power supply parameter to the master control module 210 through the second communication mode.

[0049] Specifically, the second communication mode can be an RS485 communication mode. The direct current power supply parameter includes a voltage, a current, a power, a cumulative electric quantity, and the like.

[0050] The control unit 20 and the master control module 210 are communicatively connected through the second communication mode, and specifically, a communication interface of the control unit 20 can be an RS485 interface (A / B line), which is connected to a communication terminal of a communication line of the master control module 210.

[0051] That is, the control unit 20 can transmit the direct current power supply parameter measured by the electric energy metering unit 30 to the master control module 210 through the RS485 communication, so as to realize data interaction, intelligent control and energy efficiency optimization between the intelligent control device 100 and the air conditioning outdoor unit 200, and help the air conditioning equipment 1000 to master the direct current energy use condition in real time.

[0052] In some embodiments, a preset electrical isolation measure is adopted for the communication line between the control unit 20 and the master control module 210.

[0053] Specifically, the preset electrical isolation measure can be an isolation measure of strengthening insulation on both sides of the communication. The strengthened insulation of the communication primary and secondary refers to a double insulation or reinforced insulation measure adopted for the communication line between the intelligent control device 100 and the air conditioning outdoor unit 200.

[0054] That is, the preset electrical isolation measure is adopted for the communication line between the control unit 20 and the master control module 210, so that the communication between the intelligent control device 100 and the air conditioning outdoor unit 200 can meet the safety extra-low voltage (SELV) requirement. The SELV requirement includes that the voltage of alternating current is limited to less than or equal to 30V, the voltage of direct current is limited to less than or equal to 60V, and the electric energy cannot be directly obtained from the power grid (high-voltage alternating current) or a non-isolated power supply, but must be obtained through double insulation or reinforced insulation isolation, and grounding is prohibited.

[0055] Please refer to Figures 1 to 3In some embodiments, the switching unit 10 includes a first switch K1 and a second switch K2, the intelligent control device 100 further includes a first DC bus PV2, the air conditioner outdoor unit device 200 includes a second DC bus PV3, the positive pole PV2+ of the first DC bus PV2 is connected with the positive pole PV3+ of the second DC bus PV3 through the first switch K1, and the negative pole PV2- of the first DC bus PV2 is connected with the negative pole PV3- of the second DC bus PV3 through the second switch K2. The switching unit 10 further includes a third switch K3 and a resistor PCT1, when the third switch K3 and the second switch K2 are closed, a pre-charging DC loop is formed between the intelligent control device 100 and the air conditioner outdoor unit device 200, and after the third switch K3 is connected in series with the resistor PTC1, the third switch K3 is connected in parallel with the first switch K1.

[0056] Specifically, the first switch K1 and the second switch K2 can be high-voltage DC contactors. The high-voltage DC contactor is an electrical switching device used to make and break high-voltage DC circuits, which can safely and reliably control the on-off of high-voltage DC loads.

[0057] That is, the switching unit 10 in the intelligent control device 100 of the present application can realize the on-off of the DC power in the air conditioner outdoor unit device 200 by setting the DC contactor.

[0058] The third switch K3 can be a pre-charging relay, which can realize automatic control, thereby protecting the circuit inside the air conditioner device 1000 from overload and arc damage.

[0059] The path of the pre-charging DC loop is that the current flows from the positive pole through the third switch K3 connected in series with the resistor PTC1, and then the second switch K2 is attracted, and the current returns through the negative pole, forming a charging loop. The resistor PCT1 can be a thermistor.

[0060] In this way, the combination of the pre-charging relay and the main contactor in the high-voltage DC system of the present application can further ensure the safety and reliability of the intelligent control device 100 controlling the on-off of the DC power, and prolong the service life of the air conditioner device 1000.

[0061] In some embodiments, the main control module 210 is configured to generate a control instruction according to the DC power supply information and the AC power supply information, and send the control instruction to the control unit 20. The control unit 20 is configured to control the first switch K1, the second switch K2 and the third switch K3 to open and close according to the control instruction.

[0062] The AC power supply information can include the numerical value information of the AC voltage and the AC current, and can also include related information whether the under-voltage protection of the AC power supply is triggered, which is not limited herein.

[0063] For example, when the host module 210 detects that the AC power supply information of the air conditioner outdoor unit device 200 is abnormal power failure or triggers the AC power supply under-voltage protection when the AC voltage from the presence to the absence, and the DC power supply information received by the host module 210 is normal DC power supply, the host module 210 can send a control instruction to the control unit 20 through the communication mode of RS485, to control the first switch K1, the second switch K2 and the third switch K3 to be disconnected, to timely and intelligently and effectively perform power-off operation on the DC power supply line, and realize the anti-islanding protection function of the intelligent control device 100.

[0064] In this way, the intelligent control device 100 of the present application can generate a control instruction by detecting the AC power supply information of the host module 210 and the DC power supply information received by the host module 210, and send it to the control unit 20, so that the control unit 20 can timely and intelligently and effectively perform complete power-off operation on the DC power supply line according to the control instruction, and realize the anti-islanding protection function of the intelligent control device 100.

[0065] In some embodiments, when the host module 210 detects the AC power supply information of the AC voltage from the presence to the absence and triggers the AC power supply under-voltage protection, and receives the DC power supply information of the DC power supply normal, the host module 210 generates a first control instruction to control the switch unit 10 to be disconnected, and sends the first control instruction to the control unit 20. The control unit 20 is used to control the first switch K1, the second switch K2 and the third switch K2 to be disconnected according to the first control instruction.

[0066] In this way, the control unit 20 in the intelligent control device 100 of the present application can timely and intelligently and effectively perform power-off operation on the DC power supply line according to the first control instruction issued by the host module 210, and realize the anti-islanding protection function of the intelligent control device 100.

[0067] In some embodiments, after the host module 210 detects the AC power supply information of the AC voltage recovery normal power supply, the host module 210 generates a second control instruction to control the switch unit 10 to be closed, and the control unit 20 controls the first switch K1, the second switch K2 and the third switch K3 to be closed in turn according to the second control instruction.

[0068] It can be understood that the initial state of the second DC bus PV3 corresponding to the parallelly connected bus capacitor is zero voltage, and if the first switch K1 or the second switch K2 is directly closed to connect the high-voltage DC (such as 400Vdc), the bus capacitor is equivalent to a short circuit, which will generate a great capacitor inrush current, thereby causing the mechanical contact of the first switch K1 or the second switch K2 to be welded or damaged, and the power switch device in the inverter containing the bus capacitor, and causing the DC voltage of the second DC bus PV3 to drop suddenly and trigger the protection shutdown of the air conditioner outdoor unit device 200.

[0069] Therefore, the intelligent control device 100 of the present application sets that when the control unit 20 controls the first switch K1, the second switch K2 and the third switch K3 to be closed again after being controlled to be opened according to the second control instruction, the control unit 20 can control the first switch K1, the second switch K2 and the third switch K3 to be closed in turn according to the preset timing, thereby avoiding that the sudden drop of the direct current voltage of the second direct current bus PV3 triggers the protection shutdown of the air conditioner outdoor unit device 200 or other faults.

[0070] In some embodiments, the preset timing is that the control unit 20 controls the third switch K3 to be closed first, and then controls the second switch K2 to be closed after a first preset time, so that the first direct current bus PV2 is directly charged by the bus capacitor connected by the first direct current loop PTC1 and the second direct current bus PV3. After the second switch K2 is closed for a second preset time, if the main control module 210 detects the direct current supply information that the direct current voltage of the second direct current bus PV3 is greater than or equal to the preset voltage value, a third control instruction for controlling the first switch K1 to be closed is generated. The control unit 20 controls the first switch K1 to be closed according to the third control instruction.

[0071] Specifically, the third switch K3 is usually connected in series with the resistor PCT1, and after the third switch K3 is closed first, the bus capacitor can be slowly charged through the resistor PCT1, which can avoid the damage of devices caused by the surge current generated when the first switch K1 and the second switch K2 are directly connected.

[0072] The first preset time can be 2S, 3S or 4S, which is not limited here.

[0073] When the bus capacitor voltage is charged to be close to the input voltage (such as 90% of the PV voltage) through the third switch K3, K2 (the main contactor) is closed to short-circuit the pre-charge resistor and turn into a low-impedance path, thereby reducing the heat loss of the resistor. For example, the first preset time can be 2S, and the effect of setting the first preset time and then closing the second switch K2 is to ensure that the bus capacitor voltage is high enough to close the second switch K2, thereby avoiding the damage of devices caused by the remaining voltage difference due to the bus capacitor voltage not reaching the set voltage.

[0074] The second preset time can be 5S, 6S or 7S, which is not limited here. For example, the second preset time can be 5S, and the effect of setting the second preset time and then closing the first switch K1 is to ensure that K2 is completely closed, thereby avoiding the contactor bouncing, and leaving time to detect whether the direct current voltage of the second direct current bus PV3 continues to meet the standard, and ensuring that the inverter in the air conditioner outdoor unit device 200 can be started normally.

[0075] If the main control module 210 detects insufficient DC voltage on the second DC bus PV3, for example, if the DC voltage of the second DC bus PV3 is less than 350Vdc, since the second DC bus PV3 provides the operating voltage for the inverter in the outdoor unit of the air conditioner 200, if the DC voltage of the second DC bus PV3 is insufficient, the inverter cannot properly modulate the output AC power, and the inverter may fail to start or report a "DC undervoltage" fault. The inverter has a DC-AC conversion function.

[0076] Therefore, after the second switch K2 is closed for a second preset time, if the main control module 210 detects that the DC voltage of the second DC bus PV3 is greater than or equal to a preset voltage value (e.g., 350Vdc), it generates a third control command to close the first switch K1. The control unit 20 controls the first switch K1 to close according to the third control command, and then controls the third switch K3 to open after the first switch K1 is closed. This ensures that the bus voltage reaches a safe threshold (e.g., ≥350Vdc) before closing the first switch K1, and then controls the third switch K3 to open, guaranteeing that the inverter in the air conditioner outdoor unit 200 can start normally.

[0077] In other words, the intelligent control device 100 of this application balances the lifespan and reliability of the air conditioning equipment 1000 by controlling the rise rate of DC current and DC voltage in stages.

[0078] In some implementations, the control command includes a pre-charge command, which the main control module 210 sends to the control unit 20. The control unit 20 controls the third switch K3 to close according to the pre-charge command.

[0079] That is, the main control module 210 in the air conditioner outdoor unit 200 of this application can send a pre-charging command to the control unit 20, so that the control unit 20 controls the third switch K3 to close first, and then controls the second switch K2 to close after a first preset time, so that the air conditioner outdoor unit 200 is pre-charged through the pre-charging DC circuit containing the resistor PCT1, the third switch K3, and the second switch K2.

[0080] In some embodiments, the control unit 20 further includes a fault detection subunit, which is used to detect whether the switching unit 10 has failed. The control unit 20 is also used to send fault information to the main control module 210 after the fault detection subunit detects that the switching unit 10 has failed.

[0081] That is, the control unit 20 of the present application also has a fault detection function, which can detect in real time whether the switches or other components in the switch unit 10 have failed. Once the switches or other components fail, the control unit 20 can report the fault information to the air conditioner outdoor unit device 200, so that the air conditioner outdoor unit device 200 can timely send a control instruction to control the switch unit 10 to disconnect all switches, thereby ensuring that the air conditioner outdoor unit device 200 is not damaged.

[0082] In addition, in order to ensure that the direct current in the direct current power supply end of the main control module 210 and the direct current power supply end of the driving module 220 of the intelligent control device 100 and the air conditioner outdoor unit device 200 flows in one direction and does not flow in the opposite direction, so as to normally provide direct current power to the air conditioner outdoor unit device 200, as shown in Figure 3 The power supply circuit between the switch unit 10 and the main control module 210 and the driving module 220 is provided with a one-way flow device 300. The one-way flow device 300 can be a one-way diode, for example.

[0083] It should be noted that the air conditioner 1000 of the present application can support a pure direct current power supply mode using only direct current for power supply. That is, the air conditioner indoor unit and the air conditioner outdoor unit 200 of the air conditioner 1000 can only be connected to the photovoltaic direct current power supply through the intelligent control device 100, and powered by the photovoltaic direct current power supply, without the need to connect to the mains for power supply. At this time, since the alternating current is not connected to the air conditioner 1000 from the power-on, the air conditioner 1000 will not generate the island effect in the mixed power supply mode of direct current and alternating current.

[0084] In some embodiments, when the air conditioner 1000 is in the pure direct current power supply mode in which the alternating current is not transmitted to the air conditioner 1000 from the power-on, the electric energy metering unit 30 sends the direct current power supply information to the main control module 210, and the main control module 210 generates a fourth control instruction only according to the direct current power supply information, and the control unit 20 is further configured to control the switches in the switch unit 10 to open or close according to the fourth control instruction.

[0085] That is, when the air conditioner 1000 is in the pure direct current power supply mode, the electric energy metering unit 30 can send the direct current power supply information to the main control module 210. Since the alternating current is not connected to the air conditioner 1000 from the power-on, the main control module 210 does not detect the alternating current power supply information. At this time, the main control module 210 generates a fourth control instruction only according to the direct current power supply information, and the control unit 20 in the intelligent control device 100 receives the fourth control instruction to control the opening and closing of the switches in the switch unit 10.

[0086] For example, when the DC power supply information shows that the DC voltage is too low, the fourth control instruction is to control the switch in the switch unit 10 to be turned off, and the control unit 20 receiving the fourth control instruction can control the switch in the switch unit 10 to be turned off.

[0087] For another example, when the DC power supply information shows that the DC voltage is recovered from the too low state to the normal voltage value, the fourth control instruction is to control the switch in the switch unit 10 to be turned on, and the control unit 20 receiving the fourth control instruction can control the switch in the switch unit 10 to be turned on in sequence.

[0088] In this way, the air conditioning equipment 1000 of the present application can also control the switch in the switch unit 10 to be turned off and turned on only through the DC power supply information when in the working state of the pure DC power supply mode.

[0089] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An intelligent control device for an air conditioning unit, characterized in that, The air conditioning equipment includes an outdoor unit, which comprises a main control module and a drive module, the main control module being electrically connected to the drive module. An intelligent control device is either built into or externally mounted on the outdoor unit. The first terminal of the intelligent control device is connected to a DC power supply via a voltage regulator, and the second terminal is connected to both the DC power supply terminals of the main control module and the drive module. The intelligent control device includes a switching unit, a control unit, and an energy metering unit. The switching unit is located on the power supply circuit between the DC power supply and the outdoor unit. The control unit is electrically connected to the switching unit and is communicatively connected to both the main control module and the energy metering unit. The AC power supply terminals of the main control module and the drive module are connected to an AC power supply. The switching unit is used to control the on / off state of the power supply circuit between the DC power supply and the outdoor unit of the air conditioner; The control unit is used to receive DC power supply information sent by the energy meter unit through a first communication method, and send the DC power supply information to the main control module through a second communication method. The main control module is also used to detect AC power supply information. The control unit is used to receive control commands issued by the main control module based on the DC power supply information and the AC power supply information, and to control the switch in the switching unit to open or close according to the control commands.

2. The intelligent control device according to claim 1, characterized in that, The energy meter unit is used to measure DC power supply information and to measure DC power supply energy according to the DC power supply information and a preset calculation method.

3. The intelligent control device according to claim 2, characterized in that, The DC power supply information includes DC power supply parameters. The control unit is also used to receive the DC power supply parameters sent by the energy meter unit and send the DC power supply parameters to the main control module through the second communication method.

4. The intelligent control device according to claim 3, characterized in that, The communication line between the control unit and the main control module is equipped with preset electrical isolation measures.

5. The intelligent control device according to claim 1, characterized in that, The switching unit includes a first switch and a second switch. The intelligent control device also includes a first DC bus. The air conditioner outdoor unit includes a second DC bus. The positive terminal of the first DC bus and the positive terminal of the second DC bus are connected through the first switch. The negative terminal of the first DC bus and the negative terminal of the second DC bus are connected through the second switch. The switching unit further includes a third switch and a resistor. When the third switch and the second switch are closed, a pre-charged DC circuit is formed between the intelligent control device and the air conditioner outdoor unit. After the third switch and the resistor are connected in series, the third switch and the first switch are connected in parallel.

6. The intelligent control device according to claim 5, characterized in that, The main control module is used to generate the control command based on the DC power supply information and the AC power supply information, and send the control command to the control unit; The control unit is used to control the first switch, the second switch, and the third switch to open and close according to the control command.

7. The intelligent control device according to claim 6, characterized in that, When the main control module detects the AC power supply information indicating an abnormal power outage or triggering AC power undervoltage protection due to a change in AC voltage from present to absent, and receives the DC power supply information indicating normal DC power supply, it generates a first control command to control the switching unit to disconnect, and sends the first control command to the control unit. The control unit is used to control the first switch, the second switch and the third switch to disconnect according to the first control command.

8. The intelligent control device according to claim 7, characterized in that, After the main control module detects that the AC power supply information indicates that the AC voltage has returned to normal, it generates a second control command to control the closing of the switch unit. The control unit controls the first switch, the second switch, and the third switch to close sequentially according to the second control command and a preset timing sequence.

9. The intelligent control device according to claim 8, characterized in that, The preset timing sequence is as follows: The control unit first controls the third switch to close, and after a first preset time, controls the second switch to close, so that the first DC bus is DC charged through the bus capacitor connected to the second DC bus via the first DC circuit; After the second switch is closed for a second preset time, if the main control module detects that the DC voltage of the second DC bus is greater than or equal to the preset voltage value, it generates a third control command to control the first switch to close, and the control unit controls the first switch to close according to the third control command.

10. The intelligent control device according to claim 9, characterized in that, The control command includes a pre-charge command. The main control module is used to send the pre-charge command to the control unit. The control unit controls the third switch to close first according to the pre-charge command, and then controls the second switch to close after the first preset time.

11. The intelligent control device according to claim 1, characterized in that, The control unit further includes a fault detection subunit, which is used to detect whether the switching unit has malfunctioned. The control unit is also used to send fault information to the main control module after the fault detection subunit detects that the switching unit has malfunctioned.

12. The intelligent control device according to claim 1, characterized in that, When the air conditioning unit is in a pure DC power supply mode where no AC power is transmitted to the air conditioning unit when it is powered on, the power metering unit sends the DC power supply information to the main control module. The main control module generates a fourth control command based solely on the DC power supply information. The control unit is also used to control the switch in the switching unit to open or close based on the fourth control command.

13. An air conditioning device, characterized in that, The air conditioning equipment includes an outdoor unit and an intelligent control device as described in any one of claims 1 to 12. The outdoor unit includes a main control module and a drive module, and the main control module is electrically connected to the drive module. The intelligent control device is built into or externally placed in the outdoor unit.

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