Air conditioning system, awakening method, starting method, controller and main control board

Abstract

The invention discloses an air conditioning system, an awakening method, a starting method, a controller and a main control board. A current loop communication circuit is arranged between an indoor main control board and an outdoor main control board of the air conditioning system. The air conditioning system further comprises a first switch, a second switch, an auxiliary awakening branch circuit, an S line connected with the current loop communication circuit and a capacitor assembly of a first switching power supply on the outdoor side. And under the condition that the first switch is closed and the second switch is opened, an energy charging loop for charging the capacitor assembly of the first switching power supply is formed between the L line and the N line of the current loop communication circuit through the S line of the current loop communication circuit and the auxiliary wake-up branch, so that the outdoor main control board is started by utilizing the voltage at the two ends of the capacitor assembly of the first switching power supply. In the embodiment of the invention, the auxiliary wake-up branch is arranged in the energy charging loop and is connected with the first switch in series for voltage division, so that the space of layout elements on the indoor main control board can be saved, and the cost of the indoor main control board can be lower.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner control, and in particular to an air conditioning system, a wake-up method, a start-up method, a controller and a main control board. BACKGROUND

[0002] The communication mode between the indoor unit and the outdoor unit in a variable frequency split air conditioner is mostly current loop communication, which has the characteristics of strong anti-interference ability and low cost. In order to realize low-power standby, an indoor main control board generally reserves a high-power relay for cutting off the power supply of the outdoor unit, so as to reduce the power consumption of the whole machine when standby is needed. If cooling or heating is needed in the standby state, the indoor main control board controls the high-power relay to attract, supplies power to the outdoor unit and then wakes up the outdoor main control board.

[0003] With more and more additional functions of air conditioners, more elements need to be laid out in the limited space of the indoor main control board, usually requiring miniaturization of the elements. However, the high-power relay bears a large power, and its volume and height are large, so it is difficult to miniaturize the relay. SUMMARY

[0004] The embodiment provides an air conditioning system, a wake-up method, a start-up method, a controller and a main control board, which can save the space for laying out elements on the indoor main control board.

[0005] In a first aspect, the embodiment of the present application provides an air conditioning system, wherein a current loop communication circuit is arranged between an indoor main control board and an outdoor main control board of the air conditioning system, and the current loop communication circuit is connected to an alternating current input end of a first switching power supply of the outdoor main control board through an L line and an N line on the outdoor side; the air conditioning system further comprises:

[0006] a first switch, which is connected to the L line and an S line of the current loop communication circuit on the indoor side;

[0007] a second switch, which is arranged between the L line of the current loop communication circuit and the alternating current input end of the first switching power supply on the outdoor side;

[0008] an auxiliary wake-up branch, which is connected to the S line of the current loop communication circuit and a capacitor assembly of the first switching power supply on the outdoor side; in a case where the first switch is closed and the second switch is opened, the L line and the N line of the current loop communication circuit form a charging loop for the capacitor assembly of the first switching power supply through the S line of the current loop communication circuit and the auxiliary wake-up branch, so as to start the outdoor main control board by using the voltage across the capacitor assembly of the first switching power supply.

[0009] In some embodiments, the first switching power supply comprises a first rectifier bridge circuit and a first transformer, one end of a capacitor assembly of the first switching power supply is connected to a positive output end of the first rectifier bridge circuit, the other end of the capacitor assembly of the first switching power supply is connected to a negative output end of the first rectifier bridge circuit, and the capacitor assembly of the first switching power supply is connected to a primary side of the first transformer, and a secondary side of the first transformer is connected to a main control chip of the outdoor master control board.

[0010] In some embodiments, the auxiliary wake-up branch comprises a unidirectional conduction element and a voltage dividing resistor, a negative end of the unidirectional conduction element is connected to an S line of the current loop communication circuit, a positive end of the unidirectional conduction element is connected to one end of the voltage dividing resistor, and the other end of the voltage dividing resistor is connected to a connection point of the capacitor assembly of the first switching power supply and the negative output end of the first rectifier bridge circuit.

[0011] In some embodiments, the first switching power supply further comprises a voltage conversion circuit, and the secondary side of the first transformer is connected to the main control chip of the outdoor master control board through the voltage conversion circuit.

[0012] In some embodiments, the communication power supply comprises a first resistor, a second resistor, a first diode, a clamping capacitor and a voltage stabilizing diode, the clamping capacitor is arranged on an N line of the current loop communication circuit at an indoor side, the clamping capacitor, the voltage stabilizing diode and the first resistor are connected in parallel, a positive electrode of the voltage stabilizing diode is connected to an L line of the current loop communication circuit through the second resistor and the first diode, and a negative electrode of the voltage stabilizing diode provides a clamping voltage.

[0013] In some embodiments, the first switch is a low-power relay, and the second switch is a high-power relay.

[0014] In a second aspect, embodiments of the present application provide a wake-up method applied to an indoor master control board in the air conditioning system as described in the first aspect, and the wake-up method comprises:

[0015] In response to an outdoor unit wake-up instruction, the first switch is controlled to be closed to form the energy charging circuit to charge the capacitor assembly of the first switching power supply;

[0016] When a closing duration of the first switch reaches a preset closing duration, the first switch is controlled to be opened.

[0017] In some embodiments, the wake-up method further comprises:

[0018] The power-off moment of the outdoor unit and the stop moment of the outdoor unit are recorded;

[0019] determine an actual power-off duration according to a time difference between the power-off moment and the stop moment;

[0020] determine the preset closing duration according to the actual power-off duration and a complete discharge duration of the capacitor assembly of the first switching power supply.

[0021] In some embodiments, the auxiliary wake-up branch includes a voltage dividing resistor, and the capacitor assembly of the first switching power supply in the charging loop is connected in series with the voltage dividing resistor; and the determination of the preset closing duration according to the actual power-off duration and the complete discharge duration of the capacitor assembly of the first switching power supply includes:

[0022] determine an energy consumption ratio according to the actual power-off duration and the complete discharge duration;

[0023] determine the preset closing duration according to the energy consumption ratio, a resistance value of the voltage dividing resistor, a rated voltage and a capacitance of the capacitor assembly of the first switching power supply.

[0024] In some embodiments, after the first switch is controlled to be closed, the wake-up method further includes:

[0025] sending an acknowledgement instruction to the outdoor master control panel through the current loop communication circuit and waiting for an acknowledgement response instruction sent by the outdoor master control panel;

[0026] if the acknowledgement response instruction is not received within a response duration threshold, controlling the first switch to be closed again.

[0027] In some embodiments, the wake-up method further includes:

[0028] in the case that the acknowledgement response instruction is not received within the response duration threshold, recording a failure number;

[0029] when the failure number reaches a preset number, issuing a fault reminder.

[0030] In a third aspect, embodiments of the present application provide a starting method applied to an outdoor master control panel in the air conditioning system as described in the first aspect, and the starting method includes:

[0031] closing the second switch after power-on wake-up.

[0032] In some embodiments, after the second switch is closed, the starting method further includes:

[0033] turning on an outdoor data receiving optocoupler of the current loop communication circuit and waiting for receiving an acknowledgement instruction sent by the indoor master control panel;

[0034] After receiving the confirmation instruction, the outdoor data sending optocoupler of the current loop communication circuit sends a confirmation response instruction to the indoor main control panel.

[0035] In a fourth aspect, an embodiment of the present application provides a controller, comprising at least one processor and a memory connected to the at least one processor in communication; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the wake-up method of the second aspect or the starting method of the third aspect.

[0036] In a fifth aspect, an embodiment of the present application provides a main control panel, comprising the controller of the fourth aspect.

[0037] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores computer-executable instructions for causing a computer to execute the wake-up method of the second aspect or the starting method of the third aspect.

[0038] The air conditioning system, the wake-up method, the starting method, the controller and the main control panel of the embodiment have at least the following beneficial effects: the air conditioning system based on the current loop communication circuit is provided with a first switch on the indoor side, the L line and the S line of the current loop communication circuit are connected on the indoor side when the first switch is closed, the air conditioning system is provided with a second switch on the outdoor side, the N line of the current loop communication circuit-capacitor assembly of the first switch power supply-assisted wake-up branch-S line are connected on the outdoor side when the second switch is opened, therefore, when the outdoor main control panel needs to be woken up, the first switch is closed and the second switch is opened, an energy charging circuit from the N line of the current loop communication circuit-capacitor assembly of the first switch power supply-assisted wake-up branch-S line-the first switch-L line is formed, the capacitor assembly of the first switch power supply is charged, and then the voltage across the capacitor assembly of the first switch power supply is used to provide operating voltage for the main control chip of the outdoor main control panel, and then the outdoor unit is woken up; in the above energy charging circuit, the assisted wake-up branch and the first switch are connected in series for voltage division, so that the power required by the first switch is reduced, the first switch does not need to use large-size devices such as high-power relays, and therefore the space for arranging elements on the indoor main control panel can be saved, and the cost of the indoor main control panel can be lower.

[0039] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the description and the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1is a circuit diagram of an air conditioning system provided by an embodiment of the present application;

[0041] Figure 2 is a schematic diagram of current flow direction in a wake-up process provided by an embodiment of the present application;

[0042] Figure 3 is a schematic diagram of current flow direction in a communication process provided by an embodiment of the present application;

[0043] Figure 4 is a flow chart of a wake-up method provided by an embodiment of the present application;

[0044] Figure 5 is a flow chart of a wake-up method provided by another embodiment of the present application;

[0045] Figure 6 is a flow chart of a method for determining a preset closing duration provided by an embodiment of the present application;

[0046] Figure 7 is a flow chart of a wake-up method provided by another embodiment of the present application;

[0047] Figure 8 is a flow chart of a wake-up method provided by another embodiment of the present application;

[0048] Figure 9 is a flow chart of a start-up method provided by an embodiment of the present application;

[0049] Figure 10 is a flow chart of a start-up method provided by another embodiment of the present application;

[0050] Figure 11 is a schematic diagram of a controller provided by an embodiment of the present application. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments. At the same time, the steps or actions in the method description can also be sequentially changed or adjusted in a manner obvious to those skilled in the art. Therefore, the order in the specification and the drawings is only for clear description of an embodiment and does not mean a necessary order, unless otherwise stated that a certain order must be followed.

[0052] In the description of the present application, the meaning of one or more is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. is understood as not including the number, above, below, etc. is understood as including the number. If the first, second is described, it is only used to distinguish the technical features for the purpose, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0053] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any order or technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified.

[0054] The communication mode between the indoor unit and the outdoor unit in the variable frequency split air conditioner is mostly current loop communication, which has the characteristics of strong anti-interference ability and low cost. In order to realize low power standby, the indoor main control board generally reserves a large power relay for cutting off the power supply of the outdoor unit, so as to reduce the power consumption of the whole machine when standby is needed. If cooling or heating is needed in standby state, the indoor main control board controls the large power relay to attract, supplies power to the outdoor unit and wakes up the outdoor main control board.

[0055] With more and more additional functions of air conditioners, more elements need to be miniaturized in the limited space of the indoor main control board, but the large power relay bears a large power, and its volume and height are large, so it is difficult to miniaturize the relay.

[0056] Therefore, the embodiment provides an air conditioning system, a wake-up method, a start-up method, a controller and a main control board. The air conditioning system based on the current loop communication circuit is provided with a first switch at the indoor side. The L line and the S line of the current loop communication circuit are connected at the indoor side when the first switch is closed. The air conditioning system is provided with a second switch at the outdoor side. The N line of the current loop communication circuit-capacitor assembly of the first switch power supply-assisted wake-up branch-S line are connected at the outdoor side when the second switch is opened. Therefore, when the outdoor main control board needs to be woken up, the first switch is closed and the second switch is opened, so as to form an energy charging circuit from the N line of the current loop communication circuit-capacitor assembly of the first switch power supply-assisted wake-up branch-S line-first switch-L line, charge the capacitor assembly of the first switch power supply, and then use the voltage across the capacitor assembly of the first switch power supply to provide working voltage for the main control chip of the outdoor main control board, and then wake up the outdoor unit. In the above energy charging circuit, the assisted wake-up branch and the first switch are connected in series for voltage division, so that the power borne by the first switch is reduced, and the first switch does not need to select a large power relay or other large volume device, so that the space for arranging elements on the indoor main control board can be saved, and the cost of the indoor main control board can be lower.

[0057] The air conditioning system, the wake-up method, the start-up method, the controller and the main control board are described in detail below with reference to the drawings:

[0058] Referring to Figure 1 as shown, Figure 1 a circuit diagram of the air conditioning system provided by the embodiment.

[0059] The current loop communication circuit is connected to the AC input end of the first switching power supply 510 of the outdoor main control board through the L line and the N line on the outdoor side.

[0060] In some embodiments, the air conditioning system further comprises a first switch RY1 arranged on the indoor side and a second switch RY2 arranged on the outdoor side, wherein the first switch RY1 is connected to the L line and the S line of the current loop communication circuit, so that the current loop communication circuit can be controlled to be connected or disconnected through the switching state of the first switch RY1, and the second switch RY2 is arranged between the L line of the current loop communication circuit and the AC input end of the first switching power supply 510.

[0061] It can be understood that the current loop communication circuit in the embodiment includes an L line, an S line and an N line, wherein the L line is a live wire, the N line is a zero line, and the S line is a communication line. The power supply and communication of the indoor main control board and / or the outdoor main control board are realized through the cooperation of the first switch RY1, the second switch RY2, the L line, the S line and the N line. In the embodiment, the first switch RY1 and the second switch RY2 can be relays, photoelectric switches, transistors, etc. The selection of the first switch RY1 and the second switch RY2 is not limited in the embodiment.

[0062] Specifically, in the prior art, a high-power relay is generally arranged on the indoor main control board, which occupies too much space on the indoor main control board and may limit the local and design of other functional modules, further limiting the functions of the air conditioning system. In the embodiment, the first switch RY1 is a low-power relay, and the second switch RY2 is a high-power relay, i.e. the first switch RY1 on the indoor main control board can be a single-pole single-throw low-power small-size relay, a small-size solid-state relay or a high-voltage switch tube, etc., and the second switch RY2 on the outdoor main control board can be a single-pole single-throw relay, so as to save the space of the indoor main control board, reduce the space occupied by the first switch RY1 on the indoor main control board, further reduce the cost of the indoor main control board, and ensure the normal operation of the functions of the air conditioning system.

[0063] In some embodiments, the auxiliary wake-up branch 200 connects the S line of the current loop communication circuit and the capacitor assembly of the first switching power supply 510 on the outdoor side, wherein the auxiliary wake-up branch 200 comprises a unidirectional conducting element D4 and a voltage dividing resistor R1, the negative terminal of the unidirectional conducting element D4 is connected to the S line of the current loop communication circuit, the positive terminal of the unidirectional conducting element D4 is connected to one end of the voltage dividing resistor R1, the other end of the voltage dividing resistor R1 is connected to the connection point between the capacitor assembly of the first switching power supply 510 and the negative output terminal of the first rectifier bridge circuit, the unidirectional conducting element D4 plays a role of preventing reverse current flow, i.e., ensuring that the signal can only be transmitted from the auxiliary wake-up circuit to the S line, preventing reverse current transmission, and the voltage dividing resistor R1 is connected to the positive terminal of the unidirectional conducting element D4, thereby being able to step down the voltage flowing into the unidirectional conducting element D4 and reducing interference and noise in the auxiliary wake-up branch 200.

[0064] It should be noted that the unidirectional conducting element D4 and the voltage dividing resistor R1 can also provide protection for the auxiliary wake-up branch 200 in some cases, realize current limiting, and avoid damage to the auxiliary wake-up circuit due to excessive voltage or current.

[0065] It can be understood that the unidirectional conducting element D4 in the present embodiment can be a photodiode, a light-emitting diode, or the like, and the present embodiment does not make specific limitations.

[0066] In some embodiments, when the air conditioning system is just powered on, the first switch RY1 of the indoor main control board and the second switch RY2 of the outdoor main control board are in an open state, at this time, the L line and the N line do not form a loop, the main control chip 600 of the outdoor main control board is in a power-off state, only the indoor main control board is powered on, and the indoor main control board enters a standby state without user operation, so that low-power standby of the whole machine can be realized in this state.

[0067] When the user needs to cool or heat, the opening and closing states of the first switch RY1 and the second switch RY2 can be adjusted to switch the modes, and the specific operation process is as follows.

[0068] It can be understood that when the air conditioning system is in a standby state, the indoor main control board needs to wake up the outdoor main control board in a power-off state, at this time, the first switch RY1 is closed and the second switch RY2 is open, the current flows out from the N line, sequentially flows through the capacitor assembly of the first switching power supply 510, the auxiliary wake-up branch 200, the S line, the first switch RY1, and finally flows into the L line, so that the L line and the N line of the current loop communication circuit form a charging loop through the S line of the current loop communication circuit and the auxiliary wake-up branch 200 to charge the capacitor assembly of the first switching power supply 510, realizing charging of the capacitor assembly of the first switching power supply 510, and further enabling the voltage across the capacitor assembly of the first switching power supply 510 to start the outdoor main control board, realizing wake-up of the outdoor unit.

[0069] In some embodiments, the first switching power supply 510 includes a first rectifier bridge circuit and a first transformer, the alternating current signal is converted into a direct current signal through the first rectifier bridge circuit, thereby providing a stable direct current output, one end of the capacitor assembly of the first switching power supply 510 is connected to the positive output end of the first rectifier bridge circuit, the other end of the capacitor assembly of the first switching power supply 510 is connected to the negative output end of the first rectifier bridge circuit, thereby being able to filter the noise in the power supply through the capacitor assembly E5 in the first switching power supply 510, and the capacitor assembly can provide additional power filtering function, and the capacitor assembly of the first switching power supply 510 is connected to the primary side of the first transformer, the secondary side of the first transformer is connected to the main control chip 600 of the outdoor main control board, thereby being able to induce different voltage outputs according to the voltage change applied to the primary side, and the cooperation of the first rectifier bridge circuit and the first transformer can provide a stable power supply for the main control chip, ensure the normal operation of the main control chip, and ensure the correct transmission and stability of the signal.

[0070] It can be understood that the first transformer can convert one level to another level, that is, the voltage can be raised or lowered according to the turns ratio of the transformer. In the embodiment, one end of the capacitor assembly of the first switching power supply 510 is connected to the positive output end of the first rectifier bridge circuit, the other end of the capacitor assembly of the first switching power supply 510 is connected to the negative output end of the first rectifier bridge circuit, the first rectifier bridge circuit outputs voltage to the capacitor assembly of the first switching power supply 510, so that the capacitor assembly of the first switching power supply 510 can store and release electrical energy within the voltage cycle, and can filter out harmonics caused by nonlinear loads, effectively reduce harmonic components, improve the stability and reliability of the air conditioning system, and can change the voltage applied to the primary side of the first transformer, so that the secondary side of the first transformer can induce different voltage outputs, ensure the stability of the output voltage, and provide additional power filtering function, thereby being able to realize stable power supply for the main control chip, to ensure the normal operation of the main control chip and protect it from interference in the power supply.

[0071] It should be noted that the first rectifier bridge circuit in the embodiment includes a first bridge arm and a second bridge arm, a diode connected in each bridge arm is respectively arranged, and the input end of the first bridge arm in the first rectifier bridge circuit is connected with the N line, and the second switch RY2 is arranged between the L line and the input end of the second bridge arm.

[0072] Specifically, the first bridge arm includes the third diode D9 and the fourth diode D13, the anode of the third diode D9 is connected with the cathode of the fourth diode D13, the second bridge arm includes the fifth diode D10 and the sixth diode D14, the anode of the fifth diode D10 is connected with the cathode of the sixth diode D14, and the input end of the first bridge arm is between the third diode D9 and the fourth diode D13, and the input end of the second bridge arm is between the fifth diode D10 and the sixth diode D14.

[0073] Referring to Figure 2 as shown, Figure 2 The schematic diagram of the current flow direction of the wake-up process provided by the embodiment of the application.

[0074] It can be understood that, Figure 2 the solid arrow in the figure points to the current flow direction.

[0075] As can be known from Figure 2 , in the case that the first switch RY1 is closed and the second switch RY2 is opened, the current flows out from the N line, flows into the first bridge arm of the first rectifier bridge circuit, then flows into the capacitor assembly of the first switch power supply 510, charges the capacitor assembly of the first switch power supply 510 on the primary side of the first transformer, then flows into the voltage dividing resistor R1 and the unidirectional conduction element D4 in the auxiliary wake-up branch 200, since the first switch RY1 is closed at this time, the current can directly flow into the L line through the S line and the first switch RY1, thereby forming an energy charging loop from the N line of the current loop communication circuit-the first bridge arm of the first rectifier bridge circuit-the capacitor assembly of the first switch power supply 510-the auxiliary wake-up branch 200-the S line-the first switch RY1-the L line, and in this process, the capacitor assembly of the first switch power supply 510 is charged, and when the capacitor assembly is fully charged, the voltage across the capacitor assembly of the first switch power supply 510 is used to provide working voltage for the main control chip 600 of the outdoor main control board, so that the outdoor unit is woken up from the power-off mode.

[0076] In some embodiments, the first switch RY1 is arranged between the S line and the N line of the current loop communication circuit, the second switch RY2 is arranged between the N line and the input end of the first bridge arm of the first rectifier bridge circuit, and one end of the voltage dividing resistor R1 of the auxiliary wake-up branch 200 is connected to the S line of the current loop communication circuit, and the other end is connected to the positive end of the unidirectional conducting element D4, and the negative end of the unidirectional conducting element D4 is connected to the positive output end of the first rectifier bridge circuit. When the first switch RY1 is closed and the second switch RY2 is open, the current loop communication circuit forms a charging loop for charging the capacitor assembly of the first switching power supply 510 through the auxiliary wake-up branch 200 between the N line and the L line. Specifically, the current flows out from the N line, and since the first switch RY1 is closed at this time, it can directly flow into the S line through the first switch RY1, and then flow into the voltage dividing resistor R1 and the unidirectional conducting element D4 in the auxiliary wake-up branch 200, and then flow into the capacitor assembly E5 in the first switching power supply 510, and finally flow out through the first bridge arm of the first rectifier bridge circuit to the L line, forming a loop of N line-first switch RY1-S line-auxiliary wake-up branch 200-capacitor assembly E5 in the first switching power supply 510-first bridge arm-L line.

[0077] It can be understood that the guide conducting element in the embodiment can be a photodiode, a light-emitting diode, or the like. The embodiment is not specifically limited.

[0078] In some embodiments, when the charging of the capacitor assembly E5 in the first switching power supply 510 is completed, the first switching power supply 510 works, and at this time the outdoor unit is woken up from the power-off state, the main control chip 600 of the outdoor main control board will close the second switch RY2. When the first switch RY1 and the second switch RY2 are closed at the same time, the current will directly charge the capacitor assembly E5 in the first switching power supply 510 from the L line to the N line. At this time, the auxiliary wake-up branch 200 is similar to a short-circuit state, and almost no current flows through the channel of the auxiliary wake-up branch 200, that is, the entire air conditioning system can work normally when the first switch RY1 and the second switch RY2 are closed at the same time, but at this time the outdoor unit cannot communicate with the indoor unit because the current loop communication circuit is short-circuited by the first switch RY1. If the outdoor unit wants to communicate with the indoor unit, the first switch RY1 needs to be disconnected.

[0079] In some embodiments, the first switching power supply 510 further comprises a voltage conversion circuit 300, the secondary side of the first transformer is connected to the main control chip 600 of the outdoor main control board through the voltage conversion circuit 300, so as to adjust the voltage level of the output voltage of the secondary side of the first transformer, realize voltage conversion of the secondary side of the first transformer, and ensure the load-specific requirements of the output voltage. The voltage output end of the voltage conversion circuit 300 is connected to the main control chip 600 of the outdoor main control board, so as to realize stable power supply for the main control chip 600 of the outdoor main control board and meet the power supply requirements of the main control chip 600 of the outdoor main control board.

[0080] In some embodiments, the air conditioning system further comprises a communication power supply 400, the communication power supply 400 comprises L line and N line connected to the current loop communication circuit on the indoor side, for providing clamping voltage to the current loop communication circuit, wherein the communication power supply 400 comprises a first resistor R3, a second resistor R4, a first diode D3, a clamping capacitor E1 and a voltage stabilizing diode DZ2, the clamping capacitor E1 is arranged on the N line of the current loop communication circuit on the indoor side, the clamping capacitor E1, the voltage stabilizing diode DZ2 and the first resistor R3 are connected in parallel, the anode of the voltage stabilizing diode DZ2 is connected to the L line of the current loop communication circuit through the second resistor R4 and the first diode D3, the cathode of the voltage stabilizing diode DZ2 provides clamping voltage, the first resistor R3 and the second resistor R4 cooperate to divide voltage, realize voltage reduction of the output clamping voltage, and the voltage stabilizing diode DZ2 can stabilize the voltage after voltage reduction, so as to stably provide clamping voltage.

[0081] It can be understood that the first resistor R3, the second resistor R4, the first diode D3, the clamping capacitor E1 and the voltage stabilizing diode DZ2 in the embodiment form a half-wave voltage stabilizing power supply to generate 24V power supply, and the power supply is superimposed on the N line.

[0082] It should be noted that the anode of the first diode D3 is connected to the second resistor R4, and the cathode is connected to the L line of the current loop communication circuit, thereby realizing unidirectional conduction of current. The input voltage is reduced to the required voltage level through the voltage division effect of the first resistor R3 and the second resistor R4, and different output voltages can be achieved by adjusting the resistance ratio of the two resistors. The anode of the first diode D3 is connected to the connection point of the second resistor R4, which plays a role in preventing current from flowing in the opposite direction, determines the clamping direction, and prevents current from flowing back to the communication power supply 400. The clamping capacitor E1 is connected in parallel with the zener diode DZ2 and the second resistor R4, thereby providing a stable output voltage, wherein the clamping capacitor E1 acts as a storage device and can provide or absorb charge when the output voltage changes instantaneously to maintain the stability of the output voltage. The negative electrode of the zener diode DZ2 is connected to the connection point of the first resistor R3 and the second resistor R4, thereby providing a fixed clamping voltage to ensure that the output voltage is stable within a certain range. The stability of the clamping voltage is achieved through the cooperation of the various elements in the communication power supply 400.

[0083] It can be understood that the size of the clamping voltage output by the communication power supply 400 can be adjusted according to the ratio of the first resistor R3 and the second resistor R4 to meet the operating voltage requirements of the main circuit. The resistance values of the first resistor R3 and the second resistor R4 can be set by the user according to their needs, and this embodiment does not make specific limitations.

[0084] In some embodiments, the air conditioning system further comprises an indoor data receiving optocoupler IC3 and an indoor data sending optocoupler IC1 arranged on the indoor side, and an outdoor data receiving optocoupler IC4 and an outdoor data sending optocoupler IC2 arranged on the outdoor side, wherein the indoor main control board receives data through the indoor data receiving optocoupler IC3, and the indoor main control board sends data through the indoor data sending optocoupler IC1, and similarly, the outdoor main control board receives data through the outdoor data receiving optocoupler IC4, and sends data through the outdoor data sending optocoupler IC2.

[0085] Specifically, the anode of the light-emitting diode of the indoor data receiving optocoupler IC3 is connected to the S line of the current loop communication circuit, and the cathode is connected to the photosensitive component of the indoor data sending optocoupler IC1; one end of the indoor data sending optocoupler IC1 is connected to the cathode of the light-emitting diode of the indoor data receiving optocoupler IC3, and the other end is connected to the communication power supply 400; one end of the photosensitive component of the outdoor data sending optocoupler IC2 is connected to the S line of the current loop communication circuit, and the other end is connected to the cathode of the light-emitting diode of the outdoor data receiving optocoupler IC4; and the anode of the light-emitting diode of the outdoor data receiving optocoupler IC4 is connected to the N line of the current loop communication circuit. In the embodiment, the indoor master control board and the outdoor master control board are respectively provided with optocoupler components, so that the connection and communication of the indoor master control board and the outdoor master control board can be determined, and the optocoupler transmission is not affected by electromagnetic interference, thereby improving the anti-interference ability of the communication system and further improving the stability and safety of the air conditioning system.

[0086] It is worth noting that the indoor data receiving optocoupler IC3, the indoor data sending optocoupler IC1, the outdoor data receiving optocoupler IC4, and the outdoor data sending optocoupler IC2 in the embodiment can form a communication loop, and the power supply of the communication loop is a 24V power supply generated by a half-wave voltage stabilizing power supply composed of a first resistor R3, a second resistor R4, a first diode D3, a clamping capacitor E1, and a voltage stabilizing diode DZ2, and the power supply is superimposed on the N line.

[0087] In some embodiments, during the communication between the indoor master control board and the outdoor master control board, after the outdoor master control board is woken up, the outdoor master control board will attract the outdoor data receiving optocoupler IC4 and the outdoor data sending optocoupler IC2, and wait to receive the command sent by the indoor master control board. At this time, the indoor master control board attracts the indoor data sending optocoupler IC1 and the indoor data receiving optocoupler IC3, sends instructions through the indoor data sending optocoupler IC1, and the outdoor master control board receives the instructions sent by the indoor master control board through the outdoor data receiving optocoupler IC4, and returns the corresponding response instructions through the outdoor data sending optocoupler IC2. The indoor master control board receives the response instructions sent by the outdoor master control board through the indoor receiving optocoupler, so as to determine the wake-up situation or working situation of the outdoor master control board through the change of the optocoupler, realize the detection of the working state of the outdoor master control board, and the current flow direction in the communication process is as follows.

[0088] Referring to Figure 3 , the Figure 3 is a schematic diagram of the current flow direction in the communication process provided by the embodiment of the present application.

[0089] It can be understood that the Figure 3 solid arrow points to the direction of current flow.

[0090] In some embodiments, the current loop communication circuit connects the AC input end of the second switching power supply 520 of the indoor main control board through the L line and the N line on the indoor side.

[0091] In some embodiments, after the outdoor main control board is woken up, the outdoor main control board will attract the outdoor data receiving optocoupler IC4 and wait to receive the command of the indoor main control board. At this time, the current flow of the communication process is as shown in the figure. After the current flows out of the clamping capacitor E1 of the communication power supply 400, it flows through the N line, and then flows from the outdoor data receiving optocoupler IC4 to the outdoor data sending optocoupler IC2, and then flows into the 0V voltage point of the indoor data receiving optocoupler IC3 from the indoor data sending optocoupler IC1, forming a loop of clamping capacitor E1-N line-outdoor data receiving optocoupler IC4-outdoor data sending optocoupler IC2-indoor data receiving optocoupler IC3-indoor data sending optocoupler IC1-0V voltage point, completing a communication process. Figure 3

[0092] It should be noted that in the process of communication between the outdoor main control board and the indoor main control board, due to the blockage of the one-way conduction element D4 in the auxiliary wake-up branch 200, the current will not flow into the first rectifier bridge circuit through the auxiliary wake-up branch 200, so this method can save a relay, or avoid using a double-pole or single-pole double-throw relay, thereby greatly reducing the cost.

[0093] In some embodiments, the first switching power supply 510 further includes a second diode D5, the positive electrode of the secondary side of the first transformer is connected to the positive electrode of the second diode D5, and the negative electrode of the second diode D5 is connected to the main control chip 600 of the outdoor main control board through the voltage conversion circuit 300, thereby limiting the direction of current flow and protecting the voltage conversion circuit 300 from damage under reverse voltage, overvoltage or overcurrent conditions.

[0094] In some embodiments, the second switching power supply 520 includes a second rectifier bridge circuit and a second transformer, one end of the capacitor assembly of the second switching power supply 520 is connected to the positive electrode output end of the second rectifier bridge circuit, the other end of the capacitor assembly of the second switching power supply 520 is connected to the negative electrode output end of the second rectifier bridge circuit, and the capacitor assembly of the second switching power supply 520 is connected to the primary side of the second transformer, and the secondary side of the second transformer is connected to the main control chip of the indoor main control board, so that the second rectifier bridge circuit can convert the AC signal into a DC signal, the capacitor assembly is connected to the positive electrode output end and the negative electrode output end of the second rectifier bridge circuit, so that the voltage fluctuation can be smoothed, and the primary side of the second transformer is connected to the capacitor assembly of the second switching power supply 520 to determine the voltage across the capacitor assembly, so that the secondary side of the second transformer can induce different voltage outputs according to the voltage change of the primary side, thereby realizing stable power supply to the main control chip of the indoor main control board.

[0095] ​It should be noted that the second rectifier bridge in the embodiment includes a third bridge arm and a fourth bridge arm, a diode connected in each bridge arm, and the input end of the third bridge arm in the second rectifier bridge circuit is connected with the N line, and the first switch RY1 is arranged between the S line and the input end of the fourth bridge arm.

[0096] Specifically, the third bridge arm includes a seventh diode D7 and an eighth diode D11, the anode of the seventh diode D7 is connected with the cathode of the eighth diode D11, the fourth bridge arm includes a ninth diode D8 and a twelfth diode D12, the anode of the ninth diode D8 is connected with the cathode of the twelfth diode D12, and the input end of the third bridge arm is between the seventh diode D7 and the eighth diode D11, and the input end of the fourth bridge arm is between the ninth diode D8 and the twelfth diode D12.

[0097] Those skilled in the art can understand that, Figures 1-3 The schematic diagram shown in FIG. 1 is not a limitation on the embodiments of the present application, and can include more or fewer components than the schematic diagram, or combine certain components, or different component arrangements, and the wake-up control method in the embodiments will be specifically described below.

[0098] Referring to Figure 4 , Figure 4 is a flowchart of the wake-up method provided by an embodiment of the present application. The application is applicable to, but not limited to Figure 1 the indoor main control board of the air conditioning system in FIG. 1, including but not limited to steps S101 to S102.

[0099] In step S101, in response to the outdoor unit wake-up instruction, the first switch RY1 is controlled to be closed to form a charging circuit for charging the capacitor assembly of the first switching power supply 510.

[0100] In some embodiments, when the air conditioning system is just powered on, the first switch RY1 and the second switch RY2 in the air conditioning system are in an open state, in response to the outdoor unit wake-up instruction, the first switch RY1 is controlled to be closed, at this time, the N line-current loop communication circuit-S line-auxiliary wake-up branch 200-capacitor assembly E5 of the first switching power supply 510 of the N line is connected, that is, a charging circuit from the N line-current loop communication circuit-capacitor assembly E5 of the first switching power supply 510-auxiliary wake-up branch 200-S line-first switch RY1-L line is formed, the capacitor assembly E5 of the first switching power supply 510 is charged, and then the voltage across the capacitor assembly of the first switching power supply 510 is used to provide a working voltage for the main control chip 600 of the outdoor main control board, and then the outdoor unit is woken up.

[0101] It should be noted that when the air conditioning system is powered on, the first switch RY1 and the second switch RY2 are both in an open state, so after responding to the outdoor unit wake-up instruction, only the first switch RY1 needs to be controlled to be closed, and the second switch RY2 remains in an open state.

[0102] In step S102, it is determined that the closing duration of the first switch RY1 reaches the preset closing duration, and the first switch RY1 is controlled to be opened.

[0103] In some embodiments, when the charging of the capacitor component E5 in the first switch power supply 510 is completed, the first switch power supply 510 works, at this time the outdoor unit is woken up from the power-off state, and the main control chip 600 of the outdoor main control board will close the second switch RY2. In the case that the first switch RY1 and the second switch RY2 are closed at the same time, the current will directly charge the capacitor component E5 in the first switch power supply 510 from the L line to the N line, at this time the auxiliary wake-up branch 200 is similar to a short-circuit state, and almost no current flows through the channel of the auxiliary wake-up branch 200, that is, the entire air conditioning system can work normally in the case that the first switch RY1 and the second switch RY2 are closed at the same time, but at this time the outdoor unit cannot communicate with the indoor unit because the current loop communication circuit is short-circuited by the first switch RY1. If the outdoor unit wants to communicate with the indoor unit, the first switch RY1 needs to be opened. In order not to affect the communication function between the indoor main control board and the outdoor main control board, the embodiment of the present application needs to calculate the closing duration of the first switch RY1 after the first switch RY1 is controlled to be closed, and then determine whether the closing duration of the first switch RY1 reaches the preset closing duration. When it is determined that the closing duration of the first switch RY1 reaches the preset closing duration, the first switch RY1 is controlled to be opened, so as to avoid affecting the communication function between the indoor main control board and the outdoor main control board.

[0104] It should be noted that when the closing duration of the first switch RY1 does not reach the preset closing duration, the first switch RY1 and the second switch RY2 continue to maintain the closed state.

[0105] Referring to FIG. 1, Figure 5 Figure 5 is a flowchart of a wake-up method provided by another embodiment of the present application. It includes but is not limited to steps S201 to S203.

[0106] In step S201, the power-off moment of the outdoor unit and the stop moment when the outdoor unit stops working are recorded.

[0107] In step S202, the actual power-off duration is determined according to the time difference between the power-off moment and the stop moment.

[0108] In step S203, the preset closing duration is determined according to the actual power-off duration and the complete discharge duration of the capacitor component of the first switch power supply 510. ​

[0109] In steps S201 to S203 of some embodiments, in the process of designing the air conditioning system, in order to reduce the cost of the indoor main control board and the outdoor main control board and reduce the volume of the indoor main control board, the relay on the indoor main control board and the outdoor main control board is generally selected as a low-power relay. In order to reduce the impact current on the large capacitor, the current will be limited by the current-limiting resistor R1 in the auxiliary wake-up branch 200 during the charging process, so the current flowing out will not be too large. In order to shorten the length of the entire wake-up process and enable the system to respond faster, the present embodiment records the power-down time of the outdoor unit and the stop time when the outdoor unit stops working, and then determines the actual power-down length according to the time difference between the power-down time and the stop time, that is, the length of time from the start of power-down of the outdoor unit to the complete stop of work. Finally, the preset closing length is determined according to the actual power-down length and the complete discharge length of the capacitor component of the first switching power supply 510, which can make the system recover to the normal operating state faster, improve the stability and reliability of the system, and shorten the length of the wake-up process of the outdoor unit as a whole.

[0110] Referring to Figure 6 , it is provided by an embodiment of the present application. Determining the preset closing length includes but is not limited to steps S301 to S302. Figure 6

[0111] It should be noted that the auxiliary wake-up branch 200 includes a voltage dividing resistor R1, and the capacitor component of the first switching power supply 510 in the charging circuit is connected in series with the voltage dividing resistor R1.

[0112] Step S301, determining the power consumption ratio according to the actual power-down length and the complete discharge length.

[0113] Step S302, determining the preset closing length according to the power consumption ratio, the resistance value of the voltage dividing resistor R1, the rated voltage and the capacitance of the capacitor component of the first switching power supply 510.

[0114] In steps S301 to S302 of some embodiments, in the process of determining the preset closing length according to the actual power-down length and the complete discharge length of the capacitor component of the first switching power supply 510, first, the power consumption ratio is determined according to the actual power-down length and the complete discharge length, so that it can be known how much power is consumed by the outdoor unit before it stops working. The outdoor unit state and power consumption can be determined by the power consumption ratio, and finally the preset closing length is determined according to the power consumption ratio, the resistance value of the voltage dividing resistor R1, the rated voltage and the capacitance of the capacitor component of the first switching power supply 510, so that the voltage fluctuation and instability of the system when the outdoor unit stops working can be reduced, the stable operation of the entire air conditioning system can be ensured, and the risk of failure caused by circuit problems can be reduced.

[0115] ​It should be noted that the time used by the outdoor unit from the power failure to the complete non-working time is T off in the embodiment, for example, the outdoor unit is powered off for T1 seconds, and the power consumption ratio of the outdoor unit is T1 / T off. The closing time of the first switch RY1 is T charge = -the voltage dividing resistor R1*E5*ln(1-(T1 / T off)*Vmax / Vmax), wherein Vmax is the rated voltage of the capacitor assembly of the first switch power supply 510, that is, the maximum voltage across the capacitor assembly, E5 is the capacitance of the capacitor assembly of the first switch power supply 510, and the voltage dividing resistor R1 is the resistance value of the voltage dividing resistor R1. After determining the preset closing time, the first switch RY1 is controlled to be closed for T charge seconds and then opened, so as to avoid affecting the communication between the indoor main control board and the outdoor main control board.

[0116] Referring to Figure 7 , the embodiment provides a flowchart of a wake-up method. The steps include but are not limited to steps S401 to S402. Figure 7

[0117] It should be noted that the steps S401 to S402 occur after the first switch RY1 is controlled to be opened.

[0118] In step S401, an acknowledgement instruction is sent to the outdoor main control board through the current loop communication circuit, and an acknowledgement response instruction sent by the outdoor main control board is waited.

[0119] In step S402, if the acknowledgement response instruction is not received within the response time threshold, the first switch RY1 is controlled to be closed again.

[0120] In steps S401 to S402 of some embodiments, due to more additional functions of the air conditioning system, the outdoor unit may fail to wake up or the air conditioner may have abnormal functions. In the embodiment, after the first switch RY1 is controlled to be opened, an acknowledgement instruction is sent to the outdoor main control board through the current loop communication circuit, so as to determine whether the function of the outdoor main control board is normal or whether the outdoor main control board is electrified, and an acknowledgement response instruction sent by the outdoor main control board is waited. If the acknowledgement response instruction is not received within the response time threshold, the first switch RY1 is controlled to be closed again, that is, step S101 is repeated, so as to detect the outdoor main control board, ensure that the air conditioning system can normally operate, and improve the stability and reliability of the air conditioning system.

[0121] In some embodiments, if the acknowledgement response instruction is received within the response time threshold, the wake-up process is ended.

[0122] It can be understood that the response time threshold in the embodiment can be set by the user according to the needs, for example, 500 milliseconds, 300 milliseconds, 550 milliseconds, and the like, and the embodiment does not make specific limitation.​

[0123] Referring to Figure 8 illustrated, Figure 8 is a flowchart of the wake-up method provided by another embodiment of the present application. It includes but is not limited to steps S501 to S502.

[0124] Step S501, record the number of failures in the case of not receiving the confirmation response instruction within the response time threshold.

[0125] Step S502, issue a fault reminder when the number of failures reaches the preset number.

[0126] In steps S501 to S502 of some embodiments, after sending the confirmation instruction to the outdoor master control panel through the current loop communication circuit, if the confirmation response instruction is not received within the response time threshold, the number of failures needs to be recorded, and the confirmation instruction continues to be sent to the outdoor master control panel through the current loop communication circuit, and the number of failures is updated in the case of not receiving the confirmation response instruction. Compare the number of failures with the preset number, and issue a fault reminder when the number of failures reaches the preset number, so that the staff can discover and handle the fault or abnormality of the outdoor master control panel in time, reduce the downtime and maintenance cost of the air conditioning system, and improve the maintainability and maintenance efficiency of the air conditioning system.

[0127] It should be noted that when the number of failures does not reach the preset number, the confirmation instruction needs to be sent to the outdoor master control panel through the current loop communication circuit, wherein the preset number can be set by the user according to the user's needs, for example, set to three times, four times, five times, etc. This embodiment does not make specific limitations.

[0128] Referring to Figure 9 illustrated, Figure 9 is a flowchart of the start-up method provided by an embodiment of the present application. It is applied to but not limited to Figure 1 the outdoor master control panel of the air conditioning system in , including but not limited to step S601.

[0129] Step S601, close the second switch RY2 after power-on wake-up.

[0130] In some embodiments, the indoor master control panel controls the first switch RY1 to be closed in response to the outdoor unit wake-up instruction of the outdoor master control panel, to form a charging circuit to charge the capacitor assembly of the first switch power supply 510, and the outdoor master control panel closes the second switch RY2 after determining power-on wake-up, thereby completing the entire wake-up process.

[0131] Referring to Figure 10 illustrated, Figure 10 is a flowchart of the start-up method provided by another embodiment of the present application. It includes but is not limited to steps S701 to S702.

[0132] It should be noted that steps S701 to S702 occur after the second switch RY2 is closed.

[0133] Step S701, turn on the outdoor data receiving optocoupler IC4 of the current loop communication circuit, and wait to receive the confirmation instruction sent by the indoor main control board.

[0134] Step S702, after receiving the confirmation instruction, send a confirmation response instruction to the indoor main control board through the outdoor data sending optocoupler IC2 of the current loop communication circuit.

[0135] In steps S701 to S702 of some embodiments, after the second switch RY2 is closed, the outdoor main control board will attract the outdoor data receiving optocoupler IC4 and the outdoor sending optocoupler, that is, turn on the outdoor data receiving optocoupler IC4 and the outdoor data sending optocoupler IC2 of the current loop communication circuit, and wait to receive the command sent by the indoor main control board. At this time, the current flows as shown in the figure. Figure 3 After receiving the confirmation instruction, the outdoor data sending optocoupler IC2 of the current loop communication circuit sends a confirmation response instruction to the indoor main control board in this embodiment, to return the response instruction to the indoor main control board, so as to realize the communication process between the indoor main control board and the outdoor main control board, ensure that the air conditioning system can operate normally, and improve the stability and reliability of the air conditioning system.

[0136] In order to more clearly and clearly explain the above-mentioned air conditioning system, wake-up method, start-up method, controller and main control board, the following specific examples are given.

[0137] Example one:

[0138] Example one is a specific description of the wake-up method of the air conditioning system. Based on the structure of the air conditioning system in Figure 1 , the wake-up method is described in detail.

[0139] In some embodiments, a current loop communication circuit is provided between the indoor main control board and the outdoor main control board of the air conditioning system. The current loop communication circuit is connected to the AC input end of the first switch power supply 510 of the outdoor main control board through L line and N line on the outdoor side. The air conditioning system further comprises an indoor data receiving optocoupler IC3, an indoor data sending optocoupler IC1, an outdoor data receiving optocoupler IC4 and an outdoor data sending optocoupler IC2. The indoor data receiving optocoupler IC3, the indoor data sending optocoupler IC1, the outdoor data receiving optocoupler IC4 and the outdoor data sending optocoupler IC2 can form a communication loop. The power supply of the communication loop comes from the 24V power supply generated by the half-wave voltage stabilizing tube voltage stabilizing power supply composed of the first resistor R3, the second resistor R4, the first diode D3, the clamping capacitor E1 and the voltage stabilizing diode DZ2, and the power supply is superimposed on the N line.

[0140] It is worth noting that in this embodiment, the indoor main control board and the outdoor main control board are connected by three wires, namely L line, N line and S line. The indoor main control board has L1, N1 and S1 terminals, and the outdoor main control board has L2, N2 and S2 terminals.

[0141] This embodiment uses the first switch RY1 and the second switch RY2 as relays as an example for explanation. Specifically, the relay used on the indoor main control board is a single-pole single-throw low-power small-volume relay, which can reduce the space of the indoor main control board and reduce costs. The outdoor main control board only uses one single-pole single-throw high-power relay, which can also reduce costs.

[0142] Based on the above description of the air conditioning system's structure, the wake-up process of the air conditioning system will be explained in detail below.

[0143] When the power is first applied, the second switch RY2 on the outdoor main control board is open, and L2 and N2 do not form a circuit. Therefore, the outdoor main control board is not powered, and only the indoor main control board is powered. Moreover, the indoor main control board enters standby mode when there is no user operation, so low power standby can be achieved in this state.

[0144] During the wake-up process, the capacitor component E5 in the first switching power supply 510 is first charged. Specifically, when the user needs cooling or heating, the indoor main control board needs to wake up the outdoor main control board, which is in a power-off state. The indoor main control board then activates the first switch RY1. At this time, the direction of current flow is as follows: Figure 2 As shown, the current flows from N1 into N2, passes through D9 in the first bridge arm of the first rectifier bridge circuit, charges the capacitor component E5 in the first switching power supply 510, and then flows through the DC_N line into the auxiliary wake-up branch 200. After passing through the voltage divider resistor R1 and the unidirectional conducting element D4, it flows from S2 into S1, and finally flows into L1 through the closed channel of the first switch RY1, completing the charging of the capacitor component E5 in the electrolytic first switching power supply 510. After that, the switching power supply works. When the outdoor unit is woken up from the power-off state, it will first pull the second switch RY2. After the second switch RY2 is pulled, the current will directly flow from L2 to N2 to charge the capacitor component E5 in the first switching power supply 510. The auxiliary wake-up branch 200 is similar to a short-circuited state. At this time, almost no current flows through the auxiliary wake-up branch 200. The second switch RY2 and the first switch RY1 are pulled at the same time, and the entire circuit can work normally.

[0145] Next, this example determines the disconnection time of the first switch RY1. During the period when the first switch RY1 is engaged, although the outdoor unit is awakened, it cannot communicate with the indoor unit because the indoor / outdoor communication link is short-circuited by the first switch RY1. The first switch RY1 needs to be disconnected to enable communication.

[0146] In order to reduce the cost and size of the relay in design, the relay is generally selected to be a low-power relay, and in order to reduce the impact current on a large capacitor. During the charging process, the current will be limited by the current-limiting resistor R1 and will not be too large. In order to shorten the time length of the entire wake-up process and enable the system to respond faster, the principle of "consumption is charged" is followed to shorten the time of closing the first switch RY1 during the charging process. For example, the indoor control calculates that the time used by the outdoor unit from power failure to complete non-operation is T_off, T_off is the theoretical time, which represents the time required for the capacitor to be completely discharged. Assuming that the outdoor unit actually powers off for T1 seconds, the proportion of the power consumed by the outdoor unit at this time is T1 / T_off. The closing time of the first switch RY1 relay is T_charge = -R1*E5*ln(1-(T1 / T_off)*Vmax / Vmax), wherein Vmax is the maximum voltage across the capacitor component E5 in the first switch power supply 510, E5 is the capacitance of the capacitor component E5 in the first switch power supply 510, and R1 is the resistance value of the resistor voltage dividing resistor R1. T_charge is calculated to control the first switch RY1 to be closed for T_charge seconds and then disconnected.

[0147] Finally, the example confirms the wake-up process. Once the outdoor unit is woken up from the power failure state, the outdoor data receiving optocoupler IC4 is turned on at the first time to receive the command sent by the indoor unit. The indoor unit will disconnect the first switch RY1 after a delay of T_charge seconds, and send a command to the outdoor main control board through the current loop to confirm whether the outdoor main control board has been woken up and whether the function is normal.

[0148] If the indoor main control board receives the reply ACK of the outdoor main control board within 500 ms, the entire wake-up function is ended. If not, the above step is repeated three times, and if no ACK is received for three times, an alarm is reported.

[0149] In some embodiments, when the user needs to shut down, the indoor main control board sends a command to the outdoor main control through the indoor data sending optocoupler IC1. After receiving the command, the outdoor main control cuts off the second switch RY2 to achieve power failure.

[0150] Example Two:

[0151] Example Two is a specific description of the communication process of the indoor main control board and the outdoor main control board. Based on the structure of the air conditioning system in Figure 1 , the communication process is described in detail.

[0152] After the outdoor main control board is woken up, the outdoor data receiving optocoupler IC4 is attracted, and waits to receive the command of the indoor main control. The current flow of the communication process at this time is as follows: Figure 3In the process of communication between the indoor master control board and the outdoor master control board, the current flows from the 0V voltage point of the indoor data receiving optocoupler IC3 to the 0V voltage point of the indoor data sending optocoupler IC1, and forms a loop, thereby completing a communication process.

[0153] It can be understood that in the process of communication between the indoor master control board and the outdoor master control board, the current cannot flow into the first rectifier bridge circuit through the auxiliary wake-up branch 200 due to the blocking of the unidirectional conduction element D4, and therefore the method can save a relay or avoid using a double-pole or single-pole double-throw relay, thereby greatly reducing the cost.

[0154] Figure 11 As shown in the figure, Figure 11 is a schematic diagram of a controller 1000 provided by an embodiment of the present application.

[0155] The controller 1000 provided by the embodiment of the present application includes at least one processor and a memory connected in communication with the at least one processor; the memory stores instructions capable of being executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the wake-up method or the start-up method of the above-described embodiment.

[0156] The controller 1000 provided by the embodiment of the present application includes one or more processors 1001 and a memory 1002, Figure 11 for example, one processor 1001 and one memory 1002.

[0157] The processor 1001 and the memory 1002 can be connected through a bus or other means, Figure 11 for example, connected through a bus.

[0158] The memory 1002 is a kind of non-transient computer readable storage medium, and can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory 1002 can include a high-speed random access memory, and can also include a non-transient memory, such as at least one magnetic disk storage device, a flash memory device, or other non-transient solid-state memory device. In some embodiments, the memory 1002 can optionally include a memory 1002 remotely arranged with respect to the processor 1001, and these remote memories can be connected to the controller 1000 through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0159] In some embodiments, the present embodiment also provides a master control board including the controller as described above, Figure 11 and the controller 1000 is used to execute the above-described wake-up method or start-up method.

[0160] It is worth noting that since the master control board of the embodiment of the present application comprises the controller of the above-mentioned embodiment, the specific implementation and technical effects of the master control board of the embodiment of the present application can refer to the specific implementation and technical effects of the wake-up method or the starting method of any one of the above-mentioned embodiments, and the embodiment will not be described here.

[0161] Those skilled in the art can understand that all or some steps in the method disclosed above can be implemented as software, firmware, hardware and appropriate combinations thereof. Some or all physical components can be implemented as software executed by a processor such as a central processing unit, a digital signal processor or a microprocessor, or as hardware, or as an integrated circuit such as an application specific integrated circuit. Such software can be distributed on a computer readable medium, which can include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. In addition, it is known to those skilled in the art that communication media generally includes computer readable instructions, data structures, program modules or other data in modulated data signals such as carrier waves or other transmission mechanisms, and can include any information delivery medium.

[0162] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the above-mentioned embodiments. Those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. An air conditioning system, characterized by, The current loop communication circuit is connected to the AC input end of the first switching power supply of the outdoor main control board through L line and N line on the outdoor side. The first switch is connected to the L line and S line of the current loop communication circuit on the indoor side. The second switch is arranged between the L line of the current loop communication circuit and the AC input end of the first switching power supply on the outdoor side. The auxiliary wake-up branch is connected to the S line of the current loop communication circuit and the capacitor assembly of the first switching power supply on the outdoor side.

2. The air conditioning system of claim 1, wherein, When the first switch is closed and the second switch is opened, the L line and N line of the current loop communication circuit form a charging loop with the S line of the current loop communication circuit and the auxiliary wake-up branch for the capacitor assembly of the first switching power supply to start the outdoor main control board by using the voltage across the capacitor assembly of the first switching power supply.

3. The air conditioning system of claim 2, wherein, The first switching power supply includes a first rectifier bridge circuit and a first transformer.

4. The air conditioning system of claim 2, wherein, One end of the capacitor assembly of the first switching power supply is connected to the positive output end of the first rectifier bridge circuit.

5. The air conditioning system of claim 1, wherein, The other end of the capacitor assembly of the first switching power supply is connected to the negative output end of the first rectifier bridge circuit.

6. The air conditioning system of claim 5, wherein, The capacitor assembly of the first switching power supply is connected to the primary side of the first transformer.

7. The air conditioning system according to any one of claims 1 to 6, wherein The secondary side of the first transformer is connected to the main control chip of the outdoor main control board.

8. A method of waking up, characterized by, The auxiliary wake-up branch includes a unidirectional conduction element and a voltage dividing resistor. The negative end of the unidirectional conduction element is connected to the S line of the current loop communication circuit. The positive end of the unidirectional conduction element is connected to one end of the voltage dividing resistor.

9. The wake-up method of claim 8, wherein, The other end of the voltage dividing resistor is connected to the connection point of the capacitor assembly of the first switching power supply and the negative output end of the first rectifier bridge circuit. The first switching power supply further includes a voltage conversion circuit. The secondary side of the first transformer is connected to the main control chip of the outdoor main control board through the voltage conversion circuit. The communication power supply includes the L line and N line of the current loop communication circuit on the indoor side for providing clamping voltage to the current loop communication circuit. The communication power supply includes a first resistor, a second resistor, a first diode, a clamping capacitor, and a voltage stabilizing diode. The clamping capacitor is arranged on the N line of the current loop communication circuit on the indoor side. The clamping capacitor, the voltage stabilizing diode, and the first resistor are connected in parallel. The positive electrode of the voltage stabilizing diode is connected to the L line of the current loop communication circuit through the second resistor and the first diode. The negative electrode of the voltage stabilizing diode provides clamping voltage. The first switch is a low-power relay, and the second switch is a high-power relay. The indoor main control board applied to the air conditioning system of any one of claims 1 to 7. The wake-up method includes: In response to the outdoor unit wake-up instruction, the first switch is controlled to be closed to form the charging loop for charging the capacitor assembly of the first switching power supply. When the closing duration of the first switch reaches the preset closing duration, the first switch is controlled to be opened. The wake-up method further includes: record a power-off time of the outdoor unit and a stop time of the outdoor unit stopping working; determine an actual power-off duration according to a time difference between the power-off time and the stop time; determine the preset closing duration according to the actual power-off duration and a complete discharge duration of a capacitor assembly of the first switching power supply.

10. The wake-up method of claim 9, wherein, The auxiliary wake-up branch includes a voltage dividing resistor, and the capacitor assembly of the first switching power supply in the charging circuit is connected in series with the voltage dividing resistor; the determination of the preset closing duration according to the actual power-off duration and the complete discharge duration of the capacitor assembly of the first switching power supply includes: determining an electricity consumption ratio according to the actual power-off duration and the complete discharge duration; determining the preset closing duration according to the electricity consumption ratio, a resistance value of the voltage dividing resistor, a rated voltage and a capacitance of the capacitor assembly of the first switching power supply.

11. The wake-up method of claim 8, wherein, After the first switch is controlled to be turned off, the wake-up method further includes: sending a confirmation instruction to the outdoor main control board through the current loop communication circuit and waiting for a confirmation response instruction sent by the outdoor main control board; if the confirmation response instruction is not received within a response duration threshold, controlling the first switch to be closed again.

12. The wake-up method of claim 11, wherein, The wake-up method further includes: recording a failure number of times in the case that the confirmation response instruction is not received within the response duration threshold; when the failure number of times reaches a preset number of times, issuing a fault reminder.

13. A method of starting, characterized by An outdoor main control board applied to the air conditioning system of any one of claims 1 to 7, the starting method including: closing the second switch after power-on wake-up.

14. The starting method of claim 13, wherein, After the second switch is closed, the starting method further includes: turning on an outdoor data receiving optocoupler of the current loop communication circuit and waiting for receiving a confirmation instruction sent by the indoor main control board; after receiving the confirmation instruction, sending a confirmation response instruction to the indoor main control board through an outdoor data sending optocoupler of the current loop communication circuit.

15. A controller characterized by comprising: The controller includes at least one processor and a memory connected in communication with the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the wake-up method of any one of claims 8 to 12 or execute the starting method of any one of claims 13 to 14.

16. A master control board, characterized by The controller includes the controller of claim 15.

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