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. The air conditioning system comprises a direct current power supply, an S line connected with a current loop communication circuit on the indoor side and a reference potential point; the first switch is connected with an N line of the current loop communication circuit and a reference potential point on the indoor side; the second switch 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; and the auxiliary awakening branch circuit is used for forming an energy charging loop for charging the capacitor assembly of the first switching power supply between the direct current power supply and the reference potential point through the S line and the auxiliary awakening branch circuit under the condition that the first switch is switched on and the second switch is switched off, 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 direct-current power supply is adopted in the energy charging loop to provide the direct-current voltage through the S line, 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 conditioner system, a wake-up method, a start-up method, a controller and a main control board. BACKGROUND

[0002] In a variable frequency split air conditioner, the communication mode between the indoor unit and the outdoor unit is mostly current loop communication. This communication mode 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 conditioner 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 conditioner system, wherein a current loop communication circuit is arranged between an indoor main control board and an outdoor main control board of the air conditioner 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 conditioner system further comprises:

[0006] a direct current power supply connected to an S line and a reference potential point of the current loop communication circuit on the indoor side;

[0007] a first switch connected to the N line and the reference potential point of the current loop communication circuit on the indoor side;

[0008] a second switch 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;

[0009] an auxiliary wake-up branch 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, a charging loop for charging the capacitor assembly of the first switching power supply is formed between the direct current power supply and the reference potential point through the S line 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.

[0010] In some embodiments, the first switching power supply includes a first rectifier bridge circuit and a first transformer, the first rectifier bridge circuit is connected to a primary side of the first transformer, a capacitor component of the first switching power supply is connected in parallel with a secondary side of the first transformer, a connection point of the capacitor component of the first switching power supply and the secondary side of the first transformer is connected to a main control chip of the outdoor main control board, and the primary side and the secondary side of the first transformer are grounded.

[0011] In some embodiments, the first switching power supply further includes a first diode, a positive electrode of the secondary side of the first transformer is connected to a positive electrode of the first diode, and a negative electrode of the first diode is connected to a negative electrode of the secondary side of the first transformer through the capacitor component of the first switching power supply.

[0012] In some embodiments, the auxiliary wake-up branch includes a unidirectional conduction element and a voltage dividing resistor, a positive direction end of the unidirectional conduction element is connected to an S line of the current loop communication circuit, a negative direction 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 the negative electrode of the first diode.

[0013] In some embodiments, the air conditioning system further includes an overcurrent protection circuit, the overcurrent protection circuit includes a thermistor and a first voltage stabilizing diode, the thermistor is connected in series between the auxiliary wake-up branch and the negative electrode of the first diode, a negative electrode of the first voltage stabilizing diode is connected to the negative electrode of the first diode, and a positive electrode of the first voltage stabilizing diode is connected to a negative electrode of the secondary side of the first transformer.

[0014] In some embodiments, the first switching power supply further includes a voltage conversion circuit, a connection point of the capacitor component of the first switching power supply and the secondary side of the first transformer is connected to a voltage input end of the voltage conversion circuit, and a voltage output end of the voltage conversion circuit is connected to the main control chip of the outdoor main control board.

[0015] In some embodiments, the current loop communication circuit is connected to a second switching power supply of an indoor main control board through an L line and an N line on an indoor side, the second switching power supply includes a second rectifier bridge circuit and a second transformer, the second rectifier bridge circuit is connected to a primary side of the second transformer, and a secondary side of the second transformer is connected to the direct current power supply.

[0016] In some embodiments, the direct current power supply includes a clamping capacitor and a second diode, a positive electrode of the secondary side of the second transformer is connected to a positive electrode of the second diode, one end of the clamping capacitor is connected to a negative electrode of the second diode as a positive electrode of the direct current power supply, and the other end of the clamping capacitor is connected to a negative electrode of the secondary side of the second transformer.

[0017] In some embodiments, the first switch is a low-power relay, and the second switch is a high-power relay.

[0018] In some embodiments, the first switch includes a switch tube and a control photocoupler, a first switch pin of the switch tube is connected to the reference potential point, a second switch pin of the switch tube is connected to the N line of the current loop communication circuit, a control pin of the switch tube is connected to a light-receiving end of the control photocoupler, and a light-emitting end of the control photocoupler is connected to a control pin of the indoor main control board.

[0019] In a second aspect, embodiments of the present application provide a wake-up method applied to an indoor main control board in the air conditioning system as described in the first aspect, and the wake-up method includes:

[0020] In response to an outdoor unit wake-up instruction, the first switch is controlled to be closed to form the charging loop to charge a capacitor assembly of the first switching power supply;

[0021] When a closing duration of the first switch reaches a preset closing duration, the first switch is controlled to be opened.

[0022] In some embodiments, the air conditioning system further includes an overcurrent protection circuit, the overcurrent protection circuit includes a thermistor, the capacitor assembly of the first switching power supply, the thermistor, and the auxiliary wake-up branch are connected in series in the charging loop, and the preset closing duration is determined according to the thermistor and a capacitance of the capacitor assembly of the first switching power supply.

[0023] In some embodiments, after the first switch is controlled to be opened, the wake-up method further includes:

[0024] 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 for;

[0025] If the acknowledgement response instruction is not received within a response duration threshold, the first switch is controlled to be closed again.

[0026] In some embodiments, the wake-up method further includes:

[0027] In the case that the acknowledgement response instruction is not received within the response duration threshold, a failure number is recorded;

[0028] When the failure number reaches a preset number, a fault reminder is sent.

[0029] In a third aspect, embodiments of the present application provide a wake-up method applied to an outdoor main control board in the air conditioning system as described in the first aspect, and the wake-up method includes:

[0030] After a preset delay time after power-on wake-up, the second switch is closed.

[0031] In some embodiments, the air conditioning system further comprises an overcurrent protection circuit, the overcurrent protection circuit comprises a thermistor, the capacitor assembly of the first switch power supply in the charging circuit, the thermistor and the auxiliary wake-up branch are connected in series, and a connection point of the thermistor and the auxiliary wake-up branch is connected to a voltage detection point of the outdoor main control panel; the wake-up method further comprises:

[0032] obtaining a detection voltage through the voltage detection point;

[0033] when the detection voltage is greater than a preset voltage threshold, controlling the second switch to be turned off.

[0034] In some embodiments, after the second switch is closed, the wake-up method further comprises:

[0035] turning on an outdoor data receiving optocoupler of the current loop communication circuit, and waiting for receiving an confirmation instruction sent by the indoor main control panel;

[0036] after receiving the confirmation instruction, sending a confirmation response instruction to the indoor main control panel through an outdoor data sending optocoupler of the current loop communication circuit.

[0037] 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 according to the second aspect and the third aspect.

[0038] In a fifth aspect, an embodiment of the present application provides a main control panel, comprising the controller according to the fourth aspect.

[0039] In a sixth aspect, an embodiment of the present application provides a computer readable storage medium, the computer readable storage medium stores computer executable instructions, and the computer executable instructions are used to make a computer execute the wake-up method according to the second aspect and the third aspect.

[0040] The air conditioning system, the wake-up method, the starting method, the controller and the main control board 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 at the indoor side, the current loop communication circuit N line and the reference potential point are connected at the indoor side when the first switch is closed, a direct current power supply is also provided at the indoor side, a direct current voltage is provided at the S line, the air conditioning system is provided with a second switch at the outdoor side, the S line-assisted wake-up branch-capacitor assembly of the first switch power supply-N 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, an energy charging circuit from the direct current power supply-S line-assisted wake-up branch-capacitor assembly of the first switch power supply-N line-reference potential point 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 working voltage for the main control chip of the outdoor main control board, and then the outdoor unit is woken up; in the above energy charging circuit, the direct current power supply provides direct current voltage through the S line, therefore, the first switch does not need to select large volume devices such as large power relays, 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.

[0041] 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

[0042] Figure 1 The circuit diagram of the air conditioning system provided by the embodiment of the present application;

[0043] Figure 2 The schematic diagram of the current flow direction in the wake-up process provided by the embodiment of the present application;

[0044] Figure 3 The schematic diagram of the current flow direction in the communication process provided by the embodiment of the present application;

[0045] Figure 4 The circuit diagram of the air conditioning system provided by another embodiment of the present application;

[0046] Figure 5 The flow chart of the wake-up method provided by one embodiment of the present application;

[0047] Figure 6 The flow chart of the wake-up method provided by another embodiment of the present application;

[0048] Figure 7 The flow chart of the wake-up method provided by another embodiment of the present application;

[0049] Figure 8is a flow chart of the starting method provided by an embodiment of the application;

[0050] Figure 9 is a flow chart of the starting method provided by another embodiment of the application;

[0051] Figure 10 is a flow chart of the starting method provided by another embodiment of the application;

[0052] Figure 11 is a schematic diagram of the controller provided by an embodiment of the application. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the application more clear, the 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 application and do not limit the 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 various sequences in the specification and drawings are only for clear description of a certain embodiment and do not mean a necessary sequence, unless otherwise stated that a certain sequence must be followed.

[0054] In the description of the application, one or more is meant to be one or more, more than two is meant to be more than two, greater than, less than, more than, etc. are understood to not include the number, above, below, etc. are understood to include the number. If it is described as first, second, 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.

[0055] 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 sequence or technical meaning. And the "connection", "coupling" in the application includes direct and indirect connection (coupling) unless otherwise specified.

[0056] 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 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 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.

[0057] With more and more additional functions of air conditioners, more elements are usually needed to be miniaturized in the limited space of the indoor main control board, but the power of the large power relay is large, and the volume and height of the large power relay are large, so it is difficult to miniaturize the relay.

[0058] Therefore, the air conditioning system, the wake-up method, the starting method, the controller and the main control board are provided. The air conditioning system based on the current loop communication circuit is provided with a first switch at the indoor side. The N line and the reference potential point of the current loop communication circuit are connected at the indoor side when the first switch is closed. A direct current power supply is also provided at the indoor side. The direct current voltage is provided by the S line. The air conditioning system is provided with a second switch at the outdoor side. The S line, the auxiliary wake-up branch, the capacitor assembly of the first switch power supply and the N 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 direct current power supply, the S line, the auxiliary wake-up branch, the capacitor assembly of the first switch power supply, the N line and the reference potential point. 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 the working voltage for the main control chip of the outdoor main control board, so as to wake up the outdoor unit. In the above energy charging circuit, the direct current voltage is provided by the direct current power supply through the S line, so the first switch does not need to select a large volume device such as a large power relay, thereby saving the space for arranging elements on the indoor main control board, and the cost of the indoor main control board can be lower.

[0059] The air conditioning system, the wake-up method, the starting method, the controller and the main control board will be described in detail below with reference to the accompanying drawings:

[0060] Referring to Figure 1 , the circuit diagram of the air conditioning system provided by the embodiments of the present application is shown. Figure 1

[0061] The current loop communication circuit is arranged between the indoor main control board and the outdoor main control board of the air conditioning system of the embodiments of the present application. The current loop communication circuit is connected to the AC input end of the first switch power supply 310 of the outdoor main control board through the L line and the N line at the outdoor side.

[0062] In some embodiments, the air conditioning system further comprises a first switch RY1 and a direct current power supply 200 arranged at the indoor side, and a second switch RY2 arranged at the outdoor side. The direct current power supply 200 is connected to the S line and the reference potential point of the current loop communication circuit. The first switch RY1 is connected to the N line and the reference potential point of the current loop communication circuit. The second switch RY2 is arranged between the L line of the current loop communication circuit and the AC input end of the first switch power supply 310.

[0063] ​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. Power supply and communication of the indoor main control board and / or the outdoor main control board are realized through 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 a relay, a photoelectric switch, a transistor or the like. The selection of the first switch RY1 and the second switch RY2 is not specifically limited in the embodiment.

[0064] In some embodiments, the first switch RY1 is a low-power relay, and the second switch RY2 is a high-power relay.

[0065] Specifically, in the prior art, a high-power relay is generally arranged on the indoor main control board, which occupies too much space of the indoor main control board and may limit the local and design of other functional modules, further limiting the function 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, that is, 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, and the second switch RY2 on the outdoor main control board can be a single-pole single-throw relay, thereby saving the space of the indoor main control board, reducing the space occupied by the first switch RY1 on the indoor main control board, further reducing the cost of the indoor main control board, and ensuring the normal operation of the air conditioning system.

[0066] In some embodiments, the auxiliary wake-up branch 400 is connected to the S line of the current loop communication circuit and the capacitor assembly E6 of the first switch power supply 310 on the outdoor side. The auxiliary wake-up branch 400 includes a unidirectional conduction element and a voltage dividing resistor. The positive terminal of the unidirectional conduction element is connected to the S line of the current loop communication circuit, the negative terminal 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 the negative electrode of the first diode D5. The unidirectional conduction element plays a role of preventing reverse current flow, that is, ensures that the signal can only be transmitted from the auxiliary wake-up circuit to the first switch power supply 310, prevents reverse current transmission, and the voltage dividing resistor is connected to the negative terminal of the unidirectional conduction element, thereby being able to step down the auxiliary wake-up branch 400, and further being able to provide stable voltage.

[0067] It should be noted that the output voltage of the auxiliary wake-up circuit may be higher than the voltage required by the main circuit. At this time, a voltage dividing resistor is connected to reduce the output voltage of the auxiliary wake-up circuit to meet the working voltage requirement of the main circuit. In addition, the unidirectional conduction element and the voltage dividing resistor can also provide protection for the auxiliary wake-up branch 400 in some cases, limit the current, and avoid damage to the auxiliary wake-up circuit due to excessive voltage or current.

[0068] It can be understood that the unidirectional conducting element in the embodiment can be a diode such as a photodiode or a light-emitting diode, and the embodiment is not specifically limited.

[0069] In some embodiments, when the air conditioning system is 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 500 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.

[0070] 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.

[0071] 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 opened, so that a charging circuit for charging the capacitor assembly E6 of the first switch power supply 310 is formed between the direct current power supply 200 and the reference potential point through the S line and the auxiliary wake-up branch 400, that is, a charging circuit from the direct current power supply 200-S line-auxiliary wake-up branch 400-capacitor assembly E6 of the first switch power supply 310-N line-reference potential point is formed, the charging of the capacitor assembly E6 of the first switch power supply 310 is realized, and the voltage across the capacitor assembly E6 of the first switch power supply 310 can be used to start the outdoor main control board, thereby realizing the wake-up of the outdoor unit.

[0072] In some embodiments, the first switch power supply 310 includes a first rectifier bridge circuit and a first transformer TR1, the first rectifier bridge circuit converts an alternating current signal into a direct current signal to provide a stable direct current output, the first rectifier bridge circuit is connected to the primary side of the first transformer TR1 to output a voltage to the first transformer TR1, and the capacitor assembly E6 of the first switch power supply 310 is connected in parallel with the secondary side of the first transformer TR1, so that different voltage outputs can be induced according to the voltage applied to the primary side, the parallel connection of the first transformer TR1 and the capacitor assembly E6 ensures the stability of the output voltage, and the connection point of the capacitor assembly E6 of the first switch power supply 310 and the secondary side of the first transformer TR1 is connected to the main control chip 500 of the outdoor main control board, the primary side and the secondary side of the first transformer TR1 are common, thereby providing a stable power supply for the main control chip 500, ensuring the normal operation of the main control chip 500, and ensuring the correct transmission and stability of the signal.

[0073] It can be understood that the first rectifier bridge circuit of the embodiment is connected with the primary side of the first transformer TR1, the voltage output by the first rectifier bridge circuit changes the voltage applied to the primary side of the first transformer TR1, so that the secondary side of the first transformer TR1 can induce different voltage outputs, finally, the noise in the power supply is filtered through the capacitor assembly E6 connected in parallel on the secondary side, ensuring the stability of the output voltage and providing additional power filtering function, so as to realize the stable power supply of the main control chip 500, ensure the normal operation of the main control chip 500, and protect it from interference in the power supply.

[0074] It should be noted that the first rectifier bridge circuit in the embodiment includes a first bridge arm and a second bridge arm, and a diode connected in each bridge arm, 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.

[0075] Specifically, the first bridge arm includes a third diode D9 and a 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 a fifth diode D10 and a 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.

[0076] Referring to Figure 2 , the Figure 2 schematic diagram of the current flow direction of the wake-up process provided by the embodiment of the application.

[0077] It can be understood that the solid arrow in the Figure 2 points to the direction of current flow.

[0078] As can be seen from Figure 2 , in the case that the first switch RY1 is closed and the second switch RY2 is open, the current flows out of the DC power supply 200, sequentially flows through the S line, the unidirectional conduction element and the voltage dividing resistor in the auxiliary wake-up branch 400, the capacitor assembly E6 of the first switch power supply 310, the first rectifier bridge of the first switch power supply 310, the N line, the reference potential point, that is, a loop of DC power supply 200-S line-unidirectional conduction element-voltage dividing resistor-capacitor assembly E6-first bridge arm of the first rectifier bridge-N line-reference potential point, thereby realizing the charging of the capacitor assembly E6 of the first switch power supply 310, when the capacitor assembly E6 is fully charged, the outdoor main control board is powered, and is woken up from the power-off mode.

[0079] In some embodiments, the first switch RY1 is arranged between the L line of the current loop communication circuit and the reference potential point, and the second switch RY2 is arranged between the N line and the input end of the first bridge arm in the first rectifier bridge circuit. When the first switch RY1 is closed and the second switch RY2 is opened, a charging loop for charging the capacitor assembly E6 of the first switching power supply 310 is formed between the DC power supply 200 and the reference potential point through the S line and the auxiliary wake-up branch 400. Specifically, the current flows out of the DC power supply 200, sequentially passes through the S line, the unidirectional conduction element and the voltage dividing resistor in the auxiliary wake-up branch 400, flows to the capacitor assembly E6 in the first switching power supply 310, then flows into the second bridge arm in the first rectifier bridge circuit, and finally flows to the reference potential point through the L line and the first switch RY1, forming a loop of the DC power supply 200-S line-unidirectional conduction element-voltage dividing resistor-capacitor assembly E6 in the first switching power supply 310-second bridge arm-L line-first switch RY1-reference potential point.

[0080] In some embodiments, the first switching power supply 310 further includes a first diode D5, the positive electrode of the secondary side of the first transformer TR1 is connected to the positive electrode of the first diode D5, and the negative electrode of the first diode D5 is connected to the negative electrode of the secondary side of the first transformer TR1 through the capacitor assembly E6 of the first switching power supply 310, thereby limiting the unidirectional conduction of the current and preventing the reverse current from flowing into the first transformer TR1, achieving the protection of the first transformer TR1 and avoiding the damage of the elements.

[0081] In some embodiments, the air conditioning system further includes an overcurrent protection circuit, thereby being capable of detecting and protecting the electronic devices from excessive current in the circuit. Specifically, the overcurrent protection circuit includes a thermistor PTC and a first voltage stabilizing diode DZ1. The thermistor PTC is connected in series between the auxiliary wake-up branch 400 and the negative electrode of the first diode D5. When the output current of the auxiliary wake-up branch 400 exceeds a certain limit value, the thermistor PTC will be heated and the resistance value will decrease, thereby reducing the voltage. The negative electrode of the first voltage stabilizing diode DZ1 is connected to the negative electrode of the first diode D5, and the positive electrode of the first voltage stabilizing diode DZ1 is connected to the negative electrode of the secondary side of the first transformer TR1. When the current exceeds a certain limit value, the voltage at the negative electrode of the first diode D5 will increase, and the first voltage stabilizing diode DZ1 will start to work to maintain a stable voltage output. Through the cooperation of the thermistor PTC and the first voltage stabilizing diode DZ1, the stability of the output voltage of the branch where the auxiliary wake-up branch 400 and the secondary side of the first transformer TR1 are located can be ensured, and the normal operation of the circuit and the protection of the devices from current surges or other power fluctuations can be ensured.

[0082] It can be understood that by using the thermal resistor PTC and the first voltage stabilizing diode DZ1 to build the overcurrent protection circuit, the outdoor unit can be protected from excessive current and overheating, while providing stable power output to ensure normal operation of the circuit and safety of the equipment.

[0083] It is worth noting that if the air conditioning system fails and the second switch RY2 cannot be turned off in time, a large current will flow through the thermal resistor PTC, and the thermal resistor PTC will heat up and immediately disconnect the auxiliary wake-up branch 400. At the same time, the first voltage stabilizing diode DZ1 will clamp the voltage to protect the rear-end device. The control chip of the outdoor main control board will detect that the current is too large and will turn off the second switch RY2 for protection.

[0084] In some embodiments, the first switching power supply 310 further comprises a voltage conversion circuit 600, the capacitor component E6 of the first switching power supply 310 is connected to the connection point of the secondary side of the first transformer TR1, and the voltage input end of the voltage conversion circuit 600, so as to adjust the voltage level of the output voltage of the secondary side of the first transformer TR1, realize voltage conversion of the secondary side of the first transformer TR1, and ensure the demand of the output voltage load. The voltage output end of the voltage conversion circuit 600 is connected to the main control chip 500 of the outdoor main control board, so as to realize stable power supply for the main control chip 500 of the outdoor main control board and meet the power supply demand of the main control chip 500 of the outdoor main control board.

[0085] In some embodiments, the current loop communication circuit is connected to the second switching power supply 320 of the indoor main control board through the L line and the N line on the indoor side. The second switching power supply 320 comprises a second rectifier bridge circuit and a second transformer TR2. The second rectifier bridge circuit is connected to the primary side of the second transformer TR2. The secondary side of the second transformer TR2 is connected to the DC power supply 200, i.e. the DC power supply 200 is the DC power supply 200.

[0086] It should be noted that the DC power supply 200 in the present embodiment is generated by a secondary winding in the second transformer TR2 of the indoor main control board, so that additional components and circuits are saved, the cost is reduced, and the system complexity is reduced, making it easier to design the indoor main control board to be small. Due to the small number of devices and simple circuit, a more compact layout can be adopted, thereby saving space and making the indoor main control board more compact and portable.

[0087] It is worth noting that the second rectifier bridge in the present embodiment comprises a third bridge arm and a fourth bridge arm, and a diode connected to each bridge arm is arranged on each bridge arm. The input end of the third bridge arm in the second rectifier bridge circuit is connected to the N line, and the first switch RY1 is arranged between the S line and the input end of the fourth bridge arm.

[0088] Specifically, the third bridge arm includes a seventh diode D7 and an eighth diode D11, the positive electrode of the seventh diode D7 is connected with the negative electrode of the eighth diode D11, the fourth bridge arm includes a ninth diode D8 and a twelfth diode D12, the positive electrode of the ninth diode D8 is connected with the negative electrode 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.

[0089] In some embodiments, the direct current power supply 200 includes a clamping capacitor E1 and a second diode D3, the positive electrode of the second diode D3 is connected with the positive electrode of the secondary side of the second transformer TR2, one end of the clamping capacitor E1 is connected with the negative electrode of the second diode D3 as the positive electrode of the direct current power supply 200, and the other end of the clamping capacitor E1 is connected with the negative electrode of the secondary side of the second transformer TR2, so that the voltage can be limited to not exceed a certain preset value, so that the clamping voltage is kept within a safe range, thereby protecting the circuit safe, improving the reliability and stability of the circuit.

[0090] It should be noted that in the embodiment, the positive electrode of the second diode D3 is connected with the positive electrode of the secondary side of the transformer, so that the second diode D3 is turned on at the forward voltage, and the voltage can be limited below the breakdown voltage of the second diode D3, when the input voltage exceeds the breakdown voltage of the second diode D3, the second diode D3 will become a conductive state, and the excess voltage will be shunted to the secondary side of the transformer through the clamping capacitor E1, thereby protecting the subsequent circuit from excessive voltage.

[0091] In some embodiments, the air conditioning system further includes an indoor data receiving optocoupler IC3 and an indoor data sending optocoupler IC1 arranged on the indoor side, and an outdoor data receiving optocoupler IC2 and an outdoor data sending optocoupler IC4 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, similarly, the outdoor main control board receives data through the outdoor data receiving optocoupler IC2, and sends data through the outdoor data sending optocoupler IC4.

[0092] Specifically, one end of the photosensitive component of the indoor data sending optocoupler IC1 is connected to a reference potential point, and the other end is connected to the negative electrode of the light-emitting diode in the indoor data receiving optocoupler IC3, the positive electrode of the light-emitting diode in the indoor data receiving optocoupler IC3 is connected to the N line, the positive electrode of the light-emitting diode in the outdoor data receiving optocoupler IC2 is connected to the S line, and the negative electrode is connected to the photosensitive component in the outdoor data sending optocoupler IC4. The indoor main control board and the outdoor main control board in the embodiment are respectively provided with optocoupler components, so that the connection and communication of the indoor main control board and the outdoor main control board can be determined, the optocoupler transmission is not affected by electromagnetic interference, the anti-interference ability of the communication system is improved, and the stability and safety of the air conditioning system are further improved.

[0093] In some embodiments, during the communication process of the indoor main control board and the outdoor main control board, after the outdoor main control board is woken up, the outdoor main control board will attract the outdoor data receiving optocoupler IC2 and the outdoor data sending optocoupler IC4, and wait to receive the command sent by the indoor main control board. At this time, the indoor main 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, the outdoor main control board receives the instructions sent by the indoor main control board through the outdoor data receiving optocoupler IC2, and returns the corresponding response instructions through the outdoor data sending optocoupler IC4, and the indoor main control board receives the response instructions sent by the outdoor main control board through the indoor receiving optocoupler, so that the wake-up situation or working situation of the outdoor main control board can be determined through the change of the optocoupler, the working state of the outdoor main control board is detected, and the current flow direction in the communication process is as follows.

[0094] Referring to Figure 3 , the Figure 3 is a schematic diagram of the current flow direction of the communication process provided by the embodiment of the present application.

[0095] It can be understood that, Figure 3 the solid arrow in the figure points to the current flow direction.

[0096] As Figure 3 can be seen, after the outdoor unit is woken up, the outdoor main control board will attract the outdoor data sending optocoupler IC4, and wait to receive the command of the indoor main control board. At this time, the current flow process in the communication process is as follows: the current flows out from the direct current power supply 200, flows into the outdoor data receiving optocoupler IC2 through the S line, flows into the outdoor data sending optocoupler IC4, flows into the indoor data receiving optocoupler IC3 through the N line, and finally flows into the indoor data sending optocoupler IC1, and then flows into the reference potential point, that is, a loop of direct current power supply 200-S line-outdoor data receiving optocoupler IC2-outdoor data sending optocoupler IC4-N line-indoor data receiving optocoupler IC3-indoor data sending optocoupler IC1-reference potential point is formed, and one communication process is completed.

[0097] It is worth noting that the current does not flow into the first rectifier bridge circuit through the auxiliary wake-up branch 400 in the middle, because the first rectifier bridge circuit does not form a loop with the DC power supply 200, and both are in an open state, so this method can save a relay, or avoid using a double-pole or single-pole double-throw relay, further saving the space of the indoor main control board, making the indoor main control board easier to realize miniaturization design.

[0098] Referring to Figure 4 , the circuit diagram of the air conditioning system provided by another embodiment of the present application is shown. Figure 4 , the circuit diagram of the air conditioning system provided by another embodiment of the present application is shown.

[0099] In some embodiments, the first switch RY1 can be a relay, or a combination of a switch tube and a control optocoupler. In the case where the first switch RY1 is a combination of a switch tube and a control optocoupler, the first switch RY1 pin of the switch tube is connected to the reference potential point, the second switch RY2 pin of the switch tube is connected to the N line of the current loop communication circuit, thereby forming a communication loop, the control pin of the switch tube is connected to the light-sensitive end of the control optocoupler, and the light-emitting end of the control optocoupler is connected to the control pin of the indoor main control board, thereby controlling the switch tube to be turned on or turned off through the state of the light-emitting diode in the control optocoupler.

[0100] It can be understood that, taking a PNP switch tube as an example, the base of the PNP switch tube is connected to the light-sensitive end of the control optocoupler, the emitter is connected to the reference potential point, and the collector is connected to the N line of the current loop communication circuit. When the light-emitting diode in the control optocoupler emits light, the PNP switch tube is low-level on; when the light-emitting diode does not emit light, the PNP switch tube is high-level off, thereby realizing the turn-on or turn-off of the loop.

[0101] It can be understood by those skilled in the art that, Figures 1-4 The schematic diagram shown in the foregoing does not constitute 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. The wake-up method in the embodiment will be specifically described below.

[0102] Referring to Figure 5 , the flow chart of the wake-up method provided by one embodiment of the present application is shown. Figure 5 , the flow chart of the wake-up method provided by one embodiment of the present application is shown. Figure 1 , the flow chart of the wake-up method provided by one embodiment of the present application is shown.

[0103] 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 loop to charge the capacitor assembly E6 of the first switching power supply 310.

[0104] In some embodiments, when the air conditioning system is 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, a loop 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 clamping circuit, that is, a charging loop is formed from the direct current power supply 200-S line-assisted wake-up branch 400-first switch power supply 310-capacitor component E6-N line-reference potential point, the direct current power supply 200 can be used to provide a direct current voltage through the S line to charge the capacitor component E6 of the first switch power supply 310, and then the voltage across the capacitor component E6 of the first switch power supply 310 is used to provide a working voltage for the main control chip 500 of the outdoor main control board, and then the outdoor unit is woken up.

[0105] 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.

[0106] In step S102, it is determined whether the closing duration of the first switch RY1 reaches a preset closing duration, and the first switch RY1 is controlled to be opened.

[0107] In some embodiments, during the charging process of the capacitor component E6 of the first switch power supply 310, if the first switch RY1 and the second switch RY2 are closed at the same time, the N line will form a loop with the L line through the direct current power supply 200, the auxiliary wake-up branch 400, and the second switch RY2, thereby damaging the components. Therefore, after controlling the first switch RY1 to be closed, the closing duration of the first switch RY1 needs to be calculated, and then it is determined whether the closing duration of the first switch RY1 reaches a 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, thereby avoiding the damage of components caused by the simultaneous closing of the two switches.

[0108] In some embodiments, the air conditioning system further comprises an overcurrent protection circuit, the overcurrent protection circuit comprises a thermistor PTC, the capacitor component E6 of the first switch power supply 310, the thermistor PTC, and the auxiliary wake-up branch 400 in the charging loop are connected in series, and the preset closing duration is determined according to the capacitance of the thermistor PTC and the capacitor component E6 of the first switch power supply 310, thereby adjusting the opening time according to the actual demand, so that the circuit can be opened in time when an abnormality occurs, to protect the electrical appliances and the circuit.

[0109] It can be understood that the preset closing time length determined according to the thermal resistance PTC and the capacitance of the capacitor assembly E6 of the first switching power supply 310 in the embodiment can make the circuit more flexible and reliable, ensure that the circuit can be disconnected in time in abnormal conditions, and protect the safe operation of the equipment and system. Specifically, the preset closing time length T_charge can be obtained according to the following formula:

[0110] T_charge = 5 * R * C;

[0111] Wherein, R is the thermal resistance PTC, and C is the capacitance of the capacitor assembly E6 of the first switching power supply 310.

[0112] Referring to Figure 6 , it is a flowchart of the wake-up method provided by another embodiment of the application. It includes but is not limited to steps S201 to S202. Figure 6

[0113] It should be noted that steps S201 to S202 occur after the first switch RY1 is controlled to be disconnected.

[0114] In step S201, a confirmation instruction is sent to the outdoor main control board through the current loop communication circuit, and a confirmation response instruction sent by the outdoor main control board is waited.

[0115] In step S202, if the confirmation response instruction is not received within the response time threshold, the first switch RY1 is controlled to be closed again.

[0116] In steps S201 to S202 of some embodiments, due to the many additional functions of the air conditioning system, the outdoor unit may fail to wake up or the air conditioner may have abnormal functions. After the first switch RY1 is controlled to be disconnected, the embodiment will send a confirmation instruction 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 live, and wait for the confirmation response instruction sent by the outdoor main control board. If the confirmation 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 and ensure that the air conditioning system can operate normally, thereby improving the stability and reliability of the air conditioning system.

[0117] In some embodiments, if the confirmation response instruction is received within the response time threshold, the wake-up process is ended.

[0118] It can be understood that the response time threshold in the embodiment can be set by the user according to the needs, such as 500 milliseconds, 300 milliseconds, 550 milliseconds, etc., and the embodiment does not make specific limitations.

[0119] Referring to Figure 7 , it is a flowchart of the wake-up method provided by another embodiment of the application. It includes but is not limited to steps S201 to S202. Figure 7 ​is a flowchart of the wake-up method provided by another embodiment of the present application. It includes but is not limited to steps S301 to S302.

[0120] Step S301, record the failure number in the case of not receiving the confirmation response instruction within the response duration threshold.

[0121] Step S302, issue a fault reminder when the failure number reaches the preset number.

[0122] In steps S301 to S302 of some embodiments, after sending the confirmation instruction to the outdoor main control panel through the current loop communication circuit, if the confirmation response instruction is not received within the response duration threshold, the failure number needs to be recorded, and the confirmation instruction continues to be sent to the outdoor main control panel through the current loop communication circuit, and the failure number is updated in the case of not receiving the confirmation response instruction. The failure number is compared with the preset number, and when the failure number reaches the preset number, a fault reminder needs to be issued, so that the staff can discover and handle the fault or abnormality of the outdoor main 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.

[0123] It should be noted that when the failure number does not reach the preset number, the confirmation instruction needs to be continued to be sent to the outdoor main 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., and the present embodiment does not make specific limitation.

[0124] Referring to Figure 8 , the flowchart of the start-up method provided by an embodiment of the present application is shown. Figure 8 The flowchart of the start-up method provided by an embodiment of the present application is shown. It is applied to but not limited to the outdoor main control panel of the air conditioning system in Figure 1 , including but not limited to step S401.

[0125] Step S401, close the second switch RY2 after a preset delay duration after power-on wake-up.

[0126] In some embodiments, after the outdoor main control panel is powered on and wakes up, the present embodiment does not immediately close the second switch RY2, but closes the second switch RY2 after a preset delay duration, thereby ensuring that other components and devices in the circuit have enough time to stabilize and start up, avoiding excessive current impact, and at the same time, leaving a certain time to disconnect the first switch RY1, avoiding the case that the loop formed by the simultaneous closing of the two switches damages the components.

[0127] It is worth noting that after the outdoor main control panel is powered on and wakes up, the second switch RY2 is closed after a preset delay duration, and a margin is left for the first switch RY1 to cut off. After the second switch RY2 is closed, the first switch power supply 310 supplies power through the loop formed by the L line and the N line.

[0128] It should be noted that the delay duration in the embodiment can be set by the user as required, for example, 500 milliseconds, 400 milliseconds, 550 milliseconds, etc., and the embodiment is not specifically limited.

[0129] Referring to Figure 9 , it is shown that Figure 9 is a flowchart of the starting method provided by another embodiment of the application. It includes but is not limited to steps S501 to S502.

[0130] In some embodiments, the air conditioning system further comprises an overcurrent protection circuit, the overcurrent protection circuit comprises a thermistor PTC, and the capacitor assembly E6 of the first switching power supply 310 in the charging circuit, the thermistor PTC and the auxiliary wake-up branch 400 are connected in series, and the connection point of the thermistor PTC and the auxiliary wake-up branch 400 is connected to the voltage detection point of the outdoor main control board.

[0131] In step S501, the detection voltage is obtained through the voltage detection point.

[0132] In step S502, when the detection voltage is greater than the preset voltage threshold, the second switch RY2 is controlled to be turned off.

[0133] In steps S501 to S502 of some embodiments, during the operation of the air conditioning system, a fault may occur, and the first switch RY1 cannot be turned off in time. Therefore, in this embodiment, the connection point of the thermistor PTC and the auxiliary wake-up branch 400 is connected to the voltage detection point of the outdoor main control board, and the detection voltage is obtained through the voltage detection point, and the size of the detection voltage and the preset voltage threshold is judged. When the detection voltage is greater than the preset voltage threshold, it means that a large current is flowing through the overcurrent protection circuit at this time, and the second switch RY2 needs to be controlled to be turned off to realize overcurrent detection of the circuit, thereby protecting the circuit.

[0134] It can be understood that when a large current flows through the overcurrent protection circuit, the thermistor PTC will heat up and disconnect the auxiliary wake-up branch 400, and the first voltage stabilizing diode DZ1 in the overcurrent protection circuit will also be clamped to protect the voltage, avoiding damage to the rear-end device.

[0135] It should be noted that the preset voltage threshold in the embodiment can be set by the user or the model of the component as required, and the embodiment is not specifically limited.

[0136] Referring to Figure 10 , it is shown that Figure 10 is a flowchart of the starting method provided by another embodiment of the application. It includes but is not limited to steps S601 to S602.

[0137] It should be noted that steps S601 to S602 occur after the second switch RY2 is closed.

[0138] In step S601, the outdoor data receiving optocoupler IC2 of the current loop communication circuit is turned on, and the confirmation instruction sent by the indoor main control board is waited to be received.

[0139] In step S602, after receiving the confirmation instruction, the outdoor data sending optocoupler IC4 of the current loop communication circuit sends a confirmation response instruction to the indoor main control board.

[0140] In steps S601 to S602 of some embodiments, after the second switch RY2 is closed, the outdoor main control board will attract the outdoor data receiving optocoupler IC2 and the outdoor sending optocoupler, that is, turn on the outdoor data receiving optocoupler IC2 and the outdoor data sending optocoupler IC4 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 IC4 of the current loop communication circuit sends a confirmation response instruction to the indoor main control board in the embodiment, so as 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.

[0141] 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 explained.

[0142] Example one:

[0143] Example one is a specific description of the wake-up method of the air conditioning system. The following is based on the structure of the air conditioning system in Figure 1 to describe the wake-up method in detail.

[0144] In some embodiments, a current loop communication circuit is arranged 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 310 of the outdoor main control board through the L line and the N line on the outdoor side. The air conditioning system further comprises a DC power supply 200 connected to the S line of the current loop communication circuit and the reference potential point on the indoor side, a first switch RY1 connected to the N line of the current loop communication circuit and the reference potential point on the indoor side, and a second switch RY2 arranged between the L line of the current loop communication circuit and the AC input end of the first switch power supply 310 on the outdoor side. The first switch RY1 and the second switch RY2 are both relays in this example.

[0145] It should be noted that the indoor data receiving optical coupling IC3 and the indoor data sending optical coupling IC1 form a current loop communication circuit. The communication current loop is powered by a 24V voltage generated by the DC power supply 200, which is loaded on the S line. Since the DC power supply 200 is generated by a secondary winding in the second transformer TR2 on the indoor main control board, it has low cost and fewer devices for generating 24V, which is more conducive to the miniaturization of the indoor electrical control.

[0146] It can be understood that the indoor main control board and the outdoor main control board are connected by three wires, L line, N line and S line, which are respectively connected to L1, N1 and S1 terminal in the indoor main control board, and L2, N2 and S2 terminal in the outdoor main control board. In addition, the relay (first switch RY1) used in the indoor main control board is a single-pole single-throw low-power small-size relay, which can reduce the space of the indoor main control board and reduce the cost. The relay (second switch RY2) used in the outdoor main control board is a single-pole single-throw relay, which can reduce the cost.

[0147] It is worth noting that the auxiliary wake-up branch 400 in the embodiment is connected to the secondary side of the first transformer TR1 in the first switching power supply 310, which can provide power during the process of waking up the outdoor unit.

[0148] In the embodiment, the DC power supply 200 can provide DC voltage through the S line, so the first switch RY1 does not need to select a large power relay and other large volume devices, which can save the space of the indoor main control board for layout components, and the cost of the indoor main control board can be lower.

[0149] In combination with the above introduction to the structure of the air conditioning system, the wake-up process of the air conditioning system will be described in detail.

[0150] When the air conditioning system is powered on, the second switch RY2 of the outdoor main control board is open, L2 and N2 do not form a loop, and the main control chip 500 of the outdoor main control board is in a power-off state. Only the indoor main control is powered on, and the indoor main control board enters a standby state without user operation. Therefore, low power standby of the whole machine can be realized in this state.

[0151] In the process of waking up, first, the capacitor component E6 in the first switching power supply 310 is charged. Specifically, when the user needs refrigeration or heating, the indoor main control panel needs to wake up the outdoor main control panel in the power-off state. The indoor main control panel closes the first switch RY1 to connect the N1 line to the "zero potential" of the DC power supply 200. At this time, since the power supply is isolated, N1 does not form a loop with the L1 line through the "zero potential", which is a safe connection. Then, the current flows from the "+24V" of the DC power supply 200 from S1 to S2, passes through the auxiliary wake-up branch 400 and the overcurrent protection circuit, and flows into the capacitor component E6 in the first switching power supply 310, thereby realizing secondary filter of the outdoor unit. Then, it enters the first rectifier bridge circuit, passes through the first bridge arm in the first rectifier bridge circuit, and then flows from N2 to N1 through the closed first switch RY1 channel, and flows into the "zero potential" of the DC power supply 200 to form a charging loop, completing the charging process of the capacitor component E6 in the first switching power supply 310. When the capacitor component E6 in the first switching power supply 310 is fully charged, the main control chip 500 of the outdoor main control panel is powered and wakes up from the power-off mode.

[0152] It should be noted that the capacitor component E6 in the first switching power supply 310 in the embodiment is a low-voltage point capacitor, and the reference potential point in the embodiment is zero potential.

[0153] Then, the disconnection time of the first switch RY1 is determined. Since during the attraction period of the first switch RY1, if the second switch RY2 is also attracted, N1 will form a loop with L1 through the DC power supply 200, the auxiliary wake-up branch 400, and the channel after the second switch RY2 is attracted, thereby damaging the components. Therefore, the first switch RY1 needs to be disconnected in time after the main control chip 500 wakes up, and at the same time, the main control chip 500 also needs to be attracted to the second switch RY2 after a delay of about 500ms.

[0154] It should be noted that the time from attraction to disconnection of the first switch RY1 in the embodiment can be obtained according to the formula T_charge=5*R*C, where R is the resistance of the overcurrent protection circuit, and C is the capacitance of the capacitor component E6 in the first switching power supply 310.

[0155] Finally, after the outdoor master control is awakened, the second switch RY2 is attracted after a delay T_delay (500 ms), leaving a margin for the first switch RY1 to cut off. After the second switch RY2 is turned on, the outdoor switch power supply supplies power through the loop formed by L2 and N2. The outdoor master control MCU turns on the outdoor data sending optocoupler IC4, and in response to the confirmation command issued by the master control MCU, the indoor master control sends a command to the outdoor master control board through the current loop to confirm whether the outdoor master control board is live and whether the function is normal. If an ACK confirmation is received from the outdoor master control board within 500 ms after the command is issued, the entire wake-up function is ended.

[0156] It should be noted that if the indoor master control board does not receive an ACK confirmation from the outdoor master control board within 500 ms, the above-mentioned step is repeated three times, and if no ACK is received for three times, an alarm is raised.

[0157] In some embodiments, if the air conditioning system fails and the first switch RY1 cannot cut off in time, a large current flows through the overcurrent protection circuit, the overcurrent protection circuit generates heat and immediately disconnects the auxiliary wake-up branch 400, and the first voltage stabilizing diode DZ1 protects the rear-end devices. The outdoor master control MCU detects that the current is too large and cuts off the second switch RY2 relay to protect the circuit, ensuring the safe operation of the circuit.

[0158] In some embodiments, when the user needs to shut down, the indoor master control board sends a command to the outdoor master control board, and the outdoor master control board cuts off the second switch RY2 to achieve power-off.

[0159] Example Two:

[0160] Example Two is a specific description of the communication process of the indoor master control board and the outdoor master control board. Based on the structure of the air conditioning system in Figure 1 , the communication process is described in detail.

[0161] In some embodiments, after the outdoor master control board is awakened, it will attract the outdoor data sending optocoupler IC4 and wait to receive the command from the indoor master control board. At this time, the current flow of the communication process is shown in Figure 3 , the current flows out from 24V in the DC power supply 200, passes through S1 to S2, flows into the outdoor data receiving optocoupler IC2, then flows into the outdoor data sending optocoupler IC4, and then flows from N2 into N1, and then flows from N1 into the indoor data receiving optocoupler IC3, and then flows into the indoor data sending optocoupler IC1, forming a loop of DC power supply 200-S line-outdoor data receiving optocoupler IC2-outdoor data sending optocoupler IC4-N line-indoor data receiving optocoupler IC3-indoor data sending optocoupler IC1, completing a communication process.

[0162] It is worth noting that the current does not flow into the first rectifier bridge circuit through the auxiliary wake-up branch 400 in the middle, because the first rectifier bridge circuit does not form a loop with the direct current power supply 200, and both are in a disconnected state, so this method can save a relay, or avoid using a double-pole or single-pole double-throw relay.

[0163] As Figure 11 shown, Figure 11 is a schematic diagram of a controller 1000 provided by an embodiment of the present application.

[0164] An embodiment of the present application further provides a controller 1000, comprising at least one processor and a memory connected with the at least one processor in communication; 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 starting method of the above-described embodiments.

[0165] The controller 1000 of the embodiment of the present application comprises one or more processors 1001 and a memory 1002, Figure 11 for example, one processor 1001 and one memory 1002.

[0166] The processor 1001 and the memory 1002 can be connected through a bus or other means, Figure 11 for example, through a bus.

[0167] 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 relative 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.

[0168] In some embodiments, the present embodiment further provides a master control board, comprising the controller as described above Figure 11 , and the controller 1000 is used to execute the aforementioned wake-up method or starting method.

[0169] It is worth noting that since the master control board of the embodiment of the present application comprises the controller of the above-described embodiments, 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 starting method of any one of the above-described embodiments, and the present embodiment will not be described here.

[0170] As will be appreciated by one of ordinary skill in the art, all or some of the steps, systems, and techniques disclosed herein can be embodied in software, firmware, hardware, and / or suitable combination thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a micro-processing unit, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on computer readable media, which can comprise computer storage media (or non-transitory media), and communication media (or transitory media). As is well known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile, 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 tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. Further, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as a carrier wave or other transport mechanism, and includes any information delivery media.

[0171] The above description is that of the preferred embodiments of the present application. Various equivalents substitutions and modifications can be conceived by those skilled in the art without departing from the spirit of the present application, and these equivalents substitutions and modifications are included in the scope of 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 air conditioning system further comprises: A direct current power supply is connected to the S line and the reference potential point of the current loop communication circuit on the indoor side. A first switch is connected to the N line and the reference potential point of the current loop communication circuit on the indoor side. A 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.

2. The air conditioning system of claim 1, wherein, An 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.

3. The air conditioning system of claim 2, wherein, When the first switch is closed and the second switch is opened, a charging circuit is formed between the direct current power supply and the reference potential point through the S line and the auxiliary wake-up branch to charge the capacitor assembly of the first switching power supply, so that the voltage across the capacitor assembly of the first switching power supply is used to start the outdoor main control board.

4. The air conditioning system of claim 3, wherein, The first switching power supply comprises a first rectifier bridge circuit and a first transformer, the first rectifier bridge circuit is connected to the primary side of the first transformer, the capacitor assembly of the first switching power supply is connected in parallel with the secondary side of the first transformer, the connection point of the capacitor assembly of the first switching power supply and the secondary side of the first transformer is connected to the main control chip of the outdoor main control board, and the primary side and the secondary side of the first transformer are grounded.

5. The air conditioning system of claim 4, wherein, The first switching power supply further comprises a first diode, the positive electrode of the secondary side of the first transformer is connected to the positive electrode of the first diode, and the negative electrode of the first diode is connected to the negative electrode of the secondary side of the first transformer through the capacitor assembly of the first switching power supply.

6. The air conditioning system of claim 2, wherein, The auxiliary wake-up branch comprises a unidirectional conduction element and a voltage dividing resistor, the forward end of the unidirectional conduction element is connected to the S line of the current loop communication circuit, the negative 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 the negative electrode of the first diode.

7. The air conditioning system of claim 1, wherein The air conditioning system further comprises an overcurrent protection circuit, the overcurrent protection circuit comprises a thermistor and a first voltage stabilizing diode, the thermistor is connected in series between the auxiliary wake-up branch and the negative electrode of the first diode, the negative electrode of the first voltage stabilizing diode is connected to the negative electrode of the first diode, and the positive electrode of the first voltage stabilizing diode is connected to the negative electrode of the secondary side of the first transformer. The first switching power supply further comprises a voltage conversion circuit, the connection point of the capacitor assembly of the first switching power supply and the secondary side of the first transformer is connected to the voltage input end of the voltage conversion circuit, and the voltage output end of the voltage conversion circuit is connected to the main control chip of the outdoor main control board. The current loop communication circuit is connected to the second switching power supply of the indoor main control board through L line and N line on the indoor side, the second switching power supply comprises a second rectifier bridge circuit and a second transformer, the second rectifier bridge circuit is connected to the primary side of the second transformer, and the secondary side of the second transformer is connected to the direct current power supply.

8. The air conditioning system of claim 7, wherein, The direct current power supply comprises a clamping capacitor and a second diode, a positive electrode of the second diode is connected to a positive electrode of the secondary side of the second transformer, one end of the clamping capacitor is connected to a negative electrode of the second diode as a positive electrode of the direct current power supply, and the other end of the clamping capacitor is connected to a negative electrode of the secondary side of the second transformer.

9. The air conditioning system according to any one of claims 1 to 8, wherein The first switch is a low-power relay, and the second switch is a high-power relay.

10. The air conditioning system according to any one of claims 1 to 8, wherein The first switch comprises a switch tube and a control photocoupler, a first switch pin of the switch tube is connected to the reference potential point, a second switch pin of the switch tube is connected to an N line of the current loop communication circuit, a control pin of the switch tube is connected to a photosensitive end of the control photocoupler, and a light-emitting end of the control photocoupler is connected to a control pin of the indoor master control board.

11. A method of waking up, characterized by, The indoor master control board is applied to the air conditioning system as claimed in any one of claims 1 to 10, and the wake-up method comprises: in response to an outdoor unit wake-up instruction, controlling the first switch to be closed to form the charging loop to charge a capacitor assembly of the first switch power supply; determining that a closing duration of the first switch reaches a preset closing duration, and controlling the first switch to be opened.

12. The wake-up method of claim 11, wherein, The air conditioning system further comprises an overcurrent protection circuit, the overcurrent protection circuit comprises a thermistor, the capacitor assembly of the first switch power supply in the charging loop, the thermistor and the auxiliary wake-up branch are connected in series, and the preset closing duration is determined according to the thermistor and a capacitance of the capacitor assembly of the first switch power supply.

13. The wake-up method of claim 11, wherein, After the first switch is controlled to be opened, the wake-up method further comprises: sending an acknowledgement instruction to the outdoor master control board through the current loop communication circuit and waiting for an acknowledgement response instruction sent by the outdoor master control board; if the acknowledgement response instruction is not received within an acknowledgement duration threshold, the first switch is controlled to be closed again.

14. The wake-up method of claim 13, wherein, The wake-up method further comprises: in the case that the acknowledgement response instruction is not received within the acknowledgement duration threshold, recording a failure number; when the failure number reaches a preset number, issuing a fault reminder.

15. A method of starting, characterized by The outdoor master control board is applied to the air conditioning system as claimed in any one of claims 1 to 10, and the start-up method comprises: after a preset delay duration after power-on wake-up, the second switch is closed.

16. The start-up method of claim 15, wherein The air conditioning system further comprises an overcurrent protection circuit, the overcurrent protection circuit comprises a thermistor, the capacitor assembly of the first switch power supply in the charging loop, the thermistor and the auxiliary wake-up branch are connected in series, and a connection point of the thermistor and the auxiliary wake-up branch is connected to a voltage detection point of the outdoor master control board; The start-up method further comprises: obtaining a detection voltage through the voltage detection point; when the detection voltage is greater than a preset voltage threshold, the second switch is controlled to be opened.

17. The method of starting according to claim 15, wherein, After the second switch is closed, the start-up method further comprises: turning on an outdoor data receiving photocoupler of the current loop communication circuit and waiting for receiving an acknowledgement instruction sent by the indoor master control board; after the acknowledgement instruction is received, an acknowledgement response instruction is sent to the indoor master control board through an outdoor data sending photocoupler of the current loop communication circuit.

18. A controller characterized by comprising: A computer program product comprising at least one processor and memory connected in communication with the at least one processor; the memory storing instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the wake-up method of any one of claims 10 to 14 or to perform the start-up method of any one of claims 15 to 17.

19. A master control board, characterized by A controller as claimed in claim 18.

Images