Air conditioning system

Abstract

The utility model discloses an air conditioning system which 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 conditioning system. Background Art

[0002] The communication method 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 achieve low power standby, the indoor main control board generally reserves a high-power relay to cut off the power supply of the outdoor unit, so as to reduce the power consumption of the whole machine when standby is required. If cooling or heating is required in the standby state, the indoor unit main control board controls the high-power relay to pull in, supply power to the outdoor unit and wake up the outdoor main control board.

[0003] As air conditioners have more and more additional functions, the indoor main control board usually needs to miniaturize the components in order to arrange more components in a limited space. However, high-power relays withstand large power and have large size and height, making it difficult to miniaturize the relays. Utility Model Content

[0004] This embodiment provides an air conditioning system, which can save space for layout of components on an indoor main control board.

[0005] In a first aspect, an embodiment of the present application provides an air conditioning system, wherein a current loop communication circuit is provided 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 AC input terminal 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 DC power supply connected to the S line of the current loop communication circuit and a reference potential point on the indoor side;

[0007] A first switch, connecting the N line of the current loop communication circuit and the reference potential point on the indoor side;

[0008] A second switch is arranged on the outdoor side between the L line of the current loop communication circuit and the AC input terminal of the first switching power supply;

[0009] An auxiliary wake-up branch is connected to the S line of the current loop communication circuit and the capacitor component of the first switching power supply on the outdoor side; when the first switch is closed and the second switch is opened, a charging circuit for charging the capacitor component of the first switching power supply is formed between the DC 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 using the voltage across the capacitor component 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 the primary side of the first transformer, the capacitor component of the first switching power supply is connected in parallel with the secondary side of the first transformer, the connection point between the capacitor component 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 in common.

[0011] In some embodiments, the first switching power supply further includes 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 a capacitor component of the first switching power supply.

[0012] In some embodiments, the auxiliary wake-up branch includes a unidirectional conductive element and a voltage divider resistor, the positive end of the unidirectional conductive element is connected to the S line of the current loop communication circuit, the negative end of the unidirectional conductive element is connected to one end of the voltage divider resistor, and the other end of the voltage divider resistor is connected to the cathode of the first diode.

[0013] In some embodiments, the air-conditioning system also includes an overcurrent protection circuit, which includes a thermistor and a first zener diode, the thermistor is connected in series between the auxiliary wake-up branch and the cathode of the first diode, the cathode of the first zener diode is connected to the cathode of the first diode, and the anode of the first zener diode is connected to the cathode of the secondary side of the first transformer.

[0014] In some embodiments, the first switching power supply also includes a voltage conversion circuit, the connection point between the capacitor component 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.

[0015] In some embodiments, the current loop communication circuit is connected to the second switching power supply of the indoor main control board through the L line and the N line on the indoor side, and the second switching power supply includes 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 DC power supply.

[0016] In some embodiments, the DC power supply includes a clamping capacitor and a second diode, the anode of the second diode is connected to the positive electrode of the secondary side of the second transformer, one end of the clamping capacitor is connected to the negative electrode of the second diode as the positive electrode of the DC power supply, and the other end of the clamping capacitor is connected to the 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 optocoupler, the first switch pin of the switch tube is connected to the reference potential point, the second switch pin of the switch tube is connected to the N line of the current loop communication circuit, the control pin of the switch tube is connected to the photosensitive 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.

[0019] The air-conditioning system of this embodiment has 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, and 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, and the N line of the current loop communication circuit - the capacitor component of the first switch power supply - the auxiliary wake-up branch - the S line are connected on the outdoor side when the second switch is opened. Therefore, when it is necessary to wake up the outdoor main control board, the first switch is controlled to be closed and the second switch is controlled to be opened, so that a charging circuit from the N line of the current loop communication circuit - the capacitor component of the first switch power supply - the auxiliary wake-up branch - the S line - the first switch - the L line can be formed to charge the capacitor component of the first switch power supply, and then the voltage across the capacitor component of the first switch power supply is used to provide a working voltage for the main control chip of the outdoor main control board, thereby waking up the outdoor unit; in the above-mentioned charging circuit, since the auxiliary wake-up branch is provided in series with the first switch for voltage division, the power that the first switch needs to bear is reduced, and the first switch does not need to use large-volume devices such as high-power relays, so that the space for layout components on the indoor main control board can be saved, and the cost of the indoor main control board can also be lower.

[0020] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A circuit diagram of an air conditioning system provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the current flow direction during the wake-up process provided by an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the current flow direction during the communication process provided by an embodiment of the present application;

[0024] Figure 4 A circuit diagram of an air conditioning system provided in another embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods.

[0026] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0028] The communication method 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 achieve low power standby, the indoor main control board generally reserves a high-power relay to cut off the power supply of the outdoor unit, so as to reduce the power consumption of the whole machine when standby is required. If cooling or heating is required in the standby state, the indoor unit main control board controls the high-power relay to pull in, supply power to the outdoor unit and wake up the outdoor main control board.

[0029] As air conditioners have more and more additional functions, the indoor main control board usually needs to miniaturize the components in order to arrange more components in a limited space. However, high-power relays withstand large power and have large size and height, making it difficult to miniaturize the relays.

[0030] Based on this, the present embodiment provides an air-conditioning system, in which a first switch is arranged on the indoor side of the air-conditioning system based on the current loop communication circuit, and when the first switch is closed, the N line of the current loop communication circuit and the reference potential point are connected on the indoor side, and a DC power supply is arranged on the indoor side to provide a DC voltage on the S line, and a second switch is arranged on the outdoor side of the air-conditioning system, and when the second switch is opened, the S line-auxiliary wake-up branch-capacitor component of the first switch power supply-N line are connected on the outdoor side, so when it is necessary to wake up the outdoor main control board, the first switch is controlled to be closed and the second switch is opened, so that a charging circuit from the DC power supply-S line-auxiliary wake-up branch-capacitor component of the first switch power supply-N line-reference potential point can be formed, and the capacitor component of the first switch power supply is charged, and then the voltage across the capacitor component of the first switch power supply is used to provide a working voltage for the main control chip of the outdoor main control board, thereby waking up the outdoor unit; in the above-mentioned charging circuit, since a DC power supply is used to provide a DC voltage through the S line, the first switch does not need to use large-volume devices such as high-power relays, so that the space for layout components on the indoor main control board can be saved, and the cost of the indoor main control board can also be lower.

[0031] The air conditioning system is described in detail below with reference to the accompanying drawings:

[0032] Reference Figure 1 As shown, Figure 1 A circuit diagram of an air conditioning system provided in an embodiment of the present application.

[0033] A current loop communication circuit is provided between the indoor main control board and the outdoor main control board of the air-conditioning system in the embodiment of the present application. The current loop communication circuit is connected to the AC input terminal of the first switching power supply 310 of the outdoor main control board through the L line and the N line on the outdoor side.

[0034] In some embodiments, the air conditioning system also includes a first switch RY1 and a DC power supply 200 arranged on the indoor side, and a second switch RY2 arranged on the outdoor side, wherein the DC 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, and the second switch RY2 is arranged between the L line of the current loop communication circuit and the AC input terminal of the first switching power supply 310.

[0035] It can be understood that the current loop communication circuit in this embodiment includes an L line, an S line and an N line, wherein the L line is a live line, the N line is a neutral 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. Among them, the first switch RY1 and the second switch RY2 in this embodiment can be relays, photoelectric switches, transistors, etc., and this embodiment does not make any specific restrictions on the selection of the first switch RY1 and the second switch RY2.

[0036] In some embodiments, the first switch RY1 is a low power relay and the second switch RY2 is a high power relay.

[0037] Specifically, in the prior art, a high-power relay is generally set on the indoor main control board, resulting in the high-power relay occupying too much space on the indoor main control board, which may limit the localization and design of other functional modules, and further limit the function of the air-conditioning system. In the embodiment of the present application, 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-volume relay, a small 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, thereby saving space on the indoor main control board, reducing the space occupied by the first switch RY1 on the indoor main control board, and further reducing the cost of the indoor main control board, while ensuring the normal operation of the air-conditioning system.

[0038] In some embodiments, the auxiliary wake-up branch 400 is connected to the S line of the current loop communication circuit and the capacitor component E6 of the first switching power supply 310 on the outdoor side, wherein the auxiliary wake-up branch 400 includes a unidirectional conductive element and a voltage-dividing resistor, the positive end of the unidirectional conductive element is connected to the S line of the current loop communication circuit, the negative end of the unidirectional conductive 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 conductive element can prevent the reverse flow of current, that is, ensure that the signal can only be transmitted from the auxiliary wake-up circuit to the first switching power supply 310 to prevent the current from being transmitted in reverse, and the voltage-dividing resistor is connected to the negative end of the unidirectional conductive element, so that the auxiliary wake-up branch 400 can be stepped down, thereby providing a stable voltage.

[0039] 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. In this case, a voltage divider resistor is connected to reduce the output voltage of the auxiliary wake-up circuit to meet the operating voltage requirements of the main circuit. In addition, the unidirectional conductive element and the voltage divider resistor can also provide protection for the auxiliary wake-up branch 400 in some cases, limit the current, and prevent the auxiliary wake-up circuit from being damaged due to excessive voltage or current.

[0040] It can be understood that the unidirectional conductive element in this embodiment can be a diode such as a photodiode, a light emitting diode, etc., and this embodiment does not make any specific limitation.

[0041] 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 the disconnected state. At this time, the L line and the N line 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 board has power, and the indoor main control board enters the standby state without user operation. Therefore, the whole machine can achieve low-power standby in this state.

[0042] When the user needs cooling or heating, the mode can be switched by adjusting the opening and closing states of the first switch RY1 and the second switch RY2. The specific operation process is as follows.

[0043] It can be understood that when the air-conditioning system is in standby mode, the indoor main control board needs to wake up the outdoor main control board in the power-off state. At this time, the first switch RY1 is closed and the second switch RY2 is disconnected, so that a charging circuit is formed between the DC power supply 200 and the reference potential point through the S line and the auxiliary wake-up branch 400 to charge the capacitor component E6 of the first switching power supply 310, that is, a charging circuit is formed from the DC power supply 200-S line-auxiliary wake-up branch 400-capacitor component E6 of the first switching power supply 310-N line-reference potential point, so as to realize the charging of the capacitor component E6 of the first switching power supply 310, and further, the voltage across the capacitor component E6 of the first switching power supply 310 can be used to start the outdoor main control board to realize the wake-up of the outdoor unit.

[0044] In some embodiments, the first switching power supply 310 includes a first rectifier bridge circuit and a first transformer TR1. The first rectifier bridge circuit converts an AC signal into a DC signal to provide a stable DC output. The first rectifier bridge circuit is connected to the primary side of the first transformer TR1 to output voltage to the first transformer TR1. The capacitor component E6 of the first switching power supply 310 is connected in parallel with the secondary side of the first transformer TR1, so that different voltage outputs can be sensed according to the voltage change applied to the primary side. The stability of the output voltage is ensured by connecting the first transformer TR1 and the capacitor component E6 in parallel. The connection point between the capacitor component E6 of the first switching 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 grounded in common, so that a stable power supply can be provided to the main control chip 500, ensuring the normal operation of the main control chip 500 and the correct transmission and stability of the signal.

[0045] It can be understood that the first rectifier bridge circuit of this embodiment is connected to the primary side of the first transformer TR1, and the voltage applied to the primary side of the first transformer TR1 is changed by the voltage output by the first rectifier bridge circuit, so that the secondary side of the first transformer TR1 can sense different voltage outputs. Finally, the capacitor component E6 connected in parallel on the secondary side filters the noise in the power supply to ensure the stability of the output voltage and provide additional power supply filtering function, so as to achieve stable power supply to the main control chip 500, so as to ensure the normal operation of the main control chip 500 and protect it from interference in the power supply.

[0046] It should be noted that the first rectifier bridge circuit in this embodiment includes a first bridge arm and a second bridge arm, each bridge arm is respectively provided with a connected diode, and the input end of the first bridge arm in the first rectifier bridge circuit is connected to the N line, and the second switch RY2 is arranged between the L line and the input end of the second bridge arm.

[0047] Specifically, the first bridge arm includes a third diode D9 and a fourth diode D13, the anode of the third diode D9 is connected to 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 to 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.

[0048] Reference Figure 2 As shown, Figure 2 A schematic diagram of the current flow direction of the wake-up process provided in an embodiment of the present application.

[0049] Understandably, Figure 2 The solid arrow in the figure indicates the direction of current flow.

[0050] Depend on Figure 2 It can be seen that when the first switch RY1 is closed and the second switch RY2 is open, the current flows out from the DC power supply 200, and flows through the S line, the unidirectional conduction element and the voltage divider resistor in the auxiliary wake-up branch 400, the capacitor component E6 of the first switching power supply 310, the first rectifier bridge of the first switching power supply 310, the N line, and the reference potential point in sequence, that is, a loop of DC power supply 200-S line-unidirectional conduction element-voltage divider resistor-capacitor component E6-first bridge arm of the first rectifier bridge-N line-reference potential point is formed, thereby charging the capacitor component E6 of the first switching power supply 310. When the capacitor component E6 is fully charged, the outdoor main control board is powered and awakened from the power-off mode.

[0051] In some embodiments, the embodiment of the present application may further set the first switch RY1 between the L line of the current loop communication circuit and the reference potential point, and the second switch RY2 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 circuit for charging the capacitor component 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 from the DC power supply 200, passes through the S line, the unidirectional conduction element and the voltage divider resistor in the auxiliary wake-up branch 400 in sequence, flows to the capacitor component E6 in the first switching power supply 310, and then flows into the second bridge arm in the first rectifier bridge circuit, and then flows into the L line, and finally flows to the reference potential point through the first switch RY1, forming a DC power supply 200-S line-unidirectional conduction element-voltage divider resistor-capacitor component E6 in the first switching power supply 310-second bridge arm-L line-first switch RY1-reference potential point loop.

[0052] 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 component 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, thereby protecting the first transformer TR1 and avoiding component damage.

[0053] In some embodiments, the air conditioning system also includes an overcurrent protection circuit, so that it can detect and protect electronic equipment from damage caused by excessive current in the circuit. Specifically, the overcurrent protection circuit includes a thermistor PTC and a first zener diode DZ1. The thermistor PTC is connected in series between the auxiliary wake-up branch 400 and the cathode of the first diode D5. When the output current of the auxiliary wake-up branch 400 exceeds a certain limit value, the temperature of the thermistor PTC will increase due to heat, and the resistance will decrease, thereby reducing the voltage. The cathode of the first zener diode DZ1 is connected to the cathode of the first diode D5, and the anode of the first zener diode DZ1 is connected to the cathode of the secondary side of the first transformer TR1. When the current exceeds a certain limit value, the cathode voltage of the first diode D5 will increase, and the first zener diode DZ1 will start working to maintain a stable voltage output. Through the mutual cooperation of the thermistor PTC and the first zener 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, thereby ensuring the normal operation of the circuit and protecting the equipment from current surges or other power supply fluctuations.

[0054] It can be understood that by constructing an overcurrent protection circuit using the thermistor PTC and the first zener diode DZ1, the outdoor unit can be protected from damage caused by excessive current and overheating, while providing stable power output to ensure the normal operation of the circuit and the safety of the equipment.

[0055] It is worth noting that if the air-conditioning system fails and the second switch RY2 cannot be cut off in time, a large current will instantly flow through the thermistor PTC. The heating of the thermistor PTC will immediately disconnect the auxiliary wake-up branch 400. At the same time, the first voltage regulator diode DZ1 will clamp the voltage to protect the back-end devices. The control chip of the outdoor main control board detects that the current is too large through overcurrent and will cut off the second switch RY2 for protection.

[0056] In some embodiments, the first switching power supply 310 also includes a voltage conversion circuit 600. The connection point between the capacitor component E6 of the first switching power supply 310 and the secondary side of the first transformer TR1 is connected to the voltage input end of the voltage conversion circuit 600, so that the voltage level of the output voltage of the secondary side of the first transformer TR1 can be adjusted, the voltage conversion of the secondary side of the first transformer TR1 can be realized, and the specific requirements of the output voltage load can be ensured. 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 to the main control chip 500 of the outdoor main control board and meet the power supply requirements of the main control chip 500 of the outdoor main control board.

[0057] 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 includes 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, and the secondary side of the second transformer TR2 is connected to the DC power supply 200, that is, the DC power supply 200 is a DC power supply 200.

[0058] It should be noted that the DC power supply 200 in this embodiment is generated by a secondary winding in the second transformer TR2 of the indoor main control board, thereby eliminating additional components and circuits, reducing costs, and using fewer devices, reducing system complexity, making it easier to achieve miniaturization of the indoor main control board. Due to fewer devices and simple circuits, a more compact layout can be adopted, thereby saving space and making the indoor main control board more lightweight and compact.

[0059] It is worth noting that the second rectifier bridge in this embodiment includes a third bridge arm and a fourth bridge arm, each bridge arm is respectively provided with a connected diode, and 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.

[0060] Specifically, the third bridge arm includes a seventh diode D7 and an eighth diode D11, the anode of the seventh diode D7 is connected to the cathode of the eighth diode D11, the fourth bridge arm includes a ninth diode D8 and a tenth diode D12, the anode of the ninth diode D8 is connected to the cathode of the tenth 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 tenth diode D12.

[0061] In some embodiments, the DC power supply 200 includes a clamping capacitor E1 and a second diode D3, the positive electrode of the second diode D3 is connected to the positive electrode of the secondary side of the second transformer TR2, one end of the clamping capacitor E1 is connected to the negative electrode of the second diode D3 as the positive electrode of the DC power supply 200, and the other end of the clamping capacitor E1 is connected to the negative electrode of the secondary side of the second transformer TR2, so that the voltage can be limited to not exceed a preset value, so that the clamping voltage is kept within a safe range, thereby protecting the circuit safety and improving the reliability and stability of the circuit.

[0062] It should be noted that, in the present embodiment, the anode of the second diode D3 is connected to the anode of the secondary side of the transformer, so that the second diode D3 is turned on at a forward voltage and can limit the voltage to 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 turned on 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 the influence of excessive voltage.

[0063] In some embodiments, the air-conditioning system also 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.

[0064] Specifically, one end of the photosensitive component of the indoor data sending optocoupler IC1 is connected to the reference potential point, and the other end is connected to the cathode of the light-emitting diode in the indoor data receiving optocoupler IC3. The anode of the light-emitting diode in the indoor data receiving optocoupler IC3 is connected to the N line, and the anode of the light-emitting diode in the outdoor data receiving optocoupler IC2 is connected to the S line, and the cathode 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 this embodiment are respectively provided with optocoupler components, so that the connection status and communication status of the indoor main control board and the outdoor main control board can be determined, and the optocoupler transmission is not affected by electromagnetic interference, which improves the anti-interference ability of the communication system and further improves the stability and safety of the air-conditioning system.

[0065] In some embodiments, during the communication between the indoor main control board and the outdoor main control board, after the outdoor main control board wakes 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, and 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. 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 status or working status of the outdoor main control board can be determined through the change of the optocoupler, thereby realizing the detection of the working status of the outdoor main control board. The current flow during the communication process is shown as follows.

[0066] Reference Figure 3 As shown, Figure 3 A schematic diagram of the current flow direction during the communication process provided in an embodiment of the present application.

[0067] Understandably, Figure 3 The solid arrow in the figure indicates the direction of current flow.

[0068] Depend on Figure 3 It can be seen that after the outdoor unit is awakened, the outdoor main control board will pull in the outdoor data transmission optocoupler IC4 and wait for the command from the indoor main control board. The current flow process of the communication process at this time is: the current flows out from the DC power supply 200, flows into the outdoor data receiving optocoupler IC2 through the S line, and then to the outdoor data sending optocoupler IC4, and then flows from the N line into the indoor data receiving optocoupler IC3, and then to the indoor data sending optocoupler IC1, and finally to the reference potential point, that is, a 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-reference potential point loop is formed to complete a communication process.

[0069] It is worth noting that the current will 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 the two are in a disconnected state. Therefore, this method can save a relay, or avoid the use of double-pole or single-pole double-throw relays, further saving space on the indoor main control board, making it easier to achieve miniaturized design of the indoor main control board.

[0070] Reference Figure 4 As shown, Figure 4 A circuit diagram of an air conditioning system provided in another embodiment of the present application.

[0071] In some embodiments, the first switch RY1 can be a relay or a combination of a switch tube and a control optocoupler. When 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, and 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, and the control pin of the switch tube is connected to the photosensitive 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 off by controlling the state of the light-emitting diode in the optocoupler.

[0072] It can be understood that, taking the PNP switch tube as an example, the base of the PNP switch tube is connected to the photosensitive end in 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 turned on at a low level; when the light-emitting diode does not emit light, the PNP switch tube is cut off at a high level, thereby realizing the conduction or cutoff of the loop.

[0073] It can be understood by those skilled in the art that Figure 1-4 The schematic diagrams shown in the figure do not constitute a limitation on the embodiments of the present application, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0074] The features disclosed in the various product embodiments provided by the utility model can be arbitrarily combined without conflict to obtain new product embodiments.

[0075] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, i.e., they may be located in one place, or they may be distributed to multiple network nodes. Exemplarily, the division of units is only a logical function division, and there may be other division methods in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be ignored, or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed may be through some interfaces, indirect coupling or communication connection of devices or units, which may be electrical, mechanical, or other forms. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0076] It will be appreciated by those skilled in the art that the system disclosed above may be implemented as software, firmware, hardware, and appropriate combinations thereof. Some or all physical components may 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.

[0077] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions without violating the spirit of the present invention. These equivalent deformations or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. An air conditioning system, characterized in that: A current loop communication circuit is provided between the indoor main control board and the outdoor main control board of the air conditioning system, and the current loop communication circuit is connected to the AC input end of the first switch power supply of the outdoor main control board through the L line and the N line on the outdoor side; the air conditioning system also includes: A DC power supply, connected to the S line of the current loop communication circuit and a reference potential point on the indoor side; A first switch, connecting the N line of the current loop communication circuit and the reference potential point on the indoor side; A second switch is arranged on the outdoor side between the L line of the current loop communication circuit and the AC input terminal of the first switching power supply; An auxiliary wake-up branch is connected to the S line of the current loop communication circuit and the capacitor component of the first switching power supply on the outdoor side; when the first switch is closed and the second switch is opened, a charging circuit for charging the capacitor component of the first switching power supply is formed between the DC 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 using the voltage across the capacitor component of the first switching power supply.

2. The air conditioning system according to claim 1, characterized in that: The first switching power supply includes 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 component of the first switching power supply is connected in parallel with the secondary side of the first transformer, the connection point between the capacitor component 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.

3. The air conditioning system according to claim 2, characterized in that: The first switching power supply further includes a first diode, the anode of the secondary side of the first transformer is connected to the anode of the first diode, and the cathode of the first diode is connected to the cathode of the secondary side of the first transformer through a capacitor component of the first switching power supply.

4. The air conditioning system according to claim 3, characterized in that: The auxiliary wake-up branch includes a unidirectional conductive element and a voltage-dividing resistor, the positive end of the unidirectional conductive element is connected to the S line of the current loop communication circuit, the negative end of the unidirectional conductive element is connected to one end of the voltage-dividing resistor, and the other end of the voltage-dividing resistor is connected to the cathode of the first diode.

5. The air conditioning system according to claim 4, characterized in that: The air-conditioning system also includes an overcurrent protection circuit, which includes a thermistor and a first zener diode. The thermistor is connected in series between the auxiliary wake-up branch and the cathode of the first diode, the cathode of the first zener diode is connected to the cathode of the first diode, and the anode of the first zener diode is connected to the cathode of the secondary side of the first transformer.

6. The air conditioning system according to claim 2, characterized in that: The first switching power supply also includes a voltage conversion circuit, the connection point between the capacitor component 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.

7. The air conditioning system according to claim 1, characterized in that: The current loop communication circuit is connected to the second switching power supply of the indoor main control board through the L line and the N line on the 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 the primary side of the second transformer, and the secondary side of the second transformer is connected to the DC power supply.

8. The air conditioning system according to claim 7, characterized in that: The DC power supply includes a clamping capacitor and a second diode, the anode of the second diode is connected to the anode of the secondary side of the second transformer, one end of the clamping capacitor is connected to the cathode of the second diode as the anode of the DC power supply, and the other end of the clamping capacitor is connected to the cathode of the secondary side of the second transformer.

9. The air conditioning system according to any one of claims 1 to 8, characterized in that: 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, characterized in that: The first switch includes a switch tube and a control optocoupler, the first switch pin of the switch tube is connected to the reference potential point, the second switch pin of the switch tube is connected to the N line of the current loop communication circuit, the control pin of the switch tube is connected to the photosensitive 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.

Images