Air conditioning system
Through the combination of current loop communication circuit and clamp circuit, the problem of space limitations on indoor main control board and large size of high-power relays in air conditioning systems is solved, and the use of low-power relays is realized, saving space and reducing costs, ensuring system functions Working normally.
Patent Information
- Application Number
- CN202420972230.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-07
AI Technical Summary
In air conditioning systems, due to space limitations, it is difficult to lay out more components, and the large-power relays have large volume and height, resulting in miniaturization problems and affecting system functions and costs.
Using the current loop communication circuit, by setting the first switch and the second switch, an auxiliary wake-up branch is formed, and the clamp voltage output of the clamp circuit is used to charge the capacitor assembly of the first switching power supply, thereby providing work for the outdoor main control board. Voltage reduces the power borne by the first switch and avoids the use of high-power relays.
It saves space for layout components on the indoor main control board, reduces costs, and ensures the normal function of the air conditioning system, achieving stable wake-up and power supply of the outdoor main control board.
Smart Images
Figure CN222262243U_ABST
Abstract
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 inverter split air conditioner includes an indoor unit and an outdoor unit. The communication method between the indoor unit and the outdoor unit 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 the air conditioner needs to be on standby. If the air conditioner needs to cool or heat in the standby state, the indoor unit main control board will control the high-power relay to pull in, supply power to the outdoor unit and wake up the outdoor main control board.
[0003] As people's living standards improve, air conditioners require more and more additional functions. Due to the limited building area of houses, the size of air conditioners cannot be increased. In order to arrange more components on the indoor main control board in a limited space, it is usually necessary to miniaturize the components. However, high-power relays withstand large power, and their size and height are large, so it is 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 first switch is connected to the L line and the S line of the current loop communication circuit on the indoor side;
[0007] 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;
[0008] A clamping circuit is connected to the S line and the N line of the current loop communication circuit on the outdoor side, and the clamping voltage output end of the clamping circuit is connected to the capacitor component of the first switching power supply; when the first switch is closed and the second switch is opened, 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, and the clamping voltage output end of the clamping circuit charges the capacitor component of the first switching power supply to start the outdoor main control board using the voltage across the capacitor component of the first switching power supply.
[0009] 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.
[0010] 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.
[0011] In some embodiments, the clamping circuit includes a first resistor and a second resistor, a unidirectional conductive element, a clamping capacitor and a zener diode, one end of the first resistor is connected to the S line of the current loop communication circuit, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to the positive electrode of the unidirectional conductive element, the negative electrode of the unidirectional conductive element is connected to the negative output end of the rectifier bridge circuit, the clamping capacitor, the zener diode and the second resistor are connected in parallel, and the negative electrode of the zener diode is connected to the connection point of the first resistor and the second resistor, and the connection point of the first resistor and the second resistor is connected to the negative electrode of the first diode to provide a clamping voltage.
[0012] 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 500 of the outdoor main control board.
[0013] In some embodiments, the first switch is a low power relay and the second switch is a high power relay.
[0014] In some embodiments, the current loop communication circuit is connected to the AC input terminal of the second switching power supply of the indoor main control board through the L line and the N line on the indoor side.
[0015] In some embodiments, the second switching power supply includes a second rectifier bridge circuit and a second transformer, one end of the capacitor component of the second switching power supply is connected to the positive output end of the second rectifier bridge circuit, the other end of the capacitor component of the second switching power supply is connected to the negative output end of the second rectifier bridge circuit, and the capacitor component of the second switching power supply is connected to the primary side of the second transformer, and the secondary side of the second transformer is connected to the main control chip of the indoor main control board.
[0016] In some embodiments, the first switching power supply further includes an inductor, a first power tube and a capacitor, and the first rectifier bridge circuit, the inductor, the capacitor and the first power tube constitute a PFC circuit.
[0017] In some embodiments, the second switching power supply includes a second power tube, a first switch pin of the second power tube is connected to the primary side of the second transformer, and a second switch pin is connected to the negative output terminal of the second rectifier bridge circuit.
[0018] 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.
[0019] 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
[0020] Figure 1 A circuit diagram of an air conditioning system provided in an embodiment of the present application;
[0021] Figure 2 A schematic diagram of the current flow direction during the wake-up process provided by an embodiment of the present application;
[0022] Figure 3 A schematic diagram of the direction of current flow during the communication process provided in an embodiment of the present application. DETAILED DESCRIPTION
[0023] 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.
[0024] 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.
[0025] 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).
[0026] As people's living standards improve, air conditioners require more and more additional functions. Due to the limited building area of houses, the size of air conditioners cannot be increased. In order to arrange more components on the indoor main control board in a limited space, it is usually necessary to miniaturize the components. However, high-power relays withstand large power, and their size and height are large, so it is difficult to miniaturize the relays.
[0027] Based on this, the present embodiment provides an air-conditioning system, in which a first switch is set on the indoor side of the air-conditioning system based on the current loop communication circuit, 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, and the second switch is set on the outdoor side of the air-conditioning system, and the S line-clamping circuit-L line of the current loop communication circuit 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 opened, so that a loop from the L line of the current loop communication circuit-the first switch-the S line-the clamping circuit-the N line can be formed. At this time, the voltage outputted by the clamping voltage output terminal of the clamping circuit is The capacitor component of the first switching power supply is charged, and then the voltage across the capacitor component of the first switching 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; after the first switch and the second switch are controlled to form a main power supply loop from the L line to the N line, a secondary power supply is formed through the clamping circuit to charge the capacitor component of the first switching power supply. Since the clamping circuit is connected in series with the first switch for voltage division, the power that the first switch needs to withstand is reduced. The first switch does not need to use large-volume devices such as high-power relays, thereby saving space for layout components on the indoor main control board, so that the cost of the indoor main control board can also be lower.
[0028] Reference Figure 1 As shown, Figure 1 A circuit diagram of an air conditioning system provided in an embodiment of the present application.
[0029] 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 110 of the outdoor main control board through the L line and the N line on the outdoor side.
[0030] In some embodiments, the air conditioning system also includes a first switch RY1 arranged on the indoor side and a second switch RY2 arranged on the outdoor side, wherein the first switch RY1 connects the L line and the S line of the current loop communication circuit, so that the current loop communication circuit can be controlled to be connected or disconnected through the switching state of the first switch RY1, and the second switch RY2 is arranged between the L line of the current loop communication circuit and the AC input end of the first switching power supply 110.
[0031] 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.
[0032] 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.
[0033] In some embodiments, the clamping circuit 200 is connected to the S line and the N line of the current loop communication circuit on the outdoor side, and the clamping voltage output end of the clamping circuit 200 is connected to the capacitor component E3 of the first switching power supply 110, so that the capacitor component E3 of the first switching power supply 110 can be charged by the output voltage of the clamping voltage output end, and the capacitor component can be prevented from overvoltage, and further the capacitor can be prevented from being damaged due to overvoltage, thereby protecting the capacitor component and surrounding circuits from damage.
[0034] In some embodiments, the first switching power supply 110 includes a first rectifier bridge circuit and a first transformer TR1. The first rectifier bridge circuit is connected to the primary side of the first transformer TR1, and the first rectifier bridge circuit is also connected to the clamping circuit 200, so that it can receive the voltage output by the clamping circuit 200 and convert the AC signal into a DC signal, so that the power output is more stable. The capacitor component E3 of the first switching power supply 110 is connected in parallel with the secondary side of the first transformer TR1, so that the capacitor component can sense the voltage output of the primary side of the first transformer TR1. The connection point between the capacitor component E3 of the first switching power supply 110 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. The first rectifier bridge circuit, the first transformer TR1 and the capacitor component cooperate with each other to realize power supply to the main control chip 500 of the outdoor main control board, so that a stable voltage can be provided to the main control chip.
[0035] It can be understood that the first rectifier bridge circuit of this embodiment is connected to the clamping circuit 200 and the primary side of the first transformer TR1, so that current can flow through the first rectifier bridge circuit. At this time, voltage is applied to the primary side of the first transformer TR1. The voltage applied on the primary side changes, so that the secondary side can sense different voltage outputs. Finally, the capacitor component on the secondary side is used to achieve stable power supply to the main control chip.
[0036] It should be noted that the first rectifier bridge circuit 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 connected between the L line and the second bridge arm.
[0037] Specifically, the first bridge arm includes a third diode D3 and an eighth diode D8, the anode of the third diode D3 is connected to the cathode of the eighth diode D8, the second bridge arm includes a fourth diode D4 and a ninth diode D9, the anode of the fifth diode D7 is connected to the cathode of the ninth diode D9, and the input end of the first bridge arm is between the third diode D3 and the eighth diode D8, and the input end of the second bridge arm is between the fifth diode D7 and the ninth diode D9.
[0038] The current flow directions under different closing conditions of the first switch RY1 and the second switch RY2 are described in detail below.
[0039] 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.
[0040] Understandably, Figure 2 The solid arrow in the figure indicates the direction of current flow.
[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] Specifically, when the first switch RY1 and the second switch RY2 are both disconnected, the L line and the N line of the current loop communication circuit cannot form a loop. Although the indoor main control board has power, since the L line and the N line do not form a loop, the outdoor main control board has no power source. At this time, the outdoor unit is in standby mode, thereby achieving low-power standby mode for the air-conditioning system.
[0043] When the first switch RY1 is closed and the second switch RY2 is open, 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 200. At this time, the current flows out from the L line, flows through the S line, the clamping circuit 200 and the first bridge arm in the first rectifier bridge circuit in sequence, and finally flows into the N line. Specifically, the route of the current is L line-S line-clamping circuit 200-the eighth diode D8 in the first bridge arm-N line. Since the current flows into the first switching power supply 110 through the clamping circuit 200, the voltage output end of the clamping circuit 200 can output voltage to the first switching power supply 110, so that the voltage output by the clamping voltage output end of the clamping circuit 200 can charge the capacitor component E3 of the first switching power supply 110, so as to start the outdoor main control board with the voltage across the capacitor component E3 of the first switching power supply 110, thereby realizing stable power supply to the outdoor main control board, and then waking up the main control chip 500 of the outdoor main control board.
[0044] In some embodiments, the first switching power supply 110 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 E3 of the first switching power supply 110, 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.
[0045] It should be noted that the clamping circuit 200 in this embodiment supplies power to the low-voltage part of the secondary side of the first transformer TR1 in the outdoor main control board to achieve wake-up, and the clamping circuit 200 can reduce the power consumption of the first switching power supply 110, thereby improving the energy consumption of the air-conditioning system.
[0046] In some embodiments, the clamping circuit 200 includes a first resistor R1, a second resistor R2, a unidirectional conductive element D2, a clamping capacitor E1 and a zener diode DZ1. One end of the first resistor R1 is connected to the S line of the current loop communication circuit, the other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the positive electrode of the unidirectional conductive element D2. The first resistor R1 and the second resistor R2 cooperate to divide the voltage to achieve voltage reduction of the output clamping circuit 200. The negative electrode of the unidirectional conductive element D2 is connected to the negative output end of the rectifier bridge circuit. The clamping capacitor E1, the zener diode DZ1 and the second resistor R2 are connected in parallel, and the negative electrode of the zener diode DZ1 is connected to the connection point of the first resistor R1 and the second resistor R2, so that the stepped-down voltage can be stabilized. The connection point of the first resistor R1 and the second resistor R2 is connected to the negative electrode of the first diode D5 to provide a clamping voltage, so that the clamping voltage can be provided stably.
[0047] Specifically, in the embodiment of the present application, the input voltage is reduced to the required voltage level through the voltage division effect by the first resistor R1 and the second resistor R2, and different output voltages can be achieved by adjusting the resistance ratio of the two resistors. By connecting the positive electrode of the unidirectional conductive element D2 to the connection point of the second resistor R2, it plays a role in preventing the current from flowing in the reverse direction, determining the clamping direction, and preventing the current from flowing back to the clamping circuit 200. The clamping capacitor E1 is connected in parallel with the voltage stabilizing diode DZ1 and the second resistor R2, so as to provide a stable output voltage, wherein the clamping capacitor E1 acts as a storage device, which can provide or absorb charge when the output terminal voltage changes instantaneously to maintain the stability of the output voltage. The negative electrode of the voltage stabilizing diode DZ1 is connected to the connection point of the first resistor R1 and the second resistor R2, so as to provide a fixed clamping voltage to ensure that the output voltage is stable within a certain range. The stable provision of the clamping voltage is achieved by the mutual cooperation of the various components in the clamping circuit 200.
[0048] It is understandable that the output voltage of the clamp circuit 200 may be higher than the voltage required by the first switching power supply 110. In this case, the output voltage of the clamp circuit 200 is reduced by the cooperation of the first resistor R1 and the second resistor R2 to meet the working voltage requirements of the main circuit. In addition, the resistance values of the first resistor R1 and the second resistor R2 in this embodiment can be set according to the needs of the user, and the unidirectional conductive element D2 can be a diode such as a photodiode, a light emitting diode, etc., which is not specifically limited in this embodiment.
[0049] It is worth noting that the present embodiment can output a stable voltage through the coordination of each component in the clamping circuit 200, and then the voltage outputted by the clamping voltage output terminal of the clamping circuit 200 is used to charge the capacitor component E3 of the first switching power supply 110, and then the voltage across the capacitor component E3 of the first switching power supply 110 is used to provide a working voltage for the main control chip 500 of the outdoor main control board, thereby waking up the outdoor unit. After the main power supply loop from the L line to the N line is formed by controlling the first switch RY1 and the second switch RY2, the auxiliary power supply is formed by the clamping circuit 200 to charge the capacitor component E3 of the first switching power supply 110. Since the clamping circuit 200 and the first switch RY1 are connected in series to divide the voltage, the power that the first switch RY1 needs to bear is reduced. The first switch RY1 does not need to use large-volume devices such as high-power relays, so it can save space for layout components on the indoor main control board, so that the cost of the indoor main control board can also be lower.
[0050] The current flow direction is described in detail below in combination with specific components of the clamp circuit 200 and the states of the first switch RY1 and the second switch RY2.
[0051] When the first switch RY1 and the second switch RY2 are both closed, the operation of the entire current is not affected because the unidirectional conducting element D2 plays a protective role to prevent the current from flowing back into the clamping circuit 200 and burning the Zener diode DZ1. Specifically, in the positive half cycle of the alternating current, 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 200. At this time, the current flows out from the L line, flows through the S line, the clamping circuit 200 and the first switching power supply 110 in sequence, and finally flows into the N line. Since the current flows into the first switching power supply 110 through the clamping circuit 200, the voltage output end of the clamping circuit 200 can output a voltage to the first switching power supply 110, so that the voltage output by the clamping voltage output end of the clamping circuit 200 can charge the capacitor component E3 of the first switching power supply 110; in the negative half cycle of the alternating current, the current flows out from the N line, flows through the first switching power supply 110, and then flows to the clamping circuit 200. However, since the negative electrode of the unidirectional conductive element D2 in the clamping circuit 200 is connected to the negative output end of the rectifier bridge circuit, the current cannot reversely pass through the unidirectional conductive element D2, thereby ensuring that the current flows in the same direction and preventing the current from reversely flowing into the clamping circuit 200 and burning the voltage regulator diode DZ1.
[0052] 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.
[0053] Specifically, one end of the photosensitive component of the indoor data sending optocoupler IC1 is connected to the N line, 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 S line, and the anode of the light-emitting diode in the outdoor data receiving optocoupler IC2 is connected to the N 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.
[0054] 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.
[0055] 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.
[0056] Understandably, Figure 3 The solid arrow in the figure indicates the direction of current flow.
[0057] After the outdoor main control board has been awakened, when the first switch RY1 is disconnected and the second switch RY2 is closed, the current will flow out from the power supply at one end of the capacitor component and flow to the clamping circuit 200. Since there is a voltage difference between the unidirectional conductive element D2 in the clamping circuit 200 and the outdoor main control board, the voltage-stabilizing diode DZ1 in the clamping circuit 200 will not reversely break down. The current flows through the first resistor R1, the S line, the indoor data receiving optocoupler IC3 and the indoor data sending optocoupler IC1 in sequence, and finally flows into the N line, and then returns to the 0 volt potential point after passing through the outdoor data receiving optocoupler IC2 and the outdoor data sending optocoupler IC4, completing the current flow of the entire communication process, that is, the current flow path in the communication process is: the power supply at one end of the capacitor component-clamping circuit 200-S line-indoor data receiving optocoupler IC3-indoor data sending optocoupler IC1-N line-outdoor data receiving optocoupler IC2-outdoor data sending optocoupler IC4-0 volt potential point.
[0058] In some embodiments, the first switching power supply 110 also includes a voltage conversion circuit 300. The connection point between the capacitor component E3 of the first switching power supply 110 and the secondary side of the first transformer TR1 is connected to the voltage input end of the voltage conversion circuit 300, 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 300 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.
[0059] In some embodiments, the current loop communication circuit is connected to the AC input end of the second switching power supply 120 of the indoor main control board through the L line and the N line on the indoor side. The second switching power supply 120 includes a second rectifier bridge circuit and a second transformer TR2. One end of the capacitor component E2 of the second switching power supply 120 is connected to the positive output end of the second rectifier bridge circuit, and the other end of the capacitor component E2 of the second switching power supply 120 is connected to the negative output end of the second rectifier bridge circuit. The capacitor component E2 of the second switching power supply 120 is connected to the primary side of the second transformer TR2, and the secondary side of the second transformer TR2 is connected to the main control chip of the indoor main control board, so that the AC signal can be converted into a DC signal through the second rectifier bridge circuit. The capacitor component E2 of the second switching power supply 120 is connected to the positive output end and the negative output end of the second rectifier bridge circuit, so that the fluctuation of the output voltage can be smoothed. The primary side of the second transformer TR2 is connected to the capacitor component to determine the voltage across the capacitor component, so that the secondary side of the second transformer TR2 can sense different voltage outputs according to the voltage change of the primary side, thereby realizing stable power supply to the main control chip of the indoor main control board.
[0060] Specifically, the second rectifier bridge circuit 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 fourth bridge arm is connected to the L line. The third bridge arm includes a sixth diode D6 and a tenth diode D10, and the anode of the sixth diode D6 is connected to the cathode of the tenth diode D10. The fourth bridge arm includes a seventh diode D7 and an eleventh diode D11, and the anode of the seventh diode D7 is connected to the cathode of the eleventh diode D11. The input end of the third bridge arm is between the sixth diode D6 and the tenth diode D10, and the input end of the fourth bridge arm is between the seventh diode D7 and the eleventh diode D11.
[0061] In some embodiments, in most cases, the phase difference between current and voltage is large. Low power factor will lead to an increase in grid load, reduce the utilization rate of electric energy, and increase energy waste. Therefore, the first switching power supply 110 in this embodiment also includes an inductor L3, a first power tube Q1 and a capacitor E5. The first rectifier bridge circuit, the inductor L3, the capacitor E5 and the first power tube Q1 form a PFC (Power Factor Correction Circuit) circuit 400, so that the phase relationship between current and voltage can be adjusted to make it as close to the same phase as possible, thereby improving the power factor, reducing the loss of reactive power, and further improving the stability and reliability of the output voltage.
[0062] Specifically, one end of the inductor L3 in this embodiment is connected to the positive output end of the first rectifier bridge circuit, and the other end is connected to the primary side of the first transformer TR1. The first power tube Q1 in this embodiment can be a triode or a MOS tube. Taking the first power tube Q1 as a MOS tube as an example, the drain of the first power tube Q1 is connected between the inductor L3 and the primary side of the first transformer TR1, and the source is connected between the negative output end of the first rectifier bridge circuit and the primary side of the first transformer TR1. The capacitor E5 is connected in parallel with the inductor L3, that is, one end of the capacitor E5 is connected between the inductor L3 and the primary side of the first transformer TR1, and the other end is connected between the negative output end of the first rectifier bridge circuit and the primary side of the first transformer TR1.
[0063] In some embodiments, the second switching power supply also includes a second power tube Q2, the first switch pin of the second power tube Q2 is connected to the primary side of the second transformer TR2, and the second switch pin is connected to the negative output end of the second rectifier bridge circuit. Similarly, the second power tube Q2 in this embodiment can be a triode or a MOS tube, and this embodiment does not make any specific restrictions on the selection of the first power tube Q1 and the second power tube Q2.
[0064] In some embodiments, the first switch RY1 of the embodiment of the present application connects the L line and the S line of the current loop communication circuit, and the second switch RY2 is arranged between the L line and the input end of the second bridge arm in the first rectifier bridge circuit. When the first switch RY1 is closed and the second switch RY2 is opened, 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 200. In the positive half cycle of the alternating current, the current flows out from the L line, passes through the first switch RY1, the S line, the clamping circuit 200, the first switching power supply 110 in sequence, and finally flows into the N line, forming a loop of L line-first switch RY1-S line-clamping circuit 200-the eighth diode D8 in the first bridge arm-N line.
[0065] In the embodiment of the present application, the first switch RY1 can also be set between the N line and the S line, that is, the N line and the S line of the current loop communication circuit are connected through the first switch RY1, and the second switch RY2 is set 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, the L line and the N line of the current loop communication circuit can also form a loop through the S line and the clamping circuit 200. Specifically, in the negative half cycle of the alternating current, the current flows out from the N line. At this time, since the first switch RY1 is closed, the current can directly flow into the S line through the first switch RY1, and then flow into the clamping circuit 200. At this time, the voltage output through the clamping voltage output terminal of the clamping circuit 200 charges the capacitor component E3 of the first switching power supply 110. Then the current flows into the second bridge arm of the first rectifier bridge circuit, and finally flows into the L line, thereby forming a loop of the N line-first switch RY1-S line-clamping circuit 200-the ninth diode D9 in the second bridge arm-L line. The auxiliary power supply can be formed through the clamping circuit 200 to charge the capacitor component E3 of the first switching power supply 110, and then the voltage across the capacitor component E3 of the first switching power supply 110 is used to provide a working voltage for the main control chip 500 of the outdoor main control board, thereby waking up the outdoor unit.
[0066] It can be understood that this embodiment can realize waking up the outdoor unit through the above two methods, and this embodiment does not make any specific restrictions on the circuit setting of the air-conditioning system.
[0067] It can be understood by those skilled in the art that Figure 1-3 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.
[0068] The features disclosed in the various product embodiments provided by the utility model can be arbitrarily combined without conflict to obtain new product embodiments.
[0069] 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.
[0070] 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.
[0071] 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 first switch is connected to the L line and the S line of the current loop communication circuit 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; A clamping circuit is connected to the S line and the N line of the current loop communication circuit on the outdoor side, and the clamping voltage output end of the clamping circuit is connected to the capacitor component of the first switching power supply; when the first switch is closed and the second switch is opened, 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, and the clamping voltage output end of the clamping circuit charges the capacitor component of the first switching power supply 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 clamping circuit includes a first resistor and a second resistor, a unidirectional conductive element, a clamping capacitor and a zener diode, one end of the first resistor is connected to the S line of the current loop communication circuit, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is connected to the positive electrode of the unidirectional conductive element, the negative electrode of the unidirectional conductive element is connected to the negative output end of the rectifier bridge circuit, the clamping capacitor, the zener diode and the second resistor are connected in parallel, and the negative electrode of the zener diode is connected to the connection point of the first resistor and the second resistor, and the connection point of the first resistor and the second resistor is connected to the negative electrode of the first diode to provide a clamping voltage.
5. The air conditioning system according to claim 3, characterized in that: The first switching power supply further comprises a voltage conversion circuit, wherein a connection point between a capacitor component of the first switching power supply and a 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 a main control chip (500) of the outdoor main control board.
6. The air conditioning system according to any one of claims 1 to 5, characterized in that: The first switch is a low power relay, and the second switch is a high power relay.
7. The air conditioning system according to claim 1, characterized in that: The current loop communication circuit is connected to the AC input terminal of the second switch power supply of the indoor main control board through the L line and the N line on the indoor side.
8. The air conditioning system according to claim 7, characterized in that: The second switching power supply includes a second rectifier bridge circuit and a second transformer, one end of the capacitor component of the second switching power supply is connected to the positive output end of the second rectifier bridge circuit, the other end of the capacitor component of the second switching power supply is connected to the negative output end of the second rectifier bridge circuit, and the capacitor component of the second switching power supply is connected to the primary side of the second transformer, and the secondary side of the second transformer is connected to the main control chip of the indoor main control board.
9. The air conditioning system according to claim 2, characterized in that: The first switching power supply further includes an inductor, a first power tube and a capacitor. The first rectifier bridge circuit, the inductor, the capacitor and the first power tube form a PFC circuit.
10. The air conditioning system according to claim 8, characterized in that: The second switching power supply includes a second power tube, a first switch pin of the second power tube is connected to the primary side of the second transformer, and a second switch pin is connected to the negative output end of the second rectifier bridge circuit.