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 auxiliary wake-up branch is connected with an S line of the current loop communication circuit and a capacitor assembly of the first switching power supply on the outdoor side; the current loop communication circuit comprises an indoor data sending optocoupler, and a light sensing end of the indoor data sending optocoupler is connected with a reference potential point and an N line of the current loop communication circuit; under the condition that the power supply switch is switched off and the photosensitive end of the indoor data sending optocoupler is switched on, an energy charging loop for charging the capacitor assembly of the first switching power supply is formed between the direct current power supply and the reference potential point through an S line of the current loop communication circuit and the auxiliary wake-up branch; and the outdoor main control board is started by utilizing voltage at two ends of the capacitor assembly of the first switching power supply. By arranging the auxiliary wake-up branch and the current loop communication circuit, the space for arranging elements on the indoor main control board can be saved.

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] Inverter split air conditioners, 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 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] An embodiment of the present application provides an air-conditioning system that can save space for layout of components on an indoor main control board.

[0005] The utility model provides an air-conditioning system, wherein a current loop communication circuit is arranged between an indoor main control board and an outdoor main control board of the air-conditioning system, and the current loop communication circuit is connected to an AC input end of a first switch 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: a DC power supply, connected to an S line and a reference potential point of the current loop communication circuit on the indoor side; an auxiliary wake-up branch, connected to an S line of the current loop communication circuit and a capacitor component of the first switch power supply on the outdoor side; a power switch, arranged between the L line of the current loop communication circuit and the AC input end of the first switch power supply on the outdoor side; the current loop communication circuit comprises an indoor data transmission optocoupler, and a photosensitive end of the indoor data transmission optocoupler is connected to the reference potential point and the N line of the current loop communication circuit; when the power switch is disconnected and the photosensitive end of the indoor data transmission optocoupler is turned on, a charging circuit for charging the capacitor component of the first switch power supply is formed between the DC power supply and the reference potential point through the S line of the current loop communication circuit and the auxiliary wake-up branch, so as to start the outdoor main control board using the voltage across the capacitor component of the first switch power supply.

[0006] The air-conditioning system provided by the embodiment of the utility model has at least the following beneficial effects: the embodiment of the present application is provided with a DC power supply and an auxiliary wake-up branch, and can charge the capacitor component by turning on the DC power supply, the S line and the auxiliary wake-up branch through the indoor data sending optocoupler when the outdoor main control board is on standby, and quickly start the outdoor main control board through the capacitor component, thereby improving the efficiency of waking up the outdoor main control board, saving space for layout components on the indoor main control board, reducing the production cost of the indoor main control board, and improving the anti-interference ability of the air-conditioning system.

[0007] In the above-mentioned air-conditioning system, 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.

[0008] In the above-mentioned air-conditioning system, the first switching power supply also 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 the capacitor component of the first switching power supply.

[0009] In the above-mentioned air-conditioning system, the auxiliary wake-up branch includes a unidirectional conducting element and a voltage-dividing resistor, the positive end of the unidirectional conducting element is connected to the S line of the current loop communication circuit, the negative end of the unidirectional conducting 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.

[0010] In the above-mentioned air-conditioning system, 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.

[0011] In the above-mentioned air-conditioning system, 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.

[0012] In the above-mentioned air-conditioning system, the DC power supply includes a clamping capacitor and a second diode, the positive electrode of the first 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 first 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.

[0013] In the above-mentioned air-conditioning system, the current loop communication circuit also includes a first resistor and an indoor data receiving optocoupler, the light-emitting end of the indoor data receiving optocoupler is connected in parallel with the first resistor, and the light-emitting end of the indoor data receiving optocoupler is connected to the N line of the current loop communication circuit and the photosensitive end of the indoor data sending optocoupler.

[0014] In the above-mentioned air-conditioning system, the air-conditioning system also includes a charging detection module, the sampling end of the charging detection module is connected to the photosensitizing end of the indoor data receiving optocoupler, and the output end of the charging detection module is used to output a charging signal corresponding to the charging current in the charging circuit.

[0015] In the above-mentioned air conditioning system, the air conditioning system further comprises a signal amplifying and shaping circuit, and an input end of the signal amplifying and shaping circuit is connected to a photosensing end of the indoor data receiving optocoupler.

[0016] In the above-mentioned air-conditioning system, the signal amplification and shaping circuit includes a switching tube and a second resistor, the first switch pin of the switching tube is connected to a constant voltage source through the second resistor, the second switch pin of the switching tube is grounded, the control pin of the switching tube is connected to the input end of the signal amplification and shaping circuit, and the connection point between the first switch pin of the switching tube and the second resistor is connected to the output end of the signal amplification and shaping circuit.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0019] Figure 1 This is a circuit diagram of an air conditioning system provided by an embodiment of the utility model;

[0020] Figure 2 This is a circuit structure diagram of an air conditioning system in a wake-up state provided by an embodiment of the utility model;

[0021] Figure 3 It is a circuit structure diagram of an air conditioning system in a communication state provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of the present utility model, "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 the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] The embodiment of the utility model provides an air-conditioning system, which is equipped with a first temperature sensor and a compressor so that the control panel can accurately control the start and stop time of the compressor according to the target size of the ice cubes and the water temperature, thereby avoiding the situation where the ice cubes cannot meet the usage requirements due to the ice making time being too short or too long, and then accurately controlling the size of the ice cubes to ensure the uniformity of the ice cube size.

[0027] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0028] See also Figure 1 , Figure 1 FIG. 1 shows a circuit diagram of an air conditioning system provided by an embodiment of the utility model. Figure 1As shown, a current loop communication circuit 120 is arranged between the indoor main control board 100 and the outdoor main control board 200 of the air-conditioning system provided in the embodiment of the present application, and the current loop communication circuit 120 is connected to the AC input end of the first switch power supply 210 of the outdoor main control board 200 through the L line and the N line on the outdoor side; the air-conditioning system also includes: a DC power supply 110, connected to the S line and the reference potential point of the current loop communication circuit 120 on the indoor side; an auxiliary wake-up branch 220, connected to the S line of the current loop communication circuit 120 and the capacitor component E6 of the first switch power supply 210 on the outdoor side; a power switch 230, arranged on the outdoor side at the L line of the current loop communication circuit 120 line to the AC input terminal of the first switching power supply 210; the current loop communication circuit 120 includes an indoor data sending optocoupler IC1, and the photosensitive end of the indoor data sending optocoupler IC1 is connected to the reference potential point and the N line of the current loop communication circuit; when the power switch 230 is disconnected and the photosensitive end of the indoor data sending optocoupler IC1 is turned on, a charging circuit for charging the capacitor component E6 of the first switching power supply 210 is formed between the DC power supply 110 and the reference potential point through the S line of the current loop communication circuit 120 and the auxiliary wake-up branch 220, so as to use the voltage across the capacitor component E6 of the first switching power supply 210 to start the outdoor main control board 200.

[0029] By setting up a DC power supply 110 and an auxiliary wake-up branch 220, when the outdoor main control board 200 is in standby mode, the DC power supply 110, the S line and the auxiliary wake-up branch 220 can be turned on through the indoor data sending optocoupler IC1 to charge the capacitor component E6, and the outdoor main control board 200 can be quickly started through the capacitor component E6, thereby improving the efficiency of waking up the outdoor main control board 200, saving space for layout components on the indoor main control board 100, reducing the production cost of the indoor main control board 100, and improving the anti-interference ability of the air-conditioning system.

[0030] It can be understood that the indoor main control board 100 is connected to the outdoor main control board 200 through three wires, namely L line, N line, and S line. L1, N1, and S1 on the indoor main control board 100 side are wiring terminals, and L2, N2, and S2 on the outdoor main control board 200 side are wiring terminals.

[0031] The existing air conditioner outdoor unit usually adopts a current loop communication module and a power supply control circuit. After the outdoor unit is powered on, the current loop communication module controls the output end of the power supply circuit to output the power supply so that the main controller and other loads in the outdoor unit can be powered on and work. After the indoor unit sends a shutdown signal to the outdoor unit, the main controller controls the load in the outdoor unit to stop working, and the current loop communication module stops working, that is, the indoor unit sends a shutdown signal to the outdoor unit so that the output end of the power supply circuit stops outputting the power supply, thereby cutting off the power supply to the main controller and other loads in the outdoor unit, so that the power consumption of the outdoor unit when it is in standby or accidentally disconnects communication with the indoor unit and shuts down safely is reduced, thereby reducing the standby power of the air conditioner to meet the low energy consumption requirements. This structure requires that a high-power relay be set on the indoor unit side. In the standby state, the power supply of the outdoor unit is disconnected to achieve low-power standby; when cooling and heating are required, the high-power relay is energized to wake up the outdoor unit from the power-off state and enter the cooling or heating state. This greatly increases the structural complexity of the indoor unit main control board, making it difficult to miniaturize the indoor unit main control board, and affecting the production cost and layout convenience of the indoor unit main control board.

[0032] It is understandable that if Figure 1 As shown, the indoor data transmission optocoupler IC1, the outdoor data receiving optocoupler IC2, the indoor data receiving optocoupler IC3 and the outdoor data transmission optocoupler IC4 form a current loop communication circuit 120. The power supply of the current loop communication circuit 120 comes from the 24V voltage generated by the DC power supply 110, and the voltage is loaded on the S line. Since the DC power supply 110 is generated by a secondary winding in the second transformer TR2 in the indoor main control board 100, its cost is low and the number of devices used to generate 24V is small, which is more conducive to the miniaturization of the indoor main control board 100.

[0033] See also Figure 2 , Figure 2 FIG. 1 shows a circuit structure diagram of an air conditioning system in an awake state provided by an embodiment of the utility model. Figure 2 As shown, in the air-conditioning system provided by the embodiment of the present application, when the power switch 230 is disconnected and the photosensitive end of the indoor data sending optocoupler IC1 is turned on, a charging circuit for charging the capacitor component E6 of the first switching power supply 210 is formed between the DC power supply 110 and the reference potential point through the S line of the current loop communication circuit 120 and the auxiliary wake-up branch 220.

[0034] In actual application, when the user needs cooling or heating, the indoor main control board 100 needs to wake up the outdoor main control board 200 in the power-off state, and needs to charge the capacitor component E6 of the first switch power supply 210. At this time, by turning on the indoor data transmission optocoupler IC1, the maximum conduction current of the indoor data transmission optocoupler IC1 is 60mA. At this time, the current flow direction is as follows Figure 2As shown, the current flows from the DC power supply 110 through S1 to S2, through the auxiliary energized unidirectional conductive element D4, the first diode D5, through E6, through the thermal ground into D13 in the first rectifier bridge circuit 211, through N2 to N1, and then through the indoor data receiving optocoupler IC3 to the indoor data sending optocoupler IC1, and returns to the reference potential point of the DC power supply 110, completing the charging of the capacitor component E6 of the first switching power supply 210. Specifically, the capacitance of the capacitor component E6 is 2000u. According to the capacitor charging formula: C*U=I*t, the constant current charging is performed at a current of 50mA in the charging circuit. The charging time is calculated as shown in the following formula: T=12*2000*10 -6 / 50*10 -3 =0.48s. Therefore, the capacitor component E6 of the first switching power supply 210 is quickly charged through the charging loop formed by the S line of the current loop communication circuit 120 and the auxiliary wake-up branch 220 between the DC power supply 110 and the reference potential point, which can quickly power the outdoor main control board 200 and improve the operating efficiency of the air conditioning system.

[0035] See also Figure 3 , Figure 3 FIG. 2 shows a circuit structure diagram of an air conditioning system in a communication state provided by an embodiment of the utility model. Figure 3 As shown, the indoor data transmission optocoupler IC1, the outdoor data receiving optocoupler IC2, the indoor data receiving optocoupler IC3 and the outdoor data transmission optocoupler IC4 form a current loop communication circuit 120. The indoor main control board 100 sends a communication signal to the outdoor main control board 200 through the indoor data transmission optocoupler IC1, the outdoor main control board 200 receives the signal through the indoor data receiving optocoupler IC3 and processes it, and sends a response signal to the indoor data transmission optocoupler IC1 through the outdoor data transmission optocoupler IC4, and the indoor main control board 100 receives the response signal through the outdoor data receiving optocoupler IC2 and processes it.

[0036] It is understandable that when the outdoor main control board 200 is awakened, the light-sensing end of the outdoor data transmission optocoupler IC4 is turned on, waiting to receive the command of the indoor main control board 100. The current flow of the communication process at this time is as follows: Figure 3As shown, the current flows out from the output end of the DC power supply 110, passes through S1 to S2, flows into the outdoor data receiving optocoupler IC2, and then to the outdoor data sending optocoupler IC4, passes through D2, and then flows from N2 to N1, and then flows from N1 to the indoor data receiving optocoupler IC3, and reaches the indoor data sending optocoupler IC1, forming a loop, and completing a communication process. In this process, the current will not or only a small amount of current will flow into the first rectifier bridge circuit 211 through the auxiliary wake-up branch 220, because the first rectifier bridge circuit 211 does not form a loop with the DC power supply 110, and the two are in a disconnected state. Therefore, this structure can save a relay on the indoor main control board 100 side, or avoid using double-pole or single-pole double-throw relays, thereby reducing the production cost of the indoor main control board 100.

[0037] In other embodiments, the first switching power supply 210 includes a first rectifier bridge circuit 211 and a first transformer TR1, the first rectifier bridge circuit 211 is connected to the primary side of the first transformer TR1, the capacitor component E6 of the first switching power supply 210 is connected in parallel with the secondary side of the first transformer TR1, the connection point between the capacitor component E6 of the first switching power supply 210 and the secondary side of the first transformer TR1 is connected to the main control chip 240 of the outdoor main control board 200, and the primary side and the secondary side of the first transformer TR1 are grounded.

[0038] It can be understood that the first rectifier bridge circuit 211 is a rectifier circuit (rectifying circuit), which is connected by four diodes (D9, D10, D13, D14) into a bridge structure, and its function is to convert the AC power output by the AC transformer circuit into a unidirectional pulsating DC power. The first rectifier bridge circuit 211 is connected to the primary side of the first transformer TR1, the capacitor component E6 is connected in parallel with the secondary side of the first transformer TR1, and the connection point between the capacitor component E6 and the secondary side of the first transformer TR1 is connected to the main control chip 240 of the outdoor main control board 200. This structure can power and wake up the main control chip 240 while ensuring that the capacitor component E6 is fully charged. It also enables the first rectifier bridge circuit 211 to convert the AC power of the main power into DC power when the first switching power supply 210 is connected to the main power, and after the voltage is adjusted by the first transformer TR1, it supplies power to the main control chip 240 of the outdoor main control board 200, so as to avoid the situation where the power of the capacitor component E6 decreases and the main control chip 240 is powered off.

[0039] In other embodiments, the first switching power supply 210 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 210.

[0040] It can be understood that a diode is an electronic device made of semiconductor materials (silicon, selenium, germanium, etc.). A diode has two electrodes, a positive electrode, also called an anode; and a negative electrode, also called a cathode. When a forward voltage is applied between the two electrodes of the diode, the diode is turned on, and when a reverse voltage is applied, the diode is cut off. Therefore, the conduction and cutoff of the diode are equivalent to the on and off of the switch. A first diode D5 is provided on the first switching power supply 210, and 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 secondary side of the first transformer TR1 is connected to the negative electrode of the first diode D5 through the capacitor component E6. Figure 2 As shown, when the power switch 230 is disconnected, the charging loop formed by the S line of the current loop communication circuit 120 and the auxiliary awakening branch 220 between the DC power supply 110 and the reference potential point charges the capacitor component E6 of the first switch power supply 210. At this time, since the cathode of the first diode D5 is connected to the capacitor component E6, a reverse voltage is applied between the two electrodes of the first diode D5, and the first diode D5 is in a cut-off state. The current cannot pass through the first diode D5, and then flows through the capacitor component E6 to D13 in the first rectifier bridge circuit 211, forming an energy charging loop to ensure the charging efficiency of the capacitor component E6 during the awakening process. Figure 3 As shown, when the outdoor main control board 200 is awakened and the power switch 230 is closed, the first transformer TR1 outputs a forward voltage to the first diode D5, and the first diode D5 is in a conducting state. Current can flow to the main control chip 240 through the first diode D5, so as to achieve a stable power supply effect for the main control chip 240.

[0041] In other embodiments, the auxiliary wake-up branch 220 includes a unidirectional conductive element D4 and a voltage-dividing resistor R5, the positive end of the unidirectional conductive element D4 is connected to the S line of the current loop communication circuit 120, the negative end of the unidirectional conductive element D4 is connected to one end of the voltage-dividing resistor R5, and the other end of the voltage-dividing resistor R5 is connected to the cathode of the first diode D5.

[0042] It can be understood that a voltage-dividing resistor refers to the resistance of a conductor connected in series with a circuit. When the total voltage remains unchanged, a voltage-dividing resistor connected in series with a circuit will play a role in voltage division. Part of the voltage will drop on the voltage-dividing resistor, reducing the voltage across the circuit. Figure 2 As shown, in order to ensure that the voltage in the charging circuit matches the charging voltage of the capacitor component E6, a voltage divider resistor R5 needs to be set in the charging circuit to ensure the charging efficiency of the capacitor component E6 and the stability of the charging voltage, and to avoid overvoltage on both sides of the capacitor component E6 and damage to the capacitor component E6. Specifically, the unidirectional conductive element D4 is a diode, such as Figure 2As shown, when the power switch 230 is disconnected, the capacitor component E6 of the first switch power supply 210 is charged through the charging loop formed by the S line of the current loop communication circuit 120 and the auxiliary wake-up branch 220 between the DC power supply 110 and the reference potential point. At this time, since the positive end of the unidirectional conductive element D4 is connected to the S line of the current loop communication circuit 120, and the negative end of the unidirectional conductive element D4 is connected to the cathode of the first diode D5, both sides of the unidirectional conductive element D4 are positive voltages, the unidirectional conductive element D4 is in the on state, and the current can flow through the unidirectional conductive element D4 to the voltage divider resistor R5 and the capacitor component E6; Figure 3 As shown, when the outdoor main control board 200 wakes up and the power switch 230 is closed, the first transformer TR1 outputs a reverse voltage to the unidirectional conducting element D4 through the first diode D5, and the unidirectional conducting element D4 is in a cut-off state. The current cannot pass through the unidirectional conducting element D4, thereby preventing the current from entering the current loop communication circuit 120, affecting the normal communication between the indoor main control board 100 and the outdoor main control board 200 of the air-conditioning system, and ensuring the operating stability of the air-conditioning system.

[0043] In other embodiments, the first switching power supply 210 also includes a voltage conversion circuit 212, the connection point between the capacitor component E6 of the first switching power supply 210 and the secondary side of the first transformer TR1 is connected to the voltage input end of the voltage conversion circuit 212, and the voltage output end of the voltage conversion circuit 212 is connected to the main control chip 240 of the outdoor main control board 200.

[0044] It is understandable that when the power switch 230 is closed, the first transformer TR1 supplies power to the main control chip 240 of the outdoor main control board 200 through the first diode D5. In order to ensure that the voltage applied by the first transformer TR1 to the main control chip 240 can adapt to the working voltage of the main control chip 240, it is necessary to set a voltage conversion circuit 212 between the secondary side of the first transformer TR1 and the main control chip 240. Specifically, the DC voltage converter is used to convert the voltage of the DC power supply into the required voltage and current, mainly including different types such as boost, buck, buck-boost, and inversion. For example, the core component of the boost and buck converter is the converter, which obtains the required output voltage by adjusting the input voltage; the inverting converter realizes voltage conversion by changing the positive and negative polarity of the DC power supply. In practical applications, the voltage conversion circuit 212 can realize voltage conversion by setting a low dropout (LowDropout, LDO) regulator, a voltage regulator diode, a plurality of diodes connected in series, and other structures, which will not be described here.

[0045] In other embodiments, the current loop communication circuit 120 is connected to the second switching power supply 130 of the indoor main control board 100 through the L line and the N line on the indoor side. The second switching power supply 130 includes a second rectifier bridge circuit 131 and a second transformer TR2. The second rectifier bridge circuit 131 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 110.

[0046] It can be understood that, similar to the structure of the first switching power supply 210, the second switching power supply 130 of the current loop communication circuit 120 is provided with a second rectifier bridge circuit 131 and a second transformer TR2, so that a stable DC voltage is applied to the current loop communication circuit 120. In practical applications, the DC power supply 110 can be generated by a secondary winding of an existing main transformer in the indoor main control board 100, and the second switching power supply 130 is connected to the main power supply, and outputs a stable DC current to the outside through the second rectifier bridge circuit 131 and the second transformer TR2. In this way, the production cost of the DC power supply 110 is low and the number of practical devices for generating a 24V voltage is small, which is more conducive to the miniaturization of the indoor main control board 100.

[0047] In other embodiments, the DC power supply 110 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 110, and the other end of the clamping capacitor E1 is connected to the negative electrode of the secondary side of the second transformer TR2.

[0048] It can be understood that the working principle of the capacitor clamp is based on the basic principle of the capacitor. When the capacitor clamp is connected to a power supply voltage, an electric field is formed between the metal plates. The strength of the electric field is proportional to the power supply voltage and inversely proportional to the distance between the metal plates. When the power supply voltage is stable, the electric field strength of the capacitor clamp stabilizes. When an unknown capacitor is connected between the two metal plates of the capacitor clamp, the unknown capacitor will share the electric field with the capacitor clamp. Since the electric field strength is proportional to the capacitance value, the electric field strength of the unknown capacitor will also stabilize, and the value of the unknown capacitor can be indirectly measured by measuring the voltage of the capacitor clamp. The clamp capacitor is installed in the feedback loop and plays a role in filtering and voltage stabilization; in addition, the clamp capacitor blocks high-frequency noise and filters out interference signals that appear in the output signal. At the same time, when the input signal bias voltage changes, the clamp capacitor can play a role in stabilizing the voltage and maintaining the stability of the output signal. Therefore, the clamp capacitor E1 is mainly responsible for filtering and voltage stabilization in the DC power supply 110 to prevent the instability of the bias voltage at the output end of the second transformer TR2. A clamping capacitor E1 and a second diode D3 are provided in the DC power supply 110, and one end of the clamping capacitor E1 is connected to the cathode of the second diode D3 as the anode of the DC power supply 110, which can ensure the stability of the DC voltage output by the DC power supply 110. Similarly, the second diode D3 plays a role of voltage stabilization and rectification in the DC power supply 110, further ensuring the output stability of the DC power supply 110.

[0049] In other embodiments, the current loop communication circuit 120 also includes a first resistor R1 and an indoor data receiving optocoupler IC3, the light-emitting end of the indoor data receiving optocoupler IC3 is connected in parallel with the first resistor R1, and the light-emitting end of the indoor data receiving optocoupler IC3 is connected to the N line of the current loop communication circuit and the photosensitive end of the indoor data sending optocoupler IC1.

[0050] It can be understood that in order to ensure that a charging loop for charging the capacitor component E6 of the first switching power supply 210 is formed between the DC power supply 110 and the reference potential point through the S line of the current loop communication circuit 120 and the auxiliary wake-up branch 220, a first resistor R1 is set between the indoor data sending optocoupler IC1 and the indoor data receiving optocoupler IC3 to ensure the voltage stability across the indoor data receiving optocoupler IC3 during the charging process of the capacitor component E6, so as to avoid damage to the indoor data receiving optocoupler IC3 due to excessive voltage, thereby affecting the operating stability of the air-conditioning system.

[0051] In other embodiments, the air conditioning system also includes a charging detection module 140, the sampling end of the charging detection module 140 is connected to the photosensing end of the indoor data receiving optocoupler IC3, and the output end of the charging detection module 140 is used to output a charging signal corresponding to the charging current in the charging circuit.

[0052] It is understandable that, during the charging process of the capacitor component E6, in order to ensure that the indoor main control board 100 can monitor the current size in the charging circuit in real time to determine the charging status of the capacitor component E6, the photosensitive end of the indoor data receiving optocoupler IC3 is connected to the sampling end of the charging detection module 140, and the charging signal corresponding to the charging current in the charging circuit is output through the output end of the charging detection module 140. Specifically, the output current of the photosensitive end of the indoor data receiving optocoupler IC3 is read by setting a detection device, and a charging signal is output. In actual applications, by connecting the pin of the photosensitive end of the indoor data receiving optocoupler IC3 to the analog-to-digital conversion pin of the MCU, the charging current size is detected by reading the output level of the indoor data receiving optocoupler IC3, and a charging signal is generated. Specifically, during the charging process of the capacitor component E6, when the power of the capacitor component E6 is about to be full, the charging current in the charging circuit will become smaller, and the voltage detected by the MCU will become smaller. When the voltage is reduced to less than the predetermined threshold voltage, it is considered that the capacitor component E6 is fully charged. At this time, the indoor main control board 100 turns off the indoor data transmission optocoupler IC1, and needs to delay 500ms to communicate with the outdoor main control board 200. Among them, generating a charging signal by reading the current size belongs to the prior art and will not be described in detail here.

[0053] In other embodiments, the air conditioning system further includes a signal amplifying and shaping circuit 150 , and an input end of the signal amplifying and shaping circuit 150 is connected to a photosensing end of an indoor data receiving optocoupler IC3 .

[0054] It can be understood that since the amplitude and frequency of the signal to be tested output by the photosensitive end of the indoor data receiving optocoupler IC3, as well as the type of signal wave are unknown, the signal to be tested must first be amplified and shaped to make it a pulse wave with an amplitude within a certain range, such as 3-5V, so that the indoor main control board 100 can correctly measure and read it.

[0055] In other embodiments, the signal amplification and shaping circuit 150 includes a switch tube Q3 and a second resistor R2, the first switch pin of the switch tube Q3 is connected to a constant voltage source through the second resistor R2, the second switch pin of the switch tube Q3 is grounded, the control pin of the switch tube Q3 is connected to the input end of the signal amplification and shaping circuit 150, and the connection point between the first switch pin of the switch tube Q3 and the second resistor R2 is connected to the output end of the signal amplification and shaping circuit 150.

[0056] It can be understood that the triode is a semiconductor triode, also known as a bipolar transistor or a crystal triode, which is a semiconductor device that controls current. Its function is to amplify weak signals into electrical signals with larger amplitude values, and it is also used as a contactless switch. The triode is one of the basic semiconductor components, has the function of current amplification, and is the core component of electronic circuits. The triode is made of two PN junctions very close to each other on a semiconductor substrate. The two PN junctions divide the entire semiconductor into three parts. The middle part is the base area, and the two sides are the emitter area and the collector area. There are two arrangements: PNP and NPN. In actual applications, the output end of the charging detection module 140 is connected to the switch tube Q3 through R3 to amplify and shape the signal into a digital signal to facilitate normal communication between the indoor main control board 100 and the outdoor main control board 200; then the output end of the signal amplification and shaping circuit 150 is connected through the connection point of the first switch pin of the switch tube Q3 and the second resistor R2, so that the signal amplification and shaping circuit 150 can output a stable signal, thereby improving the communication success rate between the indoor main control board 100 and the outdoor main control board 200.

[0057] In actual application, first, the indoor main control board 100 responds to the outdoor unit wake-up command, controls the light-emitting end of the indoor data sending optocoupler IC1 to make the light-sensitive end of the indoor data sending optocoupler IC1 conductive, so as to form a charging circuit to charge the capacitor component E6 of the first switching power supply 210.

[0058] It is understandable that if Figure 1 As shown, when the air-conditioning system is powered on, the power switch 230 of the outdoor main control board 200 is disconnected, and L2 and N2 do not form a loop. At this time, the outdoor main control board 200 is not powered, and only the indoor main control board 100 is powered by the DC power supply 110. Moreover, the indoor main control board 100 enters the standby state when there is no user operation. Therefore, the air-conditioning system can achieve low-power standby in this state.

[0059] It is understandable that when the indoor environment reaches the startup condition of the outdoor unit, or the user starts the air conditioning system through the indoor remote control device, the indoor main control board 100 responds to the outdoor unit wake-up command, controls the light-emitting end of the indoor data transmission optocoupler IC1 to make the light-sensitive end of the indoor data transmission optocoupler IC1 conductive, and the DC power supply 110 and the reference potential point are connected through the S line of the current loop communication circuit 120 and the charging circuit of the auxiliary wake-up branch 220 to charge the capacitor component E6 of the first switch power supply 210. Figure 2 As shown, the charging circuit can quickly and stably charge the capacitor component E6 to ensure that the outdoor main control board 200 can be powered on and started quickly.

[0060] When it is detected that the charging signal is lower than the preset value, the light-emitting end of the indoor data transmission optocoupler IC1 is controlled to cut off the light-sensitive end of the indoor data transmission optocoupler IC1, and the charging signal is obtained by sampling based on the charging current in the charging circuit.

[0061] It is understandable that during the rapid charging of the capacitor component E6, the indoor main control board 100 also performs real-time detection of the current in the charging circuit through the charging detection module 140. During the charging process, when the power of the capacitor component E6 is about to run low, the charging current in the charging circuit will become smaller, and the voltage detected by the charging detection module 140 will become smaller. When it is detected that the charging signal is lower than the preset value, the indoor main control board 100 controls the light-emitting end of the indoor data transmission optocoupler IC1 so that the light-sensitive end of the indoor data transmission optocoupler IC1 is cut off, the charging circuit is disconnected, and the DC power supply 110 stops charging the capacitor component E6. Figure 3 As shown, the indoor main control board 100 and the outdoor main control board 200 communicate via the current loop communication circuit 120 .

[0062] In other embodiments, the current loop communication circuit 120 further includes a first resistor R1 and an indoor data receiving optocoupler IC3, the light-emitting end of the indoor data receiving optocoupler IC3 is connected in parallel with the first resistor R1, the light-emitting end of the indoor data receiving optocoupler IC3 is connected to the N line of the current loop communication circuit 120 and the photosensitive end of the indoor data sending optocoupler IC1, and the air conditioning system further includes a charging detection module 140, the sampling end of the charging detection module 140 is connected to the photosensitive end of the indoor data receiving optocoupler IC3, and the output end of the charging detection module 140 outputs a charging signal to the indoor main control board 100. It can be understood that the connection relationship between the first resistor R1, the indoor data receiving optocoupler IC3, and the charging detection module 140 is consistent with the connection relationship between the various components in the above-mentioned air conditioning system, and will not be repeated here.

[0063] After a preset delay time, the indoor main control board 100 sends a confirmation instruction to the outdoor main control board 200 through the current loop communication circuit 120 and waits for a confirmation response instruction sent by the outdoor main control board 200.

[0064] It is understandable that in order to ensure that the indoor main control board 100 can communicate with the outdoor main control board 200 through the current loop communication circuit 120, the main control board 100 sends a confirmation command to the outdoor main control board 200 after a preset delay. It is understandable that latency, synonymous with delay, is the time it takes to get a data packet from a specific point. In some cases, the delay time is the time it takes for a packet to be sent out and return to the sending end. The reasons for network transmission delay time include: Transmission, the time it takes for a packet to propagate at the speed of light between two places. Transmission: The medium itself (whether optical fiber, wireless or other medium) causes some delay. The delay caused by large packets is often longer than that caused by small packets. Routers and other processing, each gateway, node takes time to detect that the header of the packet may be changed (for example, the hop count in the time-to-live domain is changed. In this embodiment, the current loop communication circuit 120 is composed of an indoor data transmission optocoupler IC1, an outdoor data reception optocoupler IC2, an indoor data reception optocoupler IC3 and an outdoor data transmission optocoupler IC4. There are fewer nodes in the circuit, and a shorter preset delay time can be set to ensure normal communication.

[0065] In actual application, after a delay of 500ms, the indoor main control board 100 sends a command to the outdoor main control board 200 through the current loop communication circuit 120 to confirm whether the outdoor main control board 200 has been awakened and whether the function is normal. After receiving the reply confirmation character (Acknowledge character, ACK) from the outdoor main control board 200 within 500ms, the entire awakening process is ended.

[0066] If the confirmation response instruction is not received within the response time threshold, the indoor main control board 100 re-controls the light-emitting end of the indoor data transmission optocoupler IC1 to turn on the light-sensitive end of the indoor data transmission optocoupler IC1.

[0067] It is understandable that after the indoor main control board 100 issues a command, if the indoor main control board 100 does not receive a confirmation response command from the outdoor main control board 200 within the preset response time threshold, it is determined that the outdoor main control board 200 fails to wake up due to reasons such as unsuccessful charging of the capacitor component E6. The indoor main control board 100 controls the light-emitting end of the indoor data transmission optocoupler IC1 to turn on the light-sensitive end of the indoor data transmission optocoupler IC1, and then re-executes the above step S1000 to re-wake up the outdoor main control board 200.

[0068] In other embodiments, when the indoor main control board 100 does not receive the confirmation response instruction within the response time threshold, the number of failures is recorded.

[0069] It is understandable that in actual applications, the indoor main control board 100 cannot receive the confirmation response instruction of the outdoor main control board 200 when there is a fault in the air-conditioning system. For example, the outdoor main control board 200 cannot be awakened normally due to damage to the current loop communication circuit 120, the DC power supply 110, the capacitor component E6, etc. In order to avoid the air-conditioning system entering a state of cyclically awakening the outdoor main control board 200 and causing damage to other components, it is necessary to record the number of failures to awaken the outdoor main control board 200. Specifically, in the case where a confirmation response instruction is not received, the number of failures is added by one through an instruction to accurately record the number of failures. It is understandable that recording the number of failures through instructions belongs to the prior art and will not be elaborated here.

[0070] In other embodiments, when the number of failures reaches a preset number, the indoor main control board 100 issues a fault reminder.

[0071] It is understandable that when the number of failures reaches a preset number, for example three times, that is, after the indoor main control board 100 executes the above steps S1000 to S3300 three times in a row, the indoor main control board 100 cannot receive the confirmation response instruction, it is determined that there is a fault in the air-conditioning system that causes the outdoor main control board 200 to be unable to be awakened, and a fault reminder is issued to inform the user to troubleshoot the problem.

[0072] In actual application, the outdoor main control board 200 closes the power switch 230 after being powered on and awakened.

[0073] It is understandable that if Figure 1 As shown, when the air-conditioning system is powered on, the power switch 230 of the outdoor main control board 200 is disconnected, and L2 and N2 do not form a loop. At this time, the outdoor main control board 200 is not powered, and only the indoor main control board 100 is powered by the DC power supply 110. Moreover, the indoor main control board 100 enters the standby state when there is no user operation. Therefore, the air-conditioning system can achieve low-power standby in this state.

[0074] It can be understood that when the indoor main control board 100 responds to the outdoor unit wake-up command, a charging circuit is formed to charge the capacitor component E6 of the first switching power supply 210. Figure 2 As shown, the charging circuit can quickly and stably charge the capacitor component E6 to ensure that the outdoor main control board 200 can be powered on and started quickly. After the capacitor component E6 is recharged, it supplies power to the main control chip 240 of the outdoor main control board 200, so that the main control chip 240 is awakened. Figure 3 As shown, in order to power the load of the outdoor unit, the main control chip 240 controls the power switch 230 to close, so that the first switching power supply 210 is connected to the mains, and supplies power to the load of the outdoor unit through the first rectifier bridge circuit 211 and the first transformer TR1.

[0075] Next, the outdoor main control board 200 controls and turns on the outdoor data receiving optical coupler IC2 of the current loop communication circuit 120 , and waits to receive the confirmation instruction sent by the indoor main control board 100 .

[0076] It is understandable that if Figure 3 As shown, the indoor main control board 100 and the outdoor main control board 200 communicate with each other through the current loop communication circuit 120. Specifically, the outdoor main control board 200 receives the confirmation instruction sent by the indoor main control board 100 by connecting the outdoor data receiving optical coupler IC2.

[0077] When the outdoor main control board 200 receives the confirmation instruction, the outdoor data transmission optocoupler IC4 of the current loop communication circuit 120 sends a confirmation response instruction to the indoor main control board 100.

[0078] It is understandable that after the outdoor main control board 200 receives the confirmation instruction through the outdoor data receiving optocoupler IC2, it needs to respond to the confirmation instruction. Specifically, when the outdoor main control board 200 is awakened normally, that is, the main control chip 240 is powered normally and can operate normally, the outdoor main control board 200 sends a confirmation response instruction to the indoor main control board 100 through the outdoor data sending optocoupler IC4, and waits for the next instruction from the indoor main control board 100. Among them, the outdoor main control board 200 sends a confirmation response instruction to the indoor main control board 100 through the outdoor data sending optocoupler IC4, which belongs to the prior art and will not be described in detail here.

[0079] It can be understood that when the user shuts down the air conditioner, the indoor main control board 100 sends a shutdown command to the outdoor main control board 200 through the current loop communication circuit 120. After receiving the shutdown command, the outdoor main control board 200 controls the power switch 230 to turn off; at the same time, the indoor main control board 100 turns off the indoor data sending optocoupler IC1 to complete the power-off operation, and the air-conditioning system enters a low-energy standby state.

[0080] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components 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 may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media generally include computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

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; An auxiliary wake-up branch, 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; A power 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; The current loop communication circuit includes an indoor data sending optocoupler, and the photosensitive end of the indoor data sending optocoupler is connected to the reference potential point and the N line of the current loop communication circuit; when the power switch is disconnected and the photosensitive end of the indoor data sending optocoupler is turned on, 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 of the current loop communication circuit and the auxiliary wake-up branch, so as to use the voltage across the capacitor component of the first switching power supply to start the outdoor main control board.

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 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.

6. 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.

7. The air conditioning system according to claim 6, 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.

8. The air conditioning system according to claim 1, characterized in that: The current loop communication circuit also includes a first resistor and an indoor data receiving optocoupler, the light-emitting end of the indoor data receiving optocoupler is connected in parallel with the first resistor, and the light-emitting end of the indoor data receiving optocoupler is connected to the N line of the current loop communication circuit and the photosensitive end of the indoor data sending optocoupler.

9. The air conditioning system according to claim 8, characterized in that: The air conditioning system also includes a charging detection module, a sampling end of the charging detection module is connected to the photosensing end of the indoor data receiving optocoupler, and an output end of the charging detection module is used to output a charging signal corresponding to the charging current in the charging circuit.

10. The air conditioning system according to claim 8, characterized in that: The air conditioning system further comprises a signal amplifying and shaping circuit, the input end of which is connected to the photosensitive end of the indoor data receiving optical coupler.

11. The air conditioning system according to claim 10, characterized in that: The signal amplification and shaping circuit includes a switch tube and a second resistor, the first switch pin of the switch tube is connected to a constant voltage source through the second resistor, the second switch pin of the switch tube is grounded, the control pin of the switch tube is connected to the input end of the signal amplification and shaping circuit, and the connection point between the first switch pin of the switch tube and the second resistor is connected to the output end of the signal amplification and shaping circuit.

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