Air conditioner

Abstract

The utility model discloses an air conditioner. The air conditioner comprises first equipment and second equipment, the first equipment comprises a first current loop circuit, a communication power supply circuit and a first control circuit; the second equipment comprises a pre-charging circuit and a second power supply circuit, the pre-charging circuit comprises a main loop and an auxiliary loop, and a second input end of the second power supply circuit is electrically connected with the zero line; in the pre-charging stage, the first control circuit controls the first current loop circuit and the communication power supply circuit so that power can be supplied to the auxiliary loop through the first current loop circuit, the communication power supply circuit, the zero line and the communication line, on-off control can be conducted on the main loop, and an external power source can pre-charge the second power supply circuit through the live line, the main loop and the zero line. Therefore, according to the air conditioner, the electric control size of the first equipment is reduced, meanwhile, no large current exists in the first equipment, and the operation safety is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to an air conditioner. Background Art

[0002] In the prior art, a large relay is installed on the indoor main control board of the air conditioner to control the outdoor unit. However, the large relay in this solution increases the size of the indoor electronic control unit. Furthermore, when powering the outdoor unit, the current from the outdoor unit flows through the indoor main control board, increasing the risk of fire caused by the high current in the indoor electronic control unit. Utility Model Content

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, the present invention provides an air conditioner in which only a communication circuit portion is provided within a first device, while the pre-charging circuit required for the pre-charging process is provided within a second device. This reduces the electronic control volume of the first device, and during the pre-charging process of the second power supply circuit, the charging current is not introduced into the first device, thereby eliminating high current flow within the first device and further improving the safety of the first device.

[0004] To achieve the above-mentioned purpose, an embodiment of the present utility model proposes an air conditioner, comprising: a first device and a second device, one of the first device and the second device is an indoor unit, and the other is an outdoor unit; the first device comprises a first current loop circuit, a communication power supply circuit and a first control circuit, the first current loop circuit is electrically connected to the communication line, and the communication power supply circuit is electrically connected to the first current loop circuit, the live wire and the neutral wire respectively; the second device comprises a pre-charging circuit and a second power supply circuit, the pre-charging circuit comprises a main circuit and an auxiliary circuit, the auxiliary circuit is electrically connected to the neutral wire and the communication line respectively, the main circuit is electrically connected to the live wire and the first input end of the second power supply circuit respectively, and the second input end of the second power supply circuit is electrically connected to the neutral wire; wherein, in the pre-charging stage, the first control circuit controls the first current loop circuit and the communication power supply circuit to supply power to the auxiliary circuit through the first current loop circuit, the communication power supply circuit, the neutral wire and the communication line, so as to control the on-off of the main circuit, so that the external power supply pre-charges the second power supply circuit through the live wire, the main circuit and the neutral wire.

[0005] According to the air conditioner of the present invention, one of the first device and the second device is an indoor unit, and the other is an outdoor unit. The first device includes a first current loop circuit, a communication power supply circuit and a first control circuit. The first current loop circuit is electrically connected to the communication line, and the communication power supply circuit is electrically connected to the first current loop circuit, the live wire and the neutral wire respectively. The second device includes a pre-charging circuit and a second power supply circuit. The pre-charging circuit includes a main circuit and an auxiliary circuit. The auxiliary circuit is electrically connected to the neutral wire and the communication line respectively. The main circuit is electrically connected to the live wire and the first input end of the second power supply circuit respectively, and the second input end of the second power supply circuit is electrically connected to the neutral wire. In the pre-charging stage, the first control circuit controls the first current loop circuit and the communication power supply circuit to supply power to the auxiliary circuit through the first current loop circuit, the communication power supply circuit, the neutral wire and the communication line, so as to perform on-off control on the main circuit so that the external power supply pre-charges the second power supply circuit through the live wire, the main circuit and the neutral wire. Therefore, the air conditioner only has a communication circuit part in the first device, and the pre-charging circuit required for the pre-charging process is set in the second device, reducing the electronic control volume of the first device. At the same time, during the pre-charging process of the second power supply circuit, the charging current will not be introduced into the first device, so that there is no large current in the first device, further improving the safety of the first device.

[0006] In addition, the air conditioner according to the above embodiment of the present invention may also have the following additional technical features:

[0007] Specifically, the second device also includes a second current loop circuit and a second control circuit, and the second current loop circuit is electrically connected to the neutral line and the communication line respectively; wherein, in the pre-charging stage, the second control circuit controls the second current loop circuit to be in a cut-off state.

[0008] Specifically, the second device also includes a power supply switch, which is connected in parallel with the main circuit; wherein, in the working stage after pre-charging is completed, the first control circuit controls the communication power supply circuit to stop supplying power to the auxiliary circuit to disconnect the main circuit; the second control circuit controls the power supply switch to be turned on, so that the external power supply supplies power to the second power supply circuit through the power supply switch, the live wire and the neutral wire, and establishes a current loop path with the first control circuit through the second current loop circuit, the communication line, the first current loop circuit and the neutral wire.

[0009] Specifically, the pre-charging circuit includes a pre-charging switch, a pre-charging resistor, a current-limiting resistor and a third voltage-stabilizing diode; wherein, the main circuit includes a main branch of the pre-charging switch and the pre-charging resistor connected in series, and one end of the series connection is electrically connected to the live wire, and the other end is electrically connected to the first input end of the second power supply circuit; the auxiliary circuit includes an auxiliary branch of the pre-charging switch, a current-limiting resistor and a third voltage-stabilizing diode connected in series, and one end of the series connection is electrically connected to the neutral wire, and the other end is electrically connected to the communication line, and the anode of the third voltage-stabilizing diode is electrically connected to the communication line.

[0010] Specifically, the pre-charge switch is a relay, the main branch includes the switch of the relay, and the auxiliary branch includes the coil of the relay; or, the pre-charge switch is a diode switch circuit, the main branch includes a first receiving diode and a second receiving diode connected in reverse parallel, the auxiliary main branch includes a transmitting diode, and the anode of the transmitting diode is electrically connected to the neutral line, and the cathode of the transmitting diode is electrically connected to the communication line.

[0011] Specifically, the communication power supply circuit includes: an energy storage capacitor, a first voltage-stabilizing diode, a second voltage-stabilizing diode, an expansion switch and a power-taking diode. One end of the energy storage capacitor is electrically connected to the first current loop circuit, the other end of the energy storage capacitor is electrically connected to the neutral line, the cathode of the first voltage-stabilizing diode is electrically connected to the other end of the energy storage capacitor, the anode of the first voltage-stabilizing diode is electrically connected to the cathode of the second voltage-stabilizing diode, the anode of the second voltage-stabilizing diode is electrically connected to one end of the energy storage capacitor, the expansion switch is connected in parallel with the second voltage-stabilizing diode, the anode of the power-taking diode is electrically connected to one end of the energy storage capacitor, and the cathode of the power-taking diode is electrically connected to the live wire; wherein, the voltage regulation value of the first voltage-stabilizing diode is less than the voltage regulation value of the third voltage-stabilizing diode and the sum of the voltage regulation values ​​of the first voltage-stabilizing diode and the second voltage-stabilizing diode; in the pre-charging stage, the first control circuit controls the expansion switch to be disconnected; in the working stage after the pre-charging is completed, the first control circuit controls the expansion switch to be turned on.

[0012] Specifically, the second current loop circuit includes: a second receiving optocoupler, a second transmitting optocoupler, a second resistor, a second diode and a second transmitting switch, the first end of the second receiving optocoupler is electrically connected to the neutral line, the second end of the second receiving optocoupler is electrically connected to the third end of the second transmitting optocoupler, the third end of the second receiving optocoupler is electrically connected to the second preset power supply, the fourth end of the second receiving optocoupler is electrically connected to the second control circuit, the first end of the second transmitting optocoupler is electrically connected to the second preset power supply, the second end of the second transmitting optocoupler is electrically connected to the second control circuit through the second transmitting switch, the fourth end of the second transmitting optocoupler is electrically connected to the anode of the second diode through the second resistor, and the cathode of the second diode is electrically connected to the communication line; wherein, one end of the auxiliary loop is electrically connected to the first end of the second receiving optocoupler or the second end of the second receiving optocoupler, and the other end of the auxiliary loop is electrically connected to the fourth end of the second transmitting optocoupler, the anode of the second diode or the cathode of the second diode; in the pre-charging stage, the second control circuit controls the second transmitting optocoupler to be in the cut-off state so that the second current loop circuit is in the cut-off state.

[0013] Specifically, the first current loop circuit includes: a first receiving optocoupler, a first transmitting optocoupler, a first resistor, a first diode and a first transmitting switch, the first end of the first receiving optocoupler is electrically connected to the cathode of the first diode through the first resistor, the anode of the first diode is electrically connected to the communication line, the second end of the first receiving optocoupler is electrically connected to the third end of the first transmitting optocoupler, the third end of the first receiving optocoupler is electrically connected to the first preset power supply, the fourth end of the first receiving optocoupler is electrically connected to the first control circuit, the first end of the first transmitting optocoupler is electrically connected to the first preset power supply, the second end of the first transmitting optocoupler is electrically connected to the first control circuit through the first transmitting switch, and the fourth end of the first transmitting optocoupler is electrically connected to the communication power supply circuit; wherein, in the pre-charging stage, the first control circuit controls the on-off of the first transmitting switch according to the preset frequency and preset duty cycle to control the first current loop circuit.

[0014] Specifically, the first device further includes a first power supply circuit electrically connected to the live wire and the neutral wire, and configured to supply power to the first device.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the connection of an air conditioner according to an embodiment of the present invention Figure 1 ;

[0017] Figure 2 A schematic diagram of the connection of an air conditioner according to an embodiment of the present invention Figure 2 ;

[0018] Figure 3 A schematic diagram of the connection of an air conditioner according to an embodiment of the present invention Figure 3 ;

[0019] Figure 4 is a circuit diagram of an air conditioner according to a specific embodiment of the utility model;

[0020] Figure 5 is a circuit diagram of an air conditioner according to another specific embodiment of the utility model;

[0021] Figure 6 is a timing diagram of an air conditioner according to a specific embodiment of the utility model;

[0022] Figure 7 1 is a schematic diagram of an execution flow of a first control circuit according to a specific embodiment of the present utility model;

[0023] Figure 82 is a schematic diagram of an execution flow of a second control circuit according to a specific embodiment of the present utility model. DETAILED DESCRIPTION

[0024] The following describes in detail embodiments of the present invention, examples of which 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 intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] The air conditioner proposed by the present invention will be described below with reference to the accompanying drawings.

[0026] Figure 1 1 is a connection diagram of an air conditioner according to an embodiment of the present utility model.

[0027] like Figure 1 As shown, the air conditioner 1000 of the embodiment of the present invention includes: a first device 10 and a second device 20, one of the first device 10 and the second device 20 is an indoor unit and the other is an outdoor unit; the first device 10 includes a first current loop circuit 11, a communication power supply circuit 12 and a first control circuit 13, the first current loop circuit 11 is electrically connected to the communication line S, and the communication power supply circuit 12 is electrically connected to the first current loop circuit 11, the live line L and the neutral line N respectively; the second device 20 includes a pre-charging circuit 21 and a second power supply circuit 22, the pre-charging circuit 21 includes a main circuit 211 and an auxiliary circuit 212, the auxiliary circuit 212 are electrically connected to the neutral line N and the communication line S respectively, the main circuit 211 is electrically connected to the live line L and the first input end of the second power supply circuit 22 respectively, and the second input end of the second power supply circuit 22 is electrically connected to the neutral line N; wherein, in the pre-charging stage, the first control circuit 13 controls the first current loop circuit 11 and the communication power supply circuit 12 to supply power to the auxiliary circuit 212 through the first current loop circuit 11, the communication power supply circuit 12, the neutral line N and the communication line S, so as to control the on-off of the main circuit 211, so that the external power supply pre-charges the second power supply circuit 22 through the live line L, the main circuit 211 and the neutral line N.

[0028] Specifically, one of the first device 10 and the second device 20 is an indoor unit, and the other is an outdoor unit. The air conditioner 1000 of the present application is described in detail below by taking the first device 10 as an indoor unit and the second device 20 as an outdoor unit as an example.

[0029] After the air conditioner 1000 is powered on, the first control circuit 13 is powered on and started, the communication power supply circuit 12 draws power from the power line, and converts the electrical signal provided by the external power supply into an output communication voltage, which is used to power the current loop during normal communication and to power the auxiliary circuit 212 during the pre-charging process.

[0030] When a cooling or heating command is received, the outdoor unit needs to be powered on and the pre-charging phase begins. During the pre-charging phase, when the first control circuit 13 controls the first current loop circuit 11 to be conductive, the first current loop circuit 11, the communication power supply circuit 12, and the auxiliary circuit 212 form a power supply circuit via the neutral line N and the communication line S. The auxiliary circuit 212 is powered based on the communication voltage output by the communication power supply circuit 12. After the auxiliary circuit 212 is powered, the main circuit 211 is conductive, and the external power supply pre-charges the second power supply circuit 22 via the live line L, the main circuit 211, and the neutral line N. When the first control circuit 13 controls the first current loop circuit 11 to be disconnected, the power supply circuit between the first current loop circuit 11, the communication power supply circuit 12, and the auxiliary circuit 212 is disconnected, cutting off power to the auxiliary circuit 212. At this point, the main circuit 211 is disconnected, and pre-charging of the second power supply circuit 22 ceases. Thus, the first control circuit 13 controls the conductive or disconnected main circuit 21 by controlling the first current loop circuit 11, thereby controlling the start or stop of pre-charging of the second power supply circuit 22.

[0031] It is understandable that, during the pre-charging process, the first control circuit 13 can determine the control signal based on the target pre-charging power to control the first current loop circuit 11 and / or the communication power supply circuit 12. For example, during the pre-charging process, the first control circuit 13 can control the on or off of the first current loop circuit 11 by outputting a control signal, and control whether the communication power supply circuit 12 supplies power or the output voltage, etc. Assuming that during the pre-charging process, the communication power supply circuit 12 is always in the target working state, and the first control circuit 13 controls the on or off of the first current loop circuit 11 through a control signal, then the controller signal can use a PWM signal with a frequency of f1 and a duty cycle not equal to 1. Then, during the pre-charging process, the on or off of the first current loop circuit 11 is controlled in a pulse form, thereby controlling the on or off of the main circuit 211, and realizing on-off control of the pre-charging. The controller signal can also be a control signal with a duty cycle of 1. Then, during the pre-charging process, the first current loop circuit 11 is controlled to be in the on state based on the control signal, and the external power supply continuously pre-charges the second power supply circuit 22 through the main loop 211.

[0032] A control component capable of achieving linkage is provided between the auxiliary circuit 212 and the main circuit 211, so that when power is supplied to the auxiliary circuit 212, the main circuit 211 is turned on, and when power is stopped, the main circuit 211 is turned off. For example, a relay is provided between the auxiliary circuit 212 and the main circuit 211, the control coil of the relay is provided in the auxiliary circuit 212, the main contacts of the relay are connected in series in the main circuit 211, and when the control coil is energized, the main contacts are closed, thereby controlling the conduction of the main circuit 211; or a switch tube is provided in the main circuit 211, the control terminal of the switch tube is provided in the auxiliary circuit 212, and when power is supplied to the auxiliary circuit 212, the control terminal of the switch tube is at a high level, the switch tube is turned on, and the main circuit 211 is turned on.

[0033] This embodiment only has a communication circuit and a communication power supply circuit in the indoor unit, and the pre-charging circuit 21 required for powering the outdoor unit is set in the outdoor unit. Therefore, there is no need to set a large relay on the indoor unit electronic control board, so that the size of the indoor unit electronic control board is reduced. At the same time, the communication line S is only used for communication and will not be reused as a power line. During the pre-charging process, the external power supply directly pre-charges the second power supply circuit 22 based on the power line interface of the outdoor unit and the main loop 211, so that the charging current will not flow into the indoor unit, and the indoor unit will not introduce large current, which greatly reduces the fire risk of the indoor unit.

[0034] Combine Figure 2 As shown, in one embodiment of the present invention, the second device 20 also includes a second current loop circuit 23 and a second control circuit 24, and the second current loop circuit 23 is electrically connected to the neutral line N and the communication line S respectively; wherein, in the pre-charging stage, the second control circuit 24 controls the second current loop circuit 23 to be in a cut-off state.

[0035] Specifically, during the pre-charging process, the output voltage of the second power supply circuit 22 gradually increases. After the output voltage of the second power supply circuit 22 reaches the preset operating voltage, the second control circuit 24 is powered on and started, and controls the second current loop circuit 23 to be in the cut-off state, and continues to supply power to the auxiliary circuit 212 through the first current loop circuit 11, the communication power supply circuit 12, the neutral line N and the communication line S to pre-charge the second power supply circuit 22.

[0036] Combine Figure 3As shown, in one embodiment of the present invention, the second device 20 also includes a power supply switch K2, which is connected in parallel with the main circuit 211; wherein, in the working stage after pre-charging is completed, the first control circuit 13 controls the communication power supply circuit 12 to stop supplying power to the auxiliary circuit 212, so that the main circuit 211 is disconnected; the second control circuit 24 controls the power supply switch K2 to be turned on, so that the external power supply supplies power to the second power supply circuit 22 through the power supply switch K2, the live wire L and the neutral wire N, and establishes a current loop path with the first control circuit 13 through the second current loop circuit 23, the communication line S, the first current loop circuit 11 and the neutral wire N.

[0037] Specifically, during the pre-charging stage, the power supply switch K2 is in the off state, and the external power supply pre-charges the second power supply circuit 22 through the main circuit 211. When it is determined that the pre-charging time has reached the preset duration, the first control circuit 13 determines that the pre-charging is complete, controls the communication power supply circuit 12 to stop supplying power to the auxiliary circuit 212, and disconnects the main circuit 211. At the same time, the second control circuit 14 obtains the output voltage of the second power supply circuit 22 during the pre-charging process, determines that the pre-charging is complete when the output voltage reaches the charging threshold, and controls the power supply switch K2 to turn on. At this time, the external power supply directly supplies power to the second power supply circuit 22 through the power supply switch K2. The current loop path between the outdoor unit and the indoor unit is successfully established, and the normal working stage is entered.

[0038] The power switch K2 may be a relay, and the second control circuit 14 controls the closing and opening of the power switch K2 through a driving circuit. The default state of the power switch K2 is the open state.

[0039] As a result, the indoor unit only has a communication circuit part, and there is no other switching circuit for pre-charging and normal power supply of the outdoor unit. Therefore, there is no need to set a large relay in the indoor unit, which reduces the size of the indoor unit's electronic control board. At the same time, it can ensure that the pre-charging current and operating current of the outdoor unit will not flow through the indoor unit, nor will they pass through the communication line S, so that no large current is introduced into the indoor unit, which greatly reduces the fire risk of the indoor unit and improves the safety of the indoor unit.

[0040] Combine Figure 4 and Figure 5As shown, in one embodiment of the present invention, the pre-charging circuit 21 includes a pre-charging switch K1, a pre-charging resistor R3, a current-limiting resistor R4 and a third voltage-stabilizing diode ZV3; wherein, the main circuit 211 includes a main branch of the pre-charging switch K1 and the pre-charging resistor R3 connected in series, and one end of the series connection is electrically connected to the live wire L, and the other end is electrically connected to the first input end of the second power supply circuit 22; the auxiliary circuit 212 includes an auxiliary branch of the pre-charging switch K1, a current-limiting resistor R4 and a third voltage-stabilizing diode ZV3 connected in series, and one end of the series connection is electrically connected to the neutral wire N, and the other end is electrically connected to the communication line S, and the anode of the third voltage-stabilizing diode ZV3 is electrically connected to the communication line S.

[0041] Specifically, the pre-charging resistor R3 may be a PTC (Positive Temperature Coefficient) resistor to prevent the second power supply circuit 22 from being damaged by an excessive charging current.

[0042] During the pre-charging process, when the first control circuit 13 controls the first current loop circuit 11 and the communication power supply circuit 12 to supply power to the auxiliary circuit 212 through the first current loop circuit 11, the communication power supply circuit 12, the neutral line N, and the communication line S, the auxiliary branch of the pre-charging switch K1 is powered on, causing the main branch of the pre-charging switch K1 to be conductive, and the first input end of the second power supply circuit 22 is connected to the live wire L based on the conductive main branch of the pre-charging switch K1 and the pre-charging resistor R3, and the external power supply pre-charges the second power supply circuit 22 through the main circuit 211. When the first control circuit 13 controls the first current loop circuit 11 and the communication power supply circuit 12 to stop supplying power to the auxiliary circuit 212, no current flows through the auxiliary branch of the pre-charging switch K1, causing the main branch of the pre-charging switch K1 to be disconnected, the external power supply stops supplying power to the second power supply circuit 22, and pre-charging stops.

[0043] In one embodiment of the present invention, the pre-charge switch K1 is a relay, the main branch includes the switch of the relay, and the auxiliary branch includes the coil of the relay; or, the pre-charge switch K1 is a diode switch circuit, the main branch includes a first receiving diode and a second receiving diode connected in reverse parallel, the auxiliary main branch includes a transmitting diode, and the anode of the transmitting diode is electrically connected to the neutral line N, and the cathode of the transmitting diode is electrically connected to the communication line S.

[0044] Specifically, in Figure 4In the embodiment shown, when the first control circuit 13 controls the first current loop circuit 11 and the communication power supply circuit 12 to supply power to the auxiliary circuit 212 through the first current loop circuit 11, the communication power supply circuit 12, the neutral line N and the communication line S, the coil of the relay is energized and the switch of the relay K1 is closed, thereby turning on the main branch of the pre-charge switch K1 and the main circuit 211; when the first control circuit 13 controls the first current loop circuit 11 and the communication power supply circuit 12 to stop supplying power to the auxiliary circuit 212, the coil of the relay loses power and the switch of the relay K1 is disconnected, thereby disconnecting the main branch of the pre-charge switch K1 and the main circuit 211.

[0045] exist Figure 5 In the embodiment shown, when the first control circuit 13 controls the first current loop circuit 11 and the communication power supply circuit 12 to supply power to the auxiliary circuit 212 through the first current loop circuit 11, the communication power supply circuit 12, the neutral line N and the communication line S, the emitting diode is energized, the main branch is turned on, and the main circuit 211 is turned on; when the first control circuit 13 controls the first current loop circuit 11 and the communication power supply circuit 12 to stop supplying power to the auxiliary circuit 212, the emitting diode loses power, the main branch is disconnected, and the main circuit 211 is disconnected.

[0046] In one embodiment of the present utility model, the communication power supply circuit 12 includes: an energy storage capacitor C1, a first voltage regulator tube ZV1, a second voltage regulator tube ZV2, an expansion switch IC5 and a power-taking diode D3, one end of the energy storage capacitor C1 is electrically connected to the first current loop circuit 11, the other end of the energy storage capacitor C1 is electrically connected to the neutral line N, the cathode of the first voltage regulator tube ZV1 is electrically connected to the other end of the energy storage capacitor C1, the anode of the first voltage regulator tube ZV1 is electrically connected to the cathode of the second voltage regulator tube ZV2, the anode of the second voltage regulator tube ZV2 is electrically connected to one end of the energy storage capacitor C1, the expansion switch IC5 is connected in parallel with the second voltage regulator tube ZV2, the anode of the power-taking diode D3 is electrically connected to one end of the energy storage capacitor C2, and the cathode of the power-taking diode D3 is electrically connected to the live wire L; wherein, the voltage stabilization value V of the first voltage regulator tube ZV1 is zv1 <The voltage value of the third voltage regulator ZV3 V zv3 <The sum of the voltage values ​​of the first voltage regulator tube ZV1 and the second voltage regulator tube ZV2 (V zv1 +V zv2 ); in the pre-charging stage, the first control circuit 13 controls the expansion switch IC5 to be disconnected; in the working stage after the pre-charging is completed, the first control circuit 13 controls the expansion switch IC5 to be turned on.

[0047] Specifically, the external power supply is used to provide alternating current. In the negative half cycle of the alternating current, the power diode D3 is turned on, and the energy storage capacitor C1 is charged by the alternating current, while supplying power to the current loop circuit. In the negative half cycle of the alternating current, the power diode D3 is turned off, and the energy storage capacitor C1 is discharged, continuing to supply power to the current loop circuit.

[0048] The voltage regulation values ​​of the first voltage regulator tube ZV1, the second voltage regulator tube ZV2, and the third voltage regulator tube ZV3 satisfy the following relationship:

[0049] V zV1 <V ZV3 <(V ZV1 +V ZV2 )

[0050] For example, V ZV1 =24V, V zV2 =24V, V ZV3 =33V.

[0051] In the pre-charging stage, the first control circuit 13 outputs a low-level Ctrl_2 signal to control the expansion switch IC5 to be disconnected, and the second voltage regulator ZV2 is in the working state. At this time, the voltage V C2 =(V ZV1 +V ZV2 ) is greater than V ZV3 , therefore, the auxiliary circuit 212 is turned on. In the working stage after the pre-charging is completed, the first control circuit 13 outputs a high-level Ctrl_2 signal to control the expansion switch IC5 to turn on, and the second voltage regulator tube ZV2 is short-circuited. At this time, the voltage V C2 =V zv1 Less than V zv3 , the auxiliary loop 212 is cut off, and the second control circuit 24 establishes a current loop path with the first current loop circuit 11 and the first control circuit 13 through the second current loop circuit 23, the communication line S, and the neutral line N to communicate.

[0052] In one embodiment of the present invention, the second current loop circuit 23 includes: a second receiving optocoupler IC3, a second transmitting optocoupler IC4, a second resistor R2, a second diode D2 and a second transmitting switch Q2, a first end of the second receiving optocoupler IC3 is electrically connected to the neutral line N, a second end of the second receiving optocoupler IC3 is electrically connected to the third end of the second transmitting optocoupler IC4, a third end of the second receiving optocoupler IC3 is electrically connected to the second preset power supply Vcc-B, a fourth end of the second receiving optocoupler IC3 is electrically connected to the second control circuit 24, a first end of the second transmitting optocoupler IC4 is electrically connected to the second preset power supply Vcc-B, and a second end of the second transmitting optocoupler IC4 is electrically connected to the second preset power supply Vcc-B. The second transmitting switch Q2 is electrically connected to the second control circuit 24, the fourth end of the second transmitting optocoupler IC4 is electrically connected to the anode of the second diode D2 through the second resistor R2, and the cathode of the second diode D2 is electrically connected to the communication line S; wherein, one end of the auxiliary loop 212 is electrically connected to the first end of the second receiving optocoupler IC3 or the second end of the second receiving optocoupler IC3, and the other end of the auxiliary loop 212 is electrically connected to the fourth end of the second transmitting optocoupler IC4, the anode of the second diode D2 or the cathode of the second diode D2; in the pre-charging stage, the second control circuit 24 controls the second transmitting optocoupler IC4 to be in the cut-off state, so that the second current loop circuit 23 is in the cut-off state.

[0053] Specifically, in the pre-charging stage, the signal sending pin TXD2 of the second control circuit 24 outputs a low-level signal, controls the second sending switch Q2 to be disconnected, the second sending optocoupler IC4 to be cut off, and the second current loop circuit 23 to be in the cut-off state, so that the pre-charging of the second power supply circuit 22 proceeds normally.

[0054] After the pre-charging is completed, the pre-charging circuit 21 is disconnected, and the external power supply supplies power to the second power supply circuit 22 through the power switch K2. A current loop is successfully established between the second control circuit 24 and the first control circuit 13 to achieve communication between the indoor unit and the outdoor unit.

[0055] When the indoor unit is transmitting and the outdoor unit is receiving, the signal transmission pin TXD2 of the second control circuit 24 outputs a high-level signal to control the second transmission switch Q2 to be conductive, the second transmission optocoupler IC4 to be in the conductive state, and the second receiving optocoupler IC3 to receive the indoor unit's transmission signal. For example, if the first control circuit 13 sends a high level through the first current loop circuit 11, and the control current loop path is conductive, the second receiving optocoupler IC3 is conductive, and the signal receiving pin RXD2 of the second control circuit 24 receives a high level. If the first control circuit 13 sends a low level through the first current loop circuit 11, and the control current loop path is disconnected, the second receiving optocoupler IC3 is turned off, and the signal receiving pin RXD2 of the second control circuit 24 receives a low level.

[0056] When in the communication stage of outdoor unit sending and indoor unit receiving, if the second control circuit 24 outputs a low-level signal through the signal sending pin TXD2, the second sending switch Q2 is disconnected, the second sending optocoupler IC4 is cut off, and the current loop path is disconnected; if the second control circuit 24 outputs a high-level signal through the signal sending pin TXD2, the second sending switch Q2 is turned on, the second sending optocoupler IC4 is turned on, and the current loop path is in the on state.

[0057] In this embodiment, the second resistor R2 is used to limit the current, the second diode D2 is used to limit the current direction in the current loop path, and the second current loop circuit 23 is established based on the optocoupler, thereby achieving the effect of electrical isolation.

[0058] In one embodiment of the present utility model, the first current loop circuit 11 includes: a first receiving optocoupler IC1, a first transmitting optocoupler IC2, a first resistor R1, a first diode D1 and a first transmitting switch Q1, the first end of the first receiving optocoupler IC1 is electrically connected to the cathode of the first diode D1 through the first resistor R1, the anode of the first diode D1 is electrically connected to the communication line S, the second end of the first receiving optocoupler IC1 is electrically connected to the third end of the first transmitting optocoupler IC2, the third end of the first receiving optocoupler IC1 is connected to the first preset power supply Vcc-A, the fourth end of the first receiving optocoupler IC1 is electrically connected to the first control circuit 13, the first end of the first transmitting optocoupler IC2 is electrically connected to the first preset power supply Vcc-A, the second end of the first transmitting optocoupler IC2 is electrically connected to the first control circuit 13 through the first transmitting switch Q1, and the fourth end of the first transmitting optocoupler IC2 is electrically connected to the communication power supply circuit 12;

[0059] In the pre-charging stage, the first control circuit 13 controls the on-off of the first transmitting switch Q1 according to a preset frequency and a preset duty cycle, so as to control the first current loop circuit 11 .

[0060] Specifically, during the pre-charging phase, the first control circuit 13 controls the on-off operation of the first transmitting switch Q1 according to a preset frequency and a preset duty cycle to control the on-off operation of the first current loop circuit 11, thereby controlling the on-off operation of the pre-charging circuit 21 and pre-charging the second power supply circuit 22. The preset frequency and the preset duty cycle can be set based on the target charging power and are not limited thereto.

[0061] After pre-charging is complete, the first control circuit 13 controls the communication power supply circuit 12 to stop supplying power to the auxiliary circuit 212, thereby disconnecting the main circuit 211. A current loop is successfully established between the first control circuit 13 and the second control circuit 24, enabling communication between the indoor and outdoor units.

[0062] When the outdoor unit is transmitting and the indoor unit is receiving, the signal transmission pin TXD1 of the first control circuit 13 outputs a high-level signal to control the first transmission switch Q1 to be turned on, the first transmission optocoupler IC2 to be in the on state, and the signal transmitted by the outdoor unit is received through the first receiving optocoupler IC1. For example, when the second control circuit 24 sends a high level through the second current loop circuit 23 to control the current loop path to be turned on, the first receiving optocoupler IC1 is turned on, and the signal receiving pin RXD1 of the first control circuit 13 receives a high level; when the second control circuit 24 sends a low level through the second current loop circuit 23 to control the current loop path to be turned off, the first receiving optocoupler IC1 is turned off, and the signal receiving pin RXD1 of the first control circuit 13 receives a low level.

[0063] When in the communication stage of indoor unit sending and outdoor unit receiving, if the first control circuit 13 outputs a low-level signal through the signal sending pin TXD1, the first sending switch Q1 is disconnected, the first sending optocoupler IC2 is cut off, and the current loop is disconnected; if the first control circuit 13 outputs a high-level signal through the signal sending pin TXD1, the first sending switch Q1 is turned on, the first sending optocoupler IC2 is turned on, and the current loop is in a conductive state.

[0064] In this embodiment, the first resistor R1 is used to limit the current, the first diode D1 is used to limit the current direction in the current loop path, and the first current loop circuit 11 is established based on the optocoupler, thereby achieving an electrical isolation effect.

[0065] In one embodiment of the present invention, the first device 10 further includes a first power supply circuit 14 electrically connected to the live wire L and the neutral wire N, for supplying power to the first device 10 .

[0066] That is to say, when an external power supply supplies power to the air conditioner, the AC power provided by the external power supply is input into the power line, the first power supply circuit 14 draws power from the power line, and converts the AC power provided by the external power supply into the target DC power to power the indoor unit, thereby powering on the indoor unit.

[0067] As a specific embodiment of the present invention, the air conditioner 1000 is as follows Figure 5 As shown in the timing diagram, Figure 6 As shown, TXD1 and TXD2 represent the control signal status, and also represent the conduction state of the transmitting optocoupler; RCD1 / RXD2 represent the port level status, and also represent the conduction state of the receiving optocoupler; Ctrl_2 represents the control signal status, and also represents the conduction state of the expansion switch IC5; K1 represents the conduction state of the pre-charge switch; K2 represents the conduction state of the power supply switch K2; V-E2 represents the output voltage of the second power supply circuit.

[0068] t0-t1 is the power-on standby stage.

[0069] The first control circuit 13 is powered, and the indoor unit main control and display device are powered and operational. Simultaneously, the communication power supply circuit 12 is powered, establishing a communication voltage. The first control circuit 13 outputs a low-level Ctrl_2 signal to control the expansion switch IC5 to a low-level cutoff state.

[0070] t1-t2 is the pre-charging stage.

[0071] The user turns on the heating / cooling function through the remote control, and the first control circuit 13 controls the conduction of the first transmitting optical coupler IC2 through the TXD1 port with the frequency f1 and the duty cycle D1 to pre-charge the second power supply circuit 22. C2 =(V ZV1 +V ZV2 ) is greater than V ZV3 , so K1 can follow TXD1 to turn on at frequency f1 and duty cycle D1.

[0072] At the beginning of pre-charging, the second control circuit 24 is not powered on. As V-E2 gradually increases and reaches the operating voltage, the second control circuit 24 is powered on and controls the optocoupler IC4 to be cut off until the pre-charging is completed.

[0073] t2-t3 is the normal operation stage.

[0074] When V-E2 is charged to the set value Ve, the second control circuit 24 controls the power supply switch K2 to turn on, and the external power supply continues to charge / supply the outdoor area through the power line. At the same time, when the first control circuit 13 determines that the pre-charging time has reached the preset time, it controls TXD to output a low level and outputs a high level Ctrl_2 signal, controls the switch IC5 to turn on, and short-circuits the second voltage regulator ZV2. Because the communication voltage V output by the communication power supply circuit 12 is C2 =V ZV1 Less than V ZV3 , the pre-charging circuit 21 is cut off, and current loop communication is established between the indoor unit and the outdoor unit.

[0075] The indoor and outdoor units operate normally according to the remote control instructions.

[0076] t3-t5 is the shutdown standby stage.

[0077] t3-t4: The remote controller is turned off and all loads on the outdoor unit stop working.

[0078] t4-t5: TXD1 outputs a low level, disconnecting the current loop. TXD2 outputs a low level, acting as a bypass for K1 and needs to be disconnected. K2 is disconnected, stopping power supply to the outdoor area.

[0079] Ctrl_2 is at a low level, and the switch IC5 is in the cut-off state. The energy storage capacitor E2 begins to discharge gradually, and the air conditioner enters the standby state.

[0080] As a specific embodiment of this application, Figure 7 As shown, the first control circuit can perform the following steps:

[0081] S101, the first control circuit is powered on and started.

[0082] S102, outputs a low-level Ctrl_2 signal.

[0083] S103: Determine whether a target operating instruction has been received. If so, execute step S104; if not, execute step S111. The target operating instruction may be a cooling instruction or a heating instruction.

[0084] S104 , outputting a control signal with a frequency of f1 and a duty cycle of D1 through TXD1 to control the on and off of the optocoupler IC2 , thereby pre-charging the second power supply circuit.

[0085] S105: Determine whether the pre-charging time has reached the preset charging time. If so, proceed to step S106; if not, proceed to step S104.

[0086] S106 , determining that pre-charging is completed, outputting a low-level signal through TXD1 and outputting a high-level Ctrl_2 signal.

[0087] S107: The indoor unit establishes normal communication with the outdoor unit and executes the target working instruction.

[0088] S108, determining whether a shutdown instruction has been received. If so, executing step S109; if not, executing step S107.

[0089] S109, output a low level signal through TXD1 to disconnect the current loop.

[0090] S110 outputs a low-level Ctrl_2 signal.

[0091] S111, enter standby state.

[0092] As a specific embodiment of this application, Figure 8 As shown, the second control circuit can perform the following steps after power-on:

[0093] S201, obtaining the output voltage V-E2 of the second power supply circuit.

[0094] S202, determine whether the output voltage reaches a preset voltage threshold. If yes, execute step S203; if no, execute step S201.

[0095] S203, controlling the power supply switch K2 to be turned on.

[0096] S204: The indoor unit establishes normal communication with the outdoor unit and executes the target working instruction.

[0097] S205: Determine whether a shutdown command has been received. If yes, execute step S206; if no, execute step S204.

[0098] S206, controlling the load to stop working.

[0099] S207 outputs a low level through TXD2 to control the optocoupler IC4 to cut off.

[0100] S208: Control the power switch K2 to be turned off to stop supplying power to the outdoor unit.

[0101] S209: After the energy storage capacitor E2 is discharged, the system enters a standby state.

[0102] In summary, according to the air conditioner of the present invention, one of the first device and the second device is an indoor unit, and the other is an outdoor unit. The first device includes a first current loop circuit, a communication power supply circuit and a first control circuit. The first current loop circuit is electrically connected to the communication line, and the communication power supply circuit is electrically connected to the first current loop circuit, the live wire and the neutral wire respectively. The second device includes a pre-charging circuit and a second power supply circuit. The pre-charging circuit includes a main circuit and an auxiliary circuit. The auxiliary circuit is electrically connected to the neutral wire and the communication line respectively. The main circuit is electrically connected to the live wire and the first input end of the second power supply circuit respectively, and the second input end of the second power supply circuit is electrically connected to the neutral wire. In the pre-charging stage, the first control circuit controls the first current loop circuit and the communication power supply circuit to supply power to the auxiliary circuit through the first current loop circuit, the communication power supply circuit, the neutral wire and the communication line, so as to control the on and off of the main circuit so that the external power supply pre-charges the second power supply circuit through the live wire, the main circuit and the neutral wire. Therefore, the air conditioner only has a communication circuit part in the first device, and the pre-charging circuit required for the pre-charging process is set in the second device, reducing the electronic control volume of the first device. At the same time, during the pre-charging process of the second power supply circuit, the charging current will not be introduced into the first device, so that there is no large current in the first device, further improving the safety of the first device.

[0103] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0104] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0105] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0106] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An air conditioner, characterized in that: include: a first device and a second device, wherein one of the first device and the second device is an indoor unit and the other is an outdoor unit; The first device includes a first current loop circuit, a communication power supply circuit and a first control circuit, the first current loop circuit is electrically connected to the communication line, and the communication power supply circuit is electrically connected to the first current loop circuit, the live line and the neutral line respectively; The second device includes a pre-charging circuit and a second power supply circuit, the pre-charging circuit includes a main circuit and an auxiliary circuit, the auxiliary circuit is electrically connected to the neutral line and the communication line respectively, the main circuit is electrically connected to the live line and the first input end of the second power supply circuit respectively, and the second input end of the second power supply circuit is electrically connected to the neutral line; wherein, In the pre-charging stage, the first control circuit controls the first current loop circuit and the communication power supply circuit to power the auxiliary circuit through the first current loop circuit, the communication power supply circuit, the neutral line and the communication line, so as to control the on-off of the main circuit so that the external power supply pre-charges the second power supply circuit through the live wire, the main circuit and the neutral line.

2. The air conditioner according to claim 1, characterized in that The second device also includes a second current loop circuit and a second control circuit, and the second current loop circuit is electrically connected to the neutral line and the communication line respectively; wherein, in the pre-charging stage, the second control circuit controls the second current loop circuit to be in a cut-off state.

3. The air conditioner according to claim 2, characterized in that The second device also includes a power supply switch, which is connected in parallel with the main circuit; wherein, in the working stage after pre-charging is completed, the first control circuit controls the communication power supply circuit to stop supplying power to the auxiliary circuit to disconnect the main circuit; the second control circuit controls the power supply switch to be turned on, so that the external power supply supplies power to the second power supply circuit through the power supply switch, the live wire and the neutral wire, and establishes a current loop path with the first control circuit through the second current loop circuit, the communication line, the first current loop circuit and the neutral wire.

4. The air conditioner according to claim 3, characterized in that The pre-charging circuit includes a pre-charging switch, a pre-charging resistor, a current-limiting resistor, and a third voltage-stabilizing diode; wherein the main circuit includes a main branch of the pre-charging switch and the pre-charging resistor connected in series, and one end of the series connection is electrically connected to the live wire, and the other end is electrically connected to the first input end of the second power supply circuit; The auxiliary circuit includes an auxiliary branch of the pre-charge switch, the current limiting resistor and the third voltage-stabilizing diode connected in series, and one end of the series connection is electrically connected to the neutral line, the other end is electrically connected to the communication line, and the anode of the third voltage-stabilizing diode is electrically connected to the communication line.

5. The air conditioner according to claim 4, characterized in that The pre-charge switch is a relay, the main branch includes the switch of the relay, and the auxiliary branch includes the coil of the relay; Alternatively, the pre-charge switch is a diode switch circuit, the main branch includes a first receiving diode and a second receiving diode connected in reverse parallel, the auxiliary branch includes a transmitting diode, and the anode of the transmitting diode is electrically connected to the neutral line, and the cathode of the transmitting diode is electrically connected to the communication line.

6. The air conditioner according to claim 4, characterized in that The communication power supply circuit includes: an energy storage capacitor, a first voltage-stabilizing diode, a second voltage-stabilizing diode, an expansion switch and a power-taking diode, one end of the energy storage capacitor is electrically connected to the first current loop circuit, the other end of the energy storage capacitor is electrically connected to the neutral line, the cathode of the first voltage-stabilizing diode is electrically connected to the other end of the energy storage capacitor, the anode of the first voltage-stabilizing diode is electrically connected to the cathode of the second voltage-stabilizing diode, the anode of the second voltage-stabilizing diode is electrically connected to one end of the energy storage capacitor, the expansion switch is connected in parallel with the second voltage-stabilizing diode, the anode of the power-taking diode is electrically connected to one end of the energy storage capacitor, and the cathode of the power-taking diode is electrically connected to the live wire; wherein, the voltage regulation value of the first voltage-stabilizing diode is less than the voltage regulation value of the third voltage-stabilizing diode and the sum of the voltage regulation values ​​of the first voltage-stabilizing diode and the second voltage-stabilizing diode; In the pre-charging stage, the first control circuit controls the capacity expansion switch to be turned off; in the working stage after the pre-charging is completed, the first control circuit controls the capacity expansion switch to be turned on.

7. The air conditioner according to claim 2, characterized in that The second current loop circuit includes: a second receiving optocoupler, a second transmitting optocoupler, a second resistor, a second diode and a second transmitting switch, the first end of the second receiving optocoupler is electrically connected to the neutral line, the second end of the second receiving optocoupler is electrically connected to the third end of the second transmitting optocoupler, the third end of the second receiving optocoupler is electrically connected to the second preset power supply, the fourth end of the second receiving optocoupler is electrically connected to the second control circuit, the first end of the second transmitting optocoupler is electrically connected to the second preset power supply, the second end of the second transmitting optocoupler is electrically connected to the second control circuit through the second transmitting switch, the fourth end of the second transmitting optocoupler is electrically connected to the anode of the second diode through the second resistor, and the cathode of the second diode is electrically connected to the communication line; wherein, One end of the auxiliary loop is electrically connected to the first end of the second receiving optocoupler or the second end of the second receiving optocoupler, and the other end of the auxiliary loop is electrically connected to the fourth end of the second transmitting optocoupler, the anode of the second diode, or the cathode of the second diode; In the pre-charging stage, the second control circuit controls the second transmitting optocoupler to be in an off state, so that the second current loop circuit is in an off state.

8. The air conditioner according to any one of claims 1 to 7, characterized in that: The first current loop circuit includes: a first receiving optocoupler, a first transmitting optocoupler, a first resistor, a first diode and a first transmitting switch, wherein the first end of the first receiving optocoupler is electrically connected to the cathode of the first diode through the first resistor, the anode of the first diode is electrically connected to the communication line, the second end of the first receiving optocoupler is electrically connected to the third end of the first transmitting optocoupler, the third end of the first receiving optocoupler is electrically connected to a first preset power supply, the fourth end of the first receiving optocoupler is electrically connected to the first control circuit, the first end of the first transmitting optocoupler is electrically connected to the first preset power supply, the second end of the first transmitting optocoupler is electrically connected to the first control circuit through the first transmitting switch, and the fourth end of the first transmitting optocoupler is electrically connected to the communication power supply circuit; wherein, In the pre-charging stage, the first control circuit controls the on-off of the first transmitting switch according to a preset frequency and a preset duty cycle to control the first current loop circuit.

9. The air conditioner according to claim 1, wherein: The first device further includes a first power supply circuit electrically connected to the live wire and the neutral wire, and configured to supply power to the first device.

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