Air conditioner

Abstract

The utility model provides a kind of air conditioner, air conditioner includes: alternating current input circuit, for output power signal;Photoelectric coupling circuit, for receiving power signal;Zero-crossing detection circuit, for transmission or isolation the power signal, output correction zero-crossing signal;Communication circuit, for receiving power signal, the communication signal output of communication transmitting port is to communication receiving port, the utility model passes through zero-crossing detection circuit and communication circuit share photoelectric coupling circuit, under the premise that zero-crossing detection function and communication function are realized simultaneously, the number of devices required by separate circuit is saved, to reduce the manufacturing cost of air conditioner, and save space for the layout of printed board.

Description

Technical Field

[0001] This utility model relates to the field of air conditioner technology, and in particular to an air conditioner. Background Technology

[0002] In the existing technology, the zero-crossing detection circuit and the communication circuit are independent circuits that implement their respective functions, and the control methods are also independent of each other. The zero-crossing detection circuit is connected from the AC input circuit to the zero-crossing detection port of the chip port through devices such as diodes, power resistors and optocouplers. The communication circuit is connected from the AC input circuit to the communication transceiver port of the chip port through power resistors and optocouplers. Both circuits need to use one or more power resistors to realize the zero-crossing detection function and the indoor and outdoor communication function. This not only increases the number of components in the circuit, thus increasing the circuit cost, but also brings certain limitations to the layout of the printed circuit board. Utility Model Content

[0003] This utility model aims to solve at least one of the technical problems existing in the prior art.

[0004] Therefore, one objective of this utility model is to provide an air conditioner that uses a shared optocoupler circuit for both the zero-crossing detection circuit and the communication circuit. This allows for the simultaneous realization of both zero-crossing detection and communication functions while reducing the number of components required for separate circuits, thereby lowering the manufacturing cost of the air conditioner and saving space for the layout of the printed circuit board.

[0005] To achieve the above objectives, a first aspect of this utility model provides an air conditioner comprising: an AC input circuit for outputting a power signal; an optocoupler circuit, wherein a first terminal of the optocoupler circuit is connected to a first terminal of the AC input circuit, and a second terminal of the optocoupler circuit is connected to a first power source for transmitting or isolating the power signal; a zero-crossing detection circuit, wherein a first terminal of the zero-crossing detection circuit is connected to a third terminal of the optocoupler circuit, a second terminal of the zero-crossing detection circuit is connected to a zero-crossing detection port, and a third terminal of the zero-crossing detection circuit is grounded for receiving the power signal and outputting a corrected zero-crossing signal; and a communication circuit, wherein a first terminal of the communication circuit is connected to a fourth terminal of the optocoupler circuit, a second terminal of the communication circuit is connected to a communication transmitting port, a third terminal of the communication circuit is grounded, a fourth terminal of the communication circuit is connected to a communication receiving port, a fifth terminal of the communication circuit is grounded, a sixth terminal of the communication circuit is connected to the third terminal of the AC input circuit, and a seventh terminal of the communication circuit is connected to the second terminal of the AC input circuit for receiving the power signal, and the communication signal from the communication transmitting port is output to the communication receiving port.

[0006] According to the embodiment of this utility model, the air conditioner uses an optocoupler circuit between the AC input circuit, the zero-crossing detection circuit, and the communication circuit. The zero-crossing detection circuit receives the power signal output from the AC input circuit through the optocoupler circuit, and determines the corrected zero-crossing signal based on the magnitude relationship between the power signal and the preset power signal, thus realizing the zero-crossing detection function of the zero-crossing detection circuit. The communication circuit receives the power signal output from the AC input circuit, and outputs the high and low levels of the communication signal emitted from the communication transmitting port to the communication receiving port, thus realizing the indoor and outdoor communication function of the communication circuit. By sharing the optocoupler circuit between the zero-crossing detection circuit and the communication circuit, the number of components required for separate circuits is reduced while simultaneously realizing the zero-crossing detection function and the communication function, thereby reducing the manufacturing cost of the air conditioner and saving space for the layout of the printed circuit board.

[0007] In some embodiments, the zero-crossing detection circuit includes: a first filtering module, a first terminal of which is connected to the third terminal of the optocoupler circuit, the third terminal of which is grounded, for receiving the power signal and filtering out high-frequency noise and fluctuation noise of the power signal; an isolation module, a first terminal of which is connected to the second terminal of the first filtering module, the second terminal of which is connected to a second power supply, the fourth terminal of which is grounded, for receiving the filtered power signal and outputting a corrected zero-crossing signal; and a second filtering module, a first terminal of which is connected to the third terminal of the isolation module, the second terminal of which is connected to the zero-crossing detection port, the third terminal of which is grounded, for receiving the corrected zero-crossing signal and filtering out high-frequency noise and fluctuation noise of the zero-crossing detection signal.

[0008] In some embodiments, the communication circuit includes: a power input module, the first end of which is connected to the fourth end of the optocoupler circuit, and the third end of which is connected to the second end of the AC input circuit, for receiving the power signal; a first optocoupler transmission module, the first end of which is connected to the second end of the power input module, the second end of which is connected to the communication transmitting port, and the third end of which is grounded, for receiving the communication signal output from the communication transmitting port; and a second optocoupler transmission module, the first end of which is connected to the fourth end of the first optocoupler transmission module, the second end of which is connected to the communication receiving port, and the third end of which is grounded, for outputting the communication signal to the communication receiving port.

[0009] In some embodiments, the first filtering module includes: a first resistor, one end of which is connected to the third terminal of the optocoupler circuit, and the other end of which is grounded; and a first capacitor, one end of which is connected to the third terminal of the optocoupler circuit, and the other end of which is grounded.

[0010] In some embodiments, the isolation module includes: a second resistor, one end of which is connected to a third terminal of the optocoupler circuit; a first transistor, the base of which is connected to the other end of the second resistor, and the emitter of which is grounded; and a third resistor, one end of which is connected to the second power supply, and the other end of which is connected to the collector of the first transistor.

[0011] In some embodiments, the second filtering module includes: a fourth resistor, one end of which is connected to the collector of the first transistor, and the other end of which is connected to a zero-crossing detection port; and a second capacitor, one end of which is connected to the zero-crossing detection port, and the other end of which is grounded.

[0012] In some embodiments, the power input module includes: a fifth resistor, one end of which is connected to the fourth terminal of the optocoupler circuit; a first diode, one end of which is connected to the other end of the fifth resistor, and the other end of which is connected to the second terminal of the AC input circuit; a second diode, one end of which is connected to the other end of the fifth resistor; a first Zener diode, one end of which is connected to the other end of the second diode, and the other end of which is connected to the second terminal of the AC input circuit; a third capacitor, one end of which is connected to the other end of the second diode, and the other end of which is connected to the second terminal of the AC input circuit; a sixth resistor, one end of which is connected to the other end of the second diode, and the other end of which is connected to the second terminal of the AC input circuit; and a fourth capacitor, one end of which is connected to the other end of the second diode, and the other end of which is connected to the second terminal of the AC input circuit.

[0013] In some embodiments, the first optocoupler transmission module includes: a seventh resistor, one end of which is connected to the communication transmitting port; an eighth resistor, one end of which is connected to the other end of the seventh resistor, and the other end of the seventh resistor is grounded; and a first optocoupler, a first end of which is connected to the other end of the seventh resistor, a second end of which is connected to the other end of the eighth resistor, and a fourth end of which is connected to the other end of the second diode.

[0014] In some embodiments, the second optocoupler transmission module includes: a second optocoupler, a first end of which is connected to a third end of the first optocoupler, and a second end of which is connected to a second power supply; a ninth resistor, one end of which is connected to the third end of the second optocoupler, and the other end of which is connected to the communication receiving port; a tenth resistor, one end of which is connected to the third end of the second optocoupler, and the other end of which is grounded; and a fifth capacitor, one end of which is connected to the other end of the ninth resistor, and the other end of which is grounded.

[0015] In some embodiments, the second optocoupler transmission module further includes: a thermistor, one end of which is connected to the third terminal of the AC input circuit, and the other end of which is connected to the fourth terminal of the second optocoupler; and an eleventh resistor, one end of which is connected to the third terminal of the first optocoupler, and the other end of which is connected to the other end of the thermistor.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a hardware connection diagram based on existing zero-crossing detection circuits; Figure 2 It is a hardware connection diagram of a communication circuit based on existing technology; Figure 3 This is a hardware connection diagram of an air conditioner according to an embodiment of the present invention; Figure 4 This is a hardware structure diagram of a zero-crossing detection circuit according to an embodiment of the present invention; Figure 5 This is a hardware structure diagram of a communication circuit according to an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the determination and correction of zero-crossing signals according to an embodiment of the present invention.

[0018] Figure label: Air conditioner 1; AC input circuit 11; optocoupler circuit 12; zero-crossing detection circuit 13; communication circuit 14; First filtering module 131; Isolation module 132; Second filtering module 133; Power input module 141; first optocoupler transmission module 142; second optocoupler transmission module 143; First resistor R3; First capacitor C1; Second resistor R4; First transistor V4; Third resistor R5; Fourth resistor R6; Second capacitor C2; Fifth resistor R7; First diode V7; Second diode V5; First Zener diode V6; Third capacitor C3; Sixth resistor R10; Fourth capacitor C4; Seventh resistor R13; Eighth resistor R12; First optocoupler B2; Second optocoupler B3; Ninth resistor R14; Tenth resistor R15; Fifth capacitor C5; Thermistor RT1; Eleventh resistor R11. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0021] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] In existing technologies, such as Figure 1 As shown, the positive and negative half-cycles of the AC input circuit pass through diodes V1 and V2 of the zero-crossing detection circuit, respectively, and then through power resistor R1 to the primary side of optocoupler B. The secondary side of optocoupler B is connected to the RC filter module composed of R3 and C1, and to the transistor V4 through the current-limiting resistor R4. The collector of the transistor is connected to the 5V power supply through R5, and to the zero-crossing detection port ZERO of the chip port through the current-limiting resistor R6. The emitter of the transistor is connected to ground GND.

[0024] In existing technologies, such as Figure 2 As shown, the AC input circuit's AC power is connected to the secondary side of optocoupler B21 through the power resistor R7 and diode V5 of the communication circuit. The primary side of optocoupler B21 is connected to the communication transmitter port TXD of the chip port through the current limiting resistor R13. The signal line is connected to the primary side of optocoupler B31 through the thermistor RT1. The secondary side of optocoupler B31 is connected to the communication receiver port RXD through the current limiting resistor R14.

[0025] The following is combined Figures 3-6 The present invention describes an air conditioner 1.

[0026] like Figure 3 As shown, the air conditioner 1 of this utility model includes: an AC input circuit 11, an optocoupler circuit 12, a zero-crossing detection circuit 13, and a communication circuit 14. The optocoupler circuit 12 adopts a bidirectional thyristor transistor optocoupler, for example, denoted as B1, which is composed of a light-emitting diode at the input end and a bidirectional thyristor or a transistor at the output end for auxiliary control, realizing electro-optical-electric conversion and control, and realizing the dual functions of electrical isolation and signal transmission.

[0027] For example, the bidirectional thyristor optocoupler B1 uses an optical signal as an intermediate medium to completely isolate the input side of the optocoupler circuit 12 (i.e., the AC input circuit 11) from the output side (i.e., the zero-crossing detection circuit 13 and / or the communication circuit 14), avoiding direct electrical connection between the two circuits. For instance, it can block the direct current path between high and low voltage, preventing high voltage from entering the low voltage side and damaging precision components such as CPUs and sensors, while ensuring operator safety. Alternatively, it can isolate different ground potentials. In complex electronic systems such as automotive electronics and industrial control systems, different modules may have ground potential differences, i.e., common-mode voltages. Direct connection will generate common-mode interference, such as noise and surges. The bidirectional thyristor optocoupler B1 cuts off the common-mode current path and suppresses interference through electro-optical-electro-electrical conversion, ensuring the accuracy of signal transmission.

[0028] The bidirectional thyristor optocoupler B1 achieves isolation while transmitting electrical signals proportionally or in a switching manner, supporting the transmission of various signal types, such as switching signal transmission and analog signal transmission.

[0029] The AC input circuit 11 is used to output a power signal; the first terminal of the optocoupler circuit 12 is connected to the first terminal L-FUSE of the AC input circuit 11, and the second terminal of the optocoupler circuit 12 is connected to the first power supply 12V, used to transmit or isolate the power signal; the first terminal of the zero-crossing detection circuit 13 is connected to the third terminal of the optocoupler circuit 12, the second terminal of the zero-crossing detection circuit 13 is connected to the zero-crossing detection port ZERO, and the third terminal of the zero-crossing detection circuit 13 is grounded, used to receive the power signal and output a corrected zero-crossing signal; the first terminal of the communication circuit 14 is connected to the fourth terminal of the optocoupler circuit 12, the second terminal of the communication circuit 14 is connected to the communication transmitting port TXD, the third terminal of the communication circuit 14 is grounded, the fourth terminal of the communication circuit 14 is connected to the communication receiving port RXD, the fifth terminal of the communication circuit 14 is grounded, the sixth terminal of the communication circuit 14 is connected to the third terminal SI of the AC input circuit 11, and the seventh terminal of the communication circuit 14 is connected to the second terminal NIN of the AC input circuit 11, used to receive the power signal, and the communication signal of the communication transmitting port TXD is output to the communication receiving port RXD.

[0030] In this embodiment, the AC input circuit 11 outputs a power signal, the optocoupler circuit 12 transmits or isolates the power signal, and after the zero-crossing detection circuit 13 receives the power signal, the zero-crossing detection circuit 13 starts to work. It determines the corrected zero-crossing signal according to the magnitude relationship between the power signal and the preset power signal, so as to obtain a more accurate drive signal for the air conditioner's fan. The preset power signal can be set by the communication circuit 14 to realize the zero-crossing detection function of the zero-crossing detection circuit 13.

[0031] After receiving the power signal output by the AC input circuit 11, the communication circuit 14 considers that a communication transmission command has been received. It then conducts the connection loop between the first terminal of the optocoupler circuit 12 and the first terminal L-FUSE of the AC input circuit 11, as well as the connection loop between the first terminal of the communication circuit 14 and the fourth terminal of the optocoupler circuit 12. The communication transmission port TXD emits high and low levels of the communication signal. The communication circuit 14 receives the high and low levels of the communication signal, converts the electrical signal into an optical signal, changes the conduction state of the communication circuit 14 itself, and outputs the high and low levels of the communication signal to the communication receiving port RXD, thereby realizing the indoor and outdoor communication function of the communication circuit 14.

[0032] According to the embodiment of the present invention, the air conditioner 1 uses an optocoupler circuit 12 between the AC input circuit 11, the zero-crossing detection circuit 13, and the communication circuit 14. The zero-crossing detection circuit 13 receives the power signal output from the AC input circuit 11 through the optocoupler circuit 12, and determines the corrected zero-crossing signal based on the magnitude relationship between the power signal and the preset power signal, thereby realizing the zero-crossing detection function of the zero-crossing detection circuit 13. The communication circuit 14 receives the power signal output from the AC input circuit 11, and outputs the high and low levels of the communication signal emitted from the communication transmitting port TXD to the communication receiving port RXD, thereby realizing the indoor and outdoor communication function of the communication circuit 14. By sharing the optocoupler circuit 12 between the zero-crossing detection circuit 13 and the communication circuit 14, the number of components required for separate circuits is reduced while simultaneously realizing the zero-crossing detection function and the communication function, thereby reducing the manufacturing cost of the air conditioner 1 and saving space for the layout of the printed circuit board.

[0033] In some embodiments, such as Figure 3 As shown, the zero-crossing detection circuit 13 includes: a first filtering module 131, an isolation module 132, and a second filtering module 133, wherein, The first terminal of the first filtering module 131 is connected to the third terminal of the optocoupler circuit 12, and the third terminal of the first filtering module 131 is grounded. It is used to receive power signals and filter out high-frequency noise and fluctuation noise in the power signals. By filtering out high-frequency noise, high-frequency interference can be avoided from affecting the normal operation of subsequent circuits, such as preventing control signals from being falsely triggered or loads from operating abnormally. Filtering out fluctuation noise can stabilize the voltage or current amplitude of the power signal, reduce irregular fluctuations in the signal, and make the determined filtered power signal closer to the ideal power waveform. This provides a stable and clean power input for subsequent circuits, improving the overall reliability, operating accuracy, and anti-interference capability of the air conditioner.

[0034] The first terminal of isolation module 132 is connected to the second terminal of the first filter module 131, and the second terminal of isolation module 132 is connected to the second 5V power supply. The fourth terminal of isolation module 132 is grounded and used to receive the filtered power supply signal and output a corrected zero-crossing signal. Based on the magnitude relationship between the power supply signal and the preset power supply signal, the system determines whether the signal has crossed zero, the time of zero-crossing, the direction of deviation, and the degree of deviation, thus determining the corrected zero-crossing signal. This corrected zero-crossing signal can compensate for errors in the original zero-crossing signal, such as zero-crossing time offset caused by noise interference, making the zero-crossing signal more closely match the actual power supply phase characteristics. Providing a reliable input for subsequent processing, the generated corrected zero-crossing signal serves as the input source for the second filter module 133. After further filtering, it provides a more accurate zero-crossing reference for the air conditioner 1, ensuring that subsequent control of the air conditioner's load, such as the fan, is highly synchronized with the power supply cycle, improving control accuracy and equipment operational stability.

[0035] The first terminal of the second filtering module 133 is connected to the third terminal of the isolation module 132, the second terminal of the second filtering module 133 is connected to the zero-crossing detection port ZERO, and the third terminal of the second filtering module 133 is grounded. This module receives the corrected zero-crossing signal and filters out high-frequency noise and fluctuation noise from the zero-crossing detection signal. Filtering out high-frequency noise avoids misjudgments of the zero-crossing time caused by high-frequency interference, such as preventing false zero-crossing pulses from triggering the control circuit. Filtering out fluctuation noise eliminates irregular jitter in the signal amplitude, making the zero-crossing edge (rising or falling edge) of the filtered corrected zero-crossing signal clearer and steeper. This provides a more accurate and reliable zero-crossing time reference for subsequent circuits, improving the synchronization control accuracy, anti-interference capability, and operational stability of the entire device.

[0036] In some embodiments, such as Figure 3 As shown, the communication circuit 14 includes: a power input module 141, a first optical coupler transmission module 142, and a second optical coupler transmission module 143, wherein... The first terminal of the power input module 141 is connected to the fourth terminal of the optocoupler circuit 12, and the third terminal of the power input module 141 is connected to the second terminal NIN of the AC input circuit 11, for receiving power signals; the first terminal of the first optocoupler transmission module 142 is connected to the second terminal of the power input module 141, the second terminal of the first optocoupler transmission module 142 is connected to the communication transmitting port TXD, and the third terminal of the first optocoupler transmission module 142 is grounded, for receiving communication signals output from the communication transmitting port TXD; the first terminal of the second optocoupler transmission module 143 is connected to the fourth terminal of the first optocoupler transmission module 142, the second terminal of the second optocoupler transmission module 143 is connected to the communication receiving port RXD, and the third terminal of the second optocoupler transmission module 143 is grounded, for outputting communication signals to the communication receiving port RXD.

[0037] In this embodiment, after the communication circuit 14 receives the power signal output by the AC input circuit 11, it considers that a communication transmission command has been received. Therefore, it connects the first terminal of the optocoupler circuit 12 and the first terminal L-FUSE of the AC input circuit 11, as well as the first terminal of the power input module 141 and the fourth terminal of the optocoupler circuit 12. The power input module 141 receives the power signal, and the communication transmission port TXD emits high and low levels of the communication signal. The first optocoupler transmission module 142 receives the high and low levels of the communication signal, converts the electrical signal into an optical signal, changes the conduction state of the first optocoupler transmission module 142, and outputs the high and low levels of the communication signal to the second optocoupler transmission module 143. Similarly, it changes the conduction state of the second optocoupler transmission module 143, converts the electrical signal into an optical signal, and outputs the high and low levels of the communication signal to the communication receiving port RXD to realize the indoor and outdoor communication function of the communication circuit 14.

[0038] In some embodiments, such as Figure 4As shown, the first filter module 131 includes: a first resistor, for example denoted as R3, and a first capacitor, for example denoted as C1, wherein, One end of the first resistor R3 is connected to the third terminal of the optocoupler circuit 12, and the other end of the first resistor R3 is grounded; one end of the first capacitor C1 is connected to the third terminal of the optocoupler circuit 12, and the other end of the first capacitor C1 is grounded; the first filter module 131 filters out high-frequency noise and fluctuation noise of the power supply signal, and determines the filtered power supply signal. By filtering out high-frequency noise, high-frequency interference can be avoided from affecting the normal operation of subsequent circuits, such as preventing control signals from being falsely triggered or loads from operating abnormally. Filtering out fluctuation noise can stabilize the voltage or current amplitude of the power supply signal, reduce irregular fluctuations in the signal, and make the determined filtered power supply signal closer to the ideal power supply waveform, thereby providing a stable and clean power input for subsequent circuits and improving the overall reliability, operating accuracy, and anti-interference capability of the air conditioner.

[0039] In some embodiments, such as Figure 4 As shown, the isolation module 132 includes: a second resistor, for example denoted as R4; a first transistor, for example denoted as V4; and a third resistor, for example denoted as R5, wherein... One end of the second resistor R4 is connected to the third end of the optocoupler circuit 12; the base of the first transistor V4 is connected to the other end of the second resistor R4, and the emitter of the first transistor V4 is grounded; one end of the third resistor R5 is connected to the second power supply 5V, and the other end of the third resistor R5 is connected to the collector of the first transistor V4.

[0040] In this embodiment, the first filtering module 131 filters out high-frequency noise and fluctuation noise of the power signal. After determining the filtered power signal, it outputs the filtered power signal to the isolation module 132. The isolation module 132 determines the absolute value of the filtered power signal and determines the zero-crossing correction signal based on the relationship between the absolute value and the preset power signal, so as to obtain a more accurate drive signal for the air conditioner's fan.

[0041] In some embodiments, such as Figure 4 As shown, the second filter module 133 includes: a fourth resistor, for example denoted as R6, and a second capacitor, for example denoted as C2, wherein, One end of the fourth resistor R6 is connected to the collector of the first transistor V4, and the other end of the fourth resistor R6 is connected to the zero-crossing detection port ZERO; one end of the second capacitor C2 is connected to the zero-crossing detection port ZERO, and the other end of the second capacitor C2 is grounded. The second filter module 133 filters out high-frequency noise and fluctuation noise of the corrected zero-crossing signal to determine the filtered corrected zero-crossing signal. By filtering out high-frequency noise, misjudgment of the zero-crossing time caused by high-frequency interference can be avoided, such as preventing false zero-crossing pulses from triggering the control circuit. Filtering out fluctuation noise can eliminate irregular jitter of the signal amplitude, making the zero-crossing edge of the filtered corrected zero-crossing signal, i.e., the rising edge or falling edge, clearer and steeper, thereby providing a more accurate and reliable zero-crossing time reference for subsequent circuits and improving the synchronization control accuracy, anti-interference capability, and operational stability of the entire device.

[0042] In some embodiments, such as Figure 5 As shown, the power input module 141 includes: a fifth resistor, for example denoted as R7; a first diode, for example denoted as V7; a second diode, for example denoted as V5; a first Zener diode, for example denoted as V6; a third capacitor, for example denoted as C3; a sixth resistor, for example denoted as R10; and a fourth capacitor, for example denoted as C4. One end of the fifth resistor R7 is connected to the fourth terminal of the optocoupler circuit 12; one end of the first diode V7 is connected to the other end of the fifth resistor R7, and the other end of the first diode V7 is connected to the second terminal NIN of the AC input circuit 11; one end of the second diode V5 is connected to the other end of the fifth resistor R7; one end of the first Zener diode V6 is connected to the other end of the second diode V5, and the other end of the first Zener diode V6 is connected to the second terminal NIN of the AC input circuit 11; one end of the third capacitor C3 is connected to the other end of the second diode V5, and the other end of the third capacitor C3 is connected to the second terminal NIN of the AC input circuit 11; one end of the sixth resistor R10 is connected to the other end of the second diode V5, and the other end of the sixth resistor R10 is connected to the second terminal NIN of the AC input circuit 11; one end of the fourth capacitor C4 is connected to the other end of the second diode V5, and the other end of the fourth capacitor C4 is connected to the second terminal NIN of the AC input circuit 11, thus realizing the power input function. Through fuse overcurrent protection, diode rectification / reverse protection, Zener diode voltage limiting, and capacitor filtering, a stable and safe 24V power supply is provided for the subsequent circuits.

[0043] In some embodiments, such as Figure 5 As shown, the first optical coupler transmission module 142 includes: a seventh resistor, for example denoted as R13, an eighth resistor, for example denoted as R12, and a first optical coupler, for example denoted as B2, wherein... One end of the seventh resistor R13 is connected to the communication transmitting port TXD; one end of the eighth resistor R12 is connected to the other end of the seventh resistor R13, and the other end of the seventh resistor R13 is grounded; the first end of the first optocoupler B2 is connected to the other end of the seventh resistor R13, the second end of the first optocoupler B2 is connected to the other end of the eighth resistor R12, and the fourth end of the first optocoupler B2 is connected to the other end of the second diode V5. Electrical isolation is achieved using the first optocoupler B2, and the communication signal output from the communication transmitting port TXD is converted to an optical signal and then output to the second optocoupler transmission module 143, ensuring the anti-interference and security of the signal transmission process.

[0044] In some embodiments, such as Figure 5 As shown, the second optical coupler transmission module 143 includes: a second optical coupler, for example denoted as B3; a ninth resistor, for example denoted as R14; a tenth resistor, for example denoted as R15; and a fifth capacitor, for example denoted as C5, wherein... The first terminal of the second optocoupler B3 is connected to the third terminal of the first optocoupler B2, and the second terminal of the second optocoupler B3 is connected to the second power supply 5V; one terminal of the ninth resistor R14 is connected to the third terminal of the second optocoupler B3, and the other terminal of the ninth resistor R14 is connected to the communication receiving port RXD; one terminal of the tenth resistor R15 is connected to the third terminal of the second optocoupler B3, and the other terminal of the tenth resistor R15 is grounded; one terminal of the fifth capacitor C5 is connected to the other terminal of the ninth resistor R14, and the other terminal of the fifth capacitor C5 is grounded.

[0045] In some embodiments, such as Figure 5 As shown, the second optical coupler transmission module 143 further includes: a thermistor, for example denoted as RT1, and an eleventh resistor, for example denoted as R11, wherein, One end of the thermistor RT1 is connected to the third terminal of the AC input circuit 11, i.e., the SI input line, and the other end of the thermistor RT1 is connected to the fourth terminal of the second optocoupler B3. One end of the eleventh resistor R11 is connected to the third terminal of the first optocoupler B2, and the other end of the eleventh resistor R11 is connected to the other end of the thermistor RT1. The second optocoupler B3 is used to achieve electrical isolation, receive the communication signal output by the first optocoupler transmission module 142, realize data reception, and also ensure the stability and anti-interference capability of the signal transmission process.

[0046] In this embodiment, after the power signal is output by the AC input circuit 11, it is assumed that the communication circuit 14 has received a communication transmission command. The communication transmission port TXD emits a high level of communication signal, the primary side of the first optocoupler B2 is turned on, the electrical signal is converted into an optical signal, and the secondary side of the first optocoupler B2 is turned on. At the same time, the primary side of the second optocoupler B3 is turned on, the electrical signal is converted into an optical signal, and the secondary side of the second optocoupler B3 is turned on. The communication receiving port RXD reads the high level information of the communication signal output by the communication transmission port TXD.

[0047] When the communication transmitting port TXD emits a low-level communication signal, the primary side of the first optocoupler B2 is cut off, which also cuts off the secondary side of the first optocoupler B2. At the same time, the primary side of the second optocoupler B3 is cut off. The communication receiving port RXD reads the low-level information of the communication signal output by the communication transmitting port TXD, thereby realizing the indoor and outdoor communication function of the communication circuit 14.

[0048] like Figure 6 As shown, because the third capacitor C3 in the communication circuit 14 is a small electrolytic capacitor, the presence of the third capacitor C3 and the first Zener diode V6 keeps the voltage at the fourth terminal of the first optocoupler B2 at around U1V. The voltage at point B of the communication circuit 14 is always higher than U2=U1+I×R7, where I is the conduction current of the first optocoupler B2.

[0049] When the power signal output by the AC input circuit 11 is, for example, the AC input voltage, the zero-crossing detection circuit determines the absolute value of the power signal, i.e., the amplitude of the AC input voltage. When the amplitude of the AC input voltage is lower than U2, both the forward and reverse diodes of the optocoupler circuit 12, i.e., the bidirectional thyristor optocoupler B1, are cut off, the secondary side is in the cut-off state, the first transistor V4 is in the cut-off state, the zero-crossing detection port ZERO of the chip port receives a high level, and the chip port detects the zero-crossing signal. When the power signal output by the AC input circuit 11, for example, the AC transmission voltage, is in the positive and negative half-cycles and the amplitude of the AC input voltage is greater than Uc, the forward diode of the optocoupler circuit 12 conducts, and then the secondary side conducts. The first power supply 12V starts to supply power to the base of the first transistor V4, the collector and emitter of the first transistor V4 conduct, the voltage at the collector is set to 0, the zero-crossing detection circuit starts to work, and the zero-crossing detection port ZERO of the chip port detects a low level.

[0050] Taking the first zero-crossing signal t0 as an example, the absolute value of the time from the rising edge of the zero-crossing signal t0 to U2 is detected, and the corresponding time is determined as T2n. The absolute value of the time from the falling edge of the zero-crossing signal t0 to U2 is detected and the corresponding time is recorded as T2n+1. The time difference between the time T2n+1 corresponding to the falling edge of the zero-crossing signal t0 and the time T2n corresponding to the rising edge of the zero-crossing signal t0 is calculated. The time difference is determined as the zero-crossing signal pulse time, i.e., tn = T2n+1 - T2n. Similarly, the pulse times of multiple zero-crossing signals are calculated, and the average zero-crossing signal pulse time t of multiple zero-crossing signal pulse times is calculated. For example, the average zero-crossing signal pulse time t of every 10 zero-crossing signal pulse times is calculated as t = (tn + tn-1 + ... + tn-10) / 10. Taking the average value can determine a more accurate zero-crossing signal pulse time and avoid the situation where the error of a single acquisition is large.

[0051] Based on multiple first detection times T2n and the average zero-crossing signal pulse time t, multiple corrected zero-crossing signals are determined. For example, the first corrected zero-crossing point ZREO1=T2n+t / 2 is used as the zero point for the air conditioner's controller to control the fan drive. Similarly, multiple subsequent corrected zero-crossing points are calculated.

[0052] When the power signal output by the AC input circuit 11, such as the AC transmission voltage, is in the positive and negative half-cycles and its absolute value is greater than U2, the forward diode of the optocoupler circuit 12, i.e., the bidirectional thyristor transistor optocoupler B1, is turned on, and then the secondary side is turned on. The first power supply 12V starts to supply power to the base of the first transistor V4. The collector and emitter of the first transistor V4 are turned on, the voltage at the collector is set to 0, and the zero-crossing detection port ZERO of the chip port detects a low level.

[0053] According to the embodiment of the present invention, the air conditioner 1 uses an optocoupler circuit 12 between the AC input circuit 11, the zero-crossing detection circuit 13, and the communication circuit 14. The zero-crossing detection circuit 13 receives the power signal output from the AC input circuit 11 through the optocoupler circuit 12, and determines the corrected zero-crossing signal based on the magnitude relationship between the power signal and the preset power signal, thereby realizing the zero-crossing detection function of the zero-crossing detection circuit 13. The communication circuit 14 receives the power signal output from the AC input circuit 11, and outputs the high and low levels of the communication signal emitted from the communication transmitting port TXD to the communication receiving port RXD, thereby realizing the indoor and outdoor communication function of the communication circuit 14. By sharing the optocoupler circuit 12 between the zero-crossing detection circuit 13 and the communication circuit 14, the number of components required for separate circuits is reduced while simultaneously realizing the zero-crossing detection function and the communication function, thereby reducing the manufacturing cost of the air conditioner 1 and saving space for the layout of the printed circuit board.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0055] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioner, characterized in that, include: AC input circuit, used to output power signal; An optocoupler circuit, wherein a first terminal of the optocoupler circuit is connected to a first terminal of the AC input circuit, and a second terminal of the optocoupler circuit is connected to a first power supply, for transmitting or isolating the power supply signal; A zero-crossing detection circuit is provided, wherein the first terminal of the zero-crossing detection circuit is connected to the third terminal of the optocoupler circuit, the second terminal of the zero-crossing detection circuit is connected to the zero-crossing detection port, and the third terminal of the zero-crossing detection circuit is grounded, for receiving the power signal and outputting a corrected zero-crossing signal. The communication circuit has a first terminal connected to the fourth terminal of the optocoupler circuit, a second terminal connected to the communication transmitting port, a third terminal grounded, a fourth terminal connected to the communication receiving port, a fifth terminal grounded, a sixth terminal connected to the third terminal of the AC input circuit, and a seventh terminal connected to the second terminal of the AC input circuit. The communication circuit is used to receive the power signal, and the communication signal from the communication transmitting port is output to the communication receiving port.

2. The air conditioner according to claim 1, characterized in that, The zero-crossing detection circuit includes: A first filtering module, wherein the first end of the first filtering module is connected to the third end of the optocoupler circuit and the third end of the first filtering module is grounded, is used to receive the power signal and filter out high-frequency noise and fluctuation noise of the power signal; An isolation module is provided, wherein the first end of the isolation module is connected to the second end of the first filter module, the second end of the isolation module is connected to a second power supply, and the fourth end of the isolation module is grounded, for receiving the filtered power supply signal and outputting a corrected zero-crossing signal; The second filtering module has its first end connected to the third end of the isolation module, its second end connected to the zero-crossing detection port, and its third end grounded. It is used to receive the corrected zero-crossing signal and filter out high-frequency noise and fluctuation noise from the zero-crossing detection signal.

3. The air conditioner according to claim 1, characterized in that, The communication circuit includes: A power input module, wherein the first end of the power input module is connected to the fourth end of the optocoupler circuit, and the third end of the power input module is connected to the second end of the AC input circuit, for receiving the power signal; A first optical coupler transmission module has a first end connected to the second end of the power input module, a second end connected to the communication transmission port, and a third end grounded, used to receive the communication signal output by the communication transmission port. The second optical coupler transmission module has a first end connected to the fourth end of the first optical coupler transmission module, a second end connected to the communication receiving port, and a third end grounded, for outputting the communication signal to the communication receiving port.

4. The air conditioner according to claim 2, characterized in that, The first filtering module includes: A first resistor, one end of which is connected to the third terminal of the optocoupler circuit, and the other end of which is grounded; A first capacitor, one end of which is connected to the third terminal of the optocoupler circuit, and the other end of which is grounded.

5. The air conditioner according to claim 2, characterized in that, The isolation module includes: The second resistor, one end of which is connected to the third terminal of the optocoupler circuit; The first transistor has its base connected to the other end of the second resistor, and its emitter is grounded. A third resistor, one end of which is connected to the second power supply, and the other end of which is connected to the collector of the first transistor.

6. The air conditioner according to claim 2, characterized in that, The second filtering module includes: The fourth resistor has one end connected to the collector of the first transistor and the other end connected to the zero-crossing detection port. The second capacitor has one end connected to the zero-crossing detection port and the other end grounded.

7. The air conditioner according to claim 3, characterized in that, The power input module includes: The fifth resistor, one end of which is connected to the fourth terminal of the optocoupler circuit; A first diode, one end of which is connected to the other end of the fifth resistor, and the other end of which is connected to the second terminal of the AC input circuit; A second diode, one end of which is connected to the other end of the fifth resistor; A first Zener diode, one end of which is connected to the other end of the second diode, and the other end of which is connected to the second terminal of the AC input circuit; A third capacitor, one end of which is connected to the other end of the second diode, and the other end of which is connected to the second terminal of the AC input circuit; A sixth resistor, one end of which is connected to the other end of the second diode, and the other end of which is connected to the second terminal of the AC input circuit; A fourth capacitor, one end of which is connected to the other end of the second diode, and the other end of which is connected to the second terminal of the AC input circuit.

8. The air conditioner according to claim 3, characterized in that, The first optical coupler transmission module includes: A seventh resistor, one end of which is connected to the communication transmitting port; An eighth resistor, one end of which is connected to the other end of the seventh resistor, and the other end of the seventh resistor is grounded; The first optocoupler has its first end connected to the other end of the seventh resistor, its second end connected to the other end of the eighth resistor, and its fourth end connected to the other end of the second diode.

9. The air conditioner according to claim 3, characterized in that, The second optical coupler transmission module includes: A second optocoupler, the first end of which is connected to the third end of the first optocoupler, and the second end of which is connected to a second power supply; A ninth resistor, one end of which is connected to the third terminal of the second optocoupler, and the other end of which is connected to the communication receiving port; The tenth resistor has one end connected to the third terminal of the second optocoupler and the other end grounded. The fifth capacitor has one end connected to the other end of the ninth resistor, and the other end of the fifth capacitor is grounded.

10. The air conditioner according to claim 9, characterized in that, The second optical coupler transmission module further includes: A thermistor, one end of which is connected to the third terminal of the AC input circuit, and the other end of which is connected to the fourth terminal of the second optocoupler; The eleventh resistor has one end connected to the third terminal of the first optocoupler and the other end connected to the other end of the thermistor.

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