Multifunctional circuit, indoor unit and air conditioner

Abstract

The application provides a multifunctional circuit, an indoor unit and an air conditioner; the multifunctional circuit comprises an upper human sensing component detection circuit and a lower human sensing component detection circuit, and through the cooperation of the upper human sensing component detection circuit and the lower human sensing component detection circuit, three functions of intelligent human sensing detection, sliding door detection and child hand anti-pinch are realized; in addition, the upper human sensing component detection circuit and the lower human sensing component detection circuit further respectively comprise an infrared emission tube driving module for emitting infrared light, an infrared light receiving module for receiving infrared light and a power filter module for supplying power to a controller, the circuit not only can reliably control the emission distance and effective range of the infrared light, but also has the advantages of low power consumption, stable infrared receiving signal, high circuit reliability, good filtering effect and EMC effect and low cost, and is convenient for popularization and implementation in practical application.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and in particular to multifunctional circuits, indoor units, and air conditioners. Background Technology

[0002] Currently, most cabinet air conditioners have the following problems: ① Lack of intelligent human detection function; the so-called intelligent human detection function means that when the air conditioner is in cooling or heating mode, if a person passes by or is in front of the air outlet, the air conditioner can detect the person's presence and adjust its operation accordingly, such as closing the lower air guide plate or closing all three air guide plates. Cooling or heating air will only blow out from small holes in the air guide plates, resulting in a very light and gentle breeze. This avoids the cooling or heating air blowing directly on people in front of the air outlet, improving user comfort. It also prevents users, such as children, from catching colds or other illnesses due to prolonged exposure to the air outlet. A small number of air conditioners... Human body recognition is achieved through radar, but radar is expensive and suffers from insufficient accuracy and high costs; ② There is no function to detect whether the sliding door is closed properly; specifically, the sliding door is mainly controlled by two sliding door stepper motors. If one or both malfunction, the sliding door will malfunction or fail to close properly, or the sliding door may not close properly when the unit is turned off due to human manipulation. Existing air conditioners do not have the function to check whether the sliding door is closed properly or to detect whether the sliding door motor is damaged; ③ There is no child-proof function; specifically, when the cabinet air conditioner is running, it cannot prevent children from inserting thin objects such as pencils or chopsticks into the air guide door, causing damage to the fan blades and other safety issues. Therefore, how to alleviate the above problems and improve the user experience is an urgent issue to be addressed. Summary of the Invention

[0003] In view of this, the object of the present invention is to provide a multifunctional circuit, an indoor unit and an air conditioner, so as to at least alleviate some of the above-mentioned technical problems.

[0004] In a first aspect, embodiments of the present invention provide a multifunctional circuit, comprising: an upper human detection component detection circuit and a lower human detection component detection circuit; wherein the upper human detection component detection circuit is connected to a controller via terminal CN1, and the lower human detection component detection circuit is connected to the controller via terminal CN2; the upper human detection component detection circuit comprises: a first infrared emitting diode driving module, a first infrared light receiving module, and a first power supply filtering module; wherein the first infrared emitting diode driving module comprises: a first switching unit, a first infrared emitting unit, and a second switching unit; the control terminal of the first switching unit is connected to a first pin of terminal CN1, and the control terminal of the second switching unit is connected to a second pin of terminal CN1, and the first switching unit, the first infrared emitting unit, and the second switching unit are connected sequentially; the first infrared light receiving module comprises a first receiving unit and a first power supply filtering unit; the first pin of the first receiving unit is connected to a fourth pin of terminal CN1, the second pin of the first receiving unit is grounded via the first power supply filtering unit, and the third pin of the first receiving unit is connected via the first power supply filtering unit. The circuit is connected to the operating voltage; the first power supply filtering module includes multiple filter capacitors; the multiple filter capacitors are connected in parallel, and one end is connected to the operating voltage and the fifth pin of terminal CN1 respectively, and the other end is grounded; the lower human detection component detection circuit includes: a second infrared emitting tube driving module, a second infrared light receiving module, and a second power supply filtering module; wherein, the second infrared emitting tube driving module includes: a second infrared emitting unit and a third switching unit; the control terminal of the third switching unit is connected to the first pin of terminal CN2, one end of the second infrared emitting unit is connected to the third switching unit, and the other end is connected to the operating voltage; the second infrared light receiving module includes a second receiving unit and a second power supply filtering unit; the first pin of the second receiving unit is connected to the third pin of terminal CN2, the second pin of the second receiving unit is grounded through the second power supply filtering unit, and the third pin of the second receiving unit is connected to the operating voltage through the second power supply filtering unit; the second power supply filtering module includes multiple filter capacitors; the multiple filter capacitors are connected in parallel, and one end is connected to the operating voltage and the fourth pin of terminal CN2 respectively, and the other end is grounded.

[0005] The aforementioned multifunctional circuit, through the coordinated operation of the upper and lower human detection component circuits, achieves three functions: intelligent human detection, sliding door detection, and child anti-pinch protection. Furthermore, the upper and lower human detection component circuits each include an infrared emitting tube driver module for emitting infrared light, an infrared light receiving module for receiving infrared light, and a power supply filter module for powering the controller. This circuit not only reliably controls the emission distance and effective range of infrared light but also boasts advantages such as low power consumption, stable infrared signal reception, high circuit reliability, good filtering and EMC performance, and low cost, making it easy to promote and implement in practical applications.

[0006] Preferably, the first infrared emitting unit includes multiple infrared emitting tubes; wherein the anodes of the multiple infrared emitting tubes are all connected to the first terminal of the first switching unit, the cathodes of the multiple infrared emitting tubes are all connected to the first terminal of the second switching unit, the second terminal of the first switching unit is connected to the operating voltage, and the second terminal of the second switching unit is grounded; the second infrared emitting unit includes multiple infrared emitting tubes; wherein the anodes of the multiple infrared emitting tubes are all connected to the operating voltage, the cathodes of the multiple infrared emitting tubes are all connected to the first terminal of the third switching unit, and the second terminal of the third switching unit is grounded.

[0007] Preferably, the first infrared emitting unit has three infrared emitting tubes arranged radially; the second infrared emitting unit has two infrared emitting tubes arranged vertically.

[0008] Preferably, the first infrared emitting diode driving module and the second infrared emitting diode driving module further include multiple regulating resistors; wherein, in the first infrared emitting diode driving module, the anode of each infrared emitting diode is connected to the first terminal of the first switching unit through two regulating resistors connected in parallel; and in the second infrared emitting diode driving module, the anode of each infrared emitting diode is connected to the operating voltage through two regulating resistors connected in parallel.

[0009] Preferably, the first infrared light receiving module further includes a first anti-interference resistor and a first pull-up resistor; wherein, one end of the first anti-interference resistor is connected to the first pin of the first receiving unit, and the other end is connected to the fourth pin of the terminal CN1; one end of the first pull-up resistor is connected to the operating voltage, and the other end is connected to the first anti-interference resistor and the first pin of the first receiving unit respectively.

[0010] Preferably, the second infrared light receiving module further includes a second anti-interference resistor and a second pull-up resistor; wherein, one end of the second anti-interference resistor is connected to the first pin of the second receiving unit, and the other end is connected to the third pin of the terminal CN2; one end of the second pull-up resistor is connected to the operating voltage, and the other end is connected to the second anti-interference resistor and the first pin of the second receiving unit respectively.

[0011] Preferably, the first power supply filtering unit includes multiple parallel filter capacitors and a first current-limiting resistor; wherein, the second pin and the third pin of the first receiving unit are respectively connected to the two ends of the filter capacitor of the first power supply filtering unit, and the second pin of the first receiving unit is grounded, and the third pin is connected to the operating voltage through the first current-limiting resistor; the second power supply filtering unit includes multiple parallel filter capacitors and a second current-limiting resistor; wherein, the second pin and the third pin of the second receiving unit are respectively connected to the two ends of the filter capacitor of the second power supply filtering unit, and the second pin of the second receiving unit is grounded, and the third pin is connected to the operating voltage through the second current-limiting resistor.

[0012] Secondly, embodiments of the present invention also provide an indoor unit, which is equipped with the multi-functional circuit described in the first aspect; wherein the multi-functional circuit includes an upper human detection component detection circuit and a lower human detection component detection circuit.

[0013] Thirdly, embodiments of the present invention also provide an air conditioner, which includes an indoor unit as described in the second aspect, and a controller; wherein the controller is connected to the upper human detection component detection circuit via terminal CN1 and to the lower human detection component detection circuit via terminal CN2.

[0014] Preferably, the controller is further configured to control the upper human sensor detection circuit and the lower human sensor detection circuit to emit infrared light, and to acquire the first infrared signal fed back by the upper human sensor detection circuit and the second infrared signal fed back by the lower human sensor detection circuit, and to implement corresponding functions based on the first infrared signal and the second infrared signal; wherein the functions include at least one of the following: intelligent human sensor detection function, sliding door detection function, and child anti-pinch function.

[0015] The embodiments of the present invention bring the following beneficial effects:

[0016] This invention provides a multifunctional circuit, an indoor unit, and an air conditioner. Through the coordinated operation of the upper and lower human detection component circuits, it achieves three functions: intelligent human detection, sliding door detection, and child pinch prevention. Furthermore, the upper and lower human detection component circuits each include an infrared emitting tube driver module for emitting infrared light, an infrared light receiving module for receiving infrared light, and a power supply filter module for powering the controller. This circuit not only reliably controls the emission distance and effective range of infrared light but also boasts advantages such as low power consumption, stable infrared signal reception, high circuit reliability, good filtering and EMC performance, and low cost, making it easy to promote and implement in practical applications.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a multifunctional circuit provided in an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram illustrating the arrangement of an infrared emitting diode according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram illustrating another infrared emitting diode configuration provided in an embodiment of the present invention;

[0023] Figure 4 A logic diagram of an intelligent human sensing detection function provided in an embodiment of the present invention;

[0024] Figure 5 A logic diagram of a child anti-pinch function provided in an embodiment of the present invention;

[0025] Figure 6 This is a logic diagram of a sliding door detection function provided in an embodiment of the present invention. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To facilitate understanding of this embodiment, the embodiments of the present invention will be described in detail below.

[0028] This invention provides a multifunctional circuit, which includes an upper human sensor component detection circuit and a lower human sensor component detection circuit; wherein the upper human sensor component detection circuit is connected to the controller via terminal CN1, and the lower human sensor component detection circuit is connected to the controller via terminal CN2.

[0029] Specifically, the human detection component includes: a first infrared emitting tube driving module, a first infrared light receiving module, and a first power supply filtering module; wherein, the first infrared emitting tube driving module includes: a first switching unit, a first infrared emitting unit, and a second switching unit; the control terminal of the first switching unit is connected to the first pin of terminal CN1, the control terminal of the second switching unit is connected to the second pin of terminal CN1, and the first switching unit, the first infrared emitting unit, and the second switching unit are connected in sequence.

[0030] Specifically, the aforementioned first infrared emitting unit includes multiple infrared emitting diodes; wherein the anodes of the multiple infrared emitting diodes are all connected to the first terminal of the first switching unit, and the cathodes are all connected to the first terminal of the second switching unit. The second terminal of the first switching unit is connected to the operating voltage, and the second terminal of the second switching unit is grounded. Furthermore, in the first infrared emitting diode driving module, the first pin of the aforementioned terminal CN1 can also be called the anode control port, and the second pin of terminal CN1 can also be called the cathode control port. Therefore, the controller controls the conduction or deactivation of the anodes and cathodes of the multiple infrared emitting diodes in the first infrared emitting unit through the first and second pins of terminal CN1, thereby controlling whether the multiple infrared emitting diodes emit infrared light. That is, the first emitting diode driving module adopts a circuit structure that controls the anodes and cathodes of the multiple infrared emitting diodes separately. This circuit structure is not only simple in structure but also reduces the detection failure rate, and has the advantage of low power consumption.

[0031] Similarly, the human detection component includes: a second infrared emitting diode driving module, a second infrared light receiving module, and a second power supply filtering module; wherein, the second infrared emitting diode driving module includes: a second infrared emitting unit and a third switching unit; the control terminal of the third switching unit is connected to the first pin of terminal CN2, one end of the second infrared emitting unit is connected to the third switching unit, and the other end is connected to the operating voltage. Specifically, the second infrared emitting unit includes multiple infrared emitting diodes; wherein, the anodes of the multiple infrared emitting diodes are all connected to the operating voltage, the cathodes are all connected to the first terminal of the third switching unit, and the second terminal of the third switching unit is grounded, that is, the controller controls the conduction or deactivation of the multiple infrared emitting diodes in the second infrared emitting unit through the first pin of terminal CN2.

[0032] Preferably, the first infrared emitting unit has three infrared emitting tubes arranged radially, depending on the actual scenario. Since the upper human detection component is positioned relatively high, approximately 1.2m, the effective range of human detection can be larger. Furniture such as sofas and coffee tables next to the air conditioner are relatively low, preventing false detection of furniture. The second infrared emitting unit has two infrared emitting tubes arranged vertically. Since the lower human detection component is positioned approximately 0.8m, the effective range of human detection can be smaller to prevent nearby sofas or coffee tables from being mistakenly identified as children, causing the air conditioner's middle and lower air vents to close incorrectly.

[0033] Preferably, the first infrared emitting diode driving module and the second infrared emitting diode driving module further include multiple adjusting resistors; wherein, in the first infrared emitting diode driving module, the anode of each infrared emitting diode is connected to the first terminal of the first switching unit through two parallel adjusting resistors, that is, in the first infrared emitting diode driving module, two parallel adjusting resistors are also provided between the anode of each infrared emitting diode and the first terminal of the first switching unit; similarly, in the second infrared emitting diode driving module, the anode of each infrared emitting diode is connected to the working voltage through two parallel adjusting resistors. This method of setting parallel adjusting resistors in the circuit allows for flexible adjustment of the resistance value, thereby adjusting the emission distance of the infrared emitting diode and the range of infrared light coverage. Based on this, the infrared light coverage range of the upper and lower human detection component detection circuits can also be adjusted by adjusting the infrared light coverage range of each infrared emitting diode, thereby achieving adjustment of the detection range, avoiding the inability to detect parts of the range, and improving detection accuracy.

[0034] Furthermore, the aforementioned first infrared light receiving module is used to receive infrared light and includes a first receiving unit and a first power supply filtering unit. The first pin of the first receiving unit is connected to the fourth pin of terminal CN1, the second pin of the first receiving unit is grounded via the first power supply filtering unit, and the third pin of the first receiving unit is connected to the operating voltage via the first power supply filtering unit. Specifically, when the first receiving unit receives infrared light returned by a human body or object within the detection range, it outputs a low level through its first pin. The controller receives this low level through the fourth pin of terminal CN1 and determines that a human body or object is present in front of the air conditioner's air outlet based on the low level. Conversely, if the controller receives a high level, it determines that no human body or object is present in front of the air conditioner's air outlet. Therefore, the controller can determine whether a human body or object is present in front of the air conditioner's air outlet based on the level signal sent by the first infrared light receiving module.

[0035] Similarly, the second infrared light receiving module includes a second receiving unit and a second power supply filtering unit; the first pin of the second receiving unit is connected to the third pin of terminal CN2, the second pin of the second receiving unit is grounded through the second power supply filtering unit, and the third pin of the second receiving unit is connected to the operating voltage through the second power supply filtering unit; the specific working principle of the second infrared light receiving module can be referred to the first infrared light receiving module described above, and will not be described in detail here.

[0036] Optionally, the first infrared light receiving module further includes a first anti-interference resistor and a first pull-up resistor; wherein, one end of the first anti-interference resistor is connected to the first pin of the first receiving unit, and the other end is connected to the fourth pin of terminal CN1; one end of the first pull-up resistor is connected to the operating voltage, and the other end is connected to both the first anti-interference resistor and the first pin of the first receiving unit. Specifically, the first anti-interference resistor is used to prevent static electricity and interference signals, improving the accuracy of the level signal sent by the first receiving unit to the controller; the first pull-up resistor is used to ensure that when the first receiving unit does not receive infrared light, the level state of the first pin of the first receiving unit is stable at the operating voltage.

[0037] Similarly, the second infrared light receiving module also includes a second anti-interference resistor and a second pull-up resistor; wherein, one end of the second anti-interference resistor is connected to the first pin of the second receiving unit, and the other end is connected to the third pin of terminal CN2; one end of the second pull-up resistor is connected to the operating voltage, and the other end is connected to both the second anti-interference resistor and the first pin of the second receiving unit. The functions of the second anti-interference resistor and the second pull-up resistor are the same as those of the first anti-interference resistor and the first pull-up resistor described above, and will not be elaborated further in this embodiment of the invention.

[0038] Furthermore, the first power supply filtering unit includes multiple parallel filter capacitors and a first current-limiting resistor. The second and third pins of the first receiving unit are respectively connected to the two ends of the filter capacitors in the first power supply filtering unit. The second pin of the first receiving unit is grounded, and the third pin is connected to the operating voltage through the first current-limiting resistor. Specifically, the multiple parallel filter capacitors in the first power supply filtering unit provide a stable power supply voltage to the first receiving unit and also serve a filtering function, thereby making the infrared signal received by the first receiving unit more stable and improving detection accuracy. The first current-limiting resistor serves to limit the current.

[0039] Similarly, the second power supply filtering unit includes multiple parallel filter capacitors and a second current-limiting resistor. The second and third pins of the second receiving unit are respectively connected to the two ends of the filter capacitors in the second power supply filtering unit. The second pin of the second receiving unit is grounded, and the third pin is connected to the operating voltage through the second current-limiting resistor. Specifically, the multiple parallel filter capacitors in the second power supply filtering unit provide a stable power supply voltage to the second receiving unit and also serve a filtering function, thereby making the infrared signal received by the second receiving unit more stable and improving detection accuracy. The second current-limiting resistor serves to limit the current.

[0040] Furthermore, the first power supply filtering module includes multiple filter capacitors; these capacitors are connected in parallel, with one end connected to the operating voltage and the fifth pin of terminal CN1, and the other end grounded. The capacitance values ​​of the multiple filter capacitors in the first power supply filtering module are different to meet filtering requirements for different frequency bands. In addition, since the connection line from the upper human sensor detection circuit to the controller is relatively long, signal coupling is inevitable. Therefore, the first power supply filtering module can further improve the filtering effect, resulting in better electromagnetic compatibility (EMC) performance.

[0041] Similarly, the second power supply filtering module includes multiple filter capacitors; these capacitors are connected in parallel, with one end connected to the operating voltage and the fourth pin of terminal CN2, and the other end grounded. The capacitance values ​​of the multiple filter capacitors in the second power supply filtering module are different to meet filtering requirements for different frequency bands. Furthermore, since the connection line from the lower human sensor detection circuit to the controller is relatively long, signal coupling is inevitable. Therefore, the second power supply filtering module can further improve the filtering effect, resulting in better electromagnetic compatibility.

[0042] In summary, the multifunctional circuit provided in this embodiment of the invention can identify people and objects that suddenly appear in front of the air outlet. This multifunctional circuit mainly includes an upper human detection component circuit and a lower human detection component circuit. Through the combined use of the upper human detection component circuit and the lower human detection component circuit, the triple functions of intelligent human detection, sliding door detection, and child anti-pinch protection can be realized.

[0043] Both the upper and lower human detection circuits include an infrared emitting diode driver module for emitting infrared light, an infrared light receiving module for receiving infrared light, and a power supply filter module for powering the controller. The controllers made from these upper and lower human detection circuits (hereinafter referred to as the upper and lower human detection circuits) are installed at the air outlet. In practical applications, the upper human detection circuit emits infrared light, which is reflected back after hitting a person in front of it. The infrared light receiving module receives the infrared light and outputs a low-level signal. The microcontroller unit (MCU) receives this low-level signal and determines that a person or object is in front of the air conditioner. If no reflected light is received, the low-level signal is not received, and the absence of a person or object is determined. Similarly, the lower human detection circuit operates on the same principle as the upper human detection circuit, and will not be described in detail here. It should be noted that the aforementioned MCU can also be called a controller.

[0044] In addition, the upper and lower human-sensing components are installed at different heights and can respectively identify people or objects appearing in front of the air conditioner. At the same time, based on the infrared signals fed back by the upper and lower human-sensing components, the controller can also identify whether it is an adult or a child. If it is determined to be an adult, the upper, middle and lower air guides of the air conditioner will be fully closed. If it is a child, the middle and lower air guides will be closed.

[0045] Therefore, the above-mentioned multifunctional circuit can not only realize multiple functions, but also reliably control the emission distance and effective range of infrared light. It also has the advantages of low power consumption, stable infrared receiving signal, high circuit reliability, good filtering effect and EMC effect, and low cost, making it easy to promote and implement in practical applications.

[0046] like Figure 1 The schematic diagram of the multifunctional circuit shown includes an upper human sensor detection circuit and a lower human sensor detection circuit. The upper human sensor detection circuit is connected to the controller via terminal CN1, and the lower human sensor detection circuit is connected to the controller via terminal CN2. The upper human sensor detection circuit includes a first infrared emitting diode driving module 11, a first infrared light receiving module 12, and a first power supply filtering module 13. The lower human sensor detection circuit includes a second infrared emitting diode driving module 21, a second infrared light receiving module 22, and a second power supply filtering module 23. Therefore, the structures of the upper and lower human sensor detection circuits are not completely identical.

[0047] Specifically, the upper human sensor detection circuit uses three infrared emitters and one receiver, with the three infrared emitters arranged radially; the lower human sensor detection circuit uses two infrared emitters and one receiver, with the two infrared emitters arranged vertically. The receiver can also be placed between the two infrared emitters.

[0048] In practical applications, because the human detection component is installed at a relatively high position, approximately 1.2m, the effective detection range can be designed to be larger. However, considering that furniture such as sofas and coffee tables next to the air conditioner are relatively low and generally not detected, therefore... Figure 2 As shown, the three infrared emitters can be arranged radially. Similarly, because the lower human detection component's installation position is low, approximately 0.8m high, the effective detection range is designed to be relatively small to avoid detecting nearby furniture such as sofas or coffee tables and mistakenly identifying them as children, causing the middle and lower air vents to close. Therefore, as... Figure 3 As shown, the two infrared emitters are arranged vertically.

[0049] Based on the above Figure 1 The working principle of the above-mentioned human-sensing component detection circuit is explained as follows:

[0050] (1) The first infrared emitting tube driving module 11 is used to control the conduction or non-conduction of the anode and cathode of the infrared emitting tube through two IO ports respectively, thereby controlling whether the three infrared emitting tubes (IR1, IR2, IR3) emit infrared light.

[0051] Specifically, such as Figure 1 As shown, the first infrared emitting diode is IR1, the second infrared emitting diode is IR2, and the third infrared emitting diode is IR3. The first switching unit includes the first transistor Q1, the second transistor Q2, and the third transistor Q3. The second switching unit includes the fourth transistor Q4 and the fifth transistor Q5. The operating voltage is 5V.

[0052] Specifically, pin 1 of terminal CN1 is connected to the control terminal of Q1 through resistor R4. The first terminal of Q1 is connected to the control terminal of Q2 through resistor R7. The second terminal of Q1 is grounded and connected to one end of resistor R6. The other end of resistor R6 is connected to resistor R4 and the control terminal of Q1. The first terminal of Q2 is connected to resistors R10, R11, R12, and R13. The second terminal of Q2 is connected to the operating voltage 5V and one end of resistor R8. The other end of resistor R8 is connected to resistor R7 and the control terminal of Q2. Additionally, pin 1 of terminal CN1 is also connected to the control terminal of Q3 through resistor R5. The first terminal of Q3 is connected to resistors R14 and R15. The second terminal of Q3 is connected to the operating voltage 5V and one end of resistor R9. The other end of resistor R9 is connected to resistor R5 and the control terminal of Q3.

[0053] In addition, pin 2 of terminal CN1 is connected to the control terminal of Q4 through resistor R16. The first end of Q4 is connected to the cathode of IR2, the second end of Q4 is grounded and connected to one end of resistor R17, and the other end of resistor R17 is connected to the control terminals of resistor R16 and Q4 respectively. Pin 2 of terminal CN1 is connected to the control terminal of Q5 through resistor R18. The first end of Q5 is connected to the cathodes of IR3 and IR1 respectively, the second end of Q5 is grounded and connected to one end of resistor R19, and the other end of resistor R19 is connected to the control terminals of resistor R18 and Q5 respectively.

[0054] Optionally, the resistance of R4 is 2kΩ, the resistance of R5 is 2kΩ, the resistance of R6 is 5.1kΩ, the resistance of R7 is 2kΩ, the resistance of R8 is 5.1kΩ, the resistance of R9 is 5.1kΩ, the resistance of R10 is 51Ω, the resistance of R11 is 220Ω, the resistance of R12 is 220Ω, the resistance of R13 is 51Ω, the resistance of R14 is 100Ω, the resistance of R15 is 100Ω, the resistance of R16 is 1kΩ, the resistance of R17 is 100kΩ, the resistance of R18 is 1kΩ, and the resistance of R19 is 100kΩ.

[0055] Terminal CN1 connects to the main control board (i.e., the controller), pin 1 (i.e., the anode control port) controls the conduction of the anodes of the three infrared emitting diodes (IR1, IR2 and IR3), and pin 2 (i.e., the cathode control port) controls the conduction of the cathodes of the three infrared emitting diodes (IR1, IR2 and IR3).

[0056] When pin 1 outputs a high level of 5V, transistors Q1 and Q2 are turned on, while Q3 is not turned on. Thus, 5V is supplied to the anodes of infrared emitting diodes IR1 and IR2 simultaneously through resistors R10, R11, R12, and R13. Since Q3 is not turned on, the anode of infrared emitting diode IR3 is not energized.

[0057] When pin 1 outputs a low level of 0V, transistors Q1 and Q2 are not conducting, while Q3 is conducting. As a result, 5V is supplied to the anode of infrared emitting diode IR3 through resistors R14 and R15. Since Q1 and Q2 are not conducting, the anodes of infrared emitting diodes IR1 and IR2 are not energized at the same time.

[0058] Therefore, when pin 1 (i.e., the anode control port) outputs a high or low level, the three infrared emitters are divided into two groups and turned on separately. That is, IR1 and IR2 are one group (installed on both sides), and IR3 is the other group (installed in the middle). When these two groups are powered on or off, the area covered by the emitted infrared light appears alternately, similar to a region scanning method. This method has low power consumption. If the three infrared emitters are always turned on, the power consumption is high. Thus, through the circuit design of grouping the infrared emitters as described above, not only can the coverage range of the infrared light be guaranteed, but the power consumption can also be reduced.

[0059] When pin 2 outputs a high level of 5V, transistors Q4 and Q5 are turned on, and the cathodes of the three infrared emitting diodes (IR1, IR2 and IR3) are connected to ground. At this time, when pin 1 is high, IR1 and IR2 are turned on and emit infrared light; conversely, when pin 1 is low, IR3 is turned on and also emits infrared light.

[0060] When pin 2 outputs a low level (0V), transistors Q4 and Q5 are not conducting. At this time, the cathodes of the three infrared emitters (IR1, IR2, and IR3) are not connected to ground, and the infrared emitters cannot emit infrared light. Therefore, pin 2 (the cathode control port) controls whether the three infrared emitters can emit infrared light, while pin 1 (the anode control port) controls which group of infrared emitters emits light. In practical applications, the coverage area of ​​the infrared light emitted by each group of infrared emitters is not exactly the same and can be changed according to the installation position; that is, IR1 and IR2 are placed on the outermost side, and IR3 is placed in the middle.

[0061] In addition, in the above circuit, multiple regulating resistors are connected in parallel, such as R10 and R11 in parallel, R12 and R13 in parallel, and R14 and R15 in parallel. This circuit method of connecting regulating resistors in parallel can adjust the distance at which the infrared emitter emits light and the range of infrared light coverage by adjusting the resistance value.

[0062] (2) First infrared light receiving module 12; including a first receiving unit, namely a first infrared receiving head REC1, a first anti-interference resistor R1, a first pull-up resistor R2 and a first power supply filtering unit; wherein, the first power supply filtering unit includes multiple parallel filter capacitors (C5, C6 and C7) and a first current limiting resistor R3;

[0063] The first infrared receiver REC1 receives infrared light, and its Out pin (i.e., the first pin of the first receiving unit) outputs a low level. This causes pin 4 of terminal CN1 to also be at a low level. When the controller detects the low level, it determines that infrared light has been reflected back, thus indicating the presence of a human or object in front of the air conditioner vent. If the controller detects a high level, it determines that no human or object exists. The carrier frequency of the first infrared receiver REC1 is 56.7kHz. Therefore, the frequency of the PWM (Pulse Width Modulation) control signal emitted from pin 2 of terminal CN1 (i.e., the cathode control port) is also 56.7kHz to ensure that the first infrared receiver REC1 can reliably receive signals.

[0064] In addition, R2 serves as the first pull-up resistor to ensure that the voltage level of the first infrared receiver REC1 remains stable at 5V when it is not receiving infrared light; the first anti-interference resistor R1 is used to prevent static electricity and interference signals; R3 is the first current-limiting resistor, used for current limiting; capacitors C5, C6, and C7 are used to provide a stable power supply voltage to the first infrared receiver REC1 and also serve as filters. Optionally, the resistance of R1 is 330Ω, the resistance of R2 is 10kΩ, the resistance of R3 is 100Ω, and the capacitance values ​​of capacitors C5, C6, and C7 are 475, 104, and 102, respectively. Here, a 475 capacitor is chosen for C5. The capacitance value cannot be too small, otherwise the voltage regulation and filtering effects will be worse, which may cause the ripple test to fail. In addition, the capacitance value does not need to be too large due to space constraints and increased cost, so 475 is chosen.

[0065] (3) The first power supply filtering module 13 includes filter capacitors C1, C2, C3 and C4; the capacitance values ​​are selected as 102, 101, 103 and 104 respectively, which can meet the filtering effect of different frequency bands. Because the connection line from the human sensor component detection circuit to the controller is long, the signal is inevitably coupled. Therefore, this filtering circuit can improve the filtering effect and make the EMC effect better.

[0066] Similarly, the working principle of the human sensor component detection circuit is the same for the second infrared light receiving module 22 and the first infrared light receiving module 12, and the second power supply filtering module 23 and the first power supply filtering module 13. These details will not be elaborated further in this embodiment. Only the working principle of the second infrared emitting tube driving module 21, which differs from the first infrared emitting tube driving module 11, will be described here.

[0067] Specifically, the second infrared emitting diode driver module 21 is used to control the conduction or deconduction of the cathode of the infrared emitting diode through an IO port, thereby controlling whether the two infrared emitting diodes (IR4, IR5) emit infrared light. Figure 1As shown, the second infrared emitting unit includes a fourth infrared emitting tube IR4 and a fifth infrared emitting tube IR5, and the third switching unit includes a sixth transistor Q6 with an operating voltage of 5V.

[0068] Specifically, pin 1 of terminal CN2 is connected to the control terminal of Q6 via resistor R27. The first end of Q6 is connected to the cathodes of IR4 and IR5 respectively. The second end of Q6 is grounded and connected to one end of resistor R28 respectively. The other end of resistor R28 is connected to the control terminals of resistor R27 and Q6 respectively. Furthermore, the anode of IR4 is connected to the operating voltage of 5V via resistors R23 and R24, and the anode of IR5 is connected to the operating voltage of 5V via resistors R25 and R26.

[0069] Optionally, the resistance of R27 is 1kΩ, the resistance of R28 is 100kΩ, the resistance of R23 is 100Ω, the resistance of R24 is 100Ω, the resistance of R25 is 100Ω, and the resistance of R26 is 100Ω.

[0070] Terminal CN2 connects to the main control board (i.e., the controller), and pin 1 (i.e., the cathode control port) controls the conduction of the cathodes of the two infrared emitting tubes (IR4, IR5).

[0071] When pin 1 outputs a high level of 5V, transistor Q7 is turned on, so that 5V passes through resistors R23, R24, R25 and R26 and then through infrared emitting diodes IR4 and IR5 to the bottom, and IR4 and IR5 emit infrared light.

[0072] When pin 1 outputs a low level of 0V, transistor Q7 is not turned on, and IR4 and IR5 do not emit infrared light.

[0073] In practical applications, the lower human sensor detection circuit design only has two infrared emitters. This is because the lower human sensor detection circuit is located at a low position, approximately 0.8m in height. The effective range of human detection needs to be smaller to avoid detecting nearby sofas or coffee tables and mistakenly identifying them as children, which would cause the middle and lower air deflectors to close.

[0074] In addition, in the aforementioned human sensing component detection circuit, multiple adjusting resistors are connected in parallel, such as R23 and R24 in parallel, and R25 and R26 in parallel. This circuit method of parallel adjusting resistors can adjust the distance of the infrared emitting tube and the range of infrared light coverage by adjusting the resistance value.

[0075] In summary, based on the aforementioned multifunctional circuit, intelligent human detection functionality can be achieved. For example... Figure 4As shown, the specific principle is as follows: The main control board MCU sends a human detection command to the display board MCU. After receiving the human detection command, the display board MCU drives the infrared emitters in the upper and lower human detection modules to emit infrared light, and acquires the upper human detection signal returned by the upper human detection module (i.e., the upper human detection module or the upper human detection module detection circuit) and the lower human detection signal returned by the lower human detection module (i.e., the lower human detection module or the lower human detection module detection circuit). The display MCU then sends the upper and lower human detection signals to the main control board MCU, so that the main control board MCU... The CU analyzes the upper and lower human presence signals. If only the lower human presence signal is detected, it controls the middle and lower air guide motors to close the middle and lower air guide panels. If both upper and lower human presence signals are detected simultaneously, it controls the upper, middle, and lower air guide motors to close the upper, middle, and lower air guide panels. This achieves intelligent detection of people in front of the air conditioner and adjusts the corresponding operating status. When a child approaches, the middle and lower air guide panels are closed; when an adult approaches, the upper, middle, and lower air guide panels are closed. Cooling or heating air is only blown out from the small holes on the air guide panels, thus activating the gentle breeze function and ensuring user comfort.

[0076] Furthermore, regarding the child-proof finger-pinching function, such as Figure 5 As shown, the specific principle is as follows: The main control board MCU sends a human detection command to the display board MCU. After receiving the human detection command, the display board MCU drives the infrared emitter in the lower human detection component detection circuit to emit infrared light and obtains the lower human detection signal returned by the lower human detection module (i.e., the lower human detection component or the lower human detection component detection circuit). The display MCU sends the lower human detection signal to the main control board MCU so that the main control board MCU can analyze the lower human detection signal. For example, when the lower human detection signal is detected, the middle and lower air guide motors are controlled to close the upper, middle and lower air guide doors. That is, when a child approaches the air conditioner, the middle and lower air guide doors are closed to prevent the child from inserting thin objects such as pencils or chopsticks into the air guide doors and damaging the fan blades.

[0077] Furthermore, for the sliding door detection function, based on the aforementioned multi-functional circuit, a sliding door is positioned directly in front of the upper and lower human sensing components. Therefore, the sliding door is detected by the multi-functional circuit after the air conditioner is turned on and off.

[0078] Specifically, such as Figure 6 As shown, the detection of sliding doors can be mainly divided into the following situations:

[0079] ①State 1: After power-on, before the sliding door moves, both the upper and lower human detection modules (i.e., the upper and lower human detection component detection circuits) perform a detection. If the upper and lower human detection modules detect the infrared light signal returned by the sliding door, it indicates that the sliding door is closed normally, the sliding door motor is normal, and no one has manually moved the sliding door. That is, when the air conditioner is powered on, the main control MCU sends a human detection command to the display board MCU. After receiving the human detection command, the display board MCU drives the infrared emitters in the upper and lower human detection component detection circuits to emit infrared light, and obtains the upper human detection signal returned by the upper human detection module and the lower human detection signal returned by the lower human detection module. The display MCU then sends the upper and lower human detection signals to the main control board MCU so that the main control board MCU can analyze the upper and lower human detection signals. If both the upper and lower human detection signals are infrared light signals, it indicates that the sliding door is closed normally, the sliding door motor is normal, and no one has manually moved the sliding door.

[0080] ②State 2: After power-on, before the sliding door moves, both the upper and lower human detection modules will perform a check. If neither the upper nor lower human detection module detects the sliding door signal, it indicates that the sliding door is not properly closed. This may be due to a faulty sliding door motor or human intervention. In this case, the air conditioner will continue to open according to the sliding-open logic. That is, if either the upper or lower human detection signal fails to detect the infrared light signal, it indicates that the sliding door is not properly closed. In this case, the air conditioner will continue to open according to the sliding-open logic.

[0081] ③State 3: After the unit is turned off, the sliding door moves, and both the upper and lower human detection modules perform a check. If both modules detect the sliding door signal, it indicates that the sliding door is closed normally and the sliding door motor is functioning correctly. If either the upper or lower human detection module fails to detect the sliding door signal, it indicates that the sliding door motor is faulty and an abnormality has occurred. In this case, a fault code is displayed. That is, when the air conditioner is turned off, the main control MCU sends a human detection command to the display board MCU. After receiving the human detection command, the display board MCU drives the detection circuits of the upper and lower human detection components respectively. The infrared emitter in the circuit emits infrared light and acquires the upper and lower human detection signals returned by the upper and lower human detection modules. The display MCU then sends these signals to the main control board MCU, which analyzes them. If both signals are infrared, the sliding door is closed correctly and the motor is functioning properly. If no infrared signal is detected, the sliding door motor is faulty, and the main control board MCU generates a corresponding fault code, which is displayed on the display panel.

[0082] ④ State 4: After power-on, before the sliding door moves, both the upper and lower human detection modules perform a check. One or two of the upper and lower human detection modules do not detect the infrared light signal reflected by the sliding door. However, after power-off, after the sliding door moves, both the upper and lower human detection modules detect the infrared light signal reflected by the sliding door. This indicates that the sliding door is closed normally and the sliding door motor is not abnormal. The detection of the human detection signal before the sliding door moves after power-on is caused by the sliding door being manually moved. In this scenario, the main control board MCU does not need to generate the corresponding fault code, that is, the display board does not need to display fault information.

[0083] Therefore, the aforementioned multifunctional circuit can detect whether the sliding door of the cabinet air conditioner is closed in place, thereby automatically determining whether the sliding door was manually opened or the sliding door motor is damaged. If the sliding door was manually opened, the air conditioner can automatically adjust to the correct position after detection, and the main control board does not need to report a fault. If the sliding door motor is damaged, the main control board generates fault information to remind the user that the sliding door motor is abnormal and reports an after-sales fault.

[0084] In summary, the multifunctional circuit provided in this embodiment of the invention has the following advantages: (1) This circuit can identify people and objects suddenly appearing in front of the air outlet. It mainly includes an upper human detection component circuit and a lower human detection component circuit. Through the cooperation of the upper and lower human detection component circuits, it realizes the triple functions of intelligent human detection, sliding door detection, and child anti-pinch. (2) The upper and lower human detection component circuits are designed according to the actual scene and both include an infrared emitting tube driving circuit, an infrared light receiving circuit, and a power supply filtering circuit. Each circuit not only It can reliably control the emission distance and effective range of infrared light, and the infrared receiving signal is stable and reliable. The circuit is simple, the filtering effect is good, and the EMC effect is very good. (3) In the circuit design, R10 and R11 are connected in parallel, R12 and R13 are connected in parallel, R14 and R15 are connected in parallel, R23 and R24 are connected in parallel, and R25 and R26 are connected in parallel. This circuit design method can flexibly adjust the resistance value, thereby adjusting the distance of the infrared emitting tube and the range of infrared light coverage. By connecting pull-up resistors R2 and R21 to 5V, connecting R1 and R20 to prevent interference and static electricity, and then connecting current limiting resistors. Resistors R3, R22 and filter capacitors C5, C6, C7, C12, C13, C14 ensure stable power supply for the infrared receiver head and stable infrared signal reception; (4) The power supply filtering circuit uses surface-mount inductors with capacitors 101, 102, 103, and 104 for filtering. In this invention, all four types of capacitors are present and indispensable to ensure that when the infrared transmitter is coupled to interference, the filtering effect of different frequency bands can reach the best, reliable filtering, and excellent EMC effect; (5) The three infrared emitting tubes in the upper human sensor component detection circuit are arranged radially, and the lower human sensor component detection circuit is arranged radially. Two infrared emitters are set vertically in the middle of the road; (6) It can detect whether the sliding door of the cabinet air conditioner is closed in place, so as to automatically determine whether it is caused by human to pry open the sliding door or the sliding door motor is damaged. If it is caused by human to pry open the sliding door, the air conditioner can adjust itself in place after detection and will not report a fault. If it is determined that the motor is damaged, it will report an after-sales fault and remind that the sliding door motor is abnormal; (7) It realizes the child anti-pinch function. When the child approaches, the lower human sensing component detects the human sensing signal and the middle and lower air guide door closes to prevent the child from inserting thin objects such as pencils or chopsticks into the air guide door and causing damage to the fan blades.

[0085] Based on the above-mentioned multifunctional circuit, this embodiment of the invention also provides an indoor unit, which is equipped with the above-mentioned multifunctional circuit; wherein, the multifunctional circuit includes an upper human detection component detection circuit and a lower human detection component detection circuit.

[0086] Furthermore, this embodiment of the invention also provides an air conditioner, which includes the above-mentioned indoor unit and a controller; wherein the controller is connected to the upper human detection component detection circuit through terminal CN1 and to the lower human detection component detection circuit through terminal CN2.

[0087] Specifically, the controller is also used to control the upper and lower human detection circuits to emit infrared light, acquire the first infrared signal fed back by the upper and lower human detection circuits, and implement corresponding functions based on the first and second infrared signals; wherein the functions include at least one of the following: intelligent human detection function, sliding door detection function, and child anti-pinch function. The specific implementation process can be referred to the above-described multi-functional circuit, and will not be described in detail here.

[0088] It should be noted that the above-mentioned air conditioner includes an outdoor unit in addition to the indoor unit. The specific structure of the indoor and outdoor units can be referred to existing air conditioners. The embodiments of the present invention will not be described in detail here.

[0089] Of course, those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by computer-controlled devices. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the above method embodiments. The storage medium can be a memory, a disk, an optical disk, etc.

[0090] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0091] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0092] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A multifunctional circuit, characterized in that, The circuit includes: an upper human sensor component detection circuit and a lower human sensor component detection circuit; wherein, the upper human sensor component detection circuit is connected to the controller via terminal CN1, and the lower human sensor component detection circuit is connected to the controller via terminal CN2; The human detection component includes: a first infrared emitting tube driving module, a first infrared light receiving module, and a first power supply filtering module; wherein, the first infrared emitting tube driving module includes: a first switching unit, a first infrared emitting unit, and a second switching unit; the control terminal of the first switching unit is connected to the first pin of the terminal CN1, the control terminal of the second switching unit is connected to the second pin of the terminal CN1, and the first switching unit, the first infrared emitting unit, and the second switching unit are connected in sequence; the first infrared light receiving module includes a first receiving unit and a first power supply filtering unit; the first pin of the first receiving unit is connected to the fourth pin of the terminal CN1, the second pin of the first receiving unit is grounded through the first power supply filtering unit, and the third pin of the first receiving unit is connected to the operating voltage through the first power supply filtering unit; the first power supply filtering module includes multiple filtering capacitors; the multiple filtering capacitors are connected in parallel, and one end is connected to the operating voltage and the fifth pin of the terminal CN1 respectively, and the other end is grounded; The human detection component circuit includes: a second infrared emitting diode driving module, a second infrared light receiving module, and a second power supply filtering module; wherein, the second infrared emitting diode driving module includes: a second infrared emitting unit and a third switching unit; the control terminal of the third switching unit is connected to the first pin of the terminal CN2, one end of the second infrared emitting unit is connected to the third switching unit, and the other end is connected to the operating voltage; the second infrared light receiving module includes a second receiving unit and a second power supply filtering unit; the first pin of the second receiving unit is connected to the third pin of the terminal CN2, the second pin of the second receiving unit is grounded through the second power supply filtering unit, and the third pin of the second receiving unit is connected to the operating voltage through the second power supply filtering unit; the second power supply filtering module includes multiple filtering capacitors; the multiple filtering capacitors are connected in parallel, and one end is connected to the operating voltage and the fourth pin of the terminal CN2 respectively, and the other end is grounded.

2. The multifunctional circuit according to claim 1, characterized in that, The first infrared emitting unit includes a plurality of infrared emitting tubes; wherein, the anodes of the plurality of infrared emitting tubes are all connected to the first terminal of the first switching unit, the cathodes are all connected to the first terminal of the second switching unit, the second terminal of the first switching unit is connected to the operating voltage, and the second terminal of the second switching unit is grounded; The second infrared emitting unit includes multiple infrared emitting tubes; wherein the anodes of the multiple infrared emitting tubes are all connected to the operating voltage, the cathodes are all connected to the first terminal of the third switching unit, and the second terminal of the third switching unit is grounded.

3. The multifunctional circuit according to claim 2, characterized in that, The first infrared emitting unit contains three infrared emitting tubes, which are arranged radially. The second infrared emitting unit has two infrared emitting tubes, which are arranged vertically.

4. The multifunctional circuit according to claim 2, characterized in that, The first infrared emitting diode driving module and the second infrared emitting diode driving module each include a plurality of regulating resistors; wherein, in the first infrared emitting diode driving module, the anode of each infrared emitting diode is connected to the first terminal of the first switching unit through two regulating resistors connected in parallel; and in the second infrared emitting diode driving module, the anode of each infrared emitting diode is connected to the operating voltage through two regulating resistors connected in parallel.

5. The multifunctional circuit according to claim 1, characterized in that, The first infrared light receiving module further includes a first anti-interference resistor and a first pull-up resistor; wherein, one end of the first anti-interference resistor is connected to the first pin of the first receiving unit, and the other end is connected to the fourth pin of the terminal CN1; one end of the first pull-up resistor is connected to the operating voltage, and the other end is connected to the first anti-interference resistor and the first pin of the first receiving unit respectively.

6. The multifunctional circuit according to claim 1, characterized in that, The second infrared light receiving module further includes a second anti-interference resistor and a second pull-up resistor; wherein, one end of the second anti-interference resistor is connected to the first pin of the second receiving unit, and the other end is connected to the third pin of the terminal CN2; one end of the second pull-up resistor is connected to the operating voltage, and the other end is connected to the second anti-interference resistor and the first pin of the second receiving unit respectively.

7. The multifunctional circuit according to claim 1, characterized in that, The first power supply filtering unit includes multiple parallel filter capacitors and a first current limiting resistor; wherein, the second pin and the third pin of the first receiving unit are respectively connected to the two ends of the filter capacitor of the first power supply filtering unit, and the second pin of the first receiving unit is grounded, and the third pin is connected to the operating voltage through the first current limiting resistor; The second power supply filtering unit includes multiple parallel filter capacitors and a second current-limiting resistor; wherein, the second pin and the third pin of the second receiving unit are respectively connected to the two ends of the filter capacitor of the second power supply filtering unit, and the second pin of the second receiving unit is grounded, and the third pin is connected to the operating voltage through the second current-limiting resistor.

8. An indoor unit, characterized in that, The indoor unit is equipped with a multi-functional circuit as described in any one of claims 1-7; wherein the multi-functional circuit includes an upper human detection component detection circuit and a lower human detection component detection circuit.

9. An air conditioner, characterized in that, The air conditioner includes the indoor unit as described in claim 8, and a controller; wherein the controller is connected to the upper human sensor component detection circuit via terminal CN1 and to the lower human sensor component detection circuit via terminal CN2.

10. The air conditioner according to claim 9, characterized in that, The controller is further configured to control the upper human detection component circuit and the lower human detection component circuit to emit infrared light, and to acquire the first infrared signal fed back by the upper human detection component circuit and the second infrared signal fed back by the lower human detection component circuit, and to implement corresponding functions based on the first infrared signal and the second infrared signal; wherein, the functions include at least one of the following: intelligent human detection function, sliding door detection function, and child anti-pinch function.

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