Driving circuit of intelligent human sensing function, indoor unit of air conditioner and air conditioner

Abstract

The application provides a drive circuit of intelligent human sensing function, an indoor unit of an air conditioner and the air conditioner. The drive circuit of intelligent human sensing function comprises a filter circuit, an infrared light emitting circuit and an infrared light receiving circuit. The filter circuit comprises a filter inductor and a plurality of filter capacitors. The infrared light emitting circuit comprises a switching element, a limiting resistor and a plurality of infrared emitting tubes. Each infrared emitting tube is connected with at least one limiting resistor, and the infrared emitting tube and the corresponding limiting resistor are connected in series between a working voltage and the ground. The infrared light receiving circuit comprises a filtering unit, a pull-up resistor and at least one infrared receiving head. The embodiment of the application can improve the accuracy of identifying whether there is a person or an object at the air outlet, has a simple circuit structure, low cost, stable and reliable signal and good EMC effect.

Description

Technical Field

[0001] This invention relates to the field of intelligent air supply technology, and more specifically, to a driving circuit for intelligent human sensing function, an indoor unit of an air conditioner, and an air conditioner. Background Technology

[0002] Most existing cabinet air conditioners lack intelligent human detection functionality. This intelligent human detection function means that during normal airflow, if the area in front of the air conditioner's vent is obstructed, the controller can detect the obstruction signal, indicating that there is a person or object in that area. The air conditioner then closes the lower-level air deflector, and the air is blown out through multiple small holes on the deflector, creating a draftless airflow. This prevents cooling or heating air from blowing directly on the user, improving comfort and preventing illnesses such as colds caused by direct airflow from the air conditioner vent.

[0003] Most existing air conditioners lack intelligent human detection functions, and a small number rely on radar for identification. However, radar is expensive, resulting in high identification costs. Summary of the Invention

[0004] This invention addresses the problem that existing air conditioners either lack intelligent human sensing functionality or have high recognition costs.

[0005] To address the aforementioned problems, this invention provides a driving circuit for an intelligent human sensing function, comprising a filtering circuit, an infrared light emitting circuit, and an infrared light receiving circuit. The filtering circuit includes a filtering inductor and multiple filtering capacitors. The multiple filtering capacitors are connected in parallel, with a first terminal grounded and a second terminal connected to the operating voltage and then connected to a first pin of an air conditioner via the filtering inductor; alternatively, the second terminal is connected to the operating voltage and then to the first pin via the filtering inductor. The infrared light emitting circuit includes a switching element, a limiting resistor, and multiple infrared emitting diodes, each of which is connected to at least one limiting resistor. The infrared emitting diode and the corresponding limiting resistor are connected in series between the operating voltage and ground; the switching element is connected in series with the limiting resistor and / or the infrared emitting diode to control the connection and disconnection between the infrared emitting diode and the operating voltage and ground, and the control terminal of the switching element is connected to the second pin of the controller; the infrared light receiving circuit includes a filtering unit, a pull-up resistor and at least one infrared receiving head; the first pin of the infrared receiving head is connected to the third pin of the controller and is connected to the operating voltage through the pull-up resistor; the second pin of the infrared receiving head is grounded through the filtering unit, and the third pin of the infrared receiving head is connected to the operating voltage.

[0006] This embodiment can improve the accuracy of identifying whether there is a person or object at the air outlet. It has a simple circuit structure, low cost, stable and reliable signal, and good EMC performance.

[0007] Optionally, the infrared light emitting circuit includes a first switching element; the anode of the infrared emitting tube is connected to the operating voltage through multiple limiting resistors, the cathodes of all the infrared emitting tubes are connected to the first terminal of the first switching element, the second terminal of the first switching element is grounded, and the control terminal of the first switching element is connected to the second pin of the controller.

[0008] In this embodiment, one I / O port is used to control whether the cathode of the infrared emitting tube is turned on or off, thereby controlling whether the infrared emitting tube emits infrared light.

[0009] Optionally, the infrared light emitting circuit further includes a second switching element, which is disposed between the plurality of limiting resistors and the operating voltage; a first terminal of the second switching element is connected to the operating voltage, a second terminal of the second switching element is connected to all the limiting resistors, and a control terminal of the second switching element is connected to a third pin of the controller.

[0010] In this embodiment, a circuit design and structure that separately controls the anode and cathode of the infrared emitting tube can meet the detection range requirements of the air outlet, and the emission distance and coverage of the infrared light can be adjusted by limiting the resistor.

[0011] Optionally, the anode of the infrared emitting diode is connected to the operating voltage or the second terminal of the second switching element through at least two parallel limiting resistors.

[0012] In this embodiment, the emission power of each infrared emitting diode is adjusted by using parallel limiting resistors, thereby adjusting the emission distance and coverage of the infrared light.

[0013] Optionally, the filtering unit includes multiple parallel filtering capacitors and current-limiting resistors; the second and third pins of the infrared receiver are respectively connected to the two ends of the filtering capacitors, and the second pin of the infrared receiver is grounded, while the third pin is connected to the operating voltage through the current-limiting resistor.

[0014] In this embodiment, the filtering unit can provide a stable power supply voltage after filtering to the driving circuit.

[0015] Optionally, the infrared light receiving circuit further includes a protection resistor, and the first pin of the infrared receiver head is connected to the third pin of the controller through the protection resistor.

[0016] In this embodiment, the infrared light receiving circuit is equipped with a protective resistor to prevent static electricity and interference signals.

[0017] Optionally, the capacitance values ​​of the filter capacitors in the power supply filter circuit are different.

[0018] In this embodiment, by using multiple filter capacitors with different capacitance values, the filtering effect of different frequency bands can be optimized, meeting the requirements of reliable filtering and improving EMC performance.

[0019] Optionally, the number of infrared emitting tubes is three.

[0020] This embodiment provides the specific number of infrared emitters, taking into account both coverage and cost.

[0021] This invention provides an indoor unit for an air conditioner, including at least one drive circuit for the aforementioned intelligent human sensing function.

[0022] This invention provides an air conditioner, including the indoor unit described above.

[0023] The indoor unit and air conditioner provided by this invention can achieve the same technical effect as the driving circuit of the above-mentioned intelligent human sensing function. Attached Figure Description

[0024] Figure 1 A schematic diagram of a driving circuit for an intelligent human sensing function provided in an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of another intelligent human sensing function driving circuit provided in an embodiment of the present invention. Detailed Implementation

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] This invention provides a driving circuit for an intelligent human-sensing function, which includes a filtering circuit, an infrared light emitting circuit, and an infrared light receiving circuit. The emitted infrared light can cover the area in front of the air outlet to identify whether there is a person or object in front of the air outlet. A device made from this intelligent human-sensing function driving circuit can be installed at the air outlet of an indoor unit.

[0028] In human detection, infrared light is emitted first. When a person or object in front of the air outlet is illuminated, the infrared light is reflected. The reflected infrared light is received and outputs a low-level signal. The microcontroller unit (MCU) receives this low-level signal and determines that there is a person or object in front. If there is no reflected infrared light, there is no low-level signal, and therefore no person or object is detected. This circuit reliably controls the emission distance and effective range of the infrared light, provides stable and reliable infrared signal reception, has a simple circuit structure, good filtering effect, and good electromagnetic compatibility (EMC) performance.

[0029] Multiple devices can be installed at the air outlet. These devices work together to detect the presence of people or objects at different heights. Based on the results of these detections, the presence of a person or object at that height can be definitively determined, thus distinguishing their height, such as adults and children of different heights. Different air deflector control schemes are applied to different types of users. For example, if an adult is detected at the air outlet, the air deflector is kept open; if a child is detected, the air deflector is closed.

[0030] The driving circuit for the intelligent human sensing function provided in this embodiment of the invention includes a filtering circuit, an infrared light emitting circuit, and an infrared light receiving circuit.

[0031] The power supply filtering circuit supplies power to the drive circuit and includes a filter inductor and multiple filter capacitors. These multiple filter capacitors are connected in parallel, with their first parallel terminal grounded and their second parallel terminal connected to the operating voltage and then connected to the first pin of the air conditioner via the filter inductor; alternatively, the second terminal is connected to the operating voltage and then connected to the first pin via the filter inductor. This embodiment employs the above-mentioned capacitor-inductor filtering method, which can meet the filtering requirements of different frequency bands and improve the filtering effect of the filtering circuit. For example, the controller described above can be the aforementioned MCU.

[0032] In this filter circuit, at least two filter capacitors have different capacitance values. Optionally, the power supply filter circuit includes the following four filter capacitors: capacitor 102, capacitor 101, capacitor 103, and capacitor 104. By using capacitors with capacitance values ​​of 102, 101, 103, and 104 in combination for filtering, the filtering effect across different frequency bands can be optimized when the infrared transmitter is coupled to interference, thus meeting reliable filtering requirements and improving EMC performance.

[0033] The aforementioned infrared light emitting circuit includes a switching element, a limiting resistor, and multiple infrared emitting diodes. Each infrared emitting diode is connected to at least one limiting resistor, and the infrared emitting diode and its corresponding limiting resistor are connected in series between the operating voltage and ground. The switching element is connected in series with the limiting resistor and / or the infrared emitting diode to control the connection between the infrared emitting diode and the operating voltage and ground. The control terminal of the switching element is connected to the second pin of the controller.

[0034] In the infrared light emitting circuit, a single-control infrared emitting diode cathode and / or anode is used, controlled by the second pin of the controller. This second pin controls the connection and disconnection between the infrared emitting diode cathode and / or anode and the circuit. The circuit structure is simple and has a low failure rate. A limiting resistor can be placed between the infrared emitting diode and the operating voltage, connected in series. By adjusting the value of the limiting resistor, the emission power of the infrared emitting diode is changed, thereby adjusting the infrared light emission distance and coverage area, improving recognition accuracy.

[0035] The aforementioned infrared light receiving circuit includes a filtering unit, a pull-up resistor, and at least one infrared receiver head. The first pin of the infrared receiver head is connected to the third pin of the controller and is connected to the operating voltage via the pull-up resistor. The second pin of the infrared receiver head is grounded through the filtering unit, and the third pin of the infrared receiver head is connected to the operating voltage.

[0036] The driving circuit for the intelligent human sensing function provided in this embodiment of the invention includes a filter circuit for power supply, an infrared light emitting circuit for emitting infrared light, and an infrared light receiving circuit for receiving infrared light. It can effectively control the emission distance and effective range of infrared light, improve the accuracy of identifying whether there are people or objects in front of the air outlet, and has a simple circuit structure, low cost, stable and reliable signal, and good EMC performance.

[0037] As a feasible implementation, a single-control infrared emitting diode cathode method is used, with one I / O port controlling whether the infrared emitting diode is turned on. The anode of the infrared emitting diode is connected to the operating voltage through multiple limiting resistors, and the cathodes of all infrared emitting diodes are connected to the first terminal of a switching element, while the second terminal of the switching element is grounded. Optionally, the anode of the infrared emitting diode is connected to the operating voltage through at least two parallel limiting resistors. Using a single-control infrared emitting diode cathode method results in a simple circuit and a low failure rate.

[0038] Achieving the required detection range using a single infrared emitting diode is difficult. In this embodiment, the infrared emitting circuit includes multiple infrared emitting diodes and multiple limiting resistors. The anodes of the infrared emitting diodes are connected to the operating voltage through multiple limiting resistors. The cathodes of all infrared emitting diodes are connected to the first terminal of the switching element, and the second terminal of the switching element is grounded. Three infrared emitting diodes are selected.

[0039] Optionally, the filtering unit of the infrared light receiving circuit described above includes multiple parallel filtering capacitors and a current-limiting resistor; the second and third pins of the infrared receiver head are respectively connected to the two ends of the filtering capacitors, and the second pin of the infrared receiver head is grounded, while the third pin is connected to the operating voltage through the current-limiting resistor. Multiple parallel filtering capacitors are connected between the operating voltage and the second and third pins (i.e., the power supply pins of the infrared receiver head), providing a filtered and stable power supply voltage to the infrared receiver head.

[0040] Optionally, the infrared light receiving circuit also includes a protective resistor, through which the first pin of the infrared receiver head is connected to the third pin of the controller. This protective resistor protects against static electricity and interference signals.

[0041] As another feasible implementation method, the anode and cathode of the infrared emitting tube can be controlled separately, with two IO ports controlling the connection between the anode and the working voltage of the infrared emitting tube, and the connection between the cathode and ground of the infrared emitting tube respectively.

[0042] In this embodiment, the infrared light emitting circuit further includes a second switching element, which is disposed between multiple limiting resistors and the operating voltage. The first terminal of the second switching element is connected to the operating voltage, the second terminal is connected to all the limiting resistors, and the control terminal of the second switching element is connected to the third pin of the controller. As described above, the first switching element controls the connection between the cathode of the infrared emitting diode and ground, and the second switching element controls the connection between the anode of the infrared emitting diode and the operating voltage. At least two parallel limiting resistors are disposed between the second switching element and the infrared emitting diode, and the anode of the infrared emitting diode is connected to the second terminal of the second switching element through these at least two parallel limiting resistors.

[0043] Figure 1 This is a schematic diagram of a driving circuit for an intelligent human sensing function provided in this embodiment. The driving circuit includes an infrared light emitting circuit 10, an infrared light receiving circuit 20, and a filtering circuit 30.

[0044] The infrared light emitting circuit 10 controls whether the infrared emitting diode is turned on or off via one I / O port, thereby controlling whether infrared light is emitted. Figure 1 This example uses three infrared emitting diodes (IR1, IR2, IR3) and transistors as the switching element. Figure 1 The driving circuit for the intelligent human sensing function is connected to the main control board through terminal CN1. Pin 4 (i.e., the cathode control port) controls whether the cathodes of the three infrared emitting tubes (IR1, IR2, IR3) are conducting. The controller controls whether the three infrared emitting tubes emit light through pin 4.

[0045] When pin 4 outputs a 5V high level, transistor Q1 is turned on. The 5V high level passes through multiple parallel limiting resistors R4-R9, then through infrared emitting diodes IR1, IR2, and IR3, and then through transistor Q1 to ground. At this time, the infrared light emitting circuit is turned on, and the three infrared emitting diodes IR1, IR2, and IR3 emit light simultaneously.

[0046] When pin 4 outputs a 0V low level, transistor Q1 is not conducting, the infrared light emitting circuit is not conducting, and the three infrared emitting diodes IR1, IR2, and IR3 cannot emit light. The angle of the three infrared emitting diodes can be adjusted according to the installation position to regulate the range of infrared light coverage. The three infrared emitting diodes IR1, IR2, and IR3 can be distributed in a line at equal intervals.

[0047] Figure 1In this configuration, limiting resistors R4 and R5 are connected in parallel, limiting resistors R6 and R7 are connected in parallel, and limiting resistors R8 and R9 are connected in parallel. By adjusting the resistance values, the light emission distance and infrared light coverage range can be adjusted. Optionally, the resistance values ​​of R4, R5, R6, R7, and R8 are 100Ω, and the resistance value of R9 is 120Ω.

[0048] Figure 1 In the infrared light receiving circuit 20, two identical infrared receiver heads are included, which improves the infrared receiving capability, resulting in better performance and higher reliability. The infrared light receiving circuit 20 includes infrared receiver heads REC1 and REC2, resistors R1, R2, and R3, and capacitors C5, C6, and C7.

[0049] After receiving reflected light, REC1 and REC2 output a low level on their first pin (Out pin). The controller's pin 2 (the main controller's infrared receiver port) receives this low level. When the main MCU detects this low level, it determines that there is a person or object in front of the air conditioner vent. If a high level is detected, it determines that there is no person or object. The carrier frequency of REC1 and REC2 is 56.7kHz, and the frequency of the PWM control signal emitted from pin 4 (the cathode control port) is also 56.7kHz, ensuring reliable signal reception by the infrared receiver.

[0050] R2 acts as a pull-up resistor to ensure a stable 5V level when no reflected light is received; R1 provides electrostatic discharge protection and interference prevention; R3 limits current; and C5, C6, and C7 provide filtering. Specifically, R1 has a resistance of 330Ω, R2 has a resistance of 10kΩ, and R3 has a resistance of 100Ω.

[0051] exist Figure 1 In this embodiment, the power supply filter circuit 30 includes four filter capacitors C1, C2, C3, and C4, and a surface-mount inductor L1 with capacitance values ​​of 102, 101, 103, and 104 respectively. The inductance of L1 is selected as 10uH to meet the filtering effect of different frequency bands. Since the connection line between the intelligent human sensing function drive device and the main control board is relatively long, signal coupling is inevitable. In this embodiment, the above-mentioned power supply filter circuit is used to improve EMC performance.

[0052] Figure 2 This is a schematic diagram of another intelligent human sensing function driving circuit provided in this embodiment, showing that the driving circuit includes an infrared light emitting circuit 10, an infrared light receiving circuit 20, and a filtering circuit 30.

[0053] Figure 2 In the process, the infrared light emitting circuit controls the conduction or non-conduction of the anode and cathode of the infrared emitting tube through two I / O ports, thereby controlling whether the three infrared emitting tubes (IR1, IR2, IR3) emit infrared light. Figure 2The terminal CN1 shown is connected to the main control board, where pin 5 (i.e., the anode control port) controls the conduction of the anodes of the three infrared emitting diodes; pin 4 (i.e., the cathode control port) controls the conduction of the cathodes of the three infrared emitting diodes.

[0054] When pin 5 outputs a high level of 5V, transistor Q2 is not turned on, and infrared emitting diodes IR1 and IR2 are not powered.

[0055] When pin 5 outputs a low level of 0V, transistor Q2 is turned on, and thus 5V is supplied to the anodes of infrared emitting diodes IR1, IR2, and IR3 simultaneously through resistors R4, R5, R6, R7, R8, and R9.

[0056] When pin 4 outputs a high level of 5V, transistor Q1 is turned on. At this time, the cathodes of the three infrared emitting diodes are connected to ground. When pin 5 is at a low level, IR1 and IR4 are turned on and emit infrared light.

[0057] When pin 4 outputs a low level (0V), transistor Q1 is not conducting. At this time, the cathodes of the three infrared emitting diodes are not connected to ground, and no infrared light is emitted. Only when pin 5 outputs a low level and pin 4 simultaneously outputs a high level can the three infrared emitting diodes emit infrared light.

[0058] In the circuit described above, R4 and R5 are connected in parallel, R6 and R7 are connected in parallel, and R8 and R9 are connected in parallel. By adjusting the resistance values, the distance at which the infrared emitter emits light and the range of infrared light coverage can be adjusted.

[0059] Figure 2 The infrared light receiving circuit includes two identical sub-receiver circuits, which improves infrared reception capability, resulting in better performance and higher reliability. This circuit includes infrared receiver heads REC1 and REC2, resistors R1, R2, and R3, and capacitors C5, C6, and C7.

[0060] After infrared receivers REC1 and REC2 receive infrared light, their Out pins output a low level, and pin 2 also outputs a low level. When the main control MCU detects this low level, it determines that there is a person or object in front of the air conditioner vent. If a high level is detected, it determines that no one is present. The carrier frequency of REC1 and REC2 is 56.7kHz, therefore the frequency of the PWM control signal emitted from pin 2 (i.e., the cathode control port) is also 56.7kHz, ensuring reliable signal reception.

[0061] R2 acts as a pull-up resistor to ensure a stable voltage level of 5V when no infrared light is received; R1 provides electrostatic discharge protection and prevents interference signals; R3 limits current; C5, C6, and C7 provide a stable power supply voltage to the receiver head REC and also serve as filters.

[0062] The present invention provides a driving circuit for realizing the above-mentioned intelligent human sensing function. This circuit includes a power supply filtering circuit, an infrared light emitting circuit, and an infrared light receiving circuit. It can not only reliably control the infrared light emitting distance and effective range, but also ensure that the infrared receiving signal is stable and reliable. The circuit structure is simple, the filtering effect is good, and the EMC effect is good.

[0063] Specifically, the infrared light emitting circuit can use a single-pin control of the infrared emitting diode's cathode, controlled by one I / O port. Alternatively, it can use separate control of the infrared emitting diode's anode and cathode, controlled by two I / O ports.

[0064] Specifically, by using a parallel connection of limiting resistors, the resistance value can be flexibly adjusted, thereby adjusting the emission distance of the infrared emitting diode and the infrared light coverage range. If the number of infrared emitting diodes is too small, adjustment becomes relatively difficult; in this embodiment of the invention, three infrared emitting diodes are selected.

[0065] Specifically, the infrared light receiving circuit includes two identical infrared receiver heads, which can improve the infrared receiving capability, resulting in better performance and higher reliability.

[0066] Specifically, by connecting a pull-up resistor to the working voltage, a protective resistor for interference and static electricity prevention, and then connecting a current-limiting resistor and a filter capacitor, the infrared receiver head has a stable power supply, a stable infrared signal, and high reliability.

[0067] Specifically, the power supply filter circuit uses capacitors 102, 101, 103, and 104, along with a 10uF surface-mount inductor for synergistic filtering, to ensure that when the infrared emitter is coupled to interference signals, the filtering effect of different frequency bands can be maximized, ensuring reliable filtering and excellent EMC performance.

[0068] This invention provides an indoor unit for an air conditioner, including the driving circuit for the aforementioned intelligent human sensing function.

[0069] This invention provides an air conditioner, including the indoor unit described above.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 driving circuit for intelligent human sensing function, characterized in that, Includes a filter circuit, an infrared light emitting circuit, and an infrared light receiving circuit; The filtering circuit includes a filter inductor and multiple filter capacitors; the multiple filter capacitors are connected in parallel, with the first end of the parallel connection grounded, and the second end of the parallel connection connected to the operating voltage and connected to the first pin of the air conditioner through the filter inductor; or, the second end is connected to the operating voltage through the filter inductor and connected to the first pin through the filter inductor. The infrared light emitting circuit includes a switching element, a limiting resistor, and multiple infrared emitting diodes. Each infrared emitting diode is connected to at least one limiting resistor, and the infrared emitting diode and the corresponding limiting resistor are connected in series between the working voltage and ground. The switching element is connected in series with the limiting resistor and the infrared emitting diode to control the connection and disconnection between the infrared emitting diode and the working voltage and ground. The control terminal of the switching element is connected to the second pin of the controller. The infrared light receiving circuit includes a filtering unit, a pull-up resistor, and at least one infrared receiver head; the first pin of the infrared receiver head is connected to the third pin of the controller and is connected to the operating voltage through the pull-up resistor; the second pin of the infrared receiver head is grounded through the filtering unit, and the third pin of the infrared receiver head is connected to the operating voltage.

2. The driving circuit as described in claim 1, characterized in that, The infrared light emitting circuit includes a first switching element; The anode of the infrared emitting diode is connected to the operating voltage through multiple limiting resistors, the cathodes of all the infrared emitting diodes are connected to the first terminal of the first switching element, the second terminal of the first switching element is grounded, and the control terminal of the first switching element is connected to the second pin of the controller.

3. The driving circuit as described in claim 2, characterized in that, The infrared light emitting circuit further includes a second switching element, which is disposed between the plurality of limiting resistors and the operating voltage; The first terminal of the second switching element is connected to the operating voltage, the second terminal of the second switching element is connected to all of the limiting resistors, and the control terminal of the second switching element is connected to the third pin of the controller.

4. The driving circuit as described in claim 3, characterized in that, The anode of the infrared emitting diode is connected to the operating voltage or the second terminal of the second switching element through at least two parallel limiting resistors.

5. The driving circuit according to any one of claims 1-3, characterized in that, The filtering unit includes multiple parallel-connected filtering capacitors and current-limiting resistors; The second and third pins of the infrared receiver are respectively connected to the two ends of the filter capacitor, and the second pin of the infrared receiver is grounded, while the third pin is connected to the operating voltage through the current limiting resistor.

6. The driving circuit according to any one of claims 1-3, characterized in that, The infrared light receiving circuit also includes a protection resistor, and the first pin of the infrared receiver head is connected to the third pin of the controller through the protection resistor.

7. The driving circuit as described in claim 5, characterized in that, The capacitance values ​​of each of the filter capacitors are different.

8. The driving circuit according to any one of claims 1-3, characterized in that, The number of infrared emitting tubes is three.

9. An indoor unit of an air conditioner, characterized in that, It includes at least one driving circuit for the intelligent human sensing function as described in any one of claims 1-8.

10. An air conditioner, characterized in that, Including the indoor unit of the air conditioner as described in claim 9.

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