Pyroelectric infrared sensor sensitivity adjusting device

Abstract

A pyroelectric infrared sensor sensitivity adjustment device includes a processing module, a sensitivity control module, and a sensing function adjustment module. The processing module receives an input signal and generates a sensitivity control signal according to the input signal. The sensitivity control module is connected to the processing module, receives the sensitivity control signal, and generates a sensitivity adjustment signal according to the sensitivity control signal. The sensing function adjustment module is connected to the processing module and the sensitivity control module, receives the sensitivity adjustment signal and a sensing signal generated by the pyroelectric infrared sensor, adjusts a preset threshold value according to the sensitivity adjustment signal, and compares the sensing signal with the preset threshold value to generate a voltage signal. The processing module generates an activation signal to activate a target device according to the voltage signal or does not generate the activation signal.

Description

TECHNICAL FIELD

[0001] The present application relates to a sensor sensitivity adjustment device, in particular, a pyroelectric infrared sensor sensitivity adjustment device. BACKGROUND

[0002] A pyroelectric infrared (PIR) sensor is a passive infrared sensor which does not emit infrared rays but can detect infrared rays generated by a moving target (such as a person, an animal, etc.) to generate a sensing signal. Pyroelectric infrared sensors have been widely used in lighting systems, alarm systems, etc., and are extremely widely used. However, the existing pyroelectric infrared sensors still have many shortcomings to be improved. For example, the sensitivity of the existing pyroelectric infrared sensors cannot be adjusted, so it cannot meet the needs of different applications (for example, if the sensor is far away from the moving target, the sensor needs higher sensitivity; on the contrary, if the sensor is close to the moving target, the sensor needs lower sensitivity).

[0003] In addition, the sensitivity of the pyroelectric infrared sensor may decrease after being used for a period of time. Since the existing pyroelectric infrared sensor lacks a correction mechanism, it may not be able to effectively sense the moving target. SUMMARY

[0004] According to an embodiment of the present application, a pyroelectric infrared sensor sensitivity adjustment device is provided, which includes a processing module, a sensitivity control module, and a sensing function adjustment module. The processing module receives an input signal and generates a sensitivity control signal according to the input signal. The sensitivity control module is connected with the processing module and receives the sensitivity control signal, and generates a sensitivity adjustment signal according to the sensitivity control signal. The sensing function adjustment module is connected with the processing module and the sensitivity control module, and receives the sensitivity adjustment signal and a sensing signal generated by the pyroelectric infrared sensor. The sensing function adjustment module adjusts a preset threshold value according to the sensitivity adjustment signal, and compares the sensing signal with the preset threshold value to generate a voltage signal. The processing module generates an activation signal to activate a target device according to the voltage signal or does not generate the activation signal.

[0005] In an embodiment, when the sensing signal is greater than or equal to the preset threshold value, the voltage signal generated by the sensing function adjustment module is high, and the processing module generates an activation signal to activate the target device according to the voltage signal.

[0006] In an embodiment, when the sensing signal is lower than the preset threshold value, the voltage signal generated by the sensing function adjustment module is low, and the processing module does not generate the activation signal.

[0007] In an embodiment, the sensing function adjustment module stores each received sensing signal, and sequentially divides a preset number of most recently received sensing signals into at least three groups, the time points of the sensing signals in each group being adjacent. The sensing function adjustment module calculates the average of the intensities of the sensing signals in each group, and adjusts the preset threshold value according to the average of each group.

[0008] In an embodiment, the three groups include a first group, a second group, and a third group. The sensing function adjustment module calculates the difference between the average of the third group and the average of the second group when the average of the first group is less than the average of the second group and the average of the second group is less than the average of the third group, and adjusts the preset threshold value according to the ratio of the difference to the average of the third group.

[0009] In an embodiment, the sensing function adjustment module generates an adjustment value by subtracting the ratio from 1, and generates an adjusted preset threshold value by multiplying the adjustment value by the preset threshold value, and generates the voltage signal according to the adjusted preset threshold value.

[0010] In an embodiment, the pyroelectric infrared sensor sensitivity adjustment device further includes a power module. The power module is connected to the processing module.

[0011] In an embodiment, the power module includes a rectifier circuit, a filter circuit, and a converter.

[0012] In an embodiment, the processing module is a microcontroller, a central processing unit, an application specific integrated circuit chip, or a field programmable logic gate array.

[0013] In an embodiment, the sensing function adjustment module is a microcontroller, a central processing unit, an application specific integrated circuit chip, or a field programmable logic gate array.

[0014] As described above, the pyroelectric infrared sensor sensitivity adjustment device according to the embodiments of the present application can have one or more of the following advantages:

[0015] (1) In an embodiment of the present application, the pyroelectric infrared sensor sensitivity adjustment device comprises a processing module, a sensitivity control module, and a sensing function adjustment module. The processing module receives an input signal and generates a sensitivity control signal according to the input signal. The sensitivity control module is connected to the processing module and receives the sensitivity control signal, and generates a sensitivity adjustment signal according to the sensitivity control signal. The sensing function adjustment module is connected to the processing module and the sensitivity control module, and receives the sensitivity adjustment signal and a sensing signal generated by the pyroelectric infrared sensor. The sensing function adjustment module adjusts a preset threshold value according to the sensitivity adjustment signal, and compares the sensing signal with the preset threshold value to generate a voltage signal. The processing module generates an activation signal to activate a target device according to the voltage signal or does not generate the activation signal. As described above, the pyroelectric infrared sensor sensitivity adjustment device integrates the sensitivity control module and the sensing function adjustment module to achieve the sensitivity adjustment function. Therefore, the user can adjust the sensitivity of the pyroelectric infrared sensor according to actual needs to meet the needs of different applications.

[0016] (2) In an embodiment of the present application, the sensing function adjustment module of the pyroelectric infrared sensor sensitivity adjustment device can store each received sensing signal, and sequentially divide a preset number of recently received sensing signals into at least three groups. The time points of the sensing signals in each group are adjacent. The sensing function adjustment module calculates the average value of the intensity of the sensing signals in each group, and fine-tunes the preset threshold value according to the average value of each group. Through the above window fine-tuning mechanism (sequentially dividing the sensing signals into groups, each group can be regarded as a window), the pyroelectric infrared sensor sensitivity adjustment device can adaptively and automatically adjust the sensitivity of the pyroelectric infrared sensor according to the aging state of the pyroelectric infrared sensor, and can achieve high adjustment accuracy. Therefore, the pyroelectric infrared sensor can still achieve very high detection accuracy to meet the needs of actual applications.

[0017] (3) In an embodiment of the present application, the circuit design of the sensitivity control module of the pyroelectric infrared sensor sensitivity adjustment device can realize multiple sensitivity adjustment levels for the user to select. The user can execute an application program through an electronic device (such as a smart phone, a tablet computer, a notebook computer, etc.) to operate the sensitivity control module and select a suitable sensitivity adjustment level. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can meet the needs of different users and is more flexible in use.

[0018] (4) In one embodiment of the present invention, a user can operate the sensitivity control module via an electronic device to select an appropriate sensitivity adjustment level. Therefore, the pyroelectric infrared sensor sensitivity adjustment device is not only convenient and simple to use, but also allows the user to quickly perform sensitivity adjustment operations without the assistance of a technician. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can be applied more widely and better meet the needs of practical applications.

[0019] (5) In one embodiment of the present invention, the pyroelectric infrared sensor sensitivity adjustment device can be integrated with various existing intelligent systems (e.g., smart home systems) to implement various intelligent applications. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can improve the functionality of existing intelligent systems and thus meet future development trends.

[0020] (6) In one embodiment of the present invention, the design of the pyroelectric infrared sensor sensitivity adjustment device is simple, so the desired effect can be achieved without significantly increasing the cost. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can achieve higher practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A block diagram of the circuit structure of a pyroelectric infrared sensor sensitivity adjustment device according to a first embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the operation of the pyroelectric infrared sensor sensitivity adjustment device according to the first embodiment of the present invention;

[0023] Figure 3 A circuit diagram of a pyroelectric infrared sensor sensitivity adjustment device according to a first embodiment of the present invention;

[0024] Figure 4 is a block diagram of the circuit structure of a pyroelectric infrared sensor sensitivity adjustment device according to a second embodiment of the present invention;

[0025] Figure 5 This is a flow chart of a method for adjusting the sensitivity of a pyroelectric infrared sensor according to a third embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1- Pyroelectric infrared sensor sensitivity adjustment device; 11- Processing module; 12- Sensitivity control module; 13- Sensing function adjustment module; 14- Power module; R1-R6- Resistors; S1-S2- Switches; T1- Signal receiving pin; SEN1- First signal output pin; SEN2- Second signal output pin; X1- Voltage output pin; X2- Sensitivity adjustment pin; ED- Electronic device; TB- Target device; PR- Pyroelectric infrared sensor; Is- Input signal; Fs- Sensitivity control signal; As- Sensitivity adjustment signal; Ds- Sensing signal; Vs- Voltage signal; Cs- Start signal; S51-S57- Step flow.

[0028] The detailed features and advantages of the present invention are described in detail in the following embodiments, and the content is sufficient to enable anyone skilled in the relevant art to understand the technical content of the present invention and implement it accordingly. Moreover, based on the content, claims and drawings disclosed in this specification, anyone skilled in the relevant art can easily understand the purposes and advantages of this creation. DETAILED DESCRIPTION

[0029] The following describes embodiments of a pyroelectric infrared sensor sensitivity adjustment device according to the present invention with reference to the relevant drawings. For clarity and ease of illustration, the dimensions and proportions of the components in the drawings may be exaggerated or reduced. In the following description and / or claims, when a component is referred to as being "connected" or "coupled" to another component, it may be directly connected or coupled to the other component or with intervening components. When a component is referred to as being "directly connected" or "directly coupled" to another component, no intervening components are present. Other terms used to describe relationships between components or layers should be interpreted similarly. For ease of understanding, identical components in the following embodiments are labeled with the same reference symbols.

[0030] See also Figure 1 and Figure 2 . Figure 1 FIG. 1 is a block diagram of a circuit structure of a pyroelectric infrared sensor (PIR) sensitivity adjustment device according to a first embodiment of the present invention. Figure 2 FIG. 1 is a schematic diagram of the operating state of the pyroelectric infrared sensor sensitivity adjustment device according to the first embodiment of the present invention. Figure 1 As shown, the pyroelectric infrared sensor sensitivity adjustment device 1 includes a processing module 11 , a sensitivity control module 12 and a sensing function adjustment module 13 .

[0031] The processing module 11 is connected to the sensitivity control module 12 and the sensing function adjustment module 13, and the sensitivity control module 12 and the sensing function adjustment module 13 are also connected to each other. In an embodiment, the processing module 11 can be a microcontroller (MCU). In another embodiment, the processing module 11 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other similar components. In an embodiment, the sensing function adjustment module 13 can be a microcontroller (MCU). In another embodiment, the sensing function adjustment module 13 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other similar components.

[0032] Of course, the present embodiment is only used for illustration and not limit the scope of the present application, and equivalent modifications or changes made according to the pyroelectric infrared sensor sensitivity adjustment device of the present embodiment should still be included in the patent scope of the present application.

[0033] As shown in Figure 2 The processing module 11 receives the input signal Is and generates the sensitivity control signal Fs according to the input signal Is. The user can execute an application program through the electronic device ED (such as a smart phone, a tablet computer, a notebook computer, etc.) to generate the input signal Is.

[0034] The sensitivity control module 12 receives the sensitivity control signal Fs and generates the sensitivity adjustment signal As according to the sensitivity control signal Fs.

[0035] The sensing function adjustment module 13 receives the sensitivity adjustment signal As. Then, the sensing function adjustment module 13 adjusts the preset threshold value according to the sensitivity adjustment signal As. When the pyroelectric infrared sensor PR detects a moving target (such as a person, an animal, etc.), it will generate a sensing signal Ds and transmit the sensing signal Ds to the sensing function adjustment module 13. The sensing function adjustment module 13 compares the sensing signal Ds with the preset threshold value to generate a voltage signal Vs and transmits the voltage signal Vs to the processing module 11.

[0036] Finally, the processing module 11 generates the start signal Cs to start the target device TB according to the voltage signal Vs or does not generate the start signal Cs. When the sensing signal Ds is greater than or equal to the preset threshold value, the voltage signal Vs generated by the sensing function adjustment module 13 is high; at this time, the processing module 11 generates the start signal Cs to start the target device TB according to the voltage signal Vs. When the sensing signal Ds is lower than the preset threshold value, the voltage signal Vs generated by the sensing function adjustment module 13 is low; at this time, the processing module 11 does not generate the start signal Cs. In the embodiment, the target device TB can be a lighting device. In another embodiment, the target device TB can also be any existing electronic device or household appliance, such as a sound, a television, an alarm, etc. For example, if the distance between the pyroelectric infrared sensor PR and the moving target is far, the user can adjust the sensitivity of the pyroelectric infrared sensor PR to be high. Conversely, if the distance between the pyroelectric infrared sensor PR and the moving target is close, the user can adjust the sensitivity of the pyroelectric infrared sensor PR to be low.

[0037] After a long time of use, the pyroelectric infrared sensor PR can be aged. The sensing function adjustment module 13 can also perform a special window fine-tuning mechanism to adaptively and automatically adjust the sensitivity of the pyroelectric infrared sensor PR according to the aging state of the pyroelectric infrared sensor PR. The sensing function adjustment module 13 can store each received sensing signal Ds, and sequentially divide the preset number of the most recently received sensing signals Ds into at least three groups, the time points of the sensing signals Ds in each group being adjacent. The sensing function adjustment module 13 calculates the average value of the intensity of the sensing signals Ds in each group, and fine-tunes the preset threshold value according to the average value of each group. For example, the above three groups include a first group, a second group, and a third group (but not limited to three groups, which can be adjusted according to actual needs). When the average value of the first group is less than the average value of the second group and the average value of the second group is less than the average value of the third group, the sensing function adjustment module 13 calculates the difference value between the average value of the third group and the average value of the second group, and adjusts the preset threshold value according to the ratio of the difference value to the average value of the third group. The sensing function adjustment module 13 subtracts 1 from the ratio to generate an adjustment value, and multiplies the adjustment value by the preset threshold value to generate an adjusted preset threshold value, and generates the voltage signal according to the adjusted preset threshold value.

[0038] For example, the sensing function adjustment module 13 can divide the last received 15 (the preset number is not limited to 15, which can be adjusted according to actual needs) sensing signals D into three groups in sequence. Each group has 5 sensing signals D, and the time points of these sensing signals D are adjacent. That is, the first group has 5 sensing signals D, and the time points of these sensing signals D are adjacent. The second group has 5 sensing signals D, and the time points of these sensing signals D are adjacent. The third group has 5 sensing signals D, and the time points of these sensing signals D are adjacent. The sensing function adjustment module 13 calculates the average value of the intensity of the sensing signals D in each group. If the average value of the first group is less than the average value of the second group and the average value of the second group is less than the average value of the third group, the sensing function adjustment module 13 determines that the pyroelectric infrared sensor PR has generated an aging phenomenon. At this time, the sensing function adjustment module 13 calculates the difference between the average value of the third group and the average value of the second group, and calculates the ratio of this difference to the average value of the third group. Then, the sensing function adjustment module 13 subtracts 1 from the ratio to generate an adjustment value, and multiplies the adjustment value by the preset threshold value to generate an adjusted preset threshold value, and generates the voltage signal Vs according to the adjusted preset threshold value. For example, if the above adjustment value is 0.9, the sensing function adjustment module 13 multiplies 0.9 by the preset threshold value to generate an adjusted preset threshold value, and generates the voltage signal Vs according to the adjusted preset threshold value.

[0039] As can be seen from the above, in the present embodiment, the pyroelectric infrared sensor sensitivity adjustment device 1 integrates the sensitivity control module 12 and the sensing function adjustment module 13 to achieve the sensitivity adjustment function. Therefore, the user can adjust the sensitivity of the pyroelectric infrared sensor 1 according to actual needs to meet the needs of different applications.

[0040] In addition, in the present embodiment, the sensing function adjustment module 13 of the pyroelectric infrared sensor sensitivity adjustment device 1 can store each received sensing signal D, and divide the last received preset number of sensing signals D into at least three groups in sequence. The time points of the sensing signals D in each group are adjacent. The sensing function adjustment module 13 calculates the average value of the intensity of the sensing signals D in each group, and fine tunes the preset threshold value according to the average value of each group. Through the above window fine tuning mechanism (dividing the sensing signals D into groups in sequence, each group can be regarded as a window), the pyroelectric infrared sensor sensitivity adjustment device 1 can adaptively and automatically adjust the sensitivity of the pyroelectric infrared sensor PR according to the aging state of the pyroelectric infrared sensor PR, and can achieve high adjustment accuracy. Therefore, the pyroelectric infrared sensor 1 can still achieve extremely high detection accuracy to meet the needs of actual applications.

[0041] In addition, in the present embodiment, the circuit design of the sensitivity control module 12 of the pyroelectric infrared sensor sensitivity adjustment device 1 can realize multiple sensitivity adjustment gears for the user to select. The user can execute an application through the electronic device ED (such as a smart phone, a tablet computer, a notebook computer, etc.) to operate the sensitivity control module 12 and select a suitable sensitivity adjustment gear. Therefore, the pyroelectric infrared sensor sensitivity adjustment device 1 can meet the needs of different users and is more flexible in use.

[0042] Of course, the present embodiment is only used for illustration and does not limit the scope of the present application, and equivalent modifications or changes made to the pyroelectric infrared sensor sensitivity adjustment device according to the present embodiment should still be included in the patent scope of the present application.

[0043] Please refer to Figure 3 , which is a circuit diagram of the pyroelectric infrared sensor sensitivity adjustment device of the first embodiment of the present application. As shown in the figure, the pyroelectric infrared sensor sensitivity adjustment device 1 includes a processing module 11, a sensitivity control module 12 and a sensing function adjustment module 13.

[0044] The processing module 11 includes a signal receiving pin T1, a first signal output pin SEN1 and a second signal output pin SEN2.

[0045] The sensing function adjustment module 13 includes a voltage output pin X1 and a sensitivity adjustment pin X2.

[0046] The sensitivity control module 12 includes two voltage dividing circuits. The first voltage dividing circuit includes resistors R1-R3 and a switch S1. The second voltage dividing circuit includes resistors R4-R6 and a switch S2.

[0047] The processing module 11 outputs a sensitivity control signal Fs through the first signal output pin SEN1 and the second signal output pin SEN2. The sensitivity control module 12 receives the sensitivity control signal Fs and generates a sensitivity adjustment signal As according to the sensitivity control signal Fs, and inputs the sensitivity adjustment signal As to the sensitivity adjustment pin X2 of the sensing function adjustment module 13. The two voltage dividing circuits of the sensitivity control module 12 can generate four different sensitivity adjustment gears. Then, the voltage output pin X1 of the sensing function adjustment module 13 can output a voltage signal Vs to the signal receiving pin T1 of the processing module 11. The above-mentioned circuit design can be changed according to actual needs, and the sensitivity control module 12 can generate more sensitivity adjustment gears, which is not limited by the present application.

[0048] Of course, the present embodiment is only used for illustration and does not limit the scope of the present application, and equivalent modifications or changes made to the pyroelectric infrared sensor sensitivity adjustment device according to the present embodiment should still be included in the patent scope of the present application.

[0049] It is worth mentioning that the sensitivity of the existing pyroelectric infrared sensor cannot be adjusted, so it cannot meet the needs of different applications (for example, if the sensor is far away from the moving target, the sensor needs higher sensitivity; on the contrary, if the sensor is close to the moving target, the sensor needs lower sensitivity). In addition, the sensitivity of the pyroelectric infrared sensor may decrease after being used for a period of time. Since the existing pyroelectric infrared sensor lacks a correction mechanism, it may not be able to effectively sense the moving target. In contrast, according to the embodiment of the present application, the pyroelectric infrared sensor sensitivity adjustment device includes a processing module, a sensitivity control module, and a sensing function adjustment module. The processing module receives an input signal and generates a sensitivity control signal according to the input signal. The sensitivity control module is connected with the processing module and receives the sensitivity control signal, and generates a sensitivity adjustment signal according to the sensitivity control signal. The sensing function adjustment module is connected with the processing module and the sensitivity control module, and receives the sensitivity adjustment signal and the sensing signal generated by the pyroelectric infrared sensor. The sensing function adjustment module adjusts the preset threshold value according to the sensitivity adjustment signal, and compares the sensing signal with the preset threshold value to generate a voltage signal. The processing module generates an activation signal to activate the target device according to the voltage signal or does not generate the activation signal. As can be seen from the above, the pyroelectric infrared sensor sensitivity adjustment device integrates the sensitivity control module and the sensing function adjustment module to achieve the sensitivity adjustment function. Therefore, the user can adjust the sensitivity of the pyroelectric infrared sensor according to the actual needs to meet the needs of different applications.

[0050] According to the embodiment of the present application, the sensing function adjustment module of the pyroelectric infrared sensor sensitivity adjustment device can store each received sensing signal, and sequentially divide the most recently received preset number of sensing signals into at least three groups. The time points of the sensing signals in each group are adjacent. The sensing function adjustment module calculates the average value of the intensity of the sensing signals in each group, and fine-tunes the preset threshold value according to the average value of each group. Through the above window fine-tuning mechanism (sequentially dividing the sensing signals into groups, each group can be regarded as a window), the pyroelectric infrared sensor sensitivity adjustment device can adaptively and automatically adjust the sensitivity of the pyroelectric infrared sensor according to the aging state of the pyroelectric infrared sensor, and can achieve high adjustment accuracy. Therefore, the pyroelectric infrared sensor can still achieve very high detection accuracy to meet the needs of actual applications.

[0051] Furthermore, according to embodiments of the present invention, the circuit design of the sensitivity control module of the pyroelectric infrared sensor sensitivity adjustment device enables multiple sensitivity adjustment levels for user selection. Users can operate the sensitivity control module and select the appropriate sensitivity adjustment level by running an application on an electronic device (such as a smartphone, tablet, or laptop). Therefore, the pyroelectric infrared sensor sensitivity adjustment device can meet the needs of different users and provide greater flexibility.

[0052] Furthermore, according to embodiments of the present invention, users can operate the sensitivity control module via an electronic device to select the appropriate sensitivity adjustment level. Therefore, the pyroelectric infrared sensor sensitivity adjustment device is not only convenient and simple to use, but also allows users to quickly perform sensitivity adjustment without the assistance of a technician. Consequently, the pyroelectric infrared sensor sensitivity adjustment device can be applied more widely and better meet practical application needs.

[0053] Furthermore, according to embodiments of the present invention, the pyroelectric infrared sensor sensitivity adjustment device can be integrated with various existing intelligent systems (such as smart home systems) to implement various intelligent applications. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can improve the functionality of existing intelligent systems and thus meet future development trends.

[0054] Furthermore, according to the embodiments of the present invention, the pyroelectric infrared sensor sensitivity adjustment device has a simple design, thus achieving the desired effect without significantly increasing costs. Therefore, the pyroelectric infrared sensor sensitivity adjustment device achieves greater practicality. As can be seen from the foregoing, the pyroelectric infrared sensor sensitivity adjustment device according to the embodiments of the present invention can indeed achieve excellent technical results.

[0055] See also Figure 4 , which is a block diagram of the circuit structure of a pyroelectric infrared sensor sensitivity adjustment device according to a second embodiment of the present invention. As shown in the figure, the pyroelectric infrared sensor sensitivity adjustment device 1 includes a processing module 11, a sensitivity control module 12, and a sensing function adjustment module 13.

[0056] The processing module 11 is connected to the sensitivity control module 12 and the sensing function adjustment module 13, and the sensitivity control module 12 and the sensing function adjustment module 13 are also connected to each other. In an embodiment, the processing module 11 can be a microcontroller (MCU). In another embodiment, the processing module 11 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other similar components. In an embodiment, the sensing function adjustment module 13 can be a microcontroller (MCU). In another embodiment, the sensing function adjustment module 13 can be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other similar components.

[0057] The above components are similar to those of the previous embodiments, and thus will not be described again. Different from the previous embodiments, the pyroelectric infrared sensor sensitivity adjustment device 1 of the present embodiment further comprises a power module 14. The power module 14 is connected to the processing module 11. The power module 14 comprises a rectifier circuit, a filter circuit, a converter, and other necessary components, for supplying power to the processing module 11. Therefore, the pyroelectric infrared sensor sensitivity adjustment device 1 can be arranged at a suitable position in a building, and connected to an external power source (such as a mains power supply, etc.). In another embodiment, the pyroelectric infrared sensor sensitivity adjustment device 1 can also have a battery, and supply power to the processing module 11 through the battery.

[0058] Of course, the present embodiment is only used for illustration and not for limiting the scope of the present application, and equivalent modifications or changes made to the pyroelectric infrared sensor sensitivity adjustment device according to the present embodiment should still be included in the patent scope of the present application.

[0059] Please refer to Figure 5 which is a flowchart of the pyroelectric infrared sensor sensitivity adjustment method of the third embodiment of the present application. As shown in the figure, the pyroelectric infrared sensor sensitivity adjustment method of the present embodiment can comprise the following steps:

[0060] Step S51: receiving an input signal by a processing module.

[0061] Step S52: generating a sensitivity control signal by the processing module according to the input signal.

[0062] Step S53: receiving the sensitivity control signal via a sensitivity control module.

[0063] Step S54: generating a sensitivity adjustment signal by the sensitivity control module according to the sensitivity control signal.

[0064] Step S55: receiving the sensitivity adjustment signal and a sensing signal generated by a pyroelectric infrared sensor via a sensing function adjustment module.

[0065] Step S56: Adjusting the preset threshold value according to the sensitivity adjustment signal by the sensing function adjustment module, and comparing the sensing signal with the preset threshold value to generate a voltage signal.

[0066] Step S57: Generating an activation signal to activate the target device according to the voltage signal by the processing module or not generating the activation signal.

[0067] Of course, the present embodiment is only used for illustration and not limit the scope of the present application, equivalent modifications or changes according to the pyroelectric infrared sensor sensitivity adjustment method of the present embodiment should still be included in the patent scope of the present application.

[0068] Although the steps of the method described in the present application are shown and described in a particular order, the order of the operations of each method can be changed, and some steps can be performed in reverse order, or some steps can be performed simultaneously with other steps. In another embodiment, not all steps can be implemented intermittently and / or alternately.

[0069] In summary, according to the embodiment of the present application, the pyroelectric infrared sensor sensitivity adjustment device includes a processing module, a sensitivity control module and a sensing function adjustment module. The processing module receives an input signal and generates a sensitivity control signal according to the input signal. The sensitivity control module is connected with the processing module and receives the sensitivity control signal, and generates a sensitivity adjustment signal according to the sensitivity control signal. The sensing function adjustment module is connected with the processing module and the sensitivity control module, and receives the sensitivity adjustment signal and the sensing signal generated by the pyroelectric infrared sensor. The sensing function adjustment module adjusts the preset threshold value according to the sensitivity adjustment signal, and compares the sensing signal with the preset threshold value to generate a voltage signal. The processing module generates an activation signal to activate the target device according to the voltage signal or does not generate the activation signal. As described above, the pyroelectric infrared sensor sensitivity adjustment device integrates the sensitivity control module and the sensing function adjustment module to achieve the sensitivity adjustment function. Therefore, the user can adjust the sensitivity of the pyroelectric infrared sensor according to the actual needs to meet the needs of different applications.

[0070] According to embodiments of the present application, the sensing function adjustment module of the pyroelectric infrared sensor sensitivity adjustment device can store each received sensing signal and sequentially divide the most recently received preset number of sensing signals into at least three groups. The time points of the sensing signals of each group are adjacent. The sensing function adjustment module calculates the average of the intensities of the sensing signals of each group and fine tunes the preset threshold value according to the average of each group. Through the above-mentioned window fine tuning mechanism (sequentially dividing the sensing signals into groups, each group can be regarded as a window), the pyroelectric infrared sensor sensitivity adjustment device can adaptively and automatically adjust the sensitivity of the pyroelectric infrared sensor according to the aging state of the pyroelectric infrared sensor and achieve high adjustment accuracy. Therefore, the pyroelectric infrared sensor can still achieve extremely high detection accuracy to meet the needs of practical applications.

[0071] In addition, according to embodiments of the present application, the circuit design of the sensitivity control module of the pyroelectric infrared sensor sensitivity adjustment device can implement multiple sensitivity adjustment levels for users to select. Users can execute an application program through an electronic device (such as a smart phone, a tablet computer, a notebook computer, etc.) to operate the sensitivity control module and select a suitable sensitivity adjustment level. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can meet the needs of different users and is more flexible to use.

[0072] In addition, according to embodiments of the present application, users can operate the sensitivity control module through an electronic device to select a suitable sensitivity adjustment level. Therefore, the pyroelectric infrared sensor sensitivity adjustment device is not only convenient and simple to use, but users can quickly perform the sensitivity adjustment operation without the assistance of technical personnel. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can be more widely applied and can meet the needs of practical applications.

[0073] In addition, according to embodiments of the present application, the pyroelectric infrared sensor sensitivity adjustment device can be integrated with existing various smart systems (such as a smart home system) to realize different smart applications. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can improve the functions of existing smart systems and can meet the future development trend.

[0074] In addition, according to embodiments of the present application, the pyroelectric infrared sensor sensitivity adjustment device is simple in design and can achieve the desired effects without significantly increasing the cost. Therefore, the pyroelectric infrared sensor sensitivity adjustment device can achieve higher practicality.

[0075] It should be noted that, although the above-mentioned embodiments have been described herein, the patent protection scope of the present application is not limited thereby. Therefore, based on the innovative idea of the present application, the changes and modifications made to the embodiments described herein, or the equivalent structures or equivalent process transformations made using the content of the present application specification and drawings, directly or indirectly apply the above technical solutions to other related technical fields, are all included in the protection scope of the present application patent.

Claims

1. A pyroelectric infrared sensor sensitivity adjustment device, characterized in that: include: a processing module, configured to receive an input signal and generate a sensitivity control signal according to the input signal; a sensitivity control module, connected to the processing module and configured to receive the sensitivity control signal and generate a sensitivity adjustment signal according to the sensitivity control signal; as well as a sensing function adjustment module connected to the processing module and the sensitivity control module and configured to receive the sensitivity adjustment signal and the sensing signal generated by the pyroelectric infrared sensor; The sensing function adjustment module adjusts a preset threshold value based on the sensitivity adjustment signal and compares the sensing signal with the preset threshold value to generate a voltage signal. The processing module generates an activation signal to activate the target device or does not generate the activation signal based on the voltage signal. The sensing function adjustment module stores each received sensing signal and sequentially divides a predetermined number of the sensing signals received most recently into a first group, a second group, and a third group. The sensing signals in each of the first, second, and third groups are generated at adjacent time points. The sensing function adjustment module calculates an average value of the strengths of the sensing signals in each of the first, second, and third groups. When the average value of the first group is less than the average value of the second group and the average value of the second group is less than the average value of the third group, the module calculates a difference between the average value of the third group and the average value of the second group, and adjusts the preset threshold value based on a ratio of the difference value to the average value of the third group.

2. The pyroelectric infrared sensor sensitivity adjustment device according to claim 1, wherein: When the sensing signal is greater than or equal to the preset threshold, the voltage signal generated by the sensing function adjustment module is at a high level, and the processing module generates the activation signal according to the voltage signal to activate the target device.

3. The pyroelectric infrared sensor sensitivity adjustment device according to claim 2, wherein: When the sensing signal is lower than the preset threshold value, the voltage signal generated by the sensing function adjustment module is at a low level, and the processing module does not generate the start signal.

4. The pyroelectric infrared sensor sensitivity adjustment device according to claim 1, wherein: The sensing function adjustment module subtracts the ratio from 1 to generate an adjustment value, multiplies the adjustment value by the preset threshold value to generate an adjusted preset threshold value, and generates the voltage signal according to the adjusted preset threshold value.

5. The pyroelectric infrared sensor sensitivity adjustment device according to claim 1, wherein: It also includes a power supply module, which is connected to the processing module.

6. The pyroelectric infrared sensor sensitivity adjustment device according to claim 5, wherein: The power supply module includes a rectifier circuit, a filter circuit and a converter.

7. The pyroelectric infrared sensor sensitivity adjustment device according to claim 1, wherein: The processing module is a microcontroller, a central processing unit, a special application integrated circuit chip or a field programmable logic gate array.

8. The pyroelectric infrared sensor sensitivity adjustment device according to claim 1, wherein: The sensing function adjustment module is a microcontroller, a central processing unit, a special application integrated circuit chip or a field programmable logic gate array.

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