Remote passive infrared sensing device and lighting system using same

Abstract

The utility model discloses a long-distance passive infrared sensing device and a lighting system using the same. The long-distance passive infrared sensing device comprises a passive infrared sensor, an amplifier, a comparator and a reflection cup, the amplifier is electrically connected with the passive infrared sensor. The comparator is electrically connected with the amplifier. The reflective cup is adjacent to the passive infrared sensor. And the outer surface of the reflecting cup is a reflecting surface. The reflecting surface of the reflecting cup is configured to reflect the infrared rays to the passive infrared sensor. When a long-distance human body emits infrared rays with the wavelength of about 10 microns, the reflection cup can be used as an element for collecting signals, increasing the signal intensity and increasing the sensing distance.

Description

Technical Field

[0001] This disclosure relates to a passive infrared sensing device, and more particularly to a long-range passive infrared sensing device. Background Technology

[0002] A passive infrared sensor (PIR) is a type of sensor that can be used for lighting control. It can receive infrared light within a specific wavelength range, which in turn affects the pyroelectric element of the sensor and generates a potential difference signal.

[0003] The human body maintains a constant body temperature, generally around 37 degrees Celsius, and therefore emits infrared radiation with a specific wavelength of about 10μm. Passive infrared sensors can detect this 10μm infrared radiation emitted by the human body. When a pyroelectric element receives infrared radiation from the human body and its temperature changes, it loses its charge balance and releases a charge. Subsequent circuitry processes this charge to generate a signal. However, the sensing distance of passive infrared sensors is only about 8 to 12 meters, which is not suitable for long-distance applications. Utility Model Content

[0004] According to some embodiments disclosed herein, a long-range passive infrared sensing device includes a passive infrared sensor, an amplifier, a comparator, and a reflector cup. The amplifier is electrically connected to the passive infrared sensor. The comparator is electrically connected to the amplifier. The reflector cup is adjacent to the passive infrared sensor. The outer surface of the reflector cup is a reflective surface. The reflective surface of the reflector cup is configured to reflect infrared light to the passive infrared sensor.

[0005] In some embodiments, the aforementioned long-range passive infrared sensing device further includes a Fresnel lens. The Fresnel lens covers the passive infrared sensor and the reflector cup.

[0006] In some embodiments, the aforementioned long-range passive infrared sensing device further includes a circuit board. The passive infrared sensor, amplifier, and comparator are located on the circuit board.

[0007] In some embodiments, the aforementioned long-range passive infrared sensing device further includes a cover. The cover covers the circuit board and has a signal output port. The passive infrared sensor outputs a signal from this signal output port.

[0008] In some embodiments, the reflective cup is located on the lid, and the bottom of the reflective cup is adjacent to the passive infrared sensor.

[0009] In some embodiments, the bottom of the reflective cup is located between the rim of the reflective cup and the passive infrared sensor.

[0010] In some embodiments, the aforementioned reflective cup has opposing side walls extending from the bottom of the cup, and each of these side walls forms an obtuse angle with the bottom of the cup.

[0011] In some embodiments, the passive infrared sensor described above has a rectangular sensing area.

[0012] In some embodiments, the long side of the rectangular sensing area is parallel to the radial direction of the reflective cup.

[0013] In some embodiments, the short side of the rectangular sensing area is parallel to the axis of the reflective cup.

[0014] According to some embodiments of this disclosure, a lighting system using a long-range passive infrared sensing device utilizes the aforementioned long-range passive infrared sensing device.

[0015] In the above-disclosed embodiment, since the long-range passive infrared sensing device has a reflector cup, and the reflector cup is adjacent to the passive infrared sensor, when a distant human body emits infrared light with a wavelength of approximately 10 μm, the infrared light can be reflected to the passive infrared sensor via the reflective surface of the reflector cup. In other words, the reflector cup can serve as a component for signal collection, increasing signal strength, and extending the sensing distance. In use, the reflector cup collects light and focuses the infrared light onto the passive infrared sensor. The signal is then amplified by an amplifier and compared and filtered by a comparator to output a signal that is received by the lighting fixture. With this configuration, the long-range passive infrared sensing device can extend the sensing distance to over 35 meters. Attached Figure Description

[0016] The nature of this disclosure can be best understood by reading it in conjunction with the accompanying illustrations and by the embodiments described below. Note that, according to standard practice in the industry, the various features are not drawn to scale. In fact, the dimensions of the various features may be increased or decreased arbitrarily for clarity of explanation.

[0017] Figure 1 A perspective view of a long-range passive infrared sensing device according to an embodiment of the present disclosure is shown.

[0018] Figure 2 Draw Figure 1 Front view of the long-range passive infrared sensing device after removing the Fresnel lens and housing;

[0019] Figure 3 Draw Figure 2 Block diagram of a long-range passive infrared sensing device;

[0020] Figures 4 to 6 Draw Figure 2 A schematic diagram of the optical path when the reflector cup reflects infrared light to the passive infrared sensor;

[0021] Figure 7 Draw Figure 1 and Figure 2 A schematic diagram of signal transmission during the use of a long-range passive infrared sensing device;

[0022] Figure 8A A circuit diagram of a regulated power supply line according to an embodiment of this disclosure is shown;

[0023] Figure 8B A circuit diagram of a passive infrared sensor and a microcontroller according to an embodiment of this disclosure is shown.

[0024] Figure 9A Draw Figure 8B Detailed circuit diagram of the passive infrared sensor;

[0025] Figure 9B Draw Figure 8B The components included in a microcontroller;

[0026] Figure 10 Draw Figure 1 and Figure 2 Distribution map of distance detection data from a long-range passive infrared sensing device;

[0027] Figure 11 A block diagram of a lighting system according to an embodiment of this disclosure is shown.

[0028] [Symbol Explanation]

[0029] 100: Long-range passive infrared sensing device

[0030] 102: Module

[0031] 104: Microcontroller

[0032] 110: Passive Infrared Sensor

[0033] 112: Rectangular sensing area

[0034] 120: Reflector Cup

[0035] 121: Reflective surface

[0036] 122: Cup bottom

[0037] 124: Sidewall

[0038] 126: Sidewall

[0039] 128: Cup rim

[0040] 130: Fresnel lens

[0041] 140: Amplifier

[0042] 150: Comparator

[0043] 160: Circuit board

[0044] 170: Cover

[0045] 180: Stabilized power supply line

[0046] 200: Lighting System

[0047] 210: Light-emitting device

[0048] 3.3V: Voltage contact

[0049] ADC: Converter

[0050] C1~C6: Capacitors

[0051] GND: contact

[0052] IR: Infrared

[0053] L: Dashed line

[0054] O: Signal output port

[0055] P: Contact

[0056] R1~R4: Resistors

[0057] VIN, Vin, Vout: Contacts

[0058] X, Y: Direction

[0059] θ: obtuse angle Detailed Implementation

[0060] The following description of embodiments provides many different implementations, or examples, for carrying out various features of the provided object. Specific examples of elements and arrangements are described below to simplify the subject matter. Of course, these examples are merely illustrative and are not intended to be limiting. Furthermore, element symbols and / or letters may be repeated in various examples. This repetition is for simplicity and clarity and does not in itself specify the relationship between the various embodiments and / or configurations discussed.

[0061] Spatial relative terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for descriptive purposes to describe the relationship between one element or feature and another, as shown in the accompanying drawings. Spatial relative terms are intended to cover different orientations of the apparatus in use or operation other than those shown in the accompanying drawings. The apparatus may be oriented in other ways (rotated 90 degrees or otherwise), and the spatial relative descriptors used herein shall be interpreted accordingly.

[0062] Figure 1A perspective view of a long-range passive infrared sensing device 100 according to an embodiment of the present disclosure is shown. Figure 2 Draw Figure 1 A front view of the long-range passive infrared sensing device 100 after removing the Fresnel lens 130 and housing. See also... Figure 1 and Figure 2 The long-range passive infrared sensing device 100 includes a passive infrared sensor 110, a reflector cup 120, and a Fresnel lens 130. The Fresnel lens 130 covers the passive infrared sensor 110 and the reflector cup 120. The reflector cup 120 is adjacent to the passive infrared sensor 110, for example... Figure 2 The reflector cup 120 is located above the passive infrared sensor 110. The outer surface of the reflector cup 120 is a reflective surface 121. When infrared light enters the long-distance passive infrared sensing device 100 through the Fresnel lens 130, the reflective surface 121 of the reflector cup 120 can reflect the infrared light to the passive infrared sensor 110.

[0063] The human body has a body temperature of approximately 37 degrees Celsius and emits infrared radiation with a wavelength of about 10 μm. After being amplified by a Fresnel lens 130, this radiation is refracted onto the reflective surface 121 of the reflector cup 120 and then focused onto the passive infrared sensor 110. The passive infrared sensor 110 is a pyroelectric element that is sensitive to infrared radiation with a wavelength of 10 μm. When it receives infrared radiation from the human body, causing a temperature change, it loses its charge balance and releases a charge. This charge is then detected and processed by subsequent circuitry to generate a signal. The reflector cup 120 can receive radiation signals (such as infrared radiation) from different angles and distances.

[0064] Figure 3 Draw Figure 2 A block diagram of a long-range passive infrared sensing device 100. See also... Figure 2 and Figure 3 The long-range passive infrared sensing device 100 also includes an amplifier 140 and a comparator 150. The amplifier 140 is electrically connected to the passive infrared sensor 110, and the comparator 150 is electrically connected to the amplifier 140. Infrared light can be focused by the reflector 120 and received by the passive infrared sensor 110. The signal is amplified by the amplifier 140 and compared and filtered by the comparator 150, thereby outputting a signal that can be accepted by the lighting fixture.

[0065] In addition, the long-range passive infrared sensing device 100 also includes a circuit board 160 and a cover 170. The passive infrared sensor 110, amplifier 140, and comparator 150 are located on the circuit board 160. The cover 170 covers the circuit board 160 and has a signal output port O, allowing the passive infrared sensor 110 to output a signal from this port O. Figure 2In the diagram, circuit board 160 is not shown because it is obscured (overlapped) by cover 170. A reflective cup 120 is located on cover 170, with its bottom 122 adjacent to passive infrared sensor 110. The bottom 122 of the reflective cup 120 is located between the cup opening 128 and the passive infrared sensor 110. The reflective cup 120 has opposing side walls 124, 126 extending from the bottom 122, each of which forms an obtuse angle θ with the bottom 122. This design of the reflective cup 120 allows infrared light to be reflected in the direction of the passive infrared sensor 110 (to be reflected into the passive infrared sensor 110). Figures 4 to 6 (Description). Furthermore, variations in the height and angle of the reflector cup 120 can alter the infrared sensing distance and range.

[0066] In some embodiments, the passive infrared sensor 110 has a rectangular sensing area 112. The long side of the rectangular sensing area 112 is parallel to the radial direction (e.g., direction X) of the reflector cup 120, and the short side of the rectangular sensing area 112 is parallel to the axial direction (e.g., direction Y) of the reflector cup 120. In some embodiments, the rectangular sensing area 112 can sense an angle of approximately 138 degrees along direction X, and an angle of approximately 125 degrees along direction Y.

[0067] It should be understood that the component connections, materials, and functions already described will not be repeated, but will be stated in the preceding text. The following description will explain the optical path state when the long-range passive infrared sensing device 100 is in use.

[0068] Figures 4 to 6 Draw Figure 2 A schematic diagram of the light path in which the reflector cup 120 reflects infrared (IR) light to the passive infrared sensor 110. (See attached diagram.) Figure 4 When infrared (IR) passes through Figure 1 After passing through the Fresnel lens 130, the light can be reflected by the reflective surface 121 of the left sidewall 124 of the reflector cup 120 and received by the rectangular sensing area 112 of the passive infrared sensor 110. (See also...) Figure 5 When infrared (IR) passes through Figure 1 After passing through the Fresnel lens 130, the light can be reflected by the reflective surface 121 of the bottom 122 of the reflector cup 120 and received by the rectangular sensing area 112 of the passive infrared sensor 110, or it can be directly incident on the rectangular sensing area 112 of the passive infrared sensor 110. (See also...) Figure 6 When infrared (IR) passes through Figure 1 After passing through the Fresnel lens 130, the light can be reflected by the reflective surface 121 of the side wall 126 on the right side of the reflector cup 120 and received by the rectangular sensing area 112 of the passive infrared sensor 110.

[0069] Figure 7 Draw Figure 1 and Figure 2 A schematic diagram of signal transmission during use of the long-range passive infrared sensing device 100. First, infrared radiation (IR) with a wavelength of approximately 10 μm can be generated by the human body. Then, it passes through a Fresnel lens 130 to reduce interference from ambient light, thereby enhancing and refracting the thermal radiation signal (i.e., infrared IR) to the reflector cup 120. Since the long-range passive infrared sensing device 100 has a reflector cup 120, and the reflector cup 120 is adjacent to the passive infrared sensor 110, the infrared IR can pass through the reflective surface 121 of the reflector cup 120 (see...). Figure 2 The light is reflected to the passive infrared sensor 110 of module 102. In other words, the reflector cup 120 can serve as a component for signal collection, increasing signal strength, and improving sensing distance. After the reflector cup 120 collects light and focuses the infrared IR onto the passive infrared sensor 110, the signal can be amplified by the amplifier 140 of module 102, compared and filtered by the comparator 150 of module 102, and finally output to the lamp.

[0070] Figure 8A A circuit diagram of a regulated power supply line 180 according to an embodiment of the present disclosure is shown. Figure 8B A circuit diagram of a passive infrared sensor 110 and a microcontroller 104 according to an embodiment of this disclosure is shown. See also... Figure 8A and Figure 8B The regulated power supply line 180 provides power to the passive infrared sensor 110 and the microcontroller (MCU) 104, for example, by electrically connecting them via a 3.3V voltage contact. The regulated power supply line 180 includes capacitors C1-C4 and resistor R1. The microcontroller 104 includes capacitors C5 and C6 and resistors R2-R4. When the voltage is current-limited by resistor R1 in the regulated power supply line 180, energy can be stored through capacitors C1 and C2, ensuring that the output voltage remains stable when the power supply voltage fluctuates, and filtering out high-frequency noise in the circuit, further purifying the voltage quality. Furthermore, the energy stored in capacitors C3 and C4 ensures that the output voltage remains stable when the power supply voltage fluctuates, helping to reduce circuit ripple voltage, improve voltage regulation, and effectively smooth voltage fluctuations in the circuit. Therefore, it can significantly reduce voltage fluctuations at the output port, thereby enhancing the stability of the voltage regulator. The passive infrared sensor 110 is a digital pyroelectric sensor; a detailed circuit diagram is shown below. Figure 9A As shown, it has a converter (ADC) to convert the thermal signal (infrared radiation) into a digital signal. The microcontroller 104 is electrically connected to the passive infrared sensor 110 via a 3.3V voltage contact and contact P. The microcontroller 104 may include... Figure 9B Components such as amplifier 140 and comparator 150 are used to process digital signals from the converter ADC.

[0071] Figure 10 Draw Figure 1 and Figure 2 Distance detection data distribution map of the long-range passive infrared sensing device 100. Figure 10 The horizontal axis represents distance, and the dashed line L marks a position 35 meters away from the rectangular sensing area 112 of the passive infrared sensor 110. Through the aforementioned design of the long-range passive infrared sensing device 100 with reflector cup 120, the passive infrared sensor 110 of the long-range passive infrared sensing device 100 can effectively increase the sensing distance to more than 35 meters, i.e., the data point to the right of the dashed line L.

[0072] Figure 11 A block diagram of a lighting system 200 according to an embodiment of this disclosure is shown. The lighting system 200 uses the aforementioned long-range passive infrared sensing device 100. For example, the lighting system 200 includes a light-emitting device 210 and the long-range passive infrared sensing device 100, and the light-emitting device 210 is electrically connected to the long-range passive infrared sensing device 100. The light-emitting device 210 is, for example, an LED light source. When the long-range passive infrared sensing device 100 receives infrared radiation from a human body, the light-emitting device 210 can be illuminated.

[0073] The foregoing outlines the features of several embodiments to enable those skilled in the art to better understand the nature of this disclosure. Those skilled in the art should understand that they can readily use this disclosure as the basis for designing or modifying other processes and structures to achieve the same purposes and / or advantages as the embodiments described herein. Those skilled in the art should also recognize that such equivalent constructions do not depart from the spirit and scope of this disclosure, and that various changes, substitutions, and alterations can be made to them without departing from the spirit and scope of this disclosure.

Claims

1. A long-range passive infrared sensing device, characterized in that, include: A passive infrared sensor; An amplifier is electrically connected to the passive infrared sensor; A comparator is electrically connected to the amplifier; as well as A reflective cup is located adjacent to the passive infrared sensor, wherein the outer surface of the reflective cup is a reflective surface, and the reflective surface of the reflective cup is configured to reflect infrared light to the passive infrared sensor.

2. The long-range passive infrared sensing device as described in claim 1, characterized in that, Also includes: A Fresnel lens covers the passive infrared sensor and the reflector cup.

3. The long-range passive infrared sensing device as described in claim 1, characterized in that, Also includes: A circuit board in which the passive infrared sensor, the amplifier and the comparator are located on the circuit board.

4. The long-range passive infrared sensing device as described in claim 3, characterized in that, Also includes: A cover is provided to cover the circuit board and has a signal output port, from which the passive infrared sensor outputs a signal.

5. The long-range passive infrared sensing device as described in claim 4, characterized in that, The reflective cup is located on the lid, and the bottom of the reflective cup is adjacent to the passive infrared sensor.

6. The long-range passive infrared sensing device as described in claim 5, characterized in that, The bottom of the reflective cup is located between the rim of the reflective cup and the passive infrared sensor.

7. The long-range passive infrared sensing device as described in claim 5, characterized in that, The reflective cup has opposing side walls extending from the bottom of the cup, and each of the side walls forms an obtuse angle with the bottom of the cup.

8. The long-range passive infrared sensing device as described in claim 1, characterized in that, The passive infrared sensor has a rectangular sensing area.

9. The long-range passive infrared sensing device as claimed in claim 8, wherein the long side of the rectangular sensing area is parallel to the radial direction of the reflector cup.

10. The long-range passive infrared sensing device as described in claim 8, characterized in that, The short side of the rectangular sensing area is parallel to the axis of the reflector cup.

11. A lighting system using a long-range passive infrared sensor, characterized in that, The lighting system uses the long-range passive infrared sensing device as described in claim 1.

Images