Ultra-wide-angle passive infrared sensing device and lighting system using same

Abstract

The utility model discloses an ultra-wide-angle passive infrared sensing device and a lighting system using the same. The ultra-wide-angle passive infrared sensing device comprises a circuit board, a first passive infrared sensor and two second passive infrared sensors, the circuit board has a first surface and a second surface opposite to each other. The first passive infrared sensor is located on the first surface of the circuit board and has a first sensing area. The two second passive infrared sensors are located on the second surface of the circuit board and are adjacent to each other. Each of the two second passive infrared sensors is provided with a second sensing area, and the normal direction of the first sensing area is different from the two normal directions of the two second sensing areas. The ultra-wide-angle passive infrared sensing device can effectively improve the infrared sensing angle.

Description

Technical Field

[0001] This disclosure relates to a passive infrared sensing device, and more particularly to an ultra-wide-angle 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, typically around 37 degrees Celsius, and therefore emits infrared radiation with a specific wavelength of approximately 10 μm. Passive infrared sensors can detect this 10 μm 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, passive infrared sensors have a sensing angle of less than or equal to 180 degrees, which is unsuitable for ultra-wide-angle applications. Utility Model Content

[0004] According to some embodiments disclosed herein, an ultra-wide-angle passive infrared sensing device includes a circuit board, a first passive infrared sensor, and two second passive infrared sensors. The circuit board has opposing first and second surfaces. The first passive infrared sensor is located on the first surface of the circuit board and has a first sensing area. The two second passive infrared sensors are located on the second surface of the circuit board and are adjacent to each other. Each of the two second passive infrared sensors has a second sensing area, and the normal direction of the first sensing area is different from the two normal directions of the two second sensing areas.

[0005] In some embodiments, the aforementioned ultra-wide-angle passive infrared sensing device further includes a Fresnel lens. The Fresnel lens covers the circuit board, the first passive infrared sensor, and two second passive infrared sensors.

[0006] In some embodiments, the aforementioned ultra-wide-angle passive infrared sensing device further includes at least one amplifier. The amplifier is located on a circuit board and is electrically connected to the first passive infrared sensor and one of two second passive infrared sensors.

[0007] In some embodiments, the aforementioned ultra-wide-angle passive infrared sensing device further includes at least one comparator. The comparator is located on a circuit board and is electrically connected to an amplifier.

[0008] In some implementations, the two normal directions of the two second sensing areas are perpendicular to each other.

[0009] In some implementations, the normal direction of the first sensing area is perpendicular to the normal directions of the two second sensing areas.

[0010] In some implementations, the normal direction of the first sensing area is perpendicular to the circuit board.

[0011] In some implementations, the two normal directions of the two second sensing areas are parallel to the circuit board.

[0012] In some embodiments, the circuit board has opposing first and second edges, with the first passive infrared sensor closer to the first edge of the circuit board than the two second passive infrared sensors.

[0013] In some implementations, the two second passive infrared sensors are located adjacent to the second edge of the circuit board.

[0014] According to some embodiments of this disclosure, an illumination system using an ultra-wide-angle passive infrared sensing device is provided.

[0015] In the above-disclosed embodiment, since the first passive infrared sensor of the ultra-wide-angle passive infrared sensing device is located on the first surface of the circuit board, and the two second passive infrared sensors are located on the second surface of the circuit board, and the normal direction of the first sensing area is different from the two normal directions of the two second sensing areas, when a human body emits infrared light with a wavelength of approximately 10 μm, even if the human body is tilted relative to the ultra-wide-angle passive infrared sensing device (e.g., more than 180 degrees), the infrared light can still be received by either the first passive infrared sensor or the two second passive infrared sensors. With this configuration, the ultra-wide-angle passive infrared sensing device can increase the sensing angle to over 220 degrees. 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 an ultra-wide-angle passive infrared sensing device according to an embodiment of the present disclosure is shown.

[0018] Figure 2 Draw Figure 1 Front view of the ultra-wide-angle passive infrared sensor after removing the Fresnel lens and housing;

[0019] Figure 3 Draw Figure 2 Top view of an ultra-wide-angle passive infrared sensor;

[0020] Figure 4 Draw Figure 2 Block diagram of an ultra-wide-angle passive infrared sensing device;

[0021] Figure 5 Draw Figure 1 and Figure 2 A schematic diagram of signal transmission during the use of an ultra-wide-angle passive infrared sensing device;

[0022] Figure 6A A circuit diagram of a regulated power supply line according to an embodiment of the present disclosure is shown;

[0023] Figure 6B A circuit diagram of a first passive infrared sensor, a second passive infrared sensor, and a microcontroller according to an embodiment of this disclosure is shown.

[0024] Figure 7A Draw Figure 6B Detailed circuit diagrams of the first passive infrared sensor and the second passive infrared sensor;

[0025] Figure 7B Draw Figure 6B The components included in a microcontroller;

[0026] Figure 8 Draw Figure 1 and Figure 2 Angle detection data distribution map of an ultra-wide-angle passive infrared sensing device;

[0027] Figure 9 A block diagram of a lighting system according to an embodiment of this disclosure is shown.

[0028] [Symbol Explanation]

[0029] 100: Ultra-wide-angle passive infrared sensing device

[0030] 102: Microcontroller

[0031] 110: Circuit board

[0032] 112: First Surface

[0033] 114: Second Surface

[0034] 116: First Edge

[0035] 118: Second Edge

[0036] 120: First passive infrared sensor

[0037] 122: First sensing area

[0038] 130, 130a: Second passive infrared sensor

[0039] 132: Second sensing area

[0040] 140: Fresnel lens

[0041] 150: Amplifier

[0042] 160: Comparator

[0043] 170: Stabilized power supply line

[0044] 200: Lighting System

[0045] 210: Light-emitting device

[0046] 3.3V: Voltage contact

[0047] ADC: Converter

[0048] C1-C6: Capacitors

[0049] D1, D2, D3: Normal direction

[0050] GND: contact

[0051] P: Contact

[0052] R1-R4: Resistors

[0053] VIN, Vin, Vout: Contacts

[0054] X, Y, Z: Direction Detailed Implementation

[0055] The following description of embodiments provides many different implementations, or examples, for carrying out the various features of the provided subject matter. 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.

[0056] 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.

[0057] Figure 1A perspective view of an ultra-wide-angle passive infrared sensing device 100 according to an embodiment of the present disclosure is shown. Figure 2 Draw Figure 1 Front view of the ultra-wide-angle passive infrared sensor 100 after removing the Fresnel lens 140 and housing. See also... Figure 1 and Figure 2 The ultra-wide-angle passive infrared sensing device 100 includes a circuit board 110, a first passive infrared sensor 120, two second passive infrared sensors 130 and 130a, and a Fresnel lens 140. The Fresnel lens 140 covers the circuit board 110, the first passive infrared sensor 120, and the second passive infrared sensors 130 and 130a. The circuit board 110 has opposing first surfaces 112 and second surfaces 114. The first passive infrared sensor 120 is located on the first surface 112 of the circuit board 110 and has a first sensing area 122. The second passive infrared sensors 130 and 130a are located on the second surface 114 of the circuit board 110 and are adjacent to each other. For example, the second passive infrared sensors 130 and 130a may have upright plates inserted into the circuit board 110, and the sidewalls of the two upright plates abut against each other. Each of the second passive infrared sensors 130 and 130a has a second sensing area 132. When infrared light enters the ultra-wide-angle passive infrared sensing device 100 through the Fresnel lens 140, the first sensing area 122 of the first passive infrared sensor 120 and the second sensing area 132 of the second passive infrared sensors 130 and 130a can both receive infrared light.

[0058] 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 140, this radiation is refracted to the first passive infrared sensor 120 and the second passive infrared sensors 130 and 130a. The first passive infrared sensor 120 and the second passive infrared sensors 130 and 130a are pyroelectric elements, which are sensitive to infrared radiation with a wavelength of 10 μm. When they receive infrared radiation from the human body, causing a temperature change, they lose their charge balance and release charges. Therefore, after detection and processing by the subsequent circuitry, a signal can be generated.

[0059] Figure 3 Draw Figure 2 Top view of the ultra-wide-angle passive infrared sensing device 100. See also... Figure 2 and Figure 3The normal directions D1 of the first sensing area 122 of the first passive infrared sensor 120, D2 of the second sensing area 132 of the second passive infrared sensor 130, and D3 of the second sensing area 132 of the second passive infrared sensor 130a are different from each other. This configuration can effectively improve the overall sensing angle range. In some embodiments, the normal direction D1 of the first sensing area 122 may be perpendicular to the circuit board 110. The two normal directions D2 and D3 of the two second sensing areas 132 may be parallel to the circuit board 110. Furthermore, the normal direction D1 of the first sensing area 122 of the first passive infrared sensor 120 may be perpendicular to the two normal directions D2 and D3 of the two second sensing areas 132, and the two normal directions D2 and D3 of the two second sensing areas 132 may be perpendicular to each other. In this way, the normal direction D1 of the first sensing area 122 and the two normal directions D2 and D3 of the two second sensing areas 132 are respectively oriented towards Figure 1 Below, left front and right front of the ultra-wide-angle passive infrared sensor 100.

[0060] In some embodiments, the circuit board 110 has opposing first edges 116 and second edges 118, with the first passive infrared sensor 120 closer to the first edge 116 of the circuit board 110 than the second passive infrared sensors 130, 130a. The second passive infrared sensors 130, 130a are adjacent to the second edge 118 of the circuit board 110.

[0061] Furthermore, the first sensing area 122 and the second sensing area 132 may be rectangular, with the long side of the rectangle capable of sensing an angle of approximately 138 degrees and the short side capable of sensing an angle of approximately 125 degrees, but this is not intended to limit the present disclosure.

[0062] Figure 4 Draw Figure 2 A block diagram of the ultra-wide-angle passive infrared sensing device 100. See also... Figure 2 and Figure 4 The ultra-wide-angle passive infrared sensing device 100 further includes at least one amplifier 150 and at least one comparator 160. Amplifier 150 is located on circuit board 110 and electrically connected to one of the first passive infrared sensor 120 and the second passive infrared sensors 130 and 130a. Comparator 160 is located on circuit board 110 and electrically connected to amplifier 150. Infrared light is received by the first passive infrared sensor 120 and the second passive infrared sensors 130 and 130a, and the signal is amplified by amplifier 150 and compared and filtered by comparator 160, thereby outputting a signal that can be accepted by the lighting fixture.

[0063] 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 signal transmission sequence and circuitry when the ultra-wide-angle passive infrared sensing device 100 is in use.

[0064] Figure 5 Draw Figure 1 and Figure 2 This is a schematic diagram illustrating the signal transmission during the use of the ultra-wide-angle passive infrared sensing device 100. Firstly, infrared light with a wavelength of approximately 10μm can be generated by the human body, and then... Figure 1 The Fresnel lens 140 reduces ambient light interference to enhance and refract thermal radiation signals (i.e., infrared rays) to the first passive infrared sensor 120 and the second passive infrared sensors 130, 130a. Since the first passive infrared sensor 120 of the ultra-wide-angle passive infrared sensing device 100 is located on the first surface 112 of the circuit board 110 (see...) Figure 2 On the circuit board 110, the second passive infrared sensors 130 and 130a are located on the second surface 114 (see...). Figure 2 ) on, and Figure 2 The normal direction D1 of the first sensing area 122 and Figure 3 The normal directions D2 and D3 of the two second sensing areas 132 are different from each other. Therefore, when a human body emits infrared light with a wavelength of about 10 μm, even if the human body is tilted relative to the ultra-wide-angle passive infrared sensing device 100 (for example, more than 180 degrees), the infrared light can still be received by either the first passive infrared sensor 120 or the second passive infrared sensors 130 and 130a. After the first passive infrared sensor 120 and the second passive infrared sensors 130 and 130a receive the infrared light, the signal can be amplified by the amplifier 150, compared and filtered by the comparator 160, and finally output to the lamp.

[0065] Figure 6A A circuit diagram of a regulated power supply line 170 according to an embodiment of the present disclosure is shown. Figure 6B A circuit diagram illustrating a first passive infrared sensor 120, second passive infrared sensors 130, 130a, and a microcontroller 102 according to an embodiment of this disclosure is shown. See also... Figure 6A and Figure 6BThe regulated power supply line 170 provides power to the first passive infrared sensor 120, the second passive infrared sensor 130, 130a, and the microcontroller 102 (MCU), for example, by electrically connecting them via a 3.3V voltage contact. The regulated power supply line 170 includes capacitors C1-C4 and resistor R1. The microcontroller 102 includes capacitors C5 and C6 and resistors R2-R4. When the voltage is current-limited by resistor R1 in the regulated power supply line 170, 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 first passive infrared sensor 120 and the second passive infrared sensors 130 and 130a are digital pyroelectric sensors. Detailed circuit diagrams are shown below. Figure 7A As shown, it has a converter (ADC) to convert thermal signals (infrared radiation) into digital signals. The microcontroller 102 is electrically connected to a first passive infrared sensor 120 and second passive infrared sensors 130, 130a via a 3.3V voltage contact and contact P. The microcontroller 102 may include... Figure 7B Components such as amplifier 150 and comparator 160 are used to process digital signals from the converter ADC.

[0066] Figure 8 Draw Figure 1 and Figure 2 An angular detection data distribution map of an ultra-wide-angle passive infrared sensing device with an angle of 100. Figure 8 Two adjacent straight lines along the radial direction represent an angular difference of 5 degrees. Through the aforementioned design of the ultra-wide-angle passive infrared sensing device 100 with a first passive infrared sensor 120 and second passive infrared sensors 130 and 130a, the ultra-wide-angle passive infrared sensing device 100 can effectively increase the sensing angle to over 220 degrees, such as when located in... Figure 8 Data points on the left.

[0067] Figure 9 A block diagram of a lighting system 200 according to an embodiment of this disclosure is shown. The lighting system 200 uses the aforementioned ultra-wide-angle passive infrared sensor 100. For example, the lighting system 200 includes a light-emitting device 210 and the ultra-wide-angle passive infrared sensor 100, and the light-emitting device 210 is electrically connected to the ultra-wide-angle passive infrared sensor 100. The light-emitting device 210 is, for example, an LED light source. When the ultra-wide-angle passive infrared sensor 100 receives infrared radiation from a human body, the light-emitting device 210 can be illuminated.

[0068] 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. An ultra-wide-angle passive infrared sensing device, characterized in that, Comprising: a circuit board having a first surface and a second surface opposite to each other; a first passive infrared sensor located on the first surface of the circuit board and having a first sensing area; and two second passive infrared sensors located on the second surface of the circuit board and adjacent to each other, wherein each of the two second passive infrared sensors has a second sensing area, and a normal direction of the first sensing area and two normal directions of the two second sensing areas are different from each other.

2. The ultra-wide-angle passive infrared sensing device of claim 1, wherein, Further comprising: a Fresnel lens covering the circuit board, the first passive infrared sensor and the two second passive infrared sensors.

3. The ultra-wide-angle passive infrared sensing device of claim 1, wherein, Further comprising: at least one amplifier located on the circuit board and electrically connected to the first passive infrared sensor and one of the two second passive infrared sensors.

4. The ultra-wide-angle passive infrared sensing device of claim 3, wherein, Further comprising: at least one comparator located on the circuit board and electrically connected to the amplifier.

5. The ultra-wide-angle passive infrared sensing device of claim 1, wherein, The two normal directions of the two second sensing areas are perpendicular to each other.

6. The ultra-wide-angle passive infrared sensing device of claim 1, wherein, The normal direction of the first sensing area is perpendicular to the two normal directions of the two second sensing areas.

7. The ultra-wide-angle passive infrared sensing device of claim 1, wherein, The normal direction of the first sensing area is perpendicular to the circuit board.

8. The ultra-wide-angle passive infrared sensing device of claim 1, wherein, The two normal directions of the two second sensing areas are parallel to the circuit board.

9. The ultra-wide-angle passive infrared sensing device of claim 1, wherein, The circuit board has a first edge and a second edge opposite to each other, and the first passive infrared sensor is closer to the first edge of the circuit board than the two second passive infrared sensors.

10. The ultra-wide-angle passive infrared sensing device of claim 9, wherein, The two second passive infrared sensors are adjacent to the second edge of the circuit board.

11. A lighting system using ultra-wide-angle passive infrared sensing devices, characterized by, The lighting system uses the ultra-wide passive infrared sensing device of claim 1.

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