Search

CN-224202570-U - Passive infrared detection device capable of shortening power-on time

CN224202570UCN 224202570 UCN224202570 UCN 224202570UCN-224202570-U

Abstract

The utility model provides a passive infrared detection device capable of shortening the power-on time, which comprises a pyroelectric infrared sensor and a primary amplifying circuit, wherein the primary amplifying circuit is provided with an operational amplifier OP 1 , a feedback resistor R 1 and a first series RC circuit, the inverting input end of the operational amplifier OP 1 is connected with the output end of the operational amplifier OP 1 through the feedback resistor R 1 , and is electrically connected with the signal output end of the pyroelectric infrared sensor through the first series RC circuit, the non-inverting input end of the operational amplifier OP 1 is connected with a direct current bias voltage Vref 1 , the direct current bias voltage Vref 1 is set to be the same as the direct current bias voltage Vrefin of the inverting input end of the operational amplifier OP 1 through the first series RC circuit within the difference range of less than or equal to 0.5V, so that the output of the output end of the operational amplifier OP 1 can quickly tend to be stable, and the power-on time of the amplifying circuit is shortened.

Inventors

  • ZOU GAODI
  • SUN YI

Assignees

  • 深圳迈睿智能科技有限公司

Dates

Publication Date
20260505
Application Date
20250522

Claims (15)

  1. 1. Can shorten the passive infrared detection device of power-on time, its characterized in that includes: A pyroelectric infrared sensor, and The amplifying circuit takes an inverse negative feedback amplifying circuit as a primary amplifying circuit, and is provided with an operational amplifier OP 1 , a feedback resistor R 1 and a first series RC circuit corresponding to the primary amplifying circuit, wherein the output end of the operational amplifier OP 1 is connected with the inverse input end of the operational amplifier OP 1 through the feedback resistor R 1 , the inverse input end of the operational amplifier OP 1 is electrically connected with the signal output end of the pyroelectric infrared sensor through the first series RC circuit so as to be connected with a detection signal output from the signal output end of the pyroelectric infrared sensor, the non-inverting input end of the operational amplifier OP 1 is connected with a direct current bias voltage Vref 1 , and the direct current bias voltage Vref 1 is set to be the same as the direct current bias voltage Vrefin which the operational amplifier OP 1 is connected with the inverse input end through the first series RC circuit within a difference range of less than or equal to 0.5V.
  2. 2. The passive infrared detection device as set forth in claim 1, wherein said amplifying circuit is configured to provide said dc bias voltage Vref 1 to said non-inverting input of said operational amplifier OP 1 of said primary amplifying circuit with a first voltage dividing circuit having a first voltage dividing resistor and a first ground resistor, wherein one end of said first ground resistor is grounded and the other end of said first ground resistor is connected to a dc supply voltage via said first voltage dividing resistor, and said non-inverting input of said operational amplifier OP 1 of said primary amplifying circuit is electrically connected between said first voltage dividing resistor and said first ground resistor.
  3. 3. The passive infrared detection device as set forth in claim 1, wherein said primary amplification circuit is configured to have a high pass cutoff frequency below 0.3 Hz.
  4. 4. A passive infrared detection device according to any one of claims 1 to 3, wherein the operational amplifier OP 1 is arranged to be powered with a single power supply.
  5. 5. The passive infrared detection device as set forth in claim 4, wherein said amplifying circuit further comprises a boost voltage divider circuit, wherein said boost voltage divider circuit has a voltage divider resistor and a voltage matching resistor, wherein an inverting input terminal of said operational amplifier OP 1 is electrically connected to a signal output terminal of said pyroelectric infrared sensor via said first series RC circuit and said voltage matching resistor, and is connected to a dc supply voltage via said first series RC circuit and said voltage divider resistor.
  6. 6. The passive infrared detection device as set forth in claim 5, wherein said voltage matching resistor of said boost voltage divider circuit is further connected in parallel with a capacitance.
  7. 7. The passive infrared detection device as set forth in claim 4, wherein said amplifying circuit further comprises a voltage boosting and dividing circuit, wherein said voltage boosting and dividing circuit has a voltage dividing resistor, a ground resistor and a blocking capacitor, wherein one end of said ground resistor is grounded, the other end of said ground resistor is connected to a dc power supply voltage via said voltage dividing resistor, and is electrically connected to a signal output terminal of said pyroelectric infrared sensor via said blocking capacitor, wherein said operational amplifier OP 1 is electrically connected between said voltage dividing resistor and said ground resistor via said first series RC circuit at an inverting input terminal.
  8. 8. A passive infrared detection apparatus as claimed in claim 1 or claim 3 wherein said operational amplifier OP 1 is arranged to be powered by a dual power supply.
  9. 9. The passive infrared detection device as set forth in claim 8, wherein said amplifying circuit further comprises a step-down voltage divider circuit, wherein said step-down voltage divider circuit has a voltage divider resistor and a voltage matching resistor, wherein an inverting input terminal of said operational amplifier OP 1 is electrically connected to a signal output terminal of said pyroelectric infrared sensor via said first series RC circuit and said voltage matching resistor, and is connected to a negative dc supply voltage via said first series RC circuit and said voltage divider resistor.
  10. 10. The passive infrared detection device as set forth in claim 9, wherein said operational amplifier OP 1 has its non-inverting input grounded.
  11. 11. The passive infrared detection device as set forth in claim 8, wherein said amplifying circuit further comprises a step-down voltage divider circuit, wherein said step-down voltage divider circuit has a positive voltage divider resistor, a negative voltage divider resistor and a blocking capacitor, wherein one end of said negative voltage divider resistor is connected to a negative dc supply voltage, the other end of said negative voltage divider resistor is connected to a positive dc supply voltage via said positive voltage divider resistor, and is electrically connected to a signal output terminal of said pyroelectric infrared sensor via said blocking capacitor, wherein said operational amplifier OP 1 is electrically connected between said positive voltage divider resistor and said negative voltage divider resistor via said first series RC circuit at an inverting input terminal.
  12. 12. The passive infrared detection device as set forth in claim 11, wherein said operational amplifier OP 1 has its non-inverting input grounded.
  13. 13. A passive infrared detection device according to any one of claims 1 to 3, wherein the amplifying circuit uses an inverting negative feedback amplifying circuit as a secondary amplifying circuit, and the secondary amplifying circuit comprises an operational amplifier OP 2 , a feedback resistor R 2 and a second series RC circuit, wherein the output end of the operational amplifier OP 2 is connected to the inverting input end of the operational amplifier OP 2 through the feedback resistor R 2 , and the inverting input end of the operational amplifier OP 2 is electrically connected to the output end of the operational amplifier OP 1 through the second series RC circuit to be connected to the detection signal amplified by the primary amplifying circuit.
  14. 14. The passive infrared detection device as set forth in claim 13, wherein said operational amplifier OP 2 has a dc bias voltage Vref 2 connected to its non-inverting input, said dc bias voltage Vref 2 connected to its non-inverting input of said operational amplifier OP 2 being set to be approximately the same as said dc bias voltage Vref 1 connected to its non-inverting input of said operational amplifier OP 1 within a difference of 0.5V or less.
  15. 15. The passive infrared detection device as set forth in claim 13, wherein said amplifying circuit is configured to provide said dc bias voltage Vref 2 to said non-inverting input of said operational amplifier OP 2 of said secondary amplifying circuit with a second voltage divider circuit having a second voltage divider resistor and a second ground resistor, wherein one end of said second ground resistor is grounded and the other end of said second ground resistor is connected to a dc supply voltage via said second voltage divider resistor, and said non-inverting input of said operational amplifier OP 2 of said secondary amplifying circuit is electrically connected between said second voltage divider resistor and said second ground resistor.

Description

Passive infrared detection device capable of shortening power-on time Technical Field The utility model relates to the field of infrared detection, in particular to a passive infrared detection device capable of shortening power-on time. Background With the development of the internet of things and the popularization of low-carbon environment protection concepts, the requirements of artificial intelligence, intelligent home and intelligent security technology on environment detection, especially on mobile detection of people, are increasing, so as to control corresponding electrical equipment based on the detection result of the existence of the human body to realize intelligent control of the working state of the electrical equipment, for example, to control the illumination state of a lamp based on the detection result of the existence of the human body to realize intelligent low-carbon illumination. The passive infrared detection technology is a relatively mature human existence detection technology in the existing human existence detection technology, the detection principle is that a pyroelectric infrared sensor (PIR) is used for detecting the cross-region action of a human body in a detection region based on the partitioning of a corresponding detection region by a multi-window lens, and the passive infrared detection technology has the advantages of low cost and being capable of accurately setting the detection angle based on the structural design of the multi-window lens, does not violate the privacy of the human, and therefore the detection technology becomes the human existence detection technology which is most commonly used at present. Regarding the detection principle of the passive infrared detection technology, it is generally considered that, as the detection distance increases, the detected human body is far from the infrared detection device adopting the passive infrared detection technology, on one hand, the capturing amount of the infrared light radiated by the detected human body by the pyroelectric infrared sensor is reduced to reduce the intensity of an effective signal related to the human body trans-regional action in the detection signal, and on the other hand, the areas of all subareas in the detection area are large and dispersed, namely, the number of subareas in a unit area is reduced to reduce the resolution of the infrared detection device. Therefore, in the product design thought of the existing infrared detection device, for the purpose of increasing distance detection, it is generally required to increase the window area in the multi-window lens to ensure the signal intensity associated with the human body transregional action in the detection signal, and increase the number of windows in the multi-window lens to ensure the resolution of the infrared detection device, and in the signal processing rule of the detection signal, based on the experience cognition of the frequency component of the effective signal corresponding to the human body transregional motion in the detection signal, it is considered that the energy of the actual effective signal is concentrated at 0.3 Hz-10 Hz, and the energy duty ratio of the effective signal lower than 0.3Hz is extremely low, and can be reduced in intensity along with the increase of the detection distance, and when the frequency lower than 0.3Hz is the high-pass cut-off frequency of the amplifying circuit of the infrared detection device, the energy duty ratio of the effective signal is neither improved, and the risk of drifting is generated due to the approach of the high-pass cut-off frequency to the direct current component, so that the energy of the effective signal is usually at the high-pass cut-off frequency higher than or equal to 0.3 Hz. However, in the trend of reasonable product size limitation and miniaturization, since the window area and the number of windows of the multi-window lens cannot be lifted at the same time, under the signal processing rule of the detection signal, even if the multi-window lens with the diameter of up to 80mm is adopted in the existing infrared detection device, the furthest detection distance is difficult to exceed 12 meters. Disclosure of utility model An object of the present utility model is to provide a passive infrared detection device capable of shortening a power-on time, wherein the passive infrared detection device can reduce a window area and a window number requirement of a multi-window lens when being applied to a long-distance detection, and is correspondingly beneficial to realizing the long-distance detection application with a smaller size of the multi-window lens, so that the passive infrared detection device is suitable for a trend of miniaturized products. Another object of the present utility model is to provide a passive infrared detection device capable of shortening a power-on time, where the passive infrared detection device uses a characteristic that a detection signa