CN211293299U - Infrared detection circuit - Google Patents
Infrared detection circuit Download PDFInfo
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- CN211293299U CN211293299U CN202020340532.0U CN202020340532U CN211293299U CN 211293299 U CN211293299 U CN 211293299U CN 202020340532 U CN202020340532 U CN 202020340532U CN 211293299 U CN211293299 U CN 211293299U
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- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 238000010586 diagram Methods 0.000 description 4
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Abstract
The utility model provides an infrared detection circuit. The infrared detection circuit comprises a control circuit and an infrared receiving and transmitting circuit connected with the control circuit, wherein the infrared receiving and transmitting circuit comprises at least one infrared transmitting tube and at least one infrared receiving tube. The control circuit sends a first control signal to the infrared transmitting tube periodically at preset time intervals; the infrared transmitting tube is turned on under the control of the first control signal to transmit an infrared light signal and is turned off after a first predetermined period of time; and the control circuit detects the state of the infrared receiving tube to determine whether the infrared receiving tube receives the infrared light signal reflected by the living body. By periodically controlling the infrared emission tube to be turned on and off, the infrared detection circuit achieves low power consumption.
Description
Technical Field
The utility model relates to an electronic circuit field, more specifically relates to an infrared detection circuit of low-power consumption.
Background
Currently, many applications based on human perception are to first detect the presence or proximity of a living body using an infrared detection technique, and then to further perform a corresponding application on the living body when the living body is detected. For example, in a face recognition application such as an entrance guard, an airport, a station, or the like, the presence of a human body is first detected by an infrared detection circuit, and then the detected face is recognized by the face recognition application. However, in these applications, the infrared detection circuit is usually in a normally open state, which increases the power consumption of the entire system. Furthermore, the applications (workloads) associated with the infrared detection circuit are also typically in a normally open state, which further increases power consumption, especially in the case of power-hungry applications.
SUMMERY OF THE UTILITY MODEL
To the problem, the utility model provides an infrared detection circuit of low-power consumption.
According to an aspect of the utility model, an infrared detection circuit is provided. The infrared detection circuit comprises a control circuit and an infrared receiving and transmitting circuit connected with the control circuit, wherein the infrared receiving and transmitting circuit comprises at least one infrared transmitting tube and at least one infrared receiving tube. The control circuit sends a first control signal to the infrared transmitting tube periodically at preset time intervals; the infrared transmitting tube is turned on under the control of the first control signal to transmit an infrared light signal and is turned off after a first predetermined period of time; and the control circuit detects the state of the infrared receiving tube to determine whether the infrared receiving tube receives the infrared light signal reflected by the living body.
In some implementations, the first predetermined period of time is less than or equal to 1% of the predetermined time interval.
In some implementations, the predetermined time interval is 100 to 500 milliseconds and the first predetermined time period is 1 to 5 milliseconds.
In some implementations, the infrared detection circuit further includes a controllable power supply, and the control circuit controls the controllable power supply to turn on to supply power to a work load connected to the controllable power supply if it is determined that the infrared receiving tube receives the infrared light signal reflected by the living body.
In some implementations, the workload is a high energy consuming workload.
In some implementations, the workload includes a 3D binocular camera module.
In some implementations, the control circuit periodically sends a second control signal to the infrared receiving tube at the predetermined time interval, the infrared receiving tube is turned on to receive the infrared light signal reflected by the living body under the control of the second control signal and is turned off after a second predetermined time period, wherein the second predetermined time period is greater than the first predetermined time period.
In some implementations, the second control signal is transmitted simultaneously with the first control signal.
In some implementations, the second control signal is sent earlier than the first control signal.
Utilize the utility model discloses a scheme opens and closes infrared transmitting tube through the periodicity, has not only reduced the consumption of infrared transceiver circuit self, but also can further reduce the power consumption of the work load that links to each other with it.
Drawings
Fig. 1 shows a block diagram of an infrared detection circuit according to an embodiment of the present invention;
fig. 2A illustrates a circuit schematic of an infrared transceiver circuit in accordance with some embodiments of the present invention;
fig. 2B shows a circuit schematic of an infrared transceiver circuit according to further embodiments of the present invention;
fig. 3 shows a circuit schematic of a control circuit according to an embodiment of the invention; and
fig. 4 shows an operation timing diagram of the infrared transceiver circuit according to the embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.
In the following description, for the purposes of illustrating various utility embodiments, certain specific details are set forth in order to provide a thorough understanding of the various utility embodiments. One skilled in the relevant art will recognize, however, that the embodiments may be practiced without one or more of the specific details. In other instances, well-known devices, structures and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.
Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the terms first, second and the like used in the description and the claims are used for distinguishing objects for clarity, and do not limit the size, other order and the like of the described objects.
Fig. 1 shows a block diagram of an infrared detection circuit 1 according to an embodiment of the present invention. As shown in fig. 1, the infrared detection circuit 1 includes a control circuit 10 and an infrared transceiver circuit 20 connected thereto. The infrared transceiver circuit 20 includes at least one infrared transmitting tube 22 and at least one infrared receiving tube 24.
Fig. 2A illustrates a circuit schematic of an infrared transceiver circuit 20 according to some embodiments of the present invention. As shown in fig. 2A, the infrared transceiver circuit 20 includes a pair of infrared transmitting tubes 22 and an infrared receiving tube 24.
Fig. 2B shows a circuit schematic of the infrared transceiver circuit 20 according to further embodiments of the present invention. As shown in fig. 2B, the infrared transceiver circuit 20 includes two infrared transmitting tubes 22 and two infrared receiving tubes 24. It should be noted that in practical applications, the infrared transceiver circuit 20 further includes peripheral circuits, such as the capacitor C9, the resistors R2, R4 and R5, the power supply terminal MCU _ VDD and the ground terminal GND shown in fig. 2A and 2B, however, the arrangement of these peripheral circuits is well known to those skilled in the art and will not be described herein. Parameters of the respective elements of the peripheral circuit are not shown in fig. 2A and 2B, and in a typical infrared detection circuit, the capacitor C9 may be 1 μ F, and the resistors R2, R4, and R5 may be 20 Ω, 1K Ω, and 2K Ω, respectively.
The infrared emission tube 22 may be, for example, an infrared light emitting diode capable of emitting infrared light having a wavelength of greater than 760 nm. The infrared receiving tube 24 may be, for example, a triode, as shown in fig. 2A and 2B. The infrared receiving tube 24 undergoes a significant change in voltage between the collector and emitter upon receiving infrared light, and thus undergoes a significant change in level of its output (PS _ INT shown in fig. 2A and 2B) so that it is possible to determine whether the infrared receiving tube 24 receives infrared light by detecting the output of the infrared receiving tube 24.
Depending on the back-end application (workload), ir transmitting tube 22 and ir receiving tube 24 operating in different ir bands may be used, such as 850nm, 875nm, 940nm bands, etc.
In some embodiments, IR transceiver circuit 20 may further include a voltage comparator circuit 26 for detecting whether the output (PS _ INT) of IR receiving tube 24 reaches a predetermined threshold, and transmitting to control circuit 10 only when the output PS _ INT reaches the predetermined threshold (described below). In some embodiments, the voltage comparator circuit 26 includes an operational amplifier U4, as shown.
Note that although the voltage comparator circuit 26 is shown and described herein as being part of the infrared transceiver circuit 20, in some other embodiments, the voltage comparator circuit 26 may be built into the control circuit 10. In this case, the control circuit 10 receives the output PS _ INT of the infrared receiving tube 24, for example, through the PIN12, and determines whether the output PS _ INT is greater than or equal to a predetermined threshold. If it is determined that the output PS _ INT is greater than or equal to the predetermined threshold, the control circuit 10 determines that the infrared receiving tube 24 has received infrared light.
Fig. 3 shows a circuit schematic of the control circuit 10 according to an embodiment of the present invention. The control circuit 10 may be a programmable Microcontroller (MCU) or other control chip. Fig. 3 exemplarily shows respective pins and peripheral circuits of the control circuit 10. As shown in fig. 2A, 2B and 3, PIN6 is used to send a control signal IR _ CTRL to IR-emitting tube 22 to control the opening and closing of IR-emitting tube 22, PIN13 is used to send a control signal PT _ CTRL to IR-receiving tube 24 to control the opening and closing of IR-receiving tube 24, and PIN12 is used to receive the output PS _ INT of IR-receiving tube 24 to determine the status of IR-receiving tube 24 to determine whether IR-receiving tube 24 receives IR light. Further, in some embodiments, PIN2 may be used to send a control signal EN _ N163 to controllable power supply 30 to power workload 40, and PIN3 may be used to receive a status indication from workload 40 to indicate whether workload 40 completed a work task. It will be appreciated by those skilled in the art that the pin arrangement described above is merely exemplary and the invention is not limited to the specific pin arrangement described above.
In an embodiment according to the present invention, the control circuit 10 periodically sends the first control signal IR _ CTRL to the infrared emission tube 22 at predetermined time intervals T1. For example, the control circuit 10 may be programmed to wake up periodically to send the control signal. The control signal IR _ CTRL may include, for example, a parameter for turning on the infrared emission tube 22 and a parameter for indicating the duration of the turning on of the infrared emission tube 22.
The infrared transmitting tube 22 is turned on to transmit an infrared light signal under the control of the first control signal IR _ CTRL and may be turned off after a first predetermined period of time T2, thereby generating a periodically transmitted infrared light signal.
Fig. 4 shows an operation timing diagram of the infrared transceiver circuit 20 according to an embodiment of the present invention. The operation timing chart shown in fig. 4 can be simultaneously viewed as a timing chart of the first control signal periodically transmitted by the control circuit 10 and a timing chart of the turning on and off of the infrared emission tube 22, without considering the time delay between the elements.
In some embodiments, the first predetermined time period T2 is less than or equal to 1% of the predetermined time interval T1. Preferably, the infrared emission tube 22 can be opened 2 to 10 times per second. In this case, the predetermined time interval T1 may be 100 to 500 milliseconds, and the first predetermined time period may be 1 to 5 milliseconds. By configuring the ir transceiver circuit 20, and in particular the ir transmitting tube 22, to be periodically turned on and off, power consumption is greatly reduced as compared to prior art schemes in which the ir transceiver circuit is normally open.
The control circuit 10 detects the state of the infrared receiving tube 24 to determine whether the infrared receiving tube 24 receives the infrared light signal reflected by the living body. In the case where a living body exists at a predetermined distance of the infrared transceiver circuit 20, the infrared light emitted from the infrared transmitting tube 22 can be reflected by the living body and received by the infrared receiving tube 24. When receiving the reflected infrared light, infrared receiving tube 24 changes the level of its output PS _ INT. The control circuit 10 can determine whether the infrared receiving tube 24 receives the infrared light signal reflected by the living body, for example, by detecting whether the level at the PIN12 connected to the output PS _ INT has changed.
In the default state, controllable power supply 30 is in an off state and does not supply power to workload 40. If the control circuit 10 determines that the infrared receiving tube 24 receives the infrared light signal reflected by the living body, the control circuit 10 controls the controllable power supply 30 to be turned on to supply power to the work load 40 connected to the controllable power supply 30. Otherwise, the infrared transceiver circuit 20 does not operate, and waits for the control circuit 10 to wake up again and send a control signal to the control circuit. In some embodiments, the workload 40 is a high energy consuming workload. For example, the workload 40 may include a 3D binocular camera module, which may be used to further perform 3D face recognition applications. After the 3D face recognition is performed, further operations may be performed according to the recognition result. For example, in an entrance guard application, the entrance guard system may be opened when the identification passes, and when the identification fails, the infrared receiving tube 24 returns to wait for the next time to receive the infrared light signal reflected by the living body, and at the same time, a prompt message such as "identification fails" may be issued. For another example, in an airport identification application, the user may be allowed to pass through when the identification passes, and when the identification does not pass, return to wait for the next time the infrared receiving tube 24 receives the infrared light signal reflected by the living body, while a prompt such as "identification does not pass" may be issued. By causing the power to be supplied to the workload 40 only when the presence of a living body is detected, the power consumption of the workload 40 can be further reduced.
Further, the control of the infrared receiving tube 24 by the control circuit 10 may be simultaneous with or in advance of the control of the infrared transmitting tube 22.
Specifically, the control circuit 10 periodically sends the second control signal PT _ CTRL to the infrared receiving tube 24 at the predetermined time interval T1, and the infrared receiving tube 24 is turned on under the control of the second control signal PT _ CTRL to receive the infrared light signal reflected by the living body, and is turned off after a second predetermined time period (not shown in the figure). Wherein the second predetermined period of time is greater than the first predetermined period of time T2. By setting the on-duration of the infrared receiving tube 24 to be longer than the infrared transmitting tube 22, it can be ensured that reflected infrared light is not missed to be received, and a miss-judgment is avoided.
In some embodiments, the second control signal PT _ CTRL is simultaneous with the first control signal IR _ CTRL. That is, the infrared transmitting tube 22 and the infrared receiving tube 24 are simultaneously opened. In this case, the first control signal IR _ CTRL and the second control signal PT _ CTRL may also be the same control signal, and the control unit 10 may send the control signal to the infrared emission tube 22 and the infrared reception tube 24 simultaneously through the same pin, for example.
In other embodiments, the second control signal PT _ CTRL is earlier than the first control signal IR _ CTRL. That is, the infrared receiving tube 24 is opened earlier than the infrared transmitting tube 22. In this way, the infrared receiving tube 24 can be further prevented from missing the reflected infrared light and avoiding missing the judgment.
The utility model discloses can realize as electronic equipment, chip circuit etc.. The chip circuitry may include circuitry for performing various aspects of the present invention.
While various embodiments of the present invention have been described above, the above description is intended to be illustrative, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (9)
1. The utility model provides an infrared detection circuit, includes control circuit and the infrared transceiver circuit who links to each other with it, infrared transceiver circuit includes at least one infrared transmitting tube and at least one infrared receiving tube, its characterized in that:
the control circuit sends a first control signal to the infrared emission tube periodically at preset time intervals;
the infrared emission tube is turned on under the control of the first control signal to emit an infrared light signal and is turned off after a first predetermined period of time; and
the control circuit detects a state of the infrared receiving tube to determine whether the infrared receiving tube receives an infrared light signal reflected by a living body.
2. The infrared detection circuit of claim 1, wherein the first predetermined period of time is less than or equal to 1% of the predetermined time interval.
3. The infrared detection circuit as set forth in claim 1, wherein said predetermined time interval is 100 to 500 milliseconds and said first predetermined time period is 1 to 5 milliseconds.
4. The infrared detection circuit as set forth in claim 1, wherein the infrared detection circuit further comprises a controllable power supply, and the control circuit controls the controllable power supply to be turned on to supply power to a work load connected to the controllable power supply if it is determined that the infrared receiving tube receives the infrared light signal reflected by the living body.
5. The infrared detection circuit of claim 4, wherein the workload is a high energy consuming workload.
6. The infrared detection circuit of claim 5, wherein the workload comprises a 3D binocular camera module.
7. The infrared detection circuit of claim 1,
the control circuit sends a second control signal to the infrared receiving tube periodically at the preset time interval;
the infrared receiving tube is turned on under the control of the second control signal to receive the infrared light signal reflected by the living body and is turned off after a second predetermined period of time;
wherein the second predetermined period of time is greater than the first predetermined period of time.
8. The infrared detection circuit of claim 7,
the second control signal is transmitted simultaneously with the first control signal.
9. The infrared detection circuit of claim 7,
the second control signal is transmitted earlier than the first control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020340532.0U CN211293299U (en) | 2020-03-18 | 2020-03-18 | Infrared detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020340532.0U CN211293299U (en) | 2020-03-18 | 2020-03-18 | Infrared detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211293299U true CN211293299U (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020340532.0U Active CN211293299U (en) | 2020-03-18 | 2020-03-18 | Infrared detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211293299U (en) |
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2020
- 2020-03-18 CN CN202020340532.0U patent/CN211293299U/en active Active
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