CN115657151A - Infrared correlation detection circuit and infrared sensor - Google Patents
Infrared correlation detection circuit and infrared sensor Download PDFInfo
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- CN115657151A CN115657151A CN202211654462.6A CN202211654462A CN115657151A CN 115657151 A CN115657151 A CN 115657151A CN 202211654462 A CN202211654462 A CN 202211654462A CN 115657151 A CN115657151 A CN 115657151A
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Abstract
The invention discloses an infrared correlation detection circuit and an infrared sensor, wherein the circuit comprises: the switching unit is used for generating a power supply signal with a preset frequency according to the PWM control signal with the preset frequency, and the preset frequency is not less than a specified frequency; the constant current control unit is used for generating a constant current based on the power supply signal and outputting the constant current to the infrared emission tube so as to enable the infrared emission tube to generate an infrared signal with a preset frequency; the receiving unit is used for receiving only the infrared signal and generating a first alternating current signal based on the infrared signal; an amplifying unit for amplifying the first alternating current signal into a second alternating current signal; and the rectification unit is used for converting the second alternating current signal into a direct current signal, outputting the direct current signal to the ADC sampling module, enabling the infrared transmitting tube to generate an infrared signal with preset frequency based on the PWM control signal, and enabling the infrared receiving tube to only receive the infrared signal with the preset frequency, so that the interference of external light can be avoided, and further more accurate infrared correlation detection can be carried out.
Description
Technical Field
The application relates to the technical field of infrared detection, in particular to an infrared correlation detection circuit and an infrared sensor.
Background
In the existing infrared correlation detection technology, an infrared transmitting tube in an infrared sensor emits infrared light, an infrared receiving tube receives the infrared light and then generates corresponding current, when a shielding object exists between the infrared transmitting tube and the infrared receiving tube, the current can generate corresponding change, and the shielding object can be sensed according to the change of the current.
However, the infrared sensor is greatly affected by external light, and the infrared sensor cannot be normally used due to interference of the external light.
Therefore, how to provide an infrared correlation detection circuit capable of avoiding interference of external light is a technical problem to be solved at present.
Disclosure of Invention
The embodiment of the application provides an infrared correlation detection circuit and an infrared sensor for avoid the interference of external light when carrying out infrared correlation detection.
In a first aspect, an infrared correlation detection circuit is provided, the circuit comprising:
the switching unit is used for generating a power supply signal with a preset frequency according to a PWM control signal with the preset frequency, and the preset frequency is not less than a specified frequency;
the constant current control unit is used for generating a constant current based on the power supply signal and outputting the constant current to the infrared emission tube so as to enable the infrared emission tube to generate an infrared signal with the preset frequency;
the receiving unit is used for receiving the infrared signal only and generating a first alternating current signal based on the infrared signal;
an amplifying unit for amplifying the first alternating current signal into a second alternating current signal;
the rectifying unit is used for converting the second alternating current signal into a direct current signal and outputting the direct current signal to the ADC sampling module;
the first end of the switch unit is an input end of the PWM control signal, the second end of the switch unit is connected with a 5V power supply, the third end of the switch unit is connected with the first end of the constant current control unit, the second end of the constant current control unit is an output end of constant current, the first end of the receiving unit is connected with the 5V power supply, the second end of the receiving unit is connected with the first end of the amplifying unit, the second end of the amplifying unit is connected with the first end of the rectifying unit, and the second end of the rectifying unit is an output end of the direct current signal.
In a second aspect, an infrared sensor is provided, which includes the infrared correlation detection circuit as described in the first aspect.
Through using above technical scheme, infrared correlation detection circuitry includes: the switching unit is used for generating a power supply signal with a preset frequency according to the PWM control signal with the preset frequency, and the preset frequency is not less than a specified frequency; the constant current control unit is used for generating a constant current based on the power supply signal and outputting the constant current to the infrared emission tube so as to enable the infrared emission tube to generate an infrared signal with a preset frequency; the receiving unit is used for only receiving the infrared signal and generating a first alternating current signal based on the infrared signal; the amplifying unit is used for amplifying the first alternating current signal into a second alternating current signal; the rectification unit is used for converting the second alternating current signal into a direct current signal and outputting the direct current signal to the ADC sampling module; the first end of the switch unit is an input end of a PWM control signal, the second end of the switch unit is connected with a 5V power supply, the third end of the switch unit is connected with the first end of the constant current control unit, the second end of the constant current control unit is an output end of constant current, the first end of the receiving unit is connected with the 5V power supply, the second end of the receiving unit is connected with the first end of the amplifying unit, the second end of the amplifying unit is connected with the first end of the rectifying unit, and the second end of the rectifying unit is an output end of a direct current signal. The infrared transmitting tube generates an infrared signal with preset frequency based on the PWM control signal, and the infrared receiving tube only receives the infrared signal with the preset frequency, so that the interference of external light can be avoided, and further infrared correlation detection can be more accurately carried out.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an infrared correlation detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a switching unit and a constant current control unit in an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of the receiving unit, the amplifying unit and the rectifying unit in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides an infrared correlation detection circuit, as shown in fig. 1, the circuit includes:
the switching unit 10 is configured to generate a power supply signal with a preset frequency according to the PWM control signal with the preset frequency, where the preset frequency is not less than a specified frequency;
the constant current control unit 20 is used for generating a constant current based on the power supply signal and outputting the constant current to the infrared transmitting tube so that the infrared transmitting tube generates an infrared signal with a preset frequency;
a receiving unit 30 for receiving only the infrared signal and generating a first alternating current signal based on the infrared signal;
an amplifying unit 40 for amplifying the first alternating current signal into a second alternating current signal;
the rectifying unit 50 is configured to convert the second ac signal into a dc signal and output the dc signal to the ADC sampling module;
the first end of the switch unit 10 is an input end of a PWM control signal, the second end of the switch unit 10 is connected to a 5V power supply, the third end of the switch unit 10 is connected to the first end of the constant current control unit 20, the second end of the constant current control unit 20 is an output end of a constant current, the first end of the receiving unit 30 is connected to the 5V power supply, the second end of the receiving unit 30 is connected to the first end of the amplifying unit 40, the second end of the amplifying unit 40 is connected to the first end of the rectifying unit 50, and the second end of the rectifying unit 50 is an output end of a direct current signal.
In this embodiment, the infrared correlation detection circuit includes an infrared emission portion for emitting infrared rays and an infrared reception portion for receiving infrared rays, the infrared emission portion includes a switch unit 10 and a constant current control unit 20, and the infrared reception portion includes a reception unit 30, an amplification unit 40, and a rectification unit 50.
The switching unit receives the PWM control signal of the preset frequency, generates a power supply signal of the preset frequency, and outputs the power supply signal to the constant current control unit 20. In order to avoid the interference of external light, the preset frequency is not less than the specified frequency, and in a specific application scenario of the present application, the specified frequency is 10kHz. The constant current control unit 20 generates a constant current based on the power supply signal, and supplies power to the infrared transmitting tube based on the constant current, so that the infrared transmitting tube generates an infrared signal with a preset frequency.
When the receiving unit 30 receives an infrared signal transmitted by the infrared transmitting tube, a first ac signal is generated based on the infrared signal, and the first ac signal is output to the amplifying unit 40, the amplifying unit 40 amplifies the first ac signal into a second ac signal, and outputs the second ac signal to the rectifying unit 50, the rectifying unit 50 converts the second ac signal into a dc signal, and outputs the dc signal to an ADC (Analog-to-Digital Converter) sampling module, so that the ADC sampling module samples the dc signal.
Since the infrared signal is at the predetermined frequency, the receiving unit 30 only receives the infrared signal at the predetermined frequency and generates the first ac signal, and does not receive the external light other than the predetermined frequency, so as to avoid the interference of the external light, and further perform the infrared correlation detection more accurately.
In order to ensure the reliability of the switching unit 10, in some embodiments of the present application, as shown in fig. 2, the switching unit 10 includes a first resistor R1, a second resistor R2, a third resistor R3, a transistor Q1, a MOS transistor Q2, and a first capacitor C1, wherein,
the one end of first resistance R1 is the first end of switch unit 10, triode Q1's base is connected to first resistance R1's the other end, second resistance R2's one end is connected to triode Q1's collecting electrode, second resistance R2's the other end and third resistance R3's one end co-connect in MOS pipe Q2's grid, MOS pipe Q2's the source electrode and third resistance R3's the other end co-connect in switch unit 10's second end, MOS pipe Q2's the third end of drain electrode connection switch unit 10, switch unit 10's second end is connected to first electric capacity C1's one end, first electric capacity C1's the other end and triode Q1's projecting pole all ground connection.
In order to ensure the reliability of the switching unit 10, in some embodiments of the present application, the MOS transistor Q2 is a P-channel MOS transistor.
In order to ensure the reliability of the constant current control unit 20, in some embodiments of the present application, as shown in fig. 2, the constant current control unit 20 includes a first chip U1 and a fourth resistor R4, a first pin of the first chip U1 is a first end of the constant current control unit 20, a second pin of the first chip U1 is connected to one end of the fourth resistor R4, and a third pin of the first chip U1 and the other end of the fourth resistor R4 are connected to a second end of the constant current control unit 20.
In order to ensure the reliability of the constant current control unit 20, in some embodiments of the present application, the model of the first chip U1 includes an LM317.
In order to ensure the reliability of the receiving unit 30, in some embodiments of the present disclosure, as shown in fig. 3, the receiving unit 30 includes a fifth resistor R5, an infrared receiving tube D1, and a second capacitor C2, wherein one end of the fifth resistor R5 is a first end of the receiving unit 30, the other end of the fifth resistor R5 is connected to a cathode of the infrared receiving tube D1, an anode of the infrared receiving tube D1 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is a second end of the receiving unit 30.
In this embodiment, the second capacitor C2 is a dc blocking capacitor, so that the receiving unit 30 can only receive the infrared signal with the predetermined frequency and generate the first ac signal. Optionally, the infrared receiving tube D1 is a silicon photocell.
In order to ensure the reliability of the amplifying unit 40, in some embodiments of the present application, as shown in fig. 3, the amplifying unit 40 includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a third capacitor C3, a fourth capacitor C4, a first operational amplifier A1, and a second operational amplifier A2, wherein,
one end of a sixth resistor R6 is a first end of the amplifying unit 40, the other end of the sixth resistor R6 and one end of a seventh resistor R7 are commonly connected to the inverting input terminal of the first operational amplifier A1, one end of an eighth resistor R8 is grounded, the other end of the eighth resistor R8 and one end of a ninth resistor R9 are commonly connected to the non-inverting input terminal of the first operational amplifier A1, the positive power source terminal of the first operational amplifier A1 and the other end of the ninth resistor R9 are commonly connected to the 5V power supply, one end of a third capacitor C3 is connected to the positive power source terminal of the first operational amplifier A1, the other end of the third capacitor C3 is grounded, the negative power source terminal of the first operational amplifier A1 is grounded, the other end of the seventh resistor R7 and one end of a tenth resistor R10 are commonly connected to the output terminal of the first operational amplifier A1, a fourth capacitor C4 is connected in parallel to the two ends of the seventh resistor R7, the other end of the tenth resistor R10 and one end of the eleventh resistor R11 are commonly connected to the inverting input terminal of the second operational amplifier A2, the non-inverting input terminal of the second operational amplifier A2 is connected to the twelfth input terminal of the twelfth operational amplifier a 12, and the non-inverting input terminal of the twelfth resistor R12.
In order to ensure the reliability of the rectifying unit 50, in some embodiments of the present application, as shown in fig. 3, the rectifying unit 50 includes a second chip U2, a fifth capacitor C5, and a sixth capacitor C6, wherein a first pin, a sixth pin, and an eighth pin of the second chip U2 are all grounded, a second pin of the second chip U2 is a first end of the rectifying unit 50, a third pin of the second chip U2 is grounded through the fifth capacitor C5, a fourth pin of the second chip U2 is floating, one end of the fifth pin of the second chip U2 and one end of the sixth capacitor C6 are commonly connected to a second end of the rectifying unit 50, the other end of the sixth capacitor C6 is connected to the sixth pin of the second chip U2, and a seventh pin of the second chip U2 is connected to a 5V power supply.
In order to ensure the reliability of the rectifying unit 50, in some embodiments of the present application, the model of the second chip U2 includes LTC1967IMS8# PBF.
Through using above technical scheme, infrared correlation detection circuitry includes: the switching unit is used for generating a power supply signal with a preset frequency according to the PWM control signal with the preset frequency, and the preset frequency is not less than a specified frequency; the constant current control unit is used for generating a constant current based on the power supply signal and outputting the constant current to the infrared emission tube so that the infrared emission tube generates an infrared signal with a preset frequency; the receiving unit is used for receiving only the infrared signal and generating a first alternating current signal based on the infrared signal; an amplifying unit for amplifying the first alternating current signal into a second alternating current signal; the rectification unit is used for converting the second alternating current signal into a direct current signal and outputting the direct current signal to the ADC sampling module; the first end of the switch unit is an input end of a PWM control signal, the second end of the switch unit is connected with a 5V power supply, the third end of the switch unit is connected with the first end of the constant current control unit, the second end of the constant current control unit is an output end of constant current, the first end of the receiving unit is connected with the 5V power supply, the second end of the receiving unit is connected with the first end of the amplifying unit, the second end of the amplifying unit is connected with the first end of the rectifying unit, and the second end of the rectifying unit is an output end of a direct current signal. The infrared transmitting tube generates an infrared signal with preset frequency based on the PWM control signal, and the infrared receiving tube only receives the infrared signal with the preset frequency, so that the interference of external light can be avoided, and further infrared correlation detection can be more accurately carried out.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. An infrared correlation detection circuit, the circuit comprising:
the switching unit is used for generating a power supply signal with a preset frequency according to a PWM control signal with the preset frequency, and the preset frequency is not less than a specified frequency;
the constant current control unit is used for generating a constant current based on the power supply signal and outputting the constant current to the infrared emission tube so that the infrared emission tube generates an infrared signal with the preset frequency;
the receiving unit is used for receiving the infrared signal only and generating a first alternating current signal based on the infrared signal;
the amplifying unit is used for amplifying the first alternating current signal into a second alternating current signal;
the rectifying unit is used for converting the second alternating current signal into a direct current signal and outputting the direct current signal to the ADC sampling module;
the first end of the switch unit is an input end of the PWM control signal, the second end of the switch unit is connected with a 5V power supply, the third end of the switch unit is connected with the first end of the constant current control unit, the second end of the constant current control unit is an output end of constant current, the first end of the receiving unit is connected with the 5V power supply, the second end of the receiving unit is connected with the first end of the amplifying unit, the second end of the amplifying unit is connected with the first end of the rectifying unit, and the second end of the rectifying unit is an output end of the direct current signal.
2. The circuit of claim 1, wherein the switching unit comprises a first resistor, a second resistor, a third resistor, a transistor, a MOS transistor, and a first capacitor, wherein,
the one end of first resistance does the first end of switch unit, the other end of first resistance is connected the base of triode, the collecting electrode of triode is connected the one end of second resistance, the other end of second resistance with the one end of third resistance connect in altogether the grid of MOS pipe, the source electrode of MOS pipe with the other end of third resistance connect in altogether the second end of switch unit, the drain electrode of MOS pipe is connected the third end of switch unit, the one end of first electric capacity is connected the second end of switch unit, the other end of first electric capacity with the projecting pole of triode all grounds.
3. The circuit of claim 2, wherein the MOS transistor is a P-channel MOS transistor.
4. The circuit of claim 1, wherein the constant current control unit comprises a first chip and a fourth resistor, a first pin of the first chip is a first end of the constant current control unit, a second pin of the first chip is connected with one end of the fourth resistor, and a third pin of the first chip and the other end of the fourth resistor are connected with a second end of the constant current control unit.
5. The circuit of claim 4, wherein the model of the first chip comprises LM317.
6. The circuit of claim 1, wherein the receiving unit comprises a fifth resistor, an infrared receiving tube and a second capacitor, one end of the fifth resistor is a first end of the receiving unit, the other end of the fifth resistor is connected to a cathode of the infrared receiving tube, an anode of the infrared receiving tube is connected to one end of the second capacitor, and the other end of the second capacitor is a second end of the receiving unit.
7. The circuit of claim 1, wherein the amplification unit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a third capacitor, a fourth capacitor, a first operational amplifier, and a second operational amplifier, wherein,
one end of the sixth resistor is a first end of the amplifying unit, the other end of the sixth resistor and one end of the seventh resistor are commonly connected to an inverting input end of the first operational amplifier, one end of the eighth resistor is grounded, the other end of the eighth resistor and one end of the ninth resistor are commonly connected to a non-inverting input end of the first operational amplifier, a positive power source end of the first operational amplifier and the other end of the ninth resistor are commonly connected to a 5V power source, one end of the third capacitor is connected to a positive power source end of the first operational amplifier, the other end of the third capacitor is grounded, a negative power source of the first operational amplifier is grounded, the other end of the seventh resistor and one end of the tenth resistor are commonly connected to an output end of the first operational amplifier, the fourth capacitor is connected in parallel to two ends of the seventh resistor, the other end of the tenth resistor and one end of the eleventh resistor are commonly connected to an inverting input end of the second operational amplifier, the non-inverting input end of the second operational amplifier is connected to a non-inverting input end of the first operational amplifier, the other end of the eleventh resistor and one end of the twelfth resistor are commonly connected to an inverting input end of the twelfth operational amplifier.
8. The circuit of claim 1, wherein the rectifying unit comprises a second chip, a fifth capacitor and a sixth capacitor, wherein the first pin, the sixth pin and the eighth pin of the second chip are all grounded, the second pin of the second chip is a first end of the rectifying unit, the third pin of the second chip is grounded through the fifth capacitor, the fourth pin of the second chip is floating, one end of the fifth pin of the second chip and one end of the sixth capacitor are connected to the second end of the rectifying unit in common, the other end of the sixth capacitor is connected to the sixth pin of the second chip, and the seventh pin of the second chip is connected to a 5V power supply.
9. The circuit of claim 8, wherein the model number of the second chip comprises LTC1967IMS8# PBF.
10. An infrared sensor comprising the infrared correlation detection circuit as set forth in any one of claims 1 to 9.
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