CN211402784U - Infrared induction circuit applied to bathroom products - Google Patents
Infrared induction circuit applied to bathroom products Download PDFInfo
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- CN211402784U CN211402784U CN202020339859.6U CN202020339859U CN211402784U CN 211402784 U CN211402784 U CN 211402784U CN 202020339859 U CN202020339859 U CN 202020339859U CN 211402784 U CN211402784 U CN 211402784U
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Abstract
The utility model discloses a be applied to infrared induction circuit of bathroom product, including photocurrent sampling circuit, signal amplification circuit, error upper limit comparison circuit and error lower limit comparison circuit, photocurrent sampling circuit is connected with signal amplification circuit electricity, and error upper limit comparison circuit and error lower limit comparison circuit all are connected with signal amplification circuit's output electricity. The photoelectric current sampling circuit is arranged, so that detected optical signals can be converted into electric signals; the signal amplification circuit is arranged, an input target signal can be amplified, the target signal intensity is convenient to compare with the error upper limit and lower limit comparison voltages of the error upper limit comparison circuit and the error lower limit comparison circuit, whether corresponding bathroom products are used by people or not is convenient to accurately judge, misjudgment of the corresponding bathroom products on the detected target is reduced, and the adaptability of the bathroom products to complex environments is improved.
Description
Technical Field
The utility model belongs to an infrared induction application circuit especially relates to an infrared induction circuit who is applied to bathroom product.
Background
The infrared sensing circuit of the existing bathroom products mostly sets the corresponding sensing signal intensity, namely the threshold intensity, according to the material of the target to be measured and the required target distance. When the bathroom product works, when the strength of the induction signal is detected to be greater than the threshold strength, people are determined to use the bathroom product, namely, the bathroom product is flushed according to the set flushing process or flushing water amount; and when the strength of the induction signal is detected to be less than the threshold strength, the water flushing device is determined to be unmanned and not flushed.
However, the practical application environment of sanitary products is different, such as: the infrared induction urinal flusher and the infrared induction stool flusher are installed on the wall surface of a toilet, the opposite wall surface (or door) can be a lime wall surface, a ceramic wall surface or a stainless steel wall surface, etc., the hand basin installed on the infrared induction faucet also has different materials such as ceramic, stainless steel, electroplating, etc., and the wall surface or the hand basin is called as 'background'. The induced signal intensity ratio of the backgrounds of different materials and parts of backgrounds is higher than that of the detected target, such as: the strength of the induction signal of a human body or a hand is stronger, and particularly when the background distance is shorter or the background reflectivity is higher, the difficulty is caused for distinguishing the background and the detected target.
If the detection distance of the detected target is reduced in order to adapt to the background with a short distance or a high reflectivity, that is, the threshold intensity is increased, the detection distance is too short, and the good user experience of the bathroom product is influenced.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a be applied to infrared induction circuit of bathroom product can solve above-mentioned problem.
According to the utility model discloses an aspect provides an infrared induction circuit for bathroom product, including photocurrent sampling circuit, signal amplification circuit, error upper limit comparison circuit and error lower limit comparison circuit, photocurrent sampling circuit is connected with signal amplification circuit electricity, and error upper limit comparison circuit and error lower limit comparison circuit all are connected with signal amplification circuit's output electricity.
The utility model has the advantages that: the photoelectric current sampling circuit is arranged, so that detected optical signals can be converted into electric signals; the signal amplification circuit is arranged, an input target signal can be amplified, the target signal intensity is convenient to compare with the error upper limit and lower limit comparison voltages of the error upper limit comparison circuit and the error lower limit comparison circuit, whether corresponding bathroom products are used by people or not is convenient to accurately judge, misjudgment of the corresponding bathroom products on the detected target is reduced, and the adaptability of the bathroom products to complex environments is improved.
In some embodiments, the photocurrent sampling circuit includes a first capacitor, a photodiode, a second capacitor, a second resistor, and a third resistor, one end of the first capacitor is electrically connected to one end of the first resistor, and the other end is grounded, one end of the third resistor is electrically connected to the signal amplification circuit, one end of the second resistor is electrically connected to the positive electrode of the photodiode, the negative electrode of the photodiode is electrically connected to one end of the first resistor, the other ends of the second resistor and the third resistor are both grounded, one end of the second capacitor is electrically connected to one end of the third resistor, and the other end is electrically connected to one end of the second resistor. Therefore, the optical signal can be conveniently converted, and the optical signal can be accurately converted into the electric signal.
In some embodiments, the signal amplifying circuit includes a first amplifier, a second amplifier, a first resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a fourth capacitor, the input terminal of the first resistor is electrically connected to an external power source, the output terminal is electrically connected to the cathode of the photodiode and the power supply anode of the second amplifier, the non-inverting input terminal of the first amplifier is electrically connected to one terminal of the third resistor, one terminal of the fifth resistor is connected to the inverting input terminal of the first amplifier, the other terminal is connected to the output terminal of the first amplifier, one terminal of the fourth resistor is connected to one terminal of the fifth resistor, the other terminal is grounded, one terminal of the fourth capacitor is connected to the output terminal of the first amplifier, the other terminal of the fourth resistor is connected to one terminal of the sixth resistor, the other terminal of the sixth resistor is grounded, the power supply anode of the second amplifier is connected to the output terminal of the, the non-inverting input end of the second amplifier is connected with the other end of the fourth capacitor, one end of the seventh resistor is connected with the inverting input end of the second amplifier, the power supply negative electrode of the second amplifier (AMP2) is grounded, one end of the eighth resistor is connected with one end of the seventh resistor, the other end of the eighth resistor is connected with the output end of the second amplifier, and the error upper limit comparison circuit and the error lower limit comparison circuit are both connected with the output end of the second amplifier. Therefore, the signals of the photoelectric current sampling circuit can be amplified conveniently by the two amplifiers, the background signal intensity of the environment where the bathroom product is located can be obtained conveniently, and the accuracy of signal acquisition is improved.
In some embodiments, the signal amplification circuit further includes a third capacitor and a fifth capacitor, the third capacitor is connected in parallel with the fifth resistor, and the fifth capacitor is connected in parallel with the eighth resistor. This improves the stability of the signal amplification circuit.
In some embodiments, the error upper limit comparing circuit includes a first comparator, a ninth resistor, and a sixth capacitor, a non-inverting input terminal of the first comparator is connected to the output terminal of the second amplifier, one end of the ninth resistor is connected to the external chip, one end of the sixth capacitor and an inverting input terminal of the first comparator are both electrically connected to the other end of the ninth resistor, and the other end of the sixth capacitor is grounded. Therefore, the ninth resistor and the sixth capacitor form error upper limit comparison voltage at the inverting input end of the first comparator according to the external chip signal.
In some embodiments, the error lower limit comparison circuit includes a second comparator, a tenth resistor, and a seventh capacitor, a non-inverting input terminal of the second comparator is connected to the output terminal of the second amplifier, a positive power supply terminal of the second comparator is connected to the external power supply, one end of the tenth resistor is connected to the external chip, one end of the seventh capacitor and an inverting input terminal of the second comparator are both electrically connected to the other end of the tenth resistor, a negative power supply terminal of the second comparator is grounded, and the other end of the seventh capacitor is grounded. Therefore, the tenth resistor and the seventh capacitor form error lower limit comparison voltage at the inverting input end of the second comparator according to the external chip signal.
In some embodiments, the photocurrent sampling circuit further includes an eighth capacitor connected in parallel with the second resistor. Therefore, the interference caused by the outside or a power supply can be reduced, and the anti-interference performance of the bathroom product is improved.
In some embodiments, the error upper limit comparison circuit includes a first comparator, a non-inverting input terminal of the first comparator is connected to an output terminal of the second amplifier, an inverting input terminal of the first comparator is connected to the external chip, the error lower limit comparison circuit includes a second comparator, a non-inverting input terminal of the second comparator is connected to an output terminal of the second amplifier, an inverting input terminal of the second comparator is connected to the external chip, and a positive power supply terminal of the second comparator is connected to the external power supply. Therefore, the error upper and lower limit comparison voltages of the inverting input ends of the two comparators can be directly provided with corresponding reference voltages by an external chip, so that the circuit is simplified.
In some embodiments, the error upper limit comparison circuit further includes an eleventh resistor, and the error lower limit comparison circuit further includes a twelfth resistor, the eleventh resistor being connected in parallel with the sixth capacitor, and the twelfth resistor being connected in parallel with the seventh capacitor. Therefore, the voltage smoothness of the inverting input ends of the two comparators can be improved.
In some embodiments, the error upper limit comparison circuit includes a ninth resistor and a sixth capacitor, one end of the ninth resistor is connected to the external chip, one end of the sixth capacitor is electrically connected to the other end of the ninth resistor and to an inverting input terminal of a comparator inside the external chip, the other end of the sixth capacitor is grounded, the error lower limit comparison circuit includes a tenth resistor and a seventh capacitor, one end of the tenth resistor is connected to the external chip, one end of the seventh capacitor is electrically connected to the other end of the tenth resistor and to an inverting input terminal of another comparator inside the external chip, and the other end of the seventh capacitor is grounded. Thus, the integration degree of the circuit can be improved.
Drawings
FIG. 1 is a schematic circuit diagram of one embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of another embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of another embodiment of the present invention;
FIG. 4 is a circuit schematic of another embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of another embodiment of the present invention;
fig. 6 is a circuit schematic diagram of another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 6: the utility model provides an infrared induction circuit for bathroom product, includes photocurrent sampling circuit 1, signal amplification circuit 2, error upper limit comparison circuit 3 and error lower limit comparison circuit 4, and photocurrent sampling circuit 1 is connected with signal amplification circuit 2 electricity, and error upper limit comparison circuit 3 and error lower limit comparison circuit 4 all are connected with signal amplification circuit 2's output electricity.
The photocurrent sampling circuit 1 includes a first capacitor C1, a photodiode PD, a second capacitor C2, a second resistor R2 and a third resistor R3, one end of the first capacitor C1 is electrically connected to one end of the first resistor R1, the other end is grounded, one end of the third resistor R3 is electrically connected to the signal amplifying circuit 2, one end of the second resistor R2 is electrically connected to the anode of the photodiode PD, the cathode of the photodiode PD is electrically connected to one end of the first resistor R1, the other ends of the second resistor R2 and the third resistor R3 are both grounded, one end of the second capacitor C2 is electrically connected to one end of the third resistor R3, and the other end is electrically connected to one end of the second resistor R2.
As shown in fig. 2, in some embodiments, the signal amplifying circuit 2 includes a first amplifier AMP1, a second amplifier AMP2, a first resistor R1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a fourth capacitor C4, an input terminal of the first resistor R1 is electrically connected to the external power source, an output terminal of the first resistor R1 is electrically connected to the negative electrode of the photodiode PD and the positive power supply terminal of the second AMP2, a non-inverting input terminal of the first amplifier AMP1 is electrically connected to one terminal of the third resistor R3, one terminal of the fifth resistor R5 is connected to the inverting input terminal of the first AMP1, the other terminal of the fifth resistor R1 is connected to the output terminal of the first amplifier AMP1, one terminal of the fourth resistor R4 is connected to one terminal of the fifth resistor R5, the other terminal of the fourth capacitor C4 is connected to the output terminal of the first amplifier AMP1, the other terminal of the sixth resistor R6 is connected to one terminal of the sixth resistor R6, the positive electrode of the power supply of the second amplifier AMP2 is connected with the output end of the first resistor R1, the non-inverting input end of the second amplifier AMP2 is connected with the other end of the fourth capacitor C4, one end of the seventh resistor R7 is connected with the inverting input end of the second amplifier AMP2, the negative electrode of the power supply of the second amplifier AMP2 is grounded, one end of the eighth resistor R8 is connected with one end of the seventh resistor R7, the other end of the eighth resistor R8 is connected with the output end of the second amplifier AMP2, and the error upper limit comparison circuit 3 and the error lower limit comparison circuit 4 are both connected with the output end of the second amplifier AMP 2. The first amplifier AMP1 and the second amplifier AMP2 are coupled and connected via a fourth capacitor C4.
The photocurrent sampling circuit 1 outputs a sensing signal to the non-inverting input terminal of the first amplifier AMP1 through the second capacitor C2, and the sensing signal is amplified by a plurality of times through the first amplifier AMP1 and the second amplifier AMP2 and then respectively output to the error upper limit comparing circuit 3 and the error lower limit comparing circuit 4.
As shown in fig. 1, in other embodiments, the signal amplifying circuit 2 further includes a third capacitor C3 and a fifth capacitor C5, the third capacitor C3 is connected in parallel with the fifth resistor R5, and the fifth capacitor C5 is connected in parallel with the eighth resistor R8.
The error upper limit comparison circuit 3 comprises a first comparator COM1, a ninth resistor R9 and a sixth capacitor C6, wherein the non-inverting input end of the first comparator COM1 is connected with the output end of the second amplifier AMP2, one end of the ninth resistor R9 is connected with an external chip, one end of the sixth capacitor C6 and the inverting input end of the first comparator COM1 are both electrically connected with the other end of the ninth resistor R9, and the other end of the sixth capacitor C6 is grounded.
The error lower limit comparison circuit 4 comprises a second comparator COM2, a tenth resistor R10 and a seventh capacitor C7, wherein the non-inverting input end of the second comparator COM2 is connected with the output end of the second amplifier AMP2, one end of the tenth resistor R10 is connected with an external chip, one end of the seventh capacitor C7 and the inverting input end of the second comparator COM2 are both electrically connected with the other end of the tenth resistor R10, the power supply negative electrode of the second comparator COM2 is grounded, the other end of the seventh capacitor C7 is grounded, and the power supply positive electrode of the second comparator COM2 is connected with an external power supply.
The utility model discloses an infrared induction circuit for bathroom product need detect the background signal intensity of bathroom product place environment earlier just at the circular telegram during operation, lasts a plurality of minutes, forbids the user to use during this period. The detection process of the background signal intensity is as follows: firstly, an external MCU (Microcontroller Unit) chip provides working voltage for amplifiers AMP1 and AMP2 through an AMP-POWER port, and then a photocurrent sampling circuit 1 can receive a sensing signal which is controlled by the external MCU chip and reflected by a background; the sensing SIGNAL is input to the non-inverting input end of the first amplifier AMP1 through the second capacitor C2, and is amplified by the first amplifier AMP1 and the second amplifier AMP2 in two stages, the sensing SIGNAL is input to the external MCU chip through an external AMP-SIGNAL port connected with the output end of the second amplifier AMP2, and the external MCU chip analyzes and records the SIGNAL as the background SIGNAL intensity. In the process of detecting the background signal intensity, if the background signal intensity changes in the detection period, the background detection is determined to be inaccurate, and the detection needs to be carried out again; if the background signal intensity is unchanged in the whole detection period, the background detection is determined to be accurate, and the detection of the background signal intensity is finished.
The utility model discloses a be applied to infrared induction circuit of bathroom product after having detected background signal intensity, the bathroom product can use.
The external MCU chip provides an error upper limit PWM (Pulse Width Modulation) signal with a certain duty ratio to the ninth resistor R9 and an error lower limit PWM signal with a certain duty ratio to the tenth resistor R10 according to the detection precision of the whole circuit, and an error upper limit comparison voltage at the inverting input end of the first comparator COM1 and an error lower limit comparison voltage at the inverting input end of the second comparator COM2 are respectively formed, the error upper limit comparison voltage is higher than the intensity of the background signal by a certain proportion, the error lower limit comparison voltage is lower than the intensity of the background signal by a certain proportion, and the specific proportion is increased or reduced according to the use requirement.
After the upper and lower error limit comparison voltage is determined to be stable, then a photocurrent sampling circuit 1 can receive a sensing SIGNAL which is controlled by an external MCU chip and reflected by a measured object, the sensing SIGNAL is input to the non-inverting input end of a first amplifier AMP1 through a second capacitor C2, the sensing SIGNAL is amplified in two stages through a first amplifier AMP1 and a second amplifier AMP2 of the amplifier, and the sensing SIGNAL is input to the non-inverting input ends of a first comparator COM1 and a second comparator COM2 through AMP-SIGNAL ports and is compared with the upper and lower error limit comparison voltage of the inverting input ends respectively. If the target signal intensity is equal to the threshold intensity (namely, less than the error upper limit comparison voltage and greater than the error lower limit comparison voltage), the target signal is determined to be unused; if the target signal intensity is not equal to the threshold intensity (namely, greater than the error upper limit comparison voltage or less than the error lower limit comparison voltage), the user is determined to use the target signal, and the external MCU chip flushes according to the set flushing process or flushing amount.
Therefore, as long as the target signal intensity of the bathroom product is not equal to the threshold intensity, people can be determined to use the bathroom product, the adaptability of the bathroom product to different background materials or narrow and small space environments is improved, and therefore the problem that the existing general bathroom product can be normally judged to be used by people only when the target signal intensity is smaller than the threshold intensity is solved. If the background reflectivity is high or the environmental space is narrow, the applicable target detection distance is very short.
As the person using the bathroom product is a moving target to be detected, and the background (wall surface or basin) is fixed, if the target signal intensity is detected to be not equal to the threshold intensity and is changed within a certain time, the person can be determined to use the bathroom product, and other non-human-factor targets do not have the characteristic. Therefore, the dynamic detection of the bathroom product is realized, and the misjudgment of the detected target is reduced.
As shown in fig. 3, in other embodiments, the photocurrent sampling circuit 1 further includes an eighth capacitor C8, and the eighth capacitor C8 is connected in parallel with the second resistor R2. Through being equipped with eighth electric capacity C8, can reduce the interference that outside or power brought, improve the interference immunity of bathroom product.
In other embodiments, as shown in fig. 4, the error upper limit comparison circuit 3 includes a first comparator COM1, a non-inverting input terminal of the first comparator COM1 is connected to an output terminal of the second amplifier AMP2, an inverting input terminal of the first comparator COM1 is connected to the external chip, the error lower limit comparison circuit 4 includes a second comparator COM2, a non-inverting input terminal of the second comparator COM2 is connected to an output terminal of the second amplifier AMP2, an inverting input terminal of the second comparator COM2 is connected to the external chip, and a power supply positive terminal of the second comparator COM2 is connected to the external power supply. In the embodiment, the error upper and lower limit comparison voltages at the inverting input ends of the first comparator COM1 and the second comparator COM2 can be directly provided with corresponding reference voltages by an external MCU chip, so that the whole circuit is simplified.
As shown in fig. 6, in other embodiments, the error upper limit comparing circuit 3 further includes an eleventh resistor R11, the error lower limit comparing circuit 4 further includes a twelfth resistor R12, the eleventh resistor R11 is connected in parallel with the sixth capacitor C6, and the twelfth resistor R12 is connected in parallel with the seventh capacitor C7. Therefore, by adding the eleventh resistor R11 and the twelfth resistor R12, the voltage smoothness of the inverting input terminal of the corresponding comparator can be improved.
As shown in fig. 5, in other embodiments, the error upper limit comparing circuit 3 includes a ninth resistor R9 and a sixth capacitor C6, one end of the ninth resistor R9 is connected to the external chip, one end of the sixth capacitor C6 is electrically connected to the other end of the ninth resistor R9, the other end of the sixth capacitor C6 is grounded, the error lower limit comparing circuit 4 includes a tenth resistor R10 and a seventh capacitor C7, one end of the tenth resistor R10 is connected to the external chip, one end of the seventh capacitor C7 is electrically connected to the other end of the tenth resistor R10, and the other end of the seventh capacitor C7 is grounded. Compared with other embodiments, the corresponding comparator is replaced by a built-in comparator of an external MCU chip, the external MCU chip can be a PIC16F series MCU chip or an MDT10F series MCU chip and the like, and the built-in comparator is included, so that the integration level of the whole circuit is improved.
The above is only the preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the inventive concept, and these all fall into the protection scope of the present invention.
Claims (10)
1. The utility model provides an infrared induction circuit for bathroom product, its characterized in that, includes photocurrent sampling circuit (1), signal amplification circuit (2), error upper limit comparison circuit (3) and error lower limit comparison circuit (4), photocurrent sampling circuit (1) is connected with signal amplification circuit (2) electricity, error upper limit comparison circuit (3) and error lower limit comparison circuit (4) all are connected with the output electricity of signal amplification circuit (2).
2. The infrared sensing circuit applied to sanitary products as claimed in claim 1, wherein, the photocurrent sampling circuit (1) comprises a first capacitor (C1), a Photodiode (PD), a second capacitor (C2), a second resistor (R2) and a third resistor (R3), one end of the first capacitor (C1) is electrically connected with one end of the first resistor (R1), the other end is grounded, one end of the third resistor (R3) is electrically connected with the signal amplifying circuit (2), one end of the second resistor (R2) is electrically connected with the anode of the Photodiode (PD), the cathode of the Photodiode (PD) is electrically connected with one end of a first resistor (R1), the other ends of the second resistor (R2) and the third resistor (R3) are both grounded, one end of the second capacitor (C2) is electrically connected with one end of the third resistor (R3), and the other end of the second capacitor (C2) is electrically connected with one end of the second resistor (R2).
3. The infrared sensing circuit applied to sanitary ware products of claim 2, wherein the signal amplifying circuit (2) comprises a first amplifier (AMP1), a second amplifier (AMP2), a first resistor (R1), a fourth resistor (R4), a fifth resistor (R5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8) and a fourth capacitor (C4), wherein an input end of the first resistor (R1) is electrically connected to an external power source, an output end of the first resistor (R6) is electrically connected to a cathode of the Photodiode (PD) and a power supply anode of the second amplifier (AMP2), a non-inverting input end of the first amplifier (AMP1) is electrically connected to one end of the third resistor (R3), one end of the fifth resistor (R5) is connected to an inverting input end of the first amplifier (AMP1), and the other end of the fifth resistor (AMP1) is connected to an output end of the first amplifier (AMP1), one end of the fourth resistor (R4) is connected to one end of a fifth resistor (R5), the other end of the fourth resistor is grounded, one end of the fourth capacitor (C4) is connected to the output end of the first amplifier (AMP1), the other end of the fourth capacitor (C4) is connected to one end of a sixth resistor (R6), the other end of the sixth resistor (R6) is grounded, the positive supply terminal of the second amplifier (AMP2) is connected to the output end of the first resistor (R1), the non-inverting input terminal of the second amplifier (AMP2) is connected to the other end of the fourth capacitor (C4), one end of the seventh resistor (R7) is connected to the inverting input terminal of the second amplifier (AMP2), the negative supply terminal of the second amplifier (AMP2) is grounded, one end of the eighth resistor (R8) is connected to one end of the seventh resistor (R7), the other end of the eighth resistor (AMP2) is connected to the output end of the second amplifier (AMP2), and the error upper limit comparison circuit (3) and the error lower limit comparison circuit (364) are connected to the output end of the second amplifier (2.
4. The infrared sensing circuit applied to sanitary products of claim 3, wherein the signal amplification circuit (2) further comprises a third capacitor (C3) and a fifth capacitor (C5), the third capacitor (C3) is connected in parallel with a fifth resistor (R5), and the fifth capacitor (C5) is connected in parallel with an eighth resistor (R8).
5. The infrared sensing circuit applied to sanitary products according to claim 4, wherein the error upper limit comparison circuit (3) comprises a first comparator (COM1), a ninth resistor (R9) and a sixth capacitor (C6), a non-inverting input terminal of the first comparator (COM1) is connected to an output terminal of the second amplifier (AMP2), one end of the ninth resistor (R9) is connected to the external chip, one end of the sixth capacitor (C6) and an inverting input terminal of the first comparator (COM1) are both electrically connected to the other end of the ninth resistor (R9), and the other end of the sixth capacitor (C6) is grounded.
6. The infrared sensing circuit applied to sanitary products according to claim 5, wherein the lower error limit comparison circuit (4) comprises a second comparator (COM2), a tenth resistor (R10) and a seventh capacitor (C7), a non-inverting input terminal of the second comparator (COM2) is connected with an output terminal of the second amplifier (AMP2), a positive power supply terminal of the second comparator (COM2) is connected with an external power supply, one end of the tenth resistor (R10) is connected with an external chip, one end of the seventh capacitor (C7) and an inverting input terminal of the second comparator (COM2) are both electrically connected with the other end of the tenth resistor (R10), a negative power supply terminal of the second comparator (COM2) is grounded, and the other end of the seventh capacitor (C7) is grounded.
7. The infrared sensing circuit applied to sanitary products according to any one of claims 4 to 6, wherein the photocurrent sampling circuit (1) further comprises an eighth capacitor (C8), and the eighth capacitor (C8) is connected in parallel with the second resistor (R2).
8. The infrared sensing circuit applied to sanitary products according to claim 4, wherein the error upper limit comparison circuit (3) comprises a first comparator (COM1), a non-inverting input terminal of the first comparator (COM1) is connected with an output terminal of a second amplifier (AMP2), an inverting input terminal of the first comparator (COM1) is connected with an external chip, the error lower limit comparison circuit (4) comprises a second comparator (COM2), a non-inverting input terminal of the second comparator (COM2) is connected with an output terminal of a second amplifier (AMP2), an inverting input terminal of the second comparator (COM2) is connected with the external chip, and a power supply positive terminal of the second comparator (COM2) is connected with the external power supply.
9. The infrared sensing circuit applied to sanitary products of claim 6, wherein the error upper limit comparison circuit (3) further comprises an eleventh resistor (R11), the error lower limit comparison circuit (4) further comprises a twelfth resistor (R12), the eleventh resistor (R11) is connected in parallel with a sixth capacitor (C6), and the twelfth resistor (R12) is connected in parallel with a seventh capacitor (C7).
10. The infrared sensing circuit applied to sanitary products of claim 4, wherein the error upper limit comparison circuit (3) comprises a ninth resistor (R9) and a sixth capacitor (C6), one end of the ninth resistor (R9) is connected to an external chip, one end of the sixth capacitor (C6) is electrically connected to the other end of the ninth resistor (R9), the other end of the sixth capacitor (C6) is grounded, the error lower limit comparison circuit (4) comprises a tenth resistor (R10) and a seventh capacitor (C7), one end of the tenth resistor (R10) is connected to the external chip, one end of the seventh capacitor (C7) is electrically connected to the other end of the tenth resistor (R10), and the other end of the seventh capacitor (C7) is grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020339859.6U CN211402784U (en) | 2020-03-17 | 2020-03-17 | Infrared induction circuit applied to bathroom products |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020339859.6U CN211402784U (en) | 2020-03-17 | 2020-03-17 | Infrared induction circuit applied to bathroom products |
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| CN211402784U true CN211402784U (en) | 2020-09-01 |
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