CN113794190A - Cloth identification circuit and device using three-eye infrared sensor - Google Patents
Cloth identification circuit and device using three-eye infrared sensor Download PDFInfo
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- CN113794190A CN113794190A CN202111097007.6A CN202111097007A CN113794190A CN 113794190 A CN113794190 A CN 113794190A CN 202111097007 A CN202111097007 A CN 202111097007A CN 113794190 A CN113794190 A CN 113794190A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
Abstract
The invention discloses a cloth identification circuit using a three-eye infrared sensor, which comprises: first, the emission part: the first transmitting circuit has 3 infrared transmitting tubes, the transmitting states (respectively corresponding to Q5, Q7 and Q9 in a circuit diagram) are controlled by software, the infrared transmitting tubes transmit in turn in sequence, and only one infrared transmitting tube is allowed to transmit an infrared signal at the same time; because the installation position and the distance of the sensor are different, the power of 3 emissions is different. According to the cloth identification circuit and device using the three-optical-eye infrared sensor, the direct-current component of ambient light can be directly filtered, external interference resistance crosstalk of an MCU during ADC sampling can be effectively avoided, the anti-interference performance of signals is improved, the functional requirement on ADC trigger sampling of the MCU can be greatly reduced, the dependence on a high-grade MCU is reduced, and the problem that the waveform amplitudes received at different moments are different can be effectively solved.
Description
Technical Field
The invention relates to the field of infrared cloth identification, in particular to a cloth identification circuit and a cloth identification device using a three-eye infrared sensor.
Background
With the gradual improvement of social love and beauty, the requirements of women on fashion trend, style and personalized aesthetic are improved. The varieties of the garment raw materials are more and more, and various garment materials such as knitted fabrics, gauze fabrics, lace fabrics and transparent fabrics are widely used. Social economy develops, the income of common people increases year by year, the wages of the labor-tight clothing sewing industry are increased, the comprehensive cost of clothing enterprises increases year by year, and the clothing enterprises have to invest automatic assembly line equipment for clothing production so as to reduce the dependence of the enterprises on a large number of skilled technical workers, and as a result, the number of workers is reduced, and the comprehensive manufacturing cost is reduced. The requirements on automatic equipment of clothes are higher and higher, at present, automatic equipment in the sewing industry generally cannot correctly identify various fabrics for sewing, and when a clothing enterprise produces personalized fabric clothing, the automatic equipment is difficult to identify, and the clothing enterprise still needs to rely on a large number of skilled technical workers for production. Therefore, the industry needs methods or products that can effectively and accurately identify various fabrics; the existing automatic sewing equipment commonly used in the sewing market has long technical aspects in the aspect of personalized cloth identification, the embodied effects are different, particularly, problems on an integrated machine are more, the space allowance of the integrated equipment is small, many enterprises adopt modular design, complex circuits are independently formed into different modules and are arranged on each part of the machine, the production and manufacturing complexity of the machine is increased, the used wiring terminals have service life limitation under the requirement of low cost due to the fact that the modules are connected through cables, the vibration frequency of the whole machine is greatly changed due to the fact that the sewing equipment repeatedly works at high speed, and the problem that the wiring terminals are in poor contact is often caused.
Disclosure of Invention
The invention mainly aims to provide a cloth identification circuit and a cloth identification device using a three-eye infrared sensor, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a cloth identification circuit using a binocular infrared sensor, the cloth identification circuit using the binocular infrared sensor comprising:
first, the emission part: the first transmitting circuit has 3 infrared transmitting tubes, the transmitting states (respectively corresponding to Q5, Q7 and Q9 in a circuit diagram) are controlled by software, the infrared transmitting tubes transmit in turn in sequence, and only one infrared transmitting tube is allowed to transmit an infrared signal at the same time; because the installation positions and the distances of the sensors are different, the 3 transmitted powers are different, the MCU generates different DAC voltages according to the starting state of the transmitting tube, and controls the output current of the transmitting tube and the output power through the constant current source circuit; the emitting part uses an operational amplifier as a constant current source, a single-chip DAC outputs different voltage signals to an input end of the operational amplifier according to the requirements of a software program, the voltage signals serve as the levels of two ends of a current-limiting resistor of the constant current source, and the magnitude of infrared emission current is determined; the DAC signal output end forms a complete automatic constant current source circuit together with a sampling resistor R50, a current control triode Q6, a triode base current limiting resistor R49, an operational amplifier U7, an operational amplifier input resistor R19 and an operational amplifier input filter capacitor C2 through a voltage division circuit formed by resistors R48 and R14; II, a receiving part: the C pole of the infrared receiving tube is connected with 5V voltage (the infrared receiving tube 1/2/3), and the E pole is connected with a sampling resistor in series to a signal ground (resistors R56, R55 and R2); when infrared light irradiates, according to the intensity of the infrared light, the infrared receiving tube is conducted, current which is in direct proportion to the intensity of the infrared light flows through the infrared receiving tube, and resistors (R56, R55 and R2) which are connected with the infrared receiving tube in series generate voltage U which is equal to IR because the current flows through two ends; meanwhile, a filter capacitor (C17, C32 and C31) is connected in parallel to sampling resistors (R56, R55 and R2), signals are input to pins 1, 5 and 2 of an electronic analog switch chip U5, software in the MCU generates a group of switch timing signals (2 signals) according to the current sequence of infrared transmitting tubes and sends the switch timing signals to conducting timing control IO pins (pins 9 and 10 of the chip) of the electronic analog switch chip U5; the electronic analog switch chip U5 connects one group of input signal pins 1, 5 and 2 from the outside with the output pin 3 according to the on-off time sequence requirement sent by MCU, then through the current limiting resistor R12 and the blocking capacitor C16, forms a signal voltage at the two resistors of the sampling resistor R17, then through the blocking capacitor C21 and the input resistor R8, sends to the 3 pins of the operational amplifier U6, after the signal is amplified by the operational amplifier U6, the voltage division is carried out through R13 and R59, the 5V signal is converted into 3.3V signal, then through the filter capacitor C23 to the 3 pins of the electronic analog switch chip U8, the synchronous separation signal sent by MCU is input to the 10 pins of the electronic analog switch chip U8, the electronic analog switch chip U8 connects the signal input to the 3 rd pins to the 1 and 5 pins of U8 respectively according to the level state of the 10 pins, wherein the 1 pin signal of U8 passes through the filter circuit composed of R166 and the sampling holding capacitor C85, the infrared-free illumination signal A is sent to a pin 5 of an operational amplifier U13 through an input resistor R115, is output from a pin 7 of an operational amplifier U13 after impedance matching of an operational amplifier U13, is output through an RC filter circuit formed by a resistor R78 and a filter capacitor C25 after being separated, is sent to an ADC module of the MCU for sampling, is sent to a pin 3 of the operational amplifier U13 through an input resistor R116 after the same pin 5 signal of U8 passes through the RC filter circuit formed by a resistor R167 and a sample-hold capacitor C86, is output from a pin 1 of the operational amplifier U13 after impedance matching of the operational amplifier U13, and is sent to the ADC module of the MCU for sampling after passing through an RC filter circuit formed by a resistor R77 and a filter capacitor C26 after being separated.
Preferably, in the transmitting part, when current passes through the sampling resistor, the formed voltage at two ends of the sampling resistor is fed back to the 4 pin of the operational amplifier U7, and then the output voltage of the operational amplifier U7 is adjusted by comparing with the voltage of the signal source of the 3 pin of the operational amplifier U7.
Preferably, in the transmitting part, a resistor R28 and a MOS transistor MN1 are connected in parallel at the rear end of the voltage dividing circuit at the DAC signal output end, and are used for performing close-range fine operation control on the infrared signal, when the mechanical installation distance between the infrared transmitting and receiving tubes is relatively short, the DAC output signal can only use a small part of voltage to meet the requirement of the output power of the infrared transmission, but the adjustment range of the DAC is relatively small, and the adjustment precision is not fine enough, so that the MCU adds a current-limiting control output, the current-limiting control output passes through the resistor R20 to the control gate of the MOS transistor MN1, and then passes through the resistor R28 to be connected to the voltage dividing circuit output end of the DAC, and when the MN1 is turned on, the voltage dividing resistor is added to the voltage dividing circuit at the signal output end of the DAC, so as to directly further divide the output voltage of the DAC.
Preferably, in the receiving part, the blocking C16 capacitor filters out continuous direct current voltage signals generated by sunlight irradiating on the infrared receiving tube.
Preferably, in the receiving part, the feedback resistor R53, the ground resistor R57, the alternating current feedback capacitor C24 and the operational amplifier U6 form an in-phase amplifying circuit.
Preferably, in the receiving part, the electronic analog switch chip U8 performs gating separation on the voltage signals at the time when infrared light is irradiated and the time when no infrared light is irradiated.
A cloth recognition apparatus using a three-eye infrared sensor, the apparatus comprising:
a transmission circuit unit, which functions as a transmission circuit unit that makes transmission power programmable;
and the receiving circuit unit can filter sunlight and separate ambient light from the infrared cloth detection signal.
Preferably, the receiving circuit unit specifically includes: increased signal synchronization separation, become traditional unipolar judgement mode bipolar judgement mode, software is through contrasting two signals, calculates the infrared signal of median difference's mode and obtains the discernment cloth of higher accuracy, simultaneously, because the existence of synchronization separation, the infrared signal that will be used for cloth discernment and environment light signal have carried out the separation, when the sunlight signal is too strong, software can discern, when meetting the receiving sensor signal saturation that the sunlight infrared signal too strong leads to, be used for reminding the user to change operational environment.
Compared with the prior art, the invention has the following beneficial effects:
in the invention, the signal processing circuit adds signal synchronous separation, the traditional unipolar judgment mode is changed into a bipolar judgment mode, the software obtains an infrared signal for identifying the cloth with higher precision by comparing the two signals and calculating a middle difference value, and meanwhile, due to the existence of synchronous separation, the infrared signal for identifying the cloth and an ambient light signal are separated, and when the sunlight signal is too strong, the software can identify the infrared signal. When the receiving sensor signal is saturated due to too strong sunlight infrared signals, a user is reminded to change the working environment;
the signal processing circuit is added with a signal sampling and holding processing mode, after the signals subjected to synchronous separation are divided into two paths and separated, the two groups of sampling and holding capacitors are respectively charged, the MCU only needs to sample the two groups of signals by the ADC when each infrared transmission period is finished, and meanwhile, the electronic switch can point to the switch position without the signals;
when the ADC samples, no signal from the outside is input, so that the external interference resistance of the MCU during ADC sampling is effectively avoided, the interference resistance of the signal is improved, and only one ADC sampling is required when the infrared transmission period is finished, so that the functional requirement on triggering sampling of the ADC of the MCU is greatly reduced, and the dependence on a high-grade MCU is reduced;
due to the existence of the sampling holding capacitor, the received signals are filtered to obtain stable signals, and the problem that the received waveform amplitudes are different at different moments is effectively solved.
Drawings
FIG. 1 is a diagram of a transmission circuit of a cloth identification circuit using a three-eye infrared sensor according to the present invention;
FIG. 2 is a receiving circuit diagram of a cloth identification circuit using a three-eye infrared sensor according to the present invention;
fig. 3 is a block diagram illustrating a structure of a cloth recognition apparatus using a three-eye infrared sensor according to the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The first embodiment is as follows:
referring to fig. 1-2, a cloth identification circuit using a three-photo eye infrared sensor, the cloth identification circuit using a three-photo eye infrared sensor includes:
first, the emission part: the emitting circuit I has 3 infrared emitting tubes, the emitting state (respectively corresponding to Q5, Q7 and Q9 in a circuit diagram) is controlled by software, the emitting tubes are emitted in turn in sequence, and only one infrared emitting tube is allowed to emit an infrared signal at the same time, so that the mutual influence among multiple communication channels is avoided, the load of a power supply is reduced, and the electric control heating is reduced; because the installation positions and the distances of the sensors are different, the 3 transmitted powers are different, the MCU generates different DAC voltages according to the starting state of the transmitting tube, and the output current of the transmitting tube is controlled by the constant current source circuit, so that the control of the output power is realized; the emitting part uses an operational amplifier as a constant current source, a single-chip DAC outputs different voltage signals to an input end of the operational amplifier according to the requirements of a software program, the voltage signals serve as the levels of two ends of a current-limiting resistor of the constant current source, and the magnitude of infrared emission current is determined; the DAC signal output end forms a complete automatic constant current source circuit with a sampling resistor R50, a current control triode Q6, a triode base current limiting resistor R49, an operational amplifier U7, an operational amplifier input resistor R19 and an operational amplifier input filter capacitor C2 through a voltage division circuit formed by resistors R48 and R14, the rear end of the voltage division circuit of the DAC signal output end is connected with a resistor R28 and an MOS tube MN1 in parallel for short-distance fine operation control of infrared signals, when the mechanical installation distance between the infrared emission and receiving tubes is closer, the DAC output signals can only use a very small part of voltage to meet the requirement of the output power of the infrared emission, but the adjustment range of the DAC is smaller, and the adjustment precision is not fine enough, therefore, the MCU is additionally provided with a path of current limiting control output, the resistor R28 is connected to the voltage division circuit output end of the DAC through a control grid of the MOS tube MN1 through the resistor R20, when MN1 is conducted, a divider resistor is added on a voltage divider circuit at the signal output end of the DAC, the output voltage of the DAC is directly subjected to further voltage division, and the voltage divider circuit formed by MOS tubes is incorporated under the same voltage at the input end of the operational amplifier, so that the output voltage value of the DAC can be improved, and the output precision of the DAC is expanded;
II, a receiving part: the C pole of the infrared receiving tube is connected with 5V voltage (the infrared receiving tube 1/2/3), and the E pole is connected with a sampling resistor in series to a signal ground (resistors R56, R55 and R2); when infrared light irradiates, according to the intensity of the infrared light, the infrared receiving tube is conducted, current which is in direct proportion to the intensity of the infrared light flows through the infrared receiving tube, and resistors (R56, R55 and R2) which are connected with the infrared receiving tube in series generate voltage U which is equal to IR because the current flows through two ends; meanwhile, a filter capacitor (C17, C32 and C31) is connected in parallel to sampling resistors (R56, R55 and R2), signals are input to pins 1, 5 and 2 of an electronic analog switch chip U5, software in the MCU generates a group of switch timing signals (2 signals) according to the current sequence of infrared transmitting tubes and sends the switch timing signals to conducting timing control IO pins (pins 9 and 10 of the chip) of the electronic analog switch chip U5; the electronic analog switch chip U5 connects one group of input signal pins 1, 5 and 2 from the outside with the output pin 3 according to the on-off time sequence requirement sent by MCU, then through the current limiting resistor R12 and the blocking capacitor C16, forms a signal voltage at the two resistors of the sampling resistor R17, then through the blocking capacitor C21 and the input resistor R8, sends to the 3 pins of the operational amplifier U6, after the signal is amplified by the operational amplifier U6, the voltage division is carried out through R13 and R59, the 5V signal is converted into 3.3V signal, then through the filter capacitor C23 to the 3 pins of the electronic analog switch chip U8, the synchronous separation signal sent by MCU is input to the 10 pins of the electronic analog switch chip U8, the electronic analog switch chip U8 connects the signal input to the 3 rd pins to the 1 and 5 pins of U8 respectively according to the level state of the 10 pins, wherein the 1 pin signal of U8 passes through the filter circuit composed of R166 and the sampling holding capacitor C85, the infrared-free illumination signal A is sent to a pin 5 of an operational amplifier U13 through an input resistor R115, is output from a pin 7 of an operational amplifier U13 after impedance matching of an operational amplifier U13, is output through an RC filter circuit formed by a resistor R78 and a filter capacitor C25 after being separated, is sent to an ADC module of the MCU for sampling, is sent to a pin 3 of the operational amplifier U13 through an input resistor R116 after the same pin 5 signal of U8 passes through the RC filter circuit formed by a resistor R167 and a sample-hold capacitor C86, is output from a pin 1 of the operational amplifier U13 after impedance matching of the operational amplifier U13, and is sent to the ADC module of the MCU for sampling after passing through an RC filter circuit formed by a resistor R77 and a filter capacitor C26 after being separated. Due to the electronic analog switch chip U8, the signal input to the 3 rd pin is connected to the 1 st pin and the 5 th pin of U8, respectively, according to the level state of the 10 pins. At the same time, only one set of switches is on. Therefore, when the signal U8 is connected between pin 3 and pin 1, the internal switch corresponding to pin 5 is turned off, so that the state of pin 5 is floating, and at this time, the voltage stored across the sample-and-hold capacitor C86 does not change. Similarly, when the U8 signal has pins 3 and 5, the internal switch corresponding to pin 1 is turned off, and the voltage across the sample-and-hold capacitor C85 does not change. At the end of a period of infrared emission, the received signal is stored and filtered through the sample-and-hold capacitor due to the presence of the sample-and-hold capacitor. A stable clean signal is obtained. The problem that the conventional signal processing circuit samples wrong signal data when the MCU samples electromagnetic interference is effectively solved;
in the emission part, when current passes through the sampling resistor, voltage formed at two ends of the sampling resistor is fed back to a pin 4 of the operational amplifier U7, and then the output voltage of the operational amplifier U7 is adjusted by comparing the voltage with the voltage of a signal source of a pin 3 of the operational amplifier U7; in the transmitting part, a resistor R28 and an MOS (metal oxide semiconductor) tube MN1 are connected in parallel at the rear end of a voltage dividing circuit of a DAC (digital-to-analog converter) signal output end and are used for short-distance fine operation control of infrared signals, when the mechanical installation distance between the infrared transmitting tube and the receiving tube is relatively short, the DAC output signal can only use a very small part of voltage to meet the requirement of the output power of the infrared transmitting tube, but the adjustment range of the DAC is relatively small, and the adjustment precision is not fine enough, so that the MCU is added with one path of current-limiting control output, the current-limiting control output is connected to a control grid electrode of the MOS tube MN1 through a resistor R20 and is connected to the output end of the voltage dividing circuit of the DAC output end through a resistor R28, and after MN1 is switched on, the voltage dividing resistor is added to the voltage dividing circuit of the DAC signal output end, and the output voltage of the DAC is directly divided; in the receiving part, a DC blocking C16 capacitor filters out continuous DC voltage signals generated by sunlight irradiating on the infrared receiving tube; in the receiving part, a feedback resistor R53, a ground resistor R57, an alternating current feedback capacitor C24 and an operational amplifier U6 form an in-phase amplifying circuit; in the receiving part, the electronic analog switch chip U8 performs gating separation of the voltage signals at the time when there is infrared light irradiation and the time when there is no infrared light irradiation.
Example two:
referring to fig. 3, a cloth recognition apparatus using a three-eye infrared sensor, the apparatus comprising:
a transmission circuit unit, which functions as a transmission circuit unit that makes transmission power programmable;
the receiving circuit unit can filter sunlight and separate ambient light from an infrared cloth detection signal;
the receiving circuit unit is specifically: increased signal synchronization separation, become traditional unipolar judgement mode bipolar judgement mode, software is through contrasting two signals, calculates the infrared signal of median difference's mode and obtains the discernment cloth of higher accuracy, simultaneously, because the existence of synchronization separation, the infrared signal that will be used for cloth discernment and environment light signal have carried out the separation, when the sunlight signal is too strong, software can discern, when meetting the receiving sensor signal saturation that the sunlight infrared signal too strong leads to, be used for reminding the user to change operational environment. The signal processing circuit increases the sampling and holding processing mode of the signal. After the signals subjected to synchronous separation are divided into two paths and separated, the two groups of sampling holding capacitors are charged respectively. The MCU only needs to sample the ADC on the two groups of signals when each infrared transmission period is finished. At the same time, the electronic switch can be directed to a switch position without a signal. At the time of ADC sampling, there is no signal input from the outside. External dry reactance crosstalk occurring when the MCU samples the ADC is effectively avoided. The interference immunity of the signal is improved. Moreover, only one ADC sampling is required at the end of the infrared transmission period. The functional requirement on the ADC trigger sampling of the MCU is greatly reduced, and the dependence on high-grade MCU is reduced. In addition, due to the existence of the sampling holding capacitor, the received signal is subjected to filtering processing. Stable signals are obtained, and the problem that the received waveform amplitudes at different moments are different is effectively solved.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A cloth identification circuit using a three-eye infrared sensor is characterized in that: the cloth recognition circuit using the three-eye infrared sensor comprises:
first, the emission part: the first transmitting circuit has 3 infrared transmitting tubes, the transmitting states (respectively corresponding to Q5, Q7 and Q9 in a circuit diagram) are controlled by software, the infrared transmitting tubes transmit in turn in sequence, and only one infrared transmitting tube is allowed to transmit an infrared signal at the same time; because the installation positions and the distances of the sensors are different, the 3 transmitted powers are different, the MCU generates different DAC voltages according to the starting state of the transmitting tube, and controls the output current of the transmitting tube and the output power through the constant current source circuit; the emitting part uses an operational amplifier as a constant current source, a single-chip DAC outputs different voltage signals to an input end of the operational amplifier according to the requirements of a software program, the voltage signals serve as the levels of two ends of a current-limiting resistor of the constant current source, and the magnitude of infrared emission current is determined; the DAC signal output end forms a complete automatic constant current source circuit together with a sampling resistor R50, a current control triode Q6, a triode base current limiting resistor R49, an operational amplifier U7, an operational amplifier input resistor R19 and an operational amplifier input filter capacitor C2 through a voltage division circuit formed by resistors R48 and R14;
II, a receiving part: the C pole of the infrared receiving tube is connected with 5V voltage (the infrared receiving tube 1/2/3), and the E pole is connected with a sampling resistor in series to a signal ground (resistors R56, R55 and R2); when infrared light irradiates, according to the intensity of the infrared light, the infrared receiving tube is conducted, current which is in direct proportion to the intensity of the infrared light flows through the infrared receiving tube, and resistors (R56, R55 and R2) which are connected with the infrared receiving tube in series generate voltage U which is equal to IR because the current flows through two ends; meanwhile, a filter capacitor (C17, C32 and C31) is connected in parallel to sampling resistors (R56, R55 and R2), signals are input to pins 1, 5 and 2 of an electronic analog switch chip U5, software in the MCU generates a group of switch timing signals (2 signals) according to the current sequence of infrared transmitting tubes and sends the switch timing signals to conducting timing control IO pins (pins 9 and 10 of the chip) of the electronic analog switch chip U5; the electronic analog switch chip U5 connects one group of input signal pins 1, 5 and 2 from the outside with the output pin 3 according to the on-off time sequence requirement sent by MCU, then through the current limiting resistor R12 and the blocking capacitor C16, forms a signal voltage at the two resistors of the sampling resistor R17, then through the blocking capacitor C21 and the input resistor R8, sends to the 3 pins of the operational amplifier U6, after the signal is amplified by the operational amplifier U6, the voltage division is carried out through R13 and R59, the 5V signal is converted into 3.3V signal, then through the filter capacitor C23 to the 3 pins of the electronic analog switch chip U8, the synchronous separation signal sent by MCU is input to the 10 pins of the electronic analog switch chip U8, the electronic analog switch chip U8 connects the signal input to the 3 rd pins to the 1 and 5 pins of U8 respectively according to the level state of the 10 pins, wherein the 1 pin signal of U8 passes through the filter circuit composed of R166 and the sampling holding capacitor C85, the infrared-free illumination signal A is sent to a pin 5 of an operational amplifier U13 through an input resistor R115, is output from a pin 7 of an operational amplifier U13 after impedance matching of an operational amplifier U13, is output through an RC filter circuit formed by a resistor R78 and a filter capacitor C25 after being separated, is sent to an ADC module of the MCU for sampling, is sent to a pin 3 of the operational amplifier U13 through an input resistor R116 after the same pin 5 signal of U8 passes through the RC filter circuit formed by a resistor R167 and a sample-hold capacitor C86, is output from a pin 1 of the operational amplifier U13 after impedance matching of the operational amplifier U13, and is sent to the ADC module of the MCU for sampling after passing through an RC filter circuit formed by a resistor R77 and a filter capacitor C26 after being separated.
2. The cloth identification circuit using a three-eye infrared sensor according to claim 1, wherein: in the emission part, when current passes through the sampling resistor, voltage formed at two ends of the sampling resistor is fed back to a pin 4 of the operational amplifier U7, and then the output voltage of the operational amplifier U7 is adjusted by comparing with the voltage of a signal source of a pin 3 of the operational amplifier U7.
3. The cloth identification circuit using a three-eye infrared sensor according to claim 1, wherein: in the transmitting part, a resistor R28 and an MOS (metal oxide semiconductor) tube MN1 are connected in parallel at the rear end of a voltage dividing circuit of a DAC (digital-to-analog converter) signal output end and used for performing close-range fine operation control on infrared signals, when the mechanical installation distance between the infrared transmitting tube and the receiving tube is relatively short, the DAC output signals can only use a very small part of voltage to meet the requirement on the output power of the infrared transmitting tube, but the adjustment range of the DAC is relatively small, and the adjustment precision is not fine enough, so that the MCU is additionally provided with one path of current-limiting control output, the current-limiting control output is connected to a control grid electrode of the MOS tube MN1 through the resistor R20 and then is connected to the voltage dividing circuit output end of the DAC through the resistor R28, and after the MN1 is switched on, the voltage dividing resistor is equivalently added to the voltage dividing circuit of the DAC signal output end, and the output voltage of the DAC is directly subjected to further voltage division.
4. The cloth identification circuit using a three-eye infrared sensor according to claim 1, wherein: in the receiving part, a DC blocking C16 capacitor filters out continuous DC voltage signals generated by sunlight irradiating on the infrared receiving tube.
5. The cloth identification circuit using a three-eye infrared sensor according to claim 1, wherein: in the receiving part, a feedback resistor R53, a ground resistor R57, an alternating current feedback capacitor C24 and an operational amplifier U6 form an in-phase amplifying circuit.
6. The cloth identification circuit using a three-eye infrared sensor according to claim 1, wherein: in the receiving part, an electronic analog switch chip U8 gates and separates voltage signals at the time of irradiation of infrared light and the time of no irradiation of infrared light.
7. The utility model provides an use cloth recognition device of three light eye infrared sensor which characterized in that: the device includes:
a transmission circuit unit, which functions as a transmission circuit unit that makes transmission power programmable;
and the receiving circuit unit can filter sunlight and separate ambient light from the infrared cloth detection signal.
8. The cloth recognition apparatus using a three-eye infrared sensor according to claim 7, wherein: the receiving circuit unit is specifically: increased signal synchronization separation, become traditional unipolar judgement mode bipolar judgement mode, software is through contrasting two signals, calculates the infrared signal of median difference's mode and obtains the discernment cloth of higher accuracy, simultaneously, because the existence of synchronization separation, the infrared signal that will be used for cloth discernment and environment light signal have carried out the separation, when the sunlight signal is too strong, software can discern, when meetting the receiving sensor signal saturation that the sunlight infrared signal too strong leads to, be used for reminding the user to change operational environment.
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