CN212206122U - Object detection circuit and object detection device - Google Patents
Object detection circuit and object detection device Download PDFInfo
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- CN212206122U CN212206122U CN202020930784.9U CN202020930784U CN212206122U CN 212206122 U CN212206122 U CN 212206122U CN 202020930784 U CN202020930784 U CN 202020930784U CN 212206122 U CN212206122 U CN 212206122U
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Abstract
The utility model provides an object detection circuit and an object detection device, wherein the object detection circuit comprises a controller, an infrared emission circuit, an infrared receiving circuit and a signal processing circuit; the controlled end of the infrared transmitting circuit is connected with the instruction output end of the controller, the first connecting end of the infrared transmitting circuit is connected with a power supply module, and the second connecting end of the infrared transmitting circuit is grounded; the input end of the infrared receiving circuit is connected with the power supply module, and the output end of the infrared receiving circuit is connected with the input end of the signal processing circuit; and the output end of the signal processing circuit is connected with the signal input end of the controller. The technical scheme of the utility model, whether there is the testee in can accurate judgement predetermines the region, and the reliability is high.
Description
Technical Field
The utility model relates to an infrared detection technology field, in particular to detection circuitry of object and detection device of object.
Background
Infrared, also known as infrared light, includes properties of reflection, refraction, scattering, interference, absorption, etc., and can be used to measure the distance between two objects.
However, infrared ranging is often suitable for measuring the distance between two objects that are far apart, but not for measuring the distance between two objects that are near apart, for example, assuming that the object to be measured is only 3cm away from the infrared emitting device and the transmission speed C of the infrared light is equal to about 3 x 10^8m/S, then the transmission time T of the infrared light is 2L/C (2 x 3 x 10^ 2))/(3 x 10^ 8)/(3 x 10^ 10) S is 0.2ns (nanoseconds), and conversely, if the transmission time of the infrared light between the object to be measured and the infrared emitting device is calculated by a controller such as a single chip microcomputer, then the distance between the object to be measured and the infrared emitting device is calculated based on the transmission speed of the infrared light and the measured transmission time, since the distance between the object and the infrared emitting device is too short, the single chip microcomputer is difficult to realize in calculating the transmission time of the infrared light between the measured object and the infrared emitting device, so that whether the measured object exists or not cannot be accurately judged.
SUMMERY OF THE UTILITY MODEL
The utility model provides a detection circuitry of object and detection device of object aims at whether there is the measured object in the accurate judgement preset area.
In order to achieve the above object, the present invention provides a detection circuit for an object, the detection circuit for an object comprises a controller, an infrared transmitting circuit, an infrared receiving circuit and a signal processing circuit;
the controlled end of the infrared transmitting circuit is connected with the instruction output end of the controller, the first connecting end of the infrared transmitting circuit is connected with a power supply module, and the second connecting end of the infrared transmitting circuit is grounded; the input end of the infrared receiving circuit is connected with the power supply module, and the output end of the infrared receiving circuit is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the signal input end of the controller;
the infrared transmitting circuit is used for receiving the control instruction output by the controller and sending an infrared signal to a preset area according to the control instruction;
the infrared receiving circuit is used for outputting a voltage signal corresponding to the infrared signal when receiving the infrared signal sent by the infrared transmitting circuit;
and the signal processing circuit is used for receiving the voltage signal output by the infrared receiving circuit and outputting a level signal indicating that a preset area has a measured object to the controller.
Optionally, the infrared transmitting circuit includes a switch circuit and an infrared signal output circuit;
the input end of the infrared signal output circuit is a first connection end of the infrared emission circuit, and the output end of the infrared signal output circuit is connected with the input end of the switch circuit; the controlled end of the switch circuit is the controlled end of the infrared transmitting circuit, and the output end of the switch circuit is the second connecting end of the infrared transmitting circuit.
Optionally, the switch circuit includes a first resistor and a first transistor;
the first end of the first resistor is a controlled end of the switch circuit, and the second end of the first resistor is connected with the controlled end of the first transistor;
the first connection end of the first transistor is the input end of the switch circuit, and the second connection end of the first transistor is the output end of the switch circuit.
Optionally, the infrared signal output circuit includes an infrared diode and a second resistor;
the negative pole of the infrared diode is the output end of the infrared signal output circuit, the positive pole of the infrared diode is connected with the second end of the second resistor, and the first end of the second resistor is the input end of the infrared signal output circuit.
Optionally, the infrared receiving circuit includes a phototriode, a third resistor, a fourth resistor, and a first capacitor;
the collector of the phototriode is the input end of the infrared receiving circuit, and the emitter of the phototriode is connected with the first end of the third resistor and the first end of the first capacitor; the second end of the third resistor is grounded;
the second end of the first capacitor is the output end of the infrared receiving circuit and is connected with the first end of the fourth resistor, and the second end of the fourth resistor is grounded.
Optionally, the signal processing circuit includes an operational amplifier circuit and a comparator circuit;
the input end of the operational amplification circuit is the input end of the signal processing circuit, and the output end of the operational amplification circuit is connected with the first input end of the comparison circuit; the second input end of the comparison circuit is connected with a reference signal output end to receive the output reference voltage signal; the output end of the comparison circuit is the output end of the signal processing circuit.
Optionally, the operational amplifier circuit includes a fifth resistor, a sixth resistor, and a first operational amplifier;
a positive input end of the first operational amplifier is an input end of the operational amplifier circuit, a negative input end of the first operational amplifier is connected with a first end of the fifth resistor and a first end of the sixth resistor, and a second end of the fifth resistor is grounded;
the output end of the first operational amplifier is the output end of the operational amplification circuit and is connected with the second end of the sixth resistor.
Optionally, the comparison circuit includes a seventh resistor, an eighth resistor, a ninth resistor, and a second operational amplifier;
a first end of the seventh resistor is a first input end of the comparison circuit, and a second end of the seventh resistor is connected to the positive input end of the second operational amplifier and the first end of the eighth resistor; the negative input end of the second operational amplifier is the second input end of the comparison circuit;
the output end of the second operational amplifier is the output end of the comparison circuit, and is connected with the second end of the eighth resistor and the first end of the ninth resistor, and the second end of the ninth resistor is grounded.
Optionally, the detection circuit of the object further includes a reference voltage generation circuit;
the input end of the reference voltage generating circuit is connected with the power supply module, and the output end of the reference voltage generating circuit is the reference signal output end.
In order to achieve the above object, the present invention further provides a device for detecting an object, wherein the device for detecting an object comprises the detection circuit of an object as described above.
The technical scheme of the utility model, infrared emission circuit is to predetermineeing regional transmission infrared signal according to the control command of controller, if infrared receiving circuit receives the infrared signal through the testee reflection, infrared receiving circuit then produces corresponding voltage signal to signal processing circuit according to received infrared signal, and signal processing circuit produces according to this and instructs predetermineeing regional level signal to the controller that exists the testee to supply the controller to carry out corresponding operation. So set up, even the measured object is extremely short with infrared emission circuit's distance, the system homoenergetic accurately judges whether to have the measured object in predetermineeing the region, and the reliability of detecting is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a block diagram of an embodiment of a detection circuit for detecting an object according to the present invention;
FIG. 2 is a block diagram of another embodiment of the object detection circuit of the present invention;
fig. 3 is a schematic circuit diagram of an embodiment of the object detection circuit of the present invention;
FIG. 4 is a block diagram of a detection circuit for detecting an object according to another embodiment of the present invention;
fig. 5 is a schematic circuit diagram of another embodiment of the object detection circuit of the present invention;
fig. 6 is a schematic circuit diagram of a further embodiment of the object detection circuit of the present invention.
The reference numbers illustrate:
| 10 | |
20 | |
| 30 | Infrared |
40 | |
| 50 | Reference |
201 | |
| 202 | Infrared |
401 | |
| 402 | Comparison circuit | R1～R13 | First to thirteenth resistors |
| U1 | A first operational amplifier | U2 | A second operational amplifier |
| Q1 | A first transistor | C1～C3 | First to third capacitors |
| VCC | Power supply module | D3～D8 | Third to eighth diodes |
| J1 | First connector | J2 | Second connector |
| D1 | Infrared diode | D2 | Photoelectric triode |
| K | Object to be measured | GND | Ground |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a detection circuitry of object.
Referring to fig. 1, the detection circuit of the object includes a controller 10, an infrared transmitting circuit 20, an infrared receiving circuit 30, and a signal processing circuit 40; the controlled end of the infrared transmitting circuit 20 is connected with the instruction output end of the controller 10, the first connecting end of the infrared transmitting circuit 20 is connected with a power supply module VCC, and the second connecting end of the infrared transmitting circuit 20 is grounded; the input end of the infrared receiving circuit 30 is connected to the power supply module VCC, and the output end of the infrared receiving circuit 30 is connected to the input end of the signal processing circuit 40; an output of the signal processing circuit 40 is connected to a signal input of the controller 10.
The controller 10 may be a single chip, a DSP or a microprocessor such as an FPGA.
The infrared emitting circuit 20 may be implemented by a circuit including an infrared diode and a transistor. The infrared transmitting circuit 20 is configured to transmit an infrared signal to a preset area at regular time or in real time according to a control instruction of the controller 10.
The infrared receiving circuit 30 may be implemented by a circuit composed of phototransistors. The infrared receiving circuit 30 is configured to output a voltage signal corresponding to the received infrared signal when receiving the infrared signal reflected by the object to be measured in the preset area.
The signal processing circuit 40 may be composed of an operational amplifier circuit and a comparator circuit. The signal processing circuit 40 is configured to receive the voltage signal output by the infrared receiving circuit 30, and output a level signal indicating that the object to be measured exists in the preset area to the controller 10.
The utility model discloses a detection circuitry of object can be applied to some and need detect certain specific area or certain specific position whether have the application scene of testee, for example, in being applied to ice machine automatic check system with this circuit, whether having placed the cup through this circuit detection certain specific position, if detect this specific position and placed the cup, then the water storage device or the automatic opening of ice storage device of control system releases water or ice to the cup; and if the specific position is detected not to place a cup, the water storage device or the ice storage device of the control system is automatically closed to stop releasing water or ice.
The specific working principle is as follows: the controller 10 controls the infrared transmitting circuit 20 to transmit an infrared signal to a predetermined area at regular time or in real time to detect whether the object K to be detected exists in the predetermined area. If the object to be measured K exists in the preset area, the infrared signal emitted by the infrared emission circuit 20 is reflected to the infrared receiving circuit 30 by the object to be measured K and is received by the phototriode in the infrared receiving circuit 30; if the object K to be measured does not exist in the preset area, the infrared signal emitted by the infrared emitting circuit 20 cannot be reflected to the infrared receiving circuit 30 through the object K to be measured. If the phototriode of the infrared receiving circuit 30 receives the infrared signal reflected by the object K to be measured, the collector and emitter of the phototriode form a current, so that the magnitude of the voltage signal output to the signal processing circuit 40 changes significantly. Therefore, once the infrared receiving circuit 30 receives the infrared signal reflected by the object to be measured K, the infrared receiving circuit 30 changes the magnitude of the voltage signal output to the signal processing circuit 40, for example, if the infrared signal reflected by the object to be measured K is not received, the value of the voltage signal output to the signal processing circuit 40 by the infrared receiving circuit 30 is small, such as about 100mV, 90mV, 80mV, and the like; when the infrared signal reflected by the object K to be measured is received, the value of the voltage signal output from the infrared receiving circuit 30 to the signal processing circuit 40 is large, such as 300mV, 200mV, 160mV, and the like. The signal processing circuit 40 outputs a corresponding logic level to the controller 10 according to the received voltage signal, for example, if the object K to be measured does not exist in the preset region, the voltage signal of 90mV received by the signal processing circuit 40, and the signal processing circuit 40 outputs an electrical signal of a low level to the controller 10; if the object K exists in the predetermined area, the voltage signal of 200mV is received by the signal processing circuit 40, and the signal processing circuit 40 outputs a high-level electrical signal to the controller 10. The controller 10 determines whether the object to be measured K exists in the preset area according to the level of the received electrical signal, and performs a corresponding operation, for example, if the controller 10 receives the electrical signal with a high level, the controller 10 determines that the object to be measured K exists in the preset area, and the controller 10 controls the ice storage device or the water storage device to be automatically opened, so that the ice or the water cup is released into the cup; if the controller 10 receives the low-level electrical signal, the controller 10 determines that the object K to be measured does not exist in the preset area, and the controller 10 controls the ice storage device or the water storage device to automatically close. So set up, when whether exist the testee in the detection preset area, do not receive the restriction of the distance between testee K and the infrared emission circuit 20 and just can be accurate whether exist the testee K in the detection preset area, that is to say, even the distance of testee K and infrared emission circuit 20 is very short, whether the testee K exists in the accurate judgement preset area of controller 10 homoenergetic. Of course, the utility model discloses also can be applied to the measuring object K and infrared emission circuit 20 in the application scene far away of distance, here is not limited.
The technical scheme of the utility model, infrared transmitting circuit 20 is to predetermineeing regional transmission infrared signal according to controller 10's control command, if infrared receiving circuit 30 receives the infrared signal through testee K reflection, infrared receiving circuit 30 then produces corresponding voltage signal to signal processing circuit 40 according to received infrared signal, and signal processing circuit 40 then outputs the level signal to controller 10 that indicates to predetermine regional existence testee in view of the above, for controller 10 carries out corresponding operation. So set up, even the measured object K is extremely short with infrared emission circuit 20's distance, controller 10 homoenergetic accurately judges whether to exist measured object K in predetermineeing the region, and the reliability that detects is high.
Optionally, referring to fig. 2, in an embodiment, the infrared transmitting circuit 20 includes a switch circuit 201 and an infrared signal output circuit 202; the input end of the infrared signal output circuit 202 is a first connection end of the infrared transmitting circuit 20, that is, the input end of the infrared signal output circuit 202 is connected to a power supply module VCC; the output end of the infrared signal output circuit 202 is connected with the input end of the switch circuit 201; the controlled end of the switch circuit 201 is the controlled end of the infrared emission circuit 20; the output terminal of the switch circuit 201 is the second connection terminal of the infrared transmitting circuit 20, i.e. the output terminal of the switch circuit 201 is grounded.
The switch circuit 201 may be implemented by a circuit composed of a single transistor or a plurality of transistors, such as a circuit composed of MOS transistors and triodes.
The infrared signal output circuit 202 may be implemented by a circuit composed of infrared diodes.
The specific working principle of the infrared transmitting circuit 20 is as follows: the controller 10 outputs a control instruction for controlling the switch circuit 201 to be turned on to the switch circuit 201 in real time or at regular time, so as to control the switch circuit 201 to be turned on in real time or at regular time. When the switch circuit 201 is turned on, the power supply module VCC is grounded through the infrared signal output circuit 202 and the turned-on switch circuit 201 to form a loop, and an infrared diode in the infrared signal output circuit 202 transmits an infrared signal to a preset area to detect whether the preset area has the object to be detected K in real time or at regular time.
Optionally, referring to fig. 3, in an embodiment, the switch circuit 201 includes a first resistor R1 and a first transistor Q1; the first end of the first resistor R1 is the controlled end of the switch circuit 201; a second terminal of the first resistor R1 is connected to the controlled terminal of the first transistor Q1; the first connection end of the first transistor Q1 is the input end of the switch circuit 201, i.e., the first connection end of the first transistor Q1 and the output end of the infrared signal output circuit 202; the second connection terminal of the first transistor Q1 is the output terminal of the switch circuit 201, i.e., the second connection terminal of the first transistor Q1 is grounded.
The first transistor may be an NPN transistor or a PNP transistor, or may be another transistor that can be implemented. For convenience of description, the first transistor is an NPN transistor in the present embodiment.
The specific operating principle of the switching circuit 201 is as follows: the NPN transistor Q1 is turned on according to the control command of high level output from the controller 10. When the NPN transistor Q1 is turned on, the power supply module VCC and the infrared signal output circuit 202 are grounded to form a loop, and an infrared diode in the infrared signal output circuit 202 emits an infrared signal to a predetermined region.
In other embodiments, if the first transistor Q1 is a PNP transistor, the PNP transistor Q1 is turned on when receiving a low control command from the controller 10. When the PNP transistor Q1 is turned on, the power supply module VCC and the infrared signal output circuit 202 are grounded to form a loop, and the infrared diode in the infrared signal output circuit 202 emits an infrared signal to the predetermined area.
Optionally, referring to fig. 3, in an embodiment, the infrared signal output circuit 202 includes an infrared diode D1 and a second resistor R2; the cathode of the infrared diode D1 is the output end of the infrared signal output circuit 202; the anode of the infrared diode D1 is connected to the second end of the second resistor R2; the first end of the second resistor R2 is the input end of the infrared signal output circuit 202.
The infrared diode D1 belongs to a diode-type light emitting device, and is used to directly convert electric energy into infrared rays and radiate the infrared rays.
The operating principle of the infrared signal output circuit 202 is as follows: if the switch circuit 201 is turned on under the control command of the controller 10, a forward voltage is formed across the infrared diode D1 and a forward current is generated, and at this time, the infrared diode D1 emits an infrared signal to the predetermined area to detect whether the object K is present in the predetermined area.
Optionally, referring to fig. 3, in an embodiment, the infrared receiving circuit 30 includes a phototransistor D2, a third resistor R3, a fourth resistor R4, and a first capacitor C1; the collector of the phototransistor D2 is the input terminal of the infrared receiving circuit 202; an emitter of the phototransistor D2 is connected to the first terminal of the third resistor R3 and the first terminal of the first capacitor C1; the second end of the third resistor R3 is grounded; the second terminal of the first capacitor C1 is the output terminal of the ir receiving circuit 30, and is connected to the first terminal of the fourth resistor R4, and the second terminal of the fourth resistor R4 is grounded.
Among them, the phototriode D2 is also called a phototriode, and its current is controlled by external light, which is a semiconductor photoelectric device.
The specific working principle of the infrared receiving circuit 30 is as follows: when the infrared transmitting circuit 20 transmits an infrared signal to the preset area, if the object K to be measured exists in the preset area, the infrared signal transmitted by the infrared transmitting circuit 20 can be reflected by the object K to be measured and received by the phototriode D2, so that the phototriode D2 is triggered to be turned on. When the phototransistor D2 is turned on, a larger voltage is generated at the first terminal of the third resistor R3, for example, voltages of about 300mV, 200mV, and 160mV are generated at the first terminal of the third resistor R3, and the voltage generated at the first terminal of the third resistor R3 is filtered by the filter circuit formed by the fourth resistor R4 and the first capacitor C1 and then is input to the signal processing circuit 40. If the object to be measured K does not exist in the predetermined region, the infrared signal emitted by the infrared emitting circuit 20 cannot be reflected and received by the phototransistor D2, and the phototransistor D2 is turned off, so that the voltage at the first end of the third resistor R3 is relatively low, for example, the voltage at the first end of the third resistor R3 is about 100mV, 90mV, 80mV, and the like.
Optionally, referring to fig. 2, in an embodiment, the signal processing circuit 40 includes an operational amplifier circuit 401 and a comparator circuit 402; the input terminal of the operational amplifier 401 is the input terminal of the signal processing circuit 40; the output end of the operational amplifier circuit 401 is connected to the first input end of the comparator circuit 402; a second input terminal of the comparison circuit 402 is connected to a reference signal output terminal Vref to receive the output reference voltage signal; the output of the comparison circuit 402 is the output of the signal processing circuit 40, i.e. the output of the comparison circuit 402 is connected to the signal input of the controller 10.
The comparison circuit 402 has the following characteristics: if the value of the voltage signal at the first input terminal of the comparing circuit 402 is greater than the value of the voltage signal at the second input terminal thereof, the comparing circuit 402 outputs a high-level electrical signal; if the voltage signal at the first input terminal of the comparing circuit 402 has a value smaller than that at the second input terminal, the comparing circuit 402 outputs an electrical signal with a low level.
The signal processing circuit 40 operates as follows: the voltage signal output by the infrared receiving circuit 30 is amplified by the operational amplifier circuit 401 and then input to the first input terminal of the comparator circuit 402, and the second input terminal of the comparator circuit 402 receives a reference voltage signal, for example, a reference voltage signal of 1.5V. It can be understood that, if the object to be measured K exists in the preset region, the infrared signal emitted by the infrared emitting circuit 20 can be reflected to the infrared receiving circuit 30 through the object to be measured K, then the voltage signal output to the operational amplifying circuit 401 by the infrared receiving circuit 30 is larger, for example, 200mV, and after being amplified by the operational amplifying circuit 401, for example, to 2V, the voltage signal is input to the first input end of the comparing circuit 402; if the object K to be measured does not exist in the preset region, the infrared receiving circuit 30 cannot receive the infrared signal emitted by the infrared emitting circuit 20, then the voltage signal output by the infrared receiving circuit 30 to the operational amplifying circuit 401 is small, for example, 90mV, and after the voltage signal is emitted by the operational amplifying circuit 401, for example, after the voltage signal is amplified to 0.9V, the voltage signal is input to the first input terminal of the comparing circuit 402. Therefore, if the value of the voltage signal received by the first input terminal of the comparison circuit 402 and amplified by the operational amplifier circuit 401 is greater than the value of the reference voltage signal received by the second input terminal thereof, the comparison circuit 402 outputs a high-level signal to the controller 10, and the controller 10 can determine that the object K to be measured exists in the predetermined area according to the received high-level signal. If the value of the voltage signal received by the first input terminal of the comparison circuit 402 is smaller than the value of the reference voltage signal received by the second input terminal thereof, the comparison circuit 402 outputs a low-level signal to the controller 10, and the controller 10 can determine that the object K to be measured does not exist in the preset area according to the received low-level signal.
Optionally, referring to fig. 3, in an embodiment, the operational amplifier circuit 401 includes a fifth resistor R5, a sixth resistor R6, and a first operational amplifier U1; the positive input terminal of the first operational amplifier U1 is the input terminal of the operational amplifier circuit 401; the negative input terminal of the first operational amplifier U1 is connected to the first terminal of the fifth resistor R5 and the first terminal of the sixth resistor R6; and a second terminal of the fifth resistor R5 is grounded; the output terminal of the first operational amplifier U1 is the output terminal of the operational amplifier circuit 401, and is connected to the second terminal of the sixth resistor R6.
The operational amplifier circuit 401 is configured to amplify the voltage signal output by the infrared receiving circuit 30, for example, amplify the voltage signal output by the infrared receiving circuit 30 by 10 times, 15 times, and the like, and input the amplified voltage signal to the first input terminal of the comparator circuit 402, so as to improve the accuracy of determining whether the object K exists in the preset area. The first operational amplifier U1 may be, but is not limited to, a model LMV 324.
Optionally, referring to fig. 3, in an embodiment, the comparing circuit 402 includes a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a second operational amplifier U2; a first terminal of the seventh resistor R7 is a first input terminal of the comparison circuit 402; a second end of the seventh resistor R7 is connected to the positive input terminal of the second operational amplifier U2 and the first end of the eighth resistor R8; the negative input of the second operational amplifier U2 is the second input of the comparison circuit 402; the output terminal of the second operational amplifier U2 is the output terminal of the comparison circuit 402, and is connected to the second terminal of the eighth resistor R8 and the first terminal of the ninth resistor R9, and the second terminal of the ninth resistor R9 is grounded.
In this embodiment, the positive input terminal of the second operational amplifier U2 receives the voltage signal amplified by the operational amplifier circuit 401, and the negative input terminal of the second operational amplifier U2 receives the reference voltage signal output by the reference signal output terminal Vref. If the value of the voltage signal at the positive input terminal of the second operational amplifier U2 is greater than the value of the reference voltage signal at the negative input terminal thereof, the second operational amplifier U2 outputs a high level signal to the controller 10, and the controller 10 determines that the object to be tested K exists in the predetermined area according to the high level signal. If the value of the voltage signal at the positive input terminal of the second operational amplifier U2 is smaller than the value of the reference voltage signal at the negative input terminal thereof, the second operational amplifier U2 outputs a low level signal to the controller 10, and the controller 10 determines that the object K to be tested does not exist in the predetermined area. The second operational amplifier U2 may be, but is not limited to, a model LMV 324.
When the object to be measured K exists in the preset area, the value of the voltage signal output by the operational amplifier circuit 401 to the positive input end of the second operational amplifier U2 is greater than the value of the reference voltage signal received by the negative input end of the second operational amplifier U2; when the object to be measured K does not exist in the preset region, the value of the voltage signal output by the operational amplifier circuit 401 to the positive input terminal of the second operational amplifier U2 is smaller than the value of the reference voltage signal received by the negative input terminal of the second operational amplifier U2.
Optionally, referring to fig. 4, in an embodiment, the object detection circuit further includes a reference voltage generation circuit 50; the input terminal of the reference voltage generating circuit 50 is connected to the power supply module VCC, and the output terminal of the reference voltage generating circuit 50 is the reference signal output terminal Vref.
The reference voltage generating circuit 50 may be formed of a single or a plurality of resistors. The reference voltage generating circuit 50 is used for providing a reference voltage signal to a second input terminal of the comparing circuit 402.
Optionally, referring to fig. 5, in an embodiment, the reference circuit generating circuit 50 includes a tenth resistor R10, an eleventh resistor R11, and a twelfth resistor R12; a first terminal of the tenth resistor R10 is an input terminal of the reference voltage generating circuit 50; a second terminal of the tenth resistor R10 is an output terminal of the reference voltage generating circuit 50, and is connected to a first terminal of the eleventh resistor R11 and a first terminal of the twelfth resistor R12; the second terminal of the eleventh resistor R11 and the second terminal of the twelfth resistor R12 are both grounded.
In this embodiment, after the voltage output by the power supply module VCC is divided by the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12, a reference voltage signal is provided to the second input terminal of the comparison circuit 402, for example, the voltage output by the power supply module VCC is set to be 5V, the resistance of the tenth resistor R10 is 30.1K Ω, the resistance of the eleventh resistor R11 is 26.1K Ω, and the resistance of the twelfth resistor R12 is 26.1K Ω, so that the reference voltage signal Vref of the second input terminal of the comparison circuit 402 is 5 ═ 1.512V (26.1/2)/(26.1/2+ 30.1).
In order to better illustrate the inventive concept of the present invention, the following describes the technical solution of the present invention in its entirety with reference to fig. 5 and 6.
In this embodiment, the first transistor Q1 is exemplified as an NPN transistor.
The specific working principle of the object detection circuit is as follows: the controller 10 outputs a high-level control command to the base of the NPN transistor Q1 in real time or at regular time intervals to trigger the NPN transistor Q1 to turn on. When the NPN transistor Q1 is turned on, a forward voltage is formed across the infrared diode D1 and a forward current is generated, and the infrared diode D1 emits an infrared signal to the predetermined area to detect whether the object K exists in the predetermined area.
If the object K exists in the predetermined area, the infrared signal emitted from the infrared diode D2 can be reflected by the object K to the phototransistor D2 to trigger the conduction of the phototransistor D2. When the phototransistor D2 is turned on, the first terminal of the third resistor R3 generates a voltage, for example, a voltage of about 300mV, 200mV, and 160 mV. The first operational amplifier U1 amplifies the voltage formed at the first end of the third resistor R3 and transmits the voltage signal to the positive input end of the second operational amplifier U2, for example, when the phototransistor D2 is turned on, the voltage formed at the first end of the third resistor R3 is 200mV, and the voltage is amplified by the first operational amplifier U1 and then the voltage input to the positive input end of the second operational amplifier U2 is 2V. The negative input terminal of the second operational amplifier U2 receives a reference voltage signal, which is formed by the voltage division of the power supply module VCC through the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12, for example, the value of the reference voltage signal is 1.5V. At this time, the value of the voltage signal at the positive input terminal of the second operational amplifier U2 is greater than the value of the reference voltage signal at the negative input terminal thereof, and the second operational amplifier U2 outputs a high level signal to the controller 10 to inform the controller 10 that the object to be tested K exists in the predetermined area.
If the object to be measured K does not exist in the preset area, the infrared signal emitted by the infrared diode D1 cannot be reflected to the phototransistor D2, and the light emitting triode D2 remains off. When the phototransistor D2 is turned off, the voltage at the first terminal of the third resistor R3 is small, such as 100mV, 90mV, 80mV, etc. The voltage at the first end of the third resistor R3 amplified by the first operational amplifier U1 is also lower than the voltage transmitted to the positive input end of the second operational amplifier U2. for example, if the voltage at the first end of the third resistor R3 is 90mV, the voltage amplified by the first operational amplifier U1 is 0.9V, and then the voltage input to the positive input end of the second operational amplifier U2 is 0.9V. The negative input terminal of the second operational amplifier U2 receives a reference voltage signal, which is formed by the voltage division of the power supply module VCC through the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12, for example, the value of the reference voltage signal is 1.5V. At this time, the value of the voltage signal at the positive input terminal of the second operational amplifier U2 is smaller than the value of the reference voltage signal at the negative input terminal thereof, and the second operational amplifier U2 outputs a low level signal to the controller 10 to inform the controller 10 that the object K to be tested does not exist in the predetermined area. When an object to be tested K exists in the preset area, the value of the voltage signal output by the first operational amplifier U1 to the second operational amplifier U2 is greater than the value of a reference voltage signal formed by the voltage division of the power supply module VCC through the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12; when the object to be tested K does not exist in the preset area, the value of the voltage signal output by the first operational amplifier U1 to the second operational amplifier U2 is smaller than the value of the reference voltage signal formed by the voltage division of the power supply module VCC through the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12.
In an alternative embodiment of the present invention, the ir transmitting circuit 20 and the ir receiving circuit 30 can be disposed on a small board, and the signal processing circuit 40 and the controller 10 can be disposed on another small board, and the two small boards are connected by the first connector J1 and the second connector J2. Then, after the first connector J1 is connected to the second connector PIN-to-PIN, the controller 10 is connected to the controlled terminal of the infrared transmitting circuit 20 through the thirteenth resistor R13, and the output terminal of the infrared receiving circuit 30 is connected to the input terminal of the signal processing circuit 40, so as to realize the signal transmission of the circuits on the two small boards.
Further, the detection circuit of the object further comprises a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8 for resisting disturbance; the anode of the third diode D3 and the anode of the fifth diode D5 are connected to the output terminal of the ir receiving circuit 30, and the cathode of the third diode D3 and the cathode of the fifth diode D5 are connected to the power supply module VCC. The anode of the fourth diode D4 and the anode of the sixth diode D6 are grounded, and the cathode of the fourth diode D4 and the cathode of the sixth diode D6 are connected to the output terminal of the infrared receiving circuit 30. The anode of the seventh diode D7 is connected to the command output terminal of the controller 10, and the cathode of the seventh diode D7 is connected to the power supply module VCC; the anode of the eighth diode D8 is grounded, and the cathode of the eighth diode D8 is connected to the command output terminal of the controller 10.
The utility model also provides an object detection device, which comprises the object detection circuit; the detailed structure of the detection circuit of the object can refer to the above embodiments, and is not described herein again; it can be understood that, because the utility model discloses a detection circuitry of above-mentioned object has been used among the detection device of object, consequently, the utility model discloses detection device's of object embodiment includes all technical scheme of the whole embodiments of detection circuitry of above-mentioned object, and the technological effect that reaches is also identical, no longer gives unnecessary details here.
The above is only the optional embodiment of the present invention, and not the scope of the present invention is limited thereby, all the equivalent structure changes made by the contents of the specification and the drawings are utilized under the inventive concept of the present invention, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (10)
1. The detection circuit of an object is characterized by comprising a controller, an infrared transmitting circuit, an infrared receiving circuit and a signal processing circuit;
the controlled end of the infrared transmitting circuit is connected with the instruction output end of the controller, the first connecting end of the infrared transmitting circuit is connected with a power supply module, and the second connecting end of the infrared transmitting circuit is grounded; the input end of the infrared receiving circuit is connected with the power supply module, and the output end of the infrared receiving circuit is connected with the input end of the signal processing circuit; the output end of the signal processing circuit is connected with the signal input end of the controller;
the infrared transmitting circuit is used for receiving the control instruction output by the controller and sending an infrared signal to a preset area according to the control instruction;
the infrared receiving circuit is used for outputting a voltage signal corresponding to the infrared signal when receiving the infrared signal sent by the infrared transmitting circuit;
and the signal processing circuit is used for receiving the voltage signal output by the infrared receiving circuit and outputting a level signal indicating that a preset area has a measured object to the controller.
2. The detection circuit of an object according to claim 1, wherein the infrared emission circuit includes a switching circuit and an infrared signal output circuit;
the input end of the infrared signal output circuit is a first connection end of the infrared emission circuit, and the output end of the infrared signal output circuit is connected with the input end of the switch circuit; the controlled end of the switch circuit is the controlled end of the infrared transmitting circuit, and the output end of the switch circuit is the second connecting end of the infrared transmitting circuit.
3. The detection circuit of an object according to claim 2, wherein the switching circuit comprises a first resistor and a first transistor;
the first end of the first resistor is a controlled end of the switch circuit, and the second end of the first resistor is connected with the controlled end of the first transistor;
the first connection end of the first transistor is the input end of the switch circuit, and the second connection end of the first transistor is the output end of the switch circuit.
4. The detection circuit of an object according to claim 2, wherein the infrared signal output circuit includes an infrared diode and a second resistor;
the negative pole of the infrared diode is the output end of the infrared signal output circuit, the positive pole of the infrared diode is connected with the second end of the second resistor, and the first end of the second resistor is the input end of the infrared signal output circuit.
5. The detection circuit of an object according to claim 1, wherein the infrared receiving circuit comprises a phototransistor, a third resistor, a fourth resistor, and a first capacitor;
the collector of the phototriode is the input end of the infrared receiving circuit, and the emitter of the phototriode is connected with the first end of the third resistor and the first end of the first capacitor; the second end of the third resistor is grounded;
the second end of the first capacitor is the output end of the infrared receiving circuit and is connected with the first end of the fourth resistor, and the second end of the fourth resistor is grounded.
6. The detection circuit of an object according to claim 1, wherein the signal processing circuit includes an operational amplifier circuit and a comparator circuit;
the input end of the operational amplification circuit is the input end of the signal processing circuit, and the output end of the operational amplification circuit is connected with the first input end of the comparison circuit; the second input end of the comparison circuit is connected with a reference signal output end to receive the output reference voltage signal; the output end of the comparison circuit is the output end of the signal processing circuit.
7. The detection circuit of an object according to claim 6, wherein the operational amplifier circuit comprises a fifth resistor, a sixth resistor and a first operational amplifier;
a positive input end of the first operational amplifier is an input end of the operational amplifier circuit, a negative input end of the first operational amplifier is connected with a first end of the fifth resistor and a first end of the sixth resistor, and a second end of the fifth resistor is grounded;
the output end of the first operational amplifier is the output end of the operational amplification circuit and is connected with the second end of the sixth resistor.
8. The detection circuit of an object according to claim 6, wherein the comparison circuit comprises a seventh resistor, an eighth resistor, a ninth resistor, and a second operational amplifier;
a first end of the seventh resistor is a first input end of the comparison circuit, and a second end of the seventh resistor is connected to the positive input end of the second operational amplifier and the first end of the eighth resistor; the negative input end of the second operational amplifier is the second input end of the comparison circuit;
the output end of the second operational amplifier is the output end of the comparison circuit, and is connected with the second end of the eighth resistor and the first end of the ninth resistor, and the second end of the ninth resistor is grounded.
9. The object detection circuit according to claim 8, further comprising a reference voltage generation circuit;
the input end of the reference voltage generating circuit is connected with the power supply module, and the output end of the reference voltage generating circuit is the reference signal output end.
10. An apparatus for detecting an object, characterized in that the apparatus comprises a circuit for detecting an object according to any one of claims 1-9.
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|---|---|---|---|
| CN202020930784.9U CN212206122U (en) | 2020-05-27 | 2020-05-27 | Object detection circuit and object detection device |
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| CN202020930784.9U CN212206122U (en) | 2020-05-27 | 2020-05-27 | Object detection circuit and object detection device |
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| CN212206122U true CN212206122U (en) | 2020-12-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324773A (en) * | 2021-04-08 | 2021-08-31 | 嘉鲁达创业投资管理有限公司 | Robot monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324773A (en) * | 2021-04-08 | 2021-08-31 | 嘉鲁达创业投资管理有限公司 | Robot monitoring system |
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