CN212060925U - Microwave sensor and control circuit thereof - Google Patents
Microwave sensor and control circuit thereof Download PDFInfo
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- CN212060925U CN212060925U CN202020925419.9U CN202020925419U CN212060925U CN 212060925 U CN212060925 U CN 212060925U CN 202020925419 U CN202020925419 U CN 202020925419U CN 212060925 U CN212060925 U CN 212060925U
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- 230000003321 amplification Effects 0.000 claims abstract description 54
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 54
- 238000010521 absorption reaction Methods 0.000 claims abstract description 30
- 238000004891 communication Methods 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 abstract description 8
- 239000003990 capacitor Substances 0.000 description 73
- 238000001914 filtration Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 9
- 230000000087 stabilizing effect Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
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Abstract
The utility model discloses a microwave sensor and a control circuit thereof, wherein the control circuit of the microwave sensor comprises a communication unit, a control unit, an antenna unit and a signal amplification unit which are respectively and electrically connected with the control unit; the antenna unit is used for transmitting and receiving antenna signals, the signal amplification unit is used for processing the antenna signals transmitted by the antenna unit and feeding the antenna signals back to the control unit, and the control unit transmits the processed antenna signals to the external controller through the communication unit; the signal amplification unit comprises an absorption part, the absorption part is used for absorbing clutter signals in antenna signals transmitted by the antenna unit, and the absorption part is connected with a signal output end of the antenna unit; the utility model provides a microwave sensor's control circuit absorbs clutter signal among the antenna unit transmitted antenna signal through the absorption portion among the signal amplification unit, reduces the interference signal among the antenna signal, improves microwave sensor's detection precision.
Description
Technical Field
The utility model relates to a sensor technical field, in particular to microwave sensor and control circuit thereof.
Background
The microwave sensor is a device for detecting some physical quantities by utilizing microwave characteristics, and comprises information such as existence, movement speed, distance, angle and the like of an induction object; the transmitting antenna emits microwaves, and when the emitted microwaves encounter an object to be detected, the microwaves are absorbed or reflected, so that the power is changed; the receiving antenna receives the microwave which passes through or is reflected by the object to be measured, converts the microwave into an electric signal, and then the electric signal is processed by the measuring circuit, so that the microwave detection is realized.
In the existing microwave sensor, signals received by a receiving antenna are doped with more clutter signals, and the problem of poor detection precision exists.
It is seen that improvements and enhancements to the prior art are needed.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing disadvantages of the prior art, an object of the present invention is to provide a control circuit for a microwave sensor, which absorbs clutter signals in antenna signals transmitted by an antenna unit through an absorption portion, reduces interference signals in the antenna signals, and improves detection accuracy of the microwave sensor.
In order to achieve the purpose, the utility model adopts the following technical proposal:
a control circuit of a microwave sensor comprises a communication unit, a control unit, an antenna unit and a signal amplification unit, wherein the antenna unit and the signal amplification unit are respectively and electrically connected with the control unit; the antenna unit is used for transmitting and receiving antenna signals, the signal amplification unit is used for processing the antenna signals transmitted by the antenna unit and feeding the antenna signals back to the control unit, and the control unit is used for transmitting the processed antenna signals to the external controller through the communication unit; the signal amplification unit comprises an absorption part, the absorption part is used for absorbing clutter signals in antenna signals transmitted by the antenna unit, and the absorption part is connected with a signal output end of the antenna unit.
The control circuit of the microwave sensor further comprises a power supply unit, and the power supply unit is electrically connected with the control unit, the antenna unit, the signal amplification unit and the communication unit respectively.
In the control circuit of the microwave sensor, the power supply unit comprises a first voltage-stabilizing filtering part and a second voltage-stabilizing filtering part, the first voltage-stabilizing filtering part is electrically connected with the control unit, and the second voltage-stabilizing filtering part is electrically connected with the antenna unit and the signal amplification unit respectively.
In the control circuit of the microwave sensor, the signal amplifying unit further includes a first amplifying part, a second amplifying part, and a third amplifying part; after the antenna signal transmitted by the antenna unit absorbs the clutter signal through the absorption part, the antenna signal is processed by the first amplification part, the second amplification part and the third amplification part in sequence and then is output to the control unit.
In the control circuit of the microwave sensor, the power supply unit further comprises a third voltage-stabilizing filter part, an input end of the third voltage-stabilizing filter part is connected with an output end of the second voltage-stabilizing filter part, and an output end of the third voltage-stabilizing filter part is respectively connected with the first amplification part and the second amplification part.
In the control circuit of the microwave sensor, the control unit comprises a first control part, the first control part is electrically connected with the third amplification part, and the first control part is used for controlling the third amplification part to start or stop working.
In the control circuit of the microwave sensor, the first amplification unit includes a first negative feedback circuit, and the second amplification unit includes a second negative feedback circuit; the first negative feedback circuit is used for reducing the error of the signal output by the first amplifying part, and the second negative feedback circuit is used for reducing the error of the signal output by the second amplifying part.
In the control circuit of the microwave sensor, the control unit further comprises a second control part, the second control part is electrically connected with the antenna unit, and the second control part is used for controlling the antenna unit to start or stop working.
In the control circuit of the microwave sensor, the control unit further comprises a signal output part, and the signal output part is electrically connected with the communication unit.
The utility model discloses still the correspondence provides a microwave sensor, which comprises a housin, be provided with the PCB board in the casing, the printing has foretell microwave sensor's control circuit on the PCB board, still be provided with transmitting antenna dish and receiving antenna dish on the PCB board, transmitting antenna dish and receiving antenna dish respectively with microwave sensor's control circuit electric connection.
Has the advantages that:
the utility model provides a microwave sensor and control circuit thereof, the control circuit of the microwave sensor comprises a signal amplification unit, clutter signals in antenna signals transmitted by an antenna unit are absorbed through an absorption part in the signal amplification unit, interference signals in the antenna signals are reduced, and the detection precision of the microwave sensor is improved; in addition, the first amplification part comprises the first negative feedback circuit, the second amplification part comprises the second negative feedback circuit, errors of the signal output by the first amplification part and the signal output by the second amplification part can be reduced, and the accuracy and the reliability of the detection result are further improved.
Drawings
Fig. 1 is a schematic structural diagram of a control circuit of a microwave sensor provided by the present invention;
fig. 2 is a circuit structure diagram of the control unit provided by the present invention;
fig. 3 is a circuit structure diagram of the power supply unit provided by the present invention;
fig. 4 is a circuit structure diagram of the antenna unit provided by the present invention;
fig. 5 is a circuit structure diagram of the signal amplification unit provided by the present invention;
fig. 6 is a circuit structure diagram of a third voltage stabilizing filter part provided by the present invention;
fig. 7 is a circuit structure diagram of the first control unit according to the present invention;
fig. 8 is a circuit structure diagram of a second control unit according to the present invention;
fig. 9 is a circuit structure diagram of the communication unit according to the present invention.
Detailed Description
The utility model provides a microwave sensor and control circuit thereof, for making the utility model discloses a purpose, technical scheme and effect are clearer, clear and definite, and it is right that the following refers to the drawing and the embodiment is lifted the utility model discloses do further detailed description.
In the description of the present invention, it should be understood that the terms "mounted," "connected," and the like are used in a broad sense, and those skilled in the art can understand the specific meaning of the terms in the present invention according to specific situations.
Referring to fig. 1, the present invention provides a control circuit of a microwave sensor, which includes a communication unit, a control unit, and an antenna unit and a signal amplification unit electrically connected to the control unit respectively; the antenna unit is used for transmitting and receiving antenna signals, the signal amplification unit is used for processing the antenna signals transmitted by the antenna unit and feeding the antenna signals back to the control unit, and the control unit is used for transmitting the processed antenna signals to the external controller through the communication unit; the signal amplification unit comprises an absorption part, the absorption part is used for absorbing clutter signals in antenna signals transmitted by the antenna unit, and the absorption part is connected with a signal output end of the antenna unit.
The external controller is used for receiving the processed antenna signal fed back by the control unit and further controlling the work of a corresponding part, mechanism or device according to the processed antenna signal; for example, the microwave sensor including the control circuit of the microwave sensor is disposed on a refrigerator, and the external controller is a controller disposed in the refrigerator and used for controlling and adjusting the operating state of the refrigerator.
The utility model provides a control circuit of microwave sensor absorbs clutter signal among the antenna unit transmitted antenna signal through the absorption portion among the signal amplification unit, reduces the interfering signal among the antenna signal, improves microwave sensor's detection precision.
In one embodiment, referring to fig. 5, the absorption portion includes a thirteenth capacitor C13, a fourteenth capacitor C14, an eleventh resistor R11 and a twelfth resistor R12; the thirteenth capacitor C13 and the eleventh resistor R11 are connected in series to form a first absorption part, and the fourteenth capacitor C14 and the twelfth resistor R12 are connected in series to form a second absorption part; the input end of the first absorption part and the input end of the second absorption part are respectively connected with the antenna unit; the first absorption part is matched with the second absorption part, clutter signals in antenna signals transmitted by the antenna unit can be effectively absorbed, and the influence of interference signals on detection results is reduced.
In one embodiment, referring to fig. 2, the control unit includes a first control chip U1 and a first capacitor C1; the first control chip U1 is a single chip microcomputer control chip with the model number SC92F7250, one end of the first capacitor C1 is connected with a pin 1 of the first control chip U1, the other end of the first capacitor C1 is connected with a pin 8 of the first control chip U1, and the first capacitor C1 plays a role in filtering.
Further, referring to fig. 1 and fig. 3 to 5, the control circuit of the microwave sensor further includes a power supply unit, and the power supply unit is electrically connected to the control unit, the antenna unit, the signal amplification unit, and the communication unit, respectively.
Further, referring to fig. 3 to 5, the power supply unit includes a first voltage-stabilizing filter portion and a second voltage-stabilizing filter portion, the first voltage-stabilizing filter portion is electrically connected to the control unit, and the second voltage-stabilizing filter portion is electrically connected to the antenna unit and the signal amplification unit, respectively.
In one embodiment, referring to fig. 4, the antenna unit includes a second control chip U2, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a twelfth capacitor C12; the second control chip U2 is a millimeter wave radar chip, and the model of the second control chip U2 may be, but is not limited to, SG24TR 12; one end of the ninth capacitor C9 is respectively connected with the pin 3 and the pin 30 of the second control chip U2, and the other end of the ninth capacitor C9 is grounded; one end of the tenth capacitor C10 is respectively connected with the pin 3 and the pin 30 of the second control chip U2, and the other end of the tenth capacitor C10 is grounded; the ninth capacitor C9 and the tenth capacitor C10 play a role of filtering; one end of a twelfth capacitor C12 of the eleventh capacitor C11 is connected with a pin 9 of a second control chip U2, and the other ends of the eleventh capacitor C11 and the twelfth capacitor C12 are grounded; the eleventh capacitor C11 and the twelfth capacitor C12 play a role in filtering; the pin 18 of the second control chip U2 is an antenna signal receiving port, the pin 28 of the second control chip U2 is an antenna signal transmitting port, the pin 14 of the second control chip U2 is connected to the input terminal of the second absorption part, and the pin 15 of the second control chip U2 is connected to the input terminal of the first absorption part.
Referring to fig. 3, in an embodiment, the first voltage stabilizing filter includes a twentieth capacitor C20 and a third control chip U3, and the model of the third control chip U3 is ME6211C33M 5G-N; one end of the twentieth capacitor C20 is grounded, the other end of the twentieth capacitor C20 is respectively connected with the pin 1 and the pin 3 of the third control chip U3, and the twentieth capacitor C20 plays a role in filtering; the third control chip U3 stabilizes the external input voltage VIN to 3.3V, and outputs the voltage, where the external input voltage VIN may be mains supply; pin 5 of the third control chip U3 is connected with pin 8 of the first control chip U1 of the control unit.
Referring to fig. 3, in an embodiment, the second voltage stabilizing filter portion includes a nineteenth capacitor C19, a fourth control chip U4, a first inductor L1, and a second inductor L2, where the model of the fourth control chip is ME6211C25M 5G-N; one end of the nineteenth capacitor C19 is grounded, the other end of the nineteenth capacitor C19 is connected with the pin 1 and the pin 3 of the fourth control chip U4 respectively, and the nineteenth capacitor C19 plays a role in filtering; the fourth control chip U4 stabilizes the external input voltage VIN to 2.5V for output, where the external input voltage VIN may be mains supply; a pin 5 of the fourth control chip U4 is connected to the signal amplification unit and the antenna unit, respectively; the first inductor L1 is connected in series between the pin 5 of the fourth control chip U4 and the signal amplification unit, and plays a role in filtering; the second inductor L2 is connected in series between the pin 5 of the fourth control chip U4 and the antenna unit, and plays a role of filtering, and the pin 5 of the fourth control chip U4 is connected to the pin 9, the pin 16, and the pin 25 in the second control chip U2 of the antenna unit, respectively.
Further, referring to fig. 4 and 5, the signal amplifying unit further includes a first amplifying part, a second amplifying part, and a third amplifying part; after the antenna signal transmitted by the antenna unit absorbs the clutter signal through the absorption part, the antenna signal is processed by the first amplification part, the second amplification part and the third amplification part in sequence and then is output to the control unit; the first amplifying part plays a role of primary amplification, the second amplifying part plays a role of secondary amplification, and the third amplifying part plays a role of tertiary amplification and outputs the processed signal to the control unit.
In one embodiment, referring to fig. 5, the first amplifying section includes a first operational amplifier UA1, a fourteenth resistor R14, and a sixteenth capacitor C16; the output end of the first absorption part is connected with a pin 2 of a first operational amplifier UA1, the output end of the second absorption part is connected with a pin 3 of a first operational amplifier UA1, a pin 5 of the first operational amplifier UA1 is grounded, a pin 1 of the first operational amplifier UA1 is a signal output end, a pin 1 of the first operational amplifier UA1 is connected with a second amplification part, and a pin 4 of the first operational amplifier UA1 is connected with a second filter voltage stabilizing part of a power supply unit; one end of the fourteenth resistor R14 and one end of the sixteenth capacitor C16 are respectively connected to the pin 3 of the first operational amplifier UA1, the other end of the fourteenth resistor R14 and the other end of the sixteenth capacitor C16 are connected to the power supply unit, the fourteenth resistor R14 plays a role in current limiting, and the sixteenth capacitor C16 plays a role in filtering.
In one embodiment, referring to fig. 5, the second amplifying section includes a second operational amplifier UB1, a seventeenth capacitor C17, and a fifteenth resistor R15; pin 2 of the second operational amplifier UB1 is connected with pin 1 of the first operational amplifier UA1, pin 3 of the second operational amplifier UB1 is connected with the power supply unit, pin 4 of the second operational amplifier UB1 is connected with the second filter voltage stabilizing part of the power supply unit, pin 5 of the second operational amplifier UB1 is grounded, pin 1 of the second operational amplifier UB1 is a signal output end, and pin 1 of the second operational amplifier UB1 is connected with the third amplifying part; the seventeenth capacitor C17 and the fifteenth resistor R15 are connected in series between pin 1 of the first operational amplifier UA1 and pin 2 of the second operational amplifier UB1, and the seventeenth capacitor C17 and the fifteenth resistor R15 couple the signal output by the first operational amplifier UA1 to the second operational amplifier UB 1.
In one embodiment, referring to fig. 5, the third amplifying section includes a third operational amplifier UC1 and a seventeenth resistor R17; pin 2 of the third operational amplifier UC1 is connected to pin 1 of the second operational amplifier UB1, pin 3 of the third operational amplifier UC1 is connected to the power supply unit, pin 4 of the third operational amplifier UC1 is connected to the second filter voltage regulator of the power supply unit, pin 5 of the third operational amplifier UC1 is grounded, pin 1 of the third operational amplifier UC1 is a signal output terminal, and pin 1 of the third operational amplifier UC1 is connected to pin 7 of the first control chip U1 in the control unit; the seventeenth resistor R17 is connected in series between pin 1 of the third operational amplifier UC1 and pin 7 of the first control chip U1, and the seventeenth resistor R17 plays a role of current limiting.
Further, referring to fig. 5 and fig. 6, the power supply unit further includes a third voltage-stabilizing filter unit, an input end of the third voltage-stabilizing filter unit is connected to an output end of the second voltage-stabilizing filter unit, and an output end of the third voltage-stabilizing filter unit is connected to the first amplifying unit and the second amplifying unit, respectively; the third voltage stabilizing and filtering part is used for providing a stable working voltage for the first amplifying part and the second amplifying part.
In an embodiment, referring to fig. 6, the third voltage stabilizing filter includes a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, an eighteenth resistor R18 and a nineteenth resistor R19, the twenty-second capacitor C22, the twenty-third capacitor C23, the twenty-fourth capacitor C24 and the nineteenth resistor R19 are connected in parallel, and the eighteenth capacitor is connected in series between the twenty-third capacitor C23 and the nineteenth resistor R19; the input end of the third voltage-stabilizing filter part is connected with the second voltage-stabilizing filter part, and the output end of the third voltage-stabilizing filter part is respectively connected with pin 3 of the first operational amplifier UA1 and pin 3 of the second operational amplifier UB 1.
Further, referring to fig. 5 and 7, the control unit includes a first control portion, the first control portion is electrically connected to the third amplifying portion, and the first control portion is configured to control the third amplifying portion to start or stop operating.
In one embodiment, referring to fig. 7, the first control portion includes a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10; the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8 and the tenth resistor R10 are connected in parallel, the seventh resistor R7 is connected in series with the fifth capacitor C5, the eighth resistor R8 is connected in series between the fifth capacitor C5 and the sixth capacitor C6, and the ninth resistor R9 is connected in series between the sixth capacitor C6 and the seventh capacitor C7; the input end of the first control part is connected with pin 5 of a first control chip U1, and the output end of the first control part is connected with pin 3 of a third operational amplifier UC 1; the first control chip U1 can change the voltage signal output to the third operational amplifier UC1 by adjusting the duty ratio of the PWM, that is, the first control chip U1 controls the operation of the third amplifying section by adjusting the high-low level signal output by the first control chip U8926.
Further, referring to fig. 5, the first amplifying section includes a first negative feedback circuit, and the second amplifying section includes a second negative feedback circuit; the first negative feedback circuit is used for reducing the error of the signal output by the first amplifying part, and the second negative feedback circuit is used for reducing the error of the signal output by the second amplifying part.
In one embodiment, referring to fig. 5, the first negative feedback circuit includes a fifteenth capacitor C15 and a thirteenth resistor R13 connected in parallel, one end of the thirteenth resistor R13 is connected to pin 2 of the first operational amplifier UA1, and the other end of the thirteenth resistor R13 is connected to pin 1 of the first operational amplifier UA 1; the first negative feedback circuit feeds back the output signal of the first operational amplifier UA1 to the signal input end of the first operational amplifier UA1, so that the closed-loop gain of the first operational amplifier UA1 tends to be stable, the influence of the open-loop gain is eliminated, and the stability of the signal output by the first operational amplifier UA1 is improved.
In one embodiment, referring to fig. 5, the second negative feedback circuit includes an eighteenth capacitor C18 and a sixteenth resistor R16 connected in parallel, one end of the sixteenth resistor R16 is connected to pin 2 of the second operational amplifier UB1, and the other end of the sixteenth resistor R16 is connected to pin 1 of the second operational amplifier UB 1; the second negative feedback circuit feeds back the output signal of the second operational amplifier UB1 to the signal input end of the second operational amplifier UB1, so that the closed-loop gain of the second operational amplifier UB1 tends to be stable, the influence of the open-loop gain is eliminated, and the stability of the signal output by the second operational amplifier UB1 is improved.
Further, referring to fig. 8, the control unit further includes a second control portion, the second control portion is electrically connected to the antenna unit, and the second control portion is configured to adjust an output frequency of the transmitting antenna of the antenna unit.
In an embodiment, referring to fig. 8, the second control portion is a 3-step RC low pass filter circuit, and the second control portion includes a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are connected in parallel, the fourth resistor R4 is connected in series between the second capacitor C2 and the third capacitor C3, the fifth resistor R5 is connected in series between the third capacitor C3 and the fourth capacitor C4, and the sixth resistor R6 is connected in series with the fourth capacitor C4; the input end of the second control part is connected with a pin 4 of the first control chip U1, and the output end of the second control part is connected with a pin 23 of a second control chip U2 of the antenna unit; the first control chip U1 can change the voltage signal output to the second control chip U2 by adjusting the duty ratio of the PWM, so that the voltage signal at the pin 23 of the second control chip U2 is stabilized at 2.47V, and the output frequency of the antenna signal transmitting port (transmitting antenna) of the antenna unit is stabilized, thereby ensuring that the frequency of the reflected antenna signal, i.e., the frequency of the reflected signal received by the antenna signal receiving port of the antenna unit, is maintained in a stable range.
Further, referring to fig. 2 and 9, the control unit further includes a signal output portion, and the signal output portion is electrically connected to the communication unit.
In one embodiment, referring to fig. 2, the signal output portion includes a first resistor R1, a second resistor R2, a third resistor R3, and a first transistor Q1; one end of the first resistor R1 is connected with a pin 6 of a first control chip U1, and the other end of the first resistor R1 is connected with the base electrode of a first triode Q1; one end of the second resistor R2 is connected with the base electrode of the first triode Q1, and the other end of the second resistor R2 is grounded; the emitter of the first triode Q1 is grounded, the emitter of the first triode Q1 is connected to the communication unit and one end of the third resistor R3, respectively, the other end of the third resistor R3 is connected to an external input voltage VIN, which may be mains supply.
In one embodiment, referring to fig. 9, the communication unit includes a communication port P1, a twentieth resistor R20 and a twenty-first resistor R21; a pin 1 of the communication port P1 is connected with an external input voltage VIN, a pin 2 of the communication port P1 is grounded, a pin 3 of the communication port P1 is connected with a pin 3 of a first control chip U1 in the control unit, a pin 4 of the communication port P1 is connected with a collector of a first triode Q1, and a pin 5 of the communication port P1 is connected with a pin 2 of a first control chip U1 in the control unit; the twentieth resistor R20 is connected in series with a pin 3 of the communication port P1, the twenty-first resistor R21 is connected in series with a pin 5 of the communication port P1, and the twentieth resistor R20 and the twenty-first resistor R21 play a role in limiting current; pin 3 of the communication port P1 is a serial port data transmitting terminal, and pin 5 of the communication port P1 is a serial port data receiving terminal.
The communication unit is connected with an external controller, the control unit transmits the processed antenna signal to the external controller through the communication unit, and the external controller controls and adjusts the working state of the corresponding device according to the received signal; for example, the microwave sensor is arranged on the refrigerator, when the microwave sensor detects that a person approaches, the antenna signal sent by the antenna unit is shielded, and the antenna signal received by the antenna unit changes; the antenna unit processes the received antenna signal through the signal amplification unit and outputs the antenna signal to the control unit, the control unit outputs the antenna signal to the external controller through the communication unit, and the external controller controls the brightness of a display screen on the refrigerator to be improved, so that a user can conveniently check the internal environment condition of the refrigerator and conveniently control and adjust the working state of the refrigerator through the display screen.
The utility model also correspondingly provides a microwave sensor, which comprises a shell, wherein a PCB is arranged in the shell, a control circuit of the microwave sensor is printed on the PCB, a transmitting antenna disc and a receiving antenna disc are also arranged on the PCB, and the transmitting antenna disc and the receiving antenna disc are respectively electrically connected with the control circuit of the microwave sensor; specifically, the transmitting antenna disk is connected with the pin 28 of the second control chip U2 in the antenna unit, and the transmitting antenna disk transmits the antenna signal; the receiving antenna disk is connected to pin 18 of a second control chip U2 in the antenna unit, the receiving antenna disk being used for receiving antenna signals.
It is understood that equivalent substitutions or changes can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such changes or substitutions shall fall within the scope of the present invention.
Claims (10)
1. A control circuit of a microwave sensor comprises a communication unit, and is characterized by also comprising a control unit, and an antenna unit and a signal amplification unit which are respectively and electrically connected with the control unit; the antenna unit is used for transmitting and receiving antenna signals, the signal amplification unit is used for processing the antenna signals transmitted by the antenna unit and feeding the antenna signals back to the control unit, and the control unit is used for transmitting the processed antenna signals to the external controller through the communication unit; the signal amplification unit comprises an absorption part, the absorption part is used for absorbing clutter signals in antenna signals transmitted by the antenna unit, and the absorption part is connected with a signal output end of the antenna unit.
2. The control circuit of claim 1, further comprising a power supply unit, wherein the power supply unit is electrically connected to the control unit, the antenna unit, the signal amplification unit and the communication unit.
3. The control circuit of claim 2, wherein the power supply unit comprises a first voltage-stabilizing filter portion and a second voltage-stabilizing filter portion, the first voltage-stabilizing filter portion is electrically connected to the control unit, and the second voltage-stabilizing filter portion is electrically connected to the antenna unit and the signal amplification unit, respectively.
4. The control circuit of a microwave sensor according to claim 2, wherein the signal amplifying unit further comprises a first amplifying section, a second amplifying section, and a third amplifying section; after the antenna signal transmitted by the antenna unit absorbs the clutter signal through the absorption part, the antenna signal is processed by the first amplification part, the second amplification part and the third amplification part in sequence and then is output to the control unit.
5. The control circuit of claim 4, wherein the power supply unit further comprises a third voltage-stabilizing filter unit, an input terminal of the third voltage-stabilizing filter unit is connected to an output terminal of the second voltage-stabilizing filter unit, and output terminals of the third voltage-stabilizing filter unit are respectively connected to the first amplification unit and the second amplification unit.
6. The control circuit of claim 4, wherein the control unit comprises a first control unit, the first control unit is electrically connected to the third amplification unit, and the first control unit is configured to control the third amplification unit to start or stop operating.
7. The control circuit of claim 4, wherein the first amplifying section comprises a first negative feedback circuit, and the second amplifying section comprises a second negative feedback circuit; the first negative feedback circuit is used for reducing the error of the signal output by the first amplifying part, and the second negative feedback circuit is used for reducing the error of the signal output by the second amplifying part.
8. The control circuit of claim 1, wherein the control unit further comprises a second control unit, the second control unit is electrically connected to the antenna unit, and the second control unit is configured to control the antenna unit to start or stop operating.
9. The control circuit of claim 1, wherein the control unit further comprises a signal output part, and the signal output part is electrically connected to the communication unit.
10. A microwave sensor, comprising a housing, wherein a PCB board is disposed in the housing, the PCB board is printed with a control circuit of the microwave sensor as claimed in any one of claims 1 to 9, the PCB board is further provided with a transmitting antenna disc and a receiving antenna disc, and the transmitting antenna disc and the receiving antenna disc are electrically connected to the control circuit of the microwave sensor, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020925419.9U CN212060925U (en) | 2020-05-27 | 2020-05-27 | Microwave sensor and control circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020925419.9U CN212060925U (en) | 2020-05-27 | 2020-05-27 | Microwave sensor and control circuit thereof |
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| CN212060925U true CN212060925U (en) | 2020-12-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111596588A (en) * | 2020-05-27 | 2020-08-28 | 达仁智能科技(佛山)有限公司 | Microwave sensor and control circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111596588A (en) * | 2020-05-27 | 2020-08-28 | 达仁智能科技(佛山)有限公司 | Microwave sensor and control circuit thereof |
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