CN214471434U - Anti-interference circuit and device based on pressure sensor and pressure sensor - Google Patents
Anti-interference circuit and device based on pressure sensor and pressure sensor Download PDFInfo
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- CN214471434U CN214471434U CN202120592621.9U CN202120592621U CN214471434U CN 214471434 U CN214471434 U CN 214471434U CN 202120592621 U CN202120592621 U CN 202120592621U CN 214471434 U CN214471434 U CN 214471434U
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Abstract
The utility model discloses an anti jamming circuit, device and pressure sensor based on pressure sensor relates to sensor technical field. The anti-interference circuit based on the pressure sensor comprises a voltage stabilizing circuit, a pressure-sensitive bridge, a conditioning circuit and an isolation buffer circuit, wherein the voltage stabilizing circuit generates a working voltage for stable output according to a power supply voltage, the conditioning circuit performs zero setting on the pressure-sensitive bridge according to the working voltage, the pressure-sensitive bridge performs pressure detection according to the working voltage and generates a voltage to be processed, the conditioning circuit generates a conditioning voltage according to the voltage to be processed, the isolation buffer circuit generates a detection voltage for stable output according to the working voltage and the conditioning voltage, the pressure value is displayed by the display module, the voltage stabilizing circuit provides stable working voltage, the conditioning circuit is zeroed before pressure measurement, the conditioning voltage is generated according to the voltage to be processed, the isolation buffer circuit generates stable output detection voltage according to the working voltage and the conditioning voltage, unstable signal interference of input and output voltage is avoided, and pressure measurement precision is improved.
Description
Technical Field
The utility model relates to a sensor technical field especially relates to an anti jamming circuit, device and pressure sensor based on pressure sensor.
Background
With the vigorous development of the measurement technology, the pressure sensor is widely applied to various fields, and the realization of accurate measurement by the pressure sensor is particularly important in the industrial control or detection link. However, there is inevitably some signal interference when the pressure sensor is making measurements. The pressure sensor generally has a specific working voltage, when the input voltage provided by the power supply is different from the working voltage, the output of the pressure sensor is unstable, and after the pressure sensor outputs the measurement voltage, if the input voltage does not conform to the input voltage of subsequent equipment, the problem of larger error of the output signal is also caused.
The above is only for the purpose of assisting understanding of the technical solutions of the present invention, and does not represent an admission that the above is the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides an anti jamming circuit, device and pressure sensor based on pressure sensor aims at solving among the prior art pressure sensor's input/output voltage and has signal interference's technical problem.
In order to achieve the above object, the utility model provides an anti jamming circuit based on pressure sensor, anti jamming circuit based on pressure sensor includes: the voltage stabilizing circuit, the voltage-sensitive bridge, the conditioning circuit and the isolation buffer circuit are sequentially connected, wherein the working voltage output end of the voltage stabilizing circuit is also respectively connected with the working voltage input end of the conditioning circuit and the working voltage input end of the isolation buffer circuit;
the voltage stabilizing circuit is used for receiving a power supply voltage, generating a stably-output working voltage according to the power supply voltage, and respectively outputting the working voltage to the conditioning circuit, the voltage-sensitive bridge and the isolation buffer circuit;
the conditioning circuit is used for receiving the working voltage and zeroing the voltage-sensitive bridge according to the working voltage;
the voltage-sensitive bridge is used for receiving the working voltage, detecting the pressure according to the working voltage, generating a voltage to be processed and outputting the voltage to be processed to the conditioning circuit;
the conditioning circuit is further used for receiving the voltage to be processed, generating a conditioning voltage according to the voltage to be processed, and outputting the conditioning voltage to the isolation buffer circuit;
the isolation buffer circuit is used for receiving the working voltage and the conditioning voltage, generating a detection voltage which is stably output according to the working voltage and the conditioning voltage, and outputting the detection voltage to a display module so that the display module displays a pressure value according to the detection voltage.
Optionally, the reference voltage source chip, the first resistor and the first capacitor;
the first end of the first resistor is connected with the voltage output end of the power supply, the second end of the first resistor is respectively connected with the first end of the first capacitor and the reference electrode of the reference voltage source chip, the anode of the reference voltage source chip is grounded, and the second end of the first capacitor is grounded.
Optionally, the voltage stabilizing circuit further includes a first amplifier, a second resistor, and a third resistor;
the cathode of the reference voltage source chip is connected with the non-inverting input end of the first amplifier, the inverting input end of the first amplifier is respectively connected with the first end of the second resistor and the first end of the third resistor, the output end of the first amplifier is respectively connected with the second end of the second resistor and the first end of the voltage-sensitive bridge, and the second end of the third resistor is grounded.
Optionally, the conditioning circuit includes a signal conditioning chip, a fourth resistor, and a second capacitor;
the first end of the signal conditioning chip is connected with the second end of the voltage-sensitive bridge, the second end and the seventh end of the signal conditioning chip are respectively connected with an analog ground, the third end of the signal conditioning chip is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the analog ground, the fourth end of the signal conditioning chip is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the analog ground, the fifth end of the signal conditioning chip is connected with the conditioning voltage input end of the isolation buffer circuit, the sixth end of the signal conditioning chip is connected with the working voltage output end of the voltage stabilizing circuit, and the eighth end of the signal conditioning chip is connected with the third end of the voltage-sensitive bridge.
Optionally, the conditioning circuit further comprises a zeroing resistor;
the first end of the zero setting resistor is connected with the working voltage output end of the voltage stabilizing circuit, and the second end of the zero setting resistor is connected with the eighth end of the signal conditioning chip.
Optionally, the isolation buffer circuit comprises a photocoupler and a first diode;
the anode of the photoelectric coupler is connected with the conditioning voltage output end of the conditioning circuit, the cathode of the photoelectric coupler is grounded, the anode of the first diode is connected with the working voltage output end of the voltage stabilizing circuit, and the cathode of the first diode is connected with the collector of the photoelectric coupler.
Optionally, the isolation buffer circuit further includes a first triode, a second triode, a fifth resistor, and a sixth resistor;
the emitting electrode of the photoelectric coupler is respectively connected with the emitting electrode of the first triode and the first end of the fifth resistor, the base electrode of the first triode is respectively connected with the second end of the fifth resistor and the emitting electrode of the second triode, the base electrode of the second triode is respectively connected with the collector electrode of the first triode and the first end of the sixth resistor, the collector electrode of the second triode is connected with the display module, and the second end of the sixth resistor is grounded.
Optionally, the pressure sensor-based anti-jamming circuit further includes a filter circuit, and the filter circuit includes a second amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor, and a fourth capacitor;
the detection voltage output end of the isolation buffer circuit is connected with a first end of a seventh resistor, a second end of the seventh resistor is respectively connected with a first end of an eighth resistor and a first end of a third capacitor, a second end of the seventh resistor is also connected with a first end of a fourth capacitor, a second end of the fourth capacitor is grounded, a second end of the third capacitor is respectively connected with a non-inverting input end of a second amplifier and a first end of a ninth resistor, a non-inverting input end of the second amplifier is respectively connected with a first end of a tenth resistor and a first end of an eleventh resistor, a second end of the ninth resistor and a second end of the tenth resistor are respectively grounded, and an output end of the second amplifier is respectively connected with a second end of the eighth resistor and a second end of the eleventh resistor.
Furthermore, in order to achieve the above object, the utility model also provides an anti jamming unit based on pressure sensor, anti jamming unit based on pressure sensor contains as above anti jamming circuit based on pressure sensor.
Furthermore, in order to achieve the above object, the present invention also provides a pressure sensor, which comprises the interference preventing device based on the pressure sensor as described above.
The utility model provides an anti jamming circuit based on pressure sensor, anti jamming circuit based on pressure sensor is including the voltage stabilizing circuit, pressure sensitive bridge, modulate circuit and the isolation buffer circuit that connect gradually, and wherein, voltage stabilizing circuit's operating voltage output still is connected with modulate circuit's operating voltage input and isolation buffer circuit's operating voltage input respectively. The utility model discloses a voltage stabilizing circuit receives mains voltage, generate the operating voltage of stable output according to mains voltage, export operating voltage to the conditioning circuit respectively, voltage-sensitive bridge and isolation buffer circuit, conditioning circuit receives operating voltage, zero set voltage according to operating voltage to voltage-sensitive bridge, voltage-sensitive bridge receives operating voltage, carry out pressure detection according to operating voltage, and generate pending voltage, export pending voltage to conditioning circuit, conditioning circuit receives pending voltage, generate conditioning voltage according to pending voltage, export conditioning voltage to isolation buffer circuit, isolation buffer circuit receives operating voltage and conditioning voltage, generate the detection voltage of stable output according to operating voltage and conditioning voltage, export detection voltage to display module, so that display module shows the pressure value according to detection voltage, voltage-stabilizing circuit is to conditioning circuit, the voltage is higher than the voltage of voltage-stabilizing circuit, the voltage-stabilizing circuit is higher than the voltage of voltage-stabilizing circuit, the voltage is higher than the voltage of voltage-stabilizing circuit, output voltage is higher than the voltage-stabilizing circuit, the voltage of waiting to be processed voltage, receive voltage-stabilizing circuit and keep apart buffer circuit, output voltage, to be served as a voltage-treating circuit, to be served as a voltage output, pending voltage output, to be served as a voltage, pending voltage is served as a voltage-to be served as a voltage-based on the detection voltage, the detection voltage-based on the detection voltage of the detection voltage-output, the detection voltage of waiting circuit, the detection voltage of waiting for the detection voltage-based on the detection voltage of waiting for the detection voltage, the detection voltage-based on the detection voltage, the detection of waiting for the detection of waiting circuit, the detection of waiting for the detection of, The voltage-sensitive bridge and the isolation buffer circuit provide stable working voltage, the conditioning circuit performs zero setting before the voltage measurement of the voltage-sensitive bridge, the conditioning circuit generates conditioning voltage according to the voltage to be processed output by the voltage-sensitive bridge, and the isolation buffer circuit generates detection voltage with stable output according to the working voltage and the conditioning voltage, so that signal interference caused by unstable input and output voltage of the pressure sensor is avoided, and the measurement precision of the sensor is improved.
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 schematic structural diagram of a first embodiment of an anti-interference circuit based on a pressure sensor according to the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the anti-interference circuit based on the pressure sensor of the present invention;
fig. 3 is a schematic circuit diagram of an embodiment of the anti-jamming circuit based on the pressure sensor of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Voltage stabilizing circuit | C1～C4 | First to |
| 200 | Pressure-sensitive bridge | R1～R11 | First to |
| 300 | Conditioning circuit | A1～A2 | First to |
| 400 | Isolation buffer circuit | Q1～Q2 | First to |
| 500 | Filter circuit | T1 | Signal conditioning chip |
| VIn | Voltage input terminal | L1 | Reference voltage source chip |
| VOut | Voltage output terminal | E1 | Photoelectric coupler |
| RP | Zero setting resistor | D1 | First diode |
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
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 all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention 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 indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly 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, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the present invention.
It should be noted that, in the practical application of the present invention, the software program is inevitably applied to the software program, but the applicant states here that the software program applied in the embodiment of the present invention is the prior art, and in the present application, the modification and protection of the software program are not involved, but only the protection of the hardware architecture designed for the purpose of the invention.
The utility model provides an anti jamming circuit based on pressure sensor, refer to fig. 1, fig. 1 is the utility model discloses the structural schematic of the first embodiment of anti jamming circuit based on pressure sensor.
The anti-interference circuit based on the pressure sensor comprises a voltage stabilizing circuit 100, a voltage-sensitive bridge 200, a conditioning circuit 300 and an isolation buffer circuit 400 which are sequentially connected, wherein the working voltage output end of the voltage stabilizing circuit 100 is also respectively connected with the working voltage input end of the conditioning circuit 300 and the working voltage input end of the isolation buffer circuit 400.
The voltage stabilizing circuit 100 is configured to receive a power voltage, generate a stable output working voltage according to the power voltage, and output the working voltage to the conditioning circuit 300, the voltage-sensitive bridge 200, and the isolation buffer circuit 400.
It should be noted that the working voltage of the measurement system is susceptible to the influence of factors such as environment and power supply ripple, and especially in the process of detection of the measurement element, the surge generated by the overlarge input voltage is likely to cause circuit damage, the too small input voltage is not enough to provide a normal working voltage, and the input voltage fluctuation is likely to cause nonlinear fluctuation of the detected value, so that subsequent conditioning is difficult to compensate.
It is easy to understand that, the voltage stabilizing circuit 100 receives the power voltage output by the power supply, may perform voltage stabilizing adjustment on the power voltage to generate a regulated voltage output stably, and amplifies the regulated voltage to obtain a working voltage for safe operation of the subsequent device, where the regulated voltage may be lower than the working voltage of the subsequent device, and within the subsequent amplification range, so that the power voltage is converted into the working voltage output stably after being regulated and amplified, which is not limited in this embodiment.
It can be understood that, when the input voltage of the reference voltage source is similar to the output voltage, the precision of the output voltage will be reduced, and the voltage stabilizing circuit 100 first performs voltage stabilizing adjustment on the power voltage, so as to avoid that when the voltage difference between the power voltage and the output voltage is small, the voltage difference can be adjusted and amplified through voltage stabilizing, and then the ratio amplification is performed, so as to ensure the working voltage with higher precision, which is not limited in this embodiment.
The conditioning circuit 300 is configured to receive the working voltage, and zero the voltage-sensitive bridge 200 according to the working voltage.
It is easy to understand that pressure sensor needs to be conditioned before pressure detection to avoid initial error to cause the pressure measurement result error too big after enlargeing, conditioning circuit 300 sets zero through the zero setting resistance RP that sets up, through changing the resistance of zero setting resistance RP, when making pressure sensor not have the detected pressure, the pressure numerical value that shows is zero, thereby avoids pressure sensor's zero-bit interference.
The voltage-sensitive bridge 200 is configured to receive the working voltage, perform pressure detection according to the working voltage, generate a voltage to be processed, and output the voltage to be processed to the conditioning circuit 300.
It should be noted that the piezo-bridge 200 may be composed of four piezo-resistors with the same resistance, and in a specific implementation, the piezo-bridge 200 may be a wheatstone bridge applied to a pressure sensor. When pressure detection is not performed, the voltage-sensitive bridge 200 is in a balanced state, and when pressure is applied, the resistance value of the voltage-sensitive resistor changes, so that a voltage to be processed is generated, and at the moment, the voltage to be processed is smaller, and the voltage to be processed needs to be processed through the conditioning circuit 300, so that a detection voltage which can be identified by subsequent equipment is obtained.
The conditioning circuit 300 is further configured to receive the voltage to be processed, generate a conditioning voltage according to the voltage to be processed, and output the conditioning voltage to the isolation buffer circuit 400.
It should be understood that the conditioning circuit 300 may amplify the voltage to be processed, and compensate the gain error and the temperature drift of the pressure sensor by using the compensation resistor, so as to condition the weak voltage output by the pressure sensor, thereby avoiding the signal interference of the output voltage of the pressure sensor, and improving the accuracy of the detection.
The isolation buffer circuit 400 is configured to receive the working voltage and the conditioning voltage, generate a detection voltage for stable output according to the working voltage and the conditioning voltage, and output the detection voltage to a display module, so that the display module displays a pressure value according to the detection voltage.
It is easy to understand that when the voltage-sensitive bridge 200 is under a large pressure, a large conditioning voltage can be generated by conditioning the conditioning circuit 300, and if the conditioning voltage is directly output to a subsequent device, the subsequent device is easily damaged by a large voltage impact, and the isolation buffer circuit 400 isolates the detection part of the pressure sensor from other parts (such as a single chip, a display module, an interface module, and the like) of the electrical appliance by using the photoelectric effect, so that signal interference of the detection part is reduced, and a safe and stable detection voltage is generated.
In this embodiment, the anti-interference circuit based on the pressure sensor includes a voltage stabilizing circuit 100, a voltage sensitive bridge 200, a conditioning circuit 300, and an isolation buffer circuit 400, which are connected in sequence, wherein a working voltage output terminal of the voltage stabilizing circuit 100 is further connected to a working voltage input terminal of the conditioning circuit 300 and a working voltage input terminal of the isolation buffer circuit 400, respectively. The utility model receives the power voltage by the voltage stabilizing circuit 100, generates the stable output working voltage according to the power voltage, outputs the working voltage to the conditioning circuit 300, the voltage-sensitive bridge 200 and the isolation buffer circuit 400 respectively, the conditioning circuit 300 receives the working voltage, the voltage-sensitive bridge 200 is zeroed according to the working voltage, the voltage-sensitive bridge 200 receives the working voltage, detects the pressure according to the working voltage, generates the voltage to be processed, outputs the voltage to be processed to the conditioning circuit 300, the conditioning circuit 300 receives the voltage to be processed, generates the conditioning voltage according to the voltage to be processed, outputs the conditioning voltage to the isolation buffer circuit 400, the isolation buffer circuit 400 receives the working voltage and the conditioning voltage, generates the stable output detection voltage according to the working voltage and the conditioning voltage, outputs the detection voltage to the display module, so that the display module displays the pressure value according to the detection voltage, the voltage stabilizing circuit 100 provides stable working voltage for the conditioning circuit 300, the voltage-sensitive bridge 200 and the isolation buffer circuit 400, the conditioning circuit 300 performs zero adjustment before the voltage measurement of the voltage-sensitive bridge 200, the conditioning circuit 300 generates conditioning voltage according to the voltage to be processed output by the voltage-sensitive bridge 200, and the isolation buffer circuit 400 generates detection voltage with stable output according to the working voltage and the conditioning voltage, so that signal interference caused by unstable input and output voltage of the pressure sensor is avoided, and the measurement accuracy of the sensor is improved.
Based on the first embodiment of the present invention, a second embodiment of the anti-interference circuit based on the pressure sensor of the present invention is proposed, referring to fig. 2, fig. 2 is a schematic structural diagram of the second embodiment of the anti-interference circuit based on the pressure sensor of the present invention; referring to fig. 3, fig. 3 is a circuit diagram of a second embodiment of the present invention.
In the second embodiment, the voltage regulator circuit 100 includes a reference voltage source chip L1, a first resistor R1, and a first capacitor C1.
A first end of the first resistor R1 is connected to a voltage output end of a power supply, a second end of the first resistor R1 is connected to a first end of the first capacitor C1 and a reference electrode of the reference voltage source chip L1, an anode of the reference voltage source chip L1 is grounded, and a second end of the first capacitor C1 is grounded.
It should be understood that the reference voltage source chip L1 has the advantages of noise reduction, high stability, etc., and the reference voltage source chip L1 receives the power voltage outputted by the power supply, and can regulate the power voltage in a voltage-stabilizing manner to generate a regulated voltage with stable output. As shown in fig. 3, the first end of the first resistor R1 may be a voltage input terminal VIn of the anti-jamming circuit based on the pressure sensor, and the first resistor R1 may divide the power voltage and output the divided voltage to the reference voltage source chip L1, so as to protect the reference voltage source chip L1 and prevent the reference voltage source chip L1 from being damaged by large voltage impact when the power output pressure is too high.
In this embodiment, the voltage regulator circuit 100 further includes a first amplifier a1, a second resistor R2, and a third resistor R3;
the cathode of the reference voltage source chip L1 is connected to the non-inverting input terminal of the first amplifier a1, the inverting input terminal of the first amplifier a1 is connected to the first terminal of the second resistor R2 and the first terminal of the third resistor R3, the output terminal of the first amplifier a1 is connected to the second terminal of the second resistor R2 and the first terminal of the voltage-sensitive bridge 200, and the second terminal of the third resistor R3 is grounded.
It should be noted that the first amplifier a1, the second resistor R2, and the third resistor R3 may constitute an amplifying circuit, and the non-inverting input terminal of the first amplifier a1 receives the voltage stably output by the reference voltage source chip L1, and amplifies the voltage, so that when the voltage difference between the power voltage and the input voltage of the voltage-sensitive bridge 200 is small, the voltage difference may be amplified by the reference voltage source chip L1, and then the amplifying circuit constituted by the first amplifier a1, the second resistor R2, and the third resistor R3 performs proportional amplification, so as to ensure a high-precision working voltage, which is not limited in this embodiment.
In the embodiment, the conditioning circuit 300 includes a signal conditioning chip T1, a fourth resistor R4, and a second capacitor C2;
the first end of the signal conditioning chip T1 is connected to the second end of the voltage-sensitive bridge 200, the second end and the seventh end of the signal conditioning chip T1 are respectively connected to an analog ground, the third end of the signal conditioning chip T1 is connected to the first end of the second capacitor C2, the second end of the second capacitor C2 is connected to an analog ground, the fourth end of the signal conditioning chip T1 is connected to the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to an analog ground, the fifth end of the signal conditioning chip T1 is connected to a conditioning voltage input end of the isolation buffer circuit 400, the sixth end of the signal conditioning chip T1 is connected to the working voltage output end of the voltage regulator circuit 100, and the eighth end of the signal conditioning chip T1 is connected to the third end of the voltage-sensitive bridge 200.
It should be noted that the signal conditioning chip T1 may amplify the voltage to be processed, the fourth resistor R4 may be a compensation resistor of the conditioning circuit 300, the signal conditioning chip T1 compensates the gain error and the temperature drift of the pressure sensor by using the compensation resistor, the second capacitor C2 may be a filter capacitor of the conditioning circuit 300, and the second capacitor C2 may reduce the influence of the radio frequency interference in the voltage signal to the minimum to condition the weak voltage output by the pressure sensor, so as to avoid the signal interference of the output voltage of the pressure sensor and improve the accuracy of the detection, which is not limited in this embodiment.
In this embodiment, the conditioning circuit 300 further includes a zero adjusting resistor RP, a first end of the zero adjusting resistor RP is connected to the working voltage output end of the voltage regulator circuit 100, and a second end of the zero adjusting resistor RP is connected to the eighth end of the signal conditioning chip T1.
It can be understood that the pressure sensor needs to be conditioned before pressure detection, so as to avoid overlarge error of a pressure measurement result caused by the fact that an initial error is amplified, the resistance value of the zero setting resistor RP can be changed by the zero setting resistor RP, when the pressure sensor does not detect pressure, the displayed pressure value is zero, subsequent measurement can be carried out after the resistance value of the zero setting resistor RP is determined, so that zero interference of the pressure sensor is avoided, and the embodiment does not limit the zero interference.
In the present embodiment, the isolation buffer circuit 400 includes a photo-coupler E1 and a first diode D1;
the anode of the photoelectric coupler E1 is connected with the conditioning voltage output end of the conditioning circuit 300, the cathode of the photoelectric coupler E1 is grounded, the anode of the first diode D1 is connected with the working voltage output end of the voltage stabilizing circuit 100, and the cathode of the first diode D1 is connected with the collector of the photoelectric coupler E1.
It should be understood that when the voltage-sensitive bridge 200 is subjected to a large pressure, a large conditioning voltage can be generated by conditioning by the conditioning circuit 300, and if the conditioning voltage is directly output to a subsequent device, the subsequent device is easily damaged by a large voltage impact, and the photoelectric coupler E1 isolates the detection portion of the pressure sensor from other portions (such as a single chip, a display module, an interface module, and the like) of the electrical appliance by using the photoelectric effect, so as to reduce signal interference of the detection portion and generate a safe and stable detection voltage, which is not limited in this embodiment.
It is easy to understand that the cathode of the first diode D1 is connected to the collector of the triode in the photocoupler E1, and the first diode D1 has the functions of unidirectional conductivity and voltage regulation and rectification, so that the operating voltage of the voltage regulator circuit 100 can be stably output to the photocoupler E1, and the voltage interference signal generated by the photocoupler E1 can be prevented from being fed back to the voltage-sensitive bridge 200 and the conditioning circuit 300, which is not limited in this embodiment.
In this embodiment, the isolation buffer circuit 400 further includes a first transistor Q1, a second transistor Q2, a fifth resistor R5, and a sixth resistor R6;
an emitter of the photocoupler E1 is connected to an emitter of the first triode Q1 and a first end of the fifth resistor R5, a base of the first triode Q1 is connected to a second end of the fifth resistor R5 and an emitter of the second triode Q2, a base of the second triode Q2 is connected to a collector of the first triode Q1 and a first end of the sixth resistor R6, a collector of the second triode Q2 is connected to the display module, and a second end of the sixth resistor R6 is grounded.
It should be noted that, a circuit formed by the first triode Q1 and the second triode Q2 may have a buffering function, when the photocoupler E1 outputs a voltage to the emitter of the first triode Q1, the base voltage of the first triode Q1 is smaller than the emitter voltage of the first triode Q1, the first triode Q1 is turned on, and the emitter voltage of the second triode Q2 is larger than the base voltage of the second triode Q2, and the second triode Q2 is turned on, so as to stabilize the output detection voltage, which is not limited in this embodiment.
It is understood that the fifth resistor R5 may be a bias resistor of the first transistor Q1 and may provide a bias voltage to the emitter of the first transistor Q1, and the sixth resistor R6 may be a bias resistor of the second transistor Q2 and may provide a bias voltage to the emitter of the second transistor Q2, which is not limited in this embodiment.
In this embodiment, the pressure sensor-based anti-jamming circuit further includes a filter circuit 500, where the filter circuit 500 includes a second amplifier a2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third capacitor C3, and a fourth capacitor C4;
the detection voltage output terminal of the isolation buffer circuit 400 is connected to a first terminal of a seventh resistor R7, a second end of the seventh resistor R7 is connected to a first end of the eighth resistor R8 and a first end of the third capacitor C3, the second end of the seventh resistor R7 is also connected to the first end of the fourth capacitor C4, the second end of the fourth capacitor C4 is connected to ground, a second end of the third capacitor C3 is connected to a non-inverting input terminal of the second amplifier a2 and a first end of the ninth resistor R9, the non-inverting input terminal of the second amplifier a2 is connected to the first terminal of the tenth resistor R10 and the first terminal of the eleventh resistor R11, a second terminal of the ninth resistor R9 and a second terminal of the tenth resistor R10 are respectively connected to ground, the output end of the second amplifier a2 is connected to the second end of the eighth resistor R8 and the second end of the eleventh resistor R11, respectively.
It is easy to understand that the second amplifier a2, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the third capacitor C3, and the fourth capacitor C4 may form a second-order band-pass filter, and may further filter and amplify the detection voltage output by the isolation buffer circuit 400, so as to obtain a detection voltage with higher measurement accuracy, as shown in fig. 3, the output terminal of the second amplifier a2 may also be the voltage output terminal VOut of the anti-jamming circuit based on the pressure sensor, which is not limited in this embodiment.
Through the above circuit of the present invention, the voltage stabilizing circuit 100 includes a reference voltage source chip L1, a first resistor R1, a first capacitor C1, a first amplifier a1, a second resistor R2 and a third resistor R3, the conditioning circuit 300 includes a signal conditioning chip T1, a fourth resistor R4, a second capacitor C2 and a zeroing resistor RP, the isolation buffer circuit 400 includes a photocoupler E1, a first diode D1, a first triode Q1, a second triode Q2, a fifth resistor R5 and a sixth resistor R6, the anti-interference circuit based on the pressure sensor further includes a filter circuit 500, the filter circuit 500 includes a second amplifier a2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a third capacitor C3 and a fourth capacitor C4, the zeroing resistor RP is generated by the voltage source chip L1 and the first reference amplifier a1, and the zeroing resistor RP is measured before the stable operation, the signal conditioning chip T1 conditions and amplifies the voltage to be processed, the photoelectric coupler E1 isolates signal interference, and the first triode Q1 and the second triode Q2 enable the voltage to be stably output, so that signal interference caused by unstable input and output voltages of the pressure sensor is avoided, and the measurement precision and the detection accuracy of the sensor are improved.
Furthermore, in order to achieve the above object, the utility model discloses still provide an anti jamming unit based on pressure sensor, anti jamming unit based on pressure sensor contains as above anti jamming circuit based on pressure sensor.
Since the anti-interference device based on the pressure sensor adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
Furthermore, in order to achieve the above object, the present invention further provides a pressure sensor, wherein the pressure sensor comprises the interference rejection unit based on the pressure sensor as described above.
Since the pressure sensor adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in the specific application, those skilled in the art can set the solution as required, and the present invention is not limited thereto.
It should be noted that the above-described work flow is only illustrative, and does not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to practical needs, and the present invention is not limited herein.
In addition, the technical details that are not elaborated in this embodiment can be referred to the anti-interference circuit based on the pressure sensor provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. The anti-interference circuit based on the pressure sensor is characterized by comprising a voltage stabilizing circuit, a pressure-sensitive bridge, a conditioning circuit and an isolation buffer circuit which are sequentially connected, wherein the working voltage output end of the voltage stabilizing circuit is also respectively connected with the working voltage input end of the conditioning circuit and the working voltage input end of the isolation buffer circuit;
the voltage stabilizing circuit is used for receiving a power supply voltage, generating a stably-output working voltage according to the power supply voltage, and respectively outputting the working voltage to the conditioning circuit, the voltage-sensitive bridge and the isolation buffer circuit;
the conditioning circuit is used for receiving the working voltage and zeroing the voltage-sensitive bridge according to the working voltage;
the voltage-sensitive bridge is used for receiving the working voltage, detecting the pressure according to the working voltage, generating a voltage to be processed and outputting the voltage to be processed to the conditioning circuit;
the conditioning circuit is further used for receiving the voltage to be processed, generating a conditioning voltage according to the voltage to be processed, and outputting the conditioning voltage to the isolation buffer circuit;
the isolation buffer circuit is used for receiving the working voltage and the conditioning voltage, generating a detection voltage which is stably output according to the working voltage and the conditioning voltage, and outputting the detection voltage to a display module so that the display module displays a pressure value according to the detection voltage.
2. The pressure sensor-based jamming protection circuit of claim 1, wherein the voltage regulation circuit includes a reference voltage source chip, a first resistor, and a first capacitor;
the first end of the first resistor is connected with the voltage output end of the power supply, the second end of the first resistor is respectively connected with the first end of the first capacitor and the reference electrode of the reference voltage source chip, the anode of the reference voltage source chip is grounded, and the second end of the first capacitor is grounded.
3. The pressure sensor-based jamming protection circuit of claim 2, wherein the voltage regulation circuit further comprises a first amplifier, a second resistor, and a third resistor;
the cathode of the reference voltage source chip is connected with the non-inverting input end of the first amplifier, the inverting input end of the first amplifier is respectively connected with the first end of the second resistor and the first end of the third resistor, the output end of the first amplifier is respectively connected with the second end of the second resistor and the first end of the voltage-sensitive bridge, and the second end of the third resistor is grounded.
4. The pressure sensor-based jamming protection circuit of claim 1, wherein the conditioning circuit includes a signal conditioning chip, a fourth resistor, and a second capacitor;
the first end of the signal conditioning chip is connected with the second end of the voltage-sensitive bridge, the second end and the seventh end of the signal conditioning chip are respectively connected with an analog ground, the third end of the signal conditioning chip is connected with the first end of the second capacitor, the second end of the second capacitor is connected with the analog ground, the fourth end of the signal conditioning chip is connected with the first end of the fourth resistor, the second end of the fourth resistor is connected with the analog ground, the fifth end of the signal conditioning chip is connected with the conditioning voltage input end of the isolation buffer circuit, the sixth end of the signal conditioning chip is connected with the working voltage output end of the voltage stabilizing circuit, and the eighth end of the signal conditioning chip is connected with the third end of the voltage-sensitive bridge.
5. The pressure sensor-based jamming protection circuit of claim 4, wherein the conditioning circuit further comprises a zeroing resistor;
the first end of the zero setting resistor is connected with the working voltage output end of the voltage stabilizing circuit, and the second end of the zero setting resistor is connected with the eighth end of the signal conditioning chip.
6. The pressure sensor-based anti-jamming circuit of claim 1, wherein the isolation buffer circuit includes an opto-coupler and a first diode;
the anode of the photoelectric coupler is connected with the conditioning voltage output end of the conditioning circuit, the cathode of the photoelectric coupler is grounded, the anode of the first diode is connected with the working voltage output end of the voltage stabilizing circuit, and the cathode of the first diode is connected with the collector of the photoelectric coupler.
7. The pressure sensor-based jamming circuit of claim 6, wherein the isolation buffer circuit further comprises a first transistor, a second transistor, a fifth resistor, and a sixth resistor;
the emitting electrode of the photoelectric coupler is respectively connected with the emitting electrode of the first triode and the first end of the fifth resistor, the base electrode of the first triode is respectively connected with the second end of the fifth resistor and the emitting electrode of the second triode, the base electrode of the second triode is respectively connected with the collector electrode of the first triode and the first end of the sixth resistor, the collector electrode of the second triode is connected with the display module, and the second end of the sixth resistor is grounded.
8. The pressure sensor-based jamming circuit of any of claims 1 to 7, wherein the pressure sensor-based jamming circuit further comprises a filtering circuit comprising a second amplifier, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a third capacitor, and a fourth capacitor;
the detection voltage output end of the isolation buffer circuit is connected with a first end of a seventh resistor, a second end of the seventh resistor is respectively connected with a first end of an eighth resistor and a first end of a third capacitor, a second end of the seventh resistor is also connected with a first end of a fourth capacitor, a second end of the fourth capacitor is grounded, a second end of the third capacitor is respectively connected with a non-inverting input end of a second amplifier and a first end of a ninth resistor, a non-inverting input end of the second amplifier is respectively connected with a first end of a tenth resistor and a first end of an eleventh resistor, a second end of the ninth resistor and a second end of the tenth resistor are respectively grounded, and an output end of the second amplifier is respectively connected with a second end of the eighth resistor and a second end of the eleventh resistor.
9. A pressure sensor based tamper-resistant device, characterized in that the pressure sensor based tamper-resistant device comprises a pressure sensor based tamper-resistant circuit according to any of claims 1 to 8.
10. A pressure sensor, characterized in that it comprises a pressure sensor based tamper-resistant device according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120592621.9U CN214471434U (en) | 2021-03-23 | 2021-03-23 | Anti-interference circuit and device based on pressure sensor and pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120592621.9U CN214471434U (en) | 2021-03-23 | 2021-03-23 | Anti-interference circuit and device based on pressure sensor and pressure sensor |
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| CN214471434U true CN214471434U (en) | 2021-10-22 |
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| CN202120592621.9U Active CN214471434U (en) | 2021-03-23 | 2021-03-23 | Anti-interference circuit and device based on pressure sensor and pressure sensor |
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| Country | Link |
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| CN (1) | CN214471434U (en) |
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