CN113790837A - Novel pressure detection circuit of digital potentiometer - Google Patents
Novel pressure detection circuit of digital potentiometer Download PDFInfo
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- CN113790837A CN113790837A CN202111085610.2A CN202111085610A CN113790837A CN 113790837 A CN113790837 A CN 113790837A CN 202111085610 A CN202111085610 A CN 202111085610A CN 113790837 A CN113790837 A CN 113790837A
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- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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Abstract
The invention discloses a pressure detection circuit of a novel digital potentiometer, which relates to the field of intelligent detection and control and aims to solve the problem that under the long-term working condition of a mechanical pressure sensor, the contact spring needle is easy to deform to cause poor contact, so that the output signal is unstable and the like, the key point of the technical proposal is that the device comprises a power supply conversion module, a pressure acquisition module, a signal amplification module, a singlechip processing module and a digital potentiometer control module, the power supply conversion module is electrically connected with the pressure acquisition module, the pressure acquisition module is electrically connected with the signal amplification module, the signal amplification module is electrically connected with the single chip microcomputer processing module, the digital potentiometer control module is electrically connected with the single chip microcomputer processing module, the digital potentiometer control module internally comprises a digital potentiometer resistance value correction unit and a digital potentiometer controlled grounding unit. The effects of prolonging the whole service life and ensuring the matching and stable display of the output signal and the display meter are achieved.
Description
Technical Field
The invention relates to the technical field of intelligent detection and control, in particular to a pressure detection circuit of a novel digital potentiometer.
Background
The GY-10 pressure sensor is a linear variable resistance value corresponding to a pressure value, which is formed by converting a pressure signal into a translational contact through mechanical conduction and spring tension by using a mechanical structure and moving on a wire-wound potentiometer of a manganese alloy.
The above prior art solutions have the following drawbacks: the pressure sensor has the advantages of simple working principle, complex structure, more mechanical parts, poor control precision, complex part processing in the manufacturing process, high cost due to the fact that a part of parts need to be provided with a die. In the using process, under the vibration condition of the pressure sensor, the contact is easy to shake, so that the output data jumps to influence the reading; under the long-term working condition, the contact spring needle is easy to deform to cause poor contact, so that an output signal is unstable and the like.
Disclosure of Invention
The invention aims to provide a pressure detection system of a novel digital potentiometer, which replaces a mechanical structure for detection and control.
In order to achieve the purpose, the invention provides the following technical scheme:
a pressure detection system of a novel digital potentiometer comprises a power supply conversion module, a pressure acquisition module, a signal amplification module, a single chip microcomputer processing module and a digital potentiometer control module, wherein the power supply conversion module is electrically connected with the pressure acquisition module, the pressure acquisition module is electrically connected with the signal amplification module, the signal amplification module is electrically connected with the single chip microcomputer processing module, the digital potentiometer control module is electrically connected with the single chip microcomputer processing module, a digital potentiometer resistance correction unit and a digital potentiometer controlled grounding unit are arranged in the digital potentiometer control module, and the digital potentiometer resistance correction unit is electrically connected with the digital potentiometer controlled grounding unit;
the power supply conversion module is used for converting the voltage connected to the pressure acquisition module;
the signal amplification module is used for receiving pressure and converting a pressure signal into a weak point signal;
the single chip microcomputer processing module is used for judging and processing the electric signal of the input port and converting the input signal into a digital signal for controlling the digital potentiometer;
the digital potentiometer control module is used for receiving a signal sent by the single chip microcomputer and displaying the continuous change of the digital potentiometer from the initial value to the maximum rated output value corresponding to the change of the pressure value from the zero position to the rated value;
the digital potentiometer resistance value correction unit is used for adjusting the resistance of the access end of the digital potentiometer and ensuring the interface matching of the display gauge head;
the digital potentiometer controlled grounding unit is used for controlling the two groups of digital potentiometers to be grounded and suspended mutually so as to be matched with the display meter head.
Through adopting above-mentioned technical scheme, use power conversion module, pressure acquisition module, signal amplification module, singlechip processing module and digital potentiometer control module to whole pressure signal conversion who produces for the signal of telecommunication to make things convenient for wholly to detect pressure through the circuit, guarantee whole good detection effect, reduced the wearing and tearing that mechanical type pressure gauge detected probably to produce, guarantee whole good life.
Further, the pressure acquisition module is specifically a pressure ceramic chip, the power conversion module is specifically a 78-series voltage regulator tube, and the signal amplification module is specifically an operational amplifier.
Through adopting above-mentioned technical scheme, pressure ceramic chip response pressure and convert it into the signal of telecommunication, and signal strength depends on the pressure of exerting, makes things convenient for wholly to pressure information gather, and operational amplifier can operate and enlarge the signal that wholly obtains simultaneously, makes things convenient for wholly to calculate and show.
Further, the single chip microcomputer processing module is specifically a single chip microcomputer, and the digital potentiometer control module is specifically a digital potentiometer.
By adopting the technical scheme, the singlechip chip is a small and perfect microcomputer system formed by integrating a central processing unit CPU with data processing capacity, a random access memory RAM, a read only memory ROM, various I/O ports, interrupt systems, a timer/counter and other functions (possibly comprising a display driving circuit, a pulse width modulation circuit, an analog multiplexer, an A/D converter and other circuits) on a silicon chip by adopting a super-large scale integrated circuit technology.
Further, the power conversion module includes a power converter U1 therein, a pin 1 of the power converter U1 is electrically connected to an input 24V voltage source, a pin 2 of the power converter U1 is grounded, the other end of the power converter U1, one end of a low-frequency filter capacitor C1, one end of a high-frequency filter capacitor C2 are electrically connected to a pin 1 of the power converter U2, the other end of the low-frequency filter capacitor C1 is grounded to the other end of the high-frequency filter capacitor C2, a pin 2 of the power converter U2 is grounded, the other end of the power converter U2, one end of a low-frequency filter capacitor C4 and the high-frequency filter capacitor C5 are electrically connected, and the other ends of the low-frequency filter capacitor C4 and the high-frequency filter capacitor C5 are grounded.
Through adopting above-mentioned technical scheme, use power converter U1 to adjust the power of whole access to guarantee that the access power accords with the rated voltage of whole operation, so that whole normal operation.
Furthermore, the pressure acquisition module comprises a ceramic pressure chip R4, a pin 2 of the ceramic pressure chip R4 is electrically connected with a 5V voltage source converted by the power conversion module, a pin 4 of the ceramic pressure chip R4 is grounded, a pin 1 of the ceramic pressure chip R4, one end of a filter capacitor C7, one end of a filter capacitor C8 and one end of an input resistor R6 are electrically connected, a pin 3 of the ceramic pressure chip R4 is electrically connected with the other end of the filter capacitor C7, the other end of the filter capacitor C8 and the input resistor R5, the other end of the input resistor R5, the connection cathode of the operational amplifier IC2, one end of a feedback resistor R9 and one end of a feedback capacitor C3 are electrically connected, the other end of the input resistor R6, the connection anode of the operational amplifier IC2 and one end of a bias resistor R7 are electrically connected, the other end of the feedback capacitor C3, one end of a gain adjustment potentiometer RW2 and one end of the bias resistor R1 are electrically connected, the other end of the feedback resistor R9 is electrically connected with one end of a gain adjustment potentiometer RW2, the output end of the operational amplifier IC2, one end of the gain adjustment potentiometer RW2 and one end of an output current limiting resistor R10 are electrically connected, one end of the operational amplifier IC2 is electrically connected with a 15V voltage source, one end of the operational amplifier IC2 is grounded, the other end of the bias resistor R1 is grounded, the other end of the bias resistor R7, one end of the bias resistor R8 and one end of a zero adjustment potentiometer RW1 are electrically connected, the other end of the bias resistor R8 is grounded, one end of the zero adjustment potentiometer RW1 is electrically connected with a 5V voltage source, one end of the zero adjustment potentiometer RW1 is grounded, and the other end of the output current limiting resistor R10 is electrically connected with the single chip microcomputer processing module.
Through adopting above-mentioned technical scheme, use ceramic pressure chip to carry out the record to the pressure information that produces, simultaneously through operational amplifier, amplify faint signal of telecommunication into the standard signal of telecommunication that can handle, conveniently wholly carry out the detection of pressure, increased holistic practicality.
Furthermore, the single chip microcomputer processing module comprises a single chip microcomputer IC4, a pin 4 of the single chip microcomputer IC4 is electrically connected with a pin 2 of a four-core 2.54mm single-row welding pin S1, a pin 1 of the four-core 2.54mm single-row welding pin S1 is grounded, a pin 3 of the four-core 2.54mm single-row welding pin S1 is electrically connected with a pin 5 of the single chip microcomputer IC4, a pin 4 of the four-core 2.54mm single-row welding pin S1 is electrically connected with a rated voltage source, a pin 6 of the single chip microcomputer IC4, one end of a crystal oscillator Y1 and one end of a high-frequency oscillation capacitor C10 are electrically connected, a pin 7 of the single chip microcomputer IC4, the other end of the crystal oscillator Y1 and one end of a high-frequency oscillation capacitor C11 are electrically connected, the other end of the high-frequency oscillation capacitor C11 and the other end of the high-frequency oscillation capacitor C10 are grounded, a pin 28 of the pin 4, one end of the filter capacitor C14 and one end of the filter capacitor C12 are electrically connected with the filter capacitor C12, one end of the filter capacitor C12 and one end of the filter capacitor C14 are electrically connected with a 5V voltage source, a pin 19 of the singlechip IC4, one end of the input resistor R14 and one end of the anti-signal-jitter anti-interference capacitor C13 are electrically connected, the other end of the anti-signal-jitter anti-interference capacitor C13 is grounded, the other end of the input resistor R14 is electrically connected with the other end of the output current-limiting resistor R10, a pin 16 of the singlechip IC4 is electrically connected with one end of the output resistor R13, the other end of the output resistor R13 is electrically connected with one end of the power control device T1, one end of the power control device T1 is grounded, a pin 15 of the singlechip IC4 is electrically connected with one end of the output resistor R15, the other end of the output resistor R15 is electrically connected with one end of the power control device T2, and one end of the power control device T2 is grounded.
Through adopting above-mentioned technical scheme, the singlechip is judged and is handled the signal of telecommunication of input port, converts input signal into the digital signal of control digital potentiometer, guarantees simultaneously that whole can fully detect pressure and change, guarantees the precision of whole detection.
Furthermore, the digital potentiometer control module internally comprises a digital potentiometer IC1 and a digital potentiometer IC3, wherein a pin 1 of the digital potentiometer IC1 is electrically connected with a pin 25 of the singlechip IC4, a pin 2 of the digital potentiometer IC1 is electrically connected with a pin 24 of the singlechip IC4, a pin 3 of the digital potentiometer IC1 is electrically connected with a pin 23 of the singlechip IC4, a pin 4 of the digital potentiometer IC1 is grounded, a pin 1 of the digital potentiometer IC3 is electrically connected with a pin 22 of the singlechip IC4, a pin 2 of the digital potentiometer IC3 is electrically connected with a pin 21 of the singlechip IC4, a pin 3 of the digital potentiometer IC3 is electrically connected with a pin 20 of the singlechip IC4, a pin 4 of the digital potentiometer IC3 is grounded, a pin 8 of the digital potentiometer IC1, one end of a filter capacitor C6 and a rated voltage source are electrically connected, the other end of the filter capacitor C6 is grounded, one end of the filter capacitor IC3 6 and one end of the filter capacitor C9 are electrically connected with the rated voltage source 67676726, the other end of the filter capacitor C9 is grounded, the pin 7 of the digital potentiometer IC1 is electrically connected with one end of a potentiometer resistance value correcting resistor R2, the pin 6 of the digital potentiometer IC1 and the other end of the potentiometer resistance value correcting resistor R2 are electrically connected with one end of a potentiometer resistance value correcting resistor R3, the pin 5 of the digital potentiometer IC1, the other end of the potentiometer resistance value correcting resistor R3 and one end of the potentiometer resistance value correcting resistor R11 are electrically connected with the pin 7 of the digital potentiometer IC3, the pin 6 of the digital potentiometer IC3, the other end of the potentiometer resistance value correcting resistor R11 are electrically connected with one end of the potentiometer resistance value correcting resistor R12, and the pin 5 of the digital potentiometer IC3 is electrically connected with the other end of the potentiometer resistance value correcting resistor R12.
By adopting the technical scheme, the change of the pressure value from the zero position to the rated value corresponds to the continuous change of the digital potentiometer from the initial zero point to the maximum value through the signal sent by the single chip microcomputer, meanwhile, the output port of the GY-10 mechanical pressure sensor is a 255-omega potentiometer, the conventional resistance value of the digital potentiometer is 5K omega or 10K omega, and the external resistors of the pins of the digital potentiometer are connected in parallel to ensure the interface matching with the display meter head.
Further, the controlled grounding unit of the digital potentiometer comprises a two-way control optical coupling relay IC5, a first measuring circuit of the two-way control optical coupling relay IC5 is electrically connected with the other end of a power control device T1, a second measuring circuit of the two-way control optical coupling relay IC5 is electrically connected with the other end of a power control device T2, a first measuring circuit and a second measuring circuit of the second-way control optical coupling relay IC5 are both connected with a 5V voltage source, one end of the first control circuit of the two-way control optical coupling relay IC5, a pin 6 of the digital potentiometer IC1, the other end of the potentiometer resistance value correcting resistor R2 and one end of the potentiometer resistance value correcting resistor R3 are electrically connected, one end of the second control circuit of the two-way control optical coupling relay IC5, a pin 6 of the digital potentiometer IC3, the other end of the potentiometer resistance value correcting resistor R11 and one end of the potentiometer resistance value correcting resistor R12 are electrically connected, and the other ends of the first control circuit and the second control circuit of the double-path control optical coupling relay IC5 are grounded.
By adopting the technical scheme, the singlechip determines the on and off of the power devices T1 and T2 according to the input signal, controls the on and off of the MOS tube in the double-path optical coupling relay, further controls whether the PW0 pin in the IC1 and the IC2 is grounded, and achieves the smooth transition of the serial resistance of the two digital potentiometers.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the pressure acquisition module and the signal amplification module are adopted, so that an electronic circuit replaces a mechanical structure, mechanical abrasion is solved, the testing precision is improved, and the effect of prolonging the whole service life is achieved;
2. the single chip microcomputer and the digital potentiometer are adopted to process pressure signals, the single chip microcomputer is used for controlling two groups of digital potentiometers to be designed in series, the resistance values of the digital potentiometers are corrected through parallel resistors and matched with corresponding display meter heads, the resistance values of the digital potentiometers are corrected through the series-parallel resistors, the output signals are guaranteed to be matched with the original display meter, and the effect of guaranteeing the output signals to be matched with the display meter is achieved;
3. the double-path optical coupling relay is adopted, so that the tap pins of the two digital potentiometers are grounded in turn, the smooth transition of the resistance value and the stable display of the gauge outfit are ensured, and the effect of stable display is generated.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic diagram of a power conversion circuit according to the present invention;
FIG. 3 is a schematic diagram of a pressure acquisition signal generating circuit according to the present invention;
FIG. 4 is a schematic diagram of a four-core single row bonding pin circuit of the present invention;
FIG. 5 is a schematic diagram of the structure of the processing circuit of the single chip microcomputer of the present invention;
FIG. 6 is a schematic diagram of a digital potentiometer control circuit according to the present invention;
fig. 7 is a schematic diagram of a controlled grounding circuit of the digital potentiometer according to the present invention.
Detailed Description
The method of the present invention is described in further detail below with reference to the accompanying drawings.
Referring to the attached figure 1, a novel pressure detection system of a digital potentiometer comprises a power conversion module, a pressure acquisition module, a signal amplification module, a single chip microcomputer processing module and a digital potentiometer control module, wherein the power conversion module is electrically connected with the pressure acquisition module, the pressure acquisition module is electrically connected with the signal amplification module, the signal amplification module is electrically connected with the single chip microcomputer processing module, the digital potentiometer control module internally comprises a digital potentiometer resistance correction unit and a digital potentiometer controlled grounding unit, the digital potentiometer resistance correction unit is electrically connected with the digital potentiometer controlled grounding unit, the power conversion module is used for converting voltage connected to the pressure acquisition module, the signal amplification module is used for receiving pressure and converting a pressure signal into a weak point signal, and the single chip microcomputer processing module is used for judging and processing an electric signal at an input port, the digital potentiometer controlled grounding unit is used for controlling two groups of digital potentiometers to be grounded and suspended mutually to be matched with the display meter head, the pressure acquisition module is specifically a pressure ceramic chip, the power supply conversion module is specifically a 78-series voltage stabilizing tube, the signal amplification module is specifically an operational amplifier, the single chip microcomputer processing module is specifically a single chip microcomputer, and the digital potentiometer control module is specifically a digital potentiometer.
Referring to fig. 2, the power conversion module includes a power converter U1 therein, a pin 1 of the power converter U1 is electrically connected to an input 24V voltage source, a pin 2 of the power converter U1 is grounded, the other end of the power converter U1, one end of a low-frequency filter capacitor C1, one end of a high-frequency filter capacitor C2 are electrically connected to a pin 1 of the power converter U2, a low-frequency filter capacitor C1 is grounded to the other end of the high-frequency filter capacitor C2, a pin 2 of the power converter U2 is grounded, the other end of the power converter U2, one end of a low-frequency filter capacitor C4 are electrically connected to the high-frequency filter capacitor C5, the other ends of the low-frequency filter capacitor C4 and the high-frequency filter capacitor C5 are grounded, the U1 converts a 24V voltage to a 15V voltage, and the U2 converts a 15V voltage to a 5V voltage, thereby ensuring normal operation of the whole.
Referring to fig. 3, the pressure acquisition module includes a ceramic pressure chip R4, a pin 2 of the ceramic pressure chip R4 is electrically connected to a 5V voltage source converted by the power conversion module, a pin 4 of the ceramic pressure chip R4 is grounded, a pin 1 of the ceramic pressure chip R4, one end of a filter capacitor C7, one end of a filter capacitor C8 are electrically connected to one end of an input resistor R6, a pin 3 of the ceramic pressure chip R4 is electrically connected to the other end of the filter capacitor C7, the other end of the filter capacitor C8 is electrically connected to the input resistor R5, the other end of the input resistor R5, the negative terminal of the operational amplifier IC2, one end of a feedback resistor R9 and one end of a feedback capacitor C3, the other end of the input resistor R6, the positive terminal of the operational amplifier IC2 and one end of a bias resistor R7 are electrically connected, the other end of the feedback capacitor C3, one end of a gain adjustment potentiometer R2 and one end of a bias resistor R1 are electrically connected, the other end of the feedback resistor R9 is electrically connected to one end of a gain adjustment potentiometer 2, the output end of the operational amplifier IC2, one end of the gain adjustment potentiometer RW2 and one end of the output current limiting resistor R10 are electrically connected, one end of the operational amplifier IC2 is electrically connected with a 15V voltage source, one end of the operational amplifier IC2 is grounded, the other end of the bias resistor R1 is grounded, one end of the bias resistor R7, one end of the bias resistor R8 and one end of the zero adjustment potentiometer RW1 are electrically connected, the other end of the bias resistor R8 is grounded, one end of the zero adjustment potentiometer RW1 is electrically connected with a 5V voltage source, one end of the zero adjustment potentiometer RW1 is grounded, the other end of the output current limiting resistor R10 is electrically connected with the single chip microcomputer processing module, when external pressure is applied, the ceramic pressure chips R41 and 3 pins output weak electric signals, and the C7 and C8 are filter capacitors and filter the output signals of the pressure ceramic chips, so that accurate pressure can be conveniently detected integrally.
Referring to fig. 4 and 5, the single chip microcomputer processing module includes a single chip microcomputer IC4, 4 pins of the single chip microcomputer IC4 are electrically connected with 2 pins of a four-core 2.54mm single-row welding pin S1, 1 pin of a four-core 2.54mm single-row welding pin S1 is grounded, 3 pins of a four-core 2.54mm single-row welding pin S1 are electrically connected with 5 pins of a single chip microcomputer IC4, 4 pins of a four-core 2.54 single-row welding pin S1 are electrically connected with a rated voltage source, 6 pins of the single chip microcomputer IC4, one end of a crystal oscillator Y1 and one end of a high-frequency oscillation capacitor C10 are electrically connected, 7 pins of the single chip microcomputer IC4, the other end of the crystal oscillator Y1 and one end of a high-frequency oscillation capacitor C11 are electrically connected, the other end of the high-frequency oscillation capacitor C11 and the other end of the high-frequency oscillation capacitor C10 are grounded, 28 pins of the single chip microcomputer IC4, one end of the filter capacitor C12 and one end of the filter capacitor C14 are electrically connected with one end of the filter capacitor C12, the other end of the filter capacitor C14 and the filter capacitor C14 are electrically connected with the voltage source, the single chip microcomputer IC4 has pin 19, input resistor R14 with one end connected electrically to the anti-interference capacitor C13, anti-interference capacitor C13 with the other end connected to ground, input resistor R14 with the other end connected electrically to the output current limiting resistor R10, single chip microcomputer IC4 with pin 16 connected electrically to the output resistor R13, output resistor R13 with the other end connected electrically to one end of the power controller T1, power controller T1 with one end connected electrically to ground, single chip microcomputer IC4 with pin 15 connected electrically to one end of the output resistor R15, output resistor R15 with the other end connected electrically to one end of the power controller T2, power controller T2 with one end connected to ground, IC4 being single chip microcomputer, working voltage 5V, analog signal input and digital signal output to ensure the integral processing and display of the received signal and convenient pressure detection Random access memory RAM, read only memory ROM, various I/O ports and interrupt system, timer/counter and other functions (including display driver circuit, pulse width modulator circuit, analog multiplexer, A/D converter, etc) are integrated into one silicon chip to form one small and perfect microcomputer system.
Referring to fig. 6, the digital potentiometer control module includes a digital potentiometer IC1 and a digital potentiometer IC3, a pin 1 of the digital potentiometer IC1 is electrically connected to a pin 25 of the single chip IC4, a pin 2 of the digital potentiometer IC1 is electrically connected to a pin 24 of the single chip IC4, a pin 3 of the digital potentiometer IC1 is electrically connected to a pin 23 of the single chip IC4, a pin 4 of the digital potentiometer IC1 is grounded, a pin 1 of the digital potentiometer IC3 is electrically connected to a pin 22 of the single chip IC4, a pin 2 of the digital potentiometer IC3 is electrically connected to a pin 21 of the single chip IC4, a pin 3 of the digital potentiometer IC3 is electrically connected to a pin 20 of the single chip IC4, a pin 4 of the digital potentiometer IC3 is grounded, a pin 8 of the digital potentiometer IC1, one end of the filter capacitor C6 is electrically connected to a rated voltage source, the other end of the filter capacitor C6 is grounded, a pin 8 of the digital potentiometer IC3, one end of the filter capacitor C9 is electrically connected to a voltage source 9, the pin 7 of the digital potentiometer IC1 is electrically connected with one end of a potentiometer resistance value correcting resistor R2, the pin 6 of the digital potentiometer IC1, the other end of the potentiometer resistance value correcting resistor R2 are electrically connected with one end of the potentiometer resistance value correcting resistor R3, the pin 5 of the digital potentiometer IC1, the other end of the potentiometer resistance value correcting resistor R3 and one end of the potentiometer resistance value correcting resistor R11 are electrically connected with the pin 7 of the digital potentiometer IC3, the pin 6 of the digital potentiometer IC3 and the other end of the potentiometer resistance value correcting resistor R11 are electrically connected with one end of a potentiometer resistance value correcting resistor R12, the pin 5 of the digital potentiometer IC3 is electrically connected with the other end of the potentiometer resistance value correcting resistor R12, two groups of digital potentiometers are controlled by a single chip microcomputer to be designed in series, the resistance value of the digital potentiometer is corrected by parallel resistors, and the digital potentiometer is matched with a display meter head and is also called a programmable resistor, the integrated circuit is a novel CMOS digital and analog mixed signal processing integrated circuit which replaces a traditional mechanical potentiometer (analog potentiometer). The digital potentiometer is controlled by digital input to generate an analog output, and the maximum tap current can be from hundreds of microamperes to a few milliamperes depending on the digital potentiometer. The digital potentiometer adopts a numerical control mode to adjust the resistance value, and has the remarkable advantages of flexible use, high adjustment precision, no contact, low noise, difficult contamination, vibration resistance, interference resistance, small volume, long service life and the like.
Referring to fig. 7, the controlled grounding unit of the digital potentiometer comprises a dual-path control optocoupler relay IC5, a first measuring circuit of a dual-path control optocoupler relay IC5 is electrically connected with the other end of a power control device T1, a second measuring circuit of the dual-path control optocoupler relay IC5 is electrically connected with the other end of the power control device T2, a first measuring circuit and a second measuring circuit of a second dual-path control optocoupler relay IC5 are both connected with a 5V voltage source, one end of the first control circuit of a dual-path control optocoupler relay IC5, a pin 6 of a digital potentiometer IC1, the other end of a potentiometer resistance value correcting resistor R2 and one end of a potentiometer resistance value correcting resistor R3 are electrically connected, one end of the second control circuit of the dual-path control optocoupler relay IC5, a pin 6 of the digital potentiometer IC3, the other end of the potentiometer resistance value correcting resistor R11 and one end of a potentiometer resistance correcting resistor R12 are electrically connected, the other ends of the first control circuit and the second control circuit of the optocoupler relay IC5 are grounded, the IC5 is a double-circuit control optical coupling relay, the single chip microcomputer determines the on and off of the power devices T1 and T2 according to input signals, the on and off of MOS (metal oxide semiconductor) tubes in the double-circuit optical coupling relay are controlled, and then the PW0 pins in the IC1 and the IC2 are controlled to be grounded, so that the smooth transition of serial resistance values of two digital potentiometers is achieved.
The working principle is as follows: the pressure signal is converted into a weak electric signal through a pressure ceramic chip, an operational amplifier amplifies the weak electric signal detected by the pressure ceramic chip into a processable standard electric signal, a single chip microcomputer judges and processes the electric signal of an input port, the input signal is converted into a digital signal for controlling a digital potentiometer, the digital potentiometer sends out a signal through the single chip microcomputer, the change of a pressure value from a zero position to a rated value corresponds to the continuous change of the digital potentiometer from an initial zero point to a maximum value, because an output port of a GY-10 mechanical pressure sensor is a 255 omega potentiometer, the conventional resistance value of the digital potentiometer is 5K omega or 10K omega, the external resistor of a pin of the digital potentiometer is connected in parallel to ensure the interface matching with a display meter head, and meanwhile, the 10K omega digital potentiometer is obtained through calculation to ensure the matching with the display meter head, the resistance value of the two digital potentiometers is required to be connected in series, the required resistance value can be reached only by connecting the two 10K omega digital potentiometers in series, in order to ensure the smooth transition of the serial resistance value of the two digital potentiometers, the PW0 taps of the digital potentiometers are required to be connected in turn to be grounded, namely, the two taps of the two digital potentiometers after being connected in series are required to be grounded, one tap is grounded in the process of changing the pressure value from small to large, the other tap is suspended, the tap is suspended after the pressure value reaches a certain value, the other tap is grounded, the pressure value is convenient to be integrally detected, the loss caused by mechanical detection is reduced, and the service life of the whole is prolonged.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The utility model provides a novel pressure detection circuit of digital potentiometer, includes power conversion module, pressure acquisition module, signal amplification module, singlechip processing module and digital potentiometer control module, its characterized in that: the digital potentiometer control module is internally provided with a digital potentiometer resistance correction unit and a digital potentiometer controlled grounding unit, and the digital potentiometer resistance correction unit is electrically connected with the digital potentiometer controlled grounding unit;
the power supply conversion module is used for converting the voltage connected to the pressure acquisition module;
the signal amplification module is used for receiving pressure and converting a pressure signal into a weak point signal;
the single chip microcomputer processing module is used for judging and processing the electric signal of the input port and converting the input signal into a digital signal for controlling the digital potentiometer;
the digital potentiometer control module is used for receiving a signal sent by the single chip microcomputer and displaying the continuous change of the digital potentiometer from the initial value to the maximum rated output value corresponding to the change of the pressure value from the zero position to the rated value;
the digital potentiometer resistance value correction unit is used for adjusting the resistance of the access end of the digital potentiometer and ensuring the interface matching of the display gauge head;
the digital potentiometer controlled grounding unit is used for controlling the two groups of digital potentiometers to be grounded and suspended mutually so as to be matched with the display meter head.
2. The pressure detection circuit of the novel digital potentiometer according to claim 1, characterized in that: the pressure acquisition module is specifically a pressure ceramic chip, the power conversion module is specifically a 78-series voltage regulator tube, and the signal amplification module is specifically an operational amplifier.
3. The pressure detection circuit of the novel digital potentiometer according to claim 1, characterized in that: the single-chip microcomputer processing module is a single-chip microcomputer, and the digital potentiometer control module is a digital potentiometer.
4. The pressure detection circuit of the novel digital potentiometer according to claim 1, characterized in that: the inside power conversion module that includes power converter U1, power converter U1's 1 foot is connected with the 24V voltage source electricity of input, power converter U1's 2 feet ground connection, power converter U1 other end, low frequency filter capacitor C1 one end, high frequency filter capacitor C2 one end and power converter U2's 1 foot electricity are connected, low frequency filter capacitor C1 and high frequency filter capacitor C2's other end ground connection, power converter U2's 2 feet ground connection, power converter U2 other end, low frequency filter capacitor C4 one end and high frequency filter capacitor C5 electricity are connected, low frequency filter capacitor C4 and high frequency filter capacitor C5's other end ground connection.
5. The pressure detection circuit of the novel digital potentiometer according to claim 1, characterized in that: the pressure acquisition module comprises a ceramic pressure chip R4, wherein a pin 2 of the ceramic pressure chip R4 is connected with a 5V power supply converted by the power conversion module, a pin 4 of the ceramic pressure chip R4 is grounded, a pin 1 of the ceramic pressure chip R4, one end of a filter capacitor C7, one end of a filter capacitor C8 and one end of an input resistor R6 are electrically connected, a pin 3 of the ceramic pressure chip R4 is electrically connected with the other end of the filter capacitor C7, the other end of the filter capacitor C8 and the input resistor R5, the other end of the input resistor R5, the access cathode of an operational amplifier IC2, one end of a feedback resistor R9 and one end of a feedback capacitor C3 are electrically connected, the other end of the input resistor R6, the access anode of the operational amplifier IC2 and one end of a bias resistor R7 are electrically connected, the other end of the feedback capacitor C3, one end of a gain adjustment potentiometer RW2 and one end of a bias resistor R1 are electrically connected, the other end of the feedback resistor R9 is electrically connected with one end of a gain adjustment potentiometer RW2, the output end of the operational amplifier IC2, one end of the gain adjustment potentiometer RW2 and one end of an output current limiting resistor R10 are electrically connected, one end of the operational amplifier IC2 is electrically connected with a 15V voltage source, one end of the operational amplifier IC2 is grounded, the other end of the bias resistor R1 is grounded, the other end of the bias resistor R7, one end of the bias resistor R8 and one end of a zero adjustment potentiometer RW1 are electrically connected, the other end of the bias resistor R8 is grounded, one end of the zero adjustment potentiometer RW1 is electrically connected with a 5V voltage source, one end of the zero adjustment potentiometer RW1 is grounded, and the other end of the output current limiting resistor R10 is electrically connected with the single chip microcomputer processing module.
6. The pressure detection circuit of the novel digital potentiometer according to claim 5, wherein: the single chip microcomputer processing module comprises a single chip microcomputer IC4, wherein 4 feet of the single chip microcomputer IC4 are electrically connected with 2 feet of four-core 2.54mm single-row welding pins S1, 1 foot of the four-core 2.54mm single-row welding pins S1 is grounded, 3 feet of the four-core 2.54mm single-row welding pins S1 are electrically connected with 5 feet of a single chip microcomputer IC4, 4 feet of the four-core 2.54mm single-row welding pins S1 are electrically connected with a rated voltage source, 6 feet of the single chip microcomputer IC4, one end of a crystal oscillator Y1 and one end of a high-frequency oscillation capacitor C10 are electrically connected, the other ends of 7 feet of the single chip microcomputer IC4 and the crystal oscillator Y1 are electrically connected with one end of a high-frequency oscillation capacitor C11, the other end of the high-frequency oscillation capacitor C11 and the other end of the high-frequency oscillation capacitor C10 are grounded, one end of 28 feet of the filter capacitor C4, one end of the filter capacitor C14 and one end of the filter capacitor C12 are electrically connected with the other end of the filter capacitor C14, one end of the filter capacitor C12 and one end of the filter capacitor C14 are electrically connected with a 5V voltage source, a pin 19 of the singlechip IC4, one end of the input resistor R14 and one end of the anti-signal-jitter anti-interference capacitor C13 are electrically connected, the other end of the anti-signal-jitter anti-interference capacitor C13 is grounded, the other end of the input resistor R14 is electrically connected with the other end of the output current-limiting resistor R10, a pin 16 of the singlechip IC4 is electrically connected with one end of the output resistor R13, the other end of the output resistor R13 is electrically connected with one end of the power control device T1, one end of the power control device T1 is grounded, a pin 15 of the singlechip IC4 is electrically connected with one end of the output resistor R15, the other end of the output resistor R15 is electrically connected with one end of the power control device T2, and one end of the power control device T2 is grounded.
7. The pressure detection circuit of the novel digital potentiometer according to claim 6, wherein: the digital potentiometer control module comprises a digital potentiometer IC1 and a digital potentiometer IC3, wherein a pin 1 of the digital potentiometer IC1 is electrically connected with a pin 25 of a singlechip IC4, a pin 2 of the digital potentiometer IC1 is electrically connected with a pin 24 of the singlechip IC4, a pin 3 of the digital potentiometer IC1 is electrically connected with a pin 23 of the singlechip IC4, a pin 4 of the digital potentiometer IC1 is grounded, a pin 1 of the digital potentiometer IC3 is electrically connected with a pin 22 of the singlechip IC4, a pin 2 of the digital potentiometer IC3 is electrically connected with a pin 21 of the singlechip IC4, a pin 3 of the digital potentiometer IC3 is electrically connected with a pin 20 of the singlechip IC4, a pin 4 of the digital potentiometer IC3 is grounded, a pin 8 of the digital potentiometer IC1, one end of a filter capacitor C6 is electrically connected with a rated voltage source, the other end of the filter capacitor C6 is grounded, and one end of the filter capacitor C3 6 and the rated voltage source 6767 9 of the digital potentiometer IC2 are electrically connected, the other end of the filter capacitor C9 is grounded, the pin 7 of the digital potentiometer IC1 is electrically connected with one end of a potentiometer resistance value correcting resistor R2, the pin 6 of the digital potentiometer IC1 and the other end of the potentiometer resistance value correcting resistor R2 are electrically connected with one end of a potentiometer resistance value correcting resistor R3, the pin 5 of the digital potentiometer IC1, the other end of the potentiometer resistance value correcting resistor R3 and one end of the potentiometer resistance value correcting resistor R11 are electrically connected with the pin 7 of the digital potentiometer IC3, the pin 6 of the digital potentiometer IC3, the other end of the potentiometer resistance value correcting resistor R11 are electrically connected with one end of the potentiometer resistance value correcting resistor R12, and the pin 5 of the digital potentiometer IC3 is electrically connected with the other end of the potentiometer resistance value correcting resistor R12.
8. The pressure detection circuit of the novel digital potentiometer according to claim 7, wherein: the controlled grounding unit of the digital potentiometer comprises a double-path control optocoupler relay IC5, a first measuring circuit of a double-path control optocoupler relay IC5 is electrically connected with the other end of a power control device T1, a second measuring circuit of the double-path control optocoupler relay IC5 is electrically connected with the other end of the power control device T2, a first measuring circuit and a second measuring circuit of a second path control optocoupler relay IC5 are both connected with a voltage source of 5V, one end of the first control circuit of the double-path control optocoupler relay IC5, a pin 6 of the digital potentiometer IC1, the other end of a potentiometer resistance value correction resistor R2 and one end of a potentiometer resistance value correction resistor R3 are electrically connected, one end of the second control circuit of the double-path control optocoupler relay IC5, a pin 6 of the digital potentiometer IC3, the other end of the potentiometer resistance value correction resistor R11 and one end of a potentiometer resistance value correction resistor R12 are electrically connected, and the other ends of the first control circuit and the second control circuit of the double-path control optical coupling relay IC5 are grounded.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111085610.2A CN113790837A (en) | 2021-09-16 | 2021-09-16 | Novel pressure detection circuit of digital potentiometer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111085610.2A CN113790837A (en) | 2021-09-16 | 2021-09-16 | Novel pressure detection circuit of digital potentiometer |
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| CN113790837A true CN113790837A (en) | 2021-12-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115495298A (en) * | 2022-11-08 | 2022-12-20 | 北京紫光芯能科技有限公司 | Method and device for testing IO driving capability |
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- 2021-09-16 CN CN202111085610.2A patent/CN113790837A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115495298A (en) * | 2022-11-08 | 2022-12-20 | 北京紫光芯能科技有限公司 | Method and device for testing IO driving capability |
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Application publication date: 20211214 |