CN110907072A - Pressure transmitter circuit with hysteresis switch - Google Patents
Pressure transmitter circuit with hysteresis switch Download PDFInfo
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- CN110907072A CN110907072A CN201911113482.0A CN201911113482A CN110907072A CN 110907072 A CN110907072 A CN 110907072A CN 201911113482 A CN201911113482 A CN 201911113482A CN 110907072 A CN110907072 A CN 110907072A
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- circuit
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- hysteresis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/005—Measuring force or stress, in general by electrical means and not provided for in G01L1/06 - G01L1/22
Abstract
The invention relates to a transmitter circuit with a hysteresis switch, which comprises a signal conditioning circuit, a hysteresis comparison circuit, a reference voltage circuit, an overvoltage protection circuit and a switch action circuit; the hysteresis switch circuit is designed according to the requirement of the pressure switch on pressure disturbance resistance, so that a high-precision disturbance-resistant pressure hysteresis passive switch signal is realized, and an analog electric signal can be output.
Description
Technical Field
The invention belongs to the field of circuit design, and relates to a pressure transmitter circuit with a hysteresis switch.
Background
The existing pressure transmitter circuit mainly comprises a signal conditioning circuit and a switch action circuit, and is mainly used for quantitatively measuring the magnitude of a pressure value when only the signal conditioning circuit is used, so that a switch signal cannot be output; when the signal conditioning circuit and the switch signal circuit are used simultaneously, when the pressure reaches the switch position quantity, the fluctuation of the switch signal is easily caused, the switch is repeatedly opened and closed, the disorder of the signal is caused, and the service life of the switch is also shortened.
Disclosure of Invention
The invention provides a pressure transmitter circuit with a hysteresis switch, which is additionally provided with a hysteresis comparison unit in the circuit, can effectively reduce the influence of switch signal fluctuation caused by signal disturbance, and can simultaneously generate electric signals.
The invention provides a pressure transmitter circuit with a hysteresis switch, which comprises a signal conditioning circuit, a hysteresis comparison circuit, a reference circuit and a switch action circuit,
the signal conditioning circuit, the reference circuit, the overvoltage protection circuit and the switch action circuit are respectively and electrically connected with the hysteresis comparison circuit;
the signal conditioning circuit is used for conditioning the input first electric signal and outputting a second electric signal to the hysteresis comparison circuit;
the hysteresis comparison circuit is used for comparing an input 0-5V voltage signal with the output voltage of the reference circuit, performing hysteresis operation and outputting high and low levels to the switch action circuit;
the switching operation circuit outputs a first switching signal at a high level and outputs a second switching signal at the high level.
Further, the pressure transmitter circuit further comprises an overvoltage protection circuit, the overvoltage protection circuit and the hysteresis comparison circuit, and the overvoltage protection circuit is used for limiting the output voltage of the hysteresis comparison circuit.
Further, the hysteresis comparison circuit comprises resistors R11, R12, R13, R15, R9 and R10, an operational amplifier and a first power supply VDD1,
one end of the resistor R11 is connected with the signal conditioning circuit; the other end of the resistor R11, one end of the resistor R13, one end of the resistor R10 and the positive end of the operational amplifier are connected with each other;
the other end of the resistor R13 is connected with one end of a resistor R12; the other end of the resistor R10 is grounded; the negative end of the operational amplifier is connected with the reference circuit, and the output end of the operational amplifier is connected with one end of a resistor R15;
the other end of the resistor R12, the other end of the resistor R15 and one end of the resistor R9 are connected with each other and are connected with an overvoltage protection circuit; the other end of the resistor R9 is connected to a switching operation circuit.
Further, the reference circuit comprises a voltage stabilizing diode V4, a resistor R14, a second power supply VDD2,
the negative end of the voltage stabilizing diode V4 is connected with the negative end of the operational amplifier and one end of the resistor R14; the positive terminal of the voltage-stabilizing diode V4 is grounded, and the other terminal of the resistor R14 is connected with a second power supply VDD 2.
Further, the overvoltage protection circuit comprises a voltage stabilizing diode V1, the negative terminal of the voltage stabilizing diode V1 is connected with the resistor R12, the resistor R15 and the resistor R9, and the positive terminal of the voltage stabilizing diode V1 is grounded.
Further, the switch action circuit comprises a triode, a diode V2, a relay and a third power supply VDD3,
the base electrode of the triode is connected with the other end of the resistor R9, the collector electrode of the triode is connected with the relay, and the emitter electrode of the triode is grounded;
the positive end of the diode V2 is connected with the collector of the triode, and the negative end of the diode V2 is connected with one end of the relay connected with the third power supply VDD 3.
Further, the second electrical signal is a voltage signal or a current signal.
Further, the first power supply VDD1, the second power supply connection VDD2 and the third power supply VDD3 are the same power supply.
The invention has the technical effects that:
in industrial application, various non-electric physical quantities measured by a transducer need to be converted into qualitative quantity values and quantitative quantity values, and in order to avoid interference of sensitive signal fluctuation on the qualitative quantity values when sensitive quantities are measured, hysteresis anti-interference processing needs to be added into a circuit, and sometimes, quantitative measurement needs to be carried out, and corresponding analog quantity values need to be output. The invention redesigns the original transmitter and adds a hysteresis comparison unit in the circuit, thereby effectively reducing the influence of qualitative signal fluctuation caused by signal disturbance and simultaneously providing analog signals.
Detailed Description
Example 1
Fig. 1 is a schematic block diagram of a transmitter design circuit with a hysteresis switch, and as shown in fig. 1, this embodiment provides a pressure transmitter circuit with a hysteresis switch, where the pressure transmitter circuit includes a signal conditioning circuit, a hysteresis comparison circuit, a reference circuit, and a switch action circuit, and the signal conditioning circuit, the reference circuit, the overvoltage protection circuit, and the switch action circuit are electrically connected to the hysteresis comparison circuit, respectively.
And the signal conditioning circuit is used for conditioning the input first electric signal and outputting a second electric signal to the hysteresis comparison circuit. The first electric signal is an electric signal which is obtained by converting a pressure signal into a pressure signal by a pressure sensitive element and is in direct proportion to the pressure signal, and is generally a millivolt-level micro signal, and the second electric signal is a volt-level or milliamp-level signal which is amplified, compensated and linearized by an output signal conditioning circuit, such as a 0V-5V voltage signal or a 4 mA-20 mA current signal.
The hysteresis comparison circuit is used for comparing an input 0-5V voltage signal with the output voltage of the reference circuit, performing hysteresis operation and outputting high and low levels to the switch action circuit.
The switching operation circuit outputs a first switching signal at a high level and outputs a second switching signal at a low level. The first switch signal can be a closing signal or an opening signal according to different relays, and if a normally open relay is selected, the first signal can be a closing signal; the second switch signal can be a closing signal or an opening signal according to different relays, and if a normally open relay is selected, the first signal can be an opening signal;
further, the overvoltage protection circuit is connected with the hysteresis comparison circuit, and the overvoltage protection circuit is used for limiting the output voltage of the hysteresis comparison circuit.
Fig. 2 is a schematic diagram of a hysteresis comparison circuit of a transmitter with a hysteresis switch, as shown in fig. 2, the hysteresis comparison circuit includes resistors R11, R12, R13, R15, R9, R10, an operational amplifier, a first power supply VDD1,
one end of the resistor R11 is connected with the signal conditioning circuit; the other end of the resistor R11, one end of the resistor R13, one end of the resistor R10 and the positive end of the operational amplifier are connected with each other;
the other end of the resistor R13 is connected with one end of a resistor R12; the other end of the resistor R10 is grounded; the negative end of the operational amplifier is connected with the reference circuit, and the output end of the operational amplifier is connected with one end of a resistor R15;
the other end of the resistor R12, the other end of the resistor R15 and one end of the resistor R9 are connected with each other and are connected with an overvoltage protection circuit; the other end of the resistor R9 is connected to a switching operation circuit.
Further, the reference circuit comprises a voltage stabilizing diode V4, a resistor R14, a second power supply VDD2,
the negative end of the voltage stabilizing diode V4 is connected with the negative end of the operational amplifier and one end of the resistor R14; the positive terminal of the voltage-stabilizing diode V4 is grounded, and the other terminal of the resistor R14 is connected with a second power supply VDD 2.
Further, the overvoltage protection circuit comprises a voltage stabilizing diode V1, the negative terminal of the voltage stabilizing diode V1 is connected with the resistor R12, the resistor R15 and the resistor R9, and the positive terminal of the voltage stabilizing diode V1 is grounded.
Further, the switch action circuit comprises a triode, a diode V2, a relay and a third power supply VDD 3. The base electrode of the triode is connected with the other end of the resistor R9, the collector electrode of the triode is connected with the relay, and the emitter electrode of the triode is grounded; the positive end of the diode V2 is connected with the collector of the triode, and the negative end of the diode V2 is connected with one end of the relay connected with the third power supply VDD 3. The first power supply VDD1, the second power supply connection VDD2, and the third power supply VDD3 are the same power supply.
The working principle of the invention is as follows: the pressure transmitter with the hysteresis switch mainly comprises: the voltage sensing core comprises a signal conditioning circuit, a hysteresis comparison circuit, a reference circuit, an overvoltage protection circuit and a switch action circuit, wherein the signal conditioning circuit can be composed of a digital adjusting circuit or an analog adjusting circuit and a temperature sensing element, the high-low temperature characteristic, the nonlinearity and the repeatability of the pressure sensing core are compensated through the signal conditioning circuit, and the mV level signal is converted into a 0V-5V voltage signal. In order to output the hysteresis operation signal, the hysteresis comparison circuit performs hysteresis comparison on the 0V-5V voltage signal output by the signal conditioning current and the 2.5V voltage reference circuit, and then outputs the hysteresis operation signal. The hysteresis action signal acts on the triode to control the relay to output a switch action signal.
The pressure transmitter with the hysteresis switch is designed based on a signal conditioning module and a hysteresis comparison circuit. Redesigning the original pressure switch, adding a hysteresis link, reducing fluctuation interference of the output of the transmitter, realizing high-precision and disturbance-resistant pressure hysteresis passive switch signals and outputting 0-5V analog voltage signals and switch signals, along with simple design, convenient operation and function integration.
Claims (8)
1. A pressure transmitter circuit with a hysteresis switch is characterized in that the pressure transmitter circuit comprises a signal conditioning circuit, a hysteresis comparison circuit, a reference circuit and a switch action circuit,
the signal conditioning circuit, the reference circuit and the switch action circuit are respectively and electrically connected with the hysteresis comparison circuit;
the signal conditioning circuit is used for conditioning the input first electric signal and outputting a second electric signal to the hysteresis comparison circuit;
the hysteresis comparison circuit is used for comparing the input second electric signal with the output voltage of the reference circuit, performing hysteresis operation and outputting high and low levels to the switch action circuit;
the switching operation circuit outputs a first switching signal at a high level and outputs a second switching signal at a low level.
2. The pressure transmitter circuit of claim 1, further comprising an overvoltage protection circuit coupled to the hysteresis comparison circuit, the overvoltage protection circuit configured to define an output voltage of the hysteresis comparison circuit.
3. The pressure transmitter circuit of claim 2 wherein the hysteresis comparison circuit comprises resistors R11, R12, R13, R15, R9, R10, an operational amplifier, a first power supply VDD1,
one end of the resistor R11 is connected with the signal conditioning circuit; the other end of the resistor R11, one end of the resistor R13, one end of the resistor R10 and the positive end of the operational amplifier are connected with each other;
the other end of the resistor R13 is connected with one end of a resistor R12; the other end of the resistor R10 is grounded; the negative end of the operational amplifier is connected with the reference circuit, and the output end of the operational amplifier is connected with one end of a resistor R15;
the other end of the resistor R12, the other end of the resistor R15 and one end of the resistor R9 are connected with each other and are connected with an overvoltage protection circuit; the other end of the resistor R9 is connected to a switching operation circuit.
4. The pressure transmitter circuit of claim 3 wherein the reference circuit comprises a zener diode V4, a resistor R14, a second power supply VDD2,
the negative end of the voltage stabilizing diode V4 is connected with the negative end of the operational amplifier and one end of the resistor R14; the positive terminal of the voltage-stabilizing diode V4 is grounded, and the other terminal of the resistor R14 is connected with a second power supply VDD 2.
5. The pressure transmitter circuit of claim 3, wherein the overvoltage protection circuit comprises a zener diode V1, a negative terminal of the zener diode V1 is connected to the resistor R12, the resistor R15 and the resistor R9, and a positive terminal of the zener diode V1 is connected to ground.
6. The pressure transmitter circuit of claim 3 wherein the switch action circuit comprises a transistor, a diode V2, a relay, a third power supply VDD3,
the base electrode of the triode is connected with the other end of the resistor R9, the collector electrode of the triode is connected with the relay, and the emitter electrode of the triode is grounded;
the positive end of the diode V2 is connected with the collector of the triode, and the negative end of the diode V2 is connected with one end of the relay connected with the third power supply VDD 3.
7. The pressure transmitter circuit of claim 1, wherein the second electrical signal is a voltage signal or a current signal.
8. The pressure transmitter circuit of claim 4 or 6, characterized in that the first power supply VDD1, the second power supply connection VDD2, and the third power supply VDD3 are the same power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911113482.0A CN110907072A (en) | 2019-11-14 | 2019-11-14 | Pressure transmitter circuit with hysteresis switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911113482.0A CN110907072A (en) | 2019-11-14 | 2019-11-14 | Pressure transmitter circuit with hysteresis switch |
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| Publication Number | Publication Date |
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| CN110907072A true CN110907072A (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911113482.0A Pending CN110907072A (en) | 2019-11-14 | 2019-11-14 | Pressure transmitter circuit with hysteresis switch |
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Citations (9)
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2019
- 2019-11-14 CN CN201911113482.0A patent/CN110907072A/en active Pending
Patent Citations (9)
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Application publication date: 20200324 |
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