CN215494628U - Temperature drift cancellation type pulse amplification interface circuit - Google Patents
Temperature drift cancellation type pulse amplification interface circuit Download PDFInfo
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- CN215494628U CN215494628U CN202121803701.0U CN202121803701U CN215494628U CN 215494628 U CN215494628 U CN 215494628U CN 202121803701 U CN202121803701 U CN 202121803701U CN 215494628 U CN215494628 U CN 215494628U
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Abstract
The utility model discloses a temperature drift cancellation type pulse amplification interface circuit, and relates to the technical field of monitoring equipment; the temperature compensation circuit is electrically connected with the amplification circuit, the control end of the controller is electrically connected with the control end of the power supply circuit, the first power supply is electrically connected with the controller, the second power supply is electrically connected with the input end of the power supply circuit, and the output end of the power supply circuit is electrically connected with the input end of the amplification circuit; the controller, the vortex oscillator, the amplifying circuit, the temperature compensation circuit, the power supply circuit, the first power supply, the second power supply and the like are used for timely knowing the state of the well cover of the heat supply pipe well and correspondingly knowing whether the well cover is stolen or not.
Description
Technical Field
The utility model relates to the technical field of monitoring equipment, in particular to a temperature drift cancellation type pulse amplification interface circuit.
Background
The internal environment of the urban underground heat supply pipe well is extremely severe, a heat supply pipe well operation parameter detection system needs to be specially designed, an electronic circuit of the system at least needs to work normally under the temperature environment of minus 25 ℃ to plus 100 ℃, because a monitoring system supplies power for a battery, the circuit needs to work in an intermittent working state, in order to detect whether the underground pipe well lid is stolen or not, the design invents a low-power consumption eddy current control type oscillator, a pulse amplification circuit of the oscillator needs to be connected with an ultra-low-power consumption singlechip, the output of the circuit needs to have three states, and in the case that the circuit enters the working state, the low-power consumption operation needs to be realized, when the well lid is intact, the singlechip system can detect low level, if the well lid is stolen, the eddy current control type oscillation circuit starts oscillation, a pulse string is output to the singlechip, and the singlechip enters a well lid theft alarm program, once the detection device is stolen or damaged and removed, the single chip microcomputer interface is suspended, high level can be detected, and another alarm program is executed.
Problems with the prior art and considerations:
in the abominable operational environment of heat supply pipe well, be high temperature and high humidity, how to solve and to know in time whether stolen technical problem of heat supply pipe well lid.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a temperature drift cancellation type pulse amplification interface circuit, and solving the problem that a well cover of a heat supply pipe well cannot be stolen timely.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: the utility model provides a temperature drift is to type pulse amplification interface circuit includes controller, vortex oscillator, amplifier circuit, temperature compensation circuit, power supply circuit, first power and second power, vortex oscillator, amplifier circuit and controller electricity in proper order are connected, and temperature compensation circuit is connected with amplifier circuit electricity, the control end and the control end electricity of power supply circuit of controller are connected, first power is connected with the controller electricity, the second power is connected with power supply circuit's input electricity, power supply circuit's output is connected with amplifier circuit's input electricity.
The further technical scheme is as follows: the eddy current oscillator is arranged on the well cover, the amplifying circuit is a pulse amplifying circuit, the power supply circuit is a linear voltage-stabilizing power supply circuit, and the linear voltage-stabilizing power supply circuit, the eddy current oscillator, the pulse amplifying circuit and the temperature compensating circuit form an induction plate.
The further technical scheme is as follows: the power supply circuit comprises a linear voltage regulator U1, wherein the input end of the linear voltage regulator U1 is the input end of the power supply circuit, the output end of the linear voltage regulator U1 is the output end of the power supply circuit, and the enable end of the linear voltage regulator U1 is the control end of the power supply circuit.
The further technical scheme is as follows: the controller is a single chip microcomputer U2, a first communication port of the single chip microcomputer U2 is electrically connected with the amplifying circuit, and a second communication port of the single chip microcomputer U2 is a control end of the controller.
The further technical scheme is as follows: the vortex oscillator is a vortex control oscillator U3, the amplifying circuit comprises a first triode Q1, a third capacitor C3, a fourth capacitor C4 and fifth to eighth resistors R5-R8, the temperature compensation circuit comprises a second triode Q2 and a fourth resistor R4, the output end of the vortex control oscillator U3 is connected with the base electrode of the first triode Q1 through the third capacitor C3, the base electrode of the first triode Q1 is sequentially connected with the GND through the fifth resistor R5 and the eighth resistor R8, the collector electrode of the first triode Q1 is connected with the GND through a seventh resistor R7, the emitter electrode of the first triode Q1 is connected with the base electrode of the second triode Q2 through the fourth resistor R4, the collector electrode of the second triode Q2 is connected with the collector electrode of the first triode Q1, the emitter electrode of the second triode Q2 is connected with the GND, the emitter electrode of the first triode Q6867 is the input end of the amplifying circuit, and the collector electrode of the first triode Q1 is connected with the collector electrode 6, the other end of the sixth resistor R6 is an output end of the temperature compensation circuit, and the fourth capacitor C4 is connected in parallel with the sixth resistor R6.
The further technical scheme is as follows: the first triode Q1 is a PNP type triode, and the second triode Q2 is an NPN triode.
The further technical scheme is as follows: the power supply circuit further comprises a connector, the connector is a four-pin connector J1, the controller is electrically connected with the amplifying circuit through the connector, and the controller is electrically connected with the power supply circuit through the connector.
The further technical scheme is as follows: the first power supply is a power supply which is independently provided for the controller, and the second power supply is a battery.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
the utility model provides a temperature drift is to type pulse amplification interface circuit includes controller, vortex oscillator, amplifier circuit, temperature compensation circuit, power supply circuit, first power and second power, vortex oscillator, amplifier circuit and controller electricity in proper order are connected, and temperature compensation circuit is connected with amplifier circuit electricity, the control end and the control end electricity of power supply circuit of controller are connected, first power is connected with the controller electricity, the second power is connected with power supply circuit's input electricity, power supply circuit's output is connected with amplifier circuit's input electricity. The controller, the vortex oscillator, the amplifying circuit, the temperature compensation circuit, the power supply circuit, the first power supply, the second power supply and the like are used for timely knowing the state of the well cover of the heat supply pipe well and correspondingly knowing whether the well cover is stolen or not.
See detailed description of the preferred embodiments.
Drawings
FIG. 1 is a circuit schematic of the power supply circuit of the present invention;
FIG. 2 is a circuit schematic of the controller and connector of the present invention;
FIG. 3 is a schematic circuit diagram of an eddy current oscillator, an amplifying circuit and a temperature compensating circuit according to the present invention;
fig. 4 is a power distribution diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited to the specific embodiments disclosed below.
As shown in fig. 1 to 3, the present invention discloses a temperature drift cancellation type pulse amplification interface circuit, which includes a controller, a connector, an eddy current oscillator, an amplification circuit, a temperature compensation circuit, a power supply circuit, a first power supply and a second power supply, wherein the second power supply is a battery, the first triode Q1 is a PNP type triode, the second triode Q2 is an NPN type triode, the eddy current oscillator, the amplification circuit and the controller are electrically connected in sequence, the temperature compensation circuit is electrically connected with the amplification circuit, a control end of the controller is electrically connected with a control end of the power supply circuit, the second power supply is electrically connected with an input end of the power supply circuit, and an output end of the power supply circuit is electrically connected with an input end of the amplification circuit.
The eddy current oscillator is installed on the well cover, the amplifying circuit is a pulse amplifying circuit, the power supply circuit is a linear voltage-stabilizing LDO power supply circuit, and the linear voltage-stabilizing LDO power supply circuit, the eddy current oscillator, the pulse amplifying circuit and the temperature compensating circuit form an induction plate.
As shown in fig. 1, the power supply circuit includes a linear regulator U1, a second resistor R2, a third resistor R3, a first capacitor C1, and a second capacitor C2, the linear regulator U1 is a low dropout regulator LDO, an input terminal VIN of the linear regulator U1 is an input terminal of the power supply circuit, an output terminal OUT of the linear regulator U1 is an output terminal of the power supply circuit, an enable terminal CE of the linear regulator U1 is a control terminal of the power supply circuit, and the electrical connection relationship of other components is not described in detail with reference to the drawings.
As shown in fig. 2, the controller is a single chip microcomputer U2, the controller is an upper computer MCU, the connector is a four-pin connector J1, the first resistor R1 is a pull-up resistor, the first power supply is a power supply separately provided for the upper computer, the first power supply is electrically connected with the controller, the first communication port GPIO1 of the single chip microcomputer U2 is connected with the positive electrode of the first power supply through the first resistor R1, the first communication port GPIO1 of the single chip microcomputer U2 is electrically connected with the amplifying circuit through the connector, the second communication port GPIO2 of the single chip microcomputer U2 is a control end of the controller, the control end of the controller is connected with the electrical control end of the power supply circuit through the connector, and other electrical connection relationships are not described in detail in reference to the drawings.
As shown in fig. 3, the vortex oscillator is a vortex controlled oscillator U3, the amplifying circuit includes a first triode Q1, a third capacitor C3, a fourth capacitor C4 and fifth to eighth resistors R5 to R8, the temperature compensation circuit includes a second triode Q2 and a fourth resistor R4, the output terminal of the vortex controlled oscillator U3 is connected to the base of the first triode Q1 through the third capacitor C3, the base of the first triode Q1 is connected to GND through a fifth resistor R5 and an eighth resistor R8 in turn, the collector of the first triode Q1 is connected to GND through a seventh resistor R7, the emitter of the first triode Q1 is connected to the base of the second triode Q2 through a fourth resistor R4, the collector of the second triode Q2 is connected to the collector of the first triode Q1, the emitter of the second triode Q2 is connected to GND, the emitter of the first triode Q1 is connected to the input terminal of the amplifying circuit, and the collector of the sixth resistor R6, the other end of the sixth resistor R6 is an output end of the temperature compensation circuit, and the fourth capacitor C4 is connected in parallel with the sixth resistor R6.
Technical contribution of the present application:
the whole circuit consists of an eddy current control oscillator and a pulse amplifying and outputting circuit. In order to adapt to a very large environment temperature change range, each stage circuit must be designed with a temperature compensation circuit, in order to ensure low power consumption and stable working state of a single chip microcomputer interface, an output stage of the circuit works in an amplification initial region and is in a near-cutoff state, in order to reduce the influence of large-range temperature change on the state of the output circuit as far as possible, and in order to obtain stable low-level output at the single chip microcomputer interface, the circuit is designed with special temperature drift compensation on the output stage.
Description of the technical solution:
1. the system comprises the following components in part by weight:
as shown in fig. 4, the system is composed of an induction plate and an upper machine, the induction plate comprises an LDO power supply circuit, an eddy current control oscillator, a pulse amplification circuit and a temperature compensation circuit, the eddy current control oscillator adopts a capacitance three-point self-excited oscillation circuit, an inductance tank circuit is formed by winding wires of a pot-shaped magnetic core, a magnetic cover plate of the pot-shaped magnetic core is removed, the magnetic field of the pot-shaped magnetic core can be in an open circuit state, an iron manhole cover to be detected is positioned above the pot-shaped magnetic core, a closed magnetic field can be formed by the manhole cover, when no manhole cover is arranged above the pot-shaped magnetic core, the oscillation circuit starts oscillation, and a pulse string square wave is formed by the amplification circuit. When the upper well cover is closed, the magnetic field forms eddy current in the well cover, and the oscillation circuit stops oscillation due to the increase of the loss of the magnetic field. The signals changed above are all sent to the interface of the master control singlechip through the low-power pulse amplification and output circuit. The temperature compensation circuit is a temperature drift cancellation interface circuit in the figure, the controller is an MCU in the figure, and the power supply circuit is an LDO in the figure.
2. Inductor LDO supply circuit:
as shown in fig. 2, VIN is supplied by 3.6V provided by a battery, U1 is a low dropout high-precision LDO, and output 3.3V is supplied by an eddy current controlled oscillator, a pulse amplification circuit and a temperature compensation circuit. In order to further reduce POWER consumption, the induction board circuit can work in an intermittent state, the single chip microcomputer controls an enabling end of the circuit, namely a network POWER _ ON through an IO (input output), a CE (chip area) pin of U1 is controlled, when the IO of the single chip microcomputer outputs a low level, U1 is powered off, the circuit enters a dormant state, and static POWER consumption at the moment is less than 0.2 uA. When the single chip microcomputer IO outputs a high level, the U1 outputs a 3.3V power supply, and the induction board circuit starts to work. The power consumption of the whole circuit can be controlled by controlling the proportion of high and low levels of the enabling end of the circuit, and if the circuit does not work for most of time, the power consumption of the circuit can be greatly reduced.
3. Host computer and connector interface circuit:
as shown in fig. 2, U2 is an MCU, V3.3_1 is a power supply provided by the upper computer alone, the MCU needs to provide 2 IO ports, and power supply, control, and signal reception to the sensing board are realized through the connector J1. The GPIO2, namely a POWER ON port, is an enabling end and is used for controlling the POWER supply of the eddy current control oscillator and the pulse amplification circuit board and controlling the ON and off of the POWER supply (U1) of the induction board, so that the POWER consumption can be greatly saved. Another GPIO1, i.e. OUTPUT port, is pulled up to 3.3V on the upper computer side using a resistor for receiving the square pulses OUTPUT by the sensing board. The well lid state is judged by singlechip MCU, and GPIO1 is total three types of input signals on the OUTPUT mouth: 1) the pulse train signal is generated by the oscillation starting of the vortex control oscillator and indicates that the well lid is lost; 2) the low level is generated by stopping oscillation of the vortex control oscillator and indicates that the well cover is still in place; 3) and the high level indicates that the port line connected with the singlechip is disconnected or the sensor is lost.
4. A pulse amplification circuit:
as shown in fig. 3, when the oscillator is stopped, the PNP transistor Q1 is in the amplification start region, and is in a near-off state, outputting a low level. When the oscillator starts oscillation, Q1 switches back and forth between the amplification region and the cut-off region to output a pulse train. R6 and C4 are used for edge shaping of the output waveform.
5. Temperature drift cancellation circuit:
as shown in fig. 3, the temperature compensation circuit, i.e., the temperature drift cancellation circuit, increases the collector current of the transistor Q1 when the temperature rises, which increases the voltage drop across the resistor R7, and raises the output low-level voltage, which affects the stability of the output. Therefore, an NPN triode Q2 is added to form a dual with Q1, when the temperature rises, the leakage current of Q2 also increases along with the increase of the temperature, the increased leakage current of Q1 is bypassed, the level of a resistor R7 is not increased basically, and the stability of outputting low level at different temperatures is ensured.
After the application runs secretly for a period of time, the feedback of field technicians has the advantages that:
the device can adapt to severe environment of a heat supply pipe well at minus 25 ℃ to plus 100 ℃, the output stage adopts the temperature drift compensation design, the whole device realizes the ultra-low power consumption design, has the well lid theft alarm function, and also has the anti-theft alarm function of the device.
The starting vibration and the stopping vibration of the oscillator are controlled by the eddy current formed in the iron well cover by the magnetic tank winding inductive magnetic field. The temperature drift compensation of the output waveform is realized through the temperature compensation circuit, so that the circuit can output normal waveforms in severe environments of-25 ℃ to +100 ℃ of a heat supply pipe well.
Claims (8)
1. The utility model provides a temperature drift is to type pulse amplification interface circuit which characterized in that: including controller, vortex oscillator, amplifier circuit, temperature compensation circuit, power supply circuit, first power and second power, vortex oscillator, amplifier circuit and controller electricity in proper order are connected, and temperature compensation circuit is connected with amplifier circuit electricity, the control end of controller is connected with power supply circuit's control end electricity, first power is connected with the controller electricity, the second power is connected with power supply circuit's input electricity, power supply circuit's output is connected with amplifier circuit's input electricity.
2. The temperature drift cancellation type pulse amplification interface circuit according to claim 1, characterized in that: the eddy current oscillator is arranged on the well cover, the amplifying circuit is a pulse amplifying circuit, the power supply circuit is a linear voltage-stabilizing power supply circuit, and the linear voltage-stabilizing power supply circuit, the eddy current oscillator, the pulse amplifying circuit and the temperature compensating circuit form an induction plate.
3. The temperature drift cancellation type pulse amplification interface circuit according to claim 1, characterized in that: the power supply circuit comprises a linear voltage regulator U1, wherein the input end of the linear voltage regulator U1 is the input end of the power supply circuit, the output end of the linear voltage regulator U1 is the output end of the power supply circuit, and the enable end of the linear voltage regulator U1 is the control end of the power supply circuit.
4. The temperature drift cancellation type pulse amplification interface circuit according to claim 1, characterized in that: the controller is a single chip microcomputer U2, a first communication port of the single chip microcomputer U2 is electrically connected with the amplifying circuit, and a second communication port of the single chip microcomputer U2 is a control end of the controller.
5. The temperature drift cancellation type pulse amplification interface circuit according to claim 1, characterized in that: the vortex oscillator is a vortex control oscillator U3, the amplifying circuit comprises a first triode Q1, a third capacitor C3, a fourth capacitor C4 and fifth to eighth resistors R5-R8, the temperature compensation circuit comprises a second triode Q2 and a fourth resistor R4, the output end of the vortex control oscillator U3 is connected with the base electrode of the first triode Q1 through the third capacitor C3, the base electrode of the first triode Q1 is sequentially connected with the GND through the fifth resistor R5 and the eighth resistor R8, the collector electrode of the first triode Q1 is connected with the GND through a seventh resistor R7, the emitter electrode of the first triode Q1 is connected with the base electrode of the second triode Q2 through the fourth resistor R4, the collector electrode of the second triode Q2 is connected with the collector electrode of the first triode Q1, the emitter electrode of the second triode Q2 is connected with the GND, the emitter electrode of the first triode Q6867 is the input end of the amplifying circuit, and the collector electrode of the first triode Q1 is connected with the collector electrode 6, the other end of the sixth resistor R6 is an output end of the temperature compensation circuit, and the fourth capacitor C4 is connected in parallel with the sixth resistor R6.
6. The temperature-drift-cancellation type pulse amplification interface circuit according to claim 5, characterized in that: the first triode Q1 is a PNP type triode, and the second triode Q2 is an NPN triode.
7. The temperature drift cancellation type pulse amplification interface circuit according to claim 1, characterized in that: the power supply circuit further comprises a connector, the connector is a four-pin connector J1, the controller is electrically connected with the amplifying circuit through the connector, and the controller is electrically connected with the power supply circuit through the connector.
8. The temperature drift cancellation type pulse amplification interface circuit according to claim 1, characterized in that: the first power supply is a power supply which is independently provided for the controller, and the second power supply is a battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121803701.0U CN215494628U (en) | 2021-08-04 | 2021-08-04 | Temperature drift cancellation type pulse amplification interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121803701.0U CN215494628U (en) | 2021-08-04 | 2021-08-04 | Temperature drift cancellation type pulse amplification interface circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215494628U true CN215494628U (en) | 2022-01-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121803701.0U Active CN215494628U (en) | 2021-08-04 | 2021-08-04 | Temperature drift cancellation type pulse amplification interface circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215494628U (en) |
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2021
- 2021-08-04 CN CN202121803701.0U patent/CN215494628U/en active Active
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