CN105974958A - High-precision signal acquisition and processing system for digital temperature controller - Google Patents

High-precision signal acquisition and processing system for digital temperature controller Download PDF

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Publication number
CN105974958A
CN105974958A CN201610452017.XA CN201610452017A CN105974958A CN 105974958 A CN105974958 A CN 105974958A CN 201610452017 A CN201610452017 A CN 201610452017A CN 105974958 A CN105974958 A CN 105974958A
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CN
China
Prior art keywords
pole
amplifier
outfan
resistance
electric capacity
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Pending
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CN201610452017.XA
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Chinese (zh)
Inventor
不公告发明人
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Chengdu Presster Energy Saving Technology Co Ltd
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Chengdu Presster Energy Saving Technology Co Ltd
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Priority to CN201610452017.XA priority Critical patent/CN105974958A/en
Publication of CN105974958A publication Critical patent/CN105974958A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00Control of temperature
    • G05D23/19Control of temperature characterised by the use of electric means
    • G05D23/1917Control of temperature characterised by the use of electric means using digital means
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H11/00Networks using active elements
    • H03H11/02Multiple-port networks
    • H03H11/04Frequency selective two-port networks
    • H03H11/12Frequency selective two-port networks using amplifiers with feedback
    • H03H11/1217Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers

Abstract

The invention discloses a high-precision signal acquisition and processing system for a digital temperature controller. The high-precision signal acquisition and processing system is characterized in that the system is mainly composed of a temperature sensor U, a linear filter circuit which is connected with the temperature sensor U, a resistor R1 of which one end is connected with the linear filter circuit and the other end is grounded through a potentiometer R2, a two-stage amplifying circuit which is connected with the linear filter circuit, etc. The high-precision signal acquisition and processing system can amplify a weak signal which is output by the temperature sensor and keeps consistency between the waveform of an output signal and the waveform of the input signal. The high-precision signal acquisition and processing system is also provided with a stable static working point, thereby preventing distortion of the output signal, ensuring high fidelity of the output signal, improving temperature detecting precision of the digital temperature controller and realizing higher accuracy in temperature controlling by the digital temperature controller. The high-precision signal acquisition and processing system can filter interference signals in the signals and prevents influence of the interference signals, thereby improving temperature detecting precision of the digital temperature controller.

Description

A kind of purpose digital temperature controller high-precision signal acquisition processing system
Technical field
The present invention relates to domain of control temperature, specifically refer to a kind of purpose digital temperature controller high-precision signal and gather Processing system.
Background technology
Along with the development of science and technology, purpose digital temperature controller has been widely used in the middle of daily commercial production, its For the temperature of production equipment, environment being detected and controlling, to improve production efficiency and product quality. But, the signal processing system that existing purpose digital temperature controller is used easily makes signal when to signal processing Waveform occur distortion, cause purpose digital temperature controller not accurate enough to temperature detection, had a strong impact on it to temperature The control accuracy of degree.
Summary of the invention
The signal processing system that it is an object of the invention to overcome existing purpose digital temperature controller to be used easily is subject to Defect to outside electromagnetic interference, it is provided that a kind of purpose digital temperature controller high-precision signal acquisition processing system.
The purpose of the present invention is achieved through the following technical solutions: a kind of purpose digital temperature controller high-precision signal is adopted Collection processing system, mainly by temperature sensor U, the linear filtering circuit being connected with temperature sensor U, One end is connected with linear filtering circuit, other end resistance R1 of ground connection after potentiometer R2, with linear filter The two-stage amplifying circuit that wave circuit is connected, the feedback circuit being connected with two-stage amplifying circuit respectively and voltage Follow circuit, the current potential that a termination power, other end ground connection, control end are then connected with two-stage amplifying circuit Device R3, and the gate bias circuit composition being connected with two-stage amplifying circuit and voltage follower circuit respectively; The end junction point then with resistance R1 and potentiometer R2 that controls of described potentiometer R2 is connected.
Further, described gate bias circuit is imitated with field by field effect transistor MOS, audion VT4, negative pole Should the grid of pipe MOS be connected, positive pole is as the electric capacity C10 of the input of this gate bias circuit, positive pole Be connected with the source electrode of field effect transistor MOS, electric capacity C11, the P pole of negative pole ground connection after resistance R19 and field The grid of effect pipe MOS is connected, N pole negative pole with electric capacity C11 after resistance R17 is connected two Pole pipe D6, the electric capacity C9 that minus earth, positive pole are connected with the N pole of diode D6 after resistance R16, One end is connected with the drain electrode of field effect transistor MOS, resistance R18, the P pole of other end ground connection and field effect transistor The diode D7 that the source electrode of MOS is connected, N pole is connected with the base stage of audion VT4, positive pole and two The N pole of pole pipe D7 is connected, the electric capacity C13 of minus earth, the emitter stage phase of one end and audion VT4 The leakage of the resistance R21 that connection, the other end are connected with the negative pole of electric capacity C13, positive pole and field effect transistor MOS Pole is connected, negative pole as the electric capacity C12 of the outfan of this gate bias circuit, positive pole is with electric capacity C12's The electric capacity C14 that negative pole is connected, negative pole is connected with the colelctor electrode of audion VT4, and with electric capacity C14 The resistance R20 composition being in parallel;The input of described gate bias circuit is connected with two-stage amplifying circuit, Its outfan is then connected with voltage follower circuit.
Described linear filtering electricity routing amplifier P4, amplifier P5, audion VT3, negative pole is through resistance R11 Afterwards the positive pole with amplifier P4 be connected, positive pole as the electric capacity C7 of the input of this linear filtering circuit, Resistance R12, the P pole being serially connected between the negative pole of electric capacity C7 and the negative pole of amplifier P4 is negative with electric capacity C7's Pole is connected, the diode D3 of N pole ground connection, is serially connected in the N pole of diode D3 and the negative of amplifier P5 Resistance R13 between pole, positive pole is connected with the N pole of diode D3, the output of negative pole and amplifier P5 The electric capacity C8 that is connected of end, resistance R14, the P pole being serially connected between positive pole and the outfan of amplifier P4 with The emitter stage of audion VT3 is connected, N pole as the diode D5 of the outfan of this linear filtering circuit, N pole is connected with the emitter stage of audion VT3, P pole connects while being connected with the outfan of amplifier P5 The diode D4 on ground, and it is serially connected in the electricity between the colelctor electrode of audion VT3 and the N pole of diode D5 Resistance R15 composition;The positive pole of described amplifier P5 is connected with its outfan;The base of described audion VT3 Pole is connected with the outfan of amplifier P4;The input of described linear filtering circuit and temperature sensor U phase Connection, its outfan the most sequentially ground connection after resistance R1 and potentiometer R2;Described two-stage amplifying circuit then with The outfan of linear filtering circuit is connected.
Described two-stage amplifying circuit is by amplifier P1, audion VT1, amplifier P3, positive pole and amplifier The positive pole of P1 is connected, negative pole is connected with the outfan of amplifier P1 electric capacity C1, P pole and amplifier The diode D1 that the outfan of P1 is connected, N pole base stage with audion VT1 after electric capacity C3 is connected, It is serially connected in the resistance R7 between positive pole and the outfan of amplifier P3, and the positive pole of one end and amplifier P3 Be connected, the other end then with potentiometer R3 control end be connected resistance R5 composition;Described amplifier P1 Negative pole be connected with the outfan of linear filtering circuit, its outfan is then connected with feedback circuit;Described The emitter stage of audion VT1 is connected with feedback circuit, its colelctor electrode then negative pole with amplifier P3 is connected; The outfan of described amplifier P3 is connected with feedback circuit and voltage follower circuit respectively;Described gate bias The input of circuit then outfan with amplifier P3 is connected.
Described feedback circuit is by amplifier P2, and positive pole is connected with the outfan of amplifier P1, negative pole and amplification The electric capacity C2 that the outfan of device P2 is connected, is serially connected in the resistance between outfan and the negative pole of amplifier P2 R4, the resistance R6 being serially connected between the positive pole of amplifier P2 and the emitter stage of audion VT1, and positive pole Be connected with the negative pole of amplifier P2, electricity that negative pole outfan with amplifier P3 after resistance R8 is connected Hold C4 composition;The minus earth of described electric capacity C4.
Described voltage follower circuit by audion VT2, diode D2, the N pole phase of one end and diode D2 Connect, the other end as the resistance R10 of the outfan of this voltage follower circuit, the N of positive pole and diode D2 The electric capacity C6 that pole is connected, negative pole then colelctor electrode with audion VT2 is connected, positive pole and gate bias electricity The electric capacity C5 that the outfan on road is connected, negative pole is connected with the base stage of audion VT2, and one end and three The emitter stage of pole pipe VT2 is connected, the resistance R9 of other end ground connection composition.
Described temperature sensor U is AD590 current mode integrated temperature sensor.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) present invention can to temperature sensor output small-signal be amplified, and make output signal with The waveform of input signal keeps consistent, it is ensured that the fidelity of output signal, such that it is able to improve digital temperature The temperature detecting precision of control device, enables purpose digital temperature controller to be controlled temperature more accurately.
(2) present invention uses AD590 current mode integrated temperature sensor, and its capacity of resisting disturbance is strong, Ke Yiti The stability of the high present invention.
(3) the interference signal in signal can be filtered by the present invention, eliminates the impact that interference signal brings, Such that it is able to improve the temperature detecting precision of purpose digital temperature controller.
(4) present invention has stable quiescent point, so that it is guaranteed that the signal of output does not haves distortion now As.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the linear filtering circuit of the present invention.
Fig. 3 is the structure chart of the gate bias circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not It is limited to this.
Embodiment
As it is shown in figure 1, the present invention is mainly by temperature sensor U, linear with what temperature sensor U was connected Filter circuit, one end is connected with linear filtering circuit, other end resistance R1 of ground connection after potentiometer R2, The two-stage amplifying circuit being connected with linear filtering circuit, the feedback being connected with two-stage amplifying circuit respectively electricity Road and voltage follower circuit, a termination power, other end ground connection, control end are then connected with two-stage amplifying circuit The potentiometer R3 connect, and the gate bias electricity being connected with two-stage amplifying circuit and voltage follower circuit respectively Road forms;The end junction point then with resistance R1 and potentiometer R2 that controls of described potentiometer R2 is connected. In order to preferably implement the present invention, this temperature sensor U preferred AD590 current mode integrated temperature sensor comes Realizing, this temperature sensor capacity of resisting disturbance is strong, can improve the stability of the present invention.
Wherein, two-stage amplifying circuit is by amplifier P1, audion VT1, amplifier P3, electric capacity C1, electricity Hold C3, potentiometer R3, resistance R5, resistance R6 and resistance R7 composition.
During connection, the positive pole of electric capacity C1 is connected with the positive pole of amplifier P1, its negative pole and amplifier P1 Outfan is connected.The P pole of diode D1 is connected with the outfan of amplifier P1, its N pole is through electric capacity After C3, the base stage with audion VT1 is connected.Resistance R7 is serially connected in positive pole and the outfan of amplifier P3 Between.One end of resistance R5 is connected with the positive pole of amplifier P3, its other end then with the control of potentiometer R3 End processed is connected.
Meanwhile, the negative pole of described amplifier P1 be connected with the outfan of linear filtering circuit, its outfan then It is connected with feedback circuit.The emitter stage of described audion VT1 is connected with feedback circuit, its colelctor electrode then It is connected with the negative pole of amplifier P3.The outfan of described amplifier P3 respectively with feedback circuit and voltage with It is connected with circuit.The input of described gate bias circuit then outfan with amplifier P3 is connected.
It addition, described feedback circuit is by amplifier P2, resistance R4, resistance R6, resistance R8, electric capacity C2 And electric capacity C4 composition.The positive pole of this electric capacity C2 is connected with the outfan of amplifier P1, its negative pole with put The outfan of big device P2 is connected.Resistance R4 is serially connected between outfan and the negative pole of amplifier P2.Resistance R6 is serially connected between the positive pole of amplifier P2 and the emitter stage of audion VT1.The positive pole of electric capacity C4 with put The negative pole of big device P2 is connected, its negative pole outfan with amplifier P3 after resistance R8 is connected.Described The minus earth of electric capacity C4.
This voltage follower circuit is by audion VT2, diode D2, resistance R9, resistance R10, electric capacity C5 And electric capacity C6 composition.
During connection, one end of resistance R10 is connected with the N pole of diode D2, its other end is as this electricity Press the outfan of follow circuit and connect external control system.The N pole phase of the positive pole of electric capacity C6 and diode D2 Connect, its negative pole then colelctor electrode with audion VT2 is connected.The positive pole of electric capacity C5 and gate bias electricity Road is connected, negative pole is connected with the base stage of audion VT2.One end of resistance R9 is with audion VT2's Emitter stage is connected, its other end ground connection.
As in figure 2 it is shown, this linear filtering electricity routing amplifier P4, amplifier P5, audion VT3, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, electric capacity C7, electric capacity C8, diode D3, diode D4 and diode D5 form.
The negative pole of this electric capacity C7 positive pole with amplifier P4 after resistance R11 is connected, its positive pole is as this The input of linear filtering circuit is also connected with temperature sensor U.Resistance R12 is serially connected in electric capacity C7's Between the negative pole of negative pole and amplifier P4.The P pole of diode D3 is connected with the negative pole of electric capacity C7, its N Pole ground connection.Resistance R13 is serially connected between the N pole of diode D3 and the negative pole of amplifier P5.Electric capacity C8 Positive pole be connected with the N pole of diode D3, its negative pole is connected with the outfan of amplifier P5.Resistance R14 is serially connected between positive pole and the outfan of amplifier P4.The P pole of diode D5 is with audion VT3's Emitter stage is connected, its N pole is as the outfan of this linear filtering circuit and sequentially through resistance R1 and potentiometer Ground connection after R2.The N pole of diode D4 is connected with the emitter stage of audion VT3, its P pole and amplifier The outfan of P5 be connected while ground connection.Resistance R15 is serially connected in colelctor electrode and the diode of audion VT3 Between the N pole of D5.The positive pole of this described amplifier P5 is connected with its outfan.Described audion VT3 Base stage be connected with the outfan of amplifier P4.The outfan of described linear filtering circuit also with amplifier P1 Negative pole be connected.
As it is shown on figure 3, described gate bias circuit is by field effect transistor MOS, audion VT4, resistance R16, Resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, electric capacity C9, electric capacity C10, Electric capacity C11, electric capacity C12, electric capacity C13, electric capacity C14, diode D6 and diode D7 form.
During connection, the negative pole of electric capacity C10 is connected with the grid of field effect transistor MOS, its positive pole is as these grid The input of pole biasing circuit is also connected with the outfan of amplifier P3.The positive pole of electric capacity C11 and field effect The source electrode of pipe MOS is connected, its negative pole ground connection after resistance R19.The P pole of diode D6 and field effect The grid of pipe MOS is connected, its N pole negative pole with electric capacity C11 after resistance R17 is connected.Electric capacity The minus earth of C9, its positive pole N pole with diode D6 after resistance R16 is connected.Resistance R18's One end is connected with the drain electrode of field effect transistor MOS, its other end ground connection.The P pole of diode D7 is imitated with field Should the source electrode of pipe MOS be connected, its N pole is connected with the base stage of audion VT4.Electric capacity C13 is just Pole is connected with the N pole of diode D7, its minus earth.One end of resistance R21 is with audion VT4's Emitter stage is connected, its other end is connected with the negative pole of electric capacity C13.The positive pole of electric capacity C12 and field effect The drain electrode of pipe MOS is connected, its negative pole is as the outfan with electric capacity C5 just of this gate bias circuit Pole is connected.The positive pole of electric capacity C14 is connected with the negative pole of electric capacity C12, its negative pole and audion VT4 Colelctor electrode is connected.Resistance R20 is in parallel with electric capacity C14.
The small-signal of temperature sensor output can be amplified by the present invention, and makes output signal and input The waveform of signal keeps consistent, and the present invention also has stable quiescent point, so that the signal of output is not There will be distortion phenomenon, it is ensured that the fidelity of output signal, such that it is able to improve the temperature of purpose digital temperature controller Degree accuracy of detection, enables purpose digital temperature controller to be controlled temperature more accurately.The present invention can be to letter Interference signal in number filters, and eliminates the impact that interference signal brings, such that it is able to improve digital temperature The temperature detecting precision of control device.
As it has been described above, just can well realize the present invention.

Claims (7)

1. a purpose digital temperature controller high-precision signal acquisition processing system, it is characterised in that main by temperature Degree sensor U, the linear filtering circuit being connected with temperature sensor U, one end and linear filtering circuit phase Connection, other end resistance R1 of ground connection after potentiometer R2, the two-stage being connected with linear filtering circuit is put Big circuit, the feedback circuit being connected with two-stage amplifying circuit respectively and voltage follower circuit, a termination power, The potentiometer R3 that other end ground connection, control end are then connected with two-stage amplifying circuit, and put with two-stage respectively The gate bias circuit composition that big circuit is connected with voltage follower circuit;The control end of described potentiometer R2 is then It is connected with the junction point of resistance R1 and potentiometer R2.
A kind of purpose digital temperature controller high-precision signal acquisition processing system the most according to claim 1, It is characterized in that, described gate bias circuit is by field effect transistor MOS, audion VT4, negative pole and field effect The grid of pipe MOS is connected, positive pole as the electric capacity C10 of the input of this gate bias circuit, positive pole with The source electrode of field effect transistor MOS is connected, negative pole electric capacity C11, P pole of ground connection after resistance R19 is imitated with field Should the grid of pipe MOS is connected, N pole negative pole with electric capacity C11 after resistance R17 is connected two poles Pipe D6, the electric capacity C9 that minus earth, positive pole are connected with the N pole of diode D6 after resistance R16, One end is connected with the drain electrode of field effect transistor MOS, resistance R18, the P pole of other end ground connection and field effect transistor The diode D7 that the source electrode of MOS is connected, N pole is connected with the base stage of audion VT4, positive pole and two The N pole of pole pipe D7 is connected, the electric capacity C13 of minus earth, the emitter stage phase of one end and audion VT4 The leakage of the resistance R21 that connection, the other end are connected with the negative pole of electric capacity C13, positive pole and field effect transistor MOS Pole is connected, negative pole as the electric capacity C12 of the outfan of this gate bias circuit, positive pole is with electric capacity C12's The electric capacity C14 that negative pole is connected, negative pole is connected with the colelctor electrode of audion VT4, and with electric capacity C14 The resistance R20 composition being in parallel;The input of described gate bias circuit is connected with two-stage amplifying circuit, Its outfan is then connected with voltage follower circuit.
A kind of purpose digital temperature controller high-precision signal acquisition processing system the most according to claim 2, It is characterized in that, described linear filtering electricity routing amplifier P4, amplifier P5, audion VT3, negative pole warp After resistance R11, the positive pole with amplifier P4 is connected, positive pole is as the electricity of the input of this linear filtering circuit Hold C7, resistance R12, the P pole being serially connected between the negative pole of electric capacity C7 and the negative pole of amplifier P4 and electric capacity The negative pole of C7 is connected, the diode D3 of N pole ground connection, is serially connected in N pole and the amplifier of diode D3 Resistance R13 between the negative pole of P5, positive pole is connected with the N pole of diode D3, negative pole and amplifier P5 The electric capacity C8 that is connected of outfan, be serially connected in the resistance R14 between positive pole and the outfan of amplifier P4, P pole is connected with the emitter stage of audion VT3, N pole is as two poles of the outfan of this linear filtering circuit Pipe D5, N pole is connected with the emitter stage of audion VT3, P pole is connected with the outfan of amplifier P5 While the diode D4 of ground connection, and be serially connected in the colelctor electrode of audion VT3 and the N pole of diode D5 Between resistance R15 composition;The positive pole of described amplifier P5 is connected with its outfan;Described audion The base stage of VT3 is connected with the outfan of amplifier P4;The input of described linear filtering circuit passes with temperature Sensor U is connected, its outfan the most sequentially ground connection after resistance R1 and potentiometer R2;Described two-stage is amplified Circuit then outfan with linear filtering circuit is connected.
A kind of purpose digital temperature controller high-precision signal acquisition processing system the most according to claim 3, It is characterized in that, described two-stage amplifying circuit by amplifier P1, audion VT1, amplifier P3, positive pole with Electric capacity C1, the P pole that the positive pole of amplifier P1 is connected, negative pole is connected with the outfan of amplifier P1 with The outfan of amplifier P1 is connected, N pole base stage with audion VT1 after electric capacity C3 is connected two Pole pipe D1, is serially connected in the resistance R7 between positive pole and the outfan of amplifier P3, and one end and amplifier The resistance R5 composition that the positive pole of P3 is connected, the other end is then connected with the control end of potentiometer R3;Described The negative pole of amplifier P1 is connected with the outfan of linear filtering circuit, its outfan is then connected with feedback circuit Connect;The emitter stage of described audion VT1 is connected with feedback circuit, its colelctor electrode then negative with amplifier P3 Pole is connected;The outfan of described amplifier P3 is connected with feedback circuit and voltage follower circuit respectively;Institute State the input of the gate bias circuit outfan then with amplifier P3 to be connected.
A kind of purpose digital temperature controller high-precision signal acquisition processing system the most according to claim 4, It is characterized in that, described feedback circuit is by amplifier P2, and positive pole is connected with the outfan of amplifier P1, bears The electric capacity C2 that pole is connected with the outfan of amplifier P2, be serially connected in the outfan of amplifier P2 and negative pole it Between resistance R4, the resistance R6 being serially connected between the positive pole of amplifier P2 and the emitter stage of audion VT1, And positive pole is connected with the negative pole of amplifier P2, negative pole after resistance R8 with the outfan phase of amplifier P3 The electric capacity C4 composition connected;The minus earth of described electric capacity C4.
A kind of purpose digital temperature controller high-precision signal acquisition processing system the most according to claim 5, It is characterized in that, described voltage follower circuit is by audion VT2, diode D2, one end and diode D2 N pole be connected, the other end is as the resistance R10 of the outfan of this voltage follower circuit, positive pole and two poles The electric capacity C6 that the N pole of pipe D2 is connected, negative pole then colelctor electrode with audion VT2 is connected, positive pole with The electric capacity C5 that the outfan of gate bias circuit is connected, negative pole is connected with the base stage of audion VT2, with And one end is connected with the emitter stage of audion VT2, the resistance R9 of other end ground connection composition.
A kind of purpose digital temperature controller high-precision signal acquisition processing system the most according to claim 6, It is characterized in that, described temperature sensor U is AD590 current mode integrated temperature sensor.
CN201610452017.XA 2016-06-21 2016-06-21 High-precision signal acquisition and processing system for digital temperature controller Pending CN105974958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610452017.XA CN105974958A (en) 2016-06-21 2016-06-21 High-precision signal acquisition and processing system for digital temperature controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610452017.XA CN105974958A (en) 2016-06-21 2016-06-21 High-precision signal acquisition and processing system for digital temperature controller

Publications (1)

Publication Number Publication Date
CN105974958A true CN105974958A (en) 2016-09-28

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CN201610452017.XA Pending CN105974958A (en) 2016-06-21 2016-06-21 High-precision signal acquisition and processing system for digital temperature controller

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106910280A (en) * 2017-02-04 2017-06-30 深圳怡化电脑股份有限公司 The pre- reading circuit of chip card and finance self-help traction equipment
CN110460313A (en) * 2019-08-22 2019-11-15 湘潭大学 A kind of small-signal reading circuit for radiation detector
CN110794889A (en) * 2019-10-29 2020-02-14 刘洋 Temperature control system for slice dyeing reaction cabin

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106910280A (en) * 2017-02-04 2017-06-30 深圳怡化电脑股份有限公司 The pre- reading circuit of chip card and finance self-help traction equipment
CN110460313A (en) * 2019-08-22 2019-11-15 湘潭大学 A kind of small-signal reading circuit for radiation detector
CN110794889A (en) * 2019-10-29 2020-02-14 刘洋 Temperature control system for slice dyeing reaction cabin
CN110794889B (en) * 2019-10-29 2021-06-22 刘洋 Temperature control system for slice dyeing reaction cabin

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