CN106020271A - Filtering high precision constant temperature automatic control system based on two-stage amplification circuit - Google Patents
Filtering high precision constant temperature automatic control system based on two-stage amplification circuit Download PDFInfo
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- CN106020271A CN106020271A CN201610546342.2A CN201610546342A CN106020271A CN 106020271 A CN106020271 A CN 106020271A CN 201610546342 A CN201610546342 A CN 201610546342A CN 106020271 A CN106020271 A CN 106020271A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
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Abstract
The invention discloses a filtering high precision constant temperature automatic control system based on a two-stage amplification circuit. The system is characterized in that the system is mainly composed of a transformer T, a diode rectifier U2, a control chip U1, a temperature sensor Q, a transistor VT1, a heater M, a filtering circuit which is connected with the temperature sensor Q and the like. According to the invention, a TC621 integrated chip is combined with a peripheral circuit, so that interference signals doped in temperature signals can be filtered out to improve the stability of the temperature signals; a signal outputted by the temperature sensor can be amplified, so that the TC621 integrated chip can recognize the signal; the TC621 integrated chip compares the temperature signals with the internal reference signal to accurately judge the temperature of the current environment; and the work of the heater can be accurately controlled according to a judgment result, so as to improve the temperature control accuracy.
Description
Technical field
The present invention relates to automation field, specifically refer to a kind of filtering type based on two-stage amplifying circuit high-precision
Degree constant-temperature automatic control system.
Background technology
In industrial processes, typically require the temperature to environment carry out thermostatic control, along with industrial automation
Raising, current people generally use constant-temperature automatic control system to be controlled ambient temperature, make environment temperature
Degree maintains in optimal scope, thus improves production efficiency.
Along with the fast development of science and technology, temperature controlled precision, stability requirement are more come by every field
The highest, this just has higher requirement to traditional constant-temperature automatic control system.But, traditional constant temperature
Automatic control system is the highest to temperature controlled precision, is extremely difficult to industrial demand.
Summary of the invention
It is an object of the invention to solve current constant-temperature automatic control system the highest to temperature controlled precision
Defect, it is provided that a kind of filtering type High Accuracy Constant Temperature automatic control system based on two-stage amplifying circuit.
The purpose of the present invention is by following technical proposals reality: a kind of filtering type based on two-stage amplifying circuit is high
Precision constant-temperature automatic control system, mainly by transformator T, diode rectifier U2, control chip U1, temperature
Degree sensor Q, audion VT1, heater M, the filter circuit being connected with temperature sensor Q, with
The two-stage amplifying circuit that the NTC pin of control chip U1 is connected, P pole is connected with filter circuit, N
The N pole of the diode D1 that pole is connected with two-stage amplifying circuit after resistance R2, one end and diode D1
Be connected, resistance R1 that the other end is connected with the HS pin of control chip U1, one end and diode D1
The resistance R3 that N pole is connected, the other end is connected with the LS pin of control chip U1, be serially connected in control
Resistance R4 between HL pin and the base stage of audion VT1 of coremaking sheet U1, negative pole and audion VT1
Electric capacity C1, the P pole that colelctor electrode is connected, positive pole is connected with the N pole of diode D1 and audion VT1
The diode D2 that emitter stage is connected, N pole is connected with the VSS pin of control chip U1, be serially connected in
Triggering on-off circuit between the outfan of control chip U1 and diode rectifier U2, electric with triggering switch
The relay K composition that road is connected；The Same Name of Ends of the secondary inductance coil of described transformator T and non-same polarity
It is connected with the input of diode rectifier U2；The Same Name of Ends sequentially warp of the former limit inductance coil of transformator T
After heater M and the normally opened contact K-1 of relay K, the non-same polarity with former limit inductance coil is connected；Institute
The N pole of the cathode output end and diode D1 of stating diode rectifier U2 is connected, its cathode output end then
It is connected with the VSS pin of control chip U1；The N pole of described diode D1 is also with control chip U1's
VDD pin is connected.
Further, described filter circuit by field effect transistor MOS, audion VT5, audion VT6, just
Pole is connected with the base stage of audion VT5, negative pole is as electric capacity C5, the P pole of the input of this filter circuit
Be connected with the colelctor electrode of audion VT5, N pole emitter stage with audion VT6 after electric capacity C8 is connected
The diode D7 connect, positive pole is connected with the drain electrode of field effect transistor MOS, the base of negative pole and audion VT6
Electric capacity C6, the N pole that pole is connected is connected with the colelctor electrode of audion VT6, the diode of P pole ground connection
D9, resistance R14, the N pole being serially connected between the P pole of diode D9 and the base stage of audion VT6 and electricity
The negative pole holding C6 is connected, the diode D8 of P pole ground connection, positive pole is connected with the N pole of diode D7,
The electric capacity C7 that negative pole is connected with the P pole of diode D8, and the emitter stage phase of one end and audion VT5
The resistance R12 composition that connection, the other end are connected with the source electrode of field effect transistor MOS after resistance R13；
The junction point of described resistance R12 and resistance R13 is connected with the P pole of diode D8；Described audion VT5
Colelctor electrode be connected with the grid of field effect transistor MOS；The colelctor electrode of described audion VT6 is as this filter
The outfan of wave circuit is also connected with the P pole of diode D1；The input of described filter circuit then with temperature
Sensor Q is connected.
Described two-stage amplifying circuit is by amplifier P1, amplifier P2, audion VT4, one end and amplifier
The negative pole of P1 is connected, the other end is as the resistance R8 of the input of this two-stage amplifying circuit, negative pole and amplification
The electric capacity C4 that the outfan of device P1 is connected, positive pole negative pole with amplifier P1 after resistance R9 is connected,
The diode D5 that P pole is connected with the outfan of amplifier P1, N pole is connected with the negative pole of amplifier P2,
It is serially connected in the resistance R11 between negative pole and the outfan of amplifier P2, the positive pole phase of negative pole and amplifier P1
The electric capacity C3 that connection, positive pole are connected with the positive pole of amplifier P2, one end is connected with the positive pole of amplifier P2
Connect, the resistance R10 of other end ground connection, and P pole is connected with the positive pole of amplifier P2, N pole and three poles
The diode D6 composition that the base stage of pipe VT4 is connected；The grounded collector of described audion VT4, its
Emitter-base bandgap grading is connected with the outfan of amplifier P2；The outfan of described amplifier P2 amplifies electricity as this two-stage
The outfan on road is also connected with the NTC pin of control chip U1；The input of described two-stage amplifying circuit
After resistance R2, the N pole with diode D1 is connected.
Described triggering on-off circuit is by audion VT2, audion VT3, amplifier P, P pole and audion
Diode D3, the P pole that the colelctor electrode of VT2 is connected, N pole is connected with the colelctor electrode of audion VT3 with
The colelctor electrode of audion VT3 is connected, N pole is connected with the cathode output end of diode rectifier U2
Diode D4, the resistance R6 being serially connected between the positive pole of amplifier P and the colelctor electrode of audion VT3, negative
The electric capacity C2 that pole is connected with the CON pin of control chip U1, positive pole is connected with the negative pole of amplifier P,
And the resistance R7 composition being serially connected between the emitter stage of audion VT3 and the emitter stage of audion VT2；
Described relay K is in parallel with diode D4；The emitter stage of described audion VT2 and control chip U1
VSS pin be connected while ground connection；The base stage of described audion VT3 and the outfan phase of amplifier P
Connect.
Described control chip U1 is the integrated chip of TC621.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) present invention uses the integrated chip of TC621 to combine with peripheral circuit, enables the invention to preferably
Temperature signal is processed, improves the stability of temperature signal, enable the integrated chip of TC621 more preferable
Reference signal internal with it for temperature signal is compared, judges the temperature conditions of current environment accurately,
So that the present invention can control heater work accurately according to judged result, the most then can improve this
Bright temperature control precision.
(2) signal of temperature sensor output can be amplified processing by the present invention, so that control chip
Preferably signal can be identified, and determine the temperature of environment accurately, greatly improve this
Bright temperature control precision.
(3) the interference signal being entrained in temperature signal can be filtered by the present invention, it is to avoid interference signal
Affect the present invention judgement to ambient temperature, improve the temperature controlled precision of the present invention.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the two-stage amplifying circuit of the present invention.
Fig. 3 is the structure chart of the filter 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 transformator T, diode rectifier U2, control chip U1, temperature
Degree sensor Q, audion VT1, heater M, the filter circuit being connected with temperature sensor Q, with
The two-stage amplifying circuit that the NTC pin of control chip U1 is connected, P pole is connected with filter circuit, N
The N pole of the diode D1 that pole is connected with two-stage amplifying circuit after resistance R2, one end and diode D1
Be connected, resistance R1 that the other end is connected with the HS pin of control chip U1, one end and diode D1
The resistance R3 that N pole is connected, the other end is connected with the LS pin of control chip U1, be serially connected in control
Resistance R4 between HL pin and the base stage of audion VT1 of coremaking sheet U1, negative pole and audion VT1
Electric capacity C1, the P pole that colelctor electrode is connected, positive pole is connected with the N pole of diode D1 and audion VT1
The diode D2 that emitter stage is connected, N pole is connected with the VSS pin of control chip U1, be serially connected in
Triggering on-off circuit between the outfan of control chip U1 and diode rectifier U2, electric with triggering switch
The relay K composition that road is connected.
The Same Name of Ends of the secondary inductance coil of described transformator T and non-same polarity are defeated with diode rectifier U2's
Enter end to be connected.The Same Name of Ends sequentially heater via M of the former limit inductance coil of transformator T and relay K
After normally opened contact K-1, the non-same polarity with former limit inductance coil is connected.Described diode rectifier U2 is just
Pole outfan is connected with the N pole of diode D1, its cathode output end then with the VSS of control chip U1
Pin is connected.The N pole of described diode D1 is also connected with the VDD pin of control chip U1.For
Preferably reaching the purpose of the present invention, it is real that described control chip U1 preferentially uses the integrated chip of TC621
Existing；This temperature sensor Q then uses AD590 temperature sensor.
Further, described triggering on-off circuit is by audion VT2, audion VT3, amplifier P, electricity
Resistance R6, resistance R7, electric capacity C2, diode D3 and diode D4 composition.
During connection, the P pole of diode D3 is connected with the colelctor electrode of audion VT2, its N pole and three poles
The colelctor electrode of pipe VT3 is connected.The P pole of diode D4 is connected with the colelctor electrode of audion VT3, it
N pole is connected with the cathode output end of diode rectifier U2.Resistance R6 is serially connected in the positive pole of amplifier P
And between the colelctor electrode of audion VT3.The negative pole of electric capacity C2 is connected with the CON pin of control chip U1
Connect, its positive pole is connected with the negative pole of amplifier P.Resistance R7 be serially connected in audion VT3 emitter stage and
Between the emitter stage of audion VT2.
Meanwhile, described relay K is in parallel with diode D4；The emitter stage of described audion VT2 and control
The VSS pin of coremaking sheet U1 be connected while ground connection.The base stage of described audion VT3 and amplifier P
Outfan be connected.
As in figure 2 it is shown, described two-stage amplifying circuit is by amplifier P1, amplifier P2, audion VT4, electricity
Resistance R8, resistance R9, resistance R10, resistance R11, diode D5, diode D6, electric capacity C3 and
Electric capacity C4 forms.
During connection, one end of resistance R8 is connected with the negative pole of amplifier P1, its other end is as this two-stage
The input of amplifying circuit and after resistance R2 N pole with diode D1 be connected.The negative pole of electric capacity C4
Be connected with the outfan of amplifier P1, its positive pole negative pole with amplifier P1 after resistance R9 is connected.
The P pole of diode D5 is connected with the outfan of amplifier P1, the negative pole phase of its N pole and amplifier P2
Connect.Resistance R11 is serially connected between negative pole and the outfan of amplifier P2.The negative pole of electric capacity C3 and amplification
The positive pole of device P1 is connected, its positive pole is connected with the positive pole of amplifier P2.One end of resistance R10 with put
The positive pole of big device P2 is connected, its other end ground connection.The P pole of diode D6 and the positive pole phase of amplifier P2
Connect, its N pole is connected with the base stage of audion VT4.
The grounded collector of described audion VT4, its emitter stage are connected with the outfan of amplifier P2.Institute
State the outfan of the amplifier P2 NTC as the outfan of this two-stage amplifying circuit and with control chip U1 to manage
Foot is connected.
As it is shown on figure 3, described filter circuit is by field effect transistor MOS, audion VT5, audion VT6,
Resistance R12, resistance R13, resistance R14, electric capacity C5, electric capacity C6, electric capacity C7, electric capacity C8, two poles
Pipe D7, diode D8 and diode D9 form.
During connection, the positive pole of electric capacity C5 is connected with the base stage of audion VT5, its negative pole is as this filtering
The input of circuit is also connected with temperature sensor.The P pole of diode D7 and the current collection of audion VT5
Pole is connected, its N pole emitter stage with audion VT6 after electric capacity C8 is connected.The positive pole of electric capacity C6
Be connected with the drain electrode of field effect transistor MOS, its negative pole is connected with the base stage of audion VT6.Diode
The N pole of D9 is connected with the colelctor electrode of audion VT6, its P pole ground connection.Resistance R14 is serially connected in two poles
Between P pole and the base stage of audion VT6 of pipe D9.The N pole of diode D8 and the negative pole phase of electric capacity C6
Connection, its P pole ground connection.The positive pole of electric capacity C7 is connected with the N pole of diode D7, its negative pole and two poles
The P pole of pipe D8 is connected.One end of resistance R12 is connected with the emitter stage of audion VT5, its another
End source electrode with field effect transistor MOS after resistance R13 is connected.
The junction point of described resistance R12 and resistance R13 is connected with the P pole of diode D8.Described three poles
The colelctor electrode of pipe VT5 is connected with the grid of field effect transistor MOS.The colelctor electrode of described audion VT6 is made
For the outfan of this filter circuit and it is connected with the P pole of diode D1.
During work, temperature sensor Q gathers the temperature of environment and exports corresponding signal, control chip U1
Receive the signal of temperature sensor Q output and reference signal internal with it for signal is compared, accurately sentencing
Make current environmental temperature situation, its CON pin output high level when ambient temperature is less than the temperature set
Making audion VT3 turn on, at this moment relay K obtains electric its normally opened contact K-1 Guan Bi, and heater M starts
Work.When environment is in the range of setting, the CON pin output low level of control chip U1, three
Pole pipe VT3 is not turned on, and relay K must not remain open by its normally opened triggering K-1 of electricity, and heater does not works.
The present invention uses the integrated chip of TC621 to combine with peripheral circuit, enables the invention to preferably mixing
Miscellaneous interference signal in temperature signal filters, and improves the stability of temperature signal, meanwhile, the present invention
Can be amplified processing to the signal of temperature sensor output, enable the integrated chip of TC621 the most right
Signal is identified, and reference signal internal with it for temperature signal is compared, and judges accurately to work as
The temperature conditions of front environment, so that the present invention can control heater work accurately according to judged result,
Such then the temperature control precision of the present invention can be improved.
As it has been described above, just can well realize the present invention.
Claims (5)
1. a filtering type High Accuracy Constant Temperature automatic control system based on two-stage amplifying circuit, it is characterised in that:
It is main by transformator T, diode rectifier U2, control chip U1, temperature sensor Q, audion VT1,
Heater M, the filter circuit being connected with temperature sensor Q, with the NTC pin phase of control chip U1
The two-stage amplifying circuit connected, P pole is connected with filter circuit, electricity is amplified with two-stage after resistance R2 in N pole
The diode D1 that road is connected, one end is connected with the N pole of diode D1, the other end and control chip U1
The resistance R1 that is connected of HS pin, one end is connected with the N pole of diode D1, the other end and control
The resistance R3 that the LS pin of chip U1 is connected, is serially connected in HL pin and the audion of control chip U1
Resistance R4 between the base stage of VT1, negative pole is connected with the colelctor electrode of audion VT1, positive pole and diode
Electric capacity C1, the P pole that the N pole of D1 is connected is connected with the emitter stage of audion VT1, N pole and control
The diode D2 that the VSS pin of chip U1 is connected, is serially connected in control chip U1 and diode rectifier
Triggering on-off circuit between the outfan of U2, the relay K composition being connected with triggering on-off circuit；Institute
State the input phase of the Same Name of Ends of the secondary inductance coil of transformator T and non-same polarity and diode rectifier U2
Connect；The Same Name of Ends sequentially heater via M of the former limit inductance coil of transformator T and the normally opened of relay K touch
It is connected with the non-same polarity of former limit inductance coil after some K-1；The positive pole output of described diode rectifier U2
End is connected with the N pole of diode D1, its cathode output end then with the VSS pin phase of control chip U1
Connect；The N pole of described diode D1 is also connected with the VDD pin of control chip U1.
A kind of filtering type High Accuracy Constant Temperature based on two-stage amplifying circuit the most according to claim 1 is automatic
Control system, it is characterised in that: described filter circuit is by field effect transistor MOS, audion VT5, audion
VT6, positive pole is connected with the base stage of audion VT5, negative pole is as the electric capacity of the input of this filter circuit
C5, P pole is connected with the colelctor electrode of audion VT5, N pole after electric capacity C8 with audion VT6 send out
The diode D7 that emitter-base bandgap grading is connected, positive pole is connected with the drain electrode of field effect transistor MOS, negative pole and audion
Electric capacity C6, the N pole that the base stage of VT6 is connected is connected with the colelctor electrode of audion VT6, P pole ground connection
Diode D9, the resistance R14, N being serially connected between the P pole of diode D9 and the base stage of audion VT6
Pole is connected with the negative pole of electric capacity C6, the diode D8 of P pole ground connection, the N pole phase of positive pole and diode D7
Connect, the electric capacity C7 that is connected with the P pole of diode D8 of negative pole, and one end and audion VT5
The resistance R12 that emitter-base bandgap grading is connected, the other end is connected with the source electrode of field effect transistor MOS after resistance R13
Composition；The junction point of described resistance R12 and resistance R13 is connected with the P pole of diode D8；Described three
The colelctor electrode of pole pipe VT5 is connected with the grid of field effect transistor MOS；The colelctor electrode of described audion VT6
As the outfan of this filter circuit and it is connected with the P pole of diode D1；The input of described filter circuit
Then it is connected with temperature sensor Q.
A kind of filtering type High Accuracy Constant Temperature based on two-stage amplifying circuit the most according to claim 2 is automatic
Control system, it is characterised in that: described two-stage amplifying circuit is by amplifier P1, amplifier P2, audion
VT4, one end is connected with the negative pole of amplifier P1, the other end is as the input of this two-stage amplifying circuit
Resistance R8, negative pole is connected with the outfan of amplifier P1, positive pole after resistance R9 with amplifier P1's
Electric capacity C4, the P pole that negative pole is connected is connected with the outfan of amplifier P1, N pole and amplifier P2
The diode D5 that negative pole is connected, is serially connected in the resistance R11 between negative pole and the outfan of amplifier P2,
The electric capacity C3 that negative pole is connected with the positive pole of amplifier P1, positive pole is connected with the positive pole of amplifier P2, one
End is connected with the positive pole of amplifier P2, the resistance R10 of other end ground connection, and P pole and amplifier P2
The diode D6 that positive pole is connected, N pole is connected with the base stage of audion VT4 composition；Described three poles
The grounded collector of pipe VT4, its emitter stage are connected with the outfan of amplifier P2；Described amplifier P2
Outfan as the outfan of this two-stage amplifying circuit and be connected with the NTC pin of control chip U1；
The input of described two-stage amplifying circuit N pole with diode D1 after resistance R2 is connected.
A kind of filtering type High Accuracy Constant Temperature based on two-stage amplifying circuit the most according to claim 3 is automatic
Control system, it is characterised in that: described triggering on-off circuit, by audion VT2, audion VT3, amplifies
Device P, P pole is connected with the colelctor electrode of audion VT2, N pole is connected with the colelctor electrode of audion VT3
Diode D3, P pole be connected with the colelctor electrode of audion VT3, N pole and diode rectifier U2
The diode D4 that cathode output end is connected, is serially connected in positive pole and the colelctor electrode of audion VT3 of amplifier P
Between resistance R6, negative pole is connected with the CON pin of control chip U1, positive pole and amplifier P negative
The electric capacity C2 that pole is connected, and it is serially connected in emitter stage and the emitter stage of audion VT2 of audion VT3
Between resistance R7 composition；Described relay K is in parallel with diode D4；Described audion VT2's
Emitter stage be connected with the VSS pin of control chip U1 while ground connection；The base stage of described audion VT3
It is connected with the outfan of amplifier P.
A kind of filtering type High Accuracy Constant Temperature based on two-stage amplifying circuit the most according to claim 4 is automatic
Control system, it is characterised in that: described control chip U1 is the integrated chip of TC621.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546342.2A CN106020271A (en) | 2016-07-12 | 2016-07-12 | Filtering high precision constant temperature automatic control system based on two-stage amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546342.2A CN106020271A (en) | 2016-07-12 | 2016-07-12 | Filtering high precision constant temperature automatic control system based on two-stage amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106020271A true CN106020271A (en) | 2016-10-12 |
Family
ID=57108859
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610546342.2A Pending CN106020271A (en) | 2016-07-12 | 2016-07-12 | Filtering high precision constant temperature automatic control system based on two-stage amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106020271A (en) |
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2016
- 2016-07-12 CN CN201610546342.2A patent/CN106020271A/en active Pending
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Application publication date: 20161012 |
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