CN106020281A - Signal amplification type high precision constant temperature automatic control system based on buffer protection circuit - Google Patents
Signal amplification type high precision constant temperature automatic control system based on buffer protection circuit Download PDFInfo
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- CN106020281A CN106020281A CN201610546289.6A CN201610546289A CN106020281A CN 106020281 A CN106020281 A CN 106020281A CN 201610546289 A CN201610546289 A CN 201610546289A CN 106020281 A CN106020281 A CN 106020281A
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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
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention discloses a signal amplification type high precision constant temperature automatic control system based on a buffer protection circuit. The system is characterized in that the system mainly comprises a transformer T, a diode rectifier U2, a control chip U1, a temperature sensor Q, a transistor VT1, a heater M, a two-stage amplifier circuit which is connected with the NTC pin of the control chip U1 and the like. According to the invention, a TC621 integrated chip and a peripheral circuit are combined, so that a temperature signal can be well handled to improve the stability of the temperature signal; a signal outputted by the temperature sensor can be amplified, so that the TC621 integrated chip can identify the signal and compares the temperature signal 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 signal scale-up version based on buffer protection circuit
High Accuracy 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 signal scale-up version High Accuracy Constant Temperature automatic control system based on buffer protection circuit.
The purpose of the present invention is by following technical proposals reality: signal scale-up version based on buffer protection 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, with control chip U1 NTC pin be connected two
Level amplifying circuit, P pole is connected with temperature sensor Q, N pole after resistance R2 with two-stage amplifying circuit phase
The diode D1 that connects, one end is connected with the N pole of diode D1, the other end and control chip U1
The resistance R1 that HS pin is connected, one end is connected with the N pole of diode D1, the other end and control chip
The resistance R3 that the LS pin of U1 is connected, is serially connected in HL pin and the audion VT1 of control chip U1
Base stage between resistance R4, negative pole is connected with the colelctor electrode of audion VT1, positive pole and diode D1
Electric capacity C1, the P pole that is connected, N pole be connected with the emitter stage of audion VT1, N pole and control chip
The diode D2 that the VSS pin of U1 is connected, the triggering on-off circuit being connected with control chip U1,
The relay K being connected with triggering on-off circuit, and it is serially connected in triggering on-off circuit and diode rectifier
Buffer protection circuit composition between the cathode output end of U2；The secondary inductance coil of described transformator T same
Name end is connected with the input of non-same polarity with diode rectifier U2；The former limit inductance coil of transformator T
Same Name of Ends sequentially heater via M and relay K normally opened contact K-1 after with former limit inductance coil non-with
Name end is connected；The cathode output end of described diode rectifier U2 respectively with trigger on-off circuit and diode
The N pole of D1 is connected；Described triggering on-off circuit is also connected with the VSS pin of control chip U1；Institute
The N pole stating diode D1 is also connected with the VDD pin of control chip U1.
Further, described two-stage amplifying circuit is by amplifier P3, amplifier P4, audion VT5, one end
Be connected with the negative pole of amplifier P3, the other end as the resistance R11 of the input of this two-stage amplifying circuit,
Negative pole is connected with the outfan of amplifier P3, positive pole negative pole with amplifier P3 after resistance R12 is connected
Electric capacity C6, the P pole connect is connected with the outfan of amplifier P3, N pole is connected with the negative pole of amplifier P4
The diode D7 connect, is serially connected in the resistance R14 between negative pole and the outfan of amplifier P4, negative pole with put
The electric capacity C5 that positive pole is connected, positive pole is connected with the positive pole of amplifier P4 of big device P3, one end and amplification
The positive pole of device P4 is connected, the resistance R13 of other end ground connection, and the positive pole phase of P pole and amplifier P4
The diode D8 composition that connection, N pole are connected with the base stage of audion VT5；Described audion VT5's
Grounded collector, its emitter stage are connected with the outfan of amplifier P4；The outfan of described amplifier P4
As the outfan of this two-stage amplifying circuit and it is connected with the NTC pin of control chip U1；Described two-stage
The input of amplifying circuit N pole with diode D1 after resistance R2 is connected.
Described buffer protection electricity routing amplifier P1, amplifier P2, field effect transistor MOS, audion VT4,
Resistance R8, the N pole being serially connected between negative pole and the outfan of amplifier P is connected with the negative pole of amplifier P1
Connect, the P pole phase of diode D5, the P pole as the input of this buffer protection circuit, the P pole and diode D5
The diode D6 that connection, N pole are connected with the grid of field effect transistor MOS, is serially connected in audion VT4's
Resistance R9 between base stage and colelctor electrode, negative pole is connected with the emitter stage of audion VT4, positive pole and amplification
The electric capacity C3 that the negative pole of device P2 is connected, is just being serially connected in the drain electrode of field effect transistor MOS and amplifier P2
Resistance R10 between pole, and negative pole is connected with the drain electrode of field effect transistor MOS, positive pole and amplifier P2
Outfan be connected electric capacity C4 composition；The plus earth of described amplifier P1, its outfan are imitated with field
Should the drain electrode of pipe MOS be connected；The described base stage of audion VT4 is connected with the source electrode of field effect transistor MOS
Connect, its grounded collector；The outfan of described amplifier P2 as this buffer protection circuit outfan and with
The VSS pin of control chip U1 is connected；The input of described buffer protection circuit and diode rectifier
The cathode output end of U2 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) present invention can improve the switch condition of electronic device, reduces electronic device and in energising and breaks
Loss during electric moment, extends the service life of the present invention.
(3) 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.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the buffering holding circuit of the present invention.
Fig. 3 is the structure chart of the two-stage amplifying 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, with control chip U1 NTC pin be connected two
Level amplifying circuit, P pole is connected with temperature sensor Q, N pole after resistance R2 with two-stage amplifying circuit phase
The diode D1 that connects, one end is connected with the N pole of diode D1, the other end and control chip U1
The resistance R1 that HS pin is connected, one end is connected with the N pole of diode D1, the other end and control chip
The resistance R3 that the LS pin of U1 is connected, is serially connected in HL pin and the audion VT1 of control chip U1
Base stage between resistance R4, negative pole is connected with the colelctor electrode of audion VT1, positive pole and diode D1
Electric capacity C1, the P pole that is connected, N pole be connected with the emitter stage of audion VT1, N pole and control chip
The diode D2 that the VSS pin of U1 is connected, the triggering on-off circuit being connected with control chip U1,
The relay K being connected with triggering on-off circuit, and it is serially connected in triggering on-off circuit and diode rectifier
Buffer protection circuit composition between the cathode output end of U2.
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 triggering on-off circuit and diode D1 respectively.Described triggering on-off circuit
Also it is connected with the VSS pin of control chip U1.The N pole of described diode D1 also with control chip U1
VDD pin be connected.In order to preferably reach the purpose of the present invention, described control chip U1 preferentially adopts
Realize with the integrated chip of TC621；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 buffer protection electricity routing amplifier P1, amplifier P2, field effect transistor MOS,
Audion VT4, resistance R8, resistance R9, resistance R10, electric capacity C3, electric capacity C4, diode D5 with
And diode D6 composition.
During connection, resistance R8 is serially connected between negative pole and the outfan of amplifier P.The N pole of diode D5
Be connected with the negative pole of amplifier P1, its P pole is as the input of this buffer protection circuit whole with diode
The cathode output end of stream device U2 is connected.The P pole of diode D6 is connected with the P pole of diode D5,
Its N pole is connected with the grid of field effect transistor MOS.Resistance R9 is serially connected in base stage and the collection of audion VT4
Between electrode.The negative pole of electric capacity C3 is connected with the emitter stage of audion VT4, its positive pole and amplifier P2
Negative pole be connected.Resistance R10 is serially connected between the drain electrode of field effect transistor MOS and the positive pole of amplifier P2.
The negative pole of electric capacity C4 is connected with the drain electrode of field effect transistor MOS, the outfan phase of its positive pole and amplifier P2
Connect.
The plus earth of described amplifier P1, its outfan are connected with the drain electrode of field effect transistor MOS.Institute
The source electrode of the base stage and field effect transistor MOS of stating audion VT4 is connected, its grounded collector.Described put
The outfan of big device P2 as this buffer protection circuit outfan and with the VSS pin phase of control chip U1
Connect.
As it is shown on figure 3, described two-stage amplifying circuit is by amplifier P3, amplifier P4, audion VT5, electricity
Resistance R11, resistance R12, resistance R13, resistance R14, diode D7, diode D8, electric capacity C5 with
And electric capacity C6 composition.
During connection, one end of resistance R11 is connected with the negative pole of amplifier P3, 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 C6
Be connected with the outfan of amplifier P3, its positive pole negative pole with amplifier P3 after resistance R12 is connected.
The P pole of diode D7 is connected with the outfan of amplifier P3, the negative pole phase of its N pole and amplifier P4
Connect.Resistance R14 is serially connected between negative pole and the outfan of amplifier P4.The negative pole of electric capacity C5 and amplification
The positive pole of device P3 is connected, its positive pole is connected with the positive pole of amplifier P4.One end of resistance R13 with put
The positive pole of big device P4 is connected, its other end ground connection.The P pole of diode D8 and the positive pole phase of amplifier P4
Connect, its N pole is connected with the base stage of audion VT5.
The grounded collector of described audion VT5, its emitter stage are connected with the outfan of amplifier P4.Institute
State the outfan of the amplifier P4 NTC as the outfan of this two-stage amplifying circuit and with control chip U1 to manage
Foot is connected.
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 temperature
Degree signal processes, and improves the stability of temperature signal, and meanwhile, the present invention can be defeated to temperature sensor
The signal gone out is amplified processing, and enables the integrated chip of TC621 to be preferably identified signal, and will
Temperature signal compares with the reference signal of its inside, 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.Meanwhile, the present invention can improve the switch condition of electronic device, reduces electricity
The loss when energising and shutdown transient of the sub-device, extends the service life of the present invention.
As it has been described above, just can well realize the present invention.
Claims (5)
1. signal scale-up version High Accuracy Constant Temperature automatic control system based on buffer protection 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 two-stage amplifying circuit being connected with the NTC pin of control chip U1, P pole passes with temperature
The diode D1 that sensor Q is connected, N pole is connected with two-stage amplifying circuit after resistance R2, one end with
The resistance R1 that the N pole of diode D1 is connected, the other end is connected with the HS pin of control chip U1,
The electricity that one end is connected with the N pole of diode D1, the other end is connected with the LS pin of control chip U1
Resistance R3, the resistance R4 being serially connected between the HL pin of control chip U1 and the base stage of audion VT1, negative
The electric capacity C1 that pole is connected with the colelctor electrode of audion VT1, positive pole is connected with the N pole of diode D1,
P pole is connected with the emitter stage of audion VT1, N pole is connected with the VSS pin of control chip U1
Diode D2, the triggering on-off circuit being connected with control chip U1, it is connected with triggering on-off circuit
Relay K, and it is serially connected in trigger between on-off circuit and the cathode output end of diode rectifier U2 slow
Rush protection circuit composition；The Same Name of Ends of the secondary inductance coil of described transformator T and non-same polarity and diode
The input of commutator U2 is connected；The Same Name of Ends sequentially heater via M of the former limit inductance coil of transformator T
It is connected with non-same polarity with former limit inductance coil after the normally opened contact K-1 of relay K；Described diode
The cathode output end of commutator U2 is connected with the N pole triggering on-off circuit and diode D1 respectively；Described
Trigger on-off circuit to be also connected with the VSS pin of control chip U1；The N pole of described diode D1 is also
It is connected with the VDD pin of control chip U1.
Signal scale-up version High Accuracy Constant Temperature based on buffer protection circuit the most according to claim 1 is automatic
Control system, it is characterised in that: described two-stage amplifying circuit is by amplifier P3, amplifier P4, audion
VT5, one end is connected with the negative pole of amplifier P3, the other end is as the input of this two-stage amplifying circuit
Resistance R11, negative pole is connected with the outfan of amplifier P3, positive pole after resistance R12 with amplifier P3
Electric capacity C6, the P pole that is connected of negative pole be connected with the outfan of amplifier P3, N pole and amplifier P4
The diode D7 that is connected of negative pole, be serially connected in the resistance R14 between negative pole and the outfan of amplifier P4,
The electric capacity C5 that negative pole is connected with the positive pole of amplifier P3, positive pole is connected with the positive pole of amplifier P4, one
End is connected with the positive pole of amplifier P4, the resistance R13 of other end ground connection, and P pole and amplifier P4
The diode D8 that positive pole is connected, N pole is connected with the base stage of audion VT5 composition；Described three poles
The grounded collector of pipe VT5, its emitter stage are connected with the outfan of amplifier P4；Described amplifier P4
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.
Signal scale-up version High Accuracy Constant Temperature based on buffer protection circuit the most according to claim 2 is automatic
Control system, it is characterised in that: described buffer protection electricity routing amplifier P1, amplifier P2, field effect transistor
MOS, audion VT4, resistance R8, the N pole being serially connected between negative pole and the outfan of amplifier P with put
The negative pole of big device P1 is connected, P pole as the input of this buffer protection circuit diode D5, P pole with
The diode D6 that the P pole of diode D5 is connected, N pole is connected with the grid of field effect transistor MOS, string
It is connected on the emitter stage of the resistance R9 between base stage and the colelctor electrode of audion VT4, negative pole and audion VT4
Be connected, electric capacity C3 that positive pole is connected with the negative pole of amplifier P2, be serially connected in the leakage of field effect transistor MOS
Resistance R10 between the positive pole of pole and amplifier P2, and negative pole is connected with the drain electrode of field effect transistor MOS
Connect, electric capacity C4 that positive pole is connected with the outfan of amplifier P2 composition；The positive pole of described amplifier P1 connects
Ground, its outfan are connected with the drain electrode of field effect transistor MOS；The base stage of described audion VT4 is imitated with field
Should the source electrode of pipe MOS be connected, its grounded collector；The outfan of described amplifier P2 is as this buffering
The outfan of protection circuit is also connected with the VSS pin of control chip U1；Described buffer protection circuit
Input is connected with the cathode output end of diode rectifier U2.
Signal scale-up version High Accuracy Constant Temperature based on buffer protection 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.
Signal scale-up version High Accuracy Constant Temperature based on buffer protection 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 |
|---|---|---|---|
| CN201610546289.6A CN106020281A (en) | 2016-07-12 | 2016-07-12 | Signal amplification type high precision constant temperature automatic control system based on buffer protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546289.6A CN106020281A (en) | 2016-07-12 | 2016-07-12 | Signal amplification type high precision constant temperature automatic control system based on buffer protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106020281A true CN106020281A (en) | 2016-10-12 |
Family
ID=57109932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610546289.6A Pending CN106020281A (en) | 2016-07-12 | 2016-07-12 | Signal amplification type high precision constant temperature automatic control system based on buffer protection circuit |
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| CN (1) | CN106020281A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292755A (en) * | 2016-10-13 | 2017-01-04 | 四川森迪科技发展股份有限公司 | Plant based on current buffering protection circuit drinking trough water level control system |
-
2016
- 2016-07-12 CN CN201610546289.6A patent/CN106020281A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292755A (en) * | 2016-10-13 | 2017-01-04 | 四川森迪科技发展股份有限公司 | Plant based on current buffering protection circuit drinking trough water level control system |
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Application publication date: 20161012 |