CN106054970A - Automatic high precision constant temperature control system based on two-stage amplification circuit - Google Patents
Automatic high precision constant temperature control system based on two-stage amplification circuit Download PDFInfo
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- CN106054970A CN106054970A CN201610546624.2A CN201610546624A CN106054970A CN 106054970 A CN106054970 A CN 106054970A CN 201610546624 A CN201610546624 A CN 201610546624A CN 106054970 A CN106054970 A CN 106054970A
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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 an automatic high precision constant temperature control system based on a two-stage amplification circuit. The control system is characterized by mainly comprising a transformer T, a diode rectifier U2, a control chip U1, a temperature sensor Q, a triode VT1 and a heater M. According to the control system, a TC621 integrated chip is employed in combination with a peripheral circuit, so processing on a temperature signal can be better carried out, stability of the temperature signal is improved, moreover, a signal outputted by the temperature sensor can be amplified, the signal can be better identified by the TC621 integrated chip, the temperature signal is compared with an internal reference signal, the environment temperature situation at present can be accurately determined, the heater can be accurately controlled for operation according to a determination result, and thereby temperature control precision can be improved.
Description
Technical field
The present invention relates to automation field, specifically refer to a kind of High Accuracy Constant Temperature based on two-stage amplifying circuit and automatically control
System processed.
Background technology
In industrial processes, typically require the temperature to environment carry out thermostatic control, along with carrying of industrial automation
Height, current people generally use constant-temperature automatic control system to be controlled ambient temperature, make ambient temperature maintain optimal
In the range of, thus improve production efficiency.
Along with the fast development of science and technology, every field is more and more higher to temperature controlled precision, stability requirement, this
Just have higher requirement to traditional constant-temperature automatic control system.But, traditional constant-temperature automatic control system is to temperature
The precision controlled is the highest, is extremely difficult to industrial demand.
Summary of the invention
It is an object of the invention to solve the defect that current constant-temperature automatic control system is the highest to temperature controlled precision,
A kind of High Accuracy Constant Temperature automatic control system based on two-stage amplifying circuit is provided.
The purpose of the present invention is by following technical proposals reality: a kind of High Accuracy Constant Temperature based on two-stage amplifying circuit is automatic
Control system, mainly 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 is connected with temperature sensor Q, N pole is through resistance
The diode D1 being connected with two-stage amplifying circuit after R2, one end is connected with the N pole of diode D1, the other end and control chip
The resistance R1 that the HS pin of U1 is connected, one end is connected with the N pole of diode D1, the LS pin of the other end and control chip U1
The resistance R3 being connected, the resistance R4 being serially connected between the HL pin of control chip U1 and the base stage of audion VT1, negative pole and three
Electric capacity C1, the P pole that the colelctor electrode of pole pipe VT1 is connected, positive pole is connected with the N pole of diode D1 and the transmitting of audion VT1
The diode D2 that pole is connected, N pole is connected with the VSS pin of control chip U1, is serially connected in control chip U1 and diode is whole
Triggering on-off circuit between the outfan of stream device U2, the relay K composition being connected with triggering on-off circuit；Described transformator
The Same Name of Ends of the secondary inductance coil of T is connected with the input of non-same polarity with diode rectifier U2；The former limit of transformator T
With the non-same polarity of former limit inductance coil after the normally opened contact K-1 of the Same Name of Ends of inductance coil sequentially heater via M and relay K
It is connected；The cathode output end of described diode rectifier U2 is connected with the N pole of diode D1, its cathode output end then with control
The VSS pin of coremaking sheet U1 is connected；The N pole of described diode D1 is also connected with the VDD pin of control chip U1.
Further, described two-stage amplifying circuit is by amplifier P1, amplifier P2, audion VT4, one end and amplifier P1
Negative pole be connected, the other end as the resistance R8 of the input of this two-stage amplifying circuit, the outfan of negative pole and amplifier P1
Be connected, electric capacity C4, P pole that positive pole negative pole with amplifier P1 after resistance R9 is connected is connected with the outfan of amplifier P1
Connect, diode D5 that N pole is connected with the negative pole of amplifier P2, be serially connected in the resistance between negative pole and the outfan of amplifier P2
R11, 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 and amplification
The positive pole of device P2 is connected, 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 stage and amplifier P2
Outfan be connected；The outfan of described amplifier P2 is as the outfan of this two-stage amplifying circuit and with control chip U1's
NTC pin is connected；The input of described two-stage amplifying circuit N pole with diode D1 after resistance R2 is connected.
Described triggering on-off circuit is by the colelctor electrode of audion VT2, audion VT3, amplifier P, P pole and audion VT2
Be connected, diode D3, P pole that N pole is connected with the colelctor electrode of audion VT3 is connected with the colelctor electrode of audion VT3, N
The diode D4 that pole is connected with the cathode output end of diode rectifier U2, is serially connected in positive pole and the audion VT3 of amplifier P
Colelctor electrode between resistance R6, negative pole is connected with the CON pin of control chip U1, positive pole is connected with the negative pole of amplifier P
The electric capacity C2 connect, and the resistance R7 composition being serially connected between the emitter stage of audion VT3 and the emitter stage of audion VT2；Institute
State relay K to be in parallel with diode D4；The emitter stage of described audion VT2 is connected with the VSS pin of control chip U1
Ground connection simultaneously；The base stage of described audion VT3 is connected with the outfan of amplifier P.
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 believe temperature
Number process, improve the stability of temperature signal, enable the integrated chip of TC621 preferably that temperature signal is internal with it
Reference signal compares, and judges the temperature conditions of current environment accurately, so that the present invention can be according to judged result
Control heater work accurately, the most then can improve the temperature control precision of the present invention.
(2) signal of temperature sensor output can be amplified processing, so that control chip can be more by the present invention
Good is identified signal, and determines the temperature of environment accurately, greatly improves the temperature control 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.
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 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 sensor Q,
The two-stage amplifying circuit that the NTC pin of audion VT1, heater M, with control chip U1 is connected, P pole and temperature sensor Q
Be connected, diode D1 that N pole is connected with two-stage amplifying circuit after resistance R2, one end is connected with the N pole of diode D1,
The resistance R1 that the other end is connected with the HS pin of control chip U1, one end is connected with the N pole of diode D1, the other end and control
The resistance R3 that the LS pin of coremaking sheet U1 is connected, is serially connected between the HL pin of control chip U1 and the base stage of audion VT1
Resistance R4, electric capacity C1, the P pole that negative pole is connected with the colelctor electrode of audion VT1, positive pole is connected with the N pole of diode D1
Be connected with the emitter stage of audion VT1, diode D2 that N pole is connected with the VSS pin of control chip U1, be serially connected in control
Triggering on-off circuit between the outfan of chip U1 and diode rectifier U2, the relay being connected with triggering on-off circuit
K forms.
The input phase of the Same Name of Ends of the secondary inductance coil of described transformator T and non-same polarity and diode rectifier U2
Connect.With former limit after the normally opened contact K-1 of Same Name of Ends sequentially heater via M and the relay K of the former limit inductance coil of transformator T
The non-same polarity of inductance coil is connected.The cathode output end of described diode rectifier U2 is connected with the N pole of diode D1,
Its cathode output end is then 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.In order to preferably reach the purpose of the present invention, described control chip U1 preferentially uses the integrated chip of TC621
Realize；This temperature sensor Q then uses AD590 temperature sensor.
Further, described triggering on-off circuit by audion VT2, audion VT3, amplifier P, resistance R6, resistance R7,
Electric capacity C2, diode D3 and diode D4 form.
During connection, the P pole of diode D3 is connected with the colelctor electrode of audion VT2, the current collection of its N pole and audion VT3
Pole is connected.The P pole of diode D4 is connected with the colelctor electrode of audion VT3, its N pole is defeated with the positive pole of diode rectifier U2
Go out end to be connected.Resistance R6 is serially connected between the positive pole of amplifier P and the colelctor electrode of audion VT3.The negative pole of electric capacity C2 and control
The CON pin of coremaking sheet U1 is connected, its positive pole is connected with the negative pole of amplifier P.Resistance R7 is serially connected in sending out of audion VT3
Between the emitter stage of emitter-base bandgap grading and audion VT2.
Meanwhile, described relay K is in parallel with diode D4；The emitter stage of described audion VT2 is with control chip U1's
VSS pin be connected while ground connection.The base stage of described audion VT3 is connected with the outfan of amplifier P.
As in figure 2 it is shown, described two-stage amplifying circuit is by amplifier P1, amplifier P2, audion VT4, resistance R8, resistance
R9, resistance R10, resistance R11, diode D5, diode D6, electric capacity C3 and electric capacity C4 form.
During connection, one end of resistance R8 is connected with the negative pole of amplifier P1, its other end is as this two-stage amplifying circuit
Input and after resistance R2 N pole with diode D1 be connected.The negative pole of electric capacity C4 is connected with the outfan of amplifier P1
Connect, 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
Connect, its N pole is connected with the negative pole of amplifier P2.Resistance R11 is serially connected between negative pole and the outfan of amplifier P2.Electric capacity C3
Negative pole be connected with the positive pole of amplifier P1, its positive pole is connected with the positive pole of amplifier P2.One end of resistance R10 and amplification
The positive pole of device P2 is connected, its other end ground connection.The P pole of diode D6 is connected with the positive pole of amplifier P2, its N pole and three poles
The base stage of pipe VT4 is connected.
The grounded collector of described audion VT4, its emitter stage are connected with the outfan of amplifier P2.Described amplifier
The outfan of P2 as the outfan of this two-stage amplifying circuit and is connected with the NTC pin of control chip U1.
During work, temperature sensor Q gathers the temperature of environment and exports corresponding signal, and control chip U1 receives temperature and passes
Sensor Q output signal and by signal with its inside reference signal compare, accurately determine current environmental temperature situation,
When ambient temperature is less than the temperature set, its CON pin output high level makes audion VT3 turn on, and at this moment relay K obtains electric
Its normally opened contact K-1 closes, and heater M starts working.When environment is in the range of setting, the CON pipe of control chip U1
Foot output low level, audion 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 signal
Processing, improve the stability of temperature signal, meanwhile, the present invention can be amplified place to the signal of temperature sensor output
Reason, enables the integrated chip of TC621 to be preferably identified signal, and reference signal internal with it for temperature signal is carried out
Relatively, the temperature conditions of current environment is judged accurately, so that the present invention can control according to judged result to add accurately
Hot device works, the most then can improve the temperature control precision of the present invention.
As it has been described above, just can well realize the present invention.
Claims (4)
1. a High Accuracy Constant Temperature automatic control system based on two-stage amplifying circuit, it is characterised in that: main by transformator T,
The NTC pin of diode rectifier U2, control chip U1, temperature sensor Q, audion VT1, heater M, with control chip U1
The two-stage amplifying circuit being connected, P pole is connected with temperature sensor Q, N pole is connected with two-stage amplifying circuit after resistance R2
Diode D1, the resistance that one end is connected with the N pole of diode D1, the other end is connected with the HS pin of control chip U1
R1, the resistance R3 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, be serially connected in
Resistance R4 between HL pin and the base stage of audion VT1 of control chip U1, negative pole is connected with the colelctor electrode of audion VT1
Connect, electric capacity C1, P pole that positive pole is connected with the N pole of diode D1 is connected with the emitter stage of audion VT1, N pole with control core
The diode D2 that the VSS pin of sheet U1 is connected, is serially connected between the outfan of control chip U1 and diode rectifier U2
Trigger on-off circuit, the relay K composition being connected with triggering on-off circuit；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 Same Name of Ends of the former limit inductance coil of transformator T is suitable
After secondary heater via M and the normally opened contact K-1 of relay K, the non-same polarity with former limit inductance coil is connected；Described diode
The cathode output end of commutator U2 is connected with the N pole of diode D1, its cathode output end then with the VSS pin of control chip U1
It is connected；The N pole of described diode D1 is also connected with the VDD pin of control chip U1.
A kind of High Accuracy Constant Temperature automatic control system based on two-stage amplifying circuit the most according to claim 1, its feature
It is: described two-stage amplifying circuit is connected with the negative pole of amplifier P1 by amplifier P1, amplifier P2, audion VT4, one end
Connect, the other end as the resistance R8 of the input of this two-stage amplifying circuit, negative pole is connected with the outfan of amplifier P1, positive pole
Electric capacity C4, the P pole that negative pole with amplifier P1 is connected after resistance R9 is connected with the outfan of amplifier P1, N pole with put
The diode D5 that the negative pole of big device P2 is connected, is serially connected in the resistance R11 between negative pole and the outfan of amplifier P2, negative pole with
The positive pole of the electric capacity C3 that the positive pole of amplifier P1 is connected, positive pole is connected with the positive pole of amplifier P2, one end and amplifier P2
Be connected, the resistance R10 of other end ground connection, and P pole is connected with the positive pole of amplifier P2, the base stage of N pole and audion VT4
The diode D6 composition being connected；The grounded collector of described audion VT4, its emitter stage are connected with the outfan of amplifier P2
Connect；The outfan of described amplifier P2 as the outfan of this two-stage amplifying circuit and is connected with the NTC pin of control chip U1
Connect；The input of described two-stage amplifying circuit N pole with diode D1 after resistance R2 is connected.
A kind of High Accuracy Constant Temperature automatic control system based on two-stage amplifying circuit the most according to claim 2, its feature
It is: described triggering on-off circuit is connected with the colelctor electrode of audion VT2 by audion VT2, audion VT3, amplifier P, P pole
Connect, diode D3, P pole that N pole is connected with the colelctor electrode of audion VT3 is connected with the colelctor electrode of audion VT3, N pole with
The diode D4 that the cathode output end of diode rectifier U2 is connected, is serially connected in positive pole and the collection of audion VT3 of amplifier P
Resistance R6 between electrode, negative pole is connected with the CON pin of control chip U1, positive pole is connected with the negative pole of amplifier P
Electric capacity C2, and the resistance R7 composition being serially connected between the emitter stage of audion VT3 and the emitter stage of audion VT2；Described continue
Electrical equipment K is in parallel with diode D4；While the emitter stage of described audion VT2 is connected with the VSS pin of control chip U1
Ground connection；The base stage of described audion VT3 is connected with the outfan of amplifier P.
A kind of High Accuracy Constant Temperature automatic control system based on two-stage amplifying circuit the most according to claim 3, its feature
It is: described control chip U1 is the integrated chip of TC621.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546624.2A CN106054970A (en) | 2016-07-12 | 2016-07-12 | Automatic high precision constant temperature control system based on two-stage amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546624.2A CN106054970A (en) | 2016-07-12 | 2016-07-12 | Automatic high precision constant temperature control system based on two-stage amplification circuit |
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| Publication Number | Publication Date |
|---|---|
| CN106054970A true CN106054970A (en) | 2016-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610546624.2A Pending CN106054970A (en) | 2016-07-12 | 2016-07-12 | Automatic high precision constant temperature control system based on two-stage amplification circuit |
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| Country | Link |
|---|---|
| CN (1) | CN106054970A (en) |
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2016
- 2016-07-12 CN CN201610546624.2A patent/CN106054970A/en active Pending
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161026 |
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| WD01 | Invention patent application deemed withdrawn after publication |