CN106020280A - High precision constant temperature automatic control system based on buffer protection circuit - Google Patents
High precision constant temperature automatic control system based on buffer protection circuit Download PDFInfo
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- CN106020280A CN106020280A CN201610546021.2A CN201610546021A CN106020280A CN 106020280 A CN106020280 A CN 106020280A CN 201610546021 A CN201610546021 A CN 201610546021A CN 106020280 A CN106020280 A CN 106020280A
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- audion
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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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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Resistance Heating (AREA)
Abstract
The invention discloses a high precision constant temperature automatic control system based on a buffer protection 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 and the like. According to the invention, a TC621 integrated chip is combined with a peripheral circuit, so that a temperature signal can be well processed to improve the stability of the temperature signal; the TC621 integrated chip compares the temperature signal with the internal reference signal to accurately judge the temperature of the current environment; the work of the heater can be accurately controlled according to a judgment result, so as to improve the temperature control accuracy; the switching working condition of an electronic device can be improved; loss of the moment of power-on and power-off of the electronic device can be reduced; and the service life of the system is prolonged.
Description
Technical field
The present invention relates to automation field, specifically refer to a kind of High Accuracy Constant Temperature based on buffer protection circuit
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 High Accuracy Constant Temperature automatic control system based on buffer protection circuit.
The purpose of the present invention is by following technical proposals reality: a kind of high-accuracy and constant based on buffer protection circuit
Temperature automatic control system, mainly by transformator T, diode rectifier U2, control chip U1, temperature sensing
Device Q, audion VT1, heater M, P pole is connected with temperature sensor Q, N pole is through resistance R2
The diode D1 being connected with the NTC pin of control chip U1 afterwards, the N pole phase of one end and diode D1
The resistance R1 that connection, the other end are connected with the HS pin of control chip U1, one end is with diode D1's
The resistance R3 that N pole is connected, the other end is connected with the LS pin of control chip U1, is serially connected in control core
The collection of the resistance R4 between HL pin and the base stage of audion VT1 of sheet U1, negative pole and audion VT1
Electric capacity C1, the P pole that electrode is connected, positive pole is connected with the N pole of diode D1 is with audion VT1's
The diode D2 that emitter stage is connected, N pole is connected with the VSS pin of control chip U1, with control core
The triggering on-off circuit that sheet U1 is connected, the relay K being connected with triggering on-off circuit, and be serially connected in
Trigger the buffer protection circuit composition between on-off circuit and the cathode output end of diode rectifier U2；Described
The Same Name of Ends of the secondary inductance coil of transformator T is connected with the input of non-same polarity with 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 contact of relay K
After K-1, the non-same polarity with former limit inductance coil is connected；The cathode output end of described diode rectifier U2
It is connected with the N pole triggering on-off circuit and diode D1 respectively；Described triggering on-off circuit also with control
The VSS pin of chip U1 is connected；The N pole of described diode D1 also with the VDD of control chip U1
Pin is connected.
Further, 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 and amplifier P1
Negative pole be connected, P pole is as diode D5, the P pole of the input of this buffer protection circuit and diode
The diode D6 that the P pole of D5 is connected, N pole is connected with the grid of field effect transistor MOS, is serially connected in three
Resistance R9 between base stage and the colelctor electrode of pole pipe VT4, negative pole is connected with the emitter stage of audion VT4,
The electric capacity C3 that positive pole is connected with the negative pole of amplifier P2, is serially connected in drain electrode and the amplification of field effect transistor MOS
Resistance R10 between the positive pole of device P2, and negative pole is connected with the drain electrode of field effect transistor MOS, positive pole
The electric capacity C4 composition being connected with the outfan of amplifier P2；The plus earth of described amplifier P1, it is defeated
Go out end to be connected with the drain electrode of field effect transistor MOS；The base stage of described audion VT4 and field effect transistor MOS
Source electrode be connected, its grounded collector；The outfan of described amplifier P2 is as this buffer protection circuit
Outfan is also connected with the VSS pin of control chip U1；The input and two of described buffer protection circuit
The cathode output end of pole pipe commutator 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.
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.
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, P pole is connected with temperature sensor Q, N pole is through electricity
The diode D1 being connected with the NTC pin of control chip U1 after resistance R2, one end is with diode D1's
The resistance R1 that N pole is connected, the other end is connected with the HS pin of control chip U1, one end and diode
The resistance R3 that the N pole of D1 is connected, the other end is connected with the LS pin of control chip U1, is serially connected in
Resistance R4 between HL pin and the base stage of audion VT1 of control chip 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, with control
The triggering on-off circuit that chip U1 is connected, the relay K being connected with triggering on-off circuit, and concatenation
At the buffer protection circuit composition triggered between on-off circuit and the cathode output end of diode rectifier 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.
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, enables the integrated chip of TC621 preferably by temperature
Degree signal compares with the reference signal of its inside, judges the temperature conditions of current environment accurately, from
And make the present invention can control heater work accurately according to judged result, the most then can improve the present invention
Temperature control precision.Meanwhile, the present invention can improve the switch condition of electronic device, reduces electronics
The device loss when energising and shutdown transient, extends the service life 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 buffer protection circuit, it is characterised in that: main
By transformator T, diode rectifier U2, control chip U1, temperature sensor Q, audion VT1, add
Hot device M, P pole is connected with temperature sensor Q, N pole after resistance R2 with the NTC of control chip U1
The diode D1 that pin is connected, 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 other end and control
The resistance R3 that the LS pin of coremaking sheet U1 is connected, is serially connected in HL pin and three poles of control chip U1
Resistance R4 between the base stage of pipe VT1, negative pole is connected with the colelctor electrode of audion VT1, positive pole and two
Electric capacity C1, the P pole that the N pole of pole pipe D1 is connected is connected with the emitter stage of audion VT1, N pole with
The diode D2 that the VSS pin of control chip U1 is connected, the triggering being connected with control chip U1 is opened
Close circuit, the relay K being connected with triggering on-off circuit, and it is serially connected in triggering on-off circuit and two poles
Buffer protection circuit composition between the cathode output end of pipe commutator U2；The secondary inductance of described transformator T
The Same Name of Ends of coil is connected with the input of non-same polarity with diode rectifier U2；The former limit of transformator T
With former limit inductor wire after the normally opened contact K-1 of the Same Name of Ends of inductance coil sequentially heater via M and relay K
The non-same polarity of circle is connected；The cathode output end of described diode rectifier U2 respectively with trigger on-off circuit
It is connected with the N pole of diode D1；Described triggering on-off circuit also 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 based on buffer protection circuit the most according to claim 1 automatically controls and is
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 and amplifier P1
Negative pole be connected, P pole is as diode D5, the P pole of the input of this buffer protection circuit and diode
The diode D6 that the P pole of D5 is connected, N pole is connected with the grid of field effect transistor MOS, is serially connected in three
Resistance R9 between base stage and the colelctor electrode of pole pipe VT4, negative pole is connected with the emitter stage of audion VT4,
The electric capacity C3 that positive pole is connected with the negative pole of amplifier P2, is serially connected in drain electrode and the amplification of field effect transistor MOS
Resistance R10 between the positive pole of device P2, and negative pole is connected with the drain electrode of field effect transistor MOS, positive pole
The electric capacity C4 composition being connected with the outfan of amplifier P2；The plus earth of described amplifier P1, it is defeated
Go out end to be connected with the drain electrode of field effect transistor MOS；The base stage of described audion VT4 and field effect transistor MOS
Source electrode be connected, its grounded collector；The outfan of described amplifier P2 is as this buffer protection circuit
Outfan is also connected with the VSS pin of control chip U1；The input and two of described buffer protection circuit
The cathode output end of pole pipe commutator U2 is connected.
A kind of High Accuracy Constant Temperature based on buffer protection circuit the most according to claim 2 automatically controls and is
System, it is characterised in that: described triggering on-off circuit is by audion VT2, audion VT3, amplifier P, P
The diode that pole is connected with the colelctor electrode of audion VT2, N pole is connected with the colelctor electrode of audion VT3
D3, P pole is connected with the colelctor electrode of audion VT3, N pole exports with the positive pole of diode rectifier U2
The diode D4 that end is connected, is serially connected in the electricity between the positive pole of amplifier P and the colelctor electrode of audion VT3
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
Electric capacity C2, and be serially connected in the electricity between the emitter stage of audion VT3 and the emitter stage of audion VT2
Resistance R7 composition；Described relay K is in parallel with diode D4；The emitter stage of described audion VT2 with
The VSS pin of control chip U1 be connected while ground connection；The base stage of described audion VT3 and amplifier
The outfan of P is connected.
A kind of High Accuracy Constant Temperature based on buffer protection circuit the most according to claim 3 automatically controls and is
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 |
|---|---|---|---|
| CN201610546021.2A CN106020280A (en) | 2016-07-12 | 2016-07-12 | High precision constant temperature automatic control system based on buffer protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610546021.2A CN106020280A (en) | 2016-07-12 | 2016-07-12 | High precision constant temperature automatic control system based on buffer protection circuit |
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|---|---|
| CN106020280A true CN106020280A (en) | 2016-10-12 |
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|---|---|---|---|
| CN201610546021.2A Pending CN106020280A (en) | 2016-07-12 | 2016-07-12 | High precision constant temperature automatic control system based on buffer protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107783565A (en) * | 2017-11-23 | 2018-03-09 | 深圳佳莱知家科技有限公司 | A kind of Intelligent temperature-control mattress |
-
2016
- 2016-07-12 CN CN201610546021.2A patent/CN106020280A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107783565A (en) * | 2017-11-23 | 2018-03-09 | 深圳佳莱知家科技有限公司 | A kind of Intelligent temperature-control mattress |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20161012 |
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| WD01 | Invention patent application deemed withdrawn after publication |