CN102436272B - Temperature control system - Google Patents
Temperature control system Download PDFInfo
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- CN102436272B CN102436272B CN201110369027.4A CN201110369027A CN102436272B CN 102436272 B CN102436272 B CN 102436272B CN 201110369027 A CN201110369027 A CN 201110369027A CN 102436272 B CN102436272 B CN 102436272B
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Abstract
The invention discloses a temperature control system. The temperature control system comprises a temperature error acquisition unit, a heating unit, a pulse width modulating unit, a power switch unit and an energy storage unit, wherein the temperature error acquisition unit is used for acquiring the temperature of the external environment and calculating the difference value between the temperature of the external environment and an anticipated temperature; the heating unit is used for heating the external environment; the pulse width modulating unit is used for outputting a pulse signal; the power switch unit is used for outputting electric energy based on the pulse width of the pulse signal; the energy storage unit is used for storing the electric energy and continuously outputting the electric energy to the heating unit; the pulse width modulating unit is used for adjusting the pulse width of the output pulse signal based on the difference value and voltage or current output by the energy storage unit; and the energy storage unit is used for storing the electric energy output by the power switch unit. The temperature control system stores the electric energy output by the power switch unit through the energy storage unit and continuously outputs the electric energy to the heating unit so as to supply power continuously for the heating unit and reduce the power loss of the power switch.
Description
Technical field
The present invention relates to a kind of temperature control system, particularly relate to a kind of temperature control system for microwave cavity.
Background technology
Current ubiquitous two kinds of temperature control modes: ratio control mode and ratio, integration, differential (PID) control mode.Ratio control mode implementation method is simple, and debugging is convenient, use in a large number at home, but it has the shortcoming that temperature control residual error is large and be subject to influence of temperature change; Pid control mode is realized complicated, debug difficulties, but it has temperature control, residual error is little, the feature that stability is high.
Ratio control mode is input to microvolt amplifier temperature error by electric bridge, then by centre, amplify and power amplification, thereby heat by heater strip, because the DC current gain of first order microvolt amplifier is limited, control residual error is large, is subject to extraneous thermal effect larger.So in pid control mode, temperature error is input to proportional integral amplifying circuit by electric bridge, owing to introducing integration, amplifier DC current gain is becoming tight in infinity, temperature control residual error is little like this, then by power amplification, exports to heater strip.
But the power output stage of temperature-control circuit generally only adopts linear amplifier circuit at present, such as power amplification applied power switching tube, then it is directly fitted on heater block, thereby utilize the heat of self to heat simultaneously, thereby improve temperature control efficiency, but this mode use occasion is limited, some microwave cavity, the singularity of passive-type Hydrogen Atom Frequency Standard microwave cavity for example, so linear amplifier circuit can not directly be fitted on microwave cavity, therefore thermal losses can not utilize, so cannot improve temperature control efficiency.
And because power switch pipe as power output stage etc. is exported a section electric energy by the mode of opening and closing to heater block, so under the situation of temperature stabilization, described power switch pipe closure time reduces, so the power attenuation of power switch closure is very large.
Summary of the invention
The technical problem to be solved in the present invention is in order to overcome the very large defect of thermal losses power attenuation high and that power switch is closed in the temperature-control circuit of prior art, a kind of temperature control system is provided, pass through energy-storage units, reduce the power attenuation of power switch closure, improved the utilization factor of output power.
The present invention solves above-mentioned technical matters by following technical proposals:
The invention provides a kind of temperature control system, comprise a temperature error collecting unit, for gathering the temperature of external environment condition and calculating the temperature of described external environment condition and the difference of a desired temperature; One heating unit, for heating external environment condition; One pwm unit, for output pulse signal; One power switch unit, for the pulse width output electric energy based on described pulse signal; Be characterized in that described temperature control system also comprises an energy-storage units, for storage of electrical energy and to described heating unit, export continuously electric energy; The pulse width of wherein said pwm unit based on described difference and the voltage of described energy-storage units output or the pulse signal of electric current regulation output; Described energy-storage units is stored the electric energy of described power switch unit output.
Preferably, described temperature error collecting unit also comprises an amplification module, for amplifying described difference; The pulse width of the pulse signal of the electric energy regulation output of the described difference of described pwm unit based on after amplifying and the output of described energy-storage units.
Preferably, described temperature error collecting unit also comprises that a vibration suppresses module, for the vibration that suppresses to produce when described amplification module amplifies described difference.
Preferably, described vibration inhibition module is a differentiating circuit.
Preferably, described amplification module is an integrating circuit.
Preferably, described temperature control system also comprises a filter unit, for described energy-storage units being transported to the electric energy of described heating unit, carries out filtering.
Preferably, described filter unit comprises an electrochemical capacitor.
Preferably, described filter unit comprises by two the first capacitance group and the second capacitance group that electrochemical capacitor is in series, described the first capacitance group and the second Capacitance parallel connection.
Preferably, described power switch unit is a power switch pipe.
Preferably, described energy-storage units is an energy storage inductor.
Preferably, described heating unit is a resistance wire.。
Positive progressive effect of the present invention is:
Temperature control system of the present invention is stored the electric energy of described power switch output by energy-storage units, and continuous output electric energy is to heating unit, thereby can be continuously heating unit power supply, and energy-storage units has also reduced the number of times that power switch is opened completely, thereby reduced the power attenuation of power switch.
In addition pwm unit of the present invention, voltage based on described energy-storage units output or electric current be Modulating Power switch open or closed time dynamically, thereby optimized the output power of power switch, optimized the time of the output electric energy of power switch, thereby but also make described power switch within a recurrence interval, not open saving power, also improved further the utilization factor of output power.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of temperature control system of the present invention.
Fig. 2 is the circuit diagram of the second embodiment of temperature control system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, provide preferred embodiment of the present invention, to describe technical scheme of the present invention in detail.
The first embodiment:
As shown in Figure 1, the temperature control system of the present embodiment is for controlling the temperature of resonator cavity, and wherein said temperature control system comprises a temperature error collecting unit 1, a pwm unit 2, a power switch unit 3, an energy-storage units 4, a heating unit 5 and a filter unit 6.
Wherein said temperature error collecting unit 1 is for gathering the temperature of resonator cavity, and calculates temperature T in described resonator cavity and a default desired temperature T
thresholddifference DELTA T.Wherein technician can be according to the described desired temperature T of need to arranging of temperature in resonator cavity
threshold.
And in the described temperature error collecting unit 1 of the present embodiment, also comprise that an amplification module 11 and a vibration suppress module 12, wherein said amplification module is for amplifying described difference DELTA T, the difference DELTA T gathering due to described temperature error collecting unit 1 is often very little, so for unit in rear class can effectively be applied described difference DELTA T, so the difference DELTA T that need to gather by 11 pairs of described temperature error collecting units 1 of described amplification module amplifies.
In addition described vibration suppresses the vibration of module 12 for suppressing to produce when described amplification module 11 amplifies described difference DELTA T.Because signal in signal amplification process easily produces concussion, thereby cause the unstable of whole system, so the present embodiment suppresses by adding to vibrate the concussion that module 12 suppresses in described signal, thereby safeguarded the stability of system.
The pulse width W that the voltage U of the pwm unit 2 of the present embodiment based on described difference DELTA T and 4 outputs of described energy-storage units regulates the pulse signal of himself exporting, adjusts the dutycycle in pulse signal one-period.Thereby can adjust dynamically the pulse width W of pulse signal according to described energy-storage units 4 outputs, thereby realize the accurate control to power switch unit 3, thereby improve the utilization factor of power switch unit 3, reduce the loss of power.
The pulse width W output electric energy of the described power switch unit 3 of the present embodiment based on described pulse signal, be that dutycycle in described pulse signal one-period has determined that described power switch unit 3 is closed and to the unit output power of rear class, therefore described pwm unit 2 can be controlled the amount of electric energy that described power switch unit 3 exports the unit of rear class to by adjusting the pulse width W of described pulse signal.
Described energy-storage units 4 is for storing the electric energy of described power switch unit 3 outputs and exporting constantly electric energy to described heating unit 5.Because described power switch unit 3 only has part-time output power in pulse signal one-period, so power switch unit 3 is with sectional formal output electric energy, the electric energy of the described sectional form of energy-storage units 4 storage of the present embodiment is also exported electric energy to described heating unit 5 in the mode of continuous wave output.
In addition the filter unit 6 of the present embodiment is for the electric energy of described energy-storage units 4 outputs is carried out to filtering, thus undesired signal wherein of filtering or noise etc., thus obtain pure electric energy output.The electric energy of described heating unit 5 based on filter unit 6 outputs heats described resonator cavity.
The principle of work of the present embodiment is as follows:
Described temperature error collecting unit 1 gather temperature T in resonator cavity and with desired temperature T
thresholdcalculate difference DELTA T, 11 couples of described difference DELTA T of wherein said amplification module amplify, and meanwhile described vibration suppresses the concussion that module 12 suppresses in 11 pairs of described difference DELTA T amplification process of described amplification module.
Then the voltage U that described pwm unit 2 exports described heating unit 5 to based on described difference DELTA T and described energy-storage units 4 regulates the pulse width W of the pulse signal of himself output.
After this pulse width W of described power switch unit 3 based on described pulse signal is with sectional formal output electric energy and be stored to described energy-storage units 4.Described energy-storage units 4 is exported electric energy continuously to described heating unit 5.
The electric energy that 6 pairs of described energy-storage units 4 of last described filter unit export described heating unit 5 to carries out filtering, and then 5 pairs of described resonator cavitys of described heating unit heat.
The present embodiment is by the electric energy of described power switch unit 3 outputs of energy-storage units 4 storage, and export continuously electric energy to heating unit 5, thereby when the dutycycle of described pwm unit 2 output pulses is lower, can reduce the number of times of the completely closed output electric energy of described power switch unit 3, so reduced the power attenuation of power switch, saved the output of power.
The second embodiment:
As shown in Figure 2, the temperature control system of the present embodiment is identical with the structure of the temperature control system of the first embodiment, comprises equally a temperature error collecting unit 1, a pwm unit 2, a power switch unit 3, an energy-storage units 4, a heating unit 5 and a filter unit 6.Wherein said temperature error collecting unit 1 comprises that an amplification module 11 and a vibration suppress module 12.
Wherein the collecting unit of temperature error described in the present embodiment 1 comprises a bridge diagram, and by Heater1 and Heater2, gather respectively the voltage that is arranged in resonator cavity thermistor (Fig. 2 does not show) two ends, detect the resistance value of described thermistor, when the resistance value of described thermistor has been destroyed the balance of bridge diagram, be in described resonator cavity temperature from a desired temperature when different, the output voltage of bridge diagram output terminal changes, and the input voltage of the reverse input end of operational amplifier U1 changes.So the voltage of exporting by described bridge diagram has reflected temperature in resonator cavity and difference between desired temperature.
Described amplification module 11 comprises the proportional integral circuit consisting of operational amplifier U1, resistance R 5 and capacitor C 1, because the DC current gain convergence of described proportional integral circuit is infinitely great, so also effectively eliminated temperature control residual error when realizing the output amplification of described bridge diagram.In addition technician can also need and the other forms of integrating circuit of requirement employing according to actual design.
In addition described vibration suppresses module 12 and comprises the differentiating circuit consisting of operational amplifier U1, resistance R 26 and capacitor C 6.During due to amplification module 11 adoption rate integrating circuit, can make the unstable of whole temperature control system, thus by differentiating circuit, improve system dynamic characteristic, thus realize the effect that suppresses system oscillation.In addition technician can also need and the other forms of differentiating circuit of requirement employing according to actual design.
Described pwm unit 2 comprises a totalizer and a PWM chip U4 (pulse width modulating chip).Wherein described totalizer consists of an operational amplifier U2A and resistance R 11, R12, R13 and R14 as shown in Figure 2, the output of described totalizer based on proportional integral circuit and the output of energy-storage units 4, i.e. V in Fig. 2
out, additional calculation change the input to described PWM chip U4, thereby change further the output pulse width of described PWM chip U4, thereby realize the modulation of output pulse width, change the dutycycle in output pulse one-period.
Described power switch unit 3 comprises a power switch pipe Q6, and the present embodiment is realized with sectional mode output power by conducting and the cut-off of described power switch pipe Q6, exports electric energy.In described power switch unit 3, also comprise that a triode Q5 accelerates the process of described power switch pipe Q6 closure or openness, improve the efficiency of output power.
Described energy-storage units 4 is an energy storage inductor L1, stores the power of described power switch pipe Q6 output by described energy storage inductor L1.
Described filter unit 6 consists of electrochemical capacitor C4_1, C4_2, C4_3 and C4_4, thus the interference in energy storage inductor L1 output electric energy or noise etc. described in filtering.In addition technician can also need and require the structure of described electrochemical capacitor is changed according to actual design, such as being reduced to an electrochemical capacitor etc.
And described energy storage inductor L1 and electrochemical capacitor C4_1, C4_2, C4_3 and C4_4 and diode D1 is common forms a chopper circuit, thereby realized further the continuous wave output of electric energy.
As shown in Figure 2, described energy storage inductor L1 is by output V
outto a resistance wire, described resistance wire forms described heating unit 5.Wherein said resistance wire heats described resonator cavity, thereby realize, the temperature of resonator cavity is controlled.
The principle of work of the present embodiment is as follows:
First by described bridge diagram, detect the variation of the resistance between described Heater1 and Heater2, by described bridge diagram, obtain the difference between described resonance cavity temperature and preset temperature, by the output voltage corresponding to described difference, the proportional integral circuit by operational amplifier U1, resistance R 5 and capacitor C 1 amplifies described bridge diagram, and the differentiating circuit meanwhile consisting of operational amplifier U1, resistance R 26 and capacitor C 6 suppresses the concussion that described integrating circuit produces system.
Then described proportional integral circuit carries out level conversion by triode Q1, thereby further by totalizer additive operation, controls the pulse width of described PWM chip U4 output.
After this pass through triode Q2 and triode Q4 level conversion, thereby control the switch of triode Q5, described triode Q5 is used for controlling the switch of described power switch pipe Q6, thereby realizes power with sectional formal output.
Then by the energy storage inductor L1 store electrical energy of chopper circuit, then through electrochemical capacitor C4_1, C4_2, C4_3 and C4_4, energy storage inductor L1 is exported to electric energy continuously and carry out filtering, and export resistance wire to, thereby make resistance wire heat release.
The pulse width of PWM chip output is adjusted in the output of totalizer described in the present embodiment based on energy-storage units 4, so optimized the output power of power switch, optimized the time of the output electric energy of power switch, and energy-storage units has also reduced the number of times that power switch is opened completely, thereby reduced the power attenuation of power switch, and can be continuously heating unit power supply.
And the energy-storage units 4 of the present embodiment is exported a section electric energy of power switch pipe output in a continuous manner, so when the dutycycle of output pulse hour, can, so that thereby described power switch is not opened saving power within a recurrence interval, reduce the power attenuation of power switch pipe.So improved the utilization factor of output power.
Although more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is limited by appended claims.Those skilled in the art is not deviating under the prerequisite of principle of the present invention and essence, can make various changes or modifications to these embodiments, but these changes and modification all fall into protection scope of the present invention.
Claims (11)
1. a temperature control system, for microwave cavity, comprising: a temperature error collecting unit, for gathering the temperature of microwave cavity and calculating the temperature of described microwave cavity and the difference of a desired temperature; One heating unit, for heating microwave cavity; One pwm unit, for output pulse signal; One power switch unit, for the pulse width output electric energy based on described pulse signal;
It is characterized in that, described temperature control system also comprises:
One energy-storage units, exports electric energy continuously for storage of electrical energy and to described heating unit;
The pulse width of wherein said pwm unit based on described difference and the voltage of described energy-storage units output or the pulse signal of electric current regulation output; Described energy-storage units is stored the electric energy of described power switch unit output.
2. temperature control system as claimed in claim 1, is characterized in that, described temperature error collecting unit also comprises an amplification module, for amplifying described difference; The pulse width of the pulse signal of the electric energy regulation output of the described difference of described pwm unit based on after amplifying and the output of described energy-storage units.
3. temperature control system as claimed in claim 2, is characterized in that, described temperature error collecting unit also comprises that a vibration suppresses module, for the vibration that suppresses to produce when described amplification module amplifies described difference.
4. temperature control system as claimed in claim 3, is characterized in that, it is a differentiating circuit that described vibration suppresses module.
5. temperature control system as claimed in claim 2, is characterized in that, described amplification module is an integrating circuit.
6. temperature control system as claimed in claim 1, is characterized in that, described temperature control system also comprises a filter unit, for described energy-storage units being transported to the electric energy of described heating unit, carries out filtering.
7. temperature control system as claimed in claim 6, is characterized in that, described filter unit comprises an electrochemical capacitor.
8. temperature control system as claimed in claim 6, is characterized in that, described filter unit comprises by two the first capacitance group and the second capacitance group that electrochemical capacitor is in series, described the first capacitance group and the second Capacitance parallel connection.
9. the temperature control system as described in any one in claim 1-8, is characterized in that, described power switch unit is a power switch pipe.
10. temperature control system as claimed in claim 9, is characterized in that, described energy-storage units is an energy storage inductor.
11. temperature control systems as claimed in claim 10, is characterized in that, described heating unit is a resistance wire.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110369027.4A CN102436272B (en) | 2011-11-18 | 2011-11-18 | Temperature control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110369027.4A CN102436272B (en) | 2011-11-18 | 2011-11-18 | Temperature control system |
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| CN102436272A CN102436272A (en) | 2012-05-02 |
| CN102436272B true CN102436272B (en) | 2014-02-05 |
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| JP5845347B2 (en) * | 2012-06-22 | 2016-01-20 | 下西技研工業株式会社 | Double feed detection device and sheet-like material handling device |
| CN103853208A (en) * | 2012-12-06 | 2014-06-11 | 苏州工业园区新宏博通讯科技有限公司 | Heating circuit capable of controlling temperature automatically |
| EP3226098B1 (en) * | 2014-11-26 | 2019-01-02 | U-MHI PLATECH Co., Ltd. | Temperature control method and temperature control device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2283881Y (en) * | 1996-08-06 | 1998-06-10 | 清华大学 | Temp controller using pulsewidth modulated |
| CN101980435A (en) * | 2010-04-20 | 2011-02-23 | 陈浩 | Direct current/alternating-current converter for acquiring stable low voltage and telephone power supply circuit |
| CN102176177A (en) * | 2009-10-24 | 2011-09-07 | 佛山市顺德区汉达精密电子科技有限公司 | Device heating method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI363957B (en) * | 2008-05-26 | 2012-05-11 | Pegatron Corp | Method for protecting data in non-volatile storage device and computer thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2283881Y (en) * | 1996-08-06 | 1998-06-10 | 清华大学 | Temp controller using pulsewidth modulated |
| CN102176177A (en) * | 2009-10-24 | 2011-09-07 | 佛山市顺德区汉达精密电子科技有限公司 | Device heating method |
| CN101980435A (en) * | 2010-04-20 | 2011-02-23 | 陈浩 | Direct current/alternating-current converter for acquiring stable low voltage and telephone power supply circuit |
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