CN1375672A - Thermoelectronic refrigerator controlling method and circuit - Google Patents
Thermoelectronic refrigerator controlling method and circuit Download PDFInfo
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- CN1375672A CN1375672A CN 01108138 CN01108138A CN1375672A CN 1375672 A CN1375672 A CN 1375672A CN 01108138 CN01108138 CN 01108138 CN 01108138 A CN01108138 A CN 01108138A CN 1375672 A CN1375672 A CN 1375672A
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Abstract
The present invention relates to a control method of thermal electric refrigerator and its circuit. It is characterized by that after the feedback temp. value and preset temp. value are used to make PID calculation, a pulse duration modulating circuit is used to modulate and form a square-wave with a certain duty ratio to control high-frequency switch voltage-regulating circuit so as to make D.C power supply pass through the high-frequency switch voltage-regulating circuit to output a D.C voltage which can be changed continuously with duty ratio, then the D.C. voltage is passed through the H-type electronic current inverter to supply power for thermal electric refrigerator. Said invention is high in control accuracy, low in cost, and can raise the reliability of inverter and prolong the service life of the thermal electric refrigerator.
Description
The present invention relates to a kind of thermoelectric refrigerating unit, be specifically related to a kind of by control reaches temperature controlled method and circuit thereof to the power of thermoelectric refrigerating unit.
Thermoelectric refrigerating unit claims semiconductor cooler again.When direct current passes through the loop of two kinds of different conductive materials, will produce the neither endothermic nor exothermic phenomenon on the node, be called peltier effect.Thermoelectric refrigerating unit promptly is to have utilized peltier effect to realize refrigeration or to heat that it has refrigeration, the speed that heats is fast, and noiseless is pollution-free, freezes, heats plurality of advantages such as control is flexible, volume is little, in light weight, thereby obtained extensive utilization.Utilize thermoelectric refrigerating unit refrigeration, heat conversion and realize temperature control, gordian technique is to reach temperature controlling by power control, simultaneously, utilizes big electric current to commutate to control refrigeration or heats.Present widely used Poewr control method is that passing ratio integral differential (PID) mode of regulating turns on and off refrigerator and controls its heat production to reach predetermined temperature, this mode temperature control precision is not high, and to the frequent problem that commutates of corresponding electronic current commutator existence, cause the reliability requirement of commutator higher, simultaneously in frequent electric current commutation, the serviceable life of having reduced thermoelectric refrigerating unit; Big electric current reversing mode commonly used has the negative and positive dual power of employing and thyristor controlled H type electronic current commutator, though adopt the negative and positive dual power mode fairly simple, but to having relatively high expectations of power supply, thereby the volume and the weight of power supply have been increased, cost is also higher, the H type electronic current commutator that utilizes four gate turn-off thyristors to realize, requirement to power supply is lower, but because the control signal of gate turn-off thyristor must be the positive negative bipolar signal, controllable silicon is a current control device in addition, require driving circuit that bigger power drive ability is arranged, therefore cause the control Driver Circuit complexity, make total system reliability variation.Therefore, need the power control circuit and the corresponding electric current reversing mode of thermoelectric refrigerating unit be improved, to realize accuracy control over temperature, improve the reliability and the serviceable life of system simultaneously, particularly in bioengineering field, extremely important meaning is arranged for the temperature control of miniature incubator.
The object of the invention provides a kind of control method and circuit thereof of thermoelectric refrigerating unit, can reach more accurate temperature control by the power control to thermoelectric refrigerating unit.
For achieving the above object, the technical solution used in the present invention is: a kind of control method of thermoelectric refrigerating unit, undertaken after proportion integration differentiation (PID) calculates by temperature value the feedback of temperature and setting, utilize a pulse-width modulation circuit to be modulated into the square wave of certain dutycycle, control HF switch regulating circuit, make direct supply behind the HF switch regulating circuit, export one, power to thermoelectric refrigerating unit through H type electronic current commutator with dutycycle continually varying DC voltage.
Realize the control circuit of the thermoelectric refrigerating unit of said method, comprise direct supply, H type electronic current commutator and driving circuit thereof, also include microprocessor, temperature sensing circuit, pulse-width modulation circuit and HF switch regulating circuit, described microprocessor carries out proportion integration differentiation (PID) calculating to the temperature signal and the preset temperature value that obtain by temperature sensing circuit, its output is connected to pulse-width modulation circuit, the square-wave signal output terminal of pulse-width modulation circuit is connected with the HF switch regulating circuit, direct supply is connected with thermoelectric controller by H type electronic current commutator after pressure regulation.
In the technique scheme, described " H type electronic current commutator " can be commutator of the prior art, mainly be to drive by driving circuit, make commutator provide forward or backwards DC voltage, the purpose that reaches refrigeration or heat to thermoelectric refrigerating unit according to control signal; Temperature that is obtained according to sensing by microprocessor and preset temperature poor utilizes the PID method to calculate, and determines the output voltage of HF switch regulating circuit with required quantity of heat production, thereby can control temperature preferably, avoids the frequent commutation of electronic current commutator.
In the technique scheme, can be connected by photoelectrical coupler between described pulse-width modulation circuit and HF switch regulating circuit.
In the technique scheme, described H type electronic current commutator is made up of four power metal-oxide field effect transistor (MOSFET); The driving circuit of described H type electronic current commutator is connected with an output port of microprocessor, provides commutation signal by microprocessor.
When adopting four MOS field effect tubes among the present invention, can play best effect, MOS field effect tube has following characteristics: (1) is because the grid great majority are insulated-gate type, grid and drain electrode and source electrode insulate fully, so have very high input impedance, require the power of driving circuit little, be convenient to interpolar and directly be coupled; (2) metal-oxide-semiconductor field effect transistor is a voltage control device, and the unipolar voltage signal is the may command break-make, and driving circuit is simple; (3) have positive temperature coefficient, be convenient to parallel connection; (4) switching speed height; (5) current capacity is big, conducting resistance is low, blocking voltage is high.Thereby the driving circuit of the H type electronic current commutator of four MOS field effect tubes of employing is simple, and capacity is big, and loss is little, and cost is low, and has improved the reliability of work greatly.
Because the technique scheme utilization, the present invention compared with prior art has following advantage:
1, because the present invention by the control of supply voltage being realized the power control to thermoelectric refrigerating unit, and then realizes temperature control, thereby can measure according to Temperature Feedback real-time regulated heat production (refrigeration), temperature control precision is higher.
2, because the use of said structure of the present invention makes the electronic current commutator not need frequent commutation, improve the reliability of commutator, also prolonged the serviceable life of thermoelectric refrigerating unit.
3, the present invention makes that the driving circuit of H type electronic current commutator is simple when adopting four MOS field effect tubes to form H type electronic current commutator, and capacity is big, and loss is little, and cost is low, and has improved the reliability of work greatly.
Accompanying drawing 1 is the control circuit block diagram of the embodiment of the invention one;
Accompanying drawing 2 is the circuit diagram of pulse-width modulation circuit among the figure one, HF switch regulating circuit and H type electronic current commutator.
Wherein: [1], thermoelectric refrigerating unit.
Below in conjunction with drawings and Examples the present invention is further described:
Embodiment one: shown in accompanying drawing 1 and accompanying drawing 2, a kind of control circuit of thermoelectric refrigerating unit, comprise direct supply, H type electronic current commutator and driving circuit thereof, also include microprocessor, temperature sensing circuit, pulse-width modulation circuit and HF switch regulating circuit, described microprocessor carries out proportion integration differentiation (PID) calculating to the temperature signal and the preset temperature value that obtain by temperature sensing circuit, its output is connected to pulse-width modulation circuit, the square-wave signal output terminal of pulse-width modulation circuit is connected with the HF switch regulating circuit by photoelectrical coupler IC2, direct supply is connected with thermoelectric controller 1 by H type electronic current commutator after pressure regulation; Described H type electronic current commutator is made up of four power metal-oxide field effect transistor (MOSFET) M1, M2, M3, M4; The driving circuit of H type electronic current commutator is connected with an output port of microprocessor, provides commutation signal by microprocessor.
In the present embodiment, shown in accompanying drawing 2, described pulse-width modulation circuit can adopt a TL494 integrated circuit, import 4 pin of TL494 by the pulse-width signal of microprocessor generation, be composed in series output loop by resistance R 2, R14 and photoelectrical coupler IC2,8 pin of TL494 are connected with the tie point place of resistance R 2, R14 with 11 pin, resistance R 14 and optocoupler IC2 are access in or short circuit according to the break-make of signal, thereby export a square-wave signal by microprocessor certain dutycycle of control after PID calculates; Described HF switch regulating circuit can comprise a metal-oxide-semiconductor field effect transistor M5, the output of optocoupler IC2 is behind field effect transistor M5, export a high-frequency signal, by inductance L 1 energy storage, fast recovery diode D1 afterflow, and electric capacity E1, C1 filtering after obtain a DC voltage relevant with the square-wave signal dutycycle; Described H type electronic current commutator is made up of four metal-oxide-semiconductor field effect transistor M1, M2, M3, M4, when driving circuit provides when heating signal, field effect transistor M2, M4 conducting, M1, M3 end, on thermoelectric refrigerating unit 1, be added with a b for just, a is negative DC voltage, thermoelectric refrigerating unit makes in the container and heats, when driving circuit provides the refrigeration signal, field effect transistor M1, M3 conducting, M2, M4 end, DC voltage on thermoelectric refrigerating unit 1 is reverse, become a for just, b is for negative, at this moment, thermoelectric refrigerating unit 1 makes the container refrigeration.
The thermoelectric refrigerating unit control circuit of present embodiment is particularly suitable for preparing the miniature incubator that bioengineering uses.In bioengineering, often need carry out the cultivation test under the uniform temperature curve condition to the sample of short run, at this moment, control accuracy of temperature is had relatively high expectations.Adopt miniature incubator of the present invention, can in little space, obtain more accurate temperature control, simultaneously, because the present invention has adopted microprocessor, storage temperature control requirement at times in microprocessor simultaneously in example, thereby more convenient the temperature control that has obtained set point of temperature curve condition.
Claims (5)
1, a kind of control method of thermoelectric refrigerating unit, it is characterized in that: undertaken after proportion integration differentiation (PID) calculates by temperature value to the feedback of temperature and setting, utilize a pulse-width modulation circuit to be modulated into the square wave of certain dutycycle, control HF switch regulating circuit, make direct supply behind the HF switch regulating circuit, export one, power to thermoelectric refrigerating unit through H type electronic current commutator with dutycycle continually varying DC voltage.
2, realize the control circuit of the thermoelectric refrigerating unit of the described method of claim 1, comprise direct supply, H type electronic current commutator and driving circuit thereof, it is characterized in that: also include microprocessor, temperature sensing circuit, pulse-width modulation circuit and HF switch regulating circuit, described microprocessor carries out proportion integration differentiation (PID) calculating to the temperature signal and the preset temperature value that obtain by temperature sensing circuit, its output is connected to pulse-width modulation circuit, the square-wave signal output terminal of pulse-width modulation circuit is connected with the HF switch regulating circuit, direct supply is connected with thermoelectric controller [1] by H type electronic current commutator after pressure regulation.
3, control circuit as claimed in claim 2 is characterized in that: be connected by photoelectrical coupler [IC2] between described pulse-width modulation circuit and HF switch regulating circuit.
4, control circuit as claimed in claim 2 is characterized in that: described H type electronic current commutator is made up of four power metal-oxide field effect transistor (MOSFET) [M1, M2, M3, M4].
5, as claim 2 or 4 described control circuits, it is characterized in that: the driving circuit of described H type electronic current commutator is connected with an output port of microprocessor, provides commutation signal by microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108138 CN1375672A (en) | 2001-03-15 | 2001-03-15 | Thermoelectronic refrigerator controlling method and circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01108138 CN1375672A (en) | 2001-03-15 | 2001-03-15 | Thermoelectronic refrigerator controlling method and circuit |
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| Publication Number | Publication Date |
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| CN1375672A true CN1375672A (en) | 2002-10-23 |
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| CN 01108138 Pending CN1375672A (en) | 2001-03-15 | 2001-03-15 | Thermoelectronic refrigerator controlling method and circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539459B (en) * | 2009-04-28 | 2011-04-06 | 中国重型机械研究院有限公司 | Temperature detection and control system of medium frequency hydraulic pipe bender |
| CN102721243A (en) * | 2011-03-31 | 2012-10-10 | 中国科学院西安光学精密机械研究所 | Single chip computer-based multi-TEC (Thermoelectric Cooler) temperature-regulated control system |
| CN103592977A (en) * | 2013-11-22 | 2014-02-19 | 长春长光思博光谱技术有限公司 | PWM temperature controller for electrical detection system |
| CN106274361A (en) * | 2016-08-27 | 2017-01-04 | 重庆瑞阳科技股份有限公司 | A kind of air-conditioning heating control method for electric automobile and system |
| CN107817850A (en) * | 2017-12-05 | 2018-03-20 | 苏州昊通仪器科技有限公司 | PCR instrument temperature control system |
-
2001
- 2001-03-15 CN CN 01108138 patent/CN1375672A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539459B (en) * | 2009-04-28 | 2011-04-06 | 中国重型机械研究院有限公司 | Temperature detection and control system of medium frequency hydraulic pipe bender |
| CN102721243A (en) * | 2011-03-31 | 2012-10-10 | 中国科学院西安光学精密机械研究所 | Single chip computer-based multi-TEC (Thermoelectric Cooler) temperature-regulated control system |
| CN102721243B (en) * | 2011-03-31 | 2015-03-11 | 中国科学院西安光学精密机械研究所 | Single chip computer-based multi-TEC (Thermoelectric Cooler) temperature-regulated control system |
| CN103592977A (en) * | 2013-11-22 | 2014-02-19 | 长春长光思博光谱技术有限公司 | PWM temperature controller for electrical detection system |
| CN106274361A (en) * | 2016-08-27 | 2017-01-04 | 重庆瑞阳科技股份有限公司 | A kind of air-conditioning heating control method for electric automobile and system |
| CN107817850A (en) * | 2017-12-05 | 2018-03-20 | 苏州昊通仪器科技有限公司 | PCR instrument temperature control system |
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