CN104816882A - Variable frequency control system of water-cooled semiconductor refrigeration fruit/vegetable freshness preservation tank - Google Patents
Variable frequency control system of water-cooled semiconductor refrigeration fruit/vegetable freshness preservation tank Download PDFInfo
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Abstract
The invention discloses a variable frequency control system of a water-cooled semiconductor refrigeration fruit/vegetable freshness preservation tank. The variable frequency control system uses an ARM as a control chip, comprises a temperature sensor transfer circuit, a relative humidity sensor driving circuit, a semiconductor refrigeration chip control circuit, a radiating fan control circuit, a refrigeration fan control circuit, a water pump control circuit, a display screen driving circuit, a prompt circuit, a key control circuit and a power supply conversion circuit, and realizes the control system touch screen control, the temperature control object selection, the refrigeration chip PID control, the water pump PID control, the radiating fan classification control, the cold-end fan classification control, the in-tank temperature field detecting control, the in-tank humidity detecting function and the alarming function setting. The variable frequency control system overcomes such defects as extensive control, high energy consumption, high temperature overshoot and large temperature difference in a traditional semiconductor refrigeration freshness preservation tank control system.
Description
Technical field
The present invention relates to the technical field of preserving fruit and vegetable utilizing storing, refer in particular to a kind of water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system.
Background technology
China is in fruit and vegetable storage and transportation process, and control temperature is most effective method.Fresh-keeping environments temperature often raises 10 DEG C, and the physiological reaction of fruits and vegetables increases by 2 ~ 3 times.Domestic shortage carries out equipment optimization for fruits and vegetables transport, simultaneously because refrigeration can produce energy consumption, increases storing cost, in fruits and vegetables cold chain process, disconnected cold phenomenon often can occur.The control method of the domestic on-off formula generally adopted, temperature controls extensive, and overshoot is large, and temperature fluctuation is large, and energy consumption is high.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide that a kind of refrigerating capacity is controlled, temperature-controllable, temperature fluctuation are little, the water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system of low energy consumption.
For achieving the above object, technical scheme provided by the present invention is: a kind of water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system, take ARM as control chip, realize the control of control system touch screen, temperature control Object Selection, semiconductor chilling plate PID control, water pump P ID control, cooling fan step control, cold junction blower fan step control, the temperature inside the box field detection control, case humidity measuring ability, alarm function setting according to control system flow process; Include:
Temperature sensor transmission circuit, for gathering in the cold junction temperature of antistaling box, hot-side temperature, case rear part temperature and ambient temperature signal in anterior temperature, case, become and send as voltage analog signal, pass to ADC, realize ARM control chip and collecting sensor signal;
Relative humidity sensor driving circuit, being SHT15 humiture one digital sensor driving circuit, for obtaining relative humidity information in case, realizing ARM control chip and sensor communication;
Semiconductor chilling plate control circuit is the semiconductor chilling plate PWM frequency conversion control circuit of 4 route metal-oxide-semiconductor switch compositions, for realizing semiconductor chilling plate frequency conversion control;
Cooling fan control circuit is the cooling fan PWM frequency conversion control circuit of 2 route metal-oxide-semiconductor switch compositions, for realizing the cooling fan blast velocity control of antistaling box;
Refrigeration fan control circuit is the cold junction blower fan PWM frequency conversion control circuit of 1 route metal-oxide-semiconductor switch composition, for realizing the cold junction blower fan blast velocity control of antistaling box;
Water pump control circuit, is the water pump P WM frequency conversion control circuit of 1 route metal-oxide-semiconductor switch composition, controls for the hot junction pump capacity realizing antistaling box;
Display drive circuit is industrial serial ports touch control screen driving circuit, for realizing screen and ARM control chip communication and control;
Cue circuit, controls warning light and buzzer phone for realizing, and then realizes mode of operation, information warning prompting;
Key control circuit is three road button driving circuits, realizes bright screen respectively, trouble back tone is eliminated, reset function;
Power-switching circuit, for ARM, ADC, actuating unit are powered.
Described control system flow process is create new thread after start program, enters ADC thread and obtains temperature information, each parts operating mode; Enter temperature and control thread, control actuating unit, regulating and controlling temperature; Enter serial ports and send thread, shield with serial ports and carry out information exchange; Data are pressed into hair style list thread; Enter SHT humidity sensor thread, obtain relative humidity information, form circulation;
Described temperature controls thread and judges that control object is the temperature inside the box or cold junction temperature; Semiconductor chilling plate carries out PID control; Water pump carries out PID control; Hot-side temperature and ambient temperature differences carry out classification, determine cooling fan wind speed scale; Go control object and the classification of target temperature difference, draw cold junction classification wind speed scale parameter; Before and after in case, temperature gap analysis, draws cold junction classification wind speed scale parameter; Contrast classification level parameter, chooses high wind speed grade; According to water pump, cooling fan, the cold junction blower fan of state modulator antistaling box;
Described control system touch-screen controls, and refers to 3 interfaces of set-up of control system, is acquiescence control inerface, automatically control inerface, manual control interface respectively; Described acquiescence control inerface, provides and shows conventional fruit vegetables storing parameter, and user directly can select required storing fruits and vegetables at this interface, automated system operation carries out fresh-keeping; Described automatic control inerface, user can select according to the needs of oneself control temperature of wanting, system can automatically be run control and carry out fresh-keeping, and control user temperature required, relative humidity in mean temperature in case, ambient temperature, case, transport total time and semiconductor chilling plate, water pump, cooling fan, refrigeration fan mode of operation can also be observed in interface; Described manual control interface can adjust semiconductor chilling plate, water pump, cooling fan, cold junction blower fan mode of operation, can also observe relative humidity in mean temperature in case, ambient temperature, case, transport total time and semiconductor chilling plate, water pump, cooling fan, refrigeration fan mode of operation in interface simultaneously;
Described temperature control Object Selection, refer to that in detection case, temperature averages and target temperature differ by more than 1 DEG C, semiconductor chilling plate PID controls with the temperature inside the box aviation value as control object, when the temperature difference is less than 1 DEG C, it is control object that semiconductor chilling plate PID controls with cold junction temperature, thus reduces because the time lag of the temperature inside the box regulation and control causes temperature to control overshoot;
Described semiconductor chilling plate PID controls, and refers in process of refrigerastion, and systems axiol-ogy the temperature inside the box or cold junction temperature carry out PID frequency conversion control, according to control object and the temperature inside the box difference, adopts pid algorithm to control semiconductor chilling plate and to power PWM frequency;
Described water pump P ID controls, and refer in process of refrigerastion, systems axiol-ogy hot-side temperature and ambient temperature carry out PID regulation and control, according to hot-side temperature apart from ambient temperature difference, adopts pid algorithm to control water pump and to power PWM frequency;
Described cooling fan step control, refers in process of refrigerastion, and systems axiol-ogy hot-side temperature and ambient temperature carry out classification regulation and control, and hot-side temperature and ambient temperature differences are divided into 4 grades, and cooling fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level;
Described cold junction blower fan step control, refers in process of refrigerastion, systems axiol-ogy the temperature inside the box, cold junction temperature, asks cold junction temperature difference to carry out classification regulation and control, and cold junction temperature and the temperature inside the box difference are 4 grades, and cold junction blower fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level;
Before and after in described case, temperature detection controls, refer to temperature before and after in systems axiol-ogy case, evaluation the temperature inside the box field uniformity, but excessive temperature differentials, heal differential is divided into 4 grades, cold junction blower fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level, and front and back temperature detection controls to choose high wind speed level when conflicting with cold junction blower fan step control;
Described case humidity measuring ability, refer to relative humidity in detection case, relative humidity is pointed out by system interface, and when relative humidity is too low, buzzer phone will be pointed out;
Described alarm function, refers to when system exception or hot-side temperature is too high, the temperature inside the box is too low, and system will do alarm by buzzer phone.
Described temperature sensor transmission circuit, for temperature sensor pt100 transmission circuit, rear part temperature sensor and environment temperature sensor in anterior temperature sensor, case in the cold junction temperature sensor of antistaling box, hot-side temperature sensor, case are recorded position temperature, become through ADC and send, realize ARM control chip and collecting sensor signal.
Described cue circuit comprises LED warning light and buzzer phone drive amplification circuit.
Described power-switching circuit is Width funtion input change-over circuit, realize the 3.3V voltage needed for micro controller system work being antistaling box by the step-down of 8-58V vdc, and the 3.3V voltage needed for ADC, simultaneously by boosting or reduced output voltage 12V direct current (DC), the semiconductor chilling plate and other actuating unit that realize antistaling box are powered.
Described antistaling box is made up of rear part temperature sensor, environment temperature sensor, relative humidity sensor, water-cooled exchange head, water pipe, water-filled radiator, cooling fan, hot junction water pump, water tank in anterior temperature sensor, case in fresh-keeping casing, cold junction blower fan, cold junction radiating gill, semiconductor chilling plate, cold junction temperature sensor, hot-side temperature sensor, case.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, the present invention to choose in 5 temperature sensor monitors cold junction temperatures, hot-side temperature, case rear part temperature in anterior temperature, ambient temperature, case, improves casing working state monitoring accuracy, improves temperature control particularity.
2, the present invention take ARM as control chip, has higher work speed and expansibility energy, increases antistaling box function, strengthens antistaling box preservativity.
3, the present invention adopts metal-oxide-semiconductor switches structure to realize the frequency conversion control of semiconductor chilling plate, hot junction blower fan, water pump, cold junction blower fan.
4, the present invention's SHT15 humiture one digital sensor, realizes relative humidity monitoring in case.
5, the present invention adopts PID frequency conversion control to semiconductor chilling plate, reduces system overshoot, strengthens system stability, reduces energy consumption.
6, the present invention takes the mode of step control to cooling fan and cold junction blower fan, controls cold junction temperature and hot-side temperature, reduces system energy consumption further, transport economic specific property.
7, the present invention detects the front and back temperature difference and controls cold junction blower fan, and regulates and controls with the classification of cold junction blower fan, carries out processed, and emphasis improves fruits and vegetables transport quality, improves fruits and vegetables commodity value.
8, the present invention has warning function, avoids because system exception and damage parts cause the loss of transporting fruits and vegetables.
9, temperature adjusting of the present invention divides normal and fine setting pattern, reduces the impact of control object time lag system, improves precise control, reduces temperature overshoot in transport cases.
10, the present invention adopts real-time system program, carries out Multi-thread control, ensures efficient, accurately.
11, the present invention adopts temperature to control the accurate temperature of thread determination semiconductor chilling plate, water pump, cooling fan, cold junction blower fan.
Accompanying drawing explanation
Fig. 1 is the constructional drawing of water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box.
Fig. 2 is the block diagram of control system of the present invention.
Fig. 3 is the control structure block scheme of control system of the present invention.
Fig. 4 a is acquiescence control inerface figure of the present invention.
Fig. 4 b is automatic control inerface figure of the present invention.
Fig. 4 c is manual control interface figure of the present invention.
Fig. 5 is the control flow chart of control system of the present invention.
Fig. 6 is that the temperature of control system of the present invention controls process diagram of circuit.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described.
Frequency-changing control system described in the present embodiment, control object is the semiconductor refrigerating fruit/vegetable fresh-keeping box adopting water-cooling, described antistaling box exchanges 10 by rear part temperature sensor 7 in anterior temperature sensor 6, case in fresh-keeping casing 1, cold junction blower fan 2, cold junction radiating gill 3, semiconductor chilling plate 4, cold junction temperature sensor 5, hot-side temperature sensor (not shown in FIG.), case, environment temperature sensor 8, relative humidity sensor 9, water-cooled, water pipe 11, water-filled radiator 12, cooling fan 13, hot junction water pump 14, water tank 15 form, as shown in Figure 1.
As shown in Figures 2 to 6, described water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system, take ARM as control chip, realize the control of control system touch screen, temperature control Object Selection, semiconductor chilling plate PID control, water pump P ID control, cooling fan step control, cold junction blower fan step control, the temperature inside the box field detection control, case humidity measuring ability, alarm function setting according to control system flow process; It includes:
Temperature sensor transmission circuit, for temperature sensor pt100 transmission circuit, for gathering in the cold junction temperature of antistaling box, hot-side temperature, case rear part temperature and ambient temperature in anterior temperature, case, rear part temperature sensor and environment temperature sensor in anterior temperature sensor, case in the cold junction temperature sensor of antistaling box, hot-side temperature sensor, case are recorded position temperature signal, becoming send as voltage analog signal, pass to ADC, realize ARM control chip and collecting sensor signal;
Relative humidity sensor driving circuit, being SHT15 humiture one digital sensor driving circuit, for obtaining relative humidity information in case, realizing ARM control chip and sensor communication;
Semiconductor chilling plate control circuit is the semiconductor chilling plate PWM frequency conversion control circuit of 4 route metal-oxide-semiconductor switch compositions, for realizing semiconductor chilling plate frequency conversion control;
Cooling fan control circuit is the cooling fan PWM frequency conversion control circuit of 2 route metal-oxide-semiconductor switch compositions, for realizing the cooling fan blast velocity control of antistaling box;
Refrigeration fan control circuit is the cold junction blower fan PWM frequency conversion control circuit of 1 route metal-oxide-semiconductor switch composition, for realizing the cold junction blower fan blast velocity control of antistaling box;
Water pump control circuit, is the water pump P WM frequency conversion control circuit of 1 route metal-oxide-semiconductor switch composition, controls for the hot junction pump capacity realizing antistaling box;
Display drive circuit is industrial serial ports touch control screen driving circuit, for realizing screen and ARM control chip communication and control;
Cue circuit, comprises LED warning light and buzzer phone drive amplification circuit, controls warning light and buzzer phone for realizing, and then realizes mode of operation, information warning prompting;
Key control circuit is 3 road button driving circuits, realizes bright screen respectively, trouble back tone is eliminated, reset function;
Power-switching circuit, for Width funtion input change-over circuit, realize the 3.3V voltage needed for micro controller system work being antistaling box by the step-down of 8-58V vdc, and the 3.3V voltage needed for ADC, simultaneously by boosting or reduced output voltage 12V direct current (DC), the semiconductor chilling plate and other actuating unit that realize antistaling box are powered.
Described control system flow process is create new thread after start program, enters ADC thread and obtains temperature information, each parts operating mode; Enter temperature and control thread, control actuating unit, regulating and controlling temperature; Enter serial ports and send thread, shield with serial ports and carry out information exchange; Data are pressed into hair style list thread; Enter SHT humidity sensor thread, obtain relative humidity information, form circulation.
Described temperature controls thread and judges that control object is the temperature inside the box or cold junction temperature; Semiconductor chilling plate carries out PID control; Water pump carries out PID control; Hot-side temperature and ambient temperature differences carry out classification, determine cooling fan wind speed scale; Go control object and the classification of target temperature difference, draw cold junction classification wind speed scale parameter; Before and after in case, temperature gap analysis, draws cold junction classification wind speed scale parameter; Contrast classification level parameter, chooses high wind speed grade; According to water pump, cooling fan, the cold junction blower fan of state modulator antistaling box.
Described control system touch-screen controls, and refers to 3 interfaces of set-up of control system, is acquiescence control inerface, automatically control inerface, manual control interface respectively, as shown in Fig. 4 a to Fig. 4 c; Described acquiescence control inerface, provides and shows conventional fruit vegetables storing parameter, and user directly can select required storing fruits and vegetables at this interface, automated system operation carries out fresh-keeping; Described automatic control inerface, user can select according to the needs of oneself control temperature of wanting, system can automatically be run control and carry out fresh-keeping, and control user temperature required, relative humidity in mean temperature in case, ambient temperature, case, transport total time and semiconductor chilling plate, water pump, cooling fan, cold junction blower fan mode of operation can also be observed in interface; Described manual control interface can adjust semiconductor chilling plate, water pump, cooling fan, cold junction blower fan mode of operation, can also observe relative humidity in mean temperature in case, ambient temperature, case, transport total time and semiconductor chilling plate, water pump, cooling fan, cold junction blower fan mode of operation in interface simultaneously.
Described temperature control Object Selection, refer to that in detection case, temperature averages and target temperature differ by more than 1 DEG C, semiconductor chilling plate PID controls with the temperature inside the box aviation value as control object, when the temperature difference is less than 1 DEG C, it is control object that semiconductor chilling plate PID controls with cold junction temperature, thus reduces because the time lag of the temperature inside the box regulation and control causes temperature to control overshoot.
Described semiconductor chilling plate PID controls, refer in process of refrigerastion, systems axiol-ogy the temperature inside the box or cold junction temperature carry out PID frequency conversion control, control semiconductor chilling plate and to power dutycycle, according to control object and the temperature inside the box difference, adopt pid algorithm to control semiconductor chilling plate and to power PWM frequency.Reduce system overshoot, strengthen system stability, reduce energy consumption.
Described water pump P ID controls, and refer in process of refrigerastion, systems axiol-ogy hot-side temperature and ambient temperature carry out PID regulation and control, according to hot-side temperature apart from ambient temperature difference, adopts pid algorithm to control water pump and to power PWM frequency.
Described cooling fan step control, refers in process of refrigerastion, and systems axiol-ogy hot-side temperature and ambient temperature carry out classification regulation and control, and hot-side temperature and ambient temperature differences are divided into 4 grades, and cooling fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level.
Described cold junction blower fan step control, refers in process of refrigerastion, systems axiol-ogy the temperature inside the box, cold junction temperature, asks cold junction temperature difference to carry out classification regulation and control, and cold junction temperature and the temperature inside the box difference are 4 grades, and cold junction blower fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level.
Before and after in described case, temperature detection controls, refer to temperature before and after in systems axiol-ogy case, evaluation the temperature inside the box field uniformity, but excessive temperature differentials, heal differential is divided into 4 grades, cold junction blower fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level, and front and back temperature detection controls to choose higher wind level when conflicting with cold junction blower fan step control.
Described case humidity measuring ability, refer to relative humidity in detection case, relative humidity is pointed out by system interface, and when relative humidity is too low, buzzer phone will be pointed out.
Described alarm function, refers to when system exception or hot-side temperature is too high, the temperature inside the box is too low, and system will do alarm by buzzer phone.
In sum, instant invention overcomes existing semiconductor refrigerating antistaling box control system and control the shortcomings such as extensive, energy consumption is high, temperature overshoot is large, the temperature difference is large.Need to be optimized according to antistaling box, by multi way temperature sensor, and pwm control circuit achieves semiconductor chilling plate, water pump P ID controls, blower fan blast velocity control, and control object is selected, the functions such as front and back temperature difference adjustment; Improve control system intelligence degree, improve antistaling box work efficiency, reduce energy consumption, improve temperature field regulation and control, ensure fruit-vegetable quality, be applicable to the storing of various preserving fruit and vegetable utilizing, be worthy to be popularized.
The examples of implementation of the above are only the preferred embodiment of the present invention, not limit practical range of the present invention with this, therefore the change that all shapes according to the present invention, principle are done, all should be encompassed in protection scope of the present invention.
Claims (6)
1. a water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system, it is characterized in that, take ARM as control chip, realize the control of control system touch screen, temperature control Object Selection, semiconductor chilling plate PID control, water pump P ID control, cooling fan step control, cold junction blower fan step control, the temperature inside the box field detection control, case humidity measuring ability, alarm function setting according to control system flow process; Include:
Temperature sensor transmission circuit, for gathering in the cold junction temperature of antistaling box, hot-side temperature, case rear part temperature and ambient temperature signal in anterior temperature, case, become and send as voltage analog signal, pass to ADC, realize ARM control chip and collecting sensor signal;
Relative humidity sensor driving circuit, being SHT15 humiture one digital sensor driving circuit, for obtaining relative humidity information in case, realizing ARM control chip and sensor communication;
Semiconductor chilling plate control circuit is the semiconductor chilling plate PWM frequency conversion control circuit of 4 route metal-oxide-semiconductor switch compositions, for realizing semiconductor chilling plate frequency conversion control;
Cooling fan control circuit is the cooling fan PWM frequency conversion control circuit of 2 route metal-oxide-semiconductor switch compositions, for realizing the cooling fan blast velocity control of antistaling box;
Refrigeration fan control circuit is the cold junction blower fan PWM frequency conversion control circuit of 1 route metal-oxide-semiconductor switch composition, for realizing the cold junction blower fan blast velocity control of antistaling box;
Water pump control circuit, is the water pump P WM frequency conversion control circuit of 1 route metal-oxide-semiconductor switch composition, controls for the hot junction pump capacity realizing antistaling box;
Display drive circuit is industrial serial ports touch control screen driving circuit, for realizing screen and ARM control chip communication and control;
Cue circuit, controls warning light and buzzer phone for realizing, and then realizes mode of operation, information warning prompting;
Key control circuit is 3 road button driving circuits, realizes bright screen respectively, trouble back tone is eliminated, reset function;
Power-switching circuit, for ARM, ADC, actuating unit are powered.
2. a kind of water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system according to claim 1, is characterized in that: described control system flow process is create new thread after start program, enters ADC thread and obtains temperature information, each parts operating mode; Enter temperature and control thread, control actuating unit, regulating and controlling temperature; Enter serial ports and send thread, shield with serial ports and carry out information exchange; Data are pressed into hair style list thread; Enter SHT humidity sensor thread, obtain relative humidity information, form circulation;
Described temperature controls thread and judges that control object is the temperature inside the box or cold junction temperature; Semiconductor chilling plate carries out PID control; Water pump carries out PID control; Hot-side temperature and ambient temperature differences carry out classification, determine cooling fan wind speed scale; Go control object and the classification of target temperature difference, draw cold junction classification wind speed scale parameter; Before and after in case, temperature gap analysis, draws cold junction classification wind speed scale parameter; Contrast classification level parameter, chooses high wind speed grade; According to water pump, cooling fan, the cold junction blower fan of state modulator antistaling box;
Described control system touch-screen controls, and refers to 3 interfaces of set-up of control system, is acquiescence control inerface, automatically control inerface, manual control interface respectively; Described acquiescence control inerface, provides and shows conventional fruit vegetables storing parameter, and user directly can select required storing fruits and vegetables at this interface, automated system operation carries out fresh-keeping; Described automatic control inerface, user can select according to the needs of oneself control temperature of wanting, system can automatically be run control and carry out fresh-keeping, and control user temperature required, relative humidity in mean temperature in case, ambient temperature, case, transport total time and semiconductor chilling plate, water pump, cooling fan, refrigeration fan mode of operation can also be observed in interface; Described manual control interface can adjust semiconductor chilling plate, water pump, cooling fan, cold junction blower fan mode of operation, can also observe relative humidity in mean temperature in case, ambient temperature, case, transport total time and semiconductor chilling plate, water pump, cooling fan, refrigeration fan mode of operation in interface simultaneously;
Described temperature control Object Selection, refer to that in detection case, temperature averages and target temperature differ by more than 1 DEG C, semiconductor chilling plate PID controls with the temperature inside the box aviation value as control object, when the temperature difference is less than 1 DEG C, it is control object that semiconductor chilling plate PID controls with cold junction temperature, thus reduces because the time lag of the temperature inside the box regulation and control causes temperature to control overshoot;
Described semiconductor chilling plate PID controls, and refers in process of refrigerastion, and systems axiol-ogy the temperature inside the box or cold junction temperature carry out PID frequency conversion control, according to control object and the temperature inside the box difference, adopts pid algorithm to control semiconductor chilling plate and to power PWM frequency;
Described water pump P ID controls, and refer in process of refrigerastion, systems axiol-ogy hot-side temperature and ambient temperature carry out PID regulation and control, according to hot-side temperature apart from ambient temperature difference, adopts pid algorithm to control water pump and to power PWM frequency;
Described cooling fan step control, refers in process of refrigerastion, and systems axiol-ogy hot-side temperature and ambient temperature carry out classification regulation and control, and hot-side temperature and ambient temperature differences are divided into 4 grades, and cooling fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level;
Described cold junction blower fan step control, refers in process of refrigerastion, systems axiol-ogy the temperature inside the box, cold junction temperature, asks cold junction temperature difference to carry out classification regulation and control, and cold junction temperature and the temperature inside the box difference are 4 grades, and cold junction blower fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level;
Before and after in described case, temperature detection controls, refer to temperature before and after in systems axiol-ogy case, evaluation the temperature inside the box field uniformity, but excessive temperature differentials, heal differential is divided into 4 grades, cold junction blower fan wind speed is divided into 4 grades, the corresponding wind speed of corresponding temperature difference level, and front and back temperature detection controls to choose high wind speed level when conflicting with cold junction blower fan step control;
Described case humidity measuring ability, refer to relative humidity in detection case, relative humidity is pointed out by system interface, and when relative humidity is too low, buzzer phone will be pointed out;
Described alarm function, refers to when system exception or hot-side temperature is too high, the temperature inside the box is too low, and system will do alarm by buzzer phone.
3. a kind of water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system according to claim 1, it is characterized in that: described temperature sensor transmission circuit, for temperature sensor pt100 transmission circuit, rear part temperature sensor and environment temperature sensor in anterior temperature sensor, case in the cold junction temperature sensor of antistaling box, hot-side temperature sensor, case are recorded position temperature, become through ADC and send, realize ARM control chip and collecting sensor signal.
4. a kind of water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system according to claim 1, is characterized in that: described cue circuit comprises LED warning light and buzzer phone drive amplification circuit.
5. a kind of water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system according to claim 1, it is characterized in that: described power-switching circuit is Width funtion input change-over circuit, realize the 3.3V voltage needed for micro controller system work being antistaling box by the step-down of 8-58V vdc, and the 3.3V voltage needed for ADC, simultaneously by boosting or reduced output voltage 12V direct current (DC), the semiconductor chilling plate and other actuating unit that realize antistaling box are powered.
6. a kind of water cooled semiconductor refrigerating fruit/vegetable fresh-keeping box frequency-changing control system according to claim 1, is characterized in that: described antistaling box is made up of rear part temperature sensor, environment temperature sensor, relative humidity sensor, water-cooled exchange head, water pipe, water-filled radiator, cooling fan, hot junction water pump, water tank in anterior temperature sensor, case in fresh-keeping casing, cold junction blower fan, cold junction radiating gill, semiconductor chilling plate, cold junction temperature sensor, hot-side temperature sensor, case.
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| CN108549211A (en) * | 2018-04-26 | 2018-09-18 | 华侨大学 | A kind of Fractional Order PID Controller design method of time lag system |
| CN109885115A (en) * | 2019-01-21 | 2019-06-14 | 宁波大红鹰学院 | One kind intelligent antistaling box control system Internet-based and method |
| CN110068197A (en) * | 2019-05-22 | 2019-07-30 | 江南大学 | A kind of solar powered semiconductor refrigerating temperature control antistaling box |
| CN110221635A (en) * | 2019-05-17 | 2019-09-10 | 合肥市正捷智能科技有限公司 | A kind of condition test-control method and condition test-control device |
| WO2020001523A1 (en) * | 2018-06-29 | 2020-01-02 | 京东方科技集团股份有限公司 | Temperature control method and temperature control device |
| CN110836559A (en) * | 2019-12-27 | 2020-02-25 | 王博良 | Method for controlling semiconductor refrigerating sheet |
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| US11485195B2 (en) | 2018-06-29 | 2022-11-01 | Beijing Boe Technology Development Co., Ltd. | Temperature control method and temperature control device |
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| CN110221635A (en) * | 2019-05-17 | 2019-09-10 | 合肥市正捷智能科技有限公司 | A kind of condition test-control method and condition test-control device |
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