CN104824128B - Control circuit of miniature vegetable dehydrator - Google Patents
Control circuit of miniature vegetable dehydrator Download PDFInfo
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- CN104824128B CN104824128B CN201510188675.8A CN201510188675A CN104824128B CN 104824128 B CN104824128 B CN 104824128B CN 201510188675 A CN201510188675 A CN 201510188675A CN 104824128 B CN104824128 B CN 104824128B
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- 235000013311 vegetables Nutrition 0.000 title claims abstract description 42
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 20
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 230000018044 dehydration Effects 0.000 description 14
- 238000006297 dehydration reaction Methods 0.000 description 14
- 238000000034 method Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 235000013305 food Nutrition 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 235000021168 barbecue Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 235000013580 sausages Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
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- Control Of Temperature (AREA)
Abstract
The invention discloses a control circuit of a miniature vegetable dehydrator, which comprises an external switch circuit of an electric oven, a triode switch circuit, a temperature feedback circuit and a temperature adjusting circuit, wherein the external switch circuit of the electric oven consists of a bidirectional thyristor and an optocoupler and is used as an alternating current switch of the electric oven; the triode switching circuit comprises a triode and a voltage comparator, and provides driving current for a light emitting tube of the optocoupler when a collector and an emitter of the triode are conducted; the temperature feedback circuit converts the temperature value into a corresponding voltage signal to be used as a comparison voltage of the voltage comparator; the temperature adjusting circuit can control the size of the reference voltage by adjusting the potentiometer, thereby indirectly achieving the purpose of temperature adjustment. This circuit structure is simple, low cost, easy to carry out, and it can reform transform into economical and practical, the energy consumption is lower, be fit for the miniature dehydrated vegetable machine that the family used with more common domestic electric oven to satisfy domestic vegetable dewatering device's market vacancy, and then have important meaning.
Description
Technical Field
The invention relates to a control circuit, in particular to a control circuit capable of modifying an oven into a miniature vegetable dehydrator.
Background
The dehydrated vegetable is prepared by washing and drying fresh vegetables and removing most of moisture in the vegetables, so that the dehydrated vegetable is easier to store, transport and carry under the condition of keeping the original color and nutrient components of the vegetables, and is a common treatment mode for the vegetables. Most of the existing vegetable dewatering devices are industrial equipment, so that the power is high, the device is heavy, the purchase cost is high, and the device is suitable for industrial processing and is not suitable for being used in ordinary families. In recent years, people's health consciousness is increasing, but food safety problems occur frequently, people prefer to treat food materials in person, and therefore miniature vegetable dehydration equipment suitable for household use has wide market demands.
The electric oven is one of the household electric appliances, is commonly used for baking bread, barbecue, grilled fish, roasted sausage and other foods, generally has a temperature adjusting function and a timing function, but the temperature control range is more than 100 ℃ and 250 ℃, and cannot meet the low-temperature drying requirement of dehydrated vegetables. If the control device matched with the electric oven is provided, the control device and the electric oven can be used as a miniature vegetable dehydrator in a matching way, so that the cost for purchasing the miniature vegetable dehydrator by people can be saved, the utilization rate of a purchased electric appliance is improved, and the control device has important significance.
Disclosure of Invention
The invention aims to provide a miniature vegetable dehydrator control circuit which is simple in circuit, low in cost and easy to implement, and has a function of manufacturing dehydrated vegetables when being matched with an electric oven for use.
In order to achieve the technical purpose, the invention adopts the following technical scheme: a miniature vegetable dehydrator control circuit comprising:
the external switch circuit of the electric oven is composed of a bidirectional thyristor and an optocoupler, the bidirectional thyristor is connected to a power line of the electric oven and serves as an alternating current switch of the electric oven, and a photoresistor of the optocoupler is connected with the bidirectional thyristor to form a trigger circuit which is used for providing trigger current for the bidirectional thyristor;
the triode switching circuit comprises a triode and a voltage comparator, wherein a collector of the triode is connected with a power supply, an emitter of the triode is connected with a light emitting tube of the optocoupler, an output end of the voltage comparator is connected with a base electrode of the triode, the triode is switched on when the voltage comparator outputs a high level, the triode is switched off when the voltage comparator outputs a low level, and the triode is switched on to provide driving current for the light emitting tube of the optocoupler;
the temperature feedback circuit comprises a temperature sensor formed by connecting N diodes in series, the positive end of the temperature sensor is connected with a power supply through a current-limiting resistor, the negative end of the temperature sensor is grounded, the positive end of the temperature sensor is connected with the non-inverting input end of the voltage comparator, the temperature sensor has different voltage drops at different temperatures, namely the temperature feedback circuit converts the temperature value into a corresponding voltage signal to be used as the comparison voltage of the voltage comparator;
the temperature adjusting circuit comprises a potentiometer with two fixed ends connected in a loop, a sliding contact of the potentiometer is connected with the inverting input end of a voltage comparator, the voltage at the sliding contact is used as the reference voltage of the voltage comparator, the reference voltage can be controlled by adjusting the potentiometer, and the purpose of adjusting the temperature indirectly is achieved.
The working principle of the invention is as follows: when the miniature vegetable dehydrator control circuit is manufactured, the temperature control range is easily set within the temperature range required by a vegetable dehydration process, such as 0-100 ℃, by matching the parameters of all elements in the temperature feedback circuit and the temperature adjusting circuit. When the temperature sensor is used, the temperature sensor is placed in the electric oven, the electric oven is connected with a mains supply through an external switch circuit of the electric oven, the dehydration temperature is preset at a certain numerical value of 0-100 ℃ by adjusting a potentiometer in the temperature adjusting circuit, the voltage comparator obtains a reference voltage corresponding to the temperature at the moment, and then a power supply of the electric oven is started; because the initial temperature in the electric oven is lower than the set temperature, namely the comparison voltage provided by the temperature feedback circuit for the voltage comparator is higher than the reference voltage provided by the temperature regulation circuit for the voltage comparator, the voltage comparator outputs high potential at the moment, a triode in the triode switch circuit is in a conducting state, the optocoupler is in a conducting state by providing driving current for the triode switch circuit, namely the bidirectional thyristor connects the electric oven with the mains supply, and the electric oven enters a working state; the voltage drop of the temperature sensor is gradually reduced along with the gradual rise of the internal temperature of the electric oven, when the comparison voltage provided by the temperature feedback circuit for the voltage comparator is smaller than the reference voltage provided by the temperature adjusting circuit for the voltage comparator, the voltage comparator outputs a low potential, at the moment, the triode in the triode switch circuit is switched to a cut-off state, the optocoupler cannot obtain driving current and is in the cut-off state, the bidirectional thyristor is in the cut-off state, the electric oven stops working, and therefore the electric oven is heated in a reciprocating mode, the temperature in the electric oven is always the preset temperature, and the processing requirement of low-temperature drying of dehydrated vegetables is met.
The invention has the following beneficial effects: this circuit structure is simple, low cost, easy to carry out, and it can reform transform into economical and practical, the energy consumption is lower, be fit for the miniature dehydrated vegetable machine that the family used with more common domestic electric oven to satisfy domestic vegetable dewatering device's market vacancy, and then have important meaning. The circuit can be directly welded in the electric oven, and the electric oven is completely modified into a miniature vegetable dehydrator; the circuit can also integrate an independent control device to be combined with the electric oven for use, thereby keeping the original functions of the electric oven and further improving the functionality of the electric oven.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Detailed Description
As shown in fig. 1, the control circuit for a miniature vegetable dehydrator disclosed by the present invention comprises an external switch circuit of an electric oven, a triode switch circuit, a voltage comparator, a temperature feedback circuit and a temperature adjusting circuit.
The external switch circuit of the electric oven consists of a bidirectional thyristor JZ and an optocoupler Rcds, and the T of the bidirectional thyristor JZ 1 Pole, T 2 Is connected with the electric oven in an electrode wayWhen the optocoupler Rcds has driving conditions, the resistance value of the photoresistor becomes very small, and trigger current can be provided for the bidirectional thyristor JZ, so that the electric oven is communicated with a mains supply to work, and otherwise, the electric oven stops working.
The triode switch circuit comprises a triode T and a voltage comparator A, wherein a collector of the triode T is connected with a power supply, an emitter of the triode T is connected with a light emitting tube of the optocoupler Rcds, an output end of the voltage comparator A is connected with a base electrode of the triode T, the triode T is conducted when the voltage comparator A outputs a high level, and the triode T is cut off when the voltage comparator A outputs a low level; and when the triode T is conducted, the driving current is provided for the luminotron of the optocoupler.
The temperature feedback circuit comprises a temperature sensor WDCGQ formed by connecting N diodes in series, the positive pole end of the temperature sensor WDCGQ is connected with a power supply through a current-limiting resistor R1, the negative pole end of the temperature sensor WDCGQ is grounded, the positive pole end of the temperature sensor WDCGQ is connected with the non-inverting input end of the voltage comparator A, the temperature sensor WDCGQ has different voltage drops at different temperatures, and the voltage value at the positive pole end, namely A1, of the temperature sensor WDCGQ is the voltage drop of the temperature sensor WDCGQ, namely the temperature feedback circuit converts the temperature value into a corresponding voltage signal to be used as the comparison voltage of the voltage comparator A.
The temperature adjusting circuit comprises a potentiometer RP2 with two fixed ends connected in a loop, a sliding contact of the potentiometer RP2 is connected with the inverting input end of a voltage comparator A, the voltage at the sliding contact, namely A2, is used as the reference voltage of the voltage comparator A, the reference voltage can be controlled by adjusting the potentiometer RP2, and the purpose of adjusting the temperature indirectly is achieved.
The working principle of the invention is as follows: when the miniature vegetable dehydrator control circuit is manufactured, the temperature control range is easily set within the temperature range required by a vegetable dehydration process, such as 0-100 ℃, by matching the parameters of all elements in the temperature feedback circuit and the temperature adjusting circuit. When the temperature sensor WDCGQ is used, the temperature sensor WDCGQ is placed in the electric oven, a power line of the electric oven is connected into an external switch circuit of the electric oven, the potentiometer in the temperature adjusting circuit is adjusted, so that the dehydration temperature is preset to a certain value of 0-100 ℃, the voltage comparator A obtains a reference voltage corresponding to the temperature, and then the original power supply of the electric oven is started; because the initial temperature in the electric oven is lower than the set temperature, namely the comparison voltage provided by the temperature feedback circuit for the voltage comparator A is higher than the reference voltage provided by the temperature regulating circuit for the voltage comparator, the voltage comparator outputs high potential at the moment, a triode T in the triode switch circuit is in a conducting state, the optocoupler Rcds is in a conducting state by providing driving current for the triode switch circuit, namely the bidirectional thyristor JZ connects a heating element of the electric oven with a power supply line, and the electric oven enters a working state; the voltage drop of the temperature sensor WDCGQ is gradually reduced along with the gradual rise of the internal temperature of the electric oven, when the comparison voltage provided by the temperature feedback circuit for the voltage comparator A is smaller than the reference voltage provided by the temperature regulating circuit for the voltage comparator A, the voltage comparator A outputs a low potential, the triode T in the triode switch circuit is switched to a cut-off state at the moment, the optocoupler Rcds can not obtain driving current and is in the cut-off state, the bidirectional thyristor JZ is in the cut-off state, and the electric oven stops working, so that the electric heating element works in a reciprocating manner, the temperature in the electric oven is always the preset temperature, and the processing requirement of low-temperature drying of dehydrated vegetables is met.
Example 1
The invention is further explained by taking the modification of the existing product-the North America electric oven as an example:
(1) the temperature control range of the electric oven is 100-250 ℃, the vegetable dehydration process needs to be carried out at a lower temperature of tens of ℃, the dehydrated vegetables cannot be baked by the electric oven before modification, and the temperature control range needs to be modified so as to be adjustable within the range of 0-100 ℃.
(2) The time adjustment range of the electric oven is 0-60 minutes, the vegetable dehydration time is generally several hours, but in the test process, the dehydrated vegetables need to be overturned for many times in the vegetable dehydration process to be uniformly dehydrated, so that an original time controller can be utilized, the electric oven is automatically stopped after one hour of dehydration, the vegetables can be overturned by the aid of the automatic time controller, the next working time is reset, the vegetable dehydration operation is not influenced, and the original design can be kept unchanged.
(3) After examining the heater and temperature controller of the electric oven, the electric heating element is composed of 4 cylindrical resistors.
Therefore, the electric oven is reformed, the working temperature of the electric oven can be adjusted within 0-100 ℃, and the vegetable dehydration operation can be normally carried out.
T of bidirectional thyristor JZ in control circuit of miniature vegetable dehydrator 1 Pole, T 2 The temperature sensor WDCGQ is fixed in the oven after other circuit elements are connected according to the scheme; assuming that the temperature required by the vegetable dehydration process is t, adjusting the resistance value of the current-limiting resistor R1 to make the current flowing through the temperature sensor WDCGQ be 0.1 milliampere, measuring the positive end of the temperature sensor WDCGQ, namely A1 point-to-ground voltage, finding that VA1 millivolts, and setting the temperature in the electric oven to be t1, the temperature which needs to be increased by the column resistor during dehydration operation is (t-t1), the temperature sensor WDCGQ is formed by connecting N diodes in series, and the voltage drop of a single diode is about 2 millivolts when the temperature rises by 1 ℃, so when the temperature rises by (t-t1), the voltage drop of the CGWDQ of the temperature sensor is: VA1-N (t-t1) 2 mv, so adjust potentiometer RP2 to make a2 point-to-ground voltage, i.e. the reference voltage input by voltage comparator a, equal to: VA1-N (t-t1) 2 mv; when the temperature in the electric oven is lower than T, the comparison voltage input by the non-inverting input end of the voltage comparator A is higher than the reference voltage input by the inverting input end (VA1-N (T-T1) 2 mV), the voltage comparator A outputs high potential, the triode T is conducted, the light emitting tube of the optical coupler is conducted, the light emitting tube is conducted, the resistance value of the photoresistor of the optical coupler is very small, and therefore trigger current is provided for the bidirectional thyristor JZ, the cylindrical resistor used for heating is communicated with the power circuit by the bidirectional thyristor JZ, and the cylindrical resistor gives out heat to raise the temperature in the electric oven; when the temperature in the electric oven is higher than T, the comparison voltage input by the non-inverting input end of the voltage comparator A is lower than the reference voltage (VA1-N (T-T1) 2 mV) input by the inverting input end, the voltage comparator A outputs a low potential, the triode T is cut off, the light-emitting tube of the optical coupler is extinguished, and the light-emitting tube of the optical coupler is extinguished, so that the temperature in the electric oven is higher than TThe resistance value of the photosensitive resistor of the optocoupler is increased, the bidirectional thyristor JZ is switched from on to off, and the electric oven stops working; therefore, the temperature in the electric oven can be ensured to be t all the time, and the temperature requirement required by vegetable dehydration is met.
Claims (1)
1. A miniature vegetable dehydrator control circuit, comprising:
the external switch circuit of the electric oven is composed of a bidirectional thyristor and an optocoupler; the T1 pole and the T2 pole of the bidirectional thyristor are connected to a power line of the electric oven and are used as an alternating current switch of the electric oven; the G pole of the bidirectional thyristor is connected with a power supply line through a photoresistor of the optocoupler to form a trigger circuit which is used for providing trigger current for the bidirectional thyristor;
the triode switching circuit comprises a triode and a voltage comparator, wherein a collector of the triode is connected with a power supply, an emitter of the triode is connected with a light emitting tube of the optocoupler, an output end of the voltage comparator is connected with a base electrode of the triode, the triode is switched on when the voltage comparator outputs a high level, the triode is switched off when the voltage comparator outputs a low level, and the triode is switched on to provide driving current for the light emitting tube of the optocoupler;
the temperature feedback circuit comprises a temperature sensor formed by connecting N diodes in series, the positive end of the temperature sensor is connected with a power supply through a current-limiting resistor, the negative end of the temperature sensor is grounded, the positive end of the temperature sensor is connected with the non-inverting input end of the voltage comparator, the temperature sensor has different voltage drops at different temperatures, namely the temperature feedback circuit converts the temperature value into a corresponding voltage signal to be used as the comparison voltage of the voltage comparator;
the temperature adjusting circuit comprises a potentiometer with two fixed ends connected in a loop, a sliding contact of the potentiometer is connected with the inverting input end of a voltage comparator, the voltage at the sliding contact is used as the reference voltage of the voltage comparator, the reference voltage can be controlled by adjusting the potentiometer, and the purpose of adjusting the temperature indirectly is achieved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510188675.8A CN104824128B (en) | 2015-04-13 | 2015-04-13 | Control circuit of miniature vegetable dehydrator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510188675.8A CN104824128B (en) | 2015-04-13 | 2015-04-13 | Control circuit of miniature vegetable dehydrator |
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| CN104824128A CN104824128A (en) | 2015-08-12 |
| CN104824128B true CN104824128B (en) | 2022-08-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11125429A (en) * | 1997-10-22 | 1999-05-11 | Matsumoto Giken Kk | Electronic oven and its heating method |
| US5916353A (en) * | 1998-01-28 | 1999-06-29 | Maytag Corporation | Domestic oven adapted for use in dehydrating food products |
| CN2742481Y (en) * | 2004-11-17 | 2005-11-23 | 李翔 | Digital regulator for showering water temperature |
| CN202452797U (en) * | 2012-01-09 | 2012-09-26 | 朱午辰 | Intelligent drying and dewatering electric oven |
| CN202649750U (en) * | 2012-04-24 | 2013-01-02 | 南京师范大学 | Electric oven controller |
| CN204707882U (en) * | 2015-04-13 | 2015-10-21 | 李秋红 | Miniature size vegetable decanter control circuit |
-
2015
- 2015-04-13 CN CN201510188675.8A patent/CN104824128B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11125429A (en) * | 1997-10-22 | 1999-05-11 | Matsumoto Giken Kk | Electronic oven and its heating method |
| US5916353A (en) * | 1998-01-28 | 1999-06-29 | Maytag Corporation | Domestic oven adapted for use in dehydrating food products |
| CN2742481Y (en) * | 2004-11-17 | 2005-11-23 | 李翔 | Digital regulator for showering water temperature |
| CN202452797U (en) * | 2012-01-09 | 2012-09-26 | 朱午辰 | Intelligent drying and dewatering electric oven |
| CN202649750U (en) * | 2012-04-24 | 2013-01-02 | 南京师范大学 | Electric oven controller |
| CN204707882U (en) * | 2015-04-13 | 2015-10-21 | 李秋红 | Miniature size vegetable decanter control circuit |
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| CN104824128A (en) | 2015-08-12 |
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Granted publication date: 20220812 |