Abstract:
An electronically-frequency-controlled voltage adjustment device comprises a power supply for providing voltages to an object; a temperature sensor for sensing temperatures of the object; a temperature control unit receiving temperature signals from the temperature sensor and outputting temperature variation signals; a voltage adjustment unit for adjusting output voltages of the power supply based on the temperature variation signals from the temperature control unit; and a frequency generator for generating oscillating current intermittently. Furthermore, a method for unfreezing and retaining the freshness of foods is also provided. The method uses the electronically-frequency-controlled voltage adjustment device to various freezing device and fries device so as to retain the freshness of foods.

Description:
FIELD OF THE INVENTION  
       [0001]     The present invention relates to voltage adjustment devices, and in particular to an electronically-frequency-controlled voltage adjustment device which is used to retain the freshness of foods in unfreezing or frying. The present invention also relates to a method for retaining the freshness of foods by using the same.  
       BACKGROUND OF THE INVENTION  
       [0002]     Currently, technologies for retaining freshness of foods and unfreezing foods use electrostatic technology. In that, transformers are used to boost the voltages and then resistance at output end is limited. In unfreezing process, voltages are applied to the foods. However there is a big trouble in the unfreezing process, that is a very long time period is necessary, for example, 8 to 10 hours are necessary to unfreeze foods from −6° C. to −2° C. Not only time is consumed, but also power is wasted. Thereby the quality of the food is deteriorated in the unfreezing process.  
         [0003]     In U.S. Pat. No. 5,034,236A, a method for unfreezing food is provided, in that high voltage negative electrons are applied to foods. Then the foods can be unfroze at the temperature ranger of −3° C. to 3° C. However it also needs time period of 8 to 10 hours from publication documents or even a longer time period is necessary. Furthermore, the voltage in that method is unchanged, it is a fixed value.  
       SUMMARY OF THE INVENTION  
       [0004]     Accordingly, the primary object of the present invention is to provide an electronically-frequency-controlled voltage adjustment device which is used to retain the freshness of foods in unfreezing or fried. The present invention also relates to a method for retaining the freshness of foods by using the same.  
         [0005]     To achieve above objects, the present invention provides An electronically-frequency-controlled voltage adjustment device comprises a power supply for providing voltages to an object; a temperature sensor for sensing temperatures of the object; a temperature control unit receiving temperature signals from the temperature sensor and outputting temperature variation signals; a voltage adjustment unit for adjusting output voltages of the power supply based on the temperature variation signals from the temperature control unit; and a frequency generator for generating oscillating current intermittently.  
         [0006]     Furthermore, a method for unfreezing and retaining the freshness of foods is also provided. The method comprises the steps of: supply voltages by using a power supply; placing electrodes in an isolating space; providing the voltages to a food to be process through the electrodes from the power supply; sensing temperatures of the food by using a temperature sensor; receiving temperature signals from the temperature sensor and outputting temperature variation signals by using a temperature control unit; and adjusting the supply voltages based on the signals from the temperature control unit by using a voltage adjustment unit.  
         [0007]     The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing. 
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0008]      FIG. 1  shows the electronically-frequency-controlled voltage adjustment device of the present invention.  
         [0009]      FIG. 1-1  shows a schematic view about the principle of the present invention.  
         [0010]      FIG. 2  shows the box of the electronically-frequency-controlled voltage adjustment device of the present invention.  
         [0011]      FIG. 3  shows the bottom plate of the present invention.  
         [0012]      FIG. 4  shows a block diagram of the present invention.  
         [0013]      FIG. 5  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to a refrigerator.  
         [0014]      FIG. 6  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to a cake freezer.  
         [0015]      FIG. 7  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to a seafood freeze.  
         [0016]      FIG. 8  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to a juicy machine.  
         [0017]      FIG. 9  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to an unfreezing box.  
         [0018]      FIG. 10  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to an oven.  
         [0019]      FIG. 11  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to an open type refrigerator.  
         [0020]      FIG. 12  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to a freezer.  
         [0021]      FIG. 13  shows that the electronically-frequency-controlled voltage adjustment device of the present invention is applied to a fried machine. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0022]     In order that those skilled in the art can further understand the present invention, a description will be described in the following in details. However, these descriptions and the appended drawings are only used to cause those skilled in the art to understand the objects, features, and characteristics of the present invention, but not to be used to confine the scope and spirit of the present invention defined in the appended claims.  
         [0023]     With reference to  FIG. 1 , the electronically-frequency-controlled voltage adjustment device  20  of the present invention is illustrated. The present invention includes a high voltage transformer  10 , and a plurality of voltage selectors  11  connected to the high voltage transformer  10 ; a voltage output port  12  connected to all the voltage selectors  11 , and a temperature control unit  13  connected to all the voltage selectors  11  and a temperature sensor  14  connected the temperature control unit  13 . The temperature sensor  14  serves to transfer the temperature of a sensed object to the temperature control unit  13 . The temperature control unit  13  generates different voltages according to the temperature and the voltages are output from the voltage output port  12 . In the present invention, the voltages of 1000V, 2000V, 3000V and 4000V are used as an example, but other values between 100V to 5000V are permissible in the present invention.  
         [0024]     Referring to  FIG. 1-1 , a part of the feedback circuit is illustrated. When the temperature is changed, the value of the temperature sensor  14  will be feedback to the high voltage transformer  10 . The output is adjusted by the setting programmable parameter. When the load is changed, the voltage selectors  11  selects output voltage to the front high voltage transformer  10  to control the output of the setting voltage.  
         [0025]     In the prior art, the output voltage is fixed by the ratio of the first side coil to the secondary side coil, but in the present invention, when the input voltage is changed due to the variations of the temperature and load, the output voltage is also changed according to the predetermined program control logic without manual operation. The temperature control unit  13  and the voltage selectors  11  adjust the output voltage according to the temperature from the temperature sensor  14 . Thereby the unfreezing of food is based on an effective work curve.  
         [0026]      FIG. 2  shows the box of the electronically-frequency-controlled voltage adjustment device  20  according to the present invention.  
         [0027]     In  FIG. 2 , in one embodiment of the present invention, one side of the box of the electronically-frequency-controlled voltage adjustment device  20  is a first side current meter  21  for measuring input current, and another side of the box is a secondary side voltage meter  22  for outputting voltage after changed. The box also has a switch  23  for determining whether the frequency generator is used, a fault alarm  24 , and a power switch  25 .  
         [0028]      FIG. 2  show the bottom plate  30  of the electronically-frequency-controlled voltage adjustment device  20  of the present invention.  
         [0029]     In  FIG. 3 , the voltage providing unit  31  provides input voltage. Then a conductive electrode is placed in an insulating space. The high voltage is conductive to a center of a food to be processed. The temperature control and adjusting unit  32  transfers temperature signals to the voltage adjustment unit  33  based on the variation of the conductor temperature. Then the voltage adjustment unit  32  selectively adjusts the voltage values of the voltage providing unit  31 . Referring to  FIG. 4 , the frequency generator  40  has a delaying switch  41 , a programmable controller  42 , and a current oscillator  43 . When it is necessary to unfreeze quickly, the frequency generator  40  is actuated by a frequency selector. Then the delaying switch  41  controls the current oscillator  43  intermittently based on the programmable controller  42  so as to generate intermittent oscillating current. When it is necessary to retain the foods in a fresh state, the frequency generator  40  can be neglected.  
         [0030]      FIG. 5  shows one embodiment of the present invention, where the electronically-frequency-controlled voltage adjustment device  20  is used to a refrigerator.  
         [0031]     In  FIG. 5 , the outer sides of two inner wall of the refrigerator  50  are installed with conductive materials  52  and inner sides thereof are installed with wind nets  53 . A tray of the refrigerator is installed with conductive nets  54 . When the high voltage will cause that nitrogen generates from air. Since foods contain water which is a conductor, the whole food will form as electric carriers. Water molecules move dramatically in high voltage. The electrons in water molecules will ionize. Electrons in water molecules will be formed as covalent bonds to suppress the oxidization of water and generate of harmful materials.  
         [0032]      FIG. 6  shows that the electronically-frequency-controlled voltage adjustment device  20  of the present invention is applied to a cake freeze  60 .  
         [0033]     In  FIG. 6 , conductive material  61  is placed upon the cake freezer. Insulating material  63  is adjacent to the conductive material  62 . The foods to be processed are placed upon the insulating material  63 . Similarly, since the function of the high voltage will make air change so as to generate nitrogen. Since cakes contain water which is a conductor, the whole food will form as electric carriers. Water molecules move dramatically in high voltage. The electrons in water molecules will ionize. Electrons in water molecules will be formed as covalent bonds to suppress the oxidization of water and generate of harmful materials.  
         [0034]      FIG. 7  shows that the electronically-frequency-controlled voltage adjustment device  20  of the present invention is applied to a seafood freezer, it has the same effect as described in  FIG. 6 .  
         [0035]      FIG. 8  shows that the electronically-frequency-controlled voltage adjustment device  20  of the present invention is applied to a juicer.  
         [0036]     In  FIG. 8 , the electronically-frequency-controlled voltage adjustment device  20  is placed upon a container  80  for agitating juice. When conductor contacts with water, by the high voltage effect, since the function of the high voltage will make air change so as molecule moves dramatically in high voltage. The electrons in water molecules will ionize. Electrons in water molecules will be formed as covalent bonds. The water molecules become smaller so that they can be absorbed easily. This kind of juice can increase the permeability of germs to assist the excretion of heavy metal or harmful material from human bodies to the circulation of blood and increase immunity. Furthermore, high voltage causes water to ionize as oxide and hydrogen and cause part of oxygen as ozone which is a strong oxidizing agent so as to have the function of sterilization. Thereby the increment of oxygen has the effect of increase immunity. Besides the color of the juicy may retain to a fresh state. Thereby the juicy can retain with a long period.  
         [0037]      FIG. 9  shows that the electronically-frequency-controlled voltage adjustment device  20  of the present invention is applied to a refreezing box.  
         [0038]     In  FIG. 9 , the electronically-frequency-controlled voltage adjustment device  20  is connected to a web  91  of an unfreezing box  90 . The web  90  is isolated with an insulating device  92 . Furthermore, the food  93  on the web  91  has a high voltage. Thereby the foods to be unfreezed may be worked in an effect area of unfreezation so as to reduce the unfreezation time period and thus the food has a preferred quality.  
         [0039]      FIG. 10  shows that the electronically-frequency-controlled voltage adjustment device  20  of the present invention is applied to an oven.  
         [0040]     In  FIG. 10 , it is illustrated that the voltage of the electronically-frequency-controlled voltage adjustment device  20  is transferred to a web  101  which is insulated from a casing. The foods on the web have the high voltage. Conventionally, since in the conventionally oven, foods are roasted at the outer sides. It is possible that the outer side of the foods are burned black, but the center portion of the foods are retained in an un-roasted state. By the present invention, a large amount of electric charges are accumulated on the surface of food and structure of air is changed. Oxygen ions are separated and the surface of the food is coated with nitrogen so as to prevent from infection of germs. Thus the food is retained in fresh state and foul smell is removed.  
         [0041]      FIG. 11  shows that the electronically-frequency-controlled voltage adjustment device  20  of the present invention is used to an open type refrigerator.  
         [0042]     In  FIG. 11 , the open type refrigerator  110  has a conductive material  111  thereon. The conductive material  111  is connected with a conductive wire. The insulating material  112  is adjacent to the conductive material  111 . The foods to be processed are placed upon the conductive material  112 . In use of the device, when conductor contacts with water, by the high voltage effect, since the function of the high voltage will make air change, molecules move dramatically in high voltage. The electrons in water molecules will ionize. Electrons in water molecules will be formed as covalent bonds. When the high voltage causes that nitrogen generates from air, since foods contain water which is a conductor, the whole food will form as electric carriers. Water molecule moves dramatically in high voltage. The electrons in water molecules will ionize. Electrons in water molecules will be formed as covalent bonds to suppress the oxidization of water and generate of harmful materials so as to retain the food in fresh state.  
         [0043]      FIG. 12  shows that the electronically-frequency-controlled voltage adjustment device  20  of the present invention is applied to a freezer  120 .  
         [0044]     In  FIG. 12 , a control box is installed at an outer side of the freezer  120  When a cart formed of conductive material  121  and insulating wheels  122  enters into the freezer  120 , the carts carry foods to be froze. The high voltage of the control box will be applied to the foods. Since foods contain water which is a conductor, the whole food will form as electric carriers. Water molecule moves dramatically in high voltage. The electrons in water molecules will ionize. Electrons in water molecules will be formed as covalent bonds to suppress the oxidization of water and generate of harmful materials so as to retain the food in fresh state.  
         [0045]      FIG. 13  shows that the electronically-frequency-controlled voltage adjustment device  20  of the present invention is applied to a fried machine  130 .  
         [0046]     In  FIG. 13 , the fried machine  130  is installed with an electronically-frequency-controlled voltage adjustment device  20 . A oil tank  131  is conductive. Foods containing water is placed into oil. In fried process, heat is uniformly transferred into the food by induction. Thereby the fried process is speeded and the oil temperature can be reduced. It is impossible that the center portion is not heated. Thereby the color of the food is beautiful. Furthermore, water in food is ionized so that water molecules are conduced to have higher density. Thus, water is retained in the fried foods. Since micro current will transfer through the food, when the food is placed within electric field, it will isolate with oxygen. The greasy will not oxide and the lifetime of greasy will prolong. The small particles in the fried machine will precipitate. The grease will not become worse.  
         [0047]     The present invention is thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the present invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.